JP6483575B2 - Segment frame, segment manufacturing method, and segment - Google Patents

Description

  The present invention relates to a frame of a segment that connects a plurality of pieces to construct a wall in a drilling hole, a method for manufacturing a segment using the frame, and a segment.

  In a shield method widely used for tunnel construction such as tunnels and underpasses, a segment for constructing a wall in a drilled hole is known. The segment is provided with a frame having a skin plate that forms an outer wall surface and a side wall plate provided on the skin plate, and the concrete is integrated with the frame by placing concrete inside the frame. There is a filling segment.

  In the production of such a concrete filling segment, the concrete is cast from the inner surface side with the open inner surface side facing upward, and the inner surface of the concrete is finished by a worker with a heel. There is a need. For this reason, the burden of finishing the inner surface of the segment is large, and the manufacturing cost is high.

  On the other hand, in the state where the injection hole for filling concrete is formed in the skin plate which is the outer wall surface, and the skin plate is placed on the mold base with the skin plate facing upward, the concrete is put into the frame from the injection hole of the skin plate. There has been proposed a manufacturing method for placing the material on the surface (for example, see Patent Document 1).

JP 2010-201915 A

In the segment manufactured by the method described in Patent Document 1, it is not necessary for the worker to finish the inner surface with a scissors, and the work burden and manufacturing cost can be reduced.
However, after constructing the borehole wall in the segment, groundwater that flows out from the ground of the borehole may enter the interior of the segment from the fillhole that was used to inject the concrete during the manufacture of the segment. The infiltrated water may pass between the concrete and the formwork and come into contact with the concrete in a wide area inside the segment, in which case the concrete may deteriorate. Furthermore, water may leak from the segment into the tunnel, in which case water leakage countermeasure processing work is required. From the above, a great deal of labor is required for segment maintenance.

  Therefore, the present invention has been made in view of the above problems. Even when water has entered from the outer wall side of the segment by improving the structure of the frame of the segment, the present invention has been made in the tunnel from the inner wall side of the segment. An object of the present invention is to provide a frame of a segment that can suppress water leakage to the water, a method of manufacturing a segment using the frame, and a segment.

  In order to achieve the above object, the present invention provides a frame of a segment for constructing a wall in an excavation hole, which forms an outer wall of the segment and has at least one through hole, and the skin plate A side wall plate standing on the edge of the segment to form the side wall of the segment, and provided on the inner surface side of the skin plate so as to surround the through hole, one end of which is closely connected to the skin plate, and at least the wall portion A tube member having one opening, and a water-swellable seal member densely provided on an outer wall surface of the tube member so as to sandwich the opening in the axial direction of the tube member. To do.

  Moreover, it is preferable to provide the closing member which closes the other end side of the said tube member.

  Moreover, it is preferable that the said closure member is provided in the said tube member so that attachment or detachment is possible.

  Moreover, it is preferable to provide the water stop member provided between the said closure member and the said tube member.

  Moreover, it is preferable that the said pipe member is equipped with the attachment / detachment part which makes another pipe member attachable / detachable at the said one end.

  The one end of the pipe member is preferably welded to the skin plate.

  Furthermore, in order to achieve the above object, the present invention provides a method of manufacturing a segment using the segment frame according to the present invention, wherein the frame is molded with the skin plate facing upward. A step of installing on the frame base; a step of attaching another pipe member to the one end of the pipe member so as to protrude outside the skin plate; and the skin plate and the pipe member through the another pipe member and the pipe member A step of supplying a filling material to a space surrounded by the frame body and the formwork base to form a filling material, and a step of removing the another tube member from the tube member after the formation of the filling material It is characterized by having.

  Furthermore, in order to achieve the above-mentioned object, the present invention includes a frame of a segment according to the present invention, a filling body provided in a space surrounded by the skin plate and the side wall plate of the frame, It is characterized by providing.

  According to the present invention, water leakage from the inner wall side of the segment into the tunnel can be suppressed even when water enters from the outer wall side of the segment.

It is a longitudinal cross-sectional view of a segment. It is a perspective view of the frame used in the segment shown in FIG. It is sectional drawing which expands and shows the tubular member of a frame partially. It is a figure explaining the manufacturing method of a segment.

  Preferred embodiments of the present invention will be described with reference to the drawings. The following embodiment is merely an example, and various embodiments can be employed within the scope of the present invention.

<Composition of segments>
FIG. 1 is a longitudinal sectional view showing a segment 1 according to the present invention in a cross section in the longitudinal direction. FIG. 2 is a perspective view of the frame body 10 used in the segment 1 shown in FIG. 1, and depicts the pipe member 20 so as to be seen through. FIG. 3 is an enlarged cross-sectional view showing a section of the pipe member 20 in the segment 1. FIG. 4 is a diagram for explaining a method of manufacturing the segment 1 and depicts a state in which the frame body 10 is installed on the mold base 40.

