Variable cross-section assembly type underground diaphragm wall

Abstract

The utility model discloses a variable cross-section assembly type underground diaphragm wall, and aims to overcome the defect that in the prior art, a prefabricated part is not designed or constructed in a targeted mode according to the stress characteristics of a diaphragm wall, so that the utilization rate of the cross section of the diaphragm wall component is low. The technical problem is solved through the following technical scheme that the prefabricated member with the standard section comprises a prefabricated member with the standard section, a crossover coupling and a prefabricated member with the non-standard section, and reserved steel bar holes are formed in the end faces of the two ends of the crossover coupling. Longitudinal load-bearing steel bars matched with the reserved steel bar holes are arranged on the standard-section prefabricated plate type component and the non-standard-section prefabricated plate type component. According to the stress distribution condition of the diaphragm wall, the section increasing design is adopted at the position where the section bending moment of the component is large, the section reducing design is adopted at the position where the section bending moment of the component is small, reliable connection of components with different sections is achieved through the adapter substitute, the section utilization rate of the prefabricated component is improved, and the design engineering cost of the diaphragm wall is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of underground anti-seepage walls, and more specifically, to a variable-section assembled underground anti-seepage wall. Background Art

[0002] Underground anti-seepage walls are widely used in the fields of anti-seepage and anti-floating of existing building basements, anti-seepage of dams, anti-seepage of landfills and protection of heritage sites. In loose strata with good permeability and high pressure head, there are higher anti-seepage requirements. In deep and large foundation pit projects, in order to meet the anti-floating requirements of the building basement during the construction stage or normal use stage, the design of anti-seepage walls is usually combined with the foundation pit retaining structure, drainage system, etc.

[0003] For deep-buried anti-seepage walls in water-rich strata, it is difficult to ensure the construction quality of the wall, such as verticality, thickness and strength. The wall is prone to cracking due to deformation. The cracked parts are eroded by groundwater for a long time, forming seepage channels, which accelerates the failure of the anti-seepage wall. Therefore, in addition to meeting the requirements of durability, airtightness and bearing performance, the design of the anti-seepage wall should also have a certain ability to resist deformation.

[0004] Existing technical solutions: underground anti-seepage walls can be divided into cast-in-place and prefabricated types according to their structure. The cast-in-place type mainly includes cement soil continuous walls and reinforced concrete underground continuous walls formed by channel cutting, mixing, rotary grouting, milling and other methods, such as TRD (channel cutting cement soil continuous wall), CSM (milling deep mixing cement soil continuous wall), high-pressure rotary grouting piles, cement mixing piles, etc.; the prefabricated type is achieved by embedding prefabricated assembled components in the cement soil continuous wall, such as the emerging domestic channel cutting prefabricated assembled concrete continuous wall (abbreviated as TAD method).

[0005] The cement soil continuous wall is a flexible anti-seepage wall with relatively low bearing capacity and strength, and poor deformation resistance. Therefore, it is only used as a water-stop curtain in foundation pit projects to prevent groundwater or soil from entering the foundation pit. When it is necessary to bear water and soil pressure, additional retaining piles can be added to the inside of the continuous wall or prefabricated panels can be inserted into the continuous wall. The retaining piles or prefabricated panels can resist deformation to form a composite structure that integrates force and water stopping. The former cannot achieve the purpose of deformation coordination in essence, and the construction quality is difficult to guarantee. The cement soil continuous wall and the retaining piles have poor fit. In actual projects, water leakage due to cracking of the cement soil continuous wall outside the retaining piles is endless; the latter and the cast-in-place underground continuous wall can bear force together and coordinate deformation, which greatly improves the anti-bending and anti-cracking capabilities of the anti-seepage wall.

