JP2019078090A - Overhang erection work vehicle and construction method - Google Patents

Abstract

To provide an overhang erection work vehicle and construction method having excellent work efficiency and high safety.SOLUTION: An overhang erection work vehicle 1 is used to erect or dismantle a bridge 100. The overhang erection work vehicle 1 comprises a moving work vehicle 3 installed on a bridge girder existing part 104, and a lower work floor 5 suspended and supported by the moving work vehicle 3 at a position below a bridge girder 102. The lower work floor 5 is provided with an opening 25 penetrating vertically. A member of the bridge 100, a temporary bridge material, or machinery is suspended by the moving work vehicle 3 and passed through the opening 25 in the vertical direction to be moved in a raising or lowering manner.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a hoisting work vehicle and a construction method.

  DESCRIPTION OF RELATED ART Conventionally, the construction method of patent document 1 and a nonpatent literature 1 is known as a technique of such a field. The construction method of Patent Document 1 is an erection nose method, and the overhanging construction vehicle to be used includes an erection nose overhanging from a bridge girder and a work scaffolding supported by the erection nose. The erection nose lifts the PC block and joins it to the tip of the existing bridge girder. At this time, in order to avoid interference between the PC block and the work scaffold, the two work scaffolds (adhesive suspension scaffolds, tension suspension scaffolds) are moved to provide a space, and the lifted PC block is the two work scaffolds. Pass through the space between Moreover, the construction method of the nonpatent literature 1 is what lifts a PC block with a suspension and construction work vehicle. By pivoting the lower working floor so that it is bent downward, interference between the PC block to be lifted and the lower working floor is avoided.

Japanese Patent Application Laid-Open No. 10-195827

"A visit to the construction site of Makiko Viaduct superstructure superstructure (P4-P6)", [online], Faculty of Engineering, Faculty of Environment and Construction Engineering, University of the Ryukyus, [September 19, 2017 search], Internet, (URL http://www.structur.tec.u-ryukyu.ac.jp/doc/0529 makiminatokoukakyoukengaku. pdf)

  However, if a large task such as driving a work scaffold or the like below the bridge girder is performed to lift or suspend an object with a construction work vehicle, the work efficiency is degraded. In addition, since the work with this type of extension work vehicle is carried out at a high place and the driving of the work scaffolding and the lower work floor is also a high place work, a large burden is placed on securing safety. In view of this problem, an object of the present invention is to provide an overhang work vehicle and a construction method with high work efficiency and high safety.

  The overhang work vehicle according to the present invention is a suspension work vehicle used for erection or dismantling of a bridge, and is suspended below the bridge girder by the movable work vehicle installed on the bridge girder and the movable work vehicle And a lower work floor supported, the lower work floor being provided with an opening penetrating vertically.

  Further, in the overhang work vehicle according to the present invention, an object carried in to a construction site of construction or dismantling of a bridge or an object carried out from the construction site is suspended from the mobile work vehicle and passes through the opening in the vertical direction. Then, lifting movement or hanging movement may be performed. In addition, the object may be a member of a bridge, a temporary material of a bridge, or a device. Further, the target object may be a member of a bridge and a precast member which is a part of a bridge girder. In addition, the opening may be provided to be openable and closable.

  The construction method of the present invention uses a floating work vehicle equipped with a mobile work vehicle installed on a bridge girder and a lower work floor suspended and supported by the mobile work vehicle below the bridge girder. It is a construction method which carries out construction or disassembly, and the lower work floor is provided with the opening which penetrates up and down.

  Further, in the construction method of the present invention, an object carried in to a construction site of construction or dismantling of a bridge or an object carried out from the construction site is suspended from a mobile work vehicle and vertically passed through an opening to be lifted It may be provided with the process moved or suspended. In addition, the object may be a member of a bridge, a temporary material of a bridge, or a device. Further, the target object may be a member of a bridge and a precast member which is a part of a bridge girder. In addition, the opening may be provided to be openable and closable.

  According to the present invention, it is possible to provide an overhang work vehicle and a construction method with high work efficiency and high safety.

