Anchoring rod tensioning and locking device for deep foundation pit support

Abstract

The utility model discloses an anchor rod tensioning locking device for deep foundation pit support relates to civil engineering field, including screw steel anchor rod and the tensioning resistance nut of screwing on the outside of screw steel anchor rod front end, the outside of screw steel anchor rod front end is provided with cuboid base, the inside of cuboid base is provided with tensioning movable sleeve hole, inserts the tensioning steel cover in tensioning movable sleeve hole, and the tensioning steel cover is connected to the outside of screw steel anchor rod, cuboid base is close to rear end outside and is provided with tensioning angle adjusting device, through the tensioning angle adjusting device of detachable increase in cuboid base rear end outside, the device can be flexible adaptation pit inner wall inclination or uneven working condition, accurate regulation cuboid base and pit inner wall's contact angle, ensure that tensioning steel cover center and screw steel anchor rod center always coincide, avoid the influence tensioning stability and precision because of angle deviation, guarantee anchor rod prestress application effect.

Description

Technical Field

[0001] This utility model belongs to the technical field of civil engineering, specifically relating to an anchor bolt tensioning and locking device for deep foundation pit support. Background Technology

[0002] The anchor tensioning and locking device for deep foundation pit support is a key piece of equipment in the support system of deep foundation pit engineering. Its core function is to apply the design prestress to the threaded steel anchors in the support structure and lock them. The anchors are tensioned by hydraulic drive components, which causes the anchors to undergo elastic deformation to bear the lateral pressure of the soil on the side wall of the foundation pit. The prestress is then maintained by the locking components, which ultimately restrains the deformation of the foundation pit and prevents the slope from becoming unstable. This provides a guarantee for the safety of foundation pit excavation and construction and surrounding buildings. It is widely used in deep foundation pit support projects in the fields of construction, municipal engineering, and transportation, and is a core supporting equipment to ensure the safety of deep foundation pit construction.

[0003] However, the rectangular base of the existing anchor tensioning and locking device is mostly directly attached to the inner wall of the foundation pit for fixation. After the actual foundation pit is excavated, the wall is prone to local tilting or unevenness due to soil characteristics (such as soft soil creep and rock strata protrusion). When the base is attached to such a wall, it will tilt with the wall, causing the tensioning steel sleeve inside the base to deviate from the axis of the threaded steel anchor. When the tensioning steel sleeve is pushed forward, it will generate a lateral component force, which not only causes tension loss, but may also cause the anchor to bend and deform, making it impossible to reach the design prestress value and affecting the support effect. Utility Model Content

[0004] The purpose of this utility model is to provide an anchor bolt tensioning and locking device for deep foundation pit support, in order to solve the problem mentioned in the background art that the rectangular base of the existing anchor bolt tensioning and locking device is mostly directly fixed to the foundation pit wall. However, the foundation pit wall is prone to local tilting or unevenness due to soft soil creep, rock strata protrusion, etc., causing the base to tilt accordingly. This causes the tensioning steel sleeve to deviate from the anchor bolt axis, generating lateral force during pushing, which reduces the tension and easily bends the anchor bolt, making it difficult to achieve the design prestress and affecting the support.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a tensioning and locking device for anchor bolts used in deep foundation pit support, comprising a threaded steel anchor bolt and a tensioning blocking nut threaded onto the outside of the front end of the threaded steel anchor bolt. A cuboid base is provided on the outside of the front end of the threaded steel anchor bolt, and a tensioning movable sleeve hole is provided inside the cuboid base. A tensioning steel sleeve is inserted into the tensioning movable sleeve hole and is fitted onto the outside of the threaded steel anchor bolt. A tensioning angle adjustment device is provided on the outside of the cuboid base near the rear end.

