External supporting type immersed tube structure of immersed tube cast-in-place pile

Abstract

The utility model discloses an outer supporting type immersed tube structure of an immersed tube cast-in-place pile, which relates to the technical field of immersed tube cast-in-place piles and comprises an outer supporting tube body and a pile tip mounted on the outer supporting tube body and used for forming a pile hole. A plurality of exhaust joint filling holes which are used for exhausting when concrete is poured and enabling part of the concrete to overflow to fill a gap between a pile hole and an immersed tube are formed in the external supporting tube body, and an external expansion mechanism which is used for being inserted into the pile hole is arranged in the external supporting tube body. Through the arrangement of parts such as the pile tip, people can directly drive the outer supporting pipe body into soil to form a pile hole by utilizing piling equipment, and do not need to use the piling equipment to drive the pile hole, take out a piling tool in a pile and clean the pile hole additionally, so that the construction period is shortened; and the immersed tube can be expanded after piling, so that the connecting strength between the immersed tube and surrounding soil is improved, and the anti-settling and anti-outward-inclination performance of the cast-in-place pile is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe sinking cast-in-place piles, in particular to an externally supported pipe sinking structure of pipe sinking cast-in-place piles. Background Art

[0002] Pipe sinking pile is one of the many types of pile foundations in civil engineering. It uses a steel pipe (i.e. casing) that is compatible with the design size of the pile. After the pile tip is put on the end and sunk into the soil, a steel cage is hung in the casing, and then the pipe is vibrated or hammered while pouring concrete. The vibration during the pipe pulling is used to compact the concrete to form the required cast-in-place pile. Some of the pipe sinking piles will leave the casing in the pile hole to form an external support type protective pile barrel of the pipe sinking pile.

[0003] The patent with announcement number CN218291923U discloses "a kind of externally supported immersed tube structure of immersed tube bored pile, comprising a pile tip and a plurality of externally supported tube bodies, the externally supported tube bodies comprising a connecting pipe and an externally supported tube located at one end of the connecting pipe, the externally supported tube bodies comprising an upper connecting ring, a lower connecting ring and a plurality of deformable plates, the upper and lower ends of the deformable plates being respectively connected to the upper connecting ring and the lower connecting ring, each deformable plate forming a cylindrical shape; the upper connecting ring being welded to the lower end of the connecting pipe; the connection method of adjacent externally supported tube bodies is as follows: the upper end of the externally supported tube of the externally supported tube body located at the lower end is welded to the lower connecting ring of the externally supported tank body located at the upper end. The utility model has the advantages of being able to improve the anti-settling performance of bored piles, etc."

[0004] With regard to the above-mentioned related technologies, the inventor believes that due to the setting of the deformable plate, it is necessary to use piling drilling equipment to drill pre-cast pile holes during construction, then take out the piling tools from the pile holes, clean the pile holes, and then lower the immersed tube with the deformable plate into the pile hole. When lowering, it is necessary to pay attention that the deformable plate cannot be deformed by force. However, it takes time to use the equipment to drill the pile holes, take out the piling tools in the pile holes, and clean the pile holes, which prolongs the construction period. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model provides a submerged pipe cast-in-place pile external support type submerged pipe structure, and the specific technical scheme is as follows:

[0006] A pipe-sinking structure with external support for cast-in-place piles comprises an external support pipe body, a pile tip installed on the external support pipe body and used for opening a pile hole, a plurality of exhaust and caulking holes are opened in the external support pipe body for exhausting air when concrete is poured and allowing part of the concrete to overflow to fill the gap between the pile hole and the pipe-sinking structure, an external expansion mechanism is provided in the external support pipe body for inserting into the pile hole, the external expansion mechanism comprises a plurality of insertion rods slidably arranged in the external support pipe body, a conical end arranged at one end of the insertion rod, and a hemispherical block fixed at the other end of the insertion rod for abutting against a lowered steel cage so as to press the conical end and one end of the insertion rod into the soil of the pile hole.

