JPH0623448B2 - Rooting method - Google Patents
Rooting methodInfo
- Publication number
- JPH0623448B2 JPH0623448B2 JP62118531A JP11853187A JPH0623448B2 JP H0623448 B2 JPH0623448 B2 JP H0623448B2 JP 62118531 A JP62118531 A JP 62118531A JP 11853187 A JP11853187 A JP 11853187A JP H0623448 B2 JPH0623448 B2 JP H0623448B2
- Authority
- JP
- Japan
- Prior art keywords
- mortar
- pile
- cement
- sand
- strength
- 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
- 238000000034 method Methods 0.000 title claims description 8
- 239000004568 cement Substances 0.000 claims description 37
- 239000004570 mortar (masonry) Substances 0.000 claims description 34
- 239000008267 milk Substances 0.000 claims description 18
- 210000004080 milk Anatomy 0.000 claims description 18
- 235000013336 milk Nutrition 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000007596 consolidation process Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009435 building construction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は、コンクリート杭の根固め工法に関するもの
である。TECHNICAL FIELD The present invention relates to a method for consolidating concrete piles.
（従来の技術） 従来、杭を地中に埋設々置する場合に、杭の下端部と支
持地盤の結合を確保する為に杭穴底部に根固めを構成す
る工法が知られている。(Prior Art) Conventionally, there is known a construction method in which the bottom of a pile hole is consolidated in order to secure the connection between the lower end of the pile and the supporting ground when the pile is buried in the ground.
この工法では、杭穴の底部に、杭穴の径より大径の部分
（拡底部）を形成し、この部分にセメントミルクを注入
し又はコンクリートを打設し、杭の下端部と一体的に硬
化している（例えば特開昭６１−１０６２５号）。In this method, a part with a diameter larger than the diameter of the pile hole (bottom expanded part) is formed at the bottom of the pile hole, cement milk is poured into this part or concrete is placed, and it is integrated with the bottom end of the pile. It is cured (for example, JP-A-61-162525).
（発明が解決しようとする課題） 前記従来の根固め工法においては、杭と支持地盤の結合
をセメントミルクによって行った場合には、根固め部の
上部と下部における強度に差が生ずる問題があると共
に、孔内に注入する際、支持地盤の水によって希釈され
ることがあり、強度のバラツキを生ずると共に、全体的
な強度が小さくなる傾向があった。またコンクリートの
打設は、コンクリートポンプを必要とするのみならず、
水分の希釈による強度低下は免れなかった。(Problems to be Solved by the Invention) In the conventional root consolidation method, there is a problem that a difference in strength occurs between the upper portion and the lower portion of the root consolidation portion when the pile and the supporting ground are bonded by cement milk. At the same time, when injected into the holes, it may be diluted by the water of the supporting ground, resulting in variations in strength and a tendency for the overall strength to decrease. Also, placing concrete not only requires a concrete pump,
The strength was unavoidable due to the dilution of water.
又、杭に荷重が作用した場合、地盤と杭との中間にあっ
て両者を結合している根固め部が杭の中空部に貫入する
傾向があるので、これを防止するために杭の先端に閉鎖
鉄板をつけるなどの対策も必要であった。Also, when a load is applied to the pile, the root consolidation part that is located between the ground and the pile and connects the two tends to penetrate into the hollow part of the pile. It was necessary to take measures such as attaching a closed iron plate.
一方、一般にくいの支持層としては、砂・砂レキ層が圧
倒的に多く、ここにセメントミルク（根固め液）を注入
した際、その間隙からミルクが浸透して逸散する傾向が
あり、とくに砂レキ層では施工が不能となることも多か
った。On the other hand, as a generally difficult support layer, there are overwhelmingly many sand and sand layer, and when cement milk (root hardening liquid) is injected into this, the milk tends to permeate and escape from the gap, Especially in the sand gravel layer, construction was often impossible.
また、現場でモルタルを使用する場合には、外部から搬
入すると過剰供給となり膨大な無駄と手間が生じてい
た。また、現場でモルタルを調整する場合には、専用の
装置類を必要とし、大掛りとなり、コストアップを生じ
ていた。In addition, when mortar is used on site, if it is brought in from the outside, it will be over-supplied, resulting in enormous waste and effort. Further, when adjusting the mortar on site, a dedicated device is required, which is a large scale and causes an increase in cost.
