JP2006037580A - Coupling structure of steel element and steel sheet pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a high rigid and strong coupling structure at a low cost by constituting the coupling structure connected to a steel element such as a steel sheet pile or the like as a double arm fitting coupling of a U shape formed by simply bending a compact single member, and to obtain high water cutoff performance by constituting, as a double wall, only the inside and outside of a coupling section for which high water cutoff performance has to be secured. <P>SOLUTION: The coupling structure connected to a steel element such as a steel sheet pile or the like constitutes the double arm fitting coupling 26 which is formed by bending a steel plate 27 with the fitting coupling 28 into a substantially U shape via a first bending section 31 and a second bending section 32, and the bending section of the double arm fitting coupling 26 is connected by welding to the end edge 29 of a plate member 30 such as the steel sheet pile or the like. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a steel element joint structure used for steel retaining sheets, steel sheet piles, storage tanks and the like used for earth retaining, foundation foundations, underground walls, water-impervious walls used in the fields of civil engineering and marine structures, and made of steel. Related to sheet piles.

[Prior art and problems]
In steel sheet piles, one of the steel elements that make up the underground continuous wall, the joint structure has a hook type, double claw type, and handle claw type depending on the purpose from both the application and economic aspects. Hot-rolled types, various cold-formed types, and pipe-pipe, pipe-T, and angle-T-shaped welded build-up types for steel pipe sheet piles have been developed ( The various joints are hereinafter collectively referred to as fitting joints).

  In recent years, environmental awareness has increased, and various vertical impermeable walls have been developed in response to the need for containment of contaminated soil and water shielding needs on land and at sea surface disposal sites. The appearance of steel sheet piles that are rich in water barrier properties and that are structurally strong and low in cost is expected.

  As shown in FIGS. 12A, 12B, and 12C, conventional steel sheet piles include a linear steel sheet pile 1, a U-type steel sheet pile 2, and a hat-type steel sheet pile 3, each of which is hot-rolled. Is molded. There is a lightweight steel sheet pile 4 of the bending type shown in FIG. 12 (d), and this type is manufactured by cold forming. These types can only have one-to-one fitting joints, can not constitute a closed space of a size necessary for filling with mortar to ensure reliable water shielding and joint strength of joints, There is a limit to the structural strength. Further, the lightweight steel sheet pile 4 has a shape like a one-stroke drawing, and does not have a large rigidity like an H-shaped steel, and it is difficult to secure a self-supporting stability when placed on a hard ground or a wave sea area. There is a problem. In any case, in the structure of the steel sheet piles 1 to 4, it is difficult to satisfy the recently required high performance in terms of driving performance due to insufficient rigidity to the hard ground or the like, and the water stoppage of the joint.

  In order to solve the above problem, as shown in FIGS. 13 (a) to 13 (d), a male joint 6 and a female joint 7 having various cross-sectional shapes or steel pipe joints 6a and 7a were welded to the side of the steel pipe 5. A steel pipe sheet pile 8 having a fitting joint of a so-called pipe-pipe type, pipe-T type, and angle-T type shape is known. In this steel pipe sheet pile 8, the fitting joint is loose, such as mortar. It is impossible to form a sealed space for filling, and there is a limit to reliable water shielding and structural strength. The joint portion 10 is difficult to form a closed space necessary for filling mortar or the like, and there is a limit to the reliable filling work, and there is a problem in water stoppage. Therefore, although a device such as applying a water-swellable water-stopping material to the inside of the female joint 7 has been applied, the water-swellable water-stopping material may be peeled off at the male joint 6 when placing the sheet pile, There was a problem with the reliability of waterstop.

  Furthermore, as shown in FIG. 14, there is a steel sheet pile 12 in which two linear sheet piles 1 are arranged in parallel at intervals, and both linear steel sheet piles 1 are integrated by welding a web steel plate 11. In this case, the two linear steel sheet piles 1 function as upper and lower flanges in the H-section steel. Further, as shown in FIG. 15, a built-up type steel sheet pile 15 in which a half-shaped body 14 of a linear steel sheet pile having a fitting joint 16 at the tip is welded to a corner portion of a square steel pipe 13 to form a double H shape. It has been proposed (Japanese Patent Publication No. 3-76370).

