JP2007056544A - Propulsive box body, construction method of tunnel and construction method of the tunnel with large cross section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propulsive box body capable of simply constructing a tunnel including a curved line shape at a low cost, a construction method of a tunnel having the curved line shape making use of the propulsive box body and a construction method for the tunnel with a large cross section having the curved line shape making use of a plurality of tunnels arranged by the construction method of the tunnel. <P>SOLUTION: The propulsive box body 10 equipped with body sections 11 as cylindrical members each formed in a shape of a trapezoid having a length L2 on the inner side to the curvi-lineal of the curvi-linear section shorter than a length L1 on the outer side in a plan view and a fixed jig 13 placed at the cutting face side of the body section 11 in a linear section and maintaining the width L3 of a triangular space (notch 12) in a plan view between the adjoining other box bodies is continuously placed in the ground by a pipe jacking method. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a propulsion box used for construction of a tunnel having a curved section and a straight section, a tunnel construction method using the propulsion box, and a large-section tunnel construction method.

As a method of constructing a large-section tunnel, for example, as shown in Patent Document 1, there are cases where a plurality of small-section tunnels arranged side by side are used. In this large cross-section tunnel construction method, multiple small cross-section tunnels were placed side by side, and then each small cross-section tunnel was left while forming a large space by removing unnecessary lining of each small cross-section tunnel. A large section tunnel is constructed by forming an outer shell using lining.
Construction of each small section tunnel is carried out so as to contact each adjacent small section tunnel by the propulsion method, and the box of the tunnel constructed in advance (hereinafter sometimes simply referred to as “preceding tunnel”) The guide groove formed on the side surface is dug while fitting the protrusions formed on the side surface of the box of the tunnel to be constructed following (hereinafter sometimes referred to simply as the “backward tunnel”). It is.

  With regard to such a small-section tunnel, conventionally, when constructing a route that combines a straight line and a curved line, a bending angle is set within the range of looseness of this socket by using a socket at the junction between the boxes. I was adjusting. However, if a small cross-section tunnel is constructed through a socket, it becomes impossible to install a guide groove, and it may be difficult to ensure the construction accuracy of the large cross-section tunnel.

  For this reason, in Patent Document 2, after assembling the segment formed according to the predetermined alignment by the shield method and excavating the preceding tunnel, the propulsion method is used to create a guide groove constructed on the side surface of the segment of the preceding tunnel. A method of constructing a large-section tunnel by digging while fitting the protrusions of the propulsion box of the subsequent tunnel is disclosed.

Here, the propulsion method is a method of constructing a tunnel by sequentially injecting a cylindrical box as a tunnel lining from the wellhead into the ground. An excavator or the like is attached to the tip of the box from the blade edge. The propulsion method excavator may be one that propels itself by reacting to the box (that is, one that is equipped with a propulsion jack), or is dug by the thrust of the main jack transmitted through the box. You may do. 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.
JP 2001-214699 A ([0022], FIG. 1) Japanese Patent Laying-Open No. 2004-250957 ([0014]-[0017], FIG. 4)

  However, the construction of tunnels by the shield method is generally expensive and has a problem that the construction period is longer than that of the propulsion method. In addition, it takes time to change to the propulsion method after construction of the shield method, and in construction in the city center etc., it is not possible to secure a space for arranging the equipment used for the shield method and the propulsion method. There was a case.

  The present invention has been made to solve the above-mentioned problems, and a propulsion box capable of easily and inexpensively constructing a tunnel including a curve line shape, and a curve line shape using the propulsion box. It is an object of the present invention to propose a method for constructing a tunnel having a curved line and a method for constructing a large-section tunnel having a curved line shape by using a plurality of tunnels arranged in parallel by the tunnel construction method.

  In order to solve the above-mentioned problem, the propulsion box of the present invention is a propulsion box used when a tunnel having a curved section and a straight section is constructed by a propulsion method. In the curved section, the main body part which is a cylindrical member formed in a trapezoidal shape whose inner side is shorter than the outer side, and in the linear section, at least either the front end or the rear end of the main body part A fixing jig that is disposed and forms a triangular space in plan view with another adjacent propulsion box.

