JP2006144282A - Bridge removing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bridge girder and pier removing method in a narrow place unable to use a large crane. <P>SOLUTION: A large head descending device 15, a discent vent 13 composed of a plurality of vents 16 and a support vent 17 composed of a plurality of vents 16, are provided between an under surface of a bridge girder 10 and the ground surface 11. The large head descending device 15 is arranged in an upper part of the descent vent 13. An upper part of the large head descending device 15 and an upper part of the support vent 17, are joined to an under surface of the bridge girder 10. The bridge girder 10 is lowered and removed by alternately removing the vent 16 existing in the lowest part of the descent vent 13 and the vent 16 existing in the lowest part of the support vent 17 by using the large head descending device 15. A pier 100 is removed by this method. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for removing a bridge.

  Conventionally, bridge girders and piers have been removed using large cranes. In this case, a large work space is required for the large crane to perform the work, but there are many service roads under the bridge girders and on the sides of the piers. There is a large working space for the crane. In such a case, there is a problem that the traffic on the service road is obstructed and the influence on public transportation is large.

  Normally, bridge girders and piers are removed by the above method, but in narrow places where large cranes cannot enter and places where the sky is blocked by other structures, the underside of the bridge girders is often removed. At the point, it is supported by a vent from the ground, and a machine for crushing the bridge girder (hereinafter referred to as a hydraulic crusher) is mounted on the bridge girder, and the bridge girder is broken little by little with the hydraulic crusher. It is being removed.

In such a case, since the period required for removal is long, there is a problem that the construction cost increases, and noise and vibration for using the hydraulic crusher are generated, so in residential areas and commercial areas However, there is a risk of disturbing the neighborhood due to noise and vibration.
Moreover, it discloses by the following patent document 1 as an example of the removal method of a bridge.

Japanese Patent Laid-Open No. 9-21115

  In the bridge girder removal method disclosed in Patent Document 1 above, a vehicle that moves under the bridge girder is arranged as means for lowering the bridge girder, a frame is installed thereon, and the bridge girder is used with a large lifting device. ing. When descending the bridge girder from the pier, a space for lowering the bridge girder (hereinafter referred to as a temporary storage yard) is secured on the side of the pier, and the state is maintained by lifting the bridge girder upward using a lifting device. While sliding to the temporary storage yard, the bridge girder descends.

  Thus, in the bridge girder removal method disclosed in Patent Document 1, a large lifting device must be installed. Therefore, in a narrow place where a large crane cannot enter and a place where the sky is blocked Installation is difficult.

  In addition, there is a need for a space for lowering the bridge girder, and in order to secure this space, traffic on the service road under the bridge girder and on the side of the pier will be secured to secure a temporary storage yard. In this case, there is a problem that the traffic on the service road is hindered and the influence on public transportation is great.

  Further, in a large lifting device, the lifting device itself has a height. For this reason, there is a limit to the height at which the bridge girder can be lowered. Therefore, when moving to the temporary storage yard where the bridge girder to be removed is moved, it may be difficult to move if there is an imaginary obstacle such as an electric wire.

  A bridge girder removal method according to a first invention (corresponding to claim 1) that solves the above-mentioned problem is a descent vent comprising a plurality of vents provided with a large lifting device for lowering the bridge girder. A support vent composed of a plurality of vents for supporting the bridge girder is coupled to a lower surface of the bridge girder, and as a first stage, the large lift lowering device is extended to float the lower end of the support vent; The bottom vent of the support vent is removed as a step, the large lift lowering device is reduced as a third step and the lower end of the support vent is grounded, and the large lift lowering device is reduced as a fourth step. The lower end of the descending vent is levitated, the lowermost vent of the descending vent is removed as the fifth stage, and the lower end of the descending vent is grounded by extending the large lift lowering apparatus as the sixth stage. Features.

