TWI535930B - Earth and sand discharging apparatus of earth pressure balanced shield machine - Google Patents

Description

Earth pressure shield drive sand and gravel discharge device

The invention relates to a gravel discharge device for a soil pressure shield propeller, and the sandstone discharge device of the earth pressure shield propeller is premised on the use of a belt type shaftless screw machine capable of transporting boulders, thereby ensuring the confrontation Excavating the earth pressure of the earth pressure, and even if it is a ground with more gravel, it can be carried out without being inferior to the ordinary gravel layer.

Roughly speaking, the earth pressure shield method promotes the shield propulsion machine by the shield jack, and simultaneously excavates the excavation surface of the site by the rotary cutter in front of the shield propeller. The excavated sandstone is filled in a cutter chamber behind the rotary cutter and a screw machine for discharging soil from the cutter chamber.

At this time, the additive material is injected into the front surface of the rotary cutter or the cutter chamber. The added material is mixed in the excavation of the sand, and the sand is converted into a soil rich in plastic flow (freely deformable and movable) and exerting water impermeability.

The soil system is filled in the chamber of the cutter from the screw machine, and the earth pressure against the excavation surface and the groundwater pressure are generated in the soil by the propulsion force of the shield jack (hereinafter, referred to as "excavation surface soil" Pressure").

In order to maintain the balance between the earth pressure and the earth pressure of the excavation surface, the balance between the propulsion of the shield propulsion machine and the discharge amount of the screw machine is achieved, thereby continuously advancing while maintaining the stability of the excavation surface.

By adding additive materials to the excavated sand and gravel, the soil with plasticity and water impermeability is prepared, and the smooth discharge of the screw machine is ensured, and a piston zone (anti-seepage zone) is formed in the screw machine to prevent groundwater. Eruption.

Such a sand discharge device of the earth pressure shield is disclosed in, for example, Patent Document 1. The "earth pressure bubble shield propulsion device" of Patent Document 1 has a bubble generator including a cutting disk disposed at a head portion of a front portion of the shield body, a partition wall disposed behind the cutting disk, and a pair formed thereon a screw machine having a front end opening is inserted through the partition wall between the cutting disc and the partition wall, and the partition wall is inserted through the partition wall to protrude into the earth pressure chamber for injecting air bubbles; a delivery pipe that fluidly connects the earth drain opening provided at a rear portion of the screw machine to a hopper disposed outside the tunnel; and a pressure feed pump disposed in the vicinity of the earth drain port Upper, and the excavated sand with bubbles is continuously pumped to the hopper. Patent Document 1 uses a shaft screw machine having a rotating shaft in the center to discharge the sand.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 1-37560

Moreover, when the site is spread with more boulders, for example, boulders having a size exceeding Φ 500, and in addition to the geological conditions such as pebbles or gravel, especially such boulders, due to the generally common axis with the central axis of rotation The inner diameter of the shaft-mounted screw machine for the submersible propeller is similar and cannot be transported, and it is not efficient and unrealistic to carry out the pulverization of the boulders.

Belt-type screwless machines can be considered for the transfer of boulders. The belt type shaftless screw machine is attached to the inner peripheral surface of the inner cylinder that is rotationally driven, and is provided with spiral blades continuously along the longitudinal direction of the inner cylinder. Thereby, even if the center rotation axis is removed and it is smaller than the inner diameter of the inner cylinder which is a conveyance path, even if it is a gravel, it can carry out.

However, the belt type shaftless screw machine is different from the shaft screw machine, and it is impossible to transport the sand and gravel in a compact state. In particular, the excavation sand containing the boulders is unsteadyly rolling around due to the boulders retreating from the excavation of the sand, so the pressure in the transport path is extremely unstable.

When it is impossible to convey the excavated sand in a dense state as described above and the pressure in the transport path is unstable, even if the number of revolutions of the screw machine is controlled, it is difficult to appropriately ensure that the self-cutter chamber is spread over the screw machine. The earth pressure, therefore, it is difficult to maintain the balance with the earth pressure of the excavation surface, so that the earth pressure shield shield method cannot be safely constructed.

