JPH0364002B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a formwork moving construction method that can continuously place arch concrete for arch bridges and the like.

[Conventional technology]

Recently, in bridge structures such as roads and railways, deterioration of concrete slabs constructed on bridge piers,
Damage is becoming a major problem. Deterioration and damage to concrete slabs is due to the material properties of concrete that are strong in compression but weak in tension.Dry shrinkage and repeated moving concentrated loads cause cracks, and water that enters through these cracks causes rusting and expansion of reinforcing bars. It is thought that this will accelerate the concrete flaking and the deterioration of the reinforced concrete will progress.

Therefore, in order to deal with this kind of deterioration of concrete, bridge types that match the characteristics of concrete have been studied, and concrete arch bridges, which have been forgotten today, have been attracting attention. This arch bridge is an excellent structural type for a concrete structure because it becomes a compressed member throughout its cross section when a dead load is applied.This type of bridge prevents deterioration of the concrete and greatly improves durability. That is true.

However, when constructing a concrete structure such as an arch bridge, a major problem arises in terms of its construction, especially the formwork facilities required to construct the arch-shaped concrete between the piers. As a general example of this construction, each pier is first constructed to the required height, then arch-shaped formwork is erected between the piers and concrete is poured. If it could be supported by vertical supports, construction would be easy and economical, but in actual construction, the arch formwork and the outer formwork set opposite to it, The concrete poured between the two forms will be piled up sequentially from the bottom of both forms, so at the initial stage of concrete pouring,
The load on the concrete formwork acts perpendicular to the formwork surface. On the other hand, the pillars that support the formwork part can support the formwork in the vertical direction, but it is almost impossible to support them in the horizontal direction, because the angle of intersection with the arch support butterfly of the formwork deviates greatly from the right angle direction. . Therefore, the arch support butter needs to have a structure that can withstand horizontal loads by providing horizontal members. This necessarily results in a truss structure.

Therefore, in actual arch concrete construction, a truss-structured arch support is supported by a number of pillars erected on the ground, and formwork is attached to the support.

[Problem that the invention seeks to solve]

When attempting to construct arch concrete between each pier using such conventional construction methods, the formwork and shoring must be assembled and dismantled in sequence for each construction section between each pier and for each pier. As the construction progresses, the work becomes extremely complicated, requires a lot of labor and deadlines, and costs a large amount of money.

The present invention was made in order to solve the problems of the conventional construction method as described above, and it improves the shoring of the arch formwork, makes the arch formwork device movable, and provides space between each pier. A rail for moving the formwork equipment is erected, and a moving trolley is placed on the rail.
Formwork equipment that has completed construction can be moved to the construction position between the next piers without dismantling, allowing construction to continue, greatly reducing labor and efficiency in formwork construction, and significantly reducing costs. The purpose of this project is to provide a formwork method for concrete arches.

[Means for solving problems]

The structure of the present invention will be described with reference to the drawings. The present invention combines a main rod 11 and a pair of side rods 12 to form a triangular supporting element 15, and a large number of them are connected to each other to support the main rod 11. The end portions are connected by pins 13, and the connecting portions of both side rods 12, 12 of each support element 15 are connected by sub-rods 17, so that an arch-shaped form body B is attached to a support A having an arch shape as a whole. Attachment and attaching traveling casters 24 to both ends of the shoring A to configure a mobile formwork device E,
Rails 3, 3 are installed on each pier 1, 1 along the width direction of the viaduct, and rails 5, 5 are installed on the outside of each pier 1, 1 along the length direction of the viaduct,
The movable formwork device E is placed on the rails 3, 3 in the width direction so that the arch concrete C can be placed, and after the concrete has hardened, the movable formwork device E is run to form the concrete in the length direction. It is mounted on a height-adjustable trolley D that is movably placed on rails 5, 5, and as the trolley D runs, the movable formwork device E is moved to the next pier 1,
After being transferred between the piers 1 and 1, the movable formwork device E is placed on rails 3 and 3 in the width direction and inserted into the piers 1 and 1.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1, 1 are piers constructed in parallel at required intervals, and brackets 2, 2 are attached to the opposing sides of each pier 1, 1 at a predetermined height via embedded bolts. On these brackets 2, 2, there are rails 3 running horizontally along the sides of each pier 1.
will be erected. In addition, a pedestal 6 is provided on the outside of each pier 1, 1, for example, close to the front side, through supports such as columns 4, 4, and is long in the direction in which each pier 1, 1 is connected. Two rails 5, 5 are constructed along the length of the pier.

Then, between the initially constructed piers 1 and 1, an arch-shaped formwork device E is assembled by being mounted on rails 3 and 3.

This formwork device E is composed of an arch support A and an arch-shaped form body B installed thereon.

The arch support A has side rods 1 at both ends of the main rod 11.
2 and 12 are pivotally connected by pins 46 (see FIG. 5), and the other ends are connected to the coupling plate 14.
A large number of support elements 15 are connected to each other via pins 13 at the ends of the main rods 11, 11, and each support element 15,
The connecting plates 14, 14 at the top of each of the 15 are connected to each other by a sub-rod 17 shorter than the main rod 11 to form a pair of left and right half-arch frame structures, as shown in FIG.
a ₁ and a ₂ respectively, and the main rods 11 and 11 at the inner ends of both half-arch frames a ₁ and a ₂ are connected to pins 18
Furthermore, a tension rod 20 having a tension adjustment device 19 such as a turnbuckle is tensioned between the connecting plates 14, 14 at each outer end, thereby forming an arch structure made of the entire truss assembly. At both ends of this arch structure, support leg rods 2 are provided with support balls 22 at the lower ends of the main rods 11.
1 is attached, and its tip and the coupling plate 14 at the outer end are connected by an auxiliary rod 23, and the supporting leg rod 21 is provided with a traveling leg wheel 24 whose height and lateral movement can be adjusted. It is attached via a bracket 21a.

A plurality of arch supports A configured in this manner are arranged in a plurality of rows at required intervals in the depth direction of the arch concrete to be constructed, and each support A is integrally connected by a connecting rod or the like as appropriate. In addition, in this case, the traveling caster 24 does not need to be provided for each support A.

The traveling caster 24 has a structure in which wheels 27 are attached via a lateral movement adjustment mechanism 26 to a leg body 25 having a height adjustment mechanism using hydraulic pressure or the like.
The arch support A is mounted on a rail 3 installed on a bracket 2 attached along the depth direction of the opposite side surface of the leg structure 1 via the wheels 27 of a traveling caster 24, It is designed to be able to move into position by running on top of it, and
At a predetermined construction position, the arch support A is supported by engaging the support ball 22 of the support leg rod 21 with the support body 30 detachably attached to the bracket 2.

The arch-shaped form body B is formed by arranging a large number of vertical butterflies 31 and horizontal butterflies 32 in an arch shape, and attaching a weir plate 33 to the outside thereof. To attach it to the arch support A, place a pair of upper and lower wedge plates 34 on the outer surface of the main rod 11 of each support element 15.
Connect the horizontal butterfly 32 to this, and bolt-nut 35
This is done by fixing the form body B at a suitable position to the main rod 11 by means of methods such as the following. In addition, tightening bolts 36 are provided at both ends of the form body B between these and the main rod 11, so that both ends of the form body B can be drawn largely toward the main rod 11. It is set as.

In the formwork apparatus E, the arch support A is formed by connecting a large number of supporting elements 15 arranged in a triangular configuration and forming a predetermined arch shape by means of sub-rods 17, and half-arch frame structures a ₁ , a ₂ are connected by pins 18, and there is a major reason why the sub-rod 17 is not interposed between the connected supporting elements 15, 15. That is, since the support elements 15 are connected as unitary members, the length of the arch can be freely increased or decreased depending on the number of connections, and the degree of curvature of the arch can also be freely determined simply by selecting the length of the sub-rod 17. will be possible. In addition, half-arch frame structures a ₁ , a ₂
are connected only with pins 18, and both ends of arch support A are supported by support balls 22, so that a tensile force is always applied to each sub-rod 17 of arch support A, making the structural calculation reliable. In addition to this, it is possible to eliminate the overall looseness that occurs because each member is connected by a pin connection.

In addition, the rails 5 installed on the outside of the piers 1, 1,
A pair of traveling carts D and D are placed on the top of the vehicle.
This running bogie D has a rail 41 parallel to the rail 3 of the pier 1 laid on a pedestal 40 which is formed long in the transverse direction of the rails 5, 5, and a pedestal 4
Running legs 43, 43 with wheels 42 at their lower ends that can be freely adjusted up and down are attached to the four locations of 0.
It is designed to be able to move on the rails 5, 5 via the running legs 43, and the position of the pedestal 40 can be adjusted up and down by raising and lowering the running legs 43.

The formwork construction of the arch concrete according to this embodiment uses the above-mentioned formwork device E, installs rails 3, 3 and 5, 5 for moving the formwork device E, and moves the formwork device E between the next piers. It is carried out using a traveling trolley for transportation.

First, the formwork device E is assembled between the opposing piers 1 and 1 as shown in the figure. In this case, in order to facilitate mutual movement between the piers, it is a good idea not to increase the length of each formwork device E in the depth direction. Therefore, the width (depth) of the arch concrete C If the size is large, one formwork device E may be used to repeat the construction in the depth direction, or, as illustrated in FIGS. 3 and 4, several formwork devices E, E may be connected to perform construction at one time.

