Precast concrete basement outer wall

Abstract

The utility model provides a prefabricated concrete basement outer wall, and relates to the field of fabricated buildings, and the prefabricated concrete basement outer wall comprises a prefabricated single-face laminated shear wall and a non-dismantling formwork; the prefabricated single-face laminated shear wall comprises a prefabricated wall plate and a pouring wall plate, and the prefabricated wall plate and the pouring wall plate are laminated by pouring concrete on site; a cavity structure is arranged between the non-dismantling formwork and the prefabricated single-face laminated shear wall, the pouring wallboard is formed by pouring the cavity structure, and the non-dismantling formwork and the prefabricated single-face laminated shear wall are fixed through a limiting and opposite-pulling assembly. The prefabricated concrete basement exterior wall structure is highly industrialized and highly integrated and is directly poured on site after being prefabricated and formed in a factory, the assembly precision is improved, steel bar binding and formwork supporting are not needed on site, labor force is saved, and the construction efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of prefabricated building engineering, in particular to a prefabricated concrete underground outdoor wall. BACKGROUND

[0002] The underground outdoor wall is generally a continuous shear wall structure, connected with the house foundation, and is a widely used underground structure of the house. The underground outdoor wall simultaneously bears the lateral pressure of the backfill outside the foundation pit and various combined loads conducted by the upper structure, and also needs to have a waterproof function. The existing underground outdoor wall structure is generally a cast-in-place system, and its general construction process is as follows: steel bar binding, double-sided formwork support, concrete pouring and maintenance, and formwork removal. Therefore, at least the following technical defects exist:

[0003] Limited construction surface: since the underground outdoor wall is adjacent to the edge of the excavated foundation trench, the slope of the foundation trench directly affects the construction surface of the outdoor wall, that is, the external formwork support is seriously affected; the on-site cutting and binding of the steel bar is slow and has poor precision; the on-site formwork support and formwork removal procedure is complex, and the construction cost is high; the on-site construction procedure is complex, and the efficiency is low; the construction period is long, and the cost is high. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a prefabricated concrete underground outdoor wall to solve the technical problems proposed in the background art.

[0005] To achieve the purpose of the present application, the present application provides the following technical solutions:

[0006] The present application provides a prefabricated concrete underground outdoor wall, comprising: a prefabricated single-face composite shear wall, including a prefabricated wallboard and a poured wallboard, the composite of the prefabricated wallboard and the poured wallboard being achieved by pouring concrete on site; a demouldable formwork, including a demouldable formwork bottom plate, a demouldable formwork middle plate and a demouldable formwork top plate arranged in sequence along the height direction of the prefabricated single-face composite shear wall, the demouldable formwork and the prefabricated single-face composite shear wall having a cavity structure therebetween, the poured wallboard being formed by pouring the cavity structure, and the demouldable formwork and the prefabricated single-face composite shear wall being fixedly connected through a limiting and counter-pulling assembly.

[0007] Further, the prefabricated single-face composite shear wall further comprises an internal steel mesh and an external steel mesh, the internal steel mesh being fixedly poured in the prefabricated wallboard, the external steel mesh being fixedly poured in the poured wallboard, and the internal steel mesh and the external steel mesh being fixedly connected through a tie bar.

[0008] Further, the limiting and pulling assembly is used for limiting the removable formwork and forming a pulling force between the prefabricated single-sided composite shear wall and the removable formwork, and the limiting and pulling assembly comprises a screw rod, which comprises an anchoring end and a connecting end, the anchoring end and the connecting end are perpendicular to each other, the anchoring end is embedded in the prefabricated wall, and the connecting end is externally sleeved with the dumbbell-shaped clamping piece and connected with each removable formwork through the dumbbell-shaped clamping piece.

[0009] Further, the width of the first clamping groove is greater than or equal to the thickness of the removable formwork.

[0010] Further, the removable formwork further comprises a removable formwork fixing base and a removable formwork top clamping piece, the removable formwork fixing base is fixed on the outer wall foundation, comprises oppositely arranged first and second fixing bases, the removable formwork fixing base is arranged along the bottom of the removable formwork bottom plate, and the removable formwork bottom plate is fixed between the first and second fixing bases, and the removable formwork top clamping piece comprises a second clamping groove, and the second clamping groove is used for abutting against the removable formwork top plate.

