CN114164842B - Wall protection device for bored pile and working method - Google Patents
Wall protection device for bored pile and working method Download PDFInfo
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- CN114164842B CN114164842B CN202111580129.0A CN202111580129A CN114164842B CN 114164842 B CN114164842 B CN 114164842B CN 202111580129 A CN202111580129 A CN 202111580129A CN 114164842 B CN114164842 B CN 114164842B
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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
- E02D2200/00—Geometrical or physical properties
- E02D2200/14—Geometrical or physical properties resilient or elastic
- E02D2200/146—Springs
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0001—Rubbers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0026—Metals
- E02D2300/0029—Steel; Iron
- E02D2300/0034—Steel; Iron in wire form
Abstract
The invention discloses a wall protection device for a bored pile and a working method thereof, which solve the problems of easy collapse of a slurry wall protection and long construction period of a pre-buried steel casing in the prior art, and have the beneficial effects of realizing rapid construction of the protection of the bored pile hole, saving labor and construction time, and the concrete scheme is as follows: the utility model provides a protection wall device for bored concrete pile, includes first protection casing, sets up the second in the first protection casing and protects the casing, and first protection casing is pre-buried to be fixed in the ground on stake hole top, and the lower half section of first protection casing is in deep into the stake hole, and the second protects the casing and includes the multisection, and the internal diameter of second protection casing is adjustable under the exogenic action, and each section of second protection casing can be with first protection casing or last section of second protection casing block connection.
Description
Technical Field
The invention relates to the field of foundation construction of building and bridge engineering piles, in particular to a wall protection device for a bored pile and a working method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In building and bridge engineering, bored pile construction is widely applied, and a drilling process in bored pile construction is an important construction process. When the bored pile is drilled, the collapse of the hole wall is an important engineering defect, and the existing bored pile construction mainly adopts a slurry wall-protecting drilling or pre-buried steel pile-protecting construction process.
The inventor finds that the existing construction process has a plurality of defects, mud with certain requirements is required to be prepared in advance for mud wall protection drilling, certain environmental pollution can be caused in the construction process, meanwhile, the mud wall protection effect is also insufficient, and a certain hole wall collapse problem exists; the construction process of the pre-buried steel pile casing needs to drive the steel pile casing into the soil foundation in advance, and the construction period is prolonged and the cost is increased in the construction process.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide the wall protection device for the bored pile, which can effectively reduce construction cost, mud concentration and usage amount and reduce environmental pollution on the premise of providing a wall protection function.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the utility model provides a protection wall device for bored concrete pile, includes first protection casing, sets up the second in the first protection casing and protects the casing, and first protection casing is pre-buried to be fixed in the ground on stake hole top, and the lower half section of first protection casing is in deep into the stake hole, and the second protects the casing and includes the multisection, and the internal diameter of second protection casing is adjustable under the exogenic action, and each section of second protection casing can be with first protection casing or last section of second protection casing block connection.
According to the wall protecting device, the first protecting cylinder is positioned on the upper half section of the pile hole, the second protecting cylinder comprises multiple sections, so that the inner diameter of the second protecting cylinder can be increased after the second protecting cylinder is positioned below the second protecting cylinder in place through gradually lowering the second protecting cylinder with the reduced diameter, and the first protecting cylinder and the multiple sections of second protecting cylinders can form an integral structure, so that the wall protecting is carried out on the pile hole.
The wall protection device for the bored pile comprises a cylindrical surface, wherein the cylindrical surface is fixed on a metal net, an elastic hoop is fixed on the metal net, a locking buckle is arranged at one end of the elastic hoop, a locking pin is connected with the elastic hoop and the locking buckle so that the second cylindrical surface is formed into a cylindrical shape, and the stability of the second cylindrical surface in the placing process is ensured due to the arrangement of the locking pin.
According to the wall protection device for the bored pile, the cylindrical surface is made of geotextile, and the cylindrical surface is matched with the metal net, so that the strength of the second protective cylinder is guaranteed.
According to the wall protection device for the bored pile, the elastic hoops are bent at the two sides of the elastic hoops at the set positions to form the guide grooves, the two sides of the guide grooves are respectively provided with the pin holes for the locking pins to pass through, and the locking buckles are also provided with the pin holes for the locking pins to pass through;
one end of the locking pin is provided with an opening to be connected with a lifting rope, the other end of the locking pin can be bent, the lifting rope is connected with the locking pin, and when each section of second pile casing reaches a corresponding position, the locking pin is pulled out from the locking buckle through the lifting rope by external force, so that the second pile casing is gradually opened to be attached to the side wall of the pile hole.