[0007] By adopting the above technical solution and setting up components such as the pile tip, people can use piling equipment to directly drive the outer support tube into the soil to form a pile hole. There is no need to use additional piling equipment to drive the pile hole, remove the piling tools in the pile, and clean the pile hole, thereby shortening the construction period.

[0008] Optionally, a reinforcement frame is provided in the exhaust caulking hole of the outer support tube body, and the reinforcement frame includes horizontal bars and vertical bars fixed in the exhaust caulking hole in a crisscross manner.

[0009] By adopting the above technical solution, the reinforcement frame can reinforce the exhaust caulking hole.

[0010] Optionally, a plurality of limiting holes are opened in the outer support tube body, the insertion rod is slidably connected in the limiting holes of the outer support tube body, the hemispherical block is located inside the outer support tube body, and the outer wall of the hemispherical block is coated with reflective paint.

[0011] By adopting the above technical solution, when the steel cage is lowered, the cone end and one end of the plug rod will be pressed into the surrounding soil under the guidance of the arc surface of the hemisphere, thereby expanding the immersed tube outward.

[0012] Optionally, a positioning mechanism is provided in the outer support tube body for positioning the external expansion mechanism hidden in the outer support tube body during pipe sinking and piling. The positioning mechanism includes a positioning hole opened on the outer wall of the insertion rod, and a rubber block fixed in the limiting hole of the outer support tube body, and the rubber block is movably inserted in the positioning hole.

[0013] By adopting the above technical solution, after the rubber block is inserted into the positioning hole, the insertion rod, cone end and hemispherical block hidden in the immersed tube can be positioned and fixed, so that when the immersed tube is piled, the cone end will not be exposed from the outside of the outer support tube body and contact the surrounding soil, thereby increasing the resistance of the lower tube.

[0014] In summary, the present invention has at least one of the following beneficial effects:

[0015] 1. Through the arrangement of components such as pile tips, people can use piling equipment to directly drive the external support pipe body into the soil to form a pile hole. There is no need to use additional piling equipment to drill the pile hole, take out the piling tools in the pile and clean the pile hole, which shortens the construction period. The external expansion mechanism such as the insertion rod will not affect the piling process of the external support pipe body, and can expand the immersed pipe after piling to improve the connection strength between the immersed pipe and the surrounding soil, thereby improving the anti-settling and anti-outward tilt performance of the cast-in-place pile.

[0016] 2. Through the setting of the exhaust caulking hole, the air in the tube can be discharged when the concrete is poured into the outer support tube body, and part of the concrete can overflow to fill the gap between the pile hole and the immersed tube, thereby improving the connection strength between the cast-in-place pile and the surrounding soil. The reinforcing frame can strengthen the exhaust caulking hole. When the steel cage is lowered, the cone end and one end of the plug rod will be pressed into the surrounding soil under the guidance of the hemispherical arc surface, thereby expanding the immersed tube outward, which is convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the interior of the outer support tube body of the utility model;

[0019] Figure 3 The utility model Figure 2 A magnified view of the structure in the middle;

[0020] Figure 4 The utility model Figure 2 A magnified view of the structure in middle B.

[0021] Explanation of the reference numerals: 1. External support tube body; 11. Limiting hole; 2. Pile tip; 3. Exhaust filling hole; 31. Reinforcement frame; 32. Cross bar; 33. Vertical bar; 4. Insert rod; 41. Conical end; 42. Hemispherical block; 43. Positioning hole; 44. Rubber block. DETAILED DESCRIPTION

[0022] The following is combined with Figure 1-4 The utility model is described in further detail.

[0023] The utility model discloses a submerged pipe cast-in-place pile external support type submerged pipe structure, referring to Figure 1-2 , including an outer support tube body 1, and a pile tip 2 installed on the outer support tube body 1 and used for opening a pile hole. The outer support tube body 1 and the pile tip 2 constitute the existing inner sinking tube of the cast-in-place pile. After the outer support tube body 1 is pressed down by the piling equipment, it will drive the pile tip 2 to move downward to open the pile hole. The outer support tube body 1 is not taken out after the cast-in-place pile is formed, but forms an outer support type protective pile barrel on the outside of the cast-in-place pile.

