WO2013039315A2 - Segment structure having vertical strands and horizontal shear keys and method for constructing shield tunnel using same - Google Patents

Abstract

The present invention enables each segment, in which two center through-paths and two end through-paths are formed, to be sequentially and adjacently arranged at each column in a vertical direction, wherein: horizontal segments at four columns are set as one unit such that strands are inserted, strained, and settled therein; only one strand is settled in each segment such that only the corresponding segment is settled and fixed; the segments, by the remaining three strands, located at the other columns are sequentially settled and fixed in the same manner as above via through-paths, thereby forming a foundation reaction wall through which all the four strands pass, and at the same time, segments at the other columns are also sequentially and easily settled and fixed by the remaining three strands with respect to structurally-stabilized foundation reaction wall; and the foundation reaction wall of the segments is formed and the other columns in accordance with the foundation reaction wall are sequentially settled and fixed together with a drilling operation by repeating the above steps. Thus, through said features, the invention allows the segments to be assembled in an efficient and economical manner.

Description

Segment Structure with Longitudinal Strand and Transverse Shear Key and Construction Method of Shield Tunnel

The present invention relates to a segment structure having a longitudinal strand and a transverse shear key and a method for constructing a shield tunnel using the same. More specifically, the present invention relates to a segment structure having two center passages and two end passages. Arrange sequentially in each row adjacently in the longitudinal direction, with four rows of longitudinal segments as one unit to insert, tension, and anchor the strands, and to ensure that only one strand is anchored in each segment so that only those segments are fixed and fixed. The remaining three strands are settled and fixed sequentially in the same way as the segments located in the other rows through the passageway, thereby forming a segment-based reaction wall through which all four strands penetrate, and at the same time structurally stable foundation reaction wall Segment of different columns by the remaining three strands Fixation and fixation are facilitated sequentially, and by repeating the above process, fixation and fixation of the segment foundation reaction wall and thus other columns is sequentially performed with excavation.

The assembly of the segments is efficient and economical, which is a useful invention for shield tunnels.

The shield tunnel method is a method of assembling and dismantling segments by a shield tunnel drilling device and at the same time assembling a supporter.

More specifically, the shield tunnel method is excavated by the rotation of the tip cutter head of the shield tunnel excavator, and the soil produced by the excavation is disposed of and discharged out through a screw conveyor provided in the shield tunnel excavator. It is a process consisting of a series of systems for assembling segments that are supported by space.

Shield tunnel excavators are generally well known.

Among them, the shield tunnel drilling apparatus described in Patent Publication No. 93-006410 is as follows. (See Fig. 1)

The shield tunnel excavator 10 is largely composed of a cutter head 16, a head portion 22, a shield body 12, and a tail portion 24.

An opening 86 is formed at an upper portion of the partition 30, and a lid 88 hinged to the partition 30 is disposed at the opening 86. The lid 88 is connected to the piston rod 92 of the cylinder 90 attached to the diaphragm 32 via the arm 94.

The lid 88 normally closes the opening portion 86 by the cylinder 90, but the earth pressure applied to the space portion between the partition 30 and the cutter head 16 is set in the cylinder 90. When the pressure is exceeded, the opening 86 is opened to be driven toward the diaphragm 32 against the pressure of the cylinder 90 so as to introduce the sand into the grinding chamber 28.

In the grinding chamber 28, the rotor 96 and the stator 98 which comprise the crusher which crushes the comparatively large gravel which entered the grinding chamber 28 are arrange | positioned. The rotor 96 is attached to the rotation shaft 68, and the stator 98 is attached to the partition wall 30 below the rotor 96. High pressure water is also sent to the grinding chamber (28) via the feed pipe (100), and the supplied water is discharged to the rear of the shield body (12) via the discharge pipe (102) together with the soil in the grinding chamber (28). do. At the start of drilling, the propulsion jacks 14 of the drilling device 10 have the piston rods 46 and 48 being retracted into the cylinder 40.

In this state, the excavator 10 receives the propulsion force of the shield body 12 by the propulsion jacks 14, and each motor 70 of the rotating mechanism 18 is rotated, and the rotation of each motor 70 is reduced. The cutter head 16 is rotated by being transmitted to the face plate 58 via the 72, the tooth 74, the tooth 76 and the rotation shaft 68. It is pushed while being excavated by the rotation of the cutter head 16. The excavated earth and sand enters the space in front of the partition wall 30, and then enters into the grinding chamber 28 via the opening 86 of the partition wall 30 and then discharges the discharge pipe 102 from the grinding chamber 28. It is discharged with water via diesel. As the shield body 12 is advanced, the segment 104 is disposed in the space formed behind the shield body 12.

