JP2721650B2 - Method and apparatus for installing concrete formwork - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for installing a concrete formwork for driving concrete.

[0002]

2. Description of the Related Art A conventional method of setting a concrete formwork and an apparatus used in the method will be described with reference to FIG.

[0003] Reference numeral 1 denotes a steel frame main material such as an H-section steel. After welding one end of a stud bolt 2 to the steel frame main material 1, an adjustment metal fitting 3 having both threads cut is attached to the other end of the stud bolt 2. ,
A separator bolt 4 called a round separator is attached to the adjustment hardware 3.
, Respectively, and the concrete formwork 5 is fixed to the tip of the separator bolt 4.

A waterproof ring 6 is fitted around the intermediate portion of the separator bolt 4, and after the concrete is cast and hardened, moisture entering from the outside is blocked by the waterproof ring 6 and seeps into the concrete inner wall. To prevent that.

[0005]

However, according to the conventional method and apparatus, since the water blocking ring 6 is provided on the separator bolt 4, moisture is transmitted through the stud bolt 2 and the adjusting hardware 3 to be close to the concrete inner wall. Infiltrate until For this reason, even if the movement path of the water transmitted through the separator bolt is blocked by the water blocking ring 6, there is a high possibility that the water penetrates through the concrete wall to the inner wall side and oozes out.

Since the water stop ring 6 is simply fitted into the separator bolt 4, the water stop ring 6
The possibility of transmission to the inner wall side through the fitting gap of was high.

[0007] These two points cause the seepage of moisture to the concrete inner wall, and improvement of this point has been awaited.

Accordingly, the present invention provides a method and an apparatus for installing a concrete formwork capable of reliably blocking moisture on the outer wall side of the concrete and preventing seepage of moisture on the inner wall side.

[0009]

According to a first aspect of the present invention, a stud bolt is welded to a main steel member, and an adjustment hardware is screwed into the stud bolt, and a separator bolt is screwed into the adjustment hardware. In a method of installing a concrete formwork for fixing a concrete formwork, in a state where a rubber waterproof ring is fitted to the stud bolt, the stud bolt is welded to the steel frame main material,
The welding heat causes the inner peripheral surface of the water stop ring to be welded to the outer peripheral surface of the stud bolt.

According to a second aspect of the present invention, in the configuration of the first aspect, a flange portion is provided on the outer periphery of the stud bolt, and the water stop ring is sandwiched between the flange portion and one end surface of the adjustment hardware.

According to a third aspect of the present invention, there is provided a stud bolt having one end welded to a steel frame main body, an adjustment hardware screwed into the other end of the stud bolt, and a separator bolt screwed into the adjustment hardware. In a concrete formwork setting device for fixing a formwork to a tip portion of the separator bolt, a ring-shaped water-stop ring which is fitted into the stud bolt and whose inner peripheral surface is welded to the outer peripheral surface of the bolt by welding heat of the bolt. It is provided with.

According to a fourth aspect of the present invention, in the configuration of the third aspect, a flange is provided on an outer periphery of the stud bolt so as to sandwich a water stop ring between the stud bolt and one end surface of the adjustment hardware.

According to a fifth aspect of the present invention, in the configuration of the third or fourth aspect, the water stop ring is formed of a rubber material that expands by absorbing moisture.

[0014]

According to the above construction, since the water stop ring is attached to the stud bolt, the intrusion of moisture from the outside to the concrete inner wall side can be blocked by the water stop ring near the outer wall.

Further, the inner peripheral surface of the water stop ring is welded to the outer peripheral surface of the bolt by the welding heat of the stud bolt to the main steel member, so that these fitting gaps are closed and the watertightness is improved. The water blocking effect is ensured.

With these two points, it is possible to reliably prevent water from seeping into the concrete inner wall.

In particular, according to the second and fourth aspects of the present invention, in addition to welding the inner peripheral surface of the water stop ring to the outer peripheral surface of the stud bolt, the ring is connected to the flange portion of the stud bolt and one end surface of the adjustment hardware. (A) the water-blocking action is performed in two steps by the flange and the water-blocking ring, and (b) the close contact between the flange and the water-blocking ring allows the ring to pass through between them. The flow of moisture toward the inner peripheral surface is stopped, and (c) the water stop ring is securely fixed, and the ring may move on the stud bolt due to the pressure during concrete placement (the welded part may come off) As a result, the water blocking effect is further ensured.

