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JP2023011057A - Foundation structure and foundation construction method - Google Patents

Foundation structure and foundation construction method Download PDF

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JP2023011057A
JP2023011057A JP2022189547A JP2022189547A JP2023011057A JP 2023011057 A JP2023011057 A JP 2023011057A JP 2022189547 A JP2022189547 A JP 2022189547A JP 2022189547 A JP2022189547 A JP 2022189547A JP 2023011057 A JP2023011057 A JP 2023011057A
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foundation
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embedded
floor slab
concrete floor
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JP7532737B2 (en
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慶一 平井
Keiichi Hirai
啓祐 鈴木
Keisuke Suzuki
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Takenaka Komuten Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To increase the shear resistance of a foundation to the ground.
SOLUTION: Foundation structure has a concrete floor slab (pressure-resistant slab 25) provided on the ground, a footing beam projecting upwards from the concrete floor slab, an embedded portion 12XE which is formed in a part of the footing beam, protrudes downward from the concrete floor slab and is embedded into the ground, a stirrup 34 arranged from an upper end of the footing beam to a lower end of the embedded portion 12XE, and a bending reinforcing bar 36 provided in parallel along the stirrup 34 to resist bending deformation due to earth pressure between the stirrups 34 adjacent to each other in the range from the central portion of the footing beam to the lower end of the embedded portion 12XE.
SELECTED DRAWING: Figure 3
COPYRIGHT: (C)2023,JPO&INPIT

Description

本発明は、基礎構造及び基礎構築方法に関する。 The present invention relates to foundation structures and foundation construction methods.

下記特許文献１には、基礎梁の下部に柱下杭を設けた杭基礎構造が示されている。 Patent Literature 1 below shows a pile foundation structure in which post-column piles are provided below foundation beams.

特開２０１６－１９９８６１号公報JP 2016-199861 A

上記特許文献１の杭基礎構造では、地震時に杭が地盤に対してせん断抵抗力を発揮するが、地震力が大きくなると杭がせん断破壊する可能性がある。 In the pile foundation structure of Patent Document 1, the piles exhibit shear resistance against the ground during an earthquake, but when the seismic force increases, the piles may undergo shear failure.

本発明は上記事実を考慮して、地盤に対する基礎のせん断抵抗力を高めることを目的とする。 An object of the present invention is to increase the shear resistance of the foundation to the ground in consideration of the above facts.

請求項１の基礎構造は、地盤上に設けられたコンクリート床版と、前記コンクリート床版の上方へ突出する基礎梁と、前記基礎梁の一部に形成され、前記コンクリート床版の下方へ突出して前記地盤へ根入れされた根入れ部と、前記基礎梁の上端から前記根入れ部の下端まで配筋されたあばら筋と、を有する。 The foundation structure of claim 1 comprises a concrete floor slab provided on the ground, a foundation beam projecting upward from the concrete floor slab, and a part of the foundation beam formed on the foundation beam and projecting downward from the concrete floor slab. and a stirrup arranged from the upper end of the foundation beam to the lower end of the embedded portion.

請求項１の基礎構造によると、基礎梁は、コンクリート床版の下方へ突出し地盤に根入れされた根入れ部を備えている。このため地震時に基礎梁が地盤に対して動こうとすると、根入れ部が地盤から土のせん断抵抗力を受ける。このため、基礎梁に根入れ部がない構成と比較して、基礎の地盤に対するせん断抵抗力を高めることができる。これにより基礎梁が地盤に対して水平変位し難くなる。 According to the foundation structure of claim 1, the foundation beam is provided with an embedded part that protrudes downward from the concrete floor slab and is embedded in the ground. For this reason, when the foundation beam tries to move against the ground during an earthquake, the embedded part receives the shear resistance force of the soil from the ground. Therefore, the shear resistance of the foundation to the ground can be increased compared to a configuration in which the foundation beam does not have an embedded portion. This makes it difficult for the foundation beam to be horizontally displaced with respect to the ground.

一態様の基礎構造は、前記根入れ部には、土圧による曲げ変形に対して抵抗する曲げ補強筋が設けられている。 In one aspect of the foundation structure, the embedded portion is provided with a bending reinforcement that resists bending deformation due to earth pressure.

一態様の基礎構造によると、根入れ部に、土圧による曲げ変形に対して抵抗する曲げ補強筋が設けられている。このため根入れ部は、土圧に対して曲げ破壊し難い。
請求項２の基礎構造は、請求項１に記載の基礎構造において、前記基礎梁の中央部から前記根入れ部の下端部までの範囲において、互いに隣り合う前記あばら筋の間に、前記あばら筋に沿って平行に設けられ、土圧による曲げ変形に対して抵抗する曲げ補強筋を有する。
請求項３の基礎構造は、請求項１または２に記載の基礎構造において、前記基礎梁には支持杭が固定されている。
請求項４の基礎構造は、請求項３に記載の基礎構造において、前記支持杭として、前記基礎梁と一体化されたフーチングに杭頭部が固定され、支持地盤に下端部が固定された、長さが異なる複数の支持杭を備え、前記根入れ部は、複数の前記支持杭のうち、少なくとも長さが最も長い前記支持杭が固定された前記基礎梁に形成され、長さが最も短い前記支持杭が固定された前記基礎梁には形成されていない。 According to one aspect of the foundation structure, the embedded portion is provided with bending reinforcements that resist bending deformation due to earth pressure. For this reason, the embedded portion is less likely to bend and break against earth pressure.
In the foundation structure according to claim 2, in the foundation structure according to claim 1, the stirrups are placed between the adjacent stirrups in the range from the center portion of the foundation beam to the lower end portion of the embedded portion. It has bending reinforcing bars that are installed parallel to each other and resist bending deformation due to earth pressure.
The foundation structure according to claim 3 is the foundation structure according to claim 1 or 2, wherein supporting piles are fixed to the foundation beams.
The foundation structure according to claim 4 is the foundation structure according to claim 3, wherein as the supporting pile, the pile head is fixed to the footing integrated with the foundation beam, and the lower end is fixed to the supporting ground. A plurality of supporting piles having different lengths are provided, and the embedded portion is formed in the foundation beam to which at least the longest supporting pile among the plurality of supporting piles is fixed and has the shortest length. The support piles are not formed on the fixed foundation beams.

