Underdam drainage culvert reinforcing structure for hydraulic engineering dam

Abstract

The under-dam drainage culvert reinforcing structure comprises a culvert wall, a filling grouting layer is fixedly installed at the inner end of the culvert wall, a steel plate lining is fixedly installed on the inner wall of the filling grouting layer, chemical anchor bolts are fixedly installed at the inner ends of the filling grouting layer and the steel plate lining, and the filling grouting layer and the steel plate lining are fixedly connected with the filling grouting layer. According to the under-dam drainage culvert reinforcing structure for the hydraulic engineering dam, compaction grouting treatment is carried out on a drainage culvert foundation, then filling grouting compaction is carried out on the contact portions of the drainage culvert and a drainage open channel and a dam body, and therefore the drainage culvert foundation and the drainage open channel can be reinforced. A steel plate lining is adopted for reinforcement, finally backfill grouting is conducted between the steel plate and the culvert body, the structure is stable and firm, compaction grouting pile treatment is conducted on the whole-section foundation of the drainage culvert, the integrity and stability of the culvert foundation are improved, meanwhile, a new ventilation pipe is additionally arranged, and the air inlet requirement of the waterproof culvert is met.

Description

Technical Field

[0001] The invention relates to the field of water conservancy projects, and in particular to a water discharge culvert reinforcement structure under a dam for a water conservancy project dam. Background Art

[0002] A discharge culvert is a hydraulic structure used to discharge water. As an important hydraulic structure, a discharge culvert is an important part of water conservancy projects and plays a vital role in the safe operation and management of water conservancy projects. Through the reasonable design, construction and operation management of the discharge culvert, the benefits of water conservancy projects can be improved and their service life can be extended. The normal operation of the discharge culvert can ensure that the water level is controlled within a reasonable range and avoid dangerous situations such as over-storage and dam breach. At the same time, regular inspection and maintenance of the discharge culvert can timely discover and deal with potential safety hazards and ensure the safe and stable operation of water conservancy projects.

[0003] After the culvert has been safety assessed and inspected on site, if the culvert affects the main dam, the structure of the discharge building and the safety of seepage, the culvert needs to be reinforced using a reinforcement structure. Therefore, we propose a reinforcement structure for the discharge culvert under the dam of a water conservancy project dam to solve the above-mentioned problems. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a reinforcement structure for a water discharge culvert under a dam of a water conservancy project dam, which can solve the technical problem that when the culvert affects the structure and seepage safety of the main dam and the water discharge building after safety appraisal and on-site investigation, the culvert needs to be reinforced using a reinforcement structure.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a culvert wall, a filling grouting layer is fixedly installed on the inner end of the culvert wall, a steel plate lining is fixedly installed on the inner wall of the filling grouting layer, a chemical anchor is fixedly installed on the inner ends of the filling grouting layer and the steel plate lining, a concrete layer is fixedly installed on the lower end of the culvert wall, a grouting pipe is fixedly installed on the inner end of the filling grouting layer, a repeatable grouting pipe is fixedly installed on the inner end of the filling grouting layer, and the inner end of the culvert wall is opened. There are first-order holes, second-order holes are opened at the inner end of the culvert wall, a filling grouting range is arranged on the outer side of the culvert wall, a water cut-off ring is installed at the inner end of the culvert wall, a grouting pile is installed at the lower end of the culvert wall, an original air vent is installed at the inner end of the culvert wall, a new ventilation pipe is installed at the inner end of the culvert wall, a steel pipe clamp is fixedly installed at the outer end of the new ventilation pipe, a bolt is threadedly connected to the inner end of the steel pipe clamp, a stopper is arranged at the outer end of the steel pipe clamp, and a suspension rod is arranged at the outer end of the bolt.

[0006] As a preferred technical solution of the present invention, the outer side of the culvert wall is provided with dam body backfill compacted soil, the top of the dam body backfill compacted soil is provided with a dam slope hole, and the inner end of the dam body backfill compacted soil is provided with a grouting hole.

[0007] As a preferred technical solution of the present invention, the outer end of the grouting pile is provided with silty silt, the outer end of the grouting pile is provided with loess-like loam, and the silty silt is located at the upper end of the loess-like loam.

[0008] As a preferred technical solution of the present invention, the first-order holes and the second-order holes are arranged in a plum blossom shape with a spacing of two meters.

