JP5322506B2 - Heavy material transport system and transport method - Google Patents

Description

  The present invention relates to a method for transporting heavy objects such as a wave-dissipating block economically and efficiently.

  For example, in the case of construction work such as a nuclear power plant or thermal power plant in a coastal area, wave-dissipating blocks are regularly arranged from the quay to the offshore for the purpose of revetment with a specified top width and surface slope. Wave extinguishing work is performed. It is known that wave-dissipating works generally have a long construction period and a large number of wave-dissipating blocks, depending on the size of the quay.

As the wave-dissipating block, for example, called tetrapod (registered trademark), an unreinforced concrete block including four truncated conical legs extending radially is often used. The wave-dissipating block is usually a heavy object and has a large transportation cost. Therefore, the wave-dissipating block is manufactured at a wave-dissipating block manufacturing plant temporarily installed near the quay where the wave-dissipating work is to be performed, Temporarily placed. After that, in order to place them on the quay, the trailer is reciprocated from the temporary storage site to the wave-dissipating block unloading site near the quay. Conventionally, the wave-dissipating block is installed by a large crane installed at the temporary storage site and the unloading site. Loading into the trailer and unloading of the wave-dissipating block from the trailer. Since these large cranes are not required after the completion of construction, they are usually procured and installed by lease.
JP 2004-142837 A JP 2003-522697 A

  However, the installation of large cranes at the temporary storage site and the unloading site during the long-term wave-extinguishing work only increases the lease fee when these cranes are procured through leases. Not only that, it is necessary to place slinging workers in both places, which is very uneconomical. Moreover, since loading and unloading of the wave-dissipating block with a large crane takes a certain amount of time and labor, there is a problem that the efficiency of conveying the wave-dissipating block between these two points is poor.

  Accordingly, the present invention provides a system and method for transporting heavy objects such as a wave-dissipating block that solves such problems and is more economical than conventional methods using two cranes and improves transport efficiency. With the goal.

According to one aspect of the present invention, the object is to provide a transport vehicle having a platform that can be moved up and down, and to be placed on the platform in a state of projecting on both sides in the width direction, and to provide a wave-dissipating block as a heavy object. A transport stand that can be loaded and pivoted between a vertically erected state and a horizontal state, facing both ends in the longitudinal direction of the transport vehicle, and the transport to the handling area The vehicle is disposed at an interval that allows the vehicle to enter, and when the transporting vehicle that has moved up to a predetermined position with the loading platform raised in the meantime lowers the loading platform, both ends of the transportation platform are received at the tops, respectively. And at least one pair of fixed cradle for supporting the transport cradle in a bridged state.

In addition, according to another aspect of the present invention, the object is to stand vertically on both ends of the transport vehicle in the longitudinal direction on the transport platform of the transport vehicle including a load platform capable of moving up and down in the first cargo handling place. A transport stand provided with handrails that can rotate between the installed state and the horizontal state is placed by projecting from both sides in the width direction of the transport vehicle, and a wave-dissipating block is loaded thereon as a heavy object The transport vehicle is transported to the second loading place by the transport vehicle, and the load platform is raised between a pair of fixed cradles spaced apart by a distance slightly larger than the width of the transport platform of the transport vehicle. The transport vehicle that has entered to a predetermined position lowers the loading platform, and receives both ends of the transport platform in a state where the handrail is erected vertically at the top of the fixed support platform to bring the transport platform into a bridged state. Special support for storage It is achieved by the method for transporting heavy to.

  According to the heavy material transport system and the transport method of the present invention, since handling with a crane can be omitted in at least one of the cargo handling places, the cost and the arrangement of slinging workers can be reduced more than when two conventional cranes are installed. In this respect, it becomes economical and the transportation efficiency is improved.

  Next, taking as an example the conveyance of a wave-dissipating block frequently used for wave-dissipation work on a coastal quay or the like, the heavy-material conveying system of the present invention will be described in detail with reference to the accompanying drawings. In the following, it is assumed that Tetrapod (registered trademark) having four truncated conical legs extending radially as a wave-dissipating block is used. In the production of the wave-dissipating block 10, a wave-dissipating block production plant is usually temporarily installed in the vicinity of the quay where the wave-dissipating work is to be performed. In this manufacturing plant, first, the required mass of the wave-dissipating block is determined by Hudson's formula using data such as the density of concrete, the design slope of the surface slope after wave-dissipation, and the design wave height, and the volume corresponding to this is determined. The wave-dissipating block 10 is manufactured by pouring concrete into a steel mold provided and hardening it, and then releasing the mold and curing it under predetermined conditions. The various wave-dissipating blocks having a normal mass in the range of 0.5 to 80 t thus obtained are temporarily placed in a temporary storage place that is a loading place. In addition, a trailer having a bed that can be moved up and down is used for the transport vehicle of the wave-dissipating block, and a crane is used for loading the wave-dissipating block on the transport vehicle at the loading site.

