JP3606535B2 - Assembling method of pier reinforcement frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for assembling a reinforcement frame of a pier column supporting concrete and steel viaducts.
[0002]
[Prior art]
In order to reinforce pillars that support concrete and steel viaducts, steel frames are wound around pillars to form reinforcing frames. As a method of assembling this reinforcing frame, conventionally, as shown in FIG. 1, a U-shaped reinforcing frame 2 made of steel, FRP or the like carried on-site is suspended by a crane or the like and built on the side surface of the pier column 1 In other words, a method is used in which the reinforcing frames are connected to each other by welding, bolts, or the like using an attachment plate after being temporarily fixed to anchor bolts, welding, temporary fixing metal fittings, and the like and installed at predetermined positions.
[0003]
[Problems to be solved by the invention]
However, in this method, 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 the crane operation. 2A is a perspective view of the scaffold, FIG. 2B is a side view, and FIG. 2C is a plan view. As described above, the scaffolding is provided around the reinforcement frame. However, since the reinforcement frame member has a considerable weight, it needs to be able to withstand a considerable strength, and the height of the scaffolding also becomes a considerable height. There is also the possibility of occupational accidents such as crashes. In addition, in order to connect the reinforcing frame members to form an integral structure, it is necessary to join them by welding, bolts, or the like. In addition, as shown in FIG. 3, the attachment plate 3 must be installed with a predetermined accuracy in consideration of the position of the reinforcing frame member. Furthermore, if the installed attachment plate 3 and the reinforcing frame 2 are not welded with the welding rod 5 or joined with bolts or the like, the reinforcing frame members are not completely integrated. When connecting by welding via a joint of an attachment plate, welding must be performed by bringing the member and the joint of the attachment plate into close contact with each other, which requires a great deal of time and cost. When installing and assembling such a reinforcing frame, considerable accuracy is required during construction. However, in the current situation where the number of skilled workers is decreasing, it is very difficult to obtain construction accuracy, and the construction cost tends to increase. For this reason, there is a demand for a construction method capable of reducing costs by improving work safety, improving construction accuracy, shortening the construction period, and the like.
[0004]
An object of the present invention is to provide a method for assembling a pier reinforcement frame capable of improving work safety, improving construction accuracy, shortening a construction period, and reducing costs.
[0005]
[Means for Solving the Problems]
The method of assembling the pier reinforcement frame according to the present invention includes the steps of installing the reinforcement frame opposite to the ground on both sides of the pier column, attaching a connecting device for connecting the reinforcement frames to the lower end of the reinforcement frame, and installing a pulley on each reinforcement frame. A step of attaching the provided assembly device and winding the wire between the pulleys, and a step of winding up the wire by the winding device to bring up the reinforcing frames to face each other and connect them. Thus, the assembling method of the present invention is different in concept from the conventional member hanging assembling method, and the reinforcement frame member can be built and assembled only by ground work, and the members can be abutted with each other with high accuracy. . By providing the concave joint and the convex joint on the opposing reinforcing frame, the connection between the reinforcing frame members is completed simultaneously with the assembly, and the reinforcing frame member and the joint can be integrated.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention are described below.
First, an example of a reinforcing frame used in the present invention will be described with reference to FIG.
In FIG. 4 (a), the joint 10 is a concave joint made of a steel material having a U-shaped cross section and having hook projections 10a and 10b projecting at an acute angle or a right angle inside the opening. It is joined with bolts. The joint 20 is a convex joint made of a steel material having protruding protrusions 20a and 20b that engage with the hook protrusions 10a and 10b at the tip, and the steel plate 2 is joined by welding, bolts, etc. It is in the state. The joints 10 and 20 to which the steel plates 2 are joined are manufactured in advance at the factory. The steel plates manufactured at the factory and joined with the concave joint 10 and the convex joint 20 are opposed to each other so as to surround the pier column 1 with a work vehicle such as a crane truck on the site, and as shown in FIG. Is inserted in the joint axial direction through the opening of the joint 10. At the time of insertion, the opening of the joint 10 expands due to the spring action of the joint 10 and the joint 20 is inserted. When the joint 20 fully enters the joint 10, the opening is restored by the spring action. When the insertion is completed in this manner, the catching projections 10a and 10b of the joint 10 and the projecting projections 20a and 20b of the joint 20 are caught and will not come out even if a pulling force is applied. As a result, the steel plates are abutted and connected.