[0011] Further, the removable formwork top clamping piece further comprises a pulling rod, the second clamping groove is fixedly connected with the pulling rod, one end of the pulling rod is embedded in the prefabricated wall, and the other end abuts against the removable formwork top plate through the second clamping groove.

[0012] Further, each removable formwork comprises a plate body and a plurality of semicircular clamping holes, the semicircular clamping holes are arranged at the top and / or bottom of the plate body along the length direction of the plate body, and are used for clamping the limiting and pulling assembly or the fixing base.

[0013] Further, the removable formwork is a cement-based material.

[0014] Further, the outer wall foundation is embedded with a water-stopping steel plate, and the water-stopping steel plate is partially exposed in the cavity structure of the poured wall.

[0015] The application provides a highly industrialized and integrated prefabricated concrete outdoor wall structure, which is directly poured on site after being prefabricated in a factory, improves assembly precision, does not need steel binding and formwork support on site, greatly saves labor, does not need formwork on site, has low requirements on slope of a foundation pit, greatly improves construction efficiency, greatly reduces engineering cost, is once maintained and formed, and has low energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with embodiments of the present application, and do not constitute a limitation on the present application;

[0017] Figure 1 A prefabricated concrete underground room outer wall whole structure schematic diagram provided for an embodiment of the present application;

[0018] Figure 2 A prefabricated single-face composite shear wall structure schematic diagram provided for an embodiment of the present application;

[0019] Figure 3 A demoulding-free formwork fixing base structure schematic diagram provided for an embodiment of the present application;

[0020] Figure 4 A limiting and counter-pulling assembly structure schematic diagram provided for an embodiment of the present application;

[0021] Figure 5 A demoulding-free formwork top clamping piece structure schematic diagram provided for an embodiment of the present application;

[0022] Figure 6 A demoulding-free formwork bottom plate structure schematic diagram provided for an embodiment of the present application;

[0023] Figure 7 A demoulding-free formwork middle plate structure schematic diagram provided for an embodiment of the present application;

[0024] Figure 8 A demoulding-free formwork top plate structure schematic diagram provided for an embodiment of the present application;

[0025] Figure 9 An underground room outer wall assembly process schematic diagram provided for an embodiment of the present application;

[0026] Reference signs: 1, prefabricated single-sided composite shear wall; 11, prefabricated wallboard; 12, stress reinforcement system; 13, tie bar; 14, inner cavity rough surface; 2, outer wall foundation; 3, foundation tie bar; 4, water stop steel plate; 5, removable formwork fixing base; 51, angle steel; 52, anchor nail; 6, limiting and counter-pulling assembly; 61, screw rod; 62, anchor end; 63, dumbbell-shaped clamping piece; 64, positioning gasket; 65, matching nut; 66, conventional gasket; 7, removable formwork top clamping piece; 71, counter-pulling rod; 72, anchor section; 73, second clamping groove; 8, removable formwork bottom plate; 81, first plate body; 82, bottom surface of removable formwork bottom plate; 83, top surface of removable formwork bottom plate; 84, first semicircular hole structure; 9, removable formwork middle plate; 91, second plate body; 92, bottom surface of removable formwork middle plate; 93, top surface of removable formwork middle plate; 94, second semicircular hole structure; 95, third semicircular hole structure; 10, removable formwork top plate; 101, third plate body; 102, top surface of removable formwork top plate; 103, bottom surface of removable formwork top plate; 104, fourth semicircular hole structure; 15, cavity structure. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the present application clearer, the following will be combined with the accompanying drawings for a clear and complete description of the technical solutions in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0028] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features; in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0029] The embodiment provides a prefabricated concrete basement outdoor wall structure, which aims to overcome the shortcomings of the traditional cast-in-place basement outdoor wall structure and construction process, realize prefabrication and assembly of the basement outdoor wall, and improve construction efficiency and quality. According to the prefabricated concrete basement outdoor wall structure, the prefabricated single-sided composite shear wall is provided with a prefabricated wallboard, a stress reinforcement system, a tie bar, and an inner cavity rough surface. Figure 1As shown, the prefabricated concrete underground outdoor wall structure comprises: a prefabricated single-face composite shear wall 1, including a prefabricated wallboard 11 and a cast wallboard, the composite of the prefabricated wallboard 11 and the cast wallboard is achieved by casting concrete on site; a formwork-free template, including a formwork-free template bottom plate 8, a formwork-free template middle plate 9 and a formwork-free template top plate 10 arranged in sequence along the height direction of the prefabricated single-face composite shear wall 1, the formwork-free template and the prefabricated single-face composite shear wall 1 have a cavity structure 15 therebetween, the cast wallboard is formed by casting the cavity structure 15, and the formwork-free template and the prefabricated single-face composite shear wall 1 are fixedly connected through a limiting and counter-pulling assembly 6.

