Superimposed side wall system for underground station and construction method of superimposed side wall system

Abstract

The invention relates to the technical field of assembly type building engineering, in particular to a laminated side wall system for an underground station and a construction method of the laminated side wall system, the laminated side wall system comprises a single-face laminated side wall and a double-face laminated side wall, and the single-face laminated side wall or the double-face laminated side wall is selected for construction according to different construction conditions. The single-face laminated side wall is composed of an inner side prefabricated reinforced concrete laminated plate I and a cast-in-place layer I. The double-face laminated side wall is composed of an inner side prefabricated reinforced concrete laminated plate II, an outer side prefabricated reinforced concrete laminated plate and a cast-in-place layer II. When the underground diaphragm wall needs to be adopted for foundation pit supporting, the single-face overlapped side wall is adopted; when the underground diaphragm wall is not needed for foundation pit supporting, the double-face overlapped side wall is adopted. The superimposed side wall system for the underground station and the construction method thereof have the advantages of being high in adaptability, high in construction efficiency, good in connection performance, low in construction cost, convenient to transport and assemble, good in waterproof effect and the like, and are particularly suitable for the field of fabricated building engineering such as the underground station.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated building engineering, and particularly relates to a composite side wall system for an underground station and a construction method thereof. Background Art

[0002] In the traditional construction mode, building materials are wasted seriously, water resources and energy are consumed greatly, and at the same time, the labor demand is also very large. The dirty, messy and poor construction site not only affects the beauty of the city, but also becomes a pollution source. In order to cope with the current situation of rising labor costs, resource shortages and insufficient labor population, and at the same time meet the strategic requirements of energy conservation, environmental protection and sustainable development in China.

[0003] In the central urban area, urban rail transit is mainly subway. As a key node in the process of rail transit construction, the construction speed and quality of subway stations are crucial. There are many problems in the traditional in-situ casting station construction method, such as long construction period, difficult quality control, etc. Therefore, using prefabrication technology to solve these problems and improve the construction speed and engineering quality of subway stations has become a reasonable choice.

[0004] However, the existing prefabricated structures are mostly used in above-ground buildings, and a large number of sleeve connections are required. The installation process is complex and difficult, and at the same time, the grouting quality of the connection is difficult to guarantee. In addition, the standardization degree of the existing prefabricated structures is relatively low, and it is difficult to meet the special requirements of underground station construction.

[0005] In view of the above problems, the present invention proposes a composite side wall system for an underground station and a construction method thereof, aiming to provide a composite side wall construction scheme with good applicability that can be selected according to different construction conditions, so as to improve the construction efficiency and quality of subway stations, and at the same time reduce the construction cost. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a composite side wall system for an underground station and a construction method thereof. The composite side wall system for an underground station and the construction method thereof have multiple advantages such as strong adaptability, high construction efficiency, good connection performance, low construction cost, convenient transportation and assembly, and good waterproof effect, and are particularly suitable for the field of prefabricated building engineering such as underground stations.

[0007] The technical solution of the present invention is as follows:

[0008] The composite side wall system for underground stations includes two forms: single-sided composite side wall and double-sided composite side wall. The single-sided composite side wall consists of an inner precast reinforced concrete composite slab I and a cast-in-place layer I. The cast-in-place layer I includes a cast-in-place side wall I and a cast-in-place bottom slab I. The double-sided composite side wall consists of an inner precast reinforced concrete composite slab II, an outer precast reinforced concrete composite slab, and a cast-in-place layer II. The cast-in-place layer II includes a cast-in-place side wall II and a cast-in-place bottom slab II. The cast-in-place side wall II is arranged in the middle of the inner precast reinforced concrete composite slab II and the outer precast reinforced concrete composite slab. It can be flexibly selected according to different construction conditions, improving the construction efficiency and the overall performance of the side wall.

[0009] Truss bars I are arranged in the inner precast reinforced concrete composite slab I. Two lower chord bars of the truss bars I are embedded in the inner precast reinforced concrete composite slab I, and the upper chord bar of the truss bars I is arranged outside the inner precast reinforced concrete composite slab I.

