JP5462446B2 - Underground structure - Google Patents

Description

  The present invention relates to an underground structure.

  Patent Document 1 discloses an underground structure built using a plurality of tunnels arranged side by side. As shown in FIG. 6 (a), this underground structure 100 is constructed with a plurality of tunnels T, T,... (6 in the figure), and then an unnecessary lining L ′ for each tunnel T, T,. Is formed by forming a permanent bottom plate, side walls, etc. using the remaining linings L, L,... Of the tunnels T, T,. The plurality of tunnels T, T,... Are sequentially constructed with a time difference, and the subsequent tunnel T is constructed next to the preceding tunnel T. Each tunnel T is constructed by a propulsion method or a shield method.

  Here, the propulsion method is a method of constructing a tunnel by press-fitting a cylindrical propelling box, which is a tunnel lining, into the ground sequentially from a wellhead. In addition, a blade edge, an excavation machine, etc. are attached to the front-end | tip of a propulsion box. The propulsion method excavator may be one that propels itself by reacting to the propulsion box (that is, one that is equipped with a propulsion jack), or the thrust of the main jack transmitted through the propulsion box You may dig by. On the other hand, the shield method is a method of excavating a natural ground with an excavator installed at a tunnel face and assembling a segment to be a tunnel lining inside the excavator to construct a tunnel. In addition, a shield machine will dig itself by taking a reaction force to the segment assembled in the inside.

By the way, in the underground structure of patent document 1, as shown in FIG.6 (b), the lining (namely, segment and propulsion box) La of one tunnel T1 among two adjacent tunnels T1 and T2 is shown. The guide groove D is formed along the tunnel axis direction, and the ridge P that slidably fits in the guide groove D of one lining La is formed on the lining Lb of the other tunnel T2. Is formed. If it does in this way, it becomes possible to construct the lining Lb (La) of the succeeding tunnel T2 (T1) by guiding the lining La (Lb) of the tunnel T1 (T2) constructed in advance. Therefore, it becomes difficult to produce a shift between adjacent tunnels, and as a result, it becomes possible to construct efficiently.
Japanese Patent Laying-Open No. 2006-90099 ([0020], FIG. 4)

However, in the underground structure 100, since the guide groove D (joint) is formed in the lining La of the tunnel T1, when the unnecessary lining L ′ is removed, a location adjacent to the joint portion. In FIG. 2, part of the linings La and Lb is left so as to project to the inner space side. Further, when the adjacent tunnels T1 and T2 are connected, they cannot be fixed at the portion where the guide groove D (joint) is formed, and it is difficult to install the main reinforcing bar and the distribution reinforcing bar. It was.
As described above, when the linings La and Lb are left in a state of projecting to the inner space side, protruding portions are formed on the inner air cross section of the underground structure 100, and use of the inner space of the underground structure 100 is performed. There were cases where restrictions were imposed.

  The present invention has been made to solve the above-mentioned problems, and is an underground structure constructed using a plurality of tunnels arranged side by side, and ensures a wide effective inner space. The problem is to propose an underground structure that can be used.

In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a top plate, a bottom plate, and a side wall are formed by lining facing a natural ground of a plurality of tunnels arranged side by side. An underground structure formed by removing a lining facing another tunnel among the linings, wherein the top plate is attached to each of the linings facing the ground of two adjacent tunnels. The base plate or the side wall is provided with a protruding portion that protrudes toward the ground, and a joint portion that connects the linings facing the ground is formed at the protruding portion, and the joint portion includes two adjacent tunnels. A guide groove which is formed by a groove member arranged inside the protruding portion of one of the tunnels and opens to the other tunnel side, and a protruding member fixed to the outer peripheral surface of the protruding portion of the other tunnel. Formed and inserted into the guide groove And ridges that are characterized by comprising, a water stop agent is injected around the protrusion.

  According to such an underground structure, the joint portion between the tunnels is formed so as to protrude toward the natural mountain side, so that a portion having a cross-sectional defect is not generated in the main body portion of the lining. That is, according to this underground structure, since it is not necessary to project a lining on the inner space side, it is possible to increase the effective sectional area of the inner space of the underground structure.

