JP2003278153A - Rock bolt construction method for face of slope, and secured structure of rock bolt head - Google Patents
Rock bolt construction method for face of slope, and secured structure of rock bolt headInfo
- Publication number
- JP2003278153A JP2003278153A JP2002129388A JP2002129388A JP2003278153A JP 2003278153 A JP2003278153 A JP 2003278153A JP 2002129388 A JP2002129388 A JP 2002129388A JP 2002129388 A JP2002129388 A JP 2002129388A JP 2003278153 A JP2003278153 A JP 2003278153A
- Authority
- JP
- Japan
- Prior art keywords
- sheath
- lock bolt
- slope
- pedestal member
- bolt
- 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】本発明は法面へのロックボル
ト施工法及びロックボルト頭部の水封緊締構造に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a lock bolt on a slope and a watertight tightening structure for a lock bolt head.
【０００２】[0002]
【従来の技術】従来、法面へのロックボルトの施工は、
法面に形成のロックボルト挿し立て用の削孔穴内にセメ
ントペーストを打設した後に、該ペースト内にロックボ
ルトの定着用部を挿入し、しかる後、該ペーストの養生
硬化を待ってロックボルト頭部の緊締を行っていた。こ
のような法面へのロックボルト施工において、ロックボ
ルトとしては一般にシースなしのいわゆる裸のロックボ
ルトが使用されており、ロックボルト、特に、養生硬化
層より上方に位置する自由用部は、上記削孔穴内に浸入
してくる地下水等との接触により早期に発錆し腐食する
恐れがあるので、ロックボルトの自由用部にシースを施
し、地下水等との接触を防止することが必要になる。2. Description of the Related Art Conventionally, the construction of a rock bolt on the slope is
After the cement paste is placed in the drilling hole for inserting the rock bolt formed on the slope, the fixing portion of the lock bolt is inserted into the paste, and then the lock bolt is awaited for curing curing of the paste. I was tightening my head. In the lock bolt construction on such a slope, a so-called bare rock bolt without a sheath is generally used as the lock bolt, and the lock bolt, in particular, the free part located above the curing layer is There is a risk of rusting and corrosion at an early stage due to contact with groundwater entering the drilled hole, so it is necessary to apply a sheath to the free part of the lock bolt to prevent contact with groundwater. .
【０００３】従来、例えば特開平１１−２２９３７４号
公報において、水封対策を備えたロックボルトの頭部緊
締構造が提案されている。この従来構成のものは、図７
に示すように、シースａ′が上端部に鍔部ｂ′を備えて
いるので、シースａ′と台座部材ｃ′（ジョイントプレ
ート、支圧プレート等）の取り付けの順番は、台座部材
ｃ′それからシースａ′の順となり、台座部材ｃ′の先
付けが必要になる。Conventionally, for example, in Japanese Patent Laid-Open No. 11-229374, there has been proposed a head tightening structure for a lock bolt having a water seal countermeasure. This conventional configuration is shown in FIG.
As shown in Fig. 5, since the sheath a'has a flange b'on its upper end, the sheath a'and the pedestal member c '(joint plate, bearing plate, etc.) can be attached in order from the pedestal member c' The sheath a'becomes in order, and the base member c'needs to be attached first.
【０００４】[0004]
【発明が解決しようとする課題】法面へのロックボルト
施工は、一般にロックボルトとしてシースなしの裸のロ
ックボルトを適用するので、水封対策としてロックボル
トの自由用部にシースを施す場合には、ロックボルトの
自由用部の外回りに嵌挿したシースの下端部を養生硬化
前にペースト内に内に挿入埋設し、シース下端側の水封
対策としておくことが必要になる。When a rock bolt is applied to the slope, a bare rock bolt without a sheath is generally used as the lock bolt. Therefore, when a sheath is applied to the free portion of the rock bolt as a water seal measure. It is necessary that the lower end of the sheath, which is fitted around the free portion of the lock bolt, is inserted and embedded in the paste before the curing and curing, as a measure for sealing the lower end of the sheath with water.
