JP2935842B1 - Method of arranging sleeve tube for forming through hole between molds, and sleeve tube suitable therefor - Google Patents

Abstract

A method of arranging a sleeve tube at a desired position between two facing frame members in a state in which a large number of reinforcing bars are arranged between the reinforcing bars through a gap between the reinforcing bars and a method suitable for the method. Provide a sleeve tube. SOLUTION: The sleeve tube is composed of a large-diameter cylindrical material 51 and a small-diameter cylindrical material 56, each of which is constituted by a plurality of divided pieces cut in the axial direction and can be nested with each other.
Make up 50. Each divided piece is brought into the space between the form materials through the gap between the plurality of reinforcing bars, and the sleeve tube 50 is assembled between the form materials. All of the divided pieces are fixed using the adhesive tape 59. A fitting for engaging with the open end of the sleeve tube 50 is installed on each of the facing formwork surfaces,
First, one open end of the sleeve tube 50 is connected to one fitting. Thereafter, the remaining open ends of the sleeve tube 50 are connected to the other fitting by sliding the two cylindrical members together to extend the sleeve tube 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve tube used for casting a concrete wall having a through hole and a method of fixing such a sleeve tube to a formwork.

[0002]

2. Description of the Related Art When a concrete wall having a through hole is cast and formed, a cylindrical sleeve tube is fixed between two oppositely arranged form members, and a concrete wall is formed between the form members. Is poured. Since the sleeve tube is fixed on the concrete wall at the position between the formwork materials corresponding to the position where the through hole is to be formed, after the concrete poured between the formwork materials is solidified, the sleeve tube is removed. By removing, a through hole can be provided at a desired position on the concrete wall.

[0003] In the case of a beam formwork in particular, the number of the main bars and the stirrups arranged between the opposing formwork members is larger than that between the formwork members for forming the floor and the wall, and therefore, ,
The spacing between the rebars is also small. In such a beam formwork, it is impossible to bring a large-diameter sleeve tube into the space between the formwork materials after the arrangement of the reinforcing members between the formwork materials is completed, and this problem is solved. For this purpose, various methods have been proposed.

A balloon type sleeve tube shown in FIG.
10 is an example. The sleeve tube 10 includes a rubber air sleeve body 11 and a protective cover 12. FIG. 1 shows a state in which the air sleeve body 11 is filled with air. In actual use, first, the air sleeve body 11
The inside is filled with air about halfway and is deflated and fixed at a desired position in the gap between the reinforcing bars with a holder. Thereafter, the air sleeve body 11 is filled with air from the air filling hole 14 by using a compressor, thereby expanding the expanded air sleeve body.
11 is pressed against the opposing formwork members. The sleeve tube 10 is securely fixed at a desired position by the press-contact force of the air and the holder. After placing concrete, bleed air from the air vent hole 13 exposed from the concrete wall,
The sleeve tube 10 is removed.

However, the sleeve tube 10 shown in FIG.
Several problems remain to be improved, such as the expensive sleeve tube itself and the need to provide an air compressor during actual use.

[0006] The sleeve tube 20 shown in FIG.
FIG. 1 is a perspective view showing a state buried in a concrete wall 28 after casting, which is shown in Japanese Patent Publication No. 095. This sleeve tube is a divided piece obtained by dividing one sleeve tube into two.
21 and 22, and moldings 24 and 25 for connecting both divided pieces. In this example, since the sleeve tube is divided into two, it is easier to pass each divided piece between the reinforcing bars than to pass one sleeve tube through the gap between the reinforcing bars. The divided pieces 21 and 22 are connected to each other after being passed through the gap between the reinforcing bars, and are fixed using the moldings 24 and 25. FIG. 3 shows a sectional view of the sleeve tube 20 in an assembled state.

