Synchronous concentric cement-soil composite inclined bracing piles, inclined bracing and inclined bracing core removal device

Abstract

This invention relates to the field of foundation pit support technology, specifically to a device for removing the inclined brace and core of a synchronous concentric cement-soil composite inclined brace pile. The device includes a rigid pipe body and a tubular liner coaxially arranged on the inner wall of the rigid pipe body. The tubular liner extends along the length of the rigid pipe body and is filled with cement-based material to form the core. In operation, the rigid pipe body is inserted obliquely into the foundation pit, and cement-based material is poured into the tubular liner to form the inclined brace. The top of the inclined brace abuts against the inclined surface of the cap beam. This invention, by setting a heat-melting tubular liner inside the rigid pipe body, allows the rigid pipe body to be removed from the foundation pit after a stable inclined brace structure is formed by injecting cement-based material into the liner. Heating the rigid pipe body melts the tubular liner and lubricates the solidified cement-based material, enabling separation of the cement-based material from the rigid pipe body. This facilitates repeated recycling of the steel pipe, thereby saving construction costs.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, specifically to the bracing of a synchronous concentric cement-soil composite inclined bracing pile. This invention also relates to a device for removing the core of the inclined bracing of a synchronous concentric cement-soil composite inclined bracing pile. Background Technology

[0002] With the development of national economic construction, the construction of underground spaces is becoming increasingly frequent, and the construction technology of foundation pit support systems, which serve to support, reinforce, and protect underground spaces, has also made significant progress. In recent years, to avoid exceeding the building project boundary, relevant policies have prohibited the use of soil anchors for deep foundation pits in soft soil; while the support method using retaining piles plus horizontal inward bracing is relatively expensive; therefore, the combined support method of retaining piles, capping beams, and inclined bracing piles within the foundation pit has gained increasingly widespread application.

[0003] The inclined pile consists of a combined inclined pile extending below the foundation pit floor and a steel pipe inclined brace located above the foundation pit floor; the upper end of the steel pipe inclined brace abuts against the top beam, and the lower end of the steel pipe inclined brace is supported on the upper end of the combined inclined pile; the combined inclined pile consists of a precast concrete square pile in the center and a cement-soil pile wrapped around it.

[0004] Chinese patent CN217629969U discloses a preloaded connection structure between the capping beam and the top of the inclined support pile in a foundation pit support system. It includes a steel bracket fixed to the inner side of the capping beam and having a pressing inclined surface; a jack sleeve whose bottom end is fixed and sealed to the top of the steel support of the inclined support pile; a jack fixed inside the jack sleeve; a sliding sleeve with a top plate fixed to the free end of the jack's piston rod; the top plate is used to press against the inclined surface of the steel bracket; the bottom end of the sliding sleeve slides and seals against the outer wall of the jack sleeve; the jack sleeve wall has a through hole for two oil pipes to pass through and be inserted into the jack's oil pipe joint, and the oil pipes are sealed to the through hole; the piston rod has an external thread, and a locking nut is screwed onto the external thread; the sliding sleeve has an operating hole for a wrench to rotate and tighten the locking nut, and a valve for sealing the operating hole.

[0005] In this preloaded connection structure, after the steel pipe diagonal brace is installed, cement-based material needs to be injected into the steel pipe diagonal brace. Only after the cement-based material solidifies can a stable support structure be formed. Currently, the diagonal brace piles need to be recycled and reused after construction. However, after the existing diagonal brace piles are filled with cement-based material, the cement-based material solidifies in the steel pipe and cannot be removed, thus making it impossible to recycle. Summary of the Invention

[0006] To address the aforementioned issues, a synchronous concentric cement-soil composite inclined support pile is provided. By setting a tubular liner in a rigid pipe body and injecting cement-based material into the tubular liner, a stable inclined support pile can be formed. At the same time, when it is necessary to recycle the rigid pipe, the solidified cement-based material can be removed from the rigid pipe by melting the tubular liner, thus solving the problem that existing steel pipe inclined supports cannot be recycled and reused.