  According to such a propulsion box, the curved section can be constructed with a curved line shape corresponding to the curved section by connecting the main body portions formed in a trapezoidal shape that is continuous in the front-rear direction. Also, in the straight section, the propulsion box is arranged in a straight line by forming a triangular space between the front and rear propulsion boxes via a fixing jig. It becomes possible to do. Therefore, a tunnel having a curved section and a straight section can be constructed only by a relatively inexpensive and simple propulsion method, which is preferable.

  Further, if the propulsion box includes a protective plate that is disposed on the outer periphery of the main body portion and extends so as to cover the triangular space in the plan view formed in the straight section, a fixing jig is provided. When propelling a curved section through, it is suitable for preventing earth and sand from entering the tunnel from the space by the protection plate.

  Further, if the propulsion box includes a hinge shaft outside the curved line at either the front end or the rear end of the main body, the front and rear propelling boxes at the switching section between the straight section and the curved section The adjustment of the angle between each other can be easily performed via the hinge shaft, which is preferable.

  In the tunnel construction method of the present invention, a propulsion box having a trapezoidal main body portion in plan view and having a fixing jig disposed at least at either the front end or the rear end of the main body portion is continuously in the ground. A tunnel construction method having a curved section and a straight section by disposing the first and second sections, the curved section is promoted by connecting the main body portions, and the side surface of the main body portion is parallel to the alignment of the tunnel. In this manner, the fixing jig is used to form a triangular space in plan view between the front and rear main body portions, and the straight section is promoted.

  Such a tunnel construction method is preferable because the tunnel having a curved section and a straight section can be easily constructed by the propulsion method.

  Further, in the tunnel construction method, the propulsion box includes a protection plate that protrudes from the main body so as to cover a triangular space in the plan view, and in the straight section, in the plan view. If the triangular space is closed by the protective plate and propelled in the curved section with the main body part adjacent to the protective plate inserted, the protective plate is spaced between the front and rear propelling boxes in the straight section. Intrusion of earth and sand is prevented, and the continuous arrangement of the main body in the curved section is not disturbed.

  Further, in the tunnel construction method, the propulsion box includes a hinge shaft on the outer side with respect to the curved line shape of either the front end or the rear end of the main body, and the curved section and the straight section. If the angle between the front and rear propelling boxes is changed with the hinge axis as the axis, the curve section can be smoothly entered.

  Furthermore, the construction method for a large section tunnel of the present invention is characterized in that a large section tunnel is constructed by connecting a plurality of tunnels in parallel by the tunnel construction method.

  According to the construction method of such a large section tunnel, a plurality of tunnels are constructed with high precision for a large section tunnel having a curved section and a straight section, so that the tunnels arranged in parallel are easily connected. This makes it possible to perform construction easily and reliably.

  According to the propulsion box of the present invention, a tunnel including a curved section can be constructed easily and inexpensively. And, by the tunnel construction method using this propelling box, it becomes possible to easily construct a tunnel having a curved section and a straight section, and if a plurality of tunnels and a tunnel are juxtaposed by this tunnel construction method, It is possible to easily construct a large section tunnel having a curved section and a straight section.

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.
1A and 1B are diagrams showing a large-section tunnel according to the present embodiment, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view. FIG. 2 is a perspective view showing the propulsion box according to the present embodiment. FIGS. 3A and 3B are diagrams showing the fixing jig, in which FIG. 3A shows a usage state in a straight section, and FIG. 3B shows a usage situation in a curved section. Moreover, FIG. 4 is a figure which shows the modification of a fixing jig. FIG. 5 is a diagram showing the usage of the propulsion box, in which (a) is a plan view in a straight section, (b) is a plan view in a curved section, and (c) is an X portion of (b). FIG. Furthermore, (a)-(d) of FIG. 6 is a top view which shows the construction procedure of the large cross-section tunnel which concerns on this embodiment.

  In the present embodiment, as shown in FIG. 1A, a case where a large-section tunnel 1 having a curved section A and a straight section B is constructed will be described. As shown in FIG. 1B, the large-section tunnel 1 is constructed by connecting a plurality of (in this embodiment, six) tunnels T, T,.

Each tunnel T is formed by continuously arranging a plurality of propelling boxes in the ground by a propulsion method.
In this embodiment, as a propelling box, a curved box (promoting box in the claims) 10 formed corresponding to the curve alignment of the curve section A and a straight line formed corresponding to the alignment of the straight section B. The box 20 is used. Hereinafter, when the “curve box 10” and the “straight box 20” are not distinguished, they may be simply referred to as “boxes 10 and 20”.

The large-section tunnel 1 according to the present embodiment is formed by connecting six tunnels T, T,... That is, after forming each tunnel T by excavating the natural ground with the excavator M (see FIG. 6) and arranging the boxes 10 and 20 behind the excavator M, unnecessary portions of the boxes 10 and 20 are formed. A large space (large cross-section tunnel 1) is formed by removing.
In the present embodiment, the large-section tunnel 1 is formed using the six tunnels T, T,..., But the number and arrangement of the tunnels T are not limited and are appropriately It may be set according to the above situation, the shape of the large section tunnel 1, the shape of the tunnel T, and the like. Moreover, the excavation machine M is used as needed, and does not need to be used as long as the tunnel T can be constructed without requiring the excavation machine M. Further, it goes without saying that the form and shape of the excavator M are not limited.

As shown in FIG. 2, the curved box 10 according to the present embodiment is a cylindrical member formed in a trapezoidal shape whose inner side is shorter than the outer side with respect to the curve of the curved section A in plan view. The main body part 11 and the front main body part 11 are arranged in the straight section B at the front end (face side) of the main body part 11 so that the side surface of the main body part 11 is parallel to the alignment of the tunnel T. And a fixing jig 13 that forms a triangular space (see FIG. 5A) in plan view. That is, the tip of the main body 11 is tapered so that the inner side L2 is shorter than the outer side L1 (see FIG. 5A) in accordance with the alignment of the curved section A. It has a portion 12.
In the present embodiment, the cutout portion 12 is formed on the end surface in the traveling direction of the tunnel of the curved box 10, that is, the end surface on the face, but the cutout portion 12 is formed on the face of the curved box 10. It is not limited to the side, and may be formed on the wellhead side or on both the face side and the wellhead side.

  The main body 11 includes an outer shell 14 formed in a rectangular tube shape, a plurality of main girders 15, 15,... Arranged in parallel in the axial direction of the tunnel T, and adjacent main girders 15, Are provided with a plurality of vertical ribs 16, 16,... Arranged along the axial direction of the tunnel T.

  The main girder 15 is formed by combining steel materials in a rectangular shape, and has a sufficient strength against external forces (earth pressure, groundwater pressure, etc.) acting on the tunnel T in a state where it is placed in the ground. ing. In the present embodiment, four main girders 15, 15,... Are arranged for one curved box 10. Of these main girders 15, the foremost main girder 15 a forms a notch portion 12, that is, the inner side of the curve T of the tunnel T is located behind the outer side, It is installed diagonally.

  The steel material forming the main beam 15 is not limited, and any known steel material such as an H-shaped steel, an L-shaped steel, a grooved steel, and a steel pipe can be used, but in this embodiment, A steel plate shall be used. Further, in the present embodiment, the rectangular main girder 15 is formed by combining steel materials. However, for example, it may be configured by cutting out an inner portion of a rectangular steel plate, and the forming method is limited. It is not something. In the present embodiment, four main girders 15, 15,... Are installed for one curved box 10. However, it goes without saying that the quantity of the main girds 15 is not limited.

  Of the four main girders 15, 15,..., The foremost main girder 15a and the last main girder 15b have insertion holes 15h on the inner side for installing the fixing jig 13 to be described later. A plurality of locations (three locations in this embodiment) are formed at intervals of. The shape and quantity of the insertion hole 15h are determined according to the shape and strength of the fixing jig 13, and may be set as appropriate. Needless to say, depending on the type of the fixing jig 13, the insertion hole 15h is not formed.

The vertical ribs 16 are arranged between the adjacent main girders 15 and 15 so as to maintain the interval between the main girders 15 and to exhibit sufficient proof strength against the axial force acting during propulsion. ing.
In the present embodiment, the same type of steel plate as the main girder 15 is used as the vertical ribs 16, but the material constituting the vertical ribs 16 is not limited, and H-shaped steel, L-shaped steel, All known steel materials such as channel steel and steel pipe can be used. Needless to say, the quantity of the vertical ribs 16 is not limited.

  The outer shell 14 is formed by welding a plurality of skin plates formed so as to cover the plurality of main girders 15, 15,... And has a rectangular cross section as a whole. That is, it is formed by combining upper and lower skin plates formed in the same trapezoidal shape, a wide curved line outer skin plate, and a narrow curved line inner skin plate.

