JP2593055B2 - Safety device for crane boom assembly and dismantling work - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane boom assembling and dismantling work safety device used for assembling and dismantling crane booms.

[0002]

2. Description of the Related Art Conventionally, a crane boom has a frame structure composed of a main pipe and a plurality of lattices spanned between the main pipes. Generally, a boom of a crawler crane or a 160-ton class truck crane is used. ,
It has a structure that can be dismantled into a top boom, heavy boom, bottom boom, etc.
The main body is landed on a work site by a trailer, and a boom that has been dismantled in advance is carried into the work site by a truck or the like and assembled there.

Similarly, in a truck crane, the boom is dismantled in advance, and the boom is transported to the site separately from the truck, and is assembled at the site.

[0004]

When a worker performs assembling and disassembling operations of a boom, the boom has a ground clearance of 2 feet.
m, but in accordance with the law, if the worker works in a place where the height exceeds 2 m, the operator shall set up the work floor by providing scaffolding, etc. There are regulations on safety measures, such as the need to provide a facility for attaching a safety belt when using a mobile phone.

However, in the past, there has been no effective means for securely attaching a safety belt to prevent a worker from falling down during crane boom assembling and disassembling operations, and safety measures for this point have been demanded. I was

[0006] The present invention has been devised in view of the above circumstances, and has as its object to provide a safety device for preventing a fall of an operator when assembling or disassembling a boom of a crawler crane or a truck crane. .

[0007]

According to a first aspect of the present invention, there is provided a crane boom assembling and disassembling operation safety device according to the first aspect, wherein a connecting portion of a rope for attaching a safety belt is provided on an upper end side. Between adjacent lattices of a lattice bridged between upper main pipes of a crane boom.
It is characterized by comprising a plate-shaped base member which is detachably bolted via a bolt and which is provided with an upright mounting portion for the column.

[0008] The invention according to claim 2 is based on claim 1.
In the safety device according to the third aspect, the mounting portion for the upright of the column is attached to the base member and is formed of a tubular pipe into which the column can be inserted. The tubular pipe penetrates the base member, and a stopper is provided on the outer periphery of the lower end side of the support to abut on the upper end of the tubular pipe. 3. The safety device according to item 3, wherein the support column projects from a lower end of the tubular pipe, and a pin mounting hole for mounting a retaining pin is formed at a protruding end of the support column.

According to a fifth aspect of the present invention, in the safety device according to the second aspect, a pin mounting hole for mounting a fixing pin is formed in the support and the cylindrical pipe, and the support is connected to the cylinder via the fixing pin. It is characterized in that it can be fixed to a tubular pipe.

[0010]

According to the first aspect of the present invention, in assembling and disassembling the crane boom, a U-shaped space is provided between adjacent lattices.
After tightening the base member with a bolt at a predetermined pitch width with a bolt, and then erection of a support on the erecting mounting portion, the safety device is installed on the boom.

[0011] Therefore, if a rope is hung over the connecting portion of the column of each safety device and a safety belt is attached thereto, the rope prevents the worker from falling down. Then, when the dismantling of the boom is completed, the rope is detached, the support of each safety device is detached from the base member, and the dismantled boom is carried into the work site by a truck or the like. At this time, the base member is fixed to each boom.

[0012] When assembling the boom carried into the site, the column is again erected on the erecting mounting portion of each base member, a rope is hung over the connecting portion, and a safety belt is attached to this, thereby causing a crash. The prevention will be achieved. Then, when the assembly of the boom is completed, if the rope is detached from the connecting portion and the support is removed from the base member, operation of the boom will not be hindered even if the base member is fixed to the boom.

[0013] According to the second aspect of the present invention, the column is inserted into the cylindrical pipe, whereby the column is erected on the base member. According to the third aspect of the present invention, the column is inserted into the cylindrical pipe. Then, the stopper comes into contact with the upper end of the tubular pipe to prevent the support column from dropping from the tubular pipe.

Further, in the invention according to the fourth aspect, the retaining pin attached to the distal end on the projecting side of the column projecting from the lower end of the tubular pipe prevents the column from coming off. And Claim 5
According to the invention, the fixing pin fixed to the pin mounting hole fixes the support to the tubular pipe.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an embodiment of a safety device for boom assembling and dismantling work (hereinafter referred to as "safety device") according to claims 1 to 4, wherein 1 is an upper main pipe,
As shown in FIG. 2, reference numerals 3 and 5 denote lattices, which are composed of an upper main pipe 1 and a lower main pipe 7, which are directed to two upper and lower pipes, and a plurality of lattices 3 and 5 bridged between the main pipes 1 and 7, respectively. A crane boom 9 is configured, and an angle θ between adjacent lattices 3 and 5 is usually set to about 50 ° as shown in FIG.

