Closed roadway anti-scour energy-absorbing corrugated steel support and supporting method thereof

Abstract

The present application relates to a kind of closed roadway anti-scour energy-absorbing corrugated steel support, its structure is: by the arc-shaped corrugated steel of several sections head-to-tail lap joint and form circular structure;Wherein the radial section of corrugated steel is W-shaped structure, and every adjacent two sections of corrugated steel are positioned after being connected by cable clamp after lap joint;Several energy-absorbing support devices are evenly distributed on the outer surface of the overall circular structure.Corrugated steel and new energy-absorbing device are used as main support material in the support of the closed roadway anti-scour energy-absorbing corrugated steel support, and the compression resistance and transverse bending stiffness of corrugated steel plate are significantly improved, and the improvement effect of transverse bending stiffness is much higher than that of compression resistance, which greatly improves the anti-twisting ability of the support.

Description

Technical Field

[0001] This invention relates to a closed roadway anti-impact and energy-absorbing corrugated steel support and its support method, belonging to the technical field of coal mine safety support. Background Technology

[0002] Before excavation, the rock mass is under triaxial stress. During excavation, the surrounding coal and rock mass becomes biaxially stressed, forming a high-stress zone near the tunnel and accumulating a large amount of elastic strain energy. Construction disturbances or blasting vibrations can alter this equilibrium, causing a sudden and rapid release of elastic strain energy at weak points. This can lead to sudden rock and ore ejection, often resulting in roof collapses, tunnel damage, personnel casualties, equipment damage, and production disruptions. Therefore, effective tunnel erosion protection is crucial.

[0003] As a safe, reliable, and effective method of tunnel support, steel supports are widely used in deep mines prone to rock bursts. Their greatest advantage lies in their strong toughness, which can enhance the stability and strength of the surrounding rock to a certain extent. In addition, when rock bursts occur, the support can also play a supporting role, providing a large deformation space for the surrounding rock and effectively absorbing the impact energy, thus reducing the degree of damage to the tunnel.

[0004] Currently, the commonly used materials for steel supports in roadways include U-shaped steel, H-shaped steel, and V-shaped steel, which are widely used in roadways prone to rock bursts and in deep, complex roadways. However, as roadways expand towards larger spans and greater depths, steel supports require greater load-bearing capacity and stability. Currently, the main failures of steel support systems include localized lateral buckling deformation and breakage / tearing of overlapping sections. The main causes of compressive support failure are: 1. Poor lateral bending stiffness of the steel, making it prone to lateral torsion and fracture; 2. Poor sliding performance at support joints, leading to easy bending; 3. The system cannot contract inwards to absorb energy, lacking elastic contraction for support. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a closed-type anti-collision energy-absorbing corrugated steel support for roadways. This closed-type anti-collision energy-absorbing corrugated steel support uses new corrugated steel and new energy-absorbing devices as the main supporting materials in the support. The compressive and lateral bending stiffness of the corrugated steel plate are significantly improved, and the improvement effect of lateral bending stiffness is much greater than that of compressive stiffness, which greatly improves the torsional resistance of the support.

[0006] To solve the above problems, the specific technical solution of the present invention is as follows: a closed-type anti-impact and energy-absorbing corrugated steel support for roadways, which is a circular structure formed by overlapping several arc-shaped corrugated steel sections; wherein the radial cross section of the corrugated steel is a W-shaped structure, and each pair of adjacent corrugated steel sections are connected and positioned by cable clamps after overlapping; several energy-absorbing support devices are evenly distributed around the circumference of the outer surface of the overall circular structure.

[0007] A long through hole starting along the circumference is provided at every overlap of two corrugated steel sections. The cable clamp has a W-shaped structure, with at least four cable clamps forming a group. The two corrugated steel sections at the overlap are clamped between the clamping plates of the cable clamp. A long bolt in the middle of each clamping plate passes through the long through hole to clamp the two corrugated steel sections.

[0008] The energy-absorbing support device consists of several corrugated bending plates. The crest of each corrugated bending plate aligns with the trough of the adjacent upper corrugated bending plate, and they are connected and fixed at the alignment point by a connecting buckle.

[0009] The energy-absorbing support device is equipped with protective plates on its upper and lower surfaces.

[0010] The support method using the above-mentioned closed-loop roadway anti-impact and energy-absorbing corrugated steel supports includes the following steps: Step 1: Design the diameter of the overall support according to the height of the tunnel, then deduce the specifications of the corrugated steel profile and the arc length, and then determine the specifications and size of the cable clamps; Step 2: Design the length of the corrugated bending plate according to the arc length of the corrugated steel. After connecting and fixing the number of layers with connecting buckles, set the upper and lower protective plates and weld them to the corrugated steel. Step 3: Connect several corrugated steel sections end to end and support them in the tunnel. The connection is made by four sets of cable clamps and long screws, and the two adjacent corrugated steel sections are kept at the critical pressure value.

[0011] The present invention has the following advantages: High strength; the compressive and lateral bending stiffness of steel plates can be increased by 10-30 times after being corrugated. It has strong resistance to lateral torsional deformation and strong adaptability and stability. The steel arc segments are connected using cable clamps to ensure inward contraction and elastic deformation. Adding energy-absorbing components improves compressive stability and effectively absorbs energy.

