JP6567981B2 - Steel pipe well pier and half precast concrete pier - Google Patents

Description

The present disclosure relates to a steel pipe joint for connecting a pair of steel pipes arranged adjacent to each other, and a steel pipe configured by joining a plurality of steel pipes arranged so as to be continuous in a closed ring shape in plan view. A pair of half precast members that are adjacent to each other by a joint having a tubular structure and a joint having a joint steel pipe and a flat steel plate (a precast concrete member that forms a cast-in-place concrete formwork filled inside and constitutes the outer periphery of the column portion) ) Is connected to a pier of a half precast concrete structure.

  As a structure of a laterally coupled joint of steel pipe sheet piles, both of a pair of joint members joined to the outer peripheral surfaces of adjacent steel pipe sheet piles are so-called C-shaped cross-sectional shapes having slit-like openings in the axial direction. A PP joint, or a so-called PT joint in which one of a pair of joint members has a C-shaped cross section and the other has a T-shaped cross section fitted thereto, and one of the pair of joint members is T A so-called LT joint or the like made of a pair of angle steels having a letter-shaped cross section and disposed so as to form an opening between the other so as to fit the other is known. 1 (see FIG. 8). Such a steel pipe sheet pile joint structure is used for, for example, a steel pipe sheet pile well foundation, and a pair of steel pipe sheet piles are joined by filling the inside of the joint member.

  Further, in the LT joint, in order to improve the shear strength, a plurality of through holes are provided in the flange portion of the joint member having a T-shaped cross section that is a male member, and a pair of L-shaped cross sections that are female members is provided. A joint structure in which a plate-like attachment member is arranged on the outer surface of a steel pipe sheet pile main in a space surrounded by the joint member and a plurality of protrusions are provided on the surface of the attachment member has been proposed (Patent Document 2). reference).

  By the way, a steel pipe is not only used as a sheet pile but also used as a pillar of a pier. As a bridge pier in which the steel pipe is used as the main part of the pillar, a pillar made of a plurality of steel pipe materials standing on a foundation made of steel pipe piles each arranged on a vertex forming a polygon with respect to the ground, and an adjacent pillar What is comprised from the connection member which connects is known (refer patent document 3). The multi-column pier described in Patent Document 3 is configured such that the connecting material includes a low yield point steel material lower than the yield point of the column in order to prevent the column from toppling over.

  In addition to the conventional pile-vented column base structure that is constructed of steel pipes so that multiple steel pipe piles and the same number of steel pipe pillars are connected in the vertical direction, the steel pipe piles are used for connection along the outer axial direction. There has also been proposed a multi-column pier in which joints are fixed and adjacent steel pipe piles are connected to each other by a steel underground wall whose one end is connected to each connection joint (see Patent Document 4). Since the multi-column piers described in Patent Literature 3 and Patent Literature 4 do not need to construct footings, they can be constructed inexpensively and in a short period of time.

JP 2006-257715 A JP 2004-353337 A JP 2005-299080 A JP 2008-303598 A

  However, in the conventional multi-column pier, a plurality of steel pipes are spaced apart from each other, and each steel pipe resists seismic force (lateral force) in an almost independent manner during an earthquake. Therefore, measures such as increasing the number of steel pipes, increasing the rigidity of the connecting members, or increasing the separation distance of the steel pipes along with it, are necessary to increase the earthquake resistance as a whole multi-column pier. The size of the bridge pier in plan view is increased, and the material cost and construction cost are increased.

  Here, the steel pipe sheet pile cantilever foundation used as the foundation of the pier is made small, and each steel pipe is extended to the ground without using a footing and used as a pillar of the pier. It is conceivable to reduce the size and cost. However, even in such a configuration, in order to increase the earthquake resistance of the pier as a whole, high shear strength (shear shear resistance) is required for the connecting portions of the steel pipes arranged adjacent to each other. . However, in the conventional joint structure of steel pipe piles, the shear strength is not yet sufficient, and a joint having a higher shear strength is required.

  In view of such a background, the present invention has a first object to provide a steel pipe joint having high shear strength, and has a steel pipe well structure constituted by a plurality of steel pipes joined by joints having high shear strength. Providing a pier is a second problem. Another object of the present invention is to provide a half-precast concrete pier that can improve workability by diverting a joint structure having high shear strength.

In order to solve the first problem, the present invention provides a steel pipe joint (10) for connecting a first steel pipe (2 _-1 ) and a second steel pipe (2 _-2 ) arranged adjacent to each other. A first joint member (11) joined to the outer peripheral surface of the first steel pipe and extending along the first steel pipe; and joined to the outer peripheral surface of the second steel pipe; And a second joint member (12) extending along the second steel pipe, and the first joint member has an opening (13a) formed at a position facing the second steel pipe. A joint steel pipe (13) having an inner surface that is uneven when viewed in the longitudinal direction of the first steel pipe, and the second joint member has a tip disposed inside the joint steel pipe. A flat steel plate (16) having a flat steel plate and both main surfaces of a portion of the flat steel plate disposed inside the joint steel pipe. And a plurality of protrusions (17) that form a concavo-convex shape in the longitudinal direction of the second steel pipe on both main surfaces, and are filled between the inner surface of the joint steel pipe and the outer surfaces of the flat steel plate and the protrusion. The material (19) is filled.

  According to this configuration, the inner surface of the joint steel pipe is uneven when viewed in the longitudinal direction of the first steel pipe, and the longitudinal direction of the second steel pipe is formed on both main surfaces of the portion disposed inside the joint steel pipe of the flat steel plate. A plurality of protrusions forming a concavo-convex shape is provided, and a filler steel is filled between the inner surface of the joint steel pipe and the flat steel plate and the outer surface of the protrusion, whereby the joint steel pipe joined to the first steel pipe and the second Shear strength with the flat steel plate joined to the steel pipe is increased. In particular, since the opening of the joint steel pipe is formed at a position opposite to the second steel pipe, the opening of the joint steel pipe subjected to the shearing force is prevented from being opened by the second steel pipe when the opening is widened. As a result, the edge cut between the joint steel pipe and the filler does not occur, and shear deviation is prevented, that is, the shear strength is improved.

  Moreover, in said invention, it is good to set it as the structure by which the some protrusion (21) extended in the circumferential direction was formed in the inner surface of the said joint steel pipe (13).

  According to this configuration, since the protrusions extend in a direction intersecting with the direction in which the joint steel pipe and the filler are about to shift, it is possible to effectively suppress edge breakage between the joint steel pipe and the filler. That is, the shear strength of the steel pipe joint can be effectively improved.

  In the above invention, the protrusion (17) may include a stud (25) joined to the main surface of the flat steel plate (16).

  According to this configuration, a protrusion having a large protrusion amount from the main surface of the flat steel plate can be formed relatively easily. And since the protrusion amount of a protrusion from a flat steel plate becomes large, since the bearing surface which conveys a shear force to a filler becomes large, destruction of a filler is suppressed and the shear strength of a steel pipe joint improves.

  In the above invention, the protrusion (17) includes a columnar body (24) inserted into a through hole (16a) formed in the flat steel plate (16) and joined to the flat steel plate. Good.

  According to this configuration, a projection having a large cross section and a large amount of projection from the main surface of the flat steel plate can be formed relatively easily. And by increasing the cross-sectional area of the protrusion and the amount of protrusion, the projected area of the protrusion in the joint extending direction is increased, that is, the bearing surface that transmits the shearing force to the filler is increased, so that the destruction of the filler is suppressed. The shear strength of the steel pipe joint is improved.

  In the above invention, the columnar body (24) may include a steel pipe part (22) and a filling part (23) filled and solidified in the steel pipe part.

  According to this configuration, it is possible to easily and inexpensively form a columnar body having a large cross section. Also, compared to a structure in which the columnar body is formed hollow and the hollow portion is filled with a filler, the columnar body can be formed in a solid form, that is, in a form that does not cause filling leakage due to air accumulation inside, and the shear strength of the columnar body Can be stabilized.

Moreover, in said invention, the said steel pipe joint (10) is joined to the outer peripheral surface of the said joint steel pipe (13) or the outer peripheral surface of the said 2nd steel pipe ( _2-2 ), The said opening (13a of the said steel pipe) ) And a pair of anti-opening steels (14) extending in the longitudinal direction of the joint steel pipe at positions spaced from the opening, and the width of the opening of the joint steel pipe is larger than the thickness of the flat steel plate It is large and it is good to set it as the structure filled with the said filler (19) between the outer surface of the said joint steel pipe and the said 2nd steel pipe between a pair of said opening prevention steel.

  According to this configuration, even when the joint steel pipe is separated from the outer surface of the second steel pipe due to construction errors, the outer surface of the joint steel pipe and the second steel pipe are opened when the joint steel pipe attempts to widen the opening. Since the opening of the joint steel pipe is prevented by the filler filled in between, the shear deviation due to the edge breakage between the joint steel pipe and the filler is surely prevented. That is, the shear strength of the steel pipe joint can be improved more reliably.

  Further, in order to solve the second problem, the present invention is arranged so as to be continuous in a closed ring shape in a plan view, and a base portion (2A) extending in the ground (G) and a column extending on the ground. A steel pipe well structure pier (1) composed of a plurality of steel pipes (2) having a portion (2B), and a pair of steel pipes arranged adjacent to each other, in the foundation part and the column part, It is set as the structure joined mutually by said steel pipe joint (10).

  According to this structure, what adjoins a plurality of steel pipes can be joined with a high shearing force over both the foundation part and the column part, and the earthquake resistance as the whole pier can be greatly improved. it can. And since a pier is comprised by such a steel pipe well structure, a footing can be abbreviate | omitted and the plane dimension of a pier can be made small. In addition, since the foundation portion and the column portion can be constructed by arranging a plurality of steel pipes to be continuous in a closed ring shape in a plan view while engaging a pair of adjacent steel pipes with a steel pipe joint, the material cost of the pier and Construction cost can be reduced.

  Further, in the above invention, filled concrete (8) is filled in at least a part of the plurality of steel pipes (2) so as to extend over the foundation portion (2A) and the column portion (2B). It is good to have a configuration.

  According to this configuration, since the bending strength of the portion where the bending moment in the steel pipe is relatively large is enhanced by the filled concrete, the thickness of the steel pipe can be reduced and the material cost can be reduced.

In order to solve the third problem, the present invention is a pier (31) of a half precast concrete structure having a hollow cross-sectional shape and having a plurality of pillar portions (34) stacked in a vertical direction. The pillar portions are arranged in the circumferential direction in plan view, and are filled in the plurality of half precast members (36) having a hollow cross-sectional shape that constitute the outer peripheral portion of the pillar portions, and the plurality of half precast members. An internal concrete portion (38) made of cast-in-place concrete and a joint (40) provided between a pair of adjacent half precast members, wherein the joint is one of the pair of half precast members (36 _{− 1} ) provided in the first joint member (41) extending vertically and the other of the pair of half precast members ( _36-2 ), A second joint member (42) extending vertically, wherein the first joint member is provided along the outer surface of the one half precast member, and is formed at a position facing the other half precast member. A jointed steel pipe part (43) having a C-shaped cross-sectional shape having an opened opening (43a) and having an inner surface that is uneven when viewed in the vertical direction, and a side opposite to the opening of the jointed steel pipe part And the embedded portion (45) embedded in the one half precast member, and the second joint member is embedded in the tip disposed inside the joint steel pipe portion and the other half precast member. A flat steel plate (46) having a base end and a plurality of main surfaces of the flat steel plate that are disposed inside the joint steel pipe portion, and are formed in a concave and convex shape in the vertical direction on the two main surfaces. And a protrusion (47), the filler (49) is to configurations filled between the inner surface and the flat steel plate and outer surfaces of the projections of the joint steel pipe portion.

  According to this configuration, the inner surface of the joint steel pipe part is uneven when viewed in the vertical direction, and a plurality of concave and convex shapes are formed in the vertical direction on both main surfaces of the portion disposed inside the joint steel pipe part of the flat steel plate. Protrusions are provided, and the filler steel is filled between the inner surface of the joint steel pipe part and the flat steel plate and the outer surface of the protrusions, so that the joint steel pipe part provided in one half precast member and the other half precast member are provided. Shear strength with the flat steel plate made becomes high. In particular, when the opening of the joint steel pipe portion is formed at a position opposite to the other half precast member, the joint steel pipe portion receiving the shearing force is opened by the other half precast member when attempting to open so as to widen the opening. Is prevented, the joint steel pipe portion and the filler are not broken, and shear deviation is prevented, that is, the shear strength is improved. Moreover, a pair of half precast members adjacent to each other can be joined to each other by a joint, and there is no need to connect the reinforcing bars provided in the half precast member, and there is no need to assemble a formwork for the cast-in-place concrete. Therefore, the workability of the bridge pier of the half precast concrete structure can be improved.

  As described above, according to the present invention, a steel pipe joint having a high shear strength, a steel pipe well structure bridge pier constituted by a plurality of steel pipes joined by a joint having a high shear strength, and half precast concrete capable of improving workability Structural piers can be provided.

The front view of the pier of the steel pipe well structure which concerns on 1st Embodiment II-II sectional view in FIG. Part III enlarged view in FIG. IV-IV sectional view in FIG. The perspective view which fractures | ruptures and shows the steel pipe joint shown in FIG. 3 before being filled with a filler. The graph which shows the correlation with the relative displacement displacement and load in the steel pipe joint which concerns on 1st Embodiment, and the PP conventional joint. Sectional drawing equivalent to FIG. 2 of the pier of the steel pipe well structure which concerns on one modification of 1st Embodiment. Sectional drawing equivalent to FIG. 2 of the pier of the steel pipe well structure which concerns on the other modification of 1st Embodiment. Sectional drawing equivalent to FIG. 3 of the steel pipe joint which concerns on the other modification of 1st Embodiment. Front view of pier of half precast concrete structure according to second embodiment XI-XI sectional view in FIG. Sectional drawing equivalent to FIG. 11 of the pier which concerns on the modification of 2nd Embodiment

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<< First Embodiment >>
First, with reference to FIGS. 1-9, the pier 1 of the steel pipe well structure which concerns on 1st Embodiment is demonstrated. FIG. 1 is a front view of a pier 1 having a steel pipe well structure according to a first embodiment. As shown in FIG. 1, the pier 1 includes a plurality of steel pipes 2 (2 ₋₁ to 2) having a foundation portion 2A extending vertically in the ground G and a column portion 2B extending vertically on the ground. _-4 ), and a beam portion 1B constructed integrally at the upper end of the main body portion 1A so as to extend in the direction perpendicular to the bridge axis. The upper structure 3 of the bridge is placed on the beam portion 1B. In this embodiment, the superstructure 3 of the bridge includes a plurality of girders 4 spanned between a pair of piers 1 and 1 adjacent to each other in the bridge axis direction, and a floor slab 5 constructed on the plurality of girders 4. have. The plurality of girders 4 extend in parallel to each other in the bridge axis direction, and the girders 4 adjacent to each other in the direction perpendicular to the bridge axis are connected to each other by a tilting mechanism 6.

  2 is a cross-sectional view taken along the line II-II in FIG. As shown in FIGS. 1 and 2, the pier 1 has a steel pipe well structure in which a plurality of steel pipes 2 constituting the main body 1 </ b> A are arranged in a closed ring shape in a plan view. In the present embodiment, the main body portion 1A of the pier 1 is configured by four steel pipes 2 arranged so as to form a square indicated by an imaginary line in a plan view. Here, making a square means that the center 2X of the steel pipe 2 is located at the apex of the square. The steel pipe 2 may be constituted by a single steel pipe material continuous in the longitudinal direction, or may be constituted by a plurality of steel pipe materials connected in the longitudinal direction via known joints. A pair of steel pipes 2 adjacent to each other along a square side (that is, a line connecting the centers 2X of the pair of steel pipes 2 adjacent to each other) (hereinafter referred to as a steel pipe center line 7) extends over the entire length, that is, the foundation. Both the part 2A and the column part 2B are joined to each other via the steel pipe joint 10.

The steel pipe 2 has a part in the vertical direction across the base portion 2A and the column portion 2B across the boundary portion (surface of the ground G) between the base portion 2A and the column portion 2B where a large bending moment is generated. Filled concrete 8 is filled. In this embodiment, all the steel pipes 2 are filled with filled concrete 8. In another embodiment, the filled concrete 8 may be filled inside some of the steel pipes 2. Such filled concrete 8 is fixed by preliminarily joining a stopper for supporting the hanging frame 9 inside the steel pipe 2 and supporting the hanging frame 9 on the stopper after the steel pipe 2 is built. It can be constructed by placing concrete of a predetermined thickness on top. Hereinafter, the first steel pipe _{2 -1} sequentially clockwise from the upper left of FIG. 2, the second steel pipe _2-2, the third steel pipe _{2 -3,} be described as a fourth steel pipe _{2 -4.}

FIG. 3 is an enlarged view of part III in FIG. Incidentally, FIG. 3 shows a steel pipe joint 10, same structure steel pipe joint 10 between the two other adjacent two steel pipes with each other between the first steel pipe 2 _-1 and the second steel pipe _2-2 It has become. Therefore, here it will be described only steel pipe joint 10 between the first steel pipe _{2 -1} and the second steel pipe _2-2. As shown in FIG. 3, the steel pipe joint 10 is joined to the outer peripheral surface of the first steel pipe 2 _-1, and the first joint member 11 extending vertically along the first steel pipe 2 _-1, the second steel tube It is joined to the outer peripheral surface of the _2-2, and a second coupling member 12 extending vertically along the second steel pipe _2-2 as a main component.

  In addition, as FIG. 2 shows, the 1st joint member 11 or the 2nd joint member 12 is joined to the outer peripheral surface of each steel pipe 2 at two places where a difference angle becomes 90 degree | times. In the present embodiment, one first joint member 11 and one second joint member 12 are joined to each steel pipe 2 in the relatively same arrangement. Thereby, since all the steel pipes 2 become the same shape, construction is easy. In another embodiment, two first joint members 11 are joined to a steel pipe 2, two second joint members 12 are joined to a steel pipe 2 adjacent thereto, and two types of steel pipes 2 are alternately arranged. By doing so, it may be a closed ring.

Returning to FIG. 3, the first joint member 11 has a joint steel pipe 13 having a C-shaped cross-sectional shape having a slit-like opening 13 a extending in the vertical direction. Fitting steel 13 is the arrangement and orientation of the axis is and the opening 13a positioned on the steel tube center line 7 is positioned on the steel tube center line 7 in the first steel pipe 2 _-1 and the side opposite. That is, the joint steel pipe 13 has the opening 13a opposed to the second steel pipe _2-2 . The joint steel pipe 13 is joined to the first steel pipe _2-1 by welding over the entire length of both side portions sandwiching the steel pipe center line 7 on the first steel pipe _2-1 side.

Between the joint steel pipe 13 and the second steel pipe _2-2 , a pair of anti-opening steels 14 is disposed at a position slightly spaced apart from the width of the opening 13a with the second joint member 12 and the opening 13a interposed therebetween. . In the present embodiment, the opening prevention steel 14 is made of round steel and joined to the outer peripheral surface of the second steel pipe _2-2 . In other embodiments, the opening prevention steel 14 may be formed of square steel or flat steel, and may be joined to the outer peripheral surface of the joint steel pipe 13.

