JPH09221718A - Girder erection method of bridge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an erection method which transfers a new girder to a spot under an existing girder at the head of an erected girder by means of a transportation truck which moves along the erected existing girder in the case when it is impossible to provide a movable passage for girders along an erection line in a river side and a water flowing area due to a geographical reason or the like when erecting girders of a bridge and then is capable of connecting this new girder to the head of the erected existing head girder. SOLUTION: An erection derrick 7, whose tip projects forward than the head existing girder 3a, is laid out on a head existing girder 3a during erection and a new girder 6 is hangingly moved to a spot under the head erected girder 3a by means of a transportation wire 9 of a transportation truck which moves along the erected existing girders 3 and then the lower end of a movable wire 17 suspended from the tip of the erection derrick 7 is connected to the top of the new girder 6. The new girder 6 is moved to a spot under an erection point in front of the head existing girder 3a by adjusting the length of either the transportation wire 9 or the movable wire 17 and replacing a suspension load of a girder by both wires at the front and rear positions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge girder erection method, and more specifically, in a method of constructing a new girder assembled at a erection site by successively hoisting the erection line on the erection line, The present invention relates to a erection method in which the trolley is moved from the assembly yard to a carriage that moves along an existing girder that has already been erected, and the trolley is moved to the mounting position and then connected to the leading existing girder.

[0002]

2. Description of the Related Art Among conventional bridge girder construction methods,
For example, when constructing a cable-stayed bridge, of which, in the case of erection on the sea, it is common to carry a new girder to the bottom of the erection on a pier and then lift it directly upward. In the case of erection inland that cannot be carried by, the new girder assembled in blocks is provided for movement, by providing a passage for the new girder along the erection line in the riverbed and running water part directly below the erection line. It is transported by a passage to a position slightly below the front existing girder that has already been erected, and the tip placed on the top existing existing girder that has been erected is on the lower end of the moving passage due to the derrick for erection that projects forward from the front existing girder. A common method is to hang a new girder and connect it to the tip of the existing girder already installed.

[0003]

In the erection method as described above, the new girder is transferred to the position above the erected top erected girder while being transferred to the position slightly below the head erected girder already installed by the moving passage. Since it is hoisted by the installed derrick for erection, the hoisted new girder is located in the front part of the erected head existing girder, and the new girder can be connected to the tip of the erected head existing girder without hindrance.

However, in this construction method, a passage for moving the new girder to a position slightly ahead of the position just below the already installed leading existing girder must be provided just below the erection line. It is good if the installation of the ridge does not pose a problem, but if the terrain is rapidly completed or there is a risk of flooding, there will be the problem that a passage cannot be easily installed.

[0005]

According to the present invention, when the bridge is erected as described above, it is not possible to provide a passage for moving the girder along the erection line in the riverbed or the running water part due to geographical conditions or the like. Even in this case, the construction method can be used to transfer the new girder to the position just below the already installed top existing girder by the carrier that moves along the already installed girder, and then connect this new girder to the tip of the already installed already existing girder. The purpose is to provide.

The invention of the erection construction method according to claim 1 is, as a concrete means therefor, fixedly disposing an erection derrick having a tip projecting forward of the leading existing girder on an existing girder of the existing girder under construction. Then, suspend the new girder to be erected by the carrying wire of the carrier that moves along the already installed girder, move it to just below the leading existing girder at the erection point, and then hang it from the tip of the derrick for erection. The lower end of the lowered transfer wire is connected to the upper surface of the new girder, and the length of either the transport wire or the transfer wire is adjusted so that the suspension load of the girder by both the wires in the front and rear positions is adjusted. It is characterized in that the new girder is moved to a position directly below the erection point in front of the leading existing girder by the transfer, and in this state, the new girder is lifted up and connected to the leading existing girder.

According to the invention of the erection method of claim 2, a new girder suspended from a carrying wire of a trolley and moved to a position right below a leading existing girder has a predetermined length hung from the tip of a derrick for erection. By connecting the lower end of the transfer wire and extending the length of the carrying wire, while transferring the load of the new girder to the transfer wire, transfer the new girder to the position just below the erection point in front of the new girder. It is characterized by being lifted up.

