JPH0376366B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuous bridge construction method for continuously constructing piers, pier column heads, and bridge girders, and an apparatus used therefor.

[Prior art and its problems]

Traditionally, large panel construction methods, jumping form construction methods, sliding foam construction methods, etc. have been adopted to construct bridge piers. This construction method makes it possible to construct the entire pier by gradually raising the formwork without using a large number of formwork.

However, construction could not be carried out continuously from the pier to the head of the pier, and furthermore to the bridge girder, so after supporting the formwork of the pier column head using brackets, the formwork of the bridge girder was supported using a wager. . Therefore, the equipment for constructing the piers and the equipment for constructing other parts had to be separate, resulting in problems of increased construction costs and longer construction periods.

[Means for solving problems]

The continuous construction method for a bridge according to the present invention includes a main frame that can be bent at least at one point in the longitudinal direction, a rail member, and a formwork held by the rail member, on two opposing sides of a bridge pier in a direction perpendicular to the bridge axis. A movable formwork device equipped with is installed, and concrete is poured using both movable formwork devices installed on the two sides as formwork for the front and rear surfaces of the pier, and the main frame and rail members are anchored to the existing concrete surface in sequence. death,
Concreting work on the pier is carried out while moving the movable formwork device upwards by exerting a reaction force on the other, and when it reaches the head of the pier column, the main frame is bent and the movable formwork device is moved from the column head to the bridge girder. The main frame and rail members are successively anchored to the existing concrete surface, and the movable formwork device is moved in the direction of the bridge axis by taking reaction force from each other, and the bridge girder is constructed. Concrete work will be carried out continuously.

In addition, the bridge movable formwork device used in the above bridge continuous construction method consists of a main frame that can be bent at least at one point in the longitudinal direction, a rail member, and a formwork held by the rail member, each of which is constructed of concrete that is attached to the existing concrete. The main frame and the rail member, which are anchored to the surface, can move up and down and move horizontally by exerting a reaction force on each other.

〔Example〕

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

In the figure, A is a movable formwork apparatus according to the present invention, which is composed of main frames 1, 1, rail members 2, 2, and a formwork 3 held by the rail members 2, 2.

The rail members 2, 2 are made of I-shaped steel, arranged in parallel on the left and right, and connected at the top and bottom by two cross beams 4, 4 made of C-shaped steel, and are framed in a rectangular shape.

Two steel rods 11, 11 are spanned between the upper and lower cross beams 4, 4 in parallel with the rail members 2, 2 and spaced apart appropriately.

Two movable members 6 having wheels 5 are attached to each rail member 2 at appropriate intervals vertically so as to be movable along the rail member 2. Beam members 7, 7 made of C-shaped steel, with moving members 6, 6 attached to the left and right rail members 2, 2 fixed to the upper and lower surfaces, respectively.
connected by.

A rectangular connecting frame 8 is arranged between the upper and lower beam members 7, 7. Left and right rail members 2,
A moving cylinder 9 attached to a connecting frame 8 is provided between the two.
are arranged parallel to the rail members 2, 2. A pressure receiving member 10 is attached to the rod tip of the moving cylinder 9.

The main frames 1, 1 are two first main frames 1a, 1a and a second main frame 1b, 1b.
It consists of a first main frame 1a, 1
a and the second main frames 1b, 1b are bendably connected. That is, the first mainframe 1
Bracket 12,1 fixed to the end of a,1a
The second main frames 1b, 1b are connected to the second main frame 2 by a pin pivot, and are bendable.

The first main frames 1a, 1a are arranged within the connection frame 8 in parallel with the rail members 2, 2. The first main frame 1a, 1a has a connecting frame 8
Locking pieces 13, 13 are provided on the upper side and project laterally, thereby locking the first main frame 1.
a, 1a are connecting frame 8, beam members 7, 7 moving members 6,
It is movable along the rail members 2, 2 together with 6. An adjustment cylinder 26 that expands and contracts in a direction perpendicular to the rail members 2, 2 is interposed and connected between the first main frames 1a, 1a and the beam members 7, 7. By expanding and contracting the adjustment cylinder 26, the rail members 2, 2 and the first main frame 1a,
The spacing between 1a can be adjusted.

Anchor fixing members 14, 14 and cylinders 15, 15 are fixed to the second main frames 1b, 1b.

