JP2003040586A - Vehicle for high lift work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle for high lift work having a working platform allowing a position and a posture to be stabilized. SOLUTION: This vehicle for high lift work comprises a lower structure 1, a superstructure 2 swingably installed on the lower structure 1, a boom 3 elevatingly and telescopingly installed on the superstructure 2, and a working platform 4 installed at the tip of the boom. At least two projected members 6 having tip parts allowed to abut on a natural ground 5 around the working platform are provided on the working platform 4.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aerial work vehicle.

[0002]

2. Description of the Related Art Aerial work vehicles are often found in overhead line construction in the city. By the way, recently, some aerial work vehicles have been applied to heavy work such as bridging work at super-high places of 30 to 80 m, tower construction work and civil engineering work by modifying a mobile crane that is a construction machine. is there. In civil engineering work, for example, drilling work for improving soil quality at high places on cliffs and slopes, inflow of reinforcement material into the drilling hole (grout method), drilling for dynamite installation at high places of rock wall in quarry Examples include work and high-altitude construction work without scaffolding. Specifically, for example, the aerial work vehicle shown in FIG.
An upper revolving structure 2 rotatably provided on the lower traveling structure 1, and a boom 3 movably and extensible on the upper revolving structure 2.
And a work floor 4 provided at the tip of the boom. The main body of this example machine is a mobile crane in which a hook (not shown) originally hanging from the tip of the boom 3 is replaced with a work floor 4. That is, the work floor 4 is an attachment of a mobile crane. In addition, the working floor example of FIG.
As shown in FIG. 18, the horizontal pin 31 provided at the tip of the boom can be raised and lowered by the expansion and contraction of the expansion and contraction cylinder 32, and can be freely rotated by the rotation mechanism (not shown) about the vertical axis Po on the work floor 4. There is.

In such an aerial work vehicle, an operator rides on the work floor 4 (hereinafter referred to as "passenger"). Therefore, the work floor 4 is provided with an operation panel for the swing operation of the upper swing body 2, the hoisting operation and the extension / contraction operation of the boom 3, and the hoisting operation and the swivel operation of the work floor 4, which the passenger operates.
The operation panel is designed so that an operator cannot perform traveling operation of the lower traveling body 1 and extension operation of an outrigger (not shown). Furthermore, work equipment (not shown) such as a small crane, a boring machine, a hydraulic excavator (so-called "small hydraulic excavator") is mounted on the work floor 4,
The passenger operates these.

[0004]

By the way, according to the aerial work vehicle described above, (a) at an extremely high altitude of 30 to 80 m, the sway of the work floor due to the wind and the twisting of the boom cause a passenger to feel uneasy at a high altitude. feel it. (B) When a heavy object such as a boring machine or a hydraulic excavator is mounted, the passenger feels uneasy at a higher altitude as the altitude becomes higher. (C) In drilling work and excavation work, the rotational force of the drilling rod of the drilling machine and the drilling force of the hydraulic drilling machine cause changes in the reaction force on the work floor. The shaking of the work floor and the twisting of the boom caused by the change make the passenger feel anxiety about the height. (D) The vibration generated by the boring machine rocks the working floor, but this bouncing makes it difficult to define the pilot hole, for example, and causes bending of the boring rod, which significantly reduces the boring efficiency.

Therefore, for example, in the case of civil engineering work, the working floor is pressed against the ground slope, while in the bridge construction and the tower erection construction, the working floor is pressed against the existing bridge members and steel tower members to prevent shaking of the work floor and twisting of the boom. It may reduce passengers' anxiety about heights. However, in this case, (e1) On the ground slope, the work floor directly receives rock fall and soil fall from the slope. Furthermore, in rainy weather, water, muddy water, and mud flows that fall along the slopes directly flow into the work floor, which in turn pollutes the equipment onboard and also causes the passenger to slip and fall on the work floor. . Especially on rock slopes, since the work floor is a hardware, in order to secure the frictional force as a measure to prevent skidding, that is, to prevent the work floor from rolling,
A large pressing force (which is the "drag") is required, which results in a large bending stress on the boom. Moreover, on this rock slope, the pressing point on the work floor is not constant due to the unevenness of the surface of the slope, the work floor is twisted, and a large twist stress is generated in the boom. This is not preferable for maintaining the rigidity of the boom or the like, even though it eliminates the occupant's anxiety about high places. (E2) In the existing bridging members and existing steel tower members, most of the existing members are provisional members, even if they are existing members. Since this is a tentative decision, there is a possibility that the accuracy of the bridge and steel tower after completion will be slightly affected by the pressing force of the pressed work floor and the force of the work floor shaking due to wind and the like.

