JP2016205119A - Segment and construction method for immersion structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a decrease in construction efficiency by enabling adaptation to large-section construction.SOLUTION: A segment (5), which constitutes an immersion structure (100) buried in ground, includes an outside piece (51) that forms an exterior wall of the immersion structure (100), an inside piece (52) that forms an interior wall of the immersion structure (100), and a connection piece (53) for connecting the outside and inside pieces (51) and (52) together.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a segment constituting a subsidence structure and a method for constructing the subsidence structure.

  In order to construct subsidence structures such as shafts and pier reinforcements, a ring body is constructed by connecting a plurality of segments, and a plurality of substructures that are connected by overlapping the ring bodies in the axial direction are submerged in the ground. There is a known construction method.

  When sinking a submerged object in the ground, provide a cutting edge ring on the ground surface of the construction site, excavate the ground inside the cutting edge ring, and then turn the top edge of the cutting edge ring toward the ground using a sinking device. Press and sink the blade ring into the ground. After sinking the blade ring to a certain depth, another ring body is connected to the upper end of the blade ring, the inside of the ring body is excavated, and the upper end of the ring body is pressed toward the ground by the sinking device, The ring body is set in the ground. In this way, by repeating the assembly of the sinking body by connecting the plurality of ring bodies, the excavation of the ground, and the pressing of the sinking body in order, the sinking body can be sinked in the ground.

  A segment for constructing a ring body including a curved plate that serves as a wall surface of the subsidence structure, main girders provided at the upper and lower ends of the plate, and joints provided at the left and right ends of the plate Is known. The plate, the main beam, and the joint are all formed in a plate shape (see, for example, Patent Document 1).

  Further, a sinking body in which a press-fit mold frame, a reinforcing bar, and a steel structure as an outer frame are arranged as an inner frame from the inside is known. Concrete is driven into the space where the reinforcing bars are arranged between the press-fitting mold and the double frame of the steel structure. Only the steel structure is integrated with the reinforcing bar (see, for example, Patent Document 2).

Japanese Patent No. 3967494 Japanese Patent No. 4313871

  In recent years, there has been an increasing demand for construction of subsidence structures with large cross sections. When it comes to construction with a large cross section, the segments that make up the subsidence structure also need to be enlarged to ensure the necessary cross-sectional performance.

  However, transportation equipment such as trucks and trailers is limited in the size that can be loaded, so it is difficult to transport a segment to the construction site after creating the segment simply by making the segment of the conventional structure larger. . In addition, it is not preferable to create a submerged structure from scratch at the construction site because it causes a reduction in construction efficiency.

  Then, this invention is made | formed in view of the said problem, and can provide the construction method of the segment which can respond to construction with a large cross section, and can suppress the fall of construction efficiency, and a subsidence structure. For the purpose.

  In order to solve the above-mentioned problem, the present invention is a segment constituting a subsidence structure embedded in the ground, wherein an outer piece forming an outer wall of the subsidence structure and an inner wall of the subsidence structure are formed. It comprises an inner piece, and a connecting piece that connects the outer piece and the inner piece.

  Each of the outer piece and the inner piece includes a plate that forms a wall surface, and a main girder erected on an upper end portion and a lower end portion of the plate, and the main girder of the outer piece and the main piece of the inner piece, respectively. It is preferable that the main girder is connected by the connecting piece.

  It is preferable that the connection piece is connected to the main beam with a space between the plate and the plate.

  It is preferable that the main girder or the plate is provided with a connector for connecting the connection pieces.

  It is preferable that a groove is formed on the outer surface of at least one main beam.

  It is preferable that the main girder of the outer piece and the main girder of the inner piece are integrally formed.

  It is preferable that a through hole communicating with the space between the outer piece and the inner piece is formed in the main beam.

  Each of the outer piece and the inner piece includes a plate that forms a wall surface, and a joint erected on the left end and the right end of the plate, and the joint of the outer piece and the joint of the inner piece Are preferably connected by the connecting piece.

  It is preferable that the connecting piece that connects the joint of the outer piece and the joint of the inner piece partitions a space between the plate of the outer piece and the plate of the inner piece.

  It is preferable that the coupling or the plate is provided with a coupling for coupling the coupling piece.

  It is preferable that a connector for connecting adjacent plates is provided at the left end and the right end of the plate.

  In order to solve the above-mentioned problem, the present invention is a construction method of a subsidence structure in which the above-described segments are assembled to construct a subsidence structure, and the step (A) of assembling an annular ring body by connecting the segments. And (B) placing concrete in the space between the outer piece and the inner piece of the ring body assembled in the step (A), and after the step (B), Excavating the inner ground, applying a force from above the ring body, sinking the ring body into the ground (C), and from the step (A) to the step (C) to a predetermined depth Repeating step (D).

  In order to solve the above-mentioned problem, the present invention is a construction method of a subsidence structure in which the above-described segments are assembled to construct a subsidence structure, and the step (A) of assembling an annular ring body by connecting the segments. The step (B) of placing concrete in the space between the outer piece and the inner piece of the ring body assembled in the step (A), and the step (A) after the step (B) (C) for assembling an annular ring body by connecting the segments on the upper end surface of the ring body assembled in step), and excavating the ground inside the ring body after the step (C), Applying a force from above the ring body assembled in the step (C) to sink the ring body assembled in the step (A) into the ground (D), and assembling in the step (C) A step (E) of placing concrete in a space between the outer piece and the inner piece of the ring body, and a step (F) of repeating the step (A) to the step (E) to a predetermined depth. It is characterized by having.

  In order to solve the above-mentioned problem, the present invention is a construction method of a subsidence structure in which the above-described segments are assembled to construct a subsidence structure, and the step (A) of assembling an annular ring body by connecting the segments. And, at the upper end surface of the ring body assembled in the step (A), connecting the segments to assemble an annular ring body, and connecting the ring body assembled in the step (A) (B) After the step (B), the step (C) of placing concrete in the space between the outer piece and the inner piece of the ring body assembled in the step (A), and the step (C ) After excavating the ground inside the ring body, applying a force from above the ring body assembled in the step (B), the ring body assembled in the step (A) Characterized in that it has a step of sinking (D), and the step of repeating the up step (D) from a predetermined depth the step (B) (E), the inside.

  Before the step (A), it is preferable to assemble a workbench ring that serves as a workbench when the segments are assembled.

  It is preferable to apply a force above the outer piece when the ring body is submerged in the ground.

  After sinking the ring body to a predetermined depth, a step of constructing a concrete layer at the bottom inside the ring body, and a step of draining ground water inside the ring body after constructing the concrete layer It is preferable.

  Before the ring body is sunk, it is preferable to have a step of installing a sunk anchor that takes a reaction force when the ring body is sunk in the ground.

  ADVANTAGE OF THE INVENTION According to this invention, it can respond to the construction in a large cross section and can suppress the fall of construction efficiency.

