JP2516358B2 - Form support for arch concrete construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a support for a formwork applied to the construction of arch concrete in an arch bridge or the like.

(Prior Art) When constructing a concrete structure such as an arch bridge, the construction work, especially the formwork support facility required for the construction of arched concrete between bridge 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 the direction perpendicular to the formwork surface in any case, the arch concrete on the slope part applies not only the vertical load but also the 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 something similar, and the supporting work 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.

The present inventor, in view of such an actual situation, has found that Japanese Patent Application No. 60-1392
With the invention of No. 97 etc., we have been developing economical and easy-to-construct support for arch concrete formwork. According to the supporting work of this 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 end of the main rod, and at the connecting portions of the both side rods are sub-subtracted from each other. With a structure that is connected by a rod, the support of the truss structure that supports the form 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 is possible to apply it again for the construction of arch concrete with different arch shapes of various sizes, and it is possible to make great improvements over the entire construction, such as material saving and simplification of construction. is what happened.

(Problems to be solved by the invention) By the way, in a temporary structure such as a support work,
It is economically important to use a standardized material that can be used as a member that constitutes it.

The supporting work according to the present invention is also designed so that it can be widely applied to arch concretes of different spans by combining unit supporting elements of the same structure which are unitized. However, if a supporting work with a span considerably longer than the design standard is to be constructed, the unit supporting elements up to that point will have insufficient strength. Therefore, also in the support work of the above invention, there is a natural limit to the width of adaptation to the size of the span length.

The present invention has been made for the purpose of broadly expanding the range of application in the supporting work of the method of combining the above-mentioned unit supporting elements, and the above-mentioned unit supporting element has most of the stress ( Focusing on that (compressive stress) acts, the strength of the main rod is doubled and increased by making the main rod a combination frame of two upper and lower stages, and the applicable range of form support work using unit support elements is increased. It is an attempt to spread widely.

If the main rod has a two-stage upper and lower combined structure, there is a problem that the total length of the upper and lower rods is greatly different. It is one main rod, one manufacturing error and one assembly error,
Due to an error in the height of the mounting base of the supporting part of the main rod, and a difference in the amount of deformation of both main rods when deformed (compressive strain) under the load of concrete, the stress received by both main rods is imbalanced. Occurs. This is a big problem, and in extreme cases, for example, the upper rod (reinforcing main rod) bears most of the stress and the lower rod (main rod) bears almost no stress. . The present invention aims to solve this problem and provide a standardized and economical formwork support for arch concrete construction with a wide range of applications.

(Means for Solving the Problems) The structure of the present invention will be described with reference to FIGS. 1 and 2 corresponding to the embodiment. According to the present invention, the main rod 11 and the pair of side rods 12, 12 are combined to form a triangle. A large number of supporting elements 15 formed on each of the main rods 11 are connected to each other by pin couplings 17 at the ends of the respective main rods 11. Further, reinforcing main rods 22 are provided outside the main rods 11 of the supporting elements 15, respectively. Then, the main rods 11 are linked to each other to form a semi-arched truss structure, and the pair 10a, 10b thereof is
At their top ends, a pin connection 30 is made through end connecting rods 31, 31 connecting the respective ends of the main rod 11 and the reinforcing main rod 22 to each other, and each semi-arched truss structure 10a. The main rods 11 and the reinforcing main rods 22 forming a pair in 10 and 10b are fixed by a spacing member 20, and the semi-arched truss structures are formed.
A bracket provided on the piers 1 and 1 at the center of the terminal connecting rods 18 and 18 in which the main rods 11 and the reinforcing main rods 22 at the lower end portions of 10a and 10b are joined.
It is characterized in that pin couplings 26 and 26 are respectively made to 24 and 24.

(Example) Hereinafter, an example of the present invention will be described with reference to Figs.

In the figure, 1 and 1 are leg structures constructed at a predetermined interval before placing arch concrete 8; 2 is an arch form frame laid between the leg structures; 10 is the arch It is an arch-shaped supporting work for supporting the form, and the arch-shaped form 2 is a flap material 3 formed in an arch shape.
Are arranged in parallel and are appropriately connected by a lateral flap material (not shown), and a weir plate 4 is attached to the outside of the flap material 3.

The arch-shaped support structure 10 has side rods 12, 12 on both ends of the main rod 11.
A support element in which one end of each of these is connected 13 and the other ends thereof are connected to each other via a connecting plate 14 to form a triangular structure.
15 is formed, and this is used as a unit constituent member,
The main rods 11 and 11 are connected to each other by a pin 17 at their ends, and the connecting plates 14 and 14 of the supporting elements 15 and 15 are connected to each other by a sub-rod 16 shorter than the main rod 11 to form a semi-arch as a whole. Shaped truss structure. The sub rod 16 may be attached to the connecting plate 14 by pin connection 19, but an auxiliary plate (not shown) may be connected to the connecting plate 14 by pin connection.
The sub-rods 16 may be fixed to the plate by welding. Then, the pair of semi-arched truss structures 10a and 10b are connected to each other at their ends to form an arch support structure 10, as will be described later.

