JP2000064227A - Bridge erection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve workability, shorten a construction period and reduce erection cost, compared with the cantilever overhanging erection method, after enabling an arch part to be erected even in the erection environment where the field assembly of a Melan material is difficult, regarding a bridge erection method for erecting the arch part of a concrete arch bridge. SOLUTION: Melan material constituent blocks 14b are sequentially suspended from a main cable 112 extended between supports 16 erected as a pair at both sides of a bridge erection position, and connected to each other for assembling a Melan material 14B'. Then, both ends of the Melan material 14B' are connected to the forward ends of each overhanging erection part 14A and closed. As a result, the need of the field assembly of the Melan material 14B' is eliminated and the all weight thereof is held on the main cable 112, thereby eliminating the need of stress control at the time of assembling the Melan material 14B'. At the same time, the Melan material 14B' can be assembled in parallel with the construction work of an overhanging erection part 14A. Furthermore, a direct suspending facility used for other bridge erection works can be transferred for use for the assembly of the Melan material 14B'.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge construction method for constructing an arch portion of a concrete arch bridge.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing an arch portion of a concrete arch bridge, a pair of overhanging construction portions extending from both sides of a bridge construction position are closed at a melan joint construction portion.
The so-called melanin method is known.

As this melanin construction method, there is known a construction method in which a melanin material assembled on the ground is lifted up to the extension of both overhanging portions and connected to these, but the bridge portion of the arch bridge is erected by the melanin material. In many cases, it is in a difficult environment, and in such a case, a cantilever overhanging construction method using an oblique suspension is generally used.

This cantilever overhanging method is a method of overhanging and extending the melanin material from a pair of pillars erected on both sides of the bridge erection position or from a pillow installed on each of these pillars, and then erectioning and extending the melanin material to the center. It is designed to be closed.

[0005]

However, in the above cantilever overhanging construction method, since the arch portion is constructed by cantilever overhanging over the entire range, it is necessary to strictly control stress during the erection. There is a problem that the construction period will be long. Further, it is impossible to divert PC steel materials such as oblique suspension materials used for cantilever overhanging from those normally used for other bridge erection, which causes a problem that construction cost becomes high. .

The present invention has been made in view of the above circumstances, and enables the arch portion to be erected even in a bridging environment where it is difficult to assemble the melanin material, and the cantilever overhanging construction method. It is an object of the present invention to provide a bridge construction method capable of improving the workability, shortening the construction period, and reducing the construction cost compared to

[0007]

According to the present invention, the above object is achieved by assembling the melanin material in a state of being directly suspended.

That is, according to the first aspect of the present invention, as described in claim 1, the arch of the concrete arch bridge is constructed by closing the pair of overhanging erection portions extending from both sides of the bridge erection position with the melanin erection portion. In the bridge erection method of erection of a portion, a cable is stretched between a pair of stanchions erected on both sides of the bridge erection position, and a plurality of melanin material building blocks are hung and supported on the cable, and the both bulging erection portions are supported. In the state of being placed on the extension of the above, the step of assembling the melanin material by connecting these melanin material building blocks to each other, the step of connecting both ends of the melanin material to the tip end portions of the respective overhanging parts, and the melanin material And a step of placing concrete so as to embed the above and constructing the above-mentioned melanin installation portion.

According to a second aspect of the present invention, the arch of a concrete arch bridge is constructed by closing a pair of overhanging erection portions extending from both sides of the bridge erection position with a melan section. In a bridge erection method of erection a part, a cable is stretched between a pair of stanchions erected on both sides of the bridge erection position so that the central part hangs close to the ground surface, and a plurality of melanin materials are formed on this cable. In a state where the blocks are suspended and supported, a step of assembling the melanin material by connecting these melanin material constituting blocks to each other, a step of connecting both ends of the melanin material with a tide cable, and a tip portion of each of the overhanging parts A step of suspending and supporting both ends of the melanin material and hoisting the melanin up to an extension of both of the overhanging parts; A step of connecting to an end, and Da設 concrete to fill the Melan material is characterized in that comprising the steps of applying the Melan-installing portion.

