JP2006118306A - Construction method of shield tunnel, and bent bolt joint for use in the method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that construction work is complicated, because post work for embedding a bolt box formed of a large recess is needed, after segments are joined together by fastening nuts to both ends of a bent bolt, in the case of a conventional bent bolt joint. <P>SOLUTION: In this construction method for a shield tunnel, a curved hole 13, which continues into an inner surface 12 of the segment 2 and an end surface 11 thereof, is preformed in the segment 2; the bent bolt 15 is inserted into the curved holes 18 of the two segments 2 which continue into each other by making the end surfaces of the two segments butt against each other; the segments 2 and 2 are joined together by fixing the bent bolt 15 by means of a fastening member (nut 17) so that the bent bolt 15 cannot come off from the curved hole 18, under a state wherein both the ends (ends 23 and 23) of the bent bolt 15 are protruded from the inner surfaces 12 of the respective segments 2; and after that, the fastening of the bent bolt by the fastening member in a joint part between the segments is released, so that the bent bolt 15 can be pulled out and detached from the curved hole 18. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method of constructing a shield tunnel by joining segments with a bent bolt.

In shield construction, if the segments are to be joined with bent bolts, if the bent bolts are protruded inward from the inner surface of the segments, the post work must be performed after covering the protruding portions with concrete or the like. It ’s hard. For this reason, a structure is known in which a bolt box recessed from the inner surface of the segment in the direction of the outer surface of the segment is formed and both ends of the bent bolt are not protruded inward from the inner surface of the segment (see Patent Document 1, etc.).
JP 7-150893 A

  However, in order to fasten the nuts provided at both ends of the bending bolt so that the bending bolt does not come out of the bending hole, a fastening tool such as a spanner is required, and as the recess forming the bolt box, In order to secure a working space for using the fastening tool, it is necessary to form a large recess. Therefore, after the nuts are fastened to both ends of the bending bolt and the segments are joined to each other, a post-operation for filling the bolt box formed by the large concave portion is necessary, so that the construction becomes complicated.

According to the present invention, in the shield tunnel construction method in which the segment is assembled behind the shield machine and the tunnel is constructed, the segment is formed with a curved hole continuous between the inner surface and the end surface of the segment. Insert the bending bolts into the bending holes of the two segments where the end faces of the segments are connected to each other, and keep both ends of the bending bolts protruding from the inner surfaces of the segments so that the bending bolts do not come out of the bending holes. As described above, the segments are joined together by fixing with a fastening member, and the fastening by the fastening member of the bent bolt of the joint portion is later released, and the bent bolt is pulled out from the bent hole and removed.
According to the bent bolt joint used in the method for constructing a shield tunnel of the present invention, when the end surfaces of two segments are brought into contact with each other, a bent hole in which the openings at both ends are continuous with the inner surface of each segment, and the inside of the bent hole The bolt is inserted into the two segments and bent at both ends through the openings on the inner surface of the two segments, a washer passing through the end of the bent bolt and seated on the inner surface of the segment, and a threaded portion at the end of the bent bolt By pressing the washer against the inner surface of the segment, it is formed with a fastening member that fixes the bending bolt so that it does not come out of the bending hole and joins the segments, and the washer has a shape corresponding to the curved surface of the inner surface of the segment A curved surface portion formed on the pressure member, a pressure receiving surface that receives pressure from the fastening member, and a bent bolt through hole that is passed through to connect the curved surface portion and the pressure receiving surface. I was painting. Instead of the washer, it is formed in a cylindrical shape, and a part or all of one end surface of the cylindrical tube and a part of the peripheral surface of the cylindrical tube are formed in a recess formed near the opening of the curved hole in the inner surface of the segment. The washer to be stored was used. In addition, other bent bolt joints include a bent hole in which openings at both ends are continuous with the inner surface of each segment when the end surfaces of the two segments abut each other, and the inner surfaces of the two segments inserted into the bent holes. Formed by a bent bolt with both ends protruding from the opening, a washer that passes through one end of the bent bolt and is seated on the inner surface of the segment, and a fastening member that is fastened to a screw portion formed at one end of the bent bolt The other end of the bending bolt is provided with a locking portion and a knob which are larger than the diameter of the opening of the bending hole formed on the inner surface of the segment and engage with the inner surface of the segment. A fastening member is fastened to the threaded portion and the washer is pressed against the inner surface of the segment to fix it, and the locking portion is locked to the inner surface, so that the bent bolt is not pulled out of the bent hole. Joining the segments together are.

