JP7195613B2 - Insulation material used in cast-in-place pile construction method, core material provided with same, and construction method for cast-in-place pile - Google Patents

Insulation material used in cast-in-place pile construction method, core material provided with same, and construction method for cast-in-place pile Download PDF

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JP7195613B2
JP7195613B2 JP2019164113A JP2019164113A JP7195613B2 JP 7195613 B2 JP7195613 B2 JP 7195613B2 JP 2019164113 A JP2019164113 A JP 2019164113A JP 2019164113 A JP2019164113 A JP 2019164113A JP 7195613 B2 JP7195613 B2 JP 7195613B2
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晃 岡本
平一 車
鎬達 星山
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株式会社Ｅ・Ｃ・Ｓ
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本発明は、場所打ち杭工法において用いられる遮断材、これを備えた芯材、及び場所打ち杭の施工方法に関する。 TECHNICAL FIELD The present invention relates to a blocking material used in a cast-in-place pile construction method, a core material having the same, and a construction method for a cast-in-place pile.

建築物の基礎杭を施工する場所打ち杭工法では、掘削した杭孔内に鉄筋籠等の芯材を建込み、未硬化の杭材料を打設することで基礎杭を施工する。このような場所打ち杭工法にはオールケーシング工法やリバース工法，アースドリル工法等、種々の工法がある。 In the cast-in-place pile construction method for constructing the foundation piles of a building, a core material such as a reinforcing bar cage is placed in an excavated pile hole, and the foundation pile is constructed by driving an unhardened pile material. Such cast-in-place pile construction methods include various construction methods such as the all-casing construction method, the reverse construction method, and the earth drill construction method.

例えば、オールケーシング工法ではケーシングチューブを揺動又は回転させつつ地中に押し込み、ケーシングチューブ内の土砂を掘削して排出する。次に、芯材としての鉄筋籠をケーシングチューブ内に挿入し、生コンクリート（杭材料）を打設しながらケーシングチューブを引き抜いて回収する。その後、コンクリートが硬化して芯材と一体化することにより場所打ち杭が完成する（例えば、特許文献１参照）。鉄筋籠は、環状に並列配置された複数本の主筋と、これら複数の主筋を連結する複数本の環状のフープ筋（帯筋）と、を備えて構成されている（例えば、特許文献２参照）。また、ＢＨ工法においてはＨ型鋼を芯材として用い、モルタルを杭材料として打設する場合もある。 For example, in the all-casing construction method, the casing tube is pushed into the ground while rocking or rotating, and the earth and sand inside the casing tube are excavated and discharged. Next, a reinforcing bar cage as a core material is inserted into the casing tube, and the casing tube is pulled out and recovered while pouring ready-mixed concrete (pile material). After that, the concrete hardens and integrates with the core material to complete the cast-in-place pile (see Patent Document 1, for example). A reinforcing bar cage comprises a plurality of main reinforcements arranged in parallel in a circular fashion and a plurality of annular hoop reinforcements (tie bars) connecting the plurality of main reinforcements (see, for example, Patent Document 2). ). In the BH construction method, H-shaped steel is used as a core material, and mortar is used as a pile material in some cases.

特開２００６－８３５７３Japanese Patent Application Laid-Open No. 2006-83573 特開２０１７－１５０２６５JP 2017-150265

しかしながら、鉄筋籠は骨組み構造であるから、上述したようなオールケーシング工法においてケーシングチューブが引き抜かれると、打設された生コンクリートは掘削された地盤周面に対して露出する。この状態で地盤周面から地下水等が流れ出ると、未硬化のコンクリートと混ざり、杭の強度が低下してしまう。よって、このような事態が想定される場合には、ケーシングチューブの引き抜きは行わず、地中に放置することもあった。 However, since the reinforcing bar cage is a frame structure, when the casing tube is pulled out in the above-described all-casing construction method, the placed ready-mixed concrete is exposed to the excavated ground surface. If groundwater or the like flows out from the ground surface in this state, it will mix with the unhardened concrete and the strength of the pile will decrease. Therefore, when such a situation is expected, the casing tube is sometimes left in the ground without being pulled out.

