JP4159324B2 - Branch segment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branching segment used in a tunnel having a multiple structure, and more particularly to a technique capable of effectively increasing the strength without increasing the size of the branching segment.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, branching segments used in multiple tunnels for subways, motorways and the like are tunnel segments for forming a tunnel wall by connecting a large number of them in the circumferential direction and the axial direction of the tunnel. A pair of left and right pillars that are located in the middle in the tunnel width direction, and that are connected to the upper or lower side of the middle pillar that receives the segment load, and a pair of left and right members that extend from the pillar holder to both sides in the tunnel width direction. Segment connecting portion.
[0003]
The branching segment often has a substantially V-shape when viewed in the tunnel axial direction, and is sometimes called a “seagull segment”. As such a branching segment, for example, the one shown in FIG. 2 of JP-A-9-317392 is known.
[0004]
[Problems to be solved by the invention]
The branching segment shown in the above publication is a stepped wall in which the outer peripheral wall of the metal segment body is shifted inward in the tunnel radial direction in the tunnel axial direction, and the outer diameter of the tunnel is formed by the stepped shape. The structure is a so-called corrugated segment in which a hollow portion formed in a state opened to the side is filled with concrete.
[0005]
For example, in a tunnel curve section such as a subway curve, the segment width in the tunnel axis direction is required to be shorter than the segment width of the tunnel straight section, but in a corrugated segment with a relatively complicated cross-sectional shape. It is difficult to set the tunnel axial direction width to be narrower.
[0006]
Therefore, in the tunnel curve part, the segment strength is slightly inferior to that of the corrugated type, but the so-called main girder type segment, which is easy to mass-produce even if the tunnel axial width is narrower, has to be used due to the simple shape of the mold. There is. However, when the main girder structure is adopted for the branching segment, it becomes a problem how to compensate for the strength decrease accompanying the change in the basic shape of the segment.
[0007]
In other words, the means to increase the segment strength by using a high-strength material causes an increase in the cost of the segment, and in order to increase the strength by increasing the thickness of the segment, it is essential to enlarge the tunnel cross-sectional area itself, which also increases the cost. To do. Thus, there seems to be room for improvement in order to realize the strength of the main girder segment while suppressing or eliminating the increase in size and cost.
[0008]
Therefore, an object of the present invention is to satisfy the strength of the branching segment, which is used in a multi-type tunnel or the like, having a strict required strength condition with a main girder type structure in which the tunnel axial width can be easily reduced. It is in the point to realize by devising.
[0009]
[Means for Solving the Problems]
〔Constitution〕
According to the first aspect of the present invention, in the branching segment, the first end wall formed with the connecting portion for the adjacent segment in the circumferential direction of the tunnel with respect to the outer circumferential wall portion that forms the outer circumferential wall of the tunnel, In addition, a pair of second end walls that form a connecting portion for adjacent segments in the tunnel axis direction are connected to both end sides in the tunnel axis direction, and span between the pair of second end walls. And in the middle part of the peripheral direction of the 2nd end wall, the column connection part arranged as a partial inner peripheral wall straddling a pair of said 2nd end walls is provided, and it has a box shape with a 5-side closure structure as a whole In addition, a reinforcing plate part integrally extending in a direction approaching each other is provided at the inner edge of the tunnel of the pair of second end walls, and these reinforcing plate parts are formed wider toward the column connecting part side. with some Te, the column connecting portion side of the two reinforcement plate portion Parts How to is characterized in that are connected together by transverse plate section provided in a connected state to a portion within the peripheral wall.
[0010 ]
[0011]
[Action]
According to the structure of claim 1, the branching segment is basically a box-type structure with an open bottom surface (five-surface closed structure), so that strength and rigidity are improved as compared with a conventional corrugated segment structure. It is advantageous in that it is easy to raise, and in addition, a reinforcing plate portion that is integrally extended in a direction close to each other is provided at the open portion thereof, that is, at the inner edge of the tunnel of the pair of second end walls. As a result, the section modulus and the rigidity are greatly improved as compared with the open type (5-side closed structure), and the strength and rigidity close to that of the complete box type (6-side closed structure) can be exhibited. Therefore, it is possible to greatly improve the strength by slightly increasing the size of the branching segment, or to increase the strength without increasing the size of the branching segment.
[0012]
Moreover, since the reinforcing plate portion is formed wider toward the column connecting portion side, it can be reinforced at the column connecting portion side where the strength condition such as bending moment becomes stricter, and a segment having a shape suitable for the strength condition can be formed. Can be configured.