It is the schematic front view which looked at a part of submerged structure laid in the ground. It is a top view of a double ring. It is a perspective view of the segment which comprises a double ring. FIG. 4 is a plan view of the segment of FIG. 3. It is sectional drawing of the segment on the VV line | wire of FIG. It is a figure which shows the method which concerns on 1st Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 1st Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 1st Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 1st Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 1st Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 1st Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 2nd Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 2nd Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 2nd Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 3rd Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 3rd Embodiment which builds a subsidence structure. It is a figure which shows the method which concerns on 3rd Embodiment which builds a subsidence structure. It is a perspective view of the modification of the segment which comprises a double ring. It is a perspective view of another modification of the segment which comprises a double ring.

  A preferred embodiment of the present invention will be described with reference to the drawings. In addition, embodiment shown below is one illustration and can take a various form in the scope of the present invention.

FIG. 1 is a schematic front view of a part of a submerged structure 100 submerged in the ground, showing an example in which the subsidence structure 100 is applied to a shaft. FIG. 2 is a plan view of the double ring 44 constituting the ring body 4. FIG. 3 is a perspective view of the segment 5 constituting the double ring 44. FIG. 4 is a plan view of the segment 5 of the double ring 44. FIG. 5 is a cross-sectional view of the segment 5 shown in FIG. 4 on the VV line.
[Configuration of the submerged structure]
As shown in FIG. 1, the subsidence structure 100 is provided at an excavation start point or an intermediate point of a tunnel T built in the ground by a shield method or the like, and a space S inside the subsidence structure 100 is a shield machine. It becomes a conveyance path and a vent.

As shown in FIG. 1, the substituting structure 100 includes a substituting body 1 submerged in the ground, a bottom plate part 2 provided on the inner bottom of the substituting body 1, and a subsidence body 1 being submerged in the ground. And a sinking anchor 3 used in the above.
<Sinked body>
As shown in FIG. 1, the sinking body 1 is constructed in a cylindrical shape, and is set in the ground so that its axis is along the vertical direction. The sinking body 1 is assembled by connecting a plurality of ring bodies 4 having an annular shape in plan view in the axial direction. The ring body 4 constituting the set-up body 1 is configured by stacking a blade ring 41, a guide ring 42, a workbench ring 43, and a double ring 44 in the vertical direction.

  The blade edge ring 41 is a ring body provided at the lowermost end of the settling body 1 and has a blade edge at the lower end thereof. The blade ring 41 has the tooth tip (tip) on the outside. A plurality of guide rings 42 are connected to the upper end of the blade ring 41 to guide the sinking of the sinking body 1. The work table ring 43 is connected to the upper end of the guide ring 42. The worktable ring 43 is formed such that the upper end surface is larger than the lower end surface, and the upper end surface is formed so as to project inside the worktable ring 43. The upper end surface of the work table ring 43 is formed to have a size that allows at least the double ring 44 to be placed thereon. The double ring 44 is connected to the upper end of the work table ring 43. Above the work table ring 43, a double ring 44 is provided in a plurality of stages.

  The guide ring 42 provided between the blade ring 41 and the work table ring 43 is formed so that the width of the end surface in the axial direction gradually increases from the blade ring 41 toward the work table ring 43. It is more preferable. That is, it is preferable that the upper guide ring 42 is formed such that the width of the upper end surface thereof is closer to the width of the work table ring 43.

In the rings 41 and 42 adjacent to each other in the vertical direction, the segments of the upper ring 42 and the segments of the lower ring 41 are shifted in the circumferential direction of the rings 41 and 42 and arranged in a staggered manner. This arrangement also applies to the ring 42 and ring 43, the ring 43 and ring 44, and the rings 44 and 44. The ring body 4 is formed by connecting and assembling segments as shown in FIG. 2 along the wall surface direction.
<Double ring segment>
As shown in FIG. 2, the double ring 44 of the ring body 4 is formed in an annular shape by connecting a plurality of segments 5. The double ring 44 is formed by connecting, for example, 20 segments 5.
Moreover, it is preferable that the width of the segment 5 seen from the radial direction of the double ring 44 is within a range of 3.0 to 15.0% with respect to the final outer diameter of the set-up structure 100, and in particular. If it is within the range of 8.0 to 10.0%, it is advantageous in that it counters buoyancy caused by groundwater in the ground when the segment 5 is set.
The material of the segment 5 is not particularly limited, but is preferably a steel material.

As shown in FIG. 3, the segment 5 of the double ring 44 includes an outer piece 51 that forms the outer wall of the sinking structure 100, an inner piece 52 that forms the inner wall of the sinking structure 100, and the outer piece 51 and the inner piece. A connection piece 53 that connects
The height of the outer piece 51 and the inner piece 52 as seen from the thickness direction of the segment 5 is preferably in the range of 0.5 to 2.5 m, and in particular, Occupational Safety and Health Rules Article 552, Paragraph 1, Item 4 Based on the provisions of No. A, it is good to be 0.85m or more. More specifically, it is preferable from the viewpoint of workability to set the heights of the outer and inner pieces 51 and 52 to 0.9 to 1.5 m, particularly 1.25 m.
In addition, the distance between the outer piece 51 and the inner piece 52 is preferably 0.4 m or more based on the provisions of Articles 570 and 571 of the Industrial Safety and Health Rules. Specifically, the interval between the outer and inner pieces 51 and 52 can be set within the range of 0.4 to 2.5 m, more specifically within the range of 1.0 to 2.0 m. From the viewpoint of sex.

(Outside piece)
The outer piece 51 includes a rectangular plate 61 that is curved in an arc shape that forms the outer wall surface of the double ring 44, two main girders 62 erected on the outer edge along the curvature of the plate 61, and two Two joints 63 erected at both ends in the longitudinal direction of the main beam 62 so as to connect both ends of the main beam 62, and the inner surface side of the plate 61 parallel to the joint 63 so as to connect between the two main beams 62 A rib 64 provided on the plate 61, a connector 65 provided on the plate 61, and a connector 66 provided on the main beam 62.

  As shown in FIG. 1, the outer piece 51 is installed above the blade ring 41. Specifically, the outer peripheral surfaces of the blade ring 41 and the outer piece 51 are on the same diameter of the sinking body 1.

  The main girder 62, the one joint 63, and the rib 64 may all be joined to the plate 61 by welding, or a part thereof may be formed integrally with the plate 61. The other joint 63 may be joined to the main beam 62 by welding, or a part thereof may be formed integrally with the main beam 62.

  As shown in FIG. 4, the plate 61 forms the outer wall surface of the double ring 44.

  As shown in FIG. 5, the plate 61 is joined to the end face of the main beam 62 so as to connect the two main beams 62 and on the radially outer side of the double ring 44.

Returning to FIG. 3, connecting members 65 are provided at both ends in the circumferential direction of the plate 61 along the axial direction of the segment 5. One end of the connector 65 is joined to the plate 61 by welding or the like, and the other end is formed in a bowl shape. The other end of the bowl shape protrudes in the circumferential direction from the main surface of the joint 63. The segments 5 are connected to each other by engaging the connecting tool 65 provided on the plate 61 of the adjacent segment 5 with the tip portions. In other words, the segment 5 is connected to the segment 5 adjacent in the circumferential direction by connecting the connector 65 to the flanged other end of the connector 65 of the segment 5 adjacent in the circumferential direction at the other end of the flange shape. Can do.
The tensile strength of the connector 65 is preferably equal to or higher than the tensile strength of the plate 61.

  The connecting tool 65 may be joined to the plate 61 as a separate member by welding, or may be formed integrally with the plate 61.

  As shown in FIGS. 3 and 5, the main girder 62 is erected on the upper end portion and the lower end portion of the plate 61. Each main girder 62 is formed with a plurality of through holes 62a through which bolts are inserted at predetermined intervals along the longitudinal (extending) direction. Here, the through holes 62a of the two main girders 62 are formed so that the through holes 62a penetrate each other along the same axis parallel to the axis of the double ring 44, and the double rings 44 are stacked vertically. In this case, the through holes 62a of the main girders 62 are formed to face each other. When the double rings 44 are connected to each other, the main girders 62 of the double rings 44 adjacent to each other in the vertical direction are abutted, bolts are inserted into both through holes 62a, and tightened with nuts, so that the adjacent double rings 44 can be connected and the sinking body 1 can be constructed | assembled.

  Grooves 62 b along the longitudinal direction of the main girder 62 are formed on the outer surfaces of the two main girder 62 erected on the upper end of the plate 61. The groove 62b is provided with an elastically deformable material such as rubber in order to seal the gap between the double rings 44 stacked in the vertical direction. When the adjacent segments 5 are connected to form the double ring 44, the grooves 62b may communicate with each other to form an annular groove, or may be completed in each segment 5. The groove 62b may be formed only on the outer surface of the one main beam 62.

  As shown in FIGS. 3 and 4, a notch 67 is formed at one end of the main beam 62. Specifically, the notch 67 is formed at one end of the main beam 62 on the radially outer side of the double ring 44. The notch 67 has an arcuate wall 68, and the arcuate wall 68 connects the two main girders 62 in the axial direction of the double ring 44. Further, the wall 68 has one end connected to the connector 65 and the other end connected to the joint 63 in the width direction (short direction), and is preferably joined by welding.

  When the segment 5 is connected to the adjacent segment 5, the notch 67 provides a space for connecting the connecting devices 65.

  As shown in FIG. 3, the joint 63 is erected between both ends of the two main girders 62 at both ends of the main girder 62 and one of the left and right ends of the plate 61.

  As shown in FIGS. 3 and 4, the ribs 64 are erected on the inner peripheral surface of the plate 61 in parallel to the joint 63 with a predetermined interval along the bending direction (longitudinal direction) of the plate 61. ing. Specifically, the two ribs 64 make a pair, and are provided at equal intervals in the circumferential direction from the central axis of each through hole 62 a of the main girder 62. Moreover, the rib 64 may be joined to the back surface side of the main girder 62 where the groove 62b is not formed by welding.

  The rib 64 shown in FIG. 3 is a profile member having a T-shaped cross section, but the cross-sectional shape is not limited as long as the reinforcing function of the segment 5 is satisfied.

  As shown in FIG. 3 and FIG. 4, a plurality of connectors 66 are provided side by side along the longitudinal direction of the main girder 62 (the direction along the edge curved in an arc shape). Further, as shown in FIG. 5, the connector 66 is provided so as to connect the upper and lower main girders 62, and is constant between one end portion of the main girders 62 in the longitudinal direction and both end portions of the main girders 62. A plurality are provided for each interval. Here, since the connecting piece 53 of the adjacent segment 5 is provided at the other end in the longitudinal direction of the main girder 62 (the side where the notch 67 is provided), the connecting tool 66 is not provided.

One end of the connector 66 is joined to the main girder 62 by welding or the like, and the other end is formed in a hook shape so as to protrude from the inner edge of the main girder 62. The connection tool 66 is connected to the connection piece 53, and the outer piece 51 and the inner piece 52 can be connected by engaging one end of the connection tool 66 and the connection piece 53.
Further, the connecting tool 66 may be connected to the joint 63.
Note that the number of the couplers 66 is three in the illustrated embodiment, but is not particularly limited.

(Inner piece)
The inner piece 52 includes a rectangular plate 71 formed in an arc shape that forms the inner wall surface of the double ring 44, two main girders 72 erected on the outer edge along the curve of the plate 71, and two Two joints 73 erected at both ends in the longitudinal direction of the main beam 72 so as to connect both ends of the main beam 72 and the inner surface side of the plate 71 parallel to the joint 73 so as to connect between the two main beams 72 A rib 74 provided on the plate 71, a connector 75 provided on the plate 71, and a connector 76 provided on the main girder 72.

  The main beam 72, one joint 73, and the rib 74 may all be joined to the plate 71 by welding, or a part thereof may be formed integrally with the plate 71. The other joint 73 may be joined to the main beam 72 by welding, or a part thereof may be formed integrally with the main beam 72.

  As shown in FIG. 4, the plate 71 forms the inner wall surface of the double ring 44.

  As shown in FIG. 5, the plate 71 is joined to the end face of the main beam 72 so as to connect the two main beams 72 and radially inside the double ring 44.

Returning to FIG. 3, at both ends in the circumferential direction of the plate 71, a connector 75 is provided across the axial direction of the segment 5. One end of the connector 75 is joined to the plate 71 by welding or the like, and the other end is formed in a bowl shape. The other end of the bowl shape protrudes in the circumferential direction from the main surface of the joint 73. The segments 5 are connected to each other by engaging the connector 75 provided on the plate 71 of the adjacent segment 5 with the tip portions. That is, the segment 5 is connected to the segment 5 adjacent in the circumferential direction by connecting the connector 75 with the flanged other end of the connector 75 of the segment 5 adjacent in the circumferential direction at the other end of the flange shape. Can do.
The tensile strength of the connector 75 is preferably equal to or higher than the tensile strength of the plate 71.
In addition, when the segment 5 is connected to form the double ring 44, the resistance moment of the entire couplings 65 and 75 included in the double ring 44 is equivalent to 30 to 70% of the resistance moment of the entire double ring 44. It is preferable to do.

  The connecting tool 75 may be joined to the plate 71 as a separate member by welding, or may be formed integrally with the plate 71.

  As shown in FIGS. 3 and 5, the main girder 72 is erected on the upper end portion and the lower end portion of the plate 71. Each main girder 72 is formed with a plurality of through holes 72a through which bolts are inserted at predetermined intervals along the extending (longitudinal) direction. Here, the through holes 72a of the two main girders 72 are formed so that the through holes 72a penetrate each other along the same axis parallel to the axis of the double ring 44, and the double rings 44 are stacked vertically. The through holes 72a of the main girders 72 are formed so as to face each other. When the double rings 44 are connected to each other, the main beams 72 of the double rings 44 that are adjacent to each other in the vertical direction are abutted, and bolts are inserted into both through-holes 72a and tightened with nuts, thereby adjacent double rings 44 44 can be connected and the sinking body 1 can be constructed | assembled.

