JP6482336B2 - Clamp type support for round tube support - Google Patents

Description

  The present invention relates to a clamp-type support for a round tube column that can be suitably used for a master rope column installed on a high platform.

  As a protective measure to prevent the operator from falling at a high place scaffolding, etc., a plurality of parent ropes are set up at predetermined intervals around the scaffold, and the parent ropes are stretched between these parent ropes. Is well known. A threading ring is provided at the upper end of the master rope support, and the master rope is passed through the threading ring. In addition, a clamp-type support leg is provided at the lower end portion of the master rope support, and the clamped support leg clamps the object to be attached (such as the H-shaped steel flange part that constitutes the platform for high altitude) up and down. The master rope is fixed.

Since the master rope and the master rope support are not fixed, and the master rope is flexible unlike pipe materials, the load generated on the master rope is caused by shaking and unpredictable changes in the tensile direction. Along with this, it will be transmitted to the master rope as a complicated behavior. Therefore, a strong support strength is required for each master rope support.
In addition, there is a stanchion that is similar to the parent rope. The stanchion is assembled in a book-like form by connecting the struts with handrail pipes, and its overall structure increases rigidity. From these differences, it is clear that the parent brace struts require stronger support strength than the stanchions. Therefore, in this specification, “master rope support” and “stansion” are distinguished. In addition, some of these master rope columns and stanches have a column portion formed of a square tube or a shape steel, but the present invention is premised on a column tube.

Conventionally, the main support strut has a clamp-type support leg so that sufficient tension can be exerted against loads from any direction when the tension of the main rope is bent in the orthogonal direction at the position of the support. Has been proposed and patented (see Patent Document 1). In this master rope support (hereinafter referred to as “first conventional product”), a clamp-type support leg is provided with three or more bolts.
On the other hand, by improving the first conventional product, it is possible to reduce the weight while maintaining a strong support strength, and to carry out the transfer between the height platform and the ground or the storage warehouse easily. Furthermore, a master rope support having further improved clamp type support legs has been proposed and patented (see Patent Document 2). This master rope support (hereinafter referred to as “second conventional product”) has a configuration in which the number of bolts provided in the clamp-type support leg is reduced to two.

Japanese Patent No. 3881649 Japanese Patent No. 5314994

  The second conventional product is sufficiently lightened, and the burden on the operator who transports a large number of parent rope struts between the height platform and the ground is drastically reduced. However, it is not rare that the height difference between the height platform and the ground is several tens of meters, and there are cases where the number of parent rope supports is several hundred or more. Although the burden on the people was reduced, it was still not enough.

  The present invention has been made in view of the above circumstances, and maintains a strong support strength in a clamp-type support leg that can be suitably used in a master rope support or a stanchion for standing a round tube support. An object of the present invention is to provide a clamp-type supporting leg for a round tube support which can be further reduced in weight.

In order to achieve the above object, the present invention has taken the following measures.
That is, the clamp type support for a round tube column according to the present invention is joined to the column holding unit provided with column holes for inserting and standing the lower end of the round tube column, and the right and left sides of the column holding unit. A pair of left and right clamp frames provided in a protruding state toward the mounting target body, and the center of the support hole is expanded so that the left and right clamp frames protrude from the support holder. In the clamp type fulcrum for a round tube column that is joined in a diagonal direction that is symmetrical with respect to the boundary, the clamp frame has an upper jaw portion and a lower jaw portion that are arranged to sandwich the attachment object from above and below. It is formed by a U-shaped plate material integrated through a web part used for joining to the support column holding part, and an open space is formed between the lower jaw parts of the left and right clamp frames. And left and right Between the upper jaw portions of the clamp frame, a bolt support portion for a clamp bolt in which a female screw hole penetrating in the vertical direction is arranged on the left and right center line between the clamp frames, and the bolt in the protruding direction of the clamp frame A front beam portion that spans between the clamp frames at a position on the front side of the support portion, and a position that is on the rear side of the bolt support portion in the projecting direction of the clamp frame between the clamp frames. And the front beam part and the middle beam part are interconnected in a state where the bolt support part is sandwiched from the front and the back, so that the upper jaw parts of the left and right clamp frames are rigid board bodies. It is said that it is said.

It is preferable that the bolt support portion is provided with only one female screw hole.
It is preferable that a corner reinforcing material that is reinforced by increasing the thickness toward the outer surface side of the corner portion extending between the web portion and the lower jaw portion is attached to the clamp frame.

