CN217734042U - Deep foundation pit supporting structure - Google Patents

Abstract

The utility model relates to a deep foundation pit supporting structure, which is arranged on a deep foundation pit slope, wherein the deep foundation pit slope comprises a first slope and a second slope, and between the first slope and the second slope There is a platform; a concrete layer with a thickness of not less than 40mm is set on the top and on the slope of the deep foundation pit slope, and a steel mesh layer is set on the surface, and the steel mesh layer is fixed by U-shaped soil nails, and the platform A first concrete retaining wall is arranged near the bottom of the first slope, a second concrete retaining wall is arranged on the platform near the top of the second slope, and a third concrete retaining wall is arranged at the bottom of the second slope; Concrete retaining walls are provided with profiled steel and rebar. As a deep foundation pit supporting structure, this solution can form a good barrier effect by setting the first concrete retaining wall and the second concrete retaining wall on the platform, and the third concrete retaining wall at the bottom of the second slope. It collapses and forms a good support structure with strong stability.

Description

A deep foundation pit support structure

technical field

The utility model belongs to the technical field of foundation pit support, in particular to a deep foundation pit support structure.

Background technique

In the deep foundation pit operation, in order to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, the foundation pit support structure will be used to support and reinforce the side wall of the foundation pit and the surrounding environment, thereby improving the side wall of the foundation pit and the surrounding environment lateral bending capacity. Generally, the rocky slope surface of foundation pit slopes in Southwest China is exposed and its surface is easily weathered, resulting in landslides or rolling of rocks. It is necessary to adopt a foundation pit support structure with strong support capacity, because the support strength is not enough High, there are potential safety hazards, as a kind of technical improvement, how to reasonably support the slope of deep foundation pit is an important subject, and this invention is hereby applied for.

Utility model content

In order to solve the above-mentioned problems in the prior art, the utility model provides a deep foundation pit support structure which can improve the above deficiencies.

The utility model relates to a support structure for a deep foundation pit, which is arranged on the slope of the deep foundation pit. The slope of the deep foundation pit includes a first slope and a second slope, between the first slope and the second slope There is a platform; the top and slope of the deep foundation pit slope are provided with a concrete layer sprayed with a thickness of not less than 40mm, and a steel mesh layer is arranged on the surface, and the steel mesh layer is fixed by U-shaped soil nails, and the U-shaped soil The nails are made of section steel, steel bars or steel frames, and the soil nails go deep into the rock formation. The platform is provided with a first concrete retaining wall near the bottom of the first slope, and the platform is provided with a second concrete retaining wall near the top of the second slope. The third concrete retaining wall is arranged at the bottom of the second slope; steel bars and steel bars are arranged in the first concrete retaining wall; the foundation pit cushion is arranged on the bottom of the deep foundation pit, and the foundation pit cushion and the third concrete retaining wall Together form a resistance structure.

Further, the structure of the third concrete retaining wall and the second concrete retaining wall is the same as that of the first concrete retaining wall, that is to say, shaped steel and steel bars are also arranged inside them.

Further, a fence is set on the top of the slope of the foundation pit, and the fence is set along the length direction of the slope of the foundation pit, which can play a protective role. If necessary, a warning placard is also set on the fence.

Further, anchor rods are set on the slope of the foundation pit.

Further, the angle between the anchor rod and the first slope is smaller than the angle between the anchor rod and the second slope.

Further, the steel mesh layer can be replaced by a three-dimensional planting net and a steel mesh layer, and the three-dimensional plant mesh is covered on the surface of the steel mesh layer and fixed by steel wire binding or other methods.

Further, drainage ditches are arranged outside the third concrete retaining wall.

As a deep foundation pit support structure, this scheme repairs the slope into two slopes, in which there is a platform between the first slope and the second slope, and the first concrete retaining wall and the second concrete retaining wall are set on the platform The wall and the third concrete retaining wall set at the bottom of the second slope can form a good barrier effect, avoid the collapse of the broken body, form a good supporting structure, and have strong stability.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Illustration: 1 fence, 2 first slope, 3 U-shaped soil nails, 4 first concrete retaining wall, 5 second concrete retaining wall, 6 third concrete retaining wall, 7 anchor rod, 8 second slope, 9 steel mesh layer , 10 section steel, 11 concrete layer, 12 drainage ditch, 13 foundation pit cushion.

