JP2001317039A - Reinforcing member of improved column body and manufacturing method of improved column body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a means for preventing cracks or chips occurring in the vicinity of the circumferential edge of the upper end of an improved column body. SOLUTION: A reinforcing member 100 of the improved column body is a cylindrical member provided to the improved coluu body 1 for reinforcing the neighborhood of the circumferential edge of the upper end 11 of the columnar improved column body 1 formed in the ground below a footing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing member used for an improved column for increasing the ground support force.

[0002]

2. Description of the Related Art Generally, when a house or the like is constructed on soft ground, a solidified material slurry such as cement and earth and sand are mixed and hardened in the ground as shown in FIG. 11 (a). A ground improvement method for improving the bearing capacity of the ground by constructing a plurality of improved pillars 1 is performed. As shown in FIG. 11 (b), in order to improve the supporting force per one piece of the improved pillar 1, the improved pillar has a joint 1 having a larger outer diameter than the body 13 thereof.
There is also a ground improvement method for constructing an improved columnar body 1a provided with a plurality of joints 4.

[0003] The improved columnar member 1a has a greater frictional force with the ground than the ordinary improved columnar member 1 and an increased supporting force, as much as the node portion 14 protrudes from the body portion 13. For this reason, the number of the improved pillars to be constructed can be reduced, and the length of the improved pillars can be shortened.

FIG. 12 is a plan view for explaining the arrangement of the improved column 1 with respect to the cloth foundation 2. In the figure, a hatched circle on the cloth foundation 2 forms the improved column 1. The position to be indicated. As shown in the figure, the improved pillars 1 are arranged in a well-balanced manner directly under the cloth foundation 2 and support loads such as the own weight of the house.

[0005]

However, the upper end of the improved column 1 is compressed by receiving a vertical load due to the own weight of the house, earthquake, snow, or the like, or is deteriorated by deterioration of a solidified material such as cement. In some cases, cracks or chips may occur near the periphery of the upper end. Such cracks and chips may cause a reduction in the supporting force that the improved column should originally exhibit. The present invention has been made in view of the above points, and an object of the present invention is to provide a means for preventing cracks or chips occurring near the periphery of the upper end of an improved column.

[0006]

According to a first aspect of the present invention, there is provided a reinforcing member for a column, wherein the reinforcing member is a columnar column formed in the ground below a foundation. In order to reinforce the vicinity of the periphery of the upper end of the body, it is a reinforcing member of the improved pillar provided in the improved pillar, the reinforcing member,
The inner peripheral surface is a cylinder which is in close contact with the side surface of the upper end of the improved column, and whose outer peripheral surface is substantially flush with the side surface of the improved column.

According to a second aspect of the present invention, in the reinforcing member of the first aspect, the reinforcing member is an annular flat plate which is in close contact with an upper surface of an upper end portion of the improved column. , Provided at the upper end of the cylinder.

According to a third aspect of the present invention, there is provided the reinforcing member of the improved column, wherein the annular flat plate has a peripheral edge projecting from an outer peripheral surface of the cylinder. is there.

According to a fourth aspect of the present invention, there is provided an improved method for manufacturing a column, wherein a ground on which a foundation is to be disposed is excavated in a columnar shape, and earth and sand and a solidified material slurry are mixed into the excavated ground. An improved soil preparation step for preparing soil, and before the improved soil is solidified, the reinforcing member of the improved column according to any one of claims 1 to 3, wherein the upper end of the cylinder has an upper surface of the improved column. And a solidifying step of solidifying the improved soil by press-fitting into the improved soil until the same flat surface is obtained or until the annular flat plate is in close contact with the upper surface of the improved column.

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic perspective view for explaining the configuration of the reinforcing member of the improved column according to the first embodiment of the present invention. As shown in the figure, the reinforcing member 100 of the improved column is used to reinforce the vicinity of the periphery of the upper end 11 of the column-shaped improved column 1 built in the ground below the foundation. 1 is a cylinder provided.

