JP4867936B2 - Steel pipe sheet pile and steel pipe sheet pile connection structure - Google Patents

Description

  The present invention relates to a steel pipe sheet pile and a connection structure of steel pipe sheet piles, and is mainly used when constructing a retaining wall, a steel pipe sheet pile foundation, or the like.

  As a civil engineering structure using a steel pipe sheet pile, for example, a steel pipe sheet pile foundation as shown in FIG. 14 is known. Steel pipe sheet pile foundations are installed on the construction site so as to reach a good quality support layer by combining them in a closed shape such as a circle or rectangle at the construction site. It is used as a foundation for bridges.

  At that time, adjacent steel pipe sheet piles are fitted with joints made of shape steel and / or steel pipes respectively attached to opposite sides of the steel pipe sheet pile main pipe, and excavated earth and sand in the joint fitting space, It is connected by filling with mortar after washing.

The PP type joint as shown in FIG. 15 is one in which a steel pipe provided with a slit 21a is used as a joint member (joint steel pipe 21). The joint steel pipe 21 is widely used with an outer diameter of 165.2 mm, a plate thickness of 9 mm to 11 mm, and an inner surface having no uneven surface such as a protrusion. The filler 22 such as mortar filled in the joint space has a compressive strength of about 20 N / mm ² .

  By the way, when a horizontal external force acts on the steel pipe sheet pile foundation, a shearing force is applied to the joint connecting portion of the steel pipe sheet pile in the axial direction of the steel pipe. When this shearing force increases, the displacement of the joint connecting portion increases rapidly, and the degree of decrease in the bending rigidity of the entire steel pipe sheet pile foundation increases. That is, the overall bending rigidity of the steel pipe sheet pile foundation is greatly influenced by the shear strength of the joint connecting portion.

  In the case of a PP type joint, the shear strength of the joint connecting portion is generally determined by the occurrence of an interface shift between the joint steel pipe and the mortar (breakage of adhesion between the joint steel pipe and the mortar). Then, the following techniques are proposed in order to improve the adhesive force of the steel pipe for joints and mortar.

  In Non-Patent Document 1, as shown in FIG. 17 (a), a steel pipe with an inner surface protrusion is used as a steel pipe 41 for a joint of a P-P type joint so as to increase the adhesion with a mortar. ing.

  Also, in Patent Document 2, as shown in FIG. 17 (b), as in Non-Patent Document 1, a steel pipe with an inner surface protrusion is used as a steel pipe 41 for a joint of a PP joint, and the adhesion to mortar is further increased. In order to reinforce the connection part of the steel pipe 41 for joints and the steel pipe sheet pile main pipe 40 which may become a problem when it raises, what has arrange | positioned the reinforcement member 42 is described.

  In Patent Document 3, as shown in FIG. 18, a steel pipe with inner and outer surface protrusions is used as the joint steel pipe 51 to increase the adhesive force with the mortar.

  Here, in the PP type joint, three spaces are formed when the joints are fitted together. When using steel pipes with internal protrusions described in Non-Patent Document 1 and Patent Document 2, protrusions are formed on the steel surface facing only the central chamber (B chamber in Fig. 17 (a)) among the three chambers described above. Has been.

  Therefore, with the structures of Non-Patent Document 1 and Patent Document 2, only the central chamber can be expected to improve the shear strength. In this structure, if striking occurs during construction, the central chamber may be narrowed. In that case, the central chamber cannot be cleaned, and sufficient adhesion between the mortar and the steel material cannot be obtained. It is feared that the shear strength to be exerted cannot be surely exhibited.

  In this respect, the structure described in Patent Document 3 is expected to improve the shear strength in two chambers other than the central chamber. However, when the steel pipe sheet pile main pipe 50 and the joint steel pipe 51 are welded, the outer surface protrusion becomes an obstacle.

  Therefore, it becomes difficult to sufficiently weld the steel pipe sheet pile main pipe 50 and the joint steel pipe 51 so as to exceed the shear strength of the welded portion, and much labor and cost are required. In addition, it is very difficult to produce a steel pipe with inner and outer projections by rolling, and the production cost is also expensive.