In the sleeve tube 20 shown in FIG. 2, it is easy to pass the divided pieces 21 and 22 through the gaps between the reinforcing bars, but the entire length of each divided piece is between the form members arranged opposite to each other. Since the distance is almost the same, it becomes difficult to fix the sleeve tube to the form material. Even if an attempt is made to nail the sleeve tube 20 to the formwork material, a large number of reinforcing bars are in the way and the hammer cannot be swung as desired. In actuality, a nail is nailed on the surface of the form material using a special J-shaped nailing machine. Further, as can be seen from the cross-sectional view of FIG. 3, each of the divided pieces 21 and 22 is not simply obtained by dividing one sleeve tube, but is obtained by using the moldings 24 and 25.
It is processed into a special shape so that it can be connected.

As described above, the sleeve tube 20 shown in FIGS. 2 and 3 is formed by specially processing each member constituting the sleeve tube 20 and is inconvenient to fix to the form material. There are many drawbacks, such as the need for a special nailing machine.

In the conventional example shown in FIGS. 4 and 5,
First, the extensible rod-shaped holder 31 is fixed between the two facing frame members 35, 35. The rod-shaped holder 31 is formed by disposing a spring material inside two tubular bodies fitted in a telescopic manner, and is fixed between the form materials by its spring force. Next, with respect to the rod-shaped holder 31 fixed between the mold members, FIG.
A plurality of short columnar foam materials 32 shown in (1) are fixed one after another, and finally a structure like a single sleeve tube is formed. Each of the foam materials 32a to 32d is formed with a hole 34 penetrating the center of the column and a slit 33 extending from the circumferential surface to the hole 34. Each foam material is engaged with the rod-shaped holder 31 from the slit 33, and finally, the rod-shaped holder 31 is located in the hole 34.

In the conventional example shown in FIGS. 4 and 5,
It is necessary that the total length of the plurality of cylindrical foam materials 32 is exactly equal to the interval between the formwork materials 35, 35, but in many cases,
It will be necessary to cut the last foam to the required length and adjust the total length. Thus, there remains a disadvantage that extra processing work is required on site.

[0011]

SUMMARY OF THE INVENTION Accordingly, the technical problem to be solved by the present invention is that a plurality of reinforcing bars are arranged at a desired position between two facing form members in a state where the reinforcing bars are arranged therebetween. An object of the present invention is to provide a method for arranging a sleeve tube through a gap between muscles and a sleeve tube suitable for the method.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in order to effectively solve the above-mentioned problems.
An object of the present invention is to provide a method for arranging a sleeve tube for forming a through hole having the following features.

[0013] That is, in the method of the present invention, first, "a large-diameter cylindrical material and a small-diameter cylindrical material which can be telescopically combined with each other are divided into a plurality of divided pieces by cutting each in the axial direction." And "Large-diameter collar with the same diameter as the large-diameter cylinder" and "Small-diameter collar with the same diameter as the small-diameter cylinder"
Are brought into the space between the form materials through the gaps between the plurality of reinforcing bars.

In the space between the frame members, the large-diameter collar is used as a guide to assemble and fix the divided pieces on the inner peripheral side to form a small-diameter cylindrical material, and the large-diameter collar is fixed to the outer peripheral surface at one end of the small-diameter cylindrical material. . Furthermore, using the assembled small-diameter cylindrical material as a guide, the divided pieces are assembled and fixed on the outer peripheral side to form a large-diameter cylindrical material, and the small-diameter collar is fixed to the other inner peripheral surface of the large-diameter cylindrical material to form a through hole. Sleeve tube.
The fixing of the divided pieces and the fixing of each cylindrical member and the collar are all performed using an adhesive tape.

Next, fittings that can be engaged with the open ends of the sleeve tubes are respectively set on the surfaces of the facing form members. One open end of the sleeve tube is first connected to one fitting, and then the other open ends of the sleeve tube are connected to the other fitting by sliding both cylinders together to extend the sleeve tube. . This completes the arrangement of the sleeve tube between the form members.

