KR100557266B1 - Soil remover for underground pipe layer - Google Patents

Abstract

The earth pressure balance of the cutter head is always kept constant, stable propulsion is carried out, and the discharge amount is easily controlled.

This isolation chamber 20 has a screw conveyor 14 for conveying the earth and sand introduced into the machine by the rotation of the cutter head to the rear, and an isolation chamber 20 for receiving the earth and sand conveyed by the screw conveyor 14. The rotary conveying member 18 for rotating and conveying the soil by rotating the screw around the screw conveyor shaft, the discharging pipe 6 arranged to communicate with the sequestering chamber 20 at a predetermined rotational position of the sequestering chamber 20, and the discharging pipe It is set as the structure provided with the vacuum dissipation apparatus which attracts the earth and sand in (6).

Description

Soil Remover for UNDERGROUND PIPE LAYER}

BRIEF DESCRIPTION OF THE DRAWINGS The whole block diagram of the small diameter tube embedding apparatus which concerns on one Embodiment of this invention.

2 is a longitudinal cross-sectional view of the small-diameter pipe embedding apparatus according to the present embodiment.

3 is an enlarged view illustrating main parts of FIG. 2;

FIG. 4A is a cross-sectional view taken along the line A-A of FIG. 3, and FIG. 4B is the arrow direction B in FIG. 4A.

5 is a perspective view of a rotational conveying member.

FIG. 6A is a cross-sectional view taken along the line C-C of FIG. 2, and FIG. 6B is the arrow direction D of FIG.

7 is a longitudinal cross-sectional view of a small diameter tube embedding apparatus according to the prior art;

8 is a longitudinal cross-sectional view of another small diameter tube embedding apparatus according to the related art.

* Explanation of symbols for the main parts of the drawings *

2: propulsion device 3: lead pipe

4: buried pipe 5: cutter head

6: discharging pipe 7: vacuum discharging device (suction means)

14: screw conveyor 14a: screw casing

15 chamber 16: pinch valve

18: rotating conveying member (rotating conveying means)

18a: rotary wing 19: casing

20: containment chamber 21: cutout

22: air pipe

24: compressed air supply nozzle (air introduction means)

25: pressure sensor

The present invention relates to a soil discharging device for discharging excavated soil in a small diameter tube embedding apparatus.

Conventionally, there is one disclosed in Japanese Patent Application Laid-open No. Hei 10-196286, which is proposed by the present applicant as a discharging device of such a small diameter tube embedding apparatus. The small diameter tube embedding apparatus disclosed in this publication is, as shown in Fig. 7, the lead pipe 51 including the front lead pipe 51a and the rear lead pipe 51b, and the lead pipe 51a. ) Is supported by the cutter drive motor 52 and driven by the cutter drive motor 52 and the screw conveyor 55 disposed to penetrate the center of the lead pipe 51 and driven by the screw drive motor 54. ), A topless pipe 56 connected to the rear end of the screw conveyor 55, and a vacuum device (not shown) connected to the rear end of the topless pipe 56 with a vacuum hose (not shown) interposed therebetween. And an air pipe 57 which communicates with the front end portion of the discharging pipe 56 and whose end portion is released into the buried pipe, and is connected to the front end of the discharging pipe 56 and is the inlet of the discharging pipe 56. A compressed air supply pipe (not shown) for introducing compressed air into the There is sex. Moreover, the pinch valve 58 is arrange | positioned at the intermediate part of the said screw conveyor 55, and the outflow discharge | discovery discharge of the soil and ground water is controlled by this pinch valve 58. As shown in FIG.

In this conventional apparatus, the earth and sand excaved by the cutter head 53 and introduced into the chamber 59 are conveyed backward by the screw conveyor 55, and the discharge pipe 56 is removed from the rear end of the screw conveyor 55. After being introduced into the furnace), it is suctioned and discharged by a vacuum device placed on the ground through its top pipe 56 and a vacuum hose. At this time, the earth and sand are conveyed by the air flow from the air pipe 57 generated by vacuum suction. And the conveyance force and conveyance amount are attained by adding the compressed air pressure sprayed from a compressed air supply pipe to the vacuum pressure of a vacuum apparatus as needed at the time of conveyance by this discharging pipe 56. In addition, the compressed air injected by tightening the pinch valve 58 at the time of the discharge is prevented from flowing back to the excavation surface side, and the amount of the discharge is adjusted by adjusting the opening amount of the pinch valve 58.

