JP2004115179A - Mobile unit crane, and bridge erection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a means for continuously performing unloading and erection. <P>SOLUTION: This mobile unit crane 20 comprises four or more self-traveling wheels 21; a vehicle body 22 supported on the self-traveling wheels 21; an accommodation space 23 installed in the vehicle body 22 and opened downward; several crane devices 24 hoisting and supporting a bridging member 100 in the accommodation space 23; and a control device for individually adjusting length of each wire 24c of the crane devices 24. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a self-propelled unit crane and a bridge erection method using the same.
[0002]
[Prior art]
An example of a conventional bridge erection method using a crane will be described with reference to FIGS.
First, it is discussed whether a wide yard width can be secured at the construction site, and if it is possible, the construction method shown in FIG. 10 is adopted. That is, after securing a work place with a wide yard width in the bridge erection place, the crane 1 is previously installed here. In the figure, reference numeral 2 denotes a bridge that has already been installed, reference numeral 3 denotes an equipment yard for temporarily storing vent equipment and the like, and reference numeral 4 denotes a place where the bridge member is unloaded.
[0003]
The bridge member 6 is carried into the vicinity of the crane 1 by the transport truck 5. Then, the crane 1 lifts the bridge member 6 mounted on the carrier of the transport truck 5, turns the bridge member 6 in the horizontal direction, and further lowers the bridge member 6 at the unloading place 4 to collect the cargo.
At the unloading place 4, the ground structure of each bridge member 6 and the attachment of scaffolds to these bridge members 6 are performed. The bridge member 6 assembled in this manner is lifted by the crane 1 again, turned horizontally in the same direction, and conveyed to the end of the bridge 2 that has been installed (a regular installation place). (The state such as relative height and levelness with respect to the bridge 2) is secured, and then connected to the end of the bridge 2. By repeating the above steps, the bridge can be erected with one crane 1.
[0004]
On the other hand, if a wide yard width cannot be secured at the construction site and the construction site is far from the loading location, the construction method shown in FIG. 11 is adopted. That is, a crane 7A for unloading and a crane 7B for assembling bridge members are installed in advance at the bridge erection site, and the movable trolley 8 is carried in. In addition, the code | symbol 9 in the same figure shows the bridge which has already been installed, and the code | symbol 10 has shown the general road.
[0005]
In such a narrow construction site, the bridge member 12 is carried into the vicinity of the crane 7A by the transport truck 11. Then, the crane 7A lifts the bridge member 12 mounted on the carrier of the transport truck 11, and then retracts the transport truck 11. Thereafter, the movable cart 8 is carried in just below the suspended bridge member 12, and is placed on the carrier to complete the unloading. At this time, the terrain is performed on the movable trolley 8 as needed.
After the wire of the crane 7A is cut off, the bridge member 12 is transported to the erection site by the movable carriage 8. At the erection site, the bridge member 12 is lifted using the crane 7 </ b> B, and the bridge member 12 is connected to the end of the bridge 9 after securing its assembled state (the state of relative height and levelness with respect to the bridge 9). By repeating the above steps, the bridge can be erected by the two cranes 7A and 7B.
[0006]
Similarly, means for efficiently constructing and disassembling a bridge at a limited construction site is disclosed in Patent Document 1 below. That is, in the construction of the bridge in this Patent Document 1, a T-shaped bridge member composed of a column top and a beam is temporarily placed along the longitudinal direction of the erection site, and is lifted up to be positioned below the column intermediate. A method of erection of rotating the T-shaped bridge member at right angles about a vertical axis after fitting the parts is disclosed.
[0007]
[Patent Document 1]
JP-A-8-296210 (page 4, FIG. 1 to FIG. 2)
[0008]
[Problems to be solved by the invention]
By the way, in any of the method described in FIG. 11 and the method disclosed in Patent Document 1, in a narrow construction site where the work range is limited, it is assumed that the construction site is far from the loading place. However, the following problem occurs.
