JPS5814907B2 - Embedded fixture for formwork tightening - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a formwork clamping method which is used for tightening and fixing the separator and formwork by screwing onto the end of a separator laid between formworks for pouring concrete in concrete pouring work. Regarding the embedded fixture for attachment, in detail, it has a partition wall in the center of the inner surface, and the peripheral surface of the H-beam steel has screw holes for inserting the separator and the pivot metal screws from the left and right ends, respectively, toward the partition wall. It is molded into a mortar shape using synthetic resin, and then one or two types of inorganic materials such as a cellulose derivative material and alumina cement, bentonite, silica sand, or aluminum oxide powder are added to the synthetic rubber or synthetic resin emulsion on the molded resin. The present invention relates to an embedded fixture for clamping a formwork, which is coated with an emulsion mixture obtained by adding the above ingredients to produce a large amount of emulsion hydrate.

BACKGROUND ART Conventionally, in concrete pouring work, a predetermined number of separators have been fixed at the location where concrete is to be poured, and are used to maintain the strength of the concrete when it is buried.

This separator is fixed at the end of the separator using wood, iron, or P-con (molded plastic).
etc. are screwed in, and the wooden or P-container, formwork, and bag-like nuts are tightened and fixed with the pivot metal.

After concrete is poured, this wood concrete, iron concrete, and P
Currently, the concrete is removed and then filled with mortar, resin-containing mortar, etc.

However, it takes time and effort to remove and bury the wood, iron, P-con, etc., and no matter how carefully this method is carried out, the outer surface of the wood, iron, P-con, etc. may be wood, iron, or synthetic. Because they are made of resin, water leaks from the interface between these concrete and the concrete, and we are struggling to find a solution.

In addition, there are methods of attaching a plastic condenser when assembling the formwork and pouring concrete so that the plastic condenser is not removed later. There are special methods for attaching plastic concrete coated with concrete, but either method may cause gaps at the interface between the poured concrete and wood concrete, steel concrete, P concrete, etc., or dry shrinkage of the concrete that cannot be seen with the naked eye. Possible rupture occurs,
It is not possible to completely prevent water leakage from this part.

Therefore, as a result of studies to improve the poor adhesion between the concrete frame and the concrete as described above, and to eliminate water leakage through the concrete and the damage caused by it, the inventors of the present invention have synthesized the area around the H-shaped steel (iron ring) into a mortar shape. By using a concrete molded with resin and coated with a special synthetic resin emulsion mixture as an embedded fixture for tightening the formwork, gaps or breaks occur at the outer peripheral interface between the concrete and the fixture, causing water to leak out. Even if water intrudes, the synthetic resin emulsion coating formed on the peripheral surface of the fixing device absorbs moisture, swells, and precipitates waterproof gel, etc., which can prevent water from entering. We discovered that it has synergistic functions such as being able to prevent the intrusion of water directly flowing into the concrete, as well as having good adhesion to concrete, and developed a completely leak-proof formwork tightening fixing system. He invented the tool.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embedded fixture for tightening formwork according to the present invention will be described below with reference to the drawings showing one embodiment thereof.

The embedded fixture A for tightening formwork of the present invention has the shape shown in the perspective view of FIG.
As is clear from the longitudinal sectional view of the construction example in the figure, there is a partition wall 3 at the center of the inner surface, and screw holes 2 for inserting the separator B and the pivot metal C are drilled from the left and right ends of the partition wall 3, respectively. The periphery of the installed H-shaped steel 1 is molded into a mortar shape with a synthetic resin 4, and the molded resin 4 is further coated with a synthetic resin emulsion mixture layer 5.

However, when using the embedded fixture A for tightening the formwork as a lever, both ends of the separator B, which is embedded at a predetermined interval in the concrete pouring part, are drilled into the inner surface of the mortar-shaped bottom (rib surface) of the fixture A. It is screwed into the screw hole 2 for separator screw insertion, and the other end is tightened with a cap nut 8 using the shaft metal C to fix the formwork 9.

(Fig. 3) The outer peripheral surface of the H-shaped steel 1 used in the fixture A of the present invention, which corresponds to the inner partition wall 3, is made into a recess 6 when the H-shaped steel 1 is molded with synthetic resin. This is to prevent demolding from the H-shaped steel and water leakage by incorporating synthetic resin into the steel.

Therefore, in order to achieve this purpose, in addition to the above-mentioned recess, one end of the H-shaped steel as shown in FIG. 4 may be shaped into an open leg 7.

In addition, the external shape of the H-shaped steel itself can be circular or polygonal, but when covering the outer periphery with synthetic resin,
From the viewpoint of preventing demolding and rotation as described above, a polygonal shape as shown in a perspective view in FIG. 5 is more convenient.

When the fixing device of the present invention is used to screw both ends of the separator B and the formwork is tightened, as shown in the figure, a washer-type cap 10 is placed on the outside except for the center screw hole for inserting the shaft metal screw. All you have to do is fit it in and secure the formwork with the pivot metal from above.

After pouring concrete, remove the bag nuts and axle foot metal, remove the formwork, and if the screw hole of the fixture from which the axle foot metal was removed is in a position where it is filled with earth and sand, replace the washer type cap 10. The wedge-shaped cap 11 may be driven into the screw hole of the fixing device from which the axle foot metal is removed while still attached, and then the screw hole may be filled with earth and sand.

