JP2675727B2 - Sediment pumping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth and sand pumping device, and more specifically, when excavating an underground hole, that is, a tunnel for constructing a sewer or the like, the earth and sand excavated at the face part of the tunnel is pressed. The present invention relates to a device for hanging and carrying out backward.

[0002]

2. Description of the Related Art In a tunnel having a relatively small diameter used for laying underground pipes such as sewer pipes and gas pipes, it is difficult for an operator to enter the tunnel and perform various works. . In particular, it can be said that it is practically impossible for a worker to perform heavy labor such as carrying out excavated soil in a narrow tunnel.

Therefore, in a small-diameter tunnel, it is required to automate or mechanize the work of carrying out earth and sand and other works. Conventionally, for example, a screw conveyor has been used as a means for carrying out excavated earth and sand. The screw conveyor sends earth and sand in the axial direction of the screw by rotationally driving the screw inside the tubular body. However, in this screw conveyor, it is necessary to arrange the screw and the pipe body over the entire length from the cutting face in the tunnel to the rear end, and to provide a drive source such as a motor at the end thereof. Therefore, if the tunnel becomes long, it takes time and effort to connect the screw and the pipe body to the rear one by one. In addition, a very large motor capacity is required. Since a large amount of power is transmitted, the diameters of the screw and the tube are also increased, and the volume occupied in the tunnel is increased. Therefore, it is difficult to apply the screw conveyor to a tunnel having a small diameter among small diameter tunnels.

A pressure feed cylinder is also used as a means for discharging the excavated earth and sand. The pressure-feeding cylinder consists of a piston-cylinder mechanism that is hydraulically and pneumatically driven, and the reciprocating operation of the piston causes the excavated earth and sand to be temporarily sucked into the cylinder, and the piston applies pressure to the earth and sand to connect it to the rear of the cylinder. Send out to a pressure pipe. In this case, the pressure pipe is
Since it is just a hollow tube and does not have a screw or the like built therein, the tube diameter may be small. As a result, the occupied volume in the tunnel is small, and the pipes can be easily connected to each other, so that it can be favorably applied to a long tunnel.

However, when the excavated earth and sand is directly sent to the pressure-feeding cylinder, there is a case where the earth and sand are clogged in the cylinder or the pressure-feeding pipe and the earth-and-sand cannot be conveyed. Since the pressure-feeding cylinder only pushes the earth and sand in one direction, if the earth and sand clogs are clogged, even if the piston pressure is increased, the earth and sand are only compacted and cannot be carried out backward.

Therefore, it has been proposed to use a screw feeder having a mechanism similar to the above-mentioned screw conveyor and a pressure feeding cylinder in combination. First, the excavated earth and sand is sent to a screw feeder, and is stirred while being sent backward in the screw feeder to break up a large lump of earth and sand into small pieces. If muddy water is added to the sediment, the collapse or crushing of the sediment can be performed more reliably. If the sand and sand discharged from the screw feeder are sent to the pressure-feeding cylinder, the sand and sand that have been crushed into small pieces and have increased fluidity can be smoothly carried out backward by the piston of the pressure-feeding cylinder.

[0007]

However, in the earth and sand pumping apparatus in which the screw feeder and the pumping cylinder are combined as described above, it is not possible to secure a sufficient space for laser surveying in the tunnel, and the surveying work cannot be performed. There was a problem that it was difficult to do. This is because the screw feeder and the pressure feeding cylinder are arranged one above the other in the above-mentioned conventional earth and sand pressure feeding device, so that the space above the tunnel is closed and it is difficult to apply laser surveying which requires a large space. The screw feeder and the pressure feeding cylinder are arranged above and below in order to smoothly suck the earth and sand into the pressure feeding cylinder. If the earth and sand are naturally dropped from the screw feeder and dropped into the pressure feeding cylinder, the earth and sand are smoothly sucked into the pressure feeding cylinder during the suction operation of the piston. It was thought that unless such a free fall of earth and sand was used, the earth and sand could not be fed into the pressure-feeding cylinder smoothly and the earth and sand could not be carried out properly.

[0008] Therefore, an object of the present invention is to ensure a sufficient working space for laser surveying and the like and to efficiently carry out the earth and sand in the earth and sand feeding apparatus in which the screw feeder and the pressure feeding cylinder are combined as described above. To provide a device that can.

