JPH0131827Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) The present invention relates to a backfilling device for penetrating a structure such as a slab, wall, beam, etc. when piping is installed through the structure.

(Prior Art) Supply/distribution pipes and various other types of piping for structures are installed through structures such as slabs, walls, beams, etc., and the penetrating portions are often backfilled after installation. Generally, backfilling refers to inserting a pipe into a relatively large-diameter through-hole formed in advance in a structure, and then filling the gap between the pipe and the through-hole. For the above-mentioned filling, noncombustible materials such as cement mortar, rock wool, and glass wool are mainly used for the purpose of preventing flames from being transmitted through the gap between the pipe and the through hole in the event of a fire.

To explain conventional backfilling with reference to Figs. 1 and 2, through holes 2' are formed in advance in a slab 1' made of concrete etc. using a mold etc. when pouring concrete. (1st
figure). The diameter of the through hole 2' is usually made considerably larger than the diameter of the pipe 3' in consideration of the centering of the pipe 3' to be installed. After installing the pipe 3' in the through hole 2', attach a splint 4' to the bottom of the slab 1' surrounding the pipe 3' using nails, etc. to close the gap between the pipe 3' and the through hole 2'. A filling material 5' such as mortar or rock wool is filled in.

Figure 2 shows the backfilling of walls and beams 6'. in this case,
The splints 4' must be attached to both the inner and outer sides of the wall and beam 6'.

Splints prevent the filling material from escaping and facilitate construction, but since the installation of such splints (and sometimes their removal after construction is complete) and the filling work are all done on site, they require on-site work. Not only is this process extremely complicated, but it also has the disadvantage of degrading the aesthetic appearance of the slab and wall after the splint is removed.

Recently, backfill tools have been used to save labor in the above-mentioned backfill site work.

In Fig. 3, which shows an example of slab construction, when concrete is poured, a sleeve 7' made of metal, plastic, cardboard, etc. is supported by a support (not shown), and a concrete panel 8' is supported using nails, etc. Install and pour concrete on top. Since the standard thickness of the slab is usually 120 mm or 150 mm, the height of the sleeve 7' is made to be approximately the same. Since the inner diameter of the sleeve is quite large for the sake of centering the pipe 3', it is filled with a filler material 5' such as mortar, rock wool, glass wool, etc. after the pipe 3' is arranged. Note that the concrete panel 8' is removed after the concrete hardens. In this case, the above-mentioned through hole is constituted by the inner diameter of the sleeve.

Although the above-described backfilling using a sleeve requires somewhat less field work than the backfilling of FIGS. 1 and 2, the gap between the pipe and the through hole must still be filled on-site. Particularly in Japan, which is an earthquake-prone country, it is necessary to have piping safely follow the behavior of structures in the event of an earthquake to prevent damage. In other words, the floor height must be 2.6 m, the inter-story displacement must be set to 1/150 to accommodate the safety factor, and the horizontal movement distance between the floors must be 17 mm, but if the building is backfilled with mortar, the piping will be damaged due to vibration.

(Purpose of the invention) This invention was proposed to eliminate the above-mentioned drawbacks, and its purpose is to eliminate the need for backfilling with fillers such as rock wool and glass wool at the site, and to prevent inter-story displacement due to earthquakes, etc. To provide a backfilling tool for a pipe penetrating part that can sufficiently absorb water and leave no noticeable backfill marks.

(Structure of the invention) The above object is a backfilling tool for sealingly arranging piping in a through hole provided in a building structure through a deformable filler, the backfilling tool being , an outer cylinder that is installed inside the structure to form a through hole and has a height that is approximately the same as the thickness of the structure; and an inner diameter that is loosely fitted into the outer cylinder and elastically fits onto the piping. a spiral inner cylinder having a spiral shape; a spiral spring having an outer end connected to the outer cylinder and an inner end connected to the inner cylinder near one end of each of the outer cylinder and the inner cylinder; This is achieved by a pipe penetration backfilling tool comprising a compressively deformable filling material filled between the springs.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

As shown in Figures 4 to 6, the backfilling tool of the present invention includes a cylindrical outer cylinder 1, a spiral inner cylinder 2 loosely fitted into the outer cylinder 1, and a spiral connecting the outer cylinder and the inner cylinder. spring 3
and a compressible filler 4 filled in a compressed form in the space between the outer cylinder, the inner cylinder, and the spiral spring, and is manufactured and assembled in a factory.

