EP2537988A2 - Verstärkte selbsttragende stützwandstruktur mit nutzung der bogenauswirkung und konstruktionsverfahren für aushub damit - Google Patents

Verstärkte selbsttragende stützwandstruktur mit nutzung der bogenauswirkung und konstruktionsverfahren für aushub damit Download PDF

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Publication number
EP2537988A2
EP2537988A2 EP10846233A EP10846233A EP2537988A2 EP 2537988 A2 EP2537988 A2 EP 2537988A2 EP 10846233 A EP10846233 A EP 10846233A EP 10846233 A EP10846233 A EP 10846233A EP 2537988 A2 EP2537988 A2 EP 2537988A2
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EP
European Patent Office
Prior art keywords
sheet panel
sheet
soldier pile
earth
retaining wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10846233A
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English (en)
French (fr)
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EP2537988A4 (de
Inventor
Gang Ho Park
Jun Kim
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2537988A2 publication Critical patent/EP2537988A2/de
Publication of EP2537988A4 publication Critical patent/EP2537988A4/de
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02—Sheet piles or sheet pile bulkheads
    • E02D5/03—Prefabricated parts, e.g. composite sheet piles
    • E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/02—Foundation pits
    • E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02—Sheet piles or sheet pile bulkheads

Definitions

  • the present invention relates to a reinforced self-supported retaining wall structure using an arching effect and a construction method of excavations using the same, and more particularly, to a reinforced self-supported retaining wall structure, which uses an arching effect, that supports a back earth pressure generated by vertical excavation.
  • a reinforced self-supported retaining wall structure which uses an arching effect, that is installed in the rear of an excavation space does not interfere with an excavation work and helps an efficient excavation work.
  • a self-supported retaining wall structure may be formed and the self-weight of the self-supported retaining wall structure supports a back earth pressure, which is a new concept of a continuous sheet wall.
  • the reinforced self-supported retaining wall structure since a reinforced self-supported retaining wall structure is installed in the rear of an excavation space, the reinforced self-supported retaining wall structure does not interfere with an excavation work. Accordingly, an excavation space is large so that an excavation work in a limited space such as a downtown area packed with tall buildings is made easy and efficient.
  • connection portion of a sheet panel is firmly fixed by upper and lower fixing devices so as to produce a combined section, not only rigidity is improved, but also the structure of the upper and low fixing devices is simplified so that assembly and disassembly thereof is made easy and also the sheet panel may be easily collected after construction is completed.
  • a conventional temporary earth retaining construction method to prevent collapse of excavated back earth during an excavation construction for an underground structure construction reinforces an insufficient support force of a soldier pile against an excavated back earth pressure.
  • a typical construction method includes a strut construction method and a sheet-pile construction method.
  • a strut construction method is a construction method to excavate the ground in a top-down method while reinforcing an insufficient horizontal support force of a soldier pile 10 against an excavated back earth pressure using a strut 20 (refer to FIG. 1 ).
  • the strut 20 functions as a horizontal member with respect to the soldier pile 10 that is a vertical member.
  • the strict 20 is perpendicular to the soldier pile 10.
  • the strut 20 is supported at two support points.
  • the two support points of the strut 20 are the soldier piles 10 located at opposite positions. Since the strut 20 is installed between the opposite soldier piles 10, a strut in a latitudinal direction and a strut in a longitudinal direction are perpendicular to each other on the same plane.
  • the struts in the latitudinal and longitudinal directions are obstacles that decrease a work space for entering equipment for an excavation work and discharging soil to the outside.
  • struts need to be piled more densely for structural safety.
  • the installed struts are sequentially removed at the installation of a permanent structure after an excavation space is prepared.
  • the construction of a permanent structure is performed by stages from the bottom toward the top in a bottom-up method.
