JP2013019245A - Combination steel sheet pile, underground continuous wall, and method of removing combination steel sheet pile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combination steel sheet pile, an underground continuous wall, and a method of removing the combination steel sheet pile.SOLUTION: In a combination steel sheet pile 1, a flange 22 of an H beam 20 is superimposed and joined on a web 11 on one side of a steel sheet pile 10 which has the web 11 in the center in the width direction and has joints 14 at both ends, and the web 11 of the steel sheet pile 10 and the flange 22 of the H beam 20 are joined by joining means which can be removed from the steel sheet pile side at an upper portion on the ground excavation side opposing to the H beam 20 except the underground lower portion. An underground continuous wall is made using the combination steel sheet pile 1. The joining is released from the ground excavation side after the excavation, and the respective portions are separated and pulled out.

Description

  The present invention mainly relates to a combination steel sheet pile and an underground continuous wall and a combination steel for temporary use, which are widely used as a retaining wall, a wall of an underground structure, a temporary cut-off of a river, etc. for preventing collapse of earth and sand in a civil engineering work. It relates to the method of removing the sheet pile.

  In general, when excavating the ground and constructing a structure underground, the main wall is constructed after excavating with a temporary earth retaining, or a soil cement wall or cast-in-place reinforced concrete wall for temporary and permanent construction. The construction method is the mainstream.

  However, among the construction methods using temporary earth retaining, with concrete walls such as soil cement walls and concrete walls, the temporary earth retaining cannot be removed after the construction of the underground structure, and the effect on subsequent projects becomes a problem.

  Moreover, the steel pile-type temporary earth retaining that can be pulled out includes the parent pile sheet pile method and the steel sheet pile, but when the excavation depth is about 10 m or more, the cross-sectional rigidity is often insufficient and is not applicable. Or an incidental structure such as a tie rod or an anchor is required.

  For such a problem, a steel pipe sheet pile in which a steel pipe with a slit of about 165 mm in diameter is attached as a joint to a steel pipe of about 500 to 2000 mm is used as a large cross-section retaining member applicable to construction with an excavation depth of about 10 m or more. Has been.

  Further, as a wall material used for the underground continuous wall, a combination steel sheet pile in which steel sheet piles and H-section steel are combined, for example, a combination steel sheet pile in which H-section steel is continuously or intermittently welded to a steel sheet pile, is also known. Yes.

  For example, Patent Document 1 discloses a technique of a wall-shaped steel sheet pile obtained by welding and joining a straight steel sheet pile having an asymmetrical left and right joint shape and an H-shaped steel, and a manufacturing method thereof.

  Further, in Patent Document 2, as shown in FIG. 25, a combination steel in which an H-shaped steel 28 is joined to a steel sheet pile 27 having an asymmetrical left and right joint shape using a weld W or a bolt 29 and a nut 30. An underground continuous wall steel 31 made of sheet piles 24 is disclosed.

  Furthermore, Patent Document 3 discloses a technique in which a processing jig is provided on one side of the front and back surfaces of a steel sheet pile so that a shaped steel such as an H-shaped steel can be fitted as a stiffener.

  Moreover, it is formed from a steel sheet pile having a web at the center in the width direction and joints at both ends, and an H-section steel having a flange at the end of the web, and the steel sheet pile web and one of the H-section steels There is also known a technique in which the flanges are combined with each other and joined with a drill screw so as to protrude from the flange of the H-shaped steel to form a combined steel sheet pile (for example, see Patent Document 4).

JP-A-11-140864 JP 2002-212943 A JP 2008-267069 A JP 2008-38490 A

  In the case of the steel pipe sheet pile in the prior art, the steel pipe is often deformed by earth water pressure after use, and thus cannot be reused. Moreover, since the steel pipe sheet pile has a hollow shape, it is bulky in transportation and storage, so that there is a problem that transportation and storage efficiency is poor, and there is also a problem that costs increase in this respect.

  The combination steel sheet pile has a hat-shaped steel sheet pile web and a H-shaped steel flange joined together by fillet welding, resulting in a combined steel sheet pile having a bulky cross-sectional shape such as a Y-shaped cross section as a whole. There is also the problem that storage becomes inefficient. Moreover, even such a combination steel sheet pile has a problem that the construction cost increases because it is used up only once.

  In addition, in the case of construction in the city, a press-in method is often required because noise and vibration must be taken into account, and the overall cross-sectional area and planar outer diameter are larger than conventional U-shaped steel sheet piles. In combination steel sheet piles with a bulky cross-sectional shape such as a mold section, a construction machine with a special gripping device must be used, and the construction cost increases for that construction, or the steel sheet pile does not fit in the gripping device and construction is not possible Therefore, a special large-sized machine with a small number of units is required, and if such a large-sized construction machine is required for both press-fitting construction and pull-out removal, there is a problem that costs increase.

  The combined steel sheet piles described in Patent Documents 1 to 3 have a surface area larger than that of normal steel sheet piles, so the frictional resistance of the ground is increased, and a construction machine that does not pull out after use or requires a large construction machine to be pulled out. There is a problem that.

  In addition, when applied to temporary earth retaining with a depth of excavation of more than 10 m (temporary wall used when excavating the ground and constructing an underground structure), the steel sheet pile becomes longer, so the frictional resistance of the ground increases. There is a problem that the steel sheet pile cannot be pulled out, or that a construction machine requiring a large scale for drawing is required.

  When the combined steel sheet pile 24 having a bulky cross-sectional shape such as a Y-shaped cross section is pulled out as a whole, the claws at both ends of the hat-shaped steel sheet pile 10 and the flanges at both ends of the H-shaped steel 20 as shown in FIG. The closed space 25 is formed in a triangular shape connecting the three intersections of the line segments connecting the tips, and the surrounding ground 26 is dug together with the combined steel sheet pile 24, causing problems such as settlement and inclination.

  When a combined steel sheet pile in which H-shaped steel is joined to one side of the steel sheet pile is inserted into the ground by press-fitting etc., the reverse side of the steel sheet pile opposite to the H-shaped steel is the ground excavation side, but from the H-shaped steel side to the steel sheet pile If it is welded or joined by bolts and nuts from the front and back of the steel sheet pile, and if the steel sheet pile is placed on the excavation side, then the steel sheet pile must be There is a problem that it cannot be separated separately from H-shaped steel.

  When placing steel sheet piles and stiffeners separately on site, separation before drawing is possible, but it is necessary to construct them separately even when building underground continuous walls, resulting in a problem of reduced construction efficiency. . Furthermore, when it is a structure which fixes only the upper end of a combination steel sheet pile, there exists a problem that there exists a possibility that a front-end | tip may open at the time of placement. In order to avoid such a problem, a method of temporarily fixing the tip has also been proposed, but the steel sheet pile and the H-shaped steel cannot be separated, and cannot be separated separately unless after drawing.

