Construction method and construction structure for reinforcing existing line tunnel lining based on reinforcing plates

Abstract

The invention relates to a construction method and a construction structure for reinforcing an existing line tunnel lining based on a reinforcing plate, and the method comprises the following steps: locally chiseling off concrete at the position of an existing secondary lining wall foot to form a plurality of tunnel wall foot grooves which are annularly arranged; the profile steel keel foundation is placed into the cable trough, and the lower portion of each profile steel frame is transversely inserted into a tunnel wall foot groove; longitudinal connecting pipes are used for longitudinally connecting the profile steel frames from the maximum span to the arch crown range; reinforced longitudinal connection is conducted on the profile steel frames in the side wall range through the longitudinal connection channel steel; arc-shaped reinforcing plates are connected to the inner sides of the outer flanges of the adjacent profile steel frames, and reinforcing meshes are arranged on the inner sides of the reinforcing plates in advance; and concrete is poured between the section steel frames on the inner sides of the reinforcing plates. The reinforcing component is high in strength, the safety of the existing tunnel structure can be greatly improved, and the improvement effect is good; the reinforcing plate can be used as an inner mold for reinforcing the cover arch and can also be reserved as a permanent structure, and the construction method is obviously simplified.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel construction, and in particular to a construction method and a construction structure based on reinforcing plates to reinforce the lining of an existing tunnel. Background Art

[0002] During the service life of the tunnel, due to the influence of special and complex environment and the increase of tunnel service life, many tunnel diseases will gradually appear. If there are construction defects such as voids behind the lining, insufficient lining thickness, over-excavation, loose backfill, etc. during the construction stage, tunnel diseases will occur more quickly. Under the influence of train loads and natural environmental factors, lining cracks, cracks and falling blocks will appear, which will reduce the safety and stability of the tunnel structure and seriously endanger the safety of vehicle operations.

[0003] At present, the lining crack damage is often repaired and reinforced by grouting, anchor reinforcement, replacement, and sleeve lining. Among them, grouting and anchor reinforcement are suitable for general cracks, and the reinforcement effect is not ideal; replacement and sleeve lining have good repair effects, but they need to be constructed using a special lining trolley and carried out by a professional team. The construction process is demanding, and it is necessary to interrupt operations, close the line, and take a long time, which has a great impact on tunnel traffic.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned defects. Summary of the invention

[0005] The purpose of the present invention is to provide a construction method and a construction structure for reinforcing the lining of an existing tunnel based on a reinforcement plate, so as to solve the problems that the current reinforcement means have unsatisfactory effects and high construction process requirements.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A construction method for reinforcing an existing tunnel lining based on a reinforcement plate, the method comprising:

[0008] Partially remove the concrete at the foot of the existing secondary lining wall to form multiple annular tunnel wall foot grooves;

[0009] Use steel frame to build steel keel close to tunnel lining;

[0010] Place the steel keel foundation into the cable trough, and insert the lower part of each steel frame horizontally into the tunnel wall foot groove;

[0011] Drive foot-locking anchor rods into the surrounding rock at the foundation of the steel keel;

[0012] Use longitudinal connecting pipes to longitudinally connect the steel frames with the maximum span to the arch range;

[0013] Use longitudinal connecting channel steel to strengthen the longitudinal connection of the steel frame in the side wall range;

[0014] Connect the arc-shaped reinforcement plate to the inner side of the outer flange of the adjacent steel frame, and set the steel mesh inside the reinforcement plate in advance;

[0015] Pour concrete between the steel frames on the inner side of the reinforcement plate;

[0016] Grouting holes are reserved on the reinforcement plate of the arch and hollow grouting anchors are installed.

[0017] Furthermore, after partially chiseling away the concrete at the foot of the existing second lining wall, temporary arch reinforcement and protection are set on the longitudinal front and rear sides of the chiseled away position.

[0018] Furthermore, before constructing the steel keel, the surface of the tunnel lining is roughened, cleaned, and then coated with a concrete interface agent.

[0019] Furthermore, when constructing the steel keel, a steel pad is inserted between the steel frame and the tunnel lining.

[0020] Furthermore, the steel frame is composed of a plurality of circumferential arc-shaped steel sections, each end of each arc-shaped steel section is provided with a steel frame connecting end plate, and adjacent steel frame connecting end plates are connected by bolts.

