JP2015108257A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work machine that can lift a machine body by a jack and be equipped with a scaffold on a base of the machine body, in which the jack can also be used as an elevating device for elevating the scaffold.SOLUTION: A work machine that has, on a base 1, a plurality of jacks 4 and 4A for lifting a machine body from the ground and, on the base, can be equipped with a scaffold 6 for carrying an operator so that it can be moved up or down, in which, while at least one jack 4 of a plurality of the jacks is arranged in such a way as capable of turning upside down between an upright posture where an expansion part faces downward relative to the base 1 and an inverted posture where the expansion part faces upward, the jack 4 for lifting the machine body can also be used as an elevating device for elevating the scaffold by arranging rotation locking means 30 for keeping the jack 4 either in the upright posture or the inverted posture and allowing the scaffold 6 to be removably attached to the end of the expansion part with the jack 4 in the inverted posture.

Description

  The present invention relates to a work machine in which the airframe can be levitated from the ground with a jack and a scaffolding platform for worker boarding can be provided on the base of the airframe.

  In recent years, there is a need for a working machine that is equipped with a machine-lifting jack that lifts the machine body from the ground and that is equipped with a scaffolding platform for worker boarding on the base of the machine so that it can be raised and lowered.

  Therefore, the applicant of the present application is a Japanese Patent Application No. 2012-174077 that has both a function of levitating the airframe from the ground and a function of being able to mount a scaffolding platform for boarding an operator on the base of the airframe so as to be movable up and down. Has applied for a patent. The working machine of this existing application is for lining up an arch-shaped liner plate for constructing a tunnel-shaped lining body from a horizontal position to a vertical position, and continuously to an existing side liner plate. It is proposed as an assembling device.

  As shown in FIGS. 14 (A) to (C), the working machine of the already-filed application is used for loading and unloading the machine body (traveling carriage) 1 onto a transfer truck 9 (see FIG. 14 (C)) by itself. While having the unloading device 8, as shown in FIG. 15, it is equipped so that a scaffolding base 6 for carrying an operator can be moved up and down by a lifting device 7 on a base (chassis) 11 of an airframe (traveling carriage) 1. doing.

  The loading / unloading device 8 (see FIGS. 14A to 14C) includes four jacks 81 capable of supporting the vicinity of the four corners of the front, rear, left and right of the chassis 11, and the jacks 81 inside and outside the chassis 11. And a slide device 82 that moves in and out in the direction.

  When the machine body (traveling carriage) 1 is loaded onto the transport truck 9 by itself, the slide devices 82 are firstly moved as shown in FIG. 14B from the traveling posture of the working machine shown in FIG. Then, each (four) jacks 81 are extended to the left and right outer sides, and then the respective jacks 81 are respectively extended as shown in FIG. 14 (C) so that the loading platform 91 of the truck 9 is placed below the fuselage (traveling carriage) 1. Secure a space to enter. In this state, after the truck carrier 91 is entered into the space below the machine body 1, each jack 81 is contracted to the minimum, and each jack 81 is inserted inward by the slide device 82. Can be loaded onto the truck bed 91. In order to unload the working machine loaded on the truck bed 91 to the ground by itself, the loading / unloading device 8 may be operated in the reverse order.

  On the other hand, when the scaffold base 6 is required on the chassis 11 of this working machine, the lower surface of the scaffold base 6 may be placed and fixed on the upper end 71 of the lifting device (hydraulic cylinder) 7 as shown in FIG. . And an operator can board on the scaffolding base 6, and can raise / lower the scaffolding base 6 to a desired height position by adjusting the raising / lowering apparatus 7 expansion-contraction. In the usage example shown in FIG. 15, the worker gets on the scaffold base 6 and performs the assembly work of the liner plate R at a desired height position.

  By the way, in the working machine of the above-mentioned existing application (FIGS. 14 and 15), a body-lifting jack 81 for loading / unloading the body 1 onto / from a transport truck 9 and a lifting / lowering device 7 (hydraulic pressure) for lifting / lowering a scaffolding base. Since the cylinders are provided separately, the number of drive units used increases, the overall weight increases, and the cost increases.

  Therefore, the invention of the present application uses a jack for lifting the aircraft as a lifting device for raising and lowering the scaffolding in a working machine that can float the aircraft with a jack and can be equipped with a scaffolding on the base of the aircraft. The purpose is to get.

