Riverbed deep foundation pit structure for constructing landslide mass by building island in water

Abstract

The utility model relates to a riverbed deep foundation pit structure for constructing a landslide mass in water, which comprises an island construction platform arranged above a riverbed and the landslide mass arranged below the riverbed, a foundation pit is arranged on the upper end face of the island construction platform, a plurality of pile holes are uniformly distributed at the side end of the foundation pit, steel plates are placed in the pile holes, and the steel plates are arranged on the side end of the foundation pit. The bottom of the foundation pit is connected with a pile column, a pile foundation and a support are arranged in an inner cavity of the foundation pit, the upper end face of the pile column is connected with the pile foundation, the upper end of the pile foundation is connected with a pier column, and the support is arranged above the pile foundation. The weir body is effectively prevented from being scoured by river water through the island building platform, and the water stopping and seepage preventing effects are improved; the island building platform, the landslide body and the sinking soil are connected in series through the pile holes, displacement of the landslide body is effectively controlled, steel buried in concrete can be saved, and the effects of saving materials, preventing water return of the foundation pit and preventing collapse can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a riverbed deep foundation pit structure for constructing landslide bodies in water islands. Background Art

[0002] Landslide areas are widely distributed in mountainous areas of my country, and it is inevitable to set up bridge structures in landslide areas. Since there are strict requirements on the deformation of bridge piers, they can generally only withstand vertical forces. The horizontal bearing capacity of bridge pile foundations and piers is relatively low. Therefore, it is usually necessary to control the landslides at the piers to avoid excessive landslide thrust, which may cause dangers such as pier displacement and cracking.

[0003] The patent number is CN201721609837.1, and the application date is 2017-11-27. The patent discloses a structure for reducing the horizontal force of a bridge pier foundation on a landslide. The bridge pier pile foundation (43) and the cap (42) are located in the middle and lower part of the landslide body (22). The structure is characterized by comprising: anti-slide piles (31) arranged at intervals in the landslide body (22) on the mountain side of the bridge pier foundation pit, and the lower part of the anti-slide piles passes through the sliding surface (23) and enters the stable rock and soil layer; a retaining plate (32) hung between the cantilever sections of adjacent anti-slide piles (31); backfilling ordinary soil (12) and a flexible geotextile mat (11), wherein the flexible geotextile mat (11) is arranged at the inner side wall of the anti-slide pile (31), and the backfilled ordinary soil (12) is filled between the flexible geotextile mat (11) and the cap (42).

[0004] The above patent can effectively resist the downward thrust through anti-slide piles; due to the deformation buffering effect of the flexible geotextile mat, the horizontal force transmitted from the anti-slide piles to the bridge pier cap can be significantly reduced, the horizontal deformation of the bridge pier can be reduced, and the safety and normal use of the bridge can be ensured. However, the structure of the deep foundation pit of the riverbed of the landslide body for underwater island construction usually first uses an excavator to carry out large-scale landslide body excavation along the river slope area, and then pours a gravity concrete retaining wall for protection, and then excavates a deep foundation pit in the riverbed area, and finally constructs the foundation. This structure wastes materials and the foundation pit is prone to backflow and collapse. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a riverbed deep foundation pit structure for landslide body construction in water, which adopts reasonable structural design to save materials, prevent water from flowing back into the foundation pit and prevent collapse.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A riverbed deep foundation pit structure for constructing landslide bodies in water includes an island-building platform arranged above the riverbed and a landslide body arranged below the riverbed. The upper end surface of the island-building platform is provided with a foundation pit, and a plurality of pile holes are evenly distributed on the sides of the foundation pit. Steel plates are placed in the pile holes. The bottom of the foundation pit is connected to pile columns, and the inner cavity of the foundation pit is provided with pile foundations and brackets. The upper end surface of the pile column is connected to the pile foundation, and the upper end of the pile foundation is connected to a pier column, and the bracket is arranged above the pile foundation.

[0008] A layer of waterproof geotextile is laid on the water-facing slope of the island-building platform, and a plurality of reinforced gabions are placed on the waterproof geotextile.