According to the wall protection device for the bored pile, the sections of the second protection barrels are provided with the elastic hoops at a plurality of positions in the circumferential direction, the interval between every two adjacent elastic hoops of each section of the second protection barrel is set to be a set distance, and all locking pins of each section of the second protection barrel are connected to the lifting rope.
According to the wall protection device for the bored pile, part or all of the second protective cylinders are provided with the guide rail and the sliding groove, the sliding groove is formed through the sliding groove body, and the guide rail is connected with the sliding groove body through the locking piece, so that the guide rail is arranged on the outer side of the second protective cylinder, and the sliding groove body is arranged on the inner side of the second protective cylinder;
the inner side of the first pile casing is also provided with a chute body to form a chute, the guide rail arranged on each section of second pile casing is matched with the chute of the first pile casing or the last section of second pile casing, and when the second pile casing is lowered to a set position, the adjacent two chute bodies are in clamping connection, so that the second pile casing is in clamping connection with the first pile casing or the last section of second pile casing.
According to the wall protection device for the bored pile, the length of the chute body at each second pile casing is longer than that of the guide rail connected with the chute body.
According to the wall protection device for the bored pile, one end of the chute body is provided with the clamping groove, the other end of the chute body is provided with the lug matched with the clamping groove of the other chute body, and the lug is provided with one part of the chute;
the chute body is arranged at the bump in an open way, one end of the clamping groove is an open end, and two sides of the open end of the clamping groove are inwards bent.
According to the wall protection device for the bored pile, the opening is formed in at least one side of the guide rail, the elastic block is arranged at the opening, the elastic block is extruded in the process that the guide rail moves downwards along the chute, the second protection barrels of all sections can be stably lowered, when the guide rail moves to the clamping groove of the chute body, the elastic block can be ejected, but the elastic block is extruded again due to the bending of the opening end of the clamping groove, so that the guide rail is smoothly separated from the bottom end of the chute, and one end of the chute body is conveniently clamped in the clamping groove by the convex block;
the elastic block comprises an elastic piece connected with the guide rail, and the elastic piece is connected with the rigid body;
one side of the rigid body, which is far away from the elastic piece, is fixed with a rubber pad, and the rubber pad slows down the descending speed of the second protective cylinder when the second protective cylinder descends along the sliding groove.
In a second aspect, the invention also provides a working method of the wall protection device for the bored pile, which comprises the following steps:
the first pile casing is pre-buried on the ground at the top end of the pile hole, and the lower half section of the first pile casing penetrates into the pile hole;
releasing the first section of the second casing downwardly along the inner wall of the first casing;
when the first section of second casing is placed at the bottom of the first casing, the inner diameter of the second casing is increased, the first section of second casing is gradually attached to the hole wall, and the first section of second casing and the first casing form a whole under the action of external force;
and repeatedly completing the lowering of all the second casings.
The beneficial effects of the invention are as follows:
1) According to the invention, through the provision of the integral device, the first pile casing is positioned at the upper half section of the pile hole, the second pile casing comprises a plurality of sections, so that the inner diameter of the second pile casing can be increased after the second pile casing is positioned at the lower part in place step by step, the first pile casing and the plurality of sections of second pile casings can form an integral structure, thereby protecting the pile hole, the first pile casing and the second pile casing effectively protect the pile hole, and the problem of collapse is fully avoided.
2) According to the invention, the pile hole is supported on site by matching the multi-section second pile casing and the first pile casing, and a longer steel pile casing is not required to be driven in advance, so that the construction efficiency and the construction quality of the bored pile are improved, the engineering construction cost is reduced, the use amount of slurry is reduced, the pollution to the environment is reduced, and the standardized construction of the wall protection operation can be realized; the rapid construction of the protection of the bored pile hole is realized, and the manpower and the construction time are saved;
compared with the traditional steel pile casing construction, the whole construction reduces the usage amount of the steel pile casing and the vibration operation of the steel pile casing, and reduces the engineering cost.
3) According to the invention, the metal net is used for supporting the cylinder surface to form the second protection cylinder, so that the elastic hoop is arranged on the second protection cylinder, the support of the metal net on the cylinder surface can be effectively ensured, and the strength of the second protection cylinder is ensured.
