Connecting structure for concrete bottom plate foundation and diaphragm wall of low-water-head movable gate dam
By setting deformation joints, water stops, concrete cushions and flexible fillers in the connection structure between the bottom plate of the gate and the anti-seepage wall, the construction difficulty and anti-seepage performance of the traditional connecting structure are solved, and an efficient and environmentally friendly anti-seepage effect is achieved.
Patent Information
- Application Number
- CN202421914300.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-08
AI Technical Summary
The connection between the traditional dam base plate and the anti-seepage wall is difficult to construct, difficult to operate, and unenvironmental. It is easy to crack when the temperature changes, and it is difficult to bond.
The connection structure between the bottom plate of the gate and the anti-seepage wall is adopted, where the anti-seepage wall is set at the bottom of the bottom plate of the gate and the deformation joints and water stops are set. A concrete cushion layer is poured on the front and rear sides of the upper part of the anti-seepage wall, and flexible filler is laid on the top, and a water stop is opened on one side of the concrete cushion layer.
It realizes the effective connection between the bottom plate of the dam and the anti-seepage wall, reduces the difficulty of construction, improves the anti-seepage performance, adapts to temperature changes, avoids cracking problems, and meets the construction requirements of anti-seepage of hydraulic buildings.
Smart Images
Figure CN222878624U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of anti-seepage of hydraulic structures, in particular to a connection structure for a concrete bottom plate foundation and an anti-seepage wall of a low-head movable dam. Background Art
[0002] Constructing an ecological water storage project of movable dams in the river channel, erecting dams to store water in the non-flood season improves the ecological environment of the river channel, creates a diverse habitat in the river bank, improves the utilization rate of water resources, and greatly improves the image and taste of the city; the dam collapse operation during the flood season does not affect the safe flood discharge of the river channel, effectively protects the flood control safety of the coastal cities, and has a significant effect on the construction of ecological civilization. For dams with sand and gravel foundations, due to the strong permeability of the foundation, it is easy to leak and penetrate damage. The bottom plate of the dam needs to be equipped with an anti-seepage wall, and a precast concrete sheet pile anti-seepage wall or a cast-in-place concrete continuous wall solution is used to ensure the safe operation of the dam. The connection structure between the bottom plate of the dam and the anti-seepage wall is usually filled with petroleum asphalt, which is difficult to construct, difficult to operate, and not environmentally friendly; and the asphalt has a high hardness, is prone to cracking when the temperature changes greatly, and is difficult to bond at the overlap. Utility Model Content
[0003] In view of the above-mentioned problems existing in the connection between the bottom plate of the conventional dam and the anti-seepage wall, the present utility model is proposed.
[0004] Therefore, the utility model aims to provide a connection structure between the concrete bottom plate foundation and the anti-seepage wall of a low-head movable dam, which solves the technical problem of connecting the traditional dam bottom plate and the anti-seepage wall.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A connection structure for a concrete slab foundation of a low-head movable dam and an anti-seepage wall, comprising a dam slab and a group of anti-seepage walls matching the span of the dam slab structure, characterized in that the anti-seepage wall is arranged at the bottom of the dam slab, expansion joints are arranged between the blocks of the dam slab, waterstops are arranged between the expansion joints, concrete cushion layers are cast on the front and rear sides of the upper part of the anti-seepage wall, a flexible filler extending downward along the front and rear sides thereof to the concrete cushion layer is laid on the top of the anti-seepage wall, and a waterstop pit is opened on one side of the concrete cushion layer.
[0007] The anti-seepage wall is a prefabricated concrete sheet pile anti-seepage wall or a cast-in-place concrete anti-seepage wall.
[0008] The two ends of the upper part of the prefabricated concrete sheet pile anti-seepage wall are provided with grooves, and the gap between the grooves and the two anti-seepage walls is filled with cement slurry.
[0009] The cast-in-place concrete anti-seepage wall is poured in sections, and the construction gaps should be roughened and waterstop strips should be provided.
[0010] Preferably, the water stop pit has a depth of 20 to 30 cm and a bottom width of 20 to 30 cm.
[0011] Preferably, the waterstop is 10 cm to 15 cm away from the upstream surface of the dam bottom plate, and the waterstop is a rubber waterstop.
[0012] Preferably, the pouring thickness of the concrete cushion layer is 10 cm and the strength is C15.
[0013] In the above technical solution, the technical effects and advantages provided by the utility model are:
[0014] The utility model uses static pressure piling to drive precast concrete sheet piles into the foundation in sequence, and the gaps in the double grooves on the upper part of the sheet piles are used to pour cement slurry 4 into the gaps through a conduit to form a complete anti-seepage structure; or a continuous cast-in-place anti-seepage wall can be cast in sections of 10 to 15 meters, and the construction joints should be roughened and provided with rubber waterstops to form a continuous anti-seepage body. After laying flexible fillers on the top and sides of the anti-seepage wall, the concrete construction of the dam bottom plate can be carried out. The rubber waterstop at the deformation joint of the dam bottom plate is firmly attached to the top and side walls of the anti-seepage wall and buried below the bottom surface of the cushion layer. The flexible fillers and rubber waterstops make the entire structure meet the construction requirements of hydraulic construction anti-seepage. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.
