JPH0762651A - Frozen anchor construction method - Google Patents
Frozen anchor construction methodInfo
- Publication number
- JPH0762651A JPH0762651A JP23080793A JP23080793A JPH0762651A JP H0762651 A JPH0762651 A JP H0762651A JP 23080793 A JP23080793 A JP 23080793A JP 23080793 A JP23080793 A JP 23080793A JP H0762651 A JPH0762651 A JP H0762651A
- Authority
- JP
- Japan
- Prior art keywords
- anchor
- freezing
- pipe
- trunk
- ground
- 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.)
- Pending
Links
Landscapes
- Piles And Underground Anchors (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、軟弱な地盤、水分を
多量に含む地盤などにアンカ−を定着させるための凍結
アンカ−工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freezing anchor method for fixing anchors on soft ground, ground containing a large amount of water, and the like.
【０００２】[0002]
【従来の技術】軟弱地盤にアンカ−を施工しても、アン
カ−引き抜き耐力はあまり期待できない。そのため、十
分な引き抜き耐力が期待できるアンカ−を軟弱地盤で造
成するには、アンカ−を軟弱層の下の締まった地層まで
伸ばす必要がある。2. Description of the Related Art Even if an anchor is installed on soft ground, anchor pull-out proof strength cannot be expected so much. Therefore, in order to construct an anchor with a sufficient pull-out strength on soft ground, it is necessary to extend the anchor to a tight formation below the soft layer.
【０００３】地下水位が高い地盤にアンカ−を施工する
場合は、アンカ−削孔中の孔から多量の湧水が流出す
る。そのため、削孔後、グラウトを注入・加圧すると
き、水頭高さ分の圧力（湧水圧）に負けないような圧力
のもとで、グラウトを注入・加圧しなければならない。When an anchor is installed on the ground where the groundwater level is high, a large amount of spring water flows out from the hole in the hole drilling the anchor. Therefore, when the grout is injected / pressurized after drilling, the grout must be injected / pressurized under a pressure that is not defeated by the pressure of the head height (spring pressure).
【０００４】[0004]
【発明が解決しようとする課題】軟弱地盤に於ける長い
アンカ−（長尺アンカ−）は、隣接する建物の地下部分
や杭に当たったり、敷地の境界線を越えて伸びることに
よって、長尺アンカ−の施工が不可能となることが多
い。A long anchor (long anchor) on soft ground hits an underground portion or a stake of an adjacent building or extends beyond the boundary line of the site to extend the length of the long anchor. In many cases, anchor construction becomes impossible.
【０００５】また、長尺アンカ−の施工が可能である場
合でも、アンカ−自由長が長いため、アンカ−引張材の
弾性伸び量が大きく、そのために山留壁の側圧の変化に
よる山留壁の変位量が大きくなってしまい、山留壁背面
地盤の地盤沈下を起こす虞れがある。Even when a long anchor can be installed, since the anchor free length is long, the elastic elongation of the anchor-tension material is large. Therefore, the mountain retaining wall is changed due to the change of the lateral pressure of the mountain retaining wall. The amount of displacement of the ground will become large, and there is a risk of causing subsidence of the ground on the back surface of the Yamadome wall.
【０００６】地下水が豊富で地下水位が高い地盤にアン
カ−を施工する場合、アンカ−削孔後のグラウト注入・
加圧の施工において、アンカ−削孔から流出する湧水の
圧力が高い。そのため、湧水の圧力に対抗してグラウト
の注入・加圧の施工を入念に行っても、出来上がったア
ンカ−に品質上のばらつきが生じやすく、引き抜き耐力
が不足するアンカ−が生じる虞れがある。When an anchor is constructed on the ground where the groundwater is abundant and the groundwater level is high, grout injection after anchor drilling
During pressurization, the pressure of spring water flowing out from the anchor hole is high. Therefore, even if the grout injection / pressurization is carefully performed against the pressure of the spring water, the quality of the finished anchors tends to vary, and there is a risk that anchors with insufficient pull-out resistance may occur. is there.