4) According to the invention, through the arrangement of the locking pin, the locking pin is matched with the locking buckle, and the second protection barrel is kept stable in the process of releasing each section of the second protection barrel; when each section of second pile casing reaches the corresponding position, the external force can pull out the locking pin from the locking buckle through the lifting rope, so that the second pile casing is gradually opened to be attached to the side wall of the pile hole.
5) According to the invention, the sliding grooves are formed in the inner sides of the first protection barrels, the guide rails are arranged in the outer sides of the second protection barrels of all the sections, and the sliding groove bodies are arranged in the inner sides of part of the second protection barrels to form the sliding grooves, so that the guide rails can move downwards along the sliding grooves in the descending process of the second protection barrels of all the sections, and the smooth descending of the second protection barrels is ensured; and the spout body sets up lug and draw-in groove, can be when each section of second protects a section of thick bamboo to the suitable position down, and the spout body block of two adjacent protection a section of thick bamboo for all protect a section of thick bamboo to connect as an organic whole structure, fully guarantee the quality of protecting the wall.
6) According to the invention, the elastic blocks are arranged on the side parts of the guide rails, so that the descending speed of each section of second pile casing can be ensured, the stable descending of each section of second pile casing can be ensured, and the descending operation quality of the pile casings can be ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a front view of a wall protection device for a bored pile according to one or more embodiments of the present invention.
Fig. 2 is a schematic view of a section of a second casing in a wall guard for a bored pile according to one or more embodiments of the present invention.
Fig. 3 is a partial schematic view of a section of a second casing deployed in a wall guard for a bored pile according to one or more embodiments of the present invention.
Fig. 4 is a schematic view of a retaining wall device for bored piles according to one or more embodiments of the present invention, wherein the retaining wall device is formed of a resilient steel hoop section.
Fig. 5 is a schematic view showing engagement of a locking buckle and a locking pin in a wall protecting device for a bored pile according to one or more embodiments of the present invention.
Fig. 6 is a schematic view of a guide rail and a chute body in a dado device for a bored pile according to one or more embodiments of the present invention.
Fig. 7 is a schematic view of a chute body in a dado device for bored piles according to one or more embodiments of the present invention.
Fig. 8 is a schematic view of a guide rail in a wall protection device for a bored pile according to one or more embodiments of the present invention.
Fig. 9 is a schematic view of a projectile in a wall protection device for cast-in-situ bored piles according to one or more embodiments of the present invention.
In the figure: the mutual spacing or dimensions are exaggerated for the purpose of showing the positions of the various parts, and the schematic illustration is only schematic.
1. The first pile casing, 2, the chute, 3, the steel cable, 4 and the second pile casing;
401. a cylinder face, 402, a metal net, 403, an upper elastic steel hoop, 404 and a middle elastic steel hoop;
405. locking pins 406, locking buckles 407 and guiding protruding blocks;
201. the device comprises a spring block, 202, a guide rail, 203, bolts, 204, a chute body, 205, a lug, 206 and a clamping groove;
20101. rubber pad 20102, metal body 20103, spring.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular forms also are intended to include the plural forms unless the present invention clearly dictates otherwise, and furthermore, it should be understood that when the terms "comprise" and/or "include" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
as described in the background art, the mud wall protection device in the prior art has the problems of environmental pollution, long construction period and high cost in other construction processes, and the invention provides the wall protection device for the bored pile in order to solve the technical problems.
In an exemplary embodiment of the present invention, referring to fig. 1, a wall protection device for a bored pile includes a first casing 1, a second casing is disposed in the first casing 2, the first casing is pre-buried and fixed on the ground at the top end of a pile hole, the lower half of the first casing extends into the pile hole, a chute 2 is disposed in the first casing, and the chute 2 is disposed along the length direction of the first casing.
The first pile casing 1 is a rigid pile casing, and can be specifically a steel pile casing, the first pile casing has a set length, and the pile hole top is protected by the first pile casing, so that the stability of the pile hole top is facilitated, and the second pile casing is facilitated to be lowered.
Further, the second casing 4 has an adjustable inner diameter, and includes multiple sections, as shown in fig. 2, guide rails are respectively disposed on the outer sides of the sections of the second casings, a portion of the second casings 4 (except for the bottommost second casing) is also provided with a chute 2 that is matched with the first casing or the previous section of the second casing, the chute 2 is disposed on the inner side of each section of the second casing, and the guide rails are disposed on the outer sides of each section of the second casing.
