JP4445540B2 - Approach and road tunnel shield and approach tunnel, road tunnel construction method - Google Patents

Description

  The present invention relates to a construction method in which a main part of an approach shield for excavation of an approach tunnel is diverted to a shield for a road tunnel and an approach tunnel or a road tunnel is constructed using the shield.

  When a road tunnel is installed underground, there are sections that enter the underground from the ground and are connected to the underground main section, and conversely, sections that exit from the underground main section to the ground. It is called (approach part), the shield that excavates that part is called the approach shield, and the tunnel is called the approach tunnel.

  The main section, which is a road tunnel, is often constructed by a shield method, and in order to suppress the impact of land subsidence due to excavation, it is common to ensure that the thickness of the top cover of the tunnel is greater than the tunnel diameter. On the other hand, the approach section is shallower than the main section, where the earth covering is constructed with a diameter greater than the tunnel diameter, and the approach area is relatively shallow from the ground surface. In combination, an underground tunnel was constructed by the excavation method.

  When building a road tunnel with the conventional shield method, the start shaft must be 1.5 to 2.0 times the shield outer diameter of the road tunnel because of the stability of the face and the rise. The approach part from the ground to the vertical shaft usually used the open-cut method.

However, when this approach part is performed by the open-cut method and the approach part 5 ′ is constructed, as shown in FIG. 17 (a), when there are many buried objects 3 ′, river beds 4 ′, and structures 2 ′ near the ground surface, In the open-cut method, it was necessary to remove, switch and relocate them, which had a great impact on the surrounding residents. Also, as shown in FIG. 17 (b), the groundwater vein b 'is blocked by the earth retaining a' of the open-cut method, and the ground springs and wells are depleted. . Conventionally, the approach portion 5 ′ uses an open-cut method, and the shield starting shaft 1 ′ uses a newly manufactured shield for a road tunnel to dig up to a reaching shaft.
JP200221098

  The present invention has been proposed in view of the above, and the object of the invention is to minimize the approach portion by the open-cut method, so that even if there are riverbeds, structures, etc. on the ground surface, they will not be adversely affected. In order to reduce the impact on the ground, the height of the tunnel cross section of the approach part is made as low as possible to make it a horizontally long elliptical or horizontally long arc-shaped rectangular tunnel cross section. Approach tunnel / road tunnel shield and approach tunnel to main line road tunnel that can be easily changed to circular, horseshoe-shaped, reverse horseshoe-shaped cross-section etc. that can secure a space such as ventilation space, evacuation passage, joint groove etc. It is in providing the construction method over to.

In Claim 1, a horizontally long approach shield can be replaced with a circular, horseshoe-shaped, or reverse horseshoe-shaped road tunnel shield, and the approach shield includes a remaining part to be left in the approach tunnel and an upper or lower part. A removable part that can be removed, and a diverted part that is diverted to a road tunnel shield, and a newly produced road tunnel shield is assembled to the diverted part and is replaced with a road tunnel shield.
According to a second aspect of the present invention, in the approach / road tunnel shield according to the first aspect, the approach shield has a horizontally long arc-shaped rectangular shape, and is provided so as to be divided into a substantially central portion of the shield and the upper and lower portions thereof. This approach shield is assembled on the upper and lower parts of the shield central conversion part, and the newly manufactured part on the circular shield having a substantially half-moon shape and the new part under the circular shield. Depending on the production part, it is converted into a circular shield for building a road tunnel.
3. The approach / road tunnel shield according to claim 1, wherein the approach shield has a horizontally long arc-shaped rectangular shape, and a rectangular shield provided on the upper rectangular shield and a lower portion of the rectangular shield can be divided below. The approach shield is composed of a diverted portion, and is replaced with a horseshoe-shaped shield for constructing a road tunnel by a newly manufactured portion on a substantially half-moon-shaped horseshoe-shaped shield assembled to the rectangular shield diverted portion.
According to claim 4, in the approach and road tunnel according to claim 1, the approach shield has a reverse horseshoe shape, and an upper horseshoe-shaped shield upper removal part having an arcuate shape with a small curvature on the upper part, and a lower part of the approach shield can be divided. This approach shield is replaced with a circular shield that builds a road tunnel by a newly manufactured part on a substantially semicircular circular shield that is assembled to the upper part of the reverse horseshoe shield transfer part. It is characterized by.
According to claim 5, in the approach and tunnel shield according to claim 1, the approach shield has a substantially rectangular shape, and the upper and lower portions of the outer shell are formed of a rectangular shield diversion portion, and the approach shield is diverted to the rectangular shield. It is characterized in that it is replaced with a circular shield for constructing a road tunnel by a newly manufactured part on a substantially half-moon-shaped circular shield assembled respectively above and below the part, and a newly manufactured part under the circular shield.
In the approach and road tunnel shield according to any one of claims 1 to 5, the diversion portion includes an outer shell diverted to the road tunnel shield, a partition wall provided in the outer shell, and the partition wall. It consists of a cutter provided in front of and a cutter driving device for driving the cutter.
According to a seventh aspect of the present invention, in the approach / road tunnel shield according to any one of the first to sixth aspects, the approach shield and the road tunnel shield are formed of an eccentric multiaxial shield.
According to an eighth aspect of the present invention, in the approach / road tunnel shield according to the fifth aspect, the approach shield and the cutter of the road tunnel are made of a rotary cutter.
In claim 9, the approach tunnel is constructed by starting a horizontally long approach shield from the shield start shaft, and a road tunnel shield is replaced by diverting a part of the approach shield in the shield replacement shaft or shield replacement underground space, A road tunnel is constructed by this road tunnel shield.
The approach tunnel and road tunnel construction method according to claim 9, wherein the approach shield includes a remaining portion left in the approach tunnel, an upper portion or a lower portion, a removable portion that can be removed, and a road tunnel. A diverted portion that is diverted to a shield, a road tunnel shield newly manufactured portion is assembled to the removed portion, and the shape is changed from a horizontally long shape to a circular, horseshoe-shaped or reverse horseshoe-shaped road tunnel shield.

