JPH11172628A - Device for continuously sending out bridge girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably shorten a period required for the erection work of a bridge girder. SOLUTION: A screw rod 3 is disposed on a guide frame extending in the direction of sending-out of a bridge girder along the longitudinal direction, and rotated by drive of a motor for sending 4. The screw rod 3 makes a front half part 3a and a rear half part 3b a reverse screw by making a center a boundary. A front girder lifting jack 5 is assembled on the front half part 3a of the screw rod 3, a rear girder lifting jack 6 is assembled on the rear half rod 3b of the screw rod 3, and approach, separation and movement can be performed by the rotation of the screw rod 3. A bridge girder 1 is delivered between the front girder lifting jack 5 and the rear girder lifting jack 6 to be sent out continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous feeder for a bridge girder used for erection work of a bridge.

[0002]

2. Description of the Related Art As one of the construction methods of a bridge, a method of assembling a bridge girder in advance to a required length at a position other than a construction point, and then sending the bridge girder horizontally to the construction point in a longitudinal direction to construct the bridge. There is.

[0003] An outline of such an erection method is shown in Figs.
As shown in FIG. 8C, first, as shown in FIG. 8A, a hydraulic horizontal jack b installed at one end in the longitudinal direction on the base frame a, and the longitudinal length of the base frame a is driven by driving the horizontal jack b. A hydraulic lifting jack c assembled so as to be able to move in the direction, and a hydraulic temporary support installed on the other longitudinal end of the base frame a deviating from the moving stroke (normally 1 m) of the lifting jack c A delivery device e including a jack d is installed on a fixed structure f such as a yard or a pier, and the temporary receiving jack c is contracted. The girder lifting jack c positioned at the end is extended, and the bridge girder g assembled to a required length using a crane is placed on the girder lifting jack c. The bridge girder g
The other required portions in the longitudinal direction of the bridge girder can be received by another delivery device or an auxiliary bogie according to the feed amount of the bridge girder g. h indicates a girder support plate.

In the above state, as shown in FIG. 8 (b), by driving the horizontal jack b to move the lifting jack c forward in the delivery direction, the bridge girder is delivered in the delivery direction by a fixed stroke. I do. next,
As shown in FIG. 8 (c), the temporary receiving jack d is extended so that the load of the bridge girder g is received by the temporary receiving jack d. During this time, the contracted girder lifting jack c is retracted by driving the horizontal jack b. Return to the side stroke end position.

Thereafter, as shown in FIG. 8A, the load of the bridge girder g is transferred to the girder lifting jack c again by extending the girder lifting jack c and contracting the temporary receiving jack d. By repeating the same steps as those described above, the bridge girder g is sent to the erection point, and the bridge girder g is lowered and erected at the erection point using the descent equipment.

[0006]

However, in the case of the above-described construction method in which the bridge girder g is fed out horizontally, when the bridge girder g is sent out by the stroke of the horizontal jack b, the girder lifting jack c is returned to the original position. After retreating, it is necessary to perform so-called rearrangement work, so that continuous feeding of the bridge girder cannot be performed. Therefore, time loss is large and work is efficiently performed. There is a problem that it cannot proceed.

[0007] If two delivery devices e are installed in tandem (serial) in the longitudinal direction and the two delivery devices e are operated alternately, continuous delivery becomes possible. Two (two systems) horizontal movement drive units are required.

[0008] Therefore, the present invention enables the bridge girder to be continuously sent out without performing refilling work, thereby greatly reducing the time required for bridge construction work. Further, it is an object of the present invention to provide a continuous bridge beam feeding device that can be operated by one (one system) horizontal movement drive unit.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a screw rod having a front half and a rear half reversely screwed around a center part, while rotatably supporting the screw rod on a base frame. A feed motor is connected and installed at one end of the screw rod, and a front girder lifting jack and a rear girder lifting jack arranged vertically in the front half and the rear half of the screw rod, respectively, by rotating the screw rod. , So that they can be moved toward and away from each other.

With the front girder lifting jack positioned at the forward stroke end of the front half of the screw rod and the rear girder lifting jack positioned at the retraction stroke end of the rear half of the screw rod, first, the rear girder lifting jack is used. By supporting the bridge girder and rotating the screw rod in the forward direction, the rear girder lifting jack is advanced so that the bridge girder is fed horizontally by one stroke. At this time, since the front girder lifting jack is located at the retraction stroke end of the first half of the screw rod, next, after passing the bridge girder to the front girder lifting jack, rotate the screw rod in the opposite direction. As a result, the front girder lifting jack is advanced, and the bridge girder is further fed by one stroke. Thereafter, the bridge girder is continuously sent out by repeating the switching of the rotation of the screw rod between normal and reverse and the transfer of the bridge girder in the same manner.

In addition, instead of applying the rotational driving force of the screw rod at one end of the screw rod, the rotational driving force may be applied at the center of the screw rod. By dividing into forward screws, and by having the front and rear screw rods rotate in opposite directions,
The overall length of the device can be shortened.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show an embodiment of the present invention. In the widthwise central portion of a base frame 2 whose longitudinal direction extends in the feeding direction of a bridge girder 1 (direction of arrow X), FIG. A screw rod 3 composed of a ball screw having a front half 3a and a rear half 3b reversely threaded with respect to a center portion is arranged along the longitudinal direction and rotatably supported,
A hydraulic feed motor 4 is connected to one end in the longitudinal direction of the screw rod 3 and the screw rod 3
A front girder lifting jack 5 and a rear girder lifting jack 6 arranged vertically in the front half 3a and the rear half 3b, respectively, are moved toward and away from each other by the rotation of the screw rod 3 driven by the feed motor 4. A guide rod 7 is installed in such a manner that it can be moved forward and backward in the longitudinal direction, and guide rods 7 through which girder lifting jacks 5 and 6 are inserted in the left and right positions on the base frame 2 are arranged in parallel with the screw rod 3. , The forward and backward movements of the lifting jacks 5, 6 can be guided.

The screw rod 3 has a length of the front half 3a and the rear half 3b of reverse screw, that is, the forward and backward strokes of the lifting jacks 5 and 6, for example.
It is set to 1 m. 8 denotes a girder receiving material.

Next, a specific procedure for sending the bridge girder 1 to the erection point using the continuous feeding device having the above-described configuration will be described.

First, the entire apparatus is installed on a fixed structure such as a pier, and as shown in FIGS. 1 and 2, a front girder lifting jack 5 is previously placed on the forward stroke end of the screw rod front half 3a. In a state where the rear girder lifting jack 6 is located at the retreat stroke end of the screw rod rear half 3b, the front girder lifting jack 5 is contracted and the rear girder lifting jack 6 is extended to provide a rear girder lifting jack. 6 so that the bridge girder 1 is placed thereon. The bridge girder 1 is designed so that another delivery device, an auxiliary trolley, or the like installed at another location can simultaneously receive an appropriate location in the longitudinal direction.

In the above state, when the screw motor 3 is rotated in the forward direction by the drive of the feed motor 4, the front half 3a and the rear half 3b of the screw rod 3 are reversely screwed. At the same time as the jack 5 is retracted, the rear girder lifting jack 5 is advanced, and as shown in FIG. 3, the rear girder lifting jack 6 is moved forward to the forward stroke end of the screw rod rear half 3b, whereby the bridge girder 1 Is horizontally sent forward by one stroke.

As described above, when the rear girder lifting jack 6 reaches the forward stroke end of the screw rod rear half 3b, the front girder lifting jack 5 is positioned at the retreating stroke end of the screw rod front half 3a. Next, as shown in FIG. 4, the front girder lifting jack 5 is extended and the rear girder lifting jack 6 is contracted so that the bridge girder 1 is transferred onto the front girder lifting jack 5. Then, by rotating the screw rod 3 in the reverse direction by driving the feed motor 4, as shown in FIG. 5, the front girder lifting jack 5 is moved forward to the forward stroke end of the screw rod front half 3a. I do. As a result, the bridge girder 1 is sent further forward by one stroke.

Thereafter, the bridge girder 1 is continuously delivered to the erection point by sequentially transferring the bridge girder 1 between the front and rear girder lifting jacks 5 and 6 and switching the rotation of the screw rod 3 in the forward / reverse direction. It is.

In this manner, since the bridge girders 1 can be continuously fed, the period required for the bridge erection work can be greatly reduced. In addition, it can be operated by one horizontal movement drive unit, which is advantageous.

FIGS. 6 (a) and 6 (b) show another embodiment of the present invention. In the same configuration as shown in the above embodiment, the rotational driving force of the screw rod 3 is applied to the screw. Instead of being provided at one end of the rod 3, it is provided at the center of the screw rod 3. That is, a bevel gear 9 is attached to the center of the screw rod 3 and a bevel gear 10 that meshes with the bevel gear 9 is provided to form a power transmission mechanism 11, and the feed motor 4 is connected to the shaft of the bevel gear 10. Things.

