A two-knife breaking process for retaining piles

Abstract

The present invention discloses a two-knife breaking process for retaining piles, which relates to the field of building construction technology, including using a pneumatic pick to break the concrete protective layer on the top of the intended breaking area of ​​the retaining pile, then using a gas cutter to cut off the steel bars of the two-thirds radius pile outside the top, then using a pneumatic pick to break the concrete of the two-thirds radius pile at the top pile core, and finally using a gas cutter to cut off the steel bars of the two-thirds radius pile inside the three-thirds radius pile; multiple steel pipes with a diameter slightly smaller than the gap are placed in the cut two-thirds radius pile gap, and one end of the multiple steel pipes is treated with anti-rolling through a fixing device, and the multiple steel pipes are arranged side by side, and both ends extend out of the periphery of the retaining pile. The present invention first cuts the top of the intended breaking area to prevent the pile body at the upper end of the retaining pile from becoming a tension zone under the gravity of the intended breaking area, and then cuts the bottom of the intended breaking area to avoid bending and deformation of the steel bars during the chiseling process, as well as the pulling of the steel bars on the pile body and pile foundation, thereby ensuring construction safety.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a two-knife breaking process for retaining piles. Background Art

[0002] During the tunnel construction process, depending on the geological conditions and actual conditions of the construction location, open-cut construction is sometimes used as a construction method. Open-cut construction is often accompanied by the excavation of deep foundation pits. Retaining piles are often used for support during foundation pit excavation. After the foundation pit construction is completed under the support of the retaining piles, the retaining pile structure may invade the construction limit of the completed or planned tunnel. This requires the removal of the built retaining pile structure. When removing the retaining piles, the correct construction method should be selected to ensure the construction quality and safety. The traditional method of removing retaining piles is to first manually chisel out the main reinforcement and inclinometer tube of the steel cage with a pneumatic pick, then use manual assistance and small machinery to chisel them out, and then clean up the debris. The disadvantages of this method are: (1) traditional concrete chiseling is time-consuming and labor-intensive; (2) the steel bars are easily bent during the chiseling process, and the steel bars have a pulling force on the pile body and pile foundation, which seriously affects construction safety; (3) the pile head is uneven after the chiseling, and the pile body and pile foundation are severely damaged; (4) the chiseling process takes a long time, the noise is loud, and the dust is serious. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a two-knife breaking process for retaining piles, so that the breaking of retaining piles is simpler, more convenient, time-saving and labor-saving, and the construction quality and construction safety are guaranteed.

[0004] The present invention solves the above technical problems by the following technical means:

[0005] A two-knife breaking process for retaining piles comprises the following steps:

[0006] S1. Use a pneumatic pick to break the concrete protective layer on the top of the area to be broken by the retaining piles, then use a gas cutter to cut off the steel bars of the top outer two-thirds radius pile from one side, then use a pneumatic pick to break the concrete of the top two-thirds radius pile core, and finally use a gas cutter to cut off the steel bars of the inner two-thirds radius pile;

[0007] S2, put multiple steel pipes with diameters slightly smaller than the gap into the cut two-thirds radius pile gap, and use a fixing device to perform anti-rolling treatment on one end of the multiple steel pipes. The multiple steel pipes are arranged side by side, and both ends extend out of the outer periphery of the retaining pile 2;

[0008] S3, using a pneumatic pick to break the concrete protective layer at the bottom of the area to be broken of the retaining piles, and then using a gas cutter to cut off the steel bars of the two-thirds radius piles on the outer side of the bottom from the other side, and then using a pneumatic pick to break the concrete of the two-thirds radius piles at the bottom pile core, and finally using a gas cutter to cut off the steel bars of the two-thirds radius piles on the inner side, and using the method in S2 to place a steel pipe in the gap of the cut two-thirds radius piles;

[0009] S4, using gas cutting to cut off the steel bars of the remaining one-third radius pile on the top outer periphery, then using a pneumatic pick to break off the concrete of the remaining one-third radius pile on the top pile core, and then using gas cutting to cut off the steel bars of the remaining one-third radius pile on the inner periphery, and using the method in S2 to continue to put steel pipes into the cutout of the remaining one-third radius pile;

