Counter-pull detection device for prestress under anchor

Abstract

The counter-pull detection device comprises a self-locking jack, a displacement sensor, an inner cylinder and a base, the inner cylinder is sleeved with the base in a sliding mode, a limiting groove is formed in the outer side of the inner cylinder, and a limiting sliding block is arranged on the outer side of the base; a supporting lantern ring is arranged in the inner cylinder, and a pushing structure is arranged on the side, facing the base, of the supporting lantern ring. An extrusion cylinder is arranged in the base, one end of the extrusion cylinder abuts against the pushing structure, the other end of the extrusion cylinder is connected with the inner wall of the base to form an annular groove, a spring and a pressing block which sleeve the outer side of the extrusion cylinder are arranged in the annular groove, and the pressing block is arranged at the end, close to the inner cylinder, of the spring; the self-locking jack is arranged at the end, away from the base, of the inner cylinder. The signal input end of the pushing structure is connected with the signal output end of the displacement sensor. According to the counter-pull detection device for the pre-stress under the anchor, a pushing structure for axially bearing pressure to lock the inner cylinder and the base is arranged, so that the counter-pull detection device is high in bearing capacity and not easy to damage or bend.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of anchor prestress detection, in particular to a kind of reverse pulling detection device of anchor prestress. BACKGROUND

[0002] The reverse pulling detection of anchor prestress is the key detection method for verifying prestressed anchor rod construction quality, anchoring performance and prestress loss condition.The core is to apply reverse pulling force (i.e.simulate the reverse load of actual stress direction of anchor rod) to the anchor rod that has been tensioned and locked, to evaluate the bearing capacity of anchor rod, the bonding strength of anchoring section and stratum and the effectiveness of prestress after locking.The existing public number CN212621929U reverse pulling detection device of anchor prestress uses the mode that air cylinder passes through the clamping groove of inner cylinder inserted into the inner wall of base to lock the position of both, uses displacement sensor to detect the elongation of anchor rod deformation, and when the elongation reaches the specified elongation, drive air cylinder to deliver signal, so that air cylinder retracts and separates from base clamping groove, inner cylinder and base can be relatively displaced, to avoid permanent damage caused by further increase of anchor rod elongation;However, during reverse pulling detection, the radial force borne by air cylinder before separating from clamping groove is large, which is easy to cause bending or permanent damage. SUMMARY

[0003] In view of the above problems, the utility model provides a kind of reverse pulling detection device of anchor prestress, set up the pushing structure of axial bearing pressure locking inner cylinder and base, strong bearing capacity, not easy to damage or bend.

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of reverse pulling detection device of anchor prestress, including self-locking jack, displacement sensor, inner cylinder and base, the base is slidably covered in the outer of inner cylinder, the outer side of the inner cylinder is equipped with limit slot, the outer side of the base near inner cylinder one end is equipped with limit sliding block sliding in limit slot;The support ring is arranged in the inner cylinder, and the pushing structure is arranged on the side of the support ring facing the base in axial direction;The extrusion cylinder is arranged in the base, one end of the extrusion cylinder is abutted with the pushing structure, the other end is connected with the inner wall of base to form annular groove, the width of annular groove is greater than the thickness of inner cylinder, spring and pressing block are arranged in annular groove, the pressing block is arranged at the end of spring close to inner cylinder;The self-locking jack is arranged at the end of inner cylinder away from base, and the signal input end of pushing structure is connected with the signal output end of displacement sensor.

[0006] In further technical solutions, the pushing structure is air cylinder.

[0007] In further technical solutions, the end of air cylinder is provided with extrusion block.

[0008] In a further technical solution, the extrusion cylinder is provided with a limiting ring of the pressing block at one end close to the inner cylinder, and the distance between the limiting ring and the inner wall of the base is greater than the thickness of the inner cylinder.

[0009] In a further technical solution, the side of the limiting ring facing the inner cylinder is provided with a buffer cushion.

[0010] The utility model discloses beneficial effect is:

[0011] 1, the anchor rod can pass through the extrusion cylinder and the inner cylinder connecting self-locking jack, the initial state of cylinder is elongated, and the end of extrusion cylinder is abutted, the limiting slide block of base is in the one end of limiting groove far from self-locking jack at this time, realize the locking of position between base and inner cylinder, when self-locking jack pulls the anchor rod and elongates to the specified elongation, displacement sensor sends the signal of contraction to cylinder, and cylinder is separated from extrusion cylinder, and the inner cylinder can move towards the base direction, avoid the further increase of the elongation of anchor rod, when the inner cylinder is subsequently displaced to base, can be abutted with the pressing block, and the spring in annular groove is compressed, and the action of spring can slow down the impact trend of inner cylinder, adopt the position of the pushing structure of axial arrangement and combine the position of limiting groove and lock the position of base and inner cylinder, and the pushing structure of axial arrangement bears the capacity, and it is not easy to damage or bend.

[0012] 2, the extrusion block of cylinder end can increase the stress area of extrusion cylinder, and pushing is more stable.

[0013] 3, set up limiting ring to avoid the pressing block to separate from extrusion groove. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the cross section schematic view of the anchor pre-stress anti-pulling detection device of the utility model embodiment.