FIG. 1 is a side view of a bridge to which the overhang work vehicle and the construction method of the embodiment are applied. It is a side view which expands and shows the vicinity of the overhang construction work vehicle. It is a top view which expands and shows the vicinity of the overhang construction work vehicle. (A), (b) is a side view which shows the construction method of embodiment in order. (A), (b) is a side view which shows the construction method of embodiment in order. It is a top view which shows an example of a lower work floor. (A), (b) is a side view which shows the other example of a lower work floor, respectively. (A), (b) is a side view which shows the further another example of a lower work floor. (A), (b) is a side view which shows the further another example of a lower work floor, respectively. (A), (b) is a side view which shows the lifting method of a diagonal material cable.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. For the sake of convenience, substantially the same elements may be denoted by the same reference numerals, and the description thereof may be omitted.

  FIG. 1 is a side view showing a bridge 100 and a suspension work vehicle 1. FIG. 2 is an enlarged side view showing the vicinity of the overhanging work vehicle 1, and FIG. 3 is a plan view thereof. The bridge girder 102 of the bridge 100 is constructed by the overhang construction method using the overhang construction work vehicle 1. The bridge girder 102 is constructed stepwise by the planned length starting from the column head 103 of the bridge pier 101, and extends in the bridge axial direction stepwise toward the column heads 103 of other adjacent bridge piers. . In practice, two-direction overhanging construction is performed in parallel from one column head portion 103, but in the present embodiment, only the construction of one-way overhanging construction will be described. In the following, the direction in which the bridge girder 102 is extended by the overhang construction method may be referred to as “forward” or “backward”. In addition, as shown in the figure, the horizontal direction along the bridge axis perpendicular direction of the bridge 100 is taken along the X axis, the Y direction along the horizontal direction along the bridge axis direction, the Z axis along the vertical direction, Sometimes use X, Y, Z.

  The overhanging work vehicle 1 is installed at a front end portion of an existing portion of the bridge girder 102 (hereinafter referred to as “the existing bridge girder portion 104”). The overhanging work vehicle 1 includes a movable work vehicle 3 installed on the upper surface of the bridge girder existing portion 104 and a lower work floor 5 suspended and supported by the movable work vehicle 3.

  A rail 105 extending in the bridge axial direction is laid on the upper surface of the bridge girder existing portion 104, and the mobile work vehicle 3 can move on the rail 105 in the bridge axial direction. The mobile work vehicle 3 is installed to project forward from the front end of the bridge girder existing portion 104. The mobile work vehicle 3 includes a plurality of Wagen frames 7 arranged in a direction perpendicular to the bridge axis and connected to each other. The wagen frame 7 has a substantially parallelogram shape of two truss in a side view. In the present embodiment, the mobile work vehicle 3 has three Wagen frames 7. The three Wagen frames 7 are arranged parallel to one another in a direction perpendicular to the bridge axis. An upper beam 9 and the like for installing equipment and the like are bridged over the upper portions of the respective Wagen frames 7. This kind of mobile work vehicle is also called "Wagen".

  The lower work floor 5 is suspended and supported by the mobile work vehicle 3 via a suspension material 11. In the present embodiment, four pairs (eight in total) of suspension members 11 connected to the upper beam members 9 of the mobile work vehicle 3 are used. The lower work floor 5 is located below the bridge girder existing portion 104. On the upper surface of the lower work floor 5, a handrail 15 and a work scaffold 17 for use by a worker are appropriately installed. Further, a plurality of mold receiving beams 19 are disposed between the lower work floor 5 and the bridge girder existing portion 104, and a plurality of the girder beams 19 extending along the bottom of the bridge girder 102 in the bridge axial direction For example, about eight beam members 21 are installed. The plurality of beam members 21 are arranged on the mold receiving beam 19 at regular intervals in the bridge axis perpendicular direction. A concrete form is assembled on the beam 21 and a part of the bridge girder 102 is constructed by cast-in-place concrete.

  At the central portion of the lower work floor 5, a rectangular opening 25 penetrating vertically is provided. The opening 25 can be opened and closed in accordance with the work situation. The openings 25 are provided at positions between the front two pairs and the rear two pairs among the connection points of the four pairs of the hanging members 11. According to this arrangement, in the state where the opening 25 is open, the lower work floor 5 having a rectangular annular structure is stably suspended and supported. An object carried into the construction site of the bridge girder 102 from the ground or water surface below the bridge girder 102 is lifted and moved through the opening 25. Further, an object carried out from the construction site to the ground or water surface is suspended and moved through the opening 25. Details of the opening 25 will be described later.

