Precast concrete corridor anti-seepage structure and construction method

Abstract

A precast concrete corridor anti-seepage structure and construction method, the anti-seepage structure comprising a corridor formed by a plurality of precast single-frame corridor components spliced in sequence, each precast single-frame corridor component comprising a precast circular arch section and precast straight wall sections connected to the lower ends of both sides of the precast circular arch section; a longitudinal flat joint structure is provided at the joint positions of two adjacent precast single-frame corridor components, the longitudinal flat joint structure comprising longitudinal reserved notches provided on the outside of the joint positions of adjacent precast circular arch sections and adjacent precast straight wall sections, anti-seepage concrete poured on the longitudinal reserved notches, and an anti-seepage layer laid on the outside of the positions of the anti-seepage concrete; a transverse contact structure is provided at the joint position between the precast circular arch section and the precast straight wall section, a vertical drainage pipe is provided inside the precast straight wall section; a longitudinal upper groove and a longitudinal lower groove together form a longitudinal drainage trough, the upper end of the vertical drainage pipe is connected to the longitudinal drainage trough, and the lower end is connected to the drainage ditch in the corridor.

Description

Technical Field

[0001] The present invention relates to the field of prefabricated installation and anti-seepage of concrete corridors, and in particular to a prefabricated concrete corridor anti-seepage structure and a construction method. Background Art

[0002] When arranging a water conservancy project, corridors or holes are often required to meet various requirements such as irrigation, flood discharge, transportation, and drainage. Regarding corridor structures, some literature has disclosed relevant technologies.

[0003] Patent application with publication number CN112746598A discloses an anti-seepage structure for corridors at the joints of a rolled dam structure and its construction method. The structure includes a waterstop and two corridors A. The two corridors A are connected by a waterstop. The two corridors A are formed by pouring concrete at one time. The waterstop is manufactured as an integral part and prefabricated together with the two corridors A.

[0004] Patent publication number CN203821347U discloses a precast reinforced concrete gallery structure for roller-compacted concrete dams. This structure utilizes a fully reinforced concrete precast gallery structure. This effectively reduces the construction period for long corridors within the dam, minimizes construction disruptions, and maximizes the rapid and continuous construction capabilities of roller-compacted concrete dams.

[0005] Patent application publication number CN103526724A discloses an anchored anti-seepage structure connecting a geomembrane at the reservoir bottom to the peripheral seams of the drainage gallery surrounding the reservoir. Firstly, the geomembrane is anchored at the top of the drainage gallery to reduce the force transmitted to the joints between the geomembrane and the peripheral seams of the drainage gallery due to tensile deformation, thereby ensuring the watertightness of the anti-seepage joint. Secondly, the geomembrane is extended to the peripheral seams of the drainage gallery surrounding the reservoir, ensuring the integrity of the reservoir bottom anti-seepage system and preventing water leakage at the drainage gallery joints.

[0006] Patent announcement number CN204326032U discloses a drainage gallery structure inside a concrete dam. The construction of drainage holes can be completed by utilizing the time interval for inspection and acceptance of the dam foundation consolidation grouting and the construction period of other dam foundation gallery systems. The process is relatively simple and, with a certain amount of construction investment, will not occupy the linear construction period of the project.

[0007] The speed of corridor construction directly affects the entire construction period, so the use of prefabricated corridor construction can effectively improve construction efficiency and save construction time. However, during the construction of the corridor, it is easy to have engineering problems such as installation dislocation, stress concentration, and seepage, which will greatly extend the construction period. Prefabricated corridors mostly adopt the city gate type, and the prefabricated structure is divided into a circular arch section and a straight wall section. The horizontal and vertical installation mostly adopts the flat seam overlap transition method, and geomembranes are laid between the joints for anti-seepage treatment. However, during the installation of the corridor, there may be some process errors when the corridor is prefabricated, which will cause the corridor to be unable to be accurately installed, and the gap between the contact surfaces is wide. In addition, the geomembrane is easily damaged by tensile stress during construction, resulting in leakage in the seams between the corridors, making corridor drainage and anti-seepage more difficult. The above-mentioned prior art patents do not involve an anti-seepage structure in which the cross-section of the prefabricated corridor is arc-shaped, the anti-seepage is embedded horizontally, and the vertical flat transition is performed. Summary of the Invention

[0008] The main purpose of the present invention is to propose a precast concrete corridor anti-seepage structure and construction method, which adopts horizontal embedding and vertical flat connection for installation to solve the corridor installation problem, horizontal leakage problem, and vertical seepage problem.

