JP2585682B2 - Girder for bridge erection - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bridge erection girder used for transporting an erection machine or the like used for erection of a bridge.

BACKGROUND OF THE INVENTION Generally, an installation girder used for erection of a bridge mounts a bridge construction member (a PC girder for construction, etc.) on a transport trolley, lifts it at a predetermined position, and transports it to a predetermined erection location. Etc., and there are various uses of the erected girder as a traveling path.

The present invention relates to the improvement of such an installation girder. According to the invention, it is possible to improve the safety of the traveling work and the like and to reduce the cost of the installation girder having the above function.

[Prior art] Conventionally, a bridge construction PC has been used as a bridge erection device.
There is generally known a so-called upper road type erection device in which a girder or the like is carried on an erecting girder and transported, and then a PC girder or the like conveyed to a predetermined position is lifted by a portal type erecting machine and installed at a predetermined installation position. I have.

This equipment is safe because the building PC girder is extremely long and its width is narrow, so the building PC girder that sways is moved without hanging on the pier. Bridge construction work can be performed.

However, in the so-called road-type erection device,
The erection machine (portal erection machine) originally installed for the purpose of safe work such as transporting the PC girder for construction must be moved and installed according to the erection state of the bridge, but the moving installation is a major problem And it was.

That is, as shown in FIG. 1, FIG. 3, etc., when the portal-type erection machine 4 is placed on the transport trolley 5 on the erection girder 2, and transported to the next pier 3 or pier 8, Construction machine 4
And the overall center of gravity of the transport vehicle 5 is extremely high and unstable, so that it may roll over even under the influence of a slight wind.

As a countermeasure against this rollover accident, a jack
A lifting device such as 17 is provided, and the jack 17 is lowered at a location where the side legs 8 are dodged, and the gate-shaped erection machine 4 is lowered by the amount of the jack 17 to be lowered, and its stability is increased, or in the state described above. In addition, countermeasures are taken to lower the overall center of gravity even slightly by placing a counterweight on the transport vehicle 5.

However, none of these measures can be said to be perfect at the end, and measures from the viewpoint of safety of construction work have been desired.

[Purpose of the Invention] The present invention has been made in view of the above-mentioned conventional problems, and in order to stabilize the traveling property when transporting a erection construction member on a transport trolley, In general, there are two ideas, that is, lowering the center of gravity or increasing the distance between rails on which the transport trolley travels, that is, increasing the supporting distance. The present invention was created based on the latter technical idea. It is a thing.

In other words, it is desirable that the width of the erection girder used for transporting the structure is as narrow as possible for the purpose of use.However, in general, the erection girder with a width of 1 m to 1.5 m is considered to be able to satisfy the transportation traveling such as the PC girder for bridge construction. Girder is used, and the rail width laid on the upper surface is 0.8 m
Or 1.2m.

Accordingly, the present invention provides an auxiliary rail that is temporarily allowed when the bridge-type PC girder or the like is transported and laterally moved, and after the work is completed, the portal-type erection machine is moved to the next pier. It is another object of the present invention to provide an installation girder that can move the portal-type installation machine safely and promptly.

[Constitution of the Invention] A bridge erection girder according to the present invention is a bridge erection girder in which a transport trolley rail of a bridge erection construction member is laid on an upper surface of a girder main body that extends long, and both sides of the girder main body. On the surface, an auxiliary rail is laid out on an overhanging member which projects outwardly from the both side surfaces and which is foldable on the both side surfaces.

[Embodiments of the Invention] The present invention will be described below based on embodiments shown in the drawings.

First, an installation state of PC girder 1 as one embodiment will be described.

As shown in FIG. 2, the bridge erection girder 2 assembled on the rear side is sent forward, and at the same time, the portal erection machine 4 is assembled on the pier 3 erected in advance at a predetermined interval on the front side. For this purpose, the portal-type erection machine 4 is prepared so as to be able to be moved to the delivery section 6.

Next, the bridge erection girder 2 sent forward is placed on the pier 3 via the height adjusting member 18, and from this state, the front portal type erection machine 4 is placed on the carriage 5 on the girder 2 and transported. Then, it is installed on the pier 3 (see FIG. 4 (A)).

In the feeding section 6, a portal type erection machine 16 located at the rear is assembled and installed.

Then, as shown in FIG. 4 (A), the girder 2 is again sent forward by a small width, stopped at a predetermined installation position of the sending portion 6 and the pier 3, and the suspension device of the front and rear portal-type erection machines 4, 16 is stopped. At 19, the girder 2 is lowered to a predetermined position and installed.

From this state, the PC girder 1 is carried on the girder 2 as shown in FIG. 5, and the work of erection of the PC girder 1 is started.