[0021] Furthermore, embedded reinforcement bars are arranged on the side walls on both sides of the tunnel lining, and the ends of the embedded reinforcement bars are connected to the steel frame.

[0022] Furthermore, the longitudinal connecting pipe is used to longitudinally connect the steel frame with the maximum span to the vault, including:

[0023] Longitudinal holes are arranged on the webs of the section steel frames, and longitudinal connecting pipes are inserted into all the section steel frames in sequence to connect the section steel frames longitudinally.

[0024] Furthermore, longitudinal connection channels are used to strengthen the longitudinal connection of the steel frame in the side wall range, including:

[0025] Longitudinal connecting channels are welded on the outer flanges of all steel frames to strengthen the longitudinal connection of the steel frames.

[0026] On the other hand, a construction structure for reinforcing an existing tunnel lining based on a reinforcement plate is provided, wherein the structure is constructed by the method described and comprises a steel frame, a reinforcement plate and a steel mesh;

[0027] The steel frame is arranged in a ring close to the tunnel lining. Steel mesh and reinforcement plates are arranged between the adjacent steel frames in the longitudinal direction. The steel mesh is welded and fixed to the web of the steel frame, and the reinforcement plate is fixed to the inner side of the outer flange of the steel frame by high-strength bolts.

[0028] Concrete is poured between the inner side of the reinforcement plate and the tunnel lining.

[0029] Furthermore, the steel mesh includes longitudinal steel bars and circumferential steel bars, the longitudinal steel bars are welded to the web of the steel frame, and the circumferential steel bars are welded to the longitudinal steel bars.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention provides a construction method and a construction structure for reinforcing the existing tunnel lining based on a reinforcement plate. The existing tunnel lining is reinforced by using the steel concrete principle. The construction is convenient and quick, with little impact on driving. The reinforced components have high strength, which can greatly improve the safety of the existing tunnel structure and have a good remediation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the construction structure of the present invention.

[0034] Figure 2 It is a schematic diagram of the reinforcement plate arrangement.

[0035] Figure 3 It is a side view of the construction structure of the present invention.

[0036] Figure 4 It is a schematic diagram of the connection between adjacent steel frames.

[0037] Figure 5 This is a schematic diagram of the installation of the longitudinal connecting pipe.

[0038] The symbols in the figure are:

[0039] 1-steel frame, 2-reinforcement plate, 3-high-strength bolts, 4-longitudinal reinforcement, 5-circumferential reinforcement, 6-cast concrete, 7-longitudinal connecting channel steel, 8-locking anchor rod, 9-steel keel foundation, 10-steel frame fixing reinforcement, 11-hollow grouting anchor rod, 12-longitudinal connecting pipe, 13-steel frame connecting end plate, 14-cable trough, 15-anchor hole. DETAILED DESCRIPTION

[0040] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0041] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “top”, “bottom”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply 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.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connection", "setting", etc. should be understood in a broad sense, for example, it can be fixed connection, setting, or detachable connection, setting, or integral connection, setting. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and this should not be construed as a limitation on the order of the steps.

[0044] The present invention provides a construction method for reinforcing an existing tunnel lining by using a reinforcement plate, and the method specifically comprises the following steps:

[0045] Before construction, the cables and other equipment within the reinforcement range are temporarily relocated and protected. Then the reinforcement construction begins.

[0046] S1: Partially remove the concrete at the foot of the existing secondary lining wall to form multiple annular tunnel wall foot grooves. Ensure that the width of the steel frame bottom foundation is 20cm.

[0047] After partially chiseling away the concrete at the foot of the existing secondary lining wall, it is necessary to set up temporary arch reinforcement and protection on the longitudinal front and rear sides of the chiseled-away position if necessary, such as setting diagonal braces at the foot of the wall, or setting up arches along the surface of the lining structure for reinforcement to prevent the lining structure from becoming unstable when chiseling away the concrete at the foot of the wall.

[0048] When chiseling away the concrete at the foot of the existing lining wall, the height of the chiseling away can be appropriately adjusted according to the on-site construction process requirements. The longitudinal width of the chiseled away at the foot of the existing secondary lining wall should be consistent with the length of the segmented casting of the lining. It is strictly forbidden to chisel away all the reinforced sections at one time. If necessary, temporary arches should be added at both ends of the chiseled away section of the existing lining wall to ensure safety.

[0049] S2: Use the steel frame 1 to build the steel keel close to the tunnel lining.