  According to the shield tunnel construction method of the present invention, since the bent bolts are removed from the bent holes after joining the segments with the bent bolt joint, both ends of the bent bolt protrude from the inner surface of the segment when joining. Thus, a bolt box having a large recess as in the prior art can be dispensed with, and post-processing required to fill the opening of the bent hole can be facilitated. By using a washer having a curved surface formed in a shape corresponding to the curved surface of the inner surface of the segment, it is not necessary to form a recess in the inner surface of the segment, and post-processing required to fill the opening of the bent hole can be facilitated. . The use of a cylindrical washer can reduce the manufacturing cost of the washer, which is economically advantageous, and the recess formed on the inner surface of the segment to accommodate the cylindrical washer reduces the work space for the fastening tool. Since it is not necessary to ensure, it can be made small, so that the post-operation for filling the recess can be reduced. By using a bent bolt with a locking portion and a knob at the other end, the fastening work of the fastening member can be reduced, and a person can grasp the knob and easily pull out the bent bolt from the bent hole. Therefore, it is possible to facilitate the work.

  1 to 3 show this embodiment, FIG. 1 shows a method for joining segments in a shield tunnel construction method, FIG. 2 shows a cross-section of a joint portion between segments using a bent bolt, and FIG. 3 shows a shield construction method. The outline of the construction method of the shield tunnel is shown.

  As shown in FIG. 3, in the shield work, a plurality of segments 2 are joined to the rear of the shield machine 1 to assemble the cylindrical wall body 3, and the propulsion jack of the shield machine 1 is formed on the front surface 4 of the assembled cylindrical wall body 3. 5, the shield machine 1 is propelled by driving the shield machine 1 and excavating the natural ground 100, and then a new cylindrical wall body 3 is assembled on the front surface 4 of the cylindrical wall body 3. Thereafter, the propulsion of the shield machine 1 and the cylindrical wall body are assembled. The assembly of 3 is repeated and a tunnel wall body is constructed. Each segment 2 is a plate-shaped concrete product formed in a shape corresponding to a part of a cylindrical peripheral surface divided at a predetermined angular interval with the center line of the cylindrical wall 3 as a reference. That is, it is a part that constitutes a shield tunnel.

  The segments 2 are joined by an inter-segment joint that joins the segments 2 along the circumferential direction of the tunnel to be constructed and an inter-ring joint that joins the segments 2 along the traveling direction of the tunnel. In this embodiment, as shown in FIG. 1B, a bent bolt joint 6 as a temporary joint is used for joining the segments 2 to each other, and a well-known pin joint 7 is used for joining the rings between the segments 2.

  Hereinafter, in the segment 2, a direction corresponding to the direction along the traveling direction of the tunnel will be described as a width direction, and a direction of making one round of the tunnel circumferential surface will be described as a circumferential direction. As shown in FIG. 1, among the end faces 8; 9 on both sides in the width direction of the segment 2, one end face 8 is provided with a pin joint 7 protruding from the end face 8, and the other end face 9 A pin joint receiving hole 10 into which the pin joint 7 provided in the segment 2 to be joined to the segment 2 is fitted is formed. On the side close to one end surface 9 among the end surfaces on both sides in the width direction of the segment 2 and on both end surfaces 11; 11 side in the circumferential direction of the segment 2, the end surface 11 in the circumferential direction of the segment 2 and the segment A bent hole 13 penetrating the inner surface 12 is formed. As shown in FIG. 4, a tube 14 made of metal or vinyl chloride is inserted into the bending hole 13.

  The bent bolt joint 6 includes a bent bolt 15, a washer 16, a nut 17 as a fastening member, and a bent hole 18. The length of the bending bolt 15 is longer than the length of the bending hole 18 formed by two end holes 11 in the circumferential direction of the two segments 2; 2 and the two bending holes 13; The washer 16 connects the curved surface portion 19 formed in a shape corresponding to the curved surface of the inner surface 12 of the segment 2, the pressure receiving surface 20 that receives pressure by fastening the nut 17, and the curved surface portion 19 and the pressure receiving surface 20. A bent bolt through hole 21 is provided. That is, the washer 16 is formed as a curved surface portion 19 by processing one end of the cylindrical washer into a shape corresponding to the curved surface of the inner surface 12 of the segment 2. The bending bolt 15 is inserted into the bending hole 18 by sliding in the tube 14 in the bending hole 18, and both ends 23 of the bending bolt 15 from the openings 22 at both ends of the bending hole 18 extending to the inner surface 12 of the segment 2. Project the same length. A threaded portion 24 is formed on the peripheral surface of the end portion 23 protruding from the opening 22. In a state where the curved surface portion 19 of the washer 16 passing through the end portion 23 through the bolt through hole 21 of the washer 16 is brought into contact with the inner surface 12 of the segment 2, the screw portion 24 extends beyond the pressure receiving surface 20 of the washer 16 to the vicinity of the opening 22. Therefore, when the nut 17 is inserted into the threaded portion 24 and fastened, the washer 16 can be pressed against the inner surface 12 of the segment 2 by tightening the nut 17, and the bending bolt 15 is inserted from the bending hole 18. It is firmly fixed so that it does not come off. The segments 2 are joined together by the bent bolt joint 6 having such a configuration.

  A method for constructing a shield tunnel will be described with reference to FIG. The shield machine 1 is driven by the reaction force of the propulsion jack 5 on the front surface 4 of the cylindrical wall 3 (see FIG. 3) that has already been assembled, and the ground 100 is dug. Assemble the wall 3. At this time, as shown in FIG. 1A, after the end surfaces 11; 11 in the circumferential direction of the two segments 2 are brought into contact with each other and the bending holes 13; 13 are in communication with each other, In addition, the bending bolt 15 is inserted into the tube 14 provided in the bending hole 13 in advance during molding by the mold, and the both ends 23; 23 of the bending bolt 15 are connected to the two segments 2; The washer 16; 16 is inserted into both ends 23; 23 of the bending bolt 15 that protrudes from the inner surface 12 and protrudes from the inner surface 12 of the segment 2, and nuts 17; 17 are inserted into the screw portions 24; 24 of the both ends 23; 23. Conclude. As described above, the segments 2 are joined to each other by the bent bolt joint 6. Thereafter, the ring 2 between the segment 2 joined by the bent bolt joint 6 and the new segment 2 is joined by the pin joint 7, and the segments of the segments 2 are joined by the bent bolt joint 6. Repeat the above to build a shield tunnel. In this construction operation, the joint portion by the bent bolt joint 6 is generated by the construction load by leaving the segment 2 having the joint portion subjected to the construction load (digging thrust of the shield machine 1) as it is. It is possible to prevent the difference between the segments 2; 2 (the difference between the positions of the inner surface 12; 12) and the opening (the gap between the end surfaces 11; 11). The bent bolt 15 is removed when the construction load acting on the segment 2 joined by the bent bolt 15 is out of the influence range, and the new segment 2 to be assembled on the shield machine 1 side; Used for joining. The magnitude of the load during construction falls outside the range of influence, for example, the distance X between the front surface 4 that is the pressure receiving surface of the segment 2 on the tip side that receives the pressure of the propulsion jack 5 and the joint portion by the bent bolt joint 6 (Refer to FIG. 3) is 20 m to 30 m. That is, when the joint portion by the bent bolt joint 6 is separated from the shield machine 1 so as not to be affected by the propulsive force of the shield machine 1, the fastening by the nut 17 of the bent bolt 15 at the joint portion is released and the bent bolt is released. 15 is pulled out from the bending hole 18 and removed. The opening 22 of the bending hole 18 after removing the bending bolt 15 is filled with a sealing material such as a cap or mortar not shown. In this case, since it is only necessary to close the opening 22 opened in the inner surface 12 of the segment 2, the post-processing for closing the opening 22 is simplified, and the work is performed in comparison with the post work for filling the bolt box formed by the large concave portion as in the prior art. Becomes easy. That is, by using the washer 16 provided with the curved surface portion 19 formed in a shape corresponding to the curved surface of the inner surface 12 of the segment 2, both end portions 23; 23 of the bending bolt 15 are connected to the inner surface 12 of the segment 2 at the time of joining. Since the bent bolt 15 is removed from the bent hole 18 after joining the segments 2; 2 by the bent bolt joint 6, the work space for using the fastening tool of the nut 17 can be provided. It is no longer necessary to form a bolt box with a recess for securing the inner surface 12 of the segment 2, and post-processing required to fill the openings 22; 22 of the bent holes 18 can be facilitated.

