An assembled UHPC sandwich composite plate culvert structure

Abstract

The application relates to an assembled UHPC sandwich composite board culvert structure, which comprises a prefabricated UHPC sandwich composite cover plate, a first prefabricated UHPC sandwich composite side plate, a second prefabricated UHPC sandwich composite side plate and a cast-in-situ bottom plate, the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate are respectively connected at the left and right ends of the cast-in-situ bottom plate, the upper end of the first prefabricated UHPC sandwich composite side plate and the upper end of the second prefabricated UHPC sandwich composite side plate are both connected with the prefabricated UHPC sandwich composite cover plate, the prefabricated UHPC sandwich composite cover plate, the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate all sequentially comprise a UHPC reinforced surface layer, a foam concrete flexible layer and a concrete inner plate from outside to inside, and the inner and outer end faces of the foam concrete flexible layer are respectively connected with the concrete inner plate and the UHPC reinforced surface layer; the technical problems of excessive peripheral soil pressure of the assembled culvert in the prior art and large lifting and installation weight, large construction difficulty and high cost are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated culvert, in particular to a prefabricated UHPC sandwich composite plate culvert structure. BACKGROUND

[0002] As a linear system engineering, the conditions along the line are complex and changeable, and highway culverts need to be used to meet the road functions of drainage and passage. The traditional culvert is mostly built by cast-in-place concrete or mortar rubble, and the quality of the finished product depends largely on the personal technical level of the construction personnel. Quality problems such as mortar leakage and voids are inevitable, which seriously affects the use function of the highway structure. In recent years, technical personnel are scarce, and stone masons and other technical workers have appeared to be out of date. Under this background, the construction mode of highway culvert should be changed from the traditional mortar rubble, cast-in-place concrete and dispersed prefabrication to a factory, intensive and professional construction mode.

[0003] Based on the above status, some prefabricated cover plate culverts have appeared in China. This culvert is designed based on cast-in-place cover plate culvert, and the bearing capacity of the cover plate and side plate of the cover plate culvert is determined by the surrounding soil pressure. Therefore, under high overburden height, the cross-sectional size of the prefabricated component is large, the structure self-weight is high, which is not conducive to on-site assembly; the material consumption is large, which leads to higher cost than cast-in-place cover plate culvert. The size of the soil pressure borne by the culvert is mainly affected by the overburden height and the burying mode, etc. Under the premise of the same culvert type and filling height, different burying modes will produce different culvert-soil interaction effects, thereby producing additional soil pressure in different directions acting on the culvert. Figure 1 As shown in the upper buried culvert, the overburden above the base is filled with soil. Since the rigid culvert is almost incompressible, and the compressibility of the soil on both sides of the culvert is large, under the action of the upper overburden load, the settlement amount of the outer soil column is greater than that of the inner soil column, so that the outer soil column will produce a downward shear force on the inner soil column, making the soil pressure around the culvert super large; as shown in Figure 2 The ditch buried culvert is opposite to the upper buried culvert. The undisturbed soil on both sides of the ditch buried culvert is undisturbed soil, and the weight compression has already been completed. The new filling soil column needs to produce a compression deformation amount, so that the outer soil column produces an upward shear force on the inner soil column, making the vertical soil pressure at the top of the culvert less than the soil column pressure, and producing a soil arching effect. SUMMARY

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a prefabricated UHPC sandwich composite plate culvert structure to solve the technical problems of excessive peripheral soil pressure of the prefabricated culvert in the prior art, large lifting and installation weight, high construction difficulty and high cost.

[0005] To solve the above technical problems, the application provides an assembled UHPC sandwich composite board culvert structure, which comprises a prefabricated UHPC sandwich composite cover plate, a first prefabricated UHPC sandwich composite side plate, a second prefabricated UHPC sandwich composite side plate and a cast-in-place bottom plate, the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate are respectively connected to the left and right ends of the cast-in-place bottom plate, the upper end of the first prefabricated UHPC sandwich composite side plate and the upper end of the second prefabricated UHPC sandwich composite side plate are both connected to the prefabricated UHPC sandwich composite cover plate, and the prefabricated UHPC sandwich composite cover plate, the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate all sequentially comprise a UHPC reinforced surface layer, a foam concrete flexible layer and a concrete inner plate from outside to inside, and the inner and outer end faces of the foam concrete flexible layer are respectively connected to the concrete inner plate and the UHPC reinforced surface layer.