【０００５】ところが上記従来構成のものでは、シース
ａ′が上端部に鍔部ｂ′を備えているので、シースの取
り付け工程より前の工程で台座部材の取り付けを行わね
ばならず、このような台座部材の先付けの必要性は施工
上に次のような問題を招き、好ましくない。イ．先付け
された台座部材は法面の傾斜に沿い重力移動する傾向と
なるので、台座部材を一方の手で支え台座部材とロック
ボルト間にシースの差込空間を確保しつつ他方の手でシ
ースの差込作業を行うことが必要になる。法面での作業
は足場が悪くまた高所作業となることが多いので、この
ような両手作業は、煩わしいばかりでなく危険でもあ
る。ロ．セメントペーストは養生硬化の間に硬化収縮し
やせることが多いので、養生硬化後に養生硬化層のやせ
具合ひいては該層内へのシース下端部の埋設状況を目視
確認し、埋設状況に不具合がある場合にはセメントペー
ストの補充充填を行うことが好ましいが、台座部材を先
付けしておくと、目視確認ひいてはセメントペーストの
補充充填ができなくなり、シース下端側の水封対策の面
で不安を残す。However, in the above-mentioned conventional structure, since the sheath a'has the flange b'at the upper end, the pedestal member must be attached in a step prior to the sheath attaching step. The necessity of attaching the pedestal member in advance causes the following problems in construction and is not preferable. I. Since the pedestal member attached in advance has a tendency to move by gravity along the slope of the slope, support the pedestal member with one hand and secure the insertion space of the sheath between the pedestal member and the lock bolt, while the other hand holds the sheath member. It is necessary to do the plug-in work. Since the work on the slope is unfavorable in many cases and is often performed at a high place, such two-handed work is not only troublesome but also dangerous. B. Cement paste often hardens and shrinks during curing, so after the curing, visually check the thinness of the cured layer and the embedding condition of the sheath lower end inside the layer, and if the embedding condition is defective. It is preferable to perform supplemental filling of the cement paste, but if the pedestal member is attached in advance, it becomes impossible to perform visual confirmation and thus supplementary filling of the cement paste, leaving anxiety in terms of measures against water sealing on the lower end side of the sheath.
【０００６】本発明は施工性並びに水封対策の安全性に
優れる法面へのロックボルト施工法及びロックボルト頭
部の緊締構造を提供することを目的としてなされたもの
である。The present invention has been made for the purpose of providing a method for constructing a lock bolt on a slope and a tightening structure for a lock bolt head, which is excellent in workability and safety as a countermeasure against water sealing.
【０００７】[0007]
【課題を解決するための手段】本発明は、法面に形成の
ロックボルト挿し立て用の削孔穴内に打設されたセメン
トペースト内にシースなしの裸のロックボルトの定着用
部を挿入すると共に該ボルトの頭部を法面上方に突出さ
せる第１工程、上記ロックボルトの頭部を通じその外周
りに嵌挿された上端鍔なしのシースの下部領域を上記ペ
ースト内に挿入すると共に上部領域を法面より上方に突
出させる第２工程、上記ペーストを養生硬化させた後
に、台座部材をその中央部の取り付け穴において上記シ
ースの外回りに嵌め通し法面上に設置する第３工程、上
記台座部材より上方位置でシースの上端部の外周りに弾
性シールリングを嵌装し取り付ける第４工程、上記ロッ
クボルトの頭部に球面座金及び球面ナットを取り付け、
上記ナットの緊締によりロックボルトに緊張を与えると
共にシールリングを球面座金、台座部材及びシースの間
で狭圧保持することにより上記シースの上端部の外回り
に水封を施す第５工程、を含むことを特徴とする法面へ
のロックボルト施工法に係る。According to the present invention, a fixing portion of a bare rock bolt without a sheath is inserted into a cement paste that is cast in a hole for inserting a rock bolt that is formed on a slope. With the first step of projecting the head of the bolt above the slope, the lower area of the sheath without an upper flange that is fitted around the outer periphery of the head of the lock bolt is inserted into the paste and the upper area. The second step of projecting above the slope surface, the third step of curing the paste by curing and then mounting the pedestal member on the slope surface by fitting the pedestal member around the outer periphery of the sheath in the mounting hole at the central portion thereof, and the pedestal. A fourth step of fitting and attaching an elastic seal ring around the outer periphery of the upper end of the sheath above the member, attaching a spherical washer and a spherical nut to the head of the lock bolt,
A fifth step of applying water tension to the outer circumference of the upper end of the sheath by tightening the nut to apply tension to the lock bolt and holding the seal ring in a narrow pressure between the spherical washer, the pedestal member and the sheath. Related to the method of constructing a rock bolt on the slope.
