CN210766441U

CN210766441U - Stress low-loss anchorage device

Info

Publication number: CN210766441U
Application number: CN201921363956.2U
Authority: CN
Inventors: 霍炳旭; 沈志翔
Original assignee: Hangzhou Juli Anchor Pole Technology Co ltd
Current assignee: Hangzhou Juli Anchor Pole Technology Co ltd
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2020-06-16
Anticipated expiration: 2029-08-21

Abstract

The utility model discloses a stress low-loss ground tackle, set a plurality of interior taper holes on anchor slab, interior taper hole sets up the locking plate in order pressing from both sides tight steel strand wires, the locking plate sets up in the interior taper hole of the lower extreme at opening the position and moves back the position piece, it chooses for use flexible material to withstand the locking plate with elasticity in order to cushion stress to move back the position piece. The utility model provides a stress low-loss anchor for prestressed steel strand of road bridge or railway bridge.

Description

Stress low-loss anchorage device

Technical Field

The utility model relates to an anchorage device for public road bridge roof beam or railway bridge roof beam specifically indicates a stress low loss anchorage device.

Background

The prestressed concrete assembled hollow slab bridge is a main bridge type of highway or railway bridges in China, and is widely applied to medium and small-span highway bridges. With the influence of a plurality of adverse factors such as rapid increase of traffic volume, vehicle overrun and the like, the existing hollow slab bridge needs to be reinforced during installation or maintenance. The existing common reinforcement mode is external prestress reinforcement, the bearing capacity of the bridge is improved by tensioning external prestress tendons in a tension area of the bridge, the basic principle is that the compressive property of concrete is fully utilized, the external prestress tendons apply prestress on a beam body, and the internal force generated by partial external load is offset by the bending moment generated by the prestress, so that the purposes of improving the structural use performance and improving the ultimate bearing capacity are achieved.

Whether external prestress reinforcement can achieve an expected reinforcement effect or not is closely related to anchoring of external prestress, and for a prestressed concrete assembled hollow slab bridge, the existing anchoring structure and process of external prestress reinforcement is to install prestressed tendons such as steel strands and the like in outer side wall concrete of two side plates at two sides of the hollow slab bridge, then install a prestressed anchorage at one side, and then install an anchorage at the other side, stretch the external prestressed tendons and the like.

In the existing working condition, a steel strand stress beam is penetrated after a hollow pipeline is pre-embedded in a bent cap above a pier, then anchor backing plates (bearing plates) at two ends and a prestressed anchor are installed, then an external prestressed beam is tensioned, and then locking is carried out. The anchor backing plate below the prestressed anchorage device is usually made of iron castings and is vertically and symmetrically arranged at two ends, namely two ends, along the plate girder or the bent cap.

Although the existing anchoring system is installed and constructed quickly, the anchor produces prestress loss in engineering use: the method is characterized in that cement slurry needs to be injected into steel strand penetrating holes reserved in the beams of highway bridges or railways after tensioning, anchors at two ends of the beams often need to be wrapped and poured by concrete, and the cement slurry easily enters into anchor conical holes at two ends of the beams. When the anchor is in a confined state after entering the cement slurry in the tapered hole, the dynamic load from the bridge deck causes the steel strand prestress beam in the beam to generate corresponding tension and relaxation repeated loads, so that the locking plate can not follow up in time, the anchoring force of the anchor is reduced, and the stress loss of the steel strand is caused.

Disclosure of Invention

An object of the utility model is to provide a stress low-loss ground tackle that road bridge roof beam or railway bridge roof beam prestressing force steel strand wires were used.

In order to realize the above-mentioned purpose, the utility model discloses a stress low-loss ground tackle, set a plurality of interior taper holes on anchor slab, interior taper hole sets up the locking plate in order pressing from both sides tight steel strand wires, the locking plate moves back the position piece in the interior taper hole of the lower extreme at opening the position, it uses flexible material to withstand the locking plate with elasticity for use to move back the position piece.

Furthermore, the retreating block is arranged around the inner wall of the inner conical hole, and a through hole is reserved in the retreating block and used for penetrating through the steel strand and matching with the steel strand to block the conical hole.

The utility model has the advantages that: the flexible material is selected for the back-off block, the anchorage device can effectively digest stress increase and decrease caused by repeated load, and the stress loss of the steel strand caused by the repeated load is prevented.

Drawings

FIG. 1 is a schematic structural view of example 1;

FIG. 2 is a schematic view of the installation of the anchor of example 1 prior to the tensioning and locking;

FIG. 3 is a schematic view of the installation of the anchor of example 1 after it has been tensioned and locked;

in the drawings, a backing plate 1 is adjustable; an anchor plate 2; a bit backing block 9; a locking plate 10; the steel strands 11.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Example 1

As shown in fig. 1, the stress low-loss anchor device of the present embodiment includes an anchor plate 2, the anchor plate 2 is provided with 7 inner taper holes 21, each inner taper hole is regularly arranged, a locking plate 10 is arranged in each inner taper hole 21, the locking plate 10 is a split tapered clamping plate, and the split tapered clamping plate is composed of two or more claw-shaped locking plates.

The inner taper hole 21 is provided with a retreating block 9 at the bottom of the opening part of the tapered clamping piece, and the locking piece is tightly propped by the retreating block 9; the receding block 9 is made of flexible materials, so that the conical clamping piece 10 is prevented from being in a restrained state after the small end of the inner conical hole 21 enters cement paste, and cannot follow up again in time when being wrapped by concrete.

And when the repeated dynamic load from the road surface is detected, the retreating block 9 can provide a space (retreating) for two (more) times of follow-up of the conical clamping piece 10, and the prestress loss of the steel strand caused by the fatigue load of the anchorage device can be effectively reduced.

The receding block 9 is attached to the inner wall of the inner cone hole 21, a through hole is reserved for penetrating through the steel strand 11, the steel strand 11 is matched to block the conical hole, and a flexible filling body or an anticorrosive material filled in the inner cone hole 21 can be matched and sealed.

The utility model discloses a stress low-loss anchorage device, simple structure, steel strand wires are convenient to install, and the steel strand wires prestress loss caused by repeated load of the anchorage device can be effectively prevented when the anchorage device is used in engineering; can ensure the long-term effective anchoring stability of the anchorage device.

The above-mentioned embodiments are only for illustrating the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present patent and to implement the same, so the scope of the present patent should not be limited by the embodiments, i.e. all equivalent changes and modifications made according to the spirit of the present patent disclosure still fall within the scope of the present patent.

Claims

1. The utility model provides a stress low-loss ground tackle, includes anchor slab, sets a plurality of interior taper holes on the anchor slab, the downthehole locking plate that sets of interior taper is with pressing from both sides tight steel strand wires, its characterized in that: the locking plate sets up in the inner taper hole of the lower extreme at the position of opening a mouthful and moves back the position piece, move back the position piece and choose for use flexible material withstands the locking plate with elasticity with buffering stress.

2. The stress low loss anchor of claim 1, wherein: the retreating block is arranged around the inner wall of the inner cone hole, and a through hole is reserved in the retreating block and used for penetrating through the steel strand and matching with the steel strand to block the cone hole.