Concrete anti-seepage wall heightened anti-seepage structure and construction method thereof

Abstract

The invention discloses a concrete anti-seepage wall heightened anti-seepage structure and a construction method thereof in the technical field of water conservancy and hydropower engineering, and the heightened anti-seepage structure comprises a heightened anti-seepage wall poured at the top of an original anti-seepage wall and a plurality of reinforcing connecting frames arranged at intervals in the length direction of the original anti-seepage wall; the reinforcing connecting frame comprises a transverse reinforcing plate and vertical joint bars arranged at the bottom of the transverse reinforcing plate, the vertical joint bars are inserted into joint bar holes in the top of the original diaphragm wall, and the whole reinforcing connecting frame and the heightened diaphragm wall are poured together. By arranging the reinforcing connecting frame, the heightened anti-seepage wall obtained after concrete pouring and the original anti-seepage wall form a stable connecting structure through the reinforcing connecting frame, the lower end of the heightened anti-seepage wall is connected with the original anti-seepage wall through the n-shaped wrapping section, the contact area of the connecting part is further increased, and the connecting strength of the connecting part is further improved; and meanwhile, the water seepage condition caused by cracks between the heightened anti-seepage wall and the original anti-seepage wall can be avoided.

Description

Technical Field

[0001] This invention relates to the field of water conservancy and hydropower engineering technology, and in particular to a concrete anti-seepage wall heightening anti-seepage structure and its construction method. Background Technology

[0002] Cutoff walls are continuous underground walls formed by drilling round holes or excavating trenches using specialized equipment, pouring concrete into the holes, backfilling with clay or other seepage-proof materials, or installing precast concrete structures. In water conservancy and hydropower projects, cutoff walls are commonly used as the main seepage-proof structure of cofferdams. However, after the flood season, damage to the cofferdam body necessitates repair of the cutoff wall defects. Currently, the main method for addressing cutoff wall quality defects is to directly raise the top of the existing cutoff wall. For example, patent document CN107237339A discloses a concrete cutoff wall heightening structure and its construction method. This method primarily improves the connection strength between the heightened cutoff wall and the original cutoff wall by drilling holes on both sides and injecting grout. However, this heightening method lacks a direct reinforcing connection structure between the heightened and original cutoff walls, resulting in poor stability. In turbulent water flows, the heightened cutoff wall is easily washed away, further damaging the original cutoff wall structure. Summary of the Invention

[0003] To overcome the shortcomings of existing methods for raising anti-seepage walls, such as low connection strength with the original anti-seepage wall, the technical problem to be solved by this invention is to provide a concrete anti-seepage wall raising structure and its construction method that can improve the connection strength between the raised anti-seepage wall and the original anti-seepage wall.

[0004] The technical solution adopted by this invention to solve its technical problem is: The concrete cutoff wall heightening and seepage prevention structure includes the original cutoff wall and the heightened cutoff wall poured on top of the original cutoff wall. It also includes multiple reinforcing connecting frames spaced apart along the length of the original cutoff wall. Each reinforcing connecting frame includes a horizontal reinforcing plate and vertical reinforcing bars set at the bottom of the horizontal reinforcing plate. The top of the original cutoff wall is provided with reinforcing bar holes and grouting holes. The vertical reinforcing bars of the reinforcing connecting frame are inserted into the reinforcing bar holes. The entire reinforcing connecting frame is poured together with the heightened cutoff wall. The horizontal reinforcing plate is located in the middle of the heightened cutoff wall. The lower end of the heightened cutoff wall is covered on top of the original cutoff wall by an n-shaped wrapping section.

[0005] Furthermore, the middle part of the horizontal reinforcing plate has a hollow structure, the vertical inserts are arranged around the bottom of the horizontal reinforcing plate, and horizontal connecting ribs are arranged between adjacent vertical inserts.

[0006] Furthermore, the width of the transverse reinforcing plate is approximately the same as the width of the heightened anti-seepage wall, and grooves are provided on the periphery of both the upper and lower surfaces of the transverse reinforcing plate.

[0007] Furthermore, the grouting holes are located in the middle area of ​​the top of the original seepage barrier wall, and the reinforcing bar holes are located on both sides of the grouting holes.

[0008] Furthermore, the height of the n-shaped wrapping section at the lower end of the heightened anti-seepage wall is not less than 70% of the height of the portion of the heightened anti-seepage wall located above the original anti-seepage wall.

[0009] Furthermore, the thickness of the n-shaped wrapping section of the heightened anti-seepage wall is not less than 30% of the thickness of the original anti-seepage wall, and the thickness of the portion of the heightened anti-seepage wall located above the original anti-seepage wall is the same as the thickness of the original anti-seepage wall.

