Side wall of cutting part of excavator

Abstract

To provide a side wall of a cutting part of an excavator capable of efficiently destroying the cutting part without causing a cutting bit of the excavator to slip.SOLUTION: A side wall 1 of a cutting part of an excavator has a core material 2 and can be cut by a shield machine S. The core material 2 includes a non-cutting member 20 made of steel, and a cutting member 21 arranged on an extension of the non-cutting member 20, made of a material that can be cut by the shield machine S, and having a first member 210 and a second member 211. The cutting member 21 is connected to the non-cutting member 20 by placing the non-cutting member 20 between the first member 210 and the second member 211. A gap 213 that opens toward the shield machine S is formed between the first member 210 and the second member 211.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to the side wall of the cutting part used at the start and arrival of shield tunneling method, jacking method, etc.

Background Art

[0002] In the start and arrival of an excavator in the shield tunneling method or the jacking method, it is necessary to remove the temporary wall, and mainly two methods are used: a method of removing the temporary wall in advance and a method of directly cutting the temporary wall with the excavator.

[0003] In tunneling at great depth and large cross-section, since the earth pressure and water pressure become large, it is often the case that the temporary wall is directly cut with the excavator. In the temporary wall to be directly excavated, a plurality of core materials may be arranged as the structural material of the wall together with a hardened material such as concrete, mortar, or soil cement to oppose the earth pressure and water pressure.

[0004] The core materials are linearly arranged from the opening through which the excavator passes to the part other than the opening across the opening. The part arranged in the opening is a member formed of a material that can be cut by the cutting bit of the excavator, and the part arranged outside the opening is a steel material.

[0005] For example, Patent Document 1 describes a earth retaining wall structure formed by joining the end of an H-beam and the end of an excavable member formed by mixing inorganic fibers in a plastic foam. The flange at the end of the H-beam is cut out leaving the web, and the ends of a pair of excavable members are provided so as to reach the cut-out part of the flange with the web of the H-beam interposed therebetween.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] As for the earth retaining wall structure as described in the above Patent Document 1, a plate-like member having the same width as the excavable member is interposed between a pair of excavable members sandwiching the web of the H-beam, and the end face of the plate-like member is in contact with and connected to the tip face of the web. Since the surface facing the excavator is continuously formed flat, the cutting bit of the excavator is less likely to slip and get caught on the excavable member. Therefore, the excavable member is not stably broken, and when the size of the broken lump increases, it may cause an obstacle to the discharge from the excavator.

[0008] Therefore, an object of the present invention is to provide a side wall of the cutting part of an excavator that can be stably broken without the cutting bit of the excavator slipping.

Means for Solving the Problems

[0009] The invention according to claim 1 is a side wall of the cutting part of an excavator having a core material and capable of being cut by an excavator. The core material includes a non-cutting member formed of a steel material, and a cutting member disposed on the extension of the non-cutting member and formed of a material that can be cut by the excavator and having a first member and a second member. The cutting member is disposed with the non-cutting member sandwiched between the first member and the second member and is connected to the non-cutting member. A gap opening toward the excavator is formed between the first member and the second member. The side wall of the cutting part of the excavator is characterized by this.

[0010] The invention according to claim 2 is the side wall of the cutting part of the excavator according to claim 1, characterized in that a reinforcing rib is formed on the side opposite to the gap between the first member and the second member.

[0011] The invention according to claim 3 is the side wall of the cutting part of the excavator according to claim 2, characterized in that the non-cutting member is connected to the first member and the second member by bolts passing through the portion of the reinforcing rib.

[0012] The invention according to claim 4 is the side wall of the cutting part of an excavator as described in any one of claims 1 to 3, characterized in that the first member and the second member are each connected in the axial direction via a connecting member, and the connecting member is formed of a material that can be cut by the cutting bit of the excavator.

[0013] The invention according to claim 5 is the side wall of the cutting part of an excavator according to claim 4, characterized in that a reinforcing rib is formed on the side opposite to the gap between the first member and the second member, the connecting member includes a first connecting member and a second connecting member, and the first connecting member and the second connecting member have fitting protrusions that are fitted between the reinforcing ribs.

