WO2010146836A1 - Structure for connecting steel pipe sheet piles, and steel pipe sheet pile structure - Google Patents

Structure for connecting steel pipe sheet piles, and steel pipe sheet pile structure Download PDF

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Publication number
WO2010146836A1
WO2010146836A1 PCT/JP2010/003971 JP2010003971W WO2010146836A1 WO 2010146836 A1 WO2010146836 A1 WO 2010146836A1 JP 2010003971 W JP2010003971 W JP 2010003971W WO 2010146836 A1 WO2010146836 A1 WO 2010146836A1
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Prior art keywords
steel pipe
pipe sheet
shaped member
pair
shaped
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PCT/JP2010/003971
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French (fr)
Japanese (ja)
Inventor
岩村栄世
村井健二
永嶋聡志
青柳孝義
Original Assignee
新日本製鐵株式会社
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Application filed by 新日本製鐵株式会社 filed Critical 新日本製鐵株式会社
Priority to AU2010261247A priority Critical patent/AU2010261247B2/en
Priority to CN201080026593.9A priority patent/CN102803615B/en
Publication of WO2010146836A1 publication Critical patent/WO2010146836A1/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02—Sheet piles or sheet pile bulkheads
    • E02D5/03—Prefabricated parts, e.g. composite sheet piles
    • E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel

Definitions

  • the present invention relates to a steel pipe sheet pile connection structure for connecting steel pipe sheet piles to each other, and a structure using the connection structure.
  • a steel pipe sheet pile foundation is constructed by connecting a plurality of steel pipe sheet piles.
  • the steel pipe sheet piles are generally connected by so-called PP type joining in which pipes with slits provided on the outer surfaces of adjacent steel pipe sheet piles are fitted together and joined.
  • the pair of L-shaped steel materials are provided on the first steel pipe sheet pile so as to face each other inward, and the pair of L-shaped steel sheets are provided on the second steel pipe sheet pile.
  • the steel materials are provided so as to face each other.
  • a 1st steel pipe sheet pile and a 2nd steel pipe sheet pile are connected by a pair of outward L type steel materials being fitted by a pair of inward L type steel materials.
  • rod-shaped steel materials are provided between the respective L-shaped steel materials.
  • This invention is made in view of such a problem, and it aims at providing the steel pipe sheet pile joint which has high shear strength, is simple in structure, is excellent in connection workability
  • a first aspect of the present invention is a connection structure between steel pipe sheet piles, and a pair of first L-shaped members joined inward to each other on the side of the first steel pipe sheet pile, A pair of second L-shaped members that are provided on the side of the second steel pipe sheet pile adjacent to the first steel pipe sheet pile so as to face the first L-shaped member, and are joined outward. It comprises.
  • the pair of second L-shaped members are disposed inside the pair of first L-shaped members, and are surrounded by the pair of first L-shaped members and the pair of second L-shaped members.
  • a plurality of holes may be provided at predetermined intervals in the axial direction on at least a part of the side surface of the second L-shaped member.
  • the size of the hole may be twice or more the size of the aggregate grain.
  • connection structure of steel pipe sheet piles according to any one of (1) to (3) above at least a part of the first L-shaped member in the vicinity of the distal end thereof has the second L A seal member that extends toward the mold member and that can contact the second L-shaped member may be provided.
  • the seal member may have a tapered portion whose width gradually increases downward from the upper end of the first L-shaped member. Good.
  • irregularities are formed on the contact surface of the concrete of the first L-shaped member and / or the second L-shaped member. May be.
  • a second aspect of the present invention is a structure in which a plurality of steel pipe sheet piles are installed in water in a substantially vertical direction, and the steel pipe sheet piles are joined together by a joint.
  • a concrete including an aggregate is placed in a space that is fitted into one L-shaped member and surrounded by the pair of first L-shaped members and the pair of second L-shaped members.
  • the gap between the tip of the L-shaped member and the second L-shaped member is smaller than the size of the aggregate grains, and the gap between the tip of the second L-shaped member and the first L-shaped member is , Larger than twice the size of the aggregate grain, and at least in the buried portion of the connection structure below the bottom of the water, the second L-shaped Holes are provided in the material side surface at predetermined intervals in the axial direction, and at least above the water bottom of the joint structure, the second L-shaped member side is in the vicinity of the outer tip of the first L-shaped member. It is a structure provided with a seal member that extends toward the surface and that can contact the second L-shaped member. (8) In the structure according to (7) above, irregularities may be formed on the concrete contact surface of the first L-shaped member and / or the second L-shaped member.
  • the configuration described in (1) above installation is easy because it is not a structure in which slits are engaged with each other as in PP joining.
  • the gap between the tip of the first L-shaped member and the second L-shaped member is smaller than the size of the aggregate grains, when the concrete is placed, the aggregate fills the gap, and from the gap Concrete does not flow out of the connection structure.
  • the gap between the tip of the second L-shaped member and the first L-shaped member is at least twice the size of the aggregate grains, the inside of the connection structure can be used even when using concrete containing aggregate. The concrete can be reliably filled. Therefore, the concrete can be placed easily and reliably.
  • the concrete since the concrete flows through the holes by providing a plurality of holes in a part of the second L-shaped member, the concrete is surely provided inside the connection structure between the L-shaped members. Can be filled. Moreover, the adhesion strength between the concrete and the L-shaped member is improved by the concrete entering the hole. According to the configuration described in (3) above, since the size of the hole is twice or more the size of the aggregate grain, concrete can be filled more reliably. According to the configuration described in (4) above, a seal member that can come into contact with the second L-shaped member toward the second L-shaped member side at a part near the tip of the first L-shaped member. Therefore, it is possible to more reliably prevent the concrete from leaking from the gap between the L-shaped members.
  • the second L of the adjacent steel pipe sheet piles is provided by providing the tapered portion in which the width of the seal member gradually increases from the upper end of the first L-shaped member downward.
  • the mold member can be easily inserted. For this reason, work is easy.
  • the configuration described in the above (6) since unevenness is formed on the contact surface of the concrete of the first L-shaped member and / or the second L-shaped member, the adhesion strength with the concrete increases, A stronger connection structure can be obtained.
  • connection structure is constituted by a pair of L-shaped members, the workability is excellent, and by providing a hole in the second L-shaped member located in the portion below the water bottom, the filling property of the concrete is improved, The adhesion strength between the concrete and the L-shaped member can be increased. Even if the holes are exposed to the outside, the concrete will not flow out further under the water bottom, and there will be no problem of water contamination.
  • a seal member is provided above the bottom of the water, it is possible to reliably suppress the outflow of concrete from the slight gap that remains even when the gap is filled with aggregate, and to prevent water contamination Can do.
  • FIG. 4 is a downward enlarged view of the structure 1 according to the embodiment of the present invention, and is a view showing a hole 21 provided in the bottom portion 9 of the water bottom.
  • 3 is a cross-sectional view including a hole 21 in a joint 13.
  • FIG. 1A and 1B show a structure 1 according to an embodiment of the present invention.
  • FIG. 1A is an elevation view of the structure 1
  • FIG. 1B is a plan view of the structure 1.
  • the structure 1 mainly includes a plurality of steel pipe sheet piles 3 provided on the bottom 5 and a bottom plate 7.
  • the steel pipe sheet pile 3 which comprises the structure 1 is arrange
  • the joining of the steel pipe sheet piles 3 is performed by a joint 13 provided on the side of the steel pipe sheet pile 3. Since the joint 13 is watertight, water within a range surrounded by the plurality of steel pipe sheet piles 3 can be discharged.
  • a bottom plate 7 is provided on the inner lower surface surrounded by the steel pipe sheet pile 3.
  • the bottom plate 7 is made of concrete, for example.
  • the shape of the structure 1 formed by the steel pipe sheet pile 3 is not limited to a circle, and may be another shape such as a rectangle. Further, in the following description, a portion provided at a position deeper than the bottom 5 of the steel pipe sheet pile 3 is referred to as a bottom bottom 9, and a portion above the bottom 5 is referred to as a bottom top 11.
  • FIG. 2A and 2B show the joint 13.
  • FIG. 2A is a view showing between the steel pipe sheet piles 3a and 3b
  • FIG. 2B is an enlarged view of a portion A in FIG. 2A.
  • L-shaped members 15a and 15b are provided on both sides of the steel pipe sheet piles 3a and 3b along the axial directions of the steel pipe sheet piles 3a and 3b.
  • a pair of L-shaped members 15a is provided on one side (right side in the figure) of the steel pipe sheet piles 3a and 3b.
  • a pair of L-shaped members 15b are provided on the other side (left side in the figure) of the steel pipe sheet piles 3a and 3b. That is, the L-shaped members 15a and 15b are provided on the substantially opposite sides of the steel pipe sheet piles 3a and 3b. As the L-shaped members 15a and 15b, section steel having an L-shaped cross section may be used.
  • the L-shaped member 15a is a plate-shaped member that is bent in an L-shape, and is provided toward the connecting direction of adjacent steel pipe sheet piles (right side in the figure).
  • the pair of L-shaped members 15a includes a base portion 17a provided substantially parallel to each other, and an arm portion 19a bent substantially vertically toward each other at the distal end portion of the base portion 17a.
  • the L-shaped member 15b is a plate-shaped member that is bent into an L-shape, and is provided toward the connecting direction of adjacent steel pipe sheet piles (left side in the figure).
  • the pair of L-shaped members 15b includes a base portion 17b provided substantially parallel to each other, and an arm portion 19b bent substantially perpendicularly toward each other at the distal end portion of the base portion 17b.
  • a hole 21 is provided in a part of the base portion 17b of the L-shaped member 15b.
  • the base portions 17a and 17b of the L-shaped members 15a and 15b are joined to predetermined positions of the steel pipe sheet piles 3a and 3b by welding or the like.
  • the pair of L-shaped members 15a and the pair of L-shaped members 15b of the steel pipe sheet piles 3a and 3b to be joined are provided to face each other.
  • the base portions 17b of the pair of L-shaped members 15b are disposed between the tips of the arm portions 19b of the pair of L-shaped members 15a, and the arm portions 19b of the L-shaped member 15b are in a space surrounded by the pair of L-shaped members 15a. It will fit.
  • the second steel pipe sheet pile for example, the steel pipe sheet pile 3b
  • the second steel pipe sheet pile is installed from above the existing steel pipe sheet pile. What is necessary is just to insert from upper direction so that L-shaped members may mesh.
  • the space surrounded by the L-shaped members 15a, 15b and the steel pipe sheet piles 3a, 3b is filled with concrete 23.
  • the filling of the concrete 23 ensures the water tightness of the joint 13 and ensures the strength of the joint.
  • FIG. 3 is a lower enlarged view of the structure 1 and shows the steel pipe sheet pile 3 provided in the bottom 9 of the water bottom.
  • the steel pipe sheet pile 3 is provided on the bottom 5. Therefore, the lower part (bottom bottom 9) of the steel pipe sheet pile 3 is buried in the bottom 5.
  • a plurality of holes 21 are provided at predetermined intervals in the base portion 17b of the L-shaped member 15b. That is, the hole 21 is provided at least in the base portion 17b of the L-shaped member 15b located in the bottom 9 of the water bottom.
  • FIG. 4A and 4B are cross-sectional views including the hole 21 in the joint 13.
  • FIG. 4A is a diagram showing a state in which the steel pipe sheet piles 3a and 3b are provided at straight positions (that is, a state in which the L-shaped members 15a and 15b are provided without being in contact with each other).
  • FIG. 4B shows a state in which the steel pipe sheet piles 3a and 3b are displaced from each other in a direction substantially perpendicular to the connection direction (that is, a state in which the end portion of the L-shaped member 15a is provided in contact with the L-shaped member 15b).
  • FIG. 4A is a diagram showing a state in which the steel pipe sheet piles 3a and 3b are provided at straight positions (that is, a state in which the L-shaped members 15a and 15b are provided without being in contact with each other).
