JPH0849417A - Method for installing formwork during construction of arch concrete - Google Patents

Abstract

PURPOSE:To increase the efficiency of installing formwork during construction of arch concrete. CONSTITUTION:To install arched formwork B over timbering A installed between opposite leg structures 1, 1, form blocks b1 to b4 equal in size to a plurality of pieces into which the formwork B is divided are joined together. After being assembled on the ground, the form blocks b1 to b4 are sequentially hoisted onto the timbering A by a crane and secured in place so that the overall formwork B is constructed and installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a formwork body which is used in the construction of arch concrete such as an arch bridge, efficiently and safely.

[0002]

2. Description of the Related Art In the construction of arch concrete such as an arch bridge, as shown in FIG. 1, for example, as shown in FIG. 1, both lower ends of an arch-shaped supporting work A of a truss structure are supported by leg structures 1, 1 such as abutments and piers. After installing the formwork B on the support A, the concrete of the arch concrete C is laid on the formwork B by placing the concrete.

In order to install the above-mentioned formwork, on the support A, the vertical flaps 7, 7 curved in an arch shape are placed on the support A.
Are arranged at intervals in the depth direction of, and are fixed to the supporting work A via a large number of support tools 10, 10, respectively, and a large number of horizontal flap materials 8, 8 are arranged on these vertical flap materials 7, 7. Then, the form frame plate 9 such as a veneer plate is mounted on it, and in this work, each member is carried up on the support work A, and manually assembled and mounted.

[0004]

As described above, the installation of the conventional formwork body is almost manual work, requires a lot of labor and time, and is extremely high at a high place and on an arch slope. Since it is carried out on a poor footing, workability is poor and the risk rate is high.

The present invention has been made in order to solve the above-mentioned problems in the conventional form installation, and forms a block of the form on the ground, and carries the block on a support work to assemble it. It is intended to greatly reduce the work done by humans on the work, and to improve the efficiency and safety of formwork installation.

[0006]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. In installing the formwork B of the concrete C, formwork blocks b _{1 to} b _{4 each} having a size obtained by dividing the formwork B into a plurality of pieces are continuously formed to form each formwork block b. _{It is characterized in that 1 to} b ₄ are formed on a flat place such as the ground, and then suspended and fixed on the support A to form the entire form B.

According to the installation method of claim 2, when installing the form B of arch concrete C on the support A, a part of the form B is replaced with the form blocks b ₁ and b _4. As a result, the composition is made on a flat place such as on the ground, and after the composition is hung and fixed on the support A ₁ , the remaining part of the form b
It is characterized in that ₀ is formed on the supporting structure A to form the entire form B.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a case where arch concrete is constructed using an arch-like support structure having a truss structure, and FIG. 4 is a partially enlarged view of FIG. The support work A is erected by pin-connecting both lower ends to the leg structure 1, 1 such as an opposing abutment via mounting bases 2, 2. Then, the form frame B is installed on the upper surface of the supporting work A, and the reinforcing frame is laid on the form frame B, and concrete is poured to form arch concrete C.

The supporting works A are arranged at intervals in the width direction (depth direction) of the arch concrete C on which a plurality of arch-shaped truss frame structures a are to be constructed, and are connected to the leg structures 1 and 1 by pins. In addition, they are connected to each other by a connecting member and a diagonal member (both not shown). The supporting work A shown in the figure is that the supporting elements 3 formed in a triangular shape by the upper chord member 4 and the pair of side rods 5 and 5 are arranged on top of each other.
Although the structure is such that they are connected to each other and the connecting ends of the side rods 5 and 5 are connected to each other by the lower chord members 6 and 6, this support A may be a general truss structure by a conventionally known means. . Further, the support work A is not limited to the truss structure as described above, and may be a structure in which a large number of columns are erected on the ground and the upper end is formed in an arch shape.

A mold frame B is installed on the upper surface of the supporting structure A constructed as described above. This form B is generally a support tool 10, in which a number of vertical flaps 7, 7 are adjustable along the span direction on each truss frame structure a, a constituting the support A, Placed via 10, mounting bolts 11,
11 by fixing, and a large number of horizontal flaps 8, 8 are arranged and fixed on the vertical flaps 7, 7 so as to form a grid pattern with the vertical flaps 7, 7, and are then fixed on the horizontal flaps 8, 8. The form board 9 is attached and installed.

In the present invention, as shown in FIG. 1, the form B is divided into a plurality of pieces in the span direction of the support A, for example.
Forming form blocks b _{1 to} b ₄ of each divided size,
It is constructed by arranging it continuously on support work A.

The above mold blocks b _{1 to} b ₄ are formed on a flat surface such as the ground. Fig. 2 shows an example of this. On the ground, there are prepared assembling bases 12, 12 whose upper surface is a curved surface that follows the arch shape of the form block. Form block to be placed in d
Composition ₁ and d ₄ . In this case, the vertical flap members 7, 7 are arranged at intervals so as to be placed on each truss frame structure a, a. Then, as in the conventional case, the horizontal flap members 8, 8 are arranged and fixed on the vertical flap members 7, 7 and the mold 9 is attached.