That is,
1) At a construction site with a wide yard width, one crane 1 was used to carry out the loading, holding, and erection, but at least the crane 7A for loading, the movable carriage 8, and the crane for the construction. Three types of heavy equipment such as 7B are required.
2) Since the three types of heavy equipment, ie, the crane 7A for loading, the movable trolley 8, and the crane 7B for erection, are used properly, the work of transferring the bridge member 12 is required. It becomes discontinuous and the work efficiency is poor. Accordingly, it is difficult to reduce the operation time, and the operation process is lengthened.
3) Since a plurality of types of heavy equipment are used and their operators are required, the work cost is likely to increase.
4) As shown in FIGS. 12 (a) and 12 (b), if the center of gravity of the bridge member 12 is deviated, the bridge member 12 is tilted when being lifted by the cranes 7A and 7B. Extra work of adjusting the length of each of them occurs. Such extra work is a factor that impairs the continuity of the work flow.
5) As shown in FIGS. 13 (a) and 13 (b), when the shape of the bridge member 12 is complicated (for example, an arch shape), the support base 14 is fitted in accordance with the shape so that the bridge member 12 is mounted on the movable carriage 8. The extra work of preparing / installing is required. Such extra work is a factor that impairs the continuity of the work flow. In addition, since the position of the center of gravity at the time of transportation tends to be high, when traveling on an inclined surface as shown in FIG.
6) In general truck cranes and the like, the outriggers are extended to prevent the vehicle from tipping over in the lateral direction. Therefore, the crane installation portion requires a large yard, so that traffic control is required, which hinders the traffic of general vehicles.
That is the problem.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide means capable of continuously performing from loading to erection.
[0010]
[Means for Solving the Problems]
The present invention employs the following means in order to solve the above problems.
That is, the self-propelled unit crane according to claim 1 includes a plurality of self-propelled traveling wheels, a vehicle body supported on the self-propelled traveling wheels, and a vehicle body provided in the vehicle body and opened downward. Provided storage space, a plurality of crane devices capable of suspending and supporting members in the storage space and capable of moving in all directions on a horizontal plane, and a control device for individually adjusting the wire length of these crane devices. Features.
According to the self-propelled unit crane of the first aspect, the vehicle body is moved by each self-propelled traveling wheel so that the accommodation space is located right above the member to be assembled. In this state, the wire from each crane device is fixed to a member and lifted, thereby completing the loading operation. Subsequently, the transport operation is completed by transporting the members to the construction site in the suspended load state. Subsequently, by adjusting the length of each wire, the assembling state of the suspended member is ensured, and the assembling work is completed by assembling the suspended member at the assembling position as it is. In this way, it is possible to continuously perform from loading to erection without transferring members.
[0011]
The self-propelled unit crane according to claim 2 is the self-propelled unit crane according to claim 1, wherein each of the self-propelled traveling wheels can change a traveling direction around a vertical axis with respect to the vehicle body. It is characterized by the following.
According to the self-propelled unit crane according to the second aspect, by turning each self-propelled running wheel around a vertical axis, the vehicle can move in any horizontal direction without changing the direction of the vehicle body. Can be.
[0012]
The self-propelled unit crane according to claim 3 is the self-propelled unit crane according to claim 1 or 2, wherein each of the self-propelled traveling wheels is adjusted in height in a vertical axis direction with respect to the vehicle body. It is characterized by being possible.
According to the self-propelled unit crane according to the third aspect, by performing the height adjustment by the height adjustment mechanism, it is possible to use the crane in a place with a large inclination.
[0013]
A self-propelled unit crane according to a fourth aspect is the self-propelled unit crane according to any one of the first to third aspects, wherein the vehicle body is erected on each of the self-propelled traveling wheels, and the housing is provided. It is characterized by having a leg portion arranged to cover the periphery of the space.
