Longitudinal socket assembly type box culvert

Abstract

The utility model discloses a longitudinal socket assembly type box culvert, and belongs to the field of highway engineering culvert design. The box culvert comprises a prefabricated cover plate and a prefabricated box culvert body. The prefabricated cover plate comprises an upper-layer plate and a lower-layer plate; the prefabricated box culvert body comprises an outer layer plate and an inner layer plate; the lower-layer plate is located inside the outer-layer plate, the inner-layer plate is located below the lower-layer plate, and the outer-layer plate is located below the upper-layer plate; a splicing seam of the prefabricated cover plate and the prefabricated box culvert body is in a right-angle Z shape; in the longitudinal connecting direction, the upper-layer plate and the lower-layer plate are arranged in a crossed and staggered mode, the inner-layer plate and the outer-layer plate are arranged in a crossed and staggered mode, the end, exceeding the upper-layer plate, of the lower-layer plate is a cover plate inserting end, the other end of the lower-layer plate is a cover plate socket end, the end, exceeding the outer-layer plate, of the inner-layer plate is a box culvert body inserting end, and the other end of the inner-layer plate is a box culvert body socket end. The cover plate inserting end and the box culvert body inserting end are located at the same end to jointly form an inserting end, the cover plate socket end and the box culvert body socket end are located at the same end to jointly form a socket end, and the inserting end and the socket end are matched and connected in a mortise and tenon mode. The longitudinal socket assembly type box culvert is good in waterproofness, high in integrity and excellent in anti-seismic property.

Description

Technical Field

[0001] The utility model belongs to the field of highway engineering culvert design and relates to a longitudinal socket-and-spigot assembly type box culvert. Background Art

[0002] Culverts are a vital component of highway construction, with their primary function being to efficiently drain surface water and river water along the highway, thereby ensuring the stability and safety of the roadbed. However, traditional cast-in-place culvert construction methods have numerous limitations, such as large on-site workloads, complex procedures, low efficiency, and long construction periods. Furthermore, the quality of cast-in-place concrete is susceptible to climate, environmental, and human factors, leading to cracking problems that can affect the safety and durability of the structure. In contrast, prefabricated culverts, with their significant advantages in quality, construction schedule, safety, and environmental friendliness, have gradually become the preferred option within the industry. Prefabricated culverts utilize on-site assembly of prefabricated components, significantly simplifying the construction process, improving work efficiency, and reducing on-site wet work, contributing to improved construction quality and environmental protection.

[0003] However, prefabricated culverts also face a technical challenge: the numerous joints between segments, which can potentially threaten the structural integrity. To address the technical issue of numerous joints in prefabricated culvert segments, the prior art provides a Chinese utility model patent with publication number CN220132760U. This patent describes a prefabricated box culvert socket connection structure, primarily composed of prefabricated box culvert segments, socket beams, and socket openings. The connection is achieved primarily through the socket beams at the front end of the prefabricated box culvert segments and the socket openings at the rear end. The socket openings are used for pouring concrete to enhance the connection strength. This design improves the stability of the connection between segments to a certain extent, but it requires precise alignment of the socket beams and socket openings, and the concrete pouring process further increases the construction difficulty and cost. Furthermore, while pouring concrete to enhance the connection strength, the socket openings also place higher demands on waterproofing. Improper construction or material degradation can lead to water seepage at the joints, compromising the overall waterproofing performance of the box culvert. In some areas requiring high seismic resistance, prefabricated box culvert socket connections may not be specifically designed to enhance seismic resistance. This may threaten the stability and safety of the box culvert structure when natural disasters such as earthquakes occur. In summary, the existing prefabricated box culvert socket connection structure still needs to be further optimized and improved in terms of waterproofness, seismic resistance and structural integrity to meet higher standards of engineering requirements. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a longitudinal socket-and-spigot assembled box culvert, which has good waterproofness, strong integrity and excellent seismic performance.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] The utility model provides a longitudinal socket-and-socket assembled box culvert, comprising a prefabricated cover plate and a prefabricated box culvert body located below the prefabricated cover plate; the prefabricated cover plate comprises an upper plate and a lower plate located below the upper plate; the prefabricated box culvert body comprises an outer plate and an inner plate located inside the outer plate; the lower plate is located inside the outer plate, the inner plate is located below the lower plate, and the outer plate is located below the upper plate; the joint seam between the prefabricated cover plate and the prefabricated box culvert body is in a right-angle Z shape; the joint seam along the longitudinal connection direction is In the direction, the upper plate and the lower plate are cross-staggered and arranged, the inner plate and the outer plate are cross-staggered and arranged, the end of the lower plate extending beyond the upper plate is the cover plate insertion end, and the other end is the cover plate socket end, the end of the inner plate extending beyond the outer plate is the box culvert body insertion end, and the other end is the box culvert body socket end; the cover plate insertion end and the box culvert body insertion end are located at the same end and together constitute the insertion end, the cover plate socket end and the box culvert body socket end are located at the same end and together constitute the socket end, and the insertion end and the socket end cooperate with each other to be connected with mortise and tenon joints.