Referring to fig. 3, the second casing includes a casing 401, the casing 401 is located at the inner side, the casing 401 is made of geotextile, the casing is fixed on a metal mesh 402 by an adhesive, and an elastic hoop, in particular an elastic steel hoop, is welded on the other side of the metal mesh 402 opposite to the casing; the locking buckle 406 is welded at one end of the elastic steel hoop, the elastic steel hoop is deformed around the bend, meanwhile, referring to fig. 5, the locking pin 405 deforms and fixes the elastic steel hoop through the guide groove and the pin hole on the elastic steel hoop and the locking buckle pin hole, and the metal net and the cylinder surface deform along with the deformation, so as to prefabricate the cylinder.
The locking pin is a spring pin, one end of the locking pin is provided with an opening, and the other end of the locking pin is bent.
It can be understood that the elastic steel hoop is bent at two sides of the elastic steel hoop to form a guide groove 408 at a set position, specifically, the elastic steel hoop is bent at two sides of the set position to form the guide groove in an L shape, the guide groove is provided with a pin hole for a locking pin to pass through, the guide groove has a set length, and the installation of the locking buckle and the stability of the shape change of the second casing when the elastic steel hoop is unfolded are ensured through the arrangement of the guide groove;
the original state of the second protection barrel is rectangular, each section of the second protection barrel is bent, so that the locking buckle of each section of the second protection barrel moves to the guide groove, and then the locking pin is installed.
Further, one end of the locking pin is provided with an opening, a plurality of locking pins of each section of second casing are connected to the lifting rope together through the opening, the lifting rope is a rope, in this embodiment, the steel rope 3 is a steel rope, the lifting rope can be provided with scale marks, the second casing is convenient to determine in place, after the second casing of the corresponding section is in place, the lifting rope is pulled upwards, so that the locking pins are separated from the locking buckle, and the second casing is opened and attached to the hole wall.
Referring to fig. 4, the longitudinal section of the locking buckle is a transverse U-shape, the locking buckle is buckled at the elastic steel hoop, two inward sides of the locking buckle are respectively provided with a guide protruding block 407, one side of the locking buckle can be provided with at least one guide protruding block, the guide protruding block 407 can be embedded into a guide groove of the elastic steel hoop, and the locking buckle is provided with a pin hole for a locking pin to pass through; through the cooperation of the guide protruding block and the guide groove, the elastic steel hoop is folded into a circular ring (the circular ring is also kept when the elastic steel hoop is unfolded), the whole pile casing shape (cylinder) is kept unchanged when the flexible pile casing is released and unfolded, and deformation dislocation is avoided. In addition, the guide protruding block is stuck with rubber, or the guide protruding block is a rubber block fixed on the locking buckle, so that the speed of the pile casing steel hoop is kept within a certain range (the overspeed is avoided).
The pinhole that the locking knot set up is semicircle pinhole (semicylindrical pinhole), forms the rounding round pin hole with the semicircle pinhole of elasticity steel hoop when being connected fixedly with elasticity steel hoop, and the locking knot still is connected through other retaining members with elasticity steel hoop, and the locking knot pinhole department pastes has the rubber piece, when the locking pin is taken out, and the speed when guaranteeing that elasticity steel hoop struts is within reasonable scope.
In the embodiment, the cylinder surface is made of geotextile, the thickness of the geotextile material is 0.5-2mm, the aperture of the metal net is less than 5mm, and the mesh area is less than or equal to 20mm 2 。
In some examples, each section of the second casing is provided with a plurality of elastic hoops in a circumferential direction, and when the second casing is cylindrical, the elastic hoops are located in a circle in the circumferential direction of the second casing, and a set distance is set between two adjacent elastic hoops of each section of the second casing, for example, an upper elastic steel hoop 403 and a middle elastic steel hoop 404 in fig. 3.