  As a method for improving the shear strength of joint joints in joints other than the PP type (or joints not limited to the PP type), as with the PP type joint, importance is attached to the adhesion between the steel material and the mortar. For example, a method of increasing the adhesion force with the filler by welding the deformed bar steel 34, 35 to the outer peripheral surface of the joint members 31, 32, 33 or the steel pipe sheet pile main pipe 30 as in Patent Document 1 is known. (FIG. 16).

  Alternatively, as shown in Patent Document 4, in order to sufficiently wash the inside of the joint fitting space and fill the filler while improving the adhesion between the steel material and the mortar, The arm portion of one L-shaped joint member (female) 61 is disposed outward, and the arm portion of the other L-shaped joint member (male) 62 is disposed inward. A steel pipe sheet pile connection structure is known in which a plurality of protruding rod-like steel members 63 are arranged on the circumferential surface of the sandwiched steel pipe sheet pile main pipe 60 at intervals of three times the diameter of the rod-like steel member 63 (FIG. 19). ).

  However, the method described in Patent Document 1 does not limit the method of arranging the deformed steel bars. As will be described later, in order to improve the shear strength, deformed steel bars should be arranged on the opposing surfaces of the space filled with the filler, and the method of Patent Document 1 has sufficient adhesion strength between the steel and the mortar. There was a problem that it could not be demonstrated.

  Moreover, in the structure described in patent document 4, since the inside of a joint fitting space can fully be wash | cleaned, the filling work efficiency of a filler improves. On the other hand, in this structure, although the shear strength is determined by the interval of the male member, the female member is wider than the interval and the space formed thereby is filled with the filler. This is disadvantageous in terms of cost.

  In addition, since the space formed by fitting the joints is one chamber, if the distance between adjacent steel pipe sheet piles is increased, even if the adhesion between the steel and the mortar is large, the mortar itself will now shear and break. It becomes easy.

  Once a shear deviation occurs due to such a fracture, the shear strength of the joint connecting portion thereafter decreases rapidly. That is, the behavior is as shown in FIG. In order to avoid such a phenomenon, the distance between adjacent steel pipe sheet piles cannot be made too long. Therefore, the construction number of steel pipe sheet piles increases and the construction cost increases.

Japanese Patent Publication No.49-22404 JP 2000-220135 A JP 2006-161375 A JP 2005-282174 A Takeshi Katayama and three others, "Experimental study of high strength joints on steel pipe sheet pile foundations", 3rd Annual Meeting of the Japan Society of Civil Engineers, Vol. 49, September 1994, pages 1018-1019

  The present invention solves the problems of the conventional connecting structure of steel pipe sheet piles as described above, and has a high shear strength in the pipe axis direction while further removing and washing the earth and sand in the joint fitting space. It aims at providing the connection structure of the steel pipe sheet pile and the steel pipe sheet pile which can perform the operation | work which fills up efficiently.

The invention which concerns on Claim 1 of this application is a steel pipe sheet pile provided with the coupling attached to the side part of the steel pipe sheet pile main pipe in the pipe-axis direction, Comprising: The said coupling and the 1st coupling member which comprises an asymmetric coupling, It consists of a 2nd joint member, and said 1st joint member is L shape, Comprising: The tip part of the other side of L type is a steel pipe sheet pile so that one side of L type may counter a steel pipe sheet pile main pipe The main body of the second joint member attached to the main pipe has a linear shape, and is opposed to the other side of the first joint member at a predetermined interval. attached to the steel pipe sheet pile mains so as to form a slit for fitting engagement between the previous end of the L-shaped side facing the steel sheet pile mains member, steel sheet pile mains the first joint member On the outer surface of one side of the L-shape facing with the steel pipe sheet pile main surface facing the one side of the L-shape, It is characterized in that the electromotive and / or irregularities are provided.

The steel pipe sheet pile of the present invention is a combination of an L-shaped first joint member and a linear joint- shaped second joint member that forms a joint fitting slit between the first joint member, When steel pipe sheet piles are connected together, a space of two or more chambers is formed. However, since the two chambers have a structure that makes it easy to obtain a relatively large space facing the steel pipe sheet pile main pipe, removal and washing of soil and sand inside the space is possible. Easy to do.

  In addition, since the two chambers have opposing protrusions and / or irregularities, good adhesion between the steel material and the mortar is ensured, and even if the distance between the steel pipe sheet piles is large to some extent, the mortar itself is unlikely to break. Moreover, since the distance between steel pipe sheet piles can be taken large, the number of constructions of steel pipe sheet piles can be reduced.