  The present invention has the following configuration as means for solving the above problems.

[Invention of Claim 1 of the Present Application]
The work machine according to the first aspect of the present invention is provided with a plurality of jacks for levitating the machine body from the ground on the base, and a work that can be equipped with a scaffolding platform for boarding an operator on the base so as to be movable up and down. The at least one jack of the plurality of jacks is installed upside down between an upright posture in which the expansion / contraction portion faces downward and an inverted posture in which the expansion / contraction portion faces upward with respect to the base. On the other hand, a rotation lock means is provided between the jack and an appropriate position on the base side to hold the jack in the upright position and the inverted position, and the upside down position is provided. In the posture in which the free jack is inverted, the scaffolding base can be detachably attached to the distal end portion of the expansion / contraction portion of the jack.

  The jacks for levitation of the airframe are usually installed at four places on the base, front, rear, left and right. However, the upside down jacks may be applied to at least one of the four jacks. The upside down jacks may be a pair of left and right jacks, any three jacks, or all four jacks.

  As the rotation lock means for holding the jack in the upright posture and the inverted posture, for example, a lock pin that can be locked at two positions of the upright posture and the inverted posture by a lock pin can be adopted. .

  It is to be noted that, for example, a rectangular flat plate material that is a grounding plate in an upright posture and a connecting base for a scaffolding base in an inverted posture is fixed to the distal end portion of the expansion / contraction portion of the upside down jack. Good.

  The working machine according to the first aspect of the present invention has the following functions.

  First, when each jack is extended in a posture in which each jack is in an upright position (the expansion and contraction portion is in a downward posture), after the tip (lower end) of each expansion and contraction portion is grounded, the aircraft is lifted from the ground by each jack. It can be supported in a state of being allowed to stand. Note that the upside down jack is held (locked) by the rotation lock means in the upright position.

  On the other hand, when the upside-down reversible jack is turned upside down, the expansion / contraction part of the jack faces upward, and the lower surface of the scaffolding base can be mounted (placed and fixed) on the tip (upper end) of the expansion / contraction part. . Then, the scaffolding can be raised and lowered to a desired height position by adjusting the expansion and contraction of the jack in a state in which the scaffolding is attached to the upper end portion of the jack expansion / contraction part. Note that the inverted jack is held (locked) in an inverted posture by the rotation lock means.

[Invention of claim 2 of the present application]
The invention according to claim 2 of the present application is the work machine according to claim 1, wherein the jacks are arranged at four positions on the front, rear, left and right necessary to move the machine body up to a height at which the truck bed can enter the lower surface of the machine body. In addition, each of the jacks can appear and disappear between a position where the pair of jacks facing left and right with respect to the base is within the width of the truck bed and a position across the width of the truck bed. It is characterized by being installed in.

  According to the second aspect of the present invention, all the jacks including the jack that can be turned upside down can be made to function as a self-loading / unloading device for loading and unloading the machine body on the truck bed by itself.

[Invention of claim 3 of the present application]
The invention of claim 3 of the present application is characterized in that, in the working machine of claim 1 or 2, the upside down jack is pivotally supported in the vicinity of the center of gravity of the jack in a jack most contracted state. Yes.

  In the invention of claim 3, since the center of rotation of the jack that can be turned upside down is in the vicinity of the center of gravity of the jack, the weight on each side of the jack sandwiching the center of rotation is substantially equal.

[Effect of the invention of claim 1 of the present application]
The work machine according to claim 1 of the present invention is such that a jack for levitating the machine is installed upside down, and a scaffolding base is detachably attached to the tip (upper end) of the expansion / contraction part of the jack in an inverted position. Trying to get.

  Therefore, in the working machine according to the first aspect, since the drive device for flying the aircraft and for lifting the scaffolding can be shared by one jack, the weight of the entire aircraft is reduced and the equipment cost is reduced as the drive device is reduced. There is an effect that it is possible to reduce the cost and the number of surplus spaces that can be used as effective spaces.

  In the working machine according to claim 1, since the jack can be held (locked) in the upright position and the inverted position by the rotation lock means, even if the jack is turned upside down. There is an effect that the jack can be locked in each use posture (safety can be ensured).

