JPH0681845B2 - Erection work vehicle for bridge - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bridge erection work vehicle used for construction of a bridge girder constructed while projecting from a pier.

(Problems to be solved by the invention) Conventionally, the erection work vehicle used for construction of the Davidark construction method or cable-stayed bridge, which is constructed by projecting the bridge girder from the head of the pre-built bridge pier at regular intervals, runs on the bridge girder. A beam or the like is erected from the frame assembled on the traveling device so as to extend in the width direction of the bridge girder, and the scaffold or the formwork is suspended and supported from the beam or the like while straddling the bridge girder.

This structure is adopted for the purpose of suppressing the overturning moment acting on the work vehicle as much as possible, but when the construction target is a cable-stayed bridge, the frame protruding in the width direction from the bridge girder is erected during the construction of the diagonal members. Or it becomes an obstacle when removing the work vehicle,
Especially when dismantling, special operations such as disassembling the frame and beams are required.

This invention was made by paying attention to the problem of a conventional erection work vehicle, which projects in the width direction from a bridge girder, and proposes a work vehicle with a structure that does not affect diagonal members and has good stability when moving forward and backward. It is a thing.

(Means for Solving the Problem) According to the present invention, a suspension member that is suspended from the tip of a main frame that is assembled on a traveling device that can travel on a bridge girder, and a suspension member that penetrates through a constructed bridge girder and is suspended from the rear of the main frame. By supporting the work scaffolding at two points on the suspension material, the moment that acts on the main frame when the main frame supports the work scaffold only at its tip is offset, and the main frame is accommodated within the width dimension of the bridge girder. The structure is such that no moment acts on the main frame, and the influence on the diagonal member of the main frame is eliminated, allowing it to move back and forth regardless of the presence or absence of the diagonal member.

Further, by placing the formwork supporting work arranged on the work scaffold on a guide device fixed to an intermediate portion on the work scaffold and engaging the guide device upward, most of the load of the work scaffold is guided by the guide device. The load will be directly applied to the already constructed bridge girder via the bridge to reduce the load on the main frame at all times, to reduce the scale and to increase the distance of one construction section by the work vehicle. While the main frame is moving forward, the supporting material for supporting the formwork support, which will be described later, and the work platform are supported by the bridge girder, and the guide device guides the formwork support work relative to the mainframe. It is possible to retreat, and the load that the main frame bears from the time of advancing the main frame to the time of suspending the suspension material at the rear position of the main frame is also reduced.

The formwork support is movable in the length direction of the bridge girder relative to the work scaffold by being guided by the guide device, and moves independently of the main frame when the main frame moves forward and backward, and moves with the main frame. By doing
Avoid uneven load on the main frame. The main frame moves forward every time a bridge girder for one construction section is constructed,
It is possible to move the main frame forward by moving it back to the main frame by the guide device while the form frame support is supported on the bridge girder immediately after the construction is completed. A situation in which the stability of the main frame is impaired due to the load of the frame support work acting on the front of the main frame before fixing is avoided, and the stability of the main frame is secured.

In addition to supporting the work scaffolding at two locations, in front of and behind the main frame, a suspension material that hangs through the tip of the bridge girder that has already been constructed with formwork support is newly constructed.
By supporting the suspension through the bridge girder position before construction and suspending it from the front of the main frame, the balance of the main frame when moving the form support from the bridge girder after moving the main frame forward It is possible to maintain.

The main frame is assembled in a truss shape on traveling devices installed side by side in the width direction on the bridge girder, and the working scaffold is supported by the main frame by the leading end of the main frame and a suspension member suspended from the rear.

(Example) The present invention will be described below with reference to the drawings illustrating an example.

The erection work vehicle W of the present invention is a traveling device installed in parallel in the width direction on an already constructed bridge girder G as shown in FIG.
1,1 and the main frame 2,2 on which the tip side overhangs the traveling device 1,1 to be assembled, and the main frames 2,2
A suspension member 3 suspended from the tip, a work scaffold 4 supported by a suspension member 3 ′ penetrating the constructed bridge girder G and suspended from the rear of the main frames 2 and 2, and fixed to an intermediate portion on the work scaffold 4. The lower formwork 6a, which is supported by the guide device 5 that is located on the guide device 5 and that is hung from the guide device 5 and that is suspended from the bridge girder G that has already been constructed, and the suspension member 7 that is suspended from the front of the main frames 2, 2. It is composed of an integrated form supporting member 6 and is moved every time a bridge girder G is constructed for a certain section while successively projecting from the head of a bridge outline (not shown).

