JP6985595B2

JP6985595B2 - Pile construction device with check valve and pile construction method

Info

Publication number: JP6985595B2
Application number: JP2017210549A
Authority: JP
Inventors: 伊佐夫山本; 英治諸越
Original assignee: Japan Pile Corp
Current assignee: Asia Pile Holdings Corp
Priority date: 2017-10-31
Filing date: 2017-10-31
Publication date: 2021-12-22
Anticipated expiration: 2037-10-31
Also published as: JP2019082059A

Description

本開示は、杭構築装置用の逆止弁付きノズル、逆止弁付き杭構築装置、及び、杭構築方法に関する。 The present disclosure relates to a nozzle with a check valve for a pile construction device, a pile construction device with a check valve, and a pile construction method.

杭を構築するために杭孔内に配置される杭構築装置として、例えば、ビット付きケーシング、掘削ドリル及びトレミー管等をあげることができる。これら杭構築装置のうち、トレミー管は勿論、ビット付きケーシングや掘削ドリルにおいても、杭孔内に流体を供給可能な流路を有しているものがある。
例えば、特許文献１が開示する土木工事用削孔ケーシングは、高圧流体を噴出させるためのパイプ及びノズルを有しており、高圧流体によって掘削力低下を防止している。 Examples of the pile construction device arranged in the pile hole for constructing a pile include a casing with a bit, an excavation drill, a tremie pipe, and the like. Among these pile construction devices, not only tremie pipes but also casings with bits and excavation drills have a flow path capable of supplying fluid in the pile holes.
For example, the drilling casing for civil engineering work disclosed in Patent Document 1 has a pipe and a nozzle for ejecting a high-pressure fluid, and the high-pressure fluid prevents a decrease in excavation force.

特開２００１−１８２４７０号公報Japanese Unexamined Patent Publication No. 2001-182470

特許文献１が開示する土木工事用削孔ケーシングでは、ノズルに取り付けられた逆止弁の弁体であるボールと座面との間に土砂や骨材等が詰まると除去が困難なため、ネジ口金Ｓを取り外す必要がある。ネジ口金Ｓの取外しには、掘削作業全体を長時間停止させなければならないので、作業効率が低下する。
また、コンクリートを噴出する噴出孔Ｏ_４はストレート形状であるため、直進方向、即ち深度方向に集中的にコンクリートが供給されて径方向、即ち外周方向には供給されにくい。このため、コンクリートを供給後に、長時間にわたって撹拌作業を行わなければならない。
さらに、弁体がボールなので、骨材等によってノズル内の径方向に押し付けられてバネから外れてしまう。係る状態でボールとノズル内周面との間に詰まるとシール性能が低下する。 In the drilling casing for civil engineering work disclosed in Patent Document 1, if earth and sand, aggregate, etc. are clogged between the ball, which is the valve body of the check valve attached to the nozzle, and the seat surface, it is difficult to remove the screw. It is necessary to remove the base S. In order to remove the screw cap S, the entire excavation work must be stopped for a long time, so that the work efficiency is lowered.
Further, since the ejection hole O ₄ for ejecting the concrete is straight shape, straight ahead, i.e. the depth direction intensively concrete is supplied radially, i.e. the outer circumferential direction to hardly supplied. Therefore, after supplying the concrete, the stirring work must be performed for a long time.
Further, since the valve body is a ball, it is pressed in the radial direction in the nozzle by an aggregate or the like and comes off from the spring. If the ball is clogged between the ball and the inner peripheral surface of the nozzle in such a state, the sealing performance will deteriorate.

上述の事情に鑑みて、本発明の少なくとも一実施形態の目的は、シール性に優れた杭構築装置用の逆止弁付きノズル、それを用いた逆止弁付き杭構築装置、及び、杭構築方法を提供することにある。 In view of the above circumstances, an object of at least one embodiment of the present invention is a nozzle with a check valve for a pile construction device having excellent sealing properties, a pile construction device with a check valve using the nozzle, and a pile construction. To provide a method.

（１）本発明の少なくとも一実施形態に係る逆止弁付き杭構築装置は、
杭孔内に流体を供給するための流路を有する杭構築装置と、
前記杭構築装置に対し前記流路を開閉可能に取り付けられた逆止弁付きノズルと、を備える逆止弁付き杭構築装置において、
前記逆止弁付きノズルは、
前記流体の供給方向にて下流側に向けられた環状の弁座と、
前記弁座に対し接離可能なシール縁を有する弁体と、
前記弁体に接続された一端部を有し、前記弁体から前記流体の供給方向にて上流側に向けて延在する弁棒と、
前記流体の供給方向にて前記弁座よりも上流側に設けられ、前記弁棒を前記弁棒の軸線方向に摺動自在に支持する支持部と、
前記弁棒の他端側に取り付けられたばね座部と、
前記支持部と前記ばね座部との間に配置され、前記弁体を前記弁座に向けて付勢するコイルばねと、を備え、
閉弁時に前記弁体は前記弁座に対して線接触し、
前記杭構築装置はビット付きケーシングであり、
前記ビット付きケーシングは、
円筒形状のケーシングと、
前記ケーシングの一端に取り付けられたビットと、
前記ケーシングの外周面上に配置され、前記流路を構成するパイプと、
を備える。 ( 1 ) The pile construction device with a check valve according to at least one embodiment of the present invention is
A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided on the upstream side of the valve seat in the fluid supply direction and slidably supporting the valve rod in the axial direction of the valve rod, and a support portion.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is a casing with a bit.
The casing with a bit
Cylindrical casing and
A bit attached to one end of the casing and
A pipe arranged on the outer peripheral surface of the casing and constituting the flow path,
To prepare for.

上記構成（１）によれば、弁体は弁座に線接触するので、土砂や骨材等を挟み込む可能性が少ない。また、土砂や骨材等を挟み込んだ場合にも、コイルばねの力が弁体の外周部分、即ち線接触部分に集中するため、土砂や骨材等を砕いて除去することができる。このため、良好なシール性を維持することができる。
また、万が一、土砂や骨材等を挟み込んでも、弁座が下流側に向けられており、弁座と弁体が露出しているため、土砂や骨材等を短時間で容易に除去することができる。
さらに、弁棒が支持部によって摺動自在に支持されていることにより弁棒は直進性に優れており、ノズルの径方向に傾く事を抑制できる。このため、弁座からの弁体のリフト量が弁体の周方向にて均一になり、開弁時に弁体と弁座の隙間からコンクリート等を外周方向に均等に供給することができる。したがって、杭孔内に供給されたコンクリート等を撹拌する場合、撹拌の作業時間を従来よりも大幅に短縮することができる。 According to the above configuration ( 1 ), since the valve body is in line contact with the valve seat, there is little possibility of sandwiching earth and sand, aggregate, or the like. Further, even when the earth and sand and the aggregate are sandwiched, the force of the coil spring is concentrated on the outer peripheral portion of the valve body, that is, the line contact portion, so that the earth and sand and the aggregate can be crushed and removed. Therefore, good sealing properties can be maintained.
In addition, even if earth and sand, aggregate, etc. are sandwiched, the valve seat is directed to the downstream side and the valve seat and valve body are exposed, so that earth and sand, aggregate, etc. can be easily removed in a short time. Can be done.
Further, since the valve rod is slidably supported by the support portion, the valve rod has excellent straightness and can suppress tilting in the radial direction of the nozzle. Therefore, the amount of lift of the valve body from the valve seat becomes uniform in the circumferential direction of the valve body, and concrete or the like can be evenly supplied in the outer peripheral direction from the gap between the valve body and the valve seat when the valve is opened. Therefore, when the concrete or the like supplied into the pile hole is agitated, the agitation work time can be significantly shortened as compared with the conventional case.