Since the approach tunnel is constructed with a rectangular oblong shield that has the same width and a lower height than a circular shield, it is possible to start from a shallow part, and the excavation of the approach part is minimal, earth retaining and excavation are also minimal As far as the limit is concerned, the impact on the surroundings and ground improvement are also minimal.
Further, in the conversion from the rectangular shield to the circular shield, it is economical because various facilities such as the cutter driving unit, a part of the cutter, and the earth removing device can be diverted.
Furthermore, when there are buried objects or river crossings in the construction section of the approach tunnel, the rectangular shield has the effect of being easily separated from the river bed.

  Embodiments of the present invention will be described below with reference to the drawings.

  1A to 1C are conceptual diagrams of the present invention. FIG. 1B is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 1C is a cross-sectional view taken along line BB in FIG.

  In FIG. 1A, 1 is a shield start shaft, 2 is a structure on the ground part, 3 is a buried object near the ground, 4 is a river bed, 5 is an approach between the shield start shaft 1 and the shield replacement shaft 6 A tunnel 7 is an excavation section that connects the shield start shaft 1 and the ground portion, and 8 is a road tunnel from the shield replacement shaft to, for example, an arrival side shaft (not shown).

  In FIG. 1, “a” is the earth covering from the ground to the upper part of the road tunnel 8.

  In the basic embodiment of the present invention, as shown in FIG. 1 (b), the approach tunnel 5 is formed in a tunnel shape having a horizontally long tunnel cross section and a generally elliptical or horizontally long arc-shaped rectangular tunnel. As shown in FIG. 1C, the tunnel 8 is characterized in that it is constructed as a tunnel shape having a substantially circular cross section.

  FIG. 2 is an enlarged view of an example of a cross section of the approach tunnel 5 shown in FIG. In the figure, 9 is a segment constituting a tunnel incorporated in a horizontally long arc-shaped rectangle, 10 is an invert in the lower part of the tunnel, 11 is a ventilation space, 12 is a sign installation space, 13 is a building limit, and 14 is a supervisor passage. .

FIG. 3 is an enlarged view of an example of a cross section of the road tunnel 8 shown in FIG. 15 is a circular segment, 16 is an invert, 17 is a floor slab provided on the invert 16, 18 is an inner wall provided between the floor slab 17 and the invert 16, 19 is an evacuation passage defined by the inner wall 18, 20 is a common groove, 21 is a building limit, 22 is a sign installation space, 23 is a ventilation space, and 24 is a supervisor passage.

  FIG. 4 shows another example of the tunnel construction shown in FIG. In this example, the shield replacement shaft 6 in FIG. 1 is a shield replacement underground space 6A, and the shield replacement work from the approach shield to the shield for the road tunnel is performed here. In the figure, 25 is a ground improvement portion provided in the ground, 26 is an underground structure, and 27 is an excavation space. Others are the same as FIG.

  FIG. 5 shows the construction of the road tunnel 8 from the approach tunnel 5 in the example of FIG. 1, and the second approach tunnel 5 having a horizontally long arc-shaped rectangle is formed again through the second shield replacement shaft 6 ′. This is an example. Reference numeral 28 denotes a shield reaching shaft. In this example, a part of the circular shield is dismantled in the second shield replacement shaft 6 ', and the necessary members among the remaining members such as the removal of the approach shield used for the construction of the first approach tunnel are reused. The approach shield is assembled to construct an approach tunnel, thereby reducing costs, shortening the construction period, and the like.

  FIG. 6A is a front view of an approach shield composed of a so-called eccentric multiaxial shield, FIG. 6B is a side sectional view, and FIG. 6C is an enlarged explanatory view of the lower part of the side portion of the approach shield outer shell. Show.

  When viewed from the front, this approach shield has a horizontally long arc-shaped rectangular shield, and this rectangular tunnel 29 for the approach tunnel includes an outer shell 30 formed of a shield tube having an arc-shaped rectangle, and an inside of the outer shell 30. And a cutter 32 driven by a so-called parallel link motion by a drive rotating body 31 having an eccentric drive shaft 31a indicated by an imaginary line, and adopting an eccentric multi-axis shield structure in the present invention, By changing the shape of the outer shell 30, a cross section having an arbitrary shape can be easily excavated.

  The cutter 32 is provided in front of a partition wall 33 provided in the front of the outer shell 30, a large number of cutter bits 34 are provided on the entire surface, and the cutter 32 is a horizontally long shape substantially corresponding to the shape of the outer shell 30. It is composed of a ring-shaped outer cutter frame 32a having an arcuate rectangular shape, and cutter spokes 32b assembled in a lattice shape provided inside the cutter frame 32a, and an outer end portion of the cutter spoke 32b is It is connected to the inner periphery of the cutter frame 32a. The cutter 32 is formed by connecting rod-shaped steel materials having appropriate lengths using bolts, nuts, and, if necessary, fixing means such as welding. Similarly, the outer shell 30 is formed by integrating plate members. Therefore, it can be divided at a desired portion by removing bolts, nuts and the like.