【０００７】このような軟弱地盤や地下水を大量に含む
地盤での山留壁の構築方法として、凍結工法が知られて
いる。凍結工法では、冷却液の循環可能なパイプ（凍結
管という）が所定間隔離反して地盤に埋設され、ブライ
ンや低温液化ガスのような冷却液（冷媒）が凍結管に循
環されている。A freezing method is known as a method of constructing a mountain retaining wall on such soft ground or ground containing a large amount of groundwater. In the freezing method, a pipe in which a cooling liquid can be circulated (referred to as a freezing pipe) is buried for a predetermined period of time in the ground, and a cooling liquid (refrigerant) such as brine or low temperature liquefied gas is circulated in the freezing pipe.
【０００８】すると、凍結管を流れる冷却液によって、
凍結管の回りの土中の水分（間隙水）が冷却管を介して
冷却され氷結される。そして、同心円形状に成長した凍
土を相互に連結して山留壁を構築している。Then, by the cooling liquid flowing through the freezing tube,
Moisture (pore water) in the soil around the freezing pipe is cooled and frozen by the cooling pipe. The frozen soil that has grown concentrically is connected to each other to construct the Yamadome wall.
【０００９】しかしながら、凍結工法はアンカ−の定着
においては利用されておらず、現行のアンカ−工法にお
いては、軟弱地盤へのアンカ−の定着は容易でない。However, the freezing method is not used for anchor fixing, and the anchor method is not easy to fix on soft ground in the current anchor method.
【００１０】この発明は、凍結工法を応用して軟弱地盤
へのアンカ−の定着に図る凍結アンカ−工法の提供を目
的としている。An object of the present invention is to provide a freezing anchor construction method for fixing anchors to soft ground by applying the freezing construction method.
【００１１】[0011]
【課題を解決するための手段】この目的を達成するため
に、この発明による凍結アンカ−工法によれば、凍結管
にPC鋼材を組合せてアンカ−幹体とし、このアンカ−幹
体をアンカ−孔に挿入するとともに、水または寒材を注
入している。それから、凍結管に冷却液を流し、周囲の
地盤を冷却、凍結して地盤を固めてからアンカ−を定着
させている。In order to achieve this object, according to the freezing anchor construction method of the present invention, a frozen pipe is combined with PC steel to form an anchor trunk, and the anchor trunk is used as the anchor trunk. Water or cold material is being injected while being inserted into the hole. Then, a cooling liquid is caused to flow through the freezing pipe to cool and freeze the surrounding ground to solidify the ground and then fix the anchor.
【００１２】[0012]
【作用】この工法では、水または寒材を冷却、凍結して
地盤を凍土化するため、軟弱な地盤においても、地中に
強固な凍土の耐力壁が構築でき、アンカ−が十分な引き
抜き耐力のもとで定着できる。[Operation] With this method, the ground is frozen by cooling and freezing water or cold wood, so even in soft ground, a strong frozen soil bearing wall can be constructed in the ground, and the anchors have sufficient pull-out strength. Can be established under the
【００１３】[0013]
【実施例】以下、図面を参照しながらこの発明の実施例
について詳細に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【００１４】図１(A) に示すように、この発明の凍結ア
ンカ−工法によれば、まず、掘削機（ボ−リング機）に
よって山留壁12に孔（掘削孔、ボ−リング孔）14が掘削
される。As shown in FIG. 1 (A), according to the freezing anchor construction method of the present invention, first, a hole (drilling hole, boring hole) is formed in the mountain retaining wall 12 by an excavator (boring machine). 14 are drilled.
【００１５】それから、掘削機のドリルパイプ16をアン
カ−孔14に残し、このドリルパイプに、アンカ−幹体18
を挿入する（図１(B) 参照）。Then, the drill pipe 16 of the excavator is left in the anchor hole 14, and the anchor trunk 18 is attached to the drill pipe.
Insert (see Figure 1 (B)).
