TWI826985B - Shield excavator - Google Patents

Abstract

An objective of the present invention is preventing the performance of stirring rod of shield excavator from deteriorating. A mixing rod 15 provided on a partition plate 7 of an equipment main body 3 of a mud pressure shield excavator 1 includes a replacement portion 15a which is provided on a tip end side thereof in a replaceable state, and an existing portion 15b to which the replacement portion 15a is welded. As a result, if the tip of the mixing rod 15 is damaged or worn out during excavation performed by the mud pressure shield excavator 1, the replacement portion 15a can be removed and replaced with a new one. Therefore, the earth and sand and an additive can be satisfactorily stirred and mixed by the mixing rods 15 and 16R, so that the plastic fluidity of excavated earth and sand can be maintained.

Description

Shield excavator

The present invention relates to a submersible shield excavator, and relates to a structure of a stirring bar for stirring and mixing excavated soil, sand, additives, etc. in a chamber of the submersible shield excavator.

A shield excavator is an excavating machine that makes a cutter disk installed in front of the excavator come into contact with the excavation surface of the natural foundation and rotate it while advancing, thereby forming a hole in the natural foundation. In this submersible shield excavator, in order to promote the mixing of excavated soil and sand with additive materials and water, and to prevent the adhesion or accumulation of excavated soil and sand, the back side of the cutter head (cutter head) and the opposite partition wall surface are or set the stirring rod.

For this submersible shield excavator, for example, Patent Document 1 discloses a method in which a stirring rod called a kneading wing is provided on each of the back surface of the cutter head and the partition wall surface of the submersible shield excavator. When the head rotates, the excavated soil, sand and additives entering the chamber of the submersible shield excavator are stirred and mixed by the stirring rod.

(prior technical literature)

(patent document)

Patent Document 1: Japanese Patent Application Publication No. 2015-21340

However, in the submersible shield excavator, the excavation process is basically carried out without replacing the above-mentioned stirring rod during the excavation process from the beginning to the end of the excavation. The only problem is the following: When, for example, the site to be excavated contains When there are large boulders, etc., the stirring rod may be bent or worn due to the collision between the gravel and the stirring rod, resulting in a reduction in the mixing performance of the stirring rod.

The present invention was developed based on the above-mentioned technical background, and its purpose is to prevent the performance of the stirring rod of a submersible shield excavator from decreasing.

In order to solve the above problems, the shield excavator of the present invention according to aspect 1 is provided with: a cutter head supported in front of the machine body in a traveling direction in a state of being rotatable along the circumferential direction of the machine body; The partition wall is disposed opposite to the back surface of the cutter disc and blocks the opening of the machine body; the chamber is disposed between the back surface of the cutter disc and the front surface of the partition wall; and stirring The means is to stir and mix the excavated soil, sand and additive materials that enter the aforementioned chamber; and the aforementioned stirring means is provided with: a first stirring rod, which is arranged in front of the aforementioned partition wall; and a second stirring rod, which is It is arranged on the back side of the aforementioned cutter plate so that it will not collide with the aforementioned first stirring rod when the aforementioned cutting plate rotates; the respective front ends of the aforementioned first stirring rod and the aforementioned second stirring rod are overlapped in side view. The front end side of at least one of the first stirring rod and the second stirring rod is replaceable.

In the shield excavator of the present invention described in aspect 2, in the invention described in aspect 1, only the front end side of the first stirring rod is replaceable, and the first stirring rod has: A replaceable part on the front end side of the first stirring rod that can be replaced; and an existing part other than the replaceable part.

In the shield excavator according to aspect 3 of the present invention, in the invention according to aspect 2, the length of the front replacement portion of the first stirring rod is longer than the front end of the second stirring rod in side view. When the overlapping length of the first stirring rod is longer.

In the shield excavator according to the fourth aspect of the present invention, in the invention according to the second or third aspect, the replacement part and the existing part of the first stirring rod are welded to each other.

In the shield excavator according to the fifth aspect of the present invention, in the invention according to the fourth aspect, the replacement portion and the existing portion of the first stirring rod have the same radial cross-section, and the A groove for welding that is recessed toward the central axis of the first stirring rod is provided at the boundary between the replacement portion and the existing portion in the outer periphery of the first stirring rod.

In the shield excavator of the present invention according to aspect 6, in the invention according to any one of aspects 2 to 5, the replacement part and the existing part of the first stirring rod are opposite to each other. The surface is provided with a concave-convex fitting portion formed by the concave-convex fitting with each other.

In the shield excavator of the present invention according to aspect 7, in the invention according to aspect 6, a convex portion is provided on the facing surface of the replacement portion of the first stirring rod, and on the existing portion The opposing surface is provided with a recessed portion into which the convex portion of the replacement portion is fitted.

In the shield excavator of the present invention according to aspect 8, in the invention according to any one of aspects 2 to 7, a wing portion is provided on the outer periphery of the existing portion of the first stirring rod, and the aforementioned The front end of the wing portion does not overlap with the replacement portion of the first stirring rod when viewed from the side.

