JP2021113456A - Segment pipe structure, connecting rings constituting the same, and assembly method of segment pipe structure - Google Patents

Abstract

To ensure water stoppage at a connecting ring installed between a steel segment pipe and a concrete segment pipe.SOLUTION: A connecting ring CR between a steel segment tube STS and a RC segment tube STC has pieces PMA, PMB, PMB, PMC and a rescue piece PR. The rescue piece PR is provided to fill a gap when the pieces PMA, PMB, PMB, and PMC are arranged so that the connection ring CR becomes a perfect circle, whereby the water stoppage of the connection ring CR can be ensured. Further, a joint between the pieces PMA, PMB, PMB, and PMC and a joint between the pieces PMB, PMC and the rescue piece PR are fitting joints. As a result, in the connection ring CR, water blocking members WS1 and WS2 can be arranged so as to make a continuous circumference along the circumferential direction of the connection ring CR between a facing surface of a steel segment pipe STS and the connection ring CR and a facing surface of a RC segment pipe STC and the connection ring CR, and water stoppage can be ensured with the connection ring CR.SELECTED DRAWING: Figure 3

Description

The present invention relates to a segment pipe structure, a connecting ring constituting the segment pipe structure, and a method for assembling the segment pipe structure, and is effective when applied to, for example, a segment pipe structure having a steel segment pipe and a concrete segment pipe. It's about technology.

The shield method is a method of constructing a tunnel by forming an excavation hole by excavating the ground with an excavator and assembling a lining member called a segment pipe on the inner wall surface of the excavation hole. The segment pipe generally includes a steel segment pipe made of steel and a concrete segment pipe made of concrete and a steel material (reinforcing bar or the like).

Steel segment pipes are used for sharply curved parts in tunnels because they can tolerate some strain, but they may not be formed in a perfect circle due to the influence of strain. On the other hand, if the concrete segment pipe is not assembled in a perfect circle, cracks and chips will occur due to the uneven stress. Therefore, when assembling the concrete segment pipe after the steel segment pipe in one tunnel, , A connecting ring for forming a perfect circle called a ruler ring is interposed between the steel segment pipe and the concrete segment pipe (for example, Patent Documents 1 and 2).

Japanese Unexamined Patent Publication No. 2014-51839 Japanese Unexamined Patent Publication No. 2014-51840

By the way, when the diameter of the tunnel becomes large, the connection ring becomes heavy, and it becomes difficult to carry the tunnel into the excavation hole if the ring shape is maintained. Therefore, it is conceivable that the connecting ring is divided into a plurality of pieces and carried into the excavation hole, and the plurality of pieces are reassembled into a perfect circular connection ring in the excavation hole as close to a perfect circle as possible. However, when trying to assemble multiple pieces into a perfect circular connecting ring, the last piece cannot be installed due to the arrangement between the pieces, or there is a gap between the last piece and the adjacent piece. In either case, there is a problem in terms of water stopping at the connecting ring portion.

The present invention has been made from the above-mentioned technical background, and in a segment pipe structure having a steel segment pipe, a concrete segment pipe, and a connecting ring arranged between them, the connecting ring is used. It is an object of the present invention to provide a technology capable of ensuring the water-stopping property of concrete.

In order to solve the above problems, the segment pipe structure of the present invention according to claim 1 is a steel segment pipe assembled by arranging a plurality of steel segments in an annular shape along the inner circumference of the excavation hole. And a concrete segment pipe that is arranged after the steel segment pipe in the excavation direction of the excavation hole and is assembled by arranging a plurality of concrete segments in an annular shape along the inner circumference of the excavation hole. , The steel segment pipe and the concrete segment pipe are arranged in a state of being connected to each of the steel segment pipe and the concrete segment pipe, and are formed in an annular shape along the inner circumference of the excavation hole. The connection ring comprises a plurality of types of main pieces arranged in a state of being joined to each other so as to form a perfect circle along the inner circumference of the excavation hole, and the plurality of types of the connection ring. It is characterized by including a sub-piece arranged in a state of being joined to the main piece in order to fill a gap generated in a part when the main piece is arranged so as to be a perfect circle.

The segment pipe structure of the present invention according to claim 2 is characterized in that, in the invention according to claim 1, the plurality of types of main pieces is four or more.

The segment pipe structure of the present invention according to claim 3 is provided in the excavator for excavating the excavation hole in each of the plurality of types of main pieces in the invention according to claim 1 or 2. It is characterized in that a gripped portion is provided so that it can be gripped by an erector.

The segment tube structure of the present invention according to claim 4 has the shape and true shape of the connecting ring in each of the plurality of types of main pieces in the invention according to any one of claims 1 to 3. It is characterized in that a mark for confirming the deviation from the circle is provided.

In the invention according to any one of claims 1 to 4, the segment pipe structure of the present invention according to claim 5 is formed in a recess formed in one of the plurality of types of main pieces in the other. The convex portions are joined to each other by being joined together, and the main piece and the subpiece are joined to each other by joining the convex portions formed on the other side to the concave portion formed on one side. It is characterized by that.

The segment pipe structure of the present invention according to claim 6 is the first in the invention according to any one of claims 1 to 5, between the connecting ring and the facing surface of the steel segment pipe. It is characterized in that the water blocking member 1 is provided, and the second water stopping member is provided between the connecting ring and the facing surface of the concrete segment pipe.

The segment pipe structure of the present invention according to claim 7 is the segment pipe of the steel segment pipe, the concrete segment pipe, or both of them in the invention according to any one of claims 1 to 6. Hexagonal segments are provided at least in part.

The connection ring of the present invention according to claim 8 has a steel segment pipe assembled by arranging a plurality of steel segments in an annular shape along the inner circumference of the excavation hole and a steel segment pipe in the excavation direction of the excavation hole. The steel segment pipe and the steel segment pipe and the concrete segment pipe assembled by arranging a plurality of concrete segments in an annular shape along the inner circumference of the excavation hole arranged after the steel segment pipe. A plurality of types of main pieces installed in a state of being connected to each of the concrete segment pipes and arranged in a state of being joined to each other so as to form a perfect circle along the inner circumference of the excavation hole, and the plurality of types. It is characterized by including a sub-piece arranged in a state of being joined to the main piece in order to fill a gap generated in a part when the main pieces of each type are arranged in a perfect circle shape.

The connecting ring of the present invention according to claim 9 is characterized in that, in the invention according to claim 8, the plurality of types of main pieces is four or more.

The connecting ring of the present invention according to claim 10 is an excavator provided in an excavator for excavating the excavation hole in each of the plurality of types of main pieces in the invention according to claim 8 or 9. It is characterized in that a gripped portion is provided so as to be grippable.

The connection ring of the present invention according to claim 11 is the invention according to any one of claims 8 to 10, wherein each of the plurality of types of main pieces has the shape of the connection ring and a perfect circle. It is characterized in that a mark for confirming the deviation is provided.

The connecting ring of the present invention according to claim 12 is the invention according to any one of claims 8 to 11, wherein the plurality of types of main pieces are formed in a recess formed on one side and on the other side. The protrusions are joined to each other by being joined together, and the main piece and the subpiece are joined to each other by joining the concave portion formed on one side with the convex portion formed on the other side. It is a feature.

The connecting ring of the present invention according to claim 13 is the first in the invention according to any one of claims 8 to 12 between the connecting ring and the facing surface of the steel segment pipe. A water stop member is provided, and a second water stop member is provided between the connecting ring and the facing surface of the concrete segment pipe.

The method for assembling the segment pipe structure of the present invention according to claim 14 is to assemble a steel segment pipe by arranging a plurality of steel segments in an annular shape along the inner circumference of an excavation hole excavated by an excavator. A step of installing a connecting ring formed in an annular shape along the inner circumference of the excavation hole in a state of being joined to the steel segment pipe after the steel segment pipe, and a step of installing the connecting ring. The latter stage has a step of assembling the concrete segment pipe in a state of being joined to the connecting ring by arranging a plurality of concrete segments in an annular shape along the excavation hole, and an installation step of the connecting ring. Is a step of drilling a first hole for joining the steel segment pipe and the connecting ring on the tip surface of the steel segment pipe in the excavation hole, and the steel segment pipe in the excavation hole. A step of drilling a second hole for joining the steel segment pipe and the concrete segment pipe to the tip surface of the segment pipe via the connecting ring, and the steel segment pipe in the drilling hole. When a step of transporting a plurality of types of main pieces and a plurality of types of subpieces constituting the connection ring and the plurality of types of main pieces are arranged so that the connection ring becomes a perfect circle on the tip surface side of the In order to fill a gap that occurs in a part of the steel, a suitable subpiece is selected from the plurality of types of subpieces and joined to one end in the circumferential direction of the last subpiece to be arranged last among the plurality of types of main pieces. On the tip surface of the steel segment pipe, a plurality of main pieces other than the last main piece are arranged in order so that the connecting ring has a perfect circle shape, and each of them is passed through the first hole. After joining to the steel segment pipe, the last main piece to which the optimum subpiece is joined is placed on the tip surface of the steel segment pipe and joined to the steel segment pipe through the first hole. The step of assembling the concrete segment pipe is characterized by having a step of joining the concrete segment pipe and the steel segment pipe through the second hole through the connecting ring. do.