  Furthermore, since the space of two or more rooms is formed, the water stop effect is also great. Moreover, in this invention, since the protrusion is provided also in the outer surface of the steel pipe sheet pile main pipe, the shear strength is shared by the steel pipe sheet pile main pipe. Therefore, the shear force applied to the welded portion between the steel pipe sheet pile main pipe and the joint member is reduced, leading to reduction in processing costs such as shortening of the welding length, omission of the reinforcing member, omission of correction of welding distortion, and the like.

  According to a second aspect of the present invention, in the steel pipe sheet pile according to the first aspect, the protrusions or irregularities are formed by studs.

  As will be described later, the stud has a relatively small amount of heat input at the time of forming the protrusion, has a small thermal strain at the welded portion, and can suppress the manufacturing cost (strain correction).

  In addition, the stud has a relatively small amount of protrusion into the fitting space, and it is unlikely to become an obstacle when removing and washing the earth and sand inside the space, allowing mortar to be filled in a sufficiently washed state and increasing the shear strength. It can be demonstrated reliably. Moreover, complicated processing is not required, and production is easy and economical.

  According to a third aspect of the present invention, in the steel pipe sheet pile according to the first aspect, the protrusions or irregularities are formed of a deformed steel bar.

  By welding the deformed steel bar, in addition to increasing the adhesion area with the filler, it is possible to prevent the sliding of the filler by utilizing the wedge action due to the protruding pattern of the deformed steel bar, and to improve the shear strength Can do.

  According to a fourth aspect of the present invention, in the steel pipe sheet pile according to the first aspect, among the protrusions or irregularities, the irregularities of the L-shaped member are formed by through holes.

  The unevenness for adhesion to the mortar is not limited to the protrusion but may be a through hole. In that case, there are advantages that the joint is cleaned and welding is unnecessary.

Claim 5 is the steel pipe sheet pile according to claim 1-4, the distal end of said body portion of said second coupling member, extending inwardly of the slit for the joint fitting, upon coupling of the steel pipe sheet piles with each other, A stopper part having a function of preventing a narrowing of the positioning function and the interval in the steel pipe sheet pile connection direction is provided, which interferes with the first joint member of the opposite steel pipe sheet pile to be connected. .

  By providing a stopper part extending inside the slit, when connecting the steel pipe sheet piles, the stopper part reliably interferes with the second joint member of the mating steel pipe sheet pile, and the steel pipe sheet pile connection direction is Demonstrates the function and the function to prevent the interval from narrowing.

Claim 6 is a steel pipe sheet pile according to any one of claims 1 to 5 , and extends to the distal end portion of the main body portion of the second joint member in the steel pipe sheet pile connection direction to connect the steel pipe sheet piles to each other. A stopper portion having a positioning function and a stopper function is provided in a direction perpendicular to the steel pipe sheet pile connection direction, which interferes with the outer surface of the other one side of the first joint member of the steel pipe sheet pile. Features.

Stopper portion extending in the steel pipe sheet pile coupling direction, against the side surface of the first joint member of L-shaped, exhibits positioning a stopper function in a direction perpendicular to the steel pipe sheet pile coupling direction.

Further, if the extension of the stopper portion is made large, the positioning function and the function of preventing the distance from narrowing in the steel pipe sheet pile connection direction with respect to the steel pipe sheet pile main pipe of the mating steel pipe sheet pile to be connected are exhibited.
Claim 7 is a steel pipe sheet pile according to any one of claims 1 to 5, wherein when the steel pipe sheet piles are connected to each other at the distal end portion of the main body portion of the second joint member, the steel pipe sheet piles are connected to each other. When the interval is reduced, the outer surface of the other steel pipe sheet pile is interfered, and a stopper portion having a function of positioning the other steel pipe sheet pile with respect to the outer surface of the main pipe sheet pile and a stopper function is provided.

Furthermore, the steel pipe sheet piles according to claims 6 and 7 can be used together with the stopper portion of claim 5 to obtain both the steel pipe sheet pile connection direction and the function of the stopper in both directions perpendicular to each other.

