JP2856913B2 - Flexible mold material and through hole forming method using the same - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flexible form material which is preferably used mainly when constructing a new building mainly for reinforced concrete construction and steel-framed rebars, steel frames and wooden foundation works. The present invention relates to a method of forming a through hole that is used.

In the construction work when constructing the building as described above, it is necessary to form through holes in beams, walls, slabs, foundations, etc., in connection with general facility work, and ventilation ventilation of the building, etc. A form material for forming a through hole at the same time when concrete is cast is used.

BACKGROUND ART Paper tubes, steel plates and steel tubes are generally used as conventional mold members of this type. That is, in the conventional method, as shown in FIG. 13, for example, a paper tube c is interposed between desired positions of an outer mold frame a and an inner mold frame b for molding a slab, a beam, and a wall. In this state, concrete is poured between the outer mold a and the inner mold b. And
After the concrete is hardened and the outer mold a and the inner mold b are removed, the paper tube c is removed to form a through hole.

However, as shown in FIG. 13, a large number of reinforcing bars d and e are inserted into the upper and lower positions of such through holes. Therefore, in order to set a paper tube c larger in diameter than the arrangement pitch of the reinforcing bars d, the paper tube c is temporarily thinly deformed and inserted between the reinforcing bars d, and then the paper tube c is returned to the original shape. It is necessary to bridge between the outer frame a and the inner frame b while returning to. Therefore, in order to form a large number of through-holes c, the preparation requires a lot of trouble and time. In addition, the paper tube c may be set without sufficiently returning to the original shape, which may easily cause a problem that the opening shape of the through hole is distorted.

As a method of solving such a problem, it is conceivable to set the paper tube c at the stage where the lower reinforcing bar e is provided, and then to install the upper reinforcing bar d after that. Then, it is not possible to continuously perform the formwork and the reinforcing work, which adversely affects the work efficiency. In addition, in this case, the possibility that the once set paper tube c is displaced due to an unexpected external force when the upper reinforcing bar d is disposed increases, and the through hole is accurately formed at a predetermined position. You can't do that.

An object of the present invention is to provide a flexible form material capable of reliably solving the above-mentioned problems.

DISCLOSURE OF THE INVENTION The present invention employs the following means to achieve the above object. That is, the flexible form member according to the present invention comprises a flexible hollow main body, an openable / closable fluid introduction / extraction means for introducing / leaving fluid into / from the main body, and a main body and a cover. The body comprises a peripheral wall, and an end wall which is air-tightly and integrally fixed to both ends of the peripheral wall,
The fluid outlet / inlet means is provided at least at the peripheral wall and at the center of the end wall in one direction, and is configured to be buried in the main body.

As the fluid introduction / reception means in the present invention, it is preferable that the fluid introduction / reception means include a cylindrical passage portion communicating with the main body, and a plug member that is openably and closably attached to an outer end of the passage portion. The length of the passage is not particularly limited, and may be short such that the plug member comes to a position very close to the main body. Further, it is preferable that the passage portion has a check valve at an end on the main body side.

 Further, it is preferable that the peripheral wall has a cylindrical shape.

Further, in the method of forming a through hole according to the present invention, the flexible mold member may include a flexible hollow main body, and an openable / closable fluid introduction / extraction means for introducing / introducing a fluid into / from the main body. When,
A removable cover for covering the main body,
A peripheral wall and ends fixed airtightly and integrally to both ends of the peripheral wall, and a fluid lead-in / out means is provided at least in the peripheral wall and a central part of one end wall; Is constructed so as to be buried in the main body.The main body, in which the internal fluid is drawn out from the fluid introduction / reception means and reduced, is held in a cover between the outer mold and the inner mold to block the flow of concrete. In this state, a fluid is introduced into the main body of the flexible form material from the fluid introduction / introduction means, and the main body is enlarged to cover the outer form and the inner form with a cover. Erection, casting concrete between the outer mold and the inner mold, removing the outer mold and the inner mold at the stage when the concrete is hardened, and from the inside of the main body through the fluid deriving / introducing means. The flexible formwork is reduced by drawing fluid and A flexible mold material cured by removing from the cured concrete to form a through-hole in the concrete.

