JPH05156649A - Execution method for constructing structural stud - Google Patents

Abstract

PURPOSE:To enhance the efficiency of construction work and to secure high accuracy in building a structural stud into a foundation consolidation portion by inserting a pipe into a vertical hole drilled in the ground, and injecting a jet to the foundation consolidation portion of the and building the structural stud into the foundation consolidation portion. CONSTITUTION:A vertical hole 2 is bored by rotation of a triple pipe 1 and a jet is injected from the end of the triple pipe 1 to cut the bent root portion of a structural stud 5. Then a stiffener is injected from the triple pipe 1 and substitues for and mixes with drilled earth and sand to form the foundation consolidation portion 3 of the structural stud 5 and form a mix 4 of earth, water and the stiffener. After the triple pipe 3 has been pulled, the structural stud 5 made by an H-steel is suspended down to build its end portion into the unhardended foundation consolidation portion 3. The structural stud 5 is fixed by jigs until the foundation consolidation portion 3 hardens enough to provide strength. Thereby junction of columns and beams can easily and surely be adjusted and the columns and the beams can be directly used, whereby economicity can be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a structure column to be built prior to the construction, in order to construct a girder or the like for retaining the pillar / beam frame when constructing a basement structure.

[0002]

2. Description of the Related Art In order to construct an underground structure, steel pillars have been conventionally constructed as temporary construction or permanent construction, and a girder for retaining a mountain and a ventilating material as temporary construction are installed to excavate the ground. Then, as the root cutting progresses, the beam is moved downwards in two steps, 3
By gradually increasing the number of steps, it becomes possible to dig deep into the ground.

Steel columns are called structural columns, and they are built during the construction of piles prior to the construction of the structure, and then the beams and ponders are erected to construct the support frame for the mountain retaining wall and the next excavation work. Move to.

[0004]

In such a conventional construction method, the structure columns are built after the excavation of the pile work is completed, and then the concrete of the pile is driven. Therefore, the structure pillars that were built accurately after the excavation was completed,
It is very difficult to move and maintain the accuracy when placing concrete for piles, and the structural columns directly above the piles are excavated to the ground surface with the same diameter as the pile diameter. However, there was an inconvenience that it was necessary to backfill.

The present invention is intended to solve the above problems. The purpose is to propose a construction method for a construction pillar that is highly efficient in construction work and that can secure high installation accuracy.

[0006]

[Means for Solving the Problems] The present invention relates to a construction method for a structural pillar to be built underground before the construction of a basement structure,
A vertical hole is drilled in the ground where the structure column should be built, a pipe is inserted into this hole, and an ultra-high-pressure jet jet containing hardening material is injected to the root consolidation part of the structure column to cut the surrounding ground. Then, a large-diameter columnar root consolidation section mixed with a hardening material is formed, and the true column is hung from the vertical hole, and its tip is placed in the uncured root consolidation section, and the root consolidation section is hardened. This is a method of constructing a true pillar that is characterized by hardening.

[0007]

[Operation] In order to use the pillars and beams constructed for temporary construction as main construction, the installation dimensions and accuracy of the pillars should be as good as possible,
The beam is required to have a length that can be reasonably joined to the column as a permanent installation.

In this construction method, a mixture (soil, water and hardener mixture) having almost the same specific gravity as the ground is filled in the vertical hole inserted through the true structure column, and the lower end portion thereof is filled with the mixture. Has a solidified part of the structure pillar mixed with hardening material. Therefore, while the mixture in the pit and the root consolidation part are soft, the structure columns can be hung up and kept vertical and the root consolidation part can be hardened to ensure highly accurate installation dimensions. it can. Unlike in the past, the accuracy of construction will not be reduced due to movement such as placing concrete. In addition, the root consolidation part is cut by using an ultra-high pressure jet jet, mixed with hardened material to form it, and the vertical hole above it can be a small diameter to insert the true column, so work efficiency is higher than that of conventional pile construction. Can be significantly increased.

[0009]

Embodiments will be described below with reference to illustrated embodiments. Figure 1
5 to 5 show the construction of the example in the order of steps. In FIG. 1, a triple jet 1 for a super jet that jets a jet jet of ultra-high pressure is rotated from a tip end to a vertical hole 2 having a predetermined depth by a super jet method at a predetermined ground position.

Next, referring to FIG. 2, while jetting a jet jet from the tip of the triple pipe 1 in a radial direction,
Cut the root consolidation part of the true column with the number of repetitions and the pulling pitch. In FIG. 3, cutting the required diameter and length, simultaneously discharging the cutting earth and sand from the pit 2 to the ground, replacing and mixing the hardened material injected from the triple pipe 1 and the cutting earth and sand The root consolidation part 3 is formed. After forming the root consolidation part 3, the triple pipe 1 is pulled out to the ground. The vertical hole 2 is filled with a mixture 4 of soil, water, and a hardening material, which has almost the same specific gravity as the ground.

In FIGS. 4 and 5, an H-shaped structural column 5 is hung through a vertical hole 2 filled with a soft mixture 4 and the tip end thereof is erected in an uncured root consolidation part 3. Then, it is kept vertical, and the root fixing portion 3 is hardened and temporarily fixed by the jig 6 until the strength is developed, and then left still. When the root-hardening part 3 hardens, the true column 5 is fixed and the construction is completed.

FIG. 6 shows a ground 7 on which an underground structure is to be constructed,
With this construction method, four structural columns 5 are built, and a continuous wall 8 serving as a mountain retaining is provided around it. As shown in FIG. 7, a beam 9 is erected on the ground portion of the structure column 5 as in the conventional construction method, and the column / beam structure is used as a retaining beam for earth excavation.

According to the depth of root cutting, as shown in FIG. 8, a beam 9 of the second stage or lower is sequentially installed downward, and the ground is excavated to construct an underground structure.

In this embodiment, the formation of a large-diameter column-shaped root-hardening portion mixed with a hardened material and the drilling of the vertical hole 2 is carried out by a super jet method utilizing an ultra-high pressure jet jet using one device. However, it was possible to further improve the construction efficiency.

[0015]

The construction method of this structural pillar is as described above, and has the following effects.

[0016] Because it has become possible to secure a highly accurate installation dimension for the true-tooth column that has been used as a temporary structure for mountain retaining, the adjustment of the column-beam joint becomes simple and reliable, and the column of the main structure is maintained as it is.・ Because it can be used as a beam, the economy has improved.

The workability of erection of a true pillar is significantly improved as compared with the conventional construction of a true pillar with a pile work.

At the same time as the construction of the underground structure, the construction of the above-ground portion can proceed at the same time, and the productivity is improved.

[Brief description of drawings]

The drawings show, in order, the construction process of the structural columns and the process of constructing the underground structure of the embodiment.

FIG. 1 is a perspective view showing a partial cross section of a step of boring ground by a super jet method.

FIG. 2 is a perspective view showing a partial cross section of a step of cutting a root consolidation portion.

FIG. 3 is a perspective view showing a partial cross section of a step of forming a root-hardening portion by mixing a hardening material.

FIG. 4 is a perspective view showing a partial cross section of a process of erection of a true column.

FIG. 5 is a perspective view showing a partial cross section of the step of erection and consolidation of the true column.

FIG. 6 is a cross-sectional view of a process in which continuous walls are provided around four built-up false columns.

FIG. 7 is a cross-sectional view of a process in which a beam is erected on a true column to form a column / beam frame.

FIG. 8 is a cross-sectional view of a step in which a beam is installed in the second stage to form a pillar / beam structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Triple tube for super jets, 2 ... Vertical holes, 3 ... Root fixing part, 4 ... Mixing body, 5 ... Structural pillar, 6 ... Jig, 7 ... Ground,
8 ... Continuous wall, 9 ... Beam.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masatoshi Nagata 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hiroshi Yoshida 2--19-1, Tobita, Chofu-shi, Tokyo No. Kashima Construction Co., Ltd. Technical Research Institute (72) Inventor Hikaru Sasao 2-19-1, Tobita-cho, Chofu-shi, Tokyo Kashima Construction Co., Ltd. Technical Research Laboratory (72) Inventor Minoru Kobayashi 1-2-2 Moto-Akasaka, Minato-ku, Tokyo 7 Kashima Construction Co., Ltd. (72) Inventor Hiroaki Kubo 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Safety Building in Chemical Grout Co., Ltd. (72) Minoru Yamamoto 1-6, Moto-Akasaka, Minato-ku, Tokyo No. 4 Safety Building in Chemical Grout Co., Ltd. (72) Inventor Shunji Jimbo 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Safety Building Chemical Grout Co., Ltd. (72) Inventor Shigetaka Suzuki 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Safety Building, inside Chemical Grout Co., Ltd.

Claims (1)

[Claims] 1. A method of constructing a structure pillar to be built underground before the construction of a basement structure, in which a vertical hole is drilled in the ground where the structure pillar is to be built, and a pipe is installed in this vertical hole. Insert, inject a super-high pressure jet jet containing hardening material into the root consolidation portion of the structure column, cut the surrounding ground, form a large diameter columnar root consolidation part mixed with the curing material, and A method for constructing a structure pillar, which comprises suspending from a vertical hole, building a tip portion thereof into the uncured root-hardening portion, and hardening the root-hardening portion to harden the root.