Supporting and reinforcing system for subway station foundation pit construction

Abstract

The utility model discloses a supporting and reinforcing system for subway station foundation pit construction, which comprises a plurality of supporting piles, jet grouting water stop piles and concrete retaining walls which are respectively arranged on two sides of a subway station foundation pit, the plurality of supporting piles are respectively positioned on two sides of a box culvert, each supporting pile penetrates through a bottom sand layer of the subway station foundation pit, and the concrete retaining walls are arranged on two sides of the box culvert. The rotary jet grouting water stop piles are located on one sides of the supporting piles and penetrate through a bottom sand layer of a subway station foundation pit, the concrete retaining wall is located between every two adjacent supporting piles and connected with the two adjacent supporting piles, a plurality of horizontal grating steel frames are arranged in the concrete retaining wall, and soil body reinforcing water stop structures are arranged on the pile edges, close to the supporting piles, of soil bodies on the two sides of the box culvert. The supporting and reinforcing system is simple in structure, supporting and reinforcing can be carried out on construction of the subway station foundation pit only by arranging the supporting piles, the jet grouting water stop piles and the concrete retaining walls, and foundation soil can be reinforced and stabilized by arranging the soil body reinforcing water stop structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to subway station foundation pit construction technical field especially relates to a subway station foundation pit construction is used support reinforcing system. BACKGROUND

[0002] With the rapid development of urban rail transit, more and more cities begin to build urban rail transit network composed of multiple subway lines, subway station is an important building in urban rail transit network, it is the place for passengers to get on and off, transfer and wait, in order to ensure the smooth construction of subway station foundation pit and the safety of surrounding underground facilities and subway station, support structure needs to be set in the process of subway foundation pit construction, foundation pit support structure is usually steel support support, the existing support structure has the following shortcomings:

[0003] 1), a large number of steel support support needs to be used, and to prevent the instability of steel support due to compression;

[0004] 2), temporary support and contact beam restraint support need to be usually set, the construction cost needs to be invested is high, the construction time is long, and the degree of manual labor is also large. INVENTION CONTENTS

[0005] In view of the technical problems existing in the prior art of foundation pit support reinforcing system, the technical problem to be solved by the utility model lies in providing a support reinforcing system which is simple in support structure, does not need to set a large number of steel support support structure, does not need to set temporary support and contact beam restraint support, only needs to set support pile, rotary jet water stop pile and concrete retaining wall, can support and reinforce the construction of subway station foundation pit, and the pile edge of the soil body reinforcing water stop structure is arranged on the soil body on the two sides of the box culvert, so as to reinforce the bottom sand layer of the subway station foundation pit and stabilize the support reinforcing system of the foundation soil.

[0006] In order to solve the above technical problems, the utility model provides a support reinforcing system for subway station foundation pit construction, the subway station foundation pit has a box culvert inside, the support reinforcing system comprises a plurality of support piles, rotary jet water stop piles and concrete retaining walls arranged on the two sides of the subway station foundation pit respectively, the plurality of support piles are located on the two sides of the box culvert respectively, each support pile penetrates the bottom sand layer of the subway station foundation pit, the rotary jet water stop pile is located on one side of the support pile and penetrates the bottom sand layer of the subway station foundation pit, the concrete retaining wall is located between the adjacent two support piles and connected with the adjacent two support piles, the concrete retaining wall contains a plurality of horizontal grid steel frames, and the soil body reinforcing water stop structure is arranged on the pile edge of the support pile on the two sides of the box culvert.

[0007] Further, the soil body reinforcing water stop structure comprises a plurality of drill holes, and the plurality of drill holes are distributed at the soil body on the two sides of the box culvert at intervals, and cement mortar is injected into each drill hole.

[0008] Further, each horizontal grid steel frame comprises four support main bars and a plurality of ring-shaped hoops, the plurality of ring-shaped hoops are longitudinally and uniformly distributed on the four support main bars, each ring-shaped hoop surrounds the outer periphery of the four support main bars and is welded therewith, and the four support main bars are connected by the plurality of ring-shaped hoops to form the horizontal grid steel frame.