According to the self-propelled unit crane according to the fourth aspect, even if a member that is a suspended load falls, each leg prevents the member that has fallen out of the accommodation space from rolling.
[0014]
A self-propelled unit crane according to claim 5 is the self-propelled unit crane according to any one of claims 1 to 4, wherein the self-propelled unit crane is provided in at least a part of a periphery of the housing space and in the housing space. It is characterized in that a wind shield for blocking the blowing wind is provided.
According to the self-propelled unit crane according to the fifth aspect, even when a strong wind blows on a member which is particularly easily shaken by the wind, is lightweight and has a large pressure receiving area, the strong wind is directed toward the member. It can be prevented by blocking. In addition, wind shields are not usually installed, but are installed when wind shields are required due to suspended loads or construction conditions.
[0015]
The self-propelled unit crane according to claim 6 is the self-propelled unit crane according to any one of claims 1 to 5, and allows the other storage cranes to communicate with each other in the accommodation space. It is characterized by having a connection mechanism for connecting in a state where the connection is made.
According to the self-propelled unit crane according to the sixth aspect, a large-sized self-propelled unit crane including a long accommodation space can be configured by connecting a plurality of units by the connection mechanism.
[0016]
The self-propelled unit crane according to claim 7 is the self-propelled unit crane according to claim 6, wherein the connection mechanism connects the other self-propelled unit crane to each other so as to be bendable. It is characterized by the following.
According to the self-propelled unit crane according to the seventh aspect, by bending between the self-propelled unit cranes in the connecting mechanism, it is possible to deform the entire shape suitable for bending a curve.
[0017]
The self-propelled unit crane according to claim 8 is the self-propelled unit crane according to any one of claims 1 to 7, wherein the vehicle body is one of a height direction, a width direction, and a length direction. It is characterized in that at least one of the members expands and contracts and the body size is adjustable.
According to the self-propelled unit crane according to the eighth aspect, by increasing the size of the vehicle body, a relatively large member can be suspended and held. In addition, by reducing the size of the vehicle body, it is possible to reduce the size to a size suitable for storage and transportation.
[0018]
According to a ninth aspect of the present invention, there is provided a bridge erection method using a self-propelled unit crane, wherein the self-propelled unit crane according to any one of the first to eighth aspects loads the member and removes the member. It is characterized in that the transfer and the installation for holding the member in the installed state are continuously performed.
According to the bridge erection method using the self-propelled unit crane according to the ninth aspect, the vehicle body is moved by each self-propelled traveling wheel so that the accommodation space is located right above the member to be assembled. In this state, the wire from each crane device is fixed to a member and lifted, thereby completing the loading operation. Subsequently, the transport operation is completed by transporting the members to the construction site in the suspended load state. Subsequently, by adjusting the length of each wire, the assembling state of the suspended member is ensured, and the assembling work is completed by assembling the suspended member at the assembling position. In this way, it is possible to continuously perform from loading to erection without transferring members.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of a self-propelled unit crane of the present invention and a bridge erection method using the same will be described below with reference to the drawings, but it is needless to say that the present invention is not limited to these embodiments. .
[0020]
First, a first embodiment of the present invention will be described below with reference to FIGS.
As shown in FIGS. 1 and 2, the self-propelled unit crane 20 of the present embodiment includes, for example, four self-propelled traveling wheels 21, a vehicle body 22 supported on these self-propelled traveling wheels 21, A housing space 23 provided in the vehicle body 22 and opened downward, for example, four crane devices 24 for suspending and supporting the bridge member 100 in the housing space 23, And a control device (not shown) for individually adjusting each wire length.
[0021]
The vehicle body 22 is vertically erected on each of the self-propelled traveling wheels 21, and is supported on the four legs 22 a, which are disposed so as to cover four sides of the accommodation space 23, It is provided with a square frame-shaped crane support portion 22b having the control device and the operator's cab.
[0022]
The spacing between the legs 22a is longer in the normal running direction (the left-right direction on the paper surface of FIG. 1) than in the direction perpendicular to the running direction (the left-right direction on the paper surface of FIG. 2). Even such a long bridge member 100 can be stably held horizontally.
In addition, the vehicle body 22 includes a reinforcing portion 22c for horizontally connecting and reinforcing the legs 22a on both sides parallel to the traveling direction around the accommodation space 23, and a wind blowing into the accommodation space 23. A windproof screen 22d (wind shield) that blocks the wind is fixed. In this embodiment, since the bridge member 100 to be suspended is long in the traveling direction, the windproof screens 22d are provided only on both sides parallel to the traveling direction. However, the present invention is not limited to this. In the case of lowering, a windscreen may be provided before and after in the traveling direction.
[0023]
Each self-propelled traveling wheel 21 is a multi-wheel drive type having a traveling drive mechanism, and is capable of self-propelled. In addition, these self-propelled traveling wheels 21 can change the traveling direction relative to the vehicle body 22 in a 360 ° direction around a vertical axis. Thereby, by turning the direction of each self-propelled traveling wheel 21 around the vertical axis in the same direction, it is possible to move in any horizontal direction without changing the direction of the vehicle body 22. That is, in addition to traveling in the left-right direction on the sheet of FIG. 1, traveling in the direction perpendicular to the sheet of FIG. In addition, horizontality can be maintained by adjusting the height also in the vertical axis direction.
[0024]
As shown in FIG. 3, the crane support portion 22b has a pair of fixed rails 24a installed so as to be horizontal in the running direction, and runs on the fixed rails 24a along the extending direction. A pair of traveling rails 24b that are supported so as to be supported and an auxiliary winch 24e (not shown in FIG. 3 and described later in FIG. 4) that can travel along the extending direction of the fixed rail 24a are also provided. . Each of the traveling rails 24b supports two of the crane devices 24 (four in total) so as to be able to travel along the extending direction of each traveling rail 24b (perpendicular to the fixed rail 24a). .
A wire 24c is suspended from each of the crane devices 24. By connecting the lower ends of the wires 24c to the bridge member 100, the suspension can be supported. For example, in the case of the same figure, by making all the wires 24c the same length, the bridge member 100 is supported at four points so as to be horizontal.
[0025]
In addition, it is not limited to such horizontal holding, and for example, as shown in FIG. 4, vertical holding is also possible. That is, first, from the state where the lengths of all the wires 24c are the same (the first state from the left in the drawing), in the traveling direction, the wires 24c of each of the winches 24 are extended, and at the same time, the other winches 24 are simultaneously extended. The wire 24c is wound up, and the distance between the one and the other winches 24 is further reduced (the second state from the left in the drawing). As a result, the bridge member 100 is gradually inclined, and finally comes into a nearly vertical state (the third state from the left in the drawing). Here, the lower end of the auxiliary wire 24e from the auxiliary winch 24e is connected to the upper end of the bridge member 100. Finally, by removing each wire 24c from the bridge member 100, the vertical holding of the bridge member 100 is completed (the fourth state from the left in the drawing).
[0026]
A bridge erection method using the self-propelled unit crane 20 of the present embodiment having the configuration described above will be described below. Here, in the case where a wide yard width cannot be secured at the construction site, and the construction site is separated from the loading place, and the arched bridge member 100 is transported while passing through a road having an inclined surface. Will be described.
[0027]
First, the self-propelled unit crane 20 is carried into the loading place, and is arranged so that the accommodation space 23 is located above the bridge member 100 to be erected. Then, each winch 24 is moved such that the position of each winch 24 when viewed in a plan view matches the joint position of the bridge member 100. Thereafter, the wires 24c are extended from the respective winches 24, and the lower ends thereof are connected to the corresponding joints. Then, by winding up each wire 24c, the bridge member 100 is lifted up in a horizontal state, and is suspended and held in the accommodation space 100, whereby the loading operation is completed. This state is shown in FIG. In the figure, the windproof screen 22d for explanation is not shown.
