JP2006241780A - Sleeve forming member and sleeve forming method for concrete form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved novel sleeve forming member for a concrete form. <P>SOLUTION: The sleeve forming member for the concrete form has a sleeve plate 3 bendable in one direction to form a cylindrical sleeve, and a holder for holding the sleeve plate 3 in cylindrical shape at both ends. The holder A has a first member 1 cut out at a part of annular shape and provided with a guide groove 1B at the cutout end to be able to insert or remove the sleeve plate, and a second member 2 of annular shape arranged at the outer periphery of the first member 1 to hold the sleeve plate 3 in cylindrical shape between itself and the first member 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concrete formwork sleeve forming member and a sleeve forming method used for forming a through hole in a beam or wall portion of a concrete building.

  When constructing concrete buildings, when forming through holes through which electrical wiring, water pipes, gas pipes or pipes for air conditioning equipment are formed in the beams and walls, water resistance that has been impregnated with wax, etc. A paper sleeve (also called “void sleeve” in the industry) is cut to the required length and placed in advance on the part of the formwork that will become the beam or wall. A method of making a through hole is widely used.

  However, in order to fix the conventional paper sleeve in the formwork, it is necessary to fix both ends to the inner wall of the formwork with nails etc. using a hammer while the bar arrangement is complicated. Therefore, the work was very poor and work was difficult. Further, the paper sleeve must be removed when the concrete is solidified, and further post-operation work is required after solidification. Furthermore, since it is difficult to fit the sleeve exactly to the dimensions of the formwork, in such a case, it was necessary to close the gap formed between them with tape or the like.

In view of such a situation, the present inventor has provided a sleeve forming member and the like of a new form including a sleeve plate that can be bent in one direction and a sleeve support ring that holds the sleeve plate at both ends ( Patent Document 1). This sleeve forming member is epoch-making in that it solves various technical problems of the sleeve.
Japanese Patent No. 3614809.

  However, the sleeve forming member has the following technical problems. In other words, fixing the sleeve support ring holding the sleeve plate to the form plate material in a mold in which a plurality of rebars are arranged in a complicated manner is a troublesome task, and the fixed sleeve support ring Inserting the sleeve plate into the narrow guide groove inside can be a daunting task. In addition, since the structure is complicated, the manufacturing cost is increased.

  The present invention has been made in view of such circumstances, and a novel sleeve forming member for concrete formwork in which the technical problem is further improved, and a sleeve forming method using the concrete formwork sleeve forming member. The purpose is to provide.

  The object of the present invention can be solved by a concrete form sleeve forming member and a sleeve forming method having the following configuration.

A concrete formwork sleeve forming member according to the first invention includes a sleeve plate that can be bent in one direction and can form a cylindrical sleeve, and a holder that holds the sleeve plate in a cylindrical shape at both ends. A concrete formwork sleeve forming member having
The holder has a first member provided with a guide groove in which an annular part is cut out and the sleeve plate can be inserted into or removed from the cut-out end, and the first member is separate from the first member. And is arranged outside the first member, and has an annular second member that holds the sleeve plate in a cylindrical shape between the first member and the first member.

In the sleeve forming method according to the second aspect of the present invention, the first member having a guide groove in which a part of the annular shape is cut out and the sleeve plate can be inserted into or removed from the cut-out end portion is formed on the formwork. While facing the inner wall facing each other, a pair is fixed,
After that, the second member which is separated from the first member and has a larger diameter than the first member and is formed in an annular shape is arranged on the outer periphery of the first member, and is unidirectional. Bending the sleeve plate that is freely bent into a cylindrical shape having a diameter smaller than the annular diameter of the first member,
The sleeve plate bent in the cylindrical shape is positioned inside the annular inner side of the first member fixed to the mold, and one end of the sleeve plate is inserted from the guide groove of the first member. By inserting between the one member and the second member until the other end of the sleeve plate overlaps with one end already inserted between the first member and the second member. ,
A sleeve plate is formed and held in a cylindrical shape between the first member and the second member.

