Pressure-bearing type capsule combined anchor rod and construction method thereof

Abstract

The application provides a pressure type capsule combined anchor rod and a construction method thereof, and relates to the technical field of building equipment, which comprises a prestressed rod body and a capsule bag. Upper and lower ends of the capsule bag are respectively provided with upper and lower sealing seats, and the capsule bag, the upper sealing seat and the lower sealing seat form a capsule. A rotating pipe is rotatably arranged at a middle position inside the capsule, and fixed seats are fixedly arranged at middle positions of upper and lower ends inside the capsule. The prestressed rod body is inserted into the rotating pipe and extends out from below the rotating ring. The rotating ring is connected to the rotating pipe through a nut pipe and a joint part. After the prestressed rod body is inserted into the anchor hole to a specified position, the prestressed rod body is rotated, so that the nut pipe drives the rotating ring to rotate, the rotating ring drives the rotating pipe to rotate, the upper and lower ends of the nut pipe are reversely moved by the action of the external thread, the first supporting arm and the second supporting arm are rotated and folded, and the capsule bag is outwardly supported. The rigid support is performed before the grouting step, can lift possible obstacles, and makes subsequent capsule grouting and expansion more uniform.

Description

Technical Field

[0001] This invention relates to the field of building equipment technology, and in particular to a pressure-bearing chamber combined anchor bolt and its construction method. Background Technology

[0002] Anchoring technology has wide applications in high-rise buildings, rail transit, bridge and tunnel engineering, urban underground transportation hubs, ports and wharves, high dams, slope engineering, mining construction, and national defense engineering. The engineering community is facing numerous large-scale, technically challenging, and high-risk geotechnical engineering stability problems in projects such as tunnels, underground caverns, shaft support, slope stability, deep foundation pits, structural anti-buoyancy, and high-pressure water pipelines. Using expanded-body anchoring technology is one of the best ways to ensure the safety, economy, efficiency, and environmental friendliness of these projects. The bag-type expanded-body anchor is the most widely used in practice. In use, the bag-type expanded-body anchor is inserted into a predetermined position in the borehole, and then grouting is performed through a pre-set, separate grouting mechanism. A certain proportion of cement grout is injected into the prefabricated expansion body through a pipe. As the grout is injected, the bladder-type expansion body in the borehole gradually expands into the preset shape. At the same time, the soil and grout around the bladder are gradually compacted. With the increase of expansion pressure, the range of soil compaction zone continues to expand. The estimated influence range of the compaction zone can eventually reach twice the diameter of the bladder after expansion. After compaction, according to the correspondence principle of soil density-effective stress-shear strength, the strength of the soil around the bladder is improved. Thus, under the end-bearing effect of the expansion cement grout expansion body, the ultimate bearing capacity of a single anchor is greatly improved. Although the bladder-type expansion anchor has many advantages over traditional anchors. In the prior art, such as the authorization announcement number CN 217974355 U discloses "a multi-bag detachable pressure-bearing soil-supported anchor rod", specifically disclosing that it includes a prestressed anchor rod, a grout isolation bag, a guide cap, and the prestressed anchor rod has external threads on its outer surface. A through-tube is provided in the grout isolation bag, and the guide cap is connected to the bottom of the grout isolation bag. The prestressed anchor rod passes through the through-hole of the grout isolation bag, and its top end is threaded to the guide cap. A lower grout bag sealing frame and an upper grout bag sealing frame are fixedly connected to both ends of the grout isolation bag, and the lower and upper grout bag sealing frames are fixedly connected to a lower locking base and an upper locking base, respectively. However, in the above technology, concrete, cement mortar, cement slurry, or other curable materials are injected into the grouting pipe through a high-pressure pump, causing the grout isolation bag to expand. The bag expands by grouting, and this soft expansion can easily cause the bag portion at the obstruction point to be unable to expand when there are foreign objects inside the anchor hole, resulting in deformation. Therefore, this invention proposes a pressure-bearing bag-type combined anchor rod and its construction method to solve the problems existing in the prior art. Summary of the Invention

[0003] To address the aforementioned problems, this invention proposes a pressure-bearing bladder-type combined anchor bolt and its construction method. This pressure-bearing bladder-type combined anchor bolt and its construction method provide rigid support before the grouting step, which can lift any potential obstacles and make the subsequent bladder grouting expansion more uniform.