[0010]

As described above, according to the bridge construction method of the present invention, a plurality of melanin material building blocks are attached to a cable stretched between a pair of stanchions erected on both sides of the bridge construction position. Since the melanin material building blocks are linked together to assemble the melanin material, the melanin material can be assembled even in a bridging environment where the foundation of the melanin material is difficult. In addition, the following effects can be obtained.

That is, in the bridge erection method according to the present invention, since the weight of the melanin material is entirely supported by the cable, stress management when assembling the melanin material is not required, and compared with the cantilever overhanging method. Workability is greatly improved. In addition, assembling the melanin material can be performed in parallel with the construction of the overhanging erection portion, so that the construction period can be significantly shortened as compared with the cantilever overhanging construction method. Further, since the direct suspension installation equipment used for assembling the melanin material can be diverted from another bridge installation, the installation cost can be reduced as compared with the cantilever overhang installation method.

As described above, according to the present invention, the arch portion can be erected even in a bridging environment where it is difficult to assemble the melanin material, and the workability is improved and the construction period is improved as compared with the cantilever overhanging construction method. It is possible to reduce the length and the construction cost.

Particularly, in the bridge erection method according to the first aspect of the present invention, when assembling the melanin material, a plurality of melanin material building blocks suspended and supported by the cable are arranged on the extension of the two overhanging and erection parts. Since they are designed to be connected to each other, both ends of the assembled melanin material can be connected to the tips of the overhanging erection parts on the spot to perform the closing, thereby further improving the workability. You can

On the other hand, in the bridge erection method according to the second aspect of the present invention, when assembling the melanin material, a plurality of melanin material building blocks are suspended and supported by the cable stretched so that the central portion hangs near the ground surface. Therefore, it is necessary to lift the assembled Melan material up to the extension of the erection section on both sides, but it is possible to secure a sufficient sag amount of the cable, so the load of the direct suspension installation equipment can be reduced. It can be significantly reduced, which can significantly reduce the construction cost. Further, since it is possible to use a crane supported on the ground surface, workability is improved.

By the way, in the present invention, since the melanin material is assembled in a state of being directly suspended, it is possible to assemble the melanin material in a stress-free state. Therefore, prestress is introduced into the melanin material. Is possible.

Therefore, as described in claim 3, a prestress is introduced into the melanin material before connecting both ends of the melanin material to each overhanging portion, and the prestress is released after the connection is completed. By doing so, stress management of the assembled melanin material can be easily performed. Also,
By connecting both ends of the melanin material to the tips of the respective overhanging parts while prestressing in this way,
After that, it is possible to sufficiently resist the tensile stress generated when concrete is poured so as to embed the melanin material. As a result, the cross section of the melanin material can be reduced, so that the construction cost can be reduced due to the reduction of the weight of the steel material.

Although the specific method for "introducing prestress" is not particularly limited, for example, in the first invention of the present application, both ends of the melanin material are connected by tie cables. It is possible to adopt a method of introducing prestress using a tide cable, or a method of introducing prestress by inserting a hydraulic jack between both ends of the melanin material and the tip of each overhanging construction, Also,
In the second invention of the present application, a method of introducing prestress using a tied cable connected between both ends of the melanin material prior to lifting it can be adopted.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First, an embodiment of the first invention of the present application will be described.

FIG. 1 is a view showing a concrete arch bridge 10 which is a target of the bridge construction method according to this embodiment.

As shown, the arch bridge 10 includes a pair of foundations 12 constructed on the ground surface 2 on both sides of the bridge erection position.
The arch portion 14 is installed between the two, and the upper floor slab 20 is installed on the upper portion of the arch portion 14 via the bridge pier 16 and the vertical member 18, whereby the installation is performed.

As described later, the arch portion 14 is constructed by closing a pair of overhanging construction portions 14A extending from both foundations 12 with a melan joint construction portion 14B.

FIG. 2 is a diagram showing a process of constructing the arch portion 14.

