Bearing structure

Abstract

The utility model provides a bearing structure which comprises a cast-in-place bottom plate and a prefabricated laminated side wall, and a plurality of first connecting steel bars and a plurality of second connecting steel bars are arranged on the top faces of the two ends of the cast-in-place bottom plate at intervals in the transverse direction. A cavity and a grouting hole are formed in the prefabricated laminated side wall, the bottom surface of the prefabricated laminated side wall is arranged on the top surface of the end part of the cast-in-place bottom plate, the first connecting steel bar is inserted into the cavity, and the second connecting steel bar is inserted into the grouting hole; the cavities and the grouting holes are filled with grouting materials, and the grouting materials are used for pouring the prefabricated laminated side wall and the cast-in-place bottom plate into a whole; prefabricated laminated side walls are manufactured in a factory, a cast-in-place bottom plate is manufactured on a construction site, the prefabricated laminated side walls are installed on the cast-in-place bottom plate, bedding slurry is laid between the prefabricated laminated side walls and the cast-in-place bottom plate, and meanwhile grouting materials are poured into cavities and large holes; the stress performance and the reliability of the connecting node of the prefabricated laminated side wall and the cast-in-place bottom plate are improved; and meanwhile, a wet connection construction method is adopted at the connecting node of the prefabricated laminated side wall and the cast-in-place bottom plate, so that the waterproof performance of the connecting node is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of assembly engineering, and specifically relates to a load-bearing structure. Background Art

[0002] The fully prefabricated assembly method divides the subway station cross section into four components: the top plate, the left and right side wall blocks, and the bottom plate at the less stressed part. The longitudinal section of the station remains unchanged and is divided every 2m. 100% of the concrete components are produced and cured in the factory, and then transported to the site for assembly. The nodes between the components are assembled into the entire station with bolts or mortise and tenon joints. Figure 1 shown.

[0003] The stress-deformation curve of the node of the full prefabrication assembly method is between semi-rigid and semi-flexible. When the node head resists the bending moment load, a certain rotational deformation is allowed. At the same time, the full prefabrication transfer method is a dry method connection; therefore, the defects of the full prefabrication assembly method are:

[0004] There are problems at the nodes such as unreliable node force and poor waterproof performance at the nodes. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present application is to provide a load-bearing structure, by manufacturing prefabricated composite side walls in a factory, manufacturing a cast-in-place base plate at a construction site, installing the prefabricated composite side walls on the cast-in-place base plate, laying mortar between the two, and pouring grouting material in the cavity and large holes; the stress performance and reliability of the connection node between the prefabricated composite side wall and the cast-in-place base plate are improved; at the same time, the connection node between the prefabricated composite side wall and the cast-in-place base plate adopts a wet connection method, which improves the waterproof performance of the connection node.

[0006] In order to solve the above problems, the present application provides a load-bearing structure, including a cast-in-place bottom plate and a prefabricated composite side wall, a plurality of first connecting steel bars and a plurality of second connecting steel bars are arranged at intervals along the transverse direction on the top surfaces of both ends of the cast-in-place bottom plate, a portion of the plurality of first connecting steel bars and a plurality of second connecting steel bars are located inside the cast-in-place bottom plate, and a portion of the plurality of first connecting steel bars and a plurality of second connecting steel bars are extended outside the cast-in-place bottom plate;

[0007] The prefabricated composite side wall is provided with a cavity and a grouting hole. The bottom surface of the prefabricated composite side wall is placed on the top surface of the end of the cast-in-place bottom plate and extends to the part outside the cast-in-place bottom plate. The first connecting steel bar is inserted into the cavity, and the second connecting steel bar is inserted into the grouting hole when extending to the part outside the cast-in-place bottom plate. Grouting material is filled in the cavity and the grouting hole to cast the prefabricated composite side wall and the cast-in-place bottom plate into one.

[0008] Optionally, the prefabricated composite side wall includes an outer leaf wall and an inner leaf wall, the bottom surfaces of the outer leaf wall and the inner leaf wall are both placed on the top surface of the cast-in-place base plate, and a cavity is formed between the outer leaf wall and the inner leaf wall, and the outer leaf wall and the inner leaf wall are fixed by a plurality of tension rods.