【０００８】本発明施工法の好ましい一実施形態によれ
ば、セメントペーストが硬化するまでの間、シースを取
り付け位置に拘束するために、短径側の両側部にフラッ
ト部を長径側の両側部にねじ部を有する楕円乃至長円形
断面のロックボルトと、下端部の内周面に内方突出の少
なくとも１つの爪部を有するシースが適用し、シース下
部領域のセメントペースト内への挿入時には爪部がロッ
クボルトのフラット部に位置しており、挿入後に、シー
スを中心軸線周りの方向に回転して爪部をロックボルト
のねじ部側に移動し、爪部をねじ部に係止させる構成と
することができる。According to a preferred embodiment of the construction method of the present invention, in order to restrain the sheath in the mounting position until the cement paste is hardened, the flat portions are provided on both sides of the minor diameter side and the flat portions on both sides of the major diameter side. A lock bolt having an elliptical or oval cross section having a threaded portion and a sheath having at least one inwardly projecting claw portion on the inner peripheral surface of the lower end portion are applied, and when the sheath lower region is inserted into the cement paste, the claw is applied. The part is located in the flat part of the lock bolt, and after insertion, the sheath is rotated around the central axis to move the claw part to the screw part side of the lock bolt, and the claw part is locked to the screw part. Can be
【０００９】更に本発明は、請求項１記載のロックボル
ト施工法に適用される水封緊締構造であって、シースな
しの裸のロックボルト、上端鍔なしのシース、台座部
材、弾性シールリング、球面座がね及び球面ナットを含
み、上記ロックボルトは法面に形成の削孔穴内に打設の
セメントペーストの養生硬化層内に定着用部において挿
着固定されており、上記シースは上記ロックボルトの自
由用部の外回りを覆った状態で、下部領域が上記養生硬
化層内に埋設固定され上部領域が法面より上方に突出さ
れており、台座部材はその中央部取り付け穴において上
記シースの上端フランジなし部を通過して法面上に設置
されており、弾性シールリングは上記台座部材より上方
へ突出するシースの上端部の外回りに嵌装されており、
球面座金及び球面ナットは上記ロックボルトの頭部に取
り付けられており、ロックボルトには上記ナットの緊締
により緊張が与えられていて、この緊張状態下で、シー
ルリングは球面座金、台座部材及びシースの間で狭圧保
持され、このシールリングの狭圧保持によりシースの上
端部の外回りに水封が施されていることを特徴とするロ
ックボルト頭部の緊締構造に係る。Further, the present invention is a water seal tightening structure applied to the method for constructing a lock bolt according to claim 1, wherein a bare rock bolt without a sheath, a sheath without an upper flange, a pedestal member, an elastic seal ring, Including a spherical washer and a spherical nut, the lock bolt is inserted and fixed in a fixing portion in a curing hardening layer of cement paste placed in a hole formed in a slope, and the sheath is in the lock. With the outer periphery of the free part of the bolt covered, the lower region is embedded and fixed in the curing layer and the upper region is projected above the slope, and the pedestal member is attached to the central portion of the sheath hole of the sheath. It is installed on the slope passing through the upper end flangeless portion, the elastic seal ring is fitted around the upper end portion of the sheath projecting upward from the pedestal member,
The spherical washer and the spherical nut are attached to the head of the lock bolt, and the lock bolt is tensioned by the tightening of the nut.Under this tension, the seal ring has the spherical washer, the base member and the sheath. A tight tightening structure of a lock bolt head is characterized in that a narrow pressure is held between them and a water seal is applied to the outer circumference of the upper end of the sheath by the narrow holding of the seal ring.
【００１０】本発明水封緊締構造の好ましい一実施形態
に於いては、ロックボルトが楕円乃至長円形断面を有し
ていて短径側の両側部にフラット部をまた長径側の両側
部にねじ部を備え、一方シースは下端部の内周面に内方
突出の少なくとも１つの爪部を備え、爪部をフラット部
に位置させたときは、シースはロックボルトへの嵌挿状
態においてロックボルトの軸方向に移動自在であり、シ
ースを中心軸線周りの方向に回転させ爪部をフラット部
からねじ部に移動させたときは、爪部がねじ部に係止し
シースを軸方向の移動位置で拘束できる構成になってい
てもよい。In a preferred embodiment of the watertight tightening structure of the present invention, the lock bolt has an elliptical or elliptical cross section and has flat portions on both sides on the minor diameter side and screws on both sides on the major diameter side. On the other hand, the sheath is provided with at least one inwardly projecting claw portion on the inner peripheral surface of the lower end portion, and when the claw portion is positioned at the flat portion, the sheath is in a state of being fitted into the lock bolt and the lock bolt. When the claw part is moved from the flat part to the screw part by rotating the sheath in the direction around the central axis, the claw part is locked to the screw part and the sheath moves in the axial direction. It may be configured to be restrained by.
【００１１】また、球面座金は下端部の内周面に傾斜部
を備え、ナットの緊締時に、該傾斜部を介しシールリン
グを保有弾性に抗し台座部材並びにシースに対し押しつ
けることができる構成になっていてもよい。Further, the spherical washer has an inclined portion on the inner peripheral surface of the lower end portion, and when the nut is tightened, the seal ring can be pressed against the pedestal member and the sheath through the inclined portion against the resilience. It may be.
【００１２】更にまた、シースが、上端部の外周面にシ
ールリングを嵌め止めるための周溝を、また周溝より下
方の位置に伸縮および屈曲自在部を備えるような構成に
なっていてもよい。Furthermore, the sheath may be configured to have a peripheral groove for fitting the seal ring on the outer peripheral surface of the upper end portion, and an expandable / contractible portion at a position below the peripheral groove. .
【００１３】[0013]
【発明の実施の形態】以下に本発明の一実施形態を添付
図面１〜３に基づき説明する。本発明において、球面ナ
ット１、球面座がね２及び台座部材３は図６に示す従来
構成のものと実質的に異なるところがないが、シース４
が上端鍔なしである点、該シース４の上端部の外回りに
弾性シールリング５が適用される点及びロックボルトと
してシースなしのいわゆる裸のロックボルト６が適用さ
れる点で、構成を相違している。因みに、シース４とし
てはゴムまたはプラスチック製のものが、またシールリ
ング５としてはゴム製のものが一般的である。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings 1 to 3. In the present invention, the spherical nut 1, the spherical base plate 2, and the base member 3 are substantially the same as those of the conventional structure shown in FIG.
Has no upper flange, an elastic seal ring 5 is applied around the upper end of the sheath 4, and a so-called bare lock bolt 6 without a sheath is applied as a lock bolt. ing. Incidentally, the sheath 4 is generally made of rubber or plastic, and the seal ring 5 is generally made of rubber.
【００１４】本発明ロックボルト施工法においては、第
１工程において、常法通り、最初に法面ａにロックボル
ト挿立て用の削孔穴ｂが形成され、次に該削孔穴ｂ内に
セメントペーストｃが所定深さに打設され、該ペースト
ｃ内にシースなしの裸のロックボルト６が定着用部６ａ
において挿入される。第１工程終了時の状況が図１に示
され、ロックボルト６の定着用部６ａは上記ペーストｃ
内に、これに続く自由用部６ｂは上記削孔穴ｂ内のペー
スト未充填による空所ｂ１に、またこれに続く頭部６ｃ
は法面ａ上方に突出している。In the lock bolt construction method of the present invention, in the first step, a drill hole b for inserting the lock bolt is first formed on the slope a in the first step, and then the cement paste is formed in the drill hole b. c is cast to a predetermined depth, and a bare lock bolt 6 without a sheath is fixed in the paste c by the fixing portion 6a.
Is inserted at. The situation at the end of the first step is shown in FIG. 1, and the fixing portion 6a of the lock bolt 6 is the paste c.
The free portion 6b following this is located in the void b1 in the drilled hole b due to unfilled paste, and the head 6c following this.
Projects above the slope a.
【００１５】第２工程において、シース４の取り付けが
行われる。シースの取り付けは、上記ペーストｃの養生
硬化前に行われ、シース４はロックボルト６の外回りに
フリーに嵌挿された状態で頭部６ｃから定着用部６ａへ
と押し込まれて行き、この押し込みにより、シース４の
下部領域はペーストｃ内に挿入される。シース４の取り
付け後の状況が図２に示され、この取り付け状態に於い
ては、シース４の中央領域はロックボルト６の自由用部
６ｂの外回りを覆い、該自由用部６ｂを空所ｂ１に溜ま
る地下水等から隔離する保護カバーとしての働きする。
またシース４の上部領域は法面上方に突出し、この突出
部４ａには下記の工程で台座部材３及びシールリング５
が取り付けられる。In the second step, the sheath 4 is attached. The sheath is attached before the curing and curing of the paste c, and the sheath 4 is pushed from the head portion 6c to the fixing portion 6a in a state in which the sheath 4 is freely fitted around the outer circumference of the lock bolt 6, and this push-in is performed. Thereby, the lower region of the sheath 4 is inserted into the paste c. The situation after the sheath 4 is attached is shown in FIG. 2, and in this attached state, the central region of the sheath 4 covers the outer circumference of the free portion 6b of the lock bolt 6, and the free portion 6b is left in the space b1. It acts as a protective cover that isolates it from the groundwater that collects in it.
Further, the upper region of the sheath 4 projects above the slope, and the pedestal member 3 and the seal ring 5 are attached to the projecting portion 4a in the following process.
Is attached.
【００１６】図２に示すように、シース４の取り付け工
程に於いては、未だ台座部材３は設置されていないの
で、単にシース４の取り付け作業のみを行えばよく、法
面という足場の悪い高所作業であっても、作業容易に安
全に行うことができる。As shown in FIG. 2, since the pedestal member 3 has not yet been installed in the process of attaching the sheath 4, only the attaching work of the sheath 4 is required, and the slope has a bad footing. Even when working locally, work can be performed easily and safely.
【００１７】シース４の取り付けを終えた後は、セメン
トペーストｃを養生硬化させセメント層ｃ１となすこと
により、ロックボルト６の定着用部６ａをセメント層ｃ
１に一体に結合できる。セメント層ｃ１は養生硬化時の
硬化収縮によりやせを生じることが多いので、やせ具合
よってはセメント層ｃ１内へのシース４下部領域の差込
に不具合が生じ、シースの下端部を通じその内部に地下
水等が浸入する恐れがある。本発明によれば、シース４
の取り付け工程に於いては、いまだ台座部材３は設置さ
れていないので、上記削穴ｂの上端開口は開放されたま
まであり、この開口を通じ、セメント層ｃ１の目視確認
並びに必要によってはセメントモルタルの補充充填を支
障なく行うことができ、シース下端側の水封対策を確実
なものとなし得る。After the sheath 4 is attached, the cement paste c is cured and hardened to form the cement layer c1, so that the fixing portion 6a of the lock bolt 6 is fixed to the cement layer c.
