JP2010031607A - Construction method for grade separation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a grade separation, which is a method for constructing a bridge of grade separated crossing or the like, using one and the same portal crane from the installation of a bridge girder to the installation of a floor slab, so as to reduce a space occupied for the construction work as small as possible, while a construction period can be shortened. <P>SOLUTION: The floor slab 19, whose width direction is arranged in parallel to the moving direction of the portal crane 1, is placed temporarily between rails 3. The floor slab 19 is lifted between a pair of support legs 13. Next, the floor slab 19 is placed on a turn table 21. Then, the turn table 21 is rotated by 90° for rotating the floor slab 19. Under such a condition as the width direction of the floor slab 19 is perpendicular to the moving direction of the portal crane 1, the portal crane 1 is advanced. Since a winch 17 is provided on a projecting portion 14, the support leg 13 and the floor slab 19 are not interfered to each other when lifting the floor slab. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction method for a three-dimensional intersection capable of reducing the construction occupation range of a road as much as possible and shortening a construction period.

  Conventionally, in construction of a three-dimensional intersection such as an intersection, it is necessary to secure a wide occupation occupation range such as a temporary storage place for members and an operation range of a crane for transporting the members. In addition, during the construction period, serious traffic congestion may occur due to the passage of construction vehicles or the like and the influence of traffic restrictions during construction. Therefore, there is a demand for a construction method that minimizes traffic restrictions and the like for a short period of time.

  As a method for eliminating such adverse effects on traffic for a short period of time, on the pair of left and right main girders installed on both sides of the bridge, a floor slab carrier vehicle that can run on the main girder and carry the floor slab is provided. There is a bridge slab erection method in which a floor slab is transported to an installation position by a floor slab conveyance vehicle and installed (Patent Document 1).

  In addition, a superstructure composed of a plurality of divided bodies, which can be connected to each other and folded, is installed on the pier, and the superstructure divided sections are deployed on the pier. There is a method of constructing a bridge (Patent Document 2).

JP 2006-169757 A JP 2004-176531 A

  However, in the bridge floor slab erection method as in Patent Document 1, there is a problem that a floor plate having a width larger than the width of the floor slab transport vehicle used for transporting the floor slab cannot be installed. For this reason, the width of the slab that can be installed is up to the interval between the main girders installed in advance, and a bridge with a structure in which the slab protrudes to both sides of the bridge pier provided in the center should be constructed. I can't. In addition, when installing the main girder etc., it is necessary to use a crane etc. as before, and until the construction of the main girder is completed, it is necessary to carry out traffic regulation etc. as before There's a problem.

  Moreover, in the construction method of a bridge like patent document 2, in order to set it as the structure which can fold an upper work, it can construct the bridge of the shape projected on the both sides of a bridge pier, but it is set as the structure which can fold an upper work. Therefore, since the structure is complicated and the rotating part is made of metal, there is a problem that the durability of the bridge is poor and the construction cost is increased. Moreover, when unfolding the superstructure, it is necessary to regulate traffic below the superstructure, and there is a problem that the effect of relaxing traffic regulations associated with the construction of bridges is not great.

  The present invention has been made in view of such problems, and is a method of constructing a bridge such as a three-dimensional intersection, using the same portal crane from the installation of a bridge girder to the installation of a floor slab, An object is to provide a construction method for a three-dimensional intersection capable of reducing the range as much as possible and shortening the construction period.

  In order to achieve the above-described object, the present invention provides a pair of support legs, wheels attached below the support legs and capable of traveling along rails, a crane girder connecting the pair of support legs, and the crane. A portal crane having a projecting portion provided on a girder and projecting in a traveling direction, and a first winch disposed on the projecting portion and movable along the crane girder, A step (a) of installing the pair of portal cranes on the rail so that the winches face each other, a step (b) of providing a bridge pier between the rails, and a pair of the gates A step (c) of suspending a bridge girder with a type crane and installing the bridge girder on the pier; a step of lifting a floor slab with the portal crane and installing the floor slab on the bridge girder (d); Characterized by comprising It is a construction method of the cross.

  A width of the floor slab is larger than a distance between the pair of support legs, and the step (d) is performed by placing the floor slab in a pair so that a width direction of the floor board faces a moving direction of the portal crane. A step (e) of lifting between the support legs, a step (f) of installing the floor slab on a turntable, and the width direction of the floor slab is substantially perpendicular to the moving direction of the portal crane. A step (g) of rotating the turntable so as to face in a direction, a step (h) of lifting the floor slab with the portal crane, and a step (i) of installing the floor slab on the bridge girder. , May be included.

  The floor slab is a pair of substantially L-shaped members, and the pair of L-shaped members are joined to both ends of a hanging tool. In the step (e), the pair of L-shaped members are joined. The lifting tool is lifted between the pair of support legs so that the width direction of the lifting tool is directed to the moving direction of the portal crane, and the step (i) is the L-shaped member. May be further joined to the vicinity of both ends of the bridge girder, and after the step (i), a step (j) of removing the suspension tool with the portal crane may be further included.

