JP2011069168A - Bridge girder delivery method and bridge girder slide erection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bridge girder delivery method attaining the erection of a bridge girder only by assembling required minimum bents, and to provide a bridge girder slide erection method. <P>SOLUTION: The bridge girder delivery method includes installing a construction girder 11 at the end of a bridge girder member 1; carrying out a bridge girder lowering step in the installed state of a construction tower 12 on the bridge girder member 1, in a position corresponding to a lowering bent B for lowering the bridge girder member and also in the installed state of a first oblique suspension wire 13 for connecting the construction tower 12 to the construction girder 11, and a second oblique suspension wire 14 for connecting the construction tower 12 to an intermediate part of the bridge girder member 1; and removing the construction girder 11, the construction tower 12, the first oblique suspension wire 13 and the second oblique suspension wire 14 after the termination of the bridge girder lowering step. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  According to the present invention, by running a delivery carriage on which a bridge girder member is placed, the bridge girder delivery method for bridging from the first pier to the second pier, and the horizontal placing stage on which the bridge girder member is placed are moved in the lateral direction. Thus, the present invention relates to a bridge girder horizontal construction method that bridges the bridge girder member from the first pier to the second pier.

When building a bridge on a railway track or on an expressway, a ground yard is installed on the rear extension line of the construction point, a bridge girder member is assembled on the ground yard, and the assembled bridge girder member is placed on the ground yard. A bridge girder delivery method is carried out in which a bridge girder member is sent from a first pier to a second pier, and is placed on a delivery carriage movable on a track installed in the road.
The delivered bridge girder member is lowered and installed on the first pier and the second pier by a descent device installed on the descent vent.
When the bridge girder is long, the bridge girder is supported at both ends by the first pier and the second pier, and is also supported by, for example, the third pier and the fourth pier at an intermediate point.
And, when the bridge girder member supported by the four bridge piers is lowered by the descent device for shortening the descent time, naturally, the descent vent is assembled near the pier and the four descent devices are installed. It will be used to lower the bridge girder member. That is, as many descending vents as the number of piers are required.

On the other hand, as a method of erection of the bridge girder member, there is a method of assembling a horizontal vent on the side of the pier to be installed, assembling the bridge girder member on the horizontal vent, and laterally moving the assembled bridge girder member with a horizontal device. .
Even at this time, in the case of the bridge girder member supported by the four piers, it is necessary to install four pre-emption devices on the four piers.

On the other hand, Patent Document 1 discloses that in a construction method in which a steel-concrete composite girder is pretending to move from a garter to a bridge pier, using a wire, the post of the pretending device is maintained in an upright state.
Further, Patent Document 2 describes a method of rotating a bridge girder member by connecting a wire from a steel tower arranged on the center of rotation to a bridge girder member and suspending it obliquely with the wire in the construction work of the bridge. Yes.

JP 2007-284931 A JP 2005-090108 A

However, the conventional technique has the following problems.
(1) With the conventional delivery / descent method, for example, when trying to install a bridge over the intersection in front of the station, the location of the third and fourth piers, which are the piers at the intermediate point, must be secured. Even if it can be constructed, it may be difficult to secure a place to assemble the descending vent. In addition, when descending on the pier, there is a problem that it can be lowered little by little due to the combination of the sandle and the vertical jack, and the descent work takes time. For example, when it takes 20 hours for the descent, it is necessary to block traffic for 4 hours at night for 5 days, which causes trouble for the economy and society.

(2) Moreover, in the conventional pre-emption method, four sets of pre-installation facilities must be assembled. For example, when installing bridges in the sky in front of an intersection in front of a station, installing a horizontal installation on the third pier or the fourth pier, which is the pier at the intermediate point, does not secure the crane installation location. There was a problem that was difficult.
On the other hand, although the technique of patent document 1 uses a wire like this invention, the purpose of using a wire is for keeping the support | pillar part of a preemption apparatus in an upright state.
Moreover, although the technique of patent document 2 uses a wire like this invention, the bridge girder member is bridged by a rotating means, and does not use a descent method or a horizontal method. This is different from the present invention.

  An object of the present invention is to provide a bridge girder delivery method and a bridge girder horizontal construction method that can solve the above-mentioned problems and can construct a bridge girder only by assembling a necessary minimum descent vent and a horizontal installation facility. .

The bridge girder delivery method and the bridge girder horizontal construction method according to the present invention have the following configurations.
(1) In the bridge girder delivery method that runs from the first pier to the second pier by running the delivery carriage on which the bridge girder is placed, a construction girder is installed at the end of the bridge girder member; On the bridge girder member, a construction tower is installed at a position corresponding to a lowering vent for lowering the bridge girder member. The first slanting wire connecting the construction tower and the construction girder, and the intermediate point between the construction tower and the bridge girder member The bridge girder descent process is performed in the state where the second slant hanging wire is connected, and after completion of the bridge girder descent process, the construction girder, the construction tower, the first slant hanging wire, and the second slant hanging wire are removed. It is characterized by.
(2) In the bridge girder delivery method described in (1), construction girders are installed at both ends of the bridge girder member, and descent vents are installed at both ends of the bridge girder member, corresponding to each descent vent A construction tower is installed at a position where the first oblique suspension wire and the second oblique suspension wire are installed in each construction tower.
(3) In the bridge girder delivery method described in (2), without using the descent vent and the descent device for the girder member, the sanddle and the vertical jack are placed on the first pier and the second pier. It is characterized by construction in combination.