According to the present invention, the performance of the stirring rod of the submersible shield excavator can be prevented from being reduced.

1: Soil pressure shield excavator

2: Tool head

2a: Hub part

2b: Spoke part

2c: Middle ring part

2d: Outer peripheral ring part

2e:Through hole

2f: Limit protrusion

3:Machine body

3a: Front trunk plate

3b: Rear carcass plate

4a to 4c: drill bit

4d: Drill bit (over-excavation drill bit)

5a1 to 5a4: Additive material injection part

5b: Additive material injection part

7: Partition wall panel (partition wall part)

8:Tool drive body

8TA: Torque arm

9a: Center folding jack

9b: Shield Jack

10:Screw conveyor

10a: Soil and sand introduction end

10b: Discharge end

10c:wing plate

15:Mixing stick

15a: Replacement Department

15b: Existing Department

16R: mixing stick

16W: Mixing wing

A: Location

C:Control Department

CP: convex part

CR: chamber

D:Display part

DP: concave part

F: Concave-convex fitting part

J:Joint

L1, L2: length

RP, RsP: buried pole

SG: Ring piece

SB: Follow-up trolley

V: ditch

WP: wing

FIG. 1 is a side perspective view of the internal structure of a soil pressure submersible shield excavator according to an embodiment of the present invention.

Figure 2(a) is a front view of the cutter head of the soil pressure shield excavator in Figure 1, and Figure 2(b) is a structural view of position A of the soil pressure shield excavator in Figure 1 viewed from the direction indicated by the arrow.

Figure 3 is a front view of the cutter head of the soil pressure submersible shield excavator of Figure 1.

Figure 4 is an enlarged cross-sectional view of the main part of the front end of the soil pressure submersible shield excavator in Figure 1.

Figure 5 is an enlarged side view of the main part of the kneading rod of the soil pressure shield excavator shown in Figure 4.

Figure 6(a) is a partially cutaway side view of the main part of the kneading rod with a replacement part. Figure 6(b) is a front view of the kneading rod of Figure 6(a). Figure 6(c) is a cut along the central axis. Figure 6(a) is a sectional view of the main part when the kneading rod is cut, and Figure 6(d) is an enlarged sectional view of the part surrounded by the dotted line in Figure 6(c).

Figure 7(a) is a partially cutaway side view of a modified example of the kneading rod having a replacement part, Figure 7(b) is a front view of the kneading rod of Figure 7(a), and Figure 7(c) is an operational view. 7(a) Cross-sectional view of the essential parts of the kneading rod when cut along the central axis.

Figure 8(a) is a partially cutaway side view of another modification of the kneading rod having a replacement part. Figure 8(b) is a front view of the kneading rod of Figure 8(a). Figure 8(c) is a side view along the A cross-sectional view of the main parts of the kneading rod shown in Figure 8(a) when cut along the central axis.

FIG. 9 is an enlarged side view of the main part of another modified example of the kneading rod having a replacement part.

Figure 10(a) is a partially cutaway side view of a modification of the kneading rod having a replacement part, Figure 10(b) is a front view of the kneading rod of Figure 10(a), and Figure 10(c) is a side view along the Key points when cutting the kneading rod shown in Figure 10(a) at the center axis Figure 10(d) is an exploded cross-sectional view of the kneading rod of Figure 10(c).

Figure 11(a) is a partially cutaway main side view of another modified example of the kneading rod with a replacement part. Figure 11(b) is a front view of the kneading rod of Figure 11(a). Figure 11(c) is a side view along the Figure 11(a) is a cross-sectional view of the main part when the kneading rod is cut along the central axis, and Figure 11(d) is an enlarged cross-sectional view of the main part of the part surrounded by the dotted line in Figure 11(c).

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings. In addition, in the drawings for explaining the embodiments, the same components are marked with the same symbols in principle, and repeated descriptions thereof are omitted.

FIG. 1 is a perspective view of the internal structure of the soil pressure shield excavator according to this embodiment from the side. Figure 2(a) is a front view of the cutter head of the soil pressure shield excavator in Figure 1, and Figure 2(b) is a structural view of position A of the soil pressure shield excavator in Figure 1 viewed from the direction indicated by the arrow.

The soil pressure submersible shield excavator 1 of this embodiment is an excavation machine that fills the cavity CR between the cutter head 2 and the machine body 3 with soil and sand dug by the cutter head (cutter disc) 2 By injecting additives into it and kneading it, the soil and sand become soil with high plastic fluidity (the property of being able to deform and move freely) and water-stopping properties, and at the same time, the soil pressure is used to secure the excavation surface. Stability, one side constructs and digs the pit.

Although not particularly limited, the outer digging diameter of the soil pressure submersible shield excavator 1 is, for example, about 5900 mm, and the machine length is, for example, about 7140 mm. Moreover, the operation of the soil pressure shield excavator 1 is controlled by an operator in an operation room in the follow-up truck SB behind the operator. In addition, the overall operation of the soil pressure submersible shield excavator 1 is controlled by the control unit C installed in the operation room. control. The control unit C is electrically connected to the display unit D installed in the operation room, and the display unit D displays various information sent from the control unit C.

