JP3973763B2 - Support for construction - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction support, and can be used when performing various kinds of construction such as erection of a construction material such as a concrete plate and a pillar, reconstruction work, and support of a temporary work scaffold.
[0002]
[Background]
When a building material such as a concrete plate is built during the building work, a support that can temporarily support the building material and adjust the building angle is used.
[0003]
The support described in Japanese Utility Model Publication No. 1-337057 is provided with two main hooks that can be stretched and hooked to both ends of the main body and hooked to a metal fitting attached to a concrete plate that is a construction object. Part. The main body of the support is composed of an outer tube and an inner tube inserted into the outer tube, and the outer tube and the inner tube are connected to each other by a turnbuckle mechanism using right and left screws so as to expand and contract. . In addition, a cylindrical member is rotatably fitted to the outside of the hook portion, and screws formed on the inner peripheral surface of these cylindrical members and the outer peripheral surface of the hook portion are screwed together, and the cylindrical member is rotated. This moves to the tip side of the hook part.
[0004]
When building and rebuilding concrete plates with this support, hook the hooks on both ends of the hooks on the concrete plate and then rotate the tube members of the hooks to hang the tube members. The hook is screwed to the side of the metal fitting, thereby preventing the hook from falling off the metal fitting by closing the opening of the hook. Next, the length of the main body is adjusted by the turnbuckle mechanism of the main body so that the concrete plate is built in at a predetermined angle.
[0005]
Japanese Utility Model Publication No. 50-911 also shows a structure for preventing the hook portion from falling off from a hook or the like by closing the opening of the hook portion. In this structure, the pin is provided with a pin, a wedge member that is movable in a direction perpendicular to the length direction of the main body portion, and a sliding member that is slidable in the length direction of the main body portion. By hitting the wedge member with a tool such as a hammer, the sliding member is moved to the tip side of the hook portion by the wedge action of the wedge member that receives the reaction force from the pin, thereby closing the opening of the hook portion. I have to.
[0006]
[Problems to be solved by the invention]
According to the support of No. 1-337057, the turnbuckle mechanism using the right and left screws exposed to the outside is adopted for the expansion and contraction structure of the main body, and the opening of the hook part is Since the screw exposed from the cylindrical member is formed on the outer peripheral surface of the hook portion for closing, for example, the concrete adheres to these screws during the construction work of a building material such as a concrete plate. There is a problem that it becomes difficult to work to extend and contract the main body by the buckle mechanism, and it takes time and effort to close the opening of the hook part, and it adheres when this support is reused. There is also the problem that the concrete that has been removed must be removed, and there is also the risk of damaging the screws if the support is accidentally dropped. .
[0007]
On the other hand, in Japanese Utility Model Publication No. 50-911, such a problem does not occur because a screw is not employed. However, since a wedge member whose moving direction is perpendicular to the length direction of the main body is used, The size of the support in the direction becomes large. For this reason, in a place where there is not enough work space in this direction, it is difficult to work using the support and the handling becomes difficult.
[0008]
It is an object of the present invention to prevent the formation of a screw that is likely to adhere to or damage a foreign object such as concrete generated at a construction site, and has a dimension in a direction perpendicular to the length direction of the main body. It is to provide construction support that is smaller and easier to handle.
[0009]
[Means for Solving the Problems]
A construction support according to the present invention is a construction support having a telescopic main body portion and two hook portions that are provided at both ends of the main body portion and can be hooked on a construction object. An inner peripheral surface screw member having a screw formed on the peripheral surface, and an end portion on the inner peripheral surface screw member side are inserted into the inner peripheral surface screw member, and the end portion is screwed to the inner peripheral surface screw. The screw includes an outer peripheral surface screw member formed on the outer peripheral surface, and the main body portion expands and contracts by relative rotation between the outer peripheral surface screw member and the inner peripheral surface screw member.
[0010]
In this support, when relative rotation is generated between the outer peripheral surface screw member and the inner peripheral surface screw member, that is, the inner peripheral surface screw member is rotated relative to the outer peripheral surface screw member, or the inner peripheral surface screw member is rotated. By rotating the outer peripheral surface screw member, the main body can be expanded and contracted, and the screw at the end on the inner peripheral surface screw member side of the outer peripheral surface screw member is always inserted into the inner peripheral surface screw member. As shown in the figure, by setting the length in the longitudinal direction of the main body portion of the screw of the outer peripheral surface screw member and the screw of the inner peripheral surface screw member, the screw exposed to the outside can be eliminated. Therefore, it is possible to eliminate the adhesion of foreign matters such as concrete generated at construction sites such as buildings, and the screw is not damaged even if the support is accidentally dropped.