  Grooves 72 b along the longitudinal direction of the main girder 72 are formed on the outer surfaces of the two main girder 72 erected on the upper end of the plate 71. The groove 72b is provided with an elastically deformable material such as rubber in order to seal the gap between the double rings 44 stacked in the vertical direction. When the adjacent segments 5 are connected to form the double ring 44, the grooves 72b may communicate with each other to form an annular groove, or may be completed in each segment 5. The groove 72b may be formed only on the outer surface of the one main beam 72.

  As shown in FIGS. 3 and 4, a notch 77 is formed at one end of the main beam 72. Specifically, the notch 77 is formed at one end of the main beam 72 on the radially inner side of the double ring 44. The notch 77 has an arcuate wall 78, and the arcuate wall 78 connects the two main girders 72 in the axial direction of the double ring 44. The wall 78 has one end connected to the connector 75 and the other end connected to the joint 73 in the width direction (short direction), and is preferably joined by welding.

  When the segment 5 is connected to the adjacent segment 5, the notch 77 provides a space for connecting the connecting devices 75.

  As shown in FIG. 3, the joint 73 is erected between both ends of the two main girders 72 at both ends of the main girder 72 and both left and right ends of the plate 71.

  As shown in FIG. 4, the ribs 74 are erected on the inner peripheral surface of the plate 71 parallel to the joint 73 at a predetermined interval along the bending direction (longitudinal direction) of the plate 71. Specifically, the two ribs 74 form a pair and are provided at equal intervals in the circumferential direction from the central axis of each through hole 72a of the main girder 72. Moreover, the rib 74 may be joined to the back surface side of the main girder 72 where the groove 72b is not formed by welding.

  The rib 74 shown in FIG. 3 is a profile having a T-shaped cross section, but the cross-sectional shape is not limited as long as the reinforcing function of the segment 5 is satisfied.

  As shown in FIGS. 3 and 4, a plurality of coupling devices 76 are provided side by side along the longitudinal direction of the main beam 72 (the direction along the edge curved in an arc shape). Further, as shown in FIG. 5, the connector 76 is provided so as to connect the upper and lower two main girders 72, and is constant between one end portion of the main girders 72 in the longitudinal direction and both end portions of the main girders 72. A plurality are provided for each interval. Here, since the connecting piece 53 of the adjacent segment 5 is provided at the other end portion in the longitudinal direction of the main beam 72 (the side where the notch portion 77 is provided), the connecting tool 76 is not provided.

One end of the connecting device 76 is joined to the main girder 72 by welding or the like, and the other end is formed in a hook shape so as to protrude from the inner edge of the main girder 72. The connecting tool 76 connects the connecting piece 53, and the outer piece 51 and the inner piece 52 can be connected by engaging one end of the connecting tool 76 and the connecting piece 53.
Further, the connecting tool 76 may be connected to the joint 73.
Note that the number of the couplers 66 is three in the illustrated embodiment, but is not particularly limited.

(Connecting piece)
As shown in FIG. 4, the connecting piece 53 is connected to the main girders 62 and 72 with a space between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52. Specifically, the connection piece 53 is provided between the connection tool 66 of the main beam 62 and the connection tool 76 of the main beam 72 that are opposed to each other. The joint 63 of the outer piece 51 and the joint 73 of the inner piece 52 are connected by a connecting piece 53.

The connection piece 53 is formed in a plate shape like, for example, a linear steel sheet pile, and includes hook-shaped connection tools 53a at both ends thereof. The connecting piece 53 can connect the outer piece 51 and the inner piece 52 by engaging the connecting tool 53 a with the hook-shaped ends of the connecting tools 66 and 76.
The tensile strength of the connecting piece 53 is preferably equal to or higher than the tensile strength of the plates 61 and 71. When the segment 5 is connected to form the double ring 44, the resistance moment of the entire connection piece 53 included in the double ring 44 may correspond to about 40% of the resistance moment of the entire double ring 44. preferable.

Since there is a gap between the connecting piece 53 and the plates 61 and 71, more specifically between the connecting members 66 and 76, the double ring 44 is assembled after connecting the segments 5 and assembling the double ring 44. When the concrete C is placed in 44, the concrete C can be filled into the segment 5 through the gap between the connecting piece 53 and the plates 61 and 71. Thereby, the concrete C can be filled in the entire area of the segment 5 only by placing the concrete C from one place, and the work burden of placing the concrete C can be greatly reduced.
In addition, it is preferable that the connection tool 53a is integrally formed with the connection piece 53.

  Further, in order to make the adjacent segments independent even after the concrete is placed, the connection piece 53 connected to the joints 63 and 73 needs to be formed so as to completely block between the joint 63 and the joint 73.

<Bottom board>
As shown in FIG. 1, the bottom plate part 2 serves as a foundation of the subsidence structure 100 and prevents underground water from flowing into the subsidence body 1.

  The bottom board part 2 is constructed by, for example, underwater concrete. The bottom board part 2 is constructed so that the upper surface thereof is substantially along the horizontal plane.

<Sink anchor>
The sinking anchor 3 takes a reaction force on the ground when the sinking body 1 is pushed into the ground by applying force to the ring body 4 from above the uppermost ring body 4 in the step of sinking the sinking body 1 into the ground. is there. As shown in FIG. 1, the anchoring anchor 3 is embedded in and fixed to the ground excavated outside and below the settling position of the sinking body 1, and is connected to the fixing part 31. It has a connecting part 32 that extends to the ground surface along the wall surface and is connected to a stationary part (such as a base part) of a sinking device 90 (see FIG. 8) that pushes the ring body 4.

  The fixing unit 31 is formed of, for example, a grout poured into the excavated ground. The fixing unit 31 is constructed at a position deeper than the blade edge ring 41 outside the blade edge ring 41 at the lowermost end of the set-up body 1.

The connection part 32 is formed with the steel wire (wire rope), for example. The lower end portion of the connecting portion 32 is embedded and fixed in the fixing portion 31 by solidification of the grout, and the upper end portion is connected and fixed to the immovable portion of the settling device 90.
The fixing portion 31 and the connecting portion 32 are formed to extend on the same axis along a direction perpendicular to the ground surface.

<Method of constructing a submerged structure>
(First construction method)
Next, a first method for constructing the subsidence structure 100 by substituting the subsidence body 1 will be described with reference to FIGS. 6 to 11. Hereinafter, for convenience of explanation, a plurality of steps will be described in the same drawing.

  The construction method of the substituting structure 100 described below is a method useful for construction with a large cross section and a large depth.

