Anti-sloughing device for dry operation cast-in-situ bored pile

Abstract

The invention discloses a dry operation cast-in-situ bored pile hole collapse prevention device which comprises a hole collapse prevention cage, a narrow part is arranged at the bottom of the hole collapse prevention cage, a wide part is installed on the upper side of the narrow part, meanwhile, a top seat is fixedly installed at the top of the wide part, and a first limiting piece is fixedly installed on the outer side of the top seat; a second limiting piece is fixedly installed on one side of the first limiting piece, and a third limiting piece is fixedly installed on the other side of the first limiting piece. According to the hole collapse prevention device for the dry operation cast-in-situ bored pile, the whole hole collapse prevention cage is conical, and when the hole collapse prevention cage with the narrow lower portion and the wide upper portion is placed into a drilled hole, due to the fact that the lower portion is narrow, the hole collapse prevention cage can penetrate through a narrow hole opening and possibly existing obstacles more easily; when the anti-collapse hole cage descends gradually, the wider part of the upper part can enter the hole smoothly, so that the resistance and blockage phenomena in the descending process are reduced, the construction efficiency is improved, the friction between the anti-collapse hole cage and the hole wall is reduced, the damage to the hole wall is reduced, and the possibility of hole collapse is further reduced.

Description

Technical Field

[0001] The invention relates to the field of drilling construction equipment, in particular to a dry operation bored pile anti-collapse device. Background Art

[0002] The purpose of dry bored piles is mainly to provide strong vertical bearing capacity: buildings, bridges and other structures usually generate large vertical loads, which need to be transferred to the stable soil layer underground through the foundation. Dry bored piles penetrate into the soil layer with high bearing capacity, such as dense sand layer, pebble layer or bedrock layer, through their long pile body, effectively transferring the load of the upper structure to the deep soil layer, thereby providing strong vertical support for the structure.

[0003] When drilling in dry operation, the soil in the stratum where the hole is located is loose and has poor stability, such as silt sand, fine sand and other soils, and the bonding force between particles is weak, which is easy to lose balance and collapse during the drilling process. Therefore, a dry operation bored pile anti-collapse device is urgently needed to solve the above defects. Summary of the invention

[0004] The object of the present invention is to provide a dry bored pile anti-collapse device to solve the defects mentioned in the above background technology.

[0005] To achieve the above-mentioned purpose, a dry-operation bored pile anti-collapse device is provided, comprising an anti-collapse cage, wherein a narrow portion is arranged at the bottom of the anti-collapse cage, and a wide portion is installed on the upper side of the narrow portion, and a top seat is fixedly installed on the top of the wide portion, and a first limiting plate is fixedly installed on the outer side of the top seat, a second limiting plate is fixedly installed on one side of the first limiting plate, and a third limiting plate is fixedly installed on the other side of the first limiting plate.

[0006] Preferably, the anti-collapse cage is composed of a plurality of groups of weft strips and ribs, and the weft strips and ribs are vertically arranged, and the outer sides of the plurality of groups of ribs are uniformly welded with the plurality of groups of weft strips.

[0007] Preferably, the anti-collapse cage is arranged in a cone shape as a whole, and the weft bars on the anti-collapse cage are arranged in a ring shape, and the ribs on the anti-collapse cage are arranged in a straight line shape.

[0008] Preferably, the diameters of the multiple groups of weft strips increase uniformly from bottom to top, and the multiple groups of ribs are all inclined.

[0009] Preferably, the top seat is a circular structure made of metal material, and a plurality of groups of ribs are evenly interspersed and fixed on the top seat, and the distances between two adjacent groups of weft strips and ribs are consistent.

[0010] Preferably, the first limit plate, the second limit plate and the third limit plate are evenly installed on the outer side of the circumference of the top seat, and the first limit plate, the second limit plate and the third limit plate are centrally symmetrical structures about the central axis of the anti-collapse cage. At the same time, the first limit plate, the second limit plate and the third limit plate are all fan-shaped, and three groups of inserts are evenly welded on the bottom of the first limit plate, the second limit plate and the third limit plate.

