JP2006169791A - Construction method and control system for incrementally launching bridge girder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method and a control system for incrementally launching a bridge girder, which make the bridge girder smoothly launched by concurrently using a extrusion jack along with a self-propelled incremental launching truck. <P>SOLUTION: In this construction method for incrementally launching the bridge girder, the bridge girder, the leading end of which is connected to a launching machine, is placed and supported on the plurality of longitudinally arranged launching trucks 10 and 20, and erected by being launched from one bridge pier to the other bridge pier. The launching machine is self-propelled by having wheels rotated by driving motors 18 and 28 mounted on the launching trucks, until the launching machine reaches the bridge pier as a launching destination. The incremental launching truck is pushed out and moved by the extrusion jack 32, after the launching machine reaches the bridge pier as the launching destination. The driving motors 18 and 28 are driven for a given length of time, when extrusion is started by the extrusion jack 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bridge girder delivery method employed in the construction work of a bridge that crosses a river or a railroad and bridges the bridge girder, and a delivery control system for executing the method, and a hand connected to the tip. The present invention relates to a bridge girder delivery method and a delivery control system in which a self-propelled delivery carriage is pushed out using an extrusion jack after a total machine reaches a delivery destination pier.

Conventionally, in the construction of bridges, the sending-out method has been adopted as a construction method when the space under the girder cannot be used, such as when a railway or road passes under the bridge girder to be constructed, or when straddling rivers or lakes. Has been. FIG. 4 is a diagram showing a bridge girder sending-out method carried out at a site crossing the track.
In the bridge erection work shown in the figure, the bridge girder 101 and the like are suspended by a crane on pre-constructed piers 111 to 113, but cranes are not installed on the piers 114 and 115 that cross the track where the space under the girder cannot be used. Since it is impossible, the delivery method is adopted.

Temporary equipment 120 is assembled for delivery in the piers 114 and 115, and a horizontal traveling rail 130 is installed thereon. The delivery carts 10 and 20 move on the traveling rail 130, and the bridge girder 102 and the handrail 140 mounted on the delivery carts 10 and 20 are delivered in the direction indicated by the arrows.
The delivery carts 10 and 20 travel on the three traveling rails 130 and are provided with three vertical jacks so that the vertical jack strokes are distributed as evenly as possible in each place. Adjusted. Here, FIGS. 5 and 6 are diagrams schematically showing the delivery carts 10 and 20 at the time of delivery equipped with the bridge girder 102, in particular FIG. 5 is a side view of the delivery cart, and FIG. The front of the dolly is shown.

The delivery carts 10 and 20 are self-propelled carts including running units 11 and 21 in which front and rear wheels that roll on the running rail 130 are rotated by a drive motor (not shown). Vertical jacks 12 and 22 are erected at three locations corresponding to the traveling rail 130 via lower frames 13 and 23, and bridge girders 102 are placed on the vertical jacks 12 and 22 via upper frames 14 and 24. It is done. The delivery carts 10 and 20 support the bridge girder 102 at three locations where the vertical jacks 12 and 22 are arranged in the lateral direction, respectively, so that the load due to the height difference of about several millimeters generated between the three traveling rails 130 is supported. Even when the load is largely biased, the load is adjusted by controlling the stroke based on the data of the pressure sensor provided in each of the vertical jacks 12 and 22.
JP 2003-278114 A (page 3-5, FIGS. 1 to 5)

In such a bridge girder delivery method, as shown in FIG. 4, the bridge girder 102 is moved on the temporary equipment 120 by the front and rear delivery carts 10 and 20, and the handrailer 140 reaches the destination pier 115. Then, a part of the load of the bridge girder 102 and the hand spreader 140 that had been applied only to the delivery carts 10 and 20 until then moves to the pier 115 side, and the adhesive force between the traveling rail 130 and the wheels of the delivery carts 10 and 20. Falls and causes slipping.
That is, the caterpillar 150 is installed on the bridge pier 115, and the loads of the bridge girder 102 and the spreader 140 are supported by the caterpillar 150 in addition to the two delivery carts 10 and 20.

