JP2551915Y2 - Concrete outflow prevention device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for casting concrete in an internal space of a column member made of a thin precast plate (hereinafter referred to as a PC column member). The present invention relates to a concrete outflow prevention device for preventing outflow of concrete.

[0002]

2. Description of the Related Art In recent years, when a pillar of a building is constructed, a precast hollow PC pillar member is erected at a predetermined position, and concrete is poured into the internal space of the PC pillar member. A construction method of constructing a pillar as a structural material integrated with a pillar member has been proposed and put into practical use (for example, JP-A-2-194226 and JP-A-2-167960).
Issue publication).

When a column is constructed using the above-mentioned PC column member, the level of the PC column member erected on the floor surface is adjusted so that the P column is adjusted.
A gap of usually 20 to 30 mm is formed between the lower end of the C column member and the floor surface. Therefore, in the above-mentioned construction method, it is important to close the gap so that concrete does not flow out when concrete is poured into the internal space of the PC column member. Conventionally, in order to close the gap, a method has been adopted in which square wood (hereinafter referred to as "square material") cut to a predetermined length is brought into contact with the outer peripheral wall at the lower end of the PC column member and fixed to the floor with concrete nails. I have.

[0004]

However, the dimensions (cross-sectional area) of the PC column members are determined by the supporting load of the floor structure.
It is designed so that the dimension of the C column member is gradually reduced. Also, if the building structure is different, the dimension of the PC column member is naturally different. In the past, workers cut to the optimum length at the site according to the dimensions of the PC column members.However, the work to carry a large amount of timber to the construction site, the dimensioning work for the PC column members and the cutting work of the timber are It is dangerous work in a small site. In particular, due to the recent shortage of workers, workers engaged in the above work are aging, and there is a demand for rationalization and labor saving of the work.

[0005] On the other hand, since the timber used to prevent the concrete from flowing out of the PC column member cannot be applied to other PC column members, the used timber is discarded without being reused. However, there has been some criticism in Japan and abroad regarding the use of timber to prevent concrete spillage in terms of effective use of resources and forest protection.
There is an urgent need to develop concrete prevention technology that does not use square timber.

Accordingly, an object of the present invention is to use a gap between the lower end of the PC column member and the floor surface without using a timber, and to easily perform concrete outflow prevention work regardless of the dimensions of the PC column member.
It is an object of the present invention to provide a concrete outflow prevention tool which can be performed safely and can surely close the gap. Another object of the present invention is to provide a concrete outflow prevention device that can be reused without being discarded even once used.

[0007]

The inventors of the present invention focused on the fact that the above-mentioned problems could be solved by using a member slidable so as to match the dimensions of the PC column member. It has been reached.

The present invention is directed to a concrete outflow prevention device for closing a gap between a lower end of a column member made of a thin precast plate and a floor surface to prevent concrete from flowing out. A rectangular tubular fixing member fixed to the floor surface at least at one end of each side of the member and abutting against a lower end outer wall of the column member, and slidably housed in the fixing member; A sliding member having a slit-shaped opening formed in the direction and a pin which is attached to the opening formed in the fixing member and whose tip is inserted through the slit-shaped opening of the sliding member through the opening. It is a concrete outflow prevention tool characterized by being constituted.

[0009]

The concrete outflow prevention device of the PC column member of the present invention can be mounted along the length of one side of the PC column member by adjusting the length of the sliding member. It is easy and can be removed after construction and reused for the next construction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a concrete column outflow prevention device for PC column members of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a relationship between a PC column member 1 and a floor surface L. The PC column member 1 configured as a hollow rectangular cross section is carried into a site and a floor surface at a position where a column is to be constructed. It is set up on the level adjustment bolt 2 embedded in L. The level of the PC column member is adjusted by the level adjusting bolt 2. After the level adjustment, the distance between the lower end of the ordinary PC column member 1 and the floor L is 20 to 3
A gap S of 0 mm is formed. Then, the concrete outflow preventer 3 for closing the gap S between the PC column member and the floor surface is fixed around the entire lower end of the PC column member by concrete nails 15.