  In this case, the hanging tool can be expanded and contracted in the width direction. When the hanging tool is contracted, the pair of L-shaped members attached to the hanging tool has a width between the pair of supporting legs. The width of the pair of L-shaped members attached to the hanger is larger than the distance between the pair of support legs when the hanger is extended and smaller than the gap, and the step (e) Instead, in the state where the suspension member is contracted, the suspension member to which the L-shaped member is joined so that the width direction of the L-shaped member is substantially perpendicular to the moving direction of the portal crane. A step (k) of lifting between the pair of support legs, and instead of the step (f), the width of the hanger can be changed for the hanger to which the L-shaped member is joined. A step (l) for placing on a flexible telescopic mount, and instead of the step (g), The width of Ri member stretched by the stretch frame may comprise a step (m) to increase the distance between the pair of the L-shaped member.

  The portal crane is provided with a second winch in front of the first winch. In the step (i), the first winch is provided with an L-shaped member to be installed. Is installed on the bridge girder, and the step (j) uses the second winch to place the second hanger provided with the L-shaped member after installation on the bridge girder. It may be a process of removing from.

  In the step (b), even if the pier is provided by installing a prefabricated formwork in which the formwork and reinforcing bars of the pier are assembled with the portal crane and placing concrete into the prefabricated formwork. Good.

  According to the present invention, a pair of portal cranes can perform all steps from installation of piers to installation of floor slabs, installation of other large cranes near a three-dimensional intersection, crane replacement work, etc. Is unnecessary, so it is possible to construct a three-dimensional intersection in a short delivery time. In particular, since it is only necessary to regulate the road only when the portal crane is traveling, traffic regulation can be minimized.

  Moreover, since the winch is provided in the protrusion part, the portal crane can lift and convey a structure wider than a portal crane. In addition, the width of the gate crane need only be wide enough to avoid the piers, so the travel space of the gate crane can be reduced, and traffic control of lanes other than the travel space of the gate crane is restricted. There is no need to do it. Therefore, it is possible to minimize lanes that require traffic regulation.

  Also, by using a turntable, the floor slab, which is wider than the portal crane, is transported in the vertical direction (moving direction of the portal crane), and the floor slab is turned sideways on the turntable (moving the portal crane). The floor slab can be easily transported from the floor slab yard and can be installed sideways on the bridge girder by rotating it in the direction perpendicular to the direction and lifting it again.

  In addition, if the floor slab is a pair of L-shaped members and can be installed at the end of the bridge girder, when the floor slab is installed on the bridge girder, the floor part of the floor slab and the upper part of the bridge girder are double structures. Therefore, the concrete of the floor slab can be reduced. Moreover, if the hanging tool which joins an L-shaped member is used, installation of an L-shaped member is easy, and since the hanging tool can be used repeatedly, it is economical.

  In addition, if the width of the suspension can be expanded and contracted and the width of the suspension is reduced, the suspension attached to the floor slab can be rotated if the width of the suspension can be made smaller than the distance between the support legs of the gate crane. There is no need. In addition, since the area of the floor slab before installation can be reduced, the work can be performed in a narrower work area.

  In addition, by installing a winch that protrudes in two stages on the portal crane, the floor slab and lifting tool to be installed are lifted by the winch on the side close to the support leg, and after installing the floor slab, it was previously installed by the other winch. It is possible to lift the floor stool and collect it. For this reason, after the floor slab is installed on the bridge girder, while the bridge girder and the floor slab are joined on the bridge girder, the next installed floor slab can be transported to the bridge girder by the portal crane, and the work efficiency is high. .

  In addition, the formwork for installing the pier is integrated with rebars and scaffolds in advance, and the integrated prefab formwork is installed with the portal crane, so that the portal crane can be used from the stage of the pier installation. Can be used for manual construction, and construction time can be shortened.

  According to the present invention, a method of constructing a bridge such as a three-dimensional intersection, using the same portal crane from the installation of a bridge girder to the installation of a floor slab, reducing the construction occupation range of the road as much as possible and shortening the construction period It is possible to provide a method for constructing a three-dimensional intersection that can be

  Hereinafter, the construction method of the three-dimensional intersection concerning embodiment of this invention is demonstrated. 1A and 1B are schematic views showing the vicinity of an intersection where a three-dimensional intersection is constructed. FIG. 1A is a plan view and FIG. 1B is a side view.

  The road 7 and the road 8 intersect each other, and a three-dimensional intersection is installed along the main road 8. As shown in FIG. 1, two rows of rails 3 are laid along a road 8 that is an installation position of a three-dimensional intersection.

  A pair of portal cranes 1 are installed on the rails 3. The portal cranes 1a and 1b are installed on the same rail 3 so as to face each other. The portal cranes 1a and 1b are movable along the rails 3, respectively.

