A high-pressure grouting device

Abstract

The application discloses a high-pressure grouting device, which comprises a drill rod and a grouting pipe; the drill rod comprises a rod body, a drill bit fixed at the lower end of the rod body, and a sleeve fixed at the top surface of the drill bit and located in the rod body; the outer periphery of the drill rod is provided with a grouting pipe, the inner periphery of the drill rod is provided with a baffle for blocking the grouting pipe, the baffle is connected to the sleeve through a pressure spring, the side surface of the baffle is provided with a conveying pipe, the outer periphery of the sleeve is provided with a secondary grouting pipe, and the secondary grouting pipe is connected to the conveying pipe; the grouting pipe can be inserted into the rod body and detachably connected to the sleeve through a locking plate. The lower end of the rod body is closed by the drill bit, the grouting pipe is connected to the sleeve, the drill rod and the sleeve are connected through a pipeline, and the transportation of slurry is realized, so that the slurry can be smoothly sprayed, the phenomenon that the grouting pipe extends to the outside of the rod body is avoided, the direct contact between the grouting pipe and various materials in the drill hole is avoided, and the probability of damage of the grouting pipe is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of high-pressure grouting technology, and specifically relates to a high-pressure grouting device. Background Technology

[0002] High-pressure jet grouting is a construction method developed from chemical grouting, employing high-pressure water jet cutting technology. A drilling rig is used to drill holes, and a grouting pipe with a nozzle is inserted to a predetermined position in the soil layer. High-pressure equipment then propels the grout into a high-pressure jet of over 20 MPa, impacting and breaking down the soil. Some fine soil particles rise to the surface with the grout, while the remaining soil particles are mixed with the grout under the impact force, centrifugal force, and gravity of the jet stream, and rearranged in a specific grout-to-soil ratio. After the grout solidifies, it forms a consolidated body within the soil, which, together with the soil between the piles, constitutes a composite foundation, thereby increasing the bearing capacity of the foundation, reducing foundation deformation, and achieving the purpose of foundation reinforcement.

[0003] The existing high-pressure jet grouting method has the following problems when used: the grouting pipe is inserted into the drill rod, and the nozzle at the lower end of the grouting pipe extends outside the drill rod so that the grout is sprayed out and impacts the soil. Based on this, the grout is sprayed out, but the grouting pipe is exposed outside the drill rod and comes into direct contact with the material in the hole, making it easy to be damaged. After the grouting pipe is damaged, the machine needs to be stopped for replacement, which delays the construction progress. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure grouting device to solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-pressure grouting device includes a drilling rig, a drill rod, and a grouting pipe. The drilling rig is used to drive the drill rod to drill and to spray grout. The drill rod is detachably connected to the drilling rig.

[0007] The drill rod includes a rod body, a drill bit fixed to the lower end of the rod body, and a sleeve fixed to the top surface of the drill bit and located inside the rod body. The drill rod has a grouting pipe on its outer periphery and a baffle for sealing the grouting pipe on its inner periphery. The side of the baffle facing the grouting pipe is the sealing surface, and the side of the baffle away from the grouting pipe is the pressure surface. The pressure surface is connected to the sleeve through a pressure spring. The side of the baffle has a delivery pipe, and the outer periphery of the sleeve has a secondary grouting pipe connected to the delivery pipe.

[0008] The grouting pipe can be inserted into the rod body and detachably connected to the sleeve through the locking plate. When the grouting pipe is connected to the sleeve, the grout flows through the sleeve, the auxiliary grouting pipe and the delivery pipe in sequence and pushes the baffle to connect the grouting pipe and spray the grout outward.

[0009] In one possible design, the baffle includes a main plate and a sub-plate. The main plate is connected to the sleeve via a pressure spring. The sub-plate is slidably mounted on the main plate via a first reset spring and is used to control the opening and closing of the slurry pipe. The side of the sub-plate is aligned with the outlet of the delivery pipe, and the sub-plate can move under the push of the slurry.

[0010] In one possible design, the socket includes a base fixed to the top surface of the drill bit and a cylinder rotatably mounted on the base, with a locking structure between the base and the cylinder.

[0011] A clamping block is provided on the outer periphery of the cylinder. The side of the clamping block facing the baffle is an involute surface with an involute shape, so that the tension of the pressure spring can be adjusted by rotating the cylinder.

