JP4194453B2 - Water stop method for steel sheet pile joints - Google Patents
Water stop method for steel sheet pile joints Download PDFInfo
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- JP4194453B2 JP4194453B2 JP2003308286A JP2003308286A JP4194453B2 JP 4194453 B2 JP4194453 B2 JP 4194453B2 JP 2003308286 A JP2003308286 A JP 2003308286A JP 2003308286 A JP2003308286 A JP 2003308286A JP 4194453 B2 JP4194453 B2 JP 4194453B2
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Description
本発明は、土木、建築等に利用される鋼矢板に関し、特に鋼矢板の継手の止水方法に関する。 The present invention relates to a steel sheet pile used for civil engineering, construction, and the like, and more particularly, to a water stop method for a steel sheet pile joint.
鋼矢板は、その幅方向の両端に設けた継手を互いに組み合わせて嵌合し、壁を形成できるので、港湾、河川等の土木や建築工事に利用される。この鋼矢板としては、種々の構造があるが、熱間圧延で大量生産ができて経済的なことから、図２、図７に示されるように継手が断面視で爪状をなす所謂「ラルゼン型鋼矢板」や「直線型鋼矢板」が多用されている。 Steel sheet piles can be used by combining joints provided at both ends in the width direction to form a wall and thus can be used for civil engineering and construction work such as harbors and rivers. Although this steel sheet pile has various structures, it is economical because it can be mass-produced by hot rolling and is economical, so that the joint has a claw-like shape in cross section as shown in FIGS. “Striped steel sheet pile” and “Straight steel sheet pile” are frequently used.
鋼矢板壁は廃棄物最終処分場や汚染土壌等から流出する汚染水の拡散を防止する鉛直遮水壁として用いられることがある。高い止水性を求められる場合、事前に鋼矢板の継手部に水膨脹性の止水材を塗布する方法が一般的に用いられている。打設後に継手部の止水材が３〜５倍に膨潤することによって継手部の隙間が埋められ、止水性を発揮する。 Steel sheet pile walls are sometimes used as vertical impermeable walls to prevent the diffusion of contaminated water flowing out from waste final disposal sites or contaminated soil. When a high water-stopping property is required, a method of applying a water-expandable water-stopping material to the joint portion of the steel sheet pile in advance is generally used. When the water-stopping material of the joint part swells 3 to 5 times after the placement, the gap of the joint part is filled and water-stopping is exhibited.
しかしながら、鋼矢板の打設時に継手部同士の摩擦や地盤との摩擦により止水材が剥離・損傷することがあり、十分な止水性能を確保できないことがあった。また止水材は雨水などにさらされると膨潤して打設ができなくなるため、保管や運搬時に雨水等がかからないように考慮する必要がある。 However, when the steel sheet pile is placed, the water-stopping material may be peeled off or damaged due to friction between the joint portions or friction with the ground, and sufficient water-stopping performance may not be ensured. Further, since the water-stopping material swells when placed in rainwater and cannot be placed, it is necessary to consider that rainwater or the like is not applied during storage or transportation.
さらに海面処分場に鋼矢板を用いる際は、鋼矢板を打設した後に波による繰り返し荷重や、沈下による鋼矢板の変形に伴い、継手部間のずれが生じ、鋼矢板に塗布した止水材が損傷を受ける懸念がある。このため、鋼矢板の打設は海面を陸地化したのちに打設するように限定されていた。陸地化した後に鋼矢板を打設する際は打設長が大きいため、継手部間に摩擦熱が生じ、これにより継手部に塗布した止水材が悪影響を受ける懸念があった。 Furthermore, when using steel sheet piles at the sea surface disposal site, after the steel sheet piles have been placed, due to repeated loading by waves and deformation of the steel sheet piles due to subsidence, displacement between the joints occurs, and the waterstop material applied to the steel sheet piles There are concerns about being damaged. For this reason, the placement of steel sheet piles was limited to being placed after the sea surface was landed. When the steel sheet pile is cast after land formation, the casting length is long, so that frictional heat is generated between the joints, which may adversely affect the water stop material applied to the joints.
