JPH08284408A - Bellows sleeve cap - Google Patents

Abstract

PURPOSE: To eliminate chipping work for a thin wall formed between the surface of a beam and the terminal of an embedded sleeve after a form is disassembled and reduce the number of working man-hours and a construction cost. CONSTITUTION: A cylindrical fitting portion 15 which has both open ends to insert the terminal of a sleeve 13 inside itself is provided at one end of a bellows sleeve cap 11. A bellows-cylindrical expansion/contraction portion 17, expansible/contractible in the axial direction, is extensively provided at the other end of the fitting portion 15 and an annular flange 27 put in contact with the inner face of a form is formed at the other end of the expansion/ contraction portion 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bellows sleeve cap for treating an end of a sleeve inserted into a beam before placing concrete.

[0002]

2. Description of the Related Art In SRC and RC buildings, pipes and ducts are penetrated into the beam, so that before pouring concrete,
A metal or cardboard sleeve is inserted in place. As a general construction procedure of the sleeve, as shown in FIG. 7, according to the beam width, in the case of the metal sleeve 1, the sliding portion 1a is adjusted, and a cardboard sleeve (not shown)
In the case of 1, the sleeve 1 is cut to an appropriate length and the sleeve 1 is inserted into a predetermined position. The length of the sleeve 1 is, as shown in FIG.
The beam width W is shortened by about 5 mm on one side and by about 10 mm in total length. Next, the ring-shaped reinforcing bars 3 are attached to both ends of the sleeve 1.
And the reinforcement bars 3 are tightly connected to the adjacent bar arrangements 5. Then, after closing the open end of the sleeve 1 with the duct tape 7 or a dedicated lid, a mold (not shown) is attached,
I was pouring concrete.

[0003]

However, in the above-mentioned sleeve terminal processing structure, the terminal of the sleeve 1 is arranged inside the formwork by about 5 mm, so that when the concrete is poured, the embedded sleeve terminal is Between the beam surface,
The concrete thin wall 9 shown in FIG. 9 was formed. Therefore, in order to open the sleeve ends, the thin wall 9 had to be removed for each sleeve and the sleeves had to be chipped out one by one. In most cases, this work was carried out at a height of 3 m or more, and had to be performed at two positions on each side of one sleeve. In addition, the gum tape 7 that blocked the terminal had to be removed cleanly, and it was also necessary to clean up the chippings that fell on the entire floor. Therefore, there is a problem that the construction cost increases due to an increase in the number of man-hours and the removal of the chippings. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a bellows sleeve cap that does not require chipping after disassembling the mold, and to reduce the number of working steps and the construction cost.

[0004]

In order to achieve the above object, the bellows sleeve cap according to the present invention has a cylindrical fitting portion which is open at both ends and into which the ends of the sleeve are inserted, and the fitting portion. A bellows-cylindrical expansion / contraction portion extending to the other end of the section and expandable / contractible in the central axis direction; and an annular flange formed at the other end of the expansion / contraction section and abutting on the inner surface of the mold. It is characterized by.

[0005]

[Function] When the bellows sleeve caps are attached to both ends of the sleeve and the flange is brought into contact with the inner surface of the formwork and concrete is poured, after the formwork is dismantled, the flange which is in contact with the inner surface of the formwork is exposed. The end of the sleeve appears in an open state inside the bellows sleeve cap, and a thin wall made of cast concrete is not formed between the embedded sleeve end and the beam surface.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a bellows sleeve cap according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of a bellows sleeve cap according to the present invention,
FIG. 2 is a front view of the bellows sleeve cap according to the present invention. The bellows sleeve cap 11 is made of a flexible resin material. A cylindrical fitting portion 15 into which the end of the sleeve 13 is inserted is formed at one end of the bellows sleeve cap 11, and the fitting sleeve 15 has a central axis coaxial with the fitting portion 15 when fitted. The other end of the fitting portion 15 has a bellows cylindrical expansion / contraction portion 1 having an inner diameter larger than the outer diameter of the sleeve 13.
7 is extended, and the expandable part 17 is expandable and contractable in the central axis direction.

The boundary between the fitting portion 15 and the expansion / contraction portion 17 is a step portion 19.
Therefore, a steel hook 21 is provided inside the stepped portion 19. The hook 21 has a hook-shaped tip, and the fitting portion 15
The sleeve 13 is inserted into the end of the sleeve 13. That is,
The sleeve 13 hooked on the hook 21 is prevented from further insertion.

At the other end of the expansion / contraction part 17, the inner diameter is sleeve 13.
A cylindrical insertion portion 23 that is larger than the outer shape is extended, and when the expansion portion 17 contracts, the insertion portion 23 can insert the relatively close sleeve end together with the hook 21 inside. A small-diameter portion 25 is extended to the other end of the insertion portion 23, and the small-diameter portion 25 has a small outer diameter, which facilitates attachment of reinforcing bars (weblens) and prevents the sleeve diameter from appearing larger than necessary. Have. An annular flange 27 is formed at the other end of the small diameter portion 25, and the flange 27
Is abutted against the inner surface of the form. Further, a nail hole 29 for fixing to the form is formed in the flange 27. The bellows sleeve cap 11 includes a fitting portion 15 and a telescopic portion 1.
7, the insertion portion 23, the small diameter portion 25, and the flange 27 are preferably integrally formed.