1 can be integrally connected. Since the cement layer c1 often causes thinning due to curing shrinkage during curing, depending on the thinness condition, there is a problem in inserting the lower region of the sheath 4 into the cement layer c1 and groundwater enters through the lower end of the sheath to the inside thereof. There is a risk of infiltration. According to the invention, the sheath 4
In the mounting step of No. 3, since the pedestal member 3 has not been installed yet, the upper end opening of the drilled hole b remains open, and through this opening, visual confirmation of the cement layer c1 and, if necessary, cement cement mortar The refilling can be performed without any trouble, and the water sealing measure on the lower end side of the sheath can be ensured.
【００１８】図３に示すように、セメントペーストｃの
養生硬化後に、第３、４工程として、シース４の突出部
４ａ外回りへの台座部材３及びシールリング５の取り付
けが、また第５工程として、ロックボルト頭部６ｃへの
球面座金２及び球面ナット１の取り付けが順次行われ、
しかる後に上記ナット１の緊締によりロックボルト６に
緊張が与えることにより、法面へのロックボルト施工が
終了する。、尚、ロックボルトへの緊張付与後は、常法
通り、ロックボルトの頭部６ｃに、球面ナット１及び球
面座金２を覆うように、防錆材７充填の保護キャップ８
を施すことができる。球面ナット１の緊締状態に於いて
は、シールリング５は球面座金２、台座部材３及びシー
ス４の間で狭圧保持され、シース４の上端部の外回りに
シールが形成され、よってシール４の上端側の水封対策
も万全なものとなる。この場合、球面座金２の下端部の
内周面に、シールリング５を斜め内向きに押し圧するた
めの傾斜面２ａを形成しておけば、シールをより一層確
実なものとなし得る。As shown in FIG. 3, after the cement paste c is cured and cured, as the third and fourth steps, the mounting of the pedestal member 3 and the seal ring 5 around the protruding portion 4a of the sheath 4 and the fifth step are performed. , The spherical washer 2 and the spherical nut 1 are sequentially attached to the lock bolt head 6c,
Thereafter, the lock bolt 6 is tightened by the tightening of the nut 1 to complete the construction of the lock bolt on the slope. After the tension is applied to the lock bolt, the head 6c of the lock bolt is covered with the protection cap 8 filled with the rust preventive material 7 so as to cover the spherical nut 1 and the spherical washer 2 in the usual manner.
Can be applied. In the tightened state of the spherical nut 1, the seal ring 5 is held under a narrow pressure between the spherical washer 2, the pedestal member 3 and the sheath 4, and a seal is formed on the outer periphery of the upper end portion of the sheath 4. The water sealing measures on the upper end side will be perfect. In this case, if the inclined surface 2a for pressing the seal ring 5 obliquely inward is formed on the inner peripheral surface of the lower end portion of the spherical washer 2, the sealing can be made more reliable.
【００１９】本発明においては、シース４の取り付け
後、セメントペーストが未だ流動性を有している間は、
シース４が浮き沈みする等、不安定な取り付け状況が続
くので、シース４を取り付け位置で拘束するための手段
を講じておくことが好ましい。例えばロックボルト６と
して、図４に示すような、楕円乃至長円形棒状にして短
径側の両側部にフラット部６ｄをまた長径側の両側部に
ねじ部６ｅを備えた構成のものを、一方シース４として
図３、５に示すように下端部の内周面に内方突出の少な
くとも１つ例えば等間隔配置に２つの爪部４ｂを備えた
構成のものを用い、爪部４ｂをフラット部６ｄに位置さ
せた状態でロックボルト６に沿いシース４を所定部位ま
で挿入して行き、所定位置まで挿入した後は、シース４
を中心軸線周りの方向に所定角度例えば９０°回転さ
せ、爪部４ｂをねじ部６ｅに係止させる等の拘束手段を
採用することができる。In the present invention, after the sheath 4 is attached, while the cement paste is still fluid,
Since an unstable mounting condition such as ups and downs of the sheath 4 continues, it is preferable to take measures to restrain the sheath 4 at the mounting position. For example, as the lock bolt 6, as shown in FIG. 4, one having an elliptic or elliptical rod shape and having flat portions 6d on both sides on the minor diameter side and screw portions 6e on both sides on the major diameter side is used. As shown in FIGS. 3 and 5, as the sheath 4, at least one inwardly projecting inner peripheral surface of the lower end portion, for example, a configuration including two claw portions 4b arranged at equal intervals is used, and the claw portion 4b is a flat portion. 6d, the sheath 4 is inserted along the lock bolt 6 to a predetermined portion, and after the insertion to the predetermined position, the sheath 4 is inserted.
