JP2958196B2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine,
More specifically, after taking excavated earth and sand into the cutter chamber formed between the cutter head and the partition of the shield body, the screw conveyor penetrates the partition and exposes the earth and sand intake to the inside of the cutter chamber. The present invention relates to a shield machine designed to discharge.

[0002]

2. Description of the Related Art Conventionally, in this type of shield machine, the screw blade tip position of a screw conveyor is fixed to a shield body, and the amount of protrusion of the screw blade tip portion into a cutter chamber cannot be changed. It is.

[0003] As a conventional example of a shield excavator in which the amount of protrusion of a screw blade tip of a screw conveyor into a cutter chamber is made variable, there is one described in JP-A-57-51398. On the other hand, the screw conveyor is slidably held in the screw axis direction, and the casing of the screw conveyor and the screw blades are slid together to change the amount of protrusion of the screw blade tips into the cutter chamber. is there.

FIG. 8 is a view showing a state in which the amount of protrusion of the tip of the screw blade of the conventional example is increased. In the screw conveyor 4 ', its casing 4a' is connected to the partition wall 1 of the shield main body.
a and is slidably held in the screw axial direction by being inserted into an annular holder 10 provided in the screw conveyor 4 '. The sliding operation of the screw conveyor 4' is performed by expansion and contraction of a jack 11 interposed between the casing 4a 'and the partition wall 1a. The casing 4a '
The stopper 12 provided on the end of the annular holder 10 abuts against the end face of the annular holder 10 to limit the sliding amount of the screw conveyor 4 'to the cutter chamber 3 side.

[0005]

In a general shield machine in which the tip of the screw blade of the screw conveyor is fixed with respect to the shield body, if the amount of protrusion of the tip of the screw blade into the cutter chamber is small, the screw is not screwed. If the ability of the conveyor itself to take in the earth and sand is reduced and the fluidity of the excavated earth and sand is poor, it is not possible to properly discharge the earth from the cutter chamber, and if the amount of protrusion of the screw blade tip into the cutter chamber is large, In some cases, it is not possible to cope with a change in the properties of excavated earth and sand during construction, for example, a large gravel or the like is caught between the cutter head and the tip of the screw blade, and the tip of the screw blade is likely to be damaged.

In the conventional example shown in FIG. 8, the entire screw conveyor 4 'is slid in the axial direction of the screw to protrude the tip of the screw blade 4b' into the cutter chamber 3 when the fluidity of the excavated earth and sand is poor. When the flow rate of the excavated earth is good and the flowability of the excavated soil is good, the amount of protrusion of the tip of the screw blade 4b 'is reduced, so that a good earth removal is always performed. However, in this conventional example, the relative positional relationship between the screw conveyor casing 4a 'and the screw blade 4b' does not change even if the amount of protrusion of the screw blade tip portion is increased, and the circumference of the screw blade tip portion does not change. Since the sediment can be taken in only from the part, the ability of the screw conveyor itself to take in the soil is not very good.

[0007] It is an object of the present invention to improve the ability of the screw conveyor itself to take in earth and sand so that excavated earth and sand in a wide range of soils, from earth having good fluidity to earth having poor fluidity, can be discharged well. To provide a shield excavator that can be used properly according to the properties of excavated soil, such as being able to avoid engraving of large gravel etc. between the cutter head and the tip of the screw blade when excavating the gravel layer. is there.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a shield body, a cutter head rotatably mounted on a front surface of the shield body, and a cutter head and a partition wall of the shield body. A cutter chamber formed between the cutter chamber and a screw conveyor that penetrates through the partition wall and has a sediment intake opening facing the inside of the cutter chamber. while in the shield machine to discharge, to fix the sand inlet side end portion of the screw conveyors of the casing to the partition wall by the Ke
Of the screw conveyor or the screw of the screw conveyor
Detachable joint between the screw shaft and the output shaft of its drive
Providing a supplementary member, and attaching and detaching the supplementary member,
Screw the screw blades of the screw conveyor in the axial direction
It is configured to be able to change the amount of protrusion of the tip of the screw blade into the cutter chamber by sliding relative to the sawing.

[0009]

