CN110777787A - Method for preventing drilled pile from collapsing by automatically bouncing steel casing - Google Patents
Method for preventing drilled pile from collapsing by automatically bouncing steel casing Download PDFInfo
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- CN110777787A CN110777787A CN201910993140.6A CN201910993140A CN110777787A CN 110777787 A CN110777787 A CN 110777787A CN 201910993140 A CN201910993140 A CN 201910993140A CN 110777787 A CN110777787 A CN 110777787A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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Abstract
The invention discloses a method for preventing a drilled pile from collapsing by automatically popping up a steel casing. After a rolled steel casing capable of automatically bouncing off is placed to a position to be supported in a bored pile, the steel casing bounces off, and the outer wall of the steel casing is attached to and fixed with the hole wall of the bored pile to form support. The steel casing device capable of automatically popping open is constructed by adopting the steel casing device capable of automatically popping open and the steel casing hoisting device, the steel casing device capable of automatically popping open comprises a cylindrical steel casing rolled by a steel plate, two ends of the steel plate are lapped to form a hand, a reinforcing steel bar is welded on the inner side surface of the hand positioned on the outer side of the steel casing along the height direction of the steel casing to form a retraction clamping groove, a plurality of nuts are arranged at the positions of the hand of the steel casing, the hand of the steel casing is connected by a bolt inserted in the nuts, the top end of the bolt is connected with a connecting rope, and a plurality of reinforcing steel bar heads are fixedly connected on the outer side surface of the steel casing; the steel casing can be sleeved on the steel casing lifting device.
Description
Technical Field
The invention relates to a method for preventing a drilled pile from collapsing, and belongs to the technical field of engineering construction.
Background
In the construction process of the engineering bored pile, if unfavorable strata such as sand layers, pebble soils and other strata are encountered, hole collapse problems of different degrees are often caused. Some hole collapse problems can play a certain role in prevention through measures of increasing the specific gravity of slurry, improving the water head height, reducing the drilling speed, lengthening a protective barrel and the like, but the effect is not obvious when the hole collapse position is deep and the geology is particularly loose, and the hole collapse problems are easy to occur particularly when the specific gravity of the slurry is reduced in a hole cleaning process after hole forming, the placing time is long, and the hole wall is scratched when a steel reinforcement cage is placed downwards.
The construction of the bored pile in the unconsolidated formation is usually carried out to prevent hole collapse by measures of increasing the specific gravity of slurry, increasing the height of a water head, reducing the drilling speed and the like, but the hole must be cleaned when concrete is poured subsequently, the specific gravity of the slurry is reduced to a standard required value, so that the pressure of the water head in the hole is reduced, and the hole collapse is easily generated in the unconsolidated formation. In addition, the processes of cleaning holes, placing reinforcement cages and guide pipes, waiting for concrete and the like are also carried out between the hole forming and the concrete pouring, so that the long time is generally occupied, and the hole collapse condition is easy to occur in the period.
At present, hole collapse is always a difficult problem to face in the construction of a drilled pile, the hole collapse has a large influence on the quality of the drilled pile, the safety of personnel and equipment can be endangered due to the serious hole collapse, and the hole collapse treatment is time-consuming and labor-consuming.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for preventing a bored pile from collapsing by automatically bouncing off a steel casing, which can effectively solve the problem of collapsing during bored pile construction in a unconsolidated stratum and the problem of collapsing during hole cleaning or placement after the mud proportion is increased, the water head height is increased and the drilling speed is reduced, but the hole can be basically formed.
The invention is realized by the following technical scheme: a method for preventing a bored pile from collapsing by automatically popping up a steel casing is characterized by comprising the following steps: and (3) lowering the rolled steel casing capable of automatically bouncing off to a position to be supported in the bored pile, bouncing off the steel casing, and attaching and fixing the outer wall of the steel casing to the hole wall of the bored pile to form support.
