Anti-seepage wall-toe plate clamping type connecting structure and construction method

Abstract

The invention discloses an anti-seepage wall-toe plate clamping type connecting structure and a construction method in the field of hydroelectric and hydraulic engineering. The anti-seepage wall-toe plate clamping type connecting structure comprises a foundation, the foundation is provided with an anti-seepage wall body, and a connecting structure is arranged between the anti-seepage wall body and a panel; the connecting structure comprises a mortar cushion layer arranged at the upper end of the foundation, and a limiting plate, a connecting plate and a toe plate are sequentially arranged at the upper end of the mortar cushion layer from the diaphragm wall to the panel. The number of the limiting plates is multiple, and the multiple limiting plates are connected in sequence. Each limiting plate is provided with a first end and a second end, the second end of one limiting plate is clamped and matched with the first end of the other limiting plate, a clamping groove is formed in the side, close to the limiting plates, of the anti-seepage wall body, and the first end, closest to the anti-seepage wall body, of the limiting plate is matched with the clamping groove; the connecting plate is provided with an abutting part, and the second end of the limiting plate farthest from the anti-seepage wall body is in abutting fit with the abutting part; the deformation value of the joint between the anti-seepage wall and the first connecting plate is effectively reduced, and meanwhile the problem that a peripheral anti-seepage system generates high stress due to limiting measures is solved.

Description

Technical Field

[0001] This invention relates to the field of hydropower and water conservancy engineering, and in particular to a seepage-proof wall-toe plate interlocking connection structure and construction method. Background Technology

[0002] During construction and water storage operation of high dams on foundations with deep overburden, the concrete-faced dam seepage prevention system will experience uneven settlement deformation. To ensure the integrity of the concrete-faced dam seepage prevention system and meet seepage prevention requirements, the seepage prevention system must be rationally segmented according to the possible deformation of the dam body and foundation to accommodate uneven deformation. In particular, the uneven deformation difference between the ultra-deep cutoff wall and the toe slab on deep overburden is large, requiring multiple connecting plates to coordinate deformation. The conventional connection structure between the cutoff wall and the toe slab uses flat connecting plates. The structural joints between connecting plates and between the connecting plates and the concrete cutoff wall are all vertical joints, which are then connected into a whole structure through joint sealing. Often, the deformation difference between the cutoff wall and the first connecting plate is too concentrated and large, making it difficult for conventional joint sealing to meet design requirements. For example, patent document CN117328412B discloses a structural design and construction method to improve the connection safety between the toe plate of the cover dam and the cutoff wall. The cutoff wall is supported by a corbel-shaped structure, which reduces the settlement deformation of the local soil on the downstream side of the cutoff wall. This prevents the uneven deformation caused by the difference in modulus between the cutoff wall and the cover layer from being concentrated at the sealing joint between the connecting plate and the cutoff wall. Instead, it is shared by multiple sealing joints between the connecting plates, reducing the shear deformation of a single sealing joint.

[0003] To ensure that the joint sealing adaptability meets design requirements, current approaches to improve this problem include using hard contact measures such as corbels, support walls, and arc joints. However, the cost is high stress in the seepage prevention system at the hard contact points, which significantly increases the risk of cracking and damage to the concrete structure. For example, patent document CN118187129A discloses a panel dam foundation seepage prevention wall-connecting plate structure that adapts to large stress deformation. It limits the deformation of the overall structure by setting two seepage prevention walls, support corbels, inclined joints, and arc-straight joints. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is: how to coordinate the large deformation and high stress of the existing anti-seepage wall-toe plate connection structure.

[0005] The technical solution adopted by this invention to solve its technical problem is: A cutoff wall-toe plate interlocking connection structure includes a foundation, a cutoff wall on the foundation, a panel on one side of the cutoff wall, and a connection structure between the cutoff wall and the panel. The connection structure includes a mortar cushion layer on the upper end of the foundation, and a limiting plate, a connecting plate, and a toe plate sequentially arranged from the cutoff wall to the panel on the upper end of the mortar cushion layer. Multiple limiting plates are connected sequentially. Each limiting plate has a first end and a second end. In two adjacent limiting plates, the one closer to the cutoff wall... The second end of the limiting plate on one side of the seepage-proof wall is engaged with the first end of another limiting plate; the first end is protruding, and the second end is a groove matching the first end. The side of the seepage-proof wall near the limiting plate is provided with a slot of the same size as the groove of the second end, and the first end of the limiting plate closest to the seepage-proof wall engages with the slot; the end of the connecting plate near the limiting plate is provided with an abutment, and the second end of the limiting plate furthest from the seepage-proof wall engages with the abutment.

