JP6590253B2 - Steel sheet pile joint fixing bracket - Google Patents

Description

  The present invention is strong and easy so that a joint portion between steel sheet piles of a steel sheet pile structure such as a retaining wall made of a plurality of steel sheet piles is not displaced by earth pressure only by tightening a plurality of fastening bolts. It can be fixed to.

  Steel sheet piles are installed in the soil with the joints provided at both ends of each steel sheet pile crossing each other, so that the retaining wall for excavation work or sheet pile structures such as revetments and breakwaters U-shaped steel sheet piles, hat-shaped steel sheet piles, etc. are mainly used for this type of steel sheet pile.

  By the way, in the case of the U-shaped steel sheet pile, since the joints provided at the end portions of the respective cross sections are connected to each other, they are coupled to each other. Because of the shearing force (see Fig. 1 (b)), the cross-sectional performance such as the secondary moment of inertia (I) and the cross-sectional system number (Z) required for the design deteriorates (hereinafter this reduction rate is referred to as `` joint efficiency ''). Called).

  In general, the cross-sectional secondary moment (I) in the study of deformation is effective at 45% of the total effective cross-sectional moment, and the cross-sectional system number (Z) in the study of bending stress is effective at 60% of the total effective cross-sectional system. Yes.

  Conventionally, as a method of preventing the reduction in joint efficiency, the upper ends of a plurality of U-shaped steel sheet piles connected to each other are integrally connected and fixed by concrete over about 30 cm from the upper end, or There are known methods of welding and fixing the excavated cross-section side of the joint from the upper end of the steel sheet pile by about 50 cm. According to these methods, the cross-sectional secondary moment and the cross-sectional system number can be improved to 80% of the total cross-section effective. it can.

JP2013-19232A JP 2014-214582 A

  However, the method of connecting and fixing the steel sheet pile heads with concrete is diverse in the main construction, but concrete formwork, reinforcement reinforcement and reinforcement, concrete placement, etc. There were many problems such as the field work, the construction period was likely to be prolonged, and the cost increased.

  On the other hand, the method of welding and fixing the joints between the steel sheet piles requires the inside of each joint part to be welded one by one in the direction of the sheet pile axis, and the welded part has a curved surface with a gap. Therefore, there is a problem that welding is difficult to perform, and welding is difficult and requires a lot of time and labor, and that the construction period is unavoidable.

  The present invention has been made to solve the above-described problems, and by simply tightening a plurality of fastening bolts, a joint portion between steel sheet piles of a steel sheet pile structure such as a retaining wall made of a plurality of steel sheet piles. It is an object of the present invention to provide a steel sheet pile joint fixing bracket that can be firmly and easily fixed so as not to cause a shift due to earth pressure.

  The present invention relates to a steel sheet pile attached to a joint portion between steel sheet piles installed adjacent to each other in the steel sheet pile driving direction by engaging the joints provided at both ends of the cross section of the steel sheet pile main body. It is an invention of a joint part fixing bracket, the bracket main body provided with a hollow part including the upper end of the joint part over a certain length in the sheet pile axis direction, and the screw hole provided in the side part of the bracket body And a plurality of fastening bolts screwed together so as to sandwich the joints from both sides.

  The hollow part that encloses the joint part of the steel sheet pile is the type that is formed in a cap shape so that the upper end part of the joint part is enclosed in the sheet pile axis direction (see Fig. 2). A type that is formed in a slit shape so as to be sandwiched from both sides (see Figs. 5 and 6), and a rising part that extends from the joint and the joint of each steel sheet pile to form the steel sheet pile body of the steel sheet pile from both sides There is a type that is formed in a slit shape so as to be sandwiched (see FIGS. 5 and 6).

  In particular, the latter two types of joint fixing brackets cannot be installed at the same depth due to the hardness of the ground where the steel sheet pile is installed, so that the upper end between adjacent U-shaped steel sheet piles cannot be installed. It is suitable for fixing a joint portion between U-shaped steel sheet piles having a step in the portion.

  The plurality of tightening bolts are screwed symmetrically in the sheet pile driving direction and the direction perpendicular to the sheet pile driving direction on both sides of the hollow portion, so that the entire joint portion can be uniformly tightened and fixed ( (See FIG. 2). Furthermore, the fastening bolts can be adjusted in degree of fixation by being screwed together at intervals in the sheet pile axis direction. Further, the joint efficiency can be adjusted by increasing or decreasing the number of tightening bolts as required.

