JP2003286708A - Forwarding construction method for bridge girder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a forwarding method forwarding a bridge girder only by the traveling of a truck, on which the bridge girder is placed, from the start end of an assembly yard to an end without pulling the bridge girder from a front in the forwarding direction. <P>SOLUTION: In a construction method in which the bridge girder is forwarded and built on a pier in the front from the assembly yard, the self-propelled truck is placed on parallel rails laid on the assembly yard, and a feed bar is placed on the pier. In the construction method, the self-propelled truck has a lifter mechanism vertically moving the loaded bridge girder, a traversing mechanism moving and adjusting the placed bridge girder in the direction orthogonal to the forwarding direction, a brake mechanism braking a traveling and a friction imparting mechanism imparting frictional force among the rails and the truck, and the bridge girder is forwarded by the traveling of the truck from the start ends of the rails to the ends by the operation of these mechanisms. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for sending out a bridge girder from an assembly yard onto a pier for erection.

[0002]

2. Description of the Related Art A method of sending out a bridge girder or the like on a pier is a method of placing a carriage on a rail laid on an assembly yard, placing the bridge girder on this carriage, and moving the carriage to send the bridge girder toward the pier. Is the way. As a dolly used for this method, a general dolly with wheels attached to the frame,
Or a crawler type trolley equipped with crawlers instead of wheels,
Alternatively, there is a roller type trolley, etc., but since this trolley itself does not have a device for generating thrust, a device for generating thrust must be used in combination. In addition, a self-propelled trolley equipped with an electric motor for generating thrust on the trolley, which does not require a power unit for generating thrust, is also partially developed and exists.

[0003]

However, when the bridge girder is sent out by the former truck which is not equipped with the thrust generating device, as described above, the device for generating the thrust separately, for example, the clamp horizontal jack is connected and pushed. However, in this case, continuous feeding is not possible.

In order to supplement the above-mentioned phenomenon, the following measures have been conventionally taken. For example, a wire is connected to a hand-rolling machine connected to the tip of a heavy object, and this wire is sent out and pulled from the front. As the pulling means, a combination of a wire clamp and a jack, a winch, or the like is used (see Japanese Patent Laid-Open No. 2001-172918). However, it is difficult to connect the wire to the tip of the hand-rolling machine and pull the wire from the front in the feeding direction, and it is necessary to synchronize the pulling side and the feeding side. However, when the feeding position and the pulling side are separated by several hundred meters or more, the tuning operation is difficult.

Further, the above-mentioned trolley only mounts the bridge girder, and does not have means for moving the mounted bridge girder up and down and changing and adjusting the sending direction. Therefore, when sending out a curved bridge girder, a device for correcting the sending direction must be separately arranged. Even in the case of a bogie equipped with a self-propelled means by an electric motor, there is a problem that the bogie slips due to the reduction of the load on the bogie as described above, the thrust cannot be applied to the bridge girder to be sent, and the bridge girder cannot be sent out. Also, when supporting a long heavy object, multiple bogies are connected, but in order to equalize the load acting on each bogie, beams are piled up on the bogie to balance them, and heavy objects are placed on the beams. We put and support. Therefore, the position for supporting the heavy object becomes high, and there is a problem that the work of delivering the heavy object must be performed in a very unstable state.

The present invention has been made in view of the problems of the above-mentioned conventional technique, and its purpose is to extend the bridge girder from the start end to the end without pulling the bridge girder from the front in the feeding direction. An object of the present invention is to provide a delivery method that can deliver a bridge girder only by traveling by a truck. Another object is to provide a delivery method capable of continuous delivery.

[0007]

[Means for Solving the Problems] The technical means taken by the present invention in order to achieve the above-mentioned object is a bogie capable of traveling by itself on parallel rails laid in an assembly yard, or a bogie traveling by an external force. , A feed table is placed on the pier, and the carriage is provided with a lifter mechanism capable of moving up and down the bridge girder to be mounted, and a lateral movement mechanism for moving and adjusting the mounted bridge girder in a direction orthogonal to the sending direction, By these operations, the bridge girder is sent out from the start end of the rail to the end by the traveling of the bogie. (Claim 1)

