JP2013035666A - Portal traveling crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portal traveling crane which enables the inspections of both a power generation device and ancillary facilities of the power generation device, can avoid the possibility of the contact of a leg member on the power generation device, and prevents a traveling path from disturbing the walking of workers and the traveling of a carriage.SOLUTION: This portal traveling crane includes: the carriage 1 which can travel along the power generation device (M) and includes wheels and a guide ring; the traveling path 5 for the carriage 1 which is installed on a floor surface on both sides of the power generation device (M); leg members 8 installed on the carriage 1; a main girder 14 which is installed between the leg members 8 and over the power generation device (M) and to which a crane rail 15 is provided; a hoist 16 which traverses along the crane rail 15; and a control panel for controlling the operation of the crane. The traveling path 5 includes a track plate on which the wheels travel and a guide plate which is fixed onto the track plate and on which the guide ring travels. The leg members 8 are telescopic, and the crane rail 15 extends horizontally from both ends of the main girder 14 outward so that the ancillary facilities can be inspected.

Description

  The present invention relates to a portal traveling crane, in particular, periodic inspection and maintenance of power generation equipment including a turbine main engine and a generator installed on the floor of a turbine building of a thermal power plant (hereinafter simply referred to as inspection). It is related with the portal type traveling crane used for.

  Conventionally, on the floor of a turbine building of a thermal power plant, power generation equipment consisting of a turbine main engine, power generator, etc. and its incidental equipment have been installed. When inspecting the power generation equipment, it is installed on a pillar in the turbine building. A large overhead crane is used to disassemble, assemble, and lay down power generation equipment. A plurality of power generators are installed in parallel in the turbine building, and the overhead crane is installed in the turbine building so as to straddle the plurality of power generators.

  However, when all operations such as disassembly, assembly, laydown, etc. from large-weight structures such as power generation equipment casings, rotors, etc. to power equipment bearing stand covers, nozzles and other small-weight structures are performed only by overhead cranes, There were the following problems.

  Since an overhead crane is large-sized, the crane lifting speed, the hanging speed, and the moving speed of the crane along the crane rail must be limited to a low speed for safety. Therefore, in the case of large-weight structures such as casings and rotors of power generation equipment, it is necessary to work at low speed operation in the case of small and light-weight structures such as bearing stand covers and nozzles of power generation equipment. As a result, it takes a long time to disassemble, assemble, and lay down the power generation equipment, and the inspection time becomes longer.

  An example of a portal traveling crane for solving the above problem is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 7-101684). Hereinafter, this portal traveling crane is referred to as a conventional portal traveling crane A, and will be described with reference to the drawings.

  FIG. 10 is a perspective view showing a conventional portal traveling crane A, FIG. 11 is a perspective view showing an assembling method of the conventional portal traveling crane A, and (a) is a perspective view showing an assembled state on the floor surface. (B) is a perspective view which shows the state which starts the conventional portal traveling crane A assembled on the floor surface.

  As shown in FIGS. 10 and 11, the conventional portal crane C includes a main girder 21, leg members 22 a, 22 b, 22 c, 22 d whose upper ends are pivotally supported on both sides of the main girder 21, and leg members 22 a. , 22b, 22c, 22d, connecting members 23a, 23b, 23c, 23d pivotally supported on the lower end portions, trolleys 24a, 24b, 24c, 24d fixed to the connecting members 23a, 23b, 23c, 23d, and main girder The hoist 26 which traverses along the crane rail 25 provided in 21 and the control panel 27 which controls the operation | movement of a crane are provided.

  The conventional portal traveling crane A travels along carts 24a, 24b, 24c, and 24d along a traveling rail 28 laid on the floor surface. The traveling rail 28 is installed along the power generation device on both sides of the power generation device (not shown). The installation direction of the traveling rail 28 is orthogonal to the traveling direction of the overhead crane 29.

  To assemble the conventional portal crane A, as shown in FIG. 11 (a), the upper ends of the leg members 22a, 22b, 22c and 22d are pivotally supported on both ends of the beam member 21 on the floor surface, The lower end portions of the leg members 22a, 22b, 22c, and 22d are pivotally supported by the connecting members 23a, 23b, 23c, and 23d, and the connecting members 23a, 23b, 23c, and 23d are fixed to the carriages 24a, 24b, 24c, and 24d.

