JPH08209632A - Building method for steel girder - Google Patents

Abstract

PURPOSE: To connect together joint parts quickly and esasily by assembling a bridge dividing into two blocks, by hoisting them with cranes and positioning on the abutments on both banks and over a river, and sending out the adjusting side block by means of a sending facility. CONSTITUTION: Abutments 1a, 1b are built on both banks of a river, and a sending facility 2 is provided on the abutment 1b. A bridge is assembled dividing into the fixed side block 3a and the adjusting side block 3b at the middle part, and they are temporarily placed on both banks in parallel with the river by cranes 4. At first the fixed side block 3a is hoisted and turned by the crane 4 through a lifting beam 41, loaded on the abutment 1a after positioning, and the extreme end side is fixed with traverse wire. Next, the adjusting side block 3b is similarly hoisted, sent by a sending facility 2 after positioning so as to keep a prescribed space against the fixed side block 3a, and hence the joint parts of both blocks 3a, 3b are connected together. After completing connection, both blocks are hoisted, the sending facility 2 is removed, and both blocks 3a, 3b are brought down on the abutments 1a, 1b and installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a steel girder such as a bridge.

[0002]

2. Description of the Related Art In recent years, the necessity for effective use of the sky above existing facilities such as railways, roads, and rivers has been avoided, and labor saving in constructing structures in spaces subject to these restrictions and development of rapid construction methods are urgently needed. Has become.

[0003]

In the conventional method of constructing steel girders, the steel girders divided in two are temporarily placed in parallel along both sides of a river or the like, and they are hoisted to cross the river or the like. It was rotated to the position, and the joints at the ends were pulled together by a jack to connect them. Therefore, since the connection is performed in a state in which both the girders are suspended, a shake occurs and the connection work is difficult.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and provides a method for erection of steel girders that can perform a work of connecting two divided steel girders quickly and easily. The purpose is to do.

[0005]

That is, according to the present invention, one of two divided steel girder blocks is lifted while its base end side is supported on a frame, and the other steel girder block also has its base end. It is a method of erection of steel girders, in which the sides are lifted while being supported on a pedestal and the ends of both steel girder blocks are connected. Further, the steel girder is divided into a fixed side block and an adjustment side block, and the fixed side block is lifted and fixed while the base end side thereof is supported on a frame, and the adjustment side block is fixed at the base end side. It is a method of erection of a steel girder, which is carried out by lifting it while being supported on a gantry, and moving it in the direction of the tip side to connect the fixed side block and the tips to each other. Further, the steel girder is divided into a fixed side block and an adjustment side block, and the fixed side block is lifted and fixed while the base end side is supported on a pedestal, and the adjustment side block is fixed at the base end side. It is lifted while being supported on a pedestal, and it is sent out toward the tip side by the sending equipment installed at the base end side, and the adjusting side block is drawn into the fixed side block side by the drawing equipment installed at the tip of both blocks It is a method of erection of steel girders by connecting the tips of the.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that although the present embodiment describes the construction of a bridge, the present invention is not limited to this. <A> Assembling of sending equipment As shown in FIG. 1, when constructing a bridge, existing abutments 1a and 1b constructed on both sides of the river are used. On one side of the abutment, in the present embodiment, on the upper side of the abutment 1b on the right side of the drawing, the delivery facility 2 is assembled by a crane or the like.

As the sending equipment 2, two types as shown in FIGS. 9 and 10 can be considered. Delivery facility 2a of FIG.
Is a structure in which a base 21 made of H steel or the like is provided above the abutment 1b, and a slide bearing 22 made of a Teflon plate or the like is provided above the base 21.

The sending equipment 2b shown in FIG. 10 is the abutment 1b.
This is a structure in which a rail 23 and a stopper 24 are provided on an end portion of the rail 23, and a turning carriage 25 is installed on the rail 23 so that it can travel.

<B> Temporary placement of the erection block As shown in FIG. 2, the bridge is composed of a fixed side block 3a and an adjustment side block 3b which are divided into two parts from the middle part. These blocks 3a and 3b are carried in to a construction site by a trailer or assembled on site and then temporarily placed in parallel with a river by a crane 4.

As a preparation for installation, assembling scaffolding scaffolding, assembling retraction equipment, and installing a jack system and a measuring system are performed. Of these, as shown in Fig. 2, the measurement system is installed in the total station near the construction site on both banks of the river.
Set up Option 5, etc.

As the drawing-in equipment, the equipment as shown in FIG. 11 is equipped at the joints at the tips of both blocks 3a, 3b. In this retracting equipment 6, one end of a plurality of retracting jacks 62 such as clevis jacks are pivotally supported on a jack installation jig 61 fixed on the adjustment side block 3b side, and the other end side is fixed to the fixed side block 3a. It is mounted on the pressure bearing jig 63 via a U-shaped washer 64.