[0010] Furthermore, the original earth-rock cofferdam is provided on both sides of the original seepage barrier wall, and the original riprap slope is provided on the outside of the original earth-rock cofferdam. The raised seepage barrier wall is provided on both sides with raised earth-rock cofferdams that are compatible with the original earth-rock cofferdams, and the raised riprap slope is provided on the outside of the raised earth-rock cofferdams that are compatible with the original riprap slope.

[0011] The construction method for the above-mentioned concrete anti-seepage wall heightening anti-seepage structure includes the following steps: S1: Use a geological drilling machine to open grouting holes and bar insertion holes on the top of the original seepage barrier, and excavate widening joints on both sides of the top of the original seepage barrier. S2: Based on the shape and design elevation of the heightened anti-seepage wall, insert edge retaining templates into the inner wall of the widening joint to form a casting cavity, and install a reinforcing connecting frame inside the casting cavity; S3: The original earth-rock cofferdam is filled with rubble to raise the earth-rock cofferdam to the design elevation, and then a raised riprap slope is built on the outside of the raised earth-rock cofferdam. S4: Grout concrete into the pouring cavity through the top opening of the edge retaining formwork until the design elevation is reached, and then allow it to cure statically to form a heightened anti-seepage wall.

[0012] Furthermore, in step S1, at least two rows of grouting holes and two rows of reinforcing bar holes are set along the width direction of the original anti-seepage wall, respectively located on both sides of the grouting holes. The depth of the reinforcing bar holes is not less than 0.5m, and the depth of the grouting holes is not less than 1m. In step S2, after the edge retaining formwork is installed, a waterproof membrane is laid at the bottom of the widening joint, and then concrete grouting is carried out.

[0013] Furthermore, in step S4, grouting auxiliary equipment is first erected on the top of the raised riprap slope, and then grouting is performed through the grouting auxiliary equipment. The grouting auxiliary equipment includes a support frame, a winch, and a pouring pipe. The winch is set on the top of the support frame, and two fixed pulleys are provided below the top of the support frame. The two ends of the connecting frame at the top of the pouring pipe are respectively provided with movable pulleys and fixed blocks. The steel rope of the winch passes through the movable pulleys and the two fixed pulleys in sequence and is fixedly connected to the fixed blocks.

[0014] The beneficial effects of this invention are as follows: by setting grouting holes and reinforcing bar holes at the top of the original seepage barrier, and inserting reinforcing connecting frames into the reinforcing bar holes, the heightened seepage barrier obtained after pouring concrete forms a stable connection structure with the original seepage barrier through the reinforcing connecting frames and the concrete columns in the grouting holes. Furthermore, the lower end of the heightened seepage barrier is connected to the original seepage barrier through an n-shaped wrapping section, which further increases the contact area and connection strength of the connection part, and at the same time avoids water seepage caused by cracks between the heightened seepage barrier and the original seepage barrier. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the heightened seepage-proof wall after the present invention has been formed; Figure 2 This is a schematic diagram of the construction process of raising the anti-seepage wall according to the present invention; Figure 3 This is a top view of the reinforcing connecting frame of the present invention; Figure 4 This is a bottom view of the reinforcing connecting frame of the present invention.

[0016] The markings in the diagram are as follows: 1-Original seepage barrier wall, 2-Heightened seepage barrier wall, 3-Reinforced connecting frame, 4-Original earth-rock cofferdam, 5-Original riprap slope protection, 6-Heightened earth-rock cofferdam, 7-Heightened riprap slope protection, 8-Edge retaining formwork, 9-Grouting auxiliary equipment, 11-Rebar insertion hole, 12-Grouting hole, 21-N-shaped wrapping section, 31-Horizontal reinforcing plate, 32-Vertical rebar insertion, 33-Horizontal connecting rebar, 34-Groove, 41-Wide joint, 91-Support frame, 92-Wind machine, 93-Irrigation pipe, 94-Fixed pulley, 95-Connecting frame, 96-Moving pulley, 97-Fixed block. Detailed Implementation

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

[0018] It should be noted that if this invention uses directional terms such as up, down, left, right, front, and back, these are for describing the relative positions of components and are not specific references to the absolute positions of related components or the relationships between them. They are only used to explain the relative positional relationships and movements of components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. If this invention uses terms related to quantity such as "many," "multiple," or "several," these specifically refer to two or more.