  Next, as shown in FIG. 11 (b), the main girder 21 is lifted by an overhead crane 29. When the main girder 21 is lifted, the leg members 22a, 22b, 22c, 22d are pivotally supported by the main girder 21 and the connecting members 23a, 23b, 23c, 23d. 25b, 25c, and 25d, along the traveling rail 28 as shown by the arrows in FIG. 11 (b) until the connecting members 23a and 23b and the connecting members 23c and 23d approach each other and come into contact with each other. And run.

  When the connecting members 23a and 23b and the connecting members 23c and 23d are in contact with each other in this way, the connecting members 23a and 23b are connected and the connecting members 23c and 23d are connected. As a result, as shown in FIG. 10, the leg members 22a, 22b, 22c, and 22d are raised, and the assembly of the conventional portal traveling crane A is completed.

  In order to inspect the power generation equipment in the turbine building with the conventional gate-type traveling crane A, the traveling rails 28 are installed on both sides of the power generation equipment along the power generation equipment, and work such as disassembly, assembly, and laydown of the power generation equipment is performed. .

  In this way, when the inspection of one power generation device is completed, the conventional portal traveling crane A is lifted by the overhead crane 29 and moved to another power generation device, and the inspection is performed in the same manner.

Japanese Patent Laid-Open No. 7-101684 JP-A-9-315767

  The conventional portal traveling crane A described above has the following advantages.

  The crane can be easily assembled, and because it is small in size, it can be operated at a higher speed than a large overhead crane, so that operations such as disassembling, assembling, and laying down the power generator can be performed in a short time. As a result, the inspection time can be shortened as compared with the case where inspection is performed with an overhead crane. The effect of shortening the inspection time is further improved by simultaneous use of the conventional portal crane A and the overhead crane.

However, the conventional portal crane A has the following problems.
(1) Normally, auxiliary equipment such as a main steam valve and a high-temperature reheat valve is installed in the power generation equipment, and these auxiliary equipment are installed on the floors on both sides of the power generation equipment. On the other hand, the length of the crane rail 25 in which the hoist 26 traverses is the length of the main girder 21, and the main girder 21 does not protrude outward from the leg members 22a, 22b, 22c, 22d. As a result, the conventional gate-type traveling crane A could not lift the incidental facilities installed on the floors on both sides of the power generator, and the incidental facilities could not be inspected. Therefore, it was unavoidable to use another crane.
(2) When the conventional gate-type traveling crane A is lifted by the overhead crane 29 and moved to another power generating device, the leg members 22a, 22b, 22c, and 22d may hit the power generating device, which may make it difficult to move. .
(3) The traveling rail 28 on which the carriages 24a, 24b, 24c, and 24d move is laid on the floor surface. If the traveling rail 28 protrudes greatly from the floor surface, the walking of the worker and the traveling of the transport carriage are prevented. There was a risk of inhibition.
(4) To connect the carriages 24a, 24b, 24c, and 24d, it is necessary to align the trucks, and it takes time to assemble the crane.

  Therefore, an object of the present invention is to perform inspection of both the power generation equipment and the incidental facilities of the power generation equipment with one portal traveling crane, and when the portal traveling crane is lifted by an overhead crane and moved to another power generation equipment. , It is possible to avoid the possibility that the leg members of the portal crane are in contact with the power generation equipment, the straight traveling crane can be moved straight along the power generation equipment, and the travel passage of the portal crane can be installed. It is an object of the present invention to provide a portal traveling crane that can be easily performed and that does not obstruct the walking of a worker or traveling of a transport carriage.

The present invention and the like have obtained the following knowledge as a result of diligent and examination to solve the above problems.
(A) If the length of the crane rail on which the hoist traverses is extended, it is possible to check the incidental facilities installed on both sides of the power generation equipment without installing another crane.
(B) If the leg member of the portal traveling crane can be extended and contracted, it is possible to avoid the possibility that the leg member hits the power generating device when the portal traveling crane is lifted by the overhead crane and moved to another power generating device. .
(C) If the traveling path on which the portal traveling crane travels is constituted by the track plate material and a guide plate having a low height fixed thereon, the portal traveling crane can be surely moved straight along the power generator. In addition, since the protruding height of the guide plate from the traveling path is low, the traveling path does not hinder the walking of the worker or the traveling of the transport cart.
(D) If the traveling path is configured by connecting a plurality of traveling path pieces to each other, the traveling path can be easily installed, moved, and extended.