[0006] Chinese Patent Announcement Number: CN215482877U, Announcement Date: January 11, 2022. The name of the application is "An underground prefabricated component and assembled wall". The application discloses an underground prefabricated component and assembled wall. In the above patent document, the upper and lower cross-sections are the same, and no targeted design or construction is carried out in combination with the stress characteristics of the anti-seepage wall, resulting in low cross-sectional utilization of the anti-seepage wall component and serious material waste. Utility Model Content

[0007] The utility model overcomes the deficiency in the prior art that the prefabricated components are not specifically designed or constructed in combination with the stress characteristics of the anti-seepage wall, resulting in a low cross-section utilization rate of the anti-seepage wall components, and provides a variable-section assembled underground anti-seepage wall, which can, according to the stress distribution of the anti-seepage wall, adopt an enlarged cross-section design at the location where the cross-section bending moment of the component is larger, and adopt a reduced cross-section design at the location where the cross-section bending moment is smaller, and realizes reliable connection of components with different cross-sections through conversion joints, thereby improving the cross-section utilization rate of the prefabricated components and reducing the design engineering cost of the anti-seepage wall; and conversion joints are arranged at different cross-sections, so that fast assembly of prefabricated components with different cross-sections can be realized, and the bending, shear and seepage resistance of the joints can be improved.

[0008] In order to solve the above technical problems, the utility model adopts the following technical solutions: a variable-section assembled underground anti-seepage wall, comprising: a standard-section prefabricated plate-type component, a conversion joint and a non-standard-section prefabricated plate-type component, the end faces of the conversion joints are provided with reserved steel bar holes, and the standard-section prefabricated plate-type components and the non-standard-section prefabricated plate-type components are both provided with longitudinal force-bearing steel bars that match the reserved steel bar holes.

[0009] In the utility model, prefabricated and assembled components are adopted, which are factory-produced and require no maintenance time, thereby ensuring the quality of the anti-seepage wall during construction. In addition, according to the force distribution of the anti-seepage wall, an enlarged cross-section design is adopted at the location where the bending moment of the component section is larger, and a reduced cross-section design is adopted at the location where the bending moment of the section is smaller, and reliable connection of components with different cross-sections is achieved through conversion joints, thereby improving the utilization rate of the cross-section of the prefabricated components and reducing the design engineering cost of the anti-seepage wall.

[0010] Preferably, the conversion joint includes a joint box, which includes an upper end plate and a lower end plate; the sides of the upper end plate and the lower end plate at both ends in the length direction are connected by side plates; the sides of the upper end plate and the lower end plate at both ends in the width direction are connected by stiffening plates.

[0011] The upper end plate, the lower end plate, the side plate and the stiffening plate are welded to form an integral structure, making the overall structure more solid.

[0012] Preferably, both the upper end plate and the lower end plate are provided with reserved openings.

[0013] The reserved opening can reduce material loss, which not only reduces the overall weight but also reduces the manufacturing cost.

[0014] Preferably, the upper end plate is provided with a plurality of upper reserved steel bar holes on both sides along its width direction, and upper longitudinal force-bearing steel bars cooperating with the plurality of upper reserved steel bar holes are provided on both sides in the width direction of the lower end face of the standard-section prefabricated plate-type component.

[0015] By cooperating with the upper reserved steel bar holes and the upper longitudinal force-bearing steel bars, the standard-section prefabricated plate-type components can be conveniently connected to the conversion structure.

[0016] Preferably, the upper end plate is provided with expansion water stop strips on both sides along the width direction thereof.

[0017] Through the deadweight of the standard-section prefabricated plate-type component, the expansion waterstop strip is squeezed and deformed to seal the gap between the standard-section prefabricated plate-type component and the conversion joint, thereby improving the anti-seepage effect.

[0018] Preferably, a groove is provided on one end face of the conversion joint in the length direction along its height direction, the width of the groove gradually narrows from top to bottom, and a tenon matching the groove is provided on one end face of the conversion joint in the length direction along its height direction.

[0019] The conversion joint adopts a variable-section streamlined concave-convex tenon design, with the groove larger at the top and smaller at the bottom. The adjacent wall panels can be embedded in the groove through the convex tenon to avoid displacement, extend the penetration path at the joint between adjacent wall panels, and improve the longitudinal anti-seepage effect of the wall.