  According to the concrete formwork sleeve forming member according to the first invention having the above-described configuration, the sleeve plate is separated from the guide groove formed in the first member, and the first member and the outer periphery thereof. It is only necessary to insert the sleeve plate between the second members arranged in the cylinder until the both ends of the sleeve plate are overlapped to form a cylindrical shape between the first member and the second member. However, since the first member is not fixed to the second member, a large gap can be formed between the first member and the second member at the beginning of inserting the sleeve plate. The sleeve plate can be inserted between the first member and the second member without and easily. Moreover, the holder is constituted by a first member and a second member which is a separate member, and the first member and the second member are simply processed by cutting a thin steel plate into a strip shape ( Since it can be easily manufactured by pressing or sheet metal processing, it can be manufactured at low cost.

  Further, according to the concrete formwork sleeve forming method according to the second invention having the above-described configuration, the sleeve plate is formed in a cylindrical shape in the formwork in which the reinforcing bars are arranged in a complicated manner. The state can be maintained.

  Further, in the concrete formwork sleeve forming member according to the first aspect of the present invention, a tip is formed in the guide groove portion to guide the sleeve between the first member and the second member through the guide groove. If the guide piece curved inward is provided, the guide plate is more easily guided from the inner periphery of the first member to the guide groove formed in the first member. It can be inserted between the first member and the second member.

  In the concrete formwork sleeve forming member according to the first aspect of the present invention, it is preferable that the first member is formed with a fixing portion for fixing to the formwork.

  Hereinafter, a concrete formwork sleeve forming member according to an embodiment of the present invention and a concrete formwork sleeve forming method using the sleeve forming member will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing the overall configuration of a concrete form sleeve forming member according to an embodiment of the first invention, and FIG. 2 is a diagram showing a first member and a second member constituting the holder shown in FIG. It is a perspective view which shows the structure with a member.

  In FIG. 1 or FIG. 2, 1 is a first member that constitutes one of the holders A of the concrete form sleeve forming member, 2 is a second member that also constitutes the other one of the holders A, Reference numeral 3 denotes a sleeve plate (see FIG. 1) that forms a cylindrical sleeve in combination with the first member 1 and the second member 2 in a state where it can be bent in one direction and is arranged in a concrete formwork.

The first member 1 is in contact with the inner surface to be attached, and has a collar portion (fixed portion) 1A in the form of a cutout in the middle of the ring, and the collar from the inner peripheral end of the collar portion 1A. A support portion 1B is provided that is erected at an angle of about 90 degrees with respect to the portion 1A and holds the sleeve plate 3 from the inside, and is cut out in the middle of the ring. A guide groove 1C for inserting the sleeve plate is formed in the notched portion of the support portion 1B. Further, the support portion 1B that forms one wall of the guide groove 1C is curved inward to form a guide piece 1D that guides when the sleeve plate 3 is inserted. In the portion where the guide piece 1D is formed, a slit 1d is formed between the support portion 1B and the flange portion 1A, and the guide piece 1D can be bent inward. .
And the 1st member 1 which has the said structure has the flat part which forms the ring-shaped groove | channel and the collar part 1A from the strip which has the dimension which match | combined the width | variety of the said collar part 1A, and the height of the support part 1B. It is possible to easily press-mold using a mold having the same.

Further, the second member 2 has a size such that a gap having a dimension at least larger than the thickness dimension of a sleeve plate 3 to be described later is formed as compared with the outer diameter of the support portion 1B of the first member 1. And an annular pipe member having a predetermined length (a length sufficient to hold one end of the sleeve plate 3; specifically, a length of about 2 cm to 5 cm). Has been.
The second member 2 includes a band plate having a width corresponding to the predetermined length and a length obtained by adding an overlap margin to a length equal to the circumferential length of the outer diameter so as to have the outer diameter. It can be formed by spot welding the overlapping portions.

In this embodiment, the first member 1 is formed of an integrally molded product made of plastic.
In addition, the second member 2 may be formed by integrally molding plastic or may be formed by cutting a commercially available plastic pipe.

