Internal and external pressurizing anchoring type anti-floating anchor rod device and construction method thereof

Abstract

The internal and external pressurizing anchoring type anti-floating anchor rod device comprises an internal pressurizing device, an external pressurizing device and an anchoring device, the internal pressurizing device comprises an internal grouting pipe, an anchor rod, anchoring seats, internal grouting equipment and an internal pressurizing bag, and the anchoring seats and pressurizing holes are arranged on the internal grouting pipe at intervals in the length direction of the internal grouting pipe; the inner pressurizing bag is sleeved on the inner grouting pipe; the outer pressurizing device comprises an outer grouting pipe and outer grouting equipment, the anchoring device comprises a fixed seat, a movable seat, an anchor plate, a driving rod and a driving block, the fixed seat is fixed to the inner grouting pipe and located between the anchoring seat and the inner pressurizing bag, a sliding groove is formed in the anchoring seat, and the movable seat is slidably sleeved with the sliding groove; the two ends of the driving rod are hinged between the driving base and the fixing base, and when the inner pressurizing bag expands, the driving rod can be extruded outwards to be unfolded. By means of a linkage mechanism of the inner pressurizing bag and the anchoring device, the position of the anchor rod can be dynamically adjusted, and it is ensured that the uplift bearing capacity is stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to an internal and external pressure boosting anchoring type anti-floating anchor rod device and a construction method thereof. BACKGROUND

[0002] As the core measure of underground engineering anti-floating, the anti-floating anchor rod is anchored to the building bottom plate at one end and to the ground bearing stratum at the other end, and uses the friction between the anchoring steel bar, the grouting body and the surrounding soil layer to offset the groundwater buoyancy, and is widely used in basement, underground complex and other engineering. Its stress mechanism is completely opposite to that of foundation pile - bearing tension instead of pressure, so the requirements for anchoring stability and grouting density are more stringent, and the performance is directly affected by the change of groundwater level.

[0003] The existing anti-floating anchor rod relies on spot welding to fix the anchor rod and the positioning rib, and the connection strength is weak and easy to fall off; during the lowering process, there is a lack of dynamic adjustment mechanism, and it is easy to deviate from the anchor hole center line due to the influence of drilling verticality deviation, uneven pore wall friction and other factors. The spacing between the deviated anchor rod and the anchor hole wall is uneven, which not only leads to too large difference in mortar thickness during subsequent grouting, but also makes the actual stress point of the anchor rod deviate from the design position, greatly reducing the stability of the anti-pulling bearing capacity.

[0004] The current grouting method mainly uses bottom return grouting or lifting grouting pipe, which belongs to single-point grouting mode. Due to the self-weight effect of the slurry, the bottom slurry is easy to form a dense area due to pressure concentration, while the middle and upper parts are easy to have cavities and segregation due to pressure decay; if high pressure water head stratum is encountered, groundwater erosion will further aggravate the imbalance of slurry distribution. This defect of dense bottom and loose upper part makes the friction between the anchor rod and the soil layer unable to be evenly transmitted, which becomes a potential hidden danger of anti-floating failure.

[0005] At the same time, the existing anti-floating anchor rod structure is affected by anchor rod deviation, uneven grouting pressure distribution and local collapse of hole wall, so that the mortar is difficult to completely fill the gap between the anchor hole wall and the anchor rod. Especially in the drilling expansion section, rock fracture and other parts, blind areas are easy to form; if high permeability stratum is encountered, the slurry may also cause the hole to return to the slurry in advance due to rapid leakage. The incomplete grouting body cannot effectively wrap the anchor rod, directly weakening the friction transmission effect, and easily becoming a channel for groundwater erosion of the anchoring body.

[0006] Therefore, it is necessary to study an internal and external pressure boosting anchoring type anti-floating anchor rod device and a construction method thereof. SUMMARY

[0007] In view of this, the purpose of the present application is to provide an internal and external pressurization anchoring type anti-floating anchor rod device and its construction method, aiming at the existing anti-floating anchor rod relying on spot welding fixation and lacking dynamic adjustment mechanism during lowering, easy to deviate from the anchor hole center line, resulting in uneven thickness of the mortar, stability of the anti-floating bearing capacity is reduced; the grouting is in single point mode, affected by the self weight of the slurry and the high pressure water head stratum groundwater scouring, the slurry distribution is unbalanced, forming the defect of lower density and upper loose; affected by the anchor rod deviation, uneven grouting pressure and hole wall collapse, the mortar is difficult to completely fill the gap between the anchor hole wall and the anchor rod, easy to form the unfilled blind area, the present application realizes the dynamic calibration of the anchor rod position through the internal pressurization device, combines the internal and external double pressurization system bidirectional grouting pressure, at the same time, with the help of the mechanical linkage of the anchoring device, the stability of the anchor rod and the anchor hole wall is strengthened, effectively solving the problems of poor stability and weak grouting strength of the existing anti-floating anchor rod.