[0011]
In addition, since the expansion and contraction of the main body portion is performed by causing relative rotation between the outer peripheral surface screw member and the inner peripheral surface screw member, the structure for that purpose does not increase the size in the direction perpendicular to the length direction of the main body portion. Therefore, the handling becomes easy.
[0012]
In the above support, the main body portion may be constituted only by the outer peripheral surface screw member and the inner peripheral surface screw member, or may be constituted by adding other members to these members.
[0013]
In the former case, one of the two hook portions at the end of the outer peripheral surface screw member opposite to the inner peripheral surface screw member side is opposite to the outer peripheral surface screw member side of the inner peripheral surface screw member. The other end will be provided at the end of the side, but these hook parts are hooked on the construction object such as concrete plate, so in the case of this former, the inner peripheral surface screw member and the outer peripheral surface A hook portion provided on a member to be rotated among the screw members can be always hooked on a construction object such as a concrete plate by being rotatable with respect to this member.
[0014]
In the latter example, the inner peripheral surface screw member is a short cylindrical handle member that is rotated, and the outer peripheral surface screw member is a long first rod-like member provided with one of two hook portions at the tip. The outer peripheral surface thread is formed at the base end of the first rod-like member on the handle member side, and the handle member is rotatable relative to the handle member at the end opposite to the one hook portion. And connecting the second rod-like member having the other of the two hook portions at the tip thereof to the main body through the cylindrical connecting member.
[0015]
According to this, the main body portion is composed of the handle member, the cylindrical connecting member, and the first and second rod-like members, and the main body portion can be expanded and contracted by rotating the handle member. Since the second rod-shaped member does not rotate, the hook portions provided at the respective tips of the first and second rod-shaped members can be fixed to these rod-shaped members, and unlike the former, it is not necessary to make the hook portions rotatable. Therefore, the attachment strength of the hook portion with respect to the main body portion can be increased accordingly.
[0016]
In this latter case, the second rod-shaped member is slidably inserted into the cylindrical connecting member, and a plurality of holes are formed in the second rod-shaped member at intervals in the length direction. When any one of the holes and the hole formed in the cylindrical connecting member are made to coincide with each other, a pin may be freely inserted into these holes.
[0017]
In this case, the second bar-shaped member can be coupled to the cylindrical coupling member and the handle member to which the cylindrical coupling member is rotatably coupled by the pin, and the pin is removed to form the cylindrical coupling member. On the other hand, by sliding the second rod-shaped member, the holes of the second rod-shaped member to be matched with the holes of the cylindrical coupling member are made different, and pins are attached to the holes of the cylindrical coupling member and the new holes of the second rod-shaped member. When inserted, the amount of protrusion of the second bar-shaped member from the handle member can be changed, and the overall length of the main body can be greatly changed. When a pin is inserted or removed, a large change in the overall length of the main body can be used as a rough adjustment of the support length. By combining these fine adjustment and coarse adjustment, the support length can be finely adjusted within a large range. It becomes so that.
[0018]
In the above, the handle member may be provided with one or a plurality of operation protrusions for allowing the operator to easily rotate the handle member, and is not provided with such a protrusion. It may be a simple short tube shape, or it may have a hole into which an operation bar such as Shino can be inserted, and the handle member can be rotated with the bar inserted into this hole. The hole may be formed in the operation protrusion.
[0019]
Further, the first rod-like member and the second rod-like member have the same diameter, and the sliding of the second rod-shaped member toward the first rod-shaped member with respect to the cylindrical connecting member is abutted against the first rod-shaped member. However, at least the first rod-shaped member of the first rod-shaped member and the second rod-shaped member is hollow, and the inner diameter of the first rod-shaped member is larger than the outer diameter of the second rod-shaped member. More preferably, the second rod-like member can be inserted inside.
[0020]
If it does in this way, the length adjustment range of a main-body part can be enlarged by insertion of the 2nd rod-shaped member inside the 1st rod-shaped member.