  The configuration and operation of the eccentric multi-axis shield itself are already well known in this kind of technical field. In the present invention, as described above, the approach tunnel 5 is constructed by a horizontally long rectangular shield made of an eccentric multi-axis shield, and the road tunnel 8 is formed by a rectangular shield cutter drive device 31A, a cutter 32, and a part of the outer shell 30. Assemble a shield of the same width by sharing it with a circular shield, and build a road tunnel with this shield. By sharing the main part, it is possible to simplify the assembly of the shield, reduce costs, and thus shorten the construction period. I have to.

  That is, the rectangular shield 29 is not necessary for the shield central transfer portion 35 shared with the circular shield for the road tunnel, the outer shell remaining portion 36 that is not required after the construction of the approach tunnel, and the circular shield for the road tunnel. A rectangular shield upper removal portion 37 and a rectangular shield lower removal portion 38, a rectangular cutter 32 in which an upper portion and a lower portion are divided and removed. In FIG. 6A, C is a cutter upper parting line, 32a 'is a cutter upper removal part, C' is a cutter lower parting line, and 32c is a cutter lower part.

  The shield center diversion part 35 which is the shield main part includes a shield outer diversion part 30a on both sides of the outer shell 30, a cutter central diversion part 32 'substantially surrounded by virtual lines b and b' shown above and below, The cutter driving device 31A (see FIG. 6B) provided in a frame surrounded by imaginary lines b and b ′ is used.

  As shown in FIG. 6B, the outer shell remaining portion 36 is an outer shell remaining portion behind the outer shell 30 that is left in the approach tunnel.

  The rectangular shield upper removal portion 37 to be divided includes a rectangular shield upper shell removal portion 30b, a rectangular shield partition upper portion 33a, a cutter upper removal portion 32a ', and the like.

  The rectangular shield lower removal portion 38 includes a rectangular shield lower outer shell removal portion 30c, a rectangular shield partition lower portion 33b, a cutter lower removal portion 32c, and the like.

  The rectangular shield partition lower part 33b is provided with at least one screw conveyor structure earth removing device 33B.

  FIG. 6C shows a rectangular shield partition diversion portion 33 ′ and a rectangular shield lower outer shell removal portion 30c of the outer shell 30 shown in FIG. It is an enlarged view of the rectangular shield partition lower part 33b part, d shows an outer shell lower part dividing line, and e shows a partition lower part dividing line.

  In this embodiment, the shield outer shell diversion portion 30a, which is the side portion of the outer shell 30 of the rectangular shield 29, is diverted, but all may be left or removed without diversion. In this case, all outer shells of the circular shield are newly manufactured.

  FIG. 6B is a side sectional view of the rectangular shield 29.

  29A is a shield remaining portion, 31A is a cutter driving device provided behind the partition wall 33, 41 is a stirring blade provided on the back of the cutter 32, 42 is a reaction force receiver, 43 is a shield jack, and 44 is for segment assembly. The erector 45 is a discharge port of the earth removing device 33B, b "is a partition upper parting line, f is an outer shell upper parting line, e is a partition lower parting line, and d is an outer shell lower parting line.

  When excavating the face, each cutter driving device 31A of the rectangular shield 29 configured as described above is driven in synchronization with the same direction, and the cutter 32 is moved in a parallel link to perform excavation work.

  7A is a front view of a circular shield which is a road tunnel shield, FIG. 7B is a sectional side view, and FIG. An enlarged explanatory view of a newly manufactured part under the circular shield to be incorporated is shown. 53f is a partition triangular portion, and this portion is also newly manufactured.

  The circular shield 50 is also an eccentric multi-axis shield, and is partially diverted from the rectangular shield 29, and a substantially circular cross section is excavated by a circular cutter 51 having the same width as the rectangular shield 29.

  The circular shield 50 can be broadly divided into a shield center diverting part 35 that is a diversion of the main part of the rectangular shield 29, a shield center newly producing part 35A (see FIG. 7B), a circular shield newly producing part 52, and a circular shield below. It is composed of four blocks of a new production part 53.

  The shield center diversion portion 35 is diverted from the rectangular shield 29, and the shield outer shell diversion portion 30a, the shield partition diversion portion 33 ′, the cutter central diversion portion 32 ′, and the shield central portion cutter driving rotation on both sides of the shield outer shell 30. It consists of a body 31, a cutter driving device 31A and the like.

  As shown in FIG. 7B, the shield center newly manufactured portion 35A is a circular shield center outer shell newly manufactured portion.

  The newly manufactured circular shield upper part 52 includes a circular shield upper outer shell newly manufactured part 52a, a circular shield partition upper part 52b, a circular cutter upper part 52c, a shield upper cutter driving part 52d, and the like. The upper cutter driving unit 52d is composed of a driving rotator or a cutter driving device having the eccentric shaft described in the rectangular shield 29.

  The newly manufactured portion 53 under the circular shield comprises a newly manufactured circular shield lower outer shell portion 53a, a circular shield partition lower portion 53b, a circular cutter lower portion 53c, a shield lower cutter drive portion 53d, and the like. 53e is provided.

  Above and below the shield central transfer portion 35, a newly manufactured portion 52 above the circular shield, a newly manufactured portion 53 below the circular shield, and the like are assembled and integrated through fixing means such as bolts, nuts, and welds. 50 is configured.