The method for assembling the segment pipe structure of the present invention according to claim 15 is that in the invention according to claim 14, the drilling step of the first hole and the second hole is described in the drilling hole. A step of marking the tip surface of the steel segment pipe with a first mark for drilling the first hole and a second mark for drilling the second hole by a ruler, and the steel product. The step of drilling the first hole at the position of the first mark on the tip surface of the segment pipe and the second hole at the position of the second mark on the tip surface of the steel segment pipe. The main piece joining step includes aligning the third hole formed in the main piece with the first hole drilled in the steel segment pipe, and the main piece. After aligning the fourth hole drilled in the piece with the second hole drilled in the steel segment pipe, the third hole in the main piece and the first hole in the steel segment pipe are aligned. It is characterized by having a step of joining the main piece and the steel segment pipe by inserting the first fastening member into the hole of.

The method for assembling the segment pipe structure of the present invention according to claim 16 is characterized in that, in the invention according to claim 14 or 15, the plurality of types of main pieces is four or more.

The method for assembling the segment pipe structure of the present invention according to claim 17 is the method according to any one of claims 14 to 16, wherein in the step of installing the connection ring, the plurality of types of main pieces are assembled. Each is characterized by being installed by the excavator's elector.

The method for assembling the segment pipe structure of the present invention according to claim 18 is the invention according to any one of claims 14 to 17, wherein the connection ring installation step is made of the connection ring and the steel. By a process of bringing the water-stopping members installed in advance to the segment pipe into contact with each other and joining them, and by combining the plurality of types of main pieces with the concave portion formed on one side and the convex portion formed on the other side. A step of joining each other, a step of joining the main piece and the subpiece to each other by joining a concave portion formed on one side with a convex portion formed on the other side, and a connecting ring and the concrete segment pipe. It is characterized by having a step of installing a second water blocking member along the circumferential direction of the connecting ring between the facing surfaces of the connecting ring.

The method for assembling the segment pipe structure of the present invention according to claim 19 is the method for assembling the concrete segment pipe after the step of installing the connection ring in the invention according to any one of claims 14 to 18. Before the step, it is characterized by having a step of confirming the deviation between the shape of the connecting ring and the perfect circle by the marks formed on each of the plurality of types of main pieces.

The method for assembling the segment pipe structure of the present invention according to claim 20 is the method for assembling the segment pipe structure of the present invention according to any one of claims 14 to 19, wherein the steel segment pipe, the concrete segment pipe, or both of them. A hexagonal segment is provided in at least a part of the segment tube.

According to the present invention, in a segment pipe structure having a steel segment pipe, a concrete segment pipe, and a connecting ring arranged between them, it is possible to ensure water stoppage at the connecting ring. ..

(A) is a side view of the segment pipe according to the embodiment of the present invention, and (b) is a front view of the segment pipe of FIG. 1 (a) as viewed from the direction of arrow A1. (A) and (b) are cross-sectional views of a main part of a connecting portion of a steel segment pipe, a concrete segment pipe, and a connecting ring constituting the segment pipe of FIG. FIG. 5 is a plan view of the connecting ring of FIG. 1 on the facing surface side of the steel segment pipe. (A) is an enlarged plan view of a main part of the region E1 surrounded by a broken line of the connection ring of FIG. 3, and (b) is a side view of the main part of the connection ring seen from the direction of arrow A3 of FIG. 4 (a). ) Is a cross-sectional view taken along line I-I in FIG. 4 (a), (d) is an enlarged cross-sectional view of the bolt hole in FIG. 4 (c), and (e) is a cross-sectional view taken along line II-II in FIG. 4 (a). Is. (A) is an enlarged plan view of a main part of the region E2 surrounded by a broken line of the connection ring of FIG. 3, and (b) is a side view of the main part of the connection ring seen from the direction of arrow A4 of FIG. 5 (a). ) Is a sectional view taken along line III-III of FIG. 5 (a), (d) is an enlarged sectional view of the bolt hole on the left side of FIG. 5 (c), and (e) is an enlarged sectional view of the bolt hole on the right side of FIG. It is an enlarged sectional view. (A) is a plan view showing the rescue piece extracted, (b) is a sectional view taken along line IV-IV of FIG. 6, and (c) is a sectional view taken along line VV of FIG. It is a block diagram which saw through the inside of the shield excavator used in one Embodiment of this invention from the side. (A) to (c) are cross-sectional views of a main part of the ground showing a process of assembling a segment pipe while digging an excavation hole in the ground by a shield excavator. (A) is a front view of a steel segment pipe assembled in a drilling hole, (b) is a cross-sectional view of the VI-VI line of FIG. 9 (a), and (c) is a VII-VII of FIG. 9 (a). It is sectional drawing of a line. (A) is a front view of a steel segment pipe assembled in a drilling hole in a step after FIG. 9, (b) is a cross-sectional view of the VI-VI line of FIG. 10 (a), and FIG. 10 (c) is FIG. It is sectional drawing of the VII-VII line of (a). (A) is a front view of a steel segment pipe assembled in a drill hole in a process after FIG. 10, (b) is a cross-sectional view of the VI-VI line of FIG. 11 (a), and (c) is FIG. It is sectional drawing of the VII-VII line of (a). (A) is a front view of a steel segment pipe assembled in a drill hole in a process after FIG. 11, (b) is a cross-sectional view of the VI-VI line of FIG. 12 (a), and (c) is FIG. It is sectional drawing of the VII-VII line of (a). (A) is a front view of a steel segment pipe assembled in a drilling hole in a process after FIG. 12, (b) is a cross-sectional view of the VI-VI line of FIG. 13 (a), and (c) is FIG. It is sectional drawing of the VII-VII line of (a). (A) is a front view of a steel segment pipe assembled in a drill hole in a process after FIG. 13, (b) is a cross-sectional view of the VI-VI line of FIG. 14 (a), and (c) is FIG. It is sectional drawing of the VII-VII line of (a). (A) is a front view of a steel segment pipe assembled in a drill hole in a process after FIG. 14, (b) is a cross-sectional view of the VI-VI line of FIG. 15 (a), and (c) is FIG. It is sectional drawing of the VII-VII line of (a). (A) is a front view of a steel segment pipe assembled in a drill hole in a process after FIG. 15, (b) is a cross-sectional view of the VI-VI line of FIG. 16 (a), and (c) is FIG. It is sectional drawing of the VII-VII line of (a). It is a side view of the segment pipe of the 2nd Embodiment.

Hereinafter, embodiments as an example of the present invention will be described in detail with reference to the drawings. In addition, in the drawing for demonstrating the embodiment, the same constituent elements are in principle given the same reference numerals, and the repeated description thereof will be omitted.

(First Embodiment)

FIG. 1A is a side view of the segment pipe according to the embodiment of the present invention, and FIG. 1B is a front view of the segment pipe of FIG. 1A as viewed from the direction of arrow A1. .. The arrow A2 in FIG. 1A indicates the assembly direction (ground excavation direction) of the segment pipe ST.

As shown in FIG. 1A, the segment pipe (segment pipe structure) ST of the present embodiment includes a steel segment pipe STS, an RC (Reinforced Concrete) segment pipe (concrete segment pipe) STC, and the like. It is equipped with a connection ring CR provided between the two.

In the steel segment pipe STS, for example, a plurality of rectangular steel segment SSs in a plan view are arranged along the circumferential direction of the tunnel to form an annular unit segment pipe, and the unit segment pipe is tunneled. It is configured to be arranged in succession along the axial direction of (the direction of arrow A2).

The steel segment SS is composed of steel as the main material, and is excellent in, for example, homogeneity, weldability, and light weight. The steel segment pipe STS formed by combining a plurality of the steel segment SSs is mainly arranged in a sharp curve portion of the tunnel or a portion where an opening is provided in a part thereof from the viewpoint of allowing a certain amount of distortion. ..

In the RC segment pipe STC, for example, a plurality of RC segment SCs having a rectangular shape in a plan view are arranged along the circumferential direction of the tunnel to form an annular unit segment pipe, and the unit segment pipe is used as the axis of the tunnel. It is composed of a plurality of consecutive arrangements along the direction.

The RC segment SC is composed of a combination of tensile-resistant reinforcing bars and compression-resistant concrete, and is excellent in, for example, durability, compression resistance, watertightness, and high rigidity. The RC segment pipe STC configured by combining a plurality of RC segment SCs is mainly arranged in a straight portion of a tunnel. As shown in FIG. 1 (b), the RC segment tube STC is assembled in a perfect circle when viewed from the front.

