JP2012233344A - Method for connecting mast, and device for use in the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for connecting a mast, which facilitates construction on a narrow site, and a device for use in the method.SOLUTION: A shuttle is attached to an existing lower mast, and an upper mast is connected on a knot-by-knot basis onto the lower mast by using a vertical movement function and a rotation function around a central axis, which are provided for the shuttle. The upper mast is attached to the shuttle, firstly lifted to a position higher than the lower mast, and subsequently moved horizontally above the lower mast. Since a distance between the lower mast and the rotation axis of the shuttle and a distance between the upper mast and the rotation axis of the shuttle are equal to each other, the upper mast horizontally moved by the rotation of the shuttle is positioned directly above the lower mast. Finally, the shuttle is lowered, and a flange of a lower end of the upper mast and a flange of an upper end of the lower mast are fixed by a bolt.

Description

The present invention relates to a method for connecting a plurality of masts and an apparatus used for the method.

In the case of building a long columnar body with a total length of several tens of meters, there is a conventionally known method in which a plurality of masts are connected on the ground to form a single continuous columnar body and then raised using a hoist. Even now, building pillar construction by this method is being carried out at many sites. However, this method requires a large and flat site where long columnar bodies can be placed upside down, and also requires a sufficient working radius for safe operation of the hoist. It is not suitable for construction in large urban areas and mountain areas that require logging.

Several techniques have been proposed so far for enabling construction on a narrow site, and typical ones include those disclosed in Patent Documents 1 and 2. Patent Document 1 discloses a construction method in which masts are added one by one from the top to the bottom. On the other hand, Patent Document 2 discloses a method of stacking one section at a time from the bottom to the top.

JP-A-7-301026 JP-A-8-296346

In the construction method of adding a mast to the bottom as disclosed in Patent Document 1, when a new mast is added, a plurality of masts connected so far must be lifted and floated in the air. A lifting device with a simple structure and a pedestal for supporting them are required. Therefore, there is a problem that the work load at the preparatory work stage before the start of the main work is large and the construction cost increases.

On the other hand, in the construction method in which masts are stacked on top of each other, the load burden applied when the mast is raised and lowered is a part of the mast, so that the support structure including the lifting device can be simplified. However, in Patent Document 2, since it is a stacking work while simultaneously manipulating two ropes, a rope for lifting the mast and a rope for guiding the position, the work difficulty is high, and time is wasted if not used. Become.

The present invention was created as a problem to be solved by solving the problems in the prior art, and the object thereof is a mast connecting method and method for facilitating construction in a narrow site. It is in providing the apparatus used for.

In order to achieve the above object, the present invention is a method of connecting an upper mast to a lower mast that is erected in a vertical direction, a step of attaching a lower guide rail to the lower mast, and an upper and lower portion around a central axis. A step of mounting the lower portion of the shuttle that can rotate relative to the lower guide rail so as to be movable in the vertical direction, a step of mounting the upper guide rail to the upper mast, and a portion of the upper portion of the shuttle vertically to the upper guide rail A step of movably mounting in a direction, a step of temporarily fixing the upper mast so as to be immovable with respect to the shuttle, a step of moving the shuttle to a height where the lower end of the upper mast exceeds the upper end of the lower mast, Rotating the upper portion of the shuttle relative to the lower portion to position the upper mast directly above the lower mast; and moving the shuttle downward. A step of connecting the lower mast and the upper mast by, to release the temporarily fixed relative to the shuttle of the upper mast comprises a step of moving the shuttle down, to provide a method.

Furthermore, the present invention is an apparatus for connecting an upper mast to a lower mast standing in a vertical direction, and includes a lower guide rail mounted on the lower mast, an upper guide rail mounted on the upper mast, and upper and lower portions. A shuttle that is relatively rotatable around a central axis, a first guide that is mounted on the upper and lower portions of the shuttle and that is movable on the lower guide rail in a vertical direction, and is mounted on the upper portion of the shuttle And a second guide mounted on the upper guide rail so as to be movable in the vertical direction, and a stopper for temporarily fixing the second guide to the upper guide rail so as not to move. To do.

In the present invention, when the masts are connected, the upper mast is connected to the lower mast and the mast is stacked. Using the movement function in the vertical direction and the rotation function around the central axis of the shuttle, the masts are connected by combining the two movement processes of movement in the vertical direction and movement in the horizontal direction. The shuttle rises along the lower guide rail with the upper mast temporarily fixed to the upper part of the shuttle, moves the upper mast to a predetermined height, rotates the upper part of the shuttle at that position, and moves the upper mast to the true position of the lower mast. Move horizontally to the upper position. When the mast connection is finished, the temporary fixing of the upper mast is released, and the shuttle is lowered along the upper guide rail and the lower guide rail. By repeating a series of operations of the shuttle, it is possible to connect the masts in order.