  Moreover, as shown in FIG. 24, the temporary earth retaining wall which penetrated into the ground the steel material 31 for underground continuous walls which consists of the non-separable temporary combination steel sheet pile 24 which fixed the H-section steel to the single side | surface of the conventional steel sheet pile 27. Then, after the excavation between the temporary earth retaining walls, for the installation of the formwork when placing the concrete of the underground structure, 1 m as the formwork / working space G between the temporary earth retaining wall 31 and the like. There is a problem that the site cannot be effectively used because a certain degree of separation must be provided.

  In the joining form in which the steel sheet pile and the H-shaped steel are passed through the flange of the H-shaped steel from the steel sheet pile side opposite to the H-shaped steel by the drill screw (drilling tapping screw), and the protruding form, the tip of the protruding drill screw Since the part may collide with a small obstacle such as a stone when it enters the ground and bends, the threaded part of the drill screw is damaged when the ground penetrates and when it is pulled out. In the first place, however, it is not considered that the steel sheet pile and the H-shaped steel are separated and reused, and it is difficult to join the steel sheet pile to match the previous screw hole by using a drill screw. Then, since a new female screw hole is drilled, there is a problem that the previously provided screw hole remains as a damaged portion. Further, since a through hole is provided in the H-shaped steel and the steel sheet pile, a water channel is formed, and there is a problem that the water leaks easily or the drill screw easily rusts.

  Therefore, the present invention is a combined steel sheet pile combining a steel sheet pile and an H-shaped steel, which can be constructed integrally at the time of placing, and the joint between the steel sheet pile and the H-shaped steel can be easily released from the ground excavation side. Method of removing steel sheet pile and H-shaped steel combined steel sheet pile and underground continuous wall and combined steel sheet pile that can be separately separated into steel sheet pile and H-shaped steel at the time of subsequent drawing The purpose is to provide.

  In the combined steel sheet pile of the first invention, the combined steel sheet pile having a web at the center in the width direction and a web of one side of the steel sheet pile having joints at both ends, and an H-shaped steel flange is overlapped and joined. The steel sheet pile web and the H-shaped steel flange are the upper part of the ground cutting side opposite to the H-shaped steel and excluding the lower part located in the ground. Bolts, screws or fillets that are joined with a joining structure having shear resistance only on the surface where the web of the sheet pile and the steel sheet pile contact, and the joining structure does not protrude from the flange side of the H-shaped steel It is a joining structure by any one of welding, and can be removed.

  In the second invention, in the combined steel sheet pile of the first invention, the steel sheet pile has a pair of flanges connected to both ends of the web, an arm connected to the other end of the flange, and a tip of the arm. This is a hat-shaped steel sheet pile with a cross-section with joints in the section. The web of the hat-shaped steel sheet pile is provided with a number of holes or internal thread holes at intervals in the vertical direction, and the flange of the H-shaped steel is vertically A detachable bolt provided with a large number of internally threaded holes at intervals in the direction, inserted into the web hole of the hat-shaped steel sheet pile or screwed into the internally threaded hole of the web, and screwed into the internally threaded hole of the H-shaped steel flange It is characterized by being joined by.

  In the third invention, in the combined steel sheet pile according to the first invention, the steel sheet pile has a pair of flanges connected to both ends of the web, an arm connected to the other end of the flange, and a tip of the arm. A hat-shaped steel sheet pile having a cross-section with a joint at the section, and a plurality of holes are provided in the hat-shaped steel sheet pile web at intervals in the vertical direction. The inner peripheral surface and the flange of the H-shaped steel are joined by fillet welding capable of fusing removal or grinding removal.

  According to a fourth invention, in the combined steel sheet pile of the first invention, the steel sheet pile has a pair of flanges connected to both ends of the web, an arm connected to the other end of the flange, and a tip of the arm. A hat-shaped steel sheet pile having a hat-shaped cross-section with joints in the section, and a number of drills from the hat-shaped steel sheet pile side with the web of the hat-shaped steel sheet pile and the flange of the H-shaped steel spaced apart in the vertical direction It joins with a screw | thread, The front-end | tip of each said drill screw does not protrude from the flange of H-section steel, It is characterized by the above-mentioned.

In the fifth invention, characterized in that in any one of the combination sheet pile of the first invention to the fourth invention, the section modulus of the combination sheet pile has been with 3,500cm ³ / m~14,000cm ³ / m And

  In the underground continuous wall of the sixth invention, a plurality of the combined steel sheet piles of any one of the first invention to the fifth invention are constructed by fitting and fitting the joints to each other. .

  In the method for removing the combined steel sheet pile of the seventh invention, the method for removing the combined steel sheet pile in the underground continuous wall of the sixth invention, wherein the ground on the steel sheet pile side opposite to the H-shaped steel in the underground continuous wall To form an open groove, and after constructing an underground structure on the open groove side, the joint between the steel sheet pile and the H-section steel is released and separated from the space on the open groove side. The steel sheet pile is pulled out separately.

  In the method for removing a part of the combined steel sheet pile of the eighth invention, the method for removing a part of the combined steel sheet pile in the underground continuous wall of the sixth invention, After excavating the ground on the steel sheet pile side to form an open groove, and constructing an underground structure using the steel sheet pile as a formwork, release the joint between the steel sheet pile and the H-shaped steel from the space on the open groove side It separates and only H shape steel is pulled out.

According to the combined steel sheet pile of the first invention, a combined steel sheet pile having a web at the center in the width direction and a web of one side of the steel sheet pile having joints at both ends and being joined by overlapping a flange of an H-shaped steel. The steel sheet pile web and the H-shaped steel flange are the upper part of the ground cutting side opposite to the H-shaped steel and excluding the lower part located in the ground. Bolts, screws or corners that are joined with a joining structure having shear resistance only at the surface where the web of the sheet pile and the steel sheet pile contact, and the joining structure does not protrude to the ground side from the flange part of the H-shaped steel Since it is a joining structure by any of the meat welding and can be removed, the following effects (1) to (7) can be obtained.
(1) Since the joint between the hat-shaped steel sheet pile and the H-shaped steel is released from the cut groove side and the hat-shaped steel sheet pile and the H-shaped steel can be separated, the separation becomes easy. Since the shaped steel can be transported and stored separately, the transportation and storage costs can be reduced compared to the case where the hat-shaped steel sheet pile and the H-shaped steel are integrated.
(2) Using a large and special construction machine, the ground surface resistance of the ground can be reduced by separating the hat-shaped steel sheet pile and H-shaped steel by releasing the joint from the cut groove and separating them separately. Can be easily pulled out and removed using a general-purpose construction machine (conventionally, because it is a combined steel sheet pile in which the welded joint of the hat-shaped steel sheet pile and the H-shaped steel is arranged on the back soil side, It is impossible to separate the hat-shaped steel sheet pile and the H-shaped steel before drawing and it was necessary to use a large construction machine, but this is not necessary in the combined steel sheet pile of the present invention.) Since the circumferential friction depends on the surface area of the combined steel sheet pile to be pulled out, the hat-shaped steel sheet pile alone is about 4 times the combined steel sheet pile by pulling out the hat-shaped steel sheet pile and the H-shaped steel separately. The H-shaped steel can be pulled out with a force of about 60%. Therefore, drawing can be performed with a smaller construction machine than when the combined steel sheet pile is pulled out as a unit, and the construction cost can be reduced. For example, even when performing placement and extraction with a vibro hammer or the like, extraction can be performed with a small construction machine.
(3) It is possible to replace and reuse only the hat-shaped steel sheet pile that is easily worn out, thereby reducing the construction cost. (Conventionally, there is a case in which a single use up causes a complete loss, and in the present invention, it becomes possible to divert H-section steel that occupies about 60 to 70% of the total steel weight.)
(4) In place of the H-section steel in the combined steel sheet pile, it is possible to combine H-section steels of different sizes, and to make rational wall body specifications even in other construction sites that require different cross-sectional rigidity. it can.
(5) Since the hat-shaped steel sheet pile and the H-shaped steel can be pulled out separately, even a combination steel sheet pile having a size that does not fit in the gripping mechanism in the construction machine can be pulled out. At this time, the hat-shaped steel sheet pile on the front side can be gripped to ensure a reaction force, so that the H-shaped steel can be easily pulled out.
(6) Since the joint between the hat-shaped steel sheet pile and the H-shaped steel does not protrude from the H-shaped steel flange to the natural ground side, damage to the joint at the time of driving and temporary earthing service can be avoided. It can be easily separated.
(7) Since the structure has a shear resistance only on the surface of the flange portion of the H-shaped steel and the web of the hat-shaped steel sheet pile, the illustration is omitted, but the flange shape has a flange width exceeding the web width of the hat-shaped steel sheet pile. Even steel can be easily joined (in the case of the conventional welding method (method of fillet welding the flange side of H-shaped steel), the V-shaped part must be welded) Because it does not become flare welding, it is not easy to maintain the joint quality.)

  According to the second invention, in the combined steel sheet pile of the first invention, the steel sheet pile has a pair of flanges connected to both ends of the web and an arm connected to the other end of the flange. It is a hat-shaped steel sheet pile having a hat-shaped cross section provided with a joint at the tip, and the web of the hat-shaped steel sheet pile is provided with a number of holes or internally threaded holes at intervals in the vertical direction. A large number of female screw holes are provided at intervals in the vertical direction, and are detachable that are inserted into the screw holes of the hat-shaped steel sheet pile or screwed into the female screw holes of the web and screwed into the female screw holes of the flange of the H-shaped steel. Since it is joined by bolts, it can be a simple joining structure using bolts from the hat-shaped steel sheet pile side, and assembly and release of the hat-shaped steel sheet piles can also be performed using electric tools or manual tools. For good in wearing work, the effect of such can be easily joined or separated is obtained.

According to a third invention, in the combined steel sheet pile of the first invention, the steel sheet pile has a pair of flanges connected to both ends of the web, and an arm connected to the other end of the flange. A hat-shaped steel sheet pile having a cross-section with a joint at the tip, and a plurality of holes are provided in the hat-shaped steel sheet pile web at intervals in the vertical direction. Since the inner peripheral surface and the flange of the H-shaped steel are joined by fillet welding that can be removed by cutting or grinding, a simple joining structure by fillet welding from the hat-shaped steel sheet pile side can be achieved. Assembling and debonding of the hat-shaped steel sheet piles are also performed by joining or fusing by welding or a debonding operation using an electric grinding tool such as a grinder, so that effects such as easy joining or separation can be obtained.
Moreover, in the case of this invention, since it becomes possible to weld at the center side of the width direction of the web of a hat-shaped steel sheet pile compared with the prior art which welds in the location near the flange of a hat-shaped steel sheet pile, and the corner of a web. , Thermal deformation during processing (expansion of the full width of the hat-shaped steel sheet pile) can be suppressed (in the conventional welding type, welding was performed at a location close to the flange of the hat-shaped steel sheet pile and the corner of the web) The welding heat causes the left and right inclined flanges in FIG. 25 (a) to expand further outwardly, causing a deformation in which the full width of the hat-shaped steel sheet pile is expanded.

  According to a fourth invention, in the combined steel sheet pile of the first invention, the steel sheet pile has a pair of flanges connected to both ends of the web and an arm connected to the other end of the flange. A hat-shaped steel sheet pile having a cross-section with a joint provided at the tip, and the web of the hat-shaped steel sheet pile and the flange of the H-shaped steel are spaced from each other in the vertical direction at a large number from the hat-shaped steel sheet pile side. Since it is joined by a drill screw and the tip of each drill screw does not protrude from the flange of the H-shaped steel, there is no possibility that the tip of the drill screw will be deformed or damaged when the combined steel sheet pile is press-fitted or pulled out from the ground. When the hat-shaped steel sheet pile and the H-shaped steel in the combined steel sheet pile are separated, effects such as being able to easily pull out the drill screw and separate them are obtained. In addition, since no through-hole is provided in the H-shaped steel and the steel sheet pile, no water channel is formed, and effects such as prevention of water leakage and drill screw corrosion can be obtained.

According to a fifth invention, in any one of the combination sheet pile of the first invention to the fourth invention, the section modulus of the combination sheet pile is because there is a 3,500cm ³ / m~14,000cm ³ / m, Even if the depth exceeds 10 m and the underground continuous wall has a depth of about 25 m, it is possible to obtain an effect that the combined steel sheet pile can be handled.

  According to the underground continuous wall of the sixth invention, the combination steel sheet piles of any one of the first invention to the fifth invention are constructed by fitting and fitting the joints, so the cut groove side In a state in which the connection between the steel sheet pile (hat-shaped steel sheet pile) and the H-shaped steel is removed, the underground continuous wall using the combined steel sheet pile that can pull out all or part of the combined steel sheet pile can be used. The effect that it can do is acquired.

  According to the method for removing the combined steel sheet pile of the seventh invention, the method for removing the combined steel sheet pile in the underground continuous wall of the sixth invention, wherein the ground on the steel sheet pile side opposite to the H-shaped steel in the underground continuous wall To form an open groove, and after constructing an underground structure on the open groove side, the joint between the steel sheet pile and the H-section steel is released and separated from the space on the open groove side. Since the steel sheet piles are pulled out separately, the closed space 25 as shown in FIG. 23 (a) is not formed, and the disturbance of the surrounding ground can be reduced, and an effect such that construction can be performed using a small construction machine is obtained. .

  According to the method for removing a part of the combined steel sheet pile of the eighth invention, it is a method for removing a part of the combined steel sheet pile in the underground continuous wall of the sixth invention, and is the opposite side to the H-shaped steel in the underground continuous wall. After excavating the ground on the steel sheet pile side to form an open groove, the steel sheet pile was used as a formwork for building an underground structure, and after the construction was completed, the steel sheet pile and H-shaped steel Since the joint part is released and separated, and only the H-shaped steel is pulled out, it is possible to apply the steel sheet pile (hat-shaped steel sheet pile) in the combined steel sheet pile as a formwork for the main body wall, and formwork installation work space Therefore, the site can be used effectively.