請求項５の基礎構築方法は、地盤を掘削して掘削溝を形成する工程と、前記掘削溝へ鉄筋を配筋する工程と、前記掘削溝及び前記掘削溝を形成した地盤面にコンクリートを打設して、コンクリート床版及び前記コンクリート床版の下方へ突出した根入れ部を形成する工程と、前記掘削溝の上方及び前記掘削溝が形成されていない前記コンクリート床版の上方へコンクリートを打設して、前記コンクリート床版の上方へ突出し、かつ、一部が前記地盤に根入れされた基礎梁を形成する工程と、を有し、前記鉄筋は、前記基礎梁の上端から前記根入れ部の下端まで配筋されたあばら筋である。 The foundation construction method according to claim 5 comprises the steps of excavating the ground to form an excavated trench, placing reinforcing bars in the excavated trench, and pouring concrete into the excavated trench and the ground surface in which the excavated trench is formed. a step of forming a concrete floor slab and an embedding portion protruding downward of the concrete floor slab; forming a base beam protruding upward from the concrete floor slab and partially embedded in the ground, wherein the reinforcing bar is embedded from the upper end of the base beam It is a stirrup that is arranged to the bottom end of the part.

請求項５の基礎梁構築方法によると、地盤に根入れされた基礎梁が構築される。このため地震時に基礎梁が地盤に対して動こうとすると、根入部が地盤から土のせん断抵抗力を受ける。このため、基礎梁が地盤に根入れされていない構成と比較して、基礎の地盤に対するせん断抵抗力を高めることができる。これにより基礎梁が地盤に対して水平変位し難くなる。 According to the foundation beam constructing method of claim 5, the foundation beam embedded in the ground is constructed. For this reason, when the foundation beam tries to move against the ground during an earthquake, the embedded section receives the shear resistance force of the soil from the ground. Therefore, the shear resistance of the foundation to the ground can be increased compared to a configuration in which the foundation beam is not embedded in the ground. This makes it difficult for the foundation beam to be horizontally displaced with respect to the ground.

本発明に係る基礎構造及び基礎構築方法によると、地盤に対する基礎のせん断抵抗力を高めることができる。 According to the foundation structure and foundation construction method according to the present invention, the shear resistance of the foundation to the ground can be increased.

本発明の実施形態に係る基礎構造が適用された建物を示す立断面図である。1 is an elevation cross-sectional view showing a building to which a foundation structure according to an embodiment of the present invention is applied; FIG. 本発明の実施形態に係る基礎構造が適用された基礎梁を示す基礎伏図である。1 is a foundation plan showing a foundation beam to which a foundation structure according to an embodiment of the present invention is applied; FIG. 本発明の実施形態に係る基礎構造を示す立断面図である。1 is an elevation cross-sectional view showing a basic structure according to an embodiment of the present invention; FIG. （Ａ）は本発明の実施形態に係る基礎構築方法において表層地盤を掘削した状態を示しており、（Ｂ）は梁型枠を構築した状態を示しており、（Ｃ）は掘削溝と梁型枠の間に埋め戻し材を埋め戻した状態を示している。(A) shows the state in which the surface ground is excavated in the foundation construction method according to the embodiment of the present invention, (B) shows the state in which the beam formwork is constructed, and (C) shows the excavated groove and the beam It shows a state in which the backfilling material is backfilled between the forms. （Ａ）は本発明の実施形態に係る基礎構築方法において基礎梁の梁鉄筋を配設した状態を示しており、（Ｂ）は耐圧版、基礎梁及びスラブのコンクリートを打設した状態を示している。(A) shows a state in which the beam reinforcing bars of the foundation beams are arranged in the foundation construction method according to the embodiment of the present invention, and (B) shows a state in which the pressure plate, the foundation beams and the slab concrete are placed. ing. 本発明の実施形態に係る基礎構造が適用された建物が、支持地盤の深さが略一定である敷地に建てられた変形例を示す立断面図である。FIG. 4 is an elevation cross-sectional view showing a modified example in which a building to which the foundation structure according to the embodiment of the present invention is applied is built on a site where the depth of supporting ground is substantially constant.

（建物）
本発明の実施形態に係る基礎構造が適用される建物１０は、図１に示すように、表層地盤Ｇ１の下方に、傾斜した支持地盤Ｇ２が形成された敷地に立つ構造物である。建物１０は、支持地盤Ｇ２が浅い位置（図１におけるＸ方向右側）では、基礎梁１２が支持地盤Ｇ２に直接載置されて支持された直接基礎形式とされている。 (building)
The building 10 to which the foundation structure according to the embodiment of the present invention is applied is, as shown in FIG. The building 10 has a direct foundation type in which the foundation beam 12 is directly placed on and supported by the support ground G2 at a position where the support ground G2 is shallow (the right side in the X direction in FIG. 1).

また、支持地盤Ｇ２が深い位置（図１におけるＸ方向左側。換言すると、基礎梁１２と支持地盤Ｇ２とが上下方向に離間している位置）では、基礎梁１２の下端部から支持杭２０を支持地盤Ｇ２へ延設して支持された杭基礎形式とされている。なお、以下の説明においては、基礎梁１２及び支持杭２０を含んで構成される基礎構造全体を「基礎」と称す。 In addition, at a position where the support ground G2 is deep (the left side in the X direction in FIG. 1; in other words, the position where the foundation beam 12 and the support ground G2 are separated in the vertical direction), the support pile 20 is attached from the lower end of the foundation beam 12. It is a pile foundation type that is extended and supported on the supporting ground G2. In the following description, the entire foundation structure including the foundation beams 12 and the support piles 20 will be referred to as a "foundation".

（支持杭）
支持杭２０は、場所打ちコンクリート杭とされている。支持杭２０を図１におけるＸ方向左側から順に支持杭２０Ａ、２０Ｂ、２０Ｃ、２０Ｄ、２０Ｅ、２０Ｆ、２０Ｇとすると、これらの長さは、それぞれ設置されている位置における基礎梁１２から支持地盤Ｇ２までの距離に対応しており、支持杭２０Ａ＞２０Ｂ＞２０Ｃ＞２０Ｄ＞２０Ｅ＞２０Ｆ＞２０Ｇである。 (supporting pile)
The support piles 20 are cast-in-place concrete piles. Assuming that the support piles 20 are 20A, 20B, 20C, 20D, 20E, 20F, and 20G in order from the left side in the X direction in FIG. 20A>20B>20C>20D>20E>20F>20G.