The connecting ring CR is installed between the steel segment pipe STS and the RC segment pipe STC in contact with both of these segment pipes. As described above, the steel segment pipe STS can tolerate some strain, but may not be assembled in a perfect circle. However, if the RC segment tube STC is not assembled in a perfect circle, damage (applying, cracking, peeling, etc.) may occur due to uneven stress. Further, if there is a step on the surface of the steel segment pipe that contacts the RC segment pipe after assembling the steel segment pipe STS, the RC segment pipe STC is generated during thrust transmission during shield excavation due to the step. May be damaged (scratched, cracked, peeled, etc.).

From these points of view, when shifting from the steel segment pipe STS to the RC segment pipe STC, the RC segment pipe STC should be a perfect circle and the facing surface of the RC segment pipe should be smooth in the steel segment pipe STS. It is necessary to configure it so that it becomes.

The connection ring CR is a perfect circular smooth joint plate for forming the RC segment pipe STC into a perfect circle in a front view and eliminating a step on the end face of the steel segment pipe STS. That is, the RC segment pipe STC can be formed in a perfect circle by providing the connecting ring CR as described above between the steel segment pipe STS and the RC segment pipe STC in the subsequent stage. Further, it is possible to eliminate the step on the end face of the steel segment pipe STS. Therefore, it is possible to suppress or prevent damage in the RC segment pipe. The details of the connection ring CR will be described later.

2 (a) and 2 (b) are cross-sectional views of a main part of a connecting portion of a steel segment pipe, a concrete segment pipe, and a connecting ring constituting the segment pipe of FIG. The portion surrounded by the broken line on the right side of FIG. 2A shows an enlarged view of the portion surrounded by the broken line on the left side of FIG. 2A. Further, the enlarged view of the portion surrounded by the broken line in FIG. 2 (b) is the same as the portion surrounded by the broken line on the right side of FIG. 2 (a), and thus the illustration is omitted.

As shown in FIGS. 2A and 2B, two types of bolt holes RH1 and RH2 are formed in the connection ring CR. The bolt hole (third hole) RH1 shown in FIG. 2A is a hole for temporarily fixing the connection ring CR to the steel segment pipe STS. This bolt hole RH1 does not penetrate between both end faces in the thickness direction of the connection ring CR, and in the connection ring CR, from the surface facing the flange portion SSF of the steel segment pipe STS in the thickness direction of the connection ring CR. It extends and ends in the middle. On the other hand, the bolt hole (fourth hole) RH2 shown in FIG. 2B is a hole for connecting the RC segment pipe STC and the steel segment pipe STS, and the RC segment pipe STC is a perfect circle when viewed from the front. It is arranged at the position formed in. The bolt holes RH2 are formed so as to penetrate between both end faces of the connection ring CR in the thickness direction.

As shown in FIGS. 2A and 2B, both ends of the steel segment SS in the width direction (the axial direction of the tunnel) were bent toward the center of the steel segment pipe STS (the central axis of the tunnel). A flange portion SSF extending in the state is formed. In the case of the steel segment SS to be joined to the connection ring CR and RC segment STC, the position of the flange portion SSF facing the bolt holes RH1 and RH2 of the connection ring CR is in the thickness direction of the flange portion SSF (the axial direction of the tunnel). ), Two types of bolt holes SH1 and SH2 are drilled so as to penetrate between both end faces.

As shown in FIG. 2A, the bolt hole SH1 of the flange portion SSF of the steel segment SS is a hole for temporarily fixing the connection ring CR to the steel segment pipe STS, and is connected to the bolt RH1 of the connection ring CR. It was drilled in the drilling hole to match. The flange portion SSF of the steel segment SS and the connecting ring CR are joined in a state of being tightened by bolts B1 screwed into the bolt holes SH1 and RH1.

Further, as shown in FIG. 2B, the bolt hole SH2 of the flange portion SSF of the steel segment SS is a hole for connecting the RC segment pipe STC and the steel segment pipe STS, and is a hole of the RC segment SC. It is drilled in the drilled hole so as to match the bolt hole CH1 and the bolt hole RH2 of the connecting ring CR. Then, the flange portion SSF of the steel segment SS, the RC segment SC, and the connection ring CR interposed between them are joined in a state of being tightened to each other by bolts B2 screwed into the bolt holes SH2, CH1 and RH2. Has been done. The diameters of the bolt holes RH2, CH1 and SH2 are larger than the diameters of the bolt holes RH1 and SH1, and the diameter of the bolt B2 is larger than the diameter of the bolt B1.

Further, as shown in FIGS. 2A and 2B, water blocking members (first water stopping members) WS1r and WS1s (WS1) are placed between the facing surfaces of the connecting ring CR and the steel segment pipe STS. , And water stop members (second water stop members) WS2r and WS2c (WS2) are installed between the facing surfaces of the connection ring CR and the RC segment pipe STC. The water blocking members WS1 and WS2 are made of, for example, a material having water expansion property.

A seal groove U0 is formed in the flange portion SSF of the steel segment pipe STS. Further, a seal groove U1 is formed in a portion of the connection ring CR facing the flange portion SSF (seal groove U0) of the steel segment pipe STS. As shown in the enlarged view on the right side of FIG. 2A, the water blocking member WS1s is installed in the seal groove U0, and the water blocking member WS1r is installed in the seal groove U1. The water blocking member WS1 is formed by contacting the WS1r in a compressed state. The seal grooves U0 and U1 are formed to be slightly larger than the water stop member WS1 so that the water stop members WS1 (WS1s, WS1r) can be expanded to the periphery when the water stop members WS1 (WS1s, WS1r) are crushed by compression.

Further, a seal groove U2 is formed on the surface of the connection ring CR facing the RC segment pipe STC (directly behind the seal groove U1). Further, a seal groove U3 is formed in a portion of the RC segment pipe STC facing the connection ring CR (seal groove U2). A water stop member WS2r is installed in the seal groove U2, a water stop member WS2c is installed in the seal groove U3, and the water stop members WS2r and WS2c come into contact with each other in a compressed state to form the water stop member WS2. It is formed. The seal grooves U2 and U3 are formed to be slightly larger than the water stop member WS1 so that the water stop member WS2 can expand to the periphery when the water stop member WS2 is crushed by compression.

Such sealing grooves U0, U1, U2 and water blocking members WS1 and WS2 are arranged radially outside the connecting ring CR with respect to the bolts B1 and B2. With such water stop members WS1 and WS2, the water stoppage in the connection ring CR can be improved.

Next, the connection ring CR will be described with reference to FIGS. 3 to 6.

FIG. 3 is a plan view of the connecting ring of FIG. 1 on the facing surface side of the steel segment pipe. The reference numeral X indicates a horizontal axis, and the reference numeral Y indicates a vertical axis. Further, in FIG. 3, the above-mentioned water blocking member WS2 (WS2c, WS2r) is not shown.

The connecting ring CR is formed of an annular metal plate when viewed from the front. A plurality of the above-mentioned bolt holes RH1 and RH2 are formed in the connection ring CR along the circumferential direction of the connection ring CR. Although not particularly limited, the thickness of the connecting ring R is, for example, about 32 mm, the outer diameter is, for example, about 5500 mm, and the inner diameter is, for example, about 5100 mm. As described above, the bolt hole RH1 does not penetrate between both end faces of the connection ring CR in the thickness direction, but is shown for the sake of explanation.

Further, in the present embodiment, the connecting ring CR has, for example, four pieces (main pieces) PMA, PMB, PMB, PMC and one rescue piece (sub-piece) PR joined to each other. There is.

Pieces PMA, PMB, PMB, PMC are the main pieces that form the body of the connecting ring CR. Here, for example, it has four types of pieces having different shapes: a lower piece PMA on the bottom surface side, left and right pieces PMB and PMB, and an upper piece PMC on the top end side. Of these, the left and right piece PMBs are formed in substantially the same shape except that the left and right pieces are inverted.

In the left and right piece PMBs, the facing surfaces L1 and L2 facing both ends in the circumferential direction of the upper piece PMC are opened several degrees below the vertical line (the facing surfaces L1 and L2 are the connecting ring CRs). It gradually opens from the outer circumference to the inner circumference in the direction away from the vertical axis Y). This is to facilitate the assembling of the upper piece PMC at the end in the assembling process of the connecting ring CR. Although not particularly limited, the inclination angles of the facing surfaces L1 and L2 with respect to the vertical line are, for example, about 5 degrees.

Further, although not particularly limited, the weight of each of the left and right piece PMBs is, for example, about 215 kg, and the weight of the upper and lower pieces PMA, PMC is, for example, about 200 kg. As will be described later, since these pieces PM are heavy, they are assembled by using the elector of the shield excavator described later. When assembling the connection ring CR using the Elekta, each piece PM is gripped via the attachment for the Elekta. At this time, a plurality of bolt holes RH2 drilled in each piece PM can be used as grip holes (grip portions) of each piece PM. Therefore, the piece PM itself does not need to be newly provided with special means for gripping with an elector.