The cutter head 2 is a member that digs the excavation surface of the natural foundation, and is disposed in front of the machine body 3 in a state of being able to rotate freely along the circumferential direction of the machine body 3 . The cutter head 2 adopts, for example, a disk-shaped spoke type. That is, as shown in FIG. 2(a) , the cutter head 2 is provided with: a central hub portion 2a; six spoke portions 2b extending radially from the hub portion 2a toward the outer periphery; and extensions connecting the spoke portions 2b. The intermediate ring portion 2c between the midway portions in the direction; the outer peripheral ring portion 2d connecting the front end portions of the spoke portions 2b; and the through hole 2e formed between these members. In this way, in this embodiment, by adopting a spoke type with a large opening ratio as an example of the cutter head 2, gravel can be introduced into the chamber between the cutter head 2 and the machine body 3 without breaking it as much as possible. .

A plurality of cutter bits (hereinafter referred to as drill bits) 4a to 4d are provided on the cutting surface of the cutter head 2 . A drill bit 4a called a center bit is provided in the hub portion 2a in the center of the cutter head 2. Furthermore, a plurality of drill bits 4b are regularly arranged in each spoke portion 2b. In addition, other digging members such as a cone head type roller bit may be provided in the hub part 2a. Furthermore, in addition to the drill bit 4b, other digging members such as a hobbing drill bit may be provided in the spoke portion 2b.

As shown in FIGS. 1 and 2(a) , in the outer peripheral ring portion 2d, a plurality of drill bits 4c are arranged and installed in front of the excavation surface side with their cutting edges facing the outer peripheral side. Furthermore, two drill bits 4d called copy bits, for example, are provided on the outer peripheral surface of the outer peripheral ring portion 2d so as to become opposite poles. This drill bit 4d has functions such as over-excavation during sharp curved line construction or posture control of the soil pressure shield excavator 1.

Furthermore, as shown in FIG. 2(a) , additive material injection portions 5a1, 5a2, 5a3, and 5a4 are provided in the hub portion 2a and the spoke portion 2b. These additive material injection parts 5a1 to 5a4 are components for injecting mud materials such as bentonite-based additive materials toward the excavation surface in front of the cutter head 2 so as to be dispersed on the cutter head 2 The status configuration on different rotation trajectories in the front. Thereby, since the injection control of the additive material can be made more diversified, the plastic fluidization of the excavated soil and sand can be performed more accurately and more efficiently. In addition, the additive material injection part 5a2 and the additive material injection parts 5a3 and 5a4 are arrange|positioned so that the additive material injection part 5a1 in the center may be separated left and right. This allows the additive material to spread over a wider range in the front surface of the tool head 2 . In addition, among the additive materials injected from each of the additive material injection parts 5a1 to 5a4, bubble materials may be used instead of bentonite-based additive materials, or both bentonite-based additive materials and bubble materials may be used.

A restriction protrusion 2f is provided in the center between the adjacent spoke portions 2b and 2b in the intermediate ring portion 2c. The soil and sand dug by the cutter head 2 are introduced into the chamber CR (see Figure 1) through the through hole 2e. The restriction protrusion 2f regulates the passage of boulders or pebbles in the ground by regulating the opening area of the through hole 2e. The through hole 2e enters the portion inside the chamber CR. A drill bit 4b is also provided on the surface of the restriction protrusion 2f.

On the other hand, as shown in FIG. 1 , the machine body 3 includes a girder front body plate 3 a and a rear body plate 3 b of a tail part behind the girder. The front trunk plate 3a and the rear trunk plate 3b are formed of, for example, a cylindrical steel plate, and serve to form the outer shape of the machine body 3 and form a hollow space inside the machine body 3. The front end portion of the front trunk plate 3a and the rear trunk plate 3b are engaged by being in contact with the inner peripheral surface of the front trunk plate 3a on the rear end side of the front trunk plate 3a.

On the front side of the front trunk plate 3a, at a position retreating from the front to the inside of the machine body 3, a dividing wall plate is provided to divide the hollow space in the machine body 3 into the excavation surface side and the machine inside. (Partition wall)7. The chamber CR is provided closer to the excavation surface than the partition plate 7 (that is, the space between the cutter head 2 and the partition plate 7), and closer to the inside of the machine than the partition plate 7. At , an additive material injection part 5b, a cutter driving body 8, a center folding jack 9a, a shield jack 9b, and a screw conveyer 10 are provided.

The chamber CR is a space for introducing soil, sand, etc. excavated by the cutter head 2 . In the chamber CR, a cylindrical or other kneading rod (stirring means, first stirring rod) 15 protruding into the chamber CR is provided on the front face of the partition wall plate 7 . That is, the kneading rod 15 is fixed to the partition wall plate 7 without moving.