First, as shown in FIG. 1 (a), a pair of foundations 12 are installed on both sides of the bridge erection position.
The columns to be the bridge piers 16 are respectively installed on the column 2. Further, the pillow 102 is installed on the upper end of each of the columns 16 and the back stay 104 is installed behind it.

Next, each foundation 12 using the Wagen 106
Concrete arch ribs 14A ′ are cantilevered along the arch axis, and the arch ribs 14A ′ are diagonally stretched from the columns 16 by diagonally extending cables 108.
By extending the arch ribs 14A ′ while supporting the above, the overhanging erected portion 14A is constructed. In addition,
Completion of both overhanging installation parts 14A is a stage of Drawing (c).

In parallel with this, the pillars 10 of both columns 16 are
A cable crane 110 and a main rope cable 112 are stretched between the two ends, and a back cable 114 is stretched behind the column 16. And the cable crane 1
A plurality of hanger ropes 118 are installed at predetermined intervals on the main rope cable 112 by the carrier 116 movably attached to the cable 10.

Subsequently, as shown in FIG. 3B, the melanin material constituting blocks 14b are hung and supported on the carrier 116 one by one, and the hanger ropes 118 are hung to suspend the melanin material constituting block 14b on one side. The extension portions (14A) are sequentially arranged on the extension (on the arch axis) from the tip portion of the overhanging portion (14A), and these melanic material constituting blocks (14b) are connected to each other. Then, the melanin material 14B 'is assembled by performing the direct suspension connection work of the melanin material block 14b up to the tip of the other overhanging and constructing portion 14A.

Next, as shown in FIG. 3C, both ends of the melanin material 14B 'are connected by a tide cable 120,
Prestress is introduced into the melanin material 14B 'by the tide cable 120 (this will be described later). Then, in this state, both end portions of the melanin material 14B 'are connected to the tip portions of the respective projecting and extending portions 14A.

Thereafter, as shown in FIG. 3D, the prestressing by the tide cable 120 is released to remove the tide cable 120 and the main cable 11
2 and the hanging equipment such as the hanger rope 118 are also removed.

Finally, by using the wagen 106, concrete is placed so as to embed the melanin material 14B ', thereby constructing the melanin installation portion 14B and completing the arch portion 14.

FIG. 3 is a diagram showing how the melanin material 14B 'is deformed by the introduction of the prestress, and FIG.
FIG. 4 is a detailed view of IV section in FIG. 3.

As shown in FIG. 3, the melanin material 14B 'is
Prestress is introduced by applying tension T to the tide cable 120 connected between both ends thereof, and the bending moment causes the prestress to slightly deform as shown by the broken line in the figure.

In this state, as shown in FIG. 4, after connecting both ends of the melanin material 14B 'and the tip of each overhanging erection portion 14A, the end surfaces of both ends of the melanin material 14B' and each bulge are connected. Mortar (early-strength mortar) M is placed between the end portion of the erection portion 14A and the end surfaces to close the space between the end surfaces.
The prestress caused by

As described above in detail, in the bridge construction method according to this embodiment, the main rope cable 112 stretched between the pair of stanchions 16 erected on both sides of the bridge construction position is provided with a plurality of melanin materials. Since the melanin material block 14b 'is assembled by connecting the melanin material block 14b to each other in a state where the building block 14b is suspended and supported, the melanin material can be formed even in a bridging environment where it is difficult to assemble the melanin material. Assembly can be done.

Moreover, in this embodiment, the melanin material 1 is used.
Since the weight of 4B 'is entirely supported by the main cable 112, stress management at the time of assembling the melanin material 14B' is not required, and the workability is greatly improved as compared with the cantilever overhanging method. Particularly in the present embodiment, the melanin material 14
When assembling B ′, the plurality of melanin material building blocks 14b suspended and supported by the main rope cable 112 are connected to each other in a state of being arranged on the extension of both overhanging erection portions 14A, so that the assembled melanin is assembled. Both ends of the material 14B 'can be connected to the tip end portions of the respective projecting and overhanging portions 14A on the spot to perform the closing, and thus the workability can be further improved.