  • the removal of struts is performed by stages. For example, assuming that the lowermost level of a permanent building is B1, struts installed on the level B1 are first removed to construct the level B1 of the permanent building. Even when the struts of the level B1 are removed, struts of upper levels B2, B3, B4, etc. as installed continue to support earth pressure. The struts removed from the level B1 need to be removed to the outside of the building and thus the struts in the latitudinal and longitudinal directions hinders the excavation work.
  • the strut construction method is problematic because the struts installed within an excavation space facing the soldier pile which narrows a work space for an excavation work and a soil discharge work. Also, since the struts are temporary structures, the struts need to be removed by stages during construction of a permanent structure. Thus, the struts remaining above hinder the sequential construction of a permanent structure so that work efficiency may be lowered.
  • Korean Patent Publication No. 2008-45182 which is a related art, discloses "Structure of Sheet-Pile Wall Forming Body".
  • Figure 3 of Korean Patent Publication No. 2008-45182 discloses an invention to address a problem of first and second interlocks 446 and 448 of U.S. Patent No. 6,715,964 B2 , which are illustrated in FIG. 2 .
  • a soil anchor 444 is coupled by the first interlock 446 of a first sheet 440 and the second interlock 448 of a second sheet 442.
  • a soil failure plane is the maximum tension force line T max -line to which an active earth pressure is applied.
  • An acting force 450 is a tension force applied to a soil destruction plane.
  • the soil anchor 444 resists the tension force.
  • Korean Patent Publication No. 2008-45182 points out that U.S. Patent No. 6,715,964 B2 has a problem in that a connection portion for coupling a sheet-pile wall sectioning portion to an anchorage receives a very high tension force due to an earth pressure of ground retaining from a surrounding area.
  • the purpose of Korean Patent Publication No. 2008-45182 is to develop a forming body that may endure a very high tension force without disassembly of the connection portion where the first interlock 446 and the second interlock 448 are engaged with each other.
  • Korean Patent Publication No. 2008-45182 is to configure a forming body that may endure a very high tension force without disassembly of the connection portion 16.
  • the forming body is a core structure of the shape and structure of the connection portion 16.
  • FIG. 3 illustrates a sheet-pile wall sectioning portion 12, a first anchorage 14, a connection portion 16, an open cell 18, an open cell 22, a flat panel type combination body 22, a support wall 24, a welding portion 26, and a double-T carrier 28.
  • Korean Patent Publication No. 2008-45182 and U.S. Patent No. 6,715,964 B2 have the same fundamental concept of balance of an earth pressure and a force against the earth pressure.
  • FIG. 4 illustrates a fundamental concept of an earth retaining system using a sheet-pile.
  • FIG. 4 is illustrated in U.S. Patent No. 6,715,964 B2 and also cited in the present invention. The fundamental concept of an earth retaining system is discussed below with reference to FIG. 4 .
  • a reference numeral 200 denotes a unit cell structure of a typical sheet pile.
  • the unit cell structure 200 has a U shape.
  • a sheet pile of a U shape includes a curved portion 210 and a linear portion 220. The curved portion 210 is closed and the linear portion 220 is open.
  • the unit cell structure 200 is vertically installed.
  • FIG. 4 is a plan view of the unit cell structure 200.
  • the unit cell structure 200 is a structure to support a back earth pressure P transferred through earth filling the inside of the unit cell structure 200.
  • a structure such as a road is built above the unit cell structure 200.
  • the back earth pressure P is based on a boundary condition of the unit cell structure 200 of a U shape. Referring to FIG. 8 , the back earth pressure P is positioned at the back side. In FIG. 4 , the back earth pressure P is applied to the curved portion 210 of the sheet pile.
  • the back earth pressure P and the frictional force F having opposite application directions are balanced with each other.
  • N denotes a vertical force acting on the linear portion 220 of the sheet pile.
  • the fundamental concept of the related art of FIG. 4 may be summarized as follows: the back earth pressure P acting on the curved portion 210 of the unit cell structure 200 is balanced with the frictional force F.
