JP6543398B1

JP6543398B1 - Tendon's head anchoring structure

Info

Publication number: JP6543398B1
Application number: JP2018169744A
Authority: JP
Inventors: 明野口
Original assignee: 弘和産業株式会社
Priority date: 2018-09-11
Filing date: 2018-09-11
Publication date: 2019-07-10
Anticipated expiration: 2038-09-11
Also published as: JP2020041337A

Abstract

【課題】施工時融通性に優れ、テンドンの頭部に設けられる荷重調整代に損傷を与えることなく適切な位置合わせを容易に行うことができ、施工に必要とされる十分な荷重調整代を設けることができるテンドンの頭部定着構造を提供する。
【解決手段】テンドン２が挿通される筒部材１を備える。テンドンと筒部材の相対移動が可能とされ、筒部材の外周にネジ溝１２が形成される。筒部材の一端にテンドンの一部を保持するヘッド部材が当接し、又は、筒部材の一端でテンドンの一部が保持される。筒部材の外周に嵌装されネジ溝に螺合するナット部材３が支圧板６に当接する。筒部材は支圧板を貫通してもよい。
【選択図】図１An object of the present invention is to provide excellent flexibility in construction and to easily perform proper alignment without damaging a load adjustment allowance provided on a tendon head, and a sufficient load adjustment allowance required for construction. To provide a tendon head anchoring structure that can be provided.
A cylindrical member (1) through which a tendon (2) is inserted is provided. The relative movement of the tendon and the cylindrical member is enabled, and the screw groove 12 is formed on the outer periphery of the cylindrical member. One end of the cylindrical member abuts against a head member holding a part of the tendon, or one end of the cylindrical member holds a part of the tendon. A nut member 3 fitted on the outer periphery of the cylindrical member and screwed into a screw groove abuts on the pressure bearing plate 6. The cylindrical member may penetrate the bearing plate.
[Selected figure] Figure 1

Description

本発明は、地すべりなどを防止するための、斜面・のり面の地山安定対策工に使用されるグラウンドアンカー工法において、グラウンドアンカー（以下、テンドンという）の頭部を地山に定着させる構造に関するものである。 The present invention relates to a structure for fixing the head of a ground anchor (hereinafter referred to as "tendon") to a ground in a ground anchor method used for ground and earth stability measures for slopes and slopes to prevent landslides and the like. It is a thing.

グラウンドアンカー工法では、頭部、自由長部、及びアンカー体で構成されるテンドン（テンドン引張材、或いはストランドと称される場合もある）が用いられる。 In the ground anchor method, a tendon (sometimes referred to as a tendon tensile material or a strand) composed of a head, a free length, and an anchor body is used.

アンカー体は、セメントグラウトの注入でテンドンを地山に固定する機能を有する。また、自由長部は、テンドンを伸縮可能なフリーな状態とするための部位である。 The anchor body has a function of fixing the tendon to the ground by injecting cement grout. Further, the free length portion is a portion for making the tendon free to be expanded and contracted.

頭部は、テンドンを地山表面で、のり枠や受圧板などの受圧構造物に定着させるための部位である。テンドンをジャッキにて緊張させ、アンカーヘッドやくさびなどの冶具を用いて、受圧構造物に定着させる。なお、頭部が受圧構造物に定着された状態において、テンドンには引張力が作用した状態となる。そして、当該引張力は、その反力として地山に圧縮力を作用させることから、地すべりなどの不安定挙動を抑止できる。 The head is a portion for fixing the tendon on the ground surface to a pressure receiving structure such as a frame or a pressure receiving plate. The tendon is tightened with a jack and fixed to the pressure receiving structure using a jig such as an anchor head or a wedge. When the head is fixed to the pressure receiving structure, a tensile force is applied to the tendon. And since the said tensile force makes a ground work a compressive force as a reaction force, unstable behaviors, such as landslide, can be suppressed.

テンドンの頭部を受圧構造物に定着させる構造としては、例えば、特開平１１−１８１７６８号公報に開示されている構造（以下、圧着グリップネジ定着型とする）が知られている。この圧着グリップネジ定着型では、外周部にネジ溝が刻設された筒状の剛性な耐荷体（以下、マンションとする）をテンドンの頭部に圧着させ、マンションの外周に嵌装された定着ナット及び定着ナットと受圧構造物の間に配置される支圧板（アンカープレート）を介して受圧構造物に頭部が定着される。また、定着ナットとマンションは螺合しているため、定着ナットの位置を調整することにより引張力を調整することができる。 As a structure for fixing the head of a tendon to a pressure receiving structure, for example, a structure disclosed in Japanese Patent Application Laid-Open No. 11-181768 (hereinafter referred to as a crimp grip screw fixing type) is known. In this crimp grip screw fixing type, a cylindrical rigid load carrying body (hereinafter referred to as an apartment) in which a thread groove is formed on the outer peripheral portion is crimped onto the head of a tendon, and the fixing is fitted on the outer periphery of the apartment The head is fixed to the pressure receiving structure via a pressure plate (an anchor plate) disposed between the nut and the fixing nut and the pressure receiving structure. Further, since the fixing nut and the apartment are screwed together, the tensile force can be adjusted by adjusting the position of the fixing nut.