[0010] Truss bars II are arranged in the inner precast reinforced concrete composite slab II and the outer precast reinforced concrete composite slab. Two lower chord bars of the truss bars II are embedded in the inner precast reinforced concrete composite slab II, and the upper chord bar of the truss bars II is embedded in the outer precast reinforced concrete composite slab.

[0011] By arranging truss bars in the precast reinforced concrete composite slab, the overall stiffness and load-bearing capacity of the composite slab are enhanced. At the same time, the embedded method of the truss bars is also convenient for connecting with the cast-in-place layer, improving the overall stability of the composite side wall.

[0012] Bottom slab extended longitudinal bars I are arranged in the cast-in-place bottom slab I, and side wall longitudinal bars I are arranged in the cast-in-place side wall I. The bottom slab extended longitudinal bars I and the side wall longitudinal bars I overlap within the range of the cast-in-place side wall I. Inner inserted bars I are arranged in the cast-in-place layer I. The upper part of the inner inserted bars I is closely attached to the inner precast reinforced concrete composite slab I, and the lower part of the inner inserted bars I extends to the core area of the cast-in-place bottom slab I.

[0013] Inner inserted bars II and outer inserted bars are arranged in the cast-in-place layer II. The upper parts of the inner inserted bars II and the outer inserted bars are respectively closely attached to the inner precast reinforced concrete composite slab II and the outer precast reinforced concrete composite slab, and the lower parts of the inner inserted bars II and the outer inserted bars extend to the core area of the cast-in-place bottom slab II.

[0014] The bottom slab extended longitudinal bars and side wall longitudinal bars arranged in the cast-in-place layer overlap within the range of the cast-in-place side wall, ensuring the effective connection between the cast-in-place layer and the precast composite slab. At the same time, the inner inserted bars (for single-sided composite side wall) and the inner inserted bars and outer inserted bars (for double-sided composite side wall) arranged in the cast-in-place layer further enhance the integrity and load-bearing capacity of the composite side wall.

[0015] A variable cross-section structure with a smaller cross-sectional dimension at the lower part than at the upper part is provided at the lower parts of the inner precast reinforced concrete composite slab I, the inner precast reinforced concrete composite slab II, and the outer precast reinforced concrete composite slab. The upper parts of the inner reinforcing bars I, the inner reinforcing bars II, and the outer reinforcing bars are respectively closely attached to the inside of the variable cross-section structures of the inner precast reinforced concrete composite slab I, the inner precast reinforced concrete composite slab II, and the outer precast reinforced concrete composite slab; the effective height of the reinforcing bars inserted into the cast-in-place composite layer is increased, thereby greatly improving the connection performance at the bottom of the side wall and enhancing the overall stability and durability of the composite side wall.

[0016] When casting the single-sided composite side wall, the surface where the inner precast reinforced concrete composite slab I is bonded to the cast-in-place layer I is roughened.

[0017] When casting the double-sided composite side wall, the surfaces where the inner precast reinforced concrete composite slab II and the outer precast reinforced concrete composite slab are bonded to the cast-in-place layer II are roughened; by roughening the surfaces where the precast reinforced concrete composite slab is bonded to the cast-in-place layer, the adhesion between the two is improved, making the composite side wall more stable when stressed and less likely to have problems such as peeling or cracking.

[0018] Horizontal distribution steel bars are provided in the cast-in-place side wall I and / or the cast-in-place side wall II; setting horizontal distribution steel bars in the cast-in-place side wall and jointly resisting shear with the truss bars improves the shear resistance and overall stability of the composite side wall.

[0019] A construction method for a composite side wall system for an underground station selects a single-sided composite side wall or a double-sided composite side wall structure according to different construction conditions; when it is necessary to use a diaphragm wall for foundation pit support, a single-sided composite side wall is adopted; when it is not necessary to use a diaphragm wall for foundation pit support, a double-sided composite side wall is adopted; this method can select a composite side wall structure plan with good applicability according to different construction conditions, thereby improving the construction efficiency and the overall performance of the side wall.

