JPS62197513A - Unsaturated vibrocompactor for sandy ground - Google Patents
Unsaturated vibrocompactor for sandy groundInfo
- Publication number
- JPS62197513A JPS62197513A JP3810486A JP3810486A JPS62197513A JP S62197513 A JPS62197513 A JP S62197513A JP 3810486 A JP3810486 A JP 3810486A JP 3810486 A JP3810486 A JP 3810486A JP S62197513 A JPS62197513 A JP S62197513A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- unsaturated
- sandy ground
- vacuum pipe
- vibration compaction
- 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.)
- Granted
Links
- 238000005056 compaction Methods 0.000 claims description 20
- 239000004576 sand Substances 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 239000003673 groundwater Substances 0.000 description 12
- 238000010276 construction Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000972773 Aulopiformes Species 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000019515 salmon Nutrition 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的Ｉ
ＩＥＩαに１す」
本発明は、地下水位の比較的高い砂質地盤を不飽和な状
態で締固めする装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Objectives of the Invention I and IEIα] The present invention relates to an apparatus for compacting sandy ground with a relatively high groundwater level in an unsaturated state.
Ａ乳へ皮（
従来、この種の砂質地盤の締固め装置としては、砕石杭
や砂杭を形成させていくコンパクシタンパイル工法に使
用する中空管や、本締めと振動とによって砂の密度を大
にするバイブロ７０ツトを主とするらのがあった。A milk heel (Conventionally, this type of compaction equipment for sandy ground uses hollow pipes used in the compaction pile construction method to form crushed stone piles and sand piles, and compaction equipment for sandy soil by final tightening and vibration. There was one that mainly contained 70 vibro to increase density.
これらの装置はいずれも、砂質地盤の地下水位等は考慮
しておらず、特にバイブロ７０ツトは水を注入して、単
に砂の相対密度のみ増加させようとするものである。None of these devices takes into account the underground water level of sandy ground, and the Vibro 70 in particular attempts to simply increase the relative density of sand by injecting water.
明が １ しようとする α
しかしながら、近年になって砂質地盤の液状化現象のメ
カニズムが解明されるに至って、液状化に抵抗するもの
は、単純に砂の相対密度と相関関係があるのではなくて
、砂質地盤の締固め方法や地下水位等の条件に影響を受
けることが解って釆で、上記従来装置では、地下水位が
高くて比較的緩い沖積砂質地盤や埋立砂地盤の液状化抵
抗を増加せしめることができず、特に、シルト含有分の
多い砂質系地盤では締固めが十分でない等の問題点があ
った。However, in recent years, the mechanism of liquefaction in sandy ground has been elucidated, and it has become clear that resistance to liquefaction may simply be correlated with the relative density of sand. However, it is known that it is affected by conditions such as the compaction method of the sandy ground and the groundwater level. However, there were problems such as insufficient compaction, especially in sandy ground with a high silt content.
本発明は、上記従来の問題点を解決するためになされた
もので、その目的とするところは、地下水位が比較的高
くて緩い沖積砂質地盤や埋立砂質地盤の液状化抵抗を効
果的に向上することができる砂質地盤の不飽和振動締固
め装置を提供することにある。The present invention was made to solve the above conventional problems, and its purpose is to effectively reduce liquefaction resistance in alluvial sandy ground and reclaimed sandy ground where the groundwater level is relatively high and loose. The object of the present invention is to provide an unsaturated vibration compaction device for sandy ground that can improve the compaction of sandy ground.
［発明の構成１
点を するための
本発明の砂質地盤の不飽和振動締固め装置は、起振装置
を備えたケーシングと、該ケーシングに取り付けられた
バキュームパイプからＭ！を成されていることを特徴と
するものである。[Constitution of the Invention 1 Point] The unsaturated vibration compaction device for sandy ground of the present invention has a casing equipped with a vibrating device, and a vacuum pipe attached to the casing. It is characterized by the following.
Ｋ１鮭
以下、本発明の一実施例について図面を参照しながら説
明する。K1 Salmon An embodiment of the present invention will be described below with reference to the drawings.
第１図および第２図において、１はそのケーシングであ
り、その下部は膨径状の振動部２どなっている。該振動
ｅ２の内部には破線で示すように、起振装置３が収＃さ
れている。該起振装置！！３は上記振動部２に横（水平
）方向の振動を与えるようになっている。In FIG. 1 and FIG. 2, 1 is the casing, and the lower part thereof is a vibrating section 2 having an expanded diameter. A vibration excitation device 3 is housed inside the vibration e2, as shown by a broken line. The vibration device! ! 3 is adapted to apply vibration to the vibrating section 2 in the lateral (horizontal) direction.