[0007] To address the problems of existing technologies, this invention provides a bracing system for a synchronous concentric cement-soil composite inclined pile, comprising a rigid tube body and a tubular liner coaxially disposed on the inner wall of the rigid tube body. The tubular liner extends along the length of the rigid tube body, and a cement-based material is poured into the tubular liner to form a core. In operation, after the rigid tube body is inserted obliquely into the foundation pit, cement-based material is poured into the tubular liner to form the bracing system. The top of the bracing system abuts against the inclined surface of the cap beam. When it is necessary to recover the rigid tube body, the solidified cement-based material can be removed from the rigid tube body by melting the tubular liner.

[0008] The present invention also provides a device for removing the core of a synchronous concentric cement-soil composite inclined brace pile, comprising a fixing mechanism, a heating mechanism and a core-taking mechanism. The inclined brace is fixedly mounted on the fixing mechanism. The heating mechanism is annularly sleeved on the outer circumference of the inclined brace. The heating mechanism is used to heat the inclined brace to melt the tubular inner lining. The core-taking mechanism is located at the end of the inclined brace to remove the solidified cement-based material.

[0009] Preferably, the coring mechanism includes a feed assembly, a rotary drive, a splicing pipe, a drill bit, and a cutting assembly. The feed assembly is located at the end of the inclined brace and has a movable platform that can move along the length of the inclined brace. The rotary drive is located on the movable platform. One end of the splicing pipe is connected to the working end of the rotary drive, and the other end of the splicing pipe is connected to the drill bit. The cutting assembly is located in the splicing pipe and has a pressure head that can move radially along the inclined brace. In the working state, after the heating mechanism heats and melts the tubular lining located outside the drill passage, the pressure head cuts off the core along the radial direction of the inclined brace. The pressure head moves and abuts against the inner wall of the cut-off core. The feed assembly drives the drill bit and the cut-off core to detach from the rigid tube.

[0010] Preferably, the splicing pipe includes at least two tubular bodies, one end of each tubular body having a first threaded section and the other end of each tubular body having a second threaded section. The first threaded section and the second threaded section can be coaxially threaded together to form the splicing pipe, and the drill bit is disposed at the end of the splicing pipe away from the rotary drive component.

[0011] Preferably, the cutting assembly further includes a hydraulic cylinder and a drive plate. The hydraulic cylinder is coaxially disposed in the splicing pipe and has a drive rod coaxial with the splicing pipe. The drive plate is slidably disposed in the splicing pipe. The outer end of the drive rod is connected to the drive plate in a driving manner. The pressure head penetrates the splicing pipe radially and slides with it. The inner end of the pressure head abuts against the outer side of the drive plate radially along the splicing pipe. The outer side of the drive plate has a first crest. When the pressure head slides on the drive plate, the pressure head acts radially on the inner wall of the tunnel.

[0012] Preferably, the outer side of the drive plate also has a second peak, and the first peak and the second peak are connected by a trough. The height of the second peak is greater than the height of the first peak. When the pressure head slides on the first peak, the trough and the second peak, the pressure head reciprocates along the radial direction of the splicing pipe to impact the inner wall of the drill tunnel.

[0013] Preferably, the core-taking mechanism further includes an internal threaded sleeve, a positioning plate, a positioning rod, and a spring. The internal threaded sleeve is coaxially and fixedly disposed at one end of the splicing pipe, and the drill bit is coaxially screwed into the internal threaded sleeve. The positioning plate is coaxially and fixedly disposed at one end of the internal threaded sleeve. One end of the positioning rod is coaxially and fixedly disposed at one end of the positioning plate. One end of the positioning rod passes through the drive plate and slides with it. The spring is sleeved on the positioning rod and is located between the positioning plate and the drive plate.

[0014] Preferably, the core-taking mechanism further includes a tension spring, and a roller is provided at the inner end of the pressure head. The two ends of the tension spring are respectively connected to the two pressure heads, and the roller elastically abuts against the surface of the drive plate.

[0015] Preferably, the core-taking mechanism includes an injection component and a push-core component. The injection component is disposed at the end of the diagonal brace and has an injection port for injecting high-pressure gas into the tubular inner lining of the diagonal brace. The push-core component is disposed at the end of the diagonal brace and is used to push the solidified cement-based material out of the rigid tube after the tubular inner lining has completely melted and been discharged from the rigid tube.