[0014] The invention according to claim 6 is the side wall of the cutting part of an excavator according to claim 5, characterized in that the connecting member further includes a third connecting member, and the third connecting member is disposed in the gap between the first member and the second member.

Advantages of the Invention

[0015] According to the present invention, since a gap is formed between the first member and the second member constituting the cutting member, the cutting bit of the excavator is likely to catch on the cutting member and is not likely to slip. As a result, stable destruction of the cutting member is performed, and it is less likely to cause an obstruction to the discharge from the excavator. In addition, the cutting member can be efficiently destroyed by the stable destruction of the cutting member.

[0016] In addition, by forming reinforcing ribs on the surfaces on the side opposite to the gap between the first member and the second member, the strength of the first member and the second member is increased.

[0017] In addition, by connecting the end of the non-cutting member and the ends of the first member and the second member with bolts that penetrate the reinforcing ribs, the tightening force of the bolts is dispersed by the thickness of the thick reinforcing ribs, and frictional force acts evenly on the joint surface between the non-cutting member and the cutting member. Therefore, the fixing strength between the non-cutting member and the cutting member is improved. In addition, the number of bolts can be reduced, and on-site work can be simplified.

[0018] In addition, since the first member and the second member are each connected in the axial direction via a connecting member, and the connecting member is formed of a material that can be cut by the cutting bit of the excavator, even when it is not possible to manufacture a long member due to, for example, the need for a relatively large cutting member for a large-diameter tunnel, a predetermined member can be used to cope with it. Further, since the connecting member is formed of a material that can be cut, it can be cut without problems by the cutting bit.

[0019] In addition, a reinforcing rib is formed on the side opposite to the gap between the first member and the second member. The connecting member includes a first connecting member and a second connecting member. The first connecting member and the second connecting member have fitting protrusions that are fitted between the reinforcing ribs. Therefore, the connection rigidity is increased, and alignment can also be achieved by fitting during connection, improving the workability.

[0020] In addition, the connecting member further includes a third connecting member. The third connecting member is disposed in the gap between the first member and the second member. Therefore, it functions as a spacer for securing the gap between the first member and the second member and improves the rigidity of the connection part.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Mode for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Needless to say, the present invention is not limited to the embodiments.

[0023] 〔First Embodiment〕 Hereinafter, a first embodiment according to the present invention will be described with reference to FIGS. 1 to 7 of the drawings.

[0024] FIG. 1 is a cross-sectional view of a launch shaft in which an excavator is arranged, FIG. 2 is a front view of the side wall of the excavator cutting part, FIG. 3 is a perspective view of the main part of the core material, FIG. 4 is a side view of the main part of the core material, FIG. 5 is an X-X cross-sectional view of FIG. 4, FIG. 6 is a Y-Y cross-sectional view of FIG. 4, and FIG. 7 is an explanatory view for explaining the relationship between the cutting member and the cutting bit of the excavator.

[0025] The side wall of the excavator cutting part according to the present embodiment is applied to the launch shaft of the shield method.

[0026] As shown in FIG. 1, the side wall W of the launch shaft A of the present embodiment is a columnar diaphragm wall (for example, a soil mixing wall) provided with a core material 2.

[0027] The core material 2 functions as a structural material of the side wall W together with the hardening material, and a plurality of them are arranged at intervals in the longitudinal direction in the vertical direction. It can also be said that the core material 2 is a material that strengthens the side wall W. The soil cement of the hardening material is not shown.

[0028] Inside the launching shaft A, a shield tunneling machine S is arranged. The shield tunneling machine S starts by directly cutting one side (the right side in FIG. 1) of the side wall W with a rotating cutter S1.

[0029] The rotating cutter S1 is a common one, provided at the front end of the cylindrical shield tunneling machine S. It can rotate around the central axis of the shield tunneling machine S and is equipped with cutting bits on the front surface.

[0030] The part of the side wall W where the launching opening 10, which is the part directly cut by the shield tunneling machine S, passes through the longitudinal direction (the vertical direction in this embodiment) of the core material 2 is the side wall 1 of the tunneling machine cutting part.