In addition, after pouring concrete, remove the pivot metal and formwork as described above, but if the screw hole of the fixing tool from which the pivot metal was removed is in a position where waterproofing of the upper outer wall is required from the ground of the building, the screw hole is removed. The mold cap 10 is also removed, a wedge-shaped cap 11 is driven into the screw hole, and after that, a general exterior putty is applied to the externally exposed surface of the fixture, and then the exterior wall surface is finished with an exterior material.

In short, the present invention is an embedding fixing device for screwing and tightening a separator used in concrete pouring work, which has perfect adhesion to the concrete and at the same time prevents residual moisture in the concrete and permeated moisture from reaching the metal surface of the H-shaped steel. To prevent it from rusting when touched, or from penetrating into the gap between the molded synthetic resin and the concrete and seeping into the exterior walls, we mold a special synthetic resin emulsion mixture that blends well with the concrete and also traps moisture. This coats the top surface of the synthetic resin.

That is, in the present invention, a material having a very high water absorption rate when dried into a film, such as synthetic rubber or ethylene-vinyl acetate emulsion, is used as a binder, and a cellulose material, alumina cement, bentonite, silica sand, or aluminum oxide powder is used as a binder. A coating film of an emulsion mixture that can produce a large amount of emulsion hydrate by adding inorganic substances such as silica is formed on the peripheral surface of a synthetic resin molded into a mortar shape.

Specifically, we focused on the unique characteristic of synthetic rubber and synthetic resin emulsion films that they swell and breathe when exposed to water, and at the time of creating this emulsion film,
A waterproof film is formed on the surface of the synthetic resin molded into a mortar by using admixtures such as alumina cement and bentonite, which have high water absorption and water retention properties. bin hole)
Even if moisture seeps into the concrete and reaches the film, the breathing action of the flexible, breathable synthetic rubber or synthetic resin coating that surrounds the particles of admixtures such as alumina cement and bentonite. This causes microfluidization of aluminum, silicon, calcium, etc. contained in the admixture, and they are released from this coating film to form aluminum salts, calcium silicate salts, acetate salts, waterproof gel substances, etc., which can be used to seal damaged areas. This works usefully, and it also prevents moisture from seeping into the H-beam steel from damaged areas of the molded synthetic resin.

In the embedded fixture for tightening the formwork of the present invention, the synthetic resin used to mold the periphery of the H-shaped steel into a mortar shape includes PVC,
Any moldable synthetic resin such as ABS or zircon may be used, but PVC is particularly advantageous in terms of cost and manufacturing.

In addition, the thickness of the synthetic resin emulsion mixture coated on the surface of the synthetic resin molded into a mortar shape is preferably 0.3 to 1.0 mm, and in order to obtain such a thick film, the concentration of the mixture must be approximately 50%. , the viscosity is 10.000-15. 000CPS
It is best to immerse or spray such a highly viscous material.

In the present invention, the base emulsion used for making the emulsion mixture as a waterproof layer is styrene-butadiene rubber, methyl methacrylate-butadiene rubber, nitrile rubber, which has excellent water absorption, water retention, and swelling properties.
Examples include chloroprene rubber, natural rubber, acrylic ester, and ethylene-vinyl acetate copolymer, but ethylene-vinyl acetate copolymer is most suitable as a waterproof layer from the viewpoint of alkali resistance and swelling rate.

In addition, in forming the emulsion film, cellulose derivatives such as hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, and aminoethyl cellulose are used to increase water absorption and water retention efficiency and to form a thick film, and pennite is used to promote water absorption and swelling. Furthermore, alumina cement, silica sand, or aluminum oxide powder is used to increase the drying effect of the film.

The range of use of cellulose derivative substances, inorganic substances, or conductive substances in the emulsion when making the emulsion mixture Yoshishu, which becomes the waterproof coating layer, is as follows:
Cellulose derivative substance 0.1-5 parts by weight, alumina cement 5-100 parts by weight, bentonite 0.1 parts by weight
~5 parts by weight, silica sand or aluminum oxide powder 10-50
Parts by weight.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embedded fixture for tightening a formwork according to the present invention, FIGS. Figure 3 is a partially cutaway longitudinal cross-sectional view showing an example of formwork tightening by inserting a sebarator into the fixture and a metal shaft screw. FIG. 5 is a perspective view and a front view of an example of H-shaped steel. A: Embedded fixture for tightening the formwork, B:...
・Severator, C... Pivot metal, 1...
...H-shaped steel, 2...Screw hole, 3...Partition wall, 4...Molded synthetic resin layer, 5...
Synthetic resin emulsion mixture coating layer.

Claims (1)

[Claims] 1. The peripheral surface of an H-shaped steel having a partition wall at the center of the inner surface and screw holes for inserting the separator and the shaft metal screws being drilled from the left and right ends of the partition wall, respectively, is molded into a mortar shape using synthetic resin; Furthermore, one or more types of inorganic substances such as a cellulose derivative substance and alumina cement, bentonite, silica sand, or aluminum oxide powder are added to the emulsion of synthetic rubber or synthetic resin on the molding resin to form a large amount of emulsion hydrate. An embedded fixture for tightening formwork, which is coated with an emulsion mixture produced by.