[0012] Accordingly, the auxiliary shotcrete pipe includes a first pipe body and a second pipe body connected to each other. The first pipe body is located between the cylinder and the conveying pipe, and the second pipe body is slidably disposed inside the conveying pipe. The conveying pipe is provided with an arc-shaped groove for the movement of the first pipe body, and the length of the second pipe body is greater than the length of the arc-shaped groove.

[0013] In one possible design, the locking structure includes a locking rod slidably disposed on the cylinder and a locking hole disposed on the base. The locking rod is connected to the cylinder via a second return spring. The bottom of the locking hole is provided with a magnetic attraction part, which is used to pull the locking rod into the locking hole.

[0014] In one possible design, the bottom of the cylinder is provided with an inner auxiliary ring and an outer auxiliary ring. The inner auxiliary ring is fixedly connected to the cylinder, and the outer auxiliary ring is sleeved on the outside of the inner auxiliary ring and fixed to the drill bit. The outer auxiliary ring is provided with an arc-shaped switching groove.

[0015] The outer periphery of the grouting pipe is provided with a fixing ring, and the locking plate is fixed on the bottom surface of the fixing ring. The locking plate extends downward and is inserted into the switch groove. The locking plate can slide in the switch groove and control the connection and separation of the locking rod and the locking hole.

[0016] In one possible design, the switch slot has a first locking end and a second locking end opposite to each other, with a locking rod and a locking hole disposed adjacent to the first locking end;

[0017] The part of the locking plate that is inserted into the switch slot has a socket. The inner side of the locking plate has a limiting plate. The locking plate and the limiting plate are detachably connected. The limiting plate has an outwardly protruding connecting block. The inner additional ring has an arc-shaped additional groove that fits the connecting block. The limiting plate also has a retaining ring and a secondary socket. The retaining ring is used to prevent the locking rod from disengaging from the locking hole. When the secondary socket connects the locking rod and the socket, the locking rod disengages from the locking hole and is inserted into the socket.

[0018] The second locking end is provided with an outward protruding rod, and the base is provided with a secondary locking hole located on the opposite side of the outward protruding rod. When the locking plate slides to the second locking end, the outward protruding rod is used to push the locking rod into the secondary locking hole. Correspondingly, the locking plate is provided with a sliding inclined surface adapted to the outward protruding rod to guide the outward protruding rod to slide from the end face of the locking plate to the insertion hole. The secondary locking hole is provided with a secondary magnetic attraction part, which is used to push the locking rod out from the secondary locking hole.

[0019] In one possible design, the locking plate has an inner groove on the side facing the limiting plate, and the limiting plate has an outer protrusion on the side facing the locking plate, the outer protrusion being able to be inserted into the inner groove.

[0020] In one possible design, the end of the protruding rod facing the switch slot is constructed in an arc shape, and the end of the protruding rod facing the outer auxiliary ring is connected to the outer auxiliary ring through a third reset spring.

[0021] In one possible design, the drilling rig is connected to a feeding system that delivers cement, water, and / or air.

[0022] In one possible design, when the feeding system delivers cement, the feeding system includes a mixer and a mud pump; when the feeding system delivers cement and water, the feeding system includes a mixer, a mud pump, and a clean water pump; when the feeding system delivers cement, water, and air, the feeding system includes a mixer, a mud pump, a clean water pump, and an air compressor.

[0023] Beneficial effects:

[0024] The high-pressure grouting device improves the structure of the drill rod by sealing the lower end of the rod body through the drill bit and connecting the grouting pipe through the sleeve. The drill rod and the sleeve are connected by a pipeline to transport the grout, ensuring that the grout is sprayed out smoothly. This not only ensures the normal progress of the grouting operation, but also avoids the phenomenon of the grouting pipe extending outside the rod body, avoids direct contact between the grouting pipe and various materials in the borehole, and effectively reduces the probability of damage to the grouting pipe.

[0025] Based on this, the number and frequency of downtime caused by grouting pipe damage were reduced, downtime was shortened, construction time was increased, and the construction progress was ensured to meet expectations. At the same time, the reduction in grouting pipe damage effectively reduced the time, manpower, and economic costs required for maintenance and replacement, improved economic efficiency, and helped to reduce construction costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the assembly of the drill rod and the grouting pipe.

[0027] Figure 2 for Figure 1 A schematic diagram of the structure of section AA.

[0028] Figure 3This is a schematic diagram of the assembly of the conveying pipe and the baffle.

[0029] Figure 4 This is a schematic diagram of the baffle structure.

[0030] Figure 5 This is a schematic diagram of the assembly of the sleeve and the grouting pipe.

