JPH08134845A - Erection method of bridge - Google Patents

Abstract

PURPOSE: To improve workability and profitability by devising a hanging type by a hanger regarding the erection method of a bridge by a method of hanger type span-by-span precast block construction. CONSTITUTION: Blocks 3 transported on a bridge girder 2 are hung up by a crab trolley 16, and transported up to a place determined by turning the direction at 90 deg. and suspended successively by a B hanger 26 and an A hanger 25 hung down from an erection girder 11 again. The blocks 3 within a range required for the turn of the direction are suspended temporarily from the A hanger 25 in height lower than specified installation height once. Regarding the A hanger, the intervals of hanging materials are made larger than width in the bridge axial direction of the blocks 3, and the directions of the blocks 3 can be rotated in spaces among the hanging materials. The blocks 3 in number required in a single span are hung down, and the block 3 suspended from the A hanger 25 is pulled up to specified height and positioned. A working scaffold 23 is used from the front column head section side, and an adhesive is applied, drawn near and joined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an improvement of a bridge erection method by a hanger type span-by-span precast block construction method in which bridge girder blocks manufactured in a factory or a yard are hung and erected on erection girders for each span. It is about.

[0002]

2. Description of the Related Art In the precast block method, a structure is manufactured by dividing it into a bridge axis direction or a direction perpendicular to the bridge axis at a factory or a manufacturing yard, and then the structure is carried into the erection site, and prestress is introduced to form an integrated structure. It is a construction method and is used for construction of bridges.

The following are some of the advantages of applying the precast block construction method to bridge construction.

Since the precast block can be manufactured and stocked during the construction of the substructure, the manufacturing process and the erection process can be set separately, and the construction period can be significantly shortened.

The production of the precast block is a repetitive operation in a factory or a production yard, and a structure having stable quality can be produced. Moreover, rationalization and labor saving can be achieved by performing mechanized construction.

By storing the blocks in the stockyard, drying shrinkage after installation and deformation due to creep are reduced.

From the above point of view, the precast block construction method is the construction method which is expected to be the most rapid construction and labor-saving construction in the field of PC bridge construction. The block erection is an advantageous construction method for large-scale bridge construction, assuming that the erection machine is large.

With respect to the introduction of prestress, there are many cases in which foreign cables are used in other countries, which improves workability and economy.

Further, as a typical erection method of the precast block construction method, it is manufactured in a factory or a yard.
The span-by-span construction method, in which blocks for spans are transported onto the erection girder, and after predetermined positioning, they are joined and erected one span at a time while prestressing, the balance is centered around the pier, There is a cantilever erection method in which blocks are alternately or simultaneously joined and overhanged while prestressing. The former is suitable for a PC girder bridge with a span of 40 to 60 m and the latter with a span of 60 to 100 m.

[0010]

The span-by-span precast block method, which is the subject of the present invention, relates to a method of supporting a block by a erection girder, including a support system for mounting the block on the erection girder and the erection girder. There is a hanger system that suspends and erects, the former is suitable when the main girder on the fulcrum (column head) is the precast block, and the latter is suitable for casting the main girder on the fulcrum in place.

In the span-by-span precast block construction method, the bridge girder block is first transported to a predetermined position on the bridge girder by a trailer or an automatic carrier on the bridge girder that has been erected.

In the case of the hanger system, a hanging device such as a club trolley that runs on the erection girder is used to lift the hanger system, and the garment is moved on the erection girder to the installation position in the bridge axis direction.

In this case, the precast block manufactured in the form of being divided in the bridge axis direction is conveyed laterally on the bridge girder, hoisted by the club trolley as it is, and passed through the rear leg as the supporting leg of the erection girder. The product is rotated 90 ° to be transported horizontally to the erected position of each block, and is suspended from the erected girder and suspended by a hanger. At this time, since it is difficult to horizontally move a large number of suspended blocks at the same time, the blocks are sequentially erected from the pier side ahead.

In this case, the section up to a certain extent can be turned by 90 degrees using the space on the front side while being supported by the suspension device, but the block on the front side is already in the erected position. Blocks, hangers, hangings, etc. that have reached reach obstacles, making it impossible or difficult to turn.