一方、別の構造として、例えば、実公平７−２５３６４号公報に開示されている構造（以下、リング付くさびアンカーヘッド定着型とする）が知られている。このリング付くさびアンカーヘッド定着型では、外周に雄ねじが形成され、くさび挿入可能なテーパー状の開口部を有する鋼材挿通孔を貫通させた円盤状の定着体（以下、アンカーヘッドとする）とくさびを使用し、アンカーヘッド及びアンカーヘッドと受圧構造物の間に配置される支圧板を介して受圧構造物に頭部を定着させることができる。また、アンカーヘッドの外周に螺合するナット体の位置を調整することにより引張力を調整することができる。 On the other hand, as another structure, for example, a structure disclosed in Japanese Utility Model Application Publication No. 7-25364 (hereinafter, referred to as a wedge anchor head fixing type with a ring) is known. In this wedge anchor head fixing type with a ring, a disc-like fixing body (hereinafter referred to as anchor head) and a wedge in which a male screw is formed on the outer periphery and a steel insertion hole having a tapered opening which can be wedged inserted The head can be anchored to the pressure receiving structure via the anchor head and a bearing plate disposed between the anchor head and the pressure receiving structure. Further, the tensile force can be adjusted by adjusting the position of the nut body screwed to the outer periphery of the anchor head.

特開平１１−１８１７６８号公報Unexamined-Japanese-Patent No. 11-181768 gazette 実公平７−２５３６４号公報Japanese Utility Model 7-25364

圧着グリップネジ定着型は、引張力の荷重調整代を大きく取ることができる利点がある。しかしながら、生産工場にて自由長部の長さが固定されて製造されるため、建設現場での施工時に安定対策用の地すべり面が変化した場合には、それに対応させることが難しかった。すなわち、施工時融通性に劣っていた。 The crimp grip screw fixing type has an advantage that a large load adjustment allowance of tensile force can be taken. However, since the length of the free length part is fixed and manufactured in a production factory, when the landslide surface for a stabilization measure changed at the time of construction at a construction site, it was difficult to cope with it. That is, it was inferior to the flexibility at the time of construction.

また、剛性な耐荷体であるマンションを、削孔と受圧構造物の孔が開口する方向に沿って、その向きを調整することが極めて難しく、位置合わせ作業に手間と時間を要していた。更に、油圧ジャッキなどを使用して緊張定着作業を行うと、自由長には伸びが発生する。そして、初期にマンションを設置した位置が地上側へ移動し支圧板と擦れると、マンション外周に形成されたネジ溝が損傷し、定着ナットの嵌装が困難になる場合があった。更にまた、テンドンの設置が完了した状態において、また自由長の伸びは長さや地質条件によって変化し一定ではない場合もある為、ロングマンションなどを使用するとマンション部が地中で露出し、地中に配置される部位は、十分な防錆処理が施されていないと、腐食による問題を引き起こす場合があった。 In addition, it is extremely difficult to adjust the direction of the apartment, which is a rigid load-bearing body, along the direction in which the drilling and holes of the pressure receiving structure are opened, and it takes time and effort for alignment work. Furthermore, if a tension fixing operation is performed using a hydraulic jack or the like, the free length is stretched. And if the position which installed the apartment in the early stage moves to the ground side and rubs with a bearing board, the thread groove formed in the apartment perimeter might be damaged, and fitting of a fixing nut might become difficult. Furthermore, when tendon installation is completed, the growth of free length may change depending on the length and geology conditions and may not be constant. Therefore, using a long apartment etc., the apartment part is exposed in the ground, and underground The part to be placed in may not cause sufficient corrosion resistance, which may cause problems due to corrosion.

一方、リング付くさびアンカーヘッド定着型では、これらの問題は生じないものの、引張力の荷重調整代を大きくすると、アンカーヘッドの外周に嵌装されるナット体の長さ寸法が大きくなり、受圧構造物からの突出部分が大きくなってしまう。そのため、荷重調整代を、あまり大きくできないという問題がある。 On the other hand, in the wedge anchor head fixing type with a ring, these problems do not occur, but if the load adjustment allowance of the tensile force is increased, the length dimension of the nut body fitted on the outer periphery of the anchor head becomes large and the pressure receiving structure The protrusion from the object will be large. Therefore, there is a problem that the load adjustment allowance can not be made too large.

そこで、本発明は、施工時融通性に優れ、適切な位置合わせを容易に行うことができ、テンドンの頭部に設けられる荷重調整代に損傷を与えることなく、施工に必要とされる十分な荷重調整代を設けることができるテンドンの頭部定着構造を提供することを目的とする。 Therefore, the present invention is excellent in construction flexibility, can easily perform appropriate alignment, and is sufficient for construction without damaging the load adjustment margin provided on the head of the tendon. An object of the present invention is to provide a tendon head fixing structure which can be provided with a load adjustment allowance.

本発明に係る第一のテンドンの頭部定着構造は、テンドンが挿通され、外径が支圧板の貫通孔の内径より小さい筒部材を備え、前記テンドンと前記筒部材の相対移動が可能とされ、前記筒部材の外周にネジ溝が形成され、前記筒部材の一端に前記テンドンのＰＣ鋼より線の任意の位置に固定されたヘッド部材が当接し、前記筒部材の外周に嵌装され前記ネジ溝に螺合するナット部材が前記支圧板に当接する。 The head fixing structure of the first tendon according to the present invention includes a cylindrical member through which the tendon is inserted and whose outer diameter is smaller than the inner diameter of the through hole of the bearing plate, and relative movement between the tendon and the cylindrical member is enabled. A screw groove is formed on the outer periphery of the cylindrical member, and a head member fixed at an arbitrary position of the PC steel strand of the tendon abuts on one end of the cylindrical member and is fitted on the outer periphery of the cylindrical member nut member screwed to the screw groove is brought into contact with the bearing capacity plate.