[0020] The inner precast single-sided composite slab and the double-sided composite slab are precast in a prefabrication factory, and the cast-in-place layer is poured on site; by precasting the inner precast single-sided composite slab and the double-sided composite slab in a prefabrication factory and pouring the cast-in-place layer on site, the industrialized production of the composite side wall and the on-site construction are organically combined, improving the construction efficiency and quality.

[0021] The construction process of the single-sided composite side wall includes the following steps:

[0022] S1: Support the formwork of the inner precast reinforced concrete composite slab I and arrange the steel bars, and embed the hoisting device.

[0023] S2: Embed the truss bar I.

[0024] S3: Pour the inner precast reinforced concrete composite slab I, and after the inner precast reinforced concrete composite slab I reaches the strength, transport it to the site.

[0025] S4: Support the formwork of the cast-in-place layer I, and arrange and bind the steel bars.

[0026] S5: Lift the inner precast reinforced concrete composite slab I into place, and bind the upper chord of the truss bar I with the horizontal distribution bars of the cast-in-place side wall I.

[0027] S6: Pour the concrete.

[0028] The construction process of the double-sided composite side wall includes the following steps:

[0029] S11: Support the formwork of the inner precast reinforced concrete composite slab II and arrange the steel bars, and embed the hoisting device.

[0030] S12: Embed the truss bar II, and embed the two lower chords of the truss bar II in the inner precast reinforced concrete composite slab II.

[0031] S13: Embed the ring-shaped hoisting steel bars at the same height as the truss bar II.

[0032] S14: After the inner precast reinforced concrete composite slab II reaches the strength, support the formwork of the outer precast reinforced concrete composite slab and arrange the steel bars in the slab.

[0033] S15: Lift the inner precast reinforced concrete composite slab II, turn it over and buckle it inside the outer precast reinforced concrete composite slab, and carry out the steel bar binding.

[0034] S16: Pour the concrete of the outer precast reinforced concrete composite slab.

[0035] S17: After the outer precast reinforced concrete composite slab reaches the strength, transport it to the site.

[0036] S18: Support part of the formwork of the cast-in-place layer II, and arrange and bind the steel bars.

[0037] S19: Lift the precast double-sided composite slab into place.

[0038] S20: Pour the concrete.

[0039] The beneficial effects of the present invention are as follows:

[0040] 1. The composite side wall system for underground stations and its construction method disclosed by the present invention can be flexibly selected according to different construction conditions. When the on-site site conditions are poor and diaphragm walls are required for foundation pit support, the single-sided composite side wall can be selected to reduce the technical requirements for on-site construction; while when the on-site site conditions are good and diaphragm walls are not required, the double-sided composite side wall can be selected to reduce the workload of on-site construction.

[0041] 2. The composite side wall system for an underground station and its construction method disclosed by the present invention use the indirect lap joint of inserted steel bars as the main connection method, and form the overall side wall through post-cast concrete; the construction process is simplified, the workload of on-site steel bar binding and concrete pouring is reduced, thus greatly improving the construction efficiency; at the same time, the precast reinforced concrete composite slab acts as the in-situ formwork, ensuring the verticality and facade flatness of the wall, and improving the construction quality.

[0042] 3. The composite side wall system for an underground station and its construction method disclosed by the present invention adopt a variable cross-section structure in the bottom connection area of the precast reinforced concrete composite slab, significantly increasing the effective height of the inserted steel bars in the in-situ composite layer, thus greatly improving the connection performance at the bottom of the side wall and enhancing the integrity and stability of the structure.

[0043] 4. The composite side wall system for an underground station and its construction method disclosed by the present invention do not set the out-of-slab steel bars or sleeves of the composite slab, but form an indirect lap joint between the inserted steel bars set in the in-situ layer and the steel bars of the composite slab. This connection method reduces the consumption of materials and labor, and reduces the construction cost; at the same time, the standardized production of precast components also reduces the production cost and improves the economic benefits.

