Waterproof joints and construction techniques for prefabricated subway station side walls and base slabs with concealed beams

Abstract

This invention discloses a waterproof joint and construction process for a prefabricated subway station sidewall-base slab with a concealed beam, belonging to the field of underground structure construction technology. It mainly includes an inner leaf slab, an outer leaf slab, a cast-in-place base slab, and a concealed beam. A pre-reserved groove is provided on the cast-in-place base slab, with a waterproof groove and a rebar joint on each side of the groove. The inner leaf slab is connected to the cast-in-place base slab via a grouting sleeve, and the outer leaf slab is connected to the cast-in-place base slab via a flexible waterproof strip. The inner and outer leaf slabs are connected by truss reinforcement and tie bars. The concealed beam is placed within the pre-reserved groove, forming a central cavity between the inner and outer leaf slabs. The inner and outer leaf slabs, the central cavity, and the pre-reserved groove form a pouring area. After pouring, the concrete in the pouring area and the prefabricated sidewall together form a tenon structure embedded in the cast-in-place base slab. This invention significantly improves construction efficiency and reduces on-site mold consumption while ensuring structural load-bearing performance, exhibiting significant economic and environmental benefits.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated construction technology for underground structures, and particularly relates to the waterproof joint and construction process of prefabricated subway station side wall-bottom slab with hidden beams. Background Technology

[0002] In recent years, with the continuous maturation of prefabricated construction technology and strong national support for its development, prefabricated construction has developed rapidly. Prefabricated buildings are increasingly favored due to their advantages such as high efficiency, environmental friendliness, and convenience.

[0003] Currently, prefabricated construction technology has been widely applied to superstructures, while exploration of underground prefabricated structures is still in its early stages. With the rapid development of my country's social economy and urbanization, the problem of scarce urban land resources is becoming increasingly prominent. Ordinary surface transportation can no longer meet people's daily travel needs. The rational utilization and development of underground space resources is an important means to solve the problem of sustainable urban development. Therefore, large-scale development of underground space and underground transportation has become a necessary condition for alleviating traffic congestion, with subways becoming one of the main underground transportation solutions.

[0004] However, current subway station construction primarily utilizes open-cut and cast-in-place methods. This method also leads to long construction periods and consequently, long-term disruptions to surrounding traffic. Furthermore, the extended construction period makes it more difficult to predict various factors that could trigger foundation pit collapses, posing a threat to the safety of the construction site and surrounding buildings. For example, in 2015, a large amount of rainwater flooded the foundation pit at Jiuhuashan Station on Nanjing Metro Line 4, causing ground subsidence. In the same year, the drainage culvert at Beijing East Road Station on Nanjing Metro Line 4 suffered severe leakage due to long-term erosion from the silty geological environment, resulting in road surface collapse.

[0005] Furthermore, traditional cast-in-place construction methods are prone to drawbacks such as dust and noise pollution, excessive consumption of formwork materials, large numbers of workers on site, high labor intensity, and difficulty in quality control. Therefore, comprehensively promoting the application of prefabricated construction technology in the field of subway station construction is clearly necessary, urgent, and innovative.

[0006] In view of this, it is necessary to improve the shortcomings of the existing technology in order to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a waterproof joint and construction process for a prefabricated subway station side wall-bottom slab with a hidden beam, which can solve the problems of long construction cycle, poor joint waterproofing, and large consumption of molds in current subway stations.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] Waterproof joint between prefabricated subway station side wall and base slab with concealed beams, including:

[0010] The cast-in-place base slab has a horizontal and straight reserved groove. A row of steel bar joints is provided on one side along the length of the reserved groove, and a waterproof groove is provided on the other side.

[0011] Precast sidewalls, including:

[0012] The inner leaf plate is connected to the side of the cast-in-place base plate where the steel bar joint is provided. A row of grouting sleeves is vertically arranged on the inner bottom side of the inner leaf plate. The lower end of the row of grouting sleeves is open and the inside is hollow. The row of steel bar joints is embedded in the row of grouting sleeves so that the inner leaf plate is rigidly connected to the cast-in-place base plate. An inner steel bar mesh is provided inside the inner leaf plate.

[0013] The outer leaf plate is connected to the side of the cast-in-place base plate that is provided with a waterproof groove. A flexible waterproof strip is integrally formed on the outer bottom side of the outer leaf plate. The lower end of the flexible waterproof strip is embedded in the waterproof groove so that the outer leaf plate and the cast-in-place base plate are flexibly and sealed. An outer steel mesh is provided inside the outer leaf plate.

