A device for removing existing temporary anchor bolts and cables and its application

Abstract

A device for removing existing temporary anchor bolts and cables and its application. The device includes an adjustable-angle frame base, a drill rig, a hydraulic jack, a jack base, and telescopic support legs. Four drill rig drilling guide frames are connected to the adjustable-angle frame base, and the other ends of the drill rig drilling guide frames are connected to the jack base. A drill rig guide plate is penetrated through the drill rig drilling guide frames, and the drill rig is fixed to the drill rig guide plate by bolts. The connection joint between the drill rig and the drill pipe passes through the reserved circular hole in the middle of the guide plate of the drill rig guide plate. The hydraulic jack is fixed to the jack base, and the piston end of the hydraulic jack faces the direction of the drill rig. The telescopic support legs are connected to the bottom of the jack base. The present invention combines a large-stroke hydraulic jack with a drill rig to cut between the anchor bolt / cable rod body and the anchor body, and retracts the hydraulic jack to remove the anchor bolt / cable.

Description

Technical Field

[0001] The present invention relates to the field of obstacle removal in underground and tunnel engineering, and particularly to a device for extracting existing temporary anchor bolts and anchor cables and its application. Background Art

[0002] With the increase in infrastructure scale, especially the increasing development of high-rise, super high-rise and street-level underground spaces, anchor bolts and anchor cables are often used for foundation pit support in some areas. After the completion of the project, most of these anchor bolts and anchor cables are left in the soil layer outside the foundation pit, thus affecting the subsequent construction of municipal engineering, utility tunnel engineering and subways, and becoming an obstacle to adjacent foundation pit projects under construction. For projects constructed using the mined tunneling method, such as municipal pipe jacking and subway shield tunneling, it is very difficult to deal with anchor bolts and anchor cables, which will cause the construction period to be extended and the project cost to increase significantly. For example, in the Tel Aviv Green Line project in Israel, there are numerous anchor bolt or anchor cable bodies distributed on the shield tunnel path, and these bodies that are stranded in the rock and soil layer need to be cleared before the shield tunneling of the tunnel can be carried out, otherwise the construction period will be delayed and the project cost will be greatly increased. Summary of the Invention

[0003] The present invention provides a device for extracting existing temporary anchor bolts and the process of removing anchor bolt and anchor cable obstacles encountered in the project using this device. Before the start of pipe jacking or shield tunneling, the obstacles existing on the designed tunnel path are removed to achieve the purpose of reducing project risks and improving project benefits.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A device for extracting existing temporary anchor bolts and anchor cables includes an adjustable-angle frame base, a drill, a hydraulic jack, a jack base and a telescopic support leg. Four drill guiding frames for the drill are connected to the adjustable-angle frame base, the other ends of the drill guiding frames for the drill are connected to the jack base, a drill guiding plate is penetrated through the drill guiding frames for the drill, the drill is fixed to the drill guiding plate by bolts, the connection joint between the drill and the drill rod passes through the guiding plate reserved round hole in the middle of the drill guiding plate, the hydraulic jack is fixed to the jack base, the piston end of the hydraulic jack faces the drill direction, and the telescopic support leg is connected to the bottom of the jack base.

[0006] The adjustable-angle rack base described above includes a bottom plate, a first angle-adjusting connecting plate, and a second angle-adjusting connecting plate. Expansion bolt holes are provided at the four top corners of the bottom plate. The first angle-adjusting connecting plate and the second angle-adjusting connecting plate are rotatably connected through a rotating shaft. The other ends of the two first angle-adjusting connecting plates are respectively rotatably connected to one ends of the two side plates of the bottom plate. Waist-shaped adjusting slots are provided at the other ends of the two side plates of the bottom plate. A bolt hole is provided at the other end of the second angle-adjusting connecting plate. A bolt rod is inserted through the bolt hole of the second angle-adjusting connecting plate and the waist-shaped adjusting slot, and a locking nut is connected to the bolt rod. One drill rig drilling guide frame is connected to each end of the upper surface of the two first angle-adjusting connecting plates.