[0030] Specifically, the prefabricated single-face composite shear wall 1, that is, a part is prefabricated in a factory (prefabricated wallboard 11), and the other part is cast in concrete on site (cast wallboard), the cast wallboard and the prefabricated wallboard 11 are overlapped by casting on site, so that the weight of the prefabricated component can be reduced, and waterproofing can be effectively achieved. The wall steel bar system (steel bar cage) is integrally arranged in the prefabricated wallboard 11 part, the prefabricated wallboard contains load-bearing steel bars, and simultaneously serves as a wall outer formwork during casting on site. According to the prefabricated single-face composite shear wall 1, the prefabricated wallboard 11 is used as a formwork during casting on site, so that the formwork does not need to be removed after casting, and the formwork-free template is not required, thereby saving the cost of the formwork-free template and reducing the construction cost. Figure 2 As shown, the prefabricated single-face composite shear wall 1 specifically comprises: a prefabricated wallboard 11, a load-bearing steel bar system 12 (including an internal steel bar mesh fixed in the prefabricated wallboard 11 and an external steel bar mesh fixed in the cast wallboard) and an internal cavity rough surface 14. The prefabricated wallboard 11 is a single-face composite wallboard, internally contains an internal steel bar mesh for single-piece wall load bearing, and simultaneously serves as a formwork during casting on site; the internal steel bar mesh in the load-bearing steel bar system 12 is cast in the single-piece prefabricated wallboard 11 in a factory, and the external steel bar mesh and the internal steel bar mesh are tied together by tie bars 13, that is, the prefabricated wallboard 11 is prefabricated, the steel bar system of the basement outer wall is integrally arranged therein, one piece is in the concrete slab, and the other piece is exposed. When the prefabricated wallboard 11 is formed, the inside is roughened to form the internal cavity rough surface 14, so as to be overlapped with the cast concrete of the cavity for secondary casting, and the adhesion between the two is enhanced.

[0031] Further, according to the prefabricated single-face composite shear wall 1, Figure 1 As shown, the basement outer wall structure further comprises an outer wall foundation 2, a foundation tie bar 3 and a water stop steel plate 4. The outer wall foundation 2 is pre-buried with the water stop steel plate 4, and the water stop steel plate 4 is partially exposed in the cavity structure 15 of the cast wallboard.

[0032] Further, the limiting and counter-pulling assembly 6 is used for limiting the formwork-free template, fixing the formwork-free template at a designed position, forming a counter-pulling between the prefabricated single-face composite shear wall 1 and the formwork-free template, and preventing the formwork from swelling during concrete casting. In the embodiment, a limiting and counter-pulling bolt assembly is preferred, according to the limiting and counter-pulling bolt assembly, Figure 3As shown. Including: screw rod 61, including anchoring end 62 and connecting end, the anchoring end 62 and the connecting end perpendicular to each other, the anchoring end 62 is embedded in the prefabricated wallboard 11 inside, the outside of the connecting end is provided with the dumbbell type card 63 and connects each of the removable formwork through the dumbbell type card 63; dumbbell type card 63, provided with through hole, the screw rod 61 passes through the through hole and is connected with the dumbbell type card 63, the dumbbell type card 63 is provided with flange at both ends perpendicular to the screw rod 61, two the flanges constitute the first clamping groove, the first clamping groove is used for abutting each removable formwork.

