Cast-in-place bridge deck formwork supporting structure for widening old bridge

Abstract

The utility model relates to the field of municipal engineering construction, and discloses an old bridge widening cast-in-place bridge deck formwork supporting structure which comprises an old bridge main beam, a prefabricated main beam is fixedly connected to one side of the outer wall of the old bridge main beam, and a cast-in-place bridge deck beam is fixedly connected to the top of the prefabricated main beam. One side of the outer wall of the cast-in-place bridge floor beam is fixedly connected to one side of the outer wall of the old bridge girder, vertical rods are fixedly connected into the bracket, transverse rods are fixedly connected into the bracket, inclined rods are fixedly connected into the bracket, a connecting plate is fixedly connected into the bracket, and a supporting assembly is arranged at the top of the bracket. The supporting assembly is used for supporting. According to the utility model, the effects that a floor type bracket is not required to be arranged when the cast-in-place bridge floor beam is constructed, the ground traffic is not influenced, the bracket, the support frame panel, the guardrail and other components are all prefabricated into blocks in a factory and then transported to the site for installation, the structure is simple and reliable, the assembly and disassembly are convenient and fast, and the site high-altitude welding work is not required are achieved.

Description

Technical Field

[0001] This utility model relates to the field of municipal engineering construction, and in particular to a formwork support structure for cast-in-place bridge deck panels for widening old bridges. Background Technology

[0002] With economic development and increasingly busy traffic, more and more old bridges are unable to meet current traffic requirements due to insufficient bridge deck width. Therefore, the renovation or reconstruction of old bridges is an important project in infrastructure construction. Demolishing and rebuilding old bridges is undoubtedly the most effective way to solve the problem. However, for most old bridges, the bridge is in good working order. Demolishing and rebuilding them simply because the width is insufficient is wasteful of resources and has a long construction period, which does not conform to the green and environmentally friendly sustainable development path. Therefore, widening old bridges is an important direction for the renovation of old bridges.

[0003] The existing bridge widening project typically uses T-beams as the formwork support structure for cast-in-place bridge decks. This structure mainly consists of beams and crossbeams. During the widening process, new T-beam structures are manufactured, prepared, and installed on both sides of the existing bridge. These T-beams are usually placed above the existing bridge span and connected to the existing structure via prefabricated connectors. The new T-beam structures are connected and supported by crossbeams to share the bridge load and ensure coordination between the new widened section and the existing bridge structure. After installation, the entire bridge needs to be paved to ensure that the newly widened bridge can meet the needs of transportation.

[0004] When widening an old bridge, the main beam of the widened section usually adopts the same main beam structure as the old bridge. For bridges that use T-beams for widening, when the flange width of the T-beam is large and there are difficulties in transportation, hoisting or other aspects, the T-beam can be divided into two parts for construction: a precast I-beam main beam and a cast-in-place bridge deck beam. When constructing the cast-in-place bridge deck beam, a ground support platform needs to be erected, which will have a significant impact on ground traffic.

[0005] Therefore, this application proposes a formwork support structure for the cast-in-place bridge deck of an old bridge to solve the above problems. Utility Model Content

[0006] To overcome the above shortcomings, this utility model provides a formwork support structure for widening cast-in-place bridge decks of old bridges. It aims to solve the problem that existing formwork support structures for widening cast-in-place bridge decks of old bridges require the erection of a ground-based support platform during the construction of cast-in-place bridge deck beams, which can significantly impact ground traffic.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A formwork support structure for widening a cast-in-place bridge deck of an old bridge includes a main beam of the old bridge. A precast main beam is fixedly connected to one side of the outer wall of the main beam of the old bridge. A cast-in-place bridge deck beam is fixedly connected to the top of the precast main beam. One side of the outer wall of the cast-in-place bridge deck beam is fixedly connected to one side of the outer wall of the old bridge main beam. Brackets are fixedly connected to both sides of the outer wall of the precast main beam. Vertical rods, horizontal rods, and diagonal rods are fixedly connected to the inside of each bracket. A connecting plate is fixedly connected to the inside of each bracket. A support component is provided at the top of the bracket for supporting functions.

[0009] As a further description of the above technical solution: the support assembly includes a longitudinal beam and a top plate, the bottom of the top plate is fixedly connected to the top of the longitudinal beam, and the bottom of the longitudinal beam is fixedly connected to the top of the bracket;

[0010] As a further description of the above technical solution: both the precast main beam and the vertical rod have two sets of bolt holes inside, and both the precast main beam and the vertical rod are threaded with tie bolts inside, with the outer wall of the tie bolts threaded into the bolt holes;

[0011] As a further description of the above technical solution: a guardrail is fixedly connected to the top of the top plate.