In this embodiment, the melanin material 14 is used.
Since B'can be assembled in parallel with the construction of the overhanging erection portion 14A, the construction period can be significantly shortened as compared with the cantilever overhanging construction method.

Further, in this embodiment, the melanin material 14 is used.
Since the directly suspended erection equipment such as the main cable 112 and the hanger cable 118 used for assembling B ′ can be diverted from those used in other bridge erection, the erection cost is higher than that of the cantilever erection method. Can be reduced.

As described above, according to the present embodiment, the arch portion can be erected even in a bridge environment where it is difficult to assemble the melanin material, and the workability is improved as compared with the cantilever overhanging construction method. It is possible to reduce the construction period and the construction cost.

Further, in this embodiment, the melanin material 14 is used.
In view of the fact that B ′ can be assembled in a stress-free state of direct suspension, prestress is introduced into the melanin material 14B ′, so that stress management of the assembled melanin material 14B ′ is facilitated. It can be carried out. Also,
In such a prestressed state, the melanin material 14
By connecting both ends of B'to the tip of each overhanging erection portion 14A, it is possible to sufficiently resist the tensile stress generated when concrete is placed so as to bury the melanin material 14B 'thereafter. As a result, it is possible to reduce the cross section of the melanin material 14B ', so that it is possible to reduce the construction cost due to the reduction of the weight of the steel material.

By the way, in this embodiment, the tide cable 120 connected between both ends of the melanin material 14B '.
By applying tension T to the melanin material 14B ', prestress is introduced.
As shown in FIG. 2, the hydraulic jack 12 is provided between the end faces of both ends of the melanin material 14B 'and the end faces of the overhanging portions 14A.
It is also possible to introduce a prestress to the melanin material 14B 'by applying a compressive force P to the melanin material 14B' through the interposition of 2. In this case, after connecting both end portions of the melanin material 14B 'and the tip end portions of the respective overhanging erected portions 14A, both end portions of the melanin material 14B' and the respective overhanging erected portions 1 are connected.
Spacer S is interposed between the end surface of the front end of 4A and the end face, and the hydraulic jack 122 is provided after the completion of the space filling.
The prestress caused by should be released.

Next, an embodiment of the second invention of the present application will be described.

7 and 8 are views showing a process of constructing an arch portion of a concrete arch bridge by the bridge constructing method according to this embodiment.

The arch bridge which is the target of the bridge construction method according to this embodiment is the same as the arch bridge 10 (see FIG. 1).
However, the cross-linking environment is better than that of the above embodiment. However, even in this cross-linking environment, the shape of the ground surface 2 is melanin 14B '.
It is difficult to assemble the ground.

First, as shown in FIG. 7 (a), a pair of foundations 12 are installed on both sides of the bridge erection position.
The columns to be the bridge piers 16 are respectively installed on the column 2. Further, the back stay 104 is installed behind each of these columns 16.

Next, each foundation 12 using the Wagen 106
Concrete arch ribs 14A ′ are cantilevered along the arch axis, and the arch ribs 14A ′ are diagonally stretched from the columns 16 by diagonally extending cables 108.
By extending the arch ribs 14A ′ while supporting the above, the overhanging erected portion 14A is constructed. In addition,
Completion of both overhanging installation parts 14A is a stage of Drawing (c).

In parallel with this, a main cable 112 is stretched between the tips of both columns 16 so that the central portion thereof hangs down to near the ground surface 2, and a back cable 114 is stretched behind the column 16. A plurality of hanger cables 118 are installed on the main cable 112 at predetermined intervals.

Next, as shown in FIG.
After a pair of pedestals 124 are installed at predetermined intervals, the melan material constituting block 14b is hung and supported by a truck crane 126 and is suspended by the hanger ropes 118 located at both ends, and the melan material constituting block 14b is hung.
Lock to 4.

Then, as shown in FIG. 7C, the next melanin material building block 14 is moved by the truck crane 126.
Suspend and support b and hang it on the adjacent hanger rope 118,
Both melanin material building blocks 14b are connected to each other. Hereinafter, the direct hanging connection work of the melanin constituent block 14b is sequentially performed toward the center, and finally the melanin constituent block 14b suspended on the hanger rope 118 located in the center is connected to the melanin constituent blocks 14b on both sides thereof. By doing so, the melanin material 14B 'is assembled.