  When constructing a retaining wall or the like with the double flange type steel sheet piles 12 and 15 shown in FIGS. 14 and 15, one of the upper and lower connecting joints 18 formed by connecting the fitting joints 16 and one of the square steel pipes 13. A closed space 19 is formed between the sides, and by filling the closed space 19 with a filler such as mortar, a triple water-stop structure of the two connecting joints 18 and the closed space 19 can be formed, and the water stop can be improved. effective. However, the double wall structure constituted by the double-flange type steel sheet piles 12 and 15 of FIGS. 14 and 15 has a problem that the entire wall is a double wall, which increases the weight of the steel material and increases the cost. There is.

  Further, a build-up type steel sheet pile 15 in which a straight sheet pile half body 14 is welded to a corner portion of a square steel pipe (or round steel pipe) 13 in FIG. Since the shape has a closed cross-section, the tip is likely to close when it is press-fitted into the ground, and press-fitting is often difficult.

  In addition, as shown in FIG. 16, a fitting joint 23 with an arm 22 formed by cutting a straight steel sheet pile in a direction parallel to the flange 21 is disposed on both side ends of the upper and lower flanges 21 of the H-shaped steel 20 in a conventional example that can be noted. Steel sheet pile 24 is known (Japanese Patent Publication No. 4-28849). In addition, there has been proposed a steel sheet pile in which H-shaped steels are connected and welded with upper and lower flanges and fitted joints are provided at both ends thereof (Japanese Patent Laid-Open No. 7-279163). However, as shown in FIG. 16 (b), the steel material constituting the wall body is constituted by connecting the fitting joint 23 in the steel sheet pile 24 constituting the double wall structure composed of the upper and lower flanges 21 of the H-shaped steel. A closed space 19 is formed inside the two upper and lower connecting joints 18 and the web 25 of the H-shaped steel 20, and the two connecting joints 18 and the closed space 19 are filled by filling the closed space 19 with a filler such as mortar. However, it has the effect of improving the water-stopping property, but the entire wall is a double wall and the weight of the steel material is large, resulting in an increase in cost.

Furthermore, when using the H-shaped steel 20 by hot rolling at a low cost for the steel sheet pile 24 in FIG. 16, only a flange having a smaller flange width (W1) than the web width (W) can be manufactured, and the flange has a short side. Since the connecting joint 18 is arranged in a direction parallel to the wall 21, the sheet pile width (W2) serving as the wall (wall surface) cannot be increased, and the joint length per wall area is also increased. Therefore, there is a limit to the reduction in the number of steel sheet piles, a long construction period is required, and at the same time, when performing water shielding treatment such as mortar filling at joints and application of water swellable waterstop, Become.
Japanese Patent Publication No. 3-76370 Japanese Patent Publication No. 4-28849 JP 7-279163 A

  H-shaped shape (Fig. 14) with web sheet steel welded to straight sheet piles as upper and lower flanges, and a double H-shaped shape (Fig. 15) by welding and joining a straight sheet metal half-cut to the corner of a square steel pipe Steel sheet piles (Japanese Patent Publication No. 3-76370) and steel sheet piles (FIG. 15) (Japanese Patent Publication No. 4-28849) in which fitting joints are arranged on both sides of the flange of the H-shaped steel in the direction parallel to the flanges have been proposed. These can form a strong joint connection structure by filling a closed space formed by joint connection with an amorphous hardener such as mortar or concrete.

  However, these can be used to form a double water-blocking structure by filling each closed space surrounded by connecting joints with a water-blocking material to ensure a large water-blocking structure and joint strength. It has a double-wall structure consisting of flanges. For this reason, the steel material weight is large and the degree of processing is high, resulting in an increase in cost. In addition, these parallel flange type joints have a shape that protrudes linearly, so that they have low rigidity against the competing forces that occur due to inaccuracy of the joints and the tilting and twisting of sheet piles. It flexibly follows deformation in the direction of right angle (Y axis) (weak axis direction), but the rigidity in the protrusion (X axis) direction is high (strong axis direction). You may fall.