前記筒部材が前記支圧板を貫通していてもよい。 The cylinder member may penetrate the bearing plate.

本発明に係る第二のテンドンの頭部定着構造は、テンドンが挿通され、外径が支圧板の貫通孔の内径より小さい筒部材を備え、前記テンドンと前記筒部材の相対移動が可能とされ、前記筒部材の外周にネジ溝が形成され、前記筒部材の一端が前記テンドンのＰＣ鋼より線の任意の位置に固定され、前記筒部材の外周に嵌装され前記ネジ溝に螺合するナット部材が前記支圧板に当接し、前記筒部材が前記支圧板を貫通している。 The head fixing structure of the second tendon according to the present invention has a cylindrical member through which the tendon is inserted and whose outer diameter is smaller than the inner diameter of the through hole of the bearing plate, and relative movement between the tendon and the cylindrical member is enabled. A screw groove is formed on the outer periphery of the cylindrical member, one end of the cylindrical member is fixed to an arbitrary position of the PC steel strand of the tendon, and is fitted on the outer periphery of the cylindrical member and screwed into the screw groove nut member abuts against the bearing capacity plate, wherein the tubular member extends through the bearing capacity plate.

本発明に係る第一のテンドンの頭部定着構造によれば、テンドンに引張力が作用する状態で、その一部をヘッド部材で保持することにより、ヘッド部材、筒部材、ナット部材及び支圧板を介し受圧構造物にテンドンを定着させることができる。また、テンドンが定着した状態で、ナット部材の筒部材に対する位置を調整することにより、テンドンに作用する引張力を調整することができる。 According to the head fixing structure of the first tendon according to the present invention, the head member, the cylindrical member, the nut member and the bearing plate are held by holding a part of the tendon by the head member in a state where the tensile force acts on the tendon. Can fix the tendon to the pressure receiving structure. Moreover, the tensile force which acts on a tendon can be adjusted by adjusting the position with respect to the cylinder member of a nut member in the state which tendon fixed.

更に、テンドンと筒部材の相対移動が可能とされているため、安定対策用の地すべり面が変化した場合にも、テンドンの受圧構造物に定着される部位を自由に調整することができる。すなわち、施工時融通性に優れたものとなる。 Furthermore, since the relative movement of the tendon and the cylindrical member is enabled, even when the landslide surface for the stabilization is changed, the portion fixed to the pressure receiving structure of the tendon can be freely adjusted. That is, the flexibility at the time of construction is excellent.

更にまた、テンドンの、受圧構造物の開口部に配置される部位を剛性な耐荷体であるマンションとする必要はなく、位置合わせ作業を容易に行える柔軟性を持たせることができ、テンドンを孔内へ挿入した後に筒部材を設置出来ることから、筒部材の外周に形成されたネジ溝が破損するおそれがない。 Furthermore, it is not necessary to make a portion of the tendon located at the opening of the pressure receiving structure into a condominium that is a rigid load bearing member, and it can have flexibility to facilitate alignment work, and the tendon can be made into holes Since the cylindrical member can be installed after being inserted into the inside, there is no possibility that the screw groove formed on the outer periphery of the cylindrical member will be damaged.

更にまた、筒部材の長さ寸法を大きくとることにより引張力の荷重調整代を大きくすることができ、ナット部材よりも径の小さい筒部材のみが受圧構造物から突出することになるため、引張力の荷重調整代を大きくしても受圧構造物からの突出部分を小さく抑えることができる。 Furthermore, by increasing the length dimension of the cylindrical member, the load adjustment allowance of the tensile force can be increased, and only the cylindrical member having a diameter smaller than that of the nut member protrudes from the pressure receiving structure. Even if the load adjustment margin of force is increased, the protruding portion from the pressure receiving structure can be kept small.

従って、本発明に係る第一のテンドンの頭部定着構造は、施工時融通性に優れたものとなり、テンドンの頭部に設けられる荷重調整代に損傷を与えることなく適切な位置合わせを容易に行うことができ、施工に必要とされる十分な荷重調整代を設けることができる。 Therefore, the first tendon head fixing structure according to the present invention is excellent in construction flexibility, and facilitates appropriate alignment without damaging the load adjustment margin provided on the tendon head. It can be carried out and can provide a sufficient load adjustment allowance required for construction.

筒部材が支圧板を貫通していてもよく、この場合、荷重調整代を大きく取りながら、受圧構造物からの突出部分を更に小さく抑えることができる。 The cylindrical member may penetrate through the bearing plate, and in this case, the projecting portion from the pressure receiving structure can be further reduced while taking a large load adjustment margin.