If the lower mast and the upper mast are at the same distance with respect to the rotation axis of the shuttle, the upper mast is positioned directly above the lower mast simply by rotating the shuttle.

According to the present invention, the masts are connected using the vertical moving function and the rotating function of the shuttle, so that the connecting work is possible even in a narrow site where there is no room for heavy equipment. Further, since the upper mast is guided to a position suitable for connection by the function of the shuttle, the connection work can be easily performed even by a skilled engineer.

Overall view of the wind observation mast 1-bar mast structure Structure diagram of verses 2 to 13 Side view showing the state where the 1-bar mast and 2-bar mast are connected 14-bar mast structure Work situation diagram showing the construction of 1-bar mast and 2-bar mast Side view showing the state where the 1-bar mast and 2-bar mast are fixed Shuttle structure Work situation diagram showing how the upper shuttle is mounted Structural drawing of the overhead equipment Work situation diagram showing how the lower shuttle is installed Schematic diagram showing how to connect a three-bar mast Working situation diagram showing the movement of the 3-bar mast by the shuttle's vertical movement function Working situation diagram showing the movement of the three-bar mast by the shuttle rotation function Work situation diagram showing how the two-bar mast and the three-bar mast are connected Work situation diagram showing the removal of the 14th section guide rail Work situation diagram showing the removal of the 13th section guide rail

Embodiments of the present invention will be described with reference to the accompanying drawings. The wind condition mast shown in FIG. 1 is a structure for observing and recording wind conditions in a local area. It is a long structure with a total height of 40 m in which 14 steel pipe masts are connected in the vertical direction, and is supported from four directions by eight stages of branch lines. Wind direction and anemometers are installed at 30m and 40m above the ground respectively, and a lightning rod is installed at the top. A base plate and a branch anchor for fastening the branch line are installed on the ground surface in consideration of ground strength.

The one-bar mast shown in FIG. 2 is a steel pipe mast located at the bottom of the wind observation mast. The one-node mast is mainly a round steel pipe having a total length of 3 m, and lifting scaffolds are provided at appropriate intervals on opposite sides across the central axis. A connection flange is provided at the top and is used when connecting to other steel pipe masts. The lowermost part is connected to a mast receiver pivotally supported on the base plate, and is fixed by a mast fastening bolt. One lifting scaffold is provided with FM Sky Rock (registered trademark). FM Sky Rock (registered trademark) is a safety elevating facility for preventing a worker who ascends and descends a wind observation mast using an elevating scaffold. A guide rail is further installed at the same place as FM Sky Rock (registered trademark), and is fixed with a guide rail retaining bolt. The guide rail is arranged in parallel with the one-node mast, and the upper end is at the same height as the uppermost end of the one-node mast (the upper end of the connection flange). Since the total length of the guide rail is slightly shorter than the total length of the one-node mast, a gap of about several tens of cm is formed between the guide rail and the base plate.

All the 12 steel pipe masts connected to the top of the 1-bar mast are the same type. Here, the second stage mast shown in FIG. 3 will be described as an example. The two-bar mast is basically the same structure as the one-bar mast, and has a structure in which an elevating scaffolding, FM Sky Rock (registered trademark), and a guide rail are installed on a hollow round steel pipe. The difference from a one-bar mast is that a connection flange is provided at the bottom, and that the total length of the guide rail is the same as the total length of the mast, and that the upper pulley support bracket is located slightly above the center. Is provided. A pulley is attached to the upper pulley support bracket, and is used when lifting a steel pipe mast, material, and the like after the third joint using a winch.

As shown in FIG. 4, when the one-node mast and the two-node mast are connected, the one-node guide rail installed on the one-node mast and the two-node guide rail installed on the two-node mast are continuously connected. Similarly, when steel pipe masts after the third joint are connected, the guide rails are continuous each time, and the total length of the connected guide rails is extended.

As shown in FIG. 5, the 14-node mast at the top of the wind observation mast has a full length that is half that of other steel pipe masts, and a lightning rod is provided at the top.

Next, the procedure for building a wind observation mast will be described. The 1-bar mast and 2-bar mast are connected in a laid state, and then erected as shown in FIG. The lower end of the one-bar mast is connected to the mast receiver. A winch fixed mount is attached to the position closer to the base plate than the center of the one-bar mast so that it is perpendicular to the steel pipe mast, and a hand wound winch is installed at the tip of the mount. A temporary reinforcement rope is erected between the tip of the winch fixed base and the one-node mast. The erected temporary rope wound around the manual winding winch is pulled out in the erected direction and connected to a temporary anchor placed on the ground using a shackle or the like. Attach the pulley and the four wires that form the first branch line to the two-bar mast.