そして上記構成（１）によれば、掘削した土砂がビット付きケーシングの流路内へ浸入するのを防止することができるとともに、掘削液、安定液又はセメントミルク等の流体を、逆流を防止しながら流路を通じて杭孔内に供給することができる。 And according to the above configuration (1), together with the excavated earth and sand can be prevented from infiltrating into the bit with the casing of the flow path, drilling fluid, a fluid such as a stabilizing solution or cement milk to prevent backflow However, it can be supplied into the pile hole through the flow path.

（２）幾つかの実施形態では、上記構成（１）において、
前記杭構築装置は掘削ドリルであり、
前記掘削ドリルは前記流路が形成された胴部と、
前記胴部と一体に設けられた翼部と、
前記翼部と一体に設けられたビットと、
を備える。
上記構成（２）によれば、掘削した土砂が掘削ドリルの流路内へ浸入するのを防止することができるとともに、掘削液、安定液又はセメントミルク等の流体を、逆流を防止しながら流路を通じて杭孔内に供給することができる。 ( 2 ) In some embodiments, in the above configuration ( 1 ),
The pile construction device is an excavation drill.
The excavation drill has a body on which the flow path is formed and a body.
A wing portion provided integrally with the body portion and
A bit provided integrally with the wing and
To prepare for.
According to the above configuration ( 2 ), it is possible to prevent the excavated earth and sand from infiltrating into the flow path of the excavation drill, and at the same time, the excavation liquid, the stabilizing liquid or the fluid such as cement milk flows while preventing the backflow. It can be supplied into the pile hole through the road.

（３）幾つかの実施形態では、上記構成（１）において、
前記杭構築装置は、前記流路を構成するトレミー管である。
上記構成（３）によれば、杭孔に貯まった水がトレミー管の流路内へ浸入するのを防止することができるとともに、逆流を防止しながら流路を通じてコンクリートを杭孔内に供給することができる。 ( 3 ) In some embodiments, in the above configuration ( 1 ),
The pile construction device is a tremie pipe constituting the flow path.
According to the above configuration ( 3 ), water accumulated in the pile hole can be prevented from entering the flow path of the tremie pipe, and concrete is supplied into the pile hole through the flow path while preventing backflow. be able to.

（４）本発明の少なくとも一実施形態に係る杭構築方法は、
杭孔内に流体を供給するための流路を有する杭構築装置と、
前記杭構築装置に対し前記流路を開閉可能に取り付けられた逆止弁付きノズルと、を備える逆止弁付き杭構築装置を用いた杭構築方法において、
前記流路及び前記逆止弁付きノズルを通じて、前記杭孔内に流体を供給する流体供給工程を備え、
前記逆止弁付きノズルは、
前記流体の供給方向にて下流側に向けられた環状の弁座と、
前記弁座に対し接離可能なシール縁を有する弁体と、
前記弁体に接続された一端部を有し、前記弁体から前記流体の供給方向にて上流側に向けて延在する弁棒と、
前記流体の供給方向にて前記弁座よりも上流側に設けられ、前記弁棒を前記弁棒の軸線方向に摺動自在に支持する支持部と、
前記弁棒の他端側に取り付けられたばね座部と、
前記支持部と前記ばね座部との間に配置され、前記弁体を前記弁座に向けて付勢するコイルばねと、を備え、
前記逆止弁付きノズルの閉弁時に前記弁体は前記弁座に対して線接触し、
前記杭構築装置はビット付きケーシングであり、
前記流体供給工程において、前記流体として掘削液、安定液又はセメントミルクを供給する。 ( 4 ) The pile construction method according to at least one embodiment of the present invention is
A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction method using a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
A fluid supply step of supplying fluid into the pile hole through the flow path and the check valve nozzle is provided.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided on the upstream side of the valve seat in the fluid supply direction and slidably supporting the valve rod in the axial direction of the valve rod, and a support portion.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the nozzle with a check valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is a casing with a bit.
In the fluid supply step, excavation liquid, stabilizing liquid or cement milk is supplied as the fluid.

上記構成（４）によれば、弁体は弁座に線接触するので、土砂や骨材等を挟み込む可能性が少ない。また、土砂や骨材等を挟み込んだ場合にも、コイルばねの力が弁体の外周部分、即ち線接触部分に集中するため、土砂や骨材等を砕いて除去することができる。このため、良好なシール性を維持することができる。
また、万が一、土砂や骨材等を挟み込んでも、弁座が下流側に向けられており、弁座と弁体が露出しているため、土砂や骨材等を短時間で容易に除去することができる。
さらに、弁棒が支持部によって摺動自在に支持されていることにより弁棒は直進性に優れており、ノズルの径方向に傾く事を抑制できる。このため、弁座からの弁体のリフト量が弁体の周方向にて均一になり、開弁時に弁体と弁座の隙間からコンクリート等を外周方向に均等に供給することができる。したがって、杭孔内に供給されたコンクリートを撹拌する場合、撹拌の作業時間を従来よりも大幅に短縮することができる。 According to the above configuration ( 4 ), since the valve body is in line contact with the valve seat, there is little possibility of sandwiching earth and sand, aggregate, or the like. Further, even when the earth and sand and the aggregate are sandwiched, the force of the coil spring is concentrated on the outer peripheral portion of the valve body, that is, the line contact portion, so that the earth and sand and the aggregate can be crushed and removed. Therefore, good sealing properties can be maintained.
In addition, even if earth and sand, aggregate, etc. are sandwiched, the valve seat is directed to the downstream side and the valve seat and valve body are exposed, so that earth and sand, aggregate, etc. can be easily removed in a short time. Can be done.
Further, since the valve rod is slidably supported by the support portion, the valve rod has excellent straightness and can suppress tilting in the radial direction of the nozzle. Therefore, the amount of lift of the valve body from the valve seat becomes uniform in the circumferential direction of the valve body, and concrete or the like can be evenly supplied in the outer peripheral direction from the gap between the valve body and the valve seat when the valve is opened. Therefore, when the concrete supplied into the pile hole is agitated, the agitation work time can be significantly shortened as compared with the conventional case.

そして上記構成（４）によれば、掘削した土砂がビット付きケーシングの流路内へ浸入するのを防止することができるとともに、掘削液、安定液又はセメントミルク等の流体を、逆流を防止しながら流路を通じて杭孔内に供給することができる。 And according to the above configuration (4), together with the excavated earth and sand can be prevented from infiltrating into the bit with the casing of the flow path, drilling fluid, a fluid such as a stabilizing solution or cement milk to prevent backflow However, it can be supplied into the pile hole through the flow path.

（５）幾つかの実施形態では、上記構成（４）において、
前記杭構築装置は掘削ドリルであり、
前記流体供給工程において、前記流体として掘削液、安定液又はセメントミルクを供給する。
上記構成（５）によれば、掘削した土砂が掘削ドリルの流路内へ浸入するのを防止することができるとともに、掘削液、安定液又はセメントミルク等の流体を、逆流を防止しながら流路を通じて杭孔内に供給することができる。 ( 5) In some embodiments, in the above configuration ( 4 ),
The pile construction device is an excavation drill.
In the fluid supply step, excavation liquid, stabilizing liquid or cement milk is supplied as the fluid.
According to the above configuration ( 5 ), it is possible to prevent the excavated earth and sand from infiltrating into the flow path of the excavation drill, and at the same time, the excavation liquid, the stabilizing liquid or the fluid such as cement milk flows while preventing the backflow. It can be supplied into the pile hole through the road.