  According to the present invention, in a clamp type support leg that can be suitably used in a master rope support or a stanchion for standing a round tube support, further weight reduction can be achieved while maintaining a strong support strength. it can.

It is the top view which showed the clamp type supporting leg which concerns on this invention. It is the side view which showed the clamp type supporting leg which concerns on this invention. It is the front view which showed the clamp type supporting leg which concerns on this invention. It is a schematic plan view of the clamp type support leg explaining the load which acts centering on a bolt support part. It is the side view which showed the master rope support | pillar comprised by including the clamp type supporting leg which concerns on this invention. It is a sectional side view which shows the state which couple | bonded the round pipe support | pillar to the clamp type supporting leg which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show a clamp-type support leg 1 according to the present invention. FIG. 5 and FIG. 6 show a master rope support 3 that is constructed by vertically supporting a support 2 formed of a round tube with respect to the clamp type support leg 1.
In this master rope 3, at the upper end of the pillar 2, through rings 4 for passing the master rope are provided at a plurality of locations around the support 2 at equal intervals (four locations every 90 ° in the example). ing. The through-wheel 4 is fixed so as to straddle two swivel rings 5 and 5 that are rotatably fitted to the support column 2, and is held so as to be rotatable around the support column 2 together with the swivel rings 5 and 5. . Therefore, the extending direction of the master rope (not shown) with respect to the support column 2 is not limited at all. The swiveling rings 5 and 5 are prevented from moving in the axial direction with respect to the support column 2 (they are prevented from coming off) by bolts 8 provided so as to pass through the support column 2 therebetween.

In this specification, for convenience of explanation, the vertical direction in FIG. 5 is referred to as “vertical direction” or “vertical direction” as it is, and the horizontal direction in FIG. 5 is “front-rear direction (right side in FIG. 5 is“ front ”” and left side in FIG. Later ")". Also, the vertical direction in FIG.
The clamp-type support leg 1 has a support column holding portion 6 and a pair of left and right clamp frames 7 and 7 provided in a protruding state from the left and right sides of the support column holding portion 6 toward the front. The support holder 6 and the clamp frames 7 and 7 are fixed by welding. The left and right clamp frames 7, 7 are directed obliquely in a projecting angle in a plan view with respect to the column holding part 6 so as to enlarge each other as it protrudes forward from the column holding part 6.

  The column support 6 is formed by a round tube. The inside of the tube of the round tube has an inner diameter that allows the column 2 to be inserted without rattling. A column hole 10 for inserting the lower end of the column 2 to stand up is formed by this tube. The support holder 6 is formed with two distribution holes distributed in the front-rear direction so as to pass through the tube diameter. The two distribution holes are provided with radial through-holes provided at the lower end of the support 2. It is a structure in which the column 2 is prevented from coming off and the height is set by inserting the stoppers 11 such as bolts, straight pins, taper pins, wedges, etc. in a skewered manner.

  The clamp frame 7 is formed of a U-shaped plate material in which an upper jaw portion 15 and a lower jaw portion 16 are integrated via a web portion 17. In the present embodiment, a steel plate having a thickness of 9 mm is used in order to increase weight reduction and obtain high strength. The upper jaw portion 15 and the lower jaw portion 16 are parallel to each other in the forward direction, and an attachment target body (such as a flange portion of H-shaped steel that constitutes a height platform) is sandwiched from above and below between these upper and lower portions. A clamping space is formed. The web portion 17 is used for joining (welding) to the support column holding portion 6.

  In addition, in the situation where both clamp frames 7 and 7 hold the object to be attached from above and below, the support holder 6 has both clamp frames 7 and 7 so that the supported support 2 is separated from the object to be attached as the upper end portion. On the other hand, the support | pillar holding | maintenance part 6 is making the standing angle in a side view inclined backward. Therefore, there is an advantage that the work place formed on the upper part of the attachment object can be widely used. A specific standing angle (backward inclination angle) is not particularly limited.

  As described above, the protruding directions of the left and right clamp frames 7 and 7 are directed obliquely in a plan view with respect to the column holding part 6, but the respective protruding angles are the centers of the column holes 10 in the column holding unit 6. It is symmetrical with respect to the border. The protruding ends of the lower jaw parts 16 and 16 are not connected to each other, and therefore, an open space opened between the lower jaw parts 16 and 16 at an equal distance from the center of the support hole 10 in the support holder 6. 20 is formed.

