JP5421750B2 - Steel pipe sheet pile structure and its construction method - Google Patents

Description

  The present invention relates to a steel pipe sheet pile structure and a construction method thereof, and more specifically, by fitting one female joint and the other male joint in a pair of steel pipe sheet pile main pipes placed adjacent to each other. It is related with the construction method of the steel pipe sheet pile structure comprised by connecting steel pipe sheet pile main pipes, and the said steel pipe sheet pile structure.

Conventionally, as a joint structure of steel pipe sheet piles, a circular joint steel pipe having a slit is fixed to each of adjacent steel pipe sheet piles, and steel pipe sheet piles are continuously built in the ground while fitting these joint steel pipes, A joint structure is generally used in which mortar is filled in a joint steel pipe and the steel pipe sheet piles are connected to each other after excavating and cleaning the earth and sand in the joint steel pipe. Such a joint structure is called a P (pipe) -P (pipe) joint (PP joint) because joint steel pipes (P: pipes) are fitted to each other.
Moreover, as a joint structure of a steel pipe sheet pile in addition to the PP joint, a pipe pipe sheet pile is connected by fitting a joint steel pipe having a slit in the axial direction and a T-shaped male joint made of T-shaped steel to each other. L-T which connects a steel pipe sheet pile by fitting a T joint, a female joint made of a pair of L-shaped steels installed in parallel and spaced apart from each other, and a male joint made of one T-shaped steel. A joint or the like may be used.

The conventional joint structure as described above has the following disadvantages.
First, in the case of a PP joint, since three spaces are formed in the fitting joint portion in which the joints are fitted to each other, soil excavation and cleaning are performed in each space of the narrow joint portion after fitting the joint. It is necessary to carry out each work such as mortar filling. For this reason, it is difficult to perform reliable cleaning and solid mortar filling of the joint part, and the quality may become unstable. There is a possibility that the shear strength cannot be exhibited reliably.
Also, in the PT joint and the LT joint, as in the case of the PP joint, since the joint fitting space is narrow, the joint portion is reliably cleaned and filled with a solid mortar. This is difficult and the quality may become unstable, so that the shear strength of the joint portion may not be exhibited reliably. Furthermore, in PT joints and LT joints, when a horizontal force acts on a steel pipe sheet pile due to an earthquake, earth pressure, water pressure, etc., the shearing force generated between the steel pipe sheet piles is transmitted to the joint part, and the joints are relatively By shifting, a relative displacement occurs between the mortar and the joint, and the mortar expands. As a result, the joint steel pipe and the female joint made of L-shaped steel are deformed in the opening direction. There is also a disadvantage that the adhesion between the steel and the mortar is reduced, and the shear strength of the joint is further reduced.

As a joint structure that eliminates the disadvantages of the conventional joint structure as described above and improves the workability related to excavation, cleaning, and mortar filling of the joint portion, a pair of L-shaped steel members are disposed inward. An LL joint has been proposed in which a female joint and a male joint in which arm portions of a pair of L-shaped steel members are disposed outward are fitted to each other (see Patent Document 1).
In the LL joint described in Patent Document 1, a plurality of bar-like steel materials with protrusions are fixed at a predetermined interval to the outer peripheral surface of the main pipe sandwiched between the L-shaped steel materials in the female joint and the male joint. It is possible to reliably exhibit the adhesion strength. And because it has enough space for soil excavation and cleaning in mating joints and filling work of cement-based room temperature curable materials (fillers) such as mortar, the excavation of earth and sand in mating joints is ensured. In addition, the fitting joint can be reliably cleaned, and the filling material can be filled into the fitting joint in a solid manner. Therefore, in the joint structure described in Patent Document 1, the workability is dramatically improved and the quality is stable, and the sticking to the filler is ensured by the rod-shaped steel material on the outer peripheral surface of the steel pipe sheet pile main pipe. Since the shear strength of the part can be improved, it is possible to reduce the construction cost and the construction period by reducing the number of steel pipes and the steel pipe sheet thickness by improving the stability of the entire foundation. .

