JP2000073376A - Sheath pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheath pipe which is recyclable and capable of eliminating wasteful use of expensive parts for foundation. SOLUTION: In forming in a foundation an anchor fitting hole to fix an anchor member projecting downwardly from a lower surface of a building unit, a sheath pipe to be installed inside a concrete is provided with a cylindrical body 2 in which a hard elastic body is rounded in an expandable manner, a bearing core member 5 which is stored inside the body 2 and maintains the body 2 in a cylindrical shape of a specified dimension against the external force to be applied from the outside of the body 2, and a lid member 3 to cover an end opening of the body 2. The cylindrical body 2 in which the elastic body is rounded in an expandable manner is contracted and automatically peeled from the concrete, and easily removed to enable the recycling by drawing the bearing core member 5 after the foundation is cured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the formation of a sheath tube and an anchor implantation hole used for fixing a box-shaped building unit to a foundation.

[0002]

2. Description of the Related Art Conventionally, unit-type buildings constructed by combining a plurality of box-shaped building units manufactured in a factory at a building site have been used. As a building unit forming a unit building, a building unit having a rectangular parallelepiped frame in which upper and lower ends of four pillars are connected by a ceiling beam and a floor beam is generally used. In the factory, the frame of the building unit includes, in a factory, ceiling surface materials supported by ceiling beams, flooring materials supported by floor beams, and interior materials such as partition walls for partitioning a roof, and lightweight foam concrete plates (hereinafter, referred to as “walls”). An outer wall material or the like made of "ALC plate" is attached. According to such a unit-type building, the work of assembling the interior material and the outer wall material to the building unit is performed in the factory, and thereafter, only the fixing work between the building units and between the building unit on the first floor and the foundation is performed. Thus, since the building is completed, the work at the construction site is greatly reduced, and there is an advantage that the construction work can be completed in a short time.

Here, the fixing between the building unit and the foundation is as follows.
This is performed by providing an anchor planting hole in the upper surface of the foundation, filling grout inside the anchor planting hole, and inserting an anchor projecting from the lower surface of the pillar into the anchor planting hole. The anchor implantation hole is formed by embedding the sheath tube at the time of placing the foundation. 9 to 11 show an example of a sheath tube embedded in a foundation. That is, in FIGS. 9 and 10, the anchor 101 protrudes downward from the lower surface of the building unit 100. On the other hand, the base 102 is provided with a sheath tube 103 embedded when concrete is poured.
The fixing of the building unit 100 to the foundation 102
After curing the concrete of No. 2, the anchor bolt 101 protruding from under the building unit 100 is inserted into the inside of the sheath tube 103 into which the mortar 104 has been injected. As shown in FIG. 11, the sheath tube 103 includes an iron cylindrical main body 103A formed in a cylindrical shape,
And a bottom cover 103B.

[0004]

SUMMARY OF THE INVENTION Such a sheath tube 1 is described.
03 has the same role as the formwork for placing the foundation 102, and after the anchor planting hole is completed, its role is completed. Regardless, it remains embedded in the concrete. For this reason, there is a problem that the expensive iron sheath tube 103 is wasted as a part for the foundation.
Further, since the sheath tube 103 embedded in the base 102 is made of iron, if it is exposed from the base 102 by rainwater or the like, rust is generated on the exposed portion, and a problem occurs that the appearance of the base 102 is spoiled. To eliminate the need for such a problematic sheath tube, the present applicant has disclosed in Japanese Patent Application Laid-Open No. Hei 5-7904.
No. 2 is proposed, but the method for forming the hole for planting the anchor member and the hole forming die disclosed in this publication have a large number of parts, and the cost and labor of the work are not sufficiently reduced.
There is a need for more effective ones.

[0005] It is an object of the present invention to provide a sheath tube which is reusable and eliminates the waste of expensive foundation parts.

[0006]

According to a first aspect of the present invention, referring to the drawings, when a box-shaped building unit is fixed to a foundation, it projects downward from a lower surface of the building unit. A sheath tube 1 installed in a foundation molding frame into which concrete is cast in order to form an anchor planting hole through which an anchor member to be inserted is inserted in the foundation, wherein the hard elastic body is expanded in diameter. A cylindrical main body 2 which is rounded as possible, and is housed inside the main body 2;
It is characterized by comprising a support core member 5 for maintaining the main body in a cylindrical shape having a predetermined size against external force applied from the outside of the main body 2, and a lid member 3 for closing an end opening of the main body. . According to the present invention, the cylindrical body 2 in which the elastic body is rolled up so that the diameter can be expanded can be easily removed and reused after the foundation is cured, as compared with the case where the metal pipe is left embedded. Then, the cost for fixing the building unit to the foundation is reduced, and the strength of the foundation is not reduced. In addition, since it is not necessary to leave metal parts at the construction site, problems such as rust do not occur, and the appearance of the foundation is improved.