[0009]

A sediment pumping device according to the present invention for solving the above problems is a device for pumping excavated sediment backward in a tunnel, while stirring the excavated sediment. The screw feeder sent to the rear and the reciprocating operation of the piston in the cylinder draws in the soil sent from the screw feeder into the cylinder, pressurizes it with the piston, and sends it out to the rear pressure transfer pipe. In addition, a ball valve is provided between the sediment discharge port of the screw feeder and the sediment discharge port of the pressure feeding cylinder and the sediment discharge port connected to the pressure pipe.The rotation of this ball valve connects the sediment discharge port with the sediment suction port. The state can be switched between blocking the earth and sand outlet side and blocking the earth and sand outlet from the earth and sand outlet. It has become to so that.

As the basic structure of the screw feeder and the pressure-feeding cylinder, the same structures as those of a normal screw feeder and the pressure-feeding cylinder, which have been conventionally used in various tunnel excavating devices, can be adopted. Specifically, for example, a screw feeder is composed of a screw that is rotationally driven by a hydraulic / pneumatic motor or an electric motor, and a tube body that accommodates this screw, and at the tip of the screw feeder, a hopper that receives earth and sand is provided. It is provided. The hopper is provided in a position and structure that can receive the earth and sand excavated by an excavating mechanism such as an auger installed in the face of the tunnel. At the rear end of the screw feeder, a sediment discharge port for discharging sediment is provided. The earth and sand discharge port is opened on the side surface of the pipe body.

The pressure feed cylinder comprises a cylinder and a piston that reciprocates inside the cylinder, and the piston is driven by hydraulic pressure, electromagnetic force, or the like. At the tip of the cylinder, there is an earth and sand suction port for sucking and discharging the sand and applying pressure. Both the screw feeder and the pressure-feeding cylinder are in the shape of a slender shaft or cylinder. Both are arranged horizontally, and the earth and sand outlet of the screw feeder and the earth and sand inlet of the pressure-feeding cylinder are arranged on the same side in the axial direction. I'll do it. The earth and sand outlet of the screw feeder and the earth and sand inlet of the pressure feeding cylinder are arranged at substantially the same height, but the earth and sand outlet of the screw feeder may be arranged to be slightly higher. The positions of the screw feeder and the pressure-feeding cylinder may be set so as not to interfere with the work such as laser surveying performed in the tunnel.

A ball valve is arranged at a position connected to the earth and sand discharge port of the screw feeder and the earth and sand discharge port of the pressure feed cylinder. The basic structure of the ball valve can be the same as the normal ball valve used in various mechanical devices, but it must have a structure suitable for handling the earth and sand excavated in the tunnel. preferable.

In the ball valve, a sediment feeding port is provided at a position on the opposite side of the sediment feeding and discharging port of the pressure feeding cylinder in the diameter direction. . The pressure pipe has a structure that can be sequentially connected in the longitudinal direction. A specific structure of the ball valve is composed of a ball valve having a spherical surface and a valve body having a spherical space for accommodating the ball valve. The ball valve is provided with a passage space which penetrates in the diametrical direction and also communicates in one radial direction orthogonal to the diametrical direction and which communicates in a total of three directions. Of the plurality of openings provided on the inner surface of the valve body, the passage spaces communicating in these three directions are
It can be placed in any opening. The opening of the valve body is communicated with the sediment discharge port, the sediment intake port, and the sediment delivery port. Specifically, the opening of the valve body may be directly connected to the earth and sand discharge port or the like, or may be connected to the earth and sand discharge port and the like from the opening of the valve body through a pipe line.

In the ball valve having such a structure, when the ball valve is rotated, the passage space communicates with the earth and sand discharge port and the earth and sand intake / exhaust port, and the passage space does not communicate with the earth and sand discharge port. The mouth and the sand discharge port can be communicated with each other, and the communication with the sediment discharge port can be freely switched. It is preferable that the ball valve is provided with a cylindrical valve seat having a sealing function at the tip of each opening of the valve body that abuts and slides on the peripheral surface of the ball valve. If the metal packing is attached to the tubular valve seat, the airtightness between the ball valve and the valve body is improved, and the ball valve is not damaged by contact with earth and sand. If a spring that presses the metal packing against the ball valve is provided, the airtightness will be further improved. Instead of the spring, a biasing means such as hydraulic / pneumatic pressure may be provided. For metal packing,
An ordinary metal packing material is used, and for example, a metal alloy having excellent wear resistance or steel that has been subjected to a quenching treatment to improve wear resistance is preferable. As a ball valve,
The use of annealed steel or the like having a surface coated with tungsten carbide can prevent the occurrence of seizure. If the valve body has an opening that is connected to the earth and sand discharge port, etc., and is closed with a removable cover,
The shield lid can be opened to inspect the inside of the ball valve or the like.

