JPH0743202U - Step tools - Google Patents

Abstract

(57) [Summary] [Objective] To provide a step tool which is easy to manufacture, is stably supported, and has a small amount of protrusion of metal fittings left on the steel frame after work. A fitting insertion member 5 having a bending portion 52 extending forward and a fitting insertion piece 51 protruding downward from the bending portion is provided at a front portion of a step member main body 4 formed by forming a band plate in an annular shape. And a step member 2 having the same inner width as that of the fitting insert piece, and a supporting wall 32 having a wall thickness that extends over the step member main body and the fitting insert piece. Is formed, and the front end 31a of the leg portion is provided with the support member 3 fixed to the building steel frame 7 and the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

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

[0002]

[Prior art]

 Construction of buildings and factories involves the work of sequentially assembling steel frames after they have been erected, but it is necessary to provide steps to secure a foothold for work in high places. Moreover, it is necessary that the step tool can be easily removed after the work is completed so as not to hinder the subsequent work.

Therefore, the applicant of the present application first devised and applied for a step tool for this purpose (Actual Publication No. 4-4200). As shown in FIG. 9, the step tool includes a support member A and a step member B.

In the support member, an upward recess a1 is provided in the center of the support wall a, leg portions a2 are formed on both sides in a forward direction, and the front ends of the leg portions are fixed to the building steel frame X and the like. The step member is a pair of left and right rotation stoppers projecting radially outward from the step member main body at an interval that sandwiches the leg portion of the support member with the step member main body B formed by a rectangular strip plate. It has a protrusion C and a head d1 whose rotation is restricted by the legs, can be hooked in the upward recess of the support member, and is provided between the rotation stop protrusions of the step member, and the nut d2 is inserted from inside the step member. The fixing bolt member D is tightened.

In order to use this step tool, first, a support member is first fixed in advance to a steel frame to be a structure at regular intervals in the vertical direction, and after the steel frame is erected, the support member is placed in an upward recess of the support member. , The shaft portion of the fixing bolt of the step member is fitted and inserted. Then, by tightening the nut, the step member is fixed to the support member for use. Conversely, the step member can be removed from the support member by loosening the nut.

[0006]

[Problems to be solved by the device]

 However, the above-mentioned step tool has a problem that it is necessary to provide the support member with the upward concave portion, which requires time and effort for production. Moreover, since a large amount of supporting members used at each construction site are welded and fixed to a steel frame to be a structure and are then thrown away, there is a problem that the process of forming an upward recess in the supporting member increases the cost.

The above-mentioned step tool has a structure in which the shaft portion of the fixing bolt of the step member is supported in the upward recess of the support member, and in order to prevent the step member from rotating around the shaft of the bolt and to stabilize it. It was also necessary to provide the step member with a rotation stop protrusion.

Since the above step tool has a configuration in which only the shaft portion of the fixing bolt provided on the step member is supported by the upward recess of the support member, the contact area for the support member to support the step member is small, and the bolt is small. Excessive shearing force was generated and the load on the fixing bolt was heavy.

In the above step tool, since the head of the bolt is inserted between the legs of the supporting member, the length of the leg needs to be larger than the length of the head of the bolt, and the protrusion from the supporting wall of the supporting member is required. I couldn't reduce the projecting length. The present invention has been made to solve these problems.

[0010]

[Means for Solving the Problems]

 According to the invention, a bent portion 52 extending forward from the step member main body 4 and a fitting insert protruding downward from the bent portion 52 are provided at a front portion of a step member main body 4 formed by forming a strip plate in an annular shape. The step member 2 including the insertion member 5 having the shape of 51 and an inner width substantially equal to that of the insertion member 51, and the support wall 32 is provided on the step member body 4 and the insertion member 51. And a supporting member 3 having a wall thickness extending over and extending forward on both sides, and a front end 31a of the leg 31 being fixed to the building steel frame 7 and the like. It is the step tool 1 to do.

The step member 2 penetrates the step member body 4 below the bent portion 52 of the fitting member 5, and a fixing bolt 6 is screwed so as to be able to move forward and backward from the inside of the step member body 4. It is a stepping tool 1 characterized by being formed.

In the step tool 1, the step member body 4 is provided with a through hole 46.

The step member main body 4 is formed in a substantially annular shape that is partially open, and the open end portions 43a are fixed with the connecting member 4a whose both end portions 41a are bent at intervals that sandwich the end portions 43a. It is a stepping tool 1 characterized by being formed.

[0014]

[Action]

 The leg portions 31 of the support member 3 are fixedly fixed to the steel frame 7 as a building at regular intervals in the vertical direction, and after the steel frame 7 is erected, the leg portions 31 of the support member 3 are fixed. The step insertion member 51 of the insertion insertion member 5 of the step member 2 is inserted into the insertion insertion gap 33 with the formed steel frame 7 to fix the step member 2 to the steel frame 7. At this time, the worker 8 can sequentially attach the step members 2 to the steel frame 7 that is erected from the bottom.

When the step tool 1 is used after the step member 2 is fixed to the support member 3, the fitting wall 51 of the support member 3 is sandwiched between the fitting insert piece 51 and the step member main body 4, and the fitting member is inserted. Since the lower surface 52a of the bent portion 52 of 5 is brought into contact with and supported by the upper surface 32a of the support member 3, and the fitting insert piece 51 of the fitting insertion member 5 is surrounded by the support wall 32 of the support member 3 and the leg portions 31 on both sides, The step member 2 is securely held by the support member 3.

At the time of work, since the step member main body 4 is formed in an annular shape, the worker 8 can hold the step member main body 4 at any side, and the upper surface thereof serves as a foot rest surface to stabilize the foot. It can be placed and it is possible to perform lifting work safely.

When the lifting step directly attached to the steel frame 7 becomes unnecessary due to a separate scaffold frame being assembled, the fitting insert 51 of the fitting insert member 5 is pulled out upward from the support member 3. By doing so, the step member 2 can be removed from the support member 3. At this time, the worker 8 can sequentially perform the removal work while going down from the top. Further, after the step member 2 is removed, only the supporting member 3 remains on the steel frame 7 and there is no hindrance to the subsequent work.

According to the second aspect of the present invention, after the step member 2 is attached to the support member 3, the fixing bolt 6 is tightened so as to be pressed against the support wall 32 of the support member 3 to fix the fixing bolt 6. The support wall 32 of the support member 3 is sandwiched between the tip and the insert 51, so that the step member 2 can be more reliably fixed.

According to the third aspect of the present invention, since the step member body 4 is provided with the through hole 46, the weight of the step member 2 can be reduced, so that the worker 8 goes up from bottom to top. Even when attaching the step members 2 or removing the step members 2 while descending from the top to the bottom, the weight of the plurality of step members 2 hanging down on the waist is reduced, and the burden on the worker 8 is reduced. , Work efficiency can be improved.

In the invention according to claim 4, the strip plate is formed in a substantially annular shape that is partially open, and the bent end portions 41a of the connecting member 4a are narrowed so as to narrow the gap between the open end portions 43a. Since both members can be locked by sandwiching with, the step member body 4 can be easily manufactured. This is because both ends 43a of the substantially annular step member 2 have an outward force acting to separate them from each other, and both ends 41a of the connecting member 4a have an inward force trying to approach each other. Therefore, both members can be easily positioned during welding.

[0021]

【Example】

 Hereinafter, the step tool of the present invention will be described in more detail. The step tool 1 of the present invention is used as a scaffold for climbing up and down the steel frame 7 before a temporary scaffold for a building is assembled. In this embodiment, as shown in FIG. 1, a plurality of steel frames 7 having a cross-section of a square shape, which are erected at a building construction site, are provided and used.

The step tool 1 of this embodiment comprises a step member 2 and a support member 3, and the step member 2 comprises a step member body 4, a fitting member 5 and a fixing bolt 6.

