Magnetic attraction assembly type tunnel lining reinforcing structure

Abstract

The utility model discloses a magnetic attraction assembly type tunnel lining reinforcing structure which comprises a splicing type externally-attached steel plate assembly arranged on the outer surface of a tunnel lining reinforcing area, the externally-attached steel plate assembly is fixedly connected with the tunnel lining reinforcing area through a magnetic attraction base, and a filling gap is reserved between the tunnel lining reinforcing area and the externally-attached steel plate assembly. And a concrete layer is filled in the concrete layer to form a concrete reinforced structure. The device is simple in structure, low in cost and high in construction convenience, the magnetic attraction base is installed on the outer surface of a tunnel lining reinforcing area, the magnetic attraction base assists in installation and positioning of the externally-attached steel plate, and therefore the effect of rapidly installing the externally-attached steel plate is achieved, the externally-attached steel plate is used as a formwork for grouting and pressing construction of grout, and the construction efficiency is improved. The method can be used for reinforcing soft rock strata or repairing later tunnel deep-layer diseases in tunnel construction, and is wide in application range, controllable in construction risk, high in construction safety and reliable in structural function.

Description

Technical Field

[0001] The utility model relates to a magnetic adsorption and assembled tunnel lining reinforcement structure, belonging to the technical field of tunnel construction. Background Technique

[0002] Affected by multiple factors such as construction technology, engineering geology and hydrogeology conditions, the following problems exist in tunnel construction and later operation:

[0003] (1) During tunnel excavation, the surrounding rock undergoes large deformation. Especially in soft rock sections, the stability becomes worse. In severe cases, it will cause surface settlement, and further lead to serious damage to ground structures. In order to ensure the stability of tunnel excavation, it is very necessary to take certain pre-reinforcement measures. In the prior art, the pre-reinforcement measures commonly used in tunnel excavation are grouting, small conduits, positive bolt reinforcement measures, etc. These measures have problems such as being restricted by the geographical environment, complex construction methods, and low construction efficiency.

[0004] (2) As the operation time of the built tunnel increases, tunnel disease problems become increasingly prominent. Relatively common tunnel diseases include lining cracks, insufficient lining thickness, deterioration of lining materials, and cavities behind the lining, etc. The occurrence of the above diseases will seriously affect the normal operation of the tunnel. Improper treatment construction may induce accidents such as traffic safety and structural safety. At present, the reinforcement schemes for tunnel lining structures are subdivided into two categories. One is the outer structure reinforcement scheme such as steel strip reinforcement, anchor mesh shotcrete arch or steel frame arch, but the bearing capacity it can provide is relatively limited, and it cannot solve the water leakage problem induced by tunnel lining cracks; the other is the lining structure demolition and reconstruction scheme, which can effectively cure the concrete structure disease problems, but has many problems such as long treatment period, high repair cost, and high construction risk, and is generally not recommended for use.

[0005] It can be seen that the current reinforcement methods for tunnel construction and the methods for repairing structural diseases of tunnels are either too simple or too complex, so they cannot flexibly cope with the complex and diverse tunnel construction and later structural disease problems. In view of the above situation, it has great practical significance to study a magnetic adsorption and assembled tunnel lining reinforcement structure. Content of the Utility Model

[0006] In view of this, the purpose of the utility model is to provide a magnetic adsorption and assembled tunnel lining reinforcement structure to solve at least the problems mentioned in the background technique.

[0007] The purpose of the utility model is realized through the following technical solutions:

[0008] A magnetically assembled tunnel lining reinforcement structure comprises a magnetic base arranged in a tunnel lining reinforcement area, a spliced ​​external steel plate assembly covering the entire reinforcement area is connected to the magnetic base, and a filling gap is left between the tunnel lining reinforcement area and the external steel plate assembly, which is filled with a concrete layer to form a concrete reinforcement structure.

[0009] Furthermore, the tunnel lining is composed of concrete and a steel mesh arranged in the concrete, one end of the magnetic base is fixedly connected to the steel mesh, and the other end is magnetically connected to the external steel plate assembly.