[0014] Truss reinforcement is used to connect the inner leaf plate and the outer leaf plate to improve the connection stiffness between the inner leaf plate and the outer leaf plate. The truss reinforcement is located between the inner leaf plate and the outer leaf plate, with one side extending into the interior of the inner leaf plate and connecting with the inner reinforcement mesh, and the other side extending into the interior of the outer leaf plate and connecting with the outer reinforcement mesh.

[0015] A concealed beam, the height of which is greater than the depth of the reserved groove, is placed within the reserved groove;

[0016] A central cavity is formed between the inner leaf plate and the outer leaf plate. The central cavity and the reserved groove form a casting area. After casting, the concrete in the casting area and the precast side wall together form a tenon structure embedded in the cast-in-place base plate.

[0017] Furthermore, the flexible waterproof strip has grooves on both sides of its middle section. After the flexible waterproof strip is compacted, there is sufficient expansion space on both sides of its middle section, so that the joint between the flexible waterproof groove and the waterproof strip is tightly spliced.

[0018] Furthermore, it also includes multiple tie bars, which are horizontally and parallelly arranged between the inner leaf plate and the outer leaf plate. One end of the tie bars is connected to the inner steel mesh in the inner leaf plate, and the other end is connected to the outer steel mesh in the outer leaf plate. The tie bars pass through the hidden beam so that the hidden beam, the inner leaf plate, and the outer leaf plate form a whole.

[0019] Furthermore, the upper end of the grouting sleeve is threaded to the bottom of the vertical reinforcing bar of the inner steel mesh and is built into the inner leaf plate. A grout outlet pipe and a grout injection pipe are connected vertically on one side of the grouting sleeve. The end of the grout outlet pipe and the grout injection pipe away from the grouting sleeve body is flush with the outer surface of the inner leaf plate.

[0020] Furthermore, the concealed beam includes longitudinal reinforcement and stirrups arranged sequentially along the length of the longitudinal reinforcement.

[0021] Furthermore, the flexible waterproof strip is made of rubber or polyurethane resin material.

[0022] Furthermore, the height of the joint surface of the cast-in-place base slab is greater than 1 / 3 of the height of the ground floor of the station, and the height of the cast-in-place base slab is less than 2m.

[0023] Furthermore, the inner steel mesh is distributed throughout the inner leaf plate, and the outer steel mesh is distributed throughout the outer leaf plate.

[0024] A construction process for a waterproof joint between the side wall and base slab of a prefabricated subway station with concealed beams includes the following steps:

[0025] S1. Precast side walls and cast-in-place base slabs are precast separately;

[0026] When casting the cast-in-place base slab, a pre-reserved groove is set on the cast-in-place base slab, and a steel bar joint and a waterproof groove are respectively set on both sides along the length of the pre-reserved groove.

[0027] When pouring the precast sidewall, a grouting sleeve is installed at the bottom of the inner leaf plate, and a flexible waterproof strip is integrally formed at the bottom of the outer leaf plate. The inner leaf plate and the outer leaf plate are fixed with truss steel bars. In addition, tie bars are connected between the inner leaf plate and the outer leaf plate. The tie bars pass through the hidden beam so that the hidden beam, the inner leaf plate, and the outer leaf plate form a whole.

[0028] S2. Connect the inner leaf plate with the grouting sleeve to the cast-in-place base plate with the steel bar joint on the corresponding side. Connect the outer leaf plate with the flexible waterproof strip in one piece to the cast-in-place base plate with the waterproof groove on the corresponding side. Place the hidden beam in the reserved groove on the cast-in-place base plate, and the height of the hidden beam is greater than the depth of the reserved groove.

[0029] S3. After the steel bar joints on the cast-in-place base slab are embedded in the grouting sleeve, grout is injected into the grouting sleeve through the grouting pipe to further tighten the connection between the inner leaf plate and the cast-in-place base slab. After the grout comes out of the grouting pipe, the grouting pipe and the grouting pipe are sealed respectively.

[0030] S4. There is a central cavity between the inner leaf plate and the outer leaf plate. The central cavity and the reserved groove form a casting area. After casting, the concrete in the casting area and the precast side wall together form a tenon structure. The tenon structure is embedded in the cast-in-place base plate to form a stable waterproof structure.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] (1) The precast side wall of the present invention can avoid the formwork process of the wall on the construction site by precasting two precast wall panels, simplifying the on-site construction process, and is economical and environmentally friendly. At the same time, by setting truss steel bars and tie bars between the two precast panels, the slippage between the new and old concrete interface is resisted, ensuring the rigidity of the entire wall.

