JPS6023598A - Tunnel drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a tunnel boring machine.

Figure 1 shows a conventional tunnel boring machine.

The tunnel excavating machine shown in this figure has a segment 1, a shield hull 2 equipped with a front end side π, and a partition wall 4 for taking in soil, which is partitioned by a partition wall 3 at the front end of the shield hull 2. , the bearing part 7 and the bearing box 6 attached to the partition wall 3
A rotary shaft 9 is supported by a bearing 8 provided in the rotary shaft 9 and is connected to a rotary drive source 10 via a gear train 11, and a plurality of blade portions 13 are attached to the front end of the rotary shaft 9. cutter wheel 12, swivel joint 14 and rotating shaft 9
A screw conveyor 18 and a belt conveyor 21 (! : , and a shield jack 65 provided around the shield hull 2.

Then, the cutter wheel 12 is rotated to excavate the face 58' with the blade part 13, and if the viscosity of the excavated soil is not suitable, a viscosity imparting material such as bentonite solution gin is injected from the viscosity imparting material injection means, and the cutter wheel The excavated soil and viscosity imparting material are kneaded through 12 spokes, etc., and the properties of the soil are converted into soil with fluidity and water-stopping properties. The chamber 4 is filled with this mixed earth and sand to prevent the face earth from collapsing and the spring water from spouting into the screw conveyor 18. In addition, mixed earth and sand consisting of excavated earth and sand and a viscosity imparting material is conveyed by a screw conveyor 18, transferred from an earth and sand outlet to a belt conveyor 21, and carried out by this conveyor 21 outside the mine.

The excavator is propelled by extending the shield jack 65 while taking reaction force from the rear segment 1.

The extension speed of the shield jack 65 is set according to the unloading capacity of the screw conveyor 18, and is always
A certain level of soil is built inside the tunnel, which prevents the rock face from collapsing.

The earth and sand in the chamber 4 is required to have fluidity and water-tightness. If the earth and sand in the container 4 do not have fluidity, the earth and sand will settle in the container 4 and will not flow to the screw conveyor 18.

In this case, increasing the thrust will cause more and more digging of Fi11 earth and sand.
The water is dehydrated and solidly settles in the chamber 4, making digging power impossible. On the other hand, in the case of earth and sand that does not have water-stop properties, spring water will flow through the screw conveyor 18 and gush out into the tunnel. Therefore, in this type of tunnel excavation machine, it is necessary to give the soil in the chamber 4 fluidity and water-tightness. It is important to convert the properties of muddy water into soil that has fluidity and water-stopping properties.

Further, the propulsion speed of the tunnel boring machine is determined by the speed at which the earth and sand in the chamber 4 are converted into earth and sand that has fluidity and water-stopping properties. If the propulsion speed is too fast and the properties of the excavated soil or muddy water in the chamber 4 cannot be changed in time, or if the excavated soil, muddy water, or viscosity imparting material is not mixed in time, the sediment will settle in the chamber 4. There is a risk that phenomena or spring water gushing phenomena will appear.

However, in the conventional tunnel excavating machine, even if the screw conveyor 18 as the earth and sand transport means has sufficient carrying capacity, the cutter wheel 12 has sufficient digging capacity, and the shield jack 65 has sufficient speed, it is difficult to change the properties of the excavated earth and sand or muddy water. The drawback is that it takes time, and therefore the propulsion speed must be slowed down.

In the tunnel boring machine shown in FIG. 1, the same members as those in the embodiments of the present invention described later are designated by the same reference numerals.

An object of the present invention is to provide a tunnel boring machine that can significantly shorten the time required to convert the properties of excavated soil and mud into soil that has fluidity and water-stopping properties.