筒部材が支圧板を貫通する場合に地中側に配置される部位は、腐食による問題の発生を防止するため、防錆処理を施しておくことが好ましいところ、地中側に配置される部位は設計により予め決めることができる。そのため、マンションの地中側に配置される部位が定まっていない、従来の圧着グリップネジ定着型と比較し、より適切な防錆処理を効率よく施すことができる。また、防錆処理を必要としないステンレス等の錆びない素材を使用する場合には、適切な長さとすることによりコストの低減を図ることも出来る。 In order to prevent the occurrence of problems due to corrosion when the cylindrical member penetrates the bearing plate, in order to prevent the occurrence of problems due to corrosion, it is preferable to apply anti-corrosion treatment; Can be predetermined by design. Therefore, as compared with the conventional crimped grip screw fixing type in which the portion to be disposed on the underground side of the apartment is not determined, more appropriate anticorrosion treatment can be performed efficiently. In addition, when using a non-rusting material such as stainless steel which does not require an anticorrosion treatment, the cost can be reduced by setting the length appropriately.

本発明に係る第二のテンドンの頭部定着構造によれば、テンドンに引張力が作用する状態で、その一部を筒部材で保持することにより、筒部材、ナット部材及び支圧板を介し受圧構造物にテンドンを定着させることができる。また、テンドンが定着した状態で、ナット部材の筒部材に対する位置を調整することにより、テンドンに作用する引張力を調整することができる。 According to the head fixing structure of the second tendon according to the present invention, by holding a part of the tendon by the cylindrical member in a state where the tensile force acts on the tendon, the pressure is received via the cylindrical member, the nut member and the bearing plate. The structure can be anchored with tendon. Moreover, the tensile force which acts on a tendon can be adjusted by adjusting the position with respect to the cylinder member of a nut member in the state which tendon fixed.

そして、第一のテンドンの頭部定着構造と同様に、施工時融通性に優れたものとなり、テンドンの頭部に設けられる荷重調整代に損傷を与えることなく適切な位置合わせを容易に行うことができ、施工に必要とされる十分な荷重調整代を設けることができる。 And, as with the head fixing structure of the first tendon, the construction flexibility is excellent, and the appropriate alignment can be easily performed without damaging the load adjustment allowance provided on the tendon's head. And can provide a sufficient load adjustment allowance required for construction.

本発明に係るテンドンの頭部定着構造の実施形態を示す縦断面図である。It is a longitudinal section showing an embodiment of a head fixing structure of a tendon according to the present invention. 本発明に係るテンドンの頭部定着構造の他の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows other embodiment of the head fixing structure of the tendon which concerns on this invention. 本発明に係るテンドンの頭部定着構造の他の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows other embodiment of the head fixing structure of the tendon which concerns on this invention. 本発明に係るテンドンの頭部定着構造の他の実施形態を示す縦断面図である。It is a longitudinal cross-sectional view which shows other embodiment of the head fixing structure of the tendon which concerns on this invention.

図１を参照しながら、本発明に係るテンドンの頭部定着構造の実施形態を説明する。
図１に示す頭部定着構造は、テンドン２が挿通される筒部材１を備える。なお、図１には、筒部材１の縦断面が示されているが、図示の便宜上、筒部材１の断面を意味するハッチングは省略さている。 An embodiment of a tendon head fixing structure according to the present invention will be described with reference to FIG.
The head fixing structure shown in FIG. 1 includes a cylindrical member 1 into which the tendon 2 is inserted. In addition, although the longitudinal cross section of the cylinder member 1 is shown by FIG. 1, the hatching which means the cross section of the cylinder member 1 is abbreviate | omitted for convenience of illustration.

筒部材１は、挿通されるテンドン２の外径よりも大きい内径の貫通孔１１を有し、テンドン２と筒部材１の相対移動が可能とされている。 The cylindrical member 1 has a through hole 11 with an inner diameter larger than the outer diameter of the tendon 2 to be inserted, and relative movement of the tendon 2 and the cylindrical member 1 is enabled.

筒部材１の外周にはネジ溝１２が形成され、このネジ溝１２に螺合するナット部材３が、筒部材１の外周に嵌装されている。 A screw groove 12 is formed on the outer periphery of the cylindrical member 1, and a nut member 3 screwed into the screw groove 12 is fitted on the outer periphery of the cylindrical member 1.

筒部材１の一方の端面には、貫通孔１１よりも径の大きい凹陥部１３が設けられている。そして、凹陥部１３の内側面に適合する輪郭を有する楔受部材４が、凹陥部１３に嵌装されている。 A recess 13 having a diameter larger than that of the through hole 11 is provided on one end surface of the cylindrical member 1. And the wedge-receiving member 4 which has an outline fitted to the inner surface of the recess 13 is fitted in the recess 13.

楔受部材４は、凹陥部１３に嵌装された状態において、凹陥部１３に対峙する面が凹陥部１３の底面全体で当接するものとなっている。また、凹陥部１３に嵌装された状態において、筒部材１の貫通孔１１に連通し、テンドン２が挿通される貫通孔４１を有している。 The wedge receiving member 4 is in contact with the entire bottom surface of the recessed portion 13 in a state in which the wedge receiving member 4 is fitted in the recessed portion 13. Further, in the state of being fitted in the recessed portion 13, there is a through hole 41 which communicates with the through hole 11 of the cylindrical member 1 and into which the tendon 2 is inserted.