[0033] (2) The joint structure between the side wall and the base slab described in this invention has a tension zone on the inner side of the joint structure, so a grouting sleeve is reserved for connection on the inner side of the joint. The compression zone is on the outer side of the joint structure, so a special waterproof strip is installed on the outer joint. In addition, the cast-in-place base slab is provided with a reserved groove and the casting area is formed by the cavity in the middle of the precast side wall. After casting, it forms a tenon together with the precast wall panel. The connection node between the cast-in-place base slab and the precast side wall is a semi-rigid connection, which has a certain degree of freedom under the action of earth pressure. Under the action of earth pressure, the inner grouting sleeve connection resists tensile stress, while the special waterproof strip on the outer joint is self-compacted under compressive stress, ensuring the waterproof performance of the joint. Attached Figure Description

[0034] The technical solution and its beneficial effects of the present invention will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0035] Figure 1 This is a perspective view of a prefabricated waterproof joint between the side wall and the bottom plate of a subway station with a hidden beam, provided in an embodiment of the present invention.

[0036] Figure 2 This is a front view of a waterproof joint between the side wall and bottom slab of a prefabricated subway station with a hidden beam, provided in an embodiment of the present invention.

[0037] Figure 3 This is a top view of a prefabricated side wall with a hidden beam, designed for waterproof joints between the side wall and the bottom slab of a prefabricated subway station, according to an embodiment of the present invention.

[0038] Figure 4 This is a schematic diagram of a prefabricated subway station side wall-bottom slab waterproof joint cast-in-place bottom slab structure with hidden beams, provided by an embodiment of the present invention.

[0039] Figure 5 This is a schematic diagram of a concealed beam structure for a waterproof joint between the side wall and bottom slab of a prefabricated subway station with concealed beams, provided in an embodiment of the present invention.

[0040] Figure 6 This is a schematic diagram of the flexible waterproof strip assembly of a prefabricated subway station side wall-bottom slab waterproof joint with a hidden beam, provided by an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of the assembly of a prefabricated side wall with a hidden beam and a cast-in-place base slab for a prefabricated subway station side wall-base slab with waterproof joint, according to an embodiment of the present invention.

[0042] Figure 8 This is a schematic diagram of a grouting sleeve connection for a waterproof joint between the side wall and bottom slab of a prefabricated subway station with a hidden beam, provided in an embodiment of the present invention.

[0043] In the diagram, 1. Precast side wall, 11. Inner leaf plate, 12. Outer leaf plate, 13. Inner steel mesh, 14. Outer steel mesh, 15. Tie bar, 16. Truss reinforcement, 2. Cast-in-place base slab, 21. Reinforcement joint, 22. Reserved groove, 23. Waterproof groove, 3. Grouting sleeve, 31. Connecting thread, 32. Grout outlet pipe, 33. Injection pipe, 34. Grouting area, 4. Hidden beam, 41. Longitudinal reinforcement, 42. Stirrup, 5. Flexible waterproof strip. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0045] To address the current problems of long construction cycles, poor joint waterproofing, and excessive mold consumption in subway station construction, this invention provides a prefabricated waterproof joint for the side wall and bottom slab of a subway station with a hidden beam.

[0046] This design scheme avoids the need for extensive formwork during construction by using two prefabricated wall panels, inner leaf 11 and outer leaf 12. A pre-reserved groove 22 is provided on the cast-in-place base slab 2. Waterproof grooves 22 and steel bar joints 21 are respectively provided on the cast-in-place base slab 2 on both sides of the pre-reserved groove 22. The inner leaf 11 with grouting sleeve 3 is connected to the cast-in-place base slab 2 on the side with steel bar joint 21. The outer leaf 12 with flexible waterproof strip 5 is connected to the cast-in-place base slab 2 on the side with waterproof groove 23.

[0047] Meanwhile, a central cavity is formed between the inner leaf plate 11 and the outer leaf plate 12. The central cavity and the reserved groove 22 form a pouring area. After pouring, the concrete in the pouring area and the precast side wall 1 together form a tenon structure. The tenon structure is embedded in the cast-in-place base plate 2 to form a stable waterproof structure.

