WO2016181669A1 - Rigid connection structure for bottom end of pillar and concrete pile - Google Patents
Rigid connection structure for bottom end of pillar and concrete pile Download PDFInfo
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- WO2016181669A1 WO2016181669A1 PCT/JP2016/052411 JP2016052411W WO2016181669A1 WO 2016181669 A1 WO2016181669 A1 WO 2016181669A1 JP 2016052411 W JP2016052411 W JP 2016052411W WO 2016181669 A1 WO2016181669 A1 WO 2016181669A1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
Definitions
- the present invention mainly relates to a rigidly connected structure of a pillar lower end and a concrete pile such as a three-dimensional crossing bridge, a viaduct, an elevated structure, a general bridge, or a railway bridge.
- a heavy building such as a road bridge 1 has a configuration in which the load is transmitted to the ground 5 by a bridge pier 3 as a support.
- the pier lower end 4 which is the lower end of the pier 3
- the RC pile 6 (concrete reinforced with reinforcing bars) arranged vertically are rigidly connected by the rigid structures 10, 100. Yes.
- the load acting on the building is mainly in the vertical direction due to its own weight and in the horizontal direction due to earthquakes.
- horizontal loads frequently act on buildings, so the importance of rigid structures that generate large bending moments due to these loads increases.
- Patent Document 1 As a conventional rigid structure, there has been proposed a structure in which a large number of displacement preventing holes (perforated steel plate gibber: PBL) are formed in an extended portion extending downward from a lower end portion of a pier (see, for example, Patent Document 1). ).
- the rigid structure described in Patent Document 1 has a configuration in which the extension portion itself transmits the load in the horizontal direction from the lower end portion of the pier to the RC pile as a strength member.
- an object of the present invention is to provide a rigid structure of a column lower end portion and a concrete pile that can reduce manufacturing time and cost and can improve reliability.
- a rigid structure according to the first invention is a rigid structure of a lower end portion of a support and a concrete pile, An extension that extends downward from the lower end of the column and is placed on the concrete pile, An outer vertical rib group provided on the outer surface of the extension part and formed with a number of anti-slip holes; With external concrete cast on the outer periphery of the extension, The external concrete embeds a reinforcing bar group extending upward from the inside of the concrete pile and the outer vertical rib group.
- the rigid structure according to the second invention is the rigid structure according to the first invention, the inner vertical rib group provided on the inner surface of the extension portion and formed with a number of detent holes, An internal concrete placed inside the extension, The internal concrete embeds the inner vertical rib group.
- the rigid structure according to the third aspect of the invention is the rigid structure according to the first or second aspect of the invention, comprising a vertical cylindrical portion connected to the outer vertical rib group and surrounding the outside of the extension portion, The said vertical cylinder part becomes a formwork at the time of placing external concrete.
- the extension in the rigid structure according to the first or second invention has a cylindrical shape
- An outer vertical rib group consists of many outer vertical ribs arrange
- the rigid structure according to the fifth aspect of the invention is the outer peripheral reinforcement group in which the reinforcing bars embedded in the external concrete in the rigid structure according to the first or second aspect of the invention are main reinforcing bars that reinforce the concrete pile. And an inner periphery reinforcing bar group which is a reinforcing bar fixed to the outer peripheral reinforcing bar group inside the concrete pile.
- the outer vertical rib group embedded in the external concrete sufficiently reduces the stress generated when transmitting the load from the lower end of the support column. Therefore, it is not necessary to form an anti-displacement hole, and as a result, manufacturing time and cost can be reduced. Moreover, since the space
- FIG. 1 is a general side view of a road bridge using a rigid structure according to an embodiment of the present invention. It is a longitudinal cross-sectional view of the rigid structure which concerns on Example 1 of this invention. It is the perspective view which abbreviate
- FIG. 4 is a cross-sectional view taken along line AA in FIG. 3.
- FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a cross-sectional view for demonstrating the cross-sectional secondary moment of an outer vertical rib group. It is a figure and graph for demonstrating the stress which generate
- the road bridge 1 includes a bridge girder 2 through which people or vehicles pass, and a plurality of bridge piers 3 (an example of support columns) that support the bridge girder 2.
- the lower ends of these piers 3, that is, the lower ends of the piers 4 (which are an example of the lower ends of the columns) are rigidly attached to columnar RC piles 6 (concrete reinforced with reinforcing bars) arranged vertically on the ground 5. It is tied. Rigidly connecting the pier lower end 4 and the RC pile 6 is the rigid structure 10, 100.
- the rigid structure 10 includes, as steel portions 12 to 15, an extension portion 12 extending downward from the pier lower end portion 4 and a lower portion of the extension portion 12.
