Drilling, expanding and grouting integrated bag type anchor rod structure
Through the integrated bladder anchor structure of drilling, expansion, hole formation and grouting, integrated construction of drilling, hole expansion, hole formation and grouting is achieved, which solves the problems of easy collapse of the hole wall and poor grouting controllability after ordinary anchor cables are formed, ensures construction quality and improves the pull-up bearing capacity of the anchor.
Patent Information
- Application Number
- CN202421420738.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-06-20
AI Technical Summary
When constructing in sensitive formations with high groundwater levels, the hole walls are prone to collapse after ordinary anchor cables become holes, the anchor cables cannot be lowered, and the grouting controllability is poor, making it difficult to achieve the designed pull-up bearing capacity, and the construction quality is difficult to ensure.
The integrated bladder type anchor structure of drilling and expansion grouting is adopted. The high-pressure jet rotary jet drill bit is inserted into the steel pipe and penetrates the bottom steel plate. The rotary jet drill bit bearing is used to lower the anchor rod to promote the integrated construction of drilling, hole expansion, hole formation and grouting. The grouting bag is tied to the end of the anchor rod, so that an enlarged cement solid body is formed after grouting the end of the anchor rod.
Effectively control the water and sand gushing during hole formation, grouting and pulling out casing, ensure the construction quality of the anchor cable, reduce the pressure of the rotary spray grouting body in the anchor section, and suppress the local crushing and shear damage of the rotary spray body under high tension load conditions.
Smart Images
Figure CN222797531U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of anchor rods, in particular to a drilling, expansion and grouting integrated capsule type anchor rod structure. Background Art
[0002] When constructing in sensitive strata such as silty clay, silt or fine sand with high groundwater levels, problems such as water gushing and mud (sand) gushing are often encountered. When ordinary anchor cables are used for support, the hole wall is prone to collapse after drilling, the anchor cables cannot be lowered and the grouting controllability is poor. The designed pull-out bearing capacity is often not achieved, and the construction quality is difficult to guarantee.
[0003] In view of this, we propose an integrated drilling, expansion and grouting bladder anchor structure, which is mainly an integral structure formed by welding steel pipe one, steel pipe two, top steel plate and bottom steel plate. It is intended to insert the high-pressure jet drill rod into the steel pipe one, pass through the lower bottom steel plate, and use the high-pressure jet drill bit bearing to lower and push the installed anchor rod as a whole, so as to achieve integrated construction of drilling, expansion, hole forming and grouting. In order to enhance the bearing capacity of the anchor rod, the end of the integrated drilling, expansion and grouting bladder anchor rod is tied with a grouting bag, so that an enlarged cement entity is formed after grouting at the end of the anchor rod, thereby solving the above-mentioned problems. Utility Model Content
[0004] The purpose of the utility model is to provide an integrated capsule anchor structure of drilling, expansion and grouting, which can avoid the situation in which the hole wall is easy to collapse after the hole is formed when ordinary anchor cables are used for support, the anchor cables cannot be lowered and the grouting controllability is poor, the designed pull-out bearing capacity is often not achieved, and the construction quality is difficult to guarantee.
[0005] The utility model provides an integrated drilling, expansion and grouting bag-type anchor rod structure, comprising a top steel plate and a bottom steel plate, wherein the top steel plate and the bottom steel plate are both provided with a middle hole at their centers, a steel pipe one is welded between the two middle holes, an anchor rod with a rotary jet drill bit is penetrated through the steel pipe one, the rotary jet drill bit penetrates the bottom steel plate and extends to the outside, a grouting bag is fixed on the anchor rod, a grouting pipe is connected to the grouting bag, reserved holes one are symmetrically formed on the top steel plate and the bottom steel plate with the middle hole as the center, a steel pipe two is welded between two groups of the reserved holes one, a steel strand is installed in the steel pipe two, the bottom of the steel strand is fixed by an extrusion anchor, and the diameter of the reserved hole one is larger than the size of the steel strand.
[0006] Preferably, the grouting pipe passes through the reserved hole 2 opened on the top steel plate and extends into the grouting bag, and a one-way check valve is installed at the bottom of the grouting pipe.
[0007] Preferably, a plugging head is sleeved on the upper end of the grouting pipe, and a plurality of elastic plates are arranged on the lower end of the plugging head.
[0008] Preferably, a mounting piece is provided on the lower side of the plugging head, and suction cups are slidably provided on both sides of the mounting piece.
[0009] Preferably, the top steel plate and the bottom steel plate are both annular steel plates with a diameter of 160 mm and a thickness of 20 mm.
[0010] Preferably, the diameter of the grouting bag after grouting is 550-650 mm.
[0011] Preferably, the grouting bag is made of Viron waterproof canvas.
[0012] The embodiment of the utility model provides a drilling, expansion and grouting integrated capsule anchor structure, compared with the prior art:
[0013] The utility model mainly comprises an integral structure formed by welding a steel pipe 1, a steel pipe 2, a top steel plate and a bottom steel plate, and is intended to insert a high-pressure jetting rotary jet drill bit into the interior of the steel pipe 1 and pass through the bottom steel plate, and utilize the rotary jetting drill bit bearing to push the installed anchor rod as a whole downward, so as to achieve integrated construction of drilling, hole expansion, hole forming and grouting. In order to enhance the bearing capacity of the anchor rod, a grouting bag is tied to the end of the anchor rod, so that an enlarged cement solid body is formed after grouting the end of the anchor rod, and integrated construction of drilling, rotary jetting and grouting is formed through the above construction process, and the gushing of water and sand in the process of hole forming, grouting and pulling out the casing is effectively controlled, so as to ensure the construction quality of the anchor cable, and the bag is utilized to expand the bearing area of the solid body, so as to greatly reduce the pressure of the rotary jetting grouting body in the anchoring section, and can effectively suppress the local crushing and shear failure of the rotary jetting body under high tension load conditions. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the following is a brief introduction to the drawings required for use in the implementation mode. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.
[0015] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the utility model in use state;
[0016] Figure 2 It is a three-dimensional schematic diagram of the overall structure of an embodiment of the utility model;
[0017] Figure 3 It is a schematic diagram of the overall structure of an embodiment of the utility model;
[0018] Figure 4 This is a schematic diagram of the structure of the top steel plate and the bottom steel plate of an embodiment of the utility model;
[0019] Figure 5 This is a schematic diagram of the top view of the bottom steel plate of an embodiment of the utility model;
[0020] Figure 6 The figure is a schematic diagram of the plugging head structure of an embodiment of the utility model.
[0021] Reference numerals:
[0022] 1. Top steel plate; 2. Bottom steel plate; 3. Middle hole; 4. Reserved hole one; 5. Reserved hole two; 6. Steel pipe one; 7. Steel pipe two; 8. Jet-jet drill bit; 9. Steel strand; 10. Extrusion anchor; 11. Grouting bag; 12. Grouting pipe; 13. Sealing head; 14. Elastic plate; 15. Mounting parts; 16. Suction cup; 17. One-way check valve. DETAILED DESCRIPTION
[0023] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.
[0024] Please refer to Figure 1-Figure 6 The embodiment of the utility model provides an integrated drilling, expansion and grouting bag-type anchor structure, including a top steel plate 1 and a bottom steel plate 2. A middle hole 3 is opened at the center of the top steel plate 1 and the bottom steel plate 2. The diameter of the middle hole 3 is 89 mm. A steel pipe 6 is welded between the two middle holes 3. At the same time, reserved holes 4 are symmetrically opened on the top steel plate 1 and the bottom steel plate 2 with the middle hole 3 as the center. A steel pipe 2 7 is welded between the two groups of reserved holes 4. Therefore, the structure formed by welding the top steel plate 1, the bottom steel plate 2 and the steel pipes 1 6 and 2 7 is an integral bearing body.
[0025] Among them, the top steel plate 1 and the bottom steel plate 2 are both annular steel plates with a diameter of 160mm and a thickness of 20mm. Steel pipe 1 6 and steel pipe 2 7 are DN50 steel pipes with a length of 1-4m. According to the design value, it is finally determined to adopt the circular welding method to weld them on the top steel plate 1 and the bottom steel plate 2. Before welding, it should be ensured that the steel plate and the steel pipe are vertical and there is no tilt; after welding, the inner wall of the inner ring of the bottom steel plate 2 is tapped.
[0026] At the same time, reserved holes 1 4 and 2 5 are opened on the top steel plate 1 and the bottom steel plate 2, and a grouting bag 11 is fixed on the anchor rod. The grouting bag 11 forms a closed space between the carriers. The length of the grouting bag 11 is determined according to the distance between the top steel plate 1 and the bottom steel plate 2. The diameter of the grouting bag 11 after grouting is preferably 550-650mm. The grouting bag 11 is made of high-strength Viron waterproof canvas. The quality of the Viron waterproof canvas should meet the requirements of relevant specifications, and its pressure bearing strength shall not be lower than 2.0Mpa.
[0027] A grouting pipe 12 is connected to the grouting bag 11, and the grouting pipe 12 extends into the grouting bag 11 through the reserved hole 25, and is used for grouting the grouting bag 11. A temporary plugging head 13 is arranged on the top of the grouting pipe 12 to prevent foreign matter from entering and blocking the grouting pipe 12, and a one-way check valve 17 is installed at the bottom of the grouting pipe 12 to prevent the high-pressure cement slurry from flowing back.
[0028] A plurality of elastic plates 14 are provided at the lower end of the plugging head 13, which tightly wrap the outer wall of the grouting pipe 12 to improve the stability of the installation of the plugging head 13. At the same time, a mounting member 15 is provided on the lower side of the plugging head 13, and suction cups 16 are slidably provided on both sides of the mounting member 15. The suction cups 16 are adsorbed on the outer side of the grouting pipe 12 to further improve the plugging effect.
[0029] An anchor rod with a jet-jet drill bit 8 is passed through the steel pipe 1 6 , and the jet-jet drill bit 8 passes through the bottom steel plate 2 and extends to the outside. At the same time, the prepared steel strand 9 passes through the steel pipe 2 7 and is installed on the carrier, and the steel strand 9 is fixed by an extrusion anchor 10 .
[0030] The diameter of the reserved hole 4 is larger than the size of the steel strand 9. For example, the opening size of the reserved hole 4 of the commonly used 15.2 steel strand 9 should be 18 mm, and a DN15 steel pipe should be used for assembly and welding; the opening size of the reserved hole 4 of the 21.6 steel strand 9 should be 25 mm, and a DN20 steel pipe should be used for assembly and welding.
[0031] The carrier and the drill rod are effectively connected by threads. Therefore, during the drilling process, the drilling rig uses high-pressure mud to cut the soil. After drilling to the designed depth of the anchoring section, the drilling rig slows down and increases the pressure to perform cement slurry rotary spraying to expand the hole. After drilling to the designed depth, the grouting bag 11 is started to be grouted, and the drill rod is reversed to separate from the carrier. When the drill rod is pulled out, grouting is simultaneously performed to the surrounding soil.
[0032] In summary, the drilling, expansion and grouting integrated bag anchor structure of the embodiment of the utility model has the following working principle: a steel pipe 1 6, a steel pipe 2 7, a top steel plate 1 and a bottom steel plate 2 are welded to form a carrier, a high-pressure jetting rotary jet drill bit 8 is inserted into the steel pipe 1 6, and passes through the bottom steel plate 2, and the bearing of the rotary jetting drill bit 8 is used to lower and push the installed anchor as a whole, so as to achieve the integrated construction of drilling, expanding, forming holes and grouting. In order to strengthen the bearing capacity of the anchor, a grouting bag 11 is tied to the end of the anchor, and the carrier is effectively connected to the drill rod by a thread. Therefore, during the drilling process, the drilling rig uses high-pressure mud to cut the soil, slows down the speed after drilling to the designed depth of the anchoring section, increases the pressure to perform cement slurry rotary jet expansion, and after drilling to the designed depth, starts grouting the grouting bag 11 through the grouting pipe 12, and reverses to separate the drill rod from the carrier. When the drill rod is pulled out, grouting is simultaneously added to the surrounding soil, so that an enlarged cement entity is formed after grouting the end of the anchor.
[0033] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A drilling, expansion and grouting integrated capsule anchor structure, comprising a top steel plate (1) and a bottom steel plate (2), characterized in that: The top steel plate (1) and the bottom steel plate (2) are both provided with a central hole (3) at their centers. A steel pipe (6) is welded between the two central holes (3). An anchor rod with a jet grouting drill head (8) is passed through the steel pipe (6). The jet grouting drill head (8) passes through the bottom steel plate (2) and extends to the outside. A grouting bag (11) is fixed to the anchor rod. A grouting pipe (12) is connected to the grouting bag (11). Pre-reserved holes (4) are symmetrically provided on the top steel plate (1) and the bottom steel plate (2) with the central hole (3) as the center. A steel pipe (7) is welded between the two groups of the pre-reserved holes (4). A steel strand (9) is installed in the steel pipe (7). The bottom of the steel strand (9) is fixed by an extrusion anchor (10). The diameter of the pre-reserved hole (4) is larger than the size of the steel strand (9).
2. The drilling, expansion and grouting integrated capsule anchor structure according to claim 1, characterized in that: The grouting pipe (12) passes through the reserved hole 2 (5) opened on the top steel plate (1) and extends into the grouting bag (11). A one-way check valve (17) is installed at the bottom of the grouting pipe (12).
3. The drilling, expansion and grouting integrated capsule anchor structure according to claim 2 is characterized in that: The upper end of the grouting pipe (12) is sleeved with a plugging head (13), and the lower end of the plugging head (13) is provided with a plurality of elastic plates (14).
4. The drilling, expansion and grouting integrated capsule anchor structure according to claim 3 is characterized in that: A mounting member (15) is provided at the lower side of the plugging head (13), and suction cups (16) are slidably provided on both sides of the mounting member (15).
5. The drilling, expansion and grouting integrated capsule anchor structure according to claim 1, characterized in that: The top steel plate (1) and the bottom steel plate (2) are both annular steel plates with a diameter of 160 mm and a thickness of 20 mm.
6. The drilling, expansion and grouting integrated capsule anchor structure according to claim 5, characterized in that: The diameter of the grouting bag (11) after grouting is 550-650 mm.
7. The drilling, expansion and grouting integrated capsule anchor structure according to claim 6, characterized in that: The grouting bag (11) is made of Velen waterproof canvas.