When the hand-wound winch is operated, the 1-bar mast and 2-bar mast are connected to the 1-bar mast and 2-bar mast through the reinforced temporary rope and the reinforced temporary rope. Moves from a lying position to a standing position. When the 1st and 2nd masts are raised, the first stage branch line is developed in 4 directions, and the tension is adjusted so that the central axes of the 1st and 2nd masts are erected and overlap the position. FIG. 7 shows a state in which the 1-node mast and the 2-node mast are fixed in an upright posture by a first-stage branch line extending in four directions.

When the fixing of the 1st mast and the 2nd mast is completed, the process shifts to the connection work of the steel pipe mast after the 3rd knot. Steel pipe masts after the third node are performed using the mast coupling method of the present invention. This method uses a shuttle in addition to the guide rail. As shown in FIG. 8, the shuttle is composed of two parts, an upper shuttle and a lower shuttle, and both parts are connected by a shuttle turntable. A mandrel is built in the boundary portion of the upper and lower shuttles, so that the upper shuttle and the lower shuttle can rotate relatively around the central axis while maintaining the strength. The upper shuttle is provided with a guide on each side surface facing the center axis. One guide is provided in the center of the upper shuttle and in the vicinity of both upper and lower ends, and a shuttle fixing pin is provided in the lowermost guide. The lower shuttle is provided with three guides only on one side. Each of these guides is provided at the center of the lower shuttle and in the vicinity of both upper and lower ends, as in the case of the upper shuttle. In addition, the lower shuttle is fitted with a bracket that will be suspended from the center at a position slightly below the center.

The upper shuttle is attached to the guide rails in the order of attaching only the guides to the guide rails first and then fixing them to the guides. The upper shuttle mounted on the guide rail is movable in the vertical direction along the guide rail. The guide is attached to the guide rail through a gap formed between the guide rail and the base plate. As shown in FIG. 9, a three-bar mast guide rail is attached to the other guide of the upper shuttle and fastened with a shuttle fixing pin. The shuttle fixing pin serves as a stopper for temporarily fixing the guide and the guide rail so that the guide and the guide rail do not move relatively. As a result, the three-bar mast is temporarily fixed with respect to the upper shuttle, and moves in the vertical direction following the movement of the shuttle. When the installation of the upper shuttle is completed, it is raised along the guide rail to form a space for mounting the lower shuttle directly below the upper shuttle.

A hand wound winch is used to raise the upper shuttle. The hand wound winch can be the one used for erection of the 1-bar mast and 2-bar mast. Since Kepla ropes are used to move the shuttle, the temporary ropes used for the construction are removed and replaced with Kepla ropes. As shown in FIG. 10, the Kepler rope is hung on pulleys attached to the first joint mast and the second joint mast, and a shackle attached to the tip is connected to the upper shuttle.

The lower shuttle is mounted on the guide rail after the upper shuttle is mounted. The mounting method is the same as that for the upper shuttle. The lower shuttle is connected to the upper shuttle after being mounted on the guide rail. At the time of this connection, a mandrel is inserted into the boundary between both shuttles, and temporary fixing is performed using rotation prevention pins so that the upper and lower shuttles do not rotate. The lower shuttle side of the mandrel is fastened with bolts, and the upper shaft side is fastened with slip-proof pins. Finally, remove the shackle connected to the upper shuttle and move it to the lower shuttle. This completes preparation for connecting the three-bar mast. FIG. 11 shows a state where the shuttle is mounted on the guide rail, and a three-bar mast to be connected is mounted on the upper shuttle.

FIG. 12 schematically shows a procedure for connecting a three-bar mast to a two-bar mast. As shown in the figure, a shuttle is attached to the existing 1-bar mast and 2-bar mast, and the vertical movement function and the rotation function around the central axis of the shuttle are used to A three-bar mast is connected to As shown in FIG. 13, the shuttle is first raised to such a height that a gap of several centimeters is formed between the lower end of the 3-node mast and the upper end of the 2-node mast. Next, as shown in FIG. 14, the upper shuttle is rotated 180 degrees around the central axis to invert the three-bar mast. As a result, the 3-bar mast is positioned immediately above the 2-bar mast. As shown in FIG. 15, the shuttle is slightly lowered to join the connection flanges of the 3-bar mast and 2-bar mast. The connection flanges are fixed with bolts while finely adjusting the alignment of both masts so that the three-bar guide rail and the two-bar guide rail are continuous. When the two-bar mast and the three-bar mast are fixed, the shuttle fixing pin is pulled out, and the temporary fixing of the shuttle and the three-bar mast is released. Thus, the shuttle can move in the vertical direction, and can move up and down along the three-node guide rail from the continuous one-node guide rail.