On the other hand, a cylindrical or other kneading rod (stirring means, second stirring rod) 16R (rotational movement side) protruding into the chamber CR and a triangular prism or other kneading wing 16W are provided on the back surface of the cutter head 2 . That is, the kneading rod 16R and the kneading wing 16W are fixed to the cutter head 2 and rotate and move as the cutter head 2 rotates.

The mixing rods 15 and 16R and the mixing wings 16W have the function of mixing and stirring the soil and sand entering the chamber CR and the additive materials injected into the chamber CR when the cutter head 2 rotates. In addition, additives may be injected from the kneading rod 15 .

The additive material injection part 5b is a part for injecting additives toward the outer periphery of the machine body 3 and into the chamber CR, and is provided on the partition wall plate in a state where the injection port of the additive material injection part 5b is exposed to the outside of the machine body 3 7 near the outer perimeter. The additive material injected from the additive material injection part 5b is a mud material such as a bentonite-based additive material. In addition, the additive material injected from the additive material injection part 5b may be a bubble material instead of a bentonite-based additive material, or both a bentonite-based additive material and a bubble material may be used.

The tool driving body 8 is a driving source for rotating the tool head 2 . Here, as for the tool driving method, the intermediate support driving method is exemplified. The tool driving body 8 is as shown in Figure 1. A plurality of them are arranged in an array along the circumferential direction of the cutter head 2 at positions approximately between the center of the plane and the outer periphery. In addition, the symbol 8TA shows the torque arm.

The center folding jack 9a is a machine that connects the front body plate 3a and the rear body plate 3b and corrects the propulsion direction of the soil pressure shield excavator 1. As shown in Figure 1, the center folding jack 9a spans the front body plate 3a and the rear body plate 3b in the machine body 3. A plurality of shield shields are arranged along the circumferential direction of the soil pressure submersible shield excavator 1 at the junction of the trunk plate 3b. By supplying pressure oil to the center folding jack 9a and pushing the soil pressure submersible shield excavator 1 while bending the front trunk plate 3a and the rear trunk plate 3b into a preset direction and angle, the soil pressure can be controlled. The propulsion direction of the shield excavator 1.

The shield jack 9b is a machine used to obtain a reaction force from the segment SG provided at the rear of the machine body 3 to generate a propulsive force that causes the soil-pressed shield excavator 1 to move forward. As shown in Figure 1, in As shown in FIG. 2(b) , a plurality of shields are arranged in the machine body 3 and arranged along the circumferential direction of the soil pressure shield excavator 1 at a position across the boundary between the front body plate 3a and the rear body plate 3b.

The screw conveyor 10 is a machine for discharging the soil and sand introduced into the chamber CR to the outside. As shown in FIG. It is provided in a state of continuously extending obliquely upward toward the discharge end portion 10b disposed behind the machine body 3 . In addition, although it is not particularly limited, the outer diameter of the screw conveyor 10 is, for example, about 850 mm.

As this screw conveyor 10, for example, a ribbon type screw conveyor is used. That is, a spiral blade 10c without a rotation axis is provided in the tube of the screw conveyor 10 in a rotatable state. In the case of a screw conveyor having a rotating shaft, it is easy to be blocked by gravel, etc. On the other hand, in the case of a belt-shaped screw conveyor 10, the maximum diameter of the gravel, etc. that can be transported can be set to It is larger than the radius of the road, so it can also transport huge gravel, etc. that cannot be transported by a screw conveyor with a rotating shaft. Therefore, since the boulders can be discharged by the screw conveyor 10 out, so the boulders can be introduced into the chamber CR without being broken as much as possible.

A drain pipe (not shown) is connected to the discharge end 10b behind the screw conveyor 10, and the soil and sand transported to the discharge end 10b by the screw conveyor 10 are transported to the waste soil removal trolley through the drain pipe. (not shown) etc. In addition, although it is not particularly limited, the outer diameter of the soil discharge pipe is, for example, about 600 mm, and the length is, for example, about 30 m.

Furthermore, the earth pressure submersible shield excavator 1 of this embodiment is equipped with a sensor unit such as an earth pressure detection unit and a temperature sensor that are not shown in the figure. The earth pressure detection unit is a sensor unit that detects the pressure of soil in the chamber CR, and is installed in a state where the earth pressure detection surface faces the inside of the chamber CR. The soil pressure in the chamber CR can be measured by the soil pressure detection unit, and the soil pressure in the chamber CR can be managed so that the measured value falls within a preset value range, thereby ensuring the stability of the excavation surface while maintaining the stability of the excavation surface. Excavation processing.

Furthermore, the temperature sensor is a sensor part that detects the temperature of the excavated soil and sand (hereinafter referred to as soil and sand temperature), and is provided in the front surface and the outer peripheral surface of the tool head 2 . The temperature sensor is composed of, for example, a sheathed thermocouple. The temperature sensor composed of the sheathed thermocouple is not prone to failure, is cheap, and does not take up space. Therefore, a plurality of them can be arranged on the tool head 2 . Therefore, the measurement accuracy of the soil and sand temperature on the front surface and the outer periphery of the tool head 2 can be improved. The plurality of temperature sensors are arranged in a state of being dispersed on different rotation trajectories (that is, at different positions in the radial direction of the tool head 2) in the front surface of the tool head 2.

