JP2014122520A - Soil cement clipping method in earth-retaining method - Google Patents
Soil cement clipping method in earth-retaining method Download PDFInfo
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本発明は、地盤を掘削する際に、周囲の地盤の崩壊を防ぐために適用される山留め及びその工法に関し、さらに詳しくは、山留め施工前に芯材に粘着テープを貼り付けておき、ソイルセメント斫り時の作業効率を大幅に向上させ、芯材をガス切断し再接合する場合にも芯材の接合面がきれいでケレンの手間を削減することが可能な工法に関するものである。
また、本発明でいうソイルセメントとは土、セメント及び水を混合して固めた混合物をいう。
さらに、芯材とは鉄骨、鉄板、鉄筋等の山留め工事で用いられる芯材であり、本発明では特にＨ鋼を芯材とする。
The present invention relates to a retaining ring and its construction method that are applied to prevent the surrounding ground from collapsing when excavating the ground, and more specifically, an adhesive tape is attached to a core material before the retaining work, The present invention relates to a construction method that can greatly improve the working efficiency at the time of cutting, and can reduce the labor of keren with a clean joint surface of the core material even when the core material is gas-cut and re-joined.
Moreover, the soil cement as used in the field of this invention means the mixture which hardened by mixing soil, cement, and water.
Furthermore, the core material is a core material used in mountain fixing work such as a steel frame, an iron plate, and a reinforcing bar, and in the present invention, H steel is particularly used as the core material.
山留め施工には、その用途や形状は多岐に渡り、特に、土や水を遮るための山留壁の選択は非常に重要な意味をなしており、水は存在するのかしないのか、地盤は軟弱なのか硬いのか等によりその工法も様々ある。建設で地下を深く掘削する際、ＳＭＷ連続壁などが用いられる。ＳＭＷとは土（Ｓｏｉｌ）とセメントスラリーを原位置で混合・攪拌（Ｍｉｘｉｎｇ)し、地中に造成する壁体（Ｗａｌｌ)の略称である。土とセメントスラリーを原位置で混合・撹拌し、地中に造成される連続壁体であるが、掘削時の片土圧に抵抗するため、通常その中に芯材が組み込まれている。 There are a wide variety of uses and shapes for mountain-clamping construction, and in particular, the selection of a mountain retaining wall to block soil and water makes a very important meaning, whether water is present or not, and the ground is soft There are various methods depending on whether it is hard or hard. When excavating deep underground in construction, SMW continuous walls are used. SMW is an abbreviation for a wall (Wall) that is created in the ground by mixing and stirring soil and cement slurry in situ. It is a continuous wall that is created by mixing and stirring soil and cement slurry in-situ and built in the ground. However, in order to resist the earth pressure during excavation, a core material is usually incorporated in it.
道路などの土木工事では、最終的に芯材が存置されるとガス・水道などのインフラ配管施工の障害になるため、地下深度１．５〜３．０ｍの位置で芯材を切断し抜き取る必要がある。
切土で自立していることが前提であるが、地下深度１．５ｍで切断する場合には地下浅いため、ソイルセメントを斫った後芯材を切断し撤去することが可能である。但し、その際芯材が平面的に連続しており、斫り作業を横向きで行うため、芯材間のソイルセメントを斫る作業性は悪く、手間がかかる。芯材間が狭い場合は、その手間が増大する。また、硬化したソイルセメントを砕る作業時には大きな騒音と振動が発生する。
In civil engineering works such as roads, if the core material is finally left, it becomes an obstacle to the construction of infrastructure pipes such as gas and water. Therefore, it is necessary to cut and extract the core material at a depth of 1.5 to 3.0 m. There is.
Although it is premised that it is self-supporting by cutting, since it is shallow underground when cutting at a depth of 1.5 m, it is possible to cut and remove the core material after grinding soil cement. However, in this case, the core material is continuous in a plane, and the winding operation is performed in the horizontal direction, so that the workability of winding the soil cement between the core materials is poor and troublesome. When the space between the core materials is narrow, the labor is increased. Also, loud noise and vibration are generated during the operation of crushing the cured soil cement.
地下深くで芯材を切断する場合は、上記のように芯材を取り除くことは不可能なので、通常地下施工途中にソイルセメントを砕り、芯材のフランジ・ウエブをガス切断し、チャンネル鋼材とボルトで再接合するなどの処置を施したうえで、地下工事完了後に芯材を抜き取るのが一般的である。
但し、その際以下の問題が生じる。
When cutting the core material deep underground, it is impossible to remove the core material as described above. Usually, soil cement is crushed during underground construction, the core flange and web are gas cut, and the channel steel material is removed. It is common to remove the core material after the completion of underground work after taking measures such as rejoining with bolts.
