JP2004027554A - Through hole forming tool for fire resistant structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To advantageously perform fire resistant structure work for a through hole in terms of cost and efficiency by rationally remodeling a sleeve embedded for forming the through hole for a pipe in a pipe-expected position of a concrete structure. <P>SOLUTION: The sleeve 3 is embedded for forming the through hole 2 for the pipe in the pipe-expected position of the concrete structure 1, and is manufactured from a thermally expansive heat resistant resin for substantially blocking up the pipe-inserted through hole 2 by the thermal expansion. The sleeve 3 forms a blocking-up part 3A for blocking up or almost blocking up clearance S formed between an inner peripheral surface and an outer peripheral surface of the pipe in a pipe axis X directional specific position by contacting with or approaching the outer peripheral surface of the pipe P inserted into the through hole 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an improvement in technology for forming a through hole for piping formed in a wall or floor of a concrete structure into a fire prevention structure.
[0002]
[Prior art]
Conventionally, a cylindrical paper sleeve was attached to a concrete formwork for constructing a concrete structure to form a through hole for piping at a planned pipe location, concrete was poured in this state, and after curing, the concrete mold was The frame is removed and the paper sleeve is removed, and as shown in FIG. 15, a through hole 2 for piping is formed in the concrete structure 1.
[0003]
Next, after the piping work for the through hole 2 of the concrete structure 1, it can be freely inserted into the annular space between the inner peripheral surface of the through hole 2 and the outer peripheral surface of the pipe P inserted therethrough from the pipe axial direction. And a putty holding frame portion 50A for cylindrically mounting a thermally expandable sheet-like putty 51 for closing the through hole 2 after the pipe has been inserted by thermal expansion in the event of a fire, and an opening peripheral portion of the through hole 2. Is mounted, and the flange portion 50B of the putty holding bracket 50 is fixed to the opening peripheral portion of the through hole 2 with a screw 52.
[0004]
The putty holding bracket 50 is composed of a pair of divided holding frames that are swingably opened / closed or slidably opened / closed in the circumferential direction so as to be able to cover the pipe P inserted into the through hole 2.
[0005]
[Problems to be solved by the invention]
Conventionally, there is a construction restriction that the construction for making the piping through hole into a fire-resistant structure cannot be performed until after the pipe work, and when performing the fire-resistant structure construction, a putty holding metal fitting 50 is required. Attaching the thermally expandable sheet-like putty 51 to the putty holding frame portion 50A, the putty holding frame portion 50A of the putty holding bracket 50 is attached to the inner circumferential surface of the through hole 2 and the outer circumferential surface of the pipe P inserted through the through hole 2. And the step of fixing the flange portion 50B of the putty holding metal fitting 50 to the peripheral edge of the opening of the through hole 2 with the screw 52, and the putty holding metal fitting 50 However, since it is necessary to use a complex structure of a two-segment type that can be swingably opened and closed or slidably opened and closed in the circumferential direction, much work is required for the construction, and the construction cost is likely to increase.
[0006]
The present invention has been made in view of the above-mentioned situation, and its main problem is that a reasonable modification at the time of constructing a concrete structure allows cost-effective and efficient construction of a fire-resistant structure for a through-hole. Another object of the present invention is to provide a through hole forming tool for a refractory structure that can be advantageously implemented in terms of surface.
[0007]
[Means for Solving the Problems]
A feature of the through hole forming tool for a fireproof structure according to claim 1 of the present invention is that a sleeve buried to form a through hole for a pipe at a planned pipe portion of a concrete structure is inserted through a pipe by thermal expansion. The through-hole is made of a heat-expandable heat-resistant resin that can be substantially closed, and the sleeve is formed between the outer-peripheral surface of the piping and the outer-peripheral surface of the piping in contact with or close to the outer peripheral surface of the piping inserted into the through-hole Is that a closed portion that closes or substantially closes the gap to be formed at a specific position in the pipe axis direction is formed.
[0008]
According to the above characteristic configuration, when constructing a concrete structure, the thermal expansion that can substantially close the through hole after the pipe is inserted by the thermal expansion of the sleeve itself buried in the place where the pipe through hole is to be formed. Since construction of concrete structures is completed at the same time as construction of concrete structures, fire-resistant construction work for piping through holes is also substantially completed. This eliminates the need for complicated and time-consuming removal work such as removing the paper sleeve after the construction, and also eliminates the need for complicated two-piece putty holding hardware and reduces the time and effort required to install it. it can.