Other forms
A washer 30 formed in a columnar shape as shown in FIG. 4 may be used. The columnar washer 30 is housed in a recess 33 formed in the vicinity of the opening 22 of the bent hole 18 in the inner surface 12 of the segment 2, with all (or part) of the one end surface 31 and part of the peripheral surface 32. In addition, the other end surface 34 serving as a pressure receiving surface that receives pressure from the nut 17 and a bent bolt through-hole 35 penetrating so as to connect between the one end surface 31 and the other end surface 34 are provided. When this washer 30 is housed in the recess 33, the nut 17; 17 fastened to the threaded portion 24; 24 of both ends 23; 23 of the bending bolt 15 protrudes from the inner surface 12; 12 of the segment 2; 2. Set to Such a column-shaped washer 30 is economically advantageous compared to the case where the special washer 16 having a curved lower surface as described above is used. Further, unlike the prior art, it is not necessary to form a large recess for securing a work space for using a fastening tool such as a spanner, and the recess 33 is formed after the bending bolt 15 is pulled out and removed from the bending hole 18. Less work after filling.

Other forms
A bending bolt 40 as shown in FIG. 5 may be used. The bent bolt 40 has a threaded portion 24 formed at one end 41 and a diameter larger than the diameter of the opening 22 of the bent hole 18 formed in the inner surface 12 of the segment 2 at the other end 42 and is engaged with the inner surface 12. A stop 43 and a knob 44 are provided. In other words, the other end portion 42 includes a bent bolt 40 in which a locking portion 43 and a knob portion 44 are integrally formed. The bending bolt 40 is inserted into the bending hole 18 from the one end 41 side of the bending bolt 40, and is the lower surface of the locking portion 43 provided at the other end 42 of the bending bolt 40. After the locking surface 45 formed corresponding to the surface shape of the inner surface 12 is locked to the inner surface 12 of the segment 2, the other end portion 42 of the bending bolt 40 that protrudes from the inner surface 12 through the bending hole 18. After the washer 16 and the nut 17 are inserted into the threaded portion 24 in this order, the nut 17 is fastened and the washer 16 is pressed against the inner surface 12 of the segment 2 and fixed. Thus, the bending bolt 40 is fixed so as not to come out of the bending hole 18 and the segments 2; 2 are joined. The knob 44 includes a constricted portion 46 for hooking a finger. Therefore, when the bending bolt 40 is pulled out and removed from the bending hole 18, the nut 17 is removed from the screw portion 24, and then a person can easily pull the bending bolt 40 from the bending hole 18 by holding the knob 44. , Can facilitate the work. Further, the nut 17 may be fastened only to the threaded portion 24 of the one end 41 of the bending bolt 40, and the fastening work of the nut 17 can be reduced. 5 illustrates the bending bolt 40 in the case of using the washer 16 of FIG. 2, the washer 30 of FIG. 4 may be used, and in this case, the locking portion 43 has the same shape as the shape of the washer 30. What is necessary is just to form.

Other forms
As shown in FIG. 6, a bending bolt 15 as shown in FIG. 2 is used, and a screw portion 24 on one end 23 side of the bending bolt 15 (the longer the length of the screw portion 24 than the bending bolt 15 of FIG. 2). By attaching the detachable screw fastening cap 50 to (preferably), the knob 44 may be formed by the attached screw fastening cap 50. In this way, the bending bolt 15 can be inserted into the bending hole 18 from either of the two end portions 23; 23 of the bending bolt 15, passes through the bending hole 18, and both ends 23; 23 of the bending bolt 15. Since the washer 16, the nut 17 and the screw fastening cap 50 may be attached after protruding from the inner surface 12, workability can be improved. In this case, the washer 16 pressed against the inner surface 12 by the nut 17 on the side to which the screw fastening cap 50 is attached forms a locking portion. In addition, you may use the bending bolt which integrally formed the shape equivalent to the screw fastening cap 50 and the nut 17 in the one edge part 23 side.