That is, the belt type shaftless screw machine cannot properly secure the piston area which is the anti-seepage area against the earth pressure of the excavation surface. In particular, when the groundwater pressure is high, there is a problem in the construction of the belt type shaftless screw machine.

The present invention has been developed in view of the above-mentioned problems, and an object of the present invention is to provide a gravel discharge device for a soil pressure shield propulsion machine, which uses a belt capable of transporting boulders. The premise of the shaftless screw machine is to ensure the earth pressure against the earth pressure of the excavation surface, and even for the site where more gravel is scattered, the propulsion operation can be carried out without being inferior to the ordinary gravel layer.

The gravel discharge device of the earth pressure shield propulsion machine of the present invention comprises a digging gravel portion including a gravel portion which is excavated by a rotary cutter and is filled with a gravel portion inside the cutter chamber behind the rotary cutter. The utility model is characterized in that: the belt type shaftless screw machine is connected to the cutter chamber, and the maximum transportable gravel diameter is the transport path, against the excavation surface earth pressure, which is discharged from the cutter chamber to the outside. Above the radius, the excavation sand containing the gravel portion is transferred from the cutter chamber; and the earth drain pipe is connected to the screw machine and has a carry-out path having a diameter smaller than a diameter of the transport path of the screw machine. It is set to be longer than the length of the piston zone due to the pressure loss of the dredged sand.

In the sand discharge device of the earth pressure shield propulsion machine of the present invention, an air supply pipe for supplying air to the carry-out path is connected to the earth drain pipe to adjust the fluidity of the dredged sand.

In the sand discharge device of the earth pressure shield propulsion machine of the present invention, a water supply pipe for supplying water to the carry-out path is connected to the earth drain pipe to adjust the fluidity of the excavation sand.

The gravel discharge device of the earth pressure shield propulsion machine of the present invention is premised on the use of a belt type shaftless screw machine capable of transporting boulders, and can ensure the earth pressure against the earth pressure of the excavation surface, and even if more gravel is scattered. The site can also be used for propulsion work, which is not inferior to the usual gravel layer.

Hereinafter, a preferred embodiment of the sand and gravel discharge device of the earth pressure shield propulsion machine of the present invention will be described in detail with reference to the accompanying drawings. 1 is a schematic side cross-sectional view showing a gravel discharge device 30 of the earth pressure shield propulsion machine 1 for the earth pressure shield method according to the present embodiment, and FIG. 2 shows the earth pressure shield propeller 1 Rotate the front view of the cutter 2.

The earth pressure shield propulsion machine 1 is mainly composed of a surface plate 3 which is hollow cylindrical body shape; a partition wall 4 which is disposed on the front end side of the surface plate 3; and a rotary cutter 2 which is separated from the partition wall 4 The opening interval is provided at the front side, and is rotationally driven by a rotational driving means (not shown) to excavate the excavation face Z of the ground plate; the cutter chamber 5 is formed between the rotary cutter 2 and the partition wall 4, Loading the excavated sand and gravel; stirring device (not shown), which is disposed in the cutter chamber 5, mixing and stirring the loaded sand and the injected medicament; the shield jack 7 is compared with the partition wall 4 The rear side is disposed in the surface plate 3 to generate a reaction force for obtaining a reaction force by the ring piece 6 to advance the rotary cutter 2 together with the surface plate 3; and a belt type shaftless screw machine 8 penetrating the partition wall 4 The loading end portion 8a is placed in the cutter chamber 5, and the discharge end portion 8b is extended obliquely upward toward the rear of the surface plate 3, thereby discharging the sand from the inside of the cutter chamber 5. Moreover, the cab 10 of the shield propulsion machine 1 is provided in the subsequent carriage 9 behind the shield propulsion machine 1, and the driver performs the driving control of the shield propulsion machine 1 from the cab 10.

