Foundation pit slope support fixing system and fixing method thereof

Abstract

A foundation pit slope support fixing system and a fixing method thereof, the support fixing system comprising a fixing device and a drilling device; the fixing device comprising an anchoring body and an anchor cable, wherein the anchoring body comprises a conical anchor head, one end of the anchor cable is rotationally connected with the rear side of the anchor head, the drilling device comprising a fixing frame and a guide plate on the upper side of the fixing frame, a driving box is slidably arranged on the guide plate, a hollow drill cylinder penetrating through front and back is rotationally arranged on the driving box, the front end of the drill cylinder is inserted and clampedly connected with the rear side of the anchor head, and the anchor cable is located in the drill cylinder; a jetting head is arranged on the rear side of the driving box and inserted into the drill cylinder, the anchor head and the outer ring of the drill cylinder are respectively provided with first and second spiral leaves, and when the drill cylinder is drilled, water injection work of the jetting head can directly drive the anchoring body into the interior of the slope; when the drill cylinder is withdrawn, the anchoring body can be left in the interior of the slope, and grouting work of the jetting head can complete the fixing work of the anchoring device in one drilling, thereby shortening the foundation pit support construction time and significantly improving the construction speed.

Description

Technical Field

[0001] This invention relates to the technical field of foundation pit support construction devices, specifically to a foundation pit slope support fixing system and its fixing method. Background Technology

[0002] Foundation pit support refers to the measures taken to support, reinforce, and protect the side walls and surrounding environment to ensure the safety of underground structure construction and the surrounding environment of the foundation pit. Common foundation pit support methods include anchor support, steel pile horizontal support, temporary retaining wall support, pile support, diaphragm wall and cement-soil pile wall, etc.

[0003] Regarding anchored support, the process generally includes steps such as laying the reinforcing mesh, drilling, installing anchor cables, grouting, anchoring, and shotcreting. Specifically, drilling machinery is used to pre-drill installation holes on the slope. Then, the anchor cables are inserted into the holes, leaving a free section outside. High-pressure injection of cement grout into the installation holes secures the anchor cables. Finally, the free section of the anchor cables is connected and fixed to the reinforcing mesh. Finally, cement grout is shotcreted onto the slope to complete the foundation pit support. This support method requires careful drilling, anchor cable placement, and grouting. Using different tools for each task results in a longer construction period for fixing a single anchor cable. Since the entire foundation pit support requires a large number of anchor cables for anchoring, this further extends the construction period. At the same time, this method of drilling holes first and then inserting anchor cables into the installation holes is difficult to carry out because the anchor cables themselves have poor resistance to deformation. This is especially true when soil layers restrict movement and collapse occurs in the borehole, requiring drilling again, which greatly extends the construction period of the foundation pit support anchoring. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention provides a foundation pit slope support and fixing system and its fixing method.

[0005] The technical solution of this invention is as follows:

[0006] A foundation pit slope support and fixing system includes a fixing device and a drilling device capable of driving the fixing device into the slope; wherein the fixing device includes an anchor body and an anchor cable, the anchor body includes a conical anchor head, one end of the anchor cable is connected to the rear side of the anchor head, the drilling device includes a fixing frame and a guide plate on its upper side, a guide rail is provided on the upper side of the guide plate, and a drilling jacking mechanism is slidably provided through the guide rail, the drilling jacking mechanism can drive the anchor head into the slope without first drilling holes to complete the installation of the fixing device, shortening the operation time, making the installation of the anchoring device more convenient, and significantly improving the installation efficiency of the anchoring device.