In view of the above-mentioned inconvenience, the present invention aims at providing an aerial work vehicle capable of suppressing or eliminating at least one of them.

[0007]

In order to achieve the above object, a work vehicle for high places according to the present invention is, firstly, an undercarriage and an upper part which is rotatably provided on the undercarriage. In an aerial work vehicle having a revolving structure, a boom provided on the upper revolving structure so as to be capable of undulating and expanding and contracting, and a work floor provided at the boom tip, the tip can be brought into contact with the ground around the work floor. At least two protruding members are provided on the work floor. With this configuration, the tip end portion of the projecting member abuts on the natural ground, and the position and posture of the work floor are stabilized. Therefore, regardless of the height of the high place and the weight of the mounted device, the passenger is unlikely to feel anxiety about the high place. Further, since the two projecting members are provided on the work floor, it is possible to suppress the plane swing of the work floor and the twist of the boom. If three or more projecting members are provided, it is possible to suppress three-dimensional shaking of the work floor and twisting of the boom. Furthermore, the fact that the tip of the protruding member abuts against the natural ground means that it abuts against any natural ground.
There is a gap between the work floor and the ground. In other words, most of the stones, soil, water, muddy water, mud, mud, etc. falling along the ground slope pass through these gaps and fall below the work floor. It is possible to prevent damage and pollution of the onboard equipment, and to prevent passengers from slipping and falling.

Secondly, the lower traveling body, the upper revolving body rotatably provided on the lower traveling body, the boom provided on the upper revolving body so as to be up and down and extendable, and the boom tip end are provided. In an aerial work vehicle having a work floor, a swivel member is provided around the joint between the boom and the work floor so that the swivel member can swivel around the center of the joint, and the tip can be brought into contact with the ground around the work floor. At least two protruding members may be provided on the swiveling member. With this configuration, the swiveling member swivels around the center of the joint regardless of the work floor, so that the pressing force of the projecting member is all effective pressing force and waste is eliminated. If the work floor is a swivel type as shown in FIG. 18, it is possible to freely swivel the work floor while pressing the projecting member against the natural ground (this is not possible with the first configuration).

In the above first or second work vehicle for aerial work, it is desirable that the projecting member thereof be extendable. In this way, the size of the gap can be managed freely. Also,
Even if the ground is uneven, the tip of the projecting member can be expanded and contracted to abut the unevenness without changing the position and / or posture of the work floor.

Further, in the above-mentioned first, second or third work vehicle for aerial work, it is preferable that the tip end portion of the projecting member is formed so as to be capable of penetrating into the natural ground or is constituted by an elastic member. It is preferable that only the tip portions are alternately replaceable, or one of them is integrally fixed and the other is removable. In this way, in the case where the natural ground is a soft material, it is possible to use the tip portion that is formed so that it can penetrate. On the other hand, in the case where the natural ground is a hard material such as rocks, bridge members and steel tower members, it is composed of an elastic member. The tip can be used. The tip of the elastic member can prevent and dampen the vibration and shaking of the work floor, and its frictional force can also suppress and dampen the shaking of the work floor in the vertical and horizontal directions. That is, the twisting of the boom can be suppressed and damped.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of an aerial work vehicle according to the present invention will be described below with reference to FIGS. The main body of each embodiment is the same as that described in FIGS.
It is an aerial work vehicle. Therefore, in the following description, FIG.
The elements and their reference numerals not shown in FIG. 16 are the elements and their reference numerals already described in FIGS. 17 and 18.