Furthermore, the temperature sensor is electrically connected to the above-mentioned control part C (see FIG. 1 ). Furthermore, in the control unit C, the temperature of the soil and sand is measured in real time, and the temperature distribution in the front surface and the outer peripheral surface of the tool head 2 is graphed (visualized) based on the temperature information sent from the temperature sensor. , and adjust the injection conditions of additive materials.

The earth-pressure submersible shield excavator 1 of this embodiment is particularly suitable for excavating natural foundations containing pebbles mixed with gravel (although not particularly limited, but with a diameter of about 600 mm, for example) or pebbles. However, it can also be applied to a pebble-mixed gravel layer without boulders, a pebble layer or a general gravel layer.

Next, the kneading rods 15 and 16R of the soil pressure shield excavator 1 according to this embodiment will be described with reference to FIGS. 3 to 6 .

Figure 3 is a front view of the cutter head of the soil pressure submersible shield excavator of Figure 1. In addition, in FIG. 3 , the kneading rods 15 and 16R, the kneading wings 16W, etc. on the back side of the cutter head 2 are seen through. In addition, although FIG. 3 is a front view, the kneading rod 15 is hatched in order to make it easy to see the figure.

As shown in FIG. 3 , the kneading rod 15 and the kneading rod 16R are arranged so as not to collide with each other when the cutter head 2 rotates. That is, the installation position of the kneading rod 15 in the radial direction of the cutter head 2 and the installation position of the kneading rod 16R in the radial direction of the cutter head 2 are different from each other. Here, for example, one kneading rod 16R is provided between the two kneading rods 15 and 15 in the radial direction of the cutter head 2 .

Furthermore, FIG. 4 is an enlarged sectional view of the main part of the front end of the soil pressure shield excavator in FIG. 1 , and FIG. 5 is an enlarged side view of the main part of the kneading rod of the soil pressure shield excavator in FIG. 4 . In addition, FIG. 4 is a cross-sectional view, but in order to make the drawing easier to read, the drill bit and the hatching are omitted.

As shown in FIGS. 4 and 5 , the kneading rod 15 and the kneading rod 16R extend to a position where their respective front ends partially overlap when viewed from the side. The kneading rod 15 has a replacement part 15a on the front end side and an existing part 15b on the base end (leg) side, and is configured to be able to replace the front end side of the kneading rod 15.

Here, when the front end side of the kneading rod 15 cannot be replaced, for example, when the excavation target site contains boulders, the kneading rod 15 may be bent or worn due to the collision of the gravel with the kneading rod 15 or the like. In particular, the kneading rod 16R fixed to the cutter head 2 moves as the cutter head 2 rotates. Therefore, when gravel and the like collide, the impact force can be dispersed and damage or wear is less likely to occur. In contrast, the kneading rod 15 fixed to the partition wall plate 7 cannot disperse the impact force when gravel or the like collides, making it easy to cause damage or wear. etc., there will be a problem that the mixing performance of the kneading rod 15 is reduced.

On the other hand, in this embodiment, after the replacement part 15a at the front end of the kneading rod 15 is bent or worn, the replacement part 15a can be removed and replaced with a new one, thereby preventing performance degradation of the kneading rod 15. However, like the kneading rod 15, the front end of the kneading rod 16R can be replaced. Furthermore, the front ends of both the kneading rods 15 and 16R may be exchangeable.

Furthermore, in this case, the "front end side" of the kneading rod 15 or the kneading rod 16R refers to a predetermined length including the front end.

As shown in FIG. 5 , the length L1 of the replacement portion 15 a of the kneading rod 15 is longer than the length L2 of the portion where the kneading rods 15 and 16R overlap each other in side view (hereinafter referred to as the overlap length). Damage or wear of the kneading rod 15 is likely to occur at the portion where the kneading rods 15 and 16R overlap each other in side view. Therefore, assuming that the length L1 of the replacement portion 15a of the kneading rod 15 is set shorter than the above-mentioned overlap length L2, The existing portion 15b of the kneading rod 15 will fall within the range of the overlap length L2, and damage or wear will occur in the existing portion 15b. On the other hand, by setting the length L1 of the replacement part 15a of the kneading rod 15 to be longer than the above-mentioned overlap length L2, the existing part 15b does not fall within the range of the overlap length L2, so it is possible to suppress or prevent the existing part 15b from falling within the range of the overlap length L2. 15b Damage or wear occurs.

Moreover, Figure 6(a) is a partially cutaway main part side view of the kneading rod with a replacement part, Figure 6(b) is a front view of the kneading rod of Figure 6(a), and Figure 6(c) is a view along the center Figure 6(a) is a cross-sectional view of the main part of the kneading rod when the shaft is cut, and Figure 6(d) is an enlarged cross-sectional view of the part surrounded by the dotted line in Figure 6(c).