The invention of the erection method of claim 3 is a transfer of a predetermined length suspended from the tip of a derrick for erection to a new girder suspended from a carrying wire of a trolley and moved to a position right below a leading existing girder. By connecting the lower end of the wire and extending the length of the carrying wire while pulling the new girder backward from the rear of the erection point with the wire, the load of the new girder is suspended by the transfer wire. The feature is that the girder is moved to a position right below the erection point and the new girder is lifted up.

In the invention of the erection method of claim 4, the lower end of the transfer wire suspended from the tip of the derrick for erection is connected to the new girder suspended from the carrying wire of the trolley and moved to just below the leading existing girder. However, by winding up and shortening this transfer wire, the load of the new girder is suspended by the transfer wire while the new girder is transferred to the position just below the erection point in front, and the new girder is lifted upward. .

Further, in the invention of the erection method of claim 5, the length of one of the carrying wire and the transfer wire is adjusted to transfer the suspension load of the girder by the two wires at the front and rear positions. Thus, after moving the new girder to a position right below the erection point in front of the leading existing girder, the new girder is hoisted upward by the lifting cable at the tip of the derrick for erection, and is connected to the leading existing girder.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A bridge girder construction method according to the present invention will be described based on an example of a block girder construction method for a cable-stayed bridge. This construction method will depend on geographical conditions and the like. This method is effective when it is not possible to provide a passage for moving the new block girder to the erection point along the erection line in the section.
1 is a partial side view showing a main part of the erection method as the first embodiment, FIG. 2 is a side view showing the whole erection method, FIG. 2 is an overall plan view of the same, 1 is a tower, 2 is a cable, 3 Is a block-shaped existing girder that has already been installed and is supported by the cable 2.

In the erection method of the present invention, it is not possible to provide a passage for transferring the new girder 6 to the erection point in the riverbed A and the running water portion B as described above because of the geographical conditions and the like. A carriage 5 that moves along the existing girder 3 is provided on the existing girder 3, and a new girder 6 is hung and transferred by the carrier 5 to a position just below the top existing girder 3a that has been erected. Girder 6 has been erected Top existing girder 3a
The derrick for erection 7 fixedly arranged on the upper part of the erection system suspends the erected erected girder 3a to the front position.

As shown in FIGS. 4 and 5, the carriage 5 has hook portions 25 at both ends respectively engaged with both side edges of the existing girder 3, and a lower surface of the hook portion 25 is an upper surface of the existing girder 3. A pair of front and rear beam members 5 provided on the lower surface of the existing girder 3 so as to move along the bridge axis direction along rails 8 laid on both sides.
a and 5b, each having a carrying wire 9 for suspending the new girder 6 from the ground to a predetermined height position on the lower surface, and the carrying wire 9 can have a variable length. It has a pulley type length adjusting device 19. Also,
A work scaffold 21 used for work for connecting the new girder 6 to the leading existing girder 3a is provided at the tip of the front beam member 5a.

On the other hand, as shown in FIG. 1, the errick derrick 7 provided on the already installed leading existing girder 3a has a rear lower chord member 11 which is moved via a rail 10 to the central portion of the upper surface of the leading existing girder 3a. A vertical member 12 provided at the front end of the rear lower chord member 11 and a rear diagonal member 13 connecting the upper end of the vertical member 12 and the rear end of the rear lower chord member 11, and the upper end of the vertical member 12 A horizontal upper chord main girder 15 having a tip 16 protruding forward and upward from the leading existing girder 3a, and a main diagonal member 14 connecting the lower end of the vertical member 12 and the tip of the upper chord main girder 15.
And is constituted by.

A transfer wire 17 having a predetermined length for transferring the new girder 6 to a predetermined erection position below the tip 16 is suspended from the central portion of the derrick tip 16 for erection. As shown in FIG. 6, a lifting cable 18 for lifting the new girder 6 upward by a jack 20 is provided on both sides of the tip 16.

The erection process will be described. As shown in FIG. 3, the new girder 6 is assembled in the new girder assembly yard 22 provided on the riverbed A adjacent to the tower 1, and the assembled new girder 6 is assembled into the assembly yard. It is moved to just below the girder erection line by a relatively short transfer passage 23 that connects 22 and the girder erection line. At that time, the carrier 5 is being transferred to the existing installed girder 3 just above the transfer passage 23, and the new girder 6 is connected to the lower end of the carrier wire 9 of the carrier 5 and is hung. .

In this state, as shown in FIGS. 2 and 3, the carriage 5 is moved to just below the head existing girder 3a of the installed existing girder 3, and the new girder 6 is moved by the carrying wire 9 to the head existing girder 3a. Hang it just below.

