A local sleeve arch reinforcing structure for mountain tunnel lining cracking

Abstract

The utility model relates to tunnel maintenance technical field especially a kind of local sleeve arch reinforcing structure for mountain tunnel lining cracking, including fixed groove, arc supporting plate and precast block, the fixed groove is set on the secondary lining of tunnel along tunnel longitudinal direction, the arc of the arc supporting plate is consistent with the arc of tunnel top, linear segment is provided at the both ends of arc supporting plate, the linear segment is fixed in the fixed groove, the arc supporting plate is equipped with accommodating space, the cross-sectional shape of precast block corresponds with the cross-sectional shape of accommodating space, precast block is fixedly connected with the arc supporting plate, and precast block fills accommodating space.Arc supporting plate and precast block can be produced in advance in factory, only need to open fixed groove on the secondary lining of both sides of tunnel in tunnel construction, simplify the cumbersome construction process, can greatly shorten the time of sleeve arch reinforcing technology construction.

Description

Technical Field

[0001] This utility model relates to the field of tunnel maintenance technology, and in particular to a local arch reinforcement structure for cracked lining of mountain tunnels. Background Technology

[0002] With the rapid development of transportation infrastructure in my country, the scale of tunnel construction has been continuously expanding, and the total mileage of operational tunnels is showing a rapid growth trend. Since tunnels are semi-concealed projects built in underground rock and soil media, they are affected by factors such as the operating environment, geological conditions, and design and construction levels. Many completed tunnels have developed defects and problems during operation, such as lining cracking, water leakage, and insufficient thickness, leading to reduced structural durability and load-bearing capacity, shortened service life, and in severe cases, even safety accidents with extremely adverse social impacts. my country's tunnel development is gradually entering a stage where construction and maintenance are equally important, and the reinforcement of cracked linings in in-service tunnels will face increasingly severe challenges. Commonly used structural reinforcement methods for in-service tunnels mainly include: anchor-sprayed mesh reinforcement, steel plate reinforcement, fiberboard reinforcement, and arch reinforcement. Among the many reinforcement methods, arch reinforcement, which adds a new concrete lining structure to the inner surface of the secondary lining, works together with the original secondary lining. It is the method with the most obvious advantages in improving lining strength and overall rigidity, and its application in engineering is also the most widespread.

[0003] Existing technologies disclose partial arch reinforcement techniques, which involve setting up a partial arch structure at the top of the tunnel. By setting straight sections at both ends of the curved section of the partial arch, the curvature difference between the straight sections and the secondary lining allows the secondary lining to be embedded at any position at both ends of the structure, effectively avoiding areas prone to intrusion. However, this existing technology requires extensive excavation along the circumference of the original lining to install reinforcing bars, erect grid arch frames, and finally construct formwork for cast-in-place concrete. The existing technology involves a cumbersome construction process, a long construction period, and significant traffic disruption. Utility Model Content

[0004] The main purpose of this utility model is to provide a partial arch reinforcement structure for cracking of the lining of mountain tunnels, so as to solve the technical problems of complicated construction process and long construction period of the partial arch structure in the prior art.

[0005] To achieve the above objectives, this utility model provides a partial arch reinforcement structure for cracked lining of mountain tunnels, including a fixing groove, an arc-shaped support plate, and precast blocks. The fixing groove is set along the longitudinal direction of the tunnel on the secondary lining of the tunnel. The arc of the arc-shaped support plate is consistent with the arc of the tunnel top. Straight segments are provided at both ends of the arc-shaped support plate, and the straight segments are fixed in the fixing groove. The arc-shaped support plate has an accommodating space. The cross-sectional shape of the precast blocks corresponds to the cross-sectional shape of the accommodating space. The precast blocks are fixedly connected to the arc-shaped support plate, and the precast blocks fill the accommodating space.

[0006] Furthermore, the arc-shaped support plate includes equally spaced protrusions that protrude into the tunnel, and the accommodating space is disposed between two adjacent protrusions.