[0048] The tenon structure formed by casting has a certain degree of freedom. A flexible waterproof strip 5 is installed at the joint between the outer leaf plate 12 and the cast-in-place base plate 2. The flexible waterproof strip 5 is embedded and connected to the waterproof groove 23, and self-compacts under soil pressure, achieving good waterproof performance. To further illustrate the structure of this invention, a detailed description is provided below in conjunction with the accompanying drawings:

[0049] like Figure 1 As shown, this embodiment of the invention discloses a prefabricated subway station side wall-bottom slab waterproof joint with a hidden beam, including a prefabricated side wall 1, a cast-in-place bottom slab 2, a grouting sleeve 3, a hidden beam 4, and a flexible waterproof strip 5;

[0050] A horizontal and straight reserved groove 22 is provided on the cast-in-place base slab 2. A row of steel bar joints 21 is provided on one side along the length of the reserved groove 22, and a waterproof groove 23 is provided on the other side.

[0051] The prefabricated side wall 1 includes an inner leaf plate 11 and an outer leaf plate 12 arranged parallel to each other. A truss steel bar 16 is provided between the inner leaf plate 11 and the outer leaf plate 12 to connect and fix the inner leaf plate 11 and the outer leaf plate 12 so that the inner leaf plate 11 and the outer leaf plate 12 form a whole.

[0052] The inner leaf plate 11 and the outer leaf plate 12 are respectively connected to both sides of the pre-reserved groove 22 on the cast-in-place base plate 2;

[0053] The inner leaf plate 11 is connected to the side of the cast-in-place base plate 2 where the steel bar joint 21 is provided. A row of grouting sleeves 3 is vertically provided on the inner bottom side of the inner leaf plate 11. A row of steel bar joints 21 is embedded in a row of grouting sleeves 3, thereby connecting the inner leaf plate 11 to the cast-in-place base plate 2. An inner steel bar mesh 13 is provided inside the inner leaf plate 11.

[0054] like Figure 2 , Figure 6 As shown, the outer leaf plate 12 is connected to the side of the cast-in-place base plate 2 where a waterproof groove 23 is provided. A flexible waterproof strip 5 is integrally formed on the outer bottom side of the outer leaf plate 12. The lower end of the flexible waterproof strip 5 is embedded in the waterproof groove and cooperates with the waterproof groove 23 to improve the waterproof performance of the joint. The outer leaf plate 12 and the cast-in-place base plate 2 are connected to the waterproof groove 23 through the flexible waterproof strip 5. An outer steel mesh is provided inside the outer leaf plate 12.

[0055] like Figure 3 As shown, the truss reinforcement 16 is used to connect the inner leaf plate 11 and the outer leaf plate 12 to improve the connection stiffness between the inner leaf plate 11 and the outer leaf plate 12. The truss reinforcement 16 is located between the inner leaf plate 11 and the outer leaf plate 12. One side of it extends into the interior of the inner leaf plate 11 and is connected to the inner reinforcement mesh 13, and the other side extends into the interior of the outer leaf plate 12 and is connected to the outer reinforcement mesh 14.

[0056] The reserved groove 22 is used to accommodate the hidden beam 4, and the height of the hidden beam 4 is greater than the depth of the reserved groove 22.

[0057] After the inner leaf plate 11 and the outer leaf plate 12 are installed with the cast-in-place base plate 2, a central cavity is formed between the inner leaf plate 11 and the outer leaf plate 12. The central cavity and the reserved groove 22 form a pouring area. After pouring, the concrete in the pouring area and the precast side wall 1 together form a tenon structure embedded in the cast-in-place base plate 2.

[0058] like Figure 2 , Figure 3 , Figure 5 As shown, multiple parallel tie bars 15 are provided at the lower end between the inner leaf plate 11 and the outer leaf plate 12. The tie bars 15 are located at the lower end of the central cavity between the inner leaf plate 11 and the outer leaf plate 12. The multiple tie bars pass through the hidden beam so that the hidden beam forms an integral whole with the inner leaf plate 11 and the outer leaf plate 12.

[0059] The upper part of the flexible waterproof strip 5 is prefabricated integrally with the outer leaf plate 12, and the lower part of the flexible waterproof strip 5 is embedded and connected to the waterproof groove 23. The flexible waterproof strip 5 is arranged longitudinally along the outer leaf plate 12, with a longitudinal length of 3m, a height of 50mm, and a transverse width of not less than 40mm. The flexible waterproof strip 5 includes upper, middle, and lower parts from top to bottom.

[0060] The upper part is pre-embedded to the bottom of the outer leaf plate 12 at a depth of 20mm. The lower 20mm part is embedded in the waterproof groove 23 of the cast-in-place base slab 2. The middle part is 10mm in diameter. Grooves are set on both sides of the middle part along the length of the waterproof groove 23. After the flexible waterproof strip 5 is compacted, it is ensured that there is sufficient expansion space on both sides of the flexible waterproof strip 5 under the compaction action, so that the joint between the flexible waterproof strip 5 and the waterproof groove 23 is tight. The cross-sectional dimensions of the waterproof groove 23 are 40mm×20mm, the width is 40mm, and the depth is 20mm. Since the waterproof groove 23 is embedded and connected to the flexible waterproof strip 5, the length of the waterproof groove 23 does not exceed 3 meters.