Further, in each piece PMA, PMB, PMC of the connection ring CR, for example, two marks M are placed on one end surface (the front surface of the connection ring CR and the surface facing the RC segment tube STC) in the thickness direction of the connection ring CR. Is formed by a punch or the like. This mark M is for confirming the roundness of the connection ring CR immediately after assembly (how close the shape of the connection ring CR is to a perfect circle, or conversely, how much it deviates from the perfect circle). It is a mark. That is, after assembling the connection ring CR, the roundness of the connection ring CR immediately after assembly can be confirmed (measured) by measuring the linear distance between the marks M and M adjacent to each other.

The rescue piece PR is a complementary piece provided to completely fill (close) the gap created by the arrangement of the four pieces PMA, PMB, and PMC so that the connection ring CR becomes a perfect circle. That is, when trying to form the connection ring CR into a perfect circle, the last piece PMC may not be installed, or a gap may occur between the pieces PMB and PMC. Therefore, when the last piece PMC is placed, it is designed so that a gap is created between the last piece PMC and the facing end face of the piece PMB adjacent to it, and the rescue piece PR having the dimension most suitable for the dimension of the gap is provided. , I chose to install from a plurality of types of rescue piece PR prepared in advance with different dimensions. As a result, the connection ring CR can be completely closed along the circumferential direction, so that the water stoppage of the connection ring CR can be ensured.

Although not particularly limited, the rescue piece PR is formed in a substantially trapezoidal shape in a plan view, and its weight is, for example, about 10 kg. Further, in the present embodiment, seven types of rescue piece PRs having different lengths of 1 mm are prepared in advance.

Further, both end faces in the thickness direction of the connection ring CR (4 pieces PMA, PMB, PMC and rescue piece PR) (opposite surfaces of the connection ring CR and the RC segment pipe STC, and the connection ring CR and the steel segment pipe STS). The water-stopping members WS1 and WS2 (see FIG. 2) described above are provided so as to go around the connection ring CR along the circumferential direction. Thereby, the water stopping property of the connecting ring CR can be improved. In the present embodiment, even under a deep water pressure (for example, 0.5 MPa), water leakage at the connecting ring CR can be prevented by providing the water blocking members WS1 and WS2.

FIG. 4A is an enlarged plan view of a main part of the region E1 surrounded by the broken line of the connection ring of FIG. 3, and FIG. 4B is a side surface of the main part of the connection ring as seen from the direction of arrow A3 of FIG. 4A. 4 (c) is a sectional view taken along line I-I of FIG. 4 (a), FIG. 4 (d) is an enlarged sectional view of a bolt hole of FIG. 4 (c), and FIG. 4 (e) is FIG. 4 (e). It is sectional drawing of the line II-II of a).

Pieces PMA, PMB, PMB, and PMC that are adjacent to each other are joined by a combined structure rather than by welding (see FIGS. 4 (b) and 4 (c)). That is, in each piece PMA, PMB, PMB, PMC, a convex portion is formed on one end surface of the connection ring CR in the circumferential direction, and a concave portion is formed on the other end surface, and one piece PMA, PMB, PMB, PMC. The other piece PMA, PMB, PMB, and PMC are joined by fitting the convex portions of the other piece PMA, PMB, PMB, and PMC in a state where a liquid water blocking material (not shown) such as grease is embedded in the concave portion of. When the pieces PMA, PMB, PMB, and PMC adjacent to each other are joined by welding, the water blocking members WS1r and WS2r shown in FIG. 2 cannot be installed on the connecting ring CR without interruption. When the pieces PMA, PMB, PMB, and PMC adjacent to each other are joined in a combined structure, the connection ring does not interrupt the water blocking members WS1r and WS2r at the joints of the pieces PMA, PMB, PMB, and PMC adjacent to each other. It can be installed in CR.

The pieces PMA, PMB, PMB, and PMC adjacent to each other are fixed to each other by a plurality of bolts B3 screwed into each of the plurality of bolt holes RH3 (see FIGS. 4A and 4C). As the bolt B3, for example, an M8 hexagon socket head cap screw is used. By using the countersunk bolt, the head of the bolt B3 does not protrude from the end face of the connection ring CR in the thickness direction, and the end face of the connection ring CR in the thickness direction can be flattened. Therefore, when the RC segment pipe STC is applied to the connection ring CR, a gap due to the bolt B3 can be prevented between the connection ring CR and the RC segment pipe STC, so that the water stoppage at the connection ring CR can be prevented. Can be secured.

As shown in FIGS. 4C and 4D, the bolt holes RH3 have bolt holes RH3a and RH3b having the same axis. One bolt hole RH3a penetrates from one side of the piece PMA (the side facing the face) to the inside of the recess of the piece PMA. The other bolt hole RH3b penetrates the convex portion of the piece PMB. A female screw is formed on the surface of the bolt holes RH3a and RH3b facing the male screw of the bolt B3.

As shown in FIG. 4E, the water blocking member WS1r is installed so that its upper portion protrudes from both end faces in the thickness direction of the pieces PMA, PMB, PMB, and PMC (connection ring CR). Seal grooves U1 and U2 recessed in the thickness direction of the pieces PMA, PMB, PMB, and PMC are formed on both end faces in the thickness direction of the pieces PMA, PMB, PMB, and PMC (connection ring CR) in the circumferential direction of the connection ring CR. It is continuously formed along the seal groove U1 and is joined in a state where the bottom portion of the water blocking member WS1r is fitted into each of the seal grooves U1. As will be described later, in the seal groove U2, after the assembly process of the connection ring CR, the water stop member WS2r (see FIG. 2) has the bottom portion fitted into the seal groove U2 in the same manner as the water stop member WS1r. It is joined with.

5 (a) is an enlarged plan view of a main part of the region E2 surrounded by the broken line of the connection ring of FIG. 3, and FIG. 5 (b) is a side surface of the main part of the connection ring as seen from the direction of arrow A4 of FIG. 5 (c) is a sectional view taken along line III-III of FIG. 5 (a), FIG. 5 (d) is an enlarged sectional view of a bolt hole on the left side of FIG. 5 (c), and FIG. 5 (e) is a diagram. 5 (c) is an enlarged cross-sectional view of the bolt hole on the right side, FIG. 6 (a) is a plan view showing the rescue piece extracted, FIG. 6 (b) is a cross-sectional view of the IV-IV line of FIG. c) is a cross-sectional view taken along the line VV of FIG.

The rescue piece PR and the pieces PMB and PMC adjacent to the left and right of the rescue piece PR are joined by a combined structure instead of welding, similar to the joint structure of the pieces PMA, PMB and PMC (FIGS. 5 (b) to 5 (b) to See (e)). That is, in the rescue piece PR, a convex portion is formed on one end surface of the connection ring CR in the circumferential direction, and a concave portion is formed on the other end surface. It is fitted into the recess of the piece PMB, and the convex portion of the other piece PMC is fitted into the recess of the rescue piece PR via a liquid water blocking material. As a result, similarly to the above, the water blocking members WS1 and WS2 (see FIG. 2) can be installed on the connecting ring CR at the installation location of the rescue piece PR without interruption. Further, in the rescue piece PR, a convex portion is provided on one end surface of the connection ring CR in the circumferential direction and a concave portion is provided on the other end surface, so that when the rescue piece PR is fitted with the pieces PMC and PMB, the rescue piece PR It is designed so that the direction is correct.

The rescue piece PR and the piece PMC adjacent to the right side thereof are fixed by a plurality of bolts B3 screwed into each of the plurality of bolt holes RH3 (FIGS. 5 (a), (c), (e). ), FIGS. 6 (a) and 6 (b)). The bolt B3 is the same as the bolt B3 described with reference to FIG. 4 (c). As a result, the end face of the connection ring CR in the thickness direction can be flattened, and a gap due to the bolt B3 can be prevented between the connection ring CR and the RC segment pipe STC. It is possible to ensure water stoppage with the rescue piece PR). Further, the bolt hole RH3 (see FIGS. 5 (c) and 5 (e)) is also the same as the bolt hole RH3 described with reference to FIGS. 4 (c) and 4 (d).

Further, the rescue piece PR and the piece PMB adjacent to the left side thereof are fixed by a plurality of bolts B4 screwed into each of the plurality of bolt holes RH4 penetrating the connection ring CR (FIG. 5 (a). )-(D), FIGS. 6 (a) and 6 (b)). As the bolt B4, a countersunk bolt is used as in the case of the bolt B3 described with reference to FIG. 4 (c). As a result, the end face of the connection ring CR in the thickness direction can be flattened, and a gap due to the bolt B4 can be prevented between the connection ring CR and the RC segment pipe STC. It is possible to ensure water stoppage with the rescue piece PR).