The above-mentioned self-propelled trolley is a self-propelled trolley provided with a driving mechanism for traveling. As a method of causing the trolley to travel by an external force, the trolley may be mounted at the front or rear or front and rear of the trolley. A method of connecting the clamp horizontal jacks and running them by these operations (pushing, pulling, etc.) can be mentioned.
Also, since the lifter mechanism supporting the bridge girder can be moved and adjusted in the direction orthogonal to the sending direction of the bridge girder, by sliding the lifter mechanism in the width direction while sending out,
It is possible to send continuously while correcting the sending direction. The feed stand placed on the pier is a crawler type feed stand,
Any of a roller-type feed table and a slide-type feed table may be used. A horizontal hydraulic jack is preferable as a lateral movement mechanism for moving the lifter mechanism in the left-right direction. Even if the horizontal hydraulic jacks are attached to the left and right lifter mechanisms respectively, or a double rod-type horizontal hydraulic jack is used, the left and right rod tips are used. May be connected to the left and right lifter mechanisms.

According to this method, the bridge girder supported on the trolley via the lifter mechanism can be sent to the pier by traveling of the trolley by its own force or external force. Further, since the truck is provided with the lifter mechanism and the lateral movement mechanism, it is possible to accurately feed the bridge girder by adjusting the feeding direction of the bridge girder in the up-down direction and the horizontal left-right direction.

The trolley has a frame having a length that straddles a rail laid in parallel, a drive mechanism equipped with a wheel that runs on the upper surface of the rail suspended from the frame according to the rail width, and an upper surface of the frame. It is effective to use a self-propelled bogie in which at least two bogie blocks each having a pair of left and right lifter mechanisms which are arranged in a substantially rail width and which can be moved up and down are connected in the rail direction (claim 2). Further, it is more preferable that the self-propelled carriage is provided with a friction applying mechanism for applying a frictional force between the self-propelled carriage and the rail to prevent slipping of the wheels (claim 3). In this case, the tip of the sent-out bridge girder rests on the feed bar on the pier, and the load (load) that acts on the bogie
When the wheel slips and the wheel slips, the friction applying mechanism is operated to prevent the wheel from slipping, whereby the thrust can be reliably generated even when the load is lost in the latter half of the feeding. When the truck is provided with a brake mechanism or configured so that a braking force is applied from the outside, the traveling of the truck can be controlled and safe traveling can be ensured. Therefore, it is possible to send out to the end of the rail by traveling only by the truck. Examples of the brake mechanism include a mechanical brake and an external brake.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The delivery method of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing a state in which a bridge girder is sent from the assembly yard A to the piers B1 to B5 installed in front of the assembly yard A. Rails 1, 1 ′ are laid in parallel in the assembly yard A, and the rails 1 Self-propelled carriage C across 1 '
Is placed so that it can travel freely, and the feed table D is placed on the piers B1 to B5.
The bridge girder W mounted on the self-propelled carriage C is sequentially moved from the assembly yard A to the piers B1 to B5 and erected by the traveling of the self-propelled carriage C.

The above-mentioned self-propelled carriage C has a lifter mechanism 2 capable of moving up and down the bridge girder W on which it is mounted, a lateral moving mechanism 3 for moving and adjusting the bridge girder on which it is mounted, in a direction orthogonal to the feed-out direction, and for running the carriage. Brake mechanism 4 for braking, the rail 1,
1'is provided with a friction applying mechanism 5 for applying a frictional force,
By operating each of these mechanisms depending on the situation, the rail 1,
The self-propelled carriage C can be reliably moved from the start end to the end of 1'and the thrust for sending out the bridge girder W can be generated only by the self-propelled carriage C.

The self-propelled carriage C and the rails 1, 1'for guiding the carriage C will be described below. The rails 1 and 1'for supporting and guiding the self-propelled carriage C are made of steel material having a substantially H-shaped cross section, and a friction imparting mechanism for preventing the self-propelled carriage C from slipping on the upper surface of the upper flange 1a thereof. A rack 501, which is a component member of No. 5, is formed in the length direction of the rail along both sides in the axial direction.

The trolley block c constituting the self-propelled trolley C mounted on the rails 1 and 1'is the parallel rails 1 and 2 described above.
A pair of left and right drive mechanisms 7 are suspended and supported on the lower side of the frame 6 having a length that straddles 1'to match the width of the rails 1 and 1 ', and the upper surface of the frame is adjusted to substantially match the rail width. A pair of left and right lifter mechanisms 2 are connected by a lateral movement mechanism 3.