！Ａｔこ、ケーシング１の上端部にも起振装置４が設置
されていて上記振動部２に縦（上下）方向の振動を与え
るようになっている。! At this point, a vibration excitation device 4 is also installed at the upper end of the casing 1 so as to apply vibration to the vibrating section 2 in the vertical (vertical) direction.
第２図からも明らかなように、上記ケーシング１の両側
面にはバキュームパイプ５が複数本（本実施例では３本
）ずつ付設されている。それぞれの而の各バキュームパ
イプ５は、それぞれ下端吸込口５ｎの位置が、例元ば１
．５槍ずつずらせて配置されており、各高さ位置の地下
水を排水し得るようになっている。各バキュームパイプ
５の上端部はバキュームポンプ６に接続されている。As is clear from FIG. 2, a plurality of vacuum pipes 5 (three in this embodiment) are attached to both sides of the casing 1. For each of the vacuum pipes 5, the position of the lower end suction port 5n is, for example, 1.
．． Five spears are arranged in a staggered manner, allowing groundwater to be drained from each height. The upper end of each vacuum pipe 5 is connected to a vacuum pump 6.
尚、上記バキュームパイプ５は上記ケーシング１内に納
めるようにしてもよい。この場合には、ケーシング１に
多数の穴をあけて、地下水が流入できるようにしておく
。Incidentally, the vacuum pipe 5 may be housed within the casing 1. In this case, a large number of holes are made in the casing 1 to allow groundwater to flow in.
次に、上記実施例装置による不飽和振動締固め工法につ
いて説明する。Next, an unsaturated vibration compaction method using the apparatus of the above embodiment will be explained.
先ず、第３Ａ図に示すように、地下水面ＷＬが比較的高
い砂質地盤Ｓを改良する場合に、第３Ｂ図に示すように
ケーシング１を吊下げた状態でクレーン７を所定位置に
移動させ、ケーシング１の振動部２を水平および上下に
振動させながら地盤Ｓ中に貫入せしめる。First, as shown in Fig. 3A, when improving the sandy ground S where the groundwater level WL is relatively high, the crane 7 is moved to a predetermined position with the casing 1 suspended as shown in Fig. 3B. , the vibrating part 2 of the casing 1 is made to penetrate into the ground S while vibrating horizontally and vertically.
ケーシング１の下端部が所定ｍさに達したら、バキュー
ムポンプ６を作動させて、ｔｐＪｓＣ図に示すように、
バキュームパイプ５により地下水を吸引排水する。When the lower end of the casing 1 reaches a predetermined length, the vacuum pump 6 is activated, and as shown in the tpJsC diagram,
The vacuum pipe 5 sucks and drains groundwater.
地下水を排水してケーシング１の周辺地盤が不飽和状態
になったら、第３Ｄ図に示すようにブルドーザ−８等に
より砕石Ｇあるいは砂を投入しながら、ケーシング１を
振動させながら引上げ、第３Ｅ図に示すように締固めを
完了する。尚、地下水面ＷＬは最終的に復帰する。When the ground around the casing 1 becomes unsaturated by draining the groundwater, the casing 1 is pulled up while being vibrated while injecting crushed stone G or sand with a bulldozer 8, etc., as shown in Fig. 3D. Complete compaction as shown. Note that the groundwater table WL will eventually return to normal.
第４図は別の実施例装置を示すものであって、矩形断面
を有する筒状のケーシング９の下方先端部に開閉蓋９ａ
を取り付け、該ケーシング９が地盤Ｓの所定深さに達し
たら、該開閉蓋９ａをＩｊｌｌいて、該中空ケーシング
９内を通じて投下した砕石Ｇ等を下端開口部から放出す
ると共に、ケーシング９を振動させながら引き抜く、
また、本実施例では、ケーシング９の両側面に１本ずつ
のバキュームパイプ１０が付設されていて、その吸引口
１０ａの高さ位置を任意に変更し得るようになっている
。吸引口１０ａの位Ｍ変更方法としては、バキュームパ
イプ１０を上下にスライドさせたり、或いはバキューム
パイプ１０の下方部に複数の穴（図示せず）をあけてお
いて、選択的に開閉せしめるようにしてもよい。尚、上
記ケーシング９の断面形状は矩形に限らず、円形、多角
形等いずれでもよい。FIG. 4 shows another embodiment of the device, in which an opening/closing lid 9a is provided at the lower end of a cylindrical casing 9 having a rectangular cross section.
is installed, and when the casing 9 reaches a predetermined depth in the ground S, the opening/closing lid 9a is opened to release crushed stones G etc. dropped through the hollow casing 9 from the lower end opening, and the casing 9 is vibrated. while pulling it out,
Further, in this embodiment, one vacuum pipe 10 is attached to each side of the casing 9, and the height position of the suction port 10a can be changed arbitrarily. To change the position M of the suction port 10a, slide the vacuum pipe 10 up and down, or make a plurality of holes (not shown) in the lower part of the vacuum pipe 10 and open and close it selectively. It's okay. Note that the cross-sectional shape of the casing 9 is not limited to a rectangle, but may be circular, polygonal, or the like.
