JPS6242055Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has one end attached to a concrete formwork and the other end attached to a fixed object such as the earth, so that the concrete formwork can be fixed to a predetermined position. The present invention relates to a support member for concrete formwork which is adapted to be tensioned and held in position.

[Prior art] When the concrete formwork is installed only on one side, or when the distance between the concrete formworks is long, the surface of the concrete formwork where concrete is to be poured can be fixed with vertical or horizontal studs. However, on the concrete pouring side, support metal fittings are often used that have one end fixed into the ground and the other end connected to the concrete formwork.

Generally, when there is a long distance between a pair of concrete formworks, it is known to use a connecting fitting with a U-shaped cross section and a turnbuckle in the middle, as shown in Japanese Patent Application Laid-open No. 53-155221, for example. .
However, since the surface of the concrete formwork on the concrete pouring side is supported only by connecting fittings,
This results in insufficient support on the concrete pouring side.

Furthermore, a technique for fixing to a fixed object such as the earth using a hook portion is described in, for example, Japanese Utility Model Application Publication No. 53-62038. However, this known technique uses a spring to press the concrete formwork from the side opposite to the concrete pouring surface, and therefore has the same effect as a combination of vertical end thickness and horizontal end thickness. , it is not possible to provide tensile support to the concrete pouring surface side.

U.S. Patent No. 1,580,981 discloses that a fastener for tightening a pair of formwork against a constructed concrete surface includes an eye bolt embedded in the concrete surface, a rod that engages with the eye bolt, and a screw attached to the rod. This method consists of a block and a screw that is screwed into the screw block, and the screw tightens the formwork and is removed after concrete is poured. However, such techniques require slanting the holes through which the screws pass through the formwork;
Therefore, it is not versatile, and if the screws are removed after concrete is poured, holes will be created there, and the blocks will rust due to rainwater infiltration. Furthermore, since the eye bolt and rod engage at an angle, bending moment is applied to the eye bolt when tightening.
It cannot be tightened sufficiently.

Furthermore, in Japanese Utility Model Publication No. 37-1048, two hook bolts are engaged with a concrete formwork for a retaining wall.
Both bolts are shown with adjustable lengths using screws. However, in this technique, the two hook bolts are installed bent in an F-shape, so when the screws are tightened, a bending moment acts on the hook bolts, and especially when the angle of the two hook bolts is large, the tightening force increases. It doesn't take enough,
In addition, a bending moment causes precipitation loss. For example, as stated in Utility Model Publication No. 29-1540,
The anchor part to be buried underground is tilted, or
It is possible to pivot the connecting fittings at the above-ground end of the anchor part, but if the connecting fittings cannot be installed at right angles to the concrete formwork due to the relationship between the position of the anchor part and the position where the connecting fittings are attached to the concrete formwork. Therefore, it is necessary to prevent concrete from leaking from the place where the connecting fittings are attached to the concrete formwork.

Generally, when metal fittings are buried in unsolidified fresh concrete, the position of the metal fittings will shift after solidification. Therefore, fine adjustment of the tightening force is required.

[Purpose of the invention] Therefore, the purpose of the invention is to make it possible to pull the concrete formwork on the concrete pouring surface side without causing an inward bending moment and with fine adjustment, and to make it possible to pull the concrete formwork on the concrete pouring surface side so that the end part is like the ground. To provide a support member for concrete formwork which is fixed to a fixed object.

[Structure of the invention] According to the invention, one end of the concrete is attached to a concrete formwork and the other end is attached to a fixed object to tension and hold the concrete formwork in a predetermined position. The support member of the formwork includes an intermediate bar having one end connected to the ear member fixed to the concrete formwork through a pin, and the other end of the intermediate bar is connected to a first end through a pin.
A turnbuckle portion connected to one end of the threaded rod portion and threadedly engaged with a threaded portion formed on the other end of the first threaded rod portion has a turnbuckle portion threaded in the opposite direction to the threaded portion of the first threaded rod portion. The threaded rod portion of the second threaded rod is threadedly engaged with a threaded portion at one end, and the other end of the second threaded rod is provided with a hook portion that is embedded in a fixed object on the concrete casting side of the concrete formwork, and The bar is U-shaped in cross section and has a through hole drilled in its side for receiving the pin of the ear member and the first threaded rod portion.

[Operation and effect of the invention] Therefore, when the ear member is first attached to the concrete pouring side of the concrete formwork, since the intermediate bar is pivotally attached with a pin, the ear member faces horizontally when installed. However, the intermediate bar can be tilted. The hook part of the second threaded rod part is connected to a fixed object, for example, a first part buried in the ground and connected to an intermediate bar.
The concrete formwork is connected to the threaded rod part by a turnbuckle, so when the turnbuckle is rotated, the concrete formwork is pulled toward the concrete pouring surface.
According to the present invention, since the opposite side of the concrete formwork is fixed by the studs as is known in the art,
The concrete formwork is fixedly supported from both sides to provide strong support. In addition, the intermediate bar having a U-shaped cross section is strong against bending moments and can be supported in an inclined state by pivoting with pins. Further, the length can be easily adjusted using the turnbuckle, making it extremely suitable for fixing relatively large concrete formwork.