The earth pressure shield propulsion machine 1 of the present embodiment is particularly preferably applied to an excavation surface of a ground plate composed of a gravel or pebble layer which may be mixed with the pebbles of the boulders which are not suitable for loading into the cutter chamber 5. Z is the case of mining. Of course, it can also be applied to gravel or pebble layers, usually gravel layers, etc., which do not contain such boulders.

The rotary cutter 2 is constituted by a spoke type as shown in FIG. The rotary cutter 2 is composed of a hub portion 12 located at the center of the rotary cutter 2 and mounted with a center drill 11; 6 spoke portions 16 that are oriented from the hub portion 12 toward the periphery of the rotary cutter 2 Radially extending, and various drill bits 13, 14 or roller cutters 15 are mounted; an intermediate ring 17 is coupled between the intermediate portions of the spoke portions 16; and an outer peripheral ring 18 is coupled between the front ends of the spoke portions 16.

In the intermediate ring 17, in order to control such that the large-sized boulder X or pebbles or the like are located substantially in the middle of the spoke portion 16 and the spoke portion 16, and are loaded from the spoke portion 16 into the cutter chamber 5, The protrusion 19 is restricted. In other words, in the rotary cutter 2, the hub portion 12 is defined by the intermediate ring 17 having the spoke portion 16 and the restricting projection 19, and the outer peripheral ring 18, thereby forming the bobbin loading restriction region R.

The earth pressure shield method of the present embodiment adds the medicament to the sand and stone excavated by the rotary cutter 2, and converts the excavated sandstone into a plastic fluidity and impermeability by stirring and mixing by using a stirring device. Sexual soil. Further, the soil is filled in the cutter chamber 5 and the screw machine 8, and is filled in the earth drain pipe 25 which is filled in the cutter chamber 5 by the propulsive force of the shield jack 7 and the like. The soil is pressurized to generate earth pressure, and the earth pressure is applied against the earth pressure of the excavation surface to stabilize the excavation surface Z.

When the earth pressure shield propulsion machine 1 is propelled, in order to maintain the stability of the excavation surface Z, the propulsion is performed in the following manner: for example, the rotation speed of the rotary cutter 2 is made constant, and the extension speed or snail of the shield jack 7 is adjusted. The rotational speed of the transport unit 8 is measured by the earth pressure gauge (not shown) provided on the partition wall 4, and the earth pressure generated in the cutter chamber 5 from the earth drain pipe 25 via the screw machine 8 is measured. The measured earth pressure is maintained at a constant pressure.

The earth pressure shield propulsion machine 1 of the present embodiment is provided with a soil adjustment means for excavating the surface Z of a site in which fine sand or coarse sand, gravel, and pebbles and gravel X are interspersed. At the time of advancement, the state of the soil in the cutter chamber 5 is rationalized.

The soil adjusting means includes a first injection means 20 which is provided at an appropriate position of the spoke portion 16 or the hub portion 12 of the rotary cutter 2, and injects a medicine into the excavation surface Z in front of the rotary cutter 2; the second injection means 21 And disposed in the vicinity of the central portion of the partition wall 4 to inject the medicine into the cutter chamber 5; and the third injection means 22 is disposed at an appropriate position of the peripheral portion of the partition wall 4 to the periphery of the surface plate 3 or cut The medicament is injected into the chamber 5.

The first and third injection means 20 and 22 are filled with a bentonite-based additive or the like as a clay material. The second injection means 21 injects a bubble material. The specific configurations of the injection means 20, 22 for injecting the mud material and the injection means 21 for injecting the bubble material are known in the prior art.

Further, in the present embodiment, the injection means 20, 22 for injecting the mud material and the injection means 21 for injecting the bubble material are separately disclosed, but the mud material and the bubble material may be used as the injection port (not In the vicinity of the mixing, or by the time of injection of the mud material and the injection time of the bubble material, the injection means 20, 22 and the injection means 21 for the bubble material are used together. That is, the clay material and the bubble material can be injected from all of the injection means 20 to 22.