（課題を解決する為の手段） そこでこの発明では、前記セメントミルクに代えてモル
タルを注入するようにし、強度や施工上の問題点を解決
したのである。(Means for Solving the Problem) Therefore, in the present invention, mortar is injected instead of the cement milk, and problems in strength and construction are solved.
即ちこの発明は、杭穴底部を根固め用の形状および大き
さに掘削した後、粘度を６０秒〜９０秒に調整し、かつ
細目の砂を用いて、砂・セメント比を１００〜１５０
（重量％）、水・セメント比を５３〜５８（重量％）、
流動化剤・セメント比を０．４〜０．７（重量％）とし
て調整したモルタルを前記杭穴底部にセメントミルクポ
ンプで注入して硬化させることを特徴とした根固め工法
である。That is, according to the present invention, after excavating the bottom of the pile hole into a shape and size for root consolidation, the viscosity is adjusted to 60 seconds to 90 seconds, and fine sand is used to adjust the sand / cement ratio to 100 to 150.
(Wt%), water-cement ratio of 53-58 (wt%),
This is a root-setting method characterized by injecting a mortar adjusted to have a fluidizing agent / cement ratio of 0.4 to 0.7 (% by weight) into the bottom of the pile hole with a cement milk pump to cure the mortar.
この場合、モルタルの粘度を６０秒未満とすると、懸濁
性が高くなって杭穴中の泥水とまざるので強度の低下が
生じて、施工上の信頼性がなくなり望ましくない。又、
粘土が９０秒を超えると、従来のセメントミルクポンプ
による圧送が不可能となり、注入設備を大幅に変更する
必要が生じ、かつ深い杭穴の場合の施工性が著しく悪く
なるおそれがあった。In this case, if the viscosity of the mortar is less than 60 seconds, the suspending property becomes high, and the mortar becomes muddy water in the pile holes, resulting in a decrease in strength and unreliability in construction, which is not desirable. or,
If the clay exceeds 90 seconds, the conventional cement milk pump cannot be pressure-fed, the injection equipment needs to be changed significantly, and the workability in the case of a deep pile hole may be significantly deteriorated.
杭の先端支持力Ｒａは Ｒａ＝１／３・α・・Ａｐ ［α：杭先端支持力係数、：杭先端Ｎ値、Ａｐ：杭閉
鎖断面積（m2）］で求められており、α＝２５（拡大根
固め場合）、＝６０として、６００φの杭では根固め
材の必要強度は１５０kg／cm2以上が必要とされ、通常
２００kg／cm2程度が得られるようにしている。The pile tip support force Ra is Ra = 1/3 · α ·· Ap [α: pile tip support force coefficient ,: pile tip N value, Ap: pile closed cross-sectional area (m 2 )], and α = 25 (in the case of expanded consolidation) and = 60, the required strength of the consolidation material is required to be 150 kg / cm 2 or more for a 600φ pile, and normally about 200 kg / cm 2 is obtained.
この発明では２５０〜３００kg／cm2を目標とし、かつ
粘度が６０秒〜９０秒のモルタルを調整するには、細目
の砂を用いて、砂・セメント比を１００〜１５０（重量
％）、水・セメント比を５３〜５８（重量％）、流動化
剤・セメント比を０．４〜０．７（重量％）として調整
することができる。In the present invention, in order to adjust the mortar with a target of 250 to 300 kg / cm 2 and a viscosity of 60 to 90 seconds, fine sand is used, the sand / cement ratio is 100 to 150 (wt%), water -The cement ratio can be adjusted to 53 to 58 (wt%) and the fluidizing agent-cement ratio to 0.4 to 0.7 (wt%).
前記粘度は、ファンネル粘度計により測定した。即ち定
量（例えば５００ｃｃ）の漏斗に入れた液体又は固体
が、全部落下する時間を測定し、その数値を該物品の粘
度としたものである。The viscosity was measured by a funnel viscometer. That is, the time taken for all the liquid or solid placed in a fixed amount (for example, 500 cc) of the funnel to fall was measured, and the value was taken as the viscosity of the article.