[0044] 5. The composite side wall system for an underground station and its construction method disclosed by the present invention lift the precast reinforced concrete composite slab away from the maximum bending moment at the top of the axillary angle by setting an upturned opening, improving the overall waterproof effect and enhancing the durability of the structure. Brief Description of the Drawings

[0045] Figure 1 It is the front view of the single-sided composite side wall of the composite side wall system for an underground station according to the embodiment of the present invention;

[0046] Figure 2 It is the side view of the single-sided composite side wall of the composite side wall system for an underground station according to the embodiment of the present invention;

[0047] Figure 3 It is the top view of the single-sided composite side wall of the composite side wall system for an underground station according to the embodiment of the present invention;

[0048] Figure 4 It is the front view of the precast reinforced concrete composite slab of the single-sided composite side wall of the composite side wall system for an underground station according to the embodiment of the present invention;

[0049] Figure 5Cross-sectional view of the precast reinforced concrete laminated slab of the single-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0050] Figure 6 Schematic diagram of the reinforcement of the single-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0051] Figure 7 Cross-sectional view of the side wall of the single-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0052] Figure 8 Three-dimensional structure diagram of the single-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0053] Figure 9 Front view of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0054] Figure 10 Side view of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0055] Figure 11 Top view of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0056] Figure 12 Front view of the precast reinforced concrete laminated slab of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0057] Figure 13 Cross-sectional view of the precast reinforced concrete laminated slab of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0058] Figure 14 Schematic diagram of the reinforcement of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0059] Figure 15 Cross-sectional view of the side wall of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0060] Figure 16 Three-dimensional structure diagram of the double-sided laminated side wall of the laminated side wall system for an underground station according to an embodiment of the present invention;

[0061] The components represented by the reference numerals in the figure are:

[0062] The present invention: 1. Inner precast reinforced concrete composite slab I, 2. Cast-in-place side wall I, 3. Cast-in-place bottom slab I, 4. Truss bars I, 5. Extended longitudinal bars of the bottom slab I, 6. Longitudinal bars of the side wall I, 7. Inner inserted bars I;

[0063] 8. Inner precast reinforced concrete composite slab II, 9. Outer precast reinforced concrete composite slab, 10. Cast-in-place side wall II, 11. Cast-in-place bottom slab II, 12. Truss bars II, 13. Inner inserted bars II, 14. Outer inserted bars. Specific embodiments

[0064] The present invention will be further described in detail below in conjunction with the accompanying drawings through specific embodiments. Similar elements in different embodiments are labeled with related similar element numbers. In the following embodiments, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification to avoid overwhelming the core part of the present application with excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the descriptions in the specification and general technical knowledge in the art.

[0065] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is stated that a certain sequence must be followed.

[0066] Figure 1 , Figure 2 , Figure 3 and Figure 8 are respectively the front view, side view, top view, and three-dimensional view of the single-sided composite side wall of the composite side wall system for an underground station. The single-sided composite side wall of the composite side wall system for an underground station mainly includes precast partial components and a cast-in-place layer I, and the cast-in-place layer I includes a cast-in-place side wall I 2 and a cast-in-place bottom slab I 3.

[0067] Such as Figure 4As shown in the figure, the precast partial components include the inner precast reinforced concrete composite slab I 1 and the truss bar I 4. On the one hand, the truss bar I 4 increases the shear resistance of the side wall to ensure that there is enough strength to bear the vertical load. On the other hand, it increases the integrity of the inner precast reinforced concrete composite slab I 1 and the cast-in-place side wall I 2. In addition, in order to increase the integrity of the inner precast reinforced concrete composite slab I 1 and the cast-in-place side wall I 2, when casting the inner precast reinforced concrete composite slab I 1, the lapped surface and the lower end of the precast slab need to be roughened.

[0068] As Figure 6 and Figure 7 shown in the figure, the outer side of the single-sided composite side wall component is tied and lapped through the longitudinal bars I 5 extended from the bottom slab and the side wall longitudinal bars I 6 to achieve effective connection on the outer side; the inner side of the single-sided composite side wall component is indirectly lapped by closely attaching the inner inserted bars I 7 to the variable cross-section of the inner precast reinforced concrete composite slab I 1. All lapped bars are reinforced according to the principle of equal cross-sectional area with the longitudinal bars.

