Pile casing for rotary excavating cast-in-place pile and lowering device of pile casing

Abstract

The utility model discloses a pile casing for a rotary excavating cast-in-place pile and a lowering device of the pile casing, and relates to the technical field of cast-in-place pile construction equipment.The pile casing for the rotary excavating cast-in-place pile comprises a casing body, at least three guide rod sets and at least three push-pull rods, and the guide rod sets are arranged in the circumferential direction and axially connected to one end of the casing body in a sliding mode. The guide rod set comprises a sliding seat connected to the barrel in a sliding mode, a guide rod with one end rotationally connected to the sliding seat and a torsional spring installed on the sliding seat, the two ends of the torsional spring are fixedly connected to the sliding seat and the guide rod respectively, and the push-pull rod is connected to the other end of the barrel in a sliding mode. One end of each push-pull rod is fixedly connected to the corresponding sliding base, and the other end of each push-pull rod penetrates out of the barrel. The pile casing has the effect that the technical problem that in the process of lowering the pile casing into a pile hole, the swinging pile casing may scrape surface soil into the hole, a cushion layer is formed, and the axial perpendicularity of the pile casing is affected is solved.

Description

Technical Field

[0001] The present application relates to the technical field of bored pile construction equipment, and in particular to a casing for a rotary bored pile and a lowering device thereof. Background Art

[0002] The casing for rotary bored piles is usually a steel casing, which is placed at the mouth of the pile hole. It plays an important role in preventing the soil layer around the hole from collapsing during the drilling process and ensuring that the drilling operation can proceed smoothly. Generally speaking, the inner diameter of the casing should be 20 to 40 cm larger than the pile diameter.

[0003] Usually, as one of the simplified methods of lowering the steel casing, a pile hole with a width and depth that matches the diameter of the steel casing will be drilled at the pile hole mark. The casing will then be hoisted and lowered into the pile hole. After lowering and taking measurements of position, verticality, etc., rotary drilling can be carried out.

[0004] Compared with the prior art method (such as described in Chinese patent publication number CN116240884B) of using a sinking device to press the steel casing into the soil layer to a designed elevation, this lowering method is relatively simpler and faster, and can reduce the problems of the steel casing being damaged by axial extrusion and axial deviation due to force difference; however, in the process of lowering the casing into the pile hole in the above method, due to the swing of the casing, the casing may scrape the loose soil at the hole mouth into the hole, and pad the local part of the casing behind it, affecting the axial verticality of the casing. Utility Model Content

[0005] In order to improve the technical problem that during the process of lowering the casing into the pile hole, the swinging casing may scrape loose soil into the hole to form a cushion layer, thereby affecting the axial verticality of the casing, the present application provides a casing for a rotary bored cast-in-place pile and a lowering device thereof.

[0006] On the one hand, the present application provides a casing for a rotary bored pile, which adopts the following technical solution:

[0007] A casing for rotary bored piles comprises a cylinder body, at least three groups of guide rod groups which are circumferentially arranged and axially slidably connected to one end of the cylinder body, and at least three push-pull rods, the guide rod group comprising a sliding seat slidably connected to the cylinder body, a guide rod rotatably connected to the sliding seat at one end, and a torsion spring mounted on the sliding seat, the two ends of the torsion spring being respectively fixedly connected to the sliding seat and the guide rod, the push-pull rod being slidably connected to the other end of the cylinder body, and one end of each of the push-pull rods being respectively fixedly connected to each of the sliding seats, and the other end passing through the cylinder body.

[0008] Optionally, the other ends of the plurality of inclined guide rods are abutted against each other, and the abutment points are located on the central axis of the cylinder.

[0009] Optionally, a plurality of slide grooves are provided at one end of the cylinder, the slide grooves pass through the end side of the axial end of the cylinder, and the slide seat and the guide rod are both slidably connected to the slide grooves.

[0010] Optionally, a limit platform cooperating with the sliding seat is formed at the notch of the sliding groove.

[0011] Optionally, the notch of the slide groove is connected to a guide hole opening toward the central axis of the cylinder.

[0012] Optionally, a guide surface connected to the slide groove is provided on the hole wall of the guide hole.

[0013] Optionally, a plurality of insertion holes are provided at the other end of the cylinder, and a plurality of the push-pull rods are inserted into the insertion holes one by one.

[0014] Optionally, the push-pull rod includes a fixed rod with one end fixedly connected to the slide seat and a force rod with one end threadedly connected to the other end of the fixed rod, and the other end of the force rod extends out of the cylinder along the axial direction of the cylinder.

[0015] Optionally, the slide seat includes a clamping seat and a shaft rod with both ends fixedly connected to the clamping seat, one end of the guide rod is rotatably connected to the shaft rod, and the torsion spring is sleeved on the shaft rod.

[0016] On the other hand, the present application provides a casing lowering device for rotary bored piles, which adopts the following technical solution:

[0017] A device for lowering a casing for a rotary bored pile comprises the casing for the rotary bored pile.