  According to the steel sheet pile joint fixing bracket of the present invention, the joint efficiency between the steel sheet piles adjacent to each other can be firmly fixed by simply tightening a plurality of tightening bolts, thereby improving joint efficiency.

  Also, there is no welding or rebar, formwork or concrete work when installing steel sheet piles, and there is no generation of scrap when removing steel sheet piles, cutting welded parts or cutting steel sheet pile heads. Therefore, it is possible to greatly shorten the construction period and reduce the construction cost by saving labor in the field work. Furthermore, since it can be attached and detached, it can be used repeatedly and has excellent versatility.

Fig. 1 (a) is a plan view, Fig. 1 (a) shows a steel sheet pile joint fixing bracket attached to a retaining wall composed of a plurality of U-shaped steel sheet piles and a joint between each U-shaped steel sheet pile. (b) is a perspective view of a steel sheet pile joint. Fig. 2 (a) is a side view, Fig. 2 (b) is a cross-sectional view taken along the line II in Fig. 2 (a), and Fig. 2 (c) is adjacent. FIG. 3 is a cross-sectional view taken along the line II in FIG. 2 (a), showing a state installed at a joint portion between U-shaped steel sheet piles. FIG. 3 is a plan view of the joint fixing bracket illustrated in FIG. 2. FIG. 4 (a) is a side view, and FIG. 4 (b) is an end view of the bolt shaft portion. FIG. 5 (a) is a plan view, FIG. 5 (b) is a view taken in the direction of sheet pile placement, and FIG. FIG. 5 (c) is a view taken along the arrow line in FIG. 5 (a), viewed in a direction orthogonal to the sheet pile driving direction. FIG. 6 (a) is a plan view, FIG. 6 (b) is a view taken in the direction of sheet pile placement, and FIG. 6 (a) is a view taken along the arrow line of FIG. 6 (a). FIG. 6 (c) is a view taken along the arrow line in FIG. 6 (a), viewed in a direction orthogonal to the sheet pile driving direction.

  1 to 4 illustrate a joint fixing bracket attached to a joint between a retaining wall made of a plurality of U-shaped steel sheet piles and each U-shaped steel sheet pile.

  In the figure, a plurality of U-shaped steel sheet piles 1 engage each other with joints 2 and 2 formed at both ends of each steel sheet pile cross-section, and the cross-sectional shape is alternately arranged in a symmetrical shape to make a sheet pile. It is installed adjacent to each other in the direction of placement. In addition, a joint fixing bracket 3 is attached to a joint A between the U-shaped steel sheet piles 1 and 1 for rigidly connecting the joints 2 to each other.

  The joint 2 of each U-shaped steel sheet pile 1 includes a rising portion 5 that forms an end portion in the sheet pile driving direction of a steel sheet pile main body 4 that has a substantially U-shaped cross section, and a sheet pile from the tip of the rising portion 5. A section substantially continuous in the sheet pile axis direction from the flange 6 projecting in the placing direction and the claws 7 projecting obliquely so as to intersect the sheet pile placing direction on the rising portion 5 side from the tip of the flange 6 It is formed in a groove shape. That is, the entrance to the groove is narrow and gradually widens toward the back (see FIG. 2 (c)).

  As shown in FIG. 2 (b), the joints 2 and 2 of the adjacent U-shaped steel sheet piles 1 and 1 have both rising portions 5 and 5 facing each other in the sheet pile driving direction, and flanges 6 and 6 Is opposed to the direction orthogonal to the sheet pile driving direction, and the claws 7 and 7 are meshed with each other diagonally in a direction intersecting with the sheet pile driving direction.

  The joint portion fixing bracket 3 includes a bracket main body 8 that encloses the upper end portion of the joint portion A, and a plurality of tightening bolts 9 and 10 that are screwed into the side portions of the bracket main body 8.

  The metal fitting body 8 has a cylindrical hollow portion 11 that encloses a joint portion A between adjacent U-shaped steel sheet piles 1 and 1 in a downward direction from the upper end over a certain length, and has a cap shape that opens directly below. Is formed.

  Moreover, the recessed part 12 and 12 opened to the U-shaped steel sheet pile 1 and 1 side adjacent to a side part are formed, and the rising part 5 and 5 of the U-shaped steel sheet pile 1 and 1 adjacent to the back part of the said recessed part 12 and 12 are formed. Is formed with slits 13 and 13 through which.