As another prior art, there is one disclosed in Japanese Patent Laid-Open No. 2520265. In the underground excavating apparatus disclosed in this publication, as shown in FIG. 8, the rotary feed member 62 which coaxially rotates with the cutter head 61 is arrange | positioned immediately after the cutter head (rotary cutter) 61, and the cutter head The soil excavated by the 61 is accommodated in the excavation accommodating feed hole 63 above the rotary conveying member 62, and the rotary conveying member 62 is rotated to the downward excavation outlet 64. When it reaches the opposite position, it is comprised so that it may be conveyed toward the excavation discharge pipe path 66 of the back by the compressed air injected from the air injection chamber 65. FIG.

However, in the apparatus described in Japanese Patent Laid-Open No. 10-196286, since the discharging pipe 56 for vacuum discharging is in communication with the chamber 59 and the screw conveyor 55 of the cutter head 53 without any space. The negative pressure generated at the intake port of the discharging pipe 56 passes through the screw conveyor 55 and affects the balance of the earth pressure in the chamber 59, which may adversely affect the natural ground on the excavation surface side. In addition, in this conventional apparatus, although the amount of discharge | emission is adjusted by the pinch valve 58 arrange | positioned at the intermediate part of the screw conveyor 55, when this discharge | polishing index control does not function by this pinch valve 58, There is a problem that a large amount of groundwater flows into the discharging pipe 6 and the discharging pipe 56 is closed.

On the other hand, in the apparatus described in Japanese Patent Laid-Open No. 2520265, since the rotary feed member 62 is coaxial with the cutter head 61 and rotates in synchronism, the introduction control of the earth and sand is controlled by the rotation of the cutter head 61. It is very difficult to balance the excavated soil and the clay by relying on water control, and there is a problem in that it is easy to cause collapse or protrusion of the excavated surface due to over-introduction of the soil, and even ground depression. In addition, in the prior art, when the natural ground such as pebbles are excavated, it is difficult to smoothly introduce the pebbles into the rotational conveying member, so that the rotational loss is very large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and to provide a discharging device for a small-diameter tube embedding apparatus that can maintain stable earth pressure balance of the cutter head at all times and perform stable propulsion at the same time. It is for the purpose.

In order to achieve the above object, the discharge device of the small-diameter pipe embedding apparatus according to the present invention is a screw conveyor for conveying the soil sand introduced into the machine to the rear by the rotation of the cutter head, and the soil sand conveyed by the screw conveyor. Rotation conveying means for rotating and conveying the earth and sand by rotating the isolation chamber about a screw conveyor shaft, a discharge pipe disposed to communicate with the isolation chamber at a predetermined rotational position of the isolation chamber, and the soil in the soil pipe. It is characterized by including a suction means for sucking.

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The earth and sand introduced into the machine by the rotation of the cutter head is conveyed backward by the screw conveyor, and is accommodated in the isolation chamber of the rotary conveying means at the rear end of the screw conveyor, and then the rotary conveying means rotates to a predetermined rotational position. When the said isolation chamber communicates with a discharge pipe, it is conveyed and discharged further backward by the discharge pipe by the suction force of the suction means connected to the discharge pipe. According to the present invention, since the discharge pipe acting on the suction force of the suction means is isolated from the screw conveyor and the cutter head chamber by the isolation chamber of the rotation transfer means, the negative pressure generated in the discharge pipe can be adjusted to atmospheric pressure in the isolation chamber, This negative pressure can be prevented from being transmitted to the screw conveyor part. Therefore, the earth pressure balance in the cutter head can be kept constant at all times, and stable propulsion can be performed at all times. In addition, even if groundwater is likely to flow out backward due to the inability to control the discharge index control means such as a pinch valve disposed in the middle of the screw conveyor, the inflow of the groundwater can be blocked by the rotation transfer means, thereby preventing the inflow into the discharge pipe. Therefore, it is possible to prevent the occurrence of a situation such as the closing of the discharging pipe in advance. In addition, there is an effect that the balance of the excavated soil and the clay can be easily adjusted to prevent the collapse of the excavated surface due to over-introduction of the soil.

In the present invention, it is preferable that the isolation chamber communicates with the discharging pipe when the soil is received from the screw conveyor when the screw conveyor is in the lower position of the screw conveyor and rotated to the upper position of the screw conveyor. In this way, the earth and sand can be smoothly introduced from the screw conveyor into the isolation chamber, so that there is no conveyance loss and the waste can be efficiently discharged.

Moreover, it is preferable that the air pressure adjustment mechanism which consists of a pressure sensor which detects the air pressure in the said isolation | separation chamber, and the air introduction means which introduces air into the said isolation | separation chamber according to the pressure detected by this pressure sensor is formed. By forming such an air pressure adjusting mechanism, the suction of the earth and sand can be terminated, and the air pressure in the isolation chamber in the negative pressure state can be adjusted to atmospheric pressure, and the influence of the negative pressure on the screw conveyor can be reliably eliminated.

Alternatively, only compressed air introduction means for canceling the negative pressure of the isolation chamber may be formed. It is very difficult to maintain the airtightness of the isolation chamber for a long time in the rotating conveying means rotating in the environment where the soil passes, and some leakage occurs with time. Therefore, as described above, the effect of the negative pressure on the screw conveyor can be greatly reduced only by introducing a predetermined amount of compressed air into the isolation chamber without detecting the pressure in the isolation chamber and precisely adjusting the air pressure. .

Embodiment of the Invention

Next, it demonstrates, referring specific embodiment of the discharging apparatus of the small diameter pipe embedding apparatus which concerns on this invention.

Fig. 1 shows an overall configuration diagram of a small diameter tube embedding apparatus according to an embodiment of the present invention, and Fig. 2 shows a longitudinal sectional view of the small diameter tube embedding apparatus according to the present embodiment. 3 is an enlarged view of the main part of FIG. 2, an AA cross-sectional view of FIG. 3 is shown in FIG. 4A, and an arrow direction B diagram of FIG. 4A is shown in FIG. 4B, FIG. 5. Is a perspective view of the rotational conveying member, FIG. 6A is a cross-sectional view taken along line CC of FIG. 2, and FIG. 6B is an arrow direction D diagram of FIG. 2, respectively.

In the small-diameter pipe embedding apparatus according to the present embodiment, as shown in FIG. 1, the propulsion device 2 is provided in the oscillation vertical shaft 1, and the buried pipe 4 is successively connected to the rear of the lead pipe 3. While excavating the excavation surface by the cutter head 5 formed at the front end of the pipe 3, the rear end of the buried pipe 4 is pressed by the propulsion cylinder of the propulsion device 2, and the buried pipe 4 is provided. It is to propel this earth.

The screw conveyor 14 mentioned later is arrange | positioned at the center part in the said lead pipe 3, and the discharge pipe | tube (basket pipe) 6 is arrange | positioned behind this screw conveyor 14, and this discharge pipe ( 6) It is connected to the above-mentioned vacuum discharging device (vacuum car 7 in this embodiment) as this suction means. Soil excavated by the cutter head 5 is conveyed to the rear by the screw conveyor 14, and is then discharged into the vacuum discharging device 7 or into a separate tank through the discharging pipe 6 by vacuum suction. Here, the propulsion device 2 is controlled and operated by the controller 8 and the hydraulic unit 9. Moreover, the excavation adhesive etc. to the front-end | tip of the cutter head 5 are conveyed by the extension hose from the pump 10 on the ground.

As shown in FIG. 2, the lead pipe 3 has a front face 3a for supporting the cutter head 5 through the bearing 12 at the front end portion, and a spherical surface at the rear end of the lead line 3a. It is comprised by the rear lead pipe 3b in which rocking | fluctuation is supported freely through the bearing 11. The cutter head 5 is rotationally driven by the cutter drive motor 13 here.

Moreover, the screw conveyor 14 is arrange | positioned so that all may penetrate the center part of the lead pipe 3a and the rear lead pipe 3b. This screw conveyor 14 is opened in the chamber 15 whose front end part is formed in the back of the cutter head 5, and conveys the sands which were introduce | transduced in the chamber 15 back by the rotation of the cutter head 5 to the back. It is supposed to be. Moreover, the pinch valve 16 is arrange | positioned at the outer periphery of the intermediate part of the screw conveyor 14, and the discharge amount etc. are controlled by this pinch valve 16. As shown in FIG.

The screw conveyor 14 is configured by accommodating a screw made of a screw shaft 14b and a blade 14c in a screw casing 14a, and is driven by a screw drive motor (hydraulic motor) 17 disposed at a rear end thereof. .