[0006] Furthermore, the side wall of the first end, the vertical groove wall of the second end groove, the vertical groove wall of the slot, and the side wall of the abutment portion are all inclined surfaces facing the direction of the toe plate.

[0007] Furthermore, it also includes multiple support pads. The support pad closest to the seepage-proof wall is disposed between the upper end of the slot and the lower end of the corresponding first end. The support pad closest to the toe plate is disposed between the lower end of the abutment portion and the upper end of the corresponding second end. The remaining multiple support pads are respectively disposed at the lower end of the first end and the upper end of the corresponding second end.

[0008] Furthermore, the aforementioned support pad is an elastic support block.

[0009] Furthermore, it also includes a joint sealing structure, which is installed in the connection gaps between each pair of components in the above-mentioned seepage-proof wall, multiple of the above-mentioned limiting plates, the above-mentioned connecting plates, the above-mentioned toe plates, and the above-mentioned panel.

[0010] Furthermore, the aforementioned anti-seepage wall is a corbel-type wall.

[0011] Furthermore, the aforementioned impermeable wall includes a slotted section and a cast-in-place section connected sequentially from bottom to top, wherein the cast-in-place section is cast in shape according to the shape and size of the aforementioned first end.

[0012] This invention also proposes a construction method for a seepage-proof wall-toe plate interlocking connection structure, characterized by the following steps: S1: Excavate the foundation and pour the impermeable wall; S2: Excavate the foundation surface between the seepage-proof wall and the panel to the preset elevation; S3: Backfill a mortar cushion layer of predetermined thickness at the top of the excavated foundation layer; S4: Based on the shape of the limiting plate, remove the mortar pad layer at the corresponding part of the limiting plate; S5: Multiple limiting plates, connecting plates and toe plates are poured sequentially from the anti-seepage wall to the panel on the upper end of the mortar cushion layer. During the pouring process, the multiple limiting plates, connecting plates and toe plates are poured independently one by one and the joint positions are separated by the joint water-stop structure.

[0013] Furthermore, in step S1, the anti-seepage wall is cast in the shape of a corbel. After the casting is completed, the poor quality part at the top of the anti-seepage wall is removed, and a cast-in-place section is cast, with a joint water-stop structure installed.

[0014] Furthermore, bolt-anchored support pads are installed at the connection points of the ends of the multiple limiting plates.

[0015] The beneficial effects of this invention are: The first and second ends of the adjacent limiting plates engage, the slot engages with the first end, and the abutment part engages with the second end. This end-to-end interlocking structure allows for more coordinated settlement and deformation of the toe plate and connecting plate, reducing concentrated deformation at the top of the anti-seepage wall and the first connecting plate connected to it. At the same time, it prevents high stress in the surrounding anti-seepage system, solving the deformation coordination problem of the connection structure between the anti-seepage wall and the toe plate. It effectively reduces the deformation value of the joint between the anti-seepage wall and the first connecting plate, while avoiding high stress in the surrounding anti-seepage system caused by the limiting measures, thus reducing the risk of cracking and damage to the anti-seepage system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the connection relationship of the limiting plate of the present invention; Figure 3 This is a schematic diagram of the limiting plate structure of the present invention; Figure 4 This is a schematic diagram of the seepage-proof wall structure of the present invention; Figure 5 This is a schematic diagram of the structural deformation of the present invention; The markings in the diagram are as follows: 1-foundation, 2-proof wall, 3-limiting plate, 4-connecting plate, 5-toe plate, 6-panel, 7-first end, 8-second end, 9-slot, 10-abutment part, 11-joint water-stopping structure, 12-support pad, 13-slotted section, 14-cast-in-place section. Detailed Implementation

[0017] The invention will be further described below with reference to the accompanying drawings.

[0018] The overburden dam foundation is mainly composed of fine particles, and is thick with poor physical and mechanical properties and poor resistance to deformation, resulting in significant settlement and deformation problems. Stress-deformation calculations and analysis of the dam revealed large deformations at the joints between toe plate 5, connecting plate 4, and the anti-seepage wall. The main factors affecting joint deformation include uneven deformation near the overburden dam foundation, the rockfill dam body, toe plate 5, and connecting plate 4.