It looks at the problem of the prior art Patent No. 10-0936471 constructed by the shield tunnel drilling device as described above. (See Fig. 2)

The inventors and applicants of registered patent 10-0936471 are the same as the inventors and applicants of the present application.

Circular shield support ball (10) consists of seven segments and is fixed by the key (K) segment.

Four sides of each segment have a drainage flow path 16 and a drainage structure provided with a water stop 18 before and after the drainage flow path 16. By installing the water repellent agent, even if penetrated through the junction while preventing the penetration of the infiltration through the drainage flow path 16 is a structure that is to be discharged out.

As described above, Patent No. 10-0936471 is a structure having a cross-sectional joint where all the end joints of 7 segments meet in one plane, even though the permeation prevention and treatment are perfectly achieved by the drainage structure. Since there is no longitudinal binding structure (e.g., steel wire structure) to connect and bind, there is a problem that the cross-section joint is easily shifted up and down even by the biasing caused by the ground. The impact of the earthquake is greater and more serious than the problem of partial pressure. Absolute preparations for earthquakes are required. Legally mandatory seismic design is considered to reflect the seriousness of this problem.

Since the volleyball structure of Patent No. 10-0936471 also assumes that the segment joints are not arranged in a zigzag form, it is considered to be the first priority to connect and bind the cross-sectional joints with each other.

(a) In the present invention, two center passages, and two end passages, are arranged in sequence in each row of adjacent segments longitudinally adjacent to each other, and a strand is inserted using four rows of longitudinal segments as a unit. ㆍ Tension and fixation are allowed, and only one strand is settled in each segment so that only the segment is settled and fixed.The remaining three strands are settled and fixed sequentially in the same way as the segments located in the other column through the passageway. As a result, a segment foundation reaction wall through which all four strands penetrate is formed, and at the same time, the other three strands make it easier to fix and fix segments of other rows sequentially based on structurally stable foundation reaction walls. The repetition of sequential ordering and fixation of the segment foundation reaction wall and subsequent heat Its purpose is to make the assembly of the segment more efficient by being done with drilling.

(b) Shear stress and stranded wires are formed by forming shear keys in the transverse direction of each segment, arranging segments in each row in a zigzag shape, and arranging strands to form segment-based reaction walls. The overlap stiffness is increased to provide a rigid segment structure with high durability against earthquakes, etc.

(c) Another aim is to minimize the eccentric moment due to the bias of earth pressure by placing two center passages close to the center line and two end passages close to both ends.

The configuration of the present invention is as follows. (See Figs. 4, 5, 6, and 7)

In the present invention, two center passages (10) and two end passages (20) are formed at right angles to the cross-section joint, but the two center passages (10) are provided with stranded wire passages (F3, F4) and strands. While the fixing units G1 and G2 are formed, the strand wire fixing units G1 and G2 are located in the direction of the tunnel excavation, and the two end passages 20 include the strand wire inserting and fixing space portions E1 and E2. While the strand line passages F1 and F2 are formed, the strand line insertion / fixing space portions E1 and E2 and the strand line fixing portions G1 and G2 are located in opposite directions, while Qa = Basic set-up A (A1 = A2 = A3 = A4) with a shear key having the relation Pa, Qb = Pb, Qc = Pc = 2Qa = 2Pa is formed, and A1 and A4 are in contact with the lower end and placed on A1. Arrange A2 → B and A3 → C on A4 in this order, and insert a K segment between B and C, but the B, C, and K segments are the same as the basic set A. The segment is formed at the lower Qa of the Q straight line, and the C segment is formed at the upper Qa of the Q straight line by Qd longer than Qa, and the corresponding K segment is formed at the upper and lower Qa of the Q straight line by Qd shorter than Qa. Segment structure having a longitudinal strand and a transverse shear key.

In addition, the strand anchoring unit G1, G2 has a conical hole corresponding to the tip male cone of the strand, and the strand insertion / fixing space portions E1, E2 have a space portion corresponding to the trailing edge of the strand. A segment structure having a directional strand and a transverse shear key.

