JP2001049622A - Bridge erecting apparatus and bridge erecting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bridge erecting apparatus for use in overhang erecting method, which is reduced in weight and in size. SOLUTION: The bridge erecting apparatus 1 comprises a mobile operating truck 2, and an elevating means (elevating device 4). The mobile operating truck 2 has a base 21 and a hanging substrate (lifting frame 22) and can move on a bridge (bridge pier, bridge girder 7) along a bridge length direction. The elevating means 4 is supported by the mobile operating truck 2. The elevating means 4 is constituted of a PC steel twined wire 5, and a hydraulically driven elevating machine (center hall jack 40).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge erection device used for an overhanging erection method and a method for erection of a bridge using the bridge erection device.

[0002]

2. Description of the Related Art Conventionally, as a method of erection of a bridge, an overhanging erection is carried out in which a precast segment (hereinafter, referred to as a "PC segment") manufactured in advance in a factory or a yard is maintained while maintaining a balance on both sides around a pier. The construction method is used. Various methods are used in this method depending on the type of erection equipment. One example of this method is a PC using an overhang type bridge erection device (commonly called “erection nose”) installed on a pier or an existing bridge girder. There is a construction method in which the PC segments are sequentially joined while the segments are lifted up and supported by an oblique suspension material from a pier.

An overhang type bridge erection device for lifting a PC segment used in the above-mentioned construction method has been constituted by a movable work vehicle and a lifting means supported by the movable work vehicle. Further, the lifting means has a structure in which a wire rope as a suspending material is wound by a winch, and includes a cylinder-type hydraulic jack for exchanging PC segments near a bridge girder to increase lifting accuracy. That was common.

[0004]

However, the tensile load of the wire rope is limited, and a large number of lifting devices are required to lift a segment of several hundred tons. When a winch is used, a heavy equipment such as a winch drum and a sheave block must be used, and a hydraulic jack for transferring a load must be provided. For this reason, the overhang type bridge erection apparatus must be made to have a robust structure, and the apparatus becomes large, and handling of the overhang type bridge erection apparatus becomes complicated, and the work time and the construction cost increase. In addition, the construction cost of the bridge girder on which the overhang type bridge erection device is installed must be set excessively high, so that the construction cost is relatively high. Conventionally, a bridge type crane using a hydraulic jack and a step rod (a stepped rod) as a lifting means has existed. However, in view of tensile load and workability, a bridge type crane is used for an overhang type bridge erection apparatus. Had not been.

Further, in the overhang construction method using the overhang type bridge erection device, the overhang type bridge erection device is attached to both ends of the overhang erection portion around the pier, and the PC segment is maintained while maintaining the weight balance of both ends. The work is carried out by lifting up and erection at a predetermined position. At this time, first, overhang type bridge erection equipment is installed on the pier,
The subsequent work will be performed while sequentially moving the overhang type bridge erection device on the existing bridge girder in both the left and right directions.

However, as shown in FIG. 5, the upper part of the pier 6 'is not constructed to have the necessary size for installing two overhang-type bridge erection devices L1', R1 '. Therefore, in the conventional method, the overhang type bridge erection device L1 ′ for erection of the PC segment in one of the left and right directions is installed first on the pier 6 ′, and one or two segments 90 are erected. After that, the overhang type bridge erection device L1 'is moved onto the erected segment 90 to secure the installation space above the pier 6', and then the overhang type bridge erection device for erection of the PC segment in the other direction. The work of installing R1 'was performed.

[0007] Therefore, according to the conventional method, the load of the PC segment acts on the bridge girder erected before the bridge pier, and a large rotational moment acts on the pier. Therefore, it is necessary to set the design strength of the pier excessively, and the construction cost is relatively high. In addition, since it is necessary to install the left and right overhang type bridge erection devices on the pier in two separate steps, the work time and construction costs associated with the installation work have increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned various problems, and provides a lightweight and compact bridge erection apparatus for use in an overhanging erection method. An object of the present invention is to provide an efficient bridge erection method using an erection device.

[0009]

SUMMARY OF THE INVENTION In summary, the present invention according to claim 1 is a mobile work vehicle capable of moving in a bridge length direction on a bridge having a base and a suspension base, and the mobile work vehicle. In a bridge erection apparatus comprising a lifting means supported by a bogie, the lifting means includes a PC steel stranded wire and the P
The present invention provides a bridge erection apparatus comprising a hydraulically operated lifting machine for lifting a C steel strand. Here, it is preferable to use a center hole jack for the hydraulically operated lifting machine.

