JP2008169550A - Widening structure of shield tunnel, shield tunnel segment, and widening method for shield tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily construct an extended tunnel while preventing deformation of the tunnel by providing a new tunnel lining for widening before removing a segment in a cut and extended part without pushing out a segment for widening into the ground by using a special shield machine. <P>SOLUTION: An end part of the segment 8 for widening is fitted into a recessed part 3 for joining the segment for widening formed on outer faces of segments 1a, 1b, 2a, 2b of two parallel shield tunnels 1, 2 and these segments are joined so that the linings 11, 12 for widening are extended between both of shield tunnels and a section between both of shield tunnels is cut and extended up to the linings for widening. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shield tunnel widening structure in which a shield tunnel covering section is enlarged, a shield tunnel segment used in the shield tunnel widening method, and a shield tunnel widening method.

Conventional widening methods include the following methods.
(1) A method of removing a segment of a widened portion and assembling a new segment In this method, when removing a segment, the stability of the entire tunnel is impaired and deformed. Reinforcing work to prevent this will be extensive.
(2) Method of fixing the connecting segment to the shield tunnel segment by welding or the like In this method, it is necessary to greatly expand the periphery of the shield tunnel segment in order to secure a space for welding work.
(3) Method of constructing a frame in the cut and expanded portion with reinforced concrete In this method, the size of the concrete member is increased, the range of cut and expanded excavation is expanded, and costs and work periods are increased.

As a technique for solving these problems, there is a method described in Patent Document 1 (Japanese Patent Laid-Open No. 2006-183352). In this method, widening is performed as follows.
When the upper and lower steel segments are released from the shield tail as the shield machine progresses by excavating the upper and lower partial widened parts with the partial widening cutter of the shield machine, the upper connecting segment pushing device and lower part in the shield machine The connecting segment is pushed into the excavation part widening portion from within the upper and lower steel segments by the extension operation of the hydraulic jack of the connecting segment pushing device.
In the widened section where the lining has been completed in this way, the chemical solution is injected into the upper and lower grounds between the main tunnel and the ramp tunnel from the inside of the lining tunnel.
Next, in the upper and lower chemical solution injection work, an arch-shaped support by long steel pipe fore-pyring is constructed between the connecting segments of the main tunnel and the lamp tunnel.
And, between the main line tunnel and the ramp tunnel, excavated ground between the upper and lower support works.
Next, a steel shell is installed over the connecting segment of the main tunnel and the lamp tunnel, and a concrete placement work is performed in the steel shell.
Thereafter, adjacent segments of the segment ring of the main tunnel and the ramp tunnel are removed, and the main tunnel and the ramp tunnel are made to continue in the lateral direction.

However, with this method, a special shield machine is used to push the connecting segment from the shield tunnel to the ground, so a special machine is required and the cost is high. In addition, since the connecting segment is pushed out, it becomes a problem to ensure the water blocking property of the shield tunnel.
JP 2006-183352 A

  The problem with the present invention is that a special shield machine is not used to push the widening segment to the ground, and a new tunnel lining for widening is installed before removing the widened segment. Thus, it is possible to easily complete an enlarged tunnel while suppressing deformation of the tunnel.

  The present invention of claim 1 is a basic invention for the widening structure of a shield tunnel, and the end of the widened segment is fitted into the widened segment joining recess formed on the outer surface of the shield tunnel segment. By joining, the widening lining by the widening segment is extended from the shield tunnel to the outside, and the shield tunnel is cut and expanded to the widening lining.

  The present invention according to claim 2 relates to a widening structure between two parallel shield tunnels, wherein an end of the widened segment is fitted into a concave portion for joining widened segments formed on an outer surface of a segment of two parallel shield tunnels. By joining these segments, the widening lining by the widening segment is extended between the two shield tunnels, and the space between the two shield tunnels is expanded to the widening lining.

  The invention of claim 3 relates to a widening structure in which the widening lining in the invention of claim 2 is constructed on both the upper and lower sides, and the widening lining by the widening segment is extended on both the upper and lower sides between the two shield tunnels. The space between the linings is widened.

  The invention of claim 4 is characterized in that the widened segment joining recess is formed at the metal segment portion of the segment body constituting the shield tunnel, and the widened segment end portion is formed. The segment main body is joined to the recess.