[0031] As shown in FIGS. 1 and 2, the side wall 1 of the tunneling machine cutting part of the launching shaft A is formed by arranging a plurality of core materials 2 extending in the vertical direction at intervals from each other, and includes those formed of materials that can be cut by the shield tunneling machine S.

[0032] The launching opening 10 opened by directly excavating with the shield tunneling machine S is the part indicated by the dotted line in FIG. 2. Through the launching opening 10 in the vertical direction, the core materials 2 of the side wall 1 of the tunneling machine cutting part are respectively arranged.

[0033] The core material 2 of the side wall 1 of the tunneling machine cutting part includes a non-cutting member 20 formed of steel material and a cutting member 21 arranged on the extension of the non-cutting member 20 and formed of a material that can be cut by the cutting bits provided on the rotating cutter S1 of the shield tunneling machine S.

[0034] The cutting member 21 is arranged with its longitudinal direction along the vertical direction. The cutting member 21 is arranged to cover the launching opening 10. That is, the cutting member 21 is arranged over a region sufficiently wider than the region of the launching opening 10 in a front view.

[0035] The non-cutting member 20 is arranged with its longitudinal direction along the vertical direction. Since the non-cutting member 20 is not cut, it is formed of, for example, an I-beam 3 as a steel material and is arranged continuously in the vertical direction of the cutting member 21.

[0036] The upper end of the cutting member 21 and the lower end of the non-cutting member 20 are connected, and the lower end of the cutting member 21 and the upper end of the non-cutting member 20 are connected.

[0037] The cutting member 21 will be arranged on the extension of the non-cutting member 20. In other words, the non-cutting member 20 will be arranged on the extension of the cutting member 21.

[0038] The upper end of the cutting member 21 and the lower end of the non-cutting member 20 are connected, and the lower end of the cutting member 21 and the upper end of the non-cutting member 20 are connected. In this state, they constitute one core material 2 in the vertical direction and are arranged on the extension. That is, the cutting member 21 and the non-cutting member 20 connected in series in the vertical direction will play the structural function of one core material 2 on the side wall W of the cutting part side wall 1 of the tunneling machine. The structural function means, for example, the cross-sectional performance. When focusing on one core material 2, the non-cutting member 20 and the cutting member 21 will have the same cross-sectional performance.

[0039] For the I-beam 3 of the non-cutting member 20, one flange 30 is provided so as to face the inside of the starting shaft A, and the other flange 30 is provided so as to face the outside of the starting shaft A.

[0040] The web 31 of the I-beam 3 of the non-cutting member 20 is provided along the inside and outside direction of the starting shaft A in a plan view.

[0041] The cutting member 21 only needs to have the function as a core material 2 and be a material that can be cut by the cutting bit b (see FIG. 7) of the shield tunneling machine S. In this embodiment, it is FRP (fiber reinforced plastic) formed of glass long fibers, glass short fibers, and unsaturated polyester resin. As another example, it may be formed of plastic or plastic foam reinforced with fibers such as glass fibers, carbon fibers, and basalt fibers.

[0042] Figure 3 shows the part where the lower end of the non-cutting member 20 and the upper end of the cutting member 21 are connected.

[0043] As shown in FIGS. 3, 5, and 6, the cutting member 21 includes a first member 210 and a second member 211. The first member 210 and the second member 211 are formed in a symmetrical shape about the web 31 of the H-beam 3 when installed. The first member 210 and the second member 211 are each formed in a substantially groove shape.

[0044] The width B1 of the first member 210 and the second member 211 is substantially the same as the width B2 (the inner distance between the flanges 30) of the web 31 of the H-beam 3, and in plan view, the first member 210 and the second member 211 are adapted to fit between the flanges 30 of the H-beam 3.

[0045] The height H1 of the first member 210 and the second member 211 is lower than the height H2 from the web 31 of the flange 30 of the H-beam 3, and in plan view, the first member 210 and the second member 211 are adapted to fit into the concave space formed by the flange 30 and the web 31 of the H-beam 3.