[0007] In one embodiment, the length of the lower plate extending beyond the upper plate is equal to the length of the inner plate extending beyond the outer plate.

[0008] The total lengths of the plurality of prefabricated cover plates and the plurality of prefabricated box culvert bodies in the box culvert group formed by the plurality of longitudinal socket-and-spigot assembled box culverts are the same.

[0009] In one embodiment, the prefabricated cover plate and the prefabricated box culvert body are arranged in a one-to-one correspondence, and the splicing method between the two is counter-splicing; along the longitudinal connection direction, the cover plate insertion end and the box culvert body insertion end are aligned, and the cover plate socket end and the box culvert body socket end are aligned.

[0010] In one embodiment, the prefabricated cover plate and the prefabricated box culvert body are staggered, and the splicing method between the two is staggered splicing; along the longitudinal connection direction, the cover plate insertion end and the box culvert body insertion end are staggered, and the cover plate socket end and the box culvert body socket end are staggered.

[0011] In one embodiment, the width of the upper plate is greater than the width of the lower plate, and an L-shaped prefabricated cover plate groove opening outward is formed between the lower surface of the portion of the upper plate extending beyond the lower plate and the outer side surface of the lower plate; the height of the outer plate is greater than the height of the inner plate, and an L-shaped prefabricated box culvert body groove opening upward is formed between the inner side surface of the portion of the outer plate protruding above the inner plate and the upper surface of the inner plate; the prefabricated cover plate groove and the prefabricated box culvert body groove are complementary and spliced ​​to form a right-angle Z-shaped splicing seam.

[0012] In one embodiment, the width difference between the upper plate and the lower plate, the height difference between the outer plate and the inner plate, and the thickness of the inner plate are equal.

[0013] In one embodiment, the prefabricated cover plate is provided with a plurality of symmetrically distributed cover plate hoisting structures.

[0014] In one embodiment, the prefabricated box culvert body is prefabricated by two side walls, a bottom plate and two armholes; the two side walls are arranged opposite to each other, the bottom plate is arranged between the two side walls, and the two armholes are respectively arranged at the connection between the two side walls and the bottom plate; a number of symmetrically distributed box culvert body lifting structures are arranged on the bottom plate.

[0015] In one embodiment, the joints between the prefabricated cover plate and the prefabricated box culvert body are grouting treated with high-strength cement mortar; the joints on the water-facing surfaces between several groups of longitudinal socket-type assembled box culverts are painted with epoxy coal tar anti-corrosion paint or epoxy resin paint.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model provides a longitudinal socket-and-spigot assembly-type box culvert, which includes a prefabricated cover plate and a prefabricated box culvert body. By designing the positions of the upper and lower layers and the inner and outer layers, the joints between the two adopt a Z-shaped complementary (inlay) splicing, and the splicing seam is a right-angled Z-shape, which can effectively prevent the upper structure from slipping and dislocating, thereby reducing the risk of water seepage. This structural form increases the contact area, thereby improving the waterproof performance. The prefabricated cover plate and the prefabricated box culvert body are tightly matched, reducing the problem of water seepage caused by loose splicing. The prefabricated cover plate and the prefabricated box culvert body both adopt a cross-staggered arrangement to form the socket end and the insertion end, which enhances the integrity and stability of the structure and is conducive to resisting external forces such as earthquakes. The socket-and-spigot connection between the box culvert segments through the socket end and the insertion end extends the infiltration path and is also an effective measure to improve the waterproof performance. Through the design of the mortise and tenon structure of the socket end and the insertion end, the box culvert not only ensures effective connection between the segments, but also enhances the integrity of the box culvert. The socket connection not only improves the stability of the connection between segments, but also helps to improve the overall bearing capacity and durability of the box culvert.

[0018] Furthermore, the joints between the prefabricated cover plate and the prefabricated box culvert body are in a right-angled Z-shape, which lengthens the path for water penetration and increases the difficulty of water seepage. At the same time, the right-angled Z-shaped joints also help improve the sealing of the joints and prevent water from seeping in through the joints.