[0061] like Figure 8 As shown, the grouting sleeve 3 has an open bottom and a hollow interior. It is installed at the bottom of the vertical steel bar of the inner steel mesh 13 and is built into the inner leaf plate 11. The bottom of the vertical steel bar is provided with an external thread, and the upper end of the grouting sleeve 3 is provided with a corresponding internal thread. The grouting sleeve 3 is threadedly connected to the bottom of the vertical steel bar.

[0062] The grouting sleeve 3 is designed in such a way that the connection between the grouting sleeve 3 and the inner leaf plate 11 is more secure. The steel bar joint 21 on the cast-in-place base plate 2 is embedded inside the grouting sleeve 3, which makes the connection between the inner leaf plate 11 and the cast-in-place base plate 2 more stable.

[0063] Specifically, the grouting sleeve 3 includes a connecting thread 31 at the upper end, a grout outlet pipe 32 and a grout injection pipe 33 arranged horizontally on the side, and a hollow grouting zone 34 inside. The grout outlet pipe 32 and the grout injection pipe 33 are connected to the grouting zone 34, and the ends of the grout outlet pipe 32 and the grout injection pipe 33 away from the cylinder body of the grouting sleeve 3 are flush with the surface of the inner leaf plate 11. The upper end of the grouting sleeve 3 is threadedly connected to the bottom of the longitudinal reinforcing bars of the inner steel mesh 13 through the thread 31. During installation, the reinforcing bar joint 21 on the cast-in-place base slab 2 extends into the grouting zone 34 from the lower opening of the grouting sleeve 3. After installation, grout is injected into the grout injection pipe 32. When the grout flows out from the grout outlet pipe 33, it indicates that the grout in the grouting zone 34 is dense. Grouting is then stopped, and the grout injection pipe 32 and the grout outlet pipe 33 are sealed with rubber plugs.

[0064] like Figure 7 As shown, the hidden beam 4 includes longitudinally arranged longitudinal bars 41 and multiple stirrups 42 arranged sequentially along the length of the longitudinal bars. The longitudinal bars include four bars, and the four longitudinal bars 41 are arranged parallel to each other. Two bars are arranged parallel to each other and located at the top, and two bars are arranged parallel to each other and located at the bottom. The stirrups 42 are square structures, and multiple stirrups 42 are arranged sequentially along the length of the longitudinal bars 41. The four corners of the stirrups 42 are welded and fixed to the four longitudinal bars 41 respectively.

[0065] The flexible waterproof strip 5 is made of rubber or polyurethane resin. Under soil pressure, the flexible waterproof strip 5 on the outer leaf plate 12 is pressed into the waterproof groove, which can prevent water from seeping into the pouring area.

[0066] The tie bar 15 includes multiple bars, which are arranged horizontally and parallel to each other. They are located at the lower end of the cavity between the inner leaf plate 11 and the outer leaf plate 12, and their two ends are connected to the inner steel mesh 13 and the outer steel mesh 14 respectively. The multiple tie bars 15 pass through the two longitudinal bars 41 at the upper end of the hidden beam 4, so that the hidden beam 4 is connected with the inner leaf plate 11 and the outer leaf plate 12 as a whole.

[0067] like Figure 4 As shown, the height of the joint surface of the cast-in-place base slab 2 is greater than 1 / 3 of the height of the station's ground floor (not shown in the figure). Figure 4 H in the figure represents the height of the cast-in-place base plate joint, so as to ensure that the connection between the grouting sleeve 3 of the inner leaf plate 11 and the steel bar joint 21 can effectively resist tensile stress under the action of soil pressure, and the lower part of the flexible waterproof strip 5 on the outer leaf plate 12 is pressed into the waterproof groove 23 by itself under the action of compressive stress; and the height of the cast-in-place base plate 2 is less than 2m, so as to avoid a large amount of formwork on site.

[0068] Under the action of lateral earth pressure, the cast-in-place base slab 2 will displace along the direction of force. The cast-in-place base slab 2 is regarded as a rigid frame subjected to uniformly distributed load. The middle part of the cast-in-place base slab 2 will deflect along the direction of force, which will cause tensile stress to be generated on the inner side of the section of the cast-in-place base slab 21 and compressive stress to be generated on the outer side. By calculating the load of the subway station, its bending moment diagram is determined. Assuming that the height of the bottom floor of the station (the height from the bottom floor slab to the top floor slab) is h, it is found that the tension area on the inner side is at least between h / 3 and 2h / 3. Therefore, the joint height of the cast-in-place base slab 2 should be guaranteed to be 1 / 3 of the bottom floor height.