The pier removal method according to the second invention (corresponding to claim 2) that solves the above-mentioned problem is to support a descent vent having a large lift lowering device for lowering the pier, and a support for the pier. The support vent is connected to the upper side surface of the pier, the lower part of the pier is cut horizontally as a first stage, and the large lift lowering device is extended as the second stage and is horizontally moved from the cut position to the upper position. Cut in the direction, extend the large lift lowering device as the third stage, lift the lower end of the support vent and remove the cut pier, and remove the vent at the bottom of the support vent as the fourth stage Then, as the fifth step, the large lift lowering device is reduced to ground the lower end of the support vent, and as the sixth step, the large lift lowering device is reduced to float the lower end of the lowering vent, The descending Ben as stage Bottom to remove the vent in, characterized by grounding the lower end of the drop vent extending the large lift descender as an eighth stage.

  A pier removal method according to a third invention (corresponding to claim 3) that solves the above problem is the pier removal method according to the second invention, wherein a bridge girder is left on the pier, and the bridge A vent for supporting the bridge girder is installed on the lower surface of the girder, the new pier is constructed after the pier is removed, and the vent is removed after the new pier is completed.

The method for removing a bridge girder according to the first invention has the following effects.
The bridge girder can be removed without using a large crane. For this reason, the bridge girder can be removed even in a narrow place where a large crane cannot enter and in a place where the sky is blocked by another structure.
Since a large crane is not used and a temporary temporary storage yard is not required, the bridge girder can be removed with minimum traffic restrictions on the service road. For this reason, the influence on public transportation can be minimized.

Since no large crane is used, there is no need to reinforce the ground to cure the outrigger that supports the large crane.
Since no large crane or hydraulic crusher is used, noise and vibration are not generated. For this reason, in neighborhoods and commercial areas, noise and vibration do not disturb the neighborhood.

The pier removal method according to the second or third invention has the following effects.
The pier can be removed without using a large crane. For this reason, the pier can be removed even in a narrow place where a large crane cannot enter and in a place where the sky is blocked by another structure.
Since a large crane is not used and a temporary storage yard is not required in the vicinity, it is possible to remove the bridge pier with minimal traffic restrictions on the service road. For this reason, the influence on public transportation can be minimized.

Since a large crane is not used, there is no need to reinforce the ground for curing an outrigger for supporting the large crane.
Since no large crane or hydraulic crusher is used, noise and vibration are not generated. For this reason, in neighborhoods and commercial areas, noise and vibration do not disturb the neighborhood.

  In addition to the effect of the second invention, the pier removal method according to the third invention is a new one in the same place after removing the pier with the bridge girder placed on the pier to be removed. Can build piers. As a result, since it is only necessary to regulate traffic to the minimum necessary level, there is an effect that the influence on public transportation can be minimized.

  An embodiment of a method for removing a bridge / pier according to the present invention will be described with reference to FIGS. FIG. 1 is a side view of a device configuration according to an embodiment of the first invention, FIG. 2 is a cross-sectional view of the descending vent and large lifting device of FIG. 1 as viewed from the longitudinal direction of the bridge girder, and FIG. FIG. 4 is a side view of the first stage according to the first invention, FIG. 5 is a side view of the second stage according to the first invention, and FIG. FIG. 7 is a side view of the fourth stage according to the first invention, FIG. 8 is a side view of the fifth stage according to the first invention, and FIG. 9 is the first invention. FIG. 10 is a side view of the final stage according to the first invention, FIG. 11 is a side view of the device configuration according to the embodiment of the second invention, and FIG. 12 is a side view of the pier of FIG. FIG. 13 is a side view of the first stage according to the second invention, FIG. 14 is a side view of the second stage according to the second invention, and FIG. 15 is a third view according to the second invention. Steps 16 is a side view of the fourth stage according to the second invention, FIG. 17 is a side view of the fifth stage according to the second invention, and FIG. 18 is a side view of the sixth stage according to the second invention. 19 is a side view of the seventh stage according to the second invention. FIG. 20 is a side view of the eighth stage according to the second invention. FIG. 21 is a side view of the final stage according to the second invention. 22 is a side view of an apparatus configuration according to an embodiment of the third invention, and FIG. 23 is a cross-sectional view of the bridge pier of FIG. 22 as viewed from the longitudinal direction of the bridge girder 10.