[0010] S5, using gas cutting to cut off the steel bars of the remaining one-third radius pile on the outer periphery of the bottom, then using a pneumatic pick to break off the concrete of the remaining one-third radius pile at the bottom pile core, and then using gas cutting to cut off the steel bars of the remaining one-third radius pile on the inner periphery, and using the method in S2 to continue to put steel pipes into the cutout of the remaining one-third radius pile;

[0011] S6. First release the fixing device of the steel pipe in the top gap of the area to be broken by the retaining pile, remove the steel pipes of one-third radius piles from both sides, and set the removed steel pipes side by side outside the gap on the same side of the bottom, then release the fixing device of the steel pipe in the bottom gap of the area to be broken by the retaining pile, and then push the area to be broken from the other side to make it slide on the steel pipes set side by side at the bottom until it is completely out of the upper and lower gaps.

[0012] By first breaking down two-thirds of the radius piles of the retaining piles, filling the breaking mouth with steel pipes and then breaking down the remaining one-third of the radius piles, the temporary bearing capacity of the steel pipes during the breaking process can be fully utilized to ensure construction safety; secondly, the steel pipes filled at the bottom of the area to be broken can play a supporting role and also a pulley group. After the top and bottom of the area to be broken are cut, it is only necessary to push the area to be broken to slide on the steel pipe to remove it. There is no need to use a jackhammer to remove the concrete in the area, making the breaking of the retaining piles simpler, more convenient, time-saving and labor-saving.

[0013] Furthermore, the fixing device is composed of a positioning clamp and a plurality of limiting semicircular rings, the positioning clamp comprises an upper clamp body and a lower clamp body, the upper clamp body and the lower clamp body are semicircular ring clamp bodies which are butt-jointed to form a circular ring, the lower clamp body is divided into two parts by the middle part to form two lower left clamp bodies and lower right clamp bodies of the same size, one end of one limiting semicircular ring and one end of the lower left clamp body are hinged to one end of the upper clamp body by the same pin, one end of another limiting semicircular ring and one end of the lower right clamp body are hinged to the other end of the upper clamp body by the same pin, the openings of the limiting semicircular rings are all toward one side of the lower clamp body, the remaining limiting semicircular rings are respectively hinged end to end with the two limiting semicircular rings hinged to the positioning clamp by pins to form a linear structure, and a locking structure is provided at the junction of the lower left clamp body and the lower right clamp body. The fixing device of this design has a simple structure and is easy to use. When in use, first fix the positioning clamp on a steel pipe, and then put the secondary steel pipe into the incision, and then put in one and fix it one by one. The operation is simple and convenient, the stability is good, and it can effectively prevent the steel pipe from slipping out of the incision due to rolling.

[0014] Furthermore, the locking structure includes a threaded rod and a locking nut mounted on the threaded rod, a hinge seat is provided on the lower left clamp body, one end of the threaded rod is rotatably connected to the hinge seat, a U-shaped clamping groove is provided on the lower right clamp body, the threaded rod can be clamped into the U-shaped clamping groove, and the lower left clamp body and the lower right clamp body are fixedly connected into one body through the locking nut. This locking structure is simple and convenient to operate, has good stability, can improve work efficiency, and ensure construction safety.

[0015] Furthermore, the positioning clamp is provided with a plurality of anti-sliding blocks along the inner circumference thereof, and the anti-sliding blocks are made of rubber blocks. The rubber anti-sliding blocks can effectively prevent the positioning clamp from transmitting on the steel pipe, making it more stable, thereby better limiting the steel pipes on both sides thereof through the limiting semicircular ring, so that multiple steel pipes arranged side by side can be stably placed in the incision.

[0016] Furthermore, the pins at the hinge of any two adjacent limiting semicircular rings can be disassembled. The detachable hinge pin design can increase or decrease the number of limiting semicircular rings at any time according to the diameter of the retaining pile, making the use of the fixing device more flexible, simple and quick.