JP 2005-282174 A

By the way, in the joint structure as described in Patent Document 1, when attaching the joint to the steel pipe sheet pile main pipe in the manufacturing process of the LL joint, the L-shaped steel material is welded along the longitudinal direction of the main pipe. The main pipe may be deformed from a perfect circle into, for example, a diamond shape due to the influence of heat during welding. Furthermore, L-L fittings, since where the male joint and the female joint in steel sheet pile mains is fixed by welding to the asymmetrical position with each other, there is a high possibility that the pipe is deformed asymmetrical cross-sectional shape, When a force is evenly applied from the inside by using a jack or the like to correct a circle, an advanced correction procedure or a large correction device is required, which causes a reduction in the manufacturing efficiency of the steel pipe sheet pile.
Furthermore, when the steel pipe sheet pile is built in the ground in the construction of the steel pipe sheet pile, the female joint and the male joint are increased by increasing the earth pressure of the part surrounded and restrained by the L-shaped steel material. May be deformed so that each L-shaped steel material opens outwardly away from each other. In this way, when each L-shaped steel material of the male joint is opened and deformed, when another steel pipe sheet pile is driven while the female joint is fitted later, the deformed male joint is not deformed. Since the female joints are fitted together, the L-shaped steel materials compete with each other and receive a large driving resistance, which increases the labor and the construction cost.

  An object of the present invention is to provide a steel pipe sheet pile structure and a construction method thereof capable of easily and surely washing joint spaces and filling mortar and concrete, improving the production efficiency of steel pipe sheet piles, and improving the construction efficiency. There is to do.

The steel pipe sheet pile structure of the present invention is a steel pipe sheet pile structure configured to include a plurality of steel pipe sheet piles that are penetrated into the ground while fitting joints of adjacent steel pipe sheet piles, and a pair of adjacent steel pipe sheet piles. One of the steel pipe sheet piles is a female pipe sheet pile having a steel pipe sheet pile main pipe and a pair of female joints provided at two locations on the outer surface of the steel pipe sheet pile main pipe, and the female joint is the steel pipe sheet pile main pipe. A pair of female L-shaped steel materials that are fixed inwardly to the outer surface of the steel pipe sheet piles and that are bent inwardly from the tips of the leg portions, and are welded simultaneously to the outer surface of the steel pipe sheet pile main pipe . The outer surface of the steel pipe sheet pile main body between the pair of female L-shaped steel members in the two outer surface positions of the female steel pipe sheet pile is formed on the outer surface of the steel pipe sheet pile main body by performing welding twice. The steel pipe sheet pile main pipe is uneven. Is fixed by being simultaneously welded to the outer surface two places, the other steel pipe sheet pile adjacent male having a steel sheet pile mains, and a pair of male joint provided on the outer surface two places of the steel pipe sheet piles mains A steel pipe sheet pile, wherein the male joint is disposed outwardly with arms fixed to the outer surface of the steel pipe sheet pile main body and arms that are bent from the ends of the leg parts are separated from each other. A pair of male L-shaped steel materials welded simultaneously to the outer surface of the pipe are welded twice at two locations on the outer surface of the steel pipe sheet pile main pipe, and the female steel pipe sheet pile and the male steel pipe sheet pile are the female die. It is connected by fitting the joint and the male joint.

According to this invention, the two joints provided on the outer periphery of one steel pipe sheet pile main pipe are only one of a male joint and a female joint, and the steel pipe sheet pile including such a joint is the center of the joint. Therefore, the deformation of the steel pipe sheet pile main pipe that occurs when welding the joints will occur substantially symmetrically. Because of this symmetrical deformation, when correcting the steel pipe sheet pile main to its original perfect circle after welding, set a jig such as a jack at the symmetrical position inside or outside the steel pipe sheet pile main pipe and correct it. Therefore, it is possible to eliminate the need for sophisticated straightening procedures and large straightening devices, thereby improving the manufacturing efficiency of the steel pipe sheet pile.
Furthermore, for example, when constructing a steel pipe sheet pile, a pair of steel pipe sheet piles having a female joint is placed in advance, and a steel pipe sheet pile having a male joint is placed between these steel pipe sheet piles, Since the male joint that is not deformed is fitted in the space of the female joint that has been deformed so as to open to the outside due to earth pressure, it is possible to fit each other's joints satisfactorily without causing competition. Construction efficiency can be improved.