[0007] As one of the core technical concepts of this invention, the drilling mechanism includes a drive box slidably mounted on a guide rail. The drive box has rotating interfaces on both its front and rear sides along its sliding direction. The drilling mechanism also includes a cylindrical drill cylinder, the rear end of which is rotatably connected to the two rotating interfaces of the drive box and is hollow, extending through the front and rear. The drive box is also equipped with a drive motor, which is connected to the portion of the drill cylinder located inside the drive box and can drive the drill cylinder to rotate. The front end of the drill cylinder is inserted into and snapped into the rear side of the anchor head, allowing the drill cylinder and anchor head to detach independently when not tightly secured. One end of the anchor cable is rotatably connected to the rear side of the anchor head, and the other end passes through the drill cylinder. The anchor head and the outer ring of the drill cylinder are respectively provided with a first helical blade and a second helical blade. The drive motor can drive the drill cylinder to rotate, thereby driving the anchor head to rotate. Under the action of the first and second helical blades, the anchor head is driven into the slope. Because the anchor cable and anchor head are rotatably connected, the anchor cable will not coil due to the rotation of the anchor head, thus completing the installation of the anchoring device.

[0008] As another core technical concept of this invention, a spray head is fixedly installed on the rear side of the drive box near the adapter. The spray head has a hollow cavity structure, and a connecting pipe communicating with the cavity is provided on its rear side. The front side is inserted into the rear end of the drill barrel and has a first connecting port connecting the cavity and the inside of the drill barrel. A second connecting port is provided on the outer ring of the drill barrel near the anchor head. A through channel is provided in the middle of the spray head. The cavity has an annular cavity structure. The end of the anchor cable away from the anchor head passes through the drill barrel and the through channel in sequence. This allows water to be injected into the drilling end through the connecting pipe during drilling, ensuring smooth drilling. When the anchor body is driven into the preset depth, the drill barrel can be withdrawn while leaving the anchor body in the borehole. At the same time, grouting can be performed in the borehole with the help of the connecting pipe. This allows the injection of cement grout to be carried out simultaneously with the withdrawal of the drill barrel, shortening the anchoring time, increasing the convenience of anchoring, and further improving the installation efficiency of the anchoring device.

[0009] As described above, in a preferred embodiment of the foundation pit slope support and fixing system, the drilling mechanism further includes a hollow cable rod, the inner end of which passes through the through channel and the drill barrel in sequence and contacts the anchor body, while the outer end extends out of the through channel. The anchor cable passes through the cable rod. The cable rod serves two purposes: firstly, it increases the sealing of the injection head at the through channel position due to the non-circular structure of the anchor cable cross-section, preventing water or cement slurry from spraying out of the through channel position during water injection or grouting; secondly, it can tighten the anchor body during the drill barrel retraction process, allowing the anchor body to separate more smoothly from the drill barrel and remain inside the borehole.

[0010] As a further preferred embodiment, the outer end of the sling rod is provided with a fixing member that can restrict its axial rotation, so as to prevent it from affecting the drilling operation as it rotates with the drill barrel.

[0011] In the foundation pit slope support and fixing system described above, the maximum outer diameter of the second spiral blade is greater than the maximum outer diameter of the first spiral blade, so that the maximum diameter of the borehole is greater than the maximum diameter of the anchor body, thereby making the anchor body more firmly fixed in the borehole after grouting.

[0012] To facilitate smoother drilling operations, the outer ring of the second helical blade near the anchor head is a conical helical structure.

[0013] In the foundation pit slope support and fixing system described above, the anchor cable is rotatably connected to the anchor head through an axial bearing, which ensures that the anchor cable and the anchor head can smoothly generate relative rotation, while also ensuring the firmness of the connection between the anchor cable and the anchor head.

[0014] As described above, in a foundation pit slope support and fixing system, a straightening frame is provided on the upper front side of the guide plate, and a straightening opening is provided on the upper part of the straightening frame. The drill barrel passes through the straightening opening, so that the drilling direction of the drill barrel can be consistent with the sliding direction of the guide rail, thereby ensuring that the drilling work can proceed smoothly.

[0015] To adapt to drilling operations under various conditions and increase the applicability of the support and fixing system, the angle of the guide plate is adjustable.