[0012] Beneficial effects

[0013] This utility model has the following beneficial effects:

[0014] In this invention, through the coordination between precast main beams, cast-in-place bridge deck beams, brackets, vertical bars, horizontal bars, diagonal bars, connecting plates, longitudinal beams, and top plates, it achieves the effect of eliminating the need for ground-based scaffolding during the construction of cast-in-place bridge deck beams, thus avoiding disruption to ground traffic. Components such as brackets, support frame panels, and guardrails are all prefabricated in the factory and transported to the site for installation. The structure is simple and reliable, and installation and dismantling are convenient and quick, eliminating the need for on-site high-altitude welding work. This invention solves the problem of the need to erect ground-based scaffolding platforms during the construction of cast-in-place bridge deck beams when widening old bridges, which significantly impacts ground traffic, thus improving construction safety. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of a formwork support structure for a cast-in-place bridge deck for widening an old bridge, according to this utility model.

[0016] Figure 2 This is a schematic elevation view of a formwork support structure for a cast-in-place bridge deck for widening an old bridge, according to this utility model.

[0017] Legend:

[0018] 1. Old bridge main beam; 2. Precast main beam; 3. Bolt holes; 4. Cast-in-place bridge deck beam; 5. Bracket; 6. Vertical bar; 7. Horizontal bar; 8. Diagonal bar; 9. Connecting plate; 10. Longitudinal beam; 11. Top plate; 12. Tie bolt; 13. Guardrail. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Reference Figure 1 - Figure 2 This utility model provides an embodiment of a formwork support structure for widening a cast-in-place bridge deck, comprising a main beam 1 of the old bridge, a precast main beam 2 fixedly connected to one side of the outer wall of the main beam 1, a cast-in-place bridge deck beam 4 fixedly connected to the top of the precast main beam 2, one side of the outer wall of the cast-in-place bridge deck beam 4 fixedly connected to one side of the outer wall of the main beam 1, brackets 5 fixedly connected to both sides of the outer wall of the precast main beam 2, vertical rods 6 and horizontal rods 7 fixedly connected inside the brackets 5, and diagonal rods 8 fixedly connected inside the brackets 5. The internal fixed connection is a connecting plate 9, and the top of the bracket 5 is provided with a support component for support. The support component includes a longitudinal beam 10 and a top plate 11. The bottom of the top plate 11 is fixedly connected to the top of the longitudinal beam 10, and the bottom of the longitudinal beam 10 is fixedly connected to the top of the bracket 5. The precast main beam 2 and the vertical rod 6 are both provided with two sets of bolt holes 3. The precast main beam 2 and the vertical rod 6 are both threadedly connected with tie bolts 12. The outer wall of the tie bolts 12 is threadedly connected to the inside of the bolt holes 3. The top of the top plate 11 is fixedly connected with a guardrail 13.

