JP2008075385A - Method and structure for anchoring structural member for supporting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a structure for anchoring a structural member for supporting capable of supporting a portion to be cut and capable of compactly and easily constructing an anchoring portion. <P>SOLUTION: A sheath pipe 10 is fitted to a segment 12 in each of shield tunnels 2, 4 arranged parallel to each other. Steel pipes 6 for installation are so installed between the second shield tunnel 4 and the first shield tunnel 2 as to be inserted into the sheath pipes 10. A structural member 18 for supporting is inserted into the steel pipes 6 for installation. The end of the structural member 18 for supporting projects from the sheath steel pipe 10. A cover plate 22 is connected to the end. The cover plate 22 is fixed to a predetermined position in the sheath steel pipes 10. A solidifying agent 26 is charged between the sheath pipe 10 and the structural member 18 for supporting. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In order to communicate two shield tunnels arranged side by side, the present invention provides a structural member for support that is installed in advance in the ground above and below the planned site when the ground between the shield tunnels is excavated. The present invention relates to a fixing method and a fixing structure.

  When constructing subway station premises and underpass branching / merging sections, etc., shield tunnels are installed side by side, ground between these shield tunnels is excavated and communicated, and the cross-section becomes a shield tunnel of compound form such as glasses A method of forming them integrally is used. Here, as a fixing method of the connecting material installed between the shield tunnels when excavating the ground between the shield tunnels, the connecting material is passed from one shield tunnel to the other shield tunnel, and this end is fixed to the segment. Is used.

  For example, as shown in FIG. 11, a sheath steel pipe 102 having a diver 101a on the inner peripheral surface is attached to the segment 103, a gibber 101b is attached to the outer peripheral surface, and a rib 105 for preventing the retaining is attached to the end. The material 104 is passed from one shielded tunnel to the other shielded tunnel using a propulsion device or the like so as to be inserted through the sheathed steel pipe 102, and the sheathed steel pipe 102 is filled with a solidifying agent 106 such as mortar or concrete. A method of fixing 105 and segment 103 is used.

Further, in Patent Document 1, as shown in FIG. 12, an intubation tube 110 having a gibber 101c on the outer peripheral surface is attached to the end of the segment 103, and a connecting member 107 disposed at the upper part of the communication part between both shield tunnels is provided. At the end, a sheath tube 108 having a gibber 101d on the inner peripheral surface and capable of loosely inserting the inner intubation 110 is provided, and the inner intubation 110 and the sheath tube 108 are inserted by inserting the inner intubation 110 into the sheath tube 108. A method is disclosed in which the grout material 109 is filled and fixed in between.
JP 2004-169474 A

  However, in the method of fixing the connecting material 104 and the segment 103 by filling the sheath steel tube 102 with the solidifying agent 106, the solidifying agent 106 may be damaged when a large axial force acts on the connecting material 104. is there. Therefore, in order to prevent the solidifying agent 106 from being damaged, a method of increasing the area of the end surface 109 of the connecting material 105 in contact with the solidifying agent 106 is used as shown in FIG. There is a problem in that the diameter of the fixing portion increases, and the mechanism of the fixing unit increases in size.

  Further, since an error in construction occurs when the connecting material 104 is passed from one shield tunnel to the other shield tunnel, it is very difficult to insert the connecting material 104 into the sheath steel tube 102, which takes time and effort. There was a problem.

  Furthermore, in the method described in Patent Document 1, a communication portion is constructed by cutting between the shield tunnels, and the connecting material 107 and the segment 103 are spanned between the shield tunnels using the space of the communication portion. And is not applicable when supporting the planned excavation site before excavating the ground between the shield tunnels.

  Therefore, the present invention has been made in view of the above-described conventional problems, and can support a planned excavation site, and a fixing method for a supporting structural member that can be easily constructed with a compact fixing site. An object is to provide a fixing structure.

