JPS6322967A - Mold frame timbering construction method for executing arch concrete - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to support for formwork applied to the construction of 7-ch concrete in 7-ch bridges, etc.

[Prior Art] 6. Recently, in bridge structures such as roads and railways, deterioration and damage of concrete slabs constructed on bridge piers have become a major problem. Deterioration and damage to concrete slabs occur due to the material characteristics of concrete, which is strong in compression and weak in tension.Dry shrinkage and repeated moving concentrated loads cause cracks, and water that enters through these cracks promotes rusting and expansion of reinforcing bars. It is expected that the concrete will flake off and the reinforced concrete will deteriorate further.

So, to deal with this kind of concrete deterioration, 1i! which matches the characteristics of concrete! ! The I-beam type was revised, and concrete arch bridges, which have been forgotten today, have been attracting attention.

This type of bridge becomes a compressed member in its entire cross section when a dead load is applied, making it an excellent structural type for a concrete structure.This type of bridge prevents concrete from deteriorating and has great durability. "Toward" - to do is to be done.

However, it is concrete like an arch bridge)? When constructing the M Relic, a major problem is the 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, there is a gap between the arched formwork and the outer formwork set opposite it. Since the concrete to be placed will be piled up sequentially from the bottom of both formworks, at the initial stage of pouring concrete, the load on the concrete formwork will be on the formwork surface. Acts at right angles. 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 in which horizontal members are provided to withstand horizontal loads. This necessarily results in a truss structure.

Therefore, during arch concrete construction, an arch support with a truss structure is supported by a large number of pillars erected on the ground, and formwork is attached to the support. However, shoring using such construction is a heavy structure and requires large-scale construction. Moreover, not only do the formwork and its shoring have to be repeatedly assembled and dismantled for each unit construction section, but if the arch shape of the arch concrete changes, the shoring must be adjusted each time to match the arch shape. The new shape and structure will be made and assembled. Therefore, the assembly and disassembly work performed for each construction section between each pier is extremely complicated.
Not only does it take a lot of time, but it also wastes a lot of materials and costs a huge amount of money.

The inventor of the present invention, in view of the actual situation, has filed a patent application filed in 1986-13.
No. 9297 and other inventions have led to the development of economical and easy-to-implement arch concrete formwork supports. In the shoring of this invention, a triangular unit support element is formed by a main rod and one side rod, and a large number of them are connected to each other with pins at the ends of the main rod, and are connected to each other at the joints of both side rods. The structure is connected by a sub-rod, and the shoring with a truss structure that supports the formwork is strong and easy to assemble and dismantle. The shape can be changed, so it can be repeatedly applied to the construction of arch concrete of various sizes and arch shapes, reducing the amount of material used,
Significant improvements can be made in all areas of construction, including simplified construction.

[Problem that the invention seeks to solve]

By the way, in the case of temporary structures such as shoring, it is economically important to use standardized members that can be used for other purposes.

The shoring according to the invention is also designed to be widely applicable to large and small concrete arches with different spans by combining unit supporting elements of the same configuration. However, when it comes to constructing shoring with a span that is much better than the design standard, the strength of the existing unit shoring elements becomes insufficient. Therefore, even in the shoring of the invention, there is a natural limit to the extent to which it can be adapted to the size of the span length.

The present invention was made for the purpose of greatly expanding the scope of application of the shoring system in which the above-mentioned unit support elements are combined. By focusing on the fact that compressive stress (compressive stress) is applied, and by creating a VJ structure that can double the strength of the main rod, we have developed a structure that is highly adaptable for arch concrete construction using unit supporting elements. The aim is to provide formwork support.

[Means for solving problems]

The structure of the present invention will be explained with reference to FIGS. 1 and 2 corresponding to embodiments.
A large number of support elements 15 formed into a triangle by combining the
They are connected to each other by a pin connection 17 at the end of each main rod 11, and at both side rods 12.
The 12 connecting parts are connected to each other by the sub-rods 18 to form an arch-shaped frame, and reinforcing main rods 22 are arranged outside the main rods 11 of each supporting element 15, so that the main rods 11 are connected to each other. Connecting pin 1
The reinforcing main rods 22 are connected 23 to each other at the other end of the connecting rod 21, one end of which is pivotally connected to the reinforcing rod 7.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

In the figure, 1.1 is the leg structure constructed at a predetermined interval before placing the arch concrete 8, 2 is the arch formwork constructed between the leg structures, and 10 is the arch. It is an arch-shaped shoring that supports the formwork, and the arch-shaped formwork 2 is made of butter material 3 formed in an arch shape.
It is formed by arranging a large number of weirs in parallel and connecting them appropriately with horizontal bata members (not shown), and by installing 11 weir plates 4 on the outside of the bata village 3.

