Net-shaped drainage body of heightened gravity dam
The mesh drainage system addresses dam uplift pressure and temperature-induced cracking by forming a mesh structure with prefabricated drainage pipes to effectively discharge seepage, enhancing dam stability and reducing uplift pressure.
Patent Information
- Application Number
- CN202420835910.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-22
- Publication Date
- 2024-12-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Heightening a dam increases uplift pressure and temperature-induced cracking, leading to ineffective water seepage discharge through existing vertical drainage pipes.
A mesh drainage system comprising vertical and horizontal drainage pipes connected by prefabricated cross members, forming a mesh structure within the dam to gather and discharge seepage from all directions, using porous concrete materials.
Enhances anti-seepage performance, reduces uplift pressure, and ensures efficient water discharge from cracks, improving dam stability and durability.
Smart Images
Figure CN222139933U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gravity dam engineering, in particular to a heightened gravity dam mesh drainage body. Background Art
[0002] Heightening a dam is the main means of increasing the capacity and efficiency of an existing reservoir, and is considered an economical and practical way to redevelop a water conservancy project. For a heightened gravity dam, the uplift pressure on the dam body increases significantly after the dam body is heightened and thickened, affecting the dam's anti-sliding stability. In addition, after the new concrete is poured, it tends to shrink as the temperature continues to drop. Under the constraint of the old concrete, it will crack and produce temperature cracks, and the water seepage from the cracks in the dam body will increase. The direction of the cracks is often not single, which makes the original vertical drainage pipes of the dam body may not meet the requirements for discharging crack seepage.
[0003] Therefore, it is urgent to solve the above problems. Utility Model Content
[0004] Purpose of the utility model: The purpose of the utility model is to propose a mesh drainage device for a heightened gravity dam that can improve the anti-seepage performance of the heightened gravity dam, reduce the uplift pressure of the dam body, and further discharge water seepage from cracks in all directions of the dam body caused by temperature stress and other reasons.
[0005] Technical solution: To achieve the above objectives, the utility model discloses a mesh drainage body for a heightened gravity dam, comprising a mesh drainage body located in a new dam and used to gather water seeping out of the dam body when the dam body cracks, and a dam body drainage gallery located in the new dam and connected to the mesh drainage body and used to discharge the water seeping out of the dam body, wherein the mesh drainage body comprises a plurality of rows of vertical drainage pipes vertically inserted in the new dam, a plurality of rows of horizontal drainage pipes horizontally arranged in the new dam, and a prefabricated cross member for connecting the vertical drainage pipes and the horizontal drainage pipes, the vertical drainage pipes and the horizontal drainage pipes are spliced together through the prefabricated cross member to form a mesh structure, wherein the prefabricated cross member is a cross-shaped pipe joint.
[0006] Among them, the vertical drainage pipes are arranged along the upstream side of the drainage gallery wall of the new dam. At least two rows of vertical drainage pipes are arranged in each dam section, and the distance between adjacent vertical drainage pipes is 3 to 5 meters.
[0007] Preferably, the vertical drain pipe and the horizontal drain pipe have an outer diameter of 30 to 35 cm, an inner diameter of 20 to 25 cm, and a wall thickness of 5 to 10 cm.
[0008] Furthermore, each section of the thin water pipe of the prefabricated cross member has a length of 30 to 50 cm, an outer diameter of the thin water pipe of 15 to 20 cm, an inner diameter of the thin water pipe of 10 to 15 cm, and a wall thickness of the thin water pipe of 2.5 to 5 cm.
[0009] Furthermore, the interfaces of the prefabricated cross members are all provided with a slope of 1:0.5.
[0010] Preferably, a groove is provided on the outer wall of the interface of the prefabricated cross member, and an elastic slurry-stopping ring is provided in the groove, and the maximum distance of the elastic slurry-stopping ring is greater than the inner diameter of the vertical drainage pipe and the horizontal drainage pipe.
[0011] Furthermore, when splicing the mesh drainage body, the interfaces of the prefabricated cross-body components that are not connected to the vertical drainage pipes or the horizontal drainage pipes are blocked with slurry stoppers.
[0012] Furthermore, each time a row of horizontal drainage pipes is spliced, a layer of mortar is spread on the surface of the horizontal drainage pipes, and a corresponding layer of concrete of a new dam is poured.
[0013] Preferably, the height interval between each row of horizontal drainage pipes is 3 to 5 m, and adjacent horizontal drainage pipes are connected by prefabricated casings, and the inner diameter of the prefabricated casings is larger than the outer diameter of the horizontal drainage pipes.
[0014] Furthermore, the vertical drainage pipe, the horizontal drainage pipe, the prefabricated cross member and the prefabricated casing are all porous concrete pipes.