[0017] Furthermore, any two adjacent limiting semicircular rings are hinged at a limiting block, and under the action of the limiting block, one of the two adjacent limiting semicircular rings can only rotate upward relative to the other limiting semicircular ring. The limiting block can prevent the limiting semicircular ring from rotating downward, affecting the positioning operation of the steel pipe inserted later.

[0018] Furthermore, the limiting semicircular ring is provided with a sawtooth structure along its inner circumference. The sawtooth structure can increase the friction between the limiting semicircular ring and the steel pipe, thereby improving its positioning and anti-rolling functions.

[0019] Beneficial effects of the present invention:

[0020] 1. The present invention first cuts the top of the area to be broken to prevent the pile body at the upper end of the retaining pile from becoming a tension zone under the gravity of the area to be broken, and then cuts the bottom of the area to be broken to avoid bending and deformation of the steel bars during the chiseling process, as well as the pulling of the steel bars on the pile body and pile foundation, thereby ensuring construction safety; in addition, the upper and lower pile heads after breaking are flat and aesthetically pleasing, with minimal damage to the pile body and pile foundation, which can ensure that the original performance of the pile body and pile foundation is not affected.

[0021] 2. The present invention first breaks two-thirds of the radius piles of the retaining piles, fills the steel pipes at the breaking opening, and then breaks the remaining one-third of the radius piles, so that the temporary bearing capacity of the steel pipes in the breaking process can be fully utilized to ensure construction safety; secondly, the steel pipes filled at the bottom of the area to be broken can play a supporting role and a pulley group at the same time. After the top and bottom of the area to be broken are cut, it is only necessary to push the area to be broken to slide on the steel pipe to remove it, and there is no need to use a jackhammer to remove the concrete in the area, so that the breaking of the retaining piles is simpler, more convenient, time-saving and labor-saving, and the breaking time is short, the noise is small, and the dust is small.

[0022] 3. The fixing device of the present invention has a simple structure and is easy to use. When in use, the positioning clamp is first fixed on a steel pipe, and then the secondary steel pipe is placed into the incision, and then one by one can be placed and fixed. The operation is simple and convenient, the stability is good, and it can effectively prevent the steel pipe from sliding out of the incision due to rolling. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of using a pneumatic pick to break the top concrete protective layer of the present invention;

[0024] Figure 2 It is a schematic diagram of the present invention using gas cutting to cut two-thirds of the radius of the pile steel bar except the top;

[0025] Figure 3 It is a schematic diagram of using a pneumatic pick to break the concrete of a pile with a radius of two-thirds of the top pile core;

[0026] Figure 4 It is a schematic diagram of the present invention using gas cutting to cut off the remaining one third of the radius of the pile reinforcement bar at the top outer circumference;

[0027] Figure 5 It is a schematic diagram of using a pneumatic pick to break the concrete of the remaining one-third of the radius of the pile at the top pile center of the present invention;

[0028] Figure 6 It is a schematic diagram of using a pneumatic pick to break the bottom concrete protective layer of the present invention;

[0029] Figure 7It is a schematic diagram of the present invention using gas cutting to cut the two-thirds radius of the pile reinforcement bar excluding the bottom;

[0030] Figure 8 It is a schematic diagram of using a pneumatic pick to break the concrete of a pile with a radius of two-thirds of the bottom pile core of the present invention;

[0031] Fig. 9 It is a schematic diagram of the present invention using gas cutting to cut off the remaining one third of the radius of the pile reinforcement bar at the bottom periphery;

[0032] Fig.10 It is a schematic diagram of using a pneumatic pick to break the concrete of the remaining one-third of the radius of the pile at the bottom of the pile center according to the present invention;

[0033] Fig.11 is a schematic diagram of removing the area to be broken of the present invention;

[0034] Fig.12 The structure of the fixing device of the present invention is shown in FIG. Figure 1 ;