A sleeve construction procedure using the bellows sleeve cap 11 thus constructed will be described with reference to FIGS. 3 is a diagram when the sleeve is attached, FIG. 4 is a diagram when the bellows sleeve cap is attached, FIG. 5 is a diagram when the reinforcing bar is attached, and FIG. 6 is a diagram when the separator is attached. First, as shown in FIG. 3, the steel frame 31 containing the sleeve 13
Attach. The sleeve 13 may be attached to the through hole of the steel frame 31 that is attached in advance. Next, as shown in FIG. 4, bellows sleeve caps 11 are attached to both ends of the sleeve 13. For attachment, the sleeve 13 penetrating the fitting portion 15 is fixed with gum tape 33 (see FIG. 1) or the like.

Then, main bars, lateral bars and reinforcing bars are attached. Note that the sleeve reinforcement (such as weblens) is always separated from the sleeve 13 unlike the conventional case. That is, in the structure using the bellows sleeve cap 11, since the expansion and contraction of the bellows sleeve cap 11 is important, the sleeve reinforcing bar 35 should be bound to a vertical streak (horizontal streak) or horizontal streak (not shown) as shown in FIG. Separate from the sleeve 13.

Next, as shown in FIG. 6, the mold 37 is attached, and the separator 39 is attached via the sleeve 13 to the mold 37.
Penetrate both sides of. In this state, concrete is poured and the form 37 is disassembled after the design strength is developed. At this time, the separator 39 is also removed at the same time. Formwork 3
When 7 is removed, the flange 27 that was in contact with the inner surface of the mold 37 is exposed, and the end of the sleeve 13 appears in an open state inside the bellows sleeve cap 11.

As described above, according to the bellows sleeve cap 11 described above, since the flange 27 can be brought into contact with the inner surface of the form 37 to pour concrete, between the embedded sleeve end and the beam surface. The thin wall 9 (see FIG. 9) is not formed. As a result, chiseling work is eliminated, the number of man-hours required for work can be reduced, and it is not necessary to dispose of the chipper, and construction costs can be significantly reduced.

Since the expansion / contraction part 17 is expanded / contracted, the length of the sleeve 13 is 100 to 200 from the inner surface of the mold 37.
The length can be shortened by about mm, and the length accuracy of the sleeve 13 can be made gentle. As a result, the sleeve 13 having a fixed size can be commonly used, and the conventional slide mechanism or the cutting work on site is unnecessary.

Further, since both ends of the sleeve 13 can be brought into contact with the mold 37 via the bellows sleeve cap 11, a separator 39 used for holding and reinforcing the mold 37 can be penetrated into the sleeve 13. Will be able to.

In the above-described embodiment, the step portion 19 is provided with the hook 21 and the hook 21 is hooked to the end of the sleeve 13 to prevent the sleeve 13 from being inserted into the fitting portion 15 more than necessary. However, in the bellows sleeve cap 11, the outer diameter of the fitting portion 15 may be smaller than the inner diameter of the sleeve 13, and the sleeve 13 may be fitted to the outer circumference of the fitting portion 15. With such a structure, the hook 21
Can be omitted.

[0016]

As described in detail above, according to the bellows sleeve cap of the present invention, the fitting portion into which the end of the sleeve is inserted and the telescopic portion extending to the other end of the fitting portion. And a flange that is formed at the other end of the expansion and contraction portion and abuts on the inner surface of the formwork, so that the end of the sleeve is inserted into the fitting portion, while the flange abuts the inner surface of the formwork and is made of concrete. When the casting is performed, a thin wall is not formed between the embedded sleeve end and the beam surface. As a result, the chipping work is eliminated and the chipping of the chipping is not necessary, and the man-hours and the construction cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a bellows sleeve cap according to the present invention.

FIG. 2 is a front view of a bellows sleeve cap according to the present invention.

FIG. 3 is a diagram when a sleeve is attached.

FIG. 4 is a view when a bellows sleeve cap is attached.

FIG. 5 is a diagram when attaching reinforcing bars.

FIG. 6 is a diagram when a separator is attached.

FIG. 7 is a view of a mounting structure using a conventional sleeve.

FIG. 8 is a view showing a position in the beam of a conventional sleeve.

FIG. 9 is a diagram showing a chipping operation of a conventional sleeve.

[Explanation of symbols]

 11 Bellows Sleeve Cap 13 Sleeve 15 Fitting Part 17 Stretching Part 21 Hook 23 Inserting Part 27 Flange

Claims (4)

[Claims] 1. A cylindrical fitting portion which is open at both ends and into which the end of the sleeve is inserted, and a bellows-shaped expanding and contracting portion which extends at the other end of the fitting portion and is expandable and contractible in the central axis direction. A bellows sleeve cap, comprising: an annular flange formed at the other end of the expandable portion and contacting the inner surface of the mold. 2. The bellows sleeve cap according to claim 1, wherein an inner diameter of the expandable portion is formed larger than an outer diameter of the sleeve. 3. A hook is provided in the expanding / contracting portion, the hook being hooked on an end of the sleeve to prevent the sleeve from being inserted into the fitting portion more than a predetermined amount.
Bellows sleeve cap described. 4. The bellows sleeve cap according to claim 3, further comprising a cylindrical insertion portion provided between the expandable portion and the flange and having an inner diameter larger than an outer diameter of the sleeve.