支持杭２０（支持杭２０Ａ、２０Ｂ、２０Ｃ、２０Ｄ、２０Ｅ、２０Ｆ、２０Ｇ）の杭頭部は、基礎梁１２と一体化されたフーチング１４に固定されている。また、それぞれの支持杭２０の杭頭部には、柱４０の下端部が埋設されている。柱４０はコンクリート充填角型鋼管（ＣＦＴ）で形成された、建物１０の本設柱である。なお、柱４０はコンクリートを充填しない角型鋼管やＨ型鋼で形成したり（所謂鉄骨造）、Ｈ型鋼をコンクリートで被覆した鉄骨鉄筋コンクリート造とすることもできる。 The pile heads of the support piles 20 (support piles 20A, 20B, 20C, 20D, 20E, 20F, and 20G) are fixed to footings 14 integrated with the foundation beams 12 . A lower end of a pillar 40 is embedded in the pile head of each supporting pile 20 . Column 40 is a permanent column of building 10 formed of concrete-filled square steel (CFT). The column 40 can be made of a square steel pipe or H-shaped steel not filled with concrete (a so-called steel-framed structure), or can be made of a steel-framed reinforced concrete structure in which the H-shaped steel is coated with concrete.

なお、図１において支持杭２０Ａ、２０Ｂ、２０Ｃ、２０Ｄ、２０Ｅ、２０Ｆ、２０Ｇはそれぞれ１本ずつ示されているが、以下の説明において支持杭２０Ａ、２０Ｂ、２０Ｃ、２０Ｄ、２０Ｅ、２０Ｆ、２０Ｇとは、図２に示す支持杭２０のうち、同一の軸線（Ｙ方向に沿う軸線）上にある支持杭を総称するものとする。 In FIG. 1, each of the supporting piles 20A, 20B, 20C, 20D, 20E, 20F, and 20G is shown one each. is a general term for supporting piles on the same axis (an axis along the Y direction) among the supporting piles 20 shown in FIG.

（基礎梁）
図２に示すように、基礎梁１２は、Ｙ方向に沿って延設されＸ方向に間隔を空けて配置された基礎梁１２Ｘと、Ｘ方向に沿って延設されＹ方向に間隔を空けて配置された基礎梁１２Ｙと、を備えている。 (foundation beam)
As shown in FIG. 2, the foundation beams 12 are divided into foundation beams 12X extending along the Y direction and spaced apart in the X direction, and foundation beams 12X extending along the X direction and spaced apart in the Y direction. and a base beam 12Y arranged.

基礎梁１２Ｘは、図２におけるＸ方向左側から順に、基礎梁１２Ｘ１、１２Ｘ２、１２Ｘ３…１２Ｘ１０、１２Ｘ１１とする。また、基礎梁１２Ｙは、図２におけるＹ方向上側から順に、基礎梁１２Ｙ１、１２Ｙ２、１２Ｙ３…１２Ｙ６、１２Ｙ７とする。 The foundation beams 12X are defined as foundation beams 12X1, 12X2, 12X3, . 12Y6 and 12Y7 in order from the upper side in the Y direction in FIG.

図１に示すように、基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５は、他の基礎梁１２Ｘ（基礎梁１２Ｘ２、１２Ｘ４、１２Ｘ６、１２Ｘ７…１２Ｘ１０、１２Ｘ１１）と比較して、梁せいが大きい。より具体的には、基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５は、上端面の高さ位置が他の基礎梁１２Ｘと同一で、下端面の高さ位置が他の基礎梁１２Ｘより低い。 As shown in FIG. 1, the foundation beams 12X1, 12X3, and 12X5 have a larger beam thickness than the other foundation beams 12X (foundation beams 12X2, 12X4, 12X6, 12X7, . . . 12X10, 12X11). More specifically, the foundation beams 12X1, 12X3, and 12X5 have the same height position of the upper end surfaces as the other foundation beams 12X, and have lower height positions of the lower end surfaces than the other foundation beams 12X.

互いに隣接する基礎梁１２Ｘ間には、耐圧版１６と、スラブ１８と、が架け渡されている。耐圧版１６は、基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５以外の基礎梁１２Ｘ（基礎梁１２Ｘ２、１２Ｘ４、１２Ｘ６、１２Ｘ７…１２Ｘ１０、１２Ｘ１１）と、下面の高さを揃えて配置されている。これにより、基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５の下端部は、耐圧版１６の下方へ突出して、表層地盤Ｇ１へ根入れされている。以下の説明においては、この根入れ部分を、根入れ部１２ＸＥ（図３参照）と称す。 A pressure plate 16 and a slab 18 are bridged between the foundation beams 12X adjacent to each other. The pressure-resistant plate 16 is arranged so that its lower surface is aligned with the foundation beams 12X (foundation beams 12X2, 12X4, 12X6, 12X7, . As a result, the lower ends of the foundation beams 12X1, 12X3, and 12X5 protrude downward from the pressure plate 16 and are embedded in the surface ground G1. In the following description, this embedded portion is referred to as embedded portion 12XE (see FIG. 3).

また、スラブ１８は、基礎梁１２Ｘ（基礎梁１２Ｘ１、１２Ｘ２…１２Ｘ１０、１２Ｘ１１）と、上面の高さを揃えて配置されている。なお、耐圧版１６とスラブ１８の間の空間は、建物１０の地下ピットＰとして利用されている。 In addition, the slab 18 and the foundation beams 12X (foundation beams 12X1, 12X2, . A space between the pressure plate 16 and the slab 18 is used as an underground pit P of the building 10 .

図２には、建物１０の基礎伏図であるが、ここには表層地盤Ｇ１へ根入れされた根入れ部１２ＸＥを備えた基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５が網掛けして表示されている。 FIG. 2 is a foundation plan of the building 10, in which foundation beams 12X1, 12X3, and 12X5 having embedded portions 12XE embedded in the surface ground G1 are shaded.

同様に、Ｘ方向に沿って延設された基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７において、基礎梁１２Ｘ１、１２Ｘ５に挟まれた部分も網掛けして表示されている。すなわち、基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７において、基礎梁１２Ｘ１、１２Ｘ５に挟まれた部分も、基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５と同様に、表層地盤Ｇ１へ根入れされた部分を備えている。以下の説明においては、この根入れ部分を、根入れ部１２ＹＥと称す。 Similarly, in the foundation beams 12Y1, 12Y3, 12Y5, and 12Y7 extending along the X direction, the portions sandwiched between the foundation beams 12X1 and 12X5 are also shaded. That is, in the foundation beams 12Y1, 12Y3, 12Y5 and 12Y7, the portions sandwiched between the foundation beams 12X1 and 12X5 also have portions embedded into the surface ground G1, like the foundation beams 12X1, 12X3 and 12X5. In the following description, this embedded portion is referred to as embedded portion 12YE.