[0007] More preferably, the precast block is an integral strip-shaped precast block, which extends along the accommodating space from one end of the arc-shaped support plate to the other end of the arc-shaped support plate.

[0008] More preferably, it also includes a drainage pipe, which is arranged circumferentially along the tunnel and fixed between the arc-shaped support plate and the secondary lining. The outlet of the drainage pipe is connected to the existing drainage ditch of the tunnel.

[0009] More preferably, the drain pipe is fixed to the bottom of the protrusion, and the drain pipe is connected to the existing drainage ditch of the tunnel along the protrusion.

[0010] Furthermore, it also includes a vertical groove, which is formed below the fixed groove and is connected to the fixed groove. A supporting steel frame is also provided in the vertical groove, and the supporting steel frame is fixedly connected to the arc-shaped support plate.

[0011] More preferably, multiple vertical grooves are provided, and the multiple vertical grooves are equally spaced along the longitudinal direction of the tunnel. The spacing between adjacent vertical grooves corresponds to the spacing of the accommodating space, and a supporting steel frame is provided in each of the multiple vertical grooves.

[0012] More preferably, the drainage pipe is connected to the existing drainage ditch of the tunnel through the vertical groove.

[0013] Preferably, the supporting steel frame is an I-beam, and a flange is fixed to the top of the I-beam, and the arc-shaped support plate is connected to the flange.

[0014] More preferably, it also includes two L-shaped connecting plates, which are arranged along the fixing groove, with the corners of the L-shaped connecting plates facing into the tunnel. The two ends of the arc-shaped support plate are fixed between the corners of the L-shaped connecting plates and the secondary lining. The L-shaped connecting plates are connected to the flange by bolts.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The arc-shaped support plate and precast blocks in this invention can be manufactured in the factory in advance. During tunnel construction, only fixing grooves need to be opened on the secondary lining on both sides of the tunnel to provide support and constraint for the arc-shaped support plate and precast blocks. This simplifies the complicated construction process, significantly shortens the construction time of the arch reinforcement technology, and reduces the impact of tunnel construction on traffic. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the tunnel partial arch reinforcement structure in one embodiment of the present invention;

[0019] Figure 2 This is a side view of the fixing groove and vertical groove on one side of the tunnel in one embodiment of the present invention;

[0020] Figure 3 This is a top view of the fixing groove and vertical groove on one side of the tunnel in one embodiment of the present invention;

[0021] Figure 4 This is a top view of the arc-shaped support plate and precast block in one embodiment of the present invention;

[0022] Figure 5 This is a top view schematic diagram of the connection between the arc-shaped support plate and the supporting steel frame in one embodiment of the present invention;

[0023] Figure 6 This is a front view schematic diagram of the connection between the arc-shaped support plate and the supporting steel frame in one embodiment of the present invention.

[0024] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0025] Explanation of icon numbers:

[0026] 1. Secondary lining; 2. Arc-shaped support plate; 3. Drainage ditch; 4. Fixing groove; 5. Vertical groove; 6. Supporting steel frame; 7. Precast block; 8. Protrusion; 9. L-shaped connecting plate; 10. Flange; A. Straight section. Detailed Implementation

[0027] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0030] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] Please see Figures 1 to 6 As shown, this embodiment provides a partial arch reinforcement structure for cracking of the lining of a mountain tunnel, including a fixing groove 4, an arc-shaped support plate 2, and a precast block 7. The fixing groove 4 is set along the longitudinal direction of the tunnel on the secondary lining 1 of the tunnel. The arc of the arc-shaped support plate 2 is consistent with the arc of the tunnel top. Straight segments A are provided at both ends of the arc-shaped support plate 2. The straight segments A are fixed in the fixing groove 4. The arc-shaped support plate 2 is provided with an accommodating space. The cross-sectional shape of the precast block 7 corresponds to the cross-sectional shape of the accommodating space. The precast block 7 is fixedly connected to the arc-shaped support plate 2 and fills the accommodating space.