[Effect of the invention of claim 2 of the present application]
The invention of claim 2 of the present application is the work machine of claim 1, wherein each jack has a function capable of loading and unloading the machine body with respect to the truck bed by itself.

  Therefore, in addition to the effect of claim 1, the working machine of claim 2 has an effect that it is not necessary to prepare another loading / unloading device (for example, another crane) during transportation of the machine body.

[Effect of the invention of claim 3 of the present application]
According to the invention of claim 3 of the present application, in the working machine of claim 1 or 2, the upside down jack is pivotally supported near the center of gravity of the jack.

  Therefore, in the working machine according to claim 3, since the weights on the respective sides sandwiching the center of rotation of the jack are substantially equal, in addition to the effect of the first or second aspect, the upside down operation of the jack is performed with a light operating force. There is an effect that can be done.

It is a side view of the working machine of an Example of this application. It is a top view of the working machine of FIG. It is a left view of the working machine of FIG. It is IV-IV expanded sectional drawing of FIG. It is explanatory drawing at the time of using the jack of the working machine of FIG. 1 for body loading / unloading. It is explanatory drawing at the time of using the jack of the working machine of FIG. 1 for scaffolding raising / lowering. It is a top view in the state of FIG. It is VIII-VIII expanded sectional drawing of FIG. It is IX-IX expanded sectional drawing of FIG. It is explanatory drawing in the planar state at the time of using the working machine of FIG. 1 for the liner plate assembly | attachment in a tunnel. FIG. 11 is an explanatory view when the liner plate is raised and operated in a side view equivalent view of FIG. 10. It is explanatory drawing of the scaffold base usage method in the standing state of the liner plate in the usage example of FIG. 10, Comprising: It is explanatory drawing in case a liner plate is small size. It is explanatory drawing in case the liner plate in FIG. 12 is large size. It is explanatory drawing at the time of loading / unloading the working machine of the applicant's already filed application (unpublished) on a conveyance truck by itself. It is explanatory drawing in the case of using a scaffolding base in the working machine concerning the already-applied application (unpublished) of this applicant.

[Example]
Hereinafter, the working machine of the present embodiment will be described with reference to FIGS.

  As shown in FIGS. 10 to 13, the working machine of this embodiment is configured such that an arch-shaped liner plate R is laid down in a tunnel T from a posture to a vertical posture, and the assembled side liner plate R ′ raised. This is used as a liner plate assembling apparatus for sequentially assembling (FIG. 11) to the existing side liner plate R1 (FIG. 10). In addition, the description in the case of using the working machine of this Example as a liner plate assembly apparatus is mentioned later.

  As shown in FIGS. 1 to 3, the working machine of this embodiment includes a self-propelled traveling carriage 1 and a liner plate R (see FIGS. 10 and 10) attached to the chassis 11 of the traveling carriage 1 and lying down. 11) upright device 2 for raising the vehicle to a vertical posture (reference R ′ in FIG. 11), and four devices for raising the traveling vehicle 1 from the ground. Jacks 4, 4, 4A and 4A are provided. In this embodiment, the entire work machine corresponds to the machine body in the claims, and the traveling carriage 1 corresponds to the base in the claims.

  The traveling carriage 1 is provided with left and right wheels (front wheels 13 and 13 and rear wheels 12 and 12) on the lower surfaces of the front and rear parts of the chassis 11, respectively, and this traveling is performed by a driving device (hydraulic motor) (not shown). The carriage 1 can be moved forward and backward. The lateral width of the traveling carriage 1 is designed to be smaller than the lateral width of the loading platform 91 of the transport truck 9 as shown in FIG. 5C, and this working machine is loaded on the transport truck 9 and used at the site of use. Can be transported up to.

  The raising device 2 includes a telescopic boom 21 mounted on the chassis 11 of the traveling carriage 1, hoisting cylinders 22 and 22 for raising and lowering the telescopic boom 21, and holding means for holding a liner plate attached to the tip of the boom. 3.

  When the hoisting cylinders 22 and 22 are in the contracted state, the telescopic boom 21 lies down to a substantially horizontal posture with the boom tip side facing the rear as shown in FIGS. 1 and 2, while the hoisting cylinders 22 and 22 are in the extended state. 11 is raised to a substantially vertical posture shown by a chain line (reference numeral 21 ').

