Anchor rod reinforcing and pasting steel plate strip reinforcing structure for tunnel

Abstract

The utility model discloses an anchor rod reinforcing and pasting steel plate strip reinforcing structure for a tunnel, which comprises a steel plate strip, a chemical anchor bolt (3) and a resin anchor rod (4), the steel plate strip is arranged along the circumferential direction of a tunnel lining and is formed by connecting steel plate strip sections (1) end to end, and the joint position adopts a steel plate strip section connecting steel plate (2) to reinforce the connection; the steel plate strip is pasted on the surface of a lining through sticky steel glue, the steel plate strip and a tunnel secondary lining are anchored into a whole through the chemical anchor bolts (3), and the steel plate strip section (1) of a tunnel vault section is anchored in a reinforced mode through the resin anchor rods (4). The steel plate belt and the long and short anchor rods are used for reinforcing, a strong anchoring effect is achieved when the thickness of a tunnel vault lining is insufficient and a cavity exists behind the tunnel vault lining, the stability and the bearing capacity of the tunnel lining are remarkably improved, the steel plate belt sections designed in a segmented mode are allowed to be installed in a limited tunnel space, and the construction cost is reduced. And the construction difficulty and the construction cost are reduced.

Description

Technical Field

[0001] The embodiments of the utility model belong to the technical field of tunnel engineering, and more specifically, relate to a tunnel anchor rod reinforced steel plate strip reinforcement structure. Background Art

[0002] With rapid economic development, my country's highway network continues to expand. As an essential component of highways, tunnels are rapidly increasing in number and length. As years of operation continue to increase, some existing tunnels have experienced varying degrees of lining defects, primarily manifested as insufficient secondary lining thickness, loose or voided lining concrete, lining cracking, misalignment, displacement, and water leakage. These defects severely reduce tunnel performance and impact structural safety. As my country's highway construction gradually shifts toward a phase of simultaneous construction and maintenance, tunnel operational safety has become a key industry concern. Tunnel reinforcement technology is a crucial means of ensuring tunnel safety. Lining reinforcement with bonded steel plates is a widely used technique, offering advantages such as minimal disturbance, no intrusion, and rapid construction. Anchor bolts effectively integrate the steel plates with the concrete on the secondary lining surface, achieving coordinated deformation and shared load bearing when subjected to external loads. For example, the patent document with application number CN202222959735.X discloses a structure for treating cracks in tunnel linings by pasting steel plates. The utility model structure includes anchor bolts and steel strips. The steel strips are connected by connecting several steel plates head to tail. Reinforcement plates are installed at the interfaces to strengthen the connectivity. The steel strips are circumferentially curved, and the curvature and length match the curvature and circumferential length of the secondary lining. The steel strips are circumferentially anchored to the secondary lining by anchor bolts, and composite steel adhesive is poured between the secondary lining and the steel strips. The utility model structure is simple and stable, easy to construct, and makes the reinforced secondary lining more stable and extends its service life. However, when the thickness of the top of the lining is too thin and there is a cavity behind it, the use of ordinary anchor bolts cannot guarantee the effective anchoring depth, and the pasted steel plates may fall off when grouting the cavity behind the arch lining, and the reinforcement effect cannot be achieved. Utility Model Content

[0003] In response to the above defects or improvement needs of the prior art, the utility model provides a tunnel anchor rod reinforced steel plate strip reinforcement structure. By pasting the steel plate strip on the tunnel lining surface and anchoring it with chemical anchor bolts and resin anchor rods, the application effect of reinforcing the secondary lining with the pasted steel plate strip is achieved. At the same time, the risk of damage to the lining due to increased pressure during grouting of the cavity behind the lining is reduced, the stability and bearing capacity of the lining are improved, and the pasted steel plate structure has a stronger anchoring effect when dealing with insufficient lining thickness and cavity behind.

[0004] In order to achieve the above-mentioned purpose, the utility model discloses a tunnel anchor rod reinforced steel plate strip reinforcement structure, comprising a steel plate strip, a chemical anchor bolt and a resin anchor rod.

[0005] The steel strips are arranged along the circumference of the tunnel lining and are formed by butt-welding steel strip segments end to end. The interfaces are reinforced by bolting the steel strip segments to the steel plates.

[0006] The steel strip is adhered to the lining surface by means of steel glue, and is anchored integrally with the tunnel secondary lining by means of the chemical anchor bolts, and the steel strip segments in the tunnel vault section are reinforced with the resin anchor rods.

[0007] Furthermore, two rows of anchor holes are symmetrically opened on the steel plate strip segment and the steel plate connecting the steel plate strip segment, and the chemical anchor bolts pass through the anchor holes to anchor the steel plate strip segment and the steel plate connecting the steel plate strip segment to the secondary lining of the tunnel.