In order to deal with this, it is conceivable to suspend some blocks from the ground, but for that purpose, it is premised that the space under the bridge can be used.
In addition, it is uneconomical because it requires large machinery and equipment.

The present invention is intended to improve the workability and the economical efficiency by devising the suspension method by the hanger in the bridge erection method by such a span-by-span precast block method.

[0017]

DISCLOSURE OF THE INVENTION The present invention is a span of a hanger type in which a bridge girder block for one span manufactured in a factory or a yard is suspended from an existing bridge girder on a erection girder and erected for each span. In the bridge erection method by the bi-span precast block method, the blocks in the state of being rotated 90 degrees with respect to the bridge axis direction are sequentially hung by a hoisting device that runs along the erection girder, and turned 90 degrees in the predetermined turning position. Then, when moving to the erection position of each block and suspending it on the hanger supported by the erection girder via the suspending material, at least the section corresponding to the turning position of the block, the interval of the suspending material supporting the hanger Make the width more than the width in the bridge axis direction, and turn the block in the space between the hanging materials to In which was set to replace suspended in Nga.

In the section corresponding to the turning position of the block, the block suspended on the hanger is temporarily suspended below the bridge girder erection height, and after the required number of blocks are suspended on the hanger, the block is raised to the bridge girder erection height. If so, a sufficient space for turning the block can be secured, and the work becomes easy.

A roof device (canopy) is mounted on the erection girder.
By installing the above, not only can all-weather construction be possible, but the roof device can also be used for the purpose of curing the precast block. As such a roof device, for example, one in which rails are laid outside the erection girder and opened / closed in a bellows manner over the entire length of the construction span can be considered.

[0020]

EXAMPLES Next, the illustrated examples will be described. Note that the embodiment described below is merely an embodiment, and the present invention is not limited to the embodiment.

FIG. 1 shows an outline of the construction and machine construction in the hanger type span-by-span precast block construction method which is the subject of the present invention.

(1) The construction policy in this embodiment is as follows.

The construction span is about 40 to 60 m.

The weight of the block 3 alone is up to about 100 t.

[0025] The standard weight of the unit block 3 that can be installed is 30 t / m.

The erection girder 11 includes the front leg 3
2. It is supported by three legs of a launching leg 33 and a rear leg 34, and is installed in parallel and in a cross slope, a longitudinal slope and a plane alignment. In addition, these legs will be used to erect each single span by the hand-rolled girder system and move.

The block 3 is a trailer 2 on the completed bridge girder 2 from the block manufacturing yard to the erection point.
4 In principle, it should be transported using an automated guided vehicle. It is also possible to use a temporary road up to the erection point and to erect directly from below the erection point with the club trolley 16 of the erection girder 11.

As for the construction of the column head, both cast in place and precast block can be constructed.

(2) The mechanical structure of this embodiment is as follows.

The erection girder 11 is composed of two girders spanning two spans and supports the erection block 3. The upper part of the erection girder 11 is a club trolley 16
It is used as a road.

Club trolley 16 (suspension device) A crane for hoisting the block 3 from the carrier and moving it to the erection position, which can travel and traverse in the bridge axis direction.

Front leg 32 The front leg of the erected girder 11 is used for feeding, height adjustment,
There is a function of lateral movement.

Launching leg 33 With the leg in the middle part of the erection girder 11, the feeding, height adjustment,
There is a function of lateral movement.

Rear leg 34 This is the last leg of the erection girder 11 and has the functions of height adjustment and lateral movement, and is equipped with a traveling device that travels on the girder 2 that has been erected.

A hanger 25 A hanger for temporarily suspending the block 3 via the suspension beam 27, and the distance between the supporting points by the suspending member 28 is longer than the width of the block 3.

B hanger 26 The block 3 is positioned and erected by a standard hanger.

Working scaffold 23 (working stage) It is a scaffold for positioning and joining work of the block 3 and is movable along the erection girder 11. The work scaffold 23 can be separated into left and right parts at the center, and can be moved in a separated state.

