JP6618116B2 - Construction method of pier - Google Patents

Description

  The present invention relates to a pier construction method, for example, a pier construction method that can be suitably applied to a racket-type pier.

  When building bridge piers in urban areas with heavy traffic, it is desirable to minimize the impact on surrounding traffic, whether in the case of rebuilding or new construction.

  For example, the technique described in Patent Document 1 is a coupling device between an existing footing and a steel pier, and is a technology that contributes to the rebuilding of an existing pier. However, when rebuilding an existing pier using this coupling device, After constructing a temporary structure to support the superstructure of the bridge, the existing piers to be reconstructed are dismantled and removed. Then, a new pier is constructed on the upper end of the existing footing from which the existing pier has been removed by using the coupling device, the upper structure of the bridge is supported by the newly constructed pier, and the temporary structure is removed.

  Therefore, this rebuilding work requires the construction and removal of a temporary structure. The main processes are “construction of temporary structure” → “removal of existing piers” → “construction of new piers” → “construction of temporary structures” It is necessary to proceed with the construction in the order of “removal”, which requires a large number of processes and a long construction period. For this reason, the time influence on surrounding traffic becomes large.

  In addition, in order to apply the above-mentioned rebuilding work to the rebuilding of the racket-type pier that supports the upper structure of the upper and lower two layers, it is necessary to construct and remove a temporary structure that supports the upper structure of the upper and lower two layers, Construction and removal of a large temporary structure is required. Here, the racket-type pier is a cross-section with a square shape that is cut along a vertical plane parallel to the direction perpendicular to the bridge axis, and this cross-section extends from a single column. It is a pier that supports the structure. FIG. 24 shows a cross-sectional view of a racket-type pier 200, which is an example of a racket-type pier, cut along a vertical plane parallel to the direction perpendicular to the bridge axis.

  On the other hand, Patent Document 2 proposes a method for rebuilding an existing pier that does not require a temporary structure. The method of rebuilding existing piers proposed in Patent Document 2 is to build one new pier on each side of the bridge axis so that the existing piers to be reconstructed are sandwiched, and the superstructure of the bridge by these new piers. This is a method of removing the existing pier after it is supported, and it is not necessary to construct a temporary structure for supporting the upper structure.

  For this reason, the rebuilding method of the existing pier proposed in Patent Document 2 is more temporal and spatial to the surrounding traffic than the rebuilding work of the existing pier using the technique proposed in Patent Document 1. This is desirable because the influence is small.

  On the other hand, in urban areas where there is a lot of traffic, the social impact of closing a road is great, so the impact of closing the road is minimized as much as possible in terms of time and space. Or it is requested | required to shorten as much as possible. For this reason, not only when rebuilding existing piers, but also when building new piers, the time and space impact on surrounding traffic can be minimized, and more preferably, the time when all lines are closed is eliminated. Or the emergence of further new construction methods that can be shortened as much as possible.

Japanese Patent Laid-Open No. 10-121416 JP 2008-303698 A

  This invention is made | formed in view of this condition, Comprising: It aims at providing the construction method of the pier which can make a required construction space small.

  This invention solves the said subject with the construction method of the following bridge piers.

  That is, the construction method of the pier according to the present invention is a pier that uses a lifter to construct the upper layer beam of the pier having an upper layer beam that supports the superstructure from below and a column portion that supports the upper layer beam. In the construction method, the divided upper layer beam obtained by dividing the upper layer beam in the longitudinal direction is transported to an installation point, and the longitudinal direction of the divided upper layer beam is substantially perpendicular to the bridge axis at the installation point. A pivoting step of pivoting, a lifting step of lifting the split upper layer beam pivoted so that its longitudinal direction is substantially perpendicular to the bridge axis, and lifting to the predetermined installation position. And a connecting step of connecting the divided upper-layer beam to another part of the pier.

  The lifter is a vehicle-loading type lifter loaded on a vehicle, and in the transporting step, the divided upper layer beam is transported in a state of being placed on a mounting portion of the vehicle-loading type lifter, and in the rotating step, the vehicle-loading type lifter is mounted. You may make it rotate the said division | segmentation upper layer beam by rotating the said mounting part of a lifter.

  When the construction method of the pier is carried out on a road having three or more lanes, it is possible to carry out the construction with at least one or more lanes in service.

  In the construction method of the pier, when the pier is a pier for replacing the existing pier, the length of the pier in the direction perpendicular to the bridge axis is longer than the length of the existing pier in the direction perpendicular to the bridge axis. It is also possible to increase the number of lanes before construction.