[0069] In this embodiment, the outer steel bars are 3 φ16 steel bars and 2 φ28 steel bars. The φ16 steel bars are continuous bars and also serve as the bottom bars of the bottom slab. The φ28 steel bars are adjusted according to the external force conditions on the outer side. The steel bars and inserted bars in the inner precast reinforced concrete composite slab I 1 are all 3 φ16 steel bars.

[0070] The inner precast reinforced concrete composite slab I 1 adopts a variable cross-section structure in the bottom connection area, thereby significantly increasing the effective height of the inserted bars in the cast-in-place composite layer and greatly improving the connection performance at the bottom of the side wall.

[0071] The inner precast reinforced concrete composite slab I 1 improves the adhesion between the post-cast concrete and the surface of the precast reinforced concrete composite slab by arranging truss bars and surface roughening treatment, making the precast reinforced concrete composite slab more firm and not easy to fall off.

[0072] Furthermore, the inserted bars in the cast-in-place layer are set according to the lap length required by the current specifications, and the principle of equal cross-sectional area reinforcement is adopted to form an indirect lap with the steel bars in the precast reinforced concrete composite slab to achieve effective connection of the steel bars.

[0073] Furthermore, the longitudinal bars in the wall panel are truncated to the height of the upturned opening to improve the overall waterproof effect and raise the precast reinforced concrete composite slab away from the maximum bending moment at the top of the axil angle.

[0074] Furthermore, the precast reinforced concrete composite slab reduces the cross-sectional width by the same length according to the lap length of the inserted bars.

[0075] Furthermore, the inner precast reinforced concrete composite slab I 1 needs to be embedded with a hoisting device according to the actual conditions.

[0076] The construction process of the single-sided laminated side wall of the laminated side wall system includes the construction processes in the prefabrication factory and on-site.

[0077] In the prefabrication factory, it includes the following steps:

[0078] S1: Support the formwork of the inner precast reinforced concrete laminated slab Ⅰ1 and arrange the steel bars, and embed the hoisting device according to the actual conditions;

[0079] S2: Embed the truss bars Ⅰ4, and embed the two lower chord bars of the truss bars Ⅰ4 in the inner precast reinforced concrete laminated slab Ⅰ1;

[0080] S3: After the inner precast reinforced concrete laminated slab Ⅰ1 reaches the strength, transport it to the site.

[0081] On-site, it includes the following steps:

[0082] S4: Support the formwork of the cast-in-place part and arrange the steel bars for steel bar binding;

[0083] S5: Hoist the inner precast reinforced concrete laminated slab Ⅰ1 in place and bind the upper chord bar of the truss bars Ⅰ4 with the horizontal distribution bars of the cast-in-place side wall;

[0084] S6: Pour the concrete for the remaining part.

[0085] Figure 9 、 Figure 10 、 Figure 11 and Figure 16 are respectively the front view, side view, top view and three-dimensional view of the double-sided laminated side wall for the underground station. The double-sided laminated side wall of the laminated side wall system for the underground station mainly includes the inner precast reinforced concrete laminated slab Ⅱ8, the outer precast reinforced concrete laminated slab 9, the cast-in-place side wall 10 and the cast-in-place bottom slab 11.

[0086] As Figure 12 shown, the precast part components include the inner precast reinforced concrete laminated slab Ⅱ8, the outer precast reinforced concrete laminated slab 9 and the truss bars Ⅱ12. The truss bars Ⅱ12 increase the shear resistance of the side wall on the one hand, ensuring sufficient strength to bear the vertical load, and on the other hand, increasing the integrity of the inner precast reinforced concrete laminated slab Ⅱ8, the outer precast reinforced concrete laminated slab 9 and the intermediate cast-in-place layer. In addition, in order to increase the integrity of the precast components and the cast-in-place layer, when pouring the inner precast reinforced concrete laminated slab Ⅱ8 and the outer precast reinforced concrete laminated slab 9, the lapped surface and the lower end of the precast slab need to be roughened.

[0087] As Figure 13 and Figure 14 shown, the double-sided laminated side wall realizes the indirect lap joint of the steel bars by the inner inserted bars Ⅱ13 and the outer inserted bars 14 protruding from the bottom slab and closely attaching to the precast two-side concrete variable-section laminated slab, and all the lapped steel bars are reinforced according to the principle of equal area with the longitudinal bars.