FIG. 2 shows a reinforcing member 100 of the improved pillar.
FIG. 2 is a cross-sectional view showing a state in which the reinforcing member 100 of the improved column 1 is attached to the improved column 1. As shown in FIG. The outer peripheral surface is in close contact with the side surface of the portion 11 and the side surface 1 of the improved pillar 1
2 is substantially the same plane. This prevents the vicinity of the upper end 11 of the improved column 1 from being compressed by receiving a load in the vertical direction and expanding in the horizontal direction. In addition, the material of the reinforcing member 100 of the improved pillar is not particularly limited, but it is necessary that the reinforcing member 100 has sufficient strength to prevent the upper end 11 of the improved pillar 1 from expanding. Metals such as steel, hard plastics, reinforced plastics and the like can be used.

As described above, according to the reinforcing member 100 of the improved column according to the present embodiment, the inner peripheral surface of the cylinder is in close contact with the side surface of the upper end 11 of the improved column 1,
Since the upper end 11 of the improved column 1 is prevented from being compressed by receiving a load in the vertical direction and expanding in the horizontal direction, cracks or chips near the periphery of the upper end 11 of the improved column 1 may be prevented. Can be prevented. In addition, since the outer peripheral surface of the reinforcing member 100 of the improved pillar is substantially flush with the side surface 12 of the improved pillar 1, the reinforcing member 100 can be easily replaced with the improved pillar irrespective of the hardness of the ground. It can be arranged at the upper end 11 of the body 1.

Hereinafter, a second embodiment of the present invention will be described. FIG. 3 is a schematic perspective view for explaining the configuration of the reinforcing member of the improved column according to the second embodiment of the present invention. As shown in FIG.
The upper end 1 of the improved column 1 is attached to the upper end of the cylinder 21 which is in close contact with the side surface of the upper end 11 of the improved column 1 on its inner peripheral surface.
1 is provided with an annular flat plate 22 that is in close contact with the upper surface. The annular flat plate 22 has an outer diameter substantially the same as the outer diameter of the cylinder 21, and is fixed to the upper end of the cylinder 21.

FIG. 4 shows a reinforcing member 200 of the improved column.
FIG. 2 is a cross-sectional view showing a state in which the reinforcing member 200 is attached to the improved column 1. As shown in the drawing, a reinforcing member 200 of the improved column has a side surface of the upper end 11 of the improved column 1 having a convex cross section. The inner peripheral surface of the cylinder 21 is provided in close contact with the flat plate 22, and the flat plate 22 is provided in close contact with the upper surface of the upper end 11 of the improved column 1. In addition, the outer peripheral surface of the cylinder 21 is
Are substantially the same. Thereby, the improved pillar 1
Is prevented from being compressed by receiving a load in the vertical direction and expanding in the horizontal direction. In addition, the material of the reinforcing member 200 of the improved column is not particularly limited as described above, and may be integrally formed of a synthetic resin or the like.

As described above, according to the improved columnar reinforcing member 200 according to the present embodiment, the inner peripheral surface of the cylinder 21 and the flat plate 22 are in close contact with the upper end portion 11 of the improved columnar body 1, thereby improving the structure. Since the upper end 11 of the column 1 is prevented from being compressed by receiving a load in the vertical direction and expanding in the horizontal direction, cracking or chipping is prevented near the periphery of the upper end 11 of the improved column 1. can do. Further, since the outer peripheral surface of the cylinder 21 is substantially flush with the side surface 12 of the improved column 1, the reinforcing member 200 can be easily attached to the upper end of the improved column 1 regardless of the hardness of the ground or the like. It can be arranged in the part 11.

Next, a modified example of the second embodiment will be described. FIG. 5 is a schematic perspective view for describing a configuration of a reinforcing member of an improved column according to a modification of the second embodiment. As shown in FIG.
00a is a cylinder 2 at the upper end of the cylinder 21
An annular flat plate 23 protruding from one side face is fixed.

FIG. 6 shows a reinforcing member 200a of the improved pillar.
Is a cross-sectional view showing a state in which the reinforcing member 200a is attached to the improved column 1.
The inner peripheral surface of the cylinder 21 is in close contact with the side surface of the upper end 11 of the improved column 1 having a convex cross section, and the flat plate 23 is in close contact with the upper surface of the upper end 11 of the improved column 1 and the ground surface. It is provided to be. Thereby, the upper end 11 of the improved column 1
Are compressed under the load in the vertical direction and are prevented from expanding in the horizontal direction. Further, a ground reaction force acts on the flat plate 23 to reduce the vertical load to be supported by the improved column 1. In addition, the material of the reinforcing member 200a of the improved column is not particularly limited as described above, and may be integrally formed of synthetic resin or the like.