[0006] After the above structure is adopted, the assembled UHPC sandwich composite board culvert structure has the following advantages: the upper-buried culvert form is adopted, the UHPC reinforced surface layer of the outer layer acts as a protective layer of the foam concrete flexible layer, effectively prevents the soil water from being absorbed by the foam concrete flexible layer, thereby enhancing the durability and bearing capacity of the structure, the foam concrete flexible layer of the prefabricated UHPC sandwich composite cover plate can increase the settlement amount of the soil column inside the culvert top, so that the settlement amount of the soil column inside the culvert top is greater than the settlement amount of the soil column outside the culvert side, thereby converting the upper-buried culvert into a similar ditch-buried culvert stress condition, thereby reducing the vertical soil pressure on the culvert, and the foam concrete flexible layer not only changes the peripheral soil pressure distribution and fully plays the soil arch effect, but also helps to reduce the structural section size and optimize the structural design;

[0007] The application changes the distribution mode of the culvert peripheral soil pressure, the flexible sandwich layer formed by the foam concrete flexible layer greatly reduces the soil pressure around the culvert, thereby reducing the size of the prefabricated cover plate culvert component, reducing the weight and construction difficulty of lifting and installation, adopting the factory prefabrication and on-site assembly mode, which can not only effectively ensure the construction quality, but also significantly shorten the construction period, improve the engineering progress, greatly reduce the workload, and has relatively low cost, realizes the rapid connection of factory prefabricated concrete components on site, and promotes the development of bridge industrialized construction technology.

[0008] As an improvement, the bottom end of the prefabricated UHPC sandwich composite cover plate is provided with mounting grooves on both sides, and the cross-sectional shape of the prefabricated UHPC sandwich composite cover plate in the vertical plane is inverted chevron-shaped, the upper end of the first prefabricated UHPC sandwich composite side plate and the upper end of the second prefabricated UHPC sandwich composite side plate extend into the mounting grooves on both sides and are connected with the top end surface of the mounting grooves, the inner side end surface of the first prefabricated UHPC sandwich composite side plate and the inner side end surface of the second prefabricated UHPC sandwich composite side plate are connected with the side walls of the mounting grooves on both sides, respectively, and the outer side end surface of the first prefabricated UHPC sandwich composite side plate and the outer side end surface of the second prefabricated UHPC sandwich composite side plate are flush with the left and right end surfaces of the prefabricated UHPC sandwich composite cover plate; this structure has the advantages of simple structure and convenient installation.

[0009] As an improvement, the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate each include a vertical section and a horizontal section, the horizontal section is connected to the inner side wall of the lower end of the vertical section, and the horizontal sections of the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate are oppositely arranged, and the two horizontal sections are connected to the left and right ends of the cast-in-place bottom plate, respectively; this structure has the advantages of simple structure, stable connection, and convenient installation.

[0010] As an improvement, the horizontal section and the cast-in-place bottom plate are connected by a plurality of first U-shaped steel bars and a plurality of second U-shaped steel bars, the closed end of the first U-shaped steel bar is connected in the horizontal section, the open end of the first U-shaped steel bar is connected in the cast-in-place bottom plate, the closed end of the second U-shaped steel bar is connected in the cast-in-place bottom plate, the open end of the second U-shaped steel bar is connected in the horizontal section, and the first U-shaped steel bars and the second U-shaped steel bars are staggered; this structure uses semi-rigid wet joints to connect, so that the foam concrete flexible layer in the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate can deform inward, and further utilizes the soil arching effect to reduce the earth pressure around the culvert.