The size of the curve formed by the arch support structure 10 is determined by the length of the auxiliary rod 16. Therefore, the arch support structure 10 can be freely changed in its degree of curvature by changing only the length of the sub-rod 16, and the degree of curvature can be freely increased or decreased in 15 units of each support element.
It will also be possible to accommodate the construction of arch-shaped frames that bend in a complicated manner.

Also, the truss structure 10a formed on the semi-arch,
Outside the main rods 11 and 11 of each supporting element 15 in 10b, reinforcing main rods 22 and 22 formed in the same manner as the main rod 11 with a required interval.
While arranging each of them, one end of a connecting rod 21, 21 of a required length is pivotally attached to the connecting point of the main rods 11, 11 with each other through a pin 17, and each of the reinforcing main rods 22, 22 is attached to the other end. The ends are pivotally attached, and the connecting rod 21 and the reinforcing main rods 22, 22 are connected to each other by a pin 23. And, the end portions of the reinforcing main rods 22 and 22 located on the respective top end sides of the truss structures 10a and 10b are connected to the end portions of the main rod 11 at one end thereof with a pin 32 so as to pivot the pin-shaped top end rod.
It is pivotally attached to the other end of 31 by a pin 33. Further, the main rod 11 and the auxiliary main rod 22 located at the lower end portions of the truss structures 10a and 10b, respectively.
Each terminal part of the terminal connecting rod 18 formed wider than the connecting rod 21.
Pins 25, 25 are connected to both ends of the.

The half arch supports 10a and 10b configured in this way are joined to each other by joining the end connecting rods 31 and 31 on the top end side thereof to the pin 3
They are connected by 0, and as a result, the support structure 10 is formed by the arch-shaped truss frame as a whole. The arch support structure 10 is constructed by fixing the central portions of the terminal connecting rods 18, 18 to the brackets 24, 24 fixed to the piers 1, 1 by pins 26, 26, respectively.

As described above, the main rods 11, 11 and the reinforcing main rods 22, 22 of the arch support structure 10 are the connecting rods 21, 21, the top end connecting rods 31, 31, and the terminal connecting rods 18,
18 and are linked to each other. in this case,
Since the length of the main rod 11 and the reinforcing main rod 22 are almost the same, the main rod 11
There will be some deviation in the length direction between the main rod and the reinforcing rod 22, but the deviation is due to the inclination and length of the connecting rods 21 and 21 and the terminal connecting rods 18 and 18 as shown in the figure. You can adapt to changes.

Also, if the deviation is large, it can be conveniently formed by inserting and adjusting a proper number of reinforcing main rods having an irregular length.

In this way, the arch supporter 10 is provided on the outside of the main rods 11 and 11 which are pin-connected to each other, and the reinforcing main rods 22 and 22 which are pin-connected to each other.
Are linked and integrated by the connecting rods 21,21, the top end connecting rods 31,31 and the terminal connecting rods 18,18, so that if the length of the sub rods 16,16 is changed, the curvature of the arch can be changed. It can be changed to some extent. Even if you change the degree of curvature significantly,
Along with changing the length of 16,16, a small number of reinforcing main rods 22 and connecting rods 2
It has excellent versatility that it can be handled by changing the length of 1,21. It should be noted that with only the above configuration, the main rod 11,11
Since the entire reinforcing main rods 22 and 22 move in parallel and are not stable, a structure for stopping the parallel movement of both main rods is provided by the spacing member 20. That is, one end of the pair of main rods 11 at the top or the middle of each semi-arch truss structure 10a, 10b and the auxiliary main rod.
Rod-like spacing members 20, 20 are respectively passed to the other end of 22 and are connected and erected by pins 17, 33.

It should be noted that the installation of the spacing member 20 is not limited to the illustrated means, and any means that can relatively fix the main rod 11 and the auxiliary main rod 22 can be adopted.

The arch support 10 having the above-described structure is provided in a plurality of rows at a required interval in the depth direction of the arch concrete to be constructed, and each of the support is supported by the side rods 12, the main rods 11, the reinforcing main rods 22 and the like. The three-dimensional connection is formed by a depth direction connecting rod (not shown) to form the entire supporting structure.

The reinforcing main rod 22 of each supporting element 15 is attached to the reinforcing main rod 22.
Through which the screw rods 27, 27 are mounted, and the reinforcing main rod 22 is sandwiched between the screw rod 27 and the nuts 28, 28 which are screwed into the screw rod 27 so as to be fixed. The projecting length from the reinforcing main rod 22 can be adjusted by adjusting the screwing-related position of the.