According to the invention, after the rolled steel casing capable of automatically bouncing off is placed to a position to be supported in the bored pile, the steel casing bounces off and is clamped at a preset position, and the outer wall of the steel casing is attached and fixed with the hole wall of the bored pile, so that an enclosure space formed by rolling a steel plate is tightly attached to the hole wall, and the hole wall collapse of the bored pile can be prevented.
The invention also provides a steel casing device which is applied to the method and can be automatically flicked, and the following technical scheme is adopted: the utility model provides a can automatic spring open steel protects a device, characterized by: including the cylindric steel that adopts the steel sheet roll system to make and protect a section of thick bamboo, the both ends overlap joint of steel sheet forms the dip, the medial surface that is located the dip in the outside of a steel section of thick bamboo leads to long welding along the direction of height of a steel section of thick bamboo and has a reinforcing bar to form and return the draw-in groove the tip that is located the dip in the outside of a steel section of thick bamboo is provided with a plurality of nuts along the direction of height of a steel section of thick bamboo the tip that is located the dip of the outside of a steel section of thick bamboo is protected and is provided with a plurality of nuts the tip position that is located the dip of the inboard of a steel section of thick bamboo corresponds the outside also is equipped with a plurality of nuts, the dip of a steel section of thick bamboo is protected through the bolt connection of.
The main principle of the invention is to utilize the elasticity of the steel plate and the characteristic of automatic springing-open when the steel plate is rolled into a cylinder shape. In the invention, the steel plate is rolled into a cylindrical shape, the hand is arranged, and the rolled steel casing is self-locked through the bolt. The bolt can be pulled out through the connecting rope, so that the steel protective cylinder is bounced open. In order to prevent the steel protection cylinder from retracting after being bounced, the steel protection plate can be prevented from retracting through the arranged retracting clamping groove. A plurality of steel bar heads arranged on the outer side surface of the steel protection cylinder can be inserted into the hole wall of the drilling pile to increase the friction of the steel protection cylinder when the steel protection cylinder is bounced open, so that the steel protection cylinder is prevented from falling.
Furthermore, in order to ensure that the steel casing can be reliably fixed with the hole wall of the drilled pile after being bounced open, the length of the steel bar heads is 3cm, and the steel bar heads are distributed on the outer side surface of the steel casing in a quincunx shape.
Furthermore, in order to ensure the construction and the installation of the steel casing, the diameter of the rolled steel casing is 20cm smaller than that of the drilled pile.
The invention also provides a device for preventing the hole collapse of the drilled pile, which is applied to the method and adopts the technical scheme that: the utility model provides a device that hole collapse was collapsed to prevention bored pile, characterized by: the steel protective cylinder device capable of automatically popping open comprises a cylindrical steel protective cylinder made of steel plates in a rolling mode, two ends of each steel plate are connected in an overlapping mode to form a hand, a reinforcing steel bar is welded on the inner side face of the hand, located on the outer side, of the steel protective cylinder in a long-running mode along the height direction of the steel protective cylinder to form a retraction clamping groove, a plurality of nuts are arranged at the end portion of the hand, located on the outer side, of the steel protective cylinder along the height direction of the steel protective cylinder, a plurality of nuts are also arranged at the position, corresponding to the end portion of the hand, located on the outer side, of the outer side of the hand, located on the inner side of the steel protective cylinder, the hand of the steel protective cylinder is connected through bolts inserted into the nuts, the top ends of the bolts are connected with connecting ropes, and a plurality of reinforcing steel bar heads are fixedly connected to the surface of the outer side of the steel; the steel protects a section of thick bamboo and hangs put the device including first reinforcing bar ring, second reinforcing bar ring, third reinforcing bar ring, the fourth reinforcing bar ring that from top to bottom coaxial and interval set up in proper order, the diameter of first reinforcing bar ring and second reinforcing bar ring is the same, the diameter of third reinforcing bar ring and fourth reinforcing bar ring is the same and its diameter is greater than the diameter of first reinforcing bar ring and second reinforcing bar ring, and together through reinforcing bar welded connection between each reinforcing bar ring, evenly be provided with the wheeled cushion of four concretes on the fourth reinforcing bar ring, first reinforcing bar ring middle part is connected with the lifting hook, but steel protects a section of thick bamboo suit and put on the device is hung to steel protects a section of thick bamboo.
The steel casing device capable of automatically bouncing off during construction is matched with the steel casing hoisting device for construction. The steel protects a device cover that can pop open automatically during the construction and on steel protects a device and hangs put, can hang steel protecting a device and can pop open automatically and protect a device and hang into the preset position of bored pile through the crane with steel protecting a device, pulls out the bolt and makes the steel protect a back of popping out, and steel protects a device and hangs put the device and can expand the steel protecting a section of thick bamboo through its lower extreme in the lift-up process and prop, makes the steel protect a section of thick bamboo and open completely, makes the steel protect a section of thick bamboo and the pore wall laminating of bored pile fixed.
Furthermore, in order to ensure that the steel casing can be reliably fixed with the hole wall of the drilled pile after being bounced open, the length of the steel bar heads is 3cm, and the steel bar heads are distributed on the outer side surface of the steel casing in a quincunx shape.
Further, in order to facilitate the sleeving of the steel casing, the distance between the first steel bar ring and the second steel bar ring is 205cm, the distance between the second steel bar ring and the third steel bar ring is 20cm, and the distance between the third steel bar ring and the fourth steel bar ring is 10 cm.
Further, the distance between the central line of the steel bar for forming the retraction clamping groove and the end part of the end steel plate is 12 cm.
The invention also provides a method for constructing the bored pile by using the device for preventing the hole collapse of the bored pile, which is characterized by comprising the following steps of: the method comprises the following steps: (a) according to data of early construction investigation, the thickness of a poor stratum and the range of hole collapse are mastered, so that the height needing to be supported by a steel casing is determined, and the height is required to be manufactured in a throttling mode when the height exceeds 2 m; (b) manufacturing the steel casing device capable of automatically popping open according to the determined height of each section of steel casing, and processing the steel casing lifting device according to design; (c) sleeving the steel casing device capable of automatically popping open on the steel casing hoisting device, wherein a crane hook is connected with a hook on the steel casing hoisting device; (d) the crane lifts the steel casing lifting device and the steel casing device capable of automatically bouncing off into the drilled pile, the steel casing lifting device stops being placed after reaching a preset position, the bolt is pulled down through the connecting rope to automatically bounce off the steel casing, then the steel casing lifting device is lifted, and the steel casing is expanded and supported in the lifting process of the steel casing lifting device and is fixed on the hole wall of the drilled pile; (e) and hoisting and placing other sections until the installation of all the steel casing cylinders is completed.
Furthermore, in order to facilitate the lowering of the steel casing and ensure that the steel casing hanging device effectively expands the steel casing which is opened by bouncing, the diameter of the rolled steel casing is 20cm smaller than that of the drilled pile, and the diameter of the lower opening of the steel casing hanging device is 2cm smaller than that of the drilled pile.
The invention has the beneficial effects that: according to the invention, the steel casing capable of automatically popping open and the specially designed steel casing lifting device are adopted, so that the steel casing can be reliably lifted into a preset position in the drilled pile, the bolt of the rolled steel casing can be conveniently pulled out through the connecting rope to enable the steel casing to automatically pop open and be clamped in the drilled pile, and the steel casing lifting device is used for expanding and supporting the popped steel casing in the lifting process, so that the steel casing can be ensured to be completely opened, and the steel casing and the hole wall of the drilled pile can be reliably fixed. The anti-retraction clamping groove arranged on the steel casing can prevent the steel casing from retracting, can play a supporting role on the hole wall, and has more effective effect of preventing hole collapse than mud casing. The invention can effectively prevent the problem of hole collapse during the construction of the drilling pile in the unconsolidated formation, and can also solve the problem of hole collapse under the conditions of increasing the mud proportion, increasing the water head height, reducing the drilling speed and the like, but the hole can be basically formed after hole cleaning or placement for a long time. The steel casing adopted in the invention can be manufactured and installed in sections, so that the collapse hole can be managed at a fixed point, the installation position can be accurately controlled, namely, where the collapse hole is installed, compared with a full-length casing, the material is saved, and the problem that the casing is seriously wasted when the collapse hole is prevented by deepening the steel casing in the prior art can be solved.
