JP7514194B2 - Steel pipe sheet pile joint structure - Google Patents

Description

The present invention relates to a joint structure for steel pipe sheet piles that connects adjacent steel pipe sheet piles.

Continuous steel pipe sheet pile walls, used for retaining walls and steel pipe sheet pile well foundations, are connected between adjacent steel pipe sheet piles via joint structures.

The joint structure of this type of steel pipe sheet pile consists of a pair of joint members supported on the outer periphery of adjacent steel pipe sheet piles that engage with each other, and three types of joints are widely used as standard: the so-called "L-T type" joint, the "P-T type" joint, and the "P-P type" joint.

The "L-T type" joint comprises a pair of angle irons fixed facing each other to the outer periphery of one of the adjacent steel pipe sheet piles, and a T-shaped steel supported on the outer periphery of the other steel pipe sheet pile. The fixed support piece of the T-shaped steel is inserted into the gap between the angle irons supported by one of the steel pipes, and the engaging part supported by the fixed support piece engages with both angle irons.

A "P-T type" joint comprises a joint steel pipe fixed to the outer circumferential surface of one of the adjacent steel pipe sheet piles and a T-shaped steel supported on the outer circumferential surface of the other steel pipe sheet pile. A fixed support piece of the T-shaped steel is inserted into a slit in the joint steel pipe supported by one of the steel pipes, and the engaging part supported by the fixed support piece engages with the joint steel pipe (see, for example, non-patent document 1).

In a "PP type" joint, a joint steel pipe is fixed to the outer periphery 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.

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

In the management of the placement of steel pipe sheet pile foundations connected by joint structures, generally, no management standard values are given for the inclination of the steel pipe sheet piles, and the amount of eccentricity when viewed from a plan view is stipulated to be within 300 mm (see, for example, Non-Patent Document 2).

General management standards for the driving of prefabricated piles (steel pipe piles and concrete piles), which are stricter than those for steel pipe sheet piles, stipulate that the amount of eccentricity in plan view must be 1/4 of the pile diameter and no more than 100 mm, and that the inclination of the pile must be no more than 1/100 (see, for example, Non-Patent Document 1).

Here, a "1/100 inclination" of the pile inclination means that for a 10m long pile, 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.

On the other hand, in this type of joint structure, the dimensions of the joint components are standardized; for example, an example of a "P-T type" joint is known to have the dimensions shown in Figure 10.

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

This physical allowable eccentricity will be specifically explained using the "P-T type" joint shown in Figure 10 as an example. Regarding the directions in the figure, the tangential direction is the X direction and the normal direction is the Y direction, based on the steel pipe sheet pile wall.

For the "P-T type" joint shown in Figure 10, the standard joint spacing (the distance between the steel pipes that make up the steel pipe sheet pile wall) when the steel pipe sheet pile is ideally installed without eccentricity is 180 mm.

The allowable physical eccentricity in the Y direction only is determined by the width of the slit formed in the joint steel pipe and the plate thickness of the fixed support piece of the T-shaped steel. In the "P-T type" joint shown in Figure 10, the standard slit width is 30 mm, so it is approximately 15 mm in both the positive and negative directions.

On the other hand, the allowable physical eccentricity in the X direction only is determined by the X direction width of the fixed support piece, the plate thickness of the engagement part supported by the fixed support piece, and the Y direction width. In the "P-T type" joint shown in Figure 10, it is approximately 30 mm in the direction in which the distance between the steel pipe sheet piles increases (hereinafter referred to as the extension direction), and approximately 16 mm in the direction in which the distance between the steel pipe sheet piles decreases (hereinafter referred to as the contraction direction).

Therefore, the allowable eccentricity in the X direction alone, where both joint members can physically engage, is approximately 46 mm (30 mm + 16 mm) in both the extension and contraction directions, which is less than the 100 mm driving error permitted by the construction management standards for prefabricated piles.

The allowable eccentricity angle at which both steel pipe piles can physically engage is approximately 15° in both the positive and negative directions.

In addition, in the case of so-called hat-shaped steel sheet piles, two sheet pile members each shaped like a steel sheet pile split in half are connected via a folded rubber joint member, allowing expansion, contraction and bending deformation between the two sheet pile members (see, for example, Patent Document 1).

JP 2008-184867 A

Standardization of Accessories for Steel Pipe Piles and Steel Pipe Sheet Piles (Revised 10th Edition), Steel Pipe Pile and Steel Pipe Sheet Pile Technology Association, May 2018 Civil Engineering Construction Management Standards and Standard Values (draft), Ministry of Land, Infrastructure, Transport and Tourism, March 2018

However, as mentioned above, the driving of steel pipe sheet piles is limited to the allowable eccentricity in the X direction (approximately 46 mm in the example shown in Figure 10) at which both joint members can physically engage, so the pile length that can tolerate a pile eccentricity of 46 mm (= 30 mm + 16 mm) based on the construction management standard value of 1/100 for the inclination of prefabricated piles described in Non-Patent Document 1 is 4.6 m.

In other words, in the conventional technology described above, when the length of the steel pipe sheet pile is 4.6 m or more, even if the pile eccentricity is within the allowable range of the construction management standards for prefabricated piles (100 mm or less) or the allowable range of the construction management standards for steel pipe sheet pile foundations (300 mm or less), if the pile eccentricity is 46 mm or more, it becomes difficult to engage the two joint components, and there is a risk that the joint will come loose.

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 even stricter, and this problem becomes more pronounced the longer the steel pipe sheet pile.

In addition, in conventional techniques such as those in Patent Document 2, the joint members are thick, so they receive a large amount of resistance from the ground when pouring, making pouring difficult. There is also the problem that the joint members are easily damaged when penetrating the ground.

In view of these conventional problems, the present invention was made with the objective of providing a joint structure for steel pipe sheet piles that can reliably maintain the joint engagement even if eccentricity occurs within the construction management standards for steel pipe sheet piles during installation.

The invention described in claim 1 for solving the above-mentioned problems in the related art is characterized in that in a steel pipe sheet pile joint structure comprising a pair of joint members supported on the outer periphery of adjacent steel pipe sheet piles, the two joint members being engaged with each other, one of the joint members comprising a support portion fixed to the outer periphery of the steel pipe sheet pile and an engaging portion supported by the support portion, the support portion comprising a fixed support piece fixed to the outer periphery of the steel pipe sheet pile, a movable support piece movable relative to the fixed support piece in the tangential direction of the steel pipe sheet pile, and a connecting member having elasticity and flexibility interposed between the fixed support piece and the movable support piece, the fixed support piece and the movable support piece being connected to each other via the connecting member, and the engaging portion being supported by the movable support piece.

The invention described in claim 2 is characterized in that, in addition to the configuration of claim 1, the fixed support piece and the movable support piece are formed in a flat plate shape facing each other, and a plate-shaped connecting member is sandwiched between the fixed support piece and the movable support piece.

The feature of the invention described in claim 3 is that, in addition to the configuration of claim 1, the fixed support piece and the movable support piece are butted against each other in the tangential direction of the steel pipe sheet pile, a flat connecting member is superimposed across the fixed support piece and the movable support piece, the ends of the connecting member are fixed to the fixed support piece and the movable support piece, respectively, and the fixed support piece and the movable support piece are connected via the connecting member .

The feature of the invention described in claim 4 is that, in addition to the configuration of claim 1, the fixed support piece and the movable support piece are arranged at a distance from each other in the tangential direction of the steel pipe sheet pile, the ends of a connecting member spanning the fixed support piece and the movable support piece are fixed to the fixed support piece and the movable support piece, respectively, and the fixed support piece and the movable support piece are connected via the connecting member .

The feature of the invention described in claim 5 is that, in addition to the configuration of claim 4, the connecting member is arranged in a bent state.

The invention described in claim 6 is characterized in that, in addition to the configuration of any one of claims 3 to 5, it is provided with a pressing member that fixes the ends of the connecting member to the fixed support piece and the movable support piece, respectively, and a protective member whose ends are fixed to both pressing members, and one end of the protective member is releasably fixed to the pressing member or the protective member is removable.

The invention described in claim 7 is characterized in that, in addition to the configuration of any one of claims 1 to 6, the lower end of the support part is provided with a wedge-shaped tip shoe that narrows downward.

The invention described in claim 8 is characterized in that, in addition to the configuration of any one of claims 1 to 7, the connecting member has an elongation suppressing member disposed within a rubber main body portion, the elongation suppressing member having a smaller elongation rate than the main body portion.

The joint structure of the steel pipe sheet pile according to the present invention has the configuration of claim 1, and therefore can maintain a physical engagement state between the joint members at any location in the vertical direction, even when the steel pipe sheet pile is driven in accordance with the construction management standards for steel pipe sheet piles. Furthermore, even if the existing steel pipe sheet pile is eccentric, the eccentricity can be absorbed by the joint when driving the new steel pipe sheet pile, and the eccentricity of the steel pipe sheet pile can be corrected.

In addition, by providing the configurations of claims 2 to 5 in the present invention, the fixed support piece and the movable support piece can be connected in a stable state, and when the tangential distance of the steel pipe sheet pile becomes wide, the fixed support piece and the movable support piece can be suitably moved relative to each other via the connecting member.

In addition, by providing the configuration of claim 6 in the present invention, the movable support piece can be stably supported by the fixed support piece under normal circumstances, and when the amount of eccentricity becomes large, the protective member is released from one of the pressing members, and the fixed support piece and the movable support piece become movable relative to each other.

Furthermore, in the present invention, by providing the configuration of claim 7, when driving the steel pipe sheet pile, the resistance during penetration into the ground is reduced, damage to the movable support piece is prevented, and both joint members can be connected appropriately.

Furthermore, in the present invention, by providing the configuration of claim 8, excessive deformation of the connecting member can be suppressed.

FIG. 1 is a front view showing a steel pipe sheet pile continuous wall using a joint structure of a steel pipe sheet pile according to the present invention. FIG. 2 is a cross-sectional view showing an example of a joint structure of the steel pipe sheet pile in FIG. 1 . FIG. FIG. 4 is an enlarged perspective view, partially in section, showing a lower end portion of the support portion of the same. 11A and 11B are cross-sectional views showing the state of the joint when the above-mentioned steel pipe sheet pile is eccentric, in which (a) shows the case where the eccentricity is small, and (b) shows the case where the eccentricity is large. 6(a) is a cross-sectional view showing another example of a joint structure of a steel pipe sheet pile according to the present invention, and FIG. 6(b) is an enlarged cross-sectional view showing the joint member in FIG. 6(a). 11A and 11B are cross-sectional views showing the state of the joint when the above-mentioned steel pipe sheet pile is eccentric, in which (a) shows the case where the eccentricity is small, and (b) shows the case where the eccentricity is large. FIG. 4 is a cross-sectional view showing yet another example of a joint structure of a steel pipe sheet pile according to the present invention. 11A and 11B are cross-sectional views showing the state of the joint when the above-mentioned steel pipe sheet pile is eccentric, in which (a) shows the case where the eccentricity is small, and (b) shows the case where the eccentricity is large. FIG. 1 is a cross-sectional view showing a joint structure of a conventional steel pipe sheet pile.

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

The steel pipe sheet pile continuous wall 1 comprises multiple steel pipe sheet piles 2 driven vertically, with adjacent steel pipe sheet piles 2, 2 connected via joint structures 3.

This joint structure 3 has a pair of male and female joint members 4, 5 supported on the outer periphery of adjacent steel pipe sheet piles 2, and the two joint members 4, 5 are designed to engage with each other.

This pair of male and female joint members 4, 5 are arranged at the ends 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.

As shown in FIG. 2, the joint member 4 is made of a joint steel pipe (hereinafter referred to as the joint steel pipe 4), one diametric end of which is fixed to the outer circumferential surface of the steel pipe sheet pile 2 by welding or the like, and a vertical slit 6 is formed on the other end.

The slit 6 is formed so that its tangential width is wider than the thickness of the support part 7 of the other joint member 5 (described later), allowing the support part 7 to be inserted in the vertical direction.

The joint member 5 has a support portion 7 fixed to the outer periphery of the steel pipe sheet pile 2 and an engagement portion 8 supported by the support portion 7. The support portion 7 is inserted into the slit 6 of the joint steel pipe 4, and the engagement portion 8 is engaged with the joint steel pipe 4.

As shown in Figures 2 and 3, the support part 7 comprises a fixed support piece 9 fixed to the outer periphery of the steel pipe sheet pile 2, a movable support piece 10 movable relative to the fixed support piece 9 in the tangential direction of the steel pipe sheet pile 2, and a connecting member 11 having elasticity and flexibility interposed between the fixed support piece 9 and the movable support piece 10, and the fixed support piece 9 and the movable support piece 10 facing each other are overlapped and connected via the connecting member 11, and the engagement part 8 is supported by the movable support piece 10.

In addition, as shown in Figures 3 and 4, the lower end of the support part 7 is equipped with a wedge-shaped tip shoe 12 that narrows downward, so that there is less resistance when the steel pipe sheet pile 2 is driven into the ground.

The tip shoe 12 is made of a pair of inclined plates 13, 13 made of steel plates or the like, and a cover plate 18, 18 that extends upward from the upper end of each inclined plate 13, 13 and covers the surface of the fixed support piece 9 and the movable support piece 10, respectively. The inclined plates 13, 13 are arranged at an angle so that their lower ends are adjacent to each other and joined to form a wedge shape.

The tip shoe 12 has a cover plate 18 firmly fixed to the surface of the fixed support piece 9 by welding or the like, and is supported by the lower end of the support part 7.

On the other hand, the other cover plate 18 is not fixed to the movable support piece 10, and the fixed support piece 9 and the movable support piece 10 can slide in the tangential direction. The cover plate 18 may be temporarily fixed by welding or the like so that it will come off when a certain force is applied to the movable support piece 10.

The fixed support piece 9 is formed into a flat plate using a steel plate or the like, with its longitudinal direction facing up and down, and one side edge in the tangential direction (X direction) is fixed by welding to the outer periphery of the steel pipe sheet pile 2.

At predetermined positions on the steel pipe welding side of the support portion 7 of the fixed support piece 9, multiple fixing rods 15, 15... such as stud bolts are provided at intervals above and below.

The movable support piece 10 is formed in a flat plate shape using a steel plate or the like, with its longitudinal direction facing up and down, and a flat engagement part 8 is integrally supported on one side edge in the tangential direction (X direction).

At a predetermined position on the engaging portion 8 side of this movable support piece 10, a number of fixing rods 15, 15, such as stud bolts, are provided at intervals above and below.

The engagement part 8 is formed in a flat plate shape using a steel plate or the like, and its back side is integrally supported by one side edge of the movable support piece 10, so that the movable support piece 10 and the engagement part 8 form a T-shape in plan view.

The engagement portion 8 is positioned to one side of the center of the movable support piece 10 by the thickness of the fixed support piece 9 and the connecting member 11, and is positioned symmetrically with respect to the center of the support part 7.

As shown in FIG. 4, the connecting member 11 is formed in a flat plate shape with a rubber main body 11a, 11a and an elongation suppressing member 11b with a smaller elongation rate than the main body, and is held in a sandwiched state between the fixed support piece 9 and the movable support piece 10.

The connecting member 11 may be integrally formed from a material having elasticity and flexibility, such as rubber, without providing the extension suppression member 11b.

This connecting member 11 has a number of through holes 14, 14... that penetrate in the plate thickness direction at both ends in the tangential direction (X direction) and are spaced apart in the height direction, and fixing rods 15, 15... that protrude from the fixed support piece 9 and the movable support piece 10 are respectively passed through.

In addition, thin plate-shaped pressure plates 16, 16 are placed on the end surfaces of the connecting member 11 in accordance with the positions of the fixing rods 15, 15... protruding from the fixed support piece 9 and the movable support piece 10, and the fixing rods 15, 15... penetrate the pressure plates 16, 16, and their ends are fixed to the surface of the pressure plates 16 by nuts 17 or the like, so that one end of the connecting member 11 is sandwiched between the fixed support piece 9 and the pressure plates 16, 16, and the other end is sandwiched between the movable support piece 10 and the pressure plates 16, 16.

The joint structure 3 of the steel pipe sheet pile 2 constructed in this manner has the support part 7, which is formed by overlapping the fixed support piece 9, the connecting member 11, and the movable support piece 10 of the joint member 5, inserted into the slit 6 formed in the joint steel pipe 4, and the engagement part 8 supported by the support part 7 is inserted into the inside of the joint steel pipe, and the steel pipe sheet pile 2 is driven in this state.

At that time, the connecting member 11 is protected by being sandwiched between the fixed support piece 9 and the movable support piece 10 made of steel plates, making it less likely to break even if it receives resistance from the ground.

When new steel pipe sheet piles 2 are driven, if eccentricity occurs in the tangential direction of adjacent steel pipe sheet piles 2 in a direction that moves the steel pipe sheet piles 2 away from each other, if the eccentricity is small, the eccentricity can be tolerated up to a position where the engaging portion 8 abuts against the inside of the joint steel pipe, as shown in Figure 5 (a).

On the other hand, if the eccentricity becomes greater than the position shown in FIG. 5(a), the elasticity and flexibility of the connecting member 11 are utilized to allow the fixed support piece 9 and the movable support piece 10 to slide relative to each other in the tangent direction (X direction) of the steel pipe sheet pile, as shown in FIG. 5(b).

In addition, the elasticity and flexibility of the connecting member 11 can be utilized to accommodate eccentricity in the normal direction (Y direction) and rotational direction of the steel pipe sheet pile, which is greater than that of the conventional joint structure 3.

In this way, in this joint structure 3, even if eccentricity occurs, the joint member 5 can be extended by the connecting member 11 according to the amount of eccentricity, so that the two joint members 4, 5 can be reliably maintained in a physically engaged state, and the integrity of the steel pipe sheet pile 2 can be ensured. In addition, after engaging the two joint members 4, 5 as necessary, a filler such as grout can be filled and solidified inside the joint steel pipe 4 to ensure stable engagement and watertightness.

Next, another embodiment of the joint structure of the steel pipe sheet pile according to the present invention will be described with reference to Figures 6 and 7. Note that the same components as those in the above-mentioned embodiment will be given the same reference numerals and the description will be omitted.

This joint structure has a pair of male and female joint members 4, 20 supported on the outer periphery of adjacent steel pipe sheet piles 2, 2, and the two joint members 4, 20 are designed to engage with each other.

This pair of male and female joint members 4, 20 are arranged at the ends 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 and the joint member 20 of the other adjacent steel pipe sheet pile 2 form a male and female pair.

As in the above-mentioned embodiment, one of the joint members 4 is made of a joint steel pipe 4 (hereinafter referred to as the joint steel pipe 4), one end in the diametric direction is fixed to the outer circumferential surface of the steel pipe sheet piles 2, 2 by welding or the like, and a vertical slit 6 is formed on the other end side.

The slit 6 is formed so that its tangential width is wider than the thickness of the support part 21 of the other joint member 20 (described later), allowing the support part 21 to be inserted in the vertical direction.