Further, as shown in FIG. 5D, the bolt hole RH4 has bolt holes RH4a, RH4b, and RH4c having the same axis. One of the bolt holes RH4a and 4c penetrates from each of both sides of the piece PMB (the surface facing the face and the surface facing the steel segment pipe) to the inside of the recess of the piece PMB. A female screw is formed on the surface of the bolt holes RH4a and RH4c facing the male screw of the bolt B4. The other bolt hole RH4b penetrates the convex portion of the rescue piece PR. The bolt hole RH4b is not formed with a female screw, and is formed so as to have a play allowance slightly larger than the diameter of the bolt B4. With this play allowance, it is possible to adjust the state of alignment when the convex portion of the rescue piece PR is fitted into the concave portion of the piece PMB.

In the rescue piece PR, the water blocking members WS1r and WS2r (see FIG. 2) are installed so that their upper portions protrude from both end faces in the thickness direction of the rescue piece PR, as described in FIG. 4 (e). ing. As shown in FIG. 6C, seal grooves U1 and U2 recessed in the thickness direction of the rescue piece PR are provided on both end faces in the thickness direction of the rescue piece PR (connection ring CR) in the circumferential direction of the connection ring CR. It is continuously formed along the seal groove U1 and is joined in a state where the bottom portion of the water blocking member WS1r (see FIG. 2) is fitted into each of the seal grooves U1. As will be described later, in the seal groove U2 of the rescue piece PR, after the assembly process of the connection ring CR, the water stop member WS2r (see FIG. 2) has the bottom of the seal groove U2 in the same manner as the water stop member WS1r. It is joined in a fitted state.

Next, an example of the shield excavator used in the present embodiment will be described with reference to FIG. 7. FIG. 7 is a configuration diagram of the inside of the shield excavator used in the present embodiment as viewed through from the side.

The shield excavator 1 of the present embodiment is, for example, in a muddy water chamber 4 provided in a skin plate 3 behind the cutter board 2 when excavating the ground by pressing the cutter board 2 against the face and rotating it. Muddy water is pumped through the muddy water pipe 5 to stabilize the face by adjusting the muddy water pressure in the muddy water chamber 4 to a pressure commensurate with the earth pressure and ground water pressure of the face, and the muddy water accumulated in the muddy water chamber 4 is drained. It is a muddy water type shield excavator that forms a tunnel in the ground while discharging it to the outside of the tunnel by 6.

The cutter board 2 constituting the shield excavator 1 is a front circular excavation member for excavating a face, and is installed on the front surface of the skin plate 3 in a state of being rotatable in the forward and reverse directions along the circumferential direction of the skin plate 3. Has been done. For example, a spoke type is adopted for this cutter board 2, and a plurality of bits 2a and scraper tooth 2b for crushing boulders and excavating the ground are mounted on the front surface (the surface facing the face). In addition, a through hole (not shown) is formed to take in the earth and sand excavated by the rotation of the cutter board 2 into the muddy water chamber 4. A copy bit 2c is mounted on the outer peripheral surface of the cutter board 2 to perform extra digging during sharp curve construction, attitude control of the shield excavator 1, and the like.

The skin plate 3 located behind the cutter board 2 is composed of, for example, a front body plate 3a and a rear body plate 3b formed of a cylindrical steel plate. The front body plate 3a and the rear body plate 3b are engaged by entering the rear body plate 3b in a state where the spherical bearing portion on the tip end side is in contact with the inner peripheral surface on the rear end side of the front body plate 3a.

On the front side of the front fuselage plate 3a, a partition wall 7 that divides the inside of the skin plate 3 into a face side and an inside of the machine is installed at a position retracted inward from the front surface of the skin plate 3. The muddy water chamber 4 is provided on the face side of the skin plate 3, that is, between the cutter board 2 and the partition wall 7. The muddy water chamber 4 is a space (chamber) that takes in the earth and sand excavated by the rotation of the cutter board 2 and mixes it with the muddy water supplied through the mud pipe 5.

On the other hand, in the machine of the skin plate 3, a mud feeding pipe 5, a mud draining pipe 6, a cutter drive body 10, a plurality of middle-folded jacks 11a, a plurality of shield jacks 11b, and an erector (erector device) 12 and are installed.

The mud feed pipe 5 is a pipe for supplying mud water into the muddy water chamber 4, and is made of, for example, a steel material. The tip end portion (mud discharge port) of the mud feed pipe 5 penetrates the upper part of the front surface of the partition wall 7 and reaches the muddy water chamber 4. As a result, the muddy water pumped through the mud pipe 5 is supplied into the muddy water chamber 4 from the upper part of the front surface of the shield excavator 1. On the other hand, the rear end of the mud pipe 5 extends toward the entrance of the tunnel (excavation hole), and the mud pump (not shown) of the tunnel is provided on the way through a plurality of mud pumps (not shown) arranged at predetermined intervals. It is connected to an external muddy water layer (not shown). The muddy water tank is connected to a muddy water treatment device (not shown) outside the tunnel.

The mud drainage pipe 6 is a pipe for discharging the mud drainage water (mixed mudwater of excavated soil and muddy water) in the muddy water chamber 4 to the outside of the tunnel, and is formed of, for example, a steel material. The tip end portion (mud suction port) of the mud drain pipe 6 penetrates the inner and lower parts of the front surface of the partition wall 7 and reaches the muddy water chamber 4. As a result, the muddy water in the muddy water chamber 4 is discharged from the lower part of the front surface of the shield excavator 1. On the other hand, the rear end of the mud drain pipe 6 extends toward the tunnel entrance and is connected to the tunnel via a plurality of mud pumps (not shown in FIG. 1) arranged at predetermined intervals on the way. It is connected to the external muddy water treatment device. That is, the muddy water in the muddy water chamber 4 is sent to the muddy water treatment device outside the tunnel through the muddy water pipe 6, where it is separated into earth and sand and muddy water, and after the specific gravity and viscosity are adjusted, it is sent to the muddy water tank. Then, it is sent to the muddy water chamber 4 again through the mud pipe 5.

The cutter drive body 10 is a drive source that rotates the cutter board 2 in the forward and reverse directions. The center-folding jack 11a is a device that connects the front body plate 3a and the rear body plate 3b and corrects the propulsion direction of the shield excavator 1. The shield jack 11b takes a reaction force on the segment (steel segment SS or RC segment SC) laid on the inner circumference of the tunnel behind the skin plate 3 and moves the segment (steel segment SS or RC segment SC) to the rear. It is a device that generates propulsive force for advancing the shield excavator 1 including the skin plate 3 by pushing it toward it.

The Elekta 12 grips a plurality of segments (steel segment SS or RC segment SC) near the rear end inside the skin plate 3 and assembles them in an annular shape, thereby forming a segment pipe (described above) on the inner circumference of the excavated hole. It is an apparatus for constructing a steel segment pipe STS or RC segment pipe STC). The erector 12 has an erector ring portion 12r, an erector driving body 12m, a segment grip portion 12h, and a support body 12s.

The electoring portion 12r is installed in the skin plate 3 in a state where it can be swiveled in the forward and reverse directions (left and right) along the face surface. The erector drive body 12m is a drive unit for turning the erector ring portion 12r, and is composed of, for example, a hydraulic motor. The segment grip portion 12h is a mechanical portion for gripping a segment (steel segment SS or RC segment SC), and is supported on the support 12s. The support 12s is mechanically connected to the electoring portion 12r, and is installed so as to be rotatable in the forward and reverse directions (left and right) along the face surface. As a result, the segment grip portion 12h is also installed in a state in which it can swivel in the forward and reverse directions (left and right) along the face surface. Further, in addition to the turning operation, the segment gripping portion 12h is provided in the front-rear direction (axial direction of the shield excavator 1) and the radial direction (diameter direction separated outward from the central axis of the shield excavator 1 and the shield excavator 1). It is possible to move in the radial direction (in the radial direction approaching the central axis) from the outside.

A tail brush 3c is provided on the inner peripheral surface of the rear body plate 3b constituting the skin plate 3 at the rear portion in the traveling direction. The tail brush 3c is made of, for example, a steel wire or urethane foam, and is provided in an annular shape, for example, two at intervals in the traveling direction. The tail brush 3c extends inward with a length that makes contact with the outer peripheral surface of the segment SG, and such a tail brush 3c extends between the inner peripheral surface of the skin plate 3 and the outer peripheral surface of the segment SG. A seal chamber is formed.

Next, an example of the method of assembling the segment pipe of the present embodiment will be described with reference to FIG. 8 (a) to 8 (c) are cross-sectional views of a main part of the ground showing a process of assembling a segment pipe while digging an excavation hole in the ground with a shield excavator. In the ground G, the starting shaft TS and the reaching shaft TE are dug substantially perpendicular to the ground.