The sandstone system including the gravel portion of the excavation face Z which has just been excavated by the rotary cutter 2 is rotated by the rotary cutter 2 and the first injection means 20 from the rotary cutter 2 to the excavation face Z. The injected mud or bubble material is stirred and mixed, and loaded into the cutter chamber 5 while being loaded. Further, the sand containing the gravel portion excavated from the excavation surface Z by the rotary cutter 2 and loaded into the cutter chamber 5 is attached to the cutter chamber 5, and the second from the partition wall 4 The third injection means 21, 22 are injected into the cutter chamber 5 as a mud or bubble material, and are stirred and mixed.

That is, the gravel portion including the gravel portion excavated by the rotary cutter 2 is attached to the screw machine 8, at the position of the excavation face Z and the cutter chamber 5, and the mud material and the bubble material. Mix and mix.

Further, in the earth pressure shield propulsion machine 1 of the present embodiment, a clogging monitoring means is provided in order to monitor the clogging of the sand from the inside of the cutter chamber 5 to the inside of the screw machine 8. The tendency of clogging of sand and gravel is caused by the frictional heat of the sand that is retained by stirring or the like, and is estimated by the increase in the temperature of the sand.

The clogging monitoring means is constituted by a temperature sensor 23 which is disposed inside the screw machine 8, and measures the temperature (dumping temperature) of the sand containing the gravel portion conveyed by the screw machine 8; and the control panel 24 It is disposed in the cab 10, and the draining temperature measured by the temperature sensor 23 is input, and the draining temperature is displayed for the driver to recognize.

The earthing temperature measured by the temperature sensor 23 is compared with the set temperature for clogging estimation, and is input to the control panel 24 as information for preventing the clogging before the feed control. When it is judged that the temperature of the earthing temperature approaches the set temperature, the dose of the medicine injected from the injection means 20-22 can be increased by the manual control of the driver or the automatic control of the control panel 24.

The sand discharge device 30 of the earth pressure shield propulsion machine 1 of the present embodiment is constituted by the belt type shaftless screw machine 8 and the earth drain pipe 25 connected to the screw machine 8.

The belt-type screwless machine 8 is a conventionally known one, and as shown in FIG. 3, for example, a spiral blade 33 is continuously provided along the longitudinal direction of the inner circumferential surface of the inner cylinder 32 as the conveying path 31. The inner cylinder 32 is rotatably supported inside the fixed outer cylinder 34, and a ring gear is provided at the longitudinal end of the inner cylinder 32, and the ring gear is meshed with the pinion gear provided to the drive motor, and by using a drive motor The inner cylinder 32 is rotated, and the excavating sand is conveyed from the loading end portion 8a in the cutter chamber 5 to the discharge end portion 8b by the spiral blade 33.

The inner cylinder 32 of the conveying path 31 of the screw machine 8 is different from the shaft screwing machine which is liable to cause clogging due to gravel or the like, and the maximum transportable gravel diameter M is at least the radius (D2/2) of the conveying path 31 or more. (Refer to Fig. 4), it is possible to transport large-size gravel that cannot be transported by the shaft-mounted screw machine.

The size of such gravel is defined by the bobbin loading restriction area R of the rotary cutter 2. The inner diameter of the conveying path 31 of the screw machine 8 is set in relation to the size of the bobbin loading restriction area R so that the bobbin loaded in the cutter chamber 5 can be conveyed by the screw machine 8. Alternatively, the size of the bobbin loading restriction region R is set by the relationship with the inner diameter of the transport path 31.

As shown in FIG. 4 and FIG. 5, a drain pipe 25 is connected to the discharge end portion 8b of the screw machine 8, and the earth drain pipe 25 is extended to the earthmoving and unloading carriage 26 assembled to the subsequent carriage 9, and is driven from the snail. The soil discharged from the transporter 8 is discharged to the soil and moved out of the trolley 26. The inside of the earth drain pipe 25 serves as a carry-out path 35 for excavating sand.