Further, as a ball valve, the cylindrical valve seat is supported so as to be rotatable about its central axis, and a gear portion is provided on the outer periphery of the cylindrical valve seat, and the gear portions of the plurality of cylindrical valve seats are provided. When the meshing drive gear is attached to the rotary shaft of the ball valve via the ratchet mechanism so as to be rotatable in only one direction, the contact position or the contact direction of the cylindrical valve seat with respect to the peripheral surface of the ball valve can be changed. It can be changed automatically according to the opening / closing operation of.

As for the shape and meshing structure of the gear portion and the driving gear, various ordinary gear mechanisms can be adopted, but the gear portion of the tubular valve seat in a plurality of directions rotates in a direction orthogonal to the gear portion. To mesh the drive gears, it is preferable to use a cross shaft gear mechanism such as a crown gear. If the tooth profile of the drive gear is provided intermittently, the tubular valve seat will rotate only within the range where the tooth profile of the drive gear meshes with the gear section of the tubular valve seat, and the amount of rotation of the tubular valve seat will be appropriate. Can be set, or the rotational force required to rotate the plurality of cylindrical valve seats can be reduced. The ratchet mechanism has
A normal ratchet mechanism used in various known mechanical devices can be adopted.

The earth-and-sand pressure-feeding device comprising a screw feeder, a pressure-feeding cylinder and a ball valve is preferably constructed so that its entire length fits into a so-called pilot pipe that accommodates a tunnel excavation device. That is, it is preferable to set the length of the screw feeder, the cylinder length of the pressure feeding cylinder, and the stroke of the piston according to the length of the leading conduit. If the earth and sand pumping device is provided with traveling wheels, it is easy to carry the sand and sand pumping device into the tunnel and move it inside the tunnel. The excavator and the earth and sand pumping device can be integrated.

[0018]

If the screw feeder and the pressure feeding cylinder are arranged side by side in the horizontal direction, there is a wide space above the earth and sand pressure feeding device in the tunnel. If this wide space is used, various works performed in the tunnel, such as laser surveying, can be performed well.
However, when the screw feeder and the pressure feeding cylinder are lined up in the horizontal direction, it is difficult to supply the sand from the screw feeder to the pressure feeding cylinder as compared with the case where the screw feeder and the pressure feeding cylinder are lined up in the vertical direction. .

That is, if the screw feeder and the pressure-feeding cylinder are vertically aligned, even if the airtightness between the screw feeder and the pressure-feeding cylinder is a little poor, the earth and sand will naturally drop due to their own weight, and from the screw feeder to the pressure-feeding cylinder. And easily sent. However, if the screw feeder and the pressure-feeding cylinder are arranged side by side in the horizontal direction, it cannot be expected that the earth and sand will be fed by natural fall. Therefore, it is necessary to suck the earth and sand from the screw feeder into the pressure feeding cylinder only by the suction force that accompanies the retreat of the piston in the pressure feeding cylinder. If the airtightness between the screw feeder and the pressure feeding cylinder is low, even if the piston is retracted, a sufficient suction force cannot be applied, and suction of earth and sand cannot be performed smoothly.

Conventionally, a plate-shaped partition valve that slides back and forth has been provided between the screw feeder and the pressure feed cylinder that are vertically arranged. Such a partition valve has a drawback that it is inferior in airtightness because a gap is likely to be formed in a sliding portion of the partition valve. As described above, if a partition valve similar to the conventional one is provided between the screw feeder arranged horizontally and the pressure feeding cylinder, the airtightness of the valve part is inferior, so the suction of earth and sand into the cylinder is sufficient. I can't do it. In addition, if the partition valve is not airtight, there is a problem that when the pressure-feed cylinder attempts to pressure-load the soil, the soil in the pressure-feed cylinder returns from the partition valve to the screw feeder side. Further, the plate-shaped sluice valve is apt to be deformed or distorted when hard earth and sand collide or pressure is applied, and as a result, the airtightness is further reduced or the sluice valve does not operate smoothly. There was also a problem.

