CN103362069A - Steel and concrete combined box girder concrete wing plate formwork and construction method - Google Patents

Abstract

A steel-concrete combined box girder concrete wing plate formwork and a construction method thereof. The template includes a plurality of supporting beams, a plurality of supporting longitudinal beams, two columns of supporting columns, a plurality of tie rods, a plurality of nuts, a plurality of gaskets, a plurality of flutes, a plurality of steel cover plate brackets and a plurality of steel cover plates. The steel-concrete combined box girder concrete wing plate formwork and construction method of the present invention is to install a steel cover plate on the top plate of the steel box girder that has been erected, so that the steel cover plate and the steel box girder form a formwork system, which can not only solve the problem of cross-road construction. The problem of bracket construction, and in the specific construction, there is no need for large-scale hoisting equipment to cooperate, and the installation can be completed only by manual operation, and the elevation of the bottom mold can be adjusted very conveniently and accurately, so the precision is high. In addition, for wing plates of different sizes, it is only necessary to make formwork equipment of different specifications. The formwork equipment materials used are less, and they are all commonly used engineering structural steel. The construction cost is low.

Description

Steel-concrete combined box girder concrete wing plate formwork and construction method

technical field

The invention belongs to the technical field of bridge construction auxiliary equipment, in particular to a steel-concrete combined box girder concrete wing plate template and a construction method.

technical background

With the rapid development of bridge construction, steel-concrete combined box girders are common. The wing plate is the main component of the steel-concrete box girder, and the wing plate formwork becomes an important component in the construction of the steel-concrete box girder. At present, the commonly used wing plate construction method is to use the bracket method to set up a door-shaped wing plate formwork system on the main road for construction work. However, this method requires the cooperation of the crane, and at the same time requires that there must be a site suitable for the hoisting operation under the bridge, and the hoisting operation has a great impact on the road traffic. When it is difficult to select the working site for the crane, the installation of the wing plate formwork will be extremely difficult. In addition, this construction method is not only difficult to guarantee the construction safety for the main road with a large traffic flow, but also increases the construction cost due to the long period of installation and removal of the support in the construction of the support method. In addition, the safety risk is also relatively large when the method is used for wing construction.

Contents of the invention

In order to solve the above problems, the object of the present invention is to provide a steel-concrete combined box girder concrete wing formwork and a construction method that is easy to manufacture, easy to use, high in precision, and can shorten the construction period.

In order to achieve the above purpose, the steel-concrete combined box girder concrete wing formwork provided by the present invention includes multiple supporting beams, multiple supporting longitudinal beams, two columns of supporting columns, multiple tie rods, multiple nuts, multiple gaskets, multiple Longitudinal corrugation, multiple steel cover plate brackets and multiple steel cover plates; two rows of supporting columns are symmetrically installed on the outer edge of the top plate of the two steel box girders that have been erected along the longitudinal direction of the bridge, and the top surface of the upper end A steel plate is provided, and a supporting longitudinal beam is horizontally installed on the steel plate in the same direction as the supporting column; multiple supporting beams are horizontally installed on the top of the supporting longitudinal beam at equal intervals along the transverse direction of the bridge; the steel cover plate bracket is a rod-shaped structure , a hook is formed at the lower end, and the two ends of each supporting beam are respectively connected with the middle part of a steel cover plate bracket by connecting bolts, and the hook tip on the hook faces inward; one end of the steel cover plate as the bottom mold is placed in a On the outer edge of the top plate of the steel box girder, the other end is placed on the hooks of multiple steel cover plate brackets on the same side as the steel box girder; at least two The longitudinal corrugation; the tie rods are vertically set through the longitudinal corrugation and the supporting beam, and the lower end is connected to the steel cover plate, and the upper end is fixed by a gasket and a nut.

The connection between the support column and the top plate of the steel box girder, the support longitudinal beam and the steel plate on the top surface of the support column, the support beam and the support longitudinal beam all adopts welding method.

The supporting columns, supporting longitudinal beams and supporting beams are all made by welding two channel steels side by side.

The steel-concrete combined box girder concrete wing plate formwork construction method provided by the invention includes the following steps carried out in order:

1) First, install two rows of supporting columns symmetrically along the longitudinal direction of the bridge on the outer edge of the roof of the two steel box girders that have been erected.