  The construction method of the pier can be applied to a racket type pier.

  According to the pier construction method according to the present invention, a necessary construction space can be reduced.

The perspective view of the expansion state of the vehicle loading type lifter used with the construction method of the pier which concerns on embodiment of this invention The perspective view of the contraction state of the vehicle loading type lifter used with the construction method of the pier which concerns on embodiment of this invention Side view of extended state of vehicle-mounted lifter used in construction method of pier according to embodiment of present invention (side surface on long side) The side view of the extension state of the vehicle loading type lifter used with the construction method of the pier concerning the embodiment of the present invention (side of the short side) The side view (side surface of a long side) of the contraction state of the vehicle loading type lifter used with the construction method of the pier concerning the embodiment of the present invention The side view (side of the short side) of the contraction state of the vehicle loading type lifter used with the construction method of the pier concerning the embodiment of the present invention The top view which looked at the vehicle loading type lifter used with the construction method of the pier concerning the embodiment of the present invention from the upper part Explanatory drawing which shows typically the conveyance process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the side of the vehicle 50) Explanatory drawing which shows typically the conveyance process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the back of the vehicle 50) Explanatory drawing which shows typically the rotation process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the side of the vehicle 50) Explanatory drawing which shows typically the rotation process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the back of the vehicle 50) In the pier construction method which concerns on embodiment of this invention, explanatory drawing which shows the state before a lifting process after a rotation process (figure seen from the side of the vehicle 50) In the pier construction method according to the embodiment of the present invention, an explanatory view schematically showing the state before the lifting process after the turning process (viewed from the rear of the vehicle 50) Explanatory drawing which shows typically the lifting process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the side of the vehicle 50) Explanatory drawing which shows typically the lifting process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the back of the vehicle 50) Explanatory drawing which shows typically the lifting process and connection process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the side of the vehicle 50) Explanatory drawing which shows typically the lifting process and connection process of the construction method of the pier which concerns on embodiment of this invention (The figure seen from the back of the vehicle 50) Explanatory drawing which shows typically the reduction process of the vehicle loading type lifter 10 among the withdrawal processes of the construction method of the pier which concerns on embodiment of this invention (figure seen from the side of the vehicle 50) Explanatory drawing which shows typically the reduction process of the vehicle load type lifter 10 among the withdrawal processes of the construction method of the pier which concerns on embodiment of this invention (figure seen from the back of the vehicle 50) Explanatory drawing which shows typically the rotation process of the turntable 14 of the vehicle loader type lifter 10 in the withdrawal process of the construction method of the pier according to the embodiment of the present invention (a view seen from the side of the vehicle 50). Explanatory drawing which shows typically the rotation process of the turntable 14 of the vehicle loading type lifter 10 in the withdrawal process of the construction method of the pier according to the embodiment of the present invention (a view seen from the rear of the vehicle 50). Explanatory drawing which shows the state after the withdrawal process completion of the construction method of the pier which concerns on embodiment of this invention (figure seen from the side of the vehicle 50) Explanatory drawing which shows the state after the withdrawal process completion of the construction method of the pier which concerns on embodiment of this invention (the figure seen from the back of the vehicle 50) Sectional view of a racket-type pier 200, which is an example of a racket-type pier

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, the case where the present invention is applied to the rebuilding work of a racket-type pier will be described as an example, but the scope of application of the present invention is not limited to the racket-type pier. In addition, the present invention is not only applicable to pier rebuilding work, but can also be applied to new pier construction work for new lines.

  In the following, first, the lifter used in the pier construction method according to the embodiment of the present invention will be described, and then the pier construction method according to the embodiment of the present invention will be described.

(1) About the lifter used with the construction method of the pier which concerns on embodiment of this invention The lifter used with the construction method of the pier which concerns on embodiment of this invention is a vehicle loading type lifter which can be loaded in a vehicle.

  1 and 2 are perspective views of a vehicle-mounted lifter 10 used in the pier construction method according to the present embodiment. FIG. 1 shows an extended state, and FIG. 2 shows a contracted state. 3 and 4 are side views of the vehicle-mounted lifter 10 in an extended state. FIG. 3 shows a side surface on the long side, and FIG. 4 shows a side surface on the short side. 5 and 6 are side views of the vehicle-mounted lifter 10 in a contracted state. FIG. 5 shows a side surface on the long side, and FIG. 6 shows a side surface on the short side. FIG. 7 is a top view of the vehicle-mounted lifter 10 as viewed from above.