  In FIG. 7A, h and h ′ are the cutter upper and lower joint lines, i and i ′ are the partition upper and lower joint lines, respectively, and the imaginary line in FIG. 6A is between i and i ′. It almost corresponds to the frame of b and b ′.

  In FIG. 7B, j and j 'are the outer shell upper and lower joint lines. It corresponds to the partition upper and lower joint lines i and i '.

  In FIG. 7B, 54 is an erector for incorporating a segment of a circular tunnel, 55 is a jack for excavation, and 56 is a spreader.

  Next, the construction method of the approach tunnel 5 and the road tunnel 8 using the shield according to the first embodiment of the present invention will be described with reference to FIG. 1, FIG. 8 (a), (b) to FIG. 13 (a), (b), etc. It explains along.

  First, as shown in FIG. 1, a shield start shaft 1 and a shield replacement shaft 6 are constructed.

  In addition, the excavation section 7 which is an approach portion and is as short as possible is constructed by the excavation method. This excavation section 7 may be almost simultaneously with the approach tunnel 5 or before or after construction, and the construction procedure is appropriately selected.

  When the shield start shaft 1 is constructed, the rectangular shield 29 is started from the shield start shaft 1 toward the shield replacement shaft 6 to construct the approach tunnel 5.

  That is, the cutter 32 that performs the parallel link motion is driven to excavate the face, and the rectangular shield 29 is excavated while excavating earth and sand through the excavator 33B, and the approach tunnel 5 is constructed by assembling the segments along with the excavation. To do.

  When the rectangular shield 29 reaches the shield replacement shaft 6 as shown in FIG. 1, the cutter upper removal portion 32 a ′ is removed from the rectangular cutter 32. 8 (a) and 8 (b) show a state where the shield replacement shaft 6 is reached. FIGS. 9A and 9B show a removed state of the cutter upper removal portion 32a 'shown in FIG. 6A. The cutter upper removal part 32a 'and the rectangular shield upper removal part 37 may be divided and transported according to the weight.

  Next, the under-cutter removal part 32c is removed from the cutter 32, etc., the rectangular under-shield removal part 38 is removed, and the shield center diversion part 35 is left.

  The shield remaining portion 29A shown in FIG. 6B is left in the approach tunnel 5 in the same manner as the conventional shield method. In addition, what is necessary is just to divide and carry the shield center diversion part 35 for every cutter drive device 31A. Moreover, what is necessary is just to divide | segment and convey the cutter lower removal part 32c and the rectangular shield lower removal part 38 according to a weight.

  Next, as shown in FIGS. 10 (a) and 10 (b), since it becomes an obstacle to the replacement work to the circular shield in the shield replacement shaft 6, the shield central conversion portion 35 is lifted by the wire W, Secure the necessary space. In FIGS. 8A and 8B to FIGS. 10A and 10B, G is a gantry.

  Next, as shown in FIGS. 11A and 11B, the newly manufactured portion 53 under the circular shield is set on the gantry G. After that, in order to integrate with this, the shield center diversion part 35 once lifted is suspended via the wire W, and the shield partition diversion part is under the circular shield as shown in FIGS. 12 (a) and 12 (b). The upper part of the circular shield partition lower part 53b (see FIG. 7A) of the newly manufactured part 53, the lower part of the diverted part of the cutter 32 shown in FIG. 6A is the upper end of the circular cutter lower part 53c, and the shield central diverted part The lower part of the shield shell transfer portion 30a on both sides of the outer shell 35 is integrated with the upper part of the newly manufactured circular shield lower shell 53a by bolts, nuts, welding, etc., respectively. Moreover, the shield center new production part 35A is connected.

  Next, the newly manufactured portion 52 on the circular shield is suspended through the wire W, and is assembled and connected and integrated into the shield central transfer portion 35 in substantially the same manner as the lower portion.

  In this way, the respective parts are integrated, and as shown in FIG. 7B, the circular shield erector 54, the shield jack 55, the circular shield earthing device 53e, etc. are attached, and the assembly of the circular shield 50 is completed. As shown in FIG. 13A, the temporary support 63 is assembled, the circular shield 50 is dug, and the circular segment 15 is dug by an assembly number ring from a predetermined position. Thereafter, the circular shield 50 is advanced.

  FIGS. 14A and 14B show a second embodiment of an approach shield and a road tunnel shield used in the present invention.

  In this embodiment, when the natural ground is relatively good and the evacuation passage 19, the common groove 20 and the like (see FIG. 3) are not required in the entire tunnel, the approach tunnel is excavated and constructed by the rectangular shield 70, and the road tunnel is rectangular. The main feature of the shield is that it is excavated by a horseshoe shield 80 formed by diverting it.

  The rectangular shield 70 is basically configured in the same manner as that shown in FIGS. 6A and 6B, is composed of an eccentric multiaxial shield, and is horizontally long as shown in FIG. 14A. An outer shell 71 having an arcuate rectangular shape, and a cutter 72 having a parallel link motion in the outer shell 71 and provided with a number of cutter bits at the front, a rectangular shield diverting portion 70A, and a rectangular shield at the upper portion thereof It consists of the upper removal part 70B.

  The outer shell 71 is an outer shell diverting portion 71b from the upper divided position 71a to the lower portion on both sides of the upper curved portion on both sides, and a substantially half-moon upper outer shell removing portion which is divided and removed from the upper divided position 71a to the upper portion. 71c.