[0016] The present invention also provides a method for fixing and supporting a foundation pit slope, which is based on the above-mentioned foundation pit slope support and fixing system, and specifically includes the following steps:

[0017] S1. Fixing of drilling equipment

[0018] According to the construction requirements, the drilling device is fixed at the position to be supported;

[0019] S2. Installation of fixing devices

[0020] S2.1 Manually insert the end of the anchor cable away from the anchor body into the front end of the drill barrel until the anchor cable passes through the drill barrel and the front end of the drill barrel is engaged with the rear side of the anchor head.

[0021] S2.2 Pass the end of the anchor cable away from the anchor body through the through channel in the middle of the injection head, and insert the front side of the injection head into the rear end of the drill barrel;

[0022] S2.3 Fix the injection head and drive box, and connect the connecting pipe to the water pipe;

[0023] S3, Drilling with a fixed device

[0024] S3.1 Start the drive motor to drive the drill barrel to rotate, which in turn drives the anchor head to rotate, and the anchor cable and drive box do not rotate relative to each other;

[0025] S3.2 The drive box slides forward along the guide rail, cooperating with the water pipe to inject water. Under the action of the first and second helical blades, the anchor body is pushed to the preset depth inside the slope, and the drive machine is turned off.

[0026] S4. Fixing of the fixing device

[0027] S4.1 The drive box slides backward along the guide rail until the drill barrel separates from the anchor head;

[0028] S4.2. Disconnect the water pipe from the connecting pipe and connect the connecting pipe to the grouting pipe;

[0029] S4.3 Start the drive motor to rotate in the reverse direction. The drive box slides backward along the guide rail. The grouting work is completed during the retraction of the drill barrel. It should be noted that the cement grout here is fine cement slurry to ensure that the grouting work can be carried out smoothly.

[0030] S4.5 After the injected cement grout has dried, connect and fix the support components to the outer end of the anchor cable to complete the slope support and fixing work.

[0031] It should be noted that in step S4.3, when the drive box slides to the point where the anchor cable is disengaged from the through channel, it stops sliding, a blockage is manually set at the outer end of the through channel, and then the grouting operation continues.

[0032] The beneficial effects of this invention are as follows:

[0033] (1) The foundation pit slope support and fixing system and fixing method of the present invention can drive the drill barrel to rotate through the drive machine, thereby driving the anchor head to rotate. Under the action of the first and second spiral blades, the anchor head is driven into the interior of the slope. Since the anchor cable and the anchor head are rotatably connected, the anchor cable will not be coiled due to the rotation of the anchor head. Finally, the installation of the anchoring device is completed. There is no need to drill holes first and then complete the installation of the fixing device, which shortens the operation time, makes the installation of the anchoring device more convenient, and significantly improves the installation efficiency of the anchoring device.

[0034] (2) The foundation pit slope support and fixing system and its fixing method of the present invention, when the drilling mechanism is drilling, water can be injected into the drilling end through the connecting pipe to ensure that the drilling work can proceed smoothly. When the anchor body is driven into the preset depth, the drill tube can be withdrawn and the anchor body can be left in the borehole. At the same time, the connecting pipe can be used to carry out grouting in the borehole, so that the cement grout injection can be carried out together with the withdrawal of the drill tube, which further shortens the operation time of fixing the anchoring device, increases the convenience of fixing the anchoring device, and improves the fixing efficiency of the anchoring device.

[0035] (3) The foundation pit slope support fixing system and fixing method of the present invention, when the drilling mechanism is drilling, can directly drive the anchor body into the slope with the water injection work of the injection head; and when the drill tube is withdrawing, the anchor body is inserted and snapped into the drill tube, so that the anchor body can remain in the slope. With the grouting work of the injection head, the fixing work of the anchor device can be completed in one drilling. Compared with the original separate operation of drilling, anchor device placement and grouting, the foundation pit support construction time is significantly shortened and the construction speed is improved. Attached Figure Description

[0036] The solutions and advantages of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention.