  • the present invention provides a reinforced self-supported retaining wall structure of a new concept which forms a lump of self-standing earth of a reinforced earth method using an arching effect generated due to a frictional force between earth particles and a sheet panel and resists an earth pressure applied to an excavation space by using the self-weight of the self-standing earth.
  • the present invention provides a reinforced self-supported retaining wall structure, which uses an arching effect, which is located at the back side of an excavation space so as not to be an obstacle to an excavation work so that a large excavation space may be used. Accordingly, an excavation work in a limited space in a downtown area where tall buildings are densely located may be easily and efficiently performed.
  • the present invention provides a reinforced self-supported retaining wall structure which may increase the rigidity of a connection portion of a group of serial sheet panels using upper and lower fixing devices by making the connection portion of the sheet panel be a combined section, and simultaneously facilitate the assembly and disassembly of the connection portion of the sheet panel due to a simple structure of the upper and lower fixing devices and thus make collection of installed sheet panels easy after construction is completed.
  • the present invention relates to a reinforced self-supported retaining wall structure using an arching effect
  • a general outline of an arching effect will be first described and then the arching effect in view of geotechnical engineering will be described.
  • the contained sand When the hole of a diameter d is not open, the contained sand is supported by the bottom plate. When the hole of a diameter d is open, the contained sand is discharged due to a self-weight W of the sand to a degree and the discharge is stopped while the sand forms an arch shape of an arc.
  • a phenomenon that the sand is no longer discharged and is supported by the arch shape of an arc even when the self-weight W of the sand exists may be referred to as an arching effect.
  • the arching effect is generated by the balance of a force to discharge the sand through the hole of a diameter d due to the self-weight W of the sand and a force to restrict the discharge of the sand due to a frictional force between the sand and four vertical surfaces of the box.
  • the arching effect may be a state in which the force to discharge the sand through the hole of a diameter d is balanced with the frictional force generated as the sand closely contacts the four vertical surfaces.
  • the arching effect is generated only when the amount of the frictional force and the size of the diameter d are appropriately balanced.
  • the sand is continuously discharged through the hole of a diameter d so that an arching effect may not be generated.
  • the self-weight W of the sand is applied through the hole of a diameter d and thus the sand is discharged through the hole of a diameter d by the self-weight W. Nonetheless, the sand is not continuously discharged. While forming an arch shape of an arc as illustrated in FIG. 5B , the sand is no longer discharged and the discharge of the sand is stopped.
  • a mutual shear stress is generated between the sand to be discharged through the hole of a diameter d and sand particles restricting the sand to be discharged.
  • the mutual shear stress supports the self-weight W of the sand in the arch shape of an arc.
  • the arch shape of an arc is a state in which sand particles are rearranged by shear stress generated between the discharged sand and the sand particles restricting the discharged sand.
  • the arch shape characteristically forms an arc in an upward direction with respect to a direction in which the self-weight W of the sand is applied, as illustrated in FIG. 5B .
  • the self-weight W of the sand is supported by the arch shape of an arc of FIG. 5B .
  • FIG. 8 is a 2-dimensional plan view of an earth retaining structure having the width B and the length L of FIG. 6 . Since an earth pressure P indicates an earth pressure at the same excavation height H, the amount of the earth pressure P is the same. B denotes the width between sheet panels and L denotes the length of the continuously installed sheet panels.
  • the application direction of PO is a vertical direction to the sheet panel.
  • the frictional force F is generated by a back earth pressure p and a shear stress ⁇ is distributed as illustrated in FIG. 22 or 9 .
  • the shear stress ⁇ gradually decreases toward a center portion O.
  • the shear stress ⁇ is necessarily applied to a plane other than the principal stress plane, that is, the I-I plane and the III-III plane, in addition to the perpendicular stress ⁇ , as illustrated in FIG. 23B .
  • the shear stress ⁇ and the perpendicular stress ⁇ on an a-a plane inclined counterclockwise by an angle ⁇ from the I-I plane is presented by a ⁇ - ⁇ relationship
  • the shear stress ⁇ and the perpendicular stress ⁇ on an a-a plane is a point "a" of FIG. 23C .