[0004] To achieve the objectives of this invention, the following technical solution is provided: a pressure-bearing chamber-type combined anchor bolt, comprising a prestressed rod body and a chamber bag, wherein the upper and lower ends of the chamber bag are respectively provided with an upper sealing seat and a lower sealing seat, and the chamber bag, the upper sealing seat, and the lower sealing seat form a chamber bag, a rotating tube is rotatably provided at the middle position inside the chamber bag, and a fixed seat is fixedly provided at the middle position of both the upper and lower ends inside the chamber bag, and a nut sleeve is movably provided at the upper and lower ends of the outer side of the rotating tube, and the upper and lower ends of the outer side of the rotating tube are respectively provided with external threads adapted to the two sets of nut sleeves, a first arm is hinged to the side of the fixed seat bag, a second arm is hinged to the side of the nut sleeve bag, and adjacent first and second arms are hinged together. The bottom of the lower sealing seat is provided with a rotating ring, which is connected to the rotating pipe. The prestressed rod passes through the rotating pipe and the rotating ring, and a nut tube is threaded on the lower outer side of the prestressed rod. The nut tube is linked to the rotating ring through the splicing part, and a grouting part is connected to the chamber.

[0005] A further improvement is that the splicing part includes a splicing block and a splicing groove. The splicing block is located at the top edge of the nut tube, and the splicing groove is located at the bottom edge of the rotating ring. The splicing block and the splicing groove are adapted to each other.

[0006] A further improvement is that: an outer threaded ring is provided at the bottom edge of the lower sealing seat, and a drill bit cap is threaded onto the outer threaded ring. The bottom of the drill bit cap is conical, and a filling cavity is formed between the inner side of the drill bit cap and the lower sealing seat.

[0007] A further improvement is that both ends of the lower sealing seat are provided with grout guide pipes, and the grout guide pipes connect the filling cavity and the bladder.

[0008] A further improvement is that the upper end of the rotating tube and the upper sealing seat are rotatably connected by a sealing bearing, and the lower end of the rotating tube and the lower sealing seat are rotatably connected by a sealing bearing.

[0009] A further improvement is that the grouting part includes a grouting port and an exhaust port, both of which are connected to the chamber, and the upper ends of the grouting port and the exhaust port are respectively connected to a grouting pipe and an exhaust pipe.

[0010] A further improvement is that at least three sets of first and second arms are provided between adjacent fixed seats and nut sleeves, and the three sets of first and second arms are arranged at equal included angles around the center of the nut sleeve.

[0011] A further improvement is that a flange nut is threaded onto the upper end of the prestressed rod, and a washer is provided at the lower end of the flange nut, with a spring at the lower end of the washer.

[0012] A construction method for a pressure-bearing chamber composite anchor bolt, using the aforementioned pressure-bearing chamber composite anchor bolt, includes the following steps: S1: Drill to the designed depth and carry out high-pressure jet grouting to complete the hole; S2: Combined anchor bolt, the prestressed rod is inserted into the rotating tube and extends from below the rotating ring, and the nut tube is threaded on the lower end of the prestressed rod; S3: Install the drill bit cap on the external threaded ring and use the drill bit cap to press against the lower end of the prestressed rod body, so that the splicing block of the nut tube is inserted into the splicing groove of the rotating ring; S4: Insert the anchor rod into the anchor hole. After reaching the designated position, rotate the prestressed rod body so that the nut tube rotates in a circular motion, and the circular motion drives the rotating tube to rotate. S5: Using the external thread, the upper and lower nut sleeves are driven to move in opposite directions, causing the first and second arms to rotate and fold, thus expanding the bladder outward. S6: Concrete, cement mortar, or cement grout is injected into the grouting pipe through a high-pressure pump, causing the grouting bag to expand and open into the anchor hole. Grouting is stopped when grout flows out of the exhaust pipe. S7: The prestressed bar is stressed at the upper end using the post-tensioning method, and then fixed with flange nuts after stress is applied.