[0013]
〔effect〕
In the branching segment according to claim 1, as a segment by a structural device that has a box shape close to a six-sided closed structure having a reinforcing plate portion provided on the inner edge of the tunnel of the pair of second end walls, As a result, it is possible to improve the strength without increasing the length (thickness) in the tunnel radial direction, dramatically increase the strength by slightly increasing the thickness, or reduce the thickness without changing the strength. For example, tunnel strength can be improved without changing the tunnel cross-sectional area, large tunnel cross-sectional area can be increased to increase tunnel strength, or tunnel cross-sectional area can be reduced while keeping the tunnel strength unchanged. It was possible to improve the function or reduce the cost to be rational and economical.
[0014]
In addition, by forming the reinforcing plate portion wider toward the column connecting portion side, the strength can be increased in a preferable state that is efficient and conforms to the required strength condition, and the effect by the configuration of claim 1 is enhanced. I was able to.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 (a) shows a perspective view of a multiple tunnel T, and FIG. 1 (b) 2 shows a front view thereof. This multiple-type tunnel T has a substantially laid-down Dharma-shaped cross-section that is a combination of two circular tunnels that are slightly overlapped, and is formed at the center in the tunnel width direction where the vertical width is narrowed down. The middle pillar 6 is connected to support the upper and lower sides.
[0016]
The multiple tunnel T is formed by forming a tunnel wall W by arranging a large number of segments S in the tunnel circumferential direction (arrow Y direction) and the tunnel axis direction (arrow X direction) and connecting them together. And, as a tunnel ring tr which is a unit tunnel by the width of one segment, a total of ten segments S including eight ordinary segments Sn, two branch segments S1 and S2, and one segment S It consists of the middle pillar 6.
[0017]
The branch segments S1 and S2 are positioned in the middle in the tunnel width direction among the tunnel segments S for forming the tunnel wall W by connecting a large number of them in the tunnel circumferential direction and the tunnel axis direction. These branching segments S1 and S2 have mutually different tunnel circumferential lengths. The first branching segment S1 having a long length and the second branching segment S2 having a short length are connected to adjacent tunnel rings. By alternately using at tr and tr, the connection strength in the tunnel circumferential direction is prevented from being aligned on one straight line in the tunnel axis direction, thereby improving the connection strength.
[0018]
In FIG. 1, the middle pillar 6 is drawn for each tunnel ring tr. However, depending on various conditions such as ground strength, for example, one middle pillar 6 may be provided for every two pairs of tunnel rings tr. It is possible to appropriately adopt a structure in which one middle pillar 6 is provided for every three sets.
[0019]
As shown in FIG. 4, the normal segment Sn includes substantially fan-shaped shaft end walls 24 and 24 positioned at both ends in the tunnel axial direction, peripheral end walls 25 and 25 positioned at both ends in the tunnel circumferential direction, and an outer peripheral wall 26. In addition, the box-like structure is made of ductile cast iron with a plurality of lateral ribs 27 connecting the pair of shaft end walls 24 and 24 in a state of being continuous with the outer peripheral wall 26. Each shaft end wall 24 has through holes 9 for passing a connecting tool such as a bolt between adjacent horizontal ribs 27 and between the horizontal ribs 27 and the peripheral wall 25 in the tunnel axial direction. A plurality of through-holes 8 are formed in each peripheral end wall 25 so as to pass a connector such as a bolt. In addition, all the lateral ribs 27 are formed in parallel with each other for the convenience of die removal using a mold having a split structure.
[0020]
As shown in FIG. 2, the first branching segment S1 is made of ductile cast iron and has a box shape, a structure close to a so-called “main girder type” (substantially main girder type). That is, a pair of first end walls 1, 1 positioned at both ends in the tunnel circumferential direction, a pair of second end walls 2, 2 positioned at both ends in the tunnel axial direction, the outer peripheral wall 3, and the partial inner peripheral wall 4 A pair of left and right reinforcing walls 5 and 5 and a plurality of horizontal ribs 7 in a state of being laid over both the second end walls 2 and 2 are integrally formed of ductile cast iron and configured in a box shape. .
[0021]
The partial inner peripheral wall 4 is a horizontal plate surface portion straddling the pair of second end walls 2, 2, and a column for connecting the middle column 6 receiving the segment load by connecting a plurality of bolts on the lower side thereof. It is comprised in the connection part a. The outer peripheral wall 3 is a curved plate surface portion formed so as to straddle the outer ends of the four walls of the pair of first end walls 1, 1 and the pair of second end walls 2, 2, and constitutes the tunnel wall W I'm about to do it.
