Rapid repair method for cracks in large-section underground rainwater culverts

Abstract

The present invention relates to a method for quickly repairing cracks through a large-section underground rainwater box culvert. First, a CCTV detection robot is used to find the crack position on the box culvert, and then the corresponding ground position above the crack position of the box culvert is determined; three grouting pipes are welded longitudinally on the inner wall of a Larsen steel sheet pile, and the steel sheet pile is inserted and driven along the crack position of the box culvert on the ground close to the outer wall of the box culvert, and high-pressure water is injected into the soil layer through a grouting pipe while inserting and driving, and the wall backfill in the U-shaped groove of the steel sheet pile is impacted into mud, and the mud is discharged through the other two grouting pipes until the steel sheet pile is inserted and driven to the blade foot of the box culvert; finally, a high-pressure grouting machine is used to press cement slurry into the hole through three grouting pipes to seal the cracks on the outer wall of the box culvert from the outside. The present invention can repair the cracks of the box culvert on the ground, can ensure construction safety, and has better effect than the conventional internal repair of the box culvert.

Description

Technical Field

[0001] The invention belongs to the field of municipal water supply and drainage construction, and in particular relates to a method for repairing cracks in an underground rainwater box culvert. Background Art

[0002] During the use of large-section underground rainwater box culverts, due to possible quality problems during construction and aging of materials, through cracks will inevitably appear, causing the water in the box culvert to seep through the cracks to the backfill on the wall. The backfill on the wall will settle after being soaked in the accumulated water, which will cause uneven settlement of the built road surface and affect road driving safety. Therefore, when through cracks appear in the box culvert, it must be repaired.

[0003] The conventional repair method is for workers to enter the box culvert through the inspection port to carry out repairs. However, the working space inside the box culvert is limited, the interior is filled with toxic and harmful gases, and there is water inside the box culvert. Therefore, usually only simple surface repairs can be performed, and the repair material cannot be injected deep into the cracks. Often, the cracks will expand again within less than half a year and require repeated repairs. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems and to propose a method for repairing an underground rainwater box culvert, which does not require workers to enter the interior of the box culvert to operate, thereby ensuring construction safety and improving repair quality.

[0005] The technical solution of the present invention is as follows:

[0006] A method for quickly repairing cracks in a large-section underground rainwater culvert, characterized by comprising the following steps:

[0007] (1) Determine the location of the box culvert crack: Use a CCTV detection robot to walk along the inside of the box culvert to find the crack on the box culvert; determine the corresponding ground position above the box culvert crack;

[0008] (2) Making steel sheet piles: welding three grouting pipes along the longitudinal direction on the inner wall of a Larsen steel sheet pile, wherein the length of the steel sheet pile is not less than the height of the box culvert, and the grouting pipes are arranged along the entire length of the steel sheet pile;

[0009] (3) Inserting and driving steel sheet piles: Excavate the ground until the top plate above the crack of the box culvert is exposed, and insert steel sheet piles along the crack of the box culvert close to the outer wall of the box culvert, with the U-shaped groove of the steel sheet pile facing the outer wall of the box culvert. While inserting and driving, inject high-pressure water into the soil layer through a grouting pipe to impact the backfill soil in the U-shaped groove into mud. At the same time, pump slurry through the other two grouting pipes to discharge the mud in the U-shaped groove until the steel sheet pile is inserted and driven to the edge of the box culvert, so that a hole is formed between the steel sheet pile and the side wall of the box culvert;

[0010] (4) Hole cleaning: Use a high-pressure water pipe to flush the side walls of the box culvert in the hole;

[0011] (5) Grouting in the hole: Use a high-pressure grouting machine to inject cement slurry into the hole through three grouting pipes until it is flush with the top plate of the box culvert and no more slurry overflows; clean the slurry on the top plate of the box culvert; after the cement slurry solidifies, it forms a whole with the side wall of the box culvert and seals the cracks on the outer wall of the box culvert. The steel sheet piles are left in the backfill of the wall to stabilize the cement.

