JPS58101922A - Control or air pressure in hollow pipe for sand pile construction - Google Patents
Control or air pressure in hollow pipe for sand pile constructionInfo
- Publication number
- JPS58101922A JPS58101922A JP20107081A JP20107081A JPS58101922A JP S58101922 A JPS58101922 A JP S58101922A JP 20107081 A JP20107081 A JP 20107081A JP 20107081 A JP20107081 A JP 20107081A JP S58101922 A JPS58101922 A JP S58101922A
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- pressure
- air
- sand
- hollow pipe
- 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
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
- E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【発明の詳細な説明】
従来から、軟弱地盤に砂杭造成を行なう際に、中空管内
に圧縮空気を供給すると、管内砂の砂抜けが良くなるこ
とは、経験的に仰られていたが、この場合の空気圧の制
御は、専らオペレーターの経験上の勘に頼るものであっ
たため、オペレーターの能力に左右されることになり、
必然的に砂抜は量のばらつ１！が多かった。[Detailed Description of the Invention] Conventionally, it has been said from experience that when constructing sand piles on soft ground, supplying compressed air into hollow pipes improves the removal of sand inside the pipes. In this case, air pressure control relied solely on the operator's experience and intuition, and was therefore dependent on the operator's ability.
Inevitably, the amount of sand removed will vary! There were many.
本発明は、前記問題点の克服を意図したものであって、
その特徴とするところは、砂杭造成用中空管内に圧縮空
気を供給して管内の砂倉軟弱地盤中に排出させる工程に
おいて、中空管内の空気圧が中空管下端における土圧に
相当する下限設定圧力とこれより若干大きい上限設定圧
力の間におさまるように、給・排気操作を自動制御する
点にある。The present invention is intended to overcome the above problems, and includes:
The feature is that in the process of supplying compressed air into the hollow pipe for sand pile construction and discharging it into the soft ground of the sand bank inside the pipe, the air pressure inside the hollow pipe is set at a lower limit that corresponds to the earth pressure at the lower end of the hollow pipe. The point is that the supply and exhaust operations are automatically controlled so that the pressure falls between the upper limit set pressure and the slightly larger upper limit set pressure.
以下、図面に基いて本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail based on the drawings.
第１図に本発明を実施して砂杭を造成する装置の１例が
示されて−るが、図中、１は中空管、２は砂投入ホッパ
ー、３は買Ｊ、機、４は空気弁、５は給気管、６は排気
管、７は排気弁、８は圧力センサー、９は切換弁、１０
はレシーバ−タンク、１１は深度計、１２は砂面計、１
３は計器（制御盤）、１４は記録器、１５は外管、１６
は砂排出兼締固め部材、１７は強制上下動機構（例えば
油圧シリンダー）である。Fig. 1 shows an example of a device for constructing sand piles according to the present invention. is an air valve, 5 is an air supply pipe, 6 is an exhaust pipe, 7 is an exhaust valve, 8 is a pressure sensor, 9 is a switching valve, 10
is the receiver tank, 11 is the depth gauge, 12 is the sand level gauge, 1
3 is an instrument (control panel), 14 is a recorder, 15 is an outer tube, 16
17 is a sand discharge and compaction member, and 17 is a forced vertical movement mechanism (for example, a hydraulic cylinder).
第２図は、第１図の装置を用いて軟弱地盤中に砂杭を造
成する一施工例における中空管１の下漏の軌跡でおり、
この軌跡は深度計１１より得られる。Figure 2 shows the locus of leakage of the hollow pipe 1 in one construction example in which sand piles are constructed in soft ground using the equipment shown in Figure 1.
This trajectory is obtained from the depth meter 11.
第２図において、ａ−＋ｂは貰人中、ｂ−＋ｃは中空管
１を引抜きつつ砂杭造成中、ｃ−＋ｄは中空管１の引抜
きを中止して砂補給中、ｄ→ｅはｂ−＋ｃと同じ、であ
り、以後、砂補給と砂杭造成を繰返して、ｂ点より地表
まで延びる砂杭を形成するのであるが、この施工例にお
いて本発明の空気圧制御が行なわれるのは、主として中
空管１の引抜き工程（ｂ−＋ｃ、ｄ→ｅ、・・・・・・
）である。In Fig. 2, a-+b is receiving, b-+c is building a sand pile while pulling out the hollow tube 1, c-+d is replenishing sand after stopping pulling out the hollow tube 1, and d→e is the same as b-+c, and after that, sand replenishment and sand pile construction are repeated to form a sand pile extending from point b to the ground surface, but in this construction example, the pneumatic pressure control of the present invention is performed. is mainly the drawing process of the hollow tube 1 (b-+c, d→e,...