[0031] Figure 6 This is a schematic diagram of the locking plate.

[0032] Figure 7 This is a schematic diagram of the limiting plate.

[0033] Figure 8 This is a schematic diagram of the structure when the locking plate is located at the first locking end of the switch slot.

[0034] Figure 9 This is a schematic diagram of the structure where the locking plate is located between the first locking end and the second locking end of the switch slot.

[0035] Figure 10 This is a schematic diagram of the structure when the locking plate is located at the second locking end of the switch slot.

[0036] In the picture:

[0037] 1. Drill rod; 11. Rod body; 12. Drill bit; 13. Sleeve sleeve; 131. Base; 132. Cylinder body; 101. Grouting pipe; 102. Clamping block; 103. Locking rod; 104. Locking hole; 105. Inner auxiliary ring; 106. Outer auxiliary ring; 107. Switch groove; 108. Auxiliary groove; 109. Outer protruding rod; 110. Secondary locking hole; 2. Grouting pipe; 3. Baffle plate 31. Main board; 32. Sub-board; 4. Pressure spring; 5. Conveying pipe; 501. Arc groove; 6. Secondary spraying pipe; 61. First pipe body; 62. Second pipe body; 7. Locking plate; 711. Insertion hole; 712. Sliding inclined surface; 713. Inner groove; 72. Limiting plate; 721. Connecting block; 722. Retaining ring; 723. Secondary insertion hole; 724. Outer protrusion; 8. Fixing ring. Detailed Implementation

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0039] Example:

[0040] To address the problems existing in the prior art, the present invention provides a high-pressure grouting device. The high-pressure grouting device improves the structure of the drill rod 1. The lower end of the rod body 11 is sealed by the drill bit 12, and the grouting pipe 2 is connected by the sleeve 13. The drill rod 1 and the sleeve 13 are connected by a pipeline to realize the transportation of grout, ensuring that the grout is sprayed out smoothly. This not only ensures the normal progress of the grouting operation, but also avoids the phenomenon of the grouting pipe 2 extending outside the rod body 11, avoids direct contact between the grouting pipe 2 and various materials in the borehole, and effectively reduces the probability of damage to the grouting pipe 2.

[0041] Based on this, the number and frequency of downtime caused by damage to grouting pipe 2 were reduced, downtime was shortened, construction time was increased, and the construction progress was ensured to meet expectations. At the same time, the reduction in damage to grouting pipe 2 effectively reduced the time, manpower and economic costs required for maintenance and replacement, improved economic efficiency, and helped to reduce construction costs.

[0042] like Figures 1 to 10 As shown, a high-pressure grouting device includes a drilling rig, a drill rod 1 and a grouting pipe 2. The drilling rig is used to drive the drill rod 1 to drill and to spray grout. The drill rod 1 is detachably connected to the drilling rig.

[0043] The drill rod 1 includes a rod body 11, a drill bit 12 fixed to the lower end of the rod body 11, and a sleeve 13 fixed to the top surface of the drill bit 12 and located inside the rod body 11. The drill rod 1 has a grouting pipe 101 on its outer periphery and a baffle 3 for sealing the grouting pipe 101 on its inner periphery. The side of the baffle 3 facing the grouting pipe 101 is the sealing surface, and the side of the baffle 3 facing away from the grouting pipe 101 is the pressure surface. The pressure surface is connected to the sleeve 13 through a pressure spring 4. The side of the baffle 3 has a conveying pipe 5. The outer periphery of the sleeve 13 has a secondary grouting pipe 6, which is connected to the conveying pipe 5.

[0044] The grouting pipe 2 can be inserted into the rod body 11 and detachably connected to the sleeve 13 through the locking plate 7. When the grouting pipe 2 is connected to the sleeve 13, the grout flows through the sleeve 13, the auxiliary grouting pipe 6 and the conveying pipe 5 in sequence and pushes the baffle 3 to connect the grouting pipe 101 and spray the grout outward.

[0045] The drilling rig can be any suitable commercially available model, and this invention does not impose any restrictions on it. In the drill rod 1, the rod body 11 has any suitable diameter. The drill bit 12 is fixedly connected to the rod body 11 and seals the lower opening of the rod body 11; the drill bit 12 also serves as the base for installing the sleeve 13. The sleeve 13 is used to connect the grouting pipe 2, and considering the high pressure during grouting, the sleeve 13 and the grouting pipe 2 are connected by a locking plate 7 to prevent the sleeve 13 from detaching from the grouting pipe 2 under pressure.

