JP2772158B2 - Bridge girder erection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In the construction of a bridge girder such as a viaduct, as shown in FIG.
The girder assembling vents 02, 0 are arranged so that the girder to be erected between the piers 01, 01 constructed as shown in FIG.
2 is temporarily placed, and a girder member 04 is lifted by a ground crane 03 on the adjacent pier 01 and the assembly vent 02,
After assembling and joining the girder member 04 on the assembling vent 02, the assembling vent 02 is disassembled.

[0003]

The above-mentioned prior art has the following problems. In the current method using a truck crane and a vent for assembling, almost all the work of assembling and erection is performed at a high place and includes many risk factors of a crash disaster. In this type of work at high places, skilled workers are working at high places.However, workers are also aging and it is difficult to secure special workers. More measures are needed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to improve the safety by performing this kind of work as low as possible.

[0005]

Means for Solving the Problems A lifting type erection belt is disposed at the nearest position next to the pier, and a bridge girder unit is assembled and supported on the lifting type erection vent at a low height position. The raised vent is raised to a predetermined height, and the bridge girder unit is laid horizontally on the pier from the raised vent to the bridge pier.

[0006]

The lifting type erection vent is installed at a height of the pier (for example, 15 m) from the ground assembly height (for example, 1.5 m above the ground).
m) Any type that can be lifted up to m) is used and arranged next to a pair of piers or three piers. Each lifting erection vent is aligned to a suitably low height, with an appropriate number of assembly vents between each lifting erection vent. A bridge girder unit of a length to be mounted on two piers or three piers is assembled and joined using a crane in a low height operation close to the ground on the erection vent and the assembly vent.

The bridge girder unit that has been assembled and joined is sufficiently temporarily fixed on the erection vent, and the erection vent is raised to a predetermined height position by jacking up or the like. At the rising height, the bridge girder unit will be pulled laterally from the erection vent to the pier using a horizontal jack or the like via a sliding member, etc., and will be installed at a fixed position on the pier.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention and a lifting type erection vent used in the present invention will be described with reference to FIGS. In the figure, reference numeral 1 denotes a pier, and 2 denotes a lifting type erection vent installed side by side with the pier 1. The lifting vent 2 is a jack-up frame 3 installed on the surface of the ground,
1 shows an installation vent 4 which is raised in the same frame 3. The jack-up frame 3 is composed of four guide columns 6 having a U section and having pin holes 5 with a constant pitch on the side wall surface.
A lifting beam 10 supported in a pin hole 5 of each guide column 6 via a vertical pin block 8, 9 of a lifting hydraulic cylinder 7 so as to be liftable, and a vent block 4 for mounting in a frame.
A rail 11 and a carriage 12 for carrying in a are provided, and an installation vent support frame 13 is provided at the upper end as shown in FIG.
The erection vent 4 is a connection body of the vent block 4a unit, the lowermost vent block 4a is coupled to the lifting beam 10, and the lifting beam 10
By alternately connecting the pin blocks 8 and 9 to the pin holes 5, the pin blocks 8 rise from the chain line position 10 'to the solid line position 10 in FIG. 1, and the vent block 4a carried by the carriage 12 is extended below the pin block. The raising operation is repeated, and the lowering and vent dismantling operations are performed by the opposite operations. Reference numeral 15 denotes a bridge girder unit which is supported at the upper end of the erection vent 4 and assembled, and is assembled at a low height near the surface of the pier 1 to be lifted. In the lower part of the bridge girder unit 15 facing the erection vent 4, a chill tank or a sliding material 16
During the assembling, assembling and lifting, the bridge girder unit 15 can be fixed on the erection vent 4 such that the chill tank, the sliding member 16 and the like 16 do not work.

FIGS. 4, 5 and 6 show second, third and fourth embodiments of the present invention which are carried out by using the above-described lifting type erection vent 2. FIG. The second embodiment of FIG. 4 shows a case where a bridge girder 15 is erected between two piers 1 and 1. The lifting-type erection vents 2 and 2 are shown in a state where the bridge girder 15 is assembled on the ground at a height where one vent block 4a is inserted, and shifted sideways from the pier 1 for easy understanding.
If it is provided along with the center of the pier 1, it can be used in the same position even when the bridge girder 15 is installed on the opposite side (to the left or right in the figure). 17 is the required number between the erection vents 2 and 2,
An assembly vent provided at a predetermined height. Bridge girder unit 15
Are connected to the ends of a plurality of girders 15a by joints 15b on the above-described low-height lift-type erection vents 2 and 2 and the assembling vent 17 to assemble them in a state of a chain line 15 '. Bridge girder unit 15 '
As described above, a chill tank or a slide plate 16 is provided on the surface in contact with the erection vent 4, and this is provided with the vent 2.
The bridge girder unit 15 'is sufficiently fixed on the erection vent 4 without directly contacting the upper surface. In the same manner as described in the first embodiment, the two sets of the lifting type erection vents 2 and 2 are raised synchronously in the manner described in the first embodiment, and the bridge girder unit 15 is raised to the same height as the pier 1 [FIG. Dashed line position). The ascending erection vent 4 is connected to the jack-up frame 3
Is supported and guided in the vertical direction by the lifting beam 10 and the vent support frame 13 at the upper end. The erection vent 4 which rises at this time
Can be further maintained vertically by using a wire or the like.