  The liner plate holding means 3 attached to the tip of the boom holds the ceiling portion Rc of the liner plate R as shown in FIGS. Since the holding means 3 is not included in the main configuration of the present invention, its detailed description is omitted.

  The four jacks 4, 4, 4 A, 4 A attached near the four corners of the front, rear, left and right of the chassis 11 are two-stage telescopic types each consisting of a triple cylinder having an outer cylinder 41, an intermediate cylinder 42, and an inner cylinder 43. Is used. These jacks 4, 4, 4 A, and 4 A are configured such that the intermediate cylinder 42 extends and contracts with respect to the outer cylinder 41, and the inner cylinder 43 extends and contracts with respect to the intermediate cylinder 42. The expansion / contraction stroke as a whole is quite large (see the chain lines in FIGS. 1 and 3 and FIG. 5C). And if each jack 4,4,4A, 4A is extended greatly (for example, maximum extension), the space of the height which can enter the loading platform of the truck for conveyance under the traveling cart 1 (refer to Drawing 5 (C)) Can be secured.

  Further, in these four jacks 4, 4, 4A, 4A, the intermediate cylinder 42 and the inner cylinder 43 serve as an expansion / contraction section that expands and contracts with respect to the outer cylinder 41. A front end member 44 made of a rectangular thick plate is attached to the front end member 44, and this front end member 44 serves as a front end portion of the jack expansion / contraction portion.

  The planar outer shape of the tip member 44 is considerably larger than the cross-sectional profile of the inner cylinder 43, and the outer peripheral four sides of the distal member 44 protrude outward from the outer peripheral four surfaces of the inner cylinder 43. The tip member 44 functions as a grounding plate in contact with the ground in the jack upright posture (FIGS. 1 and 3) in which the expansion / contraction part of the jack 4 (or 4A) faces downward as described later. In the inverted posture (FIG. 6) in which the expansion / contraction part is upward, it functions as a scaffolding mounting part for mounting the scaffolding 6.

  These four jacks 4, 4, 4A, 4A can be moved in and out of the left and right sides of the chassis 11 by slide devices 5, 5,. That is, each of the slide devices 5 of the jacks 4, 4, 4A, 4A has an inner cylinder 52 slidably inserted into an outer cylinder 51 fixed to the chassis 11 in a laterally horizontal posture, and the inner cylinder 52 is inserted into the outer cylinder 51. 51 can be slid in the left, right, inner and outer directions by a slide cylinder (not shown). Each jack 4, 4, 4 A, 4 A is mounted on the outer end of the inner cylinder 52 of the slide device 5.

  In the most contracted state of the slide devices 5, 5,..., The jacks 4, 4, 4A, 4A are stored inside the left and right side surfaces of the chassis 11 as shown by the solid lines in FIG. When each slide device 5, 5,... Is extended greatly, each jack protrudes outward from the left and right side surfaces of the chassis 11 as shown by chain lines (reference numerals 4 ', 4A') in FIGS. It has become.

  In the state where each slide device 5, 5.. Is contracted to the minimum, the pair of left and right jacks 4, 4 (and 4 A, 4 A) are positioned so as to fit inside the loading platform width of the transport truck 9, In the state where each slide device 5, 5... Is extended to the maximum, as shown in FIG. 5 (C), the pair of left and right jacks 4, 4 (and 4A, 4A) increases the width of the loading platform 91 of the transport truck 9. It is designed to straddle.

  Among the four jacks 4, 4, 4A, 4A, the left and right two jacks on the front side of the chassis are denoted by reference numeral 4, while the left and right jacks on the rear side of the chassis are denoted by reference numeral 4A. In this embodiment, the two jacks 4, 4 on the front side of the chassis are in an upright posture (the inner tube 43 and the tip member 44) with the expansion / contraction part (the inner tube 43 and the tip member 44) downward with respect to the inner tube 52 of the slide device 5. 1 and FIG. 3) and an inverted posture (FIGS. 6 and 11) in which the telescopic portion (the inner cylinder 43 and the tip member 44) faces upward, while being installed to be turned upside down, 2 on the rear side of the chassis Each of the two jacks 4A, 4A is fixed to the inner cylinder 52 of the slide device 5 in an upright posture (incapable of being turned upside down) with the expansion / contraction portions (the inner cylinder 43 and the tip member 44) facing downward. In this embodiment, the left and right jacks 4 and 4 on the front side of the chassis are targeted as the upside down jacks. However, the upside down jacks may be provided in at least one of all the jacks. (In addition to two, the upside down target jack may be one, three, or four).