The features of the present invention include an excavating means provided at the front end of the shield hull, a partition wall provided at a portion rearward of the excavating means within the seal noll, and a front end within the shield hull. In a tunnel excavating machine, the tunnel excavator is provided with a chamber for taking in dirt formed in the partition wall, and an earth and sand conveying means for conveying the earth and sand in this chamber rearward, and receiving mixed earth and sand from the earth and sand carrying means. An earth and sand pumping device is installed, and the outlet of this earth and sand pumping device is connected to a first pumping system that pumps cross-track earth and sand to the rear of the tunnel, and a second pumping system that returns it to the chamber. In addition, since the first pumping system and the second pumping system are configured to be selectively opened, the above object can be reliably achieved with this configuration.

Hereinafter, the present invention will be explained based on the drawings.

FIGS. 2 to 4 show an embodiment of the present invention, and FIGS. 5 to 7 show the operation of the earth and sand pumping device.

The tunnel excavators shown in FIGS. 2 to 4 are equipped with a seal nozzle 2 at the front end of a segment 1, and a partition wall 3 is attached to the front end of the seal nozzle 1, and a channel for taking in earth and sand is installed at the front end of the segment 1. (4 is the division.

It is formed.

As shown in FIG. 2, a gearbox 5 is attached to the rear end surface of the partition wall 3, and a bearing box 6 is attached to the rear end surface of the gearbox 5.

Further, a bearing portion 7 is provided at the center of the partition wall 3, a bearing 8 is provided in the bearing box 6, and a rotating shaft 9 is supported by the bearing portion 7 and the bearing 8.

The rotating shaft 9 is connected to a gear box 5, as shown in FIG.
It is connected to a rotational drive source 10 attached to the rear end surface via a gear train 11 as a transmission mechanism provided in a gearbox 5. Further, a cutter wheel 12 having a plurality of blades 13 as an excavating means is attached to the front end of the rotating shaft 9, and a swivel joint 14 for injecting the viscosity imparting material is attached to the rear end. ing. A viscosity imparting material such as a bentonite solution is supplied from the swivel joint 14, and the viscosity imparting material passes through an injection passage 15 provided inside the rotating shaft 9, and is passed through an injection passage 15 provided at the tip of the rotating shaft 9. It is injected into the excavated earth and sand or muddy water through the injection port 16.

The partition wall 3 is connected to the lower part of the chamber 4 and has an outlet 1 for discharging excavated soil, muddy water, and mixed soil mixed with a viscosity imparting material.
7 is formed.

Inside the segment 1 and the shield hull 2, a screw conveyor 18 serving as a means for transporting straw and earth and sand is installed in an inclined manner. A screw rotation drive source 19 is attached to the upper end of this screw conveyor 18, and the lower end, or inlet side end 18', is connected to the outlet 1 for the kneaded earth and sand.
7, and an earth and sand outlet is formed near the upper end.

Inside the segment 1, below the earth and sand outlet crane of the screw conveyor 18, as shown in FIG. 2, an earth and sand pumping device n is installed.

As shown in FIG. 3, the illustrated embodiment of the earth and sand pumping device 22 is equipped with an earth and sand storage tank 23, and excavated earth, muddy water, and viscosity imparting material are fed from the earth and sand outlet of the screw conveyor 18 to the earth and sand storage tank. It is designed to supply 58 wo of cross-current earth and sand.

An oil tank is installed on the rear side of the exterior of the earth and sand storage tank B, and this oil tank stores lubricating oil 57 for lubricating the sliding surfaces of the outer and inner cylinders 39 and 50, which will be described later. .

A sediment suction port 23a is set in the sediment storage tank, a pressure-feeding vibro is arranged on one end side of the sediment suction port 23&, and a sand-pressure pump blade is arranged on the other end side. The pressure-feeding vibro and the soil-feeding pump are arranged on the same axis.

As shown in FIG. 3, the pressure-feeding vibro is attached to the rear wall 23b of the earth and sand storage tank B via a mounting member A with a seal casing 27 in between. The seal casing n has a tip 3 of the outer cylinder 39.
A ring-shaped sealing member 9' in close contact with the ring-shaped sealing member 4 is fitted, and this sealing member row is attached to the fixed ring 4.