  The invention of claim 5 is an invention that compensates for the disadvantage of strength due to the formation of the widened segment joining recess, and the thickness of the widened segment joining recess forming portion of the shield tunnel segment is thicker than the other portions. It has become.

  The present invention of claim 6 is an invention relating to a shield tunnel segment that enables the construction of the widening lining as described above, wherein a widening segment joining concave portion is formed on the outer surface of the segment body constituting the shield tunnel, and the concave portion The widened lining by the widened segment can be extended by fitting the end of the widened segment to the segment body and joining it to the segment body.

  The invention of claim 7 is the invention of claim 6, which is intended to stabilize the joining to the end of the widened segment, and the widened segment joining recess is formed in the metal portion of the segment body, Bolt joint holes are provided.

  The invention of claim 8 is an invention that is intended to facilitate the filling of the widening segment joining recesses before the widening lining work, and can be removably attached to the widening segment joining recesses. A filling case is provided, and a filling material is filled in the filling case, so that the widened segment bonding recess can be temporarily filled.

  The present invention of claim 9 is a basic invention of a method for widening a shield tunnel, and after assembling the shield tunnel segment, the end of the widened segment is fitted into the widened segment joining recess formed on the outer surface of the segment. Then, by joining these segments, the widening lining by the widening segment is extended from the shield tunnel to the outside, and the shield tunnel is cut and expanded to the widening lining.

  The present invention of claim 10 relates to a widening method between two parallel shield tunnels, and after assembling the segments of the two parallel shield tunnels, the widened segments are formed in the widened segment joining recesses formed on the outer surfaces of the segments. By joining these segments by joining the ends of the two, a widening lining by a widening segment is extended between both shield tunnels, and the space between both shield tunnels is cut and expanded to a widening lining.

  The invention of claim 11 is an invention intended to maintain stability of both shield tunnels until the widening lining is completed in the invention of claim 10, leaving the earth and sand between the adjacent segments between the shield tunnels. Both the shield tunnels after excavating the widened region between the segments having the widened segment joining recesses of both shield tunnels and extending the widening lining by the widened segments between the widened segment joining concaves of both shield tunnels The segment ring state is maintained, and after the extension of the widening lining is completed, the adjacent segments are removed and the earth and sand between them are removed.

  The invention of claim 12 is an invention intended to protect the concave portion for widening segment joining before the widening lining construction, and temporarily widens the concave portion for widening segment joining with a filling means, and after removing the filling means, the widening The segment joining is performed by fitting the end of the widened segment into the segment joining recess.

  The invention of claim 13 is the invention of claim 12, which is intended to facilitate the filling of the widening segment joining recesses, and a temporary filling case is detachably attached to the widening segment joining recesses, and a filling material therein And the concave portion for widening segment joining is temporarily filled.

  The invention of claim 14 is an invention intended to further improve the workability of the widening lining, and is characterized by aligning the concave portions for widening segment joining in the tunnel axial direction between the segment rings of the shield tunnel. .

  According to the widening structure of the invention of claim 1, widening by the widening segment is achieved by fitting the end of the widening segment to the concave portion for widening segment joining formed on the outer surface of the segment of the shield tunnel and joining these segments. Since the lining is extended from the shield tunnel to the outside, the construction of the widening lining is easy, and the construction cost and the construction period can be reduced as compared with the conventional case. Further, since the widening lining segment and the shield tunnel lining segment can be stably joined, the widening lining and the shield tunnel lining are firmly integrated to form a stable widening structure.

  According to the widening structure of the second aspect of the invention, it is easy to construct a widening lining between two parallel shield tunnels, and the construction cost and the construction period can be reduced as compared with the prior art. Further, since the widening lining segment and the shield tunnel lining segment can be stably joined, both the shielding tunnel lining and the widening lining between them are firmly integrated.

  According to the widening structure of the invention of claim 3, the construction of the upper and lower widening lining between the two shield tunnels in parallel is easy, and the construction cost and the construction period can be reduced as compared with the prior art. In addition, since the upper and lower widening lining segments and the shield tunnel lining segments can be stably joined, both the shield tunnel lining and the upper and lower widening linings between them are firmly integrated, Become.

