JPH0833012B2 - How to fill a closed caisson - Google Patents
How to fill a closed caissonInfo
- Publication number
- JPH0833012B2 JPH0833012B2 JP7467189A JP7467189A JPH0833012B2 JP H0833012 B2 JPH0833012 B2 JP H0833012B2 JP 7467189 A JP7467189 A JP 7467189A JP 7467189 A JP7467189 A JP 7467189A JP H0833012 B2 JPH0833012 B2 JP H0833012B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- caisson
- filling
- sand
- closed
- 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
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- Revetment (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、護岸や防波堤の構築に際し、上面を閉鎖し
たケーソンに、中詰砂を水搬によって充填する密閉型ケ
ーソンの中詰方法の改良に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is an improvement of a method for filling a closed caisson in which a caisson whose upper surface is closed is filled with filling sand by water transfer when constructing a seawall or a breakwater. Regarding
（従来の技術） 従来、第４図、第５図に示すようにケーソン本体１の
上面を、これと一体の頂板２もしくは別体の蓋（図示せ
ず）によって閉鎖した密閉型ケーソンを水底の所定位置
に沈設し、頂板２にあけた注入口３より注入管４を通し
て中詰砂と水とのスラリーを送り込み、ケーソン本体１
内で中詰砂５を沈降分離させて堆積させ、余水を頂板２
の排水口６から排出させるようにした中詰方法が開発さ
れている。(Prior Art) Conventionally, as shown in FIG. 4 and FIG. 5, a closed type caisson, in which the upper surface of the caisson body 1 is closed by a top plate 2 integrated with the caisson body 1 or a separate lid (not shown), is installed on the bottom of the water. The slurry of the filling sand and water is sent from the pouring port 3 opened in the top plate 2 through the pouring pipe 4 to the caisson body 1
Inside sedimented sand 5 is settled and separated, and sewage is collected and top plate 2
A filling method has been developed in which the water is discharged from the drainage port 6 of.
なお、第４図、第５図において、7,7……はケーソン
本体１内を多数の隔室8,8……に仕切る隔璧であり、９
は各隔壁７に開口させた隔室8,8間を連通させる流通口
である。In FIGS. 4 and 5, reference numerals 7, 7 ... Are partition walls that divide the inside of the caisson body 1 into a large number of compartments 8, 8.
Is a flow port for communicating between the compartments 8, 8 opened in each partition 7.
（発明が解決しようとする課題） 上述した従来の水搬による中詰方法では、水とともに
搬入される中詰砂が流水の搬送速度がケーソン内で低下
することにより自重で沈降分離することを利用したもの
であり、ケーソン内に堆積する中詰砂の密度は、砂の締
った程度を表す指標である相対密度（Dr）で20〜50％程
度となっている。(Problems to be Solved by the Invention) In the conventional filling method by water transfer described above, it is used that sedimentation separation of the filling sand carried in together with water is carried out by its own weight because the transport speed of the flowing water decreases in the caisson. The density of the filling sand deposited in the caisson is about 20-50% in relative density (Dr) which is an index showing the degree of sand compaction.
一方、水底に設置されるケーソンは、自重によって安
定を保つものであるため、全体の重量が大きければそれ
だけ護岸や防波堤として効果的である。On the other hand, the caisson installed on the bottom of the water keeps its stability by its own weight, so if the weight of the whole is large, it is more effective as a seawall or breakwater.
本発明はこのような状況にかんがみ、従来の水搬によ
る密閉型ケーソンの中詰において、ケーソン内に堆積さ
れる中詰砂の密度をより高くし、ケーソンの安定度をよ
り高くすることのできる密閉型ケーソンの中詰方法の提
供を目的としたものである。In view of such a situation, the present invention can increase the density of the filling sand accumulated in the caisson and increase the stability of the caisson in the conventional filling of the closed caisson by water transportation. The purpose is to provide a method for filling the closed caisson.
（課題を解決するための手段） 上述の如き目的を達成するための本発明の特徴は、ケ
ーソン本体の上面を閉鎖した頂板にあけた注入口より中
詰砂と水とのスラリーを注入し、該ケーソン本体内で中
詰砂を沈降分離させ、余水を頂板の排水口から排出させ
つつ中詰砂を充填する密閉型ケーソンの中詰方法におい
て、前記ケーソン本体内の底面に透水材を敷設し、該透
水材の透水間隙に下端を連通させた通水管の上端側を前
記ケーソン本体の頂板より高く導出させ、該通水管にそ
の内部の流路を開閉するバルブを設け、前記中詰砂を充
填時に前記バルブを開いて排水させ、堆積砂中に下向き
の水流を生じさせることにある。(Means for Solving the Problems) A feature of the present invention for achieving the above-described object is to inject a slurry of filling sand and water from an inlet opened in a top plate that closes the upper surface of a caisson body, A method for filling a closed caisson in which caustic sand is settled and separated in the caisson body, and residual water is discharged from a drainage port of a top plate, and a permeable material is laid on the bottom surface of the caisson body. Then, the upper end side of the water pipe whose lower end is communicated with the water permeable gap of the water permeable material is led out higher than the top plate of the caisson body, and the water pipe is provided with a valve for opening and closing the flow passage therein, Is to open the valve at the time of filling to drain the water and to cause a downward water flow in the sediment.