The present invention solves the above-mentioned problems, can construct a highly rigid and strong joint structure at low cost, and can reliably fill mortar, concrete, etc. in a closed space with high sealing performance, Because it can follow the deformation flexibly with reduced rigidity, it can be configured so that the competing force at the time of sheet pile driving becomes excessive and it will not fall into a difficult situation, and it is a compact single member It is designed to be double-coupled as a double-arm fitting joint formed into a U shape by simple bending.

  In order to achieve the above object, the steel sheet pile of the present invention is configured as follows.

  1st invention is a joint structure joined to a steel element, and this joint structure is constituted by a double-arm fitting joint formed by bending a steel plate having fitting joint portions at both ends into a U shape. It is characterized by.

  The second invention is characterized in that, in the first invention, the steel sheet having fitting joints at both ends is made of a straight steel sheet pile.

  A third invention is characterized in that, in the first or second invention, a closed space formed by connecting a pair of opposing double-arm fitting joints is a filling pocket of an amorphous material.

  A fourth invention is characterized in that, in the first to third inventions, a water-stopping filler is disposed on one or both fitting joints of a pair of opposing double-arm fitting joints.

  A fifth invention is characterized in that, in the first to fourth inventions, a steel sheet pile obtained by welding and joining a U-shaped curved portion to an edge portion of a steel plate member.

  A sixth invention is characterized in that in the first to fourth inventions, a steel pipe sheet pile formed by welding and joining a U-shaped curved portion to a side surface of a steel pipe.

  A seventh invention is characterized in that in the first to fourth inventions, a square steel pipe sheet pile formed by welding and joining a U-shaped curved part to a corner part of a square steel pipe.

  According to the first invention, a steel sheet having fitting joints at both ends is curved and formed into a U-shape, and the joint structure that constitutes a double-arm fitting joint allows U to be easily bent by a compact single member. As a double-armed fitting joint formed in a letter shape, the joint is doubly connected, and a highly rigid and strong joint structure can be constructed at low cost. In addition, it is easy to attach a shear key etc. for integration with mortar etc. inside the fitting joint of the double arm formed in U shape, and it is a closed space with high sealing performance constituted by this connection Filling mortar, concrete, etc. can be performed with high reliability, and a strong joint structure can be reliably constructed.

  Furthermore, by forming a U-shaped joint by curving a steel plate having a fitting joint at both ends to form a U-shaped fitting joint, only the protruding right angle (Y-axis) (weak axis direction) direction of the fitting joint In addition, an eccentric distance from the fitting joint to the joint fixing part also occurs in the protruding (X-axis) direction, so the rigidity can be lowered and flexibly follow the deformation. The competing power at the time of placing the sheet pile will not be excessive and the situation will be difficult.

  According to the second invention, the joint structure of the first invention is such that the steel sheet having fitting joints at both ends is made of a straight steel sheet pile, so that the straight sheet pile manufactured by hot rolling has a very high joint strength at a low cost. By forming this into a two-arm fitting joint by simple processing by cold forming, a strong joint connection structure can be constructed at low cost.

  According to the third invention, the closed space formed by connecting the double-arm fitting joints of the joint structure of the first or second invention is the amorphous material filling pocket, so that the two-arm fitting joints are connected. It is possible to construct an irregular material filling pocket by reliably discharging soil from the highly sealed closed space, and strong joint connection without worrying about outflow of irregular shaped material such as mortar and concrete to the outside of the pocket when filling The structure can be configured reliably.

  According to the fourth aspect of the invention, by providing a filler on one or both of the pair of double-armed fitting joints of the first to third aspects of the invention, the fitting joint portion is connected to form a highly water-tight dry A closed space is formed, and by inserting a TV camera or a fiberscope into this closed space, it is possible to remove the joint portion with high reliability, and to monitor damage and water shielding. Moreover, in addition to disposing a filler on one or both of the fitting joints, a double or triple water stop structure combined with an indeterminate material into a closed space formed by connecting double arm fitting joints As a result, an extremely high water-impervious joint structure can be constructed. In addition, a water-swelling water-stopping material (resin) is disposed as the filler, and a water-impervious structure is configured simply by injecting water or a water-saturated gel into a closed space formed by connecting fitting joints. This makes it possible to construct an extremely reliable joint portion water shielding structure.