[0006] Preferably, the tension angle adjustment device includes a U-shaped detachable flange and a metal blocking ring. The metal blocking ring is sleeved on the outer wall of the rear end of the cuboid base and is fixedly connected to the cuboid base by welding. The front end of the metal blocking ring is provided with a U-shaped detachable flange. The U-shaped opening of the U-shaped detachable flange faces downward, and the U-shaped detachable flange can be directly inserted into the outside of the cuboid base from top to bottom through the U-shaped opening.

[0007] Preferably, the tension angle adjustment device includes a metal contact plate, an internally threaded metal cylinder, an adjusting nut, and an adjusting screw. An internally threaded metal cylinder is inserted into each of the four corners of the U-shaped detachable flange, and the internally threaded metal cylinder is fixedly connected to the U-shaped detachable flange by welding. An adjusting screw is threaded into each of the internally threaded metal cylinders. An adjusting nut is welded to the front end of each of the adjusting screws, and a metal contact plate is welded to the rear end of each of the adjusting screws. All metal contact plates are located on the rear side of the U-shaped detachable flange.

[0008] Preferably, the tension angle adjustment device includes a sealing and fixing strip. The sealing and fixing strip is horizontally arranged on the outer wall of the front end near the bottom opening of the U-shaped detachable flange. Both ends of the sealing and fixing strip are fixedly connected to the U-shaped detachable flange by screws. After the U-shaped detachable flange is fully inserted into the outside of the cuboid base, the sealing and fixing strip needs to be fixed to the outer wall of the front end near the bottom opening of the U-shaped detachable flange by screws. The top of the sealing and fixing strip needs to abut against the outer wall of the bottom end of the cuboid base to prevent the U-shaped detachable flange from moving up and down.

[0009] Preferably, the tensioning steel sleeve can move back and forth in the tensioning movable sleeve hole. A metal retaining ring is welded and fixed inside the front end of the tensioning steel sleeve, and the metal retaining ring is also sleeved on the outside of the threaded steel anchor rod. The tensioning blocking nut is located at the front end of the metal retaining ring. During the forward movement of the tensioning steel sleeve, the metal retaining ring can block the tensioning blocking nut, and the threaded steel anchor rod is pulled forward by the blocking action with the tensioning blocking nut.

[0010] Preferably, the cuboid base has a nut adjustment opening at its rear end and inside the bottom end. Above the nut adjustment opening, a tension locking nut is threaded onto the external thread of the threaded steel anchor rod. After the threaded steel anchor rod is tensioned forward to a specified state, it needs to pass through the nut adjustment opening to tighten the tension locking nut. After the tension locking nut is tightened, it can lock the tension state of the threaded steel anchor rod.

[0011] Preferably, the tensioning steel sleeve has shaft fixing plates welded to the outer walls of both the left and right ends, and the cuboid base has hydraulic cylinders installed on the outer walls of both the left and right ends. The upper and lower ends of the two hydraulic cylinders are welded with thickened metal fixing strips, and the thickened metal fixing strips are fixedly connected to the cuboid base by multiple screws.

[0012] Preferably, both hydraulic cylinders are equipped with hydraulic shafts, and the front ends of the hydraulic shafts are welded with fixed flanges. The two fixed flanges are fixedly connected to the two shaft fixing plates by multiple screws. When the hydraulic cylinders push the hydraulic shafts forward, the hydraulic shafts can push and tension the steel sleeves forward through the fixed flanges and shaft fixing plates that are fixedly connected to each other.

[0013] Preferably, both hydraulic cylinders are provided with oil pipes near the top of their rear ends, and the cuboid base is fixed with an integrated seat near the top of its rear ends. Both oil pipes are connected to the integrated seat, and an external oil nozzle is provided at the center of the top of the integrated seat.