[0050] Before constructing the steel keel, the surface of the tunnel lining is roughened, cleaned and then coated with concrete interface agent. Concrete interface agent is a polymer-modified cement mortar with super strong adhesion, excellent water resistance and aging resistance. It can improve the durability of existing concrete and enhance the adhesion between existing concrete and reinforced components. In addition, the existing tunnel profile should be measured and scanned according to requirements.

[0051] When constructing the steel keel, a steel pad is inserted between the steel frame 1 and the tunnel lining.

[0052] The steel frame 1 is made of H150 steel with a spacing of 1.0m. It is composed of multiple sections of arc-shaped steel spliced ​​in an annular direction. A steel frame connecting end plate 13 is welded to the end of each section of the arc-shaped steel. Adjacent steel frame connecting end plates 13 are connected by bolts.

[0053] Before the construction of the steel frame 1, the inner contour of the existing tunnel is measured at 2m intervals, the inner contour diagram is drawn in proportion and construction layout is carried out to check whether the inner contour meets the limit and power supply equipment insulation requirements after the reinforcement structure is constructed.

[0054] S3: Place the steel keel foundation 9 into the cable trough 14, and insert the lower part of each steel frame 1 horizontally into the tunnel wall foot groove.

[0055] Planting bars are arranged on the side walls on both sides of the tunnel lining, and the ends of the planting bars are connected to the steel frame 1. The exposed tail of the planting bar is processed into a straight hook and welded to the steel frame as a whole.

[0056] S4: Drive locking anchor rods 8 into the surrounding rock at the steel keel foundation 9. Use R32N locking anchor rods and drive them to the depth of the invert structure layer to ensure the stability of the foundation.

[0057] S5: Use the longitudinal connecting pipe 12 (φ42) to longitudinally connect the steel frames 1 with the maximum span up to the arch. Specifically, longitudinal holes are set on the webs of the steel frames 1, and the longitudinal connecting pipe 12 is inserted into all the steel frames 1 in sequence to longitudinally connect the steel frames 1.

[0058] S6: Use longitudinal connecting channel steel 7 (20a channel steel) to strengthen the longitudinal connection of the steel frame 1 in the side wall range. Specifically, weld the longitudinal connecting channel steel 7 on the outer flanges of all the steel frames 1 to strengthen the longitudinal connection of the steel frames 1.

[0059] S7: Connect the arc-shaped reinforcing plate 2 to the inner side of the outer flange of the adjacent steel frame 1, and set a steel mesh inside the reinforcing plate 2 in advance.

[0060] The steel plate of the reinforcing plate 2 is 98 cm long and 60 cm wide in the circumferential direction. The steel plate is bent according to the curvature of the steel arch frame on site.

[0061] S8: pouring concrete between the steel frames 1 inside the reinforcing plate 2. Specifically, bolting the reinforcing plate 2 inside the outer edge of the steel frame 1 in sections from bottom to top and pouring C40 self-compacting concrete to fill the space between the steel frames 1.

[0062] S9: reserve grouting holes on the reinforcing plate 2 of the arch and install hollow grouting anchor rods 11, and fill the holes with grouting to make them dense.

[0063] Finally, the exposed steel components are derusted and polished, and then sprayed with protective paint.

[0064] The construction structure constructed by the above construction method is a reinforced sleeve arch structure, including a steel frame 1, a reinforcing plate 2 and a steel mesh. The steel frame 1 is arranged in a ring close to the tunnel lining, and a steel mesh and a reinforcing plate 2 are arranged between the longitudinally adjacent steel frames 1. The steel mesh is welded and fixed to the web of the steel frame 1, and the reinforcing plate 2 is fixed to the inner side of the outer flange of the steel frame 1 by high-strength bolts 3. Concrete is poured between the inner side of the reinforcing plate 2 and the tunnel lining.

[0065] The steel mesh includes longitudinal steel bars 4 and circumferential steel bars 5 (Φ12), the longitudinal steel bars 4 are welded to the web of the steel frame 1, and the circumferential steel bars 5 are welded to the longitudinal steel bars 4.

[0066] The invention is convenient and quick to construct, has little impact on driving, and has high strength of reinforced components, which can greatly improve the safety of existing tunnel structures and have good remediation effects. In the final structure, the reinforcing plate 2 can be used as an inner mold for reinforcing the sleeve arch, or can be retained as a permanent structure, and the construction method is significantly simplified.