[0009] Optionally, the spacing between adjacent grouting holes is 2 to 3 times the spacing between adjacent reinforcement bars.

[0010] The outer leaf wall is located on the water-facing side, and the water-facing surface is aligned with the outer side surface of the cast-in-place bottom plate. The inner leaf wall is located on the water-repellent side, and the water-repellent surface is aligned with the inner side surface of the cast-in-place bottom plate.

[0011] Optionally, the wall thickness of the outer leaf wall is smaller than the wall thickness of the inner leaf wall.

[0012] Optionally, mortar is laid between the bottom surface of the outer leaf wall and the top surface of the cast-in-place base plate, and between the bottom surface of the inner leaf wall and the top surface of the cast-in-place base plate.

[0013] Optionally, the height of the slurry at the bottom surface of the outer leaf wall is lower than the height of the slurry at the bottom surface of the inner leaf wall.

[0014] Optionally, a plurality of grouting holes arranged at intervals in a transverse direction are provided inside the inner leaf wall, the top ends of the grouting holes are inclined and connected to the back water surface of the inner leaf wall, and the bottom ends of the grouting holes are connected to the bottom surface of the inner leaf wall.

[0015] Optionally, the outer leaf wall includes a plurality of outer leaf wall longitudinal reinforcements and a plurality of outer leaf wall horizontal reinforcements, wherein the plurality of outer leaf wall longitudinal reinforcements are arranged at intervals in the transverse direction, and the plurality of outer leaf wall horizontal reinforcements are arranged at intervals in the longitudinal direction, and the outer leaf wall horizontal reinforcements are welded to the outer leaf wall longitudinal reinforcements at the overlaps to form an outer leaf wall reinforcement skeleton, and the outer leaf wall reinforcement skeleton is set in concrete.

[0016] Optionally, the inner leaf wall includes inner leaf wall longitudinal reinforcement and inner leaf wall horizontal reinforcement, a number of the inner leaf wall longitudinal reinforcements are arranged at intervals along the transverse direction, a number of the inner leaf wall horizontal reinforcements are arranged at intervals along the longitudinal direction, and the inner leaf wall horizontal reinforcements are welded to the inner leaf wall longitudinal reinforcements at the overlap to form an inner leaf wall reinforcement skeleton, and the inner leaf wall reinforcement skeleton is set in the concrete.

[0017] Beneficial Effects

[0018] The load-bearing structure provided in the embodiment of the utility model is: by manufacturing prefabricated composite side walls in the factory, manufacturing cast-in-place bottom plates on site, placing the prefabricated composite side walls on the cast-in-place bottom plates, and laying grouting material between the prefabricated composite side walls and the cast-in-place bottom plates to improve the integrity of the connection between the two; then inserting the first connecting steel bar on the cast-in-place bottom plate into the cavity of the prefabricated composite side wall, inserting the second connecting steel bar on the cast-in-place bottom plate into the grouting hole, and then pouring grouting material in the cavity and the grouting hole, so that the prefabricated composite side wall and the cast-in-place bottom plate become a whole. Compared with the existing full prefabrication assembly method, the prefabricated composite side wall and the cast-in-place bottom plate are connected at the connection node with connecting steel bars, and the overall force performance and reliability of the structure are better. At the same time, due to the use of wet connection method, the waterproof performance at the connection node is also better. Compared with the cast-in-place method, the construction period is greatly shortened.

[0019] The load-bearing structure provided in the embodiment of the utility model has good overall stress-bearing performance of the station and has the advantages of lightweight and simple construction process of underground prefabricated stations. At the same time, prefabricated parts are used as templates, and there is no need to set up large templates on site, which implements the concept of industrialized production and construction and greatly shortens the construction period and construction difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the connection structure between the side wall and the bottom plate of an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the side wall structure of an embodiment of the present application;

[0022] Figure 3 This is a schematic diagram of the cross-sectional reinforcement and component structure of the side wall at AA according to an embodiment of the present application.