[0010] Furthermore, the magnetic base is fixed to the steel mesh on the outer side of the tunnel lining reinforcement area structure at a certain circumferential spacing and longitudinal spacing, and is installed densely at the splicing position of the external steel plate assembly.

[0011] Furthermore, the magnetic base includes a welding part, a screw connecting part and a supporting part, one end of the screw connecting part is connected to the welding part, and the other end is connected to the supporting part, and a magnetic sheet is provided on the supporting part; the welding part is a U-shaped structure, and the arc portion of the U-shaped structure is adapted to the steel bars of the steel mesh, and is clamped on the steel bars of the steel mesh and welded to it.

[0012] Furthermore, the external steel plate assembly is provided with a plurality of grouting observation holes and grouting pipe reserved openings, the grouting observation holes are provided with high-strength transparent plastic plugs, and the grouting pipe reserved openings are arranged in the middle of the upper edge of the external steel plate assembly at the top of the tunnel lining reinforcement area.

[0013] Furthermore, the external steel plate assembly includes a plurality of steel plate units spliced ​​together, a magnetic fixing portion is provided in the middle of the steel plate unit, a bolt anchoring portion is provided on the outer periphery of the magnetic fixing portion, the steel plate unit is connected to the magnetic base through the magnetic fixing portion, and is directly anchored to the tunnel lining reinforcement area by chemical anchors through the bolt anchoring portion.

[0014] Furthermore, a steel plate overlap portion is provided on the side of the steel plate unit, a magnetic pad is provided inside the steel plate overlap portion, and adjacent steel plate units are magnetically connected in upper and lower layers through the steel plate overlap portion.

[0015] Furthermore, a plurality of protruding structures are provided on one side of the steel plate unit close to the magnetic base.

[0016] Furthermore, the protruding structure is a protruding screw.

[0017] Furthermore, the grouting observation holes are distributed on the magnetic fixing part at a certain interval and are staggered with the inner raised screw rod.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model has a simple structure, low cost and high construction convenience. A magnetic base is installed on the outer surface of the tunnel lining reinforcement area, and the installation and positioning of the externally bonded steel plate are assisted through the magnetic base, so as to achieve the effect of rapid installation of the externally bonded steel plate. The externally bonded steel plate is used as a formwork to press the grouting of the slurry during construction, which can be used for the reinforcement of soft rock strata in tunnel construction or the repair of deep tunnel diseases in the later stage. It has a wide range of applications, controllable construction risks, high construction safety and reliable structural functions.

[0020] Other advantages, objectives and features of the utility model will be described to some extent in the subsequent description, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be achieved and obtained through the following description. Brief Description of the Drawings

[0021] In order to make the objectives, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the drawings, where:

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the magnetic assembly type tunnel lining reinforcement structure provided by an embodiment of the utility model in the transverse direction;

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the magnetic assembly type tunnel lining reinforcement structure provided by an embodiment of the utility model in the vertical direction;

[0024] Figure 3 It is a construction state diagram of the utility model (steel plate unit not pasted);

[0025] Figure 4 It is a construction state diagram of the utility model (steel plate unit already pasted);

[0026] Figure 5 It is a schematic structure diagram of the magnetic base.

[0027] In the figure: 1. Externally bonded steel plate assembly; 1.1. Grouting observation hole; 1.2. Grouting pipe reserved port; 1.3. Steel plate unit; 1.3.1. Magnetic fixing part; 1.3.2. Bolt anchoring part; 1.3.3. Steel plate overlapping part; 1.4. Raised screw; 2. Magnetic base; 2.1. Welding part; 2.2. Screw connection part; 2.3. Supporting part; 2.4. Magnetic sheet; 3. Reinforcement mesh; 4. Transparent plastic plug; 5. Chemical anchor bolt; 6. Stress support structure; 7. Grouting pipe. Detailed Embodiment

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only partial embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0029] As Figure 1 shown, the first embodiment of the present utility model provides a magnetic adsorption and assembled tunnel lining reinforcement structure, which includes a magnetic adsorption base 2 arranged in the tunnel lining reinforcement area. A spliced external steel plate assembly 1 covering the entire reinforcement area is connected to the magnetic adsorption base 2. And a filling gap is left between the tunnel lining reinforcement area and the external steel plate assembly 1, and a concrete layer is filled therein, thereby forming a concrete reinforcement structure with reliable force bearing and effective waterproofing.