[0009]
Furthermore, by simply inserting the pipe into the sleeve buried in the concrete structure, the closed portion formed on the sleeve comes into contact with or close to the outer peripheral surface of the pipe, and is formed between the outer peripheral surface of the pipe and the outer peripheral surface of the pipe. Can be closed or almost closed at a specific position in the pipe axis direction, so that when a fire occurs, smoke enters other places through the gap formed between the inner peripheral surface of the sleeve and the outer peripheral surface of the pipe. Can be suppressed.
[0010]
Therefore, by rationally devising the sleeve buried to form the piping through-hole at the planned piping location of the concrete structure as described above, the labor and materials required for the fire-resistant construction of the piping through-hole can be reduced. Since it is possible to greatly reduce the construction time and reduce the restriction on the construction period, it is possible to carry out the fire resistant construction work advantageously in terms of cost and efficiency.
[0011]
According to a second aspect of the present invention, there is provided a through hole forming tool for a refractory structure, wherein at least one end of the sleeve in the pipe axis direction is provided with a mounting portion for a concrete formwork for constructing a concrete structure. On the point.
[0012]
According to the above-described characteristic configuration, the number of members for attaching the sleeve to the concrete form is reduced, and it is possible to promote the cost reduction and the efficiency of the fireproof construction work for the piping through-hole.
[0013]
A feature of the through hole forming tool for a refractory structure according to a third aspect of the present invention is that a retaining projection embedded in a concrete structure is formed on an outer peripheral surface of the sleeve.
[0014]
According to the above-mentioned characteristic configuration, an external force in the pipe axial direction is applied to the sleeve in contact with the inserted pipe while providing the sleeve with a closing member that is in contact with or close to the outer peripheral surface of the pipe inserted into the through hole of the sleeve. Even if it acts, this external force can be received at the embedded portion between the retaining projection formed on the outer peripheral surface of the sleeve and the concrete structure, so that the sleeve is securely held at the predetermined embedded position of the concrete structure. can do.
[0015]
A characteristic configuration of the through hole forming tool for a refractory structure according to claim 4 of the present invention is that the sleeve is configured to be the same as or larger than the axial length of the piping through hole.
[0016]
According to the above-mentioned characteristic configuration, when the sleeve is configured to have the same axial length as the piping through-hole, it is suitable for forming the piping through-hole in the wall of the concrete structure, and When the sleeve is configured to be longer than the axial center length of the piping through hole, it is suitable for forming the piping through hole in the floor of a concrete structure.
[0017]
A characteristic configuration of the through hole forming tool for a refractory structure according to claim 5 of the present invention is that the closing portion is configured to be elastically deformable radially outward of the sleeve.
[0018]
According to the above configuration, even when the inner diameter of the closed portion formed in the sleeve is set to the set minimum outer diameter of the pipe inserted into the through hole of the sleeve, when the pipe having the set maximum outer diameter is inserted, The closing portion elastically deforms radially outward of the sleeve with the contact with the pipe.
[0019]
Therefore, regardless of fluctuations in the outer diameter of the pipe, the closed portion formed in the sleeve is brought into contact with the outer peripheral surface of the pipe inserted therein, so that when a fire occurs, smoke is generated between the inner peripheral surface of the sleeve and the outer peripheral surface of the pipe. Can be reliably prevented from intruding into other places through the gap formed in the gap.
[0020]
A characteristic configuration of the through-hole forming tool for a refractory structure according to claim 6 of the present invention is that the closing portions are formed at a plurality of positions in the tube axis direction of the sleeve.
[0021]
According to the above-mentioned characteristic configuration, each of the closed portions formed at a plurality of locations in the pipe axis direction of the sleeve is in contact with or close to the outer peripheral surface of the pipe. Can be blocked or almost blocked at multiple positions in the axial direction, and in the event of a fire, it is possible to prevent smoke from entering other locations through the gap formed between the inner peripheral surface of the sleeve and the outer peripheral surface of the pipe. can do.
[0022]
A feature of the through hole forming tool for a fireproof structure according to claim 7 of the present invention is that a length changing means for changing a length of the sleeve in the axial direction is provided.