（６）幾つかの実施形態では、上記構成（４）において、
前記杭構築装置はトレミー管であり、
前記流体供給工程において、前記流体としてコンクリートを供給する、
上記構成（６）によれば、杭孔に貯まった水がトレミー管の流路内へ浸入するのを防止することができるとともに、逆流を防止しながら流路を通じてコンクリートを杭孔内に供給することができる。 ( 6) In some embodiments, in the above configuration ( 4 ),
The pile construction device is a tremie pipe,
In the fluid supply step, concrete is supplied as the fluid.
According to the above configuration ( 6 ), water accumulated in the pile hole can be prevented from entering the flow path of the tremie pipe, and concrete is supplied into the pile hole through the flow path while preventing backflow. be able to.

本発明の少なくとも一実施形態によれば、シール性に優れた杭構築装置用の逆止弁付きノズル、それを用いた逆止弁付き杭構築装置、及び、杭構築方法が提供される。 According to at least one embodiment of the present invention, there is provided a nozzle with a check valve for a pile construction device having excellent sealing properties, a pile construction device with a check valve using the nozzle, and a pile construction method.

本発明の一実施形態に係る逆止弁付き杭構築装置として、逆止弁付きノズルが適用されたビット付きケーシングを概略的に示す側面図である。It is a side view schematically showing the casing with a bit to which the nozzle with a check valve is applied as the pile construction apparatus with a check valve which concerns on one Embodiment of this invention. 図１中の逆止弁付きノズルの概略的な側面図である。It is a schematic side view of the nozzle with a check valve in FIG. 1. 図１中の逆止弁付きノズルの閉弁時の概略的な縦断面図である。It is a schematic vertical sectional view at the time of closing a nozzle with a check valve in FIG. 1. 図１中の逆止弁付きノズルの開弁時の概略的な縦断面図である。It is a schematic vertical sectional view at the time of opening of a nozzle with a check valve in FIG. 1. 図１中の逆止弁付きノズルの概略的な上面図である。It is a schematic top view of the nozzle with a check valve in FIG. 1. 図１中の逆止弁付きノズルの概略的な下面図である。It is a schematic bottom view of the nozzle with a check valve in FIG. 1. 本発明の他の一実施形態に係る逆止弁付き杭構築装置として、逆止弁付きノズルが適用された掘削ドリルを概略的に示す側面図である。It is a side view schematically showing the excavation drill to which the nozzle with a check valve is applied as the pile construction apparatus with a check valve which concerns on another embodiment of this invention. 図７中の逆止弁付きノズルの閉弁時の概略的な縦断面図である。FIG. 7 is a schematic vertical sectional view of a nozzle with a check valve in FIG. 7 when the valve is closed. 図７中の逆止弁付きノズルの開弁時の概略的な縦断面図である。It is a schematic vertical sectional view at the time of opening of a nozzle with a check valve in FIG. 7. 図７中の逆止弁付きノズルの概略的な上面図である。It is a schematic top view of the nozzle with a check valve in FIG. 7. 図７中の逆止弁付きノズルの概略的な下面図である。It is a schematic bottom view of the nozzle with a check valve in FIG. 7. 本発明の他の一実施形態に係る逆止弁付き杭構築装置として、逆止弁付きノズルが適用されたトレミー管を概略的に示す側面図である。It is a side view schematically showing the tremie pipe to which the nozzle with a check valve is applied as the pile construction apparatus with a check valve which concerns on another embodiment of this invention. 図１２中の逆止弁付きノズルの閉弁時の概略的な縦断面図である。12 is a schematic vertical sectional view of a nozzle with a check valve in FIG. 12 when the valve is closed. 本発明の他の一実施形態に係る逆止弁付きノズルの閉弁時の概略的な縦断面図である。It is a schematic vertical sectional view at the time of valve closing of the nozzle with a check valve which concerns on another embodiment of this invention. 本発明の他の一実施形態に係る逆止弁付きノズルの閉弁時の概略的な縦断面図である。It is a schematic vertical sectional view at the time of valve closing of the nozzle with a check valve which concerns on another embodiment of this invention.

以下、添付図面を参照して本発明の幾つかの実施形態について説明する。ただし、実施形態として記載されている又は図面に示されている構成部品の寸法、材質、形状、その相対的配置等は、本発明の範囲をこれに限定する趣旨ではなく、単なる説明例にすぎない。
例えば、「ある方向に」、「ある方向に沿って」、「平行」、「直交」、「中心」、「同心」或いは「同軸」等の相対的或いは絶対的な配置を表す表現は、厳密にそのような配置を表すのみならず、公差、若しくは、同じ機能が得られる程度の角度や距離をもって相対的に変位している状態も表すものとする。
例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。
例えば、四角形状や円筒形状等の形状を表す表現は、幾何学的に厳密な意味での四角形状や円筒形状等の形状を表すのみならず、同じ効果が得られる範囲で、凹凸部や面取り部等を含む形状も表すものとする。
一方、一の構成要素を「備える」、「具える」、「具備する」、「含む」、又は、「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。 Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention to this, but are merely explanatory examples. No.
For example, expressions that represent relative or absolute arrangements such as "in one direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a tolerance or a state of relative displacement at an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, the expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or a chamfer within the range where the same effect can be obtained. It shall also represent the shape including the part and the like.
On the other hand, the expressions "equipped", "equipped", "equipped", "included", or "have" one component are not exclusive expressions excluding the existence of other components.

図１は、本発明の一実施形態に係る逆止弁付き杭構築装置としての、逆止弁付きノズル１０が適用されたビット付きケーシング１を概略的に示す側面図である。
ビット付きケーシング１は、円筒形状の本体部３と、本体部３の下端に取り付けられた複数のビット５と、本体部３の外周面に固定されたパイプ７と、パイプ７の下端に取り付けられた逆止弁付きノズル１０とを備えている。
パイプ７は、本体部３の軸線方向に延び、流体の流路を構成している。逆止弁付きノズル１０は、パイプ７を通じて供給された流体を杭孔内に吐出可能である。流体としては、例えば、掘削液としての水をあげることができるが、ベンドナイトを含む安定液であってもよい。また、流体はセメントミルク等であってもよい。 FIG. 1 is a side view schematically showing a casing 1 with a bit to which a nozzle 10 with a check valve is applied as a pile construction device with a check valve according to an embodiment of the present invention.
The casing 1 with bits is attached to a cylindrical main body portion 3, a plurality of bits 5 attached to the lower end of the main body portion 3, a pipe 7 fixed to the outer peripheral surface of the main body portion 3, and the lower end of the pipe 7. It is provided with a nozzle 10 with a check valve.
The pipe 7 extends in the axial direction of the main body 3 and constitutes a fluid flow path. The nozzle 10 with a check valve can discharge the fluid supplied through the pipe 7 into the pile hole. As the fluid, for example, water as an excavation liquid can be mentioned, but a stable liquid containing bendnite may be used. Further, the fluid may be cement milk or the like.

図２は、逆止弁付きノズル１０の概略的な側面図である。図３は、逆止弁付きノズル１０の閉弁時の概略的な縦断面図である。図４は、逆止弁付きノズル１０の開弁時の概略的な縦断面図である。図５は、逆止弁付きノズル１０の概略的な上面図である。図６は、逆止弁付きノズル１０の概略的な下面図である。 FIG. 2 is a schematic side view of the nozzle 10 with a check valve. FIG. 3 is a schematic vertical sectional view of the nozzle 10 with a check valve when the valve is closed. FIG. 4 is a schematic vertical sectional view of the nozzle 10 with a check valve when the valve is opened. FIG. 5 is a schematic top view of the nozzle 10 with a check valve. FIG. 6 is a schematic bottom view of the nozzle 10 with a check valve.