The notch portion 12 is formed on the front side of the main body portion 11 and is a triangular prism-shaped space formed by obliquely installing the foremost main girder 15a.
And this notch part 12 is arrange | positioned on the outer periphery of the main-body part 11, and the circumference | surroundings are covered by the protection plate 17 which protrudes to the front side of the main-body part 11. FIG.

As shown in FIG. 2, the protection plate 17 is arranged around the face side of the main body part 11 and projects to the face side of the main body part 11 so as to cover the top, bottom, left and right of the notch portion 12.
The protective plate 17 is formed in a rectangular tube shape by horizontal steel plates 17 a and 17 a arranged on the top and bottom, and vertical steel plates 17 b and 17 c arranged on the inside and outside of the tunnel T, respectively. By being installed so as to project from the face side, the curved box 10 is configured to have a rectangular shape in plan view.

  The vertical steel plate 17c arranged outside the tunnel T and the horizontal steel plates 17a, 17a arranged above and below are integrally joined by welding to form a U-shaped cross section, and then Installed on the outer periphery. On the other hand, the vertical steel plate 17b disposed inside the tunnel T is directly fixed to the inner side surface of the main body 11 without being fixed to the upper and lower horizontal steel plates 17a and 17a. In the present embodiment, a stretchable water stop material (for the purpose of preventing infiltration of groundwater or earth and sand from the contact portion between the upper and lower horizontal steel plates 17a, 17a and the inner vertical steel plate 17b) (Not shown).

A groove is formed in the longitudinal direction on the outer face side surface of the foremost main girder 15a, and the hinge shaft 18 is disposed in this groove.
The hinge shaft 18 is formed of a steel rod having a circular cross section, and is formed so as to protrude from the surface of the main beam 15a in a state of being disposed in the groove of the main beam 15a. The material constituting the hinge shaft 18 is not limited to a steel rod, and any known material such as a steel pipe should be used as long as it has a strength that does not deform due to the axial force during propulsion. Is possible. Further, the arrangement method of the hinge shaft is not limited. For example, the hinge shaft may be appropriately fixed by a known means such as direct welding without forming a groove. Moreover, you may comprise the hinge axis | shaft 18 by forming a protrusion directly in the main girder 15a.

  As shown in FIG. 1 and FIGS. 3 (a) and 3 (b), the fixing jig 13 is composed of main beams 15 and 15 of the curved boxes 10 and 10 adjacent to the front and rear (the main part of the rearmost portion of the curved box 10 on the front side). The girder 15b is connected to the front main girder 15a) of the rear curved box 10, and a plurality of girder 15b are arranged on the inner sides of the main girder 15b, 15a vertically at a predetermined interval. That is, the fixing jig 13 is disposed so as to straddle the main beam 15b and the main beam 15a by inserting the insertion holes 15h formed in advance in the main beams 15b and 15a of the curved boxes 10 and 10 adjacent to each other in the front and rear directions. ing. In the present embodiment, the fixing jig 13 is arranged on the inner side of the curved box 10, but the number, position, etc. of the fixing jig 13 are not limited, and for example, the upper and lower sides in addition to the inner side You may arrange in.

  As shown in FIGS. 3A and 3B, the fixing jig 13 according to the present embodiment includes a screw rod 13a that passes through the main girders 15b and 15a, and four nuts 13b that are screwed into the screw rod 13a. , 13b,... And the nut 13b is arrange | positioned at the face side and the wellhead side of the main girder 15, respectively so that the main girder 15 of the front and back may be hold | gripped by two each.

  In the present embodiment, the fixing jig 13 is composed of a screw rod 13a and nuts 13b, 13b,..., But the fixing jig 13 has a width of the notch portion 12 of the curved box 10 in the straight section B. A box having a proof strength capable of maintaining (a triangular space formed between the front and rear curved boxes 10), and arranged in front of the curved section A without the width of the notch portion 12. The configuration, shape, and the like are not limited as long as they can contact the bodies 10 and 20. That is, for example, as shown in FIG. 4, a fixing jig 13 'composed of a steel plate 13c and a bolt 13d may be used. According to the fixing jig 13 ′, when propelling in the straight section B, the notched portion is formed by fixing the steel plate 13c to the longitudinal ribs 16 and 16 of the front and rear curved boxes 10 and 10 via the bolts 13d and 13d. In the curve section A, the fixed jig 13 ′ is removed, and the curved box 10 can be arranged according to the curve line shape.