  • FIG. 4B shows a state in which the steel pipe sheet piles 3a and 3b are displaced from each other in a direction substantially perpen
  • the inside of the joint 13 is filled with the concrete 23 including the aggregate 25.
  • the aggregate 25 can use various crushed stones.
  • a natural aggregate such as sea sand or an artificial aggregate such as blast furnace slag may be used as the aggregate 25.
  • the aggregate 25 is, for example, a coarse aggregate (an aggregate that uses a 5 mm sieve and remains at 85% or more by weight), and the size of the grains is preferably about 20 mm, for example.
  • the grain size of the aggregate 25 represents the approximate maximum dimension of the coarse aggregate.
  • the particle size of the aggregate 25 is 20 mm.
  • the weight percentage of particles passing through the sieve is 90 to 100% by the sieve having a nominal size of 20 mm. It shows that there is. That is, the size of the coarse aggregate grains includes grains of about 5 to 20 mm.
  • the size of the aggregate 25 in the present invention is the above-mentioned JIS of the aggregate mainly included in the concrete. Refers to the grain size defined by. For example, when the coarse aggregate A having a coarse grain ratio or an actual performance ratio of 50% or more is included, even if other fine aggregates or fine grains are contained, the grain of the coarse aggregate A is JIS Refers to the indicated size.
  • 4A and 4B only a part of the aggregate 25 is shown.
  • 4A and 4B show a state before the concrete 23 is consolidated, and the aggregate 25 can be freely moved inside the joint 13.
  • C needs to be larger than B 'in the state of FIG. 4B where the positions of the steel pipe sheet piles are most displaced.
  • the movement route of the aggregate 25 is sufficiently large with respect to the size of the aggregate 25. There is a need. This is because if the moving route is smaller than the aggregate 25, the route is blocked by the aggregate 25 and the filling of the concrete 23 is prevented.
  • the movement route of the aggregate 25 includes, for example, a gap (in the direction of arrow G in the figure) from the tip of the arm portion 19b of the L-shaped member 15b to the inner surface of the base portion 17a of the L-shaped member 15a.
  • a gap in the direction of arrow G in the figure
  • D ′ is sufficiently larger than d.
  • D ′ is twice or more than d, it is desirable that the aggregate 25 is not clogged at this position and does not hinder the flow of the concrete 23.
  • the gap between the tip of the arm portion 19a of the L-shaped member 15a and the outer surface of the base portion 17b of the L-shaped member 15b is B 'at the maximum.
  • the gap is larger than the size d of the aggregate 25, the aggregate 25 (concrete 23) flows out from the gap.
  • the concrete 23 flows out into the water. Therefore, water is polluted. For this reason, it is necessary to prevent the leakage of the concrete 23 from this gap.
  • B ′ is preferably smaller than d. In other words, it is desirable that B is smaller than approximately 1 ⁇ 2 of d.
  • FIG. 5A is a diagram showing a state in which the steel pipe sheet pile 3b is provided at a position closest to the steel pipe sheet pile 3a side
  • FIG. 5B is a drawing in which the steel pipe sheet pile 3b is provided at a position farthest away from the steel pipe sheet pile 3a. It is a figure which shows a state.
  • the aggregate 25 is clogged in the gap between the tip of the L-shaped member 15a (arm portion 19a) and the outer surface of the base portion 17b of the L-shaped member 15b. For this reason, the outflow of the concrete 23 from this clearance gap is suppressed.
  • the base portion 17b is exposed to the outside of the arm portion 19a.
  • the hole 21 allows the outside and the inside of the joint 13 to communicate with each other. Therefore, the concrete 23 including the aggregate 23 may flow out through the hole 21 (in the direction of arrow M in the figure).
  • FIG. 6A, FIG. 6B, and FIG. 6C are views showing a state in which a seal member is provided on the arm portion 19a.
  • a seal member 27a is provided on the outer surface of the arm portion 19a so as to extend toward the distal end of the arm portion 19a.
  • the seal member 27a is a material that can be elastically plastically deformed.
  • a metal such as a thin steel plate or a resin such as rubber can be used.
  • the seal member is provided in a range from the upper side of the steel pipe sheet pile 3 to at least the upper bottom 11 (FIG. 1A). This is because, in the lower water bottom portion 9 (FIG. 1A), the surrounding earth and sand plays a role of a sealing member as described above.
  • the sealing member 27a may be curved in advance.
  • the seal member 27b may be provided straight with respect to the arm portion 19a. In any case, the seal member can be deformed in contact with the base portion 17b on the steel pipe sheet pile 3b side to be joined, thereby closing the gap between the arm portion 19a and the base portion 17b. In the following description, an example using the seal member 27a will be described.
  • FIG. 6C is a diagram showing a state in which the steel pipe sheet piles 3a and 3b are connected.
  • the arm portion 19a of the pair of L-shaped members 15a is provided with a seal member 27a protruding from the arm portion 19a in the inner direction.
  • the tip of the seal member 27a contacts the outer surface of the base portion 17b of the steel pipe sheet pile 3b to be joined. Since the seal member 27a can be elasto-plastically deformed, the seal member 27a also follows the displacement of the steel pipe sheet piles 3a and 3b (displacement as shown in FIG. 4B), and the gap between the arm portion 19a and the base portion 17b is closed. Therefore, even if the gap between the arm portion 19a and the base portion 17b is closed by the aggregate 25, the concrete 23 that flows out slightly (in the direction of arrow O in the figure) can be more reliably prevented.
  • FIG. 7A shows the L-shaped member 15a in a state where the seal member 27a is provided.
  • 7A is a front view seen from the joining direction side of the L-shaped member 15a
  • FIG. 7B is a cross-sectional view taken along line PP in FIG. 7A
  • FIG. 7C is a cross-sectional view taken along line QQ in FIG.
  • the seal member 27 a is provided along the L-shaped member 15 a in the axial direction of the steel pipe sheet pile 3.
  • a tapered portion 29 is provided above the seal member 27a.
  • the tapered portion 29 is formed so that the distance between the tips of the pair of seal members 27a increases upward. That is, a tapered portion 29 is formed above the seal member 27a so that the width (horizontal direction length) of the seal member 27a gradually decreases upward.
  • the horizontal length of the seal member 27a is short near the upper end of the steel pipe sheet pile 3b.
  • the seal member 27a provided on the outer surface of the arm portion 19a does not protrude from the tip end of the arm portion 19a in the vicinity of the upper end, and the interval between the pair of arm portions 19a is ensured. That is, in FIG. 7B, the L-shaped member 15b to be joined is illustrated by a dotted line, but the base portion 17b of the L-shaped member 15b does not contact the seal member 27a but contacts the arm portion 19a.
  • the seal member 27a does not contact the L-shaped member 15b. For this reason, the insertability of the L-shaped member 15b is not affected, and the workability is excellent.
  • the seal member 27a is below the taper portion 29 of the seal member 27a (the portion located below the water surface) by a length sufficient for the seal member 27a to close the gap from the tip of the arm portion 19a. It protrudes and contacts the base 17b. For this reason, the gap between the arm portion 19a and the base portion 17b is closed by the seal member 27a. Therefore, concrete does not flow out of this gap.
  • the hole 21 is provided only in the lower water bottom 9 and the seal member 27a is provided only in the upper water bottom 11.
  • the sealing member 27a may be provided up to the bottom bottom 9, and the hole 21 may be formed in the bottom top 11. Even if the hole 21 is formed in the upper water bottom 11, leakage of the concrete can be prevented by making the size of the hole 21 smaller than the size of the aggregate 25 or combining it with the seal member 27a.
  • the steel pipe sheet piles can be easily joined to each other, the concrete filling property is excellent, and the concrete can be reliably prevented from flowing out into water. Moreover, since the cross-sectional area enclosed by the L-shaped members 15a and 15b is large, a high shear strength can be obtained at the joint.
  • the steel pipe sheet piles 3a and 3b are joined by the joint 13 using the L-shaped members 15a and 15b, for example, a pair of L-shaped members 15b may be inserted between the pair of L-shaped members 15a.
  • the concrete 23 as the filler includes an aggregate 25, and the gap between the tip of the arm portion 19 a of the L-shaped member 15 a and the outer surface of the base portion 17 b of the L-shaped member 15 b is smaller than the size of the aggregate 25. For this reason, the aggregate 25 is clogged in this gap, and further outflow of the concrete 23 can be suppressed.
  • the gap between the distal end of the arm portion 19b of the L-shaped member 15b and the inner surface of the base portion 17a of the L-shaped member 15a is sufficiently large with respect to the size of the aggregate 25. For this reason, the concrete 23 is reliably filled in the space between the L-shaped members 15a and 15b.
  • the concrete 23 enters the hole 21, and the adhesion strength between the concrete 23 and the L-shaped member 15b can be increased. For this reason, a high shear strength can be obtained at the joint. Further, since the size of the hole 21 is sufficiently larger than the size of the aggregate 25, the concrete 23 passes through the hole 21 when the concrete 23 is placed in the space between the L-shaped members 15a and 15b. . For this reason, the concrete 23 can be more reliably filled into the space.
  • the sealing member 27a when the sealing member 27a is provided in the water bottom upper part 11, the outflow of the concrete 23 from the clearance gap between the arm part 19a front-end
  • the seal member 27a has the taper portion 29 at the top, the seal member 27a does not hinder the insertion when the L-type member 15b is inserted into the L-type member 15a. For this reason, the L-shaped member 15 b can be inserted along the tapered portion 29.
  • the adhesion strength between the concrete 23 and the L-shaped members 15a and 15b is improved. Accordingly, the shear strength of the joint is improved.
  • connection structure for joining the steel pipe sheet piles is the first steel pipe sheet pile, the second steel pipe sheet pile adjacent to the first steel pipe sheet pile, the first arm portion, and the first base portion.
  • a concrete portion including an aggregate placed in a space surrounded by an L-shaped member and the pair of second L-shaped members, and the gap between the first arm portion and the second base portion is The clearance between the second arm portion and the first base portion is smaller than the size of the aggregate particles, and the aggregate
  • a plurality of holes may be provided at predetermined intervals in the axial direction on at least a part of the side surface of the second L-shaped member.
  • the size of the hole may be twice or more the size of the aggregate grain.
  • a seal member that extends toward the second L-shaped member and contacts the second L-shaped member may be provided on at least a part of the first arm portion. Further, the seal member may have a tapered portion whose width gradually increases downward from the upper end of the first L-shaped member.
  • the first L-shaped member and the second L-shaped member have a contact surface that contacts the concrete portion, and at least one of the first L-shaped member and the second L-shaped member. Irregularities may be formed on the contact surface.

Abstract

Disclosed is a structure for connecting steel pipe sheet piles which is provided with: a pair of first L-shaped members which are joined, both facing inwards, to the side of a first steel pipe sheet pile; and a pair of second L-shaped members which are provided opposite the first L-shaped members and joined, both facing outwards, to the side of a second steel pipe sheet pile adjacent to the first steel pipe sheet pile. The pair of second L-shaped members is positioned inside of the pair of first L-shaped members, and concrete containing aggregate is placed in the space enclosed by the pair of first L-shaped members and the pair of second L-shaped members. The gap between the tip ends of the first L-shaped members and the second L-shaped members is smaller than the aggregate grain size, and the gap between the tip ends of the second L-shaped members and the first L-shaped members is at least twice the aggregate grain size.

Description

鋼管矢板同士の接続構造および構造体Connection structure and structure of steel pipe sheet piles
　本発明は、鋼管矢板同士を互いに連結するための、鋼管矢板の接続構造およびこれを用いた構造体に関する。
　本願は、２００９年６月１９日に、日本に出願された特願２００９－１４６２７１号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a steel pipe sheet pile connection structure for connecting steel pipe sheet piles to each other, and a structure using the connection structure.
This application claims priority based on Japanese Patent Application No. 2009-146271 filed in Japan on June 19, 2009, the contents of which are incorporated herein by reference.