A segment structure having a longitudinal strand and a transverse shear key, wherein a flow path groove and a water-expansion index agent are formed at each segment four-faced joint.

The shield tunnel of the present invention has a circular cross section as shown in FIG. The number of segments forming a circular cross section is an odd number. Seven or five are preferred.

For convenience of description, it will be described with seven segments.

First, the shape of each segment is demonstrated.

The present invention is composed of a basic segment A, a key segment K, and a B and C segment adjacent to the K segment. (A1 = A2 = A3 = A4.)

As shown in Fig. 4, the basic segment A has a structure in which shear keys having a relationship of Qa = Pa, Qb = Pb, and Qc = Pc = 2Qa = 2Pa with respect to P and Q lines are formed in grooves and irregularities.

As shown in Fig. 9, the segments of each row are assembled and arranged in a zigzag form.

Like the first column, the third column, and the fifth column, the odd columns are arranged in the same position, and the even columns of the second column, the second column, and the sixth column are located in the center line of the A segment. That is, it is located down by 1/2 of A.

The K segment is assembled wedge-shaped as a key segment.

The K segment is the same as the basic segment A, but is formed shorter by Qd than Qa in the upper and lower Qa of the Q straight line.

The B and C segments are adjacent to the K segment and differ only from the basic segment A only in the adjacent plane. The B segment is formed at the lower Qa of the Q straight line, and the C segment is longer than Qa at the upper Qa of the Q straight line.

Zigzag assembly of the segments is made by two adjacent segments at Qc and Pc. For example, two Qa are assembled adjacent to each other in Qc (see Fig. 9).

As described above, although the structure of each segment is only slightly different from the K segment and the adjacent B and C segments, the segment is easy to manufacture because it is not significantly different from the basic A segment.

Next, the twisted line penetration path of each segment is demonstrated.

In each segment, two center passages 10 and two end passages 20 are formed parallel to each other at right angles to the cross-sectional joint.

The two center passages 10 are close to the center line of the segment, and the two end passages 20 are symmetrical about the center line while being close to the ends. Since the strand should pass through the center passage 10 through the end passage 20, the distance between the center line and the end is the same.

The stranded wire starting from the insertion / fixed space portions E1 and E2 of the end passage 20 passes through the stranded wire anchoring portions G1 and G2 of the center passage 10 as shown in FIGS. 9 and 10. It is a zigzag connection structure settled at (G1, G2). In addition, the closer the strand line fixing portions G1 and G2 of the center passage 10 are to the center line, the more the eccentric bending moment due to earth pressure can be minimized, and a rigid structure of the segment can be formed.

The insertion / fixed space portions E1 and E2 are formed on one side of the end passage 20, and the strand wire fixing portions G1 and G2 are formed on one side of the center passage 10, and are located in opposite directions.

The strand wire insertion / fixing space portions E1 and E2 are spaces into which a new strand wire is inserted.

In the conical holes of the stranded wire anchoring sections G1 and G2, the male cone of the stranded wire is fixed, and the trailing edge of the stranded wire is fixed to the stranded wire insertion / fixing spaces E1 and E2.

The water-expandable index member may be formed around the channel grooves in the center at all the contact portions where the segments and the segments contact each other.

(a) In the present invention, two center passages, and two end passages, are arranged in sequence in each row of adjacent segments longitudinally adjacent to each other, and a strand is inserted using four rows of longitudinal segments as a unit. ㆍ Tension and fixation are allowed, and only one strand is settled in each segment so that only the segment is settled and fixed.The remaining three strands are settled and fixed sequentially in the same way as the segments located in the other column through the passageway. As a result, a segment foundation reaction wall through which all four strands penetrate is formed, and at the same time, the other three strands make it easier to fix and fix segments of other rows sequentially based on structurally stable foundation reaction walls. The repetition of sequential ordering and fixation of the segment foundation reaction wall and subsequent heat Since the configuration is made with the excavation, the assembly of the segment has an efficient and economical effect.

(b) Shear stress and strand due to shear key are formed by forming shear key in the transverse direction of each segment, and arranging the segments in each row in a zigzag form and forming a stranded reaction wall to form a segment-based reaction wall. Overlap stiffness is increased, resulting in a strong segment structure having high durability against earthquakes.