前記細目の砂とはＪＡＳＳ（Japanese Architectural S
tandard Specification、日本建築工事標準仕様書）５
と規定された砂を言い、粗粒率２．２（最大寸法１．２
mm）のものである。The fine sand is JASS (Japanese Architectural S
tandard Specification, Japanese Building Construction Standard Specification) 5
Sand with a coarse grain ratio of 2.2 (maximum size 1.2
mm).
（作用） この発明の根固め工法によれば、モルタルの粘度が６０
秒〜９０秒であるので、杭穴底部への注入をセメントミ
ルクポンプで行うことができるので容易となる。又、セ
メントミルクに比べてモルタルの比重が高いので、充填
効果も大きくすることができる。(Operation) According to the root-setting method of the present invention, the mortar has a viscosity of 60.
Since it is from 2 seconds to 90 seconds, the injection into the bottom of the pile hole can be performed by the cement milk pump, which is easy. Moreover, since the specific gravity of mortar is higher than that of cement milk, the filling effect can be increased.
又、比較的高粘度としてあるので、セメント粒子の分散
性が良くなり、硬化したモルタルの圧縮強度は、上部と
下部での強度差を少くし、しかも従来のセメントミルク
で得られた強度と同等乃至それ以上の値を得ることがで
きる。又、モルタルは懸濁性が小さいので、支持地盤の
水で希釈されることもなく硬化した場合の強度にバラツ
キがなく、安定した強度を得ることができる。更には砂
レキ層の支持地盤でもモルタルが砂レキの間隙を通して
逸散するおそれがないので、信頼性の高い施工ができ
る。Also, because of its relatively high viscosity, the dispersibility of cement particles is improved, and the compressive strength of hardened mortar has a small difference in strength between the upper and lower parts, and is equivalent to the strength obtained with conventional cement milk. Or more values can be obtained. Further, since the mortar has a small suspending property, the strength of the mortar when it is hardened without being diluted with water of the supporting ground does not vary, and stable strength can be obtained. Furthermore, since there is no possibility that the mortar will escape through the gaps of the sand gravel even on the support ground of the sand gravel layer, highly reliable construction can be performed.
尚、一般のモルタルは、特殊なコンクリートポンプによ
らなければ圧送できないので、信頼性の高い施工ができ
る。In addition, general mortar cannot be pumped unless a special concrete pump is used, so highly reliable construction is possible.
尚、一般のモルタルは、特殊なコンクリートポンプによ
らなければ圧送できないので、根固め工法においても、
膨大な設備を必要とし、著しいコストアップと施工の繁
雑さを招くが、この発明の方法では流動性を高くして、
セメントミルクポンプで問題なく注入できるようにした
ものである。In addition, since general mortar cannot be pumped unless it uses a special concrete pump,
A huge amount of equipment is required, which leads to a significant increase in cost and complexity of construction, but with the method of the present invention, the fluidity is increased,
It is a cement milk pump that can be injected without problems.
又、一般に使用されるモルタルはその調整に際し、混練
にはコンクリートミキサー又はモルタルミキサーを必要
とするので、設備が大型化するのであるが、この発明で
は流動性を高くして、セメントミルク用の設備が使用で
きる。Further, generally used mortar requires a concrete mixer or a mortar mixer for kneading when adjusting the mortar, so that the equipment becomes large in size, but in the present invention, the fluidity is increased and the equipment for cement milk is increased. Can be used.
尚、配合物に砂などの滑材が入る場合、その配合管理が
必要となるが、この点予め砂と水を所定の割合で調整し
ておき、これをセメントと混練するようにすることによ
り、現場における配合管理を容易にすることができる。In addition, when a lubricant such as sand enters the mixture, it is necessary to manage the mixture, but this point is to adjust the sand and water in a predetermined ratio in advance and knead it with cement. It is possible to easily manage the composition on site.
（実施例） 以下この発明の実施例について説明する。(Examples) Examples of the present invention will be described below.
はじめに、第１図に示したような杭穴１を掘削し、杭穴
１の底部に杭穴１の径より大きい径（１．５倍程度。尚
同一径でも良い）とした大径部２を所定深さ（例えば直
径の２倍程度）に形成した。First, a pile hole 1 as shown in FIG. 1 is excavated, and a large-diameter portion 2 having a diameter larger than the diameter of the pile hole 1 (about 1.5 times, the same diameter may be used) at the bottom of the pile hole 1 Was formed to a predetermined depth (for example, about twice the diameter).
次いで、第１表のような配合でモルタルを調整し、この
モルタルをセメントミルクポンプを使用して、前記大径
部２に注入する（第２図）。次に杭穴１内へ既製のコン
クリート杭３を下端を開放したまま沈設し、前記杭３の
下端をモルタル内へ挿入（モルタルの中間部まで）す
る。このようにして注入したモルタルが硬化すれば根固
め４を成形した基礎杭の設置工事が完了する。Next, a mortar is prepared with a composition as shown in Table 1, and this mortar is injected into the large diameter portion 2 using a cement milk pump (Fig. 2). Next, the ready-made concrete pile 3 is sunk into the pile hole 1 with the lower end open, and the lower end of the pile 3 is inserted into the mortar (up to the middle portion of the mortar). When the mortar injected in this way hardens, the installation work of the foundation pile with the root consolidation 4 formed is completed.
前記実施例においては、杭３の下端部がモルタル内のほ
ぼ中間まで挿入されたが、挿入深さは杭３の径の１．５
倍以上とし、杭穴１の底面に達する場合もある。In the above-mentioned embodiment, the lower end of the pile 3 was inserted almost to the middle of the mortar, but the insertion depth was 1.5 of the diameter of the pile 3.
It may be more than double and may reach the bottom of the pile hole 1.
砂：細目、表面乾燥状態 流動化剤：高性能減水剤（マイティー花王石鹸） 砂・セメント比c/s ＝ 100 （重量％） 水・セメント比w/c ＝55 （重量％） 流動化剤・セメント比M/c ＝ 0.5 （重量％） モルタルの注入はセメントミルクポンプで問題なく行な
えた。 Sand: Fine, surface dry state Fluidizer: High performance water reducing agent (Mighty Kao soap) Sand / cement ratio c / s = 100 (wt%) Water / cement ratio w / c = 55 (wt%) Fluidizer Cement ratio M / c = 0.5 (% by weight) Injection of mortar could be done without problems with a cement milk pump.
モルタルの調整に当り、砂・セメントc/s は１００（重
量％）未満では、モルタルとしての効果、即ちセメン
ト比の分散性の向上比重の増大強度の向上経済性
の向上が失われ、１５０（重量％）を超えると粘度が低
下してセメントミルクポンプによる圧送が困難であっ
た。When adjusting the mortar, if the sand / cement c / s is less than 100 (% by weight), the effect as a mortar, that is, the improvement of the dispersibility of the cement ratio, the increase of the specific gravity, the improvement of the strength, and the improvement of the economical efficiency are lost. If it exceeds 100% by weight, the viscosity is lowered and it is difficult to carry out pressure feeding by a cement milk pump.
一方・水・セメント比w/c は、圧縮強度との間に第４図
のような関係があり、目的とする圧縮強度（２５０〜３
００kg／cm2）が得られ、かつ上下での圧縮強度のバラ
ツキを小さくする為には５３〜５８重量％が適当と認め
られた。尚、第４図の強度は直径５０cm、高さ３０cmの
供試体を作成し、上部は高さ２００mmの部分の圧縮強
度、下部は１００mmの部分の圧縮強度として求めた。On the other hand, the water / cement ratio w / c has a relationship with the compressive strength as shown in Fig. 4, and the desired compressive strength (250-3
00 kg / cm 2 ) was obtained, and 53 to 58% by weight was considered to be appropriate in order to reduce the variation in compressive strength at the top and bottom. The strength shown in FIG. 4 was obtained by preparing a test piece having a diameter of 50 cm and a height of 30 cm, the upper part being the compressive strength of a portion having a height of 200 mm and the lower part being the compressive strength of a portion having a height of 100 mm.
又、流動化剤・セメント比M/c はモルタルの粘度との間
に第５図のような関係があり、添加量を多くすると滑材
分離が起り、添加量が少ないと粘度向上の効果が得られ
ないことから、M/c は０．４〜０．７（重量％）が適当
と考えられる。尚、図中セルフローは第一工業製薬社製
の流動化剤である。Also, the fluidizing agent / cement ratio M / c has a relationship with the viscosity of mortar as shown in Fig. 5. If the amount of addition is large, lubricant separation occurs, and if the amount of addition is small, the effect of improving viscosity is obtained. Since M / c cannot be obtained, 0.4 to 0.7 (% by weight) is considered to be appropriate. The cell flow in the figure is a fluidizing agent manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.