- a vertical cylindrical portion 13 that surrounds the outside of a lower extension 23 (described later in detail), and an outer vertical rib group 14 and an inner vertical rib group 15 (strength members provided on the outer surface and the inner surface of the lower extension 23, respectively) 2).
- the rigid structure 10 is formed as a concrete portion 16-18 between the lower extension 23 and the vertical cylinder 13 (that is, the lower extension).
- the extension portion 12 is placed on the pile head 7 of the RC pile 6 via an installation stand 68 (H-shaped steel or the like) as shown in FIG. 2 and 3, the extension portion 12 includes a diaphragm 20 disposed horizontally at the upper end height of the outer longitudinal rib group 14 and the inner longitudinal rib group 15, and an upper upper portion by the diaphragm 20.
- the extension portion 22 includes a lower extension portion 23 below the diaphragm 20.
- the diaphragm 20 has an opening 21 into which ready-mixed concrete for the internal concrete 17 is poured from above.
- the upper extension portion 22 and the lower extension portion 23 have a cylindrical shape concentric with the RC pile 6 and have a smaller diameter than the RC pile 6. As shown in FIG.
- the lower extension 23 does not have anything other than the inner concrete 17 and the inner vertical rib group 15 in the interior thereof for the workability when placing the inner concrete 17.
- the extension part 12 is provided with a stopper hole (perforated steel plate gibber: PBL) need not be formed.
- the vertical cylinder portion 13 has a cylindrical shape concentric with the RC pile 6 and the extension portion 12, and has a slightly larger diameter than the RC pile 6.
- the lower end of the vertical cylinder part 13 is slightly lower than the pile head 7 of the RC pile 6, and the upper end of the vertical cylinder part 13 is the same height (or higher) as the outer vertical rib group 14.
- the said vertical cylinder part 13 is in contact with the soil of the ground 5 in the outer surface, as shown in FIG.
- the said vertical cylinder part 13 is the secondary member (including corrosion margin) which functions as a formwork for placing the external concrete 16, and a band reinforcement after the placement.
- the outer vertical rib group 14 is composed of a plurality of outer vertical ribs 40 arranged radially at equal pitches from the outer peripheral surface of the lower extension 23, as shown in FIGS. As shown in FIGS. 3 and 5, each outer vertical rib 40 has a large number of anti-slip holes 8 (perforated holes) penetrating in the horizontal direction in order to transmit the load from the pier lower end 4 to the external concrete 16. Steel plate gibber (PBL) is regularly formed.
- the large number of outer vertical ribs 40 constituting the outer vertical rib group 14 reach the vertical cylinder part 13 and do not reach the wide outer vertical ribs 40 connected to the vertical cylinder part 13 and the vertical cylinder part 13. There is a narrow outer longitudinal rib 40.
- the wide outer vertical ribs 40 are arranged at an equal pitch (for example, 90 ° pitch) in order to appropriately hold the vertical cylinder portion 13.
- the upper end of the inner vertical rib group 15 is connected to the outer edge portion of the lower surface of the diaphragm 20 as shown in FIG. Further, the inner vertical rib group 15 includes a plurality of inner vertical ribs 50 arranged at an equal pitch from the inner peripheral surface of the lower extension 23 toward the axis as shown in FIGS. 4 and 5. Each of the inner vertical ribs 50 has a large number of slip stoppers penetrating in the same horizontal direction as the outer vertical ribs 40 in order to transmit the load from the pier lower end 4 to the inner concrete 17 as shown in FIG. Holes 8 (perforated steel plate gibber: PBL) are regularly formed.
- PBL perforated steel plate gibber
- the outer vertical rib 40 contributes to an increase in the sectional moment than the inner vertical rib 50. Therefore, as shown in FIGS. 4 and 5, the outer vertical rib 40 is larger than the inner vertical rib 50. Designed to be Further, since the outer vertical ribs 40 and the inner vertical ribs 50 cooperate as strength members, all the inner vertical ribs 50 are arranged to face the outer vertical ribs 40 via the lower extension 23.
- the outer concrete 16 embeds the outer longitudinal rib group 14 and the main reinforcing bar 60 from the RC pile 6 as shown in FIGS. 4 and 5.
- the main reinforcing bars 60 are a number of reinforcing bars arranged at equal pitches on the outer edge of the RC pile 6 in order to increase the tensile strength of the RC pile 6.
- the main reinforcing bar 60 is not only disposed inside the RC pile 6 but also protrudes from the pile head 7 of the RC pile 6 to near the upper end of the outer vertical rib group 14. That is, the external concrete 16 receives a tensile load from the outer vertical rib group 14 and transmits this load from the main reinforcing bar 60 to the RC pile 6.