  The vehicle-mounted lifter 10 includes an intermediate frame 12, a pump unit 13, a turntable (rotating means) 14, a lower jack (lifting means) 16, a lower adjustment jack (lifting means) 16A, and an upper jack (lifting). Means) 18, an upper adjustment jack (lifting means) 18 </ b> A, an upper frame 19, a gantry (mounting portion) 20, and a plane moving jack 21.

  The middle frame 12 is a member that becomes a skeleton of the vehicle-mounted lifter 10 and is a rectangular frame. The middle frame 12 is connected to each part (pump unit 13, turntable 14, lower jack 16, upper jack 18) of the vehicle-mounted lifter 10, and serves as a basis for the overall structure of the vehicle-mounted lifter 10. The vehicle-mounted lifter 10 is located near the center in the height direction. The material of the middle frame 12 is not particularly limited as long as necessary proof stress and rigidity can be ensured. For example, a steel material can be used. The middle frame 12 may not be a rectangular frame, and may be a rectangular plate, for example.

  The pump unit 13 has a role of supplying hydraulic pressure to the turntable 14 and the jacks 16, 16A, 18, 18A. The pump unit 13 is located at a position slightly higher than the middle frame 12 inside the middle frame 12, and is attached to the middle frame 12 so as to hold the position.

  The turntable 14 has a square plate shape, and is attached to the middle frame 12 in a state of being positioned below the middle frame 12. When the vehicle-mounted lifter 10 is installed on the vehicle 50, the turntable 14 is installed on the vehicle 50 so that the outer surface (surface facing outward) of the turntable 14 is in contact with the upper surface of the loading platform 50 </ b> A of the vehicle 50. In this state, by supplying hydraulic pressure from the pump unit 13 to the turntable 14, the entire vehicle-mounted lifter 10 excluding the turntable 14 can be rotated around the rotation center axis of the turntable 14. That is, the turntable 14 has a role of rotating the entire vehicle-mounted lifter 10 excluding itself in a substantially horizontal plane around its rotation center axis.

  The lower jacks 16 are jacks that can extend in a direction opposite to the direction in which the gantry 20 is lifted, and are attached to the four corners of the middle frame 12 in a state of being positioned below the middle frame 12. It has a role which lifts up each other part upward. The lower jack 16 extends downward to obtain reaction force from the road surface or the like, so that the other parts of the vehicle-mounted lifter 10 can be lifted upward, and the object placed on the gantry 20 is lifted upward. be able to. Further, the lower jack 16 can be contracted as shown in FIG. 2 after being extended once as shown in FIG. 1, and can be reversibly extended in the vertical direction.

  Four lower jacks 16 are provided in the vehicle-mounted lifter 10 according to the present embodiment, and when viewed from above, the four lower jacks 16 are located at the vertices of a rectangle. The distance between the two lower jacks 16 located at the ends of the long sides of the rectangle (the width of the space between the opposing portions of the two lower jacks 16) is larger than the width of the loading platform 50A of the vehicle 50. It has become. For this reason, the four lower jacks 16 are moved by rotating the vehicle-loading type lifter 10 by a predetermined angle with respect to the rotation center axis of the turntable 14 while being placed on the loading platform 50A of the vehicle 50. The vehicle 50 can be disposed on the outer side in the width direction of the loading platform 50 </ b> A (so as to protrude from the loading platform 50 </ b> A in a horizontal direction orthogonal to the travelable direction of the vehicle 50). When the long side direction of the rectangle formed by the four lower jacks 16 is the traveling direction of the vehicle 50 in the initial arrangement state, by rotating about 90 degrees with respect to the rotation center axis of the turntable 14 The four lower jacks 16 can be arranged on the outer side in the width direction of the loading platform 50A of the vehicle 50 (so as to protrude from the loading platform 50A in the horizontal direction orthogonal to the travelable direction of the vehicle 50).

  The four lower jacks 16 are rotated about the rotation center axis of the turntable 14, and the four lower jacks 16 are placed outside in the width direction of the loading platform 50 </ b> A of the vehicle 50 (horizontal orthogonal to the direction in which the vehicle 50 can travel). The reaction force can be obtained from the road surface by extending the lower jack 16 downward after being arranged in a direction so as to protrude from the loading platform 50A. Therefore, without lowering the vehicle-loading lifter 10 from the loading platform 50A of the vehicle 50, the lower jack 16 is extended downward while the vehicle-loading lifter 10 is placed on the loading platform 50A of the vehicle 50. Reaction force can be obtained.