(3) The erection work of the block 3 in this embodiment is performed as follows.

The first block 3 is sequentially moved to the erection position by using the club trolley 16, and a predetermined number of blocks 3 are hung on the B hanger 26 or the A hanger 25 at equal position intervals.

At this time, the block 3 suspended by the club trolley 16 needs to be transported in the bridge axis direction, turned 90 degrees at a predetermined position, and suspended by the hangers 25 and 26.

A predetermined number of blocks 3 are hung on the B hanger 26 while leaving a range necessary for turning in this direction, and a space necessary for turning all the blocks 3 in the remaining range is left (predetermined). Temporarily suspend it below the installation height) and hang it on the A hanger 25. After all the blocks 3 in this section are temporarily suspended on the A hanger 25, the blocks 3 of the A hanger 25 are positioned at a predetermined height and at intervals.

The A hanger 25 need not be used if the direction turning ranges within the erection range do not overlap, although it depends on the position of the packing portion and the length of the single diameter.

After the adhesive is applied to the blocks from above the work scaffold 23, the blocks 3 are sequentially drawn and joined by a drawing steel rod.

After the laying of the outer cable is completed, the stuffing portion is laid and tensioned to complete the construction of the single span.

(4) The erection girder 11 in this embodiment is moved as follows.

After the tension of the single span is completed, A hanger 25, B
The hanger 26 is stored, and the erection girder 11 is prepared for movement such as storage of the work scaffold 23.

The movement of the erection girder 11 is started by releasing the support of the launching leg 33 (pulling it up to a height where there is no curb during movement) and supporting the erection girder 11 by the front leg 32 and the rear leg 34.

The front leg 32 is fixed to the front pier 1 and is connected to the erection girder 11 via the moving device 32a. Also, the legs of the rear leg 34 are
It is a girder traveling device 34a (or a girder feeding device), and the erection girder 11 is supported by the upper part thereof.

While being supported by the rear leg 34 and the front leg 32, the traveling device 34a and the moving device 32a are driven to send out the erected girder 11.

After the launching leg 33 has been sent to the same position as the front leg 32 (the launching leg 33 can be moved to the position of the front leg 32 by the moving device 33a attached thereto, the balance of the erection girder 11,
Launching leg 33 while considering workability)
Is supported and fixed to the pier 1, the front leg 32 is released, and the front leg 32 is moved along the erection girder 11 to the position of the pier 1 in front.

(5) Next, the construction procedure in this embodiment is
2 (a) to 2 (d) and 3 (e) to 3 (h).

Start of erection of the block 3 (see FIG. 2 (a)) The erection starts from the side of the reference block 3c on the leading pier 1 previously erected by the mobile crane. The block 3 carried on the bridge girder 2 was lifted by the club trolley 16, turned 90 degrees, carried to a predetermined position, and then sequentially lowered at equal intervals from the hanger (the front section was Suspend to standard hanger B hanger 25).

Construction of Block 3 (See FIG. 2B) The block 3 in the range necessary for turning in the direction is temporarily hung on the A hanger 25 at a height lower than a predetermined installation height. The required number of blocks 3 in a single diameter is A hanger 25, B hanger 2
In the state where the block 3 is hung on 6, the blocks 3 hung on the A hanger 25 are lifted at a predetermined height and at equal intervals to be positioned. At the same time, the working scaffold 23 is used from the side of the front stigma to apply, draw, and join the adhesive.

Laying of the outer cable and tension (see FIG. 2 (c)) After the joining, drawing, and temporary tension of all the blocks 3 of the single span are completed, the filling concrete is applied. After that, the outer cable is laid and tensioned to complete the construction of the single span.

Preparation for moving the erection girder 11 (see FIG. 2
(See (d)) Rear leg 34, front leg 32 with erection girder 11
To release the anchor of the launching leg 33 and bring it into a slightly floating state. Fix the club trolley 16 at the same time,
The hangers 25 and 26 are stored and fixed, and the work scaffold 23 is prepared for movement.