  A cutter 72 driven by a cutter driving device including an eccentric shaft 72e, a driving rotator 72f, and the like includes a ring-shaped cutter frame 72a having a substantially rectangular shape, and a grid-shaped cutter spoke 72b provided on the inside thereof. Thus, the outer shape of the cutter 72 has a shape substantially corresponding to the shape of the outer shell 71, and is composed of a cutter diverting portion 72c having a shape smaller than and substantially corresponding to the outer shell diverting portion 71b, and an upper cutter removing portion 72d. .

  The partition wall 73 in the outer shell 71 also includes a partition wall transfer portion 73a having substantially the same shape as the outer shell transfer portion 71b and the cutter transfer portion 72c, and an upper partition wall removal portion 73b.

  In FIG. 14A, the portion below the imaginary line k is a rectangular shield diversion portion 70A. 1 is a cutter upper parting line, imaginary line k is a partition upper parting line, and 71a is an outer shell upper parting line.

  In addition, at least one or more earth removing devices 74 are provided below the partition wall 73, and the earth removing devices 74 are also diverted.

  The cutter drive mechanism that performs the parallel link motion of the rectangular shield 70 and other configurations are basically the same as those of the rectangular shield 29 of the first embodiment.

  The horseshoe shield 80 of this embodiment shown in FIG. 14B is configured by assembling a newly manufactured portion 81 on the horseshoe shield attached to the upper portion of the rectangular shield diverting portion 70A by fixing means such as bolts and nuts.

  The front shape of the newly manufactured portion 81 on the horseshoe-shaped shield is formed in a substantially half-moon shape with a part of a circle cut out and slightly protruding upward, and is combined with the rectangular shield diverting portion 70A to form a horseshoe shape as a whole.

  The newly produced portion 81 on the horseshoe-shaped shield is a newly produced portion 81d on the cutter having an arc-shaped upper and outer shell newly produced portion 81a, a cutter 81c having a cutter bit 81b located on the inner side, and a partition wall. An upper newly manufactured portion 81e and a cutter driving device for driving the cutter 81c are provided. 81f is an eccentric shaft of the cutter driving device, and 81h is a rotating body for driving.

  The rear part of the newly produced part 81d on the cutter is connected to the drive mechanism. The cutter 81c is composed of an arcuate cutter frame 81c1 and a lattice-like cutter spoke 81c2 positioned inside the cutter frame 81c1, and the lower part of the cutter frame 81c1 and the lower part of the cutter spoke 81c2 are integrated with the rectangular shield cutter transfer part. And make a parallel link motion. In FIG. 14B, l is a cutter upper joint line.

  That is, the lower part of the horseshoe-shaped shield upper outer shell newly manufactured portion 81 a is integrated at the upper divided position of the upper portion of the rectangular shield diversion portion 70 A of the rectangular shield 70. In FIG. 14B, l 'is the cutter upper joint line, k' is the partition upper joint line, and 71a 'is the outer shell upper joint line.

  At the time of construction, the approach tunnel 5 is constructed with the rectangular shield 70, the rectangular shield upper removed portion 70B is removed with the replacement shaft 6, and the newly produced portion 81 on the horseshoe shield is assembled to the horseshoe shield 80 which is a road tunnel shield. Replace it. In the present embodiment, a part of the outline of the rectangular shield 70 is diverted, but the entire outer shell may be left or removed without diverting the outer shell. In that case, the drive part of the horseshoe-shaped shield 80 is diverted, and the outer shell is entirely manufactured.

  The cross section of the road tunnel 8 has a horseshoe shape, and the shape of the bottom portion does not require an evacuation passage or a common groove, so that it has an arc shape with a small curvature, and the upper portion has an arc shape with a large curvature.

  15 (a) and 15 (b) show a third embodiment of the shield according to the present invention.

  This embodiment is characterized in that the approach shield is a reverse horseshoe shield 90 and the shield for the road tunnel is a circular shield 100.

  This embodiment is suitable for use in the case where the evacuation passage 19 and the common groove 20 shown in FIG. That is, the approach shield has a reverse horseshoe shape, the lower part has an arc shape with a large curvature, and the lower side is inflated to secure a space, so that the evacuation passage 19 and the like (see FIG. 3) can be built inside, and earth pressure / The strength can be increased against the water pressure.

  In addition, since the upper portion has an arc shape with a small curvature, this embodiment can cope with a shallow earth covering.

  The horizontally long reverse horseshoe shield 90 includes a reverse horseshoe shield diverting part 90A and a reverse horseshoe shield upper removal part 90B. The outer shell 91 has an arc shape with a large curvature, and an outer shell diverting portion 91a whose both sides have an arc shape and an arc shape with a small curvature that can be freely attached to and detached from the upper portion, and is divided and removed. It consists of an outer shell removal portion 91b, and the inner partition wall 92 is also constituted by a partition transfer portion 92a and an upper partition wall removal portion 92b.

  The overall shape is a reverse horseshoe shape, a cutter bit 93c is provided at the front, and the cutter 93 consisting of a reverse horseshoe-shaped cutter frame 93d and cutter spokes 93e is also divided into a cutter diversion portion 93a and a cutter diversion portion 93a and removed. The cutter removal portion 93b.

  The cutter 93 performs a parallel link motion by a cutter driving device including an eccentric shaft 94a, a driving rotating body 94b, and the like.

