TW201504513A - Cutter board of shield tunneling machine and shield tunneling machine including the same - Google Patents

Abstract

Object of this invention is to prolong the replacement period of drilling bit of the cutter board of a shield tunneling machine. This invention provides a mud pressure shield tunneling machine 1, in both outer edge portions in the width direction of each of spoke parts 2b of a cutter head 2 constituting the mud pressure shield tunneling machine 1, a scraper tooth 4s is only provided in the outermost periphery portion in the extending direction of the spoke part 2b without being provided in other areas where, instead, is provided with a protective plate PA, and the number of the scraper tooth 4s, of which the durability is significantly lower than that of other drilling bits such as a drilling bit 4b, is substantially reduced, it is possible to prolong the replacement period of the drilling bit of the cutter head 2. Therefore, since the cumbersome drilling bit replacement operations which takes time and effort are reduced, it is possible to promote the long-distance construction of the mud pressure shield tunneling machine 1.

Description

Tool disk for the shield shield excavator, and the shield shield excavator with the cutter plate

The invention relates to a cutter disk of a shield shield excavator and has The shield shovel of the cutter disc, such as the technique of the configuration of the drill bit for the cutter disc.

The submerged shield excavator is set on the machine body by one side The front cutter disk presses the excavation face of the foundation and rotates it to advance the pit to form a machine on the foundation.

The sand excavated by the cutter disc is placed on the cutter disc After being mixed with the additive material in the mud tank between the partition of the machine body, it is discharged from the rear of the machine body.

The cutter plate has: a central hub portion; a plurality of wheels The spoke portion extends radially from the hub portion, and the outer peripheral ring portion connects the outer peripheral portions of the plurality of spoke portions in the extending direction.

Roller cutters and leading drill bits are arranged in each spoke portion Various drill bits such as (pilot bit) and scraper teeth. The roller type cutter is disposed in front of each spoke portion, and mainly crushes large pebbles and the like. Lead drill A plurality of fronts are arranged in front of each spoke portion for conducting the leading excavation and protecting the scraper teeth. Further, the blade teeth are arranged at a plurality of outer edge portions in the width direction of each of the spoke portions, that is, at an outer peripheral corner portion of the inlet of the excavated sand, along the extending direction of each of the spoke portions, and the foundation is excavated And the excavated sand is introduced into the mud tank (for example, refer to Patent Documents 1 to 5).

(previous technical literature) (Patent Literature)

Patent Document 1: Japanese Laid-Open Patent Publication No. 2012-12257

Patent Document 2: Japanese Laid-Open Patent Publication No. 2012-12258

Patent Document 3: Japanese Laid-Open Patent Publication No. 2012-12259

Patent Document 4: Japanese Laid-Open Patent Publication No. 2012-12260

Patent Document 5: Japanese Patent Laid-Open No. Hei 10-140984

However, each of the above-described various drills disposed in the cutter disk has different durability (life), and the drill with the lowest durability is used to determine the exchange period of the drill. In particular, when the cobble layer or the like is excavated, the scraper teeth disposed at the outer peripheral corner portion of the excavation of the sand are likely to be worn by the cobbles or the like, so that the durability is significantly lower than that of the other drills. The drill bit must be exchanged after being worn, and the exchange operation is a troublesome operation requiring a lot of time and labor, and becomes a factor that hinders the long-distance construction of the shield shovel. Therefore, how to extend the shield excavator The exchange period of the drill bits of the tool disk has become an important issue.

The present invention has been developed in view of the above technical background, The aim is to provide a technique that is used in a shieldless excavator to extend the exchange period of the drill bit of the tool disk.

In order to solve the above problems, the first item of the patent application scope is The tool disk of the shield excavator according to the present invention includes: a hub portion; a plurality of spoke portions extending radially from the hub portion; and an outer peripheral ring portion extending the outer circumference of the plurality of spoke portions a plurality of leading drills disposed in front of each of the plurality of spoke portions; and a protective member disposed in the outer spokes of the outer edges of each of the plurality of spoke portions At least a portion of the extending direction of the portion protects both outer edge portions of the spoke portion in the width direction.

The invention of claim 2, wherein in the invention according to the first aspect of the invention, in the outer peripheral portion of the width direction of each of the plurality of spoke portions, only the spoke portion The outer peripheral portion in the extending direction is provided with scraping teeth.