At this time, the steel sheet pile structure of the present invention, wherein the said steel pipe sheet pile main outer surface of the pair of female L-shaped steel of the female joint on the outer surface two places female steel sheet piles, steel plate having an uneven surface Since ( for example, a checker plate etc.) is provided, adhesion with a filler can be improved and the shear strength of a joint part can be improved. In addition, although the steel plate which has an unevenness | corrugation may be provided between the male L-type steel materials in a male steel pipe sheet pile, the steel plate with a larger width dimension is provided between the female L-type steel materials than between the male L-type steel materials. This is advantageous in terms of improving the shear strength. Furthermore, if it is such a structure, since it becomes possible to reduce a required number of welding compared with attaching the rebar over several strips for the shear strength improvement like the said patent document 1, manufacturing is possible. In addition to the reduction in time and labor, deformation due to welding heat is reduced, so that labor during correction can also be reduced.
In the steel pipe sheet pile structure of the present invention, in the male pipe sheet pile, a pair of male L-shaped steel materials each serving as a male joint are welded simultaneously to the two outer surfaces of the steel pipe sheet pile main pipe. However, the pair of male joints is configured by performing welding twice on the two outer surfaces of the steel pipe sheet pile main pipe. That is, manufacture is performed by two weldings in which a pair of male L-shaped steel materials are welded simultaneously on one and the other of the pair of male joints.
Moreover, in the female steel pipe sheet pile, steel plates having irregularities on the surface are simultaneously welded at two locations on the outer surface of the steel pipe sheet pile main pipe, and a pair of female L-shaped steel materials that respectively become female joints are welded simultaneously on both sides thereof. However, a pair of female type | mold joints are comprised by welding twice to two outer surfaces of a steel pipe sheet pile main pipe. That is, a total of three times of one welding for simultaneously welding a pair of uneven steel plates and two weldings for simultaneously welding a pair of female L-shaped steel materials on one and the other of the pair of female joints. Manufacture is performed by welding.

Moreover, in the steel pipe sheet pile structure of this invention, it is preferable that the unevenness | corrugation is provided in the surface of the said male L-shaped steel material.
According to such a configuration, the male L-shaped steel material is formed of a striped steel plate having striped protrusions (unevenness) on the surface where the pair of leg portions face each other, and an arm portion obtained by bending the striped steel plate. By adopting a configuration in which striped projections are also formed on the outer surface of the metal, adhesion to the filler can be enhanced and the shear strength of the joint can be further improved.

The construction method of the steel pipe sheet pile structure of the present invention is a construction method of any one of the above steel pipe sheet pile structures, and after placing at least a pair of female steel pipe sheet piles at positions separated from each other by a predetermined interval, Between the female steel pipe sheet piles, the male steel pipe sheet pile is driven while fitting the male joint of the male steel pipe sheet pile to the female joint of the female steel pipe sheet pile.
According to the present invention, as described above, since the male steel pipe sheet pile is driven while the male joint is fitted to the female joint of the female pipe sheet pile previously set, the joints may compete with each other. Can be fitted well and the construction efficiency can be improved.