[0046] In plan view, the first member 210 fits into one of the concave spaces formed by the flange 30 and the web 31 of the H-beam 3, and the second member 211 is formed to fit into the other concave space formed by the flange 30 and the web 31 of the H-beam 3. Therefore, when temporarily placing the non-cutting member 20 and the cutting member 21 in a state where they are connected to form one core material 2, such as before construction and burial in the ground, the cutting member 21 is less likely to contact the placement surface, preventing damage and the like. In addition, in a plan view, the first member 210 and the second member 211 are each received in both concave spaces formed by the flange 30 and the web 31 of the I-beam 3. If the outer surfaces of the auxiliary ribs 210a and 211a of the first member 210 and the second member 211 are each in contact with the inner surface of each flange 30 of the I-beam 3 (B1 = B2), even when a horizontal force acts due to cutting by the cutting bit b or the like, a frictional force is generated between the outer surfaces of the auxiliary ribs 210a and 211a of the first member 210 and the second member 211 and the inner surfaces of the flanges 30 of the I-beam 3, and the connection rigidity between the non-cutting member 20 and the cutting member 21 can be increased.

[0047] The first member 210 and the second member 211 have a length sufficiently longer than the vertical length of the starting opening 10 and are substantially plate-shaped in an overall view.

[0048] On each of the first member 210 and the second member 211, on both sides of the flange 30 side, which is the opposite side of the surface facing the web 31 of the I-beam 3, auxiliary ribs 210a and 211a are formed as protrusions along the axial direction (vertical direction) of the core material 2.

[0049] The reinforcing ribs 210a and 211a of the first member 210 and the second member 211 are also flanges, and the portions other than the reinforcing ribs 210a and 211a are also webs.

[0050] Note that it is desirable that the corner portion formed by the intersection of the surface of the first member 210 and the second member 211 facing the web 31 of the I-beam 3 and the surface facing the shield tunneling machine S is sharp without chamfering, because the cutting bit of the shield tunneling machine S is likely to get caught.

[0051] Then, the ends of the first member 210 and the second member 211 are overlapped and clamped on both sides of the web 31 at the end of the H-beam 3 that constitutes the non-cutting member 20, such that the reinforcing ribs 210a, 211a face away from the web 31 side. At the portions where the reinforcing ribs 210a, 211a are formed, bolts 22 are passed through the bolt insertion holes 31h, 210h, 211h formed in the web 31 of the H-beam 3, the first member 210, and the second member 211 that overlap each other, and tightened with nuts (not shown) to connect the end of the non-cutting member 20 and the end of the cutting member 21.

[0052] Then, a gap 213 having the same width as the thickness of the web 31 of the H-beam 3 is formed between the first member 210 and the second member 211, and the reinforcing ribs 210a, 211a are disposed on the surfaces of the first member 210 and the second member 211 opposite to the gap 213.

[0053] The gap 213 is disposed on the extension of the web 31 of the H-beam 3, and since one flange 30 of the H-beam 3 faces the inner peripheral surface of the starting shaft A, the gap 213 opens toward the shield tunneling machine S installed in the starting shaft A.

[0054] Note that FIGS. 3 and 4 show only the connection portion between the upper end of the cutting member 21 and the lower end of the non-cutting member 20 in one core material 2, but both upper and lower ends of the cutting member 21 are connected to the ends of the non-cutting member 20, respectively.

[0055] When the shield tunneling machine S is advanced to cut the starting opening 10, as shown in FIG. 7, the cutting bit b of the shield tunneling machine S is likely to catch in the gap 213 formed between the first member 210 and the second member 211, preventing slipping, enabling stable destruction of the cutting member 21, and making it less likely to obstruct the discharge from the shield tunneling machine S (discharge of excavated materials from chambers, screw conveyors, spoil pipes, mud pipes, etc.). Also, the cutting member 21 can be efficiently destroyed by the stable destruction of the cutting member 21.

[0056] If the corners of the first member 210 and the second member 211 facing both sides of the opening of the gap 213 are kept angled, the cutting bit b is more likely to be caught initially.