[0007] A guide plate reserved round hole is provided in the middle of the drill rig guide plate described above. Guide holes are provided at the four top corners of the drill rig guide plate. The drill rig drilling guide frame is slidably connected in the guide holes. Four drill rig fixing bolt holes for connecting to the drill rig are evenly distributed between the guide plate reserved round hole and the guide holes on the drill rig guide plate.

[0008] A notch for connecting to a hydraulic jack is provided on the jack base described above.

[0009] The drill rig fixing bolt holes described above are waist-shaped holes.

[0010] The telescopic support leg described above includes a threaded rod foot supported on the ground and an outer sleeve rod threadedly sleeved on the threaded rod foot. The outer sleeve rod is connected to the bottom of the jack base.

[0011] The application of a device for removing existing temporary anchor bolts and anchor cables, and its construction steps are as follows:

[0012] S1 Locate the anchor heads of the anchor bolts and anchor cables in the basement on the inner side of the foundation pit. Through means such as checking the foundation pit support drawings, ultrasonic steel bar detection equipment, and local demolition exploration, find the accurate positions of the existing anchor heads. When there is a secondary structure design for the basement, local structure demolition is required. Chisel open part of the side wall of the basement structure, remove the anchor head and local waist beam to ensure that the drill pipe can drill normally; Consider whether to install dewatering wells according to the groundwater conditions of the site. If the groundwater level of the site is deep and the water head is below the elevation of the anchor head of the anchor bolt / anchor cable to be removed, no dewatering is required. If the groundwater level is high and above the anchor head elevation, appropriate dewatering wells need to be arranged according to the soil layer permeability coefficient to carry out dewatering to avoid groundwater flowing into the basement when the drill pipe drills and cuts the anchor solid. Install dewatering wells in the area near the outside of the foundation pit in areas with high groundwater levels to implement external dewatering of the pit;

[0013] S2 Install the extraction device. Fix the drill rig to the drill rig guide plate with bolts. The connection joint between the drill rig and the drill pipe passes through the reserved round hole in the middle of the drill rig guide plate. Fix the hydraulic jack to the jack base. Locate the anchor head position. When there is an anchor head and a waist beam, first remove the anchor head and part of the waist beam. Drill expansion bolt holes on the surface of the retaining pile / wall or the surface of the internal structural wall. Install the adjustable angle frame base on the retaining pile / wall, insert the expansion bolts, and install the whole set of extraction device.

[0014] After the extraction device is installed in S3, adjust the angle of the drill rig according to the designed inclination angle of the anchor rod and cable and the actual site conditions. After installing the drill pipe, align the drill pipe with the anchor rod and cable. After the adjustment is completed, tighten the locking nut to fasten the adjustable angle frame base, and lower the legs of the retractable support.

[0015] S4 Start the drill rig and the large-stroke hydraulic jack. Use the drill pipe to cut and separate the anchor rod and cable from the anchor body. After the drill pipe drills into the soil layer, rotate the drill rig in the reverse direction to remove the drill pipe. The hydraulic jack retracts to bring the drill rig back to its original position. Install a new section of drill pipe. The hydraulic jack pushes the drill rig forward. After connecting the newly installed drill pipe with the drill pipe that has entered the rock, the hydraulic jack continues to push the drill rig forward to continue cutting. Repeat the process until the connection range between the steel bars / strands in the anchorage section and the anchor body is reduced to the designed length.

[0016] In S5, loosen the connection bolts between the drill rig and the drill rig guide plate, remove the drill rig, then firmly connect the hydraulic jack with the rod body of the anchor rod and cable. Use the hydraulic jack to pull out the rod body of the anchor rod and cable, and cut the rod body of the anchor rod and cable in sections until the rod body of the anchor rod and cable is completely pulled out.

[0017] In S6, immediately backfill with low-strength cement slurry or cement mortar after removing the frame of the extraction device, and finally repair the damaged local basement structure wall.