[0028]
At this time, even if the position of the center of gravity of the bridge member 100 to be suspended is deviated, the bridge member 100 is supported at four points by using the four wires 24c, so that a large inclination of the bridge member 100 can be prevented. Therefore, unnecessary work of adjusting each length of each wire as described with reference to FIGS. 12A and 12B in the related art does not need to be performed, and the continuity of the work flow is impaired. There is no.
Similarly, since the self-propelled unit crane 20 of the present embodiment simply suspends the bridge member 100 with four wires 24c, it will be described with reference to FIGS. 13A and 13B in the related art. An unnecessary operation of preparing / installing a large number of support frames 14 as described above is not required, and the continuity of the operation flow is not impaired.
[0029]
In the subsequent transporting operation, the self-propelled unit crane 20 is caused to travel to an erection location away from the loading location while the bridge member 100 is suspended inside. At this time, since the position of the center of gravity of the bridge member 100 at the time of transportation can be made lower than before, the height of the center of gravity of the self-propelled unit crane 20 can be approached, and as shown in FIG. It is possible to prevent a fall when traveling on an inclined surface. In addition, when the inclination is large, it can be adjusted by the height of the running wheels.
Even if there are some obstacles on the running surface, a collision can be avoided without detouring by slightly raising the lifting height of the bridge member 100.
[0030]
After arriving at the erection site, it will proceed to erection work. That is, by individually adjusting the length of each wire 24c, the installation state of the bridge member 100 to be erected from now on (the state of relative height and levelness with respect to the already assembled bridge) is secured. Then, in the suspended state, the bridge member 100 is connected to the existing portion, and then each wire 24c is separated from each joint of the bridge member 100, thereby completing the erection work.
As described above, the unloading operation, the transport operation, and the installation operation of the bridge member 100 are performed continuously. Then, by repeating this series of operations, the construction of the bridge is completed.
[0031]
According to the self-propelled unit crane 20 of the present embodiment having the above-described configuration, it is not necessary to transfer the bridge member 100 in each operation, so that it is possible to continuously perform from loading to erection. It becomes. As a result, it is possible to achieve all of shortening of work time, improvement of workability, reduction of work cost, improvement of safety, and reduction of required work yard area.
In addition, the self-propelled unit crane 20 of the present embodiment can move in any horizontal direction without changing direction because each self-propelled traveling wheel 21 can change the running direction, and can be installed in a narrow installation place. Can be entered and withdrawn from narrow erection sites. Further, fine adjustment of the position when the bridge member 100 is erected is also possible.
[0032]
Further, the self-propelled unit crane 20 of the present embodiment employs a configuration in which the vehicle body 22 includes several (tentatively four in this drawing) legs 22a that cover the periphery of the accommodation space 23. According to this configuration, it is possible to enhance the safety around the self-propelled unit crane 20 due to the drop of the bridge member 100 as a suspended load. As a result, even if there is a general road near the construction site, it is possible to reduce anxiety given to a vehicle traveling on the general road.
Further, since the self-propelled unit crane 20 of the present embodiment is provided with the windproof screens 22d on both sides of the accommodation space 23, it is possible to prevent the bridge member 100 from swaying due to strong wind, and further secure safety. It is possible.
[0033]
A second embodiment of the self-propelled unit crane according to the present invention will be described below with reference to FIGS. The self-propelled unit crane of the present embodiment has a vehicle body (hereinafter, described with a new reference numeral 32 to distinguish it from the vehicle body 22 of the self-propelled unit crane 20 of the first embodiment). Since the present embodiment is different from the first embodiment, the description will be made focusing on this difference, and the other parts will be the same as those of the first embodiment and will not be described.