[0033] Preferably, the screw rod 61 is made of steel material, and the specification size is determined by mechanical design. The dumbbell type card 63 is made of plastic material. The limiting and pulling bolt group further includes a positioning washer 64, a matching nut 65 and a conventional washer 66. The first clamping groove width of the dumbbell type card 63 is not less than the thickness of the removable formwork.

[0034] Further, the removable formwork includes removable form bottom plate 8, removable form middle plate 9 and removable form top plate 10 arranged in turn along the height direction of the prefabricated single-sided composite shear wall 1; wherein the bottom surface of the removable form bottom plate 8 is connected with the removable form fixed base 5, and the top surface is connected with the removable form middle plate 9 through the first clamping groove of the limiting and pulling assembly 6; the removable form middle plate 9 includes multiple sections, each section is clamped through the limiting and pulling assembly 6, the top surface is connected with the removable form top plate 10 through the first clamping groove, and the bottom surface is connected with the removable form bottom plate 8 through the first clamping groove; the top of the removable form top plate 10 abuts against the removable form top card 7, and the removable form top card 7 includes a second clamping groove 73 abutting against the removable form top plate 10.

[0035] Further, according to Figure 4 As shown, the removable form fixed base 5 is fixed on the outer wall foundation 2, including angle steel 51 and anchoring nail 52. The L-shaped angle steel 51 is arranged along the top surface of the outer wall foundation 2; the anchoring nail 52: anchors the angle steel 51 and the top surface of the foundation firmly. The left part of the angle steel 51 is the first fixed base, and the right part is the second fixed base; the removable form fixed base 5 is arranged along the bottom of the removable form bottom plate 8, and the removable form bottom plate 8 is fixed between the first fixed base and the second fixed base. Preferably, the width of the middle seam of the removable form fixed base 5 is not greater than the thickness of the removable formwork.

[0036] Further, according to Figure 5 As shown, the removable form top card 7 includes a pulling rod 71, an anchoring section 72 and a second clamping groove 73. The pulling rod 71 is preferably made of steel material, the anchoring section 72 is embedded in the prefabricated concrete wall plate, and the second clamping groove 73 is a channel steel type card, which can be welded and used for abutting against the removable form top plate 10.

[0037] Further, the removable formwork is the formwork that restricts the concrete during the concrete pouring, and the formwork is not removed after the concrete hardens, and is permanently combined with the concrete. Figure 6 As shown in the figure, the removable formwork bottom plate 8 includes: a first plate body 81, whose material and specifications are determined by the design, and is generally prepared by cement-based materials, such as cement fiber board, etc.; a removable formwork bottom plate bottom surface 82, which is clamped between the fixed base; and a removable formwork bottom plate top surface 83, which is tightly pressed by the first clamping groove on the bottom surface of the removable formwork middle plate 9 above. Preferably, the removable formwork bottom plate top surface 83 also has a first semicircular hole structure 84, which is used to clamp and fix the neck of the first clamping groove of the dumbbell-shaped clamping piece 63, so as to temporarily fix the removable formwork of the whole wall layer by layer.

[0038] Further, the removable formwork middle plate 9 includes multiple sections and is located between the removable formwork top plate 10 and the bottom plate. According to Figure 7 As shown in the figure, it includes: a second plate body 91, whose material and specifications are determined by the design, and is generally prepared by cement-based materials, such as cement fiber board, etc.; each section is clamped by limiting and counter-pulling bolt assemblies, the top surface of the removable formwork middle plate is connected to the removable formwork top plate 10 through the first clamping groove, and the bottom surface 92 of the removable formwork middle plate is connected to the removable formwork bottom plate 8 through the first clamping groove. The bottom surface 92 of the removable formwork middle plate has a third semicircular hole structure 95, and the top surface 93 of the removable formwork middle plate has a second semicircular hole structure 94; the semicircular holes on the bottom surface are correspondingly arranged with the semicircular holes on the top surface 83 of the removable formwork bottom plate; and the semicircular holes on the top surface are correspondingly arranged with the semicircular holes on the bottom surface 103 of the removable formwork top plate.