Drawings
FIG. 1 is a schematic structural diagram of an automatically flickable steel casing device in the present invention;
FIG. 2 is an enlarged schematic view of the handsheet portion of the steel casing of FIG. 1;
FIG. 3 is a schematic view of the construction of the plug of the present invention;
FIG. 4 is a schematic view of the deployment of the automatically springable steel casing device of the present invention;
FIG. 5 is a front view of the steel casing hanging device of the present invention;
FIG. 6 is a top view of FIG. 5;
in the figure, 1, a steel casing, 2, an anti-retraction clamping groove, 3, a nut, 4, a steel bar head, 5, a bolt, 6, a connecting rope, 7, a first steel bar ring, 8, a second steel bar ring, 9, a third steel bar ring, 10, a fourth steel bar ring, 11, a concrete wheel type cushion block, 12, a steel bar, 13, a reinforcing steel bar, 14 and a lifting hook.
Detailed Description
The invention will now be further illustrated by way of non-limiting examples in conjunction with the accompanying drawings:
a method for preventing a bored pile from hole collapse by automatically popping out a steel casing is characterized in that the rolled steel casing capable of automatically popping out is placed to a position to be supported in the bored pile, the steel casing is popped out, and the outer wall of the steel casing is attached to and fixed with the hole wall of the bored pile to form a support.
As shown in the attached drawings, the device for preventing the collapse of the drilled pile, which is adopted for realizing the method, is as follows: comprises a steel casing device capable of automatically bouncing and a steel casing hoisting device. The steel casing device capable of automatically springing open comprises a cylindrical steel casing 1 which is made by rolling a steel plate, two ends of the steel plate forming the steel casing 1 are lapped to form a hand-making hand, a reinforcing steel bar with the diameter of 6mm is welded on the inner side surface of the outside hand grip of the steel protective cylinder 1 along the height direction of the steel protective cylinder 1 in a through-length mode to serve as a retraction clamping groove 2, a plurality of nuts 3 with the thickness of 8mm are welded at the end part of the outside hand of the steel casing 1 along the height direction of the steel casing 1, a plurality of nuts 3 with the diameter of 8mm are also arranged at the end part of the outer side surface of the inner hand of the steel casing 1 corresponding to the outer hand, the hand of grabbing of steel casing 1 is connected through the bolt 5 of cartridge in nut 3, 5 tops of bolt set up the ring and connect a connection rope 6, and the length of connecting rope 6 should be long enough and can lead to the bored pile drill way from waiting to strut the position. The bolt 5 is made of steel bars with the diameter of 6 mm. The outer side surface of the steel casing 1 is fixedly connected with a plurality of steel bar heads 4, the steel bar heads 4 are made of steel bars with the diameter of 6mm, the length of the steel bar heads 4 is preferably 3cm, the steel bar heads 4 are preferably distributed on the outer side surface of the steel casing 1 in a quincunx shape, and the distance is 50 cm. The steel casing lifting device comprises a first steel bar ring 7, a second steel bar ring 8, a third steel bar ring 9 and a fourth steel bar ring 10 which are coaxially arranged from top to bottom at intervals, the diameters of the first steel bar ring 7 and the second steel bar ring 8 are the same, the diameters of the third steel bar ring 9 and the fourth steel bar ring 10 are larger than the diameters of the first steel bar ring 7 and the second steel bar ring 8, the steel bar rings are welded together through steel bars 12, and in order to guarantee the structural strength of the steel casing lifting device, reinforcing steel bars 13 can be welded in the steel casing lifting device for reinforcement. Each reinforcing bar ring is made of round steel with the diameter of 20 mm. Four concrete wheel-type cushion blocks 11 are uniformly arranged on the fourth steel bar ring 10 along the circumference, the concrete wheel-type cushion blocks are wheel-shaped structures made of concrete, and the four concrete wheel-type cushion blocks 11 are arranged on the fourth steel bar ring 10 in a penetrating mode and can be fixed on two sides through welding steel bars for preventing movement. The middle part of the first reinforcing ring 7 is connected with a lifting hook 14, and the steel casing 1 can be sleeved on the steel casing lifting device.