An embodiment according to the first invention will be described.
FIG. 1 shows a side view of an apparatus configuration according to an embodiment of the first invention. The bridge girder 10 to be removed is a simple girder, and in the case of a continuous girder, it is assumed that it is cut into a simple girder. Four frames 12 are installed on the ground 11 below the bridge girder 10 to be removed. When the bridge girder 10 is viewed from the side, a lowering vent 13 is installed on the upper part of the two bases 12 inside the four bases 12 installed, and the upper surface of the base 12 and the lower end of the lowering vent 13 are Connect with bolts.

  A receiving beam 14 is provided at the upper end of the descending vent 13. The upper end portion of the descending vent 13 and the lower surface of the receiving beam 14 are coupled by bolts or welding. A large lift lowering device 15 is installed on the upper surface of the receiving beam 14. For example, when the large lift lowering device 15 is a jack having a total lift of 3 meters, the height of the large lift lowering device 15 is 2.8 meters in the state shown in FIG.

  The upper surface of the receiving beam 14 and the lower part of the large lift lowering device 15 are connected by bolts or welding. The upper part of the large lift lowering device 15 and the lower surface of the bridge girder 10 are joined by anchor bolts or welding. With such a structure, the descending vent 13 and the large lift lowering device 15 can be suspended from the lower surface of the bridge girder 10.

  In the present embodiment, for example, one vent 16 is constituted by four single pillars having a height of 2.5 meters, the vents 16 are stacked up with a small crane, and the joint portions of the vents 16 are coupled by bolts. By doing so, the descending vent 13 can be set to a desired height. The lowering vent 13 may not match the desired height because the height of the vent 16 is 2.5 meters. In that case, a liner (between the upper portion of the large lifting device 15 and the lower surface of the bridge girder 10 is used. It is possible to obtain a desired height by inserting a notch) and changing the thickness of the liner.

  FIG. 2 shows a cross-sectional view of the descending vent 13 and the large lift lowering device 15 as viewed from the longitudinal direction of the bridge girder 10. Under the bridge girder 10, there are service roads 20 on both sides. Therefore, the pedestal 12, the descending vent 13, and the large lift lowering device 15 are installed so as not to protrude to the service road 20 side.

  Further, when the bridge girder 10 is viewed from the side, a support vent 17 is installed on the upper part of the two bases 12 outside the four bases 12 installed, and the upper surface of the base 12 and the lower ends of the support vents 17 are installed. Connect the parts with bolts. A receiving beam 18 is provided at the upper end of the support vent 17. The upper end of the support vent 17 and the lower surface of the receiving beam 18 are coupled by bolts. An upper frame 19 is provided on the upper surface of the receiving beam 18. The upper surface of the receiving beam 18 and the lower surface of the upper frame 19 are coupled by bolts. The upper surface of the upper gantry 19 and the lower surface of the bridge girder 10 are coupled by bolts or welding. With such a structure, the support vent 17 can be suspended from the lower surface of the bridge girder 10.

  In the present embodiment, for example, one vent 16 is constituted by four single pillars having a height of 2.5 meters, the vents 16 are stacked up with a small crane, and the joint portions of the vents 16 are coupled by bolts. Thus, the support vent 17 can be set to a desired height. The support vent 17 may not match the desired height because the height of the vent is 2.5 meters. In that case, a liner (not shown) is provided between the upper surface of the upper mount 19 and the lower surface of the bridge girder 10. ) And the thickness of the liner can be changed to a desired height.

  FIG. 3 shows a sectional view of the support vent 17 as viewed from the longitudinal direction of the bridge girder 10. Under the bridge girder 10, there are service roads 20 on both sides. Therefore, the gantry 12 and the support vent 17 are installed so as not to protrude to the service road 20 side.