As shown in FIG. 3, the earth and sand pressure pump 33 includes a casing 35, an outer cylinder 39 as an isolation device between the pressure pipe and the earth and sand storage tank, a piston 40 for pushing the outer cylinder, and a piston 40 for pushing the outer cylinder. 49, an inner cylinder (material), a piston 51 for pumping earth and sand attached to one end of the inner cylinder 50, and an inner cylinder pusher attached to the other end of the inner cylinder 50. A piston 52, a stopper 56 for the piston 52, and a fluid pressure operating section for the outer and inner cylinders are provided.

In this earth and sand pressure pump 33, the moving direction in which the outer cylinder 39, the inner cylinder (component), and the members attached thereto approach the pressure pipe 5 is defined as the forward direction.

As shown in No. 3, the casing A is formed into a U-shaped cross section 9, and is located at the rear side of the oil tank 1i 24 a.
It is attached to via a mounting member 34.

The outer cylinder 39 is supported by a support member and is provided so as to be slidable in the axial direction on the casing. When the piston 40 for pushing the outer cylinder pushes forward in the forward direction, the kneaded soil 5B near the sand suction port 23a is taken into the outer cylinder 39 through its tip 39', and then the tip The portion 39' is in close contact with a row of seal members provided at the inlet end of the pressure pipe 5 via the seal casing 27, so as to isolate the pressure pipe 5 from the earth and sand storage tank.

A fluid pressure chamber 41 for advancing the piston 40 is formed between the piston 40 for pushing the outer cylinder and the inner surface of the rear wall of the casing, and a fluid pressure chamber 41 for retracting the piston 40 is formed between the piston 40 and the body of the casing. A fluid pressure chamber 42 is formed. The piston 40 also has fluid pressure passages 43 and 44 that communicate between a fluid pressure chamber 41 for advancing the piston 40 and a fluid pressure chamber 53 for advancing a piston 52 for pushing the inner cylinder, which will be described later. , 44, a guide pipe 47 that serves as a guide and fluid pressure passage for the piston 52 for pushing the inner cylinder, and a piston 40 for pushing the outer cylinder.
A fluid pressure passage 48 is provided that connects the fluid pressure chamber 42 for retracting the guide pipe 47 and the inlet side end of the guide pipe 47. Although the fluid pressure passage 43 is provided with a restriction 946 as a differential pressure generating means for reliably operating the spool 45, the restriction 946 may be provided in the fluid pressure passage 44. The fluid pressure passages 43 and 44 and the spool 45 are shown enlarged in FIG. 4.

Stop collar 49 of the piston 40 for pushing the outer cylinder
is attached to the front end of the casing.

The inner cylinder is provided so as to be slidable in the axial direction inside the outer cylinder 39.

When the inner cylinder (material) is pushed in the forward direction by the piston 52 for pushing the inner cylinder, the piston 51 for pumping the earth and sand removes the mixed earth and sand 58 containing salt 9 in the outer cylinder 39. is designed to be pumped.

Inside the outer cylinder 39, a piston 40 for pushing the outer cylinder and a piston 5 for pushing the inner cylinder are provided.
A fluid pressure chamber 53 for advancing a piston 52 for pushing the inner cylinder is formed between the two, and a piston 52 for pushing the inner cylinder is formed between the inner circumference of the outer cylinder 39 and the outer circumference of the inner cylinder. A fluid pressure chamber 54 is formed for retracting the. Further, the inner cylinder is provided with a fluid pressure hole 55 that connects the inner chamber ′ with a fluid pressure chamber 54 for retracting the piston 52 for pushing the inner cylinder.

Stopper 56 of the piston 52 for pushing the inner cylinder
is provided approximately in the middle of the outer cylinder 39.

