JP6952572B2 - Overhang erection work vehicle and construction method - Google Patents

Description

The present invention relates to an overhanging erection work vehicle and a construction method.

Conventionally, as a technique in such a field, the construction methods described in Patent Document 1 and Non-Patent Document 1 are known. The construction method of Patent Document 1 is an erection nose method, and the overhanging erection work platform used includes an erection nose overhanging from a bridge girder and a work scaffold suspended and supported by the erection nose. The PC block is lifted by the erection nose and joined to the tip of the existing bridge girder. At this time, in order to avoid interference between the PC block and the work scaffold, two work scaffolds (adhesive suspension scaffold, tension suspension scaffold) are moved to provide a space, and the PC block to be lifted is these two work scaffolds. Pass through the space between. Further, the construction method of Non-Patent Document 1 is to lift a PC block with an overhanging erection work vehicle. By rotating the tip of the lower work floor so that it can be bent downward, interference between the suspended PC block and the lower work floor is avoided.

Japanese Unexamined Patent Publication No. 10-195827

"I visited the construction site of the Makiminato High Bridge Superstructure (P4-P6).", [Online], Structural Engineering Laboratory, Department of Environmental Construction Engineering, Faculty of Engineering, Ryukyu University, [Search on September 19, 2017], Internet, (URL) : http://www.structur.tec.u-ryukyu.ac.jp/doc/0529makiminatokoukakyoukengaku.pdf)

However, when a large-scale work such as driving a work scaffolding or the like below the bridge girder occurs in order to lift or hang the object with the aerial work platform, the work efficiency deteriorates. In addition, construction work using this type of overhanging erection work platform is carried out at high places, and the driving of work scaffolding and lower work floors is also carried out at high places, which imposes a heavy burden on ensuring safety. In view of this problem, it is an object of the present invention to provide an overhanging erection work vehicle and a construction method having high work efficiency and high safety.

The overhanging erection work vehicle of the present invention is an overhanging erection work vehicle used for erection or demolition of a bridge, and is suspended by a moving work vehicle installed on the bridge girder and a position below the bridge girder by the moving work vehicle. It is provided with a supported lower work floor, and the lower work floor is provided with openings that penetrate vertically.

Further, in the overhanging erection work vehicle of the present invention, an object carried into the construction site of bridge erection or demolition, or an object carried out from the construction site is hung by the moving work vehicle and passes through the opening in the vertical direction. It may be lifted or suspended. Further, the object may be a member of the bridge, a temporary material of the bridge, or equipment. Further, the object may be a precast member that is a member of the bridge and is a part of the bridge girder. Further, the opening may be provided so as to be openable and closable.

The construction method of the present invention uses an overhanging erection work vehicle including a mobile work vehicle 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. It is a construction method for erection or dismantling, and the lower work floor is provided with openings that penetrate vertically.

Further, in the construction method of the present invention, an object carried into the construction site for erection or demolition of a bridge, or an object carried out from the construction site is suspended by a moving work vehicle and passed through an opening in the vertical direction to be lifted. It may be provided with a step of being moved or suspended. Further, the object may be a member of the bridge, a temporary material of the bridge, or equipment. Further, the object may be a precast member that is a member of the bridge and is a part of the bridge girder. Further, the opening may be provided so as to be openable and closable.

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

FIG. 1 is a side view of the overhanging erection work vehicle of the embodiment and the bridge to which the construction method is applied. It is a side view which shows the vicinity of the overhanging erection work vehicle in an enlarged manner. It is a top view which shows the vicinity of the overhanging erection work vehicle enlarged. (A) and (b) are side views which show the construction method of an Embodiment in order. (A) and (b) are side views which show the construction method of an Embodiment in order. It is a top view which shows an example of the lower work floor. (A) and (b) are side views showing other examples of the lower work floor, respectively. (A) and (b) are side views showing still another example of the lower work floor. (A) and (b) are side views showing still another example of the lower work floor, respectively. (A) and (b) are side views which show the method of hoisting a diagonal cable.