Therefore, in the present invention, the screw feeder and the pressure feeding cylinder are arranged side by side in the horizontal direction, and at the same time, the ball valve is used as a valve for controlling the flow of earth and sand, thereby improving the airtightness in the valve portion. The earth and sand can be smoothly supplied from the screw feeder to the pressure feeding cylinder. In the ball valve, since the spherical ball valve rotates and slides in the valve body having the same spherical shape, the airtightness between the ball valve and the valve body is extremely high. Since the earth and sand only pass through the passage space provided inside the ball valve, there is no concern that the ball valve will be deformed by the collision of earth and sand, and even if high pressure is applied,
No malfunction will occur.

Next, as the structure of the ball valve that achieves the above-mentioned operation, as described above, a plurality of cylindrical valve seats of the valve body, which are in contact with the peripheral surface of the ball valve and slide, are provided.
A gear is provided on the outer periphery of the cylindrical valve seat, which is supported so as to be rotatable about its central axis, and a drive gear that meshes with the gears of the plurality of cylindrical valve seats is attached to the rotary shaft of the ball valve via a ratchet mechanism. When it is attached so as to be rotatable only in one direction, the following effects can be achieved.

That is, when the rotating shaft of the ball valve is reciprocally rotated when the ball valve is opened and closed, the ratchet mechanism acts to intermittently rotate the drive gear in only one direction, and the cylinder meshes with the drive gear. Similarly, the valve seat also intermittently rotates little by little. When the tubular valve seat rotates, the position or posture of the tubular valve seat that contacts the peripheral surface of the ball valve changes. If the cylindrical valve seat is always in contact with the ball valve peripheral surface at the same position or posture, only certain parts will be worn, deformed or damaged due to local differences in material or uneven stress distribution. It becomes easier to get stuck. However, as mentioned above, if the position and posture of the tubular valve seat change little by little, the contact state with the peripheral surface of the ball valve will be averaged, and local wear or deformation will occur. Is less likely to occur, the sealing function of the tubular valve seat can be favorably maintained, and the life of the tubular valve seat is extended.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the entire structure of the earth and sand pumping device. As shown in FIGS. 3 and 4, the slender cylindrical screw feeder 10 and the similarly thin cylindrical pressure feeding cylinder 30 are horizontally arranged on the bottom side in the tunnel T.

The screw feeder 10 is a hydraulic motor 1.
Screw 12 driven by 4 and this screw 12
It is composed of a cylindrical body 11 that accommodates. A hopper 20 is provided in a portion of the screw feeder 10 which is on the face of the tunnel T facing the face. The hopper 20 has a large rectangular opening at the top, and the bottom end communicates with the cylinder 11 of the screw feeder 10. Although not shown, the hopper 20
The upper opening is located in the discharge direction of the earth and sand excavated by the excavation mechanism. A large number of through holes 13 are formed in the screw 12 on the hopper 20 side. This through hole 13
Has an action of promoting the collapse and crushing of the sand and sand which has just been sent from the hopper 20 and has a lot of lumps, and prevents clogging of the lump of earth and sand in the cylindrical body 11.

A water supply port 18 is provided on the end surface of the hopper 20 on the tip side of the screw 12. This water supply port 18
If water is supplied to the hopper 20, it is effective to stir and mix the water with the earth and sand in the hopper 20 or the cylindrical body 11 to increase the fluidity of the earth and sand. At the end opposite to the hopper 20, the screw 12 is not provided with a spiral blade, but is provided with a stirring rod 15 protruding in the radial direction. This is because it is not necessary to send the earth and sand in the axial direction on the end side, and the earth and sand can be satisfactorily stirred and crushed and sent to the pressure feeding cylinder 30 side. A sediment discharge port 16 is formed through the side surface of the cylindrical body 11 on the side of the pressure-feeding cylinder 30.

