Steel-concrete composite beam cast-in-place bridge deck slab construction supporting system

Abstract

The utility model discloses a steel-concrete composite beam cast-in-place bridge deck slab construction supporting system which comprises narrow steel box girders, wood secondary ridges and wood formworks and is characterized by further comprising lug plates welded on the inner sides of the tops of the narrow steel box girders and steel main ridges fixedly connected between the adjacent narrow steel box girders through the lug plates. The cantilever steel pipe, the left inclined supporting rod and the right inclined supporting rod are arranged on the bottom plate cantilever plate on the inner side of the narrow steel box girder; the upper ends of the left inclined supporting rod and the right inclined supporting rod are connected with the midspan position of the steel main ridge, and the lower ends of the left inclined supporting rod and the right inclined supporting rod are connected with the cantilever steel pipes on the adjacent narrow steel box girders respectively. The wood secondary ridges and the wood formworks are sequentially arranged on the steel main ridges from bottom to top. A novel structural design is adopted, stress is reasonable, materials are conventional, installation is convenient, the construction speed is high, the construction cost is low, and compared with a full-space supporting system, the economic performance, the safety, the progress and the quality are greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, and in particular relates to a steel-concrete composite beam cast-in-place bridge deck construction support system. Background Art

[0002] The steel-concrete composite beam is a structure that has the dual advantages of steel beams and concrete. It is cast by narrow steel box beams and concrete bridge decks. During construction, the narrow steel box beams are processed in the steel structure processing plant and hoisted on the construction site. After the hoisting is completed, the bridge deck structure is cast in situ on the narrow steel box beam. Since there are cavities between narrow steel box beams, a steel-concrete composite beam cast-in-situ bridge deck construction support system is required to support the construction of the cast-in-situ bridge deck structure.

[0003] The existing cast-in-place bridge deck construction support system usually adopts the following two methods: one is to adopt the full-span support system. Although the construction method is relatively mature, when the bridge height is high, the amount of support construction is large, the construction progress is slow, and the foundation treatment requirements are high. The second is to set up steel pipe supports on the steel keel set on the cantilever plate of the steel box girder bottom plate. Although it solves the difficulty of high foundation treatment requirements, the amount of supports has been significantly reduced compared to the full-span support system, but the overall force of the support is concentrated on the cantilever of the steel box girder bottom plate, and the requirements for the cantilever of the steel box girder bottom plate are high. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a steel-concrete composite beam cast-in-place bridge deck construction support system, which solves the problems of large amount of support construction, slow construction progress, high requirements for foundation treatment and steel box beam bottom plate cantilever in the existing cast-in-place bridge deck construction support system.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions.

[0006] A support system for the construction of a cast-in-situ bridge deck of a steel-concrete composite beam is used to support the cast-in-situ construction of a cast-in-situ bridge deck of a steel-concrete composite beam, comprising: a narrow steel box beam, a wooden secondary rib, and a wooden formwork, characterized in that it also comprises an ear plate welded to the inner side of the top of the narrow steel box beam, fixedly connected to the steel main rib between adjacent narrow steel box beams through the ear plate, a cantilevered steel pipe arranged on the bottom plate cantilever plate on the inner side of the narrow steel box beam, a left diagonal brace, and a right diagonal brace; the upper ends of the left and right diagonal braces are both connected to the mid-span position of the steel main rib, and the lower ends of the left and right diagonal braces are respectively connected to the cantilevered steel pipes on the adjacent narrow steel box beams; the wooden secondary rib and the wooden formwork are sequentially arranged on the steel main rib from bottom to top.

[0007] Preferably, the steel main rib is provided with a bolt hole at each end for detachably connecting with the ear plates on both sides through a bolt kit; the steel main rib is provided with a bolt hole at the mid-span position for detachably connecting with the upper ends of the left diagonal brace and the right diagonal brace through a bolt kit.

