WO2020037816A1

WO2020037816A1 - Steel wire bundle for mines

Info

Publication number: WO2020037816A1
Application number: PCT/CN2018/112376
Authority: WO
Inventors: 张农; 魏群; 谢正正
Original assignee: 中国矿业大学
Priority date: 2018-08-20
Filing date: 2018-10-29
Publication date: 2020-02-27
Also published as: CN109098743A; CN109098743B

Abstract

A steel wire bundle for mines, which is suitable for roof support engineering during the construction of a coal mine well lane, comprising a steel wire bundle main body (1), a tray (2) and a nut (3). The steel wire bundle main body (1) consists of four parallel spiral rib steel wires, a threaded sleeve tube (5) connected to tail ends of the parallel spiral rib steel wires by means of strong structural glue and welding, and a large spiral sleeve tube (4) connected to front ends of the parallel spiral rib steel wires by means of welding. The length of the steel wire bundle may be selected according to the actual geological conditions of a mine well so as to meet requirements for safe production; each steel wire in the steel wire bundle is uniformly stressed such that stress concentration will not occur, and the tensile strength of the steel wire bundle is higher than that of ordinary anchor rods; the large spiral sleeve tube (4) ensures that a resin capsule is fully stirred and forms a thick layer anchored rock beam on a laneway roof; and the threaded sleeve tube (5) ensures quick and easy installation.

Description

New type steel wire harness

Technical field

The invention relates to a steel wire bundle, which is especially suitable for a new type of steel wire bundle used in roof support engineering in the construction of a mine shaft.

Background technique

The roadway is a necessary channel for the mining of coal mines. The smooth and stable roadway is the guarantee for safe and efficient mining of coal mines. According to incomplete statistics, the total number of newly excavated roadways in China's state-owned coal mines each year is 12,000km, and more than 90% are supported by bolts in state-owned key coal mines. The number of anchors consumed each year reaches hundreds of millions.

In the existing anchor support system, there are many types of anchors, including inverted wedge anchors, pipe-slot anchors, expanded-pipe anchors, resin anchors, extensible anchors, and the like. Resin anchors are the most commonly used now. The main principle is that the rebar anchors are bonded and anchored by resin rolls or pumped resin, which can achieve end, lengthening or full length anchoring. However, the anchor is a rigid material and is restricted by the height of the roadway and the construction operation. The length of the anchor is generally in the range of 2.0m to 2.6m. At the same time, the length of the anchor is too long, which will increase the cost and weight of the anchor.

At present, the development of coal in our country is gradually turning to the deep, and the mining conditions are extremely complicated. At the same time, the mechanization level has been greatly increased, and the required cross section of the roadway is getting larger and larger. Therefore, the thickness of the roadway roof anchorage should also be increased, and the length of the required anchor rod should be increased. Generally, in the roadway with a buried depth of 400m to 800m, the length of the anchor rod should be 3.5m to 4.0m. The height of the roadway restricts the length of the anchor rod. Therefore, it is urgent to develop a mine support that can meet the length requirements and can be uniformly stressed. material.

Summary of the Invention

Technical problem: In view of the shortcomings of the above technology, a new type of steel wire harness for mining is provided that meets the requirements of length, the main force of the wire harness is uniform, is not easy to break during use, is easy to install, and has low cost.

Technical solution: In order to achieve the above technical objective, a new type of steel wire harness for mining according to the present invention includes a wire harness main body and a tray and a nut arranged at the tail, which are characterized in that the wire harness main body includes a plurality of parallel spiral rib steel wires, and the wire harness The front end of the main body is provided with a wedge-shaped surface, and the front part of the main body of the wire harness is provided with a plurality of large spiral sleeves. The front and back ends of the large spiral sleeve are provided with welding grooves a symmetrically arranged on the middle portion of the large spiral sleeve. It is provided with a large convex spiral structure. The tail of the wire harness main body is provided with a hollow threaded sleeve. The threaded sleeve is provided with a plurality of bonding grooves. The front of the threaded sleeve is provided with a welding groove b. Thread, the tray is arranged between the welding groove b of the threaded sleeve and the thread, and the nut is arranged on the thread.

The multi-stranded parallel spiral rib steel wire is 4 parallel spiral rib steel wires which are cold drawn low carbon steel wires, the length of the spiral rib steel wires is 3500 mm to 4200 mm, the diameter of the cold drawn low carbon steel wires is 5 mm to 8 mm, and the cold drawn low carbon steel wires are tensile resistant The strength is not less than 1680MPa.

