A hydraulic expansion anchor with a brace arm

Abstract

The application discloses a support arm type hydraulic expansion anchor rod, which comprises a support arm, a hydraulic cylinder, a tension bar, soil extruding steel sheets, an anchor device, an anchoring plate and a fixed hinge support, the two ends of the support arm are hingedly connected with the two soil extruding steel sheets through the fixed hinge supports, the piston rod end of the hydraulic cylinder is hingedly connected with the support arm, the cylinder body bottom is hingedly connected with the soil extruding steel sheets through the fixed hinge support, one end of the tension bar is connected with the anchoring plate through the anchor device, and the other end of the tension bar is connected with the support arm. The support arm type hydraulic expansion anchor rod can make the expansion part of the anchor rod have a larger expansion range and have a larger soil extruding pressure on the soil body, can fully play the role of the hydraulic cylinder, and can significantly improve the anchoring force of the anchor rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of foundation pit support, in particular to a bracing arm type hydraulic expansion anchor rod. BACKGROUND

[0002] Anchor rod support is a reinforcing support method used in surface engineering such as slope, rock-soil deep foundation pit, and underground chamber construction such as tunnel and stope. A rod column made of metal, wood, polymer or other materials is punched into a pre-drilled hole in the surface rock mass or chamber surrounding rock mass, and the head, rod body and tail plate of the rod column are specially manufactured to rely on the adhesion effect to combine the surrounding rock and stable rock mass together to produce a suspension effect, a composite beam effect and a reinforcement effect to achieve the purpose of support.

[0003] The existing anchor rod grouting construction can only form anchoring force after the grouting construction is completed and the grouting stone body reaches a certain strength, which causes slow construction progress. The existing hydraulic expansion anchor rod cannot uniformly provide force to the surrounding, and the recovery process is difficult to recover if it is stuck. The Chinese utility model patent "Hydraulic expansion anchor rod" (application number 201420863583.6) discloses that the upper end of the telescopic support is connected with an annular support plate, and the lower end is connected with an oil pipe. The oil pipe passes through the rod body to connect a hydraulic box, and the hydraulic box is connected with the tail end of the anchor rod. The anchor rod is deeply punched into the hole, the telescopic support is controlled by the hydraulic box to support the annular support plate, and the soft pad of the annular support plate is deeply punched into the rock layer groove. After the support is completed, it can be recovered. However, the length of the hydraulic system is long, and the pressure is completely provided by the hydraulic rods on both sides. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a bracing arm type hydraulic expansion anchor rod. The bracing arm of the present application is a structural member with high bending strength. When the piston rod of the hydraulic oil cylinder is extended, the bracing arm rotates to drive the soil squeezing steel sheet to expand and squeeze the soil. When the piston rod of the hydraulic oil cylinder is retracted, the bracing arm rotates in the opposite direction to drive the soil squeezing steel sheet to shrink and merge into a cylinder. The anchor rod of the present application can be completely recovered and reused, leaving no structure in the underground soil, and will not hinder the development and utilization of underground space in the later stage.

[0005] The technical scheme of the present application is: a support arm type hydraulic expansion anchor rod, comprising an oil pressure gauge, an oil delivery pipe, a reinforcing bar, an anchor device, an anchoring plate, a baffle, an extruding steel sheet, a fixed hinge support, a support arm, a connecting sleeve, a spring, and a hydraulic cylinder, wherein the fixed hinge support comprises a first fixed hinge support, a hydraulic fixed hinge support, and a second fixed hinge support, characterized in that: the two ends of the support arm are hingedly connected with the upper and lower extruding steel sheets through the first and second fixed hinge supports, the oil pressure gauge is connected with the pipe opening of the oil delivery pipe, and the oil delivery pipe connects the oil paths of the plurality of hydraulic cylinders in series; one end of the reinforcing bar is fixedly connected with the anchoring plate through the anchor device, the other end of the reinforcing bar is connected with the support arm in the form of a sleeve or a lock catch structure, the two ends of the support arm are hingedly connected with the two extruding steel sheets through the first and second fixed hinge supports, the piston rod end of the hydraulic cylinder is hingedly connected with the support arm, the bottom of the hydraulic cylinder is hingedly connected with one of the extruding steel sheets through the hydraulic fixed hinge support, the spring is symmetrically installed on the hydraulic fixed hinge support, one end of the spring is connected with the hydraulic fixed hinge support, and the other end of the spring is connected with the support arm.