In the method of the present invention, the large-diameter and small-diameter cylindrical members constituting the sleeve tube are each divided in the axial direction, and each divided piece is passed through a narrow gap between the reinforcing bars to form a space between the form members. The cylindrical member can be assembled from each of the divided pieces in the space, and further, the sleeve tube can be assembled. Therefore, even if the diameter of the finally assembled sleeve tube is large, each divided piece can easily pass through the gap between the reinforcing bars. Therefore,
Normally, even a large-diameter sleeve tube that cannot be inserted between the form members through the arrangement of reinforcing bars can be fixed at a desired position between the form members.

Further, since the fixing of the divided pieces and the fixing of each of the cylindrical members and the collar are all performed by using an adhesive tape, each of the divided pieces and the collar has a special shape in order to fix them to each other. No need to process. Furthermore, since the sleeve tube after assembly is made of a large-diameter cylindrical material and a small-diameter cylindrical material, which are telescopically combined with each other and made to be expandable and contractible, they are fixed to the surfaces of both facing frame members. After connecting one end of the sleeve tube to one of the fittings and then connecting the other end to the other fitting while extending the sleeve tube, the sleeve tube can be easily made orthogonal to the formwork surface. Can be fixed in state. That is, it is not necessary to nail the sleeve tube directly to the form material.

The above-mentioned mounting device has a cylindrical connecting portion which can be fitted to the inner peripheral surface of a small-diameter cylindrical material or a small-diameter collar on the surface of a flat substrate, and is fixed to the surface of the form material on the rear surface of the flat substrate. Is preferred. When a through-hole forming sleeve tube is arranged using such a fixture,
Since the fitting also functions as a lid member for closing the open end of the sleeve tube, it is possible to effectively prevent concrete from flowing into the sleeve tube.

Further, it is preferable that a fixing stud is provided on the back surface of the flat substrate of the mounting fixture. In this case, when the attachment is pressed against the surface of the form material, the studs bite into the surface of the form material, so that the positioning of the attachment on the surface of the form material is simplified. Furthermore, without using separate nails,
The fixture itself can be fixed to the formwork by hitting it with a hammer.
Moreover, since the stroke of the hammer is sufficient to be 2 to 3 cm, it is particularly convenient when it is difficult to swing the hammer largely due to the large number of reinforcing bars arranged between the form members.

Further, according to the present invention, a large-diameter cylindrical material and a small-diameter cylindrical material are mutually nested, and each cylindrical material is fixed with a plurality of divided pieces cut in the axial direction with an adhesive tape. The present invention provides an extendable sleeve tube for forming a through hole. In this sleeve tube, at one end, a "large-diameter collar having the same diameter as the large-diameter cylindrical material" is fixed to the outer peripheral surface of the small-diameter cylindrical material with an adhesive tape, and at the other end, the "large-diameter collar" is attached to the inner peripheral surface of the large-diameter cylindrical material. The "small diameter collar of the same diameter as the small diameter cylindrical material" is fixed with adhesive tape.

[0021] The sleeve tube of the present invention having the above structure is
When assembling the same, the large diameter collar is used as a guide to assemble and fix the divided pieces on the inner peripheral side to form a small diameter cylindrical material. Then, the large-diameter collar is fixed to the outer peripheral surface at one end of the small-diameter cylindrical material. Further, using the assembled small-diameter cylindrical material as a guide, divided pieces are assembled and fixed on the outer peripheral side thereof to obtain a large-diameter cylindrical material. Finally, the small-diameter collar is fixed to the inner peripheral surface at the other end of the large-diameter cylindrical material. The fixing of each of the divided pieces and the fixing of each cylindrical member and the collar are all performed using an adhesive tape.
Therefore, this sleeve tube is particularly advantageous for use in the sleeve tube placement method of the present invention described above.

The number of divisions of each cylinder (ie, the number of divisions used to construct one cylinder) is such that the larger the number, the smaller the size of each division.
The work of passing through the gap between the reinforcing bars is facilitated.

Further, according to the present invention, a "split piece forming a large-diameter cylindrical material", a "split piece forming a small-diameter cylindrical material", a "split piece forming a small-diameter cylindrical material" used for assembling the above-described sleeve tube for forming an extendable through hole. A sleeve tube assembly kit is provided that includes a "diameter collar" and a "small diameter collar". Preferably, the assembly kit also includes an adhesive tape used to secure each member during assembly.

