JPH11148111A - Method for erecting bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To erect a bridge by means of only one erection work device with a cantilever erection precast segment method even in the case a span length such as a diagonal tensile bridge, etc., is long, and to quicken the execution as well as the reduction of cost. SOLUTION: In a bridge erection method by means of a cantilever erection precast segment method projecting with a bridge pier as the starting point while providing prestress by connecting bridge precast segments A manufactured in a plant or a yard, an erection nose building work device 1A is constituted of a building girder 2, a leg frame 3 and a segment hang up device 4, and the bridge is erected in a section capable of being orderly projected from the bridge pier to a specific position by the building work device 1A. Then, a additional girder is connected to the building girder 2 of a movable building work device to constitute an erection girder building work device, and the bridge is built in the rest of sections incapable of being orderly projected by the building work device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of erection of a bridge by a cantilever erection precast segment method which balances around a pier, and alternately or simultaneously joins precast segments of a bridge girder and projects while applying prestress. In particular, the present invention relates to a bridge erection method that is effective for erection of side spans in a bridge having a long span such as a cable-stayed bridge or an extra-dosed bridge.

[0002]

2. Description of the Related Art As a typical erection method of the precast segment method, a cantilever erection method in which a bridge is balanced at the center of a bridge and alternately or simultaneously joined to a bridge girder precast segment to protrude while giving prestress (balanced method). There is a cantilever method, for example, and the following method is adopted depending on the difference of the erection work device.

(1) Election nose method (Japanese Patent Application No.
In the normal overhanging construction, a method of closing at the center of the span is generally used from the viewpoint of the bridge girder cross-section force, economy, etc., and an erection nose (moving construction work vehicle) as shown in FIG. ) 50, the main girder is being constructed while balancing the left and right with two election nose from the pier. In the side span on the right side of the drawing, a separate lifting machine 51 is prepared and installed from the end pier to the vicinity of the center of the span using another facility such as a shoring 52. When a shoring cannot be installed, a pillar column (temporary column) is erected and supported by a cable.

(2) Election girder system (Japanese Patent Application Hei 6
This method is used when it is not possible to directly transport the bridge girder precast segment to the site in the case of side span erection, etc. Usually, as shown in FIG. 9 (b), the erection girder 60 is used. It is extruded and erected using the existing bridge girder of another span.

[0005]

When the erection nose method is applied to the side span of a sloped bridge or the like to which the present invention is applied, a section in which extension is impossible (a section in which a pier, a pillar, etc. In (1), a bridge girder precast segment must be lifted and joined using a mobile crane or a shipboard crane, which is costly and cannot be performed quickly.

In the case of the erection girder system, if the erection girder cannot be installed at one time, a space for assembling and pushing is required, and the bridge girder is passed around each pier as a fulcrum. At least the length of the span is required, and if the span is long, such as a cable-stayed bridge, it will not be possible to extrude in the usual way. For this reason, it is necessary to install the erection girder up to the span where the erection girder can be extruded by using other equipment such as an erection nose, which is costly and cannot be performed quickly.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a single cantilever installation device using only one installation work device even when a span length is long, such as a cable-stayed bridge. Construction by the precast segment method is possible,
An object of the present invention is to provide a bridge erection method that can reduce costs and speed up construction.

[0008]

In order to achieve the above object, according to the present invention, a cantilever erection that extends from a pier as a starting point while applying prestress by joining a bridge girder precast segment manufactured in a factory or a yard. In the method of erection of a bridge by the precast segment method, an erection nose type erection work device is configured from an erection girder, a leg frame, and a segment lifting device, and the erection work device performs erection from the pier to a predetermined position. A girder is additionally connected to the erection girder of the movable erection work device to form an erection girder type erection work device, and the remaining portion is erected by the erection work device.

Further, when the erection nose type erection work device is changed to an erection girder type erection work device, the girder is lifted using a segment lifting device installed on the erection girder and is additionally connected to the erection girder. The girder to be additionally connected is a girder of unit length, lift this girder and attach it to the erection girder, connect the corners on one side with pins, rotate it 180 ° and connect it to the back of the erection girder, Are preferably repeated to form an election girder.

In the above construction, the stretchable section is erected by an erection nose type erection work device, and is located just before the section where extension is not possible (reverse extension section using a pier, a pillar pillar, etc.). Then, an installation girder is additionally connected to the erection nose type erection work device and sent out, and the erection girder type erection work device is erected in a section where extension is impossible. As a result, even when the span length is long, such as a cable-stayed bridge, erection can be performed by the cantilever erection precast segment method with only one erection work device, and cost can be reduced and construction can be speeded up. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. This is an example in which the present invention is applied to erection of side spans such as a cable-stayed bridge. FIG. 1 shows an example of an erection work device of an erection nose type in a stretchable section of the present invention, and FIG. 2 shows an example of an erection girder method of an erection girder method in a stretchable non-extendable section of the present invention. It is a thing. 3 to 7 show an example of the erection method of the present invention in the order of steps. FIG. 8 shows an example of a method for additionally connecting an installation girder according to the present invention in the order of steps.

