A foundation pit support system and its construction method used in expansive soil areas

A technology of foundation pit support and expansive soil, which is applied in the direction of foundation structure engineering, excavation, construction, etc., can solve the problems of expansive soil foundation pits being flooded by rainfall and increased expansion force, etc., to enhance the strength of nodes and connections, and reduce loads , Enhance the effect of supporting ability

Active Publication Date: 2017-03-22
XIAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foundation pit support system can effectively solve the problem of expansive soil foundation pit being flooded by rainfall, and can also solve the problem of a sharp increase in swelling force after the slope is flooded

Method used

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  • A foundation pit support system and its construction method used in expansive soil areas
  • A foundation pit support system and its construction method used in expansive soil areas
  • A foundation pit support system and its construction method used in expansive soil areas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] like figure 1 , figure 2 , image 3 and Figure 4 A foundation pit supporting system shown in the expansive soil area includes a flexible anti-seepage layer 5 laid on the foundation pit slope 4 and a restraint layer 2 laid on the flexible anti-seepage layer 5, the The restraint layer 2 is composed of a plurality of longitudinal restraint belts 2-1 and a plurality of transverse restraint belts 2-2 interlaced. The flexible anti-seepage layer 5 and the soil nails 3 extending into the slope 4 of the foundation pit.

[0052] In this embodiment, the soil nail 3 and the flexible anti-seepage layer 5 are connected together through the bound layer 2, and the earth pressure generated by the foundation pit slope 4 is transmitted to the bound layer 2 through the flexible anti-seepage layer 5, and then transmitted by the bound layer 2 Give the soil nail 3, and then transfer it to the soil layer beyond the sliding surface by the soil nail 3. By setting a layer of flexible anti-...

Embodiment 2

[0065] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that the foundation pit support system for expansive soil areas also includes horizontally arranged along the foundation pit slope 4 and pressed on the longitudinal restraint belt 2-1 The steel beams 7 and the lattice beams 11 vertically arranged along the slope 4 of the foundation pit and pressed on the transverse restraint belt 2-2. The steel beam 7 is formed by splicing two parallel shaped steels 7-1. The lattice beam 11 is a reinforced concrete beam.

[0066] like Figure 6 and Figure 7 As shown, an anchor rod 6 is arranged between the two section steels 7-1, and one end of the anchor rod 6 passes through the longitudinal restraint belt 2-1, the steel mesh 1 and the flexible anti-seepage layer 5 sequentially and extends into the The slope 4 of the foundation pit, the other end of the anchor rod 6 passes through between the two shaped steels 7-1 and passes through the wedge-shape...

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Abstract

The invention discloses a foundation pit support system applied to expansive soil regions. The foundation pit support system applied to the expansive soil regions is composed of a flexible impervious layer and a bond layer, wherein the bond layer is composed of a plurality of longitudinal bonding belts and a plurality of transverse bonding belts in a crossed mode; the crossed positions of the longitudinal bonding belts and the transverse bonding belts are fixedly provided with soil nails. The foundation pit support system applied to the expansive soil regions solves the problem of immersion of expansive soil foundation pits in rain and meanwhile solves the problem of abrupt increase of expansive force of immersed slopes. The invention also discloses a construction method of the foundation pit support system applied to the expansive soil regions. The foundation pit support system applied to the expansive soil regions is implemented layer by layer along with the digging depth of foundation pits and is characterized by comprising the steps of drilling soil nail holes and anchor holes; grout-fixing the soil nails and anchor bolts; laying the flexible impervious layer; laying a reinforcing bar mesh; setting the bonding layer; laying lattice beams; laying steel beams; closing after-pouring holes. The construction method of the foundation pit support system applied to the expansive soil regions is simple in operation and high in construction efficiency; the obtained foundation pit support system applied to the expansive soil regions is high in support capacity.

Description

technical field [0001] The invention relates to a foundation pit support system and a construction method thereof, in particular to a foundation pit support system and a construction method used in expansive soil areas. Background technique [0002] There are a variety of foundation pit support methods, and pile-anchor support, soil nail wall support and prestressed anchor cable composite soil nail wall are commonly used in expansive soil areas. Expansive soil is a special soil that swells when it encounters water and shrinks when it loses water. For soil nailed walls and prestressed anchor cable composite soil nailed walls, the expansion force of expansive soil foundation pits increases a lot after being exposed to water, but the soil nail nodes and The existence of these two problems, the weak strength of the connecting members, makes the foundation pit prone to cracking of the concrete surface and shallow slumping damage of the foundation pit wall. At present, to solve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 张辉郅彬梁迪韩晓雷
Owner XIAN UNIV OF SCI & TECH
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