これらの問題を解決するため、本出願人は、断面視で鋼矢板の継手の内底部内面側に凹溝を有する鋼矢板を地盤に打設すると共に、継手を連設して壁を施工するに際して、鋼矢板の打設後に爪底部の凹溝に水膨脹性の高い止水材を上方より充填する鋼矢板の施工方法（特許文献１、請求項１参照）や、爪底部の凹溝に事前に棒状止水材を挿入し、その後鋼矢板を打設する方法（特許文献１、請求項３参照）を提案している。この施工方法によれば、止水性の優れた遮水壁を構築することができる。
In order to solve these problems, the present applicant places a steel sheet pile having a concave groove on the inner surface of the inner surface of the joint of the steel sheet pile in a cross-sectional view, and constructs a wall by connecting the joint continuously. At the time, a steel sheet pile construction method (see
本発明は、上記施工方法と同様な、断面視で鋼矢板の継手の爪底部内面側に凹溝を有する鋼矢板を利用して、止水性の優れた遮水壁を構築することができる新たな鋼矢板の継手の止水方法を提供することを目的とする。 The present invention is similar to the above construction method, and it is possible to construct a water-impervious wall having excellent water blocking properties by using a steel sheet pile having a groove on the inner surface side of the claw bottom portion of the joint of the steel sheet pile in a sectional view. An object of the present invention is to provide a water stop method for a steel sheet pile joint.
鋼矢板の継手同士の隙間ｄｘは打設状況によって１〜９ｍｍ程度にばらつく。本発明者は、図１の止水材粘性と開口幅ｄｘとの関係に示されるように、低粘性の止水材を凹溝に注入すると隙間ｄｘから止水材が漏れてしまい、一方１０〜５５Ｐａ・ｓの高粘性の止水材を凹溝に注入すると止水材が隙間ｄｘに残ることを知見した。 The gap dx between the steel sheet pile joints varies from about 1 to 9 mm depending on the driving conditions. As shown in the relationship between the viscosity of the water-stopping material and the opening width dx in FIG. 1, the inventor leaks the water-stopping material from the gap dx when the low-viscosity water-stopping material is injected into the concave groove. It has been found that when a highly viscous water-stopping material of ˜55 Pa · s is injected into the groove, the water-stopping material remains in the gap dx.
請求項１〜３の発明はこのような知見に基づいてなされたものである。請求項１の発明は、断面視で、継手の爪底部内面側に止水材が充填される凹溝が形成される鋼矢板を打設嵌合した後に、前記爪底部の前記凹溝に前記止水材を注入するための注入用パイプを挿入し、その後、前記注入用パイプの先端が前記止水材の上面付近に位置するように、前記注入用パイプを引き上げながら前記止水材を注入することを特徴とする。
The inventions of
請求項２の発明は、請求項１に記載の鋼矢板の継手の止水方法において、前記止水材の粘性は３０〜５０Ｐａ・ｓであることを特徴とする。
Invention of
請求項３の発明は、断面視で、継手の爪底部内面側に止水材が充填される凹溝が形成される鋼矢板を打設嵌合した後に、前記爪底部の前記凹溝に、粘性が３０〜５０Ｐａ・ｓの止水材を注入することを特徴とする。
The invention of
請求項１の発明によれば、高粘性の止水材を鋼矢板の爪底部の凹溝に途切れることなく充填することができ、したがって止水性の優れた遮水壁を構築することができる。 According to the first aspect of the present invention, a highly viscous water-stopping material can be filled in the grooves at the bottom of the claw bottom of the steel sheet pile without interruption, so that a water-impervious wall having excellent water-stopping properties can be constructed.
