Supporting device of steel-concrete composite beam cantilever

Abstract

The utility model discloses a supporting device for a steel-concrete composite beam cantilever, which comprises a bottom template and a steel girder arranged on a cover beam, a steel cantilever beam is fixed on the steel girder, a first stiffening rib is fixed between the steel girder and the steel cantilever beam, shear nails are arranged on the upper end faces of the steel girder and the steel cantilever beam, and the lower end face of the steel girder and the upper end face of the steel cantilever beam are respectively provided with a second stiffening rib. Clamping grooves are formed in the steel cantilever beams, the two ends of the bottom formwork are clamped into the clamping grooves respectively, a truss is arranged at the bottom of the outer side of the bottom formwork, and the truss is detachably arranged on the steel cantilever beams. Compared with the prior art, the permanent and temporary combined design thought is adopted, the steel cantilever beam is designed to be of a permanent structure, on one hand, the steel cantilever beam serves as a cantilever supporting structure in the later operation stage, the structural rigidity and passing comfort of the cantilever position are improved, and on the other hand, the truss is matched to serve as a formwork support of the cantilever position bridge deck slab. Therefore, a support does not need to be erected from the ground position. On the basis, the cast-in-place bridge deck slab can adapt to curved bridge application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a cantilever supporting device of a steel-concrete composite beam. Background Art

[0002] At present, steel-concrete composite bridges are widely used in urban road cross-bridge projects. Such projects often put forward higher requirements for traffic maintenance and construction period during construction. The cantilever structure of the traditional steel-concrete composite beam bridge often does not have a steel cantilever beam structure, and often relies only on the bridge deck structure as the cantilever force-bearing structure, and does not consider the construction implementation plan of the bridge deck too much. There are two main schemes for concrete bridge deck structures, namely cast-in-place scheme and prefabricated scheme. If the bridge deck adopts the cast-in-place scheme, it is necessary to set up a bracket to support the formwork, and the position under the bridge will often be inaccessible, which seriously affects the traffic maintenance of the road under the bridge. If the prefabricated scheme is adopted, the bridge deck needs to be divided into smaller sizes, the installation and wet joint casting process is more cumbersome, and the construction period is also longer, which is also not conducive to the traffic under the bridge. Utility Model Content

[0003] The utility model provides a cantilever support device for a steel-concrete composite beam, which is used to solve the problems that the current bridge deck construction affects the passage under the bridge or the installation and wet joint casting process is complicated and the construction period is long.

[0004] The utility model provides a supporting device for a cantilever of a steel-concrete composite beam, comprising a bottom template and a steel main beam arranged on a cap beam, a steel cantilever beam being fixed on the steel main beam, a first stiffening rib being fixed between the steel main beam and the steel cantilever beam, shear nails being arranged on the upper end faces of the steel main beam and the steel cantilever beam, a clamping groove being arranged on the steel cantilever beam, two ends of the bottom template being respectively clamped into the clamping grooves, a truss being arranged at the bottom of the outer side of the bottom template, and the truss being detachably arranged on the steel cantilever beam.

[0005] Preferably, the steel cantilever beam comprises: a cantilever top plate, a cantilever web plate, a supporting top plate, a supporting pallet and a cantilever bottom plate, the cantilever top plate is fixed to the cantilever bottom plate through the cantilever web plate, the supporting top plate and the supporting pallet are fixed in sequence below the cantilever top plate, and the slot is arranged between the cantilever top plate and the supporting top plate.

[0006] Preferably, the truss includes a stopper and a bracket, the support plate is detachably connected to the stopper, both ends of the bracket are placed on the support plate and inserted between the stopper and the steel cantilever beam, and the upper end of the bracket supports the bottom template.

[0007] Preferably, the truss further comprises a pad block, and the pad block is arranged between the bracket and the bottom template.

[0008] Preferably, one of the stoppers is detachably connected to the cantilever bottom plate, and both ends of the bracket are placed on the cantilever bottom plate and inserted between the stopper and the steel cantilever beam.

[0009] Preferably, the bracket includes: an upper chord, a lower chord, an oblique rod and a reinforcing rod, part of the oblique rod is fixed between the upper chord and the lower chord, part of the oblique rod is fixed between the upper chord and the reinforcing rod, two reinforcing rods are arranged at both ends of the upper chord, the two ends of the upper chord are placed on a supporting plate, and the reinforcing rod is placed on the cantilever bottom plate.

[0010] Preferably, the steel cantilever beam further comprises a second stiffening rib, wherein the second stiffening rib is fixed on the cantilever web, and two ends of the second stiffening rib are respectively fixed on the supporting top plate and the cantilever bottom plate.

