JP2023144479A - Spacer for temporary support - Google Patents

Abstract

To provide a spacer for a temporary support allowing durability of a structure to be kept as sufficiently securing covering dimensions and allowed to be easily removed.SOLUTION: A spacer 1 for a temporary support to cure a temporal support column attached between a sheath pipe 4 and the temporal support column when inserting the temporary support column 2 into the sheath pipe and placing concrete 5 is provided with: a base part 20 inserted in the sheath pipe 4; and an exposed part 50 formed above the base part 20 and exposed from a surface of the placed concrete. The spacer 1 for a temporary support is a cylindrical body having a through hole 10 passing from the base part to the exposed part in a vertical direction, wherein the exposed part 50 has an engagement part 51 formed to allow engagement of a tool.SELECTED DRAWING: Figure 1

Description

The present invention relates to a spacer for temporary support columns.

Conventionally, when installing a temporary structure such as a handrail, a temporary support spacer is used between a cylindrical sheath fixed to a beam or the like and a support that is inserted into the sheath. When the concrete is poured and the support columns are fixed, the lower part of the temporary support spacer is buried together with the sheath pipe, and the upper part is exposed from the concrete. When the work is completed and the temporary structure is no longer needed, the support can be easily removed by removing the spacer for the temporary support from the sheath tube.

As such a spacer for a temporary support column, Patent Document 1 discloses a joint that prevents the handrail from shaking and reduces the effort required to remove the handrail.

Japanese Patent Application Publication No. 11-270143

By the way, carbon dioxide and sulfur dioxide gas in exhaust gas enter concrete through exposed surfaces and cause a carbonation reaction, causing a deterioration phenomenon called carbonation. There are concerns that carbonation may also affect the durability of structures. In the civil engineering and construction industries, in order to prevent the carbonation of concrete from reaching the reinforcing bars of buildings from the concrete surface, a cover dimension from the concrete surface to the reinforcing bars is ensured.

Even in temporary structures such as handrails, it is preferable to ensure a sufficient cover dimension from the concrete surface to the upper end of the sheath pipe. However, if a large cover size is ensured for a temporary structure, a problem arises in that the area where the temporary support spacer is buried in concrete increases, making it difficult to remove it. Patent Document 1 does not consider the issue of how to make it easier to remove the temporary support spacer when a sufficient cover size is ensured in the temporary structure.

The present invention has been made in view of these points, and provides a spacer for a temporary support column that can secure a sufficient covering dimension to maintain the durability of a structure and is also easily removable.

In order to achieve the above object, in the first invention,
A temporary support spacer for curing the temporary support by being attached between the sheath pipe and the temporary support when installing the temporary support by inserting the temporary support into the sheath pipe and pouring concrete,
a base inserted into the sheath;
an exposed portion formed above the base and exposed from the surface of the poured concrete;
a cylindrical body having an insertion hole extending vertically from the base to the exposed part;
The exposed portion is characterized in that it has an engaging portion that is formed to be able to engage a tool.

According to the above configuration, when removing the temporary support that has been inserted into the insertion hole, the temporary support spacer can be easily pulled out from the concrete by engaging the tool with the engaging portion provided in the exposed portion. This makes it possible to ensure a larger cover dimension from the concrete surface to the upper end of the sheath tube than with a spacer that does not have an engaging portion.

In the second invention, in the first invention,
a seal portion between the base portion and the exposed portion, the outer circumferential surface of which slopes upwardly away from the insertion hole; A tapered part that slopes away,
The angle of inclination of the outer peripheral surface of the tapered portion with respect to the axis of the insertion hole is larger than the angle of inclination of the outer peripheral surface of the seal portion with respect to the axis of the insertion hole.

According to the above configuration, by making the seal part and the taper part different inclination angles and expanding the diameter in two stages, the seal part can reliably prevent concrete from entering the inside of the sheath pipe, and the taper part Since the effect of making it easier to remove the temporary support spacer when removing the temporary support can be fully exhibited in the section, it becomes possible to secure a sufficient cover dimension X from the upper end of the sheath pipe to the concrete surface.