The linear box 20 according to the present embodiment is formed in a rectangular shape in a plan view, and a plurality of the outer shell formed in a rectangular tube shape and a plurality of parallelly arranged at predetermined intervals in the axial direction of the tunnel T. And a plurality of vertical ribs arranged along the axial direction of the tunnel T between adjacent main girders.
In addition, what is necessary is just to select and use a well-known propelling box as the linear box 20, and detailed description is abbreviate | omitted.

  Further, both or one of the guide groove J1 and the projecting member J2 is attached to the boxes 10 and 20 in the vicinity of the corner portion of the outer shell 14. The positions and the number of the guide grooves J1 and the projecting members J2 are appropriately set according to the arrangement of the tunnel T.

  The guide groove J1 is formed in the outer shell 14 along the tunnel axis direction. By combining groove steel or steel plate, the guide groove J1 is a groove having a narrow section and a wide section (so-called T groove). ).

  The projecting member J <b> 2 is disposed at a position corresponding to the guide groove J <b> 1 of the adjacent boxes 10, 20 on the outer peripheral surface of the outer shell 14, and projects to the outside of the outer shell 14. The projecting member J2 is configured by welding the rail to the outer peripheral surface of the outer shell 14.

  The rail (projecting member J2) is made of hot stamped steel, and includes a flange fixed to the outer peripheral surface of the outer shell 14, a web rising from the flange, and a head formed at the projecting end portion of the web. Yes. Since the width (thickness) of the rail web is smaller than the width of the narrow portion of the guide groove J1, and the cross-sectional area of the head is smaller than the cross-sectional area of the wide portion of the guide groove J1. The rail enters the inside of the guide groove J1 with a clearance that can move vertically and horizontally. That is, the protruding member J2 is coupled to the guide groove J1 in a loosely fitted state. Further, the head portion of the rail is formed in a width dimension larger than the width of the narrow portion of the guide groove J1. In this way, the rails are prevented from coming out of the guide groove J1, so that the adjacent boxes 10 and 20 can be prevented from being separated more than necessary. Hereinafter, the joint composed of the guide groove J1 and the protruding member J2 may be referred to as a “joint portion J”.

  Next, the construction method of the large-section tunnel 1 according to the present embodiment will be described with reference to the drawings.

  As shown in FIG. 6, each tunnel T, T,... Has an excavator M that cuts natural ground, and a source that pushes the boxes 10 and 20 into excavation holes cut by the excavator M from behind the excavator M. It is constructed with a push jack (not shown).

Here, the type or the like of the excavator M is not limited, and may be appropriately selected from known excavators according to the conditions of the natural ground, the cross-sectional shape of the tunnel T, and the like.
The main pushing jack is a device for press-fitting the boxes 10 and 20 from the tunnel T tunnel, and is installed so that the jack thrust is evenly transmitted to the rear end surfaces of the boxes 10 and 20.

  In the construction of the tunnel T according to the present embodiment, in the straight section B, as shown in FIG. 5A, the curved box 10 is continuously formed in a state where the width L3 of the notch portion 12 is maintained by the fixing jig 13. To promote. That is, by adding the width L3 of the notch portion 12 secured by the fixing jig 13 to the length L2 of the inner side of the main body 11, the same length (L2 + L3) as the length L1 of the outer side is secured. The curved box 10 is arranged so that the side surfaces of the continuous curved box 10 (main body part 11) form a straight line. On the other hand, in the curve section A, as shown in FIG. 5 (b), the fixing jig 13 is removed, or the interval between the main girders 15, 15 is narrowed by the nut 13b of the fixing jig 13 (FIG. 3 (b)). Reference), the curved box 10 is arranged so as to draw a curve corresponding to the curve line shape.

At this time, as shown in FIGS. 5 (a) and 5 (b), the protective plate 17 of the curved box 10 is the rear part (the wellhead side end) of the main body 11 of the curved box 10 (straight box 20) adjacent immediately before. Part) is inserted.
In addition, since the inner vertical steel plate 17b is divided | segmented into the upper and lower horizontal steel plates 17a and 17a, as shown in FIG.5 (b), the protection plate 17 has a curved box 10 on the face side in an angled state. It is possible to interpolate the rear part. That is, as shown in FIG. 5 (c), even when the curved box 10 is arranged at an angle at which the inner surface of the main body 11 on the face side protrudes inward from the protective plate 17, the inner side of the main body 11 on the face side Since the vertical steel plate 17b is spread by the side surfaces, the protective plate 17 does not hinder the connection of the main body portions 11 and 11.
In addition, since a stretchable water stop material (not shown) is installed at the corners of the upper and lower horizontal steel plates 17a, 17a and the inner vertical steel plate 17b, the vertical steel plate 17b Even in the expanded state, the penetration of earth and sand and groundwater into the tunnel T is prevented.