(4) A construction girder is installed at the end of the bridge girder member in the bridge girder horizontal construction method that moves from the first pier to the second pier by moving the horizontal mounting table on which the bridge girder member is placed. In addition, a construction tower is installed on the bridge girder member at a position corresponding to a pre-installation facility for crossing the bridge girder member, the first slanting wire connecting the construction tower and the construction girder, and the middle of the construction tower and the bridge girder member Carrying out a pre-emption process in the state where the second slanting wire connecting the points is installed, removing the construction girder, the construction tower, the first slanting wire, and the second slanting wire after the precession process, It is characterized by.
(5) In the bridge girder horizontal construction method described in (4), the construction girder is installed at both ends of the bridge girder member, and the horizontal installation equipment is installed at both ends of the bridge girder member, at the position corresponding to each horizontal installation facility. A construction tower is installed, and each construction tower is provided with a first oblique suspension wire and a second oblique suspension wire.

Next, the operation and effects of the bridge girder delivery method and the bridge girder horizontal construction method having the above-described configuration will be described.
(1) In the bridge girder delivery method that runs from the first pier to the second pier by running the delivery carriage on which the bridge girder is placed, a construction girder is installed at the end of the bridge girder member; On the bridge girder member, a construction tower is installed at a position corresponding to a lowering vent for lowering the bridge girder member. The first slanting wire connecting the construction tower and the construction girder, and the intermediate point between the construction tower and the bridge girder member The girder descent process is performed in the state where the second slanting wire is connected, and after completion of the girder descent process, the construction girder, the construction tower, the first slanting wire, and the second slanting wire are removed. Because the load and moment at the intermediate point of the bridge girder member can be supported by the wire, for example, when a bridge is to be installed above the station square intersection, the third pier, which is the pier at the intermediate point, Assemble the descent equipment on the 4th pier The bridge girder member is lowered by only two lowering vents near the first pier and the second pier, and placed on the first pier, the second pier, the third pier, and the fourth pier. Can do.
At this time, since the first descending vent assembled near the first pier and the second descending vent assembled near the second pier can be made large, a large jack can be used for descending, and the working time can be up to about 30 minutes. It can be shortened.

(2) In addition, in the bridge girder delivery method described in (1), the construction girder is installed at both ends of the bridge girder member, and the descent vents are installed at both ends of the bridge girder member. The construction towers are installed at positions corresponding to the above, and each construction tower is provided with the first slanting wire and the second slanting wire, so compared with the case where it is carried out only on one side, The number of descent equipment can be reduced.
(3) Also, in the bridge girder delivery method described in (2), the bridge girder member is not used with a descent vent and descent device, but on the first pier and the second pier, with a combination of sandals and vertical jacks. Since it is characterized by construction, work to lower the bridge girder member without assembling the descent vent and descent device by assembling the sand pier and vertical jack on the first and second piers. Time can be shortened.

(4) A construction girder is installed at the end of the bridge girder member in the bridge girder horizontal construction method, in which the horizontal girder mounting table on which the girder member is placed is moved in the horizontal direction from the first pier to the second pier. In addition, a construction tower is installed on the bridge girder member at a position corresponding to a pre-installation facility for crossing the bridge girder member, a first slanting wire connecting the construction tower and the construction girder, and the middle of the construction tower and the bridge girder member Carrying out a pre-emption process in the state where the second slanting wire connecting the points is installed, removing the construction girder, the construction tower, the first slanting wire, and the second slanting wire after the precession process, Because it can support the load and moment at the intermediate point of the bridge girder member with wires, for example, when installing a bridge over the station square intersection, etc., the third pier or the third pier that is the pier at the intermediate point 4 Take on the bridge pier Even if the equipment is not assembled, the bridge girder members can be intercepted by only two side vents near the first pier and the second pier, and mounted on the first pier, the second pier, the third pier, and the fourth pier. Can be placed.

(5) In addition, in the bridge girder horizontal construction method described in (4), the construction girder is installed at both ends of the bridge girder member, and the horizontal installation equipment is installed at both ends of the bridge girder member, corresponding to each of the horizontal installation equipment. Since construction towers are installed at each position, and each construction tower is equipped with a first slanting wire and a second slanting wire, compared to the case where it is carried out only on one side, The number can be reduced.

It is a figure which shows the structure of the apparatus used with the delivery method. It is a figure which shows the state after sending out the bridge girder member 1 in the delivery method. It is a side view which shows the state in the preparatory process of the bridge girder member 1 in a sending-out construction method. In the delivery method, it is a side view showing a state before the bridge girder member 1 is lowered. In a delivery method, it is a side view which shows the state after the bridge girder member 1 was dropped. It is an enlarged view of a construction tower and a slanting wire. It is a X direction view in FIG. 6 of a construction tower. It is an enlarged view of the head of a construction tower. It is an enlarged view of a connection part. It is sectional drawing of a connection part. It is an enlarged view of the drawing-in facility. It is a side view which shows the state before the bridge girder member 1 is intercepted in a horizontal construction method. It is a top view which shows a pre-emption process. In a horizontal construction method, it is a side view in which the bridge beam member 1 shows the state in a preparation process. It is a figure which shows the state after the bridge girder member 1 carries out a horizontal fall in the horizontal construction method.

