JPH0584772B2 - - Google Patents
Info
- Publication number
- JPH0584772B2 JPH0584772B2 JP14457888A JP14457888A JPH0584772B2 JP H0584772 B2 JPH0584772 B2 JP H0584772B2 JP 14457888 A JP14457888 A JP 14457888A JP 14457888 A JP14457888 A JP 14457888A JP H0584772 B2 JPH0584772 B2 JP H0584772B2
- Authority
- JP
- Japan
- Prior art keywords
- caisson
- ground
- friction
- gel
- main body
- 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 - Fee Related
Links
- 239000011347 resin Substances 0.000 claims description 20
- 229920005989 resin Polymers 0.000 claims description 20
- 238000010276 construction Methods 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 2
- 239000002250 absorbent Substances 0.000 description 16
- 230000002745 absorbent Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000004519 grease Substances 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 2
- 239000000440 bentonite Substances 0.000 description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- -1 CaCl 2 and Ca(OH) 2 Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
Landscapes
- Revetment (AREA)
Description
【発明の詳細な説明】
《産業上の利用分野》
この発明は、ケーソン工法に関し、特に、ケー
ソンの沈設時の周面摩擦を低減させる工法に関す
る。DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a caisson construction method, and more particularly to a construction method for reducing peripheral surface friction during caisson installation.
《従来の技術》
周知のように、橋脚などの基礎の構築工法の一
種としてケーソン工法があり、この工法では、筒
状ないしは箱状の構造物を地盤中の支持層まで沈
設し、荷重を地盤に伝達する。<Prior Art> As is well known, the caisson method is a type of construction method for foundations such as bridge piers. In this method, a cylindrical or box-shaped structure is sunk down to the supporting layer in the ground, and the load is transferred to the ground. to communicate.
この種のケーソン工法は、オープンケーソン工
法とニユーマチツクケーソン工法とに大別される
が、これらの工法において技術的に最も重要な課
題は、ケーソンの沈設時にいかにして周面摩擦力
を小さくするかにある。 This type of caisson construction method is roughly divided into open caisson construction method and neutral caisson construction method, but the most important technical issue in these construction methods is how to reduce the peripheral surface friction force when sinking the caisson. There's something to be said for it.
特に、大型ないしは大深度に設置されるケーソ
ンや、人工島の中詰土中に沈設されるケーソンで
は、その周面摩擦の低減が工事の成否に重大な影
響を及ぼす。 In particular, for caissons that are large or installed at great depths, or caissons that are submerged in the soil of an artificial island, reducing the friction on their circumferential surfaces has a significant impact on the success or failure of construction.
このため、従来から、ケーソンの沈設時に、周
面摩擦を低減する方法として、ケーソンの外周に
フリクシヨンカツト部を設けるとともに、ケーソ
ンの外周面と地盤との間に空気あるいは水をジエ
ツエツト噴射させる方法、ベントナイトを注入す
る方法などが採用されていた。 For this reason, conventional methods for reducing circumferential friction when sinking a caisson include providing a friction cut on the outer circumference of the caisson and jetting air or water between the outer circumferential surface of the caisson and the ground. , methods such as injecting bentonite were adopted.
しかしながら、このような周面摩擦低減方法に
はいずれも以下に説明する技術的課題があつた。 However, all of these circumferential surface friction reduction methods have the following technical problems.
《発明が解決しようとする課題》
すなわち、前者の方法では、ケーソンの側壁に
予め配管を設けておき、この配管を介して空気あ
るいは水をジエツト噴射させるが、ジエツト噴射
の噴射口が間欠的に設けられているので、噴射に
よる摩擦低減効果が局所的にしか得られないとと
もに、摩擦低減効果はジエツト噴射を行つている
期間でのみ得られ、効果の持続性がなかつた。<<Problems to be Solved by the Invention>> In other words, in the former method, piping is provided in advance on the side wall of the caisson, and air or water is jet-injected through this piping, but the jet injection nozzle is intermittently Because of this, the friction-reducing effect due to injection could only be obtained locally, and the friction-reducing effect was only obtained during the jet injection, and the effect was not sustainable.
また、後者の方法では、ケーソンを沈設した後
にその外周面と地盤との間にベントナイトが残留
するので、施工後に周面摩擦力が回復せず、ケー
ソンの安定に悪影響を及ぼすという問題があつ
た。 In addition, in the latter method, bentonite remains between the outer circumferential surface of the caisson and the ground after it is sunk, so the circumferential frictional force does not recover after construction, which has a negative effect on the stability of the caisson. .