In the case of a flexible form material having such a configuration, the body is filled with a fluid such as air, and between a predetermined form form that blocks the flow of concrete in order to form a slab or a wall. By setting the dimension so that it can be installed so as to be stretched, it becomes possible to form an inward through hole corresponding to the outer dimension of the main body.

That is, in such a case, the flexible main body can be reduced in size by extracting the fluid therein. Therefore, first, the main body is brought into the cover at a desired position between the inner and outer molds by passing through the narrow gap in a state where the main body is reduced, and a fluid such as air is introduced into the main body from the fluid lead-in / out means in that state. I do. As a result, the main body becomes voluminous and is covered with a cover between the molds and installed. In this state, concrete is poured between the formwork,
When the concrete has hardened, the formwork is removed. As a result, the surface of the flexible form material that has been in close contact with the inner surface of the form is exposed on the surface of the concrete structure.
In this state, a fluid is extracted from the inside of the body of the flexible form member, and the flexible form member is removed, whereby a through hole is formed at a required portion of the concrete structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing one embodiment of the present invention. FIG. 2 is an enlarged perspective view showing a fluid inlet of the embodiment. FIG. 3 is a schematic sectional view for explaining a use mode of the embodiment. FIG. 4 is an explanatory view of a process for using the embodiment. FIG. 5 is a process explanatory view for explaining a use mode of the embodiment. FIG. 6 is a process explanatory view for explaining a use mode of the embodiment. FIG. 7 is a process explanatory view for explaining a use mode of the embodiment. FIG. 8 is a process explanatory view for explaining a use mode of the embodiment. FIG. 9 is a perspective view showing another embodiment of the present invention. FIG. 10 is a perspective view showing still another embodiment of the present invention. FIG. 11 is a perspective view showing still another embodiment of the present invention. FIG. 12 is a perspective view when the cover in the embodiment is integrated with a flexible mold member. FIG. 13 is a perspective view for explaining a conventional example. BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of the present invention will be described below with reference to FIG. 1 to FIG.

The flexible form member 1 includes a flexible aerial body 2 and openable and closable fluid introduction / extraction means 3 and 4 for introducing / leaving air as a fluid into the body 2. Do it.

More specifically, the main body 2 is a hollow cylindrical body in which a peripheral wall 21 made of vinyl chloride and end walls 22 and 23 are air-tightly integrated by heat welding or the like, and a central portion of the peripheral wall 21 and Fluid outlet / inlet means 3 and 4 are provided at the center of one end wall 22, respectively. The dimensions of the main body 2 are different depending on the purpose, but, for example, those having a diameter of about 50 mm to 300 mm and a length of about 50 mm to 1000 mm are standard. The pressure resistance may be about 0.6 kg / cm ² .