[0023]
According to the above-mentioned characteristic configuration, the axial length of the sleeve can be changed according to the thickness of the planned pipe portion of the concrete structure. Therefore, the axial length differs depending on the thickness of the planned pipe portion. There is no need to prepare a plurality of types of sleeves, and it is possible to promote the cost reduction and the efficiency of the fireproof construction work for the through hole for piping.
[0024]
A characteristic configuration of the through hole forming tool for a refractory structure according to claim 8 of the present invention is that the length changing means is configured to fit a pair of split sleeve bodies constituting a sleeve so as to be able to expand and contract in the axial direction. It is in the point.
[0025]
According to the above-mentioned characteristic configuration, when changing the axial length of the sleeve in accordance with the thickness of the planned piping portion of the concrete structure, it is only necessary to expand and contract both split sleeve bodies constituting the sleeve in the axial direction. Therefore, the adjustment can be performed quickly and easily while taking a large length change allowance.
[0026]
According to a ninth aspect of the present invention, there is provided a through hole forming tool for a refractory structure according to the present invention, wherein the length changing means is formed by an axially expandable and contractible annular projection formed at an intermediate portion of the sleeve in the axial direction. It is in the point.
[0027]
According to the above-mentioned characteristic configuration, the length of the sleeve in the axial direction is adjusted by the elastic deformation of the annular projection bent and formed at the intermediate portion of the sleeve in the axial direction, so that the length of the sleeve in the axial direction is changed to the scheduled piping location of the concrete structure. The thickness of the sleeve can be freely changed, and the entire sleeve can be integrally formed, so that the manufacturing cost of the sleeve itself can be reduced.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
FIGS. 1 to 5 show a through-hole forming tool for a refractory structure according to the present invention, and a cylinder buried to form a through-hole 2 for a pipe P such as a drain pipe at a scheduled pipe of a concrete structure 1. The sleeve 3 is made of a heat-expandable heat-resistant resin capable of substantially closing the through-hole 2 after the pipe has been inserted by thermal expansion due to heating at the time of fire, and a pipe on the inner peripheral surface 3a of the sleeve 3. At one end in the axis X direction, a gap S formed between the outer peripheral surface of the pipe P elastically in contact with or close to the outer peripheral surface of the pipe P inserted into the through-hole 2 is formed. An annular closing portion 3A that closes or substantially closes at a specific position is integrally formed.
[0029]
At the other end of the outer peripheral surface 3b of the sleeve 3 in the direction of the pipe axis X and at three equally spaced positions in the circumferential direction, nails are attached to the concrete form 4 for constructing the concrete structure 1. A protruding piece-shaped mounting portion 3B provided with a mounting hole 3d for fixing by an appropriate fixing means such as 5 is integrally formed.
[0030]
At the center of the outer peripheral surface 3b of the sleeve 3 in the direction of the pipe axis X and at three equally spaced positions in the circumferential direction, projecting stopper protrusions embedded and fixed in the concrete structure 1 are provided. 3C is integrally formed.
[0031]
The closing portion 3A is formed radially inward of the sleeve 3 and annularly protruding toward the other end in the direction of the pipe axis X, and is brought into contact with the pipe P to be inserted. It is configured to be elastically deformable outward in the radial direction (on the radially enlarged side).
[0032]
Therefore, even when the inner diameter D1 of the closing portion 3A is set to the set minimum outer diameter D2 of the pipe P inserted into the through hole 2 of the sleeve 3, when the pipe P having the set maximum outer diameter D2 is inserted, the pipe P The closing portion 3 </ b> A elastically deforms radially outward of the sleeve 3 with the contact with P.
[0033]
Therefore, regardless of the change in the outer diameter of the pipe P, the closed portion 3A formed in the sleeve 3 is brought into contact with the outer peripheral surface of the pipe P inserted therethrough, so that when a fire occurs, the smoke comes in contact with the inner peripheral surface 3a of the sleeve 3. It is possible to reliably prevent entry into other places through the gap S formed between the pipe P and the outer peripheral surface.
[0034]
The composition of the heat-expandable heat-resistant resin constituting the sleeve 3 contains an inorganic filler such as calcium carbonate, a heat-expandable base material, a rubber component, a synthetic resin, and the like. It has a rigidity and a moderate elastic force that can maintain a predetermined or substantially predetermined sleeve shape.