The other joint member 20 has a support part 21 fixed to the outer periphery of the other steel pipe sheet pile 2 and an engagement part 22 supported by the support part 21. The support part 21 is inserted into the slit 6 of the joint steel pipe 4, and the engagement part 22 is engaged with the joint steel pipe 4.

As shown in FIG. 6, the support portion 21 has a fixed support piece 23 and a movable support piece 24 that are butted against each other in the tangential direction (X direction), and flat connecting members 25, 25 are superimposed on both sides of the fixed support piece 23 and the movable support piece 24, straddling the fixed support piece 23 and the movable support piece 24.

The fixed support piece 23 and the movable support piece 24 are formed into flat plates of the same thickness using steel plates or the like, and one side edge of the fixed support piece 23 is fixed to the outer periphery of the steel pipe sheet pile 2 by welding, and the movable support piece 24 is butted against the other side edge.

On the other hand, a flat engaging portion 22 is supported integrally on the other side edge of the movable support piece 24, and the movable support piece 24 and the engaging portion 22 form a T-shape in plan view.

In addition, multiple fixing rods 26, 26... such as stud bolts protrude from the fixed support piece 23 and the movable support piece 24 at predetermined positions on both the front and back sides at intervals above and below.

The connecting members 25, 25 are formed in a flat plate shape from a material having elasticity and flexibility, such as rubber, and are overlapped while straddling the fixed support piece 23 and the movable support piece 24. One end of the connecting members 25, 25 in the tangential direction (X direction) is clamped between the pressing member 27 and the fixed support piece 23, and the other end is clamped between the pressing member 27 and the movable support piece 24.

The pressing members 27, 27 have a fixed portion 27a fixed to the fixed support piece 23 or the movable support piece 24, and a pressing portion 27b supported by the fixed portion 27a. By passing the fixing bar 26 through the fixed portion 27a and tightening the nut 28, the pressing portion 27b is pressed against the surface of the connecting members 25, 25, and one end in the tangential direction (X direction) is clamped between the pressing member 27, 27 and the fixed support piece 23, and the other end is clamped between the pressing member 27, 27 and the movable support piece 24.

In addition, between the pressing members 27, 27 arranged at a distance in the tangential direction (X direction) of the fixed support piece 23 and the movable support piece 24, plate-shaped protective members 29, 29 are placed on the outside of the connecting member 25 to protect it, and the ends of the protective members 29, 29 are fixed to the pressing members 27, 27.

The protective members 29, 29 are butted together in the tangential direction (X direction), and the butted ends are temporarily welded together to form a single plate, so that they can be separated from each other when a certain force is applied. Each of the protective members 29, 29 is formed from a single plate-shaped member.

The protective members 29, 29 may also be temporarily welded at their ends to one of the pressing members 27, 27 so that they can be detached from the pressing members 27, 27 when the displacement acting on the support portion 21 in the normal direction (Y direction) exceeds a predetermined displacement amount. In this way, the protective members 29 can be detached from the pressing members 27, 27 to prevent damage to the connecting members 25, 25 caused by the ends of the protective members 29, 29.

In the joint structure of the steel pipe sheet pile configured in this manner, when new steel pipe sheet piles 2, 2 are driven, if eccentricity occurs in the tangential direction (X direction) of adjacent steel pipe sheet piles 2, 2 in the direction in which the steel pipe sheet piles 2, 2 move away from each other, if the eccentricity is small, the eccentricity can be tolerated up to the position where the engaging portion 22 abuts against the inside of the joint steel pipe 4, as shown in Figure 7 (a).

On the other hand, if the eccentricity becomes greater than the position shown in FIG. 7(a), the protective members 29, 29 will detach from each other as shown in FIG. 7(b), and the fixed support piece 23 and the movable support piece 24 will be able to move away from each other via the connecting members 25, 25, thereby allowing the eccentricity to be tolerated.