[0088] In this embodiment, the steel bars in the outer precast reinforced concrete composite slab are 3 φ16 steel bars and 2 φ28 steel bars. The inner and outer inserted bars Ⅰ7 are 5 steel bars with the same diameter, and the core area is bent and anchored according to the specified length. The steel bars and inserted bars in the inner precast composite slab are both 3 φ16 steel bars, and they are arranged in the same way.

[0089] Furthermore, the precast reinforced concrete composite slab of the double-sided composite side wall adopts a variable cross-section structure in the bottom connection area, which significantly increases the effective height of the inserted bars in the cast-in-place composite layer and greatly improves the connection performance at the bottom of the side wall.

[0090] The precast reinforced concrete composite slab improves the adhesion between the post-cast concrete and the surface of the precast reinforced concrete composite slab by arranging truss bars and surface roughening treatment, making the precast reinforced concrete composite slab more firm and not easy to fall off.

[0091] The inserted bars in the cast-in-place layer are set according to the lap length required by the current code, and the equal-area reinforcement principle is adopted to form an indirect lap with the steel bars in the precast reinforced concrete composite slab to achieve effective connection of the steel bars.

[0092] Furthermore, the double-sided composite side wall component includes two parts: two precast reinforced concrete composite slabs and a cast-in-place layer. The two lower chord bars of the truss bars are embedded in the inner precast reinforced concrete composite slab, and the upper chord bar is embedded in the outer precast reinforced concrete composite slab.

[0093] The cast-in-place layer Ⅱ includes two parts: the cast-in-place side wall Ⅱ10 and the cast-in-place bottom plate Ⅱ11. The wall plate part refers to the cast-in-place layer between and below the two precast reinforced concrete composite slabs. Inner and outer inserted bars are set in the cast-in-place layer. The inserted bars are close to the variable cross-section composite slabs on both sides and extend to the core area of the bottom plate. The two precast composite slabs, the cast-in-place wall plate and the cast-in-place bottom plate form an integral body through the post-cast concrete.

[0094] The precast reinforced concrete composite slab needs to embed a hoisting device according to the actual conditions. In particular, the precast reinforced concrete composite slab of the double-sided composite side wall needs to embed a ring-shaped hoisting steel bar at the same height as the truss bar to stabilize the precast reinforced concrete composite slab after turning over the slab.

[0095] The construction process of the double-sided composite side wall of the composite side wall system includes the construction processes in the precast factory and on-site.

[0096] The construction process in the precast factory includes the following steps:

[0097] S11: Support the formwork of the inner precast reinforced concrete composite slab Ⅱ8 and arrange the steel bars, and embed the hoisting device according to the actual conditions;

[0098] S12: Embed the truss bars II 12, and embed the two lower chord bars of the truss bars II 12 into the inner precast reinforced concrete composite slab II 8;

[0099] S13: Embed the ring-shaped hoisting bars at the same height as the truss bars II 12;

[0100] S14: After the inner precast reinforced concrete composite slab II 8 reaches the strength, support the formwork of the outer precast reinforced concrete composite slab 9 and arrange the steel bars in the slab;

[0101] S15: Hoist the inner precast reinforced concrete composite slab II 8, turn it over and buckle it into the outer precast reinforced concrete composite slab 9, and carry out steel bar binding.

[0102] S16: Pour the concrete of the outer precast reinforced concrete composite slab 9;

[0103] S17: After the precast reinforced concrete composite slab 9 reaches the strength, transport it to the site.

[0104] The on-site construction process includes the following steps:

[0105] S18: Support the formwork of the cast-in-place part, arrange the steel bars and carry out steel bar binding;

[0106] S19: Hoist the entire precast part in place;

[0107] S20: Pour the concrete of the remaining part.

[0108] The composite side wall system for underground stations provided by the present invention includes two types: single-sided composite side wall and double-sided composite side wall, and a composite side wall construction plan with good applicability can be selected according to different construction conditions. When the site conditions at the construction site are poor and diaphragm walls need to be used for foundation pit support, a single-sided composite side wall can be adopted to reduce the technical requirements for on-site construction; when the site conditions at the construction site are good and diaphragm walls are not required for foundation pit support, a double-sided composite side wall can be adopted to reduce the on-site construction workload.