It is the top view and sectional drawing which show the steel pipe sheet pile structure which concerns on embodiment of this invention. It is sectional drawing which shows the joint structure of the steel pipe sheet pile in a steel pipe sheet pile structure. It is a perspective view which expands and shows the said steel pipe sheet pile. It is a figure which shows the correction process which is one process of the manufacture procedure of a steel pipe sheet pile. It is a figure which shows an example of the construction procedure of a steel pipe sheet pile.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a steel pipe sheet pile foundation 1 as a steel pipe sheet pile structure of the present embodiment is a well foundation supporting a bridge pier provided in the vicinity of a river or a coast, and penetrates into the ground G on the riverbed or the seabed. A plurality of steel pipe sheet piles 2 are arranged side by side in a plane circle, and these steel pipe sheet piles 2 are connected to each other via a joint portion 3. Here, the steel pipe sheet pile 2 on one side (the lower side in FIG. 2) is provided at two locations on the steel pipe sheet pile main pipe 4 (hereinafter simply referred to as the main pipe 4) made of a circular steel pipe and the side face of the main pipe 4. This is a female steel pipe sheet pile 2A having a female joint 5. The other (upper side in FIG. 2) includes a steel pipe sheet pile main pipe 4 (hereinafter simply referred to as a main pipe 4) made of a circular steel pipe and a male joint 6 provided at two positions on the side face of the main pipe 4. It is the male steel pipe sheet pile 2B comprised.

  Of the pair of steel pipe sheet piles 2 placed adjacent to each other, the joint part 3 is fitted with a female joint 5 of one female pipe sheet pile 2A and a male joint 6 of the other male pipe sheet pile 2B. At the same time, the steel pipe sheet piles 2A and 2B are connected to each other by filling the spaces A, B, and C formed by the fitted female joint 5 and male joint 6 with a cement-based room temperature curable filler such as mortar. It is configured as follows.

  The female joint 5 includes a pair of female L-shaped steel members 50 fixed to the outer surface of the main pipe 4 in the female steel pipe sheet pile 2A. The pair of female L-shaped steel members 50 are respectively formed on the outer surface of the main pipe 4. And a leg portion 51 extending outward from the outer surface of the main pipe 4 and an arm portion 52 that is bent at a substantially right angle from the tip of the leg portion 51 and is formed in a substantially L-shaped cross section. The pair of female L-shaped steel members 50 are arranged inwardly such that the tips of the arm portions 52 approach each other, and have an opening 53 that receives the male joint 6 between the tips of these arm portions 52. Has been.

  The male joint 6 includes a pair of male L-shaped steel members 60 fixed to the outer surface of the main pipe 4 in the male steel pipe sheet pile 2B. The pair of male L-shaped steel members 60 are respectively formed on the outer surface of the main pipe 4. And a leg portion 61 that extends outward from the outer surface of the main pipe 4 and an arm portion 62 that is bent at a substantially right angle from the distal end of the leg portion 61 and has a substantially L-shaped cross section. The pair of male L-shaped steel members 60 are arranged outwardly such that the tips of the respective arm portions 62 are separated from each other, and each leg portion 61 is inserted into the opening 53 of the female joint 5. Yes. Moreover, as shown in FIG. 3, the male L-shaped steel material 60 is formed of a striped steel plate having striped protrusions (unevenness) 63 on the surface where the pair of leg portions 61 face each other. Striped protrusions 63 are also formed on the outer surface of the bent arm portion 62.

  A plate 8 is welded and fixed along the longitudinal direction of the main pipe 4 to the outer surface between the leg portions 51 of the female joint 5 in the main pipe 4 of the female steel pipe sheet pile 2A. The plate 8 is composed of a striped steel plate (checker plate) having striped projections (unevenness) on the surface, and is continuously welded and fixed along the longitudinal direction of the main pipe 4.

  In the joint portion 3 described above, the female joint 5 and the male joint 6 are fitted as shown in FIG. 2, so that the leg portions 61 in the male L-shaped steel material 60 and the outer surface of one and the other main pipes 4 are joined. A main filling space A filled with a filler is formed at a position surrounded by. Further, the main filling space A is continuously filled in a position outside the extension line of the leg portion 61 of the male L-shaped steel member 60 (on the protruding side of the arm portion 62) and surrounded by the female L-shaped steel member 50. A sub-filling space filled with the material is formed. The sub-filling space includes the arm portion 62 of the male L-type steel material 60, the outer surface of the main pipe 4 in one steel pipe sheet pile 2A, and the leg portion 51 of the female L-type steel material 50. The second sub-filling space C surrounded by the first sub-filling space B surrounded by the leg portion 61 and the arm portion 62 of the male L-shaped steel material 60 and the leg portion 51 and the arm portion 52 of the female L-type steel material 50. And divided.