  The lower adjustment jack 16A is a jack that protrudes further downward from the tip of the lower jack 16, and has a role of finely adjusting the total downward protrusion amount of the lower jack 16 and the lower adjustment jack 16A. The lower adjustment jack 16A is reversibly extendable in the vertical direction.

  The upper jack 18 is a jack that can be extended in the direction in which the gantry 20 is lifted, and is attached to the short side of the middle frame 12 in a state where it is positioned above the middle frame 12. Has the role of moving the When viewed from above, the four upper jacks 18 are arranged so as to be positioned at the vertices of the rectangle. When the upper jack 18 extends upward, the gantry 20 can be lifted upward, and the object placed on the cradle 20 can be lifted upward. Further, the upper jack 18 can be contracted as shown in FIG. 2 after being once extended as shown in FIG. 1, and can be reversibly extended in the vertical direction.

  The upper adjustment jack 18 </ b> A is a jack that protrudes further upward from the tip of the upper jack 18, and the tip is connected to the lower surface of the upper frame 19. The upper adjustment jack 18A has a role of finely adjusting the total upward protrusion amount of the upper jack 18 and the upper adjustment jack 18A and finely adjusting the height position of the gantry 20. The upper adjustment jack 18A can reversibly extend and contract in the vertical direction.

  The upper frame 19 is a rectangular frame, and the tip of the upper adjustment jack 18A is connected to the lower surfaces of the four corners. A gantry 20 is attached to the upper surface of the upper frame 19. Although not shown in detail in the drawing, the gantry 20 is a positioning stage (XY stage) composed of two upper and lower frames for placing an object. A plane moving jack 21 illustrated on the upper surfaces of the two long sides of the upper frame 19 is an actuator for moving the lower frame of the gantry 20 in the long side direction of the upper frame 19. Illustration of an actuator for moving the upper frame of the gantry 20 in the short side direction of the upper frame is omitted. The upper frame 19 may not be a rectangular frame, and may be, for example, a rectangular plate.

  As described above, since the gantry 20 forms a positioning stage (XY stage) with respect to the upper frame 19, the position of the object placed on the gantry 20 can be finely corrected in a substantially horizontal plane. Therefore, the position of the divided upper layer beam 30 can be easily finely corrected in the pier construction method to be described later, and the work time required to construct the upper layer beam of the pier can be shortened.

  Note that the gantry 20 may not be a rectangular frame, and may be, for example, a rectangular plate.

(2) About the construction method of the pier concerning embodiment of this invention FIGS. 8-23 is explanatory drawing which shows typically each process of the construction method of the pier concerning embodiment of this invention. 8, 10, 12, 14, 16, 18, 20, and 22 are views from the side of the vehicle 50, and FIGS. 9, 11, 13, 15, and 17. 19, 21, and 23 are views seen from the rear of the vehicle 50. Note that portions that do not contribute to an understanding of the present invention are omitted as appropriate in each drawing.

  This embodiment is an embodiment in which the above-described vehicle-loading type lifter 10 is used in the construction of installing a racket-type new pier so that it is aligned with the racket-type existing pier 100 having the existing floor slabs 102, 104. is there. The road supported by the racket-type existing bridge pier 100 has three lanes in both the upper layer and the lower layer, and the lower three lanes include a first lane a, a second lane b, and a third lane c.

  FIG. 8 and FIG. 9 are explanatory diagrams schematically showing a situation where the divided upper layer beam 30 is being transported by the vehicle 50. The divided upper layer beam 30 is a member obtained by dividing a newly provided upper layer beam in the longitudinal direction, and is a member constituting a part of the upper layer beam of the newly constructed racket type pier. After completion of the newly constructed racket type pier, , It has a role to support the upper floor slab from below. At both ends in the longitudinal direction of the divided upper layer beam 30, connecting portions 30A and 30B are provided. As shown in FIGS. 8 and 9, the split upper-layer beam 30 is installed by the vehicle 50 in a state where the split upper-layer beam 30 is mounted on the mount 20 of the vehicle-mounted lifter 10 so that the longitudinal direction thereof is substantially the traveling direction of the vehicle 50. Transport to point. In this transportation process, the lane used for the construction is only one lane where the vehicle 50 stops.

  The turntable 14 of the vehicle-mounted lifter 10 is installed on the loading platform 50A of the vehicle 50 so that the lower surface thereof is in contact with the upper surface of the loading platform 50A of the vehicle 50.