In the third invention, in the first invention,
The engagement portion is an engagement hole that is provided on the outer periphery of the insertion hole and has an opening in a direction in which the insertion hole extends or in a direction that intersects with the direction in which the insertion hole extends.

According to the above configuration, the tip of a tool such as a ratchet is inserted into the opening of the engagement hole and engaged, making it easier to pull out the temporary support spacer, thereby making it possible to secure a large cover size.

As explained above, according to the present invention, it is possible to provide a spacer for a temporary support column that can secure a sufficient covering dimension to maintain the durability of the structure and can be easily removed.

FIG. 2 is a cross-sectional view of a main part of a temporary support using the temporary support spacer according to the first embodiment. 1 is a perspective view of a temporary support spacer according to Embodiment 1. FIG. FIG. 2 is a side view of the temporary support spacer according to the first embodiment. FIG. 2 is a plan view of a temporary support spacer according to Embodiment 1. FIG. 4 is a sectional view taken along the line V-V in FIG. 3. FIG. 4 is a sectional view taken along the line VI-VI in FIG. 3. FIG. It is a figure which shows the installation procedure of the temporary support column using the spacer for temporary support columns. It is a figure which shows the installation procedure of the temporary support column using the spacer for temporary support columns. It is a figure which shows the installation procedure of the temporary support column using the spacer for temporary support columns. It is a figure which shows the installation procedure of the temporary support column using the spacer for temporary support columns. FIG. 7 is a perspective view of a temporary support spacer according to a second embodiment. FIG. 7 is a perspective view of a temporary support spacer according to Embodiment 3. FIG. 7 is a perspective view of a temporary support spacer according to Embodiment 4. FIG. 7 is a perspective view of a temporary support spacer according to Embodiment 5. FIG. 7 is a longitudinal cross-sectional view of a temporary support spacer according to Embodiment 5.

(Embodiment 1)
Hereinafter, a temporary support spacer according to an embodiment will be described with reference to the drawings.

FIG. 1 is a sectional view of a main part of a temporary support using a temporary support spacer according to a first embodiment. As shown in FIG. 1, a temporary support spacer 1 according to an embodiment of the present invention inserts a temporary support 2, which is used for a structure such as a temporary handrail, into a sheath pipe 4 fixed to the upper surface of a reinforcing beam 3. However, when concrete 5 is cast and installed, it is attached between the sheath pipe 4 and the temporary support 2 to protect the temporary support 2.

2 is a perspective view of the spacer for temporary support, FIG. 3 is a side view, FIG. 4 is a plan view, FIG. 5 is a sectional view taken along the line V-V in FIG. 3, and FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3. . Specifically, the temporary support spacer 1 is a cylindrical body having an insertion hole 10 penetrating in the vertical direction as shown in FIGS. 2 to 6, and is molded from synthetic resin.

The temporary support spacer 1 has a base 20 inserted into the sheath tube 4 at its lower end. The cylindrical peripheral wall 11 forming the base 20 has an outer diameter smaller than the inner diameter of the sheath tube 4, an inner diameter larger than the outer diameter of the temporary support 2, a uniform wall thickness, and extends substantially vertically. . Furthermore, a plurality of slits 21 are formed in the base 20, and the slits 21 become narrower upward from the lower end. Although there is no limit to the number of slits 21, in this embodiment, as shown in FIG. 5, six slits 21 are formed at equal intervals in the circumferential direction.

A seal portion 30 is formed continuously from the base 20 at the upper portion of the base 20 , in which the outer circumferential surface of the peripheral wall 11 abuts against the inner circumferential surface of the sheath tube 4 . In the seal portion 30, the circumferential wall 11 increases in diameter upward, and the outer circumferential surface is inclined upward away from the insertion hole 10. In the seal portion 30, the peripheral wall 11 is preferably sloped at a gentle angle, and in the embodiment, the peripheral wall 11 is sloped at an angle of 2.5° with respect to the axis O of the insertion hole 10. The seal portion 30 prevents the concrete 5 from entering the inside of the sheath pipe 4.