[0024]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 6 is a perspective view of a sleeve tube 50 according to one embodiment of the present invention. Sleeve tube
Reference numeral 50 denotes a combination of a large-diameter cylindrical member 51 and a small-diameter cylindrical member 56 which are nested with each other. The inner diameter of the large-diameter cylindrical member 51 and the outer diameter of the small-diameter cylindrical member 56 are substantially equal, and both can slide without rattling with each other, whereby the entire sleeve tube 50 expands and contracts.

At one end of the sleeve tube 50, a large-diameter collar 57 having the same diameter as the large-diameter cylindrical member 51 is fixed to the outer peripheral surface of the small-diameter cylindrical member 56. Also, at the other end of the sleeve tube 50,
A small-diameter collar 52 having the same diameter as the small-diameter cylindrical member 56 is fixed to the inner peripheral surface of the large-diameter cylindrical member 51. The function of each color 52, 57 will be described later.

The large-diameter cylindrical member 51 and the small-diameter cylindrical member 56 are each formed by assembling a plurality of divided pieces obtained by cutting one cylindrical member in the axial direction. The assembling procedure will be described with reference to FIGS.

FIG. 7 is an explanatory view showing a state where the sleeve tube 50 of FIG. 6 is disassembled. The large-diameter cylindrical member 51 includes two divided pieces 51a and 51b cut in the axial direction. Similarly, the small-diameter cylindrical member 56 is also divided into two divided pieces in the axial direction.
It is composed of 56a and 56b. A ring 57 shown on the lower left side in FIG. 7 is a large-diameter circular collar fixed to the outer peripheral surface of the small-diameter cylindrical material 56, and a ring 52 shown on the upper right side is an inner peripheral surface of the large-diameter cylindrical material 51. It is a small diameter collar that is fixed to

First, using the large-diameter collar 57 as a guide, the small-diameter cylindrical member 56 is constructed by combining the divided pieces 56a and 56b on the inner peripheral surface side (see FIG. 8). It is preferable to fix the two divided pieces 56a and 56b using an adhesive tape 59 such as a gum tape or kraft paper. The small-diameter cylindrical member 56 and the large-diameter collar 57 are also fixed to each other with an adhesive tape. The large-diameter collar 57 functions as an assembly guide for the small-diameter cylindrical
It also has the function of maintaining a perfect circle of 56 and as a reinforcing material.

Next, using the assembled small-diameter cylindrical member 56 as a guide, the large-diameter cylindrical member 51 is formed by combining the divided pieces 51a and 51b on the outer peripheral surface side. Finally, the large-diameter cylindrical material 51
The small-diameter collar 52 is fixed to the inner peripheral surface side of (2) (see FIG. 9). Thus, the assembly of the sleeve tube 50 is completed. Each divided piece 51a, 51
The fixing of b and the fixing of the small-diameter collar 52 are also performed using the adhesive tape 59 in the same manner as described above. The location to be fixed by the adhesive tape 59 is not limited to the position shown in the figure, and may be appropriately selected as needed.

The actual assembly of the sleeve tube 50 is performed in the space between the facing frame members as described later.

FIGS. 10 and 11 respectively show examples of fittings used when fixing the above-mentioned sleeve tube 50 between the form materials. All of these fixtures fixed to the surface of the mold material have already been applied for a patent by the present applicant, and the fixture 60 in FIG. 10 is disclosed in Japanese Patent Laid-Open No. 7-10235, and FIG. The mounting tool 65 is disclosed in Japanese Patent Application Laid-Open No. Hei 3-17352.

