JP5169638B2 - Construction method of underground structure - Google Patents

Construction method of underground structure Download PDF

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Publication number
JP5169638B2
JP5169638B2 JP2008223894A JP2008223894A JP5169638B2 JP 5169638 B2 JP5169638 B2 JP 5169638B2 JP 2008223894 A JP2008223894 A JP 2008223894A JP 2008223894 A JP2008223894 A JP 2008223894A JP 5169638 B2 JP5169638 B2 JP 5169638B2
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underground
construction
main
tunnel
ground
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JP2010059621A (en
Inventor
眞弘 佐藤
昌之 山中
昌美 平田
淳一 平尾
啓一郎 北出
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株式会社大林組
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Description

The present invention also acts a large buoyancy, and resistance to the buoyancy, a method for the construction of underground structures that can suppress lifting.

Conventionally, when an underground structure is constructed, there is a method of constructing an underground wall so as to surround the underground structure and to construct the underground structure so as to be integrated with the underground wall. It is used.
Buoyancy acts on such underground structures due to groundwater. Therefore, a method of increasing the dead weight of the underground structure so as to resist buoyancy, a method of forming a bottom expansion portion on the underground wall, and resisting by the support pressure of the bottom expansion portion (see, for example, Patent Document 1), a permanent anchor A method of fixing to the ground (for example, see Patent Document 2) is used.
JP 2000-178966 A JP-A-9-328771

  In recent years, underground structures with a large depth and a large section have been planned. In such a deep underground structure, the volume of the portion lower than the groundwater level of the underground structure is increased, so that the buoyancy acting on the underground structure is also increased. In such a case, there is a possibility that the above method cannot sufficiently resist buoyancy.

  The present invention has been made in view of the above problems, and the purpose of the present invention is that even when a large buoyancy acts on an underground structure such as an underground structure having a large depth and a large cross section. It is to be able to resist buoyancy.

  The underground structure construction method of the present invention includes an underground structure body, an underground wall constructed integrally with the underground structure body, and a strip in the horizontal direction on the surface of the underground wall. An underground structure construction method comprising: a projecting portion formed to extend and projecting outward from a surface of the underground wall, wherein the underground wall is constructed to construct the underground wall; A tunnel drilling step for drilling a tunnel along the outer periphery of the underground wall at a depth corresponding to the projecting portion of the ground; and the ground integrally with the underground wall inside the underground wall And a projecting part construction step of constructing the projecting part by constructing a concrete structure in the tunnel so as to be integrated with the underground structure main body while constructing the middle structure main body. And

  In the above underground structure building method, in the projecting portion building step, the inside of the tunnel and the inside of the underground wall are communicated, and the underground structure main body and the concrete structure are communicated through the communicated portion. And may be constructed integrally.

Further, in the underground wall construction step, a connecting rebar in which corrugated panels having openings are embedded in the vicinity of the inner and outer surfaces of the underground wall at a height corresponding to the tunnel, and joint hardware is connected to both ends. Embedded in such a manner that the fitting hardware is disposed so as to contact the opening of the corrugated panel embedded in the front and back surfaces, respectively, and in the projecting portion construction step, the portion on the underground wall side of the tunnel is removed. Exposing the corrugated panel on the outside embedded in the underground wall, coupling a reinforcing bar to the joint hardware from the inside of the tunnel through the opening of the corrugated panel on the outside, and in the tunnel so that the reinforcing bar is embedded Concrete is placed on the wall to construct the protruding portion, and the inner corrugated panel is exposed, and the joint is passed through the inner corrugated panel opening from the inside of the underground wall. Hardware Rebar and joints, concrete and Da設 may be constructed the underground structure body such that the rebar is embedded.
Moreover, you may provide the ground improvement step which improves the ground of the ground wall side surrounding the tunnel before the projecting portion construction step.
The above-mentioned ground improvement means that the ground can be expected to be water-stopping and excavation stability.

  According to the present invention, since the protrusion is constructed on the outer periphery of the underground structure using the tunnel, the vertical projection area of the protrusion can be increased by increasing the cross section of the tunnel. Thereby, since a protrusion part can receive a larger support pressure than the surrounding ground, even if a big buoyancy acts on an underground structure, it can resist this.