A bridge girder delivery method according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the configuration of an apparatus used in the delivery method. FIG. 1 shows a state before the bridge girder member 1 is sent out.
As shown in FIG. 1, the pier K1 (corresponding to the second pier of claim 1), K2, K3 and K4 (corresponding to the first pier of claim 1) are arranged from the left side. Yes. In the vicinity of the right side of the pier K1, a descending vent B1 that is a temporary assembly leg and is removed after completion is assembled. Similarly, a lowering vent B2 is assembled in the vicinity of the left side of the pier K4. The descending vent B includes a large vent 31, a descending jack 32 and a delivery device 33. A large vent 31 is assembled on the ground, a large stroke lowering jack 32 is provided on the upper portion of the large vent 31, and the bridge girder member 1 mounted on the lowering jack 32 is movable. 33 is provided. The height of the descending vent B can be adjusted by adjusting the height of the descending jack 32. At the upper part of the pier K2 and the pier K3, a feeding device 33 is provided.
Further, in the vicinity of the right side of the pier K4, a plurality of support vents B3 to B9 are assembled at substantially equal intervals from the left. The upper surfaces of the support vents B3 to B9 have the same height, and the linear track 2 is placed on the upper surface of the support vents B3 to B9 in a horizontal state and supported by the support vents B3 to B9. A self-propelled front carriage 21 and two rear carriages 22 are movably installed on the linear track 2. The front carriage 21 and the two rear carriages 22 correspond to the delivery carriage of claim 1.
The bridge girder member 1 is placed on the front carriage 21 and the rear carriage 22. The front of the bridge girder member 1 is supported by the front carriage 21, and the center portion and the rear end portion are supported by the two rear carriages 22.
A spreader 16 is connected to the front side of the bridge girder member 1. The hand extender 16 is supported by the descending vent B2.

Next, a bridge girder delivery method according to an embodiment of the present invention will be described.
[Sending process]
As shown in FIG. 1, before being sent out, the bridge girder member 1 includes a feeding device 33 provided on the descending vent B <b> 2, a front carriage 21 provided on the linear track 2, and two vehicles. The rear carriage 22 is supported. FIG. 2 shows a state after the bridge girder member 1 is sent out. When the bridge girder member 1 is delivered, the front carriage 21 and the rear carriage 22 travel to the left along the straight track 2 so that the bridge girder member 1 is delivered between the bridge pier K1 and the bridge pier K4.
Since the front carriage 21 has a drive mechanism, the front carriage 21 travels along the linear track 2. The bridge girder member 1 is conveyed by the self-propelled carriage 21. Since the two rear carriages 22 do not have a drive mechanism and cannot self-propell, they receive the weight of the bridge girder member 1 and travel according to the movement of the bridge girder member 1.

As the front carriage 21 travels to the tip of the linear track 2, the bridge girder member 1 is sent out in the vicinity of the descending vent B2. Thereby, the hand extender 16 attached in front of the bridge girder member 1 reaches the pier K3. The feeding device 33 provided on the upper part of the pier K3 abuts on the lower surface of the hand extender 16 to support the hand extender 16. The center and rear end of the bridge girder member 1 are supported by two rear carriages 22. Since the bridge girder member 1 is supported at three locations of the feeding device 33 and the two rear carriages 22 above the descending vent B2, there is no problem even if the support by the front carriage 21 is removed. Accordingly, the front carriage 21 lowers the jack, removes it from the lower surface of the bridge girder member 1, returns by about 10 m by the drive mechanism, raises the jack again, and supports the lower surface of the bridge girder member 1.
The delivery device 33 on the descending vent B2 and the front carriage 21 and the two rear carriages 22 deliver about 10 m.

Similarly, the bridge girder member 1 is fed over the bridge pier K3 from the bridge pier K1 by the pier K3 feed device 33, the pier K2 feed device 33, the pier K1 feed device 33, the front carriage 21 and the two rear carriages 22. To send. At this time, the rear carriage 22 that is no longer needed is sequentially removed.
After the bridge girder member 1 is properly disposed between the bridge pier K1 and the bridge pier K4, the leading end portion of the paper spreader 16 is removed.

  As shown in FIG. 2, after the delivery process is completed, the bridge girder member 1 includes a delivery device 33 provided on the lowering vent B1, a delivery device 33 provided on the upper portion of the pier K2, It is supported by a delivery device 33 provided on the upper part of the pier K3 and a delivery device 33 provided on the descending vent B2. The bridge girder member 1 has a space between the pier K1 and the pier K4.