Moreover, since the tunnels are difficult to separate from each other by the joint portion, a high-quality underground structure is obtained. Moreover, since the water-stopper is injected, the penetration of groundwater into the underground structure is prevented.

  Further, if the ridge is formed with a portion bent in an L shape, and the tip of the ridge is arranged in the vicinity of the outer surface of the lining, a joint arranged outside the main girder It becomes possible to inject the water-stopper into the part more easily.

Further, if a recess having a shape capable of pipe piping is formed at the tip of the protrusion, a water stop agent injection pipe is inserted into the recess to inject the water stop agent around the protrusion. Therefore, it is possible to easily stop the joint portion composed of the guide groove and the protrusion, which is preferable.

  Furthermore, the two adjacent tunnels may be connected by a grid plate disposed across the lining of both tunnels.

  According to the present invention, it is possible to secure a wider effective inner space for an underground structure built using a plurality of tunnels arranged side by side.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

  As shown in FIG. 1, the underground structure 1 according to the present invention includes six tunnels T <b> 1 to T <b> 6 arranged in parallel in the cross section (hereinafter, when the tunnels T <b> 1 to T <b> 6 are not distinguished, simply “tunnel T”). In other words, the top plate 1A, the bottom plate 1B, and the side walls 1C and 1C are provided. Note that the number of tunnels T constituting the underground structure 1 is not limited, and can be set as appropriate. Moreover, the cross-sectional shape of the underground structure 1 is not limited, and can be set as appropriate.

  Each of the linings L, L of the two adjacent tunnels T, T constituting the underground structure 1 is provided with a protruding portion S protruding to the natural ground side. A joint portion J1 that connects L is formed.

  As shown in FIG. 2, of two adjacent tunnels T, T, a guide groove D1 formed integrally with the projecting portion S of one tunnel T and opened to the other tunnel side, and a cover of the other tunnel T are covered. A protrusion P1 formed integrally with the work (protrusion S) and inserted into the guide groove D1 and a water stop agent 18a injected around the protrusion P1 are provided. And the recessed part P11 is formed in the front-end | tip at the protrusion P1.

  The protrusion P1 is provided with a portion bent in an L shape, and its tip (concave portion P11) is disposed in the vicinity of the outer surface of the lining L of one tunnel T (the surface desired for the natural ground).

  Moreover, one tunnel T and the other tunnel T are connected by the eyeplate 20 arrange | positioned straddling L and L of both tunnels T and T. FIG.

  The tunnel T can be constructed by the propulsion method or the shield method, but in this embodiment, it is constructed by the propulsion method. That is, in this embodiment, the lining L of each tunnel T is composed of a plurality of propelling boxes 10, 10,... (See FIG. 3) connected in the tunnel axis direction.

  As shown in FIG. 3, the propulsion box 10 includes an outer shell 11 formed in a rectangular tube shape, and a plurality of main girders 12, 12,... Arranged in parallel at a predetermined interval in the tunnel axis direction. Are arranged along the tunnel axis direction between the adjacent main girders 12 and 12. The propulsion box 10 is not limited to the one integrated in advance as described above. For example, the propulsion box 10 is formed by assembling a plurality of segments each including a main girder, a vertical rib, and a skin plate. The body 10 may be used.

The outer shell 11 is composed of a plurality of steel skin plates 111, 111,... Joined by welding, and has a substantially rectangular cross section as a whole.
The upper surface and the side surface of the outer shell 11 of the propulsion box 10 shown on the right side of FIG. 3 are formed by three large and small skin plates 111, respectively, and a gap 11a is formed between the adjacent skin plates 111, 111. Is formed. The gap 11a extends in the tunnel axis direction and is an opening of the guide grooves D1 and D2.