Hereinafter, an embodiment of the underground structure of the present invention will be described in detail with reference to the drawings.
FIG. 1: shows the structure of the underground structure 1 of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). The underground structure 1 of the present embodiment is a deep underground structure whose depth exceeds 50 m, and as shown in FIG. 1, the underground continuous wall 20 formed in the ground in a rectangular shape in plan view. And a projecting portion 30 projecting outward along the lower part of the underground continuous wall 20, and the underground structure main body 10 built inside the underground continuous wall 20.

  The underground structure main body 10 is, for example, a basement part of a building, and includes a reinforced concrete base portion 11 and a side wall portion 12. The underground structure main body 10 is constructed such that the side wall portion 12 is integrated with the underground continuous wall 20, and the foundation portion 11 is integrated with the protruding portion 30.

The projecting portion 30 is a reinforced concrete structure, and is constructed so as to extend horizontally from a height corresponding to the base portion 11 of the underground structure main body 10 and project outward. As will be described later, the projecting portion 30 cuts a shield hole horizontally along the outer periphery of the underground continuous wall 20 by a shield machine, and a portion of the shield hole on the underground structure body 10 side and the underground continuous wall 20. A part of the structure is removed, and concrete is placed inside the shield hole so as to be integrated with the underground structure main body 10. For this reason, the protrusion width from the underground continuous wall 20 of the protrusion 30 is substantially equal to the diameter of the hole drilled by the shield machine. As a shield machine, for example, there is a machine that can drill a large-diameter hole exceeding 10 m, and the protruding width of the protruding portion 30 can be 10 m or more.
A standing hole 40 for starting a shield machine to be described later is constructed at the corner of the underground continuous wall 20, and the standing hole 40 is backfilled.

Incidentally, the protruding width of the protruding portion 30, the product of the sum of the vertical projected area, long-term strength of the ground (100t / m 2 ~300t / m 2) is equal to or greater than the buoyancy acting on the underground structure 1 It is good to decide as follows.

  The underground continuous wall 20 is constructed along the outer periphery of the underground structure main body 10 in a plan view, and the lower end thereof reaches a position deeper than the underground structure main body 10.

  Buoyancy acts on such underground structure 1 by groundwater in the ground. In particular, in the deep underground structure 1 like this embodiment, since the volume of the part lower than a groundwater level is large, a big buoyancy acts. On the other hand, the underground structure 1 of the present embodiment includes a protruding portion 30 that protrudes outward, and when the buoyancy acts on the underground structure 1 of the protruding portion 30, the upper portion is supported from the ground. Because it receives pressure, it can resist buoyancy.

  Hereinafter, the construction method of the underground structure 1 of the present embodiment will be described with reference to FIGS. 2 to 9, (A) is a plan view, and (B) is a cross-sectional view taken along line AA ′ in (A). Moreover, FIGS. 10-16 is an expanded sectional view of the junction part of the underground structure main body 10 and the protrusion part 30. FIG.

  First, as shown in FIG. 2, a standing hole 40 is constructed so that the lower end reaches a position deeper than the protruding portion 30 at each position corresponding to the corner of the protruding portion 30 of the ground 2.

  Next, a shield machine (not shown) is placed in each vertical hole 40, and as shown in FIG. The segments 51 are sequentially attached to the peripheral surface. Thereby, as shown in the figure, the shield hole 50 is constructed so as to connect the standing holes 40.

  Next, as shown in FIGS. 4 and 10, the underground continuous wall 20 whose lower end reaches a position deeper than the shield hole 50 along the inside of the shield hole 50 constructed in a rectangular shape in plan view. To construct.

Next, as shown in FIGS. 5 and 11, the portion of the ground 2 surrounded by the underground continuous wall 20 is excavated until the lower end reaches a depth position corresponding to the lower portion of the shield hole 50.
Next, as shown in FIGS. 6 and 12, cement paste or the like is injected into the ground 2 on the underground continuous wall 20 side around the shield hole 50 to form an improved ground 70 having water-stopping and excavation stability. . For example, the cement paste may be injected through the injection wall through the underground continuous wall 20.