[0018] In summary, this application includes the following beneficial technical effects:

[0019] A plurality of slide seats are slidably connected at the axial end of the cylinder, and a guide rod which can be controlled and rotated by a torsion spring is rotatably connected to the slide seat, so that the end of the guide rod extending out of the cylinder is inclined toward the central axis of the cylinder, forming an inclined state and a guiding effect, thereby guiding the cylinder into the pile hole, and during the shaking of the cylinder, the guide rod contacts the wall of the hole mouth of the pile hole, pushing the loose soil at the hole mouth outward to avoid scraping the loose soil into the hole, thereby improving the technical problem that the swinging casing may scrape the loose soil into the hole to form a cushion layer and affect the axial verticality of the casing during the process of lowering the casing into the pile hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axonometric view of a casing for rotary bored cast-in-place piles of the utility model, showing a usage state.

[0021] Figure 2 It is a partial cross-sectional view of a casing for rotary bored cast-in-place piles of the utility model.

[0022] Figure 3 yes Figure 2 Partial exploded view.

[0023] Figure 4 yes Figure 3 Enlarged view of part A.

[0024] Figure 5 yes Figure 3 Enlarged view of part B.

[0025] Explanation of the accompanying drawings: 1. Cylinder; 11. Slide groove; 12. Limiting platform; 13. Guide hole; 14. Guide surface; 15. Socket; 2. Sliding seat; 21. Clamping seat; 22. Shaft rod; 3. Guide rod; 4. Torsion spring; 5. Push-pull rod; 51. Fixed rod; 52. Force-applying rod. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-5 This application is described in further detail.

[0027] On the one hand, an embodiment of the present application discloses a casing for a rotary bored cast-in-place pile.

[0028] Reference Figures 1 to 4 A casing for a rotary bored pile comprises a barrel 1, at least three guide rod groups circumferentially arranged and axially slidably connected to one end of the barrel 1, and at least three push-pull rods 5. The guide rod group comprises a slide seat 2 slidably connected to the barrel 1, a guide rod 3 rotatably connected to the slide seat 2 at one end, and a torsion spring 4 installed on the slide seat 2. The two ends of the torsion spring 4 are respectively fixedly connected to the slide seat 2 and the guide rod 3. The push-pull rod 5 is slidably connected to the other end of the barrel 1, and one end of each push-pull rod 5 is respectively fixedly connected to each slide seat 2, and the other end passes through the barrel 1.

[0029] When the cylinder 1 is hoisted and installed, the slide 2 is pushed by the push-pull rod 5, so that the slide 2 and the guide rod 3 slide at the same time, and the other end of the guide rod 3 slides out of the cylinder 1, and under the action of the torsion spring 4, the other end of the guide rod 3 is inclined toward the central axis of the cylinder 1 to form an inclined state; during the hoisting process, the other ends of the multiple guide rods 3 that always maintain an inclined state under the action of the torsion spring 4 are first extended into the pile hole to form a guiding effect, guiding the cylinder 1 into the pile hole, and in the process of the cylinder 1 shaking, the guide rod 3 contacts the wall of the pile hole mouth, pushing the loose soil at the hole mouth outwards to avoid scraping the loose soil into the hole, thereby improving the technical problem that the swinging casing may scrape the loose soil into the hole to form a cushion layer during the process of lowering the casing into the pile hole, affecting the axial verticality of the casing.

[0030] The other ends of the multiple inclined guide rods 3 are abutted against each other, and the abutment point is located on the central axis of the cylinder 1. By abutting the multiple guide rods 3 at the same point, the inclination stability of the guide rods 3 is relatively improved to prevent further inclination during the collision between the inclined guide rods 3 and the pile hole wall, thereby affecting the use effect.

[0031] A plurality of slide grooves 11 are provided at one end of the cylinder 1, and the slide grooves 11 pass through the end side of the axial end of the cylinder 1. The slide seat 2 and the guide rod 3 are both slidably connected to the slide grooves 11, so that the sliding installation of the slide seat 2 can be realized through the slide grooves 11, and when the guide rod 3 is located in the slide grooves 11, the guide rod 3 can be hidden and the possibility of soil entering the slide grooves 11 can be reduced.

[0032] In the embodiment of the present application, the depth of the slide groove 11 is not less than the length of the guide rod 3 to ensure that the guide rod 3 can completely enter the cylinder body 1 to achieve the storage of the guide rod 3.

[0033] A limiting platform 12 that matches the slide seat 2 is formed at the notch of the slide slot 11 , so that the slide slot 11 forms a stepped groove structure, so that the limiting platform 12 forms a limiting effect on the sliding of the slide seat 2 to prevent the slide seat 2 from sliding out of the slide slot 11 .

[0034] The slot of the slide groove 11 is connected to a guide hole 13 opening toward the central axis of the cylinder 1 , and the guide hole 13 is connected to the limit platform 12 , so that when the slide seat 2 slides to the guide hole 13 , the guide rod 3 can be tilted under the action of the torsion spring 4 .

[0035] The hole wall of the guide hole 13 is provided with a guide surface 14 connected to the slide groove 11, so that when the slide seat 2 is pulled by the push-pull rod 5, the inclined guide rod 3 enters the slide groove 11, and the guide surface 14 is used to guide the guide rod 3, so that the guide rod 3 can smoothly return to the slide groove 11.

