JP2007040053A - Construction method of steel pipe sheet pile structure and the steel pipe sheet pile structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method of a steel pipe sheet pile structure capable of rapidly improving strength and rigidity by fixing a distance between both steel pipes to raise the constrained effect by mortar inside of a joint and the steel pipe sheet pile structure. <P>SOLUTION: The steel pipe 2 is composed of a steel pipe body 3, a female joint 5 and a male joint 7 formed by fixing each of a pair of angle steels to the steel pipe body 3 in parallel with the axial direction. A hole 55 is bored in an outer claw 15 of the female joint 5. A spacer 11 is fixed to an inner claw 19 of the male joint 7. When the female joint 5 is fitted to the male joint 7, the spacer 11 is made to come into contact with the circumferential surface 4 of the steel pipe body 3 fixing the female joint 5 thereto to force widen an interval between both steel pipe bodies 3 of the adjoining steel pipes 2 to adhere the outer claw 15 to the inner claw 19 by moving earth and sand between the outer claw 15 and the inner claw 19 to the outside through the hole 55 by the pressure, and an interval between the adjoining steel pipe bodies 3 is fixed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for constructing a steel pipe sheet pile structure and a steel pipe sheet pile structure.

  Conventionally, when a steel pipe sheet pile is connected by a joint member to form a well and a bridge foundation structure, seawall or breakwater structure is constructed, horizontal forces such as seismic force and wave force are applied to the structure. The joint generates a shearing force, that is, a force that causes the joint to shift from each other in the axial direction of the steel pipe. When the joint is deformed by the shearing force, the entire structure is deformed in the horizontal direction, so that the joint is required to have high strength and rigidity.

  As measures for increasing the horizontal rigidity of the entire foundation, it is conceivable to improve the shear strength of the joint part and increase the number of steel pipe sheet piles. However, when increasing the horizontal rigidity of the entire foundation in large-scale bridge foundations where a large external force is applied, etc., it is uneconomical to increase the number of steel pipe sheet piles. It becomes a basic. Therefore, in order to increase the bending rigidity within a range where the scale of the foundation does not become excessive, it is necessary to use a joint having a large shear strength.

  As a joint structure, a pipe-shaped joint member in which a longitudinal slit is formed is welded to a steel pipe sheet pile made of a steel pipe of a predetermined diameter along the steel pipe axial direction, and the joint members are engaged with each other through this slit and are adjacent to each other. There was a PP joint that connects steel pipe sheet piles. In recent years, in order to increase the strength and rigidity of these joints, a method has been proposed in which a protrusion is provided inside a pipe-shaped joint member of a PP joint on a steel pipe (see, for example, Patent Document 1).

JP 2000-355931 A

  Moreover, there existed the LL type | mold joint which connects adjacent steel pipe sheet piles by welding an angle steel to the outer periphery of a steel pipe, and engaging an angle steel in the shape of a nail | claw. As for the LL type joint, in order to increase the strength and rigidity of the joint, there has been proposed a method of installing a rod-shaped steel material with a protrusion on the outer periphery of the steel pipe in the joint.

  FIG. 9 shows a plan view of a steel pipe sheet pile structure 101 using LL type joints. As shown in FIG. 9, the steel pipe sheet pile structure 101 connects the adjacent steel pipe main bodies 103 by engaging the outer claws 115 of the female joint 105 and the inner claws 117 of the male joint 107 to form the joint 106. In addition, the internal space 111 of the joint 106 is filled with a filler such as mortar (not shown). In the internal space 111 of the joint 106, a rod-shaped steel material such as a deformed reinforcing bar 109 is fixed to the outer peripheral surface of the steel pipe main body 103.

  Shear force acting on the female joint 105 and the male joint 107 is transmitted to the adjacent steel pipe body 103 via a filler such as mortar (not shown). The shear force transmission mechanism includes (1) adhesion between the surface of the steel pipe main body 103 and the deformed reinforcing bar 109 and the mortar, (2) mechanical engagement between the irregularities and the mortar due to the deformation of the deformed reinforcing bar 109, and (3) the steel pipe main body 103 and It consists of three elements: friction between the surface of the deformed reinforcing bar 109 and a filler such as mortar.

  However, the adhesion of (1) can hardly be expected. This is because the adhesive strength between mortar and steel is inherently very weak, and adhesion is easily lost due to shrinkage of mortar, expansion or contraction due to temperature difference between mortar and steel, vibration during construction, and microearthquakes. This is because once adhesion is lost, it does not adhere again.

  The mechanical meshing of (2) can be expected only when the shift amount of the female joint 105 and the male joint 107 is about 0 to several mm. This is because the size of the irregularities of the bottom of the deformed reinforcing bar 109 is at most several millimeters depending on the diameter of the reinforcing bar. When a displacement exceeding this is generated, the mortar is cracked and crushed in a complicated manner, and the reinforcing bar is restrained. Because it is lost. However, this mechanical meshing greatly affects the initial rigidity of the joint 106.

  The friction (3) plays the most important role in the structure of the joint 106. When the deformed reinforcing bar 109 and the mortar are displaced from each other, the mortar tends to slip along the shape of the deformed reinforcing bar 109, so that the mortar and the deformed reinforcing bar 109 try to leave. Further, in the process where the mortar is cracked and crushed, a granular material such as mortar or sand undergoes a volume change (so-called dilatancy phenomenon) due to shear deformation, so that the volume tends to increase.

  The cross section inside the joint 106 is restrained sufficiently long in the axial direction of the steel pipe body 103 against the displacement of the joint 106. Further, the outer claw 115 and the inner claw 117 are constrained in the direction indicated by the arrow A in the planar direction of the joint 106. However, although the outer claw 115 and the inner claw 117 are engaged with each other in the direction indicated by the arrow B, that is, the direction in which the steel pipe main body 103 is about to be separated, there is actually a gap 113 for absorbing construction errors. There is earth and sand in the gap 113.

  When the female joint 105 and the male joint 107 are about to be displaced, a force acts to cause the adjacent steel pipe main bodies 103 to separate from each other. If this force can be constrained by the rigidity of the steel pipe main body 103 itself, that is, the resistance when the circular cross section of the steel pipe main body 103 is crushed into an ellipse, the contact pressure between the surface of the steel pipe main body 103 and the deformed reinforcing bar 109 and the mortar. Therefore, a frictional force is generated at the time of deviation, and an action of preventing the female joint 105 and the male joint 107 from shifting is produced. However, the cross section of the steel pipe main body 103 has almost no such resistance and easily deforms.

  From the above, the structure of the joint 106 shown in FIG. 9 has practically sufficient shear rigidity / strength with a relative displacement amount of only several millimeters. Therefore, when positive and negative forces are repeatedly applied as in an earthquake, there is a problem that the rigidity and strength are significantly deteriorated as compared with a healthy case.

  The present invention has been made in view of such problems, and the object of the present invention is to dramatically increase the strength and rigidity by fixing the distance between the steel pipes and enhancing the restraining effect of the mortar inside the joint. It is providing the construction method of the steel pipe sheet pile structure which improves, and a steel pipe sheet pile structure.

  A first invention for achieving the above-mentioned object is a first steel pipe main body and a first joint formed by fixing a steel material along the axial direction to the first steel pipe main body. A second steel pipe comprising a second steel pipe, a second steel pipe main body, and a second joint formed by fixing a steel material along the axial direction to the second steel pipe main body. The first joint and the second joint are fitted while fixing the installation interval between the first steel pipe and the second steel pipe using a spacing member installed between the first steel pipe and the second steel pipe. It is the construction method of the steel pipe sheet pile structure characterized by connecting together.

  One of the first joint and the second joint is a female joint and the other is a male joint. The first joint has, for example, a first claw portion provided continuously with a leg portion fixed to the first steel pipe main body, and the second joint is fixed to the second steel pipe main body, for example. It shall have the 2nd nail | claw part provided continuously by the made leg part. Each of the first joint and the second joint is made of, for example, a pair of angle steels, and two sides of the angle steel function as leg portions and claw portions. The leg portion is fixed to the steel pipe body, and the claw portion is used as a pull-out preventing member when fitting the joints.

  The spacing member includes, for example, a groove-shaped main body and a fixing member provided continuously to the main body. The cross section of the main body is rectangular, arcuate or the like. The fixing member is provided on both sides or one side of the groove-shaped main body.

  In this case, when the fixing member for the spacing member is fixed to either the first claw portion or the second steel pipe main body in advance and the first joint and the second joint are fitted together. The main body of the spacing member is brought into contact with the other of the first claw portion and the second steel pipe main body.

  Alternatively, when the fixing member for the spacing member is fixed in advance to either the first steel pipe main body or the second steel pipe main body, and the first joint and the second joint are fitted, The main body of the spacing member is brought into contact with the other of the first steel pipe main body and the second steel pipe main body.

  The spacing member may be made of a disc-shaped main body and a fixing member pin-coupled to the main body.

  In this case as well, when the fixing member for the spacing member is fixed in advance to either the first claw portion or the second steel pipe body, the first joint and the second joint are fitted together. Then, the main body of the spacing member is brought into contact with the other of the first claw portion and the second steel pipe main body.

  Alternatively, when the fixing member for the spacing member is fixed in advance to either the first steel pipe main body or the second steel pipe main body, and the first joint and the second joint are fitted, The main body of the spacing member is brought into contact with the other of the first steel pipe main body and the second steel pipe main body.

  A tube that expands only in the cross-sectional direction may be used as the spacing member. The tube is made of a material that can withstand expansion pressure, such as rubber. In this case, the tube is fixed in advance to one of the first claw portion and the second steel pipe main body, and after fitting the first joint and the second joint, the tube is expanded to expand the first. One claw part is brought into contact with the other of the second steel pipe main body.

  Regardless of which type of spacing member is used, the claw portion of the first joint and / or the second claw portion is provided with a hole for discharging earth and sand as necessary. The first claw portion and the second claw portion may be brought into close contact with each other by discharging the earth and sand from this hole by the contact pressure between the spacing member and the first steel pipe and the second steel pipe.

  2nd invention is the steel pipe sheet pile structure characterized by being constructed | assembled using the construction method of the steel pipe sheet pile structure of 1st invention.

  ADVANTAGE OF THE INVENTION According to this invention, the construction method of a steel pipe sheet pile structure and a steel pipe sheet pile structure which improve the intensity | strength and rigidity dramatically by fixing the distance of steel pipes and heightening the restraint effect by the mortar inside a joint can be provided. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a plan view of a steel pipe sheet pile structure 1. As shown in FIG. 1, the steel pipe sheet pile structure 1 includes a plurality of steel pipes 2. The steel pipe 2 includes a steel pipe main body 3, a female joint 5, a male joint 7, a rod-shaped steel material 9, a spacer 11, and the like. The female joint 5 and the male joint 7 are fixed to the outer peripheral surface 4 of the steel pipe main body 3 at a predetermined interval in the circumferential direction.

  In the steel pipe sheet pile structure 1, in order to connect adjacent steel pipes 2, the female joint 5 and the male joint 7 are combined to form the joint 6. Further, the inner space 25 of the joint 6 is filled with a filler (not shown) such as mortar. The detail of the connection method of the steel pipe 2 is mentioned later.

  FIG. 2 is a perspective view of the vicinity of the joint 6 of the steel pipe 2. FIG. 2 is a perspective view of the steel pipe 2 on the female joint 5 side cut along a horizontal plane at a position lower than the upper end position of the steel pipe 2 on the male joint 7 side. FIG. 3 is a plan view of the vicinity of the joint 6 of the steel pipe 2.

  As shown in FIGS. 1 to 3, the steel pipe body 3 is a cylindrical steel pipe. The female joint 5 is composed of a pair of angle steels. The angle steel consists of a leg portion 13 and an outer claw 15. The angled steel legs 13 constituting the female joint 5 are fixed to the outer peripheral surface 4 of the steel pipe body 3. At this time, the pair of angled steel leg portions 13 are arranged along the axial direction of the steel pipe body 3 at a predetermined interval in the circumferential direction of the steel pipe body 3. The pair of angle steel outer claws 15 are arranged inward so as to approach each other. A hole 55 is provided in the outer claw 15.

  The male joint 7 is composed of a pair of angle steels. The angle steel consists of a leg portion 17 and an inner claw 19. The angled steel legs 17 constituting the male joint 7 are fixed to the outer peripheral surface 4 of the steel pipe body 3. At this time, the pair of angled steel leg portions 17 are arranged along the axial direction of the steel pipe body 3 at a predetermined interval in the circumferential direction of the steel pipe body 3. Further, the pair of angle iron inner claws 19 are arranged outward so as to be separated from each other.

  The installation interval between the leg 13 of the female joint 5 and the leg 17 of the male joint 7 is set so that the female joint 5 and the male joint 7 can be fitted. That is, the pair of leg portions 13 of the female joint 5 are arranged at a distance larger than the distance between both ends of the pair of inner claws 19 of the male joint 7. Further, the pair of leg portions 17 of the male joint 7 are arranged at a distance smaller than the distance between both ends of the pair of outer claws 15 of the female joint 5.

  The rod-shaped steel material 9 is fixed to the outer peripheral surface 4 of the steel pipe main body 3 along the axial direction. For the rod-shaped steel material 9, for example, a deformed reinforcing bar is used. The rod-shaped steel material 9 is disposed on a portion between the pair of legs 13 of the female joint 5 and a portion between the pair of legs 17 of the male joint 7 on the outer peripheral surface 4 of the steel pipe body 3. A plurality of rod-shaped steel materials 9 are arranged at a predetermined interval in the circumferential direction of the steel pipe body 3.

  The spacer 11 is a spacing member and is provided on the inner claw 19 of the male joint 7. The spacer 11 includes a groove-shaped main body 21 having a trapezoidal cross section, and fixing members 23 provided on both sides of the groove-shaped main body 21. The fixing member 23 is fixed to the surface 20 of the inner claw 19 of the male joint 7 not facing the outer claw 15 of the female joint 5 by welding or the like. For example, the spacer 11 is disposed so that the groove axis direction of the groove-shaped main body 21 is horizontal.

  In order to connect the steel pipes 2, first, as shown in FIG. 2, the steel pipes 2 are fixed to other adjacent steel pipe main bodies 3 between a pair of outer claws 15 of the female joint 5 fixed to the steel pipe main body 3. A pair of leg portions 17 of the male joint 7 is inserted. Thereby, the female joint 5 and the male joint 7 are fitted, and the joint 6 is formed. The outer claws 15 of the female joint 5 and the inner claws 19 of the male joint 7 are used as members for preventing the male joint 7 from coming out of the female joint 5.

  When the female joint 5 and the male joint 7 are fitted, as shown in FIG. 3, the main body 21 of the spacer 11 fixed to the inner claw 19 of the male joint 7 is replaced with the steel pipe main body 3 to which the female joint 5 is fixed. By contacting the outer peripheral surface 4, the space | interval of the steel pipe main bodies 3 of the adjacent steel pipe 2 is expanded, and the outer nail | claw 15 and the inner nail | claw 19 closely_contact | adhere. The earth and sand between the outer claw 15 and the inner claw 19 is discharged from a hole 55 provided in the outer claw 15. After forming the joint 6, the inner space 25 of the joint 6 is filled with mortar (not shown).

  Thus, in the first embodiment, by installing the spacer 11 between the surface 20 of the inner claw 19 of the male joint 7 and the outer peripheral surface 4 of the steel pipe body 3 to which the female joint 5 is fixed, When the steel pipes 2 are connected to each other, the interval between the adjacent steel pipe main bodies 3 can be fixed in a state where the outer claws 15 and the inner claws 19 are in close contact with each other. The spacer 11 is also used as a steering plate at the tip of the steel pipe 2.

  By bringing the outer claw 15 and the inner claw 19 into close contact with each other, the displacement rigidity of the joint 6 is increased, and effects such as an improvement in shear rigidity in the out-of-plane direction, water stoppage, and improvement in construction accuracy can be obtained.

In the first embodiment, the earth and sand filled in the gap between the outer claw 15 and the inner claw 19 is discharged from the hole 55 provided in the outer claw 15, but the hole 55 is used as necessary. Provided. Since the earth and sand is easily compacted when subjected to a pressure of several kgf / mm ² , the earth and sand between the outer claws 15 and the inner claws 19 are compacted by the pressure when the spacer 11 spreads the distance between the steel pipe main bodies 3, Even when left without discharging, the same effect as when the outer claw 15 and the inner claw 19 are brought into close contact with each other can be obtained.

  The shape of the spacer is not limited to that shown in FIGS. FIG. 4 is a diagram showing a spacer having another shape. FIG. 4A is a perspective view of the male joint 7 to which the spacer 27 is fixed. The spacer 27 is a spacing member, and includes a groove-shaped main body 29 having a trapezoidal cross section and a fixing member 31 provided on one side of the groove-shaped main body 29. The fixing member 31 is fixed to the surface 20 of the inner claw 19 of the male joint 7 not facing the outer claw 15 of the female joint 5 by welding or the like. The spacer 27 is disposed so that the groove axis of the groove-shaped main body 29 is horizontal, for example.

  The direction in which the spacer 27 is fixed to the steel pipe main body 3 is preferably the direction in which the main body 29 rubs by the placement of the joint 6 from the fixing member 31 toward the other non-fixed end. In FIG. 4A, the spacer 27 is arranged on the inner claw 19 of the male joint 7 so that the fixing member 31 is on the upper side. In this case, the steel pipe 2 on the male joint 7 side is preceded. Then, the steel pipe 2 on the female joint 5 side may be driven.

  FIG. 4B is a perspective view of the male joint 7 to which the spacer 39 is fixed. The spacer 39 is a spacing member, and includes a groove-shaped main body 41 having an arcuate cross section and fixing members 43 provided on both sides of the groove-shaped main body 41. The fixing member 43 is fixed to the surface 20 of the inner claw 19 of the male joint 7 not facing the outer claw 15 of the female joint 5 by welding or the like. The spacer 39 is disposed, for example, so that the groove axis of the groove-shaped main body 41 is horizontal.

  FIG. 4C is a perspective view of the male joint 7 to which the spacer 47 is fixed. The spacer 47 is a spacing member, and includes a disk-shaped main body 47 and fixing members 49 provided on both sides of the main body 47. The main body 47 is connected to the fixing member 49 by a pin 51. The fixing member 49 is fixed to the surface 20 of the inner claw 19 of the male joint 7 not facing the outer claw 15 of the female joint 5 by welding or the like. The spacer 47 is disposed so that the rotation axis of the main body 47 is horizontal.

  Even when various spacers as shown in FIG. 4 are used, when the female joint 5 and the male joint 7 are fitted together, as in the case of using the spacer 11 shown in FIGS. The space | interval of the adjacent steel pipe main body 3 can be fixed in the state which expanded the space | interval of mutual and the outer nail | claw 15 and the inner nail | claw 19 were closely_contact | adhered.

  Further, in FIGS. 1 to 4, the spacer is fixed to the surface 20 of the inner claw 19 of the male joint 7, but the spacer may be fixed to the outer peripheral surface 4 of the steel pipe body 3 to which the female joint 5 is fixed. In this case, when fitting the female joint 5 of the steel pipe 2 and the male joint 7 of the other steel pipe 2 adjacent to each other, the spacer fixed to the outer peripheral surface 4 of the steel pipe body 3 to which the female joint 5 is fixed is By contacting the surface 20 of the inner claw 19 of the male joint 7, the distance between the steel pipe main bodies 3 is expanded and the outer claw 15 and the inner claw 19 are brought into close contact with each other.

  Next, a second embodiment will be described. FIG. 5 shows a perspective view of the vicinity of the joint 6a of the steel pipe 2a. FIG. 5 is a cross-sectional view in a state where the steel pipe 2a on the male joint 7 side is cut by a horizontal plane at a position lower than the upper end position of the steel pipe 2a on the female joint 5 side. FIG. 6 is a plan view of the vicinity of the joint 6a of the steel pipe 2a.

  The steel pipe 2a used in the second embodiment has substantially the same configuration as that of the steel pipe 2 used in the first embodiment. However, in the steel pipe 2a, as shown in FIGS. The spacer 11 is not installed on the inner claw 19, and the spacer 11 a is installed on the outer claw 15 of the female joint 5.

  Like the spacer 11, the spacer 11 a is a spacing member and includes a groove-shaped main body 21 having a trapezoidal cross section and fixing members 23 provided on both sides of the groove-shaped main body 21. The fixing member 23 is fixed to the surface 16 of the outer claw 15 of the female joint 5 not facing the inner claw 19 of the male joint 7 by welding or the like. For example, the spacer 11a is arranged so that the groove axis direction of the groove-shaped main body 21 is horizontal.

  In order to connect the steel pipes 2a, first, as shown in FIG. 5, between the pair of outer claws 15 of the female joint 5 fixed to the steel pipe main body 3, it is fixed to another adjacent steel pipe main body 3. A pair of leg portions 17 of the male joint 7 is inserted. Thereby, the female joint 5 and the male joint 7 are fitted, and the joint 6a is formed. The outer claws 15 of the female joint 5 and the inner claws 19 of the male joint 7 are used as members for preventing the male joint 7 from coming out of the female joint 5.

  When the female joint 5 and the male joint 7 are fitted, as shown in FIG. 6, the main body 21 of the spacer 11a fixed to the outer claw 15 of the female joint 5 is replaced with the steel pipe main body 3 to which the male joint 7 is fixed. By contacting the outer peripheral surface 4, the space | interval of the steel pipe main bodies 3 of the adjacent steel pipe 2a is expanded, and the outer nail | claw 15 and the inner nail | claw 19 closely_contact | adhere. The earth and sand between the outer claw 15 and the inner claw 19 is discharged from a hole 55 provided in the outer claw 15. After forming the joint 6a, the inner space 25 of the joint 6a is filled with mortar (not shown).

  Thus, in 2nd Embodiment, by installing the spacer 11a between the surface 16 of the outer nail | claw 15 of the female joint 5, and the outer peripheral surface 4 of the steel pipe main body 3 to which the male joint 7 was fixed, When the steel pipes 2a are connected to each other, the interval between the adjacent steel pipe main bodies 3 can be fixed in a state where the outer claws 15 and the inner claws 19 are in close contact with each other. The spacer 11a is also used as a steering plate at the tip of the steel pipe 2a.

  By bringing the outer claw 15 and the inner claw 19 into close contact with each other, the displacement rigidity is increased in the joint 6a, and effects such as improvement of shear rigidity in the out-of-plane direction, water stoppage, and improvement in construction accuracy can be obtained.

In the second embodiment as well, the earth and sand filled in the gap between the outer claw 15 and the inner claw 19 is discharged from the hole 55 provided in the outer claw 15, but the hole 55 is used as necessary. Provided. Since the earth and sand are easily compacted when subjected to a pressure of several kgf / mm ² , the earth and sand between the outer claws 15 and the inner claws 19 are compacted by the pressure when the spacer 11a pushes the gap between the steel pipe main bodies 3; Even when left without discharging, the same effect as when the outer claw 15 and the inner claw 19 are brought into close contact with each other can be obtained.

  Also in the second embodiment, the shape of the spacer is not limited to that shown in FIGS. Even when a spacer having another shape as shown in FIG. 4 is used, when the female joint 5 and the male joint 7 are fitted together, as in the case of using the spacer 11a shown in FIGS. The space | interval of the adjacent steel pipe main bodies 3 can be fixed in the state which pushed and expanded the space | interval of 3 and the outer nail | claw 15 and the inner claw 19 were stuck.

  5 and 6, the spacer is fixed to the surface 16 of the outer claw 15 of the female joint 5, but the spacer may be fixed to the outer peripheral surface 4 of the steel pipe body 3 to which the male joint 7 is fixed. In this case, when fitting the female joint 5 of the steel pipe 2 and the male joint 7 of another adjacent steel pipe 2, the spacer fixed to the outer peripheral surface 4 of the steel pipe main body 3 to which the male joint 7 is fixed, By contacting the surface 16 of the outer claw 15 of the female joint 5, the interval between the steel pipe main bodies 3 is expanded and the outer claw 15 and the inner claw 19 are brought into close contact with each other.

  Next, a third embodiment will be described. FIG. 7 is a plan view of the vicinity of the joint 6b of the steel pipe 2b.

  The steel pipe 2b used in the third embodiment has substantially the same configuration as the steel pipe 2 used in the first embodiment. However, as shown in FIG. 7, in the steel pipe 2b, the inner claws 19 of the male joint 7 are used. A hose 53 is installed on the surface 20 instead of the spacer 11. The hose 53 is a spacing member and is a tube that expands only in the cross-sectional direction. The hose 53 is made of a material that can withstand expansion pressure, such as rubber.

  In order to connect the steel pipes 2b, first, a pair of male joints 7 fixed to another adjacent steel pipe main body 3 between a pair of outer claws 15 of the female joint 5 fixed to the steel pipe main body 3. The leg portion 17 is inserted. Thereby, the female joint 5 and the male joint 7 are fitted, and the joint 6b is formed. The outer claws 15 of the female joint 5 and the inner claws 19 of the male joint 7 are used as members for preventing the male joint 7 from coming out of the female joint 5.

  After fitting the female joint 5 and the male joint 7, as shown in FIG. 7, the inside of the hose 53 fixed to the inner claw 19 of the male joint 7 is filled with fluid to expand the hose 53, and the hose 53 is brought into contact with the outer peripheral surface 4 of the steel pipe body 3 to which the female joint 5 is fixed. Thereby, the space | interval of the steel pipe main bodies 3 is pushed wide, and the outer nail | claw 15 of the female joint 5 and the inner claw 19 of the male joint 7 contact | adhere. The earth and sand filled in the gap between the outer claw 15 and the inner claw 19 is discharged from the hole 55 provided in the outer claw 15. After the outer claws 15 of the female joint 5 and the inner claws 19 of the male joint 7 are brought into close contact with each other, the inner space 25 of the joint 6b is filled with mortar (not shown).

  The fluid filled in the hose 53 may be any material as long as it can maintain the expansion pressure until the inner space 25 of the joint 6b is filled with mortar or the like and is cured. If the fluid filled in the hose 53 is mortar, cement paste, curable resin, etc., the expansion pressure may be maintained until it is cured, and the construction of the inner space 25 of the joint 6b thereafter is performed. Easy.

  Generally, when the female joint 5 and the male joint 7 are fitted, a gap of about 30 mm (gap 113 shown in FIG. 9) is generated between the outer claw 15 and the inner claw 19 of the male joint 7. . Then, the force for sticking the outer nail | claw 15 and the inner nail | claw 19 by enlarging the space | interval of the steel pipe main bodies 3 30mm is shown below.

Radius R = 0.75 m, thickness t = a 1m Atari than ^{0.017m I = 1 × 0.017 3 /} 12m 4 steel pipe body 3 of the steel pipe body 3, when the elastic modulus E = 200 × 106kN / ^{m 2} The change in diameter due to the concentrated load is ΔDy = −0.149PR ³ /EI=−0.7677 mm / kN. That is, the distance between the steel pipe main bodies 3 is increased by 0.7677 mm with a force of 1 kN (= 100 kgf) per meter. In order to expand 30 mm, a force of 39 kN / m = 3.9 tf / m is required.

If two hoses 53 having a diameter of 40 mm are arranged, the required pressure is 39 kN (2 × 40 mm × 1000 mm) = 0.488 N / mm ² = about 5 kgf / mm ² . This is a sufficiently realistic value. Moreover, since the yield load of the steel pipe main body 3 is 47.45 kN / m, the steel pipe main body 3 does not yield with respect to the above 39 kN / m, and the direction differs from the bending stress of the steel pipe main body 3 due to the earthquake. There is no adverse effect on the steel pipe body 3 itself.

  Thus, in 3rd Embodiment, by installing the hose 53 between the surface 20 of the inner nail | claw 19 of the male joint 7, and the outer peripheral surface 4 of the steel pipe main body 3 to which the male joint 7 was fixed, When the steel pipes 2b are connected to each other, the interval between the adjacent steel pipe main bodies 3 can be fixed in a state where the outer claws 15 and the inner claws 19 are in close contact with each other. Further, the hose 53 can also serve as a water stop member of the joint 6b.

  By bringing the outer claw 15 and the inner claw 19 into close contact with each other, the displacement rigidity is increased in the joint 6b, and effects such as improvement of shear rigidity in the out-of-plane direction, water stoppage, and improvement in construction accuracy can be obtained.

Also in the third embodiment, the earth and sand filled in the gap between the outer claw 15 and the inner claw 19 is discharged from the hole 55 provided in the outer claw 15, but the hole 55 is used as necessary. Provided. Since the earth and sand are easily compacted when subjected to a pressure of several kgf / mm ² , the earth and sand between the outer claws 15 and the inner claws 19 are compacted by the pressure when the hose 53 expands the distance between the steel pipe main bodies 3, Even when left without discharging, the same effect as when the outer claw 15 and the inner claw 19 are brought into close contact with each other can be obtained.

  Further, in FIG. 7, the hose 53 is fixed to the surface 20 of the inner claw 19 of the male joint 7, but the choke 53 may be fixed to the outer peripheral surface 4 of the steel pipe body 3 to which the female joint 5 is fixed. In this case, after fitting the female joint 5 of the steel pipe 2 and the male joint 7 of another adjacent steel pipe 2, the hose 53 fixed to the outer peripheral surface 4 of the steel pipe body 3 to which the female joint 5 is fixed is provided. By inflating, the hose 53 is brought into contact with the surface 20 of the inner claw 19 of the male joint 7, and the outer claw 15 of the female joint 5 and the inner claw 19 of the male joint 7 are brought into close contact with each other.

  Next, a fourth embodiment will be described. FIG. 8 is a plan view of the vicinity of the joint 6c of the steel pipe 2c.

  The steel pipe 2c used in the fourth embodiment has substantially the same configuration as the steel pipe 2 used in the first embodiment. However, as shown in FIG. 8, in the steel pipe 2c, the inner claw 19 of the male joint 7 is used. The spacer 11b is not installed on the outer peripheral surface 4 of the steel pipe body 3 to which the female joint 5 is fixed.

  Like the spacer 11, the spacer 11 b is a spacing member and includes a groove-shaped main body 21 having a trapezoidal cross section and fixing members 23 provided on both sides of the groove-shaped main body 21. The fixing member 23 is fixed to a portion of the outer peripheral surface 4 of the steel pipe main body 3 between the pair of angle steel legs 5 forming the female joint 5 by welding or the like. For example, the spacer 11b is arranged so that the groove axis direction of the groove-shaped main body 21 is horizontal.

  In order to connect the steel pipes 2c to each other, first, a pair of male joints 7 fixed to another adjacent steel pipe main body 3 between a pair of outer claws 15 of the female joint 5 fixed to the steel pipe main body 3. The leg portion 17 is inserted. Thereby, the female joint 5 and the male joint 7 are fitted, and the joint 6c is formed. The outer claws 15 of the female joint 5 and the inner claws 19 of the male joint 7 are used as members for preventing the male joint 7 from coming out of the female joint 5.

  When the female joint 5 and the male joint 7 are fitted, as shown in FIG. 8, the main body 21 of the spacer 11b fixed to the outer peripheral surface 4 of the steel pipe main body 3 to which the female joint 5 is fixed is By contacting the outer peripheral surface 4 of the fixed steel pipe main body 3, the space | interval of the steel pipe main bodies 3 of the adjacent steel pipe 2c is expanded, and the outer nail | claw 15 and the inner nail | claw 19 closely_contact | adhere. The earth and sand between the outer claw 15 and the inner claw 19 is discharged from a hole 55 provided in the outer claw 15. After forming the joint 6c, the inner space 25 of the joint 6c is filled with mortar (not shown).

  Thus, in 4th Embodiment, the spacer 11b is installed between the outer peripheral surface 4 of the steel pipe main body 3 to which the female joint 5 was fixed, and the outer peripheral surface 4 of the steel pipe main body 3 to which the male joint 7 was fixed. Thus, when the steel pipes 2c are connected to each other, the interval between the adjacent steel pipe main bodies 3 can be fixed in a state where the outer claws 15 and the inner claws 19 are in close contact with each other. The spacer 11b is also used as a steering plate at the tip of the steel pipe 2c.

  By bringing the outer claw 15 and the inner claw 19 into close contact with each other, the displacement rigidity is increased in the joint 6c, and effects such as improvement of shear rigidity in the out-of-plane direction, water stoppage, and improvement in construction accuracy can be obtained.

Also in the fourth embodiment, the earth and sand filled in the gap between the outer claw 15 and the inner claw 19 is discharged from the hole 55 provided in the outer claw 15, but the hole 55 is used as necessary. Provided. Since the earth and sand are easily compacted when subjected to a pressure of several kgf / mm ² , the earth and sand between the outer claws 15 and the inner claws 19 are compacted by the pressure when the spacer 11b expands the distance between the steel pipe main bodies 3, Even when left without discharging, the same effect as when the outer claw 15 and the inner claw 19 are brought into close contact with each other can be obtained.

  Further, the shape of the spacer is not limited to that shown in FIG. Even when a spacer having another shape as shown in FIG. 4 is used, when the female joint 5 and the male joint 7 are fitted together, as in the case of using the spacer 11b shown in FIG. The distance between adjacent steel pipe main bodies 3 can be fixed in a state where the distance is widened and the outer claws 15 and the inner claws 19 are brought into close contact with each other.

  Further, in FIG. 8, the spacer is fixed to the outer peripheral surface 4 of the steel pipe main body 3 to which the female joint 5 is fixed. However, the spacer may be fixed to the outer peripheral surface 4 of the steel pipe main body 3 to which the male joint 7 is fixed. In this case, when the female joint 5 of the steel pipe 2c and the male joint 7 of another adjacent steel pipe 2c are fitted together, the spacer fixed to the outer peripheral surface 4 of the steel pipe body 3 to which the male joint 7 is fixed, By contacting the outer peripheral surface 4 of the steel pipe main body 3 to which the female joint 5 is fixed, the interval between the steel pipe main bodies 3 is expanded and the outer claws 15 and the inner claws 19 are brought into close contact with each other.

  In the first, second, and fourth embodiments, when a spacer having a groove-shaped main body is used, a filler having an expandability before fitting the female joint 5 and the male joint 7 inside the main body ( You may fill with expansion mortar etc.). When an expansion mortar or the like is used, a force for expanding the interval between the steel pipe main bodies 3 can be increased by the expansion pressure.

  In the first to fourth embodiments, the circular cross section of the steel pipe body 3 is forcibly deformed into an elliptical shape, and after the female joint 5 and the male joint 7 are fitted together, the elastic deformation of the steel pipe body 3 is performed. By returning, the steel pipe body 3 and the spacer may be brought into close contact with each other.

  As mentioned above, although preferred embodiment of the steel pipe sheet pile structure concerning this invention was described referring an accompanying drawing, this invention is not limited to this example. 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.

  3, 5, 6, 7, and 8, the hole 55 for discharging earth and sand is provided in the outer claw 15, but the hole may be provided in the inner claw 19. In this case, the earth and sand are discharged into the internal space 25 of the joint 6 through the holes. Further, holes may be provided in both the outer claw 15 and the inner claw 19.

  The number of spacers installed is not limited. In the drawings shown in the first to fourth embodiments, the installation heights of the left and right nail spacers are the same, but they may be alternately arranged in a zigzag manner on the left and right nails. By installing the spacers in a staggered manner, the degree of freedom when building the steel pipe 2 is increased.

  In the first to fourth embodiments, the female joint 5 and the male joint 7 have been described using (LL) × 2 type joints, each of which is composed of a pair of angle steels. It can also be applied to mold joints, CT joints, and (LT) × 2 joints.

Plan view of steel pipe sheet pile structure 1 Perspective view of the vicinity of the joint 6 of the steel pipe 2 Plan view of the vicinity of the joint 6 of the steel pipe 2 Diagram showing spacers with other shapes Perspective view of the vicinity of the joint 6a of the steel pipe 2a Plan view of the vicinity of the joint 6a of the steel pipe 2a Plan view of the vicinity of the joint 6b of the steel pipe 2b Plan view of the vicinity of the joint 6c of the steel pipe 2c Plan view of steel pipe sheet pile structure 101 using LL type joint

Explanation of symbols

1, 101 ... Steel pipe sheet pile structure 2, 2a, 2b, 2c ... Steel pipe 3 ... Steel pipe body 4 ... Outer peripheral surface 5 ... Female joint 6, 6a, 6b, 6c ... Joint 7 ......... Male joint 9 ......... Steel steel material 11, 11a, 11b, 27, 39, 45 ......... Spacer 13, 17 ......... Leg 15 ......... Outer claw 19 ......... Inner claw 21, 29 , 41, 47 ......... Main body 23, 31, 43, 49 ......... Fixing member 51 ......... Pin 53 ......... Hose 55 ......... Hole

Claims (7)

A first steel pipe comprising a first steel pipe main body and a first joint formed by fixing a steel material along the axial direction to the first steel pipe main body;
A second steel pipe comprising a second steel pipe main body and a second joint formed by fixing a steel material along the axial direction to the second steel pipe main body,
While fixing the installation interval between the first steel pipe and the second steel pipe using a spacing member installed between the first steel pipe and the second steel pipe, the first joint and the second steel pipe are fixed. The construction method of the steel pipe sheet pile structure characterized by fitting and connecting with the joint. The first joint has a first claw portion provided continuously to a leg portion fixed to the first steel pipe body;
The construction method for a steel pipe sheet pile structure according to claim 1, wherein the second joint has a second claw portion provided continuously to a leg portion fixed to the second steel pipe main body. . The spacing member comprises a groove-shaped main body and a fixing member provided continuously to the main body,
3. The fixing member is fixed to one of the first claw portion or the first steel pipe main body and the second steel pipe main body, and the main body is brought into contact with the other. The construction method of the steel pipe sheet pile structure of description. The spacing member comprises a disc-shaped main body and a fixing member pin-coupled to the main body,
3. The fixing member is fixed to one of the first claw portion or the first steel pipe main body and the second steel pipe main body, and the main body is brought into contact with the other. The construction method of the steel pipe sheet pile structure of description. The spacing member is a tube that expands only in the cross-sectional direction,
The construction of the steel pipe sheet pile structure according to claim 2, wherein the tube is fixed to one of the first claw part and the second steel pipe main body, and the tube is expanded and brought into contact with the other. Method. The first claw part or / and the second claw part has a hole for discharging earth and sand;
The steel pipe sheet pile structure according to any one of claims 3 to 5, wherein the first claw portion and the second claw portion are brought into close contact with each other by discharging earth and sand from the hole. Construction method.   A steel pipe sheet pile structure constructed using the construction method of a steel pipe sheet pile structure according to any one of claims 1 to 6.

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