JP6411970B2 - Method for dismantling and removing mobile work vehicle and mobile work vehicle - Google Patents

Description

  The present invention relates to a method for dismantling and removing a mobile work vehicle and a mobile work vehicle.

  Conventionally, as a technique in this field, for example, a method for removing a mobile work vehicle (wagen) described in Patent Document 1 below is known. This mobile work vehicle is used for the construction of a cable-stayed bridge. After the bridge girder is completed, it is retracted to the vicinity of the bridge pier and dismantled.

JP 63-125712 A

  After completion of the bridge girder, paving and parapets are often already constructed in the area between the mobile work vehicle and the pier. For this reason, in order to move the mobile work vehicle back to the pier, it is necessary to construct a mechanism in which the mobile work vehicle moves backward while avoiding paving and parapets. For example, in patent document 1, the support part which supports the scaffold under the bridge girder in the width direction both ends of a bridge girder is attached, a scaffold is supported by the wheel of a support part, and the said scaffold is retracted to the bridge pier vicinity. However, a series of operations for retracting such a mobile work vehicle is complicated. In the case of a bridge with a long span, it takes time to move the mobile work vehicle itself, and it is desirable to omit the step of moving the mobile work vehicle back to the vicinity of the bridge pier from the viewpoint of shortening the construction period.

  An object of the present invention is to provide a mobile work vehicle dismantling / removal method and a mobile work vehicle that eliminate the step of moving backward to the vicinity of the pier when the mobile work vehicle is dismantled.

  The dismantling / removal method of the mobile work vehicle according to the present invention is a dismantling / removal method of the mobile work vehicle used for the bridge girder overhang construction method, and the mobile work vehicle is movable on the bridge girder in the direction of the bridge axis. And a pair of suspension members extending downward from the movable pedestal portion and disposed on both sides with the bridge girder interposed therebetween, and extending below the bridge girder in a direction perpendicular to the bridge axis and supported by the pair of suspension members. A suspension structure that is supported by the movable pedestal, and divides the suspension structure into two parts, and each of the divided suspension structures is independently one by one. And a structure dividing step for suspending and supporting the movable pedestal portion, and a removing step for removing each part of the suspended structure from the moving pedestal portion after the structure dividing step.

  In the structure dividing step, the transverse beam is divided in the extending direction to form two divided transverse beams, and the divided transverse beams are suspended and supported by the movable pedestal portion one by one through each suspension member. Good.

  Further, in the structure dividing step, the connection between the cross beam and one of the suspension members may be released, and the cross beam may be suspended and supported by the movable pedestal portion via the other suspension member.

  In the dismantling / removal method for a mobile work vehicle according to the present invention, the mobile pedestal portion includes a plurality of wage frame arranged in a direction perpendicular to the bridge axis, and is supported by the plurality of wage frame and extends in a direction perpendicular to the bridge axis, and is suspended. An upper beam to which the material is attached, and after the removing step, an upper beam dividing step of dividing the upper beam in the extending direction may be further provided.

  The mobile work vehicle of the present invention is a mobile work vehicle used in a bridge girder overhang construction method, a movable pedestal portion movable in the bridge axis direction on the bridge girder, and a bridge girder extending downward from the movable pedestal portion. A pair of suspension members disposed on both sides of the bridge and a cross beam extending in a direction perpendicular to the bridge axis below the bridge girder and supported by the pair of suspension members and supported by the movable pedestal portion A suspension structure, a splitting mechanism that can split the horizontal beam in the extending direction, and a hinge portion that hinge-couples the hanging material and the horizontal beam so as to be relatively rotatable about the bridge axis direction.

  Further, the mobile work vehicle of the present invention is a mobile work vehicle used in a bridge girder overhang construction method, and a movable pedestal portion movable in the bridge axis direction on the bridge girder, and extending downward from the movable pedestal portion. A pair of suspension members arranged on both sides with the bridge girder in between, and a horizontal beam extending in the direction perpendicular to the bridge axis below the bridge girder and supported by the pair of suspension members, and supported by the movable pedestal A suspension structure, a hinge portion that hinge-couples one suspension member and the transverse beam so as to be relatively rotatable around the bridge axis direction, and a connection release mechanism that can release the connection between the other suspension member and the transverse beam, Is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the dismantling removal method of a mobile work vehicle and a mobile work vehicle which abbreviate | omit the reverse process to the pier vicinity at the time of the dismantling removal of a mobile work vehicle can be provided.

It is a side view which shows the mobile work vehicle and bridge to which the dismantling removal method of 1st Embodiment is applied. It is a front view which shows a mobile work vehicle and a bridge girder. It is a side view which shows the completed bridge girder and a mobile work vehicle. (A) is the side view which shows the hinge part vicinity, (b) is the front view. (A), (b) is a figure which shows a connection division | segmentation mechanism. (A), (b) is a figure which shows the procedure of the demolition removal method. (A), (b) is a figure which shows the procedure following FIG. It is a figure which shows the demolition removal method in 2nd Embodiment.

  Embodiments according to the present invention will be specifically described below with reference to the drawings. For convenience, the same reference numerals are given to substantially the same elements, and the description thereof may be omitted.

(First embodiment)
FIG. 1 is a side view showing the bridge 100 and the mobile work vehicle 1, and FIG. 2 is a front view thereof. The mobile work vehicle 1 is used in a method for extending a bridge girder 102 in a bridge 100. As shown in the figure, an XYZ orthogonal coordinate system is set with the X axis in the direction perpendicular to the bridge axis of the bridge 100, the Y axis in the bridge axis direction, and the Z axis in the vertical direction. X, Y, Z may be used. The mobile work vehicle 1 projects outward from the existing part of the bridge girder 102 with the planned construction position P side where the overhang construction is scheduled as the overhang direction. The mobile work vehicle 1 includes a movable pedestal 3 that can move in the bridge axis direction on the upper surface of the bridge girder 102, and a suspended structure 5 that is suspended and supported by the movable pedestal 3.

  A rail 103 extending in the Y direction is laid on the upper surface of the bridge girder 102, and the movable pedestal 3 can move on the rail 103 in the Y direction. The movable pedestal 3 includes a pair of left and right wage frames 7 arranged in the X direction, and two upper beams 9 that extend across the wage frame 7 and extend in the X direction. The wagen frame 7 has a substantially parallelogram shape in a side view, and is provided with a column that connects one apex constituting the obtuse angle of the parallelogram and the other apex. The two upper beams 9 extend in the X direction on the wage frame 7 and are arranged in the Y direction. Of the two upper beams 9, the movable pedestal portion is such that the rear upper beam 9 is positioned vertically above the existing portion of the bridge girder 102 and the front upper beam 9 is positioned vertically above the planned construction position P. 3 is arranged.

  The suspended structure 5 is provided in each of the two upper beams 9 in the front and rear. As shown in FIG. 2, the suspension structure 5 includes a pair of suspension members 13 a and 13 b that extend downward from both ends of the upper beam 9 and are arranged on both sides with the bridge girder 102 interposed therebetween, and a bridge girder 102. And a transverse beam 15 that extends in the X direction below and is supported by being suspended by a pair of suspension members 13a and 13b. As the suspension members 13a and 13b, for example, Gebinde can be adopted. The suspension members 13 a and 13 b are supported by the upper beam 9 via the center hole jack 18, and move up and down with respect to the upper beam 9 by driving the center hole jack 18. A plurality of vertical beams 17 extending in the Y direction are arranged in the X direction so as to be bridged on the two horizontal beams 15. The work scaffold 19 is constructed below the bridge girder 102 by the two horizontal beams 15 and the plurality of vertical beams 17. Further, between the work scaffold 19 and the bridge girder 102, a frame receiving beam 21 supported by the suspension members 13a and 13b is disposed.

  In such a mobile work vehicle 1, overhanging work is performed from the end of the column head 104 on the pier 101 toward the overhanging direction. In the present embodiment, the overhanging work is performed in stages in the opposite directions by the two mobile work vehicles 1 arranged on the column head 104. That is, the bridge girder 102 is extended in the overhang direction by performing a plurality of constructions in units of blocks for each overhang span length planned in advance.

  As shown in FIG. 1, in the overhang construction, the formwork is arranged on the formwork receiving beam 21 in a state where the mobile work vehicle 1 is fixed to the column head 104. At this time, the formwork is arranged at the planned construction position P corresponding to the overhang span length planned in advance. Subsequently, rebar and PC (Prestressed Concrete) steel materials are assembled and concrete is placed. When the concrete curing period ends, the PC steel is tensioned and the formwork is dismantled. Thereby, the first construction cycle in the construction plan is completed, and the bridge girder 102 is extended by a predetermined span length. In the next construction cycle, the rail 103 is first extended on the extended bridge girder 102. The mobile work vehicle 1 moves on the extended rail 103 and is fixed to the end of the extended bridge girder 102. Then, by repeating the construction cycle based on the construction plan, the bridge girder 102 is extended stepwise in accordance with the planned overhang span length.