Also, the first member 1 may be made of plastic or other members such as ceramics, and the material is not particularly limited.
However, in order to implement the first member 1 and the second member 2 at a low cost, it is desirable that the first member 1 and the second member 2 are made of a thin steel plate (so-called “tin plate”) as in the above-described embodiment.

  Further, the sleeve plate 3 disposed between the first member 1 and the second member 2 and forming a sleeve is made of a corrugated plate made of a thin metal plate, and is bent only in a direction perpendicular to the corrugated corrugations. It has a possible configuration, and is configured to be rolled into a roll shape (bent) and appropriately shaped into a rod shape (cylindrical shape). Specifically, as the sleeve plate 3, in this embodiment, a so-called “corrugated plate” made of galvanized (or painted) thin steel plate having a thickness of 0.2 mm to 0.25 mm is used. However, the sleeve plate 3 is not limited to the above-described one, and other materials (for example, plastic) may be used.

  By the way, in terms of size, the sleeve plate 3 has a length equal to the required sleeve length in a direction parallel to the concavo-convex corrugation of the sleeve plate 3, and a direction orthogonal to the concavo-convex corrugation. Has a length substantially equal to the circumferential length of the sleeve (exactly longer than the circumferential length by an overlap margin (one to three ridges of the wave)). These dimensions are appropriately measured in accordance with the dimensions of the concrete form on which the sleeve is to be disposed.

  And it is desirable to form the nail hole 1a at the time of attachment to a formwork in the collar part 1A of the said 1st member 1. FIG. However, in general, in the case of such a thin plate, such a nail hole 1a is not necessarily required because it can be easily penetrated and attached by hitting a nail with a hammer.

The concrete formwork sleeve forming member configured as described above is used as follows, and a predetermined sleeve can be formed in the concrete formwork. That is, as illustrated in FIGS. 3A and 3B,
When the concrete formwork G is formed, before the reinforcing bar 11 is arranged (or after the arrangement), the first member is formed on the inner surfaces 10A and 10B of the opposite walls 10 of the formwork G. 1 using the nail hole 1a (or without using the nail hole 1a) in a state where the support members 1B face each other and in a state where both the upper and lower and left and right positions coincide with each other. Fix with nails or screws (see FIG. 3 (a)). At this time, it is necessary to arrange the reinforcing bars 11 so as not to be positioned between the two first members facing each other.

Then, in the state where the reinforcing bar 11 is arranged in the mold G, the second member arranged so as to overlap the outside of the first member 1 as shown in FIG. 2 so that the sleeve plate 3 is wound small (see FIG. 4A), and both ends of the wound sleeve plate 3 are arranged on the inner surfaces 10 of both walls 10 of the mold G. It positions so that it may be located in the inner peripheral direction of each 1st member 1 which carried out. Instead, in a state where the second member 2 is positioned on the outer peripheral side of the first member 1 in advance, the sleeve plate 3 wound small is positioned on the inner peripheral side of the first member 1. It may be. In such a case, when the length of the sleeve plate 3 is long, for example, when the length of the sleeve plate 3 is 500 cm or more, one second member 2 other than both ends or an appropriate interval is provided. It is desirable to reduce the bending and distortion of the intermediate portion of the sleeve plate 3 by arranging a plurality of them. The number of the second members 2 is not particularly limited.
Thereafter, as shown in FIG. 4A, one end of the sleeve plate 3 wound around the inner periphery of the first member 1 is guided by the guide piece 1D to pass through the guide groove 1C. Then, it is inserted into the guide groove 1C formed between the first member 1 and the second member 2 (see FIG. 4 (a)), and shown in FIGS. 4 (a) and 4 (b). Thus, the sleeve plate 3 is inserted between the first member 1 and the second member 2. In this step, since the second member 2 is not fixed to the first member 1, when the sleeve plate 3 is initially inserted, there is no gap between the first member 1 and the second member 2. A gap is formed to be large and easy to insert.
Then, as shown in FIG. 4B, when the sleeve plate 3 is inserted until the start end 3a and the end end 3b overlap, a cylindrical shape is formed between the first member 1 and the second member 2. A cylindrical sleeve is formed by the sleeve plate 3 (see FIG. 3 (b)) arranged on the surface.
In this state, when concrete K is placed in the concrete formwork G, as shown in FIG. 5, the sleeve (first member 1 (see FIG. 1), second member 2 (see FIG. 1)). , And the place where the sleeve plate 3 is disposed) The desired through-hole B can be formed in the concrete beam or wall by the cylindrical space occupied by the S in the concrete K.

