JP2001182319A - Expansible sleeve and its holding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to hold a sleeve used for passing through electric wiring, water service pipe, piping for gas pipe and piping for air conditioning equipment or boring a through-hole into beam, wall, slab or the like for ventilation or the like to the form without using any adhesive when a concrete structure is constructed and to realize an expansible sleeve facilitating expansion control and its holding method. SOLUTION: A cover section 7 with a center hole 8 is provided to the front end of a cylinder 6 capable of inserting the end of the sleeve 1, caps 4 and 5 formed on a spiral slope are provided to the other end 9, and the side wall of the sleeve 1 inserting the end in the caps 4 and 5 is the expansible sleeve formed by fixing secrews 2, 3 and, etc., coming into contact with the spiral slopes 9 and 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial application] When constructing concrete structures, beams, walls, and slabs are used for electric wiring, water pipes and gas pipes, air conditioning equipment pipes, ventilation, etc. It is necessary to make a through hole in such as. Although a paper sleeve called a void is used to form the through-hole, the present invention has an elastic structure and allows the sleeve to be easily installed.

[0002]

2. Description of the Related Art To make a sleeve inserted between molds facing each other into an expandable structure is disclosed in
No. -152897, JP-A-8-333895, and registered utility model No. 3043839.

[0003] In particular, the elastic sleeve disclosed in Japanese Patent Application Laid-Open No. 11-152897 has a flange at the tip of a cylindrical portion inserted into both ends of the sleeve, and a cylindrical mounting base is formed from both ends of the sleeve. The part is pulled out, the brim part is pressed against the mold, and the structure is fixed to the mold with an adhesive layer on the outer surface of the brim.

[0004]

Therefore, although this structure is also substantially a stretchable structure, it becomes possible only when an adhesive layer is provided on the outer surface of the brim portion. In addition, the mold is usually used repeatedly, but since the brim portion and the mold are bonded, not only is it difficult to disassemble, but also traces of the adhesive layer remain, making it difficult to reuse. .

The technical object of the present invention is to provide a stretchable sleeve which can be held in a mold without using an adhesive and which can be easily expanded and contracted, and a method of holding the stretchable sleeve. is there.

[0006]

The technical problem of the present invention is solved by the following means. A first aspect of the present invention is a cap for a stretchable sleeve, which has a lid with a center hole at the tip of a cylinder into which the end of the sleeve can be inserted, and the other end of which has a helical slope.

As described above, the cap for the elastic sleeve according to the present invention has the lid with the center hole at the tip of the cylinder into which the end of the sleeve can be inserted, and the other end is formed in a spiral inclination. So, using this cap,
It can be used as an elastic sleeve simply by inserting both ends of a normal sleeve and hitting a screw or the like that comes into contact with the spiral inclination.

That is, the cap and the sleeve are relatively rotated in the direction in which the screw climbs in the spiral inclination while the both ends of the sleeve are inserted in the cap and the mold is inserted between the opposing molds. Then, in a state where the cap is pushed and stretched, the cap and the sleeve are fixed by hitting a fixing screw, whereby both ends of the elastic sleeve can be held by the mold.

According to a second aspect of the present invention, the end of the sleeve into which the end of the sleeve can be inserted has a lid with a center hole at the end, and the other end has a cap formed with a helical inclination. On the side wall of the sleeve inserted into the cap,
An elastic sleeve to which a screw or the like abutting on the spiral inclination is fixed.

[0010] As described above, the cap having the structure as defined in claim 1 is provided, while the screw or the like abutting on the spiral inclination is fixed to the side wall of the sleeve. The cap and the sleeve are inserted in the direction in which the screw climbs the helical slope in a state where the bolt is inserted into the bolt hole and the center hole of the mold frame and inserted between the mold frames facing each other. Is relatively rotated, and the cap is pushed out and stretched, and the cap and the sleeve are fixed by hitting a stop screw, whereby both ends of the elastic sleeve can be held by the mold.

According to a third aspect of the present invention, the end of the cylinder into which the end of the sleeve can be inserted has a lid with a center hole, and the other end has a cap formed with a spiral inclination. On the side wall of the sleeve inserted into the cap,
An elastic sleeve to which a screw or the like abutting on the spiral inclination is fixed is used.

Then, with both ends of the sleeve inserted into the cap, insert the sleeve between the opposing molds, and then insert bolts into the bolt holes of both molds and the center holes of the caps at both ends. After the insertion, the cap and the sleeve are relatively rotated in a direction in which the screw or the like climbs the helical inclination, and the cap is pushed and stretched, and a fixing screw is hit on the cap and the sleeve and fixed. Thereby, both ends of the elastic sleeve are held by the mold.