[0018] In the S2 step described above, the upper and lower edges of the adjustable angle frame base are horizontal during installation.

[0019] The beneficial effects of the present invention are as follows: (1) The present invention combines a large-stroke hydraulic jack with a drill rig to cut between the rod body of the anchor rod / cable and the anchor body. After the part to be cut and separated reaches the designed length, the hydraulic jack retracts to extract the anchor rod / cable. The problem of anchor rod / cable obstacles on the tunnel design route can be completely solved by a non-excavation method, improving the safety of the tunneling equipment during shield tunneling, effectively avoiding damage to the shield by the anchor rod / cable, and also avoiding the risk of having to enter the cutter head through the manhole to remove obstacles due to entanglement of the anchor rod / cable.

[0020] (2) Seal the holes left by removing the anchor bolts / cables by injecting low-strength cement slurry or cement mortar to complete the protection of the surrounding rock and soil mass and ensure the integrity of the face soil when the shield passes through.

[0021] (3) Carry out obstacle clearing operations in the basement without affecting the traffic and facility use on the external ground surface. The influence range during the obstacle clearing process is small, which is relatively friendly to the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present invention.

[0023] Figure 2 It is a schematic structural diagram of the adjustable-angle frame base of the present invention.

[0024] Figure 3 It is a left view of the adjustable-angle frame base of the present invention.

[0025] Figure 4 It is a schematic structural diagram of the drill guide plate of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the jack base of the present invention.

[0027] Wherein: 1 - support pile / wall; 2 - free section of anchor bolt / cable; 3 - anchored section of anchor bolt / cable; 4 - rod body of anchor bolt / cable; 5 - drill pipe; 6 - expansion bolt; 7 - adjustable-angle frame base; 71 - bottom plate; 72 - first angle-adjusting connecting plate; 73 - second angle-adjusting connecting plate; 74 - kidney-shaped adjusting groove; 8 - jack base; 9 - drill; 10 - hydraulic jack; 11 - drill guiding frame for drilling; 12 - drill guide plate; 13 - telescopic support leg; 14 - expansion bolt hole; 15 - lock nut; 16 - bolt rod; 17 - reserved round hole on the guide plate; 18 - guide hole; 19 - drill fixing bolt hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] A device for removing existing temporary anchor bolts and cables includes an adjustable-angle frame base 7, a drill 9, a hydraulic jack 10, a jack base 8, and a telescopic support leg 13. Four drill guiding frames for drilling 11 are connected to the adjustable-angle frame base 7. The other end of the drill guiding frame for drilling 11 is connected to the jack base 8. A drill guide plate 12 is inserted through the drill guiding frame for drilling 11. The drill 9 is fixed to the drill guide plate 12 by bolts. The connection joint between the drill 9 and the drill pipe 5 passes through the reserved round hole 17 in the middle of the drill guide plate 12. The hydraulic jack 10 is fixed to the jack base 8. The piston end of the hydraulic jack 10 faces the direction of the drill 9. The telescopic support leg 13 is connected to the bottom of the jack base 8.

[0029] The adjustable-angle rack base 7 described above includes a bottom plate 71, a first angle-adjusting connecting plate 72, and a second angle-adjusting connecting plate 73. Expansion bolt holes 14 are provided at the four top corners of the bottom plate 71. The first angle-adjusting connecting plate 72 and the second angle-adjusting connecting plate 73 are rotationally connected through a rotating shaft. The other ends of the two first angle-adjusting connecting plates 72 are respectively rotationally connected to one ends of the two side plates of the bottom plate 71. Waist-shaped adjustment slots 74 are provided at the other ends of the two side plates of the bottom plate 71. A bolt hole is provided at the other end of the second angle-adjusting connecting plate 73. A bolt rod 16 is inserted through the bolt hole of the second angle-adjusting connecting plate 73 and the waist-shaped adjustment slot 74. A locking nut 15 is connected to the bolt rod 16. One drill rig drilling guide frame 11 is connected to each of the two ends of the upper surfaces of the two first angle-adjusting connecting plates 72.