[0024] Reference Figure 1-3 A plurality of exhaust caulking holes 3 are provided in the outer support tube body 1 for exhausting air when concrete is poured and allowing part of the concrete to overflow to fill the gap between the pile hole and the immersed tube. The exhaust caulking holes 3 can exhaust the air in the tube when concrete is poured into the outer support tube body 1, and allow part of the concrete to overflow out of the outer support tube body 1 through the exhaust caulking holes 3 to fill the gap between the pile hole and the immersed tube, thereby improving the connection strength between the cast-in-place pile and the surrounding soil.

[0025] Reference Figure 1-3A reinforcing frame 31 is provided in the exhaust caulking hole 3 of the outer support pipe body 1. The reinforcing frame 31 includes horizontal bars 32 and vertical bars 33 fixed in the exhaust caulking hole 3 in a crisscross manner. The reinforcing frame 31 composed of the horizontal bars 32 and the vertical bars 33 can reinforce the inside of the exhaust caulking hole 3, so that the exhaust caulking hole 3 is not easily deformed during the sinking of the pipe and piling.

[0026] Reference Figure 2 and Figure 4 The outer support tube body 1 is provided with an external expansion mechanism for inserting into the pile hole, and the external expansion mechanism includes a plurality of insertion rods 4 slidably arranged in the outer support tube body 1, a tapered end 41 arranged at one end of the insertion rod 4, and a hemispherical block 42 fixedly arranged at the other end of the insertion rod 4 for abutting against the lowered steel cage so as to press the tapered end 41 and one end of the insertion rod 4 into the soil of the pile hole. A plurality of limiting holes 11 are opened in the outer support tube body 1, and the insertion rod 4 is slidably connected in the limiting holes 11 of the outer support tube body 1. The outer support tube body 1 can limit the insertion rod 4 through the limiting holes 11. The tapered end 41 is tapered, so that the tapered tapered end 41 and one end of the insertion rod 4 are easier to insert into the surrounding soil after being squeezed.

[0027] Reference Figure 2 and Figure 4 The hemispherical block 42 is located inside the outer support tube body 1, which is convenient for the hemispherical block 42 to contact with the steel cage lowered into the outer support tube body 1. The outer wall of the hemispherical block 42 is coated with reflective paint. When lowering the steel cage, people can find the position of the hemispherical block 42 more quickly through the reflection of the reflective paint, which facilitates the contact between the lowered steel cage and the hemispherical block 42.

[0028] When the steel cage is lowered into the outer support pipe body 1, the bottom of the lowered steel cage will abut against the arc surface of the hemispherical block 42, and under the downward pressure of the steel cage and gravity, the hemispherical block 42 will be pressed toward the outside of the immersed tube, thereby pressing the cone end 41 and one end of the insertion rod 4 into the soil of the pile hole to expand the immersed tube outward, thereby improving the connection strength between the immersed tube and the surrounding soil, thereby improving the anti-settlement and anti-outward tilt performance of the cast-in-place pile.

[0029] Reference Figure 2 and Figure 4 A positioning mechanism is provided in the outer support tube body 1 for positioning the inner and outer expansion mechanism hidden in the outer support tube body 1 during the sinking of the pipe. The positioning mechanism includes a positioning hole 43 provided on the outer wall of the insertion rod 4, and a rubber block 44 fixed in the limiting hole 11 of the outer support tube body 1. The rubber block 44 is movably inserted in the positioning hole 43. After the rubber block 44 is inserted into the positioning hole 43, the insertion rod 4, the cone end 41 and the hemispherical block 42 hidden in the sinking pipe can be positioned and fixed, so that the cone end 41 will not be exposed from the outside of the outer support tube body 1 and contact with the surrounding soil during the sinking of the pipe, thereby increasing the resistance of the lower pipe.