[0035] Fig.13 The structure of the fixing device of the present invention is shown in FIG. Figure 2 ;

[0036] Fig.14 yes Fig.13 A partial enlarged view of the middle part;

[0037] Among them, there are pneumatic pick 1, demolished retaining piles 2, area to be demolished 3, gas cutting 4, steel pipe 5, positioning clamp 6, upper clamp body 61, lower clamp body 62, lower left clamp body 621, lower right clamp body 622, limiting semicircular ring 7, pin 8, locking structure 9, threaded rod 91, locking nut 92, hinged seat 10, U-shaped clamping groove 11, anti-sliding block 12, limiting block 13, and serrated structure 14. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings:

[0039] Embodiment 1

[0040] like Figure 1-Figure 11 As shown, a two-knife breaking process for retaining piles includes the following steps:

[0041] S1, using a pneumatic pick 1 to break the concrete protective layer at the top of the intended breaking area 3 of the retaining pile 2, and then using a gas cutter 4 to cut off the steel bars of the top outer two-thirds radius pile from one side, and then using a pneumatic pick to break the concrete of the top pile core two-thirds radius pile, and finally using a gas cutter to cut off the steel bars of the inner two-thirds radius pile;

[0042] S2, put multiple steel pipes 5 with a diameter slightly smaller than the gap into the cut two-thirds radius pile gap, and use a fixing device to perform anti-rolling treatment on one end of the multiple steel pipes 5, and the multiple steel pipes 5 are arranged side by side, and both ends extend out of the outer periphery of the retaining pile 2;

[0043] S3, using a pneumatic pick 1 to break the concrete protective layer at the bottom of the area 3 to be broken by the retaining pile 2, and then using a gas cutter 4 to cut off the steel bars of the two-thirds radius pile outside the bottom from the other side, and then using a pneumatic pick to break the concrete of the two-thirds radius pile at the bottom pile core, and finally using a gas cutter to cut off the steel bars of the two-thirds radius pile inside the pile core, and using the method in S2 to put a steel pipe 5 into the cut two-thirds radius pile gap;

[0044] S4, using gas cutting 3 to cut off the steel bars of the remaining one-third radius pile on the outer periphery of the top, then using pneumatic pick 1 to break the concrete of the remaining one-third radius pile at the top pile core, and then using gas cutting 4 to cut off the steel bars of the remaining one-third radius pile on the inner periphery, and using the method in S2 to continue to put the steel pipe 5 into the cutout of the remaining one-third radius pile;

[0045] S5, using gas cutting 3 to cut off the steel bars of the remaining one-third radius pile on the outer periphery of the bottom, then using pneumatic pick 1 to break the concrete of the remaining one-third radius pile at the bottom pile core, and then using gas cutting 4 to cut off the steel bars of the remaining one-third radius pile on the inner periphery, and using the method in S2 to continue to put steel pipe 5 into the cutout of the remaining one-third radius pile;

[0046] S6. First release the fixing device of the steel pipe 5 in the top notch of the area 3 to be broken of the retaining pile 2, remove the steel pipe 5 of one-third radius of the pile from both sides, and set the removed steel pipe 5 side by side outside the notch on the same side of the bottom, then release the fixing device of the steel pipe 5 in the bottom notch of the area 3 to be broken of the retaining pile 2, and then push the area 3 to be broken from the other side to make it slide on the steel pipes 5 set side by side at the bottom until it is completely out of the upper and lower notches.

[0047] In this embodiment, by first breaking two-thirds of the radius piles of the retaining piles 2, filling the broken gap with the steel pipe 5, and then breaking the remaining one-third of the radius piles, the temporary bearing capacity of the steel pipe 5 in the breaking process can be fully utilized to ensure construction safety; secondly, the steel pipe 5 filled at the bottom of the area to be broken 3 can play a supporting role and also play the role of a pulley block. After the top and bottom of the area to be broken 3 are cut, it is only necessary to push the area to be broken 3 to slide on the steel pipe 5 to remove it, and there is no need to use the jackhammer 1 to chisel the concrete in the area, so that the breaking of the retaining pile 2 is simpler, more convenient, time-saving and labor-saving, and the breaking time is short, and the noise and dust are small.