  A part of the road 8 other than the traveling part of the portal crane 1 (outside of the rail 3 in the figure) can pass by the vehicle even when the portal crane 1 is moving. Therefore, it is not necessary to regulate traffic on the roadway outside the width of the portal crane 1 on the road 8. Further, the road 7 can be used by vehicles except when the portal crane 1 passes through the intersection. Therefore, some traffic regulation is necessary depending on the movement situation of the portal crane 1, but the traffic on the road 7 can be resumed immediately after the portal crane 1 passes the intersection, so that traffic regulation is minimized. Can be suppressed.

  FIG. 2 is a view showing the portal crane 1, FIG. 2 (a) is a front view, and FIG. 2 (b) is a side view. The portal crane 1 is mainly composed of support legs 13, wheels 11, crane girders 12, protrusions 14, traverse rails 15, winches 17, and the like.

  A pair of support legs 13 are provided substantially vertically. Below the support leg 13, a carriage 16 having wheels 11 is provided. The carriage 16 provided with the wheels 11 can travel on the rail 3 in the direction of arrow B in FIG. In the following description, the left side in FIG. The upper part of the support leg 13 is joined by a crane girder 12. Therefore, when the portal crane 1 is viewed from the front, the lower side is opened by the support leg 13 and the crane girder 12 to form a U-shape. The distance between the pair of support legs 13 is slightly larger than the width of the bridge pier, which will be described later, and the height of the crane girder 12 is sufficiently higher than the bridge pier, so that the portal crane 1 does not interfere with the pier, and the rail 3 You can move up. Details of the pier will be described later.

  The crane girder 12 is provided with a protruding portion 14 that protrudes forward of the portal crane 1. Therefore, when the portal crane 1 is viewed from the side, the support leg 13 and the crane girder 12 having the protruding portion 14 form an inverted L-shape.

  A traverse rail 15 is provided below the protrusion 14. A winch 17 is installed on the transverse rail 15. The winch 17 can move in the direction of arrow A in FIG. In addition, the winch 17 can lift and lower the target member up and down with a wire and a lifting tool. At this time, since the winch 17 is provided on the protruding portion 14 protruding forward from the support leg 13, the suspended member does not interfere with the support leg 13.

  Next, the installation method of a pier is demonstrated. In order to construct the pier, a prefab form 50 for the pier is installed. 3A and 3B are diagrams showing the prefabricated mold 50, FIG. 3A is a front view, and FIG. 3B is a sectional view taken along line XX in FIG. The prefab mold 50 includes a mold 51, a scaffold 53, a reinforcing bar 55, and the like.

  The formwork 51 is used when placing concrete. The formwork 51 may be a normal formwork or an embedded formwork. A reinforcing bar 55 is installed in advance inside the mold 51. A scaffold 53 is provided outside the formwork 51. The mold 51, the reinforcing bar 53, and the scaffold 55 are integrated in a factory or the like. As will be described in detail later, when the lower end of the mold 51 is positioned above the lower end of the reinforcing bar 53 and the prefab mold 50 is placed on the ground, a gap 54 is formed between the ground and the mold 51. It is formed. From the gap 54, the reinforcing bar 55 inside the mold 51 is exposed.

  4A and 4B are views showing a state in which the prefabricated formwork 50 is lifted by the portal crane 1, in which FIG. 4A is a front view and FIG. 4B is a side view. The integrated prefabricated formwork 50 is lifted by the winch 17 of the portal crane 1 using a lifting tool 57. As shown in FIG. 4A, the portal crane 1 is slightly larger in width (interval between support legs) than the prefabricated form frame 50 (and the pier formed thereby). For this reason, the prefabricated formwork 50 is lifted between the support legs 13.

  FIGS. 5A and 5B are diagrams showing an installation state of the prefabricated girder 50, in which FIG. 5A is a plan view near an intersection and FIG. 5B is a side view. The prefabricated formwork 50 is temporarily placed in a member place previously installed between the rails 3. The prefabricated formwork 50 is lifted and transported by the portal crane 1 and installed at a predetermined location. At this time, the prefab form 50 is sequentially installed from the center of the three-dimensional intersection (near the intersection with the road 7) to the end (near the three-dimensional intersection approach) by the gate cranes 1a and 1b.

  For example, the portal crane 1 a installs the prefabricated formwork 50 a in the vicinity of the intersection between the road 7 and the road 8. Next, the temporarily placed prefabricated formwork 50b is transported by the portal crane 1b and installed on the front side (left side in the figure) of the prefabricated formwork 50a. If the prefabricated formwork 50 is installed from the front side, it is necessary to transport the prefabricated formwork beyond the installed prefabricated formwork, and the lift of the portal crane becomes insufficient.

  Similarly, the portal crane 1b is installed at a predetermined position in the order of the prefab formwork 50c, 50d. In addition, since the height of the prefabricated formwork 50 corresponds to the height of the installed pier, the height of the prefabricated formwork 50a, 50c installed near the center of the three-dimensional intersection is near the end of the three-dimensional intersection. It is higher than the height of the prefabricated molds 50b and 50d provided.