The large spiral sleeve has an outer diameter of 18 mm to 28 mm, an inner diameter of 13 mm to 21 mm, and a length of 50 mm to 80 mm; a threaded sleeve has an outer diameter of 20 mm to 30 mm, an inner diameter of 13 mm to 21 mm, and a length of 150 mm to 300 mm.

The large spiral casing has two identical welding grooves in the front and rear. The width of the welding groove a is 3 mm to 5 mm, the width of the welding groove a is 15 mm to 25 mm, and the width of the welding groove b of the threaded sleeve is 5 mm to 7 mm. The welding groove b has a length of 40 mm to 80 mm.

The centers of the welding grooves b of the threaded sleeves are respectively located at the grooves between two adjacent parallel spiral rib steel wires, which effectively increases the welding area and makes the welding more reliable. A groove between two adjacent parallel spiral rib steel wires.

The large spiral casing is a left-handed double-line large spiral structure.

The width of the bonding groove in the large-threaded sleeve is 3 mm to 5 mm, the diameter of the bonding groove is 1 mm to 2 mm larger than the internal diameter of the threaded sleeve, and the interval between the bonding grooves is 6 mm to 8 mm.

The threaded sleeve is connected to the tail of the spiral rib steel wire with a strong structural adhesive and welding; the large spiral sleeve is provided at the front of the parallel spiral rib steel wire by welding, and 3 to 5 are arranged, and the two large spiral sleeves are arranged at a distance of 100 mm to 150 mm. .

The construction method of a new type of steel wire harness is as follows:

Step a: According to the plan, drill a steel wire harness on the roof of the roadway. The diameter of the drill hole is 32mm ~ 36mm, and the length of the hole is 150mm ~ 300mm shorter than the length of the wire harness.

Step b: Put the resin medicine roll at the hole of the drilling hole, and then push the bottom of the hole from the front of the wire bundle. The wire bundle is propelled forward by the rotation of the anchor drill, and the wedge surface of the front of the wire bundle is used to break the resin medicine roll. , And then use the large spiral structure to fully stir the resin medicinal roll, which greatly exerts the adhesive anchoring effect of the resin medicinal roll;

Step c: using a nut (3) to apply a pre-tensioning force on the threaded sleeve (5) at the tail of the wire harness body (1), the pre-tensioning force being 60 kN to 90 kN;

Step d: In order to prevent the anchoring force of the steel wire bundle from slackening, after all the steel wire bundles are constructed on the day, return and re-prestress the steel wire bundles that have been constructed that day. The secondary pre-tensioning force is not less than 80kN.

Beneficial effect: As a result of adopting the above technical solution, the present invention has the following advantages compared with the prior art:

(1) The steel wire harness for mining of the present invention is composed of 4 parallel multiple strands of parallel spiral rib steel wires, and the length can be selected according to the actual geological conditions of the mine, which overcomes the disadvantages of the length of the anchor bolt being limited by the height of the roadway, and the whole of the wire harness The strength is higher than the strength of the anchor rod, which can form a thick layer of anchored rock beams on the roof of the roadway and ensure the safety of the roof of the roadway;

(2) The steel wire bundle for mining of the present invention is composed of 4 parallel spiral rib steel wires arranged side by side. Each of the multiple parallel spiral rib steel wires is uniformly stressed. The space will not spread, the force will be uniform, and no stress concentration will occur, which avoids the fracture and damage of the steel wire caused by the dynamic pressure of the roadway, and ensures the safety of the miners' personal property;

(3) The front part of the steel wire bundle for mining according to the present invention is provided with a plurality of large threaded sleeves, the large spiral sleeve is a left-handed double-line large spiral structure, and the front portion of the steel wire is a wedge-shaped surface, which can ensure sufficient stirring of the resin roll. Greatly play the role of bonding and anchoring of resin medicine rolls, which can form a thick layer of anchored rock beams on the roof of the roadway, ensuring the safety of the roof of the roadway;

(4) The tail of the steel wire harness of the present invention is provided with a threaded sleeve, and a pre-tightening force can be applied by a nut, which is convenient and quick to install;

(5) By welding at the groove between two adjacent parallel spiral rib steel wires in the welding groove, the welding area is increased, and a strong structural adhesive is used to bond the steel wire and the threaded sleeve at the bonding groove to increase The robustness of the threaded sleeve can ensure that the steel wire bundle for mining uses a large pre-tensioning force.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an overall schematic view of a steel wire bundle for mining according to the present invention.