It is possible to employ a restraint means such that the claw portion 4b is locked to the screw portion 6e by rotating the claw portion 4b at a predetermined angle, for example, 90 ° around the central axis.
【００２０】図３に示すように、シース４の上部領域に
蛇腹部４ｃを形成しておけば、シース４の突出部４ａの
突出長さに過不足が生じた場合には、蛇腹部４ｃの伸縮
および屈曲自在性により過不足を補正吸収できる。また
シース４の上端部の外周面にリングシール４の嵌止用の
周溝４ｄを形成しておくことができ、この場合、シース
４の取り付け状態のよっては周溝４ｄの位置が上下にず
れる恐れがあるが、この位置ずれは上記蛇腹部４ｃの伸
縮自在性により補正吸収することができ、該周溝４ｄに
嵌止のシールリング５を支障なく台座部材３上に位置さ
せることができる。As shown in FIG. 3, if the bellows portion 4c is formed in the upper region of the sheath 4, when the protruding length of the protruding portion 4a of the sheath 4 is excessive or insufficient, the bellows portion 4c of the protruding portion 4a is formed. Excess and shortage can be compensated and absorbed by the flexibility of expansion and contraction. Further, a peripheral groove 4d for fitting the ring seal 4 can be formed on the outer peripheral surface of the upper end portion of the sheath 4, and in this case, the position of the peripheral groove 4d is vertically displaced depending on the attached state of the sheath 4. Although there is a fear, this positional deviation can be corrected and absorbed by the expandability of the bellows portion 4c, and the seal ring 5 that is fitted in the peripheral groove 4d can be positioned on the pedestal member 3 without hindrance.
【００２１】図６に示すように、シース４下部の直線部
の少なくとも２ヶ所に削孔穴の内径と概ね一致あるいは
少し小さな張出幅のスペーサー部４ｅを一体に設けるこ
とで、シース４をロックボルトに設置すると同時に削孔
穴にセンタリングを行うことができる。スペーサー部４
ｅは図６に示すように、対象方向ではなく例えば９０°
方向に設けることで、セメントペーストを補足注入する
際にロックボルトを削孔穴のセンターからずらせて注入
口部を広くすることができ、注入作業が容易になる。As shown in FIG. 6, a spacer portion 4e having an overhanging width that is substantially the same as or slightly smaller than the inner diameter of the drilled hole is integrally provided at least at two locations on the straight portion of the lower portion of the sheath 4 so that the sheath 4 is locked. It is possible to center the hole at the same time when it is installed in. Spacer part 4
As shown in FIG. 6, e is not 90 degrees, but 90 degrees, for example.
When the cement paste is additionally injected, the lock bolt can be displaced from the center of the drilled hole to widen the injection port by providing the cement paste in the direction, and the injection work becomes easy.
【００２２】球面ナット１及び球面座金２の凹凸とし
て、図３には球面ナット１側に凸球座面をまた球面座金
２側に凹球座面を形成した場合を示したが、凹凸の関係
はこれとは逆であってもよい。As the unevenness of the spherical nut 1 and the spherical washer 2, FIG. 3 shows a case where a convex spherical seat surface is formed on the spherical nut 1 side and a concave spherical seat surface is formed on the spherical washer 2 side. May be the opposite.
【００２３】[0023]
【発明の効果】本発明によれば、シースに台座部材を後
付できる構成になっているので、シースの取り付け時の
作業性を改善できると共にセメントモルタルの養生硬化
後のやせ具合を目視確認できるので、シース下端領域の
差込埋設に不具合が生じている場合にはこれをセメント
モルタルの補充充填により容易に修正でき、施工性はも
とより水封対策にも優れる法面のロックボルト施工法及
びロックボルト頭部の水封緊締構造を提供できる。According to the present invention, since the pedestal member can be retrofitted to the sheath, the workability at the time of attaching the sheath can be improved and the thinning condition of the cement mortar after curing and curing can be visually confirmed. Therefore, if there is a problem in the insertion embedding in the lower end area of the sheath, it can be easily corrected by refilling with cement mortar, and it is excellent not only in workability but also in water sealing measures. A water seal tightening structure for the bolt head can be provided.
【図１】本発明施工法の第１工程終了時の状況を示す説
明図である。FIG. 1 is an explanatory view showing the situation at the end of the first step of the construction method of the present invention.
【図２】同、第２工程終了時の状況を示す説明図であ
る。FIG. 2 is an explanatory diagram showing a situation at the end of the second step.
【図３】同、第３、４及び５工程終了時の状況を示す説
明図である。FIG. 3 is an explanatory diagram showing a situation at the end of the third, fourth and fifth steps.
