Fiber composite sleeve, tunnel reinforcement structure, and reinforcement method

Abstract

The application discloses a fiber composite material sleeve lining, a tunnel reinforcing structure and a reinforcing method. The fiber composite material sleeve lining comprises a fiber composite material plate, a connecting sleeve and a limiting device. The connecting sleeve is provided with notches distributed on two sides and a connecting hole communicating the notches on the two sides. The limiting device comprises a first connecting piece, a second connecting piece and a third connecting piece. The first connecting piece is fixed on the fiber composite material plate on one side of the connecting sleeve, the second connecting piece is fixed on the fiber composite material plate on the other side of the connecting sleeve, and the third connecting piece can freely move along with the movement of the first connecting piece until the limiting part contacts with the limiting hole on the second connecting piece. The fiber composite material sleeve lining disclosed by the application can prevent the concrete of the lining protection layer from peeling off, prolong the service life of the tunnel, and the FRP profile plate is accurate in positioning, reliable in connection and strong in deformation capacity.

Description

Technical Field

[0001] This invention relates to a fiber composite material lining technology, belonging to the field of tunnel engineering technology. Specifically, it involves a design method for a non-magnetic, electrically insulating fiber composite material lining. This invention offers advantages such as high strength, strong corrosion resistance, convenient construction, and high cost-effectiveness. Background Technology

[0002] With the continuous increase in the number and mileage of tunnels, many tunnel linings experience cracking and spalling of the concrete protective layer during service, posing a threat to traffic safety. Lining reinforcement technology is an effective method for strengthening tunnel linings, preventing spalling of the inner concrete and inhibiting crack development. While it extends the service life of tunnels to some extent, the lining reinforcement construction process is cumbersome, impacts the space inside the tunnel, and the metal components present certain safety hazards for the transmission of high-voltage electricity.

[0003] Current lining reinforcement methods mainly employ reinforced concrete casting or corrugated steel plate lining. The former is relatively complex to construct, significantly impacts the tunnel's net cross-section, and cannot guarantee the bond between new and old concrete, making it more prone to spalling. The latter has poor corrosion resistance, the corrugated steel plates are heavy, and construction is inconvenient, making it unsuitable for high-speed railway tunnels with high-voltage power transmission. Therefore, there is a need to develop a lightweight, high-strength, corrosion-resistant, electrically insulating, non-magnetic, and quick-to-construct lining technology to broaden its applicability and extend the service life of tunnel linings. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fiber composite material lining, tunnel reinforcement structure and reinforcement method that is easy to construct and prevents excessive deformation from causing the corrugated plate to slip off.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] This invention first provides a fiber composite material bushing, comprising:

[0007] A fiber composite material board includes an arc-shaped board body; a groove is provided at one end of the arc-shaped board body, and a protrusion is provided at the other end of the arc-shaped board body; the protrusion can be embedded in the groove.

[0008] A connecting sleeve has slots distributed on both sides and a connecting hole connecting the two slots; the cross-sectional width of the connecting hole is smaller than the cross-sectional width of the slot; one end of the fiber composite material plate with a groove is inserted into one slot of the connecting sleeve, and one end of the fiber composite material plate with a protrusion is inserted into the other slot of the connecting sleeve; the protrusion at one end of the fiber composite material plate is inserted into the groove at one end of the other fiber composite material plate through the connecting hole, and the connecting hole forms a movable area between the protrusion end face and the bottom surface of the groove;

[0009] A limiting device includes a first connector, a second connector, and a third connector; the first connector is fixed to a fiber composite material plate on one side of the connecting sleeve, and the second connector is fixed to a fiber composite material plate on the other side of the connecting sleeve; a limiting hole is provided on the second connector, and a limiting portion is provided on the third connector; the third connector presses against the connecting sleeve, one end of the third connector is fixed to the first connector, and the other end of the third connector passes through the limiting hole of the second connector; the third connector can move freely with the movement of the first connector until the limiting portion contacts the limiting hole on the second connector.

[0010] The present invention also provides a tunnel reinforcement structure, comprising:

[0011] Fiber composite liner;

[0012] Adhesive material is used to fill the space between the fiber composite liner and the inner surface of the secondary liner;

[0013] The base is used to fix the fiber composite material bushing;

[0014] Base bolts are used to connect the base to the concrete foundation.