[0037] In the attached diagram:

[0038] Figure 1 This is a schematic diagram of the support and fixing system in the embodiment;

[0039] Figure 2 This is a side view of the support and fixation system in the embodiment;

[0040] Figure 3 This is a schematic diagram of the anchoring device in the embodiment;

[0041] Figure 4 This is a cross-sectional view of the anchoring device in the embodiment;

[0042] Figure 5 This is a schematic diagram of the drilling device in the embodiment;

[0043] Figure 6 This is a schematic diagram of the drilling mechanism in the embodiment;

[0044] Figure 7 for Figure 6 A magnified schematic diagram of the partial structure at point A in the middle;

[0045] Figure 8This is a schematic diagram of the mating structure between the drill bit and the fixing device in the embodiment;

[0046] Figure 9 This is a schematic diagram of the nozzle structure in the embodiment;

[0047] Figure 10 This is a schematic diagram of the drill bit driving method in the embodiment;

[0048] The components represented by the various reference numerals in the diagram are:

[0049] 1. Drilling device; 11. Fixing frame; 111. Connecting plate; 112. Front support; 113. Rear support; 12. Guiding mechanism; 121. Guide plate; 122. Guide rail; 123. Straightening frame; 124. Adjusting seat; 13. Drilling top mechanism; 131. Drive box; 132. Drill bit; 1321. Drill barrel; 1322. Second spiral blade; 133. Drive motor; 134. Injection head; 135. Sling rod; 2. Fixing device; 21. Anchor body; 211. Anchor head; 212. First spiral blade; 22. Anchor cable; 23. Pressure plate; 24. Axial bearing. Detailed Implementation

[0050] Exemplary embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings.

[0051] Example

[0052] This embodiment provides a foundation pit slope support and fixing system. See [link / reference] Figure 1 and Figure 2 The system includes a fixing device 2 and a drilling device 1. The drilling device 1 can directly drive the fixing device 2 into the slope during the drilling process and complete the grouting and fixing work of cement slurry in the borehole. The installation and fixing work of the anchoring device can be completed in one drilling. Compared with the work method of drilling, anchoring device installation and grouting are carried out separately, the construction time of the foundation pit support is significantly shortened and the construction speed is improved. The structure of the support fixing system (the above-mentioned foundation pit slope support fixing system) will be described in detail below.

[0053] In this embodiment, combined with Figures 3-5 The fixing device 2 includes an anchor body 21 and an anchor cable 22. The anchor body 21 includes a conical anchor head 211. One end of the anchor cable 22 is connected to the rear side of the anchor head 211. The drilling device 1 includes a fixing frame 11 and a guide plate 121 on its upper side. A guide rail 122 is provided on the upper side of the guide plate 121, and a drilling top mechanism 13 is slidably provided through the guide rail 122. The drilling top mechanism 13 can drive the anchor head 211 into the slope without drilling first, thus shortening the operation time, making the installation of the anchoring device more convenient, and significantly improving the installation efficiency of the anchoring device.

[0054] Specifically, regarding the structure of the fixing frame 11, the fixing frame 11 includes a horizontally arranged connecting plate 111. The front and rear sides of the upper end of the connecting plate 111 are provided with connecting seats, and the front support 112 and the rear support 113 are respectively connected through the connecting seats on the front and rear sides. The upper ends of the front support 112 and the rear support 113 are respectively connected to the lower sides of the front and rear ends of the guide plate 121.

[0055] To adapt to drilling operations under various conditions and increase the applicability of the support and fixing system, the angle of the guide plate 121 is adjustable. Specifically, an adjustment seat 124 is provided on the lower front side of the guide plate 121, and several adjustment seats 124 are provided on the lower rear side along its length. The lower end of the front bracket 112 is hinged to the connecting seat, and the upper end is hinged to the adjustment seat 124 on the lower front side of the guide plate 121. The lower end of the rear bracket 113 is hinged to the connecting seat. Through the hinged connection between its upper end and the different adjustment seats 124 on the lower rear side of the guide plate 121, the angle adjustment of the guide plate 121 is completed, thereby completing the drilling angle adjustment.