[0023] The reference numerals are as follows:

[0024] Outer leaf wall, 2-inner leaf wall, 3-tensioning reinforcement, 4-outer leaf wall longitudinal reinforcement, 5-inner leaf wall longitudinal reinforcement, 601-outer leaf wall horizontal reinforcement, 602-inner leaf wall horizontal reinforcement, 7-grouting hole, 8-second connecting reinforcement, 9-seating grout, 10-first connecting reinforcement, 11-cast-in-place base plate, 12-cavity. DETAILED DESCRIPTION

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] See also Figures 1 to 3 As shown, according to an embodiment of the present application, a load-bearing structure includes a cast-in-place base plate 11 and a prefabricated composite side wall, a plurality of first connecting steel bars 10 and a plurality of second connecting steel bars 8 are arranged at intervals along the lateral direction on the top surfaces of both ends of the cast-in-place base plate 11, a portion of the plurality of first connecting steel bars 10 and the plurality of second connecting steel bars 8 are located inside the cast-in-place base plate 11, and a portion of the plurality of first connecting steel bars 10 and the plurality of second connecting steel bars 8 are extended to the outside of the cast-in-place base plate 11; a cavity 12 and a grouting hole 7 are provided on the prefabricated composite side wall, the bottom surface of the prefabricated composite side wall is placed on the top surface of the end of the cast-in-place base plate 11, and the first connecting steel bars 10 extending to the outside of the cast-in-place base plate 11 are inserted into the cavity 12, and the second connecting steel bars 8 extending to the outside of the cast-in-place base plate 11 are inserted into the grouting hole 7; grouting material is filled in the cavity 12 and the grouting hole 7 to cast the prefabricated composite side wall and the cast-in-place base plate 11 into one.

[0030] The load-bearing structure provided in the embodiment of the utility model is: by manufacturing the prefabricated composite side wall in the factory, manufacturing the cast-in-place bottom plate 11 on site, placing the prefabricated composite side wall on the cast-in-place bottom plate 11, and laying the grouting material 9 between the prefabricated composite side wall and the cast-in-place bottom plate 11 to improve the integrity of the connection between the two; then inserting the first connecting steel bar 10 on the cast-in-place bottom plate 11 into the cavity 12 of the prefabricated composite side wall, inserting the second connecting steel bar 8 on the cast-in-place bottom plate 11 into the grouting hole 7, and then pouring the grouting material into the cavity 12 and the grouting hole 7, so that the prefabricated composite side wall and the cast-in-place bottom plate 11 become a whole. Compared with the existing full prefabrication assembly method, the prefabricated composite side wall and the cast-in-place bottom plate 11 are connected at the connection node with connecting steel bars, and the overall force performance and reliability of the structure are better. At the same time, due to the use of the wet connection method, the waterproof performance at the connection node is also better. Compared with the cast-in-place method, the construction period is greatly shortened.

[0031] The cast-in-place bottom plate 11 includes a steel cage arranged in the longitudinal direction and in the horizontal direction and a profiled steel frame arranged in the transverse direction, which together form a steel frame structure. The two ends of the steel cage arranged in the horizontal direction extend to the interior of the steel cage arranged in the longitudinal direction, and the two ends of the steel frame arranged in the transverse direction also extend to the interior of the steel cage arranged in the longitudinal direction. At the same time, the height of the steel cage arranged in the longitudinal direction is higher than the height of the steel cage arranged in the horizontal direction. At the same time, the end of the steel frame arranged in the transverse direction is located above the steel cage arranged in the horizontal direction and lower than the top surface of the steel cage arranged in the longitudinal direction.

[0032] The first connecting steel bar 10 and the second connecting steel bar 8 are arranged longitudinally, and one end extends to the inside of the steel cage arranged longitudinally, and the other end extends to the outside of the steel cage arranged longitudinally; the protruding height of the first connecting steel bar 10 extending outside the longitudinal steel cage is greater than the protruding height of the second connecting steel bar 8 extending outside the longitudinal steel cage.

[0033] Concrete is poured on the steel skeleton structure, the first connecting steel bar 10 and the second connecting steel bar 8 to form a U-shaped cast-in-place floor 11. The floor of the subway underground station can be directly cast with concrete using the cushion layer as a template, so the floor is cast on site, and no additional template is required, which reduces the construction difficulty and shortens the construction time.