[0009] Further, the oblique reinforcing bars are fixed between two adjacent ring-shaped hoops.

[0010] Further, the pile body of the support pile is pre-buried with a steel ring, the steel ring is welded with a plurality of vertical steel plates, and two support main bars of the horizontal grid steel frame are welded with the vertical steel plates respectively.

[0011] Further, the steel ring of the support pile is fixed with five steel ring anchor bars in the vertical direction, the five steel ring anchor bars are arranged in a radial manner, and the five steel ring anchor bars are anchored into the pile body of the support pile.

[0012] Further, the distance between two adjacent steel ring anchor bars is 300 mm, and each steel ring anchor bar is a U-shaped anchor bar.

[0013] Compared with the prior art, the scheme of the utility model at least contains the following beneficial effects:

[0014] The support and reinforcement system comprises a plurality of support piles, rotary jet water stop piles and concrete retaining walls arranged on both sides of the foundation pit of the subway station, the support piles are arranged on both sides of the box culvert, each support pile penetrates the bottom sand layer of the foundation pit of the subway station, the rotary jet water stop pile is arranged on one side of the support pile and penetrates the bottom sand layer of the foundation pit of the subway station, the concrete retaining wall is arranged between two adjacent support piles and connected with the two adjacent support piles, the concrete retaining wall comprises a plurality of horizontal grid steel frames, and the soil body reinforcement and water stop structure is arranged on the pile edge of the support pile on both sides of the soil body of the box culvert. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the drawings of the embodiments will be briefly introduced below.

[0016] Figure 1 is the planar arrangement drawing of the support and reinforcement system and the foundation pit of the utility model;

[0017] Figure 2 is the planar drawing of the drill hole in the soil body reinforcement and water stop structure of the utility model;

[0018] Figure 3 is the section view of the drilling hole in the soil body reinforcing water stop structure of the utility model;

[0019] Figure 4 is the relationship schematic view of the horizontal grating steel frame and the concrete retaining wall in the utility model;

[0020] Figure 5 is the relationship schematic view of the horizontal grating steel frame and the horizontal grating steel frame connection of the utility model;

[0021] Figure 6 is the structure schematic view of the horizontal grating steel frame of the utility model;

[0022] Figure 7 is the large sample view of the supporting pile pre-buried steel ring of the utility model;

[0023] Figure 8 is the section schematic view of 1-1 in the utility model. Figure 7

[0024] In the figure, the supporting pile 1, the steel ring 11, the steel plate 12, the steel ring anchor bar 13, the rotary jet water stop pile 2, the concrete retaining wall 3, the horizontal grating steel frame 4, the support main reinforcement 41, the annular hoop reinforcement 42, the inclined reinforcing bar 43, the connecting steel bar 5, the soil body reinforcing water stop structure 6, the drilling hole 61, the subway station foundation pit 7, the box culvert 8. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without creative labor are within the protection scope of the utility model.

[0026] As Figures 1-4 ​The utility model discloses a kind of support reinforcement systems for subway station foundation pit 7 construction, there is a box culvert 8 in the cross of subway station foundation pit 7, which support reinforcement system includes several support piles 1, rotary jet water-stop pile 2, concrete retaining wall 3 respectively arranged in the two sides of subway station foundation pit 7, several support piles 1 are located at the two sides of box culvert 8, every support pile 1 passes through the bottom sand layer of subway station foundation pit 7, support pile 1 is bored 61 cast-in-place pile, rotary jet water-stop pile 2 is located at the side of support pile 1 and passes through the bottom sand layer of subway station foundation pit 7, concrete retaining wall 3 is located between two adjacent support piles 1 and is connected with two adjacent support piles 1, concrete retaining wall 3 contains several horizontal grid steel frames 4, and soil body reinforcement water-stop structure 6 is provided at the pile edge of support pile 1 on the two sides of box culvert 8.In this embodiment, the soil body reinforcement water-stop structure 6 provided is grouting reinforced sand layer structure, both sides of horizontal grid steel frame 4 are sprayed with C20 concrete to form concrete retaining wall 3, the concrete retaining wall 3 formed has 400mm thick, four support piles 1 are respectively provided on the two sides of subway station foundation pit 7, four support piles 1 are respectively located at the two ends of subway station foundation pit 7, concrete retaining wall 3 is used to connect the support pile 1 at the two ends of subway station foundation pit 7, the support pile 1 is chiseled to expose reinforcement, and the exposed reinforcement is connected with the reinforcement of concrete retaining wall 3 by welding.