[0016] Preferably, the gas injection assembly includes a positioning ring, a movable ring, and abutting claws. The positioning ring has an annular sliding cavity coaxial with it. A fixed frame is distributed circumferentially at one end of the positioning ring. The movable ring is slidably disposed coaxially in the annular sliding cavity. A driving claw is distributed circumferentially at one end of the movable ring. The driving claw passes through the positioning ring and slides with it. The abutting claw is slidably disposed radially on the fixed frame. A driving inclined surface is provided on the abutting claw. The driving claw and the driving inclined surface are engaged and slidably fitted. The positioning ring also has a gas injection cavity and a discharge cavity that can communicate with the tubular liner. An air inlet that can communicate with the annular sliding cavity is provided on the gas injection cavity. A valve cylinder is provided on the inner circumference of the movable ring. A valve port that can communicate with the air inlet is provided on the valve cylinder. After high-pressure gas is injected into the annular sliding cavity, the air inlet communicates with the annular sliding cavity through the valve port.

[0017] The advantages of this invention compared to the prior art are:

[0018] 1. This invention provides a heat-melting tubular lining inside a rigid pipe. After cement-based material is injected into the tubular lining to form a stable inclined support structure, the rigid pipe can be removed from the foundation pit. By heating the rigid pipe, the tubular lining melts and lubricates the solidified cement-based material, thereby separating the cement-based material from the rigid pipe. This facilitates the repeated recycling of the steel pipe and saves construction costs.

[0019] 2. This invention facilitates the automated recycling of inclined support piles by placing a rigid tube on a fixed mechanism, melting the tubular lining through a heating mechanism, and removing the molten cement-based material from the steel core tube through a core-taking mechanism, thereby improving recycling efficiency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the inclined bracing of a synchronous concentric cement-soil composite inclined bracing pile in use.

[0021] Figure 2 yes Figure 1 A magnified view of part A.

[0022] Figure 3 This is a perspective view of the first embodiment of the core-taking mechanism in the core removal device of a synchronous concentric cement-soil composite inclined pile.

[0023] Figure 4 This is a cross-sectional view of the first embodiment of the core-taking mechanism in the core removal device of a synchronous concentric cement-soil composite inclined pile.

[0024] Figure 5 yes Figure 4 A magnified view of a portion of point C.

[0025] Figure 6 yes Figure 4 A magnified view of section B.

[0026] Figure 7 This is a three-dimensional diagram of the rotary drive mechanism, assembly pipe, and drill bit in the internal dismantling device of a synchronous concentric cement-soil composite inclined bracing pile.

[0027] Figure 8 This is a three-dimensional diagram of the cut-off component in the core removal device of a synchronous concentric cement-soil composite inclined bracing pile.

[0028] Figure 9 yes Figure 8 A magnified view of a portion of point D.

[0029] Figure 10 This is a schematic diagram of a second embodiment of the core-taking mechanism in a core removal device for a synchronous concentric cement-soil composite inclined pile.

[0030] Figure 11 yes Figure 10 A magnified view of a portion at point E.

[0031] Figure 12 This is a three-dimensional diagram of the air injection component in the internal dismantling device of a synchronous concentric cement-soil composite inclined pile.

[0032] The diagram is labeled as follows: 11-Diagonal brace; 111-Rigid pipe body; 112-Tube lining; 113-Cement-based material; 12-Cover beam; 13-Preloading device; 14-Retaining pile; 15-Base plate; 16-Bedding layer; 17-Waterstop steel plate; 18-Inclined pile; 2-Fixing mechanism; 3-Heating mechanism; 4-Coring mechanism; 41-Feed assembly; 411-Moving table; 42-Rotary drive component; 43-Assembled pipe; 431-First threaded section; 432-Second threaded section; 44-Drill bit; 45-Cutting assembly; 451-Indenter; 452-Hydraulic cylinder; 453-Drive plate; 4531-First crest; 4532-Second crest; 45 33-Valve trough; 4534-Positioning groove; 461-Internal threaded sleeve; 462-Positioning plate; 463-Positioning rod; 464-Spring; 465-Tension spring; 466-Roller; 467-Positioning seat; 47-Injection assembly; 471-Injection port; 472-Positioning ring sleeve; 4721-Annular sliding cavity; 4722-Fixed frame; 4723-Injection chamber; 4724-Discharge chamber; 473-Moving ring; 4731-Drive claw; 4732-Valve cylinder; 4733-Valve port; 474-Abutting claw; 475-Fixed pin; 476-Elastic element; 48-Push core assembly; 481-Long shaft cylinder; 482-Connecting rod; 483-Push head. Detailed Implementation