Therefore, according to the bridge erection apparatus of the present invention, since the lifting means is constituted by the hydraulically operated hoist and the PC strand, the bridge erection apparatus can be remarkably reduced in weight. Further, by using a center hole jack for the hydraulically operated lifting machine, a lifting object having an excessive weight can be easily lifted.

The present invention described in claim 2 is the same as the claim 1.
The present invention provides a bridge erection method characterized by lifting a bridge girder separately manufactured by the bridge erection device described in (1) and sequentially joining the bridge pier or an existing bridge girder.

Therefore, according to the present invention, by using the bridge erection device according to the first aspect, which is reduced in weight,
The handling such as moving and fixing the bridge erection apparatus becomes easy, and the working time, the construction cost and the like can be greatly reduced, and the safety of the work can be secured.

According to a third aspect of the present invention, there is provided the bridge erection apparatus according to the first aspect, wherein the bases of the movable work vehicle are integrated so that the traveling directions are away from each other. And an integrated bridge erection device characterized in that the two bridge erection devices are configured to be separable in the traveling direction of each other.

Therefore, according to the present invention, it is possible to form an integrated bridge erection apparatus which can be installed on a pier by using the bridge erection apparatus according to claim 1 which is reduced in weight and size. it can.

Further, the present invention according to claim 4 provides a bridge erection method characterized by including the following steps. (1) The integrated bridge erection device according to claim 3 is installed on a pier, a bridge girder divided and manufactured using each of the bridge erection devices is lifted, and the lifted bridge girder is simultaneously joined to the pier. One step. (2) A second step of separating the two bridge erection devices constituting the integrated bridge erection device and moving each of the bridge erection devices to both ends on a bridge girder joined to the pier. (3) A third step of lifting the bridge girder dividedly manufactured using each of the bridge erection devices and simultaneously joining the lifted bridge girder to an existing bridge girder. (4) Each of the bridge erection devices is moved to both ends on the existing bridge girder, and the bridge girder divided and manufactured using each of the bridge erection devices is lifted, and the bridge girder lifted to the existing bridge girder is simultaneously joined. A fourth step of sequentially joining the divided bridge girders by repeating the above steps.

It should be noted that joining the suspended bridge girders at the same time does not mean joining completely at the same time, but joining them almost simultaneously to such an extent that the weight of the suspended bridge girders can be maintained. Means

Therefore, according to the present invention, by using the integrated bridge erection device according to the third aspect, the installation on the pier can be completed by one operation, and the bridge erection can be efficiently performed. It can be carried out.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. In the present embodiment, the bridge is erected using a PC segment 9 previously manufactured in a factory or a yard or the like as a bridge girder divided and manufactured.

(1) Configuration of Bridge Construction Apparatus 1 As shown in FIGS. 1 and 2, the bridge construction apparatus 1 of the present invention
Is composed of a mobile work vehicle 2 and a lifting device 4 (lift means) supported by the mobile work vehicle 2.

Mobile work vehicle 2 The mobile work vehicle 2 includes a pair of bases 21 provided in the bridge length direction and a lifting frame 22 (suspended at the ends of the pair of bases 21). Upper substrate). A plurality of wheels (not shown) are pivotally provided at predetermined positions of the base 21, and can be moved on rails 8 laid on the pier 6 and the existing bridge girder 7 by moving means (not shown). Has become.

The lifting frame 22 is mounted on each base 21.
A main frame 23 composed of vertical members 23a, 23a and a horizontal member 23b erected at the end of the main frame 23, an upper pedestal 24 protruding from an upper portion of the main frame 23, and a horizontal erected on the upper pedestal 24. The main part of the cross beam 25 is formed from the cross beam 25.

The main frame 23 includes a diagonal member 23c provided at a diagonal line of a frame composed of a vertical member 23a and a horizontal member 23b, and an end of the upper part of the vertical member 23a and the base 21 on the pier 6 side. The reinforcement 26 is provided between the reinforcement members. Further, the lower portion of the cross beam 25 and the tip of the base 21 are also reinforced by a stay 27. The mobile work vehicle 2 is fixed to the pier 6 or the bridge girder 7 by an anchor 28 at the end of the base 21 on the pier 6 side during the lifting operation.

Lifting Device 4 As shown in FIG. 2, the lifting device 4 is composed of a PC steel stranded wire 5 as a suspending material and a center hole jack as a hydraulically operated lifting device for lifting the PC steel stranded wire 5. 40 (VSL jack). The center hole jack 40 is fixed on the center of the cross beam 25 via a base plate 41 and a jack chair 42.

