JP2000178972A - Positioning construction method for permanent structural column - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the positioning construction method for a permanent structural column, by which the permanent structural column is positioned extremely efficiently with high accuracy. SOLUTION: A working platform 1 is built in specified height, and the permanent structural column 3 is disposed in upright while being penetrated to the floor 4 of the working platform 1. A plurality of extensible supporting arms 6 are installed to the underfloor section of the working platform 1, and at least two places in the vertical direction of the permanent structural column 3 are supported by a plurality of the supporting arms 6. The permanent structural column 3 is positioned by the supporting arms 6. An excavator 2 is loaded on the working platform 1, and a pit is excavated by the excavator 2 while the permanent structural column 3 is positioned in the pit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a vertical column installed underground to support an upper structure during construction by a so-called reverse construction method.

[0002]

2. Description of the Related Art In a reverse striking method in which an underground floor is constructed by constructing in order from the ground to a lower floor, and at the same time the ground floor is constructed in parallel with the basement floor, the pillar is used as a pillar for supporting the upper floor during construction. A straight pillar made of H-section steel, steel pipe or the like is built at the position where the pillar is to be built.

Until now, timber pillars have been constructed in various ways. In general, a pit is drilled at the position where the main pillar is to be constructed first, in accordance with the core of the main pillar. Form a foundation or foundation pile at the bottom.

[0004] Then, a trussed pillar is erected in this pit, fixed on a foundation or a foundation pile at the bottom of the pit, and the periphery thereof is filled with sand or the like and backfilled. At that time, a erection stand is installed at the upper end of the pit, and a trussed pillar is erected in the pit through this pedestal. Do.

[0005]

However, in such a method of building a timber column, the timber column is excavated and then the timber column is built. Efficient construction is not always possible because it is necessary to backfill the perimeter of the pillar.

In addition, since the pit is excavated to a large size, even if the alignment of the trussed pillar can be performed accurately, the pillar core is displaced or tilted when the surroundings are backfilled, and the vertical accuracy is reduced. In some cases, excavating a large pit requires a large amount of excavated soil and requires extra cost for the treatment.
Furthermore, since it is necessary to separately manufacture the mounting stand, there is a problem that the cost is further increased in this respect.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a method of constructing a trussed pillar in which the trussed pillar can be built very efficiently and with high precision. I do.

[0008]

According to a first aspect of the present invention, there is provided a method of constructing a straight pillar according to the present invention, comprising constructing a gantry at a predetermined height and penetrating the gantry. The trussed pillars are erected, and at least two vertical positions are supported under the gantry. After the trussed pillars are positioned, they are built in the ground.

According to a second aspect of the present invention, there is provided a method of constructing a straight pillar according to the first aspect, wherein a plurality of telescopic support arms are installed under the gantry, and the plurality of support arms are used to extend the vertical direction of the straight pillar. At least two places are supported, and the vertical column is positioned.

According to a third aspect of the present invention, there is provided a method of constructing a straight pole according to the first or second aspect, wherein an excavator is mounted on a gantry, and the excavator excavates a vertical shaft. Build a pillar.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 6 show an example of a construction method of a straight pillar according to the present invention. In the drawings, a gantry 1 is constructed at a predetermined height on the ground of a site. An excavator 2 is mounted thereon.

In addition, a steel column 3 made of a steel pipe is pierced through the floor 4 of the gantry 1 at a position where the main column of the building to be constructed is constructed. In the figure, in particular, a steel pipe with an outer surface projection having a plurality of ribs on the outer surface is built as the straight pillar 3. In addition, the tall pillar here means a part which becomes a pile foundation.

The trussed column 3 is vertically built along the leader 5 of the excavator 2, and the trussed column 3 has a plurality of support arms 6 whose portions below the floor 4 of the gantry 1 are extensible by hydraulic pressure or the like. Are supported from all sides by the frame member 7 of the gantry 1 through the base.

At this time, the support arms 6 are radially installed between the straight pillar 3 and a plurality of surrounding frame members 7 from the straight pillar 3 side to the surrounding frame member 7 side. 3 are installed in two or more stages so as to support at least two places in the vertical direction.

Although the supporting arms 6 are installed in two stages in the figure, the supporting arms 6 may be installed in three stages or more especially when the gantry 1 is high. The support arm 6 is formed, for example, by protruding a holding ring 9 for holding the straight pillar 3 from right beside the piston rod 8 a of the hydraulic cylinder 8.

The gripping ring 9 has a circular or rectangular shape corresponding to the shape of the straight pillar 3, and is attached to the distal end of the piston rod 8a by screwing with a mounting screw 10. At this time, the holding ring 9 is rotated to some extent in the vertical direction about the mounting screw 10 so that the horizontal error of the support arm 6 due to the inclination of the shaft assembly 7 or the like can be absorbed.

The gripping ring 9 is composed of a plurality of parts 9a divided into parts in the circumferential direction, and is formed into a circular or rectangular ring by connecting the plurality of parts 9a to each other by connecting screws 11. ing. In the figure, 2
A grip ring 9 is formed from the individual parts 9a.

The excavator 2 includes a rotating rod (auger rod) 12 hanging down along the leader 5 and the rotating rod 12.
Excavation blade 13 and stirring blade 14 and co-rotation prevention blade 15
The rotating rod 12 penetrates the straight pillar 3, and the excavating blade 13 and the stirring blade 14 penetrate the inside of the straight pillar 3 and protrude from the lower end of the straight pillar 3.

The rotating rod 12 includes a rotating rod 12.
The stabilizers 16 are provided at predetermined intervals so as to be vertically supported in the vertical columns 3 so that the pits can be dug vertically (see FIG. 3).