Next, the manufacturing process of the steel pipe sheet pile 2 will be described.
FIG. 4 is a diagram showing a correction process, which is a process of manufacturing a steel pipe sheet pile.
In the following, the male steel pipe sheet pile 2B is illustrated and described, and the illustration of the female steel pipe sheet pile 2A is omitted.
First, as a welding process of the male joint 6, two male L-shaped steel materials 60 are simultaneously placed on the main pipe 4, and the male L-shaped steel material 60 is attached to the main pipe 4 in the longitudinal direction of the main pipe 4 using a reduction roll. By pressing on, appropriate portions are temporarily welded while eliminating the gap between the main pipe 4 and the male L-shaped steel material 60. Thereafter, the male joint 6 by the two male L-shaped steel members 60 is fixed to the outer surface of the main tube 4 by robot welding the main tube 4 and the male L-shaped steel member 60 continuously along the longitudinal direction. . Subsequently, a pair of male L-shaped steel members 60 on the opposite side is fixed to the main pipe 4 by the same procedure.
In this way, in one and the other male joint 6, two male L-shaped steel members 60 are welded simultaneously, so that one male steel pipe sheet pile 2B is manufactured by a total of two weldings. Yes.

Similarly, the female steel sheet pile 2A is manufactured by welding two female L-shaped steel members 50 to the main pipe 4 at the same time. However, in the female steel pipe sheet pile 2A, before the female L-shaped steel member 50 is welded. The plate 8 is welded and fixed to the main pipe 4. In this case, the plate 8 is formed by temporarily welding the double-sided plates 8 corresponding to the pair of female joints 5 to the main pipe 4 and then simultaneously welding the double-sided plates 8 at one time. 4 is fixed to the outer surface.
In this way, the female steel sheet pile 2A is welded once with the plate 8 and twice with the pair of female joints 5, and a single female steel pipe sheet pile 2A is manufactured by a total of three times of welding. It has become so.

Next, based on FIG. 4, the correction process of the steel pipe sheet pile 2 is implemented.
As described above, when the male joint 6 is main-welded, the main pipe 4 is deformed by welding heat. Specifically, the bulging portion 41 is formed between the opposing male L-shaped steel members 60, and the bulging portion 41 is also formed between the male joint 6 and the other male joint 6. Furthermore, between the bulging part 41 and the bulging part 41, a degenerate part 42 that enters the inside of the main pipe 4 is formed. As described above, the four bulging portions 41 and the four degenerate portions 42 are formed, whereby the main pipe 4 is deformed into a substantially rhomboid shape in cross section.

As a method for correcting the deformed main pipe 4, a jack or the like is inserted into the main pipe 4 to apply a force from the inside to correct the substantially rhombic cross-sectional shape into a circular cross-section. Specifically, a hydraulic jack 9 that contacts the inside of the main pipe 4 is used, and the tip of the output shaft of the jack 9 is brought into contact with the inner surfaces of a pair of opposing retracting portions 42 and is retracted by the force from the jack 9. The part 42 is pushed outward. Then, while the jack 9 is sequentially moved in the longitudinal direction of the main pipe 4, the inner surface of the contracting portion 42 is sequentially pushed out. Following this, the tip of the output shaft of the jack 9 is brought into contact with the inner surfaces of the other pair of the contraction portions 42 and spreads, while the jacks 9 are sequentially moved in the longitudinal direction of the main tube 4 and the contraction portions 42 are sequentially spread. . The main pipe 4 is corrected to a substantially perfect circle over the entire length by sequentially repeating the pushing and spreading of the contracting portion 42 using the jack 9.
By performing the same correction process on the female steel pipe sheet pile 2A, the main pipe 4 of the female steel pipe sheet pile 2A is also corrected to have a substantially circular cross section.