In the fixture 60 shown in FIG. 10, a cylindrical connecting portion 62 protrudes from the surface of a disk-shaped substrate 61, and a peripheral portion 61 of the substrate 61 is provided.
“a” extends outward beyond the cylindrical connecting portion 62 in a flange shape. At the center of the substrate 61, and at three positions at equal intervals along the inner peripheral surface of the cylindrical connecting portion 62,
Four holes 63a to 63d for nailing are formed in total. Normally, only one nail 64 is used, and the fixture 60 can be fixed to the surface of the form material with sufficient strength by driving the nail 64 through the central nailing hole 63a. However, by driving nails into other nailing holes as necessary,
Further, the fixture 60 can be fixed more firmly.

The fixture 65 shown in FIG. 11 has the same basic structure as the fixture 60 shown in FIG. 10, but is used for fixing the fixture 65 to the surface of the form material from the back side of the flat substrate. The difference is that the stud 66 is formed to project. When the mounting fixture 65 is pressed onto the surface of the form material, each of the studs 66 bites, so that the positioning on the surface of the form material is easy. Furthermore, it can be fixed to the form material only by hitting with a hammer without using a separate nail. At this time, it is not necessary to swing the hammer large, and if a stroke of 2 to 3 cm can be taken, it is convenient because it can be sufficiently hit and fixed. It should be noted that the fixture 65 also has the same nailing holes as the fixture 60, so that if necessary, the fixture 65 can be further firmly fixed using a nail.

If the fixture cannot be fixed to the surface of the mold using nails or studs, such as when the mold is made of steel, the fixture 60 shown in FIG. It is preferable that the attachment 60 is fixed to the surface of the form material with a double-sided adhesive tape made of cloth.

Next, a procedure for fixing the sleeve tube 50 between two facing frame members will be described with reference to FIGS. First, as shown in FIG. 12, two opposite formwork materials
The fixtures 65 (may be the fixtures 60) are fixed to the surfaces of the respective 70s as described above. In each of the drawings, the space between the mold members 70 is provided with the fixture 65 and the sleeve tube.
Although only 50 is shown, a large number of reinforcing bars such as a main bar and a stirrup are actually arranged.

Next, a sleeve tube is attached to one of the fixtures 65.
Connect one end of 50. This sleeve tube 50 is shown in FIG.
As shown in (1), the disassembled material is carried between the form members through the gaps between the reinforcing bars, and then assembled in the space between the form members according to the above-described steps. In FIG. 13, one end of the sleeve tube 50 to which the large-diameter collar 57 is fixed is first connected to the fixture 65, but the other end to which the small-diameter collar 52 is fixed is first attached to the fixture 65. They may be connected. Since the small-diameter collar 52 has an inner diameter equal to the inner diameter of the small-diameter cylindrical member 56, by fixing it to the inner peripheral surface side of the large-diameter cylindrical member 51, the inner diameter of the sleeve tube 50 becomes equal at both ends. Therefore, both ends of the sleeve tube 50 can be fixed to the surface of the form material by using the same mounting tool. Further, the small-diameter collar 52 also has a function of maintaining a perfect circle of the large-diameter cylindrical member 51 and reinforcing the same.

Finally, the sleeve tube 50 is extended from the state shown in FIG. 13, and the other end is connected to the other fixture 65.
At this time, a finger is hooked on the edge 57a of the large-diameter collar 57 and the edge 51a of the large-diameter cylindrical member 51 (see FIG. 14), and a force is applied in a direction in which the two members are separated from each other. A series of operations such as extension and connection to the fixture 65 can be easily performed. Also, the sleeve tube 50 is directly
There is no need for complicated work such as nailing. Finally,
It is preferable that the sleeve tube 50 in the expanded state can be held in that state, and is fixed with an adhesive tape so that the sleeve tube 50 does not return and become short.

As described above, when concrete is poured between the form members to which the sleeve tube 50 is fixed and solidified, a concrete wall having a through hole at a position corresponding to the sleeve tube 50 can be formed. The sleeve tube 50
After the concrete has solidified, it is removed using a bar or the like. As can be seen from FIG. 14, since each fixture 60 also has a function as a lid member for closing the open end of the sleeve tube 50, the concrete poured between the form materials flows into the sleeve tube 50. Can be effectively prevented.