[0014] Compared with the prior art, this utility model provides an anchor bolt tensioning and locking device for deep foundation pit support, which has the following beneficial effects:

[0015] This invention adds a detachable tensioning angle adjustment device to the external rear end of a cuboid base. This device can flexibly adapt to conditions where the inner wall of the foundation pit is tilted or uneven, precisely adjusting the contact angle between the cuboid base and the inner wall of the foundation pit. This ensures that the center of the tensioning steel sleeve and the center of the threaded steel anchor rod always coincide, avoiding the impact of angle deviation on tensioning stability and accuracy, and guaranteeing the prestressing effect of the anchor rod. The tensioning angle adjustment device uses internally threaded metal cylinders at the four corners of a U-shaped detachable flange, an adjusting screw, and a metal contact plate to achieve multi-directional precise adjustment of the contact angle between the cuboid base and the inner wall of the foundation pit. When the foundation pit wall tilts, causing the base to deviate... When horizontal, the adjusting nut at the corresponding position can be rotated to drive the adjusting screw to extend and retract back and forth in the internal threaded metal cylinder, thereby pushing the metal contact plate to contact the pit wall. By adjusting the extension length of the adjusting screw at different corners, the tilt angle of the cuboid base can be gradually corrected until the center of the tensioning steel sleeve and the center of the threaded steel anchor rod are completely coincident. This multi-point adjustment method can cover the angle deviation in the front-back and left-right directions. Compared with the defects of traditional fixed structures that cannot be adjusted, it can ensure that the tensioning steel sleeve always exerts force along the anchor rod axis when it is pushed forward, avoiding the instability of tension caused by lateral component force due to angle deviation, and ensuring the accuracy of anchor rod prestress application.

[0016] The U-shaped detachable flange of the tensioning angle adjustment device adopts a detachable structure that combines top-to-bottom insertion with sealing strip fixation. It is suitable for the operation requirements of narrow working spaces in the foundation pit. During on-site installation, the rectangular base can be quickly assembled without removing it from the anchor rod. When it is necessary to adjust the angle or replace parts, the flange can be removed simply by removing the sealing strip. The operation is convenient and does not affect the overall connection between the anchor rod and the base. At the same time, the device's adjusting screw, metal contact plate, etc. are all independent structures. If a part is worn, it can be replaced individually without replacing the entire device, reducing maintenance costs. This detachable feature is highly adaptable to the on-site working conditions, solving the problems of cumbersome operation and difficult maintenance of traditional fixed adjustment structures, thereby improving construction efficiency. Attached Figure Description

[0017] Figure 1 This is a front-view three-dimensional structural diagram of the anchor bolt tensioning and locking device for deep foundation pit support according to this utility model.

[0018] Figure 2 This is a top view schematic diagram of the anchor bolt tensioning and locking device for deep foundation pit support according to this utility model.

[0019] Figure 3 This is a bottom-view three-dimensional structural diagram of the anchor bolt tensioning and locking device for deep foundation pit support of this utility model.

[0020] Figure 4 This is a three-dimensional structural diagram of the tension angle adjustment device of this utility model in use.

[0021] Figure 5 This is a three-dimensional disassembly diagram of the tension angle adjustment device of this utility model.