[0109] The composite side wall system uses the indirect lap joint of inserted steel bars as the main connection method, and then pours the post-cast concrete to form the integral side wall. The precast reinforced concrete composite slab of the composite side wall system adopts a variable cross-section structure in the bottom connection area, so as to greatly improve the connection performance of the side wall bottom.

[0110] In the variable cross-section composite side wall member of the present invention, the inner and outer side walls utilize precast reinforced concrete composite slabs as in-situ formwork. The wall has good verticality and a flat facade, which can greatly improve the construction efficiency of subway stations, facilitate the inspection of assembly quality, and is convenient for transportation, having good economic effects. In addition, no reinforcing bars or sleeves are provided for the composite slabs. By setting inserted bars in the in-situ layer to form an indirect lap joint with the reinforcement bars of the composite slabs, the assembly efficiency is greatly improved and the construction cost is reduced.

[0111] Furthermore, by arranging truss bars in the precast reinforced concrete composite slabs and performing surface roughening treatment, the adhesion between the post-cast concrete and the precast components is enhanced, and the integrity and durability of the structure are improved. At the same time, the overall waterproof effect is improved by using the up-turned opening design. These innovative designs together constitute the unique advantages of the composite side wall system of the present invention.

[0112] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0113] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the technical field to which the present invention pertains, several simple deductions, deformations, or substitutions can be made based on the idea of the present invention.

Claims

1. A composite side wall system for underground stations, characterized in that: The invention comprises two types of single-sided composite side walls and double-sided composite side walls. The single-sided composite side wall is composed of an inner precast reinforced concrete composite slab I (1) and a cast-in-place layer I. The cast-in-place layer I comprises a cast-in-place side wall I (2) and a cast-in-place bottom plate I (3). The double-sided composite side wall is composed of an inner precast reinforced concrete composite slab II (8), an outer precast reinforced concrete composite slab (9) and a cast-in-place layer II. The cast-in-place layer II comprises a cast-in-place side wall II (10) and a cast-in-place bottom plate II (11). The cast-in-place side wall II (10) is arranged between the inner precast reinforced concrete composite slab II (8) and the outer precast reinforced concrete composite slab (9).

2. The composite side wall system for underground stations according to claim 1, characterized in that: The inner prefabricated reinforced concrete composite slab I (1) is provided with a truss bar I (4), two lower chords of the truss bar I (4) are pre-buried in the inner prefabricated reinforced concrete composite slab I (1), and the upper chord of the truss bar I (4) is arranged outside the inner prefabricated reinforced concrete composite slab I (1); Truss bars II (12) are arranged inside the inner precast reinforced concrete composite slab II (8) and the outer precast reinforced concrete composite slab (9), two lower chords of the truss bars II (12) are pre-buried in the inner precast reinforced concrete composite slab II (8), and the upper chord of the truss bars II (12) is pre-buried in the outer precast reinforced concrete composite slab (9).

3. The composite side wall system for underground stations according to claim 1, characterized in that: The cast-in-place bottom plate I (3) is provided with a bottom plate protruding longitudinal reinforcement I (5), the cast-in-place side wall I (2) is provided with a side wall longitudinal reinforcement I (6), the bottom plate protruding longitudinal reinforcement I (5) and the side wall longitudinal reinforcement I (6) are overlapped within the cast-in-place side wall I (2), an inner dowel reinforcement I (7) is provided in the cast-in-place layer I, the upper part of the inner dowel reinforcement I (7) is closely attached to the inner precast reinforced concrete composite slab I (1), and the lower part of the inner dowel reinforcement I (7) is extended to the core area of ​​the cast-in-place bottom plate I (3); In the cast-in-place layer II, inner dowel bars II (13) and outer dowel bars (14) are arranged. The upper parts of the inner dowel bars II (13) and the outer dowel bars (14) are respectively closely attached to the inner precast reinforced concrete composite slab II (8) and the outer precast reinforced concrete composite slab (9), and the lower parts of the inner dowel bars II (13) and the outer dowel bars (14) are extended to the core area of ​​the cast-in-place bottom slab II (11).