As shown in FIGS. 6(a), (c), and (d), the replacement part 15a and the existing part 15b of the kneading rod 15 are formed at the interface of the replacement part 15a and the existing part 15b in the outer periphery of the kneading rod 15. The joint Engagement. As shown in FIGS. 6(c) and (d) , the joint part J is formed at the boundary between the replacement part 15a and the existing part 15b in the outer circumference of the kneading rod 15 by welding the part of the groove V. The groove V is formed by The kneading rod 15 is recessed toward the central axis to form a V-shape in cross-section. In this way, by providing the groove V, the replacement part 15a and the existing part 15b of the kneading rod 15 can be easily welded, and the joint strength of the replacement part 15a and the existing part 15b can be improved.

Furthermore, as shown in FIGS. 6(a) and (c) , the replacement part 15a and the existing part 15b of the kneading rod 15 are provided with a concave-convex fitting part F formed by concave-convex fitting. Here, for example, a convex part CP is provided at the center of the facing surface of the replacement part 15a of the kneading rod 15, and a recessed part DP is provided at the center of the facing surface of the existing part 15b, and the convex part CP of the replacement part 15a is It is fitted into the recessed portion DP of the existing portion 15b. Thereby, the strength of the joint part between the replacement part 15a and the existing part 15b of the kneading rod 15 can be improved with respect to the force from the transverse direction intersecting the central axis of the kneading rod 15. However, the positions of the convex portion CP and the concave portion DP are not limited to the center of each opposing surface, but may also be offset from the center of each opposing surface.

Furthermore, Fig. 7(a) is a partially cutaway side view of a modification of the kneading rod having a replacement part, Fig. 7(b) is a front view of the kneading rod of Fig. 7(a), and Fig. 7(c) This is a cross-sectional view of the main part of the kneading rod in Figure 7(a) taken along the central axis.

In this modification, as shown in FIG. 7 , two convex portions CP are provided on the opposing surfaces of the replacement portion 15a of the kneading rod 15, and two concave portions DP are provided on the opposing surfaces of the existing portion 15b. The replacement portion The two convex portions CP of the existing portion 15a are fitted into the two concave portions DP of the existing portion 15b. Thereby, the joint strength of the replacement part 15a and the existing part 15b of the kneading rod 15 can be further improved with respect to the force from the transverse direction intersecting the central axis of the kneading rod 15.

In addition, Figure 8(a) is a partially cutaway side view of the main part of another modification of the kneading rod having a replacement part, Figure 8(b) is a front view of the kneading rod of Figure 8(a), and Figure 8(c) This is a cross-sectional view of the essential parts of the kneading rod in Figure 8(a) taken along the central axis.

In this modification, as shown in FIG. 8 , a convex portion CP and a concave portion DP are provided on the opposing surface of the replacement portion 15a of the kneading rod 15, and a concave portion DP and a concave portion DP are provided on the opposing surface of the existing portion 15b. One convex part CP, the convex part CP of the replacement part 15a is fitted into the recessed part DP of the existing part 15b, and the convex part CP of the existing part 15b is fitted into the recessed part DP of the replacement part 15a. Thereby, the joint strength of the replacement part 15a and the existing part 15b of the kneading rod 15 can be improved with respect to the force from the transverse direction intersecting with the central axis of the kneading rod 15, and the convex part of the replacement part 15a of the kneading rod 15 can be increased. The processing of the CP and the convex portion CP of the existing portion 15b becomes easy.

Furthermore, FIG. 9 is an enlarged side view of the main part of yet another modified example of the kneading rod having a replacement part. In this modification, the wing portion WP is provided on the outer periphery of the existing portion 15b of the kneading rod 15. The front end of the wing portion WP is terminated at a position close to the front of the replacement portion 15a so as not to overlap with the replacement portion 15a of the kneading rod 15 when viewed from the side. Thereby, even when the kneading rod 15 is provided with the wing part WP, the replacement part 15a of the kneading rod 15 can be easily replaced.

In addition, wings may be provided on the side of the kneading rod 16R. At this time, the wing portion of the kneading rod 16R is provided so that the wing portion does not contact the kneading rod 15 at the overlapping portion of the kneading rods 15 and 16R. Furthermore, when the front end side of the kneading rod 16R is made replaceable, similarly to the kneading rod 15 , the front end portion of the wing portion of the kneading rod 16R does not overlap with the replacement portion of the kneading rod 16R in side view.

Next, an example of the soil pressure submersible shield construction method of the soil pressure submersible shield excavator 1 in Figure 1 will be described.

In the earth-pressure shield excavator 1 of this embodiment, the machine body 3 is pushed forward while the cutter head 2 is pressed against the excavation surface and rotated, thereby constructing an excavation pit in the ground. Here, for example, a natural foundation containing no more than 20% of fine particles (sand content) with a particle size less than 2 mm and more than 80% of gravel (gravel content) with a particle size of 2 mm or more is used as the excavation target.

