JP6470623B2 - Protective prop - Google Patents

Description

  The present invention relates to a protective strut that can be suitably used for a parent rope strut or the like 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.
A conventional master rope support has been proposed and patented as a clamp-type support leg in order to increase the support strength (see Patent Documents 1 and 2). In addition, it has been proposed to increase the reinforcing force against breakage by making the support column itself a multi-layered tube in accordance with such a clamp-type support leg.

Japanese Patent No. 3881649 Japanese Patent No. 5314994

In the conventional master rope support, the clamp-type support legs are recognized at construction sites and the like as satisfying strong support strength, and are highly evaluated in the market. Also, a structure in which the support itself is reinforced with a multilayer pipe can reliably prevent the support from being broken, and this is also highly evaluated.
By the way, the present inventor conducted an experiment for examining the resistance to breakage by assuming a load that is expected to be generated at an actual site and generating an excessive load on the column. In this experiment, it was confirmed that there was a case where breakage occurred at a stretch without any noticeable notice when the column broke. Although the load conditions employed in this experiment assume an overload that is unlikely to occur in the actual field, there is still concern about overlooking the situation as the occurrence of breakage. This is because in the unlikely event that a breakage actually occurs, it can no longer serve as a master rope support (protective measure) at that time.

  The present invention has been made in view of the above circumstances, and in a protective column that can be suitably used with a master rope column or the like, the occurrence of breakage is thoroughly prevented, and in the unlikely event that the allowable load is exceeded. It is an object of the present invention to provide a protective support column capable of exhibiting a necessary protective action without causing breakage even when an overload occurs.

In order to achieve the above object, the present invention has taken the following measures.
That is, the protective support column according to the present invention includes an exterior pipe that forms the exterior of the support column and a reinforcement structure that is built in the exterior pipe, and the reinforcement structure is fitted in a nested manner. A plurality of metal reinforcing pipes that form at least a double pipe wall, and an adhesive layer made of soft metal is formed in a circumferential gap between the fittings of the plurality of reinforcing pipes. It is characterized by.

It is preferable that one end portion of one of the reinforcing pipes is coupled to another reinforcing pipe so that the shaft cannot be moved.
It is preferable that the plurality of reinforcing pipes are formed so that the pipe length is gradually reduced as they are arranged from the outer side to the inner side in the fitting relationship.
It is preferable that the adhesive layer is formed by infiltrating and solidifying the treatment liquid eluted from the soft metal between the fittings of the plurality of reinforcing pipes.

  According to the present invention, in the protective strut that can be suitably used with the master rope strut or the like, the occurrence of breakage is thoroughly prevented, and by any chance an overload that exceeds the allowable load occurs. However, the necessary protective action can be achieved without breaking.

It is the side view which showed the master rope support | pillar comprised by attaching a clamp type support leg to the lower end part of the protection support | pillar which concerns on this invention. It is the side view which decomposed | disassembled and showed the master rope support | pillar. It is a sectional side view of a master rope support | pillar. It is the sectional side view which showed the reinforcement structure equipped in the protection support | pillar which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 to FIG. 3 show a master rope support 3 constructed by attaching a clamp-type support leg 2 to the lower end of a protective support 1 according to the present invention. As shown in FIG. 1, the protective support column 1 according to the present invention has a configuration in which a reinforcing structure 5 is provided on an exterior pipe 6 that forms a support exterior.
It is important that the exterior pipe 6 is a hollow tube in order to allow the reinforcement structure 5 to be fitted. Further, the reinforcing structure 5 has a cross-sectional shape that matches the hollow cross section of the outer pipe 6 so that the reinforcing structure 5 does not rattle when the reinforcing structure 5 is fitted into the outer pipe 6. It is good to do. Specifically, the outer pipe 6 is preferably a round tube, and therefore the reinforcing structure 5 is also preferably a round tube.