[0035]
Further, as the thermally expandable base material, expanded graphite, vermiculite, alkali metal silicate and the like can be mentioned, and the thermal expansion ratio of the thermally expandable heat-resistant resin can be arbitrarily set. In the embodiment, it is set in the range of 2 to 20 times.
[0036]
At the other end of the sleeve 3 in the pipe axis X direction, a cap 6 made of a metal or a refractory material for closing the opening when not in use and not inserting the pipe P is detachably fitted from the pipe axis X direction. At one end of the sleeve 3 in the direction of the pipe axis X, a rubber plug 7 with excellent fire resistance for closing the opening when not using the pipe P or when placing concrete shown in FIG. And is fitted and held so as to be detachable from the pipe axis X direction in a state where it is locked to the tip of the pipe.
[0037]
For example, as shown in FIG. 3, when constructing the wall of the concrete structure 1, one of the inner side surfaces 4 a of the left and right concrete forms 4 opposed to the inner side surface 4 a is used for piping. At the place where the through hole 2 is to be formed, a mounting hole 3d formed at the other end of the sleeve 3 made of a heat-expandable heat-resistant resin at the other end in the pipe axis direction X is mounted by a suitable fixing means such as a nail 5 or the like. Concrete is poured between the molds 4, and after curing, the concrete form 4 is removed to construct a heat-resistant concrete wall portion in which the sleeve 3 made of heat-expandable heat-resistant resin is embedded and fixed.
[0038]
Therefore, the sleeve 3 itself buried in the portion of the concrete structure 1 where the pipe through-hole 2 is to be formed is made of a heat-expandable heat-resistant resin capable of substantially closing the through-hole 2 after the pipe P is inserted by thermal expansion. Therefore, the construction of the concrete structure 1 is completed, and at the same time, the construction of the fireproof structure for the piping through hole 2 is substantially completed. There is no need for complicated and time-consuming removal work such as removing the paper sleeve after construction, and there is no need for a complicated two-piece type putty holding bracket, and the labor required for mounting it can be reduced. .
[0039]
Further, as shown in FIG. 5, by simply inserting the pipe P into the sleeve 3 buried in the concrete structure 1, the closed portion 3 </ b> A formed on the sleeve 3 comes into contact with the outer peripheral surface of the pipe P Since the gap S formed between the pipe 3 and the outer peripheral surface of the pipe P can be closed or substantially closed at a specific position in the direction of the pipe axis X, smoke is generated between the inner peripheral surface 3a of the sleeve 3 and the fire when a fire occurs. It is possible to suppress entry into other places through the gap S formed between the pipe P and the outer peripheral surface.
[0040]
When the floor of the concrete structure 1 is constructed, a sleeve 3 made of a heat-expandable heat-resistant resin having a length larger than the axial length of the pipe through hole 2 is used.
[0041]
[Second embodiment]
FIG. 6 shows another embodiment of the through hole forming tool for a refractory structure, in which the other end of the inner peripheral surface 3a of the sleeve 3 made of a heat-expandable heat-resistant resin in the direction of the pipe axis X and the pipe P inserted therein. A cylindrical portion 8A for closing the gap S while holding the pipe P at a predetermined position, and a flange portion 8B for contacting the open end face of the sleeve 3 from the pipe axis X direction are formed integrally with the outer peripheral surface of the sleeve 3. A cylindrical cap 8 is detachably provided.
[0042]
The cylindrical cap 8 is composed of a divided cap body that is divided into two in the circumferential direction so that it can be easily packaged around the pipe P inserted into the through hole 2.
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0043]
[Third embodiment]
In the first embodiment described above, the metal or refractory cap 6 that closes the opening when not in use and does not allow the pipe P to be inserted into the other end of the sleeve 3 made of the heat-expandable heat-resistant resin in the pipe axis X direction. 7, the female screw 3e is formed at the other end of the inner peripheral surface 3a of the sleeve 3 in the pipe axis X direction, as shown in FIG. A male screw 6a screwed into the female screw 3e of the sleeve 3 and a rotation operation concave portion 6b for rotating the cap 6 with a manual operation tool such as an Allen wrench are formed. It may be carried out by detachably attaching a screw.
