Fabricated UHPC-NC composite beam

Abstract

The utility model discloses an assembly type UHPC-NC composite beam, which belongs to the technical field of bridge engineering, and comprises two UHPC main beams arranged in parallel at intervals along the longitudinal direction of the composite beam, an NC diaphragm plate positioned between the two UHPC main beams, and an NC bridge deck plate positioned on the upper sides of the UHPC main beams and the NC diaphragm plate, the upper sides of the UHPC main beams are connected with the NC bridge deck plate through a plurality of first double-end studs, and the upper sides of the first double-end studs are connected with the NC bridge deck plate through a plurality of second double-end studs. The inner side of the UHPC main beam is connected with the NC transverse partition plate through a plurality of second double-end studs, and the upper side of the NC transverse partition plate is connected with the NC bridge deck through third double-end studs. According to the composite beam, the UHPC material is applied, the size of the structure can be optimized, the self weight of the composite beam can be reduced, the span of a bridge can be increased, rapid prefabrication and assembly construction can be achieved, and economic cost can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge engineering, and specifically relates to an assembled UHPC-NC composite beam. Background Art

[0002] At present, with the continuous development of the bridge industry, the stress mode of composite beams has been clarified, and the problems of traditional concrete composite beams and steel-concrete in bridge applications have become increasingly obvious. In order to better play the stress characteristics of composite beam structures where the bridge deck is compressed and the main beam is tensile, the following problems need to be solved:

[0003] For traditional composite beams, the bridge has a large self-weight, which not only increases the construction and quality requirements of the lower structure of the overall structure and reduces the span of the bridge, but is also not conducive to prefabricated construction. A large amount of on-site construction work such as on-site casting, plate welding, etc. is often used, which greatly increases time and economic costs.

[0004] For steel-concrete composite beams, due to the huge difference in the elastic modulus of the two materials, it is very easy to cause compressive cracking of the concrete bridge deck, uncoordinated deformation of the two materials, failure of the connection, etc. In addition, during the service process, the steel itself is prone to buckling failure due to the heavy weight of concrete. As the service time increases, climate change will also cause corrosion and aging of the steel, and its durability is worse than that of concrete. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide an assembled UHPC-NC composite beam. By applying UHPC materials, the size of the structure itself can be optimized, the deadweight of the composite beam can be reduced, the span of the bridge can be increased, and rapid prefabrication and assembly construction can be achieved to reduce economic costs.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] The utility model discloses an assembled UHPC-NC composite beam, comprising two UHPC main beams arranged in parallel and spaced apart in the longitudinal direction of the composite beam, an NC diaphragm located between the two UHPC main beams, and an NC bridge deck located on the upper sides of the UHPC main beams and the NC diaphragm, wherein the upper side of the UHPC main beam is connected to the NC bridge deck through a plurality of first double-headed bolts, the inner side of the UHPC main beam is connected to the NC diaphragm through a plurality of second double-headed bolts, and the upper side of the NC diaphragm is connected to the NC bridge deck through a third double-headed bolt.

[0008] Furthermore, a plurality of first double-headed bolts are pre-buried at equal intervals along the longitudinal direction above the UHPC main beam, a first hole corresponding to the first double-headed bolt is opened on the NC bridge deck, a space for adjusting the first hole is reserved in the first hole, and the first double-headed bolt is cast in connection with the first hole.

[0009] Furthermore, a plurality of second double-headed bolts are pre-embedded at equal intervals along the longitudinal direction on the inner side of the UHPC main beam, a second hole corresponding to the second double-headed bolt is opened on the outer side of the NC diaphragm, a space for adjusting the second hole is reserved in the second hole, and the second double-headed bolt is cast in connection with the second hole.

[0010] Furthermore, a plurality of third double-headed bolts are pre-embedded on the upper side of the NC diaphragm at equal intervals in the longitudinal direction, and a third hole corresponding to the third double-headed bolt is opened on the NC bridge deck. A space for adjusting the third hole is reserved in the third hole, and the third double-headed bolt and the third hole are cast in connection.