【００１６】アンカ−幹体18は凍結管20にPC鋼材22、た
とえばアンボンドPC鋼より線22-1を組合せて構成されて
おり、凍結管は、冷却液を内部に流すことにより周囲を
冷却し凍結する中空体（パイプ）から構成されている。The anchor body 18 is constructed by combining a freezing pipe 20 with a PC steel material 22, for example, an unbonded PC steel stranded wire 22-1, and the freezing pipe cools the surroundings by flowing a cooling liquid inside. It consists of a frozen hollow body (pipe).
【００１７】凍結管20の構成を詳しく述べると、図２に
示すように、凍結管20は内管20-1、外管20-2を持つ二重
管とされ、断熱材24を外管に裏打ちして凍結範囲を限定
している。つまり、断熱材24の配設されていない範囲
（L で示す範囲）が凍結範囲（アンカ−の定着長に該当
する。L'はアンカ−自由長を示す。）となる。The structure of the freezing pipe 20 will be described in detail. As shown in FIG. 2, the freezing pipe 20 is a double pipe having an inner pipe 20-1 and an outer pipe 20-2, and a heat insulating material 24 is used as an outer pipe. Lined to limit the freezing range. That is, the range in which the heat insulating material 24 is not provided (the range indicated by L) is the freezing range (corresponding to the anchor fixing length. L'indicates the anchor free length).
【００１８】図２に矢視するように、ブラインや低温液
化ガスのような冷却液が、凍結管の内管20-1に送られ内
管の先端を経て外管20-2内を流れ、流出口21から流出す
る。図示の凍結管20は一例であり、冷却液が内部を循環
して周囲を冷却する構成であれば足り、図示の構成に限
定されない。ここで、凍結装置（図示しない）を駆動さ
せることによって、凍結管20に冷却液が供給される。As shown in FIG. 2, a cooling liquid such as brine or low temperature liquefied gas is sent to the inner pipe 20-1 of the freezing pipe and flows in the outer pipe 20-2 through the tip of the inner pipe, It flows out from the outlet 21. The illustrated freezing tube 20 is an example, and the structure is not limited to the illustrated structure as long as the structure circulates a cooling liquid to cool the surroundings. Here, the cooling liquid is supplied to the freezing tube 20 by driving a freezing device (not shown).
【００１９】PC鋼材22が、凍結管20に沿って固定されて
おり、実施例では、凍結範囲において、スペ−サ−26を
適当に配設しPC鋼材を凍結管に固定している。A PC steel material 22 is fixed along the freezing pipe 20, and in the embodiment, a spacer 26 is appropriately arranged in the freezing range to fix the PC steel material to the freezing pipe.
【００２０】なお、図２の実施例では、PC鋼材22として
アンボンドPC鋼より線22-1を使用し除去式アンカ−とし
ているが、部分アンボンドPC鋼より線22-2（図３(A) の
実施例参照）、裸線のPC鋼より線22-3（図３(B) の実施
例参照）先端に圧着グリップ33を設け、先端キャップ34
で被覆する構成としてもよい。In the embodiment shown in FIG. 2, an unbonded PC stranded wire 22-1 is used as the PC steel material 22 to form a removal type anchor. However, a partial unbonded PC stranded wire 22-2 (FIG. No.), a bare PC stranded wire 22-3 (see the example in FIG. 3 (B)), a crimp grip 33 is provided at the tip, and a tip cap 34 is provided.
It may be configured to be covered with.
【００２１】図示のように、スペ−サ−26を介在してPC
鋼材22を凍結管20に固定すれば、PC鋼材22が凍結管20に
迅速に固定できる（図１(B) 参照）。As shown in the figure, a PC is interposed by a spacer 26.
By fixing the steel material 22 to the freezing pipe 20, the PC steel material 22 can be quickly fixed to the freezing pipe 20 (see FIG. 1 (B)).
【００２２】アンカ−孔14へのアンカ−幹体18の挿入の
前または後に、水または寒材がアンカ−孔14に注入され
る。Water or cryogen is injected into the anchor hole 14 either before or after insertion of the anchor trunk 18 into the anchor hole 14.