Fluid pressure controls for the outer and inner cylinders are connected to a fluid pressure source (not shown) supplying fluid pressure to said boat 36,37.
and a switching means (not shown) for alternately switching the bows 36 and 37 to the fluid pressure supply or discharge side. This fluid pressure operating section is connected to the outer cylinder 3.
9 is advanced, and its tip 39' scoops up the mixed soil 58 to be pumped and takes it into the outer cylinder 39, and then the tip 39' After applying pressure to the sealing member 4 to isolate the pressure-feeding vibrator 5 and the earth and sand storage tank, the inner cylinder 50 is moved forward, and the piston 51 for earth and sand pressure-feeding is moved through the inner cylinder.
is moved forward to force-feed the mixed earth and sand 58 into the force-feeding vibrator b, then the outer cylinder 39 is moved back, the inner cylinder (supply) is then moved back, and the piston 51 for earth and sand pressure feeding is moved back. cylinder 39
, 50.

A pumping nozzle as an outlet of the earth and sand pumping device n.

5, as shown in FIG.
8 to the chamber 4 and a second pumping system 60 is connected thereto. The first pumping system 59 supplies the pulp 6
1 and a pressure feeding tube 63 connected to the pressure feeding vibe 5 via the pulp 61.

On the other hand, the second pumping system ω includes a noclup 62 and a pumping vibro 4 that is branched from the pumping vibro and communicated from the top of the partition wall 3 into the chamber 4 . The pulps 61 and 62 open the pulp 61 and close the pulp 62 when the mixed earth and sand 58 is forced to the rear of the tunnel, and when the mixed earth and sand 58 is placed in the chamber 4 for ashes, the pulp 62 is opened. It is assumed that the pulp 61 is opened and the pulp 61 is closed.

As shown in FIG. 2, around the shield hull 20,
A shield jack 65 is provided, and the rear segment 1
Shield jack 65' while taking reaction force to 9! il-
It is designed to extend and provide thrust to the excavator.

The tunnel boring machine of the above embodiment is operated as follows,
act.

That is, in the state shown in FIG. 2, the rotational drive source 10 of the cutter wheel 12 and the rotational drive source 19 of the screw conveyor 18 are driven.

The cutter wheel 12 is driven by the rotational drive source 10 of the cutter wheel 12 via the gear train 11 and the rotating shaft 9.
rotates, and the cutting face 58' is excavated by the blade portion 13 provided on the cutter wheel 12.

On the other hand, a viscosity imparting material such as a bentonite solution is injected into the excavated earth and sand or muddy water from a swivel joint 14 for injecting the viscosity imparting material through an injection passage 15 and an injection port 16 provided on the rotating shaft 9.

The excavated soil, muddy water, and viscosity imparting material are stirred by the spokes of the cutter wheel 12 and filled into the chamber 4, and then enter the screw conveyor 18 through the outlet 17 provided in the partition wall 3. The earth and sand outlet of the screw conveyor 18 is supplied to the earth and sand pumping device n.

The earth and sand pumping device n receives the mixed earth and sand 58 into the earth and sand storage tank n, and then, as shown in FIGS. The piston 51 for pumping earth and sand is moved forward, and the tip 39' of the outer cylinder 39 transfers the kneaded earth and sand 58 near the earth and sand suction port 23a to the outer cylinder 39.
After the distal end 39' of the outer cylinder 39 comes into pressure contact with the sealing member path provided at the inlet end of the pressure pipe 5 and isolates the pressure pipe 5 from the sediment storage tank n, the sixth As shown in the figure, the piston 51 for pumping earth and sand is advanced through the piston 52 for pushing the inner cylinder and the piston 51 for pumping earth and sand, and the mixed earth and sand taken into the outer cylinder 39 is transferred to the pipe 5 for pumping the mixed earth and sand. Push it in and force feed it. After the cross-contact earth and sand are pumped, the outer cylinder 39 is moved back, and then the earth and sand pumping piston 51 is moved back.

In this top sand pumping device n, the kneaded earth and sand 58 in the sand storage tank n can be pumped one after another by repeatedly performing the above-described sequential operations.