  A footing (not shown) is provided in advance at the installation position of the prefabricated formwork 50. For example, the prefabricated mold 50 and the footing are joined as follows. As described above, the reinforcing bar 55 protrudes from the lower end of the mold 51, and a gap 54 is formed between the lower end of the mold 51 and the footing surface in a state where the prefab mold 50 is installed on the footing. A reinforcing bar 55 is exposed in the gap 54. Reinforcing bars are embedded in the footing in advance and protrude from the footing surface.

  The reinforcing bars protruding from the footing surface are joined to the reinforcing bars 55 of the prefabricated mold 50. The reinforcing bars are joined by a known method such as a lap joint, a mechanical joint, or welding. The joining operation can be performed from the gap 54. After the joining of the reinforcing bars is completed, the gap 54 between the lower end of the mold 51 and the footing surface is covered with the mold member, and the gap 54 is filled. The prefabricated formwork 50 is fixed onto the footing by joining the reinforcing bars.

  After the installation of the prefabricated formwork 50 is completed, concrete is placed in each formwork. For placing concrete, the portal crane 1 may be used, or a separate placing work may be performed from the road 8 on the side of the prefabricated formwork 50. Since the gap 54 between the lower end of the mold 51 and the footing surface is filled in advance, the concrete cast into the mold 51 does not leak from the lower end of the mold 51.

  FIG. 6 is a view showing a state where the pier 5 is provided using the prefabricated formwork 50, FIG. 6 (a) is a plan view near the intersection, and FIG. 6 (b) is a side view. As described above, the width of the prefabricated formwork 50 is smaller than the width between the support legs of the portal crane 1. Therefore, the pier 5 provided by the prefabricated formwork 50 is also smaller than the width between the support legs of the portal crane 1. For this reason, the portal crane 1 can move across the pier 5.

  The portal crane 1 is higher than the pier 5 and can suspend members on the pier 5. In addition, a member place is provided between the rails 3 and away from the pier 5, and a bridge girder 9 and the like are temporarily placed as shown in FIG. The bridge girder 9 is made of, for example, fiber reinforced concrete.

  Next, a construction method for a three-dimensional intersection will be described. First, as shown in FIG. 7A, the bridge girder 9 is suspended together with the portal cranes 1a and 1b. In order to lift the bridge girder 9, the gate cranes 1a and 1b are moved to the vicinity of the part where the bridge girder 9 is temporarily placed, and the winch 17 is synchronized to lift the bridge girder 9 (see FIG. 7A). Arrow C direction). Since the portal cranes 1a and 1b face each other forward (in the direction in which the protruding portion 14 protrudes), the bridge girder 9 is lifted so that the winches 17 face each other. The bridge girder 9 is lifted to a position higher than the pier 5.

  Next, the traveling speeds of the portal cranes 1a and 1b are synchronized to travel in the direction of arrow D in FIG. At this time, the portal crane 1 does not interfere with the pier 5. When the bridge girder 9 moves to the installation position, the traveling of the portal crane 1 is stopped. Next, as shown in FIG. 7B, the bridge girder 9 is installed on the pier 5 (in the direction of arrow E in the figure) by synchronizing the winches 17 of the portal cranes 1a and 1b.

  The above steps are repeated to install the bridge girder 9 on the pier 5. 8A and 8B are views showing a state where the installation of the bridge girder 9 on the pier 5 is finished, FIG. 8A is a plan view, and FIG. 8B is a side view. A plurality of bridge girders 9 are installed in the horizontal direction and joined together. In addition, a plurality of bridge girder 9 are installed in the longitudinal direction of bridge girder 9 (so as to straddle a plurality of bridge piers 5), and each bridge girder 9 is joined. As described above, when the bridge girder 9 having a long length is installed on the pier 5, the pair of portal cranes 1 a and 1 b is used, so that lifting and installation are easy.

  Next, the floor slab 19 is transported. FIG. 9 is a view showing a state in which the floor slab 19 is transported by the portal crane 1, FIG. 9 (a) is a plan view, and FIG. 9 (b) is a side view. In the subsequent steps, the portal cranes 1a and 1b perform the same operation independently from the opposite side of the longitudinal direction of the installed bridge girder 9, respectively. Therefore, only the process on one side is illustrated. The floor slab 19 is a U-shaped member having a side wall, and is, for example, a precast floor slab. A turntable 21 is installed in front of the bridge girder 9 to be installed.

  First, the floor slab 19 temporarily placed in a member storage place or the like is lifted by the portal crane 1 and transported in the direction of the turntable 21 (in the direction of arrow F in the figure). The floor slab 19 is longer than the distance between the support legs 13 of the portal crane 1. For this reason, when the width direction (longitudinal direction) of the floor board 19 is placed perpendicular to the rail 3, the rail 3 is covered by the floor board 19, and the portal crane 1 cannot move beyond the floor board 19. Therefore, the floor slab 19 is temporarily placed between the rails 3 with the width direction (longitudinal direction) of the floor slab 19 parallel to the moving direction of the portal crane 1, and the floor slab 19 is lifted between the pair of support legs 13. .

