Semi-prefabricated large box culvert structure

Abstract

The utility model discloses a semi-prefabricated large box culvert structure which is located in a strip-shaped foundation pit and comprises a concrete cushion layer, two rows of parallel prefabricated concrete side walls stacked at intervals in the rows are placed on the concrete cushion layer, the prefabricated concrete side walls are in a rectangular vertical plate shape, cast-in-place spacer columns are poured between the prefabricated concrete side walls, and cast-in-place bottom plates of the cast-in-place spacer columns are arranged on the concrete cushion layer. The prefabricated concrete side walls are formed on a concrete cushion layer between the two rows of prefabricated concrete side walls in a pouring mode. The cast-in-place top plate is formed at the top ends of the two rows of precast concrete side walls in a pouring mode, and the precast concrete side walls, the cast-in-place spacing columns, the cast-in-place bottom plate and the cast-in-place top plate which are arranged in two rows at intervals jointly form a closed box culvert pipe section. The problems that full assembly is inconvenient to construct and produce and the overall pouring construction period efficiency is low are solved to a certain degree, meanwhile, the installation precision of prefabricated parts is lower than that of a conventional semi-prefabricated construction method, and the field installation efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to underground engineering construction, and more specifically, to a semi-prefabricated large box culvert structure. Background Art

[0002] With the continuous advancement of urbanization, underground box culvert-type pipeline corridors have been widely adopted as an underground structure that can uniformly accommodate and organize municipal pipelines such as electricity, heating, communications, water supply and drainage, gas, radio and television.

[0003] During the construction of box culvert tunnels, there are three main construction methods: fully prefabricated, semi-prefabricated, and cast-in-place. For the construction of small box culvert structures, fully prefabricated construction is often used. This method divides the entire tunnel into several box culvert segments, and completes the construction of all the segments through front-to-back socket or jointing. However, this method is only suitable for projects with smaller dimensions. Larger tunnel structures are limited by factors such as site availability, transportation, and lifting capacity. Semi-prefabricated construction can be used to divide the entire tunnel into several segments to meet transportation and lifting requirements. After the segments are assembled on-site, grouting is used at the joints to form the entire structure. Cast-in-place construction is the lowest cost and has a mature construction method. Since many tunnel corridor projects currently have curved structures, the cost of standardized segments cannot be achieved with fully prefabricated or semi-prefabricated construction methods, making them too expensive. Therefore, cast-in-place construction is also commonly used for large box culvert structures.

[0004] Chinese patent CN205975676U discloses a split staggered prefabricated box culvert, in which the middle part of the box side wall is transversely divided into an upper box body and a lower box body that are independent of each other, so as to facilitate production, transportation and lifting. However, this type of prefabricated box culvert is still not suitable for the transportation and on-site installation of large box culvert components.

[0005] In the construction of large box culvert structures, the cast-in-place construction method is most commonly used in projects with complex working environments and many construction restrictions. However, the formwork work in the cast-in-place construction method takes a long time, and the on-site formwork project also has a certain impact on the construction organization. Therefore, it is necessary to propose a box culvert structure form that uses partially prefabricated components to facilitate on-site cast-in-place operations. Utility Model Content

[0006] One purpose of the utility model is to provide a semi-prefabricated large box culvert structure, which is constructed by prefabricated wall components and assisted by a small amount of formwork for on-site pouring to complete the entire section.

[0007] In order to achieve these purposes and other advantages of the present invention, a semi-prefabricated large box culvert structure is provided, which is placed in a strip-shaped foundation pit and includes:

[0008] A concrete cushion layer is cast at the bottom of the foundation pit, and two rows of precast concrete side walls are placed on the concrete cushion layer. The precast concrete side walls are rectangular vertical plates, and cast-in-situ spacer columns are cast between any two adjacent precast concrete side walls at the side ends. The inner and outer side walls of the cast-in-situ spacer columns are flush with the inner and outer side walls of the adjacent precast concrete side walls; a cast-in-situ bottom plate is cast on the concrete cushion layer between the two rows of precast concrete side walls; a cast-in-situ top plate is cast on the top of the two rows of precast concrete side walls; wherein, the precast concrete side walls, cast-in-situ spacer columns, cast-in-situ bottom plate and cast-in-situ top plate arranged in two rows form a closed box culvert section.