[0011] As an improvement, the outer side end surface of the first prefabricated UHPC sandwich composite side plate and the end surface of the second prefabricated UHPC sandwich composite side plate are each provided with an extension, and the lower end of the extension is flush with the lower end surface of the first prefabricated UHPC sandwich composite side plate and the lower end surface of the second prefabricated UHPC sandwich composite side plate; this structure increases the bottom area of the first prefabricated UHPC sandwich composite side plate and the second prefabricated UHPC sandwich composite side plate by providing the extension, which facilitates construction.

[0012] As an improvement, the present application further includes a concrete cushion layer arranged on the soil base layer, and the lower end surface of the first prefabricated UHPC sandwich composite side plate, the lower end surface of the second prefabricated UHPC sandwich composite side plate, and the bottom end of the cast-in-place bottom plate are each connected to the upper end surface of the concrete cushion layer.

[0013] As an improvement, the UHPC reinforced surface layer is 10-20 mm thick, and the foam concrete flexible layer is 50-70 mm thick; with this structure, if the UHPC reinforced surface layer is too thick, it will affect the deformation of the foam concrete flexible layer, and if it is too thin, it cannot effectively prevent soil water from being absorbed by the foam concrete flexible layer, and the thickness of the foam concrete flexible layer is 50-70 mm, which ensures the strength while ensuring that the foam concrete flexible layer can deform. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Fig. 1 is a schematic diagram of the interaction between the culvert and the soil in the prior art upper-embedded culvert.

[0015] Figure 2 Fig. 2 is a schematic diagram of the interaction between the culvert and the soil in the prior art trench-embedded culvert.

[0016] Figure 3 Fig. 3 is a schematic diagram of the interaction between the culvert and the soil after the application of the present application.

[0017] Figure 4 Fig. 4 is a schematic diagram of the overall structure in the present application.

[0018] Figure 5 Fig. 5 is a schematic diagram of the connection structure between the horizontal section and the cast-in-place bottom plate in the present application.

[0019] Fig. 1 is a schematic diagram of the interaction between the culvert and the soil in the prior art upper-embedded culvert. DETAILED DESCRIPTION

[0020] The present application is a prefabricated UHPC sandwich composite plate culvert structure, which comprises a prefabricated UHPC sandwich composite cover plate 1, a first prefabricated UHPC sandwich composite side plate 2, a second prefabricated UHPC sandwich composite side plate 3, a cast-in-place bottom plate 4, a UHPC reinforced surface layer 5, a foam concrete flexible layer 6, and a concrete inner plate 7.

[0021] As Figures 3 to 5As shown, a prefabricated UHPC sandwich composite culvert structure includes a prefabricated UHPC sandwich composite cover plate 1, a first prefabricated UHPC sandwich composite side plate 2, a second prefabricated UHPC sandwich composite side plate 3, and a cast-in-place bottom plate 4. The first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 are respectively connected to the left and right ends of the cast-in-place bottom plate 4. The upper ends of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 are both connected to the prefabricated UHPC sandwich composite cover plate 1. The prefabricated UHPC sandwich composite cover plate 1, the first prefabricated UHPC sandwich composite side plate 2, and the second prefabricated UHPC sandwich composite side plate 3 all sequentially include a UHPC reinforced surface layer 5, a foam concrete flexible layer 6, and a concrete inner plate 7 from outside to inside. The inner and outer end faces of the foam concrete flexible layer 6 are respectively connected to the concrete inner plate 7 and the UHPC reinforced surface layer 5. The thickness of the UHPC reinforced surface layer 5 is 10-20 mm, preferably 20 mm. The thickness of the foam concrete flexible layer 6 is 50-70 mm, preferably 70 mm.