  Further, on the side portion of the metal fitting body 8, a plurality of screw holes 14 and 14 and screw holes 15 penetrating in the sheet pile driving direction and the direction orthogonal to the sheet pile driving direction on the excavation side and the ground pile side of the joint portion A, respectively. 15 are formed symmetrically on both sides of the hollow portion 11, respectively. A plurality of screw holes 14, 14 and 15, 15 are formed at intervals in the axial direction of the metal fitting body 8.

  The tightening bolts 9 and 9 are screwed into the screw holes 14 and 14, and the tightening bolts 10 and 10 are screwed into the screw holes 15 and 15, respectively. The tips of the tightening bolts 9 and 9 are in contact with the side surfaces of the rising portions 5 and 5 of the joints 2 and 2, and the tips of the tightening bolts 10 and 10 are in contact with the side surfaces of the flanges 6 and 6.

  In such a configuration, the fastening bolts 9 and 9 and the fastening bolts 10 and 10 are firmly tightened, so that the joints 2 and 2 between the adjacent steel sheet piles 1 and 1 act on the joint portion A by earth pressure. The joints 2 and 2 are rigidly connected so as not to be easily displaced by the bending shear force.

  The tightening bolts 9 and 10 are both made of high-strength steel and have sharp tip protrusions as shown in FIGS. 4 (a) and 4 (b) on the tip surface of the shaft portion. As a result, when the bolt is strongly tightened, the protrusion at the tip bites into the rising portion 5 of the joint 2 and the side surface of the flange 6 so that the displacement of the joints 2 and 2 can be reliably prevented.

  Figures 5 (a), (b), and (c) are adjacent because the adjacent U-shaped steel sheet piles cannot be installed at the same depth due to the situation of the ground where the steel sheet piles are installed (such as the hardness of the ground). The joint fixing bracket used when a step is generated at the upper end portion between U-shaped steel sheet piles, that is, when the heavens of the U-shaped steel sheet piles are not aligned, is illustrated.

  In the figure, a joint fixing bracket 16 is screwed into a metal fitting body 18 having a slit-like hollow portion 17 containing a joint portion A between adjacent U-shaped steel sheet piles 1, 1 and a side portion of the metal fitting body 18. A plurality of tightening bolts 19 are provided.

  The metal fitting body 18 is viewed in a direction perpendicular to the sheet pile driving direction from a vertical portion 18a extending vertically in the sheet pile axial direction and an inclined portion 18b extending slightly upward in the sheet pile driving direction from the upper end portion of the vertical portion. It is formed in a substantially square shape. The hollow portion 17 is formed to communicate with the substantially central portion of the vertical portion 18a in the sheet pile axis direction.

  Also, a plurality of screw holes 20, 20 are formed symmetrically at regular intervals in the sheet pile axis direction on both sides of the vertical portion 18a of the metal fitting body 18, and each screw hole screw hole 20, 20 communicates with the hollow portion 17. ing. The tightening bolts 21 and 21 are screwed into the screw holes 20 and 20, respectively.

  In addition, both side surface portions of the vertical portion 18a are formed in a downwardly descending step shape, and along with this, the short tightening bolts 21 are sequentially screwed into the screw holes 20 of each step, so that each step When the fastening bolts 21 are tightened, they do not interfere with each other.

  Reference numeral 22 denotes a reinforcing rib for increasing the rigidity of the metal fitting body 18 and is formed continuously on both sides of the hollow portion 17 from the vertical portion 18a to the inclined portion 18b of the metal fitting body 18.

  In such a configuration, adjacent U-shaped steel sheet piles 1, 1 are clamped by clamping a plurality of fastening bolts 21, 21 and clamping the flanges 6, 6 of the joints 2, 2 meshed with each other in the hollow portion 17. The joint part A is firmly fixed so as not to shift.

  The tightening bolts 21 and 21 are made of high-strength steel, and sharp projections as shown in FIGS. 4 (a) and 4 (b) are formed on the tip surface of the shaft portion.

  As a result, when the bolt is strongly tightened, the protrusion at the tip bites into the rising portion 5 of the joint 2 and the side surface of the flange 6 so that the displacement of the joints 2 and 2 can be reliably prevented.