[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages: first, the utility model assembles and splices the vertical drainage pipe and the horizontal drainage pipe through prefabricated cross components and prefabricated sleeves to form a mesh structure, and combines with the dam body drainage corridor to form a set of systematic and sustainable drainage devices, which can further discharge the seepage from cracks in all directions caused by temperature stress and other reasons from the dam body, meet the requirements of improving the anti-seepage performance of the heightened gravity dam and reducing the uplift pressure of the dam body, and discharge the water from the upstream of the dam body as much as possible; secondly, the entire drainage device of the utility model is located inside the dam body, which effectively avoids direct erosion by water flow and improves the durability of the device; finally, the drainage pipe used in the utility model is a prefabricated porous concrete material, which is convenient for structural arrangement, can improve construction efficiency and reduce project cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a cross-sectional schematic diagram of the heightened gravity dam of the utility model;
[0017] Figure 2 It is an elevation view of the upstream of the dam where the mesh drainage body in the utility model is arranged;
[0018] Figure 3 It is a detailed structural diagram of the cross section of the cross body in the utility model;
[0019] Figure 4 It is a schematic diagram of the cross-section splicing of the mesh drainage body in the utility model and a working process diagram;
[0020] Marked in the figure are: new dam 1, mesh drainage body 2, drainage gallery 3, vertical drainage pipe 4, horizontal drainage pipe 5, prefabricated cross member 6, elastic stop ring 7, stop plug 8, prefabricated casing 9, old dam 10. DETAILED DESCRIPTION
[0021] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.
[0022] like Figure 1 and Figure 2 As shown, the utility model is a kind of elevated gravity dam mesh drainage body. A mesh drainage body 2 is arranged on the upstream side of the drainage gallery 3 wall of the new dam 1. The mesh drainage body 2 includes vertical drainage pipes 4, horizontal drainage pipes 5 and prefabricated cross-body components 6. Before pouring the concrete new dam 1, the vertical drainage pipes 4 are pre-buried on the upstream side of the drainage gallery 3 wall of the new dam 1. The vertical drainage pipes 4 are arranged in 2 rows in each dam section, with a spacing of 3 to 5 meters. During construction, a row of horizontal drainage pipes 5 is laid after each layer of concrete is poured. The height of each row of horizontal drainage pipes 5 is 3 to 5 meters apart. After laying the horizontal drainage pipes 5, the surface is plastered with mortar, which is beneficial to improve the bonding strength between the mesh drainage body 2 and the poured concrete. Adjacent horizontal drainage pipes 5 are connected with prefabricated sleeves 9. The inner diameter of the prefabricated sleeves 9 is slightly larger than the outer diameter of the drainage pipe to adapt to the uncertain splicing position of the horizontal drainage pipes during construction, such as Figure 3 and Figure 4 As shown. The vertical drain pipe 4 and the horizontal drain pipe 5 are 30 to 35 cm long, with an inner diameter of 20 to 25 cm and a wall thickness of 5 to 10 cm. The vertical drain pipe 4 and the horizontal drain pipe 5 are assembled and spliced by a prefabricated cross member 6. The prefabricated cross member 6 is a cross-shaped pipe joint. The length of each thin drainage pipe section of the cross-shaped pipe joint is about 15 to 20 cm of the outer diameter of the thin water pipe, the inner diameter of the thin water pipe is 10 to 15 cm, and the wall thickness of the thin water pipe is 2.5 to 5 cm. The joint of the prefabricated cross member 6 is set with a slope of about 1:0.5, which is convenient for assembling and splicing the drainage pipe during construction. The outer wall of the joint is provided with a groove, and an elastic slurry stop ring 7 is provided in the groove. The maximum distance of the elastic slurry stop ring 7 at the joint is slightly larger than the inner diameter of the drainage pipe, which can not only facilitate the splicing of the drainage pipe, but also prevent excessive cement mortar from entering the drainage pipe during construction and affecting the drainage effect. When splicing the drainage pipe, the joints of the prefabricated cross member 6 are blocked with a grout stopper 8 to ensure that the cement mortar does not leak into the mesh drainage body. The vertical drainage pipe 4, the horizontal drainage pipe 5, the prefabricated cross member 6 and the prefabricated casing 9 are all made of porous concrete material, which is a brittle material with good water permeability, which can make the crack seepage quickly penetrate into the drainage pipe, so as to be discharged from the dam body in time.
[0023] When cracks in different directions are generated in the dam body due to temperature stress and other reasons, corresponding cracks are also generated in the drainage pipes in the mesh drainage body 2, and the seepage water in the cracks can be quickly gathered in the mesh drainage body 2. The mesh drainage body 2 discharges the seepage water out of the dam body in time by combining with the dam body drainage gallery 3, effectively reducing the uplift pressure of the dam body and ensuring the stable operation of the dam.
