JP2004076493A - Segment for tunnel, and structure of connection part thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the rational structure of a connection part of segments for a tunnel which can economically connect the segments with sufficient strength and which can improve connecting workability. <P>SOLUTION: In the segment for a cast iron tunnel having a pair of nearly fan-shaped shaft end walls 3 and 4 and a pair of peripheral end walls 1 and 2 as a connecting surface connected to an adjacent segment Sn in the circumferential direction of the tunnel and formed with dovetail grooves a1 and a2, in which a connector for connecting the adjacent segments S in the circumferential direction of the tunnel by relatively moving in the tunnel axial direction is fitted, both the dovetail grooves a1 and a2 are formed into bag structures that both ends in the tunnel axial direction do not reach either of the shaft end walls 3 and 4, and formed in only one part in an intermediate part in the tunnel axial direction of the peripheral end walls 1 and 2. Openings 11 and 14 for inserting the connector into the dovetail grooves a1 and a2 are formed in the peripheral end walls 1 and 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tunnel segment and a connecting portion structure thereof, and more specifically, a pair of substantially fan-shaped shaft end walls serving as connecting surfaces with segments adjacent in a tunnel axial direction, and a segment adjacent in a tunnel circumferential direction. A coupling tool having a pair of peripheral end walls serving as connecting surfaces of the above and a peripheral wall serving as a tunnel wall, and connecting the adjacent segments in the tunnel circumferential direction to each of the axial end walls by relative tunnel axial movement. The present invention relates to a tunnel segment in which a dovetail groove portion for fitting is formed.
[0002]
Alternatively, a first dovetail groove portion and a first dovetail portion provided separately so as to face each other at the butting portions of the first segment and the second segment which are assembled adjacently in the tunnel circumferential direction such that both butting portions face each other. A coupling tool having enlarged edges formed on both sides thereof that can be individually inserted by relative movement in the tunnel axial direction with respect to each of the two dovetails, the first and second dovetails respectively. The present invention relates to a connection structure technology for a tunnel segment configured to connect both butted portions relatively close to each other as they are fitted into the device.
[0003]
[Prior art]
A conventional connection structure of a tunnel segment includes, as shown in, for example, JP-A-11-093588, a method in which a dovetail groove extending in the tunnel axial direction is formed in a tunnel circumferential end wall of a segment. There is known a connector having a substantially gourd-shaped cross-section having enlarged edges formed at both ends. That is, in a state where the connecting tool is inserted into the dovetail groove of one segment, the pair of enlarged edges of the connecting tool are separated from each other by sliding the unprovided segment relative to the existing segment in the tunnel axis direction. If the non-installed segment is moved to a predetermined position in the tunnel axial direction by the action of the taper shape, it has been configured such that segments adjacent in the tunnel circumferential direction can be firmly connected and integrated.
[0004]
[Problems to be solved by the invention]
According to the prior art, the dovetail groove is formed over the entire width of the segment in the tunnel axial direction. Therefore, if the shape and size of the segment are different, for example, a mold for forming a dovetail groove during casting is used. Also, the core had to be changed, which was economically disadvantageous in that the core cost was high. Since the dovetail groove has an open shape with its end reaching the axial end wall of the segment, there is also a disadvantage in terms of strength that the dovetail portion is easily opened and deformed with the insertion of the coupler. Was. In addition, since two connecting tools are used for each butting portion in the segment, the connecting operation is relatively troublesome, and the workability is not satisfactory.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a connection structure for a tunnel segment that can be sufficiently connected economically with sufficient strength and that improves connection workability.
[0006]
[Means for Solving the Problems]
As shown in FIGS. 1, 2, and 9, a pair of shaft end walls 3 and 4 having a substantially fan shape and serving as a connecting surface between adjacent segments S in the tunnel axis direction are provided. A pair of peripheral end walls 1 and 2 serving as connecting surfaces with the segments S adjacent in the direction and a peripheral wall 5 serving as a tunnel wall W. In the tunnel segment in which the dovetail grooves a1 and a2 for fitting the connecting tool R so that the segments S adjacent in the direction are connected,
Both dovetails a1 and a2 are formed in a bag structure in which both ends in the tunnel axis direction do not reach any of the axial end walls 3 and 4, and only one intermediate portion of the peripheral end walls 1 and 2 in the tunnel axial direction. It is characterized in that openings 11 and 14 for inserting the connecting tool R into the dovetail grooves a1 and a2 are formed in the peripheral end walls 1 and 2.