The traveling device 1 is laid on the bridge girder G in the direction of construction and is composed of a rail 1a temporarily fixed to the bridge girder G and wheels 1b and 1b mounted on the rail 1a at a distance from each other. The rear wheel 1b is Mount on the rail 1a so as to resist lifting.

The main frame 2 is connected to both wheels 1b, 1b, and the front wheel 1
Beam 2a protruding from b in the traveling direction, bundle 2b standing upright on front wheel 1b, and diagonal members 2c and 2c forming truss with them.
The working scaffold 4 is suspended and supported by the main frame 2 by suspending members 3 and 3 ′ assembled from the main frame 2 and suspended from the front and rear of the main frame 2. The rear suspension member 3'is connected to the work scaffold 4 through the constructed bridge girder G as shown in FIG.

The opposing main frames 2, 2 are connected by tie members 2d, 2d as shown in FIG. 1-II. The left side of the center line in FIG. 1-II shows the elevation of the I-X line and the right Y-Y line.

A guide device 5 for reciprocating the form support material 6 with respect to the work scaffold 4 is fixed to an intermediate portion on the work scaffold 4. The formwork support 6 is located on the guide device 5 and is movably connected to the guide device 5 in the longitudinal direction of the bridge girder G while being engaged with the guide device 5 upward. The formwork support 6 is also a suspending member 7 that hangs through the bridge girder G from the upper surface of the tip portion of the constructed bridge girder G.
Then, it is supported by a suspension member 7'which is newly constructed and penetrates through the position of the bridge girder G before construction and is suspended from the front of the main frame 2.

As will be described later, the suspending member 7 ′ is suspended from the front of the main frame 2 when pouring concrete, and from the bridge girder G immediately after pouring when the main frame 2 is moving forward.

An upper formwork 8 forming a cavity of the bridge girder G is suspended above the formwork support work 6.

The form supporter 6 is reciprocally movable with respect to the work scaffold 4 by being guided by the guide device 5, and by connecting the form supporter 6 to the guide device 5, Most of the load is directly applied to the constructed bridge girder G. In addition, as will be described later, when the main frame 2 is moved forward, the guide frame 5 is supported while the formwork support 6 bears a part of the load of the work scaffold 4 and is supported by the bridge girder G by the suspension members 7, 7 '. Since the vehicle is guided by the main frame 2 and moves backward relative to the main frame 2, the load on the main frame 2 until the rear suspension member 3'is suspended is reduced.

As a result, most of the load of the work scaffold 4 is applied to the wheel 1b at the intermediate position of the main frame 2, the upward reaction force to the rear wheel 1b is reduced, and a state in which a moment is not applied to the main frame 2 is obtained.

As a result, the main frame 2 can bear a part of the weight of the work platform 4 and the form support 6 and the weight of the newly constructed bridge girder G in the total weight of the erection work vehicle W. Will be enough.

Here, the procedure of forward operation of the main work vehicle W will be described with reference to FIG. 2 showing an example of construction of a cable-stayed bridge.

First, after arranging the upper formwork 8 and the formwork supporter 6 at predetermined positions,
Pour concrete (I). At this time, the form support material 6
Hangs from the front of the main frame 2 and the suspending material 7 that hangs through the bridge girder G from the intermediate position of the main frame
It is supported by a suspension member 7'which penetrates the concrete to be placed.

After the concrete is hardened, the upper formwork 8 and the formwork supporter 6 are removed from the mold, and at the same time, the diagonal member C of the cable-stayed bridge is erected and the hanging member 7 '
Is separated from the main frame 2, and the form support 6 is supported as it is on the concrete at the tip of the cured bridge girder G (I
I), rollers 9,9 'for receiving the formwork support 6 on the work scaffold 4.
Is installed to advance the main frame 2, the traveling device 1 and the work scaffold 4 (III). At this time, the formwork support 6 is still supported by the bridge girder G by the suspension members 7, 7'as described above.
The balance of the main frame 2 is caused while the bridge girder G bears a part of the load of the work scaffold 4 until it is retracted relative to the main frame 2 by the guide device 5 and the suspending member 3 ′ is suspended. To maintain.

Subsequently, the form supporter 6 is separated from the concrete and moved forward (IV). At this time, the load of the form supporting member 6 acts on the front side of the main frame 2, but the main frame 2 is supported by the front and rear suspension members 3, 3'and, at the same time, is fixed to the bridge girder G. The stability of the main frame 2 is not impaired, and the balance of the main frame 2 during movement of the form support 6 is maintained.