At a joint portion between the discharge end portion 8a of the screw machine 8 and the earth drain pipe 25, sandstone formed by an inner diameter larger than the diameter of the transport path 35 of the earth drain pipe 25 or the transport path 31 of the screw machine 8 is formed. In the stagnant portion 38, the gravel retention portion 38 can temporarily move the excavation sand while generating the earth pressure while the excavation sand sent from the screw conveyor 8 to the earth discharge pipe 25 is temporarily retained.

As shown in FIG. 4, the diameter D1 of the carry-out path 35, that is, the inner diameter of the earth-moving pipe 25, can accommodate the boulders discharged from the screw machine 8 and carry them out, and is set to be smaller than the diameter D2 of the transport path 31 (D1 < D2). To produce the following pressure loss. The excavating sandstone accommodated in the earth-moving pipe 25 flows in the earth-moving pipe 25 by the squeezing action of the dredging sand of the screwer 8, and is sent to the earthmoving-out trolley 26.

The length of the earthing pipe 25 from the screwing machine 8 to the soil removing truck 26 is set to form a piston zone in the earthing pipe 25 due to the pressure loss of the excavating sand conveyed while flowing in the conveying path 35 (impregnation prevention) The length of the area is above. The pressure loss is calculated in a manner balanced with, for example, the assumed maximum excavation surface earth pressure, and the length of the earth drain pipe 25 is set to ensure the length of such pressure loss. Further, the pressure loss can be changed by adjusting the plastic flow property of the excavated sand and the like.

The pressure loss can be calculated using the previously known "pressure loss formula for fluid flow in a tube." Of course, the larger the inner diameter of the earth-moving pipe 25 is, the smaller the pressure loss is. The smaller the inner diameter of the earth-moving pipe 25 is, the higher the pressure loss is. Therefore, the earth-moving pipe 25 is set in length by the relationship with the inner diameter thereof.

The pressure loss when the excavation sand moves in the carry-out path 35 inside the earth drain pipe 25 contributes to the earth pressure generated inside the earth drain pipe 25, and the earth pressure is used to form the piston region as the seepage prevention region. Prevent the emission of sand and the like due to groundwater pressure.

The sand and gravel discharge device 30 of the earth pressure shield propulsion machine of the present embodiment is a belt type screwless machine 8 that can be smoothly transported even if the boulders are smoothly transported, and the combination can accommodate the boulders and is set to generate pressure for forming the piston region. The earth drain pipe 25 of the length of the loss is produced, whereby the earth pressure against the earth pressure of the excavation surface is ensured, and the excavation sand containing the boulders is smoothly discharged.

An air supply pipe 36 that supplies air to the conveyance path 35 is connected to the earth discharge pipe 25 to adjust the fluidity of the dredged sand that moves inside. Further, a water supply pipe 37 for supplying water to the transport path 35 is connected to the earth drain pipe 25 to adjust the fluidity of the dredged sand that moves inside. The water or air changes the plastic flow of the excavated sandstone together with the mud material, thereby adjusting the pressure loss generated inside the earth drain pipe 25, thereby adjusting the earth pressure of the earth pressure relative to the excavation face.

In particular, when the earth pressure is higher than the earth pressure of the excavation surface, specifically, in the case where the length of the earthing pipe 25 that causes the pressure loss is too long, air or water can be mixed into the earth drain pipe 25. The sand is excavated and adjusted to apparently set the length of the earth-moving pipe 25 to a short state.

In the illustrated example, the air supply pipe 36 and the water supply pipe 37 are disposed at the end portion of the dumping machine 25 on the side of the screw machine 8, so that the excavating sand in the earth discharging pipe 25 can be appropriately adjusted in advance at the upstream position of the earth discharging pipe 25. The fluidity of the stone. However, the air supply pipe 36 and the water supply pipe 37 can appropriately set the connection portion and the number of installations.