During the excavation operation, the above-mentioned additive materials are added to the soil and sand dug with the cutter head 2, and the rotation of the cutter head 2 causes the kneading rod 16R and the like to rotate and move, and the kneading rods 15 and 16R rotate against each other. The soil, sand and additive materials are stirred and mixed, and the excavated soil and sand are converted into soil with plastic fluidity and impermeability. Then, the soil is filled into the chamber CR and the screw conveyor 10, and the filled soil is pressurized by the propelling force of the shield jack 9b to generate soil pressure, and the soil pressure is made to resist the excavation surface. Soil pressure to maintain the stability of the excavation surface.

Furthermore, for example, the rotational speed of the cutter head 2 is set to a constant value, and the extension speed of the shield jack 9b or the rotational speed of the screw conveyor 10 is adjusted, and the soil pressure in the chamber CR is measured by the above-mentioned soil pressure detection unit. And make the soil pressure constant, thereby maintaining the stability of the excavation surface.

Bentonite-based additives added as additives (made as mud materials) not only have the function of improving the plastic fluidity or impermeability of soil and sand, but also have the following functions: they are coated with crushed boulders together with excavated soil and sand. Gravel components such as gravel or pebbles are used so that the gravel components are not separated from the excavation soil and sand, so that the integration of the excavation soil, sand and gravel components is improved.

On the other hand, the bubble material added as an additive material not only has the effect of inhibiting the separation of the above-mentioned gravel components from adhering to the cutter head 2 or the partition plate 7, but also has the following effects: which cannot be obtained by the bentonite-based additive material. The cushioning function improves the compressibility of the excavated soil, sand or mud material to inhibit the rolling movement of the gravel components in the chamber CR or the screw conveyor 10, and even if the rolling movement is performed, the soil pressure will be suppressed by the cushioning function. Rapid changes.

Therefore, even when excavating a natural foundation with a pebble-mixed gravel layer (mixed with boulders that are not suitable for introduction into the chamber CR) or a pebble layer, the soil pressure can be stabilized and the excavation surface can be maintained. The stability also allows the gravel-composed soil of the screw conveyor 10 to move smoothly to prevent clogging and prevent ejection.

Here, when the soil-pressing shield excavator 1 performs excavation work, if the front end of the kneading rod 15 is damaged or abraded due to collision with gravel, etc., the performance of the kneading rod 15 will be reduced. , and will reduce the plastic fluidity of excavated soil and sand. Therefore, in this embodiment, when the front end of the kneading rod 15 is damaged or worn, the digging operation of the shield excavator 1 is stopped, and the replacement part on the front end side of the kneading rod 15 is stopped. After 15a was replaced with a new one, the digging action of the soil pressure shield excavator 1 started again.

Thereby, since the performance of the kneading rod 15 of the soil pressure shield excavator 1 can be prevented from being reduced, the plastic fluidity of the excavated soil and sand can be maintained from the beginning to the end of the excavation work by the soil pressure shield excavator 1 . Therefore, the cutter torque of the soil pressure shield excavator 1 can be reduced from the beginning to the end of the excavation construction. Furthermore, since blockage and eruption caused by excavation of soil and sand can be suppressed or prevented, the number of interruptions in excavation operations caused by blockage and eruption can be reduced. Therefore, since the excavation operation by the earth shield excavator 1 can be performed more efficiently, the excavation period can be shortened, and long-distance construction can be promoted even on a site containing boulders.

The invention developed by the present inventor has been specifically described above based on the embodiments. However, the embodiments disclosed in this specification are examples in all respects and are not limited to the disclosed technology. That is to say, the technical scope of the present invention is not to be interpreted restrictively based on the description of the foregoing embodiments, but should be interpreted based on the description of the patent application scope, and also includes the technology equivalent to the technology described in the patent application scope, and the technology described in the patent application scope. All changes that do not depart from the gist of the patent application.

In the aforementioned embodiment, the case where two kneading rods 15 and one kneading rod 16R are respectively provided has been described, but the embodiment is not limited to this, and various changes can be made.

In addition, in the foregoing embodiment, although the case where the concave portion DP and the convex portion CP are provided on the opposing surfaces of the replacement portion 15a and the existing portion 15b of the kneading rod 15 has been described, it is not limited to this, and may also be shown in FIG. Shown in 10. Figure 10(a) is a partially cutaway side view of a modification of the kneading rod having a replacement part, Figure 10(b) is a front view of the kneading rod of Figure 10(a), and Figure 10(c) is a side view along the Figure 10(a) is a cross-sectional view of the essential parts of the kneading rod when the central axis is cut, and Figure 10(d) is an exploded cross-sectional view of the kneading rod of Figure 10(c).

In this modification, two recessed portions DP are provided on the opposing surfaces of the replacement portion 15a and the existing portion 15b of the kneading rod 15, and two cylindrical rod-shaped rods prepared from different individuals are embedded in each of the recessed portions DP. The embedded rod RP is thereby fitted into the replacement part 15a and the existing part 15b. Thereby, the joint strength of the replacement part 15a and the existing part 15b of the kneading rod 15 can be improved with respect to the force from the transverse direction intersecting the central axis of the kneading rod 15, and the replacement part 15a of the kneading rod 15 and the existing part 15b can be easily connected. Processing of part 15b. However, it is also possible to set the number of recesses DP to one and the number of embedded rods RP to be one. In this case, the shapes of the recessed portion DP and the embedded rod RP when viewed from the front may be made into a polygonal shape such as a hexagon. Thereby, the force exerted along the circumferential direction of the replacement part 15a can be strengthened.