（作用） この方法では、中詰の途中、例えば中詰砂が一定高さ
堆積毎、あるいは充填末期の内圧上昇時に通水管のバル
ブを開くと、ケーソン内の底部が減圧されることになり
堆積した中詰砂中に下向きの水流が生じ、砂粒間隙が透
水材及び通水管を通してケーソン該に排出される。この
ときの下向きの水流によって、堆積した中詰砂に浸透圧
が作用し、これによって堆積密度が高められる。(Operation) In this method, when the filling sand is piled up at a certain height during filling, or when the valve of the water pipe is opened at the end of filling when the internal pressure rises, the bottom of the caisson will be depressurized. A downward water flow is generated in the filled sand, and the sand grain gap is discharged to the caisson through the water permeable material and the water pipe. At this time, the downward water flow exerts an osmotic pressure on the accumulated inner sand, thereby increasing the accumulation density.
（実施例） 次に本発明の実施例を第１図〜第３図について説明す
る。なお前述した従来技術と同じ部分には同じ符号を付
して、その説明を省略する。(Embodiment) Next, an embodiment of the present invention will be described with reference to FIGS. The same parts as those of the above-mentioned conventional technique are designated by the same reference numerals, and the description thereof will be omitted.
この方法では、ケーソンの作成時に各隔室の8,8……
の底面に、例えば、土木用暗渠集排水材あるいは連続気
泡を有する発泡コンクリート板等の透水材11を敷設し、
その透水材11内に通水管12の下端を嵌め込み、透水間隙
に連通させ、その通水管12の上端を頂板２を貫通させて
上方に突出させ、その突出部分にバルブ13を取り付け、
通水管12内の流路を開閉できるようにしておく。With this method, 8,8 of each compartment when creating the caisson ...
On the bottom surface of, for example, lay a water permeable material 11 such as an underground drainage drainage material for civil engineering or a foam concrete plate having open cells,
The lower end of the water-permeable pipe 12 is fitted into the water-permeable material 11 so as to communicate with the water-permeable gap, the upper end of the water-permeable pipe 12 penetrates the top plate 2 to project upward, and the valve 13 is attached to the projecting portion.
The passage in the water pipe 12 is opened and closed.
このように透水材11、及び通水管12をあらかじめ取り
付けた状態でケーソン本体１を水底に沈設し、始めはバ
ルブ13を閉じた状態で注入口３より中詰砂と水とのスラ
リーを注入し、各隔室8,8……内に流し込み、中詰砂５
を沈降分離させて堆積させ、余水を排水口６から排水さ
せる。In this way, the caisson body 1 is submerged in the water bottom with the water-permeable material 11 and the water pipe 12 attached in advance, and at the beginning, with the valve 13 closed, the slurry of the filling sand and water is injected from the injection port 3. , Pour into each compartment 8,8 ……, and fill with sand 5
Is settled and deposited, and spilled water is drained from the drainage port 6.
このようにして一定量の中詰砂５を堆積させた後、バ
ルブ13を開く。このときケーソン本体１内は、スラリー
を注入することにより、ケーソン内流路の摩擦損失、
隔璧流通口のオリフィス損失、排水口の急縮損失、
排水管路の摩擦損失、残留速度水頭、放水口揚程
等が要因となって常時0.2kg/cm2程度の内圧がかかって
いる。この内圧上昇は、第２図、第３図に示すように中
詰砂５の充填末期においては、ケーソン内流路の摩擦損
失、隔壁流通口のオリフィス損失及び排水管路の摩擦損
失が大きくなってケーソン本体１内が高圧化する。この
ためバルブ13が開かれると、隔室６の底部が透水材11及
び通水管12を通して大気に開放されるため、底部が低圧
となり、堆積中詰砂５内の間隙水に下向きの流れが生
じ、これが通水管12を通り、ケーソン本体１外に排出さ
れる。この間隙水の下向きの流水によって、堆積した中
詰砂５に （H1/li）×ρω ここにH1は水頭差、liは堆積層厚、ρωは海水の単位体
積重量を意味する の浸透圧が作用し、これによって堆積が高められる。After depositing a certain amount of the filling sand 5 in this way, the valve 13 is opened. At this time, by injecting the slurry into the caisson body 1, friction loss of the flow path in the caisson,
Orifice loss at the wall flow port, rapid compression loss at the drain port,
Internal pressure of about 0.2 kg / cm 2 is constantly applied due to factors such as friction loss in the drainage pipe, residual velocity head, and head of outlet. As shown in FIGS. 2 and 3, this increase in internal pressure causes a large friction loss in the caisson internal flow passage, an orifice loss in the partition wall flow passage, and a drainage pipe friction loss at the end of the filling of the filling sand 5. Then, the pressure inside the caisson body 1 is increased. Therefore, when the valve 13 is opened, the bottom portion of the compartment 6 is opened to the atmosphere through the water permeable material 11 and the water passage pipe 12, so that the bottom portion has a low pressure and a downward flow is generated in the pore water in the sedimentation sand 5 This passes through the water pipe 12 and is discharged to the outside of the caisson body 1. Due to this downward flow of pore water, (H 1 / li) × ρω where H 1 is the head difference, li is the thickness of the sedimentary layer, and ρω is the unit volume weight of seawater. Pressure is exerted, which enhances deposition.
