CN108560545B - Construction method for preventing hole collapse of rotary digging pile and hole collapse preventing device - Google Patents
Construction method for preventing hole collapse of rotary digging pile and hole collapse preventing device Download PDFInfo
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- CN108560545B CN108560545B CN201810505147.4A CN201810505147A CN108560545B CN 108560545 B CN108560545 B CN 108560545B CN 201810505147 A CN201810505147 A CN 201810505147A CN 108560545 B CN108560545 B CN 108560545B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention relates to a construction method for preventing a hole collapse of a rotary digging pile and a hole collapse prevention device, comprising the following steps of constructing the rotary digging pile at a set position; when the rotary excavating pile is constructed to the area where hole collapse easily occurs, excavating a set distance to the area where hole collapse easily occurs; providing a cylinder body with the outer diameter smaller than the caliber of the rotary digging pile; placing the barrel into the rotary excavating pile, wherein the bottom of the barrel is placed in an area where hole collapse is prone to occurring, and an annular gap is formed between the periphery of the barrel and the side wall of the rotary excavating pile; pouring concrete into the annular gap to form a section of retaining wall structure on the side wall of the rotary excavating pile; taking out the barrel from the rotary digging pile, continuously digging the rotary digging pile downwards to a set distance, putting the barrel into the rotary digging pile again, pouring to form a new protective wall structure, and repeating the steps until the rotary digging pile passes through an area where hole collapse easily occurs; and excavating the rotary excavating pile until the construction of the rotary excavating pile is completed.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction method for preventing a hole collapse of a rotary digging pile and a hole collapse prevention device.
Background
The rotary digging pile generally refers to a pile type constructed by a rotary digging drilling machine, and is called a rotary digging bored pile for short in engineering. Because of using mechanical operation, the requirement on the number of workers is not high, and great labor cost can be saved. After the hole is formed by the rotary excavator, the problems of low hole forming rate, hole shrinkage, slag inclusion, excessive thick sediment at the bottom of the pile and the like are easily caused under the geological condition of a high-water-level water-rich sand layer. The sand content of the water-rich sand layer reaches more than 30 percent, the porosity ratio is large, the water content is large, and the water-rich sand layer has the characteristics of large fluidity, small bearing capacity, poor self-stability and the like. The water-rich sand layer is easy to be settled due to the displacement of soil body generated by excavation.
When the hole collapse of the rotary excavating pile is carried out, concrete is backfilled to the hole collapse part in the traditional method, the backfilling method wastes the concrete, and the construction efficiency is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a construction method for preventing a hole collapse of a rotary digging pile and a hole collapse prevention device, and solves the problems of concrete waste and low construction efficiency in the prior art.
The technical scheme for realizing the purpose is as follows:
the invention provides a construction method for preventing a rotary digging pile from collapsing, which comprises the following steps:
constructing a rotary digging pile at a set position;
when the rotary excavating pile is constructed to the area where hole collapse easily occurs, excavating a set distance to the area where hole collapse easily occurs;
providing a cylinder body with the outer diameter smaller than the caliber of the rotary digging pile;
placing the barrel into the rotary excavating pile, wherein the bottom of the barrel is placed in the area where the hole collapse is prone to occur, and an annular gap is formed between the periphery of the barrel and the side wall of the rotary excavating pile;
pouring concrete into the annular gap to form a section of retaining wall structure on the side wall of the rotary excavating pile;
taking the barrel out of the rotary digging pile, continuously digging the rotary digging pile downwards to a set distance, putting the barrel into the rotary digging pile again, pouring to form a section of new retaining wall structure, and repeating the steps until the rotary digging pile passes through the area where hole collapse is easy to occur; and
and excavating the rotary excavating pile until the construction of the rotary excavating pile is completed.
The construction method for preventing the hole collapse of the rotary digging pile is further improved in that the central shaft of the cylinder body is overlapped with the central shaft of the rotary digging pile in the process of inserting the cylinder body into the rotary digging pile.
The construction method for the rotary digging pile anti-collapse hole is further improved in that the transverse sectional area from the top to the bottom of the cylinder body is gradually reduced.
The construction method for the rotary excavating pile anti-collapse hole is further improved in that concrete is poured to the top end of the barrel in the process of pouring the concrete in the annular gap.
The construction method for the rotary digging pile anti-collapse hole is further improved in that the top end of the cylinder body is provided with the sealing cover.
The construction method for the rotary digging pile anti-collapse hole is further improved in that the sealing cover is a conical cover.
The construction method for the rotary digging pile anti-collapse hole is further improved in that the top end of the barrel is provided with a connecting ring.