[0048] Embodiment 2

[0049] The difference between this embodiment and the first embodiment is that: 1) in this embodiment, the steel pipe 5 is not filled in the broken gap; 2) in this embodiment, the jackhammer 1 is finally used to chisel away the concrete in the area 3 to be broken.

[0050] Embodiment 3

[0051] Based on the first embodiment, this embodiment further provides a fixing device to prevent the steel pipe from rolling.

[0052] like Figure 12-14 As shown, the fixing device is composed of a positioning clamp 6 and a plurality of limiting semicircular rings 7. The positioning clamp 6 includes an upper clamp body 61 and a lower clamp body 62. The upper clamp body 61 and the lower clamp body 62 are semicircular clamp bodies that are connected to each other to form a ring. The lower clamp body 62 is divided into two parts by the middle to form two lower left clamp bodies 621 and lower right clamp bodies 622 of the same size. One end of one limiting semicircular ring 7 and one end of the lower left clamp body 621 are connected to the upper clamp body 61 through the same pin 8. One end of the clamp body 61 is hinged, and one end of another limiting semicircular ring 7 and one end of the lower right clamp body 622 are hinged to the other end of the upper clamp body 61 through the same pin 8. The openings of the limiting semicircular rings 7 are all facing one side of the lower clamp body 62, and the remaining limiting semicircular rings 7 are hinged end to end with the two limiting semicircular rings 7 hinged to the positioning clamp 6 through the pins 8 to form a linear structure. A locking structure 9 is provided at the junction of the lower left clamp body 621 and the lower right clamp body 622.

[0053] The locking structure 9 includes a threaded rod 91 and a locking nut 92 installed on the threaded rod 91. A hinge seat 10 is provided on the lower left clamp body 621. One end of the threaded rod 91 is rotatably connected to the hinge seat 10. A U-shaped clamping groove 11 is provided on the lower right clamp body 622. The threaded rod 91 can be inserted into the U-shaped clamping groove 11, and the lower left clamp body 621 and the lower right clamp body 622 are fixedly connected into one body through the locking nut 92.

[0054] The positioning clamp 6 is provided with a plurality of anti-sliding blocks 12 along the inner circumference thereof, and the anti-sliding blocks 12 are made of rubber blocks.

[0055] The pins 8 at the hinged joints of any two adjacent limiting semicircular rings 7 can be disassembled.

[0056] A limiting block 13 is provided at the hinged position of any two adjacent limiting semicircular rings 7 , and under the action of the limiting block 13 , one of the limiting semicircular rings 7 can only rotate upward relative to the other limiting semicircular ring 7 .

[0057] The limiting semicircular ring 7 is provided with a sawtooth structure 14 along its inner circumference.

[0058] The fixing device of this embodiment has a simple structure and is easy to use. When in use, the positioning clamp 6 is first fixed on a steel pipe 5, and then the secondary steel pipe 5 is placed in the incision, and then one can be placed and fixed. The operation is simple and convenient, the stability is good, and the steel pipe 5 can be effectively prevented from sliding out of the incision due to rolling.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention. The techniques, shapes, and structural parts not described in detail in the present invention are all known technologies.