  In order to achieve the above object, according to the fixing method of a supporting structural member of the present invention, when excavating a ground between these shield tunnels in order to communicate two shield tunnels arranged side by side in advance, In the fixing method of the supporting structural member installed in the lower ground, a sheath steel pipe is attached to a segment in one shield tunnel, and a steel pipe for installation from the other shield tunnel to the one shield tunnel is placed in the sheath steel pipe. The support structural member is inserted into the construction steel pipe from the other shield tunnel to the one shield tunnel until the tip projects from the sheath steel pipe. A plate is fixed to the tip, and the supporting structural member is moved to the other shield until the plate reaches a predetermined position in the sheath steel pipe. Is retracted into the tunnel side, said fixing the plate to the sheath steel pipe at a predetermined position, characterized by fixing said said 支保 structural member segments (the first invention).

  According to the fixing method of the supporting structural member according to the present invention, the installation steel pipe is passed from the other shield tunnel to the one shield tunnel, the supporting structural member is inserted into the installation steel pipe, and between the shield tunnels. Therefore, the supporting structural member can be reliably guided into the sheath steel pipe. Therefore, the supporting structural member can be easily inserted in a short time.

  Further, the tip of the supporting structural member is projected from the sheath steel pipe into the shield tunnel, a plate is attached to this tip, and the supporting structural member is moved to the other shield tunnel side until the plate reaches a predetermined position in the sheath steel pipe. In order to retract and fix the plate to the sheath steel pipe, the supporting structural member can be accurately installed at a predetermined position in the sheath steel pipe, and can resist the axial force acting on the supporting structural member. . Furthermore, since the fixing portion where the plate is fixed to the sheath steel pipe only has to resist axial force, this fixing portion can be made small.

A second invention is characterized in that, in the first invention, the supporting structural member and the segment are fixed by filling a solidifying agent between the sheath steel pipe and the supporting structural member.
According to the fixing method of the supporting structural member according to the present invention, the supporting structural member and the segment are firmly fixed by filling the solidifying agent between the sheath steel pipe and the supporting structural member and solidifying it. It is possible to resist the bending moment acting on the structural member. Furthermore, since the fixing part filled with the solidifying agent only has to resist the bending moment, this fixing part can be made small.

A third invention is characterized in that, in the first or second invention, the supporting structural member is an H-type, I-type or the like steel.
According to the fixing method of the supporting structural member according to the present invention, the supporting structural member is a general steel such as H-shaped steel or I-shaped steel and is easily available.

  In the fixing structure of the supporting structural member according to the fourth aspect of the present invention, in order to connect two shield tunnels arranged side by side, when excavating the ground between the shield tunnels, the ground structure above and below the planned excavation site is previously provided. A fixing structure of a supporting structural member installed in a sheath steel pipe is attached to a segment in one shield tunnel, and the construction steel pipe reaches the one shield tunnel from the other shield tunnel so as to reach the sheath steel pipe The supporting structural member is inserted into the construction steel pipe from the other shield tunnel to the one shield tunnel until the tip projects from the sheath steel pipe, and a plate is attached to the tip of the supporting structural member. And the supporting structural member is retracted toward the other shield tunnel until the plate reaches a predetermined position in the sheath steel pipe. The supporting structural member is fixed to the segment by a method of fixing the plate to the sheath steel pipe at the predetermined position and filling a solidifying agent between the sheath steel pipe and the supporting structural member. It is characterized by.

  By using the supporting structure fixing method and fixing structure of the present invention, the supporting structural member can be firmly fixed to the segment in a short time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing parallel shield tunnels to which the present invention is applied. As shown in FIG. 1, a first shield tunnel 2 having a large circular cross section and a second shield tunnel 4 having a small circular cross section adjacent to the side of the first shield tunnel 2 are juxtaposed in parallel. In this way, the ground between the shield tunnels 2 and 4 having two circular cross-sections arranged adjacent to each other is cut and communicated to form a tunnel having a glasses-like cross section. In addition, the cross-sectional shape of the shield tunnels 2 and 4 is not limited to the illustrated perfect circle shape, and may be elliptical.

