JP2673164B2 - Mobile formwork construction method for arch concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a formwork moving method capable of economically placing arch concrete in an arch bridge or the like.

[Conventional technology]

When constructing a concrete structure such as an arch bridge, a construction surface, particularly a form-supporting facility required for construction of an arch-type concrete spanning between piers (including abutments) becomes a major problem. It is easy if it can be done only by supporting the formwork with a large number of vertical columns like the support work of a horizontal slab, but it is not as easy as a horizontal slab because it has a sloped part in the case of an arch. . Since the concrete load applied to the formwork acts in a direction perpendicular to the formwork surface in any case, the arch concrete on the slope part applies not only vertical load but also horizontal load to the support work. . Since the support pillars are usually erected vertically, the arch support must have a structure that can withstand the horizontal direction. This inevitably results in a truss structure or the like, and the shoring becomes a heavy structure and the construction is complicated. If the arch shape of the arch concrete changes, the supporting work must be manufactured and assembled according to the shape each time, which requires a lot of time and a lot of materials and enormous cost.

In view of such a situation, the present inventor has disclosed Japanese Patent Application Laid-Open No. 62-1906.
No. 62-78357, etc., the development of economical and easy-to-install arch concrete formwork supports has been developed. According to the supporting work of the present invention, a triangular unit supporting element is formed by the main rod and the pair of side rods, and a large number of them are pin-coupled to each other at the ends of the main rod, and at the connecting portions of the both side rods by the sub-rods. With the connected structure, the support of the truss structure that supports the formwork is strong and easy to assemble and disassemble, and the arch shape can be changed simply by changing the length of the auxiliary rod. Therefore, it becomes possible to repeatedly apply it to the construction of arch concrete of various sizes and arch shapes,
Furthermore, by adopting a method in which both lower ends of this arch-shaped support frame are supported on the abutment and the upper part of the pier, not only simplification of material saving work but also shortening of work period, improvement of reliability, etc. Over the course of a major improvement.

[Problems to be solved by the invention]

However, the cost of supporting the formwork in the construction of arch concrete is still quite high. In particular, for example, when only one span is constructed, since there is no repeated use of the form support, the construction unit cost of the arch concrete is significantly increased.

The present invention has been made to solve the problems in the construction of such arch concrete, and uses the movable formwork support for arch concrete construction developed by the present inventor to make arch concrete its width direction ( Transverse direction)
The construction work is divided into two parts, and in particular, the problem of connecting the concrete, which is a problem in the construction work, is solved by connecting the concrete to each other, and the cost of arch form support is greatly reduced. It is intended to provide a construction method capable of efficiently and reliably performing the construction of.

[Means for solving the problem]

Regarding the configuration of the present invention to achieve the above object,
Referring to the drawings corresponding to the embodiments, in the present invention, the main rod 5 and a pair of side rods 6 and 6 are connected to each other to form a triangular supporting element 4, and a large number of them are connected to each other. The end portions of the support elements 4 are connected by pins 7 and the connecting portions of the two side rods 6, 6 of each supporting element 4 are connected by the auxiliary rods 8, 8 so that the formwork 9 is attached to the supporter 10 having an arc shape as a whole. On the rails 3 and 3 installed along the width direction of the bridge piers 1 and 1 on which the arch concrete B is installed, the arch form support A constructed by mounting the traveling casters 12 and 12 on the lower ends of both ends is attached. The work is carried on and the construction by the arch-shaped frame support work A is sequentially performed for each construction section divided and set in the width direction of the arch concrete B, and each construction section extends in the width direction of the arch concrete B. Tensile steel materials 15, 15 with hollow tubes 16, 16 for insertion After the curing of the concrete cast into each construction section is completed, the hollow pipes 16 and 16 of each construction section are connected to each other, and the tension steel materials 15 and 15 are penetrated to tighten them, and the concrete of each construction section is tightly bonded together. It is characterized by doing.