[0006] According to the support arm type hydraulic expansion anchor rod as described above, the support arm is a structural member with high bending strength, and a hole is arranged in the middle of the support arm.

[0007] According to the support arm type hydraulic expansion anchor rod as described above, the other end of the reinforcing bar is connected with the support arm in the form of a sleeve, the sleeve form is that a strip-shaped hole is arranged in the middle of the support arm, a connecting sleeve is hingedly connected in the strip-shaped hole, one end of the reinforcing bar is connected with the anchoring plate through the anchor device, the other end is fixedly connected with one end of the connecting sleeve, and the connecting sleeves are fixedly connected through the reinforcing bar.

[0008] According to the support arm type hydraulic expansion anchor rod as described above, the connecting sleeve comprises a sleeve and a connecting member, the sleeves are arranged at the two ends of the connecting member, and the connecting member is hingedly connected with the support arm in the strip-shaped hole.

[0009] According to the support arm type hydraulic expansion anchor rod as described above, sleeves are arranged at the two ends of the reinforcing bar to extend the anchoring section of the anchor rod.

[0010] According to the support arm type hydraulic expansion anchor rod as described above, the other end of the reinforcing bar is connected with the support arm in the form of a lock catch structure, the lock catch structure form is that a hole is arranged in the middle of the support arm, a pad layer is arranged on the back of the support arm, the reinforcing bar is passed through the hole in the middle of the support arm and the pad layer, and then the reinforcing bar is clamped by a lock catch so that the reinforcing bar can only move unidirectionally inside the hole.

[0011] The supporting arm type hydraulic expansion anchor rod according to the above has the characteristics that the lock catch comprises fixed end heads and a fixed ring, the internal texture of the fixed end heads is matched with the texture of the reinforcing rib, and the end head of the fixed end head in contact with the pad is a hemisphere, and the two fixed end heads are locked with the reinforcing rib through the fixed ring.

[0012] The supporting arm type hydraulic expansion anchor rod according to the above has the characteristics that the anchor rod is extended through the pad and the lock catch.

[0013] The supporting arm type hydraulic expansion anchor rod according to the above has the characteristics that the top of the compacting steel sheet is provided with a baffle.

[0014] Compared with the traditional grouting anchor rod, the anchor rod of the present application has the advantages that the anchor form is greatly shortened in construction period because grouting is not needed, the anchor rod is mainly assembled in a factory and can be directly placed in an anchor hole and then expanded by hydraulic pressure, so that the anchoring force can be quickly formed, the original stable state of the soil of the slope can be maintained, the anchor rod is suitable for rescue and reinforcement measures in case of danger in slope engineering, the anchor rod can be completely recycled and reused, no structure is left in the soil, and the development and utilization of underground space in the later period are not affected, and the anchor rod is a green and environmentally-friendly anchor rod. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a structure schematic diagram of the anchor rod of Example 1.

[0016] Figure 2 It is a structure schematic diagram of the anchor rod of Example 2.

[0017] Figure 3 It is a schematic diagram of the expanded state of the supporting arm.

[0018] Figure 4 It is a schematic diagram of the contracted state of the supporting arm.

[0019] Figure 5 It is a structure schematic diagram of a supporting arm.

[0020] Figure 6 It is a side view of Figure 5 .

[0021] Figure 7 It is a structure schematic diagram of the supporting arm of another example.

[0022] Figure 8 It is a side view of Figure 7 .

[0023] Figure 9 It is a structure schematic diagram of the anchor rod after extension of Example 1.

[0024] Figure 10 It is a structure schematic diagram of the anchor rod after extension of Example 2.

[0025] Figure 11 Structure diagram of the sleeve of Example 1.

[0026] Figure 12 Structure diagram of the connecting member of Example 1.

[0027] Figure 13 Structure diagram of the connecting sleeve of Example 1.

[0028] Figure 14 Structure diagram of the fixed end of Example 2.

[0029] Figure 15 Structure diagram of the fixed ring of Example 2.

[0030] Figure 16 Structure diagram of the lock structure of Example 2.