  Further, when the tunnel T is constructed, when switching from the straight section B to the curved section A, the width of the notched portions 12 of the front and rear curved boxes 10 and 10 is adjusted with the hinge shaft 18 as an axis.

  As shown in FIGS. 6 (a) to 6 (d), a plurality of tunnels T, T,... Are connected to tunnels T2, T3, T4, T5, T6 ( (See FIG. 1B). Needless to say, the construction order of the plurality of tunnels T, T,... Is not limited to the above order.

  In contrast to a plan in which six tunnels are arranged two by three, first, as shown in FIG. 6A, the tunnel T1 on the lower inner side (lower right side in the drawing) is constructed.

The alignment of the tunnel in the present embodiment has a curved section A after passing through the straight section B.
Therefore, in the construction of the tunnel T, after the number of curved boxes 10 corresponding to the curved section A are press-fitted, the straight boxes 20 are continuously press-fitted (see FIG. 6B). Here, reference numeral 30 in the figure is an adjustment box for connecting the excavator M and the curved box 10.

  The passage of the straight section B by the curved box 10 is performed in a state where the width of the notch portion 12 is maintained by the fixing jig 13 as shown in FIG.

  When the curved box 10 reaches the curved section A, as shown in FIG. 6 (b), the fixing jig 13 is removed, and the main body parts 11, 11 of the curved boxes 10, 10 continuous in the tunnel axis direction. The front end and the rear end of the are closely attached. If it does in this way, the curve box 10 will be arrange | positioned according to curve alignment.

When the construction of the inner tunnel T1 is completed or the construction of the tunnel T1 reaches a predetermined extension, construction of the center tunnel T2 is started adjacent to the tunnel T1.
At this time, the casings 10 and 20 are arranged in a state where the protruding members J2 formed on the casings 10 and 20 of the tunnel T2 are inserted into the guide grooves J1 formed on the casings 10 and 20 of the tunnel T1. . Since the construction method of the other tunnel T2 is the same as the construction method of the tunnel T1, detailed description is abbreviate | omitted.

When the construction of the center tunnel T2 is completed or the construction of the tunnel T2 reaches a predetermined extension, construction of the outer tunnel T3 is started adjacent to the tunnel T2.
At this time, the boxes 10 and 20 are arranged in a state where the protruding members J2 formed on the boxes 10 and 20 of the tunnel T3 are inserted into the guide grooves J1 formed on the boxes 10 and 20 of the tunnel T2. . Since the construction method of the other tunnel T3 is the same as the construction method of the tunnel T1, detailed description is abbreviate | omitted.

  When the construction of the lower inner tunnel T1, the lower middle tunnel T2, and the lower outer tunnel T3 is completed or completed to a predetermined extension, the upper tunnels T4, T5, and T6 are similarly constructed. At this time, the construction method, construction order, and the like of the upper tunnels T4, T5, and T6 are the same as those of the lower tunnels T1, T2, and T3 described above, and thus detailed description thereof is omitted.

  When the construction of the tunnels T1 to T6 is completed, unnecessary portions of the boxes 10 and 20 of the tunnels T1 to T6 are removed in accordance with the cross-sectional shape of the large-section tunnel 1 as shown in FIG. Create a space. At this time, the gap s formed between the tunnels T is filled with a filler for the purpose of preventing infiltration of groundwater. Moreover, you may arrange | position a water stop board in the boundary between the clearance gap s and a natural ground for the chemical | drug | medicine injection | pouring for the purpose of water stop to the surrounding natural ground corresponding to the clearance gap s as needed.