  Figures 6 (a), (b), and (c) show that the adjacent U-shaped steel sheet piles cannot be installed at the same depth due to the hardness of the ground where the steel sheet piles are installed. The joint part fixing bracket used when the level | step difference has arisen in the upper end part of, ie, when the heavens of a U-shaped steel sheet pile are not aligned is illustrated.

  In the figure, a joint fixing bracket 22 includes a pair of sandwiching plates 23 and 23 forming a slit-like hollow portion 11 that encloses a joint portion A between adjacent U-shaped steel sheet piles 1 and 1, and the sandwiching plates 23 and 23. A plurality of tightening bolts 24, 24 respectively screwed to the side portions are provided.

  The sandwiching plates 23 and 23 are symmetrically arranged on both sides of the joint portion A between the adjacent U-shaped steel sheet piles 1 and 1 to form a slit-shaped hollow portion 11. Both ends of the sandwiching plates 23, 23 extend to the rising portions 5, 5 side along the rising portions 5, 5 of the adjacent U-shaped steel sheet piles 1, 1, respectively, and are bolt tightening portions 23a of the fastening bolts 24, 24. , 23a.

  A plurality of screw holes 25, 25 are formed in the bolt tightening portions 23a, 23a symmetrically and at regular intervals in the sheet pile axis direction, and the tightening bolts 24, 24 are respectively screwed into the screw holes 25, 25. .

  Further, the pair of sandwiching plates 23, 23 are formed between the bolt fastening portions 23a, 23a at the upper end portion of the U-shaped steel sheet pile 1 on the deeply installed side of the adjacent U-shaped steel sheet piles 1, 1. It is integrally formed through the connecting portion 23b.

  In such a configuration, by tightening a plurality of tightening bolts 24 and 24 and firmly holding the rising portions 5 and 5 of the adjacent U-shaped steel sheet piles 1 and 1, between the adjacent U-shaped steel sheet piles 1 and 1. The joint portion A is firmly fixed so as not to shift.

  The present invention is strong and easy so that a joint portion between steel sheet piles of a steel sheet pile structure such as a retaining wall made of a plurality of steel sheet piles is not displaced by earth pressure only by tightening a plurality of fastening bolts. Can be fixed to.

1 U-shaped steel sheet pile 2 Joint 3 Joint fixing bracket 4 Steel sheet pile body 5 Rising part 6 Flange 7 Claw 8 Bracket body 9 Tightening bolt
10 Tightening bolt
11 Hollow part
12 Recess
13 Slit
14 Screw hole
15 Screw hole
16 Fitting fixing bracket
17 Concave part
18 Bracket body
19 Tightening bolt
20 Grip part
21 Reinforcing rib
22 Fitting fixing bracket
23 Holding plate
23a Bolt tightening part
24 Tightening bolt
25 Screw holes

Claims (4)

Fitting each other respectively provided at an end portion of the rising portion forming the opposite ends of the sheet pile striking arrangement direction of the steel sheet pile body, between the steel sheet pile which is located adjacent to one another in the sheet pile punch arrangement direction I intermesh with each other A steel sheet pile joint fixing bracket that is attached to the joint part of the steel sheet pile, the metal fitting body having a hollow portion that encloses the upper end of the joint part, and the metal fitting body being screwed together , and the joints are mutually connected. meshed from both sides of the joint portion formed by the steel sheet piles, characterized by comprising a plurality of fastening bolts for clamping joint fixing bracket. Fitting each other respectively provided at an end portion of the rising portion forming the opposite ends of the sheet pile striking arrangement direction of the steel sheet pile body, disposed adjacent to each other bite each other in the sheet pile droplet alignment direction from each other and adjacent sheet piles A steel sheet pile joint fixing bracket that is attached to a joint portion between each steel sheet pile installed with a step at the upper end of the joint, and both sides of the rising portion extending from each joint of the joint portion and the joint portion A pair of sandwiching plates each having a shape including the joint portion and the rising portion, a side portion of one rising portion that is screwed to the sandwiching plate and extends from each joint of the joint portion, and the other A steel sheet pile joint fixing bracket, comprising a plurality of fastening bolts for clamping the upper end of the rising part from both sides . 3. A steel sheet pile joint fixing bracket according to claim 1, wherein the plurality of fastening bolts are screwed symmetrically .   The steel sheet pile joint fixing bracket according to any one of claims 1 to 3, wherein a plurality of fastening bolts are screwed together at intervals in the sheet pile axial direction. Part fixing bracket.

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