JP4980257B2 - Construction method for column head construction, method for constructing mobile work vehicle using part thereof, and method for extending bridge - Google Patents

Description

  The present invention relates to a prestressed concrete bridge constructed by an overhanging construction method, a construction apparatus for construction of a first overhanging block located above a pier, a construction method of a mobile work vehicle using a part thereof, and a method of overhanging a bridge About.

  Conventionally, in bridge column head construction, a bracket has been provided on the pier so far, and the load of the first block of extension has been supported while using the bracket as a work floor. By constructing the projecting first block, it is possible to place two projecting construction machines on the left and right in the bridge axis direction.

  However, this method has a problem that it takes much time and labor to construct the bracket.

  Further, as shown in FIG. 10, the conventional normal overhanging machine 40 has a long horizontal member 41 having a traveling wheel (moving device) 10 disposed on the traveling rail 33, and the long Two diagonal members, a front diagonal member 39 and a rear diagonal member 42, which are parallel to each other with a lower portion connected to the horizontal member 41 of the scale, and one fixed to the end portions of the diagonal members 39, 42. Vertical beams 6 extending horizontally in the direction of the bridge axis are installed on each of the diagonal members 41 and 42 and the vertical members 6, and viewed from the side, within a parallelogram frame The vertical member 6 is provided on the top. In the figure, 35 is a traveling wheel, and 36 is a leg portion that can be expanded and contracted.

  These are arranged almost on the web of the two-frame bridge main girder, and are connected by a horizontal beam 25 to form a gate shape when viewed from the bridge axis direction.

Since the overhanging machine 40 as described above has a long length in the bridge axis direction, it is not possible to install two overhanging machines 40 in series on the column head.
Therefore, in order to install the column heads with the same width in the bridge pier and the bridge axis direction, and install two overhanging machines in a narrow area, one of the main structure is set to the specified width and the other is narrowed to install the installation machine. It is known to be involved (see, for example, Patent Document 1).
JP 2004-218316 A

However, there remains a problem that two main structures are intricately arranged on a narrow column head and the work space becomes narrower. In addition, there is a problem that after extending the overhanging machine with a narrow main structure width, it must be returned to a specified width.
It is an object of the present invention to provide a construction apparatus for constructing a first block, a construction method for a mobile work vehicle using a part thereof, and a bridge overhang construction method that can advantageously solve the above problems.

In order to advantageously solve the above-described problem, the overhanging first block construction erection device according to the first aspect of the present invention is the overhanging first block construction erection device temporarily installed on the column head, and its construction The erection apparatus includes a support column installed on the column head, a support beam extending from the column head and extending in a construction direction, supported by the support beam, and used as a lateral beam in a mobile work vehicle. A detachable lateral support beam extending in a direction perpendicular to the axis is provided, and the support is suspended and supported by the lateral support beam.
Moreover, in the 2nd invention, in the construction apparatus for construction of the 1st overhang | projection 1st invention, the said support | pillar is made into the support | pillar which can be expanded-contracted, It is characterized by the above-mentioned.
Further, in the third invention, after the construction of the overhanging first block by the construction device for construction of the overhanging first block of the first invention or the second invention, the lateral support beam for supporting the suspension is suspended. Incorporated as a transverse beam in a mobile work vehicle that is movably installed on the first block, and removed the part of the construction equipment for the construction of the first block that is not overhanging and supported by the transverse beam, and incorporated into the transverse beam A construction method of a mobile work vehicle characterized by being a mobile work vehicle.
In the bridge overhang construction method according to the fourth aspect of the present invention, the construction of the overhanging first block according to the first or second aspect of the invention is used to suspend and support the support after the construction of the first overhanging block. The lateral support beam is incorporated as a lateral beam in a mobile work vehicle that is movably installed on the overhanging first block, and the second and subsequent blocks are constructed by the lateral beam built-in mobile work vehicle incorporating the lateral beam. .

