JP2022137952A - Construction method of eccentric substructural column - Google Patents

Abstract

To erect a lower straight column part at such an erection depth that an upper end is positioned at a deep depth exceeding a maximum depth of a pile follower, and erect an eccentric substructural column in which an installation depth of a boundary part between the lower straight column part and an upper eccentric column part is set at a depth exceeding the maximum depth of the pile follower.SOLUTION: A construction method of an eccentric substructural column 1 for erecting an eccentric substructural column 1 in which an upper eccentric column part is planarly deviated from a lower straight column part 11 into the ground includes: a lower straight column part erecting step of connecting a straight extension straight column part 4 to an upper end of the lower straight column part 11, connecting a pile follower 3 to the upper end of the connected lower straight column part 11, and erecting the lower straight column part 11 together with the extension straight column part 4; and an upper eccentric column part erecting step of removing the extension straight column part 4 connected to the upper end of the lower straight column part 11, erecting the upper eccentric column part, and connecting it to the upper end of the lower straight column part 11, after execution of the lower straight column part erecting step.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a construction method for an eccentric column in which an eccentric column whose upper eccentric column is displaced from the lower straight column is erected in the ground.

In Patent Document 1, an upper eccentric column (upper portion 2A in an oblique posture) is larger in diameter than a vertical hole formed by an earth drilling method with respect to a lower straight column (lower portion 2B in a vertical posture). A lower straight column that forms a vertical hole and erects a lower straight column (lower part 2B) when erecting an eccentric structure column (bent column 2) that is displaced in a plane due to eccentricity in the ground. After execution of the lower straight column portion erecting step and the lower straight column portion erecting step, a wider range than the vertical hole is excavated to erect the upper eccentric column portion (upper portion 2A) and lower straight column portion (lower portion 2B ) and an upper eccentric post erection step connected to the upper end of ).

When the lower straight column part is erected in the ground first, generally, a general-purpose hook (hanging jig) is used to place the upper end part in the ground or in the water, and the lower straight column is By connecting to the upper end of the column and dropping the lower straight column into a vertical hole excavated in the ground with a crane, the lower straight column reaches a depth deeper than the ground surface within the maximum depth of Yatco. The lower straight column part is erected at the erection depth where the upper end is located.

Japanese Patent No. 6119074

However, in the above-described conventional construction method, the lower straight column cannot be erected at a depth where the upper end of the lower straight column is located at a depth exceeding the maximum depth of Yatco. It is not possible to erect an eccentric structure column whose installation depth at the boundary of the upper eccentric column is set to a depth exceeding the maximum depth of Yatko.

In view of this fact, the main object of the present invention is to enable the lower straight column portion to be erected at a depth in which the upper end is located at a deeper depth than the maximum depth of the yatko, and the lower straight column portion and the upper eccentric column. To provide a method for constructing an eccentrically constructed column, which is capable of erecting an eccentrically constructed column in which the installation depth of the boundary portion of a section is set to a depth exceeding the maximum depth of Yatco.

A first characteristic configuration of the present invention is a construction method for an eccentric column in which an eccentric column in which an upper eccentric column is displaced in a plane with respect to a lower straight column is erected in the ground,
A linear extended straight pillar is connected to the upper end of the lower straight pillar, and a jack is connected to the upper end of the connected extended straight pillar to build the lower straight pillar together with the extended straight pillar. A lower straight column part erection process to insert,
After executing the lower straight column portion erecting step, the extended straight column portion connected to the upper end portion of the lower straight column portion is removed, and the upper eccentric column portion is erected to form the upper end portion of the lower straight column portion. and an upper eccentric column portion erecting step connected to.

According to this configuration, in the step of erecting the lower straight pillar, the straight extended straight pillar is connected to the upper end of the lower straight pillar, and the upper end of the extended straight pillar is connected to the extended straight pillar. By dropping the lower straight column together with the column into a vertical hole excavated in the ground by a crane, the upper end is located at the extension depth that is the maximum depth of Yatco plus the length of the extended straight column. The lower straight column part can be erected with the embedded depth.
Then, in the subsequent upper eccentric column portion erecting step, the extended straight column portion connected to the upper end portion of the lower straight column portion is removed, and the upper eccentric column portion is erected and connected to the upper end portion of the lower straight column portion. By doing so, the eccentric structural column can be built into the ground.
Therefore, the lower straight pillar can be erected to a depth where the upper end is located at a deeper depth than the maximum depth of YATCO, and the installation depth of the boundary between the lower straight pillar and the upper eccentric pillar is YATCO's. Eccentric columns set at depths greater than the maximum depth can be erected.

