CN109098743B

CN109098743B - Mining steel wire bundle

Info

Publication number: CN109098743B
Application number: CN201810949060.6A
Authority: CN
Inventors: 张农; 魏群; 谢正正
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2018-08-20
Filing date: 2018-08-20
Publication date: 2020-12-04
Anticipated expiration: 2038-08-20
Also published as: WO2020037816A1; CN109098743A

Abstract

A mining steel wire bundle is suitable for roof support engineering in coal mine roadway construction. Comprises a steel wire bundle main body, a tray and a nut; the steel wire bundle main body consists of 4 parallel spiral rib steel wires, a thread sleeve and a large spiral sleeve; the threaded sleeve is arranged at the tail part of the parallel spiral rib steel wire and is connected with the tail part of the parallel spiral rib steel wire by strong structural adhesive and welding; the large spiral sleeve is arranged at the front part of the parallel spiral rib steel wire and is connected by welding; the length of the steel wire bundle can be selected according to actual geological conditions of a mine, and the steel wire bundle with enough length can meet the requirement of safe production of a modern mine; each steel wire in the steel wire bundle is uniformly stressed, and stress concentration cannot occur; the large spiral sleeve ensures the full stirring of the resin explosive cartridge and forms a thick-layer anchoring rock beam of the roadway roof. The tail part of the steel wire bundle is provided with a threaded sleeve, so that the installation is convenient and rapid; the tensile strength of the steel wire bundle is higher than that of a common anchor rod, the effective sectional area of the steel wire bundle is smaller under the same breaking load index, the weight is lighter, the cost is lower, and the steel wire bundle has a larger popularization and application value.

Description

Mining steel wire bundle

Technical Field

The invention relates to a steel wire bundle, in particular to a mining steel wire bundle used in roof support engineering in coal mine roadway construction

Background

The roadway is a necessary channel for underground coal mining, and the smooth and stable roadway is the guarantee of safe and efficient mining of the coal mine. According to incomplete statistics, the newly excavated tunnel of a coal mine in China every year is up to 12000km, the anchor rod support of the key coal mine tunnel in China accounts for more than 90%, and the number of consumed anchor rods reaches hundreds of millions.

In the existing anchor bolt support system, the anchor bolts are various in types, including inverted wedge anchor bolts, tube seam anchor bolts, tube expansion anchor bolts, resin anchor bolts, extensible anchor bolts and the like. The most commonly used resin anchor rods at present have the main principle that the deformed steel bar anchor rods are bonded and anchored by resin cartridges or resin injected by pumps, and end part, lengthening or full-length anchoring can be realized. However, the anchor rod belongs to a rigid material and is limited by the height of a roadway and construction operation, and the length of the anchor rod is generally in the range of 2.0 m-2.6 m; meanwhile, the length of the anchor rod is too long, and the cost and the weight of the anchor rod are increased.

At present, coal development of China gradually turns to deep, mining conditions are extremely complex, meanwhile, the mechanization level is greatly improved, required roadway sections are larger and larger, therefore, the anchoring thickness of a roadway top plate is increased, the required anchor rod length is reasonably lengthened, the general roadway with the burial depth of 400 m-800 m is required to be 3.5 m-4.0 m, the roadway height limits the overlong anchor rod, and therefore, a mining supporting material which can meet the length requirement and can be stressed uniformly is urgently required to be developed.

Disclosure of Invention

The technical problem is as follows: aiming at the defects of the technology, the mining steel wire bundle with the length meeting the requirement, uniform stress of the steel wire bundle main body, difficult fracture in use, convenient installation and low cost is provided.

The technical scheme is as follows: in order to achieve the technical purpose, the mining steel wire bundle comprises a steel wire bundle main body, a tray and a nut, wherein the tray and the nut are arranged at the tail part of the steel wire bundle main body, and the mining steel wire bundle is characterized in that: the steel wire bundle main part includes the parallel spiral rib steel wire of stranded, and the anterior top of steel wire bundle main part is equipped with the wedge face, and the anterior part of steel wire bundle main part is equipped with a plurality of big spiral sleeve pipes successively, both ends are equipped with the welding groove a that the symmetry set up respectively around the big spiral sleeve pipe, are equipped with bellied big helical structure in the big spiral sleeve pipe middle section, and the afterbody of steel wire bundle main part is equipped with hollow thread bush, is equipped with a plurality of bonding grooves in the thread bush, and thread bush front portion is equipped with welding groove b, and thread bush afterbody is equipped with the screw thread, and the tray setting is between thread bush's welding groove b and.