[0030] A guide plate reserved round hole 17 is provided in the middle of the drill rig guide plate 12 described above. Guide holes 18 are provided at the four top corners of the drill rig guide plate 12. The drill rig drilling guide frame 11 is slidably connected in the guide holes 18. Four drill rig fixing bolt holes 19 connected to the drill rig 9 are evenly arranged between the guide plate reserved round hole 17 and the guide holes 18 on the drill rig guide plate 12.

[0031] A notch for connecting the hydraulic jack 10 is provided on the jack base 8 described above.

[0032] The drill rig fixing bolt hole 19 described above is a waist-shaped hole.

[0033] The telescopic support leg 13 described above includes a threaded rod foot supported on the ground and an outer sleeve rod threadedly sleeved on the threaded rod foot. The outer sleeve rod is connected to the bottom of the jack base 8.

[0034] The application of a device for removing existing temporary anchor bolts and anchor cables, and its construction steps are as follows:

[0035] S1 Locate the anchor heads of the anchor bolts and anchor cables in the basement on the inner side of the foundation pit. By means of checking the foundation pit support drawings, ultrasonic steel bar detection equipment, local excavation exploration, etc., find the accurate positions of the existing anchor heads. When there is a secondary structure design for the basement, it is necessary to carry out local structure demolition, chisel open part of the side wall of the basement structure, remove the anchor head and the local waist beam to ensure that the drill rod 5 can drill normally; Consider whether it is necessary to install dewatering wells according to the groundwater situation of the site. If the groundwater level of the site is relatively deep and the water head is below the elevation of the anchor head of the anchor bolt / anchor cable to be removed, no dewatering is required. If the groundwater level is relatively high and above the anchor head elevation, it is necessary to appropriately arrange dewatering wells for dewatering according to the soil layer permeability coefficient to avoid groundwater flowing into the basement when the drill rod drills and cuts the anchor solid. In areas with relatively high groundwater levels, dewatering wells are installed in the area near the outside of the foundation pit to implement external dewatering of the pit;

[0036] S2 Install the extraction device. Fix the drill rig 9 to the drill rig guide plate 12 with bolts. The connection joint between the drill rig 9 and the drill pipe 5 passes through the reserved round hole 17 in the middle of the drill rig guide plate 12. Fix the hydraulic jack 10 to the jack base 8. Locate the anchor head position. When there is an anchor head and a waist beam, first remove the anchor head and part of the waist beam. Drill expansion bolt holes 14 on the surface of the retaining pile / wall 1 or the surface of the internal structural wall. Install the adjustable angle frame base 7 on the retaining pile / wall 1 to ensure that the upper and lower edges of the adjustable angle frame base 7 are horizontal. The head of the drill rig 9 is basically aligned with the exposed point of the free section 2 of the anchor rod or cable. Place the expansion bolt 6 and install the whole set of extraction device;

[0037] S3 After installing the extraction device, adjust the angle of the drill rig 9 according to the designed inclination angle of the anchor rod or cable and the actual site conditions. After installing the drill pipe 5, align the drill pipe 5 with the anchor rod or cable. After the adjustment is completed, tighten the lock nut 15 to fasten the adjustable angle frame base 7, and lower the retractable support leg 13;