  However, the loads of the bridge girder 102 and the handbill 140 are thus shared by the caterpillar 150 on the pier 115, and the load that has been acting only on the two delivery carts 10 and 20 until then is halved. . Until then, the wheels of the delivery carts 10 and 20 were pressed against the traveling rail 130 by the load of the bridge girder 102 and the handrail 140, thereby obtaining the adhesive force that the wheels roll on the traveling rail 130. However, if the load that presses the wheel against the traveling rail 130 is reduced, the adhesive force is insufficient, causing the wheel to run idle, making it impossible for the delivery cart to travel appropriately.

  Therefore, in order to solve such problems, the present invention provides a bridge girder delivery method and a delivery control system for smoothly delivering a bridge girder by using an extrusion jack together with a self-propelled delivery carriage. Objective.

In the present invention, a bridge girder having a handrail connected to the tip is placed on and supported on a plurality of delivery carts arranged in the front-rear direction, and the bridge girder is moved from one pier to the other by movement along the traveling rail of the delivery cart. This is a bridge girder delivery method constructed by sending it out to the pier of the pier, so that it will self-propelled by the rotation of the wheels by the drive motor mounted on the delivery carriage until the handrail reaches the destination pier. The delivery carriage is pushed out and moved by an extrusion jack after the hand reach has reached the delivery destination pier, and the drive motor is operated for a certain period of time when the extrusion by the extrusion jack is started. It is characterized by being driven.
Further, in the bridge girder feeding method according to the present invention, the extruded jack has clamping means capable of gripping the traveling rail, the traveling rail is gripped and released by the clamping means, and the expansion / contraction by the pushing jack is performed. The delivery cart is pushed out by repeating the process.

In addition, the present invention provides a bridge girder having a girder connected to the front end of the bridge girder on a plurality of delivery carts arranged in the front-rear direction, and supports the bridge girder on one pier by moving along the running rail of the delivery cart. Is a bridge girder delivery control system constructed by feeding from one to the other bridge pier, wherein the delivery carriage is a self-propelled type in which wheels are rotated by a drive motor, and is pushed onto one or more delivery carriages. A jack is connected, and has a control device that controls the drive of the drive motor and the expansion / contraction of the extrusion jack, and the control device until the reach reaches the delivery destination pier. The delivery cart is self-propelled by rotation of a wheel by a drive motor, and after the hand reach reaches the delivery destination pier, the delivery cart is pushed out and moved by an extrusion jack. And it is as hereinbefore performs extrusion and the delivery by the extrusion jacks carriage, at the time of startup of the extrusion jack, characterized in that is obtained so as to drive the drive motor a predetermined time.
In the bridge girder delivery control system according to the present invention, the push-out jack has clamping means capable of gripping the traveling rail, and the control device grips and releases the traveling rail by the clamping means. The delivery cart is pushed out by controlling expansion and contraction of the extrusion jack.

  Therefore, according to the delivery method and delivery control system of the bridge girder according to the present invention, after the reach reaches the delivery destination bridge pier, it is switched from self-propelled by the delivery cart to extrusion by the extrusion jack. Therefore, the bridge girder is surely sent out even when the adhesive force of the wheel to the traveling rail is reduced. And since the wheel is rotated by energizing the drive motor for a certain period of time from the start of extrusion due to the extension operation of the extrusion jack, the activation resistance by the speed reducer is compensated by the driving force of the drive motor. Since it is only necessary to bear the running resistance, the bridge girder can be sent out smoothly, and further, it is not necessary to consider the resistance load of the reducer, so the extrusion jack and the clamping means are enlarged. There is no need.

Next, an embodiment of a bridge girder delivery method and delivery control system according to the present invention will be described below with reference to the drawings. Also in the present embodiment, a bridge girder delivery method executed at a site where a bridge girder is crossed across a railway line as shown in FIG. 4 and a delivery control system that executes the bridge girder will be described. Here, what is shown in FIG.5 and FIG.6 is employ | adopted for the delivery cart which comprises the delivery control system.
FIG. 1 is a diagram showing a delivery control system for delivering bridge girders in the present embodiment. In FIG. 1, only one of a plurality of identical components such as vertical jacks constituting the delivery carts 10 and 20 is shown, and the others are omitted.

