Legend:
Explanations & Illustrations
Rationale
Note
Figures & Tables
Revision history
Clause History
| S/No | Clause Numbers | Changes in TRHS 2023 as compared to TRHS 2017 |
|---|---|---|
| 1 | 2.3.2 – Slab Thickness of HS and Enclosed NS | Rephased Clauses for Clarity and Revised Numbering (c) Floor slab of bottom-most HS without NS below - 200mm. (d) Floor slab of bottom-most NS in contact with soil - 200 mm. |
| 2 | 2.4.1 – HS Position | New Clause (d)Where non-reinforced concrete roof or non-clay tile roof is provided for landed house, there shall be reinforced concrete elements to meet setback distance at least one storey above the HS. |
| 3 | 2.4.1 – HS Position | New Clause (e)Where a non-reinforced concrete lift core in a landed house is located within setback distance of the HS wall (without HS door), such lift core shall be covered with either reinforced concrete roof or clay tile roof and meet the setback distance. |
| 4 | 2.4.5 – Full Height Shielding Walls to HS Wall (without HS Door) | Revised Figure Numbering (a) (i) and (ii). |
| 5 | 2.4.5 – Full Height Shielding Walls to HS Wall (without HS Door) | New Clause (a) (v) Shielding wall “A” and “B” that spans across more than 1HS with shortfall of setback distance on one side of HS. |
| 6 | 2.4.5 – Full Height Shielding Walls to HS Wall (without HS Door) | Revised Design Dimension (b) (i) The air gap for this shielding wall is increased to 225mm. |
| 7 | 2.4.5 – Full Height Shielding Walls to HS Wall (without HS Door) | New Clause (b) (i) RC slab of at least 300mm thick and at least 125mm thick shall be provided at the roof and at the top-most storey level immediately below this roof slab respectively. |
| 8 | 2.4.7 – RC Lift Core or/and Refuse Chute or/and Service Riser located within Setback Distance of HS | Revised Clause (a) RC lift core can be located within the setback distances of HS walls. Where the RC lift core is abutting the HS wall, an additional 50mm thickness shall be provided to the common wall between lift wall and HS wall. |
| 9 | 2.4.7 – RC Lift Core or/and Refuse Chute or/and Service Riser located within Setback Distance of HS | New Clause (c) Where the service riser is abutting the HS or located within the setback distances and it protrudes above the main roof, they shall comply with the requirements shown in FIGURE 2.4.7c(i) to 2.4.7c(vi). |
| 10 | 2.4.7 – RC Lift Core or/and Refuse Chute or/and Service Riser located within Setback Distance of HS | New Clause (d) Where the service riser is located within the setback distance of the HS walls (without door), the design shall comply with the requirements as shown in FIGURE 2.4.7d(i) & d(ii). |
| 11 | 2.4.8 – Void within Setback Distance of HS Walls (Without HS Door) | New Clause (a) Void located within 1000mm from HS walls. (b) Void located beyond 1000mm from HS walls. (c) Void located behind a shielding wall. |
| 12 | 2.4.9 Staircase in non- landed development and located within Setback Distances of HS Walls (Without HS Door) | New Clause Staircase can be located within the setback distance of HS walls (without HS door). |
| 13 | 2.6.1 - Design of Precast Hollow Core Household Shelters (Precast HS) | Removed Clause Removed ‘constructed for residential developments with GFA of 2000m2 and above’. |
| 14 | 2.7.1 – General | Removed Clause Removed (a)(iii) TV outlets. |
| 15 | 2.7.1 – General | Revised Clause Removed (c) ‘shall not exceed 1200mm from the FFL’ and ‘be mounted at between 450mm and 1200mm from the FFL to’. Added ‘and other statutory requirements for peacetime usage’. |
| 16 | 2.7.2 – Power Points | Rephased Clause for Clarity Removed ‘TV outlets’ and Added ‘telephony outlet’. |
| 17 | 3.2.1 – Concrete | New Clause Concrete used in HS/NS structures (including hollow core and joints), as well as concrete used for structures within shelter setback distance, should be of normal concrete density (2400kg/㎥) and consists of 20mm nominal maximum size coarse aggregate. |
| 18 | 3.2.2 – Steel Reinforcement | New Clause “and of ductility class B or better.” |
| 19 | 3.4.2.5 – Reinforcement Bar Details of Precast Shielding Wall for HS Wall | Rephased Clause for Clarity (b) Reinforcements at both faces of the shielding wall shall be minimum H10-200 c/c. Minimum links shall be provided in both directions. |
| 20 | 3.5.6 – Precast HS Hollow Core | New Clause For precast HS walls abutting lift walls and requiring additional 50mm thickness, the hollow core sizes shall remain to be same (Table3.5.6(b)) as the precast HS walls with normal thickness. The concrete cover thickening shall occur at the common wall between HS wall and lift wall. |
| 21 | 3.5.8 – PPVC Connections | New Clause The load transfer of these PPVC modules shall not adversely affect the structural integrity and protection level of the HS in any way. (a) There shall not be load transfer from PPVC modules (transferring shear, bending moment, etc) onto HS wall unless the connection has been checked for structural adequacy and it is confirmed such load does not compromise the HS protective design. (b) There shall be no recess in HS wall that cause reduction in HS wall thickness due to PPVC connections. |
| 22 | Table 3.5.6(a) – Dimension of Precast Hollow Cores HS | Revised Dimension Changes for d2 and d3. |
| 23 | 4.2 – Position | New Clause (b) Ventilation sleeves shall ‘not be located in areas such as toilets, bathroom etc.’ |
| 24 | 6.2 – Structural Works | Rephased Clauses for Clarity (c), (e), (f) |
| 25 | 6.3 – HS Door | New Clauses (d) Modification of door frame, cutting of door frame stiffener for ease of installing is not permitted. |
| 26 | 6.5 – Commissioning Requirements | New Clauses Added ‘a valid calibration certificate’. |
| 27 | 7.2.2 – Not Permitted Works to HS | Rephased Clauses for Clarity (g) Removed ‘Indiscriminate’. |
| 28 | 7.2.2 – Not Permitted Works to HS | Rephased Clause for Clarity Removed ‘Indiscriminate’ and ‘are not permitted’. |
| 29 | Chapter 8 | New Chapter Regulated Shelter Products. |