  According to the widening structure of the fourth aspect of the present invention, since the widened segment joining recess is formed in the metal portion of the segment body constituting the shield tunnel, the joining with the widened segment can be performed firmly.

  According to the widening structure of the fifth aspect of the present invention, since the thickness of the widened segment bonding recess forming portion is thicker than the other portions, the disadvantage of strength caused by forming the widened segment bonding concave portion is simple. Can be compensated for.

  According to the shield tunnel segment of the sixth aspect of the invention, the construction of the widening lining from the shield tunnel is easy, and the construction cost and the construction period can be reduced as compared with the conventional case. Moreover, since it can be stably joined to the segment of the widening lining, a stable widening structure is obtained in which the widening lining and the shield tunnel lining are firmly integrated.

  According to the shield tunnel segment of the seventh aspect of the present invention, the concave portion for widening segment joining is formed in the metal portion of the segment body, and the bolt joint hole is provided in this concave portion. Easy and robust.

  According to the shield tunnel segment of the eighth aspect of the invention, it is possible to easily compensate for the widening segment joining recess before the widening lining work.

  According to the widening method of the ninth aspect of the invention, the construction of the widening lining is easy, and the construction cost and the construction period can be reduced as compared with the conventional method. Further, since the widening lining segment and the shield tunnel lining segment can be stably joined, it is possible to construct a stable widening structure in which the widening lining and the shield tunnel lining are firmly integrated.

  According to the widening method of the invention of claim 10, the construction of the upper and lower widening linings between two parallel shield tunnels is easy, and the construction cost and the construction period can be reduced as compared with the conventional case. In addition, since the upper and lower widening lining segments and the shield tunnel lining segments can be stably joined, the stable widening structure in which both the shield tunnel lining and the upper and lower widening linings are firmly integrated, For example, it is possible to economically construct an approximately elliptical large-section tonnell lining advantageous to external pressure.

  According to the widening method of the invention of claim 11, the segmented state of the two shield tunnels is maintained until the construction of the widening lining is completed, and after completion, the adjacent segments between the two shield tunnels are removed and the soil between them is removed. Therefore, deformation of both shield tunnels can be suppressed and tunnel reinforcement can be omitted.

  According to the widening method of the invention of claim 12, the widening segment joining concave portion of the shield tunnel segment is protected until the widening lining is constructed by temporarily filling the widening segment joining concave portion with the filling means. Can do.

  According to the widening method of the thirteenth aspect of the present invention, it is possible to easily fill and remove the concave portions for widening segment joining.

  According to the widening method of the invention of the fourteenth aspect, the widening segment joining recesses are aligned with each other in the tunnel axis direction between the segment rings of the shield tunnel so that the widening segment joining recesses are formed on the outer surface of the tunnel covering. Since it becomes a groove shape continuously in the direction, when constructing the widening lining, the positional deviation of the segments between the shield tunnels can be absorbed and the widening lining can be closed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

Example 1 is a case where the width between two parallel shield tunnels is widened.
FIG. 1 shows a state in which two single-circular shield tunnels 1 and 2 are arranged in parallel, and the assembly of the respective segments has been completed, and the space between the shield tunnels 1 and 2 is about to be widened.

  Segments 1a, 1b and 2a, 2b having wide segment joining concave portions 3 (hereinafter abbreviated as concave portions 3) on the outer surface are provided in the upper and lower portions of the shield tunnels 1, 2, respectively, instead of ordinary segments. Each of the concave portions 3 is used and is supplemented by a temporary compensation member 4, and the outer surfaces of these segments 1 a, 1 b and 2 a, 2 b are also circumferential surfaces that are continuous with the outer surfaces of the other segments. In these segments 1a, 1b and 2a, 2b, since the recesses 3 are formed on the outer surface, the strength of the recess formation part is weaker than other parts, but it is reinforced by increasing the thickness of the part on the back side. ing.

  The recess 3 itself is substantially triangular in cross section, but the two shield tunnels 1 and 2 have a segment assembly configuration in which the triangles are opposite to each other. In each of the shield tunnels 1 and 2, there is one concave portion 3 for each segment ring in the upper portion and the lower portion, and the upper concave portion 3 is continuous in the tunnel axis direction between the segment rings. Thus, a groove having a triangular cross section is formed, and the lower concave portion 3 also has a groove having a triangular cross section continuously in the tunnel axis direction between the segment rings. In addition, the cross-sectional shape of the recessed part 3 is not restricted to a triangle.