[0009] Preferably, the cross-section of the precast concrete side wall is L-shaped, and a side wall extending bottom beam is horizontally extended on one side of the bottom thereof, the side wall extending bottom beams of the two rows of precast concrete side walls are opposite, and several sections of side wall bottom extending bars are horizontally extended from the side wall extending bottom beam, and bottom plate steel bars are cast in the cast-in-place bottom plate, and the bottom plate steel bars are tied to the side wall bottom extending bars on both sides.

[0010] Preferably, the top edge of the precast concrete side wall has a side wall top corbel extending horizontally to one side, the side wall top corbels of the two rows of precast concrete side walls are opposite to each other, the cast-in-place top plate includes a plurality of precast composite top plates and a cast-in-place portion of the top plate, the bottom of the precast composite top plate is placed on two opposite side wall top corbels, the cast-in-place portion of the top plate is cast and formed on the upper part of the precast composite top plate and the precast concrete side wall and forms a whole with the precast composite top plate and the precast concrete side wall.

[0011] Preferably, the top of the precast concrete side wall has side wall top extending reinforcement extending upward, and the precast composite top plate has top plate in-situ reinforcement tied horizontally, and the top plate in-situ reinforcement is tied to the side wall top extending reinforcement and cast together in the top plate cast-in-situ part.

[0012] Preferably, between the two rows of precast concrete side walls, there is one or more precast concrete partition walls stacked at intervals on the concrete cushion layer, the precast concrete partition walls are at the same height as the precast concrete side walls, the cross-section of the precast concrete partition walls is I-shaped, and partition wall extending bottom beams are horizontally extended on both sides of the bottom of the precast concrete partition walls. The top edge of the wall body of the precast concrete partition walls has partition wall top corbels extending horizontally on both sides, and the partition wall top corbels on each side correspond to the side wall top corbels on that side. The precast composite top plates are arranged in a matrix of multiple rows and the bottom surface is supported by the side wall top corbels and the partition wall top corbels. The cast-in-place part of the top plate is cast and formed on the upper part of the precast composite top plate, precast concrete side walls and precast concrete partition walls and forms a whole with the precast composite top plate, precast concrete side walls and precast concrete partition walls.

[0013] Preferably, the top edge of the precast concrete side wall, the two L-shaped side edges and the side edges of the side wall's outwardly extending bottom beam are half-buried with a ring-shaped side wall waterstop steel plate, and the plate body of the side wall waterstop steel plate is vertically embedded in the corresponding structural surfaces of the precast concrete side wall.

[0014] Preferably, the bottom of both ends of the precast concrete partition wall and the sides of the two partition wall protruding bottom beams are half-buried with a ring-shaped partition wall water-stopping steel plate horizontally, and the plate body of the partition wall water-stopping steel plate is vertically embedded in the various structural surfaces of the precast concrete partition wall.

[0015] Preferably, the concrete cushion layer is fully paved with a bottom waterproof membrane layer, the precast concrete side wall is placed on the bottom waterproof membrane layer, the parts of the bottom waterproof membrane layer on both sides extending outside the precast concrete side wall are turned up and covered on the outer wall of the precast concrete side wall, and the cast-in-place bottom plate is cast and formed on the bottom waterproof membrane layer.

[0016] Preferably, a top waterproofing membrane layer is laid on top of the cast-in-place roof slab, and both sides of the top waterproofing membrane layer are folded down and wrapped around the outer wall of the precast concrete side wall.

[0017] Preferably, a waterproof additional layer is vertically attached to the outer side wall of the cast-in-situ spacer column, and both sides of the waterproof additional layer are attached to the outer wall of the precast concrete side wall.

[0018] The utility model has at least the following beneficial effects:

[0019] First, the precast concrete side wall adopted by the present invention is a plate-shaped component with a certain shape. The single-piece component has a regular shape and a light weight, and is easy to transport and hoist.