In particular, according to the present invention, the ear member and the intermediate bar are connected by pins, and the intermediate bar and the first threaded rod part are also connected by pins, so that both can rotate at these parts, and as a result, , ear member, intermediate bar,
No bending moment acts on the first and second threaded rod portions, turnbuckles, and hook portions. For this purpose, only tensile stress acts substantially, so the cross-sectional area of each part can be made relatively small, and only the shear stress of the pin needs to be calculated. Therefore, stress due to unreasonable bending moment does not act on each part, and bending deflection can be kept to a minimum. Further, even if the hook moves slightly due to the turnbuckle, the tightening force can be finely adjusted, which is convenient.

Because of this pin connection at the ear member,
If you determine the direction in advance when burying the hook part in the specified position, the first and second threaded rod parts will be bent by the pins immediately on the concrete pouring side of the concrete form. Even if an unreasonable force is not applied and the bottom surface of the hook portion shifts slightly, the error can be absorbed by the pin at the ear member and the pin at the intermediate bar. Therefore, the combination of the two pins and the turnbuckle makes it possible to install the concrete formwork in a diagonal direction with respect to the fixed object on the concrete pouring side without creating any undue force. Therefore, the installation work of the hook part is easy.

[Preferred Embodiment] When implementing the present invention, a sufficient tensile force can be obtained if the inclination angle of the intermediate bar is relatively small. Therefore, when the ear member is installed at a relatively low position, one intermediate bar is sufficient, but when the ear member is installed at a relatively high position, it is preferable to use additional intermediate bars.

[Examples] Examples of the present invention will be described below with reference to the drawings.

In Figure 1, a pair of concrete forms 1,
1, the upper parts thereof are connected by connecting fittings 2, 2, and the concrete pouring surface side is supported. At the bottom thereof, there is a fine adjustment member 20 including an ear member 30, an intermediate bar 10, a turnbuckle 25, and a hook portion 2.
It is supported by a support member A having a second threaded rod portion 23 (FIG. 2) with a diameter of 4. This support member A
The details are shown in FIG.

In FIG. 2, the first intermediate bar 10 has one end connected to an ear member 30 inserted and fixed into the concrete formwork 1, and the other end connected to a fine adjustment member 20, which will be described later. Its cross section is approximately U-shaped. and both side walls 11
A through hole 12 for one piece is bored on the ear member 30 side of the intermediate bar 10 by inserting a connecting pin 32 between the through hole 12 and the hole 31 of the ear member 30.
The ear member 30 and the ear member 30 are bently connected to each other. Further, a plurality of through holes 13, 13 are arranged in a row on the side of the fine adjustment member of both side walls 11, and the fine adjustment member is connected to any of these through holes.

The fine adjustment member 20 includes a first threaded rod portion 22 connected to the first intermediate bar 10 with a pin 21, and a second threaded rod portion 23 fixed to a fixed object, for example, the ground G hardened with concrete. The turnbuckle portion 25 is formed by forming right and left reverse threads in the substantially central portion thereof, so that the length can be finely adjusted. The end of the second threaded rod portion 23 also has a hook portion 24 for effective attachment to a fixed object.
is formed.

Since the support member for concrete formwork according to the present invention is constructed as described above, its use is
As shown in the figure, it is used as a tension member between the ear member 30 inserted and fixed into the concrete formwork 1 and a fixed object, such as the ground G, and its length can be largely adjusted by using the first intermediate bar. Insert the first threaded rod portion into the appropriate through hole 6 drilled in the pin 2.
1, and fine adjustments are made by rotating the turnbuckle portion 25 to the left or right.

[Summary] As described above, according to the present invention, no bending moment is generated by connecting two pins, and fine adjustment can be made by the turnbuckle. The U-shaped cross section of the intermediate bar facilitates pin connection with the first threaded rod portion. In this way, the length of the supporting member of the concrete form can be finely adjusted, so that the concrete form can be set in an accurate position. Also, since the length can be adjusted to a large extent, the work of setting concrete forms can be done extremely efficiently. Furthermore, even if the concrete forms are spaced far apart, the forms are held in place by short support members, resulting in lower material costs.

Since no bending moment is applied, it is possible to firmly support the concrete pouring surface side of the concrete formwork.

In particular, when the fixed object is concrete, if the hook is inserted in an unhardened state, the dimensions will change as it hardens, but this can be adjusted with a turnbuckle, which is preferable.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the use of a support member for a concrete form according to the present invention, and FIG. 2 is a perspective view of a support member for a concrete form according to the present invention. DESCRIPTION OF SYMBOLS 10... First intermediate bar, 11, 11... Side wall, 13... Through hole, 20... Fine adjustment member, 22...
...First threaded rod portion, 23...Second threaded rod portion, 24...Hook portion, 25...Turnbuckle portion.

Claims (1)

[Scope of utility model registration request] A support member for a concrete form that is attached at one end to the concrete form and at the other end to a fixed object for tensioning and holding the concrete form in place. The ear member to be secured has an intermediate bar connected to one end via a pin, the other end of the intermediate bar is connected via a pin to one end of a first threaded rod portion, and The turnbuckle part screwed into the threaded part formed at the other end of the part is threaded with the threaded part at one end of the second threaded rod part, which is threaded in the opposite direction to the threaded part of the first threaded rod part. , the other end of the second threaded rod is provided with a hook portion that is embedded in a fixed object on the concrete casting side of the concrete formwork, the intermediate bar is formed with a U-shaped cross section, and has an ear member and a first screw. A support member for concrete formwork, characterized in that a through hole is bored in the side of the support member into which a pin of a bar portion is fitted.