  According to the fifth invention, since the joint structure of the first to fourth inventions is arranged on the side surface of the steel plate to constitute the steel sheet pile, the steel sheet pile joint is sequentially fitted from the ground surface while being fitted with the two arms. With medium press-fitting, it is possible to construct a pocket for filling irregular shaped material by reliably removing sediment from the highly sealed closed space formed by connecting double fitting joints, and filling irregular shaped material such as mortar and concrete. It is possible to reliably form a strong joint connection structure with high water shielding without fear of outflow outside the pocket.

According to the sixth and seventh inventions, the steel sheet pile is configured by arranging the joint structure of the first to fourth inventions on the side surface of the steel pipe and the corner portion of the square steel pipe, so in addition to the high rigidity of the steel pipe and the square steel pipe Thus, the double-arm fitting joint formed by bending the steel plate into a U-shape has high rigidity, and a steel sheet pile having high underground press-fit property can be constructed at low cost by synergistic action of each of the high rigidity.

  Embodiments of the present invention will be described below with reference to the drawings.

  1A to 1D show a U-shaped double-arm fitting joint 26 according to the first embodiment, and the double-arm fitting joint 26 has a U-shape as shown in FIG. A fitting joint portion 28 is provided at both ends of the curved steel plate 27. This double arm fitting joint 26 is welded and joined to an end edge portion 29 such as a steel sheet pile or steel pipe sheet pile, which is a steel element for constructing the underground continuous wall. A steel plate member 30 shown in FIGS. 1C and 1D is a part of a steel sheet pile.

  1A and 1B show a double-arm fitting joint 26a in a stage before forming, and fitting joint portions 28 are provided at both ends of a flat steel plate 27a. Bending is performed twice to form the first bent portion 31 in the intermediate portion, and the second bent portion 32 is formed on both sides thereof, and the entire portion is bent into a substantially U shape. The double-arm fitting joint 26 in which the female side and the male side are paired by welding the steel plate 7 of the double-arm fitting joint 26 formed into a substantially U shape in this way to the end edge portion 29 of the steel plate member 30. A steel element such as a steel pipe sheet pile having In FIG. 1, the female side fitting joint part 28a is comprised with the grooved steel pipe, and the male side fitting joint part 28b is comprised with the T-shaped member.

  As shown in FIG. 1 (c), the pair of female-arm and male-side double-arm fitting joints 26 are brought close to each other, and as shown in FIG. 1 (d), the female-side fitting joint portion 28a is fitted on the male side. A joint joint structure 33 is formed by fitting the joint portion 28b. By connecting the female-side and male-side double-arm fitting joints 26 in this way, a closed space 34 is formed in the inside, so that the closed space 34 is filled with an amorphous material as necessary. To do. Further, a water stop filler is filled in the gap formed in the fitting portion of the female fitting joint portion 28a and the male fitting fitting portion 28b as necessary.

According to the double-arm fitting joint 26 of the first embodiment, a double-arm fitting joint 26 is formed by bending a steel plate 27 having fitting joint portions 28 at both ends into a U-shape. A steel element such as a steel sheet pile is manufactured by welding to the steel plate member 31. As shown in FIG. As a double-armed fitting joint formed in a letter shape, the joint is doubly connected, and a highly rigid and strong joint structure can be constructed at low cost. Further, it is easy to attach a shear key or the like for integration with a mortar filled in the closed space 34 inside the steel plate 27 formed in a U-shape, and is configured by connecting a double arm fitting joint 26. Filling the closed space 34 with high airtightness with mortar, concrete, or the like can be performed with high reliability, and a strong joint structure can be reliably configured.

  Furthermore, according to the double arm fitting joint 26 of the first embodiment, the fitting joint portion 28 is not only in the protruding right angle (Y axis) (weak axis direction) direction but also in the protruding (X axis) direction. Since an eccentric distance is generated from the joint 28 to the joint fixing portion (that is, the edge 29 of the steel plate member 30 to be welded), the rigidity of the steel plate 27 is reduced, and the fitting joint portion 28 becomes the mating fitting joint. Since the portion 28 can flexibly follow the deformation, the competing force at the time of placing the steel sheet pile constituted by the steel plate member 30 does not become excessive and does not fall into a difficult situation. If it demonstrates in a comparative example, since it has the shape of the parallel flange type joint shown in FIGS. 14-16 etc. or the shape which protrudes linearly, it will produce with respect to the precision defect of a joint part, the inclination at the time of sheet pile driving, and a twist. For competition, the deformation follows flexibly in the perpendicular (Y-axis) direction with low rigidity, but since the rigidity is high in the protruding (Y-axis) direction, the competition is excessive and it becomes difficult to place. However, according to the double arm fitting joint 26 of the first embodiment, such a problem can be avoided.