[0020] Preferably, the lower end plate is provided with a plurality of lower reserved steel bar holes on both sides along its width direction, and the upper end surface of the non-standard section prefabricated plate-type component is provided with lower longitudinal force-bearing steel bars matching with the plurality of lower reserved steel bar holes on both sides in the width direction.

[0021] By cooperating with the lower reserved steel bar holes and the lower longitudinal force-bearing steel bars, non-standard section prefabricated plate-type components can be conveniently connected to the conversion structure.

[0022] Preferably, micro-expansive concrete is provided in the joint box.

[0023] Micro-expansive concrete should have rapid hardening properties and be used to fill the gap between the joint box and the stiffening plate to improve the shear and impermeability properties of the conversion joint.

[0024] Preferably, anchor plates are provided on both sides of the lower end plate in the width direction.

[0025] Since the structural connection between the conversion joint and the non-standard section prefabricated plate-type components should be completed in the factory, the anchor plate and the lower end plate of the joint box are connected by welding during the connection. When the non-standard section prefabricated plate-type components are produced in the factory, the anchor rods are embedded in the non-standard prefabricated plate-type components, and the lower longitudinal force-bearing steel bars of the non-standard prefabricated plate-type components are passed through the lower reserved steel bar holes. After the structural connection with the lower end plate of the joint box is completed by high-strength nuts, the concrete pouring of the non-standard section prefabricated plate-type components is carried out, thereby achieving reliable water stopping between the non-standard section prefabricated plate-type components and the conversion joint, and the coordination of force and deformation.

[0026] Compared with the prior art, the beneficial effects of the utility model are as follows: in the utility model, prefabricated and assembled components are adopted, which are factory-produced and require no maintenance time, thereby ensuring the quality of the anti-seepage wall during construction; in addition, the force distribution of the anti-seepage wall adopts an enlarged cross-section design where the bending moment of the component section is larger, and a reduced cross-section design is adopted where the bending moment of the section is smaller, and reliable connection of components with different cross-sections is achieved through conversion joints, thereby improving the cross-section utilization rate of prefabricated components and reducing the design engineering cost of the anti-seepage wall; and expansion water stop strips, welding, anchor plates and the like are used at the joints to improve the anti-seepage ability, realize the rapid assembly of prefabricated components with different cross-sections, and improve the bending, shear and seepage resistance of the joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0028] Figure 2 It is a structural schematic diagram of a standard cross-section prefabricated plate-type component of the utility model;

[0029] Figure 3 It is a structural schematic diagram of the conversion structure of the utility model;

[0030] Figure 4 It is a structural schematic diagram of a non-standard cross-section prefabricated plate-type component of the utility model;

[0031] Figure 5 It is a schematic structural diagram of the connection between the conversion structure of the utility model and the prefabricated plate-shaped components with non-standard cross-sections and prefabricated plate-shaped components with standard cross-sections;

[0032] Figure 6 It is a side view of the overall structure of the utility model;

[0033] Figure 7 It is a schematic diagram of the first step of the construction of the utility model;

[0034] Figure 8 It is a schematic diagram of the second step of the construction of the utility model;

[0035] Fig. 9It is a schematic diagram of the third step of the construction of the utility model;

[0036] Fig.10 It is a schematic diagram of the fourth step of the construction of the utility model;

[0037] Fig.11 It is a schematic diagram of the fifth step of the construction of the utility model;

[0038] In the figure: 1. Cement soil continuous wall;

[0039] 2. Standard section prefabricated plate-type components, 21. Upper longitudinal stress-bearing steel bars, 22. Embedded end plates;

[0040] 3. conversion joint, 31. joint box, 311. upper end plate, 312. lower end plate, 313. side plate, 314. stiffening plate, 315. upper cell cavity, 316. lower cell cavity, 32. reserved opening, 33. upper reserved steel bar hole, 34. lower reserved steel bar hole, 35. micro-expansion concrete, 36. expansion water stop strip, 37. groove, 38. tenon, 39. anchor plate;

[0041] 4. Prefabricated plate components with non-standard cross-sections, 41. Lower longitudinal stress-bearing reinforcement. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0043] Example 1: Reference Figures 1 to 11 As shown, a variable-section assembled underground anti-seepage wall mainly includes the following parts: a cement-soil continuous wall 1, a standard-section prefabricated plate-type component 2, a conversion joint 3 and a non-standard-section prefabricated plate-type component 4.