[0009] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a precast concrete corridor anti-seepage structure, comprising a corridor formed by a plurality of precast single-frame corridor components spliced in sequence, a corridor concrete pavement is arranged in the corridor, each precast single-frame corridor component comprises a precast circular arch section, and precast straight wall sections connected to the lower ends of both sides of the precast circular arch section; a longitudinal flat joint structure is arranged at the joint position between the precast circular arch sections of two adjacent precast single-frame corridor components, and at the joint position between the precast straight wall sections of two adjacent precast single-frame corridor components, the longitudinal flat joint structure comprises longitudinal reserved notches arranged at the outside of the joint positions of adjacent precast circular arch sections and the outside of the joint positions of adjacent precast straight wall sections, and anti-seepage concrete is poured on the longitudinal reserved notches to prevent the seepage of the corridor from being blocked. and an anti-seepage layer laid on the outside of the anti-seepage concrete position; a transverse contact structure is provided at the connection position of the prefabricated arch section and the prefabricated straight wall section, and the transverse contact structure includes a concave arc surface provided on the top of the prefabricated straight wall section, and a convex arc surface provided on the lower end surfaces of both sides of the prefabricated arch section, and the concave arc surface cooperates with the convex arc surface; a longitudinal lower groove is provided on the concave arc surface on the top of the prefabricated straight wall section, and a longitudinal upper groove is provided on the convex arc surface on the lower end of both sides of the prefabricated arch section; a vertical drainage pipe is provided inside the prefabricated straight wall section; the longitudinal upper groove and the longitudinal lower groove together form a longitudinal drainage trough, the upper end of the vertical drainage pipe is connected to the longitudinal drainage trough, and the lower end is connected to the drainage ditch in the corridor.

[0010] Preferably, the vertical drainage pipe is arranged in the middle of the prefabricated straight wall section on each prefabricated single-frame corridor component, and the longitudinal drainage trough is inclined downward from the two ends of the prefabricated straight wall section to the vertical drainage pipe to form a drainage slope.

[0011] Preferably, the anti-seepage layer laid on the outside of the anti-seepage concrete position includes a base glue layer, an anti-seepage membrane, and an anti-seepage cover sheet arranged in sequence from the inside to the outside.

[0012] Preferably, anti-seepage concrete is also poured on the longitudinal flat joints formed at the joints between the prefabricated arch sections of two adjacent prefabricated single-frame corridor components and at the joints between the prefabricated straight wall sections of two adjacent prefabricated single-frame corridor components.

[0013] Preferably, a plurality of prefabricated holes are provided on the concave arc surface at the top of the prefabricated straight wall section, and a plurality of prefabricated concrete piles are provided on the convex arc surfaces at the lower ends of both sides of the prefabricated circular arch section; when the prefabricated circular arch section is docked with the prefabricated straight wall section, the prefabricated concrete piles are inserted into the prefabricated holes.

[0014] Preferably, the drainage ditch is arranged on the concrete pavement of the corridor near the bottom of the prefabricated straight wall section; the vertical drainage pipe and the drainage ditch are connected by a right-angle joint, and non-woven fabric is wrapped around the periphery of the connection position between the right-angle joint and the vertical drainage pipe and the drainage ditch.

[0015] Preferably, a drainage ditch cover is provided on the drainage ditch, and the position of the drainage ditch cover corresponds to the position of the right-angle joint at the outlet of the vertical drain pipe.

[0016] Preferably, the drainage ditch is provided with a drainage slope.

[0017] Preferably, a corridor buried section is provided at the lower end of the prefabricated straight wall section; and a plurality of hoisting holes are provided on the prefabricated arch section.