この発明はこのような従来の問題点に鑑みてな
されたものであつて、その目的とするところは、
外周面の全域に亘つて継続的な摩擦低減効果が得
られるとともに、沈設後に簡単に周面摩擦力が回
復できるケーソン工法を提供することにある。 This invention was made in view of these conventional problems, and its purpose is to:
It is an object of the present invention to provide a caisson construction method in which a continuous friction reduction effect can be obtained over the entire area of the outer circumferential surface, and the circumferential surface friction force can be easily recovered after being sunk.
《問題点を解決するための手段》
上記目的を達成するために、この発明は、ケー
ソンを地盤中に沈設する際に、ケーソンの外周面
と地盤との間にノリ状の高吸水性樹脂ゲルを注入
するとともに、前記ケーソンを所定の深度に沈設
した後に、前記ケーソンの外周面と地盤との間に
解ゲル剤を注入することを特徴とする。<Means for Solving the Problems> In order to achieve the above object, the present invention provides a glue-like super absorbent resin gel between the outer peripheral surface of the caisson and the ground when the caisson is sunk into the ground. In addition, after the caisson is sunk to a predetermined depth, a degelling agent is injected between the outer peripheral surface of the caisson and the ground.
《作用》
上記構成のケーソン工法によれば、沈設する際
に、ノリ状の高吸水性樹脂ゲルがケーソンの外周
面と地盤との間に介在するので、ノリ状の高吸水
性樹脂ゲルのグリース作用により、十分な摩擦低
減効果が得られるともに、高吸水性樹脂ゲルは取
込んだ水分を圧力が加えられても簡単に放出しな
いので、グリース作用は長期間維持される。《Operation》 According to the caisson construction method with the above configuration, when the caisson is submerged, the paste-like super-absorbent resin gel is interposed between the outer peripheral surface of the caisson and the ground, so the paste-like super-absorbent resin gel grease As a result of this action, a sufficient friction reduction effect is obtained, and since the superabsorbent resin gel does not easily release the absorbed moisture even when pressure is applied, the grease action is maintained for a long period of time.
また、ノリ状の高吸水性樹脂ゲルは、例えば、
解ゲル剤としてCaCl2，Ca（OH）2などの塩類を注
入すれば簡単に解ゲルされるので、沈設後に周面
摩擦力が回復できる。 In addition, glue-like super absorbent resin gel, for example,
If salts such as CaCl 2 or Ca(OH) 2 are injected as a degelling agent, the gel can be easily degelled, so that the circumferential frictional force can be restored after being deposited.
《実施例》
以下、この発明の好適な実施例について添付図
面を参照にして詳細に説明する。<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
第１図は、この発明にかかるケーソン工法の一
実施例を示している。 FIG. 1 shows an embodiment of the caisson construction method according to the present invention.
同図に示す工法は、この発明をオープンケーソ
ンに適用した場合を例示しており、ケーソン１０
は鉄筋コンクリート製であつて、下端の刃口部１
２と、その上部に形成された本体部１４とから構
成されている。 The construction method shown in the figure exemplifies the case where this invention is applied to an open caisson,
is made of reinforced concrete, and the cutting edge part 1 at the lower end is made of reinforced concrete.
2, and a main body portion 14 formed on the top thereof.
本体部１４は刃口部１２の外径よりも小さくな
つていて、これらの接続部分に段差部１６が形成
され、刃口部１２の沈下により本体部１４の外周
面と周辺地盤１８との間に間〓を形成し、本体部
１４の周面摩擦を低減させるためのフリクシヨン
カツト部２０が設けられている。 The main body part 14 is smaller in outer diameter than the cutting edge part 12, and a stepped part 16 is formed at the connection part between them, and due to the sinking of the cutting edge part 12, there is a gap between the outer peripheral surface of the main body part 14 and the surrounding ground 18. A friction cut portion 20 is provided to form a gap between the ends and reduce friction on the circumferential surface of the main body portion 14.
本体部１４内には、縦方向に沿つて延びる複数
の通路２２が、例えば、パイプを埋設する方法な
どによつて形成され、通路２２の下端はフリクシ
ヨンカツト部２０に開口する吐出口２４に連通さ
れるとともに、本体部１４の上端に開口する通路
２２の上端には、ホース２３が接続されている。 A plurality of passages 22 extending in the longitudinal direction are formed in the main body part 14 by, for example, burying a pipe, and the lower ends of the passages 22 are connected to a discharge port 24 that opens into the friction cut part 20. A hose 23 is connected to the upper end of the passage 22 that communicates with the main body 14 and opens at the upper end of the main body 14 .
上記吐出口２４は、環状に形成された段差部１
６の周方向に沿つて所定の間隔をおいて多数設け
られている。 The discharge port 24 has a stepped portion 1 formed in an annular shape.
