Anti-crack tunnel and roadway blowout anchor supporting structure and construction method thereof

Abstract

The invention discloses an anti-crack tunnel roadway blowout anchor supporting structure and a construction method thereof, the anti-crack tunnel roadway blowout anchor supporting structure comprises a supporting anchor rod and a first supporting steel bar mesh, the first supporting steel bar mesh and a second supporting steel bar mesh are connected through connecting steel bars, and the first supporting steel bar mesh and the second supporting steel bar mesh are anchored on surrounding rock through the supporting anchor rod. A first layer of early-strength plain concrete guniting is sprayed between the first supporting reinforcing mesh and the surrounding rock, so that the first layer of supporting reinforcing mesh is tightly attached to the first layer of early-strength plain concrete, and a second layer of early-strength plain concrete guniting is sprayed between the first supporting reinforcing mesh and the second supporting reinforcing mesh; a second layer of early-strength plain concrete is sprayed on the first supporting steel bar mesh, so that the second supporting steel bar mesh is tightly attached to the second layer of early-strength plain concrete, a third layer of early-strength plain concrete is sprayed on the second supporting steel bar mesh, and a plurality of partition plates are arranged on the side faces of the first supporting steel bar mesh and the second supporting steel bar mesh at equal intervals; and the problems of formation and falling of cracks on the concrete surface after tunnel shotcreting and anchoring can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel support, and in particular to a crack-resistant tunnel laneway blowout anchor support structure and a construction method thereof. Background Art

[0002] After tunnel excavation, the stress balance of the rock mass is broken, and the surrounding rock will move toward the inside of the tunnel to seek a new balance. If the surrounding rock strength is insufficient or there are unfavorable weak structural surfaces, it may cause rock blocks to fall or deform too much, thus endangering the safety and stability of the tunnel. Therefore, effective support measures must be taken in time after tunnel excavation to maintain the stability of the surrounding rock and the normal use of the tunnel.

[0003] At present, anchor rods and shotcrete are widely used to reinforce surrounding rocks. Anchor rods penetrate deep into the rock mass and apply prestress to improve the integrity and stability of the rock mass; shotcrete covers the surface of the rock mass to form a protective layer to prevent weathering and peeling of the rock mass. However, after construction, the shotcrete is prone to cracks or fall off due to changes in the internal force of the rock mass, affecting the safety of subsequent mining work. Summary of the invention

[0004] The purpose of the present invention is to provide a crack-resistant tunnel shaft spray anchor support structure, which can effectively reduce the formation of cracks on the concrete surface and the problem of falling after tunnel spray anchor.

[0005] The technical solution of the present invention is achieved in this way:

[0006] A crack-resistant tunnel lane blowout anchor support structure comprises a support anchor rod, a first support steel mesh, a second support steel mesh and a polyvinyl chloride resin partition. The first support steel mesh and the second support steel mesh are connected by connecting steel bars to form a support steel mesh structure. The first support steel mesh and the second support steel mesh are anchored to the surrounding rock around the tunnel by the support anchor rod.

[0007] A first layer of early-strength plain concrete is sprayed between the first supporting steel mesh and the surrounding rock, so that the first layer of supporting steel mesh is tightly attached to the first layer of early-strength plain concrete, a second layer of early-strength plain concrete is sprayed between the first supporting steel mesh and the second supporting steel mesh, so that the second supporting steel mesh is tightly attached to the second layer of early-strength plain concrete, and a third layer of early-strength plain concrete is sprayed on the second supporting steel mesh, and a number of polyvinyl chloride resin partitions are evenly spaced on the sides of the first supporting steel mesh and the second supporting steel mesh.

[0008] Furthermore, the early-strength plain concrete spraying is divided into three layers, which are sprayed on the surrounding rocks around the tunnel, the first layer of supporting steel mesh, and the second layer of supporting steel mesh respectively, and the thickness of the three layers is set to 10 cm.

[0009] Furthermore, the longitudinal and transverse spacings of the polyvinyl chloride resin partitions are both 2m, and the sprayed early-strength plain concrete is divided into 2m×2m grid blocks.

[0010] Furthermore, the first supporting steel mesh and the second supporting steel mesh are respectively closely attached to the first layer of early-strength plain concrete shotcrete and the second layer of early-strength plain concrete shotcrete, and the two layers of steel mesh are connected as a whole by the connecting steel bars.

[0011] Furthermore, two rows of reserved holes are provided on the polyvinyl chloride resin partition, and the support anchor rods can pass through the reserved holes to anchor the first layer of support steel mesh and the second layer of support steel mesh to the surrounding rock.