The stirring blade 14 rotates together with the rotary rod 12 and excavated soil excavated by the drilling blade 13 and the rotary rod 1.
2 is to stir and mix with the solidified material such as cement milk injected into the ground from the tip of 2. The anti-corotating wing 15 is stopped in the excavated soil to prevent co-rotation of the excavated soil. It enhances the stirring and mixing of excavated soil and cement milk.

Both the stirring blade 14 and the co-rotation prevention blade 15 are attached to the tip of a rotating rod 12 that penetrates the vertical shaft 3 and whose lower end protrudes a predetermined length from the lower end of the vertical shaft 3. When the rotating rod 12 is pulled out, the shaft 3
It is attached so as to close and close (to be vertically attached to the rotating rod 12) so as to pass through the inside smoothly.

In such a configuration, the construction method of the straight pillar according to the present invention will be described in order. When the above-mentioned arrangement is completed, first, the plurality of support arms 6 are operated, and the trussed pillar 3 is appropriately moved horizontally back and forth and left and right to form the pillar core of the trussed pillar 3. To the pillar core. Next, the excavator 2 is driven, and the excavation blade 13 and the stirring blade 4 are rotated via the rotating rod 12 to excavate the pit 17. At the same time, while the solidified material is injected into the excavated soil from the tip of the rotating rod 12, the solidified material and the excavated soil are carefully agitated and mixed by the stirring blade 14 and the co-rotation prevention wing 15, thereby excavating the shaft 17. A soil cement consisting of soil and solidified material is formed.

Further, the excavated soil and the solidified material are stirred and mixed while excavating the pit 17, and the shaft 3 is gradually pushed into the soil cement in the pit 17. At this time, when the timber pillar 3 is to be built deep, the necessary number of the rotating rods 12 and timber pillars 3 are connected. When the straight pillar 3 can be erected to the set position in this way, the stirring blade 14 and the co-rotation preventing blade 15 are closed.
Then, while rotating the rotating rod 12 in the reverse direction, the inside of the vertical shaft 3 is pulled up and removed. When the construction of the pillar 3 is completed, a steel frame 18 on the upper floor is constructed from the top of the pillar 3 to construct the ground floor, and at the same time, the underground floor is cut off, and the floor is lowered from the ground to the lower floor. Build the basement floor in order.

FIGS. 7 and 8 show a case where the timber pillar 3 is erected on the ground surface which is cut to a certain depth. Other arrangements of the pile are substantially the same as those shown in FIGS.

FIG. 9 particularly shows that the bearing 20 is attached to the inside of the holding ring 9 for holding the straight pillar 3 so that the friction between the holding ring 9 and the straight pillar 3 is eliminated. It is designed to be pushed into the hole 17 so that it can be built smoothly.

[0026]

The present invention has the above-described structure,
In particular, trussed pillars are not built after excavating pits,
Since it is built at the same time as the excavation of the pit, the timber pillar can be built very efficiently.

In addition, since the truss pillar is supported under the gantry at at least two positions in the vertical direction by a plurality of telescopic support arms and the support arm positions the truss pillar, Construction and alignment can be performed very accurately and easily.

Further, since the excavated soil is not actively discharged to the ground, but is stirred and mixed with the solidified material to form soil cement in the pit, the amount of excavated soil is extremely small and the construction cost is greatly reduced. Can also be planned.

[Brief description of the drawings]

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a side view showing a construction method of a straight pillar.

FIG. 2 is a side view showing a construction method of a straight pillar.

3 (a) to 3 (f) are cross-sectional views showing steps of a construction method of a straight pillar.

FIG. 4 is a cross-sectional view under a gantry showing a method of supporting a timber column.

FIG. 5 is a cross-sectional view under a gantry showing a method of supporting a straight pillar by a support arm.

FIG. 6 is a cross-sectional view under a gantry showing a method of supporting a straight pillar by a support arm.

FIG. 7 is a side view showing a construction method of a straight pillar.

FIG. 8 is a side view showing a construction method of a straight pillar.

FIG. 9 is a cross-sectional view under a gantry showing a method of supporting a straight pillar by a support arm of another example.

[Explanation of symbols]

 Reference Signs List 1 gantry 2 excavator 3 truss pillar 4 gantry floor 5 excavator leader 6 support arm 7 gantry frame material (for example, column) 8 hydraulic cylinder 8a piston rod 9 gripping ring 9a parts forming gripping ring 10 Mounting Screw 11 Mounting Screw 12 Rotating Rod (Auger Rod) 13 Drilling Wing 14 Stirring Wing 15 Co-rotation Prevention Wing 16 Stabilizer 17 Vertical Hole 18 Steel Structure on Upper Floor than Vertical Pillar 19 Piling Piles 20 Bearing

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeru Yoshida 6-13-7 Akasaka, Minato-ku, Tokyo Tenox Co., Ltd. F-term (reference) 2D047 AB04 2D050 AA06 CB06 CB08 EE03 EE18

Claims (3)

[Claims] 1. A gantry is constructed at a predetermined height, a truss pillar is erected through the gantry, and at least two vertical positions are supported under the gantry. A method of constructing a straight pillar, which is built in the ground after positioning. 2. A method according to claim 1, wherein a plurality of telescopic support arms are provided under the gantry, and the plurality of support arms support at least two positions in the vertical direction of the truss pillar and position the truss pillar. The construction method of a straight pillar according to claim 1, characterized in that: 3. An excavator mounted on a gantry, wherein the excavator excavates the pit and erected a trussed pillar in the pit. Construction method.