[0009] As a preferred technical solution of the present invention, the steel pipe clamps are arranged in groups at intervals of two meters at the outer end of the new ventilation pipe.

[0010] As a preferred technical solution of the present invention, a working bridge is arranged on the upper side of the culvert wall, and the top end of the steel pipe clamp is arranged on the lower side of the working bridge.

[0011] As a preferred technical solution of the present invention, the filling grouting layer is first blown with pea gravel and then backfilled with grouting, and the bottom end of the filling grouting layer is fixedly connected to the concrete layer.

[0012] As a preferred technical solution of the present invention, the bottom end of the new ventilation pipe is connected to a hole at the top of the culvert two meters behind the gradual change section of the culvert wall.

[0013] Compared with the prior art, the present invention can achieve the following beneficial effects: The foundation of the discharge culvert is treated with compaction grouting, and then the contact parts of the discharge culvert and the discharge open channel with the dam body are filled and grouted to make them dense, and reinforced with steel plate lining. Finally, backfill grouting is performed between the steel plate and the cave body. The structure is stable and reliable. The foundation of the entire discharge culvert is treated with compaction grouting piles to improve the integrity and stability of the culvert foundation. At the same time, a new ventilation pipe is added to meet the air intake requirements of the waterproof culvert. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the cross-sectional structure of the reinforcement structure of the water discharge culvert under the dam of a water conservancy project dam according to the present invention; Figure 2 This is a schematic diagram of the backfill grouting structure of the water discharge culvert reinforcement structure under the dam of a water conservancy project dam used in the present invention; Figure 3 It is a schematic diagram of the grouting structure for filling the hole wall of the water discharge culvert reinforcement structure under the dam of a water conservancy project dam according to the present invention; Figure 4 It is a schematic diagram of the planar structure of the grouting piles used for the reinforcement structure of the water discharge culvert under the dam of a water conservancy project according to the present invention; Figure 5It is a schematic diagram of the side cross-sectional structure of the grouting piles used for the reinforcement structure of the water discharge culvert under the dam of a water conservancy project according to the present invention; Figure 6 This is a schematic diagram of a new ventilation pipe installation structure for a reinforcement structure of a water discharge culvert under a dam of a water conservancy project according to the present invention; Figure 7 This is a schematic diagram of the installation structure of the steel pipe clamp for reinforcing the water discharge culvert under the dam of a water conservancy project according to the present invention; Figure 8 It is a schematic diagram of a top view of a steel pipe clamp for reinforcing a water discharge culvert under a dam of a water conservancy project according to the present invention; Fig. 9 This is a schematic diagram of the front cross-sectional structure of a grouting pile used for reinforcing the water discharge culvert under a dam of a water conservancy project according to the present invention; Among them: 1. Culvert wall; 2. Filling grouting layer; 3. Steel plate lining; 4. Chemical anchor bolt; 5. Reinforced concrete layer; 6. Backfill pipe; 7. Repeatable grouting pipe; 8. First-order hole; 9. Second-order hole; 10. Filling grouting range; 11. Cut-off ring; 12. Bottom grouting pile; 13. Original air hole; 14. New vent pipe; 15. Steel pipe clamp; 16. Bolt; 17. Block; 18. Hanger; 19. Working bridge; 20. Dam slope hole; 21. Grouting hole; 22. Dam body backfill compacted soil; 23. Silt silt; 24. Loess loam. DETAILED DESCRIPTION

[0015] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0016] Example Please refer to Figure 1-9 As shown, the present invention provides a reinforcement structure of a water discharge culvert under a dam of a water conservancy project. A filling grouting layer 2 is fixedly installed on the inner end of the culvert wall 1. The filling grouting layer 2 is first blown with pea gravel and then backfilled with grouting. The bottom end of the filling grouting layer 2 is fixedly connected to the reinforced concrete layer 5. A steel plate lining 3 is fixedly installed on the inner wall of the filling grouting layer 2. Chemical anchor bolts 4 are fixedly installed on the inner ends of the filling grouting layer 2 and the steel plate lining 3. A reinforced concrete layer 5 is fixedly installed on the lower end of the culvert wall 1. A grouting return pipe 6 is fixedly installed on the inner end of the filling grouting layer 2. A repeatable grouting pipe 7 is fixedly installed on the inner end of the filling grouting layer 2. A first-order hole 8 is provided at the inner end of the culvert wall 1, and a second-order hole 9 is provided at the inner end of the culvert wall 1. The first-order hole 8 and the second-order hole 9 are arranged in a plum blossom shape at a distance of two meters. A filling grouting range 10 is provided on the outer side of the culvert wall 1, and a water cut-off ring 11 is installed at the inner end of the culvert wall 1. The foundation of the discharge culvert is subjected to compaction grouting treatment, and then the contact parts of the discharge culvert and the discharge open channel with the dam body are filled and grouted to be dense, and reinforced with steel plates. Finally, backfill grouting is performed between the steel plate and the cave body, so that the structure is stable and reliable, and the reinforcement effect is remarkable; The lower end of the culvert wall 1 is provided with a bottom grouting pile 12, the inner end of the culvert wall 1 is provided with an original vent hole 13, the inner end of the culvert wall 1 is provided with a new ventilation pipe 14, the outer end of the new ventilation pipe 14 is fixedly provided with a steel pipe clamp 15, the inner end of the steel pipe clamp 15 is threadedly connected with a bolt 16, the outer end of the steel pipe clamp 15 is provided with a stopper 17, and the outer end of the bolt 16 is provided with a hanger 18. The outer side of the culvert wall 1 is provided with a dam body backfill compacted soil 22, the top of the dam body backfill compacted soil 22 is provided with a dam slope hole 20, and the inner end of the dam body backfill compacted soil 22 is provided with a grouting hole 21. The outer end of the bottom grouting pile 12 is provided with a silty silt 23, and the outer end of the bottom grouting pile 12 is provided with a loess-like loam 24, and the silty silt 23 is located at the upper end of the loess-like loam 24. A group of steel pipe clamps 15 are provided at the outer end of the new ventilation pipe 14 every two meters. A working bridge 19 is provided on the upper side of the culvert wall 1, and the top end of the steel pipe clamp 15 is provided on the lower side of the working bridge 19. The bottom end of the new ventilation pipe 14 is connected to a hole at the top of the cave two meters after the gradual section of the culvert wall 1. The foundation of the entire section of the drainage culvert is treated with compacted grouting piles to improve the integrity and stability of the culvert foundation. At the same time, a new ventilation pipe 14 is added to meet the air intake requirements of the waterproof culvert.

[0017] Specific working principle: like Figure 1 , Figure 2 and Figure 3As shown in the figure, the reinforcement structure of the water discharge culvert under the dam of the water conservancy project is used. In order to retain the flow capacity of the original hole as much as possible, the inner lining of the water discharge tunnel is reinforced by the original hole wall filling grouting treatment, foundation compaction grouting pile treatment, and steel plate reinforcement scheme. During the construction of the filling grouting layer 2 and the steel plate lining 3, the steel plate lining 3 is prefabricated and installed first, and then fixed with chemical anchor bolts 4, and then the filling grouting layer 2 is blown with pea gravel and backfilled with grouting, and then the filling grouting layer 2 is checked and supplemented; backfilling The grouting adopts a repeatable grouting pipe 7, and special joints and conduits are respectively inserted into the two ends of the grouting pipe. One end is used as a grouting hole, and the other end is used as an exhaust and return hole. Grouting starts from one end of the conduit, and after the air in the pipe is exhausted and the slurry is discharged from the other end of the conduit, it is sealed. At this time, the slurry will be discharged from the entire section of the grouting pipe and injected into the gap until the grouting is dense. After the grouting is completed, the residual slurry in the grouting pipe is immediately cleaned with clean water or compressed air to prepare for the next repeated grouting.

[0018] like Figure 1 , Figure 2 and Figure 3 As shown, the grouting range of the first-order hole 8 and the second-order hole 9 is the side wall of the drainage culvert, the arch and the bottom of the steep slope open channel, and the one meter set by the filling grouting range 10. The first-order hole 8 and the second-order hole 9 are arranged in a plum blossom shape. The filling grouting uses cement slurry. The grouting holes are directly drilled. The grouting adopts the pure pressure grouting method, which is divided into two sequences. The first-order hole 8 uses 0.5-level water-cement ratio slurry, and the second-order hole 9 uses 1.0-level water-cement ratio slurry. The second-order hole 9, including the top hole grouting material, uses pure cement slurry. The backfill grouting construction starts from the lower end and advances to the higher end. The same sequence hole in the same section can be fully or partially drilled out before grouting, or a single hole can be drilled and grouted in sequence; like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the bottom grouting piles 12 use three rows of compacted grouting piles, which are arranged in an equilateral triangle. The grouting depth is 16m below the concrete layer of the bottom plate of the hole, penetrating the siltation layer and penetrating into the loess-like loam 24 with good bearing capacity. The rows of compacted grouting piles on the grouting holes 21 on both sides are arranged at a distance of 85cm from the outside of the side wall concrete layer. Grouting is performed from the hole 20 on the dam slope. The original air hole 13 is a PVC pipe. A new ventilation pipe 14 is added to the reinforced structure. A steel pipe clamp 15 is set along the outer wall of the discharge tower for fixation. The end of the new ventilation pipe 14 extends to the working bridge 19 of the discharge tower, and an elbow is set to prevent impurities from entering the pipe. The above completes a series of operations of the reinforcement structure of the discharge culvert under the dam for the water conservancy project dam. The content not described in detail in this description belongs to the existing technology known to professional and technical personnel in this field.