  First, a plurality of excavation holes are formed using a rotary percussion (not shown) on the outside of the construction site where the sinking body 1 is constructed. The excavation hole is formed in an annular shape with a predetermined interval along the outer wall of the subsidence body 1 to be submerged. The excavation hole is formed to a position deeper than the lower end of the sinking body 1 along a direction perpendicular to the ground surface. A grout is injected into each of the formed excavation holes, and a connecting portion (wire rope) 32 is inserted into the excavation hole. At this time, the lower end portion of the connecting portion 32 is immersed in the grout. By fixing the grout, the fixing portion 31 and the connecting portion 32 fixed to the fixing portion 31 are constructed, and the installation of the sinking anchor 3 is completed.

  Next, the settling device 90 is installed at a construction location for constructing the settling body 1, and the upper end of the connecting portion 32 is connected to a non-moving portion (such as a leg portion) of the settling device 90. The sinking device 90 is configured by, for example, a hydraulic jack, and the ring body 4 can be set in the ground by pressing the uppermost ring body 4 toward the ground.

  Below the settling device 90, the blade ring 41 disposed at the lowermost end of the settling body 1 is installed. The ground inside the installed blade ring 41 is excavated by a clam shell 92 attached to the tip of the crawler crane 91, and when the excavation of the depth necessary to set the blade ring 41 in the ground is completed, the excavation is completed. The upper surface of the blade ring 41 is pressed toward the ground by the stopping and setting device 90, and the blade ring 41 is set in the ground. After the cutting edge ring 41 is set, the guide ring 42 is overlapped and connected to the upper side in the axial direction of the cutting edge ring 41. After the guide ring 42 is connected, the ground inside the guide ring 42 is excavated by the clam shell 92, and when excavation of the depth necessary for the subsidence of the guide ring 42 is finished, the excavation is stopped and the subsidence device 90 The upper surface of the guide ring 42 is pressed toward the ground, and the guide ring 42 is set in the ground. After the guide ring 42 is connected and set a predetermined number of times, the work table ring 43 is overlapped and connected to the upper side in the axial direction of the guide ring 42 (FIG. 6A). After the workbench ring 43 is connected, the ground inside the guide ring 42 is excavated by the clamshell 92, and when excavation of the depth necessary for the workbench ring 43 to be submerged into the ground is finished, the excavation is stopped and the subsidence device 90, the upper surface of the work table ring 43 is pressed toward the ground, and the work table ring 43 is set in the ground (FIG. 6B).

  The above is a pre-process for convenience of explanation.

  Next, in the first step shown in FIG. 7A, the segments 5 are connected to assemble the annular ring body 4. Specifically, the segment 5 is connected to the upper end surface projecting inside the work table ring 43 to form an annular double ring 44. After the formation of the double ring 44, concrete C is placed on the double ring 44 in the second step shown in FIG. Specifically, concrete C is placed in the space between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52.

  In the third step shown in FIG. 8A, after placing the concrete C, the ground inside the double ring 44 in the first step is excavated by the clam shell 92. When the excavation of the depth necessary for the subsidence of the double ring 44 into the ground is finished, the excavation is stopped, and the upper surface of the double ring 44 is pressed toward the ground by the subsidence device 90, so that the double ring 44 is grounded. Sink inside. Specifically, the upper part of the outer piece 51 of the segment 5 constituting the double ring 44 is pressed to sink the double ring 44 into the ground. After the double ring 44 is set, in the fourth step shown in FIG. 8B, the segment 5 is connected to form another double ring 44 on the upper side in the axial direction of the double ring 44 in the first step.

  After the formation of the double ring 44 in the fourth step, in the fifth step shown in FIG. 9A, concrete C is placed on the double ring 44 connected in the fourth step. Next, in the sixth step shown in FIG. 9 (b), the ground inside the double ring 44 in the fourth step is excavated by the clam shell 92, and is necessary for setting the double ring 44 in the fourth step in the ground. When the excavation of the depth is completed, the excavation is stopped, and the upper surface of the double ring 44 in the fourth step is pressed toward the ground by the settling device 90, and the double ring 44 in the fourth step is set in the ground.

  In the seventh step shown in FIGS. 10A and 10B, the above first to sixth steps are repeated to a predetermined depth. Thereby, all the ring bodies 4 required for constructing the sinking body 1 are connected and set, and the sinking of the sinking body 1 is completed as shown in FIG.

  In addition, when the blade ring 41 and the ring body 4 are set, a force is applied to the settling device 90 to rise due to the reaction force from the ground. The settling device 3 is connected to the settling device 90. So do not float up. In addition, when the settling device 90 is removed after the settling body 1 is set, the upper end portion of the connecting portion 32 is connected and fixed to a structure or ground near the ground surface.

  As shown in FIG. 11, after the setting of the sinking body 1 is completed, underwater concrete is placed on the bottom of the sinking body 1 to construct the bottom board portion 2. From the viewpoint of reinforcement in the lower portion (the blade edge ring 41, the guide ring 42, and the work table ring 43) of the sinking body 1, the upper surface of the base portion 2 is preferably at least above the work table ring 43.

As shown in FIG. 11 (a), immediately after the settling body 1 is set, the groundwater W is filled inside the settling body 1. Therefore, in the eighth step shown in FIG. A submersible pump (not shown) is installed in the groundwater W inside the body 1, and the groundwater W is discharged outside the settling body 1.
The subsidence structure 100 is constructed through the above first to eighth steps.

(Second construction method)
Next, a second method for constructing the subsidence structure 100 by substituting the subsidence body 1 will be described with reference to FIGS. Hereinafter, for convenience of explanation, a plurality of steps will be described in the same drawing. Also in the second method, the pre-process shown in FIG. 6 is the same as that in the first method, and therefore, the description will be omitted here and different points will be mainly described.

  After the previous step shown in FIG. 6, in a first step shown in FIG. 12A, the segments 5 are connected to assemble the annular ring body 4. Specifically, the segment 5 is connected to the upper end surface projecting inside the work table ring 43 to form an annular double ring 44. After the formation of the double ring 44, in the second step shown in FIG. 12B, concrete C is placed on the double ring 44 in the first step. Specifically, concrete C is placed in a space between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52.

  In the third step shown in FIG. 13 (a), after placing the concrete C in the second step, on the upper side in the axial direction of the double ring 44 in the first step, the segment 5 is connected to another double ring 44. Form. After the connection, in the fourth step shown in FIG. 13 (b), the ground inside the double ring 44 in the first step is excavated by the clam shell 92, and the depth required for the setting of the double ring 44 in the first step. When the excavation is finished, the excavation is stopped, and the sinking device 90 presses the upper side of the outer piece 51 of the double ring 44 in the third step to set the double ring 44 in the first step.