[0008] Preferably, the left diagonal brace and the right diagonal brace both include a main steel pipe, an adjustable top support provided at one end of the main steel pipe for abutting against the cantilevered steel pipe, and a short channel steel provided at the other end of the main steel pipe for connecting with the mid-span position of the steel main rib.

[0009] Preferably, the short channel steel is connected to the main steel pipe by double-sided welding, and bolt holes are provided on the short channel steel. The bolt holes on the short channel steel are concentric with the bolt holes at the mid-span position of the steel main rib and are connected and fixed by a bolt kit.

[0010] Preferably, the bolt kit comprises a bolt rod, a nut and a washer.

[0011] Preferably, the ear plates are provided with oblong holes, and the ear plates are continuously and equidistantly arranged at the ends of the narrow steel box girders along the direction of the bridge, and are vertically welded at the same height of the narrow steel box girders.

[0012] Preferably, the secondary timber ribs include a lower layer of secondary timber ribs arranged longitudinally and at equal intervals in the transverse direction, and an upper layer of secondary timber ribs arranged transversely and at equal intervals in the longitudinal direction; wedge-shaped adjustment blocks are provided at both ends of the upper layer of secondary timber ribs to form chamfers matching the lower surface of the bridge deck.

[0013] Preferably, reinforcing steel plates are provided at the connection between the steel main rib and the ear plate, and at the connection between the steel main rib and the left diagonal brace and the right diagonal brace for reinforced connection.

[0014] Compared with the prior art, the utility model has the following beneficial effects: the utility model adopts a new structural design for the cast-in-place bridge deck construction support system of the steel-concrete composite beam, does not require foundation treatment, uses simple materials, uses less brackets, has a fast construction progress, has reasonable force, and has good construction safety;

[0015] 1. The steel main rib is the main component of the support system. The diagonal brace can support the part with large deflection in the span of the steel main rib, and together provide stable support for the upper structure to ensure the stability of the entire structure;

[0016] 2. The steel main ribs, diagonal braces and steel box beams form a triangle and support each other to prevent the support system from being deformed too much;

[0017] 3. The components used in the utility model can be processed and formed in batches in a steel bar processing plant. When installed on the construction site, they only need to be connected with bolts, which has high construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the front view structure of the support system of the utility model;

[0019] Figure 2It is a schematic diagram of the structure of the left diagonal brace and the right diagonal brace in the utility model;

[0020] Figure 3 It is a schematic diagram of the connection node between the left diagonal brace and the right diagonal brace and the main steel rib of the utility model;

[0021] The meanings of the symbols in the above figure are as follows: 1-left diagonal brace; 101-adjustable top support; 102-main steel pipe; 103-short channel steel; 2-steel main rib; 201-reinforced steel plate; 301-lower wooden secondary rib; 302-upper wooden secondary rib; 4-wooden formwork; 5-ear plate; 6-steel pipe; 7-narrow steel box girder; 701-bottom plate cantilever plate; 8-bolt kit; 801-bolt hole; 802 bolt rod; 803-nut; 804-gasket; 9-cast-in-place bridge deck; 10-right diagonal brace. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Example

[0024] A steel-concrete composite beam cast-in-place bridge deck construction support system, please refer to Figures 1 to 3 , used to support the cast-in-situ construction of cast-in-situ bridge decks of steel-concrete composite beams, including: a narrow steel box girder 7, a wooden secondary rib 3, a wooden formwork 4, an ear plate 5 welded to the inner side of the top of the narrow steel box girder 7, a steel main rib 2 fixedly connected to the adjacent narrow steel box girders 7 through the ear plate 5, a cantilevered steel pipe 6 arranged on the bottom plate cantilever plate 701 on the inner side of the narrow steel box girder 7, a left diagonal brace 1, and a right diagonal brace 10; the upper ends of the left diagonal brace 1 and the right diagonal brace 10 are both connected to the mid-span position of the steel main rib 2, and the lower ends of the left diagonal brace 1 and the right diagonal brace 10 are respectively connected to the cantilevered steel pipe 6 on the adjacent narrow steel box girder 7; the wooden secondary rib 3 and the wooden formwork 4 are arranged on the steel main rib 2 from bottom to top in sequence;

