JPH10102769A - Air sleeve and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sufficient tenacity against flying spark, vibrational impulse, etc., and to facilitate insertion to a designated setting position by making a sleeve main body and a side cover in two-layer structure integrally covering on a surface side of a rubber layer with a jacket layer which is large in abrasion resistance and small in flexibility by vulcanized adhesion. SOLUTION: Parts of valve seat cylinders of valves V1 , V2 are vulcanized and adhered and molded on a bottom part to be recessed wall parts 1, 2. Thereafter, fiber woven cloth to be a jacket layer 6 is adhered on a surface side of a rubber plate to be a rubber layer 4 of one side cover C1 . Thereafter, an object on which a recessed wall body with a valve is adhered on a central part of the rubber plate is set in a metal mold, and the whole of it is vulcanized. Additionally, the fiber woven cloth 6 to be the jacket layer 6 is adhered and vulcanized on a surface side of the rubber plate to be the rubber layer 4 of the other side cover C2 . Additionally, the recessed wall body with the valve is adhered on the inside of a circular hole of rubber cylindrical body of a main body B, and the fiber woven cloth to be jacket layer 5 is wound around the overall outer periphery. Consequently, it is possible to provide an air sleeve each joint part of which has high joint strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air sleeve for forming a through hole through which pipes are inserted into a concrete structure, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Various types of air sleeves have been developed, and one of the air sleeves currently in use is as follows. The air sleeve is composed of a closed cylindrical sleeve main body whose both end surfaces are closed in an air injection state, and a cylindrical sleeve cover that covers the outside of the sleeve main body. , Both are formed of PVC (vinyl chloride resin). At the time of use, the outside of the sleeve body in a contracted state is covered with a sleeve cover, and the air is supplied from an air valve provided on a body wall portion of the sleeve body in a state where the sleeve cover is set in a mold for casting concrete. To inflate the sleeve body into a closed cylindrical shape, thereby also integrally deforming the sleeve cover.

[0003] Before concrete is cast, welding for reinforcing bar joining is performed, and the sparks may scatter to the air sleeve set at a designated position. In the conventional air sleeve, both the sleeve body and the sleeve cover are formed to be relatively thin by PVC,
It is broken at almost 75 °. Therefore, there has been a problem in that the sparks directly or indirectly come into contact with each other, so that a hole is formed in the air sleeve and the air sleeve becomes unusable. Also, the separate sleeve cover is cut and used at the site of use in accordance with the length of the sleeve main body, and if the length is slightly shortened, the end of the sleeve main body is cut off. The portion is exposed, and the exposed portion is more easily damaged. Further, the conventional air sleeve is made of PVC.
When the concrete is poured, the concrete may be damaged by the impact if vibration is applied to the poured concrete in order to make the inside quarries uniform.

[0004] Further, since it is composed of a separate sleeve body and a sleeve cover, and has a double structure as a whole and is considerably thick as a whole, it is difficult to insert it into a designated position of a mold. At times, the air valve provided on the sleeve main body must be matched with the hole provided on the sleeve cover, and there is a problem that the usability is poor in this respect. Furthermore, since it is made of PVC, after air is injected into the interior and inflated, even if the air is discharged, the air does not shrink and does not restore its original shape, so that it cannot be reused.

The air valves provided on the body wall and the side wall of the sleeve main body have a so-called plug structure, which deforms the surrounding resin itself and discharges the resin to the sleeve main body. There was also a risk of air leakage from the valve part.

[0006]

SUMMARY OF THE INVENTION In view of the above problems of the conventional air sleeve, the present invention has sufficient toughness to withstand scattered sparks, vibration and shock at the set site. Another object is to provide an air sleeve that can be easily inserted into a designated set position.

[0007]

The air sleeve according to the present invention is provided with a disk-shaped side cover on both sides of a cylindrical sleeve main body, and has a closed cylindrical shape when the shape is retained. An air valve is attached to each of the sleeve body and one of the side covers, and air is injected into the sleeve body to inflate it into a closed cylindrical shape so that it is kept in a mold for casting concrete. After setting, let the inside air out after the concrete has hardened,
By releasing the shape retention and pulling it out, a through hole for inserting pipes into the concrete structure is formed, and the sleeve main body and the side covers on both sides thereof are both provided on the surface of the rubber layer. On the side, the wear resistance is great,
In addition, it is characterized in that it has a two-layer structure in which a small elastic covering layer is integrally coated by vulcanization bonding.