  The invention according to claim 8 of the present application is a steel pipe sheet pile connection structure in which the steel pipe sheet piles according to any one of claims 1 to 7 are connected via the joint, and the joints of the steel pipe sheet piles are connected to each other. Out of the space formed by fitting, the outer surface of the first joint member of at least one steel pipe sheet pile and the outer surface of the steel pipe sheet pile main body provided with the projections and / or irregularities of the other steel pipe sheet pile opposite thereto. The space facing each other is filled with a filler.

  The invention according to claim 8 corresponds to a state in which the steel pipe sheet piles of claims 1 to 7 are connected to each other, and the above-described actions and effects are obtained.

The above-mentioned claims 5 to 7 are mainly the case where the stopper portion is added to the second joint member, but depending on the positional relationship between the first joint member and the second joint member, the stopper portion is separately provided. Even if it is not added, the distal end portion of the second joint member interferes with the first joint member, thereby exhibiting a stopper and positioning function.

  According to the steel pipe sheet pile connection structure of the present invention, it is possible to efficiently remove and clean the earth and sand in the joint fitting space and to fill the filler, and to have a high shear strength in the pipe axis direction. .

  Moreover, since the distance between steel pipe sheet piles can be taken large, the number of constructions of steel pipe sheet piles can be reduced. Furthermore, the water stop effect is great.

  FIG. 1 shows an embodiment of a steel pipe sheet pile connection structure according to the present invention. FIG. 2 shows a steel pipe sheet pile on one side taken out from FIG. 1 and shows an embodiment of the steel pipe sheet pile of the present invention.

  The steel pipe sheet pile includes a pair of joint members attached to the steel pipe sheet pile main pipe 10, that is, a joint including a first joint member 11 and a second joint member 12.

  The first joint member 11 is L-shaped, and the tip of the other side 11a of the L-shape is attached to the steel pipe sheet pile main pipe 10 so that one side 11b faces the outer surface of the steel pipe sheet pile main pipe 10. A slit 13 is formed between the second joint member 12 and the second joint member 12.

  By fitting such joints of adjacent steel pipe sheet piles, three spaces of A to C chambers are formed as shown in FIG. At this time, in the A chamber and the C chamber, protrusions 14 and 15 and / or irregularities are formed on the opposing surfaces of the first joint member 11 and the steel pipe sheet pile main pipe 10, respectively.

  The protrusions 14 and 15 and / or irregularities serve as a stopper for a filler such as mortar filled in the A chamber and the C chamber. Thereby, the favorable adhesion state of the steel material and mortar mentioned above is ensured in each surface of at least two chambers of the A chamber and the C chamber.

  By adopting such a structure, the following effects can be obtained.

  The A room and the C room are easy to obtain a wider space than the B room. Therefore, it is easy to remove and clean the earth and sand inside the space.

  In addition, two chambers are formed in the connecting direction of the steel pipe sheet piles, and a good adhesion between the steel material and the mortar is ensured in each chamber (each surface). It is hard to break down. That is, since the distance between the steel pipe sheet piles can be increased, the number of constructions of the steel pipe sheet piles can be reduced.

  Furthermore, since two or more chambers are formed, the water stop effect is greater than the one-chamber structure shown in FIG. 19 corresponding to Patent Document 4 described above.

  Further, in comparison with the PP type joint, in the PP type joint, the shear force is transmitted to the steel pipe sheet pile main pipe through the welded portion between the steel pipe sheet pile main pipe and the joint member. Since the projection 14 is also provided on the outer surface of the steel pipe sheet pile main pipe 10, the shearing force that is handled is directly shared by the steel pipe sheet pile main pipe 10. Therefore, since the shearing force applied to the welded portion between the steel pipe sheet pile main pipe 10 and the joint members 11 and 12 becomes small, the welding length is shortened or the reinforcing member as in Patent Document 2 is omitted (or correction of welding distortion by these is omitted). ) And other processing costs can be reduced.

  The example of the protrusions 14 and 15 provided in the 1st coupling member 11 and the steel pipe sheet pile main pipe 10 or an unevenness | corrugation is shown in FIGS.

  FIGS. 3A and 3B are examples in which protrusions are provided by the studs 14a and 15a. With this structure, the amount of heat input at the time of projection molding is small, the thermal strain of the joint is small, and the manufacturing cost (strain correction) can be suppressed.