However, the following problems occur at that time.
再接合するためにソイルセメントを１ｍ程斫る必要があり、上記の場合と同様作業性が悪く手間がかかる。 In order to re-join, it is necessary to grind the soil cement by about 1 m, and the workability is poor and troublesome as in the case described above.
また、斫った後には芯材にソイルセメントが付着しており、再接合のためには接合面をケレンするなどの処置が必要であり、手間がかかる。 In addition, soil cement adheres to the core material after squeezing, and it is necessary to take measures such as cleansing the joint surface for rejoining.
既出のアイデアは、以下のとおりである。
芯材に硬質のプラスチックカバーをかぶせておく。これは、かぶせる手間に加え、コストアップになる。（特許文献１）
芯材に切欠き部分をつくる。これは芯材の加工が発生し、大幅なコストアップ。コンクリート除去の手間は従来と変わらない。（特許文献２）
芯材に剥離剤を塗っておく。これは、十分に機能しない。（特許文献３、特許文献４）
芯材に粘着テープや粘着フィルムを貼る。これは、本件発明と目的は同じであるが、防水性のテープであり、テープを除去した後の芯材が汚れているため、ケレンの手間が発生する。（特許文献５）
The previous ideas are as follows.
Cover the core with a hard plastic cover. This adds cost and increases costs. (Patent Document 1)
Make a notch in the core. This is a significant cost increase due to the processing of the core material. The effort to remove concrete is the same as before. (Patent Document 2)
Apply a release agent to the core. This does not work well. (
Adhere adhesive tape or adhesive film to the core. This is the same object as the present invention, but is a waterproof tape, and the core material after the tape is removed is dirty, so that the labor of keren is generated. (Patent Document 5)
本発明は、芯材を用いる山留め工法、代表的にはＳＭＷ工法において、山留め施工前に、芯材の表面を特殊な粘着テープを貼り付けて覆うことにより、ソイルセメント斫り（ハツリ）時の作業効率を大幅に向上させ、芯材をガス切断し再接合する場合にもＨ鋼芯材の接合面がきれいでケレンの手間を削減することが可能な工法に関するものである。
The present invention relates to a method of fastening with a soil cement by covering a surface of the core material with a special adhesive tape before the mounting of the mountain in the mountain fastening method using the core material, typically the SMW method. The present invention relates to a construction method that can greatly improve the working efficiency and can reduce the labor of keren because the joining surface of the H steel core material is clean even when the core material is gas cut and rejoined.
本発明者は、前記課題を解決すべく、鋭意研究を続けた結果、本発明に到達した。すなわち、本発明は、山留め施工前に、芯材の所定個所に、水分で溶解もしくは膨潤する粘着剤層を有する粘着テープを貼り付けて、予め芯材の表面を覆うことにより、芯材を保護しながらソイルセメント内に埋め込んで山留め工事を行い、工事後に、ソイルセメントの塊を芯材から粘着テープと共に除去することを特徴とするソイルセメント斫り方法である。
また、本発明のソイルセメント斫り方法は、山留め工法としてＳＭＷ工法が好適である。
さらに、本発明は、工事後に、ソイルセメントの塊を芯材から除去するに際し、粘着テープが芯材の表面から剥がれており、粘着テープを貼り付けていた芯材の面が、清浄に保たれることを特徴とする 。
また、本発明は、本発明のソイルセメント斫り方法に用いる粘着テープであって、剥離剤層、基材、粘着剤層からなり、粘着剤層に用いる粘着剤は、ＪＩＳ Ｚ０２３７に準じた粘着力が１．５Ｎ／１０ｍｍ以上で、粘着剤が水に溶解性であるか、または水で膨潤する粘着剤であって、ソイルセメントが含有する水分で粘着剤が溶ける、または膨潤して、芯材の面から容易にテープが剥離する粘着テープである。
さらに、本発明のソイルセメント斫り方法に用いる粘着テープは、基材が透湿性を有する和紙やクレープ紙、または不織布であり、粘着剤が水溶性若しくは水膨潤性アクリル系共重合体であるソイルセメント斫り用粘着テープとすることができる。
The inventor of the present invention has arrived at the present invention as a result of continual research to solve the above-mentioned problems. That is, the present invention protects the core material by attaching an adhesive tape having an adhesive layer that dissolves or swells with moisture to a predetermined location of the core material before covering the core material, and covers the surface of the core material in advance. The soil cement grinding method is characterized in that the soil cement is buried in the soil cement and is piled, and after the construction, the lump of the soil cement is removed together with the adhesive tape from the core material.
In addition, the soil cement grinding method of the present invention is preferably the SMW method as the mountain retaining method.