[0020] Second, the precast concrete side walls used in the present invention first serve as the side formwork of the cast-in-place bottom plate, and secondly serve to support the precast composite top plate. The precast composite top plate is used as the bottom formwork to cast the cast-in-place top plate, which greatly reduces the workload of on-site formwork engineering.

[0021] Third, the present invention adopts a method of combining semi-prefabricated components with cast-in-place, which to a certain extent solves the problems of inconvenient construction and production of full assembly and low efficiency of the overall casting period. At the same time, the installation accuracy of prefabricated components is lower than that of conventional semi-prefabricated construction methods, and the on-site installation efficiency is further improved.

[0022] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0024] Figure 1 This is a schematic diagram of the structural hoisting construction of the utility model;

[0025] Figure 2 This is a schematic diagram of the completed construction of the cast-in-situ spacer column and cast-in-situ base plate of the utility model;

[0026] Figure 3 This is a schematic diagram of the hoisting of the prefabricated composite roof of the present utility model;

[0027] Figure 4 It is an overall schematic diagram of the utility model;

[0028] Figure 5 It is a cross-sectional schematic diagram of a technical solution of the utility model;

[0029] Figure 6 A schematic cross-sectional view of a technical solution of the present invention in which a precast concrete partition wall is added;

[0030] Figure 7 This is a schematic diagram of a precast concrete partition wall of the present utility model;

[0031] Figure 8 This is a schematic diagram of the precast concrete side wall of the present utility model;

[0032] Figure 9 This is a schematic diagram of the combination of the prefabricated composite roof and the cast-in-place portion of the roof of the present invention.

[0033] Legend: 1-concrete cushion, 2-precast concrete side wall, 20-side wall horizontal reinforcement, 200-side wall longitudinal reinforcement, 201-side wall top extension reinforcement, 202-side wall bottom extension reinforcement, 21-side wall top corbel, 22-side wall extension bottom beam, 23-side wall waterstop steel plate, 24-cast-in-situ spacer, 3-cast-in-situ bottom plate, 31-bottom plate reinforcement, 4-cast-in-situ top plate, 40-precast composite top plate, 400-top plate cast-in-situ part, 41-top plate tied reinforcement, 42-precast plate bracket, 5-bottom waterproofing membrane layer, 51-top waterproofing membrane layer, 52-waterproofing additional layer, 6-precast concrete partition wall, 60-partition wall horizontal reinforcement, 600-partition wall longitudinal reinforcement, 61-partition wall top corbel, 62-partition wall extension bottom beam, 63-partition wall waterstop steel plate DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0035] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0036] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the components are commercially available unless otherwise specified. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense. For example, they can be fixedly connected or set, or detachably connected or set, or connected or set as a whole. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. The directions or positional relationships indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0037] like Figures 1 to 9 As shown, the technical solution of the present application provides a semi-prefabricated large box culvert structure, which is located within a strip-type foundation pit and includes: a concrete cushion layer 1 cast at the bottom of the foundation pit, on which are placed two rows of precast concrete side walls 2 that are parallel to each other and spaced apart within the rows, the precast concrete side walls 2 being rectangular vertical plates, and cast-in-place spacing columns 24 are cast between any two adjacent side ends of the precast concrete side walls 2, the inner and outer side walls of the cast-in-place spacing columns 24 being flush with the inner and outer side walls of the adjacent precast concrete side walls 2; a cast-in-place bottom plate 3, which is cast and formed on the concrete cushion layer 1 between the two rows of precast concrete side walls 2; a cast-in-place top plate 4, which is cast and formed on the top of the two rows of precast concrete side walls 2; wherein, the precast concrete side walls 2, the cast-in-place spacing columns 24, the cast-in-place bottom plate 3, and the cast-in-place top plate 4 arranged in two rows form a closed box culvert pipe section. In the present technical solution, after completing conventional measures such as grooving, slope protection and base treatment, the concrete cushion layer 1 is poured at the bottom of the foundation pit. The upper surface of the concrete cushion layer 1 needs to be manually finished before initial setting to ensure flatness. After the concrete cushion layer 1 reaches a certain strength, the precast concrete side walls 2 are stacked one by one on the concrete cushion layer 1 through a lifting device according to the design route. Optionally, the waterproof layer can be completed on the upper surface of the concrete cushion layer 1 before the components are stacked, and then the precast concrete side walls 2 are placed on the waterproof layer along the design route. The waterproof layer can adopt a polymer self-adhesive film waterproof membrane and perform a pre-laid reverse bonding method. The subsequent cast-in-place base plate 3 is directly cast on the waterproof layer.

