JPH019882Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a head processing plug for formwork tension bolts, and more specifically, the present invention relates to a head treatment plug for formwork tension bolts, and more specifically, for removing wooden cones or plastic cones attached to the ends of formwork tension bolts in the framework of concrete structures. This relates to a processing plug that fills the hole after removal.

Generally, in constructing the frame of a concrete structure, bolts are placed across the concrete pouring space in order to maintain tension between opposing forms that partition the space. A truncated cone-shaped wooden cone or plastic cone is screwed and fixed to each end of this bolt within the concrete pouring space,
By bringing the bottom surface (large diameter circular surface side) of this cone into close contact with the inner surface of the formwork, and making the threaded portion protruding from the bottom surface protrude outward from the hole in the formwork, a nut is screwed into this threaded portion and tightened. The bolts and the formwork are connected to each other to position the formwork in a predetermined position.

This wooden or plastic cone is removed from the bolt (which is embedded in the concrete) together with the formwork after the concrete has been poured. Therefore, after the formwork of a concrete structure is removed, a truncated conical hole from which the end of the formwork tension bolt protrudes remains on the surface of the frame of the concrete structure.

Conventionally, such a hole is closed with a plug of the same shape that is fitted and inserted into the hole. No.) Those disclosed in the official gazette are known. The recess plug for concrete structures described in Utility Model Application Publication No. 80440 of 1983 has a bottomed hole for accommodating the end of the bolt at the center of the upper part of the truncated cone. It is characterized in that a through hole is bored on the axial center line of the recess between the bottom of the hole and the large-diameter bottom surface of the truncated cone. When this conventional recess closure plug is fitted into a recess formed by removal of a wooden cone or plastic cone from a building frame, an adhesive consisting of cement filler powder and a reinforcing agent is applied to the insertion side of the closure plug, i.e. The adhesive is placed on the side of the bottomed hole, and then inserted and fitted into the recess. At this time, the adhesive that has entered the bottomed hole is pushed into the bottom of the bottomed hole by the end of the bolt. The air was exhausted to the outside through the through holes, and at the same time, the through holes were also filled with adhesive.

However, in reality, when such a conventional recess plug is fitted and inserted into a recess in the rear body filled with adhesive, the adhesive that has entered the through hole from the bottomed hole is absorbed into the bolt end. There was a problem in that air was discharged from the plug and did not remain in the through hole due to the rapid exhaust of air due to the relative pushing pressure into the bottom hole.

Next, as another conventional example, for example,
There is a leak prevention valve shown in No. 37856.

This has protrusions circumferentially provided on the side surfaces of a truncated cone, and several vertical grooves are formed on the inner surface of a bottomed hole formed in the center of the upper part of the cone. However, in such a configuration, the air flow in the above-mentioned exhaust gas flows through the vertical groove of the side wall of the bottomed hole, once inside the recess of the concrete structure, and then around the outer surface of the conical body to the outside. Therefore, not only does the evacuation path become longer, but the amount of evacuation depends on the cross-sectional area of the vertical groove, and as a result, inconveniences due to insufficient evacuation are unavoidable.

Therefore, the object of the present invention is to provide a treatment plug for filling a hole at the end of a formwork tension bolt formed on the surface of a concrete structure, and to provide a treatment plug that fills the hole at the end of a formwork tension bolt formed on the surface of a concrete structure. To provide a head treatment plug for a formwork tension bolt capable of exhausting internal air without leaving an unfilled portion of adhesive inside the treatment plug.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the head treatment plug for formwork tension bolts of the present invention will be described in more detail with reference to preferred embodiments shown in the accompanying drawings.

Figure 1 shows a truncated cone-shaped wooden cone or plastic cone that was attached to the end of a formwork tension bolt embedded in concrete and connected to the formwork in a concrete structure, and is removed together with the formwork. The basic structure of the state is shown.

That is, the frame surface 10 of the concrete structure
A hole 11 in the shape of a truncated cone is formed in the hole 11 where the wooden cone or plastic cone was removed.
In the center of the hole 11 protrudes an end 14 of a formwork tension bolt 13 embedded in the concrete 12.

FIGS. 2 to 4 show the surface 10 of the skeleton.
An embodiment of a head treatment plug for a formwork tension bolt according to the present invention, which is embedded in a hole 11 formed in a hole 11, is generally designated by the reference numeral 15. This formwork tension bolt head processing plug (hereinafter simply referred to as processing plug or plug) 1
5 has a similar truncated conical shape, although slightly smaller in size, to fit into the hole 11 in the surface 10 of the body, and is molded from cement or organic material.