The underground continuous wall using the combination steel sheet pile of 1st Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a partially notched front view of (a). It is a top view which expands and shows the combination steel sheet pile used in Fig.1 (a). The underground continuous wall using the combination steel sheet pile of 2nd Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a partially notched front view of (a). It is a top view which expands and shows the combination steel sheet pile used in Fig.3 (a). The underground continuous wall using the combination steel sheet pile of 3rd Embodiment of this invention is shown, Comprising: (a) is a cross-sectional top view, (b) is a partially notched front view of (a). It is a cross-sectional top view which expands and shows the combination steel sheet pile used in Fig.5 (a). The underground continuous wall using the combination steel sheet pile of 4th Embodiment of this invention is shown, Comprising: (a) is a cross-sectional top view, (b) is a partially notched front view of (a). It is a cross-sectional top view which expands and shows the combination steel sheet pile used in Fig.7 (a). The underground continuous wall using the combination steel sheet pile of 5th Embodiment of this invention is shown, Comprising: (a) is a cross-sectional top view, (b) is a partially notched front view of (a). It is a cross-sectional top view which expands and shows the combination steel sheet pile used in Fig.9 (a). The underground continuous wall using the combination steel sheet pile of 6th Embodiment of this invention is shown, Comprising: (a) is a cross-sectional top view, (b) is a partially notched front view of (a). It is a cross-sectional top view which expands and shows the combination steel sheet pile used in Fig.11 (a). The underground continuous wall using the combination steel sheet pile of 7th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a partially notched front view of (a). It is a top view which expands and shows the combination steel sheet pile used in Fig.13 (a). The underground continuous wall using the combination steel sheet pile of 8th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a partially notched front view of (a). It is a top view which expands and shows the combination steel sheet pile used in Fig.15 (a). The underground continuous wall using the combination steel sheet pile of 9th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a partially notched front view of (a). (A) is a top view which expands and shows the combination steel sheet pile used in Fig.17 (a), (b) is a figure which expands and shows a part of (a). The underground continuous wall using the combination steel sheet pile of 10th Embodiment of this invention is shown, Comprising: (a) is a top view, (b) is a partially notched front view of (a). (A) is a top view which expands and shows the combination steel sheet pile used in Fig.19 (a), (b) is a figure which expands and shows a part of (a). (A) to (e) use the combined steel sheet pile of the present invention as a temporary combined steel sheet pile, and then excavate after intrusion, disassemble and remove the combined steel sheet pile after construction of an underground structure, and store or reuse it. It is a schematic explanatory drawing which shows a form. (A)-(e) uses the combination steel sheet pile of the present invention as a temporary combination steel sheet pile, and then excavates the ground after intrusion. After constructing the underground structure, the joint of the combination steel sheet pile is released and the H-section steel is released. It is a schematic explanatory drawing which shows the form which draws out only storage or reuses. (A) is explanatory drawing for demonstrating that extraction resistance increases with the influence range to the surrounding ground at the time of extracting a combination steel sheet pile. (B) is explanatory drawing for demonstrating that drawing resistance becomes small because the influence range to the surrounding ground at the time of isolate | separating and pulling out a combination steel sheet pile becomes small. It is explanatory drawing at the time of providing a formwork installation and work space from the conventional temporary earth retaining wall, and constructing a concrete underground structure. (A) (b) is a cross-sectional top view which shows two examples of the conventional combination steel sheet pile. (A) is a longitudinal side view showing one side in a state where the space between the underground continuous walls using the combined steel sheet pile of the embodiment of the present invention is cut, and (b) is a bolt or drill screw removed from the state of (a) It is a longitudinal side view which made the state which cancel | released and isolate | separated the hat-shaped steel sheet pile, and the H-section steel, and was made into the state which can be extracted.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  First, common components in the embodiment of the combined steel sheet pile of the present invention will be described with reference to the combined steel sheet pile of the first embodiment, and then the combined steel sheet pile of each embodiment and the underground continuous wall using the same Will be described.

  With reference to FIG. 2 which shows the combination steel sheet pile used in FIG. 1 and the same figure (a), if it demonstrates to the common structure about the combination steel sheet pile 1 of this invention, the combination steel sheet pile 1 will be a hat-shaped steel. A steel sheet pile made of a sheet pile 10 and an H-shaped steel 20 are provided.

  The hat-shaped steel sheet pile 10 is integrally provided with flanges 12 which are inclined so as to be separated from each other on one side of the web 11 on both sides in the width direction of the web 11 in a plan view. 11 is provided with an arm portion 13 in parallel with the arm portion 13, and a joint 14 is provided at the tip of the arm portion 13. Of the left and right joints 14, one joint 14 and the other joint 14 are adjusted to have a point-symmetric shape. This joint 14 is formed in a shape that can be fitted to other joints 14 in other adjacent combined steel sheet piles 1, and the fitting strength is increased so that the joints 14 are not separated from each other at the time of fitting. It has been.

  Moreover, the hat-shaped steel sheet pile 10 used in the present invention is a rolled steel material by hot rolling, and the fitting grooves and the locking claws are formed into point-symmetric shapes by the left and right joints 14, and the strength of the joints 14 is increased. It is an elevated steel sheet pile.

  The H-section steel 20 is manufactured by rolling, and includes a web 21 and flanges 22 provided at both ends of the web 21. One flange portion 22 in the H-shaped steel 20 is fixed to the web 11 on the groove side formed by each flange 12 and the web 11 in the hat-shaped steel sheet pile 10, and the web 11 on the opposite side to the groove side. There is a form fixed to the outer surface of the. The fixing form of the web 11 in the hat-shaped steel sheet pile 10 and the flange 22 of the H-section steel 20 is different in each embodiment. In any form, the joining means from the hole side provided on the hat-shaped steel sheet pile 10 side is used. The joining structure by the joining means is a joining structure having shear resistance only at the surface where the flange portion 22 of the H-shaped steel 20 and the web 11 of the steel sheet pile 10 are in contact with each other. It is a joining structure by any one of bolts, screws or fillet welds that does not protrude to the ground side from the flange portion 22 of the steel 20, and is a detachable joining structure.