[0019] like Figure 1 , Figure 2As shown, the present invention provides a reinforced concrete anti-seepage wall structure, comprising an original anti-seepage wall 1 and an reinforced anti-seepage wall 2 cast on top of the original anti-seepage wall 1. It also includes multiple reinforcing connecting frames 3 spaced apart along the length of the original anti-seepage wall 1. Each reinforcing connecting frame 3 includes a horizontal reinforcing plate 31 and vertical reinforcing bars 32 located at the bottom of the horizontal reinforcing plate 31. The top of the original anti-seepage wall 1 has reinforcing bar holes 11 and grouting holes 12. The vertical reinforcing bars 32 of the reinforcing connecting frame 3 are inserted into the reinforcing bar holes 11. The entire reinforcing connecting frame 3 is cast together with the reinforced anti-seepage wall 2. The horizontal reinforcing plate 31 is located in the middle of the reinforced anti-seepage wall 2. The lower end of the reinforced anti-seepage wall 2 is covered on top of the original anti-seepage wall 1 by an n-shaped wrapping section 21. The spacing between adjacent reinforcing connecting frames 3 is designed according to the length and thickness of the original anti-seepage wall 1, specifically one frame every 3-5 meters.

[0020] The heightened anti-seepage wall 2 of this invention has three reinforced connection points with the original anti-seepage wall 1. The first connection is through a reinforcing connecting frame 3, the upper half of which is cast together with the heightened anti-seepage wall 2, and the lower half is inserted into the reinforcing bar hole 11, and is fixedly connected to the original anti-seepage wall 1 by the grouting concrete entering the hole; the second connection is through a concrete column formed by the concrete flowing into the grouting hole 12 when the heightened anti-seepage wall 2 is cast, which is connected to the original anti-seepage wall 1; the third connection is through the n-shaped wrapping section 21 at the lower end of the heightened anti-seepage wall 2 forming a wrapping connection with the top of the original anti-seepage wall 1. The reinforcing connecting frame 3 mainly serves as an internal skeleton to improve the structural strength of the connection parts and the heightened anti-seepage wall 2. The concrete column in the grouting hole 12 is mainly used to increase the internal interface area between the heightened anti-seepage wall 2 and the original anti-seepage wall 1. The n-shaped wrapping section 21 is used to increase the external interface area between the heightened anti-seepage wall 2 and the original anti-seepage wall 1. The combination of the two can improve the tightness of the concrete connection between the heightened anti-seepage wall 2 and the original anti-seepage wall 1 at the connection parts, and avoid water seepage problems caused by cracks formed between the old and new concrete.

[0021] For the reinforcing connecting frame 3, the present invention also provides the following preferred solutions. To prevent the transverse reinforcing plate 31 from obstructing concrete pouring, the middle portion of the transverse reinforcing plate 31 can be configured as a hollow structure, such as... Figure 3 , Figure 4As shown, the vertical reinforcing bars 32 are arranged around the bottom perimeter of the horizontal reinforcing plate 31. Furthermore, depending on the height of the raised seepage barrier wall 2, the length of the vertical reinforcing bars 32 may be relatively long. To ensure the stability of the vertical reinforcing bars 32, horizontal connecting bars 33 can be connected between adjacent vertical reinforcing bars 32. The width of the horizontal reinforcing plate 31 can be set to be approximately equal to the width of the raised seepage barrier wall 2, and grooves 34 are provided on the perimeter of both the upper and lower surfaces of the horizontal reinforcing plate 31 to increase the contact area between the raised seepage barrier wall 2 and the horizontal reinforcing plate 31, thereby ensuring the tightness of the connection between the raised seepage barrier wall 2 and the entire reinforcing connecting frame 3, and ensuring that the reinforcing connecting frame 3 can provide sufficient reinforcement. Based on the structural characteristics of the horizontal reinforcing plate 31, because the vertical reinforcing bars 32 are located around the perimeter, the grouting holes 12 are located in the middle of the original seepage barrier wall 1, and the reinforcing bar holes 11 are located on both sides of the grouting holes 12.

[0022] To further increase the contact area between the heightened cutoff wall 2 and the original cutoff wall 1 and ensure the reliability of their connection, the height of the n-shaped wrapping section 21 at the lower end of the heightened cutoff wall 2 is not less than 70% of the height of the portion of the heightened cutoff wall 2 above the original cutoff wall 1, the thickness of the n-shaped wrapping section 21 of the heightened cutoff wall 2 is not less than 30% of the thickness of the original cutoff wall 1, and the thickness of the portion of the heightened cutoff wall 2 above the original cutoff wall 1 is the same as the thickness of the original cutoff wall 1.