As shown in FIG. 2, the screw feeder 1
No. 0 is arranged with a slight inclination so that the hopper 20 side is low and the earth and sand discharge port 16 side is high. This is effective in gradually feeding the soil to the rear, that is, the sand discharge port 16 while surely stirring the sand in the screw feeder 10. The pressure feeding cylinder 30 is a cylindrical cylinder 32.
And a piston 36 that reciprocates inside the cylinder 32. A jacket 34 for cooling is provided on the outer periphery of the cylinder 32 to prevent overheating due to friction generated when the earth and sand are pressure-fed. At the tip of the cylinder 32, a sediment intake / exhaust port 38 is opened. The piston 36 is provided with a piston actuating portion 37 that largely projects from the end of the cylinder 32. Piston working part 3
A hydraulic pressure is supplied to 7 to operate the piston 36.

The earth and sand discharge port 16 of the screw feeder 10
And a ball valve 50 is provided between the earth and sand inlet / outlet 38 of the pressure feeding cylinder 30. The ball valve 50 converts the movement of the actuating cylinder 54, which is hydraulically driven, into rotational movement via the link 56, and rotationally operates it. Link 56
Limit switches 58, 58 are attached to both ends of the operating range of the above so as to detect the operating position of the link 56, that is, the switching state of the ball valve 50. On the side of the ball valve 50 opposite to the sediment inlet / outlet 38 of the pressure feeding cylinder 30, a delivery pipe 52 serving as a sediment delivery port.
Is attached.

Screw feeder 1 integrally assembled
As shown in detail in FIG. 3, the earth-and-sand pressure-feeding device including 0, the pressure-feeding cylinder 30, and the ball valve 50 includes a plurality of traveling wheels 60 in the front, rear, left, and right, and the earth-and-sand pressure-feeding device can freely move in the tunnel T. It can be done. Next, FIGS. 5 and 6 show the overall structure of the ball valve 50.

The ball valve 50 is composed of a substantially spherical ball valve 510 and a valve body 500 that houses the ball valve 510. In the valve body 500, a plurality of blocks are connected and integrated by bolts or the like. The ball valve 510 has a shape in which the upper and lower parts of the sphere are cut off,
Vertically vertical rotating shafts 514 and 516 are provided.
The ball valve 510 is made of a mild steel material having a surface of 30% tungsten carbide and a thickness of 2 mm which is self-fluxing sprayed to prevent seizure.

The rotating shafts 514 and 516 are bearings 518 and 518, which are needle bearings and the like.
0 supported. The upper end of the rotating shaft 514 has the link 5
It is connected to the working cylinder 54 via 6, and the back-and-forth motion of the working cylinder 54 is converted into the rotary motion of the rotary shaft 514. As shown in FIG. 6, the ball valve 510 is provided with a passage space 512. In the horizontal plane, the passage space 512 penetrates in one diametrical direction and has a circular shape, and also has a circular shape that communicates with the outer circumference in one radial direction orthogonal to the diametrical direction. A plane T-shaped passage space 512 is provided.

The ball valve 510 is provided on all sides of the ball valve 510.
An annular packing block, that is, a cylindrical valve seat 520 corresponding to the opening shape of the passage space 512 is provided on the inner surface of 0. As shown in detail in FIG. 5, the packing block 520 includes a packing portion 524 having a spherical surface that abuts the outer peripheral surface of the ball valve 510. Packing part 5
24 is formed of a normal packing material made of metal or abrasion resistant resin. The entire packing block 520 may be made of a packing material, but it is preferable that the packing part 524 is provided only at a necessary portion and the other parts are made of steel or the like because manufacturing and maintenance are easy.

Inside the rear end of the packing block 520,
A coil spring 522 is housed. One end of the coil spring 522 is in contact with the valve body 500, and the coil spring 522 causes the packing block 520 to
The whole is pressed against the ball valve 510 side to enhance airtightness. As shown in FIG. 6, flanges 532, 536, 538 and a shielding lid 534 are provided outside the packing blocks 520 on the four sides of the valve body 500, and are bolted to the valve body 500. The flange portion 532 is connected to the earth and sand outlet 52.
The flange portion 536 is connected to the earth and sand discharge port 16 of the screw feeder 10. The flange portion 538 is connected to the earth and sand suction / exhaust port 38 of the pressure feeding cylinder 30. The direction of the shielding lid 534 is not connected to any direction and is shielded.

The switching operation of the ball valve 510 will be described with reference to FIG. In the illustrated state, the T-shaped passage space 512
The openings at both ends of the diameter are the sediment intake / exhaust ports 3 of the pressure feeding cylinder 30.
8 communicates with the earth and sand delivery port 52. The remaining openings of the passage space 512 face the shield lid 534 and are therefore shielded. In addition, since the passage space 512 does not open on the soil and sand discharge port 16 side of the screw feeder 10,
It is shielded by a ball valve 510. In this state, the earth and sand can be sent under pressure from the pressure sending cylinder 30 to the earth and sand sending outlet 52.

When the ball valve 510 is rotated clockwise by 90 °, the earth and sand discharge port 16 of the screw feeder 10 and the earth and sand intake and discharge port 38 of the pressure feeding cylinder 30 move the passage space 512.
Are communicated with each other through openings in two directions orthogonal to each other. At this time, since the wall portion of the ball valve 510 faces the earth and sand outlet 52 side, the earth and sand outlet 52 is shielded. If the ball valve 510 can alternately select the above two upper ends,
Basic functions as a sediment pump can be achieved. However, in the structure of the ball valve 510, the earth and sand discharge port 16 and the earth and sand discharge port 5 of the screw feeder 10 may be used as necessary.
It is also possible to configure a state in which the two are communicated with each other to shut off the earth and sand inlet / outlet 38 side of the pressure feeding cylinder 30 or to communicate all of the earth and sand outlet 16 with the earth and sand outlet 52 and the earth / sand inlet 38.

The operation of the earth and sand pumping apparatus having the above structure will be described. The earth and sand dropped and supplied to the hopper 20 are agitated while being sent in the axial direction of the screw feeder 10 as the screw 12 rotates. Due to this stirring, large lumps of earth and sand are broken or crushed. Even if there is uneven distribution of hardness or uneven hardness depending on the location of the sediment, stirring will result in uniform and less uneven sediment. The water content is also made uniform. In order to enhance such an action, muddy water or water may be supplied from the water supply port 18 into the screw feeder 10 together with earth and sand.

The earth and sand are sent from the end of the screw feeder 10 to the cylinder 32 through the earth and sand discharge port 16, the ball valve 50, and the earth and sand suction and discharge port 38 of the pressure feeding cylinder 30. At this time, the ball valve 50 connects the earth and sand discharge port 16 and the earth and sand intake and discharge port 38, and shields the earth and sand outlet 52 side. When the piston 36 of the pressure feeding cylinder 30 is operated in the backward direction (leftward in FIG. 2), the earth and sand is sucked into the cylinder 32 from the earth and sand discharge port 16. Earth and sand
It is sent into the cylinder 32 by the action of both the suction force of the piston 36 and the pushing force of the screw 12 of the screw feeder 10.

After the piston 36 has retracted, the ball valve 50 is switched to connect the earth and sand intake / exhaust port 38 and the earth and sand discharge port 52 to shield the earth and sand discharge port 16 side. When the piston 36 is moved forward in this state, the earth and sand existing in the cylinder 32 is sent out from the earth and sand outlet 52 to a pressure feeding pipe (not shown). By adjusting the advancing speed and pressure of the piston 36, the pressure applied to the earth and sand sent from the earth and sand outlet 52 can be changed. In this step, even if the screw 12 of the screw feeder 10 is operated, the earth and sand cannot be sent to the pressure feeding cylinder 30 side. Therefore, the rotation of the screw 12 may be stopped, but the rotation of the screw 12 may be continued and the earth and sand may be accumulated on the earth and sand discharge port 16 side.

Next, if the ball valve 50 is re-switched and the piston 36 is retracted, as described above,
The step of sucking earth and sand from the screw feeder 10 into the pressure feeding cylinder 30 is started. By repeating such a process in sequence, the earth and sand excavated in the face of the tunnel is sequentially sent out to the pressure feeding pipe and conveyed backward.

In the ball valve 50 of the above embodiment,
Packing blocks 520 and packing parts 5 at a plurality of locations
Since all 24 are the same, if the mounting position of the packing block 520 is periodically changed, uneven wear of the packing part 524 due to the mounting position can be eliminated, and the performance of the packing part 524 and long life can be maintained. Can be realized. Also, if the shielding lid 534 is removed,
Since the packing part 524 of that part can be easily inspected,
From the state of the packing portion 524 at this position, the states of the packing portions 524 at other positions can be predicted to know the replacement timing of the packing portion 524. When the ball valve 510 is operated by inching, the surface condition of the ball valve 510 can be observed and inspected.

