Anti-spalling blocking bar for large cross-section coal gallery excavation work surface and supporting method

Abstract

Disclosed are an anti-spalling blocking bar for a large cross-section coal gallery excavation work surface and a supporting method. The anti-spalling blocking bar comprises a blocking bar (1) and a support bar (7). Both a top portion of the blocking bar and an end of the support bar are provided with screw holes (2). A steel peg (5) is provided on an outer side of a bottom portion of the blocking bar. Locking teeth (6) is provided on an inner side of a mid-upper portion of the blocking bar, and a locking catch (8) is provided on one end of the support bar. The blocking bar and support bar are secured, using the screw hole and a screw bolt, to a temporary support device. After removing coal, a tool is used to hammer the blocking bar so as to wedge the steel peg thereof into a coalface (13). The locking catch of the support bar is held within the locking teeth to support a coal heading. After use, the blocking bar and support bar can be retrieved and suspended, using a hanging device, from the temporary support device. The anti-spalling blocking bar offers the advantages of easy installation, good support, reusability, convenient storage, and the like. The invention reduces the probability of personnel injury caused by coal loosening and falling from the heading, shortens the time for establishing coal heading support, and enhances a safety index and an excavation speed of a large cross-section coal gallery excavation work surface.

Claims

1. A wall-caving-resistant mining stop bar on a driving face of a large-section coal roadway or an anti-spalling blocking bar for large cross-section coal gallery excavation work surface comprising a stop bar (1) and a support bar (7) matched with the stop bar (1); bolt holes (2) are arranged at top of the stop bar (1) and one end of the support bar (7), a forepoling bar (4) connected at the top of the stop bar, wherein the support bar (7) is connected to the forepoling bar (4) a steel pricker (5) is disposed on the outside of a bottom portion of the stop bar (1), snap teeth (6) are arranged inside middle and upper parts of the stop bar (1), and a claw (8), configured to be stuck in the snap teeth (6), is arranged at other end of the support bar.

2. The bar according to claim 1, characterized in that the steel pricker (5) has a length of 20 cm.

3. A supporting method of a driving face of a large-section coal roadway in the wall-caving-resistant stop bar according to claim 1, characterized in that the method comprises the following steps: 1) fixing the stop bar (1) at front end of a forepoling bar (4) of a temporary supporting device of a driving face roof through coordination between the bolt holes (2) and the bolt (3), and the support bar (7) is fixed in the middle and front part of the forepoling bar (4) through coordination of the bolt holes (2) and the bolt (3); after coal is excavated, a protection mesh (9) is stretched, the stop bar (1) is knocked with a tool so that the steel pricker (5) at lower part thereof wedges into a coal wall (13) on a heading face by pressing the protection mesh (9), and the protection mesh (9) and the coal wall (13) are compacted by the steel pricker; 2) holding the claw (8) of the support bar (7) against the snap teeth (6) of the stop bar (1), and fastening with a tool to realize resistance of wall caving of the heading face; then permanent support is performed by setting an anchor rod (11); 3) after the permanent support is completed, releasing the claw (8) of the support bar (7) from the snap teeth (6) of the stop bar (1) with a tool, and the steel pricker (5) inserted in the coal wall (13) is pulled out; 4) using a hanging device (10) is used to hang the stop bar (1) on the forepoling bar (4), and then next driving cycle is performed.

4. The supporting method of a driving face of a large-section coal roadway according to claim 3, characterized in that a precise number of the wall-caving-resistant stop bars is determined according to surrounding rock status and large and small temporary supporting devices for a heading face section; in an area where the coal wall (13) is unstable, wood plates (12) or steel plates are configured to be arranged between the stop bars (1) as appropriate to increase the stressed area and guarantee the stability of the coal wall (13).

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is the structural diagram of the stop bar the invention;

(2) FIG. 2 is the structural diagram of the support bar of the invention;

(3) FIG. 3 is the side view of the invention in which the stop bar the support bar and the forepoling bar coordinate;

(4) FIG. 4 is the front view of the invention in which the stop bar the support bar and the forepoling bar coordinate.

(5) In the figures, 1 refers to the stop bar, 2 the bolt holes, 3 the bolt, 4 the forepoling bar, 5 the steel pricker, 6 the snap teeth, 7 the support bar, 8 the claw, 9 the protection mesh, 10 the hanging device, 11 the anchor rod, 12 the wood plates and 13 the coal wall.

DETAIL DESCRIPTION OF EMBODIMENTS

(6) The invention will be further explained in combination with the attached drawings.

(7) The wall-caving-resistant mining stop bar on a driving face of a large-section coal roadway of the invention comprises a stop bar 1 and a support bar 7 matched with the stop bar 1.

(8) As shown in FIG. 1, the stop bar 1 is made of a steel channel, a bolt hole 2 is formed at the top of the stop bar 1 which can be connected with a forepoling bar 4 of a temporary supporting device for a driving face roof through a bolt 3, an opening is formed in the steel plate close to the top of the stop bar 1 so that the stop bar 1 can rotate, a steel pricker 5 with a length of 20 cm is arranged outside the bottom of the stop bar 1, and snap teeth 6 are arranged inside the middle and upper parts of the stop bar 1.

(9) As shown in FIG. 2, a bolt hole 2 is formed at one end of the support bar 7 which can be connected with the forepoling bar 4 through a bolt 3, and a claw 8 is arranged at the other end thereof, which can stretch into the snap teeth 6 of the stop bar.

(10) A supporting method of a driving face of a large-section coal roadway according to the above-mentioned wall-caving-resistant stop bar or anti-spalling blocking bar comprises the following steps:

(11) 1) The stop bar 1 is fixed at the front end of the forepoling bar 4 of the temporary supporting device of the driving face roof through coordination between the bolt holes 2 and the bolt 3, and the support bar 7 is fixed in the middle and front part of the forepoling bar 4 through coordination of the bolt holes 2 and the bolt 3; after coal is excavated, a protection mesh 9 is stretched, the stop bar 1 is knocked with a tool so that the steel pricker 5 at the lower part thereof wedges into a coal wall 13 on the heading face by pressing the protection mesh 9; FIGS. 3 and 4 are schematic diagrams in which the wall-caving-resistant stop bar or anti-spalling blocking bar 1 on the driving face of the large-section coal roadway of the invention, the support bar 7 and the forepoling bar 4 coordinate; in the step, the precise number of the wall-caving-resistant stop bars or anti-spalling blocking bars is determined according to the surrounding rock status and the large and small temporary supporting devices for the heading face section; in an area where the coal wall 13 is unstable, wood plates 12 or steel plates can be arranged between the stop bars 1 as appropriate to increase the stressed area and guarantee the stability of the coal wall 13;

(12) 2) The claw 8 of the support bar 7 holds against the snap teeth 6 of the stop bar 1, and is fastened with a tool to realize resistance of wall caving and/or anti-spalling of the heading face; then permanent support is performed by setting an anchor rod 11;

(13) 3) After the permanent support is completed, the claw 8 of the support bar 7 is released from the snap teeth 6 of the stop bar 1 with a tool, and the steel pricker 5 inserted in the coal wall 13 is pulled out;

(14) 4) A hanging device 10 is used to hang the stop bar 1 on the forepoling bar 4, and then the next driving cycle is performed.

(15) The above description is preferred embodiments of the invention only. It shall be pointed out that many improvements and modifications can be made by one of ordinary skill in the technical field without departing from the principle of the invention, which shall also be regarded as falling within the scope of protection of the invention.