  The main girder 12 includes four steel plate members 121 to 124 arranged in a frame shape along the inner surface of the outer shell 11, and the plate members 121 to 124 are joined to the inner peripheral surface of the outer shell 11 by welding. Has been. In the propulsion box 10 shown on the right side of FIG. 3, the lower plate members 121 whose lower ends of the two left and right plate members 123 and 124 out of the four plate members 121 to 124 intersect with each other at a right angle correspond to the protrusion S. It protrudes to the natural mountain side (lower side).

  In addition, L-shaped notches are formed in the protruding portions of the left and right plate members 123 and 124 corresponding to the guide grooves D1. Further, T-shaped notches corresponding to the guide grooves D <b> 2 are formed in the vicinity of the corners of the main girder 12 on the left and right of the upper portions of the plate members 123 and 124 and on the left and right of the upper plate member 122.

  The vertical rib 13 is made of a steel plate material joined to the inner peripheral surface of the outer shell 11 by welding. In addition, the edge part of the longitudinal direction of the vertical rib 13 is joined to the side surface of the main girder 12 by welding.

Further, the propelling box 10 has both or one of the groove members 14 and 15 serving as the guide grooves D1 and D2 and the projecting members 16 and 17 serving as the protrusions P1 and P2 attached in the vicinity of the corner portion of the outer shell 11. It has been. The positions and the number of the guide grooves D1, D2 and the protrusions P1, P2 are appropriately set according to the position of the tunnel T (see FIG. 5B). Further, the joint portion J2 (the guide groove D2 and the protrusion P2) may be disposed as necessary and may be omitted.

As shown in FIG. 3, the groove member 14 constituting the guide groove D <b> 1 is disposed along the gap 11 a on the inner peripheral surface of the outer shell 11 in the protruding portion S of one tunnel T (T <b> 1).
As shown in FIG. 2, the groove member 14 is arranged so as to narrow the width of the U-shaped cross section (groove shape) 141 disposed at the base end portion of the protruding portion and the opening of the shape member 141. The pair of lid pieces 142 and 143, and the strip pieces 144 and 145 combined in an L shape connecting the gap 11a of the outer shell 11 from the tip of the one lid piece 143. The portion surrounded by the shape member 141 and the lid pieces 142 and 143 constitutes the wide portion 14b of the guide groove D1, and the portion surrounded by the lid piece 142 and the strip pieces 144 and 145 constitutes the narrow portion 14a of the guide groove D1. It is composed.

  The shape member 141, the cover pieces 142 and 143, and the strip pieces 144 and 145 are made of steel members and are joined to each other by welding. Moreover, the gap 11a side tips of the lid piece 142 and the strip 145 are joined to the inner surface of the outer shell 11 by welding.

  As shown in FIG. 3, the projecting member 16 constituting the projecting ridge P1 is disposed along the tunnel axis direction on the outer peripheral surface of the outer shell 11 of the other tunnel T (T2), and its projecting end portion is the outer shell. 11 protrudes outside. As shown in FIG. 2, the protruding member 16 includes a rail 161 disposed on the outer peripheral surface of the outer shell 11, a presser plate 162 disposed on the inner peripheral surface of the outer shell 11, and a flange 161 a of the rail 161. Are provided with bolts 163, 163,... Penetrating the presser plate 162, and nuts 164, 164,.

  The rail 161 is made of hot stamped steel and has a flange 161a that is fixed to the outer peripheral surface of the outer shell 11, an L-shaped web 161b that rises from the flange 161a, and a head formed at the protruding end portion of the web 161b. 161c. The head 161c has a substantially U-shaped cross-section and has a recess 161d. The head 161c is disposed in the vicinity of the lining L of one tunnel T1, and the recess 161d (recess P11) faces the bottom surface of the groove member 14 (profile 141).