[0011] Preferably, the support plate is fixedly connected to the second stiffening rib.

[0012] Preferably, the cantilever bottom plate comprises an inclined surface section and a plane section, the plane section is located below the supporting plate, and a higher end of the inclined surface section is connected to the plane section.

[0013] Preferably, the steel main beam comprises: a steel longitudinal beam top plate, a steel longitudinal beam bottom plate and a steel longitudinal beam web, the steel longitudinal beam web is fixed between the steel longitudinal beam top plate and the steel longitudinal beam bottom plate, and the first stiffening rib is fixed on the steel longitudinal beam web.

[0014] Compared with the prior art, the utility model adopts a design concept of combining permanent and temporary, and designs the steel cantilever beam as a permanent structure. On the one hand, it serves as a cantilever support structure in the later operation stage to improve the structural rigidity and traffic comfort of the cantilever position. On the other hand, it cooperates with the truss as the formwork support of the bridge deck at the cantilever position, so there is no need to set up a bracket from the ground position, or adopt other cantilever formwork support structures that are more complex, costly, or may have an adverse effect on the main steel structure. On this basis, the cast-in-place bridge deck can adapt to the application scenario of the curved bridge. Secondly, it is easy to install, simple to disassemble, and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of removing the bottom template of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the steel main beam and the steel cantilever beam of the utility model;

[0019] Figure 4 It is the front view of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the steel main beam of the utility model;

[0021] Figure 6 It is a structural schematic diagram of a steel cantilever beam of the utility model;

[0022] Figure 7 It is a structural schematic diagram of the bracket of the utility model;

[0023] Figure 8 for Figure 2 A magnified schematic diagram of the structure in the middle.

[0024] Reference numerals:

[0025] 1. Bottom formwork, 2. Steel main beam, 3. Steel cantilever beam, 4. First stiffening rib, 5. Shear nails, 6. Truss, 21. Steel longitudinal beam top plate, 22. Steel longitudinal beam bottom plate, 23. Steel longitudinal beam web, 31. Cantilever top plate, 32. Cantilever web, 33. Support top plate, 34. Support support plate, 35. Cantilever bottom plate, 36. Second stiffening rib, 351. Inclined section, 352. Plane section, 61. Block, 62. Bracket, 621. Upper chord, 622. Lower chord, 623. Diagonal rod, 624. Reinforcement rod, 100. Slot. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See attached Figure 1 and attached Figure 4The utility model provides a support device for a cantilever of a steel-concrete composite beam, comprising a bottom template 1 and a steel main beam 2 arranged on a cap beam, a steel cantilever beam 3 being fixed on the steel main beam 2, a first stiffening rib 4 being fixed between the steel main beam 2 and the steel cantilever beam 3, the structural design enables the steel cantilever beam 3 to be more firmly fixed on the steel main beam 2, the upper end surface of the steel main beam 2 and the upper end surface of the steel cantilever beam 3 are both provided with shear nails 5, a clamping groove 100 is provided on the steel cantilever beam 3, the two ends of the bottom template 1 are respectively clamped into the clamping groove 100, a truss 6 is provided at the bottom of the outer side of the bottom template 1, and the truss 6 is detachably arranged on the steel cantilever beam 3. The two ends of the bottom template 1 are supported by the steel cantilever beam 3, the outer side of the bottom template 1 is supported by the truss 6, and then the side template is installed, and then the bridge deck reinforcement can be tied. After the reinforcement of the entire bridge deck is tied, the concrete bridge deck can be cast as a whole at one time to improve the integrity and durability of the bridge deck. Among them, the bottom formwork 1, the upper end surface of the steel cantilever beam 3 and the upper end surface of the steel main beam 2 are used together as the bottom formwork of the bridge deck. The utility model adopts a cast-in-place bridge deck that can adapt to the application scenario of the curved bridge, and adopts the steel cantilever beam 3 structure as a permanent support, which greatly improves the cantilever position extension ability and can better adapt to the cantilever requirements on the outside of the curve. Secondly, the steel cantilever beam 3 and the temporary support truss 6 are used as the formwork support of the bridge deck, which is convenient to install, simple to disassemble, and low in cost.

[0028] The bottom formwork 1 is bamboo plywood, and the bottom formwork of the bridge deck adopts a three-side force mode, and no constraints are made on the side close to the steel main beam 2. Considering that steel bars have been tied when pouring concrete, the thickness of the bridge deck is relatively small, and the thickness of conventional bamboo plywood is sufficient to support the deformation within the span between the steel cantilever beams 3. Therefore, in order to avoid waste of steel structure materials and ensure the beautiful structure after construction, no inner support plate is set. In addition, not setting support on the inside can further simplify the construction and prevent slot misalignment caused by deformation of the bamboo plywood.