  FIG. 4 shows the reinforcing structure 5. The reinforcing structure 5 has a plurality of (two in the illustrated example) metal reinforcing pipes 10 and 11 having different thicknesses and lengths, and the reinforcing pipes 10 and 11 are nested in each other. It is formed by fitting. Needless to say, the reinforcing pipe 10 arranged outside the fitting relationship is formed thick, and the reinforcing pipe 11 arranged inside the fitting relationship is formed thin. Further, the reinforcing pipe 10 disposed outside the fitting relationship is formed long, and the reinforcing pipe 11 disposed inside the fitting relationship is formed short.

The thick and long reinforcing pipe 10 and the thin and short reinforcing pipe 11 are arranged so that their lower ends match. Therefore, a stepwise difference occurs in the arrangement of the upper ends of the reinforcing pipes 10 and 11.
Note that the lower ends of the reinforcing pipes 10 and 11 are not necessarily matched with each other, and can be arranged close to each other (for example, only the lower end of the thick and long reinforcing pipe 10 is provided). Alternatively, the lower end of the reinforcing pipe 11 that is thin and short may be protruded downward. The two reinforcing pipes 10 and 11 fitted in such an arrangement relationship are in a state in which their lower ends are coupled to each other and do not move axially.

  The connecting means for connecting the lower ends of both the reinforcing pipes 10 and 11 is welded to the annular portion (the portion appearing as a double circle) at the lower end of the pipe by electric welding, gas welding or the like in the circumferential direction. (Reference numeral W in FIG. 4) is most preferable. If welding is employed in this way, the outer peripheral surface of the reinforcing pipe 10 (outer peripheral surface of the reinforcing structural body 5) which is the outer side of the fitting is not caused to protrude by the coupling means, and the reinforcing structural body is put into the outer pipe 6. This is convenient for fitting 5. Instead of welding, it is also possible to perform a coupling method by wedge driving or the like.

However, since it is possible to arrange the reinforcing structure 5 so that the lower end portion protrudes from the lower end portion of the exterior pipe 6, in this case, as a coupling means, screwing or riveting that penetrates in the pipe radial direction is possible. It is also possible to adopt. Nonetheless, considering the processing effort and cost, it is most preferable to employ welding as the coupling means.
The thick and long reinforcing pipe 10 has an outer diameter that is equal to or smaller than the inner diameter of the exterior pipe 6 and can be fitted to the exterior pipe 6 without rattling. The length of the thick and long reinforcing pipe 10 is about 60% of the total length of the exterior pipe 6.

On the other hand, the thin and short reinforcing pipe 11 is formed to have an outer diameter that is equal to or smaller than the inner diameter of the long reinforcing pipe 10 and fits into the thick and long reinforcing pipe 10 without rattling. Yes. The length of the thin and short reinforcing pipe 11 is about 20% of the total length of the exterior pipe 6.
Since the reinforcing structure 5 configured in this manner is a multiple pipe in which a thick and long reinforcing pipe 10 and a thin and short reinforcing pipe 11 are doubled, the outer peripheral portion is a double pipe wall. It is a structure surrounded by.

In the reinforcing structure 5, an adhesive layer 12 is formed between the two reinforcing pipes 10 and 11 so as to cover the entire circumferential gap. The adhesive layer 12 is made of a soft metal such as lead, tin, zinc, copper, or aluminum.
The adhesive layer 12 can be formed by plating or the like. That is, the thin and short reinforcing pipe 11 is fitted into the thick and long reinforcing pipe 10 and the lower ends of both the reinforcing pipes 10 and 11 are joined, and the soft metal is eluted from both the reinforcing pipes 10 and 11. Immerse it in the processing solution (plating solution) and apply voltage. As a result, the soft metal is infiltrated between the two reinforcing pipes 10 and 11 to be deposited or solidified, and the adhesive layer 12 is formed.