  The fitting joint 28 of the double-arm fitting joint 26 according to the first embodiment has various cross-sectional shapes shown in FIGS. 2A to 2J in addition to the male and female fitting joint portions 28a and 28b shown in FIG. The fitting joint 35 and fitting joints 36 having various cross-sectional views shown in FIGS. 3A to 3G may be provided at both ends of the steel plate 27.

  4A to 4D show an example in which the U-shaped double-arm fitting joint 26 according to the second embodiment is configured by a straight steel sheet pile 26b having fitting joints 28 at both ends of a steel plate 27. FIG. The second embodiment is illustrated corresponding to FIGS. 1A to 1D showing the first embodiment, and elements corresponding to the first embodiment are denoted by the same reference numerals.

  According to the U-shaped double-arm fitting joint 26 that bends and forms the plate portion 27 of the straight steel sheet pile 26b of Embodiment 2 into a U-shape, the straight sheet pile 26b by hot rolling is a low cost and extremely high joint. A stronger joint connection structure can be constructed at a low cost by forming the double arm fitting joint 26 by a simple bending process using cold forming.

  FIG. 5A shows the third embodiment, and shows a state in which a closed space 34 formed by connecting the U-shaped double-arm fitting joint 26 of the first embodiment is filled with an amorphous material 37. FIG. 5 (b) shows the fourth embodiment, and shows a state where the closed space 34 formed by connecting the U-shaped double-arm fitting joint 26 of the second embodiment is filled with an amorphous material 37. FIG.

  When the underground continuous wall is constructed via the connection joint portion 33 shown in Embodiments 3 and 4 of FIGS. 5 (a) and 5 (b), the closed space 34 with high hermeticity is an indeterminate material due to reliable sediment discharge. 37 filling pockets can be configured, and it is possible to reliably form a strong joint connection structure without worrying about outflow of the irregular shaped material 37 such as mortar and concrete to the outside of the pocket when filling, and two sets of fitting joints 28 and 28 and a non-circular material 37 filled in one closed space 34, a triple water-stop structure is formed.

  6 (a) and 6 (b) show the fifth embodiment. In the U-shaped double-arm fitting joint 26 of the second embodiment, a water-swelling waterproofing material or the like is stopped in the inner gap of the fitting joint portion 28. The example which affixed the aqueous filler 38 is shown. According to the fifth embodiment, when the fitting joint portions 28 of the opposing U-shaped double-arm fitting joint 26 are fitted to each other and the steel sheet pile is driven into the ground, water is inserted into the gap between the fitting joint portions 28. As the water enters, the water-stopping filler 38 expands and fills the gap between the fitting joints 28.

  According to the fifth embodiment, the gap of the fitting joint portion 28 is filled with water-stopping, for example, in the case of constructing an underground continuous wall in the case of constructing a waste disposal site by placing a steel sheet pile in the ground in a closed state. Since it is filled with the material 36, it can prevent reliably that the waste water etc. which were contaminated from the joint part flow out outside. Further, when the gap of the fitting joint portion 28 is filled with the water-stopping filler 36, a highly water-tight dry closed space 34 configured by connecting the fitting joint portion 28 is configured, By inserting a television camera or a fiberscope (not shown) into the closed space 34, it is possible to monitor the disconnection, damage, and water shielding with high reliability. It should be noted that the water-stop filler 36 may be attached to the inside of both the fitting joint portions 28 facing each other. Further, in the closed space 34 formed by connecting the double-arm fitting joint 26 shown in FIG. 6, a water-impervious structure is formed simply by injecting water or a water-saturated gel. With the structure, it is possible to construct a highly reliable joint portion water shielding structure.