After the bridge girder member 1 is sent to the sky between the bridge pier K1 and the pier K4, it is disposed from the pier K1 to the bridge pier K4, so that a descent process for lowering the bridge girder member 1 is required.
As shown in FIG. 2, since the intermediate part of the bridge girder member 1 is supported by the feeding device 33 provided on the upper part of the bridge pier K2 and the bridge pier K3, the lowering jack 32 included in the lowering vents B1 and B2 is provided. Therefore, in order to lower the bridge girder member 1 from the pier K1 to the pier K4, the sander and the feeding device 33 provided at the upper part of the pier K2 and the pier K3 must be removed, and the support at the intermediate portion of the bridge girder member 1 must be removed. I must.
However, since the bridge girder member 1 is long and heavy, if the support at the middle part of the bridge girder member 1 is eliminated, the bridge girder member 1 is supported only at both ends, so the bending moment at the middle part of the bridge girder member 1 is Very big. Therefore, when there is no support in the intermediate part and the bridge girder member 1 is lowered, the bridge girder member 1 buckles because the intermediate part of the bridge girder member 1 has a large bending moment.

[Preparation process]
Therefore, in the lowering process of lowering the bridge girder member 1, preparation is performed before the lowering process of lowering the bridge girder member 1 in order to prevent buckling in a portion having a large moment even if there is no support in the intermediate part of the bridge girder member 1. A process is required.
FIG. 3 is a side view showing a state in the preparation process of the bridge girder member 1 in the delivery method. First, the structure of each part in a preparation process is demonstrated, referring FIG.
As shown in FIG. 3, in the preparation process, construction girders 11 </ b> A and construction girders 11 </ b> B are respectively installed at both ends of the bridge girder member 1, and on the bridge girder member 1 at positions corresponding to the descending vents B <b> 1 and B <b> 2. The construction tower 12A and the construction tower 12B are respectively installed. The construction girder 11A and the top of the construction tower 12A are connected by a first diagonal suspension wire 13A, and the top of the construction tower 12A and the intermediate portion of the bridge girder member 1 are connected by a second diagonal suspension wire 14A. Similarly, on the opposite side of the bridge girder member 1, the work girder 11 </ b> B and the top of the work tower 12 </ b> B are connected by a first slanting wire 13 </ b> B, and the top of the work tower 12 </ b> B and the intermediate part of the bridge girder member 1 are second They are connected by the slanting wire 14B.

The construction girder 11 is installed by being connected to both ends of the bridge girder member 1. The construction girder 11 </ b> A is installed at the tip of the bridge girder member 1 from the beginning, and is provided as a part of the handbill 16. With such a configuration, after the feeding process is completed, not the entire spreader 16 is removed, but only the leading end portion of the spreader 16 is removed while leaving the construction beam 11A.
Moreover, about the rear end part of the bridge girder member 1, the construction girder 11B may be installed before the sending process or may be installed in the preparation process.

The construction tower 12 is installed on the bridge girder member 1 at a position directly above the descending vents B1 and B2.
FIG. 6 shows an enlarged view of the construction tower 12, the first oblique hanging wire 13, and the second oblique hanging wire 14. FIG. 7 shows a side view of the construction tower 12. FIG. 8 shows an enlarged view of the head of the construction tower 12.
As shown in FIG. 6, a reinforcing member 53 is attached to the bridge girder member 1 immediately above the descending vents B <b> 1 and B <b> 2, and the work tower 12 is rotatable with respect to the reinforcing member 53. It is supported by. As shown in FIG. 7, construction tower members 40 </ b> A and 40 </ b> B are erected on the pair of main girders 1 </ b> A and 1 </ b> B of the bridge girder member 1. The construction tower members 40 </ b> A and 40 </ b> B are connected and integrated by an upper connecting member 45. On the upper connecting member 45, a construction tower head bracket 41A is fixed corresponding to the construction tower member 40A, and a construction tower head bracket 41B is fixed corresponding to the construction tower member 40B. As shown in FIG. 8, one end portions of a pair of connecting plates 43 are rotatably supported by rotation shafts 42 on both sides of the construction tower head brackets 41 </ b> A and 41 </ b> B. A sheave 44 is rotatably supported at the other end of the connecting plate 43.
That is, two sets of connecting plates 43 and sheaves 44 are attached to both sides of the construction tower head bracket 41A. In addition, two sets of connecting plates 43 and sheaves 44 are attached to both sides of the construction tower head bracket 41B. The first oblique hanging wire 13 and the second oblique hanging wire 14 are wound around the sheave 44, respectively.

Thus, on one side of the bridge girder member 1, with the four first diagonal suspension wires 13 being folded back, a total of eight first diagonal suspension wires 13 are connected to the end of the construction tower 12 and the bridge girder member 1. Connected with a certain construction girder 11. In addition, in a state where the four second oblique hanging wires 14 are folded back, the construction tower 12 and the intermediate portion of the bridge girder member 1 are connected by a total of eight second oblique hanging wires 14.
Similarly, on the other side of the bridge girder member 1, with the four first slant hanging wires 13 being folded back, a total of eight first slant hanging wires 13 are connected to the end of the construction tower 12 and the bridge girder member 1. Connected with a certain construction girder 11. In addition, in a state where the four second oblique hanging wires 14 are folded back, the construction tower 12 and the intermediate portion of the bridge girder member 1 are connected by a total of eight second oblique hanging wires 14.