Next, the earth pressure shield propulsion machine 1 of the above embodiment will be exemplified, and the action of the sand stone discharge device will be described. Specifically, the gravel discharge device of the earth pressure shield propulsion machine of the present invention will have the particle size accumulation curve shown in FIG. 6 (the fine particles (sand portion) having a particle diameter of less than 2 mm do not exceed 20% and the particle diameter It was developed as a target for gravel (gravel part) of more than 2 mm (more than 80%) and has been used in tunnel excavation in the suburbs of Tainan Bay in Taiwan under confidential conditions.

The earth pressure shield method basically relates to the self-cutter chamber 5 filled with the mud added to the screw machine 8 to ensure plastic flow or water impermeability, while the propulsion force of the shield jack 7 is used. The earth pressure against the earth pressure of the excavation surface is generated, and the earth pressure is used to maintain the stability of the excavation surface Z, and the rotation speed and the potential of the screw machine 8 for discharging the soil from the cutter chamber 5 are appropriately adjusted. The speed of the shield jack 7 is continuously advanced.

In the case of the earth pressure shield propulsion machine 1 , the earth pressure shield method of the present embodiment uses a bentonite additive or the like as a mud material and a bubble material as a medicine, and injects the medicines from the first to the third. The means 20 to 22 are injected into the excavation face Z in front of the rotary cutter 2, and then injected into the cutter chamber 5.

The earth pressure shield method of the present embodiment is intended to excavate an excavation surface Z of a site composed of a gravel or a pebble layer which may be mixed with the pebbles of the boulders which are not suitable for loading into the cutter chamber 5 The clay material represented by the bentonite-based additive material is generally not only useful for improving the plastic flow or impermeability of the sandstone, but also for the inclusion of the crushed boulders X in terms of the general understanding of the addition of the fine-grained portion. The excavated sandstone of the gravel portion such as gravel or pebbles may be wrapped together with the excavated sandstone to inhibit the separation of the gravel portion from the gravel, thereby improving the physical properties of the gravel and gravel portions. Thereby, it is possible to suppress the difficulty of the bubble material, that is, to prevent the separation of the adhesion between the particles of the sand and the like.

Further, the bubble material is used in combination with the above-mentioned clay material, and the plasticity or water impermeability which is generally understood is utilized, and the multiplication effect with the clay material as the fine particle portion is exerted to exert the bearing effect. The plasticity or water impermeability inhibits the adhesion of the gravel containing the gravel portion to the rotary cutter 2 or the partition wall 4, and enhances the excavation of the gravel by buffering the bubble material which is not obtained by the mud material. The compressibility of the mud material prevents the gravel portion from rolling in the cutter chamber 5 or the screw machine 8, and even if a rolling movement occurs, the abrupt change of the earth pressure can be suppressed by the buffering action.

Therefore, the earth pressure can be stabilized by using the mud material and the bubble material as a chemical, so that the excavation surface Z can be kept stable, and the gravel portion of the screw machine 8 can be smoothly discharged to prevent clogging. It also prevents the ejection.

In this manner, the excavation sand containing the gravel portion mixed with the mud material and the bubble material and stirred is loaded from the cutter chamber 5 to the screw machine 8, and further discharged to the soil removal carriage 26 via the earth drain pipe 25. The belt type screwless machine 8 is loaded with the excavated sand in the cutter chamber 5 from the loading end portion 8a by the spiral blade 33 of the inner cylinder 32, and is conveyed to the discharge end portion 8b.