  • the trace of the point a may draw a Mohr's stress circle C having a diameter with both ends of a point I indicating the maximum principal stress ⁇ 1 and a point III indicating the minimum principal stress ⁇ 3 with respect to a point A on an axis ⁇ .
  • an arch shape line of an arc is formed.
  • a lump of earth existing on the same arch shape line functions as an arch shape crossbeam supporting an earth pressure.
  • the support of the weight W of sand disposed above in the arch shape of an arc in FIG. 5B is based on the above function of the arch shape.
  • a plurality of arch arcs No. 1, No. 2, No. 3, No. 4, ..., and No. n indicate arch shapes of an arc indicated at a constant interval.
  • the arch arc No. 1 supports the highest back earth pressure p and a degree of the back earth pressure p decreases as the number increases.
  • No back earth pressure is applied at the arch arc No. n.
  • the back earth pressure p in an area A of the arch arc No. n is 0. Since the area A is a place where a lagging 30 is located, the back earth pressure p is not applied to the lagging 30.
  • the lagging 30 Since the back earth pressure p is not applied to the area A of the lagging 30, the lagging 30 does not function as a structural member for supporting an earth pressure and functions as a protection member for simply preventing earth from flowing down.
  • the curved portion 210 of the unit cell structure 200 according to the related art that corresponds to the lagging 30 is a structural member for supporting the back earth pressure p unlike the present invention.
  • the curved portion 210 of the unit cell structure 200 and the lagging 30 of the present invention are totally different from each other in terms of structural mechanics.
  • the back earth pressure p decreases from the arch arc No. 1 to the arch arcs No. 2, No. 3, No. 4, ..., and No. n due to the arching effect. Since the back earth pressure p is necessarily 0 in the area A close to the lagging 30, earth within the sheet panels arranged parallel to one another forms a lump of earth and the lump of earth functions as a self-standing structure with respect to the back earth pressure p.
  • FIG. 10 illustrates the self-standing structure due to the arching effect.
  • the balance in force between the self-standing structure and the back earth pressure p is similar to reinforced earth. That is, the back earth pressure p is supported by the self-weight W of a lump of earth of the self-standing structure.
  • the concept of the self-standing structure due to the arching effect is a new concept totally different from that of the unit cell structure 200 having a U shape of FIG. 4 .
  • the range that 0.5 ⁇ L/B ⁇ 3.0 may be divided into a range that 0.5 ⁇ L/B ⁇ 1.5 and a range that 1.5 ⁇ L/B ⁇ 3.0.
  • the sheet panel insertion portion 22a' is formed at one end of the sheet panel 20 and the sheet panel protruding portion 22a is formed at the other end thereof.
  • an S-shaped bent portion 22b is formed at one end of the sheet panel 20 and a reversed S-shaped bent portion 22b' is formed at the other end thereof.
  • the shape of connection portions of the soldier pile 10 and the compression support plate 40 may vary according to the shape of the connection portion of the sheet panel 20.
  • the shape of the connection portion of the soldier pile 10 should be the soldier pile insertion portion 14a and the shape of the connection portion of the compression support plate 40 should be the compression support protruding portion 46a.
  • the shape of the connection portion of the soldier pile 10 should be a soldier pile protruding portion 14a' and the shape of the connection portion of the compression support plate 40 should be a compression support plate insertion portion 46a'.
  • the soldier pile protruding portion 14a' and the compression support plate insertion portion 46a' may vary according to the shape of the connection portion of the sheet panel 20, the illustration of the soldier pile protruding portion 14a' and the compression support plate insertion portion 46a' is omitted in the drawing, and the soldier pile insertion portion 14a and the compression support plate protruding portion 46a, which are located at the same positions, are used instead.