[0057] Since the first member 210 and the second member 211 are formed with reinforcing ribs 210a and 211a, they are less likely to flex and come into contact with each other to cause the gap 213 to disappear. That is, the first member 210 and the second member 211 connected by sandwiching the non-cutting member 20 (web 31 of the I-beam 3) at the axial end portions can approach each other in the direction of contact when flexure occurs toward the gap 213 side (particularly significantly close in the central portion in the axial direction), but since the reinforcing ribs 210a and 211a are formed on the opposite side of the gap 213, they resist flexure.

[0058] Since they are connected by long bolts 22 passing through the portions of the reinforcing ribs 210a and 211a corresponding to the flanges, the tightening force of the bolts 22 is dispersed by the thickness of the thick reinforcing ribs 210a and 211a, and the frictional force acts evenly on the joint surface between the non-cutting member 20 and the cutting member 21, so the fixing strength between the non-cutting member 20 and the cutting member 21 is improved. Also, the number of bolts can be reduced, and on-site work can be simplified.

[0059] Since the bolts 22 are fastened to the reinforcing ribs 210a and 211a formed on both side edges of each of the first member 210 and the second member 211, the distance between the bolts 22 provided between the reinforcing ribs 210a and 211a and the reinforcing ribs 210a and 211a in each member of the first member 210 and the second member 211 can be increased, and the rigidity can also be increased against bending at the connection portion with the non-cutting member 20.

[0060] When constructing the side wall 1 of the excavator cutting part, when building the core material 2 in which the non-cutting member 20 and the cutting member 21 are connected and integrated into the soil cement, since a gap 213 is formed between the first member 210 and the second member 211 constituting the cutting member 21, the soil cement flows into the gap 213, making it difficult to float up, and the accurate placement of the core material 2 can be achieved.

[0061] 〔Second Embodiment〕 Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 8 to 11 of the drawings. Note that the description of the same parts as those in the first embodiment will be omitted, and mainly the different parts will be described.

[0062] In this embodiment, a large-diameter starting opening 10 is formed in the side wall 1 of the cutting part of the excavator, such as a large shield tunneling machine S.

[0063] In order to cut the large-diameter starting opening 10, it is necessary to lengthen the cutting member 21, and it may be difficult to form the cutting member 21 as a single piece due to manufacturing limitations or the like. In that case, the cutting members 21 are connected in a plurality of axial directions to ensure the required length.

[0064] In this embodiment, as shown in FIGS. 8 to 10, the first member 210 and the second member 211 of the cutting member 21 are formed by being connected via a connecting member 23 which is a joint member in the axial direction.

[0065] The connecting member 23 includes a first connecting member 230, a second connecting member 231, and a third connecting member 232.

[0066] The first connecting member 230, the second connecting member 231, and the third connecting member 232 have substantially the same width as the first member 210 and the second member 211, and are in the shape of a substantially plate-like body having a predetermined length, and are formed of a material that can be cut by the cutting bit b of the shield tunneling machine S in the same manner as the first member 210 and the second member 211.

[0067] The first connecting member 230 and the second connecting member 231 are formed in a symmetrical shape with the gap 213 (the third connecting member 232) as the center when installed.

[0068] On one side of the first connecting member 230 and the second connecting member 231, fitting protrusions 2300 and 2310 are formed with the same width as the interval between the reinforcing ribs 210a and 211a on both sides of the first member 210 and the second member 211, and the same thickness as the protruding height of the reinforcing ribs 210a and 211a. The portions other than the fitting protrusions 2300 and 2310 are formed with a predetermined thickness so as to contact the surfaces of the reinforcing ribs 210a and 211a.

[0069] The third connecting member 232 is in a flat plate shape and has the same thickness as the interval of the gap 213 formed between the first member 210 and the second member 211. The third connecting member 232 functions as a spacer for securing the gap 213.

[0070] To connect the first members 210A and 211A arranged at the lower part and the first members 210B and 211B arranged at the upper part, the first connecting member 230 is arranged across the surfaces on the side opposite to the gap 213 side at the ends of the first members 210A and 210B arranged at the upper and lower parts, the second connecting member 231 is arranged across the surfaces on the side opposite to the gap 213 side at the ends of the second members 211A and 211B arranged at the upper and lower parts, and the third connecting member 232 is arranged across the gap 213 at the ends of the first members 210A and 210B and the second members 211A and 211B arranged at the upper and lower parts and connected.