After the double ring 44 is set in the first step, concrete C is placed on the double ring 44 in the fourth step in the fifth step shown in FIG. In the sixth step shown in FIG. 14B, the above first to fifth steps are repeated to a predetermined depth. Thereby, all the ring bodies 4 necessary for constructing the sinking body 1 are connected and set, and the sinking of the sinking body 1 is completed.
The sixth and subsequent steps are the same as the eighth step of the first method.

(Third construction method)
Next, a third method of constructing the subsidence structure 100 by substituting the subsidence body 1 will be described with reference to FIGS. 15 to 17. Hereinafter, for convenience of explanation, a plurality of steps will be described in the same drawing. Also in the third method, the pre-process shown in FIG. 6 is the same as that in the first method, and therefore, the description will be omitted here and different points will be mainly described.

  After the previous step shown in FIG. 6, in a first step shown in FIG. 15A, the segments 5 are connected to assemble the annular ring body 4. Specifically, the segment 5 is connected to the upper end surface projecting inside the work table ring 43 to form an annular double ring 44. After forming the double ring 44, in the second step shown in FIG. 16B, the segment 5 is connected to form another double ring 44 on the upper side in the axial direction of the double ring 44 in the first step.

  After another double ring 44 is formed, concrete C is placed on the double ring 44 in the first step in the third step shown in FIG. Specifically, concrete C is placed in a space between the plate 61 of the outer piece 51 and the plate 71 of the inner piece 52. After the concrete C is placed, in the fourth step shown in FIG. 16 (b), the ground inside the double ring 44 in the first step is excavated by the clam shell 92, and the double ring 44 is set in the first step. When the excavation of the required depth is finished, the excavation is stopped and the upper part of the outer piece 51 of the double ring 44 in the second step is pressed by the settling device 90 to set the double ring 44 in the first step.

In the fifth step shown in FIGS. 17A and 17B, the above second to fourth steps are repeated to a predetermined depth. Thereby, all the ring bodies 4 necessary for constructing the sinking body 1 are connected and set, and the sinking of the sinking body 1 is completed.
The fifth and subsequent steps are the same as the eighth step of the first method.

<Action, effect>
According to the segment 5 that constitutes the subsiding structure 100 embedded in the ground as described above, the outer piece 51 that forms the outer wall of the substituting structure 100 and the inner piece 52 that forms the inner wall of the subsiding structure 100. And the connecting piece 53 for connecting the outer piece 51 and the inner piece 52, the outer piece 51 and the inner piece 52 are separately created and transported to the construction site even in the construction with a large cross section. It can be used as a large segment 5 connected by a connecting piece 53 at the construction site. Thereby, it can respond to the construction in a large section and can suppress the fall of construction efficiency. Further, the connecting piece 53 can be used as a shear reinforcement for the segment 5, and can prevent displacement and inclination between the outer piece 51 and the inner piece 52.
Furthermore, the height of the outer piece 51 and the inner piece 52 as viewed from the thickness direction of the segment 5 is in the range of 0.5 to 2.5 m, and the distance between both pieces 51 and 52 is 0.4 to. When the distance is within the range of 2.5 m, the assembling work in the segment 5 is facilitated, and erroneous fall of the worker from the inside of the segment 5 to the outside of the segment 5 can be surely prevented.
By setting the heights of the outer and inner pieces 51 and 52 in such a range, when assembling the segment 5, the scaffold for assembling work can be placed inside the double ring 44 (the space S of the later set structure 100). It is not necessary to prepare separately on the side to be. That is, the segment 5 itself can be used as a working scaffold.

  The outer piece 51 and the inner piece 52 include plates 61 and 71 that form wall surfaces, and main girders 62 and 72 that are erected on the upper and lower ends of the plates 61 and 71, respectively. Since the main girder 62 and the main girder 72 of the inner piece 52 are connected by the connecting piece 53, the mounting stability of the segments overlapping in the axial direction is improved.

  In addition, since the connecting piece 53 is connected to the main girders 62 and 72 with a space between the plates 61 and 71, after the double ring 44 is assembled, the concrete C passes through the space above the plate. Since it is placed between 61 and 71, the concrete placing work is facilitated.

  Moreover, since the couplings 66 and 76 which connect the connection piece 53 are provided in the joints 63 and 73 or the plates 61 and 71, the installation of the connection piece 53 becomes easy, and the work labor concerning construction | assembly of the segment 5 becomes easy. Is reduced.

  In addition, since the longitudinal ends of the plates 61 and 71 are completely separated from the adjacent segments 5 by the joints 63 and 73 and the plate-like connecting piece 53, they are adjacent in the circumferential direction even after the concrete is placed. Since the segments 5 to be constructed are not integrally constructed by the solidified concrete, the seismic isolation performance of the substituting structure 100 can be enhanced.

  In addition, since concrete is cast for each ring body stacked in the vertical direction of the subsidence structure 100, the segments 5 adjacent in the vertical direction are integrally constructed by solidified concrete even after the concrete is cast. Therefore, the seismic isolation performance of the subsiding structure 100 can be enhanced.

  Further, since a groove is formed on the outer surface of at least one main girder, it becomes easy to install a sealing material for maintaining the sealing performance, and the segments 5 that overlap in the vertical direction, that is, two in the axial direction are arranged. It is possible to provide the set-up body 1 having excellent sealing performance between the heavy rings 44.

  Moreover, since the main girder 62 of the outer piece 51 and the main girder 72 of the inner piece 52 are integrally formed, the shear strength can be further improved and the mounting stability of the segments overlapping in the axial direction is further increased. improves.

  Further, since the through hole communicating with the space between the outer piece 51 and the inner piece 52 is formed in the main girder 62, the concrete C placing work is facilitated.

  Each of the outer piece 51 and the inner piece 52 includes plates 61 and 71 that form wall surfaces, and joints 63 and 73 that are erected on the left and right ends of the plates 61 and 71, respectively. Since the joint 63 and the joint 73 of the inner piece 52 are connected by the connecting piece 53, the shear strength can be further improved.

  Moreover, since the couplings 66 and 76 which connect the connection piece 53 are provided in the joints 63 and 73 or the plates 61 and 71, the connection piece 53 for improving shear strength is used as the outer piece 51 and the inner piece. 52 can be easily connected.

  Moreover, since the connection tools 65 and 75 which connect the adjacent plates 61 and 71 are provided in the left end part and right end part of the plates 61 and 71, the adjacent segments 5 are connected, and the double ring 44 is connected. The overall strength can be improved.

  By the construction method of at least one of the subsidence structures 100 described above, the assembly efficiency of the subsidence structure 100 with greatly improved earthquake resistance is improved. Further, by placing the concrete C after placing it, it is possible to suppress segment displacement during the placing.

  In addition, since the work table ring 43 serving as a work table for assembling the segment 5 is assembled before the step (A), the double ring 44 can be easily assembled.

  Further, when the ring body 4 is sunk in the ground, a force is applied above the outer piece 51, so that the pressing force for sunk the ring body 4 is efficiently applied to the blade ring 41 via the outer piece 51. Can communicate well.