Subsequently, as shown in FIG. 6D, both ends of the melan material 14B 'are connected by a tide cable 120.

Next, as shown in FIG. 8 (e), the lower end of the step rod 128 hanging from the wagon 106 at the tip of the two overhanging parts 14A is connected to both ends of the melanin material 14B ', and at the same time, the tide is applied. An initial tension T1 is applied to the cable 120 to introduce a temporary prestress into the melanin material 14B '.

After that, as shown in FIG. 6F, the main cable 112, the back cable 114 and the hanger cable 1
18 is removed, and the melanin material 14B 'by the lift-up jacks 130 installed on each wagon 106.
Is slightly lifted and the gantry 124 is also removed. In this state,
The secondary tension T2 is applied to the tide cable 120 to introduce the desired prestress to the melanin material 14B '.

Next, as shown in FIG. 7G, the melanin material 14B 'is lifted up by the lift-up jack 130 to the extension of the bulging parts 14A (on the arch shaft). The step rod 128 is a rod formed by connecting steel rods of a predetermined length, and the steel rod located at the upper end can be sequentially removed each time a predetermined amount is lifted during the lifting.

After that, as shown in FIG. 6 (h), both ends of the melanin material 14B 'are connected to the tips of the overhanging portions 14A, and then the prestress by the tide cable 120 is released, and the tide cable 120 is removed. To remove.

Finally, by using the wagon 106, concrete is placed so as to embed the melanin material 14B ', thereby constructing the melanin installation portion 14B and completing the arch portion 14.

As described above in detail, in the bridge construction method according to this embodiment, the main rope cable 112 stretched between the pair of stanchions 16 erected on both sides of the bridge construction position is provided with a plurality of melanin materials. Since the melanin material block 14b 'is assembled by connecting the melanin material block 14b to each other in a state where the building block 14b is suspended and supported, the melanin material can be formed even in a bridging environment where it is difficult to assemble the melanin material. Assembly can be done.

Moreover, in this embodiment, the melanin material 1 is used.
Since the weight of 4B 'is entirely supported by the main cable 112, stress management at the time of assembling the melanin material 14B' is not required, and the workability is greatly improved as compared with the cantilever overhanging method.

In this embodiment, the melanin material 14 is used.
Since B'can be assembled in parallel with the construction of the overhanging erection portion 14A, the construction period can be significantly shortened as compared with the cantilever overhanging construction method.

Further, in this embodiment, the melanin material 14B is used.
Since the directly suspended erection equipment such as the main cable 112 and the hanger rope 118 used for assembling ′ can be diverted from those used in other bridge erection, the erection cost is higher than that of the cantilever erection method. Can be reduced.

As described above, according to the present embodiment, the arch portion can be erected even in a bridge environment where it is difficult to assemble the melanin material, and the workability is improved as compared with the cantilever overhanging construction method. It is possible to reduce the construction period and the construction cost.

Particularly in this embodiment, the melanin material 14 is used.
When assembling B ′, a plurality of melanin constituent blocks 14b are hung and supported by the main rope cable 112 stretched so that the central portion hangs down to near the ground surface 2, so that the assembled melanin 14B Although it is necessary to suspend ‘′ to the extension of both overhanging erection parts 14A, it is possible to secure a sufficient sag amount of the main rope cable 112, so the load of the direct erection installation equipment (required anchor force of the back cable 114). Etc.) can be significantly reduced, and it is not necessary to install the pyrone 102 on the upper end of the column 16 as in the above-described embodiment, and thus the construction cost can be significantly reduced. Further, since the truck crane 126 supported on the ground surface 2 can be used, workability is improved.