(c) Since the two center passages are close to the center line and the two end passages are close to both ends, the eccentric moment due to eccentricity of earth pressure is minimized and structurally stable.

1 is a cross-sectional state diagram of a shield tunnel excavator generally used.

2 is a perspective view of a conventional shield segment

3 is a circular cross-sectional view of the shield segment of the present invention.

4 is a perspective view of the basic segment A of the present invention.

5 is a perspective view of the B segment of the present invention.

6 is a perspective view of the C segment of the present invention.

7 is a perspective view of the K segment of the present invention.

8 is an enlarged view of FIG.

9 is a plan view showing a state in which the segments of the present invention are arranged in a zigzag form

FIG. 10 is a schematic diagram illustrating passage and settling of a stranded wire for an A1 segment in a fourth row in FIG.

11 is a perspective view of a segment used in the conventional bolt method

12 is a cross-sectional view of the joints of FIG. 11 joined by bolts.

<Brief Description of Drawings>

G1, G2; Stranded anchorage

E1, E2; Strand insertion and fixed space part

F1, F2, F3, F4; Stranded passage

10; Center passage

20; End passage

The construction method of the shield tunnel using the segment structure having the longitudinal strand and the transverse shear key of the present invention will be described in detail with reference to the accompanying drawings.

First, the basic concept for the insertion and fixing of the stranded wire in the zigzag segment of the present invention will be described.

The length of the strand is approximately equal to the length of four longitudinal segments arranged. This is because the stranded wire connects and fixes the four longitudinal segments in one unit. One unit of the strand is a four segment row. As shown in FIG. FIG. 10 is a schematic diagram of four strands for A1 in the fourth row in the segment assembly of FIG.

For example, the stranded ship starting from the first row E2 in Fig. 10 is tensioned and settled in the fourth row G1. Four strands pass through A1 in the fourth row. At this time, the starting point and the fixation point of the four strands passing through A1 in the fourth column are different. Settled in column A1 of the fourth row is the only stranded ship starting from the first row. This strand secures A1 in the fourth row first. In the state where A1 of the fourth column is fixed in this manner, the strands start in the second row, the third row, and the fourth row. In the state where A1 of the fourth column is not fixed, the strands of the second, third, and fourth columns cannot pass through A1 of the fourth column. This is because it is virtually impossible to pass through the A2 in the fifth row, where the second strand of the strand is not fixed.

A1 of the fourth row must be fixed by the stranded ship starting from the first row E2, so that the stranded ship starting from the second row passes through A1 of the fourth row and is then settled in the fifth row. This is because the fifth column is possible only when the fourth column is fixed. In addition, in order for the stranded ship starting from the third row to be able to settle the sixth row, the fifth row and the fourth row may be fixed at the same time.

All segments pass through all four strands, but only one strand is settled in that segment, and the remaining three strands pass through A1 in the fourth row and are subsequently settled in the next row. In other words, segment foundation reaction wall is made by the settlement of the strand, and then another foundation reaction wall is repeatedly formed in the direction of excavation while strengthening the foundation reaction wall by the three strands.

According to Fig. 10, the four strands in the fourth row are the strands starting from the first row, the second row, the third row, and the fourth row. In other words, the stranded ship that has been tensed and settled in the fourth row G1 starting from the first row E2 and has left the second row E2 is the stranded ship that has been tensed and settled in the fifth row G1. Similarly, the stranded wire is tensioned and settled in the third row E1 to the sixth row G2, and tensioned and settled in the fourth row E1 to the seventh row G2.

As described above, the strands inserted into the four throughways of the fourth row are the strands starting from the first row, the second row, the third row, and the fourth row, and at the same time relying on the fourth row, the fifth row, the sixth row, and the seventh row. It is a supporting member which fixes and fixes heat sequentially. It is for this reason that A1 in the fourth column is called the base reaction wall.

In addition, the shear stress of the shear key increases as the segments of each row are arranged in a zigzag, and the four strands are fixed and fixed only one for each row. Therefore, the overlapping stiffness of the strands increases, which is robust against earth pressure and earthquake. Construction is facilitated because it serves as a foundation reaction wall for the segments that are subsequently constructed while forming the structure. In addition, the length of the strand is the length at which the tensile force is maximized while the loss is minimized.

For convenience of description, seven segments have been described, but the number of segments is the same concept as the above, whether the number of segments is five or seven.