FIG. 2 is a plan view of the concrete outflow preventing device 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 cylindrical fixing members 4. The sliding member is provided with a slit-shaped opening 6 in the longitudinal direction, and the sliding member 5 is detached from the fixing member 4 through the opening formed in the fixing member 4 in the slit-shaped opening 6. A pin 7 is inserted to prevent the occurrence of the above. As shown in FIG. 4, the pin structure 7 is such that discs 11 and 12 larger than the width of the slit-shaped opening are integrally provided on both sides of a small-diameter portion 10 inserted into the slit-shaped opening. Numeral 12 has both ends of the disk cut off so as to have a width smaller than the width of the slit-shaped opening. Numeral 13 is a groove for mounting a gear along the surface of the upper disk 11.

The bottom wall of the fixing member 4 is provided longer than the bottom wall of the rectangular tube as shown in FIG. An opening 16 for driving a concrete nail into the long portion to fix the fixing member to the floor surface is formed. Usually, the rectangular tubular fixing member 4 is preferably used in a triangular shape as shown in FIGS. 2 and 3, but a quadrangular shape, a hexagonal shape, or the like may be adopted. Further, the dimensions thereof are preferably such that the cross section having a height of 30 to 80 mm is an isosceles triangle. Length is usually 250-500
mm, which can be appropriately determined by the dimensions of the PC column member. FIG. 2 shows an example in which both ends of the sliding member 5 are supported by the fixing member 4. However, in the case of a PC column member having a small sectional dimension, one end of the sliding member 5 is supported by the fixing member 4. No problem.

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

Next, the method of using the concrete outflow prevention device 3 of the present invention will be described. First, as shown in FIG.
When the column member 1 is erected on the floor surface L and the level is adjusted with the level adjusting bolts 2, the outflow prevention tool 3 in which the sliding member is accommodated in the rectangular tubular fixing member is arranged at the lower end of the PC column member 1. I do.
Next, after extending the sliding member 5 so that the outflow prevention member 3 substantially matches the length of one side of the PC column member 1, the fixing member 4 is
The concrete nail 15 is driven into the floor surface through an opening 16 formed in the bottom wall of the fixing member 4 while being in contact with the outer wall at the lower end of the C column member, and is fixed to the floor surface L.

In this way, the outflow prevention member 3 is fixed to the entire periphery of the PC column 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 for the thickness of the rectangular tubular body forming the fixing member. Therefore, a filler 14 such as a putty or a foam sheet is buried in the gap to close the gap. When the gap S between the lower end of the PC column member and the floor surface L is completely closed by the concrete outflow prevention tool 3 in this manner, concrete is then poured into the internal space of the PC column member. After the concrete poured into the internal space of the PC column member has hardened, the concrete outflow prevention tool 3 removed from the floor surface is pulled out of the pin 7 and the sliding member 5 is pulled out of the fixing member 4 to be separated and fixed. When the member 4 and the sliding member 5 are washed, they can be used again as a concrete outflow prevention tool.

[0016]

As described above, the concrete outflow prevention device of the PC column member of the present invention can be mounted along the one side of the PC column member by adjusting the length of the sliding member. The work is easy, and when the pin is removed after the construction is completed, the fixing member and the sliding member can be easily separated and the cleaning and reuse can be performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a use state of a concrete outflow prevention device.

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

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

FIG. 4 is a perspective view of a pin for preventing a sliding member from coming off.

FIG. 5 is a plan view showing a use state of the concrete outflow prevention device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PC column member 2 Level adjustment bolt 3 Concrete outflow prevention tool 4 Fixing member 5 Sliding member 6 Slit opening 7 Opening 8 Pin

Continuing on the front page (72) Inventor Ritsuo Matsumura 2-3, Kandajimachi, Chiyoda-ku, Tokyo Examiner, Obayashi Corporation Tokyo Headquarters Investigator Yukiko Arai

Claims (1)

(57) [Scope of request for utility model registration] 1. A concrete outflow preventing device for closing a gap between a lower end of a column member made of a thin precast plate and a floor surface to prevent concrete from flowing out, wherein the concrete outflow preventing device is provided on each side of the column member. A rectangular tubular fixing member fixed to the floor at least at one end and abutting against a lower end outer wall of the column member; a slit-shaped opening slidably received in the fixing member and extending in the longitudinal direction; And a pin which is attached to an opening formed in the sliding member and the fixed member, and whose distal end is inserted through the slit-shaped opening of the sliding member through the opening. A concrete outflow prevention device characterized by the above-mentioned.