[0036] Reference Figure 3 and Figure 5 The other end of the cylinder 1 is provided with a plurality of insertion holes 15 , and a plurality of push-pull rods 5 are inserted into the insertion holes 15 one by one, and the insertion holes 15 are connected to the corresponding slide grooves 11 , so that the push-pull rods 5 can be installed through the insertion holes 15 .

[0037] Reference Figures 3 to 5 The slide seat 2 includes a clamping seat 21 and a shaft rod 22 with both ends fixedly connected to the clamping seat 21 , one end of the guide rod 3 is rotatably connected to the shaft rod 22 , and the torsion spring 4 is sleeved on the shaft rod 22 .

[0038] Specifically, the clamping seat 21 is in a “U” shape, two ends of the shaft 22 are fixedly connected to two arms of the clamping seat 21 , and one end of the push-pull rod 5 is fixedly connected to the closed end of the clamping seat 21 .

[0039] The push-pull rod 5 includes a fixed rod 51 with one end fixedly connected to the slide seat 2 and a force rod 52 with one end threadedly connected to the other end of the fixed rod 51 . The other end of the force rod 52 extends out of the cylinder 1 along the axial direction of the cylinder 1 .

[0040] Specifically, one end of the fixing rod 51 is fixedly connected to the closed end of the clamping seat 21. A threaded hole is provided at one end of the fixing rod 51, and one end of the force applying rod 52 is adapted and threadedly connected to the threaded hole of the fixing rod 51, so as to realize the detachable connection between the fixing rod 51 and the force applying rod 52 by threaded connection.

[0041] During use, disassembly can be achieved by threading the force rod 52 and the fixing rod 51 together to prevent the push-pull rod 5 extending out of the cylinder 1 from affecting the lifting operation.

[0042] On the basis of the above embodiment, the sum of the length of the fixing rod 51 and the length of the guide rod 3 is not greater than the length of the cylinder 1 to ensure that the fixing rod 51 does not extend out of the cylinder 1 when the guide rod 3 is retracted into the chute 11 .

[0043] On the other hand, an embodiment of the present application further discloses a device for lowering a casing for a rotary bored cast-in-place pile, comprising the above-mentioned casing for a rotary bored cast-in-place pile.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A casing for a rotary bored pile, comprising a casing (1), characterized in that: It also includes at least three groups of guide rod groups arranged circumferentially and axially slidably connected to one end of the cylinder (1) and at least three push-pull rods (5), the guide rod group including a slide seat (2) slidably connected to the cylinder (1), a guide rod (3) one end of which is rotatably connected to the slide seat (2), and a torsion spring (4) mounted on the slide seat (2), the two ends of the torsion spring (4) are respectively fixedly connected to the slide seat (2) and the guide rod (3), the push-pull rod (5) is slidably connected to the other end of the cylinder (1), and one end of each push-pull rod (5) is respectively fixedly connected to each slide seat (2), and the other end passes through the cylinder (1).

2. The casing for rotary bored pile according to claim 1, characterized in that: The other ends of the plurality of inclined guide rods (3) are in contact with each other, and the contact point is located on the central axis of the cylinder (1).

3. The casing for rotary bored pile according to claim 1, characterized in that: A plurality of slide grooves (11) are provided at one end of the cylinder (1), the slide grooves (11) extending through the end side of the axial end of the cylinder (1), and the slide seat (2) and the guide rod (3) are both slidably connected to the slide grooves (11).

4. The casing for rotary bored pile according to claim 3, characterized in that: A limiting platform (12) matching with the sliding seat (2) is formed at the notch of the sliding groove (11).

5. The casing for rotary bored pile according to claim 3, characterized in that: The notch of the slide groove (11) is connected to a guide hole (13) opening toward the central axis of the cylinder (1).

6. The casing for rotary bored pile according to claim 5, characterized in that: The hole wall of the guide hole (13) is provided with a guide surface (14) which is connected to the slide groove (11).

7. The casing for rotary bored pile according to claim 1, characterized in that: The other end of the cylinder (1) is provided with a plurality of insertion holes (15), and the plurality of push-pull rods (5) are inserted into the insertion holes (15) one by one.

8. The casing for rotary bored pile according to any one of claims 1 to 7, characterized in that: The push-pull rod (5) comprises a fixing rod (51) having one end fixedly connected to the slide seat (2) and a force rod (52) having one end threadedly connected to the other end of the fixing rod (51), the other end of the force rod (52) extending out of the cylinder (1) along the axial direction of the cylinder (1).

9. The casing for rotary bored pile according to any one of claims 1 to 7, characterized in that: The slide seat (2) comprises a clamping seat (21) and a shaft rod (22) with both ends fixedly connected to the clamping seat (21); one end of the guide rod (3) is rotatably connected to the shaft rod (22); and the torsion spring (4) is sleeved on the shaft rod (22).

10. A casing lowering device for rotary bored piles, characterized in that: It comprises a casing for rotary bored cast-in-place piles as described in any one of claims 1 to 9.

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