The fluid inlet / outlet means 3, 4 has a cylindrical passage portion 32, 42 having a check valve 31, 41 at an inner end thereof, and a lid capable of being opened and closed at an outer end of the passage portion 32, 42. It comprises plug members 33 and 43. The check valves 31, 41 and the plug members 33, 43 may have the same structure as that used for a bladder, a beatball, or the like. Specifically, the check valves 31 and 41 are formed of elastically bendable disks having a slightly larger outer diameter than the inner diameters of the passage portions 32 and 42, and in a normal state, the check valves 31 and 41 The main body side end is closed, and when fluid is press-fitted into the passages 32 and 42, the fluid is opened by the pressure. Also, plug members 33, 43
The flanges 33a, 43a are formed of tapered round bars 33b, 43b formed at one end, and the sharpened ends of the round bars 33b, 43b are fitted into the passage portions 32, 42. It has become. The flanges 33a and 43a are opened and closed easily.
The outside diameter of the passages 32 and 42 is slightly larger than
They are attached to the ends of the passages 32 and 42 by c and 43c. Thus, with the plug members 33 and 43 removed, the passage portions 32 and 42 are removed.
The air can be introduced into the main body 2 by inserting a tube or the like into the main body 2 and blowing the air A. The check valves 31, 41 are opened by picking the inner ends of the passages 32, 42. Thereby, the air in the main body 2 can be led to the outside. The fluid introduction means 3, 4
After closing the plug members 33 and 43, the passage portions 32 and 42 are
It is configured to be buried inside. The upper surfaces of the plug members 33 and 43 are flush with the surface of the main body 2 when the fluid introduction means 3 and 4 are buried.

A method of forming a through-hole using the flexible form member 1 will be described with reference to FIGS. Figure 3 shows a schematic section of a part of a reinforced concrete building.
5 is a slab, 6 is a beam, 7 is a wall, and 8 is a ceiling plate. 61 indicates an upper reinforcing bar, and 62 indicates a lower reinforcing bar. Although a large number of rebars are provided in other portions, they are not shown because they have no direct relation to the present invention.

The case where the through hole 9 of the beam 6 is formed will be described. First, as shown in FIG. 4, the main body 2 of the flexible form material 1 is passed through the upper reinforcing bars 61 in a contracted state to thereby form an inner space. Formwork 63
The air A is introduced into the main body 2 from the fluid outlet / inlet means 3 in this state. That is, as shown in FIG.
The tube 34 is attached to the fluid introduction / introduction means 3 provided in the above, and the air A is blown into the main body 2 of the flexible form material 1 using a not-shown two-compressor or bellows. This allows the body 2
Is enormously enlarged and is stretched between the formwork 63 and 64. In other words, one end wall 22 is brought into close contact with the inner surface of the inner mold frame 63, and the other end wall 23 is pressed against the inner surface of the outer mold frame 64. In this state, as shown in FIG. 6, concrete 10 is poured between the molds 63 and 64, and the molds 63 and 64 are removed when the concrete 10 has hardened. As a result, as shown in FIG.
The surfaces that were in close contact with the inner surfaces of the formwork 63, 64, that is, both end walls
The outer surfaces of 22, 23 will be exposed on the surface of the concrete structure. In this state, the fluid lead-in / out means 4 provided on the end wall 22 is opened, the air A is extracted from the inside of the main body 2 of the flexible form material 1, and the flexible form material 1 thus reduced
As shown in FIG. 8, through holes 9 are formed in required portions of the beam 6.

However, with such a configuration, even after the upper and lower rebars 61 and 62 are arranged, the main body 2 is allowed to pass through the narrow gap formed between the rebars 61 in a state where the main body 2 is reduced. The flexible form member 1 can be set at a desired position by bringing it to a desired position between the frames 63 and 64 and then introducing air A into the main body 2 from the fluid inlet / outlet means 3 in that state. . For this reason, it is possible to solve the problem that it takes time to set the flexible form material, or the flexible form material does not recover well after passing through the gap and the through hole 9 is distorted. In addition, with such a structure, since the flexible form material 1 can be set immediately before the concrete placing work, the flexible form material 1 may be displaced by an unexpected external force after the setting. The possibility of occurrence can be greatly reduced, and the through hole 9 can be formed at an accurate position. Further, when the hollow cylindrical main body 2 is used as in this embodiment, even if the length of the main body 2 is different from the distance between the inner and outer mold frames 63 and 64, either one end of the main body 2 may be used. Wall 2
2 and 23 are inserted inside the body 2
By shortening the length dimension of the inflated member, the size can be easily adjusted at the construction site.