  Below, the fixing method of the structural member for support which concerns on this invention is demonstrated according to a construction procedure. In the present embodiment, a case where the supporting structural member is extended from the second shield tunnel 4 side to the first shield tunnel 2 side will be described.

First, the sheath steel pipe 10 is attached to the segment 12 that forms the covering body of the first shield tunnel 2 that is the arrival side of the supporting structural member.
2 and 3 show a state in which the sheath steel pipe 10 is attached to the segment 12 of the first shield tunnel 2, and are a side sectional view and a plan view, respectively.
As shown in FIGS. 2 and 3, the sheath steel pipe 10 is attached to a predetermined position of the segment 12. In the present embodiment, as the segment 12, for example, a steel segment having a width of 1.2 m, in which a reinforcing rib 14 extending in the circumferential direction is provided at the center in the width direction, is used. The sheath steel pipe 10 is attached to both sides of the reinforcing rib 14, and the inner diameter of the sheath steel pipe 10 is, for example, 740 mm long and 455 mm wide.

Next, the erection steel pipe 6 is inserted into the ground 8 above and below the part to be cut between the shield tunnels 2 and 4.
FIG. 4 is a diagram showing a state in which the erection steel pipe 6 is installed above and below the planned excavation site of the natural ground 8. 5 and 6 show a state in which a portion where the erection steel pipe 6 of FIG. 4 has reached the sheath steel pipe 10 is enlarged, and are a side sectional view and a plan view, respectively.
As shown in FIGS. 4 to 6, the steel pipe 6 for erection is directed from the second shield tunnel 4 toward the first shield tunnel 2 in the ground 8 above and below the part to be cut between the shield tunnels 2 and 4. Using a curved boring device, the arcuate steel bent pipe, which is the erection steel pipe 6, is hung so that the tip of the steel pipe reaches the sheath steel pipe 10. Here, the steel pipe 6 for construction is sequentially pushed into the ground 8 by the propulsion method, and it is passed over. In the present embodiment, for example, a rectangular steel pipe having a length of 606 mm, a width of 306 mm, and a thickness of 15 mm is used as the erection steel pipe 6. Even when some construction errors occur when the construction steel pipe 6 is passed over, the construction steel pipe 6 is easily sheathed because the outer diameter of the construction steel pipe 6 is sufficiently smaller than the inner diameter of the sheath steel pipe 10. It reaches into the steel pipe 10. In addition, although the case where a rectangular steel pipe was used as the construction steel pipe 6 was described, it is not limited to this shape, and a round pipe or the like may be used.

Next, the ground around each erection steel pipe 6 is improved.
FIG. 7 is a diagram showing a state in which the ground 8 above and below the site to be excavated has been ground improved. As shown in FIG. 7, the chemical | medical solution 16 is inject | poured around the steel pipe 6 for each installation, and a ground is improved.
Next, the supporting structural member 18 is inserted into the natural ground 8 above and below the part to be cut between the shield tunnels 2 and 4.

8 and 9 show a state in which the support structural member 18 is installed above and below the planned excavation site of the natural ground 8, and are a side sectional view and a plan view, respectively.
First, an arcuate supporting structural member 18 having the same radius of curvature as the erection steel pipe 6 is inserted through the erection steel pipe 6 from the second shield tunnel 4 side to the first shield tunnel 2 side by a propulsion device, The tip of the supporting structural member 18 is protruded from the sheath steel pipe 10. In the present embodiment, for example, H-shaped steel having a height of 400 mm, a width of 200 mm, and a plate thickness of 40 mm is used as the supporting structural member 18. A rib 20 for attaching the lid plate 22 is fixed to the end of the H-shaped steel by welding. In addition, by inserting the supporting structural member 18 into the erection steel pipe 6, the supporting structural member 18 reliably reaches the sheath steel pipe 10.