  One side of the web 11 of the hat-shaped steel sheet pile 10 is overlapped with one flange 22 of the H-shaped steel 20, and the upper part excluding the lower part 9 located in the ground in the hat-shaped steel sheet pile 10 and the H-shaped steel. In the upper part excluding the lower part located in the ground at 20, the web 11 of the hat-shaped steel sheet pile 10 and one flange 22 of the H-shaped steel 20 are bolts and fillets from the hat-shaped steel sheet pile 10 side. It is joined by joining means such as welding or a drill screw. Since the surface opposite to the H-shaped steel 20 side surface of the hat-shaped steel sheet pile 10 is the surface on the cut groove side when the combined steel sheet pile 1 is cut after being penetrated into the ground, the combined steel sheet pile 1 of the present invention. Then, it is set as the joining structure which can cancel | release the joining of the hat-shaped steel sheet pile 10 and the H-section steel 20 from the surface by the side of a cut groove. As described above, in the present invention, the web 11 in the hat-shaped steel sheet pile 10 and the flange 22 of the H-shaped steel 20 are the web 11 in the hat-shaped steel sheet pile 10 except for the lower portion 9 in the combined steel sheet pile 1. Because it is structured to be joined from the side, underground continuous walls (continuous walls built in the ground, including both temporary and permanent temporary use) or earth retaining walls (open cut) Sometimes the wall that stops the earth, including the case of permanent installation, temporary installation, and temporary installation (including the case with or without a beam), the hat-shaped steel sheet pile 10 on the upper side excluding the lower portion 9 is formed. By exposing one side of the web 11 in Fig. 26 (a) and Fig. 26 (b) as a representative form, the joints (bolts 3 and the like) are removed, so that the joint can be released and separated. The combined steel sheet pile 1 is used. Further, the hat-shaped steel sheet pile 10 and the H-shaped steel 20 are separated so as not to be bulky and to be stored or transported. The said lower part 9 is a part embedded in the ground until the joint part in each combination steel sheet pile 1 is removed and separated in the state in which the cut groove is formed. The combined steel sheet pile 1 of the present invention is a combined steel sheet pile that can be easily constructed by assembling the hat-shaped steel sheet pile 10 and the H-shaped steel 20 on site or disassembling on site. Therefore, it is a combination steel sheet pile 1 that can be easily assembled and disassembled even in a factory.

  Hereinafter, each embodiment will be described in more detail.

  With reference to FIG. 2 which shows the combination steel sheet pile used in FIG. 1 and the same figure (a), when the combination steel sheet pile 1 of 1st Embodiment of this invention is demonstrated, the web 11 in the hat-shaped steel sheet pile 10 is demonstrated. A plurality of bolt insertion holes or female screw holes 2 are provided in the upper part at intervals in the vertical direction in a plurality of rows (two rows in the illustrated case) at intervals in the width direction. One flange 22 of the H-shaped steel 20 is superposed on the outer surface of the web 11 opposite to the groove formed by the web 11 and each flange 12 in the hat-shaped steel sheet pile 20 so as to extend in the longitudinal direction of the member. Has been placed. In addition, corresponding to the bolt insertion hole or female screw hole 2, the flange 22 of the H-section steel 20 is provided with a large number of female screw holes 23 spaced in the width direction and spaced in the vertical direction. The female screw hole 23 is provided so as to be within the thickness of the flange 22 of the H-shaped steel 20 so as to prevent leakage of groundwater from the through-holes of the H-shaped steel and the steel sheet pile and rust prevention of the female screw portion. I have to. Further, the hat-shaped steel sheet pile 10 is inserted into or screwed into the bolt insertion hole or the female screw hole 2 of the web 11 and is screwed into the female screw hole 23 of the flange 22 of the H-shaped steel 20 to form a hat shape. The H-section steel 20 is fixed to the steel sheet pile 20, and the bending rigidity of the combined steel sheet pile 1 is increased. In this embodiment, only the surface where the flange portion 22 of the H-section steel 20 and the web 11 of the steel sheet pile 10 are in contact has a joining structure in which shear resistance is provided by the shear strength of the three shaft portions of the bolt. Moreover, the bolt 3 has a structure in which the flange 3 of the H-shaped steel 20 does not protrude to the ground side (the ground mountain side), the rust prevention of the bolt 3 is measured, the bolt 3 is removed, and the combined steel sheet pile 1 Is easy to disassemble or reuse.

  In the above-described embodiment, since the tip portions of a large number of bolts 3 do not protrude from the flange 22 of the H-shaped steel 20, there is no possibility that the tip portions of the bolts 3 will be bent or the threaded portions may be damaged when the ground penetrates. When the hat-shaped steel sheet pile 10 and the H-shaped steel 20 are to be separated later, the detachable bolt 3 is used as a rotating tool (not shown) on the bolt head on the hat-shaped steel sheet pile 10 side. ), The joint between the hat-shaped steel sheet pile 10 and the H-shaped steel 20 can be released. Although not shown, instead of the female screw hole 23 provided in the flange 22 of the H-section steel 20, a recess is provided in the flange 22 of the H-section steel 20, and a nut is accommodated in the recess and fixed by welding. Alternatively, a large-diameter female screw hole may be provided in the flange 22 of the H-shaped steel 20, and a female screw member having a male screw on the outer peripheral surface may be screwed and fixed by welding as appropriate. Further, the width dimension of the flange 22 of the H-shaped steel 20 is made larger than the width dimension of the web 11 of the hat-shaped steel sheet pile 10 so that the flange 22 of the H-shaped steel 20 projects from the web 11 of the hat-shaped steel sheet pile 10. It may be. Thus, when the flange 22 of the H-section steel 20 has a wide width, the number of bolts for joining, female screw holes, nuts, and the like can be increased, and the joining strength can be further increased.

Section modulus about the horizontal direction axis passing through the center of gravity in combination sheet pile 1 shown in FIG. 2, for example, there is a 3,500cm ³ / m~14,000cm ³ / m. By setting it as such a section modulus, it is set as the combination steel sheet pile 1 for earth retaining, such as temporary installations with a depth of about 10 m to 25 m.

  As shown in FIG. 1, the combined steel sheet pile 1 is penetrated into the ground, adjacent joints 14 are fitted together and penetrated into the ground, and as shown in FIG. 21 (a) or 22 (a), After constructing the intermediate continuous wall 15, the ground between the underground continuous walls 15 facing each other is excavated, and the underground structure 4 is constructed by installing the beams, and then the hat-shaped steel sheet pile 10 and the H-shaped steel 20 are joined. All the bolts 3 are removed in order to release the ground, and as shown in FIG. 21B or 22B, the space between the underground structure 4 and the underground continuous wall 15 is backfilled with excavated soil or the like. The cut beam is removed, and as shown in FIG. 21 (c), the hat-shaped steel sheet pile 10 and the H-shaped steel 20 are separately pulled out by a general-purpose construction machine, and as shown in the right side of FIG. Stack and store about 5 pieces of hat-shaped steel sheet piles 10 each, or through spacers such as piers as appropriate Te, stacked Keep. In addition, a plurality of H-section steels 20 are arranged in parallel, and are stacked and stored in a plurality of stages through spacers such as piers. Further, when it is necessary to replace the worn hat-shaped steel sheet pile 10, as shown in FIG. 21 (d), after the replacement with a new hat-shaped steel sheet pile 10, the same structure as the joint structure before the replacement Then, a new combined steel sheet pile 1 is obtained. In addition, when it is necessary to replace the H-section steel with higher rigidity (or smaller), as shown in FIG. 21 (e), the H-section steel 20 with a larger (or smaller) beam height (because of the beam) is used. By replacing it, it becomes a combination steel sheet pile placed in a deeper (or shallower) place at the site. In such a case, the size of the bolt insertion hole or the female screw hole 2 provided in the old and new hat-shaped steel sheet piles 10 before and after the replacement, and the horizontal and vertical intervals, and the female screw hole provided in the old and new H-shaped steel 20 before and after the replacement. 23 is made the same size, and the left and right and top and bottom pitches are made constant, so that joining due to misalignment is not impossible. In the above-mentioned case, the form is used as the temporary combination steel sheet pile 1, but the form in which the hat-shaped steel sheet pile 10 is left and left as a part of the wall in the underground structure 4 is shown in FIG. It is shown.