The step member main body 4 is formed by bending a strip plate into a hexagonal annular shape in which a long side 41 and a short side 42 are connected by a side 43 and a hypotenuse 44, respectively. The side 43 is bent at a right angle to the long side 41, and the oblique side 44 is bent at an angle of about 45 degrees with the short side 42.

In the present invention, the step member body 4 is not limited to such a hexagonal shape, but the bending angles of the side edges 43 and the hypotenuses 44 may be changed, and other shapes such as a circle, a rectangle, a square, and a hexagon may be used. Other polygons may be used, or an arbitrary curved shape may be formed.

However, as in this embodiment, the step member body 4 is formed by connecting the long side 41 and the short side 42 opposite to the long side 41 with the side 43 and the oblique side 44, respectively. It is desirable to do. Even if the insert member 5 is provided on the short side 42 and is fixed to a steel frame or the like, the short side 42 is less likely to be twisted than when the step member main body 4 is formed in a rectangular shape, and moreover, the foot can be placed easily. Because there are advantages.

As shown in FIG. 2, the step member main body 4 is formed by cutting out the long side 41 of the step member main body 4 to make it narrow, or by forming the notched upper surface in a serrated shape to facilitate holding, and the side edge 43. It is also possible to reduce the weight of the step member body 4 by forming a through hole 46 in the slanted side 44 or the like.

Further, as shown in FIG. 3, the strip plate is formed into a substantially hexagonal shape with the long side 41 open, and both end portions 43a of the open long side 41 are narrowed so as to reduce the distance between the both end portions 43a. The step member main body 4 may be formed by sandwiching both ends of the connecting member 4a having different lengths by being bent and sandwiching them. According to this structure, the outward force to separate from each other acts on both ends 43a of the substantially annular step member 2, and the inward direction to approach each other to both ends 41a of the connecting member 4a. Since force acts, positioning of both members at the time of welding is easy.

The fitting member 5 is fixed to the outside of the short side 42 of the step member body 4. As shown in FIG. 1, the insertion member 5 has a U-shape, and one side of the U-shape has a step member body 4 so that the upper bent portion 52 is located above the step member body 4. The other side of the U-shape, which is fixed to the outer peripheral surface of the short side 42 and projects downward from the bent portion 52, serves as the fitting insert piece 51.

Further, as shown in FIG. 4, the step member main body 4 is opened at the short side 42 by the width of the insertion member 5, and the U-shaped side of the insertion member 5 is opened at the open portion. You may pinch and fix.

Further, as shown in FIG. 7, the U-shaped central groove of the insertion member 5 is sandwiched between the short sides 42 of the step member body 4 from above, and one side of the U-shape is short side 42. It may be fixed to the inner peripheral surface of the.

It is desirable that the fitting piece 51 of the fitting member 5 be formed in a shape in which the lateral width slightly decreases as it goes downward.

In the insertion member 5, the insertion piece 51 is separated from the short side 42 of the step member body 4 to the outside, and a support described later is provided between the short side 42 of the step member body 4 and the insertion piece 51. The configuration is not limited to the U-shape as in the case of this embodiment, as long as the gap is formed to be slightly larger than the thickness of the support wall 32 of the member 3, and other shapes may be used. For example, one end of the short side of the L-shaped member may be fixed to the upper part of the peripheral side surface of the step member body 4.

At the fixing portion between the step member body 4 and the inserting member 5 located below the bent portion 52 of the inserting member 5, the short side 42 of the step member body 4 is penetrated to insert the bolt. Holes 45 and 53 are provided, and a fixing bolt 6 is screwed from the inside of the step member main body 4 so as to be movable back and forth.

In this case, as shown in FIG. 5, only the insertion hole 45 of the step member main body 4 is threaded, and the insertion hole 53 of the insertion member 5 is the insertion hole of the step member main body 4 in which the screw thread is engraved. The diameter may be larger than the diameter of 45. On the contrary, as shown in FIG. 7 (A), only the insertion hole 53 of the insertion member 5 is provided with a screw thread, and the insertion hole 45 of the step member body 4 is provided with the insertion hole of the insertion member 5 having a screw thread. The diameter may be larger than the diameter of 53. Further, as shown in FIG. 7B, a continuous thread may be formed on the insertion hole 45 of the step member body 4 and the insertion hole 53 of the fitting insertion member 5.