[0011] Furthermore, the UHPC main beam includes a web plate and a lower flange plate integrally arranged at the lower end of the web plate, a plurality of longitudinal reinforcement bars are arranged on the inner side of the web plate along the longitudinal direction, the reinforcement bars are connected by stirrups, and a plurality of longitudinal tensile reinforcement bars are arranged on the inner side of the lower flange plate along the longitudinal direction; the NC diaphragm is connected between the web plates of the two UHPC main beams, and the lower flange plate is used to support the NC diaphragm.

[0012] Furthermore, the studs in the UHPC main beam and the studs in the NC diaphragm are arranged at equal intervals, the second double-headed studs are welded to the lateral reinforcement of the built-in stirrups of the web, the third double-headed studs are welded to the built-in longitudinal reinforcement of the NC diaphragm, and the first double-headed studs are welded to the transverse reinforcement of the built-in stirrups of the web.

[0013] Furthermore, the first double-headed bolt, the second double-headed bolt and the third double-headed bolt have the same structure. The first double-headed bolt includes a bolt rod and bolt caps fixed at both ends of the bolt rod. The performance level of the bolt is not lower than ML15.

[0014] The beneficial effects of the utility model are:

[0015] (1) The utility model discloses an assembled UHPC-NC composite beam, which assembles and splices the UHPC main beam, NC diaphragm, and NC bridge deck together through double-headed bolts, making full use of the prefabrication of UHPC, accelerating the assembly construction speed, reducing the self-weight of the composite beam, and effectively controlling the overall deformation and cracking degree, avoiding the weak stress area caused by the weakening of the lateral connection due to the wet joint, so that the overall performance of the UHPC-NC composite beam is better.

[0016] (2) The double-headed bolt of the utility model adopts the ML15 model round-headed bolt cap, which is embedded in the concrete to form a fixed constraint. The double-headed bolt can effectively resist the problem of weak stress in the post-casting section, effectively connect various components, make the overall composite beam force transmission more reasonable, and indirectly improve the durability of the UHPC-NC composite beam. The double-headed bolt cap further increases the shear strength of the composite beam connector, so that the composite beam exhibits excellent resistance when subjected to static or fatigue.

[0017] (3) The utility model discloses an assembled UHPC-NC composite beam, which can effectively reduce the workload and construction difficulty of on-site casting, plate binding and welding, and realize effective working modes such as factory prefabrication, on-site assembly, and partial on-site construction, thereby simplifying the construction process, improving construction efficiency and progress, and greatly reducing construction time and economic costs.

[0018] Other advantages, objectives and features of the utility model will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solution and beneficial effects of the utility model clearer, the utility model is described with the following drawings:

[0020] Figure 1 It is a structural schematic diagram of the composite beam of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the UHPC main beam of the utility model;

[0022] Figure 3 is a schematic diagram of the structure of a first double-headed bolt;

[0023] Figure 4 It is a schematic diagram of the structure of the longitudinal reinforcement;

[0024] Figure 5 Schematic diagram of the arrangement of the second hole.

[0025] The markings in the attached drawing are as follows: UHPC main beam 1, NC diaphragm 2, NC bridge deck 3, first double-headed bolt 4, second double-headed bolt 5, third double-headed bolt 6, first hole 7, second hole 8, third hole 9, web 10, lower flange plate 11, frame reinforcement 12, stirrups 13, longitudinal tensile reinforcement 14, bolt rod 15, bolt cap 16, longitudinal reinforcement 17. DETAILED DESCRIPTION

[0026] like Figures 1 to 5As shown, the utility model is an assembled UHPC-NC composite beam, comprising two UHPC main beams 1 arranged in parallel and spaced apart along the longitudinal direction of the composite beam, an NC diaphragm 2 located between the two UHPC main beams 1, and an NC bridge deck 3 located on the upper side of the UHPC main beams 1 and the NC diaphragm 2. The two UHPC main beams 1 have exactly the same structure, and the width of the spacing corresponds to the width of the NC diaphragm 2. The NC bridge deck 3 is installed on the upper side of the UHPC main beams 1 and the NC diaphragm 2, and the lower surface contacts the UHPC main beams 1 and the NC diaphragm 2 respectively. The total length of the UHPC main beam 1, the NC diaphragm 2 and the NC bridge deck 3 is the same, which is convenient for installation. The NC bridge deck 3 adopts a conventional equal-thickness plate to ensure uniform pressure transmission.