また、このように未硬化の杭材料に異物が混入することによる杭の品質低下はオールケーシング工法に限らず、他の場所打ち杭工法においても同様であった。例えば、上述のＢＨ工法においても、打設されたモルタルに地下水等が混入すると、杭の品質が低下してしまう。 In addition, the deterioration of the quality of piles due to foreign substances mixed in the unhardened pile material is not limited to the all-casing construction method, but is the same in other cast-in-place pile construction methods. For example, even in the BH construction method described above, if groundwater or the like is mixed into the placed mortar, the quality of the pile will be degraded.

本発明は、場所打ち杭工法において地下水等が未硬化の杭材料に混入して杭の品質が低下するのを防止することのできる遮断材、これを備えた芯材、及び場所打ち杭の施工方法の提供を目的とする。 The present invention provides a blocking material that can prevent the quality of the pile from deteriorating due to the mixing of groundwater and the like into the unhardened pile material in the cast-in-place pile construction method, the core material having the same, and the construction of the cast-in-place pile. It aims at providing a method.

本発明に係る遮断材は、場所打ち杭の施工時に杭孔に挿入される芯部材の外周を覆う遮断材であって、前記芯部材に固定された状態で前記芯部材と共に前記杭孔に挿入される。 The blocking material according to the present invention is a blocking material that covers the outer periphery of a core member that is inserted into a pile hole during construction of a cast-in-place pile, and is inserted into the pile hole together with the core member while being fixed to the core member. be done.

また、本発明に係る芯材は、場所打ち杭の施工時に杭孔に挿入される芯部材と、前記芯部材に固定されて前記芯部材の外周を覆う遮断材と、を備える。 Further, the core material according to the present invention includes a core member that is inserted into a pile hole during construction of a cast-in-place pile, and a shielding material that is fixed to the core member and covers the outer periphery of the core member.

また、本発明にかかる場所打ち杭の施工方法は、抗孔を掘削する工程と、前記杭孔に芯材を挿入する工程と、前記杭孔に杭材料を打設する工程と、を含み、前記芯材は、芯部材と、前記芯部材の周面を覆う遮断材と、を有し、前記遮断材は前記芯部材と共に杭孔内に放置される。 In addition, a cast-in-place pile construction method according to the present invention includes the steps of excavating a hole, inserting a core material into the pile hole, and driving a pile material into the pile hole, The core member has a core member and a blocking member covering the peripheral surface of the core member, and the blocking member is left in the pile hole together with the core member.

本発明に係る遮断材は、芯部材の外周を覆い、芯部材と共に杭孔に挿入されるので、場所打ち杭の施工時において、打設された未硬化の杭材料と掘削された地盤周面との間に遮断材が介在することになる。よって、地盤周面から染み出た地下水や不純物等が杭材料に混入するのを防止して、杭の品質低下を防止できる。 The shielding material according to the present invention covers the outer periphery of the core member and is inserted into the pile hole together with the core member. A shielding material is interposed between the Therefore, it is possible to prevent groundwater, impurities, and the like seeped from the ground surface from being mixed into the pile material, thereby preventing quality deterioration of the pile.

本発明に係る芯材によれば芯部材と、芯部材の外周を覆う遮断材と、を備えるので、上述したのと同様の効果を得ることができる。また、本発明にかかる場所打ち杭の施工方法によれば、芯部材の周面が遮断材で覆われた芯材を用いるので、上述したのと同様の効果を得ることができる。更に、遮断材は芯部材と共に杭孔内に放置されるので、遮断材を回収する手間がかからず杭の施工工程を簡略化できる。なお、このように放置された遮断材は杭材料が硬化することによって杭材料と一体化して基礎杭を構成する。 According to the core member according to the present invention, since the core member and the shielding material covering the outer periphery of the core member are provided, the same effect as described above can be obtained. Moreover, according to the construction method of the cast-in-place pile according to the present invention, since the core member whose peripheral surface is covered with the shielding material is used, the same effect as described above can be obtained. Furthermore, since the shielding material is left in the pile hole together with the core member, it is not necessary to collect the shielding material, and the pile construction process can be simplified. The shielding material left in this way forms a foundation pile by being integrated with the pile material as the pile material hardens.

なお、本発明において杭材料とは、硬化することによって杭を構成するものであればよく、例えばコンクリートやモルタル等が含まれる。また、本発明において芯部材とは、杭孔に挿入されてコンクリート杭やモルタル杭等の芯を構成するものを言い、例えば鉄筋籠や形鋼等が含まれる。 In the present invention, the pile material may be any material that constitutes a pile by hardening, and includes, for example, concrete and mortar. In the present invention, the term "core member" refers to a member that is inserted into a pile hole to constitute the core of a concrete pile, a mortar pile, or the like, and includes, for example, a reinforcing bar cage, shaped steel, and the like.

本発明の実施形態に係る芯材を示す概略斜視図。BRIEF DESCRIPTION OF THE DRAWINGS The schematic perspective view which shows the core material which concerns on embodiment of this invention. 図１のＩＩーＩＩ線断面図。II-II line sectional drawing of FIG. 図１に示す芯材から遮断材を取り外した状態を示す概略斜視図。FIG. 2 is a schematic perspective view showing a state in which a blocking material is removed from the core material shown in FIG. 1; 図２のＩＶーＩＶ線断面図。IV-IV line sectional drawing of FIG. 図１に示す芯材が備える遮断材の概略展開斜視図。FIG. 2 is a schematic exploded perspective view of a blocking material included in the core material shown in FIG. 1; 本発明の変形形態に係る芯材の部分縦断面図。FIG. 4 is a partial vertical cross-sectional view of a core material according to a modification of the present invention; 本発明の他の変形形態に係る芯材の部分横断面図。FIG. 4 is a partial cross-sectional view of a core material according to another modification of the present invention; 本発明の更に他の変形形態に係る芯材の部分横断面図。FIG. 11 is a partial cross-sectional view of a core material according to still another modification of the present invention;

以下、添付図面を参照して、本発明の実施形態に係る芯材及びこれを用いた場所打ち杭の施工方法について説明する。図１及び図２を参照して、本実施形態に係る芯材１は、場所打ち杭の施工時に杭孔に挿入されるものであって、芯部材２と、芯部材２の外周を覆う遮断材３と、を備える。本実施形態においては芯部材２として鉄筋籠を用いる。 Hereinafter, with reference to an accompanying drawing, a construction method of a core material concerning an embodiment of the present invention and a cast-in-place pile using the same is explained. 1 and 2, a core member 1 according to the present embodiment is inserted into a pile hole during construction of a cast-in-place pile. material 3; In this embodiment, a reinforcing bar cage is used as the core member 2 .

図３に示すように、芯部材（鉄筋籠）２は、芯本体４と、芯本体４に装着された複数個の取付具５と、を備え、芯本体４は、環状に並列配置された複数本の主筋４１と、複数本の主筋４１同士を連結する複数個の環状のフープ筋４２と、を備えて構成されている。本実施形態では、杭材料（ここではコンクリート）のかぶり厚を調整するためのスペーサを取付具５として用いており、この取付具５（スペーサ）は図４（ａ）に示すように、芯本体４に固定される固定部５１と、固定部５１よりも芯本体４の径方向外方に延出する延出部５２と、を備え、延出部５２には貫通孔である固定孔５２ａが設けられている。 As shown in FIG. 3, the core member (rebar cage) 2 includes a core body 4 and a plurality of fixtures 5 attached to the core body 4. The core bodies 4 are annularly arranged in parallel. It is composed of a plurality of main reinforcements 41 and a plurality of annular hoop reinforcements 42 connecting the plurality of main reinforcements 41 to each other. In this embodiment, a spacer for adjusting the cover thickness of the pile material (concrete in this case) is used as the fixture 5. As shown in FIG. 4 and an extending portion 52 extending radially outward of the core body 4 from the fixing portion 51. The extending portion 52 has a fixing hole 52a which is a through hole. is provided.

遮断材３は可撓性を有する紙製またはプラスチック製であって、プラスチック製とする場合には廃プラスチック製とするのが好ましく、図１に示すように芯部材２の長手方向に連結された複数個（複数枚）の遮断部材３０を備える。各遮断部材３０は、図５に示す複数個の貫通孔３１が設けられたシート状部材が芯部材２の外周を覆うように芯部材２に巻き付けられて筒状とされたものであり、図４に示すように貫通孔３１と固定孔５２ａに挿通された返し付きピン６によって芯部材２に固定されている。 The blocking member 3 is made of flexible paper or plastic, and if plastic is used, it is preferably made of waste plastic. A plurality of (multiple) blocking members 30 are provided. Each shielding member 30 is formed into a cylindrical shape by winding a sheet-like member provided with a plurality of through holes 31 shown in FIG. 4, it is fixed to the core member 2 by a barbed pin 6 inserted through the through hole 31 and the fixing hole 52a.

また、各遮断部材３０の上端３２及び下端３３はクランク状の段部となっており、遮断部材３０の外面３４の上端３４ａよりも内面３５の上端３５ａの方が上方に位置し、遮断部材３０の外面３４の下端３４ｂよりも内面３５の上端３５ｂの方が上方に位置するように形成されている。 Further, the upper end 32 and the lower end 33 of each blocking member 30 are crank-shaped stepped portions, and the upper end 35a of the inner surface 35 of the blocking member 30 is positioned higher than the upper end 34a of the outer surface 34 of the blocking member 30. The upper end 35b of the inner surface 35 is positioned higher than the lower end 34b of the outer surface 34 of the inner surface 35. As shown in FIG.

このような芯材１を用いた場所打ち杭の施工について説明する。なお、ここではオールケーシング工法を用いた場合を例に説明する。まず、ケーシングチューブを揺動又は回転させつつ地中に押し込み、次にケーシングチューブ内の土砂を掘削して排出する。これにより杭孔が形成される。その後、従来の芯材に代えて本実施形態の芯材１を杭孔内（ケーシングチューブ内）に建込む。このとき、芯材１全体は相当の長さ寸法となるため、芯材１を組み立てながら（順次、芯部材２に遮断部材３０を巻き付けて固定しながら）挿入していくのが好ましい。 Construction of a cast-in-place pile using such a core material 1 will be described. In addition, the case where an all-casing construction method is used is demonstrated here as an example. First, the casing tube is pushed into the ground while being rocked or rotated, and then the earth and sand inside the casing tube are excavated and discharged. This forms a pile hole. After that, the core material 1 of the present embodiment is erected in the pile hole (inside the casing tube) in place of the conventional core material. At this time, since the entire core member 1 has a considerable length, it is preferable to insert the core member 1 while assembling it (while sequentially winding and fixing the blocking member 30 around the core member 2).

即ち、芯部材２の下端部位に遮断部材３０を巻き付けてピン６を用いて固定する。これにより遮断部材３０の芯部材２に対する全方向への位置ずれが防止される。この状態で芯部材２を所定量だけ杭孔内に挿入させ、次の遮断部材３０を芯部材２に巻き付けてピン６を用いて固定する。このとき、上方に位置する遮断部材３０の下端３３を、下方に位置する遮断部材３０の上端３２に当接させて連結させ、連結部分を粘着テープ（図示せず）で仮止めしておく。このようにして仮止めしておくことで上下方向に連結された遮断部材３０同士の位置ずれを防止できる。 That is, the blocking member 30 is wound around the lower end portion of the core member 2 and fixed using the pin 6 . This prevents the blocking member 30 from being displaced in all directions with respect to the core member 2 . In this state, the core member 2 is inserted by a predetermined amount into the pile hole, and the next blocking member 30 is wound around the core member 2 and fixed using the pin 6 . At this time, the lower end 33 of the upper blocking member 30 is brought into contact with and connected to the upper end 32 of the lower blocking member 30, and the connecting portion is temporarily fixed with an adhesive tape (not shown). Temporarily fixing in this way can prevent the vertically connected shielding members 30 from being dislocated.

ここで、このようにして連結された遮断部材３０同士の連結部には、一方の遮断部材３０の上端３２と他方の遮断部材３０の下端３３とによって排水路３ａが規定される（図１、図４）。また、遮断部材３０の外面３４の上端３４ａよりも内面３５の上端３５ａの方が上方に位置していることから、排水路３ａの内側端部は外側端部よりも上方に位置する。 Here, at the connecting portion between the blocking members 30 connected in this manner, the drainage channel 3a is defined by the upper end 32 of one blocking member 30 and the lower end 33 of the other blocking member 30 (FIGS. 1 and 2). Figure 4). Since the upper end 35a of the inner surface 35 of the blocking member 30 is positioned higher than the upper end 34a of the outer surface 34 of the blocking member 30, the inner end of the drainage channel 3a is positioned higher than the outer end.

そして、所定量だけ芯部材２を杭孔内に挿入し、同様の作業を繰り返すことで、芯材１が杭孔内に設置される。なお、遮断材３（遮断部材３０）が長すぎる場合には余分な上方部位を切除すればよい。その後、杭材料（ここでは生コンクリート）を打設しながらケーシングチューブを引き抜いて回収することで一連の作業が完了し、杭材料が杭孔内で硬化して芯材１と一体化することで基礎杭が完成する。 Then, by inserting the core member 2 into the pile hole by a predetermined amount and repeating the same operation, the core member 1 is installed in the pile hole. If the blocking member 3 (blocking member 30) is too long, the excess upper portion may be cut off. After that, a series of operations is completed by pulling out and recovering the casing tube while driving the pile material (ready concrete in this case), and the pile material hardens in the pile hole and integrates with the core material 1. Foundation piles are completed.

このように、本実施形態によれば、オールケーシング工法による場所打ち杭の施工時において、ケーシングチューブを回収しても打設された杭材料（コンクリート）と掘削された地盤周面との間に遮断材３が介在することになるので、地下水や不純物等が杭材料に混入するのを防止し、杭の品質低下を防止できる。また、オールケーシング工法以外の場所打ち杭の施工時においても、打設された杭材料と掘削された地盤周面との間には遮断材３が介在することになるので、オールケーシング工法の場合と同様に杭の品質低下を防止できる。 Thus, according to the present embodiment, when constructing a cast-in-place pile by the all-casing method, even if the casing tube is recovered, there is a barrier between the pile material (concrete) that was placed and the excavated ground surface. Since the material 3 is interposed, groundwater, impurities, etc. can be prevented from being mixed into the pile material, and deterioration of the quality of the pile can be prevented. In addition, even when constructing cast-in-place piles other than the all-casing method, the shielding material 3 is interposed between the pile material that is placed and the excavated ground surface, so it is the same as in the case of the all-casing method. It is possible to prevent deterioration of pile quality.

また、遮断材３は紙製またはプラスチック製であるので、鋼製等とした場合と比較して芯材１を軽量化することができると共に製造コストを抑制でき、取り扱いも容易にできる。なお、遮断材３を紙製とした場合であっても、所定の厚み（例えば３ｃｍ程度の厚み）があれば十分な剛生を得ることができる。また、遮断材３をプラスチック製とすれば、紙製とした場合と比較して厚みを抑えることができる。 Moreover, since the shielding material 3 is made of paper or plastic, the weight of the core material 1 can be reduced compared to the case where the shielding material 3 is made of steel or the like. Even when the shielding material 3 is made of paper, it is possible to obtain a sufficient stiffness if it has a predetermined thickness (for example, a thickness of about 3 cm). Also, if the shielding material 3 is made of plastic, the thickness can be reduced compared to the case of using paper.

遮断材３の芯部材２への装着は、返し付きピン６を貫通孔３１及び固定孔５２ａに差し込むだけで行えるので作業効率がよい。また、ピン６を用いて遮断材３が芯部材２に固定されるので、完成した基礎杭の径方向中心と芯部材２の径方向中心とを一致させることができ、また杭材料の打ち込みの際に遮断材３が芯部材２に対して浮き上がるのを防止できる。遮断材３は芯部材２と共に地中に放置すれば良いので、遮断材３を回収する手間や回収した遮断材３の処理が不要となる。 Since the shielding member 3 can be attached to the core member 2 simply by inserting the barbed pin 6 into the through hole 31 and the fixing hole 52a, work efficiency is good. In addition, since the blocking member 3 is fixed to the core member 2 using the pin 6, the center of the completed foundation pile and the center of the core member 2 in the radial direction can be aligned, and the driving of the pile material can be facilitated. It is possible to prevent the shielding material 3 from floating with respect to the core member 2 at the time. Since the shielding material 3 can be left in the ground together with the core member 2, the trouble of recovering the shielding material 3 and the processing of the recovered shielding material 3 are not required.

更に、遮断材３には排水路３ａが設けられており、上述したように排水路３ａの内側端部は外側端部よりも上方に位置しているので、杭材料に含まれる余分な水分は排水路３ａを介して遮断材３の外部に排出される一方で、地盤周面から滲み出る水分等が遮断材３の内部に浸入しにくくできる。なお、隣接する一対の遮断部材３０同士は粘着テープにより仮止めされるが、このようにして仮止めされた粘着テープは内部からの水圧によって容易に剥がれ、排水路３ａを塞いで水の流れを妨げることはない。 Furthermore, the blocking material 3 is provided with a drainage channel 3a, and as described above, the inner end of the drainage channel 3a is positioned higher than the outer end, so that excess moisture contained in the pile material is removed. While the water is discharged to the outside of the shielding material 3 through the drainage channel 3a, it is possible to make it difficult for the moisture or the like that seeps out from the ground peripheral surface to enter the inside of the shielding material 3. - 特許庁A pair of adjacent shielding members 30 are temporarily attached to each other by an adhesive tape, but the adhesive tape thus temporarily attached can be easily peeled off by water pressure from the inside, blocking the drainage channel 3a and blocking the flow of water. no hindrance.

以上、本発明の実施形態に係る籠について添付の図面を参照して説明したが、本発明はかかる実施形態に限定されず、本発明の範囲を逸脱することなく種々の変形、修正が可能である。 Although the cage according to the embodiments of the present invention has been described with reference to the accompanying drawings, the present invention is not limited to such embodiments, and various modifications and alterations can be made without departing from the scope of the present invention. be.

例えば、遮断部材３０同士の仮止めの方法は粘着テープを用いる方法に限定されず、例えば、ピンやボルト、接着剤等を用いた方法であっても構わない。 For example, the method of temporarily fixing the shielding members 30 is not limited to the method using an adhesive tape, and may be a method using a pin, bolt, adhesive, or the like.

また、上記実施形態においては、遮断部材３０，３０同士の連結部に規定される排水路３ａはクランク状であるが、排水路３ａの形状はこれに限定されず、遮断材３の内側から下方外側へ向けて水分を排出できればどのような形状であっても構わない。例えば、図６に示すように遮断部材３０の上端３２及び下端３３を内側から外側に向かって斜め下方に延びる形状とすることによって、内側から外側に向かって斜め下方に直線状に延びる排水路３ａ’を規定するようにしてもよい。 In the above-described embodiment, the drainage channel 3a defined at the connecting portion between the blocking members 30, 30 has a crank shape, but the shape of the drainage channel 3a is not limited to this. Any shape may be used as long as the water can be discharged outward. For example, as shown in FIG. 6, the upper end 32 and the lower end 33 of the blocking member 30 are shaped to extend obliquely downward from the inside to the outside, so that the drainage channel 3a extends linearly obliquely downward from the inside to the outside. ' may be specified.

上記実施形態においては、図５に示すように遮断部材３０の左右方向両端面３６，３６は内面３５に対して垂直に延びることから、図２に示すように両端面３６，３６の当接部Ｊは芯部材２の径方向に沿って延びることになるが、本発明はこれに限定されず、例えば図７に示すように遮断部材３０の左右方向両端面３６，３６の当接部Ｊが横断面視クランク状の段部を構成するようにしてもよい。 In the above-described embodiment, as shown in FIG. 5, the lateral end surfaces 36, 36 of the blocking member 30 extend perpendicularly to the inner surface 35. Therefore, as shown in FIG. Although J extends along the radial direction of the core member 2, the present invention is not limited to this. For example, as shown in FIG. You may make it comprise the stepped part of a cross section view crank shape.

このように構成することによって、仮に遮断部材３０が杭材料の押圧力により径方向外方に膨らんだ場合であっても、両端面３６，３６同士の当節状態を維持することができ、杭材料の外部への露出を防止することができる。 With this configuration, even if the blocking member 30 swells radially outward due to the pressing force of the pile material, it is possible to maintain the joint state between the end faces 36, 36, and Exposure of the material to the outside can be prevented.

或いは、図８に示すように、遮断部材３０の左右方向両端面３６，３６同士をジョイント部材９を介して連結させてもよい。図８に示す例ではジョイント部材９はＨ型断面を有し、その左右方向両側に設けられた凹部に遮断部材３０の両端部が挿入されて保持されることから、遮断部材３０が径方向外方に膨らんだ場合であっても、杭材料の外部への露出を防止することができる。なお、ジョイント部材９は遮断部材３０の両端面３６，３６の上下方向全域にわたって設けられるのが好ましい。 Alternatively, as shown in FIG. 8, the left and right end surfaces 36, 36 of the blocking member 30 may be connected via a joint member 9. As shown in FIG. In the example shown in FIG. 8, the joint member 9 has an H-shaped cross section, and both ends of the blocking member 30 are inserted and held in recesses provided on both sides in the left-right direction. Even if the pile bulges in the direction, it is possible to prevent the pile material from being exposed to the outside. In addition, it is preferable that the joint member 9 is provided over the entire area of the both end surfaces 36, 36 of the blocking member 30 in the vertical direction.

上記実施形態においては、芯材１が鉄筋籠を芯部材２として備える場合について説明したが、芯材１が備える芯部材２は鉄筋籠に限定されず、例えば形鋼等、異なる形状を有するものであっても構わない。また、杭材料は硬化することによって杭を構成するもであればコンクリートに限定されず、例えばモルタル等であっても構わない。 In the above embodiment, the case where the core member 1 includes a reinforcing bar cage as the core member 2 has been described, but the core member 2 provided in the core member 1 is not limited to a reinforcing bar cage, and has a different shape such as a section steel. It doesn't matter if it is. Moreover, the pile material is not limited to concrete as long as it constitutes the pile by hardening, and may be, for example, mortar.

上記実施形態においては取付具５として図３に示すスペーサを用いたが、取付具はこれに限定されず、ピン６を用いて遮断材３を芯本体４に対して固定できるものであればどのようなものであっても構わない。例えば、芯部材２として形鋼（Ｈ形鋼等）を用いる場合には、形鋼のフランジ端部に挟み込み式の取付具を取り付け、当該取付具にピン６を用いて遮断材３を固定するようにすれば良い。またこの場合、挟み込み式の取付具に杭材料のかぶり厚を調整するためのスペーサとしての機能を持たせることもできる。更に、取付具５の個数や設置箇所は施工条件等に応じて適宜調整すれば良い。 In the above-described embodiment, the spacer shown in FIG. 3 is used as the fixture 5, but the fixture is not limited to this. It doesn't matter if it's something like For example, when a shaped steel (H-shaped steel, etc.) is used as the core member 2, a clamping fixture is attached to the flange end of the shaped steel, and the shielding material 3 is fixed to the fixture using a pin 6. You should do it like this. Further, in this case, the clamping type fixture can be provided with a function as a spacer for adjusting the covering thickness of the pile material. Furthermore, the number and installation locations of the fixtures 5 may be appropriately adjusted according to construction conditions and the like.

１ 芯材
２ 芯部材
３ 遮断材
３ａ 排水路
４ 芯本体
５ 取付具
６ ピン
３０ 遮断部材

Reference Signs List 1 Core material 2 Core member 3 Blocking material 3a Drainage channel 4 Core body 5 Fixture 6 Pin 30 Blocking member

Claims (4)

場所打ち杭の施工時に杭孔に挿入される芯部材の外周を覆う遮断材であって、
筒状の第１遮断部材と、前記第１遮断部材に連結された筒状の第２遮断部材と、を備え、
前記第１遮断部材の上端は前記第２遮断部材の下端と当接し、
第１遮断部材の上端と前記第２遮断部材の下端とによって排水路が規定され、
前記第１遮断材の径方向を基準として、前記排水路の内側端部は外側端部よりも上方に
位置し、
前記芯部材に固定された状態で前記芯部材と共に前記杭孔に挿入される遮断材。 A blocking material that covers the outer periphery of a core member that is inserted into a pile hole during construction of a cast-in-place pile,
A tubular first blocking member and a tubular second blocking member connected to the first blocking member,
the upper end of the first blocking member abuts the lower end of the second blocking member;
A drainage channel is defined by the upper end of the first blocking member and the lower end of the second blocking member,
With respect to the radial direction of the first blocking material, the inner end of the drainage channel is positioned above the outer end.
Position to,
A blocking member that is inserted into the pile hole together with the core member while being fixed to the core member. 場所打ち杭の施工時に杭孔に挿入される芯部材と、
前記芯部材に固定されて前記芯部材の外周を覆う遮断材と、を備え、
前記遮断材は請求項１に記載の遮断材である芯材。 A core member to be inserted into the pile hole during construction of the cast-in-place pile;
a blocking material fixed to the core member and covering the outer periphery of the core member;
The said shielding material is the core material which is the shielding material of Claim 1 . 前記芯部材は、芯本体と、前記芯本体に装着された取付具と、を備え、
前記取付具には固定孔が設けられ、
前記遮断材には挿通孔が設けられ、
前記遮断材は、前記挿通孔及び前記固定孔に挿通された返し付きピンにより前記取付具に固定されている請求項２に記載の芯材。 The core member includes a core body and a fixture attached to the core body,
The fixture is provided with a fixing hole,
The blocking member is provided with an insertion hole,
3. The core material according to claim 2 , wherein the shielding material is fixed to the fixture by a barbed pin inserted through the insertion hole and the fixing hole. 場所打ち杭の施工方法であって、
抗孔を掘削する工程と、
前記杭孔に芯材を挿入する工程と、
前記杭孔に杭材料を打設する工程と、を含み、
前記芯材は、芯部材と、前記芯部材の周面を覆う遮断材と、を有し、
前記遮断材は前記芯部材と共に杭孔内に放置され、
前記芯材は請求項２又は３に記載の芯材である場所打ち杭の施工方法。
A cast-in-place pile construction method,
drilling a borehole;
inserting a core material into the pile hole;
driving a pile material into the pile hole;
The core member has a core member and a shielding material covering the peripheral surface of the core member,
The shielding material is left in the pile hole together with the core member ,
A construction method for a cast-in-place pile, wherein the core material is the core material according to claim 2 or 3 .
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