[0018] On the other hand, the present invention also proposes a construction method according to the above-mentioned precast concrete corridor anti-seepage structure, comprising the following steps:

[0019] Step S1: preparing prefabricated circular arch sections and prefabricated straight wall sections;

[0020] Step S2: When the lower dam body of the corridor is close to the corridor ground, the lower part of the prefabricated vertical wall section is inserted into the dam body to carry out the lower dam body construction. At the same time, the construction of the corridor concrete pavement in the corridor and the construction of drainage ditches on both sides of the corridor concrete pavement are carried out;

[0021] Step S3: When the prefabricated straight wall segment has anti-overturning ability and stability, the prefabricated circular arch segment is hoisted and installed on the top of the prefabricated straight wall segment, and the concave arc surface on the top of the prefabricated straight wall segment is matched with the convex arc surfaces on the lower end surfaces of the prefabricated circular arch segment to form a single-section corridor; the longitudinal upper groove and the longitudinal lower groove are closed together to form a longitudinal drainage trough;

[0022] Step S4: Repeat steps S2 to S3 to carry out the construction of the next single-frame corridor. The joints of the prefabricated circular arch sections between two adjacent single-frame corridors and the joints of the prefabricated straight wall sections between two adjacent single-frame corridors are all transitionally connected using a longitudinal flat joint structure.

[0023] Step S5: Repeat steps S2 to S4 until the entire prefabricated corridor is installed and constructed.

[0024] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0025] (1) In the present invention, a transverse contact structure is provided at the connection portion between the prefabricated circular arch section and the prefabricated straight wall section. The transverse contact structure includes a concave arc surface provided at the top of the prefabricated straight wall section, and a convex arc surface provided at the lower end surfaces of both sides of the prefabricated circular arch section. The concave arc surface cooperates with the convex arc surface. Through the above structure, the concave arc surface and the convex arc surface play a self-positioning role when they cooperate with each other, so that the accurate installation and positioning of the prefabricated circular arch section and the top of the prefabricated straight wall section can be achieved, thereby preventing engineering problems caused by installation misalignment.

[0026] (2) In the present invention, longitudinal flat joint structures are provided at the joints between the prefabricated circular arch sections of two adjacent prefabricated single-frame corridor components, as well as at the joints between the prefabricated straight wall sections of two adjacent prefabricated single-frame corridor components, for connection and transition. The longitudinal reserved gaps provided at the longitudinal flat joint structures are used for the construction of anti-seepage concrete, and waterproof materials are laid on the outside, which can effectively solve the problem of longitudinal leakage during the installation of prefabricated concrete corridors.

[0027] (3) In the present invention, a longitudinal drainage ditch is formed by forming a longitudinal upper groove and a longitudinal lower groove at the contact surface between the prefabricated circular arch section and the prefabricated straight wall section, and drainage is centralized by a vertical drainage pipe inside the prefabricated straight wall section. In addition, the contact surface at the top of the prefabricated straight wall section is a concave arc surface. Therefore, the transverse connection formed between the prefabricated straight wall section and the prefabricated circular arch section does not need to be anti-seepage construction, which further simplifies the construction operation.

[0028] (4) In the construction method provided by the present invention, during construction, the lower part of the prefabricated vertical wall section is inserted into the dam body to form a reserved buried deep section, which is constructed simultaneously with the concrete of the corridor bottom. Since the prefabricated vertical wall section has sufficient stability after the construction of the corridor concrete pavement is completed in the later stage, the prefabricated vertical wall section does not require a special support formwork when the prefabricated arch section is hoisted, which simplifies the construction operation.

[0029] (5) The precast concrete corridor anti-seepage structure and construction method provided by the present invention is a corridor anti-seepage structure and construction method that integrates accurate positioning, drainage, and anti-seepage, which can effectively solve engineering problems such as easy dislocation and seepage during corridor prefabrication and installation, and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the cross-section installation of the prefabricated corridor;

[0032] Figure 2 It is a schematic diagram of the horizontal connection of the prefabricated corridor;

[0033] Figure 3 It is a schematic diagram of the connection relationship of the transverse contact surface of the prefabricated corridor;

[0034] Figure 4 It is a schematic diagram of the horizontal lower contact surface and connection structure of the prefabricated corridor;

[0035] Figure 5 It is a schematic diagram of the transverse contact surface and connection structure of the prefabricated corridor;

[0036] Figure 6 It is a schematic diagram of the prefabricated gallery drainage ditch;

[0037] Figure 7 This is a schematic diagram of the right-angle joint of the prefabricated gallery drainage pipe;

[0038] Figure 8 It is a schematic diagram of the connection of the longitudinal contact surface of the prefabricated corridor;

[0039] Figure 9 It is a schematic diagram of the longitudinal reserved gap in the longitudinal flat joint structure of the prefabricated corridor;

[0040] Figure 10 This is a schematic diagram of the longitudinal anti-seepage layer of the prefabricated corridor.