  Then, the top plate 1A, the bottom plate 1B, and the side wall 1C of the main building are utilized by using the boxes 10 and 20 of the tunnels T1 to T6 left along the boundary with the natural ground (that is, the outer edge of the large section tunnel 1). When 1C is formed, a large-section tunnel 1 is obtained. Note that the top plate 1A, the bottom plate 1B, and the side walls 1C and 1C may be formed after all unnecessary portions of the boxes 10 and 20 have been removed, while removing unnecessary portions of the tunnels T1 to T6. The top plate 1A, the bottom plate 1B, and the side walls 1C and 1C of the large-section tunnel 1 may be constructed.

  As described above, according to the propelling box of the present invention, with respect to the curve section A, by connecting the main body portion 11 that is continuous in the front and back, the cutout portion 12 formed at a predetermined angle corresponds to the curve section A. It is possible to construct a tunnel T with a curved line shape. Further, in the straight section B, the width of the notch portion 12 is maintained via the fixing jig 13, so that the propulsion can be performed while maintaining the linear alignment. Therefore, regarding the construction of the tunnel T having the curved section A and the straight section B, it is possible to carry out construction by an inexpensive and simple propulsion method.

  Further, since the curved box 10 is provided with the hinge shaft 18 outside the curved line shape of the notch portion 12, the angle between the front and rear curved boxes 10 is changed at the switching section between the straight section B and the curved section A. Adjustment can be easily performed via the hinge shaft 18. Further, when propelling the straight section B, the propulsive force from behind the curved box 10 is transmitted to the front boxes 10 and 20 via the hinge shaft 18, so that the outer corners of the front and rear boxes 10 and 20 are Prevent damage.

  According to the tunnel construction method of the present invention, it is possible to easily construct a tunnel having a curved section A and a straight section B by the propulsion method.

  Moreover, according to the tunnel construction method of the present invention, the curved box 10 is provided on the outer periphery of the main body part 11 and includes the protective plate 17 protruding from the main body part 11 so as to cover the notch part 12. Therefore, when propelling the straight section B through the fixing jig 13, the protective plate 17 closes the opening formed by the notch portion 12, and the box 10, 20 in which the protective plate 17 is adjacent in the curved section A. The curve section A is propelled with the rear part inserted. Therefore, in the straight section B, groundwater and earth and sand do not enter from the gap between the boxes 10 and 20 adjacent to each other in the front and back, and the main body 11 can be continuously arranged in the curved section A. .

  Moreover, since the inner vertical steel plate 17b is separated, the protective plate 17 is configured to be able to be expanded in accordance with the angle of the curved box 10 adjacent to the front and rear in the curved section A. The tunnel T having a desired curve line shape can be constructed without hindering the connection between the boxes 10.

  Further, since the width of the notch portion 12 can be adjusted without removing the fixing jig 13 by adjusting the width of the nut 13b of the fixing jig 13 with respect to the screw rod 13a, a straight line is provided after the curve section A. A smooth propulsion construction is also possible for the alignment having the section B.

  Furthermore, according to the construction method of the large section tunnel of the present invention, the large section tunnel 1 having the curved section A and the straight section B can be easily connected between the tunnels T arranged side by side. And perform construction reliably.

  Further, since the projecting member J2 of the succeeding tunnel T is inserted into the guide groove J1 of the adjacent tunnel T, the large-section tunnel 1 composed of a plurality of tunnels T, T,. Making it possible.

Further, if the projecting member J2 is formed so as to be loosely fitted inside the guide groove J1, when the preceding tunnel T is meandering or twisted, it rolls on the excavator M of the tunnel T that follows. Even if the occurrence of pitching or the like occurs, these effects are absorbed by the joint portion J of both tunnels T and T, so that the construction can be performed reliably.
That is, when pushing out the boxes 10 and 20 to be the tunnel T following the tunnel T along the preceding tunnel T, the projecting member J2 of the boxes 10 and 20 following is guided by the leading box 10 and 20 Although inserted into the groove J1 from the tunnel axis direction, the projecting member J2 enters the guide groove J1 in a loosely fitted state, so that even if the preceding tunnel T is meandering or the like, Even if rolling or the like occurs in the excavating machine M of the tunnel T, the inconvenience that the guide groove J1 and the projecting member J2 compete immediately does not occur. 20 can be pushed out smoothly.

  Further, as shown in FIG. 1B, the guide groove J1 and the projecting member J2 are coupled in a loosely fitted state so as to be able to cope with the meandering of the tunnel T, etc. Since the portion is formed in a width dimension larger than the width of the narrow portion of the guide groove J1, the adjacent boxes 10 and 20 are not separated more than necessary, and as a result, a large cross section with high dimensional accuracy. Tunnel 1 can be 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, the case where a large-section tunnel is constructed by connecting a plurality of tunnels in parallel and then connecting these tunnels has been described. However, the propulsion box of the present invention is also used for constructing a single tunnel. It goes without saying that it is possible.