This plug 15 has a recess 17 in the center of a small-diameter circular surface 16, which is the upper part thereof, which is bored inward in the axial direction of the plug. This recess 17 corresponds to the plug 15
It has an inner diameter and depth suitable for accommodating the end portion 14 of the formwork tension bolt 13 when it is stuffed into the hole 11 of the frame surface 10 from the upper side. Furthermore, this plug 15 has a peripheral wall 1 extending radially from the top thereof.
A vertically divided groove 19 cut across 8 is formed. This longitudinal groove 19 is therefore cut across the recess 17 formed in the center of the upper part of the plug 15, and is thus cut into two straight lines in the radial half of the plug. They can also be considered as vertically divided grooves 19a and 19b. As is clear from FIGS. 3 and 4, the depth of the cut of these vertical grooves 19a and 19b extends to the bottom surface 20 of the recess 17, and the bottom of the vertical groove 19 is flat and flush with the bottom surface of the recess 17. It's on the surface. However, the bottom shape of the vertical groove 19 should not be limited to this embodiment, and as is clear from other embodiments shown in FIG.
The portion 21 located on the peripheral wall of the recess 17 is the bottom surface 20 of the recess 17.
It is sufficient if it is formed to be on the same horizontal plane as or lower than that, that is, on the lower large-diameter circular surface 22 side. Therefore, as long as the bottom of the vertical groove 19 is formed in this way, the bottom of the vertical groove 19 is the fourth
It is not necessary to make it continuous with the bottom surface 20 of the recess 17 as in the embodiments shown in FIGS. 1 and 5, and there may be a step.

Further, in the plug 15 according to the present invention, the fifth
As in the other embodiment shown in the figures, the cut flute 19 from the top can be cut from the recess 17 into the circumferential wall 18 of the plug without completely traversing the entire plug as in the embodiment shown in FIG. It is also possible to form only one longitudinal groove leading to the surface.

The plug 15 constructed as described above is filled with an adhesive made by kneading cement filler powder and a reinforcing agent in approximately half of its upper portion, and is sufficiently filled into the recess. This plug is then connected to the sixth
As shown in the figure, the holes 11 in the main body surface 10 are stuffed. As a result, the formwork tension bolt 13 is relatively pushed into the recess 17 of the plug 15.
The adhesive in the recess is compressed by the end 14 of the adhesive and simultaneously pushed outward through the longitudinal groove 19;
The air in the recess is then exhausted to the outside through the longitudinal grooves 19 by the adhesive forced out through the longitudinal grooves. Then, the adhesive pushed out through the vertical grooves and the adhesive applied to the upper and upper peripheral walls fill the slight gap between the peripheral wall of the plug 15 and the hole 11, as shown in FIG. Then, the plug 15 is completely and tightly fitted into the hole 11 on the surface of the body.

As described above, the processing plug 15 of the present invention has a vertically divided groove 19 cut from the upper part 16 between the bolt end receiving recess 17 bored in the center of the upper part and the peripheral side surface.
By forming this, when the air remaining in the recess 17 is pushed by the adhesive and exhausted, the exhaust air is not concentrated in one point, so no large back pressure is applied, and therefore the air is exhausted extremely smoothly and the exhaust air is The vertically divided grooves subjected to the process are also completely filled with the adhesive that is extruded out or enters from the peripheral wall, and there are parts that are not filled with adhesive inside this processing plug and in the gap with the hole 11. Never.

As described above, according to the head treatment plug for formwork tension bolts of the present invention, the vertically divided grooves of the peripheral wall reach the bottom of the bottomed hole, so that the air flow during the exhaust is improved. For example, there is no air encirclement as in the second conventional example mentioned above,
Inconveniences caused by insufficient exhaust can be resolved. As a result, the holes left after removal of the wooden cone or plastic cone on the surface of the body can be easily closed without forming any space inside, resulting in excellent strength and waterproof effects.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the end of a formwork tension bolt in a concrete structure after the formwork has been removed, and Fig. 2 shows an embodiment of the head processing plug of the formwork tension bolt of the present invention. A plan view, FIG. 3 is a right side view of the processing plug shown in FIG. 2, and FIG.
5 is a cross-sectional view similar to FIG. 4 showing another embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along the line, and FIG. It is a partial cross-sectional view of the frame showing the state where the wood cone is packed into the hole where the wood cone was removed. 11...hole, 13...formwork tension bolt, 14...
... Bolt end, 15 ... Formwork tension bolt head processing plug, 16 ... Upper part, 17 ... Recess, 19 ... Vertical groove.

Claims (1)

[Scope of utility model registration request] It consists of a truncated cone made of cement or organic material and has a recess in the center of the upper part, extending from the upper surface of the truncated cone to the bottom of the recess,
A head treatment plug for a formwork tension bolt, characterized in that at least one vertical groove is formed to vertically divide a part of the peripheral wall surrounding the recess.