[0008] To achieve the above purpose, the technical scheme adopted by the present application is: an internal and external pressurization anchoring type anti-floating anchor rod device, comprising an internal pressurization device, an external pressurization device and an anchoring device; the internal pressurization device comprises an internal grouting pipe, an anchor rod, an anchoring seat, an internal grouting equipment and an internal pressurization bag; the internal grouting pipe is hollow inside, and a sealing seat is arranged on the upper end portion thereof; the internal grouting equipment is in communication with the inside of the internal grouting pipe through the sealing seat; the anchoring seat and a pressurization hole are arranged on the internal grouting pipe along the length direction thereof; the internal pressurization bag is sleeved on the internal grouting pipe, and the inside thereof is in communication with the pressurization hole; and the anchor rod is fixed on the anchoring seat; The external pressurization device comprises an external grouting pipe and an external grouting equipment, and the external grouting pipe is outside and connected with the external grouting equipment; The anchoring device comprises a fixed seat, a moving seat, an anchor plate, a driving rod and a driving block; the fixed seat is fixed on the internal grouting pipe and located between the anchoring seat and the internal pressurization bag; a sliding groove is arranged on the anchoring seat; the moving seat is slidably sleeved in the sliding groove; the driving block is arranged on the moving seat; the driving block is provided with a vertical slot; the driving seat is slidably sleeved in the vertical slot; and the two ends of the driving rod are hinged between the driving seat and the fixed seat; when the internal pressurization bag expands, the driving rod can be expanded outward.

[0009] Further, the internal pressurization bag has a structure of small at both ends and large in the middle, or the internal pressurization bag has a structure of small at the upper part and large at the lower part.

[0010] Further, the fixed seat and the anchoring seat are respectively provided with an upper clamping seat and a lower clamping seat; the internal pressurization bag is sleeved on the upper clamping seat and the lower clamping seat and is sealingly fixed by a hoop.

[0011] Further, the internal pressurization bag comprises a unit bag body, a grouting head and a clamping plate; a plurality of groups of positioning columns are uniformly arranged on the outer wall of the internal pressurization pipe, so as to form a plurality of clamping areas outside the internal pressurization pipe; the unit bag body is adaptively clamped in the clamping area and is fixed with the clamping plate on both sides thereof; and the clamping plate is fixed on the positioning column.

[0012] Further, the middle part of the anchor seat is provided with a center hole, and the outer side is uniformly arranged with limiting grooves and sliding grooves alternately.

[0013] Further, the two sides of the limiting groove are provided with round holes, the anchor rod is clamped into the limiting groove from the outside, the limiting seat is clamped into the limiting groove from the outside, and the limiting seat is fixed on the anchor seat by applying a bolt in the round hole.

[0014] Further, the upper part and the lower part of the anchor seat are provided with booster holes, and corresponding inner booster bags and anchor devices are arranged on the outer side of the corresponding booster holes.

[0015] Further, the upper part of the anchor rod, the inner grouting pipe and the outer grouting pipe is fixed on the bracket, the upper end of the anchor rod is bent, and hoop is arranged at the outer end of the anchor rod.

[0016] Further, the end of the inner grouting pipe and the outer grouting pipe is connected with a three-way valve through a pipeline and a pressure gauge, the three-way valve is communicated with a grouting device, and a pressure regulating valve and a vacuum device are further arranged on the inner grouting pipe.