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

FIG. 1 is a side view showing the bridge 100 and the overhanging erection work vehicle 1. FIG. 2 is an enlarged side view showing the vicinity of the overhanging erection work vehicle 1, and FIG. 3 is a plan view thereof. The bridge girder 102 of the bridge 100 is constructed by the overhang erection method using the overhang erection work vehicle 1. The bridge girder 102 is constructed stepwise by the planned length starting from the capital 103 of the pier 101, and gradually extends in the direction of the bridge axis toward the capital 103 of other adjacent piers. .. Actually, the overhanging erections in two directions are executed in parallel from one stigma 103, but in the present embodiment, only the construction of the overhanging erections in one direction will be described. In the following, words such as "front" and "rear" may be used with the direction in which the bridge girder 102 extends by the overhanging erection method as the front. Further, as shown in the figure, the X-axis is taken in the horizontal direction along the bridge axis perpendicular direction of the bridge 100, the Y-axis is taken in the horizontal direction along the bridge axis direction, and the Z-axis is taken in the vertical direction, and the positional relationship of each part is explained. X, Y, Z may be used for.

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

A rail 105 extending in the bridge axis direction is laid on the upper surface of the existing bridge girder portion 104, and the moving work vehicle 3 can move on the rail 105 in the bridge axis direction. The mobile work vehicle 3 is installed so as to project forward from the front end of the existing bridge girder 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 parallel quadrilateral shape composed of two trusses 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 each other in the direction perpendicular to the bridge axis. An upper beam member 9 or the like for installing equipment or the like is hung on the upper part of each Wagen frame 7. This type of mobile work vehicle is also called a "wagen".

The lower work floor 5 is suspended and supported by the moving work vehicle 3 via the suspension member 11. In this embodiment, four pairs (a total of eight) of hanging members 11 connected to the upper beam member 9 of the mobile work vehicle 3 are used. The lower work floor 5 is located below the existing bridge girder portion 104. On the upper surface of the lower work floor 5, a handrail 15 for use by an operator and a work scaffold 17 are appropriately installed. Further, a formwork receiving beam 19 is arranged between the lower work floor 5 and the existing bridge girder portion 104, and a plurality of formwork receiving beams 19 extend in the bridge axial direction along the bottom surface of the bridge girder 102 (on the formwork receiving beam 19). For example, about 8) beam materials 21 are installed. The plurality of beam materials 21 are arranged at equal intervals on the formwork beam 19 in the direction perpendicular to the bridge axis. A concrete formwork is assembled on the beam material 21, and a part of the bridge girder 102 is constructed by cast-in-place concrete.

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

Subsequently, an example of a construction method for erection of the bridge girder 102 using the overhanging erection work vehicle 1 will be described. The bridge 100 of this embodiment is a cable-stayed bridge. Further, in the bridge 100 of the present embodiment, at least a part of the bridge girder 102 is constructed by precast members. Specifically, concrete cast-in-place and diagonal cable installation are repeated, and the bridge girder 102 is extended from the stigma 103 (see FIG. 1) to a predetermined position. After that, a joint girder, which is a precast member, is constructed at the front end of the existing bridge girder portion 104, and steel girders are sequentially connected to the front of the joint girder. Finally, at the central position with the adjacent capital 103, the last steel girder is joined and closed between the existing bridge girder portions 104.

Hereinafter, an example of the above-mentioned joining girder execution method will be described in detail with reference to FIGS. 2 to 4 and the like. First, as shown in FIGS. 2 and 3, the moving work vehicle 3 is advanced to the front end of the existing bridge girder portion 104. Next, a plurality of climbing jacks 27 (4 in the case of the present embodiment) are installed on the upper beam member 9 of the mobile work platform 3. The installed climbing jack 27 is located vertically above the planned installation position A of the joining girder 31. Further, an opening 25 of the lower work floor 5 is located vertically below the planned installation position A, and the opening 25 is closed at this point. Further, at this point, a plurality of beam materials 21 exist between the planned installation position A and the opening 25. Note that the beam material 21 is not shown in FIG.