[0033] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 2 As shown, the present invention provides:

[0035] A type of inclined brace for a synchronous concentric cement-soil composite inclined pile is characterized by comprising a rigid tube 111 and a tubular liner 112 coaxially disposed on the inner wall of the rigid tube 111. The tubular liner 112 extends along the length of the rigid tube 111, and a cement-based material 113 is poured into the tubular liner 112 to form a core. In the working state, after the rigid tube 111 is inserted obliquely into the foundation pit, the cement-based material 113 is poured into the tubular liner 112 to form an inclined brace 11. The top end of the inclined brace 11 abuts against the inclined surface of the cap beam 12. When it is necessary to recover the rigid tube 111, the solidified cement-based material can be removed from the rigid tube 111 by melting the tubular liner 112.

[0036] like Figure 1 As shown, a rigid pipe 111 is inserted obliquely into the foundation pit, and then cement-based material 113 is injected into the tubular liner 112. The material of the tubular liner 112 can be polyethylene, polyvinyl chloride, or other materials that melt when heated. After construction, the steel pipe is removed. By heating the tubular liner 112, a certain gap can be formed between the solidified cement-based material 113 and the inner wall of the rigid pipe 111. At the same time, the molten tubular liner 112 can act as a lubricant, thereby allowing the solidified cement-based material 113 to be removed from the rigid pipe 111, which facilitates the recycling of the steel pipe.

[0037] The melting temperature of the tubular liner 112 is much lower than the annealing temperature of the rigid tube 111, so it will not have any other impact on the structure of the rigid tube 111, thus enabling continuous use and saving resources.

[0038] In this embodiment, a tubular lining 112 that melts upon heating is provided inside the rigid pipe body 111. After cement-based material 113 is injected into the tubular lining 112 to form a stable diagonal bracing structure 11, the rigid pipe body 111 is removed from the foundation pit. By heating the rigid pipe body 111, the tubular lining 112 melts and lubricates the solidified cement-based material 113, thereby enabling the cement-based material 113 to be separated from the rigid pipe body 111. This facilitates the repeated recycling of the steel pipe and saves construction costs.

[0039] like Figure 3 and Figure 4As shown, a device for removing the core of a synchronous concentric cement-soil composite inclined brace pile includes a fixing mechanism 2, a heating mechanism 3, and a core-taking mechanism 4. The inclined brace 11 is fixedly mounted on the fixing mechanism 2. The heating mechanism 3 is annularly sleeved on the outer circumference of the inclined brace 11. The heating mechanism 3 is used to heat the inclined brace 11 to melt the tubular inner lining 112. The core-taking mechanism 4 is located at the end of the inclined brace 11 to remove the solidified cement-based material 113.

[0040] When it is necessary to clean the solidified cement-based material 113 in the rigid pipe 111, the rigid pipe 111 is fixed on the fixing mechanism 2. The heating mechanism 3 is an annular heating ring, which moves along the length of the rigid pipe 111, thereby heating the tubular lining 112 and melting it. Then, the solidified cement-based material 113 is removed from the rigid pipe 111 by the core-taking mechanism 4, thus completing the recycling of the steel pipe.

[0041] In this embodiment, the rigid tube 111 is placed on the fixing mechanism 2, the tubular inner lining 112 is melted by the heating mechanism 3, and the molten cement-based material 113 in the steel core tube is taken out by the core extraction mechanism 4, so as to facilitate the automated recycling of the inclined brace 11 pile and improve the recycling efficiency.

[0042] like Figure 4 and Figure 10 As shown, the coring mechanism 4 includes a feeding assembly 41, a rotary drive 42, a splicing pipe, a drill bit 44, and a cutting assembly 45. The feeding assembly 41 is located at the end of the inclined support 11 and has a moving platform 411 that can move along the length of the inclined support 11. The rotary drive 42 is located on the moving platform 411. One end of the splicing pipe is connected to the working end of the rotary drive 42, and the other end of the splicing pipe is connected to the drill bit 44. The cutting assembly 45 is located in the splicing pipe and has a pressure head 451 that can move radially along the inclined support 11. In the working state, after the heating mechanism 3 heats and melts the tubular liner 112 located outside the drill passage, the pressure head 451 cuts off the core along the radial direction of the inclined support 11. The pressure head 451 moves and abuts against the inner wall of the cut-off core. The feeding assembly 41 drives the drill bit 44 and the cut-off core to detach from the rigid pipe body 111.