[0038] S4 Start the drill rig 9 and the large-stroke hydraulic jack 10. Place the first section of the external-threaded hollow drill pipe 5 into the frame and connect it to the joint of the drill rig 9. Push the large-stroke hydraulic jack 10 forward. Use the drill rig 9 to drill the drill pipe 5 into the soil layer along the inclination direction of the anchor rod or cable rod body 4. After the first section of the drill pipe 5 is drilled, use a bayonet wrench to clamp the external slot of the drill pipe 5. Rotate the drill rig 9 in the reverse direction to loosen the first section of the drill pipe 5. Retract the hydraulic jack 10. Connect the second section of the drill pipe 5 to the joint of the drill rig 9. Push the second section of the drill pipe 5 to the external-threaded part of the first section of the drill pipe 5 through the hydraulic jack 10. Drill the drill rig 9 to screw the first and second sections of the drill pipe 5 tightly. Continue to push the hydraulic jack 10 forward until the second section of the drill pipe 5 enters the soil layer. The hydraulic jack 10 continues to push the drill rig 9 forward to continue cutting. Repeat the process until the connection range between the steel bars / steel strands in the anchorage section 3 of the anchor rod or cable and the anchor body is reduced to the designed length;

[0039] S5 Loosen the connection bolts between the drill rig 9 and the drill rig guide plate 12, remove the drill rig 9, and then firmly connect the hydraulic jack 10 to the anchor rod or cable rod body 4. Retract the hydraulic jack 10 to pull out the anchor rod or cable rod body 4 with the hydraulic jack 10, and cut the anchor rod or cable rod body 4 in sections until the anchor rod or cable rod body 4 is completely pulled out;

[0040] S6 Immediately after removing the frame of the extraction device, backfill with low-strength cement slurry or cement mortar, and finally repair the damaged local basement structural wall.

[0041] The method of the present invention solves the problem of removing anchor rod and cable obstacles encountered in trenchless projects such as pipe jacking and shield tunneling. Before the start of pipe jacking or shield tunneling, the obstacles existing on the designed tunnel path are removed, so as to reduce project risks and improve project benefits. It avoids entering the cutter head through the manhole of the shield / pipe jacking machine to carry out obstacle removal operations in a confined space, reduces the downtime of the shield machine, ensures work efficiency, and thus improves the economic benefits of the project.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0043] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communicable with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The above has described the embodiments of the present invention in detail, but the content described is only the preferred embodiments of the present invention and cannot be considered as used to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still fall within the scope covered by the patent of the present invention.

Claims

1. A device for removing existing temporary anchor bolts and anchor cables, characterized in that It includes an adjustable-angle rack base (7), a drill rig (9), a hydraulic jack (10), a jack base (8), and a telescopic support leg (13). Four drill rig drilling guide frames (11) are connected to the adjustable-angle rack base (7). The other end of the drill rig drilling guide frame (11) is connected to the jack base (8). A drill rig guide plate (12) is inserted through the drill rig drilling guide frame (11). The drill rig (9) is fixed to the drill rig guide plate (12) by bolts. The connection joint between the drill rig (9) and the drill pipe (5) passes through the reserved round hole (17) in the middle of the guide plate of the drill rig guide plate (12). The hydraulic jack (10) is fixed to the jack base (8). The piston end of the hydraulic jack (10) faces the direction of the drill rig (9). The telescopic support leg (13) is connected to the bottom of the jack base (8). A reserved round hole (17) is provided in the middle of the drill rig guide plate (12). Guide holes (18) are provided at the four top corners of the drill rig guide plate (12). The drill rig drilling guide frame (11) is slidably connected in the guide holes (18). Four drill rig fixing bolt holes (19) connected to the drill rig (9) are evenly arranged between the reserved round hole (17) and the guide holes (18) on the drill rig guide plate (12).

2. The device for removing existing temporary anchor bolts and anchor cables according to claim 1, characterized in that, The adjustable-angle rack base (7) includes a bottom plate (71), a first angle-adjusting connecting plate (72), and a second angle-adjusting connecting plate (73). Expansion bolt holes (14) are provided at the four top corners of the bottom plate (71). The first angle-adjusting connecting plate (72) and the second angle-adjusting connecting plate (73) are rotationally connected by a rotating shaft. The other ends of the two first angle-adjusting connecting plates (72) are respectively rotationally connected to one ends of the two side plates of the bottom plate (71). Waist-shaped adjusting grooves (74) are provided at the other ends of the two side plates of the bottom plate (71). A bolt hole is provided at the other end of the second angle-adjusting connecting plate (73). A bolt rod (16) is inserted through the bolt hole and the waist-shaped adjusting groove (74) of the second angle-adjusting connecting plate (73). A locking nut (15) is connected to the bolt rod (16). One drill rig drilling guide frame (11) is connected to each end of the upper surface of the two first angle-adjusting connecting plates (72).