[0039] Further, according to Figure 8 As shown in the figure, the removable formwork top plate 10 includes: a third plate body 101, whose material and specifications are determined by the design, and is generally prepared by cement-based materials, such as cement fiber board, etc.; the bottom surface 103 of the removable formwork top plate has a fourth semicircular hole structure 104, which is correspondingly arranged with the semicircular holes of the removable formwork middle plate 9; and the top surface 102 of the removable formwork top plate is clamped with the second clamping groove 73 of the removable formwork top clamping piece 7.

[0040] Further, according to Figure 1 As shown in the figure, when the removable formwork is manufactured in the factory, the cavity structure 15 is formed between the removable formwork and the prefabricated single-face laminated shear wall 1, and the concrete is poured in the cavity 15 during the on-site construction. In addition to the counter-pulling bolt assemblies shown in the figure, the cavity structure 15 also has the force-bearing steel bar system 12 of another part of the wall which is not shown. The force-bearing steel mesh on one side of the wall is placed in the prefabricated single-face laminated shear wall.

[0041] According to the prefabricated concrete underground outdoor wall provided in the above specific embodiment, the embodiment further provides a construction method of the prefabricated concrete underground outdoor wall, according to Figure 9 As shown in the figure, the method includes the following steps:

[0042] 1. Foundation preparation: waterproof board and foundation sling 3 are traditional crafts, and are constructed according to design requirements;

[0043] 2. Prefabricated single-sided composite shear wall 1 (in the factory), including:

[0044] a. Preparation of the mold table;

[0045] b. Side mold: determine the size of the side mold according to the size of the wallboard;

[0046] c. Wall steel bar binding and laying: the whole wall force steel bar system 12 forms a steel cage, and the steel mesh on one side is placed in the side mold;

[0047] d. Install the screw rod 61 in the tension bolt set, that is, deep into the side mold and temporarily fixed;

[0048] e. Concrete pouring and roughening treatment;

[0049] f. Component maintenance and molding;

[0050] g. Disassemble the side mold; single-sided composite shear wall production is complete.

[0051] 3. Accessory preparation, including:

[0052] a. Limiting and tension bolt set: traditional process, among which the dumbbell-shaped clamping piece 63 is cast into shape at one time, and the rest are standard accessories;

[0053] b. Demoulding formwork fixed base: traditional angle steel 51 is prepared and anchored to the top surface of the foundation according to the design requirements;

[0054] c. Demoulding formwork top clamping piece: traditional accessory welding molding;

[0055] d. Demoulding formwork bottom plate 8, demoulding formwork middle plate 9 and demoulding formwork top plate 10, all are cut and drilled according to the design requirements;

[0056] 4. On-site installation, including:

[0057] a. Single-sided composite shear wall in place and temporary support and fixation: traditional process;

[0058] b. Install positioning gasket 64: its main function is to control the thickness of the wall steel bar protection layer, that is, to prevent the dumbbell-shaped clamping piece 63 from moving towards the center of the wall;

[0059] c. Install the first piece of demoulding formwork bottom plate 8: the bottom is inserted into the demoulding formwork base, and the top is clamped into the lower slot of the first clamping slot of the dumbbell-shaped clamping piece 63;

[0060] d. Install the conventional gasket 66;

[0061] e. Locking nut;

[0062] f, and so on to install the intermediate formwork which can be removed without disassembly;

[0063] g, install the top formwork which can be removed without disassembly;

[0064] 5, concrete pouring and curing;

[0065] 6, completion of the basement outer wall.

[0066] The beneficial effects of the embodiments of the present application are as follows:

[0067] Preformed in the factory, meeting the requirements of the assembly type building process advocated by China; no need for steel bar binding and formwork support on site, greatly saving labor; no need for formwork on site, low requirement for the slope of the foundation pit, i.e. directly hoisting the preformed wall into place, no need for a large working surface, especially on the outer side of the wall; preformed in the factory, with better precision; the cavity of the preformed wall can be continuously cast in place, eliminating the hidden danger of seepage and leakage; one-time curing and molding, low energy consumption.

