JP2000104222A - Construction method and device for bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lighten operation and reduce equipment cost by allowing a girder block in a suspended state to be lowered and connected to the end of an existing girder without an eccentric load being applied it when the girder block is revolved and dispense with a temporary receiving device to be provided on the end position of a traveling frame. SOLUTION: A bridge is constructed by arranging a revolving type lifting device 4 on an existing girder 2 installed on a stationary section 1 such as an abutment or a bridge pier and successively connecting a girder block 5 to the existing girder 2 by revolving the girder block 5 lifted up of the stationary section 1 side by the revolving type lifting device and moving it to the end of the existing girder 2. The girder block 5 lifted up and retained by the revolving type lifting device 4 is then revolved by centering the girder block 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge erection method and erection apparatus, and more particularly to a bridge erection method and an erection apparatus for an overhang bridge method.

[0002]

2. Description of the Related Art In a strait or river, an overhanging bridge construction method is known as a construction method for bridging a bridge without hindering the navigation of ships on water, and there are known methods using a travel crane or a cable crane.

In this construction method using a travel crane, as shown in FIG. 5, a girder block 2a is sequentially extended from a fixed portion 1a side such as an abutment or a pier, and a travel crane 4a is mounted on the existing girder 3a. And the girder block 2 transported over the water by the travel crane 4a
a and lift it at the level of the existing girder 3a.
In the construction method using a cable crane, as shown in FIG. 6, a cable 2b is stretched between towers 1b, 1b, and a cable crane 3b suspended by the cable 2b is used. The girder block 4b is carried, and is suspended and connected to an end of the existing girder 5b.

However, the construction method using the travel crane or the cable crane requires large crane equipment.

[0005] Therefore, as one of preferred overhanging bridge construction methods replacing the construction method using the travel crane or the cable crane, one disclosed in Japanese Patent Application Laid-Open No. 1-300022 is known.

[0006] The conventional crosslinking method presented in this publication is
As shown in FIG. 7, a swing type lifting device 4c is installed on a traveling frame 3c arranged on an existing girder 2c installed on a fixed portion 1c such as an abutment or a pier.
c, the girder block 5c lifted from the fixed portion 1c side is turned to move to the leading end of the existing girder 2c, and the girder block 5c is mounted on the temporary receiving device 6c provided on the traveling frame 3c.
And a bridge is erected by sequentially connecting the existing girder 2c to the existing girder 2c. The bridge can be bridged by a small and light-weight device.

However, Japanese Patent Application Laid-Open No.
The construction method disclosed in Japanese Unexamined Patent Publication No. 2 (1994) is a turning type lifting device 4c.
When the girder block 5c lifted from the fixed portion 1c side is turned to turn to the tip end side of the existing girder 2c, the center position and the turning of the girder block 5c hung by the turning type lifting device 4c at the time of turning. The center of rotation of the lifting device 4c is eccentric.

Therefore, the spar block 5c is swung when the spar block 5c is turned, and an eccentric load is applied to the spar block 5c. Therefore, the digit block 5c
There is a risk of damage such as distortion inside. In addition, the suspension position may be shifted when turning, and the suspension position is adjusted by temporarily receiving the suspension position on the temporary receiving device 6c provided on the traveling frame 3c.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and is intended for use in turning a girder block suspended from a fixed portion such as an abutment or a pier to a tip end of an existing girder. There is no worry that eccentric load will be applied to the girder block,
It is another object of the present invention to provide a bridge erection method and an erection method that do not require a temporary receiving device or the like provided on the tip side of an existing girder to adjust a shift of a lifting position after turning.

[0010]

Means for Solving the Problems In order to solve the above-mentioned problems, a bridge erection method according to the present invention comprises disposing a revolving type lifting device on an existing girder installed on a fixed part such as an abutment or a pier. In the method of erection of a bridge for erection of a bridge by turning a girder block lifted from a fixed part side by this turning type lifting device and moving to a tip end of an existing girder and sequentially connecting the same, the turning type lifting device The girder block held by lifting is turned around the girder block.

By rotating the girder block held by lifting about this girder block, the center position of the girder block suspended by the revolving type lifting device at the time of turning and the turning center of the revolving type lifting device are adjusted. The girder block is always at the center position when the girder block is turned, so that no eccentric load is applied. Further, since the suspension center does not shift when turning, the suspension can be lowered and connected to the tip of the existing girder as it is.

Further, the bridge erection apparatus according to the present invention is a traveling frame that is movably disposed on an existing girder installed on a fixed part such as an abutment or a pier and can be fixed at an appropriate position. And a swing-type lifting device provided above the traveling frame, and a girder block transfer means for transferring a girder block on the existing girder in a longitudinal direction thereof. Can be turned around the suspended girder block.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIGS. 1 to 4 show a preferred embodiment of the present invention, in which a bridging device is installed on an existing girder 2 installed on a fixed portion 1 such as an abutment or a pier in a longitudinal direction thereof. The first running rails 21 and 21 are fitted to the short first running rails 21 and 21 and can be run.
1, a traveling frame 3 which can be fixed at an appropriate position, a swing type lifting device 4 provided above the traveling frame 3 about a vertical axis, and disposed on the existing girder 2 in the longitudinal direction. And a girder block transfer means 6 for transferring the girder block 5 by a carriage 61 fitted on the second traveling rails 22, 22.