  Before the ring body 4 is sunk, it has a step of installing the sunk anchor 3 that takes the reaction force when the ring body 4 is sunk in the ground, so that the settling device 90 is prevented from being lifted when the sunk body 1 is laid. be able to.

<Modified example of double ring segment>
Next, a modified example of the segments constituting the double ring 44 will be described.
(Modification 1)
FIG. 18 is a plan view showing a first modification of the segment of the double ring 44.

About the segment 5A shown in FIG. 18, about the same structure as the segment 5, the same code | symbol is attached | subjected and description is abbreviate | omitted and it demonstrates centering on a different point below.
In addition, the same numerical value range as the segment 5 can be used about the same and similar component of the segment 5A as the said segment 5.

  As shown in FIG. 18, the segment 5A of the double ring 44 includes an outer piece 51A that forms the outer wall of the sinking structure 100, an inner piece 52A that forms the inner wall of the sinking structure 100, and the outer piece 51A and the inner piece 52A. And a connecting piece 53A for connecting the two.

  The outer piece 51A includes a rectangular plate 61A that is curved in an arc shape that forms the outer wall surface of the double ring 44, two main girders 62A that are erected on the outer edge along the curvature of the plate 61A, and two A joint 63A erected at one end in the longitudinal direction of the main girder 62A so as to connect both ends of the main girder 62A, and provided on the inner surface side of the plate 61A in parallel with the joint 63A so as to connect between the two main girders 62A. 66A. The main beam 62A, the joint 63A, and the coupling tool 66A may all be joined to the plate 61A by welding, or a part thereof may be formed integrally with the plate 61A.

  The joint 63A is formed in a plate shape like a linear steel sheet pile, for example, and is erected at both ends in the longitudinal direction of the main girder 62A. The joint 63A is different from the joint 63 of the segment 5 and extends between the plates 61A and 71A as an integral joint 63A. Fasteners 80A and 81A for enabling connection with the adjacent segment 5A at predetermined intervals in the axial direction of the double ring 44 at both ends in the radial direction of the double ring 44 of the joint 63A. For this purpose, it has a plurality of through holes (not shown). That is, the segment 5A is connected to each other by the fasteners 80A and 81A via the joint 63A and the joint 63A of the adjacent segment 5A.

  A plurality of coupling tools 66A are erected on the inner peripheral surface of the plate 61A. The couplers 66A are provided in parallel to each other. The connector 66A has a plurality of through holes (not shown) for a fastener 80A for connecting to a connection piece 53A described later at a predetermined interval in the axial direction of the double ring 44. That is, the connection tool 66A includes a connection mechanism with the connection piece 53A in addition to the reinforcing function of the segment 5A.

  The inner piece 52A includes a plate 71A, two main girders 72A, a joint 63A shared with the outer piece 51A, and a connector 76A. The plate 71A, the main girder 72A, the joint 63A, and the coupling tool 76A of the inner piece 52A have the same configuration as the corresponding components of the outer piece 51A, and thus description thereof is omitted.

  The connecting piece 53A is provided between the plates 61A of the outer piece 51A and the plate 71A of the inner piece 52A between both ends of the segment 5A in the bending direction. The connecting piece 53 </ b> A has a plurality of through holes (not shown) at predetermined intervals in the axial direction of the double ring 44. The connection piece 53A and the connection tools 66A and 76A are connected via fasteners 80A and 81A having bolts and nuts. Specifically, the connecting piece 53A is provided between the plates 61A and 71A so that the through holes thereof are aligned with the through holes of the couplers 66A and 76A, and bolts are inserted into both through holes to form nuts. Are connected to the connecting members 66A and 76A.

  When the double ring 44 is assembled by connecting adjacent segments 5A, four spaces that are completely partitioned by the connecting piece 53A and the joint 63A are formed between the outer piece 51A and the inner piece 52A. ing. After assembling the double ring 44 by connecting the segments 5A, when placing concrete in the double ring 44, the concrete is placed in each space.

(Modification 2)
FIG. 19 is a plan view of a second modification of the segment of the double ring 44.
In the segment 5B shown in FIG. 19, the same components as those of the segment 5 are denoted by the same reference numerals and description thereof is omitted. Hereinafter, different points will be mainly described.
In addition, the same numerical range as the segment 5 can be used about the component of the segment 5B which is the same and similar to said segment 5.

  The segment 5B of the double ring 44 includes an outer piece 51B that forms the outer wall of the sinking structure 100, an inner piece 52B that forms the inner wall of the sinking structure 100, and a connecting piece 53B that connects the outer piece 51B and the inner piece 52B. It is equipped with.

  The outer piece 51B stands up at one end in the longitudinal direction of the main girder 62B, a rectangular plate 61B that is curved in an arc shape that forms the outer wall surface of the double ring 44, a main girder 62B that is shared with the inner piece 52B. And a joint 63B shared with the inner piece 52B. Note that both the main beam 62B and the joint 63B may be joined to the plate 61B by welding, or a part thereof may be formed integrally with the plate 61B.

  The inner piece 52B includes a rectangular plate 71B that is curved in an arc shape that forms the inner wall surface of the double ring 44, a main beam 62B, and a joint 63B.

  Unlike the main girders 62 and 72 in the segment 5 and 62A and 72A in the segment 5A, the main girders 62B in the segment 5B are erected on the outer edges of the plate 61B and the plate 71B as an integral main girder 62B. That is, in the segment 51B, the main beam 62B bridges the plates 61B and 71B to connect the outer piece 51B and the inner piece 52B. A plurality of through holes H are formed in the main beam 62B at predetermined intervals along the longitudinal direction.

  The joint 63B in the segment 5B is formed in a plate shape like a linear steel sheet pile, for example, and is erected at one end in the longitudinal direction of the main girder 62B. Since the joint 63B of the adjacent segment 5B is provided at the other end of the main beam 62B, the joint 63B is not provided. Unlike the joint 63 of the segment 5 and the joints 63A and 73A in the segment 5A, the joint 63B extends as a single joint 63B between the plates 61B and 71B at one end of the segment 5B. An opening (not shown) is provided at both ends of the joint 63B in the radial direction of the double ring 44 for a connecting tool 65B for enabling connection with the adjacent segment 5B along the axial direction of the double ring 44. have. That is, the segment 5B is connected to the adjacent segment 5B by the connector 65B via the joint 63B. The joint 63B is joined to the left and right ends of the plates 61B and 71B and the main beam 62B by welding.

  One end of the coupler 65B is joined to the inner surface of the main girder 62B by welding, and the other end not welded to the main girder 62B is formed in a hook shape.

  The connecting piece 53B is erected on the inner peripheral surface of each plate between the plates 61B and 71B. Specifically, three connection pieces 53B are provided at equal intervals between both ends of the plates 61B and 71B, and both ends of the connection piece 53B are welded to the inner peripheral surfaces of the plates 61B and 71B, respectively. It is joined. Thereby, the outer piece 51B and the inner piece 52B are connected to each other.

