JP2002105955A - Ground anchor - Google Patents
Ground anchorInfo
- Publication number
- JP2002105955A JP2002105955A JP2000294754A JP2000294754A JP2002105955A JP 2002105955 A JP2002105955 A JP 2002105955A JP 2000294754 A JP2000294754 A JP 2000294754A JP 2000294754 A JP2000294754 A JP 2000294754A JP 2002105955 A JP2002105955 A JP 2002105955A
- Authority
- JP
- Japan
- Prior art keywords
- anchor
- tension member
- ground
- injection
- steel
- 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
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明はアンボンドタイプの
引張材を貫通させた、支圧ロッドと鉄筋篭を取付けた耐
荷体をその先端部の固定台座を介して、アンボンドタイ
プの引張材に緊張力を伝達するグラウンドアンカーに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load-bearing body having a supporting rod and a reinforcing bar cage, which has an unbonded tension member penetrated therein, and which is tensioned to the unbonded tension member via a fixing pedestal at the tip end thereof. This is related to the ground anchor transmitting the signal.
【0002】また、アンボンドタイプのPC鋼材(PC
鋼線、PC鋼棒、PC鋼より線)を防食する目的とアン
カー体を定着させるためのグラウト注入管としての役目
をもつシースパイプ内部をアンカーテンドンの捻れを防
止すると共に、注入効率を高めるために星形注入スペー
サー又はストランドセンタライザーを使用したグラウト
注入法に関するものである。In addition, unbonded type PC steel (PC steel)
Steel wire, PC steel rod, PC steel stranded wire) To prevent corrosion of the uncurtain don and increase the injection efficiency inside the sheath pipe, which serves as a grout injection pipe for anchoring the anchor body and for preventing corrosion of the anchor rod And a grout injection method using a star injection spacer or a strand centerizer.
【0003】さらに、地すべりや斜面災害を防止又は復
旧するために、確実性が高く且つ経済性が望まれる社会
的要請に応えるグラウンドアンカー工法で、地表部で予
測できない複雑な地中の地質条件の変化にも対応できる
ため、災害関連事業での活用範囲が拡大される。Further, in order to prevent or recover from landslides and slope disasters, a ground anchor method that meets social demands that are highly reliable and economical is required. Because it can respond to changes, the range of use in disaster-related businesses is expanded.
【0004】[0004]
【従来の技術】アンカー体の定着対象地盤を、岩盤、砂
層、礫層、ローム層、土丹層等にとり、アンカーケーブ
ルに上記のPC鋼材を使用し、緊張力を与えて構造物に
定着するものを、グラウンドアンカー工法と呼んでお
り、すべり防止,傾斜地崩壊防止、擁壁・土留転倒防
止、地中構造物の浮き上がり防止等の構造物を安定させ
るアンカーとして用いられる。2. Description of the Related Art An anchor body is fixed to a rock, sand layer, gravel layer, loam layer, earthen layer, etc., and the above-mentioned PC steel material is used as an anchor cable, and the anchor cable is fixed to a structure by applying tension. This is called the ground anchor method, and is used as an anchor to stabilize structures such as preventing slippage, preventing landslides from collapsing, preventing retaining walls and retaining soil from falling, and preventing underground structures from lifting.
【0005】そして、一般的なアンカー体の対象地盤へ
の定着にはセメントミルク等のグラウト材を注入し、孔
壁及びアンカー体に付着させ、その周辺摩擦抵抗力によ
り支持される。この他に、定着・支持機構としては、定
着対象地盤での拡孔支圧型や先端圧縮型があり、出願人
が先に提供した技術では、周辺摩擦抵抗及び先端圧縮力
を併用した定着機構を持つものである。[0005] In order to fix the general anchor body to the target ground, grout material such as cement milk is injected, adhered to the hole wall and the anchor body, and supported by the peripheral frictional resistance. In addition, as the fixing / supporting mechanism, there are a pressure-supplying type and a tip-compression type on the ground to be fixed, and the technology previously provided by the applicant employs a fixing mechanism using both the peripheral frictional resistance and the tip-compressing force. Have.
【0006】上記アンカーの定着方法は、例えば図8に
示すように、アンボンドタイプ等の引張材(a)の端部に
支圧板(b)を取付け、これを地中に掘削したアンカー孔
(c)内に挿入し、そのアンカー孔の孔奥部の定着長部
に、アンカーグラウト(セメントミルク・モルタル等)
の硬化材を充填した後、硬化材の硬化を待って、自由長
部に緊張力を与えて定着するものである。この定着方法
では,引張材(a)を緊張する際に、その引張材(a)に引抜
き力が作用するため、アンカー躯体(d)がアンカー軸方
向に圧縮されると同時に、アンカー孔(c)を拡径する方
向に膨張する。従って、アンカー躯体(d)にクラック
(e)が発生する恐れがあり、アンカー耐力が低下すると
同時に、地下水等の浸入により引張材(a)が腐食する原
因となる。The anchor anchoring method is, for example, as shown in FIG. 8, in which an anchoring plate (b) is attached to an end of a tensile member (a) of an unbond type or the like, and this is excavated in the ground.