[0056] Regarding the structure of the drilling mechanism 13, in combination with Figure 6 It includes a drive box 131 that is slidably mounted on a guide rail 122, and a drill bit 132 is rotatably connected to the drive box 131, through which the drilling work of the anchor head 211 can be completed.

[0057] Combination Figure 10 Specifically, the drive box 131 has swivel interfaces on both its front and rear sides along its sliding direction. The drill bit 132 includes a cylindrical drill barrel 1321, the rear end of which extends into the drive box 131 through the swivel interface on the front side and is rotatably connected to the two swivel interfaces of the drive box 131, so that the drill barrel 1321 is hollow and has a through-hole shape. The drive box 131 is also provided with a drive motor 133. The drive end of the drive motor 133 extends into the drive direction and is connected to the part of the drill barrel 1321 located in the drive box 131. In this embodiment, the drive motor 133 is connected to the drill barrel 1321 through a bevel gear mechanism as an example. The drive motor 133 can drive the drill barrel 1321 to rotate, thereby sending the anchor head 211 into the slope.

[0058] Combination Figure 7 and Figure 8 In order to enable the drill barrel 1321 to smoothly drive the anchor head 211 to rotate, and at the same time, the drill barrel 1321 and the anchor head 211 can detach on their own when not tightened, that is, after the anchor head 211 is sent into the slope, the anchor head 211 can be left in the borehole when the drill barrel 1321 is withdrawn. The front end of the drill barrel 1321 is inserted and snapped into the rear side of the anchor head 211.

[0059] To prevent the anchor cable 22 from rotating in tandem with the anchor head 211, thus affecting the drilling operation, one end of the anchor cable 22 near the anchor head 211 is rotatably connected to the rear side of the anchor head 211, and the other end passes through the drill barrel 1321. Preferably, the anchor cable 22 is rotatably connected to the anchor head 211 via an axial bearing 24. Specifically, the rear side of the anchor head 211 is provided with an installation groove, and the end of the anchor cable 22 connected to the anchor head 211 is provided with an axial bearing 24. The axial bearing 24 is located in the installation groove and is pressed and fixed in the installation groove by a pressure plate 23. It should be noted that the anchor cable 22 is connected to the side of the axial bearing 24 away from the pressure plate 23, which ensures that the anchor cable 22 and the anchor head 211 can rotate smoothly relative to each other, while also ensuring the firmness of the connection between the anchor cable 22 and the anchor head 211.

[0060] To ensure the smooth progress of drilling, the anchor head 211 and the outer ring of the drill barrel 1321 are respectively provided with a first spiral blade 212 and a second spiral blade 1322. The drive motor 133 can drive the drill barrel 1321 to rotate, which in turn drives the anchor head 211 to rotate. Under the action of the first spiral blade 212 and the second spiral blade 1322, the anchor head 211 is driven into the slope. Since the anchor cable 22 is rotatably connected to the anchor head 211, the anchor cable 22 will not be tangled due to the rotation of the anchor head 211, thus completing the installation of the anchoring device.

[0061] In a preferred embodiment, the maximum outer diameter of the second spiral blade 1322 is greater than the maximum outer diameter of the first spiral blade 212, so that the maximum diameter of the borehole is greater than the maximum diameter of the anchor body 21, thereby making the anchor body 21 more firmly fixed in the borehole after grouting.

[0062] As a further preferred embodiment, the outer ring of the second spiral blade 1322 near the anchor head 211 is a conical spiral structure, which makes the drilling operation of the drill barrel 1321 smoother.

[0063] In order to ensure that the drilling direction of the drill barrel 1321 is consistent with the sliding direction of the guide rail 122, and thus ensure that the drilling work can proceed smoothly, a straightening frame 123 is provided on the upper front side of the guide plate 121. The upper part of the straightening frame 123 is provided with a circular straightening opening, through which the drill barrel 1321 passes.