The frame 6 is made of a steel material having a substantially H-shaped cross section, and a pair of front and rear vertical jacks 8 and 8'with clevis are provided between the upper flange 6a and the lower flange 6b in the longitudinal direction of the frame 6. A pair of right and left are arranged according to the width of the rails 1 and 1 ', and a pair of front and rear vertical jacks arranged on the left and right of the rail support the driving mechanism 7 in a hanging manner. As a result, the wheels 702 of the drive mechanism 7 are always urged so as to come into contact with the surface of the upper flange 1a of the rails 1, 1 '. That is, the drive mechanism 7
Is independently suspended from the frame 6 by a hydraulic suspension.

In the drive mechanism 7, a wheel 702 is rotatably supported via a bearing between the left and right side portions of a machine frame 701 having a substantially U-shaped cross section, and the shaft of the wheel 702 is a side portion of the machine frame 701. It is configured to be connected to a rotary shaft of a hydraulic motor 703 attached to the outer surface to drive and rotate. A toothed gear 502 that meshes with a rack 501 provided on the upper surface of the upper flange 1a of the rail 1 or 1'is fixed to the shaft of the wheel 702 so as to integrally rotate. There is. A guide wheel 704, which comes into contact with the lower surface of the upper flange 1a of the rail 1 or 1 ', is rotatably supported inside the lower left and right side portions of the machine frame 701.
The upper flange 1a is sandwiched between the wheel 702 and the wheel 702 so that the wheel cannot be removed.

The lifter mechanism 2 is constructed by horizontally attaching a receiving plate 202 via a spherical seat to a rod tip of a hydraulic jack 201 for vertical height adjustment which is supported by penetrating the upper flange 6a of the frame 6. Has been done. The hydraulic jack 201 is provided on the upper flange 6 of the frame 6.
The left and right hydraulic jacks 201, 201 are connected to each other by a lateral movement mechanism 3 supported on the frame 6 while being supported so as to be movable left and right along the guide elongated hole 9 formed in a. The lateral movement mechanism 3 is composed of a horizontal hydraulic jack 301, which is attached to the left and right lifter mechanisms 2 respectively, and its operation is performed by synchronizing the left and right horizontal hydraulic jacks 301 and 301, and the left and right lifter mechanisms 2 maintain a distance. It is designed to move in the left-right direction (direction orthogonal to the bridge axis) in this state. Therefore, when the left and right horizontal hydraulic jacks 301 constituting the lateral movement mechanism 3 are activated, the left and right hydraulic jacks 201 having the receiving plate 202,
201 is moved to the left and right in the guide slot 9 with the distance between both jacks maintained. Thereby, the feeding direction of the heavy load W can be adjusted to the left and right. The horizontal hydraulic jack 301 that constitutes the lateral movement mechanism 3 may be a double rod type hydraulic jack, and the tip ends of the left and right rods thereof may be connected to the left and right lifter mechanisms.

The self-propelled carriage C is constructed by connecting a plurality of the carriage blocks c configured as described above according to the length of the heavy object W to be sent out and the like. The number of connections is at least two or more. The form in which the bogie blocks c are connected to each other is such that the connecting projections 9 are provided on the front and rear portions of the outer surface of the machine frame 701 of the drive mechanism 7 suspended on the frame 6 which constitutes the bogie block c.
And the drive mechanisms 7 of the bogie block c arranged along the bridge axis direction are connected to the connecting projections 9 and the connecting key 10 is fitted over both connecting projections 9 to connect them. To do. Since this connection connects the left and right side portions of the bogie block c, the bogie blocks c that are connected are unified, and the whole is in a straight line, which is suitable for straight running. On the other hand, since each connected bogie block c has a limited degree of freedom, it is not suitable for a curved rail.

Although the trolley block c described above is formed by a single frame, the frame of the trolley block may be formed by connecting a plurality of members. That is, the frame is arranged in a straight line with the left and right members on the left and right sides of the intermediate member, and the abutting portions of the intermediate member and the left and right members are joined together using bolts and nuts to unify them. Good. In this configuration, the length of the frame can be changed by changing the length of the intermediate member or the left and right members, and the width of the rail can be accommodated. or,
When the frame is formed by connecting the three members as described above, the lateral movement mechanism 3 that moves the pair of left and right lifter mechanisms 2 mounted on the left and right members of the frame in the left-right direction is attached to the intermediate member, By using a joint member separately from the hydraulic jacks 201, 201 for adjusting the height in the vertical direction of the lifter mechanism 2 supported on the right side member, the length of the joint member can be changed by changing the length of the joint member. Can be dealt with.