  The studs 14a and 15a have a small amount of protrusion protruding into the joint fitting space, and do not become an obstacle when cleaning the joint. In addition, since complicated processing is unnecessary, and after welding the joint to the steel pipe sheet pile main pipe 10, it may be possible to form a projection by the studs 14a and 15a while the steel pipe sheet pile is installed horizontally, Manufacturing cost can be reduced.

  Furthermore, not only the axial shearing force but also resistance against horizontal opening and twisting of the joint member 11 can be exhibited. Therefore, the joint member is hardly deformed, and the effect of restraining the filler is exhibited, which leads to securing the shear strength. As a preferred embodiment, studs 14a and 15a having a height H of about 4 to 10 mm and a diameter (width) φ of about 10 to 20 mm are used. There is no restriction on the arrangement, such as a row arrangement or a staggered arrangement.

  4 (a) and 4 (b) are examples in which irregular shaped steel bars 14b and 15b are welded to form protrusions. By welding the deformed steel bars 14b and 15b, in addition to increasing the adhesion area with the filler, slippage of the filler can be prevented by utilizing the wedge action due to the protruding pattern of the deformed steel bars 14b and 15b. Shear strength can be improved.

  Further, as in the case of the studs 14a and 15a, not only the axial direction shearing force but also resistance against horizontal opening and twisting of the joint member 11 can be exhibited. Therefore, since the joint member 11 is hardly deformed and the restraining effect of the filler is exhibited, the shear strength is secured. The deformed steel bars 14b and 15b are preferably those having a diameter of about 25 mm or less in consideration of the extent that they do not hinder the joint cleaning.

  Further, as shown in FIGS. 5A and 5B, the first joint member 11 may be provided with through holes 16 to form irregularities. Since it is possible to clean other chambers from a certain chamber at the time of cleaning the joint through the through hole 16, reliable cleaning can be expected and work efficiency is improved. Further, as shown in FIGS. 5A and 5B, a plurality of means may be provided with protrusions and / or irregularities.

For example, mortar is filled in the A and C chambers, which are responsible for shear strength. This mortar is preferably a high strength mortar having a compressive strength of 40 N / mm ² or more. On the other hand, the chamber B does not have to be filled with a filler, but it is practically preferable to fill with some kind of filler from the viewpoint of water blocking.

  In this case, it may be filled with the same high strength mortar as in the A and C chambers, but by filling the filler with lower strength and fluidity, the construction efficiency is increased and the construction cost is reduced. It is also possible. You may fill with a commercially available water stop material for the purpose of water stop.

  In the connection structure of FIG. 1 and the steel pipe sheet pile of FIG. 2, the second joint member 12 includes a stopper portion 12b. Therefore, the erection accuracy in the sheet pile connection direction (left and right direction in FIG. 1) is improved. Thereby, the area of the A room and the C room can be sufficiently secured, and as a result, the cleaning of the A room and the C room becomes easy.

The stopper portion 12b may be provided over the entire length of the second joint member 12 (in the axial direction of the steel pipe sheet pile) or may be partly (particularly about 1 m on the upper end side during construction). In order to suppress leakage, it is preferable to extend over the entire length. As the second joint member 12, for example, a shape having a structure corresponding to the stopper portion 12 b at the distal end portion of the linear body portion , such as L-shaped steel, may be used.

  In addition to FIGS. 1 and 2, structures such as FIGS. 6 and 7 can be cited as connection structures that ensure the accuracy of the sheet pile connection direction. When the sheet pile interval decreases, in FIG. 6, the side where the tip of the second joint member 12 (flat plate) of one steel pipe sheet pile faces the steel pipe sheet pile main pipe 10 of the first joint member 11 of the other steel pipe sheet pile. In FIG. 7, the stopper portion 12c provided at the tip of the second joint member 12 (flat plate shape) of one steel pipe sheet pile interferes with the outer surface of the steel pipe sheet pile main pipe 10 of the other steel pipe sheet pile. Structure.

  Moreover, in FIG. 7, since the above-mentioned stopper part 12c is provided, the accuracy of erection in the sheet pile connection direction (left-right direction in the figure) and the vertical direction (up-down direction in the figure) is also improved. Thereby, the surface (outer surface) provided with the protrusion of one side 11a of the first joint member 11 of one steel pipe sheet pile and the surface (outer surface) provided with the protrusion of the steel pipe sheet pile main tube 10 of the other steel pipe sheet pile are accurately opposed. To do.

