JPH0835328A - Construction of arch concrete - Google Patents

Abstract

PURPOSE:To improve safety and performance of setting work of a formwork body and a reinforcement bar arranged body in constructing arch concrete. CONSTITUTION:Setting of an arch type formwork body D and a reinforcement bar arranged body E are set on a support A set between leg part structures 1, 1 facing against each other is carried out by continuously providing composite blocks B1-B4 in a size of the formwork body D and the reinforcement bar arranged body E divided into a plural number of pieces. The whole of the formwork body D and the reinforcement bar arranged body E is formed and set by hoisting the composite blocks by a crane and fixing them on the support A sequentially after composing each of the composite blocks B1-B4 on the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction method which is used in construction of arch concrete such as an arch bridge so as to efficiently and safely install a form frame and a reinforcing bar.

[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 D on the support A, the bar E of arch concrete C is installed on the formwork D and the concrete is placed.

In order to install the above-mentioned form D, support work A
The vertical flaps 7, 7 curved in an arch shape are arranged at intervals in the depth direction of the supporting structure A, and are fixed to the supporting structure A via a large number of supporting members 10, 10 respectively. A large number of horizontal flap members 8, 8 are arranged on the vertical flap members 7, 7 and a form plate 9 made of a veneer plate or the like is mounted thereon. Further, the reinforcing bar E is installed by carrying up a reinforcing bar or other reinforcing material on the form frame D installed as described above and manually assembling it.

As described above, the conventional installation of the formwork and the bar arrangement is almost manual work and requires a lot of labor and time. Moreover, the installation of the formwork and the bar arrangement is extremely difficult at a high place and on the 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 conventional problems in the installation and assembly of the formwork and the bar arrangement, and the formwork and the bar arrangement block are formed on the ground, and the blocks are used for supporting work. It aims to reduce the amount of manual work on the supporting work and to improve the efficiency and safety of the installation of formwork and bar arrangement.

[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 D and the bar arrangement E of the arch concrete C, the formwork D and the bar arrangement E are to be formed by successively connecting blocks each having a size divided into a plurality of pieces. On the ground, the formwork blocks d _{1 to} d
₄ and the bar arrangement blocks e _{1 to} e ₄ assembled thereon to form a form and bar arrangement composite blocks B _{1 to} B ₄ , which are hung and fixed on the supporting work A, and the form body D and It is characterized in that the entire muscle arrangement body E is formed.

Further, in the construction method of claim 2, in installing the form D and the bar E of arch concrete C on the support A, a part of the form D and the bar E is installed. To
Formed on the ground as formwork / reinforcement composite blocks B ₁ and B _{4 in} which reinforcements are assembled on the formwork, and after suspending and fixing them on the support A, the mold of the remaining part B ₀ It is characterized in that a frame and a reinforcing bar are assembled to form the entire formwork body D and reinforcing bar E.

[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. 5 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 D is installed on the upper surface of the supporting structure A, and the reinforcing frame is laid on the form frame D, 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 D is installed on the upper surface of the supporting work A constructed as described above. This form D is generally a support tool 10, in which a large 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. Then, the bar arrangement E is installed on the form D. Reinforcing bar E is generally arch concrete C
Is formed by arranging an upper end bar 12 and a lower end bar 13 extending in the span direction of and connecting each other with connecting bars 14, 14 and the like.
And the mold plate 9 with spacers 15, 15 interposed between them to form frame D.
Fastened to.

According to the present invention, as shown in FIG. 1, the formwork blocks D and the reinforcing bar E are divided into a plurality of formwork blocks d _{1 to} d _{4 in} the span direction of the support A, for example.
And the formwork by the combination of the bar arrangement blocks e _{1 to} e _4.
Reinforcement composite block (hereinafter referred to as composite block) B ₁ ~ B
₄ are formed, and they are continuously arranged on the support work A.

The above composite blocks B _{1 to} B ₄ are composed on the ground. FIG. 2 shows an example of this. As shown in FIG. 4, assembling bases 16 and 16 having a curved surface whose upper surface follows the arch shape of the formwork block are prepared on the ground. Forming block blocks d ₁ and d ₄ arranged at both ends of the supporting structure A. In this case, the vertical flap material 7,7
Are arranged at intervals so as to be mounted 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 form frame plate 9 is attached. Next, the rebar blocks e ₁ and e ₄ are installed on the formwork blocks d ₁ and d ₄ . That is, as described above, the rebar blocks e ₁ and e ₄ formed by connecting the upper end bar 12 and the lower end bar 13 with the connecting bar 14, 14 are formed on the formwork plate 9 via the spacers 15, 15. And fasten. Incidentally, Haisuji block e _1, e ₄ may be assembled on a mold block d _1, d _4, or, assembled reinforcement block e _1, e ₄ elsewhere, this formwork It may be carried on the blocks d ₁ and d ₄ and fastened.

Next, as shown in FIG. 3, the composite blocks B ₁ and B ₄ whose composition has been finished are lifted by a crane (not shown) and placed on the support A. At that time, between the vertical flap members 7, 7 and the upper chord members 4, 4 of the supporting work A, the height-adjustable supporting members 10, 10 are interposed to form the composite block B.
The height position of ₁ and B ₄ and the degree of curvature are adjusted, the vertical flap material 7 and the upper chord material 4 are connected by the mounting bolts 11 and 11, and the composite blocks B ₁ and B ₄ are fixed and the upper end bars are Reinforcing bar 1 with one end of 12 and bottom bar 13 protruding from leg structure 1
Combine with 7, 17. While the composite blocks B ₁ and B ₄ are being lifted and installed, the composition of the next composite blocks B ₂ and B ₃ is performed on the ground, if possible.