As shown in FIGS. 1 and 2, the safety device 11 according to the present embodiment is attached to the lattices 3 and 5 bridged between the upper main pipes 1, and is mounted above the boom 9. They are installed at predetermined intervals.

That is, in FIG. 1, reference numeral 13 denotes a base member of the safety device 11 formed of one rectangular steel plate, and the base member 13 is provided between adjacent lattices 3, 5 as shown in FIG. Four bolt holes 17 are formed along the upper main pipe 1 so that the two U bolts 15 can be used for bolting. The bolt holes 17 are formed so that the U bolt 15 can be bolted to the lattices 3 and 5 at right angles to the lattices 3 and 5.
The bolt holes 17 are provided symmetrically with respect to the center axes m and n of the lattices 3 and 5, respectively.
Are set to be larger than the outer diameters of the lattices 3 and 5 so as to appropriately cope with a case where the angle between the adjacent lattices 3 and 5 is different or a case where the outer diameters of the lattices 3 and 5 are different.
And, in the center of the base member 13, a tubular pipe 21 for erected a stanchion 19 between the lattices 3 and 5.
Are pierced and welded.

The support column 19 has an outer diameter dimension that can be inserted into the tubular pipe 21. At its upper end side, a connecting portion of a rope (unknown) 25 for attaching a safety belt 23 used by the worker M as shown in FIG. 27 is formed in a ring shape. As shown in FIG. 5, an annular stopper 29 is attached to the lower end of the column 19, and as shown in FIG.
1, when the stopper 29 is inserted into the cylindrical pipe 21
To prevent the support column 19 from falling from the tubular pipe 21.

Then, the column 19 is connected to the cylindrical pipe 21 in this manner.
The length of the column 19 is set so as to protrude from the lower end of the tubular pipe 21 when the column is inserted into the column. As shown in FIG. 6, a pin mounting hole 33 for attaching a darma pin (retaining pin) 31 is formed at the protruding end 19a. Is prevented from falling off.

In addition, in FIG. 1, reference numeral 35 denotes a well-known hook for connecting the rope 25 to the connecting portion 27;
Reference numerals 7 and 39 denote nuts and washers for fixing the U bolt 15 to the base member 13 to prevent the nut 37 from loosening.
In this embodiment, a double nut is used.

The safety device 11 according to the present embodiment is configured as described above, and prior to assembling and disassembling the boom 9,
For example, for a crawler crane of 80 ton class, 4-6m
As shown in FIG.
In the case of a 150-ton class crawler crane, 14 safety devices 11 are similarly arranged at a pitch of 4 to 6 m.
Is placed on the boom 9.

As shown in FIGS. 3 and 6, the mounting of the safety device 11 to the boom 9 is performed by first placing two U bolts 15, a nut 37, and a washer 39 between adjacent lattices 3, 5. Then, the base member 13 is bolted along the upper main pipe 1 at a pitch of 4 to 6 m. As shown in FIG. 6, the mounting is performed by disposing the base member 13 below the lattices 3 and 5 and disposing U bolts 15 on the outer periphery of the lattices 3 and 5, respectively, so that the U The screw portion 15a of the bolt 15 may be inserted, and this may be tightened with the nut 37 and the washer 39.

After the base members 13 are fixed to the boom 9 at a predetermined pitch in this manner, the cylindrical pipes 2 of each base member 13 are fixed.
When the pillars 19 are inserted into the base members 1 and the darma pins 31 are inserted into the pin mounting holes 33 at the tips 19a on the protruding sides, the pillars 19 stand on the base member 13. At this time, the stopper 29 prevents the column 19 from dropping from the tubular pipe 21, and the dharma pin 31 prevents the column 19 from coming off. Then, as shown in FIG. 1 and FIG.
If the rope 25 is hung between the safety devices 11 via the hooks 35 at the connecting portions 27 of the boom 9, the rope M is hung in the longitudinal direction of the boom 9, and the worker M attaches the safety belt 23 to the rope 25. The rope 25 can be attached
Prevents the worker M from crashing.

When the disassembly of the boom 9 is completed, the rope 25 is detached from the connecting portion 27 and each safety device 11 is disengaged.
Is pulled out from the base member 13 and the disassembled top boom, heavy boom, bottom boom, etc. are carried into the work site by a truck or the like. At this time, the base member 13 is fixed to each boom 9.

Then, in order to assemble the boom 9 carried into the site, the column 19 is inserted again into the cylindrical pipe 21 of each base member 13, and the dharma pin 31 is inserted into the pin mounting hole 33 at the tip 19a of the protruding side. Then, the support 19 is erected on the base member 13, and the rope 25 is bridged between the safety devices 11 via the hooks 35 on the connecting portion 27 of the support 19, and the worker M attaches the safety belt 23 to the rope 25. This will help prevent falls.