The invention of claim 3, wherein the plurality of spoke portions each have a dimension in the width direction from the foregoing The hub portion is formed to be widened and widened, and in each of the plurality of spoke portions, the number of rows of the preceding drill bits disposed on the outer peripheral side in the extending direction of the spoke portion is arranged on the center side of the spoke portion The number of rows of the aforementioned leading drill bits is more.

Furthermore, the invention of claim 4 is the invention of claim 1, wherein the plurality of leading drill bits are guided by the drill bit adjacent to the direction of rotation. The position is arranged in a state in which the extending direction of the spoke portion is deviated.

Further, the tool disk of the shieldless excavator of the invention of claim 5 is characterized in that: a hub portion; a plurality of spoke portions extending radially from the hub portion; and a peripheral ring portion for the plurality of spokes The outer peripheral portion of the extending direction of the portion is coupled; the plurality of leading drills are disposed in front of each of the plurality of spoke portions; and the scraping teeth are disposed in the width direction of each of the plurality of spoke portions In the edge portion, only the outer peripheral portion in the extending direction of the spoke portion is provided.

Furthermore, the shield shovel according to the invention of claim 6 is provided with the tool according to any one of the above claims 1 to 5 in a state in which the front side of the machine body is rotatable. plate.

According to the invention of claim 1, the protective member is provided on both outer edge portions in the width direction of the spoke portion constituting the cutter disk, and since the blade teeth having low durability can be reduced or removed, the composition can be configured. The exchange period of the drill bit of the cutter disk of the submersible excavator is extended.

According to the invention of claim 2, since the blade teeth having low durability can be reduced, the exchange period of the drills constituting the cutter disk of the shield excavator can be extended.

According to the invention of claim 3, since the number of drill bits before the cutter disc is increased, it can be dispersedly applied to the front drill. The load of the head. Therefore, the durability of the leading drill bit can be improved, so that the exchange period of the leading drill bit of the cutter disk can be extended.

According to the invention of claim 4, since the number of operations of the drill bit before the cutter disc is increased, the depth of the slit of each of the leading drills can be reduced. Therefore, the wear and the loss of the leading drill bit can be suppressed or prevented, so that the exchange period of the leading drill bit of the cutter disk can be extended.

According to the invention of claim 5, since the blade teeth having low durability can be reduced, the exchange period of the drill bits constituting the cutter disk of the shield excavator can be extended.

According to the invention described in claim 6 of the patent application, since the exchange period of the drill bit of the cutter disk can be extended, the long-distance construction of the shield excavator can be promoted.

1‧‧‧Soil pressure shield excavator

2‧‧‧Cutting head

2a‧‧·wheel hub

2b‧‧‧ spokes

2c‧‧‧Intermediate ring

2d‧‧‧Outer Rings

2c‧‧‧through holes

2f‧‧‧Restricted protrusion

3‧‧‧ machine body

3a‧‧‧ front panel

3b‧‧‧ rear panel

4, 4s‧‧‧ scraper teeth

4a‧‧‧Center drill bit

4b, 4c‧‧‧ drill bit

4d‧‧‧Copy bit

5a1 to 5a4‧‧‧Material injection department

6‧‧‧ mud tank

9a‧‧‧ articulated jack

9b‧‧‧Shield Jack

10‧‧‧Spiral conveyor

10a‧‧‧Sandwork access to the end

10b‧‧‧Draining end

15a, 15b, 16a, 16b‧‧‧ stirring wings

BM‧‧‧bit base material

BC‧‧‧Superhard drill bit

C‧‧‧Control Department

D‧‧‧Display Department

MA‧‧‧ mounting plate

MB‧‧‧Installation board

PA‧‧‧protection board

PB‧‧‧protection board

SB‧‧‧ follow-up trolley

Fig. 1 is a view showing the internal display of a earth pressure shield shovel according to an embodiment of the present invention in a perspective view from the side.

Fig. 2(a) is a front view of the cutting head of the earth pressure shield shovel of Fig. 1, and Fig. 2(b) is the side of the cutting head of Fig. 2(a) viewed from the direction of the arrow symbol A1. view.

Fig. 3 is a view showing the configuration of the position X of the earth pressure shield shovel of Fig. 1 viewed from the direction indicated by the arrow symbol.

Fig. 4 is an enlarged plan view showing a spoke portion of the cutting head of Fig. 2;

Figure 5 (a) is a cross-sectional view taken along line I-I of Figure 4, and Figure 5 (b) is from The direction of the arrow symbol A2 is a side view of the main portion of the spoke portion of Fig. 5(a).