Sending out the erection girder 11 (see FIG.
(See (e)) The erection girder 11 is sent out by using the traveling device 34a (see FIG. 1) mounted on the leg of the rear leg 34. The leg portion of the front leg 32 is fixed to the pier 1 by an anchor, and the joint portion between the front leg 32 and the erection girder 11 is via a moving device 32a. The erection girder 11 moves forward using the moving device 32a as a guide.

Positioning adjustment of the erection girder 11 (see FIG. 3 (f)) The delivery of the erection girder 11, the front leg 32 and the launching leg 33 are located on the same pier 1, and the tip part of the erection girder 11 is the next pier. After reaching the position 1, the erection girder 11 is positioned and adjusted and temporarily fixed.

Fixing the erection girder 11 (see FIG. 3 (g)) The front leg 32 and the launching leg 33 on the pier 1 are exchanged for support. After placing the launching leg 33 on the reference block 3a on the pier 1 and fixing it, the front leg 3
Release 2. The moving device 32a of the front leg 32 is driven and fixed at the position of the pier 1 on the front side.

Preparation for erection of block 3 (see FIG. 3 (h)) After the movement of the erection girder 11 is completed, centering, fine adjustment and positioning are performed and fixed. After inspecting and adjusting each part, prepare for building block 3.

[0060]

EFFECT OF THE INVENTION The present invention is a method of erection of a bridge by a span-by-span precast block construction method of a hanger system, which is sequentially hoisted by a hoisting device which runs along a hoisting girder, and is turned by 90 degrees at a predetermined turning position,
When moving to the erection position of each block and suspending it on the hanger supported by the erection girder through the suspending material, at least the section that corresponds to the turning position of the block, use the hanger with a wider suspension interval to move the block. It is designed so that the direction can be turned in the space between the hanging materials, and in principle the erection work can be performed only on the girder.

Therefore, even if a space for installing a mobile crane or the like cannot be provided under the bridge, a large-scale bridge can be constructed by the precast block method.

In the section corresponding to the turning position of the block, the block suspended on the hanger is temporarily suspended below the bridge girder erection height, the required number of blocks are suspended on the hanger, and then the block is raised to the bridge girder erection height. If so, a sufficient space for turning the block can be secured, and the work becomes easy.

[Brief description of drawings]

FIG. 1 shows an outline of a hanger type span-by-span precast block construction method, which is the subject of the present invention, in which (a) is a side view of a bridge being erected, (b) is a sectional view taken along line AA, (c) is a sectional view taken along line BB, (d) is a sectional view taken along line CC,
(e) is a DD sectional view.

2 (a) to 2 (d) are side views showing a construction procedure in an embodiment of a span-by-span precast block construction method of a support system which is an object of the present invention.

3 (e) to (h) are side views showing a construction procedure following FIG. 2 (d).

[Explanation of symbols]

1 ... Bridge pier, 2 ... Bridge girder, 3 ... Block, 3c ... Standard block, 11 ... Erection girder, 16 ... Club trolley, 23
… Work scaffolding, 24… Trailer, 25… A hanger, 2
6 ... B hanger, 27 ... hanging beam, 28 ... hanging material, 32
… Front leg, 33… Launching leg, 34… Rear leg

Claims (2)

[Claims] 1. A bridge using a hanger type span-by-span precast block method in which a bridge girder block for one span manufactured in a factory or a yard is hung from an existing bridge girder on a erection girder and erected one span at a time. In the erection method, blocks in a state of being rotated by 90 degrees with respect to the bridge axis direction are sequentially hung by a hanging device that runs along the erection girder, and are laid at 90 degrees in a predetermined turning position to lay each block. When moving to a position and suspending the hanger supported by the erection girder through a suspending member, at least for the section corresponding to the turning position, the interval of the suspending member supporting the hanger is not less than the width of the block in the bridge axis direction. Then, the blocks are turned around in the space between the suspension members and suspended on the hangers at the installation position of each block. A method of constructing a bridge characterized by the following. 2. Regarding the section corresponding to the turning position,
The bridge erection method according to claim 1, wherein the block suspended on the hanger is temporarily suspended to a height below the bridge girder erection height, a required number of blocks are suspended on the hanger, and then raised to the bridge girder erection height.