Determining the required TCPs and their frequency level of site inspections
The grades of TCP and their minimum frequency level of site inspections required for each functional stream for various types of building works or street works are set out in Table 1 of the Technical Memorandum. More frequent supervision requirements during critical stages are specified in paragraph 9 of this Code.
For building works with significant geotechnical content, the RSE would only be required to provide a team of site supervisors where there was structural works.
For foundation works in Scheduled Areas Nos. 1, 2 and 4 and in Designated Area of Northshore Lantau, additional supervision from the RGE’s stream is required on top of the supervision requirements for foundation works given in Table 1 of the Technical Memorandum. Note 5 to Table 1 of the Technical Memorandum refers.
Scale of the Works
The effect of the scale of the works should be considered in determination of supervision requirements. It shall be assessed by a scale factor of the works.
A measurable item and a basic value of which are assigned for each type of building works or street works. The scale factor of a type of works is the ratio of the estimated value of the measurable item of the works to the basic value. The scale factor is capped at 2.
The measurable items and their basic values to be used for the assessment of the scale factor of various types of building works or street works are set out in Table 8.1. Unless otherwise specified, the measurable items represent the total cost, average cost per month, or quantity of the respective type of building works or street works to be carried out. The BA may review and amend the measurable items and their basic values from time to time.
1 Building Works with Significant Geotechnical Content
Building works with significant geotechnical content include the following types of geotechnical works:
site formation
blasting
prestressed ground anchors
prestressed ground anchors in sensitive sites* (see para 7.3)
soil nails
cut slopes (in rock or soil) (height > 3 m)
stabilization works on rock slopes
fill slopes (compaction and installation of such surface filter/drainage layers) greater than 5 m high, or less than 5 m high which pose a direct risk to life, i.e. Consequence-to-life Category 1 or 2 in PNAP APP-109 (previously PNAP 234)
reinforced fill slopes
excavation and lateral support, and temporary retaining structures
depth > 4.5 m (depth > 7.5 m in sensitive sites* – see para 7.3)
permanent retaining structures
diaphragm walls and bored-pile walls
reinforced fill structures
cantilever / gravity retaining walls (height > 5 m) and screen/basement walls (height > 7.5m)
ground treatment
vertical drains, horizontal/raking drains
grouting and dewatering for cut and cover excavation and tunnel/shaft/cavern construction
ground water drainage works in Scheduled Area No. 1
demolition works affecting slopes and retaining walls
ground stabilization works using soil nails or anchors
foundation
foundation for buildings in Scheduled Area No. 1
deep foundation for buildings in Scheduled Areas Nos. 2 & 4 and in Designated Area of Northshore Lantau
foundation that could affect an existing tunnel/cavern or that could be affected by tunnel works
water wells
well yield test and the effect of proposed water extraction.
tunnel works* (tunnels/caverns/shafts/associated underground facilities – see para 7.3)
associated ground support, ground treatment and groundwater control works
The list above is not intended to be exhaustive as it only contains the common types of geotechnical works encountered.
In normal circumstances, a TCP T3 and a TCP T5 are required to be provided by the RGE to supervise building works with significant geotechnical content. However, a Directorate Site Supervisor (DSS) may be required for geotechnically difficult or sensitive sites marked * in the above list or any other sites as considered appropriate by GEO and BD.
Sensitive sites are sites where the works could pose adverse impact to life and/or property. These include sites where works could affect old buildings with shallow foundations, old tunnels/caverns, major roads, railways, water mains, gas mains, slopes, retaining walls or sites with history of instability.
The requirements for the provision of a DSS, if considered necessary by GEO and BD, will be conveyed to the AP/RSE/RGE in the approval and consent letters. The name of the DSS should also be given in the supervision plan.
A DSS should be a Registered Professional Engineer in geotechnical discipline who holds the position of a partner/director in the firm which prepared the geotechnical content of the submission. The RGE who is responsible for the project can also be accepted as the DSS.
Quality supervision of foundation works should be provided by the RSE and his TCP T5 and T3, as well as by the AS of the RSC and his TCP T4 and T2. Depending on the nature of the various stages of foundation works, TCPs should either be full-time on site or inspect certain percentage of the works as specified in this Code.
The stages of the various types of foundation works are shown in Table 6.3. Actual supervision requirements will be imposed by the BA at plan approval and consent stage on a case-by-case basis depending on the scale and extent of the foundation works.
Table 6.3Stages of Various Types of Foundation Works
Item No.