  Then, an example of the construction method which erects the bridge girder 102 using the overhang work vehicle 1 is demonstrated. The bridge 100 of the present embodiment is a cable-stayed bridge. Moreover, in the bridge 100 of the present embodiment, at least a part of the bridge girder 102 is constructed by a precast member. Specifically, the concrete cast-in-place and diagonal cable installation are repeated, and the bridge girder 102 is extended from the column head 103 (see FIG. 1) to a predetermined position. Thereafter, a joint girder, which is a precast member, is installed at the front end of the bridge girder existing portion 104, and a steel girder is sequentially connected to the front following the joint girder. Finally, the final steel girder is joined and closed between the bridge girder existing portions 104 at a central position with the adjacent column head 103.

  Hereinafter, an example of the enforcement method of said joining girder is demonstrated in detail, referring FIGS. 2-4. First, as shown in FIGS. 2 and 3, the mobile work vehicle 3 is advanced to the front end of the bridge girder existing portion 104. Next, a plurality of (four in the case of this embodiment) climbing jacks 27 are installed on the upper beam 9 of the mobile work vehicle 3. The installed climbing jack 27 is positioned vertically above the planned installation position A of the joining girder 31. Further, the opening 25 of the lower work floor 5 is located vertically below the planned installation position A, and at this time the opening 25 is closed. Also, at this time, a plurality of beam members 21 exist between the planned installation position A and the opening 25. In FIG. 3, the beam material 21 is not shown.

  Further vertically below the opening 25, there is a junction girder 31 (see FIG. 4) carried by the charter 29. The joint girder 31 is manufactured in advance as a precast member in a factory or the like. Here, an example will be described in which the lower side of the bridge girder 102 is the water surface and the joint girder 31 is carried by the deck boat 29. However, when the lower side of the bridge girder 102 is the ground, the joint girder 31 is a vehicle such as a trailer. Will be carried.

  Next, the respective beam members 21 (see FIG. 2) are moved in the direction perpendicular to the bridge axis, and are gathered and installed on the left and right ends on the formwork receiving beam 19. Thereby, the beam material 21 located vertically above the opening 25 is removed. Next, as shown in FIG. 4 (a), the opening 25 of the lower work floor 5 is opened. In addition, the form of how to open the opening 25 as shown to Fig.4 (a) is an example, Comprising: It is not limited to this. The opening and closing mechanism of the opening 25 will be described later. By the movement of the beam 21 and the opening of the opening 25 as described above, a lifting path of the joint girder 31 is secured. The opening 25 has a size and a shape that allows the joining girder 31 to pass in the vertical direction. The opening 25 has a rectangular shape of, for example, 5 to 10 m in the bridge axis direction and 10 to 20 m in the bridge axis perpendicular direction.

  Subsequently, as shown in FIG. 4A, the four climbing jacks 27 and the joint girder 31 on the deck vessel 29 are connected by the hanging members 35 through the open openings 25. As the hanging material 35, PC steel wire or the like is used. Then, as shown in FIG. 4 (b), the joint girder 31 is lifted from above the boat 29 by the driving of the climbing jack 27 and is transported to the planned installation position A through the opening 25.

  Thereafter, as shown in FIG. 5A, the opening 25 is closed. The joining girder 31 that has reached the planned installation position A is temporarily joined to the tip of the bridge girder existing portion 104. Thereafter, the beam material 21 is returned to the lower position of the joint girder 31, and a reinforcing bar for concrete for concrete filling and a concrete form 37 are provided on the beam material 21. The climbing jack 27 shown in FIG. 5 may be removed at an appropriate timing.

  After that, concrete is cast on the concrete form 37, and as shown in FIG. 5 (b), the concrete 39 is inserted between the bridge girder existing portion 104 and the joint girder 31 (space B shown in FIG. 2). Be built. At the time of temporary joining of the joint girder 31, installation of the concrete form 37, and placing and curing of concrete, the opening 25 is in a closed state, so the upper surface of the opening 25 may also be used as a working scaffold it can. In addition, the upper surface of the closed opening 25 can also be used as an installation space of a heater for heating the filling concrete 39 during curing.