FIG. 9 shows the structure of the connecting portion 51 of the first oblique hanging wire 13 or the second oblique hanging wire 14 in the construction girder 11 or the bridge girder member 1. 10 is a cross-sectional view of FIG. The construction girder 11 is fixedly provided with a mountain-shaped connecting portion 51 for connecting the first slanting suspension wire 13 and the bridge girder member 1 to the second slanting suspension wire 14. A hole 51a for hooking the hooks of the first oblique wire 13 or the second oblique wire 14 is formed, and a thickened reinforcing portion 51b is provided around the hole 51a.
The first slanting wire 13 or the second slanting wire 14 includes a wire main body 61, a wire attachment member 62, and a retracting facility 63.
The retracting facility 63 includes a tension rod 81, a retracting nut 82, a hydraulic jack 83, and a load cell 84. One end of the tension rod 81 is formed with a male screw on the outer periphery, a pull-in nut 82 is screwed together, and the other end is hooked through the hook of the reinforcing member 51 in the construction girder 11 or the bridge girder member 1 and the middle part is a hydraulic jack. 83, the load cell 84, and the wire attachment member 62 adjacent to the retracting facility 63.

  Further, the ends of the pair of wire main bodies 61 wound around the sheave 44 are fixed to a wire attaching member 62 as shown in FIG. A load cell 84 and a hydraulic jack 83 are fixed to the wire attachment member 62. Since the tension rod 81 is a rod of the hydraulic jack 83, when the hydraulic pressure is supplied to the hydraulic jack 83 and the hydraulic jack 83 is driven, the tension rod 81 moves relative to the hydraulic jack 83.

Next, the operation and effect of each component in the preparation process will be described.
As shown in FIG. 3, the intermediate portion of the bridge girder member 1 is supported at two locations by a feeding device 33 at the top of the pier K2 and a feeding device 33 at the top of the pier K3. When the delivery device 33 at the upper part of the bridge pier K2 and the bridge pier K3 is removed, the support in the intermediate portion of the bridge girder member 1 is lost, and the moment in the intermediate portion of the bridge girder member 1 is very large, so that the intermediate portion buckles.
Therefore, before removing the feeding device 33 at the upper part of the bridge pier K2 and the bridge pier K3, the construction girders 11A and the construction girders 11B are respectively installed at both ends of the bridge girder member 1, and the descent vent is provided on the bridge girder member 1. A construction tower 12A and a construction tower 12B are installed at positions directly above B1 and B2, respectively. The construction girder 11A and the top of the construction tower 12A are connected by a first diagonal suspension wire 13A, and the top of the construction tower 12A and the intermediate point of the bridge girder member 1 are connected by a second diagonal suspension wire 14A. Similarly, on the opposite side of the bridge girder member 1, the work girder 11 </ b> B and the top of the work tower 12 </ b> B are connected by the first slanting suspension wire 13 </ b> B, and the top of the work tower 12 </ b> B and the intermediate point of the bridge girder member 1 are It is configured to be connected by a slanting wire 14B.

As shown in FIG. 3, the tension F of the second slanting wire 14 </ b> B is adjusted by the second slanting wire 14 </ b> B, and the vertical component force F <b> 1 in the vertical direction of the tension F is applied to the bridge girder 1. It is made equal to the supporting force T by the feeding device 33 at the upper part of K3. Therefore, even if the delivery device 33 at the upper part of the bridge pier K3 is removed, the intermediate part of the bridge girder member 1 receives the vertical component force F1 and does not apply a large moment. In addition, since the tension F of the second slanting wire 14B receives the horizontal component force F2 in the horizontal direction, the top of the work tower 12B may fall over. Therefore, the construction girder 11B is installed at the end of the bridge girder member 1, and the top of the construction girder 11B and the construction tower 12B is connected by the first diagonal suspension wire 13B, whereby the tension P of the first diagonal suspension wire 13B is increased. By adjusting, the horizontal component force P2 in the horizontal direction of the tension P is made equal to the magnitude of the horizontal component force F2 by the second slanting suspension wire 14B, and the direction is reversed with respect to the construction tower 12B. Accordingly, the left horizontal component force F2 received by the head of the construction tower 12B and the right horizontal component force P2 are balanced, and the construction tower 12B does not fall down.
Moreover, since the construction girder 11 receives a large force, a certain rigidity is required.

  Further, since the construction tower 12 receives the tension F of the second oblique suspension wire 14 and the tension P of the first oblique suspension wire 13, the bridge girder member 1 receives a large vertical component force from the root of the construction tower 12, The bridge girder member 1 may be bent. However, since the construction tower 12 is installed at a position corresponding to the descending vent B, the bridge girder member 1 is supported by the descending vent B from below and receives a supporting force. There is no fear of buckling.