[0032] Specifically, in this embodiment, the fixing groove 4 is opened at the shoulder of the secondary lining 1 of the tunnel, and the depth of the fixing groove 4 in the direction of the secondary lining 1 is 10cm.

[0033] In this embodiment, the arc-shaped support plate 2 is provided with a straight segment A. There is a curvature difference between the straight segment A and the secondary lining 1. Under the elastic force, the arc-shaped support plate 2 can be tightly attached to the surface of the secondary lining 1. The arc-shaped support plate 2 and the precast block 7 can be manufactured in the factory in advance. During tunnel construction, it is only necessary to open the fixing grooves 4 on the secondary lining 1 on both sides of the tunnel to provide support and constraint for the arc-shaped support plate 2 and the precast block 7. This simplifies the cumbersome construction process, significantly shortens the construction time of the arch-reinforcement technology, and thus reduces the impact of tunnel construction on traffic.

[0034] In this embodiment, the arc-shaped support plate 2 further includes equally spaced protrusions 8, which protrude into the tunnel, and the accommodating space is disposed between two adjacent protrusions 8. The protrusions 8 alter the stress state of the arc-shaped support plate 2 when supporting the secondary lining 1, allowing it to provide greater radial support force and thus ensuring the stability of this embodiment. Preferably, in this embodiment, the side of the arc-shaped support plate 2 facing the secondary lining 1 is planar and fits against the surface of the secondary lining 1. This not only expands the contact area of ​​the precast blocks 7 to improve their fixing ability but also increases the support area of ​​the arc-shaped support plate 2.

[0035] As a further preferred embodiment, the precast block 7 is an integral strip-shaped precast block, extending along the accommodating space from one end of the arc-shaped support plate 2 to the other end. In this embodiment, the precast block 7 is made of UHPC (ultra-high performance concrete) material. The precast block 7 is fixed to the side of the arc-shaped support plate 2 facing the tunnel. The integral structure is fixed along the accommodating space, which can improve the stability of the precast block 7 fixed to the top of the tunnel under elastic force. The precast block 7 set on the arc-shaped support plate 2 can further significantly improve the support capacity.

[0036] In one embodiment, a drainage pipe is also included. The drainage pipe is arranged circumferentially along the tunnel and fixed between the arc-shaped support plate 2 and the secondary lining 1, and also fixed to the bottom of the protrusion 8, which is the lowest point of the protrusion facing the tunnel. The drainage pipe connects to the existing drainage ditch 3 of the tunnel along the protrusion 8. Cracks in the secondary lining 1 can cause water leakage inside the tunnel. The drainage pipe collects the leaking water and discharges it along the arc-shaped support plate 2 into the existing drainage ditch 3 of the tunnel, preventing water accumulation inside the tunnel and thus avoiding safety accidents.

[0037] In this embodiment, a vertical groove 5 is further included. The vertical groove 5 is opened below the fixed groove 4 and is connected to the fixed groove 4. A supporting steel frame 6 is also provided in the vertical groove 5, and the supporting steel frame 6 is fixedly connected to the arc-shaped support plate 2.

[0038] Furthermore, multiple vertical grooves 5 are provided, and these grooves 5 are evenly spaced along the longitudinal direction of the tunnel. The spacing between adjacent vertical grooves 5 corresponds to the spacing of the accommodating space. Each vertical groove 5 is equipped with a supporting steel frame 6. The drainage pipe is connected to the existing drainage ditch 3 of the tunnel through the vertical grooves 5. The vertical grooves 5 not only facilitate the arrangement of the drainage pipe, but also provide support for the arc-shaped support plate 2 and the precast block 7 from both ends by embedding the supporting steel frame 6, further improving the support capability of this invention.

[0039] Specifically, the spacing between adjacent vertical grooves 5 is 50 to 100 cm, and the depth of the vertical grooves 5 towards the secondary lining 1 is 10 cm.