[0069] The inner steel mesh 13 is distributed throughout the inner leaf plate 11, and the outer steel mesh 14 is distributed throughout the outer leaf plate 12, thereby enhancing the rigidity of the inner leaf plate 11 and the outer leaf plate 12.

[0070] A construction process for a waterproof joint between the side wall and base slab of a prefabricated subway station with concealed beams includes the following steps:

[0071] S1. Precast side walls and cast-in-place base slabs 2 are precast separately;

[0072] When casting the cast-in-place base slab 2, a reserved groove is provided on the cast-in-place base slab 2, and a steel bar joint and a waterproof groove are respectively provided on both sides along the length of the reserved groove.

[0073] When pouring the precast sidewall, a grouting sleeve is installed at the bottom of the inner leaf plate, and a flexible waterproof strip is integrally formed at the bottom of the outer leaf plate. The inner leaf plate and the outer leaf plate are fixed with truss steel bars. In addition, tie bars are connected between the inner leaf plate and the outer leaf plate. The tie bars pass through the hidden beam so that the hidden beam, the inner leaf plate, and the outer leaf plate form a whole.

[0074] S2. Connect the inner leaf plate with the grouting sleeve to the cast-in-place base plate 2 with the steel bar joint on the corresponding side. Connect the outer leaf plate with the flexible waterproof strip in one piece to the cast-in-place base plate 2 with the waterproof groove on the corresponding side. Place the hidden beam in the reserved groove on the cast-in-place base plate 2, and the height of the hidden beam is greater than the depth of the reserved groove.

[0075] S3. After the steel bar joint on the cast-in-place base slab 2 is embedded in the grouting sleeve, grout is injected into the grouting sleeve through the grouting pipe to further tighten the connection between the inner leaf plate and the cast-in-place base slab 2. After the grout outlet pipe produces grout, the grouting pipe and the grout outlet pipe are sealed respectively.

[0076] S4. A central cavity is formed between the inner leaf plate and the outer leaf plate. The central cavity and the reserved groove form a pouring area. After pouring, the concrete in the pouring area and the precast side wall together form a tenon structure. The tenon structure is embedded in the cast-in-place base plate 2 to form a stable waterproof structure.

[0077] like Figure 7As shown, after the precast sidewall 1 and the cast-in-place base slab 2 are installed, the cavity in the middle of the precast sidewall 1 and the reserved groove 22 of the cast-in-place base slab 2 form a pouring area. The concrete poured in the pouring area forms a tenon structure with the precast sidewall 1. The tenon structure is embedded in the cast-in-place base slab 2 to form a stable structure. Furthermore, the flexible waterproof strip 5 of the outer leaf plate 12 on the outer side of the precast sidewall 1 is self-compacted under compressive stress, ensuring the waterproof performance of the joint. The inner leaf plate 11 on the inner side of the precast sidewall 1 is provided with a grouting sleeve 3 and connected to the steel bar joint 21 on the cast-in-place base slab 2. After the inner leaf plate 11 is connected to the cast-in-place base slab 2, grouting is performed on the grouting area 34 at the connection between the grouting pipe 3 and the steel bar joint 21 through the grouting pipe 33 on the grouting pipe 3, making the connection between the inner leaf plate 11 and the cast-in-place base slab 2 more stable.

[0078] The connection between the precast side wall 1 and the cast-in-place base slab 2 is a semi-rigid connection, which has a certain degree of freedom under earth pressure, allowing the flexible waterproof strip 5 to be compacted by itself under earth pressure.

[0079] In the actual installation process, the precast side wall 1 and the cast-in-place base slab 2 are precast, then the precast side wall 1 and the cast-in-place base slab 2 are connected, then the grouting pipe 3 is grouted and sealed, and finally the middle cavity and the reserved groove 22 between the inner leaf plate 11 and the outer leaf plate 12 are grouted.

[0080] The specific manufacturing process of precast sidewall 1 is as follows:

[0081] S1. Binding the steel reinforcement frame of the precast side wall 1; including binding the inner steel mesh 13 and the outer steel mesh 14, and binding both sides of the truss steel bars 16 to the inner steel mesh 13 and the outer steel mesh 14 respectively, and also including passing tie bars 15 through the hidden beam 4 so that the hidden beam 4 is connected to the inner steel mesh 13 and the outer steel mesh 14 of the precast side wall 1, and a row of grouting sleeves 3 are threaded to the bottom of the vertical steel bars of the inner steel mesh 13.