[0034]
As shown in FIG. 6, the vehicle body 32 of the present embodiment has four legs, each of which is vertically erected on each of the self-propelled traveling wheels 21 and is disposed so as to cover four sides of the accommodation space 23. 32a, and a rectangular frame-shaped crane support portion 32b supported on the legs 32a and having the control device, the operator's cab, and the like. The body 32 expands and contracts in all of the height direction, width direction, and length direction, so that the body size can be adjusted.
That is, in the vehicle body 32, each leg portion 32a can be separated at an intermediate position in the length direction, and can be extended by connecting the length adjustment member 32a1 so as to sandwich it. ing. Similarly, the crane support portion 32b can also be cut off at an intermediate position in the width direction and the length direction, and can be extended by connecting the length adjustment member 32b1 so as to sandwich it. I have.
[0035]
FIG. 7 shows an example of a connection structure of the length adjustment member 32a1 in each leg portion 32a and a connection structure of the length adjustment member 32b1 in the crane support portion 32b. As shown in the figure, the length adjusting members 32a1 and 32b1 are provided at both ends thereof with a hollow box-shaped inner joint 33a, an outer joint 33b, and a plurality of fastening bolts 33c. The inner joint 33a has a joint insertion opening 33d formed at an end on the side of the length adjusting members 32a1 and 32b1, and a joint insertion opening 33d formed at an end of a divided portion on each leg 32a and the crane support 32b. Both sides can be slid and inserted by half the length. In addition, the outer joint 33b is capable of slidably inserting both ends of the length adjusting members 32a1 and 32b1 and the ends of the legs 32a and the crane support 32b by half the length. Has become.
[0036]
Therefore, after the ends of the length adjusting members 32a1 and 32b1 are connected to the ends of the legs 32a and the divided portions on the side of the crane support 32b by the inner joint 33a and the outer joint 33b, further fastening is performed. The connection between the two is completed by fastening with the bolt 33c.
The configuration for expanding the legs 32a and the crane support 32b is not limited to the configuration described above, and for example, the configurations shown in FIGS. 8A and 8B can be adopted. In the example shown in the figure, an extension joint 34 is built in each of the divided ends of each leg 32a and the crane support 32b, and extends from the contracted state in FIG. 8A to the extended state in FIG. 8B. It is possible to make it. This expansion / contraction operation can be performed by an expansion / contraction drive mechanism (not shown) such as a hydraulic pressure or a jack.
[0037]
According to the self-propelled unit crane of the present embodiment described above, by increasing the size of the vehicle body 32, a relatively large bridge member can be suspended and held. Further, by reducing the size of the vehicle body 32, the vehicle body 32 can be downsized to a size suitable for disassembly, storage, and transportation.
Accordingly, it is possible to cope with a wide range of bridge members from relatively small bridge members to large bridge members. Further, by reducing the size of the vehicle body 32, the self-propelled unit crane can be reduced in size to a size suitable for storage and transportation.
[0038]
A third embodiment of the self-propelled unit crane of the present invention will be described below with reference to FIG. The self-propelled unit crane of the present embodiment (hereinafter, described with a new reference numeral 42 to distinguish it from the self-propelled unit crane 20 of the first embodiment) will be described by connecting a plurality of units. Since the point of use is different from that of the first embodiment, the description will be made focusing on this difference, and the description of the other points will be omitted because they are the same as those of the first embodiment.
[0039]
As shown in FIG. 9, the self-propelled unit crane 42 of the present embodiment includes a connection mechanism 43 that is connected to another self-propelled unit crane 42 </ b> A in a state where the accommodation spaces 23 communicate with each other. In addition, the connection mechanism 43 can also be connected to another self-propelled unit crane 42A so as to be bendable.
[0040]
According to the self-propelled unit crane 42, a plurality of (two in the example of FIG. 9) are connected by the connecting mechanism 43 to form a large self-propelled unit crane including a long accommodation space. be able to. Therefore, even with a long bridge member 100A that cannot be lifted by one self-propelled unit crane, it is possible to continuously carry out from loading to erection by connecting the required number of units continuously. Become.
