JP2844016B2 - Cast-in-place pile construction method - Google Patents
Cast-in-place pile construction methodInfo
- Publication number
- JP2844016B2 JP2844016B2 JP27054490A JP27054490A JP2844016B2 JP 2844016 B2 JP2844016 B2 JP 2844016B2 JP 27054490 A JP27054490 A JP 27054490A JP 27054490 A JP27054490 A JP 27054490A JP 2844016 B2 JP2844016 B2 JP 2844016B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- cast
- ground
- construction method
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Air Transport Of Granular Materials (AREA)
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は場所打ち杭構築工法に係わるものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cast-in-place pile construction method.
（従来の技術） 従来の場所打ち杭構築工法は、地盤中にケーシングを
打込み、ケーシング内の地盤を掘削し、掘削孔内に主筋
とフープ筋からなる鉄筋篭を挿入し、ケーシングを引抜
き、トレミー管を用いて掘削孔内にコンクリートを打設
する。(Prior art) The conventional cast-in-place pile construction method involves driving a casing into the ground, excavating the ground in the casing, inserting a reinforcing bar cage consisting of a main bar and a hoop bar into the drilling hole, pulling out the casing, Pour concrete into the borehole using pipes.
（発明が解決しようとする課題） しかしながら、地下流水が速い、または砂礫や転石が
多い地盤中に、従来の工法により場所打ち杭を構築する
場合（第６図）、 ＜イ＞流水により掘削孔壁が崩壊しやすい。(Problems to be solved by the invention) However, when a cast-in-place pile is to be constructed by a conventional method in the ground where groundwater is fast or where there is a lot of gravel and boulders (FIG. 6), The walls are easy to collapse.
＜ロ＞杭のコンクリートａ打設中、又は打設後のセメン
トペーストｂが流水によって洗い流され、従って、信頼
性の高い杭を構築することは困難である。<B> The cement paste b during or after placing the concrete a into the pile is washed away by flowing water, and therefore, it is difficult to construct a highly reliable pile.
＜ハ＞セメントペーストが拡散し地下水を汚染する惧れ
がある。<C> There is a risk that the cement paste will diffuse and contaminate the groundwater.
などの課題があった。There were issues such as.
（発明の目的） 本発明は前記従来技術の有する課題を解決するために
提案されたもので、地下流水が速い、また砂礫や転石が
多い地盤において、掘削孔壁が崩壊する惧れがなく、ま
た、杭コンクリートのセメントペーストが流逸すること
のない、構造上信頼の高い、高品質の場所打ち杭の建築
工法を提供する点にある。(Object of the Invention) The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and there is no fear that the excavation hole wall collapses in the ground where the groundwater is fast and there is a lot of gravel and boulders. Another object of the present invention is to provide a structurally reliable and high quality cast-in-place pile construction method in which the cement paste of pile concrete does not flow out.
（課題を解決するための手段） 前記目的を達成するため、本発明の場所打ち杭構築工
法は、地下流水のある、また砂礫や転石が多い地盤にお
いて、伸縮性及び止水性を有するシートからなる筒体
を、地下流水がある部分の杭の鉄筋篭に装着し、この鉄
筋篭を地盤中の掘削孔内に挿入した後、前記掘削孔内に
コンクリートを打設する構成である。(Means for Solving the Problems) In order to achieve the above-mentioned object, the cast-in-place pile construction method of the present invention comprises a sheet having elasticity and waterproofness in the ground with groundwater downstream, and in the ground with many gravel and rocks. The tubular body is mounted on a reinforced cage of a pile at a portion where groundwater flows, and the reinforced cage is inserted into a digging hole in the ground, and then concrete is poured into the digging hole.
（作用） 本発明によれば前記したように、伸縮性及び止水性を
有するシートからなる筒体を、地下流水がある部分の杭
の鉄筋篭に装着し、この鉄筋篭を地盤中の掘削孔内に挿
入して掘削孔内にコンクリートを打設し、場所打ち杭を
建築する。それにより、地下流水が速い、また砂礫や転
石が多い地盤中においても、 ＜イ＞杭のコンクリート打設に際し、止水機能を持つ筒
体が地下流水からコンクリートを保護するので、コンク
リート打設中、又は打設後のセメントペーストが流水に
より洗い流されることがなく、構造上信頼性の高い杭を
確実に構築することが可能となる。(Operation) According to the present invention, as described above, a tubular body made of a sheet having elasticity and waterproofness is mounted on a reinforcing bar of a pile in a portion where groundwater is present, and the reinforcing bar is excavated in the ground. And cast concrete into the borehole to construct a cast-in-place pile. As a result, even in the ground where the groundwater is fast, and where there is a lot of gravel and boulders, a concrete body with a waterproof function protects the concrete from the groundwater when the pile is poured. Or, the cement paste after casting is not washed away by running water, and it is possible to reliably construct a structurally reliable pile.
