Frost heaving prevention device for pile foundation

Abstract

The utility model discloses a pile foundation frost heaving prevention device which comprises foundation soil, a pre-buried groove is formed in the foundation soil, a first protection plate is connected in the pre-buried groove in a sliding mode, an installation groove is formed in the top of the first protection plate, a second protection plate is arranged in the installation groove, and the second protection plate is connected with the first protection plate in a sliding mode. A sleeve is arranged on the inner wall of the first protection plate, a filling cavity is formed between the sleeve and the first protection plate, and a filling material is arranged in the filling cavity. The first protection plate is placed in the pre-buried groove of the foundation soil, the second protection plate is installed in the installation groove, the first protection plate and the second protection plate form the protection periphery, the foundation soil protection pile foundation is separated, meanwhile, the filling cavity formed by the protection periphery and the sleeve is filled with inorganic filler, geofoam and other materials, and the protection effect is good. Frost heaving is prevented through the closed water blocking and waterproof functions, and the pile foundation adopts the pedestal pile, so that the anti-pulling capacity of the pile body is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation anti-frost heave technology, specifically a pile foundation anti-frost heave device. Background Technology

[0002] A pile foundation anti-frost heave device is a device used to prevent pile foundations from being damaged by frost heave in cold regions. It mainly protects the pile foundation by separating the foundation soil and releasing the frost heave effect, thus avoiding damage to the pile foundation caused by the freezing and expansion of the soil.

[0003] According to publication number CN218148478U, a pile foundation anti-frost heave device and pile foundation system include: multiple first protective plates inserted into the foundation soil; the multiple first protective plates are spliced ​​together and surround the perimeter of the pile foundation, and adjacent first protective plates are movably connected along their height direction. This utility model provides a pile foundation anti-frost heave device and pile foundation system that uses multiple first protective plates to separate the foundation soil around the pile foundation; and utilizes the sliding motion between the first protective plates along their height direction to release the frost heave effect of the foundation soil, thereby achieving the purpose of protecting the pile foundation. This utility model provides a pile foundation anti-frost heave device with the functions of separating the foundation soil and releasing frost heave effect. It also has the advantages of simple structure, convenient installation, wide applicability, no requirement for large-scale excavation and replacement, and can effectively protect the ecological environment of ecologically fragile areas such as plateau regions.

[0004] The first protective plate can separate the foundation soil to protect the pile foundation. However, since the outer protective perimeter is made up of multiple first protective plates, moisture in the foundation soil can easily enter the outer perimeter through the gaps at the joints and come into contact with the pile foundation, thus causing frost heave. Utility Model Content

[0005] The purpose of this utility model is to provide a pile foundation anti-frost heave device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pile foundation anti-frost heave device, comprising foundation soil, an embedded groove formed inside the foundation soil, a first protective plate slidably connected inside the embedded groove, an installation groove formed at the top of the first protective plate, a second protective plate arranged inside the installation groove, a sleeve provided on the inner wall of the first protective plate, a filling cavity formed between the sleeve and the first protective plate, a filling material arranged inside the filling cavity, a pile shaft slidably connected inside the sleeve, and an enlarged bottom fixedly connected to the bottom end of the pile shaft.

[0007] As a further preferred embodiment of this technical solution, the first protective plate and the second protective plate form a protective perimeter, the sleeve is located inside the protective perimeter, the filling material is composed of inorganic filler, geofoam, etc., and the enlarged bottom adopts a frustum structure.

[0008] As a further preferred embodiment of this technical solution, a fixing groove is provided on the top of the foundation soil, a plug-in rod is provided inside the fixing groove, a rubber gasket is movably sleeved on the surface of the plug-in rod, a threaded rod is fixedly connected to the top of the plug-in rod, and a fixing nut is threadedly connected to the surface of the threaded rod.

[0009] As a further preferred embodiment of this technical solution, the number of fixing slots is four, the number of plug-in rods corresponds to the number of fixing slots, the bottom end of the plug-in rod adopts a conical structure, and the threaded rod is located at the top of the foundation soil.

[0010] As a further preferred embodiment of this technical solution, an annular sandbox is provided at the top of the foundation soil, and a pre-embedded pipe is fixedly connected to the bottom of the annular sandbox. A pressure relief groove is opened in the middle of the pre-embedded pipe, and fine sand is placed inside the pre-embedded pipe and the annular sandbox.

[0011] As a further preferred embodiment of this technical solution, the bottom of the annular sandbox is provided with an installation hole, the installation hole is adapted to the plug rod, the inner wall of the annular sandbox is in contact with the sleeve, and the number of pre-embedded pipes is four, the four pre-embedded pipes are equidistantly distributed around the circumference, and the pre-embedded pipes are located inside the filling material.

[0012] As a further preferred embodiment of this technical solution, the top of the annular sandbox is provided with a limiting groove, the inside of the limiting groove is provided with an annular cover, and the top of the annular cover is fixedly connected with a lifting lug.