[0017] An internal and external booster anchoring type anti-floating anchor rod construction method is applied to the internal and external booster anchoring type anti-floating anchor rod device, and is characterized by comprising the following steps. Step one, site cleaning The construction site is cleaned, then the position is located and the line is drawn according to the construction drawing, the hole position is determined, the hole is drilled to the specified depth by the drilling machine, and the hole wall is cleaned by the air compressor. Step two, lowering the anti-floating anchor rod Step three, adjusting the internal pressure The vacuum device and the pressure regulating valve are connected to the inner grouting pipe, the internal pressure of the inner grouting pipe is adjusted, the inner booster bag is inflated, the anchor device is driven to move outward synchronously, the external position of the anti-floating anchor rod is adjusted, then the position of the anti-floating anchor rod on the bracket is stabilized, then the internal pressure of the inner grouting pipe is adjusted again, and part or all of the inner booster bag is retracted. Step four, external grouting The anchor hole is grouted from bottom to top through the outer grouting pipe, and after the grout fills the anchor hole, the upper part of the anchor hole is filled with gravel to seal and maintain pressure. Step five, secondary pressure boosting Sand mortar is injected into the inner grouting pipe through the grouting device, the inner booster bag is inflated, the sand mortar in the anchor hole is subjected to secondary pressure boosting, and pressure maintaining is performed. Step five, secondary pressure boosting Sand mortar is injected into the inner grouting pipe through the grouting device, the inner booster bag is inflated, the sand mortar in the anchor hole is subjected to secondary pressure boosting, and pressure maintaining is performed. Step six, pressure compensation The inner grouting pipe is subjected to secondary pressure compensation and pressure maintaining.

[0018] The beneficial effects of the above technical solution are: the present application aims at the pain points of traditional anti-floating anchor in positioning accuracy, grouting density, anchoring stability and the like, and through the linkage mechanism of the internal pressure boosting device and the anchoring device and the internal and external double pressure boosting grouting process, the all-around improvement of the anti-floating performance is realized.

[0019] When the internal pressure boosting bag expands, the moving seat and the anchor plate are pushed outward by the driving rod, so that the position of the anchor rod in the anchor hole can be calibrated in real time, and deviation caused by drilling perpendicularity deviation and uneven hole wall friction force can be avoided. This mechanism fundamentally solves the problems of uneven mortar thickness and deviation of stress point from the designed position after the traditional anchor rod deviates, ensures uniform transmission of uplift capacity, and significantly improves the stability of bearing capacity.

[0020] The present application relies on the linkage mechanism of the internal pressure boosting bag and the anchoring device, and can dynamically adjust the position of the anchor rod, thereby fundamentally avoiding the problem of uneven mortar thickness caused by deviation, and significantly improving the stability of uplift bearing capacity; the anchor rod and the anchoring seat are fixed by bolts, instead of traditional spot welding, so that the connection strength is greatly improved, and the hidden danger of falling is effectively solved. In terms of grouting quality, the present application adopts a two-stage mode of external filling and internal pressure boosting secondary extrusion: after the external grouting pipe completes preliminary filling, the internal pressure boosting bag forms radial pressure through secondary expansion, completely eliminates the defect of single-point grouting with lower density and upper looseness, and ensures that the mortar fully fills the anchor hole gap and blind area. In use, the retracted state of the internal pressure boosting bag can reduce the outer diameter of the device, facilitating safe lowering of the anchor rod; the anchor plate spikes penetrate into the hole wall after grouting, and cooperates with the gripping action of the mortar to synergistically enhance the overall anchoring effect. In addition, the internal pressure boosting bag is made of high-strength impermeable material, and is matched with pressure regulating equipment to realize accurate pressure control, effectively resist underground water erosion, and ensure long-term use reliability. In summary, the present application relies on the linkage mechanism of the internal pressure boosting bag and the anchoring device, and can dynamically adjust the position of the anchor rod, thereby fundamentally avoiding the problem of uneven mortar thickness caused by deviation, ensuring the stability of uplift bearing capacity, solving the problems of positioning deviation, uneven grouting and weak connection of traditional anti-floating anchor, and providing an efficient and stable technical solution for underground engineering anti-floating. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is an implementation structure schematic diagram of the present application; Figure 2 It is a front view structure schematic diagram of the present application; Figure 1 Figure 3 It is a sectional view of A-A in the present application; Figure 2 Figure 4 It is a construction structure schematic diagram of the present application; ​​Figure 5 Fig. 1 is a schematic diagram of a top view structure of the present application; Figure 6 Fig. 2 is a schematic diagram of an embodiment structure of the internal pressurization bag; Figure 7 Fig. 3 is a schematic diagram of another embodiment structure of the internal pressurization bag; Figure 8 Fig. 4 is a schematic diagram of a double pressurization anchoring structure; Figure 9 Fig. 5 is a schematic diagram of an embodiment structure of the anchoring seat.