[0015] The present invention also provides a tunnel reinforcement method, comprising:

[0016] Fix the base to the concrete foundation;

[0017] Fiber composite material bushing is fixed on the base;

[0018] Inorganic cementitious material is injected into the inside of the fiber composite liner.

[0019] This invention relates to a lining system that uses a plug-in connection between multi-axial FRP profiles and epoxy resin, facilitating construction. Structural fiber cement grout is injected along the tunnel lining surface to bond the FRP profiles to the lining, ensuring convenient assembly and accurate positioning. A limiting device prevents the FRP corrugated plates from slipping due to excessive deformation, creating a self-locking structure under large deformation. The fiber composite lining technology is insulating, non-magnetic, and corrosion-resistant, with a specific strength 6.6 times that of corrugated steel plate linings, thus improving the overall performance and applicability of the lining.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) This invention is made of multiple multi-axial FRP corrugated plates spliced ​​together. Compared with traditional corrugated steel plates and tension-type FRP corrugated plate lining, the construction is more convenient and the connection is more reliable. No additional auxiliary load-bearing components in the vertical fiber direction are required.

[0022] 2) The adjacent FRP corrugated plates adopt a structure in which they are inserted and bonded to the sleeve with epoxy resin. A gap is left in the middle to allow the corrugated plates to slide relative to each other, which increases the deformation capacity of the lining and can coordinate the deformation according to the lining contour.

[0023] 3) The limiting device enables the FRP corrugated plate to form a self-locking mechanism, preventing the FRP corrugated plate from separating under large deformation and causing the overall failure of the lining, thus maintaining the integrity of the basalt composite material lining under large deformation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a fiber composite material liner technology according to the present invention.

[0025] Figure 2 This is a schematic diagram of a slot connection using a fiber composite material bushing technology according to the present invention.

[0026] Figure 3 This is a schematic diagram of the slot connection principle of a fiber composite material bushing technology according to the present invention.

[0027] Figure 4 This is a schematic diagram of a fiber composite material bushing technology limiting device according to the present invention.

[0028] Figure 5 This is a schematic diagram of the base connection of a fiber composite material bushing technology according to the present invention.

[0029] The diagram shows: 1. Primary lining; 2. Secondary lining; 3. Fiber composite board; 4. Base; 5. Slot connection; 6. Limiting device; 7. Connecting sleeve; 41. Base bolt; 51. Groove part; 52. Protruding part; 61. Thick plate; 62. Thin plate; 63. U-shaped plate; 64. Square hole; 71. Sleeve grouting hole. Detailed Implementation

[0030] The specific embodiments of the present invention will be further explained in detail below with reference to the accompanying drawings. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, any modifications of the present invention in various equivalent forms by those skilled in the art fall within the scope defined by the appended claims.

[0031] The problem this invention aims to solve is to reduce the construction time and procedures of cast-in-place concrete linings, overcome the problems of poor corrosion resistance and electrical conductivity of corrugated steel plate linings, and address the difficulties in connecting pultruded FRP corrugated plate linings and the complexity of the procedures. A fiber composite material lining technology is proposed, which facilitates the assembly of corrugated plates, ensures reliable connections, maintains strong integration with the existing lining, accurately positions the lining interior with the concrete, and significantly improves the overall deformation capacity of the lining, further enhancing the applicability of fiber composite material linings.

[0032] The invention will be further described below with reference to the accompanying drawings.

[0033] Example 1

[0034] like Figure 1 As shown, the present invention provides a fiber composite material bushing, comprising:

[0035] The fiber composite board (FRP corrugated board) 3 has a connection structure consisting of a protruding portion 52 and an insertion groove portion 51, and adjacent fiber composite boards 3 are bonded together with epoxy resin.

[0036] The material of fiber composite plate 3 is basalt fiber composite material, carbon fiber composite material or other fibers.

[0037] The connecting sleeve 7 has slots distributed on both sides and a connecting hole connecting the two slots; the cross-sectional width of the connecting hole is smaller than the cross-sectional width of the slot; the end of the fiber composite board with a groove is inserted into the slot on one side of the connecting sleeve, and the end of the fiber composite board with a protrusion is inserted into the slot on the other side of the connecting sleeve; the protrusion at one end of the fiber composite board is inserted into the groove at one end of the other fiber composite board through the connecting hole, and the connecting hole forms a movable area between the protrusion end face and the bottom surface of the groove;

[0038] The limiting device 6 includes a first connector, a second connector, and a third connector; the first connector is fixed to a fiber composite material plate on one side of the connecting sleeve, and the second connector is fixed to a fiber composite material plate on the other side of the connecting sleeve; a limiting hole is provided on the second connector, and a limiting portion is provided on the third connector; the third connector presses against the connecting sleeve, one end of the third connector is fixed to the first connector, and the other end of the third connector passes through the limiting hole of the second connector; the third connector can move freely with the movement of the first connector until the limiting portion contacts the limiting hole on the second connector.