  Hereinafter, a method for removing the bridge girder 10 according to the first invention will be described for each stage with reference to FIGS. 1 and 4 to 10. In describing the method of removing the bridge girder 10 according to the first invention, the configuration of the apparatus shown in FIG.

  As a first step, as shown in FIG. 4, the bolts connecting the upper surface of the gantry 12 and the lower end of the support vent 17 are removed from the initial state shown in FIG. It extends | stretches and the clearance gap 40 of 0.2 meters is opened between the lower end part of the support vent 17 and the upper surface of the mount frame 12. FIG. Here, the lift of the large lift lowering device 15 is 3.0 meters high.

As a second stage, as shown in FIG. 5, the vent 16 (see FIG. 1) at the bottom of the support vent 17 is disassembled and removed 50.
As shown in FIG. 6 as a third stage, the large lift lowering device 15 is reduced by 2.7 meters, and the lower end portion of the support vent 17 and the upper surface of the gantry 12 are connected by bolts.

As shown in FIG. 7 as the fourth stage, the large lift lowering device 15 is further reduced by 0.3 meters, and a gap 70 of 0.3 meters is formed between the lower end portion of the lowering vent 13 and the upper surface portion of the gantry 12. I can make it.
As a fifth stage, as shown in FIG. 8, the vent 16 (see FIG. 1) at the bottom of the descending vent 13 is disassembled and removed 80. Here, the lift of the large lift lowering device 15 is 0 meter.
As shown in FIG. 9 as a sixth stage, the large lift lowering device 15 is extended by 2.8 meters, and the lower end of the lowering vent 13 and the upper surface of the gantry 12 are connected by bolts.

  After completion of the sixth stage, the process returns to the first stage again, and the bridge girder 10 is lowered by repeating the first to sixth stages. As shown in FIG. 10, when the bridge girder 10 reaches a height of about 3 meters from the ground, for example, the bridge girder 10 is placed on a low-floor trailer and carried to a temporary storage site for crushing the bridge girder 10. Therefore, the bridge girder 10 is crushed and removed.

An embodiment according to the second invention will be described.
FIG. 11 shows a side view of an apparatus configuration according to the embodiment of the second invention. The pier 100 to be removed in this embodiment may be made of concrete or steel. The gantry 102 is installed on the ground 101 below the pier 100. Since the pier 100 has the service roads 20 on both sides in the width direction, the gantry 102 is installed so as not to protrude from the service road 20 side. A descending vent 103 is installed on the upper surface of the gantry 102. The position where the descending vent 103 is installed is near the center of the pier 100 in the width direction. The upper surface of the gantry 102 and the lower end of the descending vent 103 are coupled by bolts.

  A receiving beam 104 is provided at the upper end of the descending vent 103. The descending vent 103 and the receiving beam 104 are coupled by bolts or welding. A large lift lowering device 105 is installed above the receiving beam 104. For example, when the large lift lowering device 105 is a jack having a total lift of 3 meters, the height of the large lift lowering device 105 is 2.7 meters in the state shown in FIG. The upper part of the receiving beam 104 and the lower part of the large lift lowering device 105 are connected by bolts or welding.

  A receiving beam 106 is provided on the upper portion of the large lifting device 105. The upper part of the large lift lowering device 105 and the lower surface of the receiving beam 106 are connected by bolts or welding. A bracket 107 is provided on the upper surface of the receiving beam 106. The upper part of the receiving beam 106 and the lower part of the bracket 107 are coupled by bolts. The surface of the bracket 107 on the pier 100 side and the surface of the upper portion of the pier 100 on the bracket 107 side are connected by anchor bolts when the pier 100 is made of concrete, and are connected by bolts or welding when the pier 100 is made of steel. . With such a structure, the descending vent 103 and the large lift lowering device 105 can be suspended from the side surface of the pier 100.

  A support vent 108 is installed on the upper surface of the gantry 102. The support vent 108 is installed at a position where the descending vent 103 and the large lift lowering device 105 are sandwiched therebetween. The upper surface of the gantry 102 and the lower end portion of the support vent 108 are coupled by bolts. The upper end portion of the support vent 108 and the receiving beam 106 are coupled by bolts or welding. With such a structure, the support vent 108 can be suspended from the side surface of the pier 100.