　従来、鋼管矢板を複数連結することで鋼管矢板基礎などが構築されている。鋼管矢板の連結は、隣り合う鋼管矢板の外面に設けられたスリット入りパイプを互いに嵌め合わせて接合する、いわゆるＰ－Ｐ型接合により一般的に行われる。 Conventionally, a steel pipe sheet pile foundation is constructed by connecting a plurality of steel pipe sheet piles. The steel pipe sheet piles are generally connected by so-called PP type joining in which pipes with slits provided on the outer surfaces of adjacent steel pipe sheet piles are fitted together and joined.
　通常、Ｐ－Ｐ型接合においては、嵌め合わされたパイプの空間内を洗浄し、内部にモルタルを充填する。これにより、互いの連結を確実にし、せん断耐力を確保する。しかし、従来のＰ－Ｐ型接合では、狭隘な空間内を洗浄しモルタルを充填する必要があることから、この品質が不安定になる恐れがあった。また、より高いせん断耐力を得るためには、内面突起付き鋼管を用いるなどの必要があった。 Usually, in the PP joint, the inside of the fitted pipe is washed and filled with mortar. This ensures mutual connection and secures shear strength. However, in the conventional PP type bonding, since it is necessary to clean the narrow space and fill it with mortar, this quality may become unstable. Moreover, in order to obtain a higher shear strength, it was necessary to use a steel pipe with an inner protrusion.
　特許文献１に開示された鋼管矢板の継手構造では、第１の鋼管矢板に、一対のＬ型鋼材が互いに内向きとなるように設けられ、かつ、第２の鋼管矢板に、一対のＬ型鋼材が互いに外向きとなるように設けられる。そして、内向きの一対のＬ型鋼材に、外向きの一対のＬ型鋼材が嵌められることで、第１の鋼管矢板と第２の鋼管矢板とが連結される。さらに、それぞれのＬ型鋼材の間には、棒状鋼材が設けられる。 In the joint structure of the steel pipe sheet pile disclosed in Patent Document 1, the pair of L-shaped steel materials are provided on the first steel pipe sheet pile so as to face each other inward, and the pair of L-shaped steel sheets are provided on the second steel pipe sheet pile. The steel materials are provided so as to face each other. And a 1st steel pipe sheet pile and a 2nd steel pipe sheet pile are connected by a pair of outward L type steel materials being fitted by a pair of inward L type steel materials. Furthermore, rod-shaped steel materials are provided between the respective L-shaped steel materials.
日本国特開２００５－２８２１７４号公報Japanese Unexamined Patent Publication No. 2005-282174
　しかし、特許文献１に記載の鋼管矢板の継手構造では、内外それぞれに向けられたＬ型鋼材同士の間隔が小さいため、この間の洗浄やモルタルの充填が困難である。また、棒状部材を別途設ける必要があることから、鋼管矢板の製造工数が増加するという問題がある。 However, in the joint structure of steel pipe sheet piles described in Patent Document 1, the interval between the L-shaped steel materials directed to the inside and the outside is small, so that it is difficult to clean and fill the mortar. Moreover, since it is necessary to provide a rod-shaped member separately, there exists a problem that the manufacturing man-hour of a steel pipe sheet pile increases.
　本発明は、このような問題に鑑みてなされ、高いせん断耐力を有し、構造が簡易で連結作業性に優れ、水の汚濁を防止可能な鋼管矢板継手を提供することを目的とする。 This invention is made in view of such a problem, and it aims at providing the steel pipe sheet pile joint which has high shear strength, is simple in structure, is excellent in connection workability | operativity, and can prevent water pollution.
　本発明は、前述した目的を達成するため、以下の手段を採用した。
（１）本発明の第一の態様は、鋼管矢板同士の接続構造であって、第１鋼管矢板の側方に互いに内方に向けて接合された一対の第１のＬ型部材と、前記第１鋼管矢板と隣り合う第２鋼管矢板の側方に、前記第１のＬ型部材と対向するように設けられ、互いに外方に向けて接合された一対の第２のＬ型部材と、を具備する。
一対の前記第２のＬ型部材は、一対の前記第１のＬ型部材の内部に配設され、一対の前記第１のＬ型部材および一対の前記第２のＬ型部材とで囲まれた空間には骨材を含むコンクリートが打設され、前記第１のＬ型部材の先端と前記第２のＬ型部材との隙間は、前記骨材の粒の大きさよりも小さく、前記第２のＬ型部材の先端と前記第１のＬ型部材との隙間は、前記骨材の粒の大きさの２倍以上である。
（２）上記（１）に記載の鋼管矢板同士の接続構造では、前記第２のＬ型部材の少なくとも一部の側面には、軸方向に所定間隔で複数の孔が設けられてもよい。
（３）上記（２）に記載の鋼管矢板同士の接続構造では、前記孔の大きさは、前記骨材の粒の大きさの２倍以上であってもよい。
（４）上記（１）～（３）のいずれか１項に記載の鋼管矢板同士の接続構造では、前記第１のＬ型部材の先端部近傍の少なくとも一部には、前記第２のＬ型部材側に向けて延在する、前記第２のＬ型部材と接触可能なシール部材が設けられてもよい。
（５）上記（４）に記載の鋼管矢板同士の接続構造では、前記シール部材は、前記第１のＬ型部材の上端から下方に向けて徐々に幅が大きくなるテーパ部を有してもよい。
（６）上記（１）～（５）に記載の鋼管矢板同士の接続構造では、前記第１のＬ型部材および／または前記第２のＬ型部材の前記コンクリートの接触面には凹凸が形成されてもよい。
（７）本発明の第二の態様は、複数の鋼管矢板が略鉛直方向に水中に設置され、鋼管矢板同士が継手で接合された構造体である。第１鋼管矢板の側方に互いに内方に向けて接合された一対の第１のＬ型部材と、前記第１鋼管矢板と隣り合う第２鋼管矢板の側方に、前記第１のＬ型部材と対向するように設けられ、互いに外方に向けて接合された一対の第２のＬ型部材とを具備する接続構造を用い、一対の前記第２のＬ型部材は、一対の前記第１のＬ型部材に嵌りこみ、一対の前記第１のＬ型部材および一対の前記第２のＬ型部材とで囲まれた空間には骨材を含むコンクリートが打設され、前記第１のＬ型部材の先端と前記第２のＬ型部材との隙間は、前記骨材の粒の大きさよりも小さく、前記第２のＬ型部材の先端と前記第１のＬ型部材との隙間は、前記骨材の粒の大きさの２倍よりも大きく、前記接続構造の、少なくとも水底下への埋設部においては、前記第２のＬ型部材側面に軸方向に所定間隔で孔が設けられ、前記継手構造の、少なくとも水底よりも上方部においては、前記第１のＬ型部材の外方先端部近傍に前記第２のＬ型部材側に向けて延在する、前記第２のＬ型部材と接触可能なシール部材が設けられる構造体である。
（８）上記（７）に記載の構造体では、前記第１のＬ型部材および／または前記第２のＬ型部材の前記コンクリートの接触面には凹凸が形成されてもよい。 The present invention employs the following means in order to achieve the object described above.
(1) A first aspect of the present invention is a connection structure between steel pipe sheet piles, and a pair of first L-shaped members joined inward to each other on the side of the first steel pipe sheet pile, A pair of second L-shaped members that are provided on the side of the second steel pipe sheet pile adjacent to the first steel pipe sheet pile so as to face the first L-shaped member, and are joined outward. It comprises.
The pair of second L-shaped members are disposed inside the pair of first L-shaped members, and are surrounded by the pair of first L-shaped members and the pair of second L-shaped members. Concrete containing aggregate is placed in the space, and the gap between the tip of the first L-shaped member and the second L-shaped member is smaller than the size of the grains of the aggregate, and the second The gap between the tip of the L-shaped member and the first L-shaped member is at least twice the size of the aggregate grains.
(2) In the connection structure between steel pipe sheet piles described in (1) above, a plurality of holes may be provided at predetermined intervals in the axial direction on at least a part of the side surface of the second L-shaped member.
(3) In the connection structure between steel pipe sheet piles described in (2) above, the size of the hole may be twice or more the size of the aggregate grain.
(4) In the connection structure of steel pipe sheet piles according to any one of (1) to (3) above, at least a part of the first L-shaped member in the vicinity of the distal end thereof has the second L A seal member that extends toward the mold member and that can contact the second L-shaped member may be provided.
(5) In the connection structure between steel pipe sheet piles according to (4) above, the seal member may have a tapered portion whose width gradually increases downward from the upper end of the first L-shaped member. Good.
(6) In the connection structure between steel pipe sheet piles as described in (1) to (5) above, irregularities are formed on the contact surface of the concrete of the first L-shaped member and / or the second L-shaped member. May be.
(7) A second aspect of the present invention is a structure in which a plurality of steel pipe sheet piles are installed in water in a substantially vertical direction, and the steel pipe sheet piles are joined together by a joint. A pair of first L-shaped members joined inward to each other on the side of the first steel pipe sheet pile, and on the side of the second steel pipe sheet pile adjacent to the first steel pipe sheet pile, the first L type A pair of second L-shaped members provided to face the members and joined to each other outward, and the pair of second L-shaped members is a pair of the first L-shaped members. A concrete including an aggregate is placed in a space that is fitted into one L-shaped member and surrounded by the pair of first L-shaped members and the pair of second L-shaped members. The gap between the tip of the L-shaped member and the second L-shaped member is smaller than the size of the aggregate grains, and the gap between the tip of the second L-shaped member and the first L-shaped member is , Larger than twice the size of the aggregate grain, and at least in the buried portion of the connection structure below the bottom of the water, the second L-shaped Holes are provided in the material side surface at predetermined intervals in the axial direction, and at least above the water bottom of the joint structure, the second L-shaped member side is in the vicinity of the outer tip of the first L-shaped member. It is a structure provided with a seal member that extends toward the surface and that can contact the second L-shaped member.
(8) In the structure according to (7) above, irregularities may be formed on the concrete contact surface of the first L-shaped member and / or the second L-shaped member.
　上記（１）に記載の構成によれば、Ｐ－Ｐ接合のようにスリット同士をかみ合わせる構造ではないため、設置が容易である。また、第１のＬ型部材の先端と第２のＬ型部材との隙間が、骨材の粒の大きさよりも小さいため、コンクリートを打設した際に、骨材が隙間を埋め、隙間からコンクリートが接続構造の外部に流出することがない。また、第２のＬ型部材の先端と第１のＬ型部材との隙間が、骨材の粒の大きさの２倍以上であるため、骨材を含むコンクリートを用いても、接続構造内部に確実にコンクリートを充填することができる。したがって、コンクリートの打設を容易かつ確実に行うことができる。
　上記（２）に記載の構成によれば、第２のＬ型部材の一部に複数の孔を設けることにより、孔を通じてコンクリートが流れるため、Ｌ型部材同士の接続構造内部に、確実にコンクリートを充填することができる。また、孔にコンクリートが入りこむことでコンクリートとＬ型部材との付着強度が向上する。
　上記（３）に記載の構成によれば、孔の大きさが骨材の粒の大きさの２倍以上であるため、より確実にコンクリートを充填することができる。
　上記（４）に記載の構成によれば、第１のＬ型部材の先端部近傍の一部に、第２のＬ型部材側に向けて、第２のＬ型部材と接触可能なシール部材が設けられるため、Ｌ型部材同士の隙間からコンクリートが漏れだすことをより確実に防止することができる。
　上記（５）に記載の構成によれば、第１のＬ型部材の上端から下方に向けて徐々にシール部材の幅が大きくなるテーパ部を設けることで、隣接する鋼管矢板の第２のＬ型部材を容易に挿入することができる。このため作業が容易である。
　上記（６）に記載の構成によれば、第１のＬ型部材および／または第２のＬ型部材のコンクリートの接触面に凹凸が形成されるため、コンクリートとの付着強度が増加して、より強固な接続構造を得ることができる。
　上記（７）に記載の構成によれば、簡易な構造で施工性に優れ、強度の高い構造体を得ることができる。特に、一対のＬ型部材で接続構造が構成されるため、施工性に優れ、水底より下の部分に位置する第２のＬ型部材に孔を設けることで、コンクリートの充填性を高めるとともに、コンクリートとＬ型部材との付着強度を高めることができる。孔が外方に露出する場合であっても、水底下であれば、それ以上コンクリートが流出することがなく、水の汚濁の問題もない。
　また、水底より上の部分にはシール部材が設けられるため、骨材によって隙間が埋められてもなお残るわずかな隙間からのコンクリートの流出を確実に抑えることができ、水の汚濁を防止することができる。
　上記（８）に記載の構成によれば、第１のＬ型部材および／または第２のＬ型部材のコンクリート接触面に凹凸が形成されるため、コンクリートに対する付着強度が増加して、より強固な接続構造を有する構造体を得ることができる。 According to the configuration described in (1) above, installation is easy because it is not a structure in which slits are engaged with each other as in PP joining. In addition, since the gap between the tip of the first L-shaped member and the second L-shaped member is smaller than the size of the aggregate grains, when the concrete is placed, the aggregate fills the gap, and from the gap Concrete does not flow out of the connection structure. Further, since the gap between the tip of the second L-shaped member and the first L-shaped member is at least twice the size of the aggregate grains, the inside of the connection structure can be used even when using concrete containing aggregate. The concrete can be reliably filled. Therefore, the concrete can be placed easily and reliably.