[0064] In this embodiment, combined with Figure 9 The drive box 131 is also fixedly provided with an injection head 134 near the adapter on the rear side.

[0065] Specifically, the drive box 131 has a mounting platform on its rear side, and a fixing groove in the middle of the mounting platform. The adapter is located at the bottom of the fixing groove. The injection head 134 is located in the fixing groove and fixed to the mounting platform. The injection head 134 has a hollow cavity structure inside, and a connecting pipe communicating with the cavity is provided on its rear side. Its front side protrudes forward and is inserted into the rear end of the drill barrel 1321, and has a first connecting port communicating with the cavity and the inside of the drill barrel 1321. The outer ring of the drill barrel 1321 near the anchor head 211 has a second connecting port. The injection head 134 has a through channel running from front to back in its middle. The cavity is an annular cavity structure. The anchor cable... The end of the anchor 211 away from the anchor head 22 passes through the drill barrel 1321 and the through channel in sequence. This allows the drilling top mechanism 13 to inject water into the drilling end through the connecting pipe during drilling, ensuring smooth drilling. When the anchor body 21 is driven into the preset depth, the drill barrel 1321 can be withdrawn while the anchor body 21 is left in the borehole. At the same time, grouting can be carried out in the borehole with the connecting pipe. This allows the injection of cement grout to be carried out simultaneously with the withdrawal of the drill barrel 1321, shortening the anchoring time, increasing the convenience of anchoring, and further improving the installation efficiency of the anchoring device.

[0066] In a preferred embodiment, the drilling mechanism 13 further includes a hollow sling rod 135, the inner end of which passes through the through channel and the drill barrel 1321 in sequence and contacts the pressure plate 23 of the anchor body 21, while the outer end extends out of the through channel. The anchor cable 22 passes through the sling rod 135. The sling rod 135 serves two purposes: firstly, it increases the sealing of the injection head 134 at the through channel position due to the non-circular cross-section of the anchor cable 22, preventing water or cement slurry from spraying out of the through channel during water injection or grouting; secondly, it can tighten the anchor body 21 during the retraction of the drill barrel 1321, allowing the anchor body 21 to separate from the drill barrel 1321 more smoothly and remain inside the borehole.

[0067] As a further preferred embodiment, the outer end of the lasso rod 135 is provided with a fixing member that can restrict its axial rotation. The fixing member can be a handle or other structure, without further restrictions, in order to prevent it from affecting the drilling operation by rotating with the drill barrel 1321.

[0068] This embodiment also provides a method for fixing and supporting a foundation pit slope. This method is based on the aforementioned foundation pit slope support and fixing system and specifically includes the following steps:

[0069] S1, Fixing of drilling device 1

[0070] According to the construction requirements, the drilling device 1 is fixed at the position to be supported and fixed, and the tilt angle of the guide plate 121 is adjusted and fixed according to the construction requirements.

[0071] S2, Installation of fixing device 2

[0072] S2.1 Manually insert the end of the anchor cable 22 away from the anchor body 21 into the front end of the drill barrel 1321 until the anchor cable 22 passes through the drill barrel 1321 and the front end of the drill barrel 1321 is engaged with the rear side of the anchor head 211.

[0073] S2.2 Pass the end of the anchor cable 22 away from the anchor body 21 through the through channel in the middle of the injection head 134, and insert the injection head 134 into the installation groove so that the front side of the injection head 134 is inserted into the rear end of the drill barrel 1321.

[0074] S2.3. Fix the fixed injection head 134 and the drive box 131 to the mounting platform, and connect the connecting pipe to the water pipe;

[0075] S2.4. Place one end of the sling rod 135 on the outside of the end of the anchor cable 22 away from the anchor head 211, and continue to insert it into the drill barrel 1321 from the outside of the through channel until it contacts the clamping plate of the anchor body 21.