  As shown in FIG. 22 (c), when a concrete wall is provided on the ground cutting side of the hat-shaped steel sheet pile 10 while leaving a part of the hat-shaped steel sheet pile 10, only the H-shaped steel 20 is pulled out, Stack and store in the same way. Further, the hat-shaped steel sheet pile 10 other than the one to be left is similarly pulled out and stored in the same manner as described above, and if necessary, as shown in FIG. 22 (d) or (e), a hat-shaped steel sheet pile or H Replace shape steel 20 The form of FIG.21 and FIG.22 is applicable similarly also in the following embodiment.

  With reference to FIG. 4 which shows the combination steel sheet pile used in FIG. 3 and the same figure (a), when the combination steel sheet pile 1 of 2nd Embodiment of this invention is demonstrated, in this form, the hat-shaped steel sheet pile 10 is demonstrated. 4 differs from the first embodiment in that the flange 22 of the H-section steel 20 is arranged on the groove-side web 11 formed by the web 11 and the flanges 12 in the horizontal direction in FIG. The bending rigidity around the axis in the left-right direction passing through the centroid is reduced, but is otherwise the same as in the first embodiment. In the second embodiment, the same hat-shaped steel sheet pile 10 and H-section steel 20 are used, and even though the cross-sectional area is the same, the rigidity is smaller than in the case of the first embodiment because the height is reduced. However, it can be installed from the site boundary and the site can be used effectively. Other points are the same as those in the embodiment and the modified embodiment.

  The same applies to the following embodiments, but the hat-shaped steel sheet pile 10 of the present invention as described above can exhibit the following effects (1) to (8).

(1) Separation of the hat-shaped steel sheet pile and the H-shaped steel is facilitated, and the hat-shaped steel sheet pile and the H-shaped steel can be separately transported and stored, so that transportation and storage costs can be reduced.

(2) By separating the hat-shaped steel sheet pile and the H-shaped steel and pulling them separately, the peripheral surface resistance of the ground can be reduced, and the drawing becomes easy. (Conventionally, since the joining location (welded part) was arranged on the back soil side, it was impossible to separate the hat-shaped steel sheet pile and the H-shaped steel before drawing.)

(3) Since the peripheral friction of the combined steel sheet pile when pulling depends on the surface area, the hat-shaped steel sheet pile alone is about 4 times the combined steel sheet pile by separating the hat-shaped steel sheet pile and the H-shaped steel separately. The H-shaped steel can be pulled out with a force of about 60%. Therefore, it is possible to pull out with a smaller construction machine than when the combined steel sheet pile is pulled out as a unit, leading to a reduction in construction cost.

(4) It is possible to replace and reuse only the hat-shaped steel sheet pile that is easily worn when placing on the ground, and the construction cost can be reduced. (Conventionally, it is uneconomical because it is used up once and loses all, but in the case of the present invention, it is economical because it is possible to divert H-shaped steel, which accounts for about 60% and 70% of the total steel weight). .)

(5) It is possible to combine H-shaped steels of different sizes, and it is possible to make a rational wall body specification in another project that requires different cross-sectional rigidity.

(6) Since the hat-shaped steel sheet pile and the H-shaped steel can be pulled out separately, even a combination steel sheet pile of a size that could not fit in the gripping mechanism with a general-purpose press-fitting machine can be pulled out. It is also possible to secure the reaction force by gripping the hat-shaped steel sheet pile.)

(7) Since the hat-shaped steel sheet pile and the H-shaped steel are pulled out separately, a closed space is not formed, and disturbance of the surrounding ground can be reduced.

(8) The hat-shaped steel sheet pile can be applied as a formwork for the main body wall, and the site can be used to the maximum extent.

  With reference to FIG. 6 which shows the combination steel sheet pile used in FIG. 5 and the same figure (a), the combination steel sheet pile 1 of 3rd Embodiment of this invention is demonstrated. In this embodiment, the flange 22 of the H-section steel 20 is superimposed on the outer surface of the web 11 opposite to the groove formed by the web 11 and each flange 12 in the hat-shaped steel sheet pile 10 and attached by fillet welding W. . In this embodiment, the web 11 of the hat-shaped steel sheet pile 10 is provided with a plurality of circular through holes 5 smaller than the flange width dimension of the H-section steel 20 at intervals in the vertical direction. It is the form which fixed the upper part side of the member longitudinal direction of the hat-shaped steel sheet pile 10 and the H-shaped steel 20 by the fillet weld W with the flange 22 of the shaped steel 20. The diameter of the circular through hole 5 is smaller than the flange width of the H-section steel 20. The fillet welding at the inner peripheral surface portions on the left and right sides of the circular through-hole 5 transmits stress in the vertical direction more than the fillet welding at the upper and lower inner peripheral surface portions of the circular through-hole 5. Is advantageous. The fillet weld W can be removed by means of an electric grinding tool such as fusing or a grinder. The throat thickness dimension of the fillet weld W is set by design. In this embodiment, as a joint structure having a shear resistance only at the surface where the flange portion 22 of the H-section steel 20 and the web 11 of the steel sheet pile 10 are in contact, it does not protrude to the ground side from the flange 22 of the H-section steel 20. It is set as the joining structure by the fillet weld W, and it can be removed by removing the fillet weld W. Other forms are the same as in the previous embodiment.

  With reference to FIG. 8 which shows the combination steel sheet pile used in FIG. 7 and the same figure (a), when the combination steel sheet pile 1 of 4th Embodiment of this invention is demonstrated, in this form, the hat-shaped steel sheet pile 10 is demonstrated. The flange 22 of the H-section steel 20 is disposed so as to overlap the surface of the groove-side web 11 formed by the web 11 and the flanges 12, and the hat-shaped steel sheet pile 10 side opposite to the H-section steel 20 The inner peripheral surface of the circular through hole 5 and the flange outer surface of the H-shaped steel 20 are joined by fillet weld W, and the flange 22 of the H-shaped steel 20 and the web 11 of the steel sheet pile 10 are in contact with each other. The joint structure has shear resistance only by fillet welding W. This form can also be removed by removing the fillet weld W. Other forms are the same as those shown in FIG.