In the above, the main body 2 expands in diameter when the support core 5 is inserted therein, and reduces its diameter to almost the original diameter by its elastic force when the support core 5 is removed. Preferably, there is. According to this configuration, when the support core material 5 is pulled out after the concrete is cast, the diameter of the support core material 5 is reduced to almost the original diameter by the elastic force.
The main body 2 is automatically peeled off from the concrete, and is easily removed, so that the efficiency of the foundation setting work at the construction site is improved. Further, it is preferable that the supporting core 5 has a cross-sectional shape in a cross shape. In this way, by inserting the support core member 5 into the main body 2, the cross-shaped tip uniformly pushes the main body 2 from the inside to the outside, and the main body 2 has a circular cross section having a desired inner diameter. In addition to the formation of the anchor implant hole, the cross-shaped tip portion of the support core 5 is deformed in the circumferential direction by rotating the support core member 5 left and right inside the main body 2 so that the insertion and removal of the main body 2 can be easily performed. Can do it.

According to a second aspect of the present invention, in fixing a building unit formed in a box shape to a foundation, an anchor planting hole through which an anchor member projecting downward from a lower surface of the building unit is inserted is used as the base. A sheath tube 1A installed in a frame for foundation molding into which concrete is cast to form a body 2A in which a soft face material is rolled into a cylindrical shape, and a sheath 2A housed inside the body 2A. Along with
A cylindrical support core member 5 for maintaining the main body in a cylindrical shape having a predetermined size against external force applied from the outside of the main body 2A.
A, and an interposition member 25 made of a soft elastic body interposed between the main body 2A and the support core 5A. In such a second invention, as in the first invention, the main body 2A can be removed after the foundation has been cured, can be reused, and the cost required for fixing the building unit to the foundation is reduced. There is no problem such as rust, and the appearance of the foundation is improved. In addition, the main body 2A and the interposition member 25 can be made of a synthetic resin, thereby reducing the number of metal parts and reducing the weight as a whole. Installation efficiency is improved. Furthermore, inside the sheath tube 1A,
Since the support core member 5A and the interposition member 25 are inserted and the bottom is in a closed state, concrete does not enter the inside, the lid at the bottom is not required, and the number of parts is reduced.

In the above, it is preferable that the interposition member 25 is integrated with the back surface of the main body 2A. This makes it possible to integrally mold the interposition member 25 together with the main body 2A, thereby facilitating the manufacture and freely compressing and deforming the interposition member 25 at the time of removing the sheath tube 1A. Therefore, the main body 2A can be easily peeled off from the concrete, and the removing operation can be easily performed.

The interposition member 25 has a C-shaped cross section in which the soft elastic body is rounded into a cylindrical shape and a gap P is formed on a side surface thereof.
A convex portion 26 protruding from the side surface is provided.
6 is preferably arranged to fill the gap P of the interposition member 25 interposed between the support core member 5 and the main body 2. With this configuration, when the support core material 5A is pulled out from the inside of the main body 2A, a gap P is formed between the C-shaped ends of the interposition member 25. When the support core member 5A is removed from the inside of the main body 2A and the ends of the interposition member 25 are aligned so that the above-mentioned gap P is eliminated, the main body 2A is reduced in diameter,
The sheath tube 1A can be easily removed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a sheath tube 1 according to a first embodiment of the present invention. The sheath tube 1 includes a cylindrical body 2 in which a steel plate, which is a hard elastic body, is rolled so as to be able to expand in diameter, and a lid member 3 provided at a lower bottom portion of the sheath tube 1. The outer peripheral surface of the main body 2 is provided with a protruding portion 4 protruding in the radial direction. The projecting portion 4 forms a concave portion corresponding to the projecting portion on the concrete side when the concrete is solidified. A part of the mortar injected into the anchor implant hole also enters the above-mentioned concave portion and forms a locking portion for preventing the mortar from coming out of the anchor implant hole. The cover member 3 is for preventing the concrete from entering the inside of the sheath tube when the concrete is poured after the sheath tube 1 is installed. Further, inside the sheath tube 1, a support core member 5 that is housed inside the main body 2 and maintains the main body 2 in a cylindrical shape having a predetermined dimension against external force applied from the outside of the main body 2. Provided. The support core member 5 has a cross-sectional shape of a cross, and
The diameter of the support core member 5 is increased by inserting the support core member 5 therein, and when the support core member 5 is removed, the diameter is reduced by the elastic force of the support core member 5 to return to substantially the original diameter. The support core member 5 is protruded from a fixing portion 6 that is fixed to a formwork during concrete casting. Note that the fixing portion 6 includes a mounting plate 6A portion and a base portion 6B.