  In the figure, m is the cutter upper parting line, n is the partition upper parting line, and o is the outer shell upper parting line. Each member is divided by removing bolts, nuts and the like.

  Note that at least one or more earth removing devices 95 are provided at the lower center of the partition wall 92.

  The circular shield 100 includes a reverse horseshoe-shaped shield diverting portion 90A that is divided and reused, and a newly manufactured portion 100A on a substantially crescent-shaped circular shield that has a shape obtained by cutting a part of a circle incorporated in the upper portion thereof.

  The newly manufactured portion 100A on the circular shield includes an arc-shaped upper outer shell newly manufactured portion 101, and a cutter upper newly manufactured portion 102 which is positioned inside and incorporated with the cutter diversion portion 93a of the reverse horseshoe shield 90.

  The newly manufactured part 102 on the cutter is connected to a plurality of eccentric multi-axis drive parts, and includes an arc-shaped cutter frame 102a and a grid-shaped cutter spoke 102b provided on the inside thereof.

  The newly manufactured part 101 on the cutter is driven by a cutter driving device including an eccentric shaft 103a, a driving rotating body 103b, and the like.

  The newly manufactured portion 100A on the circular shield is integrated with the reverse horseshoe-shaped shield diverting portion 90A via bolts, nuts, etc., and the circular shield 100 is formed as a whole.

  m 'is the cutter upper joint line, n' is the partition upper joint line, and o 'is the outer shell upper joint line.

  In construction, first, the approach tunnel 5 is constructed with the reverse horseshoe shield 90, the reverse horseshoe shield upper removal portion 90 </ b> B is removed at the replacement shaft 6, and the newly manufactured portion 100 </ b> A on the circular shield is assembled and replaced with the circular shield 100. . In this embodiment, the outer shell 91 of the reverse horseshoe shield 90 is partially diverted, but the outer shell 91 may not be diverted but may be left or removed. In that case, the outer shell of the circular shield 100 is newly manufactured.

  FIGS. 16A and 16B show a fourth embodiment of an approach shield made of a rectangular shield and a shield for a road tunnel made of a circular shield according to the present invention.

  The rectangular shield 110 simply removes the upper and lower parts of the outer shell 111, and the other main part becomes a rectangular shield diverting part 110A. In addition, the cutter driving method is characterized in that a rotational driving method is adopted.

  That is, the laterally long rectangular outer shell 111 is formed by a side portion of the outer shell having a small curvature with both sides forming a part of a substantially circular shape, and a substantially straight outer shell upper portion provided on the upper and lower sides thereof. It consists of a rectangular shield outer shell lower part, and the outer shell upper part and lower part become the outer shell removal part 111a, and the outer shell side part becomes the outer shell diversion part 111b.

  The outer shell side portion and the upper and lower portions of the outer shell are divided at the portion of the outer shell dividing line p, and the upper and lower outer shell removal portions 111a are divided and removed or left.

  The cutter 113 of the rectangular shield 110 is a rotary type. The cutters 113 are respectively provided on the left and right when viewed from the front. Each of the pair of cutters 113 is provided with a rotation shaft 113b having a center cutter 113a at the front portion at the center and centering on the rotation shaft 113b. A fan-shaped cutter 114 having a spoke structure is provided between the tip portions of the cutter spokes 113c. The X-shaped cutter spoke 113c extends in the radial direction.

  An extra digging cutter 113d is provided at one tip of one of the spokes 113c of the pair of X-shaped cutter spokes 113c.

  The fan-shaped cutter 114 includes an arc-shaped spoke 114a that connects the tip portions of the pair of X-shaped cutter spokes 113c, a substantially linear spoke 114b that is provided on the inner side of the arc-shaped spoke 114a, and There are reinforcing spokes 114c that connect the spokes 114b and the arc-shaped spokes 114a, and a number of cutter bits 115 are provided in front of the X-shaped cutter spokes 113c and the fan-shaped cutter 114.

  The pair of X-shaped cutter spokes 113c are arranged so as not to collide with each other when rotated, and the rotation speed is also adjusted, and they are rotated in the same direction by a known rotation mechanism, and substantially correspond to the horizontally long rectangular outer shell 111. It is configured to excavate a shaped horizontal shaft.

  In addition, at least one or more earth removing devices 116 are provided below the partition 112 of the rectangular shield 110, and the excavated earth and sand by the cutter 113 is earthed. When this earth removing device 116 is a circular shield, it is removed from this position, and the opening of the partition 112 after the removal is closed. The earth removing device 116 may be diverted to a circular shield.

  The circular shield 120 includes a rectangular shield diverting portion 110A, a newly manufactured portion 120A on the circular shield, and a newly manufactured portion 120B below the circular shield, respectively.

  The newly manufactured portion 120A on the circular shield is composed of an arc-shaped upper outer shell 121, an approximately half-moon upper partition wall 122 provided in the upper outer shell 121, a plurality of rotatable cutters 123, and a jet nozzle 124. It is configured.

  The cutter 123 corresponds to a space, and the length of the cutter spoke is adjusted so that an unexcavated portion is not generated as much as possible. A jet nozzle 124 is provided at an appropriate position in a portion that cannot be excavated by the cutter 123.

  The newly manufactured portion 120B under the circular shield is configured in the same manner, and is provided with a cutter 123 and a jet nozzle 124, and at least one or more soil removal devices 116 are provided at appropriate positions in the lower portion.

  In the construction, first, the rectangular shield 29 is started from the shield start shaft 1, the approach tunnel 5 is built, and when the shield replacement shaft 6 is reached, the upper and lower outer shell portions and the like are removed and left.