[0016] Figure 1 It is a planar application schematic diagram of the utility model in a connection structure between a concrete bottom plate foundation and an anti-seepage wall of a low-head movable dam;
[0017] Figure 2 It is a top view of the anti-seepage wall of the connection structure between the concrete bottom plate foundation and the anti-seepage wall of the utility model used for low-head movable dam;
[0018] Figure 3 yes Figure 1 AA cross-sectional diagram of ;
[0019] Figure 4 yes Figure 3 A partial enlarged schematic diagram of position A in the middle;
[0020] Figure 5 yes Figure 1 BB cross-sectional diagram;
[0021] Figure 6 yes Figure 5 A partial enlarged schematic diagram of position B in the middle.
[0022] Description of reference numerals:
[0023] In the figure: 1. Anti-seepage wall; 2. Dam bottom plate; 3. Expansion joint; 4. Cement slurry; 5. Flexible filler; 6. Concrete cushion layer; 7. Waterstop; 8. Waterstop pit. DETAILED DESCRIPTION
[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0025] The utility model embodiment discloses a connection structure for a concrete bottom plate foundation and an anti-seepage wall of a low-head movable dam.
[0026] Reference Figure 1-6 , used for the connection structure of the concrete bottom plate foundation and the anti-seepage wall of the low-head movable dam, comprising a dam bottom plate 2 and a group of anti-seepage walls 1 matching the structural span of the dam bottom plate 2, the anti-seepage wall 1 being arranged at the bottom of the dam bottom plate 2, the dam bottom plate 2 adopts an independent dam plate with strong deformation capacity to adapt to foundation settlement, the segment length on the rock foundation is 15m-20m, and the segment length on the soil foundation is 20m-30m, a deformation joint 3 is arranged between the two blocks of the dam bottom plate, a water stop strip 7 is arranged between the deformation joints 3, a concrete cushion layer 6 is cast on the front and rear sides of the upper part of the anti-seepage wall 1, a flexible filler 5 extending downward along the front and rear sides thereof to the concrete cushion layer 6 is laid on the top of the anti-seepage wall 1, and a water stop pit 8 is opened on one side of the concrete cushion layer 6.
[0027] The flexible filler 5 is an SR flexible filler. The SR flexible filler has deformability and fluidity. It can flow under water pressure and squeeze into the seam to stop water. It has strong anti-seepage performance and can seal and stop pores and gaps. The SR flexible filler also has bonding properties, and its bonding strength with concrete is greater than the tensile strength of the material itself, which can ensure that the bonding interface is not damaged under various working conditions.
[0028] The pit depth of the water stop pit 8 is 20 to 30 cm, and the bottom width is 20 to 30 cm.
[0029] The water stop strip 7 is 10 cm to 15 cm away from the upstream surface of the dam bottom plate 2. Preferably, the water stop strip 7 is a 651 type rubber water stop strip.
[0030] The pouring thickness of the concrete cushion layer 6 is 10 cm and the strength is C15. Embodiment 1
[0031] The anti-seepage wall 1 is a prefabricated concrete sheet pile. The two ends of the upper part of the prefabricated concrete sheet pile anti-seepage wall are provided with grooves, and the gap between the two anti-seepage walls is filled with cement slurry 4. Embodiment 2
[0032] The anti-seepage wall 1 is a cast-in-place concrete wall, which is cast in sections. The construction gaps should be roughened and a water stop strip 7 should be provided.
[0033] In the utility model, during construction, the following steps are included:
[0034] Step 1: Foundation excavation: First, according to the location of the dam body, the foundation surface is excavated to the designed elevation, and the lateral extension length matches the span of the main gate chamber of the superstructure.
[0035] Step 2-1, precast concrete sheet pile anti-seepage wall: locate the centerline of the precast concrete sheet piles, and after the precast concrete sheet piles are transported to the site, they are driven into the foundation by a pile driver using static pressure; cement slurry is poured into the gap in the upper groove between the two precast concrete sheet piles; the cement slurry is poured into the cavity through a conduit, and the cavity is filled with the slurry through pressure grouting, and penetrates into the surrounding soil and the precast concrete sheet piles to form a complete anti-seepage structure.