  As described above, according to the fifth embodiment, it is configured by connecting double fitting joints when press-fitting in the ground from the ground surface sequentially while fitting the fitting joint portions 28 of the two-arm fitting joint 26 of the steel sheet pile. It is possible to construct an irregular shaped material filling pocket by reliably removing sediment from the highly sealed closed space, and there is no fear of spilling irregular shaped material such as mortar or concrete, and there is no fear of spilling out of the pocket when filling, and water shielding is high. A strong joint connection structure can be reliably configured.

  Fig.7 (a)-(d) shows Embodiment 6-9. In Embodiment 6 of FIG. 7A, a double-arm fitting joint 26 having a female fitting joint portion 28a is provided at one end of a wide steel plate member 30, and a male fitting fitting portion 28b is provided at the other end. An example in which a steel sheet pile 39 is configured by providing the double arm fitting joint 26 is shown. The embodiment 7 in FIG. 7B is provided with a double-arm fitting joint 26 having a female-side fitting joint portion 28a made of a joint steel pipe at one end of a steel plate member 30 having a side protrusion 40 at the intermediate portion. An example in which a steel sheet pile 39 is configured by providing a double-arm fitting joint 26 having a male fitting joint portion 28b made of a small-diameter joint steel pipe at the other end is shown. Embodiment 8 of FIG. 7 (c) is a fitting joint made of joint steel pipes at both ends of a steel plate member 30 having a side protrusion 40 protruding further larger than the side protrusion 40 of FIG. The example which provided the double arm fitting joint 26 which has the part 28 and 28, and comprised the steel sheet pile 39 is shown. In the ninth embodiment of FIG. 7 (d), the left and right sides of the wide steel plate member 30 having a plurality of lateral protrusions 40 in the middle are fitted with female side fittings on the left and right sides so as to have opposite positions on the left and right sides. A double-arm fitting joint 26 having a joint portion 28a and a male-side fitting joint portion 28b is provided, and the female-side and male-side fitting joint portions 28 are opposite to each other at the left and right double-arm fitting joints 26. The example which provided in the relationship and comprised the steel sheet pile 39 is shown.

  According to Embodiments 6 to 9 of FIGS. 7A to 7D, the steel sheet pile 39 is configured by providing the double arm fitting joints 26 at both end edges of the wide steel plate member 30, and therefore less steel sheet piles. With 39, a long continuous underground wall can be constructed, and the joint portion can be constructed with high rigidity and at a low cost.

  8A to 8D show a steel sheet pile 39 according to Embodiments 10 to 13, and the structure of the wide steel plate member 30 is Embodiments 6 to 9 shown in FIGS. 7A to 7D. The same reference numerals are given to the common parts. Moreover, the both-arms edge of each steel plate member 30 is provided with the same double arm fitting joint 26 formed by bending a straight steel sheet pile as in the second embodiment of FIG. According to Embodiments 10 to 13 of FIGS. 8A to 8D, a long underground continuous wall can be constructed with less steel sheet piles 39 as in Embodiments 6 to 9, and the joint portion has high rigidity. It can be constructed firmly and at low cost.

  FIG. 9A shows a fourteenth embodiment. A double arm fitting joint 26 formed by bending a straight steel sheet pile at a side symmetrical position of the steel pipe 41 is welded (a U-shaped curved portion of the steel plate 27). A steel pipe sheet pile 43 with a double arm fitting joint 26 is formed by welding. When the underground pipe wall 44 is constructed by connecting the steel pipe sheet piles 43 according to the fourteenth embodiment as shown in FIG. 9B, the double arm fitting joint 26 configured between the steel pipe sheet piles 43 is made to be highly rigid. It is possible to construct a structure that is strong, low cost and excellent in water-stopping properties.

  FIGS. 10A and 10B show the fifteenth embodiment and correspond to the fourteenth embodiment shown in FIGS. 9A and 9B. That is, in the fifteenth embodiment, instead of the steel pipe 41 of the fourteenth embodiment, the square steel pipe sheet pile 46 is configured by providing the double arm fitting joints 26 at the corners of the square steel pipe 45. Other configurations of the fifteenth embodiment are the same as those of the fourteenth embodiment, and common portions are denoted by common reference numerals. When the underground continuous wall 44 is constructed according to the fifteenth embodiment, the double-arm fitting joint 26 configured between the square steel pipe sheet piles 46 can be constructed to have a high rigidity, a low cost, and an excellent waterproof property. Also.