First, as shown in FIG. 8A, the cutter plate 2 of the shield excavator 1 is rotated to dig an excavation hole from the inner side surface of the starting shaft TS, and the erector of the shield excavator 1 is formed on the inner circumference of the excavation hole. A plurality of steel segment SSs are attached according to No. 12 (see FIG. 7) to assemble a steel segment pipe STS in a predetermined section. At this time, the shield jack 11b (see FIG. 7) of the shield excavator 1 is pressed against the axial tip surface of the previously assembled steel segment pipe STS to rotate the cutter board 2 while taking the reaction force to rotate the ground G. After digging, the process of attaching a plurality of steel segment SSs to the axial tip surface of the previously assembled steel segment pipe STS by the elector 12 of the shield excavator 1 is repeated to repeat the process of attaching the steel segment pipe STS in a predetermined section. To assemble.

Subsequently, as shown in FIG. 8B, the shield jack 11b of the shield excavator 1 is pressed against the axial tip surface of the assembled steel segment pipe STS to rotate the cutter board 2 while taking a reaction force. After digging the ground G to a predetermined position, a plurality of pieces (pieces PMA, PMB, PMB, PMC and rescue piece PR) are attached to the axial tip surface of the steel segment pipe STS by the elector 12 of the shield excavator 1. Assemble the connection ring CR for forming a perfect circle. Details of the method of assembling the connection ring CR will be described later.

After that, as shown in FIG. 8C, the shield jack 11b of the shield excavator 1 is pressed against the axial tip surface of the connection ring CR, and the cutter board 2 is rotated while taking the reaction force to dig the ground G. After that, a plurality of RC segment SCs are attached to the inner circumference of the excavation hole by the erector 12 of the shield excavator 1 to assemble an RC segment pipe STC in a predetermined section. At this time, the shield jack 11b of the shield excavator 1 is pressed against the axial tip surface of the RC segment pipe STC assembled earlier, and the cutter board 2 is rotated while taking the reaction force to dig the ground G, and then the ground G is dug. The RC segment pipe STC of a predetermined section is assembled by repeating the process of attaching a plurality of RC segment SSs to the tip surface of the RC segment pipe STC assembled in the above in the axial direction by the erector 12 of the shield excavator 1. At this time, in the present embodiment, the RC segment pipe STC can be assembled in a perfect circle in accordance with the connecting ring CR. Therefore, when the RC segment pipe STC is not formed in a perfect circle, RC is caused by stress bias. Damage to the segment tube STC can be suppressed or prevented. Further, since a flat connection ring CR is provided on the tip surface portion of the steel segment pipe STS in the axial direction, when the shield jack 11b is pressed against the RC segment pipe STC to take a reaction force, the steel segment pipe STS Since it is not affected by the step on the tip surface in the axial direction, it is possible to suppress or prevent the RC segment pipe STC from being damaged due to the step on the tip surface of the steel segment pipe STS.

Next, an example of the method of assembling the connection ring of the present embodiment will be described with reference to FIGS. 9 to 16. 9 to 16 (a) are front views of the steel segment pipe assembled in the excavation hole, and FIGS. 9 to 16 (b) are cross-sectional views and views of the VI-VI line of each drawing (a). 9 to 16 (c) are cross-sectional views taken along the line VII-VII of each figure (a).

9 (a) to 9 (c) show the steel segment pipe STS immediately before shifting to the assembly of the RC segment pipe. Note that FIG. 9A illustrates a case where the steel segment pipe STS is not a perfect circle but is slightly distorted. Further, the portion surrounded by the broken line on the lower side of FIG. 9B shows an enlarged view of the portion surrounded by the broken line on the upper side of FIG. 9B. Further, the enlarged view of the portion surrounded by the broken line in FIG. 9 (c) is the same as the portion surrounded by the broken line on the lower side of FIG. 9 (a), and thus the illustration is omitted.

At this stage, bolt holes are not drilled in the flange portion SSF of the steel segment pipe STS. Further, at this stage, the annular water stop member WS1s is already provided on the flange portion SSF of the steel segment pipe STS in a plan view. In the water blocking member WS1s, when a plurality of steel segment SSs are assembled to form a steel segment pipe STS, the water blocking members WS1s of the flange portions SSF of the plurality of steel segment SSs are connected to each other in a plan view. It is formed in an annular shape.

Subsequently, as shown in FIGS. 10A to 10C, a positioning ruler RL is applied to the flange portion SSF of the steel segment pipe STS, and a plurality of bolt hole drilling marks are added to the flange portion SSF. The positioning ruler RL is formed of a thin steel plate having a length of about 1/4 of that of a circular frame.

The positioning ruler PL is perforated with a plurality of positioning holes LH1 and LH2 penetrating between both end faces (front surface and back surface thereof) in the thickness direction. One of the positioning holes LH1 is a hole for marking the position of the bolt hole for inserting the bolt B1 (see FIG. 2A) for fixing the steel segment pipe STS and the connection ring CR. .. The positioning hole LH1 is arranged so that the connection ring CR becomes a perfect circle when a plurality of pieces (pieces PMA, PMB, PMB, PMC and rescue piece PR) are attached to assemble the connection ring CR (pieces PMA, PMB, PMB, PMC and rescue piece PR). (See FIG. 3). The other positioning hole LH2 describes the position of the bolt hole for inserting the bolt B2 (see FIG. 2B) for fixing the RC segment pipe STC, the steel segment pipe STS, and the connection ring CR. This is a hole for the purpose, and is arranged so that the RC segment pipe STC becomes a perfect circle when a plurality of RC segment SCs are attached to assemble the RC segment pipe STC (see FIG. 1).

After that, as shown in FIGS. 11A to 11C, the thickness of the flange portion SSF is located at the position indicated by the positioning ruler RL (see FIG. 10) in the flange portion SSF of the steel segment pipe STS. A plurality of bolt holes SH1 and SH2 penetrating between both end faces in the direction are drilled. One bolt hole (first hole) SH1 is a hole for fixing the steel segment pipe STS and the connection ring CR, and a plurality of pieces (pieces PMA, PMB, PMB, PMC and rescue piece PR) are formed. The connection ring CR is arranged so as to form a perfect circle when it is attached and the connection ring CR is assembled (see FIG. 3). The other bolt hole (second hole) SH2 is a hole for fixing the RC segment pipe STC, the steel segment pipe STS, and the connection ring CR, and a plurality of RC segment SCs are attached to form the RC segment pipe STC. The RC segment pipe STC is arranged so as to be a perfect circle when assembled (see FIG. 1).

At the same time, the rolling correction plan generated in the steel segment pipe STS can be smoothly implemented. That is, even if the steel segment pipe STS installed in the excavation hole has rolling, which is a rotational deviation of the pipe in the circumferential direction, the bolt holes SH1 and SH2 (see FIG. 2) are opened using the positioning ruler RL. By drilling at the position as designed, the rolling that occurs in the steel segment pipe STS can be eliminated. Therefore, the quality of the segment tube ST (see FIG. 1) can be improved.

Depending on the rolling size of the steel segment pipe STS, the vertical ribs of the steel segment SS (a flat plate-shaped protrusion provided toward the central axis of the steel segment pipe STS, which is perpendicular to the flange portion SSF). The bolt holes SH1 and SH2 may be too close to each other to be drilled. In such a case, the bolt holes SH1 and SH2 are drilled at positions where the rolling is as small as possible and the vertical ribs do not interfere with the bolt holes.

Next, a plurality of types of pieces PMA, PMB, PMB, PMC (lower piece PMA, left and right pieces PMB, PMB and upper piece PMC) constituting the connection ring CR (see FIG. 3, etc.) and a plurality of types having different dimensions. The rescue piece PR is conveyed to the tip side of the steel segment pipe STS through the drilling hole. The plurality of bolt holes RH1 and RH2 described above are already formed in the plurality of types of pieces PMA, PMB, PMB, and PMC. As described above, in the present embodiment, since the connection ring CR can be divided into a plurality of types of pieces PMA, PMB, PMB, PMC and rescue piece PR and conveyed, even if the connection ring CR becomes large, steel The connection ring CR can be easily installed at the tip of the segment tube STS. A water blocking member WS1r (see FIG. 2) is provided in the seal groove U1 of the pieces PMA, PMB, PMB, PMC and the rescue piece PR at this stage.

Here, as shown in FIGS. 12A to 12C, first, a plurality of bolt holes RH1 and RH2 of the lower piece PMA and a plurality of bolt holes SH1 and SH2 of the flange portion SSF of the steel segment pipe STS. After aligning the water stop member WS1r installed in the seal groove U1 of the lower piece PMA and the water stop member WS1s installed in the seal groove U2 of the flange portion SSF, the lower piece The lower piece PMA is fixed to the steel segment pipe STS by screwing the bolt B1 into the bolt holes RH1 and SH1 with the PMA in contact with the flange portion SSF. Further, as a result, the water stop member WS1s of the flange portion SSF of the steel segment pipe STS and the water stop member WS1r of the piece PMA are combined to form the water stop member WS1. As described above, the bolt hole RH1 does not penetrate between both end faces of the connection ring CR in the thickness direction, but is shown for the sake of explanation.

