Measurement and quota pricing of post-installed (bonded) rebar: counted by piece, the 15d embedment-depth basis, and adjustment by each +/-1 cm sub-item (consumption standards and railway quota calibers)

Topic Positioning

From measurement and pricing angles, this card answers "how to measure and price post-installed rebar": counted by "piece" under dedicated sub-items, adjusted by increase/decrease sub-items when embedment depth differs from the 15d basis; it also distinguishes post-installed bars from ordinary anchorage bars (merged into member rebar quantities) in listing and measurement.

Core Conclusions

1. Measurement unit and quantity

• Post-installed rebar is counted by "piece" per the design drawings or approved construction scheme (SJG 181.2-2024 Consumption Standard for Municipal Works, Vol. 2: Bridges and Culverts, Clause 5.2.9).
• Contrast: anchorage bars projecting from cast members are determined in length per design and merged into that member's rebar quantity (GB/T 50854-2024 Appendix E, E.7.9, Item 10).

2. BOQ listing

• Post-installed bars not required by design are not listed or measured separately; where design requires, list under the member's rebar item and add the embedment-requirement description (GB/T 50854-2024 Appendix E, E.7.9, Item 13).
• For bars not design-required, all processes are included in the corresponding embedded-bar work content (GB/T 50860-2024 Standard for Measurement of Structures Works, A.15.11).

3. Quota pricing (consumption-standard caliber)

• Work content: sub-items comprehensively cover drilling directions, including drilling, hole cleaning, bar fabrication/installation, and adhesive injection (SJG 181.2-2024 Clause 5.1.9, Item 1). Beijing's work contents include positioning, drilling, hole cleaning, bar forming, adhesive injection, planting, curing (DB11/T 2382-2024 Appendix G rail transit).
• Depth basis and adjustment: sub-items compiled at 15d (d = bar diameter); where actual depth differs, adjust by the corresponding increase/decrease sub-items (SJG 181.2-2024 Clause 5.1.9, Item 2). Beijing likewise provides "embedment 15d" and "each +/-1 cm" sub-items, e.g., G1-4-146 "post-installed rebar, embedment 15d, D10" and G1-4-154 "each +/-1 cm, D10", both per "piece".
• Railway caliber: TB/T 10831-2024 Vol. 10, Chapter 1, Section 9 repair works, "post-installed bars" (FY-1163-FY-1167, D10-D40), per "10 pieces"; work content: straightening, cutting, stacking; hole setting, drilling, aligning, removing dust, cleaning and drying; bar polishing, acetone wiping; mixing structural adhesive, injecting, planting, curing.

4. Practice points

• Pricing contrast: cast-in anchorage is converted to mass by length, merged into member rebar and priced with the member; design-required post-installed bars are counted by piece under dedicated sub-items covering drilling-cleaning-injecting-planting-curing, adjusted by depth sub-items.
• Settlement: check drawing depth vs the 15d basis and compute adjustments for the difference; non-design bars are neither listed nor priced (process already in rebar work content).

Applicable Boundaries

• Sub-item structure and the 15d basis are local/industry consumption-standard calibers (Shenzhen SJG 181.2-2024, Beijing DB11/T 2382-2024, railway TB/T 10831-2024); not directly transferable across regions — follow the project's current standard and its increase/decrease rules.
• Listing rules per the national GB/T 50854-2024 and GB/T 50860-2024; item characteristics per the drawings.
• Structural design of embedment depth (per JGJ 145-2013, GB 50367-2013) is out of scope.

Further Reading

• GB/T 50854-2024 Appendix E, E.7.9 notes on rebar, bolts and inserts (Items 10, 13)
• GB/T 50860-2024 A.15.11
• SJG 181.2-2024 Vol. 2: Bridges and Culverts, Clauses 5.1.9 and 5.2.9
• DB11/T 2382-2024 Appendix G rail transit, Table G.1.21-4 post-installed rebar (G1-4-146, G1-4-154)
• TB/T 10831-2024 Vol. 10: Buildings, Chapter 1 Section 9 "post-installed bars" (FY-1163-FY-1167)