【００２３】それから、アンカ−孔14からドリルパイプ
16を引き抜き、凍結装置の電源を入れ、アンカ−幹体の
凍結管20に冷却液を流して、アンカ−孔内の水または寒
材とともに、アンカ−幹体の周囲の地盤を冷却、凍結す
る。地盤は、アンカ−幹体18を中心として同心円形状に
凍土化し相互に連結して凍土の耐力壁30を構築して強化
される（図１(C) 参照）。Then, from the anchor hole 14 to the drill pipe
16 is pulled out, the freezing device is turned on, and the cooling liquid is flown through the freezing pipe 20 of the anchor trunk to cool and freeze the ground around the anchor trunk together with the water or the cold material in the anchor hole. . The ground is reinforced by concentrating circularly around the anchor-trunk 18 into frozen soil and connecting them to each other to construct a bearing wall 30 for frozen soil (see FIG. 1 (C)).
【００２４】地盤の凍結後、アンカ−幹体のPC鋼材22
が、ジャッキ等で緊張され、クサビ等の定着具によって
台座31に定着される（図１(D) 参照）。After freezing the ground, anchor steel PC steel 22
However, it is tensioned by a jack or the like and fixed to the base 31 by a fixing tool such as a wedge (see FIG. 1D).
【００２５】この発明では、凍結管20に凍結液を供給し
てアンカ−孔14に存在する水または寒材を冷却、凍結し
て地盤を凍土化するため、水分を多量に含む軟弱地盤に
おいても、強固な凍土の耐力壁30がアンカ−孔14の回り
に構築でき、アンカ−が十分な耐力のもとで定着でき
る。また、軟弱地盤においても、アンカ−孔14に注入し
た水または寒材が周囲の地盤に浸透し凍結して強固な凍
土の耐力壁が構築されてアンカ−が定着できる。In the present invention, the freezing liquid is supplied to the freezing pipe 20 to cool or freeze the water or the cold material existing in the anchor holes 14 to freeze the ground, so that even in the soft ground containing a large amount of water. The strong frozen soil bearing wall 30 can be built around the anchor hole 14, and the anchor can be fixed under sufficient bearing strength. Further, even in soft ground, the water or cold material injected into the anchor holes 14 permeates into the surrounding ground and freezes to construct a strong frozen soil bearing wall to fix the anchor.
【００２６】アンカ−孔14の掘削のために供給される水
が周囲の地盤に浸透しても、この浸透水も冷却、凍結さ
れるため、凍土の耐力壁が構築でき、アンカ−の定着の
妨げとならない。Even if the water supplied for excavating the anchor hole 14 permeates into the surrounding ground, this permeated water is also cooled and frozen, so that a bearing wall for frozen soil can be constructed and anchorage can be fixed. Does not hinder.
【００２７】従来のアンカ−定着工法においてアンカ−
の定着の障害となる湧水等の水が、この発明では、冷
却、凍結して地盤の凍土化に役立ち、逆に積極的に利用
されている。そのため、アンカ−の定着が迅速、容易に
行える。In the conventional anchor fixing method, the anchor
According to the present invention, water such as spring water, which hinders the settlement of the soil, is cooled and frozen to help the frozen soil of the ground, and is used positively. Therefore, the anchor can be fixed quickly and easily.
【００２８】凍結範囲（定着長）L や供給する冷却液の
流量等を調整することによって、凍土化の範囲、凍土の
強度つまりはアンカ−引き抜き耐力が容易に調整でき
る。By adjusting the freezing range (fixing length) L and the flow rate of the cooling liquid to be supplied, the range of frozen soil, the strength of frozen soil, that is, the anchor pull-out proof strength can be easily adjusted.
【００２９】アンカ−幹体の凍結管20に冷却液を流し続
けて凍結状態を維持し、アンカ−の定着のもとで、所望
の工事が行われる。所望の工事が終わってアンカ−の使
用目的を達成した後、凍結装置の電源を切って凍結液の
供給を断てば、アンカ−幹体18の回りの凍土が解凍され
て、地盤が軟弱化される。そのため、アンカ−幹体18が
アンカ−孔14から容易に引き抜かれて、回収、除去でき
る。解凍を促進するために、凍結液の流路に温水等を流
してもよい。A desired work is performed under the anchoring of the anchor by keeping the frozen state by continuously flowing the cooling liquid to the freezing pipe 20 of the anchor trunk. After the desired construction is completed and the purpose of use of the anchor is achieved, if the power of the freezing device is turned off and the supply of the frozen liquid is cut off, the frozen soil around the anchor trunk 18 is thawed and the ground becomes weak. To be done. Therefore, the anchor trunk 18 can be easily pulled out from the anchor hole 14 and collected and removed. To accelerate the thawing, warm water or the like may be passed through the flow path of the frozen liquid.