  As shown in FIG. 3, a similar overhang construction is also performed from the pier 101B adjacent to the pier 101. And the overhang | projection part is joined between the bridge piers 101 and 101B, and the bridge girder 102 between the bridge piers 101 and 101B is completed.

  Next, a first embodiment of a method for dismantling and removing the mobile work vehicle 1 after the bridge girder 102 between the piers 101 and 101B is completed will be described.

  In order to enable the dismantling / removal method of the present embodiment, the mobile work vehicle 1 has the following configuration. That is, the suspension members 13 a and 13 b and the cross beam 15 are hinge-coupled at the hinge portion 23. In the hinge part 23, the suspension members 13a and 13b and the cross beam 15 are coupled in a state in which they can rotate relative to each other around an axis parallel to the Y direction. In the mobile work vehicle 1, the cross beam 15 is composed of two split cross beams 15a and 15b having the same length and detachably connected in the X direction. The divided transverse beams 15 a and the divided transverse beams 15 b are connected via a connecting and dividing mechanism 27. The horizontal beam 15 can be divided into two in the X direction at the center in the width direction of the bridge girder 102 from a state in which the cross beam 15 is suspended and supported by the two suspension members 13a and 13b. Further, the upper beam 9 is composed of two divided upper beams 9a and 9b having the same length that are detachably connected in the X direction, and can be divided into two in the X direction at the center of the bridge beam 102 in the width direction. It is. The divided upper beam 9 a and the divided upper beam 9 b are connected via a connecting and dividing mechanism 29.

  Here, an example of the hinge part 23 will be described. For example, as shown in FIGS. 4A and 4B, when the cross beam 15 is composed of two parallel H steels 15s, in the hinge portion 23, the suspension member 13b is interposed between the H steels 15s. The connecting portion 13j at the tip of the is sandwiched. The connecting portion 13j and the web of the H steel 16a are provided with pin holes penetrating in the Y direction, respectively, and the horizontal beam 15 and the suspension member are formed by one connecting pin 14 inserted through these pin holes in the Y direction. 13b is connected to each other, and the cross beam 15 and the suspension member 13b are rotatable about the connection pin 14 as an axis.

  An example of the connecting / dividing mechanism 27 will be described. As shown in FIGS. 5A and 5B, the connecting and dividing mechanism 27 includes a connecting portion 27a provided on the lower surface of the divided transverse beam 15a and a connecting portion 7b provided on the lower surface of the divided transverse beam 15b. Have. Each of the connecting portions 27a and 27b is provided with a pin hole 27h. The connecting portions 27a and 27b are overlapped in the Y direction, and the connecting pin 27p is inserted in both the pin holes 27h in the Y direction, whereby the connecting portion 27a and the connecting portion 27b are connected to each other, and the divided transverse beam 15a and the divided transverse beam 15b are connected. And are connected. Further, the split horizontal beam 15a and the split horizontal beam 15b are separated by pulling out the connecting pin 27p in the Y direction. The insertion and removal of the connecting pin 27p as described above may be performed by driving the connecting pin 27p in the Y direction with, for example, a hydraulic jack. In addition, the connection division | segmentation mechanism 29 may comprise the structure similar to the above-mentioned connection division | segmentation mechanism 27, for example.

  In the dismantling and removal method of the present embodiment, after the bridge girder 102 between the piers 101 and 101B is completed, the form receiving beam 21 and the vertical beam 17 are removed as shown in FIG. Next, the winch 41 is installed on the bridge girder 102, and the pulleys 43a, 43b, and 43c are installed at the end of the upper beam 9, the divided horizontal beam 15a, and the divided horizontal beam b, respectively. A wire 45 extending from the winch 41 is hung on the pulleys 43a, 43b, and 43c, and a tip 45a of the wire 45 is fixed to the split transverse beam 15a. Next, by removing the connecting pin 27p of the connecting and splitting mechanism 27, the cross beam 15 is divided into two in the X direction to form split horizontal beams 15a and 15b. From this state, when the wire 45 is fed out from the winch 41, as shown in FIG. 6B, the divided horizontal beams 15a and 15b rotate around the hinge portion 23 by their own weight. Finally, the divided transverse beams 15a and 15b are suspended and supported by the upper beam 9 of the movable pedestal 3 one by one through the respective suspension members 13a and 13b (structure dividing step). At this time, by adjusting the feeding speed of the wire 45 from the winch 41, rapid rotation of the divided transverse beams 15a and 15b can be avoided, and peristalsis of the divided transverse beams 15a and 15b can be suppressed.