＜ロ＞杭のコンクリート打設に際し、伸縮機能を持つ筒
体は、礫や転石などの凹凸のある掘削孔面に密着するの
で掘削孔壁は崩壊することがなく、掘削孔面に対する杭
周面の摩擦が十分に確保できる。<B> When placing the concrete in the pile, the cylinder body with the expansion / contraction function adheres to the uneven surface of the excavation hole such as gravel or boulder, so the excavation hole wall does not collapse, and the pile peripheral surface with respect to the excavation hole surface Friction can be sufficiently secured.
（実施例） 以下、本発明を図示の実施例について説明する。(Examples) Hereinafter, the present invention will be described with reference to the illustrated examples.
＜イ＞場所打ち杭の構築工法（第１図、第２図） この構築工法を、地下流水のある、また砂礫や転石が
多い地盤に用いる。<B> Construction method of cast-in-place piles (Fig. 1 and Fig. 2) This construction method is used for ground with groundwater and a lot of gravel and boulders.
（１）地盤Ａ内に清水を用いたオールケーシング法によ
り杭体構成用の掘削孔Ｂを施工する。即ち、地盤Ａ中に
ケーシングを打込み、又は圧入しながら、ケーシング内
の土砂を掘削バケットにより掘削する。砂礫や転石が多
い地盤や、岩盤層に打込む場合、ケーシングにダイヤモ
ンドカッターを装着して掘削する。(1) A drilling hole B for constructing a pile body is constructed in the ground A by an all-casing method using fresh water. That is, while the casing is driven or pressed into the ground A, the earth and sand in the casing is excavated by the excavation bucket. When digging into the ground with many gravel or boulders, or into the bedrock layer, attach a diamond cutter to the casing and excavate.
（２）ケーシングの打込み及び掘削完了後、バキューム
ポンプを用いて、掘削孔Ｂ内に清水により清掃すると共
に孔底のスライムを除去する。(2) After the driving of the casing and the excavation are completed, the excavation hole B is cleaned with fresh water using a vacuum pump, and the slime at the bottom of the excavation hole is removed.
（３）杭の鉄筋篭８の地下流水がある部分に、シート13
からなる筒体７を装着する。(3) At the part of the reinforced cage 8 where there is groundwater downstream,
Is mounted.
（４）掘削孔Ｂ内に上記鉄筋篭８を挿入する。(4) Insert the reinforced cage 8 into the excavation hole B.
（５）掘削孔Ｂにトレミー管を挿入し、掘削孔Ｂの底部
よりコンクリート10を打設して行く。(5) Insert the tremy tube into the drilling hole B and place concrete 10 from the bottom of the drilling hole B.
＜ロ＞筒体７及び筒体７の装着方法（第１図〜第５図） 筒体７は、伸縮性と止水性を兼ね備えた合成繊維シー
ト又は合成ゴムシートなどの帯状シート13を、所定の直
径及び長さを有する筒形に形成したものである。<B> Cylindrical body 7 and method of mounting cylindrical body 7 (FIGS. 1 to 5) Cylindrical body 7 is provided with a belt-like sheet 13 such as a synthetic fiber sheet or a synthetic rubber sheet having both elasticity and waterproofness. It is formed in a cylindrical shape having a diameter and a length.
筒体７は、鉄筋篭８を設置する地盤Ａ中の部分、例え
ば中間層に地下流水があるとき、その流水の部位に係わ
る鉄筋篭８の周囲を包覆する。The cylindrical body 7 covers a portion in the ground A where the reinforcing bar cage 8 is installed, for example, when there is groundwater downstream in the intermediate layer, the periphery of the reinforcing bar cage 8 related to the flowing water portion.
筒体７の装着方法は、予め地上において、鉄筋篭８の
所要部分に前記帯状シート13を巻回し、同シート13同士
を固着14する。その場合、筒体７の周囲が、鉄筋篭８か
ら突設するスペーサー11の先端部に当接して、鉄筋篭８
の鉄筋と筒体７との間に、コンクリート10の被り代分の
間隔を保つように装着する。The mounting method of the tubular body 7 is to wind the belt-shaped sheet 13 around a required portion of the reinforcing bar cage 8 on the ground in advance and fix the sheets 13 to each other. In this case, the periphery of the cylindrical body 7 comes into contact with the distal end of the spacer 11 projecting from the reinforcing bar
Between the rebar and the cylindrical body 7 so as to keep an interval corresponding to the allowance of the concrete 10.
（発明の効果） 本発明の場所打ち杭構築工法は、以上説明したように
なるから次ぎのような効果を得ることができる。(Effects of the Invention) Since the cast-in-place pile construction method of the present invention is as described above, the following effects can be obtained.
