JP4719179B2 - Dismantling / removal method of support work and upper support work - Google Patents

Description

  The present invention relates to a method for dismantling / removing a support work such as a protective support work disposed above a road and an upper support work.

Conventionally, when dismantling a support work on a road, it is known to temporarily stop traffic and dismantle and remove the parts constituting the support work with a tow truck.
In addition, when construction is performed using a fixed support in the construction of new bridges, repairs / reinforcement work, etc., when straddling the road in service, girder is transferred between support works (for example, Patent Documents 1 to 5).
Japanese Patent Laid-Open No. 10-204831 Japanese Patent Laid-Open No. 5-295712 JP 2004-316070 A JP 11-293628 A JP 2004-76513 A

In the conventional case, when the girder is passed over the road, it can be built with a tow truck with a short traffic stop at the start of construction, but after the bridge is completed or when repairing or reinforcing the bridge, However, there is a problem that the girder cannot be easily dismantled, and there is a possibility that the traffic stop time may be extended for a long time, so that the construction cost is likely to increase.
An object of the present invention is to provide a method of dismantling / removing a support work and an upper support work that can solve the above-described problems, can reduce the traffic stop time, and can reduce the construction cost. .

In order to advantageously solve the above-mentioned problem, in the dismantling / removal method of the support work of the first invention, after the bridge girder is constructed via the upper support work constructed and supported by the lower support work, A moving cross girder equipped with a moving device is installed so as to protrude from the bridge girder, and a suspension support is suspended from the extended end of the movement cross girder via a jack or a hoisting machine. After the upper support is moved in the direction of the bridge axis while supporting the upper support, the upper support is disassembled and removed.
In the second invention, the dismantling and removal method of supporting coercive Engineering of the first aspect of the invention, after moving the upper支保Engineering in Hashijiku direction, lowering the upper支保Engineering, characterized in that dismantling and removal.
In the upper shoring of the third aspect of the present invention, there is provided a top shoring used for dismantling and removing method of supporting coercive Engineering the first or second aspect of the invention, on the bridge girder, a cross beam for longer movement than the bridge width Hashijiku Provided so as to extend in the direction perpendicular to the bridge axis and to extend from the bridge girder, and suspend the suspension support material from both ends protruding from the bridge girder of each moving transverse via jacks or hoisting machines. The supporting beam in the direction perpendicular to the bridge axis is supported by each suspension support material in the direction perpendicular to the bridge axis, and a vertical beam extending in the direction of the bridge axis is installed on each supporting horizontal beam, and the moving device is installed in the moving cross beam It is characterized by having.

According to the present invention, after constructing the bridge girder through the upper support constructed by being supported by the lower support, installed on the bridge girder so as to project the moving girder equipped with a moving device from the bridge girder, The suspension support is suspended from the overhanging end of the moving cross girder via a jack or a hoisting machine, and the upper support is moved in the direction of the bridge axis while the upper support is supported by the suspension support. When dismantling the upper support work on the road or on the obstacles, disengage the obstacles or the roads in service as much as possible, and away from the obstacles or road in the direction of the bridge axis. Moreover, since it moves to the position away from the road or the obstacle in the direction of the bridge axis, the dismantling / removal work of the upper support can be performed very safely.
In addition, using a bridge girder constructed using the upper support, a moving girder is installed so as to overhang the bridge girder, and a moving device is added to the cross girder. Can be moved in the direction of the bridge axis, moved from the road or obstacle in the direction of the bridge axis, and dismantled / removed.

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

  FIGS. 1 to 7 show an embodiment of the present invention applied when a new bridge girder is installed and then each support work is removed, and will be described in order.

  In particular, FIGS. 1A to 1D, FIGS. 3E to 3F, and FIGS. 5G to 5H are schematic side views showing a process order.

(First step)
(1) As shown in FIG. 1 (a), an obstacle indicated by a road body 2a or a dotted line so as to intersect the bridge axis direction between lower structures 1 such as bridge piers or abutments spaced apart in the bridge axis direction. 2b (hereinafter also referred to as road body 2) is located below the bridge girder 3 to be constructed, except for the portion of the road body 2 between the lower structures 1, and on the ground 4 Assemble the other lower support 5.

(Second step)
(2) From the state shown in FIG. 1 (a), protective support is provided across the bridge axis direction on the upper part of the opposite inner portions of the lower support works 5 and 5 on both sides in the bridge axis direction across the road body 2 etc. An upper support 6 consisting of the work 6a is installed.

  As shown in FIGS. 1B and 2, the protective support 6 a is a pair of parallel H's that are installed on the inner upper side of each lower support 5 so as to extend in the direction perpendicular to the bridge axis. A vertical beam 8 extending in the bridge axis direction is placed over the upper part of each of the support horizontal beams 7 spaced in the bridge axis direction. An upper support 6 that is placed in parallel at a distance in the direction perpendicular to the bridge axis, and each vertical beam 8 is attached to the supporting horizontal beam 7 so as to be disassembled by a bolt, a nut, and the like and integrated, It is assembled by a tow truck.