The screw blade is slid in the axial direction while the end of the screw conveyer casing on the side of the earth and sand inlet is fixed to the partition wall, thereby changing the amount of protrusion of the screw blade tip into the cutter chamber. . When only the screw blade tip protrudes into the cutter chamber,
The excavated earth and sand in the cutter chamber can be taken in from the entire circumference in the radial direction of the tip of the screw blade and can be sequentially conveyed by the rotation of the screw blade. Therefore, even when the fluidity of the earth and sand is poor, the earth and sand can be easily taken in. Further, in a state where the screw blade tip is retracted from the inside of the cutter chamber, it is possible to prevent large debris or the like in earth and sand from being caught between the cutter head and the screw blade tip, thereby damaging the screw blade tip.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 6 and FIG. 7 are side sectional views of a main part of a shield machine according to the present invention. A cutter head 2 is rotatably installed on the front surface of a shield body 1, and a partition wall between the cutter head 2 and the shield body. 1a, a cutter chamber 3 is formed. Reference numeral 4 denotes a screw conveyor for discharging the earth, which is installed with the earth and sand intake 4c facing the inside of the cutter chamber 3 through the partition wall 1a. The screw conveyor has an end on the side of the earth and sand intake of the cylindrical casing 4a fixed to the partition wall 1a, and discharges the soil from the cutter chamber 3 by rotation of a spiral screw blade 4b housed in the casing 4a. That is, while rotating the cutter head 2 by the cutter driving device 5 installed behind the partition wall 1a, the cutter head 2 is advanced by the shield jack (not shown) together with the shield main body 1 to excavate the face, and the excavated earth and sand is removed by the cutter chamber 3. Then, the excavated earth and sand is conveyed backward by the screw conveyor 4 and discharged from the cutter chamber 3.

The screw conveyor 4 shown in FIG. 6 and FIG.
The screw blade 4b is slid in the axial direction while the end of the casing 4a on the side of the earth and sand inlet is fixed to the partition wall 1a, so that the amount of protrusion of the screw blade tip into the cutter chamber 3 can be changed. FIG. 6 shows a state in which the tip of the screw blade is projected into the cutter chamber 3, and FIG. 7 shows a state in which the tip of the screw blade is withdrawn from the inside of the cutter chamber 3.

FIGS. 1 to 3 are views showing an example of a specific structure for sliding the screw blade 4b in the axial direction. 1 and 2, reference numeral 6 denotes a detachable liner interposed in the middle of the casing 4a. The detachable liner 6 is divided into two semicircles so that the screw blade 4b can be attached and detached without being pulled out. The screw conveyor 4 is mounted so as to form a part of a casing of the screw conveyor 4 by tightening the two flanges 4d and 4e provided at the intermediate portion with bolts (not shown). 4f is a driving device of the screw conveyor 4; 4g is a soil discharge port of the screw conveyor 4;
h is a jack for opening and closing the gate of the earth and sand discharge port 4g.

Here, the axial length L of the liner 6 is set to a length corresponding to about one pitch of the screw blades 4b, and as shown in FIG.
If the tip of b is located just at the end of the casing 4a on the side of the earth and sand intake, the liner 6 is removed and the gap between the flanges 4d and 4e of the casing 4a is packed and fastened. The screw blade 4b is longer than the state shown in FIG.
Side, and only the screw blade tip protrudes into the cutter chamber 3. Thus, in this example, the screw blade 4b is slid in the axial direction by attaching and detaching the liner 6,
The amount of protrusion of the screw blade tip into the cutter chamber 3 can be changed.

FIGS. 4 and 5 show another example of a specific structure for sliding the screw blade 4b in the axial direction.
Is the screw shaft of the screw conveyor 4, 4k is the output shaft of the driving device of the screw conveyor 4, and 7 is the screw shaft 4 at one end.
j, the other end side of which is slidably fitted to the drive device output shaft 4k, 8a and 8b are two front and rear pin holes provided in the sleeve 7 at intervals in the axial direction, and 8c is A pin hole provided at the end of the drive device output shaft 4k on the sleeve 7 side. The pin 9 is inserted through one of the pin holes 8a and 8b and the pin hole 8c so that the screw shaft 4j is connected to the drive device. The output shaft 4k is connected to the sleeve 7 via the pin 9 to transmit the rotational force and the thrust load. FIG. 4 shows a state where the pin 9 is inserted into the pin holes 8a and 8c.
FIG. 5 shows a state in which the pin 9 is inserted into the pin holes 8b and 8c. By replacing the pin 9 from the pin hole 8a to the pin hole 8b, the screw blade 4b is moved by the distance L 'between the pin holes 8a and 8b. It is slid to the cutter chamber side. Therefore, the interval L 'is set to a length corresponding to about one pitch of the screw blade 4b, and the pin holes 8a and 8c are
When the pin 9 is inserted into the pin hole 8b and the pin hole 8c, if the screw blade tip is located exactly at the end of the casing 4a on the earth and sand intake side as shown in FIG. As shown in FIG. 6, only the tip of the screw blade is projected into the cutter chamber 3 by the distance L ', that is, about one pitch. As described above, in this example, the screw blade 4b is slid in the axial direction by replacing the pin 9 with the sleeve-side pin holes 8a and 8b to change the amount of protrusion of the screw blade tip into the cutter chamber 3. Can be. The operation of replacing the pin 9 and sliding the screw blade 4b can be performed through the earth and sand discharge port 4g of the screw conveyor. The sleeve 7 may be fixed to the drive device output shaft 4k, and a pin may be inserted into one of the plurality of pin holes provided in the sleeve 7 and the pin hole provided in the screw shaft 4j.