[0013] A further improvement is that during the grouting process, the grout flows into the drill bit cap through the grout guide pipe, fixing the lower end of the prestressed rod.

[0014] The beneficial effects of this invention are as follows: 1. In this invention, the prestressed rod is inserted into the rotating tube and extends from below the rotating ring. The rotating ring is connected by a nut tube and splice. After being inserted into the anchor hole to the designated position, the prestressed rod can be rotated, causing the nut tube to drive the rotating ring to rotate. The rotating ring then drives the rotating tube to rotate. Using the action of the external thread, the nut sleeves at the upper and lower ends are driven to move in opposite directions, causing the first and second arms to rotate and fold, supporting the bladder outward. This rigid support is carried out before the grouting step, which can lift any obstacles that may exist, making the subsequent grouting expansion of the bladder more uniform.

[0015] 2. In the process of grouting into the bladder, the present invention supplies grout into the drill bit cap through the grout guide pipe, filling the lower end nut tube and the rotating part of the prestressed rod body, fixing the rotating structure and making the whole more stable. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention; Figure 2This is a schematic diagram of the interior of the pouch of the present invention; Figure 3 This is a schematic diagram of the structure at point A of the present invention; Figure 4 This is a schematic diagram of the nut tube of the present invention; Figure 5 This is a schematic diagram of the rotating motion of the present invention; Figure 6 This is a schematic diagram of the pipe installation according to the present invention.

[0017] The components are: 1. Prestressed rod; 2. Bag; 3. Upper sealing seat; 4. Lower sealing seat; 5. Rotary pipe; 6. Fixed seat; 7. Nut sleeve; 8. First support arm; 9. Second support arm; 10. External thread; 11. Rotary ring; 12. Nut tube; 13. Splicing block; 14. Splicing groove; 15. External thread ring; 16. Drill bit cap; 17. Grout guide pipe; 18. Sealed bearing; 19. Grouting port; 20. Vent; 21. Grouting pipe; 22. Vent pipe; 23. Flange nut; 24. Gasket; 25. Spring. Detailed Implementation

[0018] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention. Example 1

[0019] according to Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, this embodiment proposes a pressure-bearing chamber-type combined anchor bolt, including a prestressed rod body 1 and a chamber 2. The upper and lower ends of the chamber 2 are respectively provided with an upper sealing seat 3 and a lower sealing seat 4, and the chamber 2, the upper sealing seat 3, and the lower sealing seat 4 form a chamber. A rotating tube 5 is rotatably provided at the middle position inside the chamber, and a fixed seat 6 is fixedly provided at the middle position of the upper and lower ends inside the chamber. Nut sleeves 7 are movably provided at the upper and lower ends of the outer side of the rotating tube 5, and the upper and lower ends of the outer side of the rotating tube 5 are respectively provided with external threads 10 that are adapted to the two sets of nut sleeves 7. A first support arm 8 is hinged to the side of the fixed seat 6, and a second support arm 9 is hinged to the side of the nut sleeve 7. The adjacent first support arm 8 and second support arm 9 are hinged together. The bottom of the lower sealing seat 4 is provided with a rotating ring 11, which is connected to the rotating pipe 5. The prestressed rod 1 passes through the rotating pipe 5 and the rotating ring 11, and a nut tube 12 is threadedly installed on the lower outer side of the prestressed rod 1. The nut tube 12 is linked with the rotating ring 11 through the splicing part. A grouting part is connected to the chamber. In use, drill to the designed depth and carry out high-pressure jet grouting, mechanical drilling, or hole enlargement to form the hole; assemble the anchor rod, insert the prestressed rod 1 into the rotating pipe 5, extending it from below the rotating ring 11, and thread the nut tube 12 at the lower end of the prestressed rod 1; push the prestressed rod 1 upward so that the splicing block 13 of the nut tube 12 is engaged in the splicing groove 14 of the rotating ring 11; insert the anchor rod into the anchor hole, and after reaching the designated position, rotate the prestressed rod 1, so that the nut tube 12 drives the rotating ring 11 to rotate, and the rotating ring 11 drives the rotating pipe 5 to rotate; using the action of the external thread 10, drive the upper and lower nut sleeves 7 to move in opposite directions, so that the first arm 8 and the second arm 9 rotate and fold, supporting the bag 2 outward; inject concrete, cement mortar, cement slurry, or other curable materials into the grouting pipe 21 through a high-pressure pump, so that the bag 2 is grouted and expands, opening into the anchor hole.