請求項２の発明によれば、止水材が鋼矢板の継手同士の隙間ｄｘから漏れ出ることがない。
According to invention of
請求項３の発明によれば、止水材が鋼矢板の継手同士の隙間ｄｘから漏れ出ることがないので、止水性の優れた遮水壁を構築することができる。
According to invention of
本発明の対象となる鋼矢板は、断面視で継手部の内面側に止水材が充填される凹溝が形成される鋼矢板である。図２はこのような鋼矢板の一例としてラルゼン継手を有する鋼矢板を示す。この鋼矢板は、断面視で、水平なウェブ１と、その幅方向両端を同じ向きに傾斜させたフランジ部２と、該フランジ部２の先端に設けられた爪状のラルゼン継手３を備える。ラルゼン継手３の爪底部の内面側には止水材を充填する凹溝４が熱間圧延で形成される。ここで爪底部とは爪５の根元とフランジ部２の根元を形成する部分である。
The steel sheet pile which is the object of the present invention is a steel sheet pile in which a concave groove filled with a water stop material is formed on the inner surface side of the joint portion in a cross-sectional view. FIG. 2 shows a steel sheet pile having a Larsen joint as an example of such a steel sheet pile. This steel sheet pile includes a
以下ラルゼン型継手の例で本発明の実施形態を説明する。まず鋼矢板の打設に先立って、ラルゼン継手３の隙間から止水材が漏洩するのを防止するため漏洩防止材を塗布する。漏洩防止材は、鋼矢板の打設に影響を及ぼさない程度の硬さで、打設時の摩擦で剥離しにくい接着性が必要である。また、継手の嵌合状態により隙間の大きさが変化するため、鋼矢板打設後に膨脹する物質が望ましい。この条件を満たす物質としては例えば市販の鋼矢板用水膨脹性止水材が挙げられる。
Embodiments of the present invention will be described below using an example of a Larzen type joint. First, prior to placing the steel sheet pile, a leakage preventing material is applied to prevent the water-stopping material from leaking through the gaps of the Larsen
爪底部の凹溝４内の異物は注入用パイプの建て込み時の障害になるので事前に清掃除去しておく。また鋼矢板の移動あるいは打設時に凹溝４内に異物が浸入しないように、凹溝内には注入孔保護部材が取付けられる。
The foreign matter in the
次に鋼矢板を地中へ打設し、ラルゼン継手３の連接をしながらさらなる鋼矢板を打設する。打設終了後、注入孔保護部材は取り除かれる。
Next, a steel sheet pile is driven into the ground, and further steel sheet piles are driven while the Larsen
図３は鋼矢板の継手の止水方法の工程図を示す。図３（１）は鋼矢板の打設嵌合後、注入孔保護部材が除かれた状態を示す。鋼矢板の打設嵌合後、注入ポケット（爪底部の凹溝）を確認し、注入パイプの挿入に支障がある場合は、掃除用治具を注入ポケットに挿入して清掃、除去しておく。次に図３（２）に示されるように、注入ポケットに注入用パイプ６（本実施形態の場合、例えば外径φ８〜φ１２ｍｍ程度）を所定深度、例えば下端まで建て込む。次に図３（３）に示されるように、注入用パイプ６を注入ポンプ７に接続し、止水材を注入ポンプ７にて注入する。ここでは、注入用パイプ６を下から上に向かって一定速度で引き上げながら注入ポンプにより止水材を注入する。
FIG. 3: shows the process drawing of the water stop method of the steel sheet pile joint. FIG. 3 (1) shows a state where the injection hole protecting member is removed after the steel sheet pile is placed and fitted. After placing and fitting the steel sheet pile, check the injection pocket (the groove at the bottom of the nail), and if there is a problem in inserting the injection pipe, insert a cleaning jig into the injection pocket and clean it. . Next, as shown in FIG. 3B, the injection pipe 6 (in the case of the present embodiment, for example, an outer diameter of about φ8 to φ12 mm) is built into the injection pocket to a predetermined depth, for example, the lower end. Next, as shown in FIG. 3 (3), the
使用される止水材は、図１に示されるラルゼン継手３間の隙間ｄｘを満たせるように１０〜５５Ｐａ・ｓの粘性で、且つ水に溶けない性質（不溶性）をもつ。上述の漏洩防止材だけで完全に止水材の漏洩防止効果を期待することは難しいため、このような粘性が必要になる。例えば漏洩防止材に水膨脹性止水材を塗布し、海中で止水材の注入を行う場合、３０〜５０Ｐａ・ｓの粘性の止水材が望ましい。また周囲の水と直接接触した箇所が急激に硬化することで表面に膜をつくる性質を止水材に持たせることで、継手の隙間からの流出をより防止できる。止水材の主成分は特に限定されるものではないが、例えばシリコーンを好適に用いることができる。なおシリコーンを主成分とすると水膨潤性止水材ではないが、水膨潤性止水材を用いてもよい。
The water-stopping material used has a viscosity of 10 to 55 Pa · s so as to fill the gap dx between the