In addition, a pull-in facility 63 is provided on the first oblique hanging wire 13 and the second oblique hanging wire 14. With the pull-in facility 63, the horizontal force due to the first and second slanting wires 13 and 14 can be adapted.
FIG. 11 shows the retracting facility 63. When hydraulic pressure is applied to the tension rod 81 from the inlet of the load cell 84 jack 83, the tension rod 81 moves backward with respect to the jack 83. That is, in FIG. 11, the tension rod 81 moves leftward with respect to the jack 83.
However, since the hook at the other end of the tension rod 81 is hooked on the reinforcing plate 51 fixed to the bridge girder member 1, the tension rod 81 cannot actually move, and the jack 83 moves backward with respect to the tension rod 81. . That is, in FIG. 11, the jack 83 moves to the right with respect to the tension rod 81.
When the jack 83 moves to the right with respect to the tension rod 81, a gap appears between the pull-in nut 82 squeezed by the tension rod 81 and the jack 83. At this time, by tightening the pull-in nut 82, the pull-in nut 82 advances toward the jack 83 and closes the gap between the pull-in nut 82 and the jack 83. Therefore, the jack 83, the load cell 84, and the wire attachment member 62 are fixed to the position moved to the right with respect to the tension rod 81, and the distance between the wire attachment member 62 and the hook becomes small.
Therefore, when the distance between the wire attachment member 62 and the hook is reduced, the second wire body 61 of the second oblique hanging wire 14 is pulled, and the tension F of the second oblique hanging wire 14 is increased. That is, by applying the hydraulic pressure, the tension F of the second oblique hanging wire 14 can be increased. Conversely, when the hydraulic pressure is decreased, the tension F of the second oblique hanging wire 14 can be decreased.

If the tension F of the second slanting wire 14 is too large, the wire body 61 or the construction tower 12 or the like must be strengthened, resulting in an increase in cost. On the other hand, if the tension F of the second slanting wire 14 is too small, the vertical component force F1 of the tension F cannot change the supporting force at the intermediate part of the bridge girder member 1 and buckles at the intermediate part of the bridge girder member 1. The effect which prevents can not be produced.
Therefore, the load cell 84 is provided in order to adapt the tension F of the second oblique hanging wire 14. The load cell 84 can measure and adjust the tension F of the second oblique hanging wire 14.

In addition, since both side portions of the construction tower head metal fitting 41 at the top of the construction tower 12 are rotatably connected to one end portions of the pair of connection plates 43 by the rotation shafts 42, respectively, the first slanting wire 13. Alternatively, when the connecting plate 43 rotates according to the angle at which the second oblique hanging wire 14 becomes the construction tower 12, the first oblique hanging wire 13 or the second oblique hanging wire 14 and the connecting plate 43 are It will be in a straight line in the pulling direction and no unnecessary force will be generated.
When the first slanting wire 13 or the second slanting wire 14 is formed of only one wire, a sufficient tensile force is required, and the wire must be thickened. Then, it takes time and labor to carry and install the wire. Further, a large force acts on the tension rod 81, jack 83, pull-in nut 82, load cell 84, and wire attachment member 62, making it impossible to deal with general-purpose machines, which is uneconomical. Therefore, the 1st slanting wire 13 or the 2nd slanting wire 14 is comprised by a some thin wire, can disperse | distribute a tensile force and can use a general purpose machine. In the present invention, each of the first slanting wire 13 and the second slanting wire 14 uses eight wires.

[Descent process]
After the preparation process is completed, there is no risk of buckling even if the intermediate portion of the bridge girder member 1 is pulled by the second slanting wire 14 and is not supported by the feeding device 33 above the piers K2 and K3. Therefore, the delivery device 33 at the upper part of the piers K2 and K3 is removed.
After removing the feeding device 33 at the upper part of the piers K2 and K3, the bridge girder member 1 is lowered by lowering the lowering jacks 32 of the lowering vents B1 and B2.
FIG. 5 is a side view showing a state after the bridge girder member 1 is lowered in the delivery method. Both ends of the bridge girder 1 are in contact with the piers K1 and K4, and the intermediate part is in contact with the piers K2 and K3, and the descent process is completed.
After the descent process is completed, the work girder 11, the work tower 12, the first slanting wire 13, and the second slanting wire 14 are removed.

As explained in detail above, according to the bridge girder delivery method of the present embodiment, the construction girder 11 is installed at the end of the bridge girder member 1, and the bridge girder member is lowered on the bridge girder member 1. The construction tower 12 is installed immediately above the descending vent B, and the first slanting wire 13 that connects the construction tower 12 and the construction girder 11 and the second that connects the construction tower 12 and the intermediate portion of the bridge girder member 1 are installed. Performing the bridge girder descent process with the slanting wire 14 installed, and removing the construction girder 11, the work tower 12, the first slanting hanger wire 13, and the second slanting hanger wire 14 after the bridge girder descent process is completed. Therefore, when the bridge girder member 1 is lowered by the reduction of the descent jack 32 of the descent vent B, the load and moment at the intermediate portion of the bridge girder member 1 are changed to the first inclined wire 13 and the second The bridge girder can be supported by the slanting wire 14 Even without support in the intermediate portion of the timber 1, it is possible to prevent the buckling in large parts of the moment. For example, when a bridge is to be installed over an intersection in front of a station, it is difficult to secure a place for assembling the descending vent B corresponding to the bridge piers K2 and K3 at the intermediate point. Even if the lowering vent B is not assembled, the bridge girder member is lowered by only two lowering vents B1 and B2 near the pier K1 and the pier K4, and the pier K1, the pier K2, the pier K3, and the pier K4 are over. It can be mounted on.
In addition, when a narrow space can be secured, when descending on the pier, a combination of a sandal and a vertical jack is used, and the descent can only be made little by little, and the descent work takes time. For example, if it takes 20 hours to descend, it is necessary to block traffic for 4 hours at night for 5 days, which causes trouble for the economy and society. In the bridge girder delivery method of the present embodiment, the descending vent B2 assembled near the pier K4 and the descending vent B1 assembled near the pier K1 can be made large, so that a large descending jack 32 can be used, and the work time is reduced. It can be shortened to about 30 minutes.