[0046] The grouting pipe 101 is connected to the sleeve 13 via the delivery pipe 5 and the auxiliary grouting pipe 6. The sleeve 13 also forms an output channel for outputting grout. The grout is sprayed outward through the injection pipe 2 and the output channel. The grout outlet of the grouting pipe 101 is located in the vertically upward projection plane of the drill bit 12. Based on this, the drill bit 12 protects the grouting pipe 101 during drilling, so that the material that the grouting pipe 101 contacts is soil particles that have been drilled, reducing the probability of damage to the grouting pipe 101.

[0047] Meanwhile, the output channel remains open to facilitate the ejection of grout. However, soil particles generated during drilling can also flow into the output channel, causing pressure loss in the borehole. Therefore, a baffle 3 is installed inside the rod 11. The baffle 3 is connected to the sleeve 13 via a pressure spring 4, and the spring force provided by the pressure spring 4 seals the grouting pipe 101, thus keeping the output channel open and preventing soil particles from entering during drilling. Conversely, when grout is being ejected, the high pressure of the grout pushes the baffle 3 to open the output channel, allowing the grout to be ejected.

[0048] The working process of the high-pressure grouting device is basically the same as that of existing equipment, the difference being the connection of the grouting pipe 2: the connection of existing equipment has been described in the background art and will not be repeated here. In the high-pressure grouting device, the grouting pipe 2 is inserted into the rod body 11 and moves downward to the sleeve 13. The lower end of the grouting pipe 2 is inserted into the sleeve 13, and the grouting pipe 2 is fixed by the locking plate 7. The grout introduced into the grouting pipe 2 is sprayed out after passing through the auxiliary spraying pipe 6, the conveying pipe 5 and the spraying pipe 101 in sequence, and the grout pushes the baffle 3 when it flows through the baffle 3.

[0049] In this embodiment, the baffle 3 includes a main plate 31 and a sub-plate 32. The main plate 31 is connected to the sleeve 13 through a pressure spring 4. The sub-plate 32 is slidably mounted on the main plate 31 through a first reset spring and is used to control the opening and closing of the slurry pipe 101. The side of the sub-plate 32 is aligned with the outlet of the delivery pipe 5. The sub-plate 32 can move under the push of the slurry.

[0050] Based on the above design, the sub-plate 32 is used to seal the grout inlet of the shotcrete pipe 101, and the main plate 31 abuts against the inner circumference of the rod body 11 and covers the sub-plate 32 to form a relatively closed structure and guide the grout into the shotcrete pipe 101, improving the sealing performance and preventing the grout from flowing into the rod body 11 after the sub-plate 32 is moved. At the same time, a first return spring is provided, so that when the grout pressure disappears, the sub-plate 32 will automatically return to its original position under the elastic force of the first return spring.

[0051] Furthermore, the smaller contact area of ​​the subplate 32 with the slurry reduces the hydraulic action area of ​​the slurry, which helps improve the efficiency of moving the subplate 32. Meanwhile, if the baffle 3 is designed as a single unit, its location will also have a structure with the same function as the main plate 31 to prevent slurry from flowing into the rod 11. Thus, miniaturization is achieved by disassembling the baffle 3 structure.

[0052] Due to varying geological conditions, different drill rod specifications 1, and different drilling parameters, the pressure required for the baffle 3 differs. This pressure is provided by the pressure spring 4. Therefore, replacing the pressure spring 4 or adjusting its deformation are possible adjustment methods. Given the relatively enclosed structure of the sleeve 13, replacing the pressure spring 4 would require directly replacing the drill rod 1. Therefore, adjusting the deformation of the pressure spring 4 is preferred to allow the same drill rod 1 to adapt to more construction conditions, thus improving its practicality. Based on this:

[0053] like Figure 1 and Figure 5 As shown, the sleeve 13 includes a base 131 fixed on the top surface of the drill bit 12 and a cylinder 132 rotatably mounted on the base 131. A locking structure is provided between the base 131 and the cylinder 132.

[0054] A clamping block 102 is provided on the outer periphery of the cylinder 132. The side of the clamping block 102 facing the baffle 3 has an involute cross-section, so as to adjust the tension of the pressure spring 4 by rotating the cylinder 132.

[0055] Based on the above design, the sleeve 13 includes a base 131 and a cylinder 132. The cylinder 132 can rotate around the base 131. The outer periphery of the cylinder 132 is connected to the pressure spring 4 through the clamping block 102. The connection surface between the clamping block 102 and the pressure spring 4 is an involute surface. As the cylinder 132 rotates, the distance between the baffle 3 and the clamping block 102 increases or decreases. Correspondingly, the pressure spring 4 also contracts or extends to adjust the deformation.