[0022] As shown in Figure 4 The prefabricated UHPC sandwich composite cover plate 1 is provided with mounting grooves 8 on the left and right sides of the bottom end, and the cross-sectional shape of the prefabricated UHPC sandwich composite cover plate 1 in the vertical plane is inverted chevron-shaped. The upper ends of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 extend into the mounting grooves 8 on both sides and are connected to the top end faces of the mounting grooves 8. The inner side end faces of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 are respectively connected to the side walls of the mounting grooves 8 on the left and right sides. The outer side end faces of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 are respectively flush with the left and right end faces of the prefabricated UHPC sandwich composite cover plate 1. In addition, the front and rear end faces of the first prefabricated UHPC sandwich composite side plate 2 and the front and rear end faces of the second prefabricated UHPC sandwich composite side plate 3 are also respectively flush with the front and rear end faces of the prefabricated UHPC sandwich composite cover plate 1. Moreover, the two mounting grooves 8 are both arranged on the concrete inner plate 7 of the prefabricated UHPC sandwich composite cover plate 1.

[0023] As shown in Figure 4 The first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 both include a vertical section 14 and a horizontal section 15. The horizontal section 15 is connected to the inner side wall of the lower end of the vertical section 14, and the horizontal sections 15 of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 are oppositely arranged. The two horizontal sections 15 are respectively connected to the left and right ends of the cast-in-place bottom plate 4. Figure 5As shown, the horizontal section 15 is connected with the cast-in-place bottom plate 4 by a plurality of first U-shaped steel bars 9 and a plurality of second U-shaped steel bars 10, the closed end of the first U-shaped steel bar 9 is connected in the horizontal section 15, the open end of the first U-shaped steel bar 9 is connected in the cast-in-place bottom plate 4, the closed end of the second U-shaped steel bar 10 is connected in the cast-in-place bottom plate 4, and the open end of the second U-shaped steel bar 10 is connected in the horizontal section 15, and the first U-shaped steel bar 9 and the second U-shaped steel bar 10 are staggered. In addition, the outer end surface of the first prefabricated UHPC sandwich composite side plate 2 and the end surface of the second prefabricated UHPC sandwich composite side plate 3 are provided with an extension 11, the lower end of the extension 11 is flush with the lower end surface of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3, and in the case of not considering the extension 11, the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 are both L-shaped, and the extension 11 is arranged downward from the lower end of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3, wherein the horizontal section 15 is arranged on the concrete inner plate 7 of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3, and the extension 11 is arranged on the UHPC reinforced surface layer 5 of the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3.

[0024] As shown in the drawings, Figure 4 The application also includes a concrete cushion layer 13 arranged on the soil base layer 12, the lower end surface of the first prefabricated UHPC sandwich composite side plate 2, the lower end surface of the second prefabricated UHPC sandwich composite side plate 3 and the bottom end of the cast-in-place bottom plate 4 are connected to the upper end surface of the concrete cushion layer 13, wherein the lower end surface of the extension 11 and the horizontal section 15 is also connected to the upper end surface of the concrete cushion layer 13.

[0025] The application adopts the form of an upper-buried culvert, the outer UHPC reinforced surface layer 5 acts as a protective layer for the foam concrete flexible layer 6, effectively preventing soil water from being absorbed by the foam concrete flexible layer 6, thereby enhancing the durability and carrying capacity of the structure, and the foam concrete flexible layer 6 of the prefabricated UHPC sandwich composite cover plate 1 can increase the settlement amount of the soil column inside the culvert top, as Figure 3The flexible layer 6 of foam concrete changes the distribution of the earth pressure around the culvert, fully plays the soil arching effect, and also helps to reduce the structural section size and optimize the structural design; the distribution mode of the earth pressure around the culvert is changed, the flexible interlayer formed by the flexible layer 6 of foam concrete greatly reduces the earth pressure around the culvert, thereby reducing the size of the prefabricated cover plate culvert component, reducing the weight of lifting installation and the construction difficulty, adopting the factory prefabrication and on-site assembly mode, which can effectively ensure the construction quality, significantly shorten the construction period, improve the engineering progress, greatly reduce the workload, and has relatively low cost, realizes the rapid connection of the factory prefabricated concrete components on site, promotes the development of the industrialized construction technology of bridges, and the semi-rigid wet joint is adopted between the horizontal section 15 and the cast-in-place bottom plate 4, so that the flexible layer 6 of foam concrete in the first prefabricated UHPC sandwich composite side plate 2 and the second prefabricated UHPC sandwich composite side plate 3 can deform inward, and the soil arching effect is further utilized to reduce the earth pressure around the culvert.