  FIG. 1 is a diagram illustrating an example of a heavy material transport system and a transport method according to the present invention. In this figure, reference numeral 10 is a wave-dissipating block, 12 is a transportation platform, 20 is a crane, 30 is a trailer, 31 is a loading platform, and 40 and 46 are fixed platforms. 2 includes an enlarged view of FIG. 1 (b), and is a diagram showing a state in which the wave-dissipating block is loaded on the trailer loading platform, and FIG. 3 shows (c-1) and (c-2) in FIG. ) Is an enlarged view. Further, FIG. 4 is a view of the fixed cradle on which the wave-dissipating block is placed as viewed from a direction perpendicular to the direction in which the trailer enters.

  As shown in FIG. 2 or FIG. 3, the transport frame 12 fixes two long supporting aggregates R1 and R2 arranged in parallel to each other, and both the aggregates R1 and R2 in a substantially parallel manner. For this purpose, a skeleton structure having a substantially rectangular shape in plan view, which is a combination of longitudinal members 13 and 13 having a predetermined length for connecting both ends thereof, is provided. If the transportation platform 12 has a shape that allows the bottom surface to be placed on the loading platform of the trailer 30 and has a structure and strength characteristics that allow the wave-dissipating block 10 to be loaded thereon, does the transportation platform 12 include the skeleton structure described above? No particular limitation is imposed on the overall shape and structure.

Among the skeletal structures, the supporting aggregates R1 and R2 are three truncated cones that extend radially of the wave-dissipating block 12 when the wave-dissipating block 12 is loaded on the carrier base 12, respectively. It is the main member that directly receives the tip of the leg. Therefore, each of the supporting aggregates R1 and R2 supports the wave-dissipating block 12 in these intermediate regions and receives the load in the region, and even when both ends in the longitudinal direction are supported and in a crosslinked state. It is required to have rigidity (strength characteristics) that hardly causes deformation such as deflection. In FIG. 2 and FIG. 3, these are structures in which three H-shaped steels of the same length are arranged with their respective webs aligned horizontally in the vertical direction, and these are connected to each other using a known connector or the like. It is said that . The size and number of the H-shaped steels to be connected can be appropriately set using a predetermined safety factor in consideration of the mass of the wave-dissipating block 10 loaded on the transportation platform.

  Further, the length of the supporting aggregates R1 and R2 is set to be larger than the width of the loading platform 31 of the trailer 30 on which the transport platform 12 is to be placed. Specifically, the total length of each of the supporting aggregates R1 and R2 is preferably set to be about 1 to 2 m longer than the width of the loading platform 31 of the trailer 30. By setting such a length, as will be described later, both ends of each of the supporting aggregates R1 and R2 are securely supported at the top of the adjacent fixed cradle, and each of the supporting aggregates is supported. R1 and R2 can bridge between the tops of the fixed cradle.

  Further, as shown in FIGS. 2 and 3, the transport frame 12 is a scaffold plate material provided so as to close a substantially rectangular opening surrounded by a skeleton structure composed of supporting aggregates R <b> 1 and R <b> 2 and vertical members 13 and 13. 121, and scaffolding plates 122 and 123 provided on brackets 125 and 126, respectively, in the direction perpendicular to the outer surfaces of the supporting aggregates R1 and R2 over the entire length. Each of the brackets 125 and 126 is composed of a horizontal material that supports the back surfaces of the scaffold plates 122 and 123 in parallel to the width direction thereof, and an oblique material that is fixed at one end to hold the horizontal material substantially horizontally. Has been. The brackets 125 and 126 can be provided at both ends in the arrangement direction of the supporting aggregates R1 and R2 of the scaffold plates 122 and 123, respectively, and in an intermediate region as necessary. By appropriately setting the size of the horizontal members of the brackets 125 and 126 together with the total length of the supporting aggregates R1 and R2, the wave-dissipating block is applied not only to the both ends in the length direction of the scaffold plate 121 but also to the scaffold plates 122 and 123. It is possible to fulfill the function of a worker's walkway around the area 10. In addition, it replaces with this bracket and other well-known support metal fittings can also be used.

