JPH0136568Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to formwork for precast deck slabs for road bridges, etc.

One of the construction methods for road bridges, etc. is to precast the deck slabs that make up the road surface structure, manufacture these individual precast deck slabs in advance at a factory or near the site, and then transport them to the site and install them on the top of the main girder. The construction method is known.

This construction method eliminates the need for on-site scaffolding, support, reinforcing, and concrete pouring by performing some of the work outside the site, and has recently been widely adopted because it shortens the construction period and saves labor. ing.

By the way, among the precast slabs constituting the above-mentioned slabs, those used for parts of road bridges that gradually expand or contract, such as confluence points, are shaped gradually (especially when they are adjacent to each other). The length in the width direction) is different. Therefore, the shape of the formwork used when pouring and manufacturing precast slabs such as those at the above-mentioned merging points must be changed little by little to suit each different precast slab.

Conventionally, the above-mentioned formwork for precast deck slabs has been manufactured individually to suit the shape of each precast deck slab, which is extremely time-consuming and a major obstacle in reducing costs and shortening the construction period. I was getting used to it.

The present invention was made in view of the above circumstances, and consists of a formwork for precast deck slabs consisting of a common part, which is a corbel molded part, and a non-common part, which is a flat molded part, and the corbel molded part has a V-shaped cross section. By arranging the flat bottom plate between the bottom plates in a removable and adjustable corner part, and by arranging the support member that supports the flat bottom plate under the flat bottom plate so that it can move up and down, the requirements for each precast floor slab can be met. The purpose of the present invention is to provide a formwork for precast deck slabs for road bridges, etc., which can be obtained very easily and in a short time, and which can reasonably reduce costs and shorten the construction period.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 16.

_{FIG .} 1 is a diagram showing _a formwork for a precast deck slab in a road bridge according to the present invention _.
Flat molded parts F ₁ to _{F 3} removably interposed between
It is composed of. Haunch forming part H ₁ ~ _{H 4}
are the main girder A of the road bridge as shown in Figure 2.
The so-called corbel installed on the top of the corbel and the part that makes the upper part are commonly used for all precast slabs. On the other hand, the flat molded parts F ₁ to _{F 3} are
The length is determined according to each precast slab, and its value is determined according to the interval _L1 between the main girders A.

To explain the haunch forming part _H1 , as shown in FIG. The bottom plate 2 on the right side of the figure is fixedly provided, and the right end portion of the bottom plate 3 on the left side is rotatably provided via a hinge or the like.
Further, as shown in FIG. 5, the lower flange 4 of the bottom plate 3 is bolted to the pedestal 1, so that the angle θ ₁ between the bottom plate 3 and the horizontal plane can be arbitrarily set. On both sides of the bottom plates 2 and 3 there are side plates 5,
6 are fixedly provided, and a side plate 7 is provided movably in the directions of arrows A and B at one end of the bottom plate 3 in the width direction, that is, the left end in FIGS. 3 and 4. This side plate 7 has a structure in which it is divided into three parts in the vertical direction, and a circular hole 7a is formed by providing a semicircular notch in the mutually abutting part of the members constituting the side plate 7. As a result, one end of the reinforcing bar arranged inside the formwork can be projected to the outside, and the reinforcing bar can be positioned. Furthermore, a movable bottom plate (flat bottom plate) 8 is removably disposed between the bottom plates 2 and 3 for producing the lowermost surface of the corbel. This movable bottom plate 8 has a width dimension l ₂ determined individually for each precast floor slab, is movable in the directions of arrows A and B in FIGS. 3 and 4, and has an angle θ ₂ with the horizontal plane. can be set arbitrarily.
Further, a support member for supporting the movable bottom plate 8 is attached to the lower end of the movable bottom plate 8 by bolts 9a and nuts 9b so as to be movable in the directions of arrows C and D in FIGS. 3 and 7.

The haunch molding part H ₂ is made up of the pedestal 11 and this pedestal 1.
Bottom plates 12 and 13 fixedly arranged on the top of 1
and side plates 14 and 15 fixedly disposed above both sides of these bottom plates 12 and 13. Further, a movable bottom plate 16 is disposed between the bottom plates 12 and 13, and this movable bottom plate 16 has a width dimension l ₃ similar to the movable bottom plate 8 of the haunch forming part H ₁ .
is determined individually for each precast floor slab, and is movable in the directions of arrows A and B, and the angle θ ₃ with respect to the horizontal plane can be set arbitrarily.
Note that 17 is a support member which is movable in the directions of arrows C and D.

On the other hand, the flat molded part _F1 includes a bottom plate 21 and side plates 2 fixedly disposed on both sides of the bottom plate 21.
It is composed of 2 and 23. As shown in FIG. 8, this flat molded part _F1 is also connected to the haunch molded part _H2 by bolting the lower flange 21a to the lower flange 2a of the bottom plate ₂ of the haunch molded part H1. has been done.

In addition, the haunch molded parts H ₃ and H ₄ and the flat molded part
Since the configurations of F ₂ and F ₃ are the same as those described above, the explanation thereof will be omitted.