[0019] like Figures 1-5 As shown in the embodiment of this application, a seepage-proof wall-toe plate interlocking connection structure is proposed, including a foundation 1, on which a seepage-proof wall 2 and a panel 6 are provided, and a connection structure is provided between the seepage-proof wall 2 and the panel 6; the connection structure includes a mortar cushion layer provided on the upper end of the foundation 1, and a limiting plate 3, a connecting plate 4, and a toe plate 5 are sequentially provided on the upper end of the mortar cushion layer from the seepage-proof wall 2 to the panel 6; the number of limiting plates 3 is multiple, and the multiple limiting plates 3 are connected in sequence; the limiting plate 3 has a first end 7 and a second end 8, and in two adjacent limiting plates 3, the one closer to the seepage-proof wall is... The second end 8 of the limiting plate 3 on one side of the above-mentioned limit plate 2 is engaged with the first end 7 of the other limiting plate 3; the first end 7 is protruding, and the second end 8 is a groove matching the first end 7. The side of the seepage-proof wall 2 near the limiting plate 3 is provided with a groove 9 of the same size as the groove of the second end 8, and the first end 7 of the limiting plate 3 closest to the seepage-proof wall 2 is engaged with the groove 9; the end of the connecting plate 4 near the limiting plate 3 is provided with an abutment part 10, and the second end 8 of the limiting plate 3 furthest from the seepage-proof wall 2 is engaged with the abutment part 10.

[0020] When actual dam foundation settlement deformation occurs, the overall interlocking connection structure composed of the interlocking structure of the first end 7 and the second end 8, the interlocking structure of the first end 7 and the slot 9, and the interlocking structure of the second end 8 and the abutment part 10 has a sufficiently large deformation coordination space. The limiting plate 3 not only undergoes vertical settlement deformation mode, but also exhibits partial rotation deformation mode, thereby avoiding direct hard contact and high stress.

[0021] First, it should be stated that the first end 7 and the second end 8 of the adjacent limiting plate 3 cooperate, the slot 9 cooperates with the first end 7, and the abutment part 10 cooperates with the second end 8. Through this end-to-end interlocking connection structure, the settlement deformation of the toe plate 5 and the connecting plate 4 can be more coordinated, that is, the concentrated deformation of the top of the seepage barrier wall 2 and the first connecting plate 4 connected to it is reduced, while the surrounding seepage barrier system will not generate high stress. This solves the deformation coordination problem of the connection structure between the seepage barrier wall and the toe plate 5, effectively reduces the deformation value of the joint between the seepage barrier wall and the first connecting plate 4, and avoids the problem of high stress in the surrounding seepage barrier system caused by the limiting measures, thereby reducing the risk of cracking and damage to the seepage barrier system.

[0022] It also includes a joint water-stop structure 11, which is set in the connection gap between each pair of components of the above-mentioned seepage-proof wall 2, multiple of the above-mentioned limiting plates 3, the above-mentioned connecting plates 4, the above-mentioned toe plates 5 and the above-mentioned panel 6. The joint water-stop structure 11 is set through the side of the first end 7 and the side of the second end 8 to avoid direct rigid contact and improve the water-stopping performance.

[0023] The side wall of the first end 7, the vertical groove wall of the groove of the second end 8, the vertical groove wall of the slot 9, and the side wall of the abutment part 10 are all inclined surfaces facing the toe plate 5. The side walls of the first end 7 and the second end 8 are stably engaged. Compared with the vertical engagement structure, this inclined engagement structure can decompose the vertical deformation of the joint into the horizontal direction, reducing the vertical uneven settlement value.

[0024] Furthermore, it includes multiple support pads 12. The support pad 12 closest to the seepage-proof wall 2 is located between the upper end of the slot 9 and the lower end of the corresponding first end 7. The support pad 12 closest to the toe plate 5 is located between the lower end of the abutment portion 10 and the upper end of the corresponding second end 8. The remaining support pads 12 are respectively located at the lower end of the cooperating first end 7 and the upper end of the second end 8. The material and thickness of the support pads 12 can be adjusted to pre-control deformation and avoid hard contact between rigid structures, thereby coordinating large deformations and high stresses between the seepage-proof wall and the toe plate 5. The support pads 12 can be elastic support blocks, such as rubber support blocks, which provide good buffering effect through elastic support when coordinating large deformations and high stresses.

