Novel reinforced concrete defect repairing structure

Abstract

The utility model provides a novel reinforced concrete defect repairing structure, which aims at a tunnel in which defects of a reinforced concrete lining are large and are difficult to process and secondary damage is possible to process according to a conventional scheme, and comprises a steel lining and a grouting pipe, steel pipe joints are arranged between the steel pipes and are connected in an annular welding mode, a grout inlet and a grout outlet of the grouting pipe are led out of the first section of steel pipe and the tail section of steel pipe respectively, and a plurality of open holes are formed in the middle section of the grouting pipe. The utility model has the advantages that the original defective concrete lining section is directly replaced by the steel lining, a practical, effective and enforceable repairing scheme which occupies a small area on the concrete section is provided, and the secondary damage to the project caused by the secondary damage of the conventional defect repairing scheme is not needed to be worried.

Description

Technical Field

[0001] The utility model relates to the technical field of reinforced concrete lining, in particular to a novel reinforced concrete defect repairing structure. Background Art

[0002] The tunnels of the water transmission system often adopt the structure of reinforced concrete lining. During the construction period or operation and maintenance period, there may be problems with concrete structure defects, such as honeycomb surface, severe cracking causing block falling, large area holes, etc. When encountering the above problems, the defects must be dealt with, otherwise it will not only cause large-scale water leakage and mountain leakage, but also cause slope safety problems and even unit damage, causing immeasurable losses to the hydropower station. Therefore, properly handling tunnel lining defects is an important guarantee for the normal operation of the hydropower station.

[0003] For tunnels with defects in the local lining with a small impact range and low water flow rate during operation, epoxy materials can usually be considered for repair. For tunnel sections with large defects that may still be damaged by conventional methods, it is possible to consider removing the entire section of reinforced concrete and re-pour, but the impact range may be larger; it is also possible to consider using a steel lining to wrap the defective tunnel section to make the concrete lining become a steel pipe lining, avoiding the problem of the defective part falling off again during ordinary epoxy repair measures. The steel lining repair plan makes the tunnel section become a watertight structure such as steel lining, reducing the possibility of internal water infiltration, and also reducing the head loss of the entire tunnel section, ensuring the quality of the tunnel lining repair. Utility Model Content

[0004] The utility model aims to provide a novel reinforced concrete defect repair structure which is practical, effective, feasible and has less invasion of concrete section.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0006] A new reinforced concrete defect repair structure is designed for tunnels where the reinforced concrete lining defects are large and difficult to handle and where conventional solutions may result in secondary damage. The structure includes a steel lining and a grouting pipe. The steel lining is composed of a plurality of steel pipe sections. Steel pipe sections are provided between the steel pipes and are connected in a circular welding form. The first and last steel pipe sections lead out the grouting pipe's grouting inlet and grouting outlet respectively, and the grouting pipe has a plurality of openings in the middle section.

[0007] Furthermore, the steel lining is connected and fixed to the defective part of the lining through a plurality of stiffening rings.

[0008] Furthermore, the stiffening ring is arranged in an annular groove of the stiffening ring, and the annular groove of the stiffening ring is pre-drilled at the defective part of the lining.

[0009] Furthermore, the grouting pipe is arranged in a longitudinal grouting groove, the longitudinal grouting groove is pre-drilled at the defective part of the lining, and the grouting pipe is bonded to the bottom of the groove through an iron sheet hoop.

[0010] Furthermore, the grouting pipe comprises a head end grouting pipe, a middle section of the grouting pipe and a tail end grouting pipe which are connected in sequence.

[0011] Furthermore, each section of the steel pipe is divided into a number of tiles, and the tiles are spliced ​​and installed in the tunnel, and longitudinal welds and circumferential welds are formed between the tiles.

[0012] Furthermore, a back plate is pre-welded on the back of the tile to facilitate assembly of adjacent tiles.

[0013] Furthermore, the stiffening ring is provided with a grouting hole to facilitate the passage of the grouting pipe.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] The utility model discloses a novel reinforced concrete defect repair structure, which directly replaces the original defective concrete lining section with a steel lining, and provides a practical and effective repair scheme that occupies less concrete section, without worrying about secondary damage to the project due to re-destruction of conventional defect repair schemes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic longitudinal section diagram of the steel lining repair of the utility model.

[0017] Figure 2 yes Figure 1 Schematic diagram of the cross section at 1-1 of the starting end of the steel lining repair grouting.

[0018] Figure 3 yes Figure 1 Schematic diagram of the cross section at 2-2 at the tail end of the steel lining repair grouting.