[0043] As a first embodiment of the coring assembly in this application, during use, the air intake assembly and rotary drive 42 are activated, causing the splicing pipe to rotate and drive the drill bit 44 to open a drill channel from the end of the cement-based material 113 inward. After drilling a certain distance, the heating mechanism 3 is activated to melt the tubular liner 112 located outside the channel. Then, the cutting assembly 45 is activated to separate the cement-based material 113 with the channel from the core body. At the same time, the feeding assembly 41 is activated, causing the cutting assembly 45 to abut against the separated cement-based material 113, and the pressure head 451 abuts against the inner wall of the separated cement-based material 113 radially. With the lubrication of the feeding assembly 41 and the molten tubular liner 112, the separated cement-based material 113 can be extracted from the rigid tube 111. The above operation is repeated until all the cement-based material 113 is separated from the rigid tube 111.

[0044] like Figure 4 As shown, the splicing pipe includes at least two tubular bodies. One end of each tubular body has a first threaded section 431, and the other end of each tubular body has a second threaded section 432. The first threaded section 431 and the second threaded section 432 can be coaxially threaded together to form the splicing pipe. The drill bit 44 is located at one end of the splicing pipe away from the rotary drive member 42.

[0045] The splicing pipe is composed of at least two tubular bodies, the length of which is longer than that of the rigid pipe 111, so that the drill bit 44 can completely penetrate the cement-based material 113. At the same time, the adjacent tubular bodies are connected by the first threaded section 431 and the second threaded section 432, thereby ensuring the stability of the rotation of the splicing pipe.

[0046] like Figure 5 As shown, the cutting assembly 45 further includes a hydraulic cylinder 452 and a drive plate 453. The hydraulic cylinder 452 is coaxially disposed in the splicing pipe and has a drive rod coaxial with the splicing pipe. The drive plate 453 is slidably disposed in the splicing pipe. The outer end of the drive rod is connected to the drive plate 453 in a transmission manner. The pressure head 451 penetrates the splicing pipe radially and slides with it. The inner end of the pressure head 451 abuts against the outer side of the drive plate 453 radially along the splicing pipe. The outer side of the drive plate 453 has a first crest 4531. When the pressure head 451 slides on the drive plate 453, the pressure head 451 acts radially on the inner wall of the tunnel.

[0047] Due to the characteristics of cement-based material 113, when subjected to strong local forces, cement-based material 113 is prone to cracking along the stress point.

[0048] When it is necessary to cut the cement-based material 113 with channels, the hydraulic cylinder 452 is activated, causing its output shaft to drive the drive plate 453 to move in the splicing pipe. Because the outer side of the drive plate 453 is provided with a first wave peak 4531, and the inner end of the pressure head 451 always abuts against the outer side of the drive plate 453, the pressure head 451 slides on the first wave peak 4531 when the drive plate 453 slides, thereby enabling the outer end of the pressure head 451 to cut the cement-based material 113 radially, so that the cement-based material 113 can be removed in segments.

[0049] like Figure 7 , Figure 8 and Figure 9 As shown, the outer side of the drive plate 453 also has a second peak 4532. The first peak 4531 and the second peak 4532 are connected by a trough 4533. The height of the second peak 4532 is greater than the height of the first peak 4531. When the pressure head 451 slides on the first peak 4531, the trough 4533 and the second peak 4532, the pressure head 451 reciprocates along the radial direction of the splicing pipe to impact the inner wall of the drill tunnel.

[0050] Because the drive plate 453 is also provided with a second wave peak 4532, when the pressure head 451 slides on the first wave peak 4531, the trough 4533 and the second wave peak 4532, the pressure head 451 reciprocates along the radial direction of the splicing pipe to impact the inner wall of the drill channel. At the same time, because the height of the second wave peak 4532 is greater than the height of the first wave peak 4531, the second force of the pressure head 451 on the channel is greater than the first force of the pressure head 451 on the channel, thereby preventing the pressure head 451 from breaking due to excessive force in the first operation.