  Next, as shown in FIGS. 7 and 13, a portion having a height corresponding to the shield hole 50 of the underground continuous wall 20 is excavated from the inside 60 side of the underground continuous wall 20. By removing the segment 51 on the underground continuous wall 20 side and further excavating the ground between the underground continuous wall 20 and the shield hole 50, the inside of the shield hole 50 and the inside 60 of the underground continuous wall 20 To communicate. At this time, by using the ground 2 on the underground continuous wall 20 side of the shield hole 50 as the improved ground 70, even if the segment 51 of the shield hole 50 and a part of the underground continuous wall 20 are removed, the excavated part Therefore, it is possible to prevent the ground 2 from collapsing or the groundwater from flowing into the shield hole 50 or the underground continuous wall 20.

  Next, as shown in FIG. 14, the end of the reinforcing bar 13 constituting the foundation part 11 of the underground structure main body 10 reaches the inside of the shield hole 50 from the inside 60 side of the underground continuous wall 20. Arrange as you do. Then, as shown in FIG. 15, concrete 31 constituting the projecting portion 30 is placed in the shield hole 50, and the concrete 14 constituting the foundation portion 11 of the underground structure main body 10 is integrally formed with the concrete 31. To cast. When the placed concretes 14 and 31 are hardened, as shown in FIG. 8, the concrete 14 and 31 is horizontal so as to protrude outward from the underground continuous wall 20 integrally with the base portion 11 of the underground structure main body 10. Protrusions 30 extending in the direction of the belt are constructed.

  Next, as shown in FIGS. 9 and 16, the side wall 12 of the underground structure main body 10 is constructed inside the underground continuous wall 20 so as to be integrated with the underground continuous wall 20. And like the case of constructing a normal underground structure, the remaining part of the underground structure main body 10 is constructed integrally with the foundation part 11 and the side wall part 12 in the underground continuous wall 20. Thus, the construction work of the underground structure 1 of the present embodiment is completed. Then, after the construction of the underground structure 1 is completed, the vertical hole 40 is refilled.

  As described above, according to the present embodiment, the projecting portion 30 is constructed integrally with the underground structure body 10 using the internal space of the shield hole 50, so that the outer periphery of the underground structure body 10 is formed. The protrusion 30 having a large vertical projection area can be formed in a band shape. Thereby, since this protrusion part 30 receives support pressure from the surrounding ground, it can resist also the big buoyancy which acts on the underground structure 1 of a deep depth.

  In the present embodiment, the underground continuous wall 20 and a part of the shield hole 50 are removed so that the shield hole 50 communicates with the inside of the underground continuous wall 20, and the projecting portion 30 and the ground are removed through this connected portion. Although the base part 11 of the middle structure main body 10 is integrally constructed, it is not always necessary to provide an opening in the underground continuous wall.

  FIGS. 17-19 is a figure for demonstrating the method to construct | assemble the protrusion part 30 with the base part of the underground structure main body 10 without providing an opening in an underground continuous wall, Comprising: 4 is an enlarged cross-sectional view of a joint portion between the object body 10 and the protrusion 30. FIG. In such a case, as shown in FIG. 17, when constructing the underground continuous wall 120, the surface as shown in FIG. 20 is formed on the front and back surfaces at a height corresponding to the protruding portion 30 of the underground continuous wall 120. A corrugated steel panel 121 in which a hole 121A is formed is embedded. Further, as shown in FIG. 17, between these steel panels 121, the connecting rebar 123 with the joint hardware 122 connected at both ends corresponds to the joint 121 at both ends, respectively, corresponding to the hole 121 </ b> A of the steel panel 121. It is buried so that it may be placed at the position.

