JPH09111718A - Assembling method of reinforcing frame for bridge pier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the safety of work and the accuracy of execution and reduce the construction period and cost by oppositely installing reinforcing frames at both sides of a bridge pier column and erecting both reinforcing frames by use of pulleys and a winch and connecting them together. SOLUTION: The ground at the root of a bridge pier column 1 is partly excavated to expose the foundation 4. Reinforcing frames 2, 2 are installed slantwise opposite to each other at both sides of the column 1 so that the lower ends of the reinforcing frames 2 surround the bridge pier column 1. A connecting device 6 for the reinforcing frames is fitted by pins 6a, 6a at both lower ends of the frames 2, 2 and an assembling device 7 of the reinforcing frame is fixed at the rear face of the upper part of the reinforcing frames 2, 2. Subsequently, wires 8 are wound up on pulleys 7b of the assembling device 7 of the reinforcing frames many times. And one end thereof is connected to a winch 9 and the other end is fixed at the position P of the opposite side to the winch 9, against the reinforcing frame 2. And then, the wire 8 is wound up by the winch 9. Both reinforcing frames 2, 2 are turned upward around the pins 6a and erected on the ground and then they are positioned to butt each other and connected together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of assembling a reinforcing frame for a pier supporting a concrete and steel viaduct.

[0002]

2. Description of the Related Art In order to reinforce columns supporting concrete and steel viaducts, a steel plate is wound around the columns to form a reinforcing frame. As a method of assembling this reinforcing frame, conventionally, as shown in FIG. 1, a U-shaped reinforcing frame 2 made of steel, FRP, etc., which has been brought into the field, is hung by a crane or the like and built on the side surface of the pier column 1. A method is used in which the reinforcing frames are connected to each other by welding, bolts or the like using a splicing plate after being temporarily fixed to an anchor bolt, welding, temporary fixing metal fitting or the like and installed at a predetermined position.

[0003]

However, in this method,
First, in order to assemble the reinforcing frame member, as shown in FIG. 2, a scaffold for an assembly worker is required. It must also be arranged so as not to interfere with crane work. 2A is a perspective view of the scaffold, FIG. 2B is a side view, and FIG. 2C is a plan view. In this way, the scaffolding is provided around the reinforcement frame, but since the reinforcement frame member is fairly heavy, it is necessary to have something that can withstand considerable strength, and the height of the scaffolding will also be considerable. There is also the possibility of an occupational accident such as a crash. In addition, it is necessary to join the reinforcing frame members to each other by welding or bolts in order to form an integral structure, and this involves the work of abutting the reinforcing frame members at predetermined positions. Then, as shown in FIG. 3, the splicing plate 3 must be installed with a predetermined accuracy in consideration of the position of the reinforcing frame member. Further, unless the installed splicing plate 3 and the reinforcing frame 2 are welded with the welding rod 5 or joined with a bolt or the like, the reinforcing frame members are not completely integrated with each other. When connecting by welding through the joint of the splicing plate, it is necessary to bring the member and the joint of the splicing plate into close contact with each other for welding, which requires a great deal of time and cost. A considerable degree of accuracy is required for construction when installing and assembling such a reinforcing frame. However, in the current situation where skilled workers are decreasing, it is very difficult to obtain the construction accuracy, and the construction cost is increasing. Therefore, there is a demand for a construction method that can improve work safety, construction accuracy, and cost reduction by shortening the construction period.

The present invention is intended to solve the above problems, and it is intended to improve work safety, improve construction accuracy, shorten construction period,
It is an object of the present invention to provide a method for assembling a pier reinforcement frame that can reduce costs.

[0005]

According to the method of assembling a pier reinforcement frame of the present invention, a step of installing the reinforcement frame on both sides of the pier facing the ground and attaching a connecting device for connecting the reinforcement frames to the lower end of the reinforcement frame. , The steps of attaching an assembling device with pulleys to the top of each reinforcing frame and winding the wires around each other, and winding up the wires with a winding device to bring the reinforcing frames together, butting them together, and connecting them. There is. As described above, the assembling method of the present invention has a different concept from the conventional member hanging and assembling method, and the reinforcing frame member can be built and assembled only by the ground work, and the members can be accurately abutted against each other. . And a concave joint in the opposing reinforcing frame,
By providing the convex joint, the connection between the reinforcing frame members is completed at the same time as the assembly, and the reinforcing frame member and the joint can be integrated.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. First, an example of the reinforcing frame used in the present invention will be described with reference to FIG. In FIG. 4A, the joint 1
Reference numeral 0 denotes a U-shaped cross section, which is a recessed joint made of steel having hooking projections 10a and 10b protruding inward at an acute angle or a right angle in the opening, and the steel plate 2 is welded or joined by bolts or the like. Further, the joint 20 has, at its tip, a protruding protrusion 20 that engages with the catch protrusions 10a and 10b.
It is a convex joint made of a steel material having a and 20b, in which the steel plate 2 is welded or joined by bolts or the like, and the joint is in an overhanging state. Joints 10 and 2 in which these steel plates 2 are joined
0 is manufactured in advance at the factory. The steel plate manufactured in the factory and having the concave joint 10 and the convex joint 20 joined thereto is made to face each other so as to surround the pier 1 by a work vehicle such as a crane truck at the site, and as shown in FIG. The joint 20 joined to is inserted through the opening of the joint 10 in the joint axial direction. At the time of insertion, the opening of the joint 10 is expanded by the spring action of the joint 10 and the joint 20 is inserted. When the joint 20 is completely inserted into the joint 10, the opening is restored by the spring action. When the insertion is completed in this way, the catch protrusion 10a of the joint 10
10b and the projecting protrusions 20a and 20b of the joint 20 are caught and do not come out even if a force for separating them acts. Thereby, the steel plates are butted against each other and connected.

FIG. 5 is a view showing one embodiment of the method for assembling a reinforcing frame according to the present invention. FIG. 5 (a) is a front view and FIG.
(B) is a plan sectional view. In FIG. 5, 1 is a pier pillar that supports a concrete viaduct, 2 is a reinforcing frame made of steel or the like, 4 is a foundation of the pier pillar, G is the ground, 6 is a connecting device for connecting the reinforcing frames to each other, and 6a is a reinforcing frame. Pins for attaching the connecting device to the device, 7 are reinforcing frame assembling devices for raising the reinforcing frame, 7a is a jig, 7b is a pulley, 8 is a wire, and 9 is a hoisting device for hoisting the wire. The reinforcing frame used has a U-shaped cross section provided with a joint as described with reference to FIG.
As shown in, the soil of the root portion of the pier pillar 1 is partially excavated to expose the foundation 4, and the reinforcing frame 2 is installed so as to face the both sides of the pier pillar 1 so that the lower end portion of the foundation frame 2 is inclined.

Next, a connecting device 6 made of steel, wood or the like for connecting the reinforcing frames to each other is attached to the lower ends of both reinforcing frames by means of pins 6a. Then, on the upper back surface of each reinforcing frame 2,
A reinforcing frame assembling device 7 for mounting the reinforcing frame is attached. The reinforcing frame assembling device 7 includes a jig 7a and a jig 7a.
It consists of a pulley 7b attached to a. The jig 7a is provided so that a relatively thin reinforcing frame steel plate is not bent due to the load applied to the pulley. A hole is formed in the reinforcing frame in advance and the jig 7a is attached to the hole with a bolt or the like or is reinforced. A hook may be provided on the frame, and a jig may be hooked on the frame to attach the hook to the frame.

Next, the wires 8 are wound around the pulleys of both reinforcing frames installed on both sides of the pier and wound a plurality of times, one end of which is connected to the winding device 9 and the other end is wound around the reinforcing frame. It is fixed at the position P on the opposite side. In addition, by winding the wire multiple times between the pulleys,
Since the load per wire can be reduced and a thin wire can be used, handling becomes convenient.

Then, the winding device 9 winds the wire 8. Since the reinforcing frame 2 is placed so as to be inclined so that the upper end portion is higher than the lower end portion, when the pulleys are pulled so that the pulleys come close to each other by winding the wire,
It rotates around the pin 6a and stands up from the ground. During this rising process, the convex joint and the concave joint shown in FIG. 4 are gradually joined from the lower end portion toward the upper end portion, and when the rising end is completed, the connection is completed. In addition, in the process of joining the joint, the place where the convex joint is inserted into the concave joint moves sequentially from the lower side to the upper side, and there are some places where friction is generated for insertion, so It requires less power. Further, the play between the joints is increased to facilitate the joining, and after the joining, as shown in FIG. 6, a force is applied to separate the reinforcing frames from each other by using the bolts 30 or the like to play the joints. If it is eliminated, the joining can be facilitated and a firm joining can be obtained. Also, after connecting, insert a wedge or the like between the reinforcing frame 2 and the foundation 4 to form the pin 6a.
And the reinforcement frame is directly received by the foundation 4. Thus, the assembly can be done with simple equipment without the need for scaffolding and without the use of cranes or the like.

FIG. 7 is a diagram for explaining another embodiment of the present invention. 7, the same numbers as in FIG. 6 indicate the same contents. The method shown in FIG.
6 is the same as that of FIG. 6 except that is used. In FIG. 6, the base portion of the pier is excavated to form a depression, and the reinforcing frame end is placed in this portion so that the reinforcing frame is inclined and installed. Therefore, the reinforcing frame is set up by winding the wire. It is possible to raise. But, for example,
In a viaduct having a two-layer structure or a three-layer structure, when the reinforcing frame is installed in the second stage, the third stage, etc., it cannot be installed by inclining. The reinforcing frame is installed horizontally, and the wire passing the wire is also stretched horizontally by the method shown in FIG. 6. Even if the wire is wound up, the reinforcing frames only try to approach each other and the reinforcing frame does not stand up.

Therefore, in FIG. 7, the reinforcing frame is installed, the reinforcing frames are connected to each other by the connecting device 6, and the assembly device 7 in which the pulley is attached is attached to the upper part of the reinforcing frame.
The start-up assisting device 40 is installed at the position of the connecting device 6, and the wire 8 stretched between the assembling devices is set up.
Place it on the top of the wire so that the center of the wire is higher than both ends. In addition, the part on which the wire of the start-up assistance device rests
Since the wire moves in both directions, the surface should be smooth so that the wire can move.

When the winding device 9 winds the wire in this state, a vertical component force acts on the pulley from the wire, and the reinforcing frame starts to rise. Once stood up, as in FIG. 7, the pulleys are pulled by the winding of the wire so that the pulleys approach each other, and
Rotating about a, it rises, and in the process of this rising, the convex joint and the concave joint shown in FIG. 4 are gradually joined from the lower end toward the upper end, and when the rising ends, they are connected. Is completed.

FIG. 8 shows a state in which they are connected in this way. A space between the pier column 1 and the steel plate 2 is filled with a filler such as epoxy resin or mortar, and the reinforcement work is completed. In the above description, the reinforcing frame is described as an example having a convex joint and a concave joint, but the present invention is not limited to this. It can also be applied when connecting by welding or welding.

[0015]

As described above, according to the present invention, the reinforcing frame member can be installed within a predetermined accuracy at the same time as it is built and assembled.
Also, most of the work is done on the ground, so a work scaffold is not required, and it is possible to prevent the occurrence of work-related accidents such as the fall and fall of workers. Further, since a scaffold is not required, the construction cost can be significantly reduced, and further, by providing the joint device on the reinforcing frame, the construction period can be significantly shortened.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a conventional method for assembling a pier reinforcement frame.

FIG. 2 is a view showing a scaffold used in a conventional assembly method.

FIG. 3 is a diagram illustrating a conventional method of reinforcing a pier.

FIG. 4 is a diagram showing an example of a reinforcing frame used in the present invention.

FIG. 5 is a diagram showing an example of a method for assembling a reinforcing frame according to the present invention.

FIG. 6 is a diagram illustrating a method of assembling a reinforcing frame according to the present invention.

FIG. 7 is a diagram showing another example of the reinforcing frame assembling method according to the present invention.

FIG. 8 is a diagram showing a connected state.

[Explanation of symbols]

1 ... Bridge pier, 2 ... Reinforcement frame, 4 ... Foundation, 6 ... Coupling device, 6
a ... Pin, 7 ... Reinforcing frame assembly device, 7a ... Jig, 7b
... pulley, 8 ... wire, 9 ... hoisting device, 30 ... bolt, 40 ... start-up assisting device.

Claims (5)

[Claims] 1. A step of installing the reinforcing frames on opposite sides of the pier, a step of attaching a connecting device for connecting the reinforcing frames to each other at the lower end of the installed reinforcing frames, and an assembling apparatus having pulleys on the upper parts of the reinforcing frames. Attaching and winding the wire around the pulleys, by winding the wire with the winding device, the reinforcing frames are started up and abutted,
The method of assembling the pier reinforcement frame, which consists of connecting them. 2. The method according to claim 1, wherein the start-up assisting device is arranged at the position of the connecting device, and the wires between the pulleys are placed on the start-up assisting device. Method. 3. The method according to claim 1, wherein
A method for assembling a pier reinforcement frame, characterized in that a reinforcement frame provided with a convex joint and a reinforcement frame provided with a concave joint are used so that the connection is completed at the same time when the bridge is started up. 4. The method for assembling a pier reinforcement frame according to claim 3, wherein after connecting the reinforcement frames, a force is applied in a direction in which both the reinforcement frames are separated from each other. 5. The method according to claim 1 or 2, wherein
The assembling device attached to the upper part of the reinforcement frame is a method for assembling the pier reinforcement frame, characterized in that a pulley is attached to the jig.