JPH08284292A - Fixture of net form - Google Patents

Abstract

PURPOSE: To efficiently carry out installation of a net form constructing a concrete structure in a reinforcement bar while saving labour. CONSTITUTION: A fixture 1 is formed by integrally and continuously forming a cylindrical installation part 3 to elastically and externally fit and fix by means of press fitting it into a steel reinforcement from an opening part 2 and an arm 4 projected outward from this installation part 3 by a flexible material. An engagement recessed part 5 to push a rib part (a) of a net form A into it is provided on a head end of the arm 4, and the net form A is firmly fixed on the steel reinforcement with a specified interval.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fitting for temporarily fixing a net formwork of a steel lath plate used for constructing a concrete structure to a reinforcing bar.

[0002]

2. Description of the Related Art When constructing concrete structures, the net formwork method, which uses a net formwork made of steel lath plate as a formwork, saves labor and shortens the construction period compared to the conventional construction method using panel formwork. It has many merits such as cost reduction.

By the way, in the net formwork construction method, the net formwork is arranged at positions on both sides of the reinforcing bar after the reinforcing bar is laid, the net formwork is temporarily fixed to the reinforcing bar, and then the facing surfaces of the opposing net formwork. Must be held at a constant interval with a separator.

Conventionally, the method of temporarily fixing the net formwork to the reinforcing bar uses a vertical disk of a stirrup by using a disc-shaped plate with a flexible synthetic resin and an external fitting portion at the center. This is done by externally fitting the plate to the part, bringing the net form frame into contact with the outer peripheral edge of the plate, and binding the net form frame to the plate with a wire material such as wire.

[0005]

By the way, the above-mentioned disc-shaped plate has a weak fixing strength with respect to the reinforcing bar and is unstable, and when external pressure is applied, the plate easily tilts with respect to the reinforcing bar and cannot maintain the space firmly. Therefore, it is necessary to hold the space between the opposing net molds by the separator.

However, since the separator for holding the space between the net formwork has a structure having washers for regulating the space at both end positions, the separators are arranged between the net formwork facing each other at a predetermined distance. Therefore, there is a problem in that the washer at the end is an obstacle, work is difficult to perform, and it is necessary to arrange a worker outside the net formwork on both sides.

Further, the work of binding and fixing the net form frame to the plate by wire is inefficient and takes a lot of time and labor.

[0008] Therefore, an object of the present invention is to attach the net formwork to the reinforcing bar firmly, to keep the space between the net formwork, and to fix the net formwork labor-savingly and efficiently. To provide.

[0009]

In order to solve the above problems, the present invention provides a cylindrical mounting portion for press-fitting into a reinforcing bar through an opening provided in a part of the periphery and elastically fitting and fixing the reinforcing bar. An arm projecting outward from the outer surface of the cylindrical mounting portion in a state parallel to the axial direction of the mounting portion is formed of a flexible material, and a locking recess of a net form is provided at the tip of the arm. It adopts a different configuration.

[0010]

[Function] By pushing the tubular mounting portion of the fixture into the vertical portion of the reinforcing bar from the opening portion by utilizing the flexibility, the mounting portion is externally fitted and fixed to the reinforcing bar, and the arm projects outward. Make a state.

Next, by pushing the rib portion of the net form frame, which is exposed to the outside of the reinforcing bar, into the locking recess at the tip of the arm to lock the rib, the net form frame can be fixed to the reinforcing bar. It is possible to maintain a constant distance between the reinforcing bar and the net formwork, whereby the distance between the facing surfaces of the net formwork arranged on both sides of the reinforcing bar becomes a specified dimension.

In the mounting tool, the cylindrical mounting portion is externally fitted to the reinforcing bar, and the arm projecting from this mounting section is parallel to the axial direction of the reinforcing bar, so that it has excellent support strength against external pressure from the net form side. The fixture allows the spacing of opposing net forms to be maintained.

[0013]

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

As shown in the figure, the attachment 1 is a cylindrical attachment 3 fitted and press-fitted into a vertical portion of the reinforcing bar through an opening 2 in the longitudinal direction provided in a part of the periphery, and an outer surface of the attachment 3. The arm 4 protruding from the end is integrally formed by using a flexible synthetic resin such as polyethylene or a material having the same effect, and the tip of the rib portion a of the net form A is pushed into and fixed to the tip of the arm 4. It has a structure in which an opening-shaped locking recess 5 is provided.

The tubular mounting portion 3 has an inner diameter that is elastically fitted and fixed to the reinforcing bar, and the vertical length in the axial direction is such that a stable fixing strength can be obtained for the reinforcing bar. The opening 2 has a width that allows the mounting portion 3 to be press-fitted into the reinforcing bar.

The arm 4 projects in the radial direction of the mounting portion 3 from a position perpendicular to the opening 2 on the outer surface of the cylindrical mounting portion 3, and the vertical direction is parallel to the axial direction of the mounting portion 3. There is.

Reinforcing ribs 6 are provided on the upper and lower ends of the arm 4.
In addition, the locking recess 5 at the tip has an upper and lower opening width into which the rib portion a of the net form A fits. A locking claw 7 that guides this rib portion a into the locking recess 5 at the time of pushing, and locks the rib portion a housed in the locking recess 5
7 are protruded.

FIG. 2 and FIG. 3 showing the usage state of the attachment 1.
In, the net form A is formed by using a steel lath plate, and has horizontal rib portions a at regular intervals in the vertical direction.

Further, in the case shown, the reinforcing bars B are those for underground beams, and the nets arranged on both sides of the reinforcing bars B with the fittings 1 mounted on the vertical portions of the stirrup b. Form frame A has a vertical end thickness 11 and a horizontal end thickness 12 on its outer surface.
13 and the separator 13 inserted between both net formwork A
The pressure at the time of pouring concrete is supported by attaching the binding metal fittings 14 for receiving the lateral thick 12 at both ends of the.

The support of the present invention has the above-mentioned structure. Next, a method for constructing a concrete structure will be described.

As shown in FIG. 2, after the reinforcing bars B are installed on the discarded concrete 15 at the designated positions which have been marked out beforehand, the reinforcing bars B are placed at the vertical portions of the stirrup b at positions corresponding to the rib portions a of the net form A. Fix the fixture 1.

As shown in FIG. 3, the attachment 1 may be formed by pressing the cylindrical attachment 3 into the vertical portion of the stirrup b from the opening 2, and the opening 2 is expanded due to the elasticity of the flexible material. Then, it is forcedly passed through the stirrup b, and the tubular mounting portion 3 is elastically fitted and fixed to the stirrup b by the restoring elasticity.

As shown in FIG. 3, the attachment 1 attached to the vertical portion of the stirrup b is in a posture in which the arm 4 projects outwardly of the stirrup b, and in this state, the net form A is provided on both sides of the reinforcing bar B. Are arranged upright, the net form A is pressed toward the reinforcing bar B, and the rib portions a are pushed into the corresponding locking concave portions 5 of the fixture 1, so that the rib portions a become the locking concave portions 5. The net form A is attached to both sides of the reinforcing bar B while being retained inside in a retaining manner.

In the mounting tool 1, the cylindrical mounting portion 3 is fitted onto the vertical portion of the stirrup b, and the arm 4 projects in a state where the vertical direction is parallel to the stirrup b. Since the tubular mounting portion 3 is externally fitted and fixed to the stirrup b and the rib portion a of the net form A is retained and retained by the locking recess 5 in a retaining manner, the stirrup is supported. The net form A can be fixed to b at a constant interval, whereby the fixture 1
Has a function of maintaining the distance between the net forms A facing each other.

Therefore, the separator 13 arranged between the opposing net molds A does not need the function of regulating the space between the opposing faces of the net mold A, and a separator without a washer can be used. Separator 1 between frames A
The insertion work of No. 3 can be performed by inserting from one net formwork into the other formwork, and labor saving and efficiency improvement of the work can be achieved.

If the metal fittings 14 are attached to both ends of the separator 13 and the outer surface of the net form A is supported by the vertical end thickness 11 and the horizontal end thickness 12, concrete is placed between the opposing net form A. , A concrete structure can be constructed, and the net formwork A smoothly carries out excess water at the time of placing concrete, so that the lateral pressure is greatly reduced. Therefore, the supporting material and the binding material can be simplified, and the concrete can be simplified. The surface of is a rough surface, a part of which is exposed from the lath, and is good as a finishing base.

In the illustrated case, the fixture 1 and the net form A are used for forming the underground beam, but they are widely used for concrete form work for constructing cloth foundations, retaining walls, wall surfaces, etc. Can be used.

[0028]

As described above, according to the present invention, the net formwork can be fixed to the reinforcing bar easily and efficiently and labor-savingly, and the net formwork can be fixed to the reinforcing bar at a constant interval with high accuracy. Since it has the function of maintaining the spacing of the net form, it is possible to simplify the spacing maintenance work by the separator.

[Brief description of drawings]

FIG. 1 is a perspective view of a fitting according to the present invention.

FIG. 2 is a vertical cross-sectional view of the net formwork construction method showing the same usage state as above.

FIG. 3 is a perspective view of a main part of the same.

[Explanation of symbols]

 1 Mounting Tool 2 Opening 3 Cylindrical Mounting 4 Arm 5 Locking Recess 7 Locking Claw

Claims (1)

[Claims] 1. A tubular mounting portion for press-fitting into a reinforcing bar by elastically fitting and fixing it through an opening provided in a part of the periphery, and a mounting portion of the mounting portion facing outward from the outer surface of the tubular mounting portion. An attachment tool for a net form, in which an arm protruding in a state parallel to the axial direction is formed of a flexible material, and a locking recess of the net form is provided at a tip of the arm.