  As described above, the delivery carts 10 and 20 are each provided with three vertical jacks 12 and 22 corresponding to the traveling rails 130. And in the delivery control system of this embodiment, these vertical jacks 12 and 22 are grouped for every cart, and reaction force management is performed separately before and after. This is because the distance between the delivery carts 10 and 20 is far enough not to be affected by the difference in the height of the jacks.

  The vertical jacks 12 and 22 are connected to a drive pump 1 that supplies and discharges pressure oil, and pressure sensors 15 and 25 that measure oil pressure are attached to the vertical pumps 12 and 22, respectively. Therefore, the load applied to each vertical jack 15, 25 can be measured by the reaction force by the pressure sensors 15, 25. Further, stroke detection sensors 16 and 26 for measuring respective strokes are attached to the vertical jacks 12 and 22, and are connected to the remote I / O boxes 17 and 27 together with the pressure sensors 15 and 25.

  The remote I / O boxes 17 and 27 are connected to the control computer 2, and the measurement data detected by the sensors 15, 16, 25, and 26 is a monitoring and control master in the monitoring room 50 built at the construction site. The computer 3 and the monitoring computer 4 are connected so as to be transmitted. On the other hand, the drive pump 1 is connected to the master computer 3 from the control computer 2 via the remote I / O box 37, and the drive control of the drive pump 1 and the like, that is, the delivery control of the bridge girder according to the program of the master computer 3 Is to be done.

The control computer 2 is connected to drive motors 18 and 28 for rotating the wheels of the delivery carts 10 and 20 shown in FIG. 5 via a cart travel control device 38, and in accordance with a control signal from the master computer 3. The drive motors 18 and 28 can be driven to switch the number of revolutions by switching the frequency of the inverter via a cart traveling control device 38.
Although not shown in detail, a large torque can be transmitted between the drive motors 18 and 28 to the wheels via a reduction gear having a large reduction ratio. Further, the delivery carts 10 and 20 are provided with electromagnetic brakes to stop the traveling.

Here, the extrusion carts 10 and 20 of the present embodiment are self-propelled by driving of the drive motors 18 and 28 included in the extrusion carts 10 and 20 and extrusion by expansion and contraction of the extrusion jack 32 provided for the forward extrusion cart 10. The traveling rail 130 can be moved forward. Here, FIG. 2 is a view showing the delivery carts 10 and 20 at the time of delivery equipped with the bridge girder 102, to which the extrusion jack 32 is connected.
The push-out jacks 32 are prepared corresponding to the three travel rails 130, the rods are respectively connected to the travel unit 11 from the rear, and the cylinder body is connected to the clamp means 33 for gripping the travel rails 130. The clamp means 33 includes a plurality of clamp cylinders 33a, and is configured to sandwich and hold the traveling rail 130 from the side by its extension operation.

  The vertical jacks 12 and 22, the push-out jack 32, and the clamp cylinder 33 provided in this delivery control system are all expanded and contracted by hydraulic control. Therefore, in addition to the vertical jacks 12 and 22, the drive pump 1 is connected to the push jack 32 and the clamp cylinder 33a of the clamp means 33 so that pressure oil is supplied and discharged. The push jack 32 and the clamp cylinder 33a are provided with a pressure sensor (not shown) that measures the pressure of the pressure oil to be supplied, and the expansion / contraction state can be detected from the pressure data.

  In such a delivery control system, a laser beam distance sensor 41 for measuring the delivery amount of the bridge girder 102, and Web cameras 42 and 43 for photographing the situation of the delivery carriage 10 in front and the delivery situation of the entire bridge girder 102 are installed. Are connected to the computers 3 and 4 through converters 45 to 48, respectively. Further, in this delivery control system, a person who is away from the construction site based on the reaction force information of the vertical jacks 12 and 22, the delivery state of the bridge girder 102, or the scene image from the Web cameras 42 and 43. You can also connect to a remote computer via a telephone line so that you can understand the situation.