Prevention steel 14 opens the pair, when viewed on the direction of the steel pipe centerline 7, than the second steel pipe 2 _-2 (than a point on the steel tube center line 7 of the outer surface of the second steel pipe 2 _-2) first steel pipe It protrudes to the _2-1 side. More say, depending on the second steel pipe 2 _-2 construction accuracy during pile driving, prevent steel 14 opening of the pair is so as to contact the outer peripheral surface of the joint steel pipe 13, or the distance between the joint steel pipe 13 as There consisting distance (distance between the outer peripheral surfaces of the pair of edge portions and the second steel pipe 2 _-2 forming the opening 13a of the joint steel pipe 13) smaller than of the second steel pipe _2-2 and the joint steel pipe 13 In addition, the arrangement and cross-sectional dimensions are determined. Thereby, a gap g is formed between the joint steel pipe 13 and the second steel pipe _2-2 .

The second joint member 12 has a thickness smaller than the width of the opening 13 a of the joint steel pipe 13, and a proximal end joined to the outer peripheral surface of the second steel pipe _2-2 and a tip disposed inside the joint steel pipe 13. And a cylindrical protrusion 17 provided so as to protrude from both main surfaces at a portion of the flat steel plate 16 disposed inside the joint steel pipe 13. The flat steel plate 16 has a base end and a distal end located on the steel pipe center line 7, that is, a method of passing through the outer peripheral surface of the second steel pipe _2-2 from the position closest to the first steel pipe _2-1. It arrange | positions so that it may protrude along a line. The flat steel plate 16 is joined to the second steel pipe _2-2 by welding over both sides of the base end over the entire length.

A filler 19 is filled and solidified between the inner surface of the joint steel pipe 13 and the outer surfaces of the flat steel plate 16 and the protrusion 17. Thereby, the 1st joint member 11 and the 2nd joint member 12 are integrated, and the 1st steel pipe _2-1 and the 2nd steel pipe _2-2 are joined mutually. Further, since the gap g is formed between the joint steel pipe 13 and the second steel pipe _2-2 , the filler 19 is outside the joint steel pipe 13, that is, at least between the pair of opening prevention steels 14 (a pair of opening steels). The portion surrounded by the outer peripheral surface of the prevention steel 14 and the second steel pipe _{2-2 and} the outer peripheral surface of the joint steel pipe 13 is also filled.

  4 is a cross-sectional view taken along the line IV-IV in FIG. 3, and FIG. 5 is a perspective view showing the steel pipe joint 10 before being filled with the filler 19. As shown in FIGS. 4 and 5, a plurality of protrusions 21 extending in the circumferential direction are provided on the inner surface of the joint steel pipe 13 along the vertical direction. In the present embodiment, the protrusion 21 has a substantially isosceles triangular cross-sectional shape and is provided so as to be continuous in the vertical direction. In other embodiments, the protrusion 21 may have a triangular cross-sectional shape such as a regular triangle or a saw blade shape, or a quadrangular cross-sectional shape such as a trapezoid or a rectangle, and may be spiral (inclined with respect to the horizontal plane). May be extended). By forming such protrusions 21, the inner surface of the joint steel pipe 13 is uneven when viewed in the vertical direction (hereinafter referred to as "along the vertical direction"). The protrusion 21 functions as a displacement prevention unit that prevents a displacement of the joint steel pipe 13 and the filler 19 in the vertical direction after the filler 19 is filled into the joint steel pipe 13. The joint steel pipe 13 having the above-described structure has an opening 13a after the protrusion 21 is formed on one surface of the steel plate by a known method or after the steel sheet is manufactured so that the protrusion 21 is formed on one surface during rolling. It can be formed by bending a steel plate into an arc shape that forms. In the present embodiment, since the protrusions 21 are formed on the entire inner surface of the joint steel pipe 13, the inner surface of the joint steel pipe 13 is uneven along the vertical direction in any longitudinal section in the circumferential direction. Only a part of the inner surface of the steel pipe 13 may be uneven along the vertical direction.

  The protrusion 17 constituting the second joint member 12 has a steel pipe part 22 having an axial length larger than the width of the opening 13a of the joint steel pipe 13, a high-strength mortar filled inside the steel pipe part 22 without gaps, and solidified. It is formed by the columnar body 24 comprised by the filling part 23 which consists of. Since the columnar body 24 configured in this manner has the filling portion 23 constrained by the steel pipe portion 22, the shear strength in the direction perpendicular to the axis is large, and the plastic deformation until fracture is large. The columnar body 24 is integrated with the flat steel plate 16 by being welded to the flat steel plate 16 at the center in the longitudinal direction of the steel pipe portion 22 while being inserted into the through hole 16 a formed in the flat steel plate 16. As a result, a pair of protrusions 17 that protrude evenly from both main surfaces of the flat steel plate 16 and engage with the joint steel pipe 13 are formed.

  In this embodiment, the columnar body 24 is formed in a cylindrical shape by the steel pipe portion 22 having a circular cross section, and the through hole 16a of the flat steel plate 16 is also formed in a circular cross section. In another embodiment, the columnar body 24 may be formed in a prismatic shape by a square steel pipe having a square cross section. In this case, the through hole 16a formed in the flat steel plate 16 also has a square cross section. Alternatively, the columnar body 24 may be formed by cutting a solid steel material such as round steel or square steel, or a relatively thick cylindrical steel material into a predetermined length.

  A plurality of through holes 16 a are formed in the flat steel plate 16 at predetermined intervals along the vertical direction, and a plurality of columnar bodies 24 corresponding to the number of the through holes 16 a are joined to the flat steel plate 16. Thereby, on both the main surfaces of the flat steel plate 16, an uneven shape is formed in the vertical direction (along the vertical direction) by the plurality of protrusions 17. The columnar body 24 functions as a guided portion that engages with the joint steel pipe 13 when the steel pipe 2 is built and piled, and after the filler 19 is filled in the joint steel pipe 13, It functions as a displacement prevention unit that prevents a vertical displacement from the joint member 12.

  FIG. 6 shows the load in the steel pipe joint 10 according to the present embodiment and a PP-type conventional joint using a slitted steel pipe having the same thickness as the portion of the joint steel pipe 13 where the protrusions 21 are not provided. It is a graph which shows the relationship between and relative displacement displacement. As shown in FIG. 6, the steel pipe joint 10 according to the present embodiment has a higher yield load than the conventional joint, and the support load (displacement resistance force) increases after the yield, and the ultimate load is higher than the yield load. It is getting bigger.