As shown in FIG. 1, the segment 1 includes a frame body 10 and a concrete filling body 30 integrated with the frame body 10.
The segment 1 is formed in an arc shape in a side view so as to bend in the longitudinal direction, and an annular segment ring can be constructed by connecting a plurality of segments in the circumferential direction. This segment ring is arranged continuously along the axial direction (extension) of the tunnel.

(Frame)
The frame 10 forms the outer wall and the side wall of the segment 1, and is formed in a hollow arc frame shape in which the inner wall side of the segment 1 is opened and the outer wall and the peripheral wall side are closed.
The frame 10 is composed of a plurality of steel members. Specifically, as shown in FIG. 2, a skin plate 11 that forms the outer wall of the segment 1 and the skin plate 11 along its longitudinal direction. A pair of main girders 12 a and 12 b (side wall plates) that are erected, a pair of joints 13 a and 13 b (side wall plates) that are erected along the short direction of the skin plate 11, and the skin plate 11 are provided. The cylindrical tube member 20 is provided, and seal members 26 a and 26 b provided on the tube member 20.

[Skin plate]
The skin plate 11 forms the outer wall of the segment 1, that is, a rectangular steel plate that contacts the inner wall of the excavation hole when the segment 1 is installed in an excavated tunnel or the like, along the longitudinal direction. It is formed in a shape curved in an arc shape.
As shown in FIGS. 1 and 2, the skin plate 11 is formed with at least one through hole 11 a penetrating in the thickness direction of the skin plate 11. The pipe member 20 is joined to the periphery of the through hole 11a on the inner side of the frame body 10 (inner side of the skin plate 11) at one end thereof by welding, and the frame body is passed through the through hole 11a and the pipe member 20. Concrete can be supplied from the outside to the inside.
The position where the through hole 11 a is formed depends on the posture of the frame body 10 when supplying concrete into the frame body 10. Specifically, it is preferably formed at a position that is the highest position of the frame body 10 when it is placed on a mold base 40 described later. Further, the number of through holes 11a is not limited to one, and a plurality of through holes 11a may be formed at an appropriate interval.

[Main girder, joint]
As shown in FIG. 2, the main girders 12 a and 12 b form the side walls of the segment 1, that is, are joined to the respective edges extending in the longitudinal direction of the skin plate 11 by welding to form the skin plate 11. It is the steel plate erected with respect to the surface. Specifically, the main girders 12a and 12b face the tunnel axial direction (extension direction) when the segment 1 is installed, for example, to construct the inner wall of the tunnel, and the arc-shaped shape of the skin plate 11 Along the line, similarly, it has a shape curved in an arc shape.
The joints 13a and 13b form the side wall of the segment 1, that is, joined to each edge extending in the short direction (width direction) of the skin plate 11 by welding, and the surface of the skin plate 11 It is the steel plate currently installed with respect to. Specifically, the joints 13a and 13b face the circumferential direction of the tunnel when the segment 1 is installed to construct the inner wall of the tunnel.
Therefore, the main girders 12a and 12b and the joints 13a and 13b are alternately arranged along the edge of the skin plate 11, and the ends of the main girders 12a and 12b in the longitudinal direction of the joints 13a and 13b, respectively. It is joined to each end in the longitudinal direction.
In addition, as long as the required minimum strength as a segment is satisfied, a segment in which one of the main girders 12a and 12b and the joints 13a and 13b is omitted may be used.

[Pipe members]
The pipe member 20 is a cylindrical steel pipe attached to the inner surface side of the skin plate 11. As shown in FIG. 3, the pipe member 20 is closely attached to the inner surface of the skin plate 11 coaxially with the through hole 11a at one end thereof by welding over the entire circumference.
Here, “densely” means a state in which groundwater entering from the outside of the segment 1 does not flow from the welded portion W between the skin plate 11 and the pipe member 20.
Both ends of the pipe member 20 are opened, and one end thereof is a supply port 21 through which concrete is supplied. The other end of the pipe member 20 is closed and water-stopped by a plug 22 as a closing member.

On the inner peripheral surfaces at both ends of the tube member 20, there are formed detachable portions that can be freely attached to and detached from another tube member 50 and a plug 22 for concrete injection and air vent described later. Mountains 23a and 23b are formed. On the supply port 21 side (one end side) of the pipe member 20, another pipe member 50 is screwed and connected via a screw thread 51 formed on the outer peripheral surface of the pipe member 20 and a screw thread 23a of the pipe member 20. .
The plug 22 is connected to the closed side (the other end) of the tube member 20 via a screw thread 22a formed on the outer peripheral surface thereof and a screw thread 23b of the tube member 20.
A known sealing member 24 such as a rubber ring is provided between the plug 22 and the inner peripheral surface of the other end of the tube member 20, and passes between the thread 22a and the thread 23b. The passage of groundwater which is going to leak to the inner wall side of segment 1 is blocked.