[0022] In the diagram: 1. Shaft fixing plate; 2. Hydraulic shaft; 3. Cuboid base; 4. Hydraulic cylinder; 5. Tensioning angle adjustment device; 6. Threaded steel anchor rod; 7. Oil pipe; 8. Integrated seat; 9. External oil nozzle; 10. Tensioning movable sleeve hole; 11. Tensioning steel sleeve; 12. Tensioning blocking nut; 14. Nut adjustment opening; 15. Tensioning locking nut; 16. Metal retaining ring; 17. Metal contact plate; 18. U-shaped detachable flange; 19. Internally threaded metal cylinder; 20. Adjusting nut; 21. Sealing fixing strip; 22. Metal blocking ring; 23. Adjusting screw. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] This utility model provides, for example Figure 1-5 The deep foundation pit support anchor tensioning and locking device shown has a cuboid base 3 as its core for load bearing and power transmission. This base serves as a fixed support frame and has a tensioning movable sleeve hole 10 inside. A tensioning steel sleeve 11, inserted into this hole, is fitted onto the outside of the threaded steel anchor rod 6. The tensioning steel sleeve 11 can slide back and forth along the tensioning movable sleeve hole 10, providing axial movement space for anchor tensioning. Shaft fixing plates 1 are welded to the left and right outer walls of the front end of the tensioning steel sleeve 11, correspondingly connected to hydraulic cylinders 4 on the left and right outer walls of the cuboid base 3. The hydraulic cylinder 4 is rigidly connected to the base via thickened metal fixing strips at both ends to ensure that the cylinder does not shift during operation. A fixed flange is welded to the front end of the hydraulic shaft 2 inside the cylinder. The fixed flange is connected to the shaft fixing plate 1 by screws, forming a power transmission chain from the hydraulic cylinder 4 to the hydraulic shaft 2 to the fixed flange to the shaft fixing plate 1 and then to the tensioning steel sleeve 11. When the external hydraulic system injects hydraulic oil through the external oil nozzle 9 of the integrated seat 8 (fixed to the top of the rear end of the base), the hydraulic oil flows through the oil pipe 7 (connecting the cylinder and the integrated seat 8). The hydraulic cylinder 4 is inserted, pushing the hydraulic shaft 2 forward, which in turn drives the tensioning sleeve 11 to slide forward along the tensioning movable sleeve hole 10. At the same time, a metal retaining ring 16 (also sleeved on the anchor rod) is welded inside the front end of the tensioning sleeve 11. The tensioning blocking nut 12, which is threaded on the front end of the threaded steel anchor rod 6, is located in front of the metal retaining ring 16. When the tensioning sleeve 11 slides forward, the metal retaining ring 16 will contact the tensioning blocking nut 12 and form a block. Since the tensioning blocking nut 12 is threadedly fixed to the anchor rod, the blocking force will be converted into an axial tension force on the anchor rod, realizing the forward tensioning of the anchor rod. This design transmits the tension force through rigid contact, avoids power loss, and ensures that the tension force is fully applied to the anchor rod. The integrated seat 8 centrally manages the two oil pipes 7, avoiding connection errors caused by messy oil pipes 7 on site. The thickened metal fixing strip is fixed with multiple screws, which can disperse the reaction force generated by the hydraulic cylinder 4 during operation, prevent local deformation of the base, ensure the stability of the hydraulic drive process, and provide continuous and uniform tension for the anchor rod tensioning.

[0025] like Figure 1 , Figure 4 and Figure 5As shown, to address the problem that tilting or unevenness of the inner walls of the foundation pit can easily lead to tilting of the cuboid base 3, resulting in angular deviation between the tensioning steel sleeve 11 and the anchor rod, a tensioning angle adjustment device 5 is installed near the rear end of the cuboid base 3. Angle correction is achieved through the coordinated operation of multiple components. The adjustment device is centered on a U-shaped detachable flange 18 with its U-shaped opening facing downwards, allowing it to be directly inserted into the outside of the cuboid base 3 from top to bottom. This open-type assembly design eliminates the need to disassemble the connection between the base and the anchor rod, adapting to the narrow working space of the foundation pit and significantly improving installation efficiency. Metal blocking rings 22 are welded to the outer walls around the rear end of the base. When the U-shaped detachable flange 18 is inserted into place, the metal blocking rings 22 can prevent the flange from sliding forward, achieving front-end positioning. A sealing and fixing strip 21 (fixed with screws) is installed horizontally on the outer wall of the front end of the flange near the bottom opening. The top of the strip abuts against the outer wall of the bottom end of the base, restricting the up-and-down movement of the flange. Together with the metal blocking rings 22, it forms a two-way fixation in the front-to-back and up-and-down directions, ensuring a stable connection between the flange and the base and providing a stable foundation for subsequent angle adjustment.