At the base end (rear end) of the screw shaft 14b, a rotational conveying member (rotational conveying means of the present invention) having a plurality of rotating blades 18a coaxial with the screw shaft 14b (in this embodiment, six). 18) is fixed (see FIG. 5). This rotational conveying member 18 has its outer circumference covered with a cylindrical casing 19 consisting of a front plate 19a, a back plate 19b and an outer circumferential plate 19c, while its inner circumferential portion is covered with the screw casing 14a. It is rotated in the space covered by the. The isolation chamber 20 is partitioned between the rotary vanes 18a and 18a adjacent to each other. Moreover, the clearance gap between the wall surface (wall surface of the casing 19 and the wall surface of the screw casing 14a) of the isolation chamber 20, and the rotary blade 18a is set to the minimum clearance in order to prevent the outflow of groundwater. .

In addition, a cutout portion 21 as a soil dropping port is formed in the lower end of the rear end of the screw casing 14a, and the earth and sand, which has been conveyed by the screw conveyor 14, is separated through the cutout portion 21. ) To fall into. On the other hand, the upper part of the casing 19 is in communication with a discharging pipe (basket tube) 6 in which the whole is in communication with the air pipe 22 and the rear part is formed to face the air pipe 22. As shown in Fig. 6, the air pipe 22 branches into two branches, and the proximal end thereof is released into the lead pipe through the pinch valves 23a and 23b, respectively. The earth and sand lifted upward by the isolation chamber 20 of the rotational conveying member 18 in this way is discharged by the air flow sucked from the pinch valves 23a and 23b when it comes to a position in communication with the air pipe 22. Is air transported towards. Here, the pinch valves 23a and 23b can be remotely operated and opened and closed by pneumatic pressure. The pinch valves 23a and 23b are in a fully open state at the time of normal soil intake and are fully closed at a stop. This prevents groundwater from the screw conveyor 14 and return water from the earth and sand pipe 6 from overflowing into the machine.

As shown in FIG. 5, the rotation conveying member 18 includes a substrate 18d in which six convex portions 18b and notches 18c are alternately formed in the outer peripheral portion thereof, and the substrate 18d. And the notches 18c are formed in a substantially arcuate shape, and the diameter of the arc is slightly smaller than the inner diameter of the clay pipe 6. It is set to lose. In addition, the rotor blade 18a has an outer circumferential surface formed on an arcuate surface along an inner surface of the outer circumferential plate 19c of the casing 19, and an outer circumferential surface is formed on an arcuate surface along the outer surface of the screw casing 14a, both sides. The inlet side of the soil is wider and narrower as it goes inward, and the front side of the excavation direction is wider, and is formed in a curved shape narrowing toward the rear. Thus, the rotor blade 18a becomes the shape which improved the introduction property of earth and sand, ensuring the bonding strength with respect to the board | substrate 18d. Moreover, the rotation conveyance member 18 is rotated in the arrow direction P in FIGS. 4 and 5.

By the way, the sediment suction suctioning isolation | separation chamber 20 by the said discharge pipe | tube 6 is in the negative pressure state by the suction resistance of the inlet of pinch valve 23a, 23b, and the air inflow resistance of the air pipe 22, and this negative pressure state As the isolation chamber 20 rotates downward and reaches the lower soil inlet (below the cutout portion 21), the screw conveyor 14 may become negative pressure, which may affect the excavation surface. In FIG. 4A, an air pressure adjusting mechanism comprising a compressed air supply nozzle (air introduction means) 24 and a pressure sensor 25 is formed so as to correspond to the isolation chamber 20 immediately after the end of the soil suction. Compressed air is supplied from the compressed air supply nozzle 24 into the isolation chamber 20 by the signal from the controller 8 based on the air pressure detection by the pressure sensor 25. In this way, since the isolation chamber 20 immediately after the end of the soil suction is pressure-adjusted to always be at atmospheric pressure, the influence of the negative pressure on the screw conveyor 14 portion can be reliably eliminated. Moreover, this pressure adjustment can also be automated using an electromagnetic proportional pressure reducing valve, and even in this case, the grounding equipment, extension hose, etc. which are necessary for the pressure supply can also be made light.