[0031] The reference signs are as follows: oil pressure gauge 1, oil delivery pipe 2, reinforcing bar 3, anchor 4, anchoring plate 5, baffle 6, soil squeezing steel sheet 7, fixed hinge support 8, first fixed hinge support 8-1, hydraulic fixed hinge support 8-2, second fixed hinge support 8-3, bracing arm 9, connecting sleeve 10, sleeve 10-1, connecting member 10-2, spring 11, hydraulic oil cylinder 12, cushion layer 13, lock 14, fixed end 14-1, fixed ring 14-2. DETAILED DESCRIPTION

[0032] The technical solutions of the present application are further described below in combination with the drawings.

[0033] As shown in Figure 1 The bracing arm type hydraulic expansion anchor rod of the present application comprises an oil pressure gauge 1, an oil delivery pipe 2, a reinforcing bar 3, an anchor 4, an anchoring plate 5, a baffle 6, a soil squeezing steel sheet 7, a fixed hinge support 8, a bracing arm 9, a connecting sleeve 10, a spring 11, a hydraulic oil cylinder 12, wherein the fixed hinge support 8 comprises a first fixed hinge support 8-1, a hydraulic fixed hinge support 8-2, and a second fixed hinge support 8-3. Figure 3As shown, the two ends of the bracing arm 9 are hinged to the upper and lower two pieces of soil squeezing steel sheet 7 through the first fixed hinge support 8-1 and the second fixed hinge support 8-3 respectively. The oil pressure gauge 1 is connected with the pipe orifice of the oil delivery pipe 2, and the oil delivery pipe 2 connects the oil paths of the plurality of hydraulic oil cylinders 12 in series; the one end of the reinforcing bar 3 is fixedly connected with the anchoring plate 5 through the anchor 4, and the other end is fixedly connected with the connecting sleeve 10, the connecting sleeve 10 is hinged to the bracing arm 9 through the strip-shaped hole in the middle of the bracing arm 9, the connecting sleeves 10 are fixedly connected through the reinforcing bar 3, the two ends of the bracing arm 9 are hinged to the two pieces of soil squeezing steel sheet 7 through the fixed hinge support 8, the piston rod end of the hydraulic oil cylinder 12 is hinged to the bracing arm 9, the bottom of the hydraulic oil cylinder 12 is hinged to the soil squeezing steel sheet 7 through the hydraulic fixed hinge support 8-2, the springs 11 are symmetrically installed on the hydraulic fixed hinge support 8-2, one end of the spring 11 is connected to the hydraulic fixed hinge support 8-2, and the other end of the spring 11 is connected to the bracing arm 9. When the anchor rod is recovered, the piston rod of the auxiliary hydraulic oil cylinder 12 is retracted, and the recoverability of the anchor rod is increased.

[0034] As shown in Figure 5 and Figure 7 , the bracing arm 9 of the present application is a structural member with high bending strength, and a hole is arranged in the middle of the bracing arm 9. When the piston rod of the hydraulic oil cylinder 12 is extended, the bracing arm 9 rotates under the action of the hydraulic oil cylinder 12, driving the soil squeezing steel sheet to expand and press the soil body, as shown in Figure 3 . When the piston rod of the hydraulic oil cylinder 12 is retracted, the bracing arm 9 rotates in the opposite direction under the action of the hydraulic oil cylinder 12, driving the soil squeezing steel sheet 7 to re-shrink and merge into a cylinder, as shown in Figure 4 .

[0035] The connection mode of the reinforcing bar and the bracing arm of the present application is divided into two kinds, as shown in Figure 1 and Figure 2 . The first connection mode is in the form of a sleeve, as shown in Figure 1 and Figure 5 : a strip-shaped hole is arranged in the middle of the bracing arm 9, and a connecting sleeve 10 is hinged in the strip-shaped hole, one end of the reinforcing bar 3 is connected with the anchoring plate through the anchor, and the other end is fixedly connected with one end of the connecting sleeve 10, and the connecting sleeves 10 are fixedly connected through the reinforcing bar 3. As shown in Figures 11 to 14 , the connecting sleeve 10 of the present application includes a sleeve 10-1 and a connecting member 10-2, the sleeve 10-1 is arranged at the two ends of the connecting member 10-2 respectively, and the connecting member 10-2 is hinged to the bracing arm 9 in the strip-shaped hole. As shown in Figure 2As shown, the present application also discloses another support arm type hydraulic expansion anchor rod, comprising an oil pressure gauge 1, an oil delivery pipe 2, a reinforcing bar 3, an anchor device 4, an anchoring plate 5, a baffle 6, a soil squeezing steel sheet 7, a fixed hinge support 8, a support arm 9, a spring 11, a hydraulic oil cylinder 12, a cushion layer 13, and a lock catch 14. Compared with the first embodiment, the second embodiment removes the connecting sleeve 10 and adds the cushion layer 13 and the lock catch 14. After installation, the reinforcing bar 3 can move unidirectionally inside the hole of the support arm 9, but when the anchor rod is working, the reinforcing bar bears the outward pulling force, and the lock catch 14 clamps the reinforcing bar 3 to pull the anchoring section outward together.