[0019] Figure 4 It is a cross-sectional schematic diagram of the grouting arrangement of the utility model.

[0020] Figure 5 It is a schematic cross-sectional view of section 3-3 of the present invention.

[0021] Figure 6 It is an enlarged schematic diagram of the stiffening ring structure of the utility model.

[0022] Figure 7 It is a schematic diagram of the grouting pipe structure of the utility model.

[0023] Figure numerals: 1, steel pipe; 11, pipe section; 12, grouting hole; 13, stiffening ring; 14, grouting hole; 15, tile; 151, back plate; 16, longitudinal weld; 17, circumferential weld; 2, grouting pipe; 21, head end grouting pipe; 22, middle section of grouting pipe; 23, tail end grouting pipe; 24, opening; 3, concrete lining; 4, construction joint water stop; 5, stiffening ring annular groove; 6, longitudinal grouting groove; 7, iron sheet hoop; 8, adhesive; DETAILED DESCRIPTION

[0024] The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 4 As shown, a new type of reinforced concrete defect repair structure is designed for tunnels where the reinforced concrete lining defects are large and difficult to handle and conventional solutions may cause secondary damage. It includes a steel lining and a grouting pipe 2. The steel lining is composed of a plurality of steel pipe sections 1, and the steel pipe 1 is connected on site by a steel pipe section 11 in the form of a ring welding. The first section and the last section of the steel pipe section 11 respectively lead out the grouting inlet and the grouting outlet of the grouting pipe 2. The grouting pipe 2 includes a first end grouting pipe 21, a grouting pipe middle section 22 and a tail end grouting pipe 23 connected in sequence. The grouting pipe middle section 22 is provided with a plurality of openings 24. The first end grouting pipe 21 and the tail end grouting pipe 23 are both made of PE pipes and are respectively led out from the grouting holes 12 of the first section and the last section of the steel pipe section 11.

[0026] In actual situations, the length of the pipe section of the steel pipe 1 should be determined by considering the length produced by the steel manufacturer and the mechanical capacity of the installation support. The thickness of the steel pipe 1 is determined by calculating the design resistance to external and internal pressures, and a stiffening ring 13 is provided according to the design requirements, and a grouting hole 14 is provided on the stiffening ring 13. The grouting hole 14 is a semicircular hole punched in the stiffening ring 13 close to the outer wall of the steel pipe 1, which is convenient for the grouting pipe 2 to pass through and for the grouting to flow freely through the stiffening ring 13; if there is no grouting hole 14, the grouting cannot flow freely outside the steel pipe 1, resulting in the grouting not being able to fully cover. Each section of the steel pipe segment 11 is welded on site by a number of fan-shaped tiles 15. The size of each tile 15 should be determined based on the mechanical capacity of the installation support. The tiles 15 are spliced ​​and installed in the tunnel. The tiles 15 are connected to form a pipe segment 11 by a longitudinal weld 16, and the pipe segment 11 is used to form a steel pipe 1 by a circumferential weld 17. That is, the tiles 15 are connected to each other by longitudinal welding, and the pipe segments 11 are connected to each other by circumferential welding. The longitudinal welds 16 between adjacent pipe segments 11 should be staggered.

[0027] Preferably, a back plate 151 is welded to the back of the tile 15 to facilitate better assembly of adjacent tiles 15 and ensure the quality of single-sided welding.

[0028] The outer side of the steel lining is a defective part of the concrete lining 3 , and a construction joint water stop 4 is arranged inside the concrete lining 3 .

[0029] like Figures 2~4 As shown in the figure, 60︒ and 100︒ are marked. Taking 100︒ as an example, it means that there is a tile from 55︒ to the left of the bottom to 45︒ to the right of the bottom; t is the steel lining thickness, Ds is the inner diameter of the steel pipe, Dc is the outer diameter of the steel pipe, and y is the commonly used rock excavation line symbol.

[0030] Preferably, if Figure 5 , 6 As shown, the steel lining is connected and fixed to the defective part of the lining by a plurality of stiffening rings 13, and the stiffening rings 13 are arranged in the stiffening ring annular grooves 5, and the stiffening ring annular grooves 5 are pre-drilled at the defective part of the lining.

[0031] Preferably, if Figure 7 As shown, the grouting pipe 2 is arranged in the longitudinal grouting groove 6, and the longitudinal grouting groove 6 is pre-drilled at the defective part of the lining. The grouting pipe 2 is bonded to the bottom of the groove through several iron hoops 7, and the adhesive 8 adopts a fast-setting epoxy adhesive.