On the other hand, a bolt support portion 23, a front beam portion 24, and a middle beam portion 25 are provided between the upper jaw portions 15, 15 of the left and right clamp frames 7, 7. The front beam portion 24 and the middle beam portion 25 not only reinforce the bolt support portion 23, but also serve as a reinforcement measure for the upper jaw portions 15, 15 in the left and right clamp frames 7, 7.
The bolt support portion 23 is a portion into which the clamp bolt 26 is screwed, and has a female screw hole 27 penetrating in the vertical direction. In this embodiment, the bolt support portion 23 is formed by a hexagon nut whose outer periphery is surrounded by six flat surfaces, and the pair of flat surfaces of the outer periphery are arranged so as to face the front and the rear, respectively. The bolt support portion 23 is arranged so that the female screw hole 27 coincides with the center line between the left and right clamp frames 7 and 7. In the bolt support portion 23, only one (only) female screw hole 27 is provided.

  The front beam portion 24 is bridged between the clamp frames 7 and 7 at a position on the front side of the bolt support portion 23, and is brought into contact with the bolt support portion 23 in a surface contact manner at the center portion of the bridge. . In the present embodiment, the left and right end portions of the front beam portion 24 are made to coincide with the protruding ends of the upper jaw portion 15. On the other hand, the intermediate beam portion 25 is bridged between the clamp frames 7 and 7 at a position on the rear side of the bolt support portion 23, and is in surface contact with the bolt support portion 23 at the center portion of the bridge. It is in contact.

  That is, the bolt support portion 23 is sandwiched from the front and rear by the front beam portion 24 and the middle beam portion 25. The portions where the bolt support portion 23 and the front beam portion 24 and the bolt support portion 23 and the intermediate beam portion 25 are in surface contact are connected to each other by welding. In this manner, the bolt support portion 23 is sandwiched from the front and rear by the front beam portion 24 and the middle beam portion 25, and the front beam portion 24 and the middle beam portion 25 further connect the left and right clamp frames 7, 7 to the upper jaw portions 15, 15. It is a structure connected between them.

FIG. 4 is a schematic plan view of the clamp-type support leg 1 illustrating the load acting on the bolt support portion 23. The virtual triangle A-B-C obtained by setting the center of the female screw hole 27 in the bolt support portion 23 as the point A and the two points where the front beam portion 24 is joined to each upper jaw portion 15 as B and C is It is an isosceles triangle whose apex angle is the center of the screw hole 27. The virtual triangle A-D-E obtained by setting the two points D and E where the left and right clamp frames 7 and 7 are joined to the support holder 6 to the female screw hole 2
This is an isosceles triangle having an apex angle at the center of 7. Therefore, the virtual triangles ABD and ACE that are distributed between the two isosceles triangles and distributed to the left and right sides are congruent to each other.

  Therefore, when the clamp bolt 26 screwed into the female screw hole 27 of the bolt support portion 23 is tightened, a clamping force is generated on the mounting target body between the clamp bolt 26 and the lower jaw portions 15 and 15. The component force generated in the left and right clamp frames 7 and 7 (upper jaw portions 15 and 15) with the female screw hole 27 of the bolt support portion 23 as the center (corresponding to a position where the attachment target body is pressed by the lower end of the clamp bolt 26) is It is clear that the left and right are evenly distributed. As a result, the space between the upper jaws 15 and 15 in the left and right clamp frames 7 and 7 is a rigid board, and exhibits a strong clamping force as the clamp-type support leg 1, which is sufficient as the parent rope support 3. It contributes to securing the support strength.

  In contrast to the reinforcement measures for the upper jaw portions 15 and 15, the reinforcement measures for the lower jaw portions 16 and 16 are as follows. That is, a corner reinforcing member 30 is attached to the clamp frame 7 to reinforce the corner portion extending between the web portion 17 and the lower jaw portion 16 by increasing the thickness toward the outer surface. In the present embodiment, a plate material formed in an L shape is used for the corner reinforcing member 30. The plate material was a steel plate having a plate thickness of 9 mm as with the clamp frame 7. Therefore, the clamp frame 7 is formed such that the portion where the corner reinforcing member 30 is attached is twice as thick (18 mm) as the other portions.