In the method for manufacturing an air sleeve according to the present invention, a disk-shaped side cover is provided on both sides of a cylindrical sleeve main body, and the whole shape at the time of shape retention is a closed cylindrical shape. An air valve is attached to each of the sleeve body and one of the side covers, and the sleeve body and the side covers on both sides of the sleeve body have large abrasion resistance on the surface side of the rubber layer, and furthermore, have an elasticity. In producing an air sleeve having a two-layer structure in which a small outer covering layer was integrally coated by vulcanization bonding, a cylindrical sleeve body with an air valve integrally attached, and an air valve attached to only one of them. A pair of disk-shaped side covers is molded in advance in a state where the outer layer is superimposed on the surface side of the rubber layer, and on the inner periphery of both ends of the sleeve body, Serial in a state where the fitting the fitting joint ring provided on the peripheral edge of each side cover, that the whole of the molded and vulcanized and set in a mold, and its features.

In the air sleeve according to the present invention, the cylindrical sleeve main body and the pair of side covers provided on both sides of the sleeve have large abrasion resistance and elasticity on the entire surface of the rubber layer. Has a composite structure in which the small outer layer is integrally coated by vulcanization bonding, and thus has sufficient toughness to withstand scattering sparks, vibrations, and the like at the set site. In addition, the air sleeve according to the present invention has an integral structure as a whole, has no separate object, and further has a cover layer integrally coated on the surface side of the main portion, compared with a case where only the rubber layer is used. As a result, since the holding force of the shape along the longitudinal direction increases, the work of inserting the mold into the designated set position becomes easy.
Further, if the sleeve body and a pair of side covers provided on both sides thereof are formed by vulcanizing and bonding separate bodies, the joint between the sleeve body and the side cover has an edge shape. When the air is injected and inflated into a closed cylindrical shape that is in use, the connection between the sleeve body and the side cover does not greatly swell, so that the side covers on both sides of the sleeve body adhere to the inner surface of the mold. As a result, the set state of the air sleeve is stabilized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples. FIG. 1 is a perspective view of a use state of an air sleeve S according to the present invention, FIG. 2 is a longitudinal sectional view of the same, FIG. 3 is an enlarged sectional view taken along line XX of FIG. FIG. 5 is an enlarged view of a portion Y in FIG. 2, and FIG.
Is an enlarged view of the portion, FIG. 6 is an enlarged sectional view of a state where the injection of air from the air inlet valve V ₁ to the air sleeve S, FIG. 7, the air sleeve S from the air discharge valve V ₂ It is an expanded sectional view in the state where air is discharged.
As shown in FIGS. 1 and 2, an air sleeve S according to the present invention includes a cylindrical sleeve body B and a pair of disc-shaped sleeve bodies B for closing the opening surfaces at both ends of the sleeve body B. is constituted by the side covers C _1, C _2, the sleeve body B, together with the air inlet valve V ₁ is attached to one of the side covers C _1, the air discharge valve V ₂
Is installed. The sleeve body B and one of the side covers C ₁ have concave wall portions 1,
2 are provided, and each of the valves V ₁ and V ₂ is attached to the bottom of the concave wall portions 1 and 2 in a depressed state.

As shown in FIGS. 2 to 4, both the sleeve body B and the pair of side covers C ₁ and C ₂ have outer layers 5 and 6 on the surface side of the rubber layers 3 and 4, respectively. It has a two-layer structure integrally coated with sulfuric acid. The dimensions of each part of the air sleeve S are, for example, (55) as a combination (L, D) of the length L (mm) and the outer diameter D (mm).
0,150), (600,175), (700,20
0). In addition, the thicknesses t ₁ , t of the rubber layers 3, 4 and the jacket layers 5, 6 of the air sleeve S
₂ is about 1.5 (mm) and about 0.8 (mm), respectively.
The jacket layers 5 and 6 are made of a fiber woven fabric called a “cord” in which fibers are appropriately woven such as a blind weave or a lattice weave, and are integrally formed on the surface of the rubber layer by a manufacturing method described later. Vulcanized. Thus, the sleeve body B
And the pair of side covers C ₁ and C ₂ , both of which have the above-mentioned outer cover layers 5 and 6 integrally vulcanized and bonded to the surfaces of the rubber layers 3 and 4, respectively. Compared with the case, the wear resistance is significantly increased and the elasticity is reduced. By adhering the jacket layers 5 and 6 made of the above-described fiber woven fabric to the surface, the expansion and contraction rate of the sleeve main body B is 1
% Or less. Further, since the main body of the sleeve body B and the pair of side covers C ₁ and C ₂ are formed of the rubber layers 3 and 4, the air sleeve S as a whole has the flexibility unique to rubber. doing.