In addition, Figure 11(a) is a partially cutaway main side view of another modification of the kneading rod having a replacement part, (b) is a front view of the kneading rod of Figure 11(a), and (c) is a view along the center 11(a) is a cross-sectional view of the main part when the kneading rod is cut through the axis, and (d) is an enlarged cross-sectional view of the main part of the part surrounded by the dotted line in FIG. 11(c).

In this modification, a recessed portion DP is provided on the opposite surface of each of the replacement portion 15a and the existing portion 15b of the kneading rod 15, and a female thread is provided on the inner wall surface of each recessed portion DP. On the other hand, different individuals are prepared. A cylindrical rod-shaped embedded rod RsP with a male thread is provided on the side, and the embedded rod RsP with the male thread is screwed into the recessed portion DP with a female thread in the replacement part 15a and the existing part 15b. Inside, the replacement part 15a and the existing part 15b are screwed together. When assembling the kneading rod 15 in this case, the embedded rod RsP can be screwed into the recessed portion DP of the existing portion 15b, and then the recessed portion DP of the replacement portion 15a can be aligned with the protruding portion of the embedded rod RsP. The replacement part 15a is rotated, and the protruding part of the embedded rod RsP is screwed into the recessed part DP of the replacement part 15a. Therefore, the joint strength of the replacement part 15a and the existing part 15b of the kneading rod 15 can be improved with respect to the force from the transverse direction intersecting the central axis of the kneading rod 15.

Furthermore, in the foregoing embodiments, the case of using a ribbon screw type screw conveyor has been explained, but this is not limiting, and various changes can be made, such as using a combination of a ribbon type and an attached screw conveyor. Shaft type screw conveyor.

(industrial availability)

In the above description, although the present invention is explained with respect to the case where the present invention is applied to the earth pressure submersible shield excavator of the intermediate support drive system, it is not limited thereto and may also be applied to, for example, the central shaft drive system or the peripheral support drive system. Earth-pressure shield excavators, etc., and other shield excavators.

1: Soil pressure shield excavator

2: Tool head

3a: Front trunk plate

7: Partition wall panel (partition wall part)

8:Tool drive body

8TA: Torque arm

10:Screw conveyor

10a: Soil and sand introduction end

10c:wing plate

15:Mixing stick

15a: Replacement Department

15b: Existing Department

16R: mixing stick

16W: Mixing wing

Claims (6)

A submersible shield excavator is provided with: a cutter disk supported in a state of being freely rotatable along the circumferential direction of the machine body in front of the machine body in the direction of travel; and a partition wall connected to the back of the cutter disk. The chamber is disposed opposite to and blocking the opening of the machine body; the chamber is disposed between the back surface of the cutter disc and the front surface of the partition wall; and the stirring means is for excavation into the chamber. The soil, sand and additives are stirred and mixed; and the aforesaid stirring means is equipped with: a first stirring rod, which is arranged in front of the aforementioned partition wall; and a second stirring rod, which is arranged on the back side of the aforementioned cutter plate, when the aforementioned cutter is The position where the plate does not collide with the first stirring rod when rotating; the front ends of the first stirring rod and the second stirring rod protrude toward the chamber in a manner that they overlap when viewed from the side, and the first stirring rod The rod system has: a replaceable replacement part located on the front end side of the first stirring rod; and an existing part on the partition wall side that is joined to the replacement part; the length of the replacement part of the first stirring rod is longer than The overlapping length of the portions where the first stirring rod and the second stirring rod overlap each other in side view is longer. The submersible shield excavator according to claim 1, wherein the first stirring rod is welded to the replacement part and the existing part. The submersible shield excavator according to claim 2, wherein the replacement part and the existing part of the first stirring rod are set to have the same radial cross section, and the cross sections between the first stirring rod and the first stirring rod are the same. A groove for welding that is recessed toward the central axis of the first stirring rod is provided in the outer periphery at the boundary between the replacement portion and the existing portion. The shield excavator according to claim 1, wherein a concave and convex fitting portion formed by fitting the concavities and convexities to each other is provided on the facing surface of the replacement portion and the existing portion of the first stirring rod. The submersible shield excavator according to claim 4, wherein a convex portion is provided on the facing surface of the replacement portion before the first stirring rod, and a convex portion for the replacement portion is provided on the facing surface before the existing portion. The concave portion into which the aforementioned convex portion fits. The submersible shield excavator according to any one of claims 2 to 5, wherein a wing is provided on the outer periphery of the existing part in front of the first stirring rod, and the front end of the wing is not visible when viewed from the side. It overlaps with the replacement part of the first stirring rod.

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