[0027] The upper side of the UHPC main beam 1 is connected to the NC bridge deck 3 through a plurality of first stud bolts 4, and the first stud bolts 4 are evenly spaced along the longitudinal direction. The inner side of the UHPC main beam 1 is connected to the NC diaphragm 2 through a plurality of second stud bolts 5, and the upper side of the NC diaphragm 2 is connected to the NC bridge deck 3 through a third stud bolt 6.

[0028] In this embodiment, a plurality of first double-headed bolts 4 are pre-buried at equal intervals along the longitudinal direction on the upper side of the UHPC main beam 1, a first hole 7 corresponding to the first double-headed bolt 4 is opened on the NC bridge deck 3, a space for adjusting the first hole 7 is reserved in the first hole 7, and the first double-headed bolt 4 is cast-connected with the first hole 7. Similarly, a plurality of second double-headed bolts 5 are pre-buried at equal intervals along the longitudinal direction on the inner side of the UHPC main beam 1, a second hole 8 corresponding to the second double-headed bolt 5 is opened on the outer side of the NC diaphragm 2, a space for adjusting the second hole 8 is reserved in the second hole 8, and the second double-headed bolt 5 is cast-connected with the second hole 8, and they are connected together by cast-in-place NC in a mold.

[0029] In this embodiment, a number of third double-headed bolts 6 are pre-buried at equal intervals along the longitudinal direction on the upper side of the NC diaphragm 2, and a third hole 9 corresponding to the third double-headed bolt 6 is opened on the NC bridge deck 3. A space for adjusting the third hole 9 is reserved in the third hole 9. Each reserved hole is square in shape and 60mm×60mm in size, which can accommodate the corresponding double-headed bolts and leave space for construction, installation and position adjustment, greatly increasing the construction efficiency of on-site assembly. The third double-headed bolt 6 is cast and connected to the third hole 9 to complete the overall connection of the composite beam. During the entire assembly process, the positioning of the reserved holes can realize the rapid installation of various components, reduce the construction casting time, and rationalize the construction process.

[0030] In this embodiment, the UHPC main beam 1 includes a web 10 and a lower flange plate 11 integrally arranged at the lower end of the web 10, the two are combined to form an inverted T shape, a plurality of frame bars 12 are longitudinally arranged on the inner side of the web 10, the frame bars 12 are connected by stirrups 13, a plurality of longitudinal tensile steel bars 14 are longitudinally arranged on the inner side of the lower flange plate 11, the three form a stress-bearing steel bar skeleton and are used for welding embedded bolts; the NC diaphragm 2 is connected between the webs 10 of the two UHPC main beams 1, and the lower flange plate 11 is used to support the NC diaphragm 2.

[0031] In this embodiment, the studs in the UHPC main beam 1 and the studs in the NC diaphragm 2 are arranged at equal intervals, the second double-headed stud 5 is welded to the lateral reinforcement of the stirrup 13 built into the web 10, the third double-headed stud 6 is welded to the longitudinal reinforcement 17 built into the NC diaphragm 2, and the first double-headed stud 4 is welded to the transverse reinforcement of the stirrup 13 built into the web 10. Under the premise of a certain error, it can be ensured that the studs prefabricated and installed in the actual factory can be easily passed through the reserved holes to complete the assembly and installation connection.

[0032] In this embodiment, the first double-headed bolt 4, the second double-headed bolt 5 and the third double-headed bolt 6 have the same structure. The first double-headed bolt 4 includes a bolt rod 15 and bolt caps 16 fixed at both ends of the bolt rod 15. The performance level of the bolt is not lower than ML15.