[0021] Specifically, in the formwork support structure for the cast-in-place bridge deck of the old bridge widening project, the superstructure of the widened bridge consists of precast main beams 2 and cast-in-place bridge deck beams 4. The precast main beams 2 are precast components, requiring prefabrication at the prefabrication plant before being transported to the site for hoisting. The precast main beams 2 are installed on the outside of the old bridge's main beams 1. The web of the precast main beams 2 contains two rows of bolt holes 3 through which tie bolts 12 can pass. The diameter of the bolt holes 3 is larger than the diameter of the tie bolts 12, and these bolt holes 3 are pre-drilled during prefabrication. The cast-in-place bridge deck beams 4 are cast on-site components, cast onto the precast main beams 2. Simultaneously, one side of the cast-in-place bridge deck beams 4 is connected to the flange of the old bridge's main beams 1. The bracket 5 is composed of vertical rods 6 closely attached to the outside of the precast main beam 2, horizontal rods 7 installed above the vertical rods 6 and perpendicular to them, diagonal rods 8 installed between the vertical rods 6 and 7, and connecting plates 9 welded to the outside of the vertical rods 6 at positions corresponding to the tie bolts 12. The brackets 5 are installed in pairs at equal intervals along the length of the precast main beam 2 on both sides. The vertical rods 6, horizontal rods 7, and diagonal rods 8 are all double-channel steel structures with back-to-back webs, and the gap between the webs is larger than the diameter of the tie bolts 12. The bracket structure needs to be pre-welded into a whole in the factory and then transported to the site for installation. During installation, one on each side is connected. The brackets 5 are respectively attached tightly to both sides of the web of the precast main beam 2 and tightened with tie bolts 12. It is worth noting that the inner and outer brackets 5 should be distinguished during installation. The length of the crossbar 7 of the inner bracket 5 is greater than the width of the inner flange of the cast-in-place bridge deck beam 4, and the length of the crossbar 7 of the outer bracket 5 is equal to the sum of the width of the outer flange of the cast-in-place bridge deck beam 4 and the width of the operating platform. During installation, the support frame panel is installed above the brackets 5. The support frame panel consists of longitudinal beams 10 installed at equal intervals parallel to the direction of the precast main beam 2 and a top plate 11 welded to the longitudinal beams 10. It is worth noting that the length of the support frame panel along the direction of the precast main beam 2 is equal to the length of the crossbar 7 of the inner bracket 5. The spacing of the brackets 5 along the direction of the precast main beam 2, the support frame panel structure needs to be welded into a whole in the factory before installation. During installation, the inner and outer support frame panels should be distinguished. The width of the inner support frame panel is equal to the length of the crossbar 7 of the inner bracket 5, and the width of the outer support frame panel is equal to the length of the crossbar 7 of the outer bracket 5. The tie bolts 12 are installed horizontally in two layers in the gap between the bolt holes 3 of the precast main beam 2 and the vertical bar 6 of the bracket 5. The upper tie bolt 12 is installed at the top of the vertical bar 6, and the lower tie bolt 12 is installed at the bottom of the vertical bar 6. The guardrail 13 is installed at the top of the outermost side of the outer support frame panel along the length direction of the precast main beam 2.

[0022] Working principle: When using this type of old bridge widening cast-in-place bridge deck formwork support structure, the precast main beam 2 is first precast in the prefabrication plant, and after prefabrication, it is transported to the site for hoisting. The precast main beam 2 is installed on the outside of the old bridge main beam 1. After the precast main beam 2 is installed, the cast-in-place bridge deck beam 4 is poured on the top of the precast main beam 2. When pouring the cast-in-place bridge deck beam 4, one side of the cast-in-place bridge deck beam 4 should be connected to the flange plate of the old bridge main beam 1. The bracket 5 needs to be welded into a whole in the factory in advance and then transported to the site for installation. During installation, one bracket 5 on the inner and one on the outer side are respectively attached to both sides of the web of the precast main beam 2 and tightened with tie bolts 12. The support frame panel structure consists of longitudinal beams 10 arranged at equal intervals parallel to the direction of the precast main beam 2 and a top plate 11 welded to the longitudinal beams 10. It also needs to be welded into a whole in the factory in advance and then transported to the site for installation on the top of the bracket 5. Finally, the guardrail 13 is installed on the top of the outermost side of the outer support frame panel along the length direction of the precast main beam 2.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A support structure for a formwork of a cast-in-situ bridge deck widened by an old bridge, comprising an old bridge girder (1), characterized in that: The old bridge main girder (1) outer wall one side is connected with prefabricated main girder (2), the prefabricated main girder (2) top is connected with cast-in-place bridge deck beam (4), the cast-in-place bridge deck beam (4) outer wall one side is fixedly connected in the old bridge main girder (1) outer wall one side, the prefabricated main girder (2) outer wall both sides are fixedly connected with bracket (5), the bracket (5) inside is fixedly connected with vertical rod (6), the bracket (5) inside is fixedly connected with cross bar (7), the bracket (5) inside is fixedly connected with inclined rod (8), the bracket (5) inside is fixedly connected with connecting plate (9), the bracket (5) top is provided with support assembly.

2. The formwork support structure for widening an existing bridge with cast-in-place deck slabs according to claim 1, characterized in that: The support assembly includes longitudinal beam (10) and top plate (11), the top plate (11) bottom is fixedly connected on the longitudinal beam (10) top, the longitudinal beam (10) bottom is fixedly connected on the bracket (5) top.

3. The formwork support structure for widening an existing bridge with cast-in-place deck slabs according to claim 2, characterized in that: The prefabricated main girder (2) and vertical rod (6) inside are all provided with two groups of bolt holes (3), the prefabricated main girder (2) and vertical rod (6) inside are all connected with a pair of tension bolts (12) in threaded mode, the pair of tension bolts (12) outer wall is connected in threaded mode in the bolt hole (3) inside.

4. The formwork support structure for widening an existing bridge with cast-in-place deck slabs according to claim 3, characterized in that: The top plate (11) top is fixedly connected with guardrail (13).

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