JP2002302382A - Vertically suspending method of long size material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertically suspending method for building up and temporarily arranging a long size material such as concrete by vertically suspending the long size material by a two-point suspending method, or carrying in and carrying out the other long size material. SOLUTION: This vertically suspending method of the long size material vertically builds up and temporarily arranges or carries in and carries out the long size material precast from a wall body of a concrete structure. In the vertically suspending method of the long size material, suspending metal fittings are fixed to two places unbalancing to a lengthwise directional gravity center position of the long size material, a suspending rope is installed on the two suspending metal fittings, a pulley is arranged in the middle of the suspending rope, the pulley moves the suspending rope by suspending the pulley, and lifts the lightweight suspending metal fitting side long size material from an end surface, and suspends the long side material in a vertical state, and arranging positions of two fixtures arranged in the lengthwise direction of the long size material are limitedly arranged in two positions around 0.3 L from one end surface, and around 0.1 L from the other end surface to the length L of the long size material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long object such as concrete, which is vertically suspended by a two-point suspension method, built and temporarily installed, and for carrying in and out other long objects. It relates to a vertical suspension method.

[0002]

2. Description of the Related Art In general, in order to stably lift a suspended load at one point, it is necessary to clearly determine the position of the center of gravity of the suspended load, and to hang a rope at that position. However, it takes time to determine the exact position of the center of gravity of the suspended load at the site, and the two-point suspension method is often used. With the two-point suspension method, the center of gravity is placed in the two suspension brackets suspended at the two points, and the hook is lifted almost directly above the center of gravity, and the rope hanging on the two suspension brackets is lifted by the hook. As a result, stable ground cutting was performed.

In a concrete structure such as a cylindrical tank, the wall is divided into a plurality of concrete walls having a predetermined width in the circumferential direction in order to shorten the construction period of the wall and save labor. Therefore, a precast panel system in which a concrete wall is manufactured horizontally on the ground of a factory or a site, and the concrete wall is sequentially erected at a predetermined position and assembled integrally, has come to be used in many cases. In this scheme,
It is necessary to lift a panel wall manufactured horizontally on the ground and vertically erected it, and there is a problem that a conventional two-point hanging method can only hang a concrete wall horizontally and cannot be erected. For this reason, a hanging bracket is installed at the end of the concrete wall or at the entrance
A method has been proposed in which the concrete wall is lifted from one side of the concrete wall at one point with respect to the longitudinal direction of the concrete wall, lifted vertically, and built. Furthermore, it is conceivable to lift by shifting the position of the two hanging brackets to either one of the positions of the center of gravity of the concrete wall in the longitudinal direction. However, with the lifting, a load acts only on the rope near the center of gravity of the concrete wall. The other ropes are loosened and have the same effect as the one-point suspension described above.

[0004]

According to the above-described technique of hanging at one point, it is possible to lift a concrete wall vertically. However, since the lifting is performed at one point, the concrete wall may rotate at the time of lifting. Becomes unstable,
The work of building concrete walls becomes unsafe or takes time to build. In addition, when lifting a concrete wall, the concrete wall is lifted from one end face and lifted, but in a concrete wall which is relatively long in a longitudinal direction from several meters to several tens of meters,
The concrete wall will be supported at only one end, and the concrete wall will be subjected to a large bending moment due to its own weight, and the concrete wall will be subjected to a tensile stress exceeding the allowable value during lifting, causing cracks to occur. Become. For this reason, in order to prevent cracks from occurring, it is necessary to increase the thickness of the concrete wall and increase the amount of rebar for lifting, which makes the structure extremely uneconomical. It is.

[0005] Therefore, the present invention provides a vertical suspension method for safely and efficiently lifting a long object such as a concrete wall of a concrete structure.