  A plurality of openings 25 penetrating in the thickness direction are provided on the peripheral surface of the pipe member 20. These openings 25 are configured such that when the concrete is supplied, the concrete supplied to the pipe member 20 through the through holes 11a flows out from the opening 25 to the outside of the pipe member 20, that is, inside the frame body 10.

[Seal material]
Two seal members 26 a and 26 b are attached to the outer peripheral surface of the tube member 20 at intervals in the axial direction of the tube member 20. More specifically, the two seal members 26 a and 26 b are attached so as to tighten the tube member 20 radially inward so as to sandwich the opening 25 in the axial direction of the tube member 20.
The seal members 26a and 26b expand by absorbing water while exhibiting a water stop function between the region sandwiched between these seal members 26a and 26b and the other regions, thereby further improving the water stop effect. Has the function of strengthening.

(Filling)
The filling body 30 is formed by placing concrete as filling material inside the frame body 10 via the pipe member 20 and integrating with the frame body 10. Here, since the frame body 10 becomes a formwork at the time of placing concrete, the filling body 30 after being cast and solidified is formed in an arc shape along the curvature of the skin plate 11. As shown in FIGS. 1 and 3, after the filling material is placed, the tube member 20 is buried in the filling material 30.
In FIG. 3, for convenience of explanation, the filling body 30 is not drawn in the pipe member 20, but as the segment 1, concrete is also placed in the pipe member 20 to form the filling body 30. Yes.

<Segment manufacturing method>
Next, the manufacturing method of said segment 1 is demonstrated based on FIG.
In manufacturing the segment 1, the mold base 40 is used to form the filling 30 so that it fits in the frame 10. The mold base 40 has a concave portion 41 having a bottom section formed in an arc shape on the upper surface thereof. Here, the bottom of the recess 41 is formed such that its curvature is substantially equal to the curvature of the skin plate 11.

First, the frame 10 is installed in the recess 41 from the opening side (the side opposite to the skin plate 11). That is, the frame body 10 is installed on the mold base 40 so that the skin plate 11 of the frame body 10 faces upward. By installing the frame body 10 in the recess 41, the position of the frame body 10 is fixed with respect to the mold base 40. After installation, the frame 10 may be fixed to the mold base 40 with a predetermined fixing tool.
As a result, a space S for placing concrete is formed by the frame body 10 and the mold base 40. More specifically, a space S is defined by the skin plate 11 of the frame body 10, the main girders 12 a and 12 b, the joints 13 a and 13 b, and the recess 41 of the mold base 40.

Next, another pipe member 50 is attached to the pipe member 20 of the frame 10 from above. More specifically, as shown by a two-dot chain line in FIG. 3, another pipe member 50 has a screw thread 51 on its outer peripheral surface, and the other pipe member 50 has a screw thread 51 with the pipe member 20. By being screwed with a screw thread 23a formed on the inner surface, the tube member 20 is connected to the tube member 20 in a state of protruding toward the outside of the frame body 10.
Since the pipe member 20 and the other pipe member 50 are attached to each other via the screw threads 23a and 51, the other pipe member 50 can be detached from the pipe member 20 after the concrete is placed.

Next, the concrete is placed in the space S defined by the frame body 10 and the mold base 40 through another pipe member 50 and the pipe member 20. Specifically, as shown by an arrow, the placed concrete is introduced from another pipe member 50 and flows into the space S through the opening 25 of the pipe member 20.
At the time of placing concrete in the space S, the concrete flows into the space S through the opening 25 as described above, and the air in the space S pushed out by the concrete flowing into the space S becomes the openings 25 and It is discharged to the outside through another pipe member 50.
The placing of the concrete is performed until the concrete accumulates at a predetermined height in another pipe member 50. That is, the process is finished after confirming that the concrete overflows from the frame 10 into another pipe member 50.

  Next, after completion of placing the concrete, another pipe member 50 is removed from the pipe member 20, and the concrete in the through hole 11a is leveled while removing the overflowed concrete.

  Thereafter, the concrete is cured and solidified, whereby the concrete and the frame body 10 are integrated, and the filling body 30 is formed, thereby completing the segment 1.

  Finally, the segment 1 is removed from the mold base 40, and the manufacturing process of the segment 1 is completed.