The invention also provides a hole collapse prevention device for the construction method of the rotary digging pile hole collapse prevention, which comprises the following steps:
the outer diameter of the cylinder is smaller than the caliber of the rotary digging pile, the cylinder is inserted into the rotary digging pile and is positioned in an area where hole collapse is easy to occur, and an annular gap is reserved between the cylinder and the side wall of the rotary digging pile; and
and a section of retaining wall structure poured in the annular gap.
The hole collapse prevention device for the construction method of the rotary digging pile hole collapse prevention is further improved in that the top end of the cylinder body is provided with the sealing cover.
The hole collapse prevention device for the construction method of the rotary digging pile hole collapse prevention is further improved in that the top end of the cylinder body is provided with the connecting ring.
The construction method for preventing the hole collapse of the rotary digging pile and the hole collapse preventing device have the beneficial effects that:
according to the invention, the barrel is placed in the rotary digging pile and in the area where the hole collapse is easy to occur, concrete is poured into an annular gap reserved between the rotary digging pile and the barrel to form a section of wall protecting structure to prevent the hole collapse, namely the concrete wall protecting structure is formed in a small range around the rotary digging pile, the hole collapse is prevented, the barrel occupies a certain space in the process of pouring concrete, the problem of waste caused by pouring concrete in the whole hole collapse is avoided, resources are saved, and the construction efficiency is improved. The barrel can be taken out after the retaining wall structure is formed, the downward excavation is continued, the pile is dug, the barrel can be used again, and the installation is convenient.
Drawings
FIG. 1 is a cross-sectional view of a construction state of the rotary excavating pile anti-collapse hole construction method.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a schematic view of the anti-collapse hole device of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, a cross-sectional view of a construction state of the construction method for preventing collapse of a rotary excavation pile according to the present invention is shown. Fig. 2 is a top view of fig. 1. As shown in fig. 1 and 2, the construction method of the rotary excavating pile collapse preventing hole comprises the following steps:
constructing the rotary digging pile 10 at the set position;
when the rotary excavating pile 10 is constructed to the area where hole collapse easily occurs, excavating a set distance to the area where hole collapse easily occurs;
providing a cylinder body 20 with the outer diameter smaller than the caliber of the rotary digging pile 10;
placing the cylinder 20 into the rotary excavating pile 10, wherein the bottom of the cylinder 20 is placed in an area where hole collapse is prone to occur, and an annular gap is formed between the periphery of the cylinder 20 and the side wall of the rotary excavating pile 10;
pouring concrete into the annular gap to form a section of retaining wall structure on the side wall of the rotary excavating pile 10;
taking the barrel body 20 out of the rotary excavating pile 10, continuously excavating the rotary excavating pile 10 downwards to a set distance, putting the barrel body 20 into the rotary excavating pile 10 again, pouring to form a new retaining wall structure, and repeating the steps until the rotary excavating pile 10 passes through an area where hole collapse is easy to occur;
and excavating the rotary excavating pile 10 until the construction of the rotary excavating pile 10 is completed.
According to the invention, the barrel is placed in the rotary digging pile and in the area where the hole collapse is easy to occur, and concrete is poured into an annular gap reserved between the rotary digging pile and the barrel to form a section of wall protecting structure to prevent the hole collapse, namely the concrete wall protecting structure is formed in a small range around the rotary digging pile, so that the hole collapse is prevented, the barrel occupies a certain space in the process of pouring concrete, the problem of waste caused by pouring concrete in the whole anti-collapse hole is avoided, resources are saved, and the construction efficiency is improved. The barrel can be taken out after the retaining wall structure is formed, the downward excavation is continued, the pile is dug, the barrel can be used again, and the installation is convenient.
As a preferred embodiment of the construction method for preventing the hole collapse of the rotary excavation pile, in this embodiment, the region where the hole collapse is likely to occur mainly includes a water-rich sand layer geological region and a backfill soil region. The sand content of the water-rich sand layer reaches more than 30 percent, the porosity ratio is large, the water content is large, and the water-rich sand layer has the characteristics of large fluidity, small bearing capacity, poor self-stability and the like. The water-rich sand layer is easy to be settled due to the displacement of soil body generated by excavation. The backfilling refers to returning the filled soil after completing the engineering below the ground such as foundation in the engineering construction, so the backfilling also has the characteristics of small bearing capacity, poor self-stability and the like, and is easy to cause hole collapse and the like. The area prone to hole collapse is not limited to this, and other soil layers with poor self-stability are also included.