  In FIG. 2, the upper and lower portions between the shield tunnels 1 and 2 are excavated for widening, and the upper excavation space 5 and the lower excavation space 6 are formed. The recesses 3 of the segments 1a and 2a open into the upper excavation space 5, and the recesses 3 of the lower segments 1b and 2b open into the lower excavation space 6. The ceiling portion 5a of the upper excavation space 5 and the bottom portion 6b of the lower excavation space 6 are ground improved by chemical injection or the like. The ceiling portion 6a is reinforced by sheet pile installation or shotcrete, but the earth and sand 7 between the upper and lower reinforcing portions, that is, the adjacent segments of the shield tunnels 1 and 2 (segments without the recess 3). The sand 7 between them remains.

  FIG. 3 shows a construction example in which the upper widening lining is constructed from both shield tunnels 1 and 2 in the upper excavation space 5. For each of the upper segments 1a and 2a of the shield tunnels 1 and 2, the end of the widening segment 8 for widening lining is fitted into the concave portion 3, and the widening segment 8 is attached to each segment 1a and 2a. After joining using bolts, the other widened segments 9 are sequentially added and joined.

  Finally, as shown in FIG. 4, the wedge 10 is inserted between the two adjacent widened segments 9 to close the entire widened segment, thereby completing the arch-shaped upper widened lining.

  Also in the lower excavation space 6 in FIG. 2, after the widened segment 8 is joined to the lower segments 1b and 2b in the same manner, the other widened segments 9 are sequentially added and joined to complete the lower widened lining.

  After constructing the upper widening lining and the lower widening lining in this way, each shield tunnel 1, 2 has a segment 1 c between the upper and lower segments 1 a, 1 b having the recess 3, and also the recess 3. When the segment 2c between the upper and lower segments 2a and 2b is removed and the earth and sand 7 remaining between them is removed, as shown in FIG. 5, both shield tunnels 1 and 2 have an upper widening cover 11 and a lower portion. A substantially elliptical large-section tornell lining, in which the lining section is enlarged by the widening lining 12, is completed.

  In constructing the upper widening lining 11 and the lower widening lining 12, the widening segments 8 and 9 are staggered in the tunnel axial direction as shown in the development view of FIG. 2 is formed in a continuous groove shape in the tunnel axis direction as described above, the position of the segment rings 1d and 2d is shifted in the tunnel axis direction between the shield tunnels 1 and 2 as shown in FIG. However, when the segments 1a, 1b and 2a, 2b having the recesses 3 and the widened segment 8 are joined, it can be easily coped with by adjusting the position of the hole (drilling position) for the bolt to be joined.

  Next, specific examples of the segments 1a, 1b and 2a, 2b having the recesses 3 will be described with one of the segments 2a as a representative.

  As shown in FIG. 7, the segment 2a is a so-called synthetic segment in which the entire steel segment or the hollow portion of the steel segment body is filled with concrete, and the recess 3 has a triangular section in the steel portion. It is formed on the outer surface of the segment 2a as if lacking. The bottom surface of the recess 3 is left behind, leaving both side portions 3a, and communicates with the opening 13 on the inner surface side of the segment 2a.

  In order to make up for the recess 3, a temporary filling case 14 made of metal (for example, made of steel) having an open upper surface is prepared. The temporary compensation case 14 has a box shape that matches the recess 3 and can be detachably fitted into the recess 3 as shown in FIG. 8. The bolt hole 15 provided in the temporary compensation case 14 is a bolt hole 16 on the recess 3 side. It is designed to stop with bolts (not shown). Thereafter, as shown in FIG. 9, the temporary filling case 14 is filled with a filler 17 such as concrete. The filled material becomes the temporary filling member 4 to temporarily fill the concave portion 3.

  When ready to construct the widening lining as shown in FIG. 2, the temporary filling member 4 is removed as shown in FIG. 10 to open the recess 3, and the widening segment 8 as shown in FIGS. The end portion 8a is fitted into the recess 3, and the fitting portion is fastened with a bolt to join the widened segment 8 to the segment 2a. At that time, the opening 13 on the inner surface side of the segment 2a serves as a work opening for bolt joining. The end portion 8 a of the widened segment 8 is partially thickened on the inner surface side of the widened segment 8 in order to match the recess 3.

  The segments 1a, 1b and 2b other than the segment 2a also have the same structure as the segment 2a as a specific example.

  FIG. 13 and FIG. 14 show the junction relationship in the tunnel axis direction with the widened segment 8 when the segments 1 a, 1 b and 2 a, 2 b having the recesses 3 have such a structure.

  When the segments are assembled in the tunnel axis direction in each of the shield tunnels 1 and 2, since the recesses 3 are assembled in alignment, the recesses 3 are continuous in a groove shape in the tunnel axis direction. When the widened segments 8 and 9 are assembled and joined between the corresponding segment rings of both shield tunnels 1 and 2, if the segment rings are displaced in the tunnel axial direction between the shield tunnels 1 and 2, the one side In the shield tunnel (shield tunnel 2 in the illustrated example), the end 8a of the widened segment 8 can be precisely aligned with the recess 3 in the tunnel axis direction. In the example of the shield tunnel 1), as shown in an enlarged view in FIG. 14, the end 8a of the widened segment 8 is displaced from the corresponding recess 3 and partially fits into the adjacent recess 3 as well.

  However, even if the end 8a of the widened segment 8 is displaced from the corresponding recess 3 and thus fits, it can be joined without any trouble by opening a hole for bolt joining according to the displacement. it can.

  In the segments 1a, 1b and 2a, 2b having the concave portion 3, the strength of the concave portion forming portion is weaker than that of the other portions. Therefore, in the above embodiment, the portion is reinforced by increasing the thickness on the back side. As shown in FIG. 15, you may reinforce by preparing the reinforcement piece 18 and attaching this to the back side of a recessed part formation part.

Example 2 is a case where, for example, an emergency parking zone is constructed by widening the side of one shield tunnel.
As shown in FIG. 16 (A), segments 1a and 1b having recesses 3 at two upper and lower portions of one shield tunnel 1 are used, and an outer widened region 19 between them is excavated to form these segments 1a and 1b. As shown in FIG. 16 (B), the widened segment 8 is joined, and another widened segment 9 is joined to construct a widening cover, and then unnecessary segments between the segments 1a and 1b are removed.

  In contrast, conventionally, after excavating the outer widened region 20 of the shield tunnel 1 as shown in FIG. 17 (A), a reinforced concrete frame 21 was constructed as shown in FIG. 17 (B). According to Example 2 shown in FIG. 16, the emergency parking zone can be easily, economically and safely constructed.

1 is a cross-sectional view of two shield tunnels showing Embodiment 1 of the present invention that widens between two shield tunnels in parallel. FIG. In Example 1, it is sectional drawing of the state which excavated the upper part and lower part between both shield tunnels. In Example 1, it is sectional drawing of the state which joins a widening segment within upper excavation space. It is sectional drawing of the state which similarly closes a widening segment. In Example 1, it is sectional drawing of the state in which both shield tunnels expanded the covering cross section by the upper widening lining and the lower widening lining, and the substantially elliptical large-section tornell lining was completed. It is an expanded view which contrasts the assembly form of a widening segment with a tunnel lining cross section. It is a perspective view which shows the concrete structural example of the segment which has the recessed part for widened segment joining with a temporary compensation case. It is a perspective view of the state which made the temporary compensation case fit in the wide segment joining recessed part. It is a perspective view of the state which filled the temporary filling case with the filler. It is a perspective view of the state which removed the temporary filling member which filled the temporary filling case with the filler. It is a perspective view of the state where a wide segment is joined to a segment which has a concave part for wide segment joining. It is a perspective view after joining a widening segment. It is a perspective view which shows the joining relationship of the tunnel axis direction of the segment which has the recessed part for wide segment joining, and the wide segment. It is the one part expansion perspective view. BRIEF DESCRIPTION OF THE DRAWINGS It is the simplified figure which shows the example which reinforces the recessed part formation part of the segment which has a recessed part for widened segment joining with a reinforcement piece, (A) is the state before attaching a reinforcement piece, (B) is the state after attaching. It is the schematic which shows Example 2 which widens the side of one shield tunnel, (A) is the state before construction of a widening lining, (B) is the state after construction. It is a simplified diagram which shows the prior art example compared with Example 2, (A) is the state before construction of the widening body, and (B) is the state after construction of the body.