The length of each of the large-diameter cylindrical member 51 and the small-diameter cylindrical member 56 is not particularly limited in the present invention. However, since two cylindrical members are used in combination, half the distance between the form members. Clearly, it must not be: Also, as shown in FIG. 14, it is important from the viewpoint of strength that a certain degree of overlap is ensured even when the sleeve tube 50 is in the most extended state. In view of this, the length L (mm) of each of the cylindrical members 51 and 56 when the space between the form members is B (mm) is set to be at least a value obtained by the formula L = (B + 100) / 2. It is preferable to use as a guideline. Further, the length of the large-diameter collar 57 and the small-diameter collar 52 is preferably about 25 mm. The overall length of the sleeve tube 50 in the most contracted state is the sum of the length of the cylindrical member and the length of the collar.

In the above description, the large-diameter cylindrical member 51 and the small-diameter cylindrical member 56 are each divided into two divided pieces. However, in the present invention, the number of divisions is not particularly limited. It is preferable to increase the number of divisions as the diameter of the assembled sleeve tube increases. The reason is that as the number of divisions increases, the size of each division piece decreases,
Therefore, it is easy to bring the material into the space between the form materials through the gap between the reinforcing bars.

For reference, the approximate values of the dimensions of each divided piece in each of two divisions, three divisions, and four divisions are shown in Table 1 below. FIG. 15 shows the positions of H and W in Table 1 indicating the dimensions.

[Table 1]

It is preferable that each divided piece constituting the cylindrical member of the sleeve tube of the present invention is formed by cutting a single cylindrical member by sawing or the like. Then, each of the divided pieces thus formed is assembled by the above-described method, and is fixed with an adhesive tape to be restored as a cylindrical material. That is, each of the divided pieces can be easily and economically manufactured, unlike the conventional one (see FIGS. 2 and 3) obtained by performing a special processing on a portion to be connected to each other.

Each cylindrical member is preferably made of a material such as paper or PVC which is relatively easy to cut by sawing or the like. In the sawing, it is preferable that two large-diameter and small-diameter cylindrical members are fitted to each other, combined, temporarily fixed with an adhesive tape or the like, and cut and divided at the same time.

In the present invention, the divided pieces and the collars constituting the sleeve tube are not assembled in a state of being fixed as a sleeve tube with an adhesive tape, but are sold as an assembly kit in a disassembled state as shown in FIG. Is preferred. In FIG. 7, each cylindrical member is divided into two, but the number of divisions is not limited to two. Preferably, the assembly kit also includes an adhesive tape.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a conventional sleeve tube for forming a through hole.

FIG. 2 is a perspective view showing another example of a conventional sleeve tube for forming a through hole. Concrete walls are also shown.

FIG. 3 is a sectional view taken along a line perpendicular to the axis of the sleeve tube of FIG. 2;

FIG. 4 is a perspective view showing still another example of a conventional sleeve tube for forming a through hole.

FIG. 5 shows one of the foam materials used in the conventional example of FIG.
FIG.

FIG. 6 is a perspective view showing an example of the sleeve tube of the present invention.

FIG. 7 is an explanatory view showing a state where the sleeve tube of FIG. 6 is disassembled.

FIG. 8 is an explanatory diagram illustrating an assembling procedure from the state of FIG. 7;

FIG. 9 is an explanatory diagram illustrating an assembling procedure from the state of FIG. 7;

FIG. 10 is a perspective view showing an example of a sleeve tube fitting used in the present invention.

FIG. 11 is a perspective view showing another example of the sleeve tube fitting used in the present invention.

FIG. 12 is an explanatory diagram illustrating a procedure for fixing the sleeve tube of FIG. 6 between form materials.

FIG. 13 is an explanatory diagram illustrating a procedure for fixing the sleeve tube of FIG. 6 between form materials.

FIG. 14 is an explanatory view illustrating a procedure for fixing the sleeve tube of FIG. 6 between form materials.