As a preferred embodiment of the construction method for preventing the collapse hole of the rotary excavation pile, the central axis of the cylinder 20 is overlapped with the central axis of the rotary excavation pile 10 in the process of inserting the cylinder 20 into the rotary excavation pile 10, so that the width of each part of the annular gap reserved between the cylinder 20 and the side wall of the rotary excavation pile 10 is uniform, and the poor effect of preventing the collapse hole due to the uneven thickness of the wall protection structure 30 formed by the subsequent pouring is prevented.
Specifically, the cylinder 20 is stably hoisted to the position right above the rotary digging pile 10, the cylinder 20 is slowly placed into the part, needing to be backfilled, of the rotary digging pile 10, the distance between the cylinder 20 and the side wall of the rotary digging pile 10 is strictly controlled, and the problem that the cylinder 20 collides with the side wall of the rotary digging pile 10 to damage the rotary digging pile 10 in the descending process of the cylinder 20 is solved.
As a preferred embodiment of the construction method for preventing the hole collapse of the rotary excavating pile, the transverse sectional area from the top to the bottom of the cylinder body 20 is gradually reduced, so that the cylinder body is conveniently pulled upwards and taken out in the following process. In the process of inserting the cylinder 20 into the rotary digging pile 10, the top end of the cylinder 20 is lower than the top end of the rotary digging pile 10. The length of the cylinder 20 is smaller than the depth of the rotary digging pile 10, so that the material cost for manufacturing the cylinder 20 is low, and the cylinder 20 is convenient to move and install.
As a preferred embodiment of the construction method for preventing the hole collapse of the rotary excavating pile of the present invention, concrete is poured to the top end of the cylinder 20 during the process of pouring concrete in the annular gap. Namely, a section of retaining wall structure 30 is formed at the bottom of the rotary digging pile 10 by pouring so as to reinforce and support the bottom of the rotary digging pile 10 and prevent hole collapse. The length of the barrel 20 and the depth of the retaining wall structure 30 are determined according to the requirement of the rotary excavating pile 10.
As a preferred embodiment of the construction method for preventing the hole collapse of the rotary excavating pile, referring to fig. 3, a schematic diagram of the hole collapse preventing device of the invention is shown. As shown in fig. 1 to 3, a sealing cap 21 is provided at the top end of the cylinder 20. In the present embodiment, the sealing cover 21 is a cone-shaped cover.
The top end of the barrel 20 is provided with a connecting ring 22 for connecting with a tower crane and hoisting and moving the barrel 20. In this embodiment, there are 4 connecting rings 22, and 4 connecting rings 22 are symmetrically arranged, so that the balance of the barrel 20 is ensured in the process of hoisting the barrel 20 conveniently.
Specifically, after the truck transports the processed barrel 20 to the site, the barrel 20 is stably lifted by using a steel wire rope and a tower crane, the center of gravity of the barrel 20 is determined during rope threading, the rope is firmly sleeved and hung, the barrel 20 is slowly lifted, and the balance of the barrel 20 must be kept. And then, stably hoisting the cylinder body 20 to the position right above the rotary excavating pile 10 by using a tower crane, slowly placing the cylinder body 20 into the part, needing to be backfilled, of the rotary excavating pile 10, strictly controlling the distance between the cylinder body 20 and the side wall of the rotary excavating pile 10, and avoiding the problem that the cylinder body 20 collides with the rotary excavating pile 10 in the descending process.
After the barrel 20 is placed, concrete is poured between the barrel 20 and the rotary excavating pile 10, after the concrete is initially set and an anti-collapse hole is formed, the barrel 20 is slowly hoisted, and then the barrel is placed to a specified position to be repeatedly used.
The invention also provides an anti-collapse hole device for the construction method of the anti-collapse hole of the rotary digging pile, which comprises a barrel body 20, wherein the outer diameter of the barrel body is smaller than the caliber of the rotary digging pile 10, the barrel body 20 is inserted into the rotary digging pile 10 and is positioned in an area where the collapse hole is easy to occur, and an annular gap is reserved between the barrel body 20 and the side wall of the rotary digging pile 10; and a section of retaining wall structure 30 cast in an annular gap.
The cylinder 20 is made of a steel plate, and the thickness of the steel plate is 3.6 mm. The pull ring on the periphery of the top is processed into a semicircular connecting ring 22 with the thickness of 20mm and the radius of 100mm, and the semicircular connecting ring is used as a hanging ring of the steel wire rope. And processing the cylinders 20 with different sizes in advance according to the size of the rotary digging pile on site.
As a preferred embodiment of the construction method for preventing the collapse of the rotary digging pile, the top end of the cylinder 20 is provided with a sealing cover 21. The top end of the cylinder 20 is provided with a connection ring 22.