In the initial stage of excavation, if the excavated soil or muddy water and the viscosity imparting material are not well mixed, and the excavated soil or muddy water is not converted into something with the necessary fluidity and water-stopping properties. This is earth and sand pumping device 1! The first one connected to the outlet of L22. Of the second pumping systems 59 and 60, the pulp 61 of the first pumping system 59 is closed, and the pulp 61 of the second pumping system ω is closed.
2 is opened, and the cross-track earth and sand carried out by the screw conveyor 18 falls from the earth and sand outlet of the screw conveyor 18 and is supplied to the earth and sand storage tank of the earth and sand pumping device [22]. Then, the kneaded soil 58 in the earth and sand storage tank is pumped to the pumping pipe section by the sand pump 33, and returned to the chamber 4 from the pumping pipe 5 through the pumping vibro 4 of the second pumping system 60.

Meanwhile, the mixed soil that has not been converted into soil with the necessary fluidity and water-stopping properties is mixed while passing through the above-mentioned path, and is mixed with other excavated soil, muddy water, and viscosity imparting material in the chamber 4. Since the excavated soil and mud are kneaded again, the properties of the excavated soil and mud can be changed into ones with necessary and sufficient fluidity and water-stopping properties in a short time.

1. After converting excavated soil and mud into properties with sufficient fluidity and water-stopping properties. The first one connected to the outlet of the earth and sand pumping device B. Of the second pumping systems 59 and 60, the pulp 61 of the first pumping system 59 is opened, and the pulp 61 of the second pumping system 60 is opened.
Close 2.

As a result, the mixed earth and sand taken out from the outlet 17 provided in the partition wall 3 and carried out by the screw conveyor 18 is supplied from the earth and sand outlet of the screw conveyor 18 to the earth and sand storage tank B of the earth and sand pumping device n. The soil is then pumped by the earth and sand pump 33 to the pumping vibrator 5, and sent to the rear of the tunnel via the pumping vibro 3 of the first pumping system 59 connected thereto.

When propelling the excavator, move the shield jack to the rear.
This is done by applying a reaction force to segment 1 and elongating it.

In addition, when the excavator is stopped, when the tsuma υ segment 1 is being assembled, when the huyum pipe is being installed in the case of the Oshipipe construction method, or in the case of Shigin when other preparations are being made, the first The pulp 61 of the pumping system 59 is closed, the pulp 62 of the second pumping system 60 is opened, and the mixed earth and sand in the chamber 4 are removed from the chamber 17.
→ Screw conveyor 18 → Earth and sand outlet addition → Earth and sand storage tank n of earth and sand pumping device n → Same pressure sending pipe 5 → Pressing vibro 4 of second pumping system 60 → Chamber 4.

As a result, the mixed track soil has been mixed in a good condition, so when the propulsion restarts, the newly excavated soil and mud are
Since it can be incorporated into the circulated mixed soil and immediately converted into something with the necessary fluidity and water-stopping properties, it is possible to quickly return to normal propulsion speed and proceed with excavation.

If the excavated soil has appropriate fluidity and waterproof properties, it is sufficient to simply stir it with the spokes of the cutter wheel 12 without injecting the viscosity imparting material.

In the present invention, the means for transporting the earth and sand mixed in the chamber 4 is not limited to the illustrated screw conveyor, and the earth and sand pumping device that receives and pressurizes the mixed earth and sand from the earth and sand transport means is not limited to the one in the illustrated embodiment. . Furthermore, the first pumping system that receives the mixed earth and sand from the sand pumping device and pumps it to the rear of the tunnel, and the second pumping system that sends the mixed earth and sand into the ashes into the chamber are not limited to the illustrated embodiment. The switching may be performed by remote control.