According to a first aspect of the present invention, there is an overhanging first block construction erection device temporarily installed on a column head, the erection device having a column installed on the column head, and the column head A support beam extending in the overhang construction direction, and a detachable lateral support beam that is supported by the support beam and extends in a direction perpendicular to the bridge axis that is used as a lateral beam in a mobile work vehicle, and is supported by the lateral support beam. Since the suspension is supported, the overhanging first block can be constructed by the construction installation device temporarily installed on the column head.
In addition, according to the second invention, since the extendable support column is provided, it can be easily replaced and assembled when it is incorporated into a mobile work vehicle as a cross beam.
Further, according to the third invention, after the construction of the overhanging first block by the construction device for construction of the overhanging first block of the first invention or the second invention, the lateral support beam for supporting the suspension work is suspended, Removal of parts of the construction equipment for the construction of the first block of the overhanging first block other than the support work that is suspended and supported by the horizontal beam and the transverse beam only as a horizontal beam in the mobile work vehicle installed movably on the first overhanging block Thus, it is possible to easily construct the horizontal beam built-in mobile work vehicle on the column head and the projecting first block without assembling the mobile work vehicle on a narrow column head as in the prior art. Therefore, it is possible to assemble the mobile work vehicle by effectively utilizing the top of the column head and the overhanging first block.
Further, according to the fourth invention, after the construction of the overhanging first block by the construction device for construction of the overhanging first block of the first invention or the second invention, the lateral support beam for supporting the suspension work by hanging, Incorporated as a horizontal beam in a mobile work vehicle installed movably on the overhanging first block, and the second and subsequent blocks are constructed by a horizontal beam built-in mobile work vehicle that incorporates the horizontal beam, so it moves on a narrow column head Without assembling the work vehicle, the mobile work vehicle can be assembled and the second and subsequent blocks can be constructed by effectively utilizing the top of the pillar and the overhanging first block.

    Next, the present invention will be described in detail based on the illustrated embodiment.

  FIGS. 1-7 shows the process until the installation apparatus 1 of the overhanging first block of the present invention is installed. As shown in FIGS. 1 (a) and 1 (b), a bracket is attached to a concrete pier. After the work scaffold 29 is provided via 29a and the piers 28 are sequentially built, the column head 12 is constructed on the piers 28 using the brackets 29a as shown in FIG.

  Next, as shown in FIG. 3, the overhanging first block construction device 1 is assembled on the column head 12 by sequentially lifting the components constituting the first block using a crane (not shown).

  The overhanging first block construction apparatus 1 includes a plurality of devices arranged at intervals in the bridge axis direction (in the illustrated case, two at intervals in the bridge axis direction, and at intervals in the direction perpendicular to the bridge axis). 2 and a total of 4) of the lower support columns 2 are provided. A hydraulic telescopic jack 3 is provided on the upper portion of each lower support column 2 to form an expandable lower support column 2. The lower part of the telescopic hydraulic jack 3 is detachably attached to the lower support column 2 with bolts or the like. The lower struts 2 are arranged at positions that fit within the plane area of the column head 12, and the lower portions of the lower struts 2 are arranged at both ends of the column head 12 in the direction perpendicular to the bridge axis. In addition, an anchor (anchor nut or anchor bolt “not shown”) embedded and fixed in the column head 12 is detachably installed with a bolt or nut.

  A support beam 5 extending in the bridge axis direction as a lower chord material is installed and fixed over the telescopic jack 3 on the upper part of the two lower support columns 2 on both sides in the bridge axis perpendicular direction, and adjacent to the bridge axis perpendicular direction. In the supporting beam 5, an upper support column 7 is erected in the vertical direction of the telescopic jack 3 and its lower part is detachably fixed, and the upper support columns 7 adjacent to each other in the bridge axis direction are connected to each other. Are connected by an upper connecting member 8, and the upper end portion of the upper support column 7 and the tip end portion of the support beam 5 are connected by an oblique member 9 made of a steel material such as a shape steel. The support frame 2 is connected by a brace 11 to form a side frame 13.

The upper support columns 7 in the side frames 13 adjacent to each other in the direction perpendicular to the bridge axis are connected to each other by an upper lateral connecting member 14 detachably connected thereto by bolts, nuts, and the like, and an end portion of the brace 16. Are connected to form a portal frame as viewed from the bridge axis direction.
The length of each of the supporting beams 5 is a length (in the direction of the bridge axis) that can be constructed by the length of the first overhanging block to be constructed by the overhang construction (the length on which the movable work vehicle for carrying out the overhang construction can be placed). The dimension is longer than the length between the ends of the overhanging first block 15 constructed at a symmetrical position). As described above, the side frames 13 are arranged in two rows, and are integrated by the upper horizontal connecting member 14 and the brace 16 as connecting beams to form a portal frame when viewed from the bridge axis direction.

  As a member for detachably connecting the members, appropriate means such as a bolt / nut or a PC steel rod and a nut may be adopted. On both sides in the direction perpendicular to the bridge axis, the side frames 13 are constituted by the upper and lower support columns, the support beam 5, the upper connecting member 8, the diagonal member 9, and the like.

  The upper part of the front part and the rear part of the support beam 5 provided so as to project forward and rearward in the bridge axis direction, respectively, over the support beam 5 adjacent in the direction perpendicular to the bridge axis, respectively. A pair of front support beams 26 (the right side in FIG. 3) and a pair of rear side support beams 26 (the left side in FIG. 3) that are spaced apart from each other and extend in the direction perpendicular to the bridge axis are not shown. It is detachably attached with bolts and nuts.