- a band reinforcing bar 61 bound to the main reinforcing bar 60 is also arranged inside the RC pile 6.
- the inner concrete 17 embeds the inner longitudinal rib group 15 as shown in FIG. That is, the internal concrete 17 is a load to which the internal vertical rib group 15 is transmitted.
- the lower concrete 18 embeds the main rebar 60 and the installation stand 68.
- the said lower concrete 18 is designed so that it may damage before the other part of the said rigid structure 10 as a reliability design.
- the rigid structure 10 according to the first embodiment has a larger cross section than the conventional structure having the lower extension portion as a strength member as described in Patent Document 1 as a prior art document. Since it has the next moment, the stress generated when transmitting the load from the pier lower end 4 is reduced.
- the rigid structure 10 includes the outer vertical rib group 14, and as shown in FIGS. 4 and 5, the main reinforcing bar 60 and the strength member (outer vertical rib group 14) from the RC pile 6 are used. Therefore, the tensile force is smoothly transmitted from the outer longitudinal rib group 14 to the main reinforcing bar 60. This suppresses cone breakage caused by tensile force.
- FIGS. 7 and 8 show calculated values and simulations of the stress generated in the rigid structure 10 when a horizontal load F and a vertical load (axial force) are applied to the pier 3.
- Finite element method Finite element method: FEM) value.
- FEM Finite element method
- the calculated value that is, the theoretical value in the case where the steel portion of the rigid structure 10 and the internal concrete 17 cooperate as a unit, Become.
- FEM finite element method
- a stand pipe 91 is built in the ground 5, and the reinforcing bars 60 and 61 of the RC pile 6 are arranged in a hole 92 formed by excavating the stand pipe 91 to a predetermined depth. Then, as shown in FIG. 10, after the concrete of the RC pile 6 is placed in the drilling hole 92, the concrete in the stand pipe 91 is formed with a chisel to complete the RC pile 6 as shown in FIG. 11. . Thereafter, an installation stand 68 is arranged on the pile head 7 of the RC pile 6, and as shown in FIG.
- the steel portion (extension portion 12, vertical cylinder portion 13, outer vertical rib group 14 and The portion comprising the inner vertical rib group 15) is placed on the installation stand 68.
- the stand pipe 91 is removed and backfilled as shown in FIG.
- the rigid structure 10 of the pier lower end portion 4 and the RC pile 6 is manufactured.
- the stress generated when the load from the pier lower end portion 4 is transmitted by the outer vertical rib group 14 embedded in the external concrete 16 is sufficiently small.
- the distance between the main reinforcing bar 60 from the RC pile 6 and the strength member (outer vertical rib group 14) is small and substantially constant, the tensile force is smoothly transmitted from the outer vertical rib group 14 to the main reinforcing bar 60. . Thereby, cone destruction caused by tensile force is suppressed, and as a result, reliability can be improved.
- the lower extension 23 is cylindrical and the outer vertical rib group 14 is composed of a large number of outer vertical ribs 40 arranged radially from the outer surface of the lower extension 23, stress concentration does not occur. It is not necessary to arrange a buffer member for stress distribution between the longitudinal ribs 40, and as a result, manufacturing time and cost can be reduced.
- the outer longitudinal ribs 40 arranged radially at an equal pitch from the outer peripheral surface of the lower extension portion 23 can be further increased (densely). Is possible. Thereby, it is possible to suppress the peeling and stress concentration (support pressure) between the steel plate and the concrete caused by the sudden change in the cross section between the lower extension portion 23 and the vertical cylinder portion 13.
- the rigid structure 100 according to the second embodiment of the present invention is obtained by increasing the number of reinforcing bars embedded in the external concrete 16 of the rigid structure 10 according to the first embodiment.
- the distance between the main reinforcing bar 60 and the outer vertical rib group 14 from the RC pile 6 is small. Cone destruction that tends to occur is suppressed.
- a reinforcing reinforcing bar 62 is provided on the inner peripheral side of the main reinforcing bar 60. 10 shows a rigid structure 100 according to a second embodiment.
- the external concrete 16 of the rigid structure 100 includes the reinforcing bars 62 (inner reinforcing bars) in addition to the outer longitudinal ribs 40 and the main reinforcing bars 60 (a group of outer peripheral reinforcing bars) from the RC pile 6. It is also a buried peri-bar rebar group.