Instead of the plating process, a method of immersing both the reinforcing pipes 10 and 11 in a fitted and bonded state in a treatment tank in which a molten metal of soft metal is stored may be employed.
It is important to connect the lower ends of the two reinforcing pipes 10 and 11 as described above in that a uniform circumferential clearance is formed between the fittings of the two reinforcing pipes 10 and 11 in the circumferential direction and the tube axis direction. In addition, the lower end joint portion (annular portion at the lower end of the pipe) of both the reinforcing pipes 10 and 11 is also arranged around the entire circumference in order to make it easier for the processing liquid from the soft metal to enter between the fittings of both the reinforcing pipes 10 and 11. It can be said that it is effective not to combine them with each other, but to keep them only at a plurality of locations in the circumferential direction (to ensure a treatment liquid intrusion route).

  As shown in FIG. 1, the exterior pipe 6 forms an exterior as a master rope support 3, and therefore, at the upper end thereof, there are a plurality of locations around it at equal intervals (in the example shown, 4 at intervals of 90 °). A loop 20 for passing the master rope is provided at a location). The through ring 20 is fixed so as to straddle two swivel rings 21 and 21 that are rotatably fitted to the exterior pipe 6, and is held so as to swivel around the exterior pipe 6 together with the swivel rings 21 and 21. ing.

  Therefore, the direction in which the master rope (not shown) is stretched with respect to the protective strut 1 (exterior pipe 6) according to the present invention is not limited. The swiveling rings 21 and 21 are prevented from moving in the axial direction with respect to the exterior pipe 6 (prevented from coming off) by bolts 22 provided so as to pass through the exterior pipe 6 therebetween. Further, a carrying handle 23 may be folded and attached to the midway part in the longitudinal direction of the exterior pipe 6 so as to be foldable.

On the other hand, the clamp type support leg 2 includes a support column holding part 25 and a pair of left and right clamp frames 26 provided in a protruding state from the left and right sides of the support column holding part 25 toward the front. As shown in FIG. 3, clamp bolts 32 are screwed into the left and right clamp frames 26 with bolt support portions provided so as to cross between the upper jaw portions 31 with their axial centers directed in the vertical direction.
The support column holding portion 25 is formed of a round tube, and the lower end portion of the protective support column 1 is inserted and raised from the inside of the tube. The support holder 25 is formed with two distribution holes 27a and 27b in a state of passing through the pipe diameter in the front-rear direction. These two distribution holes 27a and 27b are provided to prevent the protective support column 1 from coming off from the support column holding part 25.

In contrast to the distribution holes 27 a and 27 b of the support holder 25, the protective support 1 has an outer through hole 28 that penetrates the lower end of the exterior pipe 6 in the radial direction, and the lower end of the reinforcing structure 5 (the reinforcing pipe 10 And an inner through hole 29 penetrating in a radial direction.
Therefore, the distribution holes 27a and 27b of the support column holding part 25 are matched with the outer through hole 28 and the inner through hole 29 of the protective support column 1 to prevent the bolts, straight pins, taper pins, wedges, etc. from coming off. By inserting the tool 30 in a skewered manner, the upright holding of the protective column 1 with respect to the column holding unit 25 is fixed.

In addition, the support | pillar holding | maintenance part 25 is made to incline backward with respect to the clamp frame 26 so that the protection support | pillar 1 may leave | separate from an attachment target body in the condition where the clamp frame 26 clamps an attachment target body from the upper and lower sides. ing. Therefore, there is an advantage that the work place formed on the upper part of the attachment object can be widely used.
As is clear from the above detailed description, in the protective support column 1 according to the present invention, a reinforcement structure 5 having a multilayer tube structure is fitted into the exterior pipe 6 that forms the exterior of the support column. An adhesive layer 12 made of soft metal is formed in a circumferential gap formed between the fitting between the exterior pipe 6 and the reinforcing structure 5.