The turning type lifting device 4 provided on the traveling frame 3 comprises a base 41 having a turning device 7 installed on a turntable 71 arranged on the traveling frame 3, Posts 42 suspended on the center line
And a horizontal portion 43 extending horizontally along the base portion 41 at the top of the support column 42.
3 is provided with a traveling carriage 45 on which a lifting winch 44 is suspended so as to be able to travel on a rail 46 extending in the axial direction.

In particular, the lifting winch 44 can be moved to a position where the center position of the lifting winch 44 coincides with the center position of the turntable 71 of the turning device 7 mounted on the base 41.

In the drawings, reference numeral 81 denotes a bonding scaffold movably provided along the existing spar 2, and reference numeral 82 denotes a tensioning scaffold provided below the tip of the running frame 3.

In order to construct a bridge using the bridge device according to the present embodiment, first, as shown in FIG. 4A, the traveling frame 3 on which the swing type lifting device 4 is installed is attached to the end of the existing girder 2. Is moved and fixed at a predetermined position, and the girder block 5 is placed on a carriage 61 constituting the girder block transfer means 6 disposed on the existing girder 2, and is moved on the second traveling rails 22, 22 in the direction of the rotary lifting device 4. Transfer to

At this time, the revolving type lifting apparatus 4 keeps the opposite side of the column 42, that is, the open side toward the base end side of the existing girder 2, that is, the side of the girder block transfer means 6, and revolves the revolving type lifting apparatus. The lifting winch 44 of the device 4 is positioned at the open end of the horizontal portion 43.

The girder block 5 placed on the carriage 61
Is moved directly below the elevating winch 44, the elevating winch 44 is lowered and fixed to the upper part of the girder block 5, and the elevating winch 44 is raised again to lift the girder block 5 (FIGS. 4A and 4B). In B) 2
The state shown by the dotted line).

Next, the traveling carriage 45 with the lifting winch 44 suspended is moved along the rail 46 toward the tip of the existing girder 2, and when the girder block 5 suspended by the revolving lifting device 4 is turned. It stops at the position where the center position and the center of rotation of the swing type lifting device 4, that is, the center of the turntable 71 arranged on the traveling frame 3 overlap (FIG.
(B)).

Next, the revolving type lifting device 4 is revolved 180 ° about the revolving base 71 (see FIG. 4C). At this time, the girder block 5 suspended by the revolving lifting device 4 is always at the center position including the time of revolving. Therefore, no eccentric load due to turning is applied to the girder block 5,
Further, since the suspension center does not shift when turning, the girder block 5 can be moved to the leading end of the existing girder 2 and moved down to be connected as it is (FIG. 4C).
In the state indicated by a two-dot chain line).

When the girder block 5 is connected to the leading end of the existing girder 2, the fixed state between the girder block 5 and the elevating winch 44 is released, and the first procedure shown in FIG. And the next girder block 5 is sequentially erected on the leading end of the existing girder 2.

[0024]

As described above, according to the present invention, a girder block suspended from the base end side of an existing girder by a revolving type hoisting device arranged on the existing girder is disposed on the distal end side of the existing girder centering on this girder block. Since it was decided to turn to, unlike the conventional turning type lifting device, the center position of the suspended girder block when turning and the turning center of the turning type lifting device overlap,
When turning the girder block, the girder block is always in the center position. Therefore, no eccentric load is applied to the suspended girder block.

Also, since the suspension center does not shift when turning, the suspension can be lowered and connected to the tip of the existing girder in the same state. Therefore, there is no need to provide a temporary receiving device at the distal end position of the traveling frame as in the related art, and it is possible to reduce work and equipment costs.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a preferred embodiment of the present invention.

FIG. 2 is a schematic plan view of FIG.

FIG. 3 is a schematic front view of FIG. 1;

FIG. 4 is an explanatory view showing a construction procedure of the embodiment shown in FIG. 1;

FIG. 5 is an explanatory view showing a conventional example.

FIG. 6 is an explanatory view showing a different conventional example.

FIG. 7 is an explanatory view showing still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed part 2 Existing girder 3 Traveling frame 4 Revolving type lifting device 5 Girder block 6 Block transfer means 7 Revolving device

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Ryoichi Yonezawa 1-32-2 Honcho, Nakano-ku, Tokyo Oriental Construction Co., Ltd. Tokyo Branch F-term (reference) 2D059 CC03 CC06 DD03

Claims (2)

[Claims] 1. A swivel type lifting device is arranged on an existing girder installed on a fixed part such as an abutment or a pier, and the girder block lifted from the fixed part side is turned by the swivel type lifting device. A bridge construction method for constructing a bridge by moving to a tip end of the bridge and sequentially connecting the bridge, wherein the girder block suspended and held by the swing type lifting device is turned around the girder block. Erection method. 2. A traveling frame movably disposed on an existing girder installed on a fixed portion such as an abutment or a pier and capable of being fixed at an appropriate position, and a swing provided above the traveling frame. In a bridge erection device provided with a type lifting device and a girder block transfer means for transferring a girder block in the longitudinal direction on the existing girder, the swiveling type lifting device is arranged around the hung girder block. A bridge erection device characterized by being capable of turning.