Further, as shown in FIG. 2, the bolt insertion holes 45 and 53 are formed to have a diameter larger than the shaft diameter of the fixing bolt 6, instead of carving threads on the bolt insertion holes 45 and 53, and the center of the bolt insertion holes 45 and 53 is formed. A nut 61 is fixed to the inside of the step member body 4 so as to coincide with the axis, and the fixing bolt 6 is attached to the nut 61 from the inside of the step member body 4 through the short side 42 of the step member body 4. It may be screwed so that it can move back and forth, and it is easier to manufacture if formed in this way.

The support member 3 has leg portions 31 formed on both sides of the support wall 32 and extending forward, and is made of a steel material having a U-shaped cross section. The left and right front ends 31 a of the leg portions 31 are welded to the side walls of the steel frame 7. Then, a plurality of them are firmly fixed and used in the vertical direction.

As shown in FIG. 7, when the fitting insertion piece 51 of the fitting insertion member 5 is fitted into the fitting insertion gap 33 between the leg portions 31 on the support wall 32 of the support member 3, the fitting is performed. The withdrawal hole 35 can be provided at a position where the lower end 51a of the insert piece 51 can be seen. In this case, the fitting insert piece 51 needs to project downward from the step member main body 4. By providing the removal hole 35, when the fitting piece 51 is removed from the fitting gap 33 of the support member 32, as shown in FIG. The step member 2 can be easily removed from the support member 3 by inserting the above and pushing the lower end 51a of the fitting insert 51 upward.

When the step tool 1 of the present invention is attached, the necessary number of the supporting members 3 are fixed to the side wall of the steel frame 7 in advance by a distance such that the worker 8 can easily go up. Of course, the required number of support members 3 may be fixed by welding at a construction site at a required interval.

Then, when a scaffold is required according to the work, the step member 2 is mounted in the vertical direction of the steel frame 7 before being erected or the steel frame 7 already erected. This is done by inserting the insert piece 51 of the insert member 5 of the step member 2 into the insert gap 33 between the legs 31 of the support member 3 formed between the support member 3 and the steel frame 7. At this time, by hitting the bent portion 52 on the upper portion of the insertion member 5 with a hammer or the like, it is possible to insert the insertion member 5 into the support member 3 more securely and securely.

As a result, as shown in FIG. 5, the lower surface 52 a of the bent portion 52 of the insertion member 5 is brought into contact with the upper surface 32 a of the support wall 32 of the support member 3, and the step member 2 is supported by the support member 3. To be done.

Further, by tightening the fixing bolt 6 so as to press it against the support wall 32 of the support member 3, as shown in FIGS. 5 and 6, the inner surface 54 of the fitting insert piece 51 of the fitting insert member 5 is supported. The step tool 1 is fixed to the steel frame 7 so that the step member 2 is brought into contact with the inner surface 34 of the member 3 so that the step member 2 is horizontal and parallel to the steel frame 7. Such mounting work can also be performed by moving up the steel frame 7 that has been erected and moving upwards in sequence, and after mounting, as shown in FIG. 8, the step tools 1 are arranged vertically. It becomes a trapezoid.

Accordingly, when the worker 8 works at a high place, the work can be started together with the mounting. In the case of existing equipment, the step tool 1 can be used as if going up the ramp from a low place. When going up and down, stability is good by using the upper surfaces of the long sides 41, the side edges 43, and the oblique sides 44 of the step member body 4 as foot mounting surfaces, and the step member 2 has an annular shape. It is easy to hold and enhances safety.

[0043]

[Effect of device]

 As described above, the step tool 1 of the present invention does not need to be provided with a notch such as an upward recess in the support member 3, is easy to manufacture, and can reduce the cost. In other words, since the support member 3 is used in large quantities at each construction site and is disposable, even if the cost reduction per unit is small, it is possible to realize a significant cost reduction by repeated use.