[0006]

That is, the present invention relates to a method for vertically suspending a long object for temporarily installing a long object obtained by precasting a wall or the like of a concrete structure. By fixing hanging brackets at two places that are not balanced with respect to the longitudinal center of gravity of the shaku, attaching a hanging rope to the two hanging brackets, providing a pulley in the middle of the hanging rope, and lifting the pulley This is a vertical hanging method of a long object in which a pulley moves a hanging rope to lift the long object in a vertical state by lifting the long object from the end face of the lighter hanging metal fitting side. In addition, the installation positions of the two fixtures provided in the longitudinal direction of the long object are two positions, about 0.3 L from one end face and about 0.1 L from the other end face, with respect to the length L of the long object. This is a method for vertically suspending a long object provided only at a certain position.

The concrete wall and the like of the concrete structure need only have a thickness and strength enough to withstand normal use of the structure. As the suspending fitting, a commonly used structure in which an insert is embedded in a concrete wall and a suspending implement is connected to the insert may be used. The position where the hanging fitting is fixed may be provided so as to sandwich the longitudinal center of gravity of the concrete wall, or two places may be received on one side of the center of gravity, and two places that are not balanced with respect to the longitudinal center of gravity. It should just be installed in. When the width of a concrete wall or the like is small, only one place may be used. However, if two places are installed in parallel in consideration of stability at the time of lifting, efficient lifting work can be performed.

[0008] The pulley is installed on a suspension rope connected to two suspension fittings, and is movable on the suspension rope. The upper part of the pulley is connected to a long object hanging bracket, and the long object hanging bracket is hung by a hook such as a crane. As the suspension rope, a commonly used wire rope or the like is used.

In the case where the long object has a relatively thin wall thickness such as a prestressed concrete structure, the position of the two suspension fittings installed in the longitudinal direction is determined with respect to the length L of the long object.
0.375L from one end of long object and 0.175L from the other end
L are installed at two positions.

When curing of the concrete wall, which is a long object, is completed, a hanging rope is hung on two hanging members fixed to the concrete wall, and the pulley installed in the middle of the hanging rope is lifted by the long object hanging member. . The pulley is lifted from one end face of the concrete wall while moving toward the hanging fitting near the end face of the concrete wall, and is lifted in a vertical state. At this time, tension is uniformly applied to the suspension rope through the pulley. The concrete wall is lifted in a vertical state and carried to a predetermined position, and is supported and fixed by a support material or the like, and the concrete wall is built. When the concrete wall has a relatively thin wall thickness, such as a prestressed concrete structure, the fixed position of the hanging bracket is limited to the above-mentioned position, so that it is supported at two points by the action of the pulley, and Exerts only a small bending moment, and does not cause cracking or the like due to the bending moment.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view illustrating a method for lifting a long object according to the present invention. The concrete wall 1 obtained by dividing the wall of the concrete structure into a plurality in the circumferential direction has a length L in the longitudinal direction. In the longitudinal direction of the concrete wall 1, 0.375L from one end and 0.175L from the other end.
Two suspension fittings 2 are fixedly provided at the position of L. The suspension fitting 2 is fixed by an insert or the like embedded in the concrete wall 1. One suspension rope 3 is attached to the two suspension fittings 2, and a pulley 4 is provided between the suspension ropes 3. The pulley 4 is fixed to a long object hanging metal fitting 5 suspended at an upper portion by a hook such as a crane.

In the present embodiment, since the concrete wall 1 is exemplified, the position of the hanging metal fitting 2 in the longitudinal direction of the concrete wall 1 is limited to a position where the bending moment generated in the concrete wall is minimized. May be installed at a position that is not balanced with respect to the center of gravity in the longitudinal direction.

FIG. 2 is a front view of FIG. Hanging bracket 2
Are fixed at two places in the width direction of the concrete wall 1. The suspension rope 3 attached to the suspension fitting 2 passes through the sheave of the pulley 4 and is connected to the other suspension fitting 2 in the longitudinal direction. The two pulleys 4 are fixed in parallel to a long object hanging metal fitting 5 provided on the upper part. In the present embodiment, the method of disposing the hanging fitting 2 at two places in the width direction is disclosed. However, when the width of the concrete wall 1 is small, only one place can be provided.

