CN112502756A

CN112502756A - Precession type grouting anchor rod structure and using method

Info

Publication number: CN112502756A
Application number: CN202011368644.8A
Authority: CN
Inventors: 曹启坤; 滑阳阳; 范伟
Original assignee: Liaoning Technical University
Current assignee: Liaoning Technical University
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-03-16

Abstract

A screw-in grouting anchor rod structure and a using method thereof comprise an anchor rod main body, a grouting pipe, a tray and a nut; the whole anchor rod main part is provided with threads, one end of the anchor rod main part is provided with a drill bit with a curvature continuous change round hole at the bottom, the grouting pipe and the round hole at the bottom of the drill bit form a two-stage grouting structure through nesting, a supporting structure is formed after high-pressure grouting, and the other end of the anchor rod main part is connected with the tray and the nut through threads. According to the anchor rod, the anchor rod main body is drilled, the external support is formed through grouting impact after the drilling is completed, a two-stage grouting structure is formed and is directly contacted with a rock-soil body, the problem that the anchoring force is reduced due to the fact that the traditional anchor rod is corroded in the rock-soil for a long time can be solved, the manufacturing mode and the operation mode are simple, construction is easy, and the anchoring force is high.

Description

Precession type grouting anchor rod structure and using method

Technical Field

The invention relates to the technical field of slope and roadway support, in particular to a screw-in grouting anchor rod structure and a using method thereof.

Background

With the rapid improvement of economic requirements of foundation construction and development entities, the resource exploitation is rapid, the resource exploitation under complex geological conditions is in force, and the anchor rod is taken as a convenient and rapid anchoring member, plays a key role in reinforcing rock and soil mass, and brings great convenience to engineering construction. The rock-soil mass is balanced and broken and lead to the structural instability after excavating in the ground body in the construction, new stress field needs to reach the stability with the help of external force to form, the anchoring force of the stock is as the most common external force of new stress field balance, the stock because of self simple structure, easy construction, characteristics such as extensive application range are used in construction sites such as side slope treatment, road bridge, underground space engineering, tunnel engineering, coal mining tunnel support extensively, accelerated the engineering progress and saved engineering time and cost.

The existing anchor rods are various in types, but most of the existing anchor rods have the problems of insufficient anchoring force, easy falling and the like, and particularly, the anchor rods are corroded in rock and soil for a long time to weaken the anchoring performance and reduce the strength, so that certain potential safety hazards are caused to future use and maintenance of engineering.

The traditional anchor rod has more processes during production and use, wastes a lot in material aspect, and is not in accordance with the concept of green environmental protection.

Disclosure of Invention

The invention provides a screw-in grouting anchor rod structure and a using method thereof, aiming at solving the problems of anchor rod reduction caused by long-term corrosion of the anchor rod in rock and soil, complex anchor rod manufacturing and operation and the like in the prior art.

In order to achieve the purpose, the technical scheme of the invention is as follows:

a screw-in grouting anchor rod structure comprises an anchor rod main body, a grouting pipe, a tray and a nut;

one end of the anchor rod main body is provided with a drill bit with threads, the bottom of the drill bit is provided with a round hole with continuously changed curvature, and the other end of the anchor rod main body is connected with a nut through threads;

the anchor rod main body is a hollow steel pipe externally attached with threads.

The two-stage grouting structure is formed by nesting a circular hole reserved at the bottom of a drill bit and a circular steel pipe with continuously changed curvature.

The grouting pipe is a circular steel pipe with continuously changed curvature.

The nut is a high-strength nut.

The use method of the precession type grouting anchor rod structure comprises the following steps:

the method comprises the following steps: the anchor rod is used for performing precession type drilling on a construction working surface, and the depth of a hole is determined according to actual needs and the length of an anchor rod main body;

step two: after the drilling is finished, a grouting pipe at the drill bit part is pushed out by high-pressure grouting at one end of the anchor rod main body to form an external support to form a two-stage grouting structure;

step three: and after grouting is finished, fixing the grouting pipe through the tray and the high-strength nut, and finishing anchoring.