Thus steel pipe joint 10 according to this embodiment, a steel pipe joint 10 is high resistance to shear forces which the first steel pipe 2 _-1 and the second steel pipe 2 _-2 adjacent to it Zureyo vertically Demonstrate.

Specifically, in the steel pipe joint 10 according to the present embodiment, as shown in FIG. 4, the inner surface of the joint steel pipe 13 is uneven along the vertical direction, and is arranged inside the joint steel pipe 13 of the flat steel plate 16. A plurality of protrusions 17 that form an uneven shape along the vertical direction are provided on both main surfaces of the portion, and a filler 19 is filled between the inner surface of the joint steel pipe 13 and the outer surfaces of the flat steel plate 16 and the protrusion 17. . Therefore, the shear strength of the joint steel pipe 13 which is joined to the first steel pipe 2 _-1 and the flat steel plate 16 bonded to the second steel pipe 2 _-2 is increased.

In particular, as shown in FIG. 3, since the opening 13a of the joint steel pipe 13 is formed at a position facing the second steel pipe _2-2 , the joint steel pipe 13 that has received a shearing force is opened so as to widen the opening 13a. At this time, the opening is blocked by the second steel pipe _2-2 . Thereby, the edge break | disconnection of the joint steel pipe 13 and the filler 19 does not arise, but shear strength improves by preventing shear shift | offset | difference.

  Further, as shown in FIG. 5, a plurality of protrusions 21 extending in the circumferential direction are formed on the inner surface of the joint steel pipe 13. That is, the protrusion 21 is formed so as to extend in a direction intersecting (orthogonal in this embodiment) with the direction in which the joint steel pipe 13 and the filler 19 are about to be displaced. Therefore, the edge cut | disconnection of the joint steel pipe 13 and the filler 19 is suppressed effectively, and the shear strength of the steel pipe joint 10 improves effectively.

  As shown in FIG. 4, the protrusion 17 includes a columnar body 24 inserted into a through hole 16 a formed in the flat steel plate 16 and joined to the flat steel plate 16. Therefore, the protrusion 17 having a large cross section and a large amount of protrusion from the main surface of the flat steel plate 16 can be formed relatively easily. Further, the projection area of the protrusion 17 in the joint extending direction is increased by the increase in the cross-sectional area and the protrusion amount of the protrusion 17, that is, the bearing surface that transmits the shearing force to the filler 19 is increased, thereby breaking the filler 19. Is suppressed, and the shear strength of the steel pipe joint 10 is improved.

  In addition, the columnar body 24 includes a steel pipe part 22 and a filling part 23 that is filled and solidified inside the steel pipe part 22. Therefore, the columnar body 24 having a large cross section can be easily and inexpensively formed. If the columnar body 24 is formed in a hollow shape and the filler 19 is filled into the hollow portion of the columnar body 24 when the filler steel 19 is filled with the filler 19, the columnar body 24 extends horizontally. Therefore, air easily collects in the columnar state. On the other hand, in this embodiment, since the filling portion 23 is filled in the steel pipe portion 22 in advance, the columnar body 24 is solid, i.e., there is no filling leakage due to air accumulation in the inside as compared with the temporary configuration. Thus, the shear strength of the columnar body 24 is stabilized.

As shown in FIG. 3, the steel pipe joint 10 is joined to the outer peripheral surface of the second steel pipe _2-2 and extends at a position spaced from the opening 13 a across the opening 13 a of the joint steel pipe 13 in the longitudinal direction of the joint steel pipe 13. A pair of anti-opening steels 14 is further provided, the width of the opening 13a of the joint steel pipe 13 is larger than the thickness of the flat steel plate 16, and the outer surface of the joint steel pipe 13 and the second steel pipe 2 between the pair of anti-opening steels 14. _-2 is filled with the filler 19. Therefore, even if the joint steel pipes 13 for construction errors are spaced from the outer surface of the second steel pipe _2-2, when the coupling steel pipe 13 attempts to open so as to widen the opening 13a, the outer surface and the second joint steel pipe 13 Opening of the joint steel pipe 13 is prevented by the filler 19 filled between the steel pipe _2-2 . Thereby, the shear shift | offset | difference by the edge cut | disconnection of the joint steel pipe 13 and the filler 19 is prevented reliably, and the shear strength of the steel pipe joint 10 improves more reliably.

  As shown in FIGS. 1 and 2, the plurality of steel pipes 2 arranged so as to be continuous in a closed ring shape in a plan view are formed in both the base portion 2 </ b> A and the column portion 2 </ b> B by the steel pipe joint 10 having the above configuration. Are joined together. Therefore, the adjacent ones of the plurality of steel pipes 2 are joined with a high shearing force over both the foundation portion 2A and the column portion 2B, and the earthquake resistance as the pier 1 as a whole is greatly improved. In addition, in the example of illustration, although the steel pipe joint 10 of the said structure is provided over the full length (the whole of a height direction) of 2 A of foundation parts of the steel pipe 2, and the column part 2B, the steel pipe joint 10 is the foundation part 2A. It may be provided over a part and the entire length of the column part 2B, or may be provided on a part of the base part 2A and a part of the column part 2B (preferably a large part). Furthermore, when the pier 1 is configured with such a steel pipe well structure, the foundation footing can be omitted, and the planar size of the pier 1 is reduced. Accordingly, it is easy to carry out construction in urban areas where it is difficult to secure a construction yard. Further, the base portion 2A and the column portion 2B are constructed by arranging a plurality of steel pipes 2 so as to be continuous in a closed ring shape in a plan view while engaging a pair of adjacent steel pipes 2 with a steel pipe joint 10. The material cost and construction cost of the pier 1 are reduced.

  In addition, filled concrete 8 is filled in at least some of the plurality of steel pipes 2 so as to extend between the base portion 2A and the column portion 2B. Therefore, the bending strength of the portion where the bending moment in the steel pipe 2 becomes relatively large is enhanced by the filling concrete 8. Thereby, it is possible to reduce the material cost by reducing the thickness of the steel pipe 2.

  FIG. 7 is a cross-sectional view corresponding to FIG. 2 in a steel pier 1 having a steel tubular well structure according to a modification of the first embodiment. In the pier 1 of this modified example, the six steel pipes 2 constituting the main body 1A are arranged in two rows in the bridge axis direction and three rows in the direction perpendicular to the bridge axis in plan view so as to be continuous in a rectangular closed ring. Has been placed. The steel pipe 2 arranged at the center in the direction perpendicular to the bridge axis is located at the center of the long side of the rectangle indicated by the imaginary line. The six steel pipes 2 are connected in a closed ring shape by six steel pipe joints 10 arranged along the outer periphery of the rectangle, and the two steel pipes 2 are arranged inside the rectangle, that is, in the center in the direction perpendicular to the bridge axis. It connects so that a closed cross section may be partitioned off by the steel pipe joint 10 arrange | positioned between.

  That is, the 1st joint member 11 or the 2nd joint member 12 is joined to the two steel pipes 2 arrange | positioned in the center of a bridge axis perpendicular direction at three places. Therefore, the main body 1A of the pier 1 includes a first-shaped steel pipe 2 disposed at the top of the rectangle, a second-shaped steel pipe 2 disposed on one long side of the rectangle, and the other long side of the rectangle. It is comprised by three types of steel pipes 2 including the 3rd-shaped steel pipe 2 arrange | positioned on the top.

  In another modification, the steel pipe joint 10 is not arranged between the two steel pipes 2 arranged at the center in the direction perpendicular to the bridge axis, and the six steel pipes are arranged along the outer circumference of the rectangle. The joint 10 may be connected in a closed ring shape only.

  FIG. 8 is a cross-sectional view corresponding to FIG. 2 in a pier 1 having a steel pipe well structure according to another modification of the first embodiment. In the pier 1 of this modification, the eight steel pipes 2 constituting the main body 1A are arranged so as to be continuous in a square closed ring of three rows in the bridge axis direction and three rows in the bridge axis perpendicular direction in a plan view. Yes. Accordingly, the main body portion 1A of the pier 1 has two types of steel pipes 2 including a steel pipe 2 having a first shape arranged at the top of a rectangle and a steel pipe 2 having a second shape arranged on a square side. Consists of.

  In another modification, the steel pipe 2 is also arranged at the center of gravity of the square, and the four steel pipes 2 (squares) adjacent to each other in the bridge axis direction and the direction perpendicular to the bridge axis so that the steel pipe 2 (not shown) partitions the square into four squares. The steel pipe joint 10 may be connected to four steel pipes 2) arranged on the sides of the steel pipe.

  In still another modification, the two steel pipes 2 arranged on the two sides in the bridge axis direction or the two steel pipes 2 arranged on the two sides in the direction perpendicular to the bridge axis are shifted to the outside. The four steel pipes 2 arranged on the four sides may be displaced outwardly, and may be arranged continuously so as to form an oval (exactly, a hexagon having a long pair of opposing sides). It may be arranged in a continuous position so as to form a circle (precisely, an octagon).

  FIG. 9 is a cross-sectional view corresponding to FIG. 3 in a steel pipe joint 10 according to another modification of the first embodiment. In the steel pipe joint 10 of this modified example, the protrusion 17 constituting the second joint member 12 is formed by the stud 25. In the example of illustration, the four studs 25 are joined by welding to both main surfaces of the part arrange | positioned inside the joint steel pipe 13 of the flat steel plate 16. The stud 25 has a cylindrical shape and is provided at a predetermined interval in the vertical direction. The studs 25 may be arranged in a line in the vertical direction, or may be arranged shifted in the protruding direction of the flat steel plate 16. By providing the studs 25 in this way, uneven shapes are formed on both main surfaces of the flat steel plate 16. In another modification, the stud 25 may be provided together with the columnar body 24.

  As described above, since the protrusion 17 includes the stud 25 joined to the main surface of the flat steel plate 16, the protrusion 17 having a large protrusion amount from the main surface of the flat steel plate 16 can be formed relatively easily. And since the bearing amount surface which conveys a shear force to the filler 19 becomes large because the protrusion amount of the protrusion 17 from the flat steel plate 16 becomes large, destruction of the filler 19 is suppressed and the shear strength of the steel pipe joint 10 is improved. To do.

<< Second Embodiment >>
Next, a pier 31 having a half precast concrete structure according to the second embodiment will be described with reference to FIGS. In addition, the code | symbol which has the same or the last one digit common is attached | subjected to the element which is the same as that of 1st Embodiment, or a form or a function, and the overlapping description is abbreviate | omitted suitably.

  FIG. 10 is a front view of a bridge pier 31 having a half precast concrete structure according to the second embodiment. As shown in FIG. 10, the pier 31 has a foundation 32 constructed on the ground G and a pier body 33 constructed on the foundation 32. The foundation 32 has at least a footing 32a. The foundation 32 may have a foundation pile (not shown) and a footing 32a. The bridge pier body 33 includes a pillar portion 33A constructed on the footing 32a and a beam portion 33B constructed integrally so as to extend in the direction perpendicular to the bridge axis at the upper end of the pillar portion 33A. 33 A of pillar parts are comprised by the some pillar part 34 constructed | assembled so that it may accumulate in a perpendicular direction. The superstructure 3 of the bridge is placed on the beam portion 33B. In another embodiment, the bridge pier body 33 does not have the beam portion 33B, and the upper structure 3 of the bridge may be placed on the column portion 33A.

  11 is a cross-sectional view taken along the line XI-XI in FIG. As shown in FIGS. 10 and 11, the pillar portion 33 </ b> A of the pier 31 has a hollow (closed annular) cross-sectional shape in at least an intermediate portion excluding the lowermost step and the uppermost step. The column portions 34 arranged in the hollow cross section are arranged in the circumferential direction along the outer contour in plan view, and a plurality of half precast members 36 made of precast concrete having a hollow cross sectional shape, and a plurality of half precast members 36 It has an internal concrete portion 38 made of cast-in-place concrete filled inside, and a joint 40 provided between a pair of half precast members 36 adjacent to each other in the circumferential direction.

In the present embodiment, two half precast members 36 having a hollow cross-sectional shape having a U-shape are arranged to face each other with their openings facing each other, and are connected to each other by two joints 40 arranged between the respective one end portions. Thus, a closed cross section (hollow cross section) shape is formed. Hereinafter, the half precast member 36 disposed on the left side of FIG. 11 is a first half precast member 36 _-1, explaining Precast members 36 disposed on the right side as the second half precast member 36 _-2.

The two joints 40 have the same configuration. Therefore, description will be given here based on the upper joint 40 of FIG. Joint 40 is provided in the first half precast member _{36 -1,} the first joint member 41 extending vertically, provided in the second half precast member _{36 -2} second coupling member extending vertically 42 As the main element. The first joint member 41 and the second joint member 42 have the same length (height) as the height of the half precast member 36. The first joint members 41 and the second joint members 42 stacked in the vertical direction are connected to each other in the longitudinal direction via a known joint structure.