Referring to FIG. 11, a steel sheet pile 47 using the double arm fitting joint 26 according to the first embodiment (FIG. 1).
The manufacturing process and the process of constructing an underground continuous wall by placing it on the ground will be described.

(1) A steel sheet pile 47 with a double-arm fitting joint 26 is manufactured by welding the U-shaped curved portion of the double-arm fitting joint 26 along both edges of the steel plate member 30. In addition, an amorphous water-swelling water-stopping material (polymer) is applied in advance to the inner surface of the fitting joint 28 as water shielding for the coupling joint portion.
(2) The underground sheet wall 47 is constructed by connecting and driving the steel sheet pile 47 via the fitting joint 28 with the vibro hammer 51 suspended from the ground surface 48 by the wire 50 of the crawler crane 49.
(3) Jet water is sprayed from the spray nozzle at the tip of the hose 54 led out from the pump car 53 to excavate and remove the soil in the ground of the closed space 34 formed by the connection of the double arm fitting joint 26, and the interior is washed with water. And purify.
(4) An amorphous hardener 37 such as asphalt mortar (or cement mortar) is charged from the mixer wheel 55 through the hose 56 from the upper part of the closed space 34.
(5) The triple impermeable wall structure is completed by curing the amorphous curing material 37 filled in the closed space 34.

The case of construction of a well foundation is also carried out in the same manner as above (the figure is omitted).
(1) A steel sheet pile 47 with a double-arm fitting joint 26 is manufactured by welding the U-shaped curved portion of the double-arm fitting joint 26 along both edges of the steel plate member 30. As water shielding for the coupling joint, an indeterminate water-swellable water-stopping material (polymer) is applied to the inner surface of the fitting joint 28 in advance.
(2) A steel sheet pile 47 is connected and driven through a joint with a vibro hammer from the ground surface to construct an underground wall. A rebar as a shear key is welded and installed in advance on the inner surface of the steel plate 27 of the double arm fitting joint 26 as necessary.
(3) Excavation of ground soil in the closed space surrounded by the coupling joint formed by coupling of the fitting joint and the pair of double arm fitting joints 26 is excavated, and the inside is washed and purified.
(4) Fill concrete from the top of the closed space.
(5) Filled concrete and steel sheet piles in a closed space are integrated to complete a well foundation with a continuous underground wall structure.

According to the present embodiment, since the joint structure that joins the steel element constituting the underground continuous wall such as the steel sheet pile is constituted by the double-arm fitting joint 26, the joint portion has a high rigidity and a strong joint structure and is low in cost. And can be filled with mortar, concrete, etc. with high reliability in a closed space with high airtightness. Further, according to the double arm fitting joint 26, the rigidity of the fitting joint 8 is lowered and flexible, and can follow the mating fitting joint 28, so that the competing force at the time of placing the steel sheet pile can be increased. It will not be too difficult to place. Moreover, as a double arm fitting joint formed in a U-shape by simple bending of a compact single member, it is double connected and water-stopping is perfect.