[0022] Reference signs: 1 - internal grouting pipe, 2 - anchor rod, 3 - anchoring seat, 31 - central hole, 32 - sliding groove, 33 - limiting groove, 34 - round hole, 35 - limiting seat, 4 - end head, 5 - stirrup, 6 - pressurization hole, 7 - fixing seat, 8 - internal pressurization bag, 81 - unit bag body, 82 - positioning column, 83 - clamping plate, 84 - grouting head; 9 - connecting block, 10 - moving seat, 11 - driving block, 12 - vertical groove, 13 - driving rod, 14 - anchor plate, 15 - sharp, 16 - anchor hole, 17 - external grouting pipe, 18 - sealing seat, 19 - bracket, 20 - three-way valve, 21 - grouting equipment, 22 - pressure regulating valve. DETAILED DESCRIPTION

[0023] The present application will be further described in detail below in combination with the accompanying drawings and specific embodiments: Embodiment 1, the present embodiment aims to provide an internal and external pressurization anchoring type anti-floating anchor rod device and its construction method, mainly used for anti-floating anchor rod construction. The existing anti-floating anchor rod relies on spot welding fixation for positioning and has no dynamic adjustment mechanism for lowering, which is easy to deviate from the center line of the anchor hole, resulting in uneven thickness of the mortar, and the stability of the uplift bearing capacity is reduced. For grouting, the single-point grouting mode is affected by the self-weight of the slurry and the high-pressure water head stratum groundwater scouring, and the slurry distribution is unbalanced, forming the defect of lower density and upper loose. At the same time, affected by the anchor rod deviation, uneven grouting pressure and hole wall collapse, the mortar is difficult to completely fill the gap between the anchor hole wall and the anchor rod, and it is easy to form an unfilled blind area, which weakens the friction force transmission effect and may also become a groundwater erosion channel. Based on this, the present embodiment provides an internal and external pressurization anchoring type anti-floating anchor rod device and its construction method.

[0024] As shown in Figure 1 An internal and external pressurization anchoring type anti-floating anchor rod device, which comprises an internal pressurization device, an external pressurization device and an anchoring device. In view of the problems of the existing anti-floating anchor rod positioning deviation, uneven grouting and unsaturated mortar filling, the present embodiment takes dynamic positioning adjustment and internal and external double pressurization grouting as the basic concept, realizes dynamic calibration of the anchor rod position through the internal pressurization device, and combines the internal and external double pressurization systems to grout and apply pressure from the inside and outside of the anchor hole, solving the problems of lower density and upper loose caused by single-point grouting and filling blind area. At the same time, through the mechanical linkage structure of the anchoring device, the stability of the anchor rod and the anchor hole wall is strengthened, and the uplift bearing capacity is improved.

[0025] In this embodiment, the internal pressure boosting device is used to apply pressure to the middle part of the anchor hole. In terms of structure, the internal pressure boosting device comprises an internal grouting pipe 1, an anchor rod 2, an anchor seat 3, an internal grouting device, and an internal pressure boosting bag 8. The internal grouting pipe 1 is hollow inside, and a sealing seat is arranged on the upper end of the internal grouting pipe 1. The internal grouting pipe 1 can be a circular pipe structure with an upper opening. The internal grouting device is in communication with the inside of the internal grouting pipe 1 through the sealing seat. The sealing seat ensures that the end is closed, so that the inside can be adjusted in pressure by external equipment.

[0026] The anchor seat 3 and the pressure boosting hole 6 are arranged at intervals along the length direction of the internal grouting pipe 1. The internal pressure boosting bag 8 is sleeved on the internal grouting pipe 1, and the inside of the internal pressure boosting bag 8 is in communication with the pressure boosting hole 6. The anchor rod 2 is fixed on the anchor seat 3. The middle part of the anchor seat 3 is provided with a circular central hole 31. A plurality of anchor seats 3 are successively sleeved on the internal grouting pipe 1 from one end of the internal grouting pipe 1, and the positions are adjusted. Then, the anchor seats 3 are fixed on the internal grouting pipe 1 in a welded manner, and a mounting and fixing base is formed.