Further, according to the self-propelled unit crane 42 of the present embodiment, by bending the self-propelled unit cranes 42 and 42A in the coupling mechanism 43, it is possible to deform the entire shape suitable for bending a curve. it can. Therefore, it is possible to bend a curve with a smaller radius of curvature as compared with a case where the self-propelled unit cranes 42 and 42A are connected and fixed in a straight line.
[0041]
【The invention's effect】
The self-propelled unit crane according to claim 1 of the present invention individually adjusts a plurality of self-propelled traveling wheels, a vehicle body, a housing space, a plurality of crane devices, and wire lengths of these crane devices. A configuration including a control device is employed. According to this configuration, the work of transferring the members is not required, so that it is possible to continuously perform the operations from the loading to the erection. As a result, it is possible to achieve all of shortening of work time, improvement of workability, reduction of work cost, improvement of safety, and reduction of required work yard area.
[0042]
Further, the self-propelled unit crane according to claim 2 employs a configuration in which each self-propelled traveling wheel can change the traveling direction. According to this configuration, since it is possible to move in any horizontal direction without changing the direction, it is possible to enter a narrow installation place and withdraw from a narrow installation place. Moreover, fine adjustment of the position when the member is erected is also possible.
[0043]
The self-propelled unit crane according to claim 3 employs a configuration in which each self-propelled traveling wheel is adjustable in height in a vertical axis direction. According to this configuration, by performing the height adjustment by the height adjustment mechanism, it is possible to use the device in a place with a large inclination.
[0044]
In addition, the self-propelled unit crane according to claim 4 has a configuration in which the vehicle body has legs that cover the periphery of the accommodation space. According to this configuration, it is possible to enhance the safety around the self-propelled unit crane when the member that is the suspended load falls. As a result, even if there is a general road near the construction site, it is also possible to reduce the feeling of anxiety given to a traveling vehicle traveling on the general road.
[0045]
In addition, the self-propelled unit crane according to claim 5 employs a configuration in which a wind shield is provided at least partially around the accommodation space. According to this configuration, it is possible to prevent the swinging of the members at the time of lifting, such as a lightweight member having a large pressure receiving area, which is particularly easily shaken by the wind at the time of a strong wind, and it is possible to further secure safety.
[0046]
In addition, the self-propelled unit crane according to claim 6 employs a configuration including a connection mechanism that is connected to another self-propelled unit crane. According to this configuration, even from a long member that cannot be lifted by one self-propelled unit crane, it is possible to perform from loading to erection by continuously connecting the required number of members.
[0047]
In addition, the self-propelled unit crane according to claim 7 employs a configuration in which the connecting mechanism connects the self-propelled unit cranes to each other so as to be bendable. According to this configuration, it is possible to bend a curve with a small radius of curvature as compared with a case where each self-propelled unit crane is connected and fixed in a straight line.
[0048]
Further, the self-propelled unit crane according to claim 8 employs a configuration in which the vehicle body expands and contracts in at least one of a height direction, a width direction, and a length direction, and the body size is adjustable. . According to this configuration, (a) it is possible to support a wide range of members from relatively small members to large members. (B) By reducing the body size, the self-propelled unit crane can be reduced in size to a size suitable for storage and transportation.
[0049]
The bridge erection method using the self-propelled unit crane according to the ninth aspect of the present invention employs a method of continuously carrying out the unloading, transport, and installation of members. According to this method, it is possible to achieve all of shortening of work time, improvement of workability, reduction of work cost, improvement of safety, and reduction of required work yard area.
[Brief description of the drawings]
FIG. 1 is a side view showing a first embodiment of a self-propelled unit crane of the present invention.
FIG. 2 is a front view of the self-propelled unit crane.