The multi-strand parallel spiral rib steel wire is characterized in that 4 parallel spiral rib steel wires are cold-drawn low-carbon steel wires, the length of each spiral rib steel wire is 3500 mm-4200 mm, the diameter of each cold-drawn low-carbon steel wire is 5 mm-8 mm, and the tensile strength of each cold-drawn low-carbon steel wire is not lower than 1680 MPa.

The outer diameter of the large spiral casing is 18-28 mm, the inner diameter is 13-21 mm, and the length is 50-80 mm; the external diameter of the threaded sleeve is 20 mm-30 mm, the internal diameter is 13 mm-21 mm, and the length is 150 mm-300 mm.

The large spiral sleeve is provided with a front welding groove and a rear welding groove which are the same, the width of the welding groove a is 3-5 mm, the width of the welding groove a is 15-25 mm, the width of the welding groove b of the threaded sleeve is 5-7 mm, and the length of the welding groove b is 40-80 mm.

The center of the welding groove b of the threaded sleeve is respectively positioned at the groove between two adjacent parallel spiral rib steel wires, the welding area is effectively increased, the welding is more firm, and the front and rear welding grooves a of the large spiral sleeve are positioned at the groove between two adjacent parallel spiral rib steel wires.

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

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

The threaded sleeve is connected to the tail part of the spiral rib steel wire by strong structural adhesive and welding; the number of the large spiral sleeves is 3-5 in the front of the parallel spiral rib steel wire in welded connection, and the two large spiral sleeves are arranged at an interval of 100-150 mm.

A construction method of a mining steel wire bundle comprises the following steps:

step a: according to the scheme, steel wire bundle drilling is carried out on the top plate of the roadway, the diameter of the drilled hole is 32-36 mm, and the length of the drilled hole is 150-300 mm shorter than that of the steel wire bundle;

step b: the resin cartridge is placed at the orifice of the drill hole, and then the front part of the steel wire bundle is pushed into the bottom of the drill hole by the top, the steel wire bundle is pushed forwards by the rotation of the anchor rod drilling machine, the resin cartridge is broken by utilizing the wedge-shaped surface at the front part of the steel wire bundle, and the resin cartridge is fully stirred by utilizing the large spiral structure, so that the bonding and anchoring effects of the resin cartridge are greatly exerted;

step c: applying pretightening force on a threaded sleeve (5) at the tail part of the steel wire bundle main body (1) by using a nut (3), wherein the pretightening force is 60 kN-90 kN;

step d: in order to prevent the anchoring force of the steel wire bundle from loosening, after all the steel wire bundles are constructed on the same day, returning to perform secondary pre-tightening on the steel wire bundle constructed on the same day, wherein the secondary pre-tightening force is not lower than 80 kN.

Has the advantages that: due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:

(1) the mining steel wire bundle consists of 4 parallel multi-strand parallel spiral rib steel wires, the length can be selected according to the actual geological conditions of a mine, the defect that the length of an anchor rod is limited by the height of a roadway is overcome, and meanwhile, the overall strength of the steel wire bundle is higher than that of the anchor rod, so that a thick-layer anchoring rock beam of a roadway top plate can be formed, and the safety of the roadway top plate is ensured;

(2) the mining steel wire bundle is composed of 4 parallel spiral rib steel wires which are arranged side by side in pairs, each plurality of parallel spiral rib steel wires are stressed uniformly, and in a stressed state, the plurality of parallel spiral rib steel wires cannot be scattered and stressed uniformly, stress concentration cannot occur, fracture and damage of the steel wires caused by the influence of dynamic pressure on a roadway are avoided, and personal and property safety of miners is ensured;

(3) the front part of the mining steel wire bundle is provided with a plurality of large threaded sleeves, the large threaded sleeves are of a left-handed double-line large spiral structure, and the front part of the steel wire is a wedge-shaped surface, so that the resin cartridges can be fully stirred, the bonding and anchoring effects of the resin cartridges can be greatly exerted, a thick-layer anchoring rock beam of a roadway top plate can be formed, and the safety of the roadway top plate can be ensured;

(4) the tail part of the mining steel wire bundle is provided with the threaded sleeve, so that pre-tightening force can be applied through the nut, and the mounting is convenient and quick;

(5) the groove between two adjacent parallel spiral rib steel wires in the welding groove is welded, so that the welding area is increased, the steel wires and the threaded sleeve are bonded at the bonding groove by using the powerful structural adhesive, the firmness of the threaded sleeve is increased, and the mining steel wire bundle can be ensured to apply larger pretightening force.

