JPH0612130Y2 - Intermediate bar of separator for concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an intermediate bar for holding a space between concrete formwork by connecting to a joint member fixed to a concrete formwork arranged oppositely by a pin.

[Prior Art] In order to construct a concrete structure such as a retaining wall or a waterway, the formwork is placed at a predetermined interval and concrete is placed between the formworks, while keeping the formwork interval. For this reason, a space maintaining material for the mold, which is usually called a separator, is used.

There are various types of separators, but in many cases, a joint member fixed to the opposing concrete formwork is usually connected to a bar member called an intermediate bar by a pin to maintain the formwork space. It is used. A large number of pin holes are formed in the intermediate bar at predetermined intervals, and the intervals between the molds can be adjusted by selecting appropriate pin holes and inserting the pins.

As the intermediate bar in this type of separator, a flat plate, an L-shaped cross section, a U-shaped cross section, a rod-shaped one, etc. have been conventionally proposed. Can be manufactured at low cost, but they have the drawback of weak bending strength. Also, L-shaped or V-shaped
The bending strength is quite strong, but the flat plate part that connects the joint member to the mold (the flat plate part of the joint member is sandwiched between the molds to fix the joint member to the mold) and the L-shaped part that connects to the intermediate bar. Alternatively, the joint member has a complicated structure because it has to be formed in the U-shaped portion, and in the case of a rod, the connecting side with the joint member must be processed into a flat plate shape.

Further, any of the conventional intermediate bars has only one connecting portion for connecting with the joint member, and when the positions of the joint members are deviated from each other due to the installation condition of the concrete formwork, the intermediate bar and the joint member are There was a drawback that it became difficult to connect.

Generally, a technique is known in which the connecting portion between the intermediate bar and the joint member is pin-connected, and the connecting length is variable by providing a plurality of pin holes.
It is disclosed in Japanese Patent No. 248. However, such a known technique requires a lot of man-hours because the pins are pre-welded or wedges are used. Also, since it is a flat plate as a whole, it is weak against a bending moment, and the structure is complicated, making it difficult to process. Met.

[Problem to be solved] Therefore, an object of the present invention is to provide a concrete formwork which can be easily manufactured from a long metal plate, has sufficiently high strength, and can be easily continuously operated even if the joint members are displaced from each other. To provide a middle bar for the separator.

[Means for Solving the Problems] According to the present invention, the joint members (2A, 2) fixed to the concrete formworks (1A, 1B) arranged to face each other.
In the intermediate bar (4) which is connected to B) by the pin (6) to maintain the space of the concrete formwork, the intermediate bar (4) has a substantially Y-shaped cross section and has three blade pieces (4).
a, 4b, 4c) and each winglet (4a, 4b,
4c) has a large number of pin holes (5) formed at appropriate intervals, one of the blades (4c) of which is continuous with the other two blades (4a, 4b). Is formed in a U shape, and is formed by bending a long flat metal plate as a whole, and any one pin hole (5 of each wing piece of each wing piece (4a, 4b, 4c) (5 ) And the joint member (2A, 2B) by inserting a pin (6) into a pin hole formed in the joint member (2A, 2B) so as to maintain the mold space.

[Explanation of Operation and Effect] Therefore, when assembling the concrete formwork, one end of the joint member is fixed to the concrete formwork arranged at a predetermined interval and opposed to each other, and one of the wing pieces of the intermediate bar is winged. The pin may be inserted into any one of the pin holes and the pin hole formed in the joint member to connect the joint member and the intermediate bar.

In this way, the concrete formwork is held at a predetermined interval, but when the positions of the joint members are displaced due to the installation condition of the concrete formwork, one joint member and one wing piece of the intermediate bar are used. On the other hand, it can be dealt with by connecting the joint member with the other one of the wings of the intermediate bar.

Further, the intermediate bar according to the present invention is easy to manufacture because it suffices to bend and process a long metal plate into a Y-shape, and since it is Y-shaped, the bending bar can be bent in any direction. Therefore, it is safe for a worker to work on the intermediate bar after the installation is completed, and the work efficiency is improved.