Stage
Description
F1
Driven Piles Setting out of piles
Check that the locations of piles agree with approved plans.
F2
(ii) Driving test
Check that design assumptions agree with actual site conditions during driving tests.
F3
(iii) Driving of piles
Check that the accepted working procedures of pile driving are followed and anomalies rectified during pile driving.
F4
(iv) Splicing of piles
Check the accuracy of design details during pile splicing.
F5
(v) Final sets
Check that the required final set has been achieved and the capacity of each pile complied with approved plans.
F6
(vi) Proof test (Verification on the performance of the as-constructed piles by the imposition of test load)
Check that the testing procedures and acceptance criteria of proof tests are in accordance with PNAP APP-18 (previously PNAP 66) and measurements are properly recorded during the test.
Table 6.3 Cont’d
F7
Large Diameter Bored Piles, Barrette Piles and the like Setting out of piles
Check that the locations of piles agree with approved plan.
F8
(ii) Pre-drilling (To determine the proposed founding levels of piles)
Supervise the pre-drilling operation; the logging of soil/rock samples, and to measure the depth of drillholes. Ensure that the retrieved samples are not tampered.
F9
(iii) Verification of founding stratum
Measure the depth of excavation and check the quality of retrieved materials at the founding stratum.
F10
(iv) Installation of piles (Grouting operation when required)
Check that proper working procedures of pile installation are followed and anomalies rectified. Check the correct grout mix, grout pressure and grout volume are being used and the adjacent building structures are not adversely affected.
F11
(v) Preparation of pile base
Ensure that pile base is clean.
F12
(vi) Fabrication and installation of rebar cage and placing of concrete
Check that sufficient and correct amount of rebars are provided and proper concreting method is used.
F13
(vii) Interface core-drilling
Check that the quality of concrete and foundation rock conforms with that specified in the approved plan and that concrete and rock are in good contact at the interface.
F14
(viii) Proof test (Verification on the performance of the as-constructed piles)
Supervise the core drilling operation of the proof test and the logging of concrete/rock samples and measure the depth of drillhole. Ensure that retrieved samples are securely stored and delivered to laboratory for testing.
F15
Mini-piles, Socketted H-piles and the like Setting out of piles
Check that the locations of piles agree with approved plan.
Table 6.3 Cont’d
F16
(ii) Pre-drilling (To determine the proposed founding levels of piles)
Supervise the pre-drilling operation; the logging of soil/rock samples, and to measure the depth of drillholes. Ensure that the retrieved samples are not tampered.
F17
(iii) Verification of founding stratum
Measure the depth of excavation and check the quality of retrieved materials at the founding stratum.
F18
(iv) Installation of piles (Grouting operation when required)
Check that proper working procedures of pile installation are followed and anomalies rectified. Check the correct grout mix, grout pressure and grout volume are being used and the adjacent building structures are not adversely affected.
F19
(v) Installation of rebar and grouting
Check that sufficient and correct amount of rebars are provided and proper grouting method is used.
F20
(vi) Proof test (Verification on the performance of the as-constructed piles by the imposition of test load)
Check that the testing procedure and acceptance criteria of the proof tests are in accordance with PNAP APP-18 (previously PNAP 66) and measurements are properly recorded during the test.
F21
(vii) Post-installation borehole drilling
Verify the rockhead profile and socket length of piles during post-installation borehole drilling.
F22
Rafts and Spread Footings Setting out of rafts and spread footings
Check that the locations and sizes of rafts and spread footings agree with approved plan (or the submitted plans for minor works).
F23
(ii) Inspection of bearing stratum
Check the compliance of ground bearing stratum with approved plans (or the submitted plans for minor works), site investigation reports and design assumptions.
F24
(iii) Fixing of rebars and checking of concrete covers
Check that sufficient amount of rebars and good workmanship are provided.
F25
(iv) Placing, compaction and curing of concrete
Ensure the quality and workmanship of concrete works.
F26
(v) Plate loading test (where required) (To verify the adequacy of ground bearing stratum)
Check that the accepted testing procedures of plate loading test are followed and measurements are correctly recorded.
Note : Foundation unit inspected should be shown in the checklist by each member of the supervision team.
The AP, RSE and RSC should jointly submit a supervision plan, specifying the name of the TCPs appointed and frequency of inspection and/or extent of supervision, and carry out inspections and supervisions in accordance with the plan. The plan should be submitted prior to or at the same time as consent application for the foundation works. However, no prior approval of the TCPs is required before commencement of the foundation works. The AP/RSE/RSC are responsible to ensure that their TCPs satisfy the qualification and experience requirements specified and should notify the BA of any subsequent changes of TCPs. The plan should be kept on site for the inspection of the BA when required.