Fig. 6 is a cross-sectional view showing a portion corresponding to I-I of Fig. 4 in a spoke portion having a doctor blade.

Fig. 7 is a view showing a particle size accumulation curve of the foundation of the excavation object.

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. In the drawings for explaining the embodiments, the same components are denoted by the same reference numerals, and the description thereof will not be repeated.

Fig. 1 is a perspective view showing the internal display of the earth pressure shield shovel according to an embodiment of the present invention in a perspective view from the side, and Fig. 2(a) is a cutting machine of the earth pressure shield shovel of Fig. 1; Front view of the head, Fig. 2(b) is a side view of the cutting head of Fig. 2(a) viewed from the direction of arrow symbol A1, and Fig. 3 is a view of the soil of Fig. 1 from the direction indicated by the arrow symbol The composition of the position X of the submersible shield excavator.

The earth pressure shield shovel 1 of the present embodiment is formed by injecting and mixing the added material into the sand excavated by the cutting head (tool disc) 2 to have water impermeability and plastic fluidity (freely deformable and The soil of the nature of the movement is excavated in a state where the soil is filled in the chamber between the cutting head 2 and the machine body 3 to generate a soil pressure, and the earth pressure is pressed against the earth pressure of the excavation surface. The machine for constructing the excavation pit is constructed.

This clay pressure shield shovel 1 is especially suitable for mining bags. The case where the gravel is mixed with the gravel layer of the cobble and the foundation of the cobble layer. Of course, it can also be applied to gravel layers and cobble layers or ordinary gravel layers mixed with large gravel and mixed with large gravel.

Further, the excavation outer diameter of the earth pressure shield shovel 1 is, for example, about 5900 mm. Further, the mechanical length of the earth pressure shield shovel 1 is, for example, about 7140 mm. Further, the operation of the earth pressure shield shovel 1 is controlled by an operator in an operation room in the subsequent carriage SB (refer to FIG. 1) disposed behind it. Furthermore, the entire operation of the earth pressure shield shovel 1 is controlled by the control unit C provided in the operation room. The control unit C is electrically connected to the display unit D provided in the operation room. In the display unit D, various kinds of information transmitted from the control unit C are displayed.

The cutting head 2 is a member for excavating the excavation surface of the foundation, and is provided on the front side of the machine body 3 in a rotatable state along the circumferential direction of the cutting head 2. In the cutting head 2, for example, a disc-shaped spoke type is employed. That is, as shown in Fig. 2(a), the cutting head 2 includes a central hub portion 2a, six spoke portions 2b extending radially from the hub portion 2a, and an intermediate ring portion 2c. The intermediate portion of each of the spoke portions 2b is connected to each other; the outer peripheral ring portion 2d connects the tip end portions of the spoke portions 2b to each other; and the through hole 2e is formed between the members.

A center bit 4a is attached to the hub portion 2a at the center of the cutting head 2. Further, other excavating members such as a conical head type roller type drill may be attached to the hub portion 2a.

Each spoke portion 2b is in the width direction thereof (cutting head 2 The size of the rotation direction is formed to be widened as being separated from the hub portion 2a. A drill (lead drill) 4b and a scraper tooth 4s are attached to each of the spoke portions 2b. Further, in addition to the drill 4b, other excavating members such as a roller type drill may be attached to the front surface of the spoke portion 2b.

The drill bit 4b has a function of protecting the blade teeth 4s in addition to the crushing of the cobbles or the like and the excavation of the foundation, and as shown in Fig. 2(a), in front of the respective spoke portions 2b (with the excavation face) A plurality of faces are arranged in a regular manner. Each of the drills 4b has a planar shape formed, for example, in a nearly rectangular shape, and is disposed such that its long side is along the width direction of the spoke portion 2b.

Further, the number of rows of the drills 4b on the outer peripheral side of each of the spoke portions 2b is larger than the number of rows of the drills 4b on the center side (the hub portion 2a side) (the radial direction is a row, and the circumferential direction is a row). For example, the drill 4b on the center side of the spoke portion 2b is arranged in one row in the width direction of the spoke portion 2b, and three rows are arranged along the extending direction of the spoke portion 2b. On the other hand, the drill 4b on the outer peripheral side of the spoke portion 2b is Two rows are arranged in the width direction of the spoke portion 2b, and six rows are arranged along the extending direction of the spoke portion 2b. In this way, since the number of the drills 4b is increased, the punching and the load applied to the drill 4b can be dispersed. Therefore, the durability of the drill 4b can be improved. Therefore, the exchange period of the drill bit 4b of the cutting head 2 can be extended.

Here, although the position of the drill 4b adjacent to the rotational direction of the cutting head 2 is disposed on the same rotational locus, the present invention is not limited thereto, and the drill 4b adjacent to the rotational direction of the cutting head 2 may be used. The position is shifted in the extending direction of the spoke portion 2b. In this way, the cutting head can be increased The number of digging operations in the front of 2. In particular, since the drill 4b of two rows is disposed on the outer peripheral portion of the spoke portion 2b, the number of excavation operations can be increased more than the center side. As described above, by increasing the number of excavation operations, the depth of the slit of each of the drills 4b can be reduced, so that the wear and the defect of the drill 4b can be suppressed or prevented. Therefore, the exchange period of the drill bit 4b of the cutting head 2 can be extended.

Further, the drill bit 4b adjacent to the same rotational locus in the cutting head 2 differs in such a manner that its height is repeated in the rotation direction of the cutting head 2. The height of the drill bit 4b on the same rotational locus of the adjacent spoke portion 2b on the center side of the cutting head 2 is different. Further, as shown in FIG. 2(b) on the outer peripheral side of the cutting head 2, the height of the drill 4b adjacent to the same rotational locus is also different in one spoke portion 2b. As described above, by changing the height of the drill 4b on the same rotational locus alternately in the rotational direction, the punch and the load applied to the drill 4b can be dispersed, so that the durability of the drill 4b can be improved. Therefore, the exchange period of the drill bit 4b of the cutting head 2 can be extended. Further, by changing the height of the drill 4b on the same rotation locus, it is possible to appropriately crush the cobbles or the like on the excavation face side.

On the other hand, the scraper teeth 4s have a function of excavating the foundation and introducing the excavated sand into the mud tank 6, and are provided only in the extending direction of the spoke portion 2b on both outer edge portions in the width direction of each spoke portion 2b. The outermost week. In other words, in the regions other than the outermost circumference in the extending direction of the spoke portion 2b of the outer edge portions of the respective spoke portions 2b, the blade teeth 4s are not provided, and the protective plate is attached through the mounting plate MA. (Protection member) PA. In this way, the durability can be greatly reduced in the cutting head 2 The scraper teeth are 4 s, so that the exchange period of the drill bit of the cutting head 2 can be extended. Further, by providing the protective plate PA, both outer edge portions in the width direction of each of the spoke portions 2b can be protected. The drill 4b, the scraper teeth 4s, the protective plate PA, and the like of the spoke portion 2b will be described in detail later.

Further, additive material injection portions 5a1, 5a2, 5a3, and 5a4 are provided in the hub portion 2a and the spoke portion 2b. The additive material injection portions 5a1 to 5a4 are, for example, a component in which a clay material such as a bentonite-based additive material is injected into an excavation surface of the front surface of the cutting head 2. Further, the additive material injected from each of the additive material injection portions 5a1 to 5a4 may be used in place of the bentonite-based additive material, or both the bentonite-based additive material and the bubble material may be used.

A restricting projection 2f is provided at the center between the adjacent spoke portions 2b, 2b in the intermediate ring portion 2c. The sand excavated by the cutting head 2 is introduced into the mud tank 6 (see FIG. 1) to be described later through the through hole 2e, and the restriction protrusion 2f restricts the soil by restricting the opening area of the through hole 2e. The boulders and cobbles in the middle enter the portion of the mud tank 6 through the through hole 2e. The surface of the restricting projection 2f is also provided with a drill 4b.

A plurality of drills 4c are mounted in an array on the front side of the excavation face side of the outer peripheral ring portion 2d. The height of the drill 4c adjacent to the direction of rotation of the cutting head 2 in the drill 4c differs in such a manner that the rotation direction of the cutting head 2 is reversed. In this way, the punch and load applied to the drill 4c can be dispersed, and the durability of the drill 4c can be improved. Therefore, the exchange period of the drill bit 4c of the cutting head 2 can be extended. again By changing the height of the drill 4c on the same rotational locus, the cobbles of the excavation surface and the like can be appropriately broken.

Further, on the outer peripheral surface of the outer peripheral ring portion 2d, for example, two copy drills 4d are placed at the opposite pole positions. The copy drill 4d has a function of super-excavation during the construction of the acute curve and posture control of the earth pressure shield shovel 1.

On the other hand, as shown in Fig. 1, the main body 3 includes a front sill 3a of the cutting portion and a rear sill 3b at the rear. The front sill 3a and the sill 3b are formed, for example, of a cylindrical steel plate to form an outer shape of the machine body 3, and a hollow space member is formed inside the machine body 3. The front jaw 3a and the rear jaw 3b are in the rear end side of the front jaw 3a, and the spherical bearing portion of the front end of the rear jaw 3b comes into contact with the inner peripheral surface of the front jaw 3a to be fitted to each other.

On the front side of the front sill 3a, a partition 7 that partitions the hollow space in the machine body 3 into the excavation face side and the machine inner side is provided at a position receding from the front side thereof to the inner side of the machine body 3. The muddy water tank 6 is provided on the excavation surface side of the partition plate 7, that is, between the cutting head 2 and the partition plate 7, and the additive material injection portion 5b is provided inside the partition plate 7 a cutting drive body 8b; an articulated jack 9a; a shield jack 9b; a screw conveyor 10; and a soil pressure detecting portion 11.

The additive material injection portion 5b is a device that injects the additive material into the mud chamber 6 outside the machine body 3, and is disposed in the partition plate 7 in a state where the injection port of the additive material injection portion 5b is exposed to the outside of the machine body 3. Near the periphery. Additive material injected from the additive material injection portion 5b For example, a bentonite-based additive material or the like is used as the clay material. Further, the additive material injected from the additive material injection portion 5b may be used in place of the bentonite-based additive material, or both the bentonite-based additive material and the bubble material may be used.

The mud tank 6 is used to introduce the space introduced by the sand excavated by the cutting head 2. In the mud tank 6, a stirring blade 15a, 15b protruding in a cylindrical shape or the like in the mud tank 6 is provided in front of the partition 7, and on the other hand, a muddy tank 6 is provided on the back surface of the cutting head 2. Stirring wings 16a, 16b of a cylindrical shape or the like inside. The agitating blades 15a, 15b, 16a, and 16b are provided with a function of agitation and mixing. The agitating and mixing function is such that the agitating blades are displaced from each other in the radial direction of the cutting head 2, and enters when the cutting head 2 rotates. The sand in the mud tank 6 is stirred and mixed with the added material injected into the mud tank 6.

Further, the agitation blade 15b provided on the center side of the surface of the partition plate 7 has an additive material injection portion that injects the additive material into the mud tank 6 from the front end side thereof. By adding the additive material from the front end portion of the stirring blade 15b separated from the front surface of the partition plate 7, the additive material can be more appropriately injected into the mud water tank 6, and the plastic fluidity of the excavated sand can be improved. As the additive material injected from the stirring blade 15b, for example, a bubble material is used. Further, as the additive material injected from the stirring blade 15b, a bentonite-based additive material may be used instead of the bubble material, or both the bentonite-based additive material and the bubble material may be used.

The cutting drive body 8 is a drive source for rotating the cutting head 2. Here, in terms of the cutting drive method, an intermediate support drive is exemplified. As shown in Fig. 1, the cutting driver 8 is disposed at a position substantially at the center of the center and the outer periphery of the front surface of the cutting head 2, and is arranged in a plurality of rows along the circumference of the cutting head 2. .

The hinged jack 9a is a machine that connects the front sill 3a and the sill 3b, and corrects the driving direction of the earth pressure shield shovel 1, as shown in Fig. 1, in the machine body 3 The position of the boundary between the plate 3a and the rear sill 3b is arranged in a plurality of positions along the circumferential direction of the earth pressure shield shovel 1. The earth pressure pressing shield excavator 1 is pushed by the pressure oil to the hinge jack 9a and the front jaw 3a and the rear jaw 3b are bent in a predetermined direction and angle, and the soil pressure can be controlled. The driving direction of the shield shovel 1.

The shield jack 9b is a machine that generates a reaction force in a section SG disposed at the rear of the machine body 3 to generate a driving force for advancing the earth pressure shield excavator 1. As shown in Fig. 1, it is attached to the machine. In the main body 3, at a position crossing the boundary between the front sill 3a and the rear sill 3b, as shown in Fig. 3, a plurality of them are arranged in the circumferential direction of the earth pressure shield shovel 1.

The screw conveyor 10 is a machine that discharges the sand introduced into the mud tank 6 to the machine outside the machine, and is arranged as shown in Fig. 1 to be disposed in the mud tank 6 from the bottom of the machine body 3 through the partition plate 7. The discharge end portion 10a of the sand take-in end portion 10a is disposed in a state in which the discharge end portion 10b at a position slightly higher than the center in the height direction of the machine body 3 is continuously extended obliquely upward.

In the case of the screw conveyor 10, for example, a belt screw is used. A rotary conveyor which mounts a spiral blade 10c having no rotating shaft in a pipe. When the screw conveyor having the rotating shaft is easily clogging due to gravel or the like, the belt screw conveyor 10 can set the maximum diameter of the transportable gravel or the like to be equal to or larger than the radius of the conveying path, and can also be utilized. The gravel of the rotating shaft cannot be transported by gravel or the like that cannot be transported. In this way, the earth pressure shield shovel 1 of the present embodiment is configured to be introduced into the mud tank 6 without crushing large pebbles or the like which can be discharged by the screw conveyor 10.

Further, a drain pipe (not shown) is connected to the discharge end portion 10b of the screw conveyor 10, and the sand conveyed to the discharge end portion 10b of the screw conveyor 10 is conveyed to the trolley or the like through the drain pipe.

The earth pressure detecting unit 11 converts the pressure generated by the soil in the mud tank 6 into a sensor portion of the electric signal through a strain gauge, and is disposed in a state where the earth pressure detecting surface faces the mud tank 6. The earth pressure shield shovel 1 is managed so that the earth pressure in the mud tank 6 detected by the earth pressure detecting unit 11 is within a predetermined range, thereby excavating while maintaining the stability of the excavation surface. Process the job.

Next, Fig. 4 is an enlarged plan view showing the spoke portion of the cutting head of Fig. 2, Fig. 5(a) is a sectional view taken along line II of Fig. 4, and Fig. 5(b) is taken from arrow symbol A2. The direction is a side view of the main portion of the spoke portion of Fig. 5(a). In addition, Fig. 5(b) is a side view, and a part is marked with a hatching in order to make the drawing clear and easy to see.

As shown in Fig. 4, the drill 4b is arranged in one row on the center side of the spoke portion 2b and two rows on the outer peripheral side, as described above. Take this side In addition to the above effects, the number of the drills 4b in the in-plane of the cutting head 2 is increased, and the portion of the scraper teeth 4s is greatly reduced.

Each of the drills 4b is configured by partially embedding a plurality of super hard drills BC into the drill base material BM as shown in Figs. 4 and 5 . The super hard drill BC is formed, for example, of a metal carbide such as tungsten carbide or the like and an alloy of an iron-based metal such as nickel and cobalt, and is disposed in plural along the long sides of the drill 4b.

Further, a plurality of protective plates PB are provided in the vicinity of the outer edge portions in the width direction of the spoke portion 2b so as to surround the end portion of the drill 4b. The protective plate PB has a function of protecting the front surface of the spoke portion 2b instead of the blade teeth 4s, and is joined to the front surface of the spoke portion 2b through the mounting plate MB. In this way, the wear of the front face of the spoke portion 2b can be suppressed or prevented.

Further, as shown in FIGS. 4 and 5, in the outer edge of the outermost circumference in the extending direction of the spoke portion 2b in the outer edge portions of the respective spoke portions 2b in the width direction, the mounting plate MA is provided with plural numbers. Block protection board PA. According to this configuration, the outer edge portions of the respective spoke portions 2b in the width direction can be protected, so that the abrasion of the outer edge portions of the respective spoke portions 2b in the width direction can be suppressed or prevented. Further, each of the protective plates PA is attached and detached by the bolts BT so as to be exchangeable in accordance with each block.

However, in general, the doctor blade system is set to have the function of introducing excavated sand. Therefore, generally, in the earth pressure shield shovel, a plurality of scraping teeth are disposed at predetermined intervals in the outer peripheral portions of the spoke portion in the width direction along the extending direction of the spoke portion.

However, although it does not have scraping teeth, it does not necessarily cause It is impossible to introduce the excavated sand into the mud tank 6 and it is impossible to excavate. Here, Fig. 6 is a cross-sectional view of a portion corresponding to I-I of Fig. 4 in a spoke portion having a doctor blade.

When excavating a cobble layer or the like, most of the sand is a large pebble ST, but in the case of the cobble ST, as indicated by an arrow symbol A3, most of the force may be pressed toward the side of the foundation, and It cannot be said that the scraper tooth 4s has the function of introducing the large pebble ST.

