JPS6160237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mud water pressurized shield tunneling machine.

A conventional mud water pressurizing shield tunneling machine, for example, as shown in _FIG . The partition wall c
A pressure chamber d is provided between the cutter head b and the cutter head b,
A mud feeding pipe e for supplying muddy water is connected to the pressure chamber d, and a mud draining pipe f is also connected to the pressure chamber d, and muddy water is supplied to the pressure chamber d through the mud feeding pipe e and is pressurized to face the face surface. The excavated earth and sand are discharged together with mud water from the mud removal pipe f by the rotation of the cutter head b while preventing the face from collapsing.
As shown in FIG. 1, the supporting means generally includes a rearward-facing cutter head drive shaft g provided in the center of the cutter head b, and a cutter head drive shaft g that extends through the partition wall c. The shaft g for driving the cutter head extends rearward and is supported by a bearing h attached to a member projecting inward from the shield main body a.
A cutter head driving gear i is provided at the rear end, and the cutter head driving gear i is connected to a pinion k of a motor j.
This structure is such that the cutter head b is rotated by the drive of the motor j. In the case of such a structure, since the pressure chamber d is formed over the entire inside of the shield body a except for the shaft g for driving the cutter head, the pressure in the pressure chamber d is well opposed to the entire face surface, which prevents the face from collapsing. , there are no obstructions in the pressure chamber d, and the pressure inside the pressure chamber d is maintained at a predetermined pressure by controlling the supply and discharge of the sludge pipe e and the sludge removal pipe f that directly communicate with the pressure chamber d. This allows excavated earth and sand to be discharged from the mud removal pipe b along with muddy water while preventing the face from collapsing.On the other hand, only the cutter head drive shaft g installed in the center of the shield body a receives the load applied to the cutter head b. Therefore, there is a restriction in terms of strength, and it is inevitable that the strength of the cutter head b and the shaft g for driving the cutter head must be increased, which is not only uneconomical, but also because the cutter head support and drive part are located in the center of the shield body a. Therefore, there is a drawback that the usable range within the shield body a is limited.

A mud water pressurized seal excavator that avoids the drawbacks of the above-mentioned general cutter head support means in such conventional mud water pressurized seal excavators is also disclosed in Japanese Patent Application Laid-Open No. 53-146448, which was issued after the filing of the present application. Disclosed in the official gazette. That is, the mud water pressure seal excavator disclosed in Japanese Patent Application Laid-Open No. 146448/1983 is the second
As shown in the figure, a cutter head b having an intake port b ₁ is arranged on the front surface of the shield body a, and the rear end of a conical shaft l integrally formed to protrude from the cutter head b is connected to the shield body a. It is rotatably supported by a bearing m attached to a member extending inward from the
A chamber p is formed within the conical shaft l by its peripheral wall and bulkhead, and
A large number of pores q are formed in the peripheral wall of the shaft, and the pores q communicate with a chamber r formed between the peripheral wall of the conical shaft l and the shield body a, and there is no flow to the chamber r. It has a structure in which the mud pipe e and the mud drain f are in communication. In the case of this structure, the load applied to the cutter head b is received by the conical shaft l, so there are no restrictions on strength, and since the cutter head support part and drive part are not in the center of the shield body a, they can be placed inside the shield body a without getting in the way. While the range of use is widened, the earth and sand excavated by the cutter head b enters the chamber p formed in the conical shaft l through the intake port b, but the chamber p is connected to the peripheral wall that rotates together with the cutter head b. Since the chamber P is surrounded by the chamber P and the bulkhead, the sediment in the chamber P rotates together with them while being surrounded by them (similar to the sediment in the bucket), and the discharge function is extremely poor. It cannot be discharged unless it passes through the pores q in the surrounding wall. Therefore, if the excavated soil contains gravel with a diameter larger than the pore q, it cannot be discharged, and if the excavated soil has small particles and is sticky, it cannot be discharged. The hole q becomes clogged and cannot be discharged, and the mud feeding pipe e
The discharge pipe f is only in communication with the chamber r formed between the peripheral wall of the conical shaft l and the shield body a, and the conical shaft l maintains pressure against the face. Since the chamber r communicates with the inner chamber p through the pore g, the chamber r and the chamber p do not necessarily have the same pressure immediately. Sludge pipe f
Even if the pressure in the chamber r is controlled by controlling the supply and discharge of the gas, it is not always possible to control the pressure in the chamber p that opposes the face, which has the disadvantage that collapse of the face cannot be reliably prevented. be.