A second characteristic configuration of the present invention is that, in the step of erecting the lower straight column portion, the extension straight column portion is connected to the upper end portion of the lower straight column portion by a detachable connection means.

According to this configuration, in the step of erecting the lower straight column portion, the extended straight column portion is connected to the upper end portion of the lower straight column portion by a detachable connection means such as a bolt connection, so that the upper eccentric column portion can be erected later. The extension straight column portion can be easily removed from the upper end portion of the lower straight column portion in the installation process, and construction can be performed efficiently.

In the third characteristic configuration of the present invention, in the lower straight column portion erecting step, a vertical hole is formed in the ground, and after the lower straight column portion is dropped into the vertical hole together with the extended straight column portion backfilling the vertical hole;
In the upper eccentric column portion erecting step, a widened vertical hole portion wider than the vertical hole portion is excavated, the extended straight column portion is removed, and the upper eccentric column portion is installed in the widened vertical hole portion. It is at the point of dropping.

According to this configuration, in the lower straight column erecting step, the vertical hole is excavated in the ground, the lower straight column is dropped into the vertical hole together with the extended straight column, and then the vertical hole is backfilled. , the lower straight column portion can be properly erected to a predetermined erection depth.
Then, in the upper eccentric column part erection process, a widened vertical hole that is wider than the vertical hole is excavated and formed, the extended straight column part is removed, and the upper eccentric column part is dropped into the widened vertical hole part. , the upper eccentric column that is displaced from the lower eccentric column can be properly erected.

Side cross-sectional view schematically showing the process of erecting the lower straight column part Cross-sectional side view schematically showing the upper eccentric column erection process A diagram schematically showing a connecting portion between a lower straight column portion and an extended straight column portion.

An embodiment of the present invention will be described based on the drawings.
As shown in FIG. 2(c), when constructing a building by the reverse construction method, the present invention provides an eccentric structure made of steel or the like in which the upper eccentric column portion 12 is displaced from the lower straight column portion 11 in a plane. This is a method of constructing an eccentric structure true pillar 1 in which the true pillar 1 (eccentric lower pillar) is erected in the ground G.

The lower straight column portion 11 is a column portion extending in the vertical direction, and the upper eccentric column portion 12 includes a lower diagonal portion 12A extending in an oblique direction that is inclined with respect to the vertical direction, and a vertical direction extending from the upper end of the oblique portion 12A. It is a column portion having an upper vertical portion 12B extending to the upper side.

The maximum width W1 (width in the eccentric direction) of the eccentric structure column 1 is the vertical hole 2 (see FIG. 1(b)) excavated and formed by the earth drill method in which a drilling bucket of an excavator is rotated. It is larger than the diameter W2, and the installation depth of the boundary portion between the lower straight column portion 11 and the upper eccentric column portion 12 in the eccentric structure column 1 is a depth D1 ( (see FIG. 2(c)).

Therefore, in the construction method of this eccentric structure column 1, as shown in FIG. is connected to the upper end of the lower straight column 11, and the Yatco 3 is connected to the upper end of the connected extended straight column 4 to erect the lower straight column 11 together with the extended straight column 4. As shown in FIG. 2, after the lower straight column portion erecting step is executed, the extended straight column portion 4 connected to the upper end portion of the lower straight column portion 11 is removed, and the upper eccentric column portion 12 is removed. An upper eccentric column portion erecting step of erecting and connecting to the upper end portion of the lower straight column portion 11 is executed in order. Each step will be described in detail below.

(lower straight column part erection process)
1(a) and 1(b), in this lower straight column portion erecting step, the straight extension straight column portion 4 made of steel is aligned with the upper end portion of the lower straight column portion 11. In addition, the steel yattko 3 is aligned with the upper end portion of the extended straight column portion 4 so as to be aligned with the axis. At this time, the extension straight column portion 4 is connected to the upper end portion of the lower straight column portion 11 by a detachable connecting means 5 .

For example, as schematically shown in FIG. It can be composed of an erection piece 52 projecting from a plurality of locations on the outer peripheral surface, and a plurality of connecting plates 53 or the like detachably connecting the upper and lower erection pieces 51 and 52 with bolts/nuts 54 or the like. It should be noted that the connection of the yattco 3 to the upper end portion of the extended straight column portion 4 is also performed by a detachable connection means similar to the connection means 5 described above.