[0007]
FIG. 5 is a view showing one embodiment of the reinforcing frame assembling method of the present invention, FIG. 5 (a) is a front view, and FIG. 5 (b) is a plan sectional view. In FIG. 5, 1 is the pier column supporting the concrete viaduct, 2 is the reinforcing frame made of steel, 4 is the foundation of the pier column, G is the ground, 6 is a connecting device for connecting the reinforcing frames, and 6a is the reinforcing frame. A pin for attaching the connecting device to the frame, 7 is a reinforcing frame assembling device for raising the reinforcing frame, 7a is a jig, 7b is a pulley, 8 is a wire, and 9 is a winding device for winding the wire.
The reinforcing frame to be used is a U-shaped cross section provided with a joint as described in FIG. 4, and as shown in FIG. 5A, a part of the soil at the base portion of the pier column 1 is excavated. The foundation 4 is exposed, and the lower end portion of the reinforcing frame 2 is inclined and placed opposite to both sides so as to surround the pier column 1.
[0008]
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 with pins 6a.
Next, a reinforcing frame assembling apparatus 7 for raising the reinforcing frame is attached to the upper rear surface of each reinforcing frame 2. The reinforcing frame assembling apparatus 7 includes a jig 7a and a pulley 7b attached to the jig 7a. The jig 7a is provided so that a relatively thin reinforcing frame steel plate does not bend due to the load applied to the pulley, and a hole is formed in the reinforcing frame in advance and attached to the hole with a bolt or the like. A simple structure may be used, for example, a hook is provided on the frame and a jig is attached to the hook.
[0009]
Next, the wire 8 is passed around the pulleys of both reinforcing frames installed on both sides of the pier column and wound a plurality of times, one end thereof is connected to the hoisting device 9, and the other end is connected to the reinforcing frame on the opposite side of the hoisting device. The position P is fixed. In addition, by winding a wire a plurality of times between pulleys, the load per wire can be reduced, and a thin wire can be used, so that handling becomes convenient.
[0010]
Next, the wire 8 is wound up by the winding device 9. Since the reinforcing frame 2 is inclined so that the upper end portion is higher than the lower end portion, when the pulley is pulled so as to approach each other by winding the wire, it rotates around the pin 6a. Get up from the ground. In the process of rising, the convex joint and the concave joint shown in FIG. 4 are gradually joined from the lower end toward the upper end, and the connection is completed when the rising ends. In the process of joining the joint, the part where the convex joint is inserted into the concave joint moves sequentially from the lower side to the upper side, and the part that generates friction for insertion is a part. Less force is required. In addition, the play between the joints is increased to facilitate joining, and after joining, as shown in FIG. If it is eliminated, the joining can be facilitated and a firm joining can be obtained. After the connection, a wedge or the like is inserted between the reinforcing frame 2 and the foundation 4 to remove the pins 6a so that the reinforcing frame is directly received by the foundation 4.
Thus, the assembly can be performed with a simple device without using a scaffold and without using a crane.
[0011]
FIG. 7 is a diagram for explaining another embodiment of the present invention. In FIG. 7, the same numbers as those in FIG. 6 indicate the same contents.
The method shown in FIG. 7 is the same as that in FIG. 6 except that the startup assisting device 40 is used. In FIG. 6, the base portion of the pier column is excavated to form a recess, and the reinforcement frame is inclined by placing the end of the reinforcement frame in this portion. It is possible to raise. However, for example, in the case of a two-layer structure or a three-layer structure viaduct and when a reinforcing frame is installed at the second, third, etc., it cannot be tilted. The reinforcing frame is installed horizontally, and the wire passing the wire by the method shown in FIG. 6 is also stretched horizontally, and even if the wire is wound up, the reinforcing frame is merely brought closer to each other and the reinforcing frame does not stand up.
[0012]
Therefore, in FIG. 7, the reinforcing frames are installed, the reinforcing frames are connected to each other by the connecting device 6, the assembly device 7 having a pulley attached to the upper portion of the reinforcing frame is attached, and the start-up auxiliary device 40 is placed at the position of the connecting device 6. The wire 8 that is installed and stretched between the assembly devices is placed on the auxiliary device 40, and the central portion of the wire is raised with respect to both ends. In addition, since the movement of the wire is in both directions, the portion on which the wire of the start-up assisting device is placed has a smooth surface on which the wire can move.
[0013]
When the wire is wound up by the winding device 9 in this state, a vertical component force acts on the pulley from the wire and the reinforcing frame starts to rise. Once standing up, as in FIG. 7, the pulleys are pulled so as to approach each other by winding the wire, and the reinforcing frame 2 turns around the pin 6 a and rises. The convex joint and the concave joint shown in FIG. 4 are gradually joined from the lower end toward the upper end, and the connection is completed when the rise ends.
[0014]
FIG. 8 shows a state of being connected in this way, and a filler such as epoxy resin or mortar is filled between the pier column 1 and the steel plate 2 to complete the reinforcement work.
In the above description, the reinforcing frame has a convex joint and a concave joint as an example. However, the present invention is not limited to this, and a bolt using an attachment plate as in the prior art. It is also possible to apply it when connecting by welding.
[0015]
【The invention's effect】
As described above, according to the present invention, the reinforcing frame member can be installed within a predetermined accuracy simultaneously with the erection and assembly, and since most of the work is performed on the ground, there is no need for a work scaffold. Occurrence of occupational accidents such as falls and crashes can be prevented. In addition, since no scaffold is required, the construction cost can be greatly reduced, and further, the construction period can be significantly shortened by providing a joint device on the reinforcing frame.
[Brief description of the drawings]
FIG. 1 is a view for explaining a conventional method of assembling a pier reinforcement frame.
FIG. 2 is a view showing a scaffold used in a conventional assembling method.
FIG. 3 is a diagram for explaining a conventional method for reinforcing a pier column.
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 reinforcing frame assembling method according to the present invention.
FIG. 6 is a diagram illustrating a reinforcing frame assembling method according to the present invention.
FIG. 7 is a view showing another example of a reinforcing frame assembling method according to the present invention.
FIG. 8 is a diagram showing a connected state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Pier column, 2 ... Reinforcement frame, 4 ... Foundation, 6 ... Connecting device, 6a ... Pin, 7 ... Reinforcement frame assembly device, 7a ... Jig, 7b ... Pulley, 8 ... Wire, 9 ... Winding device, 30 ... Bolt, 40 ... Startup assist device.

Claims (5)

A stage where the reinforcement frame is installed facing both sides of the pier column, a stage where a connecting device for coupling the reinforcement frames is attached to the lower end of the installed reinforcement frame, and an assembly device provided with pulleys is attached to the top of each reinforcement frame. A method of assembling a pier reinforcement frame comprising the steps of winding a wire around the wire, and winding up the wire with a winding device so that the reinforcement frames are raised, butted and joined together. 2. The method of assembling a pier reinforcement frame according to claim 1, wherein a start-up auxiliary device is disposed at the position of the connecting device, and a wire between the pulleys is placed on the start-up auxiliary device. 3. The pier according to claim 1, wherein a reinforcing frame provided with a convex joint and a reinforcing frame provided with a concave joint are used so that the connection is completed at the same time as starting up. Reinforcement frame assembly method. 4. A method for assembling a pier reinforcement frame according to claim 3, wherein after the reinforcement frame is connected, a force is applied in a direction in which the two reinforcement frames are separated from each other. 3. The method according to claim 1 or 2, wherein the assembly device attached to the upper portion of the reinforcing frame includes a pulley attached to a jig.

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