伸縮性及び止水性を有するシートからなる筒体を、地
下流水がある部分の杭の鉄筋篭に装着し、この鉄筋篭を
掘削地盤中に挿入して掘削孔内にコンクリートを打設す
ることにより、 ＜イ＞杭のコンクリート打設に際し、止水機能を持つ筒
体が地下流水からコンクリートを保護するので、コンク
リート打設中、又は打設後のセメントペーストが流水に
より洗い流されることがなく、構造上信頼性の高い杭を
確実に構築することが可能となる。その結果、セメント
ペーストが拡散しないので、地下水は汚染される惧れが
ない。By attaching a tubular body made of a sheet having elasticity and water-blocking property to the reinforced cage of the pile where there is groundwater, inserting this reinforced cage into the excavated ground and placing concrete in the borehole <a> When pouring concrete into a pile, the water-stopping cylinder protects the concrete from groundwater, so that the cement paste during or after the concrete is poured is not washed away by running water. It is possible to reliably build a highly reliable pile. As a result, since the cement paste does not diffuse, the groundwater is not likely to be contaminated.
＜ロ＞杭のコンクリート打設に際し、伸縮機能を持つ筒
体は、礫や転石などの凹凸のある掘削孔面に密着するの
で掘削孔壁は崩壊することがなく、掘削孔面に対する杭
周面の摩擦が十分に確保できる。その結果、構造上、杭
の摩擦耐力が期待できる。<B> When placing the concrete in the pile, the cylinder body with the expansion / contraction function adheres to the uneven surface of the excavation hole such as gravel or boulder, so the excavation hole wall does not collapse, and the pile peripheral surface with respect to the excavation hole surface Friction can be sufficiently secured. As a result, due to the structure, the pile's frictional strength can be expected.
第１図 本発明に係わる場所打ち杭構築工法を説明する
杭の縦断面図 第２図 第１図の横断面図 第３図〜第５図 杭の鉄筋篭の中間に筒体を装着する工
程を示す説明図 第６図 従来工法による杭の実施状況を示す縦断面図 （符号） Ａ……地盤 Ｂ……掘削孔 ７……筒体 ８……鉄筋篭 10……コンクリート 13……帯状シート1 is a longitudinal sectional view of a pile for explaining a cast-in-place pile construction method according to the present invention. FIG. 2 is a transverse sectional view of FIG. 1. FIG. 3 to FIG. Fig. 6 Longitudinal sectional view showing the state of implementation of the pile by the conventional method (sign) A ... ground B ... excavation hole 7 ... cylindrical body 8 ... steel cage 10 ... concrete 13 ... strip-shaped sheet
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 5/34──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) E02D 5/34
Claims (1)
筒体を、地下流水がある部分の杭の鉄筋篭に装着し、 この鉄筋篭を地盤中の掘削孔内に挿入した後、前記掘削
孔内にコンクリートを打設することを特徴とする、 場所打ち杭構築工法。1. A tubular body made of a sheet having elasticity and waterproofness is attached to a reinforcing bar of a pile in a portion where groundwater is present, and after inserting the reinforcing bar into a drilling hole in the ground, the excavation is performed. Cast-in-place pile construction method characterized by placing concrete in the hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27054490A JP2844016B2 (en) | 1990-10-11 | 1990-10-11 | Cast-in-place pile construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27054490A JP2844016B2 (en) | 1990-10-11 | 1990-10-11 | Cast-in-place pile construction method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04149313A JPH04149313A (en) | 1992-05-22 |
| JP2844016B2 true JP2844016B2 (en) | 1999-01-06 |
Family
ID=17487671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27054490A Expired - Lifetime JP2844016B2 (en) | 1990-10-11 | 1990-10-11 | Cast-in-place pile construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2844016B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965398A (en) * | 2019-11-25 | 2020-04-07 | 中南大学 | Expansive soil foundation structure containing ballastless track roadbed and construction method |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0635326U (en) * | 1992-10-21 | 1994-05-10 | 基浩 東峰 | An outflow prevention device for ready-mixed concrete used for on-site pile driving |
| JP2765438B2 (en) * | 1993-06-25 | 1998-06-18 | 鹿島建設株式会社 | Sidewall protection method in borehole |
| DE69528377D1 (en) * | 1994-12-05 | 2002-10-31 | Shogen Okawa | Pile head treatment tool for a locally formed pile, and pile head treatment method |
| JP6539566B2 (en) * | 2015-10-29 | 2019-07-03 | 大亜ソイル株式会社 | Construction method of cast-in-place concrete pile |
| JP7195613B2 (en) * | 2019-09-10 | 2022-12-26 | 株式会社Ｅ・Ｃ・Ｓ | Insulation material used in cast-in-place pile construction method, core material provided with same, and construction method for cast-in-place pile |
| CN111924446A (en) * | 2020-07-27 | 2020-11-13 | 山东大学 | Segmented reinforcement cage transportation equipment and method |
-
1990
- 1990-10-11 JP JP27054490A patent/JP2844016B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110965398A (en) * | 2019-11-25 | 2020-04-07 | 中南大学 | Expansive soil foundation structure containing ballastless track roadbed and construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04149313A (en) | 1992-05-22 |
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