[0020] The splicing part includes a splicing block 13 and a splicing groove 14. The splicing block 13 is located at the top edge of the nut tube 12, and the splicing groove 14 is located at the bottom edge of the rotating ring 11. The splicing block 13 and the splicing groove 14 are adapted to each other. To assemble the anchor rod, the prestressed rod body 1 is inserted into the rotating tube 5, extending from below the rotating ring 11. The nut tube 12 is threaded onto the lower end of the prestressed rod body 1. The prestressed rod body 1 is pushed upwards, causing the splicing block 13 of the nut tube 12 to engage with the splicing groove 14 of the rotating ring 11. The prestressed rod body 1 is rotated, causing the nut tube 12 to drive the rotating ring 11 to rotate, and the rotating ring 11 to drive the rotating tube 5 to rotate. Using the external thread 10, the upper and lower nut sleeves 7 are driven to move in opposite directions, causing the first arm 8 and the second arm 9 to rotate and fold.

[0021] An outer threaded ring 15 is provided at the bottom edge of the lower sealing seat 4, and a drill bit cap 16 is threaded onto the outer threaded ring 15. The bottom of the drill bit cap 16 is conical, and a filling cavity is formed between the inner side of the drill bit cap 16 and the lower sealing seat 4. The drill bit cap 16 is threaded onto the outer threaded ring 15 and is used to press against the lower end of the prestressed rod 1, so that the splicing block 13 of the nut tube 12 is inserted into the splicing groove 14 of the rotating ring 11. During the grouting process into the bag 2, grout is supplied through the grout guide pipe 17 into the filling cavity of the drill bit cap 16, filling the lower end of the nut tube 12 and the rotating ring 11 of the prestressed rod 1, and fixing the rotating structure.

[0022] Both ends of the lower sealing seat 4 are provided with grout guide pipes 17, and the grout guide pipes 17 connect the filling cavity and the bladder. During the grouting process into the bladder 2, grout is supplied through the grout guide pipes 17 into the drill bit cap 16, filling the lower end nut tube 12 and the rotating ring 11 of the prestressed rod body 1, fixing the rotating structure and making the whole more stable.

[0023] The upper end of the rotating pipe 5 and the upper sealing seat 3 are rotatably connected by a sealing bearing 18, and the lower end of the rotating pipe 5 and the lower sealing seat 4 are rotatably connected by a sealing bearing 18. The sealing bearings connect the rotating parts to prevent leakage.

[0024] The grouting section includes a grouting port 19 and an venting port 20, both of which are connected to the bladder chamber. The upper ends of the grouting port 19 and the venting port 20 are respectively connected to a grouting pipe 21 and a venting pipe 22. In use, concrete, cement mortar, cement slurry, or other curable materials are injected into the grouting pipe 21 using a high-pressure pump, causing the bladder 2 to expand and open into the anchor hole. Grouting is stopped when grout flows out of the venting pipe 22.

[0025] Three sets of first arms 8 and second arms 9 are provided between adjacent fixing seats 6 and nut sleeves 7, and the three sets of first arms 8 and second arms 9 are arranged at equal included angles around the center of the nut sleeve 7. The pouch 2 is supported outward from three points.