  The ends of the pair of front support beams 26 on the front side and the pair of rear support beams 26 on the rear side are respectively provided with screws such as a total-thread different-diameter PC steel bar, a threaded steel bar, and a threaded steel strip. The upper part of the vertical member 17 is supported by a nut 18 or a center hole jack and a nut (not shown) and is supported so as to be adjustable in level, and the four threaded vertical members 17 on the front side are inserted. The work floor 19 on the front side is disposed under the nut 18 screwed into the threaded vertical member 17, or a center hole jack (not shown) inserted into the threaded vertical member 17 and the nut to be screwed in 18, the vertical direction and the tilt angle are supported in an adjustable manner.

  The work floor 19 is attached with a block building mold 20 (see FIG. 4) connected to the column head 12 and a support member (not shown) for supporting the mold. The work floor 19 and the support member constitute a support work.

  The overhanging first block construction apparatus 1 is constituted by the side frame 13 including the support columns 2, 7, the support beam 5 in the bridge axis direction, the lateral support beam 26, the threaded vertical member 17 and the work floor 19. ing.

  From the state shown in FIG. 3, the work floor 19 is held at a predetermined level to build the first overhanging block 15, the formwork 20 is disposed at a predetermined position, and the reinforcing bar and PC cable sheath (both shown) After placing the concrete, the PC steel material placed in the PC cable sheath is tension-fixed at the end of the overhanging first block 15, and the mold is lowered. The overhanging first block 15 is constructed by demolding (state shown in FIG. 4).

  Next, a process of changing from the state of the overhanging first block construction apparatus 1 shown in FIG. 4 to a mobile work vehicle constructed by blocks after the second block will be described.

  From the state shown in FIG. 5, the hydraulic jack 3 on the upper portion of the lower support column 2 is extended, and each of the lateral support beams 26 is provided with a telescopic jack 22 with a space in the middle portion in the direction perpendicular to the bridge axis. The repositionable temporary support column 21 is disposed between the upper surface of the column head 12 and the lower surface of the horizontal support beam 26, and the hydraulic jack 3 is shortened to support the refill temporary column 21 laterally. The upper part of the construction device 1 of the projecting first block above the beam 26 is supported.

Next, it is lifted on the column head 12 and the overhanging first block 15 by a crane or the like, and travels on the front side and the rear side so as to be parallel to the bridge axis perpendicular to the bridge axis and extend in the bridge axis direction. Each rail 33 is laid, and the side rhombus frame 24 of the mobile work vehicle 34 is lifted on each traveling rail 33 by a crane or the like, and the driving wheel 10 for traveling on the side rhombus frame 24 is placed. At the same time, the vertical beams 4 extending in the bridge axis direction of the side rhombus frame 24 are arranged below the respective lateral support beams 26 on the front side and the rear side.
Further, the retractable temporary supporting column 21 can be shortened so that the lower surface of each horizontal support beam 26 on the front side and the rear side is in contact with the upper surface of the vertical beam 4 so that they can be attached and detached with bolts, nuts, or the like. Each lateral support beam 26 is fixed to be a horizontal beam 25 in the mobile work vehicle 34, and the side rhombus frame 24 is connected to the vertical beam 4 and the horizontal beam 25 by bolts and nuts (not shown). Is a portal frame structure. Moreover, the anchor 30 which can be attached or detached with respect to a pillar head or an overhang | projection block is provided in the rear part of the mobile work vehicle 34 suitably.
Next, with a crane or the like, the side frame 13 or the diagonal member 9, the brace 11, the upper connecting member 8, the upper support column 7 and the like constituting the side frame 13 are sequentially disassembled and suspended and removed, The hydraulic jack 3 and the lower support column 2 are suspended and removed.

  Next, the diagonal member 9 and the upper support column 7 and the brace etc. on the support beam 5 are suspended and removed by a crane or the like, and the support beam 5 and the temporary replacement support column 21 are suspended and removed. 12 and the overhanging first block 15 are made to be only the mobile work vehicle 34 or its traveling rail (state shown in FIG. 7). That is, with the support beam including the horizontal support beam member 26 and the work floor suspended and supported by the horizontal support beam 26, the other parts of the first overhanging first block construction device are appropriately disassembled and removed. To do.

  The state of the mobile work vehicle 34 shown in FIG. 7 is as follows. The horizontal beam 25 used from the horizontal support beam 26, and the front work floor 19 and the rear portion supported by the horizontal beam 25 via the threaded vertical member 17. The side work floor 19 is used as it is as a part constituting the moving work vehicle 23 as it is as a part of the construction device 1 of the overhanging first block. Is possible.