An installation work device 1 used in the present invention.
As shown in FIG. 1, it mainly comprises an installation girder 2 of unit length, a pair of leg frames 3 in the bridge axis direction, a lifting device 4 for the bridge girder precast segment A, a pair of work scaffolds 5, and the like. ing.

In the stretchable section at the beginning of the installation, for example, two girder units of unit length are connected to form an erection nose type erection work apparatus 1A. In the section where extension is impossible, the erection work apparatus 1A is used. The girder 2 of unit length is sequentially connected to the erection girder 2 of FIG.
An erection girder type erection work device 1B as shown in FIG.

The erection girder 2 is constructed by connecting a pair of truss girders 2a in a direction orthogonal to the bridge axis, and a pair of leg frames 3 are respectively arranged below the truss girders 2a in the bridge axis direction.

The leg frame 3 is movably installed on a rail girder 6 installed on a bridge girder that has already been erected, and is moved by a moving device 7 composed of a hydraulic cylinder or the like. The upper part of the leg frame 3 and the erection girder 2 can be fixed / unlocked by a lock / unlock device 8. Therefore, if the moving device 7 is operated in a state where the leg frame 3 and the erection girder 2 are fixed, the erection work device 1A of the erection nose type can be moved. In a state where the fixing of the erection girder 2 is released, the leg frame 3 is rearranged and moved by the moving device 7, and then the erection girder 2 is moved forward by the moving device 7 while the leg frame 3 and the erection girder 2 are fixed. By repeating this, the construction girder 2 can be sent out.

The present invention is not limited to this. A feeder such as an electric roller or a slide jack may be provided between the upper part of the leg frame 3 and the bridge girder 2. It can be installed outside without any equipment.

As shown in FIG. 1, the lifting device 4 includes a crane girder 4a in a direction orthogonal to the bridge axis and two club trolleys 4b.
The crane girder 4a travels on the rail of each truss girder 2a of the erection girder 2 in the bridge axis direction by the traveling device 9. The club trolley 4b can be traversed on the crane girder 4a in a direction orthogonal to the bridge axis by a traversing device 10 such as a hydraulic jack, and can cope with various widths of the bridge girder precast segment A, and has a unit length as described later. Additional connections of the girder 2 can be made easily on the device. In addition, the work scaffold 5 is the construction girder 2
Is movably suspended at the distal end side of the camera.

Using the erection work apparatus having the above-described configuration, erection is performed in the following procedure (see FIGS. 3 to 7). In the drawings, the left side shows the method of erection according to the present invention, and the right side shows the conventional method using an erection nose.

(1) The segment of the head of the pier B (or the cast-in-place construction) and several segments of the overhang portion are erected from the ground by a mobile crane. The bridge girder precast segment A is transported to a erection point using a temporary road or the like by a trailer or another transporter, or by a transport ship.

(2) When the installation place of the temporary work device is secured, the rail girder 6, the temporary girder 2, the leg frame 3, the lifting device 4, the work scaffold 5, etc., using a mobile crane or a shipboard crane on the ground. Is installed on the bridge girder and assembled, Fig. 3
As shown in (a), an erection nose type temporary work device 1A is configured.

(3) The support gantry 11 is removed, the rail girder 6 is replaced as shown in FIG. 3B, and the erection girder 2 is advanced by the moving device 7 for the leg frame 3. As shown in FIG. 3 (c), for example, No.
13 bridge girder precast segments A are lifted and joined. The work of inserting, joining, and tensioning the steel bars is performed using the work scaffold 5. This work is repeated a plurality of times, and the erection work by the erection nose temporary work device 1A is completed.

(4) As shown in FIG. 4B, for example, No. 1
When the joining of the bridge girder precast segment A of No. 6 is completed, a girder of unit length is sequentially connected to the rear of the erection girder 2 of the temporary working device 1A of the erection nose type, and the support gantry 11 arranged at a predetermined interval is added. Support with. This additional connection is performed by the lifting device 4 as described later. This additional connection is not limited to this, and may be performed by a mobile crane on the ground or a crane on board.

(5) As shown in FIG.
Is partially removed, the installation girder 2 is jacked up with the jacks of the remaining support stand 11, and a pair of leg frames 3, 3
Is rearranged.

(6) As shown in FIG. 5 and FIG.
Alternatively, the erection girder 2 is sent forward by using another feeding device, and rearrangement of the pair of leg frames 3 and 3 is sequentially repeated to advance the erection girder 2.