A sleeve body B and one side cover C
_The valves V ₁ and V ₂ for air injection and air discharge respectively attached to ₁ have the same structure, and as shown in FIG. 6, a valve seat cylinder 11 having a female screw formed on the outer peripheral surface. With the embedded nut 12 screwed to one end, substantially half of the valve seat cylinder 11 and the embedded nut 12 are connected to the concave wall portions 1 and 2.
And the other half of the valve seat cylinder 11 projects into the recesses 7 and 8 formed by the concave walls 1 and 2, and the plunger insertion hole of the valve seat cylinder 11 is provided. 11a
A plunger 13 is removably inserted into the recessed portions 7 and 8, and a rubber tube 14 serving as a valve is inserted into and adhered to the outer peripheral surface of the plunger 13. When air of a predetermined pressure is externally injected from the air introducing hole 13a, a gap through which air can pass is formed between the outer peripheral surface of the plunger 13 and the rubber tube 14 which is in close contact with the outer surface, and the air sleeve S It has a structure in which air is injected into the inside. A retaining nut 15 for retaining the plunger 13 is provided on the protruding portion of the plunger 13.
Is screwed. In the figure, reference numeral 16 denotes the plunger 1
3 is a key-shaped engaging projection partly buried in the outer peripheral portion along the longitudinal direction thereof, and the projection 16 comes into contact with the flange portion 15a of the retaining nut 15 so that the plunger 13 are prevented from coming off.

Further, as shown in FIG. 7, the screw of the retaining nut 15 with respect to the plunger 13 is released, and the plunger 13 inserted into the valve seat cylinder 11 is pulled out toward the concave portions 7 and 8. be able to. Thereby, the inside of the sleeve body B communicates with the atmosphere through the plunger insertion hole 11a provided in the valve seat cylinder 11, the air in the sleeve body B is discharged, and the closed cylindrical shape of the air sleeve S is formed. The shape-retained state is destroyed.

Next, a method of manufacturing the air sleeve S will be described. First, as shown in FIG. 10, valves V ₁ , V ₂
(Hereinafter referred to as "valve wall body 20 with valve") in which the portion of the valve seat cylinder 11 is vulcanized and bonded in advance. A ring disk-shaped fiber woven fabric 6 'serving as the outer coating layer 6 is adhered to the surface side of a ring disk-shaped rubber plate 4' serving as the rubber layer 4 of _one side cover C1. The concave wall body 20 with the valve is adhered to the center of the ring-shaped rubber plate 4 'in a mold (not shown), and the whole is vulcanized. Further, 'the surface side of the fiber fabric 6 in which the disc-shaped as a jacket layer 6' other side cover C ₂ of disk-shaped rubber plate 4 serving as the rubber layer 4 by bonding, and the The whole is vulcanized in the same manner. Thereby, vulcanized side covers C ₁ and C ₂ are obtained.

Further, a rubber cylinder 3 'to be the rubber layer 3 of the sleeve body B is formed by extrusion molding, and the concave wall with valve is provided inside a circular hole 17 provided in the rubber cylinder 3'. The body 20 is adhered, and a fiber woven fabric 5 ′ serving as the jacket layer 5 is further wound around the entire outer circumference of the rubber cylindrical body 3 ′. In this way, the concave wall body 20 with the valve is adhered to the inner peripheral surface where the circular hole 17 is located, and the rubber cylindrical body 3 'with the fiber woven fabric 5' wound around the outer peripheral surface thereof is untreated. It is sulfuric acid.

FIG. 12, FIG.
Alternatively, as shown in FIG. 14, a thin rubber layer 21 is coated on both sides or one side using a calender roller device (see FIGS. 13 and 15). FIG.
In FIG. 14 and 22, reference numeral 22 denotes a roller around which a fiber woven fabric is wound, and reference numeral 23 denotes a rubber raw material for forming a thin rubber layer.

As shown in FIG. 11, a fiber woven fabric 5 'serving as a jacket layer 5 is wound around the entire outer periphery of a rubber cylindrical body 3' serving as a rubber layer 3 of a sleeve body B. the face, the side covers C _1, C ₂ of rubber layer 4 to become ring-disk-shaped, or has an annular fitting portion 4'a provided on the periphery of a disc-shaped rubber plate 4 '-fitted In this state, the whole is set in a mold 24 and vulcanized. This allows
In each of the sleeve body B and the pair of side covers C ₁ and C ₂ , the portion to be the rubber layer and the portion to be the outer cover layer are vulcanized and joined to form a single body. The pair of side covers C ₁ and C ₂ are vulcanized and bonded at the portion of the annular fitting portion 4 ′ a, and the desired air sleeve S is formed.

The use of the air sleeve S to form a through hole for inserting pipes into a concrete structure is performed as follows. In FIG. 9, the form 2
After setting the non-retained air sleeve S 'in which the air is not sufficiently injected into the designated position of _{No. 5} , the air injection hose 26 is connected to the air injection valve V1 attached to the sleeve body B. When air of a predetermined pressure is injected into the air sleeve S through the hose 26, the air sleeve S becomes a closed cylindrical shape with both ends closed, and this shape is maintained. In the shape retaining state of the air sleeve S, the side covers C ₁ and C _{2 at} both ends thereof are in close contact with the inner wall surface of the mold 25.

[0019] and Da設concrete in a mold 25 in the above state, after curing, remove the mold 25, the side surface portion of the air discharge valve V ₂ of the side covers C ₁ exposed to the concrete structure Let the inside air out of the. That is, as shown in FIG. 5, the screwing of the retaining nut 15 with respect to the plunger 13 is released, and the valve seat cylinder 1 is released.
When the plunger 13 inserted into the valve seat 1 is pulled out, a plunger insertion hole 11a
The inside of the sleeve body B and the atmosphere communicate with each other through the air, and the air in the sleeve body B is discharged, and the shape retention state of the air sleeve S is broken. Then, when the air sleeve S 'in the non-retained state is removed from the concrete structure,
In the portion where the air sleeve S was located, a through hole having the same shape as this is formed.

Here, the air sleeve S according to the present invention comprises:
The outer layers 5, 6 are formed on the outer sides of the rubber layers 3, 4 constituting the main part, and the outer layers 5, 6 are made of the fiber fabric as described above. The portions of the jacket layers 5 and 6 have high abrasion resistance and low elasticity. For this reason, the thickness of the air sleeve becomes the sum of the thicknesses of the rubber layers 3 and 4 and the outer layers 5 and 6 and becomes larger, and the outer layers 5 and 6 are provided on the surface side. As a result, the toughness is increased, and it is possible to sufficiently withstand scattering sparks, vibrations, and the like at the set site, and there is no damage due to these factors. Further, the air sleeve according to the present invention has a coating layer integrally coated on the outer side of the rubber layer which is the main part, and has a holding force of a shape along the longitudinal direction as compared with the case of only the rubber layer. Therefore, the setting at the designated position in the formwork is facilitated. In addition, the whole is of an integrated structure, there is no separate object, and the air injection valve V
_{Since 1} is in the recessed portion 7, the work of injecting air becomes easy.

Further, as in the above embodiment, the sleeve body B constituting the air sleeve S and the pair of side covers C ₁ , C ₂ provided on both sides thereof are vulcanized and adhered separately. With the integrally molded structure, the joint between the sleeve body B and the side covers C ₁ and C ₂ becomes edge-shaped,
In a state in which air is injected and inflated into a closed cylindrical shape in use, the sleeve body B and the side covers C ₁ , C
₂ , the side covers C ₁ , C ₂ on both sides of the sleeve main body B are easily brought into close contact with the inner wall surface of the mold frame 25, so that the set state of the air sleeve 8 is stabilized. The concrete does not flow into the space where the through hole is to be formed.

In the method of manufacturing the air sleeve of the above embodiment, the preformed concave wall body 20 with a valve is formed into a rubber cylindrical body 3 ′ to be the rubber layer 3 of the sleeve body B or a ring disk shape. due to the vulcanized rubber sheet 4 ', the wall of the portion of the valves V _1, V ₂ are formed thicker than other portions. Therefore, even when the air sleeve is inflated by injecting air, the valves V ₁ , V ₂ are prevented from bulging, and there is an advantage that the mounting position is stabilized.

When the air inside the non-retained air sleeve S 'is drawn out by discharging the internal air, the air sleeve S' shown in FIG.
When the handle 18 is integrally provided at the end of the sleeve main body B as shown in FIG.

[0024]

As described above, since the air sleeve according to the present invention has a two-layer structure in which the outer layer is integrally coated on the surface side of the rubber layer in all the portions, Compared with the case of only the layer, the toughness is significantly increased,
Since the fire resistance, the vibration resistance, and the like are increased, various effects as described above are exerted.

According to the method of manufacturing an air sleeve according to the present invention, the rubber layer and the outer cover layer on the surface side can be strongly vulcanized and bonded at each part of the sleeve body and the side cover. Since the joint between the main body and the side cover is also vulcanized and bonded, an air sleeve in which each joint has high joining strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a use state of an air sleeve S according to the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is an enlarged sectional view taken along line XX of FIG. 2;

FIG. 4 is an enlarged view of a portion Y in FIG. 2;

FIG. 5 is an enlarged view of a portion Z in FIG. 2;

6 is an enlarged sectional view of a state where the injection of air from the air inlet valve V ₁ to the air sleeve S.