<Action, effect>
According to the segment 1 having the frame body 10 and the filling body 30 having the above-described structure, the groundwater infiltrated through the through hole 11 a by the welded portion W can enter the segment 1 along the inner surface of the skin plate 11. Furthermore, the ground water that has passed through the opening 25 along the inner peripheral surface of the pipe member 20 is expanded by absorbing water by the water-expandable seal members 26a and 26b provided so as to sandwich the opening 25. Since the sealing members 26a and 26b prevent entry from the region sandwiched between the sealing members 26a and 26b into other regions, leakage of water from the inner wall side of the segment 1 to the tunnel can be prevented. That is, the water-expandable seal members 26a and 26b absorb water and self-expand, and reliably block the water passage at the contact point between the seal members 26a and 26b and the filling 30 to prevent water leakage. It is preventing. Thereby, the deterioration of the filling 30 due to the penetration of water into the segment 1 can be suppressed, and the labor for treating the water leaking from the segment 1 can be greatly reduced.

  Further, since the other end of the pipe member 20 that is not connected to the skin plate 11 is closed by the plug 22, the water that has entered the inside of the pipe member 20 is prevented while preventing leakage at the time of placing concrete. In the lower end of the pipe member 20, it is possible to prevent leakage from the inner wall side of the segment 1 into the tunnel.

  Moreover, since the plug 22 is detachably attached to the pipe member 20, the inside of the segment 1 and the drainage of water can be easily performed. In particular, when the seal member 24 is provided between the plug 22 and the pipe member 20, the water stop effect can be further enhanced.

  Furthermore, according to the manufacturing method of the segment 1 having the above structure, the welded portion W prevents water from entering the inside of the segment 1 along the inner surface of the skin plate 11, and the water-expandable seal member 26a, Since 26b absorbs water and expand | swells, the penetration | invasion path | route of water is interrupted | blocked, The segment 1 which has a high water stop effect can be manufactured. Furthermore, since one end of the pipe member 20 is provided with a screw thread 23a, it is not only used for filling concrete, but also exhausts air from the inside of the space S to the outside during filling of the concrete into the space S. Since it is possible to easily attach another pipe member 50 that can also be used for the purpose, it is not necessary to form an air vent hole in the skin plate 11 separately from the through hole 11a for filling concrete, and the segment 1 It can be manufactured easily.

<Others>
The present invention is not limited to the above embodiment. For example, the number and formation location of the through holes 11a formed in the skin plate 11 can be changed as necessary.

  The shape of the through hole 11a is not particularly defined, but the cross-sectional shape of the pipe member 20 connected to the through hole 11a can be changed corresponding to the through hole 11a.

  In addition, the shape of the opening 25 is not limited to a rectangle as long as it does not prevent the inflow of concrete into the frame body 10, and may be a circle, an ellipse, a triangle, a polygon, or the like.

1 Segment 10 Frame 11 Skin Plate 11a Through Holes 12a, 12b Main Girder 13a, 13b Joint 20 Pipe Member 21 Supply Port 22 Plug (Closing Member)
22a, 22b Thread 24 Seal member 25 Openings 26a, 26b Seal member 30 Filling body 40 Form frame 50 Another pipe member S Space W Welded part

Claims (8)

A frame of a segment that builds a wall in a borehole,
A skin plate forming the outer wall of the segment and having at least one through hole;
A side wall plate standing on an edge of the skin plate to form a side wall of the segment;
Provided on the inner surface side of the skin plate so as to surround the through hole, one end connected to the water-tight to the skin plate, and the tube member having at least one opening in a wall,
A water-expandable seal member densely provided on the outer wall surface of the tube member so as to sandwich the opening in the axial direction of the tube member;
The frame of the segment characterized by comprising. Frame segment as claimed in claim 1, characterized in that it comprises a closure member for closing the other end of the tube member.   The frame of a segment according to claim 2, wherein the closing member is detachably provided in the tube member.   The segment frame according to claim 2 or 3, further comprising a water stop member provided between the closing member and the pipe member.   5. The segment frame according to claim 1, wherein the pipe member includes an attachment / detachment portion that allows the other pipe member to be attached / detached at the one end.   The segment frame according to any one of claims 1 to 5, wherein the one end of the pipe member is welded to the skin plate. A method of manufacturing a segment using the segment frame according to any one of claims 1 to 6,
Installing the frame on a mold base with the skin plate facing upward;
Attaching another pipe member to the one end of the pipe member so as to protrude outside the skin plate;
Supplying the filling material to the space surrounded by the skin plate, the frame body, and the mold base through the another tube member and the tube member to form the filling body;
Removing the another pipe member from the pipe member after forming the filling body;
A method for producing a segment, comprising: A frame of the segment according to any one of claims 1 to 6,
A filling body provided in a space surrounded by the skin plate and the side wall plate of the frame body;
A segment characterized by comprising:

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