JP3150661B2 - Construction method of outer lining of large section tunnel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing an outer lining of a large-section tunnel, and more particularly to a method of pre-constructing an outer lining of a large-section tunnel used for a subway, an underground expressway or the like.

[0002]

2. Description of the Related Art In recent years, with the development of underground infrastructure in urban areas and the development of high-density underground space, there is a demand for an efficient and economical construction method of underground structures that are becoming increasingly congested. . As one of the solutions, MMST (Multi-micro Shielding), which excavates the tunnel outer part in the ground to construct a lining body and then excavates the soil inside the lining body to construct a large-section tunnel Tunnel) construction method etc.
Is being developed.

In the MMST method, as schematically shown in FIG.
Multiple small rectangular cross-sections (element tunnels)
And excavated each small section with a rectangular shield machine and reinforced with segments to construct multiple element tunnels, connected and integrated each element tunnel, and completed the outer lining underground After that, the inner excavation and inner construction of the outer lining will be performed, and by dividing into small sections, the impact on neighboring structures such as the surrounding ground, the ground, and bridge foundations will be suppressed, and limited underground space will be used. There is an advantage that the maximum inner space section can be economically secured.

[0004]

SUMMARY OF THE INVENTION However, MMS
In the T method, since it is difficult to continuously arrange small rectangular cross sections in a curved shape, the tunnel cross section (the entire tunnel shell) is also rectangular. It is necessary to make it thicker than the outer shell of the tunnel including the shape, or because the uneven earth pressure acting on the leading shield lining due to the excavation of the trailing shield between adjacent element tunnels is excessive, There is a problem that it is necessary to install a support for preventing the deformation of the element tunnel, which increases the construction cost.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to make it possible to set the tunnel cross section to an arbitrary shape and to provide an economically advantageous outer lining of a large cross section tunnel. The object is to provide a construction method.

[0006]

According to the present invention, a method for constructing an outer lining body of a large-section tunnel according to the present invention (this method) includes dividing a tunnel outer portion into a plurality of small sections, and excavating and covering each small section in advance. After constructing a plurality of element tunnels and connecting adjacent element tunnels to form a shell lining, the inside of the shell lining is excavated to form a large section tunnel in the ground. In this case, the shape of each of the small cross sections is formed by connecting a circular first basic shape, two concave semicircles on one side of the circular shape, and upper and lower ends of these semicircles by straight lines of the same length. The second defined by the outline when the drum shape is combined
A basic shape (hereinafter referred to as "sunfish type".), Wherein the circular third basic shape defined on both sides by the outer when a combination of the above drum type (hereinafter referred to as "across hourglass".) And, Any of a combination of the first to third basic shapes appropriately combined so that a convex arc and a concave arc are fitted linearly or at an angle ,
The convex arc of one adjacent small cross section and the concave arc of the other small cross section are connected linearly or at an angle to form a continuous arc.
All of the above so that the tunnel shell can be formed in an array
It is characterized in that small cross sections of shapes are appropriately combined and fitted / adjacent, and each small cross section is excavated by an excavator whose excavation cross sectional shape matches the small cross section.

That is, according to the present construction method, the small sectional shape of the divisional construction unit of the tunnel outer part is circular (the diameter is equal to the thickness of the tunnel outer part), sunfish type (reference numeral 2 in FIG. 1).
s, etc.), both-end drum-shaped (reference numeral 17s in FIG. 1 and FIG. 7)
Etc.) or a combination of these shapes (see FIG. 6), for example, when the sunfish-type or the combination shape, or when the sunfish-type and the both-end drum type are adjacent to each other,
One convex arc and the other concave arc are fitted together, and the straight portions of both are angled at about 0 ° to 45 ° (in the case of an angle of 0 °, a straight line is formed).
The tunnel cross section (the entire tunnel shell) can be set to any shape by making the continuous arrangement of the small cross sections straight or curved, etc. By reducing the number of joints, economy can be improved.

[0008] In addition, the order of construction between adjacent small sections is preferably such that the convex arc side is laid first, and then the concave arc side is excavated. Since it has a cross section, the proof strength against the uneven earth pressure acting on the preceding lining by the subsequent excavation can be improved, which is advantageous as compared with the conventional rectangular cross section.

In this construction method, as the excavator, a first basic excavator whose excavation cross section is circular, and a drum-type excavator whose excavation cross section has a drum shape on one side of the first basic excavator A second basic excavator having an excavated cross-sectional shape of a sunfish type by connecting units, and a second excavator unit having an excavated cross-sectional shape of an excavated cross-sectional shape by connecting a drum type excavator unit to both sides of the first basic excavator 3
And a combination excavator in which the first to third basic excavators are appropriately combined to form a combined excavation cross-sectional shape, and the second and third basic excavators and By connecting and diverting the combination excavator with the first basic excavator and the drum type excavator unit,
Machine cost can be reduced. Incidentally, for example, a small cross section of a sunfish type can be excavated by an excavator capable of excavating independently.