Further, vertically below the opening 25, there is a joining girder 31 (see FIG. 4) carried by the pontoon 29. The joining girder 31 is manufactured in advance at a factory or the like as a precast member. Here, an example in which the lower part of the bridge girder 102 is the water surface and the joint girder 31 is carried by the pontoon 29 will be described. Is brought in.

Next, each beam material 21 (see FIG. 2) is moved in the direction perpendicular to the bridge axis, and is installed together on the left and right ends on the formwork receiving beam 19. As a result, the beam material 21 located vertically above the opening 25 is removed. Next, as shown in FIG. 4A, the opening 25 of the lower work floor 5 is opened. The form of opening the opening 25 as shown in FIG. 4A is an example, and the present invention is not limited to this. The opening / closing mechanism of the opening 25 will be described later. By moving the beam material 21 and opening the opening 25 as described above, a lifting path for the joining girder 31 is secured. The opening 25 has dimensions and a shape that allow the joining girder 31 to pass in the vertical direction. The opening 25 forms, for example, a rectangle with a bridge axis direction of 5 to 10 m and a bridge axis perpendicular direction of 10 to 20 m.

Subsequently, as shown in FIG. 4A, the four climbing jacks 27 and the joining girder 31 on the pontoon 29 are connected by the suspension member 35 through the open opening 25. As the hanging material 35, a PC steel wire or the like is used. Then, as shown in FIG. 4B, the joint girder 31 is lifted from the pontoon 29 by the drive of the climbing jack 27, passes through the opening 25, and is transported to the planned installation position A.

After that, the opening 25 is closed, as shown in FIG. 5 (a). The joining girder 31 that has reached the planned installation position A is temporarily joined to the tip of the existing bridge girder portion 104. After that, the beam material 21 is returned to the arrangement below the joint girder 31, and reinforcing bars and concrete formwork 37 for the padded concrete 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 poured into the concrete formwork 37, and as shown in FIG. 5B, the padded concrete 39 is placed between the existing bridge girder portion 104 and the joint girder 31 (space B shown in FIG. 2). Will be built. Since the opening 25 is in a closed state during the temporary joining of the joining girder 31, the installation of the concrete formwork 37, and the work of placing and curing the concrete, the upper surface of the opening 25 can also be used as a work scaffold. can. Further, the upper surface of the closed opening 25 can also be used as an installation space for a heater for heating the interstitial concrete 39 during curing.

Subsequently, an example of the opening / closing mechanism of the opening 25 of the lower work floor 5 will be described. The opening / 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 an object to be lifted or suspended as described above can pass through the opening 25 in the vertical direction. The closed state is a state in which the above-mentioned object cannot pass through the opening 25 in the vertical direction, and the upper surface of the opening 25 can be used as a scaffolding for workers or a storage place for equipment and materials. be.

FIG. 6 is a plan view of the lower work floor 5. As shown in FIG. 6A and the like, the lower work floor 5 includes a beam member 51 extending in the bridge axis direction and arranged in a plurality of rows in a direction perpendicular to the bridge axis, and a scaffold laid on the beam member 51. It includes a plate material 55. At the position corresponding to the opening 25 on the lower work floor 5, the beam member 51 is divided into a front beam member 51a located in front of the opening 25 and a rear beam member 51b located behind the opening 25. There is no beam member 51 above the opening 25. As the beam member 51, for example, H steel is used.