[0041] Explanation of the accompanying numbers: 1. Horizontal contact structure; 2. Precast hole; 3. Precast concrete pile; 4. Longitudinal lower groove; 5. Longitudinal upper groove; 6. Precast arch section; 7. Precast vertical wall section; 8. Vertical drainage pipe; 9. Drainage ditch; 10. Drainage ditch cover; 11. Corridor buried section; 12. Corridor concrete pavement; 13. Lifting hole; 14. Right-angle joint; 15. Non-woven fabric; 17. Drainage direction; 19. Anti-seepage layer; 20. Longitudinal flat joint structure; 21. Longitudinal reserved notch; 22. Longitudinal flat joint; 26. Anti-seepage concrete; 27. Bottom glue layer; 28. Anti-seepage membrane; 29. Anti-seepage cover. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) 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.

[0044] Combine Figures 1 to 10 As shown, a precast concrete corridor anti-seepage structure includes a corridor formed by a plurality of precast single-frame corridor components spliced in sequence, a corridor concrete pavement 12 is provided in the corridor, and each precast single-frame corridor component includes a precast circular arch section 6 and precast straight wall sections 7 connected to the lower ends of both sides of the precast circular arch section 6;

[0045] A longitudinal flat joint structure 20 is provided at the joint portion between the precast circular arch sections 6 of two adjacent precast single-frame corridor components, and at the joint portion between the precast straight wall sections 7 of two adjacent precast single-frame corridor components. The longitudinal flat joint structure 20 includes a longitudinal reserved notch 21 provided outside the joint portion between the adjacent precast circular arch sections 6 and the adjacent precast straight wall sections 7, an anti-seepage concrete 26 poured on the longitudinal reserved notch 21, and an anti-seepage layer laid outside the position of the anti-seepage concrete 26.

[0046] A transverse contact structure 1 is provided at the connection portion between the prefabricated circular arch section 6 and the prefabricated straight wall section 7. The transverse contact structure 1 comprises a concave arc surface provided at the top of the prefabricated straight wall section 7, and convex arc surfaces provided at the lower end surfaces of both sides of the prefabricated circular arch section 6. The concave arc surface cooperates with the convex arc surface.

[0047] A longitudinal lower groove 4 is provided on the concave arc surface at the top of the prefabricated straight wall section 7, and a longitudinal upper groove 5 is provided on the convex arc surfaces at the lower ends of both sides of the prefabricated arch section 6; a vertical drainage pipe 8 is provided inside the prefabricated straight wall section 7; the longitudinal upper groove 5 and the longitudinal lower groove 4 together form a longitudinal drainage trough, the upper end of the vertical drainage pipe 8 is connected to the longitudinal drainage trough, and the lower end is connected to the drainage ditch 9 in the corridor.

[0048] The vertical drainage pipe 8 is arranged in the middle of the prefabricated straight wall section 7 on each prefabricated single corridor component. The longitudinal drainage trough is inclined downward from the two ends of the prefabricated straight wall section 7 to the vertical drainage pipe 8 to form a drainage slope. The drainage direction 17 of the vertical drainage pipe 8 is as follows: Figure 2As shown, in this embodiment, the vertical drain pipe 8 has the same diameter as the longitudinal drainage groove, both of which are 3.5 cm to 5 cm in diameter. The upper longitudinal groove 5 corresponds to the lower longitudinal groove 4 in position. By setting the drainage slope, the vertical drain pipe 8 at the top of each prefabricated straight wall section 7 flows like the middle part, facilitating the drainage of seepage water.

[0049] The anti-seepage layer laid outside the location of the anti-seepage concrete 26 includes, from the inside out, a base adhesive layer 27, an anti-seepage membrane 28, and an anti-seepage cover sheet 29. In this embodiment, the longitudinal reserved gap 21 is a 10 cm x 3 cm square gap. During construction, the longitudinal reserved gap 21 is filled with anti-seepage concrete 26. When the anti-seepage concrete reaches a certain concrete compressive strength, the base adhesive layer 27 is laid. After the base adhesive layer 27 is fixed, the anti-seepage membrane 28 and anti-seepage cover sheet 29 are laid. The base adhesive layer 27 is 2 mm to 5 mm thick and 70 cm long in the longitudinal direction; the anti-seepage membrane 29 is 2 mm thick and 60 cm long in the longitudinal direction; and the anti-seepage cover sheet 29 is 50 cm long in the longitudinal direction. These dimensions are not limited to this embodiment and can be determined according to actual conditions.