The vertical positioning of the formwork device E assembled between the piers 1 and 1 is performed by adjusting the height of the legs 25 of the traveling platform vehicle 24, and the lateral positioning is performed by adjusting the lateral movement adjustment mechanism 26. It is done by. Further, fine adjustment to match the curvature of the arch concrete C can be performed by adjusting the thickness of the wedge plate 34. Once the formwork equipment has been positioned,
The support ball 22 at the lower end is supported by the support 30, and the outer formwork (not shown) is connected to the arch concrete formwork B by connecting bodies 45, 45..., and concrete C is poured. 1st
(see Figure, Figure 3).

After the concrete C has hardened, as shown in FIG. is tightened to draw the end of the arch form B toward the main rod 11, and separate it from the concrete C. Then, after removing the support body 30 and supporting the device on the traveling caster 24,
By lowering the height of the legs 25, the entire form body B is lowered and separated from the concrete C.

Once the formwork has been peeled off, as shown in FIGS. 2 and 3, align the rails 41 of the traveling carts D and D with the rails 3, and remove the traveling legs 43 and 43.
The height of the rail 41 is fixed to match the rail 3 by adjusting the elevation of
Move it up and fix it. Then, the traveling truck D is pushed forward to move the formwork device E between the piers 1 and 1 where the next arch concrete will be constructed, and the rail 41 of the traveling truck D is moved to the rail 3 built on the next piers 1 and 1. At the same time, the formwork device E is inserted between the piers 1 and 1. Subsequently, another formwork device E located at the back is similarly moved and inserted between the new piers 1 and 1. Thereafter, the work is repeated in the same manner, and the arch concrete C, C between each pier 1, 1... is successively constructed.

In addition, when moving the formwork device, by tightening the tension rods 20 of arch support A, arch support A can be prevented from wobbling and sagging, and the movement can be performed smoothly and safely. can.

Further, the configurations of the formwork device E, the traveling trolley D, or the construction of the rails 3, 3, 5, 5, etc. in the present invention are not limited to those of the above embodiments, and the design may be changed as appropriate. be able to.

〔Effect of the invention〕

As explained above, in the construction method of the present invention, rails are erected on opposite sides of each pier on which arch concrete is to be constructed, and a formwork is placed on the arch support structure, which connects a large number of support elements arranged in a triangular shape, on the rails. In addition to attaching the arch body, a formwork device equipped with a traveling pedestal that can be adjusted vertically and laterally is used to set the formwork by placing it on the rails of the pier, and after pouring and curing the arch concrete, The formwork equipment is moved on the rails installed in the width direction of each bridge pier, and is moved and placed on a traveling trolley that can be raised and lowered and placed on the rails installed in the length direction of the viaduct. By moving and inserting the structure between the piers to be constructed and repeating this process, the arch formwork device does not need to be assembled and disassembled for each section as in conventional construction methods, and the arch formwork device can be moved and inserted between the piers to be constructed. The formwork equipment can be moved and used repeatedly as it is, and formwork construction, which is complex and requires a lot of labor and materials, is significantly simplified, and construction costs can be greatly reduced, among other excellent effects. It is something that can be demonstrated.

[Brief explanation of drawings]

The drawings show an embodiment of the construction method of the present invention. Fig. 1 is a schematic front view showing the formwork device set between the piers, and Fig. 2 is a schematic front view showing the state in which the formwork is peeled off and the formwork device is placed on a traveling trolley. Fig. 3 is a schematic side view of the state shown in Fig. 1, Fig. 4 is a schematic side view of the state shown in Fig. 2, and Fig. 5 shows the formwork device set between the piers. FIG. 6 is an enlarged front view showing the main parts of the mold, and FIG. 6 is a front view showing the same mold after being peeled off. A...Arch shoring, B...Archid formwork body, C...
Concrete, D... Traveling trolley, E... Formwork device, 1
... Pier, 3,5...Rail, 11...Main rod, 12...Side rod, 13...Pin, 15...Supporting element, 17...Secondary rod,
18... Pin, 20... Tension rod, 21... Support leg rod, 2
4... Traveling caster, 25... Leg body, 27... Wheel, 40...
Frame, 41...rail, 42...wheel, 43...travel leg.

Claims (1)

[Claims] 1 A main rod and a pair of side rods are combined to form a triangular support element, and a large number of them are connected to each other by pins at the ends of the main rod, and a secondary support element is connected between the connecting parts of both side rods in each support element. Connected by rods,
A movable formwork device is constructed by attaching an arch-shaped formwork body to a shoring structure whose entire structure is arch-shaped, and at the same time attaching traveling gantry wheels that can be moved vertically and laterally to both ends of the shoring structure. Rails are installed along the width direction of the viaduct on opposing sides, and rails are installed outside of each pier along the length direction of the viaduct, and a movable formwork device is placed on the rails in the width direction. After the concrete has hardened, the movable formwork device is moved and placed on a height-adjustable trolley that is movable on longitudinal rails. An arch in a viaduct, etc., characterized in that the movable formwork device is transferred between the next piers by traveling, and then placed on a widthwise rail installed between the same piers and inserted between the piers. Concrete formwork mobile construction method.