As described above, according to the reinforcing member 200a of the improved column according to the present modification, the inner peripheral surface of the cylinder 21 and the flat plate 23 are in close contact with the upper end portion 11 of the improved column 1 and the flat plate 23 By contacting the ground surface, the vicinity of the upper end 11 of the improved column 1 is compressed by receiving a load in the vertical direction and is prevented from expanding in the horizontal direction, and a ground reaction force acts on the flat plate 23. Then, the vertical load to be supported by the improved column 1 is reduced, so that the vertical load to be supported by the improved column 1 can be reduced in addition to the effect described in the second embodiment.

Hereinafter, a method of manufacturing an improved column using the reinforcing member 200 for the improved column according to the second embodiment will be described with reference to FIGS. First, an improved soil preparation step, i.e., a step of excavating the ground on which the foundation of a building such as a house is to be provided in a cylindrical shape, and then mixing the soil in the ground with a solidifying material slurry such as cement to prepare an improved soil. Is performed. Excavation of the ground and preparation of the improved soil are performed using a ground improvement stirrer 3 as shown in FIG. As shown in the figure, the ground improvement stirrer 3 is provided with a drilling head 32 for excavating or stirring the ground, a stirring blade 33, and the like on a rotary shaft 31, and a support 5 fixed by a construction machine 4 or the like. The solidified material slurry obtained by kneading water and a solidified material such as cement by the mixer 6 is pumped to the ground improvement stirrer 3 by the pump 7, and is discharged from the tip of the rotating shaft 31. It is configured to be rotated by an appropriate drive source 8.

As shown in FIG. 8A, first, after the ground improvement stirrer 3 is positioned, the ground is dug by the drilling head 32 and the stirring blades 33 while rotating the rotating shaft 31 (S1). ). After the drilling head 32 of the ground improvement stirrer 3 reaches the set depth, the rotating shaft 31 is rotated while the solidified material slurry is discharged from the tip of the rotating shaft 31 as shown in FIG. The ground improvement stirrer 3 is pulled up while being left (S2). Thereby, the earth and sand and the solidified material slurry are mixed and stirred by the rotation of the stirring blade 33, and the improved soil is produced.

Next, as shown in FIG. 9, before the improved soil is solidified, the reinforcing member 200 of the improved column is separated from the upper surface of the improved column 1 by the annular flat plate 22. The step of press-fitting until close contact is performed (S3). Since the outer peripheral surface of the cylinder 21 of the reinforcing member 200 of the improved columnar body is substantially flush with the side surface 12 of the improved columnar body 1, the solidified member before solidification does not receive resistance from the unexcavated ground. It can be easily pressed into soft and improved soil. Thereby, the upper end portion 11 of the improved column 1 is formed to have a convex sectional shape, and the reinforcing member 200 is connected to the improved column 1.
Is disposed at the upper end 11 of the first member. It is desirable that the reinforcing member 200 of the improved column be press-fitted until the flat plate 22 is substantially flush with the ground surface, and that when the surplus improved soil is pressed out from the hole of the annular flat plate 22 at the time of press-fitting. Then, the improved soil is removed. Thereafter, as shown in FIG. 10, in the solidification step, the improved soil is solidified by being left in a state where the reinforcing step has been completed, and the improved column in which the reinforcing member 200 is disposed on the upper end portion 11. The body 1 is constructed (S4).

As described above, according to the present manufacturing method, after the improved soil is produced in the ground on which the foundation of the building is to be provided, before the improved soil is solidified, the reinforcing member 200 of the improved column is replaced with the circle. Since the annular flat plate 22 is pressed into the improved soil until the annular flat plate 22 is in close contact with the upper surface of the improved pillar 1, and then the improved soil is solidified, the reinforcing member 200 can be easily formed without waiting for the improved soil to solidify. It can be arranged at the upper end 11 of the improved column 1, and the improved column can be easily and quickly constructed.

In each of the above embodiments, each reinforcing member is provided at the upper end 11 of the columnar improved column 1. However, the upper end of the knotted improved column 1 a having a node is provided. Can be similarly arranged.

[0024]

As described above, according to the reinforcing member of the improved column according to the present invention, the inner peripheral surface is in close contact with the side surface of the upper end of the improved column, and the outer peripheral surface is the improved column. The upper surface of the improved column is compressed by receiving a load in the vertical direction and is prevented from expanding in the horizontal direction. Thereby, it is possible to prevent cracks and chips from being generated near the periphery of the upper end of the improved column. In addition, the reinforcing member can be easily provided at the upper end of the improved pillar regardless of the hardness of the ground.

Further, according to the present invention, the reinforcing member includes:
Since an annular flat plate that is in close contact with the upper surface of the upper end of the improved pillar is provided at the upper end of the cylinder, the same effect as described above can be obtained.

According to the present invention, the annular flat plate has a peripheral portion protruding from the outer peripheral surface of the cylinder, so that the same effect as described above can be obtained. The vertical load to be supported by the improved column can be reduced by receiving the ground reaction force at the peripheral edge of the column.

According to the method of manufacturing an improved column according to the present invention, the ground on which the foundation is to be disposed is excavated into a columnar shape,
An improved soil preparation step of preparing an improved soil by mixing earth and sand and a solidifying material slurry in the excavated ground, and the improvement according to any one of claims 1 to 3, before the improved soil is solidified. A reinforcing step of pressing the reinforcing member of the column into the improved soil until the upper end of the cylinder is flush with the upper surface of the improved column, or until the annular flat plate is in close contact with the upper surface of the improved column. And the solidifying step of solidifying the improved soil, so that the reinforcing member can be easily arranged at the upper end of the improved column without waiting for the solidification of the improved soil, and the improved column is simplified. And it can be constructed quickly.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view for explaining a configuration of a reinforcing member 100 of an improved column according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view for explaining a state in which a reinforcing member 100 of the improved column is attached to the improved column 1. FIG.

FIG. 3 is a schematic perspective view for explaining a configuration of a reinforcing member 200 of an improved pillar according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view for explaining a state in which a reinforcing member 200 of the improved column is attached to the improved column 1. FIG.

FIG. 5 is a schematic perspective view for explaining a configuration of a reinforcing member 200a of an improved pillar according to a modification of the second embodiment of the present invention.

FIG. 6 is a cross-sectional view for explaining a state in which a reinforcing member 200a of the improved column is attached to the improved column 1. FIG.

FIG. 7 is a schematic diagram for explaining equipment for manufacturing an improved column.

FIG. 8 is a schematic diagram for explaining an improved soil preparation step in a method for manufacturing an improved column.

FIG. 9 is a schematic diagram for explaining a reinforcing step in the method of manufacturing the improved column.

FIG. 10 is a schematic diagram for explaining a solidification step in the method for manufacturing an improved column.

FIG. 11 is a schematic diagram for explaining a configuration of an improved pillar 1 and a knotted improved pillar 1a.

FIG. 12 is a schematic diagram for explaining an arrangement of the improved column 1 with respect to the cloth foundation 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Improved column 100, 200, 200a Reinforcement member of improved column 11 Upper end part 12 Side surface 21 Cylinder 22, 23 Flat plate

Claims (4)

[Claims] 1. A reinforcing member for an improved column provided in an improved column to reinforce the vicinity of the upper edge of a column-shaped improved column built in the ground below a foundation. The improved column characterized in that the reinforcing member is a cylinder whose inner peripheral surface is in close contact with the side surface of the upper end of the improved column, and whose outer peripheral surface is substantially flush with the side surface of the improved column. Body reinforcement. 2. The reinforcing member according to claim 1, wherein an annular flat plate closely contacting an upper surface of an upper end portion of the improved pillar is provided at an upper end of the cylinder. Reinforcement members for improved pillars. 3. The reinforcing member according to claim 2, wherein the annular flat plate has a peripheral portion protruding from an outer peripheral surface of the cylinder. 4. An improved soil preparation step of excavating a ground on which a foundation is to be disposed in a columnar shape, and preparing an improved soil by mixing earth and sand and a solidifying material slurry in the excavated ground; Before the solidification, the reinforcing member of the improved columnar body according to any one of claims 1 to 3 is used until the upper end of the cylinder is flush with the upper surface of the improved columnar body, or its annular flat plate. A method of manufacturing an improved column, comprising: a reinforcing step of press-fitting the improved soil until it comes into close contact with the upper surface of the improved column; and a solidifying step of solidifying the improved soil.