  In the present embodiment, for example, one vent is constituted by two single pillars having a height of 2.5 meters, and the vents 109 and 110 are stacked upward with a small crane, and the joint portions of the vents 109 and 110 are formed. By connecting with bolts, the descending vent 103 and the support vent 108 can be set to a desired height. The lowering vent 103 and the supporting vent 108 may not match the desired height because the height of the vents 109 and 110 is 2.5 meters. In this case, the lowering between the lower surface of the bracket 107 and the upper surface of the receiving beam 106 is not possible. A liner (not shown) is sandwiched between and the thickness of the liner can be changed to achieve a desired height.

  The side view which looked at the pier 100 which is going to remove to FIG. 12 from the side is shown. Two sets of the descending vent 103, the large lift lowering device 105, and the support vent 108 are prepared, and the two sets are installed so as to sandwich the bridge pier 100 to be removed.

Hereinafter, the method for removing the pier 100 according to the second invention will be described for each stage with reference to FIGS. 11 and 13 to 20. In describing the method of removing the pier 100 according to the second invention, the configuration of the apparatus shown in FIG. 11 is set to an initial state.
As a first step, as shown in FIG. 13, the lower part of the pier 100 is cut 130 in the horizontal direction from the initial state shown in FIG. 11, and the bolt at the lower end of the support vent 108 is removed. In the case of cutting 130, noise and vibration can be suppressed by using a wire saw as a cutting means and cutting a gas in the case of a steel pier.

  As shown in FIG. 14 as the second stage, the large lift lowering device 105 is extended by 0.2 meters, and the lift of the large lift lowering device 105 is 2.9 meters high. A gap 140 of 0.2 m is formed between the lower end of the support vent 108 and the upper surface of the gantry 102, and the position between the pier 100 is cut in the first stage (hereinafter referred to as the pier cutting surface) and the gantry 102. A gap 141 of 0.2 meters is opened. A liner 142 for placing the cut pier 100 is inserted between the pier cutting surface and the upper surface of the gantry 102, and cut 143 in the horizontal direction at a height of 2.5 meters upward from the pier cutting surface.

  As the third stage, as shown in FIG. 15, the large lift lowering device 105 is extended by 0.1 meter, the lift of the large lift lowering device 105 is 3.0 meters high, the lower end of the support vent 108 and the platform 102 A gap 150 of 0.3 meters is made between the upper surface and a gap of 0.1 meters is made between the upper surface 152 of the cut pier 151 and the lower surface 153 of the pier. The cut pier 151 is placed on the liner 142, and the cut pier 151 is removed on the liner 142.

As a fourth stage, as shown in FIG. 16, the vent 110 (see FIG. 11) at the bottom of the support vent 108 is disassembled and removed 160.
As shown in FIG. 17 as the fifth stage, the large lift lowering device 105 is reduced by 2.8 meters, and the lower end portion of the support vent 108 and the upper surface of the gantry 102 are connected by bolts. The lift of the large lift lowering device 105 is 0.2 meters high.

As a sixth stage, as shown in FIG. 18, the large lift lowering device 105 is further reduced by 0.2 meters to form a 0.2 meter gap 180 between the lower end of the lowering vent 103 and the upper surface of the gantry 102. . The lift of the large lift lowering device 105 is 0 meter.
As a seventh stage, as shown in FIG. 19, the vent 109 at the bottom of the descending vent 103 (see FIG. 11) is disassembled and removed 190.

As shown in FIG. 20, as the eighth stage, the large lift lowering device 105 is extended by 2.7 meters, and the lower end of the lowering vent 103 and the upper surface of the gantry 102 are connected by bolts.
Thereafter, the first to eighth steps are repeated to lower the pier 100, and when the pier 100 is in the state shown in FIG. 21, the remaining part of the pier 100 is removed by placing it on a vehicle with a small crane. To do.