[0038] In the present technical solution, the internal reinforcement of the precast concrete side wall 2 includes side wall horizontal reinforcement 20 and side wall longitudinal reinforcement 200. The above-mentioned reinforcement can be extended from the component so as to be subsequently tied with the on-site reinforcement. When all the precast concrete side walls 2 along the line are stacked, the bottom plate reinforcement 31 is manually tied between the precast concrete side walls 2. The bottom plate reinforcement 31 can be a steel cage that has been tied outside the foundation pit, and is strengthened as a whole with additional lap reinforcement. The reinforcement is manually planted and overlapped in the gap between the side ends of each precast concrete side wall 2. The side wall horizontal reinforcement 20 can also be extended to leave a lap length when the precast concrete side wall 2 is produced. After the on-site reinforcement work is completed, the gap between the side ends of the precast concrete side walls 2 is sealed with a formwork, and the cast-in-place bottom plate 3 and cast-in-place spacer columns 24 are cast in the same batch. After the cast-in-place bottom plate 3 reaches 50% strength, a support frame is constructed on the cast-in-place bottom plate 3 and a top formwork is supported, wherein the top formwork is aligned with the top of the precast concrete side walls 2 on both sides, and the top plate tied steel bars 41 are manually tied to the top formwork. Optionally, the precast concrete side walls 2 can extend the reserved longitudinal reinforcement upward so as to complete the binding with the top plate tied steel bars 41, so that the overall structural node has better stress performance. After the top plate is cast, the waterproof layer can be constructed on the side walls and top plate of the entire box culvert structure according to the actual environment requirements.

[0039] In the present technical solution, the side walls of the conventional box culvert structure are prefabricated components. Compared with the overall prefabrication cost, the present structure has a lower cost and greatly improved transportation efficiency and lifting efficiency. In addition, due to the cast-in-place process, the precast concrete side walls 2 of standard size can be stacked into a curve and connected through the cast-in-place spacer columns 24 that are subsequently cast in-place. The cast-in-place bottom plate 3 uses the precast concrete side walls 2 on both sides as side formwork. It only needs to be hoisted down or tied with the bottom plate steel bars 31 before it can be cast and formed. At this time, the box culvert is U-shaped as a whole, which also provides more options for the construction selection form of pipeline operations in the box culvert. The cast-in-place top plate 4 can be constructed first and then the pipe can be threaded, or the pipeline can be constructed first and then the cast-in-place top plate 4 can be constructed. The present invention combines the advantages of cast-in-place construction structure and prefabricated and semi-prefabricated construction methods, improves the production and transportation efficiency of prefabricated components, saves costs to a certain extent, and greatly improves the on-site construction efficiency compared to the pure cast-in-place construction process.

[0040] In another technical solution, the cross-section of the precast concrete side wall 2 is L-shaped, and a side wall extending bottom beam 22 is horizontally extended on one side of the bottom. The side wall extending bottom beams 22 of the two rows of precast concrete side walls 2 are opposite to each other. The side wall extending bottom beam 22 has several sections of side wall bottom extending bars 202 extending horizontally. The cast-in-place bottom plate 3 is cast with bottom plate steel bars 31, and the bottom plate steel bars 31 are tied to the side wall bottom extending bars 202 on both sides. The cross-section of the precast concrete side wall 2 is L-shaped, which allows the precast concrete side wall 2 to be stably stacked on the concrete cushion layer 1, and is not prone to shaking or even tilting without additional support. The side wall bottom extending bars 202 are used to work together with the bottom plate steel bars 31 after being tied, and the node stress performance is better.