Subsequently, as shown in FIGS. 13 (a) to 13 (c), the end portion of the left piece PMB is fitted to the end portion of the lower piece PMA. Then, the plurality of bolt holes RH1 and RH2 of the left piece PMB and the plurality of bolt holes SH1 and SH2 of the flange portion SSF of the steel segment pipe STS are aligned, and the water blocking member WS1r of the left piece PMB and the steel After aligning with the water blocking member WS1s of the segment pipe STS, the left piece PMB is made of steel by screwing the bolt B1 into the bolt holes RH1 and SH1 with the left piece PMB in contact with the flange portion SSF. Fixed to the segment tube STS. After that, the left piece PMB and the lower piece PMA are fixed with bolts B3 (see FIGS. 4A and 4C). Subsequently, similarly to the left piece PMB, the right piece PMB is fixed to the steel segment pipe STS with the bolt B1, and the right piece PMB, the lower piece PMA and the bolt B3 (FIGS. 4A and 4c). ) Refer to). The order of installation of the left and right pieces PMB and PMB may be reversed.

Next, a rescue piece (optimal rescue piece) PR suitable for filling the gap generated between the left piece PMB and the upper piece PMC when the upper piece (last piece) PMC is fitted. Select from a plurality of types of rescue piece PR having different dimensions, and fit the convex portion on one end side (left end side in FIG. 13) of the upper piece PMC into the concave portion of the selected rescue piece PR to form the upper portion. The rescue piece PR is fixed to one end side of the piece PMC in the circumferential direction with a bolt B3 (see FIG. 4C and the like).

Subsequently, similarly to the lower and left and right pieces PMA and PMB, the upper piece PMC to which the rescue piece PR is joined is installed between the left and right pieces PMB and PMB. That is, the convex portion of the circumferential left end of the rescue piece PR is fitted into the concave portion of the circumferential right end of the left piece PMB, and the convex portion of the right piece PMB is fitted into the concave portion of the circumferential end of the upper piece PMC. Fit. At this time, in the present embodiment, as described above, the facing surfaces L1 and L2 of the left and right pieces PMB are slightly open downward with respect to the vertical line, so that the rescue can be performed by sliding the left and right pieces PMB in a lifted manner. The upper piece PMC to which the piece PR is joined can be smoothly installed.

After that, the rescue piece PR joined to the upper piece PMC, the left piece PMB and the bolt B4 (see FIGS. 4A and 4C) are fixed, and the upper piece PMC and the right piece PMB are bolted. Fix with B3. At this time, in the present embodiment, the fixing position of the rescue piece PR can be finely adjusted by the play allowance of the bolt hole RH4b as described above. That is, as shown in FIGS. 5 (c) and 5 (d), first, when the bolt B4 is screwed into the bolt hole RH4 of the rescue piece PR, the bolt B4 is not inserted into the bolt hole RH4c, and the bolt hole RH4a, After inserting up to RH4b, the position of the rescue piece PR is adjusted in that state, and then the bolt B4 is inserted up to the bolt hole RH4c and completely screwed.

After that, the upper piece PMC to which the rescue piece PR is joined is fixed to the flange portion SSF of the steel segment pipe STS with bolts B1.

By using the rescue piece PR in this way, the connection ring CR can be closed even when the connection ring CR is composed of a plurality of pieces PMA, PMB, PMB, and PMC. As a result, the water stoppage of the connection ring CR can be ensured. Further, at this time, an annular water stop member WS1 (see FIG. 2) can be formed between the connection ring CR and the flange portion SSF of the steel segment pipe STS in a plan view. Therefore, the water stopping property of the connecting ring CR can be improved.

Further, in the present embodiment, when assembling the plurality of pieces PMA, PMB, PMC, the erector 12 (see FIG. 7) of the shield excavator 1 is used. This is because the weight of each piece PMA, PMB, PMB, PMC is also increasing as the diameter of the connection ring CR is increased, and each piece PMA, PMB, PMB, PMC is gripped by the elector 12 of the shield excavator 1. By installing the pieces in a predetermined position in this state, the heavy pieces PMA, PMB, PMB, and PMC can be smoothly installed. Therefore, as compared with the case where the pieces PMA, PMB, PMB, and PMC are manually installed, the labor for assembling the connection ring CR can be significantly reduced, and the assembly work time for the connection ring CR can be significantly shortened. ..

Next, as shown in FIGS. 14A to 14C, the roundness of the connecting ring CR is confirmed by measuring the distance of a straight line connecting the adjacent marks M and M in each piece PM. The connection ring CR is preferably a perfect circle, but a certain degree of deviation is allowed as long as the problem does not occur in the RC segment tube STC.

Subsequently, as shown in FIGS. 15 (a) to 15 (c) and 16 (a), the water stop member WS2r is fitted into the seal groove U2 of each piece PMA, PMB, PMB, PMC and the rescue piece PR. Join with. The water blocking member WS2r is formed so as to go around the outer circumference of the connecting ring CR. That is, since the water blocking member WS2r has only one joint, higher water stopping property can be obtained.

After that, as shown in FIGS. 16B and 16C, a plurality of RC segment SCs are installed using the Electa 12 of the shield excavator 1. The portion surrounded by the broken line on the lower side of FIG. 16 (b) is an enlarged view of the portion surrounded by the broken line on the upper side of FIG. 16 (b). Further, the enlarged view of the portion surrounded by the broken line in FIG. 16 (c) is the same as the portion surrounded by the broken line on the lower side of FIG. 16 (a), and thus the illustration is omitted.

A water blocking member WS2c is already provided in the seal groove U3 formed on the surface of the RC segment SC facing the connection ring CR. Here, the RC segment pipe STC is assembled in such a form that the water blocking members WS2c and WS2r of the RC segment SC and the connecting ring CR are in contact with each other.

At this time, in the present embodiment, the bolt hole SH2 drilled in the flange portion SSF of the steel segment pipe STS and the bolt hole RH2 drilled in the connection ring CR are aligned with the bolt hole CH1 of the RC segment SC. The RC segment SC is arranged at the above, and the RC segment SC, the steel segment pipe STS, and the connecting ring CR are fixed with bolts B2. As a result, the RC segment tube STC can be formed into a perfect circle. Further, since the flat connection ring CR is provided on the tip surface portion of the steel segment pipe STS in the axial direction, it is possible to eliminate the step on the tip surface of the steel segment pipe STS.

Further, at this time, an annular water stop member WS2 (see FIG. 2) can be formed between the RC segment pipe STC and the connecting ring CR in a plan view. Therefore, the water stopping property of the connecting ring CR can be improved. As described above, since the water stop member WS2r is formed so as to go around the outer circumference of the connecting ring CR and has only one joint, higher water stoppage can be obtained.

(Second Embodiment)

FIG. 17 is a side view of the segment pipe of the second embodiment. The front view of the segment pipe seen from the direction of arrow A1 in FIG. 17 is the same as that in FIG. 1 (b).

In the present embodiment, the steel segment SS and RC segment SC constituting the steel segment pipe STS and RC segment pipe STC are formed in a hexagonal shape in a plan view, and the steel segment SS and RC segment SC are formed in a hexagonal shape. Are arranged in a staggered pattern.

Here, in the case of a segment tube composed of hexagonal segments in a plan view, a trapezoidal half segment of half a hexagon is formed at the end, but the half segment is a segment tube ST as compared with the hexagonal segment. Weak against the axial force of. On the other hand, in the present embodiment, since the connection ring CR is connected to the axial end of the steel segment pipe STS, the fixing strength of the half segment SSH can be improved.

Further, from the same viewpoint, in the present embodiment, the connection ring CR described above is also applied to the axial end (end face facing the reaching shaft TE) of the RC segment pipe STC composed of the hexagonal RC segment SC in the front view. Are joined. Thereby, the fixing strength of the half segment SCh at the end of the RC segment tube STC can also be improved. Further, although not shown, the connecting ring CR may be joined to the starting end surface of the steel segment pipe STS (the end surface facing the starting shaft TS) for the same reason. Thereby, the fixing strength of the half segment at the start end of the steel segment pipe STS can be improved.

Although the invention made by the present inventor has been specifically described above based on the embodiments, the embodiments disclosed in the present specification are exemplary in all respects and are limited to the disclosed technology. is not it. That is, the technical scope of the present invention is not limitedly interpreted based on the description in the above-described embodiment, but should be interpreted according to the description of the claims, and the scope of claims. All changes are included as long as they do not deviate from the description technology and the technology equivalent to the above and the gist of the claims.