).
中空ｆｌの各引抜き工程（砂の排出工程）において、管
内空気圧を管下端の土圧に相当する下限設定圧力とこれ
より若干大きな上限設定圧力の間におさまるように自動
制御するのであるが、これら設定圧力は第３図、第４図
において線分Ａ、Ａ’（但し、ｂ−＋０間のもの）で示
されている。In each drawing process (sand discharge process) of the hollow fl, the air pressure inside the pipe is automatically controlled to be between the lower limit setting pressure corresponding to the earth pressure at the lower end of the pipe and the upper limit setting pressure slightly larger than this. The set pressure is shown by line segments A and A' (between b-+0) in FIGS. 3 and 4.
一般に、深度２の土圧σｒは
σ２＝１２＋β
ここで、γ：地盤土壌の単位体積重量
β：受働土圧を考えるときは２ｃ
（Ｃ：地盤強度）
静止土圧を考えるときはＯ
で表されるから、ｂ−＋０間でγが変化しないものとし
、かつ、静止土圧を考えるとすれば。In general, the earth pressure σr at depth 2 is expressed as σ2=12+β where γ: unit volume weight of ground soil β: 2c when considering passive earth pressure (C: ground strength) O when considering static earth pressure Therefore, if we assume that γ does not change between b-+0 and consider static earth pressure.
線分Ａは ｕａ＝１２ 線分Ａ′は ｕａ＝γｚ＋Δｕａ ただし、ｚ＝ｚｂ−２゜ で示される。Line segment A is ua=12 Line segment A' is ua=γz+Δua However, z=zb−2゜ It is indicated by.
次に、ｌ） −＋ （４間の管内空気圧制御を第１図、
第４図で具体的に説明する。Next, the air pressure control in the pipe between l) −+ (4 is shown in Fig. 1,
This will be explained in detail with reference to FIG.
給気■：
中空管１の引抜きに先立って、信号により、排気弁７が
閉じられるとともに、切換弁９が作動して、レシーバ−
タンク１０からの圧縮空気が給気管５を経て中空管１内
に送られる。管内の上昇する空気圧は圧力センサー８に
より刻々検知これて、計器１３に入力される。Air supply ■: Prior to drawing out the hollow pipe 1, the exhaust valve 7 is closed by a signal, and the switching valve 9 is activated to open the receiver.
Compressed air from the tank 10 is sent into the hollow tube 1 via the air supply pipe 5. The rising air pressure inside the pipe is detected moment by moment by the pressure sensor 8 and inputted to the meter 13.
深度計１１から管下端深度が計器１３中に信号により入
力されているから、そのｌ！！！度（Ｚｂ ）における
線分Ａ′の圧力筒で給気が続けられる。Since the depth at the lower end of the tube is inputted as a signal from the depth gauge 11 into the gauge 13, that l! ! ! Air supply continues in the pressure cylinder of line segment A' at degree (Zb).
給伽排気の中止（２）：
管内空気圧ｕａが線分Ａ′の圧力付近に達したとき、計
器１３から信号が与えられ、切換弁９が作動して圧縮空
気の供給が停止する。Canceling air supply and exhaust (2): When the pipe air pressure ua reaches around the pressure of line segment A', a signal is given from the meter 13, the switching valve 9 is operated, and the supply of compressed air is stopped.
中空管１の引抜きが開始され、中空管１の引抜きに伴い
、砂が排出されるから、管内空気圧ｕａは下がっていく
。その圧力は圧力センサー８により刻々検知され、計器
１３に入力これる。The drawing of the hollow tube 1 is started, and as the hollow tube 1 is drawn out, the sand is discharged, so that the air pressure ua in the tube decreases. The pressure is detected every moment by the pressure sensor 8 and inputted to the meter 13.