Further, the friction applying means for preventing the slip between the wheels 702 of the drive mechanism 7 suspended on the frame of the truck block c and the rails 1, 1'is not limited to the rack and pinion method described above, but other methods, For example, the rolling member is pressed against the lower surface of the upper flange of the rail 1, 1 ′ by a hydraulic jack attached to the machine frame of the drive mechanism 7, and the upper flange of the rail 1, 1 ′ is connected to the wheels of the drive mechanism and the rolling member. It may be sandwiched by a moving member, thereby giving a frictional resistance to the rotation of the wheel and preventing the occurrence of slip. The form of the rolling member that is pressed against the lower surface of the upper flange by the hydraulic jack may be any type such as a crawler type or a roller type as long as it does not hinder the rotational running of the wheels. Of course, this friction imparting mechanism may be used in combination with the above-described system including the rack 501 and the toothed gear 502. Further, this friction imparting mechanism may be provided along the entire length of the rails 1 and 1 ', but it is provided only near the end of the rail where the load (load) on the self-propelled carriage C is reduced, and the slip of the self-propelled carriage C is prevented. May be prevented.

Further, the trolley blocks c are connected to each other by providing connecting lugs at the front and rear end portions of the frame forming the trolley blocks at substantially the center in the width direction, and connecting lugs of the trolley blocks arranged in the front and rear. A connecting pin is inserted and connected across the pieces. In this case, since the bogie blocks are connected to each other at substantially one central portion in the width direction, the connected bogie blocks can be freely horizontally rotated within the range between the bogie blocks,
Suitable for running along curved rails.

As shown in FIGS. 6 and 7, the feed table D installed on the pier B is supported on the board 11 by a large number of vertical hydraulic jacks 13 on both sides of the machine body 12 in the width direction. Is suspended in the air, and a crawler 14 is wound around the outer peripheral surface of the machine body 12 so as to be endlessly rotatable.
Also, each vertical hydraulic jack 13 supporting the above-mentioned airframe 12
Are connected by a connecting base plate 15, and a substantially central position of the connecting base plate 15 is axially fixed to the substrate 11 so as to be horizontally rotatable. Further, on the base plate 11, hydraulic jacks 16 and 16 'for correcting the direction are mounted at the front and rear portions in the longitudinal direction of the machine body 12 and extending between the base plate 11 and the connection base plate 15,
The direction correction hydraulic jacks 16 and 16 'are operated to correct the direction of the machine body 12 around which the crawler 14 is wound.

Next, a method for sending out the bridge girder W using the above-described self-propelled carriage C and feed stand D will be described.
First, rails 1, 1'are laid in parallel on the assembly yard A installed in front of the pier B1, and the self-propelled carriage C in which at least two carriage blocks c are connected is placed on the rails 1, 1 '. The bridge girder W is mounted on the receiving plate 202 of the lifter mechanism 2 arranged on the frame 6 of the bogie block c that constitutes the self-propelled bogie C.
To place. At this time, if the bridge girder W is a long one, the bridge girder flexes in an arch shape, but since the receiving plate 202 of the lifter mechanism 2 arranged on the frame 6 of the carriage block c can be moved up and down by the hydraulic jack 201, By making the hydraulic pressure of the hydraulic jack 201 the same, the load of the bridge girder can be evenly received.
That is, the load of the bridge girder can be received by the receiving plates 202 of all the lifter mechanisms 2 of the self-propelled carriage C.

Then, by operating the drive mechanism 7 of the carriage block c constituting the self-propelled carriage C, the self-propelled carriage C can travel and send out the bridge girder W. In the delivery, when the delivery direction inclines vertically with respect to the horizontal plane, the hydraulic jack 201 for adjusting the vertical height of the lifter mechanism 2 provided in the carriage block c is operated to set the bridge girder to a predetermined inclination. Can support and send out. or,
When sending out at an angle to the left and right in the horizontal direction, the pair of left and right lifter mechanisms 2 arranged in the carriage block c is moved by the hydraulic jacks 301 of the lateral movement mechanism 3 in the direction orthogonal to the bridge axis. The direction can be corrected to the left and right (see FIGS. 8A and 8B).