Referring to fig. 6, for each section of the second casing, the guide rail 202 is connected to a chute body 204 provided in each section of the second casing, the chute body forms a chute 2 of each section of the second casing, the chute body is connected to the guide rail 202 by a bolt 203, referring to fig. 8, the guide rail 202 has a set length, the length of the guide rail is shorter than that of the chute body, and one end of the guide rail is provided with a spring block 201. The guide rail is placed in the outside of each section of second protects a section of thick bamboo, and the spout body is placed in the inboard of second protects a section of thick bamboo, and through bolt with guide rail and spout body coupling fixed on the second protects a section of thick bamboo, simultaneously the second protects a section of thick bamboo face and has the bolt hole, makes things convenient for the guide rail installation.
Referring to fig. 7, a clamping groove 206 is formed at one end of the chute body 204, a protruding block 205 matched with the clamping groove of another chute body is formed at the other end of the chute body, so that a guide rail enters the chute body, both sides of the opening end of the clamping groove are bent inwards so that the chute body of each section of second protection barrel can be clamped into the clamping groove 206 of the previous section of protection barrel (the first protection barrel or the previous section of second protection barrel), and the connection of the first protection barrel and the first section of second protection barrel or the connection of two adjacent sections of second protection barrels is facilitated.
In addition, the inner side of the first protection barrel is also provided with a chute body to form a chute of the first protection barrel, and the bottom end of the chute body of the first protection barrel is also provided with a clamping groove to clamp the chute body of the first section of second protection barrel.
Referring to fig. 9, openings are formed in opposite sides (near the connection side of the guide rail and the chute body) of the top end of each section of the second casing guide rail, a spring block 201 is arranged at the opening, the spring block 201 is positioned on opposite sides of the guide rail 202, when the chute is matched with the guide rail 202, the spring block is extruded, and when the guide rail moves to the clamping groove of the chute body, the spring block can pop out, but with the downward movement of the second casing, the arrangement of the spring block can ensure the further stable downward movement of the second casing;
the spring block comprises an elastic piece, the elastic piece is specifically a spring 20103, one end of the spring is connected with a rigid body, the other end of the spring is fixedly connected with guide rails of each section of second protection barrel, the spring can move along the guide rail openings under the action of external force, the rigid body is specifically a metal body 20102, the metal body can be in a block shape, a rubber pad 20101 is fixed on one side, away from the spring, of the metal body, a spring hole for installing the spring is formed in the metal body, the lower side edge of the extending end of the metal body is rounded, the rubber pad is adhered on the upper side of the metal body, the rubber pad slows down the descending speed of the protection barrel when the second protection barrel descends along a chute, and the descending operation quality of the second protection barrel is guaranteed.
The opening size of the second pile casing is determined by the pile casing and the pile hole diameter, and the whole pile casing can realize the protection construction operation of the cast-in-place pile hole walls with various diameter sizes.
During construction, the guide rail of the first section of second pile casing is downwards released along the chute of the first pile casing, the elastic block is preloaded into the chute, the whole first section of pile casing is downwards slowly placed, when placed at the bottom of the chute of the first pile casing, the locking pin is pulled out through the steel rope, the elastic steel hoop is slowly spread, the chute body and the chute of the first pile casing form a whole, then the elastic steel hoop is tightly attached to the wall of the hole, the whole first section of second pile casing and the steel pile casing form a whole, and the gap size between the first section of second pile casing and the embedded steel pile casing is smaller than 5mm, so that the second pile casing installation operation is completed.
During construction, the second section second casing is installed and the operation process of the first section second casing is repeated, so that the second section second casing and the first section second casing form a whole, and the first casing and the second casing form a whole.
Embodiment one:
the bored pile hole depth is 30m, the diameter of the pile hole is 1.5m (the circumference of the pile hole is about 4.7 m), and the geological condition is the soil texture structure of the northern plain area of Anhui. The depth of the steel pile casing is 3m, the ground is 1m higher, and the depth of the embedded steel pile casing is 2m; the second pile casing has a flat length of 5.2m and a height of 2.6m, 10 sections of second pile casings are adopted in the whole wall protection construction, sediment is arranged at the bottom of a pile hole, and the second pile casing is not supported at the bottom by 2 m.