  Next, a newly manufactured portion 120A above the circular shield and a newly manufactured portion 120B below the circular shield are assembled and integrated on the upper and lower sides of the rectangular shield diverting portion 110A by fixing means such as bolts, nuts, and welding.

  Then, the road tunnel 8 may be constructed by starting from the shield replacement shaft 6.

  In addition, in the construction methods of the first to fourth embodiments, when the shield replacement shaft 6 is the shield replacement underground space 6A shown in FIG.

  Further, as shown in FIG. 5, when it is desired to construct an approach tunnel again from a road tunnel shield, the second shield replacement shaft 6 'may be replaced with an approach shield.

(A) is a conceptual diagram of an example of the manufacturing method of this invention, (b) is the sectional view on the AA line in (a), (c) is sectional drawing on the BB line in (a). It is sectional drawing of an example of the approach tunnel which concerns on this invention. It is sectional drawing of an example of the road tunnel which concerns on this invention. The conceptual diagram of the other example of the construction method of this invention is shown. The conceptual diagram of the further another example of the construction method of this invention is shown. (A) is a front view of 1st Example of the rectangular shield which concerns on the approach shield of this invention, (b) is a sectional side view, (c) shows the elements on larger scale. (A) is a front view of 1st Example of the circular shield which concerns on the shield for road tunnels of this invention, (b) is a sectional side view, (c) shows the elements on larger scale. (A), (b) shows the side view and front view of a process which divide | segment a rectangular shield. (A), (b) shows the side view and front view of the following division | segmentation process. (A), (b) shows the side view and front view of a further division | segmentation process further. It is explanatory drawing of the process of assembling | attaching a newly manufactured part under a circular shield to the shield center conversion part of the divided | segmented rectangular shield, Comprising: (a) is side explanatory drawing, (b) shows front explanatory drawing. It is explanatory drawing of the process of assembling a newly manufactured part on a circular shield to the shield center diversion part, (a) is side explanatory drawing, (b) shows front explanatory drawing. (A) is side explanatory drawing of the start state of the completed circular shield, (b) shows the front explanatory drawing. (A) is a front view of 2nd Example of the rectangular shield which concerns on the approach shield of this invention, (b) shows the front view of 2nd Example of the shield for road tunnels which consists of a horseshoe-shaped shield. (A) The front view of 3rd Example of the reverse horseshoe-shaped shield which concerns on the approach shield of this invention is shown, (b) The front view of 3rd Example of the shield for road tunnels which consists of a circular shield is shown. (A) is a front view of the fourth embodiment of the rectangular shield according to the approach shield of the present invention, (b) is a front view of the circular shield of the fourth embodiment according to the shield for road tunnel. (A), (b), (c) shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shield start shaft 2 Ground structure 3 Underground structure 4 River bed 5 Approach tunnel 6, 6 'Shield replacement shaft 7 Opening section 8 Road tunnel 9 Segment 10 Invert 11 Ventilation space 12 Sign installation space 13 Construction limit 14 Monitor passage DESCRIPTION OF SYMBOLS 15 Circular segment 16 Invert 17 Floor slab 18 Middle wall 19 Evacuation passage 20 Joint groove 21 Construction limit 22 Sign installation space 23 Ventilation space 24 Surveillance passage 25 Ground improvement part 26 Underground structure 27 Excavation space 28 Shield reach shaft 29 Rectangular Shield 29A Shield remaining part 30, 30 'Outer shell 30a Shield outer shell diversion part 30b Upper outer shell removal part 30c Shield lower outer shell removal part 31 Rotating body for driving 31A Cutter drive device 31a Eccentric drive shaft 32 Cutter 32' For cutter central rotation Part 32a Cutter -Frame 32a 'Cutter upper removal part 32b Cutter spoke 32c Cutter lower removal part 33 Bulkhead 33' Rectangular shield bulkhead diversion part 33a Rectangular shield bulkhead upper part 33b Rectangular shield bulkhead lower part 33B Earth removal device 34 Cutter bit 35 Shield central diversion part 35A New shield center Production part 36 Remaining part of outer shell 37 Removal part above rectangular shield 38 Removal part below rectangular shield 41 Stirrer blade 42 Reaction force receiver 43 Shield jack 44 Elector 45 Drain outlet 50 Circular shield 51 Circular cutter 52 New production part 52a circular on circular shield Shield upper outer shell newly manufactured part 52b Circular shield partition upper part 52c Circular cutter upper part 52d Shield upper cutter driving part 53 Circular shield lower newly manufactured part 53a Circular shield lower outer shell newly manufactured Part 53b Circular shield partition lower part 53c Circular cutter lower part 53d Shield lower cutter drive part 53e Earth removal device 53f Bulkhead triangular part 54 Elector 55 Jack 56 Spreader 57 Temporary support work 58 Horseshoe shield 59 Horseshoe shield new production part 63 Temporary support work 70 Rectangle Shield 70A Rectangular shield diversion portion 70B Rectangular shield upper removal portion 71 Outer shell 71a Outer shell upper parting line 71b Outer shell diversion portion 71c Upper outer shell removal portion 72 Cutter 72a Cutter frame 72b Cutter spoke 72c Cutter diversion portion 72d Cutter removal portion 72e Eccentricity Shaft 72f Rotating body for driving 73 Bulkhead 73a Partition transfer portion 73b Partition removal portion 74 Earth removal device 80 Horseshoe shield 81 Newly manufactured portion on horseshoe shield 81a Horseshoe sea 81b Cutter bit 81c Cutter 81c1 Cutter frame 81c2 Cutter spoke 81d Newly produced part on cutter 81e Newly produced part on partition 81f Eccentric shaft 81h Rotating body for driving 90 Reverse horseshoe shield 90A Reverse horseshoe shield diverting part 90B Reverse Horseshoe shield upper removal part 91 Outer shell 91a Outer shell conversion part 91b Upper outer shell removal part 92 Bulkhead 92a Bulkhead transfer part 92b Upper bulkhead removal part 93 Cutter 93a Cutter diversion part 93b Cutter removal part 93c Cutter bit 93d Cutter frame 93e Cutter spoke 94a Eccentric shaft 94b Rotating body for driving 95 Earth removal device 100 Circular shield 100A New production part on the circular shield 101 New production part on the upper outer shell 102 New production part on the cutter 02a Cutter frame 102b Cutter spoke 103a Eccentric shaft 103b Rotating body for driving 110 Rectangular shield 110A Rectangular shield diversion part 111 Outer shell 111a Outer shell removal part 111b Outer shell diversion part 112 Bulkhead 113 Cutter 113a Center cutter 113b Rotating shaft 113c X-shaped cutter Spoke 113d Excavation cutter 114 Fan-shaped cutter 114a Arc-shaped spoke 114b Spoke 114c Reinforcement spoke 115 Cutter bit 116 Earth removal device 120 Circular shield 120A Newly manufactured part above circular shield 120B Newly manufactured part below circular shield 121 Upper outer shell 122 Upper partition wall 123 Cutter 124 Jet nozzle