[0013] This utility model provides a frost heave prevention device for pile foundations, which has the following beneficial effects:

[0014] (1) This utility model places the first protective plate in the pre-embedded trench of the foundation soil and installs the second protective plate in the installation trench, so that the first and second protective plates form a protective perimeter, thereby separating the foundation soil to protect the pile foundation. At the same time, inorganic filler, geofoam and other materials are filled in the filling cavity formed by the protective perimeter and the sleeve. The frost heave is prevented by sealing and water blocking and waterproofing functions. The pile foundation adopts the expanded bottom pile, thereby enhancing the pull-out resistance of the pile body.

[0015] (2) This utility model pre-sets a fixing groove on the foundation soil and inserts the plug rod into the fixing groove. The plug rod adopts a spiral structure to increase the connection stability with the foundation soil. After the position of the plug rod is fixed, the annular sand box is installed on the plug rod through the installation hole. The rubber gasket is put on the surface of the plug rod, and the fixing nut is installed on the threaded rod with a tool to fix the annular sand box on the foundation soil. The rubber gasket ensures the overall sealing. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the first and second protective plates of this utility model;

[0019] Figure 4 This is a schematic diagram of the internal structure of the annular sandbox of this utility model.

[0020] In the diagram: 1. Foundation soil; 2. Embedded trench; 3. First protective plate; 4. Installation trench; 5. Second protective plate; 6. Sleeve; 7. Filling cavity; 8. Filling material; 9. Pile shaft; 10. Enlarged bottom; 11. Fixing trench; 12. Insert rod; 13. Rubber gasket; 14. Threaded rod; 15. Fixing nut; 16. Annular sand box; 17. Embedded pipe; 18. Pressure relief trench; 19. Fine sand; 20. Limiting trench; 21. Annular cover; 22. Lifting lug. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a technical solution: such as Figure 1 and Figure 4 As shown in this embodiment, a pile foundation anti-frost heave device includes foundation soil 1, a pre-embedded groove 2 is provided inside the foundation soil 1, a first protective plate 3 is slidably connected inside the pre-embedded groove 2, an installation groove 4 is provided on the top of the first protective plate 3, a second protective plate 5 is provided inside the installation groove 4, a sleeve 6 is provided on the inner wall of the first protective plate 3, a filling cavity 7 is formed between the sleeve 6 and the first protective plate 3, a filling material 8 is provided inside the filling cavity 7, a pile shaft 9 is slidably connected inside the sleeve 6, and an enlarged bottom 10 is fixedly connected to the bottom end of the pile shaft 9.

[0023] By placing the first protective plate 3 in the pre-embedded trench 2 of the foundation soil 1 and installing the second protective plate 5 in the installation trench 4, the first protective plate 3 and the second protective plate 5 form a protective perimeter, thereby separating the foundation soil 1 to protect the pile foundation. At the same time, inorganic filler, geofoam and other materials are filled into the filling cavity 7 formed by the protective perimeter and the sleeve 6. The frost heave is prevented by sealing and water blocking and waterproofing functions. In addition, the pile foundation adopts 10 piles with enlarged bottom, thereby enhancing the pull-out resistance of the pile body.

[0024] The first protective plate 3 and the second protective plate 5 form the outer perimeter of the protection. The sleeve 6 is located inside the outer perimeter of the protection. The filling material 8 is composed of inorganic fillers, geofoam, etc. The enlarged bottom 10 adopts a frustum structure.

[0025] A fixing groove 11 is provided on the top of the foundation soil 1. A plug-in rod 12 is provided inside the fixing groove 11. A rubber gasket 13 is movably sleeved on the surface of the plug-in rod 12. A threaded rod 14 is fixedly connected to the top of the plug-in rod 12. A fixing nut 15 is threadedly connected to the surface of the threaded rod 14.

[0026] By pre-setting a fixing groove 11 on the foundation soil 1 and inserting the plug rod 12 into the fixing groove 11, the plug rod 12 adopts a spiral structure to increase the connection stability with the foundation soil 1. After the position of the plug rod 12 is fixed, the annular sand box 16 is installed on the plug rod 12 through the mounting hole. The rubber gasket 13 is put on the surface of the plug rod 12, and the fixing nut 15 is installed on the threaded rod 14 using a tool, thereby fixing the annular sand box 16 on the foundation soil 1. The rubber gasket 13 ensures the overall sealing.

[0027] There are four fixing slots 11, and the number of plug rods 12 corresponds to the number of fixing slots 11. The bottom end of the plug rod 12 adopts a conical structure, and the threaded rod 14 is located at the top of the foundation soil 1.

[0028] An annular sandbox 16 is installed at the top of the foundation soil 1. A pre-embedded pipe 17 is fixedly connected to the bottom of the annular sandbox 16. A pressure relief groove 18 is opened in the middle of the pre-embedded pipe 17. Fine sand 19 is placed inside the pre-embedded pipe 17 and the annular sandbox 16.