With the construction shown in FIGS. 6 (a) and 6 (b), the same operation and effect as in the above embodiment can be obtained, and the feed motor 4 does not project from the end of the screw rod 3. The overall length of the apparatus can be shortened accordingly.

FIG. 7 shows still another embodiment of the present invention. In a configuration similar to that shown in FIGS. 6A and 6B, the screw rod 3 is connected to the front screw rod 3A at the center. The rear screw rod 3B is divided into forward screw threads, and the power transmission mechanism 11 is provided with bevel gears 9A and 9B at opposite ends of the screw rods 3A and 3B.
And bevel gears 9A
The bevel gear 10 is meshed with both of the screw rods 3A and 9B at the same time so that the two screw rods 3A and 3B are rotated in reverse.

Even if the configuration shown in FIG. 7 is adopted, FIG.
The same operation and effect as those of the embodiment shown in (b) can be obtained.

In the above embodiment, the case where the bridge girder 1 is sent out using one continuous feeding device has been described. However, when the bridge girder 1 has a considerable left and right width such as a box girder, for example, It is optional to use the two continuous feeders at intervals in the left-right width direction, and the power transmission mechanism 11 that transmits the driving force of the feed motor 4 to the screw rod 3 includes: Needless to say, a structure other than the illustrated structure can be arbitrarily selected, and various changes can be made without departing from the scope of the present invention.

[0026]

As described above, according to the bridge girder continuous feeder of the present invention, the following excellent effects are exhibited. (1) A screw rod having a front half and a rear half reversely screwed around a center part is rotatably supported on a base frame, and a feed motor is connected to one end of the screw rod, and the screw rod is mounted. The front half and the rear half of the front girder lifting jack and the rear girder lifting jack arranged vertically, respectively, are assembled so that they can move closer to and away from each other by the rotation of the screw rod, so that the front part Due to the proximity lifting movement of the girder lifting jack and the rear girder lifting jack and alternate expansion and contraction, the bridge girder can be sent out continuously in the horizontal direction without performing refilling work, so that the bridge erection work can be completed in a short time. It can be performed efficiently, and it is smaller than the conventional case where two feeding devices are arranged in tandem, so continuous feeding in a small space is possible. In addition, it is extremely advantageous because it can be operated by one horizontal movement drive unit. (2) Instead of applying the rotation driving force of the screw rod at one end of the screw rod, the screw rod may be provided at the center of the screw rod, or the screw rod may be divided into a front part and a rear part at the center. In this configuration, the front and rear screw rods are rotated in opposite directions to each other and the front and rear screw rods are rotated in opposite directions, so that the overall length of the apparatus can be shortened, and compactness can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of a continuous bridge girder delivery device of the present invention.

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

FIG. 3 is a schematic side view showing an operation state different from that in FIG. 1;

FIG. 4 is a schematic side view showing an operation state different from that of FIG. 3;

FIG. 5 is a schematic side view showing an operation state different from that of FIG. 4;

FIG. 6 shows another embodiment of the present invention.
Is a schematic side view of the whole, and (b) is an enlarged view of a B portion of (a).

FIG. 7 shows still another embodiment of the present invention, and is a schematic view of a portion corresponding to FIG. 6 (b).

FIG. 8 shows an example of a bridge girder erection method.
(B) and (c) are schematic diagrams showing working steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge girder 2 Base frame 3 Screw rod 3a Front half 3b Rear half 3A Front screw rod 3B Rear screw rod 4 Feeding motor 5 Front girder lifting jack 6 Rear girder lifting jack

Claims (3)

[Claims] 1. A screw rod having a front half portion and a rear half portion having reverse screws around a center portion is rotatably supported by a base frame, and a feed motor is connected and installed at one end of the screw rod; A front girder lifting jack and a rear girder lifting jack arranged vertically in the front half and the rear half of the screw rod, respectively, have a configuration in which the screw rod is rotated so that they can move close to and away from each other. A unique bridge girder continuous feeder. 2. The continuous feeder according to claim 1, wherein the rotational driving force of the screw rod is applied at the center of the screw rod instead of being applied at one end of the screw rod. 3. The continuous feeding device according to claim 2, wherein the screw rod is divided into a front part and a rear part at the center to form forward threads, and the front and rear screw rods are rotated in opposite directions.