2) Install a support longitudinal beam in the same direction as the support column on the steel plate on the top surface of each row of support columns, and weld the lower end to the support column;

3) On the top of the supporting longitudinal beams, multiple supporting beams are installed horizontally at equal intervals along the transverse direction of the bridge, and the lower ends are welded to the supporting longitudinal beams;

4) Connect the two ends of each supporting beam with the middle part of a steel cover bracket with connecting bolts, and the hook tip of the hook on the steel cover bracket faces inward;

5) Place one end of the steel cover plate on the outer edge of the top plate of a steel box girder, and place the other end on the hooks of multiple steel cover plate brackets on the same side as the steel box girder to temporarily fix the steel cover plate ;

6) Set at least two longitudinal corrugations on the top of multiple supporting beams directly above the steel cover, and then connect the tie rods through the longitudinal corrugations and supporting beams at the same time, and connect their lower ends to the steel cover;

7) Use the method of rotating the pull rod to adjust the elevation of the steel cover plate. After the adjustment of the elevation is completed, fix the upper end of the pull rod on the longitudinal corrugation with gaskets and nuts;

8) Weld and fix the contact between the steel cover plate and the top plate of the steel box girder, thus making the steel-concrete combined box girder concrete wing plate formwork;

9) Finally, in the space above the steel cover slab, bind the reinforcement of the concrete wing slab and pour concrete. After the concrete reaches the design strength, the concrete wing slab will be formed. Finally, the concrete wing slab formwork of the steel-concrete combined box girder will be removed in the reverse order of the above steps. The construction process can be completed.

The support columns, support longitudinal beams and support beams are all formed by welding two No. 20 channel steels side by side; the longitudinal corrugations use No. 10 channel steels;

The steel-concrete combined box girder concrete wing slab formwork and construction method provided by the invention are to install a steel cover plate on the top plate of the erected steel box girder, so that the steel cover plate and the steel box girder form a formwork system, which can not only solve the problem of cross-road construction There is no problem with the construction of the bracket, and in the specific construction, there is no need for large-scale hoisting equipment to cooperate, and the installation can be completed only by manual operation, and the elevation of the bottom mold can be adjusted very conveniently and accurately, so the precision is high. In addition, for wing plates of different sizes, it is only necessary to make formwork equipment of different specifications. The formwork equipment materials used are less, and they are all commonly used engineering structural steel. The processing difficulty is small, the use is simple, and it is conducive to on-site construction. The construction cost is low.

Description of drawings

Fig. 1 is the elevation view of the formwork structure of the steel-concrete combined box girder concrete wing plate provided by the present invention.

Fig. 2 is a structural plan view of the steel-concrete combined box girder concrete wing plate formwork provided by the present invention.

Detailed ways

The steel-concrete combined box girder concrete wing plate template and construction method provided by the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Now take a certain project as an example: the project is located above the Fifth Ring Road in Beijing, in the middle of the Meishikou Highway Bridge, and uses a 36m steel-concrete combined box girder. Due to the construction of the box girder spanning the Fifth Ring Road, the construction process is affected by the traffic on the Fifth Ring Road, and the construction of the concrete wing plate is very difficult. During construction, it is considered that the bottom formwork of the wing plate should be in the form of non-demolition steel formwork, so as to reduce the span of five rings. Difficulty of ring road construction. The length of the flanges on both sides of the steel box girder is 2.358m, so the length of the concrete flange formwork of the steel-concrete composite beam is 2.358m.