[0056] Furthermore, when grouting using the jet grouting method, the sleeve 13 will rotate with the drill rod 1. Therefore, a locking structure is set to connect the base 131 and the cylinder 132 as a whole, so that the pressure spring 4 maintains a stable deformation and there is no need to worry about the baffle 3 pressure being too low, causing soil particles to intrude. That is, when adjusting the deformation of the pressure spring 4 before construction, the locking structure is loosened to allow the cylinder 132 to rotate; during construction, the locking structure is tightened to prevent the cylinder 132 from rotating.

[0057] The auxiliary shotcrete pipe 6 is connected to the cylinder 132, so the rotation of the cylinder 132 will also drive the auxiliary shotcrete pipe 6 to rotate, such as... Figure 3As shown, the auxiliary shotcrete pipe 6 includes a first pipe body 61 and a second pipe body 62 connected to each other. The first pipe body 61 is located between the cylinder 132 and the conveying pipe 5. The second pipe body 62 is slidably disposed in the conveying pipe 5. The conveying pipe 5 is provided with an arc-shaped groove 501 for the movement of the first pipe body 61, and the length of the second pipe body 62 is greater than the length of the arc-shaped groove 501.

[0058] Based on this, an arc-shaped groove 501 is provided on the conveying pipe 5 to allow the first pipe body 61 to rotate, so there is no need to worry about the conveying pipe 5 blocking the movement of the auxiliary spraying pipe 6. At the same time, the second pipe body 62 is inserted inside the conveying pipe 5, and the length of the second pipe body 62 is greater than the length of the arc-shaped groove 501. The outlet of the second pipe body 62 will not connect to the outside through the arc-shaped groove 501, thus preventing the slurry from leaking from the arc-shaped groove 501 into the rod body 11 and ensuring that the slurry is sprayed out smoothly.

[0059] In this embodiment, the locking structure includes a locking rod 103 slidably disposed on the cylinder 132 and a locking hole 104 disposed on the base 131. The locking rod 103 is connected to the cylinder 132 through a second return spring. The bottom of the locking hole 104 is provided with a magnetic attraction part, which is used to pull the locking rod 103 into the locking hole 104.

[0060] Based on the above design, when the magnetic attraction part is activated, it generates magnetic force. This magnetic force acts on the locking rod 103 and overcomes the elastic force of the second return spring, pulling the locking rod 103 to the locking hole 104, connecting the base 131 to the cylinder 132. Conversely, when the magnetic attraction part is closed and the magnetic force disappears, the locking rod 103 disengages from the locking hole 104 under the action of the second return spring, separating the base 131 from the cylinder 132. Optionally, multiple sets of locking rods 103 and locking holes 104 can be provided to increase the number of fixing points and improve the fixing effect.

[0061] Furthermore, it is known that when adjusting the deformation of the pressure spring 4 before construction, the locking structure is loosened to allow the cylinder 132 to rotate; during construction, the locking structure is tightened to prevent the cylinder 132 from rotating. This means the magnetic suction unit is in operation most of the time, significantly increasing power consumption and energy consumption. Also, since the sleeve 13 is located at the bottom of the rod 11, rotating the cylinder 132 can be achieved by inserting the grouting pipe 2 into the rod 11. Based on this, further improvements to the structure of the grouting pipe 2 are needed to reduce energy consumption and control the rotation of the cylinder 132. Specifically:

[0062] like Figures 8 to 10 As shown, the bottom of the cylinder 132 is provided with an inner auxiliary ring 105 and an outer auxiliary ring 106. The inner auxiliary ring 105 is fixedly connected to the cylinder 132, and the outer auxiliary ring 106 is sleeved on the outside of the inner auxiliary ring 105 and fixed on the drill bit 12. The outer auxiliary ring 106 is provided with an arc-shaped switch groove 107.

[0063] A fixing ring 8 is provided on the outer periphery of the grouting pipe 2. The locking plate 7 is fixed on the bottom surface of the fixing ring 8. The locking plate 7 extends downward and is inserted into the switch groove 107. The locking plate 7 can slide in the switch groove 107 and control the connection and separation of the locking rod 103 and the locking hole 104.