[0026] like Figure 1 , Figure 4 and Figure 5 As shown, the U-shaped detachable flange 18 has internally threaded metal cylinders 19 welded inside near its four corners. Adjusting screws 23 are threaded into the cylinders. Adjusting nuts 20 are welded to the front end of the screws, and metal contact plates 17 (located on the rear side of the flange) are welded to the rear end. When the foundation pit wall tilts, causing the foundation to tilt, the adjusting screws 23 can be moved back and forth within the internally threaded metal cylinders 19 by rotating the adjusting nuts 20. If one side of the foundation is too high, the adjusting nuts 20 at the corresponding corner can be turned to extend the adjusting screws 23 on that side backward, pushing the metal contact plates 17 against the foundation pit wall. The base is in close contact with the wall, and the reaction force of the wall is used to lift the base on that side. Conversely, if one side is too low, the adjusting nut 20 is turned to retract the screw, and the base is leveled by the support of the other corner screws. This four-point independent adjustment design can cover the angular deviations in the front-back and left-right directions until the center of the tensioning steel sleeve 11 is completely aligned with the center of the threaded steel anchor rod 6. At this time, when the tensioning steel sleeve 11 slides forward, it exerts force entirely along the axial direction of the anchor rod, avoiding the lateral component force caused by the angular deviation, which may cause the anchor rod to bend or the tensioning accuracy to decrease, and ensuring that the prestress of the anchor rod is applied accurately.

[0027] like Figure 1 , Figure 2 and Figure 3As shown, after the threaded steel anchor rod 6 is tensioned to the specified prestress value, it needs to be locked by the tension locking nut 15 to ensure that the tension is maintained for a long time. The bottom end of the rear end of the cuboid base 3 is provided with a nut adjustment opening 14. The threaded steel anchor rod 6 is threadedly fitted with a tension locking nut 15 on the outside (above the nut adjustment opening 14). Due to the existence of the nut adjustment opening 14, the operator can insert a tool (such as a wrench) through the opening to tighten the tension locking nut 15, so that the rear end of the nut fits tightly against the inner wall of the rear end of the cuboid base 3. At this time, the tension locking nut 15 is fixed to the anchor rod by the thread, and at the same time, it forms a support through contact with the base, preventing the anchor rod from rebounding backward under the prestress, thus achieving the locking of the tension state. This design ensures reliable locking through the dual constraints of thread fixing and end face support. The position of the nut adjustment opening 14 avoids the tension movable sleeve hole 10 and the hydraulic cylinder 4, which does not affect the operation of the tension structure and provides sufficient adjustment space for the operator, avoiding difficulties in locking operation due to structural obstruction.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A deep foundation pit support anchor rod tensioning and locking device, comprising a threaded steel anchor rod (6) and a tensioning and blocking nut (12) threaded and connected to the outside of the front end of the threaded steel anchor rod (6), the front end of the threaded steel anchor rod (6) is provided with a cuboid base (3), the inside of the cuboid base (3) is provided with a tensioning movable sleeve hole (10), a tensioning steel sleeve (11) is inserted into the tensioning movable sleeve hole (10), and the tensioning steel sleeve (11) is sleeved to the outside of the threaded steel anchor rod (6), characterized in that: The cuboid base (3) is provided with a tension angle adjustment device (5) near the rear external side; ​ The tension angle adjustment device (5) includes a U-shaped detachable flange (18) and a metal blocking ring (22). The metal blocking ring (22) is sleeved on the outer wall of the rear end of the cuboid base (3), and the metal blocking ring (22) is fixedly connected to the cuboid base (3) by welding. The front end of the metal blocking ring (22) is provided with a U-shaped detachable flange (18). The U-shaped opening of the U-shaped detachable flange (18) faces downward, and the U-shaped detachable flange (18) can be directly inserted into the outside of the cuboid base (3) from top to bottom through the U-shaped opening.