FIG. 3 shows a steel plate 7 which is a raw material of the sheath tube 1. The steel plate 7 has a substantially rectangular shape, and its long side 7A and short side 7B are selectively determined according to dimensions required when the steel plate 7 is rolled into a cylindrical shape.
The steel plate 7 has a corrugated portion that forms the protruding portion 4 when the steel plate 7 is rolled into a cylindrical shape.

Next, the operation of the main body 2 will be described. When the supporting core 5 is inserted into the main body 2, the main body 2 is in a state where the diameter is expanded. In this state, the lid member 3 is attached to the bottom of the main body 2, and the bottom surface of the main body 2 is sealed. The sheath tube 1 in such a state is
As shown in FIG. 4, it is installed on the formwork 20 via the support core material 21 bridged over the foundation forming formwork 20 and the fixing portion 6 attached to the support core material 21 by the nut 23. . Here, concrete is poured into the inside of the foundation forming formwork 20, and after the concrete is cured, the sheath tube 1 is removed.
Remove from solidified concrete. At this time, the main body 2 of the sheath tube 1 is reduced in diameter by its own elastic force by pulling out the support core material 5, and as shown in FIG. It comes off the concrete automatically and can be easily pulled out of the foundation. The cover member 3 is left on the foundation in an embedded state, and is so-called discarded.

According to the above-described embodiment, the following effects can be obtained. That is, since the elastic body is rolled to form the main body 2 and can be easily removed from the foundation after the foundation is cured, the main body 2 can be reused repeatedly.
Compared with the case where the metal tube is left embedded, the cost for fixing the building unit to the foundation can be reduced, and the strength of the foundation does not decrease at all. In addition, since it is not necessary to leave metal parts in the construction site, problems such as rust do not occur, and the appearance of the foundation can be improved.

Further, the diameter is increased by inserting the support core material 5,
When the support core 5 is pulled out, the main body 2 is reduced in diameter to almost the original diameter by its elastic force. Therefore, when the support core 5 is pulled out after curing of the foundation, the main body 2 is pulled by the elastic force. Since the diameter is reduced to almost the original diameter, the main body 2 automatically peels off from the concrete, the work of removing the main body 2 can be easily performed, and the efficiency of the foundation setting work at the construction site can be improved.

Further, since the support core 5 having a cross-shaped cross section is employed, the cross-shaped tip of the support core 5 inserted into the main body 2 uniformly presses the main body 2 from the inside to the outside. Then, the main body 2 has a circular cross section having a desired inner diameter, and a necessary anchor implantation hole can be reliably formed. In addition, by rotating the support core 5 right and left inside the main body 2,
The cross-shaped tip portion of the support core member 5 is deformed in the circumferential direction, so that the support core member 5 can be easily inserted into and removed from the main body 2, and from this point also, the efficiency of the foundation setting work at the construction site can be improved.

FIGS. 6 to 8 show a second embodiment of the present invention. In the second embodiment, the sheath tube 1 provided with the lid member 3 in the first embodiment is a sheath tube 1A that does not require a lid member. 6 and 7, a sheath tube 1A includes a main body 2A obtained by rolling a vinyl chloride sheet as a soft face material into a cylindrical shape, and a main body 2A.
And a cylindrical support core 5 for maintaining the main body 2A in a cylindrical shape having a predetermined dimension against external force applied from the outside of the main body 2 and a main support 2A and a support core 5A. Interposed member 25 made of a soft elastic body interposed between
And

The interposition member 25 has a C-shaped cross section obtained by rolling a polyurethane foam, which is a soft elastic body, into a substantially cylindrical shape, and is integrated with the back surface of the main body 2. A gap P is formed on the side surface of the interposition member 25.
As shown in FIG.
5B are formed. Here, the supporting core member 5A is provided with a convex portion 26 protruding from the side surface thereof so as to correspond to the gap P of the interposition member 25. The projection 26 fills the gap P between the interposition members 25. The support core member 5A is, like the support core member 5 of the first embodiment, protruded from a fixing portion 6 used for fixing to a foundation casting formwork. A spiral projecting portion 4 is formed on the outer peripheral surface of the main body 2A, similarly to the main body 2 of the first embodiment.