[0050] Anti-seepage concrete 26 is also poured on the longitudinal flat joints 22 formed at the joints between the prefabricated arch sections 6 of two adjacent prefabricated single-frame corridor components and the prefabricated straight wall sections 7 of two adjacent prefabricated single-frame corridor components to further ensure the anti-seepage effect.

[0051] A plurality of precast holes 2 are provided on the concave arcuate surface at the top of the precast vertical wall section 7, and a plurality of precast concrete piles 3 are provided on the convex arcuate surfaces at the lower ends of the precast circular arch section 6. When the precast circular arch section 6 is docked with the precast vertical wall section 7, the precast concrete piles 3 are inserted into the precast holes 2. In this embodiment, the diameters of the precast holes 2 and precast concrete piles 3 are both 3.5 cm to 5 cm, and the depth of the precast hole 2 is 10 cm to 15 cm. The length of the precast concrete piles 3 is compatible with the depth of the precast hole 2, allowing for seamless installation. The provision of the precast holes 2 and precast concrete piles 3 further secures and positions the precast circular arch section 6 and the precast vertical wall section 7.

[0052] The drainage ditch 9 is arranged on the corridor concrete pavement 12 near the bottom of the prefabricated straight wall section 7; the vertical drainage pipe 8 and the drainage ditch 9 are connected by a right-angle joint 14, and a non-woven fabric 15 is wrapped around the periphery of the connection position between the right-angle joint 14 and the vertical drainage pipe 8 and the drainage ditch 9.

[0053] A drain cover 10 is installed on the drain ditch 9. The position of the drain cover 10 corresponds to the position of the right-angle joint 14 at the outlet of the vertical drain pipe 8. This structure allows the drain cover 10 to be opened to clear the blockage when the outlet of the vertical drain pipe 8 becomes clogged. The size of the drain cover 10 is 15 cm to 15 cm, which is not limited to this embodiment and can be adjusted according to actual conditions.

[0054] The drain ditch 9 is provided with a drainage slope. By setting the drainage slope, it is convenient for water inside the drain ditch to flow out.

[0055] A corridor buried section 11 is provided at the lower end of the prefabricated straight wall section 7. In this embodiment, the dimensions of the corridor buried section 11 are 25 cm to 40 cm. This dimension is not limited to this embodiment and can be selected based on actual conditions, but must ensure the stability of the corridor itself. A plurality of lifting holes 13 are provided on the prefabricated arch section 6.

[0056] In this embodiment, the size of the prefabricated single-frame corridor component is determined according to the actual use of the corridor.

[0057] In this embodiment, a construction method of the above-mentioned precast concrete corridor anti-seepage structure is also provided, which is characterized by comprising the following steps:

[0058] Step S1: preparing a prefabricated arch section 6 and a prefabricated straight wall section 7;

[0059] Step S2: When the lower dam body of the corridor is close to the corridor ground, the lower part of the prefabricated straight wall section 7 is inserted into the dam body to carry out the lower dam body construction. At the same time, the construction of the corridor concrete pavement 12 in the corridor and the construction of the drainage ditches 9 on both sides of the corridor concrete pavement 12 are carried out;

[0060] Step S3: When the prefabricated straight wall section 7 has anti-overturning ability and stability, the prefabricated arch section 6 is hoisted and installed on the top of the prefabricated straight wall section 7, and the concave arc surface on the top of the prefabricated straight wall section 7 is matched with the convex arc surfaces on the lower end surfaces of the prefabricated arch section 6 on both sides to form a single-section corridor; the longitudinal upper groove 5 and the longitudinal lower groove 4 are closed together to form a longitudinal drainage groove;

[0061] Step S4: Repeat steps S2 to S3 to construct the next single-bay corridor. The joints of the prefabricated arch sections 6 between two adjacent single-bay corridors and the joints of the prefabricated straight wall sections 7 between two adjacent single-bay corridors are both transitionally connected using longitudinal flat joint structures 20.

[0062] Step S5: Repeat steps S2 to S4 until the entire prefabricated corridor is installed and constructed.

