Fabricated box culvert with double-tooth cover plate

Abstract

The utility model relates to the technical field of municipal road engineering culvert construction, and discloses an assembly type box culvert with a double-tooth cover plate, which comprises an assembly type box culvert body and a cast-in-place bottom plate, the box culvert body is composed of a top plate and two wing side plates, the lower part of the top plate is provided with a trapezoidal plate tooth structure which is used for being connected with side walls and is in bilateral symmetry, and the two wing side plates are arranged on the lower part of the trapezoidal plate tooth structure. Four reserved fixed hoisting bolts used for hoisting construction are arranged on the upper portion of the top plate, polygonal supporting feet which have the vertical supporting effect and are connected with a bottom cast-in-place slab are arranged at the bottoms of the side plates, prefabricated extending steel bars on the inner sides of the supporting feet are connected with cast-in-place concrete, cast-in-place is conducted on the concrete bottom plate before hoisting construction is completed, and longitudinal connection stability is guaranteed. The fabricated box culvert cover plate is provided with the preformed holes and the plate tooth structures, it is guaranteed that the cover plate is evenly stressed in the hoisting process, the cover plate is firmly connected with the two wing side plates, transverse displacement of the side plates is limited, and the box culvert is prevented from being damaged or losing the mechanical property in the construction and service process.

Description

Technical Field

[0001] The utility model relates to the technical field of culvert construction in municipal road engineering, in particular to an assembled box culvert with a double-tooth cover plate. Background Art

[0002] A box culvert is a culvert constructed with reinforced concrete box-shaped pipe sections. It consists of one or more square or rectangular sections, typically made of reinforced concrete or masonry, though reinforced concrete is more widely used. Box culverts are used when the span is less than 4m. Reinforced concrete box culverts are a cheaper alternative to pipe culverts, with the piers, upper and lower plates all cast uniformly. Box culvert construction generally uses cast-in-place construction. A base layer is set in an excavated trench, a concrete cushion is poured, and the processed steel bars are then tied on-site, with the inner and outer formwork supported. Larger box culverts generally begin with the bottom plate and the lower half of the side walls, followed by the upper side wall and top plate reinforcement. The inner and outer formwork are then supported, and the upper half of the side walls and top plate are cast. Once the concrete reaches the design strength, the formwork is removed, and soil is backfilled simultaneously on both sides of the box culvert.

[0003] Prefabricated precast concrete box culverts, a type of box culvert structure, play a vital role in modern highway development due to their advantages, including structural safety and durability, low maintenance costs, and ease of construction. Prefabricated box culverts, also known as modular box culverts, are prefabricated reinforced concrete box structures. They offer a rapid construction process, featuring factory prefabrication and on-site assembly. They are primarily used in projects requiring a short construction period. For projects requiring a short construction period, the use of prefabricated box culverts can significantly shorten the construction period. Because they use prefabricated components, they are not restricted by weather conditions and can be completed during optimal times. To reduce the weight of prefabricated box culverts, portions of the base plate are not prefabricated, and the box culvert components are designed as open structures. The modular prefabrication of prefabricated concrete box culverts reduces component weight, simplifies transportation and installation, shortens construction time, reduces traffic disruptions, promotes civilized and green construction, and ultimately ensures that construction is completed on schedule. With technological advancements and innovations, prefabricated concrete box culverts are expected to have significant growth potential in my country's highway construction and will play an increasingly important role in highway engineering. By making reasonable size plans, improving the integration of prefabrication and assembly, and developing mature lifting methods, the widespread application of prefabricated concrete components in actual engineering will be promoted.

[0004] However, during the construction and operation of conventional prefabricated box culverts, unstable connections between the cover and side walls can lead to uneven settlement or inward tilting of the side walls. This can also cause damage to the culvert's corners, increasing repair costs and compromising its appearance. Therefore, those skilled in the art are in urgent need of a prefabricated cover box culvert structure with a simple structure, an excellent stress-bearing pattern, and stable connection performance. Utility Model Content

[0005] In response to the above problems, the purpose of the present invention is to provide an assembled cover box culvert structure that meets the bearing capacity requirements, has good compressive and shear mechanical properties and anti-deformation ability, and is suitable for construction and workability.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A prefabricated box culvert with a double-tooth cover plate comprises a top plate, two wing side plates and a cast-in-place bottom plate; the lower surface of the top plate is provided with two left-right symmetrical trapezoidal tooth plates, the trapezoidal tooth plates have straight walls and inclined walls, and the upper surface of the top plate is provided with hanging bolts; the two wing side plates are installed below the top plate, the tops of the two wing side plates are abutted against the lower surface of the top plate, the upper side walls of the two wing side plates are abutted against the straight walls of the trapezoidal tooth plate structure, and the lower parts of the two wing side plates are further provided with support legs integrally formed with the two wing side plates, and the reserved steel bars prefabricated and extended from the inner sides of the support legs are connected to the cast-in-place bottom plate; the two wing side plates are placed on the foundation, and cast-in-place concrete is poured at the position of the cast-in-place bottom plate to form the cast-in-place bottom plate.