[0026] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above-described one embodiment, and all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

Claims

1. A prefabricated UHPC sandwich composite slab culvert structure, characterized in that, The application relates to a prefabricated UHPC sandwich composite cover plate (1), a first prefabricated UHPC sandwich composite side plate (2), a second prefabricated UHPC sandwich composite side plate (3) and a cast-in-place bottom plate (4), the first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3) are respectively connected at the left and right ends of the cast-in-place bottom plate (4), the upper end of the first prefabricated UHPC sandwich composite side plate (2) and the upper end of the second prefabricated UHPC sandwich composite side plate (3) are both connected with the prefabricated UHPC sandwich composite cover plate (1), the prefabricated UHPC sandwich composite cover plate (1), the first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3) all sequentially comprise a UHPC reinforced surface layer (5), a foam concrete flexible layer (6) and a concrete inner plate (7) from outside to inside, and the inner and outer end faces of the foam concrete flexible layer (6) are respectively connected with the concrete inner plate (7) and the UHPC reinforced surface layer (5).

2. The prefabricated UHPC sandwich composite slab culvert structure according to claim 1, characterized in that, The bottom end of the prefabricated UHPC sandwich composite cover plate (1) is provided with mounting grooves (8) on the left and right sides, and the cross-sectional shape of the prefabricated UHPC sandwich composite cover plate (1) in the vertical plane is inverted chevron-shaped, the upper end of the first prefabricated UHPC sandwich composite side plate (2) and the upper end of the second prefabricated UHPC sandwich composite side plate (3) respectively extend into the mounting grooves (8) on the two sides and are connected with the top end faces of the mounting grooves (8), the inner side end faces of the first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3) are respectively connected with the side walls of the mounting grooves (8) on the left and right sides, and the outer side end faces of the first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3) are respectively flush with the left and right end faces of the prefabricated UHPC sandwich composite cover plate (1).

3. The prefabricated UHPC sandwich composite slab culvert structure according to claim 1, characterized in that, The first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3) both comprise a vertical section (14) and a horizontal section (15), the horizontal section (15) is connected to the inner side wall of the lower end of the vertical section (14), and the horizontal sections (15) of the first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3) are oppositely arranged, and the two horizontal sections (15) are respectively connected to the left and right ends of the cast-in-place bottom plate (4).

4. The prefabricated UHPC sandwich composite slab culvert structure according to claim 3, characterized in that, The horizontal section (15) and the cast-in-place bottom plate (4) are connected through a plurality of first U-shaped steel bars (9) and a plurality of second U-shaped steel bars (10), the closed end of the first U-shaped steel bar (9) is connected in the horizontal section (15), the open end of the first U-shaped steel bar (9) is connected in the cast-in-place bottom plate (4), the closed end of the second U-shaped steel bar (10) is connected in the cast-in-place bottom plate (4), the open end of the second U-shaped steel bar (10) is connected in the horizontal section (15), and the first U-shaped steel bars (9) and the second U-shaped steel bars (10) are staggered.

5. The prefabricated UHPC sandwich composite slab culvert structure according to claim 1, characterized in that, The first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3) are provided with an extension (11) at the outer end face, and the lower end of the extension (11) is flush with the lower end face of the first prefabricated UHPC sandwich composite side plate (2) and the second prefabricated UHPC sandwich composite side plate (3).

6. The prefabricated UHPC sandwich composite slab culvert structure according to claim 1, characterized in that, Further comprising a concrete cushion layer (13) arranged on the soil base layer (12), and the lower end face of the first prefabricated UHPC sandwich composite side plate (2), the lower end face of the second prefabricated UHPC sandwich composite side plate (3) and the bottom end of the cast-in-place bottom plate (4) are connected to the upper end face of the concrete cushion layer (13).

7. The prefabricated UHPC sandwich composite slab culvert structure according to any one of claims 1 to 6, characterized in that, The UHPC reinforced surface layer (5) has a thickness of 10-20mm, and the foam concrete flexible layer (6) has a thickness of 50-70mm.

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