  Next, as shown in FIG. 18, cement ground or the like is injected into the ground 2 on the side of the underground continuous wall 20 around the shield hole 50, thereby forming an improved ground 70 having water-stopping and excavation stability. Then, the ground is excavated from the shield hole 50 to expose the steel panel 121 of the underground continuous wall 20 on the shield hole 50 side. Moreover, when excavating the ground inside the underground continuous wall 20, the steel panel 121 inside the underground continuous wall 20 is exposed. And the reinforcing bar 113 which comprises the protrusion part 30 is inserted in the joint hardware 122 through the hole 121A of the steel panel 121 from the shield hole 50 side, and it is jointed to the connection rebar 123 by the joint hardware 122, and the underground continuous wall 20 The reinforcing bar 113 constituting the base portion 111 is inserted from the inside of the steel panel 121 through the hole 121A of the steel panel 121, and is connected to the connecting reinforcing bar 123 by the joint hardware 122.

  Next, as shown in FIG. 19, the concrete 31 is placed inside the shield hole 50, and the concrete 114 constituting the foundation portion 111 of the underground structure main body 10 in the interior 60 of the underground continuous wall 20. To cast. When the placed concrete 31 and 114 is hardened, the reinforcing bar 113 constituting the foundation part 111 of the underground structure main body 10 and the reinforcing bar 113 constituting the protruding part 30 are connected via the connecting reinforcing bar 123. In addition, since the unevenness is formed on the surface of the steel panel 121, stress is transmitted between the concrete 114 constituting the foundation portion 111 and the concrete 31 constituting the protruding portion 30 via the underground continuous wall 20. Thus, it is structurally connected to the base portion 111 of the underground structure main body 10. Thus, according to said structure, without providing an opening in the underground continuous wall 120, it protrudes integrally with the base part 111 of the underground structure main body 10 through the steel panel 121 and the connection reinforcing bar 123. 30 can be constructed.

  In each of the above-described embodiments, the protruding portion 30 is provided at a height corresponding to the base portion 11 of the underground structure main body 10. However, the present invention is not limited thereto, and may be provided at another height. And it is good also as a structure which provides a some protrusion part.

  In each of the above-described embodiments, the shield hole having a circular vertical cross section is cut. However, the shape is not limited to this, and the shape of the shield hole is not limited.

In each of the above embodiments, a shield hole is formed by a shield machine, and the protruding portion is constructed using the shield hole. However, the invention is not limited to this, and non-cutting such as a propulsion method and a pipe roof method are used. A tunnel may be formed by a construction method or the like, and the protruding portion may be constructed using this tunnel hole.
In the present embodiment, the underground continuous wall is constructed so as to surround the outer periphery of the underground structure main body. However, the present invention is not limited to this, and is configured to be integrated with part of the outer periphery of the underground structure. Also good. Although the projecting portion is provided over the entire outer periphery of the underground continuous wall, it is not limited thereto, and may be provided only on a part of the outer periphery of the underground continuous wall.

The structure of the underground structure of this embodiment is shown, (A) is a top view, (B) is AA 'sectional drawing in (A). It is the figure (the 1) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is a figure (the 2) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is a figure (the 3) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is a figure (the 4) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is a figure (the 5) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is the figure (the 6) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is a figure (the 7) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is a figure (the 8) for demonstrating the construction method of the underground structure of this embodiment, (A) is a top view, (B) is AA 'sectional drawing in (A). It is a figure (the 9) for demonstrating the construction method of the underground structure of this embodiment, and is an expanded sectional view of the junction part of a underground structure main body and a protrusion part. It is a figure (the 10) for demonstrating the construction method of the underground structure of this embodiment, and is an expanded sectional view of the junction part of an underground structure main body and a protrusion part. It is a figure (the 11) for demonstrating the construction method of the underground structure of this embodiment, and is an expanded sectional view of the junction part of an underground structure main body and a protrusion part. It is FIG. (12) for demonstrating the construction method of the underground structure of this embodiment, and is an expanded sectional view of the junction part of a underground structure main body and a protrusion part. It is FIG. (13) for demonstrating the construction method of the underground structure of this embodiment, and is an expanded sectional view of the junction part of an underground structure main body and a protrusion part. It is FIG. (14) for demonstrating the construction method of the underground structure of this embodiment, and is an expanded sectional view of the junction part of a underground structure main body and a protrusion part. It is FIG. (15) for demonstrating the construction method of the underground structure of this embodiment, and is an expanded sectional view of the junction part of an underground structure main body and a protrusion part. It is the figure (the 1) for demonstrating the method to construct | assemble a protrusion part integrally with the base part of an underground structure main body, without providing an opening in an underground continuous wall, It is an expanded sectional view of a joined part. It is the figure (the 2) for demonstrating the method to construct a protrusion part integrally with the base part of an underground structure main body, without providing an opening in an underground continuous wall, and an underground structure main body, a protrusion part, and It is an expanded sectional view of a joined part. It is the figure (the 3) for demonstrating the method to construct a protrusion part integrally with the foundation part of an underground structure main body, without providing an opening in an underground continuous wall, and an underground structure main body, a protrusion part, and It is an expanded sectional view of a joined part. It is a perspective view which shows a steel panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground structure 2 Ground 10 Underground structure main body 11, 111 Base part 12 Side wall part 13, 113 Reinforcement 14, 114 Concrete 20, 120 Underground continuous wall 30 Protrusion part 31 Concrete 40 Standing hole 50 Shield hole 51 Segment 60 Inside of underground continuous wall 70 Improved ground 121 Steel panel 121A Hole 122 Joint fitting 123 Connection reinforcing bar

