JP2004346728A - Method of send-out bridge girders, and device used for sending - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously send bridge girders forward at each pier with which the web position is displaced as the girder is sent out in the bridge axis direction. <P>SOLUTION: While the bridge girders are being assembled in an assembly yard located on this side of the pier where the girders are placed, supported and continuously being sent out in the bridge axis direction on a mobile carriage running on rails laid on the assembly yard, a guide device 11 guiding a lower flange of a web W at the side where the web position varies is moved in a direction crossing the bridge girders on a pier P after receiving a vector of the lower flange F which is converted from a send-out force from the girder; and a send-out device 1 of the web W is driven by the moving power of the guide device 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for feeding a bridge girder and a feeding device used for the same, and more particularly, a method for continuously feeding a bridge girder such as a wide girder having a linear inclined girder, a widening girder expanding in one direction, a curved girder, and a feeder used for the same. It concerns the device.

  In the conventional bridge girder feeder, a pair of left and right guide devices are provided at the front and rear positions of a horizontal feeder comprising crawlers installed on each pier, and the bridge girder is guided by the pair of left and right guide devices to guide the bridge girder. There is already known a method in which a web of a bridge girder is mounted on a horizontal feeder and fed safely (for example, see Patent Documents 1 and 2).

In the prior art, the pair of left and right guide devices are provided with an urging means and a direction correcting / combined reaction force measuring means to regulate and correct the feed direction of the bridge girder, and to feed the bridge girder with respect to a large change in the bridge girder feed. Can be stopped.
By the way, the bridge girder includes a wide girder composed of a plurality of girder having a straight inclined girder as shown in FIG. 6, a wide girder expanding in one side direction as shown in FIG. 10, a curved girder as shown in FIG. There is.
In FIG. 6, one to several linear girders whose width dimension does not change, and a linear inclined girder (tilt in plan view) whose width dimension does not change but are inclined with respect to the linear girder, are shown in FIG. One side edge of the widening girder is constituted by an inclined web which is inclined in a plan view, and in FIG. 14, both right and left side edges are constituted by a curved web which is curved in a plan view.
Conventionally, when such a wide girder (FIGS. 6 and 10) and a curved girder (FIG. 14) are fed onto each pier, if the web position is displaced in accordance with the feed of the bridge girder, a temporary support assembled on the pier is conventionally used. Once the bridge girder is re-arranged by the sander, the horizontal feeder is moved immediately below the displaced web, and the so-called bridge girder rearrangement work and the horizontal feeder moving operation are alternately repeated to increase the width of the girder (see FIG. 6 and FIG. 10), coping with the feed of the bridge girder such as the curved girder (FIG. 14) in the bridge axis direction.
However, the continuous feed of the bridge girder is stopped by the work of changing the bridge girder and the movement of the horizontal feeder. In addition, since it is necessary to safely send the bridge girder by mounting the web on the intermediate part of the feed surface in the horizontal feeder, it must be re-arranged and moved frequently, making the feed efficiency extremely poor and prolonging the construction period. Invite.
In addition, the work of changing the bridge girder and the work of moving the horizontal feeder need to be performed frequently at a plurality of locations at different positions on each pier, and since the altitude is high, the sandals for temporary receiving and the horizontal feeder are required. The operation of assembling and removing the supporting sandals is complicated and very dangerous.
It should be noted that the prior art document relating to the above-described method of feeding a widened girder or a curved girder and a device therefor is unknown to the applicant.
JP-A-2002-121708 (page 4, FIG. 3, FIG. 5) JP 2001-81730 A (Page 1, Page 2, FIG. 1 and FIG. 2)

  The present invention has been made in view of the above-described conventional circumstances, and a purpose thereof is to provide a bridge girder delivery method and a bridge girder for continuously delivering a bridge girder whose web position is displaced along with the delivery in the bridge axis direction to the front of each pier. It is to provide a feeding device to be used.