[0019] Furthermore, the prefabricated box culvert body utilizes nested, prefabricated outer and inner panels. This multi-layered structure allows the box culvert to disperse and absorb energy through the interaction between the layers when subjected to external forces such as earthquakes, thereby improving its seismic performance. The staggered arrangement of the upper and lower panels, as well as the inner and outer panels, allows the structure to better resist deformation and damage when subjected to horizontal or vertical forces, maintaining structural stability.

[0020] Furthermore, the L-shaped groove design increases the contact area between the prefabricated cover and the prefabricated box culvert body, thereby enhancing the connection strength. This design makes the structure more stable when subjected to external forces, making it less susceptible to displacement or deformation. The right-angled Z-shaped joint effectively distributes stress when the structure is subjected to load, reducing stress concentration and the risk of damage caused by excessive localized stress.

[0021] Furthermore, in order to improve the overall strength and seismic performance of the box culvert, an armpit treatment is added at the junction of the side wall and the bottom plate in the box culvert body. The addition of an armpit angle can enhance the overall stiffness of the structure and improve its stability and safety in natural disasters such as earthquakes.

[0022] Furthermore, asphalt waterproof coating and anti-corrosion coating are applied to the joints to effectively prevent the penetration of moisture and corrosive substances, further enhancing the waterproof performance of the box culvert. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Figures a to d in the middle are schematic diagrams of the overall structure of a longitudinal socket-and-spigot assembled box culvert of the present invention;

[0024] Figure 2 This is a structural diagram of the prefabricated cover plate of the present invention;

[0025] Figure 3 This is a top view of the prefabricated cover plate of the present invention;

[0026] Figure 4 This is a structural diagram of the prefabricated box culvert main body of the utility model;

[0027] Figure 5 This is a top view of the prefabricated box culvert body of the present utility model;

[0028] Figure 6 This is a schematic diagram of the alignment and splicing of the longitudinal socket-and-spigot assembled box culvert of the present invention;

[0029] Figure 7 This is a schematic diagram of the staggered splicing of the longitudinal socket-and-spigot assembled box culvert of the present invention;

[0030] Figure 8 This is a schematic diagram of the complementary connection between the groove of the prefabricated cover plate and the groove of the prefabricated box culvert body of the present invention.

[0031] Among them: 1-prefabricated cover plate; 2-prefabricated box culvert body; 3-prefabricated cover plate groove; 4-prefabricated box culvert body groove; 5-socket end; 6-insertion end; 6-1-cover plate insertion end; 6-2-box culvert body insertion end; 7-cover plate lifting structure; 8-box culvert body lifting structure; 9-axillary angle. DETAILED DESCRIPTION

[0032] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] The present invention is described in further detail below with reference to the accompanying drawings:

[0035] See also Figure 1 As shown in Figures a to d, the utility model provides a longitudinal socket-and-spigot assembled box culvert, which is mainly composed of two parts: a prefabricated cover plate 1 and a prefabricated box culvert body 2. The prefabricated box culvert body 2 is located below the prefabricated cover plate 1. The prefabricated cover plate 1 and the prefabricated box culvert body 2 are spliced ​​together, and the splicing seam between the two is a right-angle Z shape.

[0036] like Figures 2 to 5 As shown, the prefabricated cover plate 1 is prefabricated by stacking upper and lower plates, and the prefabricated box culvert body 2 includes outer and inner plates that are nested and prefabricated as a whole. The lower plate is embedded in the outer plate, and the inner plate is located below the lower plate. The outer edges of the outer plate and the upper plate are aligned, and the outer plate is located below the upper plate. The joint between the prefabricated cover plate 1 and the prefabricated box culvert body 2 forms a right-angled Z-shaped seam. When connected longitudinally, the upper and lower plates and the inner and outer plates are arranged in a staggered manner. Among them, the end of the lower plate that extends beyond the upper plate is designed as the cover plate insertion end 6-1, and the other end is the socket end; similarly, the end of the inner plate that extends beyond the outer plate is designed as the box culvert body insertion end 6-2, and the other end is the socket end. The insertion end 6 and the socket end 5 are respectively located on both sides of the box culvert. When connected, the insertion end 6 and the socket end 5 can match each other to achieve a mortise and tenon connection. The length of the lower plate extending beyond the upper plate is equal to the length of the inner plate extending beyond the outer plate.