[0025] In this embodiment, the steel main rib 2 adopts a 10# channel steel structure, the narrow steel box girder 7 is prefabricated in the factory, the ear plate 5 adopts a q345 steel plate with a wall thickness of 16 mm, an oblong hole with a diameter of 25 mm is opened on the ear plate 5, and the wooden secondary rib 3 adopts a 9 cm×9 cm square wood; when the utility model is implemented, after the lower support system including the cantilevered steel pipe 6, the ear plate 5, the left diagonal brace 1, the right diagonal brace 10, the steel main rib 2 and the wooden secondary rib 3 is erected, a 15 mm wooden formwork 4 can be laid on the wooden secondary rib 3, and then the steel bar binding and cast-in-place bridge deck 9 construction can be carried out; among them, the steel main rib 2 is the main component of the support system, and the left diagonal brace 1 and the right diagonal brace 10 can support the part with larger deflection deformation in the middle of the span of the steel main rib 2, and jointly provide stable support to the upper structure to ensure the stability of the overall structure.

[0026] In order to facilitate the installation and disassembly of the support system of the utility model while ensuring its stability and strength, further, in a preferred embodiment, a bolt hole 801 is provided at each end of the steel main rib 2, which is used for detachable connection with the ear plates 5 on both sides through a bolt kit 8; a bolt hole 801 is provided at the mid-span position of the steel main rib 2, which is used for detachable connection with the upper ends of the left diagonal brace 1 and the right diagonal brace 10 through a bolt kit 8.

[0027] Further, in a preferred embodiment, see Figure 1 and Figure 2 The left diagonal brace 1 and the right diagonal brace 10 both include a main steel pipe 102, an adjustable top support 101 arranged at one end of the main steel pipe 102 for abutting against the cantilever steel pipe 6, and a short channel steel 103 arranged at the other end of the main steel pipe 102 for connecting with the mid-span position of the steel main rib 2; based on the above structural setting, the adjustable top support 101 is used to abut against the cantilever steel pipe 6, which can facilitate the rapid connection and disassembly of the lower ends of the left and right diagonal brace 1 and 10 with the cantilever steel pipe 6, which is beneficial to improving construction efficiency, and at the same time, the support lengths of the left and right diagonal brace 1 and 10 can be adjusted to improve their applicability to different construction conditions and environments.

[0028] Furthermore, in a preferred embodiment, the short channel steel 103 is welded to the main steel pipe 102 on both sides, and a bolt hole 801 is provided on the short channel steel 103. The bolt hole 801 on the short channel steel 103 is concentric with the bolt hole 801 at the mid-span position of the steel main rib 2 and is connected and fixed using a bolt kit 8.

[0029] Further, in a preferred embodiment, see Figure 2 The bolt kit 8 includes a bolt rod 802, a nut 803 and a washer 804.

[0030] Furthermore, in a preferred embodiment, the ear plates 5 are equidistantly and continuously arranged at the end of the narrow steel box girder 7 along the longitudinal direction of the bridge, and are vertically welded at the same height of the narrow steel box girder 7; in the specific construction, preferably, the first ear plate 5 at the end cross beam is 10 cm away from the end cross beam, and the remaining ear plates 5 are continuously arranged at equal intervals of 1.2 m along the longitudinal direction of the bridge, the weld height is 8 mm, and the center of the ear plate is 145 mm away from the top of the steel box girder.

[0031] Further, in a preferred embodiment, see Figure 1 The secondary timber ribs 3 include lower secondary timber ribs 301 arranged longitudinally and at equal intervals in the transverse direction, and upper secondary timber ribs 302 arranged transversely and at equal intervals in the longitudinal direction; wedge-shaped adjustment blocks are arranged at both ends of the upper secondary timber ribs 302 to form chamfers that match the lower surface of the bridge deck 9.