[0029] The bottom of the annular sandbox 16 is provided with an installation hole, which is compatible with the plug rod 12. The inner wall of the annular sandbox 16 is in contact with the sleeve 6. There are four pre-embedded pipes 17, which are equidistantly distributed around the circumference. The pre-embedded pipes 17 are located inside the filling material 8.

[0030] The top of the annular sandbox 16 has a limiting groove 20, and the inside of the limiting groove 20 is provided with an annular cover 21. The top of the annular cover 21 is fixedly connected with a lifting lug 22.

[0031] This utility model provides a frost heave prevention device for pile foundations, the specific working principle of which is as follows:

[0032] In use, the pile foundation consisting of pile shaft 9 and enlarged base 10 is installed in the pre-embedded groove 2. The first protective plate 3 is placed in the pre-embedded groove 2 of the foundation soil 1, and the second protective plate 5 is installed in the installation groove 4, so that the first protective plate 3 and the second protective plate 5 form a protective outer perimeter, thereby separating the foundation soil 1 and protecting the pile foundation. The sleeve 6 is sleeved on the surface of the pile shaft 9. At the same time, the filling cavity 7 formed by the protective outer perimeter and the sleeve 6 is filled with inorganic filler, geofoam and other materials to prevent frost heave through the airtight water-blocking and waterproof functions. The plug rod 12 is inserted into the fixing groove 11. The annular sand box 16 is installed on the plug rod 12 through the mounting hole. The rubber gasket 13 is placed on the surface of the plug rod 12, and the fixing nut 15 is installed on the threaded rod 14 using a tool, thereby fixing the annular sand box 16 to the foundation soil 1. At the same time, the pre-embedded pipe 17 is inserted into the filling material 8. Fine sand 19 is added to the annular sand box 16 and flows into the pre-embedded pipe 17. When the foundation soil 1 is under pressure, the fine sand 19 in the pre-embedded pipe 17 moves upward into the annular sand box 16 under the pressure, thereby releasing the pressure and improving the protection of the pile foundation.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pile foundation anti-frost heave device, comprising foundation soil (1), characterized in that: The foundation soil (1) has an embedded groove (2) inside, and a first protective plate (3) is slidably connected inside the embedded groove (2). An installation groove (4) is opened on the top of the first protective plate (3). A second protective plate (5) is installed inside the installation groove (4). A sleeve (6) is installed on the inner wall of the first protective plate (3). A filling cavity (7) is formed between the sleeve (6) and the first protective plate (3). A filling material (8) is installed inside the filling cavity (7). A pile shaft (9) is slidably connected inside the sleeve (6). An enlarged bottom (10) is fixedly connected to the bottom of the pile shaft (9).

2. The anti-frost heave device for pile foundations according to claim 1, characterized in that: The first protective plate (3) and the second protective plate (5) form a protective perimeter, the sleeve (6) is located inside the protective perimeter, and the expanded bottom (10) adopts a frustum structure.

3. The anti-frost heave device for pile foundations according to claim 1, characterized in that: A fixing groove (11) is provided on the top of the foundation soil (1). A plug rod (12) is provided inside the fixing groove (11). A rubber gasket (13) is movably sleeved on the surface of the plug rod (12). A threaded rod (14) is fixedly connected to the top of the plug rod (12). A fixing nut (15) is threadedly connected to the surface of the threaded rod (14).

4. The anti-frost heave device for pile foundations according to claim 3, characterized in that: The number of fixed grooves (11) is four, and the number of plug rods (12) corresponds to the number of fixed grooves (11). The bottom end of the plug rod (12) adopts a conical structure, and the threaded rod (14) is located at the top of the foundation soil (1).

5. A pile foundation anti-frost heave device according to claim 1, characterized in that: An annular sandbox (16) is provided at the top of the foundation soil (1), and a pre-embedded pipe (17) is fixedly connected to the bottom of the annular sandbox (16). A pressure relief channel (18) is provided in the middle of the pre-embedded pipe (17), and fine sand (19) is provided inside the pre-embedded pipe (17) and the annular sandbox (16).

6. A pile foundation anti-frost heave device according to claim 5, characterized in that: The bottom of the annular sandbox (16) is provided with an installation hole, which is compatible with the plug rod (12). The inner wall of the annular sandbox (16) is in contact with the sleeve (6). There are four pre-embedded pipes (17), which are equidistantly distributed around the circumference. The pre-embedded pipes (17) are located inside the filling material (8).

7. A pile foundation anti-frost heave device according to claim 5, characterized in that: The top of the annular sandbox (16) has a limiting groove (20), and the inside of the limiting groove (20) is provided with an annular cover (21). The top of the annular cover (21) is fixedly connected with a lifting lug (22).

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