In the step tool 1 of the present invention, the insertion member 5 can be stably fixed without rotating by simply inserting the insertion member 5 into the support member 3, and it is not necessary to provide the step member 2 with the rotation stopping protrusion. .

Since the lower surface 52a of the bent portion 52 of the insertion member 5 is supported by contacting the upper surface 32a of the support member 3 with the step member 2, the contact area where the support member 3 supports the step member 2 is small. Large and stable support.

The insertion wall 51 and the short side 42 of the step member 2 sandwich the support wall 32 of the support member 3, and the lower surface 52 a of the bent portion 52 of the insertion member 5 is brought into contact with and supported by the upper surface 32 a of the support member 3. Since the insert piece 51 of the insert member 5 is surrounded by the support wall 32 of the support member 3 and the leg portions 31 on both sides, the step member 2 is securely held by the support member 3.

Since the length of the leg portion 31 of the support member 3 need only be formed by a gap corresponding to the plate thickness of the fitting member 5, the size of the support member 3 can be made smaller than the structure in which the bolt head is inserted. Therefore, even when the step tool 1 is no longer needed and is removed, there is no hindrance to the subsequent work.

According to the second aspect of the invention, after the fitting insert piece of the fitting insert member 5 is fitted into the support member 3, the fixing bolt 6 is tightened so as to be pressed against the support wall 32 of the support member 3. It is possible to attach the step tool 1 more stably and safely.

According to the invention of claim 3, since the step member body 4 is provided with the through hole 46, the weight of the step member 2 can be reduced, and the worker 8 climbs from bottom to top while stepping up. When the member 2 is attached, or conversely, when the step member 2 is removed while descending from above, it is possible to easily perform the work while hanging a plurality of step members 2 on the waist.

According to the invention of claim 4, since the connecting member 4a can urge the two members by urging in a direction of narrowing the gap between the open end portions 43a of the step member 2, the two members can be positioned during welding. Can be done easily and is easy to manufacture.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing another embodiment of the step member of the step tool of the present invention.

FIG. 3 is a perspective view showing another embodiment of the step member of the step tool of the present invention.

FIG. 4 is a perspective view showing another embodiment of the step member of the step tool of the present invention.

FIG. 5 is a vertical cross-sectional view of a central portion of an embodiment of the step tool of the present invention.

FIG. 6 is a plan view of an embodiment of the step tool of the present invention.

FIG. 7 is a vertical sectional view of a central portion of another embodiment of the step tool according to the present invention.

FIG. 8 is an explanatory view showing a usage state of the step tool of the present invention.

FIG. 9 is a perspective view showing a conventional step tool.

[Explanation of symbols]

 1 step tool 2 step member 3 support member 4 step member main body 4a connecting member 5 fitting member 6 fixing bolt 7 building (steel frame) 8 worker 31 leg 31a leg front end 32 support wall 41 long side 41a bent end 42 short side 43 side 43a open end 44 oblique side 46 through hole 51 fitting insert 52 bent section

Claims (4)

[Scope of utility model registration request] 1. A fitting insert having a bent portion extending forward from the step member main body, and a fitting insert projecting downward from the bent portion, in a front portion of a step member main body formed by forming a strip plate into an annular shape. A step member provided with a member, having an inner width substantially equal to that of the fitting insert piece, and a support wall having a wall thickness that extends over the step member body and the fitting insert piece,
A step tool comprising: a leg member extending forwardly on both sides; and a support member having a front end of the leg member fixed to a building steel frame or the like. 2. The step member penetrates the step member body below a bent portion of the fitting member, and a fixing bolt is screwed forward and backward from the inside of the step member body. A step tool according to claim 1, characterized in that the utility model is registered. 3. The step tool according to claim 1 or 2, wherein the step member body is provided with a through hole. 4. The step member main body is formed in a substantially annular shape that is partially open, and a connecting member whose both ends are bent is fixed to the both open ends so as to sandwich the both ends. A step tool according to any one of claims 1 to 3, characterized in that the utility model registration claim.