(c) Insert the anchor grout (cement milk, mortar, etc.) into the anchoring length at the back of the anchor hole.
After the hardening material is filled, the hardening material is waited for hardening and a tension is applied to the free length portion to fix the free length portion. In this fixing method, when the tension member (a) is tensioned, a pulling force acts on the tension member (a), so that the anchor frame (d) is compressed in the anchor axis direction and the anchor hole (c) ) Expands in the direction to expand the diameter. Therefore, cracks occur in the anchor frame (d).
(e) may occur, and at the same time, the anchor proof strength is reduced, and at the same time, the tensile material (a) is corroded by intrusion of groundwater or the like.
【0007】そこで、本願出願人等は先に特許第212024
0号に係るグラウンドアンカーに鉄筋籠等を設けること
によって上記課題の解決を図った。当該特許の概要は次
の通りである。地すべりや崩壊危険斜面の防災工事、構
造物の安定等のため、安定側地盤にアンカーを定着し、
PC鋼線などの引張材を介して緊張する工法をグラウン
ドアンカー工法と呼んでいる。アンカーの定着について
は、アンカー体とセメントミルク等のグラウト材との摩
擦抵抗及びグラウト材とボーリング等で削孔した安定側
地盤の孔壁との摩擦抵抗が、期待する引張材(アンカー
テンドン)の緊張力より大きければよいとするものであ
る。Therefore, the applicant of the present application has previously filed Patent No. 212024.
The above-mentioned problem was solved by providing a steel cage or the like on the ground anchor according to No. 0. The outline of the patent is as follows. Anchors were anchored on the stable ground for disaster prevention work on landslides and collapse danger slopes, and for structural stability.
The method of tensioning through a tensile material such as a PC steel wire is called a ground anchor method. Regarding anchor anchoring, the frictional resistance between the anchor body and the grout material such as cement milk and the frictional resistance between the grout material and the hole wall of the stable side ground drilled by boring, etc., depend on the expected tensile material (uncurtain don). It is only necessary to be larger than the tension.
【0008】アンカーを緊張するとアンカー体が軸方向
に圧縮され、また孔壁方向に膨張する力が働く。このと
きグラウト材にクラックが発生するおそれがあり、アン
カー体の耐力が低下することになる。[0008] When the anchor is tensioned, the anchor body is compressed in the axial direction, and a force acts to expand in the hole wall direction. At this time, cracks may occur in the grout material, and the proof stress of the anchor body is reduced.
【0009】このようなクラックの発生を防止するため
に、アンカーテンドンの軸方向に位置させた横筋とアン
カーテンドンの周方向に位置させたスパイラル筋とによ
る鉄筋篭をアンカー体に取付け、鉄筋コンクリート状に
グラウト材を強化したもので、アンボンドタイプの引張
材の一端に取付けた支圧板を介して応力が伝達される。In order to prevent the occurrence of such cracks, a reinforcing bar made of a horizontal streak positioned in the axial direction of the uncurtain don and a spiral streak positioned in the circumferential direction of the uncurtain don is attached to the anchor body to form a reinforced concrete shape. The grout material is reinforced, and the stress is transmitted through a support plate attached to one end of an unbonded tensile material.
【0010】このことは、アンカー先端に集中する荷重
を上部にも分散することができるため、きわめて安定し
た定着が得られる。使用する鋼材等にはポリエチレン管
・防水シール・グラウト材等の防食材により2重以上に
防錆することで、永久アンカーとして優れた性能を発揮
することができた。[0010] This means that the load concentrated on the tip of the anchor can be dispersed also to the upper part, so that extremely stable fixing can be obtained. Excellent performance as a permanent anchor could be exhibited by using a steel material or the like to be rust-proofed more than twice with a corrosion-resistant material such as a polyethylene pipe, a waterproof seal, and a grout material.
【0011】[0011]
【発明が解決しようとする課題】上記アンカーの定着方
法では、PC鋼材群を緊張する際に、PC鋼材群に引抜
き力が作用するため、アンカー躯体がアンカー軸方向に
圧縮されると同時に,アンカー孔を拡径する方向に膨張
する。従って,アンカー躯体にクラックが発生する恐れ
があり、アンカー耐力が低下すると同時に、地下水等の
浸入によりPC鋼材群が腐食する原因となっている。In the anchor fixing method described above, when the PC steel group is tensioned, a pulling force acts on the PC steel group, so that the anchor body is compressed in the anchor axial direction and at the same time, the anchor body is compressed. The hole expands in a direction to expand the diameter. Therefore, cracks may be generated in the anchor frame, which lowers the anchor strength and causes corrosion of the PC steel group due to intrusion of groundwater or the like.