[0044]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0045]
[Fourth embodiment]
FIG. 8 shows another embodiment of a through-hole forming tool for a refractory structure, in which a pipe inserted into the through-hole 2 at the center of the inner peripheral surface 3a of a sleeve 3 made of a heat-expandable heat-resistant resin in the pipe axis X direction. The annular closed portion 3D that elastically contacts the outer peripheral surface of the pipe P and closes a gap formed between the outer peripheral surface of the pipe P at a specific position in the pipe axis X direction is directed radially inward. It is integrally molded in a solid shape.
[0046]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0047]
[Fifth Embodiment]
In the above-described fourth embodiment, the closing portion 3D protrudingly formed on the inner peripheral surface 3a of the sleeve 3 is formed in a solid shape. However, as shown in FIG. 9, the closing portion 3D has substantially the same thickness as other portions. It may be formed to bulge inward in the radial direction.
[0048]
In this case, since a part of the concrete cast into the annular concave portion 3 f that appears on the outer peripheral surface side of the closed portion 3 of the sleeve 3 enters, the anchor portion for fixing the sleeve 3 to the concrete structure 1. Function as
[0049]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0050]
[Sixth embodiment]
In the above-described first embodiment, one end of the inner peripheral surface 3a of the sleeve 3 made of a heat-expandable heat-resistant resin in the direction of the pipe axis X elastically contacts the outer peripheral surface of the pipe P inserted into the through hole 2. The annular closing portion 3A for closing the gap formed between the outer peripheral surface of the pipe P and the pipe P at a specific position in the direction of the pipe axis X was integrally formed. As shown in FIG. The inner peripheral surface 3a of the sleeve 3 may be integrally molded at both ends in the pipe axis X direction.
[0051]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0052]
[Seventh embodiment]
In the above-described first to sixth embodiments, the axial length of the sleeve 3 made of a heat-expandable heat-resistant resin is configured to be constant or substantially constant. However, as shown in FIGS. You may provide and implement the length change means 9 which changes the direction length L.
[0053]
The length changing means 9 is configured by fitting a pair of split sleeve bodies 3E and 3F constituting the sleeve 3 so as to be able to expand and contract in the direction of the pipe axis X.
[0054]
At the outer ends of the split sleeve bodies 3E and 3F, there are provided projection holes 3d for fixing to the concrete form 4 for constructing the concrete structure 1 with appropriate fixing means such as nails 5. A one-sided or annular mounting portion 3B is integrally formed, and one end of the inner peripheral surface of the inner sleeve-side divided sleeve body 3E in the pipe axis X direction has an outer periphery of the pipe P inserted into the through hole 2. An annular blocking portion 3A that elastically contacts or approaches the surface and that closes or substantially closes a gap S formed between the outer peripheral surface of the pipe P and a specific position in the pipe axis X direction is integrally formed. I have.
[0055]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0056]
Further, one end of the inner peripheral surface of the split sleeve body 3F on the outer fitting side in the direction of the pipe axis X is elastically in contact with or close to the outer peripheral surface of the pipe P inserted into the through hole 2, and the outer peripheral surface of the pipe P The gap S formed between the annular closing portion 3A and the annular closing portion 3A that closes or substantially closes at a specific position in the direction of the pipe axis X may be integrally formed.
[0057]
[Eighth Embodiment]
In the above-described first to sixth embodiments, the axial length of the sleeve 3 made of a heat-expandable heat-resistant resin is configured to be constant or substantially constant. However, as shown in FIGS. You may provide and implement the length change means 9 which changes the direction length L.
[0058]
The length changing means 9 is constituted by an annular projection 3G which is bent and formed in the middle part of the sleeve 3 in the pipe axis X direction in the radial direction so as to bulge outward in the axial direction and is elastically elastically deformable in the axial direction. I have.
[0059]
At both ends of the sleeve 3 in the X-axis of the pipe axis, a protruding piece having a mounting hole 3d for fixing to a concrete form 4 for constructing the concrete structure 1 with an appropriate fixing means such as a nail 5 is provided. Alternatively, an annular mounting portion 3B is integrally formed, and one end of the inner peripheral surface of the sleeve 3 in the direction of the pipe axis X elastically contacts or approaches the outer peripheral surface of the pipe P inserted into the through hole 2. An annular closing portion 3A for closing or substantially closing a gap S formed between the outer peripheral surface of the pipe P and a specific position in the direction of the pipe axis X is integrally formed.