[0026] A flange nut 23 is threaded onto the upper end of the prestressed rod 1, and a washer 24 is provided at the lower end of the flange nut 23. A spring 25 is provided at the lower end of the washer 24. Stress is applied to the upper end of the prestressed rod 1 using the post-tensioning method, and after stress is applied, it is fixed with the flange nut 23. Example 2

[0027] according to Figure 1 , 2 As shown in Figures 3, 4, 5, and 6, this embodiment proposes a construction method for a pressure-bearing chamber combined anchor bolt. The method utilizes the aforementioned pressure-bearing chamber combined anchor bolt and includes the following steps: S1: Drill to the designed depth and carry out high-pressure jet grouting to complete the hole; S2: Combined anchor bolt, the prestressed rod body 1 is inserted into the rotating tube 5 and extends from below the rotating ring 11. The nut tube 12 is threaded on the lower end of the prestressed rod body 1. S3: Install the drill bit cap 16 on the outer threaded ring 15 and use the drill bit cap 16 to press against the lower end of the prestressed rod body 1, so that the splicing block 13 of the nut tube 12 is inserted into the splicing groove 14 of the rotating ring 11. S4: Insert the anchor rod into the anchor hole. After reaching the designated position, rotate the prestressed rod body 1 so that the nut tube 12 drives the rotating ring 11 to rotate, and the rotating ring 11 drives the rotating tube 5 to rotate. S5: Using the action of the external thread 10, the upper and lower nut sleeves 7 are driven to move in opposite directions, so that the first arm 8 and the second arm 9 rotate and fold, and the bag 2 is stretched outward. S6: Concrete or cement mortar / cement grout is injected into the grouting pipe 21 by a high-pressure pump, causing the grouting bag 2 to expand and open into the anchor hole. Grouting is stopped when grout flows out of the exhaust pipe 22. During the grouting process, the grout flows into the drill bit cap 16 through the grout guide pipe 17 to fix the lower end of the prestressed rod 1. S7: Apply stress to the upper end of the prestressed rod 1 using the post-tensioning method, and then fix it with flange nuts 23 after applying the stress.

[0028] In this invention, the prestressed rod 1 is inserted into the rotating tube 5, extending from below the rotating ring 11. The rotating ring 11 is connected to the nut tube 12 via a splicing part. After being inserted into the anchor hole to the designated position, the prestressed rod 1 can be rotated, causing the nut tube 12 to drive the rotating ring 11 to rotate, which in turn drives the rotating tube 5 to rotate. Using the external thread 10, the upper and lower nut sleeves 7 are driven to move in opposite directions, causing the first arm 8 and the second arm 9 to rotate and fold, supporting the bladder 2 outwards. This rigid support, performed before the grouting step, can lift any potential obstacles, resulting in more uniform expansion of the bladder 2 during subsequent grouting. Furthermore, during the grouting process into the bladder 2, grout is supplied through the grout guide pipe 17 into the drill bit cap 16, filling the lower end of the prestressed rod 1's nut tube 12 and the rotating ring 11, fixing the rotating structure and making the overall structure more stable.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure-bearing bladder-type composite anchor bolt, comprising a prestressed rod body (1) and a bladder (2), characterized in that: The upper and lower ends of the bag (2) are respectively provided with an upper sealing seat (3) and a lower sealing seat (4), and the bag (2), the upper sealing seat (3), and the lower sealing seat (4) form a bag chamber. A rotating tube (5) is rotatably provided at the middle position inside the bag chamber, and a fixed seat (6) is fixedly provided at the middle position of the upper and lower ends inside the bag chamber. Nut sleeves (7) are movably provided at the upper and lower ends of the outer side of the rotating tube (5), and the upper and lower ends of the outer side of the rotating tube (5) are respectively provided with external threads (10) that are compatible with the two sets of nut sleeves (7). A first support arm (8) is hinged to the side of the fixed seat (6), and a second support arm (9) is hinged to the side of the nut sleeve (7). The first support arm (8) and the second support arm (9) are hinged together. The bottom of the lower sealing seat (4) is provided with a rotating ring (11), and the rotating ring (11) is connected to the rotating pipe (5). The prestressed rod (1) passes through the rotating pipe (5) and the rotating ring (11), and a nut tube (12) is threaded on the lower outer side of the prestressed rod (1). The nut tube (12) is linked with the rotating ring (11) through a splicing part. A grouting part is connected to the chamber. The splicing part includes a splicing block (13) and a splicing groove (14). 13) The splicing groove (14) is located at the edge of the top of the nut tube (12), and the splicing block (13) is located at the edge of the bottom of the rotating ring (11). The splicing block (13) is adapted to the splicing groove (14). The lower sealing seat (4) is provided with an outer threaded ring (15) at the bottom edge, and a drill bit cap (16) is threaded on the outer threaded ring (15). The bottom of the drill bit cap (16) is conical, and a filling cavity is formed between the inner side of the drill bit cap (16) and the lower sealing seat (4). Both ends of the lower sealing seat (4) are provided with grout guide pipes (17), and the grout guide pipes (17) connect the filling cavity and the bladder.