[0009] The pile hole passes through the island building platform, the riverbed and the landslide body in sequence, and the length of the steel plate is greater than the length of the pile hole.

[0010] A concrete layer is laid at the bottom of the inner cavity of the foundation pit.

[0011] The upper and lower end surfaces of the pile foundation are both provided with steel meshes, and the steel meshes are connected to the bracket through connecting rods.

[0012] The beneficial effects of the utility model are:

[0013] 1. The island-building platform can effectively resist the scouring of the weir by river water, and improve the water-stopping and anti-seepage effects; the island-building platform, landslide body and subsidence are connected in series through pile holes to effectively control the displacement of the landslide body; the steel plate is supported by the bracket to improve the steel plate's anti-deformation ability, thereby improving the water-stopping effect; the upper steel mesh of the pile foundation is connected to the lower area of ​​the bracket with a connecting rod, which can save steel buried in the concrete, and can achieve the effect of saving materials, preventing water from returning to the foundation pit and preventing collapse.

[0014] 2. By placing reinforced gabions on the waterproof geotextile, the dam body can be effectively protected against river water erosion, thereby improving the water-stopping and anti-seepage effects.

[0015] 3. Grouting and concrete bottom sealing are carried out in the lower area of ​​the steel plate in the pile foundation pit, which effectively controls the backflow of river water into the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 Plan layout for deep foundation pit construction;

[0018] Figure 3 It is a schematic diagram of the connection between the pile hole and the steel plate;

[0019] As shown in the figure: 1- riverbed; 2- island platform; 3- landslide body; 4- foundation pit; 5- pile hole; 6- steel plate; 7- pile column; 8- pile foundation; 9- pier column; 10- bracket; 11- waterproof geotextile; 12- reinforced gabion; 13- concrete layer; 14- connecting rod; 15- submerged soil; 16- river water. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figures 1 to 3 As shown, a riverbed deep foundation pit structure for constructing a landslide body in water includes an island-building platform 2 arranged above the riverbed 1 and a landslide body 3 arranged below the riverbed 1. The upper end surface of the island-building platform 2 is provided with a foundation pit 4, and a plurality of pile holes 5 are evenly distributed on the edge of the foundation pit 4. Steel plates 6 are placed in the pile holes 5. The bottom of the foundation pit 4 is connected to a pile column 7, and the inner cavity of the foundation pit 4 is provided with a pile foundation 8 and a bracket 10. The upper end surface of the pile column 7 is connected to the pile foundation 8, and the upper end of the pile foundation 8 is connected to a pier column 9. The bracket 10 is arranged above the pile foundation 8.

[0022] A layer of waterproof geotextile 11 is laid on the water-facing slope of the island-building platform 2 , and a plurality of reinforced gabions 12 are placed on the waterproof geotextile 11 .

[0023] The pile hole 5 passes through the island building platform 2 , the riverbed 1 and the landslide body 3 in sequence, and the length of the steel plate 6 is greater than the length of the pile hole 5 .

[0024] A concrete layer 13 is laid at the bottom of the inner cavity of the foundation pit 4 .

[0025] The upper and lower end surfaces of the pile foundation 8 are both provided with steel meshes, and the steel meshes are connected to the bracket 10 via a connecting rod 14 .

[0026] The pile hole 5 is filled with graded crushed stone of clay.

[0027] Filling is carried out on the surface of the riverbed 1 to form an island-building platform 6, and a layer of waterproof geotextile 11 is laid on the water-facing slope of the island-building platform 6. A plurality of reinforced gabions 12 are placed on the waterproof geotextile 11. The reinforced gabions 12 press the waterproof geotextile 11 onto the island-building platform 6 to prevent the waterproof geotextile 11 from shifting. The island-building platform 6 and the waterproof geotextile 11 are combined together to effectively resist the scouring of the weir by the river water and improve the water-stopping and anti-seepage effects.

[0028] Using GPS positioning, after the rotary drill sequentially jumps to drive pile holes 5, multiple steel plates 5 are immediately inserted and driven. The steel plates 5 are tightly engaged with each other. In the vertical direction, the steel plates 5 isolate the foundation pit 4 from the island platform 2, the landslide body 3 and the subsidence 15. The graded gravel 5 containing clay is filled in the hole seam, and the lower area of ​​the steel plate 6 is reinforced by grouting. The island platform 2, the landslide body 3 and the subsidence 15 are connected in series through the pile holes 5, which effectively controls the displacement of the landslide body 3, improves the water-stopping effect of the support structure, and enhances the deformation resistance of the steel plate.

[0029] The upper and lower supports 10 are used to implement the method of digging and supporting during the excavation of the deep foundation pit. The bottom of the foundation pit 4 is sealed with waterproof concrete 9. In the horizontal direction, the lower area of ​​the steel sheet piles of the foundation pit is grouted and sealed with waterproof concrete 9, thereby isolating the foundation pit 4 from the landslide body 3 and the subsidence 15. Furthermore, the inner cavity of the foundation pit 4 is completely isolated from the external environment, effectively controlling the river water 16 from returning to the foundation pit.

[0030] The steel mesh of the lower layer of the pile foundation 8 is placed on the top of the pile column 7, and the steel mesh of the upper layer of the pile foundation 8 is connected to the lower area of ​​the bracket 10 by a connecting rod 14, which can save steel buried in the concrete. After the foundation construction is completed and accepted, the upper pier column 9 is constructed.

[0031] The island-building platform 2 is used to effectively resist the scouring of the weir body by the river water 16, thereby improving the water-stopping and anti-seepage effects; the island-building platform 2, the landslide body 3 and the subsidence 15 are connected in series through the pile hole 5, thereby effectively controlling the displacement of the landslide body; the steel plate 6 is supported by the bracket 10, thereby improving the deformation resistance of the steel plate 6 and thus improving the water-stopping effect; the upper steel mesh of the pile foundation 8 is connected to the lower area of ​​the bracket by a connecting rod 14, which can save steel buried in the concrete, and can achieve the effects of saving materials, preventing water from flowing back into the foundation pit 4 and preventing collapse.

[0032] By placing the reinforced gabion 12 on the waterproof geotextile 11, the dam body can be effectively protected against scouring by river water, thereby improving the water-stopping and anti-seepage effects.

[0033] By grouting the lower area of ​​the steel plate 6 in the pile hole 5 and sealing the bottom with a concrete layer 13, the backflow of river water into the foundation pit is effectively controlled.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A riverbed deep foundation pit structure for constructing a landslide body in water, comprising an island-building platform (2) arranged above the riverbed (1) and a landslide body (3) arranged below the riverbed (1), characterized in that: The upper end surface of the island building platform (2) is provided with a foundation pit (4), and a plurality of pile holes (5) are evenly distributed on the sides of the foundation pit (4), and steel plates (6) are placed in the pile holes (5). The bottom of the foundation pit (4) is connected to a pile column (7), and the inner cavity of the foundation pit (4) is provided with a pile foundation (8) and a bracket (10), the upper end surface of the pile column (7) is connected to the pile foundation (8), and the upper end of the pile foundation (8) is connected to a pier column (9), and the bracket (10) is arranged above the pile foundation (8).

2. A riverbed deep foundation pit structure for constructing landslide bodies in water as claimed in claim 1, characterized in that: A layer of waterproof geotextile (11) is laid on the water-facing slope of the island-building platform (2), and a plurality of reinforced gabions (12) are placed on the waterproof geotextile (11).

3. A riverbed deep foundation pit structure for constructing landslide bodies in water as claimed in claim 1, characterized in that: The pile hole (5) passes through the island building platform (2), the riverbed (1) and the landslide body (3) in sequence, and the length of the steel plate (6) is greater than the length of the pile hole (5).

4. A riverbed deep foundation pit structure for constructing landslide bodies in water as claimed in claim 1, characterized in that: A concrete layer (13) is laid on the bottom of the inner cavity of the foundation pit (4).

5. A riverbed deep foundation pit structure for constructing landslide bodies in water as claimed in claim 1, characterized in that: The upper and lower end surfaces of the pile foundation (8) are both provided with steel mesh sheets, and the steel mesh sheets are connected to the bracket (10) via a connecting rod (14).

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