  Next, the lid plate 22 is connected to the rib 20 at the tip end of the supporting structural member 18 protruding from the sheath steel pipe 10 with the bolt 24. Here, it connects so that the rib 20 may be located in the approximate center of the cover plate 22. FIG. In this embodiment, as the lid plate 22, the sheath steel pipe has substantially the same shape as the transverse cross section of the sheath steel pipe 10 so that it can be inserted into the sheath steel pipe 10 and can be attached to the inner peripheral surface of the sheath steel pipe 10 by welding. A plate-like plate slightly smaller than the inner diameter of 10, for example, a length of 735 mm, a width of 450 mm, and a plate thickness of 40 mm was used. The method of connecting the lid plate 22 to the rib 20 is not limited to the bolt 24, and may be connected by welding or the like.

  Then, by retracting the supporting structural member 18 to which the lid plate 22 is connected to the second shield tunnel 4 side, the lid plate 22 is removed from the end surface 10a of the sheath steel pipe 10 by a predetermined amount as shown in FIGS. The lid plate 22 is accommodated in the sheath steel pipe 10 by welding at a predetermined position in the length. The method of fixing the lid plate 22 to the sheath steel pipe 10 is not limited to welding, and may be fixed with a bolt or the like. Thereby, the structural member 18 for support is fixed with respect to the sheath steel pipe 10, and the movement to an axial direction is blocked | prevented. Moreover, the supporting structural member 18 is arranged at the center of the sheath steel pipe 10 by inserting the lid plate 22 having substantially the same shape as the sheath steel pipe 10 and slightly smaller than the inner diameter of the sheath steel pipe 10 into the sheath steel pipe 10. Become. As a method of positioning the lid plate 22 in the sheath steel pipe 10, for example, a stopper (protrusion or the like) is provided in advance at a predetermined position in the sheath steel pipe 10 and moved until the lid plate 22 contacts the stopper. It is good as well.

Next, the sheathing steel pipe 10 is filled with a solidifying agent 26 such as mortar or concrete, and the supporting structural member 18 is fixed to the segment 12.
FIG. 10 is a view showing a state in which the supporting structural member 18 is fixed to the segment 12. As shown in FIG. 10, the solidifying agent 26 is filled between the supporting structural member 18 and the sheath steel pipe 10 from the filling hole 28 provided in the sheath steel pipe 10 to be solidified, and the supporting structural member 18 is segmented 12. To settle. By solidifying between the supporting structural member 18 and the sheath steel pipe 10 with the solidifying agent 26, the supporting structural member 18 is firmly fixed to the segment 12, and the twisting and bending of the supporting structural member 18 are prevented. It will be.
When the solidifying agent 26 is solidified, an internal support for preventing the shield tunnels 2 and 4 from being deformed when the part to be cut is opened is installed in both the shield tunnels 2 and 4 and the cutting is scheduled. The part is excavated and the shield tunnels 2 and 4 are connected.

  As described above, according to the fixing method of the supporting structural member 18 of the present embodiment, the construction steel pipe 6 is spanned from the second shield tunnel 4 to the first shield tunnel 2, and the support steel pipe 6 is supported in the construction steel pipe 6. Since the structural member 18 is inserted and spanned between the shield tunnels 2 and 4, the supporting structural member 18 can be reliably guided into the predetermined sheath steel pipe 10. Therefore, the supporting structural member 18 can be easily inserted in a short time.

  Further, the distal end of the supporting structural member 18 is protruded from the sheath steel pipe 10 into the first shield tunnel 2, and a lid plate 22 is attached to the distal end, and is supported until the lid plate 22 reaches a predetermined position in the sheath steel pipe 10. In order to retract the structural member 18 for the second shield tunnel 4 and fix the lid plate 22 to the sheath steel pipe 10, the supporting structural member 18 can be accurately installed at a predetermined position in the sheath steel pipe 10. In addition, it becomes possible to resist the axial force acting on the supporting structural member 18.

  Further, the solidifying agent 26 is filled between the sheath steel pipe 10 and the supporting structural member 18 to be solidified, and acts on the supporting structural member 18 in order to firmly fix the supporting structural member 18 and the segment 12. It becomes possible to resist the bending moment.

  Since the resistance to the axial force and the bending moment is assigned to different parts in this way, the size required for each part can be small, and the fixing part can be made small.