Next, the bridge girder delivery method executed by the delivery control system will be specifically described.
The bridge girder 102 sent out at the construction site as shown in FIG. 4 is placed on the delivery carts 10 and 20 that move on the traveling rails 130 of the temporary equipment 120, and the handbill 140 is connected to the tip thereof. The self-propelled delivery carts 10 and 20 are moved forward by driving motors 18 and 28 via a cart travel control device 38 by a drive signal sent from the control computer 2. The rotations of the drive motors 18 and 28 are transmitted to the wheels via the speed reducer, and advance by the wheels rotating on the traveling rail 130. At this stage, the push-out jack 32 is not used, and the bridge girder 102 is fed out only by the self-propelling of the delivery carts 10 and 20. Therefore, the push-out jack 32 is only pulled according to the travel of the delivery carriage 10 with the clamp means 33 of the travel rail 130 in the released state.

  While the bridge girder 102 is mounted on the delivery carts 10 and 20 and moves, the loads of the bridge girder 102 and the handrailer 140 supported by the front and rear delivery carts 10 and 20 are three through the traveling units 11 and 21, respectively. Dispersed on the traveling rail 130. And when the height is slightly different between the traveling rails 130, a load such as the bridge girder 102 is applied to the increased height and the load balance is lost. At this time, the value of the reaction force applied to the vertical jacks 12 and 22 is detected, and such a load change can be confirmed by checking the reaction force of the vertical jacks 12 and 22.

  The reaction force data of the vertical jacks 12 and 22 detected by the pressure sensors 15 and 25 is always read by the control computer 2 and sent to the computers 3 and 4 in the monitoring room 50. The reaction force data is graphed and displayed on the display of the master computer 3. In addition to the reaction force of the vertical jacks 12 and 22, the moving distance is measured by the laser beam distance sensor 41, and the strokes of the vertical jacks 12 and 22 can be confirmed by the stroke detection sensors 16 and 26. , 4 are displayed as appropriate.

In the master computer 3, the strokes of the vertical jacks 12, 22 are set by the stored reaction force control program so that the load applied to each traveling rail 130 is equal based on the measurement data transmitted from the pressure sensors 15, 25. Adjusted reaction force management control is performed.
This reaction force management control avoids a situation where the load is concentrated on some of the traveling rails 130 and the traveling must be stopped urgently. Therefore, it is possible to maintain the stable traveling and complete the delivery of the bridge girder 102 in a short time.

  As the delivery carts 10 and 20 travel, the bridge girder 102 is gradually delivered from the position shown in FIG. 4, and the spreader 140 connected to the tip reaches the delivery destination pier 115. Then, when the hand-roller 140 reaches the pier 115, the load that has been applied to the delivery carts 10 and 20 until then is borne on the pier 115 side. For this reason, the load holding the wheels of the delivery carts 10 and 20 against the traveling rail 130 is reduced by half, and the adhesive force for the wheels to move forward by catching the rails cannot be obtained sufficiently, causing idling. Therefore, in the present embodiment, after the hand-roller 140 reaches the pier 115, the operation is switched from the self-propelled delivery carts 10 and 20 to the extrusion by the extrusion jack 32.

For delivery using the extrusion jack 32, the clamp means 33 that receives the reaction force during extrusion grips the traveling rail 130. For this purpose, pressure oil is supplied from the drive pump 1 to the clamp cylinder 33a of the clamp means 33, whereby the clamp cylinder 33 is extended to clamp the traveling rail 130. Thereafter, when the extrusion jack 32 is extended by receiving the pressure oil supplied from the drive pump 1, the extrusion jack 32 supported by the clamp means 33 extends forward, and the delivery carriage 10 is moved by the propulsive force obtained by such extrusion. Advance.
The rear delivery cart 20 moves along the front delivery cart 10 while supporting the bridge girder 120, and the bridge girder 102 is fed forward together with the spreader 140 supported by the caterpillar 150 on the bridge pier 115.