In the above-described embodiment, the case where the flexible form member includes only the main body and the fluid introduction / extraction means has been described. However, the present invention is not necessarily limited to such a case. It may be as shown in FIG. That is, the flexible form material 101 shown in FIG.
02 and the fluid outlets 103 and 104, as well as a reinforcing cord 111 wound around the outer periphery of the main body 102, and bonding portions 112 and 11 provided on the end walls.
3 is provided. The reinforcing cord 111 enhances the shape retention of the main body 102 and enables the introduction of a fluid with a higher pressure, and the end 111a of the reinforcing cord 111 is extended and tied to a reinforcing bar or the like. In this way, it is possible to effectively prevent displacement and deformation of the central portion. The bonding portions 112 and 113 are formed by applying a bond or the like to an end wall of the main body 102, and are protected by a release paper or the like when not in use. Thus, if such bonding portions 112 and 113 are provided, when the main body 102 is expanded, the end walls thereof are pressed against and bonded to the inner surfaces of the inner mold frame 63 and the outer mold frame 64. . Therefore, the displacement of the flexible mold member 101 with respect to the inner mold frame 63 and the outer mold frame 64 can be reliably prevented.

Further, the shape of the main body is not limited to a columnar shape, and may be, for example, a shape as shown in FIG. 10 to FIG. That is, the flexible form material 301 shown in FIG.
Is provided with a cubic main body 302, and is used when forming a rectangular through hole whose length dimension and opening height dimension are substantially equal. The flexible form member 401 shown in FIG. 11 has a rectangular parallelepiped main body 402 and is used for forming a rectangular through hole.

Further, the material of the main body is not limited to vinyl chloride. For example, various materials having flexibility similar to those of us, such as polyethylene, rubber, and the like can be used. In general, a material that does not become hard at low temperatures and that does not easily soften at high temperatures is preferable. Low and high temperatures refer to those that are close to the minimum and maximum temperatures of the construction site.

Also. The fluid introduced into the body is not limited to air, but may be other gases.

In addition, in each of the embodiments described above, the fluid outlet / inlet means has a check valve.
It is possible to omit the passage by making the length of the passage easy to grasp with a finger. That is, when the fluid has been introduced into the main body, the passage member may be pinched by a finger so as not to flow out to close the plug member. In such a configuration having no check valve, the operation of extracting the fluid is facilitated. However, after closing the plug member, the passage portion may be buried in the main body.

In each of the above embodiments, the flexible form material is directly disposed in the gap between the reinforcing bars arranged, but at least the flexible form material has a cover made of a flexible sheet material. ,
A portion that contacts the concrete may be covered and disposed.

In other words, in the flexible form member 1 shown in FIG. 1, a cylindrical cover 701 having substantially the same length as the length thereof and having an inner diameter substantially the same as the outer diameter when enlarged is preferable. It is. Such a cover 701 is preferably made of a material having a smaller flexibility characteristic than the flexible mold material 1, that is, a material that does not easily expand due to the pressure of the flexible mold material 1 during use. The shape may be a cylindrical shape in accordance with the external shape of the flexible form 1 to be covered when it is huge.
In the case of the embodiment shown in FIG. 11, a square tube may be used. Then, as shown in FIG. 12, on the outer surface, fastening portions 724 are provided at a plurality of locations as in the case of the flexible mold member 601, and a takeout hole 741 is provided at a portion corresponding to the fluid introduction means 3,
When introducing air, the fluid introduction means 3 can easily cover the cover 701.
So that it extends to the outside. This extraction hole 741
The lid can be closed after air is introduced by a lid 742 provided integrally on the outside.