[0068] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. The present application is not limited to the exact structure described above and illustrated in the drawings, and the specific implementation of the present application should not be considered limited to the above description. For those skilled in the art to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be considered within the scope of protection of the present application.

Claims

1. A precast concrete below-grade exterior wall, characterized by, The application relates to a prefabricated single-face composite shear wall (1) and a formwork thereof. The prefabricated single-face composite shear wall (1) comprises a prefabricated wall plate (11) and a cast wall plate, and the composite of the prefabricated wall plate (11) and the cast wall plate is achieved by casting concrete on site. The formwork comprises a formwork bottom plate (8), a formwork middle plate (9) and a formwork top plate (10) arranged in sequence along the height direction of the prefabricated single-face composite shear wall (1), and a cavity structure (15) is formed between the formwork and the prefabricated single-face composite shear wall (1), the cast wall plate is formed by casting the cavity structure (15), and the formwork and the prefabricated single-face composite shear wall (1) are fixedly connected through a limiting and counter-pulling assembly (6).

2. The precast concrete below-grade outdoor wall of claim 1, wherein, The prefabricated single-face composite shear wall (1) further comprises an internal steel mesh and an external steel mesh, the internal steel mesh is fixedly arranged in the prefabricated wall plate (11) by casting, the external steel mesh is fixedly arranged in the cast wall plate, and the internal steel mesh and the external steel mesh are fixedly connected through a tie bar (13).

3. The precast concrete below-grade outdoor wall of claim 1, wherein, The limiting and counter-pulling assembly (6) is used for limiting the formwork and forming counter-pulling between the prefabricated single-face composite shear wall (1) and the formwork, and the limiting and counter-pulling assembly (6) comprises a screw rod (61) and a dumbbell-shaped clamping piece (63). The screw rod (61) comprises an anchoring end (62) and a connecting end, the anchoring end (62) is perpendicular to the connecting end, the anchoring end (62) is embedded in the prefabricated wall plate (11), and the connecting end is externally provided with the dumbbell-shaped clamping piece (63) and connected with each formwork through the dumbbell-shaped clamping piece (63). The dumbbell-shaped clamping piece (63) is provided with a through hole, the screw rod (61) is connected with the dumbbell-shaped clamping piece (63) through the through hole, flanges are arranged at both ends of the dumbbell-shaped clamping piece (63) which are perpendicular to the screw rod (61), and the two flanges form a first clamping groove, and the first clamping groove is used for abutting against each formwork.

4. The precast concrete below-grade outdoor wall of claim 3, wherein, The width of the first clamping groove is greater than or equal to the thickness of the formwork.

5. The precast concrete below-grade outdoor wall of claim 1, wherein, The formwork further comprises a formwork fixing base (5) and a formwork top clamping piece (7), the formwork fixing base (5) is fixed on an outer wall foundation (2) and comprises oppositely arranged first and second fixing bases, the formwork fixing base (5) is arranged along the bottom of the formwork bottom plate (8) and fixes the formwork bottom plate (8) between the first and second fixing bases, and the formwork top clamping piece (7) comprises a second clamping groove (73) which is used for abutting against the formwork top plate (10).

6. The precast concrete below-grade outdoor wall of claim 5, wherein, The formwork top clamping piece (7) further comprises a counter-pulling rod (71), the second clamping groove (73) is fixedly connected with the counter-pulling rod (71), one end of the counter-pulling rod (71) is embedded in the prefabricated wall plate (11), and the other end abuts against the formwork top plate (10) through the second clamping groove (73).

7. The precast concrete below-grade outdoor wall of claim 5, wherein, Each of the removable formworks comprises a plate body and a plurality of semicircular hole structures; the semicircular hole structures are arranged on the top and / or bottom of the plate body along the length direction of the plate body and used for clamping the limiting and pulling assembly (6) or the removable formwork fixing base (5).

8. The precast concrete below-grade outdoor wall of claim 7, wherein, The removable formwork is a cement-based material.

9. The precast concrete below-grade outdoor wall of claim 5, wherein, The outer wall base (2) is pre-buried with a water-stopping steel plate (4), and the water-stopping steel plate (4) is partially exposed in the cavity structure (15) of the cast wall plate.

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