- the reinforcing reinforcing bars 62 are composed of the same number of reinforcing bars as the main reinforcing bars 60, and are disposed closer to the axis than the main reinforcing bars 60. Further, as shown in FIG. 16 of the second embodiment corresponding to FIG. 2 of the first embodiment, the lower part of the reinforcing reinforcing bar 62 is fixed to the main reinforcing bar 60 inside the RC pile 6, and the middle part of the reinforcing reinforcing bar 62 Is inclined from the main reinforcing bar 60 in the direction of the axial center, and the upper part of the reinforcing reinforcing bar 62 protrudes vertically from the pile head 7 of the RC pile 6.
- the lower part of the reinforcing reinforcing bar 62 that is, the part fixed to the main reinforcing bar 60, has a length necessary for transmitting the load from the external concrete 16 to the RC pile 6.
- the middle part of the reinforcing reinforcing bar 62 is inclined so as not to hinder the transmission of the load.
- the upper end of the reinforcing reinforcing bar 62 has the same upper end as the upper end of the main reinforcing bar 60.
- the reinforcing bars of the RC pile 6 arranged in the drilling hole 92 shown in FIG. It is not the thing of the said Example 1 (the main reinforcement 60 and the strip reinforcement 61) but the reinforcement (the main reinforcement 60, the reinforcement reinforcement 62, and the belt reinforcement 61) of the present Example 2.
- the other construction procedure of the second embodiment is the same as the construction procedure of the first embodiment.
- the same effect as that of the rigid structure 10 according to the first embodiment can be obtained. As a result, reliability can be improved.
- bridge pier 3 bridge pier lower end part 4
- pillar support lower end part
- the displacement preventing hole 8 (perforated steel plate gibber: PBL) of the outer longitudinal rib 40 and the inner longitudinal rib 50 has not been described in detail. You may provide a penetration reinforcing bar as a slip prevention member made to do.
- the extension portion 12 has been described as having a cylindrical shape, but may have a rectangular tube shape.
- a buffer member for stress distribution is required, but the manufacturing time and cost are reduced when the pier lower end portion 4 is a rectangular tube shape. Can do.
- the reinforcing reinforcing bars 62 are composed of the same number of reinforcing bars as the main reinforcing bars 60, but it is not always necessary to have the same number.
- the number of reinforcing bars 62 and the diameter of the reinforcing bars are set so as to satisfy the amount of reinforcing bars necessary for suppressing cone fracture.
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Abstract
Description
支柱下端部から下方に延長させて上記コンクリート杭に載置される延長部と、
上記延長部の外面に設けられて多数のずれ止め孔が形成された外縦リブ群と、
上記延長部の外周部に打設された外部コンクリートとを備え、
上記外部コンクリートが、上記コンクリート杭の内部から上方に伸びる鉄筋群と、上記外縦リブ群とを埋設するものである。 In order to solve the above-mentioned problem, a rigid structure according to the first invention is a rigid structure of a lower end portion of a support and a concrete pile,
An extension that extends downward from the lower end of the column and is placed on the concrete pile,
An outer vertical rib group provided on the outer surface of the extension part and formed with a number of anti-slip holes;
With external concrete cast on the outer periphery of the extension,
The external concrete embeds a reinforcing bar group extending upward from the inside of the concrete pile and the outer vertical rib group.
上記延長部の内部に打設された内部コンクリートとを備え、
上記内部コンクリートが、上記内縦リブ群を埋設するものである。 Further, the rigid structure according to the second invention is the rigid structure according to the first invention, the inner vertical rib group provided on the inner surface of the extension portion and formed with a number of detent holes,
An internal concrete placed inside the extension,
The internal concrete embeds the inner vertical rib group.
上記縦筒部が、外部コンクリートを打設する際の型枠となるものである。 Furthermore, the rigid structure according to the third aspect of the invention is the rigid structure according to the first or second aspect of the invention, comprising a vertical cylindrical portion connected to the outer vertical rib group and surrounding the outside of the extension portion,
The said vertical cylinder part becomes a formwork at the time of placing external concrete.
外縦リブ群が、上記延長部の外面から放射状に配置された多数の外縦リブからなるものである。 In addition, in the rigid structure according to the fourth invention, the extension in the rigid structure according to the first or second invention has a cylindrical shape,
An outer vertical rib group consists of many outer vertical ribs arrange | positioned radially from the outer surface of the said extension part.