[0027] The utility model discloses a kind of support reinforcement systems for subway station foundation pit 7 construction, there is a box culvert 8 in the cross of subway station foundation pit 7, which support reinforcement system includes several support piles 1, rotary jet water-stop pile 2, concrete retaining wall 3 respectively arranged in the two sides of subway station foundation pit 7, several support piles 1 are located at the two sides of box culvert 8, every support pile 1 passes through the bottom sand layer of subway station foundation pit 7, support pile 1 is bored 61 cast-in-place pile, rotary jet water-stop pile 2 is located at the side of support pile 1 and passes through the bottom sand layer of subway station foundation pit 7, concrete retaining wall 3 is located between two adjacent support piles 1 and is connected with two adjacent support piles 1, concrete retaining wall 3 contains several horizontal grid steel frames 4, and soil body reinforcement water-stop structure 6 is provided at the pile edge of support pile 1 on the two sides of box culvert 8.In this embodiment, the soil body reinforcement water-stop structure 6 provided is grouting reinforced sand layer structure, both sides of horizontal grid steel frame 4 are sprayed with C20 concrete to form concrete retaining wall 3, the concrete retaining wall 3 formed has 400mm thick, four support piles 1 are respectively provided on the two sides of subway station foundation pit 7, four support piles 1 are respectively located at the two ends of subway station foundation pit 7, concrete retaining wall 3 is used to connect the support pile 1 at the two ends of subway station foundation pit 7, the support pile 1 is chiseled to expose reinforcement, and the exposed reinforcement is connected with the reinforcement of concrete retaining wall 3 by welding.

[0028] In the embodiment, the soil body reinforcing and water-stopping structure 6 comprises a plurality of drill holes 61, the drill holes 61 are distributed at the soil bodies on both sides of the box culvert 8 at intervals, and cement mortar is injected into each drill hole 61. The cement mortar is injected into each drill hole 61 through the hollow anchor rod to form a grouting reinforced sand layer structure, the grouting reinforced sand layer structure can reinforce the unstable soil bodies on both sides of the box culvert 8, improve the stability of the soil bodies, ensure the safety of the support of the subway station foundation pit 7, and avoid affecting the operation of the box culvert 8 in the construction process of the subway station foundation pit 7.

[0029] As shown in Figures 5-6 In the embodiment, each horizontal grid steel frame 4 comprises four support main bars 41 and a plurality of ring-shaped hoops 42, the ring-shaped hoops 42 are longitudinally and uniformly distributed on the four support main bars 41 at intervals, each ring-shaped hoop 42 surrounds the outer periphery of the four support main bars 41 and is welded thereto, and the four support main bars 41 are connected through the plurality of ring-shaped hoops 42 to form the horizontal grid steel frame 4. The horizontal grid steel frame 4 is assembled into an integral support structure by the four support main bars 41 and the plurality of ring-shaped hoops 42, the structure design is simple, and the horizontal grid steel frame 4 is convenient to install and disassemble. The cross section of each horizontal grid steel frame 4 is rectangular, and the horizontal grid steel frame 4 formed by the four support main bars 41 has a plurality of sides. The vertical spacing between the two adjacent horizontal grid steel frames 4 is 0.4 m. In the embodiment, at least one connecting steel bar 5 is arranged between the two adjacent horizontal grid steel frames 4, the two adjacent horizontal grid steel frames 4 are connected through the connecting steel bar 5 to form a triangular structure. In the embodiment, the connecting steel bar 5 can be B18 steel bar. The horizontal grid steel frame 4 provided by the utility model can not only provide space for spraying concrete, but also can strengthen the structural strength. The diagonal reinforcing bars 43 are fixed between the two adjacent ring-shaped hoops 42. The diagonal reinforcing bars 43 effectively strengthen the stress performance of the horizontal grid steel frame 4 and the stability of the overall structure.