[0030] When the hemispherical block 42 is pressed toward the outside of the immersed tube, the rubber block 44 will be deformed under the force and will break away from the positioning hole 43, or the rubber block 44 will be directly broken from the limiting hole 11 under excessive force, so that the rubber block 44 can no longer position and fix the insertion rod 4 and other components, making it easier for the cone end 41 and the insertion rod 4 to be pressed into the soil of the pile hole under the force.

[0031] The implementation principle of a submerged pipe cast-in-place pile external support submerged pipe structure of the utility model is:

[0032] When in use, the outer support pipe body 1, after being pressed down by the external piling equipment, will drive the pile tip 2 to move downward to open the pile hole, and then people can lower the steel cage into the outer support pipe body 1, and the bottom of the lowered steel cage will abut against the arc surface of the hemispherical block 42, and under the downward pressure of the steel cage and gravity, the hemispherical block 42 is pressed toward the outside of the sinking pipe, so that the cone end 41 and one end of the insertion rod 4 are pressed into the soil of the pile hole, so as to expand the sinking pipe outward and improve the connection strength between the sinking pipe and the surrounding soil;

[0033] Then pour concrete into the outer support tube body 1 placed in the steel cage and compact it. At this time, the exhaust caulking holes 3 can exhaust the air in the tube when the concrete is poured, and make part of the concrete overflow from the outer support tube body 1 through the exhaust caulking holes 3 to fill the gap between the pile hole and the immersed tube. When the concrete solidifies, the outer support tube body 1 and other components will form an immersed tube cast-in-place pile.

[0034] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A cast-in-place immersed pipe structure with external support, comprising an external support pipe body (1), a pile tip (2) mounted on the external support pipe body (1) and used for opening a pile hole, characterized in that: The outer support tube body (1) is provided with a plurality of venting and filling holes (3) for venting when concrete is poured and allowing part of the concrete to overflow to fill the gap between the pile hole and the immersed tube. The outer support tube body (1) is provided with an expansion mechanism for inserting into the pile hole. The expansion mechanism comprises a plurality of insertion rods (4) slidably arranged in the outer support tube body (1), a conical end (41) arranged at one end of the insertion rod (4), and a hemispherical block (42) fixed at the other end of the insertion rod (4) for abutting against a lowered steel cage so as to press the conical end (41) and one end of the insertion rod (4) into the soil of the pile hole.

2. The externally supported immersed tube structure of the immersed tube cast-in-place pile according to claim 1, characterized in that: A reinforcing frame (31) is provided in the exhaust caulking hole (3) of the outer support tube body (1).

3. The externally supported immersed tube structure of the immersed tube cast-in-place pile according to claim 2 is characterized in that: The reinforcing frame (31) comprises horizontal bars (32) and vertical bars (33) which are fixedly arranged in a crisscross manner in the exhaust caulking hole (3).

4. The externally supported immersed tube structure of the immersed tube cast-in-place pile according to claim 1, characterized in that: A plurality of limiting holes (11) are provided in the outer support tube body (1), and the insertion rod (4) is slidably connected in the limiting holes (11) of the outer support tube body (1).

5. The externally supported immersed tube structure of the immersed tube cast-in-place pile according to claim 1, characterized in that: The hemispherical block (42) is located inside the outer support tube body (1), and the outer wall of the hemispherical block (42) is coated with reflective paint.

6. The externally supported immersed tube structure of the immersed tube cast-in-place pile according to claim 4, characterized in that: The outer support tube body (1) is provided with a positioning mechanism for positioning the inner and outer expansion mechanism hidden in the outer support tube body (1) during pipe sinking and piling.

7. The externally supported immersed tube structure of the immersed tube cast-in-place pile according to claim 6, characterized in that: The positioning mechanism comprises a positioning hole (43) formed on the outer wall of the insertion rod (4), and a rubber block (44) fixed in a limiting hole (11) of the outer support tube body (1).

8. The externally supported immersed tube structure of the immersed tube cast-in-place pile according to claim 7, characterized in that: The rubber block (44) is movably inserted into the positioning hole (43).

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