(7) As shown in FIG. 7, the leading end of the erected girder 2 which has been advanced is supported by the vent 12, and the delivery is completed.

(8) In this state, the erection girder type erection work device 1B is hung between the existing bridge girder on the pier B side and the pier C, and as shown in FIG. Is moved forward to transport the bridge girder precast segment A.

The bridge girder precast segment A includes a pier C
Joining by reverse overhang from the side, close at the center between the fulcrums.

In this reverse overhang section, as in the conventional case, as shown in the drawing, the support is sequentially supported by a diagonal member 14 from a pillar column 13 erected on a vent 12, or is supported by a support (not shown).

Next, an additional connection of the erection girder 2 is shown in FIG.
The method is performed as shown in FIG. That is, the lifting device 4 is moved to the center of the erection girder 2, and the truss girders 2a 'of the erection girder 2' to be connected are lifted from this state, and the respective club trolleys 4b are traversed inward.
a 'is attached to the outer surface of each truss girder 2a, and is connected by pins at adjacent corners. Then, the truss girder 2a 'is turned 180 ° rearward around the pin by an appropriate means such as a winch.
Then, the truss girder 2a 'is connected to the back of the truss girder 2a, and the inner corners are connected by a pin to be integrated.

Subsequently, the lifting device 4 is moved onto the connected construction girder 2a ', and the same procedure as described above is repeated to obtain the construction girder 2 having a predetermined length. Next, the construction girder 2 is extruded.

Although the above-described example shows an oblique bridge and the like, it is needless to say that the present invention can be applied to other bridges having a long span.

[0032]

As described above, according to the present invention, an erection nose type erection work device is constructed from an erection girder, a leg frame, and a segment lifting device. Girder is additionally connected to the erection girder of the moving erection work device to constitute an erection girder type erection work device,
Since the remaining section where extension is not possible is installed using this erection work device, even when the span length is long, such as a cable-stayed bridge, only one erection work device can be used for cantilever erection using the precast segment method. It is possible to reduce costs and speed up construction.

[Brief description of the drawings]

FIG. 1 shows an example of an erection nose type erection work device in a stretchable section of the present invention, in which (a) is a plan view, (b) is a side view, and (c) is a front view.

FIG. 2 shows an example of an erection girder type erection work apparatus according to the present invention in a section where extension is impossible, in which (a) is a plan view and (b) is a side view.

FIG. 3 shows an example of the erection method of the present invention in the order of steps (steps 1 to 3).
It is the side view shown to 3).

FIG. 4 shows an example of the erection method according to the present invention in the order of steps (steps 4 to 4).
It is a side view shown to 6).

FIG. 5 shows an example of the erection method of the present invention in the order of steps (steps 7 to
It is a side view shown to 9).

FIG. 6 shows an example of the erection method of the present invention in the order of steps (steps 10 to 10).
It is a side view shown to 12).

FIG. 7 shows an example of the erection method of the present invention in the order of steps (step 13).
It is a side view shown in FIG.

FIG. 8 is a side view, a front view, and a plan view showing an example of additional connection of an installation girder according to the present invention in the order of steps.

9A is a side view showing a conventional erection nose type erection method, and FIG. 9B is a side view showing a conventional erection girder type erection method.

[Explanation of symbols]

 A: Bridge girder precast segment B, C: Bridge pier 1A: Erection nose type erection work device 1B ... Erection girder type erection work device 2 ... Erecting girder 2a ... Truss girder 3 ... Leg frame 4 ... Lifting device 4a ... Crane girder 4b Club trolley 5 Work scaffold 6 Rail girder 7 Moving device 8 Locking / unlocking device 9 Traveling device 10 Traversing device 11 Support base 12 Vent 13 … Pilon pillar 14… diagonal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Ryuichi Hirakawa, 77-1, Motomachi, Fuchu-shi, Hiroshima Inside the Kitagawa Iron Works Co., Ltd. (72) Masasaku Tokunaga 77-1, Motomachi, Fuchu-shi, Hiroshima Kitagawa, Inc. Inside the ironworks

Claims (2)

[Claims] 1. A method of erection of a bridge by a cantilever erection precast segment method, in which a bridge girder precast segment manufactured in a factory or a yard is joined and pre-stressed and extended from a pier as a starting point. An erection nose type erection work device is constructed from the segment lifting device, erection is performed from the pier to a predetermined position by this erection operation device, and then a girder is additionally connected to the erection girder of the movable erection work device by erection. A method for erection of a bridge, comprising a girder type erection work device, and erection of the remaining portion by the erection work device. 2. The bridge erection method according to claim 1, wherein the girder is lifted using a segment lifting device installed on the erection girder, and is additionally connected to the erection girder.