An embodiment according to the third invention will be described.
FIG. 22 shows a side view of a device configuration according to the embodiment of the third invention. A bridge girder 221 is placed on the pier 220 to be removed. Similar to the second embodiment, a descending vent 222, a large lift lowering device 223, and a supporting vent 224 are installed. The bridge girder 221 is supported by a vent 225. FIG. 23 shows a side view of the pier 220 to be removed as seen from the longitudinal direction of the bridge girder 221.

  In this embodiment, the pier 220 is removed by the method described in the second embodiment. At this time, the bridge girder 221 is supported by the vent 225 so as to keep the same state. A new pier is constructed after the pier 220 is removed. The vent 225 is removed after the new pier is completed.

It is a side view of the apparatus structure concerning the Example of 1st invention. It is sectional drawing which looked at the descent | fall vent of FIG. 1 and the large lift descent apparatus from the longitudinal direction of the bridge girder. It is sectional drawing which looked at the support vent of FIG. 1 from the longitudinal direction of the bridge girder. It is a side view of the 1st step concerning the 1st invention. It is a side view of the 2nd step which concerns on 1st invention. It is a side view of the 3rd step concerning the 1st invention. It is a side view of the 4th step concerning the 1st invention. It is a side view of the 5th step concerning the 1st invention. It is a side view of the 6th step concerning the 1st invention. It is a side view of the final stage which concerns on 1st invention. It is a side view of the apparatus structure concerning the Example of 2nd invention. It is the side view which looked at the pier of FIG. 11 from the side. It is a side view of the 1st step concerning the 2nd invention. It is a side view of the 2nd step which concerns on 2nd invention. It is a side view of the 3rd step concerning the 2nd invention. It is a side view of the 4th step concerning the 2nd invention. It is a side view of the 5th step concerning the 2nd invention. It is a side view of the 6th step concerning the 2nd invention. It is a side view of the 7th step concerning the 2nd invention. It is a side view of the 8th step concerning a 2nd invention. It is a side view of the final stage which concerns on 2nd invention. It is a side view of the apparatus structure which concerns on the Example of 3rd invention. It is sectional drawing which looked at the pier of FIG. 22 from the longitudinal direction of the bridge girder.

Explanation of symbols

10, 221 Bridge Girder 100, 220 Pier 13, 103, 222 Descent Vent 15, 105, 223 Large Lift Descent Device 17, 108, 224 Support Vent 16, 109, 110, 225 Vent

Claims (3)

Combining a lowering vent composed of a plurality of vents installed on the upper part with a large lift lowering device for lowering the bridge girder and a supporting vent consisting of a plurality of vents for supporting the bridge girder on the lower surface of the bridge girder,
Extending the large lift lowering device and levitating the lower end of the support vent,
Removing the lowermost vent of the support vent;
Reduce the large lift lowering device to ground the lower end of the support vent,
Float the lower end of the descending vent by reducing the large lift lowering device,
Removing the lowermost vent of the descending vent;
A method for removing a bridge girder, wherein the large lift lowering device is extended to ground the lower end of the lowering vent. Combining a descent vent with a large lifting device for lowering the pier at the top and a support vent for supporting the pier to the upper side of the pier,
Cut below the pier in the horizontal direction,
Extending the large lift lowering device and cutting in the horizontal direction at the upper position from the cut position,
Extending the large lift lowering device to lift the lower end of the support vent and remove the cut pier,
Removing the vent at the bottom of the support vent;
Reduce the large lift lowering device to ground the lower end of the support vent,
Float the lower end of the descending vent by reducing the large lift lowering device,
Removing the vent at the bottom of the descending vent;
A method for removing a pier, comprising extending the large lift lowering device and grounding a lower end of the lowering vent. In the method for removing the pier according to claim 2,
Leave the bridge girder on the pier,
A vent for supporting the bridge girder is installed on the lower surface of the bridge girder,
After removing the pier, build a new pier,
A method of removing a pier, wherein the vent is removed after the new pier is completed.

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