The width (thickness) of the web 161b of the rail 161 is smaller than the width of the narrow portion 14a of the groove member 14 (that is, the opening width of the guide groove D1), and the cross-sectional area of the head 161c is the groove. Since it is smaller than the cross-sectional area of the wide part 14b of the member 14, the rail 161 enters the inside of the groove member 14 with the clearance which can move up and down and right and left. That is, the rail 161 serving as the protrusion P1 is coupled with the groove member 14 serving as the guide groove D1 in a loosely fitted state.
The head 161c of the rail 161 is formed to have a width that is larger than the width of the narrow portion 14a of the groove member 14 (that is, the opening width of the guide groove D1). In this way, the rail 161 is prevented from coming out of the groove member 14, so that the adjacent propelling boxes 10, 10 can be prevented from being separated more than necessary.

The recess 161d (recess P11) is formed in a shape that allows the injection tube 18 to be inserted. By injecting the water-stopping agent 18a from the injection tube 18, a gap between the protrusion P1 and the guide groove D1 is formed. The joint J1 is stopped by closing. Alternatively, the joint hole J1 is similarly water-stopped by providing the injection hole 19 from the inside of the outer shell 11 toward the guide groove D1 and injecting the water-stopping agent 18a from the injection hole 19. In the present embodiment, as shown in FIG. 2, the water-stopping agent 18 a is filled in the guide groove D <b> 1 and the gap Sa between the projecting portions S and S. Adjacent tunnels T are in close contact with each other via a water blocking material 18a.

As shown in FIG. 3, the groove member 15 constituting the guide groove D2 is disposed along the gap 11a on the inner peripheral surface of the outer shell 11 of one tunnel T (T1). Further, as shown in FIG. 4, the guide groove D2 is formed in a T-shaped groove (so-called T-groove) having a narrow portion 15a and a wide portion 15b.
That is, the guide groove D2 includes a pair of facing pieces 151 and 151 that are opposed to each other with the gap 11a of the outer shell 11 interposed therebetween, and an overhanging piece 152 that protrudes laterally from the respective distal end portions of the pair of facing pieces 151 and 151. , 152 and a section 153 having a U-shaped cross section (groove shape) provided on the projecting pieces 152, 152, and a narrow portion 15a sandwiched between the opposing pieces 151 and the projecting parts And a wide portion 15 b surrounded by the pieces 152 and 152 and the shape member 153.

  Note that the opposing piece 151, the overhanging piece 152, and the shape member 153 are made of steel and are joined to each other by welding.

  As shown in FIG. 3, the projecting member 17 constituting the projecting ridge P2 is disposed along the tunnel axis direction on the outer peripheral surface of the outer shell 11 of the other tunnel T (T2), and its projecting end portion is the outer shell 11. Protrudes outside. As shown in FIG. 4, the protruding member 17 includes a rail 171 disposed on the outer peripheral surface of the outer shell 11, a presser plate 172 disposed on the inner peripheral surface of the outer shell 11, and a flange 171 a of the rail 171. Are provided with bolts 173, 173,... Penetrating the presser plate 172, and nuts 174, 174,.

  The rail 171 is made of hot stamped steel, and includes a flange 171a fixed to the outer peripheral surface of the outer shell 11, a web 171b rising from the flange 171a, and a head 171c formed at a protruding end portion of the web 171b. ing. Further, the width (thickness) of the web 171b of the rail 171 is smaller than the width of the narrow portion 15a of the groove member 15 (that is, the opening width of the guide groove D2), and the cross-sectional area of the head 171c is small. Since it is smaller than the cross-sectional area of the wide portion 15b of the groove member 15, the rail 171 enters the groove member 15 with a clearance that can move up and down and left and right. That is, the rail 171 serving as the protrusion P2 is coupled with the groove member 15 serving as the guide groove D2 in a loosely fitted state. Further, the head 171c of the rail 171 is formed to have a width that is larger than the width of the narrow portion 15a of the groove member 15 (that is, the opening width of the guide groove D2). In this way, the rail 171 is prevented from coming out of the groove member 15, so that the adjacent propelling boxes 10 and 10 can be prevented from being separated more than necessary.