[0044] The cement soil continuous wall 1 is continuously set along the horizontal and depth directions of the foundation pit, and the wall width should be greater than the cross-sectional width of the standard section prefabricated plate-type component 2 by more than 150mm. The standard section prefabricated plate-type component 2 and the non-standard section prefabricated plate-type component 4 can be prefabricated sheet piles or prefabricated walls, which are standardized in the factory to ensure the quality of the wall and improve the bending and crack resistance of the anti-seepage wall; the thickness of the former is generally 400~1000mm, and the latter can adjust the wall thickness according to the design requirements, which is generally not less than 200mm.

[0045] The conversion joint 3 mainly includes a joint box 31, which is composed of an upper end plate 311 and a lower end plate 312. The sides of the upper end plate 311 and the lower end plate 312 at both ends in the length direction are connected by welding with the side plates 313; the sides of the upper end plate 311 and the lower end plate 312 at both ends in the width direction are connected by welding with the stiffening plate 314. At the same time, reserved openings 32 are provided on the upper end plate 311 and the lower end plate 312. In this embodiment, there are two reserved openings 32, and the two reserved openings 32 are arranged along the length direction thereof. In addition, reserved channels matching the reserved openings 32 are provided on the standard section prefabricated plate-type components 2 and the non-standard section prefabricated plate-type components 4.

[0046] The upper and lower end faces of the conversion joint 3 are provided with reserved steel bar holes, and the standard section prefabricated plate-shaped components 2 and the non-standard section prefabricated plate-shaped components are both provided with longitudinal force-bearing steel bars matching the reserved steel bar holes.

[0047] Specifically, the upper end plate 311 is provided with a plurality of upper reserved steel bar holes 33 on both sides along the width direction thereof, and a plurality of upper grid cavities 315 are provided below the plurality of upper reserved steel bar holes 33. The provision of the upper grid cavities 315 makes it easy to rotate the high-strength nut, and the upper longitudinal stress-bearing steel bars 21 that match the plurality of upper reserved steel bar holes are provided on both sides in the width direction of the lower end face of the standard-section prefabricated plate-shaped component 2. After the upper longitudinal stress-bearing steel bar 21 passes through the upper reserved steel bar holes 33, the high-strength nut is connected to the upper longitudinal stress-bearing steel bar 21 from the upper grid cavities 315, so that the standard-section prefabricated plate-shaped component 2 and the conversion joint 3 are fixedly connected.

[0048] The lower end plate 312 is provided with a plurality of lower reserved steel bar holes 34 on both sides along the width direction thereof, and a plurality of lower grid cavities 316 are provided above the plurality of lower reserved steel bar holes 34. The provision of the lower grid cavities 316 makes it easy to rotate the high-strength nut, and the upper end surface of the non-standard cross-section prefabricated plate-shaped component 4 is provided with lower longitudinal stress-bearing steel bars 41 that match the plurality of lower reserved steel bar holes 34 on both sides in the width direction. After the lower longitudinal stress-bearing steel bars 41 pass through the lower reserved steel bar holes 34, the high-strength nut is connected to the lower longitudinal stress-bearing steel bars 41 from the lower grid cavities 316, so that the non-standard cross-section prefabricated plate-shaped component 4 and the conversion joint 3 are fixedly connected.

[0049] The standard-section prefabricated plate-type component 2 and the non-standard prefabricated plate-type component in the utility model are connected by a conversion joint 3. The conversion joint 3 and the non-standard prefabricated plate-type component should be structurally connected in the factory, and the assembly connection with the standard-section prefabricated plate-type component 2 should be completed during the on-site segmented construction.