図２〜図６に示したように、逆止弁付きノズル１０は、弁ケーシング１２と、弁座１４と、弁体１６と、弁棒１８と、支持部２０と、ばね座部２２と、コイルばね２４とを備えている。
弁ケーシング１２は中空の筒形状を有し、弁ケーシング１２の先端部１２ａは六角柱形状の外形を有している。弁ケーシング１２の基端部１２ｂは、円筒形状の外形を有しており、外周面にねじ山が形成されている。基端部１２ｂのねじ山は、パイプ７の下端に設けられたねじ山と螺合可能であり、ねじ山を介して、逆止弁付きノズル１０はパイプ７に取り付け可能である。なお、弁ケーシング１２の先端部１２ａが六角柱形状の外形を有しているので、スパナ等の工具を用いて、逆止弁付きノズル１０の取り付け又は取り外しを容易に行うことができる。 As shown in FIGS. 2 to 6, the nozzle 10 with a check valve includes a valve casing 12, a valve seat 14, a valve body 16, a valve rod 18, a support portion 20, and a spring seat portion 22. It is provided with a coil spring 24.
The valve casing 12 has a hollow tubular shape, and the tip portion 12a of the valve casing 12 has a hexagonal columnar outer shape. The base end portion 12b of the valve casing 12 has a cylindrical outer shape, and a thread is formed on the outer peripheral surface. The thread of the base end portion 12b can be screwed with a thread provided at the lower end of the pipe 7, and the nozzle 10 with a check valve can be attached to the pipe 7 via the thread. Since the tip portion 12a of the valve casing 12 has a hexagonal columnar outer shape, the nozzle 10 with a check valve can be easily attached or detached by using a tool such as a spanner.

弁ケーシング１２の先端部１２ａには、弁ケーシング１２の軸線方向に延在する弁孔２６が形成されている。そして、弁孔２６の出口側を囲むように、先端部１２ａに弁座１４が形成されている。弁座１４は、環状をなし、流体の供給方向にて下流側、つまり弁ケーシング１２の外側に向けられている。 A valve hole 26 extending in the axial direction of the valve casing 12 is formed at the tip end portion 12a of the valve casing 12. A valve seat 14 is formed at the tip portion 12a so as to surround the outlet side of the valve hole 26. The valve seat 14 has an annular shape and is directed to the downstream side in the fluid supply direction, that is, to the outside of the valve casing 12.

弁体１６は、弁ケーシング１２の軸線方向にて弁座１４に対し接離可能なシール縁２８を有している。例えば、弁体１６は中央部が肉厚に形成された円盤形状を有し、シール縁２８を構成する円形の外周縁を有している。
弁棒１８は、弁ケーシング１２の軸線方向に延在しており、弁棒１８の一端は弁体１６の径方向中心に接続されている。弁棒１８は、弁体１６から流体の供給方向にて上流側に向かって延在している。例えば、弁棒１８の一端部は弁体１６に螺合された後に溶接により固定されている。 The valve body 16 has a seal edge 28 that can be brought into contact with and detached from the valve seat 14 in the axial direction of the valve casing 12. For example, the valve body 16 has a disk shape having a thickly formed central portion, and has a circular outer peripheral edge constituting the seal edge 28.
The valve rod 18 extends in the axial direction of the valve casing 12, and one end of the valve rod 18 is connected to the radial center of the valve body 16. The valve rod 18 extends from the valve body 16 toward the upstream side in the fluid supply direction. For example, one end of the valve stem 18 is screwed to the valve body 16 and then fixed by welding.

支持部２０は、流体の供給方向にて弁座１４よりも上流側に設けられ、弁棒１８を弁棒１８の軸線方向に摺動自在に支持している。本実施形態では、支持部１８は、支持フレーム２０ａと支持スリーブ２０ｂによって構成されている。
支持フレーム２０ａは、弁ケーシング１２に対して固定されている。支持フレーム２０ａは、弁ケーシング１２の軸線方向と直交する方向に延在する横断部３０を有している。弁ケーシング１２の軸線方向でみたときの横断部３０の面積は、可及的に小さくなるように設定され、流体の流れをなるべく妨げないようになっている。例えば、支持フレーム２０ａはコの字形状の断面形状を有し、弁孔２６を跨ぐように、弁ケーシング１２内にて弁孔２６の周りに存する先端部１２ａの上流面に一体になるように設けられている。例えば、支持フレーム２０ａと弁ケーシング１２の先端部１２ａは金属材料を切削して一体に形成されている。このように支持フレーム２０ａと弁ケーシング１２の先端部１２ａは一体に形成されているため、支持フレーム２０ａに作用する力を弁ケーシング１２の先端部１２ａに全て伝達することができるので支持フレーム２０ａの強度が向上する。なお、支持フレーム２０ａと先端部１２ａを別体としてそれぞれ形成し、これらを溶接等にて接続してもよい。 The support portion 20 is provided on the upstream side of the valve seat 14 in the fluid supply direction, and slidably supports the valve rod 18 in the axial direction of the valve rod 18. In the present embodiment, the support portion 18 is composed of a support frame 20a and a support sleeve 20b.
The support frame 20a is fixed to the valve casing 12. The support frame 20a has a cross section 30 extending in a direction orthogonal to the axial direction of the valve casing 12. The area of the cross section 30 when viewed in the axial direction of the valve casing 12 is set to be as small as possible so as not to obstruct the flow of fluid as much as possible. For example, the support frame 20a has a U-shaped cross-sectional shape and is integrated with the upstream surface of the tip portion 12a existing around the valve hole 26 in the valve casing 12 so as to straddle the valve hole 26. It is provided. For example, the support frame 20a and the tip portion 12a of the valve casing 12 are integrally formed by cutting a metal material. Since the support frame 20a and the tip portion 12a of the valve casing 12 are integrally formed in this way, all the forces acting on the support frame 20a can be transmitted to the tip portion 12a of the valve casing 12, so that the support frame 20a can be used. Strength is improved. The support frame 20a and the tip portion 12a may be formed as separate bodies, and these may be connected by welding or the like.

また、横断部３０には、弁棒１８によって貫通される貫通孔３２が形成され、貫通孔３２に支持スリーブ２０ｂが挿入されている。支持スリーブ２０ｂは、一端に鍔を有する鍔付きの円筒形状を有し、横断部３０の上流側に支持スリーブ２０ｂの鍔が位置し、支持スリーブ２０ｂの筒部が貫通孔３２を貫通して下流側に向かって延びている。支持スリーブ２０ｂは、支持フレーム２０ａによって弁ケーシング１２と同軸に保持され、支持スリーブ２０ｂに弁棒１８が摺動自在に挿通されている。かくして、支持フレーム２０ａ及び支持スリーブ２０ｂによって、弁棒１８は、弁ケーシング１２と同軸に配置され、弁棒１８の軸線方向、あるいは弁ケーシング１２の軸線方向に摺動自在に支持されている。 Further, a through hole 32 penetrated by the valve rod 18 is formed in the crossing portion 30, and the support sleeve 20b is inserted into the through hole 32. The support sleeve 20b has a cylindrical shape with a collar having a collar at one end, the flange of the support sleeve 20b is located on the upstream side of the crossing portion 30, and the tubular portion of the support sleeve 20b penetrates the through hole 32 and downstream. It extends toward the side. The support sleeve 20b is held coaxially with the valve casing 12 by the support frame 20a, and the valve rod 18 is slidably inserted into the support sleeve 20b. Thus, the valve rod 18 is arranged coaxially with the valve casing 12 by the support frame 20a and the support sleeve 20b, and is slidably supported in the axial direction of the valve rod 18 or in the axial direction of the valve casing 12.