  Further, as described above, the vehicle-mounted lifter 10 includes the lower jack 16 that can be extended in the direction opposite to the direction in which the gantry 20 is lifted and the upper jack 18 that can be extended in the direction in which the gantry 20 is lifted. For this reason, the upward moving distance of the divided upper layer beam 30 placed on the mount 20 of the vehicle-mounted lifter 10 can be increased.

  After the vehicle 50 arrives at the installation point of the divided upper layer beam 30, as shown in FIGS. 10 and 11, the gantry 20 is rotated about 90 degrees around the central axis of the turntable 14, and the length of the divided upper layer beam 30 is increased. It is rotated so that the direction is substantially perpendicular to the bridge axis. In this turning process, the lanes used in the construction are two lanes, a first lane a and a second lane b.

  Then, as shown in FIG. 12 and FIG. 13, the cradle 22 is placed on the road that is reached when the lower jack 16 is extended downward. The lanes used at this stage are two lanes, a first lane a and a second lane b.

  When the lower jack 16 of the vehicle-mounted lifter 10 is rotated approximately 90 degrees around the rotation center axis of the turntable 14, it protrudes from the loading platform 50A of the vehicle 50 to the outside in the width direction of the loading platform 50A. After rotating in this way, the lower jack 16 is extended downward, so that a reaction force can be obtained from the road surface while the vehicle-mounted lifter 10 is mounted on the loading platform 50A of the vehicle 50. Therefore, after arriving at the installation point of the divided upper layer beam 30, it is not necessary to lower the vehicle loader 10 from the loading platform 50A of the vehicle 50, and the vehicle loading lifter 10 remains mounted on the loading platform 50A of the vehicle 50. Installation work of the divided upper layer beam 30 can be started, and in the construction method of the pier according to the present embodiment, work accompanying construction can be reduced.

  After the cradle 22 is placed at a predetermined position, as shown in FIGS. 14 and 15, the lower jack 16 of the vehicle-loading lifter 10 is extended downward, and the divided upper beam 30 placed on the gantry 20 is moved upward. lift. The lanes used at this stage are two lanes, a first lane a and a second lane b.

  Next, as shown in FIGS. 16 and 17, the upper jack 18 of the vehicle-mounted lifter 10 is extended upward, the divided upper layer beam 30 is lifted further upward, and the divided upper layer beam 30 is disposed at the installation position. The lanes used at this stage are two lanes, a first lane a and a second lane b.

  As described above, since the gantry 20 forms a positioning stage (XY stage) with respect to the upper frame 19, the position of the object placed on the gantry 20 is finely corrected in a substantially horizontal plane. Can do. Therefore, fine correction of the position when attaching the divided upper layer beam 30 can be performed easily and in a short time.

  Thus, after arrange | positioning the division | segmentation upper layer beam 30 in an installation position, the connection part 30A of the division | segmentation upper layer beam 30 is connected with the connection part 32A of the pillar part 32 of a newly installed pier. The connection method between the connection part 30A of the divided upper beam 30 and the connection part 32A of the column part 32 is not particularly limited. For example, a connection by bolt joining or a connection by welding is adopted as long as necessary connection strength can be secured. can do. Moreover, you may make it connect through the attachment board for connection.

  After completing the connection between the connecting portion 30A of the divided upper tier beam 30 and the connecting portion 32A of the new pier column 32, the divided upper tier beam 30 is directed vertically upward from the new pier column 32 via the connecting portions 30A and 32A. The force will be applied and it will be supported by the pillar part 32 of a new pier.

  When the operation of connecting the divided upper layer beam 30 to the pillar portion 32 of the newly installed pier is completed, the lower jack 16 and the upper jack 18 of the vehicle-mounted lifter 10 are reduced as shown in FIGS. 18 and 19. The lanes used at this stage are two lanes, a first lane a and a second lane b.

  Then, as shown in FIGS. 20 and 21, the entire vehicle-loadable lifter 10 excluding the turntable 14 is rotated approximately 90 degrees around the rotation center axis of the turntable 14, so that the length of the vehicle-loadable lifter 10 is increased. The side direction is set to be substantially the traveling direction of the vehicle 50. The lanes used at this stage are two lanes, a first lane a and a second lane b.

  Thereafter, the cradle 22 is recovered, and the vehicle 50 is brought into a state where it can be removed from the construction site, as shown in FIGS. The lane used at this stage is one lane of the first lane a.