Claims

1. A two-knife breaking process for retaining piles, characterized in that: The following steps are involved: S1. Use a pneumatic pick to break the concrete protective layer on the top of the area to be broken by the retaining piles, then use a gas cutter to cut off the steel bars of the top outer two-thirds radius pile from one side, then use a pneumatic pick to break the concrete of the top two-thirds radius pile core, and finally use a gas cutter to cut off the steel bars of the inner two-thirds radius pile; S2. Place multiple steel pipes with diameters slightly smaller than the cut-off two-thirds radius pile gap, and use a fixing device to perform anti-rolling treatment on one end of the multiple steel pipes. The multiple steel pipes are arranged side by side, and both ends extend out of the outer periphery of the retaining pile; S3, using a pneumatic pick to break the concrete protective layer at the bottom of the area to be broken of the retaining piles, and then using a gas cutter to cut off the steel bars of the two-thirds radius piles on the outside of the bottom from the other side, and then using a pneumatic pick to break the concrete of the two-thirds radius piles at the bottom of the pile core, and finally using a gas cutter to cut off the steel bars of the two-thirds radius piles on the inside, and using the method described in S2 to place a steel pipe in the gap of the cut two-thirds radius piles; S4, using gas cutting to cut off the steel bars of the remaining one-third radius pile on the top outer periphery, then using a pneumatic pick to break off the concrete of the remaining one-third radius pile on the top pile core, and then using gas cutting to cut off the steel bars of the remaining one-third radius pile on the inner periphery, and using the method described in S2 to continue to put steel pipes into the cutout of the remaining one-third radius pile; S5, using gas cutting to cut off the steel bars of the remaining one-third radius pile on the outer periphery of the bottom, then using a pneumatic pick to break off the concrete of the remaining one-third radius pile at the bottom pile core, and then using gas cutting to cut off the steel bars of the remaining one-third radius pile on the inner periphery, and using the method described in S2 to continue to put steel pipes into the cutout of the remaining one-third radius pile; S6. First, release the fixing device of the steel pipe in the top gap of the area to be broken by the retaining pile, remove the steel pipes of one-third radius piles from both sides, and place the removed steel pipes side by side outside the gap on the same side of the bottom, then release the fixing device of the steel pipe in the bottom gap of the area to be broken by the retaining pile, and then push the area to be broken from the other side to make it slide on the steel pipes placed side by side at the bottom until it is completely out of the upper and lower gaps; The fixing device is composed of a positioning clamp and a plurality of limiting semicircular rings, and the positioning clamp comprises an upper clamp body and a lower clamp body, and the upper clamp body and the lower clamp body are semicircular ring clamp bodies that are connected to each other to form a ring, and the lower clamp body is divided into two parts by the middle to form two lower left clamp bodies and lower right clamp bodies of the same size, one end of one of the limiting semicircular rings and one end of the lower left clamp body are hinged to one end of the upper clamp body through the same pin, and one end of another limiting semicircular ring and one end of the lower right clamp body are hinged to the other end of the upper clamp body through the same pin, and the openings of the limiting semicircular rings are all facing one side of the lower clamp body, and the remaining limiting semicircular rings are respectively hinged head to tail with the two limiting semicircular rings hinged to the positioning clamp through pins to form a linear structure, and a locking structure is provided at the junction of the lower left clamp body and the lower right clamp body.

2. A two-knife breaking process for retaining piles according to claim 1, characterized in that: The locking structure includes a threaded rod and a locking nut installed on the threaded rod. The lower left clamp body is provided with a hinge seat. One end of the threaded rod is rotatably connected to the hinge seat. The lower right clamp body is provided with a U-shaped clamping groove. The threaded rod can be inserted into the U-shaped clamping groove, and the lower left clamp body and the lower right clamp body are fixedly connected into one body through the locking nut.

3. A two-knife breaking process for retaining piles according to claim 2, characterized in that: The positioning clamp is provided with a plurality of anti-sliding blocks along the inner circumference thereof, and the anti-sliding blocks are made of rubber blocks.

4. A two-knife breaking process for retaining piles according to claim 3, characterized in that: The pins at the hinged joint of any two adjacent limiting semicircular rings can be disassembled.

5. A two-knife breaking process for retaining piles according to claim 4, characterized in that: A limiting block is provided at the hinged position of any two adjacent limiting semicircular rings, and under the action of the limiting block, one of the limiting semicircular rings can only rotate upward relative to the other limiting semicircular ring.

6. A two-knife breaking process for retaining piles according to any one of claims 2 to 5, characterized in that: The limiting semicircular ring is arranged as a sawtooth structure along its inner circumference.

Images