JPH0721902U - Step tools - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a stepping tool that can be easily put on and taken off from a building and can put a foot on it stably and safely after mounting. [Structure] A fixing member 2 provided with an upward concave portion 2d and formed with a rearward facing leg portion 2b and fixed to a building steel frame 8, and an endless side which is opened from the side to be the attached portion 3a. A step member 3 having a corrugated upper portion, a pair of left and right rotation stopper projections 4 projecting from the mounted portion 3a and having a space for sandwiching the leg portion 2b of the fixing member 2, and a rotation stopper protrusion. A fixing bolt member 5 provided between the portion 4 and the attached portion 3a and a nut 6 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a step tool temporarily installed in a building construction site, a work site, or the like to secure a step for lifting work at a steel frame stage.

[0002]

[Prior art]

 During the construction of buildings and factories, after the steel frame is erected, it is necessary to sequentially assemble it, but it is necessary to provide temporary steps to secure a foothold for work in high places. As this step tool, it is widely practiced to secure the scaffold by welding and fixing one end of the rod so as to be horizontal to the side surface of the steel frame.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional stepping tool, the rod only projects from the side wall of the steel frame, and it is difficult to place or hold the foot, and there is a risk that it is slippery. Further, since the amount of protrusion is large, there is a drawback that the mounting base end must be melted and removed after the work is completed. The present invention has been made in view of the above problems, and an object of the present invention is to provide a stepping tool that can be easily attached to and detached from a building, and after mounting, can put a foot stably and safely.

[0004]

[Means for Solving the Problems]

 In the present invention, in order to achieve the above object, an upward recess is provided at one end of the main body, and rearward facing legs are formed on both sides of the main body. The fixing member that is fixed to the stepping member and the band plate is expanded from the side to be the attached part and the endless side is used as the stepping part, and the concave surface formed by notching the upper part of the stepping part is formed into a corrugated shape. Member, a pair of left and right anti-rotation projections that are provided so as to project from the attached portion of the step member toward the opposite side of the foot step portion, and have a space for sandwiching the leg portion of the fixing member, and the anti-rotation projections. A head portion whose rotation is restricted by the leg portion of the fixing member is provided at one end of a shaft portion which is provided between the mounting portion and the attached portion and which can be hooked in the upward recess. Engage the locking groove along the length direction from the end, and this locking groove is located in the middle of the shaft. The tip member has a spiral shape of approximately half circumference up to the fixing position, and a fixing bolt member whose end is directed slightly toward the other end, and an engagement protrusion engaged with the locking groove are projected on the inner peripheral surface. It is characterized in that it is provided with an installed nut.

[0005]

[Action]

 With the above configuration, when attaching the step tool, the legs of the fixing member are fixed beforehand to the steel frame to be the structure at a constant interval in the vertical direction, and after the steel frame is erected, the fixing member is placed in the upward recess of the fixing member. Hook the head side of the fixing bolt member.

At this time, the other end of the fixing bolt member is made to project toward the stepping portion side of the step member, and the engaging projection of the nut is engaged with the locking groove to move toward the one end side to move about a half circumference. Only rotate. Then, at the step member fixing position, the engaging projection is engaged with the end. Since this end is directed to the one end side, reverse rotation is restricted to prevent the nut from coming off, and if this position is set so that the nut contacts the step member and tightens it, On the other hand, the fixing bolt member is firmly fixed.

As described above, since the mounting work is a one-touch operation, the worker can sequentially mount the step members from the bottom on the erected steel frame. In this step member, since the concave surface of the stepping portion has a corrugated shape, the foot can be stably placed and the slip can be prevented. Further, since the step member has a shape in which the band plate is not a simple ring shape but expands from the attached portion toward the stepping portion side, twist deformation is prevented when weight is applied.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a step tool according to the present invention, and FIG. 2 is a sectional view of the step tool in a mounted state.