[0036] The connecting mode of the reinforcing bar and the support arm of the present application is divided into two kinds, as shown in Figure 1 and Figure 2 The second connecting mode is a lock catch structure, as shown in Figure 2 and Figure 7 The middle of the support arm 9 is provided with a hole, and a cushion layer 13 is arranged on the back of the support arm 9. The reinforcing bar 3 is passed through the hole in the middle of the support arm 9 and the cushion layer 13, and then the reinforcing bar 3 is clamped by the lock catch 14, so that the reinforcing bar 3 can only move unidirectionally inside the hole. When the reinforcing bar 3 bears the outward pulling force, the reinforcing bar 3 pulls the anchoring section together. As shown in Figures 14 to 16 The lock catch 14 of the present application comprises fixed end heads 14-1 and a fixed ring 14-2. The reinforcing bar 3 is clamped in the two fixed end heads 14-1, and the two fixed end heads 14-1 are locked by the fixed ring 14-2. The end head of the fixed end head 14-1 in contact with the cushion layer 13 is a hemisphere, so that the reinforcing bar always maintains a horizontal position when the support arm 9 rotates.

[0037] As shown in Figures 1 to 8 When the piston rod of the hydraulic oil cylinder 12 extends, the support arm 9 rotates around the second fixed hinge support 8-3 as the axis, and drives the soil squeezing steel sheet 7 to expand and squeeze the soil. When the piston rod of the hydraulic oil cylinder 12 retracts, the support arm 9 reverses rotation around the second fixed hinge support 8-3 as the axis, and drives the soil squeezing steel sheet 7 to retract and merge into a cylinder.

[0038] As shown in Figure 9 The present application can be provided with sleeves at both ends of the reinforcing bar 3 to extend the anchoring section of the anchor rod, thereby increasing the anchoring force of the anchor rod by increasing the length of the anchoring section. The anchor rod structure can also be extended by the lock catch, as shown in Figure 10 .

[0039] The top of the soil squeezing steel sheet 7 of the present application is provided with a baffle 6, which increases the contact area of the pulling surface with the soil and further increases the anchoring force, and can prevent the soil from collapsing and affecting the internal structure of the anchor rod.

[0040] The working principle of the present application is: first, a hole with a diameter slightly larger than the combined state of the anchor rod is drilled on the slope to be anchored by the drilling equipment, and the soil squeezing steel sheet 7 of the anchor rod is combined into a cylinder. Then the anchor rod is placed into the hole from the bottom, when the expansion device reaches the specified position, the oil valve of the oil pressure gauge 1 is opened to supply oil, the hydraulic cylinder piston rod extends outward, driving the support arm to rotate around the second fixed hinge support 8-3, the spring 11 is stretched, and the two soil squeezing steel sheets 7 are staggered and expanded to expand and extrude the soil. After the anchoring force is stable, the oil pressure valve is closed.

[0041] When recycling, open the valve to release pressure, the spring device in the hydraulic cylinder 12 and the externally installed spring 11 work together to drive the piston rod to retract into the cylinder, while driving the support arm to rotate, so that the soil squeezing steel sheet 7 is recombined into a cylinder. Finally, the anchor rod is recycled by pulling the anchor steel bar. If it cannot be recycled normally, the anchor steel bar can be pulled to assist in recycling.