  The present invention has been made on the basis of the above findings (a) to (d), and is characterized by the following.

  The invention according to claim 1 is a portal traveling crane installed in a turbine building of a thermal power plant, and is in line with power generation equipment including a turbine main unit, a generator, and the like installed in the turbine building. A vehicle equipped with wheels and guide wheels that can travel, a traveling path installed on the floors on both sides of the power generation device, the vehicle traveling on the vehicle, a leg member installed on the vehicle, A main girder provided with a crane rail installed across the power generation equipment between leg members, a hoist that traverses along the crane rail, and a control panel that controls the operation of the crane; Consists of a raceway plate material on which the wheels run, and a guide plate on which the guide wheels run, fixed on the raceway plate material, the leg members are extendable, and the crane rail is the power generator. Are installed on both sides of the floor, it said to allow the inspection of incidental facilities of the generator device, and it has the characteristics that protrudes horizontally outward from both ends of the main girder.

  The invention according to claim 2 is characterized in that, in the portal traveling crane according to claim 1, the traveling passage is composed of a plurality of traveling passage pieces connected to each other. .

  According to a third aspect of the present invention, in the portal traveling crane according to the first or second aspect, two of the leg members are vertically installed on the carriage, and the upper portions of the two leg members are mutually connected. It is characterized by being inclined inward.

  According to the present invention, by extending the crane rail horizontally from both ends of the main girder to the outside, it is possible to check both the power generation equipment and the incidental equipment of the power generation equipment with one gate-type traveling crane, In addition, by making the leg members extendable, when the portal crane is lifted by an overhead crane and moved to another power generator, the possibility that the leg members of the portal crane contact the generator is avoided. Furthermore, the traveling path that the portal traveling crane travels is composed of a track plate material that is placed on the floor and a guide plate that is fixed on the track plate. It is possible to move straight along the road, and it is easy to install the traveling path of the portal crane. Moreover, the traveling path hinders the walking of workers and traveling of the transport cart. Ruosore it is possible to provide a portal traveling crane is not.

  Further, by configuring the travel path by connecting a plurality of travel path pieces to each other, the travel path can be easily installed, moved, and extended.

It is a front view which shows the portal traveling crane of this invention. It is an AA arrow line view of FIG. It is a top view which shows the traveling path of the portal traveling crane of this invention installed in the floor on both sides of the electric power generation apparatus. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is a partial omission side view showing the leg member of the portal type traveling crane of this invention. It is the DD arrow line view of FIG. It is sectional drawing which shows the other clamp means attached to the intermediate | middle cylinder. It is an AA arrow line view of FIG. It is a perspective view which shows the conventional portal traveling crane A. It is a perspective view which shows the assembly method of the conventional portal traveling crane A, (a) is a perspective view which shows the assembly state on a floor surface, (b) stands the conventional portal traveling crane A assembled on the floor surface. It is a perspective view which shows the state raised. It is a front view which shows the conventional portal traveling crane B.

  One embodiment of the portal traveling crane of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view illustrating a portal traveling crane according to the present invention, and FIG. 2 is a view taken along the line AA in FIG.

  1 and 2, reference numeral 1 denotes a pair of carts that travel along travel paths (described later) installed on floors on both sides of a power generation device (M) including a turbine main engine, a generator, and the like. As shown in FIG. 5, the carriage 1 includes wheels 2 and guide wheels 3, and the wheels 2 are provided at the four corners of the lower part of the carriage 1 as shown in FIG. 4, and drive means 4 (FIGS. 2 and 5). In this manner, the vehicle travels on a track plate material in a travel path described later. The outer periphery of the wheel 2 is covered with urethane rubber to reduce noise. The guide wheel 3 is provided between the wheels 2, and flanges 3a are formed on both sides. The carriage 1 is guided between the flanges 3a, which will be described later, so that the carriage 1 is guided. Thus, the portal traveling crane moves straight along the power generator (M).