A tapered portion 40 is formed at the upper portion of the seal portion 30 and continues from the seal portion 30 . The tapered portion 40 is formed such that an outer circumferential surface 12b is inclined upwardly and further away from the insertion hole 10, and an inner circumferential surface 13a forming the insertion hole 10 extends substantially vertically inside the outer circumferential surface 12b.

Specifically, as shown in FIGS. 1 and 6, the tapered portion 40 has a circumferential wall 11 forming the base portion 20 and the seal portion 30, which is divided into an outer circumferential wall 12 and an inner circumferential wall 13 from above the seal portion 30. The tapered part 40 has a heavy wall structure, and the tapered part 40 has an inner circumferential wall 13 that extends in a substantially vertical direction on the inside in the radial direction centering on the axis O of the insertion hole 10, and an upper part on the outside in the radial direction of the inner circumferential wall 13. It has an outer circumferential wall 12 that expands in diameter away from an inner circumferential wall 13. The inner circumferential wall 13 forms an insertion hole 10 . The insertion hole 10 in the tapered portion 40 has a larger diameter than the base portion 20 and the seal portion 30.

The length dimension of the temporary support spacer 1 is designed such that the surface of the concrete 5 placed is located at the tapered portion 40. Therefore, the outer circumferential surface 12b of the outer circumferential wall 12 contacts the concrete 5. The outer circumferential surface 12b of the tapered portion 40 has an inclination angle of about 15° with respect to the axis O of the insertion hole 10. That is, the angle of inclination of the outer circumferential surface 12b of the outer circumferential wall 12 in the tapered portion 40 with respect to the axis O of the insertion hole 10 is larger than the inclination angle of the outer circumferential surface of the circumferential wall 11 in the seal portion 30 with respect to the axis O of the insertion hole 10.

In this way, by making the seal portion 30 and the tapered portion 40 at different angles of inclination and expanding the diameter in two stages, it is possible to reliably prevent the concrete 5 from entering the inside of the sheath tube 4 in the seal portion 30. At the same time, in order to fully exhibit the effect of making it easier to remove the temporary support spacer 1 when removing the temporary support 2 at the tapered part 40, the cover dimension X from the upper end of the sheath pipe 4 to the surface of the concrete 5 can be sufficiently It becomes possible to secure it.

An exposed portion 50 is formed at the upper part of the tapered portion 40 . The exposed portion 50 is a portion exposed upward from the surface of the poured concrete 5, and is formed by the outer circumferential wall 12 and the inner circumferential wall 13 extending in the vertical direction. A flange portion 52 in which the outer peripheral wall 12 extends radially outward is formed at the upper end of the exposed portion 50 .

Moreover, the exposed part 50 has an engaging part 51 formed to be able to engage the tip of a tool such as a ratchet. Specifically, the engaging portion 51 is an engaging hole formed between the outer circumferential wall 12 and the inner circumferential wall 13 so as to have an opening in the direction in which the insertion hole 10 extends. In this embodiment, the engagement portion 51 is an engagement hole having an opening that opens upward between the outer circumferential wall 12 and the inner circumferential wall 13. A pair of partition walls 14 are provided in a hollowed out portion between the outer circumferential wall 12 and the inner circumferential wall 13 so as to connect the outer circumferential wall 12 and the inner circumferential wall 13. The engaging portion 51 is formed between the pair of partition walls 14 . When viewed from above as shown in FIG. 4, the engaging portions 51 have a semi-elliptical shape, have an opening at the upper end of the tapered portion 40, and are provided in four engagement portions at approximately 90° intervals in the circumferential direction.

(Installation and removal of temporary supports)
Next, the procedure for installing the temporary support column 2 using the temporary support spacer 1 will be explained based on FIGS. 7 and 8, and the procedure for removing it will be explained based on FIGS. 9 and 10.