During construction, the guide rail is firstly arranged on the second protective cylinder, and the locking buckle is welded at the corresponding position of the elastic steel hoop; carrying out a second casing while drilling operation along with the increase of the depth of a pile hole (drilling hole), bending the first section of the second casing around a drill rod on a pile face to form a cylinder, wherein the diameter of the cylinder is in the range of 1.2m-1.4m, and locking the cylinder through a locking pin; inserting the guide rail of the guide rail on the second casing into the sliding groove on the steel casing, pre-pressing the elastic block into the hole of the guide rail, and slowly releasing the second casing downwards; determining the falling depth of the second protective cylinder through the lifting rope, when the first section of second protective cylinder reaches the bottom of the steel protective cylinder, ejecting and clamping the second protective cylinder elastic block at the bottom of the steel protective cylinder sliding groove, and pulling out the locking pin through the lifting rope, so that the second protective cylinder is slowly stretched and then tightly attached to the hole wall to form a protective wall cylinder, and meanwhile, the first section of second protective cylinder guide rail sliding groove and the steel protective cylinder sliding groove are connected into a whole.
Next, the second section to the tenth section are sequentially released along the chute, and the setting construction process is the same as the first section. And after the installation construction of the tenth section second pile casing is finished, a flexible wall-protecting cylinder with the depth of 26m is formed in the bored pile hole, the gap between the sections is smaller than 5mm, and the construction of the whole bored pile hole wall pile casing is finished.
Embodiment two:
the depth of the bored pile hole is 40m, the diameter of the pile hole is 1.8m (the perimeter of the pile hole is about 5.7 m), and the geological condition is the soil texture structure of the northern plain area of Anhui. The depth of the steel pile casing is 3m, the ground is 1m higher, and the depth of the embedded steel pile casing is 2m; the second pile casing has a flattening length of 6.2m and a height of 3.0m, the whole wall-protecting construction adopts 12 sections of second pile casings, sediment is arranged at the bottom of a pile hole, and the second pile casing is not supported at the bottom by 2 m.
During construction, the guide rail is firstly arranged on the second protective cylinder, and the locking buckle is welded at the corresponding position of the elastic steel hoop; carrying out a second casing while drilling operation along with the increase of the drilling depth, bending the first section of the second casing around a drill rod on a pile face to form a cylinder, wherein the diameter of the cylinder is in the range of 1.3m-1.7m, and locking the cylinder through a locking pin; inserting the guide rail of the guide rail on the second casing into the sliding groove on the steel casing, pre-pressing the elastic block into the hole of the guide rail, and slowly releasing the second casing downwards; the first section of second pile casing reaches the bottom of the steel pile casing through the lifting rope, the second pile casing elastic block is ejected out to be clamped at the bottom of the steel pile casing sliding groove, the locking pin is pulled out through the lifting rope, the second pile casing is slowly opened and then tightly attached to the hole wall, the wall protection cylinder is formed, and meanwhile, the first section of second pile casing guide rail sliding groove and the steel pile casing sliding groove are connected into a whole.
Next, the second section to the tenth section are sequentially released along the chute, and the setting construction process is the same as the first section. And after the installation construction of the tenth section second pile casing is finished, a flexible wall-protecting cylinder with the depth of 36m is formed in the bored pile hole, the gap between the sections is smaller than 5mm, and the construction of the whole bored pile hole wall pile casing is finished.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The wall protection device for the bored pile is characterized by comprising a first protection cylinder, wherein a second protection cylinder is arranged in the first protection cylinder, the first protection cylinder is pre-buried and fixed on the ground at the top end of a pile hole, the lower half section of the first protection cylinder stretches into the pile hole, the second protection cylinder comprises a plurality of sections, the inner diameter of the second protection cylinder can be adjusted under the action of external force, and each section of second protection cylinder can be in clamping connection with the first protection cylinder or the upper section of second protection cylinder;
the second protective cylinder comprises a cylinder surface, the cylinder surface is fixed on a metal net, an elastic hoop is fixed on the metal net, a locking buckle is arranged at one end of the elastic hoop, and a locking pin is connected with the elastic hoop and the locking buckle so that the second protective cylinder forms a cylinder;
part or all of the second protective barrels are provided with guide rails and sliding grooves, the sliding grooves are formed through sliding groove bodies, the guide rails are connected with the sliding groove bodies through locking pieces, so that the guide rails are arranged on the outer sides of the second protective barrels, and the sliding groove bodies are arranged on the inner sides of the second protective barrels;
the inner side of the first protective cylinder is also provided with a chute body to form a chute, a guide rail arranged on each section of second protective cylinder is matched with the chute of the first protective cylinder or the last section of second protective cylinder, and when the second protective cylinder is lowered to a set position, two adjacent chute bodies are in clamping connection;
the elastic hoop is slowly spread, the chute body and the first pile casing chute form a whole, and then the elastic hoop is tightly attached to the wall of the hole, so that the whole first section of second pile casing and the steel pile casing form a whole.