[0008] Furthermore, the steel plate strip segments are connected end to end by butt welding.

[0009] Furthermore, the chemical anchor bolt and the resin anchor rod end connector are designed to be detachable.

[0010] Furthermore, the resin anchor rod is driven into the surrounding rock through its head, and its end is fixed to the steel plate strip segment.

[0011] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0012] (1) The utility model uses anchor rods to strengthen the steel plate strip reinforcement structure of the tunnel. The steel plate strip is pasted on the lining surface and anchored with chemical anchor bolts. At the same time, the steel plate strip segment of the arch section is reinforced with resin anchor rods. This solves the problem that when the thickness of the top of the lining is too thin and there is a cavity behind it, the ordinary anchor bolts cannot ensure the effective anchoring depth, and the grouting of the cavity behind the arch lining may cause the pasted steel plate to fall off. It achieves a stronger anchoring effect when the arch lining is not thick enough and there is a cavity behind it, and significantly improves the stability and bearing capacity of the tunnel lining.

[0013] (2) The utility model uses anchor rods to strengthen the steel plate strip reinforcement structure. The steel plate strip adopts a segmented assembly design, which allows installation in a limited tunnel space, reducing the construction difficulty and construction cost. The steel plate strip segments are segmented and spliced ​​by butt welding and connecting steel plate bolts to form a continuous and stable arch structure, ensuring the integrity and bearing capacity of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of a tunnel anchor rod reinforced with steel plate strip reinforcement structure according to an embodiment of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure for reinforcing and treating tunnel lining defects by reinforcing anchor rods with steel plates and strips according to an embodiment of the utility model.

[0016] In all the drawings, the same reference numerals represent the same technical features, specifically: 1—steel plate segment, 2—steel plate segment connecting plate, 3—chemical anchor bolt, 4—resin anchor rod. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0018] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0020] In this patent, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0021] like Figure 1 As shown, an embodiment of the utility model provides a tunnel anchor rod reinforced steel plate strip reinforcement structure, comprising a steel plate strip, a chemical anchor bolt 3 and a resin anchor rod 4. The steel plate strip is connected to the tunnel secondary lining as a whole through adhesive steel glue and the chemical anchor bolt 3, and the steel plate strip of the tunnel arch section is reinforced with the resin anchor rod 4 to effectively connect the steel plate strip with the secondary lining, and efficiently achieve the reinforcement effect of the bonded steel plate. It has good anchoring performance when the tunnel lining thickness is insufficient and there is a cavity behind it for reinforcement.

[0022] Among them, the steel plate strip is arranged along the circumference of the tunnel lining. Since the ring secondary lining length of the steel plate strip is relatively long, the steel plate strip is constructed in sections to facilitate installation and construction in the tunnel. The steel plate strip is made of 3 to 5 sections of steel plate strip segments 1 that are butt-welded end to end. The interface position is reinforced by the steel plate strip segment connecting steel plate 2 to form a continuous reinforcement ring, which enhances the integrity and durability of the structure.

[0023] Two rows of anchor holes are symmetrically opened on the steel plate strip segment 1 and the steel plate 2 connecting the steel plate strip segment. The chemical anchor bolts 3 pass through the anchor holes to anchor the steel plate strip segment 1 and the steel plate 2 connecting the steel plate strip segment to the secondary lining of the tunnel, thereby anchoring the steel plate strip and the secondary lining of the tunnel into one.

[0024] The resin anchor rod 4 is used to strengthen the anchoring of the steel plate strip segment 1 of the arch. The resin anchor rod 4 is driven into the surrounding rock through its head and bonded to the rock mass through the resin anchoring agent. The end is fixed to the steel plate strip segment 1 to solve the problem that when the lining thickness is thin and there may be cavities behind the arch lining, the conventional chemical anchor bolt 3 is limited in length and cannot achieve effective anchoring. When grouting the arch cavity, the pressure brought about may cause the thinner lining structure to be damaged, and the pasted steel plate strip will fall off and the reinforcement effect cannot be achieved, thereby achieving strengthened anchoring of the steel plate strip.

[0025] The ends of the chemical anchor bolts 3 and the resin anchor rods 4 are detachable connectors, which are convenient for adjustment and installation during the construction process.

[0026] The structural principle of this utility model is to improve the stability and load-bearing capacity of the tunnel lining by attaching steel strips to the surface of the tunnel lining and anchoring them with chemical anchor bolts and resin anchor rods. Specifically, the steel strips are connected in sections by connecting steel plates 2 and chemical anchor bolts 3 through steel strip segments, ensuring the continuity and integrity of the steel strips. The steel strip segments 1 are attached to the lining surface with adhesive and anchored to the lining with chemical anchor bolts 3, increasing the tensile strength of the lining. In the vault area, longer resin anchor rods 4 are driven in to provide additional anchoring force, ensuring the stability and reliability of the reinforced structure even in cases where the lining thickness is insufficient or there are voids behind it.