The formwork 2 is erected on the frame arch support. That is, the flap material 3 is arranged outside the reinforcing main rods 22, 22 of the arch support, and the pin 7 is inserted into the pin hole of the flap material 3 and the pin hole at the end of the screw rod 27 which are provided in advance. It is fixed to the reinforcing main rod 22 via the screw rod 27, and the weir plate 4 is attached to the outer surface of the flap material 3. At that time, the position and the arc of the mold can be appropriately adjusted by adjusting the projecting length of the screw rod 27 with respect to the reinforcing main rod 22.

After erection of the formwork 2, the auxiliary formwork 6 is installed between the end of the formwork 2 and the bridge pier 1, the outer formwork 5 is erected, and the concrete 8 is placed between both formwork 2 and 5. To do. Concrete 8
After curing, the outer frame 5 and the auxiliary frame 6 are removed, then one of the nuts 28 is loosened and the other is tightened to shorten the protruding length of the screw rod 27, and the mold is inserted through the flap material 3. The frame 2 will be pulled toward the reinforcing main rod 22, and thereby the form 2 will be separated from the concrete 8.

After the construction of the arch concrete 8 is completed, it is usual to dismantle and remove the formwork 2 and the support structure 10. In this case, the bracket 24 with the main rod 11 and the reinforcing main rod 22 is fixed to the pier 1. If you do not do this, lay a long rail in the depth direction on the pier 1, attach moving wheels to the end of the main rod 11, and move the arch support 10 along the rail. The mold 2 can be moved to the next construction site without being disassembled in a state of being separated from the concrete 8.

(Effects of the Invention) As described above, according to the present invention, the 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 end of the main rod, and both sides are connected. The reinforcing rods are connected to each other at the connecting portions of the rods by sub-rods, and the reinforcing main rods are arranged outside the main rods of the supporting elements in parallel with the main rods, and the reinforcing rods are connected to each other. By linking with each other to form a semi-arch type support, and by pairing the pair at the top end with each other to form an arch support, the support of the truss structure that supports the formwork is firm. Moreover, it is easy to assemble and dismantle, and the shape of the arch can be changed mainly by changing the length of the secondary rod. Therefore, it can be applied again to the construction of arch concrete of different sizes. It becomes possible to save materials and omit them. Can be achieved. In addition, since the reinforcing main rod is connected to the main rod that receives most of the stress through the connecting rod, the strength is doubled.

And, the connected reinforcing main rod in the arch support is
It is linked to the main rod connected by the connecting rod, the top end connecting rod and the terminal connecting rod, is attached to the bracket provided on the pier at the center of the terminal connecting rod, and is paired in each semi-arched structure. Since the main rod and the auxiliary main rod of the main rod are fixed by the spacing member, the relative parallel movement of the main rod and the reinforcing main rod is restrained and stabilized, and the error in the length of both main rods after assembly is suppressed. , The imbalance of the stress applied to both main rods due to the difference in the height of the mounting base of the main rod both-end bearings and the difference in shrinkage caused by the load of arch concrete is eliminated, and both main rods always apply the stress evenly. Since a sharing mechanism can be obtained, the design calculation stress of the support work and the actual stress will be exactly the same, which makes it extremely reliable, and it will be possible to put the upper and lower two-stage combined main rod configuration to practical use, thus standardizing it. The applicable range of the specified unit support element is large. It is enlarged. As a result, arch support can be constructed by diverting and combining almost the same members for various arch span sizes, which greatly increases the economic efficiency of arch support and greatly increases the construction cost. It has many excellent effects such as savings.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a construction mode using a supporting work according to an embodiment of the present invention, and FIG. 2 is an enlarged side view showing a main part of the supporting work. 1 ... Bridge pier, 2 ... Arch form 5 ... Outer form, 6 ... Auxiliary form 8 ... Concrete, 10 ... Arch support 10a, 10b ... Semi-arch truss structure 11 ... Main rod, 12 ...... Side rod 15 ...... Unit support element, 16 ...... Sub rod 17 ...... Pin, 18 ...... Terminal connection rod 20 ...... Space maintaining member, 21 ...... Connection rod 22 ...... Reinforcement main rod, 23 …… pin 24 …… bracket, 25 …… pin 27 …… screw rod, 28 …… nut 31 …… top end connecting rod

Claims (1)

(57) [Claims] 1. A large number of supporting elements formed in a triangle by connecting a main rod and a pair of side rods to each other are connected to each other by pin connection at the ends of each main rod, and further, each main element in each supporting element. Reinforcing main rods are connected to the outside of the rods, respectively, and linked to each main rod to form a semi-arch type truss structure, and a pair of them are mutually connected at their top ends to each other. Pins are connected through end connecting rods that connect the respective end portions of the reinforcing main rods, and a pair of main rods and reinforcing main rods in each semi-arch type truss structure are connected by a spacing member. It is characterized in that the center portion of the terminal connecting rod that is fixed and that connects the main rod and the reinforcing main rod of each lower end of each of the semi-arched truss structures is pin-connected to a bracket provided on the pier, respectively. Form support for arch concrete construction.