Further, in the embodiment of FIG. 8, since the stopper portions 12b and 12d are provided in two directions orthogonal to the front end of the body portion of the second joint member 12 having a linear shape , the sheet pile connection direction (the left-right direction in FIG. 8) and The installation accuracy in the vertical direction (vertical direction in the figure) is improved. Accordingly, as in the case of FIG. 7, the surface (outer surface) provided with a protrusion on one side 11a of the first joint member 11 of one steel pipe sheet pile and the surface provided with a protrusion of the steel pipe sheet pile main pipe 10 of the other steel pipe sheet pile ( (External surface) with high accuracy.
The stopper portions 12b and 12d may be provided over the entire length of the second joint member 12 or may be provided in a part thereof, but may be about 1 m from the side that becomes the upper end at the time of construction in terms of improving the building accuracy.

As the 1st coupling member 11 and the 2nd coupling member 12, it is good to use the material of a high intensity | strength. In addition, the size of the steel pipe sheet pile main pipe 10 is an effective combination of excavation and cleaning work of soil in the joint fitting space, filling work, etc. Should be selected.
Furthermore, the effect of the present invention will be described based on experimental results. Note that the following experiment is an experiment focusing only on the joint portion and is not strictly an example of the present invention. However, for convenience, an example for explaining the joint connecting portion according to the present invention is an example of the present invention. An example for explaining a joint portion according to the prior art is a conventional example.

  The relationship between the shear strength at the joint connecting portion and the amount of relative displacement was compared between the example of the present invention and the conventional example by a punching shear experiment using the apparatus shown in FIG.

  The structures of the examples of the present invention and the comparative examples are as follows.

  Example of the present invention (see FIG. 9): H-shaped steel (corresponding to the steel pipe sheet pile main pipe in the present invention), L-shaped steel (thickness 12 mm, length 150 mm) as the first joint member 11 and the second joint member 12 / 90 mm). Before attaching them, six square steel members (6 mm × 6 mm, length 90 mm) were welded to the first joint member 11 and the flange of the H-shaped steel at intervals of 90 mm in the height direction.

A pair of such steel materials was fitted, and the three chambers formed by the fitting were filled with high-strength mortar (compressive strength 52.6 N / mm ² ) to form a connecting portion.

  Comparative example (refer FIG. 10): Using the steel plate with a stripe, it was set as the steel pipe with an inner surface stripe (outer diameter (phi) 165.2mm, plate | board thickness 11mm) provided with a slit, and a pair of this steel pipe was fitted. The three spaces formed were filled with high-strength mortar similar to the example of the present invention to form a connecting portion.

  The results are shown in FIG. The example of the present invention showed higher shear strength than the PP type joint using the internally striped steel pipe as a comparative example.

  FIG. 13 shows the experimental results corresponding to the connecting portion structure of Patent Document 4 (see FIG. 19). Compared with that, the range in which the proof strength level is maintained after reaching the maximum proof strength is long. The decline in yield strength was also gradual.

It is a horizontal sectional view showing one embodiment of the connection structure of the steel pipe sheet pile of the present invention. It is a horizontal sectional view showing one embodiment (corresponding to FIG. 1) of the steel pipe sheet pile of the present invention. It is. An embodiment in the case where protrusions or irregularities are formed by studs is shown, (a) is an elevation view on the steel pipe sheet pile main pipe side, and (b) is an elevation view on the second joint member side. FIG. 2 shows an embodiment in which protrusions or irregularities are formed of deformed steel bars, (a) is an elevation view on the steel pipe sheet pile main pipe side, and (b) is an elevation view on the second joint member side. . The embodiment in which the unevenness on the second joint member side is formed by a through hole is shown. (A) is an elevation view when combined with a stud, and (b) is when combined with a deformed steel bar. FIG. It is a horizontal sectional view which shows other embodiment of the connection structure of the steel pipe sheet pile of this invention. It is a plane sectional view at the time of providing a stopper part in the tip part of the 2nd joint member as other embodiments of the connection structure of the steel pipe sheet pile of the present invention. It is a plane sectional view showing other embodiments at the time of providing a stopper part in the tip part of the 2nd joint member. FIG. 2 shows a test body for measuring the relationship between the shear strength and the amount of relative displacement for the example of the present invention, where (a) is a plan view and (b) is an elevation view. As a comparative example, it is a top view which shows the test body for measuring the relationship between a shear strength and a relative deviation | shift amount about the attachment of the joint structure using an internally protruded steel pipe. FIG. 2 shows an apparatus for measuring the relationship between shear strength and relative displacement, where (a) is a plan view and (b) is a side view. It is the graph which compared the test result about this invention example and the comparative example. It is a graph which shows the relationship between the shear strength about the case of patent document 4, and a relative deviation | shift amount. It is a perspective view which shows an example of the conventional general steel pipe sheet pile foundation. It is sectional drawing which shows the example of a conventional general PP joint. It is sectional drawing which shows the joint structure of patent document 1. (a) is a joint structure of Non-Patent Document 1, and (b) is a cross-sectional view showing the joint structure of Patent Document 2. It is sectional drawing which shows the joint structure of patent document 3. It is sectional drawing which shows the joint structure of patent document 4.