ばね座部２２は、弁棒１８の他端側に取り付けられ、弁ケーシング１２の軸線方向にて弁座１４に対し横断部３０よりも遠くに位置している。例えば、ばね座部２２は円環形状を有し、弁棒１８によって貫通されている。弁棒１８の他端側にはねじ山が設けられ、ナット３４が螺合されている。ナット３４はばね座部２２の抜け止めを構成している。
コイルばね２４は、圧縮コイルばねであり、支持スリーブ２０ｂの鍔とばね座部２２との間に配置されている。コイルばね２４は、支持部２０によって支持されながら、ばね座部２２、ナット３４及び弁棒１８を介して、弁体１６を弁座１４に向けて付勢している。 The spring seat portion 22 is attached to the other end side of the valve rod 18, and is located farther than the crossing portion 30 with respect to the valve seat 14 in the axial direction of the valve casing 12. For example, the spring seat portion 22 has an annular shape and is penetrated by a valve rod 18. A thread is provided on the other end side of the valve stem 18, and the nut 34 is screwed into the valve rod 18. The nut 34 constitutes a stopper for the spring seat portion 22.
The coil spring 24 is a compression coil spring and is arranged between the collar of the support sleeve 20b and the spring seat portion 22. While being supported by the support portion 20, the coil spring 24 urges the valve body 16 toward the valve seat 14 via the spring seat portion 22, the nut 34, and the valve rod 18.

従って、パイプ７を通じて供給される流体の圧力が低いとき、弁体１６のシール縁２８は弁座１４に接触しており、逆止弁付きノズル１０によって流路は閉じられる。一方、供給される流体の圧力が高くなると、弁体１６のシール縁２８が弁座１４から離れ、弁孔２６を通じて流体が吐出される。 Therefore, when the pressure of the fluid supplied through the pipe 7 is low, the seal edge 28 of the valve body 16 is in contact with the valve seat 14, and the flow path is closed by the nozzle 10 with a check valve. On the other hand, when the pressure of the supplied fluid becomes high, the seal edge 28 of the valve body 16 separates from the valve seat 14, and the fluid is discharged through the valve hole 26.

ここで、弁体１６のシール縁２８及び弁座１４は、閉弁時に相互に線接触可能な形状を有する。
上記構成によれば、弁体１６は弁座１４に線接触するので、土砂や骨材等を挟み込む可能性が少ない。また、土砂や骨材等を挟み込んだ場合にも、コイルばね２４の力が弁体１６の外周部分、即ち線接触するシール縁２８に集中するため、土砂や骨材等を砕いて除去することができる。このため、良好なシール性を維持することができる。
また、万が一、土砂や骨材等を挟み込んでも、弁座１４が下流側に向けられており、弁座１４と弁体１６が露出しているため、土砂や骨材等を短時間で容易に除去することができる。
さらに、弁棒１８が支持部２０によって摺動自在に支持されていることにより弁棒１８は直進性に優れており、逆止弁付きノズル１０の径方向（弁ケーシング１２の径方向）に傾く事を抑制できる。このため、弁座１４からの弁体１６のリフト量が弁体１６の周方向にて均一になり、開弁時に弁体１６と弁座１４の隙間からコンクリート等を弁座１４の外周方向に均等に供給することができる。したがって、杭孔内に供給されたコンクリート等を撹拌する場合、撹拌の作業時間を従来よりも大幅に短縮することができる。 Here, the seal edge 28 and the valve seat 14 of the valve body 16 have a shape that allows line contact with each other when the valve is closed.
According to the above configuration, since the valve body 16 is in line contact with the valve seat 14, there is little possibility of sandwiching earth and sand, aggregate, or the like. Further, even when the earth and sand, the aggregate, etc. are sandwiched, the force of the coil spring 24 is concentrated on the outer peripheral portion of the valve body 16, that is, the seal edge 28 in line contact, so that the earth and sand, the aggregate, etc. are crushed and removed. Can be done. Therefore, good sealing properties can be maintained.
Further, even if the earth and sand, the aggregate, etc. are sandwiched, the valve seat 14 is directed to the downstream side, and the valve seat 14 and the valve body 16 are exposed, so that the earth and sand, the aggregate, etc. can be easily removed in a short time. Can be removed.
Further, since the valve rod 18 is slidably supported by the support portion 20, the valve rod 18 has excellent straightness and is inclined in the radial direction of the nozzle 10 with a check valve (the radial direction of the valve casing 12). You can suppress things. Therefore, the lift amount of the valve body 16 from the valve seat 14 becomes uniform in the circumferential direction of the valve body 16, and when the valve is opened, concrete or the like is poured from the gap between the valve body 16 and the valve seat 14 toward the outer peripheral direction of the valve seat 14. Can be supplied evenly. Therefore, when the concrete or the like supplied into the pile hole is agitated, the agitation work time can be significantly shortened as compared with the conventional case.

幾つかの実施形態では、図３及び図４に示したように、弁座１４は下流に向けて拡開するテーパ面によって構成されている。すなわち、弁座１４は雌テーパ面によって構成されている。弁体１６のシール縁２８の直径は、弁座１４の雌テーパ面の最小径よりも大きく、弁座１４の雌テーパ面の最大径よりも小さい。 In some embodiments, as shown in FIGS. 3 and 4, the valve seat 14 is configured with a tapered surface that expands downstream. That is, the valve seat 14 is composed of a female tapered surface. The diameter of the seal edge 28 of the valve body 16 is larger than the minimum diameter of the female tapered surface of the valve seat 14 and smaller than the maximum diameter of the female tapered surface of the valve seat 14.

上記構成の逆止弁付きノズル１０によれば、弁座１４がテーパ面によって構成されているので、開弁時に弁体１６と弁座１４の隙間からコンクリート等を弁座１４の外周方向により多く供給することができる。
また上記構成の逆止弁付きノズル１０が適用されたビット付きケーシング１によれば、掘削した土砂がパイプ７によって構成される流路内へ浸入することを逆止弁付きノズル１０によって防止することができるとともに、掘削液、安定液又はセメントミルク等の流体を、逆流を防止しながら流路を通じて杭孔内に供給することができる。 According to the nozzle 10 with a check valve having the above configuration, since the valve seat 14 is formed of a tapered surface, more concrete or the like is added to the outer peripheral direction of the valve seat 14 from the gap between the valve body 16 and the valve seat 14 when the valve is opened. Can be supplied.
Further, according to the casing 1 with a bit to which the nozzle 10 with a check valve having the above configuration is applied, the nozzle 10 with a check valve prevents the excavated earth and sand from entering the flow path formed by the pipe 7. At the same time, a fluid such as excavation liquid, stabilizing liquid or cement milk can be supplied into the pile hole through the flow path while preventing backflow.

図７は、本発明の他の一実施形態に係る逆止弁付き杭構築装置として、逆止弁付きノズル５０が適用された掘削ドリル４０を概略的に示す側面図である。なお、以下の実施形態の説明では、先に説明した構成と同一又は類似の構成については、同一の名称及び／又は符号を付して説明を簡略化又は省略する。 FIG. 7 is a side view schematically showing an excavation drill 40 to which a nozzle 50 with a check valve is applied as a pile construction device with a check valve according to another embodiment of the present invention. In the following embodiments, the same or similar configurations as those described above will be given the same name and / or reference numerals to simplify or omit the description.