ｌ
−万、深度計、ＶＣより刻々変化する管下端深度が検出
され、計器１３に入力されているから、線分Ａの圧力に
なるまで給気は行なわれない。Since the constantly changing depth of the lower end of the pipe is detected by the depth gauge and VC and inputted to the meter 13, air supply is not performed until the pressure of line segment A is reached.
給気■：
計器１３からの信号で切換弁９が作動し、圧縮空気が給
気管５より管内に送られる（給気■と同じ）。Air supply ■: The switching valve 9 is activated by a signal from the meter 13, and compressed air is sent into the pipe from the air supply pipe 5 (same as air supply ■).
給・排気の中止■、給気■は（２）、■と同じである。Suspension of supply/exhaust ■ and air supply ■ are the same as (2) and ■.
排気■：
給気ψ）によりＡ′の圧力を越えてしまった場合であり
、切換弁９が閉じられ、排気弁７が開いて、管内空気が
排気管６を経て管外へ排出される。Exhaust ■: This is a case where the pressure of A' is exceeded by the supply air ψ), the switching valve 9 is closed, the exhaust valve 7 is opened, and the air inside the pipe is discharged to the outside of the pipe via the exhaust pipe 6.
給・排気の中止■：
管内空気圧ｕａがＡ′の圧力以下となったとき、排気弁
７が閉じられ、そのま１の状聾’ｋｕａがＡの圧力にな
るまで保つ。Suspension of supply/exhaust ■: When the air pressure ua in the tube becomes less than the pressure A', the exhaust valve 7 is closed and the condition is maintained until the pressure A'kua reaches the pressure A'.
給気■、給・排気の中止■は■、（２）と同じである。Air supply ■ and stopping supply/exhaust ■ are the same as ■ and (2).
排気■：
２ 深度計１．１により中空管１０１回の引抜き長り
が検知されると、引抜きを停止し、同時に排気弁７が開
かれて管内空気が管外へ排出される。Exhaust ■: 2 When the depth gauge 1.1 detects the length of the hollow tube 101 times, the extraction is stopped, and at the same time the exhaust valve 7 is opened to discharge the air inside the tube to the outside of the tube.
なお、Ｌが検知された時点が給気中の場合には、切換弁
９の作動により給気が中止されるとともに、排気弁７が
開いて排気がなされる。 一本発明によれば、
前述のように管内空気圧を制御するので、中空管１の引
抜きに伴い適正な砂排出がなされ、仮にオペレーターが
経験の少ない渚であって同等不都合は生じない。Note that if the air is being supplied at the time when L is detected, the switching valve 9 is operated to stop the air supply, and the exhaust valve 7 is opened to exhaust the air. According to one invention,
Since the air pressure inside the tube is controlled as described above, sand is properly discharged when the hollow tube 1 is pulled out, and even if the operator is Nagisa with little experience, the same inconvenience will not occur.
以上、第１図の装置における砂排出兼締固め部材１６ｔ
−作動させないで、外管１５の径と同径の砂を排出させ
る場合について述べたが、砂排出兼締固め部材１６を作
動させて、外管１５の径より大きい径の締固め砂杭を造
成する場合において、第３頁の土圧の式で受働土圧を考
えると、次のようになる。As described above, the sand discharge and compaction member 16t in the device shown in Fig. 1
- Although we have described the case of discharging sand with the same diameter as the diameter of the outer pipe 15 without activating it, the sand discharge/compaction member 16 is operated to discharge compacted sand piles with a diameter larger than the diameter of the outer pipe 15. In the case of land reclamation, if we consider the passive earth pressure using the earth pressure formula on page 3, it will be as follows.
一般に、深度Ｚの受働土圧は
σ２＝γＺ＋２ｃ
であるが、管内にｕａ６γＺのりと気圧全作用させてい
ることから、中空管１の下端部の受働土圧σｊは
σ３＝γＺ＋２Ｃ−ｕａ
＝２ｃ
であり、強制上下動機構１７の押力Ｆは土被り正分だけ
少なくて済むことになる。Generally, the passive earth pressure at depth Z is σ2 = γZ + 2c, but since ua6γZ glue and atmospheric pressure are fully acting inside the pipe, the passive earth pressure σj at the lower end of the hollow pipe 1 is σ3 = γZ + 2C - ua = 2c Therefore, the pushing force F of the forced vertical movement mechanism 17 can be reduced by the amount of earth cover.