FIG. 15 is an explanatory diagram illustrating H and W in Table 1 in the specification.

[Explanation of symbols]

 10 Sleeve tube 11 Air sleeve body 12 Protective cover 13 Air vent hole 14 Air filling hole 20 Sleeve tube 21, 22 Split piece 24, 25 Mall 28 Concrete wall 31 Bar holder 32, 32a, 32b, 32c, 32d Foam 33 Slit 34 Hole 35 Formwork 50 Sleeve tube 51 Large diameter cylinder 51a, 51b Split piece 52 Small diameter collar 56 Small diameter cylinder 56a, 56b Split piece 57 Large diameter collar 59 Adhesive tape 60 Mounting bracket 61 Substrate 61a Substrate flange 62 Cylindrical Connections 63a-d Nail holes 64 Nail 65 Mounting fixture 66 Tack 70 Formwork

Claims (5)

(57) [Claims] 1. A sleeve tube (50) for forming a through hole is provided between two form members (70) provided opposite to each other with a large number of reinforcing bars arranged therebetween. Large diameter cylindrical material that can be nested with each other
(51) and the small-diameter cylindrical material (56) are each cut in the axial direction and divided into a plurality of divided pieces (51a, 51b, 56a, 56b).
And a large-diameter collar (57) having the same diameter as the large-diameter cylindrical material, and a small-diameter collar (52) having the same diameter as the small-diameter cylindrical material, through a gap between a plurality of reinforcing bars to the space between the formwork materials (70). Bring the large-diameter collar (57) as a guide
a, 56b) are assembled and fixed to form a small-diameter cylindrical material (56), a large-diameter collar is fixed to the outer peripheral surface at one end of the small-diameter cylindrical material, and the assembled small-diameter cylindrical material (56) is further used as a guide. At the side, the divided pieces (51a, 51b) are assembled and fixed to form a large-diameter cylindrical material (51), and a small-diameter collar (52) is fixed to the inner peripheral surface of the other end of the large-diameter cylindrical material to form a through-hole forming sleeve. A tube (50), and all of the fixings are performed using an adhesive tape (59), and a fitting (60) engageable with the open end of the sleeve tube (50).
Are placed on the surfaces of the facing formwork members (70), respectively, and one open end of the sleeve tube (50) is first attached to one of the mounting members.
(60), and then, by sliding the two cylindrical members together to extend the sleeve tube (50), thereby connecting the remaining open end of the sleeve tube (50) to the other fitting. Features method. 2. The small-sized cylindrical member (56), wherein the fittings (60, 65) are provided.
Alternatively, a cylindrical connecting portion (62) that can be fitted to the inner peripheral surface of the small-diameter collar (52) is provided on the surface of the flat substrate (61), and the frame material (70 2. The method according to claim 1, wherein the method is fixed to a surface. 3. A fixing stud (66) is provided on a back surface of the flat board (61) of the mounting tool (65).
The method of claim 2. 4. A sleeve tube (50) for forming an extendable through-hole, comprising a large-diameter cylindrical material (51) and a small-diameter cylindrical material (56) which are telescopically combined with each other. Is formed by fixing a plurality of divided pieces (51a, 51b, 56a, 56b) cut in the axial direction with an adhesive tape (59), and a small-diameter cylindrical material (56) is provided at one end of the sleeve tube (50). Large-diameter collar (57) with the same diameter as large-diameter cylindrical material is adhesive tape on the outer peripheral surface of
(59), and at the other end a large-diameter cylindrical material (5
A sleeve tube for forming a through hole, characterized in that a small-diameter collar (52) having the same diameter as the small-diameter cylindrical material is fixed to the inner peripheral surface of 1) with an adhesive tape (59). 5. A divided piece (51a, 51b) constituting a large diameter cylindrical material and a divided piece (56a, 5b) constituting a small diameter cylindrical material used for assembling the sleeve tube for forming a through hole according to claim 4.
6b) Sleeve tube assembly kit including large diameter collar (57) and small diameter collar (52).