  Next, the floor slab 19 is placed on the turntable 21 as shown in FIG. FIG. 10 is a diagram showing a state where the floor board 19 is placed on the turntable 21, FIG. 10 (a) is a plan view, FIG. 10 (b) is a side view, and FIG. 10 (c) is a front view.

  As shown in FIG. 10 (c), when the floor slab 19 is placed on the turntable 21, the width direction of the floor slab 19 faces the moving direction of the portal crane 1. There is no interference with the crane 1. After the floor slab 19 is placed on the turntable 21, the portal crane 1 is retracted slightly rearward to avoid interference when the floor slab 19 rotates on the turntable 21.

  Next, as shown to Fig.11 (a), the turntable 21 is rotated 90 degrees and the floor slab 19 is rotated (arrow G direction in the figure). In a state where the width direction of the floor slab 19 is substantially perpendicular to the moving direction of the portal crane 1, the portal crane 1 is advanced (in the direction of arrow H in FIG. 11B), and the winch 17 is moved to the floor slab 19. It is located above and the floor slab 19 is moved to a position where it can be lifted. In addition, as shown in FIG.11 (b) and FIG.11 (c), the portal crane 1 and the floor slab 19 do not interfere. Moreover, since the winch 17 is provided in the protrusion part 14, when the floor slab 19 is lifted, the support leg 13 and the floor slab 19 do not interfere.

  Next, as shown in FIG. 12A, in the state where the floor slab 19 is lifted, the floor slab 19 is moved to the installation site (in the direction of arrow I in the figure). When the portal crane 1 moves to the installation site, the traveling of the portal crane 1 is stopped, and the floor slab 19 is installed on the bridge girder 9 as shown in FIG.

  FIG. 12C is a diagram showing a state in which the floor slab 19 is installed on the bridge girder 9. As shown in FIG. 12 (c), the floor slab 19 is installed on the bridge girder 9 with its width direction oriented in a direction perpendicular to the longitudinal direction of the bridge girder 9. That is, the width direction of the floor slab 19 extends over the width direction of the bridge girder 9.

  The above steps are repeated, the floor slab 19 is installed on the entire surface of the bridge girder 9, and the floor slabs 19 are joined together. FIG. 13 is a diagram showing a state in which the installation of the floor slab 19 is completed. As described above, the floor slab 19 is simultaneously installed from both sides of the bridge girder 9 in the longitudinal direction by the pair of portal cranes 1. When the installation of the floor slab 19 is completed, the remaining part is constructed with embankment or the like, and the construction of the three-dimensional intersection is completed.

  As described above, according to the construction method of the three-dimensional intersection according to the embodiment of the present invention, it is possible to install the pier 5, the bridge girder 9, and the floor slab 19 by the pair of portal cranes 1. . For this reason, it is possible to construct a three-dimensional intersection in a short delivery time. In particular, since it is only necessary to regulate the road 7 and the like only when the portal crane 1 is traveling, traffic regulation associated with a three-dimensional intersection can be minimized.

  Moreover, since the winch 17 is provided in the protrusion part 14, the portal crane 1 can lift and convey the floor slab 19 wider than the portal crane 1. FIG. Further, by using the turntable 21, the floor slab 19 having a width larger than that of the portal crane 1 is transported in the vertical direction, and the floor slab 19 is rotated sideways on the turntable 21 and lifted again. The floor slab 19 can be easily transported from the floor slab storage place, and the floor slab 19 can also be installed sideways on the bridge girder 9.

  Moreover, since the space | interval of the support leg 13 of the portal crane 1 should just have the space | interval which can avoid the bridge pier 5, the traveling space of the portal crane 1 can be made small, and traveling of the portal crane 1 is possible. There is no need to regulate traffic in lanes other than space. Therefore, it is possible to minimize lanes that require traffic regulation.

  Moreover, if the prefabricated formwork 50 is used, the formwork 51, the scaffold 53, and the reinforcing bar 55 are integrated, so that the installation is easy, and the portal crane 1 can be used to install the prefabricated formwork 50. Therefore, the construction period can be shortened.

  Next, a second embodiment of the present invention will be described. In the following embodiments, components having the same functions as those shown in FIGS. 1 to 13 are assigned the same reference numerals as in FIGS. FIG. 14A is a diagram showing a floor slab 33 and a hanging tool 31 according to the second embodiment. In 2nd Embodiment, the form of a floor board differs from 1st Embodiment. That is, the floor plate 33 is different from the floor plate 19 only in shape and is a pair of substantially L-shaped members.

  The shape of the floor slab 33 is generally the same as the shape in the vicinity of both ends of the floor slab 19. Therefore, it is a shape in which a part of the floor portion of the floor slab 19 is cut out and only both ends are left. For this reason, the width of the pair of floor slabs 33 in a state joined to the hanging tool 31 is substantially the same width as the floor slab 19. A step 34 is provided at the lower end of the floor slab 33. The upper end of the floor slab 33 is joined to the hanging tool 31 by a bolt 37.