In the first embodiment, as shown in FIGS. 1 to 3, the work floor 4 is provided with a projecting member 6 whose tip can be brought into contact with the ground 5 around it. Unless otherwise specified, the ground 5 includes existing bridge members, existing steel tower members, and the like (not shown) (the same shall apply to the "claims"). Here, the tip portion 6a of the protruding member 6 in FIG. 1 is formed in a pointed wedge shape. On the other hand, the tip portion 6b of the projecting member 6 in FIG. 2 is formed of an elastic member made of resin such as rubber. Then, as illustrated by the tip portion 6b of FIG.
One is provided. Further, similarly, as shown in FIG. 3, each protruding member 6 is expandable and contractible (they may be of a "fixed length type" instead of the "extendable type"). The tip 6b of FIG. 3 may be replaced with the tip 6a of FIG. Therefore, hereinafter, when the tip 6b and the tip 6a are not distinguished, they are simply referred to as "tips".

The operation and effect of each projecting member 6 will be described below. (1) The tip of the projecting member 6 abuts against the natural ground 5. Therefore, the position and posture of the work floor 4 will be maintained even if there is wind or vibration or operation of the drilling machine, hydraulic excavator, etc. installed. Stabilize. Specifically, the boring machine rotates the boring rod,
Since the tip of the projecting member 6 is in contact with the ground 5, the projecting member 6 resists the rotational force of the drilling rod and prevents the work floor 4 from shaking. Therefore, for example, the pilot hole is determined, and the bending of the drilled rod can be prevented. Therefore, regardless of the height of the high place and the weight of the mounting device, the passenger is unlikely to feel the anxiety of the high place.

(2) Two projecting members 6 are provided on the work floor 4. Therefore, the work floor 4 establishes three-point support between the respective tip portions of both projecting members 6, and therefore, basically, Has
It is possible to suppress the planar swing of the work floor 4 and the twist of the boom 3. As described above, since the tip end of the projecting member 6 abuts on the ground 5 (actually abuts with abutting force), the three-dimensional rocking of the work floor 4 and the twisting of the boom 3 are also suppressed.
Of course, three projecting members 6 may be provided, and in this case, the tip of one projecting member 6 is displaced from the plane formed by the tip of the other two projecting members 6 and the work floor 4. It is desirable to provide so as to contact the natural ground 5 at a position. In this way, three-dimensional shaking of the work floor 4 and twisting of the boom 3 can be suppressed (the same applies to four or more).

(3) The fact that the tip of the projecting member 6 abuts against the ground 5 means that it abuts against any ground 5. Therefore, as shown in the drawing, a gap δ is created between the work floor 4 and the ground 5. That is, since the work floor 4 faces the ground 5 with a gap δ, most of the stones, soil, water, muddy water, mud, mud, etc. falling along the ground slope pass through this gap δ. It falls below the work floor 4. Therefore, it is possible to prevent the work floor 4 from being damaged and polluted by the equipment mounted on the work floor 4, and also prevent the passenger from slipping and falling.

(4) The projecting member 6 can be expanded and contracted. Therefore, the size of the gap δ can be controlled freely. Further, even if the ground 5 is uneven, the projecting member 6 can be expanded and contracted to abut the unevenness without changing the position and / or the posture of the work floor 4.

(5) The tip portion 6a of the projecting member 6 shown in FIG. 1 is shaped like a wedge. Therefore, if the ground 5 is soil,
The projecting member 6 preferably penetrates the natural ground 5. The penetration is 5
The work floor 4 is restrained by the wind, and the work floor 4 can be restrained from being shaken by the wind, and by the vibration of the drilling machine and the hydraulic excavator and the work reaction force. As a result, passengers are less likely to feel anxiety about high places. The tip 6a may have any shape and / or material as long as it is formed so as to be capable of penetrating after coming into contact with the soft ground 5 such as soil. Although not shown, a collar may be provided on the rear side of the tip portion 6a of the projecting member 6 in order to absolutely secure the gap δ between the work floor 4 and the ground 5. In this way, the amount of penetration is limited, but a gap is secured. Further, in this case, the contact surface of the brim with the natural ground 5 can better limit the swing of the work floor 4 in the vertical and horizontal directions.