注入用パイプ６には、上記粘性の止水材を５０ｍ以下圧送可能な耐圧性を有するものが用いられる。上記粘性の止水材を例えば内径４ｍｍの管で２０ｍ圧送するためには１５〜２０ＭＰａ程度の圧力が必要である。この場合外径８ｍｍの合成繊維ブレードで補強した樹脂チューブが使用できる。止水材を送る注入ポンプ７にも止水材を５０ｍ以下圧送可能なものが用いられる。
As the
高粘性の止水材を空隙無く注入用ポケットに充填するためには、凹溝下端から順番に打ち上げてくる必要がある。このとき注入用パイプ６が残っていると隙間がほとんど無くなるため、漏洩防止材を押しのけて継手外に流出する。したがって予め止水材の突出速度を測定しておき、想定される注入ポケットの体積から注入パイプの引抜速度を計算し、注入用パイプ６の先端が止水材の上面付近に位置するようにコントロールする。
In order to fill the injection pocket with a high-viscosity water-stopping material without any gaps, it is necessary to launch it sequentially from the bottom of the groove. At this time, if the
止水材の充填が完了すると図３（４）で示される止水材充填完了になる。 When the filling of the water-stopping material is completed, the filling of the water-stopping material shown in FIG.
図４は、本発明の鋼矢板の継手の止水方法を適用した、廃棄物海面最終処分場の遮水鋼矢板壁の施工手順の一例を示す。まず海上に護岸を築造し、海を外洋と内海とに分離する護岸築造工を行う（Ｓ１）。 FIG. 4: shows an example of the construction procedure of the water-shielding steel sheet pile wall of the waste sea surface final disposal site to which the water stop method of the steel sheet pile joint of this invention is applied. First, a seawall is built on the sea, and a seawall is built to separate the sea into the open ocean and the inland sea (S1).
従来の遮水鋼矢板壁の施工手順では、この後、護岸の内側を埋めて、その後に鋼矢板を打設するのがルール化されていた。これは波による繰り返し荷重によって継手間のずれが生じ、鋼矢板に塗布した止水材が損傷を受けるからである。これに対して、本実施形態の施工手順では、波があるにも関わらず鋼矢板を打設する（Ｓ２）。この鋼矢板の打設工程は上述したとおりであるが、図５にも示されるように、漏洩防止用止水材塗布工程と、止水材養生工程と、鋼矢板打設工程と、注入孔保護部材挿入工程とを備える。 In the conventional construction procedure of the water-impervious steel sheet pile wall, after that, it was ruled to fill the inner side of the revetment and then place the steel sheet pile. This is because the joint between the joints is caused by the repeated load caused by the waves, and the water stop material applied to the steel sheet pile is damaged. On the other hand, in the construction procedure of this embodiment, a steel sheet pile is driven despite the presence of waves (S2). The steel sheet pile placing process is as described above. As shown in FIG. 5, as shown in FIG. 5, the leakage preventing water-stopping material applying process, the water-stopping material curing process, the steel sheet pile placing process, and the injection hole A protective member insertion step.
その後、護岸の裏込を行い、また鋼矢板の両側を埋め立てる（Ｓ３）。鋼矢板の両側を埋め立てた状態で鋼矢板の注入用ポケットに止水材を注入する（Ｓ４）。この注入工程は上述したとおりであるが、図６に示されるように、注入孔保護部材除去工程と、注入孔清掃工程と、注入用パイプ挿入工程と、止水材注入工程とを備える。止水材を注入後、廃棄物処分場が供用開始される（Ｓ５）。 Thereafter, the revetment is backed up and both sides of the steel sheet pile are reclaimed (S3). In a state where both sides of the steel sheet pile are reclaimed, a water stop material is injected into the injection pocket of the steel sheet pile (S4). Although this injection | pouring process is as above-mentioned, as FIG. 6 shows, it has an injection hole protection member removal process, an injection hole cleaning process, an injection pipe insertion process, and a water stop material injection | pouring process. After injecting the water blocking material, the waste disposal site is started in service (S5).