The construction method and the hole collapse prevention device for the rotary digging pile have the beneficial effects that:
according to the invention, the barrel is placed in the rotary digging pile and in the area where the hole collapse is easy to occur, and concrete is poured into an annular gap reserved between the rotary digging pile and the barrel to form a section of wall protecting structure to prevent the hole collapse, namely the concrete wall protecting structure is formed in a small range around the rotary digging pile, so that the hole collapse is prevented, the barrel occupies a certain space in the process of pouring concrete, the problem of waste caused by pouring concrete in the whole anti-collapse hole is avoided, resources are saved, and the construction efficiency is improved. The barrel can be taken out after the retaining wall structure is formed, the downward excavation is continued, the pile is dug, the barrel can be used again, and the installation is convenient.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (9)
1. A construction method for preventing a hole collapse of a rotary digging pile is characterized by comprising the following steps:
constructing a rotary digging pile at a set position;
when the rotary excavating pile is constructed to the area where hole collapse easily occurs, excavating a set distance to the area where hole collapse easily occurs;
providing a cylinder with the outer diameter smaller than the caliber of the rotary excavating pile, wherein the transverse sectional area from the top to the bottom of the cylinder is gradually reduced;
placing the barrel into the rotary excavating pile, wherein the bottom of the barrel is placed in the area where the hole collapse is prone to occur, and an annular gap is formed between the periphery of the barrel and the side wall of the rotary excavating pile;
pouring concrete into the annular gap to form a section of retaining wall structure on the side wall of the rotary excavating pile;
taking the barrel out of the rotary digging pile, continuously digging the rotary digging pile downwards to a set distance, putting the barrel into the rotary digging pile again, pouring to form a section of new retaining wall structure, and repeating the steps until the rotary digging pile passes through the area where hole collapse is easy to occur; and
and excavating the rotary excavating pile until the construction of the rotary excavating pile is completed.
2. The construction method of the rotary excavating pile collapse preventing hole according to claim 1, characterized by superposing a central axis of the cylinder body and a central axis of the rotary excavating pile in the process of inserting the cylinder body into the rotary excavating pile.
3. The construction method for the rotary excavation pile collapse prevention hole as claimed in claim 1, wherein concrete is poured to the top end of the barrel body in the process of pouring the concrete in the annular gap.
4. The construction method of the rotary digging pile anti-collapse hole according to claim 1, characterized in that the top end of the cylinder body is provided with a sealing cover.
5. The construction method of the rotary excavating pile collapse preventing hole according to claim 4, wherein the sealing cover is a conical cover.
6. The construction method of the rotary digging pile collapse preventing hole according to claim 1, characterized in that the top end of the cylinder body is provided with a connecting ring.
7. A hole collapse prevention device for the construction method of the rotary excavation pile hole collapse prevention according to claim 1, characterized by comprising:
the outer diameter of the cylinder is smaller than the caliber of the rotary digging pile, the cylinder is inserted into the rotary digging pile and is positioned in an area where hole collapse is easy to occur, an annular gap is reserved between the cylinder and the side wall of the rotary digging pile, and the transverse sectional area from the top to the bottom of the cylinder is gradually reduced; and
and a section of retaining wall structure poured in the annular gap.
8. The hole collapse prevention device for the construction method of the rotary excavation pile hole collapse prevention according to claim 7, wherein a sealing cover is arranged at the top end of the barrel.
9. The hole collapse prevention device for the construction method of the rotary excavation pile hole collapse prevention according to claim 7, wherein a connecting ring is arranged at the top end of the cylinder.
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| CN201810505147.4A CN108560545B (en) | 2018-05-24 | 2018-05-24 | Construction method for preventing hole collapse of rotary digging pile and hole collapse preventing device |
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| CN201810505147.4A CN108560545B (en) | 2018-05-24 | 2018-05-24 | Construction method for preventing hole collapse of rotary digging pile and hole collapse preventing device |
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| CN108560545A CN108560545A (en) | 2018-09-21 |
| CN108560545B true CN108560545B (en) | 2020-10-27 |
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| CN109914415B (en) * | 2019-03-31 | 2020-11-13 | 莆田城厢振达宸贸易有限公司 | Telegraph pole burying and slurry spreading device based on spiral multidirectional expansion |
| CN110700247A (en) * | 2019-09-27 | 2020-01-17 | 中冶交通建设集团有限公司 | Construction method for cast-in-place pile to penetrate through quicksand layer |
| CN111395332B (en) * | 2020-03-30 | 2021-08-31 | 襄阳地质基础工程有限责任公司 | Rotary excavating and anchor cable construction method for hard rock stratum |
| CN115341533B (en) * | 2022-08-30 | 2023-08-11 | 中铁九桥工程有限公司 | Drilling construction method for easy-collapse stratum cast-in-situ pile |
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