このため、図２に一点鎖線で囲んで示したように、建物１０の底部には、根入れ部１２ＸＥ、１２ＹＥで囲まれた平面視で略四角形の領域Ｖが形成される。領域Ｖは四方を根入れ部１２ＸＥ、１２ＹＥで囲まれ、格子状に配置される。また、この領域Ｖにはそれぞれ表層地盤Ｇ１を形成する土砂が充填されている。 For this reason, as shown by the dashed-dotted line in FIG. 2, the bottom of the building 10 is formed with a substantially quadrangular region V in plan view surrounded by the embedded portions 12XE and 12YE. The region V is surrounded on all four sides by the embedded portions 12XE and 12YE and arranged in a grid pattern. Further, the regions V are filled with earth and sand forming the surface ground G1.

図３には、根入れ部１２ＸＥを備えた基礎梁１２Ｘ５の断面が示されている。基礎梁１２Ｘ５には、基礎梁１２Ｘ５の上端部から下端部（根入れ部１２ＸＥの下端部）までの範囲において、梁主筋３２を取り囲むあばら筋３４が巻きつけられている。さらに、基礎梁１２Ｘ５の中央部から下端部までの範囲において、あばら筋３４の間に、曲げ補強筋３６が配置されている。以下の説明においては、梁主筋３２、あばら筋３４、曲げ補強筋３６を総称して梁鉄筋３０と称す。 FIG. 3 shows a section of the foundation beam 12X5 with the embedded portion 12XE. Stirrups 34 surrounding the beam main reinforcement 32 are wound around the base beam 12X5 in the range from the upper end to the lower end (the lower end of the embedded portion 12XE) of the base beam 12X5. Further, bending reinforcing bars 36 are arranged between the stirrups 34 in the range from the central portion to the lower end of the foundation beam 12X5. In the following description, the beam main reinforcing bars 32, the stirrups 34, and the bending reinforcing bars 36 are collectively referred to as beam reinforcing bars 30.

なお、図３においては基礎梁１２Ｘ５の構成を明確にするため、フーチング１４の図示は省略されているが、図１に示すように、根入れ部１２ＸＥを備えた基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５が接合されるフーチング１４は、下端面の高さ位置が基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５の下端面より低い位置とされている。 Although the illustration of the footing 14 is omitted in FIG. 3 to clarify the configuration of the foundation beam 12X5, as shown in FIG. The footing 14 to be joined has a lower end surface at a position lower than the lower end surfaces of the foundation beams 12X1, 12X3, and 12X5.

基礎梁１２Ｘ１、１２Ｘ３も基礎梁１２Ｘ５と同様の構成とされており、根入れ部１２ＹＥを備えた基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７も、基礎梁１２Ｘ５と同様の構成とされている。 The foundation beams 12X1 and 12X3 have the same configuration as the foundation beam 12X5, and the foundation beams 12Y1, 12Y3, 12Y5 and 12Y7 having the embedded portion 12YE have the same configuration as the foundation beam 12X5.

（基礎構築方法）
根入れ部１２ＸＥを備えた基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５、根入れ部１２ＹＥを備えた基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７の構築方法について説明する。なお、これらの基礎梁１２Ｘ、１２Ｙの構築方法は同様であるが、ここでは一例として基礎梁１２Ｘ５について説明するものとする。 (Foundation construction method)
A method of constructing the foundation beams 12X1, 12X3 and 12X5 with the embedded portion 12XE and the foundation beams 12Y1, 12Y3, 12Y5 and 12Y7 with the embedded portion 12YE will be described. Although the method of constructing these foundation beams 12X and 12Y is the same, the foundation beam 12X5 will be explained here as an example.

まず図４（Ａ）に示すように、表層地盤Ｇ１を掘削して、掘削溝５０を形成する。掘削溝５０は、基礎梁１２Ｘ５（不図示）の延設方向に沿って形成され、溝底５２は略水平に地均しされ、溝壁である法面５４は溝底５２に対して傾斜して形成される。 First, as shown in FIG. 4A, the surface ground G1 is excavated to form an excavated groove 50. Then, as shown in FIG. The excavated groove 50 is formed along the extending direction of the foundation beam 12X5 (not shown), the groove bottom 52 is leveled substantially horizontally, and the slope 54 which is the groove wall is inclined with respect to the groove bottom 52. formed by

次に図４（Ｂ）に示すように、溝底５２に砕石及び捨てコンクリート５６を敷設後、梁型枠５８を構築する。梁型枠５８は亜鉛めっき鋼板で形成され、法面５４と離間した位置に、略鉛直方向に沿って立設される。 Next, as shown in FIG. 4B, after laying crushed stone and dump concrete 56 on the groove bottom 52, a beam formwork 58 is constructed. The beam formwork 58 is formed of a galvanized steel plate and erected substantially vertically at a position separated from the slope 54 .

次に図４（Ｃ）に示すように、梁型枠５８と法面５４との間に、埋め戻し材６０を埋め戻す。埋め戻し材６０は、掘削溝５０を形成する際に掘り出した土砂（表層地盤Ｇ１を形成する土砂）にセメントを混合した改良土であり、掘削前の表層地盤Ｇ１と比較してせん断強度が高められている。 Next, as shown in FIG. 4(C), a backfilling material 60 is backfilled between the beam formwork 58 and the slope 54 . The backfilling material 60 is improved soil obtained by mixing cement with the earth and sand excavated when forming the excavated trench 50 (earth and sand forming the surface ground G1), and has a higher shear strength than the surface ground G1 before excavation. It is

次に図５（Ａ）に示すように、埋め戻し材６０の上部及び表層地盤Ｇ１の上部に砕石及び捨てコンクリート６２を敷設後、梁型枠５８の内側及び梁型枠５８の内側から上方へ突出する部分に、梁鉄筋３０を配設する。また、耐圧版１６のスラブ主筋（不図示）を配設する。 Next, as shown in FIG. 5(A), after laying crushed stone and waste concrete 62 on the top of the backfilling material 60 and the top of the surface ground G1, the inside of the beam form 58 and the inside of the beam form 58 are pushed upward. A beam reinforcing bar 30 is arranged in the projecting portion. Moreover, the slab main reinforcement (not shown) of the pressure plate 16 is arranged.