Drawings

Fig. 1 is an overall schematic view of a mining tendon of the present invention.

Fig. 2 is a partially enlarged view of the mining tendon of the present invention.

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

Fig. 4 is a cross-sectional view of the mining tendon threaded bushing of the present invention.

Fig. 5 is a schematic view of a large spiral casing of the present invention.

Fig. 6 is a schematic view of a threaded bushing of the present invention.

FIG. 7 is a cross-sectional view of the threaded sleeve of the present invention.

In the figure: 1. a tendon body; 2. a tray; 3. a nut; 4. a large spiral casing; 4-1, welding groove a; 4-2, large spiral structure; 5. a threaded bushing; 5-1, welding groove b; 5-2, screw thread; 5-3, and a bonding groove.

Detailed Description

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

as shown in fig. 1 and 2, the mining steel wire bundle of the present invention comprises a steel wire bundle body 1, a tray 2 and a nut 3, wherein the tray 2 and the nut 3 are arranged at the tail part, and the mining steel wire bundle is characterized in that: the steel wire bundle main body 1 comprises a plurality of strands of parallel spiral rib steel wires, the plurality of strands of parallel spiral rib steel wires are cold-drawn low-carbon steel wires with 4 parallel spiral rib steel wires, the length of each spiral rib steel wire is 3500 mm-4200 mm, the diameter of each cold-drawn low-carbon steel wire is 5 mm-8 mm, the tensile strength of each cold-drawn low-carbon steel wire is not lower than 1680MPa, the top end of the front part of the steel wire bundle main body 1 is provided with a wedge surface, the front part of the steel wire bundle main body 1 is sequentially provided with a plurality of large spiral sleeves 4, as shown in figure 3, each large spiral sleeve 4 is of a left-hand double-line large spiral structure, the width of a bonding groove in each large spiral sleeve 4 is 3 mm-5 mm, the diameter of the bonding groove is 1 mm-2 mm larger than the inner diameter of the spiral sleeve, the interval of the bonding grooves is 6 mm-8 mm, as shown in figure 5, the front end and the rear end of, the width of the welding groove a4-1 is 15 mm-25 mm, as shown in fig. 6 and 7, the width of the welding groove b5-1 of the threaded sleeve 5 is 5 mm-7 mm, the length of the welding groove b5-1 is 40 mm-80 mm, a convex large spiral structure 4-2 is arranged on the middle section of the large spiral sleeve 4, the outer diameter of the large spiral sleeve 4 is 18 mm-28 mm, the inner diameter is 13 mm-21 mm, and the length is 50 mm-80 mm; the external diameter of the threaded sleeve 5 is 20 mm-30 mm, the internal diameter is 13 mm-21 mm, the length is 150 mm-300 mm, as shown in fig. 5, the tail of the tendon body 1 is provided with a hollow threaded sleeve 5, the threaded sleeve 5 is provided with a plurality of bonding grooves 5-3, the front of the threaded sleeve 5 is provided with a welding groove b5-1, the centers of the welding grooves b5-1 of the threaded sleeve 5 are respectively positioned at the grooves between two adjacent parallel spiral rib steel wires, so that the welding area is effectively increased, the welding is firmer, the front and rear welding grooves a4-1 of the large spiral sleeve 4 are positioned at the groove between two adjacent parallel spiral rib steel wires, the tail part of the spiral sleeve 5 is provided with a thread 5-2, the tray 2 is arranged between the welding groove b5-1 and the thread 5-2 of the spiral sleeve 5, the nut 3 is arranged on the thread 5-2, and the spiral sleeve 5 is connected with the tail part of the spiral rib steel wire by strong structural adhesive in a welding way; the number of the large spiral sleeves 4 is 3-5 in the front of the parallel spiral rib steel wire in welded connection, and the two large spiral sleeves 4 are arranged at an interval of 100-150 mm.