In the above embodiment, the fixed support piece 23 and the movable support piece 24 are butted against each other. However, as shown in Figures 8 and 9, the fixed support piece 23 and the movable support piece 24 may be spaced apart from each other in the tangential direction (X direction) of the steel pipe sheet pile 2, and the ends of the connecting members 25, 25 that span the fixed support piece 23 and the movable support piece 24 may be fixed to the fixed support piece 23 and the movable support piece 24, respectively. The same reference numerals are used for the same configurations as in the above embodiment, and the description thereof will be omitted.

The connecting members 25, 25 may be arranged in a bent state as shown in Figures 8 and 9. In this case, as shown in Figure 9(b), when the steel sheet pile becomes eccentric, the amount of movement between the fixed support piece 23 and the movable support piece 24 increases by the amount of bending.

In the above embodiment, the connecting members 25, 25 are bent into a semicircular shape, but this is not limited to the embodiment, and the connecting members 25, 25 may be bent into a Z-shape, a C-shape, etc.

In addition, while the above embodiment uses a "P-T type" joint as an example, the present invention can also be applied to "L-T type" joints or "P-P type" joints.

1 Steel pipe sheet pile continuous wall 2 Steel pipe sheet pile 3 Joint structure 4 Joint member (steel pipe for joint)
Reference Signs List 5: joint member 6: slit 7: support portion 8: engagement portion 9: fixed support piece 10: movable support piece 11: connecting member 12: tip shoe 13: inclined plate 14: through hole 15: fixing rod 16: pressing plate 17: nut 18: cover plate 20: joint member 21: support portion 22: engagement portion 23: fixed support piece 24: movable support piece 25: connecting member 26: fixing rod 27: pressing member 28: nut 29: protective member

Claims (8)

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, the two joint members being engaged with each other,
One of the joint members includes a support portion fixed to an outer periphery of the steel pipe sheet pile and an engagement portion supported by the support portion,
The support portion comprises a fixed support piece fixed to the outer periphery of the steel pipe sheet pile, a movable support piece that is movable relative to the fixed support piece in the tangential direction of the steel pipe sheet pile, and a connecting member having elasticity and flexibility interposed between the fixed support piece and the movable support piece, wherein the fixed support piece and the movable support piece are connected via the connecting member, and the engagement portion is supported by the movable support piece, thereby forming a joint structure for a steel pipe sheet pile. The joint structure of the steel pipe sheet pile according to claim 1, in which the fixed support piece and the movable support piece are formed as flat plates facing each other, and a plate-shaped connecting member is sandwiched between the fixed support piece and the movable support piece. A joint structure for a steel pipe sheet pile as described in claim 1, wherein the fixed support piece and the movable support piece are butted against each other in the tangential direction of the steel pipe sheet pile , a flat connecting member is superimposed across the fixed support piece and the movable support piece, and ends of the connecting member are fixed to the fixed support piece and the movable support piece, respectively, and the fixed support piece and the movable support piece are connected via the connecting member . A joint structure for a steel pipe sheet pile as described in claim 1, wherein the fixed support piece and the movable support piece are arranged at a distance from each other in the tangential direction of the steel pipe sheet pile, and ends of a connecting member spanning the fixed support piece and the movable support piece are fixed to the fixed support piece and the movable support piece, respectively, and the fixed support piece and the movable support piece are connected via the connecting member. The joint structure of a steel pipe sheet pile according to claim 4, in which the connecting member is arranged in a bent state. A joint structure for a steel pipe sheet pile according to any one of claims 3 to 5, comprising a pressing member that fixes the ends of the connecting member to the fixed support piece and the movable support piece, respectively, and a protective member whose ends are fixed to both pressing members, and one end of the protective member is removably fixed to the pressing member or the protective member is removable. A joint structure for a steel pipe sheet pile according to any one of claims 1 to 6, in which the lower end of the support part is provided with a wedge-shaped tip shoe that narrows downward. The joint structure of a steel pipe sheet pile according to any one of claims 1 to 7, wherein the connecting member has an elongation suppressing member having an elongation rate smaller than that of a rubber main body portion disposed within the main body portion.

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