Therefore, when a load is generated in the falling direction with respect to the support column 2 supported by the support column holding portion 6, the stress that tends to concentrate at the corner portion between the web portion 17 and the lower jaw portion 16 is caused by the corner reinforcing material 30. It is properly relaxed and absorbed, and cracks and bends at the corners are surely prevented.
By the way, as shown in FIGS. 5 and 6, the support post 2 combined with the clamp type support leg 1 according to the present invention has an exterior pipe 32 extending over its entire length and an intermediate reinforcement of 60% length built in the exterior pipe 32. It is preferable to use a pipe having a multilayer structure including a pipe 33 and a 20% -long internal reinforcing pipe 34 which is built in the intermediate reinforcing pipe 33 and fixed by end welding. A portable handle 35 may be folded and attached to the midway part of the exterior pipe 32 in the longitudinal direction so as to be foldable.

As is clear from the above detailed description, in the clamp type support leg 1 according to the present invention, the upper jaw portions 15 and 15 in the left and right clamp frames 7 and 7 are formed as a rigid board so that the strength is not lowered. Only the clamp bolt 26 is provided. Therefore, further weight reduction can be achieved while maintaining a strong support strength.
In addition, since the lower jaw parts 16 and 16 in the left and right clamp frames 7 and 7 are not connected to each other and an open space 20 having a wide mouth is formed, the attachment object is an H-shaped steel or the like. Not only the side edge portion but also the end portion (the web portion connecting the upper and lower flange portions exists) can be attached without any problem.

Of course, since only one clamp bolt 26 is required, there is an advantage that attachment and detachment from the attachment object can be performed easily and in a short time.
By the way, this invention is not limited to embodiment, It can change suitably according to embodiment.
For example, in the bolt support portion 23, a plurality of female screw holes 27 may be provided, but only one clamp bolt is used as the entire clamp type support leg 1.

The bolt support portion 23 is not limited to be formed by a hexagon nut, and may be formed by providing a female screw hole 27 penetrating in a vertical direction with respect to a plate material, a square bar material, or the like.
The supporting column 6 is not limited to be formed by a round tube, but can be formed by a square tube or the like as long as it has a supporting column hole 10 into which the lower end of the supporting column 2 can be inserted.

The case where the H-shaped steel is mainly used as the attachment target body has been described, but various types of steel bars and steel plates other than the H-shaped steel may be used. Further, the use is not limited except that a column formed by a round tube is used as the support column 2, and it can be configured as a stanchion in addition to being configured as the master rope support column 3.
The threading ring 4 may be fixed to the support 2.

DESCRIPTION OF SYMBOLS 1 Clamp type support leg 2 Support | pillar 3 Parent rope support | pillar 4 Thread ring 5 Rotating ring 6 Support support part 7 Clamp frame 8 Bolt 10 Support hole 11 Retaining stopper 15 Upper jaw part 16 Lower jaw part 17 Web part 20 Open space 23 Bolt support part 24 Front Beam part 25 Middle beam part 26 Clamp bolt 27 Female thread hole 30 Corner reinforcement 32 Exterior pipe 33 Intermediate reinforcement pipe 34 Internal reinforcement pipe 35 Handle

Claims (3)

A column holding part provided with a column hole to insert and stand the lower end of the round column column, and
A pair of left and right clamp frames that are joined to the left and right sides of the support column holding part and provided in a protruding state toward the front mounting object,
In addition, a clamp-type supporting leg for a round tube column that is joined in a diagonal direction that is symmetrical with respect to the center of the column hole so that the left and right clamp frames protrude from the column holding part. In
The clamp frame is formed of a U-shaped plate material in which an upper jaw portion and a lower jaw portion arranged so as to sandwich the attachment target body from above and below are integrated via a web portion used for joining to the support column holding portion. Has been
An open space is formed between the lower jaws of the left and right clamp frames by non-connection,
Between the upper jaws of the left and right clamp frames,
A bolt support portion for a clamp bolt in which a female screw hole penetrating in the vertical direction is disposed on the left and right center line between both clamp frames;
A front beam portion that spans between the clamp frames at a position that is in front of the bolt support portion in the protruding direction of the clamp frame;
A middle beam portion that spans between the clamp frames at a position on the rear side of the bolt support portion in the projecting direction of the clamp frame; and
The front beam part and the middle beam part are interconnected in a state of sandwiching the bolt support part from the front and rear,
A clamp type supporting leg for a round tube column, wherein the upper jaw portions of the left and right clamp frames are rigid board bodies.   2. The clamp type supporting leg for a round tube support according to claim 1, wherein the bolt support part is provided with only one female screw hole.   The corner reinforcement material which reinforces by increasing thickness to the outer surface side with respect to the corner part over the said web part and the said lower jaw part is affixed on the said clamp frame. The clamp type support leg for the round tube support according to 2.

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