Furthermore, in the present invention, when the lump of soil cement is removed from the core material after the construction, the adhesive tape is peeled off from the surface of the core material, and the surface of the core material to which the adhesive tape is attached is kept clean. It is characterized by that.
Further, the present invention is an adhesive tape used for the soil cement grinding method of the present invention, comprising a release agent layer, a base material, and an adhesive layer. The adhesive used for the adhesive layer is an adhesive according to JIS Z0237. The pressure is 1.5 N / 10 mm or more, and the pressure-sensitive adhesive is soluble in water or swells in water, and the pressure-sensitive adhesive dissolves or swells in the water contained in the soil cement. It is an adhesive tape that can be easily peeled off from the surface of the material.
Furthermore, the pressure-sensitive adhesive tape used in the soil cement grinding method of the present invention is a soil in which the base material is Japanese paper, crepe paper, or nonwoven fabric having moisture permeability, and the pressure-sensitive adhesive is a water-soluble or water-swellable acrylic copolymer. It can be used as an adhesive tape for cement.
本発明により、容易にソイルセメントの塊を芯材から除去することが可能であり、また粘着テープを貼り付けていた面は粉砕されたソイルセメントの欠片や汚れもない。芯材切断部分を再溶接する場合、粘着テープの粘着剤が水で溶解または膨潤して、テープが芯材から離脱しているため、粘着剤が芯材に付着しておらず、同時に芯材をテープ基材が被覆しているために、再接合面がきれいな状態となっているため、ケレンの作業時間も短縮でき、総じて工事作業時間及び労力を大幅に削減することができる。同時に作業中に発生する騒音や振動を大幅に軽減することができる。
According to the present invention, a lump of soil cement can be easily removed from the core material, and the surface on which the adhesive tape has been applied is free from crushed soil cement fragments and dirt. When re-welding the core cut part, the adhesive of the adhesive tape is dissolved or swollen with water and the tape is detached from the core, so that the adhesive is not attached to the core, and at the same time the core Since the tape base material coats the surface, the rejoined surface is in a clean state, so that the work time for keren can be shortened, and overall the work time and labor can be greatly reduced. At the same time, noise and vibration generated during work can be greatly reduced.
山留め施工前に、基材としては和紙やクレープ紙や生分解性のプラスチック若しくは通常のプラスチックであり、とくに不織布が好ましい。本発明は、粘着剤が、固まる前のソイルセメントの水分で溶ける、もしくは水で膨潤して接着性が低下するものであり、この粘着テープを芯材貼り付けることにより、ソイルセメントを斫る際には、粘着テープの粘着剤は水に溶解もしくは水で膨潤して接着力が低下しており、容易にソイルセメントの塊を芯材から除去することを可能とし、また、粘着テープを貼り付けていた面は粉砕されたソイルセメントの欠片や汚れもなく、ケレンの作業も短縮でき、総じて工事作業時間及び労力を大幅に削減することが可能であることが判明した。
また、ソイルセメントを斫る作業時間が短縮したことにより、騒音や振動を発生する時間を大幅に削減することができた。
本発明では、粘着テープは基材が和紙やクレープ紙や生分解性のプラスチック若しくは通常のプラスチックであり、とくに不織布が好ましい。粘着剤が、固まる前のソイルセメントの水分で溶解もしくは膨潤して接着力が低下しており、芯材から容易に剥離するものである。
粘着剤はしっかりと芯材の表面に貼り付けると強接着性を発現するが、タック及び初期接着が弱く、貼り直しが効くものである。ただし、芯材への貼り付け作業後からＨ鋼芯材の埋め込み作業までの雨天など短時間の状況下では粘着剤が溶解または膨潤してはならない。また錆びついた芯材の凹凸にも十分に追従するよう、粘着剤の厚みは３０〜２００μｍである。
基材は、１００ｍｍ〜３００ｍｍ幅のシートをロール状に巻いたテープから巻き出し、適当な長さにカットする必要があるために、カット性に優れる直交性のある繊維配向を有するものであり、好ましくは縦横比４：１以下である。
本発明の粘着テープの粘着剤には水溶性粘着剤を用いる。本件発明に適した粘着剤としては、水溶性粘着剤または水分解性粘着剤、水膨潤性粘着剤としては、例えばサイデン化学株式会社製サイビノールＡＴ−７００（水溶性アクリル系共重合体）、株式会社クラレ製ＰＶＡ−１１７等が挙げられるが、芯材は、鏡面ではなく、錆が発生する等微小な凹凸があるため、貼り付け時には追従性が重要であることから、柔軟な粘着剤である水溶性アクリル系共重合体が好適であり、さらには芯材への貼り付け作業後から芯材の埋め込み作業までの雨天など短時間の状況下では粘着剤が分解しないように、架橋剤を添加した水溶性アクリル系共重合体が好適に用いられる。架橋剤の添加量が少なすぎる場合は、短期間での雨天曝露にて粘着剤が溶解または膨潤し、芯材の埋め込み作業時に粘着シートが浮いたり、剥がれたりして、好ましくない。また架橋剤の添加量が過剰になると、粘着剤の初期接着性及び粘着力が不足し、芯材の埋め込み作業時に粘着シートが浮いたり、剥がれたりし、またソイルセメント内に含まれる水分で粘着剤が溶解または膨潤せず、好ましくない。
Prior to the installation, the base material is Japanese paper, crepe paper, biodegradable plastic or ordinary plastic, and nonwoven fabric is particularly preferable. The present invention is one in which the adhesive dissolves with the moisture of the soil cement before it hardens, or swells with water, resulting in a decrease in adhesiveness. The adhesive of the adhesive tape is dissolved in water or swollen with water and the adhesive strength is reduced, making it possible to easily remove the soil cement lump from the core material, and stick the adhesive tape It was found that the ground surface was free of crushed soil cement fragments and dirt, and the work of keren could be shortened, and overall the construction work time and labor could be greatly reduced.