【0012】しかし、上記の特許にあっても地中構造物
であるアンカーは定着地盤の地盤強度等が複雑な地質・
水文条件によって変化することが多く、定着位置での孔
壁の地盤強度が弱すぎたり、地下水の流動により注入グ
ラウト材が流されたり,薄められて所定の強度を得られ
ず、アンカー体が座屈したり、抜け出すことがある。ま
た、地質・水文条件の変化を正しく判定することは、地
質調査費用が膨大になり現実的でなくなる。However, even in the above-mentioned patent, the anchor which is an underground structure has a geological feature in which the ground strength of the anchored ground is complicated.
It often changes depending on the hydrological conditions, the ground strength of the hole wall at the anchoring position is too weak, the grout injected by the groundwater flows, or the grout is thinned and the predetermined strength is not obtained, and the anchor body is seated. May succumb or slip out. Also, judging changes in geological and hydrological conditions correctly makes the geological survey costs enormous and impractical.
【0013】このため、定着位置での孔壁の地盤強度の
強弱によっては、アンカー体が受ける応力をアンカー体
上部方向に分散して、孔壁周面の摩擦抵抗力として受け
れば、孔壁が歪んでアンカー体が抜け出すことや孔壁が
破壊してアンカー体が座屈することが防げる。For this reason, depending on the strength of the ground strength of the hole wall at the fixing position, if the stress received by the anchor body is dispersed in the upper direction of the anchor body and received as the frictional resistance of the peripheral surface of the hole wall, the hole wall may be distorted. It is possible to prevent the anchor body from coming out and the hole wall from breaking and the anchor body from buckling.
【0014】また、アンカー体定着のための注入グラウ
ト材については、孔内水をグラウト材に置き換えるだけ
の場合や細い注入管で極く少量づつグラウト材を注入す
る方法が一般的であるが、定着地盤付近でグラウト材が
地下水などで稀釈されないで目的の位置に充填できるた
めには,注入管内のグラウト材がスムーズに流れるよう
に工夫、注入目的位置に確実にグラウト材を充填できる
ことが望まれる。[0014] As for the grouting material for fixing the anchor body, it is common to simply replace the water in the hole with the grouting material or to inject the grouting material little by little with a thin filling pipe. In order to be able to fill the grout material at the target position near the anchoring ground without being diluted by groundwater, it is desirable that the grout material in the injection pipe be designed to flow smoothly and that the grout material be reliably filled at the injection target position. .
【0015】[0015]
【課題を解決するための手段】そこで、従来の課題を解
決し且つ発明の目的を達成するために提供するものであ
る。地中に掘削したアンカー孔の孔奥部に定着する定着
長部と、緊張力を与える自由長部とよりなるアンカーに
おいて、定着長部にあたるアンボンドタイプのPC鋼材
より成る引張材の一部又は全部の周囲に、アンカーテン
ドンの軸方向に位置させた横筋とアンカーテンドンの周
方向に位置させた拘束筋とよりなる鉄筋篭を、引張材の
先端を圧着加工したグリップを介して固定金具台座に接
続したたことを特徴とするグラウンドアンカーである。SUMMARY OF THE INVENTION The present invention is provided to solve the conventional problems and to achieve the object of the invention. Part of or all of the tensile material made of unbonded PC steel material corresponding to the anchoring length in the anchor consisting of the anchoring length fixed to the inner part of the anchor hole excavated in the ground and the free length applying tension. Around the shaft, a reinforcing bar cage consisting of a horizontal bar located in the axial direction of the uncurtain don and a restraining bar located in the circumferential direction of the uncurtain don is connected to the fixing bracket pedestal via a grip with the tip of the tensile material crimped It is a ground anchor characterized by doing.
【0016】定着地盤の地盤強度の強弱によるアンカー
体の座屈や引き抜けを防止するため,さらに、通常アン
カー孔の孔壁方向への応力が集中する、アンカー体先端
部(固定台座、固定金具)を鋼材により強化し、孔壁が
弱くてもアンカー体が座屈しない構造としてある。In order to prevent the anchor body from buckling or pulling out due to the strength of the ground strength of the anchoring ground, the anchor body tip portion (fixing pedestal, fixing bracket) where stress is usually concentrated in the direction of the hole wall of the anchor hole. ) Is strengthened by steel material so that the anchor body does not buckle even if the hole wall is weak.