  Reference numeral 5 denotes a travel path on which the cart 1 travels. As shown in FIG. 5, the traveling path 5 is installed on the floor surface on both sides of the power generation device (M), and is fixed on the track plate material 6 on which the wheels 2 travel and the center in the width direction of the track plate material 6. The guide wheel 3 includes a guide plate 7 on which the guide wheel 3 travels. The guide wheel 3 is not in contact with the track plate material 6. The track plate material 6 is made of an iron plate having a width of 2 mm to 3 mm and having a width dimension that allows the wheels 2 to travel, and is placed on the floors on both sides of the power generator (M). The guide plate 7 is made of an iron plate having a thickness of about 6 mm. Thus, since the protrusion height from the floor surface of the track plate material 6 and the guide plate 7 is low, there is no possibility of obstructing the walking of the worker and the traveling of the transport cart due to the barrier-free effect. The traveling path 5 is divided into a plurality of traveling path pieces, and the traveling path pieces can be connected to each other. Thus, by dividing the traveling passage 5 into a plurality of traveling passage pieces, the traveling passage 5 can be installed and moved easily.

  Reference numeral 8 denotes a leg member having a square cross section installed on both ends of the carriage 1. The upper end of the leg member 8 is connected by a main girder described later. As shown in FIG. 6, the leg member 8 has a sheath structure comprising an outer cylinder 8a, an intermediate cylinder 8b inserted into the outer cylinder 8a, and an inner cylinder 8c inserted into the intermediate cylinder 8b, and can be expanded and contracted. ing. By making the leg member 8 extendable and retractable, if the leg member 8 is extended, a necessary working head can be easily secured. If the leg member 8 is contracted, the portal traveling crane is used as an overhead crane 18 (see FIG. 1). When lifting and moving to another power generator, the risk of the leg member 8 coming into contact with the power generator (M) can be reliably avoided. That is, it is not necessary to disassemble the leg member 8 short. The leg member 8 is not limited to three stages. In addition, by making the leg member 8 extendable and retractable, the hoist 16 and the like to be described later can be inspected regardless of the work at high places by contracting the leg member 8.

  Since the extension and contraction of the leg member 8 is performed using an overhead crane, it is not necessary to install a drive source such as a hydraulic cylinder on the leg member 8. As a result, it is possible to prevent an accident due to the failure of the drive source and the contraction of the leg member 8 due to oil leakage.

  In the conventional portal traveling crane A, in order to assemble the main girder 21 and the leg members 22a, 22b, 22c, and 22d on the ground, it is necessary to assemble the leg members horizontally. For this reason, each leg member needs to be a straight member.

  However, in the portal traveling crane of the present invention, since the leg member 8 can be expanded and contracted, the main girder 14 and the leg member 8 which will be described later can be assembled without depending on the height work, so the shape of the leg member 8 is changed. It can be designed in any shape. In this example, the upper portions of the inner cylinders 8c of the leg members 8 are inclined inward from each other (see FIG. 2).

  In this way, by allowing the upper portions of the leg members 8 to incline toward each other, the distance adjustment width of the leg members 8 in the crane traveling direction is widened. For example, as the distance between the leg members 8 is increased, the stability of the leg members 8 increases. However, if the leg members 8 are not inclined inward, the installation of the main beam 14 is hindered. However, this problem can be solved by inclining the leg members 8 inward. That is, the leg members 8 can be designed between the minimum legs that can ensure the stability of the leg members 8 by inclining the leg members 8 inward. As a result, the length of the carriage 1 can be minimized, so that the maximum work range can be ensured. In addition, by minimizing the length of the carriage 1, the carriage can be integrated without being divided like the conventional gate-type traveling crane A, so that the work of aligning the carriages becomes unnecessary. As a result, the crane assembly work can be shortened.

  Note that Patent Document 2 discloses a conventional portal crane C having a leg member 33 composed of an upper leg 31 and a lower leg 32 connected by a hinge 30 as shown in FIG. The leg members 33 are configured such that they can be bent inward by a hydraulic cylinder or the like in a plane orthogonal to the crane traveling direction. According to the conventional portal crane C, the leg member 33 is configured to be bent, so that the leg member 33 can be easily assembled, but the height of the leg member 33 cannot be adjusted. Moreover, the assembly of the leg member 33 is performed via a hydraulic cylinder. When the leg member 33 is erected, if a foreign object or the like is caught in the contact portion between the upper leg 31 and the lower leg 32, the leg member 33 There was a possibility that troubles such as unsuccessful assembly could occur.

  However, such a trouble does not occur if the leg member 8 is configured to be extendable and retractable like the portal traveling crane of the present invention.