(6) The tip 6b of the protruding member 6 shown in FIG. 2 is made of an elastic member. For that purpose, the ground 5 is bedrock,
If it is an existing bridge member or existing tower member, etc., the tip portion 6b
Abut these surfaces. In this way, the tip 6
The elastic member 6b, which is b, damps the shaking of the working floor 4 due to the wind, and the shaking of the working floor 4 due to the vibration and operation of the hole drilling machine and the hydraulic excavator. Therefore, the twist of the boom is not increased and is damped. Also,
Since the elastic member is not made of metal but made of resin such as rubber, a large sliding resistance can be expected at the contact surface of rock, existing bridge members, or existing steel tower members. Of the work floor 4 (that is, shaking of the work floor 4 in the vertical and horizontal directions) and the twisting of the boom 4 can be suppressed. Therefore, for example, in the drilling operation, the pilot hole can be easily determined, and the drilling rod is hard to bend. As a result, the drilling efficiency is remarkably improved.

Next, various expansion / contraction mechanisms of the projecting member 6 will be exemplified.

The protruding member 6 shown in FIG. 4 has a rear portion as a male screw portion 61a. On the other hand, the work floor 4 has a male screw portion 61a.
The female screw part 61b screwed together is provided. Then, when the passenger reverses the protruding member 6 in the forward and reverse directions, the male screw portion 61a advances and retreats in the female screw portion 61b, so that the protruding member 6 expands and contracts.

The protruding member 6 shown in FIG. 5 is provided with a plurality of pin holes 62a in the longitudinal direction at the rear portion thereof at a small pitch in the longitudinal direction. On the other hand, the work floor 4 includes a boss portion 62b that penetrates the rear portion of the projecting member 6. The boss portion 62b is provided with a pair of pin holes 62c and 62c at its opposing portion. Therefore, when the passenger moves the projecting member 6 back and forth so that the desired pin hole 62a matches the pin holes 62c, 62c, and when they match,
When the pin 62d is inserted between the pin holes 62c, 62a and 62c, the protruding member 6 is fixed. That is, the protrusion member 6 expands and contracts by changing the amount of protrusion from the inside of the boss portion 62b.

The protruding member 6 of FIG. 6 has a pin connecting portion 63a at the center of its rear end surface. On the other hand, the work floor 4 includes a boss portion 63b into which the rear portion of the projecting member 6 is inserted. The boss portion 63b has a cylinder tube of the telescopic cylinder 63c fixed to the rear end thereof, and the tip of the cylinder rod is pin-connected to the pin connecting portion 63a. The extension / contraction cylinder 63c may be a hydraulic type or a pneumatic type, and when the occupant expands / contracts the expansion / contraction cylinder 63c, the protrusion member 6 expands / contracts by changing the protrusion amount from the boss portion 63b.

The protruding member 6 shown in FIG. 7 is provided with a long groove 64a on the side surface of the rear end thereof. On the other hand, the work floor 4 includes a boss portion 64b into which the rear side of the protruding member 6 is inserted. Boss 64
b has an adjusting screw 64c at its rear end. Screw 64c
The front end of the contact member abuts on the rear end surface of the protruding member 6. Also,
The boss portion 64b is provided with a stopper screw 64d on its side surface. The tip of the screw 64d enters the long groove 64a of the protruding member 6. Note that the nuts 64e and 64f shown in the drawing are screw 6
It is for fixing 4c and 64d to the boss portion 64b. When the passenger moves the adjusting screw 64c back and forth, the protruding member 6
Expands and contracts by changing the amount of protrusion from inside the boss portion 64b. still,
The stopper screw 64d prevents the protruding member 6 from falling out.

Although the tip end portion of each protruding member 6 with the expansion / contraction mechanism shown in FIGS. 4 to 7 is shown as the elastic member 6b, it may be formed into the wedge shape 6a shown in FIG. Further, as shown in FIG. 8, an engaging portion (screw portion in this example) is provided on the tip end side of the projecting member 6 so that the tip end portion 6b which is an elastic member and the tip end portion 6a formed in a wedge shape can be exchanged. Tip exchange type "
May be Furthermore, a “tip portion selection type”, which will be described later in detail with reference to FIGS. 9 and 11, may be adopted. The tip exchangeable type and the tip selectable type are not limited to the telescopic type projecting member, and can also be applied to the tip part of the constant length type projecting member.

Next, the above-mentioned tip-end selection type protruding member will be exemplified. This is illustrated in Figures 9 and 11 as described above. Details are as follows.