[0025] The aforementioned anti-seepage wall 2 is a corbel-type wall, which has a better overall structural support effect. Moreover, the aforementioned anti-seepage wall 2 includes a grooved hole section 13 and a cast-in-place section 14 connected sequentially from bottom to top. The cast-in-place section 14 is cast according to the shape and size of the first end 7. Specifically, the entire anti-seepage wall 2 is first cast to form the grooved hole section 13; then the damaged or weak parts at the upper end of the anti-seepage wall 2 are removed; and then the cast-in-place section 14 is formed according to the shape of the first end 7 closest to the limiting plate 3 of the anti-seepage wall 2. The groove 9 formed by the cast-in-place section 14 can stably connect with the first end 7, ensuring the overall integrity of deformation coordination after large settlement deformation.

[0026] This application also proposes a construction method for a seepage-proof wall-toe plate interlocking connection structure, including the following steps. S1: Excavate foundation 1 and pour anti-seepage wall 2; form a corbel-shaped anti-seepage wall 2 by excavating holes and pouring. The anti-seepage wall 2 is perpendicular to foundation 1 as a whole, forming a stable support structure.

[0027] S2: Remove the surface layer of the foundation 1 between the seepage-proof wall 2 and the panel 6 to a predetermined thickness; specifically, remove the surface layer of the foundation 1 covering the seepage-proof wall 2, the toe plate 5, and the area approximately 2m downstream of the toe plate 5. The removal thickness depends on the thickness of the covering layer and the type of corbel. In this example, the covering layer is removed to the bottom of the designed corbel to form a stable trench section 13.

[0028] Then, the poor-quality part of the top of the anti-seepage wall is chiseled away to the surface elevation after the overburden is removed, and the cast-in-place section 14 of the corbel anti-seepage wall is constructed, and the joint stopper is buried. In order to ensure the compressive strength of the corbel area and reduce stress concentration, the corbel in this example adopts a trapezoidal shape. In order to reduce the deformation of the joint stopper after water storage, the downstream face of the top of the cast-in-place section 14 of the anti-seepage wall in this example adopts an inclined design, which can decompose the vertical deformation of the joint into the horizontal direction and reduce the vertical uneven settlement value.

[0029] S3: Backfill a mortar cushion layer of a predetermined thickness on the top of the excavated foundation 1 as a flexible support layer below.

[0030] S4: According to the shape of the limiting plate 3, remove the pre-set amount of mortar pad layer on the surface of the mortar pad layer corresponding to the location where the limiting plate 3 is set, to ensure that there is no gap between the mortar pad layer and the connection between the limiting plate 3, the connecting plate 4 and the toe plate 5, so as to form a stable support structure.

[0031] S5: Multiple limiting plates 3, connecting plates 4, and toe plates 5 are sequentially poured from the anti-seepage wall 2 to the panel 6 on the upper end of the mortar cushion layer, and joint water-stop structures 11 are set in the connection gaps between each component; specifically, the joint water-stop structure 11 is set in the side wall of the slot 9, the support pad 12 is set in the upper wall of the slot 9, and the first limiting plate 3 is poured into shape, so that the lower end of the first end 7 of the first limiting plate 3 abuts against the support pad 12, and the side wall of the first end 7 contacts the joint water-stop structure 11 to form a stable interlocking structure. Then, the subsequent limiting plates 3, connecting plates 4, and toe plates 5 are constructed in sequence, and the joint water-stop structure 11 is set in the side wall connection part of each plate.

[0032] In summary, this invention proposes a cutoff wall-toe plate interlocking connection structure and construction method. Through the interlocking connection structure of the corbel-type cutoff wall, the limiting plate 3, and the supporting pad 12, the deformation coordination problem of the connection structure between the cutoff wall and the toe plate 5 is solved, effectively reducing the deformation value of the joint between the cutoff wall and the first connecting plate 4. At the same time, it avoids the problem of high stress in the surrounding cutoff system caused by the limiting measures, and reduces the risk of cracking and damage to the cutoff system.