【００３０】凍結を解除し地盤を軟弱化してから、アン
カ−（アンカ−幹体18）を除去しているため、アンカ−
の除去に必要な力（引張力）も従来に比較して格段に小
さくてすむ。そのため、小型重機のもとで、アンカ−が
迅速、容易に除去できる。Since the anchor (anchor trunk 18) is removed after freezing and softening the ground, the anchor
Also, the force (pulling force) required to remove the is much smaller than in the past. Therefore, the anchor can be quickly and easily removed under a small heavy machine.
【００３１】公知の除去式アンカ−では、コンクリ−ト
製等の耐荷体をアンカ−孔の底に配置しているため、ア
ンカ−の除去後もこの耐荷体がアンカ−孔に放置され
て、障害物になることもある。In the known removal type anchor, since a load-bearing member made of concrete or the like is arranged at the bottom of the anchor hole, the load-bearing member is left in the anchor hole even after the removal of the anchor. It may become an obstacle.
【００３２】これに対して、この発明では、凍結管20と
PC鋼材22とが一体化されてアンカ−（アンカ−幹体18）
となり、凍結解除によって、アンカ−が除去されるた
め、アンカ−孔14に残存するものはない。つまり、地中
に障害物を残すことなく、アンカ−（アンカ−幹体18）
が除去できる。On the other hand, in the present invention, the freezing tube 20 and
Anchor (anchor trunk 18) integrated with PC steel 22
Since the anchor is removed by freezing, nothing remains in the anchor hole 14. In other words, without leaving obstacles in the ground, anchor (anchor trunk 18)
Can be removed.
【００３３】アンカ−幹体18を回収して空隙となったア
ンカ−孔14にセメントミル等のグラウトを注入しアンカ
−孔を塞いで、アンカ−除去後の地盤の緩みを防止して
もよい。The anchor trunk body 18 may be recovered and a grout such as a cement mill may be injected into the anchor holes 14 that have become voids to close the anchor holes to prevent the ground from loosening after the anchor is removed. .
【００３４】アンカ−を除去しないという条件の下で
は、水または寒材の代わりに、セメントミル等のグラウ
トを、アンカ−幹体18の挿入の前後にアンカ−孔14に注
入してアンカ−幹体を固定することもできる。Under the condition that the anchor is not removed, grout of cement mill or the like is injected into the anchor hole 14 before and after the insertion of the anchor trunk body 18 instead of water or cold wood, and then the anchor trunk trunk is injected. You can also fix your body.
【００３５】上述した実施例は、この発明を説明するも
のであり、この発明を何ら限定するものでなく、この発
明の技術範囲内で変形、改造等の施されたものも全てこ
の発明に含まれることはいうまでもない。The above-described embodiments are intended to explain the present invention, and do not limit the present invention at all, and all modifications and alterations made within the technical scope of the present invention are also included in the present invention. It goes without saying that it will be done.
【００３６】[0036]
【発明の効果】上記のように、この発明の凍結アンカ−
工法によれば、水または寒材を冷却、凍結して地盤を凍
土化するため、軟弱な地盤においても、強固な凍土の耐
力壁が構築でき、アンカ−が十分な引き抜き耐力のもと
で定着できる。As described above, the frozen anchor of the present invention is used.
According to the construction method, water or cold material is cooled and frozen to freeze the ground, so that even on soft ground, a strong frozen soil bearing wall can be constructed and anchors are set up with sufficient pull-out strength. it can.