掘削ドリル４０は、円筒形状の胴部４２と、胴部４２と一体に設けられた翼部４４と、翼部４４と一体に設けられたビット４６とを備えている。胴部４２の内部には、胴部４２を軸線方向に貫通する貫通孔４８が設けられている。貫通孔４８は流体を供給するための流路を構成しており、流路を通じて杭孔内に流体を供給可能である。流体としては、掘削液としての水、ベンドナイトを含む安定液、又は、セメントミルク等をあげることができる。
そして、胴部４２の下端部に、流路を開閉可能な逆止弁付きノズル５０が取り付けられている。 The excavation drill 40 includes a cylindrical body portion 42, a wing portion 44 provided integrally with the body portion 42, and a bit 46 provided integrally with the wing portion 44. Inside the body portion 42, a through hole 48 that penetrates the body portion 42 in the axial direction is provided. The through hole 48 constitutes a flow path for supplying the fluid, and the fluid can be supplied into the pile hole through the flow path. Examples of the fluid include water as an excavation liquid, a stabilizer containing bendonite, cement milk and the like.
A nozzle 50 with a check valve capable of opening and closing the flow path is attached to the lower end of the body portion 42.

図８は、掘削ドリル４０に適用された逆止弁付きノズル５０の閉弁時の概略的な縦断面図である。図９は、図８の逆止弁付きノズル５０の開弁時の概略的な縦断面図である。図１０は、図８の逆止弁付きノズル５０の概略的な上面図である。図１１は、図８の逆止弁付きノズル５０の概略的な下面図である。 FIG. 8 is a schematic vertical sectional view of the nozzle 50 with a check valve applied to the excavation drill 40 when the valve is closed. FIG. 9 is a schematic vertical sectional view of the nozzle 50 with a check valve of FIG. 8 when the valve is opened. FIG. 10 is a schematic top view of the nozzle 50 with a check valve of FIG. FIG. 11 is a schematic bottom view of the nozzle 50 with a check valve of FIG.

図８〜図１１に示したように、逆止弁付きノズル５０は、仕切板５２と、弁座５４と、弁体５６と、弁棒１８と、支持部２０と、ばね座部２２と、コイルばね２４とを備えている。 As shown in FIGS. 8 to 11, the check valve nozzle 50 includes a partition plate 52, a valve seat 54, a valve body 56, a valve rod 18, a support portion 20, and a spring seat portion 22. It is provided with a coil spring 24.

仕切板５２は、環板形状を有し、流路の出口を絞るように、例えばボルトによって胴部４２に取り付けられている。仕切板５２は、胴部４２とともに弁ハウジングを構成している。仕切板５２の中央孔は弁孔５８として機能する。
仕切板５２の外面には、弁孔５８を囲むように円筒形状の囲繞壁６４が同軸且つ一体に設けられ、囲繞壁６４の下流側の内周面は雌テーパ面形状の弁座５４を構成している。
弁体５６は、弁孔５８よりも大径の円盤形状を有し、弁体５６の内面の外周部はシール縁６０を構成している。弁体５６のシール縁６０及び弁座５４は、相互に線接触可能な形状を有している。 The partition plate 52 has a ring plate shape and is attached to the body portion 42 by, for example, a bolt so as to narrow the outlet of the flow path. The partition plate 52 constitutes a valve housing together with the body portion 42. The central hole of the partition plate 52 functions as a valve hole 58.
A cylindrical surrounding wall 64 is coaxially and integrally provided on the outer surface of the partition plate 52 so as to surround the valve hole 58, and the inner peripheral surface on the downstream side of the surrounding wall 64 constitutes a valve seat 54 having a female tapered surface shape. is doing.
The valve body 56 has a disk shape having a diameter larger than that of the valve hole 58, and the outer peripheral portion of the inner surface of the valve body 56 constitutes a seal edge 60. The seal edge 60 and the valve seat 54 of the valve body 56 have a shape that allows line contact with each other.

上記構成によれば、弁体５６は弁座５４に線接触するので、土砂や骨材等を挟み込む可能性が少ない。また、土砂や骨材等を挟み込んだ場合にも、コイルばね２４の力が弁体５６の外周部分、即ち線接触するシール縁６０に集中するため、土砂や骨材等を砕いて除去することができる。このため、良好なシール性を維持することができる。
また、万が一、土砂や骨材等を挟み込んでも、弁座５４が下流側に向けられており、弁座５４と弁体５６が露出しているため、土砂や骨材等を短時間で容易に除去することができる。
さらに、弁棒１８が支持部２０によって摺動自在に支持されていることにより弁棒１８は直進性に優れており、逆止弁付きノズル５０の径方向（弁ハウジングの径方向）に傾く事を抑制できる。このため、弁座５４からの弁体５６のリフト量が弁体５６の周方向にて均一になり、開弁時に弁体５６と弁座５４の隙間からコンクリート等を弁座５４の外周方向に均等に供給することができる。したがって、杭孔内に供給されたコンクリート等を撹拌する場合、撹拌の作業時間を従来よりも大幅に短縮することができる。
また、上記構成の逆止弁付きノズル５０が適用された掘削ドリル４０によれば、掘削した土砂が掘削ドリル４０の流路内へ浸入することを防止することができるとともに、逆流を防止しながら流路を通じて掘削液、安定液又はセメントミルク等の流体を杭孔内に供給することができる。 According to the above configuration, since the valve body 56 is in line contact with the valve seat 54, there is little possibility of sandwiching earth and sand, aggregate, or the like. Further, even when the earth and sand, the aggregate, etc. are sandwiched, the force of the coil spring 24 is concentrated on the outer peripheral portion of the valve body 56, that is, the seal edge 60 in line contact, so that the earth and sand, the aggregate, etc. are crushed and removed. Can be done. Therefore, good sealing properties can be maintained.
Further, even if the earth and sand, the aggregate, etc. are sandwiched, the valve seat 54 is directed to the downstream side, and the valve seat 54 and the valve body 56 are exposed, so that the earth and sand, the aggregate, etc. can be easily removed in a short time. Can be removed.
Further, since the valve rod 18 is slidably supported by the support portion 20, the valve rod 18 is excellent in straightness and tilts in the radial direction (diametrical direction of the valve housing) of the nozzle 50 with a check valve. Can be suppressed. Therefore, the lift amount of the valve body 56 from the valve seat 54 becomes uniform in the circumferential direction of the valve body 56, and when the valve is opened, concrete or the like is poured from the gap between the valve body 56 and the valve seat 54 toward the outer peripheral direction of the valve seat 54. Can be supplied evenly. Therefore, when the concrete or the like supplied into the pile hole is agitated, the agitation work time can be significantly shortened as compared with the conventional case.
Further, according to the excavation drill 40 to which the nozzle 50 with a check valve having the above configuration is applied, it is possible to prevent the excavated earth and sand from entering the flow path of the excavation drill 40, and while preventing backflow. A fluid such as excavation liquid, stabilizer or cement milk can be supplied into the pile hole through the flow path.

幾つかの実施形態では、胴部４２の下端面には、貫通孔４８及び仕切板５２よりも大径の円柱形状の凹所６２が形成されている。凹所６２は貫通孔４８と同軸に形成され、凹所６２の底面の中央に貫通孔４８が開口している。そして、凹所６２の深さは、開弁状態でも弁体５６が凹所６２内に収まるように設定されている。
上記構成によれば、弁体５６が胴部４２の下端面よりも下方に突出することがないので、弁体５６が損傷することを防止することができる。 In some embodiments, the lower end surface of the body portion 42 is formed with a through hole 48 and a cylindrical recess 62 having a diameter larger than that of the partition plate 52. The recess 62 is formed coaxially with the through hole 48, and the through hole 48 is opened in the center of the bottom surface of the recess 62. The depth of the recess 62 is set so that the valve body 56 fits within the recess 62 even in the valve open state.
According to the above configuration, since the valve body 56 does not protrude below the lower end surface of the body portion 42, it is possible to prevent the valve body 56 from being damaged.