[0063] In the present invention, it is also possible to adopt the idea of synchronous construction of a single corridor and synchronous anti-seepage. The specific construction steps are as follows:

[0064] A. The dam body concrete is poured to the design elevation of the bottom of the buried corridor section 11;

[0065] B. Hoisting of prefabricated single-frame corridor components, including prefabricated straight wall section 7 and prefabricated arch section 6;

[0066] C. Installation of prefabricated single-frame corridor components, and installation of prefabricated straight wall sections 7 and prefabricated arch sections 6 to form prefabricated single-frame corridor components;

[0067] D. The dam body concrete is poured to the design elevation of the top edge of the buried corridor section 11;

[0068] E. Construct the corridor concrete pavement 12 and drainage ditch 9 at the bottom of the single corridor;

[0069] F. Adjacent prefabricated single-bay corridor components are connected and transitioned using a longitudinal flat joint structure 20, embedded transversely, and subjected to longitudinal anti-seepage construction;

[0070] G. Concrete pouring at 22 longitudinal flat joints of the corridor;

[0071] H. Concrete the outer edge of the longitudinal flat joint 22;

[0072] I. Repeat the above steps until the corridor is completed.

[0073] The top of each prefabricated vertical wall section 7 of the present invention adopts a concave arcuate surface, equipped with a vertical drain pipe 8. This, in conjunction with the longitudinal upper groove 5 and the longitudinal lower groove 4, forms a longitudinal drainage trough. This, in conjunction with the concave arcuate surface on the top surface of the prefabricated vertical wall section 7, can be used for drainage and anti-seepage. The concave arcuate surface on the top of the prefabricated vertical wall section 7 cooperates with the convex arcuate surfaces on the lower end surfaces of the prefabricated circular arch section 6 to form an automatic positioning structure. Furthermore, the prefabricated holes 2 cooperate with the prefabricated concrete piles 3 to further secure and position the prefabricated circular arch section 6 and the prefabricated vertical wall section 7. Furthermore, longitudinal notches 21 are reserved on the outer edges of the prefabricated circular arch section 6 and the prefabricated vertical wall section 7 to facilitate the formation of a longitudinal flush joint structure 20 for joint anti-seepage. In this embodiment, the vertical drain pipe 8 is located only in the center of each prefabricated vertical wall section 7, and the longitudinal drainage trough has a certain drainage slope. In the present invention, the corridor is installed by horizontal embedding and vertical flat connection, which can effectively solve the corridor installation problem and horizontal leakage problem. The vertical construction can effectively solve the vertical seepage problem. The whole construction process is simple and does not require large-scale construction templates and highly professional personnel. It can also effectively solve engineering problems such as installation dislocation. This structure has a simple construction process and is convenient and flexible to operate. It can effectively shorten the construction period and improve efficiency. According to the actual needs of the project, the structure can also be used as a traffic tunnel, grouting tunnel, ventilation tunnel, etc.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A precast concrete corridor anti-seepage structure, comprising a corridor formed by a plurality of precast single-frame corridor components spliced in sequence, wherein a corridor concrete pavement (12) is provided in the corridor, characterized in that: Each prefabricated single-frame corridor component comprises a prefabricated circular arch section (6) and prefabricated straight wall sections (7) connected to the lower ends of both sides of the prefabricated circular arch section (6); A longitudinal flat joint structure (20) is provided at the joint position between the precast circular arch sections (6) of two adjacent precast single-frame corridor components and at the joint position between the precast straight wall sections (7) of two adjacent precast single-frame corridor components. The longitudinal flat joint structure (20) comprises a longitudinal reserved notch (21) provided outside the joint position of the adjacent precast circular arch sections (6) and outside the joint position of the adjacent precast straight wall sections (7), an anti-seepage concrete (26) poured on the longitudinal reserved notch (21), and an anti-seepage layer laid outside the position of the anti-seepage concrete (26); A transverse contact structure (1) is provided at the connection portion between the prefabricated circular arch section (6) and the prefabricated straight wall section (7), the transverse contact structure (1) comprising a concave arc surface provided at the top of the prefabricated straight wall section (7), and convex arc surfaces provided at the lower end surfaces of both sides of the prefabricated circular arch section (6), the concave arc surface and the convex arc surface being matched; A longitudinal lower groove (4) is provided on the concave arc surface at the top of the prefabricated straight wall section (7), and longitudinal upper grooves (5) are provided on the convex arc surfaces at the lower ends of both sides of the prefabricated circular arch section (6); a vertical drainage pipe (8) is provided inside the prefabricated straight wall section (7); the longitudinal upper groove (5) and the longitudinal lower groove (4) together form a longitudinal drainage trough, the upper end of the vertical drainage pipe (8) is connected to the longitudinal drainage trough, and the lower end is connected to the drainage ditch (9) in the corridor.