The PC steel strand 5 is provided so as to penetrate through the center hole jack 40, and the upper end thereof is fixed by an upper fixing mechanism 50 and a lower fixing mechanism 60. The upper fixing mechanism 50 and the lower fixing mechanism 60 allow the multiple strands of the PC steel stranded wire 5 to pass through the perforated disk, and by fitting a wedge into the perforated disk, thereby forming the PC steel stranded wire 5. Is fixed.

The lower end of the PC steel strand 5 is connected to a suspension member 80 for lifting the PC segment 9. The lifting device 4 can be moved in a direction perpendicular to the bridge length (the direction indicated by the white arrow in FIG. 1) by a lateral slide mechanism (formed of a hydraulic jack or the like) not shown. Further, the lifting device 4 and the cross beam 25 are integrated and can be moved in the bridge length direction (the direction indicated by the white arrow in FIG. 2) by a bridge length direction slide mechanism (formed of a hydraulic jack or the like) not shown. I have.

The center hole jack 40
The operation of will be briefly described. First, the lower fixing mechanism 6
In a state where the PC steel strand 5 is fixed and held by 0, the piston (both not shown) is raised by the hydraulic cylinder mechanism, the PC steel strand 5 and the PC segment 9 are lifted upward, and the load is applied to the upper fixing mechanism 50. Take over. Next, the load is transferred from the upper fixing mechanism 50 to the lower fixing mechanism 60 while maintaining the state. Then, by repeating the above operation, the PC steel strand 5 and the PC segment 9 can be lifted to a predetermined position.

(2) Integrated Bridge Construction Device 10 A) Configuration of Integrated Bridge Construction Device 10 The configuration of the integrated bridge construction device 10 will be described. Note that the same elements as those of the bridge erection apparatus 1 are denoted by the same reference numerals, and description thereof will be omitted. However, in order to distinguish between the left bridge erection device and the right bridge erection device and their elements, the symbols in the respective elements are preceded by L for the left bridge erection device and R for the right bridge erection device.
Will be appended.

As shown in FIG. 3, an integrated bridge erection device 1
Reference numeral 0 denotes a device that connects the two bridge erection devices L1 and R1. The traveling directions of the two bridge erection devices L1 and R1 are arranged so as to be away from each other (the left-right direction in FIG. 3), and the base of the movable work vehicle (hereinafter, referred to as the base).
The common base 21 ′) is common, and the upper bases L 24 and R 24 are connected by a connecting member 70 to form an integrated device.

The construction of the left bridge erection apparatus L1 is the same as that of the bridge erection apparatus 1 except that a connecting member 70 is provided. The right bridge erection device R1 is different from the bridge erection device 1 in that the base 21 ′ is common to the left bridge erection device L1 and that a retaining material (corresponding to the retaining material 26 shown in FIG. 2) is not provided. Is different. The left and right bridge erection devices L1 and R1 include a common base 21 ′ and a connecting member 70.
By uncoupling, it can be easily separated.

B) Method of Separating the Integrated Bridge Construction Apparatus 10 Here, referring to FIG.
The method for separating the R1 and R1 will be described.
Are joined, and the pier 6 and the PC segment L9,
It is assumed that the rails 8 are laid on R9.

First, the joined PC segments L9, R
9 using the rails 8 laid on the vehicle 9 and moving means (not shown) to connect the integrated bridge erection device 10 to the right PC.
Move over segment R9. The lower part and right side P of the vertical member R23a in the main frame R23 of the right bridge erection device R1.
A steel block 72 is inserted between the C segments R9, and the right PC segment R is inserted by an anchor (not shown).
9 and the longitudinal member R23a are fixed. In addition, a temporary stay 73 is attached between the vertical member R23a in the right bridge erection device R1 and the lower position of the lifting device R1 in the upper gantry R24,
Supports the right bridge erection device R1. Next, the common base 21 ′
And the connecting member 70 to the vertical member R23a of the right bridge erection device R1.
Then, the left bridge erection device L1 is moved onto the left PC segment L9 by a moving means (not shown) (FIG. 4A).

Subsequently, the vertical member R23 of the right bridge erection device R1
At the bottom of a, while attaching a new base R21,
A stay R26 is provided on the main frame R24, and the temporary stay 73 is provided.
Is removed to make the same bridge erection device on the left and right (FIG. 4 (b)). The bridge erection device L thus separated
Needless to say, 1, R1 can perform bridge construction work independently.