[0024] In the above-mentioned embodiment, taking into account the current construction characteristics of the raised gravity dam foundation, in order to simplify the construction process, improve construction efficiency, reduce project costs, and ensure the drainage function of the drainage device and the effectiveness of its service life, the utility model assembles and splices the vertical drainage pipe 4 and the horizontal drainage pipe 5 through a prefabricated cross member 6 and a prefabricated sleeve 9 to form a mesh structure, and combines it with the dam body drainage corridor 3 to form a set of systematic and sustainable drainage devices, which can further discharge water seepage from cracks in all directions caused by temperature stress and other reasons from the dam body, thereby meeting the requirements of improving the anti-seepage performance of the raised gravity dam and reducing the uplift pressure of the dam body. Before pouring the new concrete dam 1, the utility model pre-buries the vertical drainage pipe 4 on the upstream side of the wall of the drainage gallery 3 of the new dam, and during construction, a row of horizontal drainage pipes 5 is laid after each layer of concrete is poured. The vertical drainage pipes 4 and the horizontal drainage pipes 5 are assembled and spliced through prefabricated cross-body components 6 and prefabricated sleeves 9 to form a mesh structure. The mesh drainage body 2 and the drainage gallery 3 are used for joint drainage, thereby achieving the effect of reducing the uplift pressure of the dam body, improving the anti-seepage performance of the heightened dam, ensuring the safety of the dam, and having practical significance and good application prospects.
Claims
1. A heightened gravity dam mesh drainage body, It is characterized in that The invention comprises a mesh drainage body (2) located in a new dam (1) and used to collect water seepage when the dam body cracks, and a dam body drainage gallery (3) located in the new dam and connected to the mesh drainage body and used to discharge the water seepage from the dam body, wherein the mesh drainage body (2) comprises a plurality of rows of vertical drainage pipes (4) vertically inserted in the new dam, a plurality of rows of horizontal drainage pipes (5) horizontally arranged in the new dam, and a prefabricated cross member (6) used to connect the vertical drainage pipes and the horizontal drainage pipes, and the vertical drainage pipes (4) and the horizontal drainage pipes (5) are spliced together by the prefabricated cross member (6) to form a mesh structure, wherein the prefabricated cross member (6) is a cross-shaped pipe joint.
2. A heightened gravity dam mesh drainage body according to claim 1, It is characterized in that The vertical drainage pipes (4) are arranged along the upstream side of the drainage gallery (3) wall of the new dam (1), at least two rows of vertical drainage pipes (4) are arranged in each dam section, and the spacing between adjacent vertical drainage pipes (4) is 3 to 5 meters.
3. A heightened gravity dam mesh drainage body according to claim 1, It is characterized in that The vertical drainage pipe (4) and the horizontal drainage pipe (5) have an outer diameter of 30 to 35 cm, an inner diameter of 20 to 25 cm, and a wall thickness of 5 to 10 cm.
4. A heightened gravity dam mesh drainage body according to claim 1, It is characterized in that Each section of the thin water pipe of the prefabricated cross member (6) has a length of 30 to 50 cm, an outer diameter of the thin water pipe of 15 to 20 cm, an inner diameter of the thin water pipe of 10 to 15 cm, and a wall thickness of 2.5 to 5 cm.
5. The elevated gravity dam mesh drainage body according to claim 1, It is characterized in that The interfaces of the prefabricated cross member (6) are all provided with a slope of 1:0.
5.
6. A heightened gravity dam mesh drainage body according to claim 1, It is characterized in that A groove is provided on the outer wall of the interface of the prefabricated cross member (6), and an elastic slurry-stopping ring (7) is provided in the groove. The maximum distance of the elastic slurry-stopping ring (7) is greater than the inner diameters of the vertical drainage pipe (4) and the horizontal drainage pipe (5).
7. The elevated gravity dam mesh drainage body according to claim 1, It is characterized in that When splicing the mesh drainage body (2), the interfaces of the prefabricated cross-body components (6) that are not connected to the vertical drainage pipe (4) or the horizontal drainage pipe (5) are blocked with slurry stoppers (8).
8. The elevated gravity dam mesh drainage body according to claim 1, It is characterized in that When each row of horizontal drainage pipes (5) is spliced, a layer of mortar is spread on the surface of the horizontal drainage pipes (5), and a corresponding layer of concrete of a new dam is poured.
9. The elevated gravity dam mesh drainage body according to claim 1, It is characterized in that The height interval between each row of the horizontal drainage pipes (5) is 3 to 5 m. Adjacent horizontal drainage pipes (5) are connected by prefabricated sleeves (9). The inner diameter of the prefabricated sleeves (9) is larger than the outer diameter of the horizontal drainage pipes (5).
10. A heightened gravity dam mesh drainage body according to claim 9, It is characterized in that The vertical drainage pipe (4), the horizontal drainage pipe (5), the prefabricated cross member (6) and the prefabricated sleeve (9) are all porous concrete pipes.