Handrails 14 and 14 that can stand upright vertically are provided at the outer ends of the scaffold plates 122 and 123 in the longitudinal direction. The handrail 14 is pivotally supported at its base, and is rotated from the vertically standing state to a horizontal state outside the direction perpendicular to the direction in which the supporting aggregates R1 and R2 are disposed. Be able to.

  The trailer 30 is suitable for transporting the wave-dissipating block 10, has a width and length that are large enough to load the block 10, and includes a loading platform 31 that can move up and down by a predetermined distance in the entire vertical direction. Yes. A known mechanism can be adopted for the lifting operation of the loading platform 31. There are no particular restrictions on the shape and structure of the trailer vehicle body or the driver's seat, excluding the loading platform 31 and its lifting mechanism. Moreover, if a heavy article can be conveyed and the loading platform is configured to be able to move up and down, it is not limited to a trailer, and other conveying vehicles can be used.

  As shown in FIG. 3, a plurality of fixed cradles (40, 46) adjacent to each other in an arbitrary direction are paired with each other and arranged at predetermined intervals on the loading / unloading place. The distance between the adjacent fixed cradle is slightly larger than the width of the trailer 30 so that at least a part of the cargo bed can enter between them, and the carriage 12 overhangs on both sides of the trailer in the width direction on the cargo bed. The two end portions are appropriately set within a range where they can be directly received and supported by the top portions. Here, the fixed cradle 40 is disposed at both ends of the array, and the end portions of the supporting aggregates R1 and R2 projecting in the same direction from the side of the transport cradle 12 have a width substantially equal to the width thereof. And it is comprised so that it may mount and support in the top part which has the area | region of the length substantially equivalent to the length projected from these loading platforms 31 (refer FIG. 3 and FIG. 4). Further, the fixed cradle 46 is disposed at a position excluding both ends of the arrangement, and the oppositely projecting end portions of the two transport cradles 12 and 12 from both sides have a width substantially equal to the width thereof, and these loading platforms 31. Are mounted and supported by the tops each having a region having a length approximately equal to the length of the protrusion (the area of the latter is set to approximately twice that of the former). The fixed cradle 40, 46 enables the transport gantry 12 to be supported in a bridged state.

  Each of the fixed cradle 40, 46 can take various structures without particular limitation as long as it can withstand the load of the transport gantry loaded with heavy objects and the top is located at a predetermined height. 3 and FIG. 4, a plurality of H-shaped steels of the same size as the H-shaped steels constituting the supporting aggregates (R1, R2) are cut into a predetermined length, and three of these cut pieces are aligned. It is formed by stacking connected bodies (41 to 45; 47 to 51) arranged side by side so that their directions are alternately perpendicular. The stacking height is the moving height of the upper surface of the loading platform 31 when the loading platform 31 of the trailer 30 is moved up and down (in other words, the moving height of the lower end surface of the transport platform 12 mounted thereon). It can set suitably within the range. Further, the length of the fixed cradle 40, 46 in the direction in which the trailer 30 enters can be set as appropriate. For example, one end of each of the supporting aggregates R1, R2 of the transport cradle 12 that protrudes from the cargo bed 31 in the width direction is individually provided. May be supported by the fixed support base 40 (or 46), or may be supported by one fixed support base 40 (or 46).

Next, it is assumed that a number of wave-dissipating blocks manufactured at the wave-dissipating block production plant are temporarily placed in the loading place (temporary storage area) that is the first cargo handling place, and this wave-dissipating block is unloaded as the second cargo handling place. Taking the case of transporting to the ground (unloading place) as an example, the method for transporting heavy objects of the present invention will be described. First, the supporting aggregates R1 and R2 face the loading platform 31 of the wave-dissipating block transport trailer 30 in the width direction, and both ends of the aggregates R1 and R2 are the same from both sides of the loading platform 31. The transportation platform 12 is placed so as to overhang by a certain length. At this time, if necessary, as the transport frame 12 is not deviated on the loading platform 31 during movement of the trailer, it is kept still the loading platform 31 and the transport frame 12 by using a known fastener it can.

  In this way, the trailer 30 on which the transport platform 12 is placed (fixed) on the loading platform 31 is moved to the temporary storage place (loading place) of the wave-dissipating block 10, and the wave-dissipating block 10 is attached to the transport platform 12 using a large crane. Load on top. At this time, if necessary, the wave-dissipating block 10 may be fixed on the transportation platform 12 using a known fixture or the like. Thereafter, the trailer 30 loaded with the wave-dissipating block 10 is loaded and unloaded.