[0015] BRIEF DESCRIPTION OF DRAWINGS:

[0016] 10, self-locking jack;20, displacement sensor;30, inner cylinder;31, limiting groove;32, support collar;40, base;41, limiting slide block;42, extrusion cylinder;43, spring;44, pressing block;45, buffer cushion;51, cylinder;52, extrusion block;60, anchor rod. DETAILED DESCRIPTION

[0017] The embodiments of the utility model will be further explained in connection with the drawings.

[0018] Embodiment:

[0019] As Figure 1As shown, a kind of anchorage prestress back tension detection device, including self-locking jack 10, displacement sensor 20, inner cylinder 30 and base 40, base 40 is slidably set in the outer of inner cylinder 30, the outer of inner cylinder 30 is equipped with limiting slot 31, base 40 is equipped with the limiting slide 41 of sliding in the limiting slot 31 on the outer side of one end of inner cylinder 30;Coaxial support ring 32 is equipped in inner cylinder 30, support ring 32 can be connected the inner wall of inner cylinder 30 by welding;Pushing structure is axially equipped on the side of support ring 32 facing base 40, and two symmetrical cylinders 51 can be selected;Coaxial extrusion cylinder 42 is equipped in base 40, one end of extrusion cylinder 42 can be abutted with the end of cylinder 51, the other end is connected with the inner wall of base 40 to form annular groove, the width of annular groove is greater than the thickness of inner cylinder 30, spring 43 and pressing block 44 that are sleeved on the outer side of extrusion cylinder 42 are equipped in annular groove, and pressing block 44 is equipped at the end of spring 43 close to inner cylinder 30;Self-locking jack 10 is equipped at the end of inner cylinder 30 away from base 40, and the signal input end of pushing structure is connected with the signal output end of displacement sensor 20.

[0020] The working principle of the above technical solution is as follows:

[0021] When in use, base 40 is fixed on the surface of the base body at the position to be detected, anchor rod 60 can pass through extrusion cylinder 42 and inner cylinder 30 to connect self-locking jack 10, cylinder 51 is in the initial state of extension, and is abutted with the end of extrusion cylinder 42, at this time, limiting slide 41 of base 40 is at the end of limiting slot 31 away from self-locking jack 10, so that the position between base 40 and inner cylinder 30 is locked, when self-locking jack 10 pulls anchor rod 60 to extend to the specified extension amount, displacement sensor 20 sends a signal of contraction to cylinder 51, cylinder 51 is separated from extrusion cylinder 42, and inner cylinder 30 can move towards base 40, so as to avoid that the extension amount of anchor rod 60 is further increased and damaged, when inner cylinder 30 is subsequently displaced towards base 40, can be abutted with pressing block 44, spring 43 in annular groove is compressed, and the action of spring 43 can slow down the impact trend of inner cylinder 30.

[0022] In another embodiment, as shown in Figure 1 The end of cylinder 51 is provided with extrusion block 52.

[0023] Extrusion block 52 at the end of cylinder 51 can increase the stress area of extrusion cylinder 42, and pushing is more stable.

[0024] In another embodiment, as shown in Figure 1 The end of extrusion cylinder 42 close to inner cylinder 30 is provided with a limiting ring of pressing block 44, and the distance between the limiting ring and the inner wall of base 40 is greater than the thickness of inner cylinder 30.

[0025] The limiting ring is arranged to limit the movement of pressing block 44, so as to avoid that pressing block 44 is separated from the extrusion groove.

[0026] In another embodiment, as shown in Figure 1 The limiting ring is provided with a buffer soft pad 45 on one side facing the inner cylinder 30, which can be made of rubber.

[0027] The direct collision and deformation of the inner cylinder 30 and the pressing block 44 can be avoided.

[0028] The above embodiments only express the specific implementation manners of the present application, and the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application.

Claims

1. A device for detecting the back tension of pre-stressing under an anchor, characterized in that, Including self-locking jack, displacement sensor, inner cylinder and base, the base is sleeved on the outer side of the inner cylinder, the outer side of the inner cylinder is provided with a limiting groove, the base is provided with a limiting sliding block which is slidably arranged in the limiting groove on the outer side of the inner end of the inner cylinder; The inner cylinder is provided with a support ring, the side of the support ring facing the base is provided with a pushing structure in the axial direction; The base is provided with an extrusion cylinder, one end of the extrusion cylinder abuts against the pushing structure, the other end is connected with the inner wall of the base to form an annular groove, the width of the annular groove is greater than the thickness of the inner cylinder, the annular groove is provided with a spring and a pressing block which are sleeved on the outer side of the extrusion cylinder, the pressing block is arranged on the end of the spring close to the inner cylinder; The self-locking jack is arranged at the end of the inner cylinder away from the base, and the signal input end of the pushing structure is connected with the signal output end of the displacement sensor.

2. The device for detecting the reverse tension of the prestress under the anchor according to claim 1, characterized in that, The pushing structure is a gas cylinder.

3. The device for detecting the reverse tension of the prestress under the anchor according to claim 2, characterized in that, The end of the gas cylinder is provided with an extrusion block.

4. The device for detecting the reverse tension of the prestress under the anchor according to claim 1, characterized in that, The end of the extrusion cylinder close to the inner cylinder is provided with a limiting ring of the pressing block, and the distance between the limiting ring and the inner wall of the base is greater than the thickness of the inner cylinder.

5. The device for detecting the reverse tension of the prestress under the anchor according to claim 4, characterized in that, The side of the limiting ring facing the inner cylinder is provided with a buffer soft pad.

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