Further, also in this embodiment, the melanin material 1 is used.
Since the prestress is introduced into 4B ', the stress of the assembled melanin material 14B' can be easily controlled. Further, by connecting both ends of the melanin material 14B 'to the tip of each overhanging erection portion 14A in a state where the prestress is applied in this way, when concrete is subsequently poured to embed the melanin material 14B'. It is possible to sufficiently resist the tensile stress that occurs. As a result, it is possible to reduce the cross section of the melanin material 14B ', so that it is possible to reduce the construction cost due to the reduction of the weight of the steel material.

[Brief description of drawings]

FIG. 1 is a diagram showing a concrete arch bridge which is a target of a bridge construction method according to an embodiment of the first invention of the present application.

FIG. 2 is a diagram showing a process of constructing an arch portion by a bridge construction method according to an embodiment of the first invention of the present application.

FIG. 3 is a diagram showing how the melanin material is deformed by the introduction of prestress in the bridge construction method according to the embodiment of the first invention of the present application.

FIG. 4 is a detailed view of section IV in FIG.

FIG. 5 is a diagram showing how the melanin material is deformed by the introduction of prestress in the modification example of the bridge construction method according to the embodiment of the first invention of the present application.

FIG. 6 is a detailed view of VI part of FIG.

FIG. 7 is a view showing an arch erection process by a bridge erection method according to an embodiment of the second invention of the present application (No. 1)

FIG. 8 is a diagram showing an erection process of an arch portion by a bridge erection method according to an embodiment of the second invention of the present application (No. 2).

[Explanation of symbols]

2 ground surface 10 Concrete arch bridge 12 basics 14 Arch 14A Overhanging installation section 14A 'arch rib 14B Melan erection section 14B 'Mellan wood 14b Mellan material building block 16 Piers (posts) 18 Vertical material 20 Upper floor version 102 Pilon 104 backstay 106 Wagen 108 oblique suspension cable 110 cable crane 112 Main cable (cable) 114 back cable 116 career 118 Hanger rope 120 tide cable 122 hydraulic jack 124 mount 126 truck crane 128 step rod 130 lift up jack M mortar (early strong mortar) S spacer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Nakamura Reiji             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation (72) Inventor Hirokazu Hoashi             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation (72) Inventor Motofumi Saito             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation (72) Inventor Hiroshi Mashiko             4 Sumitomo Construction, 13 Araki-cho, Shinjuku-ku, Tokyo             Within the corporation (72) Inventor Tatsunori Yoneda             4610 Naeshima, Fukuno-cho, Tonami-gun, Toyama Prefecture Kawada Industry             Within the corporation F term (reference) 2D059 AA05 BB31 BB39 CC04 GG55

Claims (3)

[Claims] 1. A bridge erection method for constructing an arch portion of a concrete arch bridge by closing a pair of overhanging erection portions extending from both sides of the bridge erection position with a melan joint erection portion. A cable is stretched between a pair of upright columns, and a plurality of melanin material building blocks are hung and supported on the cable and arranged on the extension of both of the overhanging erection parts. The step of connecting and assembling the melanin material, the step of connecting both ends of the melanin material to the tip of each of the overhanging erection parts, and the concrete laid to embed the melanin material to construct the melanin erection part The method for constructing a bridge, comprising: 2. A bridge erection method for constructing an arch portion of a concrete arch bridge by closing a pair of overhanging erection portions extending from both sides of the bridge erection position with a melan joint erection portion. Between a pair of upright columns,
Assembling the melanin material by connecting the melanin material building blocks to each other while suspending and supporting the cable so that the center part hangs down to near the ground surface and suspending and supporting the plurality of melanin material building blocks on the cable. A step of connecting both end portions of the material with a tide cable, and a step of suspending and supporting both end portions of the melanin material from the tip end portion of each of the overhanging erection portions and lifting the melanin material up to an extension of the both erection overhanging portions. And a step of connecting both ends of the melanin material to the tip of each of the overhanging portions, and a step of placing concrete by embedding the melanin material to construct the melanin erection portion. How to build a bridge. 3. The prestress is introduced into the melanin material before connecting both ends of the melanin material to each of the overhanging erection parts, and the prestress is released after the connection is completed. The bridge construction method described in 1 or 2.