そして、σ３が２０に等しｂから、押力Ｆを強制上下動
機構１７の油圧で検知し、また造成中の砂杭断面積を深
度計１１と砂面計１２により検知すれば、三軸圧縮理論
全適用することより、Ｃすなわち原地盤強度全検知する
ことができる。Then, if σ3 is equal to 20 and b, the pushing force F is detected by the hydraulic pressure of the forced vertical movement mechanism 17, and the cross-sectional area of the sand pile being constructed is detected by the depth gauge 11 and the sand level gauge 12, the three-axis By fully applying the compression theory, C, that is, the full strength of the original ground can be detected.
第１図は本発明の実施において用いられる装置０１例を
示す概略図、第２図は中空管の下端の軌跡図、第３図は
設定圧力の説明図、第４図は給・排気操作の説明図であ
る。
なお、図中
１；中空管、２：砂投入ホッパー、３：貫入機、・・・
・・・である。
代理人 弁理士 染 谷 廣 司Fig. 1 is a schematic diagram showing an example of device 01 used in the implementation of the present invention, Fig. 2 is a locus diagram of the lower end of the hollow tube, Fig. 3 is an explanatory diagram of the set pressure, and Fig. 4 is the supply/exhaust operation. FIG. In addition, in the figure 1: hollow tube, 2: sand charging hopper, 3: penetration machine,...
...is... Agent Patent Attorney Hiroshi Sometani
Claims (1)
弱地盤中に排出させる工程において、中空管内の空気圧
が中空管下端における土圧に相当する下限設定圧力とこ
れより若干大きい上限設定圧力の間におさまるように、
給Φ排気操作を自動制御することを特徴とする砂杭造成
用中空管内の空気圧制御方法。In the process of supplying compressed air into a hollow pipe for sand pile construction and discharging it into the soft ground of gold dust inside the pipe, the air pressure inside the hollow pipe is set at a lower limit corresponding to the earth pressure at the lower end of the hollow pipe, and an upper limit set slightly higher than this. To fit between the pressure,
A method for controlling air pressure in a hollow pipe for sand pile construction, characterized by automatically controlling supply and exhaust operations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20107081A JPS58101922A (en) | 1981-12-14 | 1981-12-14 | Control or air pressure in hollow pipe for sand pile construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20107081A JPS58101922A (en) | 1981-12-14 | 1981-12-14 | Control or air pressure in hollow pipe for sand pile construction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58101922A true JPS58101922A (en) | 1983-06-17 |
| JPS6238485B2 JPS6238485B2 (en) | 1987-08-18 |
Family
ID=16434885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20107081A Granted JPS58101922A (en) | 1981-12-14 | 1981-12-14 | Control or air pressure in hollow pipe for sand pile construction |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58101922A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02289135A (en) * | 1989-04-25 | 1990-11-29 | Howa Mach Ltd | Cleaning apparatus for spinning frame |
| KR100492512B1 (en) * | 2005-03-15 | 2005-06-02 | (주)초석건설 | Crusher-stone drain pile method, crusher-stone compaction pile method of, using the auto pressurize device |
| KR100525034B1 (en) * | 2005-05-31 | 2005-11-01 | (주)수림건설 | Sand level real time automatic measuring method and equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0482381U (en) * | 1990-11-28 | 1992-07-17 |
-
1981
- 1981-12-14 JP JP20107081A patent/JPS58101922A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02289135A (en) * | 1989-04-25 | 1990-11-29 | Howa Mach Ltd | Cleaning apparatus for spinning frame |
| KR100492512B1 (en) * | 2005-03-15 | 2005-06-02 | (주)초석건설 | Crusher-stone drain pile method, crusher-stone compaction pile method of, using the auto pressurize device |
| KR100525034B1 (en) * | 2005-05-31 | 2005-11-01 | (주)수림건설 | Sand level real time automatic measuring method and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238485B2 (en) | 1987-08-18 |
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