[0050] The joint box 31 is provided with micro-expansion concrete 35. The micro-expansion concrete 35 should have a fast hardening property, and is used to fill the gap between the joint box 31 and the stiffening plate 314, so as to improve the shear resistance and impermeability of the conversion joint 3.

[0051] In order to improve the waterproof performance, the upper end plate 311 is provided with expansion water stop strips 36 on both sides along its width direction. During splicing, the expansion water stop strips 36 are squeezed and deformed by the deadweight of the standard section prefabricated plate-shaped component 2 to seal the gap between the standard section prefabricated plate-shaped component 2 and the conversion joint 3; the bottom of the standard section prefabricated plate-shaped component 2 is provided with an embedded end plate 22. After the standard section prefabricated plate-shaped component 2 and the conversion joint 3 are installed, the embedded end plate 22 is welded to the upper end plate 311 of the joint box 31, so as to achieve reliable water stopping at the conversion joint 3.

[0052] Furthermore, in order to make the structure of each set of variable-section assembled underground anti-seepage walls more stable after being butted during the construction process, a groove 37 is provided along its height direction on the end face of one end in the length direction of the conversion joint 3, and the width of the groove 37 gradually narrows from top to bottom, and a groove 38 is provided along its height direction on the end face of one end in the length direction of the conversion joint 3 to match the groove 37. The conversion joint 3 adopts a variable-section streamlined concave groove 38 design, which is larger at the top and smaller at the bottom. Adjacent wall sections can be embedded in the groove 37 through the groove 38 to avoid deviation, extend the infiltration path at the joint between adjacent wall sections, and improve the longitudinal anti-seepage effect of the wall.

[0053] At the same time, grooves 38 and grooves 37 are also arranged on both sides of the standard-section prefabricated plate-type component 2 and the non-standard-section prefabricated plate-type component 4, but the widths of the grooves 38 and grooves 37 on the standard-section prefabricated plate-type component 2 and the non-standard-section prefabricated plate-type component 4 are evenly distributed.

[0054] The construction process of this embodiment is briefly described as follows:

[0055] Cement soil continuous wall 1 wall construction (such as Figure 7 The construction methods with strong adaptability to the strata, such as TRD and CSM, are used to ensure the quality of the cement soil continuous wall 1.

[0056] Standard section prefabricated plate components 2 hoisting and wall construction (such as Figure 8 The prefabricated plate-shaped component 4 with non-standard cross-section is lifted and inserted into the cement soil continuous wall 1 by mechanical equipment such as crawler crane and automobile crane, and the bottom elevation of the joint box 31 is controlled by a positioning device to just enter the cement soil continuous wall 1.

[0057] Prefabricated slab-shaped components splicing construction (such as Figure 8As shown). Position the expansion water stop strip 36 and place it on the upper part of the upper end plate 311 of the joint box 31, lift the standard section prefabricated plate-shaped component 2, and let its longitudinal force-bearing steel bars pass through the reserved steel bar holes of the joint box 31. After the docking is completed, fix it with high-strength nuts, and weld the embedded steel plate and the upper end plate 311 of the joint box 31.

[0058] Filling construction of micro-expansion concrete 35 at the joint (such as Figure 8 The micro-expansion concrete 35 is used to fill the gap between the joint box 31 and the stiffening plate 314 to make the surface uniform and smooth.

[0059] Adjacent wall construction (such as Fig. 9 The standard section prefabricated plate-shaped component 2 is lowered to the designed elevation, and the above process is repeated to embed the adjacent wall groove 38 into the preceding groove 37, and the adjacent wall construction is completed (as shown in FIG. Fig.10 as shown).

[0060] In the utility model, prefabricated and assembled components are adopted, which are factory-produced and require no maintenance time, thereby ensuring the quality of the anti-seepage wall during construction. In addition, the stress distribution of the anti-seepage wall adopts an enlarged cross-section design where the bending moment of the component section is large, and a reduced cross-section design is adopted where the bending moment of the section is small, and a reliable connection of components with different cross-sections is achieved through a conversion joint 3, thereby improving the cross-section utilization rate of the prefabricated components and reducing the design engineering cost of the anti-seepage wall. In addition, expansion water stop strips 36 and welding are adopted at the joints to improve the anti-seepage ability, realize the rapid assembly of prefabricated components with different cross-sections, and improve the bending, shear and seepage resistance of the joints.