Further, as long as the sand is fine particles, sand may generally flow as indicated by an arrow symbol A4 (dashed line), but actually the sand is retained around the periphery of the drill 4b as indicated by an arrow symbol A5 (solid line). Moreover, the flow of all the sand in the mud tank 6 is reasonably formed by the pressure gradient of the soil generated by the dumping of the screw conveyor 10, and the excavated sand is re-introduced to the extent of the soil discharged. Mud tank 6 inside.

Furthermore, in the excavation of the cobble layer, the foundation of the cobble layer is not a continuum, and when the cobble is excavated, the influence reaches a certain range, and the foundation surrounding the excavation site is loose, and the like, even It is also possible to use the drill 4b without the scraper teeth.

On the other hand, in various drills arranged in the cutting head, the durability (life) is different, and the exchange period of the drill is determined according to the drill having the lowest durability. In particular, when excavating a cobble layer or the like, the scraper teeth disposed at the outer peripheral corners of the excavation of the sand are likely to be worn due to collision of the cobbles, and the wear is significantly lower than that of the other drills. . When the drill bit is worn, it must be exchanged, and the exchange work is an obstacle to the work that requires a lot of time and labor trouble. The main reason for the long-distance construction of the shield shield excavator. Therefore, in the shield excavator, how to extend the exchange period of the drill bit of the cutter disc is an important issue.

As described above, in the present embodiment, as shown in FIG. 4, in the outer edge portions of the respective spoke portions 2b in the width direction, the scraping teeth 4s are provided only at the outermost peripheral portion of the extending direction of the spoke portion 2b. Instead of providing the scraping teeth 4s in other areas, the protective plate PA is instead provided.

In this way, the scraping tooth 4s having the lowest durability can be greatly reduced in the drill of the cutting head 2, and the drill bit arrangement of the cutting head 2 can be formed by the drills 4a, 4b, 4c having excellent durability, so that the cutting can be performed. The exchange period of the drill bit of the handpiece 2 is extended. Therefore, the long distance construction of the earth pressure shield shovel 1 can be promoted.

Further, since the number of exchanges of the drill bit of the cutting head 2 can be reduced, the construction period of the excavation work can be shortened. Further, the cost-effective scraper teeth can be reduced, and since the number of exchanges of the drill bits of the cutting head 2 can be reduced, the cost required for the excavation work can be reduced.

Further, since the scraping teeth 4s can be reduced in accordance with the reduction of the blade teeth 4s, the cost required for the exchange of the components can be reduced, and the management of the replacement drill can be easily performed.

Next, the mud pressure shield method of the earth pressure shield shield excavator 1 of Fig. 1 will be described.

Fig. 7 is a graph showing the particle size accumulation curve of the foundation of the excavation object. Here, for example, a fine particle (sand portion) having a particle diameter of less than 2 mm is not more than 20%, and a gravel (gravel portion) having a particle diameter of 2 mm or more is more than 80%. To mine objects.

In the earth excavation excavator 1 of the present embodiment, the earth body is driven in the soil by pressing the cutting head 2 against the excavation surface and rotating the machine body 3 while rotating it. Construction of excavation pits.

In the excavation work, the additive material is added to the sand excavated by the cutting head 2, and the sand and the additive material are added by the rotation of the cutting head 2 and the stirring wings 16a, 16b and the like accompanying the rotation. The mixture is stirred and mixed to convert the excavated sand into a soil having plastic fluidity and impermeability. Then, the soil is filled in the mud tank 6 and the screw conveyor 10, and the soil full of the soil is pressurized by the driving force of the shield jack 9b, and the soil pressure is generated, and the soil is pressed and opened. The ground pressure of the face is pressed to maintain the stability of the excavation face. Further, for example, by maintaining the rotational speed of the cutting head 2 constant, and adjusting the stretching speed of the shield jack 9b and the rotational speed of the screw conveyor 10, the earth pressure detecting portion 11 is used to measure the inside of the mud tank 6. The soil is pressed and made constant to maintain the stability of the excavation face.

The bentonite-based additive (for clay) added as an additive material has an effect of improving the plastic fluidity and water impermeability of the sand, and the action is to be broken by the massive gravel. Gravel portions such as gravel and cobbles are encased in the excavated sand and the body portion of the excavated sand and gravel portion is improved in such a manner that the gravel portion is not separated from the excavated sand.