In this embodiment, the distance between the first tendon ring 7 and the second tendon ring 8 is 205cm, the distance between the second tendon ring 8 and the third tendon ring 9 is 20cm, and the distance between the third tendon ring 9 and the fourth tendon ring 10 is 10 cm.
In this embodiment, the distance from the center line of the reinforcing bar for forming the retraction groove 2 to the end of the end steel plate is controlled to be 12 cm. The diameter of the rolled steel casing 1 is 20cm smaller than that of the drilled pile. The diameter of the lower opening of the steel casing hoisting device is 2cm smaller than that of the drilling pile.
The method for constructing the bored pile by adopting the device for preventing the hole collapse of the bored pile comprises the following steps:
(1) according to data of early construction investigation, the thickness of a poor stratum and the range of hole collapse are mastered, so that the height needing to be supported by a steel casing is determined, when the height exceeds 2m, the height is made in sections, and each section does not exceed 2 m;
(2) the steel that preparation can be automatically flicked protects a section of thick bamboo device: the height of the steel casing is determined according to the first step, and the perimeter of the steel casing is calculated and determined according to a formula. A round steel with the diameter of 6mm and the length of the round steel is welded in the vertical direction of the inner wall of the outer side of the steel protection cylinder in the vertical direction and serves as a retraction prevention clamping groove 2, when the steel protection cylinder is completely bounced open, the end portion of the steel protection cylinder just abuts against the retraction prevention clamping groove 2, and the length from the central line of the retraction prevention clamping groove 2 to the end portion of a steel plate is 12 cm. The steel plate can be rolled by virtue of a die, and the diameter of the rolled steel casing is controlled to be 20cm smaller than that of the drilled pile. And then welding nuts 3 at the seams of the outer walls of the steel casing and installing bolts 5 for locking, wherein the distance between the nuts is 50 cm. And welding the reinforcing steel bar heads 4 on the outer wall of the steel cylinder.
The calculation formula of the perimeter of the steel casing is as follows:
L＝2πR+20
wherein the perimeter (cm) of the L-steel casing and the radius (cm) of the R-drilled pile are 20cm which is a reserved hand-making part;
(3) manufacturing a steel casing hoisting device: and processing according to the structural size of the steel casing hoisting device, wherein the four circular rings are concentric. The concrete wheel type cushion block is ensured to be capable of rotating freely and is arranged according to the cross line direction.
The diameter of the two lower large rings (the third and fourth steel bar rings) is D1 ═ D-D3-2
The diameter of the two small circular rings (the first reinforcing ring and the second reinforcing ring) at the upper part is D2 ═ D-20-5
The diameter (cm) of the D-drilled pile, the diameter (cm) of the D1-large circular ring, the diameter (cm) of the D2-small circular ring and the diameter (cm) of the D3-concrete wheel type cushion block;
(4) the steel protecting cylinder device capable of automatically bouncing off is sleeved on the steel protecting cylinder hanging device, and a plurality of steel bar heads can be welded on the steel protecting cylinder top to serve as a pressing plate, so that the steel protecting cylinder is prevented from being lifted and moving when the bolt is pulled out. The crane hook is connected with a hook 14 on the steel casing hoisting device;
(5) the crane lifts the steel protection cylinder lifting device and the steel protection cylinder device capable of automatically bouncing out into a drilled pile, the position of the steel protection cylinder 1 in the hole is judged according to the depth of a steel wire rope of the crane or a hole of a connecting rope 6 connected with a bolt 5, the steel protection cylinder 1 stops being placed after reaching a preset position, the bolt 5 is pulled out through the connecting rope 6, the steel protection cylinder 1 automatically bounces out, and then the steel protection cylinder lifting device is slowly lifted.