[0008] The plate teeth are designed with 45° inclined "axils," which function like the axil angles in conventional concrete structures. This effectively enhances the structural stability, preventing deformation or displacement under lateral pressure. It also disperses and absorbs pressure from above, thereby improving the structure's load-bearing capacity and preventing cracks. The "axils" also optimize the overall structural layout, making the overall structure more rational and efficient.

[0009] The top plate is a reinforced concrete slab structure of uniform cross-section. The distance between the two straight walls of the symmetrically distributed trapezoidal tooth plates is no greater than the difference between the top plate's lateral width L and twice the thickness H of the two wing side plates. A symmetrical trapezoidal plate tooth structure is provided at the bottom of the top plate. In some embodiments, the top plate has a lateral width of 3.0m, a longitudinal length of 3.0m, a thickness of 0.3m, and a plate tooth width of 0.3m to 0.5m. This increases the contact area between the top plate and the side walls, strengthening the bond between the two sides. It also constrains lateral displacement of the side walls, preventing culvert connection failure caused by lateral fill pressure and inward overturning of the side walls. It also enhances the seismic resistance of the culvert and ensures the overall stability of the box culvert.

[0010] The extended length of the reserved steel bars is 1 / 5 to 1 / 2 of the transverse width of the cast-in-place base plate.

[0011] Preferably, there are two or more symmetrically arranged lifting bolts on the top plate surface, and they are pre-installed in the steel frame of the top plate before casting the top plate body. After casting the plate body, a ring-shaped bolt structure is formed that extends out of the plate body and is used for lifting the cover plate. This ensures that the top plate is lifted evenly and stably during the lifting process, preventing large stress concentration and damage to the cover plate structure.

[0012] Further preferably, there are four lifting bolts, which are located directly above the tooth plate structure, and the four lifting bolts are respectively located at the upper left corner, lower left corner, upper right corner and lower right corner of the top plate. Each lifting bolt is 0.4m away from the left and right sides of the top plate edge to which it is adjacent, and 0.5m away from the front and rear ends in the longitudinal direction.

[0013] The longitudinal sections of the two wing side panels are in the shape of an inverted T, the upper section is a regular rectangular structure, and the lower section is a polygonal support structure.

[0014] In some embodiments of the present invention, the side panels have a transverse thickness of 0.3m, a longitudinal length of 3.0m, and a vertical height of 2.7m. Bracing feet are provided at both ends of the bottom of the side panels to enhance the upright stability of the culvert during construction, increase the contact area between the culvert and the foundation, and prevent the side walls from toppling or settling during hoisting and filling.

[0015] The cast-in-place baseplate is a reinforced concrete structure. It is poured after the side panels are installed and before the top panel is hoisted and installed. Alternatively, the side panels can be installed first, followed by the top panel, and the baseplate can be poured manually by inserting pipes.

[0016] The multi-segment longitudinal connection between the top panel and the two side panels is a staggered cover plate. This means that a single top panel is suspended at the connection point between the two side walls, so that the longitudinal midpoint of the top panel coincides with the seam between the two side walls, further enhancing the stability of the longitudinal connection of the prefabricated box culvert. In some embodiments of the present invention, the connection between the top panel and the side panels is not a simple straight-line connection, but rather a staggered connection. This connection method: first, enhances the overall stability and load-bearing capacity of the structure by reducing stress concentration through the staggered connection; second, facilitates installation and disassembly, making the connection between the segments more flexible; third, in terms of waterproofing and sealing, the staggered design improves the sealing performance of the box culvert.

[0017] The beneficial effects of the assembled box culvert with double-tooth cover plates of the utility model are:

[0018] By setting a plate tooth structure on the prefabricated box culvert, the contact area between the top plate and the side wall is increased, making the bonding between the two sides stronger, and restraining the lateral displacement of the two side walls, preventing the culvert connection from failing due to lateral fill pressure and the side walls from tipping inward, while also increasing the seismic performance of the culvert. By setting reserved fixed lifting bolts for cover plate lifting, the top plate is lifted evenly and stably during the lifting process, preventing large stress concentration and damage to the cover plate structure. By setting a support structure, the upright stability of the culvert during construction is increased, the contact area between the culvert and the foundation soil is increased, and the side walls are prevented from tipping over or settling during lifting and filling. Furthermore, the top plate and side plates of the box culvert are overlapped by staggered cover plates to enhance the overall stability and bearing capacity of the structure, and reduce stress concentration through staggered connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the top plate teeth and reserved fixing bolts of the utility model;