本実施形態のように、護岸の内側を埋め立てる前に鋼矢板を打設すると、鋼矢板の打設長を短くできるという利点がある。 If the steel sheet pile is placed before the inside of the revetment is reclaimed as in the present embodiment, there is an advantage that the steel sheet pile placement length can be shortened.
なお上記実施形態では、ラルゼン継手を有する鋼矢板を用いた例で説明したが、本発明では、ラルゼン継手を有する鋼矢板に限られることなく、図７に示される直線型継手を有する鋼矢板を用いてもよい。この場合直線型継手の爪底部の内面にはやはり凹溝４が形成される。
In addition, in the said embodiment, although demonstrated with the example using the steel sheet pile which has a Larzen joint, in this invention, the steel sheet pile which has a linear joint shown by FIG. 7 is not restricted to the steel sheet pile which has a Larsen joint. It may be used. In this case, the
〈実施例１〉
遮水鋼矢板４ｍ×５枚を用いて性能確認試験を実施した。凹溝内に注入パイプ（外径φ９ｍｍ、内径φ４ｍｍ）を所定深さまで挿入した。止水材は５０Ｐａ・ｓの高粘度流動性のシリコーンを用い、高圧ポンプ（エアポンプ）により注入を継続しながら注入パイプを引き抜いた。注入を、深度下端から上方に向かって引抜き注入の形態とした。止水材養生後に遮水性能を確認するための水槽試験を実施した結果、滲む程度のわずかな漏水しか見られず、従来以上の性能が確認された。
<Example 1>
A performance confirmation test was carried out using 4 m × 5 sheets of water shielding sheet piles. An injection pipe (
〈実施例２〉
内径が１０ｍｍの凹溝を持つ４Ａ型相当で全長１８ｍの鋼矢板に止水処理を施した。止水処理の対象は鋼矢板壁天端から海底面までの１３ｍの間である。鋼矢板の継手の一部には止水材料漏洩防止用として、市販の水膨潤性止水材をあらかじめ塗布した。なお潮位より上の部分は止水材が膨潤しないため、鋼矢板打設後に継手外側からパテを塗布した。
<Example 2>
A steel sheet pile having a total length of 18 m and having a concave groove with an inner diameter of 10 mm was subjected to a water stop treatment. The target of the water stop treatment is between 13 m from the top of the steel sheet pile wall to the bottom of the sea. A commercially available water-swellable water-stopping material was applied in advance to a part of the joint of the steel sheet pile to prevent leakage of the water-stopping material. In addition, since the water stop material did not swell in the part above the tide level, the putty was applied from the outside of the joint after the steel sheet pile was cast.
止水材としては、粘性が４０Ｐａ・ｓのシリコーン主成分のものを用いた。このシリコーンからなる止水材は周囲の水分と反応して急速に硬化する性質がある。ただし表面で硬化した部分が水の浸透を制限するため内部が硬化するまでにはしばらく時間がかかるため、十分に継手内の隅々に行き渡ることができた。 As the waterstop material, a silicone main component having a viscosity of 40 Pa · s was used. This silicone water-stopping material has the property of reacting with surrounding moisture and rapidly curing. However, since the hardened portion on the surface restricts the penetration of water, it takes a while for the inside to harden, so that it was possible to spread all over the joint.
注入パイプとしての耐圧チューブは、内径が３．６ｍｍ、外径が８．３ｍｍ、ナイロンコアチューブを合成繊維ブレードで補強しポリウレタンで外側をカバーしており、２０ＭＰａの圧力まで耐えられる。最小曲げ半径が１５ｍｍと引抜時にも扱いやすい。このチューブを鋼矢板天端より海底面まで差込み、一定速度で引き上げながら高圧ポンプを使用して１５ＭＰａの圧力でシリコーンを注入した。 The pressure-resistant tube as an injection pipe has an inner diameter of 3.6 mm, an outer diameter of 8.3 mm, a nylon core tube is reinforced with a synthetic fiber blade and the outer side is covered with polyurethane, and can withstand a pressure of 20 MPa. The minimum bend radius is 15mm, so it is easy to handle when pulling out. The tube was inserted from the top of the steel sheet pile to the bottom of the sea, and silicone was injected at a pressure of 15 MPa using a high-pressure pump while pulling up at a constant speed.