[0042] Compared with the existing hydraulic expansion anchor rod, the present application can provide greater anchoring force. The application of the support arm enables the jack to provide a larger expansion area for the anchor rod with a smaller extension length, reducing the requirement for the maximum extension length of the jack. Therefore, the inner wall of the jack can be thickened, the upper limit of the oil pressure can be increased, and the ultimate support force of the jack can be improved, thereby increasing the soil squeezing pressure. Under the condition of increasing the expansion area and the soil squeezing pressure, the anchoring force is also increased. Second, the anchor steel bar is not connected to the hydraulic jack, and the pulling force is entirely borne by the support arm, so the jack does not need to bear the shear force, which can greatly increase the service life of the jack. Third, the hydraulic system controlled by a single oil supply pipe optimizes the operation process of the anchor rod, is more convenient and fast, is beneficial to on-site construction, and can flexibly control the surrounding pressure in the expanded hole. The design structure and installation process are relatively simple, the main part is the expansion device composed of the support arm and the soil squeezing steel sheet, and the feasibility is relatively high. Most of the structure is assembled, if the anchor rod is damaged, it can be recycled and reused. The externally installed spring 11 increases the recyclability of the anchor rod.

Claims

1. A lever-arm type hydraulic expansion anchor bolt, comprising an oil pressure gauge, an oil supply pipe, a tie rod, an anchor, an anchor plate, a baffle, a soil-displacing steel sheet, a fixed hinge support, a lever arm, a connecting sleeve, a spring, and a hydraulic cylinder, wherein the fixed hinge support comprises a first fixed hinge support, a hydraulic fixed hinge support, and a second fixed hinge support, characterized in that: Two ends of the bracing arm are respectively hinged to the upper and lower extruding steel sheets through a first fixed hinge support and a second fixed hinge support, the oil pressure gauge is connected to the pipe opening of the oil delivery pipe, and the oil delivery pipe connects the oil paths of the plurality of hydraulic cylinders in series; one end of the tie bar is fixedly connected to the anchoring plate through an anchor, the other end of the tie bar is connected to the bracing arm in a sleeve form or a lock catch structure form, the piston rod end of the hydraulic cylinder is hinged to the bracing arm, the bottom of the hydraulic cylinder is hinged to one of the extruding steel sheets through a hydraulic fixed hinge support, springs are symmetrically arranged on the hydraulic fixed hinge support, one end of the spring is connected to the hydraulic fixed hinge support, and the other end of the spring is connected to the bracing arm.

2. A hydraulic expansion anchor according to claim 1, wherein: The bracing arm is a structural member with high bending strength, and a hole is arranged in the middle of the bracing arm.

3. A hydraulic expansion anchor according to claim 2, wherein: The other end of the tie bar is connected to the bracing arm in a sleeve form, the sleeve form is that a strip-shaped hole is arranged in the middle of the bracing arm, a connecting sleeve is hinged in the strip-shaped hole, one end of the tie bar is connected to the anchoring plate through an anchor, and the other end is fixedly connected to one end of the connecting sleeve, and the connecting sleeves are fixedly connected through the tie bar.

4. A hydraulic expansion anchor according to claim 3, wherein: The connecting sleeve comprises a sleeve and a connecting member, and the sleeve is arranged at two ends of the connecting member, and the connecting member is hinged to the bracing arm in the strip-shaped hole.

5. A hydraulic expansion anchor according to claim 3, wherein: The sleeve is arranged at two ends of the tie bar, and the anchoring section of the anchor rod is extended.

6. A hydraulic expansion anchor according to claim 2, wherein: The other end of the tie bar is connected to the bracing arm in a lock catch structure form, the lock catch structure form is that a cushion layer is arranged on the back of the bracing arm, the tie bar is passed through the hole in the middle of the bracing arm and the cushion layer, and then the tie bar is clamped by the lock catch, so that the tie bar can only move unidirectionally to the inside of the hole.

7. A hydraulic expansion anchor according to claim 6, wherein: The lock catch comprises fixed end heads and a fixed ring, the internal pattern of the fixed end head is matched with the pattern of the tie bar, the end head in contact with the cushion layer is a hemisphere, and the two fixed end heads are locked to the tie bar through the fixed ring.

8. A hydraulic expansion anchor according to claim 6, wherein: The anchoring section of the anchor rod is extended through the cushion layer and the lock catch.

9. A hydraulic expansion anchor according to claim 1, wherein: The top of the extruding steel sheet is provided with a baffle.

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