2. The pressure-bearing chamber-type combined anchor bolt according to claim 1, characterized in that: The upper end of the rotating tube (5) and the upper sealing seat (3) are rotatably connected by a sealing bearing (18), and the lower end of the rotating tube (5) and the lower sealing seat (4) are rotatably connected by a sealing bearing (18).

3. The pressure-bearing chamber-type combined anchor bolt according to claim 2, characterized in that: The grouting section includes a grouting port (19) and an exhaust port (20). Both the grouting port (19) and the exhaust port (20) are connected to the chamber, and the upper ends of the grouting port (19) and the exhaust port (20) are respectively connected to a grouting pipe (21) and an exhaust pipe (22).

4. The pressure-bearing chamber combined anchor bolt according to claim 3, characterized in that: At least three sets of first arms (8) and second arms (9) are provided between adjacent fixed seats (6) and nut sleeves (7), and the three sets of first arms (8) and second arms (9) are arranged at equal included angles around the center of the nut sleeves (7).

5. The pressure-bearing chamber combined anchor bolt according to claim 4, characterized in that: The upper end of the prestressed rod (1) is threaded with a flange nut (23), and the lower end of the flange nut (23) is provided with a washer (24), and the lower end of the washer (24) is provided with a spring (25).

6. A construction method for a pressure-bearing chamber composite anchor bolt, using the pressure-bearing chamber composite anchor bolt described in claim 5, characterized in that, Includes the following steps: S1: Drill to the designed depth and carry out high-pressure jet grouting to complete the hole; S2: Combined anchor rod, insert the prestressed rod body (1) into the rotating tube (5), extend it from below the rotating ring (11), and thread the nut tube (12) at the lower end of the prestressed rod body (1). S3: Install the drill bit cap (16) on the outer ring (15) and use the drill bit cap (16) to press against the lower end of the prestressed rod (1), so that the splicing block (13) of the nut tube (12) is inserted into the splicing groove (14) of the rotating ring (11). S4: Insert the anchor rod into the anchor hole. After reaching the designated position, rotate the prestressed rod body (1) so that the nut tube (12) drives the rotating ring (11) to rotate, and the rotating ring (11) drives the rotating tube (5) to rotate. S5: Using the external thread (10), drive the upper and lower nut sleeves (7) to move in opposite directions, so that the first arm (8) and the second arm (9) rotate and fold, and push the bag (2) outward. S6: Concrete or cement mortar or cement slurry is injected into the grouting pipe (21) by a high-pressure pump, so that the sac (2) expands and opens into the anchor hole. When slurry flows out of the exhaust pipe (22), the grouting is stopped. S7: Apply stress to the upper end of the prestressed bar (1) using the post-tensioning method, and fix it with flange nuts (23) after applying stress.

7. The construction method of a pressure-bearing chamber combined anchor bolt according to claim 6, characterized in that: During the grouting process, the grout flows into the drill bit cap (16) through the grout pipe (17) and fixes the lower end of the prestressed rod (1).

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