Further, when the feeding work progresses and the tip of the bridge girder W is transferred to the feed table D on the pier B1 in front of the assembly yard A, the load (load) acting on the self-propelled carriage C is higher than that in the initial state. It gets lighter. At this time, since the friction imparting mechanism 5 is provided in the drive mechanism 7 of the carriage block c, even if the load acting on the self-propelled carriage C is reduced, the self-propelled carriage C is surely operated by the friction imparting mechanism 5. Go to and eliminate the dolly slip. Also, in the case of a bridge girder that is curved in the horizontal direction, the lateral movement mechanism 3 of the self-propelled carriage C is adjusted, and the hydraulic jacks 16 and 16 for direction correction mounted on the feed table D installed on the pier B1 are adjusted. By operating
It is possible to feed continuously while correcting the feeding direction (see FIGS. 9A and 9B). Therefore, the bridge girder can be reliably sent out only by the self-propelled carriage mounted on the rails 1, 1'on the assembly yard, and even when the curved girder is sent out, the lifter mechanism 2 (hydraulic jack 201) equipped to the main carriage. , And the lateral movement mechanism 3 (the hydraulic jack) for moving the lifter mechanism 2 in the frame length direction of the bogie block.
By operating 301), it is possible to send out a predetermined amount. In addition, since the self-propelled carriage receives the entire load evenly by the lifter mechanism installed in each block regardless of the number of connected truck blocks, the height from the rail to the load is always constant regardless of the number of connected truck blocks. Is.

[0026]

The method of sending out the bridge girder of the present invention is claimed in claim 1.
With the configuration described above, the bridge girder can be reliably delivered from the start end to the end of the rail by running a truck mounted on the rail laid on the assembly yard. Moreover, the delivery can be performed while adjusting the vertical direction and the horizontal horizontal direction. Further, according to the second aspect of the present invention, the load acts evenly on each bogie block constituting the bogie, so that the height position for supporting the bridge girder is always constant regardless of the number of connected bogie blocks. Therefore, the conventional problem that the position of supporting the bridge girder changes in height depending on the number of connected bogie blocks can be solved. Further, since it is not necessary to use another thrust device separately, continuous feeding work can be smoothly performed. Further, claim 3
With the configuration described above, thrust can be reliably generated even when the load is lost in the latter half of the feeding. Therefore, it is possible to continuously and reliably send out the rail from the start end to the end of the rail by the truck.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a delivery method of the present invention.

FIG. 2 is a side view showing a self-propelled carriage on an assembly yard and a feed carriage on a pier.

FIG. 3 is a perspective view showing a self-propelled carriage.

FIG. 4 is a cutaway enlarged side view of the same portion.

5 is a vertical sectional view taken along line (5)-(5) of FIG.

FIG. 6 is a plan view showing a feed table.

FIG. 7 is a cross-sectional view taken along line (7)-(7) of FIG.

FIG. 8 is an explanatory view showing a state in which the self-propelled carriage and the feed base are adjusted and sent out.

FIG. 9 is an explanatory view showing the sending out of the curve.

[Explanation of symbols]

A ... Assembly yard B1-B5 ... Pier C ... Self-propelled carriage D ... Feed stand 1, 1 '... Rail 2 ... Lifter mechanism 3 ... Lateral movement mechanism 4 ... Brake mechanism 5 ... Friction imparting mechanism c ... Truck block 6 ... Frame 7 … Drive mechanism

Claims (3)

[Claims] 1. A method of constructing a bridge girder by sending it out from an assembly yard to a pier in front of the pier, and mounting a bogie capable of traveling by itself or a bogie traveling by an external force on parallel rails laid in the assembly yard, The feed platform is mounted on the pier, and the cart is provided with a lifter mechanism capable of moving up and down the supported bridge girder, and a lateral movement mechanism for moving and adjusting the mounted bridge girder in a direction orthogonal to the sending direction. And a method for sending out a bridge girder, characterized in that the bridge girder is sent out by running the trolley from the start end to the end of the rail while operating the lateral movement mechanism. 2. The trolley comprises a frame having a length straddling a rail laid in parallel, a drive mechanism having wheels running on an upper surface of the rail suspended from the frame according to the rail width, and a frame. The method of sending out bridge girders according to claim 1, wherein the bogie block is a self-propelled bogie in which at least two bogie blocks having a pair of left and right lifter mechanisms which can be moved up and down are arranged on the upper surface of the rail in accordance with a substantially rail width. . 3. The truck according to claim 2, further comprising a friction imparting mechanism for imparting a frictional force between the truck and the rail, thereby preventing wheel slippage and feeding the bridge girder when the truck travels. Method for sending out bridge girders.