By the way, in the delivery carts 10 and 20, the reduction gear provided between the wheels from the drive motors 18 and 28 existing in the traveling units 11 and 21 becomes a large resistance when the push-out jack 32 is activated due to the large reduction ratio.
Therefore, an extrusion jack that simply outputs the propulsive force necessary to push out the bridge girder 102 is not sufficient as it is, and it is necessary to use a large extrusion jack that exhibits a propulsive force that can overcome the starting resistance of the reduction gear. Arise. In addition, when such an extrusion jack is used, a strong clamp cylinder is required so that the traveling rail 130 can be securely gripped without the clamp means 33 slipping due to the reaction force. Therefore, not only the extrusion jack 32 but also the clamping means 33 must be enlarged.

Therefore, in the present embodiment, when the operation is switched to the delivery by the push-out jack 32, the resistance by the speed reducer is suppressed in order to reduce the starting resistance by the push-out. That is, in conjunction with the operation of the push-out jack 32, the drive motors 18 and 28 of the delivery carriage 10 are driven, and the drive motors 18 and 28 are burdened with the starting resistance by the speed reducer.
FIG. 3 is a diagram showing the operation timing when the operation is switched to the delivery by the extrusion jack 32. In the present embodiment, an extrusion control program is stored in the master computer 3 so that the extrusion jack 32, the clamp cylinder 33a, and the drive motors 18 and 28 are operated at this timing.

  Therefore, first, at A1 before the push-out jack 32 is operated, the clamp cylinder 33a of the clamp means 33 is extended, and the traveling rail 130 is pressed from the side to be clamped. After gripping the traveling rail 130 in this way, the push-out jack 32 is extended at B1 to start the push-out of the delivery carriage 10, and the drive motors 18 and 28 are driven at C1 at the same timing as B1. Accordingly, the push-out jack 32 is gradually extended by receiving the pressure oil supplied from the drive pump 1 and the delivery cart 10 is pushed out, and the drive motors 18 and 28 are driven by the delivery carts 10 and 20 themselves. The wheel rotates. The drive motors 18 and 28 are not driven until B2 where the push-out jack 32 extends for the entire stroke, but are driven only for a certain period of time until C2 when the delivery carts 10 and 20 are advanced to some extent. This is because the driving motors 18 and 28 have only to bear the starting resistance applied to the speed reducer in the delivery carts 10 and 20 at the start of extrusion.

After C2 when the drive motors 18 and 28 are stopped, the clamp means 33 continues to grip the traveling rail 130, and the push-out jack 32 continues to extend, so that the delivery cart is driven by the propulsive force obtained by the push-out. 10 moves forward.
Thereafter, the supply of the pressure oil is stopped at B2 when the push-out jack 32 reaches the maximum stroke, and the extension operation is stopped. Therefore, the traveling of the delivery carts 10 and 20 stops and the delivery of the bridge girder 102 is temporarily stopped.

  Then, the stroke of the extrusion jack 32 is shortened to return to a state where the extrusion can be performed again. For this purpose, the clamp cylinder 33a of the clamp means 33 is contracted at A2 after a predetermined time from B2 when the extension operation of the push-out jack 32 is stopped, and the grip of the traveling rail 130 is released. After that, the extrusion jack 32 is contracted by reversing the pressure oil supply / discharge at B3. At this time, since the delivery carriage 10 is in a stationary state with a brake applied, when the push-out jack 32 contracts, it is pulled to move the position of the clamp means 33 forward. The contraction operation of the extrusion jack 32 is performed in a short time of B3 to B4.

  Thereafter, at each timing shown in FIG. 2, the driving motor 18 at the time when the traveling rail 130 is gripped and released by the clamping means 33, the extension operation and the contraction operation by the push-out jack 32, and the extension operation of the push-out jack 32 starts. , 28 are repeated.