  Further, the supporting structural member 18 is a typical steel such as H-shaped steel or I-shaped steel, and is easily available.

  In the present embodiment, the method of spanning the construction steel pipe 6 and the supporting structural member 18 from the second shield tunnel 4 side to the first shield tunnel 2 side has been described, but the present invention is not limited to this. You may span from the 1st shield tunnel 2 side to the 2nd shield tunnel 4 side.

It is a figure which shows the parallel shield tunnel to which this invention is applied. It is side sectional drawing which shows the state which attached the sheath steel pipe to the segment of the 1st shield tunnel. It is a top view which shows the state which attached the sheath steel pipe to the segment of the 1st shield tunnel. It is a figure which shows the state which installed the steel pipe for construction in the upper direction and the downward direction of the excavation site | part of a natural ground. It is a sectional side view which shows the state which the steel pipe for construction of FIG. 4 expanded the part which reached | attained the sheath steel pipe. It is a top view which shows the state which expanded the part which the steel pipe for construction of FIG. 4 reached | attained the sheath steel pipe. It is a figure which shows the state which improved the ground of the natural ground above and the lower part of an excavation plan site | part. It is a sectional side view which shows the state which installed the structural member for support in the upper direction and the downward direction of the excavation plan site | part of a natural ground. It is a top view which shows the state which installed the structural member for support above and below the excavation plan site | part of a natural ground. It is a figure which shows the state which fixed the structural member for support to the segment. It is a figure which shows the state which fixed the conventional connection material. It is a figure which shows the state which fixed the conventional connection material. It is a figure which shows the state which fixed the conventional connection material.

Explanation of symbols

2 First shield tunnel 4 Second shield tunnel 6 Steel pipe for installation 8 Ground 10 Sheath steel pipe 10a End face 12 of the sheath steel pipe Segment 14 Reinforcement rib 16 Chemical solution 18 Supporting structural member 20 Rib 22 Lid plate 24 Bolt 26 Solidifying agent 28 For filling hole

Claims (4)

In the fixing method of the supporting structural member installed in the ground above and below the planned excavation site when excavating the natural ground between the shield tunnels in order to communicate the two shield tunnels arranged side by side,
Attach a sheath steel pipe to a segment in one shield tunnel,
Span the steel pipe for erection from the other shield tunnel to the one shield tunnel so as to reach the inside of the sheath steel pipe,
From the other shield tunnel to the one shield tunnel, the supporting structural member is inserted into the erection steel pipe until the tip projects from the sheath steel pipe,
A plate is fixed to the tip of the supporting structural member,
The supporting structural member is retracted to the other shield tunnel side until the plate reaches a predetermined position in the sheath steel pipe, the plate is fixed to the sheath steel pipe at the predetermined position, and the supporting structural member And fixing the segment. The fixing method of the supporting structural member.   2. The fixing method for a supporting structural member according to claim 1, wherein the supporting structural member and the segment are fixed by filling a solidifying agent between the sheath steel pipe and the supporting structural member. .   The method for fixing a supporting structural member according to claim 1, wherein the supporting structural member is a steel of H type or I type. In order to communicate two shield tunnels arranged side by side, when excavating the ground between these shield tunnels, it is a fixing structure of a supporting structural member that is installed in advance above and below the planned excavation site,
A sheath steel pipe is attached to a segment in one shield tunnel, a construction steel pipe is spanned from the other shield tunnel to the one shield tunnel so as to reach the inside of the sheath steel pipe, and the one shield from the other shield tunnel. A structural member for support is inserted into the tunnel until the tip protrudes from the sheath steel pipe, and a plate is fixed to the distal end of the structural member for support. The supporting structural member is retracted to the other shield tunnel side until reaching a position, the plate is fixed to the sheath steel pipe at the predetermined position, and a solidifying agent is provided between the sheath steel pipe and the supporting structural member. A fixing structure for a supporting structural member, wherein the supporting structural member is fixed to the segment by a method of filling the support.

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