[0037] Furthermore, the thickness of the inner and outer layers of the prefabricated box culvert body is basically the same, avoiding the local crushing phenomenon caused by the large difference in structural stiffness. The width of the upper plate is greater than the width of the lower plate, and the height of the outer plate is greater than the height of the inner plate. The prefabricated cover plate 1 and the prefabricated box culvert body 2 are connected by the prefabricated cover plate groove 3 and the prefabricated box culvert body groove 4 to form a right-angle Z-shaped joint. Figure 8 The prefabricated cover plate groove 3 is an L-shaped groove with an outward opening formed between the lower surface of the portion of the upper plate that exceeds the lower plate and the outer side surface of the lower plate, and the prefabricated box culvert body groove 4 is an L-shaped groove with an upward opening formed between the inner side surface of the portion of the outer plate that exceeds the inner plate and the upper surface of the inner plate.

[0038] Furthermore, the width difference between the upper and lower plates, the height difference between the outer and inner plates, and the thickness of the inner plate are equal. Figure 1 and Figure 8 As shown, the prefabricated cover plate groove 3 and the prefabricated box culvert body groove 4 are embedded in each other, forming a right-angle Z-shape complement at the upper and lower joints of the prefabricated cover plate 1 and the prefabricated box culvert body 2, and the upper width, vertical height and lower width of the right-angle Z-shape are all equal.

[0039] In one embodiment, the prefabricated cover panels 1 and prefabricated culvert bodies 2 in a box culvert assembly comprised of a plurality of longitudinally socket-assembled box culverts have the same total length. The prefabricated cover panels 1 and prefabricated culvert bodies 2 in a standard culvert section are of the same length (the prefabricated cover panels 1 and prefabricated culvert bodies 2 can be spliced ​​one-to-one or staggered). Furthermore, the prefabricated cover panels 1 can be lengthened or shortened to ensure that the total length of the prefabricated cover panels and prefabricated U-shaped structure is the same after splicing.

[0040] like Figure 6 As shown, the prefabricated cover plate 1 and the prefabricated box culvert body 2 are arranged in a one-to-one correspondence, and the splicing method between the two is counter-splicing; along the longitudinal connection direction, the cover plate insertion end 6-1 and the box culvert body insertion end 6-2 are aligned, and the cover plate socket end and the box culvert body socket end are aligned.

[0041] like Figure 7 As shown, the prefabricated cover plate 1 and the prefabricated box culvert body 2 are staggered, and the splicing method between the two is staggered splicing; along the longitudinal connection direction, the cover plate insertion end 6-1 and the box culvert body insertion end 6-2 are staggered, and the cover plate socket end and the box culvert body socket end are staggered.

[0042] Furthermore, the culvert structure is divided into two parts, the upper part is a top plate prefabricated separately, and the lower part is prefabricated into a U-shaped structure by two side walls, a bottom plate and two arms, namely the prefabricated box culvert body 2. The upper and lower joints on the left and right sides are in a right-angle Z shape. The dimensions of the Z-shaped joints (upper width, lower width and height) are all 0.15m, and are symmetrically arranged on the left and right.

[0043] Specifically, the prefabricated box culvert body 2 is prefabricated by two side walls, a bottom plate and two armpits; the two side walls are arranged opposite to each other, the bottom plate is arranged between the two side walls, and the two armpits are respectively arranged at the connection between the two side walls and the bottom plate; a number of symmetrically distributed box culvert body lifting structures 8 are arranged on the bottom plate.

[0044] Furthermore, hoisting structures are symmetrically arranged on the prefabricated cover plate 1 and the prefabricated box culvert body 2, namely the cover plate hoisting structure 7 and the box culvert body hoisting structure 8, and are arranged at the position where the structure is subjected to the least stress. Specifically, four pre-embedded U-shaped bolts or pre-embedded lifting rings are symmetrically arranged at 0.5m from the left and right sides and the front and rear ends of the prefabricated cover plate 1 as the cover plate hoisting structure 7, the pre-embedded ends of which are fixed to the bottom of the steel skeleton, and the U-shaped lifting rings extend outwards above the structural layer. Four pre-embedded U-shaped bolts or pre-embedded lifting rings are symmetrically arranged at 0.5m from the left and right sides and the front and rear ends of the prefabricated box culvert body 2 as the box culvert body hoisting structure 8, the pre-embedded ends are fixed to the bottom of the steel skeleton, and the U-shaped lifting rings extend outwards above the structural layer.

[0045] Furthermore, under the same stress conditions, the box culvert structure has a small cross-sectional area, which saves materials and is convenient for lifting, transportation and construction.