  • the shape of the connection portion of the soldier pile 10 should be the reversed S-shaped bent portion 14b' and the shape of the connection portion of the compression support plate 40 should be the S-shaped bent portion 40b.
  • connection portion of the soldier pile 10 should be the S-shaped bent portion 14b and the shape of the connection portion of the compression support plate 40 should be the reversed S-shaped bent portion 46b'.
  • the reversed S-shaped bent portion 14b' varies according to the shape of the connection portion of the sheet panel 20, the reversed S-shaped bent portion 14b' is omitted from the drawing, and the S-shaped bent portion 14b, which is located at the same position, is used instead.
  • connection shape of the soldier pile 10 and the compression support plate 40 varies according to the left and right connection shapes of the sheet panel 20
  • the connection shape of the sheet panel protruding portion 22a and the sheet panel insertion portion 22a' will be described as an example of the connection shape, for convenience of explanation.
  • connection shape of the soldier pile 10 is the soldier pile insertion portion 14a or the soldier pile protruding portion 14a', or the S-shaped bent portion 14b or the reversed S-shaped bent portion 14b'.
  • the connection shape of the compression support plate 40 is the compression support plate protruding portion 46a or the compression support plate insertion portion 46a', or the S-shaped bent portion 46b or the reversed S-shaped bent portion 46b'. Since the S-shaped bent portion 46b or the reversed S-shaped bent portion 46b' are selected according to the left and right connection shapes of the sheet panel 20, the illustration of the reversed S-shaped bent portion 46b' is omitted from the drawing, and the S-shaped bent portion 14b, which is located at the same position, is used instead.
  • the sheet panel connection portion 22 is firmly fixed by upper and lower fixing devices 50a and 50b.
  • connection portion 22 of the sheet panel 20 is firmly fixed by the upper and lower fixing devices 50a and 50b
  • the upper fixing device 50a is fixed by a coupling bolt 56a passing through the sheet panel 20, an attachment pad 52a, and a coupling plate 54a when the attachment pad 52a and the coupling plate 54a are sequentially located at both sides of the connection portion 22 of the sheet panel 20.
  • the lower fixing device 50b includes a first cut portion 52b and a second cut portion 56b.
  • An upward inclined surface 524b and a hook step 526b are formed at the first cut portion 52b and a rotation plate 54b and a spring 59b are formed at the second cut portion 56b.
  • An upper end inclined surface 542b is formed on an upper end of the rotation plate 54b that rotates around a hinge shaft 58b.
  • a lower end rotation groove 546b is formed in a lower end of the rotation plate 54b and a vertical insertion groove 544b is formed in a vertical surface thereof.
  • the spring 59b inserted in a spring insertion groove 548b is connected and fixed to a spring mounting device 562b.
  • the rotation plate 54b formed in the second cut portion 56b rotates around the hinge shaft 58b installed at an axis point 582b by an elastic force of the spring 59b so that the upper end inclined surface 542b of the rotation plate 54b is caught by the hook step 526b of the first cut portion 52b.
  • the lower end rotation groove 546b of the rotation plate 54b is formed to be deep enough for the rotation plate 54b to smoothly rotate without being caught by the lower end portion of the sheet panel 20.
  • the lower fixing device 50b is installed at the connection portion of two adjacent sheet panels 20 and the two adjacent sheet panels 20 are coupled by the first cut portion 52b and the second cut portion 56b.
  • the first cut portion 52b is formed in one sheet panel 20 and the second cut portion 56b is formed in the other sheet panel 20.
  • the two adjacent sheet panels 20 are fixed and coupled to each other by the operation of the rotation plate 54b.
  • the sum P of earth pressures p of the expression (1) is applied to a lump of earth between the continuous sheet panels 20.
  • the self-weight of the lump of earth is W
  • the self-weight W resists the sum P of earth pressures p.