Claims (10)

A shield that can replace a horizontally oriented approach shield into a circular, horseshoe-shaped, or reverse horseshoe-shaped road tunnel shield,
The approach shield includes a remaining portion to be left in the approach tunnel, an upper or lower portion that can be removed, and a diverted portion that is diverted to a road tunnel shield, and the diverted portion includes a road tunnel shield. Assemble the new production part and replace it with a road tunnel shield.
An approach and road tunnel shield characterized by that. In the approach and road tunnel shield according to claim 1,
The approach shield has a horizontally long arc-shaped rectangular shape, and is composed of a shield central diversion portion at a substantially central portion, a rectangular shield upper removal portion that can be divided into upper and lower portions, a rectangular shield lower removal portion,
This approach shield is replaced with a circular shield for constructing a road tunnel by a newly manufactured part on the circular shield having a substantially half-moon shape and a newly manufactured part under the circular shield, which are assembled to the upper part and the lower part of the central part of the shield. ,
An approach and road tunnel shield characterized by that. In the approach and road tunnel shield according to claim 1,
The approach shield has a horizontally long arc-shaped rectangular shape, and is composed of an upper rectangular shield removal part and a rectangular shield diversion part provided so as to be divided below the upper part,
This approach shield is replaced with a horseshoe shield that builds a road tunnel by a newly manufactured part on a substantially half-moon shaped horseshoe shield assembled to the rectangular shield diversion part,
An approach and road tunnel shield characterized by that. In the approach and road tunnel according to claim 1,
The approach shield has a reverse horseshoe shape, and an upper horseshoe-shaped shield upper removal part having an arcuate shape with a small curvature, and a reverse horseshoe-shaped shield diversion part provided so as to be dividable below.
This approach shield is replaced with a circular shield that builds a road tunnel by a newly manufactured portion on a substantially half-moon-shaped circular shield that is assembled on the upper part of the inverted horseshoe-shaped shield conversion portion.
An approach and road tunnel shield characterized by that. The approach and tunnel shield according to claim 1,
The approach shield is almost rectangular, and consists of a rectangular shield diversion part where the upper and lower parts of the outer shell can be removed,
This approach shield is replaced with a circular shield that builds a road tunnel by a newly manufactured part on a substantially semicircular circular shield that is assembled above and below the rectangular shield diverted part, and a newly manufactured part under the circular shield,
This is an approach and road tunnel. In the approach and road tunnel shield according to any one of claims 1 to 5,
The diversion part consists of an outer shell diverted to a road tunnel shield, a partition provided in the outer shell, a cutter provided in front of the partition, and a cutter driving device for driving the cutter.
An approach and road tunnel shield characterized by that. In the approach and road tunnel shield according to any one of claims 1 to 6,
The approach shield and the road tunnel shield comprise an eccentric multi-axis shield,
An approach and road tunnel shield characterized by that. In the approach and road tunnel shield according to claim 5,
The approach shield and the road tunnel cutter comprise a rotary cutter,
An approach and road tunnel shield characterized by that. A horizontal approach shield is started from the shield start shaft, and an approach tunnel is constructed, and a part of the approach shield is diverted in the shield replacement shaft or shield replacement underground space to replace the road tunnel shield. Build a road tunnel,
An approach tunnel and a road tunnel construction method characterized by the above. In the approach tunnel and road tunnel construction method according to claim 9,
The approach shield includes a remaining part left in the approach tunnel, an upper or lower part that can be removed, and a diverted part that is diverted to a road tunnel shield, and the road tunnel shield is newly manufactured in the removed part. The parts are assembled and converted from a horizontally long shape to a circular, horseshoe-shaped or reverse horseshoe-shaped road tunnel shield.
An approach tunnel and a road tunnel construction method characterized by the above.

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