Further, according to the structure of the fifth aspect, the water-stop ring expands due to the invading water, and the inner peripheral surface of the ring is more closely adhered to the outer peripheral surface of the stud bolt, so that the welding force of the ring to the stud bolt is particularly reduced. Even if it is not enough, the water blocking effect by the ring works reliably.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

First Embodiment (See FIGS. 1 to 3) FIG. 1 shows a state in which a mold is installed.

The procedure for installing the formwork will be described first.
One end of the stud bolt 12 is welded (spot welding) to the main steel member 11 such as a section steel.

Prior to this welding, a water blocking ring 13 is fitted around the outer periphery of the stud bolt 12 at the middle as shown in the figure.

In this way, as indicated by the dashed arrow in FIG. 2, the welding heat of the bolt 12 is transmitted from the stud bolt 12 to the water-stop ring 13 and the inner peripheral surface of the rubber 13 is melted. By natural cooling, the molten rubber material is solidified on the outer peripheral surface of the stud bolt 12, and the inner peripheral surface of the water stop ring is welded to the outer peripheral surface of the stud bolt.

In FIG. 2, W indicates a welded portion, and A indicated by a bold line indicates the welded portion.

Next, as shown in FIG.
2 is screwed into the adjustment metal fitting 14, and one end of the separator bolt 15 is screwed into the adjustment metal fitting 14. Finally, the concrete form 16 is fixed to the tip of the separator bolt 15.

As described above, since the water stop ring 13 is attached to the stud bolt 12, after the concrete is cast and hardened, the penetration of moisture (indicated by solid arrows in FIG. 2) from the outside into the concrete inner wall side is prevented. The water-blocking ring 13 can cut off near the outer wall.

Furthermore, since the inner peripheral surface of the water blocking ring 13 is welded to the outer peripheral surface of the bolt by the welding heat of the stud bolt 12 to the steel frame main member 11, these fittings are compared with the case of a simple fitting type. The joint gap is closed and the water tightness is markedly increased, so that the above-mentioned water shielding effect is reliably performed.

Therefore, seepage of moisture into the concrete inner wall is reliably prevented.

The rubber material of the water blocking ring 13 may be any material having a property of being melted by heat, and may be a natural rubber or a synthetic rubber.

If rubber (mainly natural rubber) having the property of absorbing water and expanding is used, the waterproof ring 1
3 expands from the state shown by the imaginary line in FIG. 3 to the state shown by the solid line due to the infiltrated water, and the inner peripheral surface of the ring more closely adheres to the outer peripheral surface of the stud bolt. Even if it is sufficient, the water blocking action by the ring 13 works reliably.

Second Embodiment (See FIG. 4) Only differences from the first embodiment will be described.

The water blocking ring 13 is used to increase the water tightness between the outer peripheral surface of the stud bolt 12 and the bolt 12.
Is desirably fitted into the non-threaded portion of the horn.

Therefore, in the second embodiment, the water stop ring 13
Is provided integrally with a circular (or polygonal) flange portion 12a at the boundary between the threaded portion and the non-threaded portion of the stud bolt 12 so that the flange portion is not accidentally fitted into the threaded portion (welding a separate flange member). The stud bolt 12 may be fixed to the outer periphery of the stud bolt 12).
3 is prevented from being fitted into the screw portion.

The flange 12a is provided with a stud bolt 12
Also functions as a stopper that regulates the screwing allowance of the adjustment hardware 14 with respect to.

Third Embodiment (See FIG. 5) In the third embodiment, a flange 12a is formed at the boundary between the threaded portion and the non-threaded portion of the stud bolt 12 as in the second embodiment.
The water stopping ring 13 fitted on the tip side (screw portion) of the flange 12a is connected to the flange 12a and one end surface of the adjustment hardware 14 by the screwing force of the adjustment hardware 14 on the bolt 12. It is sandwiched between.