The invention has the beneficial effects that:

according to the screw-in grouting anchor rod structure, the anchor rod main body is driven into a rock-soil body through screw-in punching on a construction working surface, the steel pipe with the curvature continuously changing inside a drill bit is pushed out through high-pressure grouting to form an externally attached support, so that a two-stage grouting structure is formed, the support is fully extruded with the rock-soil body in the opening process to form extrusion resistance and is embedded into the rock-soil body to achieve the effect of preventing falling, grouting is performed through the grouting pipe, and a structural surface is formed outside a rod body, so that the screw-in grouting anchor rod structure achieves the optimal anchoring state, and the stability of the rock-soil body is enhanced; the screw-in grouting anchor rod structure has the advantages that the anchor rod main body is driven into a rock-soil body in a screw-in mode, so that the engineering quantity is reduced, and meanwhile, the anchoring force is greatly improved; the problem of falling is solved to a certain extent by pushing out the support and embedding the rock-soil body through grouting; the screw-in grouting anchor rod structure is easy to construct, strong in anchoring force and simple in structure, and can achieve the best anchoring effect in soft soil and soft rock mass.

Drawings

Fig. 1 is a perspective view of a precession type grouting bolt structure provided by the present invention;

fig. 2 is a schematic elevational view of a precession grouting bolt construction provided by the present invention;

fig. 3 is a cross-sectional view of a two-stage grouting structure of a precession type grouting anchor structure provided by the present invention;

fig. 4 is an elevational view of the present invention prior to anchoring of the precession grouting bolt structure.

Wherein: 1-grouting pipe; 2-limiting holes; 3, reserving a round hole at the bottom of the drill bit; 4-anchor body; 5-a tray; 6-nut.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. In the description of the present invention, it should be noted that the terms "inside", "outside", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The terms "disposed", "connected", and the like, are to be construed broadly and include, for example, "connected", whether fixedly, detachably, or integrally; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In order to solve the problems in the prior art, as shown in fig. 1 to 4, the invention provides a screw-in grouting anchor rod structure, which comprises an anchor rod main body 4, a grouting pipe 1, a tray 5 and a nut 6;

the anchor rod main body 4 is provided with threads, one end of the anchor rod main body is provided with a drill bit with a reserved circular hole 3 and a limiting hole 2, the reserved circular hole 3 at the bottom of the drill bit is connected with the grouting pipe 1 and the limiting hole 2 in a nested manner, and the other end of the drill bit is connected with the tray 5 and the nut 6 through threads;

in this embodiment, as shown in fig. 1, the anchor rod main body 4 is a hollow steel pipe with external threads, the anchor rod main body 4 and the grouting pipe 1 are connected in an embedded manner through the reserved round hole 3 and the limiting hole 2 at the bottom of the drill bit, the other end of the anchor rod main body 4 is connected with the tray 5 and the nut 6 through threads, and the length of the anchor rod main body 4 is determined according to actual engineering requirements.

step three: and after grouting is finished, fixing the grouting material through a tray and a high-strength nut.

Claims

1. A screw-in grouting anchor rod structure is characterized by comprising an anchor rod main body (4), a grouting pipe (1), a tray (5) and a nut (6); the anchor rod main body (4) is provided with threads, one end of the anchor rod main body is provided with a drill bit with a circular hole with curvature continuously changing at the bottom, and the other end of the anchor rod main body (4) is connected with the tray (5) and the nut (6) through the threads; a circular hole (3) is reserved at one end of the drill bit and is connected with the grouting pipe (1) in a nested manner to form a two-stage grouting structure.

2. A precession grouting bolt structure according to claim 1, characterised in that the bolt body (4) is an externally threaded hollow steel tube.

3. A precession grouting anchor structure according to claim 1, characterised in that the two-stage grouting structure consists of a steel tube of continuously varying curvature and a circular hole in the bottom of the drill bit, connected by nesting.

4. A precession type grouting bolt structure according to claim 3, characterized in that the grouting tube (1) is a steel tube with continuously changing curvature, which is a round steel tube.

5. A precession grouting bolt structure according to claim 1, characterised in that the nut (6) is a high strength nut.

6. The method of using a precession grouting bolt structure according to claim 1, comprising the steps of:

step two: after the drilling is finished, a grouting pipe at the drill bit part is pushed out by high-pressure grouting at one end of the anchor rod main body to form a support, so that a two-stage grouting structure is formed;