[0036] Step 2-2, cast-in-place concrete anti-seepage wall can also be used: After the site is leveled, the foundation of the anti-seepage wall is excavated, and attention is paid to drainage during the construction process, and the concrete anti-seepage wall is cast. The permeability coefficient of the anti-seepage wall concrete is not greater than 1×10 cm / s. After each layer of concrete reaches the design strength, the original soil on both sides is backfilled in time, and the relative density is not less than 0.75. The anti-seepage wall is cast in sections of 10 to 15 meters. The construction joints should be roughened and 651-type rubber waterstops should be installed to form a continuous anti-seepage structure.
[0037] The technical solution of the utility model is also characterized in that:
[0038] In step 2-1, a grouting tube with a diameter of 30-40 mm and a length of 4-6 m is used for grouting. Grouting holes are drilled on the pipe wall within 1 m of the bottom of the pipe. The cement slurry uses P•O42.5 grade cement with a water-cement ratio of 0.8-1:1. The slurry pressure is controlled at 0.4-0.6 MPa.
[0039] The following steps are also included:
[0040] Step 3, cushion construction: After the cement slurry is filled, pour the concrete cushion 30cm below the top on both sides of the front and back of the anti-seepage wall, with a pouring thickness of 10cm and a concrete cushion strength of C15;
[0041] Step 4: Preparation of SR flexible filler materials: The concrete at the joint with SR flexible filler should be leveled, and the surface should be washed with high-pressure water to remove the dust and sand on the surface. After air drying, the SR flexible filler can be constructed.
[0042] Step 5, SR flexible filler laying: After the cushion layer is poured, SR caulking material is laid on the top and side gaps where the cut-off wall contacts the upper concrete slab. The SR flexible filler extends downward along the front and back sides of the cut-off wall to the concrete cushion layer, and two adjacent SR flexible fillers are overlapped. The thickness of the SR flexible filler at the top of the cut-off wall is 15cm to 20cm, and the width of the two sides is 10cm to 15cm, which is larger than the cross-sectional size of the top of the precast concrete sheet pile.
[0043] Step 6, dam bottom slab casting: After the SR flexible filler material is laid, the dam bottom slab concrete is cast. The SR flexible filler acts as a buffer between the anti-seepage wall and the dam bottom slab concrete. The dam bottom slab casting is carried out in sections according to the design requirements. A 651-type rubber waterstop is set in the middle of the deformation joints formed between the blocks. The waterstop is 10cm to 15cm away from the upstream surface of the bottom slab, and is buried 20 to 30cm below the bottom surface of the cushion layer on the top and side walls of the anti-seepage wall. A C25 concrete waterstop pit is set with a depth of 20 to 30cm and a bottom width of 20 to 30cm as an effective waterstop structure.
[0044] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.
Claims
1. A connection structure for a concrete bottom slab foundation and an anti-seepage wall of a low-head movable dam, comprising a dam bottom slab (2) and a set of anti-seepage walls (1) having a structure span matching that of the dam bottom slab (2), characterized in that: The anti-seepage wall (1) is arranged at the bottom of the dam bottom plate (2), and deformation joints (3) are arranged between the blocks of the dam bottom plate (2). Water stop strips (7) are arranged between the deformation joints (3). Concrete cushion layers (6) are cast on the front and rear sides of the upper part of the anti-seepage wall (1). The top of the anti-seepage wall (1) is paved with flexible fillers (5) extending downward along the front and rear sides to the concrete cushion layer (6), and a water stop pit (8) is opened on one side of the concrete cushion layer (6).
2. The connection structure between the concrete bottom plate foundation and the anti-seepage wall of the low-head movable dam according to claim 1 is characterized in that: The anti-seepage wall (1) is a prefabricated concrete sheet pile anti-seepage wall or a cast-in-place concrete anti-seepage wall.
3. The connection structure between the concrete bottom plate foundation and the anti-seepage wall of the low-head movable dam according to claim 2 is characterized in that: The two ends of the upper part of the prefabricated concrete sheet pile anti-seepage wall are provided with grooves, and the gap between the two anti-seepage walls is filled with cement slurry (4).
4. The connection structure between the concrete bottom plate foundation and the anti-seepage wall of the low-head movable dam according to claim 2 is characterized in that: The cast-in-place concrete anti-seepage wall is cast in sections, and the construction gaps should be roughened and a water stop strip (7) should be provided.
5. The connection structure between the concrete bottom plate foundation and the anti-seepage wall of the low-head movable dam according to claim 1 is characterized in that: The water stop pit (8) has a depth of 20 to 30 cm and a bottom width of 20 to 30 cm.
6. The connection structure between the concrete bottom plate foundation and the anti-seepage wall of the low-head movable dam according to claim 1 is characterized in that: The water stop strip (7) is 10 cm to 15 cm away from the upstream surface of the dam bottom plate (2), and the water stop strip (7) is a rubber water stop strip.
7. The connection structure between the concrete bottom plate foundation and the anti-seepage wall of the low-head movable dam according to claim 1 is characterized in that: The pouring thickness of the concrete cushion layer (6) is 10 cm and the strength is C15.