FIG. 3 is an explanatory view showing a state of lifting a long object. When the pulley 4 is lifted by a crane or the like in the state of FIG. 1, since the position of the two hanging fittings 2 is not balanced with the center of gravity of the long concrete wall 1, the hanging rope 3 is moved inside the pulley 4. By moving
The concrete wall 1 is gradually lifted from the end face on the side of the hanging fitting 2 where the weight becomes lighter. When the concrete wall 1 rises to the other end face, the concrete wall 1 is lifted in the vertical state. The hanging rope 3 is movable in the pulley 4 and is always under a uniform tension. Further, since the concrete wall 1 is hung at two places in the longitudinal direction, the concrete wall 1 is less likely to rotate or swing during the lifting, and safe temporary work can be performed.

The concrete wall 1 suspended in a vertical state is
The concrete wall 1 is transported to a predetermined position and vertically supported and fixed by a support material or the like, and the concrete wall 1 is built. In this manner, the concrete walls 1 are successively erected, and the concrete wall 1 is laid between the erected concrete walls 1 to form an integrated wall.

FIG. 4 shows the bending moment applied to the concrete wall in the suspended state of FIG. Assuming that the length of the concrete wall 1 is L, the bending moment (49qL / 3200) at the position of the hanging fitting 2 of 0.175L from the end face is maximum, but the tensile stress generated on the concrete surface is suppressed to an allowable value or less. And no cracking or the like occurs.

FIG. 5 is a side view for explaining a method of hanging a long object according to another embodiment. The propulsion method is a method in which a tunnel hole is excavated from the inside of the starting shaft toward the reaching shaft, and a propulsion pipe is buried in the ground. The shield machine 6 controls the direction in the ground. Because it has a relatively long structure for mounting equipment and equipment of the excavation mechanism at the tip,
At sites where construction of shafts is restricted, shield excavators 6
It may not be possible to carry in or remove it when it is horizontal. In this case, hanging brackets are fixed to the longitudinal outer shell of the shield machine 6 at two points not balanced with the center of gravity of the shield machine 6 in the longitudinal direction, and in the middle of the hanging rope 3 attached to the two hanging machines. A pulley 4 is provided. By lifting the pulley 4 in this state, the pulley 4 is lifted from the rear end of the shield machine 6 on the side of the lighter hanging fitting, and is lifted vertically. For this reason, removal and removal from a narrow shaft has become safe and easy.

[0018]

As described above, according to the method for vertically suspending a long object according to the present invention, a pulley is used to support and lift the two objects at the positions of two hanging metal fittings provided in the longitudinal direction of the long object. It does not rotate or shake when suspended vertically,
It is now possible to build safe and efficient concrete walls, etc., and to suspend shield excavators vertically. In addition, by limiting the position of the hanging brackets, cracks are not generated by the bending moment due to its own weight when lifting, even for relatively thin concrete walls such as prestressed concrete. It was possible to provide an economical structure without forming a wall.

[0019]

[Brief description of the drawings]

FIG. 1 is a side view illustrating a method of lifting a long object according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is an explanatory diagram showing a state of lifting a long object.

FIG. 4 shows a bending moment applied to a concrete wall in a suspended state in FIG. 1;

FIG. 5 is a side view illustrating a method for hanging a long object according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete wall 2 Hanging metal fitting 3 Hanging rope 4 Pulley 5 Long metal hanging metal fitting 6 Shield excavator

Claims (2)

[Claims] The present invention relates to a method for vertically suspending a long object obtained by precasting a wall or the like of a concrete structure or the like to vertically erection, or to carry in or out another long object. Then, hanging brackets are fixed at two places that are not balanced with respect to the longitudinal center of gravity of the long object, a hanging rope is attached to the two hanging brackets, a pulley is provided in the middle of the hanging rope, and the pulley is provided. A method for vertically hanging a long object, wherein the pulley moves a hanging rope by lifting the object, thereby lifting the light object from the end surface of the long object on the side of a light-weight hanging fitting, and lifting the long object in a vertical state. 2. The installation position of the two hanging members provided in the longitudinal direction of the long object is about 0.4 L from one end face and about 0.2 L from the other end face with respect to the length L of the long object. 2. The method of vertically suspending a long object according to claim 1, wherein the long object is provided only at two positions.