JP2005264448A - Construction method of underground anchor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of an underground anchor, and an anchor member used in the method preventing a leakage of grout by easily and positively sealing in a short time after cutting a bag into required length. <P>SOLUTION: The respective lower ends of a tension member 5 and a grout hose 7 are bound tight with a base end opening of a cylindrical body 2a woven with aramid fiber, and the tip opening of the cylindrical body 2a is inserted through a socket 3 whose head periphery is threaded, and folded at the socket head. A cap 4 is screwed with the head of the socket 3, and the folded tip opening of the cylindrical body 2a is sealed with the cap 4 and socket 3 to form an anchor body of predetermined length formed into a bag 2. The anchor body is inserted in a borehole S formed in the ground, and grout G is pressed into the bag 2 through a grout hole 7 to expand the bag 2 in the borehole S. The grout G in the bag 2 is hardened to form an underground anchor part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、袋体を用いた地中アンカーの構築方法に関する。   The present invention relates to an underground anchor construction method using a bag.

従来、袋体を用いた地中アンカーの構築方法が特許文献１，２に開示されている。この技術は、引張部材の一端に構造物に対する固定機能を有する頭部を形成し、他端には合成繊維を筒状に織成した柔軟な袋体を嵌合して削孔に挿入し、袋体内にグラウトを注入して硬化させることを特徴としている。   Conventionally, methods for constructing underground anchors using bags are disclosed in Patent Documents 1 and 2. In this technique, a head having a function of fixing to a structure is formed at one end of a tensile member, and a flexible bag body in which a synthetic fiber is woven into a cylindrical shape is fitted to the other end and inserted into a hole, It is characterized by injecting grout into the body and curing.

ところで、前記技術に用いる袋体は予め一定の長さに製造されているもので、求めるアンカーに応じて袋体を現場で必要長さに切断して使用される。この際、切断開口部はエポキシ等の樹脂を浸透させた後ワイヤーで緊縛して封止するようにしているが、エポキシ樹脂が硬化するのに長時間を要するとともに作業が繁雑で手間を要し、封止にも確実性に欠けてグラウトが漏出することがあった。
実公平７−４５６３１号公報 特開２００２−２２７１９７号公報 By the way, the bag body used for the said technique is manufactured by the fixed length beforehand, and it cuts and uses a bag body to required length on-site according to the anchor to ask | require. At this time, the cut opening is infiltrated with a resin such as epoxy and then tightly sealed with a wire, but it takes a long time for the epoxy resin to harden and the work is complicated and laborious. Also, the grout may leak due to lack of certainty in sealing.
No. 7-45631 JP 2002-227197 A

本発明が解決しようとする課題は、従来のこれらの問題点を解消し、袋体を必要長さに切断後、短時間且つ確実に封止してグラウトの漏出を防止できる地中アンカーの構築方法を提供することにある。   The problem to be solved by the present invention is to solve these conventional problems, and to construct a ground anchor that can prevent leakage of grout by cutting the bag body to the required length and then sealing it in a short time and reliably. It is to provide a method.

かかる課題を解決した本発明の構成は、
１） 引張部材と硬化材の注入管の各下端部を合成繊維で織成された筒体の基端開口部で緊縛し、同筒体の先端開口部を頭部外周が螺刻されたソケットに挿通してソケット頭で折り返し、同ソケットの頭部にキャップを螺着し、同キャップとソケットとで筒体の折り返した先端開口部を封止することで袋体に形成して所定長さのアンカー体とし、同アンカー体を地盤に形成した削孔へ挿入し、袋体内に注入管で硬化材を圧入して袋体を削孔内で膨張させ、同袋体内の硬化材を硬化させて地中定着部とすることでアンカーを構築できるようにした地中アンカーの構築方法
２） 合成繊維で織成された筒体の先端開口部を頭部外周が螺刻されたソケットに挿通してソケット頭で折り返し、同ソケットの頭部にキャップを螺着し、同キャップとソケットとで筒体の折り返した先端開口部を封止した地中アンカー用袋体
にある。 The configuration of the present invention that solves this problem is as follows.
1) A socket in which the lower end of each of the tensile member and the hardener injection tube is fastened with a base end opening of a cylinder woven with synthetic fibers, and the tip opening of the cylinder is threaded on the outer periphery of the head Is inserted into the socket head and folded back at the socket head, a cap is screwed onto the socket head, and the cap and socket are sealed to the folded end opening of the cylinder to form a bag body having a predetermined length. The anchor body is inserted into a drilling hole formed in the ground, the hardening material is press-fitted into the bag body with an injection tube, the bag body is expanded in the drilling hole, and the hardening material in the bag body is cured. 2) An underground anchor construction method that allows anchors to be constructed by using an underground anchoring part 2) Inserting the tip opening of a cylinder woven from synthetic fibers into a socket threaded on the outer periphery of the head Fold it back at the socket head and screw the cap onto the socket head. Cylindrical body in bag for sealed underground anchor the folded tip opening of between.

本発明によれば、袋体の切断した先端開口部をソケットとキャップとで螺着により圧接するから、容易且つ確実に短時間に封止ができ、作業の省力化，工期の短縮化を図ることができる。   According to the present invention, since the opening of the cut end of the bag body is press-contacted with the socket and the cap by screwing, it can be easily and surely sealed in a short time, saving labor and shortening the construction period. be able to.

本発明のソケット及びキャップとしては、塩化ビニル樹脂，ＡＢＳ樹脂等耐酸性，耐久性を有する経年変化の少ない合成樹脂品が望ましい。   As the socket and the cap of the present invention, a synthetic resin product having acid resistance and durability, such as vinyl chloride resin and ABS resin and having little secular change is desirable.

引張部材としては、ＰＣ鋼線，ＰＣ鋼より線，異形ＰＣ鋼線，ＰＣ鋼棒，異形ＰＣ鋼棒などから選ばれ、必要に応じて表面をグリースや合成樹脂等で被覆して防錆処理を施してもよい。   The tensile member is selected from PC steel wire, PC steel strand, deformed PC steel wire, PC steel rod, deformed PC steel rod, etc., and the surface is coated with grease or synthetic resin as necessary to prevent rust. May be applied.

袋体を構成する筒体としては、ポリエステル，ポリプロピレン，ポリビニルアルコール，アラミド等から選ばれた合成繊維を織成したもので、強度や耐アルカリ性が求められる箇所ではアラミド繊維で構成されたものが望ましく、所要長さに製造するか又は予め長尺に製造して現場で必要長さに切断して用いられる。   As the cylindrical body constituting the bag body, a synthetic fiber selected from polyester, polypropylene, polyvinyl alcohol, aramid and the like is woven, and where the strength and alkali resistance are required, those composed of aramid fibers are desirable. It is manufactured to the required length, or manufactured in advance and cut into the required length at the site.

硬化材としてはポルトランドセメントに水，細骨材，ＡＥ剤・減水剤・膨張材等の混和材料を混入したセメント系グラウト、ポリウレタン系の熱可塑性樹脂，エポキシ樹脂等の熱硬化性樹脂からなる合成樹脂系グラウトがあり、強酸地帯では合成樹脂系が望ましい。以下、本発明の実施例を図面に基づいて具体的に説明する。   As a hardener, synthetics consisting of Portland cement, cement-based grout mixed with admixtures such as water, fine aggregate, AE agent, water reducing agent, and expansion agent, polyurethane-based thermoplastic resin, epoxy resin, etc. There are resin grouts, and synthetic resin systems are desirable in strong acid zones. Embodiments of the present invention will be specifically described below with reference to the drawings.

図１は実施例の地中アンカーの構築状態を示す断面図、図２は実施例のソケット及びキャップの断面図、図３，４は実施例の袋体の封止を示す説明図、図５，６は実施例の地中アンカーの構築を示す説明図である。図中、１はアンカー、２は袋体、２ａは筒体、３はソケット、３ａは螺刻部、３ｂは先端部、４はキャップ、５は引張部材、６はバンド、７はグラウトホース、８は台座、９は定着具、９ａは支持板、１０は被覆部材、１１は構造物、Ｇはグラウト、Ｓは削孔である。   1 is a cross-sectional view showing a construction state of the underground anchor of the embodiment, FIG. 2 is a cross-sectional view of the socket and cap of the embodiment, FIGS. 3 and 4 are explanatory views showing sealing of the bag body of the embodiment, FIG. , 6 are explanatory diagrams showing the construction of the underground anchor of the embodiment. In the figure, 1 is an anchor, 2 is a bag, 2a is a cylinder, 3 is a socket, 3a is a threaded portion, 3b is a tip, 4 is a cap, 5 is a tension member, 6 is a band, 7 is a grout hose, 8 is a base, 9 is a fixing tool, 9a is a support plate, 10 is a covering member, 11 is a structure, G is a grout, and S is a drilling hole.

本実施例では、図３（ａ）に示すようにＰＣ鋼棒からなる引張部材５及びグラウトホース７の各下端部を所要長さに切断したアラミド繊維からなる筒体２ａの基端開口部で被覆し、基端開口部にエポキシ樹脂を浸透硬化させてバンド６により緊縛する。   In this embodiment, as shown in FIG. 3 (a), at the base end opening portion of the cylindrical body 2a made of aramid fibers obtained by cutting the lower ends of the tensile member 5 made of a PC steel rod and the grout hose 7 to a required length. Covering is performed, and an epoxy resin is osmotically cured in the base end opening portion and is bound by the band 6.

筒体２ａの先端開口部は、図３（ｂ）に示すように頭部に螺刻部３ａが形成された塩化ビニル樹脂からなるソケット３に挿通して図３（ｃ）に示すように反対側へ引き出し、図４（ａ）に示すように露出した部分をソケット頭を覆うように折り返し、その折り返し部分を図４（ｂ）に示すようにキャップ４で被覆して螺着し、図２に示すようにソケット３及びキャップ４間に介装された筒体２ａがソケット３の先端部３ｂとキャップ４の内面で圧接して封止されることで所定長さの袋体２に構成され、これをアンカー体とする。   As shown in FIG. 3 (c), the distal end opening of the cylindrical body 2a is inserted into a socket 3 made of vinyl chloride resin having a threaded portion 3a formed on the head as shown in FIG. 3 (b). 4 (a), the exposed portion is folded back so as to cover the socket head, and the folded portion is covered with a cap 4 as shown in FIG. 4 (b) and screwed. As shown in FIG. 3, the cylindrical body 2a interposed between the socket 3 and the cap 4 is sealed by being pressed against the tip 3b of the socket 3 and the inner surface of the cap 4 to form a bag body 2 having a predetermined length. This is the anchor body.

このアンカー体を図５（ａ）に示す様に構造物１１及び地盤に形成した削孔Ｓに挿入して構造物１１の表面に設置した台座８で仮支持し、図５（ｂ）に示すようにグラウトホース７の基端部からポリウレタン樹脂からなる合成樹脂系のグラウトＧを袋体２内に圧入して袋体２を削孔Ｓ内で膨張させ、次いで図６（ａ）に示すように引張部材５のテンドン自由長部分にグラウトＧを二次圧入する。   As shown in FIG. 5A, the anchor body is inserted into the structure 11 and the drilling hole S formed in the ground, and temporarily supported by the base 8 installed on the surface of the structure 11, and shown in FIG. 5B. As shown in FIG. 6A, a synthetic resin grout G made of polyurethane resin is press-fitted into the bag body 2 from the base end of the grout hose 7 to inflate the bag body 2 in the hole S. The grout G is secondarily pressed into the tendon free length portion of the tension member 5.

グラウトＧが硬化すると、図６（ｂ）に示すように台座８上に支持板９ａを介して定着具９で引張部材５を定着し、定着具９を被覆部材１０で被覆して地中アンカー１の構築が完了する。   When the grout G is cured, as shown in FIG. 6B, the tension member 5 is fixed on the base 8 via the support plate 9a with the fixing tool 9 and the fixing tool 9 is covered with the covering member 10 so as to fix the ground anchor. The construction of 1 is completed.

本実施例はこのように構成したから、袋体２の先端開口部をソケット３とキャップ４とで螺着により圧接するから、容易且つ確実に短時間に封止でき、作業の省力化，工期の短縮化を図ることができた。   Since the present embodiment is configured as described above, the front end opening of the bag body 2 is press-contacted with the socket 3 and the cap 4 by screwing. Therefore, the bag body 2 can be easily and reliably sealed in a short time, labor saving and work period. Was shortened.

本発明は、構造物を地盤に定着させる永久アンカー，仮設アンカー等の地中アンカーに利用できる。   The present invention can be used for underground anchors such as permanent anchors and temporary anchors for fixing a structure to the ground.

実施例の地中アンカーの構築状態を示す説明図である。It is explanatory drawing which shows the construction state of the underground anchor of an Example. 実施例のソケット及びキャップの断面図である。It is sectional drawing of the socket and cap of an Example. 実施例の袋体の封止を示す説明図である。It is explanatory drawing which shows sealing of the bag body of an Example. 実施例の袋体の封止を示す説明図である。It is explanatory drawing which shows sealing of the bag body of an Example. 実施例の地中アンカーの構築を示す説明図である。It is explanatory drawing which shows construction of the underground anchor of an Example. 実施例の地中アンカーの構築を示す説明図である。It is explanatory drawing which shows construction of the underground anchor of an Example.

符号の説明Explanation of symbols

１ 地中アンカー
２ 袋体
２ａ 筒体
３ ソケット
３ａ 螺刻部
３ｂ 先端部
４ キャップ
５ 引張部材
６ バンド
７ グラウトホース
８ 台座
９ 定着具
９ａ 支持板
１０ 被覆部材
１１ 構造物
Ｇ グラウト
Ｓ 削孔 DESCRIPTION OF SYMBOLS 1 Ground anchor 2 Bag body 2a Tube 3 Socket 3a Screw part 3b Tip part 4 Cap 5 Tension member 6 Band 7 Grout hose 8 Base 9 Fixing tool 9a Support plate 10 Cover member 11 Structure G Grout S Hole

Claims (2)

引張部材と硬化材の注入管の各下端部を合成繊維で織成された筒体の基端開口部で緊縛し、同筒体の先端開口部を頭部外周が螺刻されたソケットに挿通してソケット頭で折り返し、同ソケットの頭部にキャップを螺着し、同キャップとソケットとで筒体の折り返した先端開口部を封止することで袋体に形成して所定長さのアンカー体とし、同アンカー体を地盤に形成した削孔へ挿入し、袋体内に注入管で硬化材を圧入して袋体を削孔内で膨張させ、同袋体内の硬化材を硬化させて地中定着部とすることでアンカーを構築できるようにした地中アンカーの構築方法。   The lower end of each of the tensile member and the hardener injection tube is fastened with the base end opening of the cylinder woven with synthetic fiber, and the end opening of the cylinder is inserted into the socket with the outer periphery of the head threaded. Then, it is folded back at the socket head, a cap is screwed onto the head of the socket, and the tip opening portion of the tubular body is sealed with the cap and the socket to form a bag body with a predetermined length of anchor. The anchor body is inserted into a drilling hole formed in the ground, a hardening material is press-fitted into the bag body with an injection tube, the bag body is expanded in the drilling hole, and the hardening material in the bag body is hardened to be ground. An underground anchor construction method that allows anchors to be constructed by using an intermediate fixing part. 合成繊維で織成された筒体の先端開口部を頭部外周が螺刻されたソケットに挿通してソケット頭で折り返し、同ソケットの頭部にキャップを螺着し、同キャップとソケットとで筒体の折り返した先端開口部を封止した地中アンカー用袋体。   Insert the end opening of the cylinder woven with synthetic fiber into the socket with the outer periphery of the head threaded, fold it back at the socket head, screw the cap onto the head of the socket, and An underground anchor bag body in which a folded end opening of a cylindrical body is sealed.

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