  As shown in FIG. 7, a slide member 9 is attached to the upper end portion of the intermediate cylinder 8b so that the inner cylinder 8c can be smoothly expanded and contracted with respect to the intermediate cylinder 8b. The same applies to the outer cylinder 8a and the intermediate cylinder 8b. As shown in FIG. 7, the inner cylinder 8 c can be temporarily fixed to the intermediate cylinder 8 b by the clamping means 10. The clamp means 10 includes a clamp lever 11 and a clamp bar 12 screwed into the intermediate cylinder 8b. By turning the clamp lever 11, the tip of the clamp bar 12 presses the inner cylinder 8c, and thus the inner cylinder 8c is Temporarily fixed to the intermediate cylinder 8b. The inner cylinder 8c temporarily fixed to the intermediate cylinder 8b is permanently fixed by inserting a pin (not shown) into a pin hole 13 formed in the intermediate cylinder 8b and the inner cylinder 8c. The structure of these temporary fixing and permanent fixing is the same in the outer cylinder 8a and the intermediate cylinder 8b.

  Another clamping means for temporarily fixing the intermediate cylinder 8b and the inner cylinder 8c will be described. FIG. 8 is a cross-sectional view showing another clamping means attached to the intermediate cylinder 8b, and FIG. 9 is a view taken along the line AA of FIG.

  The other clamping means 19 is configured such that by turning the clamp lever 11, the wedge 20 and the clamp bar 12 screwed into the intermediate cylinder 8b can be integrally advanced and retracted, and the diagonal corners of the intermediate cylinder 8b are provided. It is attached to the part. The wedge 20 is inserted into the gap between the inner cylinder 8c and the intermediate cylinder 8b through the slit (S) formed in the intermediate cylinder 8b. At the same time as the wedge 20 is forcibly inserted into the gap, the tip of the clamp bar 12 presses the inner cylinder 8c, and thus the inner cylinder 8c and the intermediate cylinder 8b are firmly and temporarily fixed. The outer cylinder 8 a and the intermediate cylinder 8 b are also temporarily fixed by other clamping means 19.

  Reference numeral 14 denotes a main girder installed across the power generating device (M) between the upper end portions of the leg members 8. The installation direction of the main girder 14 is orthogonal to the traveling direction of the overhead crane 18. The main girder 14 is provided with a crane rail 15. As shown in FIG. 1, the crane rail 15 projects horizontally from both ends of the main beam 14 outward. In FIG. 1, the overhanging portion of the crane rail 15 is indicated by (L). By projecting the crane rail 15, it is possible to check the incidental facilities of the power generation equipment (M) installed on the floors on both sides of the power generation equipment (M). For example, as shown in FIG. 1, in the incidental equipment, in a general turbine layout, MSV (main steam valve), RSV (high temperature reheat valve), etc. are arranged on the left and right of the turbine. The crane rail 15 between the leg members 8 is traversed and cannot be lifted by a hoist described later. However, by projecting the crane rail 15 from both ends of the main girder 14 to the outside of the leg member 8, these incidental facilities can be lifted, and thus the incidental facilities can be inspected.

  A hoist 16 traverses along the crane rail 15. The hoist 16 traverses along the crane rail 15 projecting outside the leg members 8 as well as between the leg members 8, thereby enabling inspection of incidental facilities.

  As shown in FIG. 2, 17 is a control panel for running the carriage 1 and operating the hoist 16 and the like.

  According to the portal traveling crane of the present invention described above, the power generation equipment (M) in the turbine building and the incidental facilities of the power generation equipment (M) are inspected as follows.

  First, the traveling path 5 is installed on the floor surface on both sides of the power generator (M). In installing the traveling path 5, the traveling path pieces are placed on the floor surface, and the traveling path pieces are connected in series along the power generation equipment (M). As described above, when the travel path 5 is installed, the travel path pieces need only be placed on the floor surface and the travel path pieces need only be connected to each other. Therefore, the travel path 5 can be easily installed and extended easily. . Since the traveling passage 5 can be easily installed, a plurality of traveling passages 5 can be provided in the turbine building, and a crane can be arranged in accordance with the construction process. In addition, when combined with the fact that the crane can be easily moved by an overhead crane, the effect of the traveling passage 5 that is easy to install is great.

  In this way, when the installation of the travel path 5 is completed, a crane is assembled on the travel path 5. At this time, the height of the leg member 8 is adjusted by temporarily fixing the leg member 8 with the clamp means 10 and then inserting a pin (not shown) into the pin hole 13 at a predetermined height position matching each other.