なお、上述の実施例では通水管12をケーソン内を通し
て上方に導出しているが、ケーソン外に沿わせて上方に
導出してもよいものである。Although the water pipe 12 is led out upward through the inside of the caisson in the above-described embodiment, it may be led out upward along the outside of the caisson.
（発明の効果） 上述したように本発明の密閉型ケーソン本体底部に透
水材を敷設し、その透水間隙に連通させて通水管をケー
ソン上方に導出させ、中詰砂充填時に通水管を開放さ
せ、堆積中詰砂に浸透圧を作用させるようにしたため、
従来に比べて中詰砂の堆積密度を著しく高いものとする
ことができることとなったものであり、ケーソンの安定
化が増進されることとなったものである。(Effect of the invention) As described above, a water-permeable material is laid on the bottom of the closed caisson body of the present invention, and the water-permeable pipe is led out above the caisson by communicating with the water-permeable gap, and the water-permeable pipe is opened when filling the filling sand. Since the osmotic pressure is applied to the packed sand during the deposition,
Compared with the conventional method, the sedimentation density of the medium sand can be made extremely high, and the stabilization of the caisson is promoted.
第１図は本発明の実施例を示すケーソンの断面図、第２
図は中詰砂充填末期の状態のケーソン内流路を示す縦断
面図、第３図は同横断面図、第４図は従来の密閉型ケー
ソンの構造を示す部分横断面図、第５図は同縦断面図で
ある。 １……ケーソン本体、２……頂板、３……注入口、４…
…注入管、５……中詰砂、６……排水口、７……隔壁、
８……隔室、９……流通口、11……透水材、12……通水
管、13……バルブ。FIG. 1 is a sectional view of a caisson showing an embodiment of the present invention, and FIG.
The figure is a longitudinal sectional view showing the flow path inside the caisson in the final stage of filling of the filling sand, FIG. 3 is the same transverse sectional view, and FIG. 4 is a partial transverse sectional view showing the structure of a conventional closed caisson. Is a vertical sectional view of the same. 1 ... Caisson body, 2 ... Top plate, 3 ... Injection port, 4 ...
… Injection pipe, 5 …… Medium sand, 6 …… Drainage port, 7 …… Separator,
8 ... compartment, 9 ... flow port, 11 ... permeable material, 12 ... water pipe, 13 ... valve.
Claims (1)
た注入口より中詰砂と水とのスラリーを注入し、該ケー
ソン本体内で中詰砂を沈降分離させ、余水を頂板の排水
口から排出させつつ中詰砂を充填する密閉型ケーソンの
中詰方法において、前記ケーソン本体内の底面に透水材
を敷設し、該透水材の透水間隙に下端を連通させた通水
管の上端側を前記ケーソン本体の頂板より高く導出さ
せ、該通水管にその内部の流路を開閉するバルブを設
け、前記中詰砂を充填時に前記バルブを開いて排水さ
せ、堆積砂中に下向きの水流を生じさせることを特徴と
してなる密閉型ケーソンの中詰方法。Claim: What is claimed is: 1. A slurry of filling sand and water is injected from an inlet provided in a top plate with the upper surface of the caisson body closed, and the filling sand is sedimented and separated in the caisson body, and residual water is drained from the top plate. In a method of filling a closed type caisson that is filled with filling sand while discharging from the mouth, a water-permeable material is laid on the bottom surface of the caisson body, and the lower end of the water-permeable pipe is connected to the water-permeable gap of the water-permeable material. Is provided higher than the top plate of the caisson body, and a valve for opening and closing a flow path inside the caisson body is provided, and the valve is opened when the filling sand is filled to allow drainage, and a downward water flow in the accumulated sand. A method for filling a closed caisson, which is characterized in that it is produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7467189A JPH0833012B2 (en) | 1989-03-27 | 1989-03-27 | How to fill a closed caisson |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7467189A JPH0833012B2 (en) | 1989-03-27 | 1989-03-27 | How to fill a closed caisson |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02252821A JPH02252821A (en) | 1990-10-11 |
| JPH0833012B2 true JPH0833012B2 (en) | 1996-03-29 |
Family
ID=13553928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7467189A Expired - Lifetime JPH0833012B2 (en) | 1989-03-27 | 1989-03-27 | How to fill a closed caisson |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0833012B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5950809B2 (en) | 2012-12-12 | 2016-07-13 | 株式会社日立製作所 | Passenger conveyor |
-
1989
- 1989-03-27 JP JP7467189A patent/JPH0833012B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5950809B2 (en) | 2012-12-12 | 2016-07-13 | 株式会社日立製作所 | Passenger conveyor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02252821A (en) | 1990-10-11 |
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