Therefore, in this embodiment, after the hand-roller 140 reaches the delivery destination pier 115, by switching from self-propelled by the delivery carts 10 and 20 to extrusion by the push-out jack 32, the adhesion force of the wheels to the running rails. The bridge girder 102 is reliably delivered even in a state in which the power is lowered.
In addition, when switching to extrusion by the extrusion jack 32, the driving motor 18 and 28 are energized for a predetermined time from the start of extrusion by the extension operation of the extrusion jack 32 and the wheels are rotated to thereby reduce the starting resistance by the speed reducer. , 28 is compensated by the driving force, the pushing jack 32 only has to bear the running resistance after activation. Accordingly, the feeding of the bridge girder 102 can be continued smoothly by the push-out jack 32, and further, it is not necessary to consider the resistance load of the speed reducer, so that it is not necessary to enlarge the push-out jack 32 and the clamp means 33.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, A various change is possible in the range which does not deviate from the meaning.

It is the figure which showed one Embodiment of the delivery control system for performing delivery of a bridge girder. It is the figure which showed the outline of the delivery trolley at the time of delivery carrying a bridge girder, and is the figure which showed the state which connected the extrusion jack. It is the figure which showed the operation | movement timing at the time of a driving | operation being switched to delivery by an extrusion jack. It is the figure shown about the delivery method of the bridge girder performed in the field crossing a track. It is the side view which showed the outline of the delivery trolley at the time of delivery carrying a bridge girder. It is the front view which showed the outline of the delivery trolley at the time of delivery carrying a bridge girder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive pump 2 Control computer 3 Master computer 10,20 Sending cart 11,21 Traveling part 12,22 Vertical jack 18,28 Electric motor 32 Extrusion jack 33 Clamp means 33a Clamp cylinder 38 Cart traveling control device 102 Bridge girder 120 Temporary equipment 130 Traveling rail 140 Handrail

Claims (4)

A bridge girder with a handrail connected to the tip is placed on and supported by a plurality of delivery carts arranged in the front-rear direction, and the bridge girder is sent from one pier to the other pier by moving along the traveling rail of the delivery cart. In the delivery method of bridge girder constructed by
Until the handrail reaches the delivery destination pier, it is allowed to self-propelled by rotation of a wheel by a drive motor mounted on the delivery carriage, and after the handrail reaches the destination pier. Is a bridge girder delivery method characterized in that the delivery carriage is pushed out and moved by an extrusion jack, and the drive motor is driven for a predetermined time when the extrusion is started by the extrusion jack. In the bridge girder delivery method according to claim 1,
The extruded jack has clamping means capable of gripping the traveling rail, and the feeding carriage is pushed out by repeating the gripping and releasing of the traveling rail by the clamping means and the expansion and contraction by the extruded jack. Characteristic bridge girder delivery method. A bridge girder with a handrail connected to the tip is placed on and supported by a plurality of delivery carts arranged in the front-rear direction, and the bridge girder is sent from one pier to the other pier by moving along the traveling rail of the delivery cart. In the transmission control system of the bridge girder constructed by
The delivery cart is a self-propelled type in which wheels are rotated by a drive motor, and an extrusion jack is connected to one or two or more delivery carts, and the drive motor is driven and the extension of the extrusion jack is extended. A control device that controls the delivery carriage until the delivery machine reaches the delivery destination pier, by causing the delivery carriage to self-run by rotation of the wheels by the drive motor, and After the delivery pier reaches the delivery destination pier, the delivery carriage is pushed and moved by an extrusion jack, the delivery carriage is pushed out by the extrusion jack, and when the extrusion jack is started, A bridge girder delivery control system characterized in that the drive motor is driven for a certain period of time. In the bridge girder delivery control system according to claim 3,
The push-out jack has clamping means capable of gripping the traveling rail, and the control device sends out by controlling gripping and release of the traveling rail by the clamping means and expansion / contraction of the push-out jack. A bridge girder delivery control system characterized by extruding a cart.

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