JPH0141795B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming a through hole in a concrete structure, and in particular, to a method for forming a through hole in a concrete structure, in particular, a through sleeve is placed in a formwork in advance, concrete is poured, and the through sleeve is buried in the concrete structure. Therefore, an attempt is made to provide a method for forming a through hole in which concrete does not flow into the through sleeve and the through hole has a good finish.

Conventionally, when a through-hole is formed by burying a through-sleeve during concrete pouring, both ends of the through-sleeve are closed with iron plates to prevent concrete from flowing in. As a result, concrete tends to flow into the interior through the gap between the through sleeve and the iron plate, resulting in a dirty, imprecise, and unsightly finish of the through hole.

For this reason, currently, after concrete is poured, it is necessary to cut and remove concrete pieces that have flowed into the through sleeve and hardened, or to repair the area around the end face of the through sleeve, which results in a lot of waste during construction, and improvements are desired.

Therefore, in this invention, we have developed a method that eliminates the drawbacks of the conventional construction methods described above, completely prevents concrete from flowing into the penetration sleeve, reduces the effort required to modify the end face of the penetration sleeve, and streamlines the construction process. was developed,
Its structure has an outer diameter that is the same as or slightly larger than the inner diameter of the small openings at both ends of the penetrating sleeve to be buried in the concrete structure, a through hole for the separator shaft is formed in the center, and an annular recess is formed on the inner surface. The tip of the lid for closing the mouth made of elastic material,
Fit the formwork into the small openings at both ends of the through-sleeve and attach it so that it abuts the fitted lids at both ends of the through-sleeve, and tighten the formwork with the separator installed by inserting the through-hole in the lid, and insert the lid into the through-sleeve. It is characterized in that it is inserted a predetermined amount to close the openings at both ends of the through-sleeve, and then concrete is poured into the formwork.

Next, embodiments of the present invention will be illustrated below with reference to the drawings.

1 is a penetration sleeve, which is made of a steel pipe or a paper tube (sonoboid), etc., and is buried in the beam or wall of the concrete structure C to form a penetration hole, and its cross-sectional shape may be circular, square, or other. In some cases, the shape is irregular.

Reference numeral 2 denotes a lid for closing the opening of the penetrating sleeve 1, which is made of an elastic material such as synthetic resin foam or synthetic rubber that can be elastically deformed, and has a diameter that is the same as or slightly larger than the inner diameter of the opening of the penetrating sleeve 1. It is formed into a plate shape with a large outer diameter, and the outer diameter of the lid 2 is approximately 2 mm larger than the inner diameter of the small opening of the penetrating sleeve 1, and the thickness of the lid 2 is approximately 30 mm. However, other modifications can be made as appropriate depending on the diameter and shape of the penetrating sleeve 1.

A tapered part 20 for fitting consisting of a chamfer, a taper, a radius, etc. is formed on the outer periphery of the lid 2 on the side that fits into the through sleeve 1, so that it can be easily fitted into the edge of the through sleeve 1. ing. Furthermore, if a large number of grooves 21 are formed on the entire outer periphery of the lid 2, the outer periphery of the lid 2 will easily deform when it is fitted into the through sleeve 1, and it will be possible to easily accommodate errors and variations in the inner diameter of the sleeve. . It should be noted that if the groove 21 is formed into a tapered groove that becomes larger from the outer surface of the penetrating sleeve 1 to the inner surface when it is inserted, the insertion will be made easier (see Fig. 3). reference).

In addition, a through hole 22 is formed in the center of the lid 2 through which the shaft of the separator 3 can be inserted.
When the lid 2 is inserted into the penetrating sleeve 1, it is formed into a tapered shape that becomes narrower from the inner surface to the outer surface to facilitate the insertion of the separator shaft 30 and to improve the adhesion with the shaft 30. It's doing well.

Furthermore, a portion of the inner surface of the lid 2 excluding the outer periphery and the periphery of the through hole 22 is hollowed out in a circular shape to form a concave portion 2.
3 (see Figure 2).

The lids 2 for closing the edges as described above are fitted into both ends of the penetrating sleeve 1 and installed in the formwork for pouring concrete.To explain the construction process in detail, first, After the construction is completed, the penetration sleeve 1, which has been cut in advance according to the width of the concrete beam C, etc., is set in a predetermined position by inserting it into the hole of the steel beam M, and further reinforcing the penetration sleeve 1. Carry out reinforcement work, etc.

Next, the tapered fitting portion 20 formed at the tip of the end closing lid 2 is lightly fitted into both ends of the through sleeve 1 to the extent that it will not fall off, thereby temporarily closing the end of the through sleeve 1. Thereafter, a formwork 4 for pouring concrete is erected so as to be in contact with the outer surface of the lid 2, and the formwork 4 is tightened. Formwork 4
When installing the separator 3 used for tightening and holding, the separator shaft 30 can be inserted through the through hole 22 of the lid 2, so that the formwork 4 on both sides of the penetrating sleeve 1 can be inserted.
can be tightened with the separator 3.

