Clearance-limited pile foundation retaining wall structure

Abstract

The clearance limited pile foundation retaining wall structure comprises a front row of steel pipe piles, a rear row of steel pipe piles, a bearing platform beam and a reinforced concrete retaining wall, the bearing platform beam is poured at the upper ends of the front row of steel pipe piles and the rear row of steel pipe piles, and the reinforced concrete retaining wall is poured on the bearing platform beam; the vertical face, facing the rear-row steel pipe piles, of the reinforced concrete retaining wall is a retaining face. The structure is characterized in that reinforced concrete columns are poured in the upper ends of the front-row steel pipe piles and the rear-row steel pipe piles, and the upper ends of the reinforced concrete columns extend into and are fixed in the bearing platform beams; the front-row steel pipe piles and the rear-row steel pipe piles are formed by welding steel pipes with the length of 2-3 m. According to the clearance-limited pile foundation retaining wall structure, due to the fact that each section of steel pipe is short and is not limited by clearance, construction can be conveniently carried out at the position where the clearance height is limited below the section, separated from an overpass, of an expressway, and therefore the problems that the clearance below a bridge is insufficient, and construction is difficult are solved.

Description

Technical Field

[0001] The utility model relates to a pile foundation retaining wall structure, and more specifically, to a clearance-limited pile foundation retaining wall structure. Background Art

[0002] Due to the requirements of clear height for highways of different grades, the clearance under the highway separation overpass is often insufficient, so it is necessary to dig down and excavate the foundation under the highway separation overpass, and build retaining walls to protect the slopes on both sides of the highway bridge. For sections with deeper excavation, if the excavation interface is too wide and too deep, it will affect the stability of the original abutment foundation of the separation overpass. The retaining wall should use pile foundation to reduce the excavation depth; pile foundation is usually used in sections with insufficient foundation bearing capacity. The traditional reinforced concrete cast-in-place pile foundation construction is difficult to implement due to height restrictions. Summary of the invention

[0003] In order to overcome the disadvantages of the above technical problems, the utility model provides a clearance-limited pile foundation retaining wall structure.

[0004] The utility model discloses a retaining wall structure of a pile foundation with limited clearance, comprising a front row of steel pipe piles, a rear row of steel pipe piles, a cap beam and a reinforced concrete retaining wall, wherein the front row of steel pipe piles and the rear row of steel pipe piles are arranged at intervals in front and rear, the cap beam is cast on the upper ends of the front row of steel pipe piles and the rear row of steel pipe piles, and the reinforced concrete retaining wall is cast on the cap beam; the vertical surface of the reinforced concrete retaining wall facing the rear row of steel pipe piles is the retaining surface; the utility model is characterized in that: the interior of the upper ends of the front row of steel pipe piles and the rear row of steel pipe piles are both cast with reinforced concrete columns, the upper ends of the reinforced concrete columns extend into and are fixed in the cap beam; the front row of steel pipe piles and the rear row of steel pipe piles are both welded from steel pipes with a length of 2m to 3m.

[0005] The utility model discloses a retaining wall structure with limited clearance pile foundation, wherein the reinforced concrete column is composed of a horizontal partition, reinforcing steel bars, annular stirrups and filling concrete, the horizontal partition is welded to the upper part of the inner cavity of the front row steel pipe piles and the rear row steel pipe piles, the reinforcing steel bars are uniformly welded to the inner wall of the front row steel pipe piles and the rear row steel pipe piles above the horizontal partition, the annular stirrups are fixed to the periphery of the upper part of the reinforcing steel bars, and the filling concrete is poured in the front row steel pipe piles and the rear row steel pipe piles above the horizontal partition.

[0006] The utility model provides a clearance-limited pile foundation retaining wall structure, wherein the upper ends of the front row steel pipe piles and the rear row steel pipe piles are both extended into the pedestal beam, and the extension length is not less than 10 cm; the length of the reinforcing steel bars on the front row steel pipe piles extending into the pedestal is not less than 30 times the diameter of the reinforcing steel bars, and the length of the reinforcing steel bars on the rear row steel pipe piles extending into the pedestal is not less than 40 times the diameter of the reinforcing steel bars.

[0007] The utility model discloses a clearance-limited pile foundation retaining wall structure, wherein an anti-filter layer is arranged on the retaining surface of the reinforced concrete retaining wall, a drainage pipe connected with the anti-filter layer is arranged in the concrete retaining wall, and the outer side of the drainage pipe is low and the inner side is high.

[0008] In the clearance-limited pile foundation retaining wall structure of the utility model, the outer diameters of the front row steel pipe piles and the rear row steel pipe piles are 219 mm to 406.4 mm.

[0009] The utility model provides a clearance-limited pile foundation retaining wall structure, wherein the height of the filled concrete poured in the front row steel pipe piles and the rear row steel pipe piles is not less than 1 times of the outer diameter of the front row steel pipe piles and the rear row steel pipe piles, and the grade of the filled concrete is 30MPa-40MPa.