First, as shown in FIG. 7, a sheath tube 4, which is a cylindrical member made of metal, is erected vertically on the upper surface of the reinforcing bar beam 3 and fixed by welding. The base 20 of the temporary support spacer 1 is inserted into the cylindrical interior of the sheath tube 4. The upper end of the sheath tube 4 is located at a sealing portion 30 , where the outer circumferential surface of the peripheral wall 11 comes into contact with the inner circumferential surface of the sheath tube 4 .

Next, as shown in FIG. 8, the temporary strut 2 is inserted into the insertion hole 10 of the temporary strut spacer 1, and the temporary strut 2 is attached to the sheath tube 4 via the temporary strut spacer 1. The temporary support column 2 is in a fixed state by the temporary support spacer 1. In this state, concrete 5 is placed on the reinforcing beam 3 so that a sufficient cover dimension X from the upper end of the sheath pipe 4 to the surface of the concrete 5 is ensured. The upper surface of the concrete 5 is located at the tapered portion 40. In this way, the temporary support column 2 is installed.

When removing the temporary support 2, the temporary support spacer 1 is pulled out from the concrete 5 surface, and the temporary support 2 is also pulled out. The operator can remove the temporary support spacer 1 by grasping the exposed portion 50 and rotating the temporary support spacer 1 around the temporary support support 2. The larger the cover size X is, the more difficult it becomes to remove the temporary support spacer 1, but in this embodiment, even if the cover size X is 30 mm, the temporary support spacer 1 can be easily removed.

If it is difficult to remove the temporary support spacer 1 after pulling out the temporary support 2 from the concrete surface 5, a tool such as a ratchet 7 may be used as shown in FIG. By inserting the tip of the ratchet 7 into the opening of the engaging part 51 from above and rotating the temporary support spacer 1 around the axis O, the temporary support spacer 1 can be removed more easily. Become.

After pulling out the temporary support spacer 1 from the concrete 5 surface, as shown in FIG. Removal work is completed.

According to the temporary support spacer 1 of this embodiment configured as described above, even if the temporary support spacer 1 is difficult to pull out when the cover dimension X is large, the exposed portion 50 is exposed from the concrete 5. By engaging a tool such as the ratchet 7 with the engaging portion 51 provided in the holder, the operator can easily pull out the temporary support spacer 1. Moreover, if a tapered part 40 whose diameter increases upward is formed between the base part 20 inserted into the sheath pipe 4 and the exposed part 50, and the concrete 5 is poured so that the surface is located in the tapered part 40, Even if a larger cover dimension X is ensured, the temporary support spacer 1 can be easily pulled out. Furthermore, by providing a seal portion 30 having an inclination angle smaller than the inclination angle of the taper portion 40 between the base portion 20 and the tapered portion 40 and inclining it in two stages, the concrete 5 can be removed at the seal portion 30. In addition to preventing it from entering the sheath tube 4, the tapered portion 40 can enhance the effect of making it easier to pull out.

(Embodiment 2)
Next, a temporary support spacer 1 according to a second embodiment will be explained based on FIG. 11. Note that descriptions of configurations similar to those of the above embodiment will be omitted. Components similar to those in the above embodiment will be described with the same reference numerals.

The engagement portion 51 of the temporary column spacer 1 of this embodiment is an engagement hole having an opening that opens in the extending direction of the insertion hole 10 between the outer circumferential wall 12 and the inner circumferential wall 13. In this embodiment, the engagement portions 51 are engagement holes having upward openings between the outer circumferential wall 12 and the inner circumferential wall 13, and are formed in plural in the circumferential direction.

A plurality of partition walls 14 connecting the outer circumferential wall 12 and the inner circumferential wall 13 are formed in the hollowed out portion between the outer circumferential wall 12 and the inner circumferential wall 13. The partition walls 14 are arranged radially around the axis and are provided at equal intervals. The engaging portion 51 is capable of engaging a tool from an opening defined in each partition wall 14 . Twelve engaging portions 51 are provided in the partition wall 14 at intervals of approximately 30 degrees in the circumferential direction.