However, in the first column, the second column, and the third column of FIG. 10, the foundation reaction wall is not provided. This is inevitable because the segments and strands are assembled in a zigzag.

For the first row, the second row, and the third row, the conventional bolt method and the assembly method of the present invention will be performed in parallel. Since the conventional bolt method is a widely used method, only the outline thereof will be described briefly by Korean Patent Laid-Open Publication No. 10-2004-0026598.

As shown in FIG. 11, the vertical bolt box 13 and the horizontal bolt box 12 are formed in the segment of JP-A-10-2004-0026598. Only the transverse bolt box 12 is connected in the transverse direction and the longitudinal bolt box 13 is omitted and the longitudinal strand line passage of the present invention is formed in the longitudinal direction. First, the lateral bolt box 12 is bolted, and then the stranded wire is tensioned and fixed to the longitudinal stranded wire passage in the same manner as above.

FIG. 12 shows a state in which the lateral bolt boxes 12 are in contact with each other and fixed as the fixing bolts 7 and the nuts 8.

Now, a method for constructing a shield tunnel using a segment structure having a direction strand and a transverse shear key according to the present invention will be described.

(a) In the drilling tunnel space, seven segments are arranged in the same shape and structure as in claim 1, and A1 → A2 → B and A4 → A3 → C, respectively, with A1 and A4 in contact with the lower end. Arranging and positioning them in a circular state, and inserting and fixing a K segment between B and C to form a first row;

(b) Arrange and position each segment of the second column adjacent to the first column so as to have a circular state as in the first column, with the end of A1 of the second row in the center line of A1 of the first row so that the end of A1 of the second row is equal to half of the first row. Arranging the second rows staggered with each other, and then fixing the segments by inserting fixing bolts into the transverse bolt boxes 13 of the first row and the second row;

(c) Arrange and position each segment of the third row adjacent to the second row with the same height as the first row, with the second row and the third row staggered by one half of A1, and then Fixing each segment by inserting fixing bolts into the horizontal bolt boxes 13 of rows and columns;

(d) Insert the strand into the strand insertion / fixing space portion E2 of each segment (A1, A2, B, K, C, A3, A4) of the first row, and then (F3-G1) → E2-F2) → After passing through (F3-G1) in the fourth row, tension and anchor the strand to the strand anchorage part G1 of each segment (A1, A2, B, K, C, A3, A4) located in the fourth row. To fix each segment located in the fourth column, and insert the strand into the strand-inserting / fixing space portion E2 of each segment in the second column, and (F3-G1) in the third column → (E2-F2) in the fourth column. After passing through (F3-G1) in the fifth row, the strands are tensioned and fixed to the strand anchorage part G1 of each segment (A1, A2, B, K, C, A3, A4) located in the fifth row, While the segments are fixed, the strands are inserted into the strands and fixed space portions E1 of each segment in the order of the third row and the fourth row in the same manner as described above, and the sixth and seventh rows are placed in the sixth and seventh rows, respectively. Segman The step of fixing the respective segments in the sixth column and the seventh column in tension and fixing the strand in the strand fixing portion G2 of (A1, A2, B, K, C, A3, A4);

(e) Each segment of the fifth row is fixed by the insertion and tension of the strand in the second row, and each segment of the sixth row is fixed by the insertion and tension of the third row. Fixing each segment located in the eighth row in the same manner as the first row by inserting and stretching the fifth strand of the strand in the state where the segments are fixed;

(f) Each segment fixing in column 9 is by inserting / tensioning in the sixth row, and each segment fixing in column 10 is fixed by inserting / tensioning in the seventh row. Is a step of assembling the shield tunnel sequentially by inserting and tensioning the strand wire of the n-th column. The shield tunnel construction method using the segment structure having the directional strand and the transverse shear key is included.