[0010] In the utility model of the clearance-limited pile foundation retaining wall structure, the concrete grade used for the cap beam and the reinforced concrete retaining wall is 30MPa-40MPa.

[0011] The beneficial effects of the utility model are as follows: the clearance-limited pile foundation retaining wall structure of the utility model is provided with front and rear rows of steel pipe piles, a cap beam and a reinforced concrete retaining wall, the front and rear rows of steel pipe piles are driven into the foundation to support the cap beam, and the reinforced concrete retaining wall is cast on the cap; since the front and rear rows of steel pipe piles are welded with 2m~3m steel pipes, when in use, steel pipe piles are used instead of reinforced concrete cast-in-place piles, and a vibrating hammer is used instead of a pile driver, and a plurality of 2m~3m long steel pipe piles are driven in sections and welded one by one, because each section is short in length and is not restricted by clearance, it is convenient to construct at a position where the clearance height is limited under the separated overpass section of the expressway, thereby solving the problem of insufficient clearance and difficult construction under the bridge.

[0012] Furthermore, reinforced concrete columns consisting of horizontal partitions, reinforcing steel bars, annular stirrups and filled concrete are arranged at the upper ends of the front and rear rows of steel pipe piles to achieve connection with the pedestal beam, thereby ensuring the firmness of the connection between the front and rear rows of steel pipe piles and the pedestal beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a clearance-limited pile foundation retaining wall structure of the utility model;

[0014] Figure 2 for Figure 1 A partial enlarged view of the middle A area;

[0015] Figure 3 This is a usage status diagram of the clearance-limited pile foundation retaining wall structure of the utility model.

[0016] In the figure: 1 front row steel pipe piles, 2 rear row steel pipe piles, 3 cap beam, 4 reinforced concrete retaining wall, 5 reinforced cement column, 6 filter layer, 7 drainage pipe, 8 horizontal partition, 9 reinforcing steel bars, 10 annular stirrups, 11 filling concrete, 12 welding seam. DETAILED DESCRIPTION

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 As shown, a schematic diagram of the structure of the headroom-limited pile foundation retaining wall structure of the utility model is given. Figure 2 Given Figure 1 A partial enlarged view of area A in the middle. Figure 3 A diagram of the use state of the clearance-limited pile foundation retaining wall structure of the utility model is given. The clearance-limited pile foundation retaining wall structure of the utility model shown is composed of a front row of steel pipe piles 1, a rear row of steel pipe piles 2, a cap beam 3 and a reinforced concrete retaining wall 4. The front row of steel pipe piles 1 and the rear row of steel pipe piles 2 are arranged at intervals and driven into the foundation. The cap beam 3 is cast on the top of the front row of steel pipe piles 1 and the rear row of steel pipe piles 2. The cap beam 3 is used to support the reinforced concrete retaining wall 4. The reinforced concrete retaining wall 4 is cast on the cap beam 3. The vertical surface of the reinforced concrete retaining wall 4 facing the rear row of steel pipe piles 2 is the retaining surface to achieve slope protection.

[0019] The front row of steel pipe piles 1 and the rear row of steel pipe piles 2 shown are both welded from 2m~3m steel pipes. Since the 2m~3m steel pipes can be driven into the foundation using a vibrating hammer, there is no need to use a pile driver that requires a large clearance height to drive in reinforced concrete piles. Several 2m~3m long steel pipe piles are driven in sections and welded one by one. Since each section of the steel pipe pile is short and not restricted by clearance, the problem of insufficient clearance under the bridge and difficult construction is solved.

[0020] In order to achieve a firm connection between the front row steel pipe piles 1 and the rear row steel pipe piles 2 and the cap beam 3, the upper ends of the front row steel pipe piles 1 and the rear row steel pipe piles 2 are provided with reinforced concrete columns 5, the lower parts of the reinforced concrete columns 5 are fixed in the front row steel pipe piles 1 and the rear row steel pipe piles 2, and the upper ends are cast in the cap beam 3. The reinforced concrete columns 5 shown are composed of horizontal partitions 8, reinforcing steel bars 9, annular stirrups 10 and filling concrete 11, and the horizontal partitions 8 are welded to the upper parts of the inner cavities of the front row steel pipe piles 1 and the rear row steel pipe piles 2 to prevent the poured filling concrete 11 from leaking downwards.

[0021] The reinforcing steel bars 9 are uniformly welded on the inner wall of the upper ends of the front row steel pipe piles 1 and the rear row steel pipe piles 2, and the reinforcing steel bars 9 are located above the horizontal partition 8, and the upper part of the reinforcing steel bars 9 extends out of the front row steel pipe piles 1 and the rear row steel pipe piles 2. A plurality of ring stirrups 10 are fixed to the periphery of the extending part of the reinforcing steel bars 9. The filling concrete 11 is poured in the front row steel pipe piles 1 and the rear row steel pipe piles 2 above the horizontal partition, and the upper part of the reinforcing steel bars 9 is poured in the cap beam 3. In this way, when the entire retaining wall structure is used for slope protection, when the cap beam 3 applies tensile force to the front row steel pipe piles 1 and compressive force to the rear row steel pipe piles 2, the front row steel pipe piles 1 and the rear row steel pipe piles 2 can also be firmly connected to the cap beam 3.