[0051] like Figure 6 As shown, the core-taking mechanism 4 further includes an internal threaded sleeve 461, a positioning plate 462, a positioning rod 463, and a spring 464. The internal threaded sleeve 461 is coaxially and fixedly disposed at one end of the splicing pipe, and the drill bit 44 is coaxially screwed into the internal threaded sleeve 461. The positioning plate 462 is coaxially and fixedly disposed at one end of the internal threaded sleeve 461. One end of the positioning rod 463 is coaxially and fixedly disposed at one end of the positioning plate 462. One end of the positioning rod 463 passes through the drive plate 453 and slides with it. The spring 464 is sleeved on the positioning rod 463 and is located between the positioning plate 462 and the drive plate 453.

[0052] By placing the internal threaded sleeve 461 at one end of the splicing pipe and then placing the drill bit 44 in the middle of the internal threaded sleeve 461, by placing the positioning plate 462 at the inner end of the internal threaded platform and placing the positioning rod 463 on the positioning plate 462, the positioning rod 463 passes through the drive plate 453 and slides with it, thereby enabling the drive plate 453 to move stably in the splicing pipe. By placing the spring 464 on the positioning rod 463, the drive plate 453 needs to overcome the elastic force of the spring 464 when sliding, thereby improving the stability of the structure.

[0053] like Figure 9 As shown, the core-taking mechanism 4 also includes a tension spring 465, and a roller 466 is provided at the inner end of the pressure head 451. The two ends of the tension spring 465 are respectively connected to the two pressure heads 451, and the roller 466 elastically abuts against the surface of the drive plate 453.

[0054] The core-taking mechanism 4 also includes a positioning seat 467. The drive plate 453 has positioning grooves 4534 extending along its length on both sides. The positioning seat 467 is disposed on the inner wall of the splicing pipe and extends radially along the splicing pipe and slides in cooperation with the positioning grooves 4534.

[0055] The tension spring 465 allows the rollers 466 at the inner ends of the two pressure heads 451 to elastically abut against the outer side of the drive plate 453, thereby preventing the pressure heads 451 from directly detaching from the splicing pipe.

[0056] like Figure 10 As shown, the core-taking mechanism 4 includes an injection assembly 47 and a pusher assembly 48. The injection assembly 47 is disposed at the end of the diagonal brace 11 and has an injection port 471 for injecting high-pressure gas into the tubular inner lining 112 layer of the diagonal brace 11. The pusher assembly 48 is disposed at the end of the diagonal brace 11 and is used to push the solidified cement-based material 113 out of the rigid tube 111 after the tubular inner lining 112 has completely melted and discharged from the rigid tube 111.

[0057] As a second embodiment of the core-taking component in this application, the gas injection component 47 is abutted against one end of the diagonal brace 11, the tubular liner 112 is melted by the heating mechanism 3, and high-pressure gas is injected into the gas injection port 471, so that the molten tubular liner 112 is discharged from the rigid tube 111 under high pressure, and then the solidified cement-based material 113 is pushed out of the rigid tube 111 by the core-pushing component 48.

[0058] The pusher assembly 48 includes a long shaft cylinder 481, a connecting rod 482, and a pusher head 483. The long shaft cylinder 481 is located at the end of the diagonal brace 11, and the two ends of the connecting rod 482 are respectively connected to the output shaft of the long shaft cylinder 481 and the pusher head 483.

[0059] Once the tubular liner 112 has completely melted, the long shaft cylinder 481 is activated, causing the docking rod 482 to push the solidified cement-based grooved wheel out of the rigid tube 111 through the pusher 483.

[0060] like Figure 11 and Figure 12 As shown, the gas injection assembly 47 includes a positioning ring 472, a movable ring 473, and an abutting claw 474. The positioning ring 472 has an annular sliding cavity 4721 coaxial with it. A fixed frame 4722 is distributed circumferentially at one end of the positioning ring 472. The movable ring 473 is slidably disposed coaxially in the annular sliding cavity 4721. A driving claw 4731 is distributed circumferentially at one end of the movable ring 473. The driving claw 4731 penetrates the positioning ring 472 and slides with it. The abutting claw 474 is slidably disposed radially on the fixed frame 4722 along the positioning ring 472. The abutting claw 474 is provided with a driving inclined surface, and the driving claw 4731 is engaged and slidably fitted with the driving inclined surface. The positioning ring sleeve 472 is also provided with an air injection chamber 4723 and a discharge chamber 4724 that can communicate with the tubular inner liner 112. The air injection chamber 4723 is provided with an air inlet that can communicate with the annular sliding chamber 4721. The inner circumference of the movable ring 473 is provided with a valve cylinder 4732, and the valve cylinder 4732 is provided with a valve port 4733 that can communicate with the air inlet. After high-pressure gas is injected into the annular sliding chamber 4721, the air inlet communicates with the annular sliding chamber 4721 through the valve port 4733.