[0032] The annular groove 5 of the stiffening ring and the longitudinal grouting groove 6 may intersect and do not need to be staggered, nor can they be staggered.

[0033] The reinforced concrete defect repair structure of the utility model adopts grouting to seal the gap between the steel lining and the lining, and finally completes the repair. The specific operation steps are as follows:

[0034] S1) First, repair the defective parts of the lining with conventional concrete and mortar;

[0035] S2) For defective lining tunnel sections, a stiffening ring annular groove 5 is chiseled out according to design requirements to fit the stiffening ring 13. The thickness of the protective layer of the original reinforced concrete must be considered during design, and the height of the stiffening ring 13 must not be greater than the thickness of the protective layer of the original reinforced concrete;

[0036] S3) 6 longitudinal grouting grooves are carved along the tunnel as grouting channels. The number of longitudinal grouting grooves 6 is determined according to the design requirements, and the length 1 is generally not more than 3m;

[0037] S4) Fix the grouting pipe 2 along the longitudinal grouting groove 6, firmly fix it to the inner side of the longitudinal grouting groove 6 with the iron hoop 7 and the fast-setting epoxy adhesive 8, and lead out the grouting inlet and outlet at both ends of the lining section;

[0038] S5) Divide the steel lining into sections, and divide each section into several tiles 15. Transport the tiles 15 into the tunnel for splicing and installation. The weight of each tile 15 shall not exceed the load capacity of the opening and closing support equipment;

[0039] S6) When assembling the tiles 15 of the head end steel pipe segment 11, the corresponding head end grout inlet pipe 21 is led out from the grouting hole 12 of the steel liner, and the tiles 15 are assembled and the longitudinal welds 16 are welded to form the pipe segment 11;

[0040] S7) installing the tile 15 of the next pipe segment 11 according to the above step S6), and welding the adjacent pipe segments 11 using the circumferential weld 17;

[0041] S8), repeat the above steps to install the next pipe section 11 until the end pipe section 11 is reached, and the tail end slurry outlet pipe 23 is led out;

[0042] S9) After the installation of the entire pipe section is completed, grouting is performed using the grout inlet and grout outlet of the grouting pipe 2. Grouting is performed from a plurality of openings provided in the middle section 22 of the grouting pipe to fill the gap between the steel lining and the lining until the repair requirements are met.

[0043] The reinforced concrete defect repair structure of the utility model utilizes a steel lining to replace a defective section of reinforced concrete lining without chiseling out the original defective section of concrete lining, and directly places the defective part on the back of the steel lining; since the entire concrete lining is avoided, the affected area is reduced, the construction difficulty is relatively reduced, and the risk of secondary damage is reduced.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A new type of reinforced concrete defect repair structure, which is designed for tunnels with large reinforced concrete lining defects that are difficult to handle and where conventional solutions may result in secondary damage, and is characterized by: It includes a steel lining and a grouting pipe. The steel lining is composed of several sections of steel pipes. Steel pipe sections are arranged between the steel pipes and are connected in a circular welding form. The first section and the last section of the steel pipe lead out the grouting pipe's grouting inlet and grouting outlet respectively. The middle section of the grouting pipe is provided with several openings.

2. A new reinforced concrete defect repair structure according to claim 1, characterized in that: The steel lining is connected and fixed to the defective part of the lining through a plurality of stiffening rings.

3. A new reinforced concrete defect repair structure according to claim 2, characterized in that: The stiffening ring is arranged in an annular groove of the stiffening ring, and the annular groove of the stiffening ring is pre-drilled at a defective part of the lining.

4. The novel reinforced concrete defect repair structure according to claim 2 is characterized in that: The grouting pipe is arranged in a longitudinal grouting groove, which is pre-drilled at a defective part of the lining, and the grouting pipe is bonded to the bottom of the groove through an iron sheet hoop.

5. A new reinforced concrete defect repair structure according to claim 2 or 3, characterized in that: The grouting pipe comprises a head end grouting pipe, a middle section of the grouting pipe and a tail end grouting pipe which are connected in sequence.

6. The novel reinforced concrete defect repair structure according to claim 2 is characterized by: Each section of the steel pipe is divided into a number of tiles, and the tiles are spliced ​​and installed in the tunnel, with longitudinal welds and circumferential welds formed between the tiles.

7. The novel reinforced concrete defect repair structure according to claim 6 is characterized by: A back plate is pre-welded on the back of the tile to facilitate assembly of adjacent tiles.

8. The novel reinforced concrete defect repair structure according to claim 3 is characterized by: The reinforcing ring is provided with a grouting hole to facilitate the passage of the grouting pipe.

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