[0039] In one embodiment, the connecting sleeve 7 is a channel with corrugated openings on the side wall and a circular sleeve grouting hole 71 at the top. The inside is a fiber composite material plate 3 connection structure, and epoxy resin and other materials are injected through the grouting hole.

[0040] In one embodiment, the limiting device 6 consists of a thick plate 61, a thin plate 62, a U-shaped plate 63, and two square holes 64. The U-shaped plate 63 is bonded to the thick plate 61 with epoxy resin; the square holes 64 are bonded to the thin plate 62 with epoxy resin; and the thin plate 62, the thick plate 61, and the fiber composite material plate 3 are bonded with epoxy resin.

[0041] In one embodiment, the fiber composite board 3 is a bidirectional curved profile board with a corrugated cross-section and an arc-shaped longitudinal direction; the cross-sectional length is 1.2m and the longitudinal length is 4m. The fiber composite board 3 is molded from multiple layers of dissimilar fiber cloths, and has excellent multidirectional mechanical and bonding properties.

[0042] The fiber composite board 3 has a raised portion 52 at one end perpendicular to the corrugation and a grooved portion 51 at the other end.

[0043] In one embodiment, the connection of the fiber composite board 3 is constructed such that the protrusion 52 is inserted into the groove 51, and adjacent fiber composite boards 3 are bonded with epoxy resin.

[0044] The thickness of both the protruding portion 52 and the grooved portion 51 is 1 / 3 of the total thickness of the corrugated plate 3; the depth to which the protruding portion 52 is inserted into the groove 51 is 1 / 2 to 1 / 3 of the protruding portion 52, and a certain gap is left between adjacent corrugated plates 3.

[0045] In one embodiment, the length of the protrusion 52 and the length of the groove 51 are the same, which is 100-200 mm.

[0046] In one embodiment, the base 4 is a T-shaped FRP profile, which is fixed to the tunnel arch foot position by base bolts 41 to restrict the position of the fiber composite board 3 and facilitate subsequent grouting.

[0047] In one embodiment, the U-shaped plate 63 is inserted into the square hole 64 and can move freely with the movement of the thick plate 61 until it contacts the square hole 64.

[0048] Example 2

[0049] This embodiment provides a tunnel reinforcement structure, such as Figure 1 As shown, it includes:

[0050] The fiber composite material bushing provided in Example 1,

[0051] Adhesive material is used to fill the space between the fiber composite plate 3 and the inner surface of the secondary lining 2;

[0052] Base 4, a T-shaped FRP profile used to define the position of the FRP profile sheet;

[0053] Base bolt 41 is used to connect base 4 to the concrete foundation.

[0054] Example 3

[0055] This embodiment provides a tunnel reinforcement method, which uses the fiber composite material bushing provided in Embodiment 1 for reinforcement. The construction steps are as follows:

[0056] Step 1: Produce multiaxial fiber composite material plate 3 with grooves and protrusions according to the design scheme to meet the composite requirements;

[0057] Step 2: According to the design plan, use base bolts 41 to fix the base 4 to the concrete at the arch foot of the secondary lining 2;

[0058] Step 3: Begin splicing the fiber composite material panels 3 from the arch foot position of the secondary lining 2 on one side. The splicing direction can be clockwise or counterclockwise, or the splicing sequence can be from both sides to the top. When splicing, evenly apply epoxy resin to the protruding part 52 of the fiber composite material panel 3 and then insert it into the groove part 51, maintaining a certain distance between them, without fully inserting it.

[0059] Step 4: Insert the connecting sleeve 7 into the fiber composite plate 3 from one end, push it into the corrugated plate connection position, and inject epoxy resin into the grouting hole 71 of the sleeve to complete the connection assembly.