Subsequently, the procedure from I to V is repeated, in which the main frame 2 of the formwork support 6 and the bridge girder G are connected with the suspension members 7, 7'and the process returns to I (V), and concrete is poured. Bridge girder G is built.

Next, the procedure for retracting the erection work vehicle W will be described with reference to FIG.

After the final concrete placing of the bridge girder G is completed (I), the upper formwork 8 and the formwork support 6 are demolded, and after the installation of the diagonal member C is completed, the rollers 9 and 9'are worked. It is installed on the scaffold 4, and the formwork support 6 is separated from the mainframe 2 (II).

Next, the mold support 6 is retracted to dismantle the upper mold 8 and removed. Here, the form supporting member 6 is supported on the bridge girder G by the suspension members 7, 7 ', and the reaction force receiving roller 10 is installed behind the work scaffold 4 (II).

Then, with the work scaffolding 4 supported by the formwork support 6, the suspending members 3, 3'are temporarily removed, the work scaffolding 4 is separated from the main frame 2 and retracted (IV), and the work scaffolding at this position is performed. 4 is supported on the bridge girder G by suspension members 3, 3 ', and the formwork support 6 and the main frame 2 are retracted (V).

Here, the main frame 2 is completely separated from the work scaffold 4 and can be retracted independently, and the erection work vehicle W is removed while repeating the procedure from IV to V below.

(Advantages of the Invention) The present invention is as described above, and since the work scaffold is added from the front of the main frame and the structure is configured to support the bridge girder from the rear through the constructed scaffold, stability of the main frame can be obtained. From now on, it is not necessary to project members in the width direction of the bridge girder, and the main frame can be freely advanced and retracted without colliding with the diagonal members of the cable-stayed bridge.

Also, much of the load on the work scaffolds is applied to the bridge girder by the guide device through the form support, and even when the main frame moves forward, it is guided by the guide device and the form support is relatively retracted with respect to the main frame. Since the work scaffold is supported by the bridge girder, the load that the main frame bears can always be reduced. As a result, the scale of the main frame can be reduced, the distance of one construction section can be extended, and the construction can be rationalized and the construction period can be shortened.

Furthermore, since the formwork support moves in the longitudinal direction of the bridge girder relative to the work scaffold independently of the main frame by being guided by the guide device, the work load on the work scaffold can be biased to the main frame. Rather, the stability of the mainframe can be ensured.

In addition to supporting the work scaffolding at two locations, in front of and behind the main frame, a suspension material that hangs through the tip of the bridge girder that has already been constructed with formwork support is newly constructed.
Since it is supported by a suspension material that passes through the bridge girder before construction and hangs from the front of the main frame, balance of the main frame when moving the form support from the bridge girder after moving the main frame forward Can be maintained.

[Brief description of drawings]

FIG. 1-I is an elevation view showing an example of assembly of the present invention, II is a side view thereof, FIGS. 2-I-V are elevation views showing the way forward of an erection work vehicle, and FIG. IV are also elevation views showing the manner of retreat. G ... Bridge girder, C ... Slanting material, W ... Erection work vehicle, 1 ... Traveling device, 1a ... Rail, 1b ... Wheel, 2 ... Main frame, 2a ... Beam, 2b ... Bunch material , 2c ...... diagonal member, 2d ...... connecting material, 3, 3 '... hanging material, 4 ... work scaffolding, 5 ... guide device, 6 ... formwork support, 6a ... lower formwork, 7 , 7 '... Hanging material, 8 ... Upper formwork, 9, 9' ... Roller, 10 ... Reaction force receiving roller.

Claims (1)

[Claims] 1. A traveling device that is installed on a bridge girder that has already been constructed and is spaced apart in the width direction thereof, and that can travel on the bridge girder.
On this traveling device, the main frame is assembled in a truss shape with the tip side protruding from the traveling device, the suspension material suspended from the tip of the main frame and the suspension material suspended from the rear of the main frame through the constructed bridge girder. Supported,
A work scaffold located below the bridge girder, a guide device fixed to an intermediate part on the work scaffold, and a guide device located on the guide device and engaging with the guide device at the same time as penetrating the tip part of the constructed bridge girder. It is composed of a suspension member that is suspended from the main frame and a new form of support that is supported by the suspension member that is suspended from the front of the main frame. An erection work vehicle for bridges, characterized in that the work platform is guided by the work platform and movably connected to the work platform in the length direction of the bridge girder and supports the work platform through a guide device.