A bridge girder unit 15 raised to the height of the pier 1 in FIG.
Breaks the connection with the erection vent 4 at this position, brings the chill tank or the sliding plate 16 into contact with the vent 4,
It is connected to a horizontal pulling means (not shown) such as a horizontal jack or the like, and is slid and moved on a temporary rail or a slide plate on the pier 1 to be pulled laterally to a fixed position, and is installed on a support on the pier 1.

According to this method, assembling of the bridge girder unit 15 such as mutual alignment of the girder members 15a and connection of the joints can be performed in low-place work on the ground level, thereby eliminating the danger of high-place work and improving work safety. It has the effect that work can be carried out safely without relying on high altitude heatrs. In addition, the work at a high place is only the horizontal pulling work on the pier 1, which reduces the danger and makes the work easier.

Next, a third embodiment shown in FIG. 5 is an embodiment in which a two span continuous bridge girder unit 15 spanning three piers 1 is erected. Three sets of the lifting vents 2 are arranged side by side on each pier 1. Similarly, a plurality of assembling vents 17 are disposed at a height of one vent block 4a, and a height 15 'near the ground is set on the bridge girder unit. Is assembled by three sets of lifting-type erection vents 2, and is horizontally pulled on three piers 1. The procedure, operation, and the like of the lifting horizontal pulling are the same as those of the second embodiment in FIG.

Next, a fourth embodiment shown in FIG. 6 is an embodiment in which a bridge girder unit 15 of three spans continuous over four piers 1 is erected. The erection can be performed in steps (1), (2), and (3) in the figure. Step (1) is a state in which the bridge girder unit (15-1) of the right span is assembled in a low place, raised, and horizontally pulled up to a predetermined position, and step (2) is in the same manner as the sup (1). Bridge girder unit (15
-2) shows a state in which the assembling, lifting, and laterally pulling up to a predetermined position are performed. In step (3), steps (1),
(2) After the work is completed, two sets of lift-type erection vents 2 and 2 are arranged immediately below the gaps of the left and right bridge girder units (15-1) and (15-2) which have been mounted at predetermined positions. Then, the bridge girder unit (15-3) at the center is joined to the ends of the left and right bridge girder unit (15-1) and (15-2) without assembling at a low place, lifting, and pulling sideways. Only the central bridge girder unit (15-3) needs to be joined on a scaffold for working at a high place. However, the same effect as that of the second embodiment can be obtained for the left and right spans.

Also, the dismantling of the lifting-type erection vent 2 can be simplified and facilitated by dismounting the vent block 4a on the ground, repeating the lowering of the erection vent 4 by pulling out and jacking. . The lifting-type erection vent 2 shown in the above-described embodiment is not limited to the illustrated one, and another configuration may be used.

[0015]

According to the method of erection of a bridge girder according to the present invention, a lifting girder erection vent is arranged at the nearest position next to a pier, and a bridge girder unit is assembled at a low height position on the lifting erection erection vent. By supporting and raising the lifting type vent to a predetermined height and laterally installing the bridge girder unit from above the vent to above the pier, the following effects are obtained.

The work of assembling the bridge girder to be mounted at a high place is eliminated, so that the work at a high place when the bridge girder is erected is significantly reduced, and the safety can be improved. In addition, by using the lifting type vent, the work of assembling, disassembling, and relocating the vent is also a ground work, so that the efficiency of the work can be improved. In addition, work can be performed safely without relying on skilled workers at high places.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a front view of a second embodiment of the present invention.

FIG. 5 is a front view of a third embodiment of the present invention.

FIG. 6 is a front view of a fourth embodiment of the present invention.

FIG. 7 is a work explanatory view of a conventional erection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Lift type construction vent 3 Jack-up frame 4 Construction vent 4a Vent block 15 Bridge girder unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masao Murata 5-1 Enamiokicho, Naka-ku, Hiroshima-shi, Hiroshima Mitsui Heavy Industries, Ltd. Hiroshima branch office (56) References JP-B-56-53042 (JP, B2) JP-B-59-8638 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E01D 21/00

Claims (1)

(57) [Claims] 1. A lifting-type erection vent is arranged at a position closest to a pier, and a bridge girder unit is assembled and supported on the lifting-type erection vent at a low height, and the lifting-type erection vent is provided. The bridge girder is raised to the same height as the pier, and a bridge girder unit is laid horizontally on the pier from above the raised vent.