  Moreover, although the case where a large-section tunnel is constructed has been described in the above embodiment, it goes without saying that the propelling box of the present invention is applicable to construction of any underground structure, not limited to a large-section tunnel. .

  In the above embodiment, the large-section tunnel is constructed by connecting a plurality of tunnels. However, after the outer shell of the large-section tunnel is formed by the tunnel construction method of the present invention, Needless to say, a large section tunnel may be constructed by excavating the inside.

  In the above embodiment, the linear tunnel having the curved section A after the straight section B has been described. For example, the propulsion box of the present invention can also be applied to a linear shape having the straight section B after the curved section A. Needless to say.

Moreover, although it was set as the structure attached to the side surface of a propulsion box by welding, for example, the flange part of a rail may be fastened to the side of a propulsion box via a bolt and a nut. It is not limited.
Moreover, in the said embodiment, although the protrusion member shall be formed by the rail which consists of hot stamped steel, it may form, for example combining a steel plate, and the formation method of a protrusion member 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.

In addition, if the construction of each tunnel can be performed accurately, the joint portion is not necessarily required and may be omitted.
Furthermore, it goes without saying that the configuration of the joint is not limited.

It is a figure which shows the large cross-section tunnel concerning this embodiment, Comprising: (a) is a top view, (b) is a cross-sectional view. It is a perspective view which shows the propulsion box which concerns on this embodiment. It is a figure which shows a fixing jig, Comprising: (a) has shown the use condition in a linear area, (b), respectively in the curve area. It is a figure which shows the modification of a fixing jig. It is a figure which shows the use condition of the propulsion box which concerns on this embodiment, Comprising: (a) is a top view in a straight area, (b) is a top view in a curve area, (c) shows X part of (b). It is an enlarged view. (A)-(d) is a top view which shows the construction procedure of the large cross-section tunnel which concerns on this embodiment.

Explanation of symbols

1 Large section tunnel 10 Curved box (Promotion box)
DESCRIPTION OF SYMBOLS 11 Main body part 12 Notch part 13 Fixing jig 14 Outer shell 17 Protection plate 18 Hinge shaft 20 Linear box A Curve section B Straight section T Tunnel

Claims (7)

A propulsion box used when a tunnel having a curved section and a straight section is constructed by a propulsion method,
When viewed in plan, the main body part is a cylindrical member formed in a trapezoidal shape whose inner side is shorter than the outer side in the curved section;
A fixing jig that is disposed at least at either the front end or the rear end of the main body in the straight section and forms a triangular space in plan view with another adjacent propulsion box. This is a propelling box.   2. The propulsion box according to claim 1, further comprising a protection plate disposed on an outer periphery of the main body portion and extending so as to cover a triangular space in the plan view formed in the straight section. .   The propelling box according to claim 1 or 2, wherein a hinge shaft is provided outside the curved line at either the front end or the rear end of the main body. A curved section and a straight section are provided by continuously disposing a propelling box having a trapezoidal body portion in plan view and having a fixing jig disposed at least on either the front end or the rear end of the body portion in the ground. A tunnel construction method comprising:
Promote curved sections by connecting the body parts,
Forming a triangular space in plan view between the front and rear body parts using the fixing jig so that the side surface of the body part is parallel to the alignment of the tunnel, and propelling the straight section A tunnel construction method that is characteristic. The propulsion box is provided with a protective plate protruding from the main body so as to cover a triangular space in the plan view;
In the straight section, the triangular space in the plan view is closed with the protective plate,
5. The tunnel construction method according to claim 4, wherein in the curved section, the protection plate is propelled in a state where an adjacent main body is inserted. The propulsion box has a hinge shaft on the outside of the curved line at either the front end or the rear end of the main body,
6. The tunnel construction method according to claim 4, wherein the angle between the front and rear propelling boxes is changed around the hinge axis when switching between the curved section and the straight section. .   A large section tunnel is constructed by connecting a plurality of tunnels in parallel by the tunnel construction method according to any one of claims 4 to 6, and connecting the plurality of tunnels. Construction method of cross-section tunnel.

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