[0046] To facilitate installation, Figure 2 and 3 As shown, the prefabricated cover plate 1 is provided with a plurality of symmetrically distributed cover plate hoisting structures 7, such as Figure 4 and Figure 5 As shown, a corresponding box culvert main body hoisting structure 8 is also configured on the bottom plate of the prefabricated box culvert main body 2 to ensure the safety and efficiency of the hoisting operation.

[0047] Furthermore, the joints between the prefabricated cover plate 1 and the prefabricated box culvert body 2 are grouting treated with high-strength cement mortar; the joints on the water-facing surfaces between several groups of longitudinal socket-and-spigot assembled box culverts are painted with epoxy coal tar anti-corrosion paint or epoxy resin paint.

[0048] In summary, the utility model provides a longitudinal socket-and-spigot assembled box culvert, which significantly simplifies the construction process by prefabricating the cover plate and the box culvert body separately and performing alignment or staggered splicing on site. At the same time, the design of the right-angled Z-shaped complementary (inlay) structure on the prefabricated cover plate 1 and the prefabricated box culvert body 2, and the mortise and tenon structure of the socket end 5 and the insertion end 6 makes the connection between the segments easier and reduces the need for precise alignment. The design of the right-angled Z-shaped complementary (inlay) structure at the joint of the prefabricated cover plate 1 and the prefabricated box culvert body 2 can effectively prevent the upper structure from slipping and dislocating, thereby reducing the risk of water seepage. The socket-and-spigot connection between the box culvert segments extends the infiltration path and is also an effective measure to improve the waterproof performance. Through the design of the mortise and tenon structure of the socket end 5 and the insertion end 6, the box culvert not only ensures the effective connection between the segments, but also enhances the integrity of the box culvert. The socket-and-spigot connection not only improves the stability of the connection between the segments, but also helps to improve the overall bearing capacity and durability of the box culvert.

[0049] In one embodiment, a longitudinally assembled box culvert with spigot-and-socket joints is provided, comprising a prefabricated cover plate 1 and a prefabricated U-shaped structure, namely, a prefabricated box culvert body 2. The cover plate is prefabricated separately as the structural top plate, while the prefabricated box culvert body 2 is integrally prefabricated, comprising two side walls, a bottom plate, and two abutments. At the joint between the upper prefabricated cover plate 1 and the lower prefabricated box culvert body 2 (i.e., the top of the side walls), a right-angled Z-shaped complementary (inlaid) structure is formed, consisting of a groove 3 in the prefabricated cover plate and a groove 4 in the prefabricated box culvert body, to prevent structural slippage and misalignment. A mortise and tenon joint structure is configured between the culvert segments, with an insert end 6 (the tongue-and-groove end) on one side and a spigot end 5 (the groove-and-groove end) on the other side, along the cross-sectional direction, to enhance the culvert's waterproofing performance and improve the overall structural stability.

[0050] The design of the prefabricated cover plate 1 is as follows:

[0051] The prefabricated cover plate 1 is prefabricated as a whole by stacking two layers of rectangular structures, and along the width direction, the width of the upper rectangular structure is greater than the width of the lower rectangular structure. The upper and lower layers are symmetrically arranged to ensure that the left and right sides are symmetrical convex right-angled Z-shaped, namely the prefabricated cover plate groove 3; along the length direction, the upper and lower layers are cross-staggered by 0.2m to ensure that the sockets and splices are reserved at the front and back ends, namely the cover plate socket end and the cover plate insertion end 6-1 respectively. The upper and lower rectangular structures are prefabricated as a whole by stacking.

[0052] Prefabricated cover plate 1 is 3.2m long (effective length 3.0m), 3.0m wide, and 0.35m thick. The upper rectangular layer is 3.0m long, 3.0m wide, and 0.2m thick; the lower rectangular layer is 3.0m long, 2.7m wide, and 0.15m thick. Along the length, the upper and lower layers are offset by 0.2m. The upper and lower rectangular structures are prefabricated as a whole, overlapping structure.

[0053] Four embedded U-shaped bolts or embedded lifting rings are symmetrically set at 0.5m on both sides and front and back ends of the prefabricated cover plate 1 as the cover plate lifting structure 7, the embedded ends of which are fixed to the bottom of the steel frame, and the U-shaped lifting rings extend above the structural layer.