[0021]
The construction support according to the present invention is a construction support having a main body portion and two hook portions that are provided at both ends of the main body portion and can be hooked on a construction object. A cylindrical member is rotatably fitted, and a hook is formed on the hook portion so as to protrude in an outer diameter direction of the cylindrical member. The cylindrical member is engaged with the protrusion and rotates in the rotational direction of the cylindrical member. An extending spiral portion is formed.
[0022]
According to this support, when the spiral part of the cylindrical member is engaged with the protrusion of the hook part and the cylindrical member is rotated, the cylindrical member moves to the tip side of the hook part by the feeding action of the spiral part. Will close the opening. This prevents the hook portion from falling off the construction object.
[0023]
In this support, the spiral portion of the cylindrical member may be a spiral groove formed on the inner peripheral surface of the cylindrical member, and this end surface is formed by spirally forming the end surface on the main body side of the cylindrical member in the rotational direction of the cylindrical member. It is good also as a spiral part.
[0024]
In any case, the exposed screw is not formed on the hook part or the cylinder member. For this reason, the foreign matter such as concrete generated at the construction site adheres to the screw and closes the opening of the hook part. Conventional problems such as troublesome work can be solved, and the hook part only needs to be provided with a rotatable cylindrical member, so the length of the body part in the direction perpendicular to the length direction does not increase. Support can be handled easily.
[0025]
In addition, although the spiral part provided in a cylinder member may be the spiral groove formed in the internal peripheral surface of a cylinder member as mentioned above, it is more preferable to make this spiral part into the end surface at the side of the main body part of a cylinder member. In this case, since the end surface of the cylindrical member appears outside, it can be easily and reliably confirmed whether or not the protrusion of the hook portion is engaged with the spiral portion, and the spiral portion is formed on the cylindrical member. Work can be done easily.
[0026]
Moreover, it is preferable to form the notch part which the protrusion before engaging with a spiral part can penetrate | invade in a cylinder member, and has the depth to the front end side of a hook part.
[0027]
If such a notch is provided in the cylindrical member, the cylindrical member is moved from the tip side of the hook part to the main body part side by allowing the protrusion before engaging with the spiral part to enter the notch part. Since it moves backward by the depth, the work object can be easily hooked from the opening to the hook portion, and this hooking operation can be simplified.
[0028]
The above construction support according to the present invention can be used for building construction materials such as concrete plates and pillars at the construction site, rebuilding these materials, etc., and joining at a right angle etc. on the horizontal plane. It can also be used to set the angle between two building materials, and can also be used to attach and support temporary structures such as work scaffolds to structures such as buildings and bridges. It is applicable to various constructions such as civil engineering work.
[0029]
Further, the counterpart to which the hook portion of the support according to the present invention is hooked may be a hanging member such as a U-shaped bracket attached to the construction object such as a concrete plate, or the construction object itself, for example, the construction object is a concrete plate. In this case, it may be a reinforcing bar embedded in the concrete plate and exposed to the outside, and can be arbitrarily determined according to the type, structure, etc. of the construction object for which the support is used.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a support 3 according to the present embodiment that is used when a concrete plate 2 is built into a floor slab 1 of a building, and FIG. 2 is an enlarged view of a part of the support 3 omitted. . The support 3 includes a main body portion 4 and hook portions 5 provided at both ends of the main body portion 4, and a hanging member 6 including a U-shaped metal fitting 6 </ b> A on which these hook portions 5 are hooked. The floor slab 1 and the concrete plate 2 are attached in advance.
[0031]
The main body 4 has a short cylindrical shape and a handle member 7 having a plurality of operating projections 7A on the outer peripheral surface, and a first rod-like member 8 extending from the handle member 7 to one side, in the illustrated example, to the floor slab 1 side. The cylindrical connecting member 9 is attached to the other end face of the handle member 7, and the second bar-shaped member 10 extends from the cylindrical connecting member 9 to the opposite side of the first bar-shaped member 8.
[0032]
As shown in FIG. 4, a screw 11 is formed on the inner peripheral surface of the handle member 7 over the entire length of the handle member 7 excluding the inner end portion on the first rod-like member 8 side. A screw 12 is provided as a stopper member. A screw 13 is formed on the outer peripheral surface of the end of the first rod-shaped member 8 on the handle member 7 side. In the present embodiment, the screw 13 has an outer periphery of the screw 13 on the end of the first rod-shaped member 8 on the handle member 7 side. The screw tube member 14 formed on the surface is provided by being fixed. In the present embodiment, the handle member 7 is an inner peripheral surface screw member by the screw 11 on the inner peripheral surface, and the first rod-like member 8 is an outer peripheral surface screw member by the screw 13 on the outer peripheral surface.