[0082] S2. Clean and mark the formwork of precast side wall 1 to determine the position of the formwork and the precast side wall 1.

[0083] S3. Place the steel reinforcement frame of the precast side wall 1 into the mold, and arrange the protective layer plastic blocks at the bottom in a quincunx pattern. The height of the blocks should be the same as the thickness of the concrete protective layer. Place a flexible waterproof strip 5 at the bottom of the outer steel mesh 14. After pouring, the upper part of the flexible waterproof strip 5 should be left inside the outer leaf plate 12.

[0084] S4. During the casting stage, the inner leaf plate is cast first. Since the inner leaf plate includes the wall and the corbel, it is important to control the mold during casting. Place the wall part template on the mold table, and let the corbel part template hang out of the mold table and apply support below to ensure that the casting surface is horizontal.

[0085] S5. After pouring, before the concrete reaches the initial setting state, roughen the overlapping surface. The difference in the unevenness of the rough surface should not be less than 4mm.

[0086] S6. After the concrete has solidified and cured, remove the inner leaf slab formwork.

[0087] S7. Flip the plate and pour the outer leaf plate;

[0088] S8. After the curing is completed, remove the outer leaf plate formwork and repair any minor damage to the components that does not affect the structural performance.

[0089] Furthermore, the specific installation steps for the precast sidewall 1 and the cast-in-place base slab 2 are as follows:

[0090] S1. The precast side wall is transported to the construction site after it is manufactured in the component factory. It is hoisted after the cast-in-place base slab 2 is poured and cured. In order to prevent grout leakage at the joint during the subsequent grouting of the sleeve, caulking strips are placed on the plane inside and outside the steel bar joint before hoisting the side wall.

[0091] S2. Hoist the precast side wall to 1m from the working surface and stop lowering. Then, the operator guides the descent by hand. Place a small mirror on the protruding surface of the rebar joint of the cast-in-place base slab 2 to observe whether the grouting sleeve and the rebar joint are properly connected. If they are not properly connected, the rebar joint needs to be corrected in time.

[0092] S3. After the connection is in place, slowly lower it to the joint surface of the cast-in-place base slab 2 and stop. Use diagonal supports to correct the side wall surface.

[0093] S4. Install other prefabricated sidewalls according to the above plan;

[0094] S5. Grouting is carried out on the grouting sleeve. The grouting material is injected from the grouting pipe. Grouting is stopped when the grout flows out from the grout outlet pipe. The grouting pipe and the grout outlet pipe are then sealed with rubber stoppers.

[0095] S6. After the grouting sleeve reaches the required strength, the cavity in the middle of the precast side wall and the reserved groove on the cast-in-place base slab 2 form a pouring area. Concrete is poured into this area, and the concrete in the pouring area and the precast side wall together form a tenon structure. The tenon structure is embedded into the cast-in-place base slab 2 to form a stable waterproof structure. After pouring, curing is carried out.

[0096] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An assembled subway station side wall-floor waterproof type joint with a hidden beam, characterized in that, Comprising The cast-in-place bottom plate is provided with a horizontal and straight reserved groove, and a row of steel joints is arranged on one side of the length direction of the reserved groove, and a waterproof groove is arranged on the other side; The prefabricated side wall comprises: The inner leaf plate is connected with the side of the cast-in-place bottom plate provided with the steel joint, the bottom inner side of the inner leaf plate is vertically provided with a row of grouting sleeves, a row of the grouting sleeves is open at the lower end and hollow inside, a row of the steel joints is embedded into a row of the grouting sleeves, so that the inner leaf plate is rigidly connected with the cast-in-place bottom plate, and the inner leaf plate is provided with an inner steel mesh; The outer leaf plate is connected with the side of the cast-in-place bottom plate provided with the waterproof groove, the outer leaf plate is integrally formed with a flexible waterproof strip at the bottom outer side, the lower end of the flexible waterproof strip is embedded into the waterproof groove, so that the outer leaf plate is flexibly and sealingly connected with the cast-in-place bottom plate, and the outer leaf plate is provided with an outer steel mesh; The truss steel is used for connecting the inner leaf plate and the outer leaf plate, so as to improve the connection rigidity of the inner leaf plate and the outer leaf plate, the truss steel is located between the inner leaf plate and the outer leaf plate, one side of the truss steel extends into the inner leaf plate and is connected with the inner steel mesh, and the other side of the truss steel extends into the outer leaf plate and is connected with the outer steel mesh; The height value of the hidden beam is greater than the depth value of the reserved groove, and the hidden beam is placed in the reserved groove; The middle cavity is formed between the inner leaf plate and the outer leaf plate, the middle cavity and the reserved groove form a pouring area, and after pouring, the concrete of the pouring area and the prefabricated side wall jointly form a tenon structure embedded into the cast-in-place bottom plate.