As shown in Figures 1-2, the steel-concrete combined box girder concrete wing formwork provided by the present invention includes multiple supporting beams 1, multiple supporting longitudinal beams 2, two columns of supporting columns 3, multiple tie rods 4, and multiple nuts 5. Multiple gaskets 6, multiple longitudinal corrugations 7, multiple steel cover plate brackets 8 and multiple steel cover plates 10; two columns of support columns 3 are symmetrically installed on the two erected columns at equal intervals along the longitudinal direction of the bridge. On the outer edge of the top plate of the steel box girder 11, a steel plate is arranged on the top surface of the upper end, and a support longitudinal beam 2 with the same arrangement direction as the support column 3 is horizontally installed on the steel plate; multiple support beams 1 are equidistant along the transverse direction of the bridge Horizontally installed on the top of the supporting longitudinal beam 2; the steel cover bracket 8 is a rod-shaped structure, and a hook 12 is formed at the lower end, and the two ends of each supporting beam 1 are respectively connected by connecting bolts 9 and a steel cover bracket 8 The middle part is connected, and the hook point on the hook 12 is inward; one end of the steel cover plate 10 as the bottom mold is placed on the outer edge of the top plate of a steel box girder 11, and the other end is placed on the same side of the steel box girder 11. On the hook 12 of a steel cover bracket 8; on the top of a plurality of supporting beams 1, at least two longitudinal corrugations 7 are arranged at the position directly above the steel cover 10; And the lower end is connected on the steel cover plate 10, and the upper end is fixed by the gasket 6 and the nut 5.

The connections between the support column 3 and the top plate of the steel box girder 11, the support longitudinal beam 2 and the steel plate on the top surface of the support column 3, the support beam 1 and the support longitudinal beam 2 are all welded.

The supporting columns 3, the supporting longitudinal beams 2 and the supporting beams 1 are made by welding two channel steels side by side.

The distance between the adjacent supporting beams 1 is 1.250m.

The steel-concrete combined box girder concrete wing plate formwork construction method provided by the invention includes the following steps carried out in order:

1) First, install two rows of supporting columns 3 symmetrically along the longitudinal direction of the bridge on the outer edge of the roof of the two steel box girders 11 that have been erected. The supporting columns 3 are formed by welding two No. 20 channel steels side by side. On the top plate of the steel box girder 11, a steel plate is arranged on the top surface of the upper end;

2) On the steel plate on the top surface of each support column 3, install a support longitudinal beam 2 in the same direction as the support column 3. The support longitudinal beam 2 is formed by welding two No. 20 channel steels side by side, and the lower end is welded together. on the support column 3;

3) Multiple supporting beams 1 are horizontally installed at equal intervals along the transverse direction of the bridge on the top of the supporting longitudinal beam 2. The supporting beam 1 is composed of two No. The distance between adjacent support beams 1 is 1.250m;

4) The two ends of each supporting beam 1 are respectively connected with the middle part of a steel cover bracket 8 by connecting bolts 9, and the hook tip of the hook 12 on the steel cover bracket 8 faces inward;

5) Place one end of the steel cover plate 10 on the outer edge of the top plate of a steel box girder 11, and place the other end on the hooks 12 of multiple steel cover plate brackets 8 on the same side as the steel box girder 11, so as to Steel cover plate 10 is temporarily fixed;

6) Set at least two longitudinal corrugations 7 at the top of the multiple supporting beams 1 directly above the steel cover plate 10, the longitudinal corrugations 7 use No. , the tie rod 4 adopts No. 20 fine-rolled rebar, and its lower end is connected to the steel cover plate 10;

7) Adjust the elevation of the steel cover plate 10 by rotating the pull rod 4, and fix the upper end of the pull rod 4 on the longitudinal flute 7 with the gasket 6 and the nut 5 after the elevation adjustment is completed;

8) Weld and fix the contact between the steel cover plate 10 and the top plate of the steel box girder 11, thereby making a steel-concrete combined box girder concrete wing plate template;

9) Finally, in the space above the steel cover plate 10, bind the reinforcement of the concrete wing plate and pour concrete. After the concrete reaches the design strength, the concrete wing plate will be formed. Finally, the concrete wing plate of the steel-concrete combined box girder will be removed in the reverse order of the above steps. Formwork can complete the entire construction process.

Claims (6)