止水材の硬化を待って、止水処理を施した鋼矢板で囲まれる部分へ海水を注入したところ水位の低下は見られず、継手からの漏水が無いことが確認された。 Waiting for the water-stopping material to harden and injecting seawater into the part surrounded by the steel sheet pile subjected to water-stopping treatment, it was confirmed that there was no water level drop and no water leakage from the joint.
〈実施例３〉
この実施例３では、爪底部の凹溝（充填ポケット）に事前に水膨潤性の止水ゴムを装着し鋼矢板を打設した場合と、鋼矢板打設後に充填ポケットから止水材を注入した場合とについて、水槽を用いて鋼矢板の漏水量を測定し、遮水性能を評価した。実験は、図８に示す幅２．０ｍ×長さ３．６ｍ×高さ３．３ｍの水槽中央部に鋼矢板を設置し、処分場側と外海側で水位差をつけ、鋼矢板の透水試験を行った。実験に使用した鋼矢板および充填ポケットに用いた止水ゴム、止水材の規格・特性を表１に示す。
<Example 3>
In this Example 3, a water-swellable water stop rubber was previously installed in the groove (filling pocket) at the bottom of the nail and a steel sheet pile was placed, and a water stop material was injected from the filling pocket after the steel sheet pile was placed. About the case where it did, the amount of water leakage of the steel sheet pile was measured using the water tank, and the water shielding performance was evaluated. In the experiment, a steel sheet pile was installed in the center of the water tank of 2.0m wide x 3.6m long x 3.3m high as shown in Fig. 8, and the water level difference between the disposal site side and the open sea side. A test was conducted. Table 1 shows the specifications and characteristics of the water-stopping rubber and water-stopping material used for the steel sheet piles and filling pockets used in the experiment.
止水材については、水中で分離しにくく、かつ変形追随性および耐久性を考慮し高粘度流動性のシリコーンを採用した。シリコーンの注入は継手嵌合後に充填ポケットからφ９ｍｍの注入管を挿入し、エアポンプを用いて下から上に引き上げ圧送した。透水試験は表２に示すように充填ポケットに事前に止水ゴムを装着し鋼矢板を嵌合させた場合と、嵌合後に止水材を注入する場合と、片側に事前に止水ゴムを装着し、打設後に片側から止水材を注入する場合の３ケース行った。 As the water-stopping material, silicone having high viscosity and fluidity was adopted in consideration of deformation followability and durability. Silicone was injected by inserting a φ9 mm injection tube from the filling pocket after fitting the joint, and using an air pump, the pipe was pulled up from the bottom and pumped. As shown in Table 2, the water permeability test includes a case where a water stop rubber is fitted in the filling pocket in advance and the steel sheet pile is fitted, a case where a water stop material is injected after the fitting, and a water stop rubber is applied in advance to one side. Three cases were carried out when the water-stopping material was injected from one side after mounting and placing.
透水試験は遮水工を施した後に処分場側の水位を一定とし、鋼矢板継手からの透水した水を外海側にて測定した。測定は遮水工実施後(養生期間:止水ゴム１４日、シリコーン４日)の静水圧状態で２４時間おこなった後に、再度外海側に注水し鋼矢板を油圧ジャッキにて２４時間加振(載荷点変位±２５ｍｍ、周期５ｓｅｃ)し、再び２４時間の計測を実施した。 In the water permeability test, the water level on the disposal site side was made constant after the impermeable work, and the water permeated from the steel sheet pile joint was measured on the open sea side. Measurements were made for 24 hours under hydrostatic conditions after the impervious work (curing period: 14 days for static rubber, 4 days for silicone), and then water was poured into the open sea again, and the steel sheet pile was vibrated with a hydraulic jack for 24 hours ( The loading point displacement was ± 25 mm, the cycle was 5 sec), and the measurement was again performed for 24 hours.