On the opposite side of the first main frames 1a, 1a from the rail members 2, 2, a projecting portion 16 made of H-shaped steel and C-shaped steel is assembled in a letter shape. An angle adjustment cylinder 27 is connected to the second main frames 1b, 1b by a pin, and the tip of the rod is pivotally supported by the projecting portion 16. Furthermore, the second main frame 1b,
A support member 17 made of H-shaped steel is removably spanned between 1b and the projecting portion 16.

Remove the support member 17 and remove the angle adjustment cylinder 27.
The angles of the first main frames 1a, 1a and the second main frames 1b, 1b can be adjusted by expanding and contracting. By changing the length of the support member 17, the first main frames 1a, 1a and the second main frames 1b, 1b are fixed at a predetermined angle.

FIGS. 7 to 11 show how to raise the movable formwork device having the above-described configuration.

The moving cylinder 9 is extended, and the nuts 18, 18 attached to the steel rods 11, 11 are brought into contact with the upper surface of the pressure receiving member 10 at the tip of the rod. (FIG. 7) The moving cylinder 9 is retracted, and the rail members 2, 2 are pulled up together with the steel rods 11, 11.
(FIG. 8) Nuts 18, 18 attached to steel bars 11, 11 are supported by the connecting frame 8 so as to abut against the upper surface of the connecting frame 8 so that the rail members 2, 2 do not fall. (9th
Figure) Extend cylinder 9. (FIG. 10) Nuts 18, 18 attached to the steel rods 11, 11 are brought into contact with the upper surface of the pressure receiving member 10 at the tip of the rod of the movable cylinder 9. After the rail members 2, 2 are further raised by repeating the operations shown in FIGS. 8 to 10, the rail members 2, 2 are fixed with anchors 19, 19. (Fig. 11) To raise the main frames 1, 1, the nuts 18, 18 are brought into contact with the lower surface of the pressure receiving member 10 at the tip of the rod of the moving cylinder 9, and the rail members 2, 18 are extended.
Mainframes 1 and 1 rise relative to 2.

The continuous construction method of a bridge according to the present invention, which is carried out using the above-mentioned movable formwork apparatus, will be explained for each construction order.

<1> Installation of the movable formwork device (FIG. 12) The movable formwork device A is installed on the footing 20. The mobile formwork device A is the second main frame 1
b, 1b are approximately parallel to the surface of the footing 20,
Anchors 19, 19 buried in footing 20
are fixed to the second main frames 1b, 1b anchor fixing members 14, 14. The cylinders 15, 15 fixed to the second main frames 1b, 1b are extended to fix the second main frames 1b, 1b.

The first main frames 1a, 1a are erected substantially vertically, and the rail members 2, 2 are erected substantially vertically. The formwork 3 is held by the rail members 2, 2.

Two movable formwork devices A as described above are installed facing each other on the left and right sides.

Formwork 3, 3 held by mobile formwork device A
The frame molds 3, 3 in the direction intersecting with are suspended from hanging members 21 that span the movable formwork devices A, A facing each other, as shown in FIG.

<2> Construction of the pier As described above, concrete 22 is poured in the space surrounded by the formwork 3 and the pier is constructed.

After the concrete 22 has hardened, the formwork 3 is raised. The rail members 2, 2 are fixed to anchors 19 buried in the existing concrete 22 via supporting members 23, and the formwork 3 is supported. (Fig. 14) As described above, pouring of concrete 22 is repeated while raising formwork 3. (Fig. 15) <3> Raising the main frame The main frames 1, 1 are raised along the rail members 2, 2. First mainframe 1
a, 1a and the second main frames 1b, 1b are made substantially straight, and the anchor fixing members 14, 14 of the second main frame are fixed to the anchors 19, 19 buried in the existing concrete 22, and the main frames 1, 1 are made into piers. Fixed against. (1st
(Figure 6) The main frames 1, 1 support the rail members 2, 2 while rising. The increase is as described above. (Fig. 17) After that, the pier is constructed while the main frames 1, 1 and the rail members 2, 2 are raised alternately.
(Fig. 18) As shown in Fig. 19, the movable formwork devices A and A facing left and right are connected by a frame 28 that connects the outer periphery of the rail members 2, 2 so as to surround the pier. be. (FIG. 19) In addition, as shown in FIG. 20, scaffolding 24 is erected in the movable formwork devices A and A to attach, detach, and transport the formwork 3.