[0007]
According to a second aspect of the present invention, as illustrated in FIGS. 1, 2, and 10, each of the butting portions 1 and 2 of the first segment S and the second segment S that are assembled adjacently in the tunnel circumferential direction, The first dovetail groove a1 and the second dovetail groove a2, which are separately provided so that the two butted portions 1 and 2 face each other in a butted state, can be individually fitted by relative movement in the tunnel axial direction. The connecting tool R having the enlarged edges 17 and 18 formed on both sides is inserted into the first and second dovetail portions a1 and a2 as the respective enlarged edges 17 and 18 are fitted into the first and second dovetail portions a2. In a connecting portion structure of a tunnel segment configured to connect the two relatively close to each other,
Each of the dovetail grooves a1, a2 has a bag structure in which both ends in the tunnel axial direction do not reach any of the tunnel axial end walls 3, 4 in each of the segments S, S, and the tunnel in each of the butting portions 1, 2. It is characterized in that it is formed only at one position of the intermediate portion in the axial direction, and openings 11 and 14 for inserting the connector R into the dovetail grooves a1 and a2 are formed in the butting portions 1 and 2.
[0008]
Note that, as described above, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a tunnel ring tr and a tunnel T formed by using a plurality of tunnel segments S according to the present invention, and FIGS. 1 to 6 show the tunnel segments S, respectively. The tunnel ring tr, which is one unit as a tunnel whose width in the tunnel axis direction (direction of arrow A) is one segment, connects, for example, seven segments S in the tunnel circumferential direction (direction of arrow B), A tunnel T is formed by connecting a large number of tunnel rings tr in the tunnel axis direction.
[0010]
In this case, the tunnel ring tr includes four normal segments Sn, a key segment Sk having tapered surfaces at both ends in the tunnel circumferential direction, and a total of two pieces arranged on both sides of the key segment in the tunnel circumferential direction. It is composed of seven segments S including tapered joining segments Sa and Sb. The width dimension of each segment S in the tunnel axis direction is set to 500 mm, which is relatively short.
[0011]
As shown in FIGS. 2 to 6, the ordinary segment Sn includes a pair of peripheral end walls (an example of abutting portions) 1 and 2 along the tunnel axial direction so as to face adjacent segments in the tunnel peripheral direction, and a tunnel peripheral direction. , A pair of shaft end walls 3 and 4 having a substantially fan shape, an outer peripheral wall 5 along the tunnel circumferential direction to form a tunnel wall, and a plurality (six places) formed over the shaft end walls 3 and 4. It is composed of a box-shaped cement body h made of ductile cast iron having a horizontal rib 6 and a concrete portion c filled in the body h. An erector hole 9 whose periphery is reinforced by a partial vertical rib 10 is formed in the center of the outer peripheral wall 5.
[0012]
As shown in FIGS. 3 and 4, the concrete portion c is reinforced by vertical and horizontal reinforcing members 36 and 37, and has a plurality of suspension members separated from each other in the tunnel circumferential direction at the center in the width direction (tunnel axial direction). Hanging reinforcing bars 40 are buried. A drain hole 38 is formed at the root of each lateral rib 6 on the outer peripheral wall 5 side, and a hanging reinforcing bar 40 is hooked on the drain hole 38 to prevent the concrete portion c from coming off from the segment body h. It is designed to function as.
[0013]
Each horizontal rib 6 is formed at equal intervals (9 degrees) in the tunnel circumferential direction, and the first and sixth horizontal ribs at both ends and the peripheral end walls 1 and 2 have a half interval (4.5) of the uniform interval. Degrees). Therefore, the circumferential interval between the lateral ribs 6, 6 at the ends of the segments S, S adjacent in the tunnel circumferential direction is also 9 degrees. Male and female joints 7, 8 are distributed on the shaft end walls 3, 4 at a total of three places between the horizontal ribs 6 for each jump. It is configured so that adjacent segments can be connected in the tunnel axis direction.
[0014]
As shown in FIGS. 5 and 6, a first dovetail groove portion a1 and a second dovetail groove portion a2 are formed separately on the peripheral end walls 1 and 2. The first dovetail portion a1 formed in the first peripheral end wall 1 has an entrance portion (an example of an opening portion) 11 through which a first enlarged edge portion 17 of the connecting tool R described later passes, and a throttle portion 12 following the entrance portion. A second dovetail groove a2 formed in the second peripheral end wall 2 has a receiving portion 13, and a supply / discharge port (an example of an opening) 14 for inserting the second enlarged edge portion 18 of the connector R. And a constricted portion 15 and a spare portion 16 which follow, and the dovetail grooves a1 and a2 do not reach any of the shaft end walls 3 and 4, that is, a bag structure which does not open in the tunnel axial direction. Is formed.