  In the loading / unloading place, it is confirmed that the carriage 12 is not placed between a pair of adjacent fixed cradles 40 and 46 or 46 and 46 in the row of the fixed cradles 40, 46, 46,. After confirming, the trailer 30 is moved forward or backward to enter the fixed cradle 40, 46 (or 46, 46) that is not placed, with the cargo bed 31 raised. At this time, when a fixture is used to fix the transportation platform 12 and the load 31, the fixture is removed and the loading platform 31 and the transportation platform 12 are unlocked. This fixing tool can be removed before entering the row of the fixed support bases 40 and 46 in advance. When both ends in the length direction of the support aggregates R1 and R2 in the transport platform 12 are located above the fixed supports 40 and 46, the loading platform 31 of the trailer 30 is lowered, and both ends of the support aggregates R1 and R2 are moved. Receiving directly at the top of each fixed cradle 40 or 46, the transport cradle 12 is supported in a bridged state between the tops. The loading platform 31 is further lowered so that a gap is generated between the upper surface of the loading platform 31 and the lower surface of the transportation platform 12 mounted and supported on the fixed cradle 40 or 46. To leave. Thereby, the conveyance stand 12 is supported in the bridge | crosslinking state between the top parts of the adjacent fixed stand, and it becomes possible to store in that state.

  The trailer 30 that has exited between the pair of fixed cradles 40 and 46 (or 46 and 46), if necessary according to the construction plan, again places the transport cradle 12 on the carrier 31 and needs this. Accordingly, it is possible to move to the loading place in a fixed state and repeat the transportation method.

  As described above, by using the transport system and transport method of the present invention, a heavy object is loaded onto a trailer using a crane at the loading site, and the handling work using the crane is omitted at the unloading site where the trailer is transported. As a result, the cost associated with the crane and the placement of slinging workers are not required, and the economy is improved, and the loading and unloading operations with a crane that requires a long time can be halved, resulting in improved efficiency of carrying the wave-dissipating block. It is done.

  In the embodiment described above, the fixed cradle is installed at the loading / unloading place in the two loading / unloading places where the transport vehicle reciprocates. For example, the fixed cradle is installed at the loading place, and the method opposite to the above method is used. It is also possible to carry heavy objects with. In this case, a transport platform loaded with heavy objects is placed in a bridged state on the adjacent fixed stand, and a trailer with the load platform lowered is inserted between the adjacent fixed stands. The loading platform is lifted, and while the transport platform is supported in a state of being lifted from the fixed suspension platform, the loading platform is unloaded by appropriately adjusting the height of the loading platform, for example, by lowering the loading platform. It will be transported to.

It is a figure explaining the conveyance method of a wave-dissipating block as an example of the conveyance method of the heavy article of this invention. It is a figure which shows the loading state of the wave-dissipating block on the loading platform of the trailer of (b) in FIG. FIG. 2 is an enlarged view of (c-1) and (c-2) in FIG. 1. It is the figure which looked at the wave-dissipating block and conveyance stand on the fixed stand of FIG. 3 from the left side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wave-dissipating block 12 Carriage stand 121,122,123 Scaffold board | plate material 13 Vertical member 14 End part handrail 15 Stairway 30 with a handrail Trailer 31 Cargo bed (movable up and down)
40, 46 Fixed cradle R1, R2 Support aggregate

Claims (2)

A transport vehicle equipped with a platform that can be moved up and down, a vehicle mounted on the platform in a state of projecting on both sides in the width direction, a wave-dissipating block can be loaded as a heavy object, and a vertically installed state A handrail capable of rotating between a horizontal state and a transport stand provided opposite to both ends in the longitudinal direction of the transport vehicle, and disposed at an interval at which the transport vehicle can enter a cargo handling area, In the meantime, when the transport vehicle that has moved up to a predetermined position with the loading platform raised is lowered the loading platform, at least one pair that receives both ends of the transportation platform at the top and supports the transportation platform in a bridged state. A heavy material transport system comprising: a fixed cradle. In the first cargo handling place, it is possible to rotate between a state of being vertically installed on both ends of the transport vehicle in the longitudinal direction and a horizontal state on the transport platform of the transport vehicle having a lift platform capable of moving up and down. The carrier frame provided with the handrails is placed so as to protrude from both sides in the width direction of the carrier vehicle, and after the wave-dissipating block is loaded thereon as a heavy object, the carrier vehicle is carried to the second loading place by the carrier vehicle. The transport vehicle that has entered the predetermined position with the load platform raised between a pair of fixed cradles spaced apart by a distance slightly larger than the width of the load platform of the transport vehicle lowers the load platform, A heavy article transporting method characterized in that both ends of the transport stand in a state where the handrail stands vertically are received at the top of the fixed stand, and the transport stand is supported and stored in a bridged state. .

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