Claims

1. The utility model provides a mining steel wire bundle, includes steel wire bundle main part (1) and sets up tray (2) and nut (3) at the afterbody, its characterized in that: the steel wire bundle main body (1) comprises a plurality of strands of parallel spiral ribbed steel wires, a wedge-shaped surface is arranged at the top end of the head of the steel wire bundle main body (1), a plurality of large spiral sleeves (4) are sequentially arranged at the head part of the steel wire bundle main body (1), welding grooves a (4-1) which are symmetrically arranged are respectively arranged at the front end and the rear end of each large spiral sleeve (4), a convex large spiral structure (4-2) is arranged on the middle section of each large spiral sleeve (4), a hollow threaded sleeve (5) is arranged at the tail part of the steel wire bundle main body (1), a plurality of bonding grooves (5-3) are arranged in each threaded sleeve (5), a welding groove b (5-1) is arranged at the head part of each threaded sleeve (5), a thread (5-2) is arranged at the tail part of each threaded sleeve (5), and a tray (2) is arranged between the welding groove b, the nut (3) is arranged on the thread (5-2); the centers of the welding grooves b (5-1) of the threaded sleeve (5) are respectively positioned at the grooves between two adjacent parallel spiral rib steel wires, so that the welding area is effectively increased, the welding is firmer, and the front and rear welding grooves a (4-1) of the large spiral sleeve (4) are positioned at the grooves between two adjacent parallel spiral rib steel wires; the large spiral sleeve (4) is of a left-handed double-line large spiral structure;

the construction method of the mining steel wire bundle comprises the following steps:

step a: according to the scheme, steel wire bundle drilling is carried out on the top plate of the roadway, the diameter of the drilled hole is 32 mm-36 mm, and the length of the drilled hole is 150 mm-300 mm shorter than that of the steel wire bundle;

step b: the resin cartridge is placed at the orifice of the drill hole, and then the steel wire bundle is pushed to the bottom of the drill hole by the top of the steel wire bundle, the steel wire bundle is pushed forwards by the rotation of the anchor rod drilling machine, the wedge-shaped surface at the front part of the steel wire bundle and the large spiral sleeve are utilized to ensure the full stirring of the resin cartridge, and the bonding and anchoring effects of the resin cartridge are greatly exerted;

step c: applying a pre-tightening force on a threaded sleeve (5) at the tail of the steel wire bundle main body (1) by using a nut (3), wherein the pre-tightening force is 60 kN-90 kN;

2. The mining tendon according to claim 1, characterized in that: the multi-strand parallel spiral rib steel wire is 4 parallel spiral rib steel wires and is a cold-drawn low-carbon steel wire, the length of the spiral rib steel wire is 3500 mm-4200 mm, the diameter of the cold-drawn low-carbon steel wire is 5 mm-8 mm, and the tensile strength of the cold-drawn low-carbon steel wire is not lower than 1680 MPa.

3. The mining tendon according to claim 1, characterized in that: the outer diameter of the large spiral sleeve (4) is 18 mm-28 mm, the inner diameter is 13 mm-21 mm, and the length is 50 mm-80 mm; the outer diameter of the threaded sleeve (5) is 20 mm-30 mm, the inner diameter is 13 mm-21 mm, and the length is 150 mm-300 mm.

4. The mining tendon according to claim 3, characterized in that: the width of the welding groove a (4-1) is 3 mm-5 mm, the length of the welding groove a (4-1) is 15 mm-25 mm, the width of the welding groove b (5-1) of the threaded sleeve (5) is 5 mm-7 mm, and the length of the welding groove b (5-1) is 40 mm-80 mm.

5. The mining tendon according to claim 4, characterized in that: the width of the bonding groove in the threaded sleeve (5) is 3 mm-5 mm, the diameter of the bonding groove is 1 mm-2 mm larger than the inner diameter of the threaded sleeve, and the interval between the bonding grooves is 6 mm-8 mm.

6. The mining tendon according to claim 1, characterized in that: the threaded sleeve (5) is connected to the tail part of the spiral rib steel wire by strong structural adhesive and welding; big spiral sleeve pipe (4) welded connection sets up 3~5 in the front end of parallel spiral rib steel wire, and two big spiral sleeve pipes (4) interval 100mm ~150mm set up.