次に図５（Ｂ）に示すように、根入れ部１２ＸＥを形成するコンクリートと耐圧版１６を形成するコンクリートとを一体的に打設する（点線Ｐ１で示される部分まで）。また、耐圧版１６の上部へ梁型枠６４を構築し、基礎梁１２Ｘ５を形成するコンクリートを打設する（点線Ｐ２で示される部分まで）。さらに、スラブ型枠６６を構築し、スラブ１８を形成するコンクリートを打設する。 Next, as shown in FIG. 5B, the concrete forming the embedded portion 12XE and the concrete forming the pressure plate 16 are cast integrally (up to the portion indicated by the dotted line P1). In addition, a beam formwork 64 is constructed above the pressure plate 16, and concrete for forming the foundation beam 12X5 is placed (up to the portion indicated by the dotted line P2). Further, a slab formwork 66 is constructed and the concrete forming the slab 18 is poured.

以上の工程により、耐圧版１６の上方及び下方に突出した基礎梁１２Ｘ５が構築される。この基礎梁１２Ｘ５においては、耐圧版１６の下方に突出した部分は、表層地盤Ｇ１に根入れされて根入れ部１２ＸＥを形成している。また、耐圧版１６の上方に突出した部分には、スラブ１８が接合されている。なお図３においては、捨てコンクリート５６、６２、梁型枠５８の図示は省略されている。 Through the above steps, the foundation beams 12X5 projecting upward and downward from the pressure plate 16 are constructed. In this foundation beam 12X5, the portion protruding downward of the pressure plate 16 is embedded in the surface ground G1 to form an embedded portion 12XE. A slab 18 is joined to the portion of the pressure plate 16 that protrudes upward. In FIG. 3, the illustration of the dump concrete 56, 62 and the beam formwork 58 is omitted.

（作用・効果）
本実施形態の基礎構造においては、基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５が、耐圧版１６の下方へ突出し表層地盤Ｇ１に根入れされた根入れ部１２ＸＥを備えている。また、基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７が、耐圧版１６の下方へ突出し表層地盤Ｇ１に根入れされた根入れ部１２ＹＥを備えている。 (action/effect)
In the foundation structure of this embodiment, the foundation beams 12X1, 12X3, and 12X5 are provided with embedded portions 12XE that protrude downward from the pressure plate 16 and are embedded in the surface ground G1. Further, the foundation beams 12Y1, 12Y3, 12Y5, and 12Y7 are provided with embedded portions 12YE that protrude downward from the pressure plate 16 and are embedded in the surface ground G1.

このため地震時に図２に示すＸ方向の力が作用した際、基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５が地盤に対して動こうとすると、根入れ部１２ＸＥが表層地盤Ｇ１から土のせん断抵抗力を受ける。また、Ｙ方向の力が作用した際、基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７が地盤に対して動こうとすると、根入れ部１２ＹＥが表層地盤Ｇ１から土のせん断抵抗力を受ける。 Therefore, when the force in the X direction shown in FIG. 2 acts during an earthquake, when the foundation beams 12X1, 12X3, and 12X5 try to move with respect to the ground, the embedded section 12XE receives the shear resistance force of the soil from the surface ground G1. . Further, when a force in the Y direction is applied, if the foundation beams 12Y1, 12Y3, 12Y5, and 12Y7 try to move with respect to the ground, the embedded portion 12YE receives the shear resistance force of the soil from the surface ground G1.

これに対して、基礎梁に根入れ部がない場合、この基礎梁は表層地盤Ｇ１から土のせん断抵抗を得ることができない。このため、基礎梁１２Ｘ、１２Ｙは、根入れ部１２ＸＥ、１２ＹＥがない基礎梁と比較して、基礎の地盤に対するせん断抵抗力を高めることができる。 On the other hand, if the foundation beam does not have an embedded portion, the foundation beam cannot obtain soil shear resistance from the surface ground G1. Therefore, the foundation beams 12X and 12Y can increase the shear resistance against the ground of the foundation compared to the foundation beams without the embedded portions 12XE and 12YE.

また、本実施形態の基礎構造においては、根入れ部１２ＸＥ、１２ＹＥが表層地盤Ｇ１を四方から取り囲むように配置されている。このため、地震時にどの方向から力が作用しても、何れかの基礎梁１２が表層地盤Ｇ１から土のせん断抵抗力を受ける。これにより、根入れ部１２ＸＥ、１２ＹＥが表層地盤Ｇ１を四方から取り囲まない場合（例えば三方から取り囲む場合、二方向から接する場合等）と比較して、基礎の地盤に対するせん断抵抗力を高めることができる。 In addition, in the foundation structure of this embodiment, the embedded portions 12XE and 12YE are arranged so as to surround the surface ground G1 from all sides. Therefore, any foundation beam 12 receives the shear resistance force of the soil from the surface layer ground G1 regardless of which direction a force acts upon during an earthquake. As a result, compared to the case where the embedded parts 12XE and 12YE do not surround the surface ground G1 from all sides (for example, when it surrounds from three sides, when it touches from two directions, etc.), it is possible to increase the shear resistance of the foundation to the ground. .

また、本実施形態の基礎構造では、図３に示すように、根入れ部１２ＸＥ、１２ＹＥは基礎梁１２Ｘ、１２Ｙの一部であり、根入れ部１２ＸＥ、１２ＹＥの内部には、基礎梁１２Ｘ、１２Ｙのあばら筋３４の他、あばら筋３４の間に配置された曲げ補強筋３６が設けられている。 In addition, in the foundation structure of the present embodiment, as shown in FIG. 3, the embedded portions 12XE and 12YE are part of the foundation beams 12X and 12Y, and the embedded portions 12XE and 12YE include the foundation beams 12X and 12YE. In addition to the stirrups 34 of 12Y, bending reinforcing bars 36 arranged between the stirrups 34 are provided.

このため、根入れ部１２ＸＥ、１２ＹＥには、土圧による曲げモーメントが加わるが、これらのあばら筋３４及び曲げ補強筋３６が根入れ部１２ＸＥ、１２ＹＥの曲げ変形を抑制する。このため根入れ部１２ＸＥ、１２ＹＥは、土圧に対して曲げ破壊し難い。 Therefore, although a bending moment due to earth pressure is applied to the embedded portions 12XE and 12YE, the stirrups 34 and the bending reinforcing bars 36 suppress the bending deformation of the embedded portions 12XE and 12YE. For this reason, the embedded portions 12XE and 12YE are less likely to bend and break due to earth pressure.