[0030] The tunnel lining is composed of concrete and a steel mesh arranged in the concrete. One end of the magnetic adsorption base 2 is fixedly connected to the steel mesh, and the other end is magnetically connected to the external steel plate assembly 1. Specifically, the magnetic adsorption base 2 is installed on the steel mesh 3 on the outer side of the tunnel lining reinforcement area structure by welding at a certain circumferential spacing and longitudinal spacing, and the installation should be appropriately densified at the splicing position of the external steel plate assembly 1. Specifically, the circumferential spacing of the magnetic adsorption base 2 arranged on the steel mesh 3 is not greater than 50 cm, and the longitudinal spacing is not greater than 300 cm. At the splicing position of the external steel plate assembly 1, the circumferential spacing of the magnetic adsorption base 2 arranged on the steel mesh 3 is not greater than 20 cm.

[0031] The magnetic adsorption base 2 includes a welding part 2.1, a screw connection part 2.2 and a supporting part 2.3. One end of the screw connection part 2.2 is connected to the welding part 2.1, and the other end is connected to the supporting part 2.3. A magnetic adsorption piece 2.4 is arranged on the supporting part 2.3. Among them, the welding part 2.1 is a U-shaped structure, and the arc part of the U-shaped structure is adapted to the steel bars of the steel mesh 3 and is clamped on the steel bars of the steel mesh 3 and welded and fixedly connected thereto. The length can be adjusted by rotating the screw connection part 2.2, thereby controlling the distance between the supporting part 2.3 and the steel mesh 3. The supporting part 2.3 can be welded or screwed to the screw of the screw connection part 2.2. The magnetic adsorption piece 2.4 arranged thereon can be used as a structure for magnetic adsorption connection with the external steel plate assembly 1. With the magnetic adsorption and fixing effect of the magnetic adsorption base 2, the external steel plate assembly 1 is assembled block by block from bottom to top in a split splicing manner. After the assembly is completed, the periphery of the external steel plate assembly 1 is anchored, and the external steel plate assembly 1 is completely anchored outside the tunnel lining reinforcement area.

[0032] The external steel plate assembly 1 is provided with a plurality of grouting observation holes 1.1 and grouting pipe reserved openings 1.2. The grouting observation holes 1.1 are provided with high-strength transparent plastic plugs 4. The transparent plastic plugs 4 can seal the grouting observation holes 1.1 and facilitate observation of the grouting height. The grouting pipe reserved openings 1.2 are arranged in the middle of the upper edge of the external steel plate assembly 1 at the top of the tunnel lining reinforcement area, and serve as a passage for the grouting pipe 7 to pass outside. After the grouting is completed, the grouting pipe 7 can pass through the grouting pipe reserved openings 1.3 of the external steel plate assembly 1, and can be subsequently closed by steel plate welding.

[0033] The externally attached steel plate assembly 1 includes a plurality of steel plate units 1.3 spliced ​​together, a magnetic fixing portion 1.3.1 is provided in the middle of the steel plate unit 1.3, a bolt anchoring portion 1.3.2 is provided on the outer periphery of the magnetic fixing portion 1.31, the steel plate unit 1.3 is connected to the magnetic base 2 through the magnetic fixing portion 1.3.1, and is directly anchored to the tunnel lining reinforcement area by a chemical anchor bolt 5 through the bolt anchoring portion 1.3.2. A steel plate overlap portion 1.3.3 is provided on the side of the steel plate unit 1.3, a magnetic pad is provided inside the steel plate overlap portion 1.3.3, and adjacent steel plate units 1.3 are magnetically connected in the upper and lower layers through the steel plate overlap portion 1.3.3.