Next, the construction process of the steel pipe sheet pile 2 will be described with reference to FIG.
First, the female steel pipe sheet piles 2A are driven in advance at positions separated from each other by a predetermined interval. Here, the predetermined interval is appropriately set according to a predetermined dimension in consideration of fitting with the male steel pipe sheet pile 2B to be placed later. Thus, when the female steel pipe sheet pile 2A is driven, the female L-shaped steel members 50 may be deformed so as to open to the outside due to the earth pressure of the earth and sand that has entered the female joint 5.
Next, the male steel pipe sheet pile 2B is driven in the space | interval part of a pair of female steel pipe sheet pile 2A in which driving | running was completed. At this time, the male pipe sheet pile 2B is driven while the male joint 6 is fitted to the female joint 5 opened outward as described above. Although the male L-shaped steel member 60 of the male steel pipe sheet pile 2B is also subjected to earth pressure that opens outward, the female L-shaped steel member 50 of the preceding female steel pipe sheet pile 2A is located on the outer side, The deformation of the male L-shaped steel material 60 is constrained by the L-shaped steel material 50.

According to the above embodiment, the two joints provided on the outer periphery of the steel pipe sheet pile main pipe 4 are only one of the female joint 5 and the male joint 6, and the female pipe sheet pile 2A and the male pipe sheet pile. Since 2B has a symmetrical shape, the deformation of the steel pipe sheet pile main pipe 4 that occurs when welding the joint occurs symmetrically. By deforming symmetrically in this way, when the steel pipe sheet pile main pipe 4 is corrected to the original perfect circle, it can be easily corrected using a simple jig such as the jack 9, and the manufacturing efficiency of the steel pipe sheet pile 2 is improved. Can be improved.
In addition, the two joints provided on the outer periphery of the main pipe 4 are only one of the male joint 6 and the female joint 5, and these joints are fixed at symmetrical positions. Positioning and pushing down are facilitated, and manufacturing efficiency can be further improved.

  Further, the male steel pipe sheet pile 2B is manufactured by a total of two weldings for welding each male joint 6, and the female steel sheet pile 2A is welded once for each plate 8 and twice for welding each female joint 5. Therefore, the number of weldings can be reduced as compared with the case of manufacturing a conventional steel pipe sheet pile. That is, the conventional steel pipe sheet pile is manufactured by welding three times in total, one welding of the plate 8, one welding of the female joint 5 and one welding of the male joint 6 per steel pipe sheet pile. In addition, six weldings are required for two wires. On the other hand, in this embodiment, since the male steel pipe sheet pile 2B and the female steel pipe sheet pile 2A are combined three times, it is possible to produce two pieces by the number of weldings of five times. It can be improved dramatically.

Further, since the plate 8 is provided between the female L-shaped steel members 50 of the female joint 5, the plate 8 having a larger width than that provided between the male L-shaped steel members 60 can be used. And the shear strength can be improved.
Moreover, when constructing this steel pipe sheet pile, a female steel pipe sheet pile 2A having a female joint 5 is driven in advance, and a male steel pipe sheet pile 2B having a male joint 6 is driven between a pair of steel pipe sheet piles 2A. Since the male joint 6 that is not deformed is fitted into the space of the female joint 5 that is deformed so as to open outward by earth pressure, these joints do not compete, and the placement resistance It is possible to improve the construction efficiency by preventing the increase. Further, even if the male joint 6 of the male steel pipe sheet pile 2B to be placed later is to be deformed so as to open outward, the deformation is restrained by the female joint 5, and the male joint 6 and the female joint 5 are Since earth pressure acts in the direction in which the fitting becomes stronger, the connection strength between the steel pipe sheet piles 2A and 2B can be increased.