〔Example〕

In the figure, reference numerals 1 and 1 denote bridge piers constructed in parallel at required intervals, and brackets 2 and 2 are mounted at predetermined heights on opposite side surfaces of the piers 1 and 1 via embedding bolts.
On the brackets 2 and 2, a horizontal rail 3 is erected along the side surface of each pier 1, that is, along the transverse direction of the arch concrete B. Then, between the piers 1, 1, the arched form support A is mounted on the rails 3, 3 and assembled.

This arched form support A is already known from Japanese Patent Application Laid-Open No. 63-78357. That is, a large number of supporting elements 4 which are framed in a triangle by the main rod 5 and the side rods 6 and 6 are connected to each other by the pins 7 at the ends of the main rods 5 and 5, and between the connecting tops of the side rods 6 and Are connected to each other by a sub-rod 8 shorter than the main rod 5, an arch support 10 is formed as shown in the figure, and an arch-shaped frame 9 is erected on the upper surface thereof, and its depth ( The length of the arch concrete B in the transverse direction) is approximately a fraction of the width L (see FIGS. 3 to 7) of the arch concrete B to be constructed.

At the lower end of the arch support structure 10, supporting legs 11, 11 are provided at the lower end of the main rod 5, and the supporting leg 11 is
As shown by the arrow in FIG. 8, a traveling caster 12 is mounted which can be adjusted in height and sideways.

The arched form support A constructed as described above is mounted on the piers 1, 1 on the rails 3, 3 mounted on the piers 1, 1
The support body is mounted via the rails 3 and 13 and can be moved to a predetermined position by traveling on the rails 3 and 3. In a predetermined construction position, the support body is detachably attached to the bracket 2. The lower ends of the supporting legs 11 and 11 are locked to the and support the arched form support A.

In this embodiment, since the arch concrete B is constructed by performing the construction in approximately two minutes in the width direction, the depth of the arch-shaped form support 10 is approximately two-half the width of the arch concrete B. Although it is assumed to be 1, it is also possible to divide the arch concrete B into three or four parts, in which case the depth of the arched form support 10 should be shortened according to the number of divisions. Can be.

In the construction of arch concrete according to the embodiment,
As shown in Fig. 7, the total width L of arch concrete B is 2
The divided construction divisions a and b are set, and formwork construction is performed for each of the divisions a and b.

Therefore, prior to setting the formwork, reinforcement (not shown) is performed for each section, and at that time, a hollow pipe 16 extending in the width direction of the arch concrete B for inserting the tension steel material 15,
16 is installed. Then, first, as shown in FIG. 3, the arch-shaped frame support A is positioned corresponding to one construction section a, and the height and lateral movement of the traveling caster 12 are adjusted to adjust the shape of the frame 9. After setting the position, the support leg 11 is supported and fixed to the support body 14. At that time, although not shown, it is needless to say that the outer mold and the side mold are temporarily provided. Then, concrete B ₁ is poured.

After the cast concrete B ₁ is hardened, as shown in FIG. 2, the support 14 is removed to support the support work A on the traveling castor 12, and then the height of the traveling caster 12 is lowered. Then, the supporting work A is cured, and the formwork 9 is peeled off from the concrete B ₁ . Next, as shown in FIG. 4, the supporting work A is pushed and run on the rail 3 via the wheels 13 and 13, and the supporting work A is moved to the adjacent construction section b.
Move to the position.

As shown in FIG. 5, the moved support shovel A again positions the form frame body 9 as described above to fix the shovel support A. In the meantime, the concrete B _{1 that} has been poured earlier is cured and the arch shape is reduced in the height direction, and as shown in the figure, the concrete B ₁ is in a state where the concrete B ₁ has dropped down from the beginning of the concrete pouring. Temporary provision of side molds and the like in this construction section b is performed in the same manner as in the case of the above. And concrete B ₂ of the same section b
After casting, the form body 9 is peeled off from the concrete B _{2 in the same} manner as the previous construction, and the support A is removed (see FIG. 6). As the curing of the concrete B ₂ progresses, this concrete B ₂ will also shrink to the same shape as the concrete B ₁ previously constructed, and both concrete B ₁ and B ₂ will have their end faces matched and joined to each other, and the arch concrete B Will be formed in its entirety. Thereby, both concretes B ₁ , B ₂
Hollow tubes 16, 16 arranged inside are in contact with each other by contacting their end faces. Then, as shown in FIG. 7, the communicating hollow tubes 16 and 16 are penetrated by the tension steel materials 15 and 15 formed to be longer than the full width of the arch concrete B and projected from both sides of the arch concrete B. Nuts 17, 17 are screwed to the ends of the tensioned steel materials 15, 15 that are being tightened, and prestress is introduced into the tensioned steel materials so that both concretes B ₁ , B ₂
Is tightly tied in the width direction. As a result, the entire arch concrete B in which the concretes B ₁ and B ₂ are integrally joined by the divided construction is constructed.