The 7-inch type shoring 10 has side bars 12 at both ends of the main bar 11.
．． One end of each of 12 is tied 13, 13, and the other end is tied 16, 16 to each other via a coupling plate 14 to form a triangular supporting element 15, which is used as a unit member. , a large number of them are connected to each other by pins 17 at the ends of the main rods 11.11, and the connecting plates 14.14 of each support element 15 are connected to each other by auxiliary rods 18 shorter than the main rods 11, so that the entire structure is arched. Form into a shaped structure. The sub-rod IS may be attached by pin-coupling to the coupling plate 14, but as shown in FIG. It may be fixed by welding. The size of the blue-white area formed on this arch support 10 is determined by the length of the sub-rod 18.
This will happen. Therefore, in the arch support 10, by changing only the length of the sub-rod 18, its paleness can be freely changed, and its curvature can also be freely increased or decreased in units of 15 for each support element. This means that it can also be used to construct arch formwork with complicated curves.

Further, the -i portion of a continuous rod 21.21 having a required length is pivotally connected to the connecting point of the main rod 11.11 of each supporting element 15 via a pin 17. Reinforcement main rods 22.22 formed in the same manner as the main rod 11 are arranged outside each main rod 11. 1
It is connected to the other end of the connecting rod 21.21 which is pivotally connected to the connecting pin 17.17 of No. 1 by means of a pin 23.23. As a result, the three adjacent reinforcing main rods 22, 22 and the connecting rod 21 are connected to the pin 2.
3, they are mutually connected.

In the illustrated example, the reinforcing main rod 22 is of the same length as the main rod 11, so there may be some misalignment between the main rod 11 and the reinforcing main rod 22 in the length direction. It turns out, but
As shown in the figure, the inclination of the connecting rods 21, 21 makes the deviation to a level that does not cause any practical problems. In addition, the reinforced main rod 22
It is also possible to make a part or all of the main rod 11 slightly larger than the main rod 11.

In Figure 1, the top two reinforcing main rods are larger than the others. Since using as many standardized parts as possible increases economic efficiency, use the same material as the main rod for the reinforcing main rod, and reduce the number of non-standard materials used as much as possible. This is desirable.

Screw rods 27 and 27 are attached to the reinforcing main rods 22 of each supporting element 15 by penetrating through the reinforcing main rods 22, and a pair of nuts 2 are screwed into the screw rods 27 with the reinforcing main rods 22 in between.
It is fixed by tightening 8.28,
By adjusting the screwing relationship position with this nut 28, the length of the upward protrusion of the reinforcing main rod 22 can be adjusted. The outer end of the threaded rod 27 is connected to the butter material 3 of the formwork 2.
and can be freely tied together with pin 7.

+i1f Construction Structure--The shoring 10 consists of the main rods 11.1 of the supporting elements 15.15 at both ends, as shown in FIG.
1 and the reinforced main rod 22.The terminal part of 22 is fixed to the pier 1, (platen) 2. The frame is fixed to L24 with pins 25 and 25. The arch supports 10 are installed in a plurality of rows at required intervals in the depth direction of the arch concrete to be constructed, and each of these supports is connected to the connecting plate 14, the side rods 12 or the main rods 11, and reinforcement. The parts of the main rod 22 are connected to each other by a connecting rod 26 (see FIG. 2). Note that connections at the side rods 12, main rods 11, and reinforcing main rods 22 are not shown.

The formwork 2 is constructed on a grooved arch support. That is, the buffing material 3 is placed on the outside of the reinforcing main rods 22, 22 of the arch support, and the pins 7 are inserted into the pin holes of the buffing material 3 prepared in advance and the pin holes at the ends of the Neno rods 27.
The reinforcing main rod 221 is fixed via this rod 27, and the weir plate 4 is attached to the outer surface of the buffing material 3. At this time, the position and arc of the formwork can be adjusted as appropriate by adjusting the protruding length of the narrow rod that extends over the main rod 22.