  Arms 35 are provided on both sides above the hanger 31. The floor slab 33 and the hanging tool 31 are joined in the vicinity of the tip of the arm 35. In addition, the height of the hanging tool 31 is slightly higher than the height of the floor slab 33. Therefore, when the hanger 31 with the floor slab 33 joined is placed on the ground or the like, the hanger 31 is self-supporting. In this case, the floor slab 33 is suspended by the arm 35. Further, by loosening the bolt 37, the floor slab 33 can be moved downward. When the bolt 37 is removed, the floor slab 33 is detached from the hanger 31.

  FIG. 14B is a diagram illustrating a portal crane 30 used in the second embodiment. The portal crane 30 differs from the portal crane 1 in that the winches 17 are provided in two stages. The protrusion 14 of the portal crane 30 is provided with a protrusion 32 that protrudes further forward. A winch 17a is provided below the protrusion 14 and a winch 17b is provided below the protrusion 32. Accordingly, the portal crane 30 is provided with two winches 17a and 17b in the same direction (forward) by changing the distance from the support leg 13.

  Next, the construction procedure of the solid intersection according to the second embodiment will be described. FIG. 15 is a diagram showing a construction procedure.

  First, after the bridge girder 9 is constructed in the same procedure as in the first embodiment, the floor slab 33a joined to the hanging tool 31a is placed on the turntable 21. Then, as shown to Fig.15 (a), the portal crane 30 is retracted back, and the turntable 21 is rotated (arrow K in the figure).

  Next, as shown in FIG. 15B, the winch 17 a on the side close to the support leg 13 in the state where the width direction (longitudinal direction) of the floor slab 33 is directed to the direction perpendicular to the moving direction of the portal crane 30. To lift the floor slab 33a (hanging tool 31a) (in the direction of arrow L in the figure).

  Next, as shown in FIG. 15 (c), the portal crane 30 is moved in the direction of the installation location of the floor slab 33 a (in the direction of arrow M in the figure), and after moving to the installation location, the floor slab 33 a is moved onto the bridge girder 9. Install (in the direction of arrow N in the figure).

  FIG. 15D is a front sectional view of the installed floor slab 33a. The floor slab 33a is joined in the vicinity of the end of the bridge girder 9 provided. The bridge girder 9 provided at the end is provided with a step corresponding to the step 34 provided in advance below the floor slab 33 a, and the step 34 is combined and joined with the step of the bridge girder 9.

  After the hanging tool 31a is installed on the bridge girder 9, the floor slab 33a can be brought into contact with the bridge girder 9 by loosening the bolt 37. After the bridge girder 9 and the floor slab 33a are joined, the bolt 37 is pulled out, and the floor slab 33a and the hanging tool 31a are detached. Since the floor slab 33a is a pair of L-shaped members, the upper surface of the bridge girder 9 is exposed between the pair of floor slabs 33a when the floor slab 33a is attached.

  Next, as shown in FIG. 16A, the same operation is repeated, and the lifting tool 33b to which the floor slab 33b is joined is lifted by the portal crane 30 (in the direction of arrow O in the drawing) and travels toward the installation portion. (Arrow P direction in the figure).

  Next, as shown in FIG. 16B, the floor slab 33b is installed on the front side of the previously installed floor slab 33a (in the direction of arrow P in the figure). Next, the lifting tool 31a that has already been installed and detached from the floor slab 33a is lifted by a winch 17b provided at a position protruding further forward than the winch 17a from which the floor slab 33b is suspended (arrow in the figure). Q direction). Thus, the removal of the hanging tool 31a is completed. In addition, during the joining operation | work of the floor slab 33b and the bridge girder 9, the portal crane 30 can carry the floor slab 33 installed next.

  According to the construction method of the solid intersection according to the second embodiment, the same effect as the construction method of the solid intersection according to the first embodiment can be obtained. Since the floor slab 33 is a pair of L-shaped members and can be installed at the end of the bridge girder 9, when the floor slab 33 is installed on the bridge girder 9, the upper surface of the bridge girder 9 is between the floor slabs 33. Exposed and the top surface of the bridge girder 9 and the floor board 33 can obtain the same form as the U-shaped floor board 19, and therefore, the concrete of the floor slab can be reduced. Moreover, since the hanging tool 31 which joins an L-shaped member is used, the installation of the L-shaped member is easy, and the hanging tool 31 can be used repeatedly and is economical.

  Further, the portal crane 30 is provided with winches 17a and 17b protruding in two stages, so that the floor slab 33b and the lifting tool 31b to be installed are lifted by the winch 17a near the support leg 13, and the floor slab 33b is mounted on the bridge girder 9, the hanging tool 31a of the floor slab 33a previously installed by the winch 17b can be lifted, removed and collected. For this reason, after the floor slab 33 is installed on the bridge girder 9, while the bridge girder 9 and the floor slab 33 are joined on the bridge girder 9, the next installed floor slab 33 is transported onto the bridge girder 9 by the portal crane 30. Can work with high efficiency.

