JPH0577445U - Concrete outflow prevention tool - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] The gap between the pillar member made of a thin precast plate and the floor surface can be easily and reliably closed regardless of the size of the pillar member, and is reusable. Provide a concrete leak prevention tool. A concrete outflow prevention tool (3) for preventing concrete from flowing out from a gap between a lower end of a column member made of a thin precast plate and a floor surface, wherein the concrete outflow prevention device (3) is at least on each side of the column member. A square tubular fixing member 4 fixed to the floor at one end and abutting the lower end of the pillar member, and slidably accommodated in the fixing member 4,
And a sliding member 5 having a slit-shaped opening in the longitudinal direction
And a concrete outflow prevention, which is attached to an opening 7 formed in the fixing member 4 and has a tip through which a tip is inserted into a slit-like opening of the sliding member 5 through the opening 7. Ingredient

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention prevents concrete from flowing out from the gap between the lower end of the PC column member and the floor surface when concrete is placed in the inner space of the column member made of a thin precast plate (hereinafter referred to as PC column member). The present invention relates to a concrete outflow prevention tool.

[0002]

[Prior Art]

 In recent years, when constructing a pillar of a building, a precast hollow PC pillar member is erected at a predetermined position, and concrete is poured into the internal space of this PC pillar member to integrate it with the PC pillar member. A method of constructing a pillar as the structural material has been proposed and put into practical use (for example, Japanese Patent Application Laid-Open Nos. 2-194226 and 2-167960).

When a pillar is constructed using the above PC pillar member, a level adjustment of the PC pillar member erected on the floor surface normally adjusts the distance between the lower end of the PC pillar member and the floor surface by 20 to 30 mm. A gap is formed. Therefore, in the above construction method, it is important to close the gap so that concrete does not flow out when the concrete is poured into the internal space of the PC pillar member. Conventionally, in order to close the gap, a method has been adopted in which square timber (hereinafter referred to as lumber) cut into a predetermined length is brought into contact with the outer peripheral wall at the lower end of the PC pillar member and fixed to the floor surface with concrete nails. ing.

[0004]

[Problems to be solved by the device]

 However, the dimensions (cross-sectional area) of the PC pillar members are determined by the supporting load of the floor structure, so in high-rise buildings, the dimensions of the PC pillar members are designed to decrease gradually toward the upper floors. It Also, if the building structure is different, the dimensions of the PC pillar member will naturally be different. Conventionally, workers cut to the optimum length according to the dimensions of PC pillar members on-site, but the work of loading a large amount of timber to the construction site, the work of dimensioning PC pillar members and the cutting of timber. Is a dangerous task in a narrow field. In particular, due to the recent shortage of workers, the aging of workers engaged in the above work is progressing, and there is a demand for rationalization and labor saving of the work.

On the other hand, since the timber used to prevent concrete from leaking from the PC pillar member cannot be applied to other PC pillar materials, the timber used once is discarded without being reused. There is. However, there have been criticisms both inside and outside Japan regarding the application of square timber to prevent concrete runoff from the viewpoint of effective use of resources or forest protection, and there is an urgent need to develop concrete runoff prevention technology that does not use timber. ing.

Therefore, an object of the present invention is to use concrete material for the gap between the lower end of the PC pillar member and the floor surface, and to prevent concrete from flowing out regardless of the size of the PC pillar member, and to perform it safely. It is an object of the present invention to provide a concrete outflow preventive device capable of surely closing the gap. Another object of the present invention is to provide a concrete outflow preventive tool that can be reused without being discarded once used.

[0007]

[Means for Solving the Problems]

 The inventors of the present invention have noticed that the above problems can be solved by using a member that is slidable so as to match the dimensions of the PC column member, and have further studied and arrived at the present invention.

That is, the present invention is a concrete outflow prevention device for preventing concrete outflow by closing a gap between a lower end of a column member made of a thin precast plate and a floor surface, and the concrete outflow prevention device is provided with a pillar. A rectangular tubular fixing member fixed to the floor surface so as to abut the lower end outer wall of at least one side of each side of the member, and slidably accommodated in the fixing member and long. And a pin that is attached to the opening formed in the fixing member and has a tip portion inserted into the slit-shaped opening of the sliding member through the opening. The concrete outflow prevention device is characterized in that it is composed of.

[0009]

[Action]

 The concrete outflow prevention device for a PC pillar member of the present invention can be installed easily because the concrete outflow prevention device can be arranged along the length of one side of the PC pillar member by adjusting the length of the sliding member. Also, it can be removed after the completion of construction and reused for the next construction.

[0010]

【Example】

 Next, an embodiment of a concrete outflow prevention tool for a PC pillar member of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the relationship between the PC pillar member 1 and the floor surface L. The PC pillar member 1 configured as a hollow rectangular cross-section is the floor surface at the position where it is carried into the site and a pillar is to be constructed. It is erected on the level adjusting bolt 2 embedded in L. The level adjusting bolts 2 adjust the level of the PC pillar member. After the level adjustment, a gap S of 20 to 30 mm is usually formed between the lower end of the PC pillar member 1 and the floor surface L. Then, the concrete outflow prevention tool 3 for closing the gap S between the PC pillar member and the floor surface is fixed by a concrete nail 15 to the entire circumference of the lower end of the PC pillar member.