[0033] The assembly process of the composite beam is as follows: S1, prefabricate the UHPC main beam 1 in the prefabrication yard, and respectively embed the first double-headed bolt 4 and the second double-headed bolt 5 above and inside the web 10 of the UHPC main beam 1, then prefabricate the NC diaphragm 2, embed the third double-headed bolt 6 above it, and finally prefabricate the NC bridge deck 3 with the third hole 9 and the first hole 7 penetrating therethrough, and transport the UHPC main beam 1, the NC diaphragm 2 and the NC bridge deck 3 to the bridge site for assembly construction;

[0034] S2. First install the UHPC main beam 1 on the abutment or pier, and then hoist the NC diaphragm 2, ensure that the web 10 and the lower flange plate 11 of the UHPC main beam 1 are tightly attached to the NC diaphragm 2 on all sides, and align the reserved second hole 8 on the NC diaphragm 2 with the second double-headed bolt 5 embedded in the web 10 up and down, and finally hoist the NC bridge deck 3, so that the reserved first hole 7 and the third hole 9 of the NC bridge deck 3 are accurately aligned and installed with the first double-headed bolt 4 embedded above the web 10 and the third double-headed bolt 6 embedded above the NC diaphragm 2, respectively, and finally complete the assembly and erection of the composite beam by partial cast-in-place.

[0035] The utility model discloses an assembled UHPC-NC composite beam, which realizes rapid assembly of various components by pre-embedded bolts, effectively reduces the workload and construction difficulty of on-site pouring, plate binding and welding, realizes effective working modes such as factory prefabrication, on-site assembly, and partial on-site construction, simplifies the construction process, improves construction efficiency and progress, and greatly reduces construction time and economic costs.

[0036] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. An assembled UHPC-NC composite beam, characterized by: The composite beam comprises two UHPC main beams arranged in parallel and spaced apart in the longitudinal direction of the composite beam, an NC diaphragm located between the two UHPC main beams, and an NC bridge deck located on the upper sides of the UHPC main beams and the NC diaphragm. The upper side of the UHPC main beam is connected to the NC bridge deck through a plurality of first double-headed bolts, the inner side of the UHPC main beam is connected to the NC diaphragm through a plurality of second double-headed bolts, and the upper side of the NC diaphragm is connected to the NC bridge deck through a third double-headed bolt.

2. The assembled UHPC-NC composite beam according to claim 1, characterized in that: A plurality of first double-headed bolts are pre-buried at equal intervals in the longitudinal direction above the UHPC main beam, a first hole corresponding to the first double-headed bolt is opened on the NC bridge deck, a space for adjusting the first hole is reserved in the first hole, and the first double-headed bolt is cast in connection with the first hole.

3. The assembled UHPC-NC composite beam according to claim 2, characterized in that: A plurality of second double-headed bolts are pre-embedded at equal intervals along the longitudinal direction on the inner side of the UHPC main beam, a second hole corresponding to the second double-headed bolt is opened on the outer side of the NC diaphragm, a space for adjusting the second hole is reserved in the second hole, and the second double-headed bolt is cast in connection with the second hole.

4. The assembled UHPC-NC composite beam according to claim 3, characterized in that: A plurality of third double-headed bolts are pre-buried on the upper side of the NC diaphragm at equal intervals in the longitudinal direction, and a third hole corresponding to the third double-headed bolt is opened on the NC bridge deck. A space for adjusting the third hole is reserved in the third hole, and the third double-headed bolt is cast in connection with the third hole.

5. The assembled UHPC-NC composite beam according to claim 4, characterized in that: The UHPC main beam includes a web plate and a lower flange plate integrally arranged at the lower end of the web plate, a plurality of longitudinal reinforcement bars are arranged on the inner side of the web plate, the reinforcement bars are connected by stirrups, and a plurality of longitudinal tensile reinforcement bars are arranged on the inner side of the lower flange plate along the longitudinal direction; the NC diaphragm is connected between the web plates of the two UHPC main beams, and the lower flange plate is used to support the NC diaphragm.

6. The assembled UHPC-NC composite beam according to claim 5, characterized in that: The studs in the UHPC main beam and the studs in the NC diaphragm are arranged at equal intervals, the second double-headed studs are welded to the lateral reinforcement of the built-in stirrups of the web, the third double-headed studs are welded to the built-in longitudinal reinforcement of the NC diaphragm, and the first double-headed studs are welded to the transverse reinforcement of the built-in stirrups of the web.

7. The assembled UHPC-NC composite beam according to claim 4, characterized in that: The first double-headed bolt, the second double-headed bolt and the third double-headed bolt have the same structure. The first double-headed bolt includes a bolt rod and bolt caps fixed at both ends of the bolt rod. The performance level of the bolt is not lower than ML15.

Images