  Thus, when the operation | work which attaches one division | segmentation upper layer beam 30 is complete | finished, the remaining division | segmentation upper layer beam 30 can be connected in the same procedure, and the newly provided racket type pier can be completed.

  As is apparent from the above description of the embodiment of the present invention, in the pier construction method according to the present invention, the necessary work space can be limited by adjusting the length of the divided upper beam 30 to be attached. For example, when working on a three-lane road as in the above-described embodiment, only two lanes can be closed and the remaining one lane can be used. In addition, if the length of the divided upper-layer beam 30 to be attached is shortened, construction can be performed in the work space for one lane. In this case, even when working on a two-lane road, only one lane is blocked. The remaining one lane can be used in the construction state. Thus, in the construction method of the pier according to the present invention, when working on a road having two or more lanes, it is possible to avoid all-line closure.

  Further, when the vehicle-loading lifter 10 is used, it is not necessary to load and unload the vehicle-loading lifter 10 from the loading platform 50A of the vehicle 50 and to load the vehicle-loading lifter 10 on the loading platform 50A of the vehicle 50. There is no need to use a lifter, and the split upper layer beam 30 can be attached. For this reason, when the vehicle load type lifter 10 is used as in the present embodiment, the work involved in the construction can be reduced.

  In addition, when the length of the racket-type pier that is newly provided using the construction method of the pier according to the present invention is longer than the length of the existing racket-type pier in the direction perpendicular to the bridge axis, It is also possible to increase the number of lanes than before construction.

  In addition, when the present invention is used in a new construction of a new route using a racket type pier having two or more lanes in the lower layer, the lower lane used in the construction is adjusted by adjusting the length of the divided upper layer beam 30 to be attached. Other lower lanes other than can be put into service early.

  In the pier construction method according to the present embodiment described above, the vehicle-loading lifter 10 is used, but the construction space is reduced by using the divided upper layer beam 30 (a member obtained by dividing a newly provided upper layer beam in the longitudinal direction). There is no limitation on the method of lifting the divided upper-layer beam 30 as long as the entire line can be prevented by reducing the size, and another vehicle-loading lifter may be used instead of the vehicle-loading lifter 10. Furthermore, instead of a vehicle-mounted type, a field-installed type lifter may be used.

DESCRIPTION OF SYMBOLS 10 ... Vehicle-mounted lifter 12 ... Middle frame 13 ... Pump unit 14 ... Turntable (turning means)
16 ... Lower jack (lifting means)
16A ... Lower adjustment jack (lifting means)
18 ... Upper jack (lifting means)
18A ... Upper adjustment jack (lifting means)
DESCRIPTION OF SYMBOLS 19 ... Upper frame 20 ... Base 21 ... Planar movement jack 22 ... Base 30 ... Split upper layer beam 30A, 30B, 32A ... Connection part 32 ... Pillar part of newly installed pier 50 ... Vehicle 50A ... Loading platform 100 ... Existing pier 102, 104 ... Existing floor slab 200 ... Racquet type pier

Claims (3)

A beam supporting the superstructure from the lower positioned above the 3 or more lanes of the road, when the construction of a bridge leg that having a, and the bar portion for supporting the beam, are stacked the road drivable vehicle A construction method of a pier for laying the beam using a vehicle-mounted lifter,
The split beam obtained by splitting the beam by adjusting the length in the longitudinal direction corresponding to the required work space, the vehicle so that the longitudinal direction is substantially the traveling direction of the vehicle traveling on the lane of the road A transport process for transporting to the installation point in a state where it is placed on the loading part of the loadable lifter ,
A turning step of turning the loading portion of the vehicle-loading lifter so that the longitudinal direction of the split beam is substantially perpendicular to the bridge axis at the installation point;
The split beam rotated so that the longitudinal direction is substantially perpendicular to the bridge axis is placed on the loading portion of the vehicle-loading lifter at the installation point, and the one of the vehicle-loading lifters is placed. A connecting step of lifting up to a predetermined installation position while obtaining a reaction force from the road surface of the road that is on the outer side in the width direction of the vehicle, and connecting with another part of the pier;
Yes, and construction method of pier, characterized by erection of the beam while the vehicle passable state without in construction at least one lane of the road. The pier is a pier to replace the existing piers, the length of the bridge axis perpendicular direction of the pier, in claim 1, wherein longer than the length of the bridge axis perpendicular direction of the existing piers The construction method of the pier described. The piers, construction method piers according to claim 1 or 2, characterized in that the racket type piers.