On the other hand, the bubble material added as an additive material In addition to the separation effect of the above-mentioned gravel portion adhering to the cutting head 2 and the partition 7, the material system also has an effect of improving the excavation sand by the buffering action which cannot be obtained by using the bentonite-based additive material. The compressibility of the soil and the mud material is such that the gravel portion is prevented from rolling in the mud tank 6 and the screw conveyor 10. Further, even if a rolling motion is generated, the abrupt change in the mud pressure can be suppressed by the buffering action.

Therefore, it is also possible to stabilize the soil pressure when the gravel mixed with the large gravel mixed with the gravel in the mud tank 6 and the foundation with the cobble layer are excavated, and the soil pressure can be stabilized and maintained. In addition to the stability of the surface to be dug, the soil discharged by the gravel portion by the screw conveyor 10 is smoothly moved to prevent the occurrence of clogging, and the occurrence of clogging can be prevented.

The inventions set forth by the inventors of the present invention have been specifically described above, but the embodiments disclosed in the present specification are exemplified in all respects and may not be construed as being limited by the disclosed technology. In other words, the technical scope of the present invention is not limited by the description of the foregoing embodiments, and should be construed only in accordance with the description of the claims, without departing from the technology described in the claims. All changes are included in the spirit and scope of the patent application.

For example, in the above-described embodiment, the case where the belt type spiral type screw conveyor is used has been described. However, the present invention is not limited thereto, and various modifications may be made. For example, a belt type and a shaft type may be used. Screw conveyor.

(industrial availability)

In the above description, although the present invention is applied The case of the earth pressure shield shield excavator of the intermediate support drive method will be described, but it is not limited thereto, and can be applied to other shield shield excavators such as a central axis drive method and a peripheral support drive type earth pressure shield shield excavator. .

Reason: The entire schema [Fig. 2 (a) and (b)] must be used to show the complete technical features.

2‧‧‧Cutting head

2a‧‧·wheel hub

2b‧‧‧ spokes

2c‧‧‧Intermediate ring

2d‧‧‧Outer Rings

2e‧‧‧through holes

2f‧‧‧Restricted protrusion

4a‧‧‧Center drill bit

4b, 4c‧‧‧ drill bit

4d‧‧‧Copy bit

4s‧‧‧ scraper teeth

5a1 to 5a4‧‧‧Material injection department

MA‧‧‧ mounting plate

PA‧‧‧protection board

Claims (6)

A cutter disk of a shield shield excavator, comprising: a hub portion; a plurality of spoke portions extending radially from the hub portion; and an outer peripheral ring portion connecting the outer peripheral portions of the plurality of spoke portions in an extending direction; a plurality of leading drill bits disposed in front of each of the plurality of spoke portions; and a protective member disposed in the outer peripheral portions of the width direction of each of the plurality of spoke portions, the extension of the spoke portion At least a portion of the direction protects both outer edge portions of the spoke portion in the width direction. The tool disk of the shield excavator according to the first aspect of the invention, wherein, in the outer peripheral portions of the width direction of each of the plurality of spoke portions, only the outer peripheral portion of the extending direction of the spoke portion Set the scraper teeth. The cutter disk of the shield excavator according to the first or second aspect of the invention, wherein each of the plurality of spoke portions is widened in a width direction thereof as being separated from the hub portion. In each of the plurality of spoke portions, the number of rows of the preceding drill bits disposed on the outer peripheral side in the extending direction of the spoke portion is the number of rows of the preceding drill bits disposed on the center side of the spoke portion More. For example, the potential shield digging as described in item 1, item 2 or item 3 of the patent application scope The cutter disk of the excavator, wherein the plurality of leading drill bits are disposed in a state in which the position of the drill bit is deviated from the extending direction of the spoke portion before being adjacent to the rotation direction. A cutter disk of a shield shield excavator, comprising: a hub portion; a plurality of spoke portions extending radially from the hub portion; and an outer peripheral ring portion connecting the outer peripheral portions of the plurality of spoke portions in an extending direction; a plurality of leading drills disposed in front of each of the plurality of spoke portions; and a scraping tooth disposed in only two of the outer edge portions of the plurality of spoke portions in the width direction of the spoke portion The outer peripheral portion of the extending direction. A scuttle shovel according to any one of the first to fifth aspects of the invention, wherein the tool lap is provided in a state in which the front side of the machine body is rotatable.