JPH0362864B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a sleeve for a through hole in a concrete structure.

(Prior Art) Conventionally, when providing a through hole in a beam for passing wiring and piping inside a concrete structure, a paper cylinder has been used.

(Problem to be solved by the invention) In order to provide through-holes for wiring and piping, reinforcing bars have already been set in the beams, so these reinforcing bars are surrounded by a temporary frame and a sleeve is installed before concrete is poured. However, in the case of paper tube sleeves, the long items are cut to size on site. The paper tube must be cut slightly shorter than the width of the beam, otherwise the paper tube will not fit between the reinforcing bars as it is inserted diagonally. However, if it is installed horizontally, there will inevitably be a gap between the temporary frame and the paper tube sleeve, and when the temporary frame is removed after pouring concrete, the through hole will flow through the gap and burrs will form in the concrete. It takes time and effort to remove, and there is a risk of damage. Also, since it has to be inserted between narrow reinforcing bars, the cylinder is crushed and inserted, but since there is no bend line, the cylinder cannot be folded properly in the same direction as the axis, so it is time consuming and difficult to return to its original cylindrical shape. difficult. In addition, the paper cylinder must be removed after concrete is poured, which is highly impractical during construction.

(Means for Solving the Problems) The present invention has been made in order to solve the above problems.

A single metal plate (surface treated for rust prevention is more durable.Hereinafter referred to as metal plate) is provided with multiple bending lines 2 in the same direction as the axis, and An outer cylinder main body 1 is provided with a length adjusting part 9 at one or more places, and engagement grooves 3 and 4 are provided at the left and right side ends to engage with each other to form a cylinder, and the outer cylinder Like the main body 1, it is made of a single metal plate, has a plurality of bending lines 12 in the same direction as the axis, and has an adjusting part 19 that can be locked with the length adjusting part 9 provided on the outer cylinder main body 1. Engagement grooves 13 and 14 provided at one or more locations and engaged at both left and right ends to form a cylindrical body.
The inner cylinder main body 11 is connected to the outer cylinder main body 1 by being slidably inserted into the outer cylinder main body 1. Since it is made of a metal plate, it is manufactured by press working. Naturally, it is also possible to mold the material from synthetic resin instead.
It does not go beyond the scope of this invention.

(Function) Bend the bending line 2 of the outer cylinder main body 1 outward, spread it out with the inside facing up, and stack the inner cylinder main body 11 on top of it by bending the bending line 12 outward like the outer cylinder main body 1, as shown in the fourth figure. Either the outer cylinder body 1 and the inner cylinder body 11 are rolled together from one end as shown in FIG. Insert the outer cylinder body 1 into the narrow space where the reinforcing bars are assembled while it is folded flat, and insert the outer cylinder body 1 at the position where the through hole is provided.
Open the inner cylinder body 11 to a nearly cylindrical position,
First, engage the engagement grooves 13 and 14 on both left and right ends of the inner cylinder main body 11, and then connect the length adjustment part 9 of the outer cylinder main body 1 with the adjustment part 19 of the inner cylinder main body 11. They are matched, and the engagement grooves 3 and 4 at both left and right ends are engaged to form a cylindrical body.

The outer cylinder main body 1 and the inner cylinder main body 11 connected in this way are slid and brought into close contact with the temporary frame in accordance with the width of the temporary frame.

(Example) An example of the present invention will be described with reference to the drawings.
Reference numeral 1 denotes an outer cylinder main body made of a single metal plate, provided with a plurality of bending lines 2 in the same direction as the axis, and provided with a length adjustment part 9; , one side is a vertical surface 9a as shown in FIG.
The other side has a concave shape with a gently sloped surface 9b. The left and right ends of the outer cylinder main body 1 are provided with engaging grooves 3 and 4 that are convex when viewed from the front side in order to overlap the left and right ends to form a cylindrical shape. A tongue-shaped locking part 5 is formed in the groove 3 by punching, and the other engagement groove 4 is provided with a cut 6a into which the tongue-shaped locking part 5 can be inserted. A hole locking portion 6 is formed.

Reference numeral 7 denotes a flange provided at one end of the outer cylinder main body 1, and a notch 7a is formed at the bending line 2.

Reference numeral 8 denotes a rib protruding from the front side, which is provided at an appropriate location around the outer cylinder main body 1 to hold the cylinder (cylindrical in the drawing) so as not to be deformed by the weight of concrete. The shape of is not limited as long as it is ring-shaped or any other shape that can hold the cylindrical body. If it is provided in only one place, it is better to place it as close to the opposite end of the flange 7 as possible.

Reference numeral 10 denotes a gasket attached to the flange 7, and is pasted with adhesive or the like.
The material of the packing 10 is often polyethylene foam sponge, but it is not limited to this material, and any material with elasticity, adhesion, etc. may be selected as appropriate.

Like the outer cylinder main body 1, 11 is made of a single metal plate, and has a plurality of bending lines 12 in the same direction as the axis, and is engaged with the adjustment part 9 provided on the outer cylinder main body 1. The inner cylinder main body has a convex adjustment part 19 that can be adjusted, and can be slidably connected to the outer cylinder main body 1.