  The face plate 20 is a steel plate in which a plurality of bolt holes are formed, and is disposed across the linings L, L of the adjacent tunnels T, T. The eye plate 20 is connected to the linings L, L via bolts 21, 21,. The number of bolt holes formed in the eyeplate 20 is not limited and can be set as appropriate. Further, the shape and size of the eyeplate 20 are not limited and can be set as appropriate. Further, the eye plate 20 may be disposed for each propulsion box 10 disposed in the tunnel axis direction, or may be disposed every other plural propulsion boxes 10, 10,.

  Next, the outline | summary of the construction method of the underground structure 1 is demonstrated with reference to Fig.5 (a)-(d). In the following description, the plurality of tunnels T, T,... May be referred to as tunnels T1 to T6 in the construction order.

  In order to build the underground structure 1, first, as shown in FIG. 5 (a), the first tunnel T1 is constructed at the center of the lower part in the cross section, and next to the first tunnel T1. A second tunnel T2 and a third tunnel T3 are constructed.

  At this time, the construction of the tunnel T2 (T3) to be followed is performed by inserting the protrusion P1 of the protrusion and the protrusion P2 formed on the side surface on the tunnel T1 side into the guide grooves D1 and D2, respectively. , Without separating from the tunnel T1.

Subsequently, as shown in FIG. 5B, a fourth tunnel T4 is constructed next to the first tunnel T1 in the vertical direction (above), and the fifth tunnel is positioned adjacent to the tunnel T2 and the tunnel T4. T5 is constructed, and a sixth tunnel T6 is constructed at a position adjacent to the tunnel T3 and the tunnel T4. The construction order of the tunnels T1 to T6 is not limited to that shown in the figure (the above order), and may be changed as appropriate. Further, in the present embodiment, when the subsequent tunnel T is constructed, the adjacent tunnels T are connected to each other via the joint portions J1 and J2.

When the construction of the adjacent tunnels T, T is completed, the injection pipe 18 is inserted into the space formed between the recess P11 of the joint portion J1 and the guide groove D1, and then the water-stopping agent 18a is inserted through the injection pipe 18. Is injected to stop the joint J1 (see FIG. 2). Here, the injection pipe 18 is inserted into the joint portion J1 while washing water is sprayed from the tip of the injection pipe 18 to wash dirt and the like clogged inside the joint portion J1. When the injection pipe 18 reaches the tip of the tunnel T1, the joint portion J1 is water-stopped by gradually pulling out while injecting the water-stopping agent 18a. As a method not using the injection tube 18, the water stop agent 18 a may be injected from the injection hole 19.

  The succeeding tunnel T is constructed by sequentially extruding a plurality of propelling boxes 10, 10,... Along the preceding tunnel T next to the tunnel T constructed in advance, from a wellhead not shown. . During construction of the tunnel T, a lubricant is poured and filled around the propelling box 10, and after the construction of the tunnel T is completed, it is replaced with a curable backing material. Although not shown in the drawings, in each tunnel T, the propelling boxes 10 and 10 adjacent to each other in the tunnel axis direction are connected using bolts, nuts, and the like.

  Further, the excavating machine K shown in FIG. 5A is one that excavates itself by taking a reaction force on the propulsion box 10 (see FIG. 2) behind it (that is, equipped with a propulsion jack not shown). ) Or may be excavated by the thrust of a not-shown main pushing jack transmitted from the wellhead side through the propelling box 10. Further, as the cutter head of the excavator K, for example, a cutter head having two rocking cutters K1, K1 having a substantially rhombus shape can be adopted. The swing cutters K1 and K1 are controlled in directions opposite to each other so as to swing about the swing shaft and do not interfere with each other. Thereby, the excavation cross section can be made rectangular. The shape of the cutter head is not limited to the one shown in the figure, and may be changed according to the shape of the excavation cross section, soil quality, and the like.

  When the construction of the tunnels T1 to T6 is completed, the unnecessary linings L2, L2,... Of the tunnels T1 to T6 are removed according to the cross-sectional shape of the underground structure 1 as shown in FIG. Create a space. At this time, the linings L1 and L1 left in the adjacent tunnels T and T are connected by fixing the eye plate 20 across the linings L1 and L1, and the tunnels T1 to T6 are integrated.