A technical measure taken to solve the above problem is a method of feeding a bridge girder in which the web position is displaced with the feeding in the bridge axis direction, and assembling the bridge girder in an assembly yard installed on the front side of the pier. While continuously feeding in the direction, the guide device that guides the lower flange on the side where the web position is displaced is moved in the direction intersecting with the bridge girder on the pier receiving the vector of the lower flange converted from the feeding force of the bridge girder. A method for feeding a bridge girder, wherein the web feeder is driven by the moving force of the guide device (claim 1).
Also, a method of feeding a wide girder or a curved girder in which the left and right web positions are displaced while maintaining a predetermined distance in accordance with the feeding in the bridge axis direction, wherein the bridge girder is assembled while being assembled at an assembly yard installed in front of the pier. A guide device that guides the lower flange of the bridge girder while continuously sending it out in the axial direction is maintained at a predetermined interval in the direction intersecting with the bridge girder on the pier receiving the vector of the lower flange converted from the feeding force of the bridge girder. And the horizontal feeder for the left and right webs is driven by the moving force of the guide device (claim 2).
Here, continuous feeding means, for example, each time the bridge girder is assembled to the rear end of the bridge girder at the assembly yard, for example, a predetermined amount until the bridge girder tip is sequentially mounted on the horizontal feeder of the front pier. (Hundreds of meters) from the assembly yard or tow it continuously.
It is preferable that the delivery is performed by mounting a bridge girder on a self-propelled vehicle running on a rail laid in an assembly yard and running the self-propelled vehicle (claim 3). In other words, every time the bridge girder is assembled to the rear end of the bridge girder at the assembly yard, the bridge girder is mounted on the horizontal feeder of the pier and the rear end of the bridge girder is mounted on the temporary support stand for bogie replacement. A predetermined amount is sent out by a self-propelled carriage carrying a bridge girder.

According to the first aspect, the web is placed on the movement of the guide device which moves in the direction intersecting with the bridge girder by receiving the vector of the lower flange on the side where the position is displaced with the continuous feeding of the bridge girder in the bridge axis direction. The wide feed girder as shown in FIG. 10 can be continuously fed by following a continuous feeder that is driven to follow the continuous feed.
According to the second aspect, it is possible to continuously feed a wide-width girder linearly inclined girder as shown in FIG. 6 or a curved girder as shown in FIG.

  2. A feeding device used in the feeding method according to claim 1, wherein a guide device for guiding a lower flange on a web side which is displaced with the feeding of the bridge girder in a bridge axis direction is provided on a pier by receiving a vector of the lower flange. It is configured to be slidable in a direction intersecting with the bridge girder, and the horizontal feeder for the web is driven by the guide device by the moving force of the guide device. 2. A feeding device used in the feeding method according to claim 1, wherein a guide device for guiding a lower flange on a web side which is displaced with the feeding of the bridge girder in a bridge axis direction is provided on a pier by receiving a vector of the lower flange. It is slidable in a direction intersecting with the bridge girder, and a horizontal feeding device for the web is mounted on a sliding portion of the guide device. 3. A feeding device used in the feeding method according to claim 2, wherein the left and right guide devices for guiding the lower flange are slidable on the pier in a direction intersecting with the bridge girder by receiving a vector of the lower flange. Each of the left and right web horizontal feeders is attached to each of the sliding portions of the left and right guide devices to form left and right feed portions, and the left and right feed portions are connected (claim 6). 3. A feeding device for a curved girder used in the feeding method according to claim 2, wherein left and right guide devices for guiding the lower flange are slidable in a direction intersecting with the bridge girder on a pier receiving a vector of the lower flange. At the same time, the left and right web horizontal feeders are attached to each of the sliding portions in the left and right guide devices to form left and right feed portions, and the left and right feed portions are connected, and the feeder of the horizontal feed device is connected. The swing angle can be adjusted, the contact force with the lower flange generated in the guide function section of the guide device is constantly detected, and the swing amount of each feed body of the horizontal feed device is controlled based on the data to control the swing amount during feeding. The feeder is directed in the tangential direction of the web (claim 7). And so on.