7 is an enlarged cross-sectional view of a state in which the air discharge valve V ₂ are discharging air in the air sleeve S.

FIG. 8 is a partial sectional view of an air sleeve S provided with a handle 18 for pulling out.

FIG. 9 is a sectional view showing a state in which an air sleeve S is set in a mold 25.

FIG. 10 is an explanatory diagram of a method for manufacturing an air sleeve S according to the present invention.

FIG. 11 shows a sleeve body B and a pair of side covers C ₁ , C
FIG. 4 is a cross-sectional view showing a state in which a product obtained by assembling No. ₂ is set in a mold 24 for vulcanization molding.

FIG. 12 is a view showing a state in which thin rubber layers 21 are stuck on both sides of a fiber woven fabric 5 ′ (6 ′) forming the outer coating layers 5 and 6 of the air sleeve S.

FIG. 13 is a cross-sectional view showing a state in which thin rubber layers 21 are attached to both sides of a fiber woven fabric 5 ′ (6 ′).

FIG. 14 is a view showing a state in which a thin rubber layer 21 is attached to one side of a fiber woven fabric 5 ′ (6 ′) forming the outer layers 5 and 6 of the air sleeve S.

FIG. 15 is a cross-sectional view showing a state in which a thin rubber layer 21 is attached to one side of a fiber woven fabric 5 ′ (6 ′).

[Explanation of symbols]

B: Sleeve body C ₁ , C ₂ : Side cover S: Shape-retained air sleeve S ′: Non-retained air sleeve V ₁ : Air injection valve V ₂ : Air discharge valve 1: Concave wall of sleeve body 2: Concave wall part of side cover 3: Rubber layer of sleeve body 4: Rubber layer of side cover 4'a: Ring-shaped fitting part of side cover 5: Outer layer of sleeve body 6: Outer layer of side cover 13 : Plunger 14: Rubber tube 18: Handle

Claims (7)

[Claims] 1. A disk-shaped side cover is provided on each side of a cylindrical sleeve main body, and the overall shape at the time of shape keeping is a closed cylindrical shape. Each air valve is attached, air is injected into the inside, it is inflated into a closed cylinder and kept in shape, set in a mold for casting concrete, and after the concrete hardens, the inside air is released. An air sleeve for forming a through hole through which pipes are inserted into a concrete structure by discharging, releasing the shape retention, and pulling it out, wherein the sleeve body and side covers on both sides thereof are The air is characterized by having a two-layer structure in which the outer layer of the rubber layer has high abrasion resistance and small elasticity and is integrally coated by vulcanization bonding on the surface side of the rubber layer. Reeve. 2. The air sleeve according to claim 1, wherein the jacket layer has a structure in which rubber is integrally attached to one side or both sides of a fiber woven fabric in which fibers are appropriately woven. 3. The air sleeve according to claim 1, wherein the sleeve body and the air valve respectively attached to the one side cover are attached in a state where the entirety is depressed in the concave wall portion. 4. The air sleeve according to claim 1, wherein the sleeve body and a pair of side covers provided on both sides of the sleeve body are separately vulcanized and bonded. 5. The air valve according to claim 1, wherein the air valve includes a plunger provided with an air introduction hole, and a rubber pipe which is fitted and fitted to the outer periphery thereof to form a valve action. sleeve. 6. The air sleeve according to claim 1, wherein the side cover is provided with a handle to be gripped when the shape is released and taken out. 7. A disk-shaped side cover is provided on each side of a cylindrical sleeve main body, and the overall shape at the time of shape keeping is a closed cylindrical shape. Each of which has an air valve, the sleeve main body and the side covers on both sides thereof have a large abrasion resistance on the surface side of the rubber layer,
In addition, a method of manufacturing an air sleeve having a two-layer structure in which a small elastic outer layer is integrally coated by vulcanization bonding, wherein a cylindrical sleeve body having an air valve integrally attached thereto and an air valve only in one side A pair of disk-shaped side covers to which is attached is molded in advance in a state where the outer layer is overlaid on the surface side of the rubber layer, and on the inner periphery of both ends of the sleeve body, A method of manufacturing an air sleeve, wherein the whole is set in a mold and vulcanized and formed in a state in which an annular fitting portion provided on a peripheral edge of each of the side covers is fitted.