(A), (b) is a plan view of a stage before forming the double-arm fitting joint according to Embodiment 1, and (c) is a steel sheet pile or steel pipe sheet pile, which is a steel element. The top view of the aspect weld-joined to the edge part, (d) is a top view of the aspect which connected a pair of double arm fitting joint. Drawing (a)-(j) is a top view showing other examples of a fitting joint part. Drawing (a)-(g) is a top view showing other examples of a joint member. (A), (b) is a plan view of a pre-molding stage of a double arm fitting joint according to Embodiment 2, and (c) is a steel sheet pile or a steel pipe sheet pile that is a steel element. The top view of the aspect weld-joined to the edge part, (d) is a top view of the aspect which connected a pair of double arm fitting joint. Drawing (a), (b) is a plane of a steel sheet pile with a double arm fitting joint according to Embodiments 3 and 4. (A), (b) is a top view which shows the aspect before the connection of a pair of double arm fitting joint which concerns on Embodiment 5, and after a connection. Drawing (a)-(d) is a top view of a steel sheet pile with a double arm fitting joint concerning Embodiments 6-9. Drawing (a)-(d) is a top view of the steel sheet pile with a double arm fitting joint concerning Embodiments 10-13. (A) is a top view of the steel pipe sheet pile with a double arm fitting joint which concerns on Embodiment 14, (b) is a top view of wall bodies, such as a retaining wall comprised by connecting the said steel pipe sheet pile. (A) is a top view of the steel pipe sheet pile with a double arm fitting joint which concerns on Embodiment 15, (b) is a top view of wall bodies, such as a retaining wall comprised by connecting the said steel pipe sheet pile. (A) is explanatory drawing explaining the process which drives the steel sheet pile which concerns on Embodiment 1 to a ground, and constructs an underground continuous wall, (b) is a top view of an underground continuous wall. (A)-(d) is a top view which shows four examples of the conventional steel sheet pile. (A) is a top view of the conventional steel pipe sheet pile, (b), (c), (d) is an enlarged plan view which shows three examples of the joint part. It is a top view of the conventional double flange type steel sheet pile which connects two linear sheet piles with a web. A plan view of a conventional double flange type steel sheet pile formed by welding a half-cut body of a straight sheet pile to the corner of a square steel pipe, (b) is a wall body such as a retaining wall constructed by connecting the steel sheet piles FIG. (A) is a plan view of a conventional double-flange type steel sheet pile obtained by welding a half-cut body of a straight sheet pile in parallel to the flanger to an H-shaped steel flange, and (b) is a connection of the steel sheet pile. It is a top view of wall bodies, such as a retaining wall comprised.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Straight-type steel sheet pile 2 U-type steel sheet pile 3 Hat-type steel sheet pile 4 Light steel sheet pile 5 Steel pipe 6 Male joint 7 Female joint 9 Reinforcement 10 Joint part
DESCRIPTION OF SYMBOLS 11 Web steel sheet 12 Steel sheet pile 13 Square steel pipe 14 Steel sheet pile half-cut body 15 Steel sheet pile 16 Fitting joint 17 Joint part 18 Connection joint 19 Closed space 20 H-shaped steel 21 Upper and lower flanges 22 Arm 23 Fitting joint 24 Steel sheet pile 25 Web 26 Double Arm fitting joint 27 Steel plate 27a Flat steel plate 28 Fitting joint portion 28a Female fitting joint portion
28b Male fitting joint part 29 End edge part 30 Steel plate member 31 First bent part 32 Second bent part 33 Connection joint part 34 Closed space 35 Fitting joint 36 Fitting joint 37 Amorphous material 38 Water-stop filler 39 Steel Sheet pile 40 Side projection 41 Steel pipe 42 Welded portion 43 Steel pipe sheet pile 44 Underground continuous wall 45 Square steel pipe 46 Square steel pipe sheet pile 47 Steel sheet pile 48 Ground surface 49 Crawler crane 50 Wire 51 Vibro hammer
52 underground continuous wall
53 Pump car 54 Hose 55 Mixer car 56 Hose

Claims (7)

  A joint structure for joining to a steel element, wherein the joint structure is constituted by a double-arm fitting joint formed by bending a steel plate having a fitting joint portion at both ends into a U-shape. .   2. The joint structure according to claim 1, wherein the steel sheet having fitting joint portions at both ends is a straight steel sheet pile.   The joint structure according to claim 1 or 2, wherein a closed space formed by connecting a pair of opposing two-arm fitting joints is a filling pocket of an amorphous material.   The joint structure according to any one of claims 1 to 3, wherein a water-stopping filler is disposed on one or both fitting joints of a pair of opposing double-arm fitting joints.   A steel sheet pile characterized by welding the U-shaped curved portion of the joint structure according to any one of claims 1 to 4 to an edge portion of a steel plate member.   A steel pipe sheet pile characterized by welding the U-shaped curved portion of the joint structure according to any one of claims 1 to 4 to a side surface of the steel pipe.   A square steel pipe sheet pile characterized by welding and joining the U-shaped curved part of the joint structure according to any one of claims 1 to 4 to a corner part of a square steel pipe.

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