[0060] Step 5: Use epoxy resin to bond the thick plate 61 and the thin plate 62 to the adjacent ends of the adjacent fiber composite material plates 3 respectively. Insert the U-shaped plate 63 into the two square holes 64 on the thin plate 62. The end of the U-shaped plate 63 is bonded to the surface of the thick plate 61 with epoxy resin to complete the positioning.

[0061] Step Six: Inorganic cementitious materials such as cement mortar are injected into the corrugated plate through the grouting holes.

[0062] The examples in this manual are described in a progressive manner. Each example focuses on the differences between the examples and the others. For the same or similar parts between examples, please refer to each other.

Claims

1. A fiber composite material bushing, characterized in that, include: A fiber composite material board includes an arc-shaped board body; a groove is provided at one end of the arc-shaped board body, and a protrusion is provided at the other end of the arc-shaped board body; The protrusion can be embedded in the groove; A connecting sleeve has slots distributed on both sides and a connecting hole connecting the two slots; the cross-sectional width of the connecting hole is smaller than the cross-sectional width of the slot; one end of the fiber composite material plate with a groove is inserted into one slot of the connecting sleeve, and one end of the fiber composite material plate with a protrusion is inserted into the other slot of the connecting sleeve; the protrusion at one end of the fiber composite material plate is inserted into the groove at one end of the other fiber composite material plate through the connecting hole, and the connecting hole forms a movable area between the protrusion end face and the bottom surface of the groove; A limiting device includes a first connector, a second connector, and a third connector; the first connector is fixed to a fiber composite material plate on one side of the connecting sleeve, and the second connector is fixed to a fiber composite material plate on the other side of the connecting sleeve; a limiting hole is provided on the second connector, and a limiting portion is provided on the third connector; the third connector presses against the connecting sleeve, one end of the third connector is fixed to the first connector, and the other end of the third connector passes through the limiting hole of the second connector; the third connector can move freely with the movement of the first connector until the limiting portion contacts the limiting hole on the second connector.

2. The fiber composite material bushing according to claim 1, characterized in that, The length of the active area is 1 / 2 to 1 / 3 of the length of the protrusion.

3. The fiber composite material bushing according to claim 1, characterized in that, The connecting sleeve is a grouting sleeve, and a grouting hole is provided on the grouting sleeve; the groove and the connecting hole are formed by inserting the fiber composite material plate into the grouting sleeve and then injecting grout.

4. The fiber composite material bushing according to claim 1, characterized in that, The third connecting member is a U-shaped plate; the bottom plate of the U-shaped plate is the limiting part.

5. A fiber composite material bushing according to claim 4, characterized in that, The first connector is a thick plate; the second connector is a thin plate.

6. A fiber composite material bushing according to claim 1, characterized in that, The fiber composite material board is a bidirectional bending profile board with a corrugated cross section and an arc-shaped longitudinal direction; The cross-sectional length is 1~2 m, and the longitudinal length is 3~5 m.

7. A tunnel reinforcement structure, characterized in that, include: The fiber composite liner according to any one of claims 1-6; Adhesive material is used to fill the space between the fiber composite liner and the inner surface of the secondary liner. The base is used to fix the fiber composite material bushing; Base bolts are used to connect the base to the concrete foundation.

8. A tunnel reinforcement structure according to claim 7, characterized in that, The base is a T-shaped FRP profile, which is fixed to the tunnel arch foot position with base bolts to restrict the position of the FRP profile plate and facilitate subsequent grouting.

9. A tunnel reinforcement method, characterized in that, include: Fix the base to the concrete foundation; Fix the fiber composite material bushing according to any one of claims 1-6 onto the base; Inorganic cementitious material is injected into the inside of the fiber composite liner.

10. A tunnel reinforcement method according to claim 9, characterized in that, include: Start splicing the fiber composite panels from the arch foot position on one side of the secondary lining. The splicing direction can be clockwise or counterclockwise, or the splicing sequence can be from both sides to the top. When splicing, apply epoxy resin evenly to the raised part of the fiber composite panel and then insert it into the groove part. Do not fully insert the two parts to maintain the distance of the movable area. Insert the connecting sleeve into the fiber composite board from one end, push it into the connection position of the fiber composite board, and inject epoxy resin into the grouting hole of the sleeve to complete the connection and assembly. The first and second connectors are bonded to the adjacent ends of adjacent fiber composite boards using epoxy resin adhesive. The third connector is inserted into the limiting hole on the second connector, and the end of the third connector is bonded to the surface of the first connector with epoxy resin to complete the limiting.

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