[0015]
As shown in FIG. 7, the first connecting member R1 for the ordinary segment Sn is a connecting body 20 having a substantially C-shape in plan view and configured by integrating enlarged edges 17, 18 at both ends with an intermediate portion 19. And a backup material 21 screwed to the distal end of the first enlarged edge 17. The first enlarged edge portion 17 and the second enlarged edge portion 18 have a taper angle of being separated from each other as going from the side where the backup material 21 is mounted to the opposite side. A guide portion 22 extending laterally outward is integrally formed on the outer side surface.
[0016]
As shown in FIGS. 5 and 6, a guide groove 30 is formed in each of the peripheral end walls 1 and 2 on the inner diameter side of the dovetail grooves a1 and a2 and along the tunnel axial direction. The guide groove 30 of the first peripheral end wall 1 opens only in the wellhead-side shaft end wall 4 and is an extension of the guide groove, and is screwed into a position closer to the face-side shaft end wall 3 than the guide groove 30. The guide groove 30 of the second peripheral end wall 2 is opened only on the face side shaft end wall 3 and is an extension of the guide groove 30 and is located closer to the wellhead side shaft end wall 4 than the guide groove 30. A guide pin 31 to be screwed to is provided. In other words, at the time of the segment connection operation described later, the guide pin 31 fits in the guide groove 30 of the opponent, so that the adjacent segments S, S exhibit a guide function in which the positions are not displaced in the tunnel radial direction.
[0017]
FIG. 10 shows a connection operation procedure of the ordinary segments Sn in the tunnel circumferential direction. First, the first enlarged edge portion 17 of the connecting tool R is fitted into the first dovetail portion a1 of the first peripheral end wall 1 of the existing segment Sn, and the backup material 21 is brought into contact with the receiving surface 13a of the receiving portion 13. [Refer to FIG. 10 (a)].
[0018]
Next, the unsegmented segment Sn adjacent in the tunnel circumferential direction is moved in the tunnel circumferential direction, and the second enlarged edge 18 is inserted into the supply / discharge port 14 of the second peripheral end wall 2 (see FIG. 10B). . At this time, a guide state in which the respective guide pins 31 are fitted into the respective guide grooves 30 appears.
[0019]
Then, the unsegmented segment Sn is moved from the face side to the wellhead side along the tunnel axis direction, so that the pair of projecting portions 23, 23 of the second dovetail portion a2 and the second enlarged edge portion 18 have a mutual taper action. As a result, the existing and non-installed segments are attracted to each other, and can be firmly connected and integrated [see FIG. 10 (c) and FIG. 9]. The backup material 21 exerts a known function of bringing the segments Sn into a predetermined tension state by being appropriately deformed.
[0020]
As shown in FIGS. 1 and 11, the key segment Sk has two circumferential end walls 26 and 27 such that the circumferential length of the face side shaft end wall 24 is longer than the circumferential length of the wellhead side shaft end wall 25. Is small and has a taper angle, and can be connected across a pair of joint segments Sa and Sb by moving from the face side to the wellhead side. That is, after inserting the first enlarged edge portion 28 of the second connecting member R2 into both dovetail grooves a4 and a4 of the bag structure in the key segment Sk, the guide pin 34 is screwed into the dovetail groove portion a4, and both peripheral end walls thereof are provided. In a state in which the second connecting member R2 and the guide pin 34 are provided in each of the members 26 and 27, they are put into a state of straddling both the joining segments Sa and Sb.
[0021]
As shown in FIGS. 1 and 11, each of the joining segments Sa and Sb has a taper angle opposite to the key segment Sk only on one of the pair of peripheral end walls on the key segment side. Otherwise, it is the same as the ordinary segment Sn. The dovetail groove portion a3 of the tapered peripheral end wall 32 reaches the face side shaft end wall 33 (opens to the face side shaft end wall 33) so that the key segments Sk can be connected by sliding movement along the tunnel axis direction. Have been.
[0022]
As shown in FIG. 8, the second connecting member R2 used for connecting the key segment Sk and the joining segments Sa and Sb has a tapered angle of the first enlarged edge portion 28 to which the backup material 21 is screwed, and the first connecting member R2 has a first connecting edge. The intermediate portion 29 is formed so as to be larger than the first enlarged edge portion 17 of the tool R. Otherwise, it is the same as the first connector R.
[0023]
For reference, FIG. 1 is an exploded perspective view showing an assembling relationship of the segments Sn, Sa, Sb, and Sk. That is, the third one of the four ordinary segments Sn is provided with the first connecting tool R1 on both peripheral end walls 1 and 2, and the other three ordinary segments Sn are provided on one peripheral end wall 1 or 2 on one side. Only the first connector R1 will be provided. In each of the segments S, there are provided two upper and lower (small and large tunnel diameters) sealing grooves 39, 39 on the peripheral end walls 1, 2 and the shaft end walls 3, 4.