  With reference to FIG. 10 which shows the combination steel sheet pile used in FIG.9 and the same figure (a), when the combination steel sheet pile 1 of 5th Embodiment of this invention is demonstrated, in this form, the hat-shaped steel sheet pile 10 is demonstrated. Is formed in the longitudinal direction of the web 11 as a long through hole 5. Thus, by making it a long hole, since the fillet weld W long in the member longitudinal direction of the hat-shaped steel sheet pile 10 becomes possible and the weld length becomes long, a large stress can be transmitted. In addition, the welding work is facilitated as the number of welding points is reduced. In such a form, fillet welding is preferably performed along the linear inner peripheral surface on the inner peripheral surface of the linear portion in the through hole 5 of the long hole. By performing fillet welding in this way, it is possible to resist the load acting in the axial direction by applying a shearing force in the longitudinal direction of the welded portion, in the direction in which the tensile residual stress is generated in the welded portion, Since no load is applied, the fatigue performance of the welded portion can be improved. Other configurations are the same as those of the above embodiment.

  With reference to FIG. 12 which shows the combination steel sheet pile used in FIG.11 and the same figure (a), when the combination steel sheet pile 1 of 6th Embodiment of this invention is demonstrated, the web 11 in the hat-shaped steel sheet pile 10 and The H-section steel 20 is arranged on the groove side formed by each flange 12, and the portion of the long through-hole 5 provided in the web 11 of the portion excluding the lower portion of the hat-shaped steel sheet pile 10 is the same as in the above embodiment. Similarly, it is a form joined by fillet weld W.

  With reference to FIG. 14 which shows the combination steel sheet pile used in FIG. 13 and the same figure (a), when the combination steel sheet pile 1 of 7th Embodiment of this invention is demonstrated, in this form, the hat-shaped steel sheet pile 10 is demonstrated. On the opposite side of the groove formed by the web 11 and each flange 12, the flange 22 of the H-shaped steel 20 is superimposed on the web 11 of the hat-shaped steel sheet pile 10, and the drill screw 6 from the hat-shaped steel sheet pile 10 side. However, the web 11 of the hat-shaped steel sheet pile 10 is fixed to the H-shaped steel 20 by being screwed into the flange 22 of the H-shaped steel 20. In this embodiment, the tip of the drill screw 6 is prevented from protruding from the back surface of the flange 22 of the H-section steel 20. The length dimension of the drill screw 6 excluding the head as the rotating engaging portion is the total dimension of the thickness of the web 11 of the hat-shaped steel sheet pile 10 and the thickness of the flange 12 of the H-shaped steel 20. By being set as the following, the front-end | tip part of the drill screw 6 is prevented from projecting to the back surface side of the flange 22 of the H-section steel 20. In order to facilitate joining by the drill screw 6, a leading hole smaller than the shaft diameter of the drill screw 6 is provided in advance in one or both of the web 11 of the hat-shaped steel sheet pile 10 and the flange 22 of the H-shaped steel 20. In such a state, the web 11 of the hat-shaped steel sheet pile 10 may be joined by the drill screw 6, but may be joined by the drill screw 6 in a state where no tip hole is provided. In the illustrated embodiment, a large number of drill screws 6 in the hat-shaped steel sheet pile 10 are spaced from each other in the longitudinal direction of the web 11 in the hat-shaped steel sheet pile 10 and spaced apart in the width direction from the web 11 side in the hat-shaped steel sheet pile 10. The combined steel sheet pile 1 is screwed into the flange 22 of the section steel 20 and joined together.

  When the web 11 of the hat-shaped steel sheet pile 10 and the flange 22 of the H-shaped steel 20 are joined by the drill screw 6, the tip of the drill screw 6 does not protrude from the back surface of the flange 22 of the H-shaped steel 20. For this reason, when the combined steel sheet pile 1 penetrates into the ground or is pulled out, the tip of the drill screw 6 is not deformed. Moreover, since a through-hole is not formed over H-shaped steel and a steel sheet pile, it is possible to prevent groundwater leakage and drill screw corrosion. Therefore, when a retaining wall is constructed and an opening groove is formed by excavating the retaining wall, the drill screw 6 is rotated from the opening groove side by a power tool (not shown) or the like. Then, the drill screw 6 can be pulled out and the joint by the drill screw 6 can be released. The joint between the hat-shaped steel sheet pile 10 and the H-shaped steel 20 can be released, and the H-shaped steel 20 can be pulled out. And the H-shaped steel 20 can be pulled out separately using a small construction machine.

  With reference to FIG. 16 which shows the combination steel sheet pile used in FIG.15 and the same figure (a), when the combination steel sheet pile 1 of 8th Embodiment of this invention is demonstrated, in this form, the hat-shaped steel sheet pile 10 is demonstrated. In this embodiment, the flange 22 of the H-shaped steel 20 is overlapped with the web 11 on the groove side formed by the web 11 and the flanges 12 and joined by the drill screw 6. However, the other points are the same as in the above embodiment.

  With reference to FIG. 18 which shows the combination steel sheet pile used in FIG. 17 and the same figure (a), when the combination steel sheet pile 1 of 9th Embodiment of this invention is demonstrated, in this form, the hat-shaped steel sheet pile 10 is demonstrated. In the web 11, a frustoconical bolt head receiving groove 7 for receiving the head of the drill screw 6 is formed, and the head 8 of the drill screw 6 extends from the outer surface of the web 11 in the hat-shaped steel sheet pile 10. The outer surface of the drill screw 6 in the axial direction of the head and the outer surface of the web 11 in the hat-shaped steel sheet pile 10 opposite to the H-shaped steel 20 are flush with each other so as not to protrude. In addition to preventing damage, the head 8 of the drill screw 6 is configured not to become an obstacle when the ground enters or is pulled out.

  19 and FIG. 20 showing the combined steel sheet pile used in FIG. 19A, the combined steel sheet pile 1 of the tenth embodiment of the present invention will be described. In this embodiment, the hat-shaped steel sheet pile 10 The flange 11 of the H-section steel 20 is superimposed on the groove-side web 11 formed by the web 11 and each flange 12 in FIG. A bolt head receiving groove 7 is formed, and the web 11 in the hat-shaped steel sheet pile 10 is joined to the flange 22 of the H-shaped steel 20 by a number of drill screws 6 from the web 11 side in the hat-shaped steel sheet pile 10. In this respect, it is different from the above embodiment, but the other points are the same as the above embodiment.