In addition, the time for generating soil cement was shortened, so the time for generating noise and vibration could be greatly reduced.
In the present invention, the base material of the adhesive tape is Japanese paper, crepe paper, biodegradable plastic, or ordinary plastic, and non-woven fabric is particularly preferable. The adhesive is dissolved or swollen by the moisture of the soil cement before it hardens, and the adhesive strength is reduced, and it is easily peeled off from the core material.
The pressure-sensitive adhesive exhibits strong adhesiveness when firmly attached to the surface of the core material, but is weak in tack and initial adhesion, and can be re-applied. However, the adhesive should not dissolve or swell under short-term conditions such as rain from the pasting operation to the core material to the embedding operation of the H steel core material. The thickness of the pressure-sensitive adhesive is 30 to 200 μm so as to sufficiently follow the unevenness of the rusty core material.
Since the base material needs to be unwound from a tape in which a sheet having a width of 100 mm to 300 mm is wound in a roll shape and cut to an appropriate length, the base material has an orthogonal fiber orientation excellent in cut property, The aspect ratio is preferably 4: 1 or less.
A water-soluble adhesive is used for the adhesive of the adhesive tape of the present invention. Examples of the pressure-sensitive adhesive suitable for the present invention include a water-soluble pressure-sensitive adhesive or a water-decomposable pressure-sensitive adhesive, and examples of the water-swellable pressure-sensitive adhesive include Cybinol AT-700 (water-soluble acrylic copolymer) manufactured by Seiden Chemical Co., Ltd. PVA-117 manufactured by Kuraray Co., Ltd. can be mentioned, but the core material is not a mirror surface, but has minute irregularities such as rust, so that followability is important at the time of pasting, so it is a flexible adhesive. A water-soluble acrylic copolymer is suitable, and a cross-linking agent is added to prevent the adhesive from decomposing under short-term conditions such as raining from pasting to core material to embedding core material. The water-soluble acrylic copolymer used is preferably used. When the addition amount of the crosslinking agent is too small, the pressure-sensitive adhesive dissolves or swells when exposed to rain in a short period of time, and the pressure-sensitive adhesive sheet floats or peels off when the core material is embedded, which is not preferable. If the amount of cross-linking agent added is excessive, the initial adhesiveness and adhesive strength of the adhesive will be insufficient, the adhesive sheet will float or peel off during the core material embedding operation, and the moisture contained in the soil cement will cause adhesion. The agent does not dissolve or swell, which is not preferable.
テープ基材は和紙やクレープ紙や生分解性のプラスチックフィルム若しくは通常のプラスチックフィルムであり、とくに不織布が好ましい。不織布としては、ポリエステル系不織布、レーヨン系不織布、ポリオレフィン系不織布を挙げることが出来る。厚みは２５〜３００μｍの範囲で選択され、好ましくは７５〜２５０μｍの範囲で選択される。 The tape base material is Japanese paper, crepe paper, biodegradable plastic film or ordinary plastic film, and nonwoven fabric is particularly preferable. Examples of the nonwoven fabric include polyester nonwoven fabric, rayon nonwoven fabric, and polyolefin nonwoven fabric. The thickness is selected in the range of 25 to 300 μm, preferably in the range of 75 to 250 μm.
テープ基材は透湿性のあるものが好ましい。フラットヤーン等透湿性の低いフィルム基材では、粘着シート側面からしか水が浸入できず、粘着剤の溶解または膨潤に時間を要するため、テープ基材に透湿性のある不織布がより好適である。 The tape base material is preferably moisture permeable. In a film substrate having low moisture permeability such as flat yarn, water can only enter from the side of the pressure-sensitive adhesive sheet, and it takes time to dissolve or swell the pressure-sensitive adhesive. Therefore, a non-woven fabric having moisture permeability in the tape substrate is more suitable.
粘着剤層の厚みは基材厚の２０〜２００％の範囲で選択され、好ましくは３０〜２００μｍの範囲で選択される。 The thickness of the pressure-sensitive adhesive layer is selected in the range of 20 to 200% of the substrate thickness, and preferably in the range of 30 to 200 μm.
粘着テープの粘着力は１．５Ｎ／１０ｍｍ以上であり、好ましくは２．０Ｎ／１０ｍｍ〜１０．０Ｎ／１０ｍｍの範囲で選択され、さらに好ましくは３．０Ｎ〜８．０Ｎ／１０ｍｍの範囲で選択される。
なお、ここでいう粘着力はＪＩＳ Ｚ０２３７に準じて測定され、具体的にはＪＩＳ Ｇ ４３０５に規定する厚さ２ｍｍ以上、幅約５０ｍｍ、長さ約１２５ｍｍのＳＵＳ３０４鋼板で、鏡面仕上げのもの又は耐水研磨紙で磨いたものを試験板として用い、温度２３±２℃、相対湿度（５０±５）％の雰囲気中で、幅２５ｍｍ、長さ２５０ｍｍの試験片を貼り付け、ＪＩＳ Ｋ６２５３に規定するスプリング硬さ８０±５Ｈｓ、厚さ約６ｍｍのゴム層で被覆された、幅約４５ｍｍ、ゴム層を含む直径が約９５ｍｍ、質量２，０００±５０ｇのローラの自動式圧着装置を用いて、速度約５ｍｍ／ｓ、１往復で圧着したものを、１８０度、速度約３００ｍｍ／ｓで引き剥がして得られる荷重である。
The adhesive strength of the adhesive tape is 1.5 N / 10 mm or more, preferably selected in the range of 2.0 N / 10 mm to 10.0 N / 10 mm, more preferably selected in the range of 3.0 N to 8.0 N / 10 mm. Is done.
The adhesive strength here is measured according to JIS Z0237. Specifically, it is a SUS304 steel plate having a thickness of 2 mm or more, a width of about 50 mm, and a length of about 125 mm as defined in JIS G 4305. Using spring-polished paper as a test plate, a test piece with a width of 25 mm and a length of 250 mm is pasted in an atmosphere of a temperature of 23 ± 2 ° C. and a relative humidity (50 ± 5)%, and a spring specified in JIS K6253 Using an automatic crimping device of a roller having a hardness of about 45 mm, a diameter of about 95 mm including the rubber layer, and a mass of 2,000 ± 50 g, coated with a rubber layer having a hardness of 80 ± 5 Hs and a thickness of about 6 mm, a speed of about This is a load obtained by peeling a piece that has been pressure-bonded at 5 mm / s and 1 reciprocation at 180 degrees and at a speed of about 300 mm / s.
粘着剤層厚は厚い方が被着体（Ｈ鋼芯材）への追従性は良好であるが、テープ側面からの粘着剤のはみ出しが酷くなり、テープ外観や作業性に問題が発生する。
本発明のソイルセメント斫り方法で用いられる粘着テープの構造は、剥離剤層、基材、粘着剤層からなり、基材に粘着剤を塗布して粘着剤層とし、粘着剤を塗布した基材の反対側面には、剥離剤が塗布されて剥離剤層が形成される。このようにすることにより、長い粘着テープを巻回しても、剥離剤層が粘着剤層面を覆うことになり、容易に巻きほぐすことができる。
The thicker the pressure-sensitive adhesive layer, the better the followability to the adherend (H steel core material), but the pressure-sensitive adhesive sticks out from the side of the tape, causing problems in the appearance and workability of the tape.
The structure of the pressure-sensitive adhesive tape used in the soil cement grinding method of the present invention is composed of a release agent layer, a base material, and a pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer is applied to the base material to form a pressure-sensitive adhesive layer. On the opposite side of the material, a release agent is applied to form a release agent layer. By doing in this way, even if it winds a long adhesive tape, a release agent layer will cover an adhesive layer surface, and it can unwind easily.
（基材の調整）
ＪＸ日鉱日石エネルギー ミライフ（ポリエステル系不織布）を原反として使用し、アクリル樹脂を含浸処理して基材ａを得た。
（粘着剤の調整）
サイデン化学ＡＴ−７００に架橋剤として旭化成ケミカルズ イソシアネート系架橋剤を１．０質量部添加し、十分に攪拌した粘着剤ａを得た。
（粘着テープの製造）
基材ａに乾燥後の厚みが１５０μｍになるように粘着剤ａを塗布し、さらに粘着剤を塗工した面の反対の面に長鎖アルキル系剥離剤を乾燥後の塗布量０．５ｇ／ｍ２になるように塗布し、乾燥後巻取り、粘着テープａを得た。
得られた粘着テープについて、接着性、巻き出し性、耐水保持力、水剥離性を評価した。
粘着力：ＪＩＳ Ｚ０２３７に準じてＳＵＳ板に対する粘着力を測定した。
巻き出し性：テープを巻き出す際に、テープが破れることなく、また粘着剤がテープ背面に転写することなく、スムーズに引き出せるかを確認した。
耐水保持力：被着体（Ｈ鋼芯材）に貼り付け、１週間屋外曝露して、浮き、剥がれがないことを目視で確認した。
水剥離性：ＳＵＳ板に貼り付け、１週間浸水して、テープの粘着剤が溶解または膨潤して接着力を低下させることにより、被着体（ＳＵＳ板）からテープが剥離し、テープが浮いてくることを目視で確認した。
実用試験１：
ＪＸ日鉱日石エネルギー ミライフにアクリル樹脂を含浸処理した基材ａに、サイデン化学株式会社製サイビノールＡＴ−７００／イソシアネート系架橋剤＝１００／１の粘着剤を乾燥後のテープの厚みが１５０μｍになるように塗布し、さらに粘着剤を塗工した面の反対の面に長鎖アルキル系剥離剤を塗布し、乾燥後巻取り、粘着テープａを得た。
テープ幅１００ｍｍ×長さ２００ｍｍのシートを作成し、Ｈ鋼に貼り付け、作業性を評価した。
○・・・初期接着性が弱く、貼り直しが効き、作業性良好。Ｈ鋼への追従性良好。
△・・・初期接着性が弱く、貼り直しが効くが、Ｈ鋼への追従性が不十分で強く押し付けると固定できる。
×・・・初期接着性が弱く、被着体への追従性も悪く、浮きが多くみられる。
実用試験２：
実用試験１で固定した状態で、１週間屋外曝露し、状態を観察した。
○・・・浮き、剥がれがない。
△・・・部分的に浮き、または剥がれが発生している。
×・・・浮き、剥がれが多く見られる。
実用試験３：
３００ｍｍ×３００ｍｍ×３００ｍｍの段ボールを地中に設置し、段ボール箱内に実用試験１で固定した状態でＨ鋼を設置し、段ボール箱内にセメントを流し込み、１週間後に硬化したセメントの塊にクラックを入れ、セメントを斫る。取り出したＨ鋼から付着したセメントを除去し、その際の作業性及びシートを除去した後のＨ鋼の表面状態を観察した。
○・・・Ｈ鋼付近のセメントが容易に斫ることができ、Ｈ鋼の表面がきれいである。
△・・・Ｈ鋼付近のセメントが容易に斫ることができるが、Ｈ鋼の表面が汚れている。
×・・・Ｈ鋼付近のセメントを斫るのに困難を要する。またＨ鋼の表面が汚れている。
(Adjustment of base material)
The base material a was obtained by impregnating the acrylic resin using JX Nippon Oil & Energy Corporation Milife (polyester nonwoven fabric) as a raw material.
(Adhesive adjustment)
1.0 part by mass of Asahi Kasei Chemicals isocyanate-based crosslinking agent as a crosslinking agent was added to Sidden Chemical AT-700 to obtain a sufficiently stirred pressure-sensitive adhesive a.
(Manufacture of adhesive tape)
The adhesive a was applied to the substrate a so that the thickness after drying was 150 μm, and the coating amount after drying the long-chain alkyl release agent on the surface opposite to the surface coated with the adhesive was 0.5 g / and m 2, and the coating dried winding, to obtain a pressure-sensitive adhesive tape a.
About the obtained adhesive tape, adhesiveness, unwinding property, water-resistant holding power, and water peelability were evaluated.
Adhesive strength: The adhesive strength to the SUS plate was measured according to JIS Z0237.
Unwinding property: When unwinding the tape, it was confirmed that the tape could be pulled smoothly without tearing and without the adhesive being transferred to the back of the tape.
Water resistance retention strength: Affixed to an adherend (H steel core), exposed to the outdoors for 1 week, and visually confirmed that there was no floating or peeling.
Water releasability: Affixed to a SUS plate and immersed in water for 1 week, the tape adhesive dissolves or swells to lower the adhesive strength, so that the tape peels off from the adherend (SUS plate) and the tape floats It was confirmed visually that it came.
Practical test 1:
JX Nippon Oil & Energy Co., Ltd. Cydenol AT-700 / isocyanate-based cross-linking agent manufactured by Seiden Chemical Co., Ltd. = 100/1 on the base material a impregnated with acrylic resin in Milife, the thickness of the tape after drying becomes 150 μm. Then, a long-chain alkyl release agent was applied to the surface opposite to the surface coated with the pressure-sensitive adhesive, wound up after drying, and pressure-sensitive adhesive tape a was obtained.
A sheet having a tape width of 100 mm and a length of 200 mm was prepared and affixed to H steel to evaluate workability.
○: Initial adhesion is weak, re-sticking is effective, and workability is good. Good followability to H steel.
Δ: Initial adhesiveness is weak and re-sticking is effective, but the followability to H steel is insufficient and can be fixed by pressing strongly.
X: The initial adhesiveness is weak, the followability to the adherend is poor, and many floats are observed.
Practical test 2:
In the state fixed in the practical test 1, it was exposed outdoors for one week, and the state was observed.
○ ... No floating or peeling.
Δ: Floating or peeling occurs partially.
X: Many floats and peelings are observed.
Practical test 3:
A 300mm x 300mm x 300mm corrugated cardboard is installed in the ground, and steel H is installed in the corrugated cardboard box fixed in the practical test 1, cement is poured into the corrugated cardboard box, and cracks occur in the hardened cement lump after one week. And cement. Cement adhering to the removed H steel was removed, and the workability at that time and the surface state of the H steel after removing the sheet were observed.
○: Cement near the H steel can be easily beaten, and the surface of the H steel is clean.
Δ: The cement in the vicinity of H steel can be easily beaten, but the surface of H steel is dirty.
X: Difficult to grind cement near H steel. The surface of H steel is dirty.
（基材の調整）
ＪＸ日鉱日石エネルギー ミライフ（ポリエステル系不織布）を原反として使用し、アクリル樹脂を含浸処理して基材ａを得た。
（粘着剤の調整）
サイデン化学株式会社製サイビノールＡＴ−７００を粘着剤ｂとする。
（粘着テープの製造）
基材ａに乾燥後のテープの厚みが１５０μｍになるように粘着剤ｂを塗布し、さらに粘着剤を塗工した面の反対の面に長鎖アルキル系剥離剤を乾燥後の塗布量０．５ｇ／ｍ２になるように塗布し、乾燥後巻取り、粘着テープｂを得た。
(Adjustment of base material)
The base material a was obtained by impregnating the acrylic resin using JX Nippon Oil & Energy Corporation Milife (polyester nonwoven fabric) as a raw material.
(Adhesive adjustment)
Let Cybinol AT-700 manufactured by Seiden Chemical Co., Ltd. be the adhesive b.
(Manufacture of adhesive tape)
The adhesive b was applied to the base material a so that the thickness of the tape after drying was 150 μm, and the coating amount after drying the long-chain alkyl release agent on the surface opposite to the surface coated with the adhesive was 0. It apply | coated so that it might become 5 g / m < 2 >, and it wound up after drying, and obtained the adhesive tape b.
和紙を原反として使用し、基材ｂを得た。
（粘着剤の調整）
サイデン化学株式会社製サイビノールＡＴ−７００を粘着剤ｂとする。
（粘着テープの製造）
基材ｂに乾燥後のテープの厚みが１００μｍになるように粘着剤ｂを塗布し、さらに粘着剤を塗工した面の反対の面に長鎖アルキル系剥離剤を乾燥後の塗布量０．５ｇ／ｍ２になるように塗布し、乾燥後巻取り、粘着テープｃを得た。
A base paper b was obtained using Japanese paper as a raw fabric.
(Adhesive adjustment)
Let Cybinol AT-700 manufactured by Seiden Chemical Co., Ltd. be the adhesive b.
(Manufacture of adhesive tape)
The adhesive b was applied to the substrate b so that the thickness of the tape after drying was 100 μm, and the coating amount after drying the long-chain alkyl release agent on the surface opposite to the surface coated with the adhesive was 0. It apply | coated so that it might become 5 g / m < 2 >, and it wound up after drying and obtained the adhesive tape c.
ポリエステル系基材フラットヤーン（ポリエステル系フィルム）を原反として、粘着剤を塗工する面にコロナ処理を施した基材ｃを得た。
（粘着剤の調整）
サイデン化学株式会社製サイビノールＡＴ−７００を粘着剤ｂとする。
（粘着テープの製造）
基材ｃに乾燥後のテープの厚みが１５０μｍになるように粘着剤ｂを塗布し、乾燥後巻取り、粘着テープｄを得た。
Using a polyester-based substrate flat yarn (polyester-based film) as an original fabric, a substrate c having a corona treatment applied to the surface on which the adhesive was applied was obtained.
(Adhesive adjustment)
Let Cybinol AT-700 manufactured by Seiden Chemical Co., Ltd. be the adhesive b.
(Manufacture of adhesive tape)
The pressure-sensitive adhesive b was applied to the substrate c so that the thickness of the tape after drying was 150 μm, and wound after drying to obtain a pressure-sensitive adhesive tape d.
（比較例１）
（基材の調整）
ＪＸ日鉱日石エネルギー ミライフを原反として使用し、アクリル樹脂を含浸処理して基材ａを得た。
（粘着剤の調整）
日本カーバイド工業株式会社製ニッセツＫＰ−９７７Ｌに架橋剤として日本カーバイド工業株式会社製架橋剤ＣＫ−１０１を２．０質量部添加し、十分に攪拌した粘着剤ｃを得た。
（粘着テープの製造）
基材ａに乾燥後のテープの厚みが１５０μｍになるように粘着剤ｃを塗布し、さらに粘着剤を塗工した面の反対の面に長鎖アルキル系剥離剤を乾燥後の塗布量０．５ｇ／ｍ２になるように塗布し、乾燥後巻取り、粘着テープｅを得た。
(Comparative Example 1)
(Adjustment of base material)
The base material a was obtained by impregnating an acrylic resin using JX Nippon Oil & Energy Corporation Milife as a raw material.
(Adhesive adjustment)
2.0 parts by mass of a cross-linking agent CK-101 manufactured by Nippon Carbide Industries Co., Ltd. was added as a cross-linking agent to Nisset KP-977L manufactured by Nippon Carbide Industries Co., Ltd. to obtain a sufficiently stirred pressure-sensitive adhesive c.
(Manufacture of adhesive tape)
The adhesive c was applied to the substrate a so that the thickness of the tape after drying was 150 μm, and the coating amount after drying the long-chain alkyl release agent on the surface opposite to the surface coated with the adhesive was 0. It apply | coated so that it might become 5 g / m < 2 >, wound up after drying, and obtained the adhesive tape e.
（比較例２）
ＪＸ日鉱日石エネルギー ミライフを原反として使用し、アクリル樹脂を含浸処理して基材ａを得た。
（粘着剤の調整）
株式会社クラレ製ポバールを温水に十分に攪拌した粘着剤ｄを得た。
（粘着テープの製造）
基材ａに乾燥後の厚みが１５０μｍになるように粘着剤ｄを塗布し、さらに粘着剤を塗工した面の反対の面に長鎖アルキル系剥離剤を乾燥後の塗布量０．５ｇ／ｍ２になるように塗布し、乾燥後巻取り、粘着テープfを得た。
得られた粘着テープについて、引張強度、伸び率、接着性、耐水保持力、水剥離性を評価し、表１に示す。
(Comparative Example 2)
The base material a was obtained by impregnating an acrylic resin using JX Nippon Oil & Energy Corporation Milife as a raw material.
(Adhesive adjustment)
A pressure-sensitive adhesive d in which Kuraray Co., Ltd. Poval was sufficiently stirred in warm water was obtained.
(Manufacture of adhesive tape)
An adhesive d was applied to the substrate a so that the thickness after drying was 150 μm, and a long-chain alkyl release agent was applied on the surface opposite to the surface on which the adhesive was applied. and m 2, and the coating dried winding, to obtain a pressure-sensitive adhesive tape f.
About the obtained adhesive tape, tensile strength, elongation rate, adhesiveness, water-resistant holding power, and water peelability are evaluated and are shown in Table 1.
本発明のソイルセメント斫り方法は、工事作業時間及び労力、騒音や振動等の環境負荷を大幅に削減することができるため、建設工事が効率よく行え、産業上きわめて利用可能性が高いものである。
The soil cement grinding method according to the present invention can greatly reduce the construction work time and labor, and the environmental load such as noise and vibration. Therefore, the construction work can be efficiently carried out, and the industrial applicability is extremely high. is there.
１ ソイルセメント
２ Ｈ鋼
３ 粘着シート
４ 斫る部分のソイルセメント
５ ガス切断するフランジ部分
６ ガス切断されたフランジ部分
７ フランジ内のソイルセメント
DESCRIPTION OF SYMBOLS 1 Soil cement 2
Claims (5)
The pressure-sensitive adhesive tape for soil cement grinding according to claim 4, wherein the base material is Japanese paper, crepe paper or nonwoven fabric having moisture permeability, and the pressure-sensitive adhesive is a water-soluble or water-swellable acrylic copolymer.
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| JP2012280299A JP6059978B2 (en) | 2012-12-21 | 2012-12-21 | Adhesive tape for soil cement used in the mountain fastening method |
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| JP6059978B2 (en) | 2017-01-11 |
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