In the case of this configuration, the welding work of the stud bolt 12 to the steel frame main material 11 may be performed before the adjusting hardware 14 is screwed, as in the case of the first embodiment. It may be carried out in a screwed state.

According to the third embodiment, in addition to the welding force, (a) the water blocking action is performed in two steps by the flange 12a and the water blocking ring 13.

(B) Since the flange portion 12a and the water blocking ring 13 are in close contact with each other, the flow of moisture passing between them and toward the inner peripheral surface of the ring is stopped.

(C) The water stop ring 13 is a stud bolt 1
2, the ring 13 moves on the stud bolt 12 due to pressure or the like at the time of placing concrete, and there is no danger that the welded portion will come off.

For this reason, the water blocking effect is more reliable than in the first and second embodiments.

In the above embodiment, the water blocking ring 13 is provided only on the stud bolt 12, but the water blocking ring may be attached to the separator bolt 15 in the same simple fitting type as in the prior art.

[0042]

As described above, according to the present invention, since the water stop ring is attached to the stud bolt, the intrusion of moisture from the outside into the concrete inner wall side is blocked by the water stop ring near the outer wall. Can be.

Further, since the inner peripheral surface of the water blocking ring is welded to the outer peripheral surface of the bolt by the welding heat of the stud bolt to the main steel member, these fitting gaps are closed to improve the watertightness. Thus, the above-mentioned water shielding effect is reliably performed.

With these two points, it is possible to reliably prevent the seepage of water into the concrete inner wall.

In particular, according to the second and fourth aspects of the present invention, in addition to welding the inner peripheral surface of the water stop ring to the outer peripheral surface of the stud bolt, the ring is connected to the flange portion of the stud bolt and one end surface of the adjustment hardware. , The water shielding effect is further enhanced, and the effect of preventing the seepage of water is further enhanced.

Further, according to the fifth aspect of the present invention, since the water stop ring expands due to the intruded water, and the inner peripheral surface of the ring is more closely adhered to the outer peripheral surface of the stud bolt, the welding force of the ring to the stud bolt is particularly reduced. Even if it is not enough, the water blocking effect by the ring works reliably.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a first embodiment of the present invention, in a state where a mold is installed.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is an enlarged sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG. 2 showing a third embodiment of the present invention.

FIG. 6 is a diagram corresponding to FIG. 1 for explaining a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Steel main material 12 Stud bolt W Welded part of stud bolt to steel main material 13 Waterproof ring A Welded part of waterproof ring to stud bolt 14 Adjustment hardware 15 Separator bolt 16 Formwork 12a Stud bolt flange

Claims (5)

(57) [Claims] 1. A concrete formwork in which a stud bolt is welded to a main steel member, an adjusting hardware is screwed into the stud bolt, and a separator bolt is screwed into the adjusting hardware, and a concrete formwork is fixed to a tip of the separator bolt. In the method, the stud bolt is welded to the main steel member with the rubber waterproof ring fitted in the stud bolt, and the welding heat causes the inner peripheral surface of the waterproof ring to be welded to the outer peripheral surface of the stud bolt. A method of installing a concrete formwork, characterized in that: 2. The method for installing a concrete formwork according to claim 1, wherein a flange portion is provided on an outer periphery of the stud bolt, and a water stop ring is sandwiched between the flange portion and one end surface of the adjustment hardware. How to install concrete formwork. 3. A stud bolt having one end welded to a main steel member, an adjustment hardware screwed into the other end of the stud bolt, and a separator bolt screwed into the adjustment hardware. In the concrete formwork installation device for fixing the formwork to the portion, the concrete formwork is provided with a ring-shaped water-stop ring that is fitted into the stud bolt and whose inner peripheral surface is welded to the outer peripheral surface of the bolt by welding heat of the bolt. Characteristic concrete formwork installation device. 4. The concrete formwork installation apparatus according to claim 3, wherein a flange portion is provided on an outer periphery of the stud bolt so as to sandwich a water stop ring between the stud bolt and one end surface of the adjustment hardware. Formwork installation equipment. 5. The water-stop ring is made of a rubber material that expands by absorbing moisture.
Or a concrete formwork installation device according to 4.