In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the said embodiment, although the steel pipe sheet pile foundation 1 was illustrated as a steel pipe sheet pile structure, it is not restricted to this, A steel pipe sheet pile structure is used as arbitrary structures, such as a retaining wall, a seawall structure, and a connection wall for underground structures. It can be used, and its use is not particularly limited.
Moreover, in the said embodiment, what provided the female type | mold joint 5 or the male type | mold joint 6 in each two places in each steel pipe sheet pile 2A, 2B was illustrated, but three or more places on the outer surface of one steel pipe sheet pile main pipe | tube. The joint may be provided. In that case, the third joint may be different from the other two joints, that is, the female joint 5 and the male joint 6 are used as the third joint with respect to the female pipe sheet pile 2A. Any joint may be fixed, and any joint of the female joint 5 and the male joint 6 may be fixed as a third joint to the male steel pipe sheet pile 2B.

  Moreover, as a construction procedure of the steel pipe sheet pile 2, after placing three or more female steel pipe sheet piles 2A in advance as in the above-described embodiment, the male pipe sheet piles 2B are sequentially placed between them. It is not limited to what you do. That is, after placing at least a pair (two) of female steel pipe sheet piles 2A, a male steel pipe sheet pile 2B is placed between them, and spaced apart from one female steel pipe sheet pile 2A (the third and later). It is also possible to adopt a procedure of repeatedly performing the procedure of placing the male steel pipe sheet pile 2B in the interval portion after placing the female steel pipe sheet pile 2A.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  DESCRIPTION OF SYMBOLS 1 ... Steel pipe sheet pile foundation (steel pipe sheet pile structure), 2 ... Steel pipe sheet pile, 2A ... Female steel pipe sheet pile, 2B ... Male steel pipe sheet pile, 3 ... Joint part, 4 ... Steel pipe sheet pile main pipe, 5 ... Female joint, 6 ... Male Mold joint, 8 ... Plate (steel plate), 50 ... Female L-shaped steel, 51 ... Leg, 52 ... Arm, 60 ... Male L-shaped steel, 61 ... Leg, 62 ... Arm, 63 ... Projection (unevenness) .

Claims (3)

A steel pipe sheet pile structure comprising a plurality of steel pipe sheet piles penetrating into the ground while fitting joints of adjacent steel pipe sheet piles,
One of the adjacent steel pipe sheet piles is a female pipe sheet pile having a steel pipe sheet pile main pipe and a pair of female joints provided at two locations on the outer surface of the steel pipe sheet pile main pipe. Is a pair of legs that are fixed to the outer surface of the steel pipe sheet pile main pipe and that the arm parts that are bent from the tips of the leg sections are arranged inward toward each other and welded simultaneously to the outer surface of the steel pipe sheet pile main pipe. The female L-shaped steel material is welded twice to the two outer surfaces of the steel pipe sheet pile main pipe, and the steel pipe sheet pile book between the pair of female L-shaped steel materials at the two outer surface positions of the female steel pipe sheet pile. On the outer surface of the pipe, a steel plate having irregularities on the surface is fixed by being welded simultaneously to two outer surfaces of the steel pipe sheet pile main pipe,
The other adjacent steel pipe sheet pile is a male pipe sheet pile having a steel pipe sheet pile main pipe and a pair of male joints provided at two locations on the outer surface of the steel pipe sheet pile main pipe. A pair of male L-shaped steel members, which are fixed to the outer surface of the pipe and that are bent outward from the distal ends of the leg portions, are welded to the outer surface of the steel pipe sheet pile main pipe at the same time. The steel pipe sheet pile main pipe is welded twice to the two outer surfaces ,
A steel pipe sheet pile structure in which the female steel pipe sheet pile and the male steel pipe sheet pile are connected by fitting the female joint and the male joint. In the steel pipe sheet pile structure according to claim 1 ,
A steel pipe sheet pile structure in which irregularities are provided on the surface of the male L-shaped steel material. It is a construction method of the steel pipe sheet pile structure according to claim 1 or 2 ,
At least a pair of female steel pipe sheet piles are placed at positions separated from each other by a predetermined distance, and between these female steel pipe sheet piles, the male joint of the male steel pipe sheet pile is connected to the female joint of the female steel pipe sheet pile. The construction method of the steel pipe sheet pile structure characterized by placing the said male steel pipe sheet pile while making it fit.

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