以上のように、本発明のケーシング１，９は、非円形断
面に形成してもよく、砕石Ｇ等の投下はケーシング１，
９の外部からでも内部からでもよい。さらに、バキュー
ムパイプは１本でも複数本でもよく、地下水の吸引位置
が変えられるものであれば、いずれの構造のものでもよ
い。また、バキュームパイプ５．１０はケーシング１，
９の内部または外部、或いは内部と外部の両方に配置し
てもよい。As described above, the casings 1 and 9 of the present invention may be formed to have a non-circular cross section, and the crushed stones G etc. are dropped into the casings 1 and 9.
It may be from outside or inside 9. Furthermore, the vacuum pipe may be one or more, and may have any structure as long as the suction position of groundwater can be changed. Also, the vacuum pipe 5.10 is connected to the casing 1,
It may be placed inside or outside of 9, or both inside and outside.
■発明の効果］
本発明装置は、地盤を不飽和状態で振動して締固めるた
め、地下水位が高くて比較的緩い沖積砂質地盤や埋立砂
地盤の液状化抵抗を増加せしめることができる。特に、
シルト貿等の紹粒粘土分の水中浮遊がないので、シルト
含有分の多い砂質系地盤でも締固め効果が優れている。[Effects of the Invention] Since the device of the present invention vibrates and compacts the ground in an unsaturated state, it can increase the liquefaction resistance of alluvial sandy ground and reclaimed sandy ground, which have a high groundwater level and are relatively loose. especially,
Since there is no suspension of granular clay such as silt in the water, the compaction effect is excellent even on sandy ground with a high silt content.
第１図は本発明装置の一実施例の側面図、第２図は第１
図の底面図、第３Ａ図〜ｆｉ３Ｅ図は本発明装置による
施工を順次説明する施工状態図、第４図は別の実施例を
示す斜視図である。
１・・・ケーシング、２・・・振動部、３，４・・・起
振装置、５・・・バキュームパイプ、５ａ・・・下端吸
込口、６・・・バキュームポンプ、７・・・クレーン、
８・・・ブルドーザ−１９・・・ケーシング、 ９ａ・
・・開閉蓋、１０・・・ケーシング、１０ａ・・・吸込
口、Ｇ・・・砕石、Ｓ・・・砂質地盤、ＧＬ・・・地表
面、ＷＬ・・・地下水面。FIG. 1 is a side view of one embodiment of the device of the present invention, and FIG.
The bottom view and FIGS. 3A to 3E are construction state diagrams sequentially illustrating construction by the apparatus of the present invention, and FIG. 4 is a perspective view showing another embodiment. DESCRIPTION OF SYMBOLS 1... Casing, 2... Vibrating part, 3, 4... Oscillating device, 5... Vacuum pipe, 5a... Lower end suction port, 6... Vacuum pump, 7... Crane ,
8...Bulldozer-19...Casing, 9a.
...opening/closing lid, 10...casing, 10a...suction port, G...crushed stone, S...sandy ground, GL...ground surface, WL...ground water table.
Claims (9)
取り付けられたバキュームパイプから構成されているこ
とを特徴とする砂質地盤の不飽和振動締固め装置。(1) An unsaturated vibration compaction device for sandy ground, characterized by comprising a casing equipped with a vibrating device and a vacuum pipe attached to the casing.
振動を与えるようにしたことを特徴とする前記特許請求
の範囲第１項に記載の砂質地盤の不飽和振動締固め装置
。(2) The unsaturated vibration compaction device for sandy ground according to claim 1, characterized in that the vibrating device applies lateral vibration to the lower part of the casing.
ことを特徴とする前記特許請求の範囲第１項または第２
項のいずれかに記載の砂質地盤の不飽和振動締固め装置
。(3) Claim 1 or 2, characterized in that the lower part of the casing is formed in an expanded diameter shape.
An unsaturated vibration compaction device for sandy ground according to any one of paragraphs.
や砂等を投入し得るようにしたことを特徴とする前記特
許請求の範囲第１項ないし第３項のいずれかに記載の砂
質地盤の飽和振動締固め装置。(4) The sand quality according to any one of claims 1 to 3, wherein the casing is formed in a hollow shape so that crushed stone, sand, etc. can be charged therein. Ground saturation vibration compaction equipment.
り付けられていることを特徴とする前記特許請求の範囲
第１項ないし第４項のいずれかに記載の砂質地盤の不飽
和振動締固め装置。(5) The unsaturated vibration compaction device for sandy ground according to any one of claims 1 to 4, wherein the vacuum pipe is attached to the outer surface of the casing.