According to the present invention as described above, an earth and sand pumping device is installed which receives and pressurizes the mixed earth and sand from the earth and sand transport means which transports the mixed earth and sand from the chamber, and at the outlet of this earth and sand pumping device is installed which pumps the mixed earth and sand to the rear of the tunnel. The first pumping system is connected to a second pumping system for transporting the ashes into the chamber, and the mixed earth and sand are returned to the chamber through the second pumping system during the initial stage of tunnel excavation or during the suspension of propulsion. As a result, excavated soil, muddy water, and viscosity-imparting materials that are not well-mixed at the initial stage of excavation are mixed up while passing through the above-mentioned path and returned to the chamber. Not only does it have the effect of converting it into something with excellent fluidity and water-stopping properties, but when propulsion is resumed, newly excavated soil and muddy water can be added to the well-mixed mixed soil to provide the necessary fluidity immediately. It has the effect of converting it into mixed soil that has good water resistance and water-stopping properties, and it also has the effect of improving excavation efficiency.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view of a conventional tunnel excavating machine, Fig. 2 is a longitudinal side view showing an embodiment of the present invention, and Fig. 3 is an outer and inner cylinder of an earth and sand pump constituting an earth and sand pumping device. An enlarged view showing details of the fluid pressure passage and spool that actuate the pushing piston, and FIGS. 4, 5, and 6 are explanatory diagrams of the sequential operations of the members constituting the earth and sand pump, respectively. It is. 1... Segment, 2... Shield hull 0.3...
- Partition wall, 4... Chamber, 12... Cutter wheel, 13... Blade portion, 14... Swivel joint constituting the viscosity imparting material injection means, 15... Injection passageway, 16 . . . Inlet, 18. Screw conveyor as means for transporting the mixed soil, n.. Earth and sand pumping device, 5. Earth and sand storage tank, 6. Pipe,... Sediment pump, 3
9... Outer cylinder as an isolation device between the pressure pipe and the earth and sand storage tank, (capital)... Inner cylinder, 51.
...Piston for pumping earth and sand, 5B...Mixed earth and sand of excavated earth and mud and viscosity imparting material, 59...No. 1 for pumping mixed earth and sand from the outlet of the earth and sand pumping device to the rear of the tunnel.
A pressure feeding system, ω... A second pressure feeding system for causing the mixed earth and sand to enter the chamber from the outlet of the earth and sand pumping device, 65... A shield jack. Patent Applicant Hitachi Construction Machinery Co., Ltd. Agent Patent Attorney Tadashi Akimoto 51 Figure 4 35 Figure 5 Procedural Amendment (formality) 1980 1018 Commissioner of the Japan Patent Office Kazuo Wakasugi Tono 1, Indication of the case Showa sg Application No. 13023λ 2, Title of the invention Tunneling machine 3, Relationship with the amended case Patent tui no ＼ Address (residence) No. λ, 2-6 Otemachi, Chiyoda-ku, Tokyo Name (552) Hitachi Construction Machinery Co., Ltd. 4, in the agent's statement, page J line to page 1/page line λ, "Fig. μ, No.!
FIG. 6 and FIG. 6 are explanatory diagrams of the sequential operations of the members constituting the earth and sand pump, respectively. ' to 'Hongzu, No. 5
6 and 7 are explanatory diagrams of the sequential operations of the members constituting the earth and sand pump, respectively. ” he corrected. that's all

Claims (1)

[Claims] an excavation means provided at the front end of the shield hull; a partition provided within the shield at a rear portion of the excavation means; and a partition provided at the front end of the shield hull by the partition;
An earth and sand pumping device that receives and pressurizes mixed earth and sand from the earth and sand transport means in a tunnel excavator comprising a formed chamber for taking in earth and sand, and earth and sand conveying means for conveying the earth and sand in the chamber backward. A first pumping system for pumping mixed soil to the rear of the tunnel, and a second pumping system for returning sand to the chamber are installed at the outlet of the upper sand pumping device.
1. A tunnel excavating machine, characterized in that the first pumping system and the second pumping system are connected to each other and are configured to selectively open the first pumping system and the second pumping system.