[0034] In this embodiment, the first connecting steel bar 10 is arranged close to the waterfront side, and two first connecting steel bars 10 are arranged in the same longitudinal plane; the first connecting steel bar 10 at the cavity 12 is considered according to the negative bending moment at the node (the outer leaf wall of the prefabricated composite side wall is under tension), and the effective height of the section is considered by deducting the thickness of the outer leaf wall 1. The reinforcement design at this location should be carried out according to the overall calculation results of the cast-in-place station.

[0035] The second connecting steel bar 8 is arranged close to the backwater side and is arranged one by one with the grouting holes 7. The second connecting steel bar 8 and the grouting holes 7 bear a part of the shear force to prevent the prefabricated composite side wall and the cast-in-place bottom plate 11 from lateral displacement and deformation at the horizontal joint. At the same time, the second connecting steel bar 8 bears a part of the positive bending moment (on the inner blade side of the prefabricated composite side wall) to prevent large deformation during normal use.

[0036] A construction method for a load-bearing structure comprises the following steps:

[0037] The enclosure structure is excavated in an open manner. After the base is dug, the cast-in-place bottom plate 11 is constructed. The steel skeleton structure of the cast-in-place bottom plate 11 is tied, and the first connecting steel bars 10 and the second connecting steel bars 8 are arranged. Concrete is poured, and the first connecting steel bars 10 and the second connecting steel bars 8 are reserved for matching with the cavity 12 and the grouting holes 7 of the prefabricated composite side wall.

[0038] The upper end surface of the left rubbing part of the cast-in-place bottom plate 11 is roughened, and then high-strength mortar 9 is laid on the top surfaces of both ends of the cast-in-place bottom plate 11;

[0039] The prefabricated composite side walls of the underground first floor are hoisted and assembled at both ends of the cast-in-place bottom plate 11, and the first connecting steel bar 10 is ensured to be inserted into the cavity 12 of the prefabricated composite side wall, and the second connecting steel bar 8 is ensured to be inserted into the grouting hole 7 of the prefabricated composite side wall, and the second connecting steel bar 8 is coaxial with the grouting hole 7;

[0040] Set up temporary triangular supports on the back surface of the prefabricated composite side wall to ensure the stability of the prefabricated composite side wall during construction;

[0041] Grouting material is poured into the cavity 12 and the grouting hole 7 of the prefabricated composite side wall, wherein the grouting material is high-strength slurry C60-C70 concrete, and the temporary triangular support is removed after the strength reaches the design requirement.

[0042] The prefabricated composite side wall and the cast-in-place bottom plate 11 are connected by wet connection of cast-in-place concrete, the cast-in-place bottom plate extends the first connecting steel bar 10 and the second connecting steel bar 8 to bear the bending moment at the horizontal joint, and the horizontal joint is connected by the cavity 12, the grouting hole 7 + the first connecting steel bar 10, and the second connecting steel bar 8;

[0043] Compared with the direct connection nodes of cast-in-place steel bars, the utility model can realize the connection of prefabricated composite side walls and cast-in-place bottom plates 11 under the horizontal joints of the assembled cast-in-place composite construction method in the subway station; compared with the fully prefabricated assembly node connection, the utility model can realize the node connection under the partially prefabricated and partially cast-in-place composite construction method; the force reliability and waterproof performance at the connection nodes are improved, and the construction period is also greatly shortened.

[0044] In another embodiment, the prefabricated composite side wall includes an outer leaf wall 1 and an inner leaf wall 2, the bottom surfaces of the outer leaf wall 1 and the inner leaf wall 2 are both placed on the top surface of the cast-in-place bottom plate 11, and a cavity 12 is formed between the outer leaf wall 1 and the inner leaf wall 2, and the outer leaf wall 1 and the inner leaf wall 2 are connected and fixed by a plurality of tie bars 3. On the one hand, the force of the tie bars 3 should take into account the lateral pressure generated before the concrete is solidified when the concrete is poured on site, so as to ensure the stability of the prefabricated composite side wall during the construction and assembly process; on the other hand, the deformation stability of the inner and outer leaf walls 1 during the transportation and hoisting process before assembly should be considered to prevent the generation of out-of-plane flexural deformation, etc.