The main body of the projecting member 6 in FIG. 9 is provided with a tip portion 6b which is an elastic member. However, a male screw portion is provided on the outer periphery just behind the tip portion 6b, and the tip portion 6b is covered. The wedge-shaped tip portion 6a is screwed together. Of course, a female screw is provided on the inner peripheral surface of the rear end of the tip portion 6a.
That is, FIG. 9 shows the use of the tip 6a, while FIG. 10 shows the use of the tip 6b with the tip 6a removed. That is, the protruding member 6 is a tip-end selectable member. In this example, the collar 6c is screwed to the male screw portion exposed when the tip portion 6b of FIG. 10 is used. This prevents external damage to the male screw portion. When the tip portion 6b is used, since the tip portion 6b only abuts on rock or the like, there is little chance of directly damaging the male screw portion, but avoiding damage to the male screw portion due to falling rocks. This is the purpose of installing the collar 6c. Reference numeral 6d is a locking hole of a hand instrument (a hook spanner) for screwing and removing the tip portion 6a and the collar 6c. Of course, instead of screwing, for example, a pin connecting method based on the pin inserting / extracting method illustrated in FIG. 5 may be used. If the pin connection method is adopted, the passenger does not have to pay attention to the protection against the damage to the male screw, so that the painful work can be reduced.

The protruding member 6 shown in FIG. 11 is of the opposite type to the protruding member 6 shown in FIG. That is, the protruding member 6 of FIG.
The main body of (1) has a tip portion 6a formed in a wedge shape. However, a male screw portion is provided on the outer periphery just behind the tip portion 6a, and a tip portion 6b which is an elastic member is screwed so as to cover the tip portion 6a. It is a combination. Of course, a female screw is provided on the inner peripheral surface of the rear end of the tip portion 6b. That is, FIG. 11 shows the use of the tip 6b, while FIG. 12 shows the use of the tip 6a with the tip 6b removed. That is, the protruding member 6 is a tip-end selectable member. Note that in this example as well, FIG.
The collar 6c is attached to the external thread exposed when the tip 6a of the
Are screwed together. This prevents external damage to the male screw portion. When the tip portion 6a is used, the male screw portion is also penetrated into the soil, and the male screw portion is worn and / or damaged. The purpose of avoiding this is to install the collar 6c. Reference numeral 6d is a locking hole of a hand tool (a hook spanner) for screwing the tip portion 6b and the collar 6c.
Of course, instead of screwing, this may also be a pin connection system by a pin withdrawal system. In this way, similarly to the above, the passenger does not have to pay attention to protection against damage to the male screw, etc., and the painful work can be reduced.

The protruding member 6 of each type shown in FIGS. 9 and 11 is used.
In the above description, the term "tip selection type" is used, but each type has the following two meanings. The first is whether or not the tip 6a or tip 6b is simply used in the form of FIG. 9 or the form of FIG. Secondly, it is preferable to use the type itself shown in Fig. 9 for the example machine with a lot of work against bedrock in terms of work efficiency due to the frequency of tip exchange and the size relationship between the tips. 1
From the fact that the adoption of the type 1 itself is preferable in terms of work efficiency, it means whether or not to select one of the types of FIGS. 9 and 11 according to the ground-to-ground condition.

The first embodiment described above is an example in which the projecting member 6 is provided on the work floor 4, but the second embodiment shown in FIG.
A swivel member 7 which is swivelable around the joint between the boom 3 and the work floor 4 is provided around the joint center, and two projecting members 6 are provided on the swivel member 7. Details are as follows.

FIG. 14 is a ZZ view of FIG. The revolving member 7 is a bifurcated member in which the inner ring of the bearing 71 is externally fitted and fixed on the outer periphery of the work floor 4 on the side where the revolving mechanism is on the side of the bobbin 3 and is cantilevered by the outer ring. Therefore, the swiveling member 7 is provided on the work floor 4
Regardless of the turning of the vehicle, the vehicle freely turns around the vertical axis Po on the work floor 4. That is, the work floor 4 and the upper swing body 2
It is not the control swing using each motor in
The unrestricted turning supported by b is performed.

Guide cylinders 72 for guiding the projecting movement of the projecting member 6 are fixedly provided on the respective legs of the swiveling member 7 at their respective tip portions. A telescopic cylinder 73 is provided behind both guide cylinders 72.
Has been placed. The expansion / contraction cylinder 73 is a hydraulic cylinder, but the expansion / contraction amount thereof is freely controlled by the operation of the passenger.

