Wood crib structure for underground coal mine

Abstract

The utility model provides a wood crib structure under a coal mine, which belongs to the technical field of coal mine support and comprises at least two square timber layers which are lapped longitudinally and transversely alternately along the height direction, each square timber layer is provided with at least two square timbers in parallel, the upper end face of each square timber is provided with at least two grooves I, and each groove I is provided with a groove II; the lower end face of each square timber is provided with at least two second grooves, and the first grooves and the second grooves are oppositely arranged. In any two adjacent square timber layers, the groove I of the square timber in the lower square timber layer and the groove II of the square timber in the upper square timber layer are clamped together to form a mortise and tenon joint structure. The utility model has the beneficial effects that each independent square timber can be mutually meshed, so that the twisting of the square timber in each direction is effectively limited, the stability of a wood crib is improved, and a key role is played on a large-section support; meanwhile, along with continuous increase of stress, the tenon-and-mortise well-shaped wood crib can be pressed more and more tightly, and the whole wood crib structure is more and more stable.

Description

Technical Field

[0001] The utility model belongs to the technical field of coal mine support, and in particular relates to a wood pile structure under a coal mine. Background Art

[0002] Tunnel excavation is a crucial operation in underground mining. However, this action inevitably has a significant impact on the surrounding rock mass, causing complex deformation. Through long-term and detailed monitoring of the mine pressure in adjacent tunnels, a series of dynamic changes after tunnel excavation can be clearly observed. Initially, as excavation progresses, the sides of the tunnel respond rapidly, exhibiting a clear deformation trend toward the center. Then, as deformation continues, once it reaches a certain level, the rate of deformation gradually slows due to the inherent strength and elastic modulus of the surrounding rock, ultimately reaching a relatively stable state.

[0003] At the same time, over time, vertical pressure on the roof gradually accumulates, leading to increasing settlement. This is especially true in large-section tunnels, where the roof pressure is even more pronounced due to the large span and exposed area. Traditional active support methods, such as anchor bolts and cables, while able to limit deformation of the surrounding rock to a certain extent, often prove inadequate in the face of such immense pressure.

[0004] Therefore, large-section tunnels often use woodpile support as an auxiliary support method to slow down further settlement of the roof. However, when the tunnel floor bulges or the pressure on the roof continues to increase, the existing woodpile structure is easily unstable due to its poor stability when squeezed, posing a serious risk to safe production in the tunnel. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a woodpile structure in a coal mine using a mortise and tenon structure, which can effectively limit the twisting of square timber in all directions, thereby increasing the stability of the woodpile and playing a key role in large-section support.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a woodpile structure in a coal mine, comprising at least two layers of square timbers alternately overlapped vertically and horizontally along the height direction, each layer of square timbers being arranged in parallel with at least two square timbers, the upper end face of each square timber being provided with at least two grooves 1, and the lower end face of each square timber being provided with at least two grooves 2, with grooves 1 and 2 being arranged opposite to each other; in any two adjacent layers of square timbers, grooves 1 of the square timbers in the lower layer of square timbers are snapped together with grooves 2 of the square timbers in the upper layer of square timbers to form a mortise and tenon structure, so that since the woodpile in the present invention adopts a mortise and tenon structure, each individual square timber can engage with each other, effectively limiting the twisting of the square timbers in all directions, thereby increasing the stability of the woodpile and playing a key role in supporting large cross-sections. At the same time, as the stress continues to increase, the mortise and tenon well-type woodpile of the present invention will become tighter and tighter, and the entire woodpile structure will become more and more stable.

[0007] Furthermore, in any two adjacent layers of square timber, any square timber in the upper layer is engaged with all the square timbers in the lower layer, so as to ensure that the two adjacent layers of square timber can be firmly fastened together.

[0008] Furthermore, the depth of the first groove and the depth of the second groove are both one quarter of the thickness of the square wood.

[0009] Furthermore, the width of the groove 1 and the width of the groove 2 are both the width of the square wood.

[0010] Furthermore, the length of the square timber is 150 mm, and the width and thickness of the square timber are both 150 mm.

[0011] Furthermore, fillers are filled between adjacent square timbers, and the entire timber stack is tightened by the fillers.

