Earth pressure shield machine

Abstract

To improve the ability of an earth pressure shield machine to mix excavated soil, additives, water, etc.SOLUTION: A connecting rod portion CB of a spoke portion 2Sb that constitutes a cutter head 2 of an earth pressure shield machine 1 is inclined so as to gradually protrude toward a chamber 4 from a hub portion 2H in a center of the cutter head 2 toward an outer ring portion 2R on an outer periphery of the cutter head 2. This gives the connecting rod portion CB a function of a kneading member that stirs, mixes, and kneads excavated soil, additives, water, etc. that have entered the chamber 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an earth shield machine, and more particularly to a kneading structure that stirs, mixes, and kneads excavated soil, additives, water, etc., in a chamber of the earth shield machine. [Background technology]

[0002] An earth pressure shield machine is equipped with a mechanism for forming an excavation tunnel in the ground by pressing the cutter head attached to the front of the machine against the face of the ground and rotating it as it moves forward, a mechanism for filling and pressurizing the chamber with excavated earth and sand, and then continuously discharging an amount of earth corresponding to the amount of excavation using a screw conveyor or the like, thereby balancing the earth pressure at the face and the earth pressure in the chamber, a mechanism for injecting additives into the chamber, and a mechanism for stirring, mixing and kneading the excavated earth and sand using the cutter head, stirring blades, fixed blades etc. to prevent the excavated earth and sand from adhering or accumulating.

[0003] These mechanisms are closely related to each other and need to function in a balanced manner even when conditions change, so it is necessary to consider how to manage them. In particular, it is necessary to give careful consideration to the structure and layout of the kneading mechanism that kneads the excavated soil, additives, water, etc. to achieve plastic fluidity by mixing them together, so as to prevent the soil from rotating together, adhering, or separating.

[0004] Such a mixing mechanism is composed of a cutter head, an agitating blade provided on the back surface of the cutter head, a fixed blade provided on a partition surface facing the back surface of the cutter head, a central agitator provided in the center of the cutter head, an agitating blade (in the case of an eccentric multi-shaft type) provided on the cutter drive shaft, or a combination of these. In large-diameter earth pressure shield tunneling machines, the peripheral speed of the cutter in the center of the cutter head is slow, so a central agitator is sometimes provided that can efficiently agitate and mix the central part of the cutter head.

[0005] Regarding mud pressure shield machines, for example, Patent Document 1 discloses a structure in which mixing blades are provided on both the back surface and partition surface of the cutter head of the shield machine, thereby stirring and mixing the excavated soil, additives and water that have entered the chamber of the shield machine simultaneously with the rotation of the cutter head. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2015-21340 A Summary of the Invention [Problem to be solved by the invention]

[0007] As described above, in an earth pressure shield machine, it is important to thoroughly mix the excavated soil, additives, water, etc. that have entered the chamber. However, depending on the shape of the earth pressure shield machine, it may not be possible to make the mixing blades large, which poses the problem of a significant reduction in the ability to mix the excavated soil, additives, water, etc.

[0008] The present invention has been made in light of the above-mentioned technical background, and aims to provide a technology that can improve the ability of an earth pressure shield machine to mix excavated soil, additives, water, etc. that have entered the chamber. [Means for solving the problem]

[0009] In order to solve the above problems, the mud pressure shield machine of the present invention described in claim 1 comprises a cutter machine, the cutter machine comprising: a central section supported on the front surface of the equipment body in the traveling direction in a state in which it can freely rotate along the circumferential direction of the equipment body and provided in the center when viewed from the front; an outer peripheral frame section consisting of a frame body having a circular shape when viewed from the front along the outer periphery of the equipment body; a plurality of spoke sections provided between the central section and the outer peripheral frame section in a state spaced apart from each other along the circumferential direction of the outer peripheral frame section and connecting the central section and the outer peripheral frame section; a first connecting section provided between adjacent spoke sections along the circumferential direction of the outer peripheral frame section and extending from the central section toward the outer peripheral frame section; and a second connecting section for attaching the first connecting section to the outer peripheral frame section; the first connecting portion is formed so as to protrude toward the chamber side and constitutes a third kneading member that stirs, mixes, and kneads the excavated soil and additives that have entered the chamber. The first connecting portion is formed so as to protrude toward the chamber side and constitutes a third kneading member that stirs, mixes, and kneads the excavated soil and additives that have entered the chamber.

[0010] The mud pressure shield tunneling machine of the present invention described in claim 2 is characterized in that, in the invention described in claim 1, the first connecting portion is inclined so as to protrude toward the chamber as it approaches the second connecting portion.

[0011] The mud pressure shield machine of the present invention described in claim 3 is the invention described in claim 2, characterized in that the cutter board has a plurality of types of inclination angles of the first connecting portion.

[0012] The mud pressure shield tunneling machine of the present invention described in claim 4 is characterized in that, in the invention described in claim 3, the inclination angles of the first connecting portions are different between adjacent first connecting portions.

[0013] The mud pressure shield machine of the present invention described in claim 5 is characterized in that, in the invention described in any one of claims 1 to 4, the second connecting portion is a face plate portion. Effect of the Invention

[0014] According to the present invention, it is possible to improve the ability of an earth pressure shield machine to mix excavated soil, additives, water, etc. that have entered the chamber. [Brief description of the drawings]

[0015] [Figure 1] 1 is a schematic diagram showing the inside of an earth pressure shield machine according to one embodiment of the present invention from the side. FIG. [Diagram 2] FIG. 2 is a front view of the cutter head of the earth pressure shield machine of FIG. 1. [Diagram 3] FIG. 3 is a rear view of the cutter head of FIG. 2. [Figure 4] This is a rear view of the bulkhead plate of the mud pressure shield machine in Figure 1, looking at the position of line II from the direction of the arrow. [Diagram 5] 5(a) is an enlarged plan view of a main portion of a spoke portion of the cutter head in FIG. 3, and (b) and (c) are side views of the spoke portion in FIG. 5(a). [Figure 6] 6(a) is an enlarged plan view of a main portion of a spoke portion of the cutter head in FIG. 3, and (b) and (c) are side views of the spoke portion in FIG. 6(a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the embodiment, the same components are generally designated by the same reference numerals, and the repeated description will be omitted.

[0017] Figure 1 is a schematic diagram showing the inside of the mud shield machine of this embodiment from the side, Figure 2 is a front view of the cutter head of the mud shield machine of Figure 1, Figure 3 is a rear view of the cutter head of Figure 2, and Figure 4 is a rear view of the bulkhead plate of the mud shield machine of Figure 1, looking from the direction of the arrow at the position of line II.

[0018] The mud pressure shield machine 1 of this embodiment shown in Figures 1 to 4 is an excavation machine that fills a chamber 4 between the cutter head (cutter disk) 2 and the machine body 3 with soil excavated by the cutter head 2, injects additives into the soil and mixes it to make the soil have plastic fluidity (the ability to freely deform and move) and high water-stopping properties, and uses the resulting soil pressure to build an excavated shaft while stabilizing the face. Although not particularly limited, the diameter of the cutter head 2 of the mud pressure shield machine 1 is, for example, about 4070 mm, and the machine length of the mud pressure shield machine 1 is, for example, about 9170 mm.

[0019] As shown in Figures 1 to 3, the cutter head 2 is a drilling plate that is circular in front view for excavating the face of the natural ground, and is installed on the front of the equipment body 3 in a state where it can freely rotate in both forward and reverse directions along the circumferential direction of the cutter head 2.

[0020] The cutter head 2 is, for example, a spoke-type cutter head. That is, as shown in Fig. 2 and Fig. 3, the cutter head 2 includes a hub portion (center portion) 2H in the center of the excavation surface, an outer peripheral ring portion (outer peripheral frame portion) 2R provided so as to surround the outer periphery of the hub portion 2H, eight spoke portions 2S provided between the hub portion 2H and the outer peripheral ring portion 2R, and openings 2A provided between adjacent portions of the eight spoke portions 2S in the width direction. By forming the cutter head 2 in this manner as a spoke type, the opening ratio can be increased, so that gravel can be taken into the chamber 4 without breaking it as much as possible.

[0021] As shown in Fig. 2, a bit 5a called a center bit is attached to the front (the surface facing the face) of the hub portion 2H of the cutter head 2. Note that other excavation members such as a cone head type roller bit may also be attached to the hub portion 2H.

[0022] A number of bits 5b are attached to the front surface (the surface facing the face) of the outer ring portion 2R of the cutter head 2. In addition, for example, two bits 5c called copy bits are attached to the outer peripheral surface (the surface facing the excavation hole) of the outer ring portion 2R so as to be positioned opposite each other. These bits 5c have functions such as over-excavation during sharp curve construction and posture control of the mud pressure shield machine 1.

[0023] 2 and 3, the spoke portion 2S of the cutter head 2 has two different types of spoke portions 2Sa, 2Sb, and these two types of spoke portions 2Sa, 2Sb are arranged alternately along the circumferential direction of the cutter head 2. One of the spoke portions 2Sa is composed of a single face plate provided to connect the hub portion 2H and the outer peripheral ring portion 2R.

[0024] The other spoke portion (connecting portion) 2Sb is provided between the adjacent spoke portions 2Sa along the circumferential direction of the cutter head 2, and includes a connecting rod portion (first connecting portion) CB extending from the hub portion 2H toward the outer circumferential ring portion 2R, and a face plate portion (second connecting portion) FP provided between the connecting rod portion CB and the outer circumferential ring portion 2R and attaching the connecting rod portion CB to the outer circumferential ring portion 2R. The configuration of the connecting rod portion CB of the spoke portion 2Sb will be described in detail later.

[0025] As shown in Fig. 2, a plurality of bits 5d are provided along the radial direction (direction from the center of the cutter head 2 toward the outer periphery) of the cutter head 2 at the center in the width direction (circumferential direction of the cutter head 2) on the front surface (surface facing the face) of the spoke portion 2Sa and the face plate portion FP. A plurality of scraper teeth 6 are provided along the edges at both ends in the width direction on the front surface of the spoke portion 2Sa and the face plate portion FP. In addition to the bits 5d, other excavation members such as roller bits may be provided on the spoke portion 2Sa.

[0026] As shown in Figs. 2 and 3, the spoke portion 2Sa is provided with an additive injection portion 7a. The additive injection portion 7a is a portion for injecting a mud-making material, such as a bentonite-based additive, toward the face on the front side of the cutter head 2. The additive injection portion 7a may be arranged on different rotation trajectories within the front side of the cutter head 2. This allows for more diversified injection control of the additive, so that the plastic fluidization of the excavated soil can be performed more accurately and efficiently. The additive injected from the additive injection portion 7a may be an air bubble material instead of a bentonite-based additive, or both a bentonite-based additive and an air bubble material may be used.

[0027] As shown in FIG. 1, the equipment body 3 includes a front body plate portion 3a (girder portion) and an aft body plate portion 3b (tail portion) provided behind the front body plate portion 3a.

[0028] The forward and aft plate sections 3a and 3b are equipped with cylindrical skin plates M1 and M2 made of, for example, steel. The skin plates M1 and M2 are hollow exterior bodies that form the outer shape of the equipment body 3 and form a hollow space for installing equipment and the like inside the equipment body 3. The forward and aft plate sections 3a and 3b are engaged with each other by inserting the tip of the skin plate M2 into the skin plate M1 while contacting the inner peripheral surface of the skin plate M1.

[0029] A tail seal portion 3bs is provided at the rear end of the skin plate M2 of the rear body plate portion 3b. The tail seal portion 3bs is a water-stopping mechanism that prevents groundwater, backfill grout, and the like from flowing into the inside of the equipment main body 3, and is provided along the circumferential direction of the skin plate M2 with the outer periphery of the tail seal portion 3bs in close contact with the inner periphery of the segment SG.

[0030] A bulkhead plate 8 is provided at a position receding from the front surface of the skin plate M1 of the front body plate portion 3a toward the inside of the equipment body 3, dividing the hollow space in the equipment body 3 into a face side and an inner side. The chamber 4 is provided on the face side of the bulkhead plate 8 (i.e., the space between the cutter head 2 and the bulkhead plate 8).

[0031] As shown in FIG. 1 and FIG. 4, a mixing rod (first mixing member) 9a is fixed to the front surface (chamber 4 side) of the partition plate 8. The mixing rod 9a is formed, for example, in a cylindrical shape and is provided in a state of protruding from the front surface of the partition plate 8 toward the chamber 4. On the other hand, as shown in FIG. 1 and FIG. 2, a mixing rod (second mixing member) 9b is fixed to the back surface of the spoke portion 2Sa of the cutter head 2. The mixing rod 9b is formed, for example, in a cylindrical shape and is provided in a state of protruding from the back surface of the cutter head 2 toward the chamber 4. The mixing rod 9b rotates and moves with the rotation of the cutter head 2. These mixing rods 9a, 9b have the function of mixing and stirring the soil, additive, and moisture in the chamber 4 when the cutter head 2 rotates. The mixing rod 9a may be structured so that the additive is injected from the tip of the mixing rod 9a.

[0032] As shown in Figures 1 and 4, on the inside of the machine than the partition plate 8, there are provided an additive injection section 7b (see Figure 3), an additive injection section 7c, an earth pressure gauge 10 (see Figure 3), a cutter driver 11, a center bending jack 12a, a shield jack 12b, a screw conveyor 13 and an erector 14 (see Figure 1), etc.

[0033] The additive injector 7b is a component that injects the additive into the chamber 4, and the additive injector 7c is a component that injects the additive around the outside of the device body 3. The additive injected from the additive injectors 7b and 7c is a mud-making material such as a bentonite-based additive. Note that, as the additive, an air bubble material may be used instead of the bentonite-based additive, or both the bentonite-based additive and the air bubble material may be used.

[0034] The earth pressure gauge 10 is a sensor unit that detects the pressure caused by the mud inside the chamber 4, and is installed with its detection surface facing the inside of the chamber 4. The earth pressure gauge 10 measures the mud pressure inside the chamber 4, and by controlling the measured value to be within a predetermined range, it is possible to proceed with the excavation process while ensuring the stability of the face.

[0035] The cutter driver 11 is a drive source for rotating the cutter head 2, and a plurality of cutter drivers 11 are arranged in a line along the circumferential direction of the cutter head 2 between the center and the outer periphery of the front surface of the cutter head 2. Note that an intermediate support drive system is exemplified here as the cutter drive system.

[0036] The articulating jacks 12a are devices that correct the advancing direction of the earth shield machine 1 by bending the earth shield machine 1, and a plurality of them are installed side by side along the circumferential direction of the earth shield machine 1 inside the equipment body 3. By supplying pressure oil to the articulating jacks 12a and advancing the earth shield machine 1 with the front body plate section 3a and the rear body plate section 3b bent in a predetermined direction and angle, it is possible to control the advancing direction of the earth shield machine 1.

[0037] The shield jack 12b is a device that generates a propulsion force for advancing the mud shield machine 1 by receiving a reaction force from the segment SG installed at the rear of the equipment main body 3, and multiple shield jacks are arranged in a line along the circumferential direction of the mud shield machine 1 within the equipment main body 3.

[0038] The screw conveyor 13 is a device for discharging the soil and sand taken into the chamber 4 to the outside of the machine, and is provided so as to penetrate the partition plate 8 from the chamber 4 and continuously extend obliquely upward toward the rear of the machine body 3. Here, for example, a ribbon-type screw conveyor 13 is used. That is, a spiral blade 13B without a rotating shaft is installed in the pipe of the screw conveyor 13 in a freely rotatable state.

[0039] The erector 14 is an assembly device that grasps the segment SG, rotates it in the inner circumferential direction of the excavation hole, and transports it to an assembly position in the inner circumferential direction of the excavation hole, and is installed in the hollow of the rear body plate section 3b in a state in which it can rotate along the circumferential direction of the excavation hole by a hydraulic motor (not shown) for driving the erector or the like.

[0040] Next, a structural example of the connecting rod portion CB constituting the above-mentioned spoke portion 2Sb will be described with reference to Figures 1, 3, 5, and 6. Figures 5(a) and 6(a) are enlarged plan views of the main part of the spoke portion of the cutter head in Figure 3, Figures 5(b) and (c) are side views of the spoke portion in Figure 5(a), and Figures 6(b) and (c) are side views of the spoke portion in Figure 6(a).

[0041] 1, 3, 5 and 6, the connecting rod portion CB constituting the spoke portion 2Sb is formed so that a part of it protrudes toward the chamber 4, and functions as a third kneading member that stirs, mixes, and kneads the excavated soil, additives, water, etc. that have entered the chamber 4. Here, the connecting rod portion CB is inclined so as to protrude toward the chamber 4 as it approaches the face plate portion FP, for example.

[0042] As described above, in an earth pressure shield machine, it is important to thoroughly mix the excavated soil, additives, water, etc. that have entered the chamber. However, depending on the shape of the earth pressure shield machine, it may not be possible to make the mixing blades large, which poses the problem of a significant reduction in the ability to mix the excavated soil, additives, water, etc.

[0043] In contrast to this, in the mud pressure shield machine 1 of this embodiment, a part of the spoke portion 2Sb that constitutes the cutter head 2 is given the function of kneading the excavated soil, additives, water, etc., so that even if the mixing blades cannot be made large, the mixing ability of the excavated soil, additives, water, etc. that have entered the chamber 4 can be improved.

[0044] The connecting rod portion CB is, for example, a rectangular or circular steel pipe. However, when the connecting rod portion CB is rectangular, the mixing ability of the excavated soil, additives, water, etc. can be further improved compared to when the connecting rod portion CB is circular.

[0045] In the earth pressure shield machine 1 of this embodiment, for example, connecting rod sections CB1, CB2 (CB) with two different inclination angles are installed in one cutter head 2. By providing multiple types of inclination angles for the connecting rod section CB in this way, it is possible to improve the mixing ability of the excavated soil, additives, water, etc., compared to a case in which the inclination angles of the multiple connecting rod sections CB are all the same.

[0046] 5(c), the inclination angle θ1 of the connecting rod portion CB1 (CB) is, for example, about 12.2°. Although not particularly limited, the length L1 of the connecting rod portion CB1 is, for example, about 750 mm, the radius R of the hub portion 2H is, for example, about 350 mm, and the thickness D of the hub portion 2H is, for example, about 400 mm.

[0047] On the other hand, as shown in Fig. 6(c), the inclination angle θ2 of the connecting rod portion CB2 (CB) is larger than the inclination angle θ1 of the connecting rod portion CB1, and is, for example, about 22.9°. Although not particularly limited, the length L2 of the connecting rod portion CB2 is longer than the length L1 of the connecting rod portion CB1, and is, for example, about 879.5 mm.

[0048] Furthermore, as shown in Fig. 3, in the earth pressure shield machine 1 of this embodiment, the connecting rod sections CB1 and CB2 are arranged alternately along the circumferential direction of the cutter head 2. This improves the mixing ability of the excavated soil, additives, water, etc., compared to a case in which connecting rod sections CB with the same inclination angle are arranged adjacent to each other along the circumferential direction of the cutter head 2. Note that although Fig. 3 is a plan view, the same hatching is used for connecting rod sections CB with the same inclination angle to make the drawing easier to see.

[0049] The invention made by the inventor has been specifically described above based on the embodiment, but the embodiment disclosed in this specification is illustrative in all respects and is not limited to the disclosed technology. In other words, the technical scope of the present invention should not be interpreted restrictively based on the description in the above embodiment, but should be interpreted strictly according to the description in the claims, and includes technologies equivalent to the described technologies in the claims and all modifications that do not deviate from the gist of the claims.

[0050] For example, in the above embodiment, the number of spokes 2Sb each having a connecting rod portion CB is four, but the present invention is not limited to this and may have, for example, five or more. However, when the connecting rod portion CB has a plurality of inclination angles, it is preferable that the number of spokes 2Sb each having a connecting rod portion CB is an even number.

[0051] Further, in the above embodiment, the case where the inclination angle of the connecting rod portion CB is set to two types has been exemplified, but this is not limiting, and for example, three or more types may be used. [Industrial Applicability]

[0052] The above explanation shows the application of the present invention to an earth pressure shield machine having a ribbon-type screw conveyor, but the present invention can also be applied to an earth pressure shield machine having an axis-mounted screw conveyor in which the shaft is at the center of the conveyor and blades are provided around the shaft. [Explanation of symbols]

[0053] 1. Muddy earth pressure shield tunneling machine 2 Cutter head (cutter plate) 2H Hub section (center) 2R Outer ring part (outer frame part) 2S spoke part 2Sa spokes 2Sb spoke part (connection part) 2A opening 3. Device body 3a Front fuselage plate 3b Rear fuselage plate 3bs Tail seal part 4. Chamber Bits 5a to 5d 6 Scraper Toss 7a~7c Additive injection part 8 Bulkhead version 9a Kneading rod (first kneading member) 9b Mixing rod (second mixing member) 10 Soil pressure gauge 11 Cutter driver 12a folding jack 12b Shield Jack 13 Screw conveyor 13B Blade 14 Erector CB Connecting rod part (first connecting part, third kneading part) FP Face plate (second connecting part) M1, M2 skin plate

Claims

1. a cutting machine comprising: a central portion supported on a front surface of a device body in a traveling direction in a state in which it can freely rotate along a circumferential direction of the device body and disposed in the center when viewed from the front; an outer peripheral frame portion consisting of a frame body having a circular shape when viewed from the front along an outer periphery of the device body; a plurality of spoke portions disposed between the central portion and the outer peripheral frame portion and spaced apart from each other along the circumferential direction of the outer peripheral frame portion, connecting the central portion and the outer peripheral frame portion; and a connecting portion disposed between adjacent spoke portions along the circumferential direction of the outer peripheral frame portion, the connecting portion including a first connecting portion extending from the central portion toward the outer peripheral frame portion and a second connecting portion attaching the first connecting portion to the outer peripheral frame portion; A partition wall portion provided to face the rear surface of the cutting board and close the opening of the device body; a chamber provided between a rear surface of the cutting board and a front surface of the partition; A first kneading member provided on the back surface of the cutter plate for stirring, mixing, and kneading the excavated soil and additives that have entered the chamber; A second kneading member is provided on the front surface of the partition wall at a position where it does not collide with the first kneading member when the cutter plate rotates, and stirs, mixes, and kneads the excavated soil and additives that have entered the chamber; Equipped with A mud pressure shield tunneling machine characterized in that a portion of the first connecting portion is formed so as to protrude toward the chamber side, and constitutes a third kneading member that stirs, mixes, and kneads the excavated soil and additives that have entered the chamber.

2. 2. The mud pressure shield machine according to claim 1, wherein the first connecting portion is inclined so as to protrude toward the chamber as it approaches the second connecting portion.

3. 3. The mud pressure shield machine according to claim 2, wherein the cutter plate has a plurality of different inclination angles of the first connecting portion.

4. 4. The mud pressure shield machine according to claim 3, wherein the inclination angles of the first connecting portions are different between adjacent first connecting portions.

5. 5. A mud pressure shield machine according to claim 1, wherein the second connecting portion is a face plate portion.

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