Next, the operation of the sheath tube 1A will be described. When the support core 5A is inserted into the inside of the main body 2A, or when the main body 2A is wound around the support core 5A, the interposition member 25 is provided between the main body 2 and the support core 5A. The bottom of 2A is closed,
The lid member in the first embodiment becomes unnecessary. The sheath tube 1A in such a state is the same as the sheath tube 1 of the first embodiment.
Similarly to the above, it is installed on the formwork 20 via the support core 21 bridged over the base formwork 20 and the fixing portion 6 attached to the support core 21 by the nut 23. Here, concrete is poured into the inside of the foundation forming frame 20, and after the concrete is cured, the sheath tube 1A is removed from the solidified concrete. At this time, after the support core material 5A is pulled out from the inside of the main body 2A to form a gap P, the opposing surface 25 of the interposition member 25 is manually removed so as to eliminate the gap P.
When A and 25B are brought together, the diameter of the main body 2A is reduced, and the main body 2A can be easily pulled out of the solidified concrete.

As described above, also in the present embodiment, the same operation and effect as those of the first embodiment can be obtained. In addition, the number of metal parts is reduced, the overall weight is reduced, and the handling and transportation thereof are performed. In addition, since a cover member is not required, the effect that the construction cost can be further reduced can be added.

Although the present invention has been described with reference to the preferred embodiment, the present invention is not limited to this embodiment, and various improvements and design changes may be made without departing from the gist of the present invention. It is possible. For example, although the protruding portion 4 is provided integrally with the main body 2, a rope-shaped member such as a string may be separately wound around the main body 2. In addition, the support core material is not limited to the cross-shaped cross-section, and other cross-sectional shapes such as a star projecting radially from the center in three directions may be employed. It can be set as appropriate according to the shape of the anchor implantation hole to be formed and the material of the steel plate 7 to be used. Further, the material of the sheath tube main body, the support core material and the interposed member is not limited to those described in the above embodiment, and other metals, synthetic resins, and synthetic resin elastomers can be adopted. , May be appropriately selected for implementation.

[0022]

As described above, according to the present invention, expensive foundation parts can be reused, and waste of parts can be eliminated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the embodiment.

FIG. 3 is a perspective view showing a raw material of a main body of the embodiment.

FIG. 4 is a perspective view showing an installed state of the embodiment on a mold.

FIG. 5 is a view for explaining the operation of the main body of the embodiment.

FIG. 6 is a perspective view showing a second embodiment of the present invention.

FIG. 7 is an exploded perspective view showing the embodiment.

FIG. 8 is an enlarged bottom view of the embodiment.

FIG. 9 is an exploded perspective view showing a conventional example.

FIG. 10 is a sectional view of the conventional example.

FIG. 11 is a front view showing a sheath tube according to the conventional example.

[Explanation of symbols]

 1, 1A sheath tube 2, 2A main body 3 lid member 5, 5A support core material 25 interposition member 26 convex portion P gap

Claims (6)

[Claims] When fixing a box-shaped building unit to a foundation, concrete is formed on the foundation by forming an anchor planting hole through which an anchor member projecting downward from a lower surface of the building unit is inserted. Is a sheath tube installed in a frame for foundation molding to be cast therein, wherein a hard elastic body is rolled up so as to be able to expand in diameter and a cylindrical main body is accommodated inside the main body, and A sheath tube comprising: a support core for maintaining the main body in a cylindrical shape having a predetermined size against external force applied from the outside of the main body; and a lid member for closing an end opening of the main body. 2. The sheath tube according to claim 1, wherein said main body expands in diameter when said support core is inserted therein, and when said support core is pulled out, said main body is substantially restored to its original state by its elastic force. A sheath tube having a diameter reduced to a diameter. 3. The sheath tube according to claim 1, wherein the support core has a cross-sectional shape. 4. When fixing a box-shaped building unit to a foundation, concrete is formed on the foundation by forming an anchor planting hole through which an anchor member projecting downward from a lower surface of the building unit is inserted. Is a sheath tube installed in a foundation molding frame that is cast therein, and a soft surface material is rolled into a cylindrical shape, and is accommodated inside the main body, and from the outside of the main body. A cylindrical support core material for maintaining the main body in a cylindrical shape having a predetermined size against an applied external force, and an interposition member formed of a soft elastic body interposed between the main body and the support core material. A sheath tube comprising: 5. The sheath tube according to claim 4, wherein the interposition member is integrated with a back surface of the main body. 6. The sheath tube according to claim 4, wherein the interposition member has a cross section C in which the soft elastic body is rounded into a cylindrical shape and a gap is formed on a side surface thereof.
The support core member is provided with a convex portion protruding from a side surface thereof, and the convex portion is provided between the support core member and the main body. A sheath tube arranged so as to fill the gap.