[0033]
Further, the cylindrical connecting member 9 is rotatable with respect to the handle member 7 when the flange 9A is held between the holder member 15 fixed to the end of the handle member 7 and the handle member 7. The end of the second rod-shaped member 10 on the handle member 7 side is inserted into the tubular connecting member 9. Both the first rod-like member 8 and the second rod-like member 10 are hollow members, and the inner diameter of the first rod-like member 8 is larger than the outer diameter of the second rod-like member 10, and accordingly, the two-dot chain line 10 'in FIG. As shown, the second rod-shaped member 10 can be inserted into the first rod-shaped member 8.
[0034]
A hole 16 penetrating in the diameter direction is formed in the cylindrical connecting member 9, and a hole 17 in the same direction is also formed in the second rod-shaped member 10. As shown in FIGS. 2 and 3, a plurality of holes 17 in the second rod-shaped member 10 are provided at intervals in the length direction of the second rod-shaped member 10. For this reason, when the second rod-shaped member 10 is slid with respect to the handle member 7 and the cylindrical connecting member 9, the hole 16 of the cylindrical connecting member 9 and one of the plurality of holes 17 of the second rod-shaped member 10. The two rod-shaped members 10 can be fixed to the handle member 7 and the cylindrical connecting member 9 at the positions by inserting the pins 18 of FIG. 4 into these holes 16 and 17. Further, when the pin 18 is pulled out and the second rod-shaped member 10 is slid, the new hole 17 of the second rod-shaped member 10 is aligned with the hole 16 of the cylindrical connecting member 9, and the pin 18 is inserted into these holes, The protrusion amount of the second rod-shaped member 10 from the handle member 7 can be changed.
[0035]
The specific structure of the hook portion 5 is shown in FIGS. 5 to 7, and FIG. 7 is a sectional view taken along line VII-VII in FIG. As shown in FIG. 7, the hook portion 5 is obtained by fixing a hook member 19 to the tips of the first rod-like member 8 and the second rod-like member 10 of the main body portion 4 by welding, and the hook member 19 is a first rod-like member. 8, a large-diameter base end portion 19A applied to the tip of the second rod-shaped member 10 and welded thereto, a narrow neck portion 19B extending from the base end portion 19A to the tip end side of the hook member 19, and a neck portion 19B A guide portion 19C that is formed at the front portion and has a diameter smaller than that of the base end portion 19A, and a flange portion 19D that extends in a curved shape from the distal end of the guide portion 19C and that has an opening 20 formed between the guide portion 19C. Become. Further, as shown in FIG. 7, the neck portion 19 </ b> B is formed with a protrusion 21 that protrudes in the outer diameter direction of the main body portion 4 adjacent to the guide portion 19 </ b> C.
[0036]
The cylindrical member 22 is fitted to the outside of the guide portion 19C of the hook member 19 having the above shape, and the cylindrical member 22 has an inner diameter corresponding to the outer diameter of the guide portion 19C. However, it is rotatable with respect to the hook member 19 and is slidable in the axial direction of the hook member 19, and is used for rotating and sliding the cylindrical member 22 on the outer peripheral surface of the cylindrical member 22. A plurality of operating protrusions 22A are provided. The end face of the cylinder member 22 on the main body part 4 side is not a cut end that coincides with the diameter direction of the cylinder member 22, and becomes a spiral portion 23 that extends in the axial direction of the cylinder member 22 as it extends in the rotation direction of the cylinder member 22. ing.
[0037]
Further, a notch 24 having a depth toward the distal end side of the hook member 19 is formed on the end surface of the cylinder member 22 on the main body part 4 side, and the notch 24 is formed in a spiral shape as shown in FIGS. The cylindrical member 22 in the portion 23 is provided between the axial start and end portions 23A and 23B.