[0061] Embodiment 2: A variable-section assembled underground anti-seepage wall mainly comprises the following parts: a cement-soil continuous wall 1, a standard-section prefabricated plate-type component 2, a conversion joint 3 and a non-standard-section prefabricated plate-type component 4.

[0062] The cement soil continuous wall 1 is continuously set along the horizontal and depth directions of the foundation pit, and the wall width should be greater than the cross-sectional width of the standard section prefabricated plate-type component 2 by more than 150mm. The standard section prefabricated plate-type component 2 and the non-standard section prefabricated plate-type component 4 can be prefabricated sheet piles or prefabricated walls, which are standardized in the factory to ensure the quality of the wall and improve the bending and crack resistance of the anti-seepage wall; the thickness of the former is generally 400~1000mm, and the latter can adjust the wall thickness according to the design requirements, which is generally not less than 200mm.

[0063] The conversion joint 3 mainly includes a joint box 31, which is composed of an upper end plate 311 and a lower end plate 312. The sides of the upper end plate 311 and the lower end plate 312 at both ends in the length direction are connected by welding with the side plates 313; the sides of the upper end plate 311 and the lower end plate 312 at both ends in the width direction are connected by welding with the stiffening plate 314. At the same time, reserved openings 32 are provided on the upper end plate 311 and the lower end plate 312. In this embodiment, there are two reserved openings 32, and the two reserved openings 32 are arranged along the length direction thereof. In addition, reserved channels matching the reserved openings 32 are provided on the standard section prefabricated plate-type components 2 and the non-standard section prefabricated plate-type components 4.

[0064] The upper and lower end faces of the conversion joint 3 are provided with reserved steel bar holes, and the standard section prefabricated plate-shaped components 2 and the non-standard section prefabricated plate-shaped components are both provided with longitudinal force-bearing steel bars matching the reserved steel bar holes.

[0065] Specifically, the upper end plate 311 is provided with a plurality of upper reserved steel bar holes 33 on both sides along the width direction thereof, and a plurality of upper grid cavities 315 are provided below the plurality of upper reserved steel bar holes 33. The provision of the upper grid cavities 315 makes it easy to rotate the high-strength nut, and the upper longitudinal stress-bearing steel bars 21 that match the plurality of upper reserved steel bar holes are provided on both sides in the width direction of the lower end face of the standard-section prefabricated plate-shaped component 2. After the upper longitudinal stress-bearing steel bar 21 passes through the upper reserved steel bar holes 33, the high-strength nut is connected to the upper longitudinal stress-bearing steel bar 21 from the upper grid cavities 315, so that the standard-section prefabricated plate-shaped component 2 and the conversion joint 3 are fixedly connected.

[0066] The lower end plate 312 is provided with a plurality of lower reserved steel bar holes 34 on both sides along the width direction thereof, and a plurality of lower grid cavities 316 are provided above the plurality of lower reserved steel bar holes 34. The provision of the lower grid cavities 316 makes it easy to rotate the high-strength nut, and the upper end surface of the non-standard cross-section prefabricated plate-shaped component 4 is provided with lower longitudinal stress-bearing steel bars 41 that match the plurality of lower reserved steel bar holes 34 on both sides in the width direction. After the lower longitudinal stress-bearing steel bars 41 pass through the lower reserved steel bar holes 34, the high-strength nut is connected to the lower longitudinal stress-bearing steel bars 41 from the lower grid cavities 316, so that the non-standard cross-section prefabricated plate-shaped component 4 and the conversion joint 3 are fixedly connected.

[0067] The standard-section prefabricated plate-type component 2 and the non-standard prefabricated plate-type component in the utility model are connected by a conversion joint 3. The conversion joint 3 and the non-standard prefabricated plate-type component should be structurally connected in the factory, and the assembly connection with the standard-section prefabricated plate-type component 2 should be completed during the on-site segmented construction.