The belt type shaftless screw machine 8 is different from the shaft screw machine in that the maximum transportable gravel diameter M can be set to a radius (D2/2) or more of the transport path 31, and even if the gravel is excavated with gravel, It can be loaded from the cutter chamber 5 and smoothly conveyed. The digging sand reaching the discharge end portion 8b of the screwing machine 8 is sent to the earth discharging pipe 25 by the pushing action from the screwing machine 8, and the earth discharging pipe 25 pushes the sand and gravel to the earth by the pressing action.碴 Move out the trolley 26 and move out. In the excavation sand which is carried out by the earth-moving pipe 25, air or water is appropriately mixed from the air supply pipe 36 and the water supply pipe 37, thereby adjusting the fluidity.

The earth-moving pipe 25 is set to have a length equal to or longer than the length of the piston zone by the pressure loss of the excavated sand to be carried out, thereby generating an anti-excavation face in the cutter chamber 5 from the earth-moving pipe 25 via the screw machine 8. Earth pressure of earth pressure. Thereby, the balance between the earth pressure and the earth pressure of the excavation surface is maintained and the groundwater is prevented from being ejected, and the amount of advancement of the shield propeller 1 and the amount of soil discharged by the gravel discharge device 30 are balanced, thereby maintaining the stability of the excavation surface. Continue to advance.

In the driving operation of the earth pressure shield propeller 1 , the earth pressure value detected by the earth pressure gauge is compared with the set soil pressure value, and when the earth pressure value is large, the rotation speed of the screw machine 8 is increased. The speed is thereby restored to the rotational speed of the screw machine 8 when the earth pressure value returns to the set earth pressure value. When the earth pressure value does not decrease, the propulsion speed is decelerated. Thereafter, when the earth pressure value is restored to the set earth pressure value, the advancing speed is resumed.

On the other hand, when the earth pressure value is small, the rotational speed of the screw machine 8 is decelerated, and when the earth pressure value returns to the set earth pressure value, the rotational speed of the screw machine 8 is restored. When the earth pressure value does not rise, the propulsion speed is increased to continue the driving state. The reason for this is that it is preferable that the advancement speed is fast. Of course, if the earth pressure value becomes the set earth pressure value, the driving is continued with the driving state at this time.

The gravel discharge device 30 of the earth pressure shield propulsion machine of the present embodiment includes a belt type shaftless screw machine 8 connected to the cutter chamber 5, and the maximum transportable gravel diameter M is the radius of the transport path 31 ( D2/2) or more, and excavating sand containing a gravel portion from the cutter chamber 5; and a drain pipe 25 connected to the screw machine 8 having a transport path 31 having a diameter D1 smaller than that of the screw machine 8. The carry-out path 35 of the diameter D2 is set to be longer than the length of the piston zone by the pressure loss of the excavated sand and gravel; therefore, the large-diameter can be appropriately transported by the belt-type screwless machine 8 and the earth-moving pipe 25. The gravel, and the length of the earthmoving pipe 25 is formed by forming the piston zone by the pressure loss of the excavation sandstone, thereby compensating for the deficiency of the belt type shaftless screwing machine 8, thereby ensuring the earth pressure shield method construction.

That is, the belt type shaftless screw machine 8 cannot transport the excavated sand and gravel in a compact state, especially in the excavated sandstone containing the boulders, and the unloading of the gravel by the boulders retreats and unsteadily rolls, so that the screwing machine 8 The pressure is extremely unstable, but the earth drain pipe 25 is set to the length of the piston zone by the pressure loss of the dredged sand conveyed along the carry-out path 35, and can be self-drained by the formation of the piston zone. Through the screw machine 8, a soil pressure capable of maintaining a balance with the earth pressure of the excavation surface is generated in the cutter chamber 5, so that the earth pressure shield can be safely constructed.

Further, the groundwater pressure can be appropriately prevented by the piston zone, thereby preventing the occurrence of discharge.

As described above, in the belt type shaftless screw machine 8, the earth drain pipe 25 which forms the piston zone by pressure loss is combined to compensate for the disadvantages thereof, so that even if it is a site in which a large amount of gravel is scattered, the propulsion operation can be performed without being inferior. Usually excavate ordinary gravel layers.