図１２は、本発明の他の一実施形態に係る逆止弁付き杭構築装置として、逆止弁付きノズル５０が適用されたトレミー管７０を概略的に示す側面図である。図１３は、トレミー管７０に適用された逆止弁付きノズル５０の閉弁時の概略的な縦断面図である。 FIG. 12 is a side view schematically showing a tremie pipe 70 to which a nozzle 50 with a check valve is applied as a pile construction device with a check valve according to another embodiment of the present invention. FIG. 13 is a schematic vertical sectional view of the nozzle 50 with a check valve applied to the tremie pipe 70 when the valve is closed.

図１２及び図１３に示したように、トレミー管７０は、それ自体がコンクリート等の流体の流路を構成している。トレミー管７０は、例えば一端にフランジ部７２を有し、フランジ部７２に逆止弁付きノズル５０がボルトによって固定される。
上記構成の逆止弁付きノズル５０が適用されたトレミー管７０によれば、杭孔に貯まった水がトレミー管７０の流路内へ浸入するのを防止することができるとともに、逆流を防止しながら流路を通じてコンクリートを杭孔内に供給することができる。 As shown in FIGS. 12 and 13, the tremie pipe 70 itself constitutes a flow path for a fluid such as concrete. The tremie pipe 70 has, for example, a flange portion 72 at one end, and a nozzle 50 with a check valve is fixed to the flange portion 72 by bolts.
According to the tremie pipe 70 to which the nozzle 50 with a check valve having the above configuration is applied, it is possible to prevent the water accumulated in the pile hole from entering the flow path of the tremie pipe 70 and prevent the backflow. However, concrete can be supplied into the pile hole through the flow path.

図１４は、本発明の他の一実施形態に係る逆止弁付きノズル８０の閉弁時の概略的な縦断面図である。
逆止弁付きノズル８０は、支持部８２が平坦な板形状の横断部８４によって構成され、横断部８４の両端が弁ケーシング１２に固定されている点において、逆止弁付きノズル１０と異なっている。
逆止弁付きノズル８０においても、逆止弁付きノズル５０と同様、良好なシール性が確保される。 FIG. 14 is a schematic vertical sectional view of the nozzle 80 with a check valve according to another embodiment of the present invention when the valve is closed.
The check valve nozzle 80 differs from the check valve nozzle 10 in that the support portion 82 is composed of a flat plate-shaped cross section 84, and both ends of the cross section 84 are fixed to the valve casing 12. There is.
The nozzle 80 with a check valve also ensures good sealing performance as in the nozzle 50 with a check valve.

図１５は、本発明の他の一実施形態に係る逆止弁付きノズル９０の閉弁時の概略的な縦断面図である。
逆止弁付きノズル９０は、円筒形状のカバー９２によって、弁棒１８の他端側及びコイルばね２４が覆われている点において、逆止弁付きノズル５０と異なっている。カバー９２は、例えば支持部２０に固定されている。
逆止弁付きノズル９０においても、逆止弁付きノズル５０と同様、良好なシール性が確保される。
また、逆止弁付きノズル９０においては、カバー９２によってコイルばね２４が覆われているので、コイルばね２４の隙間に骨材等が詰まることが防止される。この結果、逆止弁付きノズル９０は、流体の性状にかかわらずに安定して動作可能である。 FIG. 15 is a schematic vertical sectional view of the nozzle 90 with a check valve according to another embodiment of the present invention when the valve is closed.
The check valve nozzle 90 differs from the check valve nozzle 50 in that the other end of the valve stem 18 and the coil spring 24 are covered by a cylindrical cover 92. The cover 92 is fixed to, for example, the support portion 20.
The nozzle 90 with a check valve also ensures good sealing performance as in the nozzle 50 with a check valve.
Further, in the nozzle 90 with a check valve, since the coil spring 24 is covered with the cover 92, it is possible to prevent the aggregate or the like from being clogged in the gap between the coil spring 24. As a result, the nozzle 90 with a check valve can operate stably regardless of the properties of the fluid.

以下、本発明の一実施形態として、上述した逆止弁付き杭構築装置を用いた杭構築方法について説明する。
杭構築方法は、杭構築装置の流路及び逆止弁付きノズル１０，５０，８０，９０を通じて杭孔内に流体を供給する流体供給工程を備えている。
上記構成によれば、弁体１６，５６は弁座１４，５４に線接触するので、土砂や骨材等を挟み込む可能性が少ない。また、土砂や骨材等を挟み込んだ場合にも、コイルばね２４の力が弁体１６，５６の外周部分、即ち線接触するシール縁２８，６０に集中するため、土砂や骨材等を砕いて除去することができる。このため、良好なシール性を維持することができる。
また、万が一、土砂や骨材等を挟み込んでも、弁座１４，５４が下流側に向けられており、弁座１４，５４と弁体１６，５６が露出しているため、土砂や骨材等を短時間で容易に除去することができる。
さらに、弁棒１８が支持部２０によって摺動自在に支持されていることにより弁棒１８は直進性に優れており、逆止弁付きノズル１０，５０，８０，９０の径方向（弁ケーシング１２や弁ハウジングの径方向）に傾く事を抑制できる。このため、弁座１４，５４からの弁体１６，５６のリフト量が弁体１６，５６の周方向にて均一になり、開弁時に弁体１６，５６と弁座１４，５４の隙間からコンクリート等を弁座１４，５４の外周方向に均等に供給することができる。したがって、杭孔内に供給されたコンクリート等を撹拌する場合、撹拌の作業時間を従来よりも大幅に短縮することができる。
なお、杭構築方法は、場所打ち杭の構築のみならず、既製杭を用いた基礎杭の構築にも適用可能である。 Hereinafter, as an embodiment of the present invention, a pile construction method using the above-mentioned check valve-equipped pile construction device will be described.
The pile construction method includes a fluid supply step of supplying fluid into the pile hole through a flow path of the pile construction device and nozzles 10, 50, 80, 90 with a check valve.
According to the above configuration, since the valve bodies 16 and 56 are in line contact with the valve seats 14 and 54, there is little possibility of sandwiching earth and sand or aggregate. Further, even when earth and sand, aggregate, etc. are sandwiched, the force of the coil spring 24 is concentrated on the outer peripheral portions of the valve bodies 16, 56, that is, the seal edges 28, 60, which are in line contact with each other, so that the earth and sand, aggregate, etc. are crushed. Can be removed. Therefore, good sealing properties can be maintained.
In addition, even if earth and sand, aggregate, etc. are sandwiched, the valve seats 14, 54 are directed to the downstream side, and the valve seats 14, 54 and the valve bodies 16, 56 are exposed, so that earth and sand, aggregate, etc. Can be easily removed in a short time.
Further, since the valve rod 18 is slidably supported by the support portion 20, the valve rod 18 has excellent straightness, and the nozzles 10, 50, 80, 90 with a check valve are radially supported (valve casing 12). And can prevent tilting in the radial direction of the valve housing). Therefore, the lift amount of the valve bodies 16, 56 from the valve seats 14, 54 becomes uniform in the circumferential direction of the valve bodies 16, 56, and from the gap between the valve bodies 16, 56 and the valve seats 14, 54 at the time of valve opening. Concrete or the like can be evenly supplied in the outer peripheral direction of the valve seats 14 and 54. Therefore, when the concrete or the like supplied into the pile hole is agitated, the agitation work time can be significantly shortened as compared with the conventional case.
The pile construction method can be applied not only to the construction of cast-in-place piles but also to the construction of foundation piles using ready-made piles.

幾つかの実施形態では、杭構築装置はビット付きケーシング１であり、流体供給工程において供給される流体は掘削液、安定液又はセメントミルクである。
上記構成によれば、掘削した土砂がビット付きケーシング１の流路内へ浸入するのを防止することができるとともに、掘削液、安定液又はセメントミルク等の流体を、逆流を防止しながら流路を通じて杭孔内に供給することができる。
なお、掘削液又は安定液は、ビット付きケーシング１によって杭孔を掘削している間に供給され、セメントミルクは、杭孔内に沈設される既製杭の周囲に根固め部又は杭周部を形成する際に供給される。 In some embodiments, the pile building device is a casing 1 with bits and the fluid supplied in the fluid supply process is excavation fluid, stabilizing fluid or cement milk.
According to the above configuration, it is possible to prevent the excavated earth and sand from infiltrating into the flow path of the casing 1 with a bit, and the flow path of the excavated liquid, the stabilizing liquid or the fluid such as cement milk while preventing the backflow. It can be supplied into the pile hole through.
The excavation liquid or the stabilizing liquid is supplied while excavating the pile hole by the casing 1 with a bit, and the cement milk is used to form a solidified portion or a pile peripheral portion around the ready-made pile sunk in the pile hole. Supplied during formation.

幾つかの実施形態では、杭構築装置は掘削ドリル４０であり、流体供給工程において供給される流体は、掘削液、安定液又はセメントミルクである。
上記構成によれば、掘削した土砂が掘削ドリル４０の流路内へ浸入するのを防止することができるとともに、掘削液、安定液又はセメントミルク等の流体を、逆流を防止しながら流路を通じて杭孔内に供給することができる。
なお、掘削液又は安定液は、掘削ドリル４０によって杭孔を掘削している間に供給され、セメントミルクは、杭孔内に沈設される既製杭の周囲に根固め部又は杭周部を形成する際に供給される。 In some embodiments, the pile building device is a drill 40 and the fluid supplied in the fluid supply process is drilling fluid, stabilizing fluid or cement milk.
According to the above configuration, it is possible to prevent the excavated earth and sand from infiltrating into the flow path of the excavation drill 40, and at the same time, the excavation liquid, the stabilizing liquid or the fluid such as cement milk can be prevented from flowing back through the flow path. It can be supplied into the pile hole.
The excavation liquid or the stabilizing liquid is supplied while excavating the pile hole by the excavation drill 40, and the cement milk forms a solidified portion or a pile peripheral portion around the ready-made pile sunk in the pile hole. It is supplied when you do.

幾つかの実施形態では、杭構築装置はトレミー管７０であり、流体供給工程において供給される流体はコンクリートである。
上記構成によれば、杭孔に貯まった水がトレミー管７０の流路内へ浸入するのを防止することができるとともに、逆流を防止しながら流路を通じてコンクリートを杭孔内に供給することができる。 In some embodiments, the pile building device is a tremie pipe 70 and the fluid supplied in the fluid supply process is concrete.
According to the above configuration, it is possible to prevent the water accumulated in the pile hole from entering the flow path of the tremie pipe 70, and to supply concrete into the pile hole through the flow path while preventing backflow. can.

最後に、本発明は上述した幾つかの実施形態に限定されることはなく、上述した実施形態に変形を加えた形態や、これらの形態を適宜組み合わせた形態も含む。
例えば、逆止弁付きノズル１０，５０，８０，９０のコイルばね２４は圧縮コイルばねであったが、配置を変更することにより、引っ張りコイルばねを用いることも可能である。 Finally, the present invention is not limited to some of the above-described embodiments, and includes a modified form of the above-mentioned embodiment and a form in which these forms are appropriately combined.
For example, the coil spring 24 of the nozzles 10, 50, 80, 90 with a check valve was a compression coil spring, but it is also possible to use a tension coil spring by changing the arrangement.

１ビット付きケーシング
３本体部
５，４６ビット
７パイプ
１０，５０，８０，９０逆止弁付きノズル
１２弁ケーシング
１２ａ先端部
１２ｂ基端部
１４，５４弁座
１６，５６弁体
１８弁棒
２０，８２支持部
２０ａ支持フレーム
２０ｂ支持スリーブ
２２ばね座部
２４コイルばね
２６，５８弁孔
２８，６０シール縁
３０，８４横断部
３２貫通孔
３４ナット
４０掘削ドリル
４２胴部
４４翼部
４８貫通孔
５２仕切板
６２凹所
６４囲繞壁
７０トレミー管
７２フランジ部
９２カバー 1 Casing with bit 3 Main body 5,46 Bit 7 Pipe 10,50,80,90 Nozzle with check valve 12 Valve casing 12a Tip 12b Base end 14,54 Valve seat 16,56 Valve body 18 Valve rod 20, 82 Support part 20a Support frame 20b Support sleeve 22 Spring seat part 24 Coil spring 26,58 Valve hole 28,60 Seal edge 30,84 Crossing part 32 Through hole 34 Nut 40 Drilling drill 42 Body part 44 Wing part 48 Through hole 52 Partition Plate 62 Recess 64 Surrounding wall 70 Tremy pipe 72 Flange 92 Cover

Claims

A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided on the upstream side of the valve seat in the fluid supply direction and slidably supporting the valve rod in the axial direction of the valve rod, and a support portion.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is a casing with a bit.
The casing with a bit
Cylindrical casing and
A bit attached to one end of the casing and
A pipe arranged on the outer peripheral surface of the casing and constituting the flow path,
Pile construction apparatus with a check valve characterized that you provided with.

A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided on the upstream side of the valve seat in the fluid supply direction and slidably supporting the valve rod in the axial direction of the valve rod, and a support portion.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is an excavation drill.
The excavation drill has a body on which the flow path is formed and a body.
A wing portion provided integrally with the body portion and
A bit provided integrally with the wing and
Check valve with pile construction device you comprising: a.

A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided on the upstream side of the valve seat in the fluid supply direction and slidably supporting the valve rod in the axial direction of the valve rod, and a support portion.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is a tremie pipe constituting the flow path.
Check valve with pile construction device you wherein a.

A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction method using a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
A fluid supply step of supplying fluid into the pile hole through the flow path and the check valve nozzle is provided.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided upstream of the valve seat in the fluid supply direction and penetrated by slidably supporting the valve rod in the axial direction of the valve rod.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is a casing with a bit.
In the fluid supply step, a drilling liquid, a stabilizing liquid or cement milk is supplied as the fluid.
A pile construction method characterized by that.

A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction method using a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
A fluid supply step of supplying fluid into the pile hole through the flow path and the check valve nozzle is provided.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided upstream of the valve seat in the fluid supply direction and penetrated by slidably supporting the valve rod in the axial direction of the valve rod.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is an excavation drill.
In the fluid supply step, a drilling liquid, a stabilizing liquid or cement milk is supplied as the fluid.
Pile construction how to, characterized in that.

A pile construction device with a flow path for supplying fluid in the pile hole,
In a pile construction method using a pile construction device with a check valve provided with a nozzle with a check valve attached to the pile construction device so as to open and close the flow path.
A fluid supply step of supplying fluid into the pile hole through the flow path and the check valve nozzle is provided.
The nozzle with a check valve is
An annular valve seat facing downstream in the fluid supply direction,
A valve body having a seal edge that can be attached to and detached from the valve seat,
A valve rod having one end connected to the valve body and extending from the valve body toward the upstream side in the fluid supply direction.
A support portion provided upstream of the valve seat in the fluid supply direction and penetrated by slidably supporting the valve rod in the axial direction of the valve rod.
A spring seat attached to the other end of the valve stem,
A coil spring, which is arranged between the support portion and the spring seat portion and urges the valve body toward the valve seat, is provided.
When the valve is closed, the valve body is in line contact with the valve seat, and the valve body is in line contact with the valve seat.
The pile construction device is a tremie pipe,
In the fluid supply step, concrete is supplied as the fluid.
Pile construction how to, characterized in that.