また、本実施形態の基礎構造では、基礎梁１２Ｘ５の上端部にスラブ１８が接合されている。このため、根入れ部１２ＸＥに土圧が作用して基礎梁１２Ｘ５の上端部に回転モーメントが作用しても、基礎梁１２Ｘ５は、スラブ１８から受ける反力により変形が抑制される。基礎梁１２Ｘ１、１２Ｘ３についても同様であり、根入れ部１２ＹＥを備えた基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７についても同様である。 Moreover, in the foundation structure of this embodiment, the slab 18 is joined to the upper end portion of the foundation beam 12X5. Therefore, even if soil pressure acts on the embedded portion 12XE and a rotational moment acts on the upper end portion of the foundation beam 12X5, deformation of the foundation beam 12X5 is suppressed by the reaction force received from the slab 18. The same applies to the base beams 12X1 and 12X3, and the same applies to the base beams 12Y1, 12Y3, 12Y5 and 12Y7 provided with the embedded portion 12YE.

また、本実施形態の基礎構築方法より形成される基礎梁１２Ｘ５においては、梁型枠５８が亜鉛めっき鋼板とされているため、木製の型枠と比較して腐食しにくい。このため基礎梁１２Ｘ５の根入れ部１２ＸＥと埋め戻し材６０との間に隙間が生じにくく、地震時に基礎梁１２Ｘ５が表層地盤Ｇ１に対して動いた際、表層地盤Ｇ１はせん断抵抗力を即座に発揮することができる。基礎梁１２Ｘ１、１２Ｘ３についても同様であり、根入れ部１２ＹＥを備えた基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７についても同様である。 In addition, in the foundation beam 12X5 formed by the foundation construction method of the present embodiment, the beam formwork 58 is made of galvanized steel, so it is less likely to corrode than a wooden formwork. Therefore, a gap is less likely to occur between the embedded portion 12XE of the foundation beam 12X5 and the backfilling material 60, and when the foundation beam 12X5 moves relative to the surface ground G1 during an earthquake, the surface ground G1 immediately absorbs shear resistance. can demonstrate. The same applies to the base beams 12X1 and 12X3, and the same applies to the base beams 12Y1, 12Y3, 12Y5 and 12Y7 provided with the embedded portion 12YE.

なお、本実施形態に係る建物１０は、図１に示すように、表層地盤Ｇ１の下方に、傾斜した支持地盤Ｇ２が形成された敷地に立つ構造物である。そして建物１０は、図１におけるＸ方向右側では直接基礎で支持され、Ｘ方向左側では杭基礎で支持されている。また、支持杭２０は、Ｘ方向左側に向かう程長い。このため、建物１０の基礎はせん断剛性の偏りが大きく、建物１０の右側に寄るほどせん断剛性が高い。 As shown in FIG. 1, the building 10 according to the present embodiment is a structure that stands on a site with an inclined supporting ground G2 formed below the surface ground G1. The building 10 is supported by a straight foundation on the right side in the X direction in FIG. 1, and by a pile foundation on the left side in the X direction. Also, the support pile 20 is longer toward the left side in the X direction. Therefore, the foundation of the building 10 has a large deviation in shear rigidity, and the shear rigidity increases toward the right side of the building 10 .

本実施形態に係る建物１０では、支持杭２０Ｆ、２０Ｇと比較して長さが長い支持杭２０Ａ、２０Ｃ、２０Ｅが設置された部分、すなわち他の部分と比較して基礎のせん断剛性が低い部分の基礎梁１２に、根入れ部１２ＸＥ、１２ＹＥを設けている。これにより、基礎のせん断剛性が平準化されている。このため、支持杭２０がせん断破壊し難い。 In the building 10 according to the present embodiment, the portion where the supporting piles 20A, 20C, and 20E having a longer length than the supporting piles 20F and 20G are installed, that is, the portion where the shear rigidity of the foundation is lower than other portions The foundation beam 12 is provided with embedded portions 12XE and 12YE. This equalizes the shear stiffness of the foundation. Therefore, the support pile 20 is less likely to shear fracture.

これに対して、根入れ部１２ＸＥ、１２ＹＥを設けない場合、地震時には、他の支持杭と比較して長さが短い支持杭２０Ｆ、２０Ｇに、せん断力が集中しせん断破壊しやすい。 On the other hand, if the embedded portions 12XE and 12YE are not provided, the shear force concentrates on the support piles 20F and 20G, which are shorter in length than the other support piles, and the support piles are likely to undergo shear failure during an earthquake.

なお、本実施形態の基礎梁１２Ｘ５においては、あばら筋３４の間に曲げ補強筋３６が設けられているが、本発明の実施形態はこれに限らない。例えば曲げ補強筋３６に代えて、根入れ部１２ＸＥを持たない基礎梁１２Ｘ２、１２Ｘ４等よりあばら筋３４のピッチを細かくして曲げ補強してもよい。 In addition, in the foundation beam 12X5 of the present embodiment, the bending reinforcing bars 36 are provided between the stirrups 34, but the embodiment of the present invention is not limited to this. For example, instead of the bending reinforcing bars 36, the pitch of the stirrups 34 may be finer than the foundation beams 12X2, 12X4, etc., which do not have the embedded portions 12XE.

または、あばら筋３４の本数を変えず、径を太くしてもよい。このような構成によっても、根入れ部１２ＸＥが土圧に対して曲げ破壊し難くすることができる。基礎梁１２Ｘ１、１２Ｘ３についても同様であり、根入れ部１２ＹＥを備えた基礎梁１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７についても同様である。 Alternatively, the diameter of the stirrups 34 may be increased without changing the number of stirrups 34 . Such a configuration also makes it difficult for the embedded portion 12XE to bend and break against earth pressure. The same applies to the base beams 12X1 and 12X3, and the same applies to the base beams 12Y1, 12Y3, 12Y5 and 12Y7 provided with the embedded portion 12YE.

なお、根入れ部１２ＸＥ、１２ＹＥの根入れ深さが大きくない場合（例えば１ｍ未満の場合）、根入れ部１２ＸＥ、１２ＹＥの底部が受ける最大土圧は小さくなる。このような場合、曲げ補強筋は必ずしも設けなくてもよい。 If the penetration depth of the embedded parts 12XE and 12YE is not large (for example, less than 1 m), the maximum earth pressure that the bottoms of the embedded parts 12XE and 12YE receive becomes small. In such a case, the bending reinforcement may not necessarily be provided.