  Each of the jacks 4, 4 that can be turned upside down pivotally supports the vicinity of the center of gravity of the jack in the most contracted state with respect to the outer end portion of the inner cylinder 52 of the slide device 5. Specifically, as shown in FIG. 1 and FIG. 3, on the side surface of the inner side of the outer cylinder 41 of the jack 4 in the longitudinal direction at a substantially intermediate position (near the center of gravity), as shown in an enlarged view in FIG. 46 is protruded inward, and the support shaft 46 is held by a bearing 47 at the tip 52 a of the inner cylinder 52 of the slide device 5.

  Thus, assuming that the vicinity of the center of gravity of each jack 4, 4 is the center of rotation, the weight on each side of the jack 4 across the center of rotation is substantially equal, so it is light to flip each jack 4, 4 upside down. Can be done with operating force. In addition, on the front and back sides of each of the jacks 4 and 4 that can be flipped up and down, there are two hand-held handles 45 and 45 at the top and bottom, respectively. .

  On the other hand, between the outer cylinder 41 of the jack 4 that can be turned upside down and the tip 52a of the inner cylinder 52 of the slide device 5, a rotation lock for holding the jack 4 in the upright position and the inverted position, respectively. Means 30 are provided. In this embodiment, the tip 52a of the inner cylinder 52 of the slide device 5 corresponds to “appropriate position on the base side” in the claims (claim 1).

  As shown in FIG. 4, the rotation lock means 30 is movable at the movable plate 31 fixed to the outer surface of the outer cylinder 41 on the jack 4 side in a left-right protruding state and the distal end portion 52 a of the inner cylinder 52 on the slide device 5 side. A lock pin 32 that has a position holding plate 33 fixed at a position close to the plate 31 and that can be inserted into and removed from a position (left position in FIG. 4) that is displaced from the rotation center (support shaft 46) of the movable plate 31. On the other hand, a first pin hole 34 through which the lock pin 32 can be inserted (locked) into the position holding plate 33 in the jack upright posture position and a first pin hole through which the lock pin 32 can be inserted in the jack inverted posture position. 2 pin holes 35 are provided. In this embodiment, the auxiliary lock pin 32A is provided at a symmetrical position across the rotation center from the installation position of the lock pin 32 on the movable plate 31 on the jack 4 side, and the auxiliary lock pin 32A is positioned on the position holding plate 33. The second pin hole 35 or the first pin hole 34 can be supplementarily inserted (locked), but the auxiliary lock pin 32A may be omitted.

  In FIG. 4, in a state where the lock pin 32 on the movable plate 31 side is inserted into the first pin hole 34 on the position holding plate 33 side, the jack 4 is held in an upright posture as shown in FIG. On the other hand, if the lock pin 32 is removed (if the auxiliary lock pin 32A is present, the auxiliary lock pin 32A is also removed), the jack 4 can be turned upside down manually, and the lock on the movable plate 31 side can be Since the pin 32 corresponds to the second pin hole 35 on the position holding plate 33 side, the jack 4 is held in an inverted posture by inserting the lock pin 32 into the second pin hole 35 on the position holding plate 33 side. (Locked). The lock pin 32 can be fixed by a set screw 36 so that it cannot be pulled out.

  By the way, in this embodiment, the upside down operation of the jack 4 that can be turned upside down is performed manually, but in the other embodiments, the upside down operation of the jack 4 is performed by power (for example, a hydraulic cylinder). It may be.

  Each of the jacks 4 and 4 that can be turned upside down is turned upside down in a state in which the jacks are slid outward by the slide device 5 in a contracted state (a state indicated by reference numeral 4 'in FIG. 2 or FIG. 3). That is, if the jack 4 is turned upside down while the jacks 4 and 4 are slid (stored) inward, the jack 4 may collide with the chassis 11. Needs to be performed with the jack 4 slid outward.

  By the way, in another Example, it can implement as follows about the operation | movement restriction | limiting of the jacks 4 and 4 which can be turned upside down.