The outer cylinder 1 has a height approximately equal to the thickness of a structure 5 such as a concrete floor slab, which will be described later, and is provided with a plurality of mounting brackets 7 having nail holes 6 at its longitudinal edges.

The inner cylinder 2 is made of an elastic material such as spring steel, and has a spiral shape with an inner diameter slightly smaller than the outer diameter of the pipe 8 to be installed. The diameter of both ends in the direction is expanded to form a tapered part 2.
A is formed. Since the inner cylinder is elastic, it can be expanded in diameter and brought into close contact with the pipe 8.

The spiral spring 3 having a plurality of turns has its outer end connected to the outer cylinder 1 and its inner end connected to the inner cylinder 2 by means such as welding. The spiral springs 3 may be installed at the axial ends of the outer cylinder and the inner cylinder as shown in the figure, or at the center, or two spiral springs may be installed in consideration of the stability of the inner cylinder 2. By connecting the inner and outer cylinders with such a spiral spring 3, even if there is misalignment between the backfilling tool and the piping, the inner cylinder 2 can move freely on a horizontal plane to correct the misalignment. .

The filler 4 is a noncombustible material such as rock wool, glass wool, asbestos, perlite, and burquemulite, which can expand during compression filling, that is, has elasticity. 9 is an asbestos sheet that prevents the back surface temperature (back side temperature at the time of fire occurrence) from reaching a dangerous temperature due to heat transfer due to heating of the inner and outer cylinders in the event of a fire, and serves as an enclosure when filling the filler material 4. It also has the effect of

The backfill tool thus formed is placed on the concrete panel 10 at the time of pouring the floor slab 5 at the site, and is temporarily fixed with nails via the mounting bracket 7 at the position where the piping 8 is to be installed. Concrete is placed on the outside of the backfilling tool up to the height of the backfill tool, and when the concrete panel 10 is removed after hardening, a hole of the inner diameter of the inner cylinder 2 is provided in the structure 5. The piping work is completed by pushing the piping 8 into this hole.

When a building has multiple floors, the weight of the long piping 8 is borne by the lowest floor (because the tightening force of the inner tube 2 is not very large). In this case, a tightening band indicated by reference numeral 11 can be provided on the backfilling tool on the upper floor to supplement the tightening force of the inner cylinder.

(Effects of the invention) Since the present invention is configured as described above, there is no need to backfill with filler on site, reducing the number of on-site man-hours, and the spiral spring can sufficiently absorb misalignment and interlayer displacement. It has many benefits such as no backfilling and no noticeable backfill marks.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic diagrams showing a conventional backfilling tool, and Figures 4 to 6 are schematic diagrams showing an embodiment of the present invention, of which Figures 1 and 2 are before and after piping installation. FIG. 6 is a plan view of FIG. 5. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 2... Inner cylinder, 2A... Tapered part of inner cylinder, 3... Spiral spring, 4... Filler, 8... Piping, 11... Tightening band.

Claims (1)

[Claims for Utility Model Registration] 1. A backfilling tool for sealingly arranging piping in a through hole provided in a building structure through a deformable filler, the backfilling tool comprising: An outer cylinder 1 that is installed inside the structure to form a through hole and has a height that is almost the same as the thickness of the structure, and an inner diameter that is loosely fitted into the outer cylinder and elastically fits onto the pipe 8. a spiral inner cylinder 2 having a spiral shape, a spiral spring 3 having an outer end connected to the outer cylinder and an inner end connected to the inner cylinder near one end of the outer cylinder and the inner cylinder, respectively; A backfilling tool for a pipe penetrating part, comprising a compression-deformable filler 4 filled between a cylinder and a spiral spring. 2. The backfill tool according to claim 1, which is a registered utility model, in which at least one end of the inner cylinder is formed with a tapered portion 2A that expands in diameter toward the outside. 3 Tightening band 11 that ties the spiral inner cylinder to the pipe
A backfilling tool according to claim 1 of the utility model registration claim, comprising: