CN-115059489-B - Expansion shell type prestressed anchor rod

CN115059489BCN 115059489 BCN115059489 BCN 115059489BCN-115059489-B

Abstract

The application provides an expansion shell type prestressed anchor rod which comprises a threaded rod with a front end and a rear end, a wedge sleeve assembled at the front end of the threaded rod and an expansion shell matched with the wedge sleeve, wherein the threaded rod is provided with a first thread, at least part of thread teeth of the first thread are provided with a second thread, the pitch of the second thread is smaller than that of the first thread, and the wedge sleeve is matched with the second thread. The expansion shell type prestressed anchor rod provided by the application is convenient to install and high in construction efficiency.

Inventors

WU HANGTONG
WANG YONG
SHEN YANFANG
ZHOU BIAO
LV ZHIPING

Assignees

杭州图强工程材料有限公司
杭州图强工程材料有限公司

Dates

Publication Date: 20260421
Application Date: 20220525
Priority Date: 20220525

Claims (9)

1. The utility model provides a shell-expanding type prestressed anchor, including the threaded rod that has front end and rear end, assemble in the wedge cover of threaded rod front end and with wedge cover matched with expands the shell, its characterized in that, the threaded rod has first screw thread, be equipped with the second screw thread on the at least partial screw thread tooth of first screw thread, the pitch of second screw thread is less than the pitch of first screw thread, the wedge cover with second screw thread cooperation, threaded rod full segment has first screw thread, shell-expanding type prestressed anchor includes fastening nut, fastening nut with first screw thread cooperation.
2. An expanding shell type prestressed rock bolt according to claim 1, wherein the pitch of said second screw thread is 0.1-0.5 times that of said first screw thread, and the lead angle of said second screw thread is 0.5-3 °.
3. An expanding shell type prestressed rock bolt according to claim 1, wherein the centre of the threaded rod is provided with a grouting hole.
4. A shell-and-socket pre-stressed anchor as claimed in claim 2, wherein the shell comprises, in the length direction of the threaded rod, a mating section which abuts against the periphery of the wedge sleeve, and a suspension section which is located outside the threaded rod, and wherein the shell comprises, in the circumferential direction of the threaded rod, at least two expansion plates, and wherein the shell-and-socket pre-stressed anchor further comprises a snap ring which is arranged around the suspension section, the snap ring being used to tighten each of the expansion plates.
5. A shell-and-tube prestressed rock bolt according to claim 4, wherein said snap ring includes an elastic strip extending along the circumference of said threaded rod, and wherein the ends of said elastic strip overlap each other in the circumference of said threaded rod.
6. An expanding shell type prestressed anchor according to claim 4, further comprising a clamping member fixed at the front end of the expanding shell, wherein the clamping member is U-shaped and comprises two side walls arranged oppositely and a bottom wall connected between the two side walls, the two side walls are respectively fixed at the radial outer side of the expanding shell, the bottom wall is positioned at one side of the front end of the threaded rod, and the rear ends of the two side walls are provided with barb structures which warp outwards.
7. A shell-and-tube prestressed anchor according to claim 4, wherein a crack gap is provided between two adjacent expansion pieces, said crack gap extends toward the front end of said threaded rod and gradually increases in width, and a protrusion portion adapted to the shape of said crack gap is provided on the outer periphery of said wedge sleeve.
8. An expansion shell type prestressed anchor according to claim 7, wherein said convex portion is provided with a backflow groove extending along the length direction of said threaded rod, for backflow of slurry in the grouting holes to the rear end of said threaded rod.
9. A shell-and-tube prestressed rock bolt according to claim 1, further comprising a pallet, ball pad fixed to the tail end of said threaded rod, said ball pad being pressed between said pallet and said fastening nut.

Description

Expansion shell type prestressed anchor rod Technical Field The application relates to the technical field of anchor rods, in particular to an expansion shell type prestress anchor rod. Background The anchor bolt support is the main support form of the coal mine tunnel. Compared with the common mortar anchor rod, the expansion shell type anchor rod omits the solidification time of the anchoring agent, can meet the construction requirement of quick anchoring, has higher safety, and is widely applied to the support of underground engineering. The expansion shell type anchor rod mainly comprises an anchor head, a threaded rod, a tray, a fastening nut and the like, wherein the anchor head comprises an expansion shell and a wedge sleeve which are matched with each other. Early expansion shell type anchor rods expand the expansion shell by applying a pulling force along the length direction of a threaded rod, so that a lock nut at the tail of the rod is pulled away from the surrounding wall of a roadway, and therefore, the lock nut needs to be further screwed to maintain prestress, and the construction steps are complicated. Disclosure of Invention The application provides an expansion shell type prestressed anchor rod which is more convenient to install and is beneficial to improving the construction efficiency. The application provides an expansion shell type prestressed anchor rod which comprises a threaded rod with a front end and a rear end, a wedge sleeve assembled at the front end of the threaded rod and an expansion shell matched with the wedge sleeve, wherein the threaded rod is provided with a first thread, at least part of thread teeth of the first thread are provided with a second thread, the pitch of the second thread is smaller than that of the first thread, and the wedge sleeve is matched with the second thread. The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions. Optionally, the pitch of the second thread is 0.1-0.5 times that of the first thread, the lift angle of the second thread is 0.5-3 degrees, and a grouting hole is formed in the center of the threaded rod. Optionally, in the length direction of the threaded rod, the expansion shell comprises a fitting section which is attached to the periphery of the wedge sleeve, and a suspension section which is located on the outer side of the threaded rod, in the circumferential direction of the threaded rod, the expansion shell comprises at least two expansion pieces, the expansion shell type prestressed anchor rod further comprises a clamping ring which is sleeved on the suspension section, and the clamping ring is used for tightening each expansion piece. Optionally, the snap ring includes an elastic strip extending along a circumferential direction of the threaded rod, and two ends of the elastic strip overlap each other in the circumferential direction of the threaded rod. Optionally, the shell-expanding type prestress anchor rod further comprises a clamping piece fixed at the front end of the shell-expanding type prestress anchor rod, wherein the clamping piece is U-shaped and comprises two side walls which are oppositely arranged and a bottom wall connected between the two side walls, the two side walls are respectively fixed on the radial outer side of the shell-expanding type prestress anchor rod, the bottom wall is located at one side of the front end of the threaded rod, and the rear ends of the two side walls are provided with barb structures which warp outwards. Optionally, a crack gap is arranged between two adjacent expansion sheets, the crack gap extends towards the front end of the threaded rod, the width of the crack gap is gradually increased, and a bulge which is adaptive to the shape of the crack gap is arranged on the periphery of the wedge sleeve. Optionally, the protruding portion is provided with a backflow groove extending along the length direction of the threaded rod, so that the slurry in the grouting hole flows back to the rear end of the threaded rod. Optionally, the expansion shell type prestressed anchor further comprises a supporting plate, a ball pad and a fastening nut, wherein the supporting plate, the ball pad and the fastening nut are fixed at the tail end of the threaded rod, the fastening nut is matched with the first thread, and the ball pad is extruded and acted between the supporting plate and the fastening nut. Optionally, the shell-expanding type prestressed anchor further comprises a supporting plate, a ball pad and a fastening nut, wherein the supporting plate, the ball pad and the fastening nut are fixed at the tail end of the threaded rod, and the fastening nut and the ball pad are integrally formed with the threaded rod. Th