[0029] An implementation method of the steel cantilever beam 3: Figure 6 The steel cantilever beam 3 includes: a cantilever top plate 31, a cantilever web plate 32, a support top plate 33, a support pallet 34 and a cantilever bottom plate 35. The cantilever top plate 31 is fixed to the cantilever bottom plate 35 through the cantilever web plate 32. The support top plate 33 and the support pallet 34 are fixed in sequence below the cantilever top plate 31. The card slot 100 is set between the cantilever top plate 31 and the support top plate 33.

[0030] As another embodiment of the present invention: the steel cantilever beam 3 further includes a second stiffening rib 36, which is fixed to the cantilever web 32, and the two ends of the second stiffening rib 36 are respectively fixed to the support top plate 33 and the cantilever bottom plate 35. This structural design is conducive to improving the structural strength of the steel cantilever beam 3.

[0031] An implementation method of the truss 6: Figure 2The truss 6 includes a stopper 61 and a bracket 62. The stopper 61 is detachably connected to the support plate 34. The two ends of the bracket 62 are placed on the support plate 34 and inserted between the stopper 61 and the steel cantilever beam 3. Specifically, the end of the bracket 62 is inserted between the stopper 61 and the second stiffening rib 36. The upper end of the bracket 62 supports the bottom template 1. Specifically, the pad is arranged between the bracket 62 and the bottom template 1. The bracket 62 supports the bottom template 1 through the pad. There are multiple pads between the bottom template 1 and the bracket 62. The setting of the stopper 61 can effectively prevent the bracket 62 from deviating.

[0032] As another embodiment of the present invention: Figure 8 , one of the blocks 61 is detachably connected to the cantilever bottom plate 35, and both ends of the bracket 62 are placed on the cantilever bottom plate 35 and inserted between the block 61 and the steel cantilever beam 3. Specifically, the end of the bracket 62 is inserted between the block 61 and the second stiffening rib 36. In this structural design, the bracket 62 adds a support point on the steel cantilever beam 3, which is conducive to ensuring the support effect of the truss 6.

[0033] Specifically, the stopper 61 is a U-shaped plate, and the U-shaped plate is fixed on the supporting plate 34 or the cantilever bottom plate 35 by bolts.

[0034] One embodiment of the bracket 62: Figure 7 The bracket 62 includes: an upper chord 621, a lower chord 622, an oblique rod 623 and a reinforcing rod 624. Part of the oblique rod 623 is fixed between the upper chord 621 and the lower chord 622, and part of the oblique rod 623 is fixed between the upper chord 621 and the reinforcing rod 624. Two adjacent oblique rods 623 are distributed in a V shape. Two reinforcing rods 624 are arranged at both ends of the upper chord 621. Both ends of the upper chord 621 are placed on the support plate 34, and the reinforcing rod 624 is placed on the cantilever bottom plate 35. The upper chord 621, the lower chord 622, the oblique rod 623 and the reinforcing rod 624 are all angle steels. The bracket 62 has a simple structure, light weight, low cost, and can be reused. The bracket 62 can be mass-produced in a factory according to the spacing and size of the steel cantilever beam 3, and can also be welded and assembled on site according to needs.

[0035] As another embodiment of the present invention: the support plate 34 is fixedly connected to the second stiffening rib 36. This structural design is conducive to ensuring the supporting effect of the support plate 34.

[0036] As another embodiment of the present utility model: the cantilever bottom plate 35 includes an inclined surface section 351 and a plane section 352, the plane section 352 is located below the support plate 34, and the higher end of the inclined surface section 351 is connected to the plane section 352. The upper end surface of the first stiffening rib 4 is an inclined surface, and the upper end surface of the first stiffening rib 4 matches the bottom of the inclined surface section 351. This structural design makes the thickness of the outer side of the steel cantilever beam 3 small and the thickness of the inner side large, thereby reducing the amount of steel used while ensuring the structural strength of the steel cantilever beam 3. Secondly, the inclined surface design is conducive to expanding the contact area between the first stiffening rib 4 and the cantilever bottom plate 35.

[0037] An implementation method of the steel main beam 2: refer to the attached Figure 5 The steel main beam 2 includes: a steel longitudinal beam top plate 21, a steel longitudinal beam bottom plate 22 and a steel longitudinal beam web 23. The steel longitudinal beam web 23 is fixed between the steel longitudinal beam top plate 21 and the steel longitudinal beam bottom plate 22. The first stiffening rib 4 is fixed on the steel longitudinal beam web 23. Figure 3 When the upper end of the cantilever web 32 is fixed to the bottom of the steel longitudinal beam top plate 21 , the upper end surface of the steel longitudinal beam top plate 21 is flush with the upper end surface of the cantilever top plate 31 , and the bottom of the inclined surface section 351 is fixed to the top end of the first stiffening rib 4 .