[0038]
Next, how to use the support 3 will be described. First, the position of the projection 21 of the hook member 19 protruding in the outer diameter direction of the cylindrical member 22 and the position of the notch 24 of the cylindrical member 22 are matched, and then the cylindrical member 22 is retracted toward the main body 4 side. Thus, the protrusion 21 is caused to enter the notch 24 and the opening 20 of the hook member 19 is sufficiently opened. Also, the pin 18 shown in FIG. 4 is pulled out, and the second rod-like member 10 of the main body 4 is slid with respect to the handle member 7 and the cylindrical connecting member 9, whereby the overall length of the main body 4 is reduced to the floor. The holes 16 of the cylindrical connecting member 9 and the holes 17 of the second rod-shaped member 10 that correspond to the interval between the hanging members 6 that are attached in advance to the slab 1 and the concrete plate 2 are aligned. The pin 18 is inserted, and the entire length of the main body 4 is fixed to that length.
[0039]
Next, the U-shaped metal fittings 6 </ b> A of the hanging members 6 of the floor slab 1 and the concrete plate 2 are hooked and inserted into the flange portions 19 </ b> D of the hook members 19 at both ends of the support 3 from the openings 20 of the hook members 19. Thereafter, the cylindrical member 22 of each hook member 19 is slid toward the distal end side of the hook member 19, thereby causing the protrusion 21 to escape from the notch 24, and then the cylindrical member 22 at the operation protrusion 22 </ b> A of the cylindrical member 22. Is rotated counterclockwise in FIG. As a result, the projection 21 is engaged with the spiral portion 23 of the cylindrical member 22 through the start end portion 23A, and further rotates the cylindrical member 22, whereby the cylindrical portion 22 is screwed by the spiral portion 23 with which the projection 21 abuts. As shown by a two-dot chain line 22 'in FIGS. 6 and 7, the member 22 is moved to the tip end side of the hook member 19, and finally the operation protrusion 22A is hit with a tool such as a hammer so that the cylindrical member 22 is moved. The hook member 6 is moved until it hits the U-shaped metal fitting 6A, thereby closing the opening 20 with the tubular member 22 and preventing the U-shaped metal fitting 6A from escaping from the flange portion 19D of the hook member 19.
[0040]
As a result, the concrete plate 2 built in the floor slab 1 is supported by the support 3 as shown in FIGS.
[0041]
Thereafter, by operating the operating projection 7A formed on the handle member 7 by hand, or as shown in FIG. 4, the hole 7B provided in the operating projection 7A has a bar shape such as Shino. When the tool is inserted and this tool is operated, the handle member 7 is rotated. As a result, the first rod-like member 8 in which the outer peripheral surface screw 13 is screwed with the above-described inner peripheral surface screw 11 of the handle member 7 is in contact with the handle member 7 as shown by a two-dot chain line 8 'in FIG. The screw tube member 14 attached to the first rod-shaped member 8 is moved to the flange 9A of the cylindrical connecting member 9 disposed at one end of the handle member 7, and the other end. The main body 4 is expanded and contracted by the movement of the first rod-shaped member 8 with respect to the handle member 7, and the length of the main body 4 is adjusted.
[0042]
Thereby, the erection angle of the concrete plate 2 with respect to the floor slab 1 is adjusted.
[0043]
After the concrete slab 2 is fixed to a clasp or the like not shown in the building, the support 3 can be detached from the hanging member 6 by performing the reverse operation to the above, and the support 3 It can be reused for building concrete plates.
[0044]
According to this embodiment described above, the structure for expanding and contracting the main body 4 is such that the outer peripheral surface screw 12 of the first rod-shaped member 8 is screwed to the inner peripheral surface screw 11 of the handle member 7 that is rotated. In addition, the body portion 4 has no external screws, and the structure in which the cylindrical member 22 is slid toward the distal end side of the hook member 19 in order to close the opening 20 of the hook member 19 is A protrusion 21 protruding in the outer diameter direction of 22 is formed, and this protrusion 21 is engaged with a spiral portion 23 formed on the end surface of the cylindrical member 22. Even if the support 3 is used at a construction site such as a building where there are many foreign objects such as concrete, the foreign object adheres to the screw, and the expansion and contraction work of the main body 4 and the opening 20 of the hook member 19 are not formed. The work of closing with 22 Not become a flame, and it no accident that would damage the screw occurs when dropped accidentally support 3, it is possible to ensure over the original function of the support 3 a long period of time.
[0045]
The length of the main body 4 is adjusted by rotating the handle member 7, and the operation of sliding the cylindrical member 22 toward the distal end side of the hook member 19 is also performed by rotating the cylindrical member 22. 4 and the hook part 5 do not have a large dimension in the direction perpendicular to the length direction of the main body part 4, and as a result, handling of the support 3 becomes easy.