[Effects of the Invention] As described above, in the construction method of the present invention, the main rod and the pair of side rods are connected to each other to form a triangular support element, and a large number of them are pin-connected to each other at the ends of the main rod. In addition, the connecting parts of both side rods of each supporting element are connected by a sub-bar, and the formwork is attached to the supporting work which is arched in its entirety, and the traveling casters are attached to the lower ends of both ends. Formwork supports are placed on rails installed along the width direction of the bridge piers that make up the arch concrete, and the construction by the arch formwork supports is divided into the width direction of the arch concrete In each construction section, a hollow tube for tension steel material insertion that extends in the width direction of arch concrete is arranged, and after the curing of the concrete cast into each construction section is completed, Open tube Since the tensioned steel material is penetrated and tensioned so that the concrete of each construction section is tightly bonded together, the following excellent effects are exhibited.

(1) Since arch concrete is constructed for each construction section divided into multiple sections in the width direction, arch-shaped form supports used for this purpose need only be a fraction of the depth. As a result, the cost of supporting the formwork can be greatly reduced, and the construction cost can be saved.

(2) The arch formwork support structure has a structure in which triangular support elements are connected by pins, and is movable between the rails of the bridge piers on which the arch concrete is framed.
The strength is large and simple, and the division work for each section can be performed efficiently.

(3) As the entire arch concrete, the tension steel material over the entire width of the arch concrete provides an integrated structure that does not impair the strength.

[Brief description of the drawings]

The drawings show an embodiment of the construction method of the present invention. FIG. 1 is a front view showing a state in which arch formwork supports are set between bridge piers, and FIG. 2 is a view showing movement of arch formwork supports. The front view showing the state, FIG. 3 is a side sectional view of FIG. 1, FIG. 4 is a side sectional view of FIG. 2, and FIG. 5 is a state in which an arch form support is set in the next construction section. Fig. 6 is a side sectional view showing the state in which the same concrete is poured and the arch formwork support is removed, and Fig. 7 is a side sectional view showing the whole of the divided arch concrete. Fig. 8 is an enlarged front view showing the main part of the arch formwork support work set between the piers. A: Arch formwork support B ... Arch concrete 1 ... Bridge pier, 2 ... Bracket 3 ... Rail, 4 ... Supporting element 9 ... Formwork, 10 ... Arch support 12 ... Running Castor, 15 …… Tensioned steel 16 …… Hollow tube

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A main rod and a pair of side rods are connected to each other to form a triangular supporting element, and a large number of them are pin-connected to each other at an end of the main rod, and a connecting portion of both side rods of each supporting element. A bridge pier with arch concrete is used to connect arches to the arched concrete frame support, which is constructed by connecting the connecting rods with auxiliary rods and attaching the formwork to the arched supportwork on the whole, and attaching traveling casters to both lower ends. Placed on a rail erected along the width direction of, the construction by the arch form support is carried out sequentially for each construction section divided and set in the width direction of arch concrete, each construction section, Hollow pipes for inserting tensile steel materials that extend in the width direction of arch concrete are arranged respectively, and after curing of the concrete placed in each construction section is completed, the hollow tubes of each construction section are connected to penetrate the tension steel material. And tense, each construction area Characterized by Tightened the concrete integrally, movable formwork construction methods arch concrete.