[0038] In actual projects, the steel main beam 2 and the steel cantilever beam 3 are first manufactured in a steel structure processing plant. The steel cantilever beam 3 can be welded together with the steel main beam 2 in the factory and then transported. Alternatively, the steel cantilever beam 3 can be transported in blocks to the construction site for welding and connection considering transportation conditions.

[0039] The prefabricated steel main beam 2 and steel cantilever beam 3 are hoisted onto the constructed cap beam and installed in place. After all the steel structures of the entire bridge are hoisted in place, the transverse connecting beams are assembled to complete the installation of the steel structure of the steel-concrete composite beam.

[0040] The truss 6 is installed at the end of the steel cantilever beam 3. Since the steel cantilever beam 3 is provided with a slot 100, the truss 6 can be horizontally translated and placed in place. Then the side formwork is installed, and then the bridge deck reinforcement can be tied. After the reinforcement of the entire bridge deck is tied, the concrete bridge deck can be poured as a whole at one time to improve the integrity and durability of the bridge deck.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A cantilever support device for a steel-concrete composite beam, characterized in that: It includes a bottom template and a steel main beam arranged on a cap beam, a steel cantilever beam is fixed on the steel main beam, a first stiffening rib is fixed between the steel main beam and the steel cantilever beam, shear nails are arranged on the upper end faces of the steel main beam and the steel cantilever beam, a slot is arranged on the steel cantilever beam, the two ends of the bottom template are respectively inserted into the slots, a truss is arranged at the bottom of the outer side of the bottom template, and the truss is detachably arranged on the steel cantilever beam.

2. The cantilever support device of the steel-concrete composite beam according to claim 1 is characterized in that: The steel cantilever beam comprises: a cantilever top plate, a cantilever web plate, a supporting top plate, a supporting pallet and a cantilever bottom plate. The cantilever top plate is fixed to the cantilever bottom plate through the cantilever web plate. The supporting top plate and the supporting pallet are fixed in sequence below the cantilever top plate. The slot is arranged between the cantilever top plate and the supporting top plate.

3. The cantilever support device of the steel-concrete composite beam according to claim 2 is characterized in that: The truss comprises a stopper and a bracket. The stopper is detachably connected to the support plate. Two ends of the bracket are placed on the support plate and inserted between the stopper and the steel cantilever beam. The upper end of the bracket supports the bottom template.

4. The cantilever support device of the steel-concrete composite beam according to claim 3 is characterized in that: The truss also includes a cushion block, which is arranged between the bracket and the bottom template.

5. The cantilever support device of the steel-concrete composite beam according to claim 4 is characterized in that: One of the stoppers is detachably connected to the cantilever bottom plate, and the two ends of the bracket are placed on the cantilever bottom plate and clamped between the stopper and the steel cantilever beam.

6. The cantilever support device of the steel-concrete composite beam according to claim 5, characterized in that: The bracket includes: an upper chord, a lower chord, an oblique rod and a reinforcing rod, part of the oblique rod is fixed between the upper chord and the lower chord, part of the oblique rod is fixed between the upper chord and the reinforcing rod, two reinforcing rods are arranged at both ends of the upper chord, the two ends of the upper chord are placed on a supporting plate, and the reinforcing rod is placed on the cantilever bottom plate.

7. The cantilever support device of a steel-concrete composite beam according to claim 2, characterized in that: The steel cantilever beam also includes a second stiffening rib, which is fixed on the cantilever web, and two ends of the second stiffening rib are respectively fixed on the supporting top plate and the cantilever bottom plate.

8. The cantilever support device of a steel-concrete composite beam according to claim 7, characterized in that: The support plate is fixedly connected to the second stiffening rib.

9. The cantilever support device of the steel-concrete composite beam according to claim 8, characterized in that: The cantilever bottom plate comprises an inclined surface section and a plane section, wherein the plane section is located below the supporting plate, and a higher end of the inclined surface section is connected to the plane section.

10. The cantilever support device of a steel-concrete composite beam according to claim 1, characterized in that: The steel main beam comprises: a steel longitudinal beam top plate, a steel longitudinal beam bottom plate and a steel longitudinal beam web plate, the steel longitudinal beam web plate is fixed between the steel longitudinal beam top plate and the steel longitudinal beam bottom plate, and the first stiffening rib is fixed on the steel longitudinal beam web plate.

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