[0027] Embodiment 1 of the present utility model:

[0028] This embodiment of the tunnel anchor-reinforced steel strip reinforcement structure is suitable for medium-thickness tunnel lining reinforcement. In this embodiment, the steel strip consists of four equal-length steel strip segments 1, each approximately one-quarter the tunnel circumference. These steel strip segments are butt-welded end-to-end within the tunnel. The joints are reinforced with specially reinforced steel strip segment connecting plates 2. These steel strip segment connecting plates 2 are equipped with the same anchor hole layout as the steel strip segments 1, ensuring even distribution and effective fixation of the chemical anchor bolts 3.

[0029] Chemical anchor bolts 3 are made of high-strength, corrosion-resistant stainless steel, with a diameter of 20 mm and a length of 150 mm, determined based on the thickness of the tunnel lining. This ensures penetration and effective anchoring. Before attaching the steel strips, the surface of the tunnel secondary lining is cleaned and pretreated to ensure adequate adhesion of the adhesive. The adhesive is a high-performance structural adhesive with excellent shear and peel strength, ensuring a secure connection between the steel strips and the lining.

[0030] The steel strip segments 1 in the tunnel vault section are reinforced with 300mm-long resin anchor rods 4. The fast-curing resin anchor achieves the designed strength within a short time, ensuring efficient construction and effective reinforcement. The ends of the resin anchor rods are secured to the steel strip segments via custom connectors.

[0031] Embodiment 2 of the present utility model:

[0032] The tunnel anchor-reinforced steel strip reinforcement structure of this embodiment is particularly suitable for tunnels with thin linings and voids. In this embodiment, considering the fragility of the lining and the additional pressure from the voids, the steel strip is composed of five shorter steel strip segments 1 to accommodate more complex construction conditions and more sophisticated reinforcement requirements.

[0033] After welding, the steel strip segments 1 were reinforced with reinforced steel strip segment connecting plates 2. The diameter of the chemical anchor bolts was increased to 25 mm, and their length was adjusted to 200 mm to accommodate the thinner lining thickness and ensure sufficient anchoring depth. Furthermore, to increase the number and density of anchor points, more anchor holes were opened in each steel strip segment and connecting steel plate.

[0034] Specially designed long resin anchor rods 4 were used to reinforce the steel plate strip segments 1 in the vault section. The length of the resin anchor rods 4 was increased to 400 mm to allow them to penetrate the underlying cavity and reach the stable surrounding rock layer. The head of the resin anchor rods 4 features a tapered hole expansion structure, which creates a larger anchoring area when driven into the surrounding rock, improving the anchoring effect. The end connectors of the resin anchor rods 4 are detachable, facilitating adjustment and installation during construction.

[0035] In both implementations, strict construction quality control and on-site monitoring ensure the stability and reliability of the reinforced structure. Furthermore, the length of the steel strip, the number of segments, the specifications and number of chemical anchor bolts, and the length and type of resin anchor rods can be flexibly adjusted to meet the specific reinforcement requirements of different tunnels.

[0036] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A tunnel anchor reinforced steel plate reinforcement structure, characterized in that: It includes a steel strip, a chemical anchor bolt (3) and a resin anchor rod (4). The steel strip is arranged along the circumference of the tunnel lining and is formed by butt-welding steel strip segments (1) end to end, and the interface position adopts the steel strip segment connecting steel plates (2) to strengthen the connection by bolting; The steel strip is adhered to the lining surface by means of steel glue and is anchored integrally with the tunnel secondary lining by means of the chemical anchor bolts (3), and the steel strip segment (1) in the tunnel vault section is reinforced with the resin anchor rod (4).

2. The tunnel anchor reinforcement steel plate strip reinforcement structure according to claim 1, characterized in that: Two rows of anchor holes are symmetrically provided on the steel plate strip segment (1) and the steel plate strip segment connecting steel plate (2), and the chemical anchor bolts (3) pass through the anchor holes to anchor the steel plate strip segment (1) and the steel plate strip segment connecting steel plate (2) to the secondary lining of the tunnel.

3. The tunnel anchor reinforcement steel strip reinforcement structure according to claim 2, characterized in that: The steel plate strip segments (1) are connected end to end by butt welding.

4. The tunnel anchor reinforcement steel strip reinforcement structure according to claim 1, characterized in that: The end connectors of the chemical anchor bolt (3) and the resin anchor rod (4) are designed to be detachable.

5. The tunnel anchor reinforcement steel plate strip reinforcement structure according to claim 1, characterized in that: The resin anchor rod (4) is driven into the surrounding rock through its head, and its end is fixed to the steel plate strip segment (1).

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