JP2594724B2 - Construction method of trussed pillar - Google Patents

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 prefabricated pillar to be constructed prior to construction in order to form a beam for retaining a pillar or a beam frame when constructing a basement structure.

[0002]

2. Description of the Related Art Conventionally, in order to construct an underground structure, a steel column as a temporary or permanent construction is erected, and a cut-off girder or a raised material is temporarily provided as a temporary construction, and the ground is excavated. Then, as the root cutting progresses, the cutting beam is moved downward in two steps, 3
By gradually increasing the steps, it becomes possible to excavate the ground deeply.

Prior to the construction of a structure, a steel column is called a timber column, and is built during pile construction, followed by cutting beams and erection materials to construct a support frame for a retaining wall, and then performing the next excavation work Move to

[0004]

In such a conventional construction method, the timber pillar is built after the excavation of the pile work is completed, and then the concrete of the pile is driven. Therefore, the timber pillars that were accurately built after the excavation was completed,
It is very difficult to move the pile when placing the concrete, and it is very difficult to maintain the accuracy.In addition, the straight column directly above the pile is excavated to the ground surface with the same diameter as the pile diameter. However, there is an inconvenience that backfilling is required.

The present invention has been made to solve the above problems. An object of the present invention is to propose a method of constructing a straight pillar that is efficient in construction work and can ensure high installation accuracy.

[0006]

SUMMARY OF THE INVENTION Construction of a straight pillar according to the present invention
Method, construction methods der of構真columns Ken writes in the area prior to the construction of the basement floor structure is, first, from the tip of the ultra-high pressure jet stream
The triple pipe for the super jet that injects water is rotated to drill a vertical hole in the ground where the trussed pillar is to be built . Then,
Injecting a jet jet radially from the tip of the triple tube
At a given number of revolutions, number of repetitions, and pulling pitch,
While cutting the solidified part of the trussed pillar, the ground
Exhaust to the ground through the hole, spray hardener from the triple pipe,
Replacement of hardened material with cutting earth and sand to replace large-diameter columnar
Form a minute. Then, pull out the triple tube to the ground
Soil, water, and hardening in the pit
Fill the mixture of materials. On top of that, a shaft was excavated
Suspended from the above-mentioned pit, the tip of which is uncured
Ken put in, and you root hardened by the hardening of the root hardened part.

[0007]

[Function] In order to use pillars and beams built for temporary construction as main construction, make the pillar dimensions and accuracy as good as possible,
The beam is required to be of a length that can be reasonably joined to the pillar as a permanent construction.

In this construction method, a mixture (a mixture of soil, water and hardening material) substantially equal to the specific gravity of the ground is filled in a pit which is built by inserting a timber column, and the lower end portion is filled with the mixture. There is a rooted portion of a pillar made of hardened material mixed. Therefore, while the mixture in the pit and the consolidation part are soft, it is possible to secure a high-precision installation dimension only by suspending the straight pillar, standing vertically and allowing the consolidation part to harden. it can. Unlike the prior art, there is no possibility of lowering the installation accuracy due to movement due to concrete placement. In addition, the root consolidation part is cut using an ultra-high pressure jet jet, a hardening material is mixed and formed, and the vertical hole above it can be a small diameter that can be inserted through a straight column, so work efficiency can be reduced compared to conventional pile construction. Can be significantly increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given with reference to the illustrated embodiment. FIG.
5 show the construction of the embodiment in the order of steps. In FIG. 1, a triple pipe 1 for a super jet for jetting a super high pressure jet jet from a tip is rotated by a super jet method at a predetermined ground position, and a vertical hole 2 having a predetermined depth is formed.

Next, referring to FIG. 2, while jetting a jet stream in a radial direction from the tip of the triple tube 1, a predetermined rotation speed,
The rooted part of the pillar is cut with the number of repetitions and the pulling pitch. In FIG. 3, the required diameter and length are cut, and at the same time, the cut soil is discharged from the pit 2 to the ground, and the hardened material injected from the triple pipe 1 is mixed with the cut sand to form a large-diameter pillar-shaped straight pillar. The root consolidation part 3 is formed. While pulling out the triple pipe 1 on which the root consolidation portion 3 has been formed to the ground, a mixture 4 of soil, water and hardening material having substantially the same specific gravity as the ground remains in the vertical hole 2.

In FIGS. 4 and 5, a straight pillar 5 made of an H-shaped steel is suspended by passing through a vertical hole 2 filled with a soft mixture 4 and its tip is erected in an unhardened rooting part 3. Then, it is temporarily fixed with the jig 6 and left standing until the root stiffening portion 3 is hardened and the strength is developed. The trussed pillar 5 is fixed by the hardening of the root consolidation part 3, and the construction is completed.

FIG. 6 shows a ground 7 on which an underground structure is to be constructed.
By this construction method, four straight pillars 5 are built, and a continuous wall 8 serving as a mountain retaining is provided therearound. As shown in FIG. 7, a beam 9 is erected on the ground portion of the trussed pillar 5 in the same manner as in the conventional construction method, and the column / beam framing is used as a cutting beam for digging for excavating the ground.

According to the depth of the root cutting, as shown in FIG. 8, the beams 9 of the second stage or less are sequentially erected, and the ground is excavated to construct the underground structure.

In this embodiment, the drilling of the pit 2 and the formation of a large-diameter columnar root consolidation part mixed with a hardening material are carried out using a single apparatus by a super jet method utilizing an ultra-high pressure jet jet. The construction efficiency was further improved.

[0015]

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

Conventionally, since a timber column used as a temporary mounting for a mountain retaining structure can secure high-precision installation dimensions, the adjustment of the column-beam connection is simple and reliable, and the main column is installed as it is. -It can be used as a beam, improving economic efficiency.

[0017] The workability of building a timber column is significantly improved as compared with the conventional timber column construction with pile work. In addition, the construction of the above-ground part can proceed at the same time as the construction of the underground structure, improving productivity.

Since the timber is accurately built and supported as a permanent pillar of an underground structure, a girder cut beam for excavation can be attached to the timber pillar. In addition, the bolster portion forms a large-diameter body having a diameter of 5 m or more, and the foundation of the building can be placed thereon and supported.

[Brief description of the drawings]

The drawings show, in order, the construction process of the timber pillar and the construction process of the underground structure of the embodiment.

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

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

FIG. 3 is a perspective view showing a partial cross section of a step of mixing a hardening material to form a root compaction portion.

FIG. 4 is a perspective view showing a partial cross section of a process of erection of a straight pillar.

FIG. 5 is a perspective view showing a partial cross section of a process of building and buckling a timber pillar.

FIG. 6 is a cross-sectional view of a process in which a continuous wall is provided around four built-in straight pillars.

FIG. 7 is a sectional view of a process in which a beam is erected on a straight pillar to form a pillar / beam frame.

FIG. 8 is a cross-sectional view of a process in which a beam is erected on the second stage to form a column / beam frame.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Triple pipe for super jets, 2 ... Vertical hole, 3 ... Root consolidation part, 4 ... Mixed body, 5 ... Straight pillar, 6 ... Jig, 7 ... Ground,
8 ... continuous wall, 9 ... beam.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayoshi Nagata 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hiroshi Yoshida 2-9-1-1 Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Hikaru Sasao 2-9-1-1, Tobita-Shi, Chofu-shi, Tokyo Kashima Construction Co., Ltd. (72) Inventor Minoru Kobayashi 1-2-2 Moto-Akasaka, Minato-ku, Tokyo No. 7 Kashima Construction Co., Ltd. (72) Inventor Hiroaki Kubo 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Inside safety building Chemical Grout Co., Ltd. (72) Inventor Minoru Yamamoto 1-chome Moto-Akasaka, Minato-ku, Tokyo No. 6-4 Safety Bill Chemical Grout Co., Ltd. (72) Inventor Shunji Jimbo 1-6-4 Moto-Akasaka Minato-ku, Tokyo Safety Bill Chemical Grout Co., Ltd. In-house (72) Inventor Shigetaka Suzuki 1-6-4 Moto-Akasaka, Minato-ku, Tokyo Safety Building Chemical Grout Co., Ltd. (56) References JP-A-60-119818 (JP, A) JP-A-1-295913 (JP, A)

Claims (1)

(57) [Claims] 1. A method for constructing a timber pillar to be built in the ground prior to the construction of an underground floor structure, comprising: rotating a triple pipe for a super jet for jetting an ultra-high pressure jet jet from the tip.
Configuration Te and drilling the Tateana the ground to writing denominated the構真column, then a predetermined speed while injecting jet flow radially from the tip of the <br/> triple pipe, in number of repetitions, and pulling the pitch Along with cutting the solidified part of the true pillar, the cut soil is discharged from the pit into the ground, the hardening material is injected from the triple pipe, and this hardened material is replaced with the cut sand to replace the large-diameter columnar solidified part. formed, while pulling the triple pipe on the ground, said in Tateana is filled with mixture of approximately equal soil, water and a curing material as the ratio of the ground, further Tsukomi the構真column from the Tateana,
Construction methods of構真pillar, characterized in that the tip is placed denominated in the root consolidated portion of the uncured and roots solidified by curing of the root hardened portion.