[0023] To ensure the structural stability of the entire anti-seepage wall, original earth-rock cofferdams 4 are provided on both sides of the original anti-seepage wall 1, and original riprap slope protection 5 is provided on the outside of the original earth-rock cofferdams 4. On both sides of the heightened anti-seepage wall 2, heightened earth-rock cofferdams 6 are provided to match the original earth-rock cofferdams 4, and heightened riprap slope protection 7 is provided on the outside of the heightened earth-rock cofferdams 6 to match the original riprap slope protection 5.

[0024] In addition, the present invention also provides a construction method for raising the above-mentioned concrete anti-seepage wall anti-seepage structure, which mainly includes the following steps: S1: Use a geological drilling machine to open grouting holes 12 and bar insertion holes 11 on the top of the original seepage barrier wall 1, and excavate widening joints 41 on both sides of the top of the original seepage barrier wall 1. S2: Based on the shape and design elevation of the heightened anti-seepage wall 2, insert the edge retaining template 8 into the inner wall of the widening joint 41 to form a casting cavity, and install the reinforcing connecting frame 3 in the casting cavity; S3: The top of the original earth-rock cofferdam 4 is filled with rubble to raise the earth-rock cofferdam 6 to the design elevation. Then, a raised riprap slope protection 7 is built on the outside of the raised earth-rock cofferdam 6. S4: Pour concrete into the casting cavity through the top opening of the edge retaining formwork 8 until the design elevation is reached, and then allow it to cure statically to form the heightened anti-seepage wall 2.

[0025] In step S1, based on the thickness of the original seepage barrier 1, at least two rows of grouting holes 12 and two rows of reinforcing bar holes 11 are set along the width direction of the original seepage barrier 1, respectively located on both sides of the grouting holes 12. The depth of the reinforcing bar holes 11 is not less than 0.5m, and the depth of the grouting holes 12 is not less than 1m, to ensure the reliability of the connection between the reinforcing connecting frame 3 and the newly poured raised seepage barrier 2 and the original seepage barrier 1. In step S2, after the edge retaining template 8 is installed, a waterproof membrane can be laid at the bottom of the widening joint 41 before the concrete of the raised seepage barrier 2 is poured. This can prevent seepage water from entering the n-shaped wrapping section 21 and the original seepage barrier 1 through the gap between the bottom of the raised seepage barrier 2 and the original earth-rock cofferdam 4, ensuring the sealing of the connection between the raised seepage barrier 2 and the original seepage barrier 1.

[0026] In step S4, to facilitate the pouring of the heightened seepage barrier 2, such as... Figure 2 As shown, a grouting auxiliary device 9 can be first erected on the top of the raised riprap slope 7, and then grouting operations can be performed through the grouting auxiliary device 9. The grouting auxiliary device 9 includes a support frame 91, a winch 92, and a pouring pipe 93. The winch 92 is set on top of the support frame 91, and two fixed pulleys 94 are provided below the top of the support frame 91. The two ends of the connecting frame 95 at the top of the pouring pipe 93 are respectively provided with movable pulleys 96 and fixed blocks 97. The steel rope of the winch 92 passes through the movable pulleys 96 and the two fixed pulleys 94 in sequence and is then fixedly connected to the fixed block 97. During pouring, the pouring pipe 93 is first lowered into the pouring cavity formed by the edge retaining template 8 through the winch 92, and the bottom n-shaped wrapping section 21 is poured. During the pouring process, the pouring pipe 93 is slowly lifted until the grouting reaches the design elevation. Multiple grouting auxiliary devices 9 can be installed along the extension direction of the anti-seepage wall and work simultaneously. Alternatively, a slide rail can be installed along the extension direction of the anti-seepage wall to slide the grouting auxiliary devices 9 on the slide rail to achieve mobile grouting.

Claims

1. A reinforced concrete anti-seepage wall structure, comprising the original anti-seepage wall (1) and a reinforced anti-seepage wall (2) cast on top of the original anti-seepage wall (1), characterized in that: It also includes multiple reinforcing connecting frames (3) spaced apart along the length of the original seepage barrier (1). The reinforcing connecting frame (3) includes a horizontal reinforcing plate (31) and a vertical insert (32) set at the bottom of the horizontal reinforcing plate (31). The top of the original seepage barrier (1) is provided with insert holes (11) and grouting holes (12). The vertical insert (32) of the reinforcing connecting frame (3) is inserted into the insert holes (11). The entire reinforcing connecting frame (3) is cast together with the heightened seepage barrier (2). The horizontal reinforcing plate (31) is located in the middle of the heightened seepage barrier (2). The lower end of the heightened seepage barrier (2) is covered on the top of the original seepage barrier (1) by an n-shaped wrapping section (21).