According to the configuration described in (2) above, since the concrete flows through the holes by providing a plurality of holes in a part of the second L-shaped member, the concrete is surely provided inside the connection structure between the L-shaped members. Can be filled. Moreover, the adhesion strength between the concrete and the L-shaped member is improved by the concrete entering the hole.
According to the configuration described in (3) above, since the size of the hole is twice or more the size of the aggregate grain, concrete can be filled more reliably.
According to the configuration described in (4) above, a seal member that can come into contact with the second L-shaped member toward the second L-shaped member side at a part near the tip of the first L-shaped member. Therefore, it is possible to more reliably prevent the concrete from leaking from the gap between the L-shaped members.
According to the configuration described in (5) above, the second L of the adjacent steel pipe sheet piles is provided by providing the tapered portion in which the width of the seal member gradually increases from the upper end of the first L-shaped member downward. The mold member can be easily inserted. For this reason, work is easy.
According to the configuration described in the above (6), since unevenness is formed on the contact surface of the concrete of the first L-shaped member and / or the second L-shaped member, the adhesion strength with the concrete increases, A stronger connection structure can be obtained.
According to the configuration described in (7) above, it is possible to obtain a structure having a simple structure, excellent workability, and high strength. In particular, since the connection structure is constituted by a pair of L-shaped members, the workability is excellent, and by providing a hole in the second L-shaped member located in the portion below the water bottom, the filling property of the concrete is improved, The adhesion strength between the concrete and the L-shaped member can be increased. Even if the holes are exposed to the outside, the concrete will not flow out further under the water bottom, and there will be no problem of water contamination.
In addition, since a seal member is provided above the bottom of the water, it is possible to reliably suppress the outflow of concrete from the slight gap that remains even when the gap is filled with aggregate, and to prevent water contamination Can do.
According to the configuration described in (8) above, since the unevenness is formed on the concrete contact surface of the first L-shaped member and / or the second L-shaped member, the adhesion strength to the concrete is increased and the strength is further increased. A structure having a simple connection structure can be obtained.
　本発明によれば、高いせん断耐力を有し、構造が簡易で連結作業性に優れ、水の汚濁を防止可能な鋼管矢板継手を提供することができる。 According to the present invention, it is possible to provide a steel pipe sheet pile joint having a high shear strength, a simple structure, excellent connection workability, and capable of preventing water contamination.
本発明の一実施形態にかかる構造体１の立面図である。It is an elevation view of structure 1 concerning one embodiment of the present invention. 本発明の一実施形態にかかる構造体１の平面図である。It is a top view of structure 1 concerning one embodiment of the present invention. ２本の鋼管矢板３ａ、３ｂを連結する継手１３近傍を示す図である。It is a figure which shows the coupling 13 vicinity which connects two steel pipe sheet piles 3a and 3b. 図２ＡのＡ部拡大図である。It is the A section enlarged view of FIG. 2A. 本発明の一実施形態に係る構造体１の下方拡大図であり、水底下部９に設けられた孔２１を示す図である。FIG. 4 is a downward enlarged view of the structure 1 according to the embodiment of the present invention, and is a view showing a hole 21 provided in the bottom portion 9 of the water bottom. 継手１３における孔２１を含む断面図である。3 is a cross-sectional view including a hole 21 in a joint 13. FIG. 継手１３における孔２１を含む断面図であり、２本の鋼管矢板３ａ、３ｂが互いに接続方向と略垂直な方向にずれて設置された状態を示す図である。It is sectional drawing containing the hole 21 in the coupling 13, and is a figure which shows the state in which the two steel pipe sheet piles 3a and 3b were mutually shifted | deviated and installed in the direction substantially perpendicular | vertical to a connection direction. 継手１３における孔２１を含む断面図であり、鋼管矢板３ｂが鋼管矢板３ａ側に最も近づいた位置に設けられた状態を示す図である。It is sectional drawing containing the hole 21 in the coupling 13, and is a figure which shows the state in which the steel pipe sheet pile 3b was provided in the position closest to the steel pipe sheet pile 3a side. 継手１３における孔２１位置の断面図であり、鋼管矢板３ｂが鋼管矢板３ａとは逆方向に最も遠のいた位置に設けられた状態を示す図である。It is sectional drawing of the hole 21 position in the coupling 13, and is a figure which shows the state in which the steel pipe sheet pile 3b was provided in the position farthest in the reverse direction to the steel pipe sheet pile 3a. Ｌ型部材１５ａにシール部材２７aが設けられた状態を示す図である。It is a figure which shows the state by which the sealing member 27a was provided in the L-shaped member 15a. Ｌ型部材１５ａにシール部材２７ｂが設けられた状態を示す図である。It is a figure which shows the state by which the sealing member 27b was provided in the L-shaped member 15a. シール部材２７ａが設けられたＬ型部材により２本の鋼管矢板３ａ、３ｂが接続された状態を示す図である。It is a figure which shows the state by which the two steel pipe sheet piles 3a and 3b were connected by the L-shaped member in which the sealing member 27a was provided. シール部材２７ａの上部のテーパ部２９を示す正面図である。It is a front view which shows the taper part 29 of the upper part of the sealing member 27a. 図７ＡのＰ－Ｐ線断面図である。It is the PP sectional view taken on the line of FIG. 7A. 図７ＡのＱ－Ｑ線断面図である。It is the QQ sectional view taken on the line of FIG. 7A.
　以下、本発明の実施の形態にかかる構造体について説明する。図１Ａ、図１Ｂは、本発明の一実施形態にかかる構造体１を示す。図１Ａは構造体１の立面図であり、図１Ｂは構造体１の平面図である。 Hereinafter, the structure according to the embodiment of the present invention will be described. 1A and 1B show a structure 1 according to an embodiment of the present invention. FIG. 1A is an elevation view of the structure 1, and FIG. 1B is a plan view of the structure 1.
　構造体１は、主に水底５に設けられた複数の鋼管矢板３と、底版７等を含有する。構造体１を構成する鋼管矢板３は、例えば図１Ｂに示すように円形に複数配置される。鋼管矢板３同士の接合は、鋼管矢板３の側方に設けられた継手１３によって行われる。継手１３は水密性があるため、複数の鋼管矢板３で囲まれた範囲内の水は排出可能である。 The structure 1 mainly includes a plurality of steel pipe sheet piles 3 provided on the bottom 5 and a bottom plate 7. The steel pipe sheet pile 3 which comprises the structure 1 is arrange | positioned in multiple numbers, for example, as shown to FIG. 1B. The joining of the steel pipe sheet piles 3 is performed by a joint 13 provided on the side of the steel pipe sheet pile 3. Since the joint 13 is watertight, water within a range surrounded by the plurality of steel pipe sheet piles 3 can be discharged.
　鋼管矢板３により囲まれた内部の下面には底版７が設けられる。底版７は例えばコンクリート製である。 A bottom plate 7 is provided on the inner lower surface surrounded by the steel pipe sheet pile 3. The bottom plate 7 is made of concrete, for example.
　なお、鋼管矢板３により形成される構造体１の形状は円形に限られず、矩形等他の形状であってもよい。また、以後の説明において、鋼管矢板３の水底５よりも深い位置に設けられた部位を水底下部９と称し、水底５よりも上方を水底上部１１と称する。 In addition, the shape of the structure 1 formed by the steel pipe sheet pile 3 is not limited to a circle, and may be another shape such as a rectangle. Further, in the following description, a portion provided at a position deeper than the bottom 5 of the steel pipe sheet pile 3 is referred to as a bottom bottom 9, and a portion above the bottom 5 is referred to as a bottom top 11.
　次に、継手１３の構造について詳細に説明する。図２Ａ、図２Ｂは、継手１３を示す。図２Ａは鋼管矢板３ａ、３ｂ間を示す図であり、図２Ｂは図２ＡのＡ部拡大図である。なお、以下の説明においては、隣り合う鋼管矢板３ａ、３ｂ間の継手１３について説明する。鋼管矢板３ａ、３ｂの両側方には、鋼管矢板３ａ、３ｂそれぞれの軸方向に沿って、Ｌ型部材１５ａ、１５ｂが設けられる。Ｌ型部材１５ａは、鋼管矢板３ａ、３ｂの一方の側（図中右側）に一対設けられる。Ｌ型部材１５ｂは、鋼管矢板３ａ、３ｂの他方の側（図中左側）に一対設けられる。すなわち、Ｌ型部材１５ａ、１５ｂは、鋼管矢板３ａ、３ｂの互いに略反対側に設けられる。Ｌ型部材１５ａ、１５ｂとして、断面Ｌ字状の形鋼を用いてもよい。 Next, the structure of the joint 13 will be described in detail. 2A and 2B show the joint 13. FIG. 2A is a view showing between the steel pipe sheet piles 3a and 3b, and FIG. 2B is an enlarged view of a portion A in FIG. 2A. In the following description, the joint 13 between the adjacent steel pipe sheet piles 3a and 3b will be described. L-shaped members 15a and 15b are provided on both sides of the steel pipe sheet piles 3a and 3b along the axial directions of the steel pipe sheet piles 3a and 3b. A pair of L-shaped members 15a is provided on one side (right side in the figure) of the steel pipe sheet piles 3a and 3b. A pair of L-shaped members 15b are provided on the other side (left side in the figure) of the steel pipe sheet piles 3a and 3b. That is, the L-shaped members 15a and 15b are provided on the substantially opposite sides of the steel pipe sheet piles 3a and 3b. As the L-shaped members 15a and 15b, section steel having an L-shaped cross section may be used.
　Ｌ型部材１５ａは、それぞれＬ型状に屈曲された板状部材であり、隣り合う鋼管矢板の接続方向に向けて（図中右側）設けられる。一対のＬ型部材１５ａは、互いに略平行に設けられる基部１７ａと、基部１７ａの先端部で互いに内側に向けて略垂直に屈曲されるアーム部１９ａとを有する。 The L-shaped member 15a is a plate-shaped member that is bent in an L-shape, and is provided toward the connecting direction of adjacent steel pipe sheet piles (right side in the figure). The pair of L-shaped members 15a includes a base portion 17a provided substantially parallel to each other, and an arm portion 19a bent substantially vertically toward each other at the distal end portion of the base portion 17a.