[0054] The design of prefabricated box culvert body 2 (U-shaped structure) is as follows:

[0055] The prefabricated box culvert body 2 is prefabricated as a whole by two side walls, a bottom plate and two abutments. The prefabricated box culvert body 2 is prefabricated as a whole by the inner layer plate and the outer layer plate. The height of the inner layer plate is less than the height of the outer layer plate. The prefabricated box culvert body 2 is a concave structure. The inner layer plate and the outer layer plate in the prefabricated box culvert body 2 are both U-shaped structures.

[0056] The prefabricated box culvert body 2 is 3.2m long (effective length 3.0m), 3.0m wide, and the side walls and bottom slab are both 0.3m thick. To improve the overall strength and seismic performance of the box culvert, a gusset is added at the junction of the side walls and bottom slab. The gusset angle 9 is 0.3m wide and 0.3m high.

[0057] The tops of the left and right side walls of the prefabricated box culvert body 2 are symmetrically arranged into a concave right-angled Z-shape, namely the prefabricated box culvert body groove 4. The upper width, lower width and height of the Z-shape are all 0.15m. The prefabricated box culvert body groove 4 is complementary to the prefabricated cover plate groove 3 on the above-mentioned prefabricated cover plate 1 to avoid slippage and dislocation of the upper structure.

[0058] like Figure 8 As shown, the prefabricated box culvert body 2 can be considered as a two-layer "concave" structure with an inner and outer layer, and there is a difference in height between the inner and outer layers. The height of the inner layer in the prefabricated box culvert body 2 is lower than that of the outer layer. Among them, it is divided into two equal parts along the thickness direction of the side walls and the bottom plate. The outer side of the two side walls and the outer side of the bottom plate are the outer "concave" structure, and the inner side of the two side walls, the inner side of the bottom plate and the two added arms are the inner "concave" structure. Along the length direction, the inner and outer layers are staggered by 0.2m to ensure that the reserved sockets and spigots at the front and back ends are the box culvert body socket end and the box culvert body insertion end 6-2 respectively. The inner and outer "concave" structures are prefabricated as a whole by overlapping.

[0059] On the prefabricated box culvert body 2, four embedded U-shaped bolts or embedded lifting rings are symmetrically arranged at 0.5m on the left and right sides and the front and rear ends of the bottom plate as the box culvert body lifting structure 8. The embedded ends are fixed to the bottom of the steel frame, and the U-shaped lifting rings extend above the structural layer.

[0060] The cover plate insertion end 6-1 and the box culvert body insertion end 6-2 are located at the same end and together constitute the insertion end 6, the cover plate socket end and the box culvert body socket end are located at the same end and together constitute the socket end 5, and the insertion end 6 and the socket end 5 are connected in a mortise and tenon structure.

[0061] Preferably, Figure 1 Middle Figure d and Figure 8 As shown, overall, the standard segment of the box culvert is 3.2 m long (the effective length of the standard culvert segment is 3.0 m), 3.0 m wide (the net width is 2.4 m), and 3.0 m high (the net height is 2.35 m). The thickness of the top plate is 0.35 m, and the thicknesses of the side walls and the bottom plate are both 0.3 m. Reinforced sections are provided at the two bottom corners of the precast box culvert body 2, with the width of the reinforced corner being 0.3 m and the height being 0.3 m. The insertion end 6 of the box culvert is 0.2 m long, and the thicknesses are all 0.15 m (excluding the dimensions of the reinforced section), presenting a "square" shape; the socket end 5 is 0.2 m long, with the top thickness being 0.2 m, and the thicknesses of both sides and the bottom being 0.15 m, presenting a "doubled square" shape. The upper and lower joints of the precast cover groove 3 and the precast box culvert body groove 4 are in a right-angled Z shape, and the dimensions of the Z-shaped joint (upper width, lower width, and height) are all 0.15 m, symmetrically arranged left and right.

[0062] Preferably, four fixed lifting bolts are symmetrically arranged at the bottom plates of the precast cover 1 and the precast box culvert body 2 respectively as the cover lifting structure 7 and the box culvert main body lifting structure 8 to ensure uniform stress of the culvert structure during lifting and installation.

[0063] Preferably, no socket or spigot is provided at the non-connected ends of the first and last segments of the box culvert (flush joint treatment). In the standard segment of the box culvert, the lengths of the precast cover 1 and the precast box culvert body 2 are the same. In the box culvert group composed of several longitudinally socket-assembled box culverts, the total lengths of several precast covers 1 and several precast box culvert bodies 2 are the same, and there are two splicing methods: alignment splicing, that is, the precast cover 1 and the precast box culvert body 2 correspond one by one; along the longitudinal connection direction, the cover insertion end 6-1 and the box culvert main body insertion end 6-2 are aligned, and the cover socket end and the box culvert main body socket end are aligned; misaligned splicing means that the precast cover 1 and the precast box culvert body 2 are misaligned; along the longitudinal connection direction, the cover insertion end 6-1 and the box culvert main body insertion end 6-2 are misaligned, and the cover socket end and the box culvert main body socket end are misaligned.