  Subsequently, as shown in FIG. 7A, the one suspension member 13 a and the divided transverse beam 15 a are lifted together by the crane 47 installed on the bridge girder 102 and removed from the upper beam 9. The removed suspension member 13a and the divided cross beam 15a are disassembled on the bridge girder 102 and carried out. Instead of the crane 47, the suspension member 13a and the divided cross beam 15a may be lifted and removed from the upper beam 9 by a helicopter, for example. Similarly, the other suspension member 13b and the divided cross beam 15b are removed (removal step).

  Subsequently, as shown in FIG. 7B, the connecting / dividing mechanism 29 is operated to divide the upper beam 9 into two parts, the divided upper beam 9a and the divided upper beam 9b (upper beam dividing step). Then, the split upper beam 9a and one of the wage frame 7 are lifted together by the crane 47, disassembled on the bridge girder 102, and carried out. At this time, the divided upper beam 9 b side may be temporarily supported by the temporary stay 49. Similarly, the divided upper beam 9a and the other wage frame 7 are removed.

  The effect by the above-mentioned dismantling removal method is demonstrated. In this dismantling and removal method, the suspended structure 5 composed of the pair of suspension members 13a and 13b and the cross beam 15 is divided into two. Then, the suspension member 13a and the divided transverse beam 15a, and the suspension member 13b and the divided transverse beam 15b are individually suspended and supported by the movable pedestal portion 3 one by one (structure dividing step), and then suspended. Each part of the suspended structure 5 supported by being lowered is removed from the movable pedestal 3 (removal step). According to such a dismantling / removing method, the suspended work body 1 divided under the bridge girder 102 is separately removed, so that the mobile work vehicle 1 can be installed even at the center of the pier 101 and the pier 101B. Can be dismantled. Therefore, the process of retracting the mobile work vehicle 1 to the vicinity of the pier 101 can be omitted, and the construction period can be shortened.

  Further, the structure dividing step in the dismantling and removing method described above divides the transverse beam 15 in the extending direction into two divided transverse beams 15a and 15b, and the divided transverse beams 15a and 15b are connected to each other via the suspension members 13a and 13b. It is executed in such a manner that the mobile base 3 is suspended and supported one by one. Therefore, the weight balance supported by suspension on both sides of the movable pedestal 3 is good.

(Second Embodiment)
Next, a method for dismantling and removing the mobile work vehicle 1A according to the second embodiment will be described. However, in the present embodiment, the same reference numerals are given to the same or equivalent components as those in the first embodiment described above, and redundant description will be omitted.

  In order to enable the disassembly and removal method of the present embodiment, the mobile work vehicle 1A shown in FIG. 8 has the following configuration. That is, the cross beam 16 of the mobile work vehicle 1A may not be divided into two, unlike the cross beam 15 described above. The cross beam 16 is connected to the suspension member 13b via a connection release mechanism 24 that can be disconnected, and is connected to the suspension member 13a via a hinge portion 23. Here, an example of the connection release mechanism 24 will be described. The connection release mechanism 24 has, for example, the same structure as that of the hinge part 23 (see FIG. 4). And the connection of the cross beam 16 and the suspension member 13b can be cancelled | released by pulling out the connection pin 14 in the hinge part 23 to a Y direction using a hydraulic jack etc. FIG.

  The structure division | segmentation process in the dismantling removal method of this embodiment is demonstrated. In the structure dividing step, the winch 41 on the bridge girder 102 and the pulley 43a at the end of the upper beam 9 are installed, and the wire 45 extending from the winch 41 is connected to the end of the cross beam 16 through the pulley 43a. Subsequently, the connection release mechanism 24 is operated, and the connection between the suspension member 13b and the cross beam 16 is released. From this state, when the wire 45 is fed out from the winch 41, as shown in FIG. 7, the horizontal beam 16 rotates around the hinge portion 23 by its own weight. Finally, the horizontal beam 16 is suspended and supported by the upper beam 9 of the movable pedestal portion 3 via the suspension member 13a. On the other hand, the suspension member 13 b is suspended and supported from the other end side of the upper beam 9. In addition, since processes other than the structure division | segmentation process in the dismantling removal method of this embodiment are the same as that of 1st Embodiment, the overlapping description is abbreviate | omitted.

  The effect by the above-mentioned dismantling removal method is demonstrated. In this dismantling / removal method, the suspended structure 5 is divided into one suspended member 13a and a cross beam 16 and the other suspended member 13b. Then, the one suspension member 13a and the cross beam 16 and the other suspension member 13b are independently suspended and supported by the movable pedestal 3 one by one (structure dividing step), and then suspended. Each part of the supported suspended structure 5 is removed from the movable base part 3 (removal process). Also by such a dismantling removal method, the process of retracting the mobile work vehicle 1A to the vicinity of the pier 101 can be omitted as in the first embodiment, and the construction period can be shortened.