FIG. 2 is a partially enlarged view of a steel wire bundle for mining according to the present invention.

Fig. 3 is a sectional view of a large spiral casing of a steel wire bundle for mining according to the present invention.

Fig. 4 is a sectional view of a threaded casing of a steel wire harness for mining according to the present invention.

FIG. 5 is a schematic view of a large spiral sleeve according to the present invention.

Fig. 6 is a schematic view of a threaded sleeve according to the present invention.

Fig. 7 is a sectional view of a threaded sleeve according to the present invention.

In the picture: 1. The main body of the wire harness; 2. The tray; 3. The nut; 4. The large spiral casing; 4-1. The welding groove a; 4 2. The large spiral structure; 5. The threaded casing; 5-1. Welding groove b; 5-2, thread; 5-3, bonding groove.

detailed description

An embodiment of the present invention is further described below with reference to the accompanying drawings:

As shown in FIG. 1 and FIG. 2, the new type of steel wire harness for mining according to the present invention includes a wire harness main body 1 and a tray 2 and a nut 3 provided at the tail, which are characterized in that the wire harness main body 1 includes a plurality of parallel spiral rib steel wires, The multi-stranded parallel spiral rib steel wire is 4 parallel spiral rib steel wires which are cold drawn low carbon steel wires, the length of the spiral rib steel wires is 3500 mm to 4200 mm, the diameter of the cold drawn low carbon steel wires is 5 mm to 8 mm, and the cold drawn low carbon steel wires are tensile resistant The strength is not less than 1680 MPa. The top end of the front part of the wire harness main body 1 is provided with a wedge-shaped surface. The front part of the wire harness main body 1 is provided with a plurality of large spiral sleeves 4, as shown in FIG. It is a left-handed double-line large spiral structure. The width of the bonding grooves in the large-threaded sleeve 4 is 3 mm to 5 mm. The diameter of the bonding grooves is 1 mm to 2 mm larger than the inner diameter of the threaded sleeve. The spacing between the bonding grooves is 6 mm to 8 mm. The front and back ends of the large spiral sleeve 4 are respectively provided with welding grooves a4-1 symmetrically arranged. The width of the welding groove a4-1 is 3mm to 5mm, and the width of the welding groove a4-1 is 15mm to 25mm, as shown in FIG. 6 and FIG. As shown in FIG. 7, the width of the welding groove b5-1 of the threaded sleeve 5 is 5 mm to 7 mm, and the length of the welding groove b5-1 is 40 mm to 80 mm. The middle part of the large spiral casing 4 is provided with a convex large spiral structure 4-2. The large spiral casing 4 has an outer diameter of 18 mm to 28 mm, an inner diameter of 13 mm to 21 mm, and a length of 50 mm to 80 mm. 5 The outer diameter is 20mm ~ 30mm, the inner diameter is 13mm ~ 21mm, and the length is 150mm ~ 300mm. As shown in Figure 5, the tail of the wire harness main body 1 is provided with a hollow threaded sleeve 5, and a plurality of threaded sleeves 5 are provided therein. Adhesive groove 5-3, a welding groove b5-1 is provided at the front of the threaded sleeve 5, the grooves of the welding groove b5-1 of the threaded sleeve 5 are respectively located at the grooves between two adjacent parallel spiral rib steel wires In this way, the welding area is effectively increased to make the welding more reliable. The front and rear welding grooves a4-1 of the large spiral casing 4 are located in the groove between two adjacent parallel spiral rib steel wires, and the tail of the threaded casing 5 is provided with a thread. 5-2, the tray 2 is provided between the welding groove b5-1 of the threaded sleeve 5 and the thread 5-2, the nut 3 is provided on the thread 5-2, and the threaded sleeve 5 is connected to the spiral rib with strong structural glue and welding The tail of the steel wire; 3 to 5 large spiral sleeves 4 are arranged at the front of the welded parallel spiral rib steel wire. Two large spiral sleeves 4 are arranged at a distance of 100mm to 150mm. .