[0034] The steel plate unit 1.3 is provided with a plurality of protruding structures on one side close to the magnetic base 2, and the protruding structures can be used as auxiliary structures to anchor the external steel plate assembly 1 in the subsequent slurry, and are used to improve the connection stability between the steel plate unit 1.3 and the concrete layer formed by subsequent grouting. The protruding structures can be protruding screws 1.4, which are fixedly connected to the steel plate unit 1.3 by welding.

[0035] The grouting observation holes 1.1 are distributed on the magnetic fixing part 1.3.1 at a certain interval and are staggered with the inner protruding screw rod 1.4. The high-strength transparent plastic plug is T-shaped and is plugged on the steel plate unit 1.3 from the inside to the outside, and can be fastened on the steel plate unit 1.3 under the grouting pressure.

[0036] Working principle and process of the device:

[0037] The device can be used for rapid deep repair of tunnel diseases. The specific construction steps are as follows:

[0038] s1-1. Demolish and treat defective areas according to the specific conditions of the concrete structure;

[0039] s1-2, arranging the steel mesh 3 in the demolition area, and installing the grouting pipe 7 and the magnetic base 2 on the steel mesh 3;

[0040] s1-3, using the magnetic base 2 and the block splicing method, quickly install the external steel plate assembly 1 on the outer surface of the concrete demolition area from bottom to top;

[0041] After the external steel plate assembly 1 is installed, a force-bearing support structure 6 is applied to its outside; the force-bearing support structure 6 can be a support trolley, a lifting support frame, etc.

[0042] s1-5. Carry out slurry grouting injection construction by means of the pre-set grouting pipe 7 to densely fill the defective area behind the external steel plate assembly 1, thereby forming a concrete repair structure with reliable force-bearing and effective waterproofing.

[0043] The injected slurry adopts new grouting materials with excellent compressive and bonding properties such as polymer cement waterproof mortar.

[0044] In addition, this device can also be used for tunnel construction with soft rock strata, and the specific construction steps are as follows:

[0045] s2-1. When the tunnel construction reaches the area with soft rock strata, complete the construction of the steel mesh in the tunnel lining reinforcement area according to the existing tunnel construction technology, and arrange the retractable grouting pipe 7 on the steel mesh.

[0046] s2-2. Install the magnetic base 2 on the outer steel mesh sheet 3 in a welded form at a certain circumferential spacing and longitudinal spacing. With the assistance of the magnetic sheet of the magnetic base 2, splice the lower-layer external steel plate assembly 1, ensuring that the lower-layer external steel plate assembly 1 can completely cover the tunnel lining reinforcement area and have sufficient redundant anchorage space. After splicing, flexibly adjust the position of the external steel plate assembly 1 to make it regularly cover the entire lower-layer lining area, and then fix the bolt anchorage part 1.3.2 of the external steel plate assembly through the chemical anchor bolt 5, so that the lower-layer external steel plate assembly 1 is completely fixed on the concrete lining structure.

[0047] s2-3. On the basis of the lower-layer external steel plate assembly 1, install the external steel plate assembly 1 in an orderly manner from bottom to top, and finally make the entire tunnel lining reinforcement area completely covered with the external steel plate assembly 1.

[0048] s2-4. After the external steel plate assembly 1 is installed, a force-bearing support structure 6 is applied to its outside; the force-bearing support structure 6 can be a support trolley, a lifting support frame, etc.

[0049] s2-5. Carry out slurry grouting injection construction by means of the set grouting pipe 7. After the grouting is completed, draw out the grouting pipe 7, and fill the area behind the external steel plate assembly 1 through grouting to form a concrete reinforcement structure with reliable force-bearing and effective waterproofing.