The present invention solves the drawbacks of the conventional and proposed shields as described above, and allows for a wider space in the center of the shield body, as well as stable and inexpensive support for the cutter head. Moreover, not only can collapse of the working face be reliably prevented, but also the pressure in the pressure chamber opposing the working face can be ensured to a predetermined pressure that prevents the working face from collapsing by controlling the supply and discharge of the mud feeding pipe and mud removal pipe. The object of the present invention is to provide a mud water pressurizing type seal excavator that can be maintained at a high temperature.

Embodiments of the present invention will be described below with reference to FIGS. 3 to 7.

Reference numeral 20 in the drawings indicates a cylindrical shield main body, and a cutter head support structure B is provided in the inner cylindrical portion of the shield main body 20.

The cutter head support structure B includes a ring-shaped cutter head support 21 fixed to the inner periphery of the shield body 20, and a ring-shaped support part 2 on the inner periphery of the cutter head support 21.
7 is fixed, and the central space of the ring-shaped support portion 27 is closed off by a partition wall 33.

On the other hand, 22 is a cutter head, and the cutter head 22 is provided with a plurality of earth and sand intake ports 23 in a radial manner, and a cutter 24 is installed in proximity to each of the earth and sand intake ports 23 ( (See Figure 4). Further, as shown in FIG. 7, a plurality of support legs 25, for example three support legs 25, are provided on the rear surface of the cutter head 22 to protrude rearward, and the ends of these support legs 25 are connected to a ring-shaped receiving member 26. These cutter head 22, support leg 25 and receiving member 26
is formed in one piece.

In the ring-shaped support part 27 of the cutter head support structure B, as shown in FIG.
The sealing mechanism C is supported via an inner seal member 28a and an outer seal member 28b, thereby providing an intake chamber A between the cutter head 22 and the cutter head support structure B.

Further, an inner ring side 29a of a bearing body 29 is fixed to the support portion 27 of the cutter head support structure B, and an outer ring side 29b of the bearing body 29 is a ring-shaped receiving member provided at the end of the support leg 25. It is fixed at 26. A gear 30 is formed on the outer ring side 29b of the bearing body 29, and the gear 30 meshes with a pinion 32 of a drive motor 31 fixed to the support portion 27.

In addition, in FIG. 3, 34 is an agitator;
5 is a mud feeding pipe, and 36 is a mud draining pipe.

Therefore, due to the rotational drive of the drive motor 31,
The outer ring side 29b of the bearing body 29 is rotated through the pinion 32 and the gear 30, and the receiving member 26 and the support leg 2 are rotated.
5 to rotate the cutter head 22. Due to this rotation of the cutter head 22, the earth and sand excavated by the cutter 24 is taken into the intake chamber A formed between the cutter head 22 and the cutter head support structure B through the earth and sand intake port 23. Mud water is introduced into the intake chamber A from the mud feed pipe 35, and by the operation of the agitator 34, the excavated earth and sand are stirred together with the mud water to form a slurry, and the excavated soil is maintained at a predetermined pressure and sent to the face. The sludge is taken out to the outside through the sludge pipe 36 while facing against the surface to prevent the face from collapsing.
Note that even when the excavated soil is made into a slurry and taken out from the slurry drain pipe 36, it is taken out so that the pressure inside the intake chamber A is maintained at a predetermined pressure.