(6) And hoisting and placing other sections until the installation of all the steel casing cylinders is completed.
The invention can prevent the hole collapse problem in the construction of the drilling pile in the unconsolidated stratum, and also can solve the problem that the hole collapse occurs in the situations of hole cleaning or long standing time and the like, although the hole can be basically formed after the mud proportion is increased, the water head height is increased and the drilling speed is reduced. The automatic bouncing-off steel casing adopted by the invention can be manufactured and installed in sections, can realize fixed-point hole treatment, can accurately control the installation position, saves more materials compared with a full-length casing, and can solve the problem of serious casing waste when the hole collapse is prevented by deepening the steel casing in the prior art.
Other parts in this embodiment are the prior art, and are not described herein again.
Claims (10)
1. A method for preventing a bored pile from collapsing by automatically popping up a steel casing is characterized by comprising the following steps: and (3) lowering the rolled steel casing capable of automatically bouncing off to a position to be supported in the bored pile, bouncing off the steel casing, and attaching and fixing the outer wall of the steel casing to the hole wall of the bored pile to form support.
2. The utility model provides a can automatic spring open steel protects a device, characterized by: the steel protection device comprises a cylindrical steel protection cylinder made by rolling a steel plate, wherein two ends of the steel plate are lapped to form a hand, the inner side surface of the hand, which is positioned on the outer side of the steel protection cylinder, is welded with a reinforcing steel bar in a long way along the height direction of the steel protection cylinder to form a retraction clamping groove (2), the end part of the hand, which is positioned on the outer side of the steel protection cylinder, is provided with a plurality of nuts along the height direction of the steel protection cylinder, the end part position of the hand, which is positioned on the outer side, of the outer side of the hand, corresponding to the end part position of the hand, is also provided with a plurality of nuts, the hand of the steel protection cylinder is connected through a bolt (5) inserted in the nuts, the top end of the bolt (5) is connected with a connecting rope, and the outer surface.
3. The automatically flickable steel casing device according to claim 2, wherein: the length of the reinforcing steel bar heads (4) is 3cm, and the reinforcing steel bar heads (4) are distributed on the outer side surface of the steel casing in a quincunx shape.
4. The automatically flickable steel casing device according to claim 2, wherein: the diameter of the rolled steel casing is 20cm smaller than that of the drilled pile.
5. The utility model provides a device that hole collapse was collapsed to prevention bored pile, characterized by: the steel protective cylinder device capable of automatically popping open comprises a cylindrical steel protective cylinder made of steel plates in a rolling mode, two ends of each steel plate are lapped to form a hand, a reinforcing steel bar is welded on the inner side face of the hand positioned on the outer side of the steel protective cylinder in a full-length mode along the height direction of the steel protective cylinder to form a retraction clamping groove (2), a plurality of nuts are arranged at the end part of the hand positioned on the outer side of the steel protective cylinder along the height direction of the steel protective cylinder, a plurality of nuts are also arranged at the end part of the hand positioned on the outer side of the hand positioned on the inner side of the steel protective cylinder and corresponding to the hand positioned on the outer side of the steel protective cylinder, the hands of the steel protective cylinder are connected through bolts (5) inserted into the nuts, the top ends of the bolts (5) are connected with connecting ropes, and a plurality of reinforcing steel bar heads (4) are fixedly connected to the surface of the outer side of the steel protective cylinder; the steel protects a section of thick bamboo and hangs put including first reinforcing bar ring (7), second reinforcing bar ring (8), third reinforcing bar ring (9), fourth reinforcing bar ring (10) that from top to bottom coaxial and interval set up in proper order, the diameter of first reinforcing bar ring (7) and second reinforcing bar ring (8) is the same, the diameter of third reinforcing bar ring (9) and fourth reinforcing bar ring (10) is the same and its diameter is greater than the diameter of first reinforcing bar ring (7) and second reinforcing bar ring (8), link together through reinforcing bar welded connection between each reinforcing bar ring, evenly be provided with four wheeled cushion of concrete (11) on fourth reinforcing bar ring (10), first reinforcing bar ring (7) middle part is connected with the lifting hook, the steel protects a section of thick bamboo can the suit and put on the device is protected to the steel.