  And as shown in FIG.5 (d), it uses this lining L1, L1, ... of tunnel T1-T6 left along the boundary (namely, outer edge of underground structure 1) with a natural ground. When the top plate 1A, the bottom plate 1B, and the side walls 1C and 1C are formed, an underground structure 1 is obtained. The top plate 1A, the bottom plate 1B, and the side walls 1C and 1C may be formed after removing all unnecessary lining L2, or while removing some of the unnecessary lining L2 of the tunnels T1 to T6, The top plate 1A, the bottom plate 1B, and the side walls 1C and 1C of the structure 1 may be constructed. Alternatively, the top plate 1A, the bottom plate 1B, and the side walls 1C and 1C may be removed after the completion of the construction.

  As described above, according to the underground structure 1 of the present embodiment, the joint portion J1 is not the main body portion (the L-shaped or linear portion) of the lining L1 to be left, but the protruding portion S protruding to the natural ground side. Since it is arranged, a cross-sectional defect does not occur in the main body of the lining L1. Therefore, it is not necessary to form a protruding portion on the inner space side of the underground structure 1 when connecting the tunnels or constructing the top plate 1A, the bottom plate 1B, and the side walls 1C, 1C of the underground structure 1. That is, the tunnels can be connected to each other via the eye plate 20 in the main body portion of the lining L1. Moreover, since a cross-sectional defect | deletion does not arise in the main-body part of the lining L1, it becomes possible to ensure a required cross-sectional area only by the lining L1 facing a natural ground.

Therefore, it is possible to ensure a large inner space cross-sectional area of the underground structure 1.
In other words, in order to construct the underground structure 1 having the same internal cross-sectional area, it is possible to construct it by combining the tunnel T having a smaller cross-sectional area than the conventional one. Early construction is possible.

  Further, since the protrusion P1 is formed with a portion bent in an L shape, the tip of the protrusion P1 is located in the vicinity of the outer shell of the tunnel T, and the injection hole 19 can be provided. Therefore, the operation of injecting the water blocking material 18a can be easily performed from the tunnel T. The injection hole 19 may be provided for each propelling box 10 or may be separated from the interval.

  Moreover, since adjacent tunnels T are performed in a state in which the boxes 10 are connected to each other through the joint portions J1 and J2, the preceding tunnel T1 is meandering or twisted, or the succeeding tunnel T1. Even if rolling or pitching occurs in the excavator K (see Fig. 5 (a)), these effects will be absorbed by the connecting part of both tunnels T1, T1, so It is possible to perform reliably.

  That is, as shown in FIG. 3, when pushing the propulsion box 10 (hereinafter referred to as “following propulsion box 10”) to be the succeeding tunnel T2 along the preceding tunnel T1, The rail 161 of the propulsion box 10 is inserted into the groove member 14 of the propulsion box 10 constituting the preceding tunnel T1 from the tunnel axis direction. As shown in FIG. 2, the rail 161 is a groove member. 14 so that the groove member 14 and the rail 161 can be connected to each other even if the preceding tunnel T1 is meandering or the rolling machine K of the succeeding tunnel T1 is rolling. Since there is a clearance between them, there is no inconvenience that the subsequent propelling box 10 competes immediately even if it is tilted with respect to the tunnel axis. Smoothly It is possible to begin to.

  In addition, as shown in FIG. 2, the groove member 14 and the rail 161 are coupled in a loosely fitted state so as to be able to cope with the meandering of the tunnel T1, while the head 161c of the rail 161 (ie, Since the protruding end portion of the protrusion P1 is formed to have a width that is larger than the width of the narrow portion 14a of the groove member 14 (opening width of the guide groove D1), the adjacent propelling boxes 10 and 10 are more than necessary. As a result, it is possible to construct the underground structure 1 with high dimensional accuracy.