Claims

1. A seepage-proof wall-toe plate interlocking connection structure, comprising a foundation (1), wherein a seepage-proof wall (2) is provided on the foundation (1), a panel (6) is provided on one side of the seepage-proof wall (2), and a connection structure is provided between the seepage-proof wall (2) and the panel (6); the connection structure comprises a mortar cushion layer provided on the upper end of the foundation (1), wherein a limiting plate (3), a connecting plate (4) and a toe plate (5) are sequentially provided on the upper end of the mortar cushion layer from the seepage-proof wall (2) to the panel (6); the number of limiting plates (3) is multiple, and the multiple limiting plates (3) are connected sequentially; characterized in that, The limiting plate (3) is provided with a first end (7) and a second end (8). Among two adjacent limiting plates (3), the second end (8) of the limiting plate (3) closer to the seepage-proof wall (2) is engaged with the first end (7) of the other limiting plate (3). The first end (7) is protruding, and the second end (8) is a groove matching the first end (7). The seepage-proof wall (2) is provided with a slot (9) of the same size as the groove of the second end (8) on the side closer to the limiting plate (3), and the first end (7) of the limiting plate (3) closest to the seepage-proof wall (2) is engaged with the slot (9). The connecting plate (4) is provided with an abutment part (10) at the end closer to the limiting plate (3), and the second end (8) of the limiting plate (3) furthest from the seepage-proof wall (2) is engaged with the abutment part (10).

2. The seepage-proof wall-toe plate interlocking connection structure according to claim 1, characterized in that, The side wall of the first end (7), the vertical groove wall of the groove of the second end (8), the vertical groove wall of the slot (9) and the side wall of the abutment part (10) are all inclined surfaces facing the direction of the toe plate (5).

3. The seepage-proof wall-toe plate interlocking connection structure according to claim 1, characterized in that, It also includes multiple support pads (12), with the support pad (12) closest to the seepage-proof wall (2) located between the upper end of the slot (9) and the lower end of the corresponding first end (7), the support pad (12) closest to the toe plate (5) located between the lower end of the abutment part (10) and the upper end of the corresponding second end (8), and the remaining multiple support pads (12) respectively located at the lower end of the cooperating first end (7) and the upper end of the second end (8).

4. The seepage-proof wall-toe plate interlocking connection structure according to claim 3, characterized in that, The support pad (12) is an elastic support block.

5. A seepage-proof wall-toe plate interlocking connection structure according to any one of claims 1-4, characterized in that, It also includes a joint water-stop structure (11), which is set in the connection gap between each pair of components of the seepage-proof wall (2), multiple limiting plates (3), the connecting plate (4), the toe plate (5) and the panel (6).

6. The seepage-proof wall-toe plate interlocking connection structure according to claim 1, characterized in that, The seepage-proof wall (2) is a corbel-type wall.

7. The seepage-proof wall-toe plate interlocking connection structure according to claim 6, characterized in that, The seepage-proof wall (2) includes a slotted hole section (13) and a cast-in-place section (14) connected sequentially from bottom to top. The cast-in-place section (14) is cast according to the shape and size of the first end (7).

8. A construction method for a seepage-proof wall-toe plate interlocking connection structure, used for constructing the seepage-proof wall-toe plate interlocking connection structure as described in claim 5, characterized in that, Includes the following steps, S1: Excavate the foundation (1) and pour the anti-seepage wall (2); S2: Excavate the surface layer of the foundation (1) between the seepage-proof wall (2) and the panel (6) to the preset elevation; S3: Backfill a mortar cushion layer of a predetermined thickness on the top of the excavated foundation (1); S4: According to the shape of the limiting plate (3), remove the mortar pad layer at the corresponding part of the limiting plate (3); S5: Multiple limiting plates (3), connecting plates (4) and toe plates (5) are poured sequentially from the anti-seepage wall (2) to the panel (6) on the upper end of the mortar cushion layer. During the pouring process, multiple limiting plates (3), connecting plates (4) and toe plates (5) are poured independently one by one and the joint positions are separated by setting joint water-stop structures (11) one by one.

9. The construction method of the seepage-proof wall-toe plate interlocking connection structure according to claim 8, characterized in that, In step S1, the anti-seepage wall (2) is cast in the shape of a corbel. After the casting is completed, the poor quality part at the top of the anti-seepage wall is removed, and the cast-in-place section (14) is cast, and a joint water-stop structure (11) is set.

10. The construction method of the seepage-proof wall-toe plate interlocking connection structure according to claim 8, characterized in that, In step S5, bolt-anchored support pads (12) are installed at the connection points of the ends of the multiple limiting plates (3).

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