A large number of them are provided at predetermined intervals along the circumferential direction of 6.
そして、ホース２３の他端は、ポンプ２６と第
１および第２の開閉バルブ２８，３０を介して、
ノリ状の高吸水性樹脂ゲルＡが収容された第１の
タンク３２および解ゲル剤Ｂが収容された第２の
タンク３４と接続されている。 The other end of the hose 23 is connected to the pump 26 and the first and second on-off valves 28 and 30.
It is connected to a first tank 32 containing glue-like superabsorbent resin gel A and a second tank 34 containing gel-resolving agent B.
ケーソン１０を沈設する際には、第１の開閉バ
ルブ２８を開弁しかつ、ポンプ２６を駆動するこ
とによつて、吐出口２４からノリ状の高吸水性樹
脂ゲルＡをフリクシヨンカツト部２０に注入す
る。 When sinking the caisson 10, by opening the first opening/closing valve 28 and driving the pump 26, a glue-like super absorbent resin gel A is applied to the friction cut portion 20 from the discharge port 24. Inject into.
注入されたノリ状の高吸水性樹脂ゲルＡは、段
差部１６の周方向に沿つて設けられた吐出口２４
から環状に供給され、ケーソン１０の沈設に伴な
つて、その本体部１４の外周面の全周で層状に介
在し、ノリ状の高吸水性樹脂ゲルＡのグリース作
用により、本体部１４と地盤１８との間の摩擦力
は大幅に低下する。 The injected glue-like super absorbent resin gel A is discharged through the discharge port 24 provided along the circumferential direction of the stepped portion 16.
As the caisson 10 is sunk, the grease action of the glue-like super absorbent resin gel A, which is interposed in a layer around the entire outer circumferential surface of the main body 14, connects the main body 14 and the ground. 18 is significantly reduced.
ここで用いられるノリ状の高吸水性樹脂ゲルＡ
は、通常用いられている球状の高吸水性樹脂ゲル
となり、フレーク状の高吸水性樹脂に水を添加し
てノリ状としたものである。 Glue-like super absorbent resin gel A used here
This is a commonly used spherical super-absorbent resin gel, which is made into a paste-like gel by adding water to a flaky super-absorbent resin.
このようにノリ状にされた高吸水性樹脂ゲルＡ
は、周囲の土圧がこれに加えられた場合でも、一
旦吸収した水分をほとんど放出しないので、その
グリース作用は長期に亘つて維持される。 Super absorbent resin gel A made into a paste shape in this way
Even when surrounding earth pressure is applied to it, it releases almost no moisture once absorbed, so its greasing action is maintained over a long period of time.
なお、ノリ状の高吸水性樹脂ゲルＡの注入は、
ケーソン１０の沈設時の早期には、周面摩擦力が
比較的小さいので、載荷重だけで沈設を行い、沈
設が進行して周面摩擦力が大きくなつて、載荷重
だけでは沈設が困難になつた状態で注入するよう
にしても良い。 In addition, injection of glue-like super absorbent resin gel A is as follows:
In the early stages of sinking the caisson 10, the circumferential surface friction force is relatively small, so sinking is carried out using only the loading load, and as the sinking progresses, the circumferential surface frictional force becomes large and it becomes difficult to sink the caisson 10 using the loading load alone. It may be injected in a wet state.
また、本体部１４は、予め製作したものを順次
刃口部１２上に組み立てる方法と、現場でこれを
構築する方法のいずれでも良い。 Further, the main body part 14 may be manufactured in advance and sequentially assembled onto the cutting edge part 12, or it may be constructed on site.
以上のようにしてケーソン１０がその周面摩擦
を低減させながら所定深度まで沈設されると、第
１のバルブ２８を閉弁した後第２のバルブ３０を
開弁して、本体部１４の外周に介在させられてい
るノリ状の高吸水性樹脂ゲルＡの解ゲルが行われ
る。 When the caisson 10 is sunk to a predetermined depth while reducing the friction on its circumferential surface as described above, the first valve 28 is closed and the second valve 30 is opened, thereby reducing the outer circumference of the main body 14. The glue-like super absorbent resin gel A interposed in the gel is degelled.
この解ゲル操作は、ポンプ２６を介して解ゲル
剤Ｂを、例えば、CaCl2，Ca（OH）2などの塩類を
フリクシヨン部２０に注入することによつて行わ
れ、この操作によりノリ状の高吸水性樹脂ゲルＡ
は解ゲルされて吸収した水を放出する。 This gel-resolving operation is performed by injecting gel-resolving agent B, for example, salts such as CaCl 2 and Ca(OH) 2 , into the friction section 20 through the pump 26, and this operation causes a paste-like Super absorbent resin gel A
is degelled and releases the absorbed water.