Next, as shown in FIGS. 7 (A) and 7 (B), rails 7 are laid on the installed PC girders 1..., And the PC girders 5 are placed on the rails 7.

Then, the trolley 5 is used to suspend the girder 2 at the rear portion thereof, and the suspension is passed over the laid rail 7 and sent to the front pier 8 (see FIG. 7 (B)).

The girder 2 sent to the front pier 8 is installed at a predetermined position, and the remaining PC girder 1 is transported and erected using the rails 7 installed on the PC girder 1 that has already been installed ( (See FIGS. 8A and 8B).

Therefore, as shown in FIG. 9 (B), the installation of the PC girder 1 of the span from A1 to P1 is completed.

Thereafter, as shown in FIGS. 10 (A) and 10 (B), the front portal erection machine 4 is transported to the pier 8 side by using the girder 2.

In addition, the rear gate-shaped erection machine 16 has a plurality of PCs
It is transported using girder 1 ... and installed on pier 3.

Next, as shown in FIG. 11, the installation of the PC girder 1 of the span from the pier 3 to the pier 8 is started (see FIG. 11).
(See FIG. 10 (C)).

By the way, according to the present invention, FIG.
In addition, the present invention relates to the transportation of the front portal erection machine 4 shown in FIG. 10 (A), and the front portal erection machine 4 moves the center of gravity when moving on the narrow bridge girder 2 for bridge construction. If the erection machine 4 is moved at a high position, obstacles such as overturning or overturning occur.

Therefore, in the present invention, on both side surfaces of the bridge erection girder 2, projecting members 12 are provided which project outward and are foldable on both side surfaces.

Further, auxiliary rails 15, 15 having a wider rail and higher stability are laid on the overhang member 12 (FIG. 1,
(See Fig. 12).

That is, as shown in FIG. 12, existing transporter rails 11, 11 are laid on the upper surface of the girder main body 10 which extends long.

The rail width is set at a distance of 0.8 m to 1.2 m as described above. On both side surfaces of the girder main body 10, overhang members 12 are provided. One embodiment of the structure of the overhang member 12 will be described.
The connecting portion 13 has a support member 14 for the overhanging member 12.
. Are mounted rotatably.

An auxiliary rail 15 is laid on the upper surface of the overhang member 12, and a rail width between the auxiliary rails 15 is 15 to 2.5 m. That is, as described above, when the front gate-type erection machine 4 is moved and transported, the erection girder 2
Because the stability is poor at the rail spacing of the transport trolley rails 11 provided on the upper side, the overhang members 12, 12 are extended outward from both side surfaces, and the auxiliary rails provided on the overhang members 12, 12 are provided. The transport trolley 5 is placed on 15 and 15, and the portal erection machine 4 is placed on the transport trolley 5 for transport.

With such a transporting method, the portal type erection machine 4 can be prevented from overturning or overturning at the time of moving, and a moving method with extremely high stability can be obtained.

Further, after the movement of the gate-shaped erection machine 4 is completed, the projecting members 12, 12 projecting outward on both side surfaces of the erection girder 2 can be folded with the connecting portion 13 as a fulcrum (fourteenth). See figure).

By folding in this manner, the projecting members 12, 12 do not become an obstacle during the work of erection of the PC girder 1.

[Effects of the Invention] The present invention has the above-described configuration, and the bridge girder according to the present invention has extremely high stability and cost in moving and transporting the portal-type erection machine 4 as compared with the related art. It is possible to provide a bridge erection girder at a lower cost.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a use state of a bridge erection girder according to the present invention, FIGS. 2 to 11 are schematic views showing a procedure for erection of a PC girder, etc. FIG. 12 and FIG. FIG. 14 is a front view, a plan view, and a plan view showing the construction girder, showing a state in which the overhanging member is folded. DESCRIPTION OF SYMBOLS 1 ... PC girder 2 ... Girder for bridge erection 3 ... Bridge pier 4 ... Front gate type erection machine 5 ... Carriage truck 6 ... Delivery part 7 ... Rail 8 ... Bridge pier 10 ... Girder body 11 … Transportation trolley rail 12… Extending member 13… Connecting part 14… Supporting material 15… Auxiliary rail 16… Rear gate-type erection machine 17… Jack 18 …… Height adjusting member 19… Suspension device

Claims (1)

(57) [Claims] A girder main body extending long in the bridge erection direction is provided with a trolley rail of a construction member for erection, and both side surfaces of the girder main body extend outward from the both side surfaces. An overhang member that is foldable and is foldable is attached to both side surfaces, and an auxiliary rail is provided on an upper surface of the overhang member so as to be flush with the existing rail for the carriage. A girder for bridge erection, characterized in that: