JP2015063790A - Construction method of foundation structure for building - Google Patents

Construction method of foundation structure for building Download PDF

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JP2015063790A
JP2015063790A JP2013196383A JP2013196383A JP2015063790A JP 2015063790 A JP2015063790 A JP 2015063790A JP 2013196383 A JP2013196383 A JP 2013196383A JP 2013196383 A JP2013196383 A JP 2013196383A JP 2015063790 A JP2015063790 A JP 2015063790A
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foundation
opening
connecting portion
construction method
joining
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JP6332931B2 (en
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淳志 川崎
Atsushi Kawasaki
淳志 川崎
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Misawa Homes Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To enable connection strength of PC foundations with each other to be easily increased without causing a cost increase in a construction method of a foundation structure for a building.SOLUTION: PC foundations 10 each having a connection part 11 of a U shape in a plan-view with an end part in a longitudinal direction becoming an opening 11a toward the outside are sequentially arranged. In the opening 11a of the connection part 11, a joint bar 3 is arranged which consists of a pair of horizontal reinforcements 31, 31 arranged at upper and lower positions vertically separated from each other and horizontally extending and a vertical reinforcement 32 vertically connecting the horizontal reinforcements 31, 31 to each other. Penetration means 33 penetrating in the depthwise direction of the connection part 11 is disposed at least on an upper side between the pair of horizontal reinforcements 31, 31 and between both ends in the horizontal direction thereof in the joint bar 3 arranged in the opening 11a of the connection part 11. Concrete is placed in the opening 11a of the connection part 11 to connect the adjacent PC foundations 10, 10 with each other.

Description

本発明は、建物用基礎の施工方法に関する。   The present invention relates to a building foundation construction method.

近年、この種の建物用の布基礎は、建物の構築領域の地盤を連続的に掘削して形成された根切り部に、予め工場等でブロック状に成形されたプレキャストコンクリート製の基礎部材(以下、これをPC基礎と称す)を順次配列することにより造られている(例えば、特許文献1参照)。   In recent years, fabric foundations for this type of building have been pre-cast concrete foundation members that have been pre-formed into blocks in a factory or the like in the root cutting part formed by continuously excavating the ground in the building construction area ( In the following, this is referred to as “PC foundation” (see, for example, Patent Document 1).

かかる特許文献1のPC基礎は、両端部が平面コ字形状の開口を有する連結部とされた形状をなしており、その本体部分を形成する第1部材と、この第1部材に接合されて連結部を形成する第2部材とで構成されている。この第2部材は平板形状に成形されており、第1部材の端部付近に厚み方向に突設された突部を介してボルト締結されることにより、PC基礎の端部に平面コ字形状の開口を有する連結部を形成するようになっている。そして、一対のPC基礎を、その連結部同士を突き合わせるように配列し、これら連結部間にコンクリートを打設して結合させることで布基礎を構築している。   The PC foundation of Patent Document 1 has a shape in which both end portions are connected portions having planar U-shaped openings, and is joined to the first member forming the main body portion and the first member. It is comprised with the 2nd member which forms a connection part. This second member is formed into a flat plate shape, and is bolted through a protrusion projecting in the thickness direction near the end of the first member, so that the end of the PC foundation has a flat U shape. The connection part which has this opening is formed. And a cloth foundation is constructed by arranging a pair of PC foundations so that the connecting parts abut each other, and placing and connecting concrete between these connecting parts.

特許第3784140号公報Japanese Patent No. 3784140

ところで、特許文献1では、PC基礎同士が連結部(すなわち、端部の開口)を対向させて配列されており、当該配列した際に開口同士を突き合わせて形成される空間内に、接合用の配筋材(以下、これを接合筋と称する)を配置してからコンクリートスラリーが打設されて連結されていた。このとき、かかるPC基礎は、第1部材と第2部材とがボルトやナット等の締結部材によってボルト締結されることから、当該締結部材が前記空間内に後から配置される接合筋と干渉する虞があった。そのため、開口側でのボルト締結位置をPC基礎の下面寄りに設定していた。   By the way, in patent document 1, PC foundations are arranged with the connecting portions (that is, openings at the end portions) facing each other, and in the space formed by abutting the openings when the arrangement is made, After placing a reinforcing bar (hereinafter referred to as a joining bar), a concrete slurry was placed and connected. At this time, in the PC foundation, since the first member and the second member are bolt-fastened by a fastening member such as a bolt or a nut, the fastening member interferes with a joining bar disposed later in the space. There was a fear. Therefore, the bolt fastening position on the opening side is set closer to the lower surface of the PC foundation.

しかしながら、ボルト締結位置を下面側に設定したとしても、第1部材および第2部材間には依然として締結部材が設置されているため、PC基礎の上方から接合筋を挿入する際、その接合筋の形状によっては締結部材と干渉する虞がある。すなわち、第1部材および第2部材間に締結部材が設置されている場合、接合筋は前記締結部材を避けた形状しか採用できない。   However, even if the bolt fastening position is set on the lower surface side, since the fastening member is still installed between the first member and the second member, when inserting the joining bar from above the PC foundation, Depending on the shape, there is a risk of interference with the fastening member. That is, when the fastening member is installed between the first member and the second member, the joining bar can adopt only a shape avoiding the fastening member.

このため、例えばPC基礎同士の連結強度を強化したり、挿入された接合筋がPC基礎の上方から抜け出したりしないように防止すべく、接合筋の上下端部に各々水平方向に延在する一対の横材を有するような形状の採用が望まれていても、ボルト締結後では当該横材と締結部材が干渉するため使用できない。
また、ボルト締結前に接合筋を配置しておくことも考えられるが、構築する基礎の全体に亘って予め連結部に接合筋を配置してからボルト締結するようにした場合、PC基礎同士の連結作業が非常に煩雑になることは明かである。
For this reason, for example, in order to reinforce the connection strength between the PC foundations or prevent the inserted joining bars from slipping out from above the PC foundation, a pair extending horizontally at the upper and lower ends of the joining bars. Even if it is desired to adopt a shape having a cross member of this type, it cannot be used after the bolt is fastened because the cross member and the fastening member interfere with each other.
In addition, it is conceivable to arrange the joining bars before fastening the bolts. However, if the joining bars are arranged in advance at the connecting portion over the entire foundation to be constructed, It is clear that the connecting work becomes very complicated.

このように、特許文献1の基礎構造では、PC基礎の連結部に対して連結強度の強化を図る接合筋を配置することが困難であり、当該接合筋の配設作業が煩雑な問題が解消されていない。
また、このPC基礎は第1部材と第2部材とが別体で構成され、ボルト締結によって接合されていることから、一体成形される場合と比較して部品点数が多い分、コスト増を免れない点が懸念されている。
As described above, in the basic structure of Patent Document 1, it is difficult to arrange the joining bars for strengthening the connection strength with respect to the connecting portion of the PC foundation, and the problem of complicated arrangement of the joining bars is solved. It has not been.
In addition, since this PC foundation is composed of the first member and the second member separately and joined by bolt fastening, the number of parts is increased compared to the case of integral molding, thus avoiding an increase in cost. There are concerns that there is no point.

そこで、本発明は上述した事情に鑑みてなされたもので、予め工場等で成形されたPC基礎を順次配列して構築される建物用基礎の施工方法において、コスト増を招くことなく、PC基礎同士の連結強度を容易に強化できるようにすることを目的とする。   Accordingly, the present invention has been made in view of the above-described circumstances, and in a construction method for building foundations constructed by sequentially arranging PC foundations that have been molded in advance in a factory or the like, the PC foundations do not cause an increase in cost. It aims at making it possible to easily strengthen the connection strength between each other.

上記課題を解決するために、請求項1に記載の発明は、例えば図1〜図22に示すように、建物の構築領域で地盤100を連続的に掘削して根切り部20を形成し、この根切り部20に長手方向の端部が連結部11とされたプレキャストコンクリート製の建物用基礎部材(例えば、PC基礎10(12,14))を順次配列し、これら隣接する建物用基礎部材(PC基礎10,10)同士を接合用の配筋材(接合筋3)によって連結する建物用基礎(布基礎1)の施工方法において、
前記連結部11は、前記建物用基礎部材(PC基礎10(12,14))の長手方向の外方に向けた開口11aを有することによって平面コ字形状に成形されてなり、
前記接続用の配筋材3は、
前記連結部11の開口11a内における垂直方向の上下に離間した位置に配置され、各々水平方向に延在する一対の横配筋31,31と、
これら一対の横配筋31,31間に配置され、当該横配筋31,31同士を垂直方向に連結する縦配筋32と、を有しており、
前記順次配列された建物用基礎部材(PC基礎10(12,14))の前記連結部11の開口11a内に前記接合用の配筋材3を配置し、
前記連結部11の開口11a内に配置された前記接合用の配筋材3のうち、少なくとも前記一対の横配筋31,31間における上方側であって、当該上方側の横配筋31における前記水平方向の両端部間の位置に、前記開口11aを含む平面コ字形状の連結部11に対して当該連結部11の厚み方向に貫通する貫通手段33(ボルト33a、貫通孔34、穴35および不図示のナット等を含む)を配設して、
前記接合用の配筋材3が配置された前記連結部11の開口11a内にコンクリート4を打設することを特徴とする。
In order to solve the above-mentioned problem, the invention according to claim 1, for example, as shown in FIGS. 1 to 22, the ground 100 is continuously excavated in the building construction area to form the root cutting part 20. Building base members made of precast concrete (for example, PC foundations 10 (12, 14)) whose end portions in the longitudinal direction are connected to the root cutting portion 20 are sequentially arranged, and these adjacent building foundation members are arranged. In the construction method of the building foundation (fabric foundation 1) in which the (PC foundations 10, 10) are joined together by the reinforcing bar material for joining (joint reinforcement 3),
The connecting portion 11 is formed into a plane U shape by having an opening 11a facing outward in the longitudinal direction of the building foundation member (PC foundation 10 (12, 14)),
The connecting reinforcing material 3 is
A pair of lateral reinforcing bars 31, 31 that are disposed at positions vertically spaced in the opening 11 a of the connecting portion 11 and extend in the horizontal direction;
A vertical bar 32 that is disposed between the pair of horizontal bars 31 and 31 and connects the horizontal bars 31 and 31 in the vertical direction;
The bar arrangement material 3 for joining is arranged in the opening 11a of the connecting portion 11 of the building foundation member (PC foundation 10 (12, 14)) sequentially arranged,
Among the joint reinforcing bars 3 arranged in the opening 11 a of the connecting portion 11, at least the upper side between the pair of horizontal reinforcing bars 31, 31, and in the upper horizontal reinforcing bar 31. Penetration means 33 (bolts 33a, through-holes 34, holes 35) penetrating in the thickness direction of the connecting portion 11 with respect to the connecting portion 11 having a planar U-shape including the opening 11a at a position between both ends in the horizontal direction. And a nut (not shown))
Concrete 4 is placed in the opening 11a of the connecting portion 11 in which the reinforcing bar material 3 for bonding is disposed.

請求項1に記載の発明によれば、建物用基礎部材(PC基礎10(12,14))の連結部11に配設される接合筋3が、連結部11の開口11a内における垂直方向の上下に離間した位置に配置され、各々水平方向に延在する一対の横配筋31,31と、これら一対の横配筋31,31間に配置され、当該横配筋31,31同士を垂直方向に連結する縦配筋32と、を有している。また、建物用基礎部材(PC基礎10(12,14))は、連結部11に接合筋3を配置した後、当該接合筋3のうち、少なくとも一対の横配筋31,31間における上方側であって、当該上方側の横配筋31における水平方向の両端部間の位置に、開口11aを含む平面コ字形状の連結部11に対して当該連結部11の厚み方向に貫通する貫通手段33を配設するようにした。従って、連結部11に接合筋3を配置してから当該連結部11に貫通手段33を配設することができるため、建物用基礎部材(PC基礎10(12,14))の連結部11に対して連結強度の強化を図る接合筋3を配置することが容易となる。
このとき、連結部11は当該建物用基礎部材(PC基礎10(12,14))の長手方向の外方に向けた開口11aを有することによって平面コ字形状に成形されている。つまり、連結部11は従来と比して開口11aが平面コ字形状に一体で成形されている。従って、連結部11が第1部材と第2部材とをボルト締結するように別体成形された従来品と比較して部品点数を低減でき、コストを抑えることができる。しかも、一体成形されている分、ボルト締結するための作業工数も削減できる。
また、建物用基礎部材(PC基礎10(12,14))は開口を含む平面コ字形状の連結部11に対し、当該連結部11の厚み方向に貫通される貫通手段33を備えているので、連結部11の開口11a内にコンクリート4を打設することによって、当該開口11aの厚み方向に生じる剪断応力に対して効果的な補強を図ることができる。
かくして、請求項1に記載の発明では、コスト増を招くことなく、建物用基礎部材(PC基礎10,10)同士の連結強度を容易に強化できる。
According to the first aspect of the present invention, the joining bars 3 arranged in the connecting portion 11 of the building foundation member (PC foundation 10 (12, 14)) are arranged in the vertical direction in the opening 11a of the connecting portion 11. It arrange | positions in the position spaced apart up and down, and is arrange | positioned between a pair of horizontal reinforcing bars 31 and 31 each extending in the horizontal direction, and these horizontal reinforcing bars 31 and 31 are perpendicular | vertical. And longitudinal bars 32 connected in the direction. In addition, the building foundation member (PC foundation 10 (12, 14)) is arranged on the upper side between at least a pair of lateral reinforcement bars 31, 31 of the joint bars 3 after the joint bars 3 are arranged in the connecting portion 11. And the penetration means which penetrates in the thickness direction of the said connection part 11 with respect to the planar U-shaped connection part 11 containing the opening 11a in the position between the both ends of the horizontal direction in the said horizontal reinforcement 31 33 is arranged. Therefore, since the penetration means 33 can be arrange | positioned in the said connection part 11 after arrange | positioning the joining bar | burr 3 in the connection part 11, in the connection part 11 of the foundation member for buildings (PC foundation 10 (12, 14)). On the other hand, it becomes easy to arrange the joining bars 3 for enhancing the connection strength.
At this time, the connection part 11 is shape | molded by the planar U shape by having the opening 11a toward the outward of the longitudinal direction of the said foundation member for buildings (PC foundation 10 (12, 14)). That is, the connecting part 11 has an opening 11a integrally formed in a U-shaped plane as compared with the conventional case. Accordingly, the number of parts can be reduced and the cost can be reduced as compared with a conventional product in which the connecting portion 11 is separately molded so that the first member and the second member are bolted together. In addition, the number of work steps for fastening the bolts can be reduced by the integral molding.
Further, the building foundation member (PC foundation 10 (12, 14)) is provided with penetrating means 33 penetrating in the thickness direction of the connecting portion 11 with respect to the connecting portion 11 having a square U shape including the opening. By placing the concrete 4 in the opening 11a of the connecting portion 11, it is possible to effectively reinforce the shear stress generated in the thickness direction of the opening 11a.
Thus, according to the first aspect of the present invention, the connection strength between the building foundation members (PC foundations 10 and 10) can be easily enhanced without increasing the cost.

請求項2に記載の発明は、請求項1に記載の建物用基礎(布基礎1)の施工方法において、
前記接合用の配筋材3は、少なくとも前記上方側の横配筋31における前記連結部11の開口11a内に位置する端部が、前記縦配筋32側に向けて曲折されてなる引掛部31aとされており、
前記連結部11に前記貫通手段33(例えば、ボルト33a)を配設する際、前記引掛部31a近傍に配設することを特徴とする。
Invention of Claim 2 is the construction method of the foundation for buildings (fabric foundation 1) of Claim 1,
The joining bar arrangement material 3 is a hooking portion in which at least an end portion of the upper side bar arrangement 31 located in the opening 11a of the connecting portion 11 is bent toward the vertical bar arrangement 32 side. 31a,
When the penetrating means 33 (for example, a bolt 33a) is disposed in the connecting portion 11, it is disposed in the vicinity of the hooking portion 31a.

請求項2に記載の発明によれば、接合筋3は、少なくとも連結部11の開口11a内に位置する上方側の横配筋31における端部が、縦配筋32側に向けて曲折されてなる引掛部31aとされている。そして、連結部11に貫通手段33を配設する際、当該貫通手段33(ボルト33a)を引掛部31a近傍に配設するようにした。よって、連結部11の開口11a内に配置された接合筋3が、この開口11a内から抜け出ようとしても、当該貫通手段33(ボルト33a)が引掛部31aに引っ掛かったり、上下一対の横配筋31,31に当接したりすることで、当該開口11a内から抜け出ることを未然に防止できる。   According to the invention described in claim 2, the joining bar 3 is formed such that at least an end portion of the upper horizontal bar 31 located in the opening 11 a of the connecting part 11 is bent toward the vertical bar 32. It becomes the hook part 31a which becomes. When the penetrating means 33 is disposed in the connecting portion 11, the penetrating means 33 (bolt 33a) is disposed in the vicinity of the hooking portion 31a. Therefore, even if the joining bar 3 arranged in the opening 11a of the connecting part 11 tries to come out of the opening 11a, the penetrating means 33 (bolt 33a) is caught by the hooking part 31a, or a pair of upper and lower horizontal bars. By coming into contact with 31, 31, it can be prevented from coming out of the opening 11a.

請求項3に記載の発明は、請求項1または2に記載の建物用基礎(布基礎1)の施工方法において、
前記連結部11に前記貫通手段33(ボルト33a)を配設する際、前記連結部11に配置された前記接合用の配筋材3のうち、前記一対の横配筋31,31間における上方側および下方側の各横配筋31における前記水平方向の両端部間にそれぞれ配設することを特徴とする。
Invention of Claim 3 is the construction method of the foundation for buildings (cloth foundation 1) of Claim 1 or 2,
When the penetrating means 33 (bolt 33a) is disposed in the connecting portion 11, the upper portion between the pair of lateral reinforcing bars 31 and 31 among the connecting reinforcing bars 3 arranged in the connecting portion 11 It arrange | positions between the both ends of the said horizontal direction in each horizontal reinforcement 31 of a side and a downward side, It is characterized by the above-mentioned.

請求項3に記載の発明によれば、連結部11に貫通手段33(ボルト33a)を配設する際、当該貫通手段33(ボルト33a)を、連結部11に配置された接合筋3のうち、一対の横配筋31,31間における上方側および下方側の各横配筋31における水平方向の両端部間にそれぞれ配設するので、連結部11の開口11a内に配置された接合筋3が、この開口11a内から抜け出ようとしても、当該開口11a内の上下に一対で設けられた横配筋31,31と貫通手段33(ボルト33a)とが当接することで、当該開口11a内から抜け出ることを確実に防止できる。   According to the invention described in claim 3, when the penetrating means 33 (bolt 33 a) is disposed in the connecting portion 11, the penetrating means 33 (bolt 33 a) is connected to the joining bar 3 disposed in the connecting portion 11. Since the upper and lower horizontal reinforcing bars 31 between the pair of horizontal reinforcing bars 31 and 31 are disposed between both ends in the horizontal direction, the joining bars 3 disposed in the opening 11a of the connecting part 11 are disposed. However, even if it is about to come out from the opening 11a, the horizontal reinforcing bars 31, 31 provided in pairs above and below the opening 11a and the penetrating means 33 (bolts 33a) come into contact with each other, so that the opening 11a It can be surely prevented from coming out.

請求項4に記載の発明は、請求項3に記載の建物用基礎(布基礎1)の施工方法において、
前記接合用の配筋材3は、前記上方側および下方側の横配筋31,31における前記連結部11の開口11a内に位置する端部が、それぞれ前記縦配筋32側に向けて曲折されてなる引掛部31aとされており、
前記連結部11に前記貫通手段33(ボルト33a)を配設する際、前記上方側および下方側の各引掛部31a近傍にそれぞれ配設することを特徴とする。
Invention of Claim 4 is the construction method of the foundation for buildings (cloth foundation 1) of Claim 3,
In the bar arrangement material 3 for joining, the end portions located in the opening 11a of the connecting portion 11 in the upper and lower lateral bar arrangements 31 and 31 are bent toward the vertical reinforcement 32 side, respectively. The hook portion 31a is made of,
When the penetrating means 33 (bolt 33a) is disposed in the connecting portion 11, it is disposed in the vicinity of the upper and lower hooking portions 31a.

請求項4に記載の発明によれば、接合筋3は、連結部11の開口11a内に位置する上方側および下方側の横配筋31,31における端部が、それぞれ縦配筋32側に向けて曲折されてなる引掛部31aとされており、連結部11に貫通手段33(ボルト33a)を配設する際、当該貫通手段33(ボルト33a)を、上方側および下方側の各引掛部31a近傍にそれぞれ配設するので、連結部11の開口11a内に配置された接合筋3が、この開口11a内から抜け出ようとしても、上方側および下方側の各引掛部31aに貫通手段33(ボルト33a)が引っ掛かることで、当該開口11a内から抜け出ることをより確実に防止できる。しかも、このとき、貫通手段33(ボルト33a)と各引掛部31aとがより近接した位置関係であれば、連結部11の開口11a内において接合筋3が動いたり、位置がずれたりすることも防止できる。よって、接合筋3を連結部11の開口11a内に最適な状態で配設することができ、当該接合筋3による建物用基礎部材(PC基礎10,10)同士の連結強度を最大限に発揮させることができる。   According to the invention described in claim 4, the joining bar 3 has the upper and lower lateral bars 31, 31 located in the opening 11 a of the connecting part 11, with the end bars on the vertical bar 32 side. When the penetrating means 33 (bolt 33a) is disposed in the connecting portion 11, the penetrating means 33 (bolt 33a) is connected to each of the upper and lower hooking portions. Since the connecting bars 3 arranged in the opening 11a of the connecting portion 11 try to come out from the opening 11a, the penetrating means 33 ( The bolt 33a) can be more reliably prevented from coming out of the opening 11a by being caught. In addition, at this time, if the penetrating means 33 (bolt 33a) and each hooking portion 31a are closer to each other, the joining bar 3 may move or be displaced in the opening 11a of the connecting portion 11. Can be prevented. Therefore, the joining bar 3 can be optimally arranged in the opening 11a of the connecting portion 11, and the connecting strength between the building foundation members (PC foundations 10, 10) by the joining bar 3 is maximized. Can be made.

請求項5に記載の発明は、請求項1〜4のいずれか一項に記載の建物用基礎(布基礎1)の施工方法において、
前記連結部11の開口11a内に配置された前記接合用の配筋材3の一方の端部に対して反対側となる他方の端部が、当該連結部11に隣接する他の建物用基礎部材(PC基礎14)に埋設されていることを特徴とする。
Invention of Claim 5 is the construction method of the foundation for buildings (cloth foundation 1) as described in any one of Claims 1-4,
Another building foundation in which the other end opposite to one end of the joining reinforcing bar 3 arranged in the opening 11 a of the connecting portion 11 is adjacent to the connecting portion 11. It is embedded in the member (PC foundation 14).

請求項5に記載の発明によれば、連結部11の開口11a内に配置された接合筋3の一方の端部に対して反対側となる他方の端部が、当該連結部11に隣接する他の建物用基礎部材(PC基礎14)に埋設されている。すなわち、接合筋3の他方の端部が埋設された他の建物用基礎部材(PC基礎14)から当該接合筋3の一方の端部が突出している。この場合、他の建物用基礎部材(PC基礎14)から突出している接合筋3の一方の端部が、連結部11の開口11a内に位置するように建物用基礎部材(PC基礎12)を配置して接合することにより、これら建物用基礎部材(PC基礎12,14)同士の連結強度を確実に強化できる。また、この場合、接合筋3の他方の端部が他の建物用基礎部材(PC基礎14)に埋設されるので、当該接合筋3における縦配筋32は設けなくても良い。   According to the fifth aspect of the present invention, the other end that is opposite to one end of the joint 3 disposed in the opening 11 a of the connecting portion 11 is adjacent to the connecting portion 11. It is buried in another building foundation member (PC foundation 14). That is, one end portion of the joining bar 3 protrudes from another building foundation member (PC foundation 14) in which the other end portion of the joining bar 3 is embedded. In this case, the building foundation member (PC foundation 12) is placed so that one end of the joint 3 protruding from the other building foundation member (PC foundation 14) is located in the opening 11a of the connecting portion 11. By arranging and joining, the connection strength between these building foundation members (PC foundations 12 and 14) can be surely strengthened. In this case, since the other end of the joining bar 3 is embedded in another building foundation member (PC foundation 14), the vertical bar 32 in the joining bar 3 may not be provided.

請求項6に記載の発明は、請求項1〜5のいずれか一項に記載の建物用基礎(布基礎1)の施工方法において、
前記縦配筋32が、前記一対の横配筋31,31間の前記水平方向における所定の離間した位置に一対で配置されており、
前記連結部11に前記貫通手段33(ボルト33a)を配設する際、少なくとも前記一対の縦配筋32,32間に配設することを特徴とする。
Invention of Claim 6 is the construction method of the foundation for buildings (cloth foundation 1) as described in any one of Claims 1-5,
The vertical reinforcing bars 32 are arranged in a pair at a predetermined spaced position in the horizontal direction between the pair of horizontal reinforcing bars 31, 31;
When the penetrating means 33 (bolt 33a) is disposed in the connecting portion 11, it is disposed at least between the pair of vertical reinforcing bars 32, 32.

請求項6に記載の発明によれば、接合筋3における縦配筋32が、一対の横配筋31,31間の水平方向における所定の離間した位置に一対で配置されており、連結部11に貫通手段33(ボルト33a)を配設する際、当該貫通手段33(ボルト33a)を、少なくとも一対の縦配筋32,32間に配設するので、連結部11の開口11a内において、接合筋3が水平方向に移動することも抑制できる。   According to the sixth aspect of the present invention, the vertical reinforcing bars 32 in the joining bars 3 are arranged in a pair at a predetermined distance in the horizontal direction between the pair of horizontal reinforcing bars 31, 31, and the connecting portion 11. When the penetrating means 33 (bolt 33a) is disposed in the shaft, the penetrating means 33 (bolt 33a) is disposed between at least the pair of longitudinal reinforcing bars 32, 32. It is also possible to suppress the movement of the muscle 3 in the horizontal direction.

本発明によれば、予め工場等で成形されたプレキャストコンクリート製の基礎部材を順次配列して構築される建物用基礎の施工方法において、コスト増を招くことなく、基礎部材同士の連結強度を容易に強化できる。   According to the present invention, in a building foundation construction method constructed by sequentially arranging precast concrete foundation members molded in advance in a factory or the like, the connection strength between the foundation members can be easily achieved without incurring an increase in cost. Can be strengthened.

本発明の一実施例に係る建物用基礎構造の全体斜視図である。It is a whole perspective view of the foundation structure for buildings concerning one example of the present invention. 両端部に連結部が形成された建物用基礎部材を示し、(a)はその平面図、(b)はその正面図である。The foundation member for buildings in which the connection part was formed in the both ends is shown, (a) is the top view, and (b) is the front view. 図2(a)におけるA−A線断面を示す斜視図である。It is a perspective view which shows the AA line cross section in Fig.2 (a). 図2(a)におけるB−B線断面図である。It is the BB sectional view taken on the line in Fig.2 (a). 一方の端部に突出部が形成され、他方の端部に連結部が形成された建物用基礎部材を示し、(a)はその平面図、(b)はその正面図である。The building basic member in which the protrusion part was formed in one edge part and the connection part was formed in the other edge part is shown, (a) is the top view, (b) is the front view. 建物用基礎部材の連結部を示し、(a)はその要部を示す平面図、(b)はそのA−A線断面を示す断面図である。The connection part of the foundation member for buildings is shown, (a) is a top view which shows the principal part, (b) is sectional drawing which shows the AA line cross section. 建物用基礎部材同士の連結における接合態様を種類別に示す表である。It is a table | surface which shows the joining aspect in the connection of the foundation members for buildings according to a kind. 建物用基礎構造における他の接合態様を示し、(a)はその基礎配置図、(b)はそれに対応する間取り図である。The other joining aspect in the foundation structure for buildings is shown, (a) is the basic layout, (b) is a floor plan corresponding to it. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供し、立上り部の変形例を示す断面図である。It is used for description of the construction method of the foundation for buildings, and is sectional drawing which shows the modification of a rising part. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings. 建物用基礎の施工方法の説明に供する説明図である。It is explanatory drawing with which it uses for description of the construction method of the foundation for buildings.

以下、本発明の一実施形態について、図面を参照しながら詳細に説明する。
本発明に係る建物用基礎の施工方法を用いた、本実施形態の建物用基礎である布基礎1は、図1に示すように、根切り部20にPC基礎10が順次配列されることによって構築される。このとき、根切り部20は、建物の構築領域で地盤100を連続的に掘削(布掘り)して形成されており、この根切り部20のコーナー部および所定位置には、ベース部30が設置されている。そして、これらベース部30,30間にPC基礎10が架設されることによって、布基礎1が構築されている。
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the fabric foundation 1 that is the building foundation of the present embodiment using the building foundation construction method according to the present invention is arranged by sequentially arranging the PC foundations 10 in the root cutting part 20. Built. At this time, the root cutting part 20 is formed by continuously excavating (clothing) the ground 100 in the building construction area, and the base part 30 is provided at a corner portion and a predetermined position of the root cutting part 20. is set up. The fabric foundation 1 is constructed by laying the PC foundation 10 between the base portions 30 and 30.

このベース部30は、根切り部20に載置される敷きモルタル21と、当該敷きモルタル21上に敷設されるプレキャストコンクリート製の底盤22(以下、これをPC底盤22と称す)とを有している。このPC底盤22はレベルプレートとも呼ばれ、補強鉄筋(図示せず)を内部に有して強化されたコンクリート板であるため、建築現場で補強鉄筋をこのベース部30上に配設する作業を省略できる。また、このPC底盤22は、上面が滑らかな平面となっており、PC基礎10を架設するときにこの上面に位置合わせのための墨出しを行えるようになっている。   The base portion 30 includes a mortar 21 placed on the root cutting portion 20 and a base plate 22 made of precast concrete (hereinafter referred to as a PC bottom plate 22) laid on the mortar 21. ing. The PC bottom plate 22 is also called a level plate, and is a concrete plate reinforced with reinforcing reinforcing bars (not shown) inside. Therefore, the work of arranging the reinforcing reinforcing bars on the base portion 30 at the construction site is performed. Can be omitted. Further, the PC bottom plate 22 has a smooth upper surface, and when the PC foundation 10 is installed, it is possible to mark the upper surface for alignment.

また、このベース部30を根切り部20に設置するときには、このベース部30の設置位置に敷きモルタル21の山を載置し、この敷きモルタル21の山を潰すようにしてPC底盤22を載置する。そして、このPC底盤22を掛矢等で叩いて所定の高さで上面がほぼ水平になるよう調整作業を行なう。なお、この作業は、水糸や水準器やレーザー光線による水準装置等を用いて水平レベルおよび高さを確認しながら行なう。   Further, when installing the base portion 30 on the root cutting portion 20, the pile of the mortar 21 is placed on the installation position of the base portion 30, and the PC bottom plate 22 is placed so as to crush the pile of the spread mortar 21. Put. Then, the PC bottom board 22 is hit with a hanging arrow or the like, and adjustment work is performed so that the upper surface becomes substantially horizontal at a predetermined height. This operation is performed while checking the horizontal level and height using a water thread, a level, a level device using a laser beam, or the like.

次に、こうして設置されたベース部30,30間に架設されるPC基礎10について説明する。図1に示すように、PC基礎10は、予め工場においてブロック状に成形されたプレキャストコンクリート製の基礎部材である。このPC基礎10には、大別すると、長手方向の両端部に連結部11が形成されたPC基礎12(図1中右側)と、一方の端部には連結部11が形成され、他方の端部には側方に向けて突出した矩形状の突出部13が形成されたPC基礎14(図1中左側)との二種類がある。このPC基礎14は、主に建物の隅部に配置される。   Next, the PC foundation 10 constructed between the base portions 30 and 30 thus installed will be described. As shown in FIG. 1, the PC foundation 10 is a foundation member made of precast concrete that has been previously formed into a block shape in a factory. The PC foundation 10 is roughly divided into a PC foundation 12 (right side in FIG. 1) in which connecting portions 11 are formed at both ends in the longitudinal direction, and a connecting portion 11 is formed at one end, There are two types of PC base 14 (left side in FIG. 1) in which a rectangular protruding portion 13 protruding toward the side is formed at the end. This PC foundation 14 is mainly arranged at the corner of a building.

図2は、両端部に連結部11が形成されたPC基礎12を示し、(a)はその平面図、(b)はその正面図である。そして、図3は、図2(a)におけるA−A線断面の斜視図である。これらの図において、PC基礎12は、立上り部16とフーチング部18とを有している。   FIGS. 2A and 2B show a PC base 12 in which connecting portions 11 are formed at both ends, where FIG. 2A is a plan view and FIG. 2B is a front view thereof. FIG. 3 is a perspective view of a cross section taken along line AA in FIG. In these drawings, the PC foundation 12 has a rising portion 16 and a footing portion 18.

立上り部16は、上端面に建物を載置して支持するもので、内部に図示しない補強用の鉄筋が埋設されてコンクリートによって所定の厚さで直方体状に形成されている。このように形成されていることから、図1に示すように、ベース部30、30間に架設すると、この立上り部16は、根切り部20の地盤100から所定間隔をあけて所定空間を形成した状態で設置されることとなる。   The rising portion 16 is configured to place and support a building on the upper end surface, and a reinforcing bar (not shown) is embedded therein and is formed in a rectangular parallelepiped shape with a predetermined thickness by concrete. Since it is formed in this way, as shown in FIG. 1, when it is installed between the base parts 30 and 30, the rising part 16 forms a predetermined space with a predetermined interval from the ground 100 of the root cutting part 20. It will be installed in the state.

また、立上り部16の両端部に形成されている連結部11は、肉厚が厚くなって、長手方向の外方に向けた開口11aを有することにより平面コ字形状に成形されてなる。かかるPC基礎12,12同士を直線状に接合するときには、それぞれの連結部11,11を対向させて設置する。このとき、これら連結部11,11を突き合わせることによって形成される開口11a,11aの空間内には、接合用の配筋材(以下、これを接合筋と称す)が上方から挿入配置される。これにより、連結部11,11間における連結強度の強化を図るようになっている。そして、その後、現場打ちコンクリート4(後述の図20,21等参照)が打設され、このコンクリート4の養生によって、隣接するPC基礎12,12同士を強固に連結するようになっている。なお、ここでは不図示であるが、接合筋については、詳細は後述する。   Moreover, the connection part 11 formed in the both ends of the rising part 16 becomes thick, and is shape | molded by the planar U shape by having the opening 11a toward the outward of the longitudinal direction. When joining such PC foundations 12 and 12 linearly, each connection part 11 and 11 is installed facing each other. At this time, in the space of the openings 11a and 11a formed by abutting these connecting portions 11 and 11, a reinforcing bar material for joining (hereinafter referred to as a joining bar) is inserted and arranged from above. . Thereby, reinforcement | strengthening of the connection strength between the connection parts 11 and 11 is aimed at. After that, on-site cast concrete 4 (see FIGS. 20 and 21 to be described later) is placed, and by curing the concrete 4, adjacent PC foundations 12 and 12 are firmly connected to each other. Although not shown here, the details of the joining bars will be described later.

さらに、この立上り部16の下端部には、下方へ向けて先細りとなる傾斜面としてのテーパ17が形成されている。このテーパ17は、立上り部16の一方の側面側からコンクリートを打設したときに、このコンクリートが他方の側面側へと流れ込み易くするためのものである。すなわち、例えば、建物の内側からコンクリートを打設すれば、外側にもコンクリートが流れ込むこととなる。よって、外側からのコンクリート打設作業を省略できる。これにより、立上り部16における建物の外側面が、打設したコンクリートによって汚されることを未然に防止できる。加えて、テーパ17を設ける分、PC基礎10の軽量化を図ることができるため、施工に使用するクレーン等の重機を小型化できるなど施工性にも優れている。   Further, a taper 17 is formed at the lower end of the rising portion 16 as an inclined surface that tapers downward. This taper 17 is for facilitating the flow of concrete into the other side surface when the concrete is driven from one side surface of the rising portion 16. That is, for example, if concrete is laid from the inside of a building, the concrete will also flow into the outside. Therefore, the concrete placing work from the outside can be omitted. Thereby, it can prevent in advance that the outer surface of the building in the rising part 16 is soiled by the placed concrete. In addition, since the PC base 10 can be reduced in weight by the provision of the taper 17, it is excellent in workability such as downsizing heavy machinery such as a crane used for construction.

次に、フーチング部18は、立上り部16を支持するものであって、立上り部16の両側面において、内部に図示しない鉄筋を有して下部から側方および下方に突出して形成されている。   Next, the footing portion 18 supports the rising portion 16, and is formed on both side surfaces of the rising portion 16 to have a reinforcing bar (not shown) inside and project from the lower side to the side and downward.

具体的には、フーチング部18は、立上り部16の長手方向に任意に調整可能な間隔Kを空けて配置され、かつ互いに平行して立上り部16を支持する複数の支持部18a…と、立上り部16と平行に配置され、かつ複数の支持部18a…の端部同士を連結する補強材としての補助配筋材18bと、を備えており、これら支持部18a…は、強度を維持するために立上り部16の下端から下に延出する板状をなしている(図3参照)。また、本実施形態の場合、複数の支持部18a…のうち、立上り部16の長手方向両端側に位置する各支持部18aには、これらに隣り合う支持部18aとの間に、各々の端部同士を連結してフーチング形成領域のうち、端部の領域を囲む囲繞部18cを備えている。   Specifically, the footing part 18 is arranged with a plurality of support parts 18a, which are arranged at an interval K that can be arbitrarily adjusted in the longitudinal direction of the rising part 16 and supports the rising part 16 in parallel with each other. Are provided in parallel to the portion 16 and auxiliary reinforcing material 18b as a reinforcing material for connecting the ends of the plurality of support portions 18a, and these support portions 18a are for maintaining strength. The plate-like shape extends downward from the lower end of the rising portion 16 (see FIG. 3). Further, in the case of the present embodiment, among the plurality of support portions 18a..., Each support portion 18a located on both ends in the longitudinal direction of the rising portion 16 has a respective end between the support portions 18a adjacent thereto. The surrounding part 18c which connects the parts and surrounds the area | region of an edge part among the footing formation area is provided.

また、このフーチング部18は、立上り部16の長手方向の中央側に形成されており、上記連結部11の側面には、このフーチング部18が形成されない構成となっている。従って、図1に示すように、このPC基礎12は、連結部11の下面を架設部としてベース部30のPC底盤22上に載置できるようになっている。   The footing portion 18 is formed on the center side in the longitudinal direction of the rising portion 16, and the footing portion 18 is not formed on the side surface of the connecting portion 11. Therefore, as shown in FIG. 1, the PC foundation 12 can be placed on the PC bottom board 22 of the base portion 30 with the lower surface of the connecting portion 11 as the installation portion.

ここで、複数の支持部18a…の上端部には、立上り部16の下端部の形状(すなわち、テーパ17)に対応する溝部18eがそれぞれ形成されている(図3参照)。そして、立上り部16の下端部は、複数の支持部18a…の各溝部18e…に嵌合されている。これにより、立上り部16の下端部と、地盤100との間に所定空間を形成することができる。よって、この所定空間に打設したコンクリートを流れ込ますことができ、フーチング部18を地盤100に対して、より一層強固に固定できることとなる。すなわち、PC基礎12の固定強度を最大限に発揮させることができる。   Here, groove portions 18e corresponding to the shape of the lower end portion of the rising portion 16 (that is, the taper 17) are formed at the upper end portions of the plurality of support portions 18a (see FIG. 3). And the lower end part of the rising part 16 is fitted by each groove part 18e ... of several support part 18a .... Thereby, a predetermined space can be formed between the lower end portion of the rising portion 16 and the ground 100. Therefore, the concrete cast in this predetermined space can be poured, and the footing part 18 can be fixed to the ground 100 more firmly. That is, the fixing strength of the PC foundation 12 can be maximized.

また、図4に示すように、フーチング部18において、囲繞部18cの内側には、テーパ18dが形成されていることが好ましい。このような構成にすると、地盤100とフーチング部18との間に打設されたコンクリートを介して充分に上部からの荷重を伝えることが可能となる。さらに、このようにテーパ18dが形成されていることから、上方から打設されたコンクリートが抜け出るパンチングが生じるのを防止できることとなる。加えて、このような構成のPC基礎10は、製造時に中子を一体的な形状としても脱型を容易に行なうことができる。   Moreover, as shown in FIG. 4, in the footing part 18, it is preferable that the taper 18d is formed inside the surrounding part 18c. With such a configuration, it is possible to sufficiently transmit the load from the upper part through the concrete placed between the ground 100 and the footing part 18. Further, since the taper 18d is formed in this way, it is possible to prevent the punching out of the concrete cast from above. In addition, the PC foundation 10 having such a configuration can be easily removed even when the core is formed into an integral shape at the time of manufacture.

また、複数の支持部18a…間に形成された間隔Kは、現場打ちコンクリートの打設用スペースとされている。これにより、これら間隔Kにコンクリートを打設してフーチング部18を地盤100に強固に固定可能となっている。しかも、複数の支持部18a…間に形成された間隔Kは、任意に調整可能であるので、例えば標準とは異なる仕様等の間取りで建物用基礎としての布基礎1を構築するような、規定寸法と比較して変更された寸法のPC基礎10(12,14)が必要となった場合においても、当該変更された寸法に対応することができるため、歩留まりを改善してコストを抑えることができる。   Moreover, the space | interval K formed between the several support parts 18a ... is used as the space for placing on-site concrete. As a result, concrete can be placed at these intervals K to firmly fix the footing portion 18 to the ground 100. In addition, since the interval K formed between the plurality of support portions 18a can be arbitrarily adjusted, for example, the provision that the fabric foundation 1 as a building foundation is constructed with a layout different from the standard, etc. Even when the PC foundation 10 (12, 14) having a changed size compared to the size is required, the changed size can be dealt with, so that the yield can be improved and the cost can be reduced. it can.

加えて、フーチング部18は、隣接する複数の支持部18a…間に、これら支持部18a…と平行して配置される配筋材23を備えている。これにより、PC基礎12の剛性や強度を向上させることが可能となる。このとき、配筋材23の長さが、支持部18a…よりも長尺に設定されていれば、PC基礎12の剛性や強度を向上させることができる上に、フーチング部18における幅方向の寸法変更にも対応可能となる。   In addition, the footing part 18 is provided with the reinforcing material 23 arrange | positioned in parallel with these support part 18a ... between several adjacent support parts 18a .... As a result, the rigidity and strength of the PC foundation 12 can be improved. At this time, if the length of the reinforcing bar 23 is set to be longer than that of the support portion 18a, the rigidity and strength of the PC foundation 12 can be improved, and the width direction of the footing portion 18 can be improved. It is possible to respond to dimensional changes.

そして、このフーチング部18における上記間隔Kは、囲繞部18cや型枠(不図示)が設けられることにより、コンクリート充填口19として機能する。このコンクリート充填口19は、図2(a)に示すように、フーチング部18の上から下に貫通し、立上り部16と地盤100(図1)との間の空間に連通するものである。とりわけ、フーチング形成領域における端部の領域では、支持部18a,18aの端部間に囲繞部18cが配設され、その他の領域では、不図示の型枠が隣接する支持部18a…の端部間に配置されることで、コンクリート充填口19が矩形の穴状に形成される。そして、このコンクリート充填口19から立上り部16の下にコンクリートを打設して、フーチング部18を地盤100に強固に固定できるようになっている。   And the said space | interval K in this footing part 18 functions as the concrete filling port 19 by providing the surrounding part 18c and a formwork (not shown). As shown in FIG. 2A, the concrete filling port 19 penetrates from the top to the bottom of the footing portion 18 and communicates with the space between the rising portion 16 and the ground 100 (FIG. 1). In particular, in the end region in the footing formation region, the surrounding portion 18c is disposed between the end portions of the support portions 18a and 18a, and in the other regions, the end portions of the support portions 18a. By being disposed in between, the concrete filling port 19 is formed in a rectangular hole shape. Then, concrete is placed under the rising portion 16 from the concrete filling port 19 so that the footing portion 18 can be firmly fixed to the ground 100.

具体的に、複数の支持部18a…の長さ方向両端部側に、現場打ちコンクリートの打設時に使用される型枠がそれぞれ配置される。このとき、配筋材23…の長さは、型枠間の間隔と略等しく設定されている。従って、フーチング部18の周辺を囲むように配置された型枠内に現場打ちコンクリートを打設することにより、コンクリートの打設量を少なくして打設作業を容易にでき、且つ型枠が打設したコンクリートを囲むため、養生期間中の他の作業も影響を受けることなく行なうことができ、工期の短縮およびコスト削減を図ることができる。   Concretely, the formwork used at the time of placing cast-in-place concrete is arrange | positioned at the length direction both ends side of several support parts 18a ..., respectively. At this time, the length of the reinforcing bars 23 is set substantially equal to the interval between the molds. Accordingly, by placing the cast-in-place concrete in a mold placed so as to surround the periphery of the footing portion 18, it is possible to reduce the amount of cast concrete and facilitate the placing work, and the mold is cast. Since the set concrete is surrounded, other work during the curing period can be performed without being affected, and the construction period can be shortened and the cost can be reduced.

さらに、フーチング部18は、PC基礎12がベース部30、30間に架設されたときに、地盤100(図1)との間に隙間があくようになっていても良い。こうすることで、地盤100とフーチング部18との間に打設コンクリート4が流れ込んで一層しっかりと固定できることとなる。   Further, the footing portion 18 may be configured such that a gap is formed between the PC foundation 12 and the ground 100 (FIG. 1) when the PC foundation 12 is installed between the base portions 30 and 30. By doing so, the cast concrete 4 flows between the ground 100 and the footing part 18 and can be fixed more firmly.

次に、図5は、一方の端部に突出部13が形成され、他方の端部に連結部11が形成されたPC基礎14を示し、(a)はその平面図、(b)はその正面図である。   Next, FIG. 5 shows the PC base 14 in which the protruding portion 13 is formed at one end and the connecting portion 11 is formed at the other end, (a) is a plan view thereof, and (b) is the plan view thereof. It is a front view.

このPC基礎14は、建物の構築領域において隅部となる出隅位置に設置されるもので、出隅側に位置する一方の端部に突出部13を有する点において、上記PC基礎12と異なって構成されている。   This PC foundation 14 is installed at a corner position that is a corner in a building construction area, and differs from the PC foundation 12 in that it has a protruding portion 13 at one end located on the corner side. Configured.

突出部13は、基礎出隅のコーナー部において、上記PC基礎12と直角に接合されるため、立上り部16の一方の出隅側の端部に出隅に沿って長手方向の軸に直角に突出して形成されるものである。   Since the protruding portion 13 is joined to the PC foundation 12 at a right angle at the corner portion of the foundation protruding corner, the protruding portion 13 is perpendicular to the longitudinal axis along the protruding corner at one end of the rising portion 16 on the protruding corner side. It is formed to protrude.

その結果、この突出部13によって、出隅側の端部に直角な外面角部13aが形成されることとなり、この外面角部13aはPC基礎14を設置した状態で、出隅角部に相当することとなり、この外面角部13aを基準とすることにより、容易に対角寸法を測定することが可能となる。   As a result, the protruding portion 13 forms an outer surface corner portion 13a perpendicular to the end portion on the protruding corner side. This outer surface corner portion 13a corresponds to the protruding corner portion with the PC foundation 14 installed. Therefore, the diagonal dimension can be easily measured by using the outer corner portion 13a as a reference.

そして、この突出部13の前端面からは、図示省略する接合筋の一方の端部側が突出して(すなわち、接合筋の他方の端部が突出部13の前端面内に埋設され)ており、この接合筋を、対向して配置されるPC基礎12の連結部11に挿入し、この連結部11にコンクリートを打設、養生し固化したときに、PC基礎12とPC基礎14とがしっかりと結合されるようになっている。   And, from the front end surface of the projecting portion 13, one end portion side of the joining bar not shown projects (that is, the other end portion of the joining bar is embedded in the front end surface of the projecting portion 13), When this joining bar is inserted into the connecting part 11 of the PC foundation 12 arranged opposite to the concrete, and the concrete is placed in the connecting part 11 and cured and solidified, the PC foundation 12 and the PC foundation 14 are firmly fixed. It is supposed to be combined.

また、この突出部13が形成された端部にはフーチング部18が形成されず、フーチング部18は立上り部16の中央側に形成された構成となっている。その他の構成は上記PC基礎12とほぼ同様であるため、重複する説明は割愛する。   Further, the footing portion 18 is not formed at the end where the protruding portion 13 is formed, and the footing portion 18 is formed on the center side of the rising portion 16. Other configurations are almost the same as those of the PC base 12 described above, and thus redundant description is omitted.

なお、PC基礎12および14は、いずれも予め工場で表面が処理された状態となっている。また、PC基礎10(12,14)の全体形状としては、長手方向における少なくとも一方の端部が上記連結部11とされていれることを除いて各種形状のものを適用可能とする。さらに、フーチング部18は、立上り部16と一体に成形されていても良いし、根切り部20に配筋材を配置した後、現場打ちコンクリート4によって成形されても良い。   Note that the PC foundations 12 and 14 are both in a state where the surface has been previously processed in the factory. In addition, as the overall shape of the PC foundation 10 (12, 14), various shapes can be applied except that at least one end in the longitudinal direction is the connecting portion 11. Further, the footing portion 18 may be formed integrally with the rising portion 16, or may be formed by the cast-in-place concrete 4 after arranging the reinforcing material in the root cutting portion 20.

ここで、本実施形態の場合、図6(a)および(b)に示すように、PC基礎12および14(以下、共通する説明の際は総じてPC基礎10と称す)は、開口11aを含む平面コ字形状の連結部11に対し、当該連結部11の厚み方向に貫通される貫通手段33を備えている。この貫通手段33は、ボルト33aや不図示のナット等からなり、連結部11の開口11a内に配置された接合筋3のうち、少なくとも一対の横配筋31,31間における上方側であって、当該上方側の横配筋31における水平方向の両端部間に位置するように配置される。この場合、連結部11には、前述した位置に応じて一方の側面11b側から開口11a内へ貫通する貫通孔34が貫設されていると共に、他方の側面11c側の開口11a内における上記貫通孔34の延長線上には、貫通孔34を貫通して配置されるボルト33aと螺合するナット(不図示)を埋設するための穴35が穿設されている。   Here, in the case of the present embodiment, as shown in FIGS. 6A and 6B, the PC foundations 12 and 14 (hereinafter collectively referred to as the PC foundation 10 in the common description) include an opening 11a. With respect to the connecting portion 11 having a U-shaped plane, a penetrating means 33 that penetrates in the thickness direction of the connecting portion 11 is provided. The penetrating means 33 includes a bolt 33a, a nut (not shown), and the like, and is an upper side between at least a pair of laterally arranged bars 31 and 31 among the connecting bars 3 disposed in the opening 11a of the connecting portion 11. The upper horizontal bar 31 is disposed between both ends in the horizontal direction. In this case, the connecting portion 11 is provided with a through hole 34 penetrating from the one side surface 11b side into the opening 11a in accordance with the position described above, and the above penetration in the opening 11a on the other side surface 11c side. On the extension line of the hole 34, a hole 35 is formed for embedding a nut (not shown) that is screwed with a bolt 33 a disposed through the through hole 34.

因みに、本実施形態におけるPC基礎10の場合、開口11a内の他方の側面11c側には、対向する一方の側面11bに向けて突出する複数(この場合、3つ)の凸部24aが、当該開口11aの内方側から上記外方側に亘って延在するように設けられている。このため、開口11a内の他方の側面11c側において、凸部24a以外の部位(例えば、隣接する凸部24a,24aによって挟まれた当該凸部24a,24aを連結する部位など)は、凸部24aよりも窪んだ底面部24bとなっている。従って、上述のごとく打設されたコンクリート4(後述の図20,21等参照)が、凸部24aと底面部24bとによる凹凸に絡まり、凸部24aが形成されない場合と比較して上方への抜けが抑制される分、連結部11,11間の連結強度を増すことができる。   Incidentally, in the case of the PC foundation 10 in the present embodiment, a plurality of (in this case, three) convex portions 24a projecting toward the opposite side surface 11b are provided on the other side surface 11c side in the opening 11a. It is provided so as to extend from the inner side of the opening 11a to the outer side. For this reason, on the other side surface 11c side in the opening 11a, a portion other than the convex portion 24a (for example, a portion connecting the convex portions 24a and 24a sandwiched between the adjacent convex portions 24a and 24a) is a convex portion. It is a bottom surface portion 24b that is recessed from 24a. Accordingly, the concrete 4 (see FIGS. 20, 21 and the like described later) placed as described above is entangled with the irregularities formed by the convex portions 24a and the bottom surface portion 24b, and is upward compared to the case where the convex portions 24a are not formed. Since the disconnection is suppressed, the connection strength between the connection parts 11 and 11 can be increased.

また、これら凸部24a…は、上記開口11aの内方側から外方側へ向けた両側部および、これら両側部を結ぶ開口11aの入口部分に位置する最外部に、上記一方の側面11b側に対峙する天面25a側から底面部24b側へ向けて下り方向のテーパ状に傾斜する傾斜部25b,25cが設けられていることが好ましい。さらに、これら凸部24a…は、開口11aの内方側から外方側へ向けて先細りとなるように、当該開口11aの外方側よりも内方側が幅広に設定されていることが好ましい。加えて、これら凸部24a…は、開口11aの内方側から外方側へ向けて厚みが薄く(突出量が少なく)なるように、上記天面25a自体が底面部24b側へ向けて下り方向に傾斜していることが好ましい。   Further, the convex portions 24a are formed on both sides of the opening 11a from the inner side to the outer side and on the outermost part located at the entrance portion of the opening 11a connecting the both sides. It is preferable that inclined portions 25b and 25c which are inclined in a downward taper direction from the top surface 25a side to the bottom surface portion 24b side are provided. Further, it is preferable that the convex portions 24a... Are set wider on the inner side than the outer side of the opening 11a so as to taper from the inner side to the outer side of the opening 11a. In addition, the top surface 25a itself descends toward the bottom surface portion 24b so that the thickness of the convex portions 24a... Decreases from the inner side to the outer side of the opening 11a. It is preferable to incline in the direction.

このように、凸部24a…に各種傾斜を設けることで、開口11a内に打設されるコンクリート4(後述の図21等参照)が流れ込み易くなり、気泡ができることなく細部にまで行き渡らせることが可能となる。すなわち、コンクリートの打設作業における作業効率を格段と向上させることができる。しかも、凸部24a…は、上述のように先細りとなるように、開口11aの外方側よりも内方側が幅広に設定されているので、PC基礎製造時に連結部11を成形する作業において、当該開口11aを形成するための型枠が抜け易くなる分、作業性が向上し、製造効率の向上を図ることができる。   In this way, by providing various inclinations on the convex portions 24a, the concrete 4 (see FIG. 21 and the like described later) placed in the opening 11a can easily flow, and can be spread to details without forming bubbles. It becomes possible. That is, the work efficiency in concrete placing work can be remarkably improved. In addition, since the convex portion 24a is set to be wider on the inner side than the outer side of the opening 11a so as to be tapered as described above, in the operation of forming the connecting portion 11 at the time of PC foundation manufacturing, As the mold for forming the opening 11a is easily removed, the workability is improved and the production efficiency can be improved.

また、これらPC基礎10を連結する際に、連結部11,11を突き合わせることによって形成される開口11a,11aの空間内に上方から挿入配置される接合筋3は、連結部11の開口11a内における垂直方向の上下に離間した位置に配置され、各々水平方向に延在する一対の横配筋31,31と、これら一対の横配筋31,31間に配置され、当該横配筋31,31同士を垂直方向に連結する縦配筋32と、を有している。   Further, when connecting these PC foundations 10, the joint bars 3 inserted and arranged from above into the space of the openings 11 a, 11 a formed by abutting the connecting portions 11, 11 are the openings 11 a of the connecting portion 11. A pair of lateral reinforcement bars 31 and 31 that are arranged at positions spaced apart in the vertical direction in the interior and extend in the horizontal direction, and are arranged between the pair of lateral reinforcement bars 31 and 31. , 31 are vertically arranged to connect each other in the vertical direction.

このとき、接合筋3は、少なくとも上方側の横配筋31における連結部11の開口11a内に位置する端部が、縦配筋32側に向けて曲折されてなるフック状の引掛部31aとされ、貫通手段33が、引掛部31a近傍に配設されていることが好ましい。
この場合、連結部11の開口11a内に配置された接合筋3が、この開口11a内から抜け出ようとしても、当該貫通手段33が引掛部31aに引っ掛かったり、上下一対の横配筋31,31に当接したりすることで、当該開口11a内から抜け出ることを未然に防止できる。
At this time, the joining bar 3 includes a hook-like hooking part 31a formed by bending at least an end part located in the opening 11a of the connecting part 11 in the upper horizontal bar 31 to the vertical bar 32 side. The penetrating means 33 is preferably disposed in the vicinity of the hook portion 31a.
In this case, even if the joining bar 3 arranged in the opening 11a of the connecting part 11 tries to come out of the opening 11a, the penetrating means 33 is caught by the hooking part 31a, or a pair of upper and lower horizontal reinforcing bars 31, 31 is used. Can be prevented from coming out of the opening 11a.

また、貫通手段33は、連結部11に配置された接合筋3のうち、一対の横配筋31,31間における上方側および下方側の各横配筋31,31における水平方向の両端部間にそれぞれ配設されていることが好ましい。この場合、連結部11の開口11a内に配置された接合筋3が、この開口11a内から抜け出ようとしても、当該開口11a内の上下に一対で設けられた横配筋31,31と貫通手段33とが当接することで、当該開口11a内から抜け出ることを確実に防止できる。   Further, the penetrating means 33 is provided between the horizontal ends of the horizontal bars 31, 31 on the upper side and the lower side between the pair of horizontal bars 31, 31 among the connecting bars 3 arranged in the connecting portion 11. It is preferable that they are respectively disposed. In this case, even if the joining bar 3 arranged in the opening 11a of the connecting part 11 tries to come out of the opening 11a, a pair of horizontal bars 31, 31 and penetrating means provided on the upper and lower sides in the opening 11a. By coming into contact with 33, it can be reliably prevented from coming out of the opening 11a.

さらに、接合筋3は、上方側および下方側の横配筋31,31における連結部11の開口11a内に位置する端部が、それぞれ縦配筋32側に向けて曲折されてなる引掛部31aとされ、貫通手段33が、上方側および下方側の各引掛部31a近傍にそれぞれ配設されていることが望ましい。   Further, the connecting bar 3 has hook portions 31a formed by bending the end portions of the upper and lower lateral bars 31, 31 located in the opening 11a of the connecting portion 11 toward the vertical bars 32, respectively. It is desirable that the penetrating means 33 be disposed in the vicinity of the upper and lower hooking portions 31a.

この場合、連結部11の開口11a内に配置された接合筋3が、この開口11a内から抜け出ようとしても、上方側および下方側の各引掛部31aに貫通手段33が引っ掛かることで、当該開口11a内から抜け出ることをより確実に防止できる。しかも、このとき、貫通手段33と各引掛部31aとがより近接した位置関係であれば、連結部11の開口11a内において接合筋3が動いたり、位置がずれたりすることも防止できる。よって、接合筋3を連結部11の開口11a内に最適な状態で配設することができ、当該接合筋3によるPC基礎10同士の連結強度を最大限に発揮させることができる。   In this case, even if the joining bar 3 arranged in the opening 11a of the connecting portion 11 tries to come out of the opening 11a, the opening means 33 is hooked on the upper and lower hooking portions 31a. It is possible to more reliably prevent the escape from the inside of 11a. In addition, at this time, if the penetrating means 33 and each hooking portion 31a are closer to each other, it is possible to prevent the joining bar 3 from moving or being displaced in the opening 11a of the connecting portion 11. Therefore, the joining bar | burr 3 can be arrange | positioned in the optimal state in the opening 11a of the connection part 11, and the connection strength of PC foundations 10 by the said joining bar | burr 3 can be exhibited to the maximum.

加えて、接合筋3は、一対の横配筋31,31間の水平方向における所定の離間した位置に一対の縦配筋32,32が配置され、貫通手段33が、少なくとも一対の縦配筋32,32間に配設されていることが望ましい。
この場合、連結部11の開口11a内において、接合筋3が水平方向に移動することも抑制できる。
In addition, in the joining bar 3, a pair of vertical bars 32, 32 are disposed at predetermined spaced positions in the horizontal direction between the pair of horizontal bars 31, 31, and the penetrating means 33 includes at least a pair of vertical bars. It is desirable to be disposed between 32 and 32.
In this case, in the opening 11a of the connection part 11, it can also suppress that the joining bar | burr 3 moves to a horizontal direction.

このように、かかるPC基礎10では、連結部11の開口11a内に接合筋3を配置してから当該連結部11に貫通手段33を配設することが可能となっているため、PC基礎10の連結部11に対して連結強度の強化を図る接合筋3を配置することが容易となる。
このとき、連結部11は当該PC基礎10の長手方向の外方に向けた開口11aを有することによって平面コ字形状に成形されている。つまり、連結部11は従来と比して開口11aが平面コ字形状に一体で成形されている。従って、連結部が第1部材と第2部材とをボルト締結するように別体成形された従来品と比較して部品点数を低減でき、コストを抑えることができる。しかも、一体成形されている分、ボルト締結するための作業工数も削減できる。
Thus, in this PC foundation 10, since it is possible to arrange | position the penetration means 33 in the said connection part 11 after arrange | positioning the joining bar | burr 3 in the opening 11a of the connection part 11, PC foundation 10 It becomes easy to arrange the joining bars 3 for strengthening the connection strength with respect to the connection part 11.
At this time, the connecting portion 11 is formed into a planar U-shape by having an opening 11 a directed outward in the longitudinal direction of the PC base 10. That is, the connecting part 11 has an opening 11a integrally formed in a U-shaped plane as compared with the conventional case. Therefore, the number of parts can be reduced and the cost can be reduced as compared with a conventional product in which the connecting portion is separately molded so that the first member and the second member are bolted together. In addition, the number of work steps for fastening the bolts can be reduced by the integral molding.

また、PC基礎10は開口11aを含む平面コ字形状の連結部11に対し、当該連結部11の厚み方向に貫通される貫通手段33を備えているので、連結部11の開口11a内にコンクリート4を打設することによって、当該開口11aの厚み方向に生じる剪断応力に対して効果的な補強を図ることができる。   Moreover, since the PC base 10 is provided with the penetration means 33 penetrated in the thickness direction of the said connection part 11 with respect to the planar U-shaped connection part 11 containing the opening 11a, it is concrete in the opening 11a of the connection part 11. 4 can be effectively reinforced against shear stress generated in the thickness direction of the opening 11a.

なお、ここで説明した接合筋3は一例であって、その形状としてはこれに限ることはない。例えば、連結部11の開口11a内に配置された接合筋3の一方の端部に対して反対側となる他方の端部が、当該連結部11に隣接する他のPC基礎10(例えばPC基礎14)に埋設されていても良い。すなわち、接合筋3の他方の端部が埋設された他のPC基礎14から当該接合筋3の一方の端部が突出していても良い。この場合、他のPC基礎14から突出している接合筋3の一方の端部が、連結部11の開口11a内に位置するようにPC基礎12を配置して接合することにより、これらPC基礎12,14同士の連結強度を確実に強化できる。また、この場合、接合筋3の他方の端部が他のPC基礎14に埋設されるので、当該接合筋3における縦配筋32は設けなくても良い。   In addition, the joining bar | burr 3 demonstrated here is an example, Comprising: The shape is not restricted to this. For example, the other end that is opposite to the one end of the joint 3 disposed in the opening 11 a of the connecting portion 11 is another PC foundation 10 (for example, a PC foundation that is adjacent to the connecting portion 11). It may be embedded in 14). That is, one end portion of the joining bar 3 may protrude from another PC foundation 14 in which the other end portion of the joining bar 3 is embedded. In this case, the PC foundation 12 is arranged and joined so that one end of the joining bar 3 protruding from the other PC foundation 14 is positioned in the opening 11 a of the connecting portion 11. , 14 can be reliably strengthened. In this case, since the other end of the joining bar 3 is embedded in another PC foundation 14, the vertical bar 32 in the joining bar 3 may not be provided.

ここで、かかるPC基礎10,10同士の連結における接合態様について、図7を参照しながら説明する。なお、ここでは、便宜上、貫通手段33の図示は省略する。また、以下に説明するPC基礎10の接合態様は一例であって、これに限られるものではない。
図7に示すように、PC基礎10,10同士の接合態様としては、大きく分けてI形接合,L形接合,T形接合,X形接合の4種類が挙げられる。
Here, the joining aspect in connection of this PC foundation 10 and 10 is demonstrated, referring FIG. Here, illustration of the penetrating means 33 is omitted for convenience. Moreover, the joining aspect of the PC foundation 10 demonstrated below is an example, Comprising: It is not restricted to this.
As shown in FIG. 7, the PC bases 10, 10 can be roughly divided into four types, i.e., I-type joint, L-type joint, T-type joint, and X-type joint.

PC基礎10,10同士を直線上に連結するI形接合には、上記連結部11,11同士を対向させるI−1タイプと、連結部11と上記突出部13が設けられる端部とを対向させるI−2タイプとがある。前者の場合、連結部11,11同士が対向することによって、開口11a,11によって形成される空間に接合筋3がインサートされ、連結強度が向上されている。また、後者の場合、接合筋3の一方の端部側が突出部13を有するPC基礎10の端部内に埋設され、接合筋3の他方の端部側が対向するPC基礎10の連結部11の開口11a内にインサートされ、連結強度が向上されている。   For the I-shaped joint that connects the PC foundations 10 and 10 in a straight line, the I-1 type that makes the connecting portions 11 and 11 face each other, and the end portion on which the connecting portion 11 and the protruding portion 13 are provided are opposed to each other. There are I-2 types. In the former case, the connecting portions 11 are opposed to each other, so that the joining bar 3 is inserted into the space formed by the openings 11a and 11, and the connection strength is improved. In the latter case, one end side of the joining bar 3 is embedded in the end part of the PC foundation 10 having the protruding part 13, and the opening of the connecting part 11 of the PC foundation 10 facing the other end part side of the joining bar 3. It is inserted in 11a, and the connection strength is improved.

PC基礎10,10同士をL字状に連結するL形接合には、連結部11と突出部13とを対向させるL−1タイプと、連結部11と当該連結部11や上記突出部13が設けられていない端部の側部とを対向させるL−2タイプとがある。前者の場合、接合筋3の一方の端部側が突出部13内に埋設され、接合筋3の他方の端部側が対向するPC基礎10の連結部11の開口11a内にインサートされ、連結強度が向上されている。また、後者の場合、PC基礎10の端部内に接合筋3の一方の端部側が埋設され、接合筋3の他方の端部側が対向するPC基礎10の連結部11の開口11a内にインサートされ、連結強度が向上される。なお、このようなL形接合は、建物の隅部に配置されている。   For the L-shaped joint that connects the PC foundations 10 and 10 in an L shape, the L-1 type that makes the connecting portion 11 and the protruding portion 13 face each other, the connecting portion 11, the connecting portion 11, and the protruding portion 13 are provided. There is an L-2 type that faces the side portion of the end portion that is not provided. In the former case, one end side of the joining bar 3 is embedded in the protruding part 13, and the other end side of the joining bar 3 is inserted into the opening 11 a of the connecting part 11 of the PC foundation 10, and the connection strength is increased. Has been improved. In the latter case, one end side of the joining bar 3 is embedded in the end part of the PC foundation 10, and the other end side of the joining bar 3 is inserted into the opening 11a of the connecting part 11 of the PC foundation 10 facing each other. The connection strength is improved. Such an L-shaped joint is arranged at a corner of a building.

複数のPC基礎10…をT字状に連結するT形接合には、以下の4タイプがある。まず、連結部11,11同士を対向させ、これら対向する連結部11,11間に、もう一つの連結部11を直交させるT−1タイプがある。この場合、対向する連結部11,11同士の開口11a,11による空間に接合筋3がインサートされると共に、この接合筋3に直交して、もう一つの連結部11の開口11a内に一方の端部がインサートされた接合筋3の他方の端部が係合されることで、連結強度が向上されている。   There are the following four types of T-shaped joints that connect a plurality of PC foundations 10 in a T-shape. First, there is a T-1 type in which the connecting portions 11 and 11 are opposed to each other, and another connecting portion 11 is orthogonally crossed between the facing connecting portions 11 and 11. In this case, the joining bar 3 is inserted into the space formed by the openings 11a and 11 between the opposing connecting parts 11 and 11, and one of the connecting parts 11 is inserted into the opening 11a of the other connecting part 11 perpendicular to the connecting bar 3. The connection strength is improved by engaging the other end of the joining bar 3 in which the end is inserted.

次に、連結部11と上記突出部13が設けられる端部とを直線上に対向させると共に、当該突出部13ともう一つの連結部11とをL字状に対向させるT−2タイプがある。すなわち、このT−2タイプは、上述したI−2タイプとL−1タイプとを組み合わせたものである。この場合、PC基礎10の端部内に接合筋3の一方の端部側が埋設され、接合筋3の他方の端部側が対向するPC基礎10の連結部11の開口11a内にインサートされると共に、もう一つの接合筋3における一方の端部側が突出部13内に埋設され、この接合筋3の他方の端部側が対向するPC基礎10の連結部11の開口11a内にインサートされることで、連結強度が向上されている。   Next, there is a T-2 type in which the connecting portion 11 and the end portion where the protruding portion 13 is provided are linearly opposed, and the protruding portion 13 and the other connecting portion 11 are opposed in an L shape. . That is, the T-2 type is a combination of the above-described I-2 type and L-1 type. In this case, one end portion side of the joining bar 3 is embedded in the end portion of the PC foundation 10, and the other end side of the joining bar 3 is inserted into the opening 11a of the connecting portion 11 of the PC foundation 10, and One end side of the other joining bar 3 is embedded in the projecting portion 13, and the other end side of the joining bar 3 is inserted into the opening 11 a of the connecting portion 11 of the PC foundation 10, The connection strength is improved.

また、PC基礎10の端部以外の部位に連結部11を直交させるT−3タイプがある。この場合、PC基礎10内に接合筋3の一方の端部側が埋設され、接合筋3の他方の端部側が、直交するPC基礎10の連結部11の開口11a内にインサートされることで、連結強度が向上されている。
さらに、上述したT−3タイプにおけるPC基礎10の端部以外の連結部11が直交する仕口部分に窪み部10aが設けられ、当該窪み部10aに上記直交する連結部11を嵌合させるT−4タイプがある。この場合、PC基礎10の窪み部10a内に接合筋3の一方の端部側が埋設され、接合筋3の他方の端部側が、上記直交するように嵌合されるPC基礎10の連結部11の開口11a内にインサートされることで、連結強度が向上されている。
Further, there is a T-3 type in which the connecting portion 11 is orthogonal to a portion other than the end portion of the PC base 10. In this case, one end side of the joining bar 3 is embedded in the PC foundation 10, and the other end side of the joining bar 3 is inserted into the opening 11a of the connecting part 11 of the PC foundation 10 orthogonal to each other. The connection strength is improved.
Furthermore, the hollow part 10a is provided in the joint part in which the connection parts 11 other than the edge part of the PC foundation 10 in the T-3 type mentioned above are orthogonal, and the said connection part 11 orthogonal to the said hollow part 10a is fitted. There are -4 types. In this case, one end part side of the joining bar 3 is embedded in the hollow part 10a of the PC foundation 10, and the other end part side of the joining bar 3 is fitted so as to be orthogonal to the connecting part 11 of the PC foundation 10. The connection strength is improved by being inserted into the opening 11a.

複数のPC基礎10…をX字状(すなわち、十字状)に連結するX形接合には、以下の3タイプがある。まず、PC基礎10の端部以外の部位の両側に、それぞれ連結部11を直交させるX−1タイプがある。すなわち、このX−1タイプは、上述したT−3タイプを2つ組み合わせたものであり、さらに換言すれば、2つの連結部11,11が対向配置される上述したI−1タイプの当該連結部11,11間に、他のPC基礎10が介在された形状をなしている。この場合、対向配置されるPC基礎10,10の各連結部11,11の開口11a,11内に接合筋3,3の一方の端部が各々インサートされ、これら接合筋3,3の他方の端部が、それぞれPC基礎10内に埋設されることで、連結強度が向上されている。このとき、対向配置される連結部11,11のうちの一方が、直交する仕口部分に窪み部10aが設けられ、当該窪み部10aに当該直交する連結部11を嵌合させる、すなわちT−4タイプと、上記T−3タイプとを組み合わせたX−2タイプもある。   There are the following three types of X-shaped joints that connect a plurality of PC foundations 10 in an X shape (that is, a cross shape). First, there are X-1 types in which the connecting portions 11 are orthogonal to each other on both sides of the portion other than the end portion of the PC foundation 10. That is, this X-1 type is a combination of the above-mentioned two T-3 types. In other words, the above-mentioned I-1 type connection in which the two connecting portions 11, 11 are arranged to face each other. Another PC base 10 is interposed between the portions 11 and 11. In this case, one end of each of the joining bars 3 and 3 is inserted into the openings 11a and 11 of the connecting parts 11 and 11 of the PC foundations 10 and 10 that are arranged to face each other. Since the end portions are embedded in the PC foundation 10, the connection strength is improved. At this time, one of the connecting portions 11 and 11 that are arranged to face each other is provided with a recess 10a in a joint portion that is orthogonal, and the orthogonal connecting portion 11 is fitted into the recess 10a. There is also an X-2 type that combines four types and the T-3 type.

また、上述のT−2タイプに更にPC基礎10を加え、上記突出部13に連結される連結部11に対向するように、当該突出部13の反対側に新たなPC基礎10の連結部11を連結させるX−3タイプがある。この場合、新たに加えられたPC基礎10は、その連結部11における開口11a内に接合筋3の一方の端部側がインサートされ、他方の端部側が上記突出部13の反対側となる端部内に埋設されることで、連結強度が向上されている。   Further, the PC base 10 is further added to the above-described T-2 type, and the connecting portion 11 of the new PC base 10 is arranged on the opposite side of the protruding portion 13 so as to face the connecting portion 11 connected to the protruding portion 13. There is an X-3 type that connects the two. In this case, the newly added PC foundation 10 is inserted into the opening 11a of the connecting portion 11 in the end portion where one end portion side of the joining bar 3 is inserted and the other end portion side is opposite to the protruding portion 13. As a result, the connection strength is improved.

以上、ここまでは、PC基礎10,10同士の連結におけるI形接合,L形接合,T形接合,X形接合の4種類の接合態様について説明したが、これらはいずれも建物の構造壁(耐力壁)に対応する布基礎1を構築するため、接合筋3を用いて強固に接合されるものである。これに対して、建物の構造壁ではない壁などが配置される部位に対応する布基礎1側においては、上述のような強固な接合強度は必要なく、鉛直方向に支えることができれば良いため、以下のような接合態様が用いられる。   Up to this point, the description has been given of the four types of joining modes of I-type joining, L-type joining, T-type joining, and X-type joining in the connection between the PC foundations 10, 10. In order to construct the fabric foundation 1 corresponding to the bearing wall), the fabric foundation 1 is firmly joined using the joining bars 3. On the other hand, on the fabric foundation 1 side corresponding to the part where the wall that is not the structural wall of the building is arranged, it is not necessary to have strong bonding strength as described above, so long as it can be supported in the vertical direction. The following joining modes are used.

すなわち、図8(a)に示すように、建物の玄関ホール70に接続された廊下71に面して配置される収納スペース72の出入口扉73などが構造壁ではない壁に該当する。このとき、当該出入口扉73に対応する布基礎1側では、図8(b)に示すように、収納スペース72の側壁74,74(図8(a)参照)に対応するPC基礎10,10間に基礎部材75が架設されている。そして、この基礎部材75は、両端部がPC基礎10,10の対応する位置に設けられた窪み部76、76にモルタル(不図示)を介して差し込まれ、当該モルタルによって接合されている。   That is, as shown in FIG. 8A, the entrance door 73 of the storage space 72 arranged facing the corridor 71 connected to the entrance hall 70 of the building corresponds to a wall that is not a structural wall. At this time, on the cloth foundation 1 side corresponding to the entrance door 73, as shown in FIG. 8B, the PC foundations 10 and 10 corresponding to the side walls 74 and 74 of the storage space 72 (see FIG. 8A). A base member 75 is installed between them. The both ends of the foundation member 75 are inserted into recesses 76 and 76 provided at corresponding positions of the PC foundations 10 and 10 via mortar (not shown), and are joined by the mortar.

次に、このような構成からなるPC基礎10によって構築される布基礎1の施工方法について、図9〜図22を参照しながら説明する。
図9(a)に示すように、まず、建物の構築領域の地盤100を連続的に掘削して根切り部20を形成する。この根切り部20は、PC基礎10の設置部分に形成されている。ここで、根切作業では、バックホー等の重機で根切り、スコップ等により手掘り調整しながら所定の深さまで地盤100を掘る。所定の深さまで地盤100を掘削したら、砕石や砂利を敷き込み、タンピングランマーやプレートコンパクター等の重機を用いて転圧することで、根切り部20内の地盤を締め固めて平らにならす。そして、地業レベルを完全自動レベル装置40と受光器41等からなるレーザー光線による水準装置を用いて計測し、砕石転圧後のレベルチェックを行う。また、レベルチェック後にレベル調整を行った際には、再度、所定の重機にて締め固めやならしを行う。このように、根切作業では、水平レベルを調整し、平行(平坦)を確認しながら砕石や砂利を敷く。
Next, the construction method of the cloth foundation 1 constructed by the PC foundation 10 having such a configuration will be described with reference to FIGS.
As shown in FIG. 9A, first, the ground 100 in the building construction area is continuously excavated to form the root cutting part 20. This root cutting part 20 is formed in the installation part of the PC foundation 10. Here, in the root cutting work, the ground 100 is dug to a predetermined depth while performing root cutting with a heavy machine such as a backhoe, and manual digging with a scoop or the like. After excavating the ground 100 to a predetermined depth, the ground in the root cutting part 20 is compacted and leveled by laying crushed stones and gravel and rolling with heavy machinery such as a tamping rammer or plate compactor. Then, the ground level is measured using a level device using a laser beam composed of a fully automatic level device 40 and a light receiver 41, and a level check after crushed stone rolling is performed. Further, when level adjustment is performed after the level check, compaction and leveling are performed again with a predetermined heavy machine. Thus, in the root cutting work, the horizontal level is adjusted, and crushed stones and gravel are laid while confirming parallelism (flatness).

次いで、根切り部20内に所定間隔で複数のベース部30を設置する。これらベース部30は、PC基礎10の連結位置に設置されるようになっている。具体的には、図9(b)に示すように、基礎(布基礎1)の仕上がりの外側に杭42と貫き43からなる遣方44を設け、対向する貫き43,43間に基礎の中心線となる水糸45を張る。すなわち、遣方44から基礎土台の通りである根切り部20に対して水糸45を張り、ベース部30の設置箇所を確認する。このとき、水糸45,45が交差した位置がベース部30の設置箇所となる。そして、これら水糸45,45の交差した位置から下げ振り46を下げてポイントPを出す(図10(a))。このとき、当該下げ振り46の芯上に位置する十分に転圧された砕石等に塗装用スプレー47等で目印を付けておく。そして、図10(b)に示すように、当該ポイントPを中心とする所定の振り分け位置(例えば、150,250で振り分ける)にベース部30のPC底盤22を設置するためのセット治具48をセットする。   Next, a plurality of base portions 30 are installed at predetermined intervals in the root cutting portion 20. These base portions 30 are installed at the connecting positions of the PC foundation 10. Specifically, as shown in FIG. 9 (b), a way 44 consisting of a pile 42 and a through 43 is provided on the outer side of the foundation (fabric foundation 1), and the center of the foundation is formed between the opposing throughs 43, 43. The water thread 45 to be a line is stretched. That is, the water string 45 is stretched from the way 44 to the root cutting part 20 as the foundation foundation, and the installation location of the base part 30 is confirmed. At this time, the position where the water threads 45, 45 intersect is the installation location of the base portion 30. Then, the point P is obtained by lowering the downward swing 46 from the position where the water threads 45, 45 intersect (FIG. 10A). At this time, a mark is put on a sufficiently compacted crushed stone or the like located on the core of the downward swing 46 with a coating spray 47 or the like. Then, as shown in FIG. 10B, a setting jig 48 for installing the PC bottom board 22 of the base portion 30 at a predetermined distribution position (for example, distribution at 150, 250) centered on the point P is provided. set.

そして、セット治具48の天端まで敷きモルタル21を充填し(図11(a))、コテ49等で平坦にならした後、図11(b)に示すように、PC底盤22(図1等参照)を設置する際の空気抜きのため、敷きモルタル21の中央部分をコテ49等でくり抜く。この後、図12(a)および(b)に示すように、セット治具48内にPC底盤22を落とし込み、敷きモルタル21上に載置した後、図13(a)に示すように、セット治具48を取り除く。   Then, the mortar 21 is spread to the top end of the setting jig 48 (FIG. 11 (a)) and flattened with a trowel 49 or the like, and then, as shown in FIG. 11 (b), the PC bottom board 22 (FIG. 1). For example, the center portion of the mortar 21 is hollowed out with a trowel 49 or the like. Thereafter, as shown in FIGS. 12 (a) and 12 (b), the PC bottom board 22 is dropped into the setting jig 48 and placed on the mortar 21, and then set as shown in FIG. 13 (a). The jig 48 is removed.

次に、図13(b)に示すように、PC底盤22上に水準器50を載せ、完全自動レベル装置40と受光器41等からなるレーザー光線による水準装置等を用いて計測しながら、PC底盤22の表面をゴムハンマー51でたたいて、ベース部30の水平レベルおよび高さレベルを調整する。このとき、図14に示す矢印A〜Fの部分について、水準器50で水平レベルを確認する。
このようにして、ベース部30は、PC基礎10の連結位置に敷設される敷きモルタル22上に、PC底盤22が載置されることで設置されるようになっている。なお、ここでは図示省略するが、この後、ベース部30の上面に設置位置の墨出しを行い、位置合わせを行う。
Next, as shown in FIG. 13 (b), a level 50 is placed on the PC bottom plate 22, and the PC bottom plate is measured using a laser beam level device comprising a fully automatic level device 40 and a light receiver 41. The surface of 22 is hit with a rubber hammer 51 to adjust the horizontal level and height level of the base portion 30. At this time, a horizontal level is confirmed with the level 50 about the part of the arrows AF shown in FIG.
In this way, the base portion 30 is installed by placing the PC bottom board 22 on the mortar 22 laid at the connection position of the PC foundation 10. Although not shown here, after that, the installation position is marked on the upper surface of the base portion 30 to perform alignment.

そして、図15(a)に示すように、所定間隔で所定の位置にベース部30が設置された根切り部20(基礎土台の通り)に対して型枠52を設置すると共に、図15(b)に示すように、各ベース部30間に所定間隔でスペーサ53を配置する。このスペーサ53には、この後、PC基礎10を配設した際にフーチング部18における支持部18aが載置される。これにより、フーチング部18と地盤100との間に、スペーサ53の高さ分のスペースが確保されるため、打設コンクリートを当該スペースに流れ込ませることができ、PC基礎10の地盤100に対する固定強度を格段と高めることが可能となる。   And as shown to Fig.15 (a), while installing the formwork 52 with respect to the root cutting part 20 (as the foundation foundation) in which the base part 30 was installed in the predetermined position at predetermined intervals, FIG. As shown in b), spacers 53 are arranged at predetermined intervals between the base portions 30. Thereafter, the support portion 18a of the footing portion 18 is placed on the spacer 53 when the PC foundation 10 is disposed. Thereby, since the space for the height of the spacer 53 is ensured between the footing part 18 and the ground 100, the placement concrete can be poured into the said space, and the fixed strength with respect to the ground 100 of the PC foundation 10 Can be significantly increased.

なお、ここでは図示省略するが、PC基礎10がフーチング部18を有さない立上り部16だけで構成される場合、既存の技術として知られているように、各ベース部30間に跨がって所定の配筋材がスペーサ53を介して配置され、この配筋材上に立上り部16(PC基礎)が配置された後、打設コンクリートによってPC基礎が地盤100に固定されるようにしても良い。   Although not shown here, when the PC foundation 10 is composed only of the rising part 16 that does not have the footing part 18, the base part 30 straddles between the base parts 30 as is known in the art. A predetermined reinforcing material is arranged through the spacer 53, and after the rising portion 16 (PC foundation) is arranged on the reinforcing material, the PC foundation is fixed to the ground 100 by placing concrete. Also good.

このように、フーチング部18が立上り部16と別体で成形される場合、当該立上り部16の下端部には、上記テーパ17に替えて、図16に示すような下方に向けた切欠状の窪みからなるシアーキー80が形成されていることが好ましい。このシアーキー80は、PC基礎10の下端側における両側面にそれぞれ長手方向に沿って設けられることが好ましい。これにより、コンクリート4を打設して硬化させることでフーチング部18(すなわち、PC基礎10)を地盤100に固定した後、当該立上り部16(すなわち、PC基礎10)に鉛直方向下方への力が作用した場合においても、かかるシアーキー80によって打設コンクリート4に対する引っ掛かりができるため、剪断力に対する抵抗力が増す効果が期待できる。   Thus, when the footing part 18 is formed separately from the rising part 16, the lower end part of the rising part 16 has a notch-like shape directed downward as shown in FIG. 16 instead of the taper 17. It is preferable that a shear key 80 made of a depression is formed. The shear key 80 is preferably provided along the longitudinal direction on both side surfaces on the lower end side of the PC foundation 10. Thereby, after the footing part 18 (namely, PC foundation 10) is fixed to the ground 100 by placing and hardening the concrete 4, the downward force in the vertical direction is applied to the rising part 16 (namely, the PC foundation 10). Even in the case of the action of the shear key 80, the shear key 80 can catch the cast concrete 4, so that an effect of increasing the resistance to the shearing force can be expected.

次に、所定間隔で設置されたベース部30…間に各々PC基礎10を架設して連続した状態とする。このとき、PC基礎10,10同士が直線状に接合される部位(すなわち、上記I形接合のI−1タイプなど)に位置するベース部30においては、図17に示すように、連結部11,11が配置される。そして、これらの対向する開口11a,11aによって形成された空間内には、上方から接合筋3がインサートされる。なお、図17は、連結部11,11同士の接合に関する説明に用いる図であるため、当該接合に直接的に関係のないフーチング部18等については図示を割愛している。   Next, the PC foundations 10 are erected between the base portions 30... Installed at predetermined intervals to be in a continuous state. At this time, in the base portion 30 located at a portion where the PC foundations 10 and 10 are joined in a straight line (that is, the I-1 type of the above-described I-shaped joint), as shown in FIG. , 11 are arranged. And the joining bar | burr 3 is inserted from the upper direction in the space formed by these opening 11a, 11a which opposes. In addition, since FIG. 17 is a figure used for the description regarding joining of the connection parts 11 and 11, the footing part 18 etc. which are not directly related to the said joining are omitted in illustration.

そして、本実施形態の場合、このように接合筋3が挿入配置された状態において、各連結部11の各貫通孔34…にはボルト33aが挿通され、対向配置される穴35に設置されるナット(不図示)と螺合することで上述した所定位置に貫通手段33が配設される(図6参照)。   And in the case of this embodiment, in the state in which the joining bars 3 are inserted and arranged in this way, the bolts 33a are inserted into the respective through holes 34 of the respective connecting portions 11 and are installed in the holes 35 arranged to face each other. The penetration means 33 is arrange | positioned in the predetermined position mentioned above by screwing with a nut (not shown) (refer FIG. 6).

次いで、この状態において、図18に示すように、対向配置された連結部11,11間に接合金物54を取り付けることで、これらPC基礎10,10を仮固定し、部材倒れの矯正や作業中の倒壊を未然に防止する。これと共に、ベース部30の周辺に型枠52(ダンプレート捨て型枠など)をセットし、残土55と鉄筋棒56とによって、当該型枠52をベース部30の周辺に保持する。このとき、当該ベース部30の周囲(すなわち、型枠52が設けられたベース部30と、これに隣接するフーチング部18端部の支持部18aとで囲まれた範囲)のみ、先にコンクリートを打設しても良い。   Next, in this state, as shown in FIG. 18, the PC bases 10, 10 are temporarily fixed by attaching the joint hardware 54 between the coupling parts 11, 11 arranged to face each other, and during the correction of the member collapse or during the work To prevent the collapse of. At the same time, a mold frame 52 (such as a dumper throwing mold frame) is set around the base portion 30, and the mold frame 52 is held around the base portion 30 by the remaining soil 55 and the reinforcing bar 56. At this time, only the periphery of the base portion 30 (that is, the range surrounded by the base portion 30 provided with the mold 52 and the support portion 18a at the end portion of the footing portion 18 adjacent thereto) is first coated with concrete. You may cast it.

また、PC基礎10,10同士が直角状に接合される部位(特に、上記L形接合など)であって、出隅の頂部に位置するベース部30においては、図1に示すように、連結部11と突出部13とが配置される。このとき、突出部13内に一方の端部側が埋設された接合筋(不図示)の他方の端部側が、対向配置された連結部11の開口11a内に側方から挿入配置される。そして、上述の対向配置された連結部11,11の場合と同様に、突出部13と対向配置される連結部11の所定位置にも貫通手段33が配設される。
なお、ここでは図示省略するが、この場合も上述した図18の場合と同様に、対向配置された連結部11および突出部13間に接合金物54を取り付けることで仮固定すると共に、ダンプレート捨て型枠53をベース部30の周辺に取り付けて保持する。このときも上述のように、ベース部30の周囲のみ、先にコンクリートを打設しても良い。
Moreover, in the base part 30 which is the site | part (especially said L-shaped joining etc.) where the PC foundations 10 and 10 are joined at right angle, and located in the top part of a protrusion corner, as shown in FIG. The part 11 and the protruding part 13 are arranged. At this time, the other end side of the joining bar (not shown) in which one end side is embedded in the protruding portion 13 is inserted and arranged from the side into the opening 11a of the coupling portion 11 arranged oppositely. And the penetration means 33 is arrange | positioned also at the predetermined position of the connection part 11 arrange | positioned facing the protrusion part 13 similarly to the case of the connection parts 11 and 11 arranged oppositely.
Although not shown here, in this case as well, in the same manner as in FIG. 18 described above, the joint metal 54 is temporarily fixed between the connecting portion 11 and the protruding portion 13 that are arranged to face each other, and the dump plate is discarded. The mold 53 is attached and held around the base portion 30. Also at this time, as described above, concrete may be placed first only around the base portion 30.

また、上述の出隅の頂部に位置するベース部30においては、突出部13を有するPC基礎14を出隅位置に設置した状態で、突出部13の外面角部13aにより、出隅の角部が設定されることとなる(図1参照)。そのため、この出隅の角部が設定された状態で、外面角部13aを基準としてPC基礎10(12,14)の対角寸法を測定し、設計寸法に対し誤差がある場合には、その誤差調整を行なうことが可能となっている。このとき、PC基礎10(12,14)は、仮置きされているだけであり、誤差調整を容易かつ短時間で実行できるため、工期の短縮化やコスト削減を図ることができる。   Moreover, in the base part 30 located in the top part of the above-mentioned protrusion corner, the corner | angular part of the protrusion corner is carried out by the outer surface corner | angular part 13a of the protrusion part 13 in the state which installed the PC foundation 14 which has the protrusion part 13 in the protrusion corner position. Is set (see FIG. 1). Therefore, the diagonal dimension of the PC foundation 10 (12, 14) is measured on the basis of the outer corner 13a in the state where the corner of the protruding corner is set, and if there is an error with respect to the design dimension, Error adjustment can be performed. At this time, the PC foundation 10 (12, 14) is merely temporarily placed, and the error adjustment can be performed easily and in a short time, so that the construction period can be shortened and the cost can be reduced.

次に、図19(a)および(b)に示すように、ベース部30,30の周囲に設けた型枠52,52間のフーチング部18の周囲、すなわち、各支持部18aの隣接する端部同士を繋ぐように型枠52を配設し、コンクリート4をフーチング部18の天端以上となるように打設する(なお、図19(a)では、便宜上、フーチング部18の周囲に配設される型枠52を図示省略している)。   Next, as shown in FIGS. 19A and 19B, the periphery of the footing portion 18 between the molds 52, 52 provided around the base portions 30, 30, that is, the adjacent ends of the support portions 18a. The mold 52 is disposed so as to connect the parts, and the concrete 4 is placed so as to be equal to or higher than the top end of the footing part 18 (in FIG. 19A, for convenience, it is arranged around the footing part 18. The form 52 to be provided is not shown).

このとき、図20(a)に示すように、フーチング部18の端部側のコンクリート充填口19以外に、各支持部18a間の間隔K(図6参照)の周囲においても、各支持部18aの長さ方向両端側に型枠52が配設されるため、コンクリート充填口19が形成される。この場合、上記間隔Kに配設された補助配筋材23の長さは、型枠52,52間の間隔と略等しく設定されている。なお、この補助配筋材23の長さを各支持部18aの長さより長く設定し、その両端側に型枠52を配設することで、フーチング部18の幅方向の寸法も調整可能となる。
そして、これらコンクリート充填口19からコンクリート4を打設すると、このコンクリート充填口19が立上り部16の下の空間と連通しているので、この空間にコンクリート4が流れ込む。さらに、立上り部16の下端部には、テーパ17が形成されているので、一方の側からコンクリート4を打設すると、このコンクリート4は他方の側に流れ込み易くなっている。
At this time, as shown in FIG. 20A, in addition to the concrete filling port 19 on the end side of the footing portion 18, the support portions 18a are also provided around the interval K between the support portions 18a (see FIG. 6). Since the formwork 52 is disposed at both ends in the length direction, the concrete filling port 19 is formed. In this case, the length of the auxiliary reinforcing material 23 arranged at the interval K is set substantially equal to the interval between the molds 52 and 52. In addition, by setting the length of the auxiliary bar arrangement material 23 to be longer than the length of each support portion 18a and disposing the mold frames 52 at both ends thereof, the dimension in the width direction of the footing portion 18 can be adjusted. .
When the concrete 4 is placed from these concrete filling ports 19, the concrete filling port 19 communicates with the space below the rising portion 16, and the concrete 4 flows into this space. Furthermore, since the taper 17 is formed in the lower end part of the rising part 16, when the concrete 4 is driven from one side, this concrete 4 will be easy to flow into the other side.

すなわち、コンクリート充填口19からコンクリート4を打設すると、立上り部16のテーパ17によって、当該コンクリート4が反対側に流れ易くなるので、一方側からのコンクリート打設だけでPC基礎10を固定でき、立上り部16の他方側の側面を汚さずに済むこととなる。また、テーパ17を設ける分、PC基礎10の軽量化を図ることができるため、施工に使用するクレーン等の重機を小型化できるなど施工性にも優れている。   That is, when the concrete 4 is placed from the concrete filling port 19, the concrete 4 easily flows to the opposite side by the taper 17 of the rising portion 16, so that the PC foundation 10 can be fixed only by placing the concrete from one side, The side surface on the other side of the rising portion 16 does not have to be stained. Moreover, since the weight of the PC foundation 10 can be reduced by providing the taper 17, it is excellent in workability such that a heavy machine such as a crane used for construction can be reduced in size.

従って、例えば建物の内側からコンクリートを打設すれば、外側にもコンクリートが流れ込むこととなり、外側からのコンクリート打設作業を省略できるため、立上り部16における建物の外側面が打設コンクリートによって汚されることがなくなる。   Therefore, for example, if concrete is poured from the inside of the building, the concrete flows into the outside, and the concrete placing work from the outside can be omitted. Therefore, the outside surface of the building at the rising portion 16 is soiled by the cast concrete. Nothing will happen.

さらに、打設されたコンクリートは、フーチング部18の下にも流れ込むので、PC基礎10が確実に地盤に固定される。なお、フーチング18の下からコンクリートが流れ出すのを見て、コンクリートの打設が適切に行われたか否かを判断することもできる。   Furthermore, since the poured concrete flows under the footing part 18, the PC foundation 10 is reliably fixed to the ground. It can also be determined whether or not the concrete has been properly placed by seeing the concrete flowing out from under the footing 18.

また、ベース部30の周辺では、図20(b)に示すように、例えばベース部30のPC底盤22上に、立上り部16の端部底面が載置された状態を保持してコンクリート4が打設され固定されている。このように、打設されたコンクリート4は、コテ49等で平坦にならして表面処理した後、養生する。   In addition, as shown in FIG. 20B, the concrete 4 is placed around the base portion 30 while maintaining the state where the bottom surface of the rising portion 16 is placed on the PC bottom plate 22 of the base portion 30, for example. It is cast and fixed. In this way, the placed concrete 4 is cured after being leveled with a trowel 49 or the like and subjected to surface treatment.

なお、本実施形態の場合、PC基礎10(12,14)は、立上り部16とフーチング部18とが一体的に成形されて構成されているので、建築現場でフーチング全体を構築する必要がない。つまり、建築現場でフーチング部を形成する手間を省くことができる分、工期の短縮化やコスト削減を図ることができると共に、コンクリート4の打設作業を行えば、フーチング部18を地盤100に固定できる。   In the case of the present embodiment, the PC foundation 10 (12, 14) is formed by integrally forming the rising portion 16 and the footing portion 18, so that it is not necessary to construct the entire footing at the construction site. . In other words, it is possible to reduce the work period and cost by the amount of time and effort required to form the footing part at the construction site, and to fix the footing part 18 to the ground 100 when the concrete 4 is placed. it can.

続いて、図21に示すように、各種接合のパターンで配置された連結部11の開口11a内にもコンクリート4を打設する。なお、ここでは、I形接合のI−1タイプで、対向配置された連結部11,11の開口11a,11aによって形成される空間内にコンクリート4を打設している状態を示している。このとき、PC基礎10の立上り部16における上端面におけるアンカーボルト61(後述する図22参照)の設置部位には、当該アンカーボルト61を配設するためのインサート部が設けられており、打設コンクリート4が万が一、はねたり、こぼれたりして塞ぐことのないように、当該インサート部をガムテープ60等によって養生しておく。   Subsequently, as shown in FIG. 21, the concrete 4 is also placed in the openings 11 a of the connecting portions 11 arranged in various joining patterns. Here, a state in which the concrete 4 is placed in a space formed by the openings 11a and 11a of the coupling portions 11 and 11 that are opposed to each other is an I-type I-1 type joint is illustrated. At this time, an insertion portion for disposing the anchor bolt 61 is provided at an installation site of the anchor bolt 61 (see FIG. 22 described later) on the upper end surface of the rising portion 16 of the PC foundation 10. The insert part is cured with a gummed tape 60 or the like so that the concrete 4 should not be blocked by splashing or spilling.

そして、コンクリート4の打設作業が終了したら、図22に示すように上記インサート部にアンカーボルト61を配設し、コンクリート4が固化した後、型枠52を取り外す。このようにして、各種PC基礎10(12,14)が根切り部20に連続的に配置され、接合(連結)されることにより、布基礎1が構築される。   Then, when the concrete 4 is placed, the anchor bolts 61 are disposed in the insert portion as shown in FIG. 22, and after the concrete 4 is solidified, the mold 52 is removed. In this way, the fabric foundation 1 is constructed by continuously arranging and joining (connecting) the various PC foundations 10 (12, 14) to the root cutting portion 20.

以上、説明したように、本実施形態のPC基礎10によって構築される布基礎1の施工方法によれば、PC基礎10(12,14)の連結部11に配設される接合筋3が、連結部11の開口11a内における垂直方向の上下に離間した位置に配置され、各々水平方向に延在する一対の横配筋31,31と、これら一対の横配筋31,31間に配置され、当該横配筋31,31同士を垂直方向に連結する縦配筋32と、を有している。また、PC基礎10(12,14)は、連結部11に接合筋3を配置した後、当該接合筋3のうち、少なくとも一対の横配筋31,31間における上方側であって、当該上方側の横配筋31における水平方向の両端部間の位置に、開口11aを含む平面コ字形状の連結部11に対して当該連結部11の厚み方向に貫通する貫通手段33を配設するようにした。従って、連結部11に接合筋3を配置してから当該連結部11に貫通手段33を配設することができるため、PC基礎10(12,14)の連結部11に対して連結強度の強化を図る接合筋3を配置することが容易となる。   As described above, according to the construction method of the fabric foundation 1 constructed by the PC foundation 10 of the present embodiment, the joining bars 3 arranged in the connecting portion 11 of the PC foundation 10 (12, 14) are: A pair of lateral reinforcement bars 31 and 31 are arranged at positions vertically spaced in the opening 11a of the connecting portion 11 and extend in the horizontal direction, and are arranged between the pair of lateral reinforcement bars 31 and 31. , And the vertical bar 32 that connects the horizontal bars 31 and 31 in the vertical direction. Further, the PC foundation 10 (12, 14) is arranged on the upper side between at least a pair of laterally arranged bars 31 and 31 of the joint bar 3 after the joint bar 3 is arranged in the connecting portion 11, and the upper side. A penetrating means 33 penetrating in the thickness direction of the connecting portion 11 is arranged at a position between both ends in the horizontal direction of the lateral bar 31 on the side with respect to the connecting portion 11 having a planar U shape including the opening 11a. I made it. Therefore, since the penetration means 33 can be arrange | positioned in the said connection part 11 after arrange | positioning the joining bar | burr 3 in the connection part 11, reinforcement | strengthening of connection strength with respect to the connection part 11 of PC foundation 10 (12,14). It becomes easy to arrange the joining bars 3 for achieving the above.

このとき、連結部11はPC基礎10(12,14)の長手方向の外方に向けた開口11aを有することによって平面コ字形状に成形されている。つまり、連結部11は従来と比して開口11aが平面コ字形状に一体で成形されている。従って、連結部11が第1部材と第2部材とをボルト締結するように別体成形された従来品と比較して部品点数を低減でき、コストを抑えることができる。しかも、一体成形されている分、ボルト締結するための作業工数も削減できる。   At this time, the connecting portion 11 is formed into a planar U-shape by having an opening 11a facing outward in the longitudinal direction of the PC foundation 10 (12, 14). That is, the connecting part 11 has an opening 11a integrally formed in a U-shaped plane as compared with the conventional case. Accordingly, the number of parts can be reduced and the cost can be reduced as compared with a conventional product in which the connecting portion 11 is separately molded so that the first member and the second member are bolted together. In addition, the number of work steps for fastening the bolts can be reduced by the integral molding.

また、PC基礎10(12,14)は開口を含む平面コ字形状の連結部11に対し、当該連結部11の厚み方向に貫通される貫通手段33を備えているので、連結部11の開口11a内にコンクリート4を打設することによって、当該開口11aの厚み方向に生じる剪断応力に対して効果的な補強を図ることができる。
かくして、本実施形態によれば、コスト増を招くことなく、PC基礎10,10同士の連結強度を容易に強化できる。
Further, since the PC base 10 (12, 14) includes a penetrating means 33 penetrating in the thickness direction of the connecting portion 11 with respect to the connecting portion 11 having a planar U shape including the opening, the opening of the connecting portion 11 is provided. By placing the concrete 4 in the 11a, it is possible to effectively reinforce the shear stress generated in the thickness direction of the opening 11a.
Thus, according to the present embodiment, the connection strength between the PC foundations 10 and 10 can be easily enhanced without causing an increase in cost.

また、本実施形態による布基礎1の施工方法によれば、フーチング部18は、立上り部16の長手方向に任意に調整可能な間隔Kを空けて配置され、かつ互いに平行する複数の支持部18a…と、立上り部16と平行に配置され、かつ複数の支持部18a…の端部同士を連結する補強材としての補助配筋材18bと、を備えている。このとき、複数の支持部18a…間に形成された間隔Kは、現場打ちコンクリート4の打設用スペースとされているので、当該間隔Kにコンクリート4を打設してフーチング部18を地盤100に強固に固定できる。
しかも、複数の支持部18a…間に形成された間隔Kは、任意に調整可能であるので、例えば標準とは異なる仕様等の間取りで建物用基礎である布基礎1を構築するような、規定寸法と比較して変更された寸法のPC基礎10(12,14)が必要となった場合においても、当該変更された寸法に対応することができるため、歩留まりを改善してコストを抑えることができる。
加えて、PC基礎10(12,14)は、立上り部16とフーチング部18とを有する形状に工場で製造されるものであり、表面が仕上げ処理されているため、特に、立上り部16は、建築現場で表面処理を行なう必要がない。また、表面のデザイン加工も可能である。
Moreover, according to the construction method of the fabric foundation 1 by this embodiment, the footing part 18 is arrange | positioned at the space | interval K which can be adjusted arbitrarily in the longitudinal direction of the rising part 16, and is the some support part 18a parallel to each other. ... and auxiliary reinforcing material 18b as a reinforcing material that is arranged in parallel to the rising part 16 and connects the ends of the plurality of support parts 18a. At this time, since the interval K formed between the plurality of support portions 18a is a space for placing the on-site cast concrete 4, the concrete 4 is placed at the interval K and the footing portion 18 is placed on the ground 100. Can be fixed firmly.
In addition, since the interval K formed between the plurality of support portions 18a can be arbitrarily adjusted, for example, a rule that constructs the fabric foundation 1 as a building foundation with a layout different from the standard, etc. Even when the PC foundation 10 (12, 14) having a changed size compared to the size is required, the changed size can be dealt with, so that the yield can be improved and the cost can be reduced. it can.
In addition, the PC foundation 10 (12, 14) is manufactured in a factory in a shape having a rising part 16 and a footing part 18, and since the surface is finished, in particular, the rising part 16 There is no need for surface treatment at the construction site. In addition, surface design processing is also possible.

さらに、フーチング部18は、隣接する複数の支持部18a,18a間に、これら支持部18a…と平行して配置される配筋材23を備えているので、PC基礎10(12,14)の剛性や強度を向上させることができる。
このとき、配筋材23の長さが、支持部18a…よりも長尺に設定されていれば、PC基礎10(12,14)の剛性や強度を向上させることができる上に、フーチング部18における幅方向の寸法変更にも対応できる。
Furthermore, since the footing part 18 is provided with the reinforcing material 23 arrange | positioned in parallel with these support part 18a ... between the some support parts 18a and 18a adjacent, the PC foundation 10 (12, 14) is equipped. Stiffness and strength can be improved.
At this time, if the length of the reinforcing bar 23 is set to be longer than the support portion 18a, the rigidity and strength of the PC foundation 10 (12, 14) can be improved, and the footing portion It is possible to cope with a change in dimension in the width direction in FIG.

また、複数の支持部18a…の長さ方向両端部側に、現場打ちコンクリート4の打設時に使用される型枠52,52がそれぞれ配置されており、配筋材23の長さは、型枠52,52間の間隔と略等しく設定されているので、フーチング部18の周辺を囲むように配置された型枠52,52内に現場打ちコンクリート4を打設することにより、コンクリート4の打設量を少なくして打設作業を容易にでき、且つ型枠52が打設したコンクリート4を囲むため、養生期間中の他の作業も影響を受けることなく行なうことができ、工期の短縮およびコスト削減を図ることができる。   Further, mold frames 52 and 52 used for placing the cast-in-place concrete 4 are respectively disposed on both ends of the plurality of support portions 18a in the length direction. Since the distance between the frames 52 and 52 is set to be approximately equal to the distance between the frames 52 and 52, the concrete 4 is cast by placing the cast-in-place concrete 4 in the molds 52 and 52 arranged so as to surround the periphery of the footing portion 18. Since the placing work can be reduced and the placing work can be facilitated, and the concrete 52 surrounded by the formwork 52, other work during the curing period can be performed without being affected, and the construction period can be shortened. Cost reduction can be achieved.

さらに、立上り部16の下端部はテーパ状に形成されており、複数の支持部18a…の上端部には、立上り部16の下端部のテーパ17に対応する溝部18eがそれぞれ形成されており、立上り部16のテーパ17は、複数の支持部18a…の各溝部18e…に嵌合されているので、立上り部16の下端部と、地盤100との間に所定空間を形成することができる。よって、この所定空間に打設したコンクリート4を流れ込ますことができ、フーチング部18を地盤100に対して、より一層強固に固定できることとなる。すなわち、PC基礎10(12,14)の固定強度を最大限に発揮させることができる。
しかも、立上り部16の下端部には、テーパ17が形成されているので、一方の側から打設したコンクリート4を他方の側に流れ込み易くすることができる。従って、例えば、建物の内側からコンクリート4を打設すれば、外側にもコンクリート4が流れ込むこととなり、外側からのコンクリート打設作業を省略できる。これにより、立上り部16における建物の外側面が打設したコンクリート4によって汚されることを未然に防止できる。
Furthermore, the lower end part of the rising part 16 is formed in a taper shape, and the groove part 18e corresponding to the taper 17 at the lower end part of the rising part 16 is formed at the upper end part of the plurality of support parts 18a. Since the taper 17 of the rising portion 16 is fitted in each groove portion 18e of the plurality of support portions 18a, a predetermined space can be formed between the lower end portion of the rising portion 16 and the ground 100. Therefore, the concrete 4 placed in the predetermined space can be poured, and the footing portion 18 can be fixed to the ground 100 more firmly. That is, the fixing strength of the PC foundation 10 (12, 14) can be maximized.
And since the taper 17 is formed in the lower end part of the standing part 16, the concrete 4 laid from one side can be made easy to flow into the other side. Therefore, for example, when the concrete 4 is placed from the inside of the building, the concrete 4 flows into the outside, and the concrete placing work from the outside can be omitted. Thereby, it can prevent in advance that the outer surface of the building in the rising part 16 is soiled by the concrete 4 laid.

なお、本発明は、上述した実施形態に限定されることなく、本発明の趣旨を逸脱しない範囲において、適宜、種々の改良および設計の変更が可能である。   The present invention is not limited to the above-described embodiments, and various improvements and design changes can be made as appropriate without departing from the spirit of the present invention.

例えば、上述した実施形態においては、接合筋3が上下一対の横配筋31,31と、これら一対の横配筋31,31間に設けられ、これら横配筋31,31同士を連結する一対の縦配筋32,32とによって構成する場合について図示して説明したが、本発明はこれに限られることはない。すなわち、接合筋3において、縦配筋32は横配筋31,31間に設けられていれば、1本であっても一対であっても、またはそれ以上設けられていても良い。   For example, in the above-described embodiment, the joining bar 3 is provided between the pair of upper and lower horizontal bars 31, 31 and the pair of horizontal bars 31, 31, and the pair of the horizontal bars 31, 31 are connected to each other. Although the case where it is constituted by the vertical bar arrangements 32, 32 has been illustrated and described, the present invention is not limited to this. That is, in the joining bar 3, as long as the vertical bar 32 is provided between the horizontal bars 31, 31, it may be one, a pair, or more.

また、建物用基礎部材であるPC基礎10(12,14)の立上り部16と、フーチング部18とは、一体に成形されず、フーチング部を現場打ちコンクリートによって形成するようにしても良い。   Further, the rising portion 16 and the footing portion 18 of the PC foundation 10 (12, 14), which is a building foundation member, may not be integrally formed, and the footing portion may be formed of cast-in-place concrete.

1…布基礎(建物用基礎構造)
10,12,14…PC基礎(建物用基礎部材)
11…連結部
11a…開口
13…突出部
16…立上り部
17…テーパ
18…フーチング部
18a…支持部
18b…補助配筋材(補強材)
18c…囲繞部
18e…溝部
19…コンクリート充填口
20…根切り部
21…敷きモルタル
22…PC底盤
23…配筋材
24a…凸部
24b…底面部
25a…天面
25b,25c…傾斜部
30…ベース部
3…接合筋(接合用の配筋材)
31…横配筋
31a…引掛部
32…縦配筋
33…貫通手段
33a…ボルト
34…貫通孔
35…穴
4…コンクリート
52…型枠
1 ... Cloth foundation (building foundation structure)
10, 12, 14 ... PC foundation (building foundation)
DESCRIPTION OF SYMBOLS 11 ... Connection part 11a ... Opening 13 ... Protrusion part 16 ... Rising part 17 ... Taper 18 ... Footing part 18a ... Support part 18b ... Auxiliary reinforcement material (reinforcement material)
18c ... Surrounding part 18e ... Groove part 19 ... Concrete filling port 20 ... Root cutting part 21 ... Laying mortar 22 ... PC bottom board 23 ... Reinforcement material 24a ... Convex part 24b ... Bottom part 25a ... Top face 25b, 25c ... Inclined part 30 ... Base part 3 ... Joining bars (reinforcing bars)
31 ... Horizontal reinforcement 31a ... Hook 32 ... Vertical reinforcement 33 ... Penetration means 33a ... Bolt 34 ... Through hole 35 ... Hole 4 ... Concrete 52 ... Formwork

Claims (6)

建物の構築領域で地盤を連続的に掘削して根切り部を形成し、この根切り部に長手方向の端部が連結部とされたプレキャストコンクリート製の建物用基礎部材を順次配列し、これら隣接する建物用基礎部材同士を接合用の配筋材によって連結する建物用基礎の施工方法において、
前記連結部は、前記建物用基礎部材の長手方向の外方に向けた開口を有することによって平面コ字形状に成形されてなり、
前記接続用の配筋材は、
前記連結部の開口内における垂直方向の上下に離間した位置に配置され、各々水平方向に延在する一対の横配筋と、
これら一対の横配筋間に配置され、当該横配筋同士を垂直方向に連結する縦配筋と、を有しており、
前記順次配列された建物用基礎部材の前記連結部の開口内に前記接合用の配筋材を配置し、
前記連結部の開口内に配置された前記接合用の配筋材のうち、少なくとも前記一対の横配筋間における上方側であって、当該上方側の横配筋における前記水平方向の両端部間の位置に、前記開口を含む平面コ字形状の連結部に対して当該連結部の厚み方向に貫通する貫通手段を配設して、
前記接合用の配筋材が配置された前記連結部の開口内にコンクリートを打設することを特徴とする建物用基礎の施工方法。
In the building construction area, the ground is continuously excavated to form root cuts, and precast concrete building foundation members with longitudinal ends connected to the root cuts are sequentially arranged. In the building foundation construction method for connecting adjacent building foundation members together with the reinforcing bar for joining,
The connecting portion is formed into a planar U shape by having an opening directed outward in the longitudinal direction of the building foundation member,
The connecting reinforcing bars are:
A pair of lateral bars arranged at positions spaced vertically above and below in the opening of the connecting portion, each extending in the horizontal direction;
It is arranged between these pair of horizontal bars, and has vertical bars that connect the horizontal bars in the vertical direction.
Arranging the reinforcing bars for joining in the openings of the connecting portions of the building foundation members arranged in sequence,
Among the bar arrangement materials for joining arranged in the opening of the connecting part, at least the upper side between the pair of horizontal bar arrangements, and between the horizontal ends of the upper side bar arrangements The penetrating means penetrating in the thickness direction of the connecting portion with respect to the planar U-shaped connecting portion including the opening is disposed at the position,
A construction method for a foundation for a building, wherein concrete is placed in an opening of the connecting portion in which the reinforcing bar for bonding is arranged.
請求項1に記載の建物用基礎の施工方法において、
前記接合用の配筋材は、少なくとも前記上方側の横配筋における前記連結部の開口内に位置する端部が、前記縦配筋側に向けて曲折されてなる引掛部とされており、
前記連結部に前記貫通手段を配設する際、前記引掛部近傍に配設することを特徴とする建物用基礎の施工方法。
In the construction method of the foundation for buildings of Claim 1,
The joining bar arrangement material is at least a hook part formed by bending an end part located in the opening of the connecting part in the upper side bar arrangement toward the vertical bar arrangement side,
A construction method for a building foundation, characterized in that, when the penetrating means is disposed in the connecting portion, it is disposed in the vicinity of the hooking portion.
請求項1または2に記載の建物用基礎の施工方法において、
前記連結部に前記貫通手段を配設する際、前記連結部に配置された前記接合用の配筋材のうち、前記一対の横配筋間における上方側および下方側の各横配筋における前記水平方向の両端部間にそれぞれ配設することを特徴とする建物用基礎の施工方法。
In the construction method of the foundation for buildings of Claim 1 or 2,
When disposing the penetrating means in the connecting portion, among the connecting reinforcing bars arranged in the connecting portion, the upper and lower lateral reinforcing bars between the pair of horizontal reinforcing bars A construction method for a foundation for a building, characterized in that it is disposed between both ends in a horizontal direction.
請求項3に記載の建物用基礎の施工方法において、
前記接合用の配筋材は、前記上方側および下方側の横配筋における前記連結部の開口内に位置する端部が、それぞれ前記縦配筋側に向けて曲折されてなる引掛部とされており、
前記連結部に前記貫通手段を配設する際、前記上方側および下方側の各引掛部近傍にそれぞれ配設することを特徴とする建物用基礎の施工方法。
In the construction method of the foundation for buildings of Claim 3,
The joining bar arrangement material is a hook portion in which the end portions located in the opening of the connecting portion in the upper and lower side bar arrangements are respectively bent toward the vertical reinforcement side. And
A construction method for a building foundation, characterized in that, when the penetrating means is disposed in the connecting portion, it is disposed in the vicinity of each of the upper and lower hooking portions.
請求項1〜4のいずれか一項に記載の建物用基礎の施工方法において、
前記連結部の開口内に配置された前記接合用の配筋材の一方の端部に対して反対側となる他方の端部が、当該連結部に隣接する他の基礎部材に埋設されていることを特徴とする建物用基礎の施工方法。
In the construction method of the foundation for buildings as described in any one of Claims 1-4,
The other end which is opposite to the one end of the joining reinforcing bar disposed in the opening of the connecting portion is embedded in another base member adjacent to the connecting portion. The construction method of the foundation for buildings characterized by this.
請求項1〜5のいずれか一項に記載の建物用基礎の施工方法において、
前記縦配筋が、前記一対の横配筋間の前記水平方向における所定の離間した位置に一対で配置されており、
前記連結部に前記貫通手段を配設する際、少なくとも前記一対の縦配筋間に配設することを特徴とする建物用基礎の施工方法。
In the construction method of the foundation for buildings as described in any one of Claims 1-5,
The vertical reinforcing bars are arranged in a pair at a predetermined spaced position in the horizontal direction between the pair of horizontal reinforcing bars,
A construction method for a foundation for a building, characterized in that when the penetrating means is disposed in the connecting portion, it is disposed at least between the pair of vertical bars.
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JPH07233534A (en) * 1993-12-29 1995-09-05 Misawa Homes Co Ltd Precast concrete foundation construction, precast concrete foundation, and construction method for foundation
JPH09158203A (en) * 1995-12-01 1997-06-17 Misawa Homes Co Ltd Precast concrete foundation, its coupling structure, and form for manufacturing precast concrete foundation
JPH09217359A (en) * 1996-02-13 1997-08-19 Misawa Homes Co Ltd Precast concrete foundation, its connecting structure, and form for manufacturing precast concrete foundation
US20030033773A1 (en) * 2001-05-23 2003-02-20 Glenn Houpapa Foundation construction
JP2002364000A (en) * 2001-06-12 2002-12-18 Misawa Homes Co Ltd Precast foundation

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