[0012] In summary, this application focuses on rapid energy absorption and displacement protection against rockbursts. It adopts a circular roadway cross-section support with a relatively reasonable mechanical structure, using elastically expandable steel rings as the main body and a new type of rapid energy absorption device as a component. It improves upon the original pressure-resistant support and develops a new type of corrugated steel support structure. In the event of sudden large-scale surrounding rock vibration, deformation, or rockburst, the efficient and stable stabilization and rockburst prevention structure of the inner and outer corrugated steel rings and the effective cooperation of the rapid energy absorption and displacement device effectively buffer, absorb, and deplete the impact energy of the coal seam surrounding rock, thereby comprehensively improving the safety of mine roadway excavation support and providing a safe and reliable working environment for workers. Attached Figure Description

[0013] Figure 1 This is a front view of a corrugated steel support for a closed tunnel to prevent impact and absorb energy.

[0014] Figure 2 for Figure 1 A-direction view.

[0015] Figure 3 for Figure 2 BB cross-sectional view.

[0016] Figure 4 This is a schematic diagram showing the connection between the energy-absorbing support device and the exposed corrugated steel.

[0017] Figure 5 for Figure 4 A magnified view of a portion of the image. Detailed Implementation

[0018] like Figures 1 to 3 As shown, a closed-loop tunnel anti-impact energy-absorbing corrugated steel support consists of a circular structure formed by overlapping several arc-shaped corrugated steel sections 1. This embodiment uses four corrugated steel sections 1. The radial cross-section of each corrugated steel section 1 is W-shaped. After overlapping, each pair of adjacent corrugated steel sections 1 is connected and positioned by a clamping cable 3. At the overlapping point of each pair of corrugated steel sections 1, there is a long through hole 7 starting from the circumference. The clamping cable 3 is W-shaped, and four clamping cables 3 form a group, clamping the two corrugated steel sections 1 at the overlapping point between the clamping plates of the clamping cable 3. A long bolt 4 is set in the middle of each clamping plate of the clamping cable 3, passing through the long through hole 7 to clamp the two corrugated steel sections 1 tightly. The W-shaped structure of the corrugated steel sections 1 enables energy absorption in the axial direction of the support. At the same time, the four-segment corrugated steel section connection structure also generates relative displacement between two adjacent corrugated steel sections 1 when the support is subjected to external forces from the tunnel, providing a certain compressive strength.

[0019] like Figure 4 and Figure 5As shown, several energy-absorbing support devices 2 are evenly distributed around the circumference of the outer surface of the overall circular structure. Protective plates 8 are provided on the upper and lower surfaces of each energy-absorbing support device 2. In this embodiment, an energy-absorbing support device 2 is provided between every two cable clamping groups, for a total of four. Each energy-absorbing support device 2 consists of several corrugated bending plates 5. In this embodiment, two are used. The crest of each corrugated bending plate 5 aligns with the trough of the adjacent upper corrugated bending plate 5, and they are connected and fixed at the alignment point by connecting buckles 6; thereby achieving energy absorption in the radial direction of the support.

[0020] The support method using the above-mentioned closed-loop tunnel anti-impact and energy-absorbing corrugated steel support is characterized by the following steps: Step 1: Design the diameter of the overall support according to the height of the tunnel, then deduce the steel profile specifications and arc length of corrugated steel 1, and then determine the specifications and size of the cable clamps. Step 2: Design the length of the corrugated bending plate 5 according to the arc length of the corrugated steel 1. After connecting and fixing the number of layers with the connecting buckle 6, set the upper and lower protective plates 8 and weld them to the corrugated steel 1. Step 3: Connect several corrugated steel bars 1 end to end and support them in the roadway. The connection is made by four sets of cable clamps 3 and long screws 4, and ensure that two adjacent corrugated steel bars 1 are at the critical pressure value.

Claims

1. A closed-loop tunnel anti-impact energy-absorbing corrugated steel support, characterized in that: A circular structure formed by overlapping several segments of arc-shaped corrugated steel (1); wherein the radial section of the corrugated steel (1) is a W-shaped structure, and each pair of adjacent corrugated steel (1) segments are connected and positioned by a cable clamp (3) after overlapping. A long through hole (7) is provided at the overlap of every two corrugated steel (1) along the circumferential surface. The cable clamp (3) is a W-shaped structure. At least four cable clamps (3) are grouped together. The two corrugated steel (1) at the overlap are clamped between the clamps of the cable clamp (3). The long bolt (4) in the middle of the clamp of each cable clamp (3) passes through the long through hole (7) to clamp the two corrugated steel (1). Several energy-absorbing support devices (2) are evenly distributed on the circumference of the outer surface of the overall circular structure. The energy-absorbing support device (2) is composed of several corrugated bending plates (5). The crest of each corrugated bending plate (5) matches the trough of the adjacent upper corrugated bending plate (5) and is connected and fixed at the matching point by a connecting buckle (6).

2. The closed-loop tunnel anti-impact energy-absorbing corrugated steel support according to claim 1, characterized in that: The energy-absorbing support device (2) is provided with protective plates (8) on its upper and lower surfaces.

3. The support method using the closed-loop tunnel anti-impact energy-absorbing corrugated steel support as described in claim 1 or 2, characterized in that: Includes the following steps: Step 1: Design the diameter of the overall support according to the height of the tunnel, then deduce the steel profile and arc length of the corrugated steel (1), and then determine the specifications and size of the cable clamp; Step 2: Design the length of the corrugated bending plate (5) according to the arc length of the corrugated steel (1), and after connecting and fixing the number of layers through the connecting buckle (6), set the upper and lower protective plates (8) and weld them to the corrugated steel (1); Step 3: Connect several corrugated steel (1) end to end and support them in the roadway. The connection is made by four sets of cable clamps (3) and long bolts (4), and ensure that the two adjacent corrugated steel (1) sections are at the critical pressure value.

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