  In addition, the joint water stop of the adjacent tunnels T1 and T1 is stopped by loosely fitting the ridge P1 into the guide groove D1 and through the recess P11 formed at the tip of the ridge P1 inside the guide groove D1. Since it is carried out by injecting the liquid medicine 18a, it is not necessary to construct a separate water stop structure, and an underground structure excellent in water stop is easily constructed.

As mentioned above, although preferred embodiment was described about this invention, this invention is not limited to the said embodiment, A design change is possible suitably in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, the case where the propelling box is made of a steel member is exemplified, but in addition, it may be made of a member made of spheroidal graphite cast iron, It may be composed of a member made of reinforced concrete. Moreover, a synthetic structure may be sufficient.

Moreover, although it was set as the structure which attaches a protrusion to the side of a propulsion box through a volt | bolt and a nut, for example, the flange part of a rail may be welded and attached to the side of a propulsion box, and the attachment method of a protrusion is as follows. It is not limited.
Moreover, in the said embodiment, although the protrusion was formed with the rail which consists of hot stamped steel, it may form, for example combining a steel plate, and the formation method of a protrusion is not limited. Similarly, in the embodiment, the guide groove is formed by combining the shape steels, but it goes without saying that the method of forming the guide groove is not limited.

Further, in the embodiment, the injection of waterproofing agent into the joint portion, it is configured to perform through the injection tube and the injection hole, waterproofing method of joint is not intended to be limited, for example, joint After washing, a water-stopping agent may be directly filled into the space formed between the concave portion of the ridge and the guide groove.

In addition, the protrusions arranged in the protrusions do not necessarily have to be formed with a portion bent in an L shape, and the cross-sectional shape thereof is not limited.
Moreover, what is necessary is just to form the recessed part of the front-end | tip of a protrusion as needed, and you may abbreviate | omit.

Moreover, the structure of a coupling part is not limited and can be set suitably.
Moreover, the connection method of adjacent tunnels is not limited to the method using a face plate, and may be performed by a known method as appropriate. For example, members such as eye plates may be omitted if adjacent tunnels can be joined by frictional forces.

It is sectional drawing which shows the underground structure which concerns on suitable embodiment of this invention. It is an expanded sectional view of the X section of FIG. It is a perspective view which shows the propulsion box which comprises the underground structure shown in FIG. It is an expanded sectional view of the Y part of FIG. (A)-(d) is sectional drawing which shows the construction procedure of the underground structure based on this invention. (A) is sectional drawing which shows the conventional underground structure, (b) is an expanded sectional view which shows Z part of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Underground structure 10 Propulsion box 11 Outer shell 12 Main girder 13 Longitudinal rib 14 Groove member 15 Projection member 18 Pipe material 18a Water stop agent 20 Face plate T (T1-T6) Tunnel L Covering D1 Guide groove P1 Projection P11 Recess

Claims (4)

The top plate, bottom plate and side wall are formed by the lining facing the ground of a plurality of tunnels arranged side by side, and the lining facing the other adjacent tunnel is removed from the linings of each tunnel. An underground structure in which a space is formed,
Protruding portions that protrude from the top plate, the bottom plate, or the side wall to the natural ground side are provided in each of the linings facing the natural ground of the two adjacent tunnels, and this protruding portion covers the natural ground. Form a joint that connects the works ,
Before SL joint portion has a guide groove which is open is formed by one of disposed inside a groove member of the protruding portion of the tunnel of the two said tunnel adjacent to the other tunnel end,
A ridge formed by a protruding member fixed to the outer peripheral surface of the protruding portion of the other tunnel and inserted into the guide groove;
It characterized the Turkey and a water stop agent is injected around the protrusion, underground construction. The ribs are formed with a portion that is bent in an L-shape, characterized in that the tip of the protrusion is disposed in the vicinity of the outer surface of the lining underground according to claim 1 Structure. The underground structure according to claim 1 or 2 , wherein a concave portion having a shape capable of pipe piping is formed at a tip of the protrusion. The underground structure according to any one of claims 1 to 3 , wherein the two adjacent tunnels are connected by a grid plate disposed across the lining of both tunnels. object.

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