Next, components used in the bridge girder horizontal construction method according to another embodiment of the present invention will be described.
FIG. 12 is a side view showing a state before the bridge girder member 1 is intercepted in the lateral construction method.
As shown in FIG. 12, before the bridge girder member 1 is taken over, the bridge girder member 1 is arranged in the horizontal vent C1, vent C2, vent C3, and horizontal vent C4 arranged in a straight line. Both end portions of the bridge beam member 1 are supported by the horizontal vent C1 and the horizontal vent C4, and an intermediate portion of the bridge beam member 1 is supported by the vent C2 and the vent C3. The horizontal vent C is constituted by a vent 31 and a horizontal rail 35. The pre-venting vent C corresponds to the pre-installation facility of claim 4. The vent 31 is placed on the ground, and a horizontal rail 35 is provided on the vent 31. A self-propelled movable carriage 36 is provided on the horizontal rail 35. The movable carriage 36 corresponds to the horizontal mounting stage of claim 4. A self-propelled movable carriage 36 can travel along the rail 35 from one end to the other end.

FIG. 13 is a plan view showing a process in which the bridge girder member 1 is intercepted in the lateral construction method. A bridge pier K1 (corresponding to the second pier of claim 3), K2, K3, and K4 (first of claim 3) in the vicinity of the straight vent V1, C2, V3, and C4 vent vent C4. Is equivalent to the bridge pier). Since the horizontal vent B is wide in the horizontal direction, the horizontal vent C1 is disposed beside the pier K1, and the horizontal vent C2 is disposed beside the pier K4.
Since the horizontal rail 35 is provided on the horizontal vent C in the horizontal direction, and the movable carriage 36 is provided on the horizontal rail 35, the bridge girder member 1 is supported by the movable carriage 36, and the movable carriage 36 is provided. Along with the movement of 36, it is possible to move laterally from above the vent C to above the pier K along the pre-rail 35.

Next, a bridge girder horizontal construction method according to another embodiment of the present invention will be described.
Since the horizontal-carrying vent C is wide in the horizontal direction and is provided with a horizontal rail 35 that is long in the horizontal direction, both ends of the bridge girder member 1 are horizontal in the process in which the bridge girder member 1 is horizontal. It is supported by a movable carriage 36 on a horizontal rail 35 provided on the vent C and moves along the horizontal rail 35. After the intermediate part of the bridge girder 1 is separated from the vent C2 and the vent C3, the support is lost.
However, since the bridge girder member 1 is long and heavy, if there is no support in the middle part of the bridge girder member 1, it is supported only at both ends of the bridge girder member 1, so the moment in the middle part of the bridge girder member 1 is very It is large and buckles in the middle part.
Therefore, when the bridge girder member 1 is taken, a preparatory step is required before the bridge girder member 1 is taken in order to prevent buckling in a portion having a large moment even if there is no support at the intermediate part of the bridge girder member 1.

[Preparation process]
FIG. 14 is a side view showing a state in which the bridge girder member 1 is in a preparation process in the horizontal construction method.
As shown in FIG. 14, in the preparation process, construction girders 11 </ b> A and construction girders 11 </ b> B are respectively installed at both ends of the bridge girder member 1, and on the bridge girder member 1 at positions corresponding to the horizontal vents C <b> 1 and C <b> 4. The construction tower 12A and the construction tower 12B are respectively installed. The construction girder 11A and the top of the construction tower 12A are connected by a first diagonal suspension wire 13A, and the top of the construction tower 12A and the intermediate portion of the bridge girder member 1 are connected by a second diagonal suspension wire 14A. Similarly, on the opposite side of the bridge girder member 1, the work girder 11 </ b> B and the top of the work tower 12 </ b> B are connected by a first slanting wire 13 </ b> B, and the top of the work tower 12 </ b> B and the intermediate part of the bridge girder member 1 are second They are connected by the slanting wire 14B.
Since the operation and effect of each part in the preparation process have already been described in the delivery process, they are omitted here.

[Preparation process]
After the preparation process is finished, there is no risk of buckling even if the intermediate portion of the bridge girder member 1 is pulled by the second slanting wire 14 and is not supported by the vents C2 and C3. It is supported by the movable carriage 36 on the vents C1 and C4, and moves in the Y direction along the horizontal rail 35 along with the movement of the movable carriage 36. Moved sideways.