[0021] Figure 3 This is a schematic diagram of the side panel of the utility model;

[0022] Figure 4 This is a schematic diagram of the staggered cover plate of the utility model;

[0023] Figure 5 This is a schematic diagram of the construction and hoisting of this utility model;

[0024] Among them, 1-top plate, 2-tooth plate, 21-left tooth plate, 22-right tooth plate, 3-side wing plates, 31-left plate, 32-right plate, 4-lifting bolts, 5-support feet, 51-left plate support feet, 52-right plate support feet, 53-reserved steel bars; 6-cast-in-place bottom plate. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] The present invention is described in further detail below with reference to the accompanying drawings:

[0028] Example 1

[0029] like Figures 1 to 4 The figure shows a specific assembled box culvert with double tooth cover plate designed by the present invention, including assembled box culvert body and cast-in-place bottom plate. The box culvert body is composed of top plate 1 and two side plates 3. The lower part of the top plate 1 is provided with a left-right symmetrical trapezoidal plate tooth structure 2 for connecting with the side wall. Figure 2 As shown, the top plate 1 is provided with 4 reserved fixing bolts 4 for hoisting construction, and the bottom of the side plate 3 is provided with a polygonal support foot 5 for vertical support and connection with the bottom cast-in-place plate 6. Figure 3 As shown, the prefabricated steel bars 53 extending from the inner side of the support leg 5 are connected to the cast-in-place concrete, and the cast-in-place concrete forms the cast-in-place base plate 6.

[0030] The roof panel 1 has a transverse width of 3.0 m and a longitudinal length of 3.0 m. The height of the roof panel sidewall 11 , that is, the thickness of the roof panel 1 , is 0.3 m.

[0031] The lower part of the top plate 1 is provided with bilaterally symmetrical trapezoidal plate teeth 2, including a left tooth plate 21 and a right tooth plate 22. The width of the plate teeth 2, that is, the distance between the two parallel surfaces of the trapezoidal tooth plates, is 0.3m.

[0032] At the upper part of the top plate 1, 0.4m away from the left and right sides in the horizontal direction and 0.5m away from the front and rear ends in the longitudinal direction, 4 reserved fixed lifting bolts 4 for lifting construction are set just above the lower plate tooth structure.

[0033] The two wing side panels 3 are uniform cross-section reinforced concrete slab structures with a transverse thickness of 0.3m, a longitudinal length of 3.0m, and a vertical height of 2.7m. The upper cross-section is a regular rectangular structure, and the lower cross-section is a polygonal support structure 5. The left side panel 31 and the right side panel 32 of the two wing side panels 3 are both in an inverted T shape as a whole.

[0034] The support legs 5 include a left support leg 51 of the left side plate 31 and a right support leg 52 of the right side plate 32. A horizontal straight steel bar extends from the inner side of the support legs 5. Figure 3 As shown, the reserved steel bars 53 of the left support leg extend into the interior of the cast-in-place base plate 6. After cement is poured at the bottom to form the cast-in-place base plate 6, the connection with the bottom cast-in-place concrete base plate 6 is strengthened. The length of the reserved steel bars 53 is 0.2 times the horizontal width of the cast-in-place base plate 6.

[0035] The multi-segment longitudinal connection between the top plate 1 and the side plate 3 is a staggered cover plate, such as Figure 4 shown.

[0036] Example 2

[0037] The utility model is designed to provide a specific assembled box culvert with a double-tooth cover plate, comprising a top plate 1, two wing side plates 3 and a cast-in-place bottom plate 6;

[0038] The lower surface of the top plate 1 is provided with two trapezoidal tooth plates 2 that are symmetrical on both sides. The tooth plates 2 include a left tooth plate 21 and a right side plate 22. The tooth plates 2 have straight walls and inclined walls. The upper surface of the top plate is provided with hanging bolts 4.

[0039] The two wing side panels 3 include a left side panel 31 and a right side panel 32 installed below the top panel 1. The top of the two wing side panels 3 abuts against the lower surface of the top panel. The upper side walls of the two wing side panels 3 are as shown in FIG. Figure 3 As shown, the inner wall 331 of the left side wall abuts against the straight wall of the trapezoidal tooth plate structure 21;

[0040] The lower part of the two wing side panels 3 is further provided with a support foot 5 integrally formed with the two wing side panels 3, the left side wall 31 corresponds to the left support foot 51, and the right side wall 32 corresponds to the right support foot 52;

[0041] The prefabricated reserved steel bars 53 extending from the inner side of the support leg 5 are connected to the cast-in-place bottom plate 6; the two wing side plates 3 are placed on the foundation, and cast-in-place concrete is poured at the position of the cast-in-place bottom plate 6 to form a cast-in-place bottom plate.