[0064] Optionally, the lengths of the precast cover 1 and the precast box culvert body 2 are not the same (that is, the precast cover 1 is lengthened or shortened, and the precast cover 1 and the precast box culvert body 2 do not correspond one by one), as long as the total length is the same after the splicing of the precast cover 1 and the precast box culvert body 2 is completed.

[0065] Such as Figure 6 and Figure 7As shown, the above-mentioned prefabricated cover plate 1 and prefabricated box culvert body 2 can be spliced ​​in opposite positions or staggered, both of which can meet the requirements of the socket-type connection between the box culvert segments. During the on-site assembly process, all joints must be waterproofed and reinforced. After the assembly is completed, anti-corrosion treatment is performed. The joints between the prefabricated cover plate groove 3 and the prefabricated box culvert body groove 4 in the longitudinal socket-type assembled box culvert and between several groups of longitudinal socket-type assembled box culverts are all painted with asphalt waterproof coating and anti-corrosion coating. Specifically, the joints between the prefabricated cover plate 1 and the prefabricated box culvert body 2 are grouting with high-strength cement mortar; the joints on the water-facing surfaces of several groups of longitudinal socket-type assembled box culverts are painted with epoxy coal tar anti-corrosion paint or epoxy resin coating.

[0066] like Figure 1 The figure shows a longitudinally assembled box culvert with spigots and sockets, comprising a prefabricated cover plate 1 and a prefabricated box culvert body 2. At the upper and lower joints, complementary grooves 3 in the prefabricated cover plate and 4 in the prefabricated box culvert body are formed at right angles. The Z-shaped dimensions are: 0.15m in width at the top, 0.15m in height, and 0.15m in width at the bottom. The recessed portion on one side of the culvert serves as the spigot end 5, while the protruding portion on the other side serves as the insertion end 6. To ensure a tight and secure connection between the culvert segments, the insertion end 5 must be fully embedded in the spigot end 6, leaving no excess.

[0067] like Figure 2 and Figure 3 As shown, four embedded U-bolts (or embedded lifting rings) are symmetrically placed above the precast cover 1. Each embedded U-bolt is 0.5m away from the concrete edge to ensure that the precast cover 1 is evenly stressed during the lifting process. If the precast cover 1 is lengthened, additional embedded U-bolts can be added symmetrically.

[0068] like Figure 4 and Figure 5 As shown, four embedded U-bolts (or embedded lifting rings) are also symmetrically placed above the base plate of the prefabricated box culvert body 2. Each embedded U-bolt is 0.5m from the concrete edge of the insertion end 6 or the socket end 5 and 0.2m from the bottom corner. Due to the heavy weight of the prefabricated U-shaped structure, additional embedded U-bolts can be added symmetrically as needed to reduce the impact of stress concentration.

[0069] like Figure 6 and Figure 7 As shown, during the construction process, the prefabricated box culvert body 2 is first assembled. To ensure that there are no gaps between the box culvert segments, high-strength cement mortar is applied to the joints before hoisting. After the joints are completed, they are compacted. This process is continued before the mortar solidifies, completing the assembly of the upper prefabricated cover plate 1. After the overall installation is complete, all joints are coated with asphalt waterproofing and anti-corrosion coatings. Depending on the actual project needs, the prefabricated cover plate 1 and prefabricated box culvert body 2 can be aligned vertically or staggered.

[0070] The longitudinal socket-and-spigot assembled box culvert provided in this embodiment can effectively avoid slippage and dislocation of the upper structure by performing a Z-shaped complementary (inlaying) design on the prefabricated cover plate 1 and the prefabricated box culvert body 2; the overall stiffness and seismic resistance of the box culvert are improved by adding the armpit corners 9; the socket and the spigot are provided for socket-and-spigot connection, which can ensure effective connection between the box culvert segments and thus improve the overall stability of the box culvert; the socket-and-spigot connection between the box culvert segments can also extend the infiltration path, thereby greatly improving the waterproof performance of the box culvert.