2. The deep foundation pit supporting anchor rod tensioning and locking device according to claim 1, characterized in that: The tension angle adjustment device (5) includes a metal contact plate (17), an internally threaded metal cylinder (19), an adjusting nut (20), and an adjusting screw (23). The U-shaped detachable flange (18) has internally threaded metal cylinders (19) inserted into its interior near the four corners. The internally threaded metal cylinders (19) are fixedly connected to the U-shaped detachable flange (18) by welding. An adjusting screw (23) is threaded into each of the internally threaded metal cylinders (19). An adjusting nut (20) is welded to the front end of each of the adjusting screws (23). A metal contact plate (17) is welded to the rear end of each of the adjusting screws (23). The metal contact plates (17) are located on the rear side of the U-shaped detachable flange (18).

3. The deep foundation pit supporting anchor rod tensioning and locking device according to claim 2, characterized in that: The tension angle adjustment device (5) includes a sealing and fixing strip (21). The U-shaped detachable flange (18) has a sealing and fixing strip (21) horizontally arranged on the outer wall of the front end near the bottom opening. Both ends of the sealing and fixing strip (21) are fixedly connected to the U-shaped detachable flange (18) by screws. After the U-shaped detachable flange (18) is fully inserted into the outside of the cuboid base (3), the sealing and fixing strip (21) needs to be fixed to the outer wall of the front end near the bottom opening of the U-shaped detachable flange (18) by screws. The top of the sealing and fixing strip (21) needs to abut against the outer wall of the bottom end of the cuboid base (3) to prevent the U-shaped detachable flange (18) from moving up and down.

4. The deep foundation pit supporting anchor rod tensioning and locking device according to claim 1, characterized in that: The tensioning sleeve (11) can move back and forth in the tensioning movable sleeve hole (10). A metal retaining ring (16) is welded and fixed inside the front end of the tensioning sleeve (11), and the metal retaining ring (16) is also sleeved on the outside of the threaded steel anchor rod (6). The tensioning blocking nut (12) is located at the front end of the metal retaining ring (16). During the forward movement of the tensioning sleeve (11), the metal retaining ring (16) can block the tensioning blocking nut (12) and pull the threaded steel anchor rod (6) forward by blocking the tensioning blocking nut (12).

5. The deep foundation pit supporting anchor rod tensioning and locking device according to claim 4, characterized in that: The cuboid base (3) rear end and inside the bottom end is provided with nut adjusting opening (14), the nut adjusting opening (14) above is provided with tension locking nut (15) on the outer thread of threaded steel anchor rod (6), the threaded steel anchor rod (6) is tensioned to the specified state, need to pass through nut adjusting opening (14) to tighten tension locking nut (15), tension locking nut (15) is tightened and can be locked to the tension state of threaded steel anchor rod (6).

6. The deep foundation pit supporting anchor rod tensioning and locking device according to claim 5, characterized in that: The front end of the tensioning steel sleeve (11) is welded with an axle fixing plate (1) on the outer wall of both ends, the cuboid base (3) is provided with a hydraulic oil cylinder (4) on the outer wall of both ends, and the upper and lower ends of the two hydraulic oil cylinders (4) are welded with thickened metal fixing strips, and the plurality of thickened metal fixing strips are fixedly connected with the cuboid base (3) through a plurality of screws.

7. The deep foundation pit supporting anchor rod tensioning and locking device according to claim 6, characterized in that: The two hydraulic oil cylinders (4) are provided with hydraulic shafts (2) inside, and the front end of the hydraulic shaft (2) is welded with a fixing flange, the two fixing flanges are fixedly connected with the two axle fixing plates (1) through a plurality of screws, and when the hydraulic oil cylinder (4) pushes the hydraulic shaft (2) forward, the hydraulic shaft (2) can push the tensioning steel sleeve (11) forward through the fixing flange and the axle fixing plate (1) fixedly connected with each other.

8. The deep foundation pit supporting anchor rod tensioning and locking device according to claim 7, characterized in that: The two hydraulic oil cylinders (4) are provided with oil pipes (7) near the top of the rear end, and the cuboid base (3) is fixedly provided with an integrated seat (8) near the top of the rear end, the two oil pipes (7) are connected with the integrated seat (8), and the integrated seat (8) is provided with an external oil nozzle (9) at the top center.

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