  First, it is possible to provide a stopper-like safety device that prevents the jack 4 from being turned upside down unless the jack 4 is slid outward. In that case, since the jack 4 cannot be turned upside down carelessly (by erroneous operation) in the jack storage state, it is possible to prevent the jack 4 from colliding with the chassis 11 side. On the other hand, in order to store (slide) the jack 4 inward from the state in which the jack 4 protrudes outward, a stopper-like safety device is provided so that the jack 4 cannot be stored inward unless it is in an upright posture. it can. In that case, since the jack 4 cannot move (slide) inward in a state other than the upright posture (the jack 4 is in a posture that interferes with the member on the chassis 11 inward and outward), Even if the jack 4 is retracted inward in a state other than the upright posture, the inward movement of the jack can be prevented in advance (the jack 4 does not inadvertently interfere with or collide with the chassis 11 side). ).

  In a state where the jacks 4 and 4 that can be turned upside down are in an inverted posture (FIG. 6) with the jack expansion / contraction portion facing upward, the tip member 44 of the jack expansion / contraction portion is positioned at the upper end of the jack 4. 7, the bottom plate 61 of the scaffold base 6 can be detachably attached to the tip member 44.

  That is, as shown in enlarged views in FIGS. 8 and 9, the left and right side edges 44 a and 44 a (see FIG. 8) of the tip member 44 of the jack 4 are slid at positions near the center of the bottom surface of the bottom plate 61 of the scaffold base 6. Each guide receiving portion 62, 62 having an L-shaped cross section that can be freely held is provided, and the respective guide receiving portions 62, 62 of the scaffold base plate 61 are rearward from the front side in FIG. The scaffold base 6 can be mounted on the tip member 44 by sliding fitting.

  Further, as shown in FIG. 9, a stopper 63 serving as a slide end member with respect to the tip member 44 is provided at the front end of both guide receiving portions 62, 62, while the rear of both guide receiving portions 62, 62 is provided. A retaining pin 64 for prohibiting the tip member 44 from being inadvertently pulled out from the guide receiving portions 62 and 62 is inserted into the side end portion in a freely detachable manner. Further, as shown in FIGS. 8 and 9, the left and right side edges of the tip member 44 from the lower surface side of each guide receiving portion 62, 62 with the tip member 44 inserted into both guide receiving portions 62, 62. The scaffolding base plate 61 can be securely fixed on the tip member 44 by tightening the fastening plates 65 and 65 with respect to 44a and 44a.

  The working machine of the embodiment shown in FIGS. 1 to 4 functions as follows.

  First, this work machine is mounted on a transfer truck 9 (see FIG. 5C) and transported to the site of use. This work machine can be used as shown in FIGS. 5A to 5C. The jacks 4, 4 (4A, 4A) can function as a self-loading / unloading device.

  In other words, in this case, the jacks 4 and 4 (4A and 4A) are in a state in which the extendable portion (the tip member 44) faces downward as shown in FIGS. As shown in FIG. 5 (B), the right and left slide devices 5, 5 project outward from the state, and then, as shown in FIG. 5 (C), the four jacks 4, 4 (4A, 4A) are moved. Each is extended greatly to secure a space on the lower surface side of the traveling carriage 1 that is higher than the height of the loading platform 91 of the truck 9 and wider than the loading platform 91 of the truck 9.

  In this state, as shown in FIG. 5 (C), after the truck carrier 91 is moved backward into the empty space below the traveling carriage 1, the jacks 4, 4 (4A, 4A) are fully reduced. At the same time, each of the jacks 4 and 4 (4A and 4A) is inserted inward by the slide devices 5 and 5, so that the working machine can be loaded on the truck bed 91 by itself. When the machine is lowered to the ground, the work may be performed in the reverse order to the loading work.

  On the other hand, as shown in FIGS. 6 to 9, this working machine can function two jacks 4, 4 that can be turned upside down as functions for supporting the scaffold base 6.

  That is, in order to make each of the jacks 4 and 4 function to support the scaffolding base 6, if the lock pin 32 (and the auxiliary lock pin 32A) shown in FIG. Can be flipped up and down.

  By the way, the working machine of this embodiment is used for assembling the liner plate in the tunnel T as shown in FIGS. 10 to 13. In this case, as shown in FIGS. The two jacks 4 and 4 are respectively set in an inverted posture, and the bottom plate 61 of the scaffold base 6 is fixed to the tip members 44 and 44 at the upper end portions of the jacks (refer to FIGS. 8 and 9 for details).

  Then, as shown in FIG. 10, the work machine with the scaffolding platform 6 is moved to the vicinity of the ceiling portion Rc of the liner plate R assembled in a lying position at a predetermined position in the tunnel T in a boom lying position. After that, the telescopic boom 21 is extended and the inner surface of the liner plate ceiling Rc is held by the holding means 3 (reference numeral 3 ') at the boom tip. Subsequently, the telescopic boom 21 is raised to the vertical posture as shown by reference numeral 21 'in FIG. 11, so that the liner plate is raised to the vertical posture shown by reference numeral R', and the raised assembly side liner plate R 'is raised. Is aligned with the existing liner plate R1 (FIG. 10), and both liner plates R1, R are bolted.

  By the way, this kind of liner plate R is used in various sizes, depending on the construction site, as shown in FIG. Note that the liner plate R in FIG. 12 has a relatively small size (for example, a lateral width of about 4.5 m), and the liner plate R in FIG. 13 has a relatively large size (for example, a lateral width of about 6.0 m). However, even with the small liner plate R shown in FIG. 12, the height to the ceiling portion Rc is 4 m or more. Use stands 6 and 6.

  Then, as shown in FIG. 12 or 13, the slide length of each slide device 5, 5 and the extension length of the jacks 4, 4 are adjusted according to the size (height and width) of the liner plate R, respectively. By doing so, it can carry out, moving each scaffold base 6 and 6 to each position suitable for each bolting operation | work sequentially.

  The working machine of the above embodiment has the following functions.

  First, the levitation jacks 4 and 4 are installed so that they can be turned upside down, and the scaffold base 6 is detachably attached to the distal end portion (tip member 44) of the expansion / contraction portion of the jack in the posture in which the jack 4 is inverted. Therefore, a single jack 4 can share the driving device for flying the aircraft and lifting the platform. Therefore, as the number of drive devices is reduced, the overall weight of the machine body can be reduced, the equipment cost can be reduced, and the effective space can be increased.

  Also, each of the jacks 4 and 4 that can be turned upside down can be held (locked) in an upright position and an inverted position by the rotation lock means 30, so that the jack 4 is turned upside down. Even if it exists, this jack 4 can be locked by each use attitude | position (safety can be ensured).

  Also, since the jack 4 that can be turned upside down has a function of being able to load and unload the working machine on and from the truck bed 91 by itself, other loading and unloading devices (for example, another crane) are provided when the working machine is transported. It is not necessary to prepare.

  Further, the jack 4 that can be turned upside down pivotally supports the vicinity of the center of gravity of the jack so that the jack 4 can be turned upside down with a light work force.

  1 is a base (traveling carriage), 4 is a jack that can be turned upside down, 4A is a posture-fixed jack, 5 is a slide device, 6 is a scaffolding base, 9 is a transport truck, and 43 is an inner cylinder that serves as a jack extension / contraction section. , 44 is a tip member which becomes the tip of the jack expansion / contraction part, 46 is a support shaft (rotation center), and R is a liner plate.

Claims (3)

A work machine equipped with a plurality of jacks for levitating the airframe from the ground on the base, and capable of being equipped with a scaffolding platform for worker boarding on the base so as to be able to move up and down,
While at least one jack of the plurality of jacks is installed upside down between an upright posture in which the stretchable portion faces downward with respect to the base and an inverted posture in which the stretchable portion faces upward,
Between the jack and a suitable position on the base side, provided with a rotation lock means for holding the jack in the upright posture and the inverted posture, respectively,
In the posture in which the upside down reversible jack is turned upside down, the scaffolding base can be detachably attached to the distal end portion of the stretchable portion.
A work machine characterized by that. In claim 1,
The jacks are arranged at four positions on the front, rear, left and right necessary to move the airframe up to a height at which the truck bed can enter the lower surface of the airframe.
Each of the jacks is installed such that a pair of jacks facing left and right with respect to the base can protrude and appear between a position that fits inside the truck bed width and a position that straddles the truck bed width. ,
A work machine characterized by that. In claim 1 or 2,
-The upside-down reversible jack pivotally supports the vicinity of the center of gravity of the jack in the most contracted state of the jack.
A work machine characterized by that.

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