In the present embodiment, the pressure in the isolation chamber 20 is adjusted to be atmospheric pressure based on the air pressure detected by the pressure sensor 25. However, the predetermined amount of compressed air is determined in the isolation chamber without forming a pressure sensor. By only introducing, the influence of the negative pressure on the screw conveyor portion can be greatly reduced. This is because it is very difficult to maintain the airtightness of the isolation chamber for a long time in the rotation conveying means rotating in an environment where soil is passing through, so that some leakage occurs with time, and thus it is not necessary to strictly adjust the pressure to such an extent.

In the small diameter tube embedding apparatus of the present embodiment, the earth and sand excavated by the rotation of the cutter head 5 is introduced into the chamber 15 and conveyed backward through the pinch valve 16 by the screw conveyor 14. At this time, the earth pressure is detected by detecting the earth pressure on the upstream side of the pinch valve 16 and controlling the pinch valve 16 in accordance with the detected earth pressure. The earth and sand conveyed to the rear end of the screw conveyor 14 in this way is a space between the isolation chamber 20 (rotary vanes 18a) of the rotary conveying member 18 from the cutout portion 21 formed at the end of the screw casing 14a. ) Falls into.

Since the rotary conveying member 18 is rotated coaxially with the screw conveyor 14, when the earth and sand introduced into the isolation chamber 20 moves upward with the rotation and moves to just above the earth and sand introduction position, the whole air pipe While communicating with (22), the rear part communicates with the discharge pipe (6). Thus, the earth and sand in the isolation chamber 20 are discharged from the discharge pipe 6 from the vacuum discharge device 6 by the air flow sucked through the pinch valves 23a and 23b and the air pipe 22 by the vacuum pressure from the vacuum discharge device 7. 7) is aspirated by aspiration.

According to the small-diameter pipe embedding apparatus of the present embodiment, since the cutter head 5 for excavating the excavation surface and the screw conveyor 14 for conveying the excavated soil are configured to be driven by a separate drive device, the excavated soil and the soil are excavated. Can be easily controlled and the occurrence of collapse of the excavated surface can be prevented by over-introduction of the soil.

In addition, the discharging pipe 6 to which the suction force from the vacuum discharging device 7 acts is isolated from the screw conveyor 14 by the isolation chamber 20 of the rotation transfer member 18, and furthermore, to the discharging pipe 6; Since the generated negative pressure is configured to be adjusted to atmospheric pressure by the compressed air supply nozzle 24 and the pressure sensor 25, the suction pressure from the vacuum discharging device 7 is applied to the screw conveyor 14 part and the cutter head 5. It is not delivered to wealth. Therefore, the earth pressure balance in the chamber 15 of the cutter head 5 can be improved and kept constant, and stable propulsion can always be performed. In addition, even when groundwater is caused to flow in a large amount to the rear due to the uncontrollability of the pinch valve 16 arranged in the middle of the screw conveyor 14, the inflow of the groundwater can be blocked by the rotary conveying member 18, and the discharge pipe 6 is discharged. Since it is possible to prevent the inflow of water, it is possible to prevent the occurrence of a situation such as the closing of the discharging pipe 6 in advance. As a result, it is possible to provide a small-diameter burying device suitable for long distance propulsion.

In addition, the effect of the negative pressure on the screw conveyor can be greatly reduced only by introducing a predetermined amount of compressed air into the isolation chamber without forming a pressure sensor.

Claims (4)

It has a screw conveyor for carrying back the soil introduced into the machine by the rotation of the cutter head, and an isolation chamber for accommodating the soil which has been conveyed by the screw conveyor, while rotating the isolation chamber around the screw conveyor shaft to rotate and transport the soil. And a discharge pipe disposed to communicate with the isolation chamber at a predetermined rotational position of the isolation chamber, and suction means for sucking the soil in the soil distribution pipe. The small-diameter pipe embedding apparatus according to claim 1, wherein the isolation chamber receives soil from the screw conveyor when it is in a lower position of the screw conveyor and communicates with the discharging pipe when rotated to an upper position of the screw conveyor. Device. The air pressure adjusting mechanism according to claim 1 or 2, wherein a pressure sensor for detecting air pressure in the isolation chamber and an air introduction means for introducing air into the isolation chamber in accordance with the pressure detected by the pressure sensor are formed. Topdressing device of landscape burial system. The device for discharging the small-diameter pipe embedding apparatus according to claim 1 or 2, wherein compressed air introduction means for canceling negative pressure in said isolation chamber is formed.

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