[0071] Specifically, the fitting protrusion 2300 of the first connecting member 230 is fitted into the concave portion formed between the reinforcing ribs 210a at the ends of the first members 210A and 210B arranged at the upper and lower parts and overlapped, the fitting protrusion 2310 of the second connecting member 231 is fitted into the concave portion formed between the reinforcing ribs 211a at the ends of the second members 211A and 211B arranged at the upper and lower parts and overlapped, the third connecting member 232 is fitted into the gap 213 at the ends of the first members 210A and 210B and the second members 211A and 211B arranged at the upper and lower parts and overlapped, and the horizontally adjacent members are fixed.

[0072] In this embodiment, one of the connecting members 23 is adhered to the first members 210A and 211A arranged at the lower part with an adhesive, and the other is fixed by being tightened with bolts and nuts to the first members 210B and 211B arranged at the upper part.

[0073] In Fig. 9, a state is shown in which one side of the connecting member 23 is adhered to the first member 210A and the second member 211A disposed at the lower part with an adhesive, and the other side is not yet connected to the first member 210B and the second member 211B disposed at the upper part.

[0074] The opposing inner surfaces of the reinforcing ribs 210a of the first member 210A, the surfaces on the opposite side of the gap 213, and the web portions between the reinforcing ribs 210a are adhered to the first connecting member 230.

[0075] The opposing inner surfaces of the reinforcing ribs 211a of the second member 211A, the surfaces on the opposite side of the gap 213, and the web portions between the reinforcing ribs 211a are adhered to the second connecting member 231.

[0076] The surfaces on the gap 213 side of the first member 210A and the second member 211A are adhered to the third connecting member 232.

[0077] The first member 210B disposed at the upper part is fitted between the first connecting member 230 and the third connecting member 232, and the second member 211B disposed at the upper part is fitted between the second connecting member 231 and the third connecting member 232. Then, the cutting part bolts 24 inserted through the bolt insertion holes 230h, 231h, 232h, 210h, and 211h provided in each of the first connecting member 230, the second connecting member 231, the third connecting member 232, the reinforcing ribs 210a of the first member 210B, and the reinforcing ribs 211a of the second member 211B are passed through (Fig. 11) and tightened with nuts (not shown) to be connected.

[0078] The cutting part bolts 24 are formed of a material that can be cut by the cutting bit b of the shield tunneling machine S, similar to the first member 210 and the second member 211. The nuts applied to the cutting part bolts 24 are also formed of a material that can be cut in the same manner.

[0079] If the first member 210A and the second member 211A that are arranged at the lower part in a factory or the like in advance and one end portions of the first connecting member 230, the second connecting member 231, and the third connecting member 232 are adhered, then at the construction site, it is only necessary to connect the first member 210B and the second member 211B that are arranged at the upper part and the other end portions of the first connecting member 230, the second connecting member 231, and the third connecting member 232 with the cutting portion bolts 24. Therefore, the number of the cutting portion bolts 24 is reduced and the connection work at the site is alleviated.

[0080] In addition, the connection by bolts or adhesion may be performed when the core material 2 is built, or may be performed in advance. Further, all may be bolted or adhered, or conversely to this embodiment, the lower part may be bolted and the upper part may be adhesively joined.

[0081] In this way, the first member 210 and the second member 211 are each connected in the axial direction via the connecting member 23. Since the connecting member 23 is formed of a material that can be cut by the cutting bit b of the shield tunneling machine S, even when it is impossible to manufacture a long member in production due to the need for a relatively large launching opening 10 for a large-diameter tunnel, etc., a predetermined member can be used to cope with it. Further, since the connecting member 23 is formed of a material that can be cut, it can be cut without problems by the cutting bit b.