[0042] The top plate 1 is a reinforced concrete plate structure with a uniform cross-section and a width of 3.0 m, a length of 3.0 m, and a thickness of 0.3 m for the side walls 11 .

[0043] A bilaterally symmetrical trapezoidal plate tooth 2 structure is provided at the lower part of the top plate 1, and the width of the plate tooth 2 is 0.3m.

[0044] Three reserved fixed lifting bolts 4 for lifting construction are provided on the upper part of the top plate 1. The three lifting bolts 4 are arranged in an equilateral triangle with the geometric center of the top plate as the center of gravity.

[0045] The two wing side panels 3 are uniform cross-section reinforced concrete slab structures with a transverse thickness of 0.3m, a longitudinal length of 3.0m, and a vertical height of 2.7m. The upper cross-section is a regular rectangular structure, and the lower cross-section is a polygonal support structure 5 in an inverted T shape.

[0046] A horizontal straight reserved steel bar 53 extends from the inner side of the support leg 5 to strengthen the connection with the bottom cast-in-place concrete base plate 6. The length of the reserved steel bar 53 is 0.5 times the horizontal width of the cast-in-place base plate 6.

[0047] The cast-in-place concrete bottom plate 6 is a cast-in-place structure. The cast-in-place link is located after the placement of the two wing side plates and before the top plate is hoisted, or after the top plate is hoisted, the pipe is manually inserted for pouring. The assembly process is as follows Figure 5 shown.

[0048] 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. An assembled box culvert with a double-tooth cover plate, characterized in that: It comprises a top plate (1), two side plates (3) and a cast-in-place bottom plate (6); The lower surface of the top plate (1) is provided with two trapezoidal tooth plates (2) that are symmetrical on both sides, the tooth plates (2) have straight walls and inclined walls, and the upper surface of the top plate (1) is provided with hanging bolts (4); The two wing side panels (3) are installed below the top plate (1), the tops of the two wing side panels (3) are in contact with the lower surface of the top plate (1), the upper side walls of the two wing side panels (3) are in contact with the straight wall of the tooth plate (2), and the lower parts of the two wing side panels (3) are also provided with support legs (5) integrally formed with the two wing side panels (3), and the reserved steel bars (53) prefabricated and extended from the inner side of the support legs (5) extend to the inside of the cast-in-place bottom plate (6); The two wing side plates (3) are placed on the foundation, and cast-in-situ concrete is poured at the position of the cast-in-situ bottom plate (6) to form the cast-in-situ bottom plate (6).

2. The assembled box culvert with double-tooth cover plate according to claim 1, characterized in that: The top plate (1) is a reinforced concrete plate structure with a uniform cross-section.

3. The assembled box culvert with double-tooth cover plate according to claim 1, characterized in that: The tooth plate (2) comprises a left tooth plate (21) and a right tooth plate (22), and the distance between the two straight walls of the left tooth plate (21) and the right tooth plate (22) is no greater than the difference between the transverse width of the top plate (1) and twice the thickness of the two wing side plates (3).

4. The assembled box culvert with double-tooth cover plate according to claim 1, characterized in that: The extended length of the reserved steel bars (53) is 1 / 5 to 1 / 2 of the transverse width of the cast-in-place base plate (6).

5. The assembled box culvert with double-tooth cover plate according to claim 1, characterized in that: There are more than two hanging bolts (4) provided on the upper surface of the top plate (1), which are symmetrically arranged; the hanging bolts (4) are pre-placed in the steel frame of the top plate (1) before the top plate (1) is cast.

6. The assembled box culvert with double-tooth cover plate according to claim 5, characterized in that: There are four hanging bolts (4), which are respectively located directly above the tooth plate (2).

7. The assembled box culvert with double-tooth cover plate according to claim 5, characterized in that: The longitudinal sections of the two wing side plates (3) are in an inverted T-shape.

8. The assembled box culvert with double-tooth cover plate according to claim 1, characterized in that: The cast-in-situ bottom plate (6) is a cast-in-situ reinforced concrete structure; after the two wing side plates (3) are installed, the bottom plate is cast before the top plate (1) is hoisted.

9. The assembled box culvert with double-tooth cover plate according to claim 1, characterized in that: The cast-in-situ bottom plate (6) is a cast-in-situ reinforced concrete structure; first, the two wing side plates (3) are placed, then the top plate (1) is hoisted, and finally, a pipeline is manually inserted to implement the casting of the bottom plate.

10. The assembled box culvert with double-tooth cover plate according to claim 1, characterized in that: The top plate (1) and the two wing side plates (3) are connected longitudinally in multiple sections in a staggered cover manner.

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