The first joint member 41 is provided along the outer surface of the first half precast member 36 _-1, the C-shaped cross section having a second Precast members 36 _-2 formed on opposite positions on the opening 43a the joint steel pipe section 43 exhibits, is joined to the opposite side to the opening 43a of the coupling steel pipe 43, and a buried portion 45 buried in the first half precast member 36 _-1. In this embodiment, the distal end of the embedded portion 45 is located in the hollow portion of the first half precast member 36 _-1, which is also buried inside the concrete section 38. A plurality of protrusions 21 (see FIG. 5) extending in the circumferential direction are formed on the inner surface of the joint steel pipe portion 43. Thereby, the inner surface of the joint steel pipe part 43 is uneven | corrugated along the perpendicular direction.

The joint steel tube 43 between the second half precast member 36 _-2, prevention unit 44 opens the pair at a position slightly spaced from the respective opening 43a across the aperture 43a is disposed. In the present embodiment, prevention portion 44 opening is formed by flat steel, so as to protrude from the end face of the first half precast member 36 _-1 of the second half precast member 36 ₂ (gable end face), the second half It is embedded in the precast member _{36 -2.} In another embodiment, prevention portion 44 opens may be formed by square steel or round steel may be joined to the outer peripheral surface of the joint steel tube portion 43, the outer surface of the second half precast member 36 _-2 by concrete May be integrally formed.

The pair of opening preventing portions 44 are in contact with the outer surface of the joint steel pipe portion 43, or are separated from the outer surface of the joint steel pipe portion 43 by the joint steel pipe portion 43 (more specifically, the opening 43a of the joint steel pipe portion 43 is formed. arranged and dimensioned so as to be smaller than the distance between the pair of edges) and the second half precast member 36 _-2 to is determined. That is, the pair of opening preventing portion 44 projects from the gable end face of the second half precast member 36 _-2 direction perpendicular thereto, the joint steel tube section 43 (the opening 43a by abutting the outer surface of the coupling steel pipe 43 The edge part to be formed is prevented from coming into contact with the end face on the wife side. Thus, between the joint steel pipe portion 43 and the second half precast member 36 _-2 gap g (see FIG. 3) are formed.

The second joint member 42 includes a flat steel plate 46 having a distal end disposed inside the joint steel pipe portion 43 and a base end embedded in the second half precast member _36-2 , and the inside of the joint steel pipe portion 43 of the flat steel plate 46. And a plurality of protrusions 47 that form concave and convex shapes along the vertical direction on both main surfaces. The flat steel plate 46 has a thickness smaller than the width of the opening 43 a of the joint steel pipe portion 43. In this embodiment, the proximal end of the flat steel plate 46 located in the hollow portion of the second half precast member 36 _-2, which is also buried inside the concrete section 38.

A filler 49 is filled and solidified between the inner surface of the joint steel pipe portion 43 and the outer surfaces of the flat steel plate 46 and the protrusion 47. Thus, the first joint member 41 and the second joint member 42 are integrated, the first half precast member _{36 -1} and the second half precast member _{36 -2} are joined together. Also, prevention since the gap g (FIG. 3) is formed, the filler 49 outside the joint steel pipe section 43, i.e., at least a pair of opening between the joint steel pipe portion 43 and the second half precast member 36 _-2 also between parts 44 (outer surface and a portion surrounded by the outer peripheral surface of the joint steel tube portion 43 between the pair of opening preventing portion 44 second precast members 36 _-2) is filled.

  The protrusions 47 constituting the second joint member 42 are filled and solidified without gaps in the steel pipe part 22 (FIG. 4) having an axial length larger than the width of the opening 43 a of the joint steel pipe part 43. It is formed by the columnar body 24 (FIG. 4) comprised by the filling part 23 (FIG. 4) which consists of high strength mortar etc. which were made. The columnar body 24 is inserted into each of a plurality of through holes formed in the flat steel plate 46 so as to be aligned in the vertical direction, and the center portion in the longitudinal direction of the steel pipe portion 22 is inserted into the flat steel plate 46 in a state of being inserted into the through holes. The flat steel plate 46 is integrated by welding. Thereby, both the main surfaces of the flat steel plate 46 are formed in a concavo-convex shape along the vertical direction by the plurality of protrusions 47.

  The protrusion 21 (FIG. 5) formed on the inner surface of the joint steel pipe portion 43 causes the vertical shift between the joint steel pipe portion 43 and the filler 49 after the filler 49 is filled in the joint steel pipe portion 43. It functions as a displacement prevention unit for preventing. The columnar body 24 functions as a guided portion that engages with the joint steel pipe portion 43 when the half precast member 36 is disposed, and after the filler 49 is filled in the joint steel pipe portion 43, the filler 49 and the second joint It functions as a displacement prevention unit that prevents the displacement of the member 42 in the vertical direction.

The pier 31 of the half precast concrete structure configured as described above can obtain the following operational effects. That is, as shown in FIG. 11, the inner surface of the joint steel pipe portion 43 is uneven along the vertical direction, and the both main surfaces of the portion disposed inside the joint steel pipe portion 43 of the flat steel plate 46 are along the vertical direction. A plurality of projections 47 that form an uneven shape are provided, and a filler 49 is filled between the inner surface of the joint steel pipe portion 43 and the outer surfaces of the flat steel plate 46 and the projection 47. Therefore, the shear strength of the flat steel plate 46 and the joint steel tube portion 43 provided in the first half precast member 36 _-1 provided in the second half precast member 36 _-2 increases.

In particular, when the opening 43a of the joint steel pipe portion 43 is formed at a position facing the second half precast member _36-2 , the joint steel pipe portion 43 that has received a shearing force tries to open so as to widen the opening 43a. It is prevented opening the second half precast member _{36 -2.} Thereby, the edge break | disconnection of the joint steel pipe part 43 and the filler 49 does not arise, but shear strength improves by preventing shear shift | offset | difference. Moreover, a pair of adjacent half precast members 36 can be joined to each other by a joint 40, and it is not necessary to connect reinforcing bars provided in the half precast member 36, and a formwork is assembled for on-site concrete. Since it is not necessary, the workability of the pier 31 having a half precast concrete structure can be improved.