付けられていることを特徴とする前記特許請求の範囲第
１項ないし第４項のいずれかに記載の砂質地盤の不飽和
振動締固め装置。(6) The apparatus for unsaturated vibration compaction of sandy ground according to any one of claims 1 to 4, wherein the vacuum pipe is installed inside a casing.
ュームパイプの下端部の吸引口の高さ位置を変えたこと
ことを特徴とする前記特許請求の範囲第１項ないし第６
項のいずれかに記載の砂質地盤の不飽和振動締固め装置
。(7) A plurality of the vacuum pipes are arranged, and the height position of the suction port at the lower end of each vacuum pipe is changed.
An unsaturated vibration compaction device for sandy ground according to any one of paragraphs.
端部の吸引口の高さを変更し得るようにしたことを特徴
とする前記特許請求の範囲第１項ないし第６項のいずれ
かに記載の砂質地盤の不飽和振動締固め装置。(8) Any one of claims 1 to 6, characterized in that the vacuum pipe is configured to slide up and down to change the height of the suction port at its lower end. An unsaturated vibration compaction device for sandy ground as described in .
択的に開閉せしめるようにしたことを特徴とする前記特
許請求の範囲第１項ないし第６項のいずれかに記載の砂
質地盤の不飽和振動締固め装置。(9) The vacuum pipe is provided with a plurality of suction ports so as to be selectively opened and closed. Saturation vibration compaction equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61038104A JPH0639773B2 (en) | 1986-02-22 | 1986-02-22 | Unsaturated vibration compactor for sandy ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61038104A JPH0639773B2 (en) | 1986-02-22 | 1986-02-22 | Unsaturated vibration compactor for sandy ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62197513A true JPS62197513A (en) | 1987-09-01 |
| JPH0639773B2 JPH0639773B2 (en) | 1994-05-25 |
Family
ID=12516163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61038104A Expired - Fee Related JPH0639773B2 (en) | 1986-02-22 | 1986-02-22 | Unsaturated vibration compactor for sandy ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0639773B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01141829U (en) * | 1988-03-17 | 1989-09-28 | ||
| JPH03137314A (en) * | 1989-10-20 | 1991-06-11 | Shimizu Corp | Preventing work method for liquidification of sandy ground |
| JP4685296B2 (en) * | 2001-09-25 | 2011-05-18 | 関谷 雪雄 | The tip of the box used for the drain construction method |
| JP2015055101A (en) * | 2013-09-12 | 2015-03-23 | 五洋建設株式会社 | Mechanical agitation type vacuum compaction method and agitation device for mechanical agitation type vacuum compaction method |
| JP2015055100A (en) * | 2013-09-12 | 2015-03-23 | 五洋建設株式会社 | Mechanical agitation type vacuum compaction method and agitation device for mechanical agitation type vacuum compaction method |
| JP2015209710A (en) * | 2014-04-28 | 2015-11-24 | 五洋建設株式会社 | Compaction method for saturated ground |
| JP2019157382A (en) * | 2018-03-08 | 2019-09-19 | 大成建設株式会社 | Ground improvement method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5387509A (en) * | 1977-01-11 | 1978-08-02 | Minoru Kuroda | Method of compacting weak ground |
| JPS6073912A (en) * | 1983-09-30 | 1985-04-26 | Fudo Constr Co Ltd | Dehydration type rod compaction method |
-
1986
- 1986-02-22 JP JP61038104A patent/JPH0639773B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5387509A (en) * | 1977-01-11 | 1978-08-02 | Minoru Kuroda | Method of compacting weak ground |
| JPS6073912A (en) * | 1983-09-30 | 1985-04-26 | Fudo Constr Co Ltd | Dehydration type rod compaction method |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01141829U (en) * | 1988-03-17 | 1989-09-28 | ||
| JPH03137314A (en) * | 1989-10-20 | 1991-06-11 | Shimizu Corp | Preventing work method for liquidification of sandy ground |
| JP4685296B2 (en) * | 2001-09-25 | 2011-05-18 | 関谷 雪雄 | The tip of the box used for the drain construction method |
| JP2015055101A (en) * | 2013-09-12 | 2015-03-23 | 五洋建設株式会社 | Mechanical agitation type vacuum compaction method and agitation device for mechanical agitation type vacuum compaction method |
| JP2015055100A (en) * | 2013-09-12 | 2015-03-23 | 五洋建設株式会社 | Mechanical agitation type vacuum compaction method and agitation device for mechanical agitation type vacuum compaction method |
| JP2015209710A (en) * | 2014-04-28 | 2015-11-24 | 五洋建設株式会社 | Compaction method for saturated ground |
| JP2019157382A (en) * | 2018-03-08 | 2019-09-19 | 大成建設株式会社 | Ground improvement method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0639773B2 (en) | 1994-05-25 |
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