  Although not shown in the figure after the mobile work vehicle 34 is formed as described above, the anchor 30 is removed as appropriate, and the mobile work vehicle 34 is moved to the end of the overhanging first block 15 so that the drive wheel 10 and the traveling wheel are moved. Is moved in the overhanging direction to fix the position, the work floor 19 and the formwork 20 are arranged at a predetermined position where the second overhanging second block is to be constructed, and after the bar arrangement of the overhanging second block portion Then, concrete is cast to construct the second overhanging block, and then the same work is repeated to construct a bridge. The same applies to the opposite side of the bridge axis direction.

  In the above-described embodiment, each work floor 19 in the bridge axis direction has an independent form in the bridge axis direction. However, when the present invention is implemented, each work floor 19 is constructed until the overhanging first block is constructed. They may be connected to each other by a connecting material provided with a scaffold part, and the connecting material may be removed after the construction of the first block.

The process for installing the construction apparatus of the overhang | projection 1st block of this invention in a column head is shown, Comprising: (a) is the side view seen from the bridge axis orthogonal direction of the state which completed the bridge pier, (b) ) Is a front view of (a). The process for installing the construction apparatus of the overhang | projection 1st block of this invention in a pillar head is shown, Comprising: (a) is the side view seen from the bridge axis orthogonal direction of the state which constructed the pillar head, (b ) Is a front view of (a). The state which installed the construction apparatus of the overhang | projection 1st block of this invention in a pillar head, Comprising: (a) is the side view seen from the bridge axis perpendicular direction, (b) is the front view of (a). is there. FIG. 4 shows a state in which the projecting first block is constructed from the state of FIG. 3, wherein (a) is a side view seen from the direction perpendicular to the bridge axis, and (b) is a front view of (a). FIG. 4 shows a state in which a refilling temporary receiving column is installed between the column head and the construction device for the projecting first block from the state of FIG. 4, and (a) is a side view seen from the direction perpendicular to the bridge axis. (B) is a front view of (a). From the state of FIG. 5, the rail is laid on the column head and the first block, and the mobile work vehicle with a horizontal beam is assembled on the lower side of the horizontal support beam so that the horizontal support beam is incorporated into the mobile work vehicle as a horizontal beam. It shows a state, (a) is a side view seen from the direction perpendicular to the bridge axis, (b) is a front view of (a). It shows the state of disassembling and removing the construction device for the first projecting block other than the lateral support beams, (a) is a side view seen from the direction perpendicular to the bridge axis, and (b) is the front view of (a). FIG. FIG. 7 shows a state in which a movable working vehicle with a cross beam is extended and moved to the tip side of the first block to fix the position in order to construct the second block, and (a) is a direction perpendicular to the bridge axis. The side view seen from (b) is a front view of (a). It is explanatory drawing of the conventional overhang construction machine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Construction apparatus of 1st block 2 Lower support | pillar 3 Jack 4 Vertical beam 5 Support beam 6 Vertical material 7 Upper support 8 Upper connection material 9 Diagonal material 10 Traveling wheel (moving device)
DESCRIPTION OF SYMBOLS 11 Brace 12 Column head 13 Side frame 14 Upper horizontal connection material 15 Overhang 1st block 16 Brace 17 Threaded vertical member 18 Nut 19 Work floor 20 Formwork 21 Temporary support column 22 Jack 23 Mobile work vehicle 24 Side diamond Frame 25 Lateral beam 26 Lateral support beam 28 Bridge pier 29 Working scaffold 29a Bracket 30 Anchor 33 Traveling rail 34 Mobile work vehicle 35 Traveling wheel 36 Retractable leg 39 Front diagonal member 40 Normal overhanging machine 41 Horizontal material 42 Rear diagonal Material

Claims (4)

  A construction erection device for a first overhang that is temporarily installed on a column head, the construction erection device having a column installed on the column head and extending from the column head in the overhanging direction. A support beam, a detachable lateral support beam that is supported by the support beam and that extends in a direction perpendicular to the bridge axis that is used as a lateral beam in a mobile work vehicle, and supports the suspension work suspended by the lateral support beam. An overhanging apparatus for constructing an overhanging first block, characterized in that:   The construction device for constructing the first projecting block according to claim 1, wherein the support column is an extendable support column.   The construction of the overhanging first block construction apparatus according to claim 1 or 2, wherein after the construction of the overhanging first block, the lateral support beam for supporting the suspension work is movably installed on the overhanging first block. It is incorporated as a horizontal beam in a mobile work vehicle, and the construction work device for the horizontal beam is removed by removing the part of the construction device for the construction of the first extended block other than the support work supported by the horizontal beam. To build a mobile work vehicle.   The construction of the overhanging first block construction apparatus according to claim 1 or 2, wherein after the construction of the overhanging first block, the lateral support beam for supporting the suspension work is movably installed on the overhanging first block. A bridge overhang construction method characterized in that the second and subsequent blocks are constructed using a transverse beam built-in movable work vehicle that incorporates the transverse beam as a transverse beam in a movable work vehicle.