CN-116480394-B - Spiral rod type telescopic tensile anchor rod

CN116480394BCN 116480394 BCN116480394 BCN 116480394BCN-116480394-B

Abstract

The invention discloses a screw rod type telescopic tensile anchor rod, which relates to the technical field of anchoring, and comprises an anchor rod head, a screw rod connected with the anchor rod head, a straight rod connected with the screw rod, a reducing sleeve sleeved outside the straight rod and a slotted tensile sleeve ring sleeved outside the reducing sleeve, wherein the reducing sleeve comprises a first constant diameter section and a first reducing section which are mutually communicated, a first expansion nut with matched size is arranged at the communicated position of the first constant diameter section and the first reducing section, the inner diameter of the first reducing section is in narrow change, the slotted tensile sleeve ring is sleeved outside the first reducing section, and is used for being stressed and spread when the first expansion nut moves into the first reducing section, so that the scheme utilizes the screw rod to increase the bonding strength and the anti-sliding performance between the first reducing section and the grouting body, and utilizes the matching of the reducing sleeve ring and the slotted tensile sleeve ring to realize the effect of preventing the drawing slip failure and increasing the tensile pull resistance, thereby solving the problem that the prior art is easy to be broken and failed due to insufficient extensibility.

Inventors

LIU WANG
CHEN YU
HUANG LINCHONG
LIANG YU
LIN CUNGANG
ZHAO CHENYANG

Assignees

中山大学

Dates

Publication Date: 20260508
Application Date: 20230522
Priority Date: 20230222

Claims (8)

1. A screw rod type telescopic tensile anchor rod is characterized in that, The anti-loosening device comprises an anchor rod head, a screw rod connected with the anchor rod head, a straight rod connected with the screw rod, a diameter-reducing sleeve sleeved outside the straight rod, and a slotted tensile sleeve ring sleeved outside the diameter-reducing sleeve; The diameter-reducing sleeve comprises a first constant diameter section and a first diameter-reducing section which are communicated with each other; The inner diameter of the first constant diameter section is a constant value, a first expansion nut is arranged at the connection position of the first constant diameter section and the first reducing section, the outer diameter of the first expansion nut is consistent with the inner diameter of the first constant diameter section, the first expansion nut is sleeved outside the straight rod in a threaded connection mode, a port of the first constant diameter section is of a sealing structure, an extrusion column is arranged in the first constant diameter section and adjacent to the port of the first constant diameter section, the extrusion column is in threaded connection with the end part of the straight rod, a pre-tightening spring is compressed between the extrusion column and the first expansion nut, and the pre-tightening spring is sleeved outside the straight rod; the inner diameter of the first reducing section is changed in a narrowing way in the direction from the first constant diameter section to the screw rod; The split tensile sleeve ring comprises a split sleeve ring and split sleeve tensile fins, wherein the split sleeve ring is provided with a straight slot penetrating through the split sleeve ring, the straight slot extends along the axial direction of the split sleeve ring, the split sleeve ring is used for realizing sleeving, and a plurality of split sleeve tensile fins are arranged around the periphery of the split sleeve ring; When the spiral rod type telescopic tensile anchor rod is pulled, the straight rod drives the first expansion nut to move into the first diameter reduction section, and when the first expansion nut moves into the first diameter reduction section, the slotted tensile sleeve ring is used for being stressed to be spread, specifically, under the acting force of the first expansion nut, the first diameter reduction section is subjected to extrusion expansion to be radially expanded, and further the slotted tensile sleeve ring sleeved outside the first diameter reduction section is spread, so that the slotted tensile sleeve ring is embedded into a grouting body layer or a rock stratum, and drawing resistance is generated.
2. The screw rod type telescopic tensile anchor of claim 1, wherein the first constant diameter section is sleeved with a seamless tensile collar, the seamless tensile collar comprises a seamless collar and sleeved tensile fins, the seamless collar is sleeved outside the first constant diameter section, and a plurality of the sleeved tensile fins are arranged around the circumference of the seamless collar.
3. The screw rod type telescopic tensile anchor according to claim 1, wherein, The diameter-reducing sleeve comprises a first constant diameter section, a first diameter-reducing section, a second constant diameter section and a second diameter-reducing section which are sequentially communicated with each other; The inner diameter of the second constant diameter section is a constant value; The inner diameter of the second reducing section is changed in a narrowing way in the direction from the second constant diameter section to the screw rod; The straight rod is sleeved with a second expansion nut in a threaded manner, the second expansion nut is arranged at the connection position of the second constant diameter section and the second reducing section, and the outer diameter of the second expansion nut is consistent with the inner diameter of the second constant diameter section.
4. A screw rod body type telescopic tensile bolt according to claim 3, wherein the second reduced diameter section is also sleeved with the slotted tensile collar.
5. The screw rod type telescopic tensile rock according to claim 4, wherein said slotted tensile collar is also sleeved outside said second constant diameter section.
6. The screw rod type telescopic tension anchor according to any one of claims 1 to 5, wherein the anchor rod head comprises a connecting rod, a head rubber gasket, a spherical slotted hole tray and a pre-tightening nut, the connecting rod is integrally formed with the screw rod, and the connecting rod sequentially passes through the head rubber gasket and the spherical slotted hole tray and then is in threaded connection with the pre-tightening nut.
7. A screw rod type telescopic tension bolt according to any one of claims 1 to 5, wherein the end nut is threaded in the port of the first constant diameter section.
8. The helical shank type telescopic tension bolt according to any one of claims 1 to 5, wherein the straight shank is further sleeved with a first rubber washer and a second rubber washer, the first rubber washer being compressed between the first expansion nut and the pretensioning spring, the second rubber washer being compressed between the pretensioning spring and the compression abutment.