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

In the opening / closing mechanism 50A shown in FIG. 6A, a member (for example, a square steel pipe) that is lighter than H steel and can be manually moved is adopted as the opening beam member 53. Further, both ends of the opening beam member 53 are fixed to the front beam member 51a and the rear beam member 51b, respectively, via a detachable connecting mechanism. Then, as shown in FIG. 6B, the scaffolding plate member 55a and the opening beam member 53 are removed from above the opening 25, so that the opening 25 is opened. The scaffolding plate material 55a and the opening beam material 53 removed from above the opening 25 may be temporarily placed at other positions on the lower work floor 5. In this opening / closing mechanism 50A, as described above, the opening beam member 53 is relatively lightweight, and the operator can move the opening beam member 53 relatively easily by hand. Therefore, the opening 25 is manually opened and closed. can do.

In the opening / closing mechanism 50B shown in FIG. 7A, each opening beam member 53 and each front beam member 51a are connected via a hinge structure portion 59 at the position of the front end of the opening 25. The hinge structure 59 has a rotation axis parallel to the direction perpendicular to the bridge axis. The opening beam member 53 and the rear beam member 51b are connected via a detachable connecting mechanism. In this opening / closing mechanism 50B, the opening 25 can be opened / closed by rotating the door portion 57 around the position of the front end of the opening 25. The hinge structure portion 59 is interposed between the opening beam member 53 and the rear beam member 51b at the position of the rear end of the opening 25, and the door portion 57 is rotated around the position of the rear end of the opening 25. You may do it.

Further, as in the opening / closing mechanism 50C shown in FIG. 7B, the door portion 57 is divided into two front and rear parts in the bridge axis 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 57b may rotate about the hinge structure portion 59b at the rear end position of the opening 25. According to this opening / closing mechanism, the door portion 57 can be opened / closed in a double-opening manner to open / close the opening 25. Further, in this case, the front door portion 57a and the rear door portion 57b are detachably connected by a predetermined connecting mechanism.

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

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

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

Subsequently, the operation and effect of the above-mentioned overhanging erection work vehicle 1 and the construction method will be described. Generally, in the overhanging erection method, the work of bringing in the members of the bridge 100 (for example, the joint girder 31), the temporary materials of the bridge 100, the equipment, etc. from the outside to the construction site or the work of carrying them out from the construction site is performed. appear. In this case, the object to be carried in can be lifted by the moving work vehicle 3 from a position (above the water surface or above the ground) vertically below the overhanging erection work vehicle 1, and the object to be carried out can also be moved. It can be hung and carried out by the work vehicle 3. At this time, the lower work floor 5 located vertically below the mobile work vehicle 3 may interfere with the transportation.

On the other hand, in the overhanging erection work vehicle 1, since the opening 25 is provided vertically below the suspension position (the position of the climbing jack 27) of the mobile work vehicle 3, the object to be lifted or suspended and transported can be lifted or transported. It can be moved by passing through the opening 25 in the vertical direction. Further, as the preparatory work for opening the movement path of the object, the work of opening the opening 25 is sufficient. That is, since it is not necessary to perform large-scale work such as moving the lower work floor 5 itself or deforming a part of the lower work floor 5 (see, for example, Non-Patent Document 1 described above), work efficiency is not required. Is improved. In addition, since the above-mentioned preparatory work is performed at a high place, a burden is imposed on ensuring safety, and the simplification of the preparatory work also contributes to the improvement of safety.

Further, since the opening 25 can be opened and closed, it is possible to close the opening 25 according to the work. When the opening 25 is in the closed state, the upper surface of the opening 25 can be effectively used as a scaffold for workers or a place for storing equipment and materials. Further, since the opening 25 is provided in the central portion of the lower work floor 5, the scaffolding plate material 55b is laid all around the opening 25 even when the opening 25 is open, which is highly safe.

The object to be lifted or hung and moved through the opening 25 is not limited to the joining girder 31 as in the above example. Examples of the object include a member of the bridge 100, a temporary material of the bridge 100, or equipment.

A bridge member is a member that forms a part of a bridge after completion. Bridge members include, for example, precast members such as the above-mentioned joint girder 31, cable-stayed bridge diagonal cable, half precast members, main girder prefabs, grout materials, main drainage devices, reinforcing bars, PC steel materials, diaphragms. Structural members, cable-stayed members, reinforcing bar members, support devices, balustrades, etc. are included.