[0022] The upper ends of the front row steel pipe piles 1 and the rear row steel pipe piles 2 are also extended into the cap beam 3, and the extended length is not less than 10 cm. The length of the reinforcing steel bars 9 on the front row steel pipe piles 1 extending into the cap is not less than 30 times the diameter of the reinforcing steel bars 9, and the length of the reinforcing steel bars 9 on the rear row steel pipe piles 2 extending into the cap is not less than 40 times the diameter of the reinforcing steel bars 9.

[0023] The retaining surface of the reinforced concrete retaining wall 4 is provided with an inverted filter layer 6, and the concrete retaining wall 4 is provided with a drainage pipe 7 connected with the inverted filter layer 6. The drainage pipe 7 has a low outer side and a high inner side so as to discharge the seepage water in time.

[0024] The front row steel pipe piles 1 and the rear row steel pipe piles 2 shown in the figure can use steel pipes with an outer diameter of 219mm~406.4mm. The height of the filling concrete 11 poured in the front row steel pipe piles 1 and the rear row steel pipe piles 2 is not less than 1 times the outer diameter of the front row steel pipe piles 1 and the rear row steel pipe piles 2, and the grade of the filling concrete 11 is 30MPa~40MPa. The grade of concrete used in the cap beam 3 and the reinforced concrete retaining wall 4 is also 30MPa~40MPa.

Claims

1. A clearance-limited pile foundation retaining wall structure, comprising a front row of steel pipe piles (1), a rear row of steel pipe piles (2), a cap beam (3) and a reinforced concrete retaining wall (4), wherein the front row of steel pipe piles and the rear row of steel pipe piles are arranged at intervals in front and rear, the cap beam is cast on the upper ends of the front row of steel pipe piles and the rear row of steel pipe piles, and the reinforced concrete retaining wall (4) is cast on the cap beam; the vertical surface of the reinforced concrete retaining wall facing the rear row of steel pipe piles is the retaining surface; and the characteristics are as follows: A reinforced concrete column (5) is cast inside the upper ends of the front row steel pipe piles and the rear row steel pipe piles, and the upper ends of the reinforced concrete columns extend into and are fixed in the cap beam; the front row steel pipe piles and the rear row steel pipe piles are welded from steel pipes with a length of 2m to 3m.

2. The clearance-limited pile foundation retaining wall structure according to claim 1, characterized in that: The reinforced concrete column (5) is composed of a horizontal partition (8), reinforcing steel bars (9), annular stirrups (10) and filling concrete (11); the horizontal partition is welded to the upper part of the inner cavity of the front row steel pipe piles (1) and the rear row steel pipe piles (2); the reinforcing steel bars are uniformly welded to the inner walls of the front row steel pipe piles and the rear row steel pipe piles above the horizontal partition; the annular stirrups are fixed to the outer periphery of the upper part of the reinforcing steel bars; and the filling concrete is poured into the front row steel pipe piles and the rear row steel pipe piles above the horizontal partition.

3. The clearance-limited pile foundation retaining wall structure according to claim 2, characterized in that: The upper ends of the front row steel pipe piles (1) and the rear row steel pipe piles (2) are both extended into the cap beam (3), and the extended length is not less than 10 cm; the reinforcing steel bars (9) on the front row steel pipe piles extend into the cap by a length not less than 30 times the diameter of the reinforcing steel bars, and the reinforcing steel bars on the rear row steel pipe piles extend into the cap by a length not less than 40 times the diameter of the reinforcing steel bars.

4. The clearance-limited pile foundation retaining wall structure according to claim 1 or 2, characterized in that: An anti-filter layer (6) is arranged on the retaining surface of the reinforced concrete retaining wall (4), and a drainage pipe (7) connected to the anti-filter layer is arranged in the concrete retaining wall, wherein the outer side of the drainage pipe is low and the inner side is high.

5. The clearance-limited pile foundation retaining wall structure according to claim 1 or 2, characterized in that: The outer diameters of the front row steel pipe piles (1) and the rear row steel pipe piles (2) are 219 mm to 406.4 mm.

6. The clearance-limited pile foundation retaining wall structure according to claim 1 or 2, characterized in that: The height of the filling concrete (11) poured in the front row steel pipe piles (1) and the rear row steel pipe piles (2) is not less than 1 times the outer diameter of the front row steel pipe piles (1) and the rear row steel pipe piles (2), and the grade of the filling concrete (11) is 30MPa~40MPa.

7. The clearance-limited pile foundation retaining wall structure according to claim 1 or 2, characterized in that: The concrete grade used for the cap beam (3) and the reinforced concrete retaining wall (4) is 30MPa-40MPa.

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