JPH04203079A - Column body and assembly method thereof - Google Patents

Abstract

PURPOSE:To obviate the construction of a derrick or a large-sized crane and assemble a columnar body safely by raising and lowering a centering to insert and connect unit columns successively downward of a mast. CONSTITUTION:A hold-bar 1 is provided to the foundation of a pylon, a square mast M is placed on the center of a base plate F, a centering 6 and a roller frame 8 are respectively inserted in the lower and upper parts of the mast to interlock, and the hold-bar 1 is used to load a turning table 3 and a boom 5 on the mast M. After that, side holders S and S are fixed on the base plate F, a ceiling holder H divided into two parts lengthwise is suspended between the side holders to secure them as a unit. Then, the centering 6 is raised to push the mast M up to the position of the ceiling holder H, and unit columns U1 and U2 are inserted and connected downward thereof. Then, after the roller frame 8 is interlocked with the ceiling H, the centering 6 is raised and lowered to insert and connect the unit columns U1 and U2 successively downward of the mast M. After column bodies are pushed up to a self-supporting height, the lower ends of them are fixed on the base plate F.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a construction column provided at the center of a power transmission tower during construction, and a method for assembling the same.

[Prior art] Terms common to the present invention and the prior art are "column" and "
The two words "must" are defined as follows.

When constructing a steel tower, multiple "unit columns" connected together are built in the center of the tower, and these are called "columns." The topmost unit column is called a "mast" because it has a structure that can support heavy objects at its upper end.

Let's move on to the explanation of the conventional example. Apart from ultra-high voltages such as UHV power transmission, for power transmission of about 220 to 500 KV, tower assembly was performed in the following manner.

Construct derrick D as shown in Figure 6. A pair of two-part frames K are assembled on the base plate F using a derrick and fixed facing each other. The height of the pedestal is usually about 8 to 12 m. Unit column U (3 to 4 m) is fixed on base plate F. If the frame K is high, add more U2. Mast M to U
Connect on top of l. A lifting device is attached to the pedestal K.

(There are a hydraulic system and a wire semi system.) A swivel stand 3 and a boom 4 are mounted on the mast M.

The unit pillars are connected one after another, and the raising is stopped when the column reaches a height at which it can maintain its vertical position without any other support, the so-called self-supporting height.

Derrick D is a problem in the conventional process described above. For example, in a mountain slope where there are no roads, heavy objects such as booms are disassembled and transported to the construction site by helicopter or aerial cable. However, unless Derrick D is constructed, the column cannot be assembled.

A derrick is usually a rectangular parallelepiped made of steel with a length of 0.7 to 1 m and a height of 3 to 4 m, stacked in four or five stages, and a jib crane is installed at the bottom. A large crane truck may be used instead of this derrick.

The construction of the derrick is made of white birch. Large crane trucks require roads and large construction sites to reach the site.

Furthermore, constructing a derrick using white birch requires a considerable amount of time and effort. Since the work area was small, and they wanted to reduce the number of tools as much as possible, the challenge for site workers was to construct the pillars without a derrick or large crane. Furthermore, even if a derrick or large crane is used, working at heights of 8 to 12 meters is difficult and requires skill, and improvements have been needed from a safety standpoint.

[Means for solving the problem] A mast with a height of 2 m or less is placed in the center of the base plate, a raised frame is inserted into the lower part of the mast, and a roller frame is inserted into the upper part of the mast and locked. Place a swivel base on the mast and fix the lower end of the boom on top of it. The top of the boom is supported by wires from the triangular frame. Side frames with a height of 5 to 6 m will be installed on the left and right sides of the mast.

A small white birch tree is placed near the trestle and used to perform the above work. After the boom is upright, the left and right side trestles are connected with the ceiling trestle. To avoid collision with the boom, prepare the ceiling mount in two parts and assemble them as one piece on the side mounts.

The mast can pass through the ceiling frame, and a roller frame that can be attached to and detached from the mast is provided in the passageway.

The roller frame has diagonally inner and outer rollers, the outer roller being able to engage tightly with the guide of the through passage, and the inner roller being able to engage closely with the outer corner of the mast.

With heavy objects (swivel base and boom) placed on the top of the mast, the lifting frame is raised to the ceiling mount position, and a unit column is inserted and connected below. I replaced the roller frame with the ceiling mount and continued raising it.
Connect the unit pillars until they reach a free-standing height.

As mentioned above, the work can be done using only white birch trees without a large crane truck. If necessary for the operation of the base rod, the side frame can be divided into two parts, upper and lower, and the roller frame can be divided into two parts, left and right. Even after the swivel and boom are assembled on the mast, they can be assembled on the base plate.

Embodiment] The method of assembling the column will be mainly described with reference to FIG. 1, and the structure of the main parts will also be clarified.

A base plate F is fixed in the middle of the tower, and a rectangular cylindrical mast M is fixed in the center of the base plate.

A raised frame 6 is fitted in the lower part of the outer periphery of the mast, and a roller frame 8 is fitted in the upper part, and these are fixed to the mast with a removable bottle (not shown). As shown in FIG. 4, the raising frame 6 is provided with outer rollers 6a in the diagonal direction and is attached with a raising device using a hydraulic cylinder, so that it can be raised and lowered by hydraulic power. The raising may be done by a wire semi method using a pulley. A swivel base 3 is mounted on the mast M, a triangular frame 4 is fixed thereon, and a boom 5 is also placed and the lower end is locked.