[0041] In another technical solution, the top edge of the precast concrete side wall 2 is horizontally extended to one side with a side wall top bracket 21, and the side wall top brackets 21 of the two rows of precast concrete side walls 2 are opposite to each other. The cast-in-situ top plate 4 includes a plurality of precast composite top plates 40 and a top plate cast-in-situ portion 400. The bottom of the precast composite top plate 40 is placed on the two opposite side wall top brackets 21. The top plate cast-in-situ portion 400 is cast and formed on the upper part of the precast composite top plate 40 and the precast concrete side wall 2 and is connected to the precast composite top plate 40 and The precast concrete side wall 2 forms a whole. In the present technical solution, the precast composite top plate 40 is produced in a precast component processing plant and transported to the site after being stacked. After the cast-in-place bottom plate 3 and the cast-in-place spacer column 24 are completed, they are hoisted onto the side wall top corbel 21. The support method of the precast plate bracket 42 below the precast composite top plate 40 is determined according to the construction load. After the support of the precast plate bracket 42 is completed, the side formwork is manually supported on the outer wall of the precast concrete side wall 2 to cast the cast-in-place part 400 of the top plate.

[0042] In another technical solution, the top of the precast concrete side wall 2 has a side wall top extending reinforcement 201 extending upward, and the precast composite top plate 40 is horizontally tied with a top plate existing reinforcement 41. The top plate existing reinforcement 41 is tied with the side wall top extending reinforcement 201 and cast together in the top plate cast-in-place part 400. The top plate existing reinforcement 41 can be a steel mesh that has been preliminarily tied. After being hoisted in pieces on the precast composite top plate 40, additional connections are made by overlapping steel bars, and the top plate existing reinforcement 41 is directly tied with the side wall top extending reinforcement 201 or hook bars are added to complete the connection.

[0043] In another technical solution, between the two rows of precast concrete side walls 2, there is one or more precast concrete partition walls 6 stacked at intervals on the concrete cushion 1. The precast concrete partition walls 6 are at the same height as the precast concrete side walls 2. The cross-section of the precast concrete partition walls 6 is an I-shape. The bottom sides of the precast concrete partition walls 6 are horizontally extended with partition wall extension bottom beams 62. The top edge of the wall body of the precast concrete partition wall 6 is horizontally extended to both sides with partition wall top brackets 61. The partition wall top bracket 61 on each side corresponds to the side wall top bracket 21 on that side. The precast composite top plates 40 are arranged in a matrix of multiple rows and the bottom surface is supported by the side wall top brackets. The legs 21 and the partition wall top corbels 61 are supported together, and the cast-in-place part 400 of the top plate is cast and formed on the upper part of the precast composite top plate 40, the precast concrete side walls 2, and the precast concrete partition wall 6 and forms a whole with the precast composite top plate 40, the precast concrete side walls 2, and the precast concrete partition wall 6. In this technical solution, a large box culvert-type pipeline corridor often has multiple independent compartment pipe sections, and the precast concrete partition wall 6 is a precast partition wall structure, which is produced and transported in the same batch as the precast concrete side wall 2. The functions of the partition wall top corbels 61 and the partition wall extended bottom beams 62 are the same as those of the side wall top corbels 21 and the side wall extended bottom beams 22.

[0044] In another technical solution, the top edge of the precast concrete side wall 2, the two L-shaped side edges and the side edges of the side wall protruding bottom beam 22 are half-buried with a ring-shaped side wall waterstop steel plate 23. The plate body of the side wall waterstop steel plate 23 is vertically embedded in the corresponding structural surfaces of the precast concrete side wall 2. The side wall waterstop steel plate 23 is welded or tied with the partition wall horizontal reinforcement 60 and the partition wall longitudinal reinforcement 600 in the precast concrete side wall 2 in the precast component processing plant to form an integral part and then cast. After the box culvert structure is completed as a whole, half of the side wall waterstop steel plate 23 is buried in the precast concrete side wall 2, and the other half is buried in the cast-in-place bottom plate 3, the cast-in-place spacer column 24 and the top plate cast-in-place part 400 respectively. The side wall waterstop steel plate 23 is used to completely block the gap between the precast structural surface and the cast-in-place structural surface, and to prevent water from entering the interior of the pipe corridor from the gap between the precast structural surface and the cast-in-place structural surface when the external waterproofing of the box culvert fails.