At that time, the erection derrick 7 is also moved to a position directly above the erected head existing girder 3a, and the tip 16 is fixed in a state of protruding toward the front of the head existing girder 3a. The lower end of the transfer wire 17 having a predetermined length suspended from is connected to the central portion of the upper surface of the new girder 6 suspended by the front and rear two carrying wires 9,
As shown in FIG. 1, the length adjusting device 19 of the carrying wire 9 is operated to gradually extend the length of the carrying wire 9.

By operating the length adjusting device 19 to lengthen the carrying wire 9, the new girder 6 lowers from the initially suspended height position, but since the length of the transfer wire 17 does not change, it is carried. As the length of the wire 9 extends, the load of the new girder 6 is gradually transferred to the transfer wire 17. Then, the new girder 6 gradually moves from the position directly below the leading existing girder 3a to the front part of the leading existing girder 3a, and finally when the carrying wire 9 is fully extended, it is completely below the erection point by the transfer wire 17. Suspended in position.

In this way, the new girder 6 is transferred to the transfer wire 17
If the suspension cable 18 is suspended, the suspension cable 18 on both sides of the derrick tip 16 for erection is extended downward, and the lower end of the suspension cable 18 is transferred to the new scale girder 6 via the suspension balance 24, as shown in FIG. , The carrying wire 9 and the transfer wire 17 which have been suspending the new girder 6 up to now are removed from the new girder 6, and the lifting cable 18 is exclusively used.
The jack 20 is operated to pull up the new girder 6 to the front position of the head existing girder 3a, the rear end of the suspended new girder 6 is connected to the tip of the head existing girder 3a, and the cable 2 from the tower 1 is newly installed. Installation of the new girder 6 is completed by connecting it to the center part of the girder 6. After the erection is completed, the load of the derrick 7 for erection is stored in the carrier 5 to move the carrier 5 forward by one block, and the same steps are repeated thereafter.

FIG. 7 shows a second embodiment. In this embodiment, the construction of the carriage 5 for suspending the new girder 6 and the derrick 7 for erection is the same as the construction method of the above embodiment, but in this case In the construction method, the new girder 6 is hung by the carrying wire 9 of the carriage 5 and moved to just below the leading existing girder 3a, and the derrick tip 16 for erection is provided on the upper surface of the new girder 6.
After connecting the lower end of the transfer wire 17 having a predetermined length suspended from the upper end of the spare wire 27 fed from the winch 26 fixed to the ground behind the erection point, is connected to the rear end of the new girder 6. To do. The spare wire 27 is partially provided with a length adjusting device 28 so that the length can be freely adjusted.

In the construction method shown in this embodiment, when the new girder 6 is pulled by the spare wire 27 when the girder is erected, the length of the carrying wire 9 in the carriage 5 is the same as the construction method of the previous embodiment. By operating the adjusting device 19, the length of the carrying wire 9 is gradually extended, and at the same time, by operating the length adjusting device 28 of the spare wire 27, the length of the spare wire 27 is gradually extended.

As shown in the above embodiment, by gradually extending the length of the carrying wire 9, the new girder 6 is lowered from the initially suspended height position and the transfer wire 17 is moved downward. Since the length does not change, the load of the new girder 6 is gradually transferred to the transfer wire 17, but at that time, the new girder 6 is pulled by the rear spare wire 27 and the load is immediately transferred to the transfer wire 17. Give resistance.

Therefore, if the new wire 6 is pulled rearward by the spare wire 27 at the time when the new wire 6 comes to bear the load of the new wire 6, the new wire 6 will be hung from diagonally above by the new wire 17. Since it is possible to maintain the state in which the new girder 6 is suspended, even if the carrying wire 9 suspending the new girder 6 is slightly extended and removed from the new girder 6, the length of the spare wire 27 is gradually increased thereafter. As the new girder 6 is extended, the new girder 6 is suspended by the transfer wire 17 and gradually moves from a position directly below the leading existing girder 3a to a position immediately below the erection point in front of the leading existing girder 3a.

In this way, the new girder 6 is moved to the transfer wire 17
After moving to a position directly below the erection point by, the new girder 6 is hoisted by the hoisting cables 18 on both sides of the derrick tip 16 for erection and connected to the tip of the leading existing girder 3a, as in the case of the above-mentioned embodiment.