Explanation of symbols

10 ... Steel pipe sheet pile main,
11 ... 1st joint member, 11a ... other side (welding the front-end | tip part to a steel pipe sheet pile main pipe), 11b ... one side (opposing the outer surface of a steel pipe sheet pile main pipe),
12 ... 2nd joint member, 12b, 12c, 12d ... stopper part,
13 ... Slit,
14, 15 ... projection, 14a, 15a ... stud, 14b, 15ba ... deformed steel bar, 16 ... through hole

Claims (8)

A steel pipe sheet pile comprising a joint attached to the side portion of the steel pipe sheet pile main pipe in the axial direction, wherein the joint comprises a first joint member and a second joint member constituting an asymmetric joint ,
The first joint member is L-shaped, and the tip of the other side of the L shape is attached to the steel pipe sheet pile main so that one side of the L shape faces the steel pipe sheet pile main pipe,
The main body portion of the second joint member has a linear shape, and faces the other side of the first joint member at a predetermined interval, and the steel pipe sheet pile main pipe of the first joint member. attached to the steel pipe sheet pile mains so as to form a slit for fitting engagement between the previous end of the L-shaped side facing the,
The outer surface of one side of the L shape facing the steel pipe sheet pile main pipe of the first joint member and the outer surface of the steel pipe sheet pile main pipe facing the one side of the L shape are provided with protrusions and / or irregularities. Features a steel pipe sheet pile.   The steel pipe sheet pile according to claim 1, wherein the protrusions or irregularities are formed by studs.   The steel pipe sheet pile according to claim 1, wherein the protrusions or irregularities are formed of deformed steel bars.   The steel pipe sheet pile according to claim 1, wherein among the protrusions or irregularities, the irregularities of the L-shaped member are formed by through holes. When connecting the steel pipe sheet piles to the front end of the main body portion of the second joint member , the steel pipe sheet piles interfere with the first joint member. The steel pipe sheet pile according to any one of claims 1 to 4 , wherein a stopper portion having a positioning function and a function of preventing a gap from being narrowed is provided in the steel pipe sheet pile connection direction . When connecting the steel pipe sheet piles to the tip of the main body portion of the second joint member in the steel pipe sheet pile connection direction, the other one side of the first joint member of the other steel pipe sheet pile to be connected is connected. The steel pipe sheet pile according to any one of claims 1 to 5 , wherein a stopper portion having a positioning function and a stopper function is provided in a direction perpendicular to the steel pipe sheet pile connection direction that interferes with the outer surface. . When connecting the steel pipe sheet piles to the distal end of the main body portion of the second joint member in the steel pipe sheet pile connection direction, when the interval between the steel pipe sheet piles becomes small, the other pipe pipe sheet pile interferes with the other, The steel pipe sheet pile according to any one of claims 1 to 5, wherein a stopper portion having a function of positioning the steel pipe sheet pile with respect to the outer surface of the main pipe sheet pile and a stopper function is provided.   The steel pipe sheet piles according to any one of claims 1 to 7 are connected structures of the steel pipe sheet piles connected via the joint, and are formed by fitting the joints of the steel pipe sheet piles. Among these, in the space where the outer surface of the first joint member of at least one steel pipe sheet pile and the outer surface of the steel pipe sheet pile main body provided with the projections and / or irregularities of the other steel pipe sheet pile facing this, A steel pipe sheet pile connection structure characterized by being filled with a filler.

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