[0045] In another technical solution, the bottom of both ends of the precast concrete partition wall 6 and the sides of the two partition wall protruding bottom beams 62 are half-buried with a ring-shaped partition wall water-stopping steel plate 63, and the plate body of the partition wall water-stopping steel plate 63 is vertically embedded in the various structural surfaces of the precast concrete partition wall 6.

[0046] In another technical solution, the concrete cushion layer 1 is fully paved with a bottom waterproof membrane layer 5, the precast concrete side wall 2 is placed on the bottom waterproof membrane layer 5, and the parts of the bottom waterproof membrane layer 5 on both sides extending outside the precast concrete side wall 2 are turned up and covered on the outer wall of the precast concrete side wall 2, and the cast-in-place bottom plate 3 is cast and formed on the bottom waterproof membrane layer 5. The bottom waterproof membrane layer 5 can be a polymer self-adhesive film waterproof membrane, which is laid on the surface of the concrete cushion layer 1, and after the two rows of precast concrete side walls 2 are stacked and the construction of the cast-in-place bottom plate 3 is completed, the surface of the bottom waterproof membrane layer 5 can be firmly bonded to the cast-in-place bottom plate 3. After the cast-in-place bottom plate 3 and the cast-in-place spacer column 24 are completed, the two sides of the bottom waterproof membrane layer 5 are turned up and covered on the precast concrete side wall 2. During the construction process, at joints, corners and other locations, a waterproof additional layer 52 is added with reference to the commonly used waterproof specifications for buildings.

[0047] In another technical solution, a top waterproof membrane layer 51 is laid on top of the cast-in-place top plate 4. Both sides of the top waterproof membrane layer 51 are turned down and outwardly wrapped on the outer wall of the precast concrete side wall 2. Conventional waterproof membranes such as SBS modified asphalt waterproof membrane and root penetration resistant waterproof membrane can be selected for the top waterproof membrane layer 51. After being manually laid on the cast-in-place top plate 4 on site, both sides are turned down. The turned-down part of the top waterproof membrane layer 51 can form an overlapping relationship with the bottom waterproof membrane layer 5. Optionally, an additional waterproofing measure can be added at the overlapping portion between the top waterproof membrane layer 51 and the bottom waterproof membrane layer 5.

[0048] In another technical solution, a waterproof additional layer 52 is vertically attached to the outer side wall of the cast-in-situ spacer column 24 , and both sides of the waterproof additional layer 52 are attached to the outer wall of the precast concrete side wall 2 .

[0049] The number of components and processing scales described herein are for simplifying the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

[0050] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with this field, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A semi-prefabricated large box culvert structure located within a strip foundation pit, characterized in that: include: A concrete cushion layer (1) is cast at the bottom of a foundation pit, and two rows of precast concrete side walls (2) are placed on the concrete cushion layer (1), which are parallel to each other and spaced apart within the rows. The precast concrete side walls (2) are rectangular vertical plates, and cast-in-situ spacer columns (24) are cast between any two adjacent side ends of the precast concrete side walls (2). The inner and outer side walls of the cast-in-situ spacer columns (24) are flush with the inner and outer side walls of the adjacent precast concrete side walls (2); A cast-in-place base plate (3) is cast on a concrete cushion (1) between two rows of precast concrete side walls (2); A cast-in-place top plate (4) is cast on top of two rows of precast concrete side walls (2); A plurality of precast concrete side walls (2) arranged in two rows at intervals, cast-in-situ spacing columns (24), cast-in-situ bottom plates (3), and cast-in-situ top plates (4) together form a closed box culvert section.

2. The semi-prefabricated large box culvert structure according to claim 1, characterized in that: The cross section of the precast concrete side wall (2) is L-shaped, and a side wall extending bottom beam (22) is horizontally extended on one side of the bottom of the precast concrete side wall (2). The side wall extending bottom beams (22) of the two rows of precast concrete side walls (2) are opposite to each other. The side wall extending bottom beams (22) are horizontally extended with a plurality of sections of side wall bottom extending reinforcement (202). The cast-in-place bottom plate (3) is cast with bottom plate reinforcement (31), and the bottom plate reinforcement (31) is tied to the side wall bottom extending reinforcement (202) on both sides.

