JP2001146718A - Bridge floor slab projection moving and supporting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a form support capable of being smoothly and safely erected with high efficiency at a low cost without eliminating coherence with the existing handrail or an adjacent floor slab and facilitating the assembly and demolition work. SOLUTION: A holder is constructed as a two slide type of a lower slide holder 5 and an upper slide form support 6, both of them are monolithically assembled in a span of a pier, it is moved in the direction of a bridge axis to carry out work, an auxiliary slide guide is held in an interruption part of a slide guide 8 right above the pier, the lower slide holder 5 waiting in the opposite side of a main girder 3 is moved, and the slide guide 8 is connected to make it possible to smoothly move the slide form support 6 in the direction of the bridge axis. Stress occurring in the case of concrete casting is dispersed and absorbed by providing the base of an upper flange 3' of the main girder 3, and stretching a rod or a wire 14 between a scaffold hanging metal fixture 11 and the slide form support 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The disclosed technology belongs to the technical field of the structure of a movable form support for placing a concrete slab on a bridge.

[0002]

2. Description of the Related Art As is well known, in Japan, where there are many mountain forests and special terrain conditions approaching a long and intricate shoreline, in addition to agricultural and livestock farming, housing and The plains available for construction of production facilities are limited and, therefore, these facilities are scattered nationwide, so various types of transportation of goods and things between these various facilities are required. Roads and railways are laid nationwide in a network.

[0003] Many bridges must be constructed in order to provide the kind roads and railways, but when constructing concrete floor slabs for the kind bridges, the movable formwork supporting equipment is very large. Separately, there are two types, a hanger type and a support type. In many cases, the up lane and the down lane were constructed one by one according to the historical construction requirements of the bridge. In addition, a construction mode in which convenience is provided by being constructed in parallel with the upper and lower sides has been widely used.

[0004] In the former hanger-type pedestal, a work support for formwork support or movement must be hung from the projecting portions at both ends, and a hanger-type movable formwork shown in FIG. On the side of the shoring 1
And the frame suspended from the adjacent floor slab interfered with each other due to the narrow interval, and there was a problem that the construction was difficult.

A guide rail of the type hanger type, which is raised above the concrete thickness of the floor slab 20, is installed on the upper flange 3 'of the main girder 3 and, for example, has a structure in which a π-type frame with a pitch of about 2 m is connected. From the point of view, a method of lifting from the floor slab 20 with a rod or the like has to be adopted, and a support work for receiving the bottom formwork has to be performed, and the structure is so complicated that the work efficiency is deteriorated.

On the other hand, in the support type, the vertical weight is supported by the lower flange 3 '' of the main girder 3 and the upper flange 3 ''
The metal fittings provided in the above are mounted, and guide rails are attached to the metal fittings so as to bear the horizontal component force generated from the center portion of the overhang portion. There was an inconvenience that it could not be an obstacle to the laying work and concrete placing work.

Regardless of which type of movable formwork is used, scaffolds must be installed at each horizontal girder position for assembling, disassembling, and refilling the inner movable formwork. There is a disadvantage that it takes time and effort.

[0008]

It is an object of the invention of this application to provide a floor slab without deteriorating the quality of a slab overhang of a bridge, despite the small gaps between adjacent up and down lines based on the prior art. Improve the work efficiency by improving the work efficiency such as the construction of the head part and the dismantling work of the movable formwork, and the movable formwork construction that can be applied even when the adjacent up and down line new bridge is close. In the construction industry, it will be possible to efficiently make it possible to reduce the number of work scaffolds required for cross girder erection and the number of work scaffolds required for assembling the inner movable formwork. It is intended to provide an excellent bridge floor slab overhang moving support structure that is beneficial to the field of bridge construction work.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the construction of the invention of this application, which has the above-mentioned object and the scope of the appended claims, is to provide a moving scaffold having a beam structure which can move between spans. The slide base that also serves as a bridge deck slab overhang moving support structure having a slide form support at at least one of its both ends, and a slide base that is movable along the bridge axis direction below the main girder. The main girder is suspended from the lower flange via a roller or a slide mechanism, and a slide form supporter is provided on at least one of both ends of the lower slide base to support a slide guide provided on the lower slide base. Based on the fact that it is mounted so as to be freely movable in the axial direction, the slide form supporter may be disposed between the lower slide base and the outside of the main girder,
A scaffold is laid on the lower slide frame so as to be a movable girder lower scaffold, and the stress generated when concrete is poured between the overhang of the lower slide frame and the girder mounting bracket of the main girder. As a countermeasure, a rod or a wire can be freely suspended, and the slide guide of the lower slide base can be freely connected to a slide form support when the bridge over a fulcrum on a bridge girder. In a state where the lower slide base with respect to the fulcrum on the main girder is clamped from both sides, the slide form support can be moved in the bridge axis direction along the slide guide of the lower slide base. Also, the intermediate slide guide may be supplementarily clamped at an interruption portion of the slide guide of the pair of lower slide mounts, and Square in which took technical means also as is so movable along the slide guide of the slide frame.