Therefore, even when a load that causes breakage is applied to the protective support 1, the load reducing action and the suppressing effect by the adhesive layer 12 occur between the exterior pipe 6 and the reinforcing structure 5.
That is, since the reinforcement pipes 10 and 11 of the reinforcement structure 5 are both made of metal, the inner surface of the reinforcement pipe 10 that is the outer fitting side and the adhesive layer 12 are joined, and the outer surface of the reinforcement pipe 11 that is the inner fitting side. The bond with the adhesive layer 12 has a higher bond strength as it is integrated. Of course, the adhesive layer 12 itself is integrated in the layer thickness direction. Therefore, the load reducing action or suppressing action by the adhesive layer 12 may be stickiness, slipperiness (deformability) or crushability (compressibility) of the soft metal itself forming the adhesive layer 12. It can be achieved by “material properties”.

In other words, the behavior of the detachment state between the fittings of the reinforcing pipes 10 and 11 with respect to the load acting on the protective support column 1 (a delamination phenomenon with the adhesive layer 12 or a crack destructive phenomenon of the adhesive layer 12). Rather than occur, the material properties of the integrated adhesive layer 12 will work skillfully.
In addition, the circumferential gap formed between the fitting of the exterior pipe 6 and the reinforcing structure 5 is not coupled without forming the one corresponding to the adhesive layer 12, and is coupled with only the stopper 30. In this way, a part of the load is absorbed as a substantial behavior between the fitting between the exterior pipe 6 and the reinforcing structure 5, and this is also a factor for enhancing the load reducing action and the suppressing action by the reinforcing structure 5. It has become one of the. As a result, the protective strut 1 is not likely to break, but the reinforcing structure 5 includes a plurality of reinforcing pipes 10 and 11 having different lengths in a stepwise manner, Since the structure is joined at one end, it has strong resistance to bending. In other words, the occurrence of breakage can be thoroughly prevented, and even if an overload exceeding the allowable load occurs, it does not lead to breakage, and the necessary protective action (for example, It can be used to prevent high-altitude workers from falling. Therefore, it can be suitably used with the master rope support 3 or the like.

By the way, this invention is not limited to the said embodiment, It can change suitably according to embodiment.
For example, the reinforcing pipes 10 and 11 constituting the exterior pipe 6 and the reinforcing structure 5 are not limited to round tubes, and may be square tubes or the like. In this case, the support holder 25 may naturally be a square tube.

The reinforcing pipes 10 and 11 forming the reinforcing structure 5 may have two or more nested structures. Moreover, the length of each reinforcement pipe 10 and 11 is not specifically limited, For example, you may make it the same length.
The protective strut 1 according to the present invention can be used as a strut or other protective struts in addition to being used as the master rope strut 3.

DESCRIPTION OF SYMBOLS 1 Protective support | pillar 2 Clamp-type support leg 3 Parent rope support | pillar 5 Reinforcement structure 6 Exterior pipe 5 Swivel ring 10 Reinforcement pipe 11 Reinforcement pipe 12 Adhesive layer 20 Through ring 21 Swivel ring 22 Bolt 23 Handle 25 Prop holding part 26 Clamp frame 27a, 27b Distribution hole 28 Through hole 29 Through hole 30 Retaining tool 31 Upper jaw 32 Clamp bolt

Claims (4)

An exterior pipe that forms a strut exterior;
And a reinforcing structure that is installed in the exterior pipe,
The reinforcing structure has a plurality of metal reinforcing pipes nested in each other to form at least a double pipe wall;
A protective strut, wherein an adhesive layer made of soft metal is formed in a circumferential gap between fittings of the plurality of reinforcing pipes.   The protective strut according to claim 1, wherein one end portion of one of the reinforcing pipes is coupled to another reinforcing pipe so that the shaft cannot be moved.   The protective strut according to claim 1 or 2, wherein the plurality of reinforcing pipes are formed so that the pipe length is gradually reduced as they are arranged from the outside to the inside of the fitting relationship. .   4. The adhesive layer according to claim 1, wherein the adhesive layer is obtained by infiltrating and solidifying the treatment liquid eluted from the soft metal between the fittings of the plurality of reinforcing pipes. 5. The protective strut as described.