Further, the middle of the retracting jack 62 is supported by a jack receiving metal fitting 65 fixed to the adjustment side block 3b side, and the tip of the retracting jack 62 is provided with a limit switch 66.
The structure to connect with.

Then, an erection piece 67 and a connecting jig 68 are provided at the joint between the fixed block 3a and the adjusting block 3b, and the retracting jack 62 is contracted to move the adjusting block 3b to the fixed block. The joint portions of both the blocks 3a and 3b can be connected to each other by pulling in the 3a side. By adopting such a retracting equipment 6, effects such as unmanned connection of swaying girders, retention of strength against dead load, and splicing work at any time can be expected.

<C> Turning and fixing the fixed block As shown in FIG. 3, the fixed block 3a is lifted by the crane 4 via the hanging balance 41 and is swung to a predetermined position across the river. Then, after the position measurement and adjustment are performed and the fixed block 3a is positioned, the base end side thereof is mounted on the abutment 1a, and the tip end side thereof is fixed with a trough wire. As a result, the fixed block 3a can maintain a stable state by supporting both ends of the front end and the base end.

In the positioning, the fixed side block 3a is measured for inclination, deflection and passage (by total station 5), and adjustment based on the measurement is performed for inclination and deflection. Block and the trawler.

<D> Turning and Positioning of Adjustment-side Block As shown in FIG. 4, the adjustment-side block 3b is also turned and positioned similarly. However, the adjustment-side block 3b performs positioning while ensuring a predetermined space between the tips of the blocks 3a and 3b.

Further, as shown in FIGS. 9 and 10, a reaction force receiver 26 and a delivery jack 27 are attached to the base end side of the adjustment side block 3b in advance, and the adjustment side block 3b is installed on the delivery facility 2.

<E> Sending out of the adjustment side block As shown in FIG.
It is sent out until the tips of a and 3b come close to each other. At this time as well, position measurement and adjustment are performed in the same manner as described above, and the status of the joint portion is confirmed by a CCD camera.

<F> Retraction of adjustment side block After the two blocks 3a and 3b are brought close to each other, the retraction jack 62 of the retraction equipment 6 is contracted to move the adjustment side block 3b to the fixed side block 3a side as shown in FIG. Pull in. After measuring the installation shape by the total station 5, the splicing work of the joints of both blocks 3a, 3b (erection piece)
And connect them.

<G> Installation of Bridge After the connection of both blocks 3a and 3b is completed, the retracting equipment 6 is removed, and the bridge 3 is lifted from the abutments 1a and 1b and the delivery equipment 2 is removed. And again, bridge 3 and abutment 1
a and 1b, and then install. This completes the erection work.

[0021]

Since the present invention has been described above, the following effects can be obtained. That is, the base end side of the steel girder block can be connected to the pedestal, and the tip end side of the steel girder block can be connected to the suspending member, and both ends of the steel girder block can be supported for connection work. Therefore, the runout of the steel girder block when connected is halved,
Connection work can be done quickly and easily.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an assembling process of a delivery facility.

FIG. 2 is an explanatory diagram of a temporary placing process of a steel girder block.

FIG. 3 is an explanatory diagram of a process of turning and fixing a fixed block.

FIG. 4 is an explanatory view of a turning process of the adjustment side block.

FIG. 5 is an explanatory diagram of a sending process of the adjustment side block.

FIG. 6 is an explanatory diagram of a retracting process of the adjusting block.

[Fig. 7] Explanatory drawing of the removal process of the delivery facility

FIG. 8 is an explanatory diagram of a completed installation state

FIG. 9 is an explanatory diagram of the sending equipment.

FIG. 10 is an explanatory diagram of a sending facility.

FIG. 11 is an explanatory diagram of the drawing equipment

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyuki Koyoshi 1-3-11 Takinokawa, Kita-ku, Tokyo Within Kawada Industry Co., Ltd. (72) Toshio Otomo 1-13-1 Takinogawa, Kita-ku, Tokyo Kawada Industry Co., Ltd.

Claims (3)

[Claims] 1. One of the two divided steel girder blocks is lifted with its base end side supported on a gantry, and the other steel girder block is also lifted with its base end side supported on a gantry. A method of constructing steel girders by connecting the ends of both steel girder blocks. 2. A steel girder is divided into a fixed side block and an adjustment side block, and the fixed side block is lifted and fixed while the base end side thereof is supported on a frame, and the adjustment side block is fixed to the base side. A method for erection of a steel girder in which the end side is lifted while being supported on a gantry, and the end side is moved toward the tip side to connect the fixed side block and the tips to each other. 3. A steel girder is divided into a fixed side block and an adjustment side block, and the fixed side block is lifted and fixed with its base end side being supported on a gantry, and the adjustment side block is Suspend while supporting the end side on the pedestal, send out toward the tip side by the delivery equipment installed at the base end side, and pull in the adjustment side block to the fixed side block side by the retraction equipment provided at the tips of both blocks A steel girder installation method in which the ends of both blocks are connected with each other.