CN111809620A

CN111809620A - Prestressed steel anchor pipe anchor cable tensioning device

Info

Publication number: CN111809620A
Application number: CN202010600727.9A
Authority: CN
Inventors: 张玉芳; 罗骋华; 万军利; 周文皎; 李健
Original assignee: Railway Engineering Research Institute of CARS
Current assignee: Railway Engineering Research Institute of CARS
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-10-23

Abstract

The invention discloses a prestressed steel anchor pipe and anchor cable tensioning device which comprises a steel anchor pipe and an anchor cable, wherein a working backing plate is sleeved on the steel anchor pipe, a working nut is in threaded connection with the outer side of the working backing plate, a tensioning backing plate is arranged on the outer side of the working nut, the tensioning backing plate straddles the steel anchor pipe, a tensioning nut is in threaded connection with the outer side of the tensioning backing plate, the tensioning backing plate is fastened on the working nut by the tensioning nut, a steel support is sleeved on the outer side of the tensioning backing plate, a working anchor is fixed on the outer side of the other end face of the steel support, a bearing plate is fixed on the outer side of the working anchor, a jack is fixed on the outer side of the bearing plate, a tool anchor is fixed on the outer side of the jack, a limiting backing plate is fixed on the. The device fuses the stretch-draw of steel anchor pipe and anchor rope to one set of device, both can accomplish the stretch-draw of steel anchor pipe, can accomplish the stretch-draw of anchor rope again, has saved a large amount of stretch-draw steps, has improved work efficiency.

Description

Prestressed steel anchor pipe anchor cable tensioning device

Technical Field

The invention relates to the technical field of engineering construction, in particular to a prestressed steel anchor pipe and anchor cable tensioning device which is suitable for slope reinforcement engineering of highways, railways, mines, municipal works and the like.

Background

The slope anchoring engineering is used as a hidden engineering, main materials of steel and concrete are buried in various types of rock-soil bodies, an anchoring section is in a stratum where underground water is relatively developed, hole collapse and hole shrinkage are easy to occur in the drilling process, the installation difficulty of an anchor cable is relatively high, the binding force between the anchoring section and a soil layer is limited, and the mechanical properties such as durability and strength of an anchoring structure are reduced due to long-term contact with the underground water and a site soil medium. The method improves the stratum anchoring effect and solves the problem of anchor cable installation, and besides the improvement of the prior art, the method also needs to be combined with a continuously developed new technology to improve the stability of slope anchoring. The steel anchor pipe and the anchor cable are two common anchoring tools in the process of slope anchoring, and the steel anchor pipe and the anchor cable are often matched for use so as to improve the anchoring effect. However, the tensile strength of the steel anchor pipe and the tensile strength of the anchor cable are different, and the tensile strength of the anchor cable is higher than that of the steel anchor pipe, so that the steel anchor pipe needs to be tensioned firstly and then the steel anchor pipe needs to be tensioned, and the steel anchor pipe and the anchor cable need to be tensioned separately by using different tensioning tools in the tensioning process, and the tensioning mode is complex in process, time-consuming and labor-consuming.

Disclosure of Invention

In order to solve the problems, the invention designs a prestressed steel anchor pipe and anchor cable tensioning device, which integrates the tensioning of a steel anchor pipe and an anchor cable into a set of device, can complete the tensioning of the steel anchor pipe and the anchor cable, saves a large number of tensioning steps, improves the working efficiency and saves a large number of manpower and material resources.

In order to achieve the technical effects, the invention is realized by the following technical scheme:

a prestressed steel anchor pipe and anchor cable tensioning device comprises a steel anchor pipe and an anchor cable, wherein one end of the anchor cable is fixed in the steel anchor pipe, the other end of the anchor cable extends out of the end part of the steel anchor pipe, the front end of the steel anchor pipe is anchored in a drill hole, the rear end of the steel anchor pipe extends out of a frame beam, a working backing plate is sleeved on the steel anchor pipe, a working nut is in threaded connection with the outer side of the working backing plate, a tensioning backing plate is arranged on the outer side of the working nut and straddles the steel anchor pipe, a tensioning nut is in threaded connection with the outer side of the tensioning backing plate and fastens the tensioning backing plate on the working nut, a steel support is sleeved on the outer side of the tensioning backing plate, one end of the steel support is supported on the working backing plate, a working anchor is fixed on the outer side of the other end face of the steel support, a bearing plate is fixed on the outer side of the working anchor, the limiting base plate is provided with a connecting screw hole, the screw rod sequentially penetrates through the limiting base plate, the jack and the tensioning base plate, and two ends of the screw rod are in threaded connection with locking nuts. The working anchorage device, the bearing plate and the tool anchorage device are provided with anchor holes, conical clamping pieces are inserted into the anchor holes, and the anchor cable sequentially penetrates through the working base plate, the working nut, the tensioning base plate, the tensioning nut, the steel support, the working anchorage device, the bearing plate, the jack, the working anchorage device and the limiting base plate and extends out of the limiting base plate.

Furthermore, the steel support consists of a top plate and a pair of side plates, the side plates are fixed on two sides of the top plate, and a beam penetrating hole is formed in the top plate.

Furthermore, a U-shaped clamping groove is formed in the tensioning base plate, and a screw hole is formed in each of four corners of the tensioning base plate.

The invention has the beneficial effects that: the device fuses the stretch-draw of steel anchor pipe and anchor rope to one set of device, both can accomplish the stretch-draw of steel anchor pipe, can accomplish the stretch-draw of anchor rope again, has saved a large amount of stretch-draw steps, has improved work efficiency to and practiced thrift a large amount of manpowers and material resources.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a sectional view of an assembly structure of a prestressed steel anchor pipe anchor cable tensioning device;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a sectional view taken along line B-B of FIG. 1;

FIG. 4 is a schematic view of the construction of the tension mat;

fig. 5 is a schematic structural view of the steel support.

In the drawings, the components represented by the respective reference numerals are listed below:

1-drilling, 2-secondary grouting, 3-primary grouting, 4-surrounding rock, 5-secondary grouting, 6-anchor cable, 7-steel anchor pipe, 8-frame beam, 9-working backing plate, 10-working nut, 11-steel support, 12-tension backing plate, 13-tension nut, 14-working anchor, 15-bearing plate, 16-jack, 17-tool anchor, 18-limiting backing plate, 19-screw rod, 20-locking nut, 21-screw hole, 22-U-shaped clamping groove, 23-wing plate, 24-top plate, 25-side plate and 26-through-beam hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-3, a prestressed steel anchor pipe and anchor cable tensioning device comprises a steel anchor pipe 7 and an anchor cable 6, wherein one end of the anchor cable 6 is fixed in the steel anchor pipe 7, and the other end of the anchor cable extends out of the end of the steel anchor pipe 7, the front end of the steel anchor pipe 7 is anchored in a borehole 1, and the rear end of the anchor cable extends out of a frame beam 8, a working pad 9 is sleeved on the steel anchor pipe 7, a working nut 10 is connected to the outer side of the working pad 9 through a thread, a tensioning pad 12 is arranged on the outer side of the working nut 10, the tensioning pad 12 straddles the steel anchor pipe 7, a tensioning nut 13 is connected to the outer side of the tensioning pad 12 through a thread, the tensioning nut 13 fastens the tensioning pad 12 on the working nut 10, a steel support 11 is sleeved on the outer side of the tensioning pad 12, one end of the steel support 11 is supported on the working pad 12, a working anchor 14 is fixed on, a jack 16 is fixed on the outer side of the bearing plate 15, a tool anchor 17 is fixed on the outer side of the jack 16, a limiting base plate 18 is fixed on the outer side of the tool anchor 17, a connecting screw hole is formed in the limiting base plate 18, a screw rod 19 sequentially penetrates through the limiting base plate 18, the jack 16 and the tensioning base plate 12, and locking nuts 20 are connected to two ends of the screw rod 19 in a threaded mode. Anchor holes are formed in the working anchor 14, the bearing plate 15 and the tool anchor 17, conical clamping pieces are inserted into the anchor holes, and the anchor cable 6 sequentially penetrates through the working backing plate 9, the working nut 10, the tensioning backing plate 12, the tensioning nut 13, the steel support 11, the working anchor 14, the bearing plate 15, the jack 16, the working anchor 17 and the limiting backing plate 18 and extends out of the limiting backing plate 18.