When pulling out the temporary support spacer 1, it is easy to pull out the temporary support spacer 1 by inserting the tip of a tool such as a ratchet 7 into the opening of the engaging part 51 from above and rotating the temporary support spacer 1 around the axis O. The temporary support spacer 1 can then be removed.

(Embodiment 3)
Next, a temporary support spacer 1 according to Embodiment 3 will be explained based on FIG. 12. Note that descriptions of configurations similar to those of the above embodiment will be omitted. Components similar to those in the above embodiment will be described with the same reference numerals.

The temporary post spacer 1 of this embodiment has a groove-shaped engagement portion 51 in the exposed portion 50 that divides the outer peripheral wall 12 and the inner peripheral wall 13 in the circumferential direction. The engaging portion 51 is an engaging hole whose peripheral wall is U-shaped when viewed from the side and has an opening that opens in a direction (radial direction) intersecting the direction in which the insertion hole 10 extends. The engaging portion 51 communicates with the insertion hole 10 . The partition walls 14 that connect the outer circumferential wall 12 and the inner circumferential wall 13 constitute circumferential walls on both sides of the engaging portion 51 in the circumferential direction. Four engaging portions 51 are provided in the circumferential direction at approximately 90° intervals.

When pulling out the temporary support spacer 1, insert the tip of a tool such as a ratchet 7 into the engaging portion 51 from the direction of extension of the insertion hole 10 (above) or the direction intersecting the direction of extension of the insertion hole 10 (radial direction). By rotating the temporary support spacer 1 about the axis O, the temporary support spacer 1 can be easily removed.

(Embodiment 4)
Next, a temporary support spacer 1 according to a fourth embodiment will be explained based on FIG. 13. Note that descriptions of configurations similar to those of the above embodiment will be omitted. Components similar to those in the above embodiment will be described with the same reference numerals.

The temporary support spacer 1 of this embodiment has an engaging portion 51 on the outer circumferential wall 12 and the inner circumferential wall 13 that form the exposed portion 50. The engaging portion 51 is an engaging hole having a circular opening provided in the outer circumferential wall 12 and the inner circumferential wall 13 in a direction (radial direction) intersecting with the direction in which the insertion hole 10 extends. Four engaging portions 51 are provided on the outer circumferential wall 12 and the inner circumferential wall 13 in the circumferential direction at approximately 90° intervals. The engaging portion 51 of the outer circumferential wall 12 and the engaging portion 51 of the inner circumferential wall 13 are provided to face each other and overlap in the radial direction.

When pulling out the temporary post spacer 1, insert the tip of a tool such as a ratchet 7 into the engaging portion 51 of the outer circumferential wall 12 and the inner circumferential wall 13 from the direction (radial direction) that intersects with the direction in which the insertion hole 10 extends, and By rotating the support spacer 1 around the axis O, the temporary support spacer 1 can be easily removed.

In this way, when a radial opening is provided in the outer peripheral wall 12 as the engaging portion 51, there is a risk that the poured concrete may enter the inside through the opening. By adopting the double wall structure of the wall 12 and the inner peripheral wall 13, even if concrete enters from the engaging portion 51 of the outer peripheral wall 12, it can be dropped between the outer peripheral wall 12 and the inner peripheral wall 13. , it is possible to prevent intrusion into the inside of the insertion hole 10.

(Embodiment 5)
Next, a temporary support spacer 1 according to a fifth embodiment will be described based on FIGS. 14 and 15. Note that descriptions of configurations similar to those of the above embodiment will be omitted. Components similar to those in the above embodiment will be described with the same reference numerals.

The temporary support spacer 1 of this embodiment does not have a double wall structure like the above-described embodiments 1 to 4, but the outer periphery of the insertion hole 10 is formed by the peripheral wall 11 from the base 20 to the exposed part 50. There is.