  Further, in a state where the concrete K is solidified, the first member 1 (see FIG. 1) and the second member 2 (see FIG. 1) may be pulled out from the guide groove 1C in the reverse procedure described above.

  As described above, the concrete formwork sleeve forming member according to the present invention includes the first member 1 and the second member 2 and the holder A is formed. Since it can be manufactured simply by processing or the like without any waste in terms of materials, it can be manufactured at low cost and can be provided at low cost.

  The concrete form sleeve forming member and the concrete form sleeve forming method according to the present invention can be used when a sleeve is arranged in a concrete form to form a through hole.

It is a perspective view which shows the whole structure of the sleeve formation member for concrete formwork concerning one Example of this 1st invention. It is a perspective view which shows the structure of the 1st member and 2nd member which comprise the holder shown in FIG. It is a figure which shows the procedure which arrange | positions a 2nd member and a sleeve board between each 1st member already arrange | positioned so that it may face a concrete formwork, (a) is arrange | positioning a 2nd member and a sleeve board as 1st. The figure which shows the state temporarily arrange | positioned inside the member of this, (b) is a figure which shows the state by which the both ends of the sleeve board were each hold | maintained by the said 1st member and the 2nd member. It is a figure which shows the procedure which inserts a sleeve board between the 1st member and the 2nd member, (a) is a figure which shows the state before insertion, (b) is the state which has finished inserting a sleeve board. FIG. It is sectional drawing which cut | disconnected in the direction orthogonal to the longitudinal direction of the sleeve which shows the state by which concrete was laid in the concrete formwork which has arrange | positioned the sleeve.

Explanation of symbols

1 ... 1st member
1B ... Guide groove
2 ... Second member
3 ... Sleeve plate

Claims (4)

A sleeve forming member for a concrete form having a sleeve plate that can be bent in one direction and can form a cylindrical sleeve, and a holder that holds the sleeve plate in a cylindrical shape at both ends,
The holder has a first member provided with a guide groove in which an annular part is cut out and the sleeve plate can be inserted into or removed from the cut-out end, and the first member is separate from the first member. And a second member that is disposed outside the first member and has an annular second member that holds the sleeve plate in a cylindrical shape with the first member. A sleeve forming member for a frame.   The guide groove portion is provided with a guide piece whose tip is curved inward to guide the sleeve between the first member and the second member through the guide groove. The concrete formwork sleeve forming member according to claim 1.   3. The concrete formwork sleeve forming member according to claim 1 or 2, wherein a fixing portion for fixing to the formwork is formed on the first member. A first member having a guide groove in which a part of the annular shape is notched and the sleeve plate can be inserted or removed at the notched end is opposed to the inner wall facing the mold. A pair,
After that, the second member which is separated from the first member and has a larger diameter than the first member and is formed in an annular shape is arranged on the outer periphery of the first member, and is unidirectional. Bending the sleeve plate that is freely bent into a cylindrical shape having a diameter smaller than the annular diameter of the first member,
The sleeve plate bent in the cylindrical shape is positioned inside the annular inner side of the first member fixed to the mold, and one end of the sleeve plate is inserted from the guide groove of the first member. By inserting between the one member and the second member until the other end of the sleeve plate overlaps with one end already inserted between the first member and the second member. ,
A method for forming a sleeve for a concrete mold, comprising forming and holding a sleeve plate in a cylindrical shape between the first member and the second member.

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