By tightening the formwork 4 with the separator 3, the lids 2 on both sides are pushed into the through sleeve 1 and are tightly fitted without any gaps.
This means that the inner surface and the lid 2 can be brought into close contact with each other without any gaps. In addition, when the formwork 4 is tightened until it comes into contact with the end surface of the penetrating sleeve 1 and the lid 2 is completely fitted into the penetrating sleeve 1 (see the right end part in Fig. 1), the end surface of the penetrating sleeve 1 and the mold It is also possible to leave a slight gap between the inner surface of the frame 4 (first
(See the left end part). In this way, the end surface of the penetrating sleeve 1 is not exposed to the outside even when the through hole is formed after concrete is poured. The distance between the end face of the penetrating sleeve 1 and the inner surface of the formwork 4 can be set from a minimum of 0 mm to a maximum of about 20 mm. Even if the formwork 4 and the through-sleeve 1 are not in close contact with each other as described above, the lid 2 and the through-sleeve 1 and the lid 2 and the inner surface of the formwork 4 are in close contact with each other without any gaps, so that concrete can completely flow in. can be prevented.

Then, concrete is poured in this state, and after the concrete has solidified, the formwork 4 and separator 3 are removed, and the lid 2 is removed from the penetration sleeve 1, thereby forming a through hole in the concrete structure C. Regarding the removal of the lid 2, if the lid 2 is not to be reused, it can be cut and removed.In this case, the lid 2 may be made of a synthetic resin foam that is inexpensive and easy to cut. It is preferable to leave it there. Further, when removing the lid 2 from the penetrating sleeve 1, it is convenient to hook the lid 2 into the through hole 22 at the center and pull it out.

According to the method of the present invention configured as described above, the openings at both ends of the penetrating sleeve 1 can be completely closed with the lid 2 made of an elastic material, and the lid 2 can be brought into close contact with the inner surface of the mold 4. Therefore, the occurrence of gaps, which were a problem in the past, is completely prevented, and there is no need for repair work around the through-hole after concrete is poured.

In particular, since the lid 2 is fitted into the through-sleeve 1 by tightening the mold 4, the work of fitting the lid 2 is simple and reliable, and the adhesion between the lid 2 and the inner surface of the mold 4 is also improved. This is very good and can further prevent the occurrence of gaps.

Furthermore, since a through hole 22 for inserting the separator shaft 30 is formed in the center of the lid 2, the through sleeve 1
The formwork 4 on both sides can be securely and securely tightened directly with the separator 3, and there is no need to worry about gaps forming between the formwork 4 and the through-sleeve 1 or lid 2 due to the pouring pressure during concrete pouring. It is very convenient as there is no need for it.

Moreover, since the lid 2 itself can be made of an elastic material such as synthetic resin foam, which is much lighter and cheaper than conventional iron plates, the construction cost is low and the work is easy. Additionally, an annular recess 23 is provided on the inner surface of the lid 2.
Therefore, when the lid 2 is inserted into or removed from the through-sleeve 1 at this recessed part 23, the lid 2 is
It not only makes it easier to deform the outer periphery, but also saves material by stealing meat. Further, the deformability of the lid 2 made of an elastic body has excellent flexibility to absorb manufacturing errors and dimensional variations of the penetrating sleeve 1, and can greatly contribute to simplifying and speeding up construction.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is a sectional view, FIG. 2 is a sectional view of a main part when the lid is fitted, and FIG. 3 is a perspective view of a modified example of the lid. DESCRIPTION OF SYMBOLS 1... Penetration sleeve, 2... Lid, 20... Tapered part, 22... Through hole, 3... Separator, 30...
...Separator shaft, 4...Formwork, C...Concrete structure, M...Steel frame.

Claims (1)

[Claims] 1. A penetrating sleeve to be buried in a concrete structure, which has an outer diameter that is the same as or slightly larger than the inner diameter of the small openings at both ends, has a through hole for the separator shaft in the center, and has an annular recess on the inner surface. The tips of the end-closing lids made of an elastic body formed with . Tighten with the installed separator,
A method for forming a through-hole in a concrete structure, comprising the steps of: inserting a predetermined amount of the lid into the through-sleeve to close the openings at both ends of the through-sleeve; and then pouring concrete into a formwork. 2. A method for forming a through-hole in a concrete structure according to claim 1, using an edge-closing lid in which the separator shaft through-hole is formed in a tapered shape so as to become larger toward the tip side of the lid. 3. A method for forming a through-hole in a concrete structure according to claim 1, using an edge-closing lid having a tapered end formed at its tip.