[0013] In this way, with both ends of the sleeve inserted into the cap having the structure as claimed in claim 1, the sleeve is inserted between the opposing molds so that the cap and the cap are inclined in the direction in which the screw climbs. According to the method in which the sleeve is relatively rotated and the cap is pushed and stretched, and the cap and the sleeve are fixed by hitting a set screw, both ends of the elastic sleeve can be securely molded without using an adhesive. It can be held in a frame.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a stretchable sleeve according to the present invention. FIG. 1 is an exploded perspective view showing an embodiment of a stretchable sleeve according to the present invention.

Reference numeral 1 denotes a sleeve, which is conventionally called a "void". Screws 2 and 3 are provided on both side walls of the sleeve 1. Not only screws,
You may hit nails or pins.

Reference numerals 4 and 5 denote caps. Caps 4 and 5
Are just the opposite, the structure is exactly the same and therefore use the same.

The caps 4 and 5 have a cylindrical portion 6 having an inside diameter such that both ends of the sleeve 1 can just fit therein.
And a lid 7 integrated with the outer end of the cover. The outer diameter of the lid portion 7 is larger than the outer diameter of the cylindrical portion 6 and a structure protruding in a brim shape is suitable. A center hole 8 for passing a bolt is formed in the center of the lid 7.

The inner end of the cylindrical portion 6, that is, the end 9 on the side opposite to the lid 7 (on the side of the sleeve 1) is inclined. That is, it has a spiral inclination. Since the vehicle is inclined over just one round, there is a step like 93 between the lowest slope 91 and the highest slope 92.

FIG. 2 is a sectional view for explaining a method of using the elastic sleeve of FIG. 1, and illustrates a case where a beam is constructed. 10 is a beam bottom formwork, 11 and 12 are beam side formwork, 13, 1
4 is a floor slab formwork.

Inside such formwork 10, 11, 12, stirrup 17 is wound around upper and lower beam main reinforcements 15, 15 and abdominal muscle 16 and fixed.

In the case of the present invention, in the state where the reinforcing members are arranged in the beam form as described above, the inside of the form is inserted between the reinforcing bars while caps 4 and 5 are put on both ends of the sleeve 1 of FIG. Insert

Then, after the elastic sleeve is arranged at the positions of the bolt holes 18 and 19 previously opened in the beam-side molds 11 and 12, the bolt holes 18 of the one-side mold 11 → the one lid 7 are formed.
Center hole 8 → inside the sleeve 1 → center hole 8 of the other lid 7 → bolt hole 19 of the other mold 12
0 is inserted.

With the left and right caps 4 and 5 and the sleeve 1 thus supported by the bolts 20, the caps 4 and 5 on both sides are rotated relative to the sleeve 1 to extend the elastic sleeve.

FIG. 3 is an enlarged side view of a mounting portion of the elastic sleeve, and the side molds 11 and 12 are shown in a sectional view. With the bolts 20 inserted as described above, the screws 2, 3 are in contact with the helical slopes 9, 9 of the left and right caps 4, 5, and the helical slopes 9, 9 are The caps 4 and 5 and the sleeve 1 are relatively rotated in the direction in which 3 climbs.

That is, while holding the sleeve 1 with one hand, the left cap 4 is rotated in the direction of arrow a1 (to the right toward the left side frame 11), and the right cap 5 is rotated.
Is rotated in the direction of arrow a2 (to the left toward the left side mold 11).

When the relative rotation is made in this manner, the left cap 4 is pushed to the left (in the direction of arrow a3) by the screw 2 and extends. The right cap 5 is pushed rightward (in the direction of arrow a4) by the screw 3 and extends. In this way, the left and right caps 4, 5 extend toward the left and right side molds 11, 12 and come into contact with the left and right side molds 11, 12.

Thus, the lids 7 of the left and right caps 4, 5
In a state where 7 is in contact with the left and right side molds 11 and 12, for example, 21,
When a screw is hit at the position 22, the cylindrical portion 6 of the left cap 4 and the sleeve 1 are fixed with the screw, and similarly, the cylindrical portion 6 of the right cap 5 and the sleeve 1 are fixed with the screw.

As a result, the caps 7, 7 of the left and right caps 4, 5 are held by the frictional force between the left and right side frames 11, 12, but when the nut 23 at the tip of the bolt 20 is tightened, The elastic sleeve is firmly fixed between the left and right side frames 11 and 12.

As shown by arrows a5 and a6, nails or screws are slanted from the left and right lids 7 and 7 toward the left and right side mold frames 11 and 12 so that the lids 7 and 7 and the side molds are joined. The frames 11 and 12 can be fixed. Alternatively, as shown by arrows a7 and a8, the lids 7 and 7 are provided from outside the left and right side molds 11 and 12.
You may hit a nail or a screw toward.