（発明の効果） 以上に説明したように、この発明によれば、前記構成で
粘度を６０秒〜９０秒に調整したモルタルを杭穴に注入
硬化させて根固めを形成するようにしたので、モルタル
の圧送にセメントミルクポンプを使用でき、従来と同一
の設備と作業で圧縮強度が高く、かつバラツキの少ない
根固めを確実に形成できる効果がある。従って、外部か
らモルタルを搬入する手間と無駄をなくし、現場のセメ
ントミルク用の装置を利用してモルタルを調整できる効
果がある。(Effects of the Invention) As described above, according to the present invention, since the mortar whose viscosity is adjusted to 60 seconds to 90 seconds in the above-described configuration is injected into the pile holes and cured to form the root consolidation, A cement milk pump can be used for pressure feeding of mortar, and with the same equipment and work as in the past, there is an effect that it is possible to reliably form a compaction with high compressive strength and less variation. Therefore, there is an effect that the trouble and waste of bringing in the mortar from the outside can be eliminated, and the mortar can be adjusted by using an on-site cement milk device.
第１図乃至第３図はこの発明の実施例における杭穴の断
面図、第４図は水・セメント比と圧縮強度の関係を示す
グラフ、第５図は流動化剤・セメント比と粘度の関係を
示すグラフである。 １……杭穴、２……大径部 ３……杭、４……根固め1 to 3 are cross-sectional views of pile holes in an embodiment of the present invention, FIG. 4 is a graph showing the relationship between water / cement ratio and compressive strength, and FIG. 5 is a fluidizer / cement ratio and viscosity. It is a graph which shows a relationship. 1 ... Pile hole, 2 ... Large diameter part 3 ... Pile, 4 ... Consolidation
Claims (1)
掘削した後、粘度を６０秒〜９０秒に調整し、かつ細目
の砂を用いて、砂・セメント比を１００〜１５０（重量
％）、水・セメント比を５３〜５８（重量％）、流動化
剤・セメント比を０．４〜０．７（重量％）として調整
したモルタルを前記杭穴底部にセメントミルクポンプで
注入して硬化させることを特徴とした根固め工法1. After excavating the bottom of a pile hole into a shape and size for root consolidation, the viscosity is adjusted to 60 to 90 seconds, and fine sand is used to adjust the sand / cement ratio to 100 to 150 ( Wt%), water / cement ratio of 53-58 (wt%), and fluidizing agent / cement ratio of 0.4-0.7 (wt%) adjusted mortar is injected into the bottom of the pile hole with a cement milk pump. Rooting method characterized by curing by hardening
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62118531A JPH0623448B2 (en) | 1987-03-16 | 1987-05-15 | Rooting method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6032487 | 1987-03-16 | ||
| JP62-60324 | 1987-03-16 | ||
| JP62118531A JPH0623448B2 (en) | 1987-03-16 | 1987-05-15 | Rooting method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPH011823A JPH011823A (en) | 1989-01-06 |
| JPS641823A JPS641823A (en) | 1989-01-06 |
| JPH0623448B2 true JPH0623448B2 (en) | 1994-03-30 |
Family
ID=26401396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62118531A Expired - Lifetime JPH0623448B2 (en) | 1987-03-16 | 1987-05-15 | Rooting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623448B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8816086U1 (en) * | 1988-12-24 | 1989-02-09 | Laboratorium Prof. Dr. Rudolf Berthold, 7547 Wildbad | Device for positioning a star wheel |
| JPH041319A (en) * | 1990-04-19 | 1992-01-06 | Mitani Sekisan Co Ltd | Foundation pile driving method in soft ground |
| JP6941553B2 (en) * | 2017-12-18 | 2021-09-29 | 株式会社竹中工務店 | Pile construction method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615118A (en) * | 1984-06-19 | 1986-01-10 | Hikari Giken Kogyo Kk | Formation work of over-all friction pile |
-
1987
- 1987-05-15 JP JP62118531A patent/JPH0623448B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS641823A (en) | 1989-01-06 |
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