Explanation of symbols

1 and 2 Shield tunnel 1d and 2d Segment ring 3 Widening segment joint recess 1a, 1b, 2a and 2b Segment 4 Temporary filling member 5 Upper excavation space 5a Ceiling part 5b Bottom part 6 Lower excavation space 6a Ceiling part 6b Bottom part 7 Earth and sand 8 Widening Segment 8a End 9 Widening segment 10 Wedge 11 Upper widening lining 12 Lower widening lining 13 Opening 14 Temporary filling case 15/16 Bolt hole 17 Filler 18 Reinforcing piece

Claims (14)

  The widening lining by the widening segment is extended from the shield tunnel to the outside by fitting the end of the widening segment to the recess for widening segment joining formed on the outer surface of the shield tunnel segment. The widening structure of the shield tunnel, wherein the shield tunnel is cut and expanded to the widening lining.   Widening lining by widening segments between the two shield tunnels by fitting the ends of the widening segments into the recesses for widening segment joining formed on the outer surfaces of two parallel shield tunnel segments. A widening structure of a shield tunnel, characterized in that is extended and the space between both shield tunnels is widened to a widening lining.   The widening structure of the shield tunnel according to claim 2, wherein widening lining by the widening segment is extended on both upper and lower sides between both shield tunnels, and the upper and lower widening linings are cut and widened.   2. A widening segment joining recess is formed in a metal portion of a segment body constituting a shield tunnel, and an end of the widening segment is fitted into the recess and joined to the segment body. The widened structure of the shield tunnel according to any one of 3 above.   5. The shield tunnel widening structure according to any one of claims 1 to 4, wherein a thickness of a widening segment bonding recess forming portion of the segment of the shield tunnel is thicker than other portions.   A widened segment joint recess is formed on the outer surface of the segment body that constitutes the shield tunnel, and the widened lining by the widened segment is extended by fitting the end of the widened segment into this recess and joining the segment body. A shield tunnel segment characterized by being able to do so.   7. The shield tunnel segment according to claim 6, wherein a widened segment joining recess is formed in a metal portion of the segment body, and a bolt joining hole is provided in the recess.   A provisional filling case that can be detachably attached to the widening segment joining concave portion, and the widening segment joining concave portion can be temporarily filled by filling the case with a filler. The shield tunnel segment according to 7.   After assembling the shield tunnel segment, the end of the widened segment is fitted to the concave part for widened segment bonding formed on the outer surface of the segment, and these segments are joined together, so that the widening lining by the widened segment is removed from the shield tunnel. A method for widening a shield tunnel, wherein the shield tunnel is extended to the outside and the shield tunnel is cut and expanded to the widening lining.   After assembling the segments of two parallel shield tunnels, the end of the widened segment is fitted into the widened segment joint recess formed on the outer surface of these segments, and these segments are joined to widen the two shield tunnels. A method for widening a shield tunnel, characterized by extending a widening lining by a segment and cutting the space between both shield tunnels to a widening lining.   After excavating the widened area between the segments having the widened segment joint recesses of both shield tunnels, leaving the soil between the adjacent segments between the two shield tunnels, widening between the widened segment joint concave portions of both shield tunnels Until the extension lining by the segment is extended, the segment ring state of both shield tunnels is maintained, and after the extension lining extension is completed, the adjacent segments are removed and the sand between them is removed. The method for widening a shield tunnel according to claim 10.   The widened segment joining recess is temporarily filled with a filling means, and after removing the filling means, the end of the widened segment is fitted into the widened segment joining recess to perform segment joining. The method for widening a shield tunnel according to any one of 9 to 11.   13. The method for widening a shield tunnel according to claim 12, wherein a temporary filling case is detachably attached to the widening segment joining concave portion, and a filling material is filled therein to temporarily fill the widening segment joining concave portion.   14. The method for widening a shield tunnel according to any one of claims 9 to 13, wherein, in the segment rings of the shield tunnel, the recesses for widening segment joining are aligned in the tunnel axis direction.

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