Claims (5)
- 支柱下端部とコンクリート杭との剛結構造体であって、
支柱下端部から下方に延長させて上記コンクリート杭に載置される延長部と、
上記延長部の外面に設けられて多数のずれ止め孔が形成された外縦リブ群と、
上記延長部の外周部に打設された外部コンクリートとを備え、
上記外部コンクリートが、上記コンクリート杭の内部から上方に伸びる鉄筋群と、上記外縦リブ群とを埋設するものであることを特徴とする支柱下端部とコンクリート杭との剛結構造体。 A rigid structure of the lower end of the column and the concrete pile,
An extension that extends downward from the lower end of the column and is placed on the concrete pile,
An outer vertical rib group provided on the outer surface of the extension part and formed with a number of anti-slip holes;
With external concrete cast on the outer periphery of the extension,
The rigid structure of a pillar lower end and a concrete pile, wherein the external concrete embeds a reinforcing bar group extending upward from the inside of the concrete pile and the outer longitudinal rib group. - 延長部の内面に設けられて多数のずれ止め孔が形成された内縦リブ群と、
上記延長部の内部に打設された内部コンクリートとを備え、
上記内部コンクリートが、上記内縦リブ群を埋設するものであることを特徴とする請求項1に記載の支柱下端部とコンクリート杭との剛結構造体。 An inner longitudinal rib group provided on the inner surface of the extension portion and formed with a number of anti-slip holes;
An internal concrete placed inside the extension,
2. The rigid structure of a column lower end and a concrete pile according to claim 1, wherein the inner concrete embeds the inner vertical rib group. - 外縦リブ群に接続されて延長部の外側を囲う縦筒部を備え、
上記縦筒部が、外部コンクリートを打設する際の型枠となるものであることを特徴とする請求項1または2に記載の支柱下端部とコンクリート杭との剛結構造体。 A vertical cylinder connected to the outer vertical rib group and surrounding the outside of the extension;
The rigid structure of the lower end part of a support | pillar and a concrete pile of Claim 1 or 2 whose said vertical cylinder part becomes a formwork at the time of placing external concrete. - 延長部が、円筒形状であり、
外縦リブ群が、上記延長部の外面から放射状に配置された多数の外縦リブからなることを特徴とする請求項1または2に記載の支柱下端部とコンクリート杭との剛結構造体。 The extension is cylindrical,
The rigidly connected structure of the lower end portion of the column and the concrete pile according to claim 1 or 2, wherein the outer vertical rib group includes a plurality of outer vertical ribs arranged radially from the outer surface of the extension portion. - 外部コンクリートに埋設される鉄筋群が、コンクリート杭を補強する主鉄筋である外周鉄筋群と、コンクリート杭の内部で外周鉄筋群に定着された補強鉄筋である内周鉄筋群とからなることを特徴とする請求項1または2に記載の支柱下端部とコンクリート杭との剛結構造体。 Reinforcing steel bars embedded in external concrete are composed of outer reinforcing steel bars, which are main reinforcing bars for reinforcing concrete piles, and inner reinforcing steel bars, which are reinforcing steel bars fixed to the outer reinforcing steel bars inside the concrete pile. The rigid structure of the support | pillar lower end part and concrete pile of Claim 1 or 2.
Priority Applications (3)
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KR1020177030759A KR102079692B1 (en) | 2015-05-08 | 2016-01-28 | Rigid connection structure for bottom end of pillar and concrete pile |
CN201680026727.4A CN107532398B (en) | 2015-05-08 | 2016-01-28 | Rigid connection structure for lower end of support and concrete pile |
PH12017501821A PH12017501821B1 (en) | 2015-05-08 | 2017-10-04 | Rigid connection structure for bottom end of pillar and concrete pile |
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JP2015095292A JP6021993B1 (en) | 2015-05-08 | 2015-05-08 | Rigid connection structure of lower end of support and concrete pile |
JP2015-095292 | 2015-05-08 |
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JP2018204172A (en) * | 2017-05-30 | 2018-12-27 | 株式会社熊谷組 | Structure of joint between pile and foundation beam |
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CN111691291A (en) * | 2020-07-14 | 2020-09-22 | 中交第一公路勘察设计研究院有限公司 | Steel-concrete combined plate type pier used in central separation belt of overpass bridge and construction method thereof |
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JP6905496B2 (en) * | 2018-09-03 | 2021-07-21 | 東電設計株式会社 | Pile foundation |
CN114150690A (en) * | 2021-11-30 | 2022-03-08 | 西安市政设计研究院有限公司 | Embedded flange for steel column-concrete foundation, connecting structure and construction method |
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PH12017501821A1 (en) | 2018-04-23 |
KR102079692B1 (en) | 2020-02-20 |
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KR20170131604A (en) | 2017-11-29 |
CN107532398B (en) | 2020-08-07 |
PH12017501821B1 (en) | 2018-04-23 |
JP2016211215A (en) | 2016-12-15 |
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