また、本実施形態においては、基礎梁１２Ｘ５の上端部にスラブ１８が接合されているが、本発明の実施形態はこれに限らず、スラブ１８は基礎梁１２Ｘ５の中央部に設けてもよいし、あるいは設けなくてもよい。スラブ１８を設けなくても、基礎梁１２Ｘ５にはＸ方向に延設された基礎梁１２Ｙが接合されているため、根入れ部１２ＸＥに土圧が作用した際に、基礎梁１２Ｘ５の回転抑制効果を得ることができる。 Also, in the present embodiment, the slab 18 is joined to the upper end of the foundation beam 12X5, but the embodiment of the present invention is not limited to this, and the slab 18 may be provided in the center of the foundation beam 12X5. , or may not be provided. Even if the slab 18 is not provided, since the foundation beam 12Y extending in the X direction is joined to the foundation beam 12X5, the effect of suppressing the rotation of the foundation beam 12X5 when earth pressure acts on the embedded portion 12XE. can be obtained.

なお、本実施形態において、梁型枠５８として亜鉛めっき鋼板を用いているが、本発明の実施形態はこれに限らない。例えばステンレス板や樹脂板、プレキャストコンクリート板等を用いても、木製の型枠より腐食しにくいため、表層地盤Ｇ１はせん断抵抗力を発揮しやすい。 In addition, although the galvanized steel plate is used as the beam formwork 58 in this embodiment, the embodiment of the present invention is not limited to this. For example, even if a stainless steel plate, a resin plate, a precast concrete plate, or the like is used, it is less likely to corrode than a wooden formwork, so the surface layer G1 is likely to exhibit shear resistance.

また、本実施形態においては梁型枠５８と掘削溝５０の法面５４との間の埋め戻し材６０として、表層地盤Ｇ１を形成する土砂にセメントを混合した改良土を用いたが、本発明の実施形態はこれに限らない。例えば表層地盤Ｇ１を形成する土砂に生石灰を混和した改良土や、固化材を混和した改良土等を用いてもよい。すなわち、埋め戻し材６０の周囲にある、表層地盤Ｇ１を形成する土砂よりせん断強度が低くなければよい。 Further, in this embodiment, as the backfilling material 60 between the beam formwork 58 and the slope 54 of the excavated groove 50, improved soil obtained by mixing cement with the earth and sand forming the surface layer G1 is used. is not limited to this. For example, improved soil in which quicklime is mixed with earth and sand forming the surface layer G1, or improved soil in which a solidifying material is mixed may be used. That is, the shear strength should not be lower than that of the earth and sand forming the surface ground G1 around the backfilling material 60 .

さらに、梁型枠５８及び埋め戻し材６０を省略することもできる。この場合、図４（Ａ）に示された掘削溝５０を形成した後、図５（Ａ）に示された梁鉄筋３０を配設し、さらにこの掘削溝５０及び表層地盤Ｇ１の上部へ、図５（Ｂ）にＰ１で示された位置までコンクリートを打設する。その後、梁型枠６４を組付けコンクリートを打設して基礎梁を形成する。このようにすることでも、表層地盤Ｇ１に根入れされた根入れ部を備えた基礎梁を形成することができる。 Additionally, the beam formwork 58 and the backfill material 60 may be omitted. In this case, after forming the excavated groove 50 shown in FIG. 4A, the beam reinforcing bars 30 shown in FIG. Concrete is placed up to the position indicated by P1 in FIG. 5(B). After that, the beam formwork 64 is assembled and concrete is placed to form the foundation beam. By doing so, it is also possible to form a foundation beam having an embedded portion that is embedded in the surface ground G1.

また、本実施形態に係る基礎構造は、互いに長さの異なる複数の支持杭（支持杭２０Ａ、２０Ｂ…２０Ｇ）を備えた建物１０において、他の支持杭より長い支持杭２０Ａ、２０Ｃ、２０Ｅが設置された部分の基礎梁１２Ｘ１、１２Ｘ３、１２Ｘ５、１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７に適用したが、本発明の実施形態はこれに限らない。例えば基礎のせん断抵抗力を高くしたい場合は、どのような場所に適用してもよい。 Further, in the foundation structure according to the present embodiment, in the building 10 including a plurality of supporting piles (supporting piles 20A, 20B ... 20G) having different lengths, the supporting piles 20A, 20C, 20E longer than the other supporting piles Although applied to the foundation beams 12X1, 12X3, 12X5, 12Y1, 12Y3, 12Y5, and 12Y7 of the installed portions, the embodiment of the present invention is not limited to this. For example, if you want to increase the shear resistance of the foundation, you can apply it anywhere.

例えば、基礎梁１２Ｘ２、１２Ｘ４、基礎梁１２Ｙ２、１２Ｙ４、１２Ｙ６において基礎梁１２Ｘ１及び基礎梁１２Ｘ５に挟まれた部分に根入れ部１２ＸＥ、１２ＹＥを適用すれば、上記実施形態よりせん断抵抗力を高くすることができる。 For example, if the embedded portions 12XE and 12YE are applied to the portions sandwiched between the foundation beam 12X1 and the foundation beam 12X5 in the foundation beams 12X2, 12X4 and 12Y2, 12Y4 and 12Y6, the shear resistance is increased compared to the above embodiment. be able to.

あるいは、基礎梁１２Ｘ１、１２Ｘ５、基礎梁１２Ｙ１、１２Ｙ７において基礎梁１２Ｘ１及び基礎梁１２Ｘ５に挟まれた部分のみに根入れ部１２ＸＥ、１２ＹＥを適用すれば、根入れ部１２ＸＥ、１２ＹＥを全く備えない構成よりせん断抵抗力は高くなるが、上記実施形態よりせん断抵抗力を低くすることができる。このように、本実施形態に係る基礎構造を適用する基礎梁は、求められるせん断抵抗力に応じて、適宜選択することができる。 Alternatively, if the embedded portions 12XE and 12YE are applied only to the portions of the foundation beams 12X1 and 12X5 and the foundation beams 12Y1 and 12Y7 sandwiched between the foundation beams 12X1 and 12X5, the configuration without the embedded portions 12XE and 12YE at all. Although the shear resistance becomes higher, the shear resistance can be made lower than in the above embodiment. Thus, the foundation beams to which the foundation structure according to the present embodiment is applied can be appropriately selected according to the required shear resistance.