透水試験の結果を表３に示す。 Table 3 shows the results of the water permeability test.
透水試験によって得られた結果より、ダルシー則(式１)を用いて、鋼矢板の換算透水係数を求めた。ここで、透水長Lは鋼矢板の壁厚を５０ｃｍ(透水層厚５０ｃｍに換算)と仮定した。表４に換算透水係数を示す。 From the results obtained by the permeability test, the converted permeability coefficient of the steel sheet pile was obtained using Darcy's law (Formula 1). Here, the water permeation length L assumed that the wall thickness of the steel sheet pile was 50 cm (converted to a water permeation layer thickness of 50 cm). Table 4 shows the converted hydraulic conductivity.
q=A・k'・△h/L・・(式１)
q:単位時間あたりの透水量(ｃｍ3／ｓ)、A:透水断面積(ｃｍ2)［鋼矢板延長４０ｃｍ×４＝１６０ｃｍに高さ(処分場側と外海側の平均水位)を乗じたもの］
k':換算透水係数（ｃｍ／ｓ）
△h:水位差（ｃｍ）
L:透水長（ｃｍ）［L＝５０ｃｍと仮定］
q = A ・ k '・ △ h / L ・ ・ (Formula 1)
q: Permeable amount per unit time (cm 3 / s), A: Permeable cross section (cm 2 ) [Steel
k ': Converted hydraulic conductivity (cm / s)
△ h: Water level difference (cm)
L: Permeable length (cm) [Assuming L = 50 cm]
Case１，２，３(止水材注入後)ともに加振前よりも加振後のほうが、換算透水係数が大きくなる傾向となった。ただし、Case１については、継手に僅に滲みが観察される程度なため、定量的な比較は行えなかった。Case１の止水ゴムに関して、養生１週間経過後では漏水が見られたが、２週間後の計測では継手間の漏水は見られず滲む程度であった。Case２においては注入時に継手嵌合部の隙間から止水材が一部漏れるものの、止水材自身の硬化により隙間が塞がれていく現象が見られた。Case３については、片側止水ゴムの状態では、継手の嵌合状況により漏水が生じるが、止水材を注入することにより漏水はほぼ０となった。
In
止水ゴムの膨潤状態および止水材の状況を確認するために、試験終了後に試験体を切断した。止水ゴムが膨潤し継手に圧着しており、ゴムの継手への接面応力によるシール効果が発揮されていることがわかった。止水材についても隙間部にほぼ充填されており、みず道を遮断していると考えられる。 In order to confirm the swelling state of the water-stopping rubber and the state of the water-stopping material, the test body was cut after the test. It was found that the water-stopping rubber swelled and was pressure-bonded to the joint, and the sealing effect due to the contact stress of the rubber to the joint was exhibited. It is considered that the water-stopping material is almost filled in the gaps, blocking the waterway.
３…ラルゼン継手（継手）
４…凹溝
６…注入用パイプ
７…ポンプ
3 ... Ralsen fitting (Fitting)
4 ...
Claims (3)
前記爪底部の前記凹溝に前記止水材を注入するための注入用パイプを挿入し、
その後、前記注入用パイプの先端が前記止水材の上面付近に位置するように、前記注入用パイプを引き上げながら前記止水材を注入することを特徴とする鋼矢板の継手の止水方法。 In cross-sectional view, after placing and fitting a steel sheet pile in which a concave groove filled with a water stop material is formed on the inner surface side of the nail bottom of the joint,
Insert an injection pipe for injecting the water stop material into the concave groove of the nail bottom,
After that, the water stop material is injected while pulling up the injection pipe so that the tip of the injection pipe is positioned in the vicinity of the upper surface of the water stop material.
前記爪底部の前記凹溝に、粘性が３０〜５０Ｐａ・ｓの止水材を注入することを特徴とする鋼矢板の継手の止水方法。 In cross-sectional view, after placing and fitting a steel sheet pile in which a concave groove filled with a water stop material is formed on the inner surface side of the nail bottom of the joint,
A water-stopping method for a steel sheet pile joint, wherein a water-stopping material having a viscosity of 30 to 50 Pa · s is injected into the groove at the bottom of the claw.
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