【図４】ロックボルトの好ましい一例を示す断面図であ
る。FIG. 4 is a sectional view showing a preferred example of a lock bolt.
【図５】シースの好ましい一例を示す底面図である。FIG. 5 is a bottom view showing a preferred example of the sheath.
【図６】シースの好ましい一例を示す断面図である。FIG. 6 is a sectional view showing a preferred example of a sheath.
【図７】従来の水封緊締構造の一例を示す説明図であ
る。FIG. 7 is an explanatory diagram showing an example of a conventional water seal tightening structure.
１ 球面ナット ２ 球面座金 ２ａ 傾斜面 ３ 台座部材 ４ シース ４ａ 突出部 ４ｂ 爪部 ４ｃ 蛇腹部 ４ｄ 周溝 ４ｅ スペーサー部 ５ シールリング ６ ロックボルト ６ａ 定着用部 ６ｂ 自由用部 ６ｃ 頭部 ６ｄ フラット部 ６ｅ ねじ部 ７ 防錆材 ８ 保護キャップ 1 spherical nut 2 spherical washer 2a inclined surface 3 base member 4 sheath 4a protrusion 4b claw 4c bellows 4d circumferential groove 4e Spacer part 5 seal ring 6 Rock bolt 6a Fixing section 6b Free part 6c head 6d flat part 6e screw part 7 Rust prevention material 8 protective cap
Claims (7)
孔穴内に打設されたセメントペースト内にシースなしの
裸のロックボルトの定着用部を挿入すると共に該ボルト
の頭部を法面上方に突出させる第１工程、上記ロックボ
ルトの頭部を通じその外周りに嵌挿された上端鍔なしの
シースの下部領域を上記ペースト内に挿入すると共に上
部領域を法面より上方に突出させる第２工程、上記ペー
ストを養生硬化させた後に、台座部材をその中央部の取
り付け穴において上記シースの外回りに嵌め通し、法面
上に設置する第３工程、上記台座部材より上方位置でシ
ースの上端部の外周りに弾性シールリングを嵌装し取り
付ける第４工程、上記ロックボルトの頭部に球面座金及
び球面ナットを取り付け、上記ナットの緊締によりロッ
クボルトに緊張を与えると共にシールリングを球面座
金、台座部材及びシースの間で狭圧保持することにより
上記シースの上端部の外回りに水封を施す第５工程、を
含むことを特徴とする法面へのロックボルト施工法。1. A bare rock bolt fixing portion without a sheath is inserted into a cement paste placed in a drilling hole for inserting a rock bolt formed on a slope and a head portion of the bolt is cut by a method. First step of projecting upward from the surface, inserting the lower region of the sheath without an upper flange, which is fitted around the head through the head of the lock bolt, into the paste and project the upper region above the slope. Second step, after the paste is cured and hardened, the pedestal member is fitted around the outer periphery of the sheath in the attachment hole at the central portion thereof, and is installed on the slope. The fourth step of fitting and attaching an elastic seal ring around the outer periphery of the upper end, attach a spherical washer and spherical nut to the head of the lock bolt, and tighten the nut to tighten the lock bolt. And a sealing ring is held between the spherical washer, the pedestal member, and the sheath under a narrow pressure to provide a water seal around the outer periphery of the upper end portion of the sheath, and the lock bolt to the slope. Construction method.
端部の内周面に内方突出の少なくとも１つの爪部を有す
るシースが適用され、シース下部領域のセメントペース
ト内への挿入時には爪部がロックボルトの短径側の両側
部に位置しており、挿入後に、シースを中心軸線周りの
方向に回転して爪部をロックボルトの長径側両側部に移
動し該両側部に形成のねじ部に係止させることを特徴と
する請求項１記載のロックボルト施工法。2. A lock bolt having an elliptical or oval cross section and a sheath having at least one inwardly projecting claw portion on the inner peripheral surface of the lower end portion are applied, and the claw is inserted when the sheath lower region is inserted into the cement paste. The parts are located on both sides of the lock bolt on the minor axis side, and after insertion, the sheath is rotated in the direction around the central axis to move the claw part to both sides of the lock bolt on the major axis side, and the claws are formed on both sides. The method for constructing a lock bolt according to claim 1, wherein the lock bolt is engaged with a screw portion.