Subsequently, the composite blocks B ₂ and B ₃ having the composition are formed.
Is lifted by a crane, placed on the support A via the support tools 10, 10 and fixed with mounting bolts. The upper bar 12, 12 and the lower bar 13, 13 of each bar arrangement block e _{1 to} e ₄ are connected to each other. To join. As a result, as shown in FIG. 1, the placement of the entire mold frame D and the reinforcing bar E is completed. After that, concrete is placed on the form D to construct arch concrete C. The concrete may be poured into the concrete blocks B _{1 to} B ₄ each time the composite blocks B _{1 to} B ₄ are installed.

In the above-mentioned embodiment, the form B is divided into four in the span direction of the support A to form the bar arrangement blocks b _{1 to} b ₄ , but the number of divisions is the size of the crane. The composite block can be appropriately increased / decreased in consideration of workability, and the composite block can be further divided into blocks in the width direction (depth direction) of the supporting structure A to form blocks. Further, the composition of the composite blocks B _{1 to} B ₄ is
It can be performed without using the mounting base 16.

Next, in the present invention, all of the formwork D and the bar arrangement E to be installed on the support A are lifted and connected to the composite blocks B _{1 to} B ₄ composed on the ground as described above. Rather than constructing the structure, a composite block is installed only in a part of the area, for example, only near the two ends of the sudden arch support on the arch slope, and the other parts are manually assembled on the arch support A similar to the conventional method. It is possible to install the formwork and the bar arrangement by the work.

Explaining the embodiment in this case, as shown in FIG. 6, the form D and the bar arrangement E are divided into a portion near the steep ends of the arch slope on the support A and another portion. division and, at both ends close to the portion, as described above, and the composition of the composite block B _1, B ₄ on the ground, placed in lifting on shoring a (see FIGS. 3 to 5). Then, after that, the other part, that is, the part B ₀ (the hand-assembled part) between the composite blocks B ₁ and B ₂ is carried up on the supporting work A by the related members such as the formwork and the bar arrangement as in the conventional case. After manually constructing and installing the formwork body, the reinforcement is laid on the formwork body, and the installation of the entire formwork body D and the reinforcement body E is completed. After that, arch concrete C is constructed by placing concrete on the form D. Also in this case, the concrete may be placed after placing the composite blocks B ₁ and B ₄ and then placing the concrete in that portion, and then installing the formwork and the bar arrangement of the hand-assembled portion B _0. .

In this embodiment, the composite block is supported by the support A
The composite blocks are installed not only at both ends, but also at other required parts adjacent to each other or at intervals, and the remaining part of the formwork and bar arrangement. It can also be done by hand.

[0019]

As described above, according to the construction method of claim 1, all or a part of the form body and the bar arrangement to be installed in the construction of arch concrete is a composite block in which the form frame and the bar arrangement are combined. Since it was constructed on the ground and the whole of the formwork and bar arrangement was installed by hoisting it on the support work and installing it, complicated work at a high place where it is slippery on the arch slope and the footing is bad Is extremely small, which simplifies and improves work efficiency and improves safety.

Further, since the composite block is formed on the ground, the work can be performed easily and efficiently, and the composition work of the next composite block can be carried out even while the composite block is being lifted or installed, and the formwork as a whole can be formed. Not only will the construction of the body and the bar arrangement be possible in a short period of time, but it is also possible to formulate and prepare a composite block during the construction and construction of the arch support work, and then the whole construction period Will be significantly shortened.

Further, in the construction method of claim 2, as in the case where the arch shape is relatively flat, except for both ends of the support work,
It is suitable for cases where the installation work by hand assembling the formwork and the bar arrangement can be performed 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 and a reinforcing bar are installed by the method of the present invention.

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

FIG. 3 is an enlarged front view of the same.

FIG. 4 is a front view showing how the composite block is lifted and installed.

5 is a partially enlarged front view of FIG.

FIG. 6 is a front view showing an installation state of a mold body and a bar arrangement according to another embodiment of the method of the present invention.

[Explanation of symbols]

A shoring B ₁ .about.B ₄ composite block B ₀ hand-part C arcuate concrete D-type frame E Haisujitai a truss rack structure d ₁ to d ₄ Formwork block e ₁ to e ₁ Haisuji block first leg structure Object 3 Support element 4 Upper chord member 5 Side rod 6 Lower chord member 7 Vertical flap material 8 Horizontal flap material 9 Formwork plate 10 Supporting tool 11 Mounting bolt 12 Upper end bar 13 Lower end bar 14 Connecting bar 15 Spacer 16 Mounting base 17 Reinforcing bar

Claims (2)

[Claims] 1. When installing a formwork and a reinforcing bar of arch concrete on a supporting work, a block having a size obtained by dividing each of the formwork and the reinforcing bar into a plurality of blocks is continuously provided. On the ground, form the above-mentioned form block and the bar arrangement block on it, form a form and reinforcing bar composite block, and hang it on the supporting structure and fix it, and A method for constructing arch concrete, characterized by forming the entire muscular body. 2. A mold in which a part of the mold body and the bar arrangement is assembled on the formwork when the form frame body and the bar arrangement body of arch concrete are installed on the support work. Formed on the ground as a frame and reinforcing bar composite block, hoisting and fixing it on the support work, form the remaining part of the formwork and bar arrangement, and form the entire formwork frame and bar arrangement Arch concrete construction method characterized by the following.