[0064] Based on the above design, an inner additional ring 105 and an outer additional ring 106 are used to form a switch groove 107 for the locking plate 7 to rotate. The locking plate 7 is inserted into the switch groove 107 and can move along the switch groove 107. The movement of the locking plate 7 controls the connection and separation of the locking rod 103 and the locking hole 104, so as to shorten the working time of the magnetic suction part and reduce energy consumption. The locking rod 103 also realizes the connection between the grouting pipe 2 and the cylinder 132, thus expanding the function of the locking rod 103.

[0065] Specifically, the switch slot 107 has a first locking end and a second locking end opposite to each other, and the locking rod 103 and the locking hole 104 are disposed adjacent to the first locking end;

[0066] The portion of the locking plate 7 that is inserted into the switch slot 107 has an insertion hole 711. The inner side of the locking plate 7 has a limiting plate 72. The locking plate 7 and the limiting plate 72 are detachably connected. The limiting plate 72 has an outwardly protruding connecting block 721. The inner additional ring 105 has an arc-shaped additional groove 108 adapted to the connecting block 721. The limiting plate 72 has a retaining ring 722 and a secondary insertion hole 723. The retaining ring 722 is used to prevent the locking rod 103 from disengaging from the locking hole 104. When the secondary insertion hole 723 connects the locking rod 103 and the insertion hole 711, the locking rod 103 disengages from the locking hole 104 and is inserted into the insertion hole 711.

[0067] The second locking end is provided with an outward protruding rod 109, and the base 131 is provided with a secondary locking hole 110 located on the opposite side of the outward protruding rod 109. When the locking plate 7 slides to the second locking end, the outward protruding rod 109 is used to abut the locking rod 103 into the secondary locking hole 110. Correspondingly, the locking plate 7 is provided with a sliding inclined surface 712 adapted to the outward protruding rod 109 to guide the outward protruding rod 109 to slide from the end face of the locking plate 7 to the insertion hole 711. The secondary locking hole 110 is provided with a secondary magnetic attraction part, which is used to push the locking rod 103 out from the secondary locking hole 110.

[0068] Based on the above design, the locking plate 7 is inserted into the first locking end of the switch slot 107 and connected to the limiting plate 72. While the locking plate 7 moves along the switch slot 107, it drives the limiting plate 72 to move. The movement of the limiting plate 72 can be divided into two parts. One is to slide along the auxiliary slot 108. The limiting plate 72 moves a certain distance relative to the inner auxiliary ring 105 so that one of the retaining ring part 722 and the secondary insertion hole 723 is aligned with the locking rod 103. When the retaining ring part 722 is aligned with the locking rod 103, the locking rod 103 is blocked by the retaining ring part 722 and inserted into the locking hole 104. When the secondary insertion hole 723 is aligned with the locking rod 103, the locking rod 103 is disengaged from the locking hole 104 under the action of the second return spring and moves into the secondary insertion hole 723. The insertion hole 711 is connected to the secondary insertion hole 723, so the end of the locking rod 103 passes through the insertion hole 711. Secondly, it moves together with the locking plate 7. That is, after the locking plate 7 and the limiting plate 72 are connected by the locking rod 103, the two rotate together, and the connecting block 721 abuts against the end of the auxiliary groove 108 to drive the inner auxiliary ring 105 and the cylinder 132 to rotate, thus achieving the purpose of driving the cylinder 132 to rotate through the grouting pipe 2.

[0069] After the cylinder 132 rotates and the deformation of the pressure spring 4 is adjusted, the position of the cylinder 132 needs to be fixed again so that the base 131 and the cylinder 132 are connected as one unit. That is, during the process of the locking plate 7 rotating to the second locking end of the switch groove 107, the protruding rod 109 contacts the locking plate 7 through the sliding inclined surface 712 and is pushed by the locking plate 7. When the protruding rod 109 gradually moves to the insertion hole 711, the locking rod 103 aligns with the secondary locking hole 110. The protruding rod 109 abuts against the locking rod 103 and pushes the locking rod 103 into the secondary locking hole 110 so as to connect the locking plate 7, the cylinder 132 and the base 131 through the locking rod 103, so that the grouting pipe 2 and the sleeve 13 rotate together.

[0070] During reset, the secondary magnetic attraction unit is activated to generate magnetic force, which acts as a thrust to push the locking rod 103 out of the secondary locking hole 110. The locking plate 7 rotates towards the first locking end, thus disengaging the locking rod 103 from the secondary locking hole 110. The protruding rod 109 moves from the insertion hole 711 to the sliding inclined surface 712. After the locking plate 7 is removed, the secondary magnetic attraction unit stops working.