[0019] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A reinforcement structure for a water discharge culvert under a dam of a water conservancy project, comprising: A culvert wall (1), characterized in that: a filling grouting layer (2) is fixedly installed on the inner end of the culvert wall (1), a steel plate lining (3) is fixedly installed on the inner wall of the filling grouting layer (2), a chemical anchor bolt (4) is fixedly installed on the inner ends of the filling grouting layer (2) and the steel plate lining (3), a reinforced concrete layer (5) is fixedly installed on the lower end of the culvert wall (1), a return grouting pipe (6) is fixedly installed on the inner end of the filling grouting layer (2), a repeatable grouting pipe (7) is fixedly installed on the inner end of the filling grouting layer (2), a first-order hole (8) is opened on the inner end of the culvert wall (1), and a second-order hole (8) is opened on the inner end of the culvert wall (1). A hole (9) is provided on the outer side of the culvert wall (1), a filling grouting range (10) is provided, a water cut-off ring (11) is installed at the inner end of the culvert wall (1), a bottom grouting pile (12) is installed at the lower end of the culvert wall (1), an original air vent (13) is installed at the inner end of the culvert wall (1), a new ventilation pipe (14) is installed at the inner end of the culvert wall (1), a steel pipe clamp (15) is fixedly installed at the outer end of the new ventilation pipe (14), a bolt (16) is threadedly connected to the inner end of the steel pipe clamp (15), a stopper (17) is provided at the outer end of the steel pipe clamp (15), and a suspension rod (18) is provided at the outer end of the bolt (16).

2. The reinforcement structure of the water discharge culvert under the dam for a water conservancy project according to claim 1 is characterized in that: The outer side of the culvert wall (1) is provided with dam body backfill compacted soil (22), the top of the dam body backfill compacted soil (22) is provided with a dam slope hole (20), and the inner end of the dam body backfill compacted soil (22) is provided with a grouting hole (21).

3. The reinforcement structure of the water discharge culvert under the dam for a water conservancy project according to claim 1 is characterized in that: The outer end of the bottom grouting pile (12) is provided with silty silt (23), and the outer end of the bottom grouting pile (12) is provided with loess-like loam (24), and the silty silt (23) is located at the upper end of the loess-like loam (24).

4. The reinforcement structure of the water discharge culvert under the dam for a water conservancy project according to claim 1 is characterized in that: The first-order holes (8) and the second-order holes (9) are arranged in a plum blossom shape at a spacing of two meters.

5. The reinforcement structure of the water discharge culvert under the dam for a water conservancy project according to claim 1 is characterized in that: The steel pipe clamps (15) are arranged in groups at intervals of two meters at the outer end of the new ventilation pipe (14).

6. The reinforcement structure of the water discharge culvert under the dam for a water conservancy project according to claim 1, characterized in that: A working bridge (19) is arranged on the upper side of the culvert wall (1), and the top end of the steel pipe clamp (15) is arranged on the lower side of the working bridge (19).

7. The reinforcement structure of the water discharge culvert under the dam for a water conservancy project according to claim 1, characterized in that: The filling grouting layer (2) is first filled with pea gravel and then backfilled with grouting, and the bottom end of the filling grouting layer (2) is fixedly connected to the reinforced concrete layer (5).

8. The reinforcement structure of the water discharge culvert under the dam for a water conservancy project according to claim 1, characterized in that: The bottom end of the new ventilation pipe (14) is connected to a hole at the top of the culvert two meters behind the gradual change section of the culvert wall (1).

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