When the screws 2 and 3 are relatively rotated in the direction of climbing the spiral slope 9, there is a possibility that the screws 2 and 3 may move over the spiral slope 92 and the step 93 to the slope lower 91 side. In some cases, another screw may be re-punched at the position of the lower part of the slope, such as 2a, before it comes off, and it can be further extended by relatively rotating it.

When screws are screwed at the positions 21 and 22 to fix the cylindrical portion 6 of the caps 4 and 5 to the sleeve 1, for example, 21 and 22 of the cylindrical portions 6 and 6 can be easily screwed.
If a hole is made in advance at the 22 position, screwing can be performed from the hole. Not only screws but also nails and tacks can be used.

The caps 4 and 5 and the sleeve 1 can be sold in a state where a sleeve 1 of a predetermined length is prepared and the screws 2 and 3 are hit in advance.
It is also possible to purchase only the caps 4 and 5, cut the long sleeve into a predetermined length at the site, and hit the screws 2 and 3 for use.

In the above embodiment, the material of the sleeve 1 is not particularly limited, but usually, a void made of paper is often used. Further, the lid 7 and the cylindrical portion 6 of the caps 4 and 5 are made of metal or synthetic resin, and are preferably integrally molded.

It should be noted that the spiral cap 9 of the cylindrical portion 6 can be reversed in the direction of the cap 4 on the left side and the cap 5 on the right side. Need to be done, which increases costs.

[0035]

According to the first aspect of the present invention, a cap for an elastic sleeve according to the present invention has a lid with a center hole at the tip of a cylinder into which the end of the sleeve can be inserted, and the other end has a spiral shape. The cap can be used as an elastic sleeve simply by purchasing this cap, inserting both ends of a normal sleeve, and hitting a screw or the like that comes into contact with the spiral slope.

That is, the cap and the sleeve are relatively rotated in the direction in which the screw climbs in the spiral inclination with both ends of the sleeve inserted into the cap and inserted between the facing molds. Then, in a state where the cap is pushed and stretched, the cap and the sleeve are fixed by hitting a fixing screw, whereby both ends of the elastic sleeve can be held by the mold.

According to a second aspect of the present invention, a cap having the same structure as that of the first aspect is provided. On the other hand, a screw or the like abutting on the helical inclination is fixed to the sleeve side in advance. Into the cap, inserted between the molds facing each other, in a state where the bolt is inserted through the bolt hole and the center hole of the mold, the cap in the direction in which the screw climbs the spiral slope. With the sleeve relatively rotated and the cap pushed and stretched, the cap and the sleeve are fixed with hitting screws to press the lids of the caps at both ends of the elastic sleeve against the formwork and hold it. Can be done.

According to a third aspect of the present invention, both ends of the sleeve are inserted into the cap having the same structure as in the first aspect, and the sleeve is inserted between the facing molds so that the screw is inclined in the direction in which the screw climbs. According to the method in which the cap and the sleeve are relatively rotated and the cap is stretched and the cap and the sleeve are fixed by hitting a fixing screw on the cap and the sleeve, even without using an adhesive, the elastic sleeve can be reliably used. Both ends can be pressed and held against the mold.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a stretchable sleeve according to the present invention.

FIG. 2 is a cross-sectional view illustrating a method of using the elastic sleeve of FIG.

FIG. 3 is an enlarged side view of a mounting portion of the elastic sleeve, and a side mold is shown in a cross-sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sleeve 2, 3 Screw 4, 5 Cap 6 Cylindrical part 7 Lid 8 Center hole 9 Spiral inclination 11, 12 Beam side formwork 18, 19 Bolt insertion hole 20 Bolt 21, 22 Position where fixed screw is hit

Claims (3)

[Claims] 1. A cap for an elastic sleeve, wherein the end of the cylinder into which the end of the sleeve can be inserted has a lid with a center hole, and the other end is formed in a helical slope. . 2. A cylinder into which the end of the sleeve can be inserted has a lid with a center hole at the tip, and the other end has a cap formed with a helical slope, and the end is attached to the cap. A stretchable sleeve characterized by fixing a screw or the like in contact with the spiral inclination to a side wall of the inserted sleeve. . 3. A cylindrical portion into which the end of the sleeve can be inserted has a lid with a center hole at the tip, and the other end has a cap formed with a spiral inclination, and the end is attached to the cap. A screw or the like abutting on the spiral inclination is fixed to a side wall of the sleeve to be inserted.In a state where both ends of the sleeve are inserted into the cap, the sleeve is inserted between mutually facing molds. Then, after inserting bolts into the bolt holes of both the formwork and the center holes of the caps at both ends, the cap and the sleeve are relatively rotated in the direction in which the screw or the like climbs the helical inclination, and the cap is rotated. A stretchable sleeve holding method, wherein a fixing screw is hit on the cap and the sleeve in a stretched state.