Temporary materials for bridges are materials that temporarily form part of the bridge and are removed from the bridge by the time it is completed. Temporary materials for bridges include, for example, formwork materials, support materials, concrete curing materials, scaffolding materials, and other members necessary for holding or forming concrete.

The equipment is a machine or the like used in the overhanging erection method other than the one that forms a part of the bridge. This equipment includes, for example, jacks such as the climbing jack 27 described above, a diagonal jack for main tension, a heater for curing, a pump for temporary drainage, a generator, and a vibrator for driving.

Among the above, an example of the work of carrying in the cable-stayed bridge is as shown in FIG. As shown in FIG. 10A, the bridge girder tip 106 formed by casting concrete or the like is located vertically above the opening 25. The diagonal member cable 61 is carried below the overhanging erection work platform 1 by the pontoon 29, and the end portion of the diagonal member cable 61 is pulled up from above the pontoon 29 by the climbing jack 27. The diagonal cable 61 passes through the opening 25 while extending in a cord shape from the pontoon 29. In FIG. 10, the hanging member 35 for pulling up the diagonal member cable 61 is not shown.

After that, the upper end of the diagonal member cable 61 is inserted from the front of the bridge girder tip portion 106, and is inserted into the diagonal member cable installation hole. The upper end of the diagonal cable 61 is pulled out from the upper surface of the existing bridge girder portion 104, and is pulled up diagonally upward toward the tower (not shown) of the bridge 100. After that, as shown in FIG. 10B, the lower end of the diagonal member cable 61 is fixed at the fixing position 106a of the bridge girder tip portion 106 after passing through the opening 25. After that, the upper end of the diagonal member cable 61 is pulled up diagonally upward and finally fixed to the tower, so that the installation of the diagonal member cable 61 is completed. The method of passing the diagonal material cable through the opening 25 and pulling it up as described above is not only for installing the diagonal material cable at the tip 106 of the bridge girder located in front of the moving work vehicle 3, but also for installing the diagonal material cable behind the moving work vehicle 3. It can also be applied to the installation of diagonal cable of the existing portion 104 of the bridge girder located.

The present invention can be carried out in various forms having various modifications and improvements based on the knowledge of those skilled in the art, including the above-described embodiment. It is also possible to construct a modified example by utilizing the technical matters described in the above-described embodiment. The configurations of the respective embodiments may be combined and used as appropriate. Further, the mobile work vehicle of the overhanging erection work vehicle of the present invention is not limited to the type called Wagen, and may be of the type called erection nose. Further, the mobile work vehicle in the present invention may be a mobile support or an erection girder erection machine.

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

1 ... Overhanging erection work vehicle, 3 ... Mobile work vehicle, 5 ... Lower work floor, 25 ... Opening, 31 ... Joint girder (bridge member, precast member), 100 ... Bridge, 102 ... Bridge girder.

Claims (4)

An overhanging erection work vehicle used for erection or demolition of bridges.
A mobile work vehicle installed on the bridge girder and
A lower work floor, which is suspended and supported by the mobile work vehicle at a position below the bridge girder, is provided.
The lower work floor is provided with an opening that penetrates up and down .
The opening is located vertically below the installation position of the precast member forming a part of the bridge girder of the bridge, and the precast member suspended from the moving work vehicle is vertically moved through the opening. Work vehicle. The overhanging erection work vehicle according to claim 1 , wherein the opening is provided so as to be openable and closable. A bridge is erected or demolished using an overhanging erection work vehicle provided with a mobile work vehicle 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. It ’s a construction method,
The lower work floor is provided with an opening that penetrates up and down .
The opening is located vertically below the installation position of the precast member forming a part of the bridge girder of the bridge, and includes a step of vertically moving the precast member suspended from the moving work vehicle through the opening. Construction method. The construction method according to claim 3 , wherein the opening is provided so as to be openable and closable.

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