  Next, a third embodiment of the present invention will be described. FIG. 17 is a diagram illustrating a hanging tool 41 and the like according to the third embodiment. In the third embodiment, the structure of the lifting tool is further different from that of the second embodiment. That is, the hanger 41 is provided with arms 43 on both upper sides, and the floor plate 33 is provided at the tip of the arm 43 with the bolts 37. The arm 43 can be expanded and contracted, and the width of the hanger 41 can be changed.

  FIG. 17A is a front view showing a state in which a suspension 41 having a floor slab 33 bonded to both ends is being transported by the portal crane 30. The hanger 41 can be expanded and contracted in the direction of arrow S in the figure. When lifting the lifting tool 41 with the portal crane 30, the width of the lifting tool 41 is reduced in advance.

  In the state where the hanging tool 41 is most contracted, the width of the floor slab 33 joined to both ends is narrower than the interval between the support legs 13. Therefore, even when the lifting tool 41 is lifted in the direction perpendicular to the moving direction of the portal crane 30, the portal crane 30 is suspended by a normal method without using a turntable or the like. Can be raised.

  In the present embodiment, an extendable frame 45 is used instead of the turntable 21. The telescopic mount 45 is provided between the rails 3 and can be expanded and contracted in a direction substantially perpendicular to the rails 3. In a state where the telescopic mount 45 is contracted, the width becomes narrower than between the support legs 13 of the portal crane 30, so that the portal crane 30 can travel across the extendable mount 45.

  First, as shown in FIG. 17A, the hanger 41 (floor slab 33) is placed on the telescopic frame (in the direction of arrow R in the figure). The telescopic mount 45 and the hanging tool 41 are both in a state where the width is reduced. A jack 47 is provided at a portion where the floor slab 33 of the telescopic mount 45 is placed. The jack 47 can extend and contract in the vertical direction.

  After installing the hanger 41 on the telescopic mount 45, the jack 47 is raised to receive the weight of the floor slab 33. Next, with the jack 47 raised, as shown in FIG. 17B, the telescopic mount 45 is extended (in the direction of arrow T in the figure). The hanger 41 placed on the telescopic gantry 45 extends (in the direction of arrow U in the figure) with the extension operation of the telescopic gantry 45, and the interval between the floor slabs 33 is widened. For example, a hydraulic cylinder or the like can be used for the operation of the jack 47 and the telescopic mount 45.

  The interval between the floor slabs 33 in a state where the width of the lifting tool 41 is extended coincides with the interval between the floor slabs 33 when installed on the bridge girder 9. Therefore, the width of the floor slab 33 is wider than the interval between the support legs 13.

  Next, as shown in FIG. 17 (c), the lifting tool 41 (floor slab 33) having an extended width is lifted (in the direction of arrow V in the figure). At the same time, the jack 47 is contracted and the width of the telescopic mount 45 is contracted (in the direction of arrow W in the figure). When the telescopic gantry 45 is contracted, the portal crane 30 can travel beyond the telescopic gantry 45. Therefore, the floor slab 33 can be installed on the bridge girder 9.

  According to the construction method of the three-dimensional intersection according to the third embodiment, the same effect as the construction method of the three-dimensional intersection according to the first embodiment can be obtained. Moreover, since the width | variety of the hanger 41 can be expanded-contracted and it is smaller than the space | interval of the support leg 13 of the portal crane 30 in the state where the width | variety was shrunk, it is necessary to rotate the hanger 41 with which the floor slab 33 was joined. Absent. In addition, if the hanger 41 is in a contracted state, the area of the storage place for the floor slab 33 before installation can be reduced, so that the work can be performed even in a narrower work area.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

The figure which shows the state which installed the rail 3 in the intersection vicinity which constructs a three-dimensional intersection, and installed a pair of portal crane 1 on the rail 3. FIG. It is a figure which shows the portal crane 1, (a) is a front view, (b) is a side view. It is a figure which shows the prefabricated formwork 50, (a) is a front view, (b) is XX sectional drawing of (a). The figure which shows the state which lifts the prefabricated formwork 50 with the portal crane. The figure which shows the process of installing the prefabricated formwork 50. The figure which shows the state which installation of the bridge pier 5 was completed. The figure which shows the process of conveying the bridge girder 9 with the portal crane 1 and installing on the bridge pier 5. FIG. The figure which shows the state which installation of the bridge girder 9 was completed on the bridge pier 5. FIG. The figure which shows the state which installs the turntable 21 and conveys the floor slab 19 with the portal crane 1. FIG. The figure which shows the state which mounted the floor slab 19 on the turntable 21. FIG. The figure which shows the state which rotated the turntable 21, and orient | assigned the width direction of the floor slab 19 to the substantially perpendicular direction with respect to the moving direction of the portal crane 1. As shown in FIG. The figure which shows the state which conveyed the floor slab 19 of the state which faced the width direction perpendicular | vertical to the moving direction with the portal crane 1, and installed on the bridge girder 9. FIG. The figure which shows the state which completed installation of the floor slab 19 on the bridge girder 9. FIG. (A) is a front view which shows the hanging part 31 and the floor slab 33, (b) is a side view which shows the portal crane 30. FIG. The figure which shows the process of installing the floor slab 33 attached to the hanging tool 31 on the bridge girder 9 using the portal crane 30. FIG. The figure which shows the process of removing the used hanging tool 31 while installing the floor slab 33 attached to the hanging tool 31 on the bridge girder 9 using the portal crane 30. FIG. The figure which shows the process of extending the width | variety of the floor slab 33 using the hanging tool 41 and the expansion-contraction mount 45, and lifting with the portal crane 30. FIG.