  Here, in the segment 5B, a space is partitioned by the adjacent connecting piece 53B and the joint 63B. The through hole H of the main beam 72B is formed in the main beam 62B so as to communicate with each space one by one.

  When the segments 5B are connected to each other to assemble the double ring 44, the concrete is placed in the space through the through holes H.

<Others>
The present invention is not limited to the above embodiment. For example, the ring body is not limited to a circular shape in plan view, and may be formed in an elliptical shape in plan view (oval shape) or a polygonal shape in plan view.

  In addition, the outer piece and the inner piece of the double ring are not limited to being connected to each other, and may be integrally formed from the beginning.

  Further, the joint may be connected not only to the plate but also to a plate connector.

  The connecting piece 53 may be joined to the plates 61 and 71 by welding or the like without using the connecting tools 66 and 76. In this case, the space partitioned by each connecting piece 53 is a closed space.

  Of the connecting pieces 53, the connecting piece 53 that connects other than the joints 63 and 73 does not have to be the same height as the plates 61 and 71 and the joints 63 and 73, and the connection between the outer piece 51 and the inner piece 52 is not necessary. If it is sufficiently large, its shape, height, etc. can be freely changed. For example, by reducing the height of the connecting piece 53 that connects other than the joints 63 and 73 to be lower than that of the plates 61 and 71, the space between the outer piece 51 and the inner piece 52 is not completely partitioned, so that The concrete can be spread over the entire space between the outer piece 51 and the inner piece 52 just by placing the concrete from one place at the time of installation, and the weight of the segment 5 can be reduced.

  Moreover, the connection piece 53 which connects except the couplings 63 and 73 among the connection pieces 53 is not restricted to the above plate-shaped members, and may be a bar material such as a reinforcing bar. When such a configuration is adopted, the space between the outer piece 51 and the inner piece 52 is not completely partitioned, and the outer piece 51 and the inner piece can be formed only by placing concrete from one place when placing concrete. Concrete can be spread over the entire space between the pieces 52, and the weight of the segment 5 can be reduced.

1 Subsidiary body 2 Bottom plate part (concrete layer)
DESCRIPTION OF SYMBOLS 3 Set anchor 4 Ring body 41 Cutting edge ring 42 Guide ring 43 Worktable ring 44 Double ring 5 Segment 51 Outer piece 52 Inner piece 53 Connection piece 61,71 Plate 62,72 Main girder 62b, 72b Groove 63,73 Joint 65 , 75 connector 66,76 connector 100 sinking structure C concrete H through hole

Claims (18)

A segment that constitutes a submerged structure buried in the ground,
An outer piece forming an outer wall of the subsidence structure;
An inner piece forming an inner wall of the settling structure;
A connecting piece connecting the outer piece and the inner piece;
A segment characterized by comprising: Each of the outer piece and the inner piece includes a plate that forms a wall surface, and main girders that are erected on an upper end portion and a lower end portion of the plate,
The segment according to claim 1, wherein the main girder of the outer piece and the main girder of the inner piece are connected by the connecting piece.   The segment according to claim 2, wherein the connecting piece is connected to the main beam with a space between the connecting piece and the plate.   The segment according to claim 2 or 3, wherein the main girder or the plate is provided with a connector for connecting the connecting pieces.   The segment according to any one of claims 2 to 4, wherein a groove is formed on an outer surface of at least one main girder.   The segment according to any one of claims 2 to 5, wherein a main girder of the outer piece and a main girder of the inner piece are integrally formed.   The segment according to claim 6, wherein a through-hole communicating with a space between the outer piece and the inner piece is formed in the main girder. Each of the outer piece and the inner piece includes a plate that forms a wall surface, and a joint that is erected on a left end portion and a right end portion of the plate,
The segment according to claim 1, wherein the joint of the outer piece and the joint of the inner piece are connected by the connecting piece.   The connection piece that connects the joint of the outer piece and the joint of the inner piece partitions a space between the plate of the outer piece and the plate of the inner piece. segment.   The segment according to claim 8 or 9, wherein the joint or the plate is provided with a connector for connecting the connection pieces.   The segment according to any one of claims 2 to 10, wherein a connector for connecting adjacent plates is provided at a left end portion and a right end portion of the plate. It is a construction method of a subsidence structure which constructs a subsidence structure by assembling the segments according to any one of claims 1 to 11,
Connecting the segments and assembling an annular ring body; and
Placing concrete in the space between the outer piece and the inner piece of the ring body assembled in the step (A) (B);
After the step (B), excavating the ground inside the ring body, applying a force from above the ring body, and sinking the ring body in the ground;
A step (D) of repeating the step (A) to the step (C) to a predetermined depth;
A method for constructing a submerged structure characterized by comprising: It is a construction method of a subsidence structure which constructs a subsidence structure by assembling the segments according to any one of claims 1 to 11,
Connecting the segments and assembling an annular ring body; and
Placing concrete in the space between the outer piece and the inner piece of the ring body assembled in the step (A) (B);
After the step (B), on the upper end surface of the ring body assembled in the step (A), a step (C) of assembling an annular ring body by connecting the segments;
After the step (C), excavating the ground inside the ring body, applying a force from above the ring body assembled in the step (C), the ring body assembled in the step (A) A step (D) of submerging in the ground;
Placing concrete in a space between the outer piece and the inner piece of the ring body assembled in the step (C);
A step (F) of repeating the steps (A) to (E) to a predetermined depth;
A method for constructing a submerged structure characterized by comprising: It is a construction method of a subsidence structure which constructs a subsidence structure by assembling the segments according to any one of claims 1 to 11,
Connecting the segments and assembling an annular ring body; and
In the upper end surface of the ring body assembled in the step (A), the segment is connected to assemble an annular ring body, and the step (B) is connected to the ring body assembled in the step (A);
After the step (B), placing the concrete in the space between the outer piece and the inner piece of the ring body assembled in the step (A) (C),
After the step (C), excavating the ground inside the ring body, applying a force from above the ring body assembled in the step (B), the ring body assembled in the step (A) A step (D) of submerging in the ground;
A step (E) of repeating the step (B) to the step (D) to a predetermined depth;
A method for constructing a submerged structure characterized by comprising:   The construction method of a submerged structure according to any one of claims 12 to 14, wherein a workbench ring that serves as a workbench when the segments are assembled is assembled before the step (A).   The method for constructing a submerged structure according to any one of claims 12 to 15, wherein a force is applied above the outer piece when the ring body is submerged in the ground. After sinking the ring body to a predetermined depth, building a concrete layer on the bottom inside the ring body;
Draining the groundwater inside the ring body after the construction of the concrete layer;
The construction method of a subsidence structure according to any one of claims 12 to 16, characterized by comprising:   18. The method according to claim 12, further comprising a step of installing a sinking anchor that takes a reaction force when the ring body is set in the ground before the ring body is set down. To construct a subsidized structure.

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