  Subsequently, an example of the opening and closing mechanism of the opening 25 of the lower work floor 5 will be described. The opening and closing mechanism is a mechanism that can selectively switch between the open state and the closed state of the opening 25. The open state is a state in which the object conveyed by lifting or hanging as described above can pass through the opening 25 in the vertical direction. The closed state is a state in which the above-described object can not pass through the opening 25 in the vertical direction, and the upper surface of the opening 25 can be used as a worker's scaffolding or a place for equipment and materials. is there.

  FIG. 6 is a plan view of the lower work floor 5. As shown in FIG. 6 (a) etc., the lower working floor 5 extends in the bridge axis direction and includes beams 51 arranged in a plurality of rows perpendicular to the bridge axis, and a scaffold laid on the beams 51. A plate 55 is provided. At a position corresponding to the opening 25 on the lower work floor 5, the beam 51 is bisected into a front beam 51a located in front of the opening 25 and a rear beam 51b located behind the opening 25. There is no beam 51 above the opening 25. For example, H steel is used as the beam 51.

  As shown in FIG. 6A, in the closed state of the opening 25, a plurality of opening beam members 53 extending in the bridge axial direction so as to cross the opening 25 are arranged in a plurality of rows in a direction perpendicular to the bridge axis. . The opening beam 53 is supported at both sides by the front beam 51 a and the rear beam 51 b. On the opening 25, a scaffolding plate 55 is laid on the opening beam 53. In the following, among the scaffolding boards 55 of the lower work floor 5, the one installed on the opening 25 is referred to as “scaffolding board 55a”, and the one installed elsewhere is referred to as “scaffolding board 55b”. There is. A door 57 for opening and closing the opening 25 is configured by the opening beam 53 and the scaffold plate 55 a as described above. Also in the following, a member having a plurality of opening beam members and a scaffold plate material laid on the opening beam members is referred to as a "door".

  In the opening and closing mechanism 50A shown in FIG. 6A, a member (for example, a square steel pipe) which is lighter than H steel and movable manually is adopted as the opening beam member 53. Further, both ends of the opening beam 53 are fixed to the front beam 51a and the rear beam 51b via a detachable connection mechanism. Then, as shown in FIG. 6B, the scaffold plate material 55a and the opening beam 53 are removed from the opening 25, whereby the opening 25 is brought into the open state. The scaffold plate 55 a and the opening beam 53 removed from the opening 25 may be temporarily placed at another position on the lower work floor 5. In the opening / closing mechanism 50A, as described above, the opening beam 53 is relatively lightweight, and the worker can relatively easily move the opening beam 53 manually. Therefore, the opening 25 is manually opened and closed. can do.

  In the opening and closing mechanism 50B shown in FIG. 7A, at the position of the front end of the opening 25, each opening beam 53 and each front beam 51a are connected via the hinge structure 59. The hinge structure 59 has a rotation axis parallel to the bridge axis perpendicular direction. The opening beam 53 and the rear beam 51b are connected via a detachable connection mechanism. In the opening and closing mechanism 50B, the opening 25 can be opened and closed by pivoting the door 57 around the position of the front end of the opening 25. The hinge structure 59 is interposed between the opening beam 53 and the rear beam 51 b at the position of the rear end of the opening 25 so that the door 57 can be pivoted about the position of the rear end of the opening 25. You may

  Further, as in the opening and closing mechanism 50C shown in FIG. 7B, the door portion 57 is divided into two in the bridge axial direction, and the front door portion 57a rotates around the hinge structure portion 59a at the front end position of the opening 25. The rear door portion 57 b may rotate around the hinge structure portion 59 b at the rear end position of the opening 25. According to this opening and closing mechanism, the opening 25 can be opened and closed by opening and closing the door portion 57 in a double-opening manner. Further, in this case, the front door portion 57a and the rear door portion 57b are detachably coupled by a predetermined coupling mechanism.

  In the opening and closing mechanism 50D shown in FIG. 8A, the door portion 57 is divided into right and left in the bridge axis perpendicular direction. The lower work floor 5 has a slide mechanism for sliding the divided right door portion 57c and left door portion 57d in the direction perpendicular to the bridge axis. The slide mechanism may have, for example, a rail or the like for guiding the right door portion 57c and the left door portion 57d in a direction perpendicular to the bridge axis. According to the opening and closing mechanism 50D, as shown in FIG. 8B, the opening 25 is opened and closed by sliding the right door portion 57c and the left door portion 57d left and right along the lower work floor 5. Can.