[0011] Preferably, the anti-collapse hole cage is inserted into the inside of the dry operation drill hole, and the top of the anti-collapse hole cage is covered on the upper surface of the drill hole by the first limiting piece, the second limiting piece and the third limiting piece.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The anti-collapse cage of the present invention has a lower center of gravity in the borehole through the conical design, and has better stability; during the installation and concrete pouring process, it is not easy to tilt or shift, ensuring that the steel cage is always in the correct position, thereby ensuring the verticality and bearing capacity of the pile, and avoiding the occurrence of borehole collapse; 2. The present invention adopts a cone-shaped anti-collapse hole cage. When the anti-collapse hole cage is placed in a drill hole, it is easier to pass through the narrow hole opening and possible obstacles due to its narrow lower part. As the anti-collapse hole cage is gradually lowered, the wider upper part can also smoothly enter the hole, reducing the resistance and jamming during the lowering process, improving the construction efficiency, reducing the friction between the anti-collapse hole cage and the hole wall, reducing the damage to the hole wall, and further reducing the possibility of hole collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Bottom view of Figure 3 for Figure 1 A top view of Figure 4 for Figure 1 sectional view of .

[0014] Numbers in the figure: 1, wide part; 2, narrow part; 3, weft; 4, rib; 5, first limiting piece; 51, second limiting piece; 52, third limiting piece; 53, inserting drill; 6, top seat; 7, anti-collapse cage. DETAILED DESCRIPTION

[0015] See also Figure 1-4The present invention provides a dry-operation bored pile anti-collapse device, comprising an anti-collapse cage 7, a narrow portion 2 is provided at the bottom of the anti-collapse cage 7, and a wide portion 1 is installed on the upper side of the narrow portion 2, and a top seat 6 is fixedly installed on the top of the wide portion 1, and a first limiting piece 5 is fixedly installed on the outer side of the top seat 6, a second limiting piece 51 is fixedly installed on one side of the first limiting piece 5, and a third limiting piece 52 is fixedly installed on the other side of the first limiting piece 5.

[0016] Working principle: When in use, after the dry drilling is completed, the anti-collapse hole cage 7 is inserted into the inside of the borehole, and the top of the anti-collapse hole cage 7 is covered on the upper surface of the borehole by the first limiting piece 5, the second limiting piece 51 and the third limiting piece 52. The bottoms of the first limiting piece 5, the second limiting piece 51 and the third limiting piece 52 are evenly welded with three groups of inserted drills 53. The nine groups of inserted drills 53 are inserted into the soil on the upper surface of the borehole to support and fix the inner wall of the borehole. After the conical anti-collapse hole cage 7 is placed in the borehole, the narrower narrow part 2 at the bottom can fit the hole wall more closely, providing a better support for the hole wall. Concentrated supporting force; with the increase of depth, the pressure of the soil also increases accordingly. This close fit helps to resist the lateral pressure of the soil on the hole wall and reduce the risk of hole collapse; the wider upper part 1 can disperse the pressure from above to a certain extent, so that the support of the entire steel cage to the hole wall is more uniform and stable; the anti-collapse hole cage 7 is conical in design, so that its center of gravity in the borehole is lower and the stability is better; during the installation and concrete pouring process, it is not easy to tilt or shift, ensuring that the steel cage is always in the correct position, thereby ensuring the verticality and bearing capacity of the pile, and avoiding the occurrence of borehole collapse.

[0017] As a preferred embodiment, the anti-collapse cage 7 is composed of multiple groups of weft strips 3 and rib strips 4, and the weft strips 3 and rib strips 4 are vertically arranged, and multiple groups of weft strips 3 are evenly welded to the outer sides of multiple groups of rib strips 4.

[0018] As a preferred embodiment, the anti-collapse cage 7 is overall conical, and the weft strips 3 on the anti-collapse cage 7 are annular, and the rib strips 4 on the anti-collapse cage 7 are straight.

[0019] As a preferred embodiment, the diameters of the multiple groups of weft strips 3 increase uniformly from bottom to top, and the multiple groups of ribs 4 are all inclined.

[0020] As a preferred embodiment, the top seat 6 is a circular structure made of metal material, and a plurality of groups of ribs 4 are evenly interspersed and fixed on the top seat 6, and the distances between two adjacent groups of weft strips 3 and ribs 4 are consistent.