  When the underground continuous wall 15 is constructed using the combination steel sheet pile 1 of each embodiment, a plurality of the combination steel sheet piles 1 of the above embodiments are fitted via joints of the combination steel sheet pile 1. By cutting the web 11 side of the hat-shaped steel sheet pile 10 on the opposite side to the H-shaped steel 20 side, the hat-shaped steel sheet pile 10 is formed from the cut groove side after the underground structure is constructed. The metal fitting etc. which join the web 11 and the flange 22 of the H-section steel 20 can be removed. Then, as shown in FIG. 21 or FIG. 22, the H-section steel 20 is pulled out and stacked and stored on the yard near the construction site, or the H-section steel 20 and the hat-shaped steel sheet pile 10 are pulled out separately and stacked. In this case, the H-section steel 20 or the hat-shaped steel sheet pile 10 can be replaced with a new or separate member.

  For example, when the underground continuous wall 15 is removed, as described above, the ground on the steel sheet pile side opposite to the H-shaped steel in the underground continuous wall is cut to form a cut groove, and the cut groove side After the construction of the underground structure, the joint between the steel sheet pile and the H-section steel is released and separated from the space on the side of the cut groove, and the H-steel and steel sheet pile are pulled out separately. According to the sheet pile removal method, as shown in FIG. 23 (b), since the influence on the surrounding ground is small, it can be pulled out separately using a small drawing construction machine, and in the case of the combined steel sheet pile 1 It can be stacked and stored so as not to be bulky. Moreover, after canceling | releasing joining of the web 11 and the flange 22 of the H-shaped steel 20 in the hat-shaped steel sheet pile 10, only the H-shaped steel is pulled out, and only the hat-shaped steel sheet pile 10 is left, and the hat-shaped steel sheet pile. 10 can be used as a formwork for forming wall concrete, so that the combined steel sheet pile 1 can be used efficiently.

  When practicing the present invention, a steel sheet pile other than the hat-shaped steel sheet pile 10 and a combined steel sheet pile using H-shaped steel or I-shaped steel may be used. Moreover, when implementing this invention, the upper end part of steel sheet piles, such as a hat-shaped steel sheet pile 10, and the upper end part of H-shaped steel or I-shaped steel shall be the same position in an up-down direction, and steel, such as a hat-shaped steel sheet pile 10, etc. The lower end portion of the sheet pile and the lower end portion of the H-shaped steel or I-shaped steel may be in the same position in the vertical direction as shown, and the lower end portion of the steel sheet pile such as the hat-shaped steel sheet pile 10 may be projected. H-shaped steel or I-shaped steel may be projected. Although not shown, when the present invention is implemented, the flange width of the H-shaped steel is wider than the web width of the hat-shaped steel sheet pile, and the flange of the H-shaped steel protrudes from the web of the hat-shaped steel sheet pile. It is good also as a combination steel sheet pile of the form which is.

DESCRIPTION OF SYMBOLS 1 Combination steel sheet pile 2 Bolt penetration hole or female screw hole 3 Bolt 4 Underground structure 5 Through hole 6 Drill screw 7 Bolt head accommodation groove 8 Drill screw head 9 Lower part 10 Hat-shaped steel sheet pile 11 Web (hat-shaped steel sheet pile) of)
12 Flange (for hat-shaped steel sheet pile)
13 arm part 14 joint 15 underground continuous wall 20 H-section steel 21 web (of H-section steel)
22 Flange (H-shaped steel)
23 Female threaded hole 24 Combined steel sheet pile 25 Closed space 26 Surrounding ground 27 Steel sheet pile 28 H-shaped steel 29 Bolt 30 Nut 31 Steel for underground continuous wall

Claims (8)

  A steel sheet pile having a web at the center in the width direction and a steel sheet pile having joints at both ends, and a steel sheet pile web and H The surface of the ground-cutting side opposite to the H-shaped steel and the upper portion excluding the lower portion located in the ground, where the flange of the steel is in contact with the flange of the H-shaped steel and the web of the steel sheet pile The joint structure is a joint structure formed by any of bolts, screws, or fillet welds that are joined with a joint structure having shear resistance only and do not protrude to the ground side from the flange portion of the H-shaped steel. A combined steel sheet pile characterized by being removable.   The steel sheet pile has a hat-shaped steel sheet pile having a hat-shaped cross section in which a pair of flanges are connected to both ends of the web, an arm is connected to the other end of the flange, and a joint is provided at the tip of the arm. The web of the hat-shaped steel sheet pile is provided with a large number of holes or female screw holes at intervals in the vertical direction, and the H-shaped steel flange is provided with a large number of female screw holes at intervals in the vertical direction. 2. The steel sheet pile according to claim 1, wherein the hat-shaped steel sheet pile is joined by a detachable bolt inserted into a female screw hole of the H-shaped steel flange and screwed into a female screw hole of the web. Combination steel sheet pile as described.   The steel sheet pile has a hat-shaped steel sheet pile having a hat-shaped cross section in which a pair of flanges are connected to both ends of the web, an arm is connected to the other end of the flange, and a joint is provided at the tip of the arm. The hat-shaped steel sheet pile web is provided with a number of holes at intervals in the vertical direction, and the inner peripheral surface of the hole of the hat-shaped steel sheet pile web and the flange of the H-shaped steel are removed by fusing or The combined steel sheet pile according to claim 1, wherein the combined steel sheet pile is joined by fillet welding that can be ground and removed.   The steel sheet pile has a hat-shaped steel sheet pile having a hat-shaped cross section in which a pair of flanges are connected to both ends of the web, an arm is connected to the other end of the flange, and a joint is provided at the tip of the arm. The web of the hat-shaped steel sheet pile and the flange of the H-shaped steel are joined by a number of drill screws from the hat-shaped steel sheet pile side at intervals in the vertical direction, and the tips of the respective drill screws are H-shaped. The combined steel sheet pile according to claim 1, wherein the combined steel sheet pile does not protrude from a steel flange. Section modulus of the combination sheet pile is, 3,500cm ³ / m~14,000cm ³ / combination sheet pile according to any one of claims 1 to 4, characterized in that m and being.   An underground continuous wall, wherein the plurality of combined steel sheet piles according to any one of claims 1 to 5 are constructed by fitting and fitting joints.   It is a removal method of the combined steel sheet pile in the underground continuous wall according to claim 6, wherein the ground on the steel sheet pile side opposite to the H-shaped steel in the underground continuous wall is cut to form a cut groove, After constructing an underground structure on the side of the cut groove, the joint between the steel sheet pile and the H-section steel is released and separated from the space on the side of the cut groove, and the H-section steel and the steel sheet pile are pulled out separately. To remove the combined steel sheet pile from the underground continuous wall.   It is a removal method of a part of combined steel sheet pile in the underground continuous wall of Claim 6, Comprising: The ground of the steel sheet pile side on the opposite side to the H-section steel in this underground continuous wall is excavated, and an open groove is formed. In addition, after constructing an underground structure using a steel sheet pile as a formwork, the joint between the steel sheet pile and the H-section steel is released and separated from the space on the cut groove side, and only the H-section steel is pulled out. The removal method of a part of the combination steel sheet pile in the underground continuous wall.

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