2. The precast concrete corridor anti-seepage structure according to claim 1, characterized in that: The vertical drainage pipe (8) is arranged in the middle of the prefabricated straight wall section (7) on each prefabricated single-frame corridor component, and the longitudinal drainage groove is inclined downward from the two ends of the prefabricated straight wall section (7) to the vertical drainage pipe (8) to form a drainage slope.

3. The precast concrete corridor anti-seepage structure according to claim 1, characterized in that: The anti-seepage layer laid on the outer side of the anti-seepage concrete (26) comprises a base glue layer (27), an anti-seepage membrane (28), and an anti-seepage cover sheet (29) which are arranged in sequence from the inside to the outside.

4. The precast concrete corridor anti-seepage structure according to claim 1, characterized in that: Anti-seepage concrete (26) is also poured on the longitudinal flat joints (22) formed at the joints between the prefabricated circular arch sections (6) of two adjacent prefabricated single-frame corridor components and at the joints between the prefabricated straight wall sections (7) of two adjacent prefabricated single-frame corridor components.

5. The precast concrete corridor anti-seepage structure according to claim 1, characterized in that: A plurality of prefabricated holes (2) are provided on the concave arc surface at the top of the prefabricated straight wall section (7), and a plurality of prefabricated concrete piles (3) are provided on the convex arc surfaces at the lower ends of both sides of the prefabricated circular arch section (6); when the prefabricated circular arch section (6) is butted against the prefabricated straight wall section (7), the prefabricated concrete piles (3) are inserted into the prefabricated holes (2).

6. The precast concrete corridor anti-seepage structure according to claim 1, characterized in that: The drainage ditch (9) is arranged on the corridor concrete pavement (12) near the bottom of the prefabricated vertical wall section (7); the vertical drainage pipe (8) and the drainage ditch (9) are connected via a right-angle joint (14), and a non-woven fabric (15) is wrapped around the periphery of the connection position between the right-angle joint (14), the vertical drainage pipe (8) and the drainage ditch (9).

7. The precast concrete corridor anti-seepage structure according to claim 6, characterized in that: A drainage ditch cover (10) is provided on the drainage ditch (9), and the position of the drainage ditch cover (10) corresponds to the position of the right-angle joint (14) at the outlet of the vertical drainage pipe (8).

8. The precast concrete corridor anti-seepage structure according to claim 6, characterized in that: The drainage ditch (9) is provided with a drainage slope.

9. The precast concrete corridor anti-seepage structure according to claim 1, characterized in that: A corridor buried section (11) is provided at the lower end of the prefabricated straight wall section (7); and a plurality of hoisting holes (13) are provided on the prefabricated circular arch section (6).

10. A construction method for a precast concrete corridor anti-seepage structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step S1: preparing a prefabricated circular arch section (6) and a prefabricated straight wall section (7); Step S2: When the construction of the lower dam body of the corridor approaches the corridor ground, the lower part of the prefabricated straight wall section (7) is inserted into the dam body to carry out the construction of the lower dam body, and at the same time, the construction of the corridor concrete pavement (12) in the corridor and the construction of the drainage ditches (9) on both sides of the corridor concrete pavement (12) are carried out; Step S3: When the prefabricated straight wall section (7) has anti-overturning ability and stability, the prefabricated circular arch section (6) is hoisted and installed on the top of the prefabricated straight wall section (7), and the concave arc surface on the top of the prefabricated straight wall section (7) is matched with the convex arc surfaces on the lower end surfaces of the prefabricated circular arch section (6) on both sides to form a single-section corridor; the longitudinal upper groove (5) and the longitudinal lower groove (4) are closed to form a longitudinal drainage groove; Step S4: Repeat steps S2 to S3 to carry out the construction of the next section of the single-frame corridor, and the joint parts of the prefabricated circular arch sections (6) between two adjacent sections of the single-frame corridor and the joint parts of the prefabricated straight wall sections (7) between two adjacent sections of the single-frame corridor are all transitionally connected using the longitudinal flat joint structure (20); Step S5: Repeat steps S2 to S4 until the entire prefabricated corridor is installed and constructed.

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