[0024]
[Another embodiment]
<1> Both ends of the segment in the circumferential direction, that is, both joints in which the dovetail grooves a1 and a2 and the guide groove 30 are formed are formed of a cast product, and the segment body is formed of a steel product. The present invention may be applied to a segment S having a structure in which the segment and the segment main body are connected and integrated by a connecting means such as a bolt.
[0025]
<2> Both ends of the segment in the circumferential direction, that is, both joint portions where the dovetail grooves a1 and a2 and the guide groove 30 are formed are formed by casting, and the segment body is made of a concrete (RC) product (or concrete and The present invention may be applied to a segment S which is formed of a synthetic product made of metal, and has a structure in which the joint portion and the segment body are connected and integrated by a connecting means such as a bolt.
[0026]
【The invention's effect】
As described above, in the tunnel segment according to the present invention, the dovetail groove has a bag structure in which both ends in the tunnel axial direction do not reach any axial end wall, and an intermediate portion in the tunnel axial direction in the peripheral end wall. And the opening for inserting the connector into the dovetail groove is formed in the peripheral end wall. Therefore, even if the width of the segment in the axial direction of the segment is changed, a single dovetail groove may be used. It is only necessary to prepare one kind of core for forming the dovetail groove at the time of molding, and it is possible to reduce the cost of the mold as compared with the conventional means in which the core for the dovetail groove is also changed according to the segment change. Will be possible.
[0027]
Only one connecting tool to be fitted into the dovetail portion is used for one peripheral end wall (butting portion) in the segment, so that the operation labor and cost can be reduced as compared with the conventional case using two pieces. it can. In addition, since both ends of the dovetail groove in the tunnel axial direction are closed bag structures, the opening deformation resistance when the connector is inserted is significantly improved and more robust than in the conventional case where it was opened. It could be provided as a reasonable thing that could be linked.
[0028]
Also, the same effect as described above could be obtained with the tunnel segment connecting portion structure according to the present invention.
[Brief description of the drawings]
FIG. 1 is a perspective view of a tunnel and an exploded perspective view of a tunnel ring. FIG. 2 shows a normal segment body, (a) is a sectional side view, and (b) is a bottom view. FIG. 4 is a sectional view of FIG. 3; FIG. 5 is a front view showing one peripheral end wall of the ordinary segment; FIG. 6 is a front view showing the other peripheral end wall of the ordinary segment; FIG. (A) is a front view, (b) is a plan view [FIG. 8] shows a second connector, (a) is a front view, (b) is a plan view [FIG. 9] connection structure of ordinary type segments (A) is a cross-sectional side view, (b) is a cross-sectional plan view. [FIG. 10] (a) to (b) are action diagrams showing a procedure for connecting segments. [FIG. 11] shows a key segment connecting structure. , (A) is a cross-sectional side view, (b) a cross-sectional plan view
1, 2 peripheral end wall, butted portion 3, 4 shaft end wall, tunnel axial end wall 5 peripheral wall 11, 14 opening 17, 18 enlarged edge a1, a2 dovetail groove S segment R connector W tunnel wall

Claims (2)

It has a pair of substantially fan-shaped shaft end walls serving as connection surfaces with adjacent segments in the tunnel axial direction, a pair of peripheral end walls serving as connection surfaces with adjacent segments in the tunnel circumferential direction, and a peripheral wall serving as a tunnel wall. A tunnel segment in which a dovetail groove for inserting a connecting tool is formed on each of the peripheral end walls so that segments adjacent in the tunnel circumferential direction are connected by relative tunnel axial movement,
The coupling tool has a dovetail structure in which both ends of the dovetail portion in the tunnel axial direction do not reach any of the shaft end walls, and are formed only at one portion of the peripheral end wall at an intermediate portion in the tunnel axial direction. A tunnel segment formed in the peripheral end wall with an opening through which the dovetail groove is inserted. A first dovetail portion and a second dovetail portion respectively provided so as to oppose the butting portion of the first segment and the second segment which are assembled adjacent to each other in the tunnel circumferential direction so that the butting portions face each other. A connecting tool having enlarged edges formed on both sides thereof that can be individually inserted by relative movement in the axial direction of the tunnel with respect to the grooves, respectively. Along with the fitting, the connecting portion structure of a tunnel segment configured to connect the butting portions relatively close to each other,
The two dovetail portions are formed in a bag structure in which both ends in the tunnel axial direction do not reach any of the tunnel axial end walls in each of the segments, and are provided at one location of an intermediate portion in the tunnel axial direction in each of the butting portions. And a tunnel segment connecting portion structure in which an opening for allowing the connecting tool to pass through the dovetail groove is formed in the butting portion.

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