Next, the case of pouring and manufacturing each precast deck slab using the above-mentioned formwork will be described.

(i) If a road bridge changes with a gentle slope and you want to install precast deck slabs with gradually different haunch heights according to the change in slope, use haunch forming part _H2 as an example. To explain,
As shown in FIGS. 9 and 10, the bottom plate 12,
Width dimensions according to each precast floor slab between 13
A movable bottom plate 16 of _l3 is disposed, and the central lower end of the movable bottom plate 16 is supported by a support member 17 that is vertically adjustable. That is, by selecting the movable bottom plate 16 with an appropriate width dimension and supporting this movable bottom plate 16 with the support member 17, the corbel height h ₁ can be freely adjusted even though the same formwork is used. The desired formwork for precast deck slabs can be easily obtained.

(ii) If you want to obtain precast slabs to be used at locations where the width of a road bridge gradually changes, such as at a confluence point, and where the spacing _l1 between main girders A gradually changes, please refer to Figures 11 and 11. As shown in Fig. 12, the length l ₄ of the flat molded parts F ₁ , F ₂ , F 3 is determined according to the dimension between the main girders A at the location where the flat molded parts F ₁ , F ₃ are to be installed. ₂ , _F3 to haunch forming part _H1 to _H4
Interpose it in between. Thereby, the dimensions between the haunches and the overall length of the formwork can be set freely, and a desired formwork for precast deck slabs can be easily obtained.

(iii) If you want to obtain a precast slab where the length _l5 of the overhang B from the outside main girder to the end of the bridge, such as a curved bridge, is arbitrary and the height _h2 of the end of the overhang B is constant, As shown in FIGS. 13 and 14, the angle θ ₁ between the bottom plate 3 and the horizontal plane is set according to the requirements of each precast slab, and the side plate 7
is moved in the directions of arrows A and B and placed at a predetermined location. Thereby, the height _h2 of the end of the overhanging part B can be made constant, and the length _l5 of the overhanging part B can be freely set, so that a desired formwork for a precast deck slab can be easily obtained.

(iv) If the slope is steep and you want to obtain a precast slab where the top surface of the slab and the bottom of the corbel intersect at an angle θ ₄ as shown in Figure 15, the corbel forming part H ₂
To explain this using an example, as shown in FIG. 16, a movable bottom plate 16 having an appropriate width l ₃ is disposed offset by an angle θ ₄ with respect to the horizontal plane, and the lower surface of this movable bottom plate 16 is moved vertically. It is supported by an adjustable support member 17. Thereby, a desired formwork for precast deck slabs can be obtained.

Note that even if the conditions (i) to (iv) above are combined in a complex manner, they can be easily dealt with by combining their individual measures.

As explained above, according to the formwork for precast deck slabs for road bridges, etc. according to the present invention, there are corbel molding parts that are commonly used in each precast deck slab, and a corbel molding part that is removably interposed between these haunch molding parts. It also has a flat molded part made to a unique length to correspond to each precast floor slab, and the flat bottom plate is removable and angle adjustable between the bottom plates with a V-shaped cross section of the haunch molded part. At the same time, the supporting member supporting the flat bottom plate is arranged under the flat bottom plate so that it can move up and down, so the dimensions between the corbels differ depending on the individual precast slabs, and the corbel forming Formworks having different shapes can be obtained extremely easily and in a short time, and as a result, costs can be reduced and construction period can be reasonably shortened.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Figure 1 is an overall front view, Figure 2 is a sectional view showing the precast deck installed on the main girder, and Figure 3 is the left half of Figure 1. , FIG. 4 is a plan view of the left half of FIG. 1, FIG. 5 is a view taken along the - line in FIG. 3, FIG. 6 is a sectional view taken along the - line in FIG. 3, and FIG. is the third
FIG. 8 is an enlarged detailed view of the circular portion in FIG. 3, and FIGS. 9 to 16 are explanatory views for explaining the operation thereof. H ₁ to _{H 4} ... Haunch molded part, F ₁ - F ₃ ... Flat molded part, A ... Main girder, 1 ... Frame, 2, 3 ... Bottom plate, 5, 6, 7 ... Side plate, 8 ...Movable bottom plate (flat bottom plate), 12,13...Bottom plate, 14,15...Side plate, 16...Movable bottom plate, 21...Bottom plate, 22,2
3...Side plate.

Claims (1)

[Scope of utility model registration request] In the formwork of reinforced concrete precast deck slabs that are interconnected to form the deck slabs of road bridges, etc., the corbel molding parts that are commonly used when pouring and manufacturing each precast deck slab, and the spaces between these corbel molding parts. and a flat molded part which is removably interposed in the plate and which is manufactured to a unique length for each precast floor slab, and the haunch molded part has a bottom plate with a V-shaped cross section, and the V-shaped The shaped bottom plate is provided with a flat bottom plate that is removable and adjustable in angle.
A formwork for a precast deck slab for a road bridge or the like, characterized in that a support member for supporting the flat bottom plate is arranged under the flat bottom plate so as to be movable up and down.