The step tool 1 is used as a scaffold for moving up and down along a steel frame before a temporary scaffold for a building is assembled, and includes a fixing member 2, a step member 3, and a rotation stop projection 4. A fixing bolt member 5 and a nut 6 are provided, and in this example, a plurality of them are fixed to a steel frame 8 having a square cross section that is erected at a building site of a building.

The fixing member 2 has a U-shaped cross section in which both sides of the fixing member main body 2a are bent to form bent portions 2b, and the upper end edge of the fixing member main body 2a is cut out in a U shape to form an upward recess 2d. Is made. The fixing member 2 is made of a steel material, and the end faces 2c of the bent portions 2b, 2b are welded to the side wall 8a of the steel frame 8 with the upward recessed portion 2d facing upward to firmly fix a plurality of them vertically. ing.

The step member 3 has a substantially fan-shaped plan view, and is formed by cutting a seamless pipe having a substantially fan-shaped cross section into a narrow width. The step member 3 is gradually expanded from the attached portion 3a side, which is the corner of the fan, and the linear portion facing the attached portion 3a is used as the foot step portion 3b. As a result, the strength is secured without increasing the wall thickness, it is possible to prevent the deformation when the foot is placed on the step member 3 and the weight is applied, and the overall weight can be reduced.

That is, when the step member 3 is formed into a rectangular shape or a rectangular shape, when a load is applied to the stepping portion 3b side, the parallel side portions are likely to be twisted, and the right side portion or the left side portion may be inclined and deformed downward. It was necessary to make it thick. However, if the fan shape is expanded from one side, the both side parts 3d and 3e are not parallel to each other, so that the strength against twisting is increased, and the wall thickness can be reduced accordingly. The step member 3 is preferably a seamless pipe, but a metal pipe having a strongly welded connecting portion may be used.

Further, the step member 3 is formed by notching the upper part on the side of the stepping portion 3b into a substantially concave shape slightly larger than the width of the foot and hand, and forming a concave surface 3c in a wavy shape. Further, the step member 3 has a bolt insertion hole 3f formed in the center of the attached portion 3a side so that the fixing bolt member 5 can be inserted from the rotation stopper projection 4 side.

The rotation stopping projection 4 is for preventing the step member 3 from rotating, has an inner diameter slightly larger than the outer diameter of the fixing member 2, and has a bolt insertion hole 4 a formed in the center thereof. . Then, the bolt insertion hole 4a is aligned with the bolt insertion hole 3f of the step member 3, and the back surface is welded to the side surface of the step member 3 to be integrally formed with the step member 3.

The fixing bolt member 5 is shown in FIG. 3, and a hexagonal head portion 5b having a lateral width substantially smaller than the inner diameter of the fixing member 2 is integrated with the shaft portion 5a. The fixing bolt member 5 has a linear shape from the tip 5c of the shaft portion toward the head 5b side, and has a substantially half-circular spiral up to the step member fixing position C, and the end 5e is directed toward the tip 5c. Two locking grooves 5d are carved symmetrically. The nut 6 has two engaging projections 6b projectingly provided on the inner peripheral surface 6a thereof to be engaged with the locking grooves 5d of the fixing bolt member 5.

However, when mounting the step tool 1, as shown in FIG. 5, the necessary number of the fixing members 2 are welded to the side wall 8a of the steel frame 8 in advance at intervals with which the worker 9 can easily go up. Keep it fixed. Of course, they may be appropriately fixed by welding at a construction site with a required gap.

Then, when a scaffold is required according to the work, the step member 3 is mounted in the up-down direction of the steel frame 8 before being erected or the steel frame 8 already erected. At this time, the shaft portion 5a of the fixing bolt member 5 is inserted from the bolt insertion hole 4a on the rotation stopper projection 4 side, and is projected inward of the step member 3 through the bolt insertion hole 3f of the step member 3. After inserting the washer 7 from the tip, the nut 6 is inserted into the locking groove 5d.