Explanation of symbols

1, 30 ......... Gate crane 3 ... Rail 5 ... Piers 7, 8 ... Road 9 ... Bridge girder 11 ... Wheel 12 ... Crane girder 13 ... Support leg 14 ... …… Projection 15 ……… Transverse rail 16 …… Carriage 17 ………… Winch 19 ………… Slab 21 ………… Turntables 31, 41 …… ...... Suspension 32 32 …… Projection 33 ……… Floor slab 34 ......... Step 35 ......... Arms 37 ......... Bolts 43 ......... Arms 45 ...... Extensible mount 47 ...... Jack 50 ...... Prefab form 51 ...... Form 53 ... ... scaffold 55 ...... reinforcing bar 57 ...... hanging tool

Claims (6)

A pair of support legs, wheels attached to the lower side of the support legs and capable of traveling along rails, a crane girder connecting the pair of support legs, and a protrusion provided in the crane girder and projecting in the traveling direction And a portal crane that is movable along the crane girder and has a first winch provided in the protruding portion,
(A) installing the pair of portal cranes on the rail so as to face each other in the moving direction so that the first winches face each other;
Providing a pier between the rails (b);
(C) a step of suspending a bridge girder with a pair of portal cranes and installing the bridge girder on the pier;
A step (d) of lifting the floor slab with the portal crane and installing the floor slab on the bridge girder;
A construction method for a three-dimensional intersection characterized by comprising: The width of the floor slab is larger than the distance between the pair of support legs,
The step (d)
A step (e) of lifting the floor slab between the pair of support legs so that the width direction of the floor board faces the moving direction of the portal crane;
Installing the floor slab on a turntable; and
A step (g) of rotating the turntable so that a width direction of the floor slab is directed in a direction substantially perpendicular to a moving direction of the portal crane;
A step (h) of lifting the floor slab with the portal crane;
Installing the floor slab on the bridge beam (i);
The construction method of the three-dimensional intersection of Claim 1 characterized by comprising. The floor slab is a pair of substantially L-shaped members, and the pair of L-shaped members are joined to both ends of the hanger,
In the step (e), the suspension tool is suspended between the pair of support legs so that the width direction of the suspension tool to which the pair of L-shaped members are joined faces the moving direction of the portal crane. Is the process of raising,
The step (i) is a step of joining the L-shaped member to the vicinity of both ends of the bridge beam,
The method of constructing a three-dimensional intersection according to claim 2, further comprising a step (j) of removing the suspension tool with the portal crane after the step (i). The lifting device can be expanded and contracted in the width direction,
In a state where the suspension tool is contracted, the width of the pair of L-shaped members attached to the suspension tool is smaller than the distance between the pair of support legs,
In the state in which the suspension is extended, the width of the pair of L-shaped members attached to the suspension is larger than the interval between the pair of support legs,
In place of the step (e), the L-shaped member is joined so that the width direction of the L-shaped member is substantially perpendicular to the moving direction of the portal crane in a state where the suspension tool is contracted. A step (k) of lifting the suspended tool between the pair of support legs,
In place of the step (f), the step (l) of placing the hanging tool, to which the L-shaped member is joined, on an extendable frame that can change the width of the hanging tool,
4. The method according to claim 3, further comprising a step (m), in place of the step (g), by extending the width of the hanger using the telescopic mount and increasing the distance between the pair of L-shaped members. Construction method of three-dimensional intersection. The portal crane is provided with a second winch in front of the first winch,
The step (i) is a step of installing the first hanging tool provided with the L-shaped member to be installed on the bridge girder by the first winch,
The step (j) is a step of removing, from the bridge girder, the second suspender provided with the L-shaped member after completion of installation by the second winch. Or the construction method of the three-dimensional intersection of Claim 4.   In the step (b), the pier is provided by installing the prefab form with the pier formwork and rebar assembled by the portal crane and placing concrete into the prefab form. The construction method of the three-dimensional intersection in any one of Claims 1-5 characterized by the above-mentioned.

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