[0068] The joint box 31 is provided with micro-expansion concrete 35. The micro-expansion concrete 35 should have a fast hardening property, and is used to fill the gap between the joint box 31 and the stiffening plate 314, so as to improve the shear resistance and impermeability of the conversion joint 3.

[0069] In order to improve the waterproof performance, the upper end plate 311 is provided with expansion water stop strips 36 on both sides along its width direction. During splicing, the expansion water stop strips 36 are squeezed and deformed by the deadweight of the standard section prefabricated plate-shaped component 2 to seal the gap between the standard section prefabricated plate-shaped component 2 and the conversion joint 3; the bottom of the standard section prefabricated plate-shaped component 2 is provided with an embedded end plate 22. After the standard section prefabricated plate-shaped component 2 and the conversion joint 3 are installed, the embedded end plate 22 is welded to the upper end plate 311 of the joint box 31, so as to achieve reliable water stopping at the conversion joint 3.

[0070] Furthermore, in order to make the structure of each set of variable-section assembled underground anti-seepage walls more stable after being butted during the construction process, a groove 37 is provided along its height direction on the end face of one end in the length direction of the conversion joint 3, and the width of the groove 37 gradually narrows from top to bottom, and a groove 38 is provided along its height direction on the end face of one end in the length direction of the conversion joint 3 to match the groove 37. The conversion joint 3 adopts a variable-section streamlined concave groove 38 design, which is larger at the top and smaller at the bottom. Adjacent wall sections can be embedded in the groove 37 through the groove 38 to avoid deviation, extend the infiltration path at the joint between adjacent wall sections, and improve the longitudinal anti-seepage effect of the wall.

[0071] At the same time, grooves 38 and grooves 37 are also arranged on both sides of the standard-section prefabricated plate-type component 2 and the non-standard-section prefabricated plate-type component 4, but the widths of the grooves 38 and grooves 37 on the standard-section prefabricated plate-type component 2 and the non-standard-section prefabricated plate-type component 4 are evenly distributed.

[0072] This embodiment is similar in structure to the embodiment 1, except that anchor plates 39 are provided on both sides of the width direction of the lower end plate 312, that is, two anchor plates 39 are provided, and the two anchor plates 39 are provided along the width direction of the lower end plate 312. Since the conversion joint 3 and the non-standard section prefabricated plate-type component 4 should be structurally connected in the factory, the anchor plates 39 are connected to the lower end plate 312 of the joint box 31 by welding during the connection. When the non-standard section prefabricated plate-type component 4 is produced in the factory, the anchor rods are embedded in the non-standard prefabricated plate-type component, and the lower longitudinal stress-bearing steel bars 41 of the non-standard prefabricated plate-type component are passed through the lower reserved steel bar holes 34. After the structural connection with the lower end plate 312 of the joint box 31 is completed by high-strength nuts, the concrete pouring of the non-standard section prefabricated plate-type component 4 is performed, thereby achieving the purpose of reliable water stopping between the non-standard section prefabricated plate-type component 4 and the conversion joint 3, and the coordination of stress and deformation.

[0073] The construction process of this embodiment is briefly described as follows:

[0074] 1) Cement soil continuous wall 1 wall construction (such as Figure 7 The construction methods with strong adaptability to the strata, such as TRD and CSM, are used to ensure the quality of the cement soil continuous wall 1.

[0075] 2) Standard section prefabricated plate components 2 hoisting and wall construction (such as Figure 8 The prefabricated plate-shaped component 4 with non-standard cross-section is lifted and inserted into the cement soil continuous wall 1 by mechanical equipment such as crawler crane and automobile crane, and the bottom elevation of the joint box 31 is controlled by a positioning device to just enter the cement soil continuous wall 1.