At this time, the nut 6 is fastened to the straight portion of the locking groove 5d to leave a space between the rotation stopping projection 4 and the head portion 5b. In this state, the shaft portion 5a is hooked in the upward recessed portion 2d, the nut 6 is moved from the tip 5c side to the head portion 5b side and half-turned along the spiral, and the nut 6 is stepped at the step member fixing position C. The engaging projection 6b is engaged with the end 5e while contacting the member 3. Since the end 5e is directed toward the tip 5c, the reverse rotation is restricted and the nut 6 is prevented from coming off.

After that, as shown in FIG. 6, the locking groove 5d on the tip 5c side is hit with a hammer or the like to provide a caulking portion 5f, thereby preventing the nut 6 from coming off. In this mounting operation, the step tool 1 is fixed so that the step member 3 is horizontal and parallel to the steel frame 8. As described above, the step tool 1 can be fixed to the steel frame 8 by hooking the fixing bolt member 5 in the upward recessed portion 2d and turning the nut 6 about a half turn, and the one-touch operation is sufficient. Becomes

It is also possible to step up the steel frames 8 that have been erected up and in order, and after mounting, the step tools 1 are arranged in a row in the vertical direction as shown in FIG. Become a state. Thereby, when the worker 9 works at a high place, the work can be started together with the attachment of the step tool 1. Further, in the case of the existing equipment, the step tool 1 can be used so as to climb up the ramp from a low place.

[0021] When going up and down, the footrest 3b has an annular fan shape, so that the foot can be stably placed, and the footrest 3b has the corrugated concave surface 3c. , Foot and hand slippage is prevented and safety is improved.

[0022]

[Effect of device]

 As described above, according to the present invention, the legs of the fixing member are fixed in advance to the steel frame of the building at regular intervals in the vertical direction, the fixing bolt member is hooked on the fixing member, and then the fixing member is fixed. By engaging the nut in the locking groove of the bolt member and rotating it approximately half a turn, the step member can be fixed, and the work becomes extremely simple. In addition, since the worker can sequentially attach the step members to the vertically installed steel frame from the bottom with one touch, workability is improved.

Further, in this step member, since the concave surface of the stepping portion is corrugated, slipping is prevented and safety is also improved. Further, since the step member has an annular shape in which the strip plate is expanded from one end, it is prevented from being twisted and deformed when a weight is applied, and it is not necessary to have a thick wall to prevent this twisting. It has the effect of reducing the weight.

[Brief description of drawings]

FIG. 1 is a perspective view of a step tool according to an embodiment of the present invention.

FIG. 2 is a sectional view of the step tool in a mounted state.

FIG. 3 is a side view of a fixing bolt member.

FIG. 4 is a front view of a nut.

FIG. 5 is an explanatory diagram showing a work of attaching a step member.

FIG. 6 is a plan view of a step tool.

FIG. 7 is an explanatory diagram showing a usage state.

[Explanation of symbols]

 2 Fixing member 3 Step member 4 Rotation stop protrusion 5 Fixing bolt member 6 Nut 8 Steel frame for construction

Claims (1)

[Scope of utility model registration request] 1. A main body is provided with an upward recess at one end edge thereof, and rearward-facing legs are formed on both sides of the main body.
A fixing member to which the rear end of this leg is fixed to a building steel frame, etc., and the endless side is made into a stepping part by expanding from the side where the band plate is made to be an attached part, and the upper part of this stepping part is A step member having a notched concave surface in a corrugated shape, and a pair of left and right rotations protruding from an attached portion of the step member toward the opposite side of the stepping portion and having an interval for sandwiching the leg portion of the fixing member. A head portion whose rotation is restricted by a leg portion of the fixing member at one end of a shaft portion which is provided between the stop protrusion portion and the rotation stop protrusion portion and the mounted portion and which can be hooked in the upward recess. Is provided, and a locking groove is formed along the length direction from the other end of the shaft portion, and the locking groove has a spiral shape of a substantially half circumference up to the step member fixing position in the middle of the shaft portion, and its end is A fixing bolt member slightly facing the other end side, and an engaging protrusion engaged with the engaging groove. A step tool including a nut protruding from the inner peripheral surface.