される緊締構造であって、シースなしの裸のロックボル
ト、上端鍔なしのシース、台座部材、弾性シールリン
グ、球面座金及び球面ナットを含み、上記ロックボルト
は法面に形成の削孔穴内に打設のセメントペーストの養
生硬化層内に定着用部において挿着固定されており、上
記シースは上記ロックボルトの自由用部の外回りを覆っ
た状態で下部領域が上記養生硬化層内に埋設固定され上
部領域が法面より上方に突出されており、台座部材はそ
の中央部取り付け穴において上記シースの上端フランジ
なし部を通過して法面上に設置されており、弾性シール
リングは上記台座部材より上方へ突出するシースの上端
部の外回りに嵌装されており、球面座金及び球面ナット
は上記ロックボルトの頭部に取り付けられており、ロッ
クボルトには上記ナットの緊締により緊張が与えられて
いて、この緊張状態下で、シールリングは球面座金、台
座部材及びシースの間で狭圧保持され、このシールリン
グの狭圧保持によりシースの上端部の外回りに水封が施
されていることを特徴とするロックボルト頭部の緊締構
造。3. A tightening structure applied to the lock bolt construction method according to claim 1, wherein a bare rock bolt without a sheath, a sheath without an upper flange, a pedestal member, an elastic seal ring, a spherical washer and a spherical nut. The lock bolt is inserted and fixed at a fixing portion in a curing hardening layer of cement paste placed in a hole formed on a slope, and the sheath is an outer circumference of a free portion of the lock bolt. The lower region is embedded and fixed in the curing layer while the upper region is projected above the slope, and the pedestal member passes through the upper end flangeless portion of the sheath in its central mounting hole. It is installed on the slope, the elastic seal ring is fitted around the upper end of the sheath protruding upward from the pedestal member, and the spherical washer and spherical nut are the lock bolts. It is attached to the head, and the lock bolt is tensioned by tightening the nut, and under this tension, the seal ring is held under a narrow pressure between the spherical washer, the pedestal member and the sheath. The tightening structure of the lock bolt head is characterized in that a water tight seal is provided around the upper end of the sheath by holding the ring in a narrow pressure.
ていて短径側の両側部にフラット部をまた長径側の両側
部にねじ部を備え、一方シースは下端部の内周面に内方
突出の少なくとも１つの爪部を備え、爪部をフラット部
に位置させたときは、シースはロックボルトへの嵌挿状
態においてロックボルトの軸方向に移動自在であり、シ
ースを中心軸線周りの方向に回転させ爪部をフラット部
からねじ部に移動させたときは、爪部がねじ部に係止し
シースを軸方向の移動位置で拘束できる構成になってい
ることを特徴とする請求項３記載の緊締構造。4. The lock bolt has an elliptical or oval cross section and has flat portions on both sides on the minor diameter side and threaded portions on both sides on the major diameter side, while the sheath is formed on the inner peripheral surface of the lower end portion. When at least one claw portion protruding inward is provided, and the claw portion is located in the flat portion, the sheath is movable in the axial direction of the lock bolt when fitted in the lock bolt, and the sheath is movable around the central axis line. When the claw portion is rotated in the direction of to move the claw portion from the flat portion to the screw portion, the claw portion is locked to the screw portion and the sheath can be restrained at the axial movement position. Item 3. The tightening structure according to item 3.
え、ナットの緊締時に、該傾斜部を介しシールリングを
保有弾性に抗し台座部材並びにシースに対し押しつける
ことができる構成になっていることを特徴とする請求項
３または４記載の緊締構造。5. The spherical washer is provided with an inclined portion on the inner peripheral surface of the lower end portion, and when the nut is tightened, the seal ring can be pressed against the pedestal member and the sheath through the inclined portion against the resilience. The tightening structure according to claim 3 or 4, wherein
を嵌め止めるための周溝を、また周溝より下方の位置に
伸縮および屈曲自在部を備えていることを特徴とする請
求項３乃至５のいずれかに記載の緊締構造。6. The sheath comprises a peripheral groove for fitting a seal ring on the outer peripheral surface of the upper end portion, and an expandable / contractible portion at a position lower than the peripheral groove. The tightening structure according to any one of 1 to 5.
のスペーサー部を備えていることを特徴とする請求項３
乃至６のいずれかに記載の緊結構造。7. The sheath includes a spacer portion for centering the drilled hole.
The tightly bound structure according to any one of 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002129388A JP3968510B2 (en) | 2002-03-26 | 2002-03-26 | Lock bolt construction method on the slope and tightening structure of the lock bolt head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002129388A JP3968510B2 (en) | 2002-03-26 | 2002-03-26 | Lock bolt construction method on the slope and tightening structure of the lock bolt head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003278153A true JP2003278153A (en) | 2003-10-02 |
| JP3968510B2 JP3968510B2 (en) | 2007-08-29 |
Family
ID=29243941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002129388A Expired - Fee Related JP3968510B2 (en) | 2002-03-26 | 2002-03-26 | Lock bolt construction method on the slope and tightening structure of the lock bolt head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3968510B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7434058B2 (en) | 2019-05-23 | 2024-02-20 | 中央開発株式会社 | Guide pipe support device |
-
2002
- 2002-03-26 JP JP2002129388A patent/JP3968510B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7434058B2 (en) | 2019-05-23 | 2024-02-20 | 中央開発株式会社 | Guide pipe support device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3968510B2 (en) | 2007-08-29 |
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