When the connection of the three-bar mast is completed, the work for connecting the four-bar mast is started. First, the shuttle that is moving to the top for lowering the three-bar mast is lowered to the bottom. Next, the 4-bar mast is mounted on the upper shuttle, and the guide and 4-bar guide rail are temporarily fixed with the shuttle fixing pin. Remove the pulley attached to the 2-bar mast and move it to the 3-bar mast. Thereafter, similarly to the connecting operation of the three-bar mast, the four-bar mast is connected on the three-bar mast using the vertical movement function and the rotation function around the central axis of the shuttle. The same procedure and procedure are used to connect the 5-bar mast to 14-bar mast.

In addition, about the attachment of the branch line after the 2nd step | paragraph, it pulls up using an upper pulley, and attaches it to the branch band previously mounted | worn to the steel pipe mast which should attach a branch line. When the installation of the four branch lines is completed, the four branch lines are extended in four directions, and are tensioned so that tension is applied to the branch line anchors substantially evenly.

Finally, wind direction and anemometers are installed at 30 m and 40 m above the ground respectively, and the construction work of the wind observation mast is completed. After this, the guide rails attached to the 1st to 14th masts are removed. This is done in order to reduce the weight and resistance of wind and rain as much as possible. The guide rail is removed from the 14-bar mast in the reverse order of the steel pipe mast connection. After temporarily fixing the guide and the 14-node guide rail with the shuttle fixing pin, the bolts fixing the 14-node guide rail to the 14-node mast are loosened, and the 14-node guide rail is detached from the 14-node mast. The upper shuttle is rotated 180 degrees as it is, and the 14-bar guide rail is moved to the opposite position across the shuttle. FIG. 16 shows a state in which the 14-bar guide rail removed from the 14-bar mast has moved to the opposite position across the shuttle.

From this state, the shuttle is lowered, and the guide on the opposite side of the 14-node guide rail and the 13-node guide rail are temporarily fixed by the shuttle fixing pins as shown in FIG. Then, loosen the bolts fixing the 13-node guide rail to the 13-node mast, rotate the upper shuttle 45 to 90 degrees, and temporarily fix the upper shuttle and the lower shuttle so that they cannot rotate with the rotation prevention pins. As a result, the two guide rails of the 14-node guide rail and the 13-node guide rail temporarily fixed to the shuttle are moved to a position where they do not interfere with the guide rail below the 12th node, and the shuttle is safely lowered. Will be able to. When the shuttle is lowered to the ground surface, the two temporarily fixed guide rails are removed. Remove the guide rails from the 12th mast and beyond in the same way and procedure.

Although the embodiments of the present invention have been described above, the number and shape of the steel pipe masts, the dimensions and names shown in the drawings, and the like are adapted to the specifications of the wind observation mast. The present invention can also be applied to building pillars of structures other than the wind observation mast, in which case the material, shape, number of connections, etc. of the mast can be arbitrarily selected according to the size of the structure and the purpose of use. Can do.

Claims (3)

A method of connecting an upper mast to a lower mast raised in a vertical direction,
Attaching a lower guide rail to the lower mast;
Attaching the lower part of the shuttle whose upper and lower parts can rotate relatively around the central axis to the lower guide rail so as to be movable in the vertical direction;
Attaching an upper guide rail to the upper mast;
Attaching the upper part of the shuttle to the upper guide rail so as to be movable in the vertical direction;
Temporarily fixing the upper mast to the shuttle so as not to move;
Moving the shuttle to a height where the lower end of the upper mast exceeds the upper end of the lower mast;
Rotating the upper part of the shuttle relative to the lower part to position the upper mast directly above the lower mast;
Connecting the upper mast and the lower mast by moving the shuttle downward;
Releasing the temporary fixation of the upper mast to the shuttle and moving the shuttle downward. In the case of connecting at least three masts, two already connected masts are installed on the ground surface as the lower mast, and a third mast is connected to the lower mast as the upper mast. The method described. A device for connecting an upper mast to a lower mast raised vertically,
A lower guide rail mounted on the lower mast;
An upper guide rail mounted on the upper mast;
A shuttle whose upper and lower portions are rotatable around a central axis;
A first guide mounted on the upper and lower portions of the shuttle and mounted on the lower guide rail so as to be movable in a vertical direction;
A second guide mounted on the upper portion of the shuttle and mounted on the upper guide rail so as to be movable in a vertical direction;
An apparatus comprising: a stopper that temporarily fixes the second guide so as not to move with respect to the upper guide rail.

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