Side frames S are erected on both sides of the mast M. The height of the side frames is 5-6 m. The boom 5 stands upright and protrudes upward between the left and right side frames (FIG. 2).

The lower end of the white birch 1 is fixed near the side frame S, and is held down with a row 12 so that the tip faces above the mast M. The white birch is made of steel connected together and is approximately 12 meters long. The white birch 1 is fully utilized for the lifting work of the present invention, including the above-mentioned works.

The unit pillar U1. Bring in U2... and connect it.

As mentioned above, this connecting body is called a "column".

A ceiling mount H is passed over and fixed on the left and right side mounts S. Although the ceiling mount H has a rectangular frame, it cannot be directly moved onto the side mounts using white birch. This is because it is obstructed by the boom 5 extending upward. Therefore, the ceiling mount H is divided into two in advance in the vertical direction. It is suspended from one side at a time surrounding the boom, integrated with bolts, and then fixed to the side frame S. There are square guides Hg at the four corners of the ceiling frame H, which are connected to square guides Sg provided at each of the two corners of the left and right side frames S (FIG. 3).

The roller frame 8 is a rectangular body with guide plates 8a at each of its four corners, which are tied together with rods 8b (FIG. 5).

The guide plate 8a is provided with an inner roller 8C and an outer roller 8d diagonally.

The inner roller 8c is located at the outer corner of the mast M, and the outer roller 8d
are guided by guides Hg and Sg of frames H and S, respectively.

In addition to this, the roller frame 8 is provided with a bin 9 that can be locked to a column, and a bin 10 that can be locked to a ceiling frame, all of which can be switched into eight positions.

The roller frame being raised is engaged with the mast M using the bin 9,
The engagement between the bin 10 and the frame H (S> is kept off. In other words, the roller frame is guided by the guides Sg and Hg and rises together with the mast M. At this time, the distance between the two points of the roller frame and the raised frame is constant. to prevent the column from falling.When the mast rises to a predetermined height near the ceiling mount, the lifting is temporarily stopped and the engagement of the bins 9 and 10 between the mast and the mount is reversed.Then, the unit Connect the pillars and resume raising.The roller frame is locked to the ceiling frame H,
The column rises stably while being restrained from falling by the roller frame. Finally, connect the lowest unit column to complete the column to a self-supporting height, and its lower end is supported by the base plate.

The pillars protruding above the ceiling frame are placed with roller guides 1 at appropriate intervals.
1 is provided and is secured to the tower leg with lobes (not shown) to strengthen the column's ability to maintain an upright posture. After this, we will move on to using the boom.

The order of the assembly work does not necessarily have to be as described above, and can be changed to some extent depending on the situation.

[Effects: Building a derrick or a large crane truck, which were previously considered indispensable, is no longer necessary for assembling the column, making it possible to assemble the column directly using only a small white birch. The number of man-hours needed to assemble the boom-mounted column in areas where cranes cannot access is reduced by nearly 30%.

In addition, the swivel part, boom, etc. must be assembled in a low place (approximately 3 m) above the ground.
This greatly improves safety.

[Brief explanation of the drawing]

Figure 1 is a front view of the boom mounting column, Figure 2 is an explanatory diagram for assembling the ceiling mount, Figure 3 is a perspective skeleton diagram of both mounts, and Figure 4
The figure is an explanatory diagram of a lifting device, FIG. 5 is a plan view of a corner of a roller frame, and FIG. 6 is an explanatory diagram of a conventional method. 1-White birch, 2-lobe, 3-swivel base, 4-triangular frame, 5-boom, 6-raised frame, 7-rope, 8-roller frame, 8a-guide plate, 8c-inner roller, 8d - Outer roller, 9.10 - Bin, 11 - Roller guide, L - Tower leg, F - Base plate, M - Mast, S - Side mount, H - Ceiling mount, Sg. Hg-guide, B-boom, 01. U2-unit column. Patent applicant: Kyushu Electric Construction Co., Ltd. (1 other person)

Claims (2)

[Claims] (1) A rectangular mast that can be fixed to the base plate, left and right side frames that sandwich the mast and are fixed to the base plate, a swivel base and boom that are attached to the mast, and a raised section that allows the mast to be mounted below the mast. A ceiling mount that connects the left and right side mounts with a lifting device that can be connected one after another with unit pillars with the same cross section as the 1st column, and is fixed to the upper part and has corner parts connected to the corner corners of the lateral mounts, and a square ceiling mount. A column body comprising: a roller frame having diagonal rollers inside and outside the corners, and guided to the corners of the mast by the inner rollers and to the corners of the ceiling mount by the outer rollers. (2) Method for assembling a boom-mounted column including the following steps: (a) Installing a support rod at an appropriate location on the tower foundation or its surroundings. b. Place the square mast in the center of the base plate. c. Insert and lock the raised frame at the bottom of the mast and the roller frame at the top of the mast. d. Attach the swivel base and boom to the mast using the base rod. e. Place the boom in an upright position. f. Fix the side frames facing each other on the base plate. g. Suspend the vertically divided ceiling mount into two parts between the side mounts and secure it to the integrated upper and lateral mounts. h. Raise the mast to the ceiling mount position by raising the raising frame, and insert and connect the unit column below. i. Lock the roller frame to the ceiling frame and disconnect it from the mast. j. Raise and lower the raised frame and insert and connect the unit pillars one after another below the mast. k. Raise the column to a free-standing height and place the lower end on the base plate.