Anchored beam support structure for roadway roof under coal pillar left in extremely close distance goaf

Abstract

The utility model discloses an extremely close distance goaf left coal pillar underlying roadway roof anchor cable beam support structure belongs to coal mine roadway support technical field. The roof anchor cable beam support structure includes: transverse anchor cable beam, longitudinal anchor cable beam and transverse wood backplate. Through the up and down superposition of transverse anchor cable beam and longitudinal anchor cable beam, the stability of the extremely thin rock layer interval underlying mining roadway roof under the extremely close distance goaf left coal pillar is improved obviously, and the technical problem of the extremely close distance goaf left coal pillar underlying roadway roof support is solved effectively, which provides technical guarantee for the safe mining of underlying coal seam under the extremely close distance goaf left coal pillar.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine roadway support technology, specifically relating to an anchor cable beam support structure for the roof of a roadway under a coal pillar left in a goaf at a very close distance. Background Technology

[0002] When mining closely spaced coal seams, especially those with an interlayer spacing of less than 2 meters, the coal pillars left over from the overlying goaf will act as vertical stress concentrations on the thin roof strata of the underlying mining roadway. If the support measures are inadequate, it can easily lead to a major safety accident such as roof collapse in the mining roadway. Therefore, practical engineering urgently requires a scientific and effective roof support structure to improve the stability of the roof of the underlying mining roadway under the action of the coal pillars left over from the overlying closely spaced coal seams, and to eliminate the major safety hazard of roof collapse in the mining roadway. Summary of the Invention

[0003] The purpose of this utility model is to provide a cable-stayed support structure for the roof of a roadway under a coal pillar left in a very close-range goaf, so as to solve the problems existing in the above-mentioned engineering background.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A cable-stayed roof support structure for roadways under coal pillars remaining in extremely close-range goaf areas includes: transverse cable-stayed beams, longitudinal cable-stayed beams, and transverse wooden backing boards;

[0006] Both the transverse and longitudinal anchor beams are composed of any type of steel, such as I-beams, U-beams, channel steel, or W-beam strips, anchor cables, and anchor cable lock bodies.

[0007] The transverse anchor beams are arranged along the roadway span direction, that is, perpendicular to the roadway direction, and are close to the roadway roof surface according to the design spacing. The steel of each transverse anchor beam has anchor holes opened at the design spacing. The anchor cable passes vertically through the anchor hole and the thin-spacing rock layer and is anchored to the coal pillar left in the overlying goaf. The anchor cable with pre-tightening force is locked by the anchor cable lock body.

[0008] The transverse wooden backboards are arranged parallel to each other between two adjacent transverse anchor cable beams, closely attached to the surface of the tunnel roof along the tunnel span direction.

[0009] The longitudinal anchor cable beams are arranged along the roadway direction at the designed column spacing, closely attached to the lower surface of the steel section of the transverse anchor cable beam and the transverse wooden backing plate. Each longitudinal anchor cable beam has an anchor cable opening at the designed spacing. The anchor cable passes vertically through the anchor cable opening, the transverse wooden backing plate and the thin-spacing rock layer and is anchored to the coal pillar left in the overlying goaf. The anchor cable with pre-tightening force is locked by the anchor cable lock body.

[0010] The anchor cable lock body consists of an anchor cable lock and a steel pad or anchor cable tray with a central opening. When the steel sections of the transverse anchor cable beam and the longitudinal anchor cable beam are I-beams or channel steel, a steel pad with a central opening is used instead of an anchor cable tray.

[0011] The beneficial effects of this utility model are:

[0012] This utility model uses H-beams, U-shaped steel, channel steel, W-shaped steel strips, and other steel sections as protective components. Together with prestressed anchor cables anchored in the coal pillars left over from the goaf directly above the mining roadway, it forms an active support truss structure with strong protective capabilities. Furthermore, by superimposing transverse and longitudinal anchor cable beams, the protective capability and active support effect of the single-direction anchor cable beam truss structure are greatly improved. This significantly enhances the stability of the roof of the underlying mining roadway under extremely thin rock strata spacing conditions under the action of the coal pillars left over from the goaf, providing technical assurance for the safe mining of the underlying coal seam under the action of the coal pillars left over from the goaf in extremely close proximity to the coal seam. Attached Figure Description

[0013] Figure 1 A schematic diagram of the overhead cable beam support structure for the roof of a roadway under a coal pillar remaining in a goaf in a very close distance, provided for an embodiment of this utility model;

[0014] Figure 2 A front view schematic diagram of a top slab anchor cable beam support structure provided in this embodiment of the utility model;

[0015] Figure 3 A side view of a top slab anchor cable beam support structure provided for an embodiment of this utility model;

[0016] Figure 4 This is a structural schematic diagram of a steel anchor cable lock body provided in an embodiment of the present utility model;

[0017] Figure 5 This is a schematic diagram of a steel pad with a central hole in the steel anchor cable lock body, provided as an embodiment of the present invention.

[0018] In the diagram: 1. Transverse anchor beam, 2. Longitudinal anchor beam, 3. Transverse steel section, 4. Longitudinal steel section, 5. Transverse wooden backing board, 6. Anchor lock body, 7. Anchor lock, 8. Steel pad with central opening, 9. Anchor cable, 10. Anchor cable opening. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but this does not constitute any limitation on the present invention.

[0020] like Figures 1-5As shown, a cable-stayed roof support structure for a roadway under a coal pillar remaining in a very close-proximity goaf includes a transverse cable-stayed beam 1, a longitudinal cable-stayed beam 2, and a transverse wooden backing plate 5. Both the transverse cable-stayed beam 1 and the longitudinal cable-stayed beam 2 are composed of any type of steel 3 (or 4) such as I-beams, U-shaped steel, channel steel, or W-shaped steel strips, anchor cables 9, and anchor cable locking bodies 6. First, a row of anchor cable holes corresponding to the anchor cable openings 10 on the transverse steel 3 is drilled according to the design, closely following the roadway excavation face. Second, the transverse steel 3 is laid along the roadway span... The direction, i.e., perpendicular to the roadway direction, is aligned with the anchor cable opening 10 and the anchor cable borehole. The transverse steel section 3 is then arranged tightly against the roadway roof surface. Next, the anchor cable 9 is vertically passed through the anchor cable opening 10 and the thin-spacing rock strata and anchored into the coal pillar left over from the overlying goaf. The pre-tensioned anchor cable 9 is locked by the anchor cable locking body 6, thus forming a row of transverse anchor cable beams 1. The above process is repeated immediately following the roadway excavation face, thereby forming a multi-row transverse anchor cable beam truss structure support system. The transverse anchor cables along the roadway direction... After the beams reach a certain number of rows, firstly, between two adjacent transverse anchor steel beams 1, transverse wooden backing boards 5 are arranged parallel to the transverse steel beams 3 and close to the surface of the roadway roof. Secondly, longitudinal steel beams 4 are arranged along the roadway direction, close to the lower surface of the transverse anchor steel beams 3 and transverse wooden backing boards 5 according to the designed row spacing, and after being fixed with single-unit supports, anchor holes corresponding to the anchor openings 10 on the longitudinal steel beams 4 are drilled. Then, anchor cables 9 are vertically passed through the anchor openings 10 and the thin-spacing rock strata and anchored to the overlying mining area. Within the coal pillar left in the void, the anchor cable 9, with pre-tensioned force, is locked by the anchor cable locking body 6, thus forming a longitudinal anchor cable beam 2. The above process is repeated to eventually form a transverse and longitudinal superimposed anchor cable beam truss structure support system. In this embodiment, the transverse and longitudinal steel sections 3 or 4 are selected as I-beams, and the corresponding anchor cable locking body 6 is composed of anchor cable locking devices 7 and steel pads 8 with central openings. If the transverse and longitudinal steel sections 3 or 4 are selected as U-shaped steel or W-shaped steel strips, then the anchor cable locking body 6 is composed of anchor cable locking devices 7 and anchor cable trays.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cable-stayed beam support structure for the roof of a roadway under a coal pillar remaining in a very close-range goaf, characterized in that, include: The system consists of transverse anchor beams, longitudinal anchor beams, and transverse wooden backing plates. The transverse anchor beams are arranged along the roadway span direction, i.e., perpendicular to the roadway direction, at the designed row spacing, close to the surface of the roadway roof. Each transverse anchor beam has anchor holes at the designed spacing in its steel section. The anchor cables pass vertically through the anchor holes and thin-spacing rock strata to anchor into the coal pillar remaining in the overlying goaf. Anchor cables with pre-tension are locked in place by anchor cable lock bodies. The transverse wooden backing plates are arranged parallel to each other along the roadway span direction, close to the surface of the roadway roof, between adjacent transverse anchor beam steel sections. The longitudinal anchor beams are arranged along the roadway direction at the designed row spacing, close to the steel sections of the transverse anchor beams and the lower surface of the transverse wooden backing plates. Each longitudinal anchor beam has anchor holes at the designed spacing in its steel section. The anchor cables pass vertically through the anchor holes, transverse wooden backing plates, and thin-spacing rock strata to anchor into the coal pillar remaining in the overlying goaf. Anchor cables with pre-tension are locked in place by anchor cable lock bodies.

2. The top slab anchor cable beam support structure according to claim 1, characterized in that, Both the transverse and longitudinal anchor cable beams are composed of any type of steel, such as I-beams, U-beams, channel steel, or W-beam strips, anchor cables, and anchor cable lock bodies.

3. The top slab anchor cable beam support structure according to claim 1, characterized in that, The anchor cable lock body consists of an anchor cable lock and a steel pad or anchor cable tray with a central opening. When the steel sections of the transverse anchor cable beam and the longitudinal anchor cable beam are I-beams or channel steel, a steel pad with a central opening is used instead of an anchor cable tray.

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