楔受部材４の貫通孔４１は、筒部材１の貫通孔１１に連通しない側で、筒部材１の貫通孔１１の径よりも大きく開口している。そして、貫通孔４１の大きい開口側の端部は、開口から貫通孔１１側に向かって縮径し、円錐台形の定着楔５を受け入れることが可能な形状とされた楔受口４２となっている。なお、この実施形態では、楔受部材４と定着楔５が、本発明のヘッド部材を構成している。 The through hole 41 of the wedge receiving member 4 is larger than the diameter of the through hole 11 of the cylindrical member 1 on the side which does not communicate with the through hole 11 of the cylindrical member 1. Then, the large opening end of the through hole 41 is reduced in diameter from the opening toward the through hole 11 to form a weir receiving hole 42 having a shape capable of receiving the fixing rod 5 having a truncated cone shape. There is. In this embodiment, the wedge receiving member 4 and the fixing wedge 5 constitute the head member of the present invention.

定着楔５は、同じ形状の二つの楔構成部材５１、５１で構成されている。これら楔構成部材５１、５１の夫々には、テンドン２の外周に適合する形状の凹陥部が設けられており、この凹陥部をテンドン２の外周に当てがい、楔構成部材５１、５１でテンドン２を挟持することにより、テンドン２の外周に定着楔５が配置された状態となる。そして、定着楔５を楔受部材４の楔受口４２に嵌め込むことにより、緊張された状態にあるテンドン２を固定するものとなっている。 The fixing rod 5 is composed of two rod components 51, 51 of the same shape. Each of the weir components 51, 51 is provided with a recess having a shape that conforms to the outer periphery of the tendon 2, and this recess is applied to the outer periphery of the tendon 2. As a result, the fixing rod 5 is disposed on the outer periphery of the tendon 2. Then, the fixing rod 5 is fitted into the rod receiving port 42 of the rod receiving member 4 to fix the tendon 2 in a tensioned state.

テンドン２を使用したグラウンドアンカー工の対象となる斜面の地山表面には、図示しない受圧構造物が設置されている。そして、受圧構造物の表面に支圧板６が配置されている。なお、図１には、支圧板６の断面が示されているが、図示の便宜上、支圧板６の断面を意味するハッチングは省略さている。 A pressure receiving structure (not shown) is installed on the ground surface of the slope to be ground anchored using the tendon 2. The bearing plate 6 is disposed on the surface of the pressure receiving structure. In addition, although the cross section of the bearing plate 6 is shown by FIG. 1, the hatching which means the cross section of the bearing plate 6 is abbreviate | omitted for convenience of illustration.

支圧板６には、テンドン２が挿通される貫通孔６１が設けられ、筒部材１の外径は、支圧板６の貫通孔６１の内径より小さいものとされている。また、筒部材１の外周に嵌装されたナット部材３が支圧板６の上面に当接し、テンドン２の頭部が、定着楔５、楔受部材４、筒部材１、ナット部材３及び支圧板６を介し受圧構造物に定着された状態となっている。 The bearing plate 6 is provided with a through hole 61 through which the tendon 2 is inserted, and the outer diameter of the cylindrical member 1 is smaller than the inner diameter of the through hole 61 of the bearing plate 6. Further, a nut member 3 fitted on the outer periphery of the cylindrical member 1 abuts on the upper surface of the bearing plate 6, and the head of the tendon 2 is a fixing rod 5, a wedge receiving member 4, a cylindrical member 1, a nut member 3 and a support The pressure receiving structure is fixed via the pressure plate 6.

次に、この定着構造を採用したグラウンドアンカー工法の施工手順を説明する。
まず、テンドン２の図示しないアンカー体を造成する。すなわち、テンドンを地山に形成された削孔に挿入し、そこにセメントグラウトを注入し固化させ、地山に固結する。 Next, the construction procedure of the ground anchor method which adopted this fixing structure is explained.
First, an unshown anchor body of tendon 2 is created. That is, tendon is inserted into a drilled hole formed in the ground, cement grout is injected and solidified there, and the ground is consolidated.

地山への固結作業完了後、テンドン２の位置合わせを行い、テンドン２が削孔の軸線に重なる配置とする。そして、位置合わせ作業完了後、筒部材１をテンドン２に押し込み、テンドン２を支圧板６の貫通孔６１に挿通させる。また、ナット部材３を筒部材１の外周に嵌装し、受圧構造物の表面に配置された受圧板６に当接した状態にする。更に、楔受部材４を筒部材１の凹陥部１３に嵌装する。 After completion of the consolidation work on the ground, the tendon 2 is aligned, and the tendon 2 is placed so as to overlap the drilling axis. Then, after the alignment work is completed, the cylindrical member 1 is pushed into the tendon 2, and the tendon 2 is inserted into the through hole 61 of the bearing plate 6. Further, the nut member 3 is fitted on the outer periphery of the cylindrical member 1 so as to be in contact with the pressure receiving plate 6 disposed on the surface of the pressure receiving structure. Further, the wedge receiving member 4 is fitted into the recessed portion 13 of the cylindrical member 1.

続いて、緊張用ジャッキでテンドン２を引っ張り、定着楔５をテンドン２の外周に配置する。そして、テンドン２の引っ張り力を弱めて定着楔５を楔受部材４の楔受口４２に嵌装することにより、テンドン２の頭部が受圧構造物に定着した定着構造となすことができる。 Subsequently, the tendon 2 is pulled with a tension jack, and the fixing rod 5 is disposed on the outer periphery of the tendon 2. Then, the tensile force of the tendon 2 is reduced to fit the fixing rod 5 into the receiving hole 42 of the receiving member 4 so that the fixing structure in which the head of the tendon 2 is fixed to the pressure receiving structure can be obtained.

