Temporary support spacers

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

[Technical Field]

[0001] The present invention relates to a spacer for a temporary support. [Background technology]

[0002] Conventionally, when installing temporary structures such as handrails, a temporary support spacer is used between a cylindrical sheath pipe fixed to a beam or the like and a support pole inserted into the sheath pipe. When concrete is poured and the support pole is 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 temporary support spacer can be removed from the sheath pipe, making it easy to remove the support pole.

[0003] As such a spacer for a temporary support, Patent Document 1 discloses a joint that prevents handrails from shaking and reduces the effort required to remove the handrails. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-270143 Summary of the Invention [Problem to be solved by the invention]

[0005] Carbon dioxide and sulfur dioxide gases in exhaust gases penetrate concrete from the exposed surface, causing a carbonation reaction, which leads to a deterioration phenomenon known as carbonation. There are concerns that carbonation may also affect the durability of structures. In the civil engineering and construction industries, in order to prevent carbonation of concrete from reaching the reinforcing steel of buildings, it is common to ensure a sufficient cover dimension between the concrete surface and the reinforcing steel.

[0006] In temporary structures such as handrails, it is preferable to ensure a sufficient cover dimension from the concrete surface to the top end of the sheath pipe. However, if a large cover dimension is ensured for a temporary structure, the temporary support spacer will be embedded in the concrete to a greater extent, making it difficult to remove. Patent Document 1 does not consider the issue of how to make the temporary support spacer easier to remove when a sufficient cover dimension is ensured for a temporary structure.

[0007] The present invention has been made in consideration of the above points, and provides a spacer for temporary supports that can ensure sufficient cover dimensions to maintain the durability of the structure and can also be easily removed. [Means for solving the problem]

[0008] In order to achieve the above object, in the first invention, A temporary support spacer for curing a temporary support by being attached between the sheath pipe and the temporary support when the temporary support is inserted into the sheath pipe and concrete is poured into the temporary support, a base portion inserted into the sheath tube; an exposed portion formed above the base and exposed from the surface of the poured concrete; a cylindrical body having an insertion hole penetrating in the vertical direction from the base portion to the exposed portion, The exposed portion has an engaging portion formed so that a tool can be engaged therewith.

[0009] According to the above configuration, when removing the temporary support inserted into the insertion hole, the temporary support spacer can be easily pulled out of the concrete by engaging the engaging part provided on the exposed part with a tool. This makes it possible to ensure a larger cover dimension from the concrete surface to the upper end of the sheath pipe compared to a spacer without an engaging part.

[0010] In the second invention, in the first invention, a seal portion between the base portion and the exposed portion, the outer peripheral surface of which is inclined upward so as to move away from the insertion hole, and a tapered portion of which the outer peripheral surface is inclined upward from an upper portion of the seal portion so as to move further away from the insertion hole, The inclination angle of the outer peripheral surface of the tapered portion relative to the axis of the insertion hole is larger than the inclination angle of the outer peripheral surface of the seal portion relative to the axis of the insertion hole.

[0011] According to the above configuration, by making the sealing portion and the tapered portion have different inclination angles and expanding the diameter in two stages, the sealing portion can reliably prevent concrete from entering the inside of the sheath pipe, and the tapered portion can fully demonstrate the effect of making it easier to remove the temporary support spacer when removing the temporary support, making it possible to sufficiently ensure the cover dimension X from the top end of the sheath pipe to the concrete surface.

[0012] In the third invention, in the first invention, The engaging portion is an engaging hole that is provided on the outer periphery of the insertion hole and has an opening in the extension direction of the insertion hole or in a direction intersecting with the extension direction of the insertion hole.

[0013] According to the above configuration, the tip of a tool such as a ratchet can be inserted into the opening of the engagement hole to engage it, making it easier to pull out the temporary support spacer, thereby ensuring a large covering dimension. [Effects of the Invention]