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

As shown in Figure 1, the utility model relates to a deep foundation pit support structure, which is arranged on the slope of the deep foundation pit, and can be processed by excavation and repair to form a deep foundation pit slope containing the first slope 2 and the second slope 8. There is a platform between the first slope 2 and the second slope 8; the top and slope of the deep foundation pit slope are provided with a concrete layer 11 whose thickness is not less than 40mm, and the surface is provided with Steel mesh layer 9, the steel mesh layer is fixed by U-shaped soil nails 3, U-shaped soil nails are made of section steel, steel bars or steel frames, the soil nails go deep into the rock formation, and the platform is set near the bottom of the first slope 2. A concrete retaining wall 4, the platform is provided with a second concrete retaining wall 5 near the top of the second slope 8, and a third concrete retaining wall 6 is provided at the bottom of the second slope 8; the first concrete retaining wall 4 The profile steel 10 and steel bars are arranged inside, the profile steel passes through the top surface and the bottom surface of the concrete retaining wall, and the steel bars are arranged inside the concrete retaining wall; the foundation pit cushion 13 is arranged on the bottom surface of the deep foundation pit, and the foundation pit cushion and the third concrete retaining wall Together to form a resisting structure, the foundation pit cushion can be used for water isolation, drainage and antifreeze to improve the working conditions of the base and soil.

As a technical improvement, the structure of the third concrete retaining wall and the second concrete retaining wall is the same as that of the first concrete retaining wall, that is to say, they are also provided with section steel and steel bars inside.

As a technical improvement, a fence 1 is set on the top of the slope of the foundation pit, the height of the fence is at least 1800mm, and cement piles are arranged below it, and the fence is set along the length of the slope of the foundation pit, which can play a protective role. Warning placards are also set up on the fence.

As a technical improvement, an anchor rod 7 is arranged on the slope of the foundation pit, and the top end of the anchor rod is fixed to the steel mesh layer.

As a technical improvement, the angle between the anchor rod and the first slope 2 is smaller than the angle between the anchor rod 7 and the second slope 8, generally controlled between 45° and 85°.

As a technical improvement, the stencil layer 9 can be replaced by a three-dimensional planting net and a stencil layer.

As a technical improvement, a drainage ditch 12 is provided outside the third concrete retaining wall 6, and the drainage ditch can be used as a water guide channel to avoid arbitrary pooling of foundation pit water.

During implementation, it is necessary to repair the side slope of the foundation pit to form two slopes, which are named the first slope and the second slope respectively. There is a platform between the two slopes, and then the second slope is set at the bottom of the first slope. A concrete retaining wall, the second concrete retaining wall is set at the top of the second slope, and the third concrete retaining wall is set at the bottom of the second slope. The bottom of the foundation pit is constructed with concrete to form the cushion of the foundation pit. The thickness is determined according to the actual construction requirements. Spray a concrete layer with a thickness of not less than 40mm on the top and surface of the first slope and the top and surface of the second slope. After waiting for solidification, set a steel mesh layer on the surface Or set a steel mesh layer and three-dimensional planting net, the steel mesh layer is fixed by U-shaped soil nails, and a fence is set at the top of the slope.

Claims (7)

1. A deep foundation pit support structure, which is arranged on the slope of the deep foundation pit, is characterized in that: the slope of the deep foundation pit contains a first slope and a second slope, and between the first slope and the second slope There is a platform between them; the slope top and the slope of the deep foundation pit slope are provided with a concrete layer sprayed with a thickness of not less than 40mm, and a steel mesh layer is arranged on the surface, and the steel mesh layer is fixed by U-shaped soil nails. The platform is provided with a first concrete retaining wall near the bottom of the first slope, the platform is provided with a second concrete retaining wall near the top of the second slope, and the third concrete retaining wall is provided at the bottom of the second slope; Sectional steel and steel bars are arranged in the first concrete retaining wall; foundation pit cushion is arranged on the bottom of the deep foundation pit. 2. The deep foundation pit support structure according to claim 1, characterized in that: the third concrete retaining wall and the second concrete retaining wall have the same structure as the first concrete retaining wall. 3. The deep foundation pit support structure according to claim 1, characterized in that: a fence is set on the top of the slope of the foundation pit. 4. A deep foundation pit support structure according to claim 1, characterized in that: anchor rods are arranged on the slope of the foundation pit. 5. The deep foundation pit support structure according to claim 4, characterized in that: the angle between the anchor rod and the first slope is smaller than the angle between the anchor rod and the second slope. 6. A deep foundation pit support structure according to claim 1, characterized in that: the steel mesh layer can be replaced by a three-dimensional planting mesh and a steel mesh layer. 7. The deep foundation pit support structure according to claim 1, characterized in that: a drainage ditch is arranged outside the third concrete retaining wall.

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