　同様に、Ｌ型部材１５ｂは、それぞれＬ型状に屈曲された板状部材であり、隣り合う鋼管矢板の接続方向に向けて（図中左側）設けられる。一対のＬ型部材１５ｂは、互いに略平行に設けられる基部１７ｂと、基部１７ｂの先端部で互いに外側に向けて略垂直に屈曲されるアーム部１９ｂとを有する。Ｌ型部材１５ｂの基部１７ｂの一部には、孔２１が設けられる。なお、Ｌ型部材１５ａ、１５ｂそれぞれの基部１７ａ、１７ｂは、鋼管矢板３ａ、３ｂの所定位置に溶接等により接合される。 Similarly, the L-shaped member 15b is a plate-shaped member that is bent into an L-shape, and is provided toward the connecting direction of adjacent steel pipe sheet piles (left side in the figure). The pair of L-shaped members 15b includes a base portion 17b provided substantially parallel to each other, and an arm portion 19b bent substantially perpendicularly toward each other at the distal end portion of the base portion 17b. A hole 21 is provided in a part of the base portion 17b of the L-shaped member 15b. The base portions 17a and 17b of the L-shaped members 15a and 15b are joined to predetermined positions of the steel pipe sheet piles 3a and 3b by welding or the like.
　接合される鋼管矢板３ａ、３ｂそれぞれの一対のＬ型部材１５ａと一対のＬ型部材１５ｂとは互いに対向して設けられる。一対のＬ型部材１５ｂの基部１７ｂは、一対のＬ型部材１５ａのアーム部１９ｂ先端の間に配置され、Ｌ型部材１５ｂのアーム部１９ｂは、一対のＬ型部材１５ａで囲まれた空間に収まる。なお、鋼管矢板３ａ、３ｂとの接続の際には、第１の鋼管矢板（例えば鋼管矢板３ａ）を設置後、第２の鋼管矢板（例えば鋼管矢板３ｂ）を既設の鋼管矢板の上方から、Ｌ型部材同士がかみ合うように上方から挿入すればよい。 The pair of L-shaped members 15a and the pair of L-shaped members 15b of the steel pipe sheet piles 3a and 3b to be joined are provided to face each other. The base portions 17b of the pair of L-shaped members 15b are disposed between the tips of the arm portions 19b of the pair of L-shaped members 15a, and the arm portions 19b of the L-shaped member 15b are in a space surrounded by the pair of L-shaped members 15a. It will fit. In addition, when connecting with the steel pipe sheet piles 3a and 3b, after installing the first steel pipe sheet pile (for example, the steel pipe sheet pile 3a), the second steel pipe sheet pile (for example, the steel pipe sheet pile 3b) is installed from above the existing steel pipe sheet pile. What is necessary is just to insert from upper direction so that L-shaped members may mesh.
　図２Ｂに示すように、Ｌ型部材１５ａにＬ型部材１５ｂを挿入して、互いにかみ合わせた状態で、Ｌ型部材１５ａ、１５ｂおよび鋼管矢板３ａ、３ｂで囲まれる空間内にコンクリート２３が充填される。コンクリート２３の充填により継手１３の水密性が確保され、接合部の強度が確保される。 As shown in FIG. 2B, with the L-shaped member 15b inserted into the L-shaped member 15a and meshed with each other, the space surrounded by the L-shaped members 15a, 15b and the steel pipe sheet piles 3a, 3b is filled with concrete 23. The The filling of the concrete 23 ensures the water tightness of the joint 13 and ensures the strength of the joint.
　なお、従来の鋼管矢板の接続構造においては、充填性を高めるため、充填材としてモルタルなどが使用されており、骨材入りのコンクリートは使用されていない。これに対し、本実施形態においては、骨材入りのコンクリート２３が内部に充填される。この理由については後述する。また、それぞれのＬ型部材１５ａ、１５ｂにおけるコンクリート２３との接触面には、図示を省略した凹凸を設けておくことが望ましい。これにより、Ｌ型部材１５ａ、１５ｂとコンクリート２３との付着強度がより確保され、接合部におけるせん断耐力が向上する。例えばＬ型部材として縞鋼板を用いることにより凹凸を設けてもよい。 In addition, in the conventional steel pipe sheet pile connection structure, mortar is used as a filler in order to enhance the filling property, and aggregated concrete is not used. On the other hand, in this embodiment, the concrete 23 containing aggregate is filled inside. The reason for this will be described later. In addition, it is desirable to provide unevenness (not shown) on the contact surfaces of the L-shaped members 15a and 15b with the concrete 23. Thereby, the adhesion strength between the L-shaped members 15a and 15b and the concrete 23 is further ensured, and the shear strength at the joint is improved. For example, unevenness may be provided by using a striped steel plate as the L-shaped member.
　図３は、構造体１の下方拡大図であり、水底下部９に設けられた鋼管矢板３を示す。前述の通り、鋼管矢板３は水底５に設けられる。したがって、鋼管矢板３の下方（水底下部９）は水底５に埋設される。水底下部９に位置する継手１３においては、Ｌ型部材１５ｂの基部１７ｂに複数の孔２１が所定間隔をあけて設けられる。すなわち、孔２１は、少なくとも、水底下部９に位置するＬ型部材１５ｂの基部１７ｂに設けられる。 FIG. 3 is a lower enlarged view of the structure 1 and shows the steel pipe sheet pile 3 provided in the bottom 9 of the water bottom. As described above, the steel pipe sheet pile 3 is provided on the bottom 5. Therefore, the lower part (bottom bottom 9) of the steel pipe sheet pile 3 is buried in the bottom 5. In the joint 13 located at the bottom of the water bottom 9, a plurality of holes 21 are provided at predetermined intervals in the base portion 17b of the L-shaped member 15b. That is, the hole 21 is provided at least in the base portion 17b of the L-shaped member 15b located in the bottom 9 of the water bottom.
　次に、孔２１位置における継手１３について、より詳細を説明する。図４Ａ、図４Ｂは、継手１３における孔２１を含む断面図である。図４Ａは鋼管矢板３ａ、３ｂがまっすぐな位置に設けられた状態（すなわち、Ｌ型部材１５ａ、１５ｂが互いに接触せずに設けられた状態）を示す図である。図４Ｂは鋼管矢板３ａ、３ｂが互いに接続方向と略垂直な方向にずれて設置された状態（すなわち、Ｌ型部材１５ａの端部がＬ型部材１５ｂに接触して設けられた状態）を示す図である。 Next, the details of the joint 13 at the position of the hole 21 will be described. 4A and 4B are cross-sectional views including the hole 21 in the joint 13. FIG. 4A is a diagram showing a state in which the steel pipe sheet piles 3a and 3b are provided at straight positions (that is, a state in which the L-shaped members 15a and 15b are provided without being in contact with each other). FIG. 4B shows a state in which the steel pipe sheet piles 3a and 3b are displaced from each other in a direction substantially perpendicular to the connection direction (that is, a state in which the end portion of the L-shaped member 15a is provided in contact with the L-shaped member 15b). FIG.
　前述の通り、継手１３の内部へは骨材２５が含まれるコンクリート２３が充填される。骨材２５は種々の砕石等が使用できる。海砂などの天然骨材や高炉スラグなどの人工骨材を、骨材２５として用いてもよい。ここで、骨材２５は、例えば粗骨材（５ｍｍのふるいを用い、重量で８５％以上がとどまる骨材）であり、粒の大きさは例えば２０ｍｍ程度であることが望ましい。ここで、骨材２５の粒の大きさとは、粗骨材の概ね最大寸法を表す。例えば、骨材２５の粒の大きさが２０ｍｍとは、ＪＩＳ　Ａ　１１０２による粗骨材の粒度の標準によれば、呼び寸法２０ｍｍのふるいによって、ふるいを通る粒の重量百分率が９０～１００％であることを示す。すなわち、粗骨材の粒の大きさは、概ね５～２０ｍｍ程度の粒を含む。 As described above, the inside of the joint 13 is filled with the concrete 23 including the aggregate 25. The aggregate 25 can use various crushed stones. A natural aggregate such as sea sand or an artificial aggregate such as blast furnace slag may be used as the aggregate 25. Here, the aggregate 25 is, for example, a coarse aggregate (an aggregate that uses a 5 mm sieve and remains at 85% or more by weight), and the size of the grains is preferably about 20 mm, for example. Here, the grain size of the aggregate 25 represents the approximate maximum dimension of the coarse aggregate. For example, the particle size of the aggregate 25 is 20 mm. According to the standard of coarse particle size according to JIS A 1102, the weight percentage of particles passing through the sieve is 90 to 100% by the sieve having a nominal size of 20 mm. It shows that there is. That is, the size of the coarse aggregate grains includes grains of about 5 to 20 mm.
　なお、コンクリートによっては、粗骨材と細骨材とが混在して含まれることがあるが、本発明における骨材２５の粒の大きさとは、コンクリートに主に含まれる骨材の上述のＪＩＳによって規定される粒の大きさを指す。たとえば粗粒率または実績率が５０％以上の粗骨材Ａが含まれている場合には、他の細骨材や細粒が含まれていても、その粗骨材Ａの粒のＪＩＳで示される大きさを指す。 Depending on the concrete, coarse aggregate and fine aggregate may be included together. The size of the aggregate 25 in the present invention is the above-mentioned JIS of the aggregate mainly included in the concrete. Refers to the grain size defined by. For example, when the coarse aggregate A having a coarse grain ratio or an actual performance ratio of 50% or more is included, even if other fine aggregates or fine grains are contained, the grain of the coarse aggregate A is JIS Refers to the indicated size.
　図４Ａ、図４Ｂにおいては、骨材２５の一部のみを図示した。また、図４Ａ、図４Ｂにおいては、コンクリート２３が固結する前の状態を示し、骨材２５は継手１３内部で自由に移動可能である。 4A and 4B, only a part of the aggregate 25 is shown. 4A and 4B show a state before the concrete 23 is consolidated, and the aggregate 25 can be freely moved inside the joint 13.
　ここで、図４Ａに示すように、鋼管矢板３ａ、３ｂが互いにまっすぐに対向して設けられる場合において、Ｌ型部材１５ａのアーム部１９ａ先端と、Ｌ型部材１５ｂの基部１７ｂ外面との隙間をＢ、Ｌ型部材１５ｂの基部１７ｂ外面からアーム部１９ｂ先端までの長さをＣ、Ｌ型部材１５ｂのアーム部１９ｂ先端からＬ型部材１５ａの基部１７ａ内面までの距離をＤ、孔２１の径をＥと定義する。 Here, as shown in FIG. 4A, in the case where the steel pipe sheet piles 3a and 3b are provided to face each other straight, a gap between the tip of the arm portion 19a of the L-shaped member 15a and the outer surface of the base portion 17b of the L-shaped member 15b is formed. B, the length from the outer surface of the base portion 17b of the L-shaped member 15b to the tip of the arm portion 19b is C, the distance from the tip of the arm portion 19b of the L-shaped member 15b to the inner surface of the base portion 17a of the L-shaped member 15a is D, and the diameter of the hole 21 Is defined as E.
　同様に、図４Ｂに示すように、鋼管矢板３ａ、３ｂが接続方向に対して略垂直な方向（図中矢印Ｉ方向）に最大にずれが生じた場合において、図４ＡのＢ、Ｄに対応する距離をＢ’、Ｄ’と定義する。さらに、コンクリート２３に含まれる骨材２５の粒の大きさをｄと定義する。 Similarly, as shown in FIG. 4B, when the steel pipe sheet piles 3a and 3b are displaced to the maximum in the direction substantially perpendicular to the connection direction (the direction of arrow I in the figure), they correspond to B and D in FIG. 4A. The distance to be defined is defined as B ′ and D ′. Furthermore, the grain size of the aggregate 25 contained in the concrete 23 is defined as d.
　この際、Ｌ型部材１５ｂがＬ型部材１５ａより外れないようにするためには、鋼管矢板同士の位置が最もずれた図４Ｂの状態で、Ｂ’よりもＣが大きい必要がある。 At this time, in order to prevent the L-shaped member 15b from coming off from the L-shaped member 15a, C needs to be larger than B 'in the state of FIG. 4B where the positions of the steel pipe sheet piles are most displaced.