2. The dry beam equipped fabricated metro station side wall-slab waterproof type node according to claim 1, characterized in that, The middle part of the flexible waterproof strip is provided with grooves on both sides, and after compaction, sufficient expansion space is left on both sides of the flexible waterproof strip, so that the joint between the waterproof groove and the flexible waterproof strip is tightly spliced.

3. The dry beam equipped fabricated metro station side wall-slab waterproof type node according to claim 1, characterized in that, A plurality of tie bars are horizontally and parallel arranged between the inner leaf plate and the outer leaf plate, one end of the tie bar is connected with the inner steel mesh in the inner leaf plate, the other end of the tie bar is connected with the outer steel mesh of the outer leaf plate, the tie bar passes through the hidden beam, so that the hidden beam, the inner leaf plate and the outer leaf plate form an integral whole.

4. The dry beam equipped fabricated metro station side wall-slab waterproof type node according to claim 1, characterized in that, The upper end of the grouting sleeve is threadedly connected with the bottom of the vertical steel of the inner steel mesh and is built-in in the inner leaf plate, and the grouting sleeve is respectively and continuously provided with a grout outlet pipe and a grouting pipe on one side, and the ends of the grout outlet pipe and the grouting pipe away from the grouting sleeve are flush with the outer surface of the inner leaf plate.

5. The dry beam equipped fabricated metro station side wall-slab waterproof type node according to claim 1, characterized in that, The hidden beam comprises longitudinal reinforcement and stirrups arranged along the length direction of the longitudinal reinforcement.

6. The dry beam equipped fabricated metro station side wall-slab waterproof type node according to claim 1, characterized in that, The flexible waterproof strip is made of rubber or polyurethane resin material.

7. The dry beam equipped fabricated metro station side wall-slab waterproof type node according to claim 1, characterized in that, The joint height of the cast-in-place bottom plate is greater than 1 / 3 of the floor height of the station, and the height of the cast-in-place bottom plate is less than 2m.

8. The dry beam assembled subway station side wall-slab waterproof type node according to any one of claims 1-7, characterized in that, The inner steel mesh is arranged in the inner leaf plate, and the outer steel mesh is arranged in the outer leaf plate.

9. A construction process of a waterproof type node of an assembled subway station side wall-floor with a hidden beam, based on the waterproof type node of the assembled subway station side wall-floor with a hidden beam according to claim 8, characterized in that, The method comprises the following steps: S1, prefabricate the prefabricated side wall and the cast-in-place bottom plate respectively; When pouring the cast-in-place bottom plate, the reserved groove is arranged on the cast-in-place bottom plate, and the steel joint and the waterproof groove are arranged on both sides of the length direction of the reserved groove respectively; When pouring the prefabricated side wall, a grouting sleeve is arranged at the bottom of the inner leaf plate, a flexible waterproof strip is integrally formed at the bottom of the outer leaf plate, the inner leaf plate and the outer leaf plate are fixed by using truss steel bars, in addition, a tie bar is connected between the inner leaf plate and the outer leaf plate, the tie bar passes through the hidden beam, so that the hidden beam, the inner leaf plate and the outer leaf plate form an integral whole; S2, the inner leaf plate provided with the grouting sleeve is connected with the cast-in-place bottom plate provided with the steel bar joint, the outer leaf plate integrally provided with the flexible waterproof strip is connected with the cast-in-place bottom plate provided with the waterproof groove, the hidden beam is placed in the reserved groove on the cast-in-place bottom plate, and the height value of the hidden beam is greater than the depth value of the reserved groove; S3, after the steel bar joint on the cast-in-place bottom plate is embedded in the grouting sleeve, grouting is performed in the grouting sleeve through the grouting pipe, so that the connection between the inner leaf plate and the cast-in-place bottom plate is further fastened, after grouting is completed, the grouting pipe and the grouting pipe are sealed respectively; S4, there is a middle cavity between the inner leaf plate and the outer leaf plate, the middle cavity and the reserved groove form a pouring area, after pouring, the concrete of the pouring area and the prefabricated side wall jointly form a tenon structure, the tenon structure is embedded in the cast-in-place bottom plate, and a stable waterproof structure is formed.

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