In addition, a segment male having a directional strand and a transverse shear key, characterized in that a male tip of the strand is fixed in a conical hole formed in the strand anchoring portions G1 and G2, and the rear fixed portion of the strand is fixed to the strand insertion / fixing space portions E1 and E2. Shield tunnel construction method using

Claims (5)

Two center passages (10) and two end passages (20) are formed at right angles to the cross-section junction, and the two center passages (10) are provided with the strand line passages (F3, F4) and the strand anchorage portion (G1). , G2) is formed, and the strand wire anchoring portions G1 and G2 are located in the direction of the tunnel excavation, and the two end passage passages 20 include the strand wire insertion / fixing space portions E1 and E2 and the strand wire passageway. While the F1 and F2 are formed, the strand insertion and fixing space portions E1 and E2 and the strand anchor fixing portions G1 and G2 are located in opposite directions, while Qa = Pa and Qb = with respect to the P and Q straight lines. A basic piece A (A1 = A2 = A3 = A4) having a shear key having a relationship of Pb, Qc = Pc = 2Qa = 2Pa is formed, and A1 → A4 is contacted on the lower end with A2 → B and Arrange A3 → C on A4 in order, and insert K segment between B and C, but B, C, and K segments are the same as basic set A, but B segment In the lower Qa of the Q straight line, and the C segment is formed by Qd longer than Qa in the upper Qa of the Q straight line, and the corresponding K segment is formed by Qd shorter than Qa in the upper and lower Qa of the Q straight line. Segment structure having a longitudinal strand and a transverse shear key The method of claim 1 Longitudinal direction characterized by a conical hole corresponding to the male cone of the stranded wire in the strand anchoring parts G1 and G2, and a space corresponding to the rear fixed part of the stranded wire in the strand insertion and fixing space parts E1 and E2. Segment Structure with Strands and Transverse Shear Keys The method according to claim 1 or 2 A segment structure having a longitudinal strand and a transverse shear key characterized in that a flow path groove and a water-expansion index agent are formed at each segment four-sided junction. (a) In the drilling tunnel space, seven segments are arranged in the same shape and structure as in claim 1, and A1 → A2 → B and A4 → A3 → C, respectively, with A1 and A4 in contact with the lower end. Arranging and positioning them in a circular state, and inserting and fixing a K segment between B and C to form a first row; (b) Arrange and position each segment of the second column adjacent to the first column so as to have a circular state as in the first column, with the end of A1 of the second row in the center line of A1 of the first row so that the end of A1 of the second row is equal to half of the first row. Arranging the second rows staggered with each other, and then fixing the segments by inserting fixing bolts into the transverse bolt boxes 13 of the first row and the second row; (c) Arrange and position each segment of the third row adjacent to the second row with the same height as the first row, with the second row and the third row staggered by one half of A1, and then Fixing each segment by inserting fixing bolts into the horizontal bolt boxes 13 of the row and the third row; (d) Insert the strand into the strand insertion / fixing space portion E2 of each segment (A1, A2, B, K, C, A3, A4) of the first row, and then (F3-G1) → E2-F2) → After passing through (F3-G1) in the fourth row, tension and anchor the strand to the strand anchorage part G1 of each segment (A1, A2, B, K, C, A3, A4) located in the fourth row. To fix each segment located in the fourth column, and insert the strand into the strand-inserting / fixing space portion E2 of each segment in the second column, and (F3-G1) in the third column → (E2-F2) in the fourth column. After passing through (F3-G1) in the fifth row, the strands are tensioned and fixed to the strand anchorage part G1 of each segment (A1, A2, B, K, C, A3, A4) located in the fifth row, While the segments are fixed, the strands are inserted into the strands and fixed space portions E1 of each segment in the order of the third row and the fourth row in the same manner as described above, and the sixth and seventh rows are placed in the sixth and seventh rows, respectively. Segman The step of fixing the respective segments in the sixth column and the seventh column in tension and fixing the strand in the strand fixing portion G2 of (A1, A2, B, K, C, A3, A4); (e) Each segment of the fifth row is fixed by the insertion and tension of the strand in the second row, and each segment of the sixth row is fixed by the insertion and tension of the third row. Fixing each segment located in the eighth row in the same manner as the first row by inserting and stretching the fifth strand of the strand in the state where the segments are fixed; (f) Each segment fixing in column 9 is by inserting / tensioning in the sixth row, and each segment fixing in column 10 is fixed by inserting / tensioning in the seventh row. Is a step of assembling the shield tunnel sequentially by inserting and tensioning the strand wire of column n-3; and a method of constructing a shield tunnel using a segment structure having a direction strand and a transverse shear key The method according to claim 4 A segment structure having a directional strand and a transverse shear key is characterized in that a male tip of the strand is fixed in a conical hole formed in the strand anchoring portions G1 and G2, and the rear fixed portion of the strand is fixed to the strand insertion / fixing space portions E1 and E2. Construction method of shield tunnel using

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