  In this way, when the assembly of the crane is completed, the hoist 16 is traversed along the crane rail 15 between the leg members 8, whereby the power generation equipment (M) can be inspected, and the crane protruding outside the leg members 8. By causing the hoist 16 to traverse along the rail 15, it is possible to check the band equipment of the attached power generation equipment (M).

  In order to move the portal traveling crane in order to check the next power generation equipment (M), the portal traveling crane is lifted by the overhead crane 18 as shown in FIG. The travel path 5 that has been removed is relocated to the floor of the next power generator (M). At this time, the traveling passage 5 can be easily relocated because the traveling passage 5 is divided into a plurality of traveling passage pieces. Thereafter, the portal traveling crane is suspended on the traveling passage 5 that has been relocated.

  When the portal traveling crane is moved, if the leg member 8 is contracted, the leg member 8 is not likely to come into contact with the power generating device (M). Therefore, the portal traveling crane can be safely used as the next power generating device (M). Can be moved.

As described above, according to the present invention, the following effects are brought about.
(A) By extending the crane rail 15 horizontally from both ends of the main girder 14 outward, both the power generation equipment (M) and the incidental equipment of the power generation equipment (M) can be performed by a single portal crane. Can be checked.
(B) By making the leg member 8 extendable and retractable, when the portal crane is lifted by the overhead crane 18 and moved to another power generator (M), the leg member 8 contacts the power generator (M). The fear can be surely avoided.
(C) In a portal crane with a high lift in consideration of workability, since the leg member 8 becomes long, it may be difficult to move the existing overhead crane, but by making the leg member 8 extendable and retractable The existing overhead crane can be relocated while securing the lift required for the work. Further, by making the leg member 8 extendable and retractable, assembly, disassembly, and transfer can be performed without interfering with the highest power generation equipment (M) in the turbine building.
(D) A track plate member 6 that travels while the guide wheel 3 of the carriage 1 is fitted in the traveling passage 5 on which the portal traveling crane travels, and a guide plate 7 that is fixed thereon. By forming the raceway plate material 6 and the guide plate 7 with thin plates, the portal traveling crane can be surely moved straight along the power generator (M), and the traveling path 5 of the portal traveling crane 5 Can be easily installed, and there is no possibility that the traveling path 5 will hinder the walking of the worker or the traveling of the transport cart.

1: Cart 2: Wheel 3: Guide wheel 3a: Flange 4: Drive means 5: Traveling path 6: Track plate material 7: Guide plate 8: Leg member 8a: Outer cylinder 8b: Intermediate cylinder 8c: Inner cylinder 9: Slide member 10 : Clamping means 11: Clamp lever 12: Clamp bar 13: Pin hole 14: Main girder 15: Crane rail 16: Hoist 17: Control panel 18: Overhead crane 19: Other clamping means 20: Wedge 21: Main girder 22a-22d : Leg member 23a-23d: Connecting member 24a-24d: Bogie 25: Crane rail 26: Hoist 27: Control panel 28: Travel rail 29: Overhead crane 30: Hinge 31: Upper leg 32: Lower leg 33: Leg member

Claims (3)

A portal traveling crane installed in a turbine building of a thermal power plant,
Installed on the floor surface on both sides of the power generation equipment, which is installed in the turbine building, is capable of traveling along power generation equipment composed of a turbine main engine, a generator, etc., and has wheels and guide wheels. A traveling path through which the carriage travels, a leg member installed on the carriage, a main girder provided with a crane rail installed across the power generation equipment between the leg members, and the crane rail. A hoist that traverses along the road and a control panel that controls the operation of the crane, and the travel path includes a raceway plate material on which the wheels run, and a guide plate that is fixed on the raceway plate material and on which the guide wheels run. The leg members are extendable and the crane rails are installed on the floors on both sides of the power generation equipment, so that the auxiliary facilities of the power generation equipment can be inspected. Both ends Gantry crane, characterized in that protrudes horizontally toward the al outwardly.   The portal traveling crane according to claim 1, wherein the traveling passage is formed by connecting a plurality of traveling passage pieces to each other.   3. The portal type travel according to claim 1, wherein two leg members are vertically installed on the carriage, and upper portions of the two leg members are inclined inward from each other. 4. crane.

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