When the assembly of the boom 9 is completed, the rope 25 is detached from the connecting portion 27 and the column 19 is pulled out of the base member 13, so that the base member 13 is
The operation of the boom 9 is not hindered at all even if it is fixed to the boom 9.

As described above, the safety device 11 according to the present embodiment
According to this, when the worker M performs assembling and disassembling work of the boom 9, the rope 25 for securely attaching the safety belt 23 can be laid over the boom 9 along the upper main pipe 1, so that the worker M Safety measures will be implemented.

Of course, once the base member 13 of the safety device 11 is bolted to the lattices 3 and 5, when the boom 9 is assembled and dismantled, the support 19 is simply attached to each tubular pipe 21.
Since it is only necessary to attach and detach the base member, there is an advantage that the operation is simple and the workability is excellent, and even if the base member 13 is fixed to the boom 9, there is no hindrance to the operation of the boom 9.

The dharma pin 31 is not always necessary, and the dharma pin 31 may be omitted if there is no danger that the column 19 will come off from the tubular pipe 21. FIG. 7 shows an embodiment of the safety device according to the first, second and fifth aspects. In the above-mentioned embodiment, a column provided with a stopper 29 on a cylindrical pipe 21 penetrated and welded to a base member 13 is shown. The support 19 is erected and fixed to the base member 13 by inserting the darma pin 31 into the protruding end 19a of the base member 13 while the safety pipe 41 is inserted. 13 are formed on the peripheral wall of the cylindrical pipe 21 and the column 19 by pin mounting holes 45 and 47 of the fixing pin 43. The column 19 is attached to and detached from the cylindrical pipe 21 via the fixing pin 43. It is freely fixed.

Since other structures are the same as those of the above embodiment, the same components are denoted by the same reference numerals and description thereof is omitted. Thus, even in the safety device 41 according to the present embodiment, similarly to the above-described safety device 11, when the worker M performs the assembly and disassembly work of the boom 9, the rope 25 for securely attaching the safety belt 23 is provided. It can be bridged along the upper main pipe 1 on the boom 9 and, once the base member 13 of the safety device 41 is once bolted to the lattices 3 and 5, when the boom 9 is assembled and dismantled. Since it is only necessary to attach / detach the column 19 to / from each tubular pipe 21, it is possible to achieve the intended purpose as in the above embodiment.

[0031]

As described above, according to the safety device of each claim, when the worker performs the assembly and disassembly work of the crane boom, the rope for attaching the safety belt is hung along the boom. As a result, worker safety measures have been taken.

Of course, once the base member of the safety device is bolted to the lattice, the boom can be assembled and dismantled simply by attaching and detaching the columns to and from each tubular pipe. It has an advantage in that the operation of the boom is not hindered even if the base member is fixed to the boom.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of a safety device according to claims 1 to 4. FIG.

FIG. 2 is a side view of a boom in which the safety devices shown in FIG. 1 are arranged at a predetermined pitch.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a front view of a base member.

FIG. 5 is a front view of a column.

FIG. 6 is an enlarged perspective view of an upright mounting portion of a support column of the safety device.

FIG. 7 is an enlarged perspective view of an upright mounting portion of a support in one embodiment of the safety device according to the first, second, and fifth aspects.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper main pipe 3, 5 Lattice 9 Boom 11, 41 Safety device 13 Base member 15 U bolt 17 Bolt hole 19 Prop 21 Cylindrical pipe 23 Safety band 25 Rope 27 Connecting part 29 Stopper 31 Dharma pin 33 Pin mounting hole 43 Fixing pin

Claims (5)

(57) [Claims] 1. A U-bolt is detachably attached between a supporting column provided with a connecting portion of a rope for attaching a safety belt on an upper end side and an adjacent lattice of a lattice bridged between an upper main pipe of a crane boom. A crane boom assembly comprising a plate-shaped base member having bolts fastened thereto and provided with the mounting portions for the uprights of the columns.
Safety device for dismantling work. 2. The safety device for crane boom assembling and disassembling operations according to claim 1, wherein the mounting portion for the upright of the column is attached to a base member and is formed of a tubular pipe into which the column can be inserted. 3. The crane boom according to claim 2, wherein the cylindrical pipe penetrates the base member, and a stopper is provided on an outer periphery of a lower end side of the column to abut on an upper end of the cylindrical pipe. Safety device for assembly and disassembly work. 4. The crane boom assembly according to claim 3, wherein the column protrudes from a lower end of the tubular pipe, and a pin mounting hole for mounting a retaining pin is formed at a protruding end of the column. Safety device for dismantling work. 5. The support column and the tubular pipe are provided with pin mounting holes for mounting fixing pins, and the support column can be fixed to the tubular pipe via the fixing pins.
Safety device for crane boom assembly and dismantling work as described.