Description

Spiral rod type telescopic tensile anchor rod Technical Field The invention relates to the technical field of anchoring, in particular to a spiral rod type telescopic tensile anchor rod. Background The deep surrounding rock has the characteristics of high ground temperature, high surrounding pressure, large deformation and strong time effect, is influenced by engineering construction and resource exploitation disturbance, is easy to crush the deep surrounding rock, and further is subjected to large deformation and damage, and forms serious threat to normal construction of engineering, effective exploitation of resources and life and property safety of personnel, so that strengthening effective support of the deep surrounding rock is a key problem to be solved urgently for deep engineering construction and mineral resource exploitation. The anchor rod is a supporting form widely applied to the field of underground engineering supporting, and in order to solve the problems of high stress and large deformation of a deep rock mass, the anchor rod is required to provide an effective supporting force and generate large axial deformation to cooperate with the large deformation of surrounding rock. And traditional twisted steel stock, when supporting in deep country rock, often can be because its extensibility is not enough, easily broken and become invalid, and then cause adverse effect to project organization, seriously influence project organization's stability and security. Therefore, in order to cope with the problem of large deformation of surrounding rock existing in deep surrounding rock, it is highly desirable to develop a tensile anchor rod which is suitable for deep surrounding rock and has stable resistance-increasing deformation performance, so as to effectively cooperate with the deformation of surrounding rock, provide an effective and stable supporting effect, and meet the supporting requirement of deep surrounding rock. Disclosure of Invention The invention aims to provide a screw rod type telescopic tensile anchor rod, which solves the problem that the prior art is easy to break and lose efficacy due to insufficient extensibility. The invention provides a screw rod type telescopic tensile anchor rod, which comprises an anchor rod head, a screw rod connected with the anchor rod head, a straight rod connected with the screw rod, a diameter-reducing sleeve sleeved outside the straight rod and a slotted tensile sleeve ring sleeved outside the diameter-reducing sleeve, wherein the diameter-reducing sleeve comprises a first constant diameter section and a first diameter-reducing section which are mutually communicated, the inner diameter of the first constant diameter section is a constant value, a first expansion nut is arranged at the communicated position of the first constant diameter section and the first diameter-reducing section, the outer diameter of the first expansion nut is identical to the inner diameter of the first constant diameter section, the first expansion nut is sleeved outside the straight rod in a threaded connection mode, the port of the first constant diameter section is of a sealing structure, an extrusion column is arranged inside the first constant diameter section adjacent to the port of the first constant diameter section, the extrusion column is in threaded connection with the end part of the first diameter-reducing sleeve, a pre-tightening spring is compressed between the extrusion column and the first diameter-reducing section, the first expansion nut is in a pre-tightening mode, the first expansion nut is compressed between the extrusion column and the first diameter-reducing section and the first constant diameter-reducing section is stretched out of the first constant diameter section, and the first constant diameter section is stressed by the first expansion nut is stretched out of the first constant diameter section. In one embodiment, the first constant diameter section is sleeved with a seamless tensile sleeve ring, the seamless tensile sleeve ring comprises a seamless sleeve ring and sleeved tensile fins, the seamless sleeve ring is sleeved outside the first constant diameter section, and the plurality of sleeved tensile fins are arranged around the periphery of the seamless sleeve ring. In one embodiment, a second expansion nut is sleeved on the straight rod through threads, the second expansion nut is arranged in the first diameter reduction section, and the outer diameter of the second expansion nut is smaller than that of the first expansion nut. In one embodiment, the diameter-reducing sleeve comprises a first constant diameter section, a first diameter-reducing section, a second constant diameter section and a second diameter-reducing section which are sequentially communicated with each other, wherein the inner diameter of the second constant diameter section is a constant value, the inner diameter of the second diameter-reducing section changes narrowly in