なお、テンドン２を定着させた後、定着楔５から長く突出したテンドン２の端部は短く切断し、図示しない蓋部材を被せておくことが好ましい。この場合、定着構造の防食を図ることができる。なお、蓋部材の内部にグリス等の防錆材を充填しておくことにより、防食効果を更に高めることができる。 In addition, after fixing the tendon 2, it is preferable that the end of the tendon 2 protruding long from the fixing crucible 5 be cut short and a cover member not shown be covered. In this case, corrosion protection of the fixing structure can be achieved. The anticorrosion effect can be further enhanced by filling the inside of the lid member with a rustproofing material such as grease.

テンドン２が定着した状態において、筒部材１が荷重調整代として機能する。そして、ナット部材３の筒部材１に対する位置を調整することにより、テンドン２に作用する引張力を調整することができる。 In the state where the tendon 2 is fixed, the cylindrical member 1 functions as a load adjustment margin. And the tensile force which acts on the tendon 2 can be adjusted by adjusting the position with respect to the cylinder member 1 of the nut member 3.

この実施形態によれば、テンドン２が定着した状態で、ナット部材３の筒部材１に対する位置を調整することにより、テンドン２に作用する引張力を調整することができる。また、テンドン２に対し定着楔５を配置する部位は、建設現場での施工時に安定対策用の地すべり面の変化に対応させることができる。従って、施工融通性に優れている。 According to this embodiment, the tensile force acting on the tendon 2 can be adjusted by adjusting the position of the nut member 3 with respect to the cylindrical member 1 in a state where the tendon 2 is fixed. Moreover, the site | part which arrange | positions the fixing rod 5 with respect to the tendon 2 can be made to respond | correspond to the change of the landslide surface for stability measures at the time of construction in a construction site. Therefore, it is excellent in construction flexibility.

また、この実施形態によれば、テンドン２の定着に利用されるヘッド部材（楔受部材４と定着楔５）をテンドン２の任意の位置に固定できるため、テンドン２の削孔開口部に配置される部位を剛性な耐荷体であるマンションとする必要はなく、位置合わせ作業を容易に行える柔軟性を持たせることができ、筒部材１はテンドン２を孔内へ挿入後に装着できるため、緊張定着作業において筒部材１の外周に形成されたネジ溝が破損するおそれがない。従って、適切な位置合わせを容易に行うことができ、テンドン２の頭部に設けられる荷重調整代に損傷を与えるおそれもない。 Further, according to this embodiment, since the head members (the wedge receiving member 4 and the fixing wedge 5) used for fixing the tendon 2 can be fixed at an arbitrary position of the tendon 2, the head member is disposed at the hole opening of the tendon 2. It is not necessary to make the site to be a rigid load-bearing apartment, but it can be flexible enough to facilitate alignment work, and the cylinder member 1 can be installed after inserting the tendon 2 into the hole, so tension There is no possibility that the screw groove formed on the outer periphery of the cylindrical member 1 is damaged in the fixing operation. Therefore, proper alignment can be easily performed, and there is no risk of damaging the load adjustment margin provided on the head of the tendon 2.

更にまた、この実施形態によれば、筒部材１の長さ寸法を大きくとることにより引張力の荷重調整代を大きくすることができ、ナット部材３よりも径の小さい筒部材１のみが受圧構造物から突出することになるため、引張力の荷重調整代を大きくしても受圧構造物からの突出部分を小さく抑えることができる。従って、施工に必要とされる十分な荷重調整代を設けることができる。 Furthermore, according to this embodiment, the load adjustment margin of the tensile force can be increased by increasing the length dimension of the cylindrical member 1, and only the cylindrical member 1 having a diameter smaller than that of the nut member 3 receives pressure. Since it protrudes from a thing, even if it makes load adjustment allowance of tensile force large, the projection part from a pressure receiving structure can be restrained small. Therefore, it is possible to provide a sufficient load adjustment margin required for construction.

なお、この実施形態では、筒部材１が支圧板６を貫通しており、楔受部材４が当接していない端部、すなわち、下側の部位１４が支圧板６の受圧構造物との接触面（以下、接地面６２とする）より地中側に配置することにより筒部材１の長さ寸法を大きくし、荷重調整代を大きくしている。ただし、筒部材１の下側の部位１４の位置は、必要とされる荷重調整代に応じて決めることができ、支圧板６の上側に配置してもよい。 In this embodiment, the cylindrical member 1 penetrates the pressure bearing plate 6, and the end where the wedge receiving member 4 is not in contact, that is, the lower portion 14 is in contact with the pressure receiving structure of the pressure bearing plate 6. By arranging the cylindrical member 1 on the ground side of the surface (hereinafter referred to as the ground contact surface 62), the length dimension of the cylindrical member 1 is increased, and the load adjustment margin is increased. However, the position of the lower portion 14 of the cylindrical member 1 can be determined in accordance with the required load adjustment margin, and may be disposed above the bearing plate 6.