[0012] Furthermore, the filler is gangue or wood chips, and the density and bearing capacity of the wood pile are increased by the filler.

[0013] As can be seen from the above technical solution, the present invention has the following advantages: Because the woodpile in the present invention utilizes a mortise and tenon structure, it enables each individual timber to interlock, effectively limiting any directional twisting of the timbers. This increases the stability of the woodpile and plays a key role in supporting large cross-sections. Furthermore, as stress continues to increase, the mortise and tenon well-type woodpile in the present invention becomes increasingly compacted, and the entire woodpile structure becomes increasingly stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is a schematic diagram of the structure of the square wood in the utility model;

[0016] Figure 2 It is a structural diagram of a specific embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the utility model when it is applied in an underground coal mine.

[0018] In the picture: 1. Square wood; 2. Groove 1; 3. Groove 2. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figures 1 to 3 As shown, the utility model provides a woodpile structure in a coal mine, which includes at least two layers of square timber layers alternately overlapped vertically and horizontally along the height direction, each layer of square timber layers has at least two square timbers 1 arranged in parallel, the upper end surface of each square timber 1 is provided with at least two grooves 1 2, and the lower end surface of each square timber 1 is provided with at least two grooves 2 3, and the grooves 1 2 and 2 3 are arranged opposite to each other; in any two adjacent layers of square timber layers, any square timber 1 in the lower layer is clamped together with all the square timbers 1 in the upper layer through grooves 1 2 and grooves 2 3, and any square timber 1 in the upper layer is clamped together with all the square timbers 1 in the lower layer through grooves 1 2 and grooves 2 3, to form a mortise and tenon structure.

[0021] Because the woodpile of the present invention utilizes a mortise and tenon structure, each individual timber 1 can interlock with each other, effectively limiting the twisting of the timber 1 in all directions. This increases the stability of the woodpile and plays a key role in supporting large cross-sections. Furthermore, as stress continues to increase, the mortise and tenon well-type woodpile of the present invention becomes increasingly compressed, and the entire woodpile structure becomes increasingly stable, effectively preventing the increase in surrounding rock gravity, thereby reducing the stress acting on the roadway support and reducing the manifestation of ground pressure in the roadway.

[0022] Furthermore, preferably, the length of the square timber 1 is 150 mm, the width and thickness of the square timber 1 are both 150 mm, the depth of the groove 1 2 and the depth of the groove 2 3 are both preferably one-quarter of the thickness of the square timber, i.e., 37.5 mm, and the width of the groove 1 2 and the width of the groove 2 3 are both preferably the width of the square timber, i.e., 150 mm. Furthermore, during actual construction, after the entire woodpile is stacked, it can be filled with fillers such as waste rock and wood chips, and the fillers can be used to tighten the entire woodpile to increase its density and load-bearing capacity.

[0023] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the present invention and the accompanying drawings are used to distinguish similar items and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0024] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A woodpile structure in a coal mine, comprising at least two layers of timber alternately overlapped vertically and horizontally along the height direction, each layer of timber having at least two timbers arranged in parallel; characterized in that: The upper end surface of each square timber is provided with at least two grooves 1, and the lower end surface of each square timber is provided with at least two grooves 2, and the grooves 1 and the grooves 2 are arranged opposite to each other; in any two adjacent layers of square timber, the grooves 1 of the square timbers in the lower layer are snapped together with the grooves 2 of the square timbers in the upper layer; fillers are filled between adjacent square timbers, and the fillers are gangue or wood chips.

2. The wood pile structure in a coal mine according to claim 1, characterized in that: In any two adjacent layers of square timber, any square timber in the upper layer is connected to all the square timbers in the lower layer.

3. The wood pile structure in a coal mine according to claim 1 or 2, characterized in that: The depth of groove one and the depth of groove two are both one-fourth of the thickness of the square wood.

4. The wood pile structure in a coal mine according to claim 3, characterized in that: The width of groove one and the width of groove two are both the width of the square wood.

5. The wood pile structure in a coal mine according to claim 3, characterized in that: The length of the square timber is 150 mm, and the width and thickness of the square timber are both 150 mm.

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