JP2017008696A

JP2017008696A - Construction method for steel pipe pile foundation for being used in common for reduction in negative frictional force, ground compaction and the like

Info

Publication number: JP2017008696A
Application number: JP2015133903A
Authority: JP
Inventors: 一榮石井; Kazue Ishii
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-06-16
Filing date: 2015-06-16
Publication date: 2017-01-12

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for a steel pipe pile foundation for preventing liquefaction and consolidation settlement, in such a case that large construction machinery cannot be carried in.SOLUTION: Small construction machinery appropriate for a lot area is selected. A steel pipe foundation pile 1 is inserted to a predetermined depth by a welding joint when object ground is deep. Compression and consolidation are concurrently performed even in laminated ground by the concurrent use of compaction and forced drainage methods. The steel pipe foundation pile 1 serves not only as a pile but also as means capable of performing gravitational drainage.SELECTED DRAWING: Figure 1

Description

今後発生する地震に備え、液状化及び圧蜜沈下現象を前もって防止することを考慮し開発した工法である、新規に大規模に今後開発する場合は在来迄の各種地盤改良工法で良いが、小規模の場合、又は大型機械の搬入が困難な場合施工が困難でコスト高の要素が考えられるケースが多いので本工法を考案した。In preparation for earthquakes that will occur in the future, this method has been developed in consideration of preventing liquefaction and subsidence in advance.When newly developing on a large scale in the future, various conventional ground improvement methods may be used. This method was devised because there are many cases where construction is difficult and costly factors are considered when small-scale or large-scale machines are difficult to carry.

Technical background

軟弱な砂質系地盤あるいはシルト及び粘土層の粘性系地盤改良工法としては各種締固め工法、各種脱水、固化工法、強制排水工法があるがこれらの工

し、実施してきた背景があるThere are various compaction methods, various dewatering, solidification methods, and forced drainage methods for soft sandy soils or silt and clay layer viscous ground methods.

And there is a background that has been implemented

沖積地盤の軟弱層の粘性系及び砂質系又は互層地盤の場合で堆積層が厚く施工機械も大型が必要とされるが小規模の場合敷地面積も小さく搬入路も狭い場所で施工することは課題である又経済的でない、In the case of alluvial ground's soft layer and sandy system or alternate layer ground, the sedimentary layer is thick and the construction machinery is required to be large, but in the case of a small scale it is necessary to construct in a place where the site area is small and the carry-in route is narrow The problem is not economical

Means to solve the problem

課題を解決する手段として施工機械は小型化し、搬入物は短くし目的に応じられる施工可能な工法として考案した工法である、尚土質力学的には十分マッチした工法として考案した工法である、As a means to solve the problem, the construction machine is reduced in size, the load is shortened and the construction method devised as a construction method that can be applied according to the purpose, the construction method devised as a construction method well matched in terms of soil mechanics,

Embodiment of the Invention

実施に当たり土質調査を行い荷重条件に応じた設計をし圧縮、圧蜜沈下量を算出し、圧密、圧縮時間を算出し敷地面積に応じれる施工機械を選定し実施施工し圧縮、圧密沈下量を測定分析し、基礎梁工を構築し建造物を立ち上げる形態とするIn conducting the soil investigation, design according to the load conditions, calculating the compression and squeeze settlement amount, calculating the consolidation and compression time, selecting the construction machine according to the site area, and implementing the compression and consolidation settlement amount Measure and analyze, build foundation beam work and start building

負の摩擦力軽減及び地盤締固その他兼用鋼管基礎杭工法平面図Negative frictional force reduction and ground compaction and other combined steel pipe foundation pile method top view 負の摩擦力軽減及び地盤締固その他兼用鋼管基礎杭工法断面図Cross section of steel pipe foundation pile construction method for reducing negative frictional force and ground compaction 鋼管基礎杭詳細Steel pipe foundation pile details

１、鋼管基礎杭（長さ６ｍ〜１０ｍ、複数リブ付き、スリット付き、切込砂利、又は硅砂７荒目砂３混合フィルター材中詰）
２、鋼管基礎杭（４隅と中心部、強制排水可能設備付き鋼管）
３、強制排水揚水管挿入済み鋼管
４、水平ドレーン有孔管（塩ビ７５ｍｍ）
５、フィルター材（切込砂利、又は硅砂７荒目砂３混合材）
６、ケーシング付帯リブ
７、捨コンクリート
８、基礎梁
９、Ｕ字溝
１０、振動締固め有効径範囲
１１、基礎梁立ち上がり部
１２、スリット加工（幅２ｍｍ×長さ２０ｃｍ千鳥配置）1. Steel pipe foundation pile (length 6m ~ 10m, with multiple ribs, with slits, cutting gravel, or paddy sand 7 coarse sand 3 mixed filter material filling)
2. Steel pipe foundation pile (4 corners and center, steel pipe with equipment capable of forced drainage)
3. Steel pipe with forced drainage pump inserted 4. Horizontal drain perforated pipe (PVC 75mm)
5. Filter material (cutting gravel or dredged sand 7 coarse sand 3 mixed material)
6, Rib with casing 7, Discard concrete 8, Foundation beam 9, U-shaped groove 10, Vibration compaction effective diameter range 11, Foundation beam rising part 12, Slit processing (width 2mm x length 20cm staggered arrangement)

負の摩擦力軽減及び地盤締固その他兼用鋼管基礎杭工法平面図 Negative frictional force reduction and ground compaction and other combined steel pipe foundation pile method top view 負の摩擦力軽減及び地盤締固その他兼用鋼管基礎杭工法断面図 Cross section of steel pipe foundation pile construction method for reducing negative frictional force and ground compaction

Claims

The present invention was developed as a steel pipe pile that can be used for the following roles when building a detached house or a general structure on the ground where liquefaction phenomenon or consolidation subsidence occurs. Is a pile that can compact and improve the surrounding ground through the steel pipe pile when inserted into the steel pipe pile, and thirdly, the groundwater reduction method can be done through the steel pipe, and fourth, when an earthquake occurs after the steel pipe is placed, it occurs at the time of the earthquake A special steel pipe pile that can naturally drain excess pore water is claimed.

The steel pipe pile of the present invention has a steel pipe diameter in the range of 10 cm to 30 cm when used as a foundation of a general house or a small building, and the steel pipe diameter depends on the weight per unit of the house or the small building and the depth of the target ground. The steel pipe pile length is set to a fixed length of 6 m or 10 m, and a structure that can be inserted up to a predetermined depth by adopting a field welding joint method according to the depth of the target ground,

Steel pipe pile 6m or 10m long 20cm from the bottom and a structure with a plurality of 2m to 3m ribs attached to the top, and the rib width is up to 1/4 of the pipe diameter. A steel pipe pile having a structure in which slits are provided in a staggered arrangement of 20 cm in length and capable of forced drainage and natural drainage is claimed.

Planar layout of steel pipe piles as a foundation for ordinary houses or small buildings is to arrange steel pipe piles evenly within the target area, and the steel pipe piles at the four corners and the center of the building plane layout can be used for groundwater level lowering method. The other steel pipe piles are made of cut gravel or mixed material with a ratio of No. 2 dredged sand 7 coarse sand 3 so that excess pore water can be drained naturally during an earthquake, and the steel pipe piles at the four corners and the center are forced. Claims for steel pipe piles that can be used as economically safe piles that can be drained, promote compression and compaction using increased pressure and negative pressure due to water level drop, and eliminate negative frictional forces applied to piles in advance The range.