2. A wall protection device for bored piles according to claim 1, wherein the cylindrical surface is made of geotextile.
3. The wall protecting device for bored piles according to claim 1, wherein the elastic collar is formed with guide grooves by bending at both sides thereof at a set position, both sides of the guide grooves are respectively provided with pin holes through which locking pins pass, and the locking buckles are also provided with pin holes through which the locking pins pass;
one end of the locking pin is provided with an opening to be connected with the lifting rope, and the other end of the locking pin can be bent.
4. A wall protection device for a bored pile according to claim 1, wherein each section of the second casing is provided with a plurality of elastic hoops in a circumferential direction, each section of the second casing is provided with a set distance between two adjacent elastic hoops, and all locking pins of each section of the second casing are connected to a lifting rope.
5. A wall guard for a bored pile according to claim 1, wherein the length of the chute body at each of the second casing is longer than the length of a guide rail connected to the chute body.
6. The wall protection device for bored piles according to claim 1, wherein one end of the chute body is provided with a clamping groove, the other end is provided with a protruding block matched with the clamping groove of the other chute body, and the protruding block is provided with a part of the chute;
the chute body is arranged at the bump in an open way, one end of the clamping groove is an open end, and two sides of the open end of the clamping groove are inwards bent.
7. A wall protection device for a bored pile according to claim 6, wherein at least one side of the guide rail is provided with an opening, a spring block is arranged at the opening, and the spring block is extruded during the downward movement of the guide rail along the chute;
the elastic block comprises an elastic piece connected with the guide rail, and the elastic piece is connected with the rigid body;
a rubber pad is fixed on one side of the rigid body far away from the elastic piece.
8. A method of operating a wall protection for a bored pile according to any one of claims 1 to 7, comprising the steps of:
the first pile casing is pre-buried on the ground at the top end of the pile hole, and the lower half section of the first pile casing penetrates into the pile hole;
releasing the first section of the second casing downwardly along the inner wall of the first casing;
when the first section of second casing is placed at the bottom of the first casing, the inner diameter of the second casing is increased, the first section of second casing is gradually attached to the hole wall, and the first section of second casing and the first casing form a whole under the action of external force;
and repeatedly completing the lowering of all the second casings.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111580129.0A CN114164842B (en) | 2021-12-22 | 2021-12-22 | Wall protection device for bored pile and working method |
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| CN202111580129.0A CN114164842B (en) | 2021-12-22 | 2021-12-22 | Wall protection device for bored pile and working method |
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| CN114164842B true CN114164842B (en) | 2023-08-15 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010112031A (en) * | 2008-11-05 | 2010-05-20 | ▲高▼嶋建設工事株式会社 | Cast-in-place pile construction method |
| CN208472717U (en) * | 2018-06-06 | 2019-02-05 | 中建二局第三建筑工程有限公司 | A kind of depth back filled region bored concrete pile steel pile casting retaining wall |
| CN110777787A (en) * | 2019-10-18 | 2020-02-11 | 中铁十局集团第一工程有限公司 | Method for preventing drilled pile from collapsing by automatically bouncing steel casing |
| CN112064629A (en) * | 2020-09-25 | 2020-12-11 | 深圳市盛业地下工程有限公司 | Advanced retaining wall device for cast-in-situ bored pile construction and construction method |
-
2021
- 2021-12-22 CN CN202111580129.0A patent/CN114164842B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010112031A (en) * | 2008-11-05 | 2010-05-20 | ▲高▼嶋建設工事株式会社 | Cast-in-place pile construction method |
| CN208472717U (en) * | 2018-06-06 | 2019-02-05 | 中建二局第三建筑工程有限公司 | A kind of depth back filled region bored concrete pile steel pile casting retaining wall |
| CN110777787A (en) * | 2019-10-18 | 2020-02-11 | 中铁十局集团第一工程有限公司 | Method for preventing drilled pile from collapsing by automatically bouncing steel casing |
| CN112064629A (en) * | 2020-09-25 | 2020-12-11 | 深圳市盛业地下工程有限公司 | Advanced retaining wall device for cast-in-situ bored pile construction and construction method |
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| CN114164842A (en) | 2022-03-11 |
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