The operation and effect of the second embodiment will be described with reference to FIGS. FIG. 15 shows the effect of the second embodiment, and FIG. 16 shows the effect of the first embodiment for comparison. Therefore, in FIG. 15 and FIG. 16, in order to make the comparison conditions the same, the relative angles of the boom 3 to the work floor 4 are made the same, and the work floor 4 is made the same.
The relative angles with respect to the natural ground 5 are also the same, and the tip end portion 6b of the protruding member 6 is brought into contact with the natural ground 6.
Note that the projecting member 6 has a hydraulic pressure after the occupant determines a predetermined position and posture of the work floor 4 by turning the upper swing body 2, raising and retracting the boom 3, and turning and raising and lowering the work floor 4. The cylinder 73 is extended and the tip of the protruding member 6 is pressed against the natural ground 5. The pressing is completed in a state where the pressing force of both projecting members 6 against the natural ground 5 is substantially the same. The pressing force may be grasped by hydraulic pressure, or the occupant may empirically determine the "projection length" which is an alternative value. After this pressing is completed, the passenger works on the natural ground 5 by using the work implement mounted on the work floor 4. In the following description, "pressing force" is referred to as "actual pressing force F1,
It is divided into “F2” and “effective pressing force Fo”. The effective pressing force Fo is a force acting in a direction perpendicular to the ground slope S (this reaction force is a so-called "reaction force"). Further, the “slope S” is a line connecting between the contact points of the tip ends of the projecting members 6 with the ground 5, as shown in FIGS. 15 and 16.

That is, according to the second embodiment, as shown in FIG. 15, since the swivel member 7 freely swivels around the vertical axis Po via the bearing 71, the actual pressing force F1 of the projecting member 6 is applied to the slope S. In contrast, it occurs on the vertical action line S1, and this action line S1 passes through the vertical axis Po. That is, the actual pressing force F1 becomes the effective pressing force Fo as it is and is generated not on the point P1 in the drawing but on the vertical axis Po, and there is no waste (F1 = Fo). Further, since the occupant can freely control the turning of the work floor 4 while pressing both the protruding members 6 against the natural ground 5, the work efficiency is improved.

On the other hand, in FIG. 16 showing the first embodiment,
Since the work floor 4 is integrated with the boom 3 to form a kind of rigid body, the actual pressing force F2 of the projecting member 6 is generated on the illustrated action line S2, and its action point is the vertical axis Po as in the second embodiment. Instead, it occurs at the point P2 shown on the action line S2. Further, in this case, the actual pressing force F2 can be decomposed into a component force F21 parallel to the slope S and a component force F22 perpendicular to the slope S,
The vertical component force F22 becomes the effective pressing force Fo (F22 =
Fo). Here, since "F2>F22","F2>
Fo ”. That is, according to the second embodiment of “F1 = Fo”, as compared with the first embodiment of “F2> Fo”,
A small actual pressing force (F1 <F2) will suffice, and the reaction load on the boom 3 can be reduced accordingly. In addition, as a matter of course, in the first embodiment, as in the second embodiment, the occupant does not need to press the both protruding members 6 against the natural ground 5 while the passenger is working on the work floor
There is also no advantage that the swivel control can be performed freely.

For reference, let us look at the comparison between the first and second embodiments in terms of moment. During the work, as described several times, the pressing force changes due to the wind force, the vibration of the work implement and the work force, and this change causes the cantilever load on the boom 3 to increase or decrease. It is assumed that, in FIGS. 15 and 16, “the return swing and twist of the boom 3” have occurred based on the change. This is the "return force F3" shown.
Based on. Here, the arm length L1 of the first embodiment shown in FIG. 16 is shorter than the arm length L2 of the second embodiment shown in FIG. 15 by ΔL (= L2-L1). Therefore, the first
The embodiment requires a smaller moment than the second embodiment. That is, when the same returning force F3 is applied, the moment in the first embodiment is larger than that in the second embodiment, and the cantilever load on the boom 3 is correspondingly larger. In other words, the second embodiment has a smaller moment than the first embodiment, and the cantilever load on the boom 3 is correspondingly smaller.