Specifically, a seal portion 30 is formed continuously from the base 20 in the upper part of the base 20, in which the outer circumferential surface of the peripheral wall 11 contacts the inner circumferential surface of the sheath tube 4. In the seal portion 30, the circumferential wall 11 increases in diameter upward, and the outer circumferential surface is inclined upward away from the insertion hole 10. In the seal portion 30, the peripheral wall 11 is preferably sloped at a gentle angle, and in the embodiment, the peripheral wall 11 is sloped at an angle of 2.5° with respect to the axis O of the insertion hole 10. The seal portion 30 prevents the concrete 5 from entering the inside of the sheath pipe 4.

An exposed portion 50 is formed at the upper portion of the seal portion 30 and continues from the seal portion 30 . The exposed portion 50 is a portion exposed upward from the surface of the poured concrete 5, and is formed by the outer circumferential wall 12 and the inner circumferential wall 13 extending in the vertical direction.

At the upper end of the exposed portion 50, an engagement wall 53 protrudes radially outward from the outer peripheral surface of the peripheral wall 11. The engagement wall 53 is formed into a cylindrical shape including a part of the peripheral wall 11, and the engagement portion 51 is formed inside the engagement wall 53. The engagement portion 51 is an engagement hole surrounded by the engagement wall 53 and the peripheral wall 11. The engaging portion 51 extends in the direction of extension of the insertion hole 10 and has openings at the upper and lower ends.

When pulling out the temporary support spacer 1, it is easy to pull out the temporary support spacer 1 by inserting the tip of a tool such as a ratchet 7 into the opening of the engaging part 51 from above and rotating the temporary support spacer 1 around the axis O. The temporary support spacer 1 can then be removed.

The above embodiments are merely illustrative in all respects and should not be interpreted in a limiting manner. Furthermore, all modifications and changes that come within the scope of equivalents of the claims are intended to be within the scope of the present invention.

For example, in Embodiments 1 to 4 above, the tapered part 40 and the exposed part 50 have a double peripheral wall structure with the inner peripheral wall 13 and the outer peripheral wall 12, but the present invention is not limited to this. The outer circumferential surface whose diameter is expanded may be formed from one circumferential wall. Further, the engaging portion may have any form as long as it can be configured to easily pull out the temporary support spacer by engaging a tool or the like when removing the temporary support support. Moreover, the number of engaging parts is also arbitrary.

1 Spacer for temporary support 2 Temporary support 3 Reinforced beam 4 Sheath pipe 5 Concrete 6 Mortar 10 Insertion hole 11 Peripheral wall 12 Outer peripheral wall 12a Inner peripheral surface 12b Outer peripheral surface 13 Inner peripheral wall 13a Inner peripheral surface 13b Outer peripheral surface 20 Base 30 Seal portion 40 Taper Part 50 Exposed part 51 Engagement part O Axis of insertion hole

Claims (3)

A temporary support spacer for curing the temporary support by being attached between the sheath pipe and the temporary support when installing the temporary support by inserting the temporary support into the sheath pipe and pouring concrete,
a base inserted into the sheath;
an exposed portion formed above the base and exposed from the surface of the poured concrete;
a cylindrical body having an insertion hole extending vertically from the base to the exposed part;
A spacer for a temporary support column, wherein the exposed part has an engaging part formed to be engageable with a tool. a seal portion between the base portion and the exposed portion, the outer circumferential surface of which slopes upwardly away from the insertion hole; A tapered part that slopes away,
The angle of inclination of the outer peripheral surface of the tapered portion with respect to the axis of the insertion hole is larger than the angle of inclination of the outer peripheral surface of the seal portion with respect to the axis of the insertion hole. Spacer for temporary support. According to claim 1, the engagement portion is an engagement hole that is provided on the outer periphery of the insertion hole and has an opening in an extending direction of the insertion hole or a direction crossing the extension direction of the insertion hole. Spacer for temporary support as described.