筒部材１の下側の部位１４を支圧板６の接地面６２より地中側に配置する場合、防錆処理を施すことが好ましい。防錆処理には、公知の手法を採用することができるが、溶融アルミメッキを施すことが好ましい。なお、筒部材１の材質として、ステンレスなどの耐食性に優れたものを採用した場合は防錆処理を省いてもよい。 In the case where the lower portion 14 of the cylindrical member 1 is disposed on the ground side of the ground contact surface 62 of the bearing plate 6, it is preferable to apply an anticorrosion treatment. Although a publicly known method can be adopted for rustproofing, it is preferable to apply hot-dip aluminum plating. In addition, when the thing excellent in corrosion resistance, such as stainless steel, is employ | adopted as a material of the cylinder member 1, you may omit an antirust process.

筒部材１の下側の部位１４が支圧板６よりも上側に配置される場合、テンドン２に作用する引張力に対抗し、ナット部材３の筒部材１に対する位置を維持するために必要な段数のねじ山を螺合させる。この実施形態では、テンドン２として、１×φ１２．７ｍｍ、１×φ１５．２ｍｍ、１×φ１７．８ｍｍ、１×φ２１．８ｍｍの４種類が想定されているが、この場合、テンドン２に適切な引張力が作用した状態で必要なねじ山が螺合していれば、ナット部材３の筒部材１に対する位置を維持することができる。 When the lower portion 14 of the cylindrical member 1 is disposed above the bearing plate 6, the number of steps required to maintain the position of the nut member 3 relative to the cylindrical member 1 against the tensile force acting on the tendon 2 Screw the threads of. In this embodiment, four types of tendon 2 of 1 × φ12.7 mm, 1 × φ15.2 mm, 1 × φ17.8 mm, and 1 × φ21.8 mm are assumed, but in this case, it is appropriate for tendon 2 If the necessary screw threads are screwed together in a state where the tensile force is applied, the position of the nut member 3 with respect to the cylindrical member 1 can be maintained.

この実施形態では、テンドン２のシース２１で被覆された部位が筒部材１の内部に密着した状態となっている。そのため、水分の筒部材１の内部への侵入が抑制され、定着楔５の配置を目的としてＰＣ鋼より線２２が露出している部位の腐食が防止されるものとなっている。なお、テンドン２として、付着型ＥＣＦストランド（内部充てん型エポキシ塗料鋼線）を使用すると、テンドン２そのものに１００年の設計対応年数がある為、防食の必要がない。 In this embodiment, the portion of the tendon 2 covered by the sheath 21 is in a state of being in close contact with the inside of the cylindrical member 1. Therefore, the penetration of moisture into the inside of the cylindrical member 1 is suppressed, and the corrosion of the portion where the wire 22 is exposed from the PC steel is prevented for the purpose of arranging the fixing rod 5. In addition, when an adhesion type ECF strand (internally filled type epoxy coating steel wire) is used as the tendon 2, there is no need for anticorrosion since the tendon 2 itself has a design correspondence period of 100 years.

露出したＰＣ鋼より線２２の防食効果をより高いものとする必要がある場合、筒部材１の下側開口に止水手段を設けても良い。止水手段を設けた実施形態を図２に示す。なお、図２において、図１に示す実施形態と実質的に同じ部分には同符号を付し、その説明を省略又は簡略化する。 If it is necessary to further enhance the anticorrosion effect of the exposed PC steel wire 22, water blocking means may be provided at the lower opening of the cylindrical member 1. An embodiment provided with a water blocking means is shown in FIG. In FIG. 2, the same reference numerals are given to substantially the same parts as the embodiment shown in FIG. 1, and the description thereof will be omitted or simplified.

図２に示す実施形態では、止水手段として、シールリング７が採用されている。シールリング７は、筒部材１の下側開口の内周に形成された環状溝１５に装着されている。そして、テンドン２のシース２１の外周に密着し、筒部材１の内部への水分の侵入を防止するものとなっている。 In the embodiment shown in FIG. 2, the seal ring 7 is adopted as a water blocking means. The seal ring 7 is mounted in an annular groove 15 formed on the inner periphery of the lower opening of the cylindrical member 1. Then, it is in close contact with the outer periphery of the sheath 21 of the tendon 2 and prevents entry of moisture into the inside of the cylindrical member 1.

図１及び図２に示す実施形態は、テンドン２を１本毎に定着させるものとなっているが、１つの構造でテンドン２の複数本を定着させることとしてもよい。複数本のテンドンを定着させる実施形態を図３に示す。なお、図３において、図１及び図２に示す実施形態と実質的に同じ部分には同符号を付し、その説明を省略又は簡略化する。 Although the embodiment shown in FIG. 1 and FIG. 2 fixes the tendons 2 one by one, it is also possible to fix a plurality of the tendons 2 with one structure. An embodiment for fixing a plurality of tendons is shown in FIG. In FIG. 3, the same reference numerals are given to substantially the same parts as those in the embodiment shown in FIGS. 1 and 2, and the description thereof will be omitted or simplified.