[0076] S3, Drilling of fixing device 2

[0077] S3.1 Start the drive motor 133 to drive the drill barrel 1321 to rotate, which in turn drives the anchor head 211 to rotate, and there is no relative rotation between the anchor cable 22 and the sling rod 135 and the drive box 131.

[0078] S3.2 The manual drive box 131 slides forward along the guide rail 122 and starts water injection in conjunction with the water pipe. Under the action of the first spiral blade 212 and the second spiral blade 1322, the anchor body 21 is pushed to the preset depth inside the slope. The drive motor 133 is turned off and water injection is stopped.

[0079] S4, Fixing of fixing device 2

[0080] S4.1 The manual drive box 131 slides backward along the guide rail until the drill barrel 1321 separates from the anchor head 211;

[0081] S4.2. Disconnect the water pipe from the connecting pipe and connect the connecting pipe to the grouting pipe;

[0082] S4.3 Start the drive motor 133 to rotate in the reverse direction. The drive box 131 slides backward along the guide rail. The cement grouting work is completed during the withdrawal of the drill barrel 1321. It should be noted that the cement grout here is fine cement grout to ensure that the grouting work can be carried out smoothly until the drill barrel 1321 is completely withdrawn from the total borehole and the grouting operation is stopped.

[0083] It should be noted that when the drive box 131 slides to the point where the anchor cable 22 is disengaged from the through channel, that is, when the drive box 131 slides to the point where the anchor cable 22 is away from the anchor head 211 and disengages from the through channel and enters the drill barrel 1321, the sliding stops and the grouting stops. The cable rod 135 is manually pulled out and a plug is set at the outer end of the through channel to prevent cement slurry from spraying out of the through channel. Then the barrel withdrawal and grouting operations continue to be completed.

[0084] S4.5 After the injected cement grout has dried, clean the free end of the anchor cable (the end outside the borehole) and connect and fix the support components (such as steel reinforcement mesh) to the outer end of the anchor cable 22 to complete the support and fixing work of the foundation pit slope.

Claims

1. A foundation pit slope support and fixing system, characterized in that, Includes a fixing device (2) and a drilling device (1) capable of driving the fixing device (2) into the interior of the slope; The fixing device (2) includes an anchor body (21) and an anchor cable (22), wherein the anchor body (21) includes a conical anchor head (211), and one end of the anchor cable (22) is rotatably connected to the rear side of the anchor head (211). The drilling device (1) includes a fixing frame (11) and a guide plate (121) on its upper side. A guide rail (122) is provided on the upper side of the guide plate (121), and a drilling top mechanism (13) is slidably provided through the guide rail (122). The drilling top mechanism (13) can drive the anchor head (211) into the slope. The drilling mechanism (13) includes a drive box (131) slidably mounted on a guide rail (122). The drive box (131) has a rotating interface on both the front and rear sides along its sliding direction. The drilling mechanism (13) also includes a cylindrical drill barrel (1321), the rear end of which is rotatably connected to the two rotating interfaces of the drive box (131) and is hollow with the front and rear connected. The drive box (131) is also provided with a drive motor (133). The drive motor (133) is connected to the part of the drill barrel (1321) located in the drive box (131) and can drive the drill barrel (1321) to rotate. The drive box (131) is also fixedly provided with an injection head (134) near the adapter on the rear side. The injection head (134) has a cavity structure inside, and a connecting pipe communicating with the cavity is provided on its rear side. The front side is inserted into the rear end of the drill barrel (1321), and a first connecting port communicating with the cavity and the drill barrel (1321) is provided. The front end of the drill barrel (1321) is inserted and snapped into the rear side of the anchor head (211), and a second connecting port is provided on the outer ring near the anchor head (211). The middle part of the injection head (134) is provided with a through channel that runs through the front and back. The cavity is an annular cavity structure. The end of the anchor cable (22) away from the anchor head (211) passes through the drill barrel (1321) and the through channel in sequence. When the drilling mechanism (13) is drilling, it can work with the water injection of the injection head (134) to directly drive the anchor body (21) into the slope. When the drill tube (1321) is withdrawing, the anchor body (21) can remain inside the slope. With the grouting work of the injection head (134), the anchoring device can be fixed in one drilling operation. The outer rings of the anchor head (211) and the drill barrel (1321) are respectively provided with a first spiral blade (212) and a second spiral blade (1322).

2. The foundation pit slope support and fixing system according to claim 1, characterized in that, The drilling mechanism (13) also includes a hollow sling rod (135), the inner end of which passes through the through channel and the drill barrel (1321) in sequence and contacts the anchor body (21), and the outer end extends out of the through channel; The anchor cable (22) is set through the sling rod (135).

3. The foundation pit slope support and fixing system according to claim 2, characterized in that, The outer end of the lasso rod (135) is provided with a fixing member that can restrict its axial rotation.

4. The foundation pit slope support and fixing system according to claim 1, characterized in that, The maximum outer diameter of the second spiral blade (1322) is greater than the maximum outer diameter of the first spiral blade (212).

5. The foundation pit slope support and fixing system according to claim 4, characterized in that, The outer ring of the second spiral blade (1322) near the anchor head (211) is a conical spiral structure.

6. The foundation pit slope support and fixing system according to claim 1, characterized in that, The anchor cable (22) is rotatably connected to the anchor head (211) via an axial bearing (24).

7. The foundation pit slope support and fixing system according to claim 1, characterized in that, The guide plate (121) is also provided with a straightening frame (123) on the upper front side. The straightening frame (123) is provided with a straightening opening at the upper part, and the drill barrel (1321) is set through the straightening opening.

8. The foundation pit slope support and fixing system according to claim 7, characterized in that, The angle of the guide plate (121) is adjustable.

9. A method for supporting and fixing the slope of a foundation pit, characterized in that, The foundation pit slope support and fixing system according to any one of claims 1-8, the fixing method specifically includes the following steps: S1, Fixing of drilling device (1) According to the construction requirements, the drilling device (1) is fixed at the position to be supported; S2, Installation of fixing device (2) S2.1 Manually insert the end of the anchor cable (22) away from the anchor body (21) into the front end of the drill barrel (1321) until the anchor cable (22) passes through the drill barrel (1321) and the front end of the drill barrel (1321) is engaged with the rear side of the anchor head (211); S2.2, Pass the end of the anchor cable (22) away from the anchor body (21) through the through channel in the middle of the injection head (134), and insert the front side of the injection head (134) into the rear end of the drill barrel (1321); S2.3, fix the injection head (134) and drive box (131), and connect the connecting pipe to the water pipe; S3, Drilling of the fixing device (2) S3.1 Start the drive motor (133) to drive the drill barrel (1321) to rotate, which in turn drives the anchor head (211) to rotate, and the anchor cable (22) and the drive box (131) do not rotate relative to each other; S3.2 The drive box (131) slides forward along the guide rail (122) and, in conjunction with the water injection work of the water pipe, pushes the anchor body (21) to the preset depth inside the slope under the action of the first spiral blade (212) and the second spiral blade (1322), and then shuts off the drive machine (133). S4, Fixing of fixing device (2) S4.1 The drive box (131) slides backward along the guide rail until the drill barrel (1321) separates from the anchor head (211); S4.

2. Disconnect the water pipe from the connecting pipe and connect the connecting pipe to the grouting pipe; S4.3 Start the drive motor (133) to rotate in the opposite direction, and the drive box (131) slides backward along the guide rail. The cement grouting work is completed during the process of the drill barrel (1321) retracting. S4.5 After the injected cement grout has dried, connect and fix the support components to the outer end of the anchor cable (22) to complete the slope support fixing work.

10. A method for fixing and supporting a foundation pit slope according to claim 9, characterized in that, In step S4.3, when the drive box (131) slides to the point where the anchor cable (22) is disengaged from the through channel, it stops sliding, a blockage is manually set at the outer end of the through channel, and then the grouting operation continues.

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