JPH073768A - Method for stabilizing treatment of earth to be refilled - Google Patents
Method for stabilizing treatment of earth to be refilledInfo
- Publication number
- JPH073768A JPH073768A JP16866593A JP16866593A JPH073768A JP H073768 A JPH073768 A JP H073768A JP 16866593 A JP16866593 A JP 16866593A JP 16866593 A JP16866593 A JP 16866593A JP H073768 A JPH073768 A JP H073768A
- Authority
- JP
- Japan
- Prior art keywords
- calcium hydroxide
- water glass
- earth
- chemical
- water
- 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
- 238000000034 method Methods 0.000 title claims description 15
- 230000000087 stabilizing effect Effects 0.000 title claims description 7
- 239000002689 soil Substances 0.000 claims abstract description 40
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 36
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 36
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 36
- 239000000126 substance Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002245 particle Substances 0.000 claims abstract description 22
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 21
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000725 suspension Substances 0.000 claims abstract description 8
- 230000003204 osmotic effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 2
- 229940079593 drug Drugs 0.000 claims description 2
- 239000004576 sand Substances 0.000 abstract description 12
- 239000010419 fine particle Substances 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000007654 immersion Methods 0.000 abstract 1
- 239000012466 permeate Substances 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 31
- 235000011116 calcium hydroxide Nutrition 0.000 description 29
- 230000035699 permeability Effects 0.000 description 11
- 238000002474 experimental method Methods 0.000 description 7
- 238000007596 consolidation process Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000001879 gelation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- DWKNOLCXIFYNFV-HSZRJFAPSA-N 2-[[(2r)-1-[1-[(4-chloro-3-methylphenyl)methyl]piperidin-4-yl]-5-oxopyrrolidine-2-carbonyl]amino]-n,n,6-trimethylpyridine-4-carboxamide Chemical compound CN(C)C(=O)C1=CC(C)=NC(NC(=O)[C@@H]2N(C(=O)CC2)C2CCN(CC=3C=C(C)C(Cl)=CC=3)CC2)=C1 DWKNOLCXIFYNFV-HSZRJFAPSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- LFYJSSARVMHQJB-QIXNEVBVSA-N bakuchiol Chemical compound CC(C)=CCC[C@@](C)(C=C)\C=C\C1=CC=C(O)C=C1 LFYJSSARVMHQJB-QIXNEVBVSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- -1 electricity Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002357 osmotic agent Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、地盤を開削または掘
削して地下に上下水道、電気、ガス等の埋設管や地下構
造物（以下、地下構造物という）を築造または敷設した
後、その周辺に土砂を埋め戻すようにした工事におい
て、地下構造物周辺に埋戻した土を安定させるためこれ
に固結薬液を散布または注入して、埋戻し土の強化並び
に透水性を減少させるための埋戻し土の安定化処理方法
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, after excavating or excavating the ground, constructing or laying underground pipes and underground structures (hereinafter referred to as underground structures) for water and sewage, electricity, gas, etc. For the purpose of stabilizing the backfilled soil around the underground structure in the construction in which the backfilled soil is refilled, a solidifying chemical is sprayed or injected to strengthen the backfilled soil and reduce the water permeability. The present invention relates to a method for stabilizing backfill soil.
【０００２】[0002]
【従来の技術】従来の埋戻し土の安定化処理方法は、地
盤を開削または掘削して地下に地下構造物を築造（ある
いは敷設）した後、山砂等の砂質土でできるだけ密に突
き固めて埋戻す場合が多く、また埋戻し土にセメント、
石灰等の固化材を添加した上で埋戻す方法もとられてい
る。2. Description of the Related Art The conventional method for stabilizing backfilled soil is to excavate or excavate the ground to build (or lay) an underground structure underground, and then project it as closely as possible with sandy soil such as mountain sand. Often hardened and backfilled, cement in backfilled soil,
A method of backfilling after adding a solidifying material such as lime is also used.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の地下構造物
の周辺の埋戻し土の安定化処理には次のような問題点が
ある。The above-mentioned conventional stabilization treatment of backfill soil around the underground structure has the following problems.
【０００４】（イ）従来最も多い山砂等の浸透性のある
砂質土そのものを埋戻す方法では、埋戻しする地下構造
物の周辺空隙は非常に幅狭い局部的なものであり、一般
の盛土のように拡がりのある大きな埋立範囲が確保され
ている場合とは異なり、重機などで機械的に転圧するこ
とは困難であって、充分に締固めた埋戻しを期待するこ
とはできない。(A) In the method of backfilling sandy soil itself, which has the highest permeability in the past, such as mountain sand, the void around the underground structure to be backfilled is very narrow and local. Unlike the case where a large landfill area with a wide spread is secured such as embankment, it is difficult to mechanically compact with a heavy machine and it is not possible to expect a sufficiently compacted backfill.
【０００５】このため、自動車等の走行車輛の振動や地
震等により地盤沈下が発生し、道路面下では空洞を生じ
たり、あるいは路面まで陥没するという問題がある。Therefore, there is a problem that ground subsidence occurs due to vibration of a traveling vehicle such as an automobile or an earthquake, and a cavity is formed under the road surface or the road surface is depressed.
【０００６】特に、上水及び下水道等では、上記路面の
陥没などにより敷設管の接続部が損壊し、漏水あるいは
地下水の浸入が起こり、さらに大きな空洞が発生した場
合には周辺地盤（自然地盤も含めて）の沈下が発生する
という問題がある。Particularly, in waterworks and sewerage systems, when the above-mentioned road surface is depressed, the connection portion of the laying pipe is damaged, and water leaks or infiltration of groundwater occurs. There is a problem that subsidence occurs.
【０００７】（ロ）一方、埋戻し土（砂質土）に小量の
固化材を加える方法では、ある程度の固結強度を高める
ことができるが、固化材が粉体であり、均一に攪拌混合
することは非常に困難であると共に、透水性を減少させ
ることはできないという問題点がある。(B) On the other hand, the method of adding a small amount of the solidifying material to the backfilled soil (sandy soil) can increase the consolidation strength to some extent, but the solidifying material is a powder and is uniformly stirred. Mixing is very difficult, and the water permeability cannot be reduced.
【０００８】以上のように、従来の埋戻し土の安定化処
理方法は、多くの問題点を包含しており、このような問
題点を解決するには固結強度、並びに透水性の減少を改
善した安定化処理方法の開発が望まれる。As described above, the conventional method for stabilizing backfilled soil contains many problems. To solve these problems, it is necessary to reduce the consolidation strength and the water permeability. Development of an improved stabilization treatment method is desired.
【０００９】[0009]
【課題を解決するための手段】この発明は、埋戻し土を
固結させる薬液として、水に投入してなる難溶性の平均
粒径約８ミクロン以下の微粒子水酸化カルシウムを薬液
１m3当たり 2.5〜25kgを含有した懸濁液に、水ガラスを
加えることにより、水酸化カルシウムの大部分を溶解さ
せてなる浸透性薬液を、埋戻し土に散布または注入して
固結させるようにした埋戻し土の安定化処理方法を提案
するものである。As a chemical solution for consolidating backfilled soil, the present invention uses a sparingly soluble particulate calcium hydroxide having an average particle size of about 8 microns or less, which is 2.5 times per 1 m 3 of the chemical solution. Water glass was added to a suspension containing ~ 25 kg, and the osmotic drug solution, in which most of the calcium hydroxide was dissolved, was sprayed or poured into the backfill soil to be solidified. We propose a method for stabilizing soil.
【００１０】[0010]
【作用】水酸化カルシウムは水に対する溶解度20℃で
0.165g/水100gで、水に極く僅かしか溶けない難溶性ア
ルカリであるが、水ガラス成分の存在のもとでは実用に
充分な量が溶解し、その添加量に応じたゲルタイムで水
ガラスをゲル化させる。[Function] Calcium hydroxide has a solubility in water of 20 ° C
0.165 g / 100 g of water, it is a sparingly soluble alkali that is very slightly soluble in water, but in the presence of water glass components, it dissolves in an amount sufficient for practical use, and water glass with gel time according to the amount added To gel.
【００１１】この水酸化カルシウムは、多少添加量がバ
ラツいてもゲルタイムの変化が少なく、ゲルタイムの調
整が（ゲルタイム3〜150分）が容易で施工性に非常に優
れ、またゲル能力が優れており、小量の硬化剤でも固結
させることができる等埋戻し土の固結剤として非常に優
れている。[0011] This calcium hydroxide has little change in gel time even if the addition amount varies, gel time is easily adjusted (gel time 3 to 150 minutes), workability is excellent, and gel ability is excellent. It is very excellent as a solidifying agent for backfilled soil because it can be solidified with a small amount of hardener.
【００１２】[0012]
【実施例】本発明の埋戻し土の安定化処理方法は、従来
懸濁型（非浸透性）薬液として、セメント成分のみでは
瞬結タイプとすることができないという課題に対し、ゲ
ル化促進剤として補助的（単独で使用することはない）
に使われている水酸化カルシウム（粉末）が、水ガラス
との間で特異な反応を起こすことをつきとめ、浸透性薬
液としての性能を充分に満足する薬液を用いることによ
り完成するに至ったものである。[Examples] The stabilization treatment method for backfilled soil of the present invention is a gelation accelerator for the problem that the conventional suspension type (non-permeable) chemical liquid cannot be made into the instantaneous setting type only with cement components. As an auxiliary (never used alone)
It was discovered that the calcium hydroxide (powder) used in the product causes a peculiar reaction with water glass, and was completed by using a chemical solution that sufficiently satisfies the performance as an osmotic chemical solution. Is.
【００１３】即ち、水酸化カルシウムは水に対する溶解
度が20℃で 0.165g/水100gで、水に極く僅かしか溶けな
い難溶性アルカリであることは周知の通りであるが、水
ガラスの成分の存在のもとでは実用に充分な量が溶解す
ることが判った。That is, it is well known that calcium hydroxide has a solubility in water of 0.165 g / 100 g of water at 20 ° C., and it is well known that it is a sparingly soluble alkali which is very slightly soluble in water. It has been found that, in the presence of it, a practically sufficient amount dissolves.
【００１４】本発明の水酸化カルシウム粉末が、水ガラ
スの存在のもとで溶ける量は、粉末度、水ガラスの種
類、水ガラスとの接触時間および混合方法等に影響され
るが、なかでも特に粉末度の影響が大である。The amount of the calcium hydroxide powder of the present invention that dissolves in the presence of water glass is affected by the fineness of powder, the type of water glass, the contact time with water glass, the mixing method, and the like. Especially, the influence of the fineness is great.
【００１５】実施例からみれば水酸化カルシウムの大部
分（50％以上）が溶解される量は、薬液１m3当たり約25
kg程度がある。From the examples, the amount of most (50% or more) of calcium hydroxide dissolved is about 25 per 1 m 3 of the chemical solution.
There is about kg.
【００１６】また、本発明の水酸化カルシウムの粉末度
は、できるだけ微粒化したものが好ましいが、現状での
技術的制約を考慮して平均粒径約８ミクロンより細かい
微粒子を基準とした。Further, the fineness of the calcium hydroxide of the present invention is preferably as fine as possible, but in view of technical restrictions at present, fine particles finer than the average particle diameter of about 8 microns are taken as a standard.
【００１７】本発明はこのような微粒子を用いるため、
薬液中に極く小量の不溶性粒子が存在しても、砂質土に
浸透可能である。Since the present invention uses such fine particles,
Even if a very small amount of insoluble particles are present in the chemical solution, it can penetrate the sandy soil.
【００１８】即ち、砂の粒子が非常に細かい微細砂であ
って、例え水酸化カルシウム粒子が浸透できなくとも薬
液中に含まれる量が非常に少ないため、溶液部分の浸透
を阻害することはほとんどなく、従来の溶液型と同程度
あるいはそれに近い浸透性を示す。That is, even if the particles of sand are very fine and fine, and even if the calcium hydroxide particles cannot penetrate, the amount contained in the chemical solution is very small, so that the penetration of the solution part is hardly inhibited. However, it exhibits permeability equivalent to or close to that of the conventional solution type.
【００１９】本発明の薬液においてより高強度を求める
場合は、微粒子（平均粒径約８ミクロン以下）の水さい
スラグやセメントを併用することができる。When higher strength is required in the chemical solution of the present invention, fine particles (average particle size of about 8 microns or less) of water slag or cement can be used in combination.
【００２０】周知の通りスラグは、アルカリ刺激剤（水
酸化カルシウムやセメント）の存在のもとでは早期に硬
化を発揮する。As is well known, slag exhibits early hardening in the presence of an alkaline stimulant (calcium hydroxide or cement).
【００２１】従って、スラグ粒子との併用を考慮すれ
ば、若干の粒子としての水酸化カルシウムは砂質土での
浸透過程でスラグ粒子と同一挙動を起こすため、スラグ
の早期強度の発現からみれば、かえって若干の水酸化カ
ルシウム粒子は必要である。Therefore, considering the combined use with slag particles, calcium hydroxide as some particles behaves in the same manner as slag particles in the process of infiltrating sandy soil, so from the viewpoint of early development of slag strength. On the contrary, some calcium hydroxide particles are necessary.
【００２２】そのため、本発明で使用する水酸化カルシ
ウムの量は、薬液１m3当たり約 2.5〜25kgの範囲として
いる。Therefore, the amount of calcium hydroxide used in the present invention is in the range of about 2.5 to 25 kg per 1 m 3 of the chemical solution.
【００２３】即ち、水酸化カルシウム量１m3当たり約
2.5kg以下であってもゲル化能力を有しているが、固結
強度があまりにも小さくなるため敢えて本発明より除外
した。That is, about 1 m 3 of calcium hydroxide
Although it has gelation ability even at 2.5 kg or less, it was intentionally excluded from the present invention because the consolidation strength is too small.
【００２４】一方、逆に水酸化カルシウム量が１m3当た
り約25kg以上になると、溶解分に比べ不溶解分が多くな
る傾向にあり、一定の目安とした。On the other hand, on the contrary, when the amount of calcium hydroxide is about 25 kg or more per 1 m 3, the amount of insoluble matter tends to increase as compared with the amount of soluble matter.
【００２５】しかし、対象となる埋戻し土の種類によっ
ては、本発明の浸透性薬液としての技術的範囲を充分に
発揮することができる場合には、水酸化カルシウム量が
上記限値より多少越えても本発明の範囲とみなすことが
できる。However, depending on the type of the backfill soil to be used, if the technical range of the osmotic agent of the present invention can be sufficiently exerted, the amount of calcium hydroxide slightly exceeds the above limit value. However, it can be regarded as the scope of the present invention.
【００２６】本発明の水に投入してなる難溶性の微粒子
水酸化カルシウムとは、水に投入した場合に Ca(OH)2と
いう物質で存在するもので、具体的には消石灰及び生石
灰である。The sparingly soluble particulate calcium hydroxide added to water of the present invention exists as a substance called Ca (OH) 2 when added to water, and is specifically slaked lime and quick lime. .
【００２７】また、本発明は微粒子の従来技術と同様
に、分散剤や必要あれば遅延剤、その他の添加剤を用い
ることができることは勿論である。Further, in the present invention, it is a matter of course that a dispersant, a retarder if necessary, and other additives can be used as in the prior art of fine particles.
【００２８】また、本発明の限定範囲以外の薬液であっ
ても、本発明の薬液と同様の性質を備え、施工的にも充
分満足できる結果が得られるものであれば、本発明の埋
戻し土の固結剤として使用できる。Further, even if the chemical liquid is out of the limited range of the present invention, as long as it has the same properties as the chemical liquid of the present invention and the result which is satisfactory in construction can be obtained, the backfilling of the present invention is carried out. Can be used as a solidifying agent for soil.
【００２９】本発明の埋戻し土を固結させるための施工
方法としては特に限定するものではないが、次の２つの
方法を採用することができる。The construction method for consolidating the backfill soil of the present invention is not particularly limited, but the following two methods can be adopted.
【００３０】(A) 埋設管等の地下構造物が比較的浅い場
合、管周辺を山砂等の砂質土で密に埋戻した後、ゲルタ
イムが約30分以上と長い薬液（Ａ液として水ガラス、Ｂ
液として微粒子の水酸化カルシウム懸濁液との混合液）
を散布して埋戻し土に浸透させて固結させる。(A) When the underground structure such as the buried pipe is relatively shallow, after the area around the pipe is densely backfilled with sandy soil such as mountain sand, a gel solution with a long gel time of about 30 minutes or more (as liquid A) Water glass, B
Liquid mixed with fine particle calcium hydroxide suspension as liquid)
To infiltrate the backfill soil and solidify.
【００３１】(B) 地下構造物が比較的深い場合、砂質土
を埋戻す時に同時に注入パイプを埋設するか、あるいは
埋戻し後に注入パイプを挿入して薬液を注入する。(B) When the underground structure is relatively deep, the injection pipe is buried at the same time when the sandy soil is backfilled, or after the backfilling, the injection pipe is inserted to inject the chemical solution.
【００３２】この場合、特に限定されるのではないが、
薬液のゲルタイムが20〜30分以上の時は１ショット方式
（散布と同様、Ａ、Ｂ液の混合液）を、またゲルタイム
が20〜30分以下の時は 1.5ショット方式（Ａ、Ｂ液を別
々のポンプで圧送し注入パイプの頭部で両液を合流）で
注入して埋戻し土および周辺地山を含めて浸透固結させ
る。In this case, although not particularly limited,
When the gel time of the chemical solution is 20 to 30 minutes or more, the 1-shot method (similar to spraying, mixed solution of A and B solutions), and when the gel time is 20 to 30 minutes or less, the 1.5-shot method (A and B solutions Pump them with separate pumps and inject both solutions at the head of the injection pipe) to infiltrate and consolidate the backfill soil and surrounding rocks.
【００３３】また、上記の施工方法において注入パイプ
を用いる場合には、埋戻し土（乱した土）の他に自然地
盤（乱さない土）にも本発明の薬液を浸透させることが
できるのは勿論である。When the injection pipe is used in the above-mentioned construction method, the chemical solution of the present invention can be made to penetrate not only backfilled soil (disturbed soil) but also natural ground (undisturbed soil). Of course.
【００３４】以上のような施工法により、地下構造物周
辺の埋戻し土を薬液を浸透させて固結することにより、
地盤の強度増加と共に透水性を減少させる。By the above-mentioned construction method, the backfill soil around the underground structure is infiltrated with the chemical solution and solidified,
Reduces water permeability as the soil strength increases.
【００３５】このため、車輛等の振動並びに地震、それ
らによる地盤沈下、これに伴なう空洞や路面（道路）の
陥没等を防止でき、その結果埋設管等の地下構造物の破
損等を防止することができ、また仮に上下水道の埋設管
が破損しても漏水が少なく、また管周囲の埋戻し土が固
結しているため、砂の流出は少なく、空洞や陥没等を防
止することができる。Therefore, it is possible to prevent vibrations of vehicles and earthquakes, earthquakes, ground subsidence due to these, and accompanying depressions of cavities and road surfaces (roads), and as a result, damage to underground structures such as buried pipes. In addition, even if the buried pipe of the water supply and sewerage is damaged, there is little water leakage, and since the backfill soil around the pipe is solidified, the outflow of sand is small and it is possible to prevent cavities and depressions. You can
【００３６】以下さらに本発明の薬液について実施例を
挙げて詳しく説明する。The chemical solution of the present invention will be described in detail below with reference to examples.
【００３７】実験に用いた水酸化カルシウムは、図１に
示す粒子径（粒径分布）の異なる試料１（平均粒径10.9
μ）、試料２（平均粒径5.3μ）、試料３（平均粒径2.8
μ）の３種類、水ガラスはＪＩＳ号品を用いた。The calcium hydroxide used in the experiment was the sample 1 (average particle size 10.9) having different particle sizes (particle size distribution) shown in FIG.
μ), sample 2 (average particle size 5.3μ), sample 3 (average particle size 2.8
μ) and water glass were JIS No. products.
【００３８】また埋戻し土として下記表１の性質を示す
千葉県産出の山砂を用いた。As the backfill soil, mountain sand produced in Chiba prefecture having the properties shown in Table 1 below was used.
【００３９】[0039]
【表１】 [Table 1]
【００４０】「実験−１」 水に懸濁した微粒子の水酸
化カルシウムが水ガラスの存在のもとに溶解する量を確
認するため、一定時間両者を攪拌混合した後、濾紙（東
洋濾紙製No.2）で吸引濾過により固液分離して溶解量を
測定した。[Experiment-1] In order to confirm the amount of finely divided calcium hydroxide suspended in water to dissolve in the presence of water glass, both were stirred and mixed for a certain period of time, and then a filter paper (No. In .2), solid-liquid separation was performed by suction filtration, and the amount of dissolution was measured.
【００４１】さらに、濾過した溶液（薬液）のゲルタイ
ムを測定し、併せて上記水酸化カルシウムの微粒子と水
ガラスをゲル化に到るまで常時攪拌混合した場合のゲル
タイムを測定した。その結果を表２に示す。Further, the gel time of the filtered solution (chemical solution) was measured, and also the gel time when the fine particles of calcium hydroxide and water glass were constantly stirred and mixed until gelling was measured. The results are shown in Table 2.
【００４２】[0042]
【表２】 [Table 2]
【００４３】表２の水ガラスに溶解した量の欄におい
て、＊印はＡ、Ｂ両液を３秒攪拌した結果を、＊＊印は
同60秒攪拌した効果を、さらに註）以下の無印は同30秒
攪拌した結果を示す。In the column of the amount dissolved in water glass in Table 2, * indicates the result of stirring both liquids A and B for 3 seconds, ** indicates the effect of stirring for 60 seconds, and further note) Shows the result of stirring for 30 seconds.
【００４４】上記の表２より、水に難溶性（ 0.165g/水
100g）の水酸化カルシウムが水ガラスの存在のもとでは
極めて多量に溶解することがわかり、しかもその溶解量
は水酸化カルシウムの粉末度および攪拌時間に影響さ
れ、なかでも前者の影響が大きいことが判明した。From Table 2 above, it is poorly soluble in water (0.165 g / water
It was found that 100 g) of calcium hydroxide was dissolved in a very large amount in the presence of water glass, and the amount of dissolution was affected by the fineness of calcium hydroxide and the stirring time, with the former having a large effect. There was found.
【００４５】また、ゲル化するまで水ガラスと水酸化カ
ルシウム微粒子を常時混合したゲルタイムに対して、粒
子部分を除いた溶液部分のゲルタイムは遅延されるが、
その度合いは粒子の粉末度に大きく影響され、特に粉末
度が平均粒径10ミクロン（試料１）では差が大きいこと
がわかる。Further, the gel time of the solution portion excluding the particle portion is delayed compared with the gel time of constantly mixing water glass and calcium hydroxide fine particles until gelation occurs,
It can be seen that the degree is greatly influenced by the fineness of the particles, and especially when the fineness is 10 micron (Sample 1) having an average particle size.
【００４６】上記の溶解量およびゲルタイムからみて、
本発明で用いる水酸化カルシウムの粉末度は平均粒径約
８ミクロン以下の微粒子が好ましく、本発明の範囲とし
た。From the above-mentioned dissolved amount and gel time,
The fineness of the calcium hydroxide used in the present invention is preferably fine particles having an average particle diameter of about 8 microns or less, and is within the range of the present invention.
【００４７】「実験−２」 本発明の薬液を山砂に散布
した場合の固結強度並びに透水性の減少をみるため次の
実験を行った。[Experiment-2] The following experiment was carried out in order to see the reduction in the caking strength and the water permeability when the chemical solution of the present invention was sprayed on the sand.
【００４８】固結強度の試料作成は、底部を密閉した内
径約５cm、高さ15cmの塩化ビニール管（モールド）に山
砂を３層に分けて、一層あたり５回（径 4.8cmのつき棒
を木づちで）強く叩いて密に詰めた。The sample of the consolidation strength was prepared by dividing the sand into three layers in a vinyl chloride tube (mold) having an inner diameter of about 5 cm and a height of 15 cm, the bottom of which was sealed 5 times per layer (a stick with a diameter of 4.8 cm). I slammed it tightly and packed it tightly.
【００４９】この試料の上部より表２の実施例−２の薬
液（Ａ、Ｂ混合液）をジョウロから充分に散布した固結
させた。From the upper part of this sample, the chemical solution of Example-2 in Table 2 (mixture of A and B) was thoroughly sprayed from a watering can and solidified.
【００５０】１日後に脱枠、高さ10cmに整型して７日間
養生し、一軸圧縮強度を測定したところ1.8kgf/cm2であ
った。After 1 day, it was deframed, shaped to a height of 10 cm, aged for 7 days, and the uniaxial compressive strength was measured and found to be 1.8 kgf / cm 2 .
【００５１】また、透水係数は前記と同様な方法で内径
10cm高さ15cmの固結物を作り、JISＡ1218Ｔに準じて測
定したところ、2.5×10-6cm/secであり、未処理の山砂
に比べて透水係数は大幅に減少していた。The water permeability is determined by the same method as above.
When a solidified product having a height of 10 cm and a height of 15 cm was prepared and measured according to JIS A1218T, it was 2.5 × 10-6 cm / sec, and the hydraulic conductivity was significantly reduced as compared with untreated sand.
【００５２】「実験−３」 本発明の薬液を山砂に注入
した場合の固結強度並びに透水性の実験を行った。[Experiment-3] An experiment was conducted on the consolidation strength and water permeability when the chemical solution of the present invention was poured into sand.
【００５３】固結強度の試料の作成は、実験−２と同様
に内径５cm、高さ15cmのモールドに山砂を密に詰めた。A sample having a consolidation strength was prepared in the same manner as in Experiment 2, in which a mold having an inner diameter of 5 cm and a height of 15 cm was densely packed with sand.
【００５４】また注入は、表２の実施例−11の薬液
（Ａ、Ｂ混合液）をモールドの下方から圧入した。その
時の注入圧力は約0.5kgf/cm2以下であった。For the injection, the chemical solution (mixture A, B) of Example-11 in Table 2 was pressed into the mold from below. The injection pressure at that time was about 0.5 kgf / cm 2 or less.
【００５５】以下実験−２と同様一軸圧縮強度を測定し
たところ3.1kgf/cm2であった。When the uniaxial compressive strength was measured as in Experiment 2 below, it was 3.1 kgf / cm 2 .
【００５６】また透水係数も実験−２と同様行ったとこ
ろ 6.8×10-7cm/secと透水係数は大幅に減少していた。[0056] The permeability coefficient similar 6.8 × 10- 7 cm / sec and the hydraulic conductivity was carried out as in Experiment -2 was greatly reduced.
【００５７】以上の実験−２及び実験−３に示したよう
に、薬液を散布又は注入することにより、地下構造物周
辺の埋戻し土を地盤強化並びに透水性の減少をもたら
し、安定させることができる。As shown in the above Experiment-2 and Experiment-3, by spraying or injecting the chemical solution, it is possible to stabilize the backfilled soil around the underground structure by strengthening the ground and reducing permeability. it can.
【００５８】[0058]
【発明の効果】以上の通りこの発明によれば、地下構造
物周辺の埋戻し土の固結剤として用いる薬液の硬化剤と
して微粒子の水酸化カルシウムを、水ガラスの存在のも
とに大部分を薬液中に溶解させた浸透性薬液で地下構造
物周辺の埋戻し土を固結させることにより、地下構造物
の防護並びその周辺地盤を安定化することができる優れ
た埋戻し土の固結法である。As described above, according to the present invention, fine particles of calcium hydroxide are mostly used in the presence of water glass as a hardening agent for a chemical liquid used as a solidifying agent for backfill soil around underground structures. By solidifying the backfill soil around the underground structure with a penetrating chemical solution in which the soil is dissolved in the chemical solution, it is possible to protect the underground structure and stabilize the surrounding ground. Is the law.
【図１】この発明の実験に用いた水酸化カルシウムの各
試料の粒径分布図。FIG. 1 is a particle size distribution chart of each sample of calcium hydroxide used in the experiment of the present invention.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 久保田 賢 神奈川県横浜市緑区しらとり台22の２ (72)発明者 富田 茂芳 東京都江東区南砂５−19−16 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Ken Kubota 22-2 Shiratoridai, Midori-ku, Yokohama-shi, Kanagawa (72) Inventor Shigeyoshi Tomita 5-19-16 Minamisuna, Koto-ku, Tokyo
Claims (1)
微粒子水酸化カルシウムを薬液１m3当たり約 2.5〜25kg
含有した懸濁液に、水ガラスを加えることにより、前記
水酸化カルシウムの大部分を溶解させた浸透性薬液を、
埋戻し土に散布または注入して固結させることを特徴と
する埋戻し土の安定化処理方法。Approximately 2.5 to 25 kg of finely divided calcium hydroxide having a mean particle size of about 8 microns or less that is poured into water per 1 m 3 of chemical solution
By adding water glass to the suspension containing the osmotic drug solution in which most of the calcium hydroxide is dissolved,
A method for stabilizing backfill soil, which comprises spraying or pouring the backfill soil to solidify.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5168665A JP2889464B2 (en) | 1993-06-14 | 1993-06-14 | Stabilization method for backfill soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5168665A JP2889464B2 (en) | 1993-06-14 | 1993-06-14 | Stabilization method for backfill soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH073768A true JPH073768A (en) | 1995-01-06 |
| JP2889464B2 JP2889464B2 (en) | 1999-05-10 |
Family
ID=15872234
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| Application Number | Title | Priority Date | Filing Date |
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| Country | Link |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01176262A (en) * | 1987-12-31 | 1989-07-12 | Kyokado Eng Co Ltd | Binder |
-
1993
- 1993-06-14 JP JP5168665A patent/JP2889464B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01176262A (en) * | 1987-12-31 | 1989-07-12 | Kyokado Eng Co Ltd | Binder |
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