[0027] The outer side of the anchor seat 3 is uniformly and alternately arranged with a limiting groove 33 and a sliding groove 32. The limiting groove 33 and the sliding groove 32 are both open structures. The anchor rod 2 is loaded into the limiting groove 33 from the outside and is fixed therein. Specifically, a round hole 34 can be arranged on both sides of the limiting groove 33. The anchor rod 2 is clamped into the limiting groove 33 from the outside. A limiting seat 35 is adaptively clamped into the outside of the limiting groove 33 from the outside, and the limiting seat 35 is fixed on the anchor seat 3 by applying a bolt in the round hole 34, or the limiting seat 35 can be fixed by binding with a wire in the round hole 34. Thus, the inner side of the anchor rod 2 is limited by the anchor seat 3, and the outer side is fixed by the limiting seat 35 or the wire, so that the anchor rod 2 is stably fixed on the anchor seat 3.

[0028] In implementation, three anchor rods 2 are arranged at intervals around the internal grouting pipe 1 and are limited by the anchor rod seats. In order to further ensure the stability of the anchor rod 2, hoop reinforcements 5 are arranged at intervals on the outer ends of the anchor rods 2, and the arrangement positions of the hoop reinforcements 5 are arranged at intervals with the positions of the anchor seats 3, so as to enhance the external limitation of the anchor rod 2 and ensure the stability of the anchor rod 2.

[0029] The external pressure boosting device comprises an external grouting pipe 17 and an external grouting device. The external grouting pipe 17 is outside and is connected with the external grouting device. In specific implementation, the external grouting device can be independently arranged with the internal grouting device and is arranged with a corresponding power pump. The mortar is injected into the anchor hole from the outside.

[0030] The anchoring device comprises a fixed seat 7, a moving seat 10, an anchor plate 14, a driving rod 13 and a driving block 11. The fixed seat 7 is fixed on the inner grouting pipe 1 and is between the anchoring seat 3 and the inner pressure bag 8, so that when the inner pressure bag 8 expands, the force can be transmitted to the driving rod 13 to make the driving rod 13 swing. Specifically, the inner pressure bag 8 is in the area surrounded by the driving rod 13 and is assembled on the inner grouting pipe 1.

[0031] In the embodiment, the anchoring seat 3 is provided with a sliding groove 32, the moving seat 10 is slidingly sleeved in the sliding groove 32, the driving block 11 is arranged on the moving seat 10, the driving block 11 is provided with a vertical groove 12, a driving seat is slidingly sleeved in the vertical groove 12, and the two ends of the driving rod 13 are hinged between the driving seat and the fixed seat 7. When the inner pressure bag 8 expands, the driving rod 13 can be expanded outwardly, and when the inner pressure bag 8 contracts, the driving rod 13 can be automatically pulled back. In the embodiment, the driving rod 13 can swing around the hinge point with the expansion or contraction of the inner pressure bag 8, and then the moving seat 10 moves in the sliding groove 32 through the limiting and supporting of the vertical groove, and then the anchor plate 14 at the end of the moving seat 10 approaches the inner wall of the anchor hole.

[0032] In the specific implementation, the inner pressure bag 8 has a structure of small ends and large middle part. In the installation, the fixed seat 7 and the anchoring seat 3 are respectively provided with upper and lower clamping seats, the inner pressure bag 8 is sleeved on the upper and lower clamping seats and is sealed and fixed by a hoop. In the structure, the middle part of the inner pressure bag 8 expands more greatly, can better apply force to the driving rod 13 from the middle part, has a large force arm, ensures the swing power source of the driving rod 13 and enables the moving seat 10 to move smoothly.

[0033] In the construction, the upper parts of the anchor rod 2, the inner grouting pipe 1 and the outer grouting pipe 17 are fixed on the bracket, the upper end of the anchor rod 2 is bent, and the floating anchor rod 2 is supported and stabilized from the upper part by the bracket.

[0034] The embodiment also provides a construction method of the inner and outer pressure anchoring type anti-floating anchor rod 2, which is applied to the inner and outer pressure anchoring type anti-floating anchor rod 2 device and has the characteristics that the method comprises the following steps. Step one, site cleaning The construction site is cleaned, then the position is positioned and the line is drawn according to the construction drawing, the hole position is determined, the hole is drilled to the specified depth by a drilling machine, and the hole wall is cleaned by an air compressor.

[0035] Step two, lowering the anti-floating anchor rod 2 The anti-floating anchor rod 2 is hoisted and inserted into the anchor hole 16 from top to bottom, the outer grouting pipe 17 is lowered into the anchor hole 16, and the upper parts of the anti-floating anchor rod 2 and the outer grouting pipe 17 are preliminarily supported on the bracket.

[0036] ​Step three, adjust the internal pressure The vacuum device and pressure regulating valve are connected to the internal grouting pipe 1, and the internal pressure of the internal grouting pipe 1 is adjusted to make the internal pressure bag expand and drive the anchoring device to move outward synchronously, adjust the external placement of the anti-floating anchor rod 2, and then stabilize the position of the anti-floating anchor rod 2 on the bracket 19, and then adjust the internal pressure of the internal grouting pipe 1 again to make part or all of the internal pressure bag retract.

[0037] The internal grouting pipe 1 is the core support, which fixes the anchoring seat 3 and the internal pressure bag 8 along the length direction, and the internal grouting device injects slurry into the internal pressure bag through the internal grouting pipe 1 to make it expand; the expanded internal pressure bag extrudes the driving rod 13 of the anchoring device, drives the moving seat 10 to slide along the sliding groove 32, and finally makes the anchor plate 14 close to the wall of the anchor hole 16, realizing dynamic calibration of the position of the anchor rod 2.

[0038] Step four, external grouting The anchor hole 16 is grouted from bottom to top through the external grouting pipe 17, and after the slurry fills the anchor hole 16, the upper part of the anchor hole 16 is filled with gravel to seal and maintain pressure; the external grouting pipe 17 is independent of the internal grouting pipe 1, and the external grouting device injects mortar into the gap between the anchor hole 16 and the internal device to fill the space of the anchor hole 16 from the outside.

[0039] Step five, secondary pressure boosting The mortar is injected into the internal grouting pipe 1 through the grouting device, and the internal pressure bag is expanded to make the mortar in the anchor hole 16 undergo secondary pressure boosting and pressure maintenance. Step six, pressure supplementing The internal grouting pipe 1 is subjected to secondary pressure supplementing and pressure maintenance.

[0040] In the specific implementation, the internal pressure bag 8 is connected to the driving rod 13 through the connecting block 9, and in this embodiment, the internal pressure bag 8 is used as the main power adjustment basis, which has three action states. The first state is the retraction state, in which the internal pressure bag 8 is retracted and close to the internal grouting pipe 1, the driving rod 13 is in the folded state, and under the linkage action, the moving seat 10 is in the inward position and the anchor plate 14 is in the inward position. In this state, the anti-floating anchor rod 2 is lowered into the anchor hole 16, and then the pressure of the internal grouting pipe 1 is adjusted to make the internal pressure bag 8 expand and make the driving rod 13 swing outward, and then the moving plate and the anchor plate 14 move to the side and close to the side wall of the anchor hole 16 to adjust the position of the anti-floating anchor rod 2. When the adjustment is in place, the mortar is injected into the anchor hole 16 through the external grouting pipe 17 to fill the space in the anchor hole 16, and after the filling is completed; in the third state, the pressure of the internal grouting pipe 1 is further adjusted to make the internal pressure bag 8 further expand to form secondary pressure inside, ensuring that the mortar fills the gaps inside the anchor hole 16, and at the same time, the driving rod 13 swings to make the anchor plate 14 further move to the inner wall, and at the same time, the sharp spikes on the outer surface of the anchor plate 14 further penetrate into the inner wall of the anchor hole 16 to improve the overall stability.

[0041] In the pressure regulating stage, the retraction pressure regulation utilizes vacuum pumping to retract the internal pressure boosting bag 8, and the subsequent expansion is performed by internally injecting mortar. According to the amount of injected mortar, the internal pressure boosting bag 8 is further expanded. In practice, the internal pressure boosting bag 8 can be supported by a high-strength impermeable geomembrane to ensure its durability.

[0042] The embodiment provides an internal and external pressure boosting anchoring type anti-floating anchor rod 2 device and construction method, which takes dynamic positioning and double pressure boosting grouting as core ideas, and effectively solves the pain points of traditional anti-floating anchor rods 2. On the structure, through the high-strength connecting block and the double-fixed anchoring seat 3, the precise positioning of the anchor rod 2 is realized by cooperating with the sliding groove 32 guide and pressure monitoring, and the anchor plate 14 sharp spike and mortar grip cooperate to improve the uplift stability; the double-stage mode of external filling and internal pressure boosting secondary extrusion is adopted during grouting, and the impermeable material and water stop measures are matched to eliminate grouting unevenness and cavities, and adapt to complex strata; the retraction state is convenient for safe lowering during construction, special stratum treatment measures reduce environmental impact, and the material durability and quality control mechanism guarantee long-term reliability, thereby providing an efficient solution for underground engineering anti-floating.