【0017】このことで、定着部孔壁の強度が弱い場合
は、アンカー体上部方向に緊張応力が分担伝達されるこ
ととなるので,鋼管等を加工して周辺摩擦抵抗力を向上
させた支圧ロッドの強度を十分に確保した固定金具部に
連結し、上記の鉄筋籠で取り囲む構造としたことで、摩
擦型アンカーの効果が加わりグラウト材の圧縮破壊が防
止され、定着地盤の複雑な地質変化に遭遇しても目的の
アンカー緊張力が得られ、長期にわたり維持することが
できるグラウンドアンカーとなっている。[0017] When the strength of the fixing portion hole wall is low, the tensile stress is transmitted in the upward direction of the anchor body, so that the steel pipe or the like is processed to improve the peripheral friction resistance. Combined with the metal fittings that ensure sufficient strength of the pressure rod and surrounded by the above-mentioned reinforcing cage, the effect of the friction type anchor is added to prevent the grout material from compressive destruction, and the complex geology of the anchored ground Even if a change is encountered, the desired anchor tension is obtained, and the ground anchor can be maintained for a long time.
【0018】アンカー体定着のためのグラウト材の注入
方法として、アンボンドタイプのPC鋼材からなる引張
材(アンカーテンドン)を防食する目的でもあるポリエ
チレンパイプ等によるシースパイプを注入管とすること
は、注入管の管内断面積を大きくすることができて注入
効率が高まり、孔内水の流動等による定着位置でのグラ
ウト材の稀釈等によるグラウト材の強度低下が防げる。
しかし、複数の引張材がシース内で捻れたり、交叉した
りすれば,グラウト材の流動に渦ができたり、流速が乱
れて閉塞するなどの障害を起こす懸念がある。As a method for injecting the grout material for fixing the anchor body, it is necessary to use a sheath pipe made of a polyethylene pipe or the like, which is also for the purpose of preventing corrosion of the tensile material (uncurtain don) made of unbonded PC steel. It is possible to increase the cross-sectional area of the inside of the tube, thereby increasing the injection efficiency, and to prevent the grout material from decreasing in strength due to dilution of the grout material at the fixing position due to the flow of water in the hole.
However, if a plurality of tensile members are twisted or crossed within the sheath, there is a concern that the flow of the grout material may be swirled, or the flow speed may be disturbed and blockage may occur.
【0019】星形注入スペーサーを複数の引張材を必要
間隔で均等に挟み込むことにより、実際の注入断面は均
等な柱状に連続した星形断面を形成し、グラウト材流動
の障害がなく、グラウト材注入の目的が達成される。引
張材が単線の場合はアンカーテンドンをストランドセン
タライザーによりシースパイプの中央に保持すること
で、同様に注入断面が安定しグラウト材の流速を変化さ
せる障害がなくなり安定した注入がなされる。By interposing the star-shaped injection spacer with a plurality of tension members evenly at necessary intervals, the actual injection section forms a star-shaped section continuous in a uniform columnar shape, and there is no obstruction in the flow of the grout material. The purpose of the injection is achieved. When the tension material is a single wire, by holding the uncurtain-don at the center of the sheath pipe by the strand centerizer, the injection cross section is similarly stabilized, and there is no obstacle to change the flow rate of the grout material, so that stable injection is performed.
【0020】不確実性が問われる、孔内水置換型のグラ
ウト充填方法(通称:どぶ付け)や、小孔径の注入管に
よる低速注入などでは、定着地盤付近の地下水流動等に
よりグラウト材が稀釈され、所要のグラウト強度が得ら
れない不安があったが本発明により解決された。そし
て、本発明により、定着地盤の複雑な地質・水分条件に
出会っても、確実にアンカー体を定着し、所要の緊張力
を長期にわたり維持することができる。In the grout filling method of the water displacement in the hole (commonly referred to as "doughing") or the low-speed injection with a small-diameter injection pipe, where the uncertainty is required, the grout material is diluted by groundwater flow near the fixing ground. However, there was a concern that the required grout strength could not be obtained, but this has been solved by the present invention. Further, according to the present invention, even when a complicated geological and moisture condition of the anchoring ground is encountered, the anchor body can be reliably anchored, and the required tension can be maintained for a long time.
【0021】[0021]
【実施例】1は固定金具であり、当該固定金具は鋼製の
筒体であり,外周面には中間部から両端部にかけて逆方
向にネジを刻設してある。2は下部の支圧プレートであ
り、固定金具1にネジで連結され、その固定金具から耐
荷体(支圧ロッド、鉄筋篭)への分担荷重を伝達するた
めに、支圧ロッド3とネジで連結され、その外周に取付
ける鉄筋篭を上部の支圧プレート9との間に挟み込んで
固定する。上部の支圧プレート9はアンボンドタイプの
引張材を防食し、注入パイプとなるポリエチレン等の素
材により、アンカー自由長部の周囲に配置するシースパ
イプを接続固定する。前記上下の支圧プレート2・9
は、この前面で定着部の剛性が小さくなることを利用し
て、圧縮力による半径方向への変位を得て、効果的に定
着地盤へ荷重が伝達される。上下の支圧プレート2・9
間(支圧ロッド3、鉄筋篭が挟み込まれる。)を耐荷体
と称する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference numeral 1 denotes a fixing bracket, which is a steel tubular body, and has a thread formed in the outer peripheral surface in a reverse direction from an intermediate portion to both end portions. Reference numeral 2 denotes a lower supporting plate, which is connected to the fixing bracket 1 with a screw, and transmits a sharing load from the fixing metal to the load-bearing body (bearing rod, reinforced cage) by using a supporting rod 3 and a screw. The steel cage connected and attached to the outer periphery of the cage is sandwiched and fixed between the bearing plate 9 and the upper support plate 9. The upper bearing plate 9 protects the unbonded tensile material from corrosion, and connects and fixes a sheath pipe disposed around the free length of the anchor using a material such as polyethylene as an injection pipe. The upper and lower bearing plates 2.9
Utilizing the fact that the rigidity of the fixing portion is reduced at the front surface, the load is effectively transmitted to the fixing ground by obtaining the displacement in the radial direction due to the compressive force. Upper and lower bearing plates 2.9
The space between the supporting rod 3 and the reinforcing rod cage is referred to as a load-bearing body.
【0022】3は支圧ロッドであり、固定金具1の上部
にアンカーの所要引き抜き力に十分抵抗できる材質及び
断面積を有するものとする。前記の支圧ロッド3は鋼管
表面に細かな凹凸を設け,グラウト材との付着力を増強
してある。そして、この支圧ロッドを取り囲むように鉄
筋篭が上部の支圧プレート2と下部の支圧プレート9の
間に挟み込まれて固定されている。Reference numeral 3 denotes a bearing rod, which has a material and a cross-sectional area at the upper part of the fixing bracket 1 which can sufficiently resist a required pulling force of the anchor. The supporting rod 3 has fine irregularities on the surface of the steel pipe to enhance the adhesion to the grout material. A reinforcing bar is sandwiched and fixed between the upper supporting plate 2 and the lower supporting plate 9 so as to surround the supporting rod.
【0023】4はボトムカバー、5は圧着グリップ、6
は固定金具の周面に設けた突起、7はグラウト材の排出
孔、8は圧着グリップ5を固定するための貫通孔付き固
定台座を示す。4 is a bottom cover, 5 is a pressure grip, 6
Denotes a protrusion provided on the peripheral surface of the fixing bracket, 7 denotes a grout material discharge hole, and 8 denotes a fixing pedestal with a through hole for fixing the crimping grip 5.
【0024】10は鉄筋篭であり、複数の細径横筋をP
C鋼材群の長手方向に位置させ、それらの外周囲に細径
のスパイラル筋のように拘束筋を巻き付けて一体化した
ものである。なお、拘束筋はスパイラル筋の代わりに、
複数の独立したリング筋や四角形、八角形、楕円形等の
補強材を取付けてもよい。また、前記鉄筋の代わりにカ
ーボンファイバーやグラスファイバー等の耐腐食性材料
を使用して、篭体を形成することもできる。Reference numeral 10 denotes a reinforcing bar cage, which has a plurality of narrow transverse bars P
It is located in the longitudinal direction of the C steel material group, and is wound around the outer periphery thereof with a restraining bar like a fine spiral bar to be integrated. In addition, instead of spiral muscles,
A plurality of independent ring streaks and reinforcing members such as square, octagonal, and elliptical shapes may be attached. Further, the cage can be formed by using a corrosion-resistant material such as carbon fiber or glass fiber instead of the reinforcing bar.
【0025】11はアンボンドPC鋼より線から成る引
張材であり、端部を固定台座8の貫通孔に貫通させて圧
着グリップ5を圧着し、固定台座で引張力を受ける。1
2は星形の注入スペーサーであり、アンボンドタイプの
引張材11(アンカーテンドン)を覆う防食及び注入用
シースパイプ13の注入効率を安定させる星形柱状断面
を確保すると共に、複数の引張材11のシース内捻れを
防止するために、アンボンドタイプの引張材11を均等
に拘束するための鋼材又はその他の素材によるものであ
り、アンカーテンドン組立時に適宜間隔で複数のアンボ
ンドタイプの引張材11で挟み込んで設置する。Reference numeral 11 denotes a tensile member made of unbonded PC steel wire, the end of which is penetrated through the through hole of the fixing base 8 to press the crimping grip 5, and receives a tensile force on the fixing base. 1
Reference numeral 2 denotes a star-shaped injection spacer which secures a star-shaped columnar cross-section for stabilizing the injection efficiency of the sheath pipe 13 for corrosion protection and injection for covering the unbonded tension member 11 (uncurtain don), and a plurality of tension members 11. It is made of steel or other material for uniformly restraining the unbonded tension member 11 in order to prevent twisting in the sheath. The unbonded tension member 11 is sandwiched between a plurality of unbonded tension members 11 at appropriate intervals during assembly of the uncurtain don. Install.
【0026】14はストランドセンタライザーであり、
単線のアンボンドタイプの引張材11を使用する場合
は、注入用シースパイプ13の中心に位置させ、注入効
率を安定させ、引張材11の捻れを防止するPC鋼材又
はその他の素材による中空三角柱型等の構造になってい
る。14 is a strand centerizer,
When using a single wire unbonded tensile material 11, it is positioned at the center of the sheath pipe 13 for injection, and is made of a hollow steel triangular prism made of PC steel or another material that stabilizes the injection efficiency and prevents the tensile material 11 from being twisted. It has the structure of
【0027】[0027]
【施工例】本発明は、固定金具1と耐荷体内の支圧ロッ
ド3が荷重伝達軸となって、グラウト材に対してこの外
周面の付着と、耐荷体に設けた上下の支圧プレート2・
9による支圧によって荷重伝達される複合構造となって
いる。固定金具1と支圧ロッド3は、定着時の軸力分布
に対して十分な圧縮強度を備え、軟岩など地盤Gの強度
が小さい場合にも周辺摩擦抵抗を広く確保するために、
孔軸方向へ十分な荷重伝達ができるようになっている。
また、上下の支圧プレート2・9は、この前面で定着部
の剛性が小さくなることを利用して、圧縮力による半径
方向への変位を得て、効果的に地盤へ荷重が伝達され
る。さらに、半径方向への圧縮変形によるグラウト材の
割裂破壊を防ぐため、支圧プレート前面のグラウト材は
鉄筋篭10で補強され、グラウト材強度と、靱性(ねば
り強さ)が高まる。アンカー体はこうした複合形状の採
用により、上下の支圧プレート2・9の前面は十分な被
りが確保され、グラウト材の回り込みや充填性が優れる
ほか、アンカー体挿入中の泥やグリス等の付着による影
響も、確実に引き抜き抵抗を得ることになる。アンカー
テンドンを覆い防錆保護するシースパイプ13を注入管
とするために、星形注入スペーサー12やストランドセ
ンタライザー14を適宜間隔でシースパイプ内に設置す
ることにより、グラウト材注入作業が簡便になると共
に、グラウト材の確実な充填が行えることになる。ま
た、シースパイプ13に覆われる複数のPC鋼材等のア
ンカーテンドンはシースパイプ内で捻れや交叉すること
が無くなるため、個々のアンボンドPC鋼より線から成
る引張材11の緊張時における片効き等が防止され、設
計どおりのアンカー引張力が設定される。[Working example] In the present invention, the fixing bracket 1 and the supporting rod 3 in the load-bearing body serve as a load transmitting shaft, and the outer peripheral surface is attached to the grout material and the upper and lower supporting plates 2 provided on the load-bearing body.・
9 has a composite structure in which the load is transmitted by the bearing force. The fixing bracket 1 and the bearing rod 3 have sufficient compressive strength against the axial force distribution at the time of fixing, and in order to secure a wide peripheral frictional resistance even when the strength of the ground G such as soft rock is small.
A sufficient load can be transmitted in the hole axis direction.
The upper and lower bearing plates 2 and 9 use the fact that the rigidity of the fixing portion is reduced at the front surface to obtain displacement in the radial direction due to the compressive force, and the load is effectively transmitted to the ground. . Furthermore, in order to prevent the splitting fracture of the grout material due to radial compression deformation, the grout material on the front surface of the bearing plate is reinforced by the reinforcing cage 10 to increase the grout material strength and toughness (stickiness). By adopting such a composite shape of the anchor body, the front surfaces of the upper and lower bearing plates 2 and 9 are sufficiently covered, so that the grout material can be easily wrapped and filled, as well as adhesion of mud and grease during insertion of the anchor body. The effect of this also ensures that the pullout resistance is obtained. The grout material injection work is simplified by disposing the star-shaped injection spacer 12 and the strand centerizer 14 at appropriate intervals in the sheath pipe in order to use the sheath pipe 13 that covers the uncurtainer and protects against rust as an injection pipe. At the same time, the grout material can be reliably filled. Further, since the uncurtain don of the plurality of PC steel materials covered with the sheath pipe 13 is prevented from being twisted or crossed in the sheath pipe, the single effect at the time of tension of the tensile material 11 composed of the individual unbonded PC steel strands is reduced. It is prevented and the anchor tension as designed is set.
【0028】[0028]
【発明の効果】本発明は以上の構成であるから、次のよ
うな効果が得られる。 (1) グラウンドアンカーは定着部先端に圧縮力を作用
させて、荷重を地盤に伝達する構造であり、グラウト材
の圧縮強度が引張強度に対して極めて大きい特性を利用
して、引張り亀裂の移転による進行性破壊の危険性を回
避している。 (2) 固定金具台座は定着地盤の強度が小さくても大き
な変位や座屈を生じず、上部の耐荷体方向に応力を分散
し、耐荷体とグラウト材が一体となって定着地盤(アン
カー孔壁)との周辺摩擦抵抗力により、所要のアンカー
引張力が得られるため、広範囲な定着地盤条件に対応で
きるアンカーである。 (3) 通常のアンカーでは、予測できない強度の小さい
定着地盤に遭遇した場合、弱い地盤を圧縮し過ぎて、ア
ンカー体自体の座屈破壊やアンカー体の引き抜けなどを
起こし、再施工や工法の変更が強いられることがあり、
工事費の増大となり事業の継続に支障を生じることとな
る。 (4) シースパイプを注入管とし,固定金具下部のグラ
ウト排出孔よりグラウト材を排出し、孔内及びアンカー
体外部にくまなく充填されるため、アンカー体がスライ
ムや挿入時の削り泥などの中に設置されグラウト材の充
填が不十分になるなどが防げる。 (5) シースパイプ内に設置する星形注入スペーサーに
より、複数の引張材のシース内捻れを防止したため、引
張材緊張時の片効きの不安がなくなる。この片効きは個
々の引張材の一部に緊張力が集中しアンカー設計荷重よ
り小さい緊張力でも破断する等の危険性があるが、これ
が除去されるのである。As described above, the present invention has the following advantages. (1) The ground anchor is a structure that transmits a load to the ground by applying a compressive force to the tip of the anchoring part, and utilizes the property that the compressive strength of the grout material is extremely large compared to the tensile strength to transfer the tensile crack. Avoids the risk of progressive destruction. (2) The fixing bracket pedestal does not cause large displacement or buckling even if the strength of the anchoring ground is low, disperses stress in the direction of the load-bearing body at the top, and integrates the load-bearing body and grout material into the anchoring ground (anchor hole). The required anchor tensile force can be obtained by the peripheral frictional resistance with the wall), so that the anchor can cope with a wide range of anchoring ground conditions. (3) When a normal anchor encounters a fixed ground with a small strength that cannot be predicted, it compresses the weak ground too much, causing buckling failure of the anchor itself and pulling out of the anchor, etc. Changes may be forced,
The construction cost will increase, which will hinder the continuation of the business. (4) The sheath pipe is used as an injection pipe, and the grout is discharged from the grout discharge hole at the bottom of the fixture and filled all over the hole and the outside of the anchor body. It is installed inside to prevent insufficient filling of grout material. (5) The star-shaped injection spacer installed in the sheath pipe prevents twisting of a plurality of tension members in the sheath, so that there is no fear of one-sided effect when tension members are tensioned. This one-sided effect has a risk that the tension concentrates on a part of the individual tensile member and breaks even under a tension smaller than the anchor design load, but this is eliminated.
【図1】 本発明に係るグラウンドアンカーの正面図で
ある。FIG. 1 is a front view of a ground anchor according to the present invention.
【図2】 図1の中央縦断面図である。FIG. 2 is a central longitudinal sectional view of FIG.
【図3】 図1の3−3線に沿う断面図である。FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;
【図4】 図3の別の例を示す複線用の断面図である。FIG. 4 is a sectional view of another example of FIG. 3 for a double track.
【図5】 図1の4−4線に沿う単線用の断面図であ
る。FIG. 5 is a sectional view for a single line along the line 4-4 in FIG. 1;
【図6】 図5の別の例を示す複線用の断面図である。FIG. 6 is a cross-sectional view showing another example of FIG. 5 for a double track.
【図7】 本発明に係るグラウンドアンカーの使用状態
を示す概略説明図である。FIG. 7 is a schematic explanatory view showing a use state of the ground anchor according to the present invention.
【図8】 従来の周面摩擦アンカーの定着状態を示す中
央縦断面図である。FIG. 8 is a central longitudinal sectional view showing a fixed state of a conventional peripheral friction anchor.
1 固定金具 2 下部支圧プレート 3 支圧ロッド 4 ボトムキャップ 5 圧着グリップ 6 突起部 7 グラウト排出孔 8 固定台座 9 上部支圧プレート 10 鉄筋篭 11 引張材(アンボンドPC鋼より線) 12 星形注入スペーサー(複線用) 13 シースパイプ(注入ホース併用) 14 ストランドセンタライザー(単線用) REFERENCE SIGNS LIST 1 fixing bracket 2 lower supporting plate 3 supporting rod 4 bottom cap 5 crimping grip 6 protrusion 7 grout discharge hole 8 fixing pedestal 9 upper supporting plate 10 steel cage 11 tensile material (unbonded PC steel strand) 12 star injection Spacer (for double track) 13 Sheath pipe (for use with injection hose) 14 Strand centerizer (for single track)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 諸橋 富夫 新潟県栃尾市大字北荷頃4756 株式会社ユ ーアンドエム内 Fターム(参考) 2D041 GA01 GB01 GC02 GC05 GC07 GC14 GD02 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tomio Morohashi 4756 Kitahari, Tochio-shi, Niigata F-term in U & M Corporation (reference) 2D041 GA01 GB01 GC02 GC05 GC07 GC14 GD02
Claims (3)
引張材の一端に取付けた固定台座(8)と、引張材(11)を
貫挿させた状態で前記固定台座に連結した、固定金具
(1)を介して、グラウト材との摩擦抵抗力を増強させる
支圧ロッド(3)とこれを取り囲んで上下部の支圧プレー
ト(2)・(9)に連結した筒状を呈する鉄筋篭(10)とにより
構成したことを特徴とするグラウンドアンカー。An unbonded tension member (11), a fixed pedestal (8) attached to one end of the tension member, and a fixed pedestal connected to the fixed pedestal with the tension member (11) inserted therethrough. Metal fittings
(1), a supporting rod (3) for enhancing the frictional resistance with the grout material, and a cylindrical reinforcing bar cage surrounding the supporting rod and connected to the upper and lower supporting plates (2) and (9). (10) A ground anchor comprising:
シースパイプ(13)の中に、連続した星形柱状の注入断面
を確保するため複線の引張材(11)で挟み込むための鋼材
またはその他の素材で作られた星形注入スペーサー(12)
を設けた請求項1記載のグランドアンカー。2. A steel material for being sandwiched by a double-tracked tension member (11) in a sheath pipe (13) for an anticorrosion and injection tube covering the tension member (11) so as to secure a continuous star-shaped columnar injection cross section. Or star injection spacers made of other materials (12)
The ground anchor according to claim 1, further comprising:
(13)の中心に位置させ、シース内中央に引張材(11)を保
持する鋼材またはその他の素材で作られたストランドセ
ンタライザー(14)を設けた請求項1記載のグラウンドア
ンカー。3. A sheath pipe for injecting a single wire tension member (11).
The ground anchor according to claim 1, further comprising a strand centerer (14) made of steel or other material for holding the tension member (11) in the center of the sheath, located at the center of the (13).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000294754A JP3616321B2 (en) | 2000-09-27 | 2000-09-27 | Ground anchor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000294754A JP3616321B2 (en) | 2000-09-27 | 2000-09-27 | Ground anchor |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2002105955A true JP2002105955A (en) | 2002-04-10 |
JP3616321B2 JP3616321B2 (en) | 2005-02-02 |
Family
ID=18777291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000294754A Expired - Lifetime JP3616321B2 (en) | 2000-09-27 | 2000-09-27 | Ground anchor |
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Country | Link |
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JP (1) | JP3616321B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007284960A (en) * | 2006-04-14 | 2007-11-01 | Sumitomo Denko Steel Wire Kk | Ground anchor structure and its construction method |
JP2015206220A (en) * | 2014-04-22 | 2015-11-19 | ジェイアール東日本コンサルタンツ株式会社 | anchor structure |
CN106917411A (en) * | 2017-03-16 | 2017-07-04 | 广州市建誉科技有限责任公司 | Locking anchor cable structure and its construction method are anchored outside tension and compression complementary type |
-
2000
- 2000-09-27 JP JP2000294754A patent/JP3616321B2/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007284960A (en) * | 2006-04-14 | 2007-11-01 | Sumitomo Denko Steel Wire Kk | Ground anchor structure and its construction method |
JP4653690B2 (en) * | 2006-04-14 | 2011-03-16 | 住友電工スチールワイヤー株式会社 | Ground anchor structure and construction method |
JP2015206220A (en) * | 2014-04-22 | 2015-11-19 | ジェイアール東日本コンサルタンツ株式会社 | anchor structure |
CN106917411A (en) * | 2017-03-16 | 2017-07-04 | 广州市建誉科技有限责任公司 | Locking anchor cable structure and its construction method are anchored outside tension and compression complementary type |
Also Published As
Publication number | Publication date |
---|---|
JP3616321B2 (en) | 2005-02-02 |
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