図３に示す実施形態では、筒部材１の貫通孔１１が、テンドン２を２本並べて挿入できる寸法となっている。また、楔受部材４には貫通孔４１が２個設けられ、各々の貫通孔４１に楔受口４２が設けられている。そして、筒部材１の貫通孔１１に挿通された２本のテンドン２が、楔受部材４と２個の定着楔５で構成されるヘッド部材に個々に固定されるものとなっている。 In the embodiment shown in FIG. 3, the through holes 11 of the cylindrical member 1 are sized so that two tendons 2 can be aligned and inserted. Further, two through holes 41 are provided in the wedge receiving member 4, and a wedge receiving port 42 is provided in each of the through holes 41. Then, the two tendons 2 inserted into the through holes 11 of the cylindrical member 1 are individually fixed to the head member constituted by the wedge receiving member 4 and the two fixing rods 5.

また、筒部材１の下側開口には、円柱形の止水蓋８が嵌装されている。止水蓋８は、可撓性を持つ素材で形成され、テンドン２を挿通する２つの貫通孔８１を有し、これら貫通孔８１には、テンドン２のシース２１で被覆された部位が挿入されるものとなっている。更に、止水蓋８の外周には複数の環状突起８２が設けられ、筒部材１下側開口の内周に設けられた複数の環状溝１５に嵌合し、高い水密性を維持することが可能となっている。 Further, a cylindrical water blocking lid 8 is fitted in the lower opening of the cylindrical member 1. The water blocking lid 8 is formed of a flexible material and has two through holes 81 through which the tendon 2 is inserted, and in these through holes 81, a portion covered with the sheath 21 of the tendon 2 is inserted It has become. Furthermore, a plurality of annular projections 82 are provided on the outer periphery of the water blocking lid 8, and fitted in the plurality of annular grooves 15 provided on the inner periphery of the lower opening of the cylindrical member 1 to maintain high water tightness. It is possible.

図１〜３に示す実施形態において、楔受部材４と筒部材１は別体とされているが、これらを一体にしてもよい。楔受部材と筒部材を一体にした実施形態を図４に示す。なお、図４において、図１〜３に示す実施形態と実質的に同じ部分には同符号を付し、その説明を省略又は簡略化する。 In the embodiment shown in FIGS. 1 to 3, although the sheath receiving member 4 and the cylindrical member 1 are separated, they may be integrated. An embodiment in which the wedge receiving member and the cylindrical member are integrated is shown in FIG. In addition, in FIG. 4, the same code | symbol is attached | subjected to the substantially same part as embodiment shown to FIGS. 1-3, and the description is abbreviate | omitted or simplified.

図４に示す実施形態では、筒部材１０の一方の端面が、貫通孔１１の径よりも大きく開口し筒部材１０の他方の端面側に向かって縮径し、円錐台形の定着楔５を受け入れることが可能な形状の楔受口４２となっている。 In the embodiment shown in FIG. 4, one end face of the cylindrical member 10 is opened larger than the diameter of the through hole 11 and diameter-reduced toward the other end face side of the cylindrical member 10 to receive the truncated cone 5. It has become a bowl receptacle 42 of the shape which can be done.

楔受口４２を有する筒部材１０もまた、図１〜３に示す実施形態の筒部材１と同様に、シールリング、止水蓋などの止水手段が設けられてもよい。更に、複数本のテンドンを定着させるために、貫通孔１１と楔受口４２が複数設けられてもよい。 As in the case of the cylindrical member 1 of the embodiment shown in FIGS. 1 to 3, the cylindrical member 10 having the weir receiving port 42 may also be provided with water blocking means such as a seal ring, a water blocking lid or the like. Furthermore, in order to fix a plurality of tendons, a plurality of through holes 11 and a weir receiving opening 42 may be provided.

１、１０筒部材
２テンドン
３ナット部材
４楔受部材
５定着楔
６支圧板
７シールリング
８止水蓋
１１、４１、６１、８１貫通孔
１２ネジ溝
１３凹陥部
１４下側の部位
１５環状溝
２１シース
２２ＰＣ鋼より線
４２楔受口
５１楔構成部材
６２接地面
８２環状突起 1, 10 cylindrical member 2 tendon 3 nut member 4 receiving member 5 fixing rod 6 supporting pressure plate 7 seal ring 8 water blocking lid 11, 41, 61, 81 through hole 12 thread groove 13 recessed portion 14 lower portion 15 annular groove Reference Signs List 21 sheath 22 PC steel strand wire 42 wedge receiving port 51 wedge component 62 ground plane 82 annular projection

Claims

A tendon is inserted, and a cylindrical member having an outer diameter smaller than the inner diameter of the through hole of the bearing plate is provided, the relative movement of the tendon and the cylindrical member is enabled, and a screw groove is formed on the outer periphery of the cylindrical member. head member fixed to an arbitrary position one end of the PC strand of said tendon member abuts the nut member screwed to the screw groove is fitted on the outer periphery of the tubular member abuts on the bearing capacity plate Tendon's head fixing structure characterized by that.

The head fixing structure of a tendon according to claim 1, wherein the cylindrical member penetrates the bearing plate.

A tendon is inserted, and a cylindrical member having an outer diameter smaller than the inner diameter of the through hole of the bearing plate is provided, the relative movement of the tendon and the cylindrical member is enabled, and a screw groove is formed on the outer periphery of the cylindrical member. one end of the member is fixed at an arbitrary position of the PC strand of the tendon, the nut member screwed to the screw groove is fitted on the outer periphery of the tubular member is brought into contact with the bearing capacity plate, the cylindrical member is, A tendon head fixing structure characterized in that the bearing plate is penetrated.