The RSE should provide supervision as necessary during all stages in Table 6.3.
The AS of the RSC should provide supervision as necessary during all stages in Table 6.3.
Pre-drilling, interface core-drilling, post-installation drilling and proof test core-drilling for foundation works must be carried out by a Registered Specialist Contractor in the Ground Investigation Field Works category and be supervised by the site supervisors responsible for the quality supervision of foundation works. There is no need to submit a separate supervision plan for the pre-drilling and post-installation drilling works.
Quality supervision of soil nailing works should be provided by the RGE and his TCP T5 and T3, as well as by the AS of the RSC (Site Formation) and his TCP T4 and T1.
For all soil nailing works, at least one TCP T3 of the RGE and one TCP T1 of the RSC are required to be resident full-time on site during every stage of the works for each soil nail. The RSC is required to notify the RGE’s TCP T3 before the commencement of any stage of the works. The RSC is also required to prepare detailed inspection, measurement and testing records for each soil nail as per the approved plan requirements.
Table 6.2Stages of Soil Nailing Works
Item No.
Stage
Description
N1
Pull-out test and any specified site trial
Check whether the test nails are being constructed and the test/site trial procedure is in accordance with the approved plans or as specified by the RGE, and the acceptance criteria for the test/site trial are met.
N2
Setting out of soil nails
Check whether the positions of the soil nails agree with the approved plans.
N3
Drilling of soil nail holes
Check whether the drillhole diameter, length, inclination and bearing are in accordance with the approved plans and any anomalies on ground and groundwater conditions and to report to the responsible person if necessary.
Table 6.2 Cont’d
N4
Assembly of soil nail reinforcement
Check whether the assembly is in accordance with the approved plans, in particular, the length, type and corrosion protection provisions of the reinforcement, adequacy and tightness of any couplers used, adequacy of centralizers to ensure minimum grout cover and the grout pipes are not twisted and free from blockage and are extended to the bottom of the soil nail holes in accordance with the approved plans.
N5
Insertion of soil nail reinforcement
Check whether: cleaning of the hole, e.g. by air flushing is needed to remove any blockage or collapse, or there is any groundwater, which may require a change in construction method, andthe assembly is sufficiently rigid and the correct assembly of soil nail reinforcement is inserted.
N6
Grout and preparation of grout
Check whether the grout used, grout mix, preparation of grout and grout test results meet the requirements of the approved plans.
N7
Grouting of soil nail hole
Check whether: grouting of soil nails is carried out on the same day as insertion of the soil nail reinforcement assembly,grout is injected into the drillhole through the grout pipe with sustained grout return of satisfactory cleanliness and viscosity from the top of the drillhole,grouting operation is carried out according to the approved plans, andexcessive grouting time or excessive grout volume consumed in any drillhole to maintain sustained grout return of satisfactory cleanliness and viscosity, or other anomalies such as excessive ‘settlement’ of grout (as measured along the length of the nail) on cessation of grouting, are reported to the responsible person and recorded.
N8
Construction of soil nail heads and structural supports between nail heads
Check whether the soil nail heads and structural supports are constructed in accordance with approved plans, including the dimensions, materials used, structural detailing and workmanship.
Key records on supervision of soil nailing works (Appendix IX) should also be prepared and certified by the RGE’s TCP T3 who carries out the inspection, measurement or check. A full set of all certified records should be kept on site for the inspection by the BA.
The RGE’s TCP T5 personnel should verify the design assumptions and carry out design review during construction. He should check whether there are any anomalies that may invalidate the functional requirements of his design during his periodic site inspections and follow them up. He should also follow up any anomalies reported to him by the RGE’s TCP T3. If necessary, the RGE should make amendment submissions for the approval of the BA.
The extent of supervision required for different stages of soil nailing works is shown in Table 6.2. Actual supervision requirements will be imposed at plan approval stage by the BA on a case-by-case basis depending on the scale and complexity of the slope and the soil nailing works, and the anticipated construction difficulties. The RGE should nominate to the BA, an adequate number of qualified supervision personnel with suitable experience, taking into account the site conditions and the number of soil nails proposed and their lengths. During the construction stage, the RGE should review the adequacy of the supervision team taking into account the likelihood of concurrent construction requiring close supervision under the construction programme.
The RGE’s TCP T5 should provide supervision as necessary during all stages in Table 6.2. Moreover, he is required to provide the following supervision personally :
pull-out test and any specified site test – at least 1 nail each of pull-out test and site trial;
insertion of soil nail reinforcement – at least 2 working nails at early stage of nail construction;
grouting of soil nail hole – at least 2 working nails at early stage of nail construction; and
construction of soil nail heads and structural supports between nail heads – at least one soil nail head.
The RSC’s TCP T4 should also provide supervision as necessary during all stages in Table 6.2. Moreover, he is required to provide the following supervision personally :
pull-out test and any specified site test – at least 1 nail each of pull-out test and site trial;
insertion of soil nail reinforcement – at least 2 working nails at early stage of nail construction;
grouting of soil nail hole – at least 2 working nails at early stage of nail construction; and
construction of soil nail heads and structural supports between nail heads – at least one soil nail head.
On completion of installation of soil nails, the RGE shall submit to the BA key supervision records in the form of Appendix IX certified by his TCP T3. Upon review of the supervision records, if the BA considers that there is cause for concern in relation to the quality of soil nailing works, the BA will require the RGE to carry out non-destructive testing (NDT) of at least 1% of soil nails with a minimum of 2 nails per slope (including wall) to verify the length of the installed soil nails.
Several NDT methods for checking the length of installed soil nails are described in GEO Report No. 133 “Non-destructive Tests for Determining the Lengths of Installed Steel Soil Nails”. Alternatively, the RGE may propose other methods for BA’s agreement at the design stage of the project. A test report with the test results and their interpretations together with re-assessment of the adequacy of the installed soil nails (if needed) shall be submitted to the BA for acceptance.
Quality supervision is applicable for ground investigation field works, soil nailing works and foundation works.
Principles of Quality Supervision
For quality supervision, the principles described in paragraphs 6.3 to 6.6 below will be followed.
In accordance with Building (Administration) Regulation (B(A)R) 37(1) and (2), the RSE and RGE should each give such periodic supervision and make such inspections as may be necessary for building works. For such purpose, they should each have a team of TCPs to inspect the works at a specified frequency and supervise the carrying out of a specified percentage of the works. The RSE, RGE and their TCPs should all be respectively accountable under the BO for the quality of building works but in accordance with their respective responsibilities as specified.
As the RSE and/or RGE have overall responsibility for the works, they should personally inspect and supervise the works at such frequency and extent as they consider appropriate in the circumstances of each case.
The RC, represented by their AS, should have a similar system of supervision as that of the RSE and/or RGE above, but they should give continuous supervision in accordance with B(A)R 41(1). Even if some of the building works are carried out by their sub-contractors, it remains the responsibility of the RC to ensure that the building works and continuous supervision are properly done in accordance with the provisions of the BO and the system of supervision described above.
Inspection records should be kept for each member of the supervision team who should report any non-conformities to the RSE, RGE or AS, as the case may be.
Quality Supervision for Ground Investigation Field Works
All ground investigation field works, in both scheduled and non-scheduled areas, should be carried out by a Registered Specialist Contractor (Ground Investigation Field Works category) (RSC(GIFW)) under proper supervision. To ensure quality of the works, supervision for the different stages of pre-design ground investigation field works, such as drilling/coring, sampling, instrumentation and field testing, should comply with the requirements set out in Table 6.1.
Table 5.3Typical Items for the Check List of Specific Tasks for RGE’s TCPs
ItemNo.
Description
G1
Establish system for communicating with other TCPs.
Routine items
G2
Check that all monitoring check points are installed and readings are being taken in time.
G3
Verify non-conformity and instruct rectification works immediately. Notify all relevant parties in respect of the non-conformity and monitor that rectification measures are properly carried out.
Routine and Engineering items
G4
Report to the RGE immediately if the non-conformity is considered to pose an imminent danger, to be a significant risk or a source of danger or the RC does not comply with rectification instructions.
G5
Check that all lower grade TCPs and RC’s TCPs are making inspections no less than the required frequency and carrying out duties in accordance with the Technical Memorandum and the Code of Practice for Site Supervision.
G6
Check and satisfy that copies of approved plans (or submitted plans for minor works), method statements, precautionary and protective measures proposals and all related drawings and geotechnical documentation are kept on site; and that they are followed, including checking the video record for demolition works.
G7
Check that there is no over-excavation/over-loading and temporary cut and fill slopes will not cause any inadequate margin of safety against instability to adjoining ground/buildings/structures/utility services or any harm to members of the public and workers on site.
Engineering items
G8
Check and monitor that the sequence of work and necessary protection works and supports are installed in accordance with approved plans/agreed method statements/precautionary measures proposals and that the supports are not to be removed or loaded in advance of adequate propping or restraint.
G9
Check that there is no risk of hydraulic failure causing ground collapse or excessive deformation.
G10
Check that there is adequate margin of safety against instability and integrity/functionality of nearby ground/buildings/structures/utility services and members of public and workers on site are not adversely affected/harmed.
G11
Check that the ground and groundwater conditions, ground deformations/vibrations and geotechnical hazards/risks are consistent with the design of excavation and lateral support works.
G12
Check that the geotechnical assumptions (i.e. ground model, surface water regime, ground water regime, ground deformations/vibrations, geotechnical hazards/risks, etc) are consistent with the geotechnical assessment/study/works design, and to assess their compatibility/adequacy taking into account the actual geotechnical conditions encountered on site and the original method statement and precautionary and protective measures proposed, and update the method statement, precautionary and protective measures and advise the RGE accordingly.
Gn
Any other items considered essential by the RGE for the project, including those for quality supervision and other conditions imposed by the BA at approval and/or consent stage.
Table 5.2Typical Items for the Check List of Specific Tasks for RSE’s TCPs
Description
Establish system for communicating with other TCPs.
Check that all monitoring check points are installed and readings are being taken in time.
Verify non-conformity and instruct rectification works. Notify all relevant parties in respect of the non-conformity and monitor that rectification measures are properly carried out.
Report to the RSE if the non-conformity is considered to pose an imminent danger, to be a significant risk or a source of danger or the RC does not comply with rectification instructions.
Check that all lower grade TCPs and RC’s TCPs are making inspections no less than the required frequency and carrying out duties in accordance with the Technical Memorandum and the Code of Practice for Site Supervision.
Check and satisfy that copies of approved plans (or submitted plans for minor works), method statements, precautionary and protective measures proposals and all related drawings are kept on site; and that they are followed, including checking the video record for demolition works.
Check that there is no over-excavation and temporary cut slopes will not cause any instability to adjoining ground/structure/building.
Check that enclosing walls for top down construction show no signs of defect or lack of soundness.
Check and monitor that lateral supports are installed in accordance with approved/agreed sequence and not to be removed in advance of adequate propping or restraint.
Check that the design and supports of formwork, shoring and temporary working platform are adequate to support all intended loads.
Check that there is no risk of artesian conditions for excavation and lateral support works.
Check that stability and integrity of nearby buildings and ground are not adversely affected.
Check that the groundwater table is consistent with design of excavation and lateral support works.
Check that before excavation takes place, the highest new deck level for top down construction is in place and has achieved sufficient strength to provide lateral support.
Any other items considered essential by the RSE for the project, including those for quality supervision and other conditions imposed by the BA at approval and/or consent stage.
Table 5.1Typical Items for the Check List of Specific Tasks for AP’s TCPs
Description
Establish systems for co-ordinating, compiling and filing of reports, maintaining filing systems; and forwarding reports to AP in case of non-conformity.
Check that the hoarding and/or covered walkways are erected to secure safety of the public in accordance with the hoarding plan agreed by the BA.
Check that the provision and condition of scaffolding, catch fans, matscreens and heavy duty nylon mats, as appropriate, are satisfactory.
Check that monitoring check points are installed and readings are taken in time.
Register reports of non-conformity and inform relevant parties of non-conformity.
Report to the AP if the non-conformity is considered to pose an imminent danger, to be a significant risk or a source of danger or the RC does not comply with rectification instructions.
Check that all lower grade TCPs and RC’s TCPs are making inspections no less than the required frequency and carrying out duties in accordance with the Technical Memorandum and the Code of Practice for Site Supervision.
Check and satisfy that copies of approved plans (or submitted plans for minor works), method statements, precautionary and protective measures proposals and all related drawings are kept on site; and that they are followed, including checking the video record for demolition works.
Check and monitor that lateral supports are installed in accordance with approved/agreed sequence and not to be removed in advance of adequate propping or restraint.
Any other items considered essential by the AP for the project, including those for quality supervision and other conditions imposed by the BA at approval and/or consent stage.
The AP, RSE, RGE and AS shall devise check lists for their TCPs by making reference to the typical items listed in Tables 5.1 to 5.4 of this Code and to include any other particular items considered appropriate and necessary for their projects and surrounding conditions.
The TCPs shall carry out their duties as per the check lists devised by their own heads of stream and all the check lists and inspection records shall be kept on site for the inspection of the BA.
A typical checklist suggested for use, Form A, is shown in Appendix II to this Code.
All non-conformities detected during the checking of typical items for specific tasks by the TCPs must be properly recorded in the Non-Conformity and Rectification Reports, Form B at Appendix III to this Code. Detailed procedures for dealing with non-conformities are specified in paragraph 10.3 of this Code.
Table 4.4Responsibilities and Duties under RC’s Stream
Authorized Signatory
Responsibilities
Assuming overall responsibilities in the appointment of his Representative and TCPs.Ensuring the full implementation of the supervision plan regarding his own stream.Ensuring that non-conformities are immediately acted on and that rectification is carried out forthwith.
Duties
Compiling his own part of the supervision plan.Devising checklists of specific tasks for his TCPs.Supervising his Representative and TCPs.Preparing plans, method statement and/or precautionary and protective measures for temporary works categorized as Case 2 and/or Case 3 under paragraph 4.7 of this Code.Notifying the AP of any non-conformities which pose an imminent danger, or cause a material concern for safety.Carrying out site inspections as necessary.
AS’s Representative
Responsibilities
Accountable to the AS for the implementation of the RC’s supervision plan.Representing the AS as the formal point of contact in communication with other functional streams.Taking up overall responsibilities in carrying out site safety measures and actions in accordance with the supervision plan.Ensuring that the line management, including sub-contractors, are conversant with the supervision plan, and that good coordination and communication exists between his TCPs.
Duties
Directing staff and sub-contractors on safety related matters.Coordinating and compiling reports on supervision activities.Dealing with non-conformities.Assisting the AS in the investigation of the causes of each non-conformity and taking measures to prevent further occurrence.
Table 4.4 Cont’d
T4/T5
Responsibilities
Accountable to the AS, through the AS’s Representative, for the implementation of the supervision plan.Taking up relevant responsibilities as set down in the Technical Memorandum and this Code.
Duties
Checking that assumptions made in the design of temporary works and method statements are validated on site.Checking that actual site conditions and works being carried out agree with the approved plans, design requirements, method statements and precautionary and protective measures.Carrying out specific tasks as per checklist devised by AS.Dealing with non-conformities by making referral to the AS’s Representative and notifying TCPs in other streams.
T1-T3
Responsibilities
Accountable to the AS through the AS’s Representative.Taking up relevant responsibilities as set down in the Technical Memorandum and this Code.
Duties
Checking on routine basis that site works comply with general site safety requirements.Checking specialist aspects of work to see that they comply with the submitted supervision plans. (T2 & T3 only)Checking that the works comply with the approved plans (or submitted plans for minor works), method statements, precautionary and protective measures.Checking that subordinate TCPs have carried out routine checks at the correct frequency and that records are prepared and filed on site. (T2 & T3 only)Carrying out specific tasks as per checklist devised by AS.Dealing with non-conformities by making referral to the AS’s Representative and notifying TCPs in other streams.
Division of responsibility between AP/RSE/RGE and RC for Temporary Works and Working Procedures
The AP/RSE/RGE/RC have the responsibility to ensure the integrity of the temporary structure itself and the associated fixing methods.
The division of responsibility between AP/RSE/RGE and RC for temporary works and working procedures is detailed below:
Case 1 When the prescribed plans stipulate the temporary works, and the sequence of construction or method statements are also shown on prescribed plans, both the AP/RSE/RGE and the RC have their own responsibilities to supervise the carrying out of the works in accordance with the approved/prescribed plans and the Buildings Ordinance and Regulations.
Case 2 When the temporary works, the sequence of construction or method statements are not required to be shown on prescribed plans and have no effect on the permanent structure by way of overstressing or overloading, the RC has the sole responsibility of ensuring the integrity of temporary works and that the carrying out of temporary works should be safe and should not endanger the workers on site, the public and adjoining buildings.
Case 3 When the temporary works, the sequence of construction or method statements are not required to be shown on the prescribed plans but may have effect on the permanent structure by way of overstressing or overloading, the RC shall appoint a person whose qualification and experience are not inferior to a TCP of grade T5 to certify the plans, design information and/or method statement of the temporary works which are to be submitted to the Project RSE/RGE. The person so appointed should also certify the completion of such works. The RSE/RGE may require the RC to submit further calculations to substantiate his design of the temporary works as necessary.
Figure 4.2 illustrates the procedures for dealing with temporary works.
Code of Practice for Site Supervision 