Next, the embodiment shown in FIGS. 7 to 9 is a case where the structure of the ball valve 50 is different. Since the basic structure is similar to that of the above-described embodiment, the structure of the different part will be mainly described. Each packing block 5
A gear portion 528 is provided on the outer periphery of the tip of the ball valve 510 side of 20. A drive gear 540 is attached to the outer periphery of the rotary shaft 514 of the ball valve 510. Drive gear 5
A toothed portion 542 that meshes with the gear portion 528 of the packing block 520 is provided on the outer periphery of the lower surface of the 40. FIG.
As shown in FIG.
Since it is provided in four directions centering around 10, the drive gear 540 is provided in all of the packing blocks 520 in the four directions.
The tooth profile portions 542 of the above are engaged with each other.

However, the tooth profile 542 of the drive gear 540 is
It is provided intermittently only in part in the circumferential direction. Specifically, the tooth profile portions 542 are arranged at intervals of 90 ° at three positions in the circumferential direction at intervals of 90 °. Therefore, the packing block 520 can be rotated by the drive gear 540 only when the toothed portion 542 of the drive gear 540 comes to a position where it meshes with the gear portion 528 of each packing block 520. That is, the packing blocks 520 on the four sides are not rotated at the same time, but are in a state of being sequentially rotated and a state of not being rotated.

A wedge-shaped groove 544 narrowing toward one side is provided on the inner peripheral surface of the drive gear 540 which comes into contact with the rotary shaft 514 of the ball valve 510. A roller 548 made of hard steel or the like is housed in the wedge-shaped groove 544, and the roller 548 is pressed by the spring 546 toward the narrower side of the wedge-shaped groove 544. This wedge-shaped groove, roller 548 and spring 5
46 constitutes a ratchet mechanism.

The operation when the ball valve having the above structure is used will be described. When the ball valve 50 is repeatedly opened and closed to pump the earth and sand, the rotating shaft 514 of the ball valve 510 reciprocally rotates. That is, in FIG. 9, the rotating shaft 514 reciprocally rotates in the solid arrow direction and the dotted arrow direction. In this example,
The rotary shaft 514 reciprocally rotates within a range of about 90 degrees.

When the rotary shaft 514 rotates in the direction of the solid arrow, the roller 548 in contact with the rotary shaft 514 moves along the rotary shaft 514 to the narrower side of the wedge-shaped groove 544. The roller 548 is fixed by being sandwiched between the wedge-shaped groove 544 and the outer surface of the rotary shaft 514.
Is transmitted to the drive gear 540 via the roller 548, and the drive gear 540 rotates.

When the rotary shaft 514 rotates in the direction of the dotted arrow, the roller 548 moves to the wider side of the wedge-shaped groove 544, so that the rotational force cannot be transmitted through the roller 548. That is, even if the rotating shaft 514 rotates, the drive gear 540 does not rotate. In this way, when the rotary shaft 514 reciprocally rotates, the drive gear 540 rotates intermittently in only one direction. As described above, the rotating shaft 514 is reciprocally rotated by an angle of 90 degrees by one opening / closing operation of the ball valve 50.
0 also rotates by 90 degrees. In other words, when the ball valve 50 is opened and closed four times, the drive gear 540 becomes 1
Will rotate.

The packing block 520 meshing with the drive gear 540 also intermittently rotates together with the drive gear 540. However, as described above, the packing block 520
Is rotated only when the toothed portion 542 of the drive gear 540 meshes with the gear portion 528, the rotation amount of the packing block 520 is smaller than the rotation amount of the drive gear 540.
Considerably less. Also, the packing blocks 52 on all sides
Since all 0s do not rotate at the same time, the rotational force required to rotate the packing block 520 can be relatively small. The conditions for transmitting the rotation from the drive gear 540 to the packing block 520 are as follows.
The ratio between the pitch diameter of the drive gear 540 and the pitch diameter of the gear portion 528 of the packing block 520, and the drive gear 54
It changes depending on the arrangement interval and the width of the tooth profile portion 542 which is intermittently formed at zero.

When the packing block 520 rotates, the packing block 520 comes into contact with the peripheral surface of the ball valve 510.
The position and posture of the tip surface of the changes. As a result, the tip surface of the packing block 520 is evenly worn, and the life of the packing block 520 or the packing portion 524 attached to the tip thereof can be extended. Since the posture of the packing block 520 is automatically changed while the ball valve 50 is used, it is not necessary to frequently disassemble and remove the shielding lid 534 for the above-mentioned inspection work.