Further, since the three blades are provided, the position and pitch of the pin holes can be changed in three ways, and it is possible to cope with changes in length.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In the concrete formwork 1A, 1B installed at a predetermined interval in FIG. 1, a joint member 2 is provided between the formwork.
Formwork 1A, 1B and joint member 2 sandwiching A and 2B
The joint members 2A and 2B are fixed by inserting the pin 3 into the pin holes formed in A and 2B. An intermediate bar, generally designated by 4, is connected to each joint member 2A, 2B by a pin 6 so that the formwork 1A, 1B is held at a predetermined interval. Formwork 1A installed in this way,
Concrete is placed between 1B according to the conventional method to construct a concrete structure such as a retaining wall or a waterway.

2 and 3 show an intermediate bar according to an embodiment of the present invention. The intermediate bar 4 has a substantially Y-shaped cross section and is provided with three blades 4a, 4b, 4c. . A large number of pin holes 5 are formed in each blade 4a, 4b, 4c at appropriate intervals, and a pin 6 is inserted into one of the pin holes 5 and the pin holes on the joint members 2A, 2B side. As a result, the intermediate bar 4 and the joint members 2A and 2B are connected to hold the concrete formwork 1A and 1B at a predetermined interval. And as shown in the figure, the wing piece 4c is U-shaped,
It is continuous with the wings 4a and 4b.

When connecting the intermediate bar 4 to the joint members 2A and 2B, normally, one of the wing pieces 4a of the intermediate bar 4 is connected.
Select (4b, 4c) and insert the pin 6 into the pin hole 5 and the pin hole of each joint member 2A, 2B to connect the intermediate bar 4 and the joint member 2A, 2B. When the positions of the joint members 2A, 2B are deviated from each other due to, the one joint member 2A is connected to one wing piece of the intermediate bar 4, for example, the wing piece 4a, and the other joint member 2B is connected. It is designed to be connected to another wing piece of the intermediate bar 4, for example, wing piece 4b. This makes it possible to absorb the positional deviation between the joint members 2A and 2B and to connect the intermediate bar 4 and the joint members 2A and 2B without any trouble.

In order to manufacture the intermediate bar 4, as shown in FIGS. 2 and 3, a long flat metal plate is bent to have a Y-shaped cross section. By doing so, the intermediate bar 4 can be manufactured at low cost.

[Advantage of the Invention] Since the intermediate bar according to the present invention has a Y-shaped cross section, it is strong in strength, and the joint member fixed to the concrete formwork is one of the blades of the intermediate bar. That is, since they are connected by the flat plate portion, the joint member may be made of a flat plate material. Also, since the intermediate bar according to the present invention has a Y-shaped cross section and is provided with three wing pieces that can be connected to the joint member, even if the positions of the joint members are slightly deviated from each other depending on the installation condition of the formwork. By connecting one of the wing pieces of the intermediate bar and the other one of the wing pieces of the intermediate bar to the other joint member, it is possible to absorb the positional deviation between the joint members. The intermediate bar and the joint member can be connected without any trouble. Further, at the time of manufacture, it is sufficient to bend a long flat metal plate so that the cross section becomes Y-shaped, and it can be manufactured at low cost. The position and pitch of the pin holes can be changed for each blade, and a structure that can easily cope with dimensional changes can be made.

[Brief description of drawings]

FIG. 1 is a plan view showing a state where concrete formwork is connected by an intermediate bar according to an embodiment of the present invention, and FIGS. 2 and 3 show an intermediate bar according to an embodiment of the present invention. Is a perspective view and FIG. 3 is a cross-sectional view. 1A, 1B ... Concrete formwork, 2A, 2B ... Joint member, 3 ... Pin, 4 ... Intermediate bar, 5 ... Pin hole, 6 ... Pin.

Claims (1)

[Scope of utility model registration request] 1. A concrete formwork (1
In the intermediate bar (4) which is connected to the joint members (2A, 2B) fixed to A, 1B) by the pin (6) to maintain the space of the concrete formwork, the intermediate bar (4) has a cross section of approximately Y. It is letter-shaped and has three wings (4a, 4b,
4c), and each blade (4a, 4b, 4c) is formed with a large number of pin holes (5) at appropriate intervals, and one of the blades (4c) is formed. ) Is formed in a U shape continuously with the other two blades (4a, 4b), and is formed by bending a long flat metal plate as a whole, and each blade (4a, 4b, 4c) is formed. Pin hole (5) and joint member (2A, 2)
The intermediate of the separator for concrete formwork, characterized in that it is connected to the joint members (2A, 2B) by inserting the pin (6) into the pin hole formed in B) to maintain the formwork space. bar.