Steel pipe sheet pile joint structure

Abstract

To provide a joint structure for a steel pipe sheet pile that can reliably maintain a fitting state of a joint even when eccentricity within a construction management standard for a steel pipe sheet pile occurs when driving a steel pipe sheet pile.SOLUTION: A joint structure 3 for a steel pipe sheet pile comprises: a fixed support part 9 in which a support body of a joint member 5 is fixed to an outer periphery of a steel pipe sheet pile 2; and a movable support part 10 which supports an engaging body 8 at one end. A plurality of elongated slide holes 14, 14 are formed in the movable support part with intervals in the vertical direction. A slide key 12 held by the fixed support part is inserted into the elongated slide hole 14. The fixed support part 9 and the movable support part 10 are connected via the slide key 12 so as to be movable in the tangential direction and the normal direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a joint structure of steel pipe sheet piles that connects adjacent steel pipe sheet piles. [Background technology]

[0002] Used for earth retaining walls and steel pipe sheet pile foundations Steel pipe sheet pile diaphragm wall Adjacent steel pipe sheet piles are connected via a joint structure.

[0003] The joint structure of this type of steel pipe sheet pile is such that a pair of joint members supported on the outer periphery of each adjacent steel pipe sheet pile engage with each other, and three types of joints, the so-called "LT type" joint, "PT type" joint, and "PP type" joint, are widely used as standards, and of these, the "PP type" joint is considered the standard joint for well steel pipe sheet pile foundations.

[0004] In a "PP type" joint, a joint steel pipe is fixed to the outer surface of each of the adjacent steel pipe sheet piles, and the two joint steel pipes are engaged with each other through slits formed in the joint steel pipes.

[0005] On the other hand, even with careful construction management, it is not easy to install steel pipe sheet piles at the ideal planar position and vertically into the ground as designed, and various management standards allow for a certain degree of eccentricity.

[0006] In the management of the installation of steel pipe sheet pile foundations connected by joint structures, generally, no control standard values ​​are specified for the inclination of the steel pipe sheet piles, and the eccentricity amount when viewed in a plane is specified to be within 300 mm (see, for example, non-patent document 2).

[0007] General control standards for the installation of prefabricated piles (steel pipe piles and concrete piles), which are stricter than the control standards for steel pipe sheet piles, stipulate that the amount of eccentricity when viewed in a plan view must be 1 / 4 of the pile diameter and 100 mm or less, and the pile inclination must be 1 / 100 or less (see, for example, non-patent document 1).

[0008] Here, with regard to the inclination of a pile, "a 1 / 100 inclination" means that for a pile 10m long, a maximum driving error of 100mm is allowed between the base and head of the pile, and the amount of eccentricity of the pile due to the inclination may vary in the depth direction.

[0009] On the other hand, in this type of joint structure, the dimensions of the joint members are standardized, and for example, an example of a "PP type" joint with dimensions as shown in the figure is known.

[0010] Therefore, when using this type of standardized joint structure, when driving a steel pipe sheet pile, the two joint members are constrained to an allowable amount of eccentricity that allows them to physically engage based on the standard dimensions.

[0011] In particular, PP-type fittings have a small clearance between the fitting steel pipes, making them difficult to engage under conditions where eccentricity such as that described above occurs. For example, compared to a fitting spacing of 247.8 mm in the standard engaged state, only an eccentricity ranging from +12.8 mm to -8.8 mm can be tolerated in tension and compression engaged states. [Prior art documents] [Patent documents]

[0012] [Non-Patent Document 1] Standardization of Steel Pipe Pile and Steel Pipe Sheet Pile Accessories (Revised 10th Edition), Steel Pipe Pile and Steel Pipe Sheet Pile Technology Association, May 2018 [Non-patent document 2] Civil Engineering Construction Management Standards and Standard Values ​​(Draft), Ministry of Land, Infrastructure, Transport and Tourism, March 2018 Summary of the Invention [Problem to be solved by the invention]

[0013] However, in the conventional joint structures described above, the dimensions of the joint members are standardized, and when using this type of standardized joint structure, when driving a steel pipe sheet pile, the two joint members are restricted to an allowable amount of eccentricity that allows them to physically engage based on the standard dimensions.

[0014] In particular, PP-type fittings have a small clearance between the fitting steel pipes, making them difficult to engage under conditions where eccentricity such as that described above occurs. For example, compared to a fitting spacing of 247.8 mm in the standard engaged state, only an eccentricity ranging from +12.8 mm to -8.8 mm can be tolerated in tension and compression engaged states.

[0015] In addition, the eccentricity of the steel pipe sheet pile due to the inclination may differ in the depth direction, and in the worst case scenario, the joint may come loose (disengage).

[0016] Therefore, conventional technology can only handle pile eccentricity that is below the construction management standard value, and the required construction accuracy for pile driving becomes more stringent, and this problem becomes more pronounced as the steel pipe sheet pile becomes longer.

[0017] Therefore, in consideration of these conventional problems, the present invention has been made with the aim of providing a joint structure for steel pipe sheet piles that can reliably maintain the engagement state of the joint even if eccentricity within the construction management standards for steel pipe sheet piles occurs during installation of the steel pipe sheet piles. [Means for solving the problem]

[0018] The feature of the invention described in claim 1 to solve the above-mentioned conventional problems is as follows: In a steel pipe sheet pile diaphragm wall consisting of multiple steel pipe sheet piles, A joint structure of a steel pipe sheet pile, which comprises a pair of joint members supported on the outer peripheries of adjacent steel pipe sheet piles, and the joint members are engaged with each other, wherein one or both of the joint members comprises a support member fixed to the outer periphery of the steel pipe sheet pile; The support The support body has a fixed support part fixed to the outer periphery of the steel pipe sheet pile and a movable support part having the engaging body supported at one end thereof, and a pair of connecting members are provided at intervals in the vertical direction on either the fixed support part or the movable support part. Tangential direction of steel pipe sheet pile diaphragm wall very long Multiple A slide slot is formed, and a plurality of slide keys are held at intervals in the vertical direction on either the fixed support part or the movable support part, and are inserted into the slide slot, and the fixed support part and the movable support part are connected via the slide keys. Tangential direction of steel pipe sheet pile diaphragm wall and perpendicular to the tangent direction of the steel pipe sheet pile continuous wall The difference is that they are connected so as to be movable in the normal direction.

[0019] The invention as set forth in claim 2 is characterized in that, in addition to the configuration of claim 1, the slide key is formed on the other of the fixed support part and the movable support part. Steel pipe sheet pile diaphragm wall The feature is that it is held in a state where it is inserted into a long slide hole that is long in the tangential direction.

[0020] The feature of the invention described in claim 3 is that, in addition to the configuration of claim 1 or 2, the fixed support part is composed of a pair of fixed support plates facing each other at a distance from each other, and the plate-shaped movable support part is inserted between the fixed support plates.

[0021] The feature of the invention described in claim 4 is that, in addition to the configuration of claim 1 or 2, the movable support part is composed of a pair of movable support plates facing each other at a distance from each other, and the plate-shaped fixed support part is inserted between the movable support plates.

[0022] The invention described in claim 5 is characterized in that, in addition to the configuration of claim 1 or 2, the fixed support part and the movable support part are formed by a pair of plate members arranged on top of each other.

[0023] The invention of claim 6 is characterized in that, in addition to the configuration of claim 5, the slide key has a retaining body at each end that is larger than the vertical width of the elongated sliding hole, and the slide key and the elongated sliding hole are connected together when the retaining body is engaged with the edge of the elongated sliding hole. Steel pipe sheet pile diaphragm wall The advantage is that the two components move relative to each other in the tangential direction.

[0024] The invention of claim 7 is characterized in that, in addition to the configuration of claim 5 or 6, the slide key comprises a cylindrical outer slide tube, an inner slide tube fitted with the outer slide tube so as to be slidable in the axial direction, and an elastic body that urges the inner and outer slide tubes in a direction of contraction relative to each other.

[0025] The invention described in claim 8 is characterized in that, in addition to the configuration of claim 7, a slide resistance member made of an elastic body is fixed to the outer peripheral surface of the inner slide tube or the inner peripheral surface of the outer slide tube that fit together, and the slide resistance member is in contact with the inner peripheral surface of the outer slide tube or the inner slide tube. [Effects of the Invention]

[0026] The joint structure of the steel pipe sheet pile of the present invention is provided with the configuration described in claim 1, so that even if the existing steel pipe sheet pile is eccentric, the eccentricity can be absorbed by the joint portion when driving the new steel pipe sheet pile, and the steel pipe sheet pile can be joined.

[0027] Furthermore, in the present invention, by providing the configuration of claim 2, it is possible to increase the movable distance in the tangential direction between the fixed support part and the movable support part.

[0028] Furthermore, in the present invention, by providing the configuration of claim 3, it is possible to restrict movement of the movable support part in the normal direction beyond what is expected between the fixed support plates facing each other.

[0029] Furthermore, in the present invention, by providing the configuration of claim 4, it is possible to restrict movement of the movable support part in the normal direction beyond what is expected between the fixed support plates facing each other.

[0030] Moreover, in the present invention, by providing the configuration of claim 5, it is possible to absorb eccentricity in the tangential direction of the steel pipe sheet pile.

[0031] Furthermore, in the present invention, by providing the configuration of claim 6, the fixed support plate and the movable support part can be reliably connected.

[0032] Furthermore, in the present invention, by providing the configuration of claim 7, it is possible to absorb positional deviation in the normal direction between the fixed support part and the movable support part due to extension and contraction of the slide key.

[0033] Furthermore, in the present invention, by providing the configuration of claim 8, it is possible to limit the displacement between the fixed support part and the movable support part. [Brief explanation of the drawings]

[0034] [Figure 1] 1 is a front view showing a steel pipe sheet pile continuous wall using the steel pipe sheet pile joint structure according to the present invention. [Figure 2] 2(a) is a partially enlarged plan view showing an example of a joint structure of the steel pipe sheet pile in FIG. 1, and FIG. 2(b) is a partially enlarged front view of the same. [Figure 3] FIG. [Figure 4] 1(a) is a partially enlarged plan view showing the state when the steel pipe sheet pile is eccentric in the joint structure of the steel pipe sheet pile, and FIG. 1(b) is a partially enlarged front view of the same. [Figure 5] FIG. 4 is an exploded perspective view showing another example of the joint structure of the steel pipe sheet pile. [Figure 6] FIG. 10 is an exploded perspective view showing yet another example of the joint structure of the steel pipe sheet pile. [Figure 7] 7A and 7B are enlarged cross-sectional views of the joint portion shown in FIG. 6, in which (a) is in a normal state, (b) is in a state stretched in a tangential direction, and (c) is in a state moved in a normal direction. [Figure 8] FIG. 4 is a vertical cross-sectional view showing another example of the telescopic slide key of the same. [Figure 9] FIG. 7 is an enlarged cross-sectional view showing another embodiment of the joint portion shown in FIG. 6. [Figure 10] FIG. 1 is a plan view showing an example of a joint structure of a conventional steel pipe sheet pile. DETAILED DESCRIPTION OF THE INVENTION

[0035] Next, an embodiment of a joint structure for a steel pipe sheet pile according to the present invention will be described based on the examples shown in Figures 1 to 5. In the figures, reference numeral 1 denotes a steel pipe sheet pile diaphragm wall, and reference numeral 2 denotes a steel pipe sheet pile 2 that constitutes the steel pipe sheet pile diaphragm wall. In this embodiment, a so-called "PP type" joint will be described as an example.

[0036] As shown in FIG. 1, the steel pipe sheet pile continuous wall 1 comprises a plurality of steel pipe sheet piles 2, 2 . . . driven vertically, and adjacent steel pipe sheet piles 2, 2 are connected via joint structures 3.

[0037] As shown in Figures 2 and 3, this joint structure 3 comprises a pair of joint members 4, 5 supported on the outer peripheries of adjacent steel pipe sheet piles 2, and both joint members 4, 5 are adapted to engage with each other.

[0038] This pair of joint members 4, 5 are respectively arranged at positions facing each other on the outer surfaces of the steel pipe sheet piles 2, 2 to be connected, so that the joint member 4 of one adjacent steel pipe sheet pile 2 engages with the joint member 5 of the other adjacent steel pipe sheet pile 2.

[0039] The joint member 4 is made of a joint steel pipe (hereinafter referred to as the joint steel pipe 4), and one end in the diameter direction is fixed to the outer peripheral surface of the steel pipe sheet pile 2 by welding or the like, and a vertical slit 6 is formed at a predetermined position in the circumferential direction.

[0040] The slit 6 is formed so that its width is wider than the thickness of the steel pipe 8 for the engaging body that constitutes the engaging portion of the other coupling member 5 described later, and the steel pipe 4 for the coupling body and the steel pipe 8 for the engaging body can be inserted vertically through the slit and engaged.

[0041] The joint member 5 comprises a support body 7 fixed to the outer periphery of the steel pipe sheet pile 2 and an engaging body (hereinafter referred to as an engaging body steel pipe 8) supported by the support body 7, and is configured to engage the engaging body steel pipe 8 supported by the support body 7 with the joint steel pipe 4.

[0042] The steel pipe 8 for the engaging body is made of a steel pipe, and one end in the diametrical direction is fixed to a movable support part 10 that constitutes the support body 7 by welding or the like, and a vertical slit 6 is formed at a predetermined position in the circumferential direction so that the steel pipe 8 for the engaging body engages with the steel pipe 4 for the joint that constitutes the joint member through their respective slits 6, 6.

[0043] The support body 7 comprises a fixed support part 9 fixed to the outer periphery of the steel pipe sheet pile 2 and a movable support part 10 having a steel pipe 8 for an engaging body supported at one end, and the movable support part 10 is capable of moving within a predetermined range in the tangential and normal directions relative to the fixed support part 9.

[0044] The fixed support portion 9 is composed of a pair of fixed support plates 9a, 9a facing each other at an interval in the normal direction, and a plate-shaped movable support portion 10 is inserted between the fixed support plates 9a, 9a.

[0045] Both fixed support plates 9a, 9a are formed in the shape of elongated plates made of steel plate or the like, and one of the long sides is fixed by welding or the like to the outer periphery of the steel pipe sheet pile 2 over the entire length of the steel pipe sheet pile 2. The normal distance between both fixed support plates 9a, 9a is slightly wider than the plate thickness of the plate-shaped movable support part 10 described later, so that the movable support part 10 can move slightly in the normal direction between both fixed support plates 9a, 9a.

[0046] The two fixed support plates 9a, 9a have through holes 11 formed at the same height and spaced apart in the axial direction of the steel pipe sheet pile 2, and a slide key 12 passes through the through holes 11 at the same height in the two fixed support plates 9a, 9a, and is held across the two fixed support plates 9a, 9a. The inner diameter of the through hole 11 is approximately the same as the outer diameter of the slide key 12.

[0047] The slide key 12 is formed into a round bar shape using a steel rod or the like, and both ends are fixed to the outer surfaces of the fixed support plates 9a, 9a, i.e., the surfaces opposite the opposing surfaces, by fasteners 13, 13. The dimensions of the fasteners 13 are larger than the diameter of the through-hole 11 and the vertical width (short side width) of the slide slot 14 (described later) so that the slide key 12 will not come out.

[0048] The movable support part 10 is formed in the shape of a long, narrow plate made of a steel plate or the like, and the steel pipe 8 for the engagement body is fixed to one of the long sides by welding or the like.

[0049] This movable support part 10 is formed to have approximately the same length as the fixed support plates 9a, 9a, and has multiple tangentially long sliding holes 14, 14... that are spaced apart in the vertical direction and penetrate the plate thickness direction to match the position of the slide key 12.

[0050] The length of the slide slot 14 is set according to the allowable sliding amount estimated in advance, and the movable support part 10 can move in the tangential direction relative to the fixed support part 9 until the slide key 12 held by the fixed support part 9 abuts against the end of the slide slot 14.

[0051] The movable support part 10 is inserted between the two fixed support plates 9a, 9a, and a slide key 12 is passed through the slide long holes 14, 14..., so that the movable support part 10 is connected to the fixed support part 9 via the slide key 12 so as to be movable in the tangential direction.

[0052] In the joint structure of the steel pipe sheet pile configured as above, when the new steel pipe sheet piles 2 are driven, if eccentricity occurs in the direction in which the steel pipe sheet piles 2 move away from each other in the tangential direction of the adjacent steel pipe sheet piles 2, the fixed support part 9 and the movable support part 10 will move away from each other as shown in FIG. tangential direction (X direction) and can tolerate eccentricity.

[0053] Furthermore, slight eccentricity in the normal direction (Y direction) of the steel pipe sheet pile 2 can be absorbed by the movable support portion 10 moving through the gap between the fixed support plates 9a, 9a.

[0054] In this way, in this joint structure, even if eccentricity occurs, the fixed support part 9 and the movable support part 10 can slide to reliably maintain the physical engagement of both joint members 4, 5, thereby ensuring the integrity of the steel pipe sheet pile 2. Furthermore, after engaging both joint members 4, 5 as necessary, a filler such as grout can be filled and solidified in the joint steel pipe 4 and the engaging steel pipe 8 to ensure stable engagement and watertight sealing.

[0055] In the above-described embodiment, the fixed support part 9 is composed of a pair of fixed support plates 9a, 9a, and a plate-shaped movable support part 10 having elongated sliding holes 14, 14... is movably inserted between the two fixed support plates 9a, 9a. However, as shown in FIG. 5, the movable support part 10 may be composed of a pair of movable support plates 10a, 10a facing each other at a distance, and a plate-shaped fixed support part 9 having elongated sliding holes 14, 14... is inserted between the movable support plates 10a, 10a.

[0056] Furthermore, in the above-described embodiment, the case where the movable support part 10 is provided with the elongated sliding holes 14, 14... and the fixed support part 9 is provided with the through hole 11 has been described, but the fixed support part 9 may be provided with the elongated sliding holes 14, 14... and the movable support part 10 may be provided with the through hole 11, or instead of the through hole 11, both the fixed support part 9 and the movable support part 10 may be provided with elongated sliding holes 14, 14... and the slide key 12 may be held in a state where it is inserted through the elongated sliding holes 14, 14... formed in the fixed support plates 9a, 9a and the movable support plates 10a, 10a.

[0057] Furthermore, the joint structure 3 of the steel pipe sheet pile according to the present invention is not limited to the above-mentioned embodiment, and may be, for example, as shown in Fig. 6, in which the fixed support part 9 and the movable support part 10 are each constituted by one plate material arranged on top of each other, and both plate materials 9, 10 are connected in a state in which they can move in the tangential direction and the normal direction via a slide key 20 passed through a through hole 11 and a long slide hole 14 (or long slide holes 14, 14 provided in both the fixed support part 9 and the movable support part 10 instead of the through hole 11). Note that the same reference numerals are used for the same components as those in the above-mentioned embodiment, and their explanations will be omitted.

[0058] In this case, the slide key may be, for example, a telescopic slide key 20 as shown in FIGS. 7 and 8, or a fixed-length slide key 26 as shown in FIG.

[0059] The telescopic slide key 20 comprises a cylindrical outer slide tube 21, an inner slide tube 22 that fits axially slidably with the outer slide tube 21, an elastic body 23 that urges the inner and outer slide tubes 21, 22 in the direction of contraction, and anti-detachment bodies 24, 24 fixed to the ends of the inner and outer slide tubes 21, 22.

[0060] The fixed support part 9 and the movable support part 10 are respectively formed with a through hole 11 (or a long slide hole 14) and a long slide hole 14 corresponding to the same height, and an extendable slide key 20 passes through the through hole 11 and the long slide hole 14 of the overlapping fixed support part 9 and movable support part 10, and the anti-slip bodies 24, 24 are engaged with the edge of the through hole 11 and the edge of the long slide hole 14, respectively.

[0061] The outer slide tube 21 and the inner slide tube 22 are formed in a cylindrical shape with different diameters, and are fitted together in a state where they can slide axially with each other.

[0062] In addition, one end of each of the outer slide tube 21 and the inner slide tube 22 is closed by a cover body that constitutes a retaining body 24, 24, and one end of each of the elastic bodies 23 is fixed to this cover body, so that the inner and outer slide tubes 21, 22 are forced in the contracting direction relative to each other.

[0063] The elastic body 23 is formed of, for example, a coil spring, and both ends of the elastic body 23 are fixed to the lid body in an elastically deformed state, so as to urge the inner and outer slide tubes 21, 22 in the contracting directions. Note that the elastic body 23 is not limited to a coil spring, and may be made of rubber or the like.

[0064] 8, a slide resistance member 25 made of an elastic material such as rubber is fixed to the outer peripheral surface of the inner slide tube 22 or the inner peripheral surface of the outer slide tube 21, which are fitted together, and the slide resistance member 25 is kept in contact with the inner peripheral surface of the outer slide tube 21 or the inner peripheral surface of the inner slide tube 22. The frictional resistance of the slide resistance member 25 prevents the inner and outer slide tubes 21, 22 from easily expanding and contracting, and the tangent and the tangent lines between the fixed support part 9 and the movable support part 10 are Normal Direction The displacement of the axial direction may be limited.

[0065] In this joint structure using the telescopic slide key 20, the telescopic slide key 20 held in the through hole 11 provided in the fixed support part 9 passes through the slide long hole 14 formed in the plate-shaped movable support part 10, and under normal conditions, as shown in Figure 7(a), the fixed support part 9 and the movable support part 10 are pressed against each other by the biasing force of the elastic body 23 of the telescopic slide key 20, and are connected in an overlapping state.

[0066] On the other hand, if the steel pipe sheet piles 2, 2 are eccentric in the tangential direction, the fixed support part 9 and the movable support part 10 move tangentially relative to each other through the sliding long holes 14, as shown in Figure 7(b), thereby absorbing the eccentricity.

[0067] Furthermore, if eccentricity occurs in the normal direction between the two steel pipe sheet piles, the telescopic slide key 20 extends against the biasing force of the elastic body 23, as shown in Figure 7(c), thereby absorbing the eccentricity in the normal direction.

[0068] The slide key 26 shown in Figure 9 is formed in the shape of a round bar and has anti-slip bodies 24, 24 at both ends that are larger than the vertical width of the slide slot 14 and the inner diameter of the through hole 10, and the anti-slip bodies 24, 24 engage with the edge of the slide slot 14 or the edge of the through hole 11, so that the two plate materials 9, 10 are connected in a state where they can move in the tangential and normal directions via the slide key 26 passed through the through hole 11 and the slide slot 14.

[0069] In this case, the amount of tangential displacement between the fixed support part 9 and the movable support part 10 is set by the horizontal width (longitudinal width) of the slide slot 14, but the amount of normal displacement between the fixed support part 9 and the movable support part 10 can be determined by the plate thickness of the fixed support part 9, the plate thickness of the movable support part 10, and the length of the slide key 26.

[0070] In the above embodiment, the "PP type" joint is used as an example, but the present invention can also be applied to "LT type" joints or "PT type" joints. [Explanation of symbols]

[0071] 1 Steel pipe sheet pile diaphragm wall 2 Steel pipe sheet piles 3 Joint structure 4. Joint materials (steel pipes for joints) 5 Joint members 6 Slit 7 Support 8 Engaging body (steel pipe for engaging body) 9 Fixed support part 10 Movable support part 11 Through hole 12 Slide Key 13 Fixtures 14 Slide slot 20 Slide key (extendable slide key) 21 Outer slide tube 22 Inner slide tube 23 Elastic Body 24 Stopper body 25 Slide resistance member 26 Slide Key

Claims

1. A steel pipe sheet pile diaphragm wall consisting of a plurality of steel pipe sheet piles, A joint structure for steel pipe sheet piles, comprising a pair of joint members supported on the outer peripheries of adjacent steel pipe sheet piles, and the joint members are engaged with each other, One or both of the coupling members includes a support member fixed to the outer periphery of the steel pipe sheet pile and an engaging body supported by the support member, The support body includes a fixed support part fixed to the outer periphery of the steel pipe sheet pile and a movable support part having the engaging body supported at one end thereof, A plurality of slide slots that are long in the tangential direction of the steel pipe sheet pile continuous wall are formed at intervals in the vertical direction in either the fixed support portion or the movable support portion, A steel pipe sheet pile joint structure characterized in that a plurality of slide keys held at intervals in the vertical direction on either the fixed support portion or the movable support portion are inserted into the slide long holes, and the fixed support portion and the movable support portion are connected via the slide keys so as to be movable in the tangential direction of the steel pipe sheet pile continuous wall and in a normal direction perpendicular to the tangential direction of the steel pipe sheet pile continuous wall.

2. A steel pipe sheet pile joint structure as described in claim 1, wherein the slide key is held in a state where it is inserted into a slide long hole that is long in the tangential direction of the steel pipe sheet pile continuous wall formed in either the fixed support portion or the movable support portion.

3. 3. A joint structure for a steel pipe sheet pile as described in claim 1 or 2, wherein the fixed support portion is composed of a pair of fixed support plates facing each other at a distance from each other, and the plate-shaped movable support portion is inserted between the fixed support plates.

4. 3. A joint structure for a steel pipe sheet pile as described in claim 1 or 2, wherein the movable support portion is composed of a pair of movable support plates facing each other at a distance from each other, and the plate-shaped fixed support portion is inserted between the movable support plates.

5. 3. The joint structure of a steel pipe sheet pile according to claim 1, wherein the fixed support portion and the movable support portion are constituted by a pair of plate members arranged overlapping each other.

6. The steel pipe sheet pile joint structure of claim 5, wherein the slide key has a retaining body at both ends that is larger than the vertical width of the slide long hole, and when the retaining body engages with the edge of the slide long hole, the slide key and the slide long hole move relative to each other in the tangential direction of the steel pipe sheet pile continuous wall.

7. 7. A joint structure for a steel pipe sheet pile as described in claim 5 or 6, wherein the slide key comprises a cylindrical outer slide pipe, an inner slide pipe that is axially slidably fitted with the outer slide pipe, and an elastic body that urges the inner and outer slide pipes toward each other in a contracting direction.

8. 8. A joint structure of a steel pipe sheet pile according to claim 7, wherein a slide resistance member made of an elastic body is fixed to the outer peripheral surface of the inner slide pipe or the inner peripheral surface of the outer slide pipe that are fitted together, and the slide resistance member is in contact with the inner peripheral surface of the outer slide pipe or the inner slide pipe.

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