  • L denotes the length of the continuous sheet panel 20
  • PO denotes the at-rest earth pressure
  • ⁇ denotes a frictional coefficient
  • C' is a frictional adhesive power
  • P - F O
  • Equation 5 when F is equal to or greater than P (F ⁇ P), a lump of earth existing in a space defined by the width B and the length L of the continuous sheet panel 20 may stand by itself due to the arching effect, maintaining the self-weight W.
  • F ⁇ P a lump of earth existing in a space defined by the width B and the length L of the continuous sheet panel 20 may stand by itself due to the arching effect, maintaining the self-weight W.
  • Equation 6 a result of the substitution is as follows. 2 ⁇ L ⁇ r ⁇ H ⁇ Ko ⁇ ⁇ + C ⁇ ⁇ B ⁇ r ⁇ H ⁇ Ka - 2 ⁇ C ⁇ Ka L / B ⁇ r ⁇ H ⁇ Ka - 2 ⁇ C ⁇ Ka / 2 ⁇ r ⁇ H ⁇ Ko ⁇ ⁇ + C ⁇
  • the insufficient length of the continuous sheet panel is compensated for by a passive earth pressure due to an embedded depth Hb of FIG. 21 .
  • the embedded depth Hb is a minimum 1.0 m to improve safety of a wall member and to maintain a freezing depth.
  • a lump of self-standing earth of a reinforced earth type in which a back earth pressure is not applied to a lagging by using an arching effect between earth particles and a sheet panel. Accordingly, the back earth pressure applied to an excavation space may be resisted by the self-weight of the lump of self-standing earth.
  • construction may be efficient and economical, compared to a conventional sheet pile.
  • the reinforced self-supported retaining wall structure using an arching effect is located at the back side of an excavation space, the structure does not interfere with an excavation work so that use of a large excavation space may be possible. Accordingly, an excavation work in a small space in a downtown area where tall buildings are densely arranged is made easy and efficient.
  • connection portion of the sheet panel becomes a combined section by the upper and lower fixing devices, not only rigidity is improved but also the structures of the upper and lower fixing devices are simplified. Accordingly, the assembly and disassembly of the sheet panel connection portion is made easy and the collection of the installed sheet panels after the completion of the construction is made easy, so that construction and collection of sheet panels is efficient and economical.
  • the construction method of excavations using a reinforced self-supported retaining wall structure according to the present invention comprises:
  • the upper fixing device 50a is coupled and fixed to the upper end of the connection portion of the sheet panel 20 by using the coupling bolt 56a passing through the sheet panel 20, the attachment pad 52a, and the coupling plate 54a when the attachment pad 52a and the coupling plate 54a are sequentially located at both sides of the sheet panel 20.
  • the lower fixing device 50b includes the rotation plate 54b formed in the second cut portion 56b that rotates around the hinge shaft 58b by an elastic force of the spring 59b so that the upper end inclined surface 542b of the rotation plate 54b is caught by the hook step 526b of the first cut portion 52b.
  • the rotation plate 54b includes the upper end inclined surface 542b formed on the upper end of the rotation plate 54b, the lower end rotation groove 546b formed in the lower end thereof, and the vertical insertion groove 544b formed in the vertical surface thereof.
  • the sheet panel 20 is continuously assembled by inserting the sheet panel protruding portion 22a into the soldier pile insertion portion 14a installed on the ground (or the reversed S-shaped bent portion 22b' of the sheet panel 20 into the S-shaped bent portion 14b of the soldier pile 10), and then the compression support plate protruding portion 46a is inserted into the sheet panel insertion portion 22a'.
  • the lower fixing device 50b is structurally installed by installing the sheet panel 20 having the second cut portion 56b formed therein after installing the sheet panel 20 having the first cut portion 52b formed therein.
  • the removal of the installed sheet panel 20 has the same order as above. That is, after the sheet panel 20 having the first cut portion 52b is first removed, the sheet panel 20 having the second cut portion 56b is removed. If the order is reversed, neither the installation nor the removal is possible.
  • the rotation plate 54b rotating around the hinge shaft 58b is vertically guided by the sheet panel insertion portion 22a' having a vertical shape so as to be in a vertical state (see FIG. 15 ).