After the formwork 2 is erected, the auxiliary formwork 6 is installed between the '4i part of the formwork 2 and the pier 1, the outer formwork 5 is erected, and concrete 8 is poured between both formworks 2.5. Set up After the concrete 8 has hardened, remove the outer formwork 5 and the auxiliary formwork 6, then loosen one force of )28 and tighten the other to shorten the protruding length of the rod 27. The formwork 2 is pulled toward the reinforcing main rod 22 by one inch through the material 3, and as a result, the formwork 2 is separated from the concrete 8 as shown in the third V.

After the construction of the arch concrete 8 is completed, the formwork 2 and the shoring 10 are normally dismantled and removed.
is not fixed to the pier 1, and a long rail is laid in the depth direction of the bridge Pij 11, and the main pier 11
If a moving heavy wheel is attached to the bottom of the end of the arch support structure 1o to move it along the rail, the frame 71, 11 can be separated from the concrete 8 as shown in Figure 3. It can be moved to the next construction site without dismantling it.

ffi Figure 4 shows an example of a pond in which the shape of the connecting rod 21 connecting the main rod 11 and the reinforcing main rod 22 is changed. Normally, it is preferable to use the same reinforcement rod 22 as the main rod 11, but in such a case, the degree of curvature of the arch shape is too large, or the arch span is large and the supporting element 15 is
As the number of connected rods increases, the misalignment between the main rod 11 and the reinforcing main rod 22 becomes large, and it may not be possible to maintain the structure by tilting the connecting rods 21 alone. In such a case, as shown in FIG. 4, the connecting rods 21' connected at the top are formed into a substantially triangular shape, and the ends of the reinforcing main rods 22 and 22 connected at the rrt section are spaced apart from each other. If the main rod 11 and the reinforcing main rod 22 are connected to each other by pins 23' and 23', any major conflict between the main rod 11 and the reinforcing main rod 22 will be eliminated. In addition, this triangular link 2 is also used for the pond link 21.
1′ can be applied.

〔Effect of the invention〕

As explained above, according to the present invention, a main rod and a pair of side rods form a unit support element, a large number of which are connected to each other with pins at the ends of the main rod, and the connecting rods on both sides are connected. The sections are connected to each other by sub-rods at -1 to form an arch shoring, and reinforcing main rods are arranged parallel to the main rods on the outside of the main rods of each supporting element in the arch shoring. Since the reinforcing main rods are connected to each other in a link-like manner by connecting rods, the shoring with the truss-in structure that supports the formwork can be made strong and easy to assemble and dismantle. The shape of the arch can be changed just by changing the length of the secondary rod, and therefore it can be applied repeatedly to arch concrete of various sizes. , it is possible to save materials and labor. Also,
In addition to the main rod, which receives most of the stress, a reinforcing main rod is connected via a connecting rod, so the main rod and the reinforcing main rod are evenly opposed, and the strength is doubled. Become.

Therefore, it becomes possible to use the supporting elements applied to the construction of small arch spans in the construction of large arch spans, and the range of application of arch shoring is greatly expanded. Arch shoring can be constructed by reusing and combining almost the same parts for various sizes, so the economic efficiency of arch shoring increases significantly, and construction costs can be reduced significantly. It has many excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a construction mode using a shoring according to an embodiment of the present invention, Fig. 2 is an enlarged side view showing a part of the same shoring, and Fig. fjS3 shows the formwork in Fig. 1. FIG. 4 is a side sectional view showing the separated state, and FIG. 4 is a side view of the main part showing the embodiment of the pond. 1... Pier 2... Arch formwork 5...
Outer formwork 8... Concrete 10... Arch support 11... Main rod 12... Side rod 15
...Unit support element 17...Pin 18...
・Sub-rod 21...Continuous rod 22...Reinforcement main rod 2
3...Pin 24...Bracket 25...
・Pin 27...Neno rod 28...Nut

Claims (1)

[Claims] A large number of support elements formed into a triangular shape by joining a main rod and a pair of side rods are connected to each other by pin connections at the ends of each main rod, and the joints of both side rods of each support element are connected to the secondary rod. The main rods of each supporting element are connected to each other to form an arch-shaped frame, and reinforcing main rods are arranged on the outside of the main rods of each supporting element, and the connecting rods have one end pivotally connected to the connecting pin between the main rods. A formwork support for arch concrete construction, characterized in that the reinforcing main rods are connected to each other at the other end.