[0045] Among them, a plurality of tie bars 3 are arranged at equal intervals along the longitudinal and transverse directions of the prefabricated composite side wall, and hooks are formed at both ends of the tie bars 3. At the same time, both ends of the tie bars 3 extend to the inside of the outer leaf wall 1 and the inner leaf wall 2 respectively.

[0046] The shape of the transverse cross section of the inner leaf wall 2 is a "convex" shape, and the shape of the transverse cross section of the outer leaf wall 1 is a rectangle.

[0047] The height of the prefabricated composite side wall is 6-7m. Under the water and soil pressure load on the water-facing surface, the prefabricated composite side wall bears bending moment, shear force, and axial force, and should meet the requirements for seismic performance in the "Metro Design Code" and "Seismic Design Standard for Underground Structures".

[0048] In another embodiment, the spacing between adjacent grouting holes 7 is 2 to 3 times the spacing between adjacent tie bars 3. Tie bars 3 are used to connect the inner leaf wall 2 and the outer leaf wall 1 to enhance the overall stability of the prefabricated composite side wall. Grouting holes 7 are the second insurance to ensure the vertical connection of the prefabricated composite side wall and increase the stability of the connection at the node. Therefore, the spacing between grouting holes 7 and tie bars 3 is limited to ensure the construction requirements while reducing the construction difficulty and saving the materials required for construction.

[0049] In another embodiment, the outer leaf wall 1 is located on the water-facing side and the water-facing surface is aligned with the outer side of the cast-in-place bottom plate 11, and the inner leaf wall 2 is located on the water-repellent side and the water-repellent surface is aligned with the inner side of the cast-in-place bottom plate 11. It is ensured that the water-facing surface of the outer leaf wall 1 and the outer side of the cast-in-place bottom plate 11 are in the same vertical plane, and at the same time, it is ensured that the water-repellent surface of the inner leaf wall 2 and the inner side of the cast-in-place bottom plate 11 are in the same vertical plane, so as to improve the overall installation accuracy, ensure the overall installation consistency, and reduce the installation error.

[0050] In another embodiment, the wall thickness of the outer leaf wall 1 is less than that of the inner leaf wall 2. This is mainly because the positive moment (inner tension) area of ​​the inner leaf wall 2 is relatively large, while the negative moment is only in a certain area at the top and bottom of the outer leaf wall 1. Therefore, by designing the outer leaf wall 1 to have a smaller wall thickness than the inner leaf wall 2, the overall force performance is improved to meet the seismic requirements.

[0051] In another embodiment, mortar 9 is laid between the bottom surface of the outer leaf wall 1 and the top surface of the cast-in-place bottom plate 11 , and between the bottom surface of the inner leaf wall 2 and the top surface of the cast-in-place bottom plate 11 .

[0052] Among them, the mortar 9 at the horizontal joints is made of UHPC material. Before laying the high-strength mortar, the top surfaces of both ends of the cast-in-place base plate 11 should be clean. At the same time, in order to improve the bonding performance, the top surfaces of both ends of the cast-in-place base plate 11 are roughened to ensure effective bonding at the interface between the cast-in-place base plate 11 and the prefabricated composite side wall.

[0053] In another embodiment, the height of the mortar 9 on the bottom surface of the outer leaf wall 1 is lower than the height of the mortar 9 on the bottom surface of the inner leaf wall 2; while ensuring that the prefabricated composite side wall and the cast-in-place base plate 11 are fully bonded and reasonably stressed at the joints, the use of the mortar 9 is reduced to save costs.

[0054] In other embodiments, in order to facilitate construction, the height of the mortar 9 on the bottom surface of the outer leaf wall 1 is consistent with the height of the mortar 9 on the bottom surface of the inner leaf wall 2.

[0055] The thickness of the mortar 9 on the bottom of the outer leaf wall 1 is the same as that of the outer leaf wall 1; the thickness of the mortar 9 on the bottom of the inner leaf wall 2 is the same as that of the inner leaf wall 2. The contact area between the outer leaf wall 1 and the mortar 9 and between the inner leaf wall 2 and the mortar 9 is ensured, thereby improving the bonding ability between the prefabricated composite side wall and the cast-in-place bottom plate 11 and improving the stress performance at the connection node.