  Further, as in the opening and closing mechanism 50E shown in FIG. 9A, the right door portion 57c and the left door portion 57d may be slid in the bridge axial direction. Further, as shown in FIG. 9B, the integral door portion 57 may be slid in the bridge axial direction or in the direction perpendicular to the bridge axis without dividing the door portion 57.

  The movement of each door 57, 57a, 57b, 57c, 57d in the opening / closing mechanism 50B to 50E is appropriately performed using, for example, a manual device or an automatic device using a drive system such as a chain block, an electric motor, or a chill hole. . The opening and closing mechanism of the opening 25 is not limited to the examples of the opening and closing mechanisms 50A to 50E described above. That is, another mechanism may be adopted as long as the mechanism can selectively switch the open state and the closed state of the opening 25.

  Then, the operation effect by the above-mentioned overhang construction work vehicle 1 and construction method is explained. Generally, in the overhang construction method, the work (for example, joint girder 31) of the bridge 100, the temporary construction material of the bridge 100, or the equipment is carried into the construction site from the outside or carried out from the construction site to the outside Occur. The object carried in in this case can be lifted and carried in by the mobile work vehicle 3 from the vertically lower position (on the water surface or on the ground) of the overhang work vehicle 1, and the object carried out also moves The work vehicle 3 can be hung and carried out. At this time, the lower work floor 5 located vertically below the mobile work vehicle 3 can be an obstacle to transportation.

  On the other hand, since the opening 25 is provided vertically below the hanging position (position of the climbing jack 27) of the mobile work vehicle 3 in the overhanging work vehicle 1, the object to be lifted or suspended is The opening 25 can be moved in the vertical direction. Further, as a preparatory work for opening the movement path of the object, it is sufficient to make the opening 25 open. That is, since the large work such as moving the lower work floor 5 itself or deforming a part of the lower work floor 5 (see, for example, the aforementioned non-patent document 1) is unnecessary, the work efficiency Can be improved. In addition, since the preparation work as described above is performed at a high place, a burden on securing the safety is imposed, and the simplification of the preparation work contributes to the improvement of the safety.

  Further, since the opening 25 can be opened and closed, it is possible to put the opening 25 in a closed state according to the operation. When the opening 25 is in the closed state, the upper surface of the opening 25 can be effectively used as a foothold of a worker or a place for equipment and materials. Further, since the opening 25 is provided at the central portion of the lower work floor 5, even when the opening 25 is in the open state, the scaffold plate material 55b is laid around the entire opening 25 and safety is high.

  In addition, as an object which passes opening 25 and is lifted or suspended and moved, it is not limited to joining girder 31 like the above-mentioned example. Examples of the target object include members of the bridge 100, temporary materials of the bridge 100, or equipment.

  The member of the bridge is a member that constitutes a part of the completed bridge. For the members of the bridge, for example, a precast member such as the joint girder 31 described above, a diagonal member cable of a cable-stayed bridge, a half precast member, a main girder prefab, a grout member, a permanent drainage device, rebar member, PC steel, diaphragm The structural member, the diagonal member fixing body, the reinforcing bar member, the bearing device, the balustrade and the like are included.

  Temporary materials for bridges are materials that temporarily form part of the bridge and are removed from the bridge by the time of completion. The temporary material of the bridge includes, for example, members necessary for holding or forming concrete, such as a formwork material, a support material, a concrete curing material, and a scaffold material.

  The equipments are machines other than those that form part of a bridge, and are machines and the like used in the overhang construction method. This equipment includes, for example, jacks such as the above-mentioned climbing jacks 27, oblique material jacks for tensioning the permanent installation, heater equipment for curing, temporary drainage pump equipment, a generator, and a vibrator for placement.

  Among the above, an example of the operation of carrying in the diagonal cable of the cable-stayed bridge is as shown in FIG. As shown in FIG. 10A, a bridge girder tip 106 formed by casting a concrete place or the like is positioned vertically above the opening 25. The diagonal cable 61 is carried by the boat 29 to the lower part of the overhanging construction vehicle 1, and the end of the diagonal cable 61 is pulled up from above the boat 29 by the climbing jack 27. The diagonal cable 61 passes through the opening 25 while extending in the form of a cord from the top vessel 29. In FIG. 10, illustration of a hanging material 35 for pulling up the diagonal material cable 61 is omitted.

  Thereafter, the upper end of the diagonal cable 61 is inserted from the front of the bridge gir tip 106 and inserted into the diagonal cable installation hole. The upper end of the diagonal cable 61 is drawn out from the upper surface of the bridge girder existing portion 104, and is pulled diagonally upward toward the tower (not shown) of the bridge 100. Thereafter, as shown in FIG. 10B, the lower end of the diagonal cable 61 passes through the opening 25 and is then fixed at the fixing position 106 a of the bridge gir tip 106. Thereafter, the upper end of the diagonal cable 61 is further pulled up obliquely upward and finally fixed to the tower, whereby the installation of the diagonal cable 61 is completed. As described above, the method of passing the diagonal cable through the opening 25 and pulling it up is not only the diagonal cable installation of the bridge beam tip 106 positioned in front of the mobile work vehicle 3, but also the rear of the mobile work vehicle 3. The present invention can also be applied to the installation of diagonal cable of the existing bridge girder portion 104 located.

  The present invention can be carried out in various forms including various modifications and improvements based on the knowledge of those skilled in the art, including the embodiments described above. Moreover, it is also possible to constitute a modification using the technical matters described in the above-described embodiment. You may use combining the structure of each embodiment suitably. In addition, the mobile work vehicle of the extension work vehicle according to the present invention is not limited to a type called a wagen, and may be a type called an erection nose. In addition, the mobile work vehicle in the present invention may be a mobile support or an installation girder installation machine.

  In the embodiment, an example in which the object is lifted and moved from below through the opening 25 has been described. However, the object (for example, a used temporary material or the like) is suspended and moved downward through the opening 25 May be In the embodiment, the construction at the time of erection of the bridge girder 102 is described as an example, but the overhanging work vehicle 1 may be used for construction of dismantling the bridge 100. For example, when moving a member of a bridge generated by dismantling onto the base ship 29 using the extension work vehicle 1, the member may be suspended and moved through the opening 25.

  DESCRIPTION OF SYMBOLS 1 ... Extension installation work vehicle, 3 ... Mobile work vehicle, 5 ... Lower work floor, 25 ... Opening, 31 ... Junction girder (member of bridge, precast member), 100 ... Bridge, 102 ... Bridge girder.

Claims (10)

It is a suspension work vehicle used for erection or dismantling of a bridge,
Mobile work vehicles installed on the bridge girder,
And a lower work floor suspended and supported by the mobile work vehicle at a position below the bridge girder,
An overhanging work vehicle provided with an opening penetrating vertically in the lower work floor.   The object carried in to the construction site of erection or dismantling of the bridge or the object carried out from the construction site is suspended from the mobile work vehicle and passes vertically through the opening to lift or suspend movement The overhanging work vehicle according to claim 1.   The overhanging work vehicle according to claim 2, wherein the object is a member of the bridge, a temporary material of the bridge, or an equipment.   The overhanging work vehicle according to claim 3, wherein the object is a member of the bridge and a precast member which is a part of the bridge girder.   The overhanging work vehicle according to any one of claims 1 to 4, wherein the opening is provided so as to be openable and closable. A bridge is constructed or disassembled using an overhang work vehicle provided with a mobile work vehicle installed on a bridge girder and a lower work floor suspended and supported by the mobile work vehicle below the bridge girder. It is a construction method and
A construction method, wherein the lower work floor is provided with an opening penetrating vertically.   The object carried in to the construction site of erection or dismantling of the bridge or the object carried out from the construction site is suspended from the mobile work vehicle and passes vertically through the opening to lift or suspend movement The construction method according to claim 6, comprising the following steps:   The construction method according to claim 7, wherein the object is a member of the bridge, a temporary material of the bridge, or an equipment.   The construction method according to claim 8, wherein the target object is a member of the bridge and a precast member which is a part of the bridge girder.   The construction method according to any one of claims 6 to 9, wherein the opening is provided to be openable and closable.

Images