As shown in fig. 4, the tensioning pad 12 is provided with a U-shaped slot 22, and four corners of the tensioning pad 12 are respectively provided with a screw hole 21.

As shown in fig. 5, the steel support 11 is composed of a top plate 24 and a pair of side plates 25, the side plates 25 are fixed on both sides of the top plate 24, and the top plate is provided with a beam-passing hole 26.

One specific application of the invention is:

(1) tensioning the anchor cable: fixing the front end of an anchor cable at the front end of a steel anchor pipe 7, fixing a grouting pipe on the outer wall of the steel anchor pipe 7, conveying the steel anchor pipe 7 and the grouting pipe together to the bottom of a drill hole 1, injecting grout into the drill hole 1 through the grouting pipe, forming primary grout 3 after initial setting of the grout, building a frame beam 8 on the surface of a surrounding rock 4, reserving a certain extending length for the steel anchor pipe 7, sequentially assembling a working backing plate 9, a working nut 10, a tensioning backing plate 12, a tensioning nut 13, a steel support 11, a working anchor 14, a bearing plate 15, a jack 16 and a working anchor 17, enabling the anchor cable 6 to pass through the working backing plate 9, the working nut 10, the backing plate 12, the tensioning nut 13, the steel support 11, the working anchor 14, the bearing plate 15, the jack 16 and the working anchor 17, connecting the jack 16 with an oil pump, starting the oil pump, and enabling the jack 16 to tension the anchor cable 6.

(2) Tensioning the steel anchor pipe: after the primary grouting body 3 is initially set, injecting the grout through a steel anchor pipe 7, splitting and injecting the grout into the primary grouting body 3 through a secondary grouting hole 5 of the steel anchor pipe 7, and initially setting the grout in the steel anchor pipe 7 to form a secondary grouting body 2; subsequently, the limit backing plate 18 is fixed on the outer side of the working anchor 17, the screw rod 19 penetrates through the limit backing plate 18, the jack 16 and the tensioning backing plate 12, the locking nuts 20 are screwed into two ends of the screw rod 19, so that the limit backing plate 18 is fixed on the working anchor 17, the oil pump is started, the tensioning force is transmitted to the screw rod 19 through the limit backing plate 18, the screw rod 19 transmits the tensioning force to the tensioning backing plate 12, the tensioning backing plate 12 pushes the tensioning nut 13, the tensioning nut 13 is in threaded connection with the steel anchor pipe 7, and the tensioning nut 13 transmits the tensioning force to the steel anchor pipe 7, so that the steel anchor pipe 7 is tensioned.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A prestressed steel anchor pipe and anchor cable tensioning device comprises a steel anchor pipe and an anchor cable, wherein one end of the anchor cable is fixed in the steel anchor pipe, the other end of the anchor cable extends out of the end part of the steel anchor pipe, the front end of the steel anchor pipe is anchored in a drill hole, and the rear end of the steel anchor pipe extends out of a frame beam. A limiting base plate is fixed on the outer side of the tool anchorage device, a connecting screw hole is formed in the limiting base plate, a screw rod sequentially penetrates through the limiting base plate, a jack and a tensioning base plate, and locking nuts are connected to two ends of the screw rod in a threaded mode; the working anchorage device, the bearing plate and the tool anchorage device are provided with anchor holes, conical clamping pieces are inserted into the anchor holes, and the anchor cable sequentially penetrates through the working base plate, the working nut, the tensioning base plate, the tensioning nut, the steel support, the working anchorage device, the bearing plate, the jack, the working anchorage device and the limiting base plate and extends out of the limiting base plate.

2. The prestressed steel anchor pipe anchor cable tensioning device as claimed in claim 1, wherein the steel support is composed of a top plate and a pair of side plates, the side plates are fixed on two sides of the top plate, and the top plate is provided with a through-beam hole.

3. The prestressed steel anchor pipe and anchor cable tensioning device as claimed in claim 1, wherein the tensioning pad plate is provided with a U-shaped slot, and four corners of the tensioning pad plate are respectively provided with a screw hole.