[0022]
The first end walls 1, 1 straddle the pair of second end walls 2, 2 and have a substantially standing posture along the tunnel axis direction, and are formed on plate surface portions located at both ends in the tunnel circumferential direction. And constitutes a first connecting portion b connected to the peripheral end wall 25 of the ordinary segment Sn. This 1st end wall 1 is located in the location furthest from the column connection part a.
In addition, an example of the specific structure as the 1st connection part b is the some through-hole 8 for inserting connecting tools, such as a volt | bolt.
[0023]
The second end walls 2 and 2 are plate members in an upright position along the circumferential direction of the tunnel and exhibiting a substantially V-shape when viewed in the tunnel axial direction, and the column connecting portion a and the first end walls 1 and 1 They are connected to each other to form a second connecting portion c with a segment adjacent in the tunnel axis direction. An example of a specific structure as the second connecting portion c is a plurality of through holes 9 for inserting connecting tools such as bolts.
[0024]
The lateral ribs 7 are connected to the pair of second end walls 2, 2, the outer peripheral wall 3, and the reinforcing wall 5 as a pair of central lateral rib portions 7 a, 7 a, a pair of end lateral rib portions 7 c, 7 c, and A pair of intermediate lateral rib portions 7b, 7b located in the middle are formed at a total of six locations. The central lateral rib portion 7a and the intermediate lateral rib portion 7b are connected to each other, and the pair of left and right first vertical reinforcing ribs 10 and 10 separated from the partial inner peripheral wall 4 and the end lateral rib portion 7c are slightly The first end wall 1 is integrally formed with a pair of left and right second vertical reinforcing ribs 11, 11 in a triangular shape that is in contact with the same length as the width of the first end wall 1.
[0025]
The reinforcing wall 5 is connected to the first end wall 1, the pair of second end walls 2, 2, the four walls of the partial inner peripheral wall 4, and the first to first walls connected to the intermediate lateral rib portion 7 b and the end lateral rib portion 7 c. It is formed on the wall with the third three holes 5a, 5b, 5c. The holes 5a, 5b, and 5c are formed so that the width in the tunnel axial direction becomes wider from the first hole 5a on the partial inner peripheral wall 4 side toward the third hole 5c on the first end wall 1 side.
[0026]
In this case, the reinforcing wall 5 includes vertical side portions 51 and 52 at both ends in the tunnel axis direction, a first horizontal plate portion 53 in contact with the first end wall 1, a second horizontal plate portion 54 in contact with the end horizontal rib portion 7c, Considering the third horizontal plate portion 55 in contact with the intermediate horizontal rib portion 7 b and the fourth horizontal plate portion 56 in contact with the partial inner peripheral wall 4, the length in the tunnel axis direction of each of the vertical side portions 51, 52 is set to the partial inner peripheral wall 4. It can be said that it is set to become longer as it gets closer.
[0027]
In other words, the first branching segment S1 forms the connecting portion b (first connecting portion b) for the adjacent segment in the tunnel circumferential direction with respect to the outer peripheral wall portion 3 (outer peripheral wall 3) forming the tunnel outer peripheral wall W. A pair of first end walls 1 are connected to both ends in the circumferential direction of the tunnel, and a second end wall 2 that forms a connecting portion c (second connecting portion c) for adjacent segments in the tunnel axial direction. A pair of column connecting portions (partial inner peripheral walls) that are connected to both ends in the tunnel axis direction, extend between the pair of second end walls 2 and 2, and are arranged in the intermediate portion of the second end wall 2 in the circumferential direction. 4) is provided and is formed in a box shape as a whole, and is integrally extended to the tunnel inner end edges of the pair of second end walls 2 and 2 in the direction close to each other, and on the column connecting portion 4 side Reinforcing plate portions 51 and 52 (vertical side portions 51 and 52) formed so as to be wider are provided. To have.
[0028]
As shown in FIG. 3, the second branch segment S2 has a shape in which the length in the tunnel circumferential direction of the first branch segment S1 is extremely shortened, and a pair of first segments located at both ends in the tunnel circumferential direction. One end wall 12, 12, a pair of second end walls 13, 13 positioned at both ends in the tunnel axial direction, an outer peripheral wall 14, a partial inner peripheral wall 15, a pair of left and right reinforcing walls 16, 16, and both A pair of horizontal ribs 17 and 17 and a pair of vertical ribs 18 and 18 in a state of being laid over the end walls 13 and 13 and a pair of vertical ribs 18 and 18 are made of ductile cast iron and configured in a box shape.