  The effect by the protrusion 21, the effect by the columnar body 24, and the effect by the opening prevention part 44 are the same as that of the protrusion 21, the columnar body 24, and the opening prevention steel 14 of 1st Embodiment. Also in this embodiment, the stud 25 (see FIG. 9) may be joined to the flat steel plate 46 together with the columnar body 24 or in place of the columnar body 24, as in the first embodiment.

  FIG. 12 is a cross-sectional view corresponding to FIG. 11 in a pier 31 of a half precast concrete structure according to a modification of the second embodiment. In the bridge pier 31 of this modified example, the column portion 34 constituting the column portion 33A has four half precast members 36 arranged in the circumferential direction along the outer contour in plan view, and four joints 40. Yes. In the illustrated example, the column portion 34 has a square cross-sectional shape by four half precast members 36. The four half precast members 36 each have a corner portion, and have the same L-shape with the same dimensions in the bridge axis direction and the bridge axis perpendicular direction.

  In another example, the four half precast members 36 may form corners and have the same flat shape that is long in the direction of the bridge axis or in the direction perpendicular to the bridge axis. Alternatively, the four half precast members 36 have an arc shape, a straight shape, or a shape including a straight portion and an arc portion, and the four half precast members 36 have a cross-sectional shape such as a circle, an ellipse, or an ellipse. May be. Further, the column portion 34 may have three or five or more half precast members 36.

  Alternatively, in the column portion 34 shown in FIGS. 11 and 12, a plurality of joints 40 may be provided in parallel between a pair of half precast members 36 adjacent to each other in the circumferential direction.

  Although the description of the specific embodiment is finished as described above, the present invention is not limited to the above-described embodiment, and can be widely modified without departing from the spirit of the invention. In addition, all the constituent elements shown in the above embodiment are not necessarily essential, and can be appropriately combined or selected.

1 Pier (steel pipe well structure)
2 steel pipe 2 _-1 first steel pipe _2-2 second steel pipe 2A foundation 2B pillar portion 8 of packed concrete 10 Steel Pipe joint 11 first joint member 12 and the second joint member 13 joint steel pipe 13a opening 14 opening preventing steel 16 flat steel plate 16a Through hole 17 Protrusion 19 Filler 21 Projection 22 Steel pipe part 23 Filling part 24 Columnar body 25 Stud 31 Bridge pier (half precast concrete structure)
34 Column part 36 Half precast member 38 Internal concrete part 40 Joint 41 First joint member 42 Second joint member 43 Joint steel pipe part 43a Opening 44 Opening prevention part 45 Buried part 46 Flat steel plate 47 Protrusion 49 Filler g Gap G Ground

Claims (7)

It is a bridge pier of a steel pipe tubular structure that is arranged so as to be continuous in a closed ring shape in a plan view, and is composed of a plurality of steel pipes each having a foundation part extending into the ground and a pillar part extending to the ground,
Each pair of steel pipes composed of a first steel pipe and a second steel pipe arranged adjacent to each other are joined to each other by a steel pipe joint in the foundation part and the column part,
The steel pipe joint is
A first joint member joined to the outer peripheral surface of the first steel pipe and extending along the first steel pipe;
A second joint member joined to the outer peripheral surface of the second steel pipe and extending along the second steel pipe;
The first joint member has a C-shaped cross-sectional shape having an opening formed at a position facing the second steel pipe, and has an inner surface that is uneven when viewed in the longitudinal direction of the first steel pipe. Including jointed steel pipes,
The second joint member is provided on both main surfaces of a flat steel plate having a tip disposed inside the joint steel pipe and a portion of the flat steel plate disposed inside the joint steel pipe. A plurality of protrusions that form an uneven shape in the longitudinal direction of the second steel pipe,
Filler is filled between the inner surface of the joint steel pipe and the outer surface of the flat steel plate and the protrusion ,
Concrete is not placed around and inside the pillar portions of the plurality of steel pipes, and filled concrete is filled in each of the plurality of steel pipes so as to extend between the foundation portion and the pillar portions. Steel pipe well structure pier characterized by being made . The steel pipe well structure pier according to claim 1, wherein a plurality of protrusions extending in the circumferential direction are formed on an inner surface of the joint steel pipe. The steel pipe well structure pier according to claim 1 or 2, wherein the protrusion includes a stud joined to a main surface of the flat steel plate. The said pipe | tube protrusion is inserted in the through-hole formed in the said flat steel plate, The columnar body joined to the said flat steel plate is included, The steel pipe well structure of any one of Claims 1-3 characterized by the above-mentioned. The pier . 5. The pier having a steel pipe well structure according to claim 4, wherein the columnar body includes a steel pipe part and a filling part filled and solidified in the steel pipe part. A pair of anti-opening steels joined to the outer peripheral surface of the joint steel pipe or the outer peripheral surface of the second steel pipe and extending in the longitudinal direction of the joint steel pipe at a position spaced from the opening across the opening of the joint steel pipe Further comprising
The width of the opening of the joint steel pipe is larger than the thickness of the flat steel plate, and the filler is filled between the outer surface of the joint steel pipe and the second steel pipe between the pair of opening prevention steels. A bridge pier having a steel pipe well structure according to any one of claims 1 to 5. A pier of a half precast concrete structure having a hollow cross-sectional shape and having a plurality of pillar portions stacked in a vertical direction,
Each pillar portion, arranged in the circumferential direction in plan view, constituting the outer peripheral portion of the pillar portion, each of the internal and multiple Precast members each having a hollow closed cross-sectional shape, said plurality of Precast members An internal concrete portion made of cast-in-place concrete filled in, and a joint provided between a pair of half precast members adjacent to each other,
The joint is
A first joint member provided on one of the pair of half precast members and extending vertically;
A second joint member provided on the other of the pair of half precast members and extending vertically;
The first joint member is provided along the outer surface of the one half precast member and exhibits a C-shaped cross-sectional shape having an opening formed at a position facing the other half precast member, and in the vertical direction. A joint steel pipe portion having an inner surface that is uneven when viewed with respect to, and a buried portion that is bonded to the side opposite to the opening of the joint steel pipe portion and is buried in the one half precast member,
The second joint member is disposed inside the joint steel pipe portion of the flat steel plate having a distal end disposed inside the joint steel pipe portion and a base end embedded in the other half precast member. Including a plurality of protrusions that are formed on both main surfaces of the portion, and that form a concavo-convex shape in the vertical direction on both the main surfaces,
A bridge pier having a half precast concrete structure, wherein a filler is filled between an inner surface of the joint steel pipe portion and an outer surface of the flat steel plate and the protrusion.

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