In the construction method of the first and second embodiments,
In both cases, the load of the new girder 6 is extended by extending the length of the carrying wire 9 while the new girder 6 is suspended by the carrying wire 9 of the carrier 5 and the transfer wire 17 of the derrick 7 for erection. Was moved to a position directly below the erection point of the front part of the leading existing girder 3a, but the new girder 6 hung at a position just below the leading existing girder 3a by the carrying wire 9 of the carriage 5 was installed on the derrick 7 for erection. Transfer wire 17
As a means for moving to a position directly below the installation point in front of the leading existing girder 3a, another construction method shown in FIG. 8 may be used.

In the construction method of the third embodiment shown in FIG. 8, the length of the carrier wire 9 of the carrier truck 5 is not adjusted during the operation of suspending the new girder 6, and the carrier wire 9 is set to a constant length, and the derrick 7 for erection is used. The transfer wire 17 of FIG.

At the time when the new installation girder 6 is hung on the carrying wire 9 of the carriage 5 and sent to the position just under the leading existing girder 3a, the lower end of the transfer wire 17 of the erection derrick 7 is moved to the new installation girder 6. When the connection wire 17 is connected and the transfer wire 17 is pulled upward by the operation of the jack 30, the new girder 6 remains suspended from the carrying wire 9 and moves from a position directly under the leading existing girder 3a to a position just under the erection point in front of the leading existing girder 3a. Suspended.

After that, as shown in FIG. 6, the derrick 7 for erection is installed.
The lower end of the hoisting cable hung from the above is connected to the new girder 6, the carrying wire 9 and the transfer wire 17 from which the new girder 6 has been hung up are removed from the new girder 6, and the jack 30 of the hoisting cable 18 is exclusively operated. Then, the new girder 6 is pulled up to the front position of the head existing girder 3a, and the installation of the new girder 6 is completed in the same manner as described above.

Although the above embodiments have described the girder erection of the cable-stayed bridge, the present invention can be applied to the ordinary box girder erection of the bridge as well as the girder erection of the cable-stayed bridge. In this case, the carriage for suspending and moving the new girder is not necessarily limited to the structure as shown in FIG. 4, and for example, as shown in FIG. ,
A pair of front and rear beam members 41 each having a length such that both ends 44 arranged on the upper surface of the existing girder 3 project outward from both side edges of the existing girder 3 are bridged along the rail 8 laid on the upper surface of the existing girder 3. The beam member 4 has a structure that moves along the axial direction.
It is also possible to suspend the temporary receiving beams 43 from both ends 44 of 1 via the carrying wires 42, and to move the new girders 6 placed on these temporary receiving beams 42.

In the first to third embodiments, the new girder 6 is suspended by the transfer wire 17 of the errick derrick 7 to a position directly below the erection point in front of the leading existing girder 3a, and then the new girder 6 is moved upward. A lifting cable 18 different from the transfer wire 17 was used as a means for lifting to the transfer wire 17.
You may use it as it is by giving it a winding function.

[0032]

According to the erection method of the present invention, the new girder 6 is hung on the carriage 5 that moves along the erected existing girder 3,
After transferring to a position directly below the top existing girder 3a, the lower end of the transfer wire suspended from the tip of the derrick for erection is connected to the upper surface of the new girder, and either one of the transport wire and the transfer wire is connected. By adjusting the length and transferring the suspension load of the girder by both the wires in the front and rear positions, the new girder that can be hung and moved only under the leading existing girder 3a only by the carriage 5 by the exchange of both wires. The 6 can be efficiently and safely moved to a position immediately below the erection point in front of the leading existing girder.

In the construction method shown in the first embodiment, the load of the new girder 6 is transferred only by the operation of moving the new girder 6 to the position directly under the head existing girder 3a by the carriage 5 and then extending the carrying wire 9. There is an advantage that it can be transferred to the wire 17, and in the construction method of the second embodiment, after transferring the new girder 6 to a position directly under the head existing girder 3a, the new girder 6 is pulled from behind by the spare wire 27. When the transfer wire 17 is connected to the new girder 6, the carrying wire 9 can be slightly extended thereafter to be removed from the new girder 6, and the new girder 6 is supported by the front and rear transfer wires 17 and the spare wire 27. Therefore, instead of extending the carrying wire 9 for suspending the new girder 6 as shown in FIG. 1, the winch 26 on the rear side feeds the spare wire 27. Relocation wire 1 new digit 6 safer
It can be changed to 7.