[0076] 3) Construction of prefabricated slab components (e.g. Figure 8 As shown). Position the expansion water stop strip 36 and place it on the upper part of the upper end plate 311 of the joint box 31, lift the standard section prefabricated plate-shaped component 2, and let its longitudinal force-bearing steel bars pass through the reserved steel bar holes of the joint box 31. After the docking is completed, fix it with high-strength nuts, and weld the embedded steel plate and the upper end plate 311 of the joint box 31.

[0077] 4) Fill the joint with 35% micro-expansion concrete (such as Figure 8 The micro-expansion concrete 35 is used to fill the gap between the joint box 31 and the stiffening plate 314 to make the surface uniform and smooth.

[0078] 5) Adjacent wall construction (such as Fig. 9 The standard section prefabricated plate-shaped component 2 is lowered to the designed elevation, and the above process is repeated to embed the adjacent wall groove 38 into the preceding groove 37, and the adjacent wall construction is completed (as shown in FIG. Fig.10 as shown).

[0079] In the utility model, prefabricated and assembled components are adopted, which are factory-produced and require no maintenance time, thereby ensuring the quality of the anti-seepage wall during construction. In addition, the stress distribution of the anti-seepage wall adopts an enlarged cross-section design where the bending moment of the component section is large, and a reduced cross-section design is adopted where the bending moment of the section is small, and a reliable connection of components with different cross-sections is achieved through a conversion joint 3, thereby improving the cross-section utilization rate of the prefabricated components and reducing the design engineering cost of the anti-seepage wall. In addition, expansion water stop strips 36 and welding are adopted at the joints to improve the anti-seepage ability, realize the rapid assembly of prefabricated components with different cross-sections, and improve the bending, shear and seepage resistance of the joints.

[0080] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A variable cross-section assembled underground anti-seepage wall, characterized in that: include: Standard-section prefabricated plate components, conversion joints and non-standard-section prefabricated plate components are provided with reserved steel bar holes at both end faces of the conversion joints. Standard-section prefabricated plate components and non-standard-section prefabricated plate components are both provided with longitudinal force-bearing steel bars that match the reserved steel bar holes.

2. The variable cross-section assembled underground anti-seepage wall according to claim 1 is characterized in that: The conversion joint includes a joint box, which includes an upper end plate and a lower end plate; the sides of the upper end plate and the lower end plate at both ends in the length direction are connected by side plates; the sides of the upper end plate and the lower end plate at both ends in the width direction are connected by stiffening plates.

3. The variable cross-section assembled underground anti-seepage wall according to claim 2 is characterized in that: The upper end plate and the lower end plate are both provided with reserved openings.

4. The variable cross-section assembled underground anti-seepage wall according to claim 2 is characterized in that: The upper end plate is provided with a plurality of upper reserved steel bar holes on both sides along its width direction, and the upper longitudinal force-bearing steel bars cooperating with the plurality of upper reserved steel bar holes are provided on both sides in the width direction of the lower end surface of the standard section prefabricated plate-type component.

5. The variable cross-section assembled underground anti-seepage wall according to claim 4 is characterized in that: The upper end plate is provided with expansion water stop strips on both sides along the width direction thereof.

6. The variable cross-section assembled underground anti-seepage wall according to any one of claims 1 to 5, characterized in that the conversion One end face of the joint in the length direction is provided with a groove along its height direction, the width of the groove gradually narrows from top to bottom, and one end face of the conversion joint in the length direction is provided with a tenon matching the groove along its height direction.

7. The variable cross-section assembled underground anti-seepage wall according to claim 2 is characterized in that: The lower end plate is provided with a plurality of lower reserved steel bar holes on both sides along its width direction, and the upper end surface of the non-standard section prefabricated plate-type component is provided with lower longitudinal force-bearing steel bars matching with the plurality of lower reserved steel bar holes on both sides in the width direction.

8. The variable cross-section assembled underground cut-off wall according to claim 2, 3, 4, 5 or 7, characterized in that: Micro-expansive concrete is provided in the joint box.

9. The variable cross-section assembled underground cut-off wall according to claim 2, 3, 4, 5 or 7, characterized in that: Anchor plates are arranged on both sides of the lower end plate in the width direction.

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