As explained in detail above, according to the bridge girder horizontal construction method of the present embodiment, the construction girder 11 is installed at the end of the bridge girder member 1, and the bridge girder member 1 is crossed on the bridge girder member 1. The construction tower 12 is installed at a position corresponding to the pre-venting vent C, and a first slanting wire 13 that connects the construction tower 12 and the construction girder 11 is connected to the intermediate portion of the construction tower 12 and the bridge girder member 1. Performing the pre-sparing process in a state where the two slanting suspension wires 14 are installed, and removing the construction girder 11, the construction tower 12, the first slanting suspension wire 13, and the second slanting suspension wire 14 after the end of the pre-sparing step, Therefore, when the bridge girder member 1 is supported by the movable carriage 36 and moves in the Y direction along the horizontal rail 35 with the movement of the movable carriage 36, the moment at the intermediate part of the bridge girder member 1 is 1 slanting wire 13 and 2nd slanting wire Because it supported in ear 14, even without the support of the middle section of the bridge girder member 1, it is possible to prevent the buckling in large parts of the moment. For example, when a bridge is to be installed above an intersection in front of a station or the like, it is difficult to secure a place for installing a crane for assembling a horizontal installation on bridge piers K2 and K3 at an intermediate point. If the construction and construction method of the present embodiment are adopted, the bridge girder member is intercepted and lowered by only two pre-installation vents C1 and C4 near the pier K1 and the pier K4 without assembling the pre-installation equipment on the pier. It can be placed on K1, pier K2, pier K3, and pier K4.
Moreover, in the bridge girder horizontal construction method, the construction girder 11 is installed at both ends of the bridge girder member 1, and the horizontal vent C is installed at both ends of the bridge girder member 1, corresponding to each of the horizontal vents C1 and C2. The construction tower 12 is installed at the position, and the first oblique suspension wire 13 and the second oblique suspension wire 14 are installed in each of the 12 construction towers. The tensile force in the intermediate part of the bridge girder member 1 is large, and the number of the horizontal installation facilities can be reduced.
Moreover, if it implements at the both ends of the bridge girder member 1, the balance with respect to the bridge girder member 1 is good, and there is no fear that the force concerning the construction tower 12 etc. on one side is too large.

As mentioned above, although the Example was shown about the bridge girder sending-out construction method and the bridge girder horizontal construction method concerning this invention, this invention is not limited to this Example, A various change is possible in the range which does not deviate from the meaning.
For example, in the bridge girder delivery method, in order to lower the bridge girder member, the combination of the sanddle and the vertical jack is installed and constructed on the first pier and the second pier without using the lowering vent and the lowering device. Even in this case, the work time for lowering the bridge girder member can be shortened.

DESCRIPTION OF SYMBOLS 1 Bridge girder member 11 Construction girder 12 Construction tower 13 1st slanting wire 14 2nd slanting wire 16 Extender 21 Front trolley 22 Back trolley 36 Movable trolley B Descent vent C Side vent K1 Second pier K4 First pier

Claims (5)

In the bridge girder delivery method that spans from the first pier to the second pier by running the delivery carriage on which the bridge girder is placed,
A construction girder is installed at the end of the bridge girder member,
On the bridge girder member, a construction tower is installed at a position corresponding to a lowering vent for lowering the bridge girder member, a first slanting wire connecting the construction tower and the construction girder, and the construction tower, Performing a girder lowering step in a state in which a second slanting wire connecting the intermediate point of the bridge girder member is installed;
After completion of the girder lowering step, removing the construction girder, the construction tower, the first slanting wire, and the second slanting wire;
Bridge girder delivery method characterized by In the bridge girder delivery method according to claim 1,
The construction girder is installed at both ends of the bridge girder member;
The descent vents are installed at both ends of the bridge girder, construction towers are installed at positions corresponding to the descent vents, and the first wire and the second wire are installed in each of the construction towers. That
Bridge girder delivery method characterized by In the bridge girder delivery method according to claim 2,
A bridge girder feeding method characterized in that the bridge girder member is constructed by using a combination of a sanddle and a vertical jack on the first pier and the second pier without using the lowering vent and the lowering device. In the bridge girder horizontal construction method that bridges from the first pier to the second pier by moving the horizontal platform on which the bridge girder is placed in the horizontal direction,
A construction girder is installed at the end of the bridge girder member,
A construction tower is installed on the bridge girder member at a position corresponding to a pre-installation facility for taking over the bridge girder member, a first slanting wire connecting the construction tower and the construction girder, the construction tower, and the Performing a pre-emption process in a state in which a second slanting wire connecting the intermediate point of the bridge girder member is installed;
Removing the construction girder, the construction tower, the first slanting wire, and the second slanting wire after completion of the pre-emption step;
Bridge girder horizontal construction method. In the bridge girder horizontal construction method according to claim 4,
The construction girder is installed at both ends of the bridge girder member;
The horizontal installation equipment is installed at both ends of the bridge girder member, and a construction tower is installed at a position corresponding to each of the horizontal installation equipment, and the first oblique suspension wire and the second oblique suspension wire are installed in each construction tower. Being installed,
Bridge girder horizontal construction method.

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