In the construction method of the third embodiment, the carriage 5
After transferring the new girder 6 to a position just below the leading existing girder 3a, the carrying wire 9 is left as it is, and the new girder 6 is moved.
By pulling up the transfer wire 17 connected to
Can be immediately moved to a position directly under the erection point in front of the leading existing girder, and the erection work can be performed efficiently in a short time.

Further, when the erection derrick 7 is provided with the transfer wire 17 for operating the new girder 6 and the lifting cable 18 separately, the new girder 6 is replaced with the head existing block girder 3.
Separately, the transfer function by the transfer wire 17 for suspending from the position directly below a to the front position and the suspension function by the suspension cable 18 for exclusively suspending the new girder 6 suspended to the front position to the erection position above. Therefore, the work for constructing the new girder 6 can be performed safely and quickly.

[Brief description of drawings]

FIG. 1 is a partial side view showing a girder erection method of a first embodiment according to the present invention. FIG. 2 is a side view of the same. Similarly, FIG. 3 is an overall plan view. FIG. 4 is a sectional view taken along the line CC of FIG. FIG. 5 is a plan view of the same portion as FIG. FIG. 6 is a partial side view showing the step of lifting a new girder in the same portion as FIG. 1. FIG. 7 is a partial side view showing the girder construction method of the second embodiment. FIG. 8 is a partial side view showing the girder construction method of the third embodiment. FIG. 9 is a sectional view of the same portion as FIG. 4 showing another embodiment of the carriage.

[Explanation of symbols]

 1: Tower 2: Cable 3: Existing girder 3a: Leading existing girder 5,40: Carrier 5a, 5b, 41: Beam material 6: Newly installed girder 7: Installation derrick 8, 10: Rail 9: Conveyor wire 16: Erection Derrick tip 17: Transfer wire 18: Lifting cable 19, 28: Length adjusting device 20, 30: Jack 21: Working scaffold 22: Manufacturing yard 23: Transfer passage 24: Suspended balance 25: Hook part 26: Winch 27: Regret wire

Claims (5)

[Claims] 1. A erection derrick whose tip projects forward of the leading existing girder is fixedly arranged on the leading existing girder of the existing girder under construction, and a new girder to be erected is installed along the already installed girder. Suspended by the carrying wire of the moving carriage and moved to just below the leading existing girder at the erection point, then connect the lower end of the transfer wire suspended from the tip of the derrick for erection to the upper surface of the new girder. Adjusting the length of either one of the carrying wire or the transfer wire and transferring the suspension load of the girder by both the wires at the front and rear positions to move the new girder forward of the leading existing girder. A bridge girder erection method characterized by moving directly below the erection point and lifting a new girder upward in this state to connect it to the leading existing girder. 2. A lower end of a transfer wire of a predetermined length suspended from the tip of a derrick for erection is connected to a new girder that is hung from a carrying wire of a trolley and moved to a position just below a leading existing girder, By deferring the length of the carrying wire,
The bridge girder erection method according to claim 1, wherein the load of the new girder is suspended by the transfer wire, the new girder is moved to a position right below the erection point, and the new girder is lifted upward. 3. A new girder suspended from a carrier wire of a transporting carriage and moved to a position just below an existing girder head is connected to a lower end of a transfer wire of a predetermined length suspended from the tip of a derrick for erection. By extending the length of the carrying wire while pulling the new girder backward from the erection point with a slack wire, the load of the new girder is suspended on the transfer wire and the new girder is moved directly below the erection point. The bridge girder erection method according to claim 1 or 2, wherein the new girder is lifted upward by transferring. 4. A new girder suspended from a carrying wire of a carrier and moved to a position just below an existing girder at the top is connected to a lower end of a transfer wire suspended from a tip of a derrick for erection, and the transfer wire is wound up. The bridge girder erection method according to claim 1, wherein, by shortening the load, the load of the new girder is hung on the transfer wire, the new girder is moved to a position just below the front erection point, and the new girder is lifted upward. 5. The new girder is moved from the leading existing girder by adjusting the length of either the carrying wire or the transfer wire and transferring the suspension load of the girder by the two wires in the front and rear positions. The method of constructing a bridge girder according to any one of claims 1 to 4, wherein the new girder is lifted upward by a hoisting cable at the tip of the derrick for erection and is connected to the leading existing girder after moving just below the erection point in front.