张弦梁钢桁架支撑在某箱体基坑工程中的应用研究

黄祖腾; 杨静; 高鹏瑜

doi:10.20265/j.cnki.issn.1007-2993.2024-0566

张弦梁钢桁架支撑在某箱体基坑工程中的应用研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0566

1.
深圳市巨鲲科技有限公司，广东深圳　518000
2.
上海巨鲲科技有限公司，上海　200433

详细信息

作者简介:
黄祖腾，男，1990年生，大学本科，工程师，主要从事岩土工程装配式钢支撑研究。Email：834774654@qq.com

中图分类号: TU399
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- 被引次数: 0
出版历程
- 收稿日期: 2024-12-02
- 修回日期: 2025-04-23
- 录用日期: 2025-04-23
- 网络出版日期: 2026-04-09
- 刊出日期: 2026-04-09

Application of beam string steel truss support in a box foundation pit project

1.
Shenzhen Blue Whale Tech Co., Ltd., Shenzhen 518000, Guangdong, China
2.
Shanghai Blue Whale Tech Co., Ltd., Shanghai 200433, China

摘要

摘要: 随着城市地下空间开发向深大化发展，绿色可回收支护技术成为基坑工程的重要发展方向。以粤港澳大湾区某污水处理厂箱体式深基坑工程为研究对象，论证了预应力装配式张弦梁钢桁架支撑技术的工程适用性及环境效益。通过构建混凝土支撑与张弦梁钢支撑多方案对比模型，结合有限元数值模拟与施工全过程监测，揭示了该技术的力学特性与变形控制机理。研究结果表明：（1）预应力调控系统可实现基坑变形主动控制，部分桩顶位移监测点出现最大值为−8.4 mm的反向变形；（2）模块化装配技术使支撑间距由18 m扩展至30 m，释放30%作业空间，施工效率提升；（3）构建钢−混凝土组合支护体系，解决异形基坑平面适配难题；（4）量化环境效益显示，钢构件回收率达95%以上，减少建筑垃圾及碳排放。本案例为深基坑绿色支护技术提供了量化设计范式，对推动可持续岩土工程发展具有实践价值。
- 张弦梁 /
- 钢桁架 /
- 基坑支护 /
- 装配式 /
- 预应力
Abstract: With the development of urban underground space to deep and large, green recyclable support technology has become an important development direction of foundation pit engineering. In this paper, the engineering applicability and environmental benefits of the prestressed prefabricated beam string steel truss support technology of a sewage treatment plant in the Guangdong-Hong Kong-Macao Greater Bay Area are systematically demonstrated. By constructing a multi-scheme comparison model of concrete support and beam string steel truss support, combined with finite element numerical simulation and monitoring of the whole construction process, the mechanical properties and deformation control mechanism of the technology are revealed: (1) The prestress control system can realize the active control of foundation pit deformation, and the maximum reverse deformation of some pile top displacement monitoring points is –8.4 mm; (2) The modular assembly technology expands the support spacing from 18 m to 30 m, frees up 30% of the working space, and improves the construction efficiency; (3) A steel-concrete composite support system could effectively solve the problem of plane adaptation of special-shaped foundation pits; (4) The quantitative environmental benefits show that the recycling rate of steel components is more than 95%, reducing construction waste and carbon emissions. This case provides a quantitative design paradigm for green support technology for deep foundation pits, and has practical value for promoting the development of sustainable geotechnical engineering.
- beam string /
- steel truss /
- green support /
- assembled /
- prestressed

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图 1 张弦梁钢桁架支撑系统组成示意

Figure 1. Schematic diagram of the composition of the beam string steel truss support system

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图 2 张弦梁钢桁架受力示意图

Figure 2. Schematic diagram of the stress of the beam string steel truss

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图 3 基坑周边环境图

Figure 3. The surrounding environment of the foundation pit

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图 4 典型剖面图（单位：mm）

Figure 4. Typical profile（Unit: mm）

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图 5 混凝土支撑方案

Figure 5. Concrete support scheme

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图 6 张弦梁钢桁架支撑方案

Figure 6. Beam string steel truss bracing scheme

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图 7 位移最大节点位置示意图

Figure 7. Schematic diagram of the position of the node with the largest displacement

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图 8 预埋件安装

Figure 8. Installation of embedded parts

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图 9 预埋管安装

Figure 9. Installation of embedded pipes

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图 10 牛腿及加劲板焊接

Figure 10. Welding of corbel and stiffener plate

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图 11 支架梁安装

Figure 11. Bracket beam installation

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图 12 钢桁架安装

Figure 12. Steel truss installation

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图 13 张弦梁安装

Figure 13. Beam string installation

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图 14 二次灌浆

Figure 14. Secondary grouting

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图 15 现场实况图

Figure 15. View of the site

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图 16 基坑监测点布置

Figure 16. Layout of foundation pit monitoring points

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图 17 基坑支护桩深层水平位移曲线图

Figure 17. Horizontal displacement curve of deep foundation pit support pile

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表 1 岩土一般物理力学指标设计参数

Table 1. Design parameters of general physical and mechanical indicators of rock and soil

地层编号	岩土层名称	天然密度ρ /(g·cm⁻³)	直接快剪
地层编号	岩土层名称	天然密度ρ /(g·cm⁻³)	黏聚力 c/kPa	内摩擦角 φ/(°)
①	耕植土	1.86	21.6	13.5
①₁	杂填土	1.85	10.0	15.0
①₂	素填土	1.84	23.4	13.8
②₁	黏土	1.86	25.0	14.0
②₂	细砂	1.90	2.0	28.0
②₃	黏土	1.88	25.0	14.4
③₁	黏土	1.92	15.0	10.0
④₁	强风化泥质粉砂岩	1.95	35.0	25.0
④₂	中等风化泥质粉砂岩	2.05	100.0	40.0
⑤₁	强风化凝灰岩	1.95	35.0	25.0
⑤_2-1	中等风化凝灰岩（较破碎）	2.10	100.0	42.0
⑤_2-2	中等风化凝灰岩（较完整）	2.15	120.0	45.0

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表 2 钢支撑与砼支撑特点对比表

Table 2. Comparison table of the characteristics of steel support and concrete support

对比项目	钢支撑	砼支撑
开挖面积	大	小
施工工期	短	长
建筑垃圾	少	多
构件回收	可	不可
施工噪音	小	大
扬尘	无	有

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表 3 节点位移表

Table 3. Nodal displacement table

序号	节点号	垂直基坑位移/mm
1	40	10.5
2	292	10.9
3	394	8.2
4	444	6.2
5	494	7.0
6	629	15.8
7	646	15.8
8	848	6.3
9	898	7.7
10	950	7.7

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表 4 预拼装段数表

Table 4. Table of the number of pre-assembled segments

序号	分段构件	分段长度/m	分段质量/t
1		7	5.6
2		11	6.8
3		6	4.5

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表 5 监测结果汇总表

Table 5. Summary table of monitoring results

监测项目	累计变化		报警指标
监测项目	点号	最大值	报警值	控制值
支护桩顶水平位移/mm	Z06	21.88	±36	±45
支护桩顶竖向位移/mm	S19	−27.8	±36	±45
深层水平位移/mm	C11	26.34	±40	±50
立柱桩沉降/mm	LX14	16.35	±20	±25

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参考文献(13)

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