[0061] One end of the movable ring 473 is provided with a fixing pin 475, which passes through the positioning ring sleeve 472. An elastic element 476 is sleeved on the fixing pin 475. Under the action of the elastic force of the elastic element 476, the movable ring 473 abuts against the side of the annular sliding cavity 4721 where the air injection port 471 is provided.

[0062] In use, the positioning ring 472 is abutted against one end of the diagonal brace 11, so that the gas injection chamber 4723 is connected to the high part of the tubular liner 112, and the discharge chamber 4724 is connected to the low part of the tubular liner 112. High-pressure gas is injected into the annular sliding chamber 4721, and the movable ring 473 slides in the annular sliding chamber 4721 against the elastic force. At the same time, the valve port 4733 on the valve cylinder 4732 is connected to the gas injection chamber 4723, so that the high-pressure gas in the annular sliding chamber 4721 can be filled into the gap of the molten tubular liner 112, and the molten tubular liner 112 is discharged outward through the discharge chamber 4724.

[0063] When the movable ring 473 slides, the outer end of the driving claw 4731 is on the driving inclined surface of the abutting claw 474, and the abutting claw 474 slides on the fixed frame 4722. The abutting claw 474 abuts against the outer circumferential surface of the rigid tube 111 in the radial direction, thereby stably connecting the positioning ring sleeve 472 and the rigid tube 111.

[0064] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A device for removing the core of a synchronous concentric cement-soil composite inclined brace pile, wherein the inclined brace (11) comprises a rigid tube (111) and a tubular liner (112) coaxially disposed on the inner wall of the rigid tube (111), wherein the tubular liner (112) is filled with cement-based material (113) to form the core, characterized in that, The device includes a fixing mechanism (2), a heating mechanism (3), and a core-taking mechanism (4). The diagonal brace (11) is fixedly mounted on the fixing mechanism (2). The heating mechanism (3) is annularly sleeved on the outer circumference of the diagonal brace (11). The heating mechanism (3) is used to heat the diagonal brace (11) to melt the tubular inner lining (112). The core-taking mechanism (4) is located at the end of the diagonal brace (11) to remove the solidified cement-based material (113). The coring mechanism (4) includes a feed assembly (41), a rotary drive (42), a splicing pipe, a drill bit (44), and a cutting assembly (45). The feed assembly (41) is located at the end of the inclined support (11) and has a moving platform (411) that moves along the length of the inclined support (11). The rotary drive (42) is mounted on the moving platform (411). One end of the splicing pipe is connected to the working end of the rotary drive (42), and the other end of the splicing pipe is connected to the drill bit. (44) Connection, the cut-off assembly (45) is disposed in the splicing pipe, the cut-off assembly (45) has a pressure head (451) that moves radially along the inclined brace (11). In the working state, after the heating mechanism (3) heats and melts the tubular inner lining (112) located outside the drill duct, the pressure head (451) cuts off the inner core along the radial direction of the inclined brace (11). The pressure head (451) moves and abuts against the inner wall of the cut-off inner core. The feed assembly (41) drives the drill bit (44) and the cut-off inner core to detach from the rigid pipe body (111).

2. The device for removing the core of a synchronous concentric cement-soil composite inclined bracing pile according to claim 1, characterized in that, The splicing pipe includes at least two tubular bodies, one end of which has a first threaded section (431) and the other end of which has a second threaded section (432). The first threaded section (431) and the second threaded section (432) are coaxially threaded together to form the splicing pipe. The drill bit (44) is located at one end of the splicing pipe away from the rotary drive (42).