2. The concrete seepage-proof wall heightening seepage-proof structure as described in claim 1, characterized in that: The middle part of the horizontal reinforcing plate (31) is hollow, and the vertical insert (32) is set around the bottom of the horizontal reinforcing plate (31). A horizontal connecting rib (33) is provided between adjacent vertical inserts (32).

3. The concrete anti-seepage wall heightening and anti-seepage structure as described in claim 2, characterized in that: The width of the transverse reinforcing plate (31) is equivalent to the width of the heightened anti-seepage wall (2), and the periphery of the upper and lower sides of the transverse reinforcing plate (31) is provided with grooves (34).

4. The concrete anti-seepage wall heightening and anti-seepage structure as described in claim 1, characterized in that: The grouting hole (12) is located in the middle area of ​​the top of the original seepage barrier wall (1), and the reinforcing bar hole (11) is located on both sides of the grouting hole (12).

5. The concrete anti-seepage wall heightening and anti-seepage structure as described in claim 1, characterized in that: The height of the n-shaped wrapping section (21) at the lower end of the heightened anti-seepage wall (2) is not less than 70% of the height of the portion of the heightened anti-seepage wall (2) located above the original anti-seepage wall (1).

6. The concrete anti-seepage wall heightening and anti-seepage structure as described in claim 5, characterized in that: The thickness of the n-shaped wrapping section (21) of the heightened anti-seepage wall (2) is not less than 30% of the thickness of the original anti-seepage wall (1), and the thickness of the part of the heightened anti-seepage wall (2) above the original anti-seepage wall (1) is the same as the thickness of the original anti-seepage wall (1).

7. The concrete anti-seepage wall heightening and anti-seepage structure as described in any one of claims 1-6, characterized in that: The original seepage barrier (1) is provided with original earth and rock cofferdams (4) on both sides, and original riprap slope protection (5) is provided on the outside of the original earth and rock cofferdam (4). The raised seepage barrier (2) is provided with raised earth and rock cofferdams (6) on both sides that are compatible with the original earth and rock cofferdam (4), and raised riprap slope protection (7) is provided on the outside of the raised earth and rock cofferdam (6) that is compatible with the original riprap slope protection (5).

8. A construction method for reinforcing a concrete anti-seepage wall with a heightened anti-seepage structure, characterized in that, The method of using the concrete anti-seepage wall heightening anti-seepage structure as described in claim 7 further includes the following steps: S1: Use a geological drilling machine to open grouting holes (12) and bar insertion holes (11) on the top of the original seepage barrier (1), and excavate widening joints (41) on both sides of the top of the original seepage barrier (1). S2: Based on the shape and design elevation of the heightened anti-seepage wall (2), insert the edge retaining template (8) into the inner wall of the widening joint (41) to form a casting cavity, and install the reinforcing connecting frame (3) in the casting cavity. S3: The original earth-rock cofferdam (4) was filled with rubble to raise the earth-rock cofferdam (6) to the design elevation. Then, a raised rubble slope protection (7) was built on the outside of the raised earth-rock cofferdam (6). S4: Pour concrete into the pouring cavity at the top opening of the edge retaining formwork (8) until the design elevation is reached, and then allow it to stand still for curing to form a heightened anti-seepage wall (2).

9. The construction method of the concrete anti-seepage wall heightening anti-seepage structure as described in claim 8, characterized in that: In step S1, at least two rows of grouting holes (12) and two rows of reinforcing bar holes (11) are set along the width direction of the original anti-seepage wall (1), and are located on both sides of the grouting holes (12). The depth of the reinforcing bar holes (11) is not less than 0.5m, and the depth of the grouting holes (12) is not less than 1m. In step S2, after the edge retaining formwork (8) is installed, a waterproof membrane is laid at the bottom of the widening joint (41), and then concrete is poured.

10. The construction method of the concrete anti-seepage wall heightening anti-seepage structure as described in claim 8, characterized in that: In step S4, a grouting auxiliary device (9) is first erected on the top of the raised riprap slope (7), and then grouting is performed through the grouting auxiliary device (9). The grouting auxiliary device (9) includes a support frame (91), a winch (92) and a pouring pipe (93). The winch (92) is set on the top of the support frame (91). Two fixed pulleys (94) are provided below the top of the support frame (91). The two ends of the connecting frame (95) at the top of the pouring pipe (93) are respectively provided with a movable pulley (96) and a fixed block (97). The steel rope of the winch (92) passes around the movable pulley (96) and the two fixed pulleys (94) in sequence and is fixedly connected to the fixed block (97).

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