[0040] Preferably, the supporting steel frame 6 is an I-beam, specifically a 116 I-beam. A flange 10 is fixed to the top of the I-beam, and the arc-shaped support plate 2 is connected to the flange 10. I-beams are easy to procure and have strong vertical support capabilities. The connection between the flange 10 and the arc-shaped support plate 2 improves the stability of the connection.

[0041] Furthermore, it also includes two L-shaped connecting plates 9, which are arranged along the fixing groove 4, with the corners of the L-shaped connecting plates 9 facing into the tunnel. The two ends of the arc-shaped support plate 2 are fixed between the corners of the L-shaped connecting plates 9 and the secondary lining 1. The L-shaped connecting plates 9 are bolted to the flange 10. The L-shaped connecting plates 9 wrap around the two ends of the arc-shaped support plate 2, and the fixing of the L-shaped connecting plates 9 to the flange 10 can prevent the arc-shaped support plate 2 from sliding under elastic force, thereby further improving the support capacity of the arc-shaped support plate 2.

[0042] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A partial arch reinforcement structure for cracking in the lining of mountain tunnels, characterized in that, The system includes a fixing groove, an arc-shaped support plate, and precast blocks. The fixing groove is set along the longitudinal direction of the tunnel on the secondary lining of the tunnel. The arc-shaped support plate has the same curvature as the tunnel top. Straight sections are provided at both ends of the arc-shaped support plate and are fixed in the fixing groove. The arc-shaped support plate has an accommodating space. The cross-sectional shape of the precast blocks corresponds to the cross-sectional shape of the accommodating space. The precast blocks are fixedly connected to the arc-shaped support plate and fill the accommodating space.

2. The partial arch reinforcement structure according to claim 1, characterized in that, The arc-shaped support plate includes equally spaced protrusions that protrude into the tunnel, and the accommodating space is located between two adjacent protrusions.

3. The partial arch reinforcement structure according to claim 2, characterized in that, The precast block is an integral strip-shaped precast block, which extends along the accommodating space from one end of the arc-shaped support plate to the other end of the arc-shaped support plate.

4. The partial arch reinforcement structure according to claim 2, characterized in that, It also includes a drainage pipe, which is arranged circumferentially along the tunnel and fixed between the arc-shaped support plate and the secondary lining. The outlet of the drainage pipe is connected to the existing drainage ditch of the tunnel.

5. The partial arch reinforcement structure according to claim 4, characterized in that, The drain pipe is fixed to the bottom of the protrusion and connects to the existing drainage ditch of the tunnel along the protrusion.

6. The partially arched reinforcement structure according to claim 4 or 5, characterized in that, It also includes a vertical groove, which is formed below the fixed groove and is connected to the fixed groove. A supporting steel frame is also provided in the vertical groove, and the supporting steel frame is fixedly connected to the arc-shaped support plate.

7. The partial arch-reinforced structure according to claim 6, characterized in that, Multiple vertical slots are provided, and the multiple vertical slots are equally spaced along the longitudinal direction of the tunnel. The spacing between adjacent vertical slots corresponds to the spacing of the accommodating space. Each of the multiple vertical slots is equipped with a supporting steel frame.

8. The partial arch reinforcement structure according to claim 7, characterized in that, The drainage pipe is connected to the existing drainage ditch of the tunnel through the vertical channel.

9. The partially arched reinforcement structure according to claim 6, characterized in that, The supporting steel frame is an I-beam, and a flange is fixed to the top of the I-beam. The arc-shaped support plate is connected to the flange.

10. The partially arched reinforcement structure according to claim 9, characterized in that, It also includes two L-shaped connecting plates, which are arranged along the fixing groove. The corners of the L-shaped connecting plates face into the tunnel. The two ends of the arc-shaped support plate are fixed between the corners of the L-shaped connecting plates and the secondary lining. The L-shaped connecting plates are connected to the flange by bolts.

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