　また、骨材２５が継手１３内で容易に移動するため（すなわち、コンクリート２３が入りこんで充填されるため）には、骨材２５の移動ルートが骨材２５の大きさに対して十分に大きい必要がある。移動ルートが骨材２５に対して小さいと、骨材２５によってルートが閉塞し、コンクリート２３の充填を妨げるためである。 Further, in order for the aggregate 25 to move easily in the joint 13 (that is, because the concrete 23 enters and is filled), the movement route of the aggregate 25 is sufficiently large with respect to the size of the aggregate 25. There is a need. This is because if the moving route is smaller than the aggregate 25, the route is blocked by the aggregate 25 and the filling of the concrete 23 is prevented.
　ここで、骨材２５の移動ルートとしては、例えば、Ｌ型部材１５ｂのアーム部１９ｂ先端からＬ型部材１５ａの基部１７ａ内面までの隙間（図中矢印Ｇ方向）がある。鋼管矢板同士の位置が最もずれた図４Ｂの状態で、この隙間が最も小さくなり、この状態で骨材２５が移動できればよい。すなわち、Ｄ’がｄよりも十分大きければよく、例えばＤ’がｄの２倍以上であれば、骨材２５がこの位置に詰まることがなく、コンクリート２３の流動の妨げにならないため望ましい。 Here, the movement route of the aggregate 25 includes, for example, a gap (in the direction of arrow G in the figure) from the tip of the arm portion 19b of the L-shaped member 15b to the inner surface of the base portion 17a of the L-shaped member 15a. In the state of FIG. 4B in which the positions of the steel pipe sheet piles are shifted most, it is only necessary that the gap is the smallest and the aggregate 25 can move in this state. That is, it is sufficient that D ′ is sufficiently larger than d. For example, if D ′ is twice or more than d, it is desirable that the aggregate 25 is not clogged at this position and does not hinder the flow of the concrete 23.
　また、骨材２５の移動ルートとしては、この他に孔２１（図中矢印Ｆ方向）がある。したがって、Ｅがｄよりも十分大きければよく、例えばＥがｄの２倍以上であれば、骨材２５がこの位置に詰まることがなく、コンクリート２３の流動の妨げにならないため望ましい。 In addition, as a moving route of the aggregate 25, there is a hole 21 (in the direction of arrow F in the figure). Therefore, it is sufficient that E is sufficiently larger than d. For example, if E is twice or more than d, the aggregate 25 is not clogged at this position and the flow of the concrete 23 is not hindered.
　ここで、前述の通り、Ｌ型部材１５ａのアーム部１９ａ先端と、Ｌ型部材１５ｂの基部１７ｂ外面との隙間は、最大でＢ’となる。この隙間が骨材２５の大きさｄに対して大きいと、骨材２５（コンクリート２３）がこの隙間から外部に流出する。たとえば、水底上部１１（図１Ａ）においては、この隙間の外部には水が存在するため、水中にコンクリート２３が流出する。したがって、水が汚濁される。このため、この隙間からのコンクリート２３の漏えいを防止する必要がある。 Here, as described above, the gap between the tip of the arm portion 19a of the L-shaped member 15a and the outer surface of the base portion 17b of the L-shaped member 15b is B 'at the maximum. When the gap is larger than the size d of the aggregate 25, the aggregate 25 (concrete 23) flows out from the gap. For example, in the water bottom upper part 11 (FIG. 1A), since water exists outside the gap, the concrete 23 flows out into the water. Therefore, water is polluted. For this reason, it is necessary to prevent the leakage of the concrete 23 from this gap.
　ここで、骨材２５のサイズｄがＢ’よりも大きければ、骨材２５がこの隙間に詰まる（図中矢印Ｈ方向）。したがって、骨材２５によってこの隙間が閉塞され、コンクリート２３の流出が抑制される。すなわち、Ｂ’はｄよりも小さいことが望ましい。言い換えれば、Ｂはｄの概ね１／２よりも小さいことが望ましい。 Here, if the size d of the aggregate 25 is larger than B ', the aggregate 25 is clogged in this gap (in the direction of arrow H in the figure). Therefore, the gap is closed by the aggregate 25 and the outflow of the concrete 23 is suppressed. That is, B ′ is preferably smaller than d. In other words, it is desirable that B is smaller than approximately ½ of d.
　次に、鋼管矢板３ａ、３ｂ間の距離が一定とならず、ずれた場合について説明する。図５Ａ、図５Ｂは、継手１３における孔２１位置の断面図である。図５Ａは鋼管矢板３ｂが鋼管矢板３ａ側に最も近づいた位置に設けられた状態を示す図であり、図５Ｂは鋼管矢板３ｂが鋼管矢板３ａとは逆方向に最も遠のいた位置に設けられた状態を示す図である。 Next, the case where the distance between the steel pipe sheet piles 3a and 3b is not constant and is shifted will be described. 5A and 5B are sectional views of the position of the hole 21 in the joint 13. FIG. 5A is a diagram showing a state in which the steel pipe sheet pile 3b is provided at a position closest to the steel pipe sheet pile 3a side, and FIG. 5B is a drawing in which the steel pipe sheet pile 3b is provided at a position farthest away from the steel pipe sheet pile 3a. It is a figure which shows a state.
　図５Ａに示すように、鋼管矢板３ａ、３ｂが互いに近付く方向（図中矢印Ｊ方向）にずれていると、Ｌ型部材１５ｂの先端が鋼管矢板３ａと接触し（またはＬ型部材１５ａの先端が鋼管矢板３ｂと接触し）、それ以上互いに接近することがない。この場合、基部１７ｂおよび鋼管矢板３ａ、３ｂとで囲まれた範囲内にコンクリート２３を充填すると、コンクリート２３は基部１７ｂ同士の間に充填されるとともに、孔２１を通過する（図中矢印Ｋ方向）。このため、対向するＬ型部材１５ａとＬ型部材１５ｂとの間にもコンクリート２３が充填される。 As shown in FIG. 5A, when the steel pipe sheet piles 3a and 3b are displaced in the direction in which they approach each other (the arrow J direction in the figure), the tip of the L-shaped member 15b comes into contact with the steel pipe sheet pile 3a (or the tip of the L-shaped member 15a). In contact with the steel pipe sheet pile 3b) and no further approach. In this case, when the concrete 23 is filled in the range surrounded by the base portion 17b and the steel pipe sheet piles 3a and 3b, the concrete 23 is filled between the base portions 17b and passes through the hole 21 (in the direction of arrow K in the figure). ). For this reason, the concrete 23 is also filled between the L-shaped member 15a and the L-shaped member 15b facing each other.
　この際、前述の通り、Ｌ型部材１５ａ（アーム部１９ａ）の先端とＬ型部材１５ｂの基部１７ｂ外面との間の隙間には、骨材２５が詰まる。このため、この隙間からのコンクリート２３の流出は抑制される。 At this time, as described above, the aggregate 25 is clogged in the gap between the tip of the L-shaped member 15a (arm portion 19a) and the outer surface of the base portion 17b of the L-shaped member 15b. For this reason, the outflow of the concrete 23 from this clearance gap is suppressed.
　次に、図５Ｂに示すように、鋼管矢板３ａ、３ｂが互いに離れた方向（図中矢印Ｎ方向）にずれている場合について説明する。この場合でも、前述の通り、アーム部１９ｂがアーム部１９ａから外れることはないため、鋼管矢板３ａ、３ｂ同士の接続は維持される。 Next, as shown in FIG. 5B, the case where the steel pipe sheet piles 3a and 3b are displaced in directions away from each other (in the direction of arrow N in the figure) will be described. Even in this case, as described above, since the arm portion 19b does not come off from the arm portion 19a, the connection between the steel pipe sheet piles 3a and 3b is maintained.
　アーム部１９ｂと鋼管矢板３ａの側面との間には大きな隙間が形成されるため、コンクリート２３はＬ型部材１５ａ、１５ｂおよび鋼管矢板３ａ、３ｂ側面で囲まれた空間には確実に充填され、骨材２３が詰まらない。 Since a large gap is formed between the arm portion 19b and the side surface of the steel pipe sheet pile 3a, the concrete 23 is reliably filled in the space surrounded by the L-shaped members 15a, 15b and the side surfaces of the steel pipe sheet piles 3a, 3b, The aggregate 23 is not clogged.
　一方、基部１７ｂはアーム部１９ａの外部に露出する。このため、孔２１によって、継手１３の外部と内部とが連通する。したがって、骨材２３を含むコンクリート２３が、孔２１を通過して外部に流出する恐れがある（図中矢印Ｍ方向）。 On the other hand, the base portion 17b is exposed to the outside of the arm portion 19a. For this reason, the hole 21 allows the outside and the inside of the joint 13 to communicate with each other. Therefore, the concrete 23 including the aggregate 23 may flow out through the hole 21 (in the direction of arrow M in the figure).
　しかし、孔２１は、水底下部９（図１Ａおよび図３）のみに設けられるため、継手１３の外部には土砂が存在する。このため、孔２１を通過したコンクリート２３は土砂により流出が抑制される。また、仮にわずかに流出しても、孔２１の周囲は水底５よりも下部であるため、直接水を汚濁させることがない。このため、コンクリート２３の打設によって水が汚れることがない。 However, since the hole 21 is provided only in the bottom 9 of the water bottom (FIGS. 1A and 3), earth and sand exist outside the joint 13. For this reason, the outflow of the concrete 23 that has passed through the holes 21 is suppressed by the earth and sand. Moreover, even if it flows out slightly, since the circumference | surroundings of the hole 21 are lower than the water bottom 5, water is not polluted directly. For this reason, water is not soiled by the placement of the concrete 23.
　次に、水底上部１１（図１Ａ）における継手１３の構成について説明する。前述の通り、水底上部１１においては、継手１３の外部には水が存在する。このため、継手１３からコンクリート２３等が流出すると、これにより水が汚濁する。したがって、コンクリート２３が継手１３外部に流出することを防止する必要がある。本実施形態では、前述の通り、骨材２５の大きさに対して、アーム部１９ａ先端と基部１７ｂとの隙間を小さくしたため、骨材２５によって隙間が埋められ、この隙間からのコンクリート２３の流出が防止される。しかし、コンクリート２３の流出をより確実に防止するため、アーム部１９ａにシール部材を設けることが望ましい。 Next, the configuration of the joint 13 in the upper bottom 11 (FIG. 1A) will be described. As described above, water is present outside the joint 13 in the upper water bottom 11. For this reason, if concrete 23 grade | etc., Flows out from the coupling 13, this will contaminate water. Therefore, it is necessary to prevent the concrete 23 from flowing out of the joint 13. In the present embodiment, as described above, the gap between the distal end of the arm portion 19a and the base portion 17b is reduced with respect to the size of the aggregate 25. Therefore, the gap is filled with the aggregate 25, and the concrete 23 flows out from the gap. Is prevented. However, in order to more reliably prevent the concrete 23 from flowing out, it is desirable to provide a seal member on the arm portion 19a.
　図６Ａ、図６Ｂ、図６Ｃは、アーム部１９ａにシール部材を設けた状態を示す図である。図６Ａに示すように、アーム部１９ａの外面には、アーム部１９ａの先端方向に向けて延在するシール部材２７ａが設けられる。シール部材２７ａは、弾塑性変形可能な材質であり、例えば薄鋼板などの金属製やゴム等の樹脂等が使用できる。シール部材は、鋼管矢板３の上方から少なくとも水底上部１１（図１Ａ）の範囲に設けられる。水底下部９（図１Ａ）においては、前述の通り、周囲の土砂がシール部材の役割を果たすためである。 6A, FIG. 6B, and FIG. 6C are views showing a state in which a seal member is provided on the arm portion 19a. As shown in FIG. 6A, a seal member 27a is provided on the outer surface of the arm portion 19a so as to extend toward the distal end of the arm portion 19a. The seal member 27a is a material that can be elastically plastically deformed. For example, a metal such as a thin steel plate or a resin such as rubber can be used. The seal member is provided in a range from the upper side of the steel pipe sheet pile 3 to at least the upper bottom 11 (FIG. 1A). This is because, in the lower water bottom portion 9 (FIG. 1A), the surrounding earth and sand plays a role of a sealing member as described above.