In each of the above-mentioned embodiments, an example machine in which the work floor 4 is provided at the tip of the boom has been described, but the work floor 4 may be detachably attached to the tip of the jib projecting from the boom tip. Almost the same operational effects as those of the respective embodiments can be obtained. Therefore, in the present invention, the boom and the jib are not distinguished from each other, and the jib is included in the boom (the same is applied to the "claims").

Further, in each of the above-mentioned embodiments, the work floor 4 is capable of controlling the hoisting and turning around the tip of the boom 3, but it is possible to control the hoisting control and / or the turning control. It can also be applied to work vehicles.

[Brief description of drawings]

FIG. 1 is a partial side view of a work floor including a wedge-shaped protruding member according to a first embodiment.

FIG. 2 is a partial side view of a work floor including a projecting member with an elastic member according to the first embodiment.

FIG. 3 is a plan view of FIG.

FIG. 4 is a partial cross-sectional plan view of a protrusion member that is a first example of the protrusion member with a telescopic mechanism.

FIG. 5 is a partial cross-sectional plan view of a protrusion member that is a second example of the protrusion member with a telescopic mechanism.

FIG. 6 is a partial cross-sectional plan view of a protrusion member that is a third example of the protrusion member with a telescopic mechanism.

FIG. 7 is a partial cross-sectional plan view of a protrusion member that is a fourth example of the protrusion member with a telescopic mechanism.

FIG. 8 is an explanatory diagram of a protruding member with a replaceable tip portion.

FIG. 9 is an explanatory diagram of an example of a tip-end selectable protruding member.

FIG. 10 is a view with the wedge-shaped tip end portion of FIG. 9 removed.

FIG. 11 is an explanatory diagram of another example of the tip-end selectable protruding member.

FIG. 12 is a view in which the tip end portion with the elastic member of FIG. 11 is removed.

FIG. 13 is a side view of the second embodiment.

FIG. 14 is a ZZ view of FIG. 13.

FIG. 15 is a diagram showing a function and effect of the second embodiment.

FIG. 16 is a diagram showing a function and effect of the first embodiment.

FIG. 17 is a side view of a conventional aerial work vehicle.

FIG. 18 is an enlarged view of part X in FIG.

[Explanation of symbols]

1: Lower traveling body, 2: Upper swing body, 3: Boom, 4: Work floor, 5: Ground (including existing members), 6: Projecting member, 6
a, 6b: tip part, 7: turning member, Po: center of joint part.

Claims (7)

[Claims] 1. A lower traveling body (1), an upper revolving body (2) rotatably provided on the lower traveling body (1), and an undulating and extendable structure provided on the upper revolving body (2). In an aerial work vehicle having a boom (3) and a work floor (4) provided at the tip of the boom, a projecting member (6) capable of abutting the tip portion on the ground (5) around the work floor is provided. At least two aerial work vehicles provided on the work floor (4). 2. A lower traveling body (1), an upper revolving body (2) provided on the lower traveling body (1) so as to be rotatable, and an undulating and extendable structure provided on the upper revolving body (2). In an aerial work vehicle having a boom (3) and a work floor (4) provided at the boom tip, turn around the joint center (Po) around the joint between the boom (3) and the work floor (4) In addition to providing a free swivel member (7), at least two projecting members (6) whose tip can be brought into contact with the natural ground (5) around the work floor are provided in the swivel member (7). A featured aerial work vehicle. 3. The aerial work vehicle according to claim 1, wherein the projecting member (6) is expandable and contractible. 4. The tip portion of the protruding member (6) is formed so as to be capable of penetrating the natural ground (5).
The aerial work vehicle described in 2 or 3. 5. The tip portion of the projecting member (6) is made of an elastic member.
The aerial work vehicle described. 6. The projecting member (6) alternates between a first tip portion (6a) formed so as to be capable of penetrating the natural ground (5) and a second tip portion (6b) formed of an elastic member. The aerial work vehicle according to claim 1, 2 or 3, wherein the aerial work vehicle is replaceable. 7. The protruding member (6) is either a first tip portion (6a) formed so as to be capable of penetrating the natural ground (5) or a second tip portion (6b) formed of an elastic member. One of them is integrally fixed,
The aerial work vehicle according to claim 1, 2 or 3, wherein the other is detachable.