[0010]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross section of a tunnel outer shell 10 for constructing an outer shell lining body according to the present invention. It consists of both sides 13,14. In carrying out the preceding excavation, the tunnel shell 10 has 18 small sections 1s
１８18s. That is, circular small cross sections 1 s and 9 s are set at the intersections of the upper and lower portions 11 and 12 and the right side portion 14, and both end-shaped small cross sections 18 s and 17 s are set at the center of the left and right side portions 13 and 14. In addition, sunfish-shaped small sections 2s to 8s and 10s to 16s are set in the entire region other than these.
Each of the small sections 1s to 18s is adjacent to each other so that the convex arc and the concave arc fit each other. In the upper and lower portions 11, 12, the linear portion of one adjacent small section and the linear portion of the other small section are adjacent to each other. It is arranged in an arch shape while being slightly angled (angle θ), and the small cross-sections on the left and right side portions 13 and 14 are straight without being angled.

Next, from the work base installed at the end of the construction section, by means of a propulsion method or a shield method according to the extension of the construction, etc., refer to each of the small sections 1s to 18s by a known closed type propulsion machine or shield excavator. Excavate and lining in numerical order. At this time, the circular small cross sections 1 s and 9 s are the first basic excavator (circular cross section excavator) 1 having a circular cutter head.
2 and 3 as a part of the second basic excavator 2 and the like.
s to 16 s are drum-shaped drum cutter heads (drum-shaped section excavators) as drum-shaped excavator units having a rotation axis 2 ″ orthogonal to the tunnel axis direction, the front face of which is shown in FIG. 2 for convenience.
2 'connected to one side of the first basic machine 1
17s, 1
8s is a third basic excavator 3 (FIG. 3) in which a drum-shaped drum cutter head 2 'is connected to both sides of the first basic excavator 1.
), And reinforced by backfilling with RC box, steel pipe, steel segment, steel frame (support member), etc., and 18 element tunnels (not shown). Build).

For a small cross section of a sunfish type or a sunfish type combined shape, an excavator 4 for convenience showing a front view in a state where two excavators are connected to each other can be used. Reference numeral 4 denotes a rotating cross-shaped first overcutter 4 ', and a single-character-shaped second cutter which swings (reciprocates) about 90 ° while excluding the cutter 4' and slightly expands and contracts.
The face can be excavated in a sunfish shape by the over cutter 4 ".

Next, a PC steel material is buried between adjacent element tunnels to be filled with non-shrink mortar, or RC (SR
C) The element tunnels are connected by a structure to integrate the element tunnels to form an outer lining (not shown). The connection between the element tunnels is performed after the convex arc (cross section) of the preceding tunnel. The connection process is easy because the concave arc (cross section) of the tunnel is fitted by the ultra-close proximity method with a small separation, and the convex arc of the preceding tunnel exhibits sufficient strength against uneven earth pressure etc. Therefore, economical and safe construction becomes possible.

After that, the ground inside the outer lining body is excavated,
Finish the inner surface.

FIG. 5 shows another example of a tunnel outer part 50 for constructing an outer lining body according to the present invention. The tunnel outer part 50 is applied to a subway and has straight upper and lower parts 51. , 52 and straight left and right side portions 53, 54
And upper and lower portions 51 and 52 and left and right side portions 53 and 54 which are inclined and connected to each other.
Is further provided with a linear middle wall portion 59 inside. Tunnel shell 50 includes small sections 41s-53 including middle wall 59
s is divided into 13 parts. Of these, small cross sections 41s and 50s
As shown in FIG. 6 (a), as shown in FIG. 6 (a), an oval first combination shape 61 is formed by combining circles on the left and right sides of a drum at both ends, and small cross sections 42s, 43s, 46s, 47s, 5
As shown in FIG. 6B, 1s and 52s have a second combination shape 6 formed by linearly combining two sunfish types.
2, set to small sections 44s, 45s, 48s, 49s
As shown in FIG. 6 (c), two sunfish-shaped
Third combination shape 6 formed by combining at an angle of 5 °
3, and the small cross section 53s is set to a double-ended drum shape (see FIG. 7). Therefore, the small cross sections 44s, 45s, 48s, and 49s corresponding to the even-angle portions 55 to 58 have both the inclined portion and the horizontal portion.

Subsequent excavation of the tunnel outer part 50 and the like are performed in the same manner as described for the outer part 10, and each of the small sections 41s to 41s
53s is performed by one excavator in which the above-described excavators are appropriately connected in the order of reference numbers. At this time, since the outer shell 50 has a larger number of combined shapes than the outer shell 10, the number of connections between the element tunnels is reduced, and the construction cost can be reduced accordingly. Since the middle wall portion 59 cannot fit the arcs into the upper and lower portions 51 and 52, a hollow portion indicated by hatching is set.

In the present invention, for example, a tunnel outer portion 80 or the like whose interior is applied to a subway station as schematically shown in FIG. 8 can be set, and the sectional shape of the element tunnel is also illustrated in FIG. Other than that, it can be set as desired.

[0019]

As described above, in the construction method of the outer shell lining body of the large-section tunnel according to the present invention, the small cross-sectional shape of the unit for dividing the outer shell portion of the tunnel is changed to a circular shape, a sunfish type, a double-ended drum shape, or the like. The tunnel cross section (entire tunnel outer part) is set to an arbitrary shape by arranging these convex shapes and convex arcs and concave arcs linearly or at an angle while fitting and adjoining them. The construction cost can be greatly reduced by using many combinations.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tunnel outer part divided into small sections.

FIG. 2 is a front view of a second basic excavator.

FIG. 3 is a front view of a third basic excavator.

FIG. 4 is a front view showing a state in which two rocking type excavators that can be excavated into a sunfish type are connected to each other, and a second overcutter is rocked to one side of a concave arc (cross section) ( A), a state (b) returning from the state (a) in the tangential direction of the concave arc, and a state (c) swinging from the state (b) to the other side.

FIG. 5 is a cross-sectional view illustrating another embodiment of the tunnel shell.

FIG. 6 is an illustration of a small cross section of a combination shape, which is an oval (a), a shape (b) in which two sunfish shapes are linearly combined, and an angled corner portion (c).

FIG. 7 is a plan view of a double-ended drum shape.

FIG. 8 is a cross-sectional view of a tunnel shell applied to a subway station.

FIG. 9 is a cross-sectional view of a tunnel shell part constructed by a conventional method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 1st basic excavator 2 2nd basic excavator 2 'Hourglass-shaped drum cutter head 2' 3 3rd basic excavator 4 Swing type excavator 10,50,80 Tunnel shell 11,51 Upper part 12, 52 Lower part 13, 53 Left part 14, 54 Right part 55-58 Even angle part 59 Middle wall part 1s-18s, 41s-53s Small cross section (element tunnel) 61 First combination shape 62 Second combination shape 63 Third combination shape

──────────────────────────────────────────────────続 き Continued on the front page (73) Patent holder 000140292 Okumura Gumi Co., Ltd. 2-2-2 Matsuzaki-cho, Abeno-ku, Osaka-shi, Osaka (73) Patent holder 000172813 Sato Kogyo Co., Ltd. 1 Sakuragicho, Toyama-shi, Toyama No. 11 (73) Patent holder 390028015 Chizaki Kogyo Co., Ltd. 2-31-2 Nishishinbashi, Minato-ku, Tokyo (73) Patent holder 000146928 Morimoto Gumi Co., Ltd. 4-11 Yuyooka-cho, Tennoji-ku, Osaka-shi, Osaka (73 ) Patentee 000112668 Fujita Co., Ltd. 4- 25-2 Sendagaya, Shibuya-ku, Tokyo (73) Patentee 000201478 Maeda Construction Industry Co., Ltd. 2- 10-26 Fujimi, Chiyoda-ku, Tokyo (72) Inventor Minoru Yamamoto Tokyo 1-15-2 Tamagawa Gakuen, Machida-shi, Tokyo (72) Inventor Toshinori Toyoda 4-10-8, Shinkino, Abiko-shi, Chiba (56) References JP-A-9-328998 (JP, A) JP-A-8-114099 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E21D 9/06 301 E21D 9/08 E21D 13/02

Claims (1)

(57) [Claims] 1. A tunnel outer part is divided into a plurality of small sections, and each of the small sections is preliminarily excavated and covered to form a plurality of element tunnels. After constructing the body, upon excavating the inside of the outer lining body and constructing a large section tunnel in the ground, the shape of each of the small sections is a circular first basic shape and one side of the circular shape. The second basic shape defined by the outer shape when the two concave semicircles and the upper and lower ends of these semicircles are connected by a straight line of the same length are combined with a second basic shape, and on both sides of the circular shape The third basic shape defined by the outer shape when the hourglass is combined, and the first to third basic shapes are fitted such that a convex arc and a concave arc are linearly or angled. combined shape composed of a combination as appropriate Tonoi
A is either displaced, continuous by fitting was attached straight or angle and the concave arc convexly curved and the other small section of one of the adjacent small section
All of the above so that the tunnel shell can be formed in an array
A method for constructing an outer lining body of a large-section tunnel, characterized in that small sections of the shapes are appropriately combined and fitted / adjacent to each other, and each small section is excavated by an excavator whose excavation section shape matches the small section.