For example, since the mark M may be hidden by a jack spreader or the like and cannot be seen, it is desirable to provide two or more marks M on each main piece. Further, although the bolt hole RH1 is said not to penetrate the connection ring CR, it may be penetrated as long as the tip of the bolt B1 stays in the bolt hole RH1. Further, the seal groove U2 on the RC segment side of the connection ring CR may be previously divided and installed at the stage where the connection ring is divided into each piece.

In the above description, the case where the present invention is applied to a muddy water pressure type shield excavator has been described, but the present invention is not limited to this, and the present invention is also applied to other shield excavators such as a muddy soil pressure type shield excavator. Can be done. Further, the cutter board is not limited to the spoke type, and can be applied to the face plate type.

1 Shield excavator 2 Cutter board 2a Bit 2b Scraper tooth 2c Copy bit 3 Skin plate 3a Front body plate 3b Rear body plate 3c Tail brush 4 Muddy water chamber 5 Mud feed pipe 6 Mud drain pipe 7 Partition 10 Cutter drive body 11a Center-folded jack 11b Shield Jack 12 Elector 12r Elector Ring 12m Elector Drive 12h Segment Grip 12s Support ST Segment Tube STS Steel Segment Tube SS Steel Segment SSF Flange SSh Half Segment SH1 Bolt Hole SH2 Bolt Hole STC RC Segment Tube SC RC Segment SCh Half segment CH1 Bolt hole CR Connection ring PMA, PMB, PMC Piece PR Rescue piece M Mark WS1, WS2 Water stop member U1, U2 Seal groove RH1 Bolt hole RH2 Bolt hole RH3, RH3a, RH3b Bolt hole RH4, RH4a, RH4b Bolt holes B1, B2 Bolts B3 Bolts B4 Bolts RL Positioning ruler LH1, LH2 Positioning holes

Claims (20)

A steel segment pipe assembled by arranging a plurality of steel segments in an annular shape along the inner circumference of the drilling hole,
A concrete segment pipe arranged after the steel segment pipe in the excavation direction of the excavation hole and assembled by arranging a plurality of concrete segments in an annular shape along the inner circumference of the excavation hole.
It is arranged between the steel segment pipe and the concrete segment pipe in a state of being connected to each of the steel segment pipe and the concrete segment pipe, and is formed in an annular shape along the inner circumference of the drilling hole. With a connecting ring,
The connecting ring
A plurality of types of main pieces arranged in a state of being joined to each other so as to form a perfect circle along the inner circumference of the excavation hole, and
A sub-piece arranged in a state of being joined to the main piece in order to fill a gap generated in a part when the plurality of types of main pieces are arranged so as to form a perfect circle.
A segment tube structure comprising. The segment tube structure according to claim 1, wherein the plurality of types of main pieces are four or more. 1. Segment tube structure. The invention according to any one of claims 1 to 3, wherein each of the plurality of types of main pieces is provided with a mark for confirming the deviation between the shape of the connecting ring and the perfect circle. Segment tube structure. The plurality of types of main pieces are joined to each other by a concave portion formed on one side and a convex portion formed on the other side.
According to any one of claims 1 to 4, the main piece and the sub-piece are joined to each other by arranging a concave portion formed on one side and a convex portion formed on the other side. The segment tube structure described. A first water blocking member is provided between the connecting ring and the facing surface of the steel segment pipe, and a second water stopping member is provided between the connecting ring and the facing surface of the concrete segment pipe. Is provided. The invention according to any one of claims 1 to 6, wherein at least a part of the steel segment pipe, the concrete segment pipe, or both of them is provided with a hexagonal segment. Segment tube structure. A steel segment pipe assembled by arranging a plurality of steel segments in an annular shape along the inner circumference of the drilling hole, and the drilling hole arranged after the steel segment pipe in the drilling direction of the drilling hole. In a state of being connected to each of the steel segment pipe and the concrete segment pipe between the steel segment pipe and the concrete segment pipe assembled by arranging a plurality of concrete segments in an annular shape along the inner circumference of the pipe. A plurality of types of main pieces that are installed and joined to each other so as to form a perfect circle along the inner circumference of the excavation hole, and the plurality of types of main pieces are arranged so as to form a perfect circle. A connecting ring comprising: a sub-piece arranged in a state of being joined to the main piece in order to fill a gap generated in a part of the main piece. The connection ring according to claim 8, wherein the plurality of types of main pieces are four or more. 8. Connection ring. The invention according to any one of claims 8 to 10, wherein each of the plurality of types of main pieces is provided with a mark for confirming the deviation between the shape of the connecting ring and the perfect circle. Connection ring. The plurality of types of main pieces are joined to each other by a concave portion formed on one side and a convex portion formed on the other side.
8. The connection ring described. A first water blocking member is provided between the connecting ring and the facing surface of the steel segment pipe, and a second water stopping member is provided between the connecting ring and the facing surface of the concrete segment pipe. The connection ring according to any one of claims 8 to 12, wherein the connection ring is provided. The process of assembling steel segment pipes by arranging multiple steel segments in an annular shape along the inner circumference of the excavation hole excavated by the excavator.
A step of installing a connecting ring formed in an annular shape along the inner circumference of the excavation hole in a state of being joined to the steel segment pipe at the subsequent stage of the steel segment pipe.
A step of assembling a concrete segment pipe in a state of being joined to the connecting ring by arranging a plurality of concrete segments in an annular shape along the excavation hole is provided after the connecting ring.
The installation process of the connection ring is
A step of drilling a first hole for joining the steel segment pipe and the connecting ring on the tip surface of the steel segment pipe in the drilling hole.
A step of drilling a second hole in the drilling hole for joining the steel segment pipe and the concrete segment pipe to the tip surface of the steel segment pipe via the connecting ring.
A step of transporting a plurality of types of main pieces and a plurality of types of subpieces constituting the connection ring to the tip end surface side of the steel segment pipe in the excavation hole.
In order to fill a gap that occurs in a part when the plurality of types of main pieces are arranged so that the connecting ring has a perfect circle, a suitable subpiece is selected from the plurality of types of subpieces, and the optimum subpiece is selected. The process of joining to one end in the circumferential direction of the last sub-piece placed last among multiple types of main pieces,
A plurality of the main pieces other than the last main piece are arranged in order on the tip surface of the steel segment pipe so that the connecting ring has a perfect circle shape, and the steel segment is formed through the first hole. After joining to the pipe, the last main piece to which the optimum subpiece is joined is placed on the tip surface of the steel segment pipe, and the steel segment pipe is joined to the steel segment pipe through the first hole. The assembly process of the steel segment pipe has
A method for assembling a segment pipe structure, which comprises a step of joining the concrete segment pipe and the steel segment pipe through the second hole via the connecting ring. The step of drilling the first hole and the second hole is
In the drilling hole, a first mark for drilling the first hole and a second mark for drilling the second hole are attached to the tip surface of the steel segment pipe by a ruler. Process and
The step of drilling the first hole at the position of the first mark on the tip surface of the steel segment pipe, and
It has a step of drilling the second hole at the position of the second mark on the tip surface of the steel segment pipe.
The main piece joining process is
The third hole formed in the main piece and the first hole drilled in the steel segment pipe are aligned, and the fourth hole drilled in the main piece and the steel segment pipe are aligned. After aligning the second hole drilled in the steel segment pipe, the first fastening member is inserted into the third hole of the main piece and the first hole of the steel segment pipe. The method for assembling a segment pipe structure according to claim 14, further comprising a step of joining the main piece and the steel segment pipe. The method for assembling a segment pipe structure according to claim 14 or 15, wherein the plurality of types of main pieces are four or more. The method for assembling a segment pipe structure according to any one of claims 14 to 16, wherein in the step of installing the connection ring, each of the plurality of types of main pieces is installed by the erector of the excavator. .. The installation process of the connection ring is
A step of bringing the water blocking members installed in advance to the connecting ring and the steel segment pipe into contact with each other and joining them.
A step of joining the plurality of types of main pieces to each other by joining a concave portion formed on one side with a convex portion formed on the other side.
A step of joining the main piece and the sub-piece to each other by joining a concave portion formed on one side with a convex portion formed on the other side.
A step of installing a second water blocking member along the circumferential direction of the connecting ring between the connecting ring and the facing surface of the concrete segment pipe.
The method for assembling a segment pipe structure according to any one of claims 14 to 17, wherein the segment pipe structure is provided. After the installation process of the connection ring and before the assembly process of the concrete segment pipe, it is confirmed whether the shape of the connection ring is formed in a perfect circle by the marks formed on each of the plurality of types of main pieces. The method for assembling a segment pipe structure according to any one of claims 14 to 18, further comprising a step. The invention according to any one of claims 14 to 19, wherein at least a part of the steel segment pipe, the concrete segment pipe, or both of them is provided with a hexagonal segment. How to assemble a segment pipe structure.

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