また、本実施形態に係る基礎構造が適用される建物は、表層地盤Ｇ１の下方に傾斜した支持地盤Ｇ２が形成された敷地に建つ建物としたが、本発明の実施形態はこれに限らない。例えば図６に示す建物７０のように、支持地盤Ｇ２の深さが略一定である敷地に建つ建物としてもよい。このような建物７０の任意の基礎梁１２についても、表層地盤Ｇ１に対するせん断抵抗力を高めることができる。 In addition, the building to which the foundation structure according to the present embodiment is applied is a building built on a site where the supporting ground G2 inclined downward from the surface ground G1 is formed, but the embodiment of the present invention is not limited to this. For example, like the building 70 shown in FIG. 6, the building may be built on a site where the depth of the supporting ground G2 is substantially constant. Any foundation beam 12 of such a building 70 can also be enhanced in shear resistance against the surface ground G1.

具体的には、例えば建物７０の重心位置と剛心位置が異なる場合、剛心から離れた位置の基礎梁１２に本実施形態に係る基礎構造を適用することで、剛心位置を重心位置に近づけて建物７０の捩れ変形を抑制することができる。 Specifically, for example, when the center of gravity of the building 70 and the position of the center of rigidity are different, applying the foundation structure according to the present embodiment to the foundation beams 12 located away from the center of rigidity brings the position of the center of rigidity closer to the center of gravity. torsional deformation of the building 70 can be suppressed.

またさらに、本発明の実施形態に係る基礎構造は、根入れ部１２ＸＥ又は１２ＹＥを有する基礎梁１２を備えていれば、支持杭２０は備えていなくてもよい。すなわち、支持地盤上に直接支持されている建物において適用できる。この場合、根入れ部１２ＸＥ又は１２ＹＥは比較的硬質な支持地盤からせん断抵抗を受けるので、基礎のせん断抵抗力向上効果を得やすい。 Furthermore, the foundation structure according to the embodiment of the present invention may not include the support piles 20 as long as it includes the foundation beams 12 having the embedded portions 12XE or 12YE. That is, it can be applied to buildings that are directly supported on the supporting ground. In this case, since the embedded portion 12XE or 12YE receives shear resistance from the relatively hard support ground, it is easy to obtain the effect of improving the shear resistance of the foundation.

１６ 耐圧版（コンクリート床版）
１２Ｘ１、１２Ｘ３、１２Ｘ５ 基礎梁
１２Ｙ１、１２Ｙ３、１２Ｙ５、１２Ｙ７ 基礎梁
１２ＸＥ、１２ＹＥ 根入れ部
３６ 曲げ補強筋
５０ 掘削溝
５４ 溝壁
５８ 梁型枠
６０ 埋め戻し材
Ｇ１ 表層地盤（地盤） 16 pressure slab (concrete floor slab)
12X1, 12X3, 12X5 Foundation beams 12Y1, 12Y3, 12Y5, 12Y7 Foundation beams 12XE, 12YE Embedding part 36 Bending reinforcing bar 50 Excavated groove 54 Ditch wall 58 Beam formwork 60 Backfill material G1 Surface ground (ground)

Claims (5)

地盤上に設けられたコンクリート床版と、
前記コンクリート床版の上方へ突出する基礎梁と、
前記基礎梁の一部に形成され、前記コンクリート床版の下方へ突出して前記地盤へ根入れされた根入れ部と、
前記基礎梁の上端から前記根入れ部の下端まで配筋されたあばら筋と、
を有する基礎構造。 a concrete floor slab provided on the ground;
a foundation beam projecting upward from the concrete floor slab;
an embedded part formed in a part of the foundation beam, projecting downward from the concrete floor slab and embedded into the ground;
a stirrup arranged from the upper end of the base beam to the lower end of the embedded portion;
foundation structure with 前記基礎梁の中央部から前記根入れ部の下端部までの範囲において、互いに隣り合う前記あばら筋の間に、前記あばら筋に沿って平行に設けられ、土圧による曲げ変形に対して抵抗する曲げ補強筋を有する請求項１に記載の基礎構造。 In the range from the central part of the foundation beam to the lower end of the embedment part, it is provided between the stirrups adjacent to each other in parallel along the stirrups, and resists bending deformation due to earth pressure. 2. Substructure according to claim 1, having bending reinforcements. 前記基礎梁には支持杭が固定されている、請求項１または２に記載の基礎構造。 3. Foundation structure according to claim 1 or 2, wherein supporting piles are fixed to the foundation beams. 前記支持杭として、前記基礎梁と一体化されたフーチングに杭頭部が固定され、支持地盤に下端部が固定された、長さが異なる複数の支持杭を備え、
前記根入れ部は、複数の前記支持杭のうち、少なくとも長さが最も長い前記支持杭が固定された前記基礎梁に形成され、長さが最も短い前記支持杭が固定された前記基礎梁には形成されていない、
請求項３に記載の基礎構造。 As the support piles, a plurality of support piles with different lengths having pile heads fixed to the footing integrated with the foundation beam and lower ends fixed to the support ground,
The embedded portion is formed in the foundation beam to which at least the longest supporting pile among the plurality of supporting piles is fixed, and is formed in the foundation beam to which the shortest supporting pile is fixed. is not formed,
Substructure according to claim 3. 地盤を掘削して掘削溝を形成する工程と、
前記掘削溝へ鉄筋を配筋する工程と、
前記掘削溝及び前記掘削溝を形成した地盤面にコンクリートを打設して、コンクリート床版及び前記コンクリート床版の下方へ突出した根入れ部を形成する工程と、
前記掘削溝の上方及び前記掘削溝が形成されていない前記コンクリート床版の上方へコンクリートを打設して、前記コンクリート床版の上方へ突出し、かつ、一部が前記地盤に根入れされた基礎梁を形成する工程と、
を有し、
前記鉄筋は、前記基礎梁の上端から前記根入れ部の下端まで配筋されたあばら筋である、
基礎構築方法。 A step of excavating the ground to form an excavated trench;
A step of arranging reinforcing bars in the excavated trench;
a step of placing concrete in the excavated groove and the ground surface on which the excavated groove is formed to form a concrete floor slab and an embedding portion projecting downward from the concrete floor slab;
Concrete is placed above the excavated groove and above the concrete floor slab where the excavated groove is not formed, and the foundation protrudes above the concrete floor slab and is partially embedded in the ground. forming a beam;
has
The reinforcing bars are stirrups arranged from the upper end of the base beam to the lower end of the embedded portion.
Foundation construction method.
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