As described above, the present invention converts the guide device that guides the lower flange on the side where the web position is displaced from the feeding force of the bridge girder while sending out the bridge girder in the assembly yard installed in front of the pier while assembling the girder in the bridge axis direction. A method of feeding a bridge girder receiving a vector of a lower flange to be moved on a pier in a direction intersecting the bridge girder, and causing a web feeder to be driven by the moving force of the guide device (claim 1).
Therefore, every time a series of operations are performed to change the supporting sandals for installing the horizontal feeder and to temporarily move the supporting sandals, the width of the bridge girder is increased in one direction as shown in FIG. 10 without interruption. Can be continuously fed.
In addition, the present invention provides a method for feeding a wide girder or a curved girder in which the left and right web positions are displaced while maintaining a predetermined interval in accordance with the feeding in the bridge axis direction, wherein the assembling yard is installed in front of the pier. A guide device that guides the lower flange of the bridge girder while continuously sending it out in the bridge axis direction while assembling the bridge girder in the direction crossing the bridge girder on the pier receiving the vector of the lower flange converted from the feeding force of the bridge girder When it is configured to move at a predetermined interval and move the horizontal feeders of the left and right webs by the moving force of the guide device, a widening girder having a linear inclined girder as shown in FIG. A bridge girder such as a curved girder as shown in FIG. 14 can be continuously fed.
In addition, there is no need to perform any assembling and removing operations of the temporary receiving sandals and the supporting sandles, so that it is safe.

  Further, since the horizontal feeder is attached to the sliding portion of the guide device which slides on the pier in the direction intersecting the bridge girder in response to the vector of the lower flange, for example, a roller is mounted on the body of the horizontal feeder. Unlike a case where a guide function unit (for example, an endless roller unit) is attached via an arm, there is no possibility that a vector acting via the lower flange acts as a lateral overturning force of the horizontal feeder, so that sliding is ensured. (Claims 5-7).

  In addition, according to a sixth aspect, a bridge girder in which the left and right web positions are displaced while maintaining a predetermined interval, such as a linear inclined girder of a widening girder shown in FIG. Provided is a feeding device capable of continuously feeding even a curved girder in which the left and right web positions are displaced while maintaining a predetermined interval.

  Assembling the widening girder (widening girder that widens in one direction or widening girder having a straight inclined girder), curved girder, etc., with the web position displaced with the feed in the bridge axis direction, at the assembly yard provided on the front side of the pier Meanwhile, the assembled widening girder (widening girder expanding in one direction or widening girder having straight inclined girder), curved girder, etc. are mounted on a self-propelled bogie traveling on rails laid in an assembly yard and continuously. Send it out.

The widening girder that widens in one direction is a guide device that guides the lower flange on the side where the web position is displaced, and receives the vector of the lower flange converted from the feeding force of the widening girder, and the widening girder on the pier. The web is continuously fed by moving a horizontal feeder of the web with its moving force moved in the crossing direction.
Further, the widening girder having the linear inclined girder and the left and right guide devices of the curved girder are connected to each other by connecting the left and right feed portions formed by attaching the left and right web horizontal feeders to the left and right sliding portions, respectively. Be composed.
The widening girder and the bending girder having the linear inclined girder are the same as the widening girder and the bending girder on the pier by receiving the vector of the lower flange converted from the feeding force of the widening girder and the bending girder. The web is also continuously fed by following the left and right horizontal feeders that carry the web with the moving force that is moved in the direction crossing the spar.

1 to 8 show a first embodiment of a feeding method of a bridge girder feeding device and a feeding device used therefor.
A first embodiment of a feed method of a feeder for a bridge girder shown in the drawing and a feeder used for the first embodiment will be described. As shown in FIG. , A linear inclined girder (referred to as a linear inclined girder inclined in a plan view) a1 and a feeder used for the widening girder a, which is installed in an assembly yard Y. This is carried out using self-propelled vehicles M, M that self-propelled on the rails L, L, and a bridge girder feed device.

As shown in FIGS. 2 and 4, the self-propelled trolley M is configured by mounting a plurality of trolley blocks m on parallel rails L, L laid in an assembly yard Y.
The rails L, L are formed of a steel material having a desired longitudinal cross-sectional shape, and are arranged side by side at intervals of each web W, in the widened girder a.
As shown in FIGS. 2 and 3, the bogie block m suspends and supports a pair of left and right drive mechanisms m2 and m2 below the frame m1 having a length extending over the parallel rails L and L. A heavy-weight support plate m3 is arranged on the upper surface in accordance with the width of the rails L, L.

  In the present embodiment, the frame m1 is formed of a steel material having a substantially H-shaped cross section, and a pair of front and rear clevis-equipped vertical jacks J1 is provided between the upper flange m11 and the lower flange m21 in the longitudinal direction of the frame m1. The driving mechanism m2 is supported by a pair of vertical jacks J1 and J1 arranged on the left and right, respectively, according to the width of the rails L and L.

  The drive mechanism m2 rotatably supports the wheel O on the machine frame m22, and connects the rotation axis of the hydraulic motor K to the axis of the wheel O so that the wheel O runs on the rails L, L by itself. Has become.

The heavy load supporting plate m3 is attached to a hydraulic jack J2 for vertical height adjustment supported through the upper flange m11 of the frame m1, and the guide jack formed with the hydraulic jack J2 in the upper flange m11. The left and right hydraulic jacks J2 are connected by a double rod type hydraulic jack J3 supported on the frame m1, and the heavyweight support plate m3 is supported by operating the hydraulic jack J3. The left and right hydraulic jacks m2, m2 can be controlled to move in the left-right direction in the guide elongated hole m31 while maintaining an interval between them.
In addition, a friction applying means is provided on the contact surface between the rail L and the wheel O.
The friction applying means may be constituted by a rack L1 formed on the upper surface of the rail L and a toothed gear O1 integrally formed on the wheel O, or a wheel O mounted on the upper flange upper surface of the rail L, It is proposed to adopt a clamping structure in which the pressing member O2 presses and contacts the lower surface of the upper flange L with a pressing structure (see FIG. 3).

  The feeder will be described with the device portion for a linear inclined girder being referred to as a first feeder 1 and the device portion for a linear girder being referred to as a second feeder 2.

  As shown in FIGS. 7 and 8, the first feeding device 1 includes left and right guide devices 11 for guiding a lower flange F of a side edge of a linear inclined girder a1 and a feeding body (crawler) for supporting a web W. ) The left and right feed portions 21, 21 constituted by the horizontal feed device 31 having the 31 a can be guided on the pier P by guide means 41 provided in a direction intersecting (for example, orthogonally) with the linear inclined girder a 1. The feeding portions 21 are connected to each other.

As shown in FIGS. 7 and 8, the guide device 11 includes a pair of front and rear guide function portions (endless roller portions) 111 for guiding the lower flange F of the linear inclined girder a1 and a base plate as a sliding portion 112. (Hereinafter referred to as 112) and supported by a roller arm 113 standing upright.
The guide means 41 has long guide rails 411, 411 standing on the pier P at predetermined intervals in a direction orthogonal to the linear inclined girder a1, and suppresses sliding resistance over the entire length. A sliding auxiliary body 412 with rollers or a sliding auxiliary body guided by a ball rotating body such as a ball bearing is laid, and the sliding auxiliary body 412 is provided with the base plates 112 of the left and right guide devices 11, 11. Each 112 is slidably engaged and mounted on the guide rails 411, 411.

  As shown in FIG. 8 and the like, the base plate 112 extends toward the center of the linear inclined girder a1 to a position just below the left and right horizontal feeders 31 and 31 or more.

Each of the horizontal feeders 31 has a body 311 supported via a plurality of vertical hydraulic jacks 312... As shown in FIGS. 7 and 8, and rotates an endless feeder (crawler) 31 a on the body 311. It is of a well-known configuration wound as much as possible.
In each of the horizontal feeders 31, the lower end of a vertical hydraulic jack 312 is placed on a base plate 112, and a body 311 having a feed body 31a is moved by a direction correcting hydraulic jack 313 arranged in front and rear directions to a predetermined width in the stroke direction. It is movable.
The direction correcting hydraulic jack 313 connects the cylinder side to the base plate 112 and connects the rod side to the jack support 314 through which the vertical hydraulic jacks 312. The body 311 is attached to each of the plates 112 and expands and contracts, so that the body 311 can move a predetermined width in the stroke direction on the upper surface of the base plate 112 as described above.
The left and right feed units 21 and 21 have the left and right airframes 311 and 311 connected to each other by connecting beams 51.

  The second feeder 2 directly or indirectly installs the left and right horizontal feeders 12 for receiving the web W on the pier P as shown in FIGS. 5 and 6 and guides the lower flange F. This is a known configuration in which the left and right guide devices 22 are erected from the pier P.

  Next, using the self-propelled bogie M and the feeder, the widening girder a composed of one or more linear girder a2 and a linear girder girder (referring to a linear girder inclined in plan view) a1 is used. The method of sending out and sending will be described. As shown in FIG. 1, each time the widening girder a is assembled in the assembly yard Y by using the guide function of the hand-rolling machine R, the widening girder a is sent out in the direction of the bridge axis to a predetermined length and is placed on each pier P. The widening digits a are successively sent. As shown in FIG. 4, the webs are fed to the left and right heavy-weight support plates m3 and m3 of the self-propelled vehicle M together with the linear girder a2 and the linear inclined girder (refer to the linear inclined girder inclined in plan view) a1 as shown in FIG. The operation is performed by driving the hydraulic motor K with the W and W mounted thereon to travel on the orbits L and L by itself. The self-propelled bogie M which supports the linear inclined girder a1 is adapted to correspond to the displacement of the webs W, W by controlling the hydraulic jack J3 to move the left and right heavy load supporting plates m3, m3. . Then, on the pier P, a vector generated in the feed direction (X: bridge axis direction) of the linear girder a2 and the direction of the linear girder a1 is transmitted from the lower flange F of the linear girder a1 to the guide device 11 in the first feeder 1. Of the left and right webs W, the bases 112 of the left and right guide devices 11, 11 each having the horizontal feeders 31, 31 mounted thereon are guided by the guide means 41 while the left and right webs W, W are mounted. 6 and a widening girder a shown in FIG. 6 (one to several linear girder whose width dimension does not change, and a linear inclined girder which does not change its width but tilts with respect to the linear girder). (Incl. Plan view)).

Next, a second embodiment shown in FIGS. 9 to 12 will be described. This embodiment shows a method of feeding a widened girder a widening in one side direction and a feeding device used for the method. The self-propelled vehicle M used in this feeding method is the same as the self-propelled vehicle described in the first embodiment, except that the heavy object support plate m3 corresponding to the non-widened side is not movable in the left-right direction. Only the weight support plate m3 can be controlled to move in the widening direction by the hydraulic jack J3 so as to correspond to the web W.
The feeding device will be described as a first feeding device 1 which is a device portion for a widened side edge, and a device portion for a non-widened side edge will be referred to as a second feeding device 2. The second feeding device 2 will be described above. The first feeding device 1 has the same configuration as that of the first embodiment, and the first feeding device 1 of the first embodiment shown in FIGS. It has become.
Further, the first feeding device 1 can be guided by the guide means 41 provided in a direction intersecting (for example, orthogonally) with the web W inclined in plan view.

  Next, a method of sending out the widening girder a which widens in one direction using the self-propelled carriage M and the feeding device will be described. As in the case of the first embodiment, a hand-rolling machine R is used. Each time the widening girder a is assembled in the assembly yard Y, the widening girder a is sent out in the direction of the bridge axis to a predetermined length, and the widening girder a is sequentially sent onto each pier P. As shown in FIG. 9, the web W is mounted on a heavy-weight support plate m3 that is configured to be able to control the movement on the widening side. Then, a vector generated in the feeding direction (X: bridge axis direction) of the widening girder a on the pier P and the direction of the lower flange F on the widening side is transmitted to the endless roller portion 111 of the guide device 11 in the first feeding device 1. When actuated, the bases 112, 112 of the left and right guide devices 11, 11 to which the horizontal feeders 31, 31, respectively, are attached while the left and right webs W, W are mounted as shown in FIG. The widening girder a is continuously fed following the widening.

Next, a third embodiment shown in FIGS. 13 to 16 will be described. This embodiment shows a method of feeding a curved girder a3 such as an S-shaped girder and a feeding device used for the same.
In this embodiment, the self-propelled trolley M used in the first embodiment and the first feeder 1 for a linear inclined girder shown in the first embodiment are used as feeders. .
The right and left feed portions 21, 21 connected by the connecting beam 51 in a direction orthogonal to the sending direction X of the curved girder a3 receive the vector by the guiding action of the guiding means 41 and slide. The contact force of the first feeder 1 with the lower flange F acting on the endless roller portions 111 of the guide devices 11, 11 is always detected, and the data is used to control the amount of swing of each feeder 31a. The feed body 31a can be directed in the tangential direction of the left and right webs W, W at the time of feeding.

As shown in FIG. 15 and the like, each of the horizontal feeders 31 is accommodated in an upwardly-facing U-shaped support 31b attached to the base plate 112, and the cylinder side of the hydraulic jack 313 for correcting the direction is attached to the support 31b. The rod side of the hydraulic jack 313 for correcting the same direction is connected to a jack support 314 through which the vertical hydraulic jacks 312 are penetrated, and the jack support 314 (horizontal feed device 31) is further shifted rearward in the feeding direction (X). Is set as a swing center axis D, and is supported so that the swing angle can be adjusted and translated with respect to the support 31b.
In FIG. 15, reference numeral 31c denotes a guide elongated hole provided in the jack support 314, and an upper end of a swing center axis D having a lower end fixed to the support 31b is movably engaged with a hole edge of the guide elongated hole 31c. Thus, the swing angle can be adjusted around the engaging portion.

In the case of the curved girder a3, since the web W is not a straight line, it is necessary to direct the left and right feeders 31a in the tangential direction of the web W when continuously feeding the web W in accordance with the curvature.
Therefore, in this embodiment, the contact force between the endless roller portion 111 and the lower flange F is continuously detected by the pressure detecting means S, and the swing angle of the feeder 31a is determined according to the pressure data. Is automatically adjusted via a control unit (not shown) to enable continuous feeding.
That is, when the curvature of the web W is large, the contact force acting on the endless roller portion 111 is small, and when the curvature is small, the contact force is large. This is continuously detected by the pressure detecting means S, and the swing angle of the feed body 31a is adjusted by an amount corresponding to the detected value, so that the feed body 31a is directed in the tangential direction of the left and right webs W, W. Continuous feed is possible.
If the horizontal feeder 31 uses the swinging center axis D of the feeder 31a near the bridge girder sending direction, the area on the front side in the feeding direction centered on the swinging center axis D is large and large frictional resistance is generated. Since the feeder 31a is produced, the feeder 31a is easily oriented in the same direction as the web W, and the horizontal feeder 31 does not need to be installed on the pier P with high accuracy.
Then, when the curved girder a3 is sent out by the self-propelled bogie M by a predetermined amount in the bridge axis direction (X) while assembling the curved girder as a bridge girder at the rear end side in the assembly yard, the left and right webs W, The base plates 112, 112 of the left and right guide devices 11, 11 to which the horizontal feed devices 31, 31 are attached in vector are slid while being guided in the tangential direction of W by the guide means 41. , And are continuously sent out following the curve.

  As the horizontal feeder of the first feeder in the first and second embodiments, in the third embodiment, the swing angle can be adjusted and a predetermined width can be moved in the stroke direction of the direction correcting hydraulic jack. The horizontal feeder shown may be used.

Further, as the guide means of the first feeder and the second feeder, the base plate (sliding moving body) of the guide device is not provided with a peer as shown in FIG. It is also possible to adopt a structure in which a guide is provided by a floating mechanism provided at an appropriate distance from the upper surface.
The floating mechanism communicates the push-up liquid chamber 3 with a lower liquid chamber 4 having a smaller cross-sectional area than the push-up liquid chamber 3 and opening to the upper surface of the pier P, and the upper and lower liquid chambers 4 The movable sleeve 5 is fitted in a liquid-tight manner, the lower end of the sleeve 5 is brought into contact with the upper surface of the pier P, and oil is sealed in the push-up liquid chamber 3 and the lower liquid chamber 4. This is a structure in which the base plate 112 of the guide device 11 is supported by the rod 16 of the piston 6 provided (see the prior art described in Japanese Utility Model Publication No. 1-20323).
In this structure, when a bridge girder load is applied via the base plate 112, the hydraulic pressure in the liquid chamber increases due to the load, and the upward floating pressure is increased by making the cross-sectional area of the push-up liquid chamber 3 larger than that of the lower liquid chamber 4. By working, the load applied to the pier P is reduced, and the sliding resistance during the movement of the base plate 112 can be suppressed to a very small value, which is suitable as a guide structure for suppressing the sliding resistance to a smaller value. Reference numeral 7 denotes a chill roller for guiding the base plate 112.