[0012] Furthermore, a layer of deformable soft plastic film is provided on the side of the polyvinyl chloride resin partition.

[0013] A crack-resistant tunnel well blowout anchor support structure and a construction method thereof, comprising the following steps:

[0014] (1) Excavate tunnels and install support anchors;

[0015] (2) Use support anchor rods to anchor the first layer of support steel mesh and the second layer of support steel mesh of the polyvinyl chloride resin partition passed through the reserved hole on the surrounding rock of the tunnel.

[0016] (3) Spray the first layer of early-strength plain concrete between the first supporting steel mesh and the surrounding rock.

[0017] (4) After the first layer of plain concrete reaches the required strength, the second layer of early-strength plain concrete is sprayed between the first supporting steel mesh and the second supporting steel mesh.

[0018] (5) After the second layer of plain concrete reaches the required strength, a third layer of early-strength plain concrete is sprayed on the exposed surface of the second supporting steel mesh.

[0019] The beneficial effects of the present invention are as follows: compared with the original tunnel spraying and anchoring construction method, the present invention adds a partition of polyvinyl chloride resin material on the side of the supporting steel mesh as a reserved expansion joint. This material has a small elastic modulus and good elasticity. When the internal force of the surrounding rock changes, it can effectively reduce the problem of cracks and falling on the concrete surface after the tunnel spraying and anchoring. The present invention sprays early-strength plain concrete. Compared with the original construction method, the early-strength plain concrete can reach strength faster, ensuring that mining operations can be carried out faster and increasing corporate profits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 creative work.

[0021] Figure 1 This is a schematic diagram of the patented sprayed anchor support structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the surface of the patented spray anchor support structure of the present invention;

[0023] Figure 3 It is a schematic diagram of a polyvinyl chloride resin partition with reserved holes according to the patent of the present invention. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] See attached Figure 1-Figure 3 According to an embodiment of the present invention, the crack-resistant tunnel shaft blowout anchor support structure includes a support anchor rod 1, a first support steel mesh 3, a second support steel mesh 4 and a polyvinyl chloride resin partition 5. The first support steel mesh 3 and the second support steel mesh 4 are connected by connecting steel bars to form a support steel mesh structure. The first support steel mesh 3 and the second support steel mesh 4 are anchored on the surrounding rock 2 around the tunnel through the support anchor rod 1.

[0027] A first layer of early-strength plain concrete is sprayed between the first supporting steel mesh 3 and the surrounding rock 2, so that the first layer of supporting steel mesh 3 is tightly attached to the first layer of early-strength plain concrete, a second layer of early-strength plain concrete is sprayed between the first supporting steel mesh 3 and the second supporting steel mesh 4, so that the second supporting steel mesh 4 is tightly attached to the second layer of early-strength plain concrete, and a third layer of early-strength plain concrete is sprayed on the second supporting steel mesh 4, and a number of polyvinyl chloride resin partitions 5 are arranged at equal intervals on the sides of the first supporting steel mesh 3 and the second supporting steel mesh 4, and the polyvinyl chloride resin partitions 5 are used as reserved expansion joints on the sides of the first supporting steel mesh 3 and the second supporting steel mesh 4.

[0028] Furthermore, the early-strength plain concrete spraying is divided into three layers, which are sprayed on the surrounding rock 2 around the tunnel, the first layer of supporting steel mesh 3, and the second layer of supporting steel mesh 4 respectively, and the thickness of the three layers is set to 10 cm.

[0029] Furthermore, the longitudinal and transverse spacings of the polyvinyl chloride resin partitions 5 are both 2m, and the sprayed early-strength plain concrete is divided into 2m×2m grid blocks.

[0030] Furthermore, the first supporting steel mesh 3 and the second supporting steel mesh 4 are respectively closely attached to the first layer of early-strength plain concrete spraying and the second layer of early-strength plain concrete spraying, and the two layers of steel mesh are connected as a whole by the connecting steel bar 4.

[0031] Furthermore, two rows of reserved holes 7 are provided on the polyvinyl chloride resin partition plate 5 , and the support anchor rods 1 can pass through the reserved holes 7 to anchor the first layer of support steel mesh 3 and the second layer of support steel mesh 4 on the surrounding rock 2 .

[0032] Furthermore, a layer of deformable soft plastic film 8 is provided on the side of the polyvinyl chloride resin partition 5, and the soft plastic film 8 is used to fit the uneven surface of the tunnel surrounding rock. The thickness of the partition is 2 cm and can be hung on the side of the first supporting steel mesh 3 and the second supporting steel mesh 4 as an expansion joint.