1. a steel reinforced concrete is characterized in that in conjunction with box beam concrete wing plate template: described steel reinforced concrete comprises many supporting traverses (1), many support stringers (2), two be disbursed from the cost and expenses support column (3), many pull bars (4), a plurality of nut (5), multi-disc pad (6), many vertical stupefied (7), a plurality of steel deck-plate carriage (8) and polylith steel deck-plates (10) in conjunction with box beam concrete wing plate template; Wherein the two support columns (3) of being disbursed from the cost and expenses are installed on the top board outer ledge of two steel case beams (11) that set up along the vertically equidistantly symmetry of bridge, the upper end end face is provided with steel plate, and is horizontally installed with a support stringer (2) identical with support post (3) orientation on the steel plate; Many supporting traverses (1) are installed in the top of support stringer (2) along the laterally equidistant level of bridge; Steel deck-plate carriage (8) is rod shaped structure, and the lower end is formed with a hook (12), and the two ends of every supporting traverse (1) utilize respectively coupling bolt (9) to be connected with the middle part of a steel deck-plate carriage (8), and the bill on the hook (12) is inside; Steel deck-plate (10) one ends as bed die place on the top board outer ledge of a slice steel case beam (11), and the other end places on the hook (12) with a plurality of steel deck-plate carriages (8) of this steel case beam (11) the same side; The position that is positioned on the top of many supporting traverses (1) directly over the steel deck-plate (10) arranges at least two vertical stupefied (7); Pull bar (4) vertically runs through vertical stupefied (7) and supporting traverse (1) arranges, and the lower end is connected on the steel deck-plate (10), and the upper end utilizes pad (6) and nut (5) to fix.

2. steel reinforced concrete according to claim 1 is characterized in that in conjunction with box beam concrete wing plate template: being connected between steel plate, supporting traverse (1) and the support stringer (2) on top board, support stringer (2) and support post (3) end face of described support post (3) and steel case beam (11) adopted welding manner.

3. steel reinforced concrete according to claim 1 is characterized in that in conjunction with box beam concrete wing plate template: described support post (3), support stringer (2) and supporting traverse (1) are made by two channel-section steels weld side by side.

4. steel reinforced concrete according to claim 1 is characterized in that in conjunction with box beam concrete wing plate template equipment: the distance between the described adjacent supports crossbeam (1) is 1.250m.

5. a steel reinforced concrete as claimed in claim 1 is in conjunction with the job practices of box beam concrete wing plate template, and it is characterized in that: described job practices comprises the following step that carries out in order:

1) at first along bridge vertical symmetrical the two support columns (3) of being disbursed from the cost and expenses are installed on the top board outer ledge of two steel case beams (11) that set up, the lower end is welded on the top board of steel case beam (11), and at the upper end end face steel plate is set;

2) level is installed a support stringer (2) identical with support post (3) orientation on the steel plate of support column (3) end face of whenever being disbursed from the cost and expenses, and the lower end is welded on the support post (3);

3) along the transverse horizontal of bridge many supporting traverses (1) are installed equidistantly at the top of support stringer (2), the lower end is welded on the support stringer (2);

4) utilize respectively coupling bolt (9) to be connected with the middle part of a steel deck-plate carriage (8) at the two ends of every supporting traverse (1), and the bill of the upper hook of steel deck-plate carriage (8) (12) is inside;

5) end with steel deck-plate (10) places on the top board outer ledge of a slice steel case beam (11), and the other end places on the hook (12) with a plurality of steel deck-plate carriages (8) of this steel case beam (11) the same side, so that steel deck-plate (10) is temporary fixed;

6) position directly over the top of many supporting traverses (1) is positioned at steel deck-plate (10) arranges at least two vertical stupefied (7), then pull bar (4) is run through simultaneously vertical stupefied (7) and supporting traverse (1), and its lower end is connected on the steel deck-plate (10);

7) utilize the mode of rotating rod (4) to regulate the absolute altitude of steel deck-plate (10), the upper end with pull bar (4) after the absolute altitude adjustment is finished utilizes pad (6) and nut (5) to be fixed on vertical stupefied (7);

8) the top board contact position of steel deck-plate (10) with steel case beam (11) is welded and fixed, makes thus steel reinforced concrete in conjunction with box beam concrete wing plate template;

9) at last colligation concrete flange plate reinforcing bar and fluid concrete in the space of steel deck-plate (10) top, after concrete reaches design strength, namely form concrete flange plate, remove this steel reinforced concrete according to the opposite order of above-mentioned steps at last and can finish whole work progress in conjunction with box beam concrete wing plate template.

6. job practices according to claim 5, it is characterized in that: described support post (3), support stringer (2) and supporting traverse (1) all adopt two No. 20 channel-section steels to weld together side by side and consist of; Vertical stupefied (7) adopt No. 10 channel-section steels; Pull bar (4) adopts No. 20 fining twisted steels.

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