JP2673163B2 - 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.
With the inventions of No. 62-78357, etc., we have developed economical and easy-to-construct support for arch concrete formwork. 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 are sub-latches. 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, and further, to the abutment at both lower ends of this arch-shaped supporting frame.
By adopting the method of supporting on the upper part of the pier, not only simplification of material saving construction but also shortening of construction period, improvement of reliability, etc. can be achieved over the whole construction.

[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 construction is performed by sequentially mounting the arch formwork support A by the construction sections divided and set in the width direction of the arch concrete B. In each construction section, the arch concrete B of the same section in the width direction. The side of the horizontal streak 15 placed in After pouring concrete so that it projects, after curing the concrete of each construction section, project from the concrete of each construction section and bond the ends of the horizontal bars 15 to each other, and then pour concrete between the construction sections. It is characterized by that.

〔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 form, horizontal bars 15, 15 and vertical bars (not shown) in the width direction of the arch concrete B are arranged for each section. 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, the side formwork (not shown) is temporarily installed with the end portion projecting for a required length toward the section b adjacent to the horizontal stripes 15, 15 of the section a,
As a result, the width l, which is shorter than the entire width of the section a, becomes the concrete placement width. Then, an external mold (not shown) is connected to the mold body 9 and concrete B ₁ is poured. After the concrete B ₁ is hardened, as shown in FIG. 2, after removing the support body 14 and supporting the support work A on the traveling caster 12,
The height of the traveling caster 12 is lowered to cure the support A, and the formwork 9 is separated from the concrete B ₁ . Then, as shown in FIG. 4, the supporting work A is pushed on the rails via the wheels 13 to move the supporting work A to the position of the adjacent construction section b. Arch concrete B ₁ formed as described above
As shown in FIG. 4, the horizontal streaks 15 and 15 are in a state in which the end portion on the side of the adjacent construction section b projects from the concrete B ₁ .

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 formwork 9 is peeled off from the concrete B _{2 in the same} manner as the previous construction, the support work A is removed, and the training of the concrete B ₂ is waited. Also in this section b, the width of the arch concrete becomes a short width 1 as in the case of the section a.

After curing the concrete B ₂ , the concrete B ₁ and the concrete B ₂ have almost the same shape as shown in FIG. 6, and the horizontal streaks 15 and 15 of the both concretes B ₁ and B ₂ are aligned on the same line. In this case, if the projecting length of the horizontal bars 15, 15 is made sufficiently long, the ends of the horizontal bars 15, 15 will overlap each other as shown in the figure, and between the concrete B ₁ , B ₂ Will form a gap portion d.

Next, the horizontal bars 15, 15 protruding from both concretes B ₁ , B ₂
Settle. In that case, if the horizontal stripes 15 and 15 overlap,
They are directly bound to each other by welding, binding, or the like, and if they do not overlap, they are bound via another reinforcing bar. Then, as shown in FIG. 6, the mold 17 and the like are temporarily installed in the gap portion d and the concrete B _{3 in the} portion d is placed. As a result, the concretes B ₁ , B ₂ and B ₃ are integrally combined, and the entire arch concrete B is constructed as shown in FIGS. 2 and 7.

〔The invention's effect〕

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 end of the main rod, and each support member is supported. By connecting the connecting parts of both side rods of the element with sub-rods, the arch frame support is constructed by attaching the formwork to the arch support which has the whole arch shape and the traveling casters at both lower ends. , The arch concrete is placed on the rails installed along the width direction of the bridge pier, and the construction by the arch form support is performed sequentially for each construction section divided and set in the width direction of the arch concrete. , In each construction section, the concrete is placed so that the end of the horizontal bar arranged in the width direction of the arch concrete of the same section projects toward the adjacent construction section side, and after curing the concrete of each construction section, By mutually binding the ends of the lateral stripes protruding from the concrete construction division, since as to concrete is between its construction division, in which excellent effects as follows.

(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) Since the construction of each construction section is performed after the completion of curing of the concrete of the constructed section and the construction of the next intermediate section is performed, it is possible to prevent misalignment of concrete caused by the difference in construction time, and the arch of the integral shape Can be used for concrete construction.

(4) The entire arch concrete becomes an integrated structure that does not impair the strength due to the horizontal streak over the entire width.

[Brief description of the drawings]

The drawing shows an embodiment of the method of the present invention. Fig. 1 is a front view showing a state where the arch formwork support is set between the piers, and Fig. 2 is a state when the arch formwork support is moved. Fig. 3 is a side sectional view of Fig. 1, Fig. 4 is a side sectional view of Fig. 2, and Fig. 5 shows a state in which arch formwork supports are set in the next construction section. Side cross-sectional view, FIG. 6 is a side cross-sectional view showing the formwork construction in the gap portion, FIG. 7 is a side cross-sectional view showing the entire arch concrete that has been divided, and FIG. 8 is an arch formwork set between the piers. The enlarged front view which shows the principal part of support work. 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 ... Horizontal thread 17 ... Formwork of gap

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, in each construction section, Concrete is placed so that the end of the horizontal bar arranged in the width direction of the arch concrete of the same section projects to the adjacent construction section side, and after curing the concrete of each construction section, the concrete of each construction section Ri and mutually binding the ends of the projecting horizontal stripes, characterized in that concrete is cast between its construction division, movable formwork construction methods arch concrete.