3. The device for removing existing temporary anchor bolts and anchor cables according to claim 1, characterized in that, A notch for connecting the hydraulic jack (10) is provided on the jack base (8).

4. The device for removing existing temporary anchor bolts and anchor cables according to claim 1, wherein The drill rig fixing bolt holes (19) are waist-shaped holes.

5. The device for removing existing temporary anchor bolts and anchor cables according to claim 1, characterized in that, The telescopic support leg (13) includes a threaded rod foot supported on the ground and an outer sleeve rod threadedly sleeved on the threaded rod foot. The outer sleeve rod is connected to the bottom of the jack base (8).

6. Application of a device for removing existing temporary anchor bolts and cables, using the device for removing existing temporary anchor bolts and cables as described in claim 1, characterized in that, Its construction steps are as follows: S1 Locate the anchor heads of the anchor bolts and anchor cables in the basement on the inner side of the foundation pit, chisel a part of the side wall of the basement structure, remove the anchor heads and local waist beams; in areas with a relatively high groundwater level, drill precipitation wells in the area near the outer side of the foundation pit and implement external pit dewatering; S2 Install the extraction device. Fix the drill rig (9) to the drill rig guide plate (12) with bolts. The connection joint between the drill rig (9) and the drill pipe (5) passes through the reserved circular hole (17) in the middle of the drill rig guide plate (12). Fix the hydraulic jack (10) to the jack base (8). Locate the anchor head position. When there are anchor heads and waist beams, first remove the anchor heads and part of the waist beams. Drill expansion bolt holes (14) on the surface of the retaining pile / wall (1) or the surface of the internal structural wall. Install the adjustable angle rack base (7) on the retaining pile / wall (1), insert the expansion bolts (6), and install the whole set of extraction devices. S3 After installing the extraction device, adjust the angle of the drill rig (9) according to the designed inclination angle of the anchor rod and cable and the actual site conditions. After installing the drill pipe (5), align the drill pipe (5) with the anchor rod and cable. After the adjustment is completed, tighten the locking nut (15) to fasten the adjustable angle rack base (7), and lower the telescopic support legs (13). S4 Start the drill rig (9) and the large-stroke hydraulic jack (10). Use the drill pipe (5) to cut and separate the free section (2) of the anchor rod and cable from the anchored section (3) of the anchor rod and cable. After the drill pipe (5) drills into the soil layer, rotate the drill rig (9) in the reverse direction to remove the drill pipe (5). The hydraulic jack (10) retracts to bring the drill rig (9) back to its original position. Install a new section of drill pipe (5). The hydraulic jack (10) pushes the drill rig (9) forward. After connecting the newly installed drill pipe (5) with the drill pipe (5) that has entered the rock with the drill rig (9), the hydraulic jack (10) continues to push the drill rig (9) forward to continue cutting. Repeat the process until the connection range between the steel bars / strands in the anchored section (3) and the anchor body is reduced to the designed length. S5 Loosen the connection bolts between the drill rig (9) and the drill rig guide plate (12), remove the drill rig (9), then firmly connect the hydraulic jack (10) with the anchor rod and cable body (4). Use the hydraulic jack (10) to pull out the anchor rod and cable body (4) and cut the anchor rod and cable body (4) in sections until the anchor rod and cable body (4) is completely pulled out. S6 Immediately backfill with low-strength cement slurry or cement mortar after removing the rack of the extraction device, and finally repair the damaged local basement structure wall.

7. The application of the device for removing existing temporary anchor bolts and anchor cables according to claim 6, characterized in that, In the S2 step described above, the upper and lower edges of the adjustable angle rack base (7) are horizontal during installation.

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