(Third step)
(3) As shown in FIG. 2, a telescopic support material 9 for supporting the formwork is disposed on the vertical beam 8 to support the formwork 10 and a scaffold (not shown) is provided. 1a. Further, as shown in FIG. 1 (c), an upper fixed support 11 adjacent to the protective support 6a is provided on the lower fixed supports 5 on both sides of the road body 2 and the like. Forms (not shown) are assembled, and reinforcement and PC steel are appropriately arranged, and then concrete is placed to construct a concrete bridge girder 3 as shown in FIG.
The bridge girder 3 is constructed so as to be supported by a support device 12 arranged on the lower structure 1.

  In assembling the protective support work 6a, a member is appropriately suspended and installed using a crane or a tow truck.

  After the bridge girder 3 is completed, the case where the protective support 6a on the road body 2 etc. is disassembled and removed is the point of the present invention, so this portion will be mainly described.

(4th process)
(4) As shown in FIG. 3 (e), the upper fixed support work 11 and the lower fixed support work 5 are left so as to leave the inner lower fixed support work 5a of the lower fixed support work 5 on the road body 2 side, Preferably, a crane or a tow truck is disposed at a position away from the road body 2 and the like, and dismantled and removed.

(5th process)
(5) As shown in FIG. 3 (f) and FIG. 4, the support base 13 is appropriately arranged on the completed bridge girder 3 at intervals in the bridge axis perpendicular direction and the bridge axis direction. On the pair of support bases 13 in the direction, a moving cross girder 14 equipped with a moving device (not shown) is placed, and the moving cross girder 14 is provided so as to project outward in the width direction of the bridge girder 3. A jack 15 such as a center hole jack is attached to both ends of the cross beam 14, and one end side of a suspension support member 16 such as a suspended steel rod is supported on the jack 15 side (in the case of illustration, it is supported by the expansion / contraction piston of the center hole jack). A nut is installed, and one end side of the screw-type suspension support member 16 is supported by the support nut), and the other end side of the suspension support member 16 is mounted so as to support the supporting cross beam 7 in the protective support work 6a. Insert the top of the support frame 17 Connected and fixed so as to support the support nut 18 disposed on the lower side of the upper crosspiece of the frame 17. Further, the moving cross beams 14 are connected and fixed by connecting vertical beams 19 arranged so as to extend in the bridge axis direction.
Further, a traveling wheel 21 is provided below each moving cross beam 14 via an expansion / contraction support portion 20 incorporating a jack, and the traveling wheel 21 is provided in contact with or floating on the bridge girder 3. ing.
(6) After the connection and fixing between the suspension support member 16 and the supporting cross beam 7 are completed, the jack 15 is extended in a state where the connection between the supporting cross beam 7 and the inner lower fixed support work 5a is released to protect the support. The work 6a is lifted from the inner lower fixed support work 5a, and the travel support wheel 20 is extended through a telescopic support section 20 provided with a built-in expansion / contraction support section with a jack in the moving cross beam 14 so that the travel wheel. 21 is seated so as to stretch on the bridge body, the moving cross beam 14 is lifted from the support base 13, and a moving device such as a chill hole or winch is installed on one of the moving cross beam or the bridge body, and the chill hole or winch or the like. One end of the strip fed out from the moving device is connected to the other, and a moving device such as a chill hole or winch is driven to move the protective support 6a in the direction of the bridge axis as shown in FIG. 5 (g). The Place the protective shoring 6a located away from the road and the like 2, the protective shoring 6a, dismantling and removal by an unillustrated crane or tow.
In the above case, when the support base 13 is a telescopic support base, the horizontal support beam 14 is lifted from the support base 13 and moved in the bridge axis direction by shortening the telescopic support base. It may be.
As described above, when the upper fixed support 11 and the lower fixed support 5 are removed around the road body 2 and the like, the dismantling / removing work can be easily performed by moving the protective support 6a. it can.

  In the above case, as shown in FIG. 5 (h) and FIG. 7, the protective support 6a is lowered and disassembled / removed on the ground as shown in FIGS. It may be dismantled and removed while taking it with a tow truck.

FIG. 7 shows a form in which the protective support 6a is lowered, and an electric chain is provided below the end of the moving cross beam 14 adjacent to the suspension support member 16 such as a suspension steel bar and the jack 15 such as a center hole jack. A hoisting machine 22 such as a block is installed, and the lower end portion of the strip 23 as a suspension support member fed out from the hoisting machine 22 is connected to a support frame 17 attached to the supporting horizontal beam 7 or a connecting jig fixed thereto. The suspension support member 16 such as a suspension steel bar and the jack 15 such as a center hole jack are removed, and in this state, as shown in FIG. The supporting horizontal beam 7 may be lowered.
As shown in FIG. 7, a hoisting machine 22 such as an electric chain block is installed below the end of the moving cross beam 14, and the lower end of the strip 23 fed out from the hoisting machine 22 is attached to the supporting horizontal beam 7. In the form connected to the supporting frame 17 or the connecting jig fixed thereto, the supporting beam 16 can be supported in the same manner as the supporting member 16 such as a suspended steel bar and the jack 15 such as a center hole jack. The suspension support member 16 such as a rod and the jack 15 such as a center hole jack may be omitted.

  The moving cross beam 14 on the bridge surface is a cross beam in which two H-shaped steels are arranged in parallel at intervals and integrated by a connecting member (not shown). It arrange | positions so that the suspension support material 16 which consists of a suspension steel rod may be penetrated between steel.

  The form of moving the cross beam 14 for movement may be of a wheel type as shown in the figure, or it is for movement by interposing a thing with a small friction coefficient such as a tetrafluoroethylene plate on the bridge body. The cross beam 14 may be slid on a bridge body or a support portion on the bridge body.

In addition, when combining H steel such as a horizontal beam for movement or a vertical beam 19 for connection, it is arranged on a support base on a bridge girder (bridge body) 3 rather than being assembled on a moving device having wheels. However, it is easier to assemble it, and it is easier to move it by lifting it up with an upper jack. For the movement, a chill hole or winch or the like may be fixed to the bridge body, and one end thereof may be fixed to the moving cross beam 14.
When dismantling / removing the protective support 6a, if there is a work space at a position away from the road body 2 etc. as in the above embodiment, it is more efficient and safer to dismantle / remove the work after lowering it. It is desirable because it is possible.

(A) is a schematic side view showing a state where lower fixed support works are assembled on both sides of a road between piers, (b) is a schematic side view showing a state where protective support works are assembled between lower fixed support works, (c) ) Is a schematic side view showing a state where the left and right upper fixed support works and the central support support work are assembled from the state of (a), and (d) is using the upper fixed support work and the mobile support work. It is a schematic side view which shows the state which constructed the new bridge girder between piers. It is a vertical front view in FIG.1 (d). (E) After completion of the bridge girder, the left and right upper fixed support works are removed, and the lower fixed support work is removed while leaving a part of the lower fixed support works. (F) It is a schematic side view which shows the state which installed the jack and the suspension support material, and supported the upper support work while constructing the horizontal beam for a movement on the constructed bridge girder. It is the figure which expands and shows the vertical front view in FIG.3 (f), and the one part expansion-contraction support part. (G) is a schematic side view which shows the state which is moving the upper support work to a bridge axis direction, (h) is a schematic side view which shows the state which has suspended the upper support work. (A) is a partially longitudinal side view showing the vicinity of the moving girder and the suspension support material in an enlarged manner, and (b) is a partially longitudinal side view showing the enlarged movement girder and the vicinity of the constructed bridge girder. . It is a general | schematic longitudinal cross-sectional front view which shows the form which installed the winding machine in the crossing girder for a movement and supported the horizontal beam for support so that raising / lowering was possible.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Substructure 2 Road body or obstacle 3 Bridge girder 4 Ground 5 Lower support work 5a Inner lower support work 6a Protection support work 6 Upper support work 7 Supporting horizontal beam 8 Vertical beam 9 Telescopic support material 10 for formwork support DESCRIPTION OF SYMBOLS 11 Upper fixed support 12 Support apparatus 13 Support stand 14 Moving cross girder 15 Jack 16 Suspension support material 17 Support frame 18 Supporting nut 19 Connection vertical beam 20 Telescopic support part 21 Traveling wheel 22 Winding machine 23 Strip

Claims (3)

After constructing the bridge girder through the upper support constructed by the lower support construction, install a moving cross girder with a moving device on the bridge girder so as to extend from the bridge girder . The suspension support is suspended from the overhanging end via a jack or hoist, and the upper support is moved in the direction of the bridge axis while the upper support is supported by the suspension support, and then the upper support is disassembled and removed. Dismantling / removal method of support works.   The method of disassembling / removing a support work according to claim 1, wherein after the upper support work is moved in the direction of the bridge axis, the upper support work is lowered, disassembled and removed. A top shoring used for dismantling and removing method of claim 1 or 2 supporting coercive Engineering extension, on girder, the bridge axis perpendicular with spaced long moving crossbeam than the bridge width Hashijiku direction The suspension supports are suspended from both ends projecting from the bridge girder of each moving horizontal girder via jacks or hoisting machines, respectively. An upper support construction characterized in that a supporting beam in a direction perpendicular to the bridge axis is supported, a vertical beam extending in the direction of the bridge axis is installed on each supporting beam, and the moving beam is provided with a moving device. .

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