[0030] As shown in Figures 7-8 In the embodiment, the steel ring 11 of the support pile 1 is pre-buried, a plurality of vertical steel plates 12 are welded to the steel ring 11, and the two support main bars 41 of the horizontal grid steel frame 4 are welded to the vertical steel plates 12. In the embodiment, the size of the welded vertical steel plate 12 is 300*600 mm, and the height of the steel ring 11 is from the bottom of the box culvert 8 to the bottom of the subway station foundation pit 7. The five steel ring anchor bars 13 are fixed to the steel ring 11 in the vertical direction, the five steel ring anchor bars 13 are arranged in a radial manner, the steel ring anchor bars 13 are anchored into the pile body of the support pile 1, the spacing between the two adjacent steel ring anchor bars 13 is 300 mm, and each steel ring anchor bar 13 is a U-shaped anchor bar.

[0031] The above only discloses preferred embodiments of the utility model, and of course cannot limit the utility model right scope, therefore equivalent changes made according to the utility model right claim still belong to the range covered by the utility model.

Claims

1. A supporting and reinforcing system for the construction of a foundation pit of a subway station, characterized in that: The subway station foundation pit has a box culvert in the inner span, the support and reinforcement system comprises a plurality of support piles, rotary jet water stop piles and concrete retaining walls arranged on both sides of the subway station foundation pit respectively, the support piles are located on both sides of the box culvert respectively, each support pile penetrates the bottom sand layer of the subway station foundation pit, the rotary jet water stop pile is located on one side of the support pile and penetrates the bottom sand layer of the subway station foundation pit, the concrete retaining wall is located between and connected with the adjacent two support piles, the concrete retaining wall contains a plurality of horizontal grid steel frames, and the soil body reinforcement and water stop structure is arranged on the side of the support pile of the soil body on both sides of the box culvert.

2. The retaining and reinforcing system for the foundation pit construction of a subway station according to claim 1, characterized in that: The soil body reinforcement and water stop structure comprises a plurality of drill holes, and the drill holes are distributed at the soil body on both sides of the box culvert at intervals.

3. The retaining and reinforcing system for the foundation pit construction of a subway station according to claim 1, characterized in that: Each horizontal grid steel frame comprises four support main bars and a plurality of ring-shaped hoop bars, the ring-shaped hoop bars are longitudinally and uniformly distributed on the four support main bars at intervals, each ring-shaped hoop bar surrounds the outer periphery of the four support main bars and is welded thereto, and the four support main bars are connected through the plurality of ring-shaped hoop bars to form the horizontal grid steel frame.

4. The retaining and reinforcing system for the foundation pit construction of a subway station according to claim 3, characterized in that: The inclined reinforcing bars are fixed between the adjacent two ring-shaped hoop bars.

5. The retaining and reinforcing system for the foundation pit construction of a subway station according to claim 1, characterized in that: The steel ring of the support pile is pre-buried with a plurality of vertical steel plates welded thereon, and the two support main bars of the horizontal grid steel frame are welded with the vertical steel plates.

6. The retaining and reinforcing system for the construction of a foundation pit of a subway station according to claim 5, characterized in that: Five steel ring anchor bars are fixed on the steel ring of the support pile in the vertical direction, the five steel ring anchor bars are arranged in a radial manner, and the five steel ring anchor bars are anchored into the pile body of the support pile.

7. The retaining and reinforcing system for the construction of a foundation pit of a subway station according to claim 6, characterized in that: The distance between the adjacent two steel ring anchor bars is 300mm, and each steel ring anchor bar is a U-shaped anchor bar.

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