As described above, the mud water pressurizing type seal excavator according to the present invention is provided with the cutter head support structure B having the ring-shaped support part 27 whose central space is closed by the partition wall 33 in the shield main body 20. A plurality of support legs 25 are provided protruding from the rear surface of the cutter head 22 having the inlet 23, and a ring-shaped receiving member 26 is provided at the end of the support legs 25.
Ring-shaped receiving member 2 in the cutter head 22
6 is attached to the support portion 27 of the cutter head support structure B so that the cutter head 22 is located on the front surface of the shield main body 20 and that the cutter head 22 is installed over the entire inside of the shield main body 20 between the cutter head 22 and the cutter head support structure B. The intake chamber A is rotatably supported via a sealing member C, and a sludge feed pipe 35 and a sludge discharge pipe 36 are connected to the intake chamber A.
The torque required for excavation is transmitted to the cutter head 22 via the ring-shaped receiving member 26 and the plurality of support legs 25, and
Conversely, the load applied to the cutter head 2 is supported by the ring-shaped support portion 27 of the cutter head support structure B via the plurality of support legs 25 and the ring-shaped receiving member 26, so that the load applied to the cutter head 2 is supported over a wide area. As a result, there are fewer restrictions on strength, making it stable and inexpensive, and the cutter head 22
Since the ring-shaped receiving member 26 is supported by the ring-shaped support part 27 of the cutter head support structure B provided inside the shield body 20, the space in the center part inside the shield body 20 can be widened. This allows the shield main body 20 to be used in a wider range of applications.

Further, the earth and sand excavated by the rotation of the cutter head 22 is taken into the intake chamber A through the earth and sand intake port 23, and the intake chamber A extends over the entire inside of the shield body 20. Since the intake chamber A is formed in the shield main body 20 and cutter head support structure B which are fixed, a large amount of soil can be taken in and can be applied against the entire face surface. Since it is, Katsutahed 22
Even if the cutter head 22 rotates, a phenomenon in which the entire earth and sand in the intake chamber A is rotated with the rotation of the cutter head 22 does not occur, which impairs the function of discharging the earth and sand in the intake chamber A. In addition, since there are only a plurality of support legs 25 in the intake chamber A, there is no risk of any harmful effects; rather, the rotation of the support legs 25 as the cutter head 22 rotates As a result, the excavated earth and sand in the intake chamber A and the mud pipe 3
This has the effect of actively mixing and stirring the muddy water supplied through the slurry to form a good slurry and promoting the discharge function. By being directly connected to the chamber A, the supply and discharge of the sludge feed pipe 35 and the sludge removal pipe 36 are controlled, so that the intake chamber A needs to maintain pressure against the face. The pressure in the intake chamber A that needs to be maintained at a predetermined pressure can be maintained at a predetermined pressure, and excavation can be promoted while reliably preventing the face from collapsing.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional general mud water pressurizing seal excavator, Fig. 2 is a longitudinal sectional view of a mud water pressurizing seal excavator proposed before the filing of the present application, and Fig. 3 is a longitudinal sectional view of an embodiment of the mud water pressurizing seal excavator of the present invention. 4 is a longitudinal sectional view, FIG. 4 is a view taken from the direction shown in FIG. 3, FIG. 5 is a partially omitted view taken from the direction shown in FIG. 3, and FIG. 6 is taken along the - line in FIG. 4. The sectional view, FIG. 7, is a schematic perspective view of the cutter head. 20 is the shield body, 22 is the cut head, 2
3 is a soil intake port, 25 is a support leg, 26 is a receiving member,
27 is a support part, 33 is a partition wall, 35 is a mud feeding pipe, 36
is the sludge drainage pipe, A is the intake chamber, B is the cut-off support structure, and C is the sealing member.

Claims (1)

[Claims] 1 Inside the shield body 20, the central space is separated by a partition wall 3
A cutter head support structure B having a ring-shaped support portion 27 closed by a cutter head 3 is provided, and a plurality of support legs 25 are provided protruding from the rear surface of the cutter head 22 having an earth and sand intake port 23. A ring-shaped receiving member 26 is provided at the end, and the ring-shaped receiving member 26 of the cutter head 22 is connected to the supporting portion 27 of the cutter head support structure B.
In this case, the cutter head 22 is attached to the shield body 2.
0, so as to form an intake chamber A extending over the entire inside of the shield body 20 between the cutter head 22 and the cutter head support structure B;
A mud water pressurizing type shield excavator characterized in that it is rotatably supported via a sealing member C, and a mud feed pipe 35 and a discharge pipe 36 are connected to the intake chamber A.