【００３７】また、アンカ−孔の掘削のために供給され
る水が周囲の地盤に浸透しても、この浸透水を冷却、凍
結することによって凍土の耐力壁が構築され、浸透水に
よる悪影響を受けない。Further, even if the water supplied for excavating the anchor hole permeates into the surrounding ground, by cooling and freezing the permeated water, a bearing wall of frozen soil is constructed, and the adverse effect of the permeated water is prevented. I do not receive it.
【００３８】湧水等の水が冷却、凍結して地盤を凍土化
しているため、品質が安定してアンカ−引き抜き耐力に
ばらつきがなく、アンカ−の定着が迅速、確実、容易に
行える。Since water such as spring water is cooled and frozen to freeze the ground, the quality is stable, the anchor pull-out proof strength does not vary, and the anchor can be fixed quickly, reliably and easily.
【００３９】凍結範囲や供給する冷却液の流量等を調整
することによって、アンカ−の引き抜き耐力が容易に調
整できる。By adjusting the freezing range and the flow rate of the supplied cooling liquid, the pulling-out proof strength of the anchor can be easily adjusted.
【００４０】アンカ−の使用目的を達成した後、凍結液
の供給を断てば、アンカ−幹体の回りの水または寒材が
解凍され、アンカ−の除去に必要な力（引張力）も従来
に比較して格段に小さくてすみ、小型重機のもとでも、
アンカ−が迅速、容易に除去できる。After the purpose of use of the anchor has been achieved, if the freezing liquid supply is cut off, the water or cold wood around the anchor trunk is thawed, and the force (tensile force) necessary for removing the anchor is also increased. It is much smaller than the conventional one, and even under small heavy machinery,
The anchor can be removed quickly and easily.
【００４１】凍結管とPC鋼材とが一体化されてアンカ−
（アンカ−幹体）となり、凍結解除によって、地中に障
害物を残すことなく、アンカ−が除去できる。The freeze tube and the PC steel material are integrated into the anchor.
It becomes (anchor trunk), and by freezing, the anchor can be removed without leaving obstacles in the ground.
【００４２】アンカ−幹体を回収して空隙となったアン
カ−孔にセメントミルク等のグラウトを注入してアンカ
−孔を塞げばアンカ−除去後の地盤の緩みを防止でき
る。If the anchor trunk is recovered and grout of cement milk or the like is injected into the anchor hole having a space to close the anchor hole, the looseness of the ground after the anchor removal can be prevented.
【００４３】PC鋼材、凍結管間にスペ−サ−を介在して
PC鋼材を固着すれば、PC鋼材を凍結管に確実、迅速に固
定できる。A spacer is interposed between the PC steel material and the freezing pipe.
By fixing the PC steel material, the PC steel material can be securely and quickly fixed to the freezing pipe.
【図１】この発明の凍結アンカ−工法の施工例を示す概
略図である。FIG. 1 is a schematic view showing a construction example of a frozen anchor construction method of the present invention.
【図２】(A) はPC鋼材、凍結管を組合せたアンカ−幹体
の一部破断の概略縦断面図、(B) は(A) の断面B に沿っ
たアンカ−幹体の横断面図である。[FIG. 2] (A) is a schematic vertical cross-sectional view of a partial fracture of an anchor trunk body combining PC steel and a freezing pipe, (B) is a transverse cross section of the anchor trunk body taken along section B of (A). It is a figure.
【図３】別実施例に係るアンカ−幹体の一部破断の概略
縦断面図である。FIG. 3 is a schematic vertical cross-sectional view of a partially broken anchor-trunk body according to another embodiment.
12 山留壁 14 アンカ−孔 16 ドリルパイプ 18 アンカ−幹体 20 凍結管 20-1、20-2 凍結管の内管、外管 22 PC鋼材 22-1 アンボンドPC鋼より線 22-2 部分アンボンドPC鋼より線 22-3 PC鋼より線 24 断熱材 26 スペ−サ− 30 （凍土の）耐力壁 31 台座 32 支圧板 33 圧着グリップ 34 先端キャップ L 凍結範囲（アンカ−の定着長） L' アンカ−の自由長 12 Yamadome wall 14 Anchor hole 16 Drill pipe 18 Anchor trunk 20 Freezing pipe 20-1, 20-2 Inner pipe and outer pipe of freezing pipe 22 PC steel material 22-1 Unbonded PC steel strand 22-2 Partial unbonded PC steel stranded wire 22-3 PC steel stranded wire 24 Insulation material 26 Spacer 30 (frozen soil) bearing wall 31 Pedestal 32 Pressure plate 33 Crimping grip 34 Tip cap L Freezing range (fixed length of anchor) L'Anchor -Free length
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平石 吾一 東京都千代田区神田神保町１丁目44番地 構造工事株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Goichi Hiraishi 1-44 Kanda Jinbocho, Chiyoda-ku, Tokyo Structural Construction Co., Ltd.
Claims (4)
却し凍結する中空の凍結管に沿って、PC鋼材を配設して
アンカ−幹体とし、 山留壁にアンカ−孔を掘削し、 ドリルパイプを残したアンカ−孔に、アンカ−幹体を挿
入するとともに水または寒材を注入し、 ドリルパイプを引き抜いた後、アンカ−幹体の凍結管に
冷却液を流して周囲の地盤を凍結し、 地盤の凍結後、アンカ−幹体のPC鋼材を緊張し定着させ
るとともに、凍結管に冷却液を流し続けて凍結状態を維
持する凍結アンカ−工法。1. A PC steel material is arranged along a hollow freezing pipe that cools and freezes the periphery by flowing a cooling liquid into an anchor trunk, and an anchor hole is excavated in a mountain retaining wall. , Insert the anchor trunk into the anchor hole that left the drill pipe, inject water or cold material, pull out the drill pipe, and then pour the cooling liquid into the freeze pipe of the anchor trunk to surround the ground. Freezing anchor construction method that freezes the ground, and after tensioning and fixing the PC steel material of the anchor trunk, keeps the cooling liquid flowing through the freezing pipe to maintain the frozen state.
却し凍結する中空の凍結管に沿って、PC鋼材を配設して
アンカ−幹体とし、 山留壁にアンカ−孔を掘削し、 ドリルパイプを残したアンカ−孔に、アンカ−幹体を挿
入するとともにセメントミル等のグラウトを注入し、 ドリルパイプを引き抜き、グラウトに必要強度が発現し
た後に、アンカ−幹体の凍結管に冷却液を流して周囲の
地盤を凍結し、 地盤の凍結後、アンカ−幹体のPC鋼材を緊張し定着させ
るとともに、凍結管に冷却液を流し続けて凍結状態を維
持する凍結アンカ−工法。2. A PC steel material is disposed along a hollow freezing pipe that cools and freezes the periphery by flowing a cooling liquid into an anchor trunk body, and an anchor hole is excavated in a mountain retaining wall. After inserting the anchor trunk into the anchor hole leaving the drill pipe and injecting grout such as cement mill, pulling out the drill pipe and developing the necessary strength in the grout, then to the freeze pipe of the anchor trunk A freezing anchor method in which the cooling liquid is flowed to freeze the surrounding ground, and after the ground is frozen, the PC steel material of the anchor trunk is tensioned and fixed, and the cooling liquid is continuously flowed to the freezing pipe to maintain the frozen state.
却し凍結する中空の凍結管に沿って、PC鋼材を配設して
アンカ−幹体とし、 山留壁にアンカ−孔を掘削し、 ドリルパイプを残したアンカ−孔に、アンカ−幹体を挿
入するとともに水または寒材を注入し、 ドリルパイプを引き抜いた後、アンカ−幹体の凍結管に
冷却液を流して周囲の地盤を凍結し、 地盤の凍結後、アンカ−幹体のPC鋼材を緊張し定着させ
るとともに、凍結管に冷却液を流し続けて凍結状態を維
持し、 冷却液の供給を断ち地盤を解凍して、アンカ−幹体を引
き抜き、回収し、 空隙となったアンカ−孔にグラウトを注入して塞いだ凍
結アンカ−工法。3. An anchor trunk is formed by arranging a PC steel material along a hollow freezing pipe that cools and freezes the periphery by flowing a cooling liquid inside, and an anchor hole is excavated in a mountain retaining wall. , Insert the anchor trunk into the anchor hole that left the drill pipe, inject water or cold material, pull out the drill pipe, and then pour the cooling liquid into the freeze pipe of the anchor trunk to surround the ground. After freezing the ground, after tensioning and fixing the PC steel material of the anchor-trunk body, the cooling liquid is kept flowing through the freezing pipe to maintain the frozen state, the supply of the cooling liquid is cut off, and the ground is thawed. Freezing anchor construction method in which the trunk of the anchor was pulled out and collected, and grout was injected into the hollow anchor hole to close it.
させてPC鋼材を凍結管に固定した請求項１ないし３のい
ずれか記載の凍結アンカ−工法。4. The freezing anchor construction method according to claim 1, wherein the PC steel material is fixed to the freezing pipe by interposing a spacer between the freezing pipe and the PC steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23080793A JPH0762651A (en) | 1993-08-25 | 1993-08-25 | Frozen anchor construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23080793A JPH0762651A (en) | 1993-08-25 | 1993-08-25 | Frozen anchor construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0762651A true JPH0762651A (en) | 1995-03-07 |
Family
ID=16913588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23080793A Pending JPH0762651A (en) | 1993-08-25 | 1993-08-25 | Frozen anchor construction method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0762651A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015031118A (en) * | 2013-08-06 | 2015-02-16 | 積水化学工業株式会社 | Fixation structure of tension member and tensile force transmission member, ground anchor, and tendon grip |
| CN108361038A (en) * | 2018-04-17 | 2018-08-03 | 中国矿业大学(北京) | A kind of energy saving frigo of New Inclined |
| CN108797603A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of protection network and liquid nitrogen frozen soil wall composite supporting construction and its construction method |
| CN108797602A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of piled anchor and liquid nitrogen frozen soil wall composite supporting construction and its construction method |
| CN108797606A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of construction method of protection network and liquid nitrogen frozen soil wall composite support system |
| CN108797601A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of construction method of piled anchor and liquid nitrogen frozen soil wall composite support system |
| CN108797605A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of the piled anchor formula composite supporting construction and its construction method of combination liquid nitrogen frozen soil wall |
| CN108915699A (en) * | 2018-09-10 | 2018-11-30 | 陈朝晖 | A kind of ejector sleeve mechanism |
| CN115262526A (en) * | 2022-09-05 | 2022-11-01 | 上海建工集团股份有限公司 | Artificial stratum freezing device and method with adjustable freezing position |
-
1993
- 1993-08-25 JP JP23080793A patent/JPH0762651A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015031118A (en) * | 2013-08-06 | 2015-02-16 | 積水化学工業株式会社 | Fixation structure of tension member and tensile force transmission member, ground anchor, and tendon grip |
| CN108361038A (en) * | 2018-04-17 | 2018-08-03 | 中国矿业大学(北京) | A kind of energy saving frigo of New Inclined |
| CN108797603A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of protection network and liquid nitrogen frozen soil wall composite supporting construction and its construction method |
| CN108797602A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of piled anchor and liquid nitrogen frozen soil wall composite supporting construction and its construction method |
| CN108797606A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of construction method of protection network and liquid nitrogen frozen soil wall composite support system |
| CN108797601A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of construction method of piled anchor and liquid nitrogen frozen soil wall composite support system |
| CN108797605A (en) * | 2018-06-13 | 2018-11-13 | 王海霖 | A kind of the piled anchor formula composite supporting construction and its construction method of combination liquid nitrogen frozen soil wall |
| CN108915699A (en) * | 2018-09-10 | 2018-11-30 | 陈朝晖 | A kind of ejector sleeve mechanism |
| CN115262526A (en) * | 2022-09-05 | 2022-11-01 | 上海建工集团股份有限公司 | Artificial stratum freezing device and method with adjustable freezing position |
| CN115262526B (en) * | 2022-09-05 | 2023-08-22 | 上海建工集团股份有限公司 | Artificial stratum freezing device and method with adjustable freezing position |
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