Further, as shown in FIG. 1(b), a vertical hole portion 2 is formed by drilling the ground G at the location where the ground is to be built by an earth drilling method in which a drilling bucket of an excavator is rotated. Although not shown, a surface layer casing having a circular cross section or the like is installed above the vertical hole 2, and the inside of the vertical hole 2 is filled with a stabilizing liquid or the like for protecting the hole wall.

Then, concrete (framework pillars) 6 is placed on the lower side of the vertical hole 2, and before the concrete 6 hardens, the lower straight pillars together with the extended straight pillars 4 are moved by the crane 7 via the jack 3. 11 into the vertical hole portion 2, the built-in depth is such that the upper end is located at the depth D1 (corresponding to the extended depth) obtained by adding the length of the extended straight column portion 4 to the maximum depth D3 of the Yatco 3. The lower straight column part 11 is erected. After that, as shown in FIG. 1(c), the yattko 3 is removed from the upper end portion of the extended straight column portion 4, and the vertical hole portion 2 is backfilled.

(Upper Eccentric Column Installation Process)
In the upper eccentric column erecting step that is executed following the lower straight column erecting step, as shown in FIG. 2A, the vertical hole 2 formed in the lower straight column erecting step is widened. The widened vertical hole 8 is excavated by a deep foundation construction method in which manpower or an auxiliary excavator is used.

A diameter W8 of the widened vertical hole portion 8 is set larger than the maximum width W1 of the eccentric structure column 1 . Further, the depth D8 of the widened vertical hole portion 8 is such that a predetermined length of the upper end side of the lower straight column portion 11 is exposed so that the lower straight column portion 11 and the upper eccentric column portion 12 can be efficiently connected. set to depth.
Although not shown, a liner plate or the like for retaining earth is installed on the inner surface of the widened vertical hole portion 8 .

After that, as shown in FIG. 2(b), the extended straight column portion 4 is removed from the upper end portion of the lower straight column portion 11 and removed. Then, the upper eccentric column portion 12 is dropped into the widened vertical hole portion 8 by the crane 7, and the lower end portion of the upper eccentric column portion 12 and the upper end portion of the lower straight column portion 11 are connected by connecting means such as welding, The widened vertical hole portion 8 is backfilled.
In this way, the installation depth of the boundary between the lower straight column portion 11 and the upper eccentric column portion 12 is set to a depth D1 that exceeds the maximum depth D3 (see FIG. 1(b)) of the eccentric column 1. can be built into the ground G.

[Another embodiment]
Another embodiment of the present invention will be described. It should be noted that the configuration of each embodiment described below is not limited to being applied alone, and can be applied in combination with the configurations of other embodiments.

(1) In the above-described embodiment, the lower straight column 11, the upper eccentric column 12, and the extended straight column 4 are made of steel. good too.

(2) In the above-described embodiment, the upper eccentric column portion 12 has a lower oblique portion 12A extending obliquely with respect to the vertical direction, and an upper vertical portion extending vertically from the upper end of the oblique portion 12A. Although the case of the column having the portion 12B is shown as an example, a column or the like extending in an oblique direction that is inclined with respect to the vertical direction as a whole may be used.

1 Eccentric structure column 2 Vertical hole 3 Yatko 4 Extension straight column 5 Connecting means 8 Widened vertical hole 11 Lower straight column 12 Upper eccentric column G Ground

Claims (3)

A method for constructing an eccentric column in which the upper eccentric column is displaced from the lower straight column in the ground, comprising:
A linear extended straight pillar is connected to the upper end of the lower straight pillar, and a jack is connected to the upper end of the connected extended straight pillar to build the lower straight pillar together with the extended straight pillar. A lower straight column part erection process to insert,
After executing the lower straight column portion erecting step, the extended straight column portion connected to the upper end portion of the lower straight column portion is removed, and the upper eccentric column portion is erected to form the upper end portion of the lower straight column portion. A method of constructing an eccentric structure column, comprising: 2. The method of constructing an eccentric column according to claim 1, wherein in said lower straight column erecting step, said extended straight column is connected to the upper end of said lower straight column by a detachable connecting means. In the lower straight pillar portion erecting step, a vertical hole is formed in the ground, and the lower straight pillar portion is dropped into the vertical hole together with the extended straight pillar portion, and then the vertical hole portion is backfilled;
In the upper eccentric column portion erecting step, a widened vertical hole portion wider than the vertical hole portion is excavated, the extended straight column portion is removed, and the upper eccentric column portion is installed in the widened vertical hole portion. The method for constructing an eccentric column according to claim 1 or 2, wherein the column is dropped.

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