6 and 7, the screw conveyor 4
Takes in earth and sand within a range of about one pitch at the tip of the screw blade 4b, and sequentially conveys the earth and sand by rotating the screw blade 4b. As shown in FIG. 6, with the end of the screw conveyer casing 4a on the side of the earth and sand intake opening fixed to the partition wall 1a, only the range of about one pitch of the tip of the screw blade that most contributes to earth and sand intake is set in the cutter chamber 3. 8, the screw blades and the casing can protrude into the cutter chamber together, so that sediment can be taken in from the entire circumference in the radial direction of the screw blade 4b. improves.

In the state where the tip of the screw blade protrudes into the cutter chamber 3, if there is a possibility that large gravel or the like may bite between the cutter head 2 and the tip of the screw blade 4 b, FIG. By retracting the tip of the screw blade from the inside of the cutter chamber 3 as described above, biting of large gravel or the like can be eliminated, and damage to the tip of the screw blade can be prevented.

[0018]

According to the shield machine of the present invention, the screw conveyor slides the screw blades in the axial direction thereof while the earth and sand intake side end of the casing is fixed to the partition wall, and is inserted into the cutter chamber. It is configured so that the amount of protrusion of the screw blade tip portion can be changed, so that only the screw blade tip portion that most contributes to sediment intake is protruded into the cutter chamber, whereby the screw blade and the casing are protruded together. Compared to the conventional example of FIG. 8, the screw conveyor has improved the ability to take in the earth and sand, and has a good ability to discharge a wide range of excavated earth and sand from high-flow soil to low-flow earth, and has a shield excavator. Excavation efficiency can be increased.

In the state where the tip of the screw blade is protruded into the cutter chamber, if there is a possibility that large gravel or the like may bite between the cutter head and the tip of the screw blade,
By retracting the tip of the screw blade from inside the cutter chamber, it is possible to eliminate the gravel and the like and prevent the tip of the screw blade from being damaged. You can use them properly.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a screw conveyor part according to an embodiment of the present invention, partially cut away.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a partially cut-away side view of the embodiment shown in FIG. 1 in a state where the screw blade is slid toward the cutter chamber.

FIG. 4 is a side view of a screw conveyor according to another embodiment of the present invention, partially cut away.

FIG. 5 is a partially cut-away side view of the embodiment shown in FIG. 4 in a state where the screw blade is slid toward the cutter chamber.

FIG. 6 is a sectional side view of a main part showing a state in which a tip end of a screw blade of the shield machine according to the present invention is protruded into a cutter chamber.

FIG. 7 is a sectional side view showing a main part of the shield excavator according to the present invention, in which a screw blade tip is retracted from the inside of a cutter chamber.

FIG. 8 is a sectional side view of a main part of a conventional shield machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Shield main body, 1a ... Partition wall, 2 ... Cutter head, 3
... Cutter chamber, 4 ... Screw conveyor, 4a ... Screw conveyor casing, 4b ... Screw blade, 4c
... Soil inlet of screw conveyor, 4f ... Screw conveyor drive, 4j ... Screw shaft, 4k ... Driver output shaft, 6 ... Liner, 7 ... Sleeve, 8a, 8b, 8c ... Pin hole, 9 ... Pin.

Claims (3)

(57) [Claims] 1. A shield body, a cutter head rotatably installed on a front surface of the shield body, a cutter chamber formed between the cutter head and a partition of the shield body, and a cutter penetrating the partition. and a screw conveyor to face the sand inlet into the cutter chamber, after capturing the earth and sand excavated by the cutter head to the cutter chamber, the shield machine which is adapted to discharge the screw conveyor, the screw conveyors of sediment inlet side end portion of the casings <br/> grayed remains fixed to said partition wall, said
The middle part of the casing or the screw conveyor
Detachable joint between the screw shaft and the output shaft of its drive
A supplementary member is provided, and by attaching and detaching the supplementary member,
Screw the screw blade of the screw conveyor in the axial direction
A shield excavator characterized in that the shield excavator is configured to slide relative to a casing so as to change an amount of protrusion of a tip end of a screw blade into a cutter chamber. Wherein said replenishing member is constituted by a detachable liner wear in the middle portion of the casing, and the casing of the screw vanes in the axial direction by attachment and detachment of the liner
Shield machine according to claim 1, characterized in that the so that are relatively slid. 3. The screw connection member according to claim 1 , wherein
A sleeve fixed to one of the bare screw shaft and the output shaft of the drive device and slidably fitted to the other shaft, and a plurality of sleeves provided at intervals in the axial direction on the sleeve. It consists of a pin which is inserted over one of the pin holes and the pin hole provided in the other shaft, and the screw vanes in the axial direction the casing by a pin replacement of the pin hole of the sleeve side Ru is relatively sliding
Shield machine according to claim 1, characterized in that there was Unishi.