<4> Construction of the bridge head (Figs. 21 to 23) Retract the angle adjustment cylinder 27, bend the first main frames 1a, 1a relative to the second main frames 1b, 1b, and then 1
Make a and 1a approximately horizontal. The angle between the rail members 2, 2 and the formwork 3 is adjusted by expanding and contracting the adjustment cylinder 26.

The formwork 3 is positioned closest to the pier and concrete 22 is poured to construct the bridge head.

<5> Construction of bridge girders (Figures 24 to 28) Move the formwork 3 along the rail members 2, 2,
Build bridge girders in succession. The formwork 3' spans between the scaffolding 24 assembled on the main frame 1 and the existing concrete 22. (Fig. 25) After the formwork 3 is moved to construct a bridge girder of a predetermined length, the main frames 1, 1 are moved and fixed with anchors 19, and the rail members 2, 2 are moved forward again. (Fig. 27) When constructing a bridge girder, as shown in Figs. 29 and 30, the ends of the rail members 2, 2 or the main frames 1, 1 are fixed to the ends of diagonal steel bars 25 taken from the existing concrete 22. You can support it.

〔Effect of the invention〕

The present invention has the above configuration and can obtain the following effects.

B According to the continuous bridge construction method according to the present invention, the piers, column heads, and bridge girders are constructed continuously using only the movable formwork device, so there is no need to replace the device or transport it to the site. This is unnecessary, shortens the construction period and reduces construction costs.

(b) With the movable formwork device according to the present invention, when moving from construction of piers to column heads, the main frame can be bent and the formwork held by rail members can be continuously constructed approximately horizontally. .

[Brief explanation of drawings]

Fig. 1 is a side view of an embodiment of the continuous bridge construction method according to the present invention, Fig. 2 is a perspective view of a movable formwork device according to the invention, Fig. 3 is a plan view thereof, and Fig. 4 is its A partial side view, FIG. 5 is a front view thereof, FIG. 6 is a sectional view thereof, FIGS. Fig. 28 is a side view of the construction order, Fig. 19 is a side view of the pier construction state, Fig. 20 is its plan view, Fig. 29 is a side view of other embodiments, Fig. 30
The figure is its front view. A... Mobile formwork device, 1... Main frame, 1a
...first main frame, 1b...second main frame, 2...rail member, 3...formwork, 6...movable member,
7... Beam member, 8... Connection frame, 9... Moving cylinder, 1
0...Pressure receiving member, 11...Steel rod, 14...Anchor fixing member, 15...Cylinder, 16...Protrusion part, 17
...Supporting member, 18...Nut, 19...Anchor, 2
2...Concrete, 24...Scaffolding, 26...Adjustment cylinder, 27...Angle adjustment cylinder.

Claims (1)

[Claims] 1. A movable structure that includes a main frame that can be bent at at least one point in the longitudinal direction, a rail member, and a formwork held by the rail member on two opposing sides of the pier in the direction perpendicular to the bridge axis. A formwork device is installed, and concrete is poured using both movable formwork devices installed on the two sides as formwork for the front and rear surfaces of the pier, and the main frame and rail members are anchored to the existing concrete surface one after another, and each Concreting work on the pier is carried out while moving the movable formwork device upward using the reaction force, and when it reaches the head of the pier column, bend the main frame and move the movable formwork device from the column head to the bridge girder. Concrete is poured as a formwork, the main frame and rail members are anchored to the existing concrete surface one after another, and concrete work for the bridge girder is carried out while moving the movable formwork device in the direction of the bridge axis by taking reaction forces from each other. A continuous construction method for bridges, which is characterized by carrying out continuous construction of bridges. 2. The method for continuous construction of a bridge according to claim 1, wherein during construction of a bridge pier, the formwork on the side of the pier is placed between both movable formwork devices and concrete is poured. 3. The continuous construction method for a bridge according to claim 1 or 2, in which when constructing the bridge girder from the head of the pier column, the formwork for the side of the bridge girder is attached to a movable formwork device and concrete is poured. 4. Consisting of a main frame that can be bent at at least one point in the longitudinal direction, a rail member, and a formwork held by the rail member, the main frame and the rail member, each of which is anchored to an existing concrete surface, are attached to the other. A movable formwork device for a bridge, which is capable of lifting, lowering, and horizontally moving by absorbing reaction force. 5. The movable formwork device for a bridge according to claim 4, wherein the main frame is made bendable by connecting two bendable members by pin connection via a hydraulic jack. 6. The movable formwork device for a bridge according to claim 4 or 5, wherein the main frame is provided with a work scaffold.