The construction method of a new type of steel wire harness is as follows:

Claims

A new type of steel wire harness for mining includes a wire harness main body (1), a tray (2) and a nut (3) provided at the tail, and is characterized in that the wire harness main body (1) includes a plurality of parallel spiral rib steel wires, and a wire harness. The front end of the main body (1) is provided with a wedge-shaped surface, and the front part of the wire harness main body (1) is provided with a plurality of large spiral sleeves (4), and the large spiral sleeve (4) is provided with symmetrical front and rear ends respectively. The provided welding groove a (4-1), a large spiral structure (4-2) is provided on the middle section of the large spiral sleeve (4), and a hollow threaded sleeve ( 5), a plurality of bonding grooves (5-3) are provided in the threaded sleeve (5), a welding groove b (5-1) is provided in the front portion of the threaded sleeve (5), and a tail portion of the threaded sleeve (5) is provided There are threads (5-2), the tray (2) is set between the welding groove b (5-1) of the threaded sleeve (5) and the thread (5-2), and the nut (3) is set at the thread (5-2 )on.
The new type of steel wire bundle for mining according to claim 1, characterized in that: the plurality of parallel spiral rib steel wires are four parallel spiral rib steel wires are cold-drawn low carbon steel wires, and the length of the spiral rib steel wires is 3500 mm to 4200 mm. The diameter of the drawn low carbon steel wire is 5mm ~ 8mm, and the tensile strength of the cold drawn low carbon steel wire is not less than 1680MPa.
The new type of steel wire harness for mining according to claim 1, characterized in that: the large spiral casing (4) has an outer diameter of 18 mm to 28 mm, an inner diameter of 13 mm to 21 mm, and a length of 50 mm to 80 mm; 5) The outer diameter is 20mm ~ 30mm, the inner diameter is 13mm ~ 21mm, and the length is 150mm ~ 300mm.
The new type of steel wire harness for mining according to claim 3, characterized in that the welding groove a (4-1) of the large spiral casing (4) has a width of 3 mm to 5 mm and the welding groove a (4-1) The width is 15 mm to 25 mm. The width of the welding groove b (5-1) of the threaded sleeve (5) is 5 mm to 7 mm, and the length of the welding groove b (5-1) is 40 mm to 80 mm.
The new type of steel wire bundle for mining according to claim 4, characterized in that the centers of the welding grooves b (5-1) of the threaded sleeve (5) are respectively located in the recesses between two adjacent parallel spiral rib steel wires. At the groove, the welding area is effectively increased to make the welding more reliable. The front and rear welding grooves a (4-1) of the large spiral casing (4) are located at the groove between two adjacent parallel spiral rib steel wires.
The new type of steel wire bundle for mining according to claim 4, characterized in that the large spiral casing (4) has a left-handed double-line large spiral structure.
The new type steel wire harness for mining according to claim 4, characterized in that: the width of the bonding groove in the large-threaded casing is 3 mm to 5 mm, the diameter of the bonding groove is 1 mm to 2 mm larger than the internal diameter of the threaded casing, and the bonding groove The pitch is 6mm ~ 8mm.
The new type of steel wire bundle for mining according to claim 1, characterized in that: the threaded casing (5) is connected to the tail of the spiral rib steel wire with a strong structural adhesive and welding; the large spiral casing (4) is connected to the parallel spiral rib by welding The front part of the steel wire is provided with 3 to 5, two large spiral sleeves (4) are arranged at a distance of 100 mm to 150 mm.
A construction method using the new type steel wire harness for mining according to claim 1, characterized in that the steps are as follows:

Step a: According to the plan, drill a steel wire harness on the roof of the roadway. The diameter of the drill hole is 32mm ~ 36mm, and the length of the hole is 150mm ~ 300mm shorter than the length of the wire harness.

Step b: Put the resin medicine roll at the hole of the drilling hole, and then push the bottom of the hole from the front of the wire bundle. The wire bundle is propelled forward by the rotation of the anchor drill, and the wedge surface of the front of the wire bundle is used to break the resin medicine roll. , And then use the large spiral structure to fully stir the resin medicinal roll, which greatly exerts the adhesive anchoring effect of the resin medicinal roll;

Step c: using a nut (3) to apply a pre-tensioning force on the threaded sleeve (5) at the tail of the wire harness body (1), the pre-tensioning force being 60 kN to 90 kN;

Step d: In order to prevent the anchoring force of the steel wire bundle from slackening, after all the steel wire bundles are constructed on the day, return and re-prestress the steel wire bundles that have been constructed that day. The secondary pre-tensioning force is not less than 80kN.