3. The device for removing the core of a synchronous concentric cement-soil composite inclined brace pile according to claim 1, characterized in that, The cutting assembly (45) further includes a hydraulic cylinder (452) and a drive plate (453). The hydraulic cylinder (452) is coaxially disposed in the splicing pipe. The hydraulic cylinder (452) has a drive rod coaxial with the splicing pipe. The drive plate (453) is slidably disposed in the splicing pipe. The outer end of the drive rod is connected to the drive plate (453) in a transmission manner. The pressure head (451) penetrates the splicing pipe radially and slides with it. The inner end of the pressure head (451) abuts against the outer side of the drive plate (453) radially along the splicing pipe. The outer side of the drive plate (453) has a first crest (4531). When the pressure head (451) slides on the drive plate (453), the pressure head (451) acts radially on the inner wall of the tunnel.

4. The device for removing the core of a synchronous concentric cement-soil composite inclined bracing pile according to claim 3, characterized in that, The drive plate (453) also has a second peak (4532) on its outer side. The first peak (4531) and the second peak (4532) are connected by a trough (4533). The height of the second peak (4532) is greater than the height of the first peak (4531). When the pressure head (451) slides on the first peak (4531), the trough (4533) and the second peak (4532), the pressure head (451) reciprocates along the radial direction of the splicing pipe to impact the inner wall of the drill tunnel.

5. The device for removing the core of a synchronous concentric cement-soil composite inclined brace pile according to claim 3, characterized in that, The core-taking mechanism (4) further includes an internal threaded sleeve (461), a positioning plate (462), a positioning rod (463), and a spring (464). The internal threaded sleeve (461) is coaxially and fixedly disposed at one end of the splicing pipe. The drill bit (44) is coaxially screwed into the internal threaded sleeve (461). The positioning plate (462) is coaxially and fixedly disposed at one end of the internal threaded sleeve (461). One end of the positioning rod (463) is coaxially and fixedly disposed at one end of the positioning plate (462). One end of the positioning rod (463) passes through the drive plate (453) and slides with it. The spring (464) is sleeved on the positioning rod (463) and is located between the positioning plate (462) and the drive plate (453).

6. The device for removing the core of a synchronous concentric cement-soil composite inclined brace pile according to claim 3, characterized in that, The core-taking mechanism (4) also includes a tension spring (465), and a roller (466) is provided at the inner end of the pressure head (451). The two ends of the tension spring (465) are respectively connected to the two pressure heads (451), and the roller (466) elastically abuts against the surface of the drive plate (453).

7. The device for removing the core of a synchronous concentric cement-soil composite inclined brace pile according to claim 1, characterized in that, The core-taking mechanism (4) includes an injection assembly (47) and a pusher assembly (48). The injection assembly (47) is located at the end of the diagonal brace (11) and has an injection port (471) for injecting high-pressure gas into the tubular liner (112) layer of the diagonal brace (11). The pusher assembly (48) is located at the end of the diagonal brace (11) and is used to push the solidified cement-based material (113) out of the rigid tube (111) after the tubular liner (112) has completely melted and discharged from the rigid tube (111).

8. The device for removing the core of a synchronous concentric cement-soil composite inclined brace pile according to claim 7, characterized in that, The gas injection assembly (47) includes a positioning ring sleeve (472), a movable ring (473), and an abutment claw (474). The positioning ring sleeve (472) has an annular sliding cavity (4721) coaxial with it. A fixed frame (4722) is distributed circumferentially at one end of the positioning ring sleeve (472). The movable ring (473) is slidably disposed coaxially in the annular sliding cavity (4721). A driving claw (4731) is distributed circumferentially at one end of the movable ring (473). The driving claw (4731) penetrates the positioning ring sleeve (472) and slides with it. The abutment claw (474) is slidably disposed radially on the fixed frame (4722) along the positioning ring sleeve (472). The abutting claw (474) is provided with a driving inclined surface, and the driving claw (4731) is engaged and slidably fitted with the driving inclined surface. The positioning ring sleeve (472) is also provided with an air injection chamber (4723) and a discharge chamber (4724) communicating with the tubular liner (112). The air injection chamber (4723) is provided with an air inlet communicating with the annular sliding chamber (4721). The inner circumference of the movable ring (473) is provided with a valve cylinder (4732), and the valve cylinder (4732) is provided with a valve port (4733) communicating with the air inlet. After high-pressure gas is injected into the annular sliding chamber (4721), the air inlet communicates with the annular sliding chamber (4721) through the valve port (4733).

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