Shield tunneling machine

Abstract

To provide a shield tunneling machine capable of preventing a tail seal unit from degrading in water-stopping performance.SOLUTION: Multiple sealing members 12Ba and 12Bb placed along the inner circumference of a skin plate 5 of a shield tunneling machine 1 are segmented into sealing members 12Ba1 and 12Bb1 in an upper area Up, sealing members 12Ba2 and 12Bb2 in a lower area Un, and sealing members 12Ba3 and 12Bb3 in an intermediate area Md therebetween, and sealing members 12Ba4 and 12Bb4 in a lateral area Sd. The protrusion length of the sealing members 12Ba4 and 12Bb4 in the lateral area Sd is longer than the protrusion length of the sealing members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 of the upper area Up and the lower area Un. With this, the water-stopping performance of the tail seal unit 12 of the shield tunneling machine 1 is prevented from decreasing.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a shield tunneling machine, and more particularly to tail seal technology for a shield tunneling machine. [Background technology]

[0002] When excavating the ground with a shield machine, a water-stopping structure called a tail seal is provided at the rear end of the shield machine to prevent groundwater and soil from seeping into the shield machine through the gap between the segment at the rear end of the shield machine and the skin plate of the shield machine, or to prevent backfill material pressed into the ground from seeping in.

[0003] This tail seal section has multiple seal members arranged along the inner periphery of the skin plate. Each seal member has, for example, two springy steel plates and a wire brush (a brush-type brush made of a bundle of fine steel wires) arranged between the two steel plates. During shield excavation, the wire brushes of the seal members come into contact with the segments, and a sealing agent such as waterproof grease is supplied to the wire brushes themselves and the contact areas between the wire brushes and the segments, thereby maintaining waterproofing.

[0004] The tail seal portion is described, for example, in Patent Document 1, which discloses a configuration in which the seal member is divided into upper, middle, and lower sections along the circumferential direction of the skin plate, and the thickness of the rubber seal member is different on the upper, middle, and lower sections.

[0005] Furthermore, for example, Patent Document 2 discloses a configuration in which the sealing member is divided into upper, middle and lower sections along the circumferential direction of the skin plate, and the deformation characteristics of the rubber sealing member are different for the upper, middle and lower sections.

[0006] Furthermore, for example, Patent Document 3 discloses a configuration in which the height of the seal member can be adjusted by changing the shape of the wire brush that constitutes the seal member of the tail seal portion between straight and curved. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Jikko No. 54-25300 [Patent Document 2] Jikko No. 54-25301 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-87531 Summary of the Invention [Problem to be solved by the invention]

[0008] In recent years, with the shield tunneling method, tunnels have become longer and longer, and various problems have occurred, such as malfunctions in the segments and abnormal increases in thrust, due to deterioration or damage to the sealing material in the tail seal (deformation of the sealing material itself, or loss or deformation of the wire brushes, etc.). Furthermore, tunnels are becoming deeper, and construction under high water pressure is becoming more common, which has led to problems such as the sealing material in the tail seal being turned over by water pressure. Therefore, with the shield tunneling method, it is important to design tail seals that will prevent the above-mentioned problems from occurring during excavation.

[0009] Here, according to the inventor's research, it was found that when the shield tunneling machine is moved in a curve, the clearance (spacing) between the inner circumference of the skin plate on the outer side of the shield tunneling machine and the outer circumference of the segment becomes larger than the clearance (distance) between the inner circumference of the skin plate on the inner side of the shield tunneling machine and the outer circumference of the segment, and the watertightness of the tail seal part of the shield tunneling machine is reduced.

[0010] In other words, when the shield construction line has right or left curves, the left-right clearance between the segment and the skin plate repeatedly widens and narrows.If the seal material remains crushed at this time, there is a possibility of water leaking between the segment and the skin plate, so it is necessary to increase the restoring force of the seal material so that it can follow the segment even when the clearance becomes large.

[0011] The present invention has been made in light of the above-mentioned technical background, and has as its object to prevent a decrease in the watertightness of the tail seal portion of a shield tunneling machine. [Means for solving the problem]

[0012] In order to solve the above problems, the shield tunneling machine of the present invention described in claim 1 comprises a cutter head for excavating the ground, an equipment body for rotatably supporting the cutter head, a skin plate forming the outer shell of the equipment body, and a tail seal portion provided between the inner periphery of the skin plate and the outer periphery of a segment provided on the rear end side of the equipment body, wherein the tail seal portion has a plurality of plate-shaped seal members provided along the inner periphery of the skin plate, the seal members having spring properties, and one end side of the seal members in the front-rear direction of the equipment body is fixed to the skin plate, and the other end side of the seal members in the front-rear direction is provided in contact with the outer periphery of the segment,

[0013] The multiple sealing members arranged along the inner circumference of the skin plate consist of sealing members in the left and right side regions, a sealing member in an upper region above the side regions, a sealing member in a lower region below the side regions, and a sealing member in an intermediate region between the upper region, the lower region and the side regions, and the length of the protruding portion protruding from the fixing portion of the sealing member in at least either the left or right side region toward the segment is longer than the length of the protruding portion protruding from the fixing portion of the sealing member in the upper region and the lower region toward the segment.

[0014] The shield tunneling machine of the present invention described in claim 2 is characterized in that, in the invention described in claim 1, the length of the protruding portion protruding from the fixing portion of the sealing member in the middle region toward the segment is gradually increased from the protruding length in the lower region and the upper region toward the protruding length in the side region.

[0015] The shield tunneling machine of the present invention described in claim 3 is characterized in that, in the invention described in claim 1 above, the length of the protruding portion protruding from the fixing portion of the sealing member in the intermediate region toward the segment is increased for each block of the sealing member in the intermediate region, from the protruding length in the lower region and the upper region toward the protruding length in the side region.

[0016] The shield tunneling machine of the present invention described in claim 4 is characterized in that, in the invention described in claim 2 above, the spring force of the sealing member in the side region is stronger than the spring force of the sealing members in the upper region and the lower region.

[0017] The shield tunneling machine of the present invention described in claim 5 is characterized in that, in the invention described in claim 4 above, the sealing member has a springy steel plate portion fixed in a cantilevered state to the skin plate, and the number of steel plates in the steel plate portion of the sealing member in the side region is greater than the number of steel plates in the steel plate portion of the sealing member in each of the upper region and the lower region.

[0018] The shield tunneling machine of the present invention described in claim 6 is characterized in that, in the invention described in claim 4 above, the sealing member has a springy steel plate portion fixed in a cantilevered state to the skin plate, and the thickness of the steel plate of the steel plate portion of the sealing member in the side region is thicker than the steel plate of the steel plate portion of the sealing member in each of the upper region and the lower region.

[0019] The shield tunneling machine of the present invention described in claim 7 is characterized in that, in the invention described in any one of claims 1 to 6 above, the side region is set to one-sixth to one-third of the total circumferential length of the skin plate.

[0020] The shield tunneling machine of the present invention described in claim 8 is characterized in that, in the invention described in any one of claims 1 to 6 above, the upper region is set to the upper one-sixth of the total circumference of the skin plate, the lower region is set to the lower one-sixth of the total circumference of the skin plate, and the side regions are set to the left and right one-sixth of the total circumference of the skin plate. [Effects of the Invention]

[0021] According to the present invention, it is possible to prevent a decrease in the watertightness of the tail seal portion of a shield tunneling machine. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a diagram showing the main components of a shield tunneling machine according to an embodiment of the present invention, seen from the side. FIG. [Figure 2] This is a schematic diagram of the inside of a shield tunneling machine seen from above. [Figure 3] FIG. 2 is a rear view of the shield tunneling machine of FIG. 1 as seen from the rear. [Figure 4] (a) is a perspective view of the main components of the sealing members in the upper and lower regions and the side regions, and (b) is a perspective view of the main components of the sealing members in the upper, lower, side, and middle regions, seen from the side. [Figure 5] 2(a) is a side view of the tail seal portion in the upper region of the shield tunneling machine in FIG. 1, and FIG. 2(b) is a front view of the seal member that constitutes the tail seal portion of FIG. 2(a) as seen from the rear of the shield tunneling machine. [Figure 6] FIG. 6 is a side view showing an example of the protrusion length of the seal member of FIG. 5(a). [Figure 7] 1(a) is a side view of the tail seal portion with the sealant supply pipe added, and FIG. 1(b) is a cross-sectional view taken along line II in FIG. [Figure 8] FIG. 10 is a plan view of a group of essential parts of the tail seal portion. [Figure 9]FIG. 4 is a rear view of a shield tunneling machine according to a second embodiment of the present invention, as seen from the rear. DETAILED DESCRIPTION OF THE INVENTION

[0023] 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 repeated description thereof will be omitted.

[0024] (First embodiment)

[0025] First, an example of the configuration of a shield tunneling machine according to this embodiment will be described with reference to Fig. 1. Fig. 1 is a configuration diagram of the main parts of the inside of the shield tunneling machine according to this embodiment, seen through from the side.

[0026] The shield tunneling machine 1 of this embodiment is a mud pressure type shield machine that excavates while ensuring the stability of the face by filling the chamber 4 between the cutter head 2 and the equipment body 3 with mud that is impermeable and has plastic fluidity (the ability to deform and move freely) created by injecting additives into the soil and sand excavated by the cutter head 2 and mixing it, thereby generating mud pressure that counteracts the earth pressure at the face and ensuring the stability of the face.

[0027] The cutter head 2 is a shield cutter machine that excavates the ground, and is installed in front of the tip head of the shield tunneling machine 1 in a state where it can rotate forward and backward along the circumferential direction of the equipment body 3. Although not particularly limited, the diameter of the cutter head 2 is, for example, about 2320 mm.

[0028] A center bit CB, a bit B, and scraper teeth (not shown) are attached to the front surface of the cutter head 2 (the surface facing the working face). The center bit CB and bit B are excavation components that mainly cut away the natural ground, and the scraper teeth are cutting components that mainly cut the natural ground. Note that instead of the bit B, for example, a roller cutter or the like may be attached.

[0029] A copy cutter CC is also installed on the outer periphery of the cutter head 2. The copy cutter CC is responsible for over-excavating when constructing sharp curves and controlling the attitude of the shield machine 1. A plurality of stirring rods SB are attached to the center of the rear surface of the cutter head 2. The stirring rods SB are formed, for example, from cylindrical protruding members, and have the role of stirring and mixing the soil and additives in the chamber 4 when the cutter head 2 rotates. The stirring rods SB are, for example, equipped with a vibration sensor.

[0030] The equipment body 3 is the main component that drives the shield machine 1. The equipment that drives the shield machine 1 is surrounded and protected by a skin plate 5 that forms the outer shell of the equipment body 3. The skin plate 5 has a forward body plate (forward body section) 5a and an aft body plate (aft body section) 5b behind it. The forward body plate 5a and the aft body plate 5b are made of, for example, cylindrical steel plates, and are engaged by inserting a spherical bearing at the tip of the aft body plate 5b into the forward body plate 5a while in contact with the inner circumferential surface.

[0031] The hollow space within the skin plate 5 is divided into a face side and an inboard side by a bulkhead 7 provided inside the front body plate 5a. The chamber 4 described above is provided on the face side (i.e., between the cutter head 2 and the bulkhead 7). Note that earth and sand excavated by the cutter head 2 is taken into the chamber 4 through a through-hole (not shown) that penetrates the front and back surfaces of the cutter head 2.

[0032] Meanwhile, inside the hollow space of the skin plate 5, there are installed a cutter driver 8, a center bending jack 9a, a shield jack 9b, a screw conveyor 10, an erector 11, and a tail seal unit 12. Although not shown, in addition to the above, the main body 3 is also equipped with various other devices, such as an earth pressure detection unit that detects the earth pressure in the chamber 4, and an additive injection unit that injects the additive (earth-making material) into the chamber 4.

[0033] The cutter drivers 8 are motors (drive sources) that rotate the cutter head 2 in forward and reverse directions, and a plurality of them are installed in a line near the outer periphery inside the front of the cutter head 2 along the circumferential direction of the cutter head 2. Note that a periphery support drive system is exemplified here as the cutter drive system.

[0034] The articulating jacks 9a are devices that correct the forward movement direction and attitude of the shield machine 1, and are installed in multiple rows along the circumferential direction of the machine body 3, straddling the boundary between the front and rear plates 5a and 5b so as to connect the front and rear plates 5a and 5b within the machine body 3. By supplying pressure oil to these articulating jacks 9a and advancing the shield machine 1 with the front and rear plates 3a and 3b bent in a predetermined direction and angle, it is possible to control the forward movement direction and attitude of the shield machine 1.

[0035] The shield jack 9b is a device that generates a propulsion force to move the shield tunneling machine 1 forward by receiving a reaction force from the segment SG installed at the rear of the equipment main body 3, and multiple shield jacks 9b are installed in a row along the circumferential direction of the equipment main body 3, straddling the boundary between the front body plate 5a and the rear body plate 5b within the equipment main body 3.

[0036] The screw conveyor 10 is a device for discharging the soil and sand taken into the chamber 4 to the outside of the machine, and is installed so as to extend continuously from the chamber 4 through the partition wall 7 and diagonally upward toward the rear. Note that a ribbon screw conveyor is shown as an example here.

[0037] The erector 11 is an assembly device that grasps the segment SG, rotates it in the direction of the inner circumference of the excavation hole, and transports it to an assembly position in the direction of the inner circumference of the excavation hole, and is installed in the hollow of the rear body plate 5b in a state that allows it to rotate in the direction of the circumference of the excavation hole by a hydraulic motor (not shown) for driving the erector, etc.

[0038] The tail seal portion 12 is provided between the inner circumference of the skin plate 5 and the outer circumference of the segment SG, and is a water-stopping structure that prevents groundwater, soil and backfill material, etc. (hereinafter referred to as groundwater, etc.) from entering the interior of the equipment main body 3 from the outside of the rear end side of the shield tunneling machine 1 during excavation operations, and has two-stage plate-shaped seal members 12Ba, 12Bb with spring properties, and a seal chamber 12R provided between these seal members 12Ba, 12Bb.

[0039] The seal members 12Ba, 12Bb are installed, for example, at two locations on the inner periphery of the rearmost end of the skin plate 5, spaced apart from each other along the fore-and-aft direction of the shield machine 1 (the direction of the central axis of the shield machine 1, the extension direction of the excavation hole), and each seal member 12Ba, 12Bb is installed in a ring-shaped arrangement along the inner periphery of the skin plate 5 so as to surround the outer periphery of the segment SG. The number of seal members installed is not limited to two, and they may be installed at three or more locations along the fore-and-aft direction of the shield machine 1, for example.

[0040] Furthermore, each of the seal members 12Ba, 12Bb is installed in a cantilevered state on the inner periphery of the skin plate 5. That is, one end side of each of the seal members 12Ba, 12Bb (one end side in the front-rear direction of the device body 3) is fixed to the inner periphery of the skin plate 5, and is bent in an inclined state toward the segment SG between one end side and the other end side (the other end side in the front-rear direction of the device body 3) of the seal members 12Ba, 12Bb, and further, the other end side of the seal members 12Ba, 12Bb is pressed against the segment SG by the spring force of the seal members 12Ba, 12Bb and is in contact with the segment SG.

[0041] Additionally, a sealing agent supply pipe 14 is installed on the outer periphery of the rear body plate 5b. The sealing agent supply pipe 14 is a pipe for supplying a sealing agent such as grease to the sealing chamber 12R, and multiple sealing agent supply pipes 14 are installed on the outer periphery of the rear body plate 5b. By filling the sealing chamber 12R with sealing agent through this sealing agent supply pipe 14, the gap between the inner periphery of the skin plate 5 and the outer periphery of the segment SG is sealed, and in combination with sealing members 12Ba and 12Bb, groundwater and the like are prevented from entering the interior of the shield machine 1 during excavation work.

[0042] Furthermore, a backfilling material supply passage (not shown) is installed on the outer wall of the rear body plate 5b. The backfilling material supply passage is a pipe for supplying backfilling material, such as a cement-based hardening or solidifying material, to the gap between the excavation hole behind the skin plate 5 and the segment SG. By filling the gap between the excavation hole and the segment SG with backfilling material, ground subsidence is prevented, and further, the segment SG and the natural ground are integrated, preventing water leakage from the joints of the segment SG.

[0043] Furthermore, the backfilling material supply passages are provided, for example, at two locations on either side of the top of the skin plate 3. While the sealant supply passages 14 are provided at multiple locations on the outer periphery of the skin plate 5, the backfilling material supply passage is only provided near the top of the skin plate 5. This is because the sealant has high viscosity and must be supplied evenly around the inner periphery of the skin plate 5 in order to adhere to the outer periphery of the segment SG, whereas the backfilling material has low viscosity and so if it is supplied near the top of the skin plate 5, it will flow under its own weight to the lower outer periphery of the segment SG.

[0044] The locations and numbers of the sealant supply channels 14 and backfilling material supply channels are not limited to those described above. For example, more sealant supply channels 14 may be provided, and the backfilling material supply channel may be provided at only one location on the top of the skin plate 5 in the axial direction.

[0045] Next, we will explain the issues with shield tunneling and configuration examples that solve these issues with reference to Figures 2 to 4. Figure 2 is a schematic configuration diagram showing the inside of a shield tunneling machine as seen from above, and Figure 3 is a rear view of the shield tunneling machine of Figure 1 as seen from behind. Note that the symbols X and Y in Figure 3 represent the X-axis and Y-axis, respectively. For ease of explanation, Figure 3 also shows the symbols for the front-stage sealing members 12Ba (12Ba1, 12Ba2, 12Ba3, 12Ba4).

[0046] According to the inventor's research, it has been found that, as shown in Figure 2, when the shield tunneling machine 50 is moved in a curve while a segment 51 is placed behind the shield tunneling machine 50, the clearance (distance) D2 between the inner circumference of the skin plate 52 on the outer side of the shield tunneling machine 50 and the outer circumference of the segment 51 becomes larger than the clearance (spacing) D1 between the inner circumference of the skin plate 52 on the inner side of the shield tunneling machine 50 and the outer circumference of the segment 51, and the watertightness of the tail seal portion of the shield tunneling machine 50 decreases.

[0047] Therefore, in this embodiment, as shown in Figure 3, the multiple sealing members 12Ba, 12Bb arranged along the inner circumference of the skin plate 5 consist of sealing members 12Ba1, 12Bb1 in the upper region Up, sealing members 12Ba2, 12Bb2 in the lower region Un, sealing members 12Ba3, 12Bb3 in the intermediate region Md between them, and sealing members 12Ba4, 12Bb4 in the side regions Sd arranged between the intermediate regions Md.

[0048] Here, although not particularly limited, the up-down angle Rx1 is set to, for example, 60°, the upper region Up is set to, for example, the upper sixth of the entire circumferential length of the skin plate 5, and the lower region Un is set to, for example, the lower sixth of the entire circumferential length of the skin plate 5. As a specific example, when the skin plate 5 is viewed from the rear, the upper region Up is in the range from 11 o'clock to 1 o'clock, and the lower region Un is in the range from 5 o'clock to 7 o'clock.

[0049] Although not particularly limited, the left and right angle Rx2 is set to, for example, 60°, and the left and right side regions Sd are set to, for example, one-sixth of the entire perimeter of the skin plate 5. As a specific example, when the skin plate 5 is viewed from the rear, the side regions Sd are in the ranges of 2 o'clock to 4 o'clock and 8 o'clock to 10 o'clock.

[0050] In this embodiment, the length (protrusion length) of the protruding portions protruding toward the segment SG in the sealing members 12Ba4, 12Bb4 in the side regions Sd, Sd on both the left and right sides of the shield tunneling machine 1 is longer than the length (protrusion length) of the protruding portions protruding toward the segment SG in the sealing members 12Ba1, 12Ba2, 12Bb1, 12Bb2 in the upper region Up and lower region Un.

[0051] As a result, even if the clearance D2 (see Figure 2) between the inner circumference of the skin plate 5 on the outer side of the shield machine 1 and the outer circumference of the segment SG is larger than the clearance D1 (see Figure 2) between the inner circumference of the skin plate 5 on the inner side of the shield machine 1 and the outer circumference of the segment SG, the engagement allowance of the protruding portions of the sealing members 12Ba4, 12Bb4 in the side regions Sd, Sd (the length over which the sealing members 12Ba, 12Bb engage the segment SG) can be sufficiently secured, and the protruding portions of the sealing members 12Ba4, 12Bb4 in the side regions Sd, Sd can be firmly pressed against the outer circumference of the segment SG, thereby preventing a decrease in the watertightness of the tail seal portion 12 of the shield machine 1.

[0052] As shown in Figure 2, if there is a right curve, the clearance between the left segment SG and the skin plate 5 will be wider, and if there is only a left curve, the clearance between the right segment SG and the skin plate 5 will be wider. Therefore, depending on the linearity of the shield construction, if there are left and right curves, both may be made longer, or if there is a left or right curve, only one side may be made longer. In other words, it is sufficient that the length of the seal members 12Ba4, 12Bb4 in at least either the left or right side region Sd, Sd (i.e., either the left or right, or both the left and right) is longer.

[0053] In addition, in this embodiment, an intermediate region Md is provided between the upper region Up and the lower region Un and the side regions Sd, Sd, and the protrusion length of the sealing members 12Ba3, 12Bb3 in the intermediate region Md is set to gradually increase from the upper region Up and the lower region Un toward the side regions Sd, Sd so as to blend in with the relatively short protrusion length of the sealing members 12Ba1, 12Ba2, 12Bb1, 12Bb2 in the upper region Up and the lower region Un and the relatively long protrusion length of the sealing members 12Ba4, 12Bb4 in the side regions Sd, Sd.

[0054] 4(a) is a perspective view of the main components of the seal members in the upper and lower regions and the side regions, and FIG. 4(b) is a perspective view of the main components of the seal members in the upper, lower, side, and middle regions, as seen from the side. In FIG. 4(b), the seal members 12Ba3 and 12Bb3 in the middle region Md are hatched for ease of viewing.

[0055] 4(a), when the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba4, and 12Bb4 in the upper region Up, lower region Un, and side region Sd are pressed against the segment SG, the protruding portions of the sealing members 12Ba4 and 12Bb4 in the side region Sd are relatively long and have a large overlap, forming an acute angle, whereas the protruding portions of the sealing members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 in the upper region Up and lower region Un are relatively short and have a small overlap, forming an obtuse angle. As a result, gaps Gp are formed between the sealing members 12Ba4 and 12Bb4 in the side region Sd and the sealing members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 in the upper region Up and lower region Un in a side view, which may allow groundwater or the like to seep into the device body 3.

[0056] 4(b), in this embodiment, the seal members 12Ba3 and 12Bb3 in the middle region Md are provided between the seal members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 in the upper region Up and the lower region Un and the seal members 12Ba4 and 12Bb4 in the side region Sd. The protrusion lengths of the seal members 12Ba3 and 12Bb3 in the middle region Md are gradually increased from the upper region Up and the lower region Un toward the side region Sd so that the protrusion lengths of the seal members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 in the upper region Up and the lower region Un approach the protrusion lengths of the seal members 12Ba4 and 12Bb4 in the side region Sd.

[0057] As a result, sealing members 12Ba3 and 12Bb3 of middle region Md are interposed between sealing members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 of upper region Up and lower region Un and sealing members 12Ba4 and 12Bb4 of side region Sd, preventing gaps Gp (see FIG. 4(a)) from occurring, thereby preventing groundwater and the like from entering the inside of equipment body 3 through gaps Gp. This prevents a decrease in the watertightness of tail seal portion 12 of shield machine 1.

[0058] In this embodiment, the spring force of the seal members 12Ba4 and 12Bb4 in the side regions Sd is set to be stronger than the spring force of the seal members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 in the upper region Up and the lower region Un. That is, the conformability of the seal members 12Ba4 and 12Bb4 in the side regions Sd is set to be higher than the conformability of the seal members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 in the upper region Up and the lower region Un.

[0059] This improves the mechanical strength of the seal members 12Ba4, 12Bb4 in the side regions Sd, which are susceptible to deformation pressure when the shield machine 1 moves along a curve, thereby suppressing or preventing deterioration or damage to the seal members 12Ba4, 12Bb4 in the side regions Sd. Furthermore, the spring force of the seal members 12Ba4, 12Bb4 in the side regions Sd allows the seal members 12Ba4, 12Bb4 in the side regions Sd to be firmly pressed against the segments SG. This prevents a decrease in the watertightness of the tail seal portion 12 of the shield machine 1.

[0060] Next, examples of the configuration of the seal members 12Ba, 12Bb that constitute the tail seal portion 12 of the shield machine 1 of this embodiment will be described with reference to Figs.

[0061] First, Figure 5(a) is a side view of the tail seal section in the upper region of the shield machine in Figure 1, and Figure 5(b) is a front view of the seal members that make up the tail seal section in Figure 5(a) as seen from the rear of the shield machine. Note that dashed line S1 indicates the outer peripheral position of the segments when they are planned for assembly, and dashed line S2 indicates the outer peripheral position of the segments when they are fully lowered. Furthermore, lengths Lc1 and Lc2 indicate the overlapping distance of seal members 12Ba and 12Bb over the segments. As mentioned above, the overlapping distance is the length over which seal members 12Ba and 12Bb overlap segments SG. Note that if the overlapping distance is too short, there is a risk that seal members 12Ba and 12Bb will be pushed over by water pressure and tip over.

[0062] The sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, 12Bb4 (12Ba, 12Bb) of the upper region Up, lower region Un, middle region Md and side region Sd are installed at one end side on the inner periphery of the skin plate 5 in a cantilevered state.

[0063] The length Ld between adjacent seal members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, and 12Bb4 (12Ba and 12Bb) is, for example, about 187 mm. The length Ls of the fixing portions of seal members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, and 12Bb4 (12Ba and 12Bb) is, for example, about 110 mm.

[0064] The outer inclination angle R1 of each of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, and 12Bb4 (12Ba and 12Bb) is, for example, about 50°, and the inner inclination angle R2 is, for example, about 30°. Note that these dimensions and angles are not limited to those described above and can be changed in various ways.

[0065] Here, each of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3 in the upper region Up, lower region Un and middle region Md has, for example, a steel plate portion (first steel plate portion) P1, a steel plate portion (second steel plate portion) P2 arranged inward and away from the steel plate portion P1, a wire mesh portion M arranged between them, and a brush portion Br arranged between the steel plate portions P1, P2 and the wire mesh portion M.

[0066] Each of the steel plate portions P1 and P2 of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, and 12Bb3 includes, for example, a single steel plate. The steel plates of the steel plate portions P1 and P2 are made of, for example, carbon tool steel and function as leaf springs. The leaf spring action of the steel plates presses the protruding portions of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, and 12Bb3 against the segments SG.

[0067] The thickness of each of the steel plate portions P1 and P2 is, for example, about 1.0 mm. The planar shape of the steel plate portions P1 and P2 is, for example, rectangular, as shown in FIG. 5(b).

[0068] On the other hand, each of the sealing members 12Ba4, 12Bb4 in the side region Sd has, for example, a steel plate portion (third steel plate portion) P3, a steel plate portion (fourth steel plate portion) P4 arranged inward and away from the steel plate portion P3, a wire mesh portion M and an intermediate steel plate portion (not shown) arranged between them, and a brush portion Br arranged between the steel plate portions P3, P4 and the wire mesh portion M and the intermediate steel plate portion.

[0069] The steel plate portion P3 of the seal members 12Ba4, 12Bb4 may include, for example, three steel plates. The steel plate portion P4 of the seal members 12Ba4, 12Bb4 may include, for example, one steel plate. Furthermore, the intermediate steel plate portion between the steel plate portions P3, P4 may include, for example, two steel plates. The steel plates of the steel plate portions P3, P4 and the intermediate steel plate portion may be made of, for example, carbon tool steel and may function as leaf springs. The leaf spring action of the steel plates presses the protruding portions of the seal members 12Ba4, 12Bb4 against the segments SG.

[0070] The thickness of the steel plate of the steel plate portions P3 and P4 is, for example, about 1.0 mm, and the thickness of the steel plate of the intermediate steel plate portion is, for example, about 0.5 mm. The planar shape of the steel plate of the steel plate portions P3 and P4 and the intermediate steel plate portion is, for example, rectangular, as shown in FIG. 5(b).

[0071] In this embodiment, the number of steel plates of the sealing members 12Ba4, 12Bb4 in the side region Sd is greater than the number of steel plates of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, and 12Bb3 in the upper region Up, lower region Un, and middle region Md. This allows the spring force of the sealing members 12Ba4, 12Bb4 in the side region Sd to be stronger than the spring force of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, and 12Bb3 in the upper region Up, lower region Un, and middle region Md.

[0072] This improves the spring force of the seal members 12Ba4, 12Bb4 in the side regions Sd, which are susceptible to deformation pressure when the shield machine 1 moves along a curve, thereby suppressing or preventing deterioration or damage to the seal members 12Ba4, 12Bb4 in the side regions Sd. Furthermore, the spring force of the seal members 12Ba4, 12Bb4 in the side regions Sd allows the seal members 12Ba4, 12Bb4 in the side regions Sd to be firmly pressed against the segments SG. This prevents a decrease in the watertightness of the tail seal portion 12 of the shield machine 1. The conformability of the seal members 12Ba4, 12Bb4 in the side regions Sd to the segments SG is higher than the conformability of the seal members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3 in the upper region Up, lower region Un, and middle region Md to the segments SG.

[0073] However, the number, thickness, material, planar shape, etc. of the steel plates of the steel plate portions P1 to P4 are not limited to those described above and can be changed in various ways.

[0074] For example, the number of steel plates in the steel plate portion P3 constituting the seal members 12Ba4, 12Bb4 in the side regions Sd is not limited to three, and may be two or four or more. Also, the steel plate portion P3 may have one steel plate and the steel plate portion P4 may have two or more steel plates. Also, the number of steel plates in both the steel plate portions P3 and P4 may be two or more.

[0075] In addition, the thickness of the steel plate of the steel plate portions P3, P4 constituting the sealing members 12Ba4, 12Bb4 in the side region Sd may be thicker than the thickness of the steel plate of the steel plate portions P1, P2 constituting the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3 in the upper region Up, lower region Un and middle region Md.

[0076] In addition, the steel plate of the steel plate portions P3, P4 may be made of a metal material different from the material of the steel plate of the steel plate portions P1, P2 so that the spring force of the steel plate of the steel plate portions P3, P4 constituting the sealing members 12Ba4, 12Bb4 in the side region Sd is greater than the spring force of the steel plate of the steel plate portions P1, P2 constituting the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3 in the upper region Up, lower region Un and middle region Md.

[0077] Furthermore, the number of steel plates in the intermediate steel plate portion constituting the seal members 12Ba4, 12Bb4 in the side regions Sd is not limited to two, and may be, for example, one or three or more. Furthermore, a wire mesh portion M or a brush portion Br may be interposed between the steel plates in the intermediate steel plate portion. Furthermore, the thickness of the steel plate in the intermediate steel plate portion may be the same as the thickness of the steel plates in the steel plate portions P1 to P4. Furthermore, the steel plate in the intermediate steel plate portion may be made of a different metal material than the steel plates in the steel plate portions P1 to P4.

[0078] Furthermore, if the number of steel plates in the steel plate portions P3 and P4 constituting the sealing members 12Ba4 and 12Bb4 in the side region Sd is greater than the number of steel plates in the steel plate portions P1 and P2 constituting the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3 and 12Bb3 in the upper region Up, lower region Un and middle region Md, the middle steel plate portion may be eliminated.

[0079] Furthermore, when an intermediate steel plate portion is provided in the sealing members 12Ba4, 12Bb4 in the side region Sd, the number of steel plates in each of the steel plate portions P3, P4 constituting the sealing members 12Ba4, 12Bb4 in the side region Sd may be the same as the number of steel plates in each of the steel plate portions P1, P2 constituting the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3 in the upper region Up, lower region Un and middle region Md.

[0080] Next, for example, two sheet-like wire meshes are provided in the wire mesh portions M of the seal members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, 12Bb4 (12Ba, 12Bb) in the upper region Up, lower region Un, middle region Md and side region Sd.

[0081] The sheet-like wire mesh of the wire mesh section M is made by weaving thin wires made of stainless steel into a mesh shape, and has a thickness of, for example, about 0.5 mm. The planar shape of the sheet-like wire mesh of the wire mesh section M is, for example, rectangular, which is approximately the same as the planar shape of the steel plates of the steel plate sections P1 and P2. The number, thickness, material, and planar shape of the wire mesh of the wire mesh section M are not limited to those described above and can be changed in various ways.

[0082] The brush portions Br of the seal members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, 12Bb4 (12Ba, 12Bb) in the upper region Up, lower region Un, middle region Md, and side region Sd are made of, for example, wire brushes. That is, the brush portions Br are made by bundling together multiple wires extending in the fore-and-aft direction of the shield machine 1.

[0083] The wires of the brush part Br are made of, for example, hard steel wires and function as springs, so that the protruding portions of the seal members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, and 12Bb4 are pressed against the segments SG by the spring action of the wires.

[0084] The overall planar shape of the brush part Br is formed, for example, in a rectangular shape, which is approximately the same as the planar shape of the steel plates of the steel plate parts P1 to P4. Note that the material and planar shape of the brush part Br are not limited to those described above and can be variously changed. For example, in order to make the spring force of the sealing members 12Ba4, 12Bb4 in the side region Sd greater than the spring force of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, 12Bb4 in the upper region Up, lower region Un and middle region Md, the number of wires in the brush parts Br constituting the sealing members 12Ba4, 12Bb4 in the side region Sd may be greater than the number of wires in the brush parts Br constituting the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, 12Bb4 in the upper region Up, lower region Un and middle region Md.

[0085] Next, FIG. 6 is a side view showing an example of the protrusion length of the seal member of FIG. 5(a).

[0086] The protrusion length Lp1 of the seal members 12Ba1 and 12Ba2 at the front of the upper region Up and the lower region Un is, for example, about 200 mm. The protrusion length Lp2 of the seal members 12Bb1 and 12Bb2 at the rear of the upper region Up and the lower region Un is, for example, about 250 mm.

[0087] The protrusion length Lp1 of the front seal member 12Ba4 in the side region Sd is longer than the protrusion lengths of the front seal members 12Ba1 and 12Ba2 in the upper region Up and lower region Un, and is, for example, about 250 mm. The outward protrusion length Lp2 of the rear seal member 12Bb4 in the side region Sd is longer than the protrusion lengths of the rear seal members 12Bb1 and 12Bb2 in the upper region Up and lower region Un, and is, for example, about 300 mm.

[0088] The protrusion lengths Lp1, Lp2 of the seal members 12Ba3, 12Bb3 in the middle region Md are set to increase, for example, by 5 mm from the upper region Up and the lower region Un toward the side region Sd. That is, the protrusion length Lp1 of the seal member 12Ba3 in the middle region Md is set, for example, between 205 mm and 245 mm in increments of 5 mm, and the protrusion length Lp2 of the seal member 12Bb3 in the middle region Md is set, for example, between 255 mm and 295 mm in increments of 5 mm.

[0089] In addition, the protrusion lengths Lp1, Lp2 of the sealing members 12Ba3, 12Bb3 in the middle region Md, which increase from the upper region Up and the lower region Un toward the side region Sd, need only gradually (continuously) increase, and are not limited to the dimensions of 5 mm shown in this embodiment.

[0090] The protrusion lengths Lp1, Lp2 of the seal members 12Ba3, 12Bb3 in the intermediate region Md are set, for example, to be longer for each adjacent seal member 12B3, 12Bb3 along the inner periphery of the skin plate 5. However, this is not limited to this, and for example, the protrusion lengths Lp1, Lp2 of the seal members 12Ba3, 12Bb3 in the intermediate region Md may be increased for each block of seal members 12B3, 12Bb3 arranged along the inner periphery of the skin plate 5.

[0091] The protrusion lengths Lp1 and Lp2 of the seal members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, and 12Bb4 (12Ba and 12Bb) are not limited to the above values ​​and can be changed in various ways.

[0092] Next, FIG. 7(a) is a side view of the tail seal portion with a sealing agent supply pipe added, and FIG. 7(b) is a cross-sectional view taken along line II in FIG. 7(a).

[0093] A communication hole 14h that communicates the sealant supply pipe 14 with the sealing chamber 12R is formed in the skin plate 5 (rear body plate 5b). That is, the sealant supply pipe 14 is connected to the sealing chamber 12R through the communication hole 14h. The sealing agent SL that flows through the sealant supply pipe 14 is supplied into the sealing chamber 12R through the communication hole 14h, as shown by the arrow.

[0094] Next, FIG. 8 is a plan view of a group of essential parts of the tail seal portion.

[0095] A plurality of sealing members 12Ba1, 12Ba2, 12Ba3, and 12Ba4 are arranged side by side along the inner periphery (vertical direction in FIG. 8) of the skin plate 5 (rear body plate 5b). Adjacent sealing members 12Ba1, 12Ba2, 12Ba3, and 12Ba4 are arranged along the inner periphery of the skin plate 5 such that both sides of each sealing member in the width direction (circumferential direction of the skin plate 5) partially overlap each other.

[0096] Similarly, a plurality of seal members 12Bb1, 12Bb2, 12Bb3, and 12Bb4 are also arranged side by side along the inner periphery (vertical direction in FIG. 7) of the skin plate 5 (rear body plate 5b). Adjacent seal members 12Bb1, 12Bb2, 12Bb3, and 12Bb4 are also arranged along the inner periphery of the skin plate 5 such that portions of both sides of each seal member in the width direction (circumferential direction of the skin plate 5) overlap with each other.

[0097] The width W1 of the fixing portions of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, and 12Bb4 (the dimension in the circumferential direction of the skin plate 5) is, for example, about 100 mm, and the width W2 of the protruding portions of the sealing members 12Ba1, 12Bb1, 12Ba2, 12Bb2, 12Ba3, 12Bb3, 12Ba4, and 12Bb4 is, for example, about 150 mm. Note that these dimensions are not limited to those described above and can be changed in various ways.

[0098] (Second embodiment)

[0099] 9 is a rear view of a shield machine according to another embodiment of the present invention, as seen from the rear. For ease of explanation, the reference numerals of the front sealing members 12Ba (12Ba1, 12Ba2, 12Ba3, 12Ba4) are also shown in FIG.

[0100] As shown in Fig. 9, in this embodiment, the range of the side region Sd is wider than in the first embodiment. While not particularly limited, the left-right angle Rx3 is, for example, 120°, and the side region Sd is set to, for example, one-third of the entire perimeter of the skin plate 5. Specifically, when the skin plate 5 is viewed from the rear, the side region Sd is in the ranges of 1 o'clock to 5 o'clock and 7 o'clock to 11 o'clock. The seal members 12Ba1, 12Bb1, 12Ba2, and 12Bb2 of the upper region Up and the lower region Un are each, for example, composed of a single seal member 12Ba or 12Bb.

[0101] The invention made by the inventor has been specifically described above based on the embodiments, but the embodiments disclosed in this specification are illustrative in all respects and are 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 of the above embodiments, but should be interpreted solely in accordance with the claims, and includes technologies equivalent to the technologies described in the claims and all modifications that do not deviate from the gist of the claims.

[0102] In the above embodiment, a case where a ribbon screw type screw conveyor is used has been described, but the present invention is not limited to this and various modifications are possible. For example, a screw conveyor that combines a ribbon type and a shaft type may be used. [Industrial Applicability]

[0103] The above explanation has been given of the present invention as applied to a mud pressure shield machine, but it is not limited to this and can also be applied to other shield machines, such as a mud pressure shield machine that has a mechanism for stabilizing the face by applying a predetermined pressure to the mud in a chamber and transporting excavated soil by circulating the mud, or a tunnel boring machine that has the function of moving the body forward using a front gripper, a main gripper, and a thrust jack between them. [Explanation of symbols]

[0104] 1. Shield tunneling machine 2 cutter heads 3. Device body 4 chambers 5 Skin Plate 5a Front fuselage plate 5b Rear fuselage plate 7 Bulkhead 8 Cutter driver 9a Folding jack 9b Shield Jack 10 Screw conveyor 11 Erector 12 Tail seal part 12Ba, 12Bb sealing material 12Ba1, 12Bb1, 12Ba2, 12Bb2 sealing material 12Ba3, 12Bb3 sealing material 12Ba4, 12Bb4 sealing material 12R seal chamber 14 Sealant supply pipe 14h communication hole CB Center Bit B bit CC copy cutter SB Stirring Bar SG Segment Up Upper area Un lower area Md middle area Sd lateral region P1,P2,P3,P4 Steel plate part M Wire mesh section Br Brush part

Claims

1. a cutter head for excavating the ground; a device body that rotatably supports the cutter head; a skin plate that forms an outer shell of the device body; a tail seal portion provided between an inner periphery of the skin plate and an outer periphery of a segment provided on the rear end side of the device main body; Equipped with The tail seal portion has a plurality of plate-shaped seal members provided along an inner periphery of the skin plate, the sealing member has spring properties, and one end of the sealing member in the front-rear direction of the device body is fixed to the skin plate, and the other end of the sealing member in the front-rear direction is in contact with the outer periphery of the segment, the plurality of seal members provided along the inner periphery of the skin plate comprise seal members in left and right side regions, a seal member in an upper region above the side regions, a seal member in a lower region below the side regions, and a seal member in an intermediate region between the upper region, the lower region, and the side regions; A shield tunneling machine characterized in that the length of the protruding portion protruding from the fixing portion of the sealing member in at least one of the left and right side regions toward the segment is longer than the length of the protruding portion protruding from the fixing portion of the sealing member in the upper region and the lower region toward the segment.

2. A shield tunneling machine as described in claim 1, characterized in that the length of the protruding portion protruding from the fixing portion of the sealing member in the middle region toward the segment is gradually increased from the protruding length in the lower region and the upper region toward the protruding length in the side region.

3. A shield tunneling machine as described in claim 1, characterized in that the length of the protruding portion protruding from the fixed portion of the seal member in the intermediate region toward the segment is increased for each block of the seal member in the intermediate region from the protruding length in the lower region and the upper region toward the protruding length in the side region.

4. 3. A shield machine according to claim 2, wherein the spring force of the seal members in the side regions is stronger than the spring force of the seal members in the upper and lower regions.

5. A shield tunneling machine as described in claim 4, characterized in that the sealing member has a springy steel plate portion fixed in a cantilevered manner to the skin plate, and the number of steel plates in the steel plate portion of the sealing member in the side region is greater than the number of steel plates in the steel plate portion of the sealing member in each of the upper region and the lower region.

6. A shield tunneling machine as described in claim 4, characterized in that the sealing member has a springy steel plate portion fixed in a cantilevered manner to the skin plate, and the thickness of the steel plate of the steel plate portion of the sealing member in the side region is thicker than the steel plate of the steel plate portion of each of the sealing members in the upper region and the lower region.

7. A shield machine according to any one of claims 1 to 6, characterized in that the side region is set to one-sixth to one-third of the total perimeter of the skin plate.

8. A shield tunneling machine as described in any one of claims 1 to 6, characterized in that the upper region is set to the upper sixth of the total circumference of the skin plate, the lower region is set to the lower sixth of the total circumference of the skin plate, and the side region is set to the side sixth of the total circumference of the skin plate.

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