[0014] As described above, according to the present invention, it is possible to provide a spacer for a temporary support that can ensure sufficient covering dimensions to maintain the durability of the structure and that can be easily removed. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view of a main part of a temporary support using a temporary support spacer according to the first embodiment. [Figure 2]FIG. 1 is a perspective view of a temporary support spacer according to a first embodiment. [Figure 3] FIG. 1 is a side view of a temporary support spacer according to a first embodiment. [Figure 4] FIG. 1 is a plan view of a temporary support spacer according to a first embodiment. [Figure 5] FIG. 4 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] 10A to 10C are diagrams showing the procedure for installing a temporary support using a temporary support spacer. [Figure 8] 10A to 10C are diagrams showing the procedure for installing a temporary support using a temporary support spacer. [Figure 9] 10A to 10C are diagrams showing the procedure for installing a temporary support using a temporary support spacer. [Figure 10] 10A to 10C are diagrams showing the procedure for installing a temporary support using a temporary support spacer. [Figure 11] FIG. 10 is a perspective view of a temporary support spacer according to a second embodiment. [Figure 12] FIG. 10 is a perspective view of a temporary support spacer according to a third embodiment. [Figure 13] FIG. 10 is a perspective view of a temporary support spacer according to a fourth embodiment. [Figure 14] FIG. 10 is a perspective view of a temporary support spacer according to a fifth embodiment. [Figure 15] FIG. 10 is a vertical cross-sectional view of a temporary support spacer according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] (Embodiment 1) Hereinafter, a temporary support spacer according to an embodiment will be described with reference to the drawings.

[0017] Fig. 1 is a cross-sectional view of a main part of a temporary support using a temporary support spacer according to embodiment 1. As shown in Fig. 1, the temporary support spacer 1 according to the embodiment of the present invention is attached between the sheath pipe 4 and the temporary support 2 to cure the temporary support 2 when a temporary support 2 used for a structure such as a temporary handrail is inserted into a sheath pipe 4 fixed to the top surface of a reinforcing beam 3 and concrete 5 is poured to install the temporary support 2.

[0018] Fig. 2 is a perspective view of the temporary support spacer, Fig. 3 is a side view, Fig. 4 is a plan view, Fig. 5 is a cross-sectional view taken along line VV in Fig. 3, and Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 3. Specifically, the temporary support spacer 1 is a cylindrical body having an insertion hole 10 passing through in the vertical direction as shown in Figs. 2 to 6, and is molded from synthetic resin.

[0019] The temporary support spacer 1 has a base 20 at its lower end that is inserted into the sheath pipe 4. The cylindrical peripheral wall 11 that forms the base 20 has an outer diameter that is smaller than the inner diameter of the sheath pipe 4 and an inner diameter that is larger than the outer diameter of the temporary support 2, has a uniform thickness, and extends in a substantially vertical direction. The base 20 also has a plurality of slits 21 that narrow upward from the lower end. There is no limit to the number of slits 21, but in this embodiment, six slits 21 are formed at equal intervals in the circumferential direction, as shown in Figure 5.

[0020] A seal portion 30 is formed continuously from the base portion 20 at the upper part of the base portion 20, with the outer peripheral surface of the peripheral wall 11 abutting against the inner peripheral surface of the sheath pipe 4. In the seal portion 30, the peripheral wall 11 expands in diameter upward, and the outer peripheral surface is inclined upward so as to move away from the insertion hole 10. In the seal portion 30, the peripheral wall 11 is preferably inclined at a gentle angle, and in this embodiment, the inclination angle is 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.

[0021] A tapered portion 40 is formed at the top of the seal portion 30, continuing from the seal portion 30. The tapered portion 40 is formed so that the outer peripheral surface 12b is inclined upward so as to move further away from the insertion hole 10, and the inner peripheral surface 13a that forms the insertion hole 10 inside the outer peripheral surface 12b extends approximately vertically.

[0022] 1 and 6 , the tapered portion 40 has a double-wall structure in which the peripheral wall 11 that forms the base portion 20 and the seal portion 30 is divided into an outer peripheral wall 12 and an inner peripheral wall 13 from above the seal portion 30, and the tapered portion 40 has the inner peripheral wall 13 that extends in a substantially vertical direction radially inward from the axis O of the insertion hole 10, and the outer peripheral wall 12 that expands in diameter upward and away from the inner peripheral wall 13 radially outward from the inner peripheral wall 13. The inner peripheral wall 13 forms the 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.

[0023] The length dimension of the temporary support spacer 1 is designed so that the surface of the poured concrete 5 is located at the tapered portion 40. Therefore, the outer peripheral surface 12b of the outer peripheral wall 12 comes into contact with the concrete 5. In the tapered portion 40, the outer peripheral surface 12b is inclined at an angle of approximately 15° with respect to the axis O of the insertion hole 10. In other words, the inclination angle of the outer peripheral surface 12b of the outer peripheral 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 peripheral surface of the peripheral wall 11 in the sealing portion 30 with respect to the axis O of the insertion hole 10.

