JPS5938608Y2 - Sleeves for through holes in concrete structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a through-hole sleeve for a concrete structure, which is used to provide a through-hole in a concrete structure.

BACKGROUND ART In construction of water supply, drainage, heating and cooling, wiring, etc., which is performed as ancillary work on a concrete structure, a sleeve is required to penetrate the floor, beams, walls, etc. of the concrete structure in advance.

Conventionally, this type of sleeve is a cylindrical pipe made of paper, synthetic resin, metal, etc. that is inserted between concrete forms when assembling the form, but it is not possible to insert the sleeve between reinforcing bars or steel frames assembled vertically and horizontally within the form. In order to pass through the gap, the large diameter sleeve must be inserted between the fixed wires of the formwork, and
Moreover, the installation of the sleeve must be completed within a short period of time after the assembly of reinforcing bars or steel frames, etc. is completed and before the concrete is poured.

However, because these sleeves are structurally attached to the formwork with nails or fastened to reinforcing bars or steel frames with wire, the installation work is extremely complicated.

Therefore, a sleeve has been used, which is made by fitting two pieces of synthetic resin pipe with threads on the wall surface and seven flanges on one end so that they can slide freely on the other end, but the installation is a process before and after. It could not be said that it was necessarily satisfactory, as it had the disadvantage of being too hasty.

The present invention has been devised in view of the above, and an embodiment of the present invention shown in the drawings will be described below. Figure 1 is a perspective view of the proposed product, Figure 2 is a sectional view of the same, and Figure 2 is a sectional view of the same. 3 and 4 respectively show the usage state diagrams of the above, and 1
, 1' are synthetic resin tubes that can be slidably fitted into each other, and 2 is a plurality of strips formed on the circumferential wall of the synthetic resin tube 1 by bending the circumferential wall to form a cross section and running in the longitudinal direction. The ridges are formed at predetermined intervals in the circumferential direction, 3 is a flange provided at each end of the synthetic resin pipe bodies 1 and 1', and 4 has an A-shaped cross section. It is a wavy structure formed on the top of the protrusion 2 that runs in the longitudinal direction with a relatively small amplitude and wavelength, and is used for fixing the fitted synthetic resin pipes 1 and 1'. , 5 is a curtain plate formed at the other end of the synthetic resin tube 1 on the side to be inserted during fitting, and is used for reinforcing the synthetic resin tubes 1 and 1'; Perforations are appropriately formed on the peripheral wall surface of the synthetic resin tube bodies 1, 1 in the longitudinal direction or the helical direction, and are used for removing the sleeve after construction.

As is clear from the above, the present invention is constructed by fitting two pieces of a synthetic resin tube having a flange at one end so as to be slidable at the other end. 3 and 4. Since the structure is such that a plurality of protrusions 2 are formed at predetermined intervals in the circumferential direction by bending the peripheral wall surface to form a cross section and running in the longitudinal direction. As shown in the figure, the degree of fitting is adjusted by sliding the synthetic resin pipes 1, 1, and the sleeve is made to a predetermined length.The sleeve is brought into close contact with the concrete formwork, and the flange 3 is nailed to secure the predetermined position. Concrete is placed therein, and after the concrete has set, the formwork is removed and the flange 30 is pulled out to separate it from the concrete structure and form a through hole.

Therefore, the sleeve for through holes in the concrete structure of the present invention has multiple protrusions running in the longitudinal direction, so that the length of the sleeve can be adjusted and removed instantly, so installation requires a lot of back and forth work. It has been simplified and furthermore, the ridges on the cheekbones and the edge panels of the synthetic resin tubes combine to provide excellent flat strength, which eliminates deformation caused by concrete pouring. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the product, FIG. 2 is a sectional view of the same, and FIGS. 3 and 4 are views of the product in use. i, i'-...Synthetic resin tube body, 2...Protrusions, 3...7 langes, 4... Wave-like structure.

Claims (2)

[Scope of utility model registration request] (1) In a product in which three pieces of a synthetic resin tube having a flange at one end are slidably fitted at the other end, the circumferential wall of the synthetic resin tube is bent to form an A-shaped cross section. A sleeve for a through hole in a concrete structure, which is formed by forming a plurality of protrusions running in the longitudinal direction at predetermined intervals in the circumferential direction. (2) A sleeve for a through-hole in a concrete structure according to claim 1, which has a wavy structure in which the apex of the protruding ridges having an A-shaped cross section runs in the longitudinal direction with a relatively small amplitude and wavelength. .