In addition, since the air supply pipe 36 or the water supply pipe 37 is connected to the earth drain pipe 25, the fluidity of the dredged sandstone can be adjusted, and the pressure loss can be controlled, and the piston can be appropriately formed while preventing clogging or the like in the earth drain pipe 25. Area.

1. . . Earth pressure shield drive

2. . . Rotary cutter

3. . . Surface plate

4. . . Partition wall

5. . . Cutter chamber

6. . . Ring piece

7. . . Diffuse shield jack

8. . . Belt type shaftless screw machine

8a. . . Loading end

8b. . . Discharge end

9. . . Follow-up trolley

10. . . Cab

11. . . Center drill

12. . . Hub

13, 14. . . drill

15. . . Roller cutter

16. . . Spoke

17. . . Intermediate ring

18. . . Peripheral ring

19. . . Restricted protrusion

20. . . First injection means

twenty one. . . Second injection means

twenty two. . . Third injection means

twenty three. . . Temperature sensor

twenty four. . . control panel

25. . . Drain pipe

26. . . The bandits moved out of the trolley

30. . . Sand and gravel discharge device

31. . . Filing machine transport path

32. . . Inner cylinder

33. . . blade

34. . . Fixed outer tube

35. . . Discharge path

36. . . Air supply pipe

37. . . Water supply pipe

38. . . Sandstone retention

D1, D2. . . diameter

M. . . Gravel path

R. . . Boulder loading limit area

X. . . Boulder

Z. . . Excavation face

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic side cross-sectional view showing a preferred embodiment of a sand and gravel discharge device for a earth pressure shield propulsion machine according to the present invention.

Figure 2 is a front elevational view of the rotary cutter of the earth pressure shield propeller shown in Figure 1.

Fig. 3 is a schematic cross-sectional view showing the belt type screwless machine of the sand removing device of the earth pressure shield propeller shown in Fig. 1.

Fig. 4 is a side elevational view showing the main part of the connecting portion of the belt type shaftless screw machine and the earth discharging pipe shown in Fig. 3.

Figure 5 is an arrow view of the direction A in Figure 4.

Fig. 6 is a graph showing a particle size accumulation curve of a preferred land using the sand discharge device of the earth pressure shield propeller of the present invention.

8. . . Belt type shaftless screw machine

8b. . . Discharge end

25. . . Drain pipe

30. . . Sand and gravel discharge device

31. . . Filing machine transport path

35. . . Discharge path

36. . . Air supply pipe

37. . . Water supply pipe

38. . . Sandstone retention

D1, D2. . . diameter

Claims (3)

The sand and gravel discharge device of the earth pressure shield propulsion machine is opposite to the earth pressure of the excavation surface, and comprises a cutter chamber which is excavated by the rotary cutter and is pulverized and filled in the rear of the rotary cutter. The gravel portion of the gravel portion is discharged from the cutter chamber to the outside, and is characterized in that: a belt type shaftless screw machine is connected to the cutter chamber, and the maximum transportable gravel diameter is the radius of the transport path. And transferring the excavated sand containing the gravel portion from the cutter chamber; the drain pipe is connected to the screw machine, and has a carry-out path having a diameter smaller than a diameter of the transport path of the screw machine, and The length of the piston zone is set to be greater than the length of the piston zone due to the pressure loss of the dredged sand; and the sandstone retention portion is formed at the discharge end of the screw machine and the drain pipe formed with the piston zone The portion is formed by an inner diameter larger than a diameter of the transport path of the dump pipe and the transport path of the screw machine. The sand discharge device of the earth pressure shield propulsion machine according to the first aspect of the invention, wherein the earth drain pipe is connected to an air supply pipe for supplying air to the carry-out path for adjusting the fluidity of the excavation sand. The sand discharge device of the earth pressure shield propulsion machine according to the first or second aspect of the invention, wherein the earth drain pipe is connected to the water supply pipe for supplying water to the carry-out path for adjusting the fluidity of the excavation sand.