[0010]

In the above construction, the movable platform is divided into a lower slide platform and a slide form support provided on the lower slide platform via a slide guide, and the lower slide platform is a main girder. Suspended via rollers and slide mechanism on the lower flange, it can be moved in the bridge axis direction during span, and the slide form support can be moved in the bridge axis direction along the slide guide installed on the lower slide stand. When moving between spans, the slide form support is fixed to the lower slide frame and moved integrally, and when moving over the bridge girder and the fulcrum, the lower slide frame is fixed across the pier, Only the frame support is moved in the direction of the bridge axis along the slide guide of the lower slide base, and the slide guide is used whenever the slide guide is interrupted on the main girder. The slide guide can be safely and easily extended by using a scaffold around the main girder, and the end of the slide guide is arranged to protrude from the lower slide base to about half of the pier. Also, when casting concrete, a relatively large bending stress acts on the lower slide base through the slide form support, so that it is attached to the base of the upper flange 3 ″ of the main girder to reduce the stress applied to each member. The scaffold suspension and the lower slide base overhang are connected by rods or wires so that stress is dispersed and flowed, and a scaffold 15 is laid on the lower slide base 5 to mount the cross beam 4 and move inwardly. It is designed to be used as a scaffold under the girder for assembly.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of embodiments of the present invention as embodiments of the present invention, with reference to FIGS. 1 to 6. FIG.

Reference numeral 5 denotes a lower slide base which forms the point of the invention of the present application, has a beam structure, is provided at the lower part of the floor slab, and has a work as shown in FIG. A floor 15 is laid, and slide guides 8, 8, 8, 8 of a predetermined length are provided in parallel on the overhanging portions at both ends in the bridge axis direction. Digit 3
Roller or slide mechanism 7, 7
Which are suspended outside the lower flange 3 '' of each of the main girders 3, and are suspended between the main girders 3 during assembly and disassembly work. Partially with the wire 13 by the winch 12 through the cross beam 4, or
It is to be done at once.

The slide guide 8 is provided with a slide form support 6 provided above the projecting portions at both ends of the lower slide base 5 with a taper projecting from the upper flange 3 'of the main girder 3. In the span between the parts 10 in the bridge axis direction, the slide form support 5 is integrally movable with the slide form support 5.

Therefore, as shown in FIG. 2, in the span between the piers 31, 31, the slide form support 6 and the lower slide gantry 5 move integrally in the bridge axis direction to perform a predetermined construction work. Have been to do.

When the concrete floor slab 20 is cast as a bridge, a concrete load or other relatively large stress acts on the lower slide base 5, so that the projecting portion of the lower slide base 5 and the main girder 3 are attached. A rod between a scaffold suspending fitting 11 provided inside the base of the upper flange 3 ′,
Alternatively, the wire 14 is stretched and tensioned, and the vertical force can be dispersed in response to the tension.

As shown in FIG. 2, various construction works in the span are performed by the lower slide base 5 and the slide form support 6.
Are integrated and various construction work is performed. As shown in (a), (b) and (c) of FIG.
Various construction work and floor slab placement work can be performed via the cross beam 4 and the slide form support 6.

In addition, (a) and (b) are the work of erection of the main girder 3 before the floor slab construction, and the lower slide gantry 5 can be used alone.

When starting the concrete placing operation of the floor slab 20, the slide form support 6 is set, and the lower slide base 5 and the slide form support 6 are integrated with the concrete of the floor slab 20. A casting operation is performed.

Therefore, in the invention of this application, means shown in FIGS. 4 to 6 are considered, and when the lower slide base 5 reaches the end point of the span, its end faces the pier 31. As shown in FIG. 6, the slide guide 8 is stopped by a length corresponding to the length of the fulcrums 19, 19, 19 on the upper part of the main girder 3 on the bridge pier 31. 8 ′ is externally provided as an outer arm, and both lower slide bases 5, 5
The slide form support 6 can be moved over the pier 31 in the bridge axis direction by connecting to the slide guide 8.

As shown in FIG. 6, a wide auxiliary slide guide which is longer than half of the width of the pier 31 is extended so as to face both ends of the pier 31 of the lower slide base 5 when both slide guides are opposed to each other. 8 'can be connected so that the slide form support 6 can be freely moved in the bridge axis direction by climbing over the pier 31. Further, as shown in FIG. The lower slide base 5 is the pier 31
The slide guide 8 can be appropriately connected at the point of time when the pier 31 can be passed over the pier 31 in the bridge axis direction of the slide form support 6.

In this way, only the movement in the bridge axis direction between the spans of the lower slide gantry 5 is performed and the pier 3 is moved.
1 can be moved in the direction of the bridge axis by the overriding, various constructions on the small main girder bridge can be smoothly performed, and a new construction part 18 connected to the existing construction part 17 shown in FIG. It can be performed without hindrance.