[0012] The invention has a simple construction method and can repair the cracks in the box culvert on the ground without the need for construction workers to enter the inside of the box culvert, thereby ensuring construction safety. The repair effect is better than conventional internal surface repair and can ensure that the cracks will not be damaged for many years. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a construction flow chart of the present invention;

[0014] Figure 2 is a cross-sectional view of a steel sheet pile;

[0015] Figure 3 It is the inside side view of the steel sheet pile;

[0016] Figure 4 It is an elevation view of the repair method of the present invention;

[0017] Figure 5 It is a plan view of the repair method of the present invention. DETAILED DESCRIPTION

[0018] Figure 1 It is a construction flow chart of the present invention, and the specific implementation method is as follows:

[0019] (1) Determine the location of the crack in the box culvert: Use a CCTV detection robot to walk along the inside of the box culvert to find the crack on the box culvert; determine the corresponding ground position above the crack in the box culvert based on the layout of the box culvert and the distance from the crack to the entrance of the box culvert.

[0020] (2) Making steel sheet piles: Figure 2 , Figure 3 As shown, three grouting pipes 2 are welded longitudinally on the inner wall of a Larsen steel sheet pile 1 , the length of the steel sheet pile is not less than the height of the box culvert, and the grouting pipes 2 are arranged along the entire length of the steel sheet pile 1 .

[0021] (3) Driving steel sheet piles: Figure 4 , Figure 5As shown, the ground is excavated until the top plate above the crack of the box culvert 3 is exposed, and the steel sheet pile 1 is inserted and driven along the crack 4 on the box culvert 3 close to the outer wall of the box culvert, with the U-shaped groove of the steel sheet pile 1 facing the outer wall of the box culvert 3. While the steel sheet pile 1 is inserted and driven, high-pressure water is injected into the soil layer through a grouting pipe 2 to impact the backfill soil in the U-shaped groove into mud. At the same time, the mud in the U-shaped groove is discharged by pumping slurry through the other two grouting pipes until the steel sheet pile 1 is inserted and driven to the edge of the box culvert 3, so that a hole 5 is formed between the steel sheet pile and the side wall of the box culvert.

[0022] (4) Hole cleaning: Use a high-pressure water pipe to flush the outer wall of the box culvert in the hole to clean it.

[0023] (5) Grouting in the hole: Use a high-pressure grouting machine to inject cement slurry into the hole 4 through three grouting pipes until it is flush with the top plate of the box culvert and no more slurry overflows; clean the slurry on the top plate of the box culvert; after the cement slurry solidifies, it forms a whole with the side wall of the box culvert and seals the crack 4 on the outer wall of the box culvert. The steel sheet pile 1 is left in the backfill 6 of the wall. The steel sheet pile 1 relies on the pressure of the outer backfill 6 to achieve self-stabilization and stabilize the cement column after solidification.

Claims

1. A method for quickly repairing cracks in large-section underground rainwater culverts, characterized in that: The following steps are involved: (1) Determine the location of the box culvert crack: Use a CCTV detection robot to walk along the inside of the box culvert to find the crack on the box culvert; determine the corresponding ground position above the box culvert crack; (2) Making steel sheet piles: welding three grouting pipes along the longitudinal direction on the inner wall of a Larsen steel sheet pile, wherein the length of the steel sheet pile is not less than the height of the box culvert, and the grouting pipes are arranged along the entire length of the steel sheet pile; (3) Inserting and driving steel sheet piles: Excavate the ground until the top plate above the crack of the box culvert is exposed, and insert steel sheet piles along the crack of the box culvert close to the outer wall of the box culvert, with the U-shaped groove of the steel sheet pile facing the outer wall of the box culvert. While inserting and driving, inject high-pressure water into the soil layer through a grouting pipe to impact the backfill soil in the U-shaped groove into mud. At the same time, pump slurry through the other two grouting pipes to discharge the mud in the U-shaped groove until the steel sheet pile is inserted and driven to the edge of the box culvert, so that a hole is formed between the steel sheet pile and the side wall of the box culvert; (4) Hole cleaning: Use a high-pressure water pipe to flush the side walls of the box culvert in the hole; (5) Grouting in the hole: Use a high-pressure grouting machine to inject cement slurry into the hole through three grouting pipes until it is flush with the top plate of the box culvert and no more slurry overflows; clean the slurry on the top plate of the box culvert; after the cement slurry solidifies, it forms a whole with the side wall of the box culvert and seals the cracks on the outer wall of the box culvert. The steel sheet piles are left in the backfill of the wall to stabilize the cement.

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