これにより、ケーソン１０の本体部１４の外周
は地盤１８と接触して、本体部１４の周面摩擦力
は回復する。 As a result, the outer periphery of the main body 14 of the caisson 10 comes into contact with the ground 18, and the peripheral surface friction force of the main body 14 is restored.
その際、解ゲルされた高吸水性樹脂は再度吸水
することはなく、糸くず状の集合体に変換し、本
体部１４の周辺摩擦力の増加に寄与する。 At this time, the degelled superabsorbent resin does not absorb water again, but is converted into a thread-like aggregate, contributing to an increase in the peripheral frictional force of the main body portion 14.
なお、上記実施例では、この発明をオープンケ
ーソンに適用したものを例示したが、ニユーマチ
ツクケーソンにも勿論適用できる。 In the above embodiment, the present invention is applied to an open caisson, but it can of course be applied to a pneumatic caisson as well.
《発明の効果》
以上実施例で説明したように、この発明にかか
るケーソン工法によれば、ケーソンを地盤中に沈
設する際に、ケーソンの外周面と地盤との間にノ
リ状の高吸水性樹脂ゲルを注入するとともに、前
記ケーソンを所定の深度に沈設した後に、前記ケ
ーソンの外周面と地盤との間に解ゲル剤を注入す
るので、沈設時の周面摩擦が大幅に低減され、沈
設が容易になるとともに、摩擦力が均等になりケ
ーソンの傾斜や水平移動が少なくなる。<<Effects of the Invention>> As explained above in the embodiments, according to the caisson construction method according to the present invention, when the caisson is sunk into the ground, a glue-like highly absorbent layer is formed between the outer peripheral surface of the caisson and the ground. In addition to injecting resin gel, a degelling agent is injected between the outer circumferential surface of the caisson and the ground after the caisson has been sunk to a predetermined depth, so that the friction on the circumferential surface during sinking is significantly reduced, making it easier to sink the caisson. At the same time, the frictional force is evened out, reducing tilting and horizontal movement of the caisson.
また、沈設後に解ゲル剤を注入すれば周面摩擦
力が回復するので、特に、大型のケーソンや大深
度に設置するケーソンおよび人工島内に設置する
ケーソンに有効となる。 In addition, if a gel-resolving agent is injected after the caisson is deposited, the peripheral surface frictional force will be restored, which is particularly effective for large caissons, caissons installed at great depths, and caissons installed inside artificial islands.
第１図は本発明方法の一実施例の施工状態を示
す断面図である。
１０……ケーソン、１２……刃口部、１４……
本体部、２４……吐出口、Ａ……ノリ状の高吸水
性樹脂ゲル、Ｂ……解ゲル剤。
FIG. 1 is a sectional view showing a construction state of an embodiment of the method of the present invention. 10...caisson, 12...blade mouth part, 14...
Main body part, 24... Discharge port, A... Glue-like super absorbent resin gel, B... Gel dissolving agent.
Claims (1)
の外周面と地盤との間にノリ状の高吸水性樹脂ゲ
ルを注入するとともに、前記ケーソンを所定の深
度に沈設した後に、前記ケーソンの外周面と地盤
との間に解ゲル剤を注入することを特徴とするケ
ーソン工法。1. When sinking the caisson into the ground, a glue-like superabsorbent resin gel is injected between the outer peripheral surface of the caisson and the ground, and after the caisson is sunk to a predetermined depth, the outer peripheral surface of the caisson is A caisson construction method characterized by injecting a degelling agent between the ground and the soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14457888A JPH01315529A (en) | 1988-06-14 | 1988-06-14 | Caisson method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14457888A JPH01315529A (en) | 1988-06-14 | 1988-06-14 | Caisson method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01315529A JPH01315529A (en) | 1989-12-20 |
| JPH0584772B2 true JPH0584772B2 (en) | 1993-12-03 |
Family
ID=15365417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14457888A Granted JPH01315529A (en) | 1988-06-14 | 1988-06-14 | Caisson method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01315529A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5674423B2 (en) * | 2010-11-10 | 2015-02-25 | 独立行政法人鉄道建設・運輸施設整備支援機構 | Ground improvement method in caisson method |
| JP2013087603A (en) * | 2011-10-22 | 2013-05-13 | Fukuda Corp | Immersion method for caisson |
| JP6552204B2 (en) * | 2015-01-28 | 2019-07-31 | 大成建設株式会社 | Caisson settling method and friction cut structure |
-
1988
- 1988-06-14 JP JP14457888A patent/JPH01315529A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01315529A (en) | 1989-12-20 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |