JP3913615B2 - Construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method, and is particularly suitable for application to a construction method in which a delivery mechanism and a traction mechanism are used in combination.
[0002]
[Prior art]
Conventionally, when constructing a viaduct, for example, the bridge girder, which is a structure, is sequentially connected on the construction girder and the bridge girder is connected to the pier using a rear carriage as a sending mechanism or a towing device as a towing mechanism. It was sent out and construction was done.
[0003]
[Problems to be solved by the invention]
However, since the objects to be constructed (for example, viaducts) have become larger in recent years, the following problems are encountered when sending a bridge girder, etc. that is heavy and has a long feeding length with only a rear carriage or a towing device. was there.
[0004]
Since the rear carriage does not have a guide function in the direction of sending out the bridge girder (hereinafter referred to as the propulsion direction), it is difficult to send out the bridge girder stably when the delivery length of the bridge girder is long. .
[0005]
Further, the towing apparatus has a problem that the larger the weight of the bridge girder to be sent out, the larger the apparatus itself becomes, and it is necessary to reinforce existing structures such as bridge piers on a large scale.
[0006]
As one method for solving the above-mentioned problems, although a construction method for sending out a bridge girder using a rear carriage and a towing device has been proposed, the force for sending out the bridge girder of the rear carriage (hereinafter referred to as propulsive force). Is larger than the propulsive force of the towing device, so that a guide member (for example, a wire or cable) provided between the structure used in the towing device and the bridge girder serving as the destination of the destination is used. ) Is easy to sag, and there is still an insufficient problem that the work becomes complicated by the process of correcting this sag.
[0007]
The present invention has been made in view of the above-described problems, and is a construction method that can significantly improve work efficiency, perform stable feeding, and can minimize reinforcement of existing structures. It aims to be realized.
[0008]
[Means for Solving the Problems]
In order to solve this problem, the present invention employs the following means.
The construction method according to claim 1 is a construction in which a structure is sent out by using a rear carriage that repeatedly pushes and removes a rail alternately with a plurality of attaching and detaching members, a feeding device provided on each bridge pier, and a towing device. In the method, the reaction force is automatically adjusted so that the reaction force calculated by the hydraulic pressure of each of the rear carriage and each pump unit that drives each device is within a control value having an upper limit and a lower limit value determined based on the design reaction force. It is characterized by management .
[0009]
According to the construction method described above, the tension of the guide member used in the traction mechanism is detected, and the structure is sent out by the traction mechanism and the delivery mechanism while maintaining this tension in a predetermined state. The construction work can be simplified by preventing the sagging and omitting the process of correcting the sagging. In addition, since the structure is sent out using both the delivery mechanism and the traction mechanism, the weight of the structure can be shared between the delivery mechanism and the traction mechanism.
[0010]
Moreover, the reaction force is the invention described in claim 2, the rear bogie according to claim 1, the automatic management of the reaction force of the pump units for driving the delivery device and traction device, is calculated by the hydraulic pressure of the pump units Is within the control value, the reaction force is not corrected, and if it is not within the control value and within the control value having the upper limit and the lower limit, the reaction force is automatically corrected and the control value is further corrected. If not, each pump unit is emergency stopped to manually correct the reaction force, and the reaction force calculated by the hydraulic pressure of each pump unit is controlled to be within the control value .
[0011]
According to a third aspect of the present invention, the traction device according to the first or second aspect includes a hollow cylinder jack and a horizontal jack, and the guide member used for the traction device is the hollow cylinder jack. It is characterized by alternating with the horizontal jack. According to this construction method, the towing mechanism guides the structure by guiding the guide member alternately by hollow cylinder jacks and horizontal jacks, thereby guiding the structure accurately. Can be sent out in the direction.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a schematic overall configuration diagram showing an embodiment of a construction method according to the present invention. In FIG. 1, reference numeral 1 denotes a bridge girder which is a structure, and after being sequentially joined together on a construction girder 2, a bridge pier which is an existing structure by a rear carriage 3 which is a delivery mechanism and a traction device 4 which is a traction mechanism. P1, P2, P3, P4, P5, P6, P7... Are sequentially sent out in the propulsion direction.
[0014]
Further, a delivery device 5 is provided on each pier P1 to P7 so as to supplement the propulsive force of the bridge girder 1 delivered by the rear carriage 3 and the towing device 4.
[0015]
In practice, the towing device 4 has a hollow cylinder jack 4a and a horizontal jack 4b. And the wire W as a guide member stretched between the bridge girder 1 and, for example, the bridge pier P7 as a destination for sending out the bridge girder 1 is alternately wound by the hollow cylinder jack 4a and the horizontal jack 4b. ing. Thereby, since the towing apparatus 4 is guided by the wire W and guides the bridge girder 1, the bridge girder 1 can be sent out in an accurate direction.
[0016]
In the present embodiment, the case where the wire W is used as the guide member will be described, but the present invention is not limited thereto, and for example, a cable may be used as the guide member. Needless to say, various other things can be widely applied as long as they are provided between the bridge girder and the destination.
[0017]
Further, as shown in FIGS. 2A to 2C, the rear carriage 3 includes a base 30, a front jack 31A and a rear jack 31B that can be expanded and contracted in the traveling direction, and a movable front jack that can be clamped. 32A, rear jack 32B, etc. are provided. Then, the bridge girder 1 (not shown) to be sent is loaded on the base 30 and the front jack 31A and the rear jack 31B are contracted. First, as shown in FIG. The rear jack 32B is clamped with respect to the rail 33 while being in the open state.
[0018]
Next, as shown in FIG. 2 (b), after extending the front jack 31A and the rear jack 31B, as shown in FIG. 2 (c), the front jack 32A is clamped with respect to the rail 33, and The rear jack 32B is opened, and the front jack 31A and the rear jack 31B are contracted.
[0019]
In this way, the rear carriage 3 can propel the bridge girder 1 (not shown) loaded on the base 30 in the traveling direction indicated by the arrow in the figure. At this time, the rear carriage 3 is moved along with the propulsion of the bridge girder 1 by the front jack 32A and the rear jack 32B, so that the bridge girder 1 is sent out. It is possible to smoothly and continuously propel the bridge girder 1 without the need to move it.
[0020]
The rear carriage 3, the traction device 4 and the delivery device 5 are driven by the corresponding rear carriage pump unit 3A, the traction device pump unit 4A and the delivery device pump unit 5A provided in the vicinity thereof. The pump units 3A, 4A, and 5A are controlled by the control system unit 6 via the local unit 7, respectively.
[0021]
As shown in FIG. 3 to be described later, the control system unit 6 includes a hydraulic system central control unit 6A as a reaction force management system and a structure analysis unit 6B as a reaction force measurement system, and each pump unit 3A, 4A. Control value to be defined by comparing the reaction force of the rear carriage 3, the towing device 4 and the delivery device 5 given from 5A through the local unit 7 with a preset design reaction force as an ideal analysis value It is managed to be within the range.
[0022]
In addition, the control system unit 6 measures a measurement result obtained by, for example, measuring the distance measuring device 8A provided at the rear end portion of the bridge girder 1 by reflecting a laser beam or the like on the reflection amount measuring plate 8B installed on the pier P1. Is obtained via the local unit 7 to monitor the delivery amount of the bridge girder 1 delivered by the rear carriage 3 and the towing device 4.
[0023]
As shown in FIG. 3, the hydraulic system central control unit 6A has personal computers 60A1, 60A2,... 60An (hereinafter referred to simply as “instructions”) for giving instructions to the pump units 3A, 4A, 5A via the local unit 7. Personal computers 60A1, 60A2,... 60An) and personal computers 61A1, 61A2,... The structural analysis unit 6B has personal computers 6B1, 6B2,... 6Bn.
[0024]
The hydraulic system central control unit 6A constantly compares the reaction force applied from the pump units 3A, 4A, and 5A via the local unit 7 with the design reaction force composed of ideal analysis values by the personal computers 61A1 to 61An. Set the management value range. Further, the hydraulic system central control unit 6A monitors the feed amount of the bridge girder 1 and the like given from the distance measuring device 8A via the local unit 7.
[0025]
Moreover, the hydraulic system central control unit 6A compares the control reaction range with the design reaction force out of the reaction forces given from the pump units 3A, 4A, and 5A (in this embodiment, for example, the design reaction force is used as a reference). When there is a reaction force that is outside the control range (± 5 [%] is the controllable range and ± 20 [%] is the controllable range), the personal units 60A1 to 60An are connected to the corresponding pump units 3A, 4A, and 5A. 7, a control signal for instructing correction of the height of the delivery device 5 and the propulsive force of the rear carriage 3 and the towing device 4 is sent, and this reaction force is automatically adjusted.
[0026]
However, when there is a reaction force that exceeds the controllable range among the reaction forces applied from the pump units 3A, 4A, and 5A, the rear carriage 3 and the towing device 4 are used by the personal computers 60A1 to 60An, as will be described in detail later. A control signal for instructing the emergency stop to the pump units 3A, 4A is provided via the corresponding local unit 7, and a manual correction operation is performed.
[0027]
The structure analysis unit 6B compares and analyzes the reaction force given from the pump units 3A, 4A, and 5A via the local unit 7 by the personal computers 6B1 to 6Bn, and analyzes the results. The situation and tendency are grasped, and the situation which changes every moment is made. The analysis result is used to analyze the optimum value for correcting the reaction force, particularly during the manual control by the emergency stop described above.
[0028]
In practice, the reaction force of each pump unit 3A, 4A, 5A is corrected by executing the reaction force correction processing procedure RT1 shown in FIG. 4 by the personal computers 60A1-60An of the hydraulic system central control unit 6A. Is called. That is, the personal computers 60A1 to 60An of the hydraulic system central control unit 6A perform the reaction force correction processing procedure RT1 shown in FIG. 4 when a reaction force is applied from each pump unit 3A, 4A, 5A via the corresponding local unit 7. Starting from step SP1, in the subsequent step SP2, it is determined whether or not the reaction force applied from each pump unit 3A, 4A, 5A is within the limit value of the manageable range (hereinafter referred to as the control limit value). To do.
[0029]
If an affirmative result is obtained in this step SP2, the personal computers 60A1 to 60An proceed to the next step SP3 to continue the automatic delivery without correcting the reaction force, and then return to step SP2 and again each pump. Wait until reaction force is applied from the units 3A, 4A, 5A.
[0030]
On the other hand, if a negative result is obtained in step SP2, the personal computers 60A1 to 60An proceed to step SP4, in which the reaction force given from each of the pump units 3A, 4A, and 5A is the limit value of the controllable range (hereinafter referred to as this). Is referred to as a control limit value).
[0031]
If an affirmative result is obtained in step SP4, the personal computers 60A1 to 60An proceed to step SP5 to continue the automatic feed while automatically correcting the reaction force, and then return to step SP2 and again each pump unit. Wait until reaction force is applied from 3A, 4A, 5A. The correction of the reaction force in step SP5 is a simple correction that does not cooperate with the personal computers 6B1 to 6Bn of the structure analysis unit 6B.
[0032]
On the other hand, if a negative result is obtained in step SP4, the personal computers 60A1 to 60An proceed to step SP6 to automatically stop each pump unit 3A, 4A, and 5A and allow the operator to manually correct the reaction force. Then, after switching the operation mode of each pump unit 3A, 4A, 5A and completing the manual correction by the operator, the process returns to step SP2 and waits until reaction force is again applied from each pump unit 3A, 4A, 5A. The correction of the reaction force in step SP6 is an advanced correction in cooperation with the personal computers 6B1 to 6Bn of the structure analysis unit 6B.
[0033]
That is, the operator manually corrects the reaction force based on the optimum correction value in the current situation obtained as a result of analysis by the personal computers 6B1 to 6Bn of the structural analysis unit 6B. 4A and 5A are performed.
[0034]
In this manner, the personal computers 60A1 to 60An of the hydraulic system central control unit 6A repeat the routine of step SP1-SP2-SP3, step SP1-SP2-SP4-SP5 or step SP1-SP2-SP4-SP6, When the reaction force of the pump units 3A, 4A, 5A is within the control limit value, it is not corrected. When the reaction force is within the control limit value, the correction is automatically made. In the case of exceeding, each pump unit 3A, 4A, 5A is emergency stopped and corrected manually, so that the reaction force of each pump unit 3A, 4A, 5A becomes a value within the specified control value range. Manage automatically.
[0035]
Thereby, since the system control is performed so that the reaction force of each pump unit 3A, 4A, 5A becomes a value within the management value range, the propulsion operation of the rear carriage 3 and the towing device 4 can be synchronized. It is possible to keep the rear carriage 3 and the traction device 4 in an optimal feeding state with respect to the bridge girder 1 and to easily prevent the wire W of the traction device 4 from sagging. And since the work of correcting the slack of the wire W can be omitted, the working efficiency is remarkably improved, and the traveling direction of the bridge girder 1 is guided while maintaining the tension of the wire W in a predetermined state. Bridge girder 1 can be sent out stably.
[0036]
Further, since the rear carriage 3 and the towing device 4 are used in combination, reinforcement of the piers P1 to P7, which are existing structures, can be minimized, and the cost can be reduced.
[0037]
Further, according to this construction method, the rear carriage 3 and the traction device 4 are controlled by the hydraulic system central control unit 6A and the structure analysis unit 6B, so that the state of the rear trolley 3 and the traction device 4 can be grasped. Since the structure is propelled, it is possible to keep the delivery state of the bridge girder 1 in the rear carriage 3 and the towing device 4 in an optimum state.
[0038]
Furthermore, according to this construction method, the hydraulic system central control unit 6A preliminarily sets a predetermined value for each reaction force, and continuously measures the measured values of each reaction force and ideal analysis values for these reaction forces. Since the reaction force is automatically adjusted so that each reaction force is within the specified value, the reaction force of the rear carriage 3 and the reaction force of the traction device 4 are within the specified value. The propulsion operation of the device 4 can be synchronized, and the wire W of the traction device 4 can be easily prevented from sagging.
[0039]
In the above-described embodiment, the prescribed value of the reaction force given from each pump unit 3A, 4A, 5A is ± 5 [%] based on the design reaction force, and the control range is ± 20 [%]. However, the present invention is not limited to this. In short, if the structure can be sent out stably, various other numerical values can be used as the prescribed values. . At this time, an advantage that the reaction force can be corrected more accurately can be obtained by setting the prescribed value in two stages as in the present embodiment.
[0040]
【The invention's effect】
As described above, according to the present invention, in the construction method, the tension of the guide member used for the traction mechanism is detected, and the structure is sent out by the traction mechanism and the delivery mechanism while maintaining the tension in a predetermined state. As a result, sagging of the guide member can be prevented in advance, and the construction work can be simplified as much as the process of correcting this sagging is omitted, thus greatly improving work efficiency and performing stable feeding. The construction method to obtain can be realized. In addition to this, this construction method can minimize the reinforcement of the sending mechanism and the existing structure where the towing mechanism is installed, because the propulsive force for sending the structure can be shared between the sending mechanism and the towing mechanism. it can.
[0041]
Moreover, according to this construction method, the towing mechanism guides the structure by being guided by the guide member by alternately pulling the guide member by the hollow cylinder jack and the horizontal jack. Can be sent in the correct direction.
[0042]
In addition, according to this construction method, since the delivery mechanism is a rear carriage that is propelled while sandwiching the rail, the structure is fed out while moving along with the propulsion of the structure. Thus, it is possible to smoothly and continuously propel the structure without having to move the installation position of the rear carriage.
[Brief description of the drawings]
FIG. 1 is a schematic overall configuration diagram showing an embodiment according to a construction method of the present invention.
FIG. 2 is a schematic configuration diagram for explaining a traveling operation in a rear carriage.
FIG. 3 is an overall configuration diagram of a control system unit.
FIG. 4 is a flowchart showing a reaction force correction processing procedure.
[Explanation of symbols]
1 Bridge girder (structure)
3 Rear carriage (sending mechanism)
31A Front jack 31B Rear jack 32A Front jack 32B Rear jack 4 Towing device (towing mechanism)
4a Hollow cylinder jack 4b Horizontal jack W Wire (guide member)
5 Sending device 6 Control system unit 6A Hydraulic system central control unit 6B Structure analysis unit

Claims (3)

In the construction method of sending out the structure by using the rear carriage that repeatedly pushes and removes the rail alternately with a plurality of detachable members, the feeding device provided on the upper part of each pier, and the towing device ,
The reaction force is automatically managed so that the reaction force calculated by the hydraulic pressure of each of the rear carriage and each pump unit that drives each device is within a control value having an upper limit and a lower limit value determined based on the design reaction force. A construction method characterized by Automatic management of reaction force of each pump unit that drives the rear carriage, the delivery device, and the towing device according to claim 1 .
If the reaction force calculated by the hydraulic pressure of each pump unit is within the above control value, without correcting the reaction force,
In addition, when it is not within the control value and within the control value having the upper limit and the lower limit value, the reaction force is automatically corrected,
If it is not within the control value, emergency stop each pump unit to manually correct the reaction force.
A construction method characterized by controlling the reaction force calculated by the hydraulic pressure of each pump unit to be within the control value . The towing device according to claim 1 or 2 comprises a hollow cylinder jack and a horizontal jack,
A construction method characterized in that guide members used in the traction device are alternately wound by the hollow cylinder jack and the horizontal jack.

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