  The present invention can be implemented in various forms including various modifications and improvements based on the knowledge of those skilled in the art including the above-described embodiments. Moreover, it is also possible to configure a modified example using the technical matters described in the above-described embodiment. You may use combining the structure of each embodiment suitably.

  DESCRIPTION OF SYMBOLS 1 ... Mobile work vehicle, 3 ... Moving base part, 5 ... Suspension structure, 7 ... Wagen frame, 9 ... Upper beam, 13a, 13b ... Suspension material, 15 ... Cross beam, 15a, 15b ... Divided cross beam, 23 ... Hinge , 24 ... Connection release mechanism, 27 ... Connection and division mechanism (split mechanism), 102 ... Bridge girder

Claims (6)

A method of dismantling and removing a mobile work vehicle used for the bridge girder overhang construction method,
The mobile work vehicle is
A movable pedestal that is movable in the direction of the bridge axis on the bridge girder;
A pair of suspension members extending downward from the movable pedestal portion and disposed on both sides with the bridge girder in between, and a suspension support supported by the pair of suspension members extending in a direction perpendicular to the bridge axis below the bridge girder And a suspended structure that is supported by the movable pedestal portion,
A structure dividing step in which the suspended structure is divided into two, and each part of the divided suspended structure is suspended and supported by the movable pedestal portion one by one;
After the structure dividing step, each part of the suspended structure is removed from the moving pedestal part, and a removing step of disassembling and carrying out the parts on the bridge girder is provided. Method. In the structure dividing step,
The said horizontal beam is divided | segmented into the extending direction, it is set as two division | segmentation horizontal beams, The said horizontal beam is made into the state suspended and supported by the said movement base part one by one via each said suspension material. How to dismantle and remove mobile work vehicles. A method of dismantling and removing a mobile work vehicle used for the bridge girder overhang construction method,
The mobile work vehicle is
A movable pedestal that is movable in the direction of the bridge axis on the bridge girder;
A pair of suspension members extending downward from the movable pedestal portion and disposed on both sides with the bridge girder in between, and a suspension support supported by the pair of suspension members extending in a direction perpendicular to the bridge axis below the bridge girder And a suspended structure that is supported by the movable pedestal portion,
A structure dividing step in which the suspended structure is divided into two, and each part of the divided suspended structure is suspended and supported by the movable pedestal portion one by one;
A removal step of removing each part of the suspended structure from the movable pedestal after the structure dividing step;
In the structure dividing step,
Said cross beam and releases the connection between one of said hanging member, said transverse beams shall be the state of being suspended on the moving base portion via the other of the suspended material support, dismantling method of transfer operations industry vehicles. The moving pedestal portion includes a plurality of wage frame arranged in a direction perpendicular to the bridge axis,
An upper beam supported by the plurality of wage frame and extending in a direction perpendicular to the bridge axis, to which the suspension member is attached,
The dismantling removal method of the mobile work vehicle according to any one of claims 1 to 3, further comprising an upper beam dividing step of dividing the upper beam in an extending direction after the removing step. It is a mobile work vehicle used for the bridge girder overhang construction method,
A movable pedestal that is movable in the direction of the bridge axis on the bridge girder;
A pair of suspension members extending downward from the movable pedestal portion and disposed on both sides with the bridge girder in between, and a suspension support supported by the pair of suspension members extending in a direction perpendicular to the bridge axis below the bridge girder A suspended structure that is supported by the movable pedestal portion,
The transverse beam can be divided in the extending direction, pin holes provided in each of the divided transverse beams obtained by dividing the transverse beam, connecting pins inserted into and extracted from both the pin holes, and insertion / extraction into the pin holes a dividing mechanism for chromatic and a driving unit for driving the connecting pin in a direction, and
A mobile work vehicle comprising: a hinge portion that hinges the suspension member and the cross beam so as to be relatively rotatable about a bridge axis direction. It is a mobile work vehicle used for the bridge girder overhang construction method,
A movable pedestal that is movable in the direction of the bridge axis on the bridge girder;
A pair of suspension members extending downward from the movable pedestal portion and disposed on both sides with the bridge girder in between, and a suspension support supported by the pair of suspension members extending in a direction perpendicular to the bridge axis below the bridge girder A suspended structure that is supported by the movable pedestal portion,
A hinge portion that hinge-couples the one suspension member and the cross beam so as to be relatively rotatable around a bridge axis direction;
A mobile work vehicle comprising: a connection release mechanism capable of releasing connection between the other suspension member and the cross beam.

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