[0029]
The reinforcing wall 16 is connected to the three walls of the pair of second end walls 13 and 13 and the partial inner peripheral wall 15 in a state having a through hole 16a whose tunnel axial direction width becomes shorter toward the partial inner peripheral wall 15 side. It is formed in a U-shaped plate-like part. Even in this case, the reinforcing wall 16 is considered as the vertical side portions 51 and 52 at both ends in the tunnel axis direction, the horizontal plate portion 56 in contact with the partial inner peripheral wall 15, and the horizontal plate portion 53 in contact with the first end wall 12. The lengths of the vertical side portions 51 and 52 in the tunnel axis direction become longer as they approach the partial inner peripheral wall 15.
[0030]
As shown in FIG. 5, the middle column 6 is a column made of ductile cast iron composed of a column main body 19 made of H-shaped steel and divergent portions 20, 20 formed at both ends thereof, and a plurality of bolts and nuts 22. It is comprised so that it can connect and integrate with the partial inner peripheral walls 4 and 15 using. The mounting wall 20a in the end spread part 20 is reinforced by a pair of triangular reinforcing ribs 21 and 21. The column main body 19 is formed with a plurality of lateral ribs (reference numerals omitted).
[0031]
[Another embodiment]
[0032]
<< 1 >> As shown in FIG. 7, the reinforcing wall 5 is connected to only the partial inner peripheral wall 4, the pair of second end walls 2, 2, and the intermediate lateral rib portion 7 b and the end lateral rib portion 7 c. The character-shaped reinforcement wall 5 may be sufficient.
[0033 ]
[0034]
<< 2 >> As shown in FIG. 8 , the first to third three holes 5a, 5b, and 5c are rectangular, and the widths in the tunnel axis direction are gradually increased in this order. The first branching segment S1 having the reinforcing wall 5 may be used.
[0035]
<< 3 >> As shown in FIG. 9, the tunnel may be created using the third branch segment S3 in which the left and right wing portions have different lengths in the circumferential direction of the tunnel. For example, if one of the left and right wing portions uses a third branching segment S3 set to the length of the first branching segment S1, and the other wing portion is set to the length of the second branching segment S2, respectively, As shown in FIG. 9, an arrangement structure in which the connecting surface portions in the tunnel circumferential direction are not aligned on a straight line in the tunnel axis direction, that is, a so-called staggered arrangement, is realized while using one kind of branching segment S3. There are advantages you can do.
[0036]
<< 4 >> As shown in FIG. 6, the reinforcing wall 5 is formed as a separate metal plate material by press forming or the like, and is integrated with the second end wall 2 or the like by welding to a segment body made of steel. You may make it make it.
[Brief description of the drawings]
FIG. 1 shows a multiple tunnel, (A) is a perspective view, (B) is a front view, and FIG. 2 shows a first branch segment, (A) is a sectional front view, and (B) is a bottom view. FIG. 3 shows a second branching segment, (A) is a sectional front view, (B) is a plan view [FIG. 4] A normal segment is shown, (A) is a sectional side view, and (B) is a plan view. 5A is a perspective view, FIG. 5B is a sectional side view, and FIG. 6 is a perspective view of a single product showing a reinforcing wall of the first branching segment. FIG. 7 is a first branching segment. FIG. 8 is a bottom view showing another shape of the first branch segment reinforcing wall. FIG. 9 is a perspective view showing a tunnel using the third branch segment. (B) is a front view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st end wall 2 2nd end wall 3 Outer peripheral wall part 51,52 Reinforcement board part a Column connection part b First connection part c Second connection part W Tunnel outer peripheral wall

Claims (1)

A pair of first end walls that form connecting portions to adjacent segments in the circumferential direction of the tunnel with respect to the outer circumferential wall that forms the outer circumferential wall of the tunnel are connected to both ends in the circumferential direction of the tunnel. A pair of second end walls that form connecting portions for adjacent segments are connected to both ends in the tunnel axis direction, span between the pair of second end walls, and in the circumferential direction of the second end wall. an intermediate portion, provided the columnar connection portion disposed as a partial inner circumferential wall spanning the pair of second end wall, thereby forming a box shape having an overall five-face closure structure, the pair of the second end Reinforcing plate portions extending integrally in the direction of approaching each other are provided at the inner edge of the tunnel in the wall, and these reinforcing plate portions are formed wider toward the column connecting portion side , and if the end of the post connecting portion side, like connecting to the part within the peripheral wall Branching segments are connected together by transverse plate portions provided.

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