The rotation of the packing block 520 is
Since it does not need to be performed with such a large amount of rotation or frequently, the drive gear 540 and the packing block 5 described above are not required.
By properly setting the meshing condition of 20, the packing block 520 is rotated by an appropriate amount.

[0050]

According to the earth and sand pressure-feeding device of the present invention described above, the screw feeder and the pressure-feeding cylinder are arranged side by side in the horizontal direction, so that work such as laser surveying can be performed in the tunnel. A sufficient space above the tunnel can be secured, and these works can be performed well.

Moreover, since the ball valve as described above is provided as a valve for controlling the flow of earth and sand between the screw feeder and the pressure-feeding cylinder, the airtightness of the valve portion is improved, and the screw feeder moves from the pressure-feeding cylinder to the pressure-feeding cylinder. Since the earth and sand can be reliably and efficiently supplied, even if the screw feeder and the pressure feeding cylinder are arranged in the horizontal direction, there is no fear that the earth and sand conveying performance is deteriorated.

Moreover, since the ball valve is provided, the deformation resistance and durability of the valve portion are increased,
Even if it is applied to hard soil or soil with many stones, it can be used without any problems, and the application range of the sediment pumping device can be further expanded. Further, as the structure of the ball valve, if the gear portion of the cylindrical valve seat, the drive gear, the ratchet mechanism, etc. are provided as described above, the ball valve is automatically opened / closed normally and automatically, By changing the contact position and posture of the cylindrical valve seat and the ball valve, it is possible to prevent uneven wear and deformation of the contact surface. As a result, the durability and life of the packing portion of the tubular valve seat can be extended, the work period for checking and replacing the packing portion can be extended, and the maintenance work can be reduced.
As described above, in the earth and sand pumping device to which the present invention is applied, high airtightness of the valve portion is required, and the valve is often operated continuously for a long period of time while being installed in the tunnel. Improving the workability or reducing the maintenance work can greatly contribute to the efficiency of the entire construction.

[Brief description of the drawings]

FIG. 1 is a plan view of an earth and sand pumping apparatus showing an embodiment of the present invention.

FIG. 2 is a side view showing a part in section.

[Figure 3] Right side enlarged view

FIG. 4 is an enlarged sectional view taken along line AA of FIG.

FIG. 5 is an enlarged sectional view of a ball valve portion.

FIG. 6 is a schematic horizontal sectional view of a ball valve portion.

FIG. 7 is an enlarged sectional view showing another embodiment of the ball valve.

FIG. 8 is a schematic structural diagram in which only the rotating mechanism of the tubular valve seat is taken out.

FIG. 9 is a horizontal sectional view of a main part showing the structure and operation of a drive gear.

[Explanation of symbols]

 10 screw feeder 12 screw 16 earth and sand discharge port 20 hopper 30 pressure feeding cylinder 32 cylinder 36 piston 38 earth and sand suction and discharge port 50 ball valve 52 earth and sand outlet 514 rotary shaft 520 packing block (cylindrical valve seat) 528 gear unit 530 drive gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, former director, Kazumi, 1-9-12, Arata-cho, Hyogo-ku, Kobe (72) Inventor, Osamu Mashita 81-8, Dekakinai-cho, Kashihara-shi, Nara (56) References Special Kai 63-297688 (JP, A)

Claims (2)

(57) [Claims] 1. A device for pumping excavated earth and sand backwards in a tunnel, wherein a screw feeder for sending excavated earth and sands backward while stirring and a screw feeder by reciprocating operation of a piston in a cylinder. The pressure and feed cylinder that sucks the soil and sand sent from the cylinder into the cylinder, pressurizes it with the piston, and sends it out to the rear pressure feed pipe is aligned in the horizontal direction, and the soil and sand discharge port of the screw feeder and the sand and sand suction and discharge port of the pressure feed cylinder A ball valve is provided between the earth and sand outlets connected to the pipe, and the rotation of this ball valve connects the earth and sand outlets with the earth and sand inlets to connect the earth and sand outlets, and the earth and sand outlets and earth and sand outlets. A sediment feeding device characterized in that it can be switched between a state in which it is in communication and the soil and sand discharge port side is blocked. 2. The earth and sand pumping apparatus according to claim 