3. The semi-prefabricated large box culvert structure according to claim 2, characterized in that: The top edge of the precast concrete side wall (2) is horizontally extended to one side by a side wall top bracket (21), and the side wall top brackets (21) of the two rows of precast concrete side walls (2) are opposite to each other. The cast-in-situ top plate (4) includes a plurality of precast composite top plates (40) and a top plate cast-in-situ portion (400). The bottom of the precast composite top plate (40) is placed on the two opposite side wall top brackets (21), and the top plate cast-in-situ portion (400) is cast and formed on the upper part of the precast composite top plate (40) and the precast concrete side wall (2) and forms a whole with the precast composite top plate (40) and the precast concrete side wall (2).

4. The semi-prefabricated large box culvert structure according to claim 3, characterized in that: The top of the precast concrete side wall (2) is provided with a side wall top extension bar (201) extending upward, and the precast composite top plate (40) is horizontally tied with a top plate in-situ reinforcement bar (41). The top plate in-situ reinforcement bar (41) is tied with the side wall top extension bar (201) and cast together in the top plate cast-in-situ portion (400).

5. The semi-prefabricated large box culvert structure according to claim 3, characterized in that: Between the two rows of precast concrete side walls (2), there is one or more precast concrete partition walls (6) stacked at intervals on the concrete cushion (1). The precast concrete partition walls (6) are of the same height as the precast concrete side walls (2). The cross section of the precast concrete partition walls (6) is an I-shaped section. The bottom of the precast concrete partition walls (6) is horizontally extended with partition wall extension bottom beams (62) on both sides. The top of the wall of the precast concrete partition walls (6) is horizontally extended with partition wall top brackets (61) on both sides. The wall top corbel (61) corresponds to the side wall top corbel (21) on this side; the prefabricated composite top plate (40) is arranged in a matrix of multiple rows and the bottom surface is supported by the side wall top corbel (21) and the partition wall top corbel (61); the top plate cast-in-place portion (400) is cast on the upper portion of the prefabricated composite top plate (40), the prefabricated concrete side wall (2), and the prefabricated concrete partition wall (6) and forms a whole with the prefabricated composite top plate (40), the prefabricated concrete side wall (2), and the prefabricated concrete partition wall (6).

6. The semi-prefabricated large box culvert structure according to claim 2, characterized in that: The top edge of the precast concrete side wall (2), the two L-shaped side edges and the side edges of the side wall protruding bottom beam (22) are half-buried with a ring-shaped side wall water-stopping steel plate (23), and the plate body of the side wall water-stopping steel plate (23) is vertically embedded in each corresponding structural surface of the precast concrete side wall (2).

7. The semi-prefabricated large box culvert structure according to claim 5, characterized in that: The bottom of both ends of the precast concrete partition wall (6) and the side surfaces of the two partition wall protruding bottom beams (62) are half-buried with a ring-shaped partition wall water-stopping steel plate (63) horizontally, and the plate body of the partition wall water-stopping steel plate (63) is vertically embedded in each structural surface of the precast concrete partition wall (6).

8. The semi-prefabricated large box culvert structure according to claim 1, characterized in that: The concrete cushion layer (1) is fully paved with a bottom waterproofing roll material layer (5), the precast concrete side wall (2) is placed on the bottom waterproofing roll material layer (5), the parts of the bottom waterproofing roll material layer (5) extending outside the precast concrete side wall (2) on both sides are turned up and covered on the outer wall of the precast concrete side wall (2), and the cast-in-place bottom plate (3) is cast and formed on the bottom waterproofing roll material layer (5).

9. The semi-prefabricated large box culvert structure according to claim 8, characterized in that: A top waterproofing coiled material layer (51) is laid above the cast-in-place top plate (4), and both sides of the top waterproofing coiled material layer (51) are turned down and wrapped around the outer wall of the precast concrete side wall (2).

10. The semi-prefabricated large box culvert structure according to claim 9, characterized in that: The outer side wall of the cast-in-situ spacer column (24) is vertically provided with a waterproof additional layer (52), and both sides of the waterproof additional layer (52) are attached to the outer wall of the precast concrete side wall (2).

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