Next, as shown in FIG. 3, the mold blocks b ₁ and b ₄ whose composition has been finished are respectively lifted by a crane (not shown) and placed on the support A. At that time, attach the vertical flap material 7, 7 and the upper chord material 4 of the supporting work A to the mounting bolts 11, 11
And the mold block blocks b ₁ and b ₄ are fixed.
While hoisting and installing the form blocks b ₁ and b ₄ , if possible, the next form blocks b ₂ and b on the ground.
Do the composition of ₃ .

Subsequently, the formed mold blocks d ₂ , d ₃
Is lifted by a crane, placed on the support A via the support tools 10 and 10, and fixed by the mounting bolts 11 and 11. Thereby, as shown in FIG. 1, the placement of the entire mold frame B is completed. After placing the mold body B, an appropriate bar arrangement (not shown)
And place concrete, arch concrete C
Is built.

In the above-mentioned embodiment, the form B is divided into four in the span direction of the support A to form the form blocks b _{1 to} b ₄ , but the number of divisions is the size of the crane. The mold block B can be appropriately increased or decreased in consideration of the workability, and the mold block B can be further divided into the width direction (depth direction) of the support work A to form a mold block. The composition of the mold blocks b _{1 to} b ₄ can be performed without using the assembling table 12 as long as the conditions on the ground are good.

Next, according to the present invention, all of the formwork bodies B to be installed on the support work A are carried out by hoisting and connecting the formwork blocks b _{1 to} b _{4 formed} on the ground as described above. Instead, part of the range, for example, the formwork block is hung up and installed only on the part where the work is particularly difficult, such as near the ends of the steep support on the arch slope, and the other parts are the same as before.
It can be installed by a manual work on the support work A.

Explaining the embodiment in this case, as shown in FIG. 5, the form body B is provided with portions b ₁ and b ₄ near the steep ends of the arch slope on the support A and the remaining portion b _0. In the portions near both ends, the form blocks b ₁ and b ₄ are composed on the ground as described above, and are suspended and installed on the support work A (see FIGS. 3 and 4). And after that,
The remaining part, that is, the part b ₀ between the two mold blocks b ₁ and b ₄ is moved up to the supporting member A by the same method as in the conventional case, and the mold body is manually composed. The installation is completed, and the installation of the entire form B is completed.

After the formwork B is installed, an appropriate reinforcing bar arrangement (not shown) is performed on the formwork B, and concrete is cast to construct arch concrete C. In this case as well, the concrete is formed. For placing, the formwork blocks b ₁ and b ₄ may be installed, and then the reinforcing frame of that part may be placed into concrete and then the formwork of the hand-assembled part b ₀ may be installed. In this embodiment, the form blocks b ₁ and b ₄ are installed at both ends of the support A. However, the form blocks are not limited to both ends, but may be adjacent to other required parts. Can be installed at intervals and the rest can be done by hand-assembling the formwork.

[0019]

As described above, according to the method of claim 1, the formwork body to be installed in the construction of arch concrete is divided into formwork blocks and is composed on the ground, and this is lifted on the support work, Since the whole formwork is installed by connecting to each other, work at a high place where the foot is slippery and the footing is poor on the arch slope requires only extremely few work such as mounting the formwork. Can be simplified and efficient, and safety can be improved.

Further, since each form block is composed on the ground, the work can be performed easily and efficiently, and the composition work of the next form block can be carried out even while the form block is being lifted or installed. Not only is it possible to construct the formwork in a short period of time as a whole, but it is also possible to construct the formwork block and prepare it during the construction of the arch support and installation. The construction period can be significantly shortened.

Further, in the method of claim 2, as in the case where the arch shape is relatively flat, both ends of the support work are removed,
It is suitable for cases where the work of manually setting the formwork can be done easily and safely, and the work can be done more efficiently than by lifting the crane. Therefore, either the method of claim 1 or the method of claim 2 is selected according to the situation of the construction site, and the construction can be carried out more effectively.

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a mold body is installed according to the present invention.

FIG. 2 is a front view showing a composition state of the mold block on the ground.

FIG. 3 is a front view showing a state in which the form block is lifted and installed.

FIG. 4 is a partially enlarged front view of FIG.

FIG. 5 is a front view showing an installed state of a mold body according to another embodiment of the present invention.

[Explanation of symbols]

A Supporting work B Formwork C Arch concrete a Truss frame structure b _{1 to} b ₄ Formwork block b ₀ Hand-assembled part 1 Leg structure 3 Supporting element 4 Upper chord member 5 Side rod 6 Lower chord member 7 Vertical butter material 8 Horizontal Flapping material 9 Form plate 10 Supporting tool 11 Mounting bolt 12 Assembly stand

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Claims (2)

[Claims] 1. When installing an arch concrete formwork on a supporting structure, formwork blocks of a size obtained by dividing the formwork body into a plurality of pieces are continuously formed to form each of the formwork. A method for installing a form body in construction of arch concrete, characterized in that the frame block is formed on a flat place such as the ground and then lifted and fixed on a supporting structure to form the whole form body. 2. When installing the arch concrete formwork on the support work, a part of the formwork is formed as a form block on a flat surface such as the ground, and this is used for the support work. A method of installing a form body in construction of arch concrete, characterized in that after the structure is hung and fixed, the rest of the formwork is composed on the support work to form the entire formwork body.