4. The composite side wall system for underground stations according to claim 3, characterized in that: A variable cross-section structure having a cross-section dimension smaller than that of an upper section is provided at the lower portion of the inner precast reinforced concrete composite slab I (1), the inner precast reinforced concrete composite slab II (8) and the outer precast reinforced concrete composite slab (9), and the upper portions of the inner dowel bars I (7), the inner dowel bars II (13) and the outer dowel bars (14) are respectively closely attached to the inside of the variable cross-section structure of the inner precast reinforced concrete composite slab I (1), the inner precast reinforced concrete composite slab II (8) and the outer precast reinforced concrete composite slab (9).

5. The composite side wall system for underground stations according to claim 1, characterized in that: When casting the single-sided composite side wall, the surface where the inner prefabricated reinforced concrete composite slab I (1) is bonded to the cast-in-place layer I is roughened; When casting the double-sided composite side wall, the surfaces where the inner prefabricated reinforced concrete composite slab II (8) and the outer prefabricated reinforced concrete composite slab (9) are bonded to the cast-in-place layer II are roughened.

6. The composite side wall system for underground stations according to claim 1, characterized in that: Horizontal distribution steel bars are arranged in the cast-in-place side wall I (2) and / or the cast-in-place side wall II (10).

7. A construction method for a composite side wall system for an underground station, characterized in that: Select single-sided composite side wall or double-sided composite side wall structure according to different construction conditions; when underground continuous wall is required for foundation pit support, single-sided composite side wall is used; when underground continuous wall is not required for foundation pit support, double-sided composite side wall is used.

8. The construction method of the composite side wall system for underground stations as claimed in claim 7, characterized in that: The inner prefabricated single-sided composite slab and double-sided composite slab are prefabricated in the prefabrication plant, and the cast-in-place layer is poured on site.

9. The construction method of the composite side wall system for underground stations as claimed in claim 8, characterized in that: The construction process of the single-sided composite side wall includes the following steps: S1: Support the inner precast reinforced concrete composite slab Ⅰ(1) formwork and arrange the reinforcement, and embed the lifting device; S2: embedded truss reinforcement I (4); S3: Cast the inner precast reinforced concrete composite slab I (1), and transport the inner precast reinforced concrete composite slab I (1) to the site after the inner precast reinforced concrete composite slab I (1) reaches a certain strength; S4: Support the cast-in-place layer I formwork, arrange the steel bars and tie them; S5: hoist the inner precast reinforced concrete composite slab Ⅰ(1) into place, and tie the upper chord of the truss reinforcement Ⅰ(4) to the horizontal distribution reinforcement of the cast-in-place side wall Ⅰ(2); S6: pouring concrete.

10. The construction method of the composite side wall system for underground stations as claimed in claim 8, characterized in that: The construction process of the double-sided superimposed side wall comprises the following steps: S11: Support the inner prefabricated reinforced concrete composite slab II (8) formwork and arrange the steel bars, and embed the lifting device; S12: pre-embedded truss reinforcement II (12), the two lower chords of the truss reinforcement II (12) are pre-embedded in the inner prefabricated reinforced concrete composite slab II (8); S13: pre-embedded annular lifting reinforcement at the same height as truss reinforcement II (12); S14: After the inner precast reinforced concrete composite slab II (8) reaches a certain strength, the formwork of the outer precast reinforced concrete composite slab (9) is supported and the steel bars in the slab are arranged; S15: hoist the inner prefabricated reinforced concrete composite slab II (8), turn the slab over and press it into the outer prefabricated reinforced concrete composite slab (9), and tie the reinforcement bars; S16: pouring concrete of the outer precast reinforced concrete composite slab (9); S17: After the outer prefabricated reinforced concrete composite slab (9) reaches the required strength, it is transported to the site; S18: Support part of the formwork of cast-in-place layer II, arrange the steel bars and tie them; S19: hoist the prefabricated double-sided composite panels into place; S20: pouring concrete.

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