Thus, in the case of using the cover 701 together,
The reduced flexible form material 1 is inserted into the cover 701, and the cover 701 and the flexible form material 1 are arranged at a position where the flexible form material 1 is to be constructed, and air is introduced and used. That is, when the flexible form material 1 is inserted into the cover 701 in a reduced state,
It differs from the above embodiments only, and otherwise can be constructed in the manner described above. Then, when air is evacuated from the flexible form material 1 at the stage when the concrete has hardened, the cover 701 is attached to the through hole 9 formed in the concrete.
The flexible form member 1 can be easily taken out of the through-hole 9 in a reduced state, as in the above embodiment. Therefore, the flexible form material 1 does not come into contact with concrete, and its outer surface is less likely to become dirty even when used, and the number of times of use is further increased as compared with the case where the cover 701 is not used together. Also, cover 701
Covers the outside of the flexible form material 1, so that the overall strength as the form material is increased, so that the through hole 9 can be accurately formed without being easily deformed during use. it can.

It is preferable that the above-described flexible form materials 1, 101, 301, 401 and the cover 701 are colored in a color that is easy to identify at the construction site. In other words, by setting the color completely different from that of the reinforcing bars and other form materials, it is possible to easily confirm at which position the steel bar is arranged after the construction. Further, since the checking operation is facilitated, it is possible to reduce the total man-hours for disposing the flexible form material.

Various other modifications are possible without departing from the spirit of the present invention.

INDUSTRIAL APPLICABILITY As described above, the flexible form material according to the present invention and the through-hole forming method using the same are arranged at a predetermined position in the formwork after the rebar arrangement, and This is useful for forming a through hole in a hole. In addition, it is possible to easily form an accurate through-hole without shape collapse or displacement.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E04G 15/06 F16K 15/20

Claims (8)

(57) [Claims] A hollow body having flexibility, an openable / closable fluid introduction / extraction means for introducing / leaving a fluid into / from the main body, and a detachable cover for covering the main body;
The main body is composed of a peripheral wall, and end walls airtightly and integrally fixed to both ends of the peripheral wall, and a fluid lead-in / out means is provided at least on the peripheral wall and a central portion of one of the end walls. A flexible form member configured so that the lead-in / out means is buried in the main body. 2. The fluid introduction / extraction means according to claim 1, wherein said fluid introduction / extraction means comprises a cylindrical passage portion communicating with the main body, and a plug member openably and closably attached to an outer end of the passage portion. The flexible form material according to the above. 3. The flexible form member according to claim 2, wherein the passage portion has a check valve at an end on the main body side. 4. The method according to claim 1, wherein the peripheral wall is cylindrical.
Or the flexible form material of Claim 3. 5. A flexible hollow body having a flexible hollow body, fluid opening / closing means for opening / closing fluid for introducing / leaving fluid into / from the body, and a detachable cover for covering the body. A cover, wherein the main body comprises a peripheral wall and end walls hermetically and integrally fixed to both ends of the peripheral wall, and the fluid lead-in / out means is provided between the peripheral wall and a center of one of the end walls. And at least a part, wherein the fluid lead-in / out means is configured to be buried in the main body, and an outer die for blocking the flow of concrete by reducing the body in which the internal fluid is extracted from the fluid lead-in / out means and reduced. It is brought into the cover between the frame and the inner mold, and in that state, the fluid is introduced into the main body of the flexible mold material from the fluid introduction / inlet means, and the body is enlarged to form the outer mold. Between the outer and inner molds with a cover. When the concrete is hardened, the outer mold and the inner mold are removed at the stage when the concrete has hardened, and the fluid is drawn out from the inside of the main body through the fluid introduction / reception means to reduce the flexible mold material. A through-hole forming method in which the flexible form material is removed from the hardened concrete and hardened to form a through-hole in the concrete. 6. The fluid introduction / extraction means according to claim 5, further comprising a tubular passage communicating with the body, and a plug member openably and closably attached to an outer end of the passage. The method for forming a through hole according to the above. 7. The through hole forming method according to claim 6, wherein the passage portion has a check valve at an end on the main body side. 8. The method according to claim 5, wherein the peripheral wall is cylindrical.
Or the method of forming a through hole according to claim 7.