　なお、図６Ａに示すようにシール部材２７ａを予め湾曲して設けてもよい。また、図６Ｂに示すように、シール部材２７ｂをアーム部１９ａに対してまっすぐに設けてもよい。いずれにしても、シール部材は、接合対象の鋼管矢板３ｂ側の基部１７ｂと接触して変形し、アーム部１９ａと基部１７ｂとの隙間を塞ぐことが可能である。以下の説明では、シール部材２７ａを用いた例を説明する。 In addition, as shown in FIG. 6A, the sealing member 27a may be curved in advance. As shown in FIG. 6B, the seal member 27b may be provided straight with respect to the arm portion 19a. In any case, the seal member can be deformed in contact with the base portion 17b on the steel pipe sheet pile 3b side to be joined, thereby closing the gap between the arm portion 19a and the base portion 17b. In the following description, an example using the seal member 27a will be described.
　図６Ｃは、鋼管矢板３ａ、３ｂが接続された状態を示す図である。図６Ｃに示すように、一対のＬ型部材１５ａのアーム部１９ａには、互いに内側方向にアーム部１９ａより突出するシール部材２７ａが設けられる。シール部材２７ａの先端は、接合対象である鋼管矢板３ｂの基部１７ｂ外面と接触する。シール部材２７ａは弾塑性変形可能であるため、鋼管矢板３ａ、３ｂのずれ（図４Ｂのようなずれ）に対しても追従し、アーム部１９ａと基部１７ｂとの隙間が塞がれる。したがって、骨材２５によりアーム部１９ａと基部１７ｂとの隙間が塞がれても、わずかに流出するコンクリート２３（図中矢印Ｏ方向）をより確実に防ぐことができる。 FIG. 6C is a diagram showing a state in which the steel pipe sheet piles 3a and 3b are connected. As shown in FIG. 6C, the arm portion 19a of the pair of L-shaped members 15a is provided with a seal member 27a protruding from the arm portion 19a in the inner direction. The tip of the seal member 27a contacts the outer surface of the base portion 17b of the steel pipe sheet pile 3b to be joined. Since the seal member 27a can be elasto-plastically deformed, the seal member 27a also follows the displacement of the steel pipe sheet piles 3a and 3b (displacement as shown in FIG. 4B), and the gap between the arm portion 19a and the base portion 17b is closed. Therefore, even if the gap between the arm portion 19a and the base portion 17b is closed by the aggregate 25, the concrete 23 that flows out slightly (in the direction of arrow O in the figure) can be more reliably prevented.
　図７Ａは、シール部材２７ａが設けられた状態のＬ型部材１５ａを示す。図７ＡはＬ型部材１５ａの接合方向側から見た正面図であり、図７Ｂは図７ＡのＰ－Ｐ線断面図であり、図７Ｃは図７ＡのＱ－Ｑ線断面図である。 FIG. 7A shows the L-shaped member 15a in a state where the seal member 27a is provided. 7A is a front view seen from the joining direction side of the L-shaped member 15a, FIG. 7B is a cross-sectional view taken along line PP in FIG. 7A, and FIG. 7C is a cross-sectional view taken along line QQ in FIG.
　シール部材２７ａは、鋼管矢板３の軸方向に、Ｌ型部材１５ａに沿って設けられる。シール部材２７ａの上方にはテーパ部２９が設けられる。テーパ部２９は、一対のシール部材２７ａの先端同士の間隔が上方に向かって大きくなるように形成される。すなわち、シール部材２７ａの上方には、上方に向かってシール部材２７ａの幅（水平方向長さ）が徐々に小さくなるテーパ部２９が形成される。 The seal member 27 a is provided along the L-shaped member 15 a in the axial direction of the steel pipe sheet pile 3. A tapered portion 29 is provided above the seal member 27a. The tapered portion 29 is formed so that the distance between the tips of the pair of seal members 27a increases upward. That is, a tapered portion 29 is formed above the seal member 27a so that the width (horizontal direction length) of the seal member 27a gradually decreases upward.
　図７Ｂに示すように、鋼管矢板３ｂ上端近傍では、シール部材２７ａの水平方向長さが短い。たとえば、アーム部１９ａの外面に設けられたシール部材２７ａは、上端近傍においてはアーム部１９ａの先端から突出しておらず、一対のアーム部１９ａ同士の間隔が確保される。すなわち、図７Ｂにおいては、接合対象のＬ型部材１５ｂを点線で図示したが、Ｌ型部材１５ｂの基部１７ｂは、シール部材２７ａとは接触せず、アーム部１９ａと接触する。このため、上方からＬ型部材１５ｂ（鋼管矢板３ｂ）をＬ型部材１５ａ（鋼管矢板３ａ）に嵌めこむ際に、シール部材２７ａがＬ型部材１５ｂと接触しない。このためＬ型部材１５ｂの挿入性に影響を与えることがなく、作業性に優れる。 7B, the horizontal length of the seal member 27a is short near the upper end of the steel pipe sheet pile 3b. For example, the seal member 27a provided on the outer surface of the arm portion 19a does not protrude from the tip end of the arm portion 19a in the vicinity of the upper end, and the interval between the pair of arm portions 19a is ensured. That is, in FIG. 7B, the L-shaped member 15b to be joined is illustrated by a dotted line, but the base portion 17b of the L-shaped member 15b does not contact the seal member 27a but contacts the arm portion 19a. Therefore, when the L-shaped member 15b (steel pipe sheet pile 3b) is fitted into the L-shaped member 15a (steel pipe sheet pile 3a) from above, the seal member 27a does not contact the L-shaped member 15b. For this reason, the insertability of the L-shaped member 15b is not affected, and the workability is excellent.
　一方、図７Ｃに示すように、シール部材２７ａのテーパ部２９の下方（水面よりも下方に位置する部位）は、シール部材２７ａはアーム部１９ａ先端より隙間を塞ぐのに十分な長さ分だけ突出しており、基部１７ｂと接触する。このため、シール部材２７ａによってアーム部１９ａと基部１７ｂとの隙間が塞がれる。したがって、コンクリートがこの隙間から流出することがない。 On the other hand, as shown in FIG. 7C, the seal member 27a is below the taper portion 29 of the seal member 27a (the portion located below the water surface) by a length sufficient for the seal member 27a to close the gap from the tip of the arm portion 19a. It protrudes and contacts the base 17b. For this reason, the gap between the arm portion 19a and the base portion 17b is closed by the seal member 27a. Therefore, concrete does not flow out of this gap.
　なお、以上の実施例においては、孔２１を水底下部９のみに設け、シール部材２７ａを水底上部１１にのみ設けたが、これに限られない。たとえば、シール部材２７ａを水底下部９にまで設けてもよく、また、孔２１を水底上部１１に形成してもよい。孔２１を水底上部１１に形成しても、孔２１の大きさを骨材２５の大きさよりも小さくしたり、シール部材２７ａと組み合わせることで、コンクリートの漏えいを防止することができる。 In the above embodiment, the hole 21 is provided only in the lower water bottom 9 and the seal member 27a is provided only in the upper water bottom 11. However, the present invention is not limited to this. For example, the sealing member 27a may be provided up to the bottom bottom 9, and the hole 21 may be formed in the bottom top 11. Even if the hole 21 is formed in the upper water bottom 11, leakage of the concrete can be prevented by making the size of the hole 21 smaller than the size of the aggregate 25 or combining it with the seal member 27a.
　本実施形態にかかる鋼管矢板の接合方法によれば、簡易に鋼管矢板同士を接合できるとともに、コンクリートの充填性に優れ、かつ、コンクリートの水中への流出を確実に防止することができる。また、Ｌ型部材１５ａ、１５ｂで囲まれた断面積が大きいため、接合部において高いせん断耐力を得ることができる。 According to the steel pipe sheet pile joining method according to the present embodiment, the steel pipe sheet piles can be easily joined to each other, the concrete filling property is excellent, and the concrete can be reliably prevented from flowing out into water. Moreover, since the cross-sectional area enclosed by the L-shaped members 15a and 15b is large, a high shear strength can be obtained at the joint.
　特に、鋼管矢板３ａ、３ｂ同士の接合を、Ｌ型部材１５ａ、１５ｂを用いた継手１３により行うため、例えば一対のＬ型部材１５ｂを一対のＬ型部材１５ａの間に挿入すればよく、接合作業性に優れる。また、充填材であるコンクリート２３には骨材２５が含まれ、Ｌ型部材１５ａのアーム部１９ａ先端と、Ｌ型部材１５ｂの基部１７ｂ外面との隙間が、骨材２５の大きさよりも小さい。このため、この隙間に骨材２５が詰まり、それ以上のコンクリート２３の流出を抑制することができる。 In particular, since the steel pipe sheet piles 3a and 3b are joined by the joint 13 using the L-shaped members 15a and 15b, for example, a pair of L-shaped members 15b may be inserted between the pair of L-shaped members 15a. Excellent workability. Further, the concrete 23 as the filler includes an aggregate 25, and the gap between the tip of the arm portion 19 a of the L-shaped member 15 a and the outer surface of the base portion 17 b of the L-shaped member 15 b is smaller than the size of the aggregate 25. For this reason, the aggregate 25 is clogged in this gap, and further outflow of the concrete 23 can be suppressed.
　また、Ｌ型部材１５ｂのアーム部１９ｂ先端と、Ｌ型部材１５ａの基部１７ａ内面との隙間が、骨材２５の大きさに対して十分大きい。このため、コンクリート２３がＬ型部材１５ａ、１５ｂの間の空間に確実に充填される。 Further, the gap between the distal end of the arm portion 19b of the L-shaped member 15b and the inner surface of the base portion 17a of the L-shaped member 15a is sufficiently large with respect to the size of the aggregate 25. For this reason, the concrete 23 is reliably filled in the space between the L-shaped members 15a and 15b.
　また、少なくとも水底下部９においては、基部１７ｂに孔２１を形成すれば、孔２１内にコンクリート２３が入りこみ、コンクリート２３とＬ型部材１５ｂとの付着強度を高めることができる。このため、接合部において高いせん断耐力を得ることができる。また、孔２１の大きさが、骨材２５の大きさに対して十分に大きいため、Ｌ型部材１５ａ、１５ｂの間の空間へコンクリート２３を打設した際に、孔２１をコンクリート２３が通る。このため、より確実にコンクリート２３を空間に充填することができる。 Further, at least in the bottom 9 of the bottom, if the hole 21 is formed in the base portion 17b, the concrete 23 enters the hole 21, and the adhesion strength between the concrete 23 and the L-shaped member 15b can be increased. For this reason, a high shear strength can be obtained at the joint. Further, since the size of the hole 21 is sufficiently larger than the size of the aggregate 25, the concrete 23 passes through the hole 21 when the concrete 23 is placed in the space between the L-shaped members 15a and 15b. . For this reason, the concrete 23 can be more reliably filled into the space.
　また、水底上部１１にシール部材２７ａが設けられる場合、アーム部１９ａ先端と基部１７ｂ外面との隙間からのコンクリート２３の流出をより確実に抑制することができる。したがって、水中へのコンクリート２３の流出による水の汚濁を防止することができる。 Moreover, when the sealing member 27a is provided in the water bottom upper part 11, the outflow of the concrete 23 from the clearance gap between the arm part 19a front-end | tip and the base part 17b outer surface can be suppressed more reliably. Accordingly, it is possible to prevent water contamination due to the outflow of the concrete 23 into the water.
　また、シール部材２７ａが上部にテーパ部２９を有する場合、Ｌ型部材１５ａにＬ型部材１５ｂを挿入する際に、シール部材２７ａが挿入の妨げになることがない。このため、テーパ部２９に沿ってＬ型部材１５ｂを挿入することができる。 Further, when the seal member 27a has the taper portion 29 at the top, the seal member 27a does not hinder the insertion when the L-type member 15b is inserted into the L-type member 15a. For this reason, the L-shaped member 15 b can be inserted along the tapered portion 29.