[0082] Reinforcing ribs 210a and 211a are formed on the side opposite to the gap 213 between the first member 210 and the second member 211. The connecting member 23 includes a first connecting member 230 and a second connecting member 231. The first connecting member 230 and the second connecting member 231 have fitting protrusions 2300 and 2310 that are fitted between the reinforcing ribs 210a and 211a. Therefore, the connection rigidity is increased, and alignment can also be performed by fitting when connecting, improving the workability.

[0083] The connecting member 23 further includes a third connecting member 232. Since the third connecting member 232 is arranged in the gap 213 between the first member 210 and the second member 211, it functions as a spacer for securing the gap 213 between the first member 210 and the second member 211 and improves the rigidity of the connection portion.

[0084] 〔Other Modification Examples〕 The present invention is not limited to the above-described embodiments. For example, the following are also included.

[0085] In this embodiment, the non-cutting member of the core material is formed of I-shaped steel, but it may be other steel materials such as H-shaped steel or channel steel. Even in that case, a gap can be formed by sandwiching the web of the H-shaped steel or channel steel between the first member and the second member.

[0086] In this embodiment, the core material extending linearly in the vertical direction has been described, but it can also be applied to the core material arranged in the horizontal direction.

[0087] In this embodiment, it was used for the launching shaft of the shield method, but it is not limited to this, and it may also be the arrival shaft of the shield method. Further, it may be used for the launching / arrival of the propulsion method. Also, instead of a shaft, it may be used for the launching / arrival part of the tunneling machine in the construction of the underground joint part between tunnels (for example, a branch part or a confluence part), and the position where it is provided is not limited to only the side walls facing each other in the horizontal direction, and it may also be used for the side walls facing each other in the vertical direction, that is, side walls such as the upper wall or the bottom wall.

[0088] In this embodiment, soil cement was adopted as the hardening material to which the core material is applied, but it is not limited to this, and hardening materials such as fluidized treated soil, mortar, and concrete may also be used. That is, the core material is not limited to that of the soil mixing wall of the columnar diaphragm wall, and it may also be something that strengthens the wall body such as an S structure or an SRC structure.

[0089] Each technical matter in any of the embodiments may be applied to other embodiments as an example.

Description of Reference Numerals

[0090] 1 Side wall of the cutting part of the tunneling machine 10 Launching opening 2 Core material 20 Non-cutting member 21 Cutting member 210 First member 210a Reinforcing rib 211 Second member 211a Reinforcing rib 213 Gap 22 Bolt 23 Connecting member 230 First connecting member 2300 Fitting projection 231 Second connecting member 2310 Fitting projection 232 Third connecting member 24 Cutting part bolt 3 I-beam 30 Flange 31 Web

Claims

1. A side wall of a cutting part of an excavator having a core material and capable of being cut by an excavator, wherein the core material includes a non-cutting member formed of a steel material, and a cutting member disposed on an extension of the non-cutting member and formed of a material that can be cut by the excavator, the cutting member having a first member and a second member, the cutting member is disposed with the non-cutting member sandwiched between the first member and the second member and connected to the non-cutting member, and a gap opening toward the excavator is formed between the first member and the second member. A side wall of a cutting part of an excavator, characterized by the above.

2. Reinforcing ribs are formed on the side opposite to the gap between the first member and the second member. The side wall of the cutting part of an excavator according to Claim 1, characterized by the above.

3. The non-cutting member is connected to the first member and the second member by bolts passing through the portion of the reinforcing ribs. The side wall of the cutting part of an excavator according to Claim 2, characterized by the above.

4. The first member and the second member are each connected via a connecting member in the axial direction, and the connecting member is formed of a material that can be cut by a cutting bit of the excavator. The side wall of the cutting part of an excavator according to any one of Claims 1 to 3, characterized by the above.

5. Reinforcing ribs are formed on the side opposite to the gap between the first member and the second member, the connecting member includes a first connecting member and a second connecting member, and the first connecting member and the second connecting member have fitting protrusions that are fitted between the reinforcing ribs. The side wall of the cutting part of an excavator according to Claim 4, characterized by the above.

6. The connecting member further includes a third connecting member, and the third connecting member is disposed in the gap between the first member and the second member. The side wall of the cutting part of an excavator according to Claim 5, characterized by the above.

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