[0043] Embodiment 2, the structure of the internal pressure boosting bag 8 is further described.

[0044] In the embodiment, the internal pressure boosting bag 8 has a structure of small upper part and large lower part. Through this structure, the small upper part and large lower part conical structure can drive the driving rod 13. In the unfolded state, the structure can effectively fit the driving rod 13 main body, has a certain adaptability with the swing direction of the driving rod 13, has the characteristics of multi-point support, and ensures the effective driving of the driving rod 13.

[0045] Embodiment 3, the structure of the grouting equipment is further described.

[0046] In the embodiment, the end of the internal grouting pipe 1 and the external grouting pipe 17 is connected with a three-way valve 20 through a pipeline and a pressure gauge, the three-way valve 20 communicates with the grouting equipment 21, and a pressure regulating valve 22 and a vacuum equipment are further arranged on the internal grouting pipe 1.

[0047] In the embodiment, the internal pressure of the internal grouting pipe 1 is adjusted by the vacuum equipment in advance, so that the internal pressure boosting bag 8 is in a retracted state, and the whole device is in a retracted state. Then, the port is closed by a valve. Then, the anti-floating anchor rod 2 is lowered into the anchor hole 16. When grouting is needed, the pressure regulating valve 22 is opened, then the slurry is injected, so that the internal pressure boosting bag 8 expands, and the internal and external grouting pipes 17 are connected by the three-way valve, which simplifies the equipment structure and is designed for the grouting process of the embodiment.

[0048] Embodiment 4, the specific structure and installation position of the internal pressure boosting bag 8 are further described. The inner pressure boosting bag 8 in the embodiment comprises a unit bag body 81, a grouting head 84 and a clamping plate 83. The outer wall of the inner pressure boosting pipe is uniformly provided with a plurality of groups of positioning columns 82, thereby forming a plurality of clamping areas outside the inner pressure boosting pipe. The unit bag body 81 is clamped in the clamping area and is fixed with clamping plates on both sides, and the clamping plates are fixed on the positioning columns.

[0049] The embodiment adopts a combined bag body structure and is installed outside the inner grouting pipe 1 by means of combination and assembly. Each unit bag body 81 corresponds to the corresponding driving rod 13, and the unit bag body 81 is communicated in the inner grouting pipe 1, the internal pressure is the same, the unit bag body 81 expands and shrinks uniformly, the overall structure is convenient to install and assemble, and it is not necessary to use the end to be sleeved, thereby facilitating construction operation.

[0050] In the embodiment 5, upper and lower pressure boosting structures are configured.

[0051] The upper part and the lower part of the anchoring seat 3 are provided with pressure boosting holes 6, and corresponding inner pressure boosting bags and anchoring devices are arranged outside the corresponding pressure boosting holes 6.

[0052] Through the structure, the inner pressure boosting bag 8 can be configured from top to bottom, and the upper and lower driving rods 13 are simultaneously driven to swing and jointly act on the moving seat 10, so that the anchoring plate 14 is provided with more powerful acting force, the device can move in the environment full of mortar, and the structure can smoothly and effectively move.

[0053] The above-described embodiments of the application do not constitute a limitation on the protection scope of the application. The basic concept of the application is to dynamically adjust the position of the anchor rod by means of the linkage mechanism of the inner pressure boosting bag and the anchoring device, thereby fundamentally avoiding the uneven thickness of the mortar caused by deviation and ensuring the stability of the uplift bearing capacity. Any modification, equivalent replacement and improvement within the spirit and principles of the application shall be included in the protection scope of the claims of the application.

Claims

1. An internally and externally pressurized anchoring anti-buoyancy anchor device, characterized in that: The system includes an internal pressurization device, an external pressurization device, and an anchoring device. The internal pressurization device includes an internal grouting pipe, an anchor rod, an anchoring seat, an internal grouting device, and an internal pressurization bag. The internal grouting pipe is hollow inside, with a sealing seat at its upper end. The internal grouting device communicates with the inside of the internal grouting pipe through the sealing seat. Anchoring seats and pressurization holes are arranged at intervals along the length of the internal grouting pipe. The internal pressurization bag is fitted onto the internal grouting pipe and communicates with the pressurization holes. The anchor rod is fixed to the anchoring seat. The external pressurization device includes an external grouting pipe and an external grouting device. The external grouting pipe is located on the outside and connected to the external grouting device. The anchoring device includes a fixed seat, a movable seat, an anchor plate, a drive rod, and a drive block. The fixed seat is fixed on the inner grouting pipe and is located between the anchoring seat and the inner pressure bag. A sliding groove is provided on the anchoring seat, and the movable seat is slidably fitted in the sliding groove. A drive block is provided on the movable seat, and the drive block is provided with a vertical groove. The drive seat is slidably fitted in the vertical groove. The two ends of the drive rod are hinged between the drive seat and the fixed seat. When the inner pressure bag expands, it can push the drive rod outward to unfold.

2. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 1, characterized in that: The inner pressure bag has a structure that is small at both ends and large in the middle, or the inner pressure bag has a structure that is small at the top and large at the bottom.

3. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 2, characterized in that: The fixed seat and the anchor seat are respectively provided with an upper card seat and a lower card seat, and the internal pressure bag is fitted on the upper card seat and the lower card seat and sealed and fixed by a hoop.

4. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 2, characterized in that: The internal pressurization bag includes a unit bag body, an injection head, and a clamping plate. Multiple sets of positioning posts are evenly arranged on the outer wall of the internal pressurization pipe, thereby forming multiple clamping areas on the outside of the internal pressurization pipe. The unit bag body is fitted with a clamping sleeve in the clamping area, and clamping plates are fixed on both sides of it. The clamping plates are fixed on the positioning posts.

5. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 1, characterized in that: The anchor seat has a central hole in the middle, and a limiting groove and a sliding groove are evenly and alternately arranged on its outer side. Both the limiting groove and the sliding groove are open structures.

6. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 5, characterized in that: The limiting groove has round holes on both sides. The anchor rod is inserted into the limiting groove from the outside, and the limiting seat is inserted into the outside of the limiting groove from the outside. The limiting seat is fixed to the anchor seat by applying bolts in the round holes.

7. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 1, characterized in that: The anchor seat is provided with pressure-increasing holes at both the upper and lower parts, and corresponding internal pressure-increasing bags and anchoring devices are provided on the outside of the corresponding pressure-increasing holes.

8. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 1, characterized in that: The upper parts of the anchor rod, inner grouting pipe and outer grouting pipe are all fixed on the bracket. The upper end of the anchor rod is bent, and stirrups are provided at intervals at the outer end of the anchor rod.

9. The internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to claim 1, characterized in that: The ends of the inner and outer grouting pipes are connected to a three-way valve via a pipe and a pressure gauge. The three-way valve is connected to the grouting equipment. A pressure regulating valve and a vacuum device are also installed on the inner grouting pipe.

10. A construction method for an internally and externally pressurized anchoring anti-buoyancy anchor bolt, applied to the internally and externally pressurized anchoring anti-buoyancy anchor bolt device according to any one of claims 1-9, characterized in that: Includes the following steps: Step 1: Site Cleanup The construction site was cleaned, and then the location of the holes was determined by marking lines according to the construction drawings. The holes were then drilled to the specified depth using a drilling rig. The hole is then cleaned to a certain depth using an air compressor. Step 2: Lower the anti-buoyancy anchor bolts; Lift the anti-buoyancy anchor rod and insert it into the anchor hole from top to bottom. Lower the external grouting pipe into the anchor hole and initially support the upper part of the anti-buoyancy anchor rod and the external grouting pipe on the bracket. Step 3, Adjust the internal pressure Connect the vacuum equipment and pressure regulating valve to the inner grouting pipe, and adjust the internal pressure of the inner grouting pipe to expand the inner pressure bag and drive the anchoring device to move outward synchronously. Adjust the external position of the anti-buoyancy anchor rod, then stabilize the position of the anti-buoyancy anchor rod on the bracket, and then adjust the internal pressure of the inner grouting pipe again to make part or all of the inner pressure bag retract. Step 4, External Grouting Grouting is performed on the anchor hole from bottom to top through the external grouting pipe. After the grout fills the anchor hole, the upper part of the anchor hole is filled with crushed stone to seal and maintain pressure. Step 5, Secondary pressurization Grout is injected into the inner grouting pipe through grouting equipment, and the inner pressure bag is expanded to pressurize the grout in the anchor hole a second time and maintain the pressure. Step 6, pressurize Secondary pressurization is performed on the internal grouting pipe, and the pressure is maintained.

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