[0032] In order to ensure that a more stable support system is formed between the steel main ribs, diagonal braces and steel box beams, further, in a preferred embodiment, please refer to Figure 3 A reinforcing steel plate 201 is provided at the connection between the steel main rib 2 and the ear plate 5, and at the connection between the steel main rib 2 and the left diagonal brace 1 and the right diagonal brace 10 for reinforced connection.

[0033] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A steel-concrete composite beam cast-in-place bridge deck construction support system, used to support the cast-in-place construction of a steel-concrete composite beam cast-in-place bridge deck, comprising: A narrow steel box girder (7), a secondary wooden rib (3), and a wooden formwork (4), characterized in that it also includes an ear plate (5) welded to the inner side of the top of the narrow steel box girder (7), fixedly connected to the steel main rib (2) between adjacent narrow steel box girders (7) through the ear plate (5), a cantilevered steel pipe (6) arranged on the bottom plate cantilever plate (701) on the inner side of the narrow steel box girder (7), a left diagonal brace (1), and a right diagonal brace (10); the upper ends of the left diagonal brace (1) and the right diagonal brace (10) are both connected to the mid-span position of the steel main rib (2), and the lower ends of the left diagonal brace (1) and the right diagonal brace (10) are respectively connected to the cantilevered steel pipe (6) on the adjacent narrow steel box girder (7); the secondary wooden rib (3) and the wooden formwork (4) are arranged on the steel main rib (2) in sequence from bottom to top.

2. A steel-concrete composite beam cast-in-place bridge deck construction support system according to claim 1, characterized in that: The steel main rib (2) is provided with a bolt hole (801) at each end for detachably connecting to the ear plates (5) on both sides via a bolt kit (8); the steel main rib (2) is provided with a bolt hole (801) at the mid-span position for detachably connecting to the upper ends of the left diagonal brace (1) and the right diagonal brace (10) via a bolt kit (8).

3. A steel-concrete composite beam cast-in-place bridge deck construction support system according to claim 2, characterized in that: The left diagonal brace (1) and the right diagonal brace (10) both comprise a main steel pipe (102), an adjustable top support (101) arranged at one end of the main steel pipe (102) for abutting against the cantilever steel pipe (6), and a short channel steel (103) arranged at the other end of the main steel pipe (102) for connecting to the mid-span position of the steel main rib (2).

4. A steel-concrete composite beam cast-in-place bridge deck construction support system according to claim 3, characterized in that: The short channel steel (103) is connected to the main steel pipe (102) by double-sided welding. The short channel steel (103) is provided with a bolt hole (801). The bolt hole (801) on the short channel steel (103) is concentric with the bolt hole (801) at the mid-span position of the steel main rib (2) and is connected and fixed by a bolt kit (8).

5. The support system for cast-in-situ steel-concrete composite beam bridge deck construction according to claim 4 is characterized by: The bolt kit (8) comprises a bolt rod (802), a nut (803) and a washer (804).

6. The support system for cast-in-situ steel-concrete composite beam bridge deck construction according to claim 1, characterized in that: The ear plates (5) are continuously arranged at equal intervals along the bridge direction at the end of the narrow steel box girder (7) and are vertically welded at the same height of the narrow steel box girder (7).

7. The support system for cast-in-situ steel-concrete composite beam bridge deck construction according to claim 1, characterized in that: The timber ribs (3) comprise lower timber ribs (301) arranged longitudinally and at equal intervals in the transverse direction, and upper timber ribs (302) arranged transversely and at equal intervals in the longitudinal direction; wedge-shaped adjustment blocks are provided at both ends of the upper timber ribs (302) to form chamfers that match the lower surface of the bridge deck (9).

8. The support system for cast-in-situ steel-concrete composite beam bridge deck construction according to claim 1, characterized in that: Reinforced steel plates (201) are provided at the connection between the steel main rib (2) and the ear plate (5), and at the connection between the steel main rib (2) and the left diagonal brace (1) and the right diagonal brace (10) for reinforced connection.

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