Further, by providing the working scaffold 15 on the frame of the lower slide stand 5, it can be used as a movable girder lower scaffold, and can also be used as a movable formwork.

Thus, in the invention of this application, a kind of support type is used, but it is not necessary to provide a work platform for each cross beam 4, which saves labor and is necessary for the conventional support type. The problem of supporting hardware and dismantling work can be solved.

In the span, the slide form support 6 and the lower slide gantry 5 are integrally moved in the direction of the bridge axis, and when the pier 31 is to be moved over, only the lower slide gantry 5 is fixed with the pier 31 interposed therebetween. It is possible to safely and easily climb over only the slide form support 6 along the slide guide 8 above the lower slide stand 5.

The work scaffold 15 can also be used as an undercarriage moving scaffold for erection of the cross beam 4 and for assembling, dismantling, and changing the inside movable formwork.

The lower slide stand 5 on the pier 31
When moving over, the combination of the lower slide frame 5 and the slide form support 6 is released integrally, and the slide form support 6 is moved to the lower slide mount 5 waiting on the opposite side of the main girder 3. It is also possible to end the ride.

[0027]

As described above, according to the invention of this application, a two-stage slide form support having a slide form support mounted on a lower slide base by using a type of support type for the mount is provided. By doing so, the upper slide form support with the two-stage slide method can smoothly move over the pier fulcrum and move in the bridge axis direction,
According to the invention of this application, no temporary hardware is required at all, and complicated auxiliary work is required if the conventional movable formwork requires the work of changing the rail on the girder and the rail base supporting the girder. In addition, the cost is reduced and safe construction can be performed. Although a lower slide base is originally required for each span, it is necessary to install a scaffold and to assemble, disassemble, and re-arrange the inner formwork by installing a scaffold on the device structure of the invention of this application. Such a conventional fixed scaffold is not required, and the assembling thereof provides an excellent effect that the work can be concentrated.

Further, there is no need for any hardware to be placed on the floor slab of the bridge or to be refilled, so that the work efficiency can be improved, the cost can be reduced, and the safety can be improved. Is played.

In addition, the number of components required for erection is omitted, and high-precision and high-efficiency construction can be performed while making full use of the advantages of cast-in-place concrete, thereby shortening the construction period and reducing costs.

[Brief description of the drawings]

FIG. 1 is a schematic half sectional view of a left and right connection of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part of FIG.

FIG. 3 is a side cross-sectional view of the construction process, (a) is a cross-sectional view of the connection of the girder, (b) is a cross-sectional view of the connection of the pier and the cross beam, and (c) is the construction side of the floor slab. It is sectional drawing.

FIG. 4 is a view showing one embodiment of a slide form supporting method over a pier.

FIG. 5 is a view showing another embodiment.

FIG. 6 is a view showing another embodiment.

FIG. 7 is a construction interference diagram of a floor slab overhang portion and an existing construction portion based on the prior art.

[Explanation of symbols]

 6 Lower slide stand 5 Slide form support 3 Main girder 3 '' Lower flange 7 Roller (slide mechanism) 8 Slide guide 11 Scaffolding hanging bracket 14 Rod (wire) 31 Bridge pier 8 'Auxiliary slide guide 15 Mobile girder lower scaffold

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D059 AA14 DD09 DD14 DD17 2E177 AA02 CB02 CB14 FA09 FA10 FB00

Claims (6)

[Claims] In a bridge floor slab overhanging portion moving supporting structure having a slide frame supporting structure on at least one of both ends thereof, a slide base also serving as a moving scaffold of a beam structure movable between spans is provided. At the lower part, a lower slide base movable along the bridge axis direction is hung from the lower flange of the main girder via a roller, and a slide form supporter is provided on at least one of the upper ends of both ends of the lower slide base. A bridge floor slab overhang movement supporting structure, wherein the bridge slab is movably mounted on a slide guide provided on a slide base. 2. The support structure for moving a bridge deck slab overhang according to claim 1, wherein a scaffold is laid on the lower slide base to serve as a movable girder scaffold. 3. The bridge according to claim 1, wherein a rod or a wire is freely suspended between the end overhang of the lower slide stand and the scaffold suspension fitting with a girder of the main girder. Floor slab overhang moving support structure. 4. The support structure according to claim 1, wherein the slide guide of the lower slide base is connectable to the slide form support when the bridge pier fulcrum is passed. . 5. The slide form supporter is movable in the bridge axis direction along a slide guide of the lower slide gantry while a lower slide gantry with respect to a fulcrum on the pier is sandwiched from both sides. The bridge floor slab overhang moving support structure according to claim 4, characterized in that: 6. The bridge floor slab overhanging part according to claim 3, wherein an intermediate slide guide is inserted between the slide guide breaks of said pair of lower slide bases. Shoring structure.