[0071] When the locking plate 7 rotates to the vicinity of the first locking end, the magnetic attraction part is activated to generate magnetic force. When the locking rod 103 is aligned with the locking hole 104, the magnetic force attracts the locking rod 103 and pulls it into the locking hole 104, thereby releasing the connection between the locking plate 7, the limiting plate 72, and the inner auxiliary ring 105. Continue to rotate the locking plate 7 so that it drives the limiting plate 72 to rotate along the auxiliary groove 108, so that the retaining ring part 722 of the limiting plate 72 is aligned with the locking rod 103. The locking rod 103 remains inserted in the locking hole 104. The locking plate 7 can also be lifted to disengage from the switching groove 107, that is, to release the connection between the grouting pipe 2 and the sleeve 13.

[0072] In one possible implementation, the locking plate 7 has an inner groove 713 on the side facing the limiting plate 72, and the limiting plate 72 has an outer protrusion 724 on the side facing the locking plate 7. The outer protrusion 724 can be inserted into the inner groove 713. Based on the above design, the locking plate 7 and the limiting plate 72 are connected to the inner groove 713 by the outer protrusion 724, which is similar to a mortise and tenon structure. The structure is simple and easy to manufacture.

[0073] In one possible implementation, the end of the protruding rod 109 facing the switch slot 107 is constructed in an arc shape, and the end of the protruding rod 109 facing the outer auxiliary ring 106 is connected to the outer auxiliary ring 106 via a third return spring. Based on the above design, the protruding rod 109 is connected to the third return spring. When the protruding rod 109 moves along the sliding inclined plane 712, the third return spring extends or retracts to change the length of the protruding rod 109 within the switch slot 107, so that the protruding rod 109 can smoothly move into or out of the socket 711.

[0074] In one possible implementation, the drilling rig is connected to a feeding system that delivers cement, water, and / or air. Based on the above design schemes, corresponding to single-pipe, double-pipe, and triple-pipe systems, construction personnel can choose according to actual construction conditions. Specifically: when the feeding system delivers cement, it includes a mixer and a mud pump; when it delivers cement and water, it includes a mixer, a mud pump, and a clean water pump; when it delivers cement, water, and air, it includes a mixer, a mud pump, a clean water pump, and an air compressor.

[0075] It is easy to understand that any suitable commercially available model can be selected for the mixer, mud pump, water pump and air compressor, etc. Their working principle and connection method are conventional technical means well known to those skilled in the art, and will not be described in detail here.

[0076] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A high-pressure grouting device, characterized in that, Includes a drilling rig, a drill rod (1) and a grouting pipe (2). The drilling rig is used to drive the drill rod (1) to drill and to spray grout. The drill rod (1) is detachably connected to the drilling rig. The drill rod (1) includes a rod body (11), a drill bit (12) fixed at the lower end of the rod body (11), and a sleeve (13) fixed on the top surface of the drill bit (12) and located inside the rod body (11). The drill rod (1) is provided with a grouting pipe (101) on its outer periphery and a baffle (3) for sealing the grouting pipe (101) on its inner periphery. The side of the baffle (3) facing the grouting pipe (101) is the sealing surface, and the side of the baffle (3) facing away from the grouting pipe (101) is the pressure surface. The pressure surface is connected to the sleeve (13) through a pressure spring (4). The side of the baffle (3) is provided with a conveying pipe (5), and the outer periphery of the sleeve (13) is provided with a secondary grouting pipe (6). The secondary grouting pipe (6) is connected to the conveying pipe (5). The grouting pipe (2) can be inserted into the rod body (11) and detachably connected to the sleeve (13) through the locking plate (7). When the grouting pipe (2) is connected to the sleeve (13), the grout flows through the sleeve (13), the auxiliary grouting pipe (6) and the conveying pipe (5) in sequence and pushes the baffle (3) to connect the grouting pipe (101) and spray the grout outward. The baffle (3) includes a main plate (31) and a sub-plate (32). The main plate (31) is connected to the sleeve (13) via a pressure spring (4). The sub-plate (32) is slidably mounted on the main plate (31) via a first reset spring and is used to control the opening and closing of the slurry pipe (101). The side of the sub-plate (32) is aligned with the outlet of the delivery pipe (5). The sub-plate (32) can move under the push of the slurry.

2. The high-pressure grouting device according to claim 1, characterized in that, The sleeve (13) includes a base (131) fixed on the top surface of the drill bit (12) and a cylinder (132) rotatably mounted on the base (131). A locking structure is provided between the base (131) and the cylinder (132). A clamping block (102) is provided on the outer periphery of the cylinder (132). The side of the clamping block (102) facing the baffle (3) is an involute surface with an involute cross section, so as to adjust the tension of the pressure spring (4) by rotating the cylinder (132). Accordingly, the auxiliary spray pipe (6) includes a first pipe body (61) and a second pipe body (62) connected to each other. The first pipe body (61) is located between the cylinder (132) and the conveying pipe (5). The second pipe body (62) is slidably disposed in the conveying pipe (5). The conveying pipe (5) is provided with an arc groove (501) for the movement of the first pipe body (61), and the length of the second pipe body (62) is greater than the length of the arc groove (501).

3. The high-pressure grouting device according to claim 2, characterized in that, The locking structure includes a locking rod (103) slidably disposed on the cylinder (132) and a locking hole (104) disposed on the base (131). The locking rod (103) is connected to the cylinder (132) through a second return spring. The bottom of the locking hole (104) is provided with a magnetic attraction part, which is used to pull the locking rod (103) into the locking hole (104).

4. The high-pressure grouting device according to claim 3, characterized in that, The bottom of the cylinder (132) is provided with an inner auxiliary ring (105) and an outer auxiliary ring (106). The inner auxiliary ring (105) is fixedly connected to the cylinder (132), and the outer auxiliary ring (106) is sleeved on the outside of the inner auxiliary ring (105) and fixed on the drill bit (12). The outer auxiliary ring (106) is provided with an arc-shaped switch groove (107). The outer periphery of the grouting pipe (2) is provided with a fixing ring (8), and the locking plate (7) is fixed on the bottom surface of the fixing ring (8). The locking plate (7) extends downward and is inserted into the switch groove (107). The locking plate (7) can slide in the switch groove (107) and control the connection and separation of the locking rod (103) and the locking hole (104).

5. The high-pressure grouting device according to claim 4, characterized in that, The switch slot (107) has a first locking end and a second locking end opposite to each other, and the locking rod (103) and the locking hole (104) are disposed adjacent to the first locking end; The part of the locking plate (7) inserted into the switch slot (107) is provided with a socket (711). The inner side of the locking plate (7) is provided with a limiting plate (72). The locking plate (7) and the limiting plate (72) are detachably connected. The limiting plate (72) is provided with an outwardly protruding connecting block (721). The inner additional ring (105) is provided with an arc-shaped additional groove (108) adapted to the connecting block (721). The limiting plate (72) is provided with a retaining ring (722) and a secondary socket (723). The retaining ring (722) is used to prevent the locking rod (103) from disengaging from the locking hole (104). When the secondary socket (723) connects the locking rod (103) and the socket (711), the locking rod (103) disengages from the locking hole (104) and is inserted into the socket (711). The second locking end is provided with an outward protrusion rod (109), and the base (131) is provided with a secondary locking hole (110) located on the opposite side of the outward protrusion rod (109). When the locking plate (7) slides to the second locking end, the outward protrusion rod (109) is used to push the locking rod (103) into the secondary locking hole (110). Correspondingly, the locking plate (7) is provided with a sliding inclined surface (712) adapted to the outward protrusion rod (109) to guide the outward protrusion rod (109) to slide from the end face of the locking plate (7) to the insertion hole (711). The secondary locking hole (110) is provided with a secondary magnetic attraction part, which is used to push the locking rod (103) out from the secondary locking hole (110).

6. The high-pressure grouting device according to claim 5, characterized in that, The locking plate (7) has an inner groove (713) on the side facing the limiting plate (72), and the limiting plate (72) has an outer protrusion (724) on the side facing the locking plate (7). The outer protrusion (724) can be inserted into the inner groove (713).

7. The high-pressure grouting device according to claim 5, characterized in that, The end of the protruding rod (109) facing the switch slot (107) is constructed in an arc shape, and the end of the protruding rod (109) facing the outer auxiliary ring (106) is connected to the outer auxiliary ring (106) through a third reset spring.

8. The high-pressure grouting device according to claim 1, characterized in that, The drilling rig is connected to a feeding system that delivers cement, water, and / or air.

9. The high-pressure grouting device according to claim 8, characterized in that, When the feeding system conveys cement, it includes a mixer and a mud pump; when the feeding system conveys cement and water, it includes a mixer, a mud pump, and a clean water pump; when the feeding system conveys cement, water, and air, it includes a mixer, a mud pump, a clean water pump, and an air compressor.

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