6. The apparatus for preventing collapse of a bored pile according to claim 5, wherein: the length of the reinforcing steel bar heads (4) is 3cm, and the reinforcing steel bar heads (4) are distributed on the outer side surface of the steel casing in a quincunx shape.
7. The apparatus for preventing collapse of a bored pile according to claim 5, wherein: the distance between the first tendon ring (7) and the second tendon ring (8) is 205cm, the distance between the second tendon ring (8) and the third tendon ring (9) is 20cm, and the distance between the third tendon ring (9) and the fourth tendon ring (10) is 10 cm.
8. The apparatus for preventing collapse of a bored pile according to claim 5, wherein: the distance between the central line of the steel bar for forming the retraction clamping groove (2) and the end part of the end steel plate is 12 cm.
9. A method for constructing a bored pile using the apparatus for preventing collapse of a bored pile according to any one of claims 5 to 8, wherein: the method comprises the following steps: (a) according to data of early construction investigation, the thickness of a poor stratum and the range of hole collapse are mastered, so that the height needing to be supported by a steel casing is determined, and the height is required to be manufactured in a throttling mode when the height exceeds 2 m; (b) manufacturing the steel casing device capable of automatically popping open according to the determined height of each section of steel casing, and processing the steel casing lifting device according to design; (c) sleeving the steel casing device capable of automatically popping open on the steel casing hoisting device, wherein a crane hook is connected with a hook on the steel casing hoisting device; (d) the crane lifts the steel casing lifting device and the steel casing device capable of automatically bouncing off into the drilled pile, the steel casing lifting device stops being placed after reaching a preset position, the bolt is pulled down through the connecting rope to automatically bounce off the steel casing, then the steel casing lifting device is lifted, and the steel casing is expanded and supported in the lifting process of the steel casing lifting device and is fixed on the hole wall of the drilled pile; (e) and hoisting and placing other sections until the installation of all the steel casing cylinders is completed.
10. The apparatus for preventing collapse of a bored pile according to claim 9, wherein: the diameter of the rolled steel casing is 20cm smaller than that of the drilling pile, and the diameter of the lower opening of the steel casing hoisting device is 2cm smaller than that of the drilling pile.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910993140.6A CN110777787A (en) | 2019-10-18 | 2019-10-18 | Method for preventing drilled pile from collapsing by automatically bouncing steel casing |
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| CN201910993140.6A CN110777787A (en) | 2019-10-18 | 2019-10-18 | Method for preventing drilled pile from collapsing by automatically bouncing steel casing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114164842A (en) * | 2021-12-22 | 2022-03-11 | 山东省路桥集团有限公司 | Wall protection device for cast-in-situ bored pile and working method |
| CN115316186A (en) * | 2022-09-09 | 2022-11-11 | 徐玮彬 | Circular pipe pile matched with tree planting and slope fixing for soil slope |
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| CN101644050A (en) * | 2009-09-01 | 2010-02-10 | 中交第二航务工程局有限公司 | Combined steel casing and construction method of waterborne drilled pile based on same |
| CN105178291A (en) * | 2015-08-21 | 2015-12-23 | 中国路桥工程有限责任公司 | Large pile foundation construction method |
| CN105625420A (en) * | 2016-03-10 | 2016-06-01 | 西北综合勘察设计研究院 | Extension type manual hole digging pile support structure and construction method thereof |
| CN211057786U (en) * | 2019-10-18 | 2020-07-21 | 中铁十局集团第一工程有限公司 | Steel casing device capable of automatically bouncing off and device for preventing hole collapse of drilled pile |
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