The self-propelled bogie used in the delivery method of the first embodiment uses a widening girder (one to several linear girder whose width dimension does not change, and a linear inclined girder whose width dimension does not change but is inclined with respect to the linear girder). FIG. 4 is a schematic side view showing a use state in which (tilt in plan view) is being delivered. The expansion perspective view of a self-propelled trolley. The self-propelled truck is shown partially enlarged in an enlarged side view. The top view showing the state where the widening girder is sent out from the assembly yard by the self-propelled trolley. FIG. 2 is a front view showing a state where a bridge girder is being sent out onto a pier by a feeder used in the sending out method according to the first embodiment. FIG. FIG. 2 is an enlarged plan view of a feeding device used in the first embodiment. FIG. 8 is a sectional view taken along line (8)-(8) of FIG. 7. The top view showing the state where the curved girder is sent out from the assembly yard by the self-propelled carriage used for the sending-out method of the second embodiment. FIG. 9 is a plan view showing a state where a curved girder is being sent out by a feeder used in the feeding method according to the second embodiment. FIG. 4 schematically shows an enlarged plan view of a feeder used in the second embodiment. FIG. 12 is a sectional view taken along line (12)-(12) of FIG. 11. The top view showing the state where the curved girder is sent out from the assembly yard by the self-propelled carriage used for the sending-out method of the third embodiment. FIG. 14 is a plan view of a feeding device used in the feeding method according to the third embodiment. FIG. 14 is an enlarged sectional view taken along line (14)-(14) of FIG. 13. The expanded sectional view of the modification of a guidance means.

Explanation of reference numerals

M: Self-propelled truck L: Track
Y: Assembly yard X: Bridge axis direction
P: Peer 1: First feeder
2: Second feeder 31: Horizontal feeder 11: Guide device F: Lower flange 31a: Feeder (crawler) W: Web
a: Widening girder a2: Straight girder a1: Linear inclined girder 41: Guide means 112: Sliding part (base plate) 21: Feeding part 111: Guide function part (endless roller part)
a3: Curved girder

Claims (7)

This is a method of feeding a bridge girder whose web position is displaced in accordance with the feeding in the bridge axis direction, wherein the web position is displaced while continuously sending out the bridge girder while assembling the bridge girder in an assembly yard installed in front of the pier. The guide device for guiding the lower flange is moved in a direction intersecting the bridge girder on the pier in response to the vector of the lower flange converted from the feed force of the bridge girder, and the horizontal feeding of the web is performed by the moving force of the guide device. A method for feeding a bridge girder, characterized by causing a device to be driven. A method of feeding wide and curved girders and curved girders in which the left and right web positions are displaced while maintaining a predetermined spacing as they are sent out in the direction of the bridge axis. The guide device that guides the lower flange of the bridge girder while continuously feeding the bridge girder moves at a predetermined interval in the direction intersecting with the bridge girder on the pier receiving the vector of the lower flange converted from the feeding force of the bridge girder And a horizontal feeder for the left and right webs is driven by the moving force of the guide device. 3. The method according to claim 1, wherein the feeding is performed by mounting a bridge girder on a self-propelled bogie traveling on a rail laid in an assembly yard, and running the self-propelled bogie. 4. 2. A feeding device used in the feeding method according to claim 1, wherein a guide device for guiding a lower flange on a web side which is displaced with the feeding of the bridge girder in a bridge axis direction is provided on a pier by receiving a vector of the lower flange. A feeder for a bridge girder, which is slidable in a direction intersecting with the bridge girder, and wherein a horizontal web feeder is driven by the guide device by the moving force of the guide device. 2. A feeding device used in the feeding method according to claim 1, wherein a guide device for guiding a lower flange on a web side which is displaced with the feeding of the bridge girder in a bridge axis direction is provided on a pier by receiving a vector of the lower flange. A feeder for a bridge girder, which is slidable in a direction intersecting with the bridge girder, and wherein a horizontal web feeder is attached to a sliding portion of the guide device. 3. A feeding device used in the feeding method according to claim 2, wherein the left and right guide devices for guiding the lower flange are slidable on the pier in a direction intersecting with the bridge girder by receiving a vector of the lower flange. A feeder for a bridge girder, wherein horizontal feeders for the left and right webs are attached to sliding portions of the left and right guide devices to form left and right feeders, and the left and right feeders are connected. 3. A feeding device for a curved girder used in the feeding method according to claim 2, wherein left and right guide devices for guiding the lower flange are slidable in a direction intersecting with the bridge girder on a pier receiving a vector of the lower flange. At the same time, the left and right web horizontal feeders are attached to each of the sliding portions in the left and right guide devices to form left and right feed portions, and the left and right feed portions are connected, and the feeder of the horizontal feed device is connected. The swing angle can be adjusted, the contact force with the lower flange generated in the guide function section of the guide device is constantly detected, and the swing amount of each feed body of the horizontal feed device is controlled based on the data to control the swing amount during feeding. A feeder for a bridge girder, wherein the feeder is directed in a tangential direction of a web.

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