[0071] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A longitudinal socket-and-spigot assembled box culvert, characterized in that: The invention comprises a prefabricated cover plate (1) and a prefabricated box culvert body (2) located below the prefabricated cover plate (1); the prefabricated cover plate (1) comprises an upper plate and a lower plate which are stacked and prefabricated as one; the prefabricated box culvert body (2) comprises an outer plate and an inner plate which are nested and prefabricated as one; the lower plate is located inside the outer plate, the inner plate is located below the lower plate, and the outer plate is located below the upper plate; the joint between the prefabricated cover plate (1) and the prefabricated box culvert body (2) is in a right-angle Z shape; along the longitudinal connection direction, the upper plate and the lower plate are arranged in a cross-staggered manner. The inner plate and the outer plate are arranged in a staggered manner, one end of the lower plate extending beyond the upper plate is the cover plate insertion end (6-1), and the other end is the cover plate socket end; one end of the inner plate extending beyond the outer plate is the box culvert body insertion end (6-2), and the other end is the box culvert body socket end; the cover plate insertion end (6-1) and the box culvert body insertion end (6-2) are located at the same end and together constitute the insertion end (6); the cover plate socket end and the box culvert body socket end are located at the same end and together constitute the socket end (5); the insertion end (6) and the socket end (5) are connected by mutual mortise and tenon joints.

2. The longitudinal socket-and-spigot assembled box culvert according to claim 1, characterized in that: The length of the lower plate extending beyond the upper plate is equal to the length of the inner plate extending beyond the outer plate.

3. The longitudinal socket-and-spigot assembled box culvert according to claim 1, characterized in that: The total lengths of the plurality of prefabricated cover plates (1) and the plurality of prefabricated box culvert bodies (2) in the box culvert group formed by the plurality of longitudinal socket-and-spigot assembled box culverts are the same.

4. The longitudinal socket-and-spigot assembled box culvert according to claim 3, characterized in that: The prefabricated cover plate (1) and the prefabricated box culvert body (2) are arranged in a one-to-one correspondence, and the splicing method between the two is alignment splicing; along the longitudinal connection direction, the cover plate insertion end (6-1) and the box culvert body insertion end (6-2) are aligned, and the cover plate socket end and the box culvert body socket end are aligned.

5. The longitudinal socket-and-spigot assembled box culvert according to claim 3, characterized in that: The prefabricated cover plate (1) and the prefabricated box culvert body (2) are staggered, and the splicing method between the two is staggered splicing; along the longitudinal connection direction, the cover plate insertion end (6-1) and the box culvert body insertion end (6-2) are staggered, and the cover plate socket end and the box culvert body socket end are staggered.

6. The longitudinal socket-and-spigot assembled box culvert according to claim 1, characterized in that: The width of the upper plate is greater than that of the lower plate, and an L-shaped prefabricated cover plate groove (3) opening outward is formed between the lower surface of the portion of the upper plate exceeding the lower plate and the outer side surface of the lower plate; the height of the outer plate is greater than that of the inner plate, and an L-shaped prefabricated box culvert body groove (4) opening upward is formed between the inner side surface of the portion of the outer plate exceeding the inner plate and the upper surface of the inner plate; the prefabricated cover plate groove (3) and the prefabricated box culvert body groove (4) are complementary and spliced ​​to form a right-angled Z-shaped splicing seam; the width difference between the upper plate and the lower plate, the height difference between the outer plate and the inner plate, and the thickness of the inner plate are equal.

7. The longitudinal socket-and-spigot assembled box culvert according to claim 1, characterized in that: The prefabricated cover plate (1) is provided with a plurality of symmetrically distributed cover plate hoisting structures (7).

8. The longitudinal socket-and-spigot assembled box culvert according to claim 1, characterized in that: The prefabricated box culvert body (2) is prefabricated from two side walls, a bottom plate and two haunches; The two side walls are arranged opposite to each other, the bottom plate is arranged between the two side walls, and the two haunches are respectively arranged at the connection between the two side walls and the bottom plate.

9. The longitudinal socket-and-spigot assembled box culvert according to claim 8, characterized in that: A plurality of symmetrically distributed box culvert main body hoisting structures (8) are provided on the bottom plate.

10. The longitudinal socket-and-spigot assembled box culvert according to claim 1, characterized in that: The joints between the prefabricated cover plate (1) and the prefabricated box culvert body (2) are grouting treated with high-strength cement mortar; The joints on the water-facing surfaces between several groups of longitudinal socket-and-spigot assembled box culverts are painted with epoxy coal tar anti-corrosion paint or epoxy resin paint.

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