[0021] As a preferred embodiment, the first limiting plate 5, the second limiting plate 51 and the third limiting plate 52 are evenly installed on the outer side of the circumference of the top seat 6, and the first limiting plate 5, the second limiting plate 51 and the third limiting plate 52 are centrally symmetrical structures about the central axis of the anti-collapse cage 7. At the same time, the first limiting plate 5, the second limiting plate 51 and the third limiting plate 52 are all fan-shaped, and three groups of inserts 53 are evenly welded on the bottom of the first limiting plate 5, the second limiting plate 51 and the third limiting plate 52.

[0022] As a preferred embodiment, the anti-collapse cage 7 is inserted into the inside of the dry drilling hole, and the top of the anti-collapse cage 7 is covered on the upper surface of the drilling hole by the first limiting plate 5, the second limiting plate 51 and the third limiting plate 52.

[0023] The anti-collapse hole cage 7 is conical in shape as a whole. When the anti-collapse hole cage 7, which is narrow at the bottom and wide at the top, is put into the drill hole, it is easier to pass through the narrow hole opening and possible obstacles due to the narrow lower part; as the anti-collapse hole cage 7 is gradually lowered, the wider upper part can also enter the hole smoothly, reducing the resistance and jamming during the lowering process, improving the construction efficiency, reducing the friction between the anti-collapse hole cage 7 and the hole wall, reducing the damage to the hole wall, and further reducing the possibility of hole collapse.

Claims

1. A dry bored pile anti-collapse device, comprising an anti-collapse cage (7), characterized in that: The anti-collapse hole cage (7) is provided with a narrow portion (2) at the bottom, and a wide portion (1) is installed on the upper side of the narrow portion (2), and a top seat (6) is fixedly installed on the top of the wide portion (1), and a first limiting piece (5) is fixedly installed on the outer side of the top seat (6), a second limiting piece (51) is fixedly installed on one side of the first limiting piece (5), and a third limiting piece (52) is fixedly installed on the other side of the first limiting piece (5).

2. A dry bored pile anti-collapse device according to claim 1, characterized in that: The anti-collapse cage (7) is composed of a plurality of groups of weft strips (3) and rib strips (4), wherein the weft strips (3) and rib strips (4) are arranged vertically, and the outer sides of the plurality of groups of rib strips (4) are uniformly welded with the plurality of groups of weft strips (3).

3. A dry bored pile anti-collapse device according to claim 2, characterized in that: The anti-collapse cage (7) is arranged in a cone shape as a whole, and the weft strips (3) on the anti-collapse cage (7) are arranged in a ring shape, while the rib strips (4) on the anti-collapse cage (7) are arranged in a straight line shape.

4. A dry bored pile anti-collapse device according to claim 2, characterized in that: The diameters of the multiple groups of weft strips (3) increase evenly from bottom to top, and the multiple groups of ribs (4) are all arranged obliquely.

5. The dry bored pile anti-collapse device according to claim 1, characterized in that: The top seat (6) is a circular structure made of metal material, and a plurality of groups of ribs (4) are evenly interspersed and fixed on the top seat (6), and the distances between two adjacent groups of weft strips (3) and ribs (4) are consistent.

6. A dry bored pile anti-collapse device according to claim 5, characterized in that: The first limiting piece (5), the second limiting piece (51) and the third limiting piece (52) are evenly installed on the outer side of the circumference of the top seat (6), and the first limiting piece (5), the second limiting piece (51) and the third limiting piece (52) are centrally symmetrical structures about the central axis of the anti-collapse hole cage (7), and the first limiting piece (5), the second limiting piece (51) and the third limiting piece (52) are all arranged in a fan shape, and three groups of inserts (53) are evenly welded on the bottom of the first limiting piece (5), the second limiting piece (51) and the third limiting piece (52).

7. A dry bored pile anti-collapse device according to claim 6, characterized in that: The anti-collapse hole cage (7) is inserted into the interior of the dry operation drill hole, and the top of the anti-collapse hole cage (7) is covered on the upper surface of the drill hole through the first limiting piece (5), the second limiting piece (51) and the third limiting piece (52).

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