　また、Ｌ型部材１５ａ、１５ｂの内面（コンクリート２３との接触面）に、あらかじめ凹凸が形成される場合、コンクリート２３とＬ型部材１５ａ、１５ｂとの付着強度が向上する。したがって、接合部のせん断耐力が向上する。 Moreover, when unevenness is formed in advance on the inner surfaces (contact surfaces with the concrete 23) of the L-shaped members 15a and 15b, the adhesion strength between the concrete 23 and the L-shaped members 15a and 15b is improved. Accordingly, the shear strength of the joint is improved.
　以上説明した一実施形態にかかる鋼管矢板同士を接合する接続構造は、言い換えると、第１鋼管矢板と、前記第１鋼管矢板と隣り合う第２鋼管矢板と、第１アーム部と第１基部とを有し、前記第１アーム部が対向するように前記第１鋼管矢板の側面に接合された一対の第１のＬ型部材と、第２アーム部と第２基部とを有し、前記第２基部が対向するように前記第２鋼管矢板の側面に接合され、前記一対の第１のＬ型部材の内部に配設された一対の第２のＬ型部材と、前記一対の第１のＬ型部材及び前記一対の第２のＬ型部材とによって囲まれた空間に打設され、骨材を含むコンクリート部と、を含み、前記第１アーム部と前記第２基部との隙間は、前記骨材の粒の大きさよりも小さく、前記第２アーム部と前記第１基部との隙間は、前記骨材の粒の大きさの２倍以上である鋼管矢板同士の接続構造である。
　前記第２のＬ型部材の少なくとも一部の側面には、軸方向に所定間隔で複数の孔が設けられてもよい。
　また、前記孔の大きさは、前記骨材の粒の大きさの２倍以上であってもよい。
　また、前記第１アーム部の少なくとも一部には、前記第２のＬ型部材側に向けて延在し、前記第２のＬ型部材と接触するシール部材が設けられていてもよい。
　また、前記シール部材は、前記第１のＬ型部材の上端から下方に向けて徐々に幅が大きくなるテーパ部を有してもよい。
　また、前記第１のＬ型部材および前記第２のＬ型部材は、前記コンクリート部に接触する接触面を有し、前記第１のＬ型部材および前記第２のＬ型部材の少なくとも一方の前記接触面には、凹凸が形成されていてもよい。 In other words, the connection structure for joining the steel pipe sheet piles according to the embodiment described above is the first steel pipe sheet pile, the second steel pipe sheet pile adjacent to the first steel pipe sheet pile, the first arm portion, and the first base portion. A pair of first L-shaped members joined to the side surfaces of the first steel pipe sheet pile so that the first arm portions face each other, a second arm portion and a second base portion, A pair of second L-shaped members that are joined to the side surfaces of the second steel pipe sheet pile so that two base portions face each other, and are disposed inside the pair of first L-shaped members; A concrete portion including an aggregate placed in a space surrounded by an L-shaped member and the pair of second L-shaped members, and the gap between the first arm portion and the second base portion is The clearance between the second arm portion and the first base portion is smaller than the size of the aggregate particles, and the aggregate A connection structure of a steel pipe sheet piles between at least twice the grain size.
A plurality of holes may be provided at predetermined intervals in the axial direction on at least a part of the side surface of the second L-shaped member.
The size of the hole may be twice or more the size of the aggregate grain.
In addition, a seal member that extends toward the second L-shaped member and contacts the second L-shaped member may be provided on at least a part of the first arm portion.
Further, the seal member may have a tapered portion whose width gradually increases downward from the upper end of the first L-shaped member.
The first L-shaped member and the second L-shaped member have a contact surface that contacts the concrete portion, and at least one of the first L-shaped member and the second L-shaped member. Irregularities may be formed on the contact surface.
　以上、添付図を参照しながら、本発明の実施の形態を説明したが、本発明の技術的範囲は、前述した実施の形態のみに限定されない。当業者であれば、特許請求の範囲に記載された技術的思想の範疇内において各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 The embodiment of the present invention has been described above with reference to the accompanying drawings, but the technical scope of the present invention is not limited to the above-described embodiment. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.
　本発明によれば、高いせん断耐力を有し、構造が簡易で連結作業性に優れ、水の汚濁を防止可能な鋼管矢板継手を提供することができる。このため、産業上の利用可能性は大きい。 According to the present invention, it is possible to provide a steel pipe sheet pile joint having a high shear strength, a simple structure, excellent connection workability, and capable of preventing water contamination. For this reason, industrial applicability is great.
１　　構造体
３、３ａ、３ｂ　　鋼管矢板
５　　水底
７　　底版
９　　水底下部
１１　　水底上部
１３　　継手
１５ａ、１５ｂ　　Ｌ型部材
１７ａ、１７ｂ　　基部
１９ａ、１９ｂ　　アーム部
２１　　孔
２３　　コンクリート
２５　　骨材
２７ａ、２７ｂ　　シール部材
２９　　テーパ部 DESCRIPTION OF SYMBOLS 1 Structure 3, 3a, 3b Steel pipe sheet pile 5 Water bottom 7 Bottom plate 9 Water bottom lower part 11 Water bottom upper part 13 Joint 15a, 15b L-shaped member 17a, 17b Base part 19a, 19b Arm part 21 Hole 23 Concrete 25 Aggregate 27a, 27b Seal member 29 Tapered part

Claims (8)

  1. 　第１鋼管矢板の側方に互いに内方に向けて接合された一対の第１のＬ型部材と、
    　前記第１鋼管矢板と隣り合う第２鋼管矢板の側方に、前記第１のＬ型部材と対向するように設けられ、互いに外方に向けて接合された一対の第２のＬ型部材と、
    を具備し、
    　一対の前記第２のＬ型部材は、一対の前記第１のＬ型部材の内部に配設され、
    　一対の前記第１のＬ型部材および一対の前記第２のＬ型部材とで囲まれた空間には骨材を含むコンクリートが打設され、
    　前記第１のＬ型部材の先端と前記第２のＬ型部材との隙間は、前記骨材の粒の大きさよりも小さく、
    　前記第２のＬ型部材の先端と前記第１のＬ型部材との隙間は、前記骨材の粒の大きさの２倍以上である
    ことを特徴とする鋼管矢板同士の接続構造。     A pair of first L-shaped members joined inwardly to the sides of the first steel pipe sheet pile,
    A pair of second L-shaped members provided on the side of the second steel pipe sheet pile adjacent to the first steel pipe sheet pile so as to face the first L-shaped member and joined to each other outward. ,
    Comprising
    The pair of second L-shaped members are disposed inside the pair of first L-shaped members,
    Concrete containing aggregate is placed in the space surrounded by the pair of first L-shaped members and the pair of second L-shaped members,
    The gap between the tip of the first L-shaped member and the second L-shaped member is smaller than the size of the aggregate particles,
    A connection structure between steel pipe sheet piles, wherein the gap between the tip of the second L-shaped member and the first L-shaped member is at least twice the size of the aggregate grains.
  2. 　前記第２のＬ型部材の少なくとも一部の側面には、軸方向に所定間隔で複数の孔が設けられる
    ことを特徴とする請求項１記載の鋼管矢板同士の接続構造。     The connection structure between steel pipe sheet piles according to claim 1, wherein a plurality of holes are provided at predetermined intervals in the axial direction on at least a part of a side surface of the second L-shaped member.
  3. 　前記孔の大きさは、前記骨材の粒の大きさの２倍以上である
    ことを特徴とする請求項２記載の鋼管矢板同士の接続構造。     The steel pipe sheet pile connection structure according to claim 2, wherein the size of the hole is at least twice the size of the aggregate grain.
  4. 　前記第１のＬ型部材の先端部近傍の少なくとも一部には、前記第２のＬ型部材側に向けて、前記第２のＬ型部材と接触可能なシール部材が設けられる
    ことを特徴とする請求項１から請求項３のいずれか一項に記載の鋼管矢板同士の接続構造。     A seal member that can come into contact with the second L-shaped member is provided at least in the vicinity of the distal end portion of the first L-shaped member toward the second L-shaped member. The connection structure of the steel pipe sheet piles as described in any one of Claims 1-3 which do.
  5. 　前記シール部材は、前記第１のＬ型部材の上端から下方に向けて徐々に幅が大きくなるテーパ部を有する
    ことを特徴とする請求項４記載の鋼管矢板同士の接続構造。     The steel pipe sheet pile connection structure according to claim 4, wherein the seal member has a tapered portion whose width gradually increases downward from an upper end of the first L-shaped member.
  6. 　前記第１のＬ型部材および前記第２のＬ型部材の少なくとも一方の前記コンクリートの接触面には凹凸が形成される
    ことを特徴とする請求項１から請求項３のいずれか一項に記載の鋼管矢板同士の接続構造。     4. The unevenness is formed on a contact surface of the concrete of at least one of the first L-shaped member and the second L-shaped member. 5. Connection structure of steel pipe sheet piles.
  7. 　複数の鋼管矢板が略鉛直方向に水中に設置され、鋼管矢板同士が継手で接合された構造体であって、
    　第１鋼管矢板の側方に互いに内方に向けて接合された一対の第１のＬ型部材と、前記第１鋼管矢板と隣り合う第２鋼管矢板の側方に、前記第１のＬ型部材と対向するように設けられ、互いに外方に向けて接合された一対の第２のＬ型部材とを具備する接続構造を用い、
    　一対の前記第２のＬ型部材は、一対の前記第１のＬ型部材に嵌りこみ、
    　一対の前記第１のＬ型部材および一対の前記第２のＬ型部材とで囲まれた空間には骨材を含むコンクリートが打設され、
    　前記第１のＬ型部材の先端と前記第２のＬ型部材との隙間は、前記骨材の粒の大きさよりも小さく、
    　前記第２のＬ型部材の先端と前記第１のＬ型部材との隙間は、前記骨材の粒の大きさの２倍よりも大きく、
    　前記接続構造の、少なくとも水底下への埋設部においては、前記第２のＬ型部材側面に軸方向に所定間隔で孔が設けられ、
    　前記継手構造の、少なくとも水底よりも上方部においては、前記第１のＬ型部材の外方先端部近傍に前記第２のＬ型部材側に向けて、前記第２のＬ型部材と接触可能なシール部材が設けられる
    ことを特徴とする構造体。     A plurality of steel pipe sheet piles are installed in water in a substantially vertical direction, and the steel pipe sheet piles are joined by a joint,
    A pair of first L-shaped members joined inward to each other on the side of the first steel pipe sheet pile, and on the side of the second steel pipe sheet pile adjacent to the first steel pipe sheet pile, the first L type Using a connection structure including a pair of second L-shaped members which are provided so as to face the members and are joined outwardly,
    The pair of second L-shaped members are fitted into the pair of first L-shaped members,
    Concrete containing aggregate is placed in the space surrounded by the pair of first L-shaped members and the pair of second L-shaped members,
    The gap between the tip of the first L-shaped member and the second L-shaped member is smaller than the size of the aggregate particles,
    The gap between the tip of the second L-shaped member and the first L-shaped member is greater than twice the size of the aggregate particles,
    In the connection structure, at least in the buried portion under the water bottom, holes are provided at predetermined intervals in the axial direction on the side surface of the second L-shaped member,
    In the joint structure, at least above the bottom of the water, it is possible to contact the second L-shaped member toward the second L-shaped member in the vicinity of the outer tip of the first L-shaped member. A structure characterized in that a sealing member is provided.
  8. 　前記第１のＬ型部材および前記第２のＬ型部材の少なくとも一方の前記コンクリートの接触面には凹凸が形成されることを特徴とする請求項７記載の構造体。 The structure according to claim 7, wherein irregularities are formed on a contact surface of the concrete of at least one of the first L-shaped member and the second L-shaped member.
PCT/JP2010/003971 2009-06-19 2010-06-15 Structure for connecting steel pipe sheet piles, and steel pipe sheet pile structure WO2010146836A1 (en)

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