  In the above description, the bent bolt joint 6 is used for joining the segments 2; 2 to each other, but the bent bolt joint 6 may be used for joining the segments 2; Further, when the pipe 14 is provided in the bending hole 18, the bending bolt 15; 40 can easily slide in the pipe 14, and the bending bolt 15; 40 can be easily attached and detached. If the 14 is not provided, the cost can be reduced.

The figure which shows the joining method of segments (best form). Sectional drawing of the junction part of the segments by a bending bolt joint (best form). Sectional drawing which shows the construction method of a shield tunnel (best form). Sectional drawing of the junction part of the segments by a bending bolt joint (other form 1). Sectional drawing of the junction part of the segments by a bending bolt joint (other form 2). Sectional drawing of the junction part of the segments by a bending bolt joint (other form 3).

Explanation of symbols

1 shield machine, 2 segments, 11 segment end faces,
12 inner surface of the segment, 13; 18 bent hole, 15; 40 bent bolt,
16 washer, 17 nut (fastening member), 19 curved surface part, 20 pressure receiving surface of washer,
21 bent bolt through hole, 22 opening, 23 end, 24 threaded part,
43 locking part, 44 picking part.

Claims (4)

  In a method for constructing a shield tunnel in which a segment is assembled behind a shield machine to construct a tunnel, a curved hole is formed in the segment on the inner surface and end surface of the segment, and the end surfaces of the two segments are projected. Insert the bending bolts into the bending holes of the two segments that are connected together, and fix the bending bolts with the fastening members so that both ends of the bending bolts protrude from the inner surfaces of the respective segments. A method for constructing a shield tunnel, characterized in that the segments are joined to each other, the fastening of the bent bolt of the joint portion is later released by the fastening member, and the bent bolt is pulled out from the bent hole and removed.   When the end faces of two segments are butted together, a bent hole with openings at both ends continuing to the inner surface of each segment, and a bend with both ends protruding from the openings of the inner surfaces of the two segments inserted into the bent holes Bolts, washers that pass through the ends of the bent bolts and are seated on the inner surface of the segment, and are fastened to the threaded portions of the end of the bent bolts to press the washers against the inner surface of the segment. It is formed with a fastening member that is fixed so as not to come off and joins the segments, and the washer includes a curved surface formed in a shape corresponding to the curved surface of the inner surface of the segment, and a pressure receiving surface that receives pressure from the fastening member 2. The shield tunnel construction method according to claim 1, further comprising a bent bolt through-hole penetrating the curved surface portion and the pressure-receiving surface. That bend bolted joint.   When the end faces of two segments are butted together, a bent hole with openings at both ends continuing to the inner surface of each segment, and a bend with both ends protruding from the openings of the inner surfaces of the two segments inserted into the bent holes Bolts, washers that pass through the ends of the bent bolts and are seated on the inner surface of the segment, and are fastened to the threaded portions of the end of the bent bolts to press the washers against the inner surface of the segment. It is formed with a fastening member that is fixed so as not to come off and joins the segments, and the washer is formed in a columnar shape, and a part or all of one end surface of the columnar tube and a part of the peripheral surface of the columnar tube Is housed in a recess formed in the inner surface of the segment in the vicinity of the opening of the bent hole, and the other end surface of the column cylinder serving as a pressure receiving surface that receives pressure from the fastening member, and one end surface and the other end surface of the column cylinder Bending bolted joints using the method for constructing a shield tunnel according to claim 1, characterized in that a pierced so the bending bolt through hole to connect.   When the end faces of two segments are butted together, a bent hole with openings at both ends continuing to the inner surface of each segment, and a bend with both ends protruding from the openings of the inner surfaces of the two segments inserted into the bent holes Formed by a bolt, a washer that passes through one end of the bending bolt and is seated on the inner surface of the segment, and a fastening member that is fastened to a threaded portion that is formed at one end of the bending bolt. Includes a locking portion and a knob that are larger than the diameter of the opening of the bent hole formed on the inner surface of the segment and are locked to the inner surface of the segment, and fastens the fastening member to the screw portion at one end of the bent bolt. The washer is pressed against the inner surface of the segment and fixed, and the locking part is locked to the inner surface, so that the bending bolt is fixed so that it does not come out of the bending hole, and the segments are joined together. Bending bolted joints using the method for constructing a shield tunnel according to claim 1, characterized in that.

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