FIG. 2 is a plan view of the concrete outflow prevention tool 3, and FIG. 3 is a sectional view. As shown in FIG. 2, a sliding member 5 having the same cross-sectional shape as the fixing member 4 is housed in a pair of rectangular tubular fixing members 4. A slit-shaped opening 6 is formed in the sliding member in the longitudinal direction, and the sliding member 5 is detached from the fixed member 4 through the opening formed in the fixed member 4 in the slit-shaped opening 6. The pin 7 for preventing the above is inserted. As shown in FIG. 4, the structure 7 of the pin is such that discs 11 and 12 having a width larger than the width of the slit-shaped opening are integrally provided on both sides of a small diameter portion 10 which is inserted into the slit-shaped opening. Both ends of the disk body are cut off so that the body 12 has a width smaller than the width of the slit-shaped opening. Reference numeral 13 is a groove for mounting a tool provided on the surface of the upper disc body 11.

As shown in FIG. 3, the bottom wall of the fixing member 4 is provided longer than the bottom wall of the rectangular tube. An opening 16 for driving a concrete nail into the long portion to fix the fixing member to the floor surface is formed. Normally, the rectangular tubular fixing member 4 preferably has a triangular shape shown in FIGS. 2 and 3, but a square shape, a hexagonal shape, or the like may be adopted. Further, it is preferable that the cross section having a height of 30 to 80 mm is an isosceles triangle. The length is usually 250 to 500 mm and can be appropriately determined according to the dimensions of the PC column member. Although FIG. 2 shows an example in which both ends of the sliding member 5 are supported by the fixing members 4, one end of the sliding member 5 is supported by the fixing members 4 in the case of a PC pillar member having a small cross-sectional size. It doesn't matter.

The concrete outflow prevention tool 3 of the present invention is made by extrusion molding using a resin having excellent weather resistance and impact resistance, for example, hard vinyl chloride or the like, or metal such as aluminum or iron, and can be manufactured in large quantities at low cost. It can be manufactured. It can also be manufactured by welding or the like.

Next, a method of using the concrete outflow prevention tool 3 of the present invention will be described. First, as shown in FIG. 1, when the PC pillar member 1 is erected on the floor surface L and the level is adjusted by the level adjusting bolt 2, the outflow prevention tool 3 in which the sliding member is housed in the rectangular tubular fixing member is installed. It is arranged at the lower end of the PC pillar member 1. Next, after extending the sliding member 5 so that the outflow prevention tool 3 substantially matches the length of one side of the PC pillar member 1, the fixing member 4 is brought into contact with the outer wall of the lower end of the PC pillar member to fix the fixing member 4. The concrete nail 15 is driven into the floor surface through the opening 16 formed in the bottom wall of No. 4 and fixed to the floor surface L.

In this way, the outflow prevention tool 3 is fixed to the entire circumference of the PC pillar member 1. In this state, as shown in FIG. 5, a gap is formed between the PC column member 1 and the sliding member 5 by the thickness of the rectangular tubular body forming the fixing member. Therefore, a filling material 14 such as putty or a foamed sheet is embedded in this gap to close the gap. When the gap S between the lower end of the PC pillar member and the floor surface L is completely closed by the concrete outflow preventing tool 3 in this way, concrete is next poured into the internal space of the PC pillar member. After the concrete poured into the internal space of the PC pillar member hardens, the concrete outflow prevention tool 3 removed from the floor surface removes the pin 7 and pulls out the sliding member 5 from the fixing member 4 to separate it. If the fixing member 4 and the sliding member 5 are washed, they can be used again as a concrete outflow prevention tool.

[0016]

[Effect of the device]

 As described above, the concrete outflow prevention device for a PC pillar member of the present invention can be installed easily because the concrete outflow prevention device can be along one side of the PC pillar member by adjusting the length of the sliding member. Moreover, when the pin is removed after the completion of construction, it has an excellent effect that it can be easily separated into a fixed member and a sliding member for cleaning and reuse.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a concrete outflow prevention tool.

FIG. 2 is a plan view of a concrete outflow prevention tool.

FIG. 3 is a cross-sectional view of a concrete outflow prevention tool.

FIG. 4 is a perspective view of a slip-out prevention pin of a sliding member.

FIG. 5 is a plan view showing a usage state of the concrete outflow prevention tool.

[Explanation of symbols]

 1 PC pillar member 2 Level adjusting bolt 3 Concrete outflow prevention tool 4 Fixing member 5 Sliding member 6 Slit-shaped opening 7 Opening 8 pins

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Etsunori Tamura 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Creator Ritsuo Matsumura 2-3 Kandajimachi, Chiyoda-ku, Tokyo Obayashi Tokyo Main Office

Claims (1)

[Scope of utility model registration request] 1. A concrete outflow preventing tool for preventing concrete from flowing out by closing a gap between a lower end of a pillar member made of a thin precast plate and a floor surface, the concrete outflow preventing tool being provided on each side of the pillar member. A square tubular fixing member that is fixed to the floor surface at least at one end and is in contact with the lower end outer wall of the pillar member, and is slidably accommodated in the fixing member and has a slit-shaped opening in the longitudinal direction. And a pin attached to an opening formed in the fixed member and having a tip portion inserted through the opening into the slit-shaped opening of the sliding member. A concrete outflow prevention tool.