[0033] The present invention also discloses a crack-resistant tunnel well spray anchor support structure and a construction method thereof, comprising the following steps:

[0034] (1) Excavating a tunnel and installing support anchors 1;

[0035] (2) The first layer of supporting steel mesh 3 and the second layer of supporting steel mesh 4 of the polyvinyl chloride resin partition 5 passing through the reserved hole 7 are anchored on the surrounding rock 2 of the tunnel by using supporting anchor rods 1.

[0036] (3) Spray a first layer of early-strength plain concrete between the first supporting steel mesh 3 and the surrounding rock 2.

[0037] (4) After the first layer of plain concrete reaches the required strength, a second layer of early-strength plain concrete is sprayed between the first supporting steel mesh 3 and the second supporting steel mesh 4.

[0038] (5) After the second layer of plain concrete reaches the required strength, a third layer of early-strength plain concrete is sprayed on the exposed surface of the second supporting steel mesh 4.

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A crack-resistant tunnel well blowout anchor support structure, comprising a support anchor rod (1), a first support steel mesh (3), a second support steel mesh (4) and a polyvinyl chloride resin partition (5), characterized in that: The first supporting steel mesh (3) and the second supporting steel mesh (4) are connected via connecting steel bars to form a supporting steel mesh structure, and the first supporting steel mesh (3) and the second supporting steel mesh (4) are anchored to the surrounding rock (2) around the tunnel via supporting anchor rods (1); A first layer of early-strength plain concrete is sprayed between the first supporting steel mesh (3) and the surrounding rock (2), so that the first layer of supporting steel mesh (3) is closely attached to the first layer of early-strength plain concrete; a second layer of early-strength plain concrete is sprayed between the first supporting steel mesh (3) and the second supporting steel mesh (4), so that the second supporting steel mesh (4) is closely attached to the second layer of early-strength plain concrete; a third layer of early-strength plain concrete is sprayed on the second supporting steel mesh (4); and a plurality of polyvinyl chloride resin partitions (5) are arranged at equal intervals on the sides of the first supporting steel mesh (3) and the second supporting steel mesh (4).

2. The crack-resistant tunnel well spray anchor support structure according to claim 1 is characterized in that: The early strength plain concrete spraying is divided into three layers, which are respectively sprayed on the surrounding rock (2) around the tunnel, the first layer of supporting steel mesh (3), and the second layer of supporting steel mesh (4), and the thickness of the three layers is set to 10 cm.

3. The crack-resistant tunnel well spray anchor support structure according to claim 1 is characterized in that: The longitudinal and transverse spacings of the polyvinyl chloride resin partitions (5) are both 2m, and the sprayed early-strength plain concrete is divided into 2m×2m grid blocks.

4. The crack-resistant tunnel well spray anchor support structure according to claim 1 is characterized in that: The first supporting steel mesh (3) and the second supporting steel mesh (4) are respectively closely attached to the first layer of early-strength plain concrete spraying and the second layer of early-strength plain concrete spraying, and the two layers of steel mesh are connected into a whole via the connecting steel bars (4).

5. The crack-resistant tunnel well spray anchor support structure according to claim 1 is characterized in that: The polyvinyl chloride resin partition plate (5) is provided with two rows of reserved holes (7), and the support anchor rods (1) can pass through the reserved holes (7) to anchor the first layer of support steel mesh (3) and the second layer of support steel mesh (4) on the surrounding rock (2).

6. The crack-resistant tunnel well spray anchor support structure according to claim 5 is characterized in that: A layer of deformable soft plastic film (8) is provided on the side of the polyvinyl chloride resin partition (5).

7. A crack-resistant tunnel well spray anchor support structure and a construction method thereof according to any one of claims 1 to 6, characterized in that: The following steps are involved: (1) Excavating a tunnel and installing supporting anchor bolts (1); (2) anchoring the first layer of supporting steel mesh (3) and the second layer of supporting steel mesh (4) of the polyvinyl chloride resin partition (5) passing through the reserved hole (7) on the surrounding rock (2) of the tunnel using supporting anchor rods (1); (3) spraying a first layer of early-strength plain concrete between the first supporting steel mesh (3) and the surrounding rock (2); (4) After the first layer of plain concrete reaches a certain strength, a second layer of early-strength plain concrete is sprayed between the first supporting steel mesh (3) and the second supporting steel mesh (4); (5) After the second layer of plain concrete reaches the required strength, a third layer of early-strength plain concrete is sprayed on the exposed surface of the second supporting steel mesh (4).

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