FIG. 3 is a perspective view showing a crane device of the self-propelled unit crane.
FIG. 4 is an explanatory diagram illustrating a case where a columnar bridge member is erected using the self-propelled unit crane.
FIGS. 5A and 5B are diagrams showing a case where the self-propelled unit crane travels on a slope while suspending a bridge member, wherein FIG. 5A is a side view and FIG. 5B is a front view.
FIG. 6 is a view showing a second embodiment of the self-propelled unit crane of the present invention, and is a schematic perspective view for explaining an enlarged structure of a vehicle body.
FIG. 7 is a perspective view showing a main part of a vehicle body in the self-propelled unit crane.
FIG. 8 is a perspective view showing a modification of the main part of the self-propelled unit crane, where (a) shows a contracted state and (b) shows an extended state.
FIG. 9 is a plan view showing a third embodiment of the self-propelled unit crane of the present invention.
FIG. 10 is a view for explaining a conventional bridge erection method using a crane, and is a plan view in a case where a wide yard width can be secured.
FIG. 11 is a view for explaining another bridge erection method using a conventional crane, and is a plan view in a case where the yard width is small and the loading / unloading site is separated from the erection site.
12A and 12B are diagrams for explaining a method of adjusting the position of the center of gravity of a bridge member using a conventional crane, wherein FIG. 12A is a side view and FIG. 12B is a plan view.
13A and 13B are diagrams illustrating a case where a bridge member is transported while traveling on a slope by using a conventional movable cart, wherein FIG. 13A is a side view and FIG. 13B is a plan view.
[Explanation of symbols]
20, 42 ・ ・ ・ Self-propelled unit crane
21 ・ ・ ・ Self-propelled running wheel
22, 32 ... body
22a, 32a ... leg
22d: Windproof screen (wind shield)
23 ... accommodation space
24 ・ ・ ・ Crane device
24c ... wire
43 ・ ・ ・ Connection mechanism
100, 100A ... bridge member (member)

Claims (9)

A plurality of self-propelled traveling wheels, a vehicle body supported on the self-propelled traveling wheels, a housing space provided in the vehicle body and opened downward, and suspension of members in the housing space A self-propelled unit crane, comprising: a plurality of crane devices that support and move in all directions on a horizontal plane; and a control device that individually adjusts the wire length of the crane devices. The self-propelled unit crane according to claim 1,
The self-propelled unit crane, wherein each of the self-propelled traveling wheels can change a traveling direction about a vertical axis with respect to the vehicle body. The self-propelled unit crane according to claim 1 or 2,
A self-propelled unit crane, wherein the height of each of the self-propelled traveling wheels is adjustable in a vertical axis direction with respect to the vehicle body. The self-propelled unit crane according to any one of claims 1 to 3,
The self-propelled unit crane, wherein the vehicle body is provided with legs each standing on each of the self-propelled traveling wheels and disposed so as to cover a periphery of the accommodation space. The self-propelled unit crane according to any one of claims 1 to 4,
A self-propelled unit crane, characterized in that at least a part of a periphery of the housing space is provided with a wind shield for blocking wind blown into the housing space. The self-propelled unit crane according to any one of claims 1 to 5,
A self-propelled unit crane, comprising: a connecting mechanism for connecting the other self-propelled unit crane and the accommodation spaces of the other self-propelled unit cranes. The self-propelled unit crane according to claim 6,
The self-propelled unit crane, wherein the connection mechanism connects the other self-propelled unit crane to each other so as to be bendable. The self-propelled unit crane according to any one of claims 1 to 7,
The self-propelled unit crane, wherein the vehicle body expands and contracts in at least one of a height direction, a width direction, and a length direction, and the body size is adjustable. The self-propelled unit crane according to any one of claims 1 to 8, wherein the unloading of the member, the transport of the member, and the installation for holding the member in an installed state are continuously performed. A bridge erection method using a self-propelled unit crane.

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