  • the hinge shaft 58b is inserted into the shaft point 582b.
  • the rotation plate 54b maintaining the vertical state meets the first cut portion 52b, as illustrated in FIG. 16 , the rotation plate 54b is rotated toward the first cut portion 52b by the elastic force of the spring 59b fixed to the spring mounting device 562b so that the upper end inclined surface 542b of the rotation plate 54b is caught by the hook step 526b of the first cut portion 52b.
  • the vertical insertion groove 544b of the rotation plate 54b inserted in the second cut portion 56b of the sheet panel 20 and the lower end rotation groove 546b inserted in the lower end portion of the second cut portion 56b are respectively released from the second cut portion 52b and the lower end portion of the second cut portion 56b, together with the rotation of the rotation plate 54b.
  • the lower end rotation groove 546b of the rotation plate 54b is formed to have a depth such that the rotation thereof is not hindered by the second cut portion 56b of the sheet panel 20.
  • the lower fixing device 50b is firmly fixed in a state that the upper end inclined surface 542b of the rotation plate 54b is caught by the hook step 526b of the first cut portion 52b.
  • the spring 59b is inserted into the spring insertion groove 548b of the rotation plate 54b and fixed to the spring mounting device 562b.
  • the rotation plate 54b In the disassembly of the lower fixing device 50b, when the upper end inclined surface 542b of the rotation plate 54b is caught by the hook step 526b of the first cut portion 52b, if the sheet panel 20 having the first cut portion 52b is first pulled up for disassembly, the rotation plate 54b is guided to be vertical by the sheet panel insertion portion 22a' having a vertical shape so as to be in a vertical state. While the sheet panel 20 having the first cut portion 52b is pulled up, the rotation plate 54b maintains a vertical state and the vertical insertion groove 544b and the lower end rotation groove 546b of the rotation plate 54b are inserted again into the second cut portion 56b of the sheet panel 20.
  • the rotation plate 54b hardly interferes with the sheet panel 20 having the first cut portion 52b so that the disassembly of the sheet panel 20 having the first cut portion 52b is made easy. Since the lower fixing device 50b has a simple structure that is easy to be assembled or disassembled, the assembly and disassembly work is efficient and rigidity of the serial sheet panels 20 is improved.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
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  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
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  • Bulkheads Adapted To Foundation Construction (AREA)
EP10846233.4A 2010-02-20 2010-12-09 Verstärkte selbsttragende stützwandstruktur mit nutzung der bogenauswirkung und konstruktionsverfahren für aushub damit Withdrawn EP2537988A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020100015443A KR20110095980A (ko) 2010-02-20 2010-02-20 아칭효과를 이용한 보강형 자립식 흙막이 구조체 및 이를 이용한 지중굴착 시공방법
PCT/KR2010/008812 WO2011102595A2 (ko) 2010-02-20 2010-12-09 아칭효과를 이용한 보강형 자립식 흙막이 구조체 및 이를 이용한 지중굴착 시공방법

Publications (2)

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EP2537988A2 true EP2537988A2 (de) 2012-12-26
EP2537988A4 EP2537988A4 (de) 2015-11-18

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EP10846233.4A Withdrawn EP2537988A4 (de) 2010-02-20 2010-12-09 Verstärkte selbsttragende stützwandstruktur mit nutzung der bogenauswirkung und konstruktionsverfahren für aushub damit

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US (1) US20120076594A1 (de)
EP (1) EP2537988A4 (de)
JP (1) JP5501478B2 (de)
KR (1) KR20110095980A (de)
CN (1) CN102713079B (de)
WO (1) WO2011102595A2 (de)

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CN102713079A (zh) 2012-10-03
EP2537988A4 (de) 2015-11-18
JP2013514472A (ja) 2013-04-25
US20120076594A1 (en) 2012-03-29
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JP5501478B2 (ja) 2014-05-21

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