[0060]
Since the other configuration is the same as the configuration described in the first embodiment, the same components are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.
[0061]
Further, the other end of the inner peripheral surface of the sleeve 3 in the direction of the pipe axis X is elastically in contact with or close to the outer peripheral surface of the pipe P inserted into the through hole 2 and is formed between the outer peripheral surface of the pipe P and the outer peripheral surface of the pipe P. The closed space 3A for closing or substantially closing the gap S to be closed at a specific position in the direction of the pipe axis X may be integrally formed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view in a disassembled state of a through hole forming tool for a fire-resistant structure according to a first embodiment of the present invention; FIG. 2 is a view taken along the line II-II in FIG. 1; FIG. 4 is a cross-sectional side view showing a state in which a formwork is mounted before FIG. 4 is a cross-sectional side view after constructing a concrete structure FIG. 5 is a cross-sectional side view when piping is inserted into a sleeve of the concrete structure FIG. FIG. 7 is a cross-sectional side view showing a second embodiment of a through-hole forming tool for a fire-resistant structure of the present invention. FIG. 7 is a cross-sectional side view showing a third embodiment of a through-hole forming tool for a fire-resistant structure of the present invention. FIG. 9 is a cross-sectional side view showing a fourth embodiment of a through-hole forming tool for a fire-resistant structure of the present invention. FIG. 9 is a cross-sectional side view showing a fifth embodiment of a through-hole forming tool for a fire-resistant structure of the present invention. FIG. 1 is a sectional side view showing a sixth embodiment of a through-hole forming tool for a refractory structure according to the present invention. FIG. 12 is a cross-sectional side view showing a seventh embodiment of a through-hole forming tool for a fire-resistant structure according to the present invention; FIG. 12 is a cross-sectional side view showing a state in which a formwork is mounted before concrete is cast; Sectional view showing an eighth embodiment of a through-hole forming tool for use in an eighth embodiment. FIG. 14 is a sectional side view showing a state in which a formwork is attached before concrete casting. FIG. 15 is a sectional side view showing a conventional fire-resistant structure of a through-hole. Explanation of code]
P Piping X Piping axis 1 Concrete structure 2 Through hole 3 Sleeve 3A Closed part 3B Mounting part 3C Retaining projection 3D Closed part 3E Split sleeve body 3F Split sleeve body 3G Annular protrusion 3a Inner peripheral surface 3b Outer peripheral surface 4 Concrete form 9 Length changing means

Claims (9)

A sleeve to be buried to form a through hole for piping at a planned piping location of a concrete structure, made from a heat-expandable heat-resistant resin capable of substantially closing the through-hole after pipe insertion by thermal expansion, A blocking portion is formed on the sleeve so as to close or substantially close the gap formed between the sleeve and the outer peripheral surface of the pipe in contact with or near the outer peripheral surface of the piping at a specific position in the axial direction of the piping. Through-hole forming tool for refractory structures. The through-hole forming tool for a fire-resistant structure according to claim 1, wherein a mounting portion for a concrete formwork for constructing a concrete structure is formed at at least one end of the sleeve in the axial direction of the pipe. The through-hole forming tool for a fireproof structure according to claim 1 or 2, wherein a retaining projection embedded in a concrete structure is formed on an outer peripheral surface of the sleeve. The through-hole forming device for a fire-resistant structure according to any one of claims 1 to 3, wherein the sleeve is configured to be equal to or longer than the axial length of the piping through-hole. The through hole forming tool for a fireproof structure according to any one of claims 1 to 4, wherein the closing portion is configured to be elastically deformable radially outward of the sleeve. The through-hole forming tool for a refractory structure according to any one of claims 1 to 5, wherein the closing portion is formed at a plurality of locations in a tube axis direction of the sleeve. The through-hole forming tool for a fire-resistant structure according to any one of claims 1 to 6, further comprising a length changing means for changing a length of the sleeve in the axial direction. 8. The through-hole forming tool for a fire-resistant structure according to claim 7, wherein said length changing means is constituted by fitting a pair of split sleeves constituting a sleeve so as to be able to expand and contract in the axial direction. 8. The through hole forming tool for a fire-resistant structure according to claim 7, wherein said length changing means comprises an annular projection which is formed at an intermediate portion of the sleeve in the axial direction and which can be extended and contracted in the axial direction.

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