[0067] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A construction method for reinforcing an existing tunnel lining with a reinforcement plate, characterized in that: The method comprises: Partially remove the concrete at the foot of the existing secondary lining wall to form multiple annular tunnel wall foot grooves; Using the steel frame (1) to closely adhere to the tunnel lining to construct the steel keel; The steel keel foundation (9) is placed in the cable trough (14), and the lower part of each steel frame (1) is inserted horizontally into the tunnel wall foot groove; A locking anchor rod (8) is driven into the surrounding rock at the steel keel foundation (9); The longitudinal connecting pipe (12) is used to longitudinally connect the steel frame (1) with the maximum span reaching the vault; The longitudinal connection of the steel frame (1) in the side wall range is strengthened by using longitudinal connection channel steel (7); Connecting an arc-shaped reinforcing plate (2) to the inner side of the outer flange of the adjacent steel frame (1), and setting a steel mesh inside the reinforcing plate (2) in advance; Pouring concrete between the steel frames (1) on the inner side of the reinforcing plate (2); Grouting holes are reserved on the reinforcement plate (2) of the arch and hollow grouting anchor rods (11) are installed.

2. The construction method for reinforcing the existing tunnel lining based on the reinforcement plate according to claim 1 is characterized by: After partially chiseling away the concrete at the foot of the existing second lining wall, temporary arch reinforcement and protection are set up on the longitudinal front and rear sides of the chiseled away position.

3. The construction method for reinforcing the existing tunnel lining based on the reinforcement plate according to claim 2 is characterized in that: Before constructing the steel keel, the surface of the tunnel lining is roughened, cleaned and then coated with concrete interface agent.

4. The construction method for reinforcing the existing tunnel lining by using a reinforcement plate according to claim 3 is characterized in that: When constructing the profiled steel keel, a steel pad is inserted between the profiled steel frame (1) and the tunnel lining.

5. The construction method for reinforcing the existing tunnel lining by using a reinforcement plate according to claim 4 is characterized in that: The steel frame (1) is composed of a plurality of circumferential arc-shaped steel sections spliced ​​together, each end of the arc-shaped steel section is provided with a steel frame connecting end plate (13), and adjacent steel frame connecting end plates (13) are connected by bolts.

6. The construction method for reinforcing the existing tunnel lining by using a reinforcement plate according to claim 5 is characterized in that: Embedded reinforcement bars are arranged on the side walls on both sides of the tunnel lining, and the ends of the embedded reinforcement bars are connected to the section steel frame (1).

7. The construction method for reinforcing the existing tunnel lining by using a reinforcement plate according to claim 6 is characterized in that: The longitudinal connection pipe (12) is used to longitudinally connect the steel frame (1) with the maximum span to the vault, including: Longitudinal holes are arranged on the webs of the section steel frames (1), and longitudinal connecting pipes (12) are sequentially inserted into all the section steel frames (1) to connect the section steel frames (1) longitudinally.

8. The construction method for reinforcing the existing tunnel lining by using a reinforcement plate according to claim 7 is characterized in that: The longitudinal connection channel steel (7) is used to strengthen the longitudinal connection of the steel frame (1) in the side wall range, including: Longitudinal connection channel steels (7) are welded on the outer flanges of all the section steel frames (1) to strengthen the longitudinal connection of the section steel frames (1).

9. A construction structure based on reinforcing plates to reinforce the existing tunnel lining, characterized in that: The structure is constructed by the method of claim 8, comprising a steel frame (1), a reinforcing plate (2) and a steel mesh; The steel frame (1) is arranged in a ring close to the tunnel lining, and a steel mesh and a reinforcing plate (2) are arranged between the longitudinally adjacent steel frames (1). The steel mesh is welded and fixed to the web of the steel frame (1), and the reinforcing plate (2) is fixed to the inner side of the outer flange of the steel frame (1) by high-strength bolts (3); Concrete is poured between the inner side of the reinforcement plate (2) and the tunnel lining.

10. The construction structure based on reinforcing plate to reinforce existing tunnel lining according to claim 9 is characterized in that: The steel mesh comprises longitudinal steel bars (4) and circumferential steel bars (5), wherein the longitudinal steel bars (4) are welded to the web of the steel frame (1), and the circumferential steel bars (5) are welded to the longitudinal steel bars (4).

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