(3) Bridge Construction Method An example of a bridge construction method using the integrated bridge construction apparatus 10 of the present invention will be described. Here, as shown in FIG.
The two integrated bridge erection devices 10 are provided side by side in the right and left directions in the direction orthogonal to the bridge length, and the two integrated bridge erection devices 10 work together to lift the PC segment 9. . The required number of PC segments 9 to be lifted and joined are prepared in advance, and are transported by a carrier (not shown) to a bridge girder to be joined, and the PC steel strands 5 are locked. 1 (refer to FIGS. 1 and 2) is provided at a predetermined position.

Further, in the bridge erection method of the present invention, the PC segments are joined in both the left and right directions with the pier 6 as a center. The nth PC segment provided on the left side is referred to as a left n segment, and the nth PC segment provided on the right side of the pier is referred to as a right n segment for convenience.

The bridge erection method of the present invention is characterized by including the following first to fourth steps. Hereinafter, each step will be described in detail.

1) First Step As shown in FIG. 3, this step is performed by an integrated bridge
Is installed on the pier 6, and the PC segments L9, R9 are lifted using the left and right bridge erection devices L1, R1, and the PC
This is a step of joining the segments L9 and R9 to the pier 6 substantially simultaneously.

First, the rail 8 is laid on the pier 6, and the integrated bridge erection device 10 is installed on the rail 8. Next, the right center segment jack R40 lifts the right one segment R9 while the left center segment jack L40 lifts the left one segment L9. After lifting the left and right one segment L9, R9 to the joint height,
At the same time, the right and left segments are joined to the pier 6. In the joining work, the PC segments L9 and R9 are lifted up to the erection position, and after crimping with an adhesive, the prestressing cable is
Insert into the sheath provided in C segment L9, R9,
The grout material is injected while the tension is applied, and the members are erected and joined one by one.

It should be noted that the above-mentioned connection of the lifted PC segments L9 and R9 to the pier 6 substantially simultaneously means that an excessive rotation moment is applied to the pier 6 by maintaining the weight balance of the lifted PC segments L9 and R9. It is joined so as not to occur. This means
The same applies to a third step described later.

2) Second Step As shown in FIG. 4A, this step separates the left and right bridge erection devices L1 and R1 constituting the integrated bridge erection device 10 and connects the PC to the pier 6. This is a step of moving the respective bridge erection devices L1 and R1 to both ends on the segments L9 and R9. In this step, the rails 8 laid on the pier 6 are placed on the left and right one segments L9 and R9 joined in the first step.
After laying rail 8 'so as to connect with
According to the procedure described in B (separation method of the integrated bridge erection device 10), the left and right bridge erection devices L are respectively attached to both ends on the existing left and right one segments L9 and R9 joined to the pier 6.
1 and R1.

3) Third Step As shown in FIG. 4 (b), this step uses the left and right bridge erection devices L1, R1 to form the PC segments L9 ', R
9 ′ is lifted, and the PC segment L is attached to the existing bridge girder 7.
This is a step of joining 9 ′ and R9 ′ substantially simultaneously. First, similarly to the first step, while lifting the left two segments L9 ′ using the left center hole jack L40, the right two segments R9 ′ using the right center hole jack R40.
Hoist. Next, until the bridge girder 7 is joined,
After the segments L9 ', R9' are lifted, the work of joining the left and right two segments L9 ', R9' to the existing bridge girder 7 substantially simultaneously is performed.

4) Fourth Step In this step, the left and right bridge erection devices L1 and R1 are moved to both ends of the existing PC segment, and the PC segment is lifted using the left and right center hole jacks L40 and R40. This is a step of sequentially joining the PC segments by repeating the operation of joining the lifted PC segments almost simultaneously to the existing bridge girder a plurality of times. The movement of the bridge erection devices L1 and R1 and the joining method of the PC segments are basically the same as those in the second and third steps, but after the bridge girder reaches a predetermined length, the pier 6 A support cable tensioned from the top would add the step of supporting the PC segment.

In the bridge erection method, it is also possible to use other construction methods in an auxiliary manner. In the above description, the bridge erection method using the integrated bridge erection device 10 has been described.
Needless to say, the same operation as the bridge erection method can be performed.

As described above, an example of a preferred embodiment of the present invention has been described. However, the present invention is not limited to the embodiment, and each component may be appropriately changed in design without departing from the gist of the present invention. It is possible. In particular, the structure of a movable work vehicle is not limited as long as it can move on a pier or an existing bridge girder, and can support a separately manufactured bridge girder lifted by a lifting device. It is.

[0044]

According to the bridge erection apparatus of the present invention, since the lifting means is constituted by a hydraulically operated hoist and a PC stranded wire, the bridge erection apparatus can be remarkably reduced in weight. Since the bridge erection device is installed at the tip of the bridge girder and performs its work, the weight of the device greatly affects the strength of the bridge girder. Therefore, by reducing the weight of the bridge erection device, the stress acting on the pier and the bridge girder can be reduced, so that the safety of work can be improved. In addition, since the weight of the bridge erection device is reduced, the uplift of the bridge erection device is reduced, so that the diameter and the number of anchor steel materials supporting the bridge erection device can be reduced, and the bridge erection device can be moved and fixed. And the like can be easily handled, and the working time, construction cost, and the like can be significantly reduced.

According to the integrated bridge erection apparatus and bridge erection method of the present invention, it is possible to erected a bridge girder that is separately manufactured on the left and right at the same time around the pier. Therefore, the bridge girder can be erected without giving an excessive rotation moment to the pier.Therefore, it is not necessary to design the pier assuming that a large bending stress is applied, and the cost can be reduced. it can. In addition, according to the integrated bridge erection apparatus of the present invention, the installation on the pier can be completed by one operation, so that the bridge can be efficiently erected.

Since the present invention has the above-mentioned features, it is very effective for erection of a bridge having a long span such as a cable-stayed bridge or an extradosed bridge.

[Brief description of the drawings]

FIG. 1 is a front view showing a bridge erection apparatus of the present invention.

FIG. 2 is a side view showing a bridge erection apparatus of the present invention.

FIG. 3 is a side view showing the integrated bridge erection apparatus of the present invention.

FIG. 4 is a side view showing a bridge erection method using the integrated bridge erection device of the present invention.

FIG. 5 is a side view showing a conventional bridge erection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bridge construction apparatus 2 Mobile work vehicle 4 Lifting apparatus 5 PC steel strand 6 Bridge pier 7 Bridge girder 8,8 'Rail 9 PC segment 10 Integrated bridge construction apparatus 21 Base 21' Common base 22 Lifting frame 23 Main frame Reference Signs List 24 Upper mount 25 Cross beam 40 Center hole jack 50 Upper fixing mechanism 60 Lower fixing mechanism 70 Connecting material

Continued on the front page (72) Inventor Akira Okito 3-2-26 Nishi-Shinjuku, Shinjuku-ku, Tokyo Tachibana Shinjuku Building VSL Japan Co., Ltd. F-term (for reference) in Bern Street VSL International Co., Ltd. 2D059 AA05 CC03 CC06 DD03 GG55

Claims (4)

[Claims] 1. A bridge erection comprising: a movable work vehicle movable in a bridge length direction on a bridge including a base and a lifting base; and a lifting means supported by the movable work vehicle. In the apparatus, the lifting means includes a PC steel stranded wire and a hydraulically operated lifting machine that lifts the PC steel stranded wire. 2. A method of erection of a bridge, comprising: lifting a bridge girder dividedly manufactured by the bridge erection apparatus according to claim 1 and sequentially joining the bridge girder to an existing pier or an existing bridge girder. 3. The movable work vehicle base is integrally formed using two of the bridge erection devices according to claim 1 so that the traveling directions are away from each other. An integrated bridge erection device, wherein the bridge erection devices are configured to be separable in the traveling direction of each other. 4. A method for erection of a bridge, comprising the following steps: (1) The integrated bridge erection device according to claim 3 is installed on a pier, a bridge girder divided and manufactured using each of the bridge erection devices is lifted, and the lifted bridge girder is simultaneously joined to the pier. One step. (2) A second step of separating the two bridge erection devices constituting the integrated bridge erection device and moving each of the bridge erection devices to both ends on a bridge girder joined to the pier. (3) A third step of lifting the bridge girder dividedly manufactured using each of the bridge erection devices and simultaneously joining the lifted bridge girder to an existing bridge girder. (4) Each of the bridge erection devices is moved to both ends on the existing bridge girder, and the bridge girder divided and manufactured using each of the bridge erection devices is lifted, and the bridge girder lifted to the existing bridge girder is simultaneously joined. A fourth step of sequentially joining the divided bridge girders by repeating the above steps.