The left and right ends of the inner cylinder main body 11 are provided with engaging grooves 13 and 14, respectively, which are concave when viewed from the front in order to overlap the left and right ends to form a cylindrical shape. A tongue-shaped locking portion 15 is formed by punching, and a locking portion 16 of an insertion hole into which the tongue-shaped locking portion 15 is inserted is formed in the other engagement groove 14. There is.

Reference numeral 17 denotes a flange provided at one end of the inner cylinder main body 11, and a notch 17a is formed at the bending line 12.

Reference numeral 18 is a rib that is provided at one or more appropriate locations around the inner cylinder main body 11 and has a concave shape when viewed from the front side, and the shape of this rib 18 is not limited. This rib 18 also has the same function and effect as the rib 8 of the outer cylinder main body 1.

Reference numeral 20 denotes a gasket attached to the flange 17, and is pasted with adhesive or the like.

Providing this packing completely prevents concrete from flowing in. Patsukin 10 and 2
Applying adhesive to the outer surface of the 0 and pasting release paper will also increase construction efficiency. Furthermore, if the flanges 7 and 17 are provided with nail holes 7b and 17b, they can be nailed to the temporary frame.

The flanges of the outer cylinder main body 1 and the inner cylinder main body 11 have the purpose of fixing and adhering to the surface of the temporary frame, but they also have an element for holding the cylindrical shape.

The above is the configuration of this embodiment, and the manner of engagement of the engagement grooves is as follows:
It is inserted into the locking part 16 of the insertion hole provided in the insertion hole, the engaging grooves are overlapped and engaged, and then the locking part 16 is pushed down and locked. Next, the tongue-shaped locking portion 5 provided in one engagement groove 3 of the outer cylinder body 1 on the outside of the inner cylinder body 11 is connected to the insertion hole provided in the other engagement groove 4. It is inserted through the cut 6a of the part 6, the engaging grooves are overlapped and engaged, and then the locking part 5 is folded down and locked.

In this case, since the inner cylinder main body 11 forms a complete cylinder, the left and right ends of the outer cylinder main body 1, which is wrapped around the inner cylinder main body 1 from the outside, are engaged by the convex engagement grooves. The engagement groove 4 that overlaps the engagement groove 3 has elasticity and dimensions that allow it to easily go over the lower engagement groove 3, so it can be inserted from above the slightly raised tongue-shaped locking part 5. There is not enough room, so a cut 6a is provided in the insertion hole of the locking part 6, and the tongue-shaped locking part 5 is inserted from the side through this cut 6a.

Although the outer cylinder main body and the inner cylinder main body are shown as cylindrical bodies in the drawings, they may be elliptical cylinders, polygonal cylinders, or the like.

(Effects) (a) The outer and inner cylinder bodies are made of a single metal plate and have multiple bending lines, making them small and easy to fold flat, even in narrow spaces with reinforcing bars. Easy to put in and set up.

(b) Since the outer cylinder body and the inner cylinder body are slidably (extendable) connected by the length adjustment part, it is easy to insert it when it is shortened, and it is possible to freely adjust it to the size of the temporary frame by stretching it. , prevents concrete from flowing in by adhering tightly, does not block the through holes, and does not require the work of removing burrs.

(c) After pouring, in the case of a paper tube, it must be removed, but in the present invention, it is not necessary to remove it.

(d) When using reinforcing metal fittings for perforated beams provided at both ends of the sleeve, they can be attached to the sleeve of the present invention with a band or the like.

[Brief explanation of drawings]

FIG. 1 is a perspective view of one embodiment of the present invention. Figure 2 is a developed view of the outer cylinder body. Figure 3 is a developed view of the inner cylinder body. FIG. 4 is a perspective view of the same, with the inner cylinder main bodies stacked and folded. FIG. 5 is an enlarged sectional view of an example of the length adjustment section. 1 is the outer cylinder body, 2 is a bending line, 3 and 4 are engagement grooves, 5 and 6 are locking parts, 7 is a flange, 8 is a rib,
7a is a notch, 7b is a nail hole, 9 is an adjustment portion, 1
0 is a packing, 11 is an inner cylinder body, 12 is a bending line, 13 and 14 are engagement grooves, 15 and 16 are locking parts,
17 is a flange, 17a is a notch, 17b is a nail hole, 18 is a rib, 19 is an adjustment portion, and 20 is a packing.

Claims (1)

[Claims] 1. A plurality of bending lines are provided in the same direction as the axis, and a length adjusting portion is provided at one or more predetermined locations, and engagement grooves are provided at both left and right ends to engage to form a cylindrical body. The outer cylinder body is provided with a plurality of bending lines in the same direction as the axis, and an adjustment part that can be locked with the length adjustment part provided on the outer cylinder body is provided at one or more places, and the left and right sides are provided. Both ends are respectively provided with engagement grooves that engage to form a cylinder, and the inner cylinder main body is slidably inserted into and connected to the outer cylinder main body,
A sleeve for a through hole in a concrete structure, in which an inner cylinder body is stacked on the inside of the outer cylinder body, and the bending lines are bent together.