[0050] The above are only the preferred embodiments of the present utility model, and do not impose any form of confidentiality restrictions on the present utility model. Any simple modifications, equivalent changes, and decorations made to the above embodiments without departing from the content of the technical solution of the present utility model and based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A magnetically assembled tunnel lining reinforcement structure, characterized in that: The invention comprises a magnetic base (2) arranged in a tunnel lining reinforcement area, the magnetic base (2) being connected to a spliced ​​external steel plate assembly (1) covering the entire reinforcement area, and a filling gap being left between the tunnel lining reinforcement area and the external steel plate assembly (1), the gap being filled with a concrete layer, thereby forming a concrete reinforcement structure.

2. The magnetic assembled tunnel lining reinforcement structure according to claim 1 is characterized in that: The tunnel lining is composed of concrete and a steel mesh sheet arranged in the concrete. One end of the magnetic base (2) is fixedly connected to the steel mesh sheet, and the other end is magnetically connected to the external steel plate assembly (1).

3. The magnetic assembled tunnel lining reinforcement structure according to claim 2 is characterized in that: The magnetic base (2) is fixed to the steel mesh (3) on the outer side of the tunnel lining reinforcement area structure at a certain circumferential spacing and longitudinal spacing, and is densely installed at the splicing position of the external steel plate assembly (1).

4. The magnetic assembled tunnel lining reinforcement structure according to claim 3 is characterized in that: The magnetic base (2) comprises a welding portion (2.1), a screw connection portion (2.2) and a supporting portion (2.3); one end of the screw connection portion (2.2) is connected to the welding portion (2.1), and the other end is connected to the supporting portion (2.3); a magnetic sheet (2.4) is provided on the supporting portion (2.3); the welding portion (2.1) is a U-shaped structure; the arc portion of the U-shaped structure is adapted to the steel bars of the steel mesh (3), and is clamped on the steel bars of the steel mesh (3) and welded to the steel bars.

5. The magnetic assembled tunnel lining reinforcement structure according to any one of claims 1 to 4, characterized in that: The external steel plate assembly (1) is provided with a plurality of grouting observation holes (1.1) and grouting pipe reserved openings (1.2), the grouting observation holes (1.1) are provided with high-strength transparent plastic plugs (4), and the grouting pipe reserved openings (1.2) are arranged in the middle of the upper edge of the external steel plate assembly (1) at the top of the tunnel lining reinforcement area.

6. The magnetically assembled tunnel lining reinforcement structure according to claim 5 is characterized in that: The externally attached steel plate assembly (1) comprises a plurality of steel plate units (1.3) spliced ​​together, a magnetic fixing portion (1.3.1) being provided in the middle of the steel plate unit (1.3), a bolt anchoring portion (1.3.2) being provided on the outer periphery of the magnetic fixing portion (1.3.1), the steel plate unit (1.3) being connected to the magnetic base (2) via the magnetic fixing portion (1.3.1), and being directly anchored to the tunnel lining reinforcement area by chemical anchor bolts (5) via the bolt anchoring portion (1.3.2).

7. The magnetically assembled tunnel lining reinforcement structure according to claim 6 is characterized in that: A steel plate overlap portion (1.3.3) is provided on the side of the steel plate unit (1.3), a magnetic pad is provided inside the steel plate overlap portion (1.3.3), and adjacent steel plate units (1.3) are magnetically connected in upper and lower layers via the steel plate overlap portion (1.3.3).

8. The magnetically assembled tunnel lining reinforcement structure according to claim 7 is characterized in that: The steel plate unit (1.3) is provided with a plurality of protruding structures on one side close to the magnetic base (2).

9. The magnetically assembled tunnel lining reinforcement structure according to claim 8 is characterized in that: The protruding structure is a protruding screw rod (1.4).

10. The magnetic assembled tunnel lining reinforcement structure according to claim 9, characterized in that: The grouting observation holes (1.1) are distributed on the magnetic fixing part (1.3.1) at a certain interval and are staggered with the inner raised screw rod (1.4).

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