[0056] In another embodiment, a plurality of grouting holes 7 are arranged at intervals in the transverse direction inside the inner leaf wall 2, the top of the grouting hole 7 is inclined and communicated with the back water surface of the inner leaf wall 2, and the bottom of the grouting hole 7 is communicated with the bottom surface of the inner leaf wall 2. This facilitates pouring of the grouting material 7 and ensures that the grouting material 7 is fully filled in the grouting hole 7, avoiding construction defects such as incomplete grouting.

[0057] In another embodiment, the outer leaf wall 1 includes a plurality of outer leaf wall longitudinal reinforcements 4 and a plurality of outer leaf wall horizontal reinforcements 601, the plurality of outer leaf wall longitudinal reinforcements 4 are arranged at intervals in the transverse direction, the plurality of outer leaf wall horizontal reinforcements 601 are arranged at intervals in the longitudinal direction, and the outer leaf wall horizontal reinforcements 601 are welded and connected to the outer leaf wall longitudinal reinforcements 4 at the overlap to form an outer leaf wall reinforcement skeleton, and the outer leaf wall reinforcement skeleton is set in the concrete.

[0058] Among them, the hook at one end of the tie rod 3 is hooked onto the outer leaf wall horizontal steel bar 601 of the outer leaf wall 1.

[0059] Concrete is poured and fully surrounds the outer leaf wall steel frame. The bonding force between the concrete and the outer leaf wall steel frame is used to make the two work closely together; after the concrete solidifies, the outer leaf wall steel frame and concrete together form a solid and stable outer leaf wall structure. Ensure that the outer leaf wall 1 has a good ability to resist negative bending moment and improve the stress performance of the outer leaf wall 1 itself.

[0060] In another embodiment, the inner leaf wall 2 includes inner leaf wall longitudinal reinforcements 5 and inner leaf wall horizontal reinforcements 602, a plurality of inner leaf wall longitudinal reinforcements 5 are arranged at intervals in the transverse direction, a plurality of inner leaf wall horizontal reinforcements 602 are arranged at intervals in the longitudinal direction, and the inner leaf wall horizontal reinforcements 602 are welded to the inner leaf wall longitudinal reinforcements 5 at the overlap to form an inner leaf wall reinforcement skeleton, and the inner leaf wall reinforcement skeleton is set in the concrete.

[0061] Among them, the hook at the other end of the tie rod 3 is hooked onto the inner leaf wall horizontal steel bar 602 of the inner leaf wall 2.

[0062] Pour concrete and fully surround the inner leaf wall steel frame. The concrete and the inner leaf wall steel frame use bonding force to make the two work closely together. After the concrete solidifies, the inner leaf wall steel frame and concrete together form a solid and stable inner leaf wall structure. Ensure that the inner leaf wall 2 has a good ability to resist positive bending moment and improve the stress performance of the inner leaf wall 2 itself.

[0063] In view of the fact that the existing cast-in-place node connection method and the fully prefabricated node connection method are not applicable to the open-cut assembly cast-in-place composite subway underground station, this application proposes a load-bearing structure, which is applicable to the side wall and bottom plate connection node method of the open-cut assembly cast-in-place composite subway underground station. The side wall is a prefabricated composite component, and the bottom plate is cast-in-place. This node is the most stressed part of the subway underground station. It must meet the water and soil pressure load and seismic bearing capacity requirements during the normal use stage, as well as the load generated by the on-site pouring of concrete in the cavity of the composite component during the construction and assembly stage, as well as the requirements of on-site construction assembly and component connection.

[0064] By adopting the connection node construction method of the present application, the requirements of node force safety and reasonable structure are met, and the purpose of the on-site construction assembly process of assembling cast-in-place composite stations is met.

[0065] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0066] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A load-bearing structure, characterized in that: include A cast-in-place bottom plate (11), a plurality of first connecting steel bars (10) and a plurality of second connecting steel bars (8) arranged at intervals in the transverse direction on the top surfaces of both ends of the cast-in-place bottom plate (11), wherein a portion of the plurality of first connecting steel bars (10) and a portion of the plurality of second connecting steel bars (8) are located inside the cast-in-place bottom plate (11) and a portion of the plurality of first connecting steel bars (10) and the plurality of second connecting steel bars (8) are extended outside the cast-in-place bottom plate (11); A prefabricated composite side wall, wherein a cavity (12) and a grouting hole (7) are arranged on the prefabricated composite side wall, the bottom surface of the prefabricated composite side wall is placed on the top surface of the end of the cast-in-place bottom plate (11), and the first connecting steel bar (10) is inserted into the cavity (12) and the second connecting steel bar (8) is inserted into the grouting hole (7) extending to the outside of the cast-in-place bottom plate (11); grouting material is filled in the cavity (12) and the grouting hole (7) to cast the prefabricated composite side wall and the cast-in-place bottom plate (11) into one piece.

2. A load-bearing structure according to claim 1, characterized in that: The prefabricated composite side wall comprises an outer leaf wall (1) and an inner leaf wall (2); the bottom surfaces of the outer leaf wall (1) and the inner leaf wall (2) are both placed on the top surface of the cast-in-place base plate (11); a cavity (12) is formed between the outer leaf wall (1) and the inner leaf wall (2); the outer leaf wall (1) and the inner leaf wall (2) are connected and fixed by a plurality of tie rods (3).

3. A load-bearing structure according to claim 2, characterized in that: The spacing between adjacent grouting holes (7) is 2 to 3 times the spacing between adjacent tension bars (3).

4. A load-bearing structure according to claim 2, characterized in that: The outer leaf wall (1) is located on the water-facing side and its water-facing surface is aligned with the outer side of the cast-in-place bottom plate (11); the inner leaf wall (2) is located on the water-repellent side and its water-repellent surface is aligned with the inner side of the cast-in-place bottom plate (11).

5. A load-bearing structure according to claim 2, characterized in that: The wall thickness of the outer leaf wall (1) is smaller than the wall thickness of the inner leaf wall (2).

6. A load-bearing structure according to claim 2, characterized in that: Sealing mortar (9) is laid between the bottom surface of the outer leaf wall (1) and the top surface of the cast-in-place base plate (11), and between the bottom surface of the inner leaf wall (2) and the top surface of the cast-in-place base plate (11).

7. A load-bearing structure according to claim 6, characterized in that: The height of the slurry (9) on the bottom surface of the outer leaf wall (1) is lower than the height of the slurry (9) on the bottom surface of the inner leaf wall (2).

8. A load-bearing structure according to claim 2, characterized in that: A plurality of grouting holes (7) are arranged at intervals in a transverse direction inside the inner leaf wall (2); the top ends of the grouting holes (7) are inclined and communicated with the back water surface of the inner leaf wall (2); and the bottom ends of the grouting holes (7) are communicated with the bottom surface of the inner leaf wall (2).

9. A load-bearing structure according to claim 2, characterized in that: The outer leaf wall (1) comprises a plurality of outer leaf wall longitudinal bars (4) and a plurality of outer leaf wall horizontal steel bars (601), wherein the plurality of outer leaf wall longitudinal bars (4) are arranged at intervals in the transverse direction, and the plurality of outer leaf wall horizontal steel bars (601) are arranged at intervals in the longitudinal direction, and the outer leaf wall horizontal steel bars (601) are welded to the outer leaf wall longitudinal bars (4) at the overlap to form an outer leaf wall steel bar skeleton, and the outer leaf wall steel bar skeleton is arranged in concrete.

10. A load-bearing structure according to claim 2, characterized in that: The inner leaf wall (2) comprises inner leaf wall longitudinal reinforcement (5) and inner leaf wall horizontal reinforcement (602), a number of the inner leaf wall longitudinal reinforcement (5) are arranged at intervals in the transverse direction, a number of the inner leaf wall horizontal reinforcement (602) are arranged at intervals in the longitudinal direction, and the inner leaf wall horizontal reinforcement (602) is welded to the inner leaf wall longitudinal reinforcement (5) at the overlap to form an inner leaf wall reinforcement skeleton, and the inner leaf wall reinforcement skeleton is set in concrete.

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