Claims (4)

An underground structure main body, an underground wall constructed integrally with the underground structure main body, and formed to extend in a strip shape in the horizontal direction on the surface of the underground wall, and outward from the surface of the underground wall A method of constructing an underground structure comprising a projecting portion projecting toward
An underground wall construction step of constructing the underground wall;
A tunnel drilling step for drilling a tunnel along the outer periphery of the underground wall at a depth corresponding to the projecting portion of the ground;
By constructing the underground structure main body integrally with the underground wall inside the underground wall, and by constructing a concrete structure in the tunnel so as to be integrated with the underground structure main body A projecting part construction step for constructing the projecting part, and a method for constructing an underground structure, comprising:
A construction method for an underground structure according to claim 1 ,
In the protrusion construction step,
The inside of the tunnel and the inside of the underground wall are communicated,
A construction method of an underground structure, wherein the underground structure main body and the concrete structure are constructed integrally through the communicating portion.
A construction method for an underground structure according to claim 1 ,
In the underground wall construction step,
A corrugated panel having openings near the inner and outer surfaces near the height of the tunnel corresponding to the tunnel of the underground wall is embedded, and connecting joints having joint hardware connected to both ends are connected to the front and back surfaces, respectively. Embed it so as to be placed in contact with the opening of the corrugated panel,
In the protrusion construction step,
The portion of the tunnel on the underground wall side is removed to expose the outer corrugated panel embedded in the underground wall, and a reinforcing bar is attached to the joint hardware from the inside of the tunnel through the opening of the outer corrugated panel. Joint, and place concrete in the tunnel so that the rebar is embedded, build the protrusion,
Further, exposing the inner corrugated panel, connecting a reinforcing bar to the joint hardware from the inside of the underground wall through the opening of the inner corrugated panel, placing concrete so that the reinforcing bar is embedded, and A construction method of an underground structure characterized by constructing an underground structure main body.
A construction method for an underground structure according to any one of claims 1 to 3 ,
Before the protrusion construction step,
A method for constructing an underground structure, comprising a ground improvement step for improving the ground on at least the ground wall side surrounding the tunnel.
JP2008223894A 2008-09-01 2008-09-01 Construction method of underground structure Expired - Fee Related JP5169638B2 (en)

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JP5560794B2 (en) 2010-03-16 2014-07-30 ソニー株式会社 Control device, control method and program
CN111236310B (en) * 2020-03-03 2021-03-30 福建工程学院 Construction method of connecting channel of existing underground structure in weak water-rich stratum

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JP2594863B2 (en) * 1992-01-14 1997-03-26 エス・ティ・ケイ株式会社 Underground tunnel widening method and branching / merging section construction method
JP3045055B2 (en) * 1995-10-30 2000-05-22 株式会社大林組 Underground diaphragm wall
JP4299455B2 (en) * 2000-12-21 2009-07-22 新日本製鐵株式会社 Junction structure and joining method for large-section tunnel segments
JP2003020098A (en) * 2001-07-04 2003-01-21 Shimizu Corp Underground tank lifting preventive structure

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