[0024] In this way, by making the sealing portion 30 and the tapered portion 40 have different inclination angles and expanding the diameter in two stages, the sealing portion 30 can reliably prevent the concrete 5 from entering the inside of the sheath pipe 4, and the tapered portion 40 can fully exert the effect of making it easier to remove the temporary support spacer 1 when removing the temporary support 2, so that the cover dimension X from the upper end of the sheath pipe 4 to the surface of the concrete 5 can be sufficiently secured.

[0025] An exposed portion 50 is formed at the top of the tapered portion 40. The exposed portion 50 is a portion that is exposed upward from the surface of the poured concrete 5, and is formed by the outer peripheral wall 12 and the inner peripheral wall 13 extending in the vertical direction. At the upper end of the exposed portion 50, a flange portion 52 is formed by the outer peripheral wall 12 extending radially outward.

[0026] The exposed portion 50 also has an engaging portion 51 formed to be able to engage with the tip of a tool such as a ratchet. Specifically, the engaging portion 51 is an engaging hole formed between the outer peripheral wall 12 and the inner peripheral wall 13 so as to have an opening in the extension direction of the insertion hole 10. In this embodiment, the engaging portion 51 is an engaging hole having an opening that opens upward between the outer peripheral wall 12 and the inner peripheral wall 13. A pair of partition walls 14 is provided in the hollowed portion between the outer peripheral wall 12 and the inner peripheral wall 13 so as to connect the outer peripheral wall 12 and the inner peripheral wall 13. The engaging portion 51 is formed between the pair of partition walls 14. In a plan view as shown in FIG. 4 , the engaging portion 51 has a semi-elliptical shape, has an opening at the upper end of the tapered portion 40, and four engaging portions 51 are provided at approximately 90° intervals in the circumferential direction.

[0027] (Installation and removal of temporary supports) Next, the procedure for installing the temporary support 2 using the temporary support spacer 1 will be described with reference to FIGS. 7 and 8, and the procedure for removing the temporary support 2 will be described with reference to FIGS.

[0028] First, as shown in Figure 7, the sheath pipe 4, which is a cylindrical metal member, is placed vertically on the top surface of the reinforcing beam 3 and fixed by welding. The base 20 of the temporary support spacer 1 is inserted into the cylindrical interior of the sheath pipe 4. The upper end of the sheath pipe 4 is located at the seal portion 30, where the outer surface of the peripheral wall 11 abuts against the inner surface of the sheath pipe 4.

[0029] Next, as shown in Figure 8, the temporary support 2 is inserted into the insertion hole 10 of the temporary support spacer 1, and the temporary support 2 is attached to the sheath pipe 4 via the temporary support spacer 1. The temporary support 2 is fixed in place by the temporary support spacer 1. In this state, concrete 5 is poured on top of the reinforcing beam 3 so that a sufficient cover dimension X is secured between the top end of the sheath pipe 4 and the surface of the concrete 5. The top surface of the concrete 5 is located at the tapered portion 40. In this way, the temporary support 2 is installed.

[0030] When removing the temporary support 2, the temporary support spacer 1 is pulled out from the surface of the concrete 5, and the temporary support 2 is also pulled out. The worker can remove the temporary support spacer 1 by grasping the exposed portion 50 and rotating the temporary support spacer 1 around the temporary support 2. The larger the cover dimension X, the more difficult it is to remove the temporary support spacer 1, but in this embodiment, the temporary support spacer 1 can be easily removed even if the cover dimension X is 30 mm.

[0031] If the temporary support spacer 1 is difficult to remove after the temporary support 2 has been pulled out from the surface of the concrete 5, a tool such as a ratchet 7 may be used, as shown in Fig. 9. By inserting the tip of the ratchet 7 into the opening of the engagement 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.

[0032] After the temporary support spacer 1 is pulled out from the concrete surface 5, the hole made by the temporary support spacer 1 and the temporary support 2 is backfilled with mortar as shown in Figure 10, and the removal work of the temporary support 2 is completed.

[0033] According to the temporary support spacer 1 of this embodiment configured as described above, even when the cover dimension X is large and the temporary support spacer 1 is difficult to remove, a worker can easily remove the temporary support spacer 1 by engaging a tool such as a ratchet 7 with the engaging portion 51 provided on the exposed portion 50 exposed from the concrete 5. Furthermore, by forming a tapered portion 40 that expands in diameter upward between the base portion 20 inserted into the sheath pipe 4 and the exposed portion 50, and casting the concrete 5 so that the surface of the concrete 5 is positioned at the tapered portion 40, the temporary support spacer 1 can be easily removed even when the cover dimension X is larger. Furthermore, by providing a sealing portion 30 between the base portion 20 and the tapered portion 40, with an inclination angle smaller than that of the tapered portion 40, and by configuring the temporary support spacer 1 to be inclined in two stages, the sealing portion 30 can prevent the concrete 5 from penetrating into the sheath pipe 4, while enhancing the effect of the tapered portion 40 in facilitating removal.

[0034] (Embodiment 2) Next, a temporary support spacer 1 according to a second embodiment will be described with reference to Fig. 11. Note that a description of the same configuration as in the above embodiment will be omitted. The same components as in the above embodiment will be described with the same reference numerals.

[0035] The engagement portion 51 of the temporary support spacer 1 of this embodiment is an engagement hole having an opening that opens in the extension direction of the insertion hole 10 between the outer peripheral wall 12 and the inner peripheral wall 13. In this embodiment, the engagement portion 51 is an engagement hole having an opening that opens upward between the outer peripheral wall 12 and the inner peripheral wall 13, and a plurality of engagement portions 51 are formed circumferentially.

[0036] A plurality of partition walls 14 are formed in the hollowed-out portion between the outer peripheral wall 12 and the inner peripheral wall 13, connecting the outer peripheral wall 12 and the inner peripheral wall 13. The partition walls 14 are arranged radially around the axis and are provided at equal intervals. A tool can be engaged with the engagement portions 51 through openings defined in each partition wall 14. Twelve engagement portions 51 are provided, defined in the partition wall 14 at intervals of approximately 30° in the circumferential direction.

[0037] When pulling out the temporary support spacer 1, the tip of a tool such as a ratchet 7 is inserted from above into the opening of the engagement portion 51, and the temporary support spacer 1 is rotated around the axis O, making it possible to easily remove the temporary support spacer 1.

[0038] (Embodiment 3) Next, a temporary support spacer 1 according to a third embodiment will be described with reference to Fig. 12. Note that a description of the same configuration as in the above embodiment will be omitted. The same components as in the above embodiment will be denoted by the same reference numerals and will be described.

[0039] The temporary support spacer 1 of this embodiment has, in the exposed portion 50, a groove-shaped engaging portion 51 that divides the outer peripheral wall 12 and the inner peripheral wall 13 in the circumferential direction. When viewed from the side, the peripheral wall of the engaging portion 51 has a U-shaped engaging hole with an opening that opens in a direction (radial direction) that intersects with the extension direction of the insertion hole 10. The engaging portion 51 communicates with the insertion hole 10. The partition walls 14 that connect the outer peripheral wall 12 and the inner peripheral wall 13 constitute the peripheral walls on both sides of the engaging portion 51 in the circumferential direction. Four engaging portions 51 are provided circumferentially at intervals of approximately 90°.

[0040] When pulling out the temporary support spacer 1, the tip of a tool such as a ratchet 7 is inserted into the engagement portion 51 from the extension direction (upward) of the insertion hole 10 or from a direction intersecting the extension direction of the insertion hole 10 (radial direction), and the temporary support spacer 1 is rotated around the axis O, thereby making it possible to easily remove the temporary support spacer 1.

[0041] (Embodiment 4) Next, a temporary support spacer 1 according to a fourth embodiment will be described with reference to Fig. 13. Note that a description of the same configuration as in the above embodiment will be omitted. The same components as in the above embodiment will be described with the same reference numerals.

[0042] The temporary support spacer 1 of this embodiment has engagement portions 51 on the outer peripheral wall 12 and inner peripheral wall 13 that form the exposed portion 50. The engagement portions 51 are engagement holes with circular openings that are provided in the outer peripheral wall 12 and inner peripheral wall 13 in a direction (radial direction) that intersects with the extension direction of the insertion hole 10. Four engagement portions 51 are provided in the circumferential direction at intervals of approximately 90° on the outer peripheral wall 12 and inner peripheral wall 13. The engagement portions 51 on the outer peripheral wall 12 and the engagement portions 51 on the inner peripheral wall 13 are provided so as to face each other and overlap in the radial direction.

[0043] When pulling out the temporary support spacer 1, the tip of a tool such as a ratchet 7 is inserted into the engagement portion 51 of the outer wall 12 and the inner wall 13 from a direction (radial direction) intersecting the extension direction of the insertion hole 10, and the temporary support spacer 1 is rotated around the axis O, thereby making it possible to easily remove the temporary support spacer 1.

[0044] In this way, if a radial opening is provided in the outer wall 12 as the engagement portion 51, there is a risk that the poured concrete will enter the interior through the opening. However, by using a double wall structure consisting of the outer wall 12 and the inner wall 13 as in this embodiment, even if concrete enters through the engagement portion 51 of the outer wall 12, it can be dropped between the outer wall 12 and the inner wall 13, thereby preventing it from entering the interior of the insertion hole 10.

[0045] (Embodiment 5) Next, a temporary support spacer 1 according to a fifth embodiment will be described with reference to Figures 14 and 15. Note that a description of the same configuration as in the above embodiment will be omitted. The same components as in the above embodiment will be described with the same reference numerals.

[0046] The temporary support spacer 1 of this embodiment does not have a double wall structure as in the first to fourth embodiments, but has a peripheral wall 11 around the outer periphery of the insertion hole 10 from the base 20 to the exposed portion 50 .

[0047] Specifically, a seal portion 30 is formed continuously from the base portion 20 at the upper part of the base portion 20, with the outer peripheral surface of the peripheral wall 11 abutting against the inner peripheral surface of the sheath pipe 4. In the seal portion 30, the peripheral wall 11 expands in diameter upward, and the outer peripheral surface is inclined upward so as to move away from the insertion hole 10. In the seal portion 30, the peripheral wall 11 is preferably inclined at a gentle angle, and in this embodiment, the inclination angle is 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.

[0048] An exposed portion 50 is formed above the sealed portion 30, continuing from the sealed portion 30. The exposed portion 50 is a portion that is exposed upward from the surface of the poured concrete 5, and is formed by the outer peripheral wall 12 and the inner peripheral wall 13 extending in the vertical direction.

[0049] At the upper end of the exposed portion 50, an engagement wall 53 protrudes radially outward from the outer circumferential surface of the peripheral wall 11. The engagement wall 53 is formed in 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 engagement portion 51 extends in the extension direction of the insertion hole 10, and has openings at the upper and lower ends.

[0050] When pulling out the temporary support spacer 1, the tip of a tool such as a ratchet 7 is inserted from above into the opening of the engagement portion 51, and the temporary support spacer 1 is rotated around the axis O, making it possible to easily remove the temporary support spacer 1.

[0051] The above-described embodiments are merely examples in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention.

[0052] For example, in the above-described first to fourth embodiments, the tapered portion 40 and the exposed portion 50 have a double peripheral wall structure formed by the inner peripheral wall 13 and the outer peripheral wall 12, but this is not limiting and the tapered portion 40 and the exposed portion 50 may be formed from a single peripheral wall consisting of the inner peripheral surface forming the insertion hole and the outer peripheral surface with an expanded diameter. Furthermore, the engaging portion may have any shape as long as it is configured such that a tool or the like can be engaged with the engaging portion to easily extract the temporary support spacer when removing the temporary support. Furthermore, the number of engaging portions is also arbitrary. [Explanation of symbols]

[0053] 1 Temporary support spacer 2 Temporary Supports 3 Reinforced concrete beams 4. Sheath 5. Concrete 6. Mortar 10 Insertion hole 11 Surrounding wall 12 Peripheral wall 12a Inner surface 12b Outer surface 13 Inner wall 13a Inner surface 13b Outer surface 20 base 30 Seal part 40 Tapered section 50 Exposed part 51 Engagement portion O Axis of insertion hole

Claims

1. A temporary support spacer for curing a temporary support by being attached between the sheath pipe and the temporary support when the temporary support is inserted into the sheath pipe and concrete is poured into the temporary support, a base portion inserted into the sheath tube; an exposed portion formed above the base and exposed from the surface of the poured concrete; a cylindrical body having an insertion hole penetrating in the vertical direction from the base portion to the exposed portion, A spacer for a temporary support, wherein the exposed portion has an engaging portion formed so that a tool can be engaged therewith.

2. a seal portion between the base portion and the exposed portion, the outer peripheral surface of which is inclined upward so as to move away from the insertion hole, and a tapered portion of which the outer peripheral surface is inclined upward from an upper portion of the seal portion so as to move further away from the insertion hole, A spacer for a temporary support as described in claim 1, characterized in that the inclination angle of the outer surface of the tapered portion relative to the axis of the insertion hole is greater than the inclination angle of the outer surface of the sealing portion relative to the axis of the insertion hole.

3. The spacer for temporary supports according to claim 1, characterized in that the engagement portion is an engagement hole provided on the outer periphery of the insertion hole and having an opening in the extension direction of the insertion hole or in a direction intersecting the extension direction of the insertion hole.

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