[0046]
Further, the main body portion 4 is configured to include a second rod-shaped member 10 extending on the opposite side to the first rod-shaped member 8, and a plurality of holes 17 are formed in the second rod-shaped member 10. The entire length of the main body 4 can be adjusted stepwise by selecting the hole for inserting the pin 18 from the hole 17 so as to coincide with the hole 16 of the cylindrical connecting member 9, and by rotating the handle member 7. When the expansion and contraction of the main body 4 is finely adjusted, this stepwise adjustment can be a rough adjustment of the main body 4, and the axial length of the inner peripheral surface screw 11 of the handle member 7 determines the first rod-shaped member 8. By adjusting the length obtained by subtracting the axial length of the outer peripheral surface screw 13 to be equal to or longer than the intervals of the plurality of holes 17 provided at equal intervals in the second rod-shaped member 10, rough adjustment is performed. The length of the main body 4 can be finely adjusted over the entire range. .
[0047]
In the present embodiment, since the inner diameter of the hollow first rod-shaped member 8 is larger than the outer diameter of the second rod-shaped member 10, when the length of the main body 4 is roughly adjusted, The second rod-shaped member 10 can be inserted (a two-dot chain line 5 ′ in FIG. 3 indicates the hook portion 5 on the second rod-shaped member 10 side when the second rod-shaped member 10 is inserted into the first rod-shaped member 8). For this reason, the rough adjustment length of the main-body part 4 can be made into the long range which can be used for various construction.
[0048]
Further, since the spiral portion 23 for moving the cylindrical member 22 to the distal end side of the hook portion 19 in cooperation with the protrusion 21 is an end surface that appears outside the cylindrical member 22, the spiral portion is located inside the cylindrical member 22. Unlike the case where the peripheral surface is formed as a spiral groove, the spiral portion 23 can be easily formed, and the effect that the engagement of the protrusion 21 with the spiral portion 23 can be reliably and easily confirmed can be obtained.
[0049]
Further, the protrusion 21 before engaging with the spiral portion 23 can be caused to enter the notch 24 of the tube member 22 by retracting the tube member 22 toward the main body portion 4, and the notch 24 is formed in the hook member 19. Therefore, the opening 20 of the hook portion 19 can be greatly opened at the rear end of the cylindrical member 22, and the U-shaped fitting 6 </ b> A of the hanging member 6 can be opened from the opening 20. The operation of hooking on the flange portion 19D of the hook member 19 can be easily performed.
[0050]
【The invention's effect】
The support according to the present invention does not have a screw that is exposed to the outside and may be damaged by foreign matters such as concrete generated at a construction site, and thus the support can be operated as prescribed. In addition, the size of the main body portion in the direction perpendicular to the length direction can be reduced, and the support can be easily handled.
[Brief description of the drawings]
FIG. 1 is a perspective view showing when a concrete plate is built on a floor slab with a support according to an embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a floor slab and a concrete slab in which a part of a support is omitted.
FIG. 3 is a partially omitted side view showing only a support.
FIG. 4 is a composite view of a semi-cylindrical section showing a main body portion of a support.
FIG. 5 is a perspective view showing a state before a cylindrical member is fitted to a hook portion of a support.
6 is a side view of the hook portion. FIG. 7 is a sectional view taken along line VII-VII in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 Support 4 Main-body part 5 Hook part 6 Hanging member 7 Handle member 8 1st rod-shaped member 9 Tubular connecting member 10 2nd rod-shaped member 11, 13 Screw 16, 17 Hole 18 Pin 19 Hook member 20 Opening 21 Protrusion 22 Cylindrical member 23 Spiral part 24 Missing part

Claims (1)

In a construction support having a main body portion and two hook portions that are provided at both ends of the main body portion and can be hooked on a work object, a cylindrical member is slidable in an axial direction on the outside of the hook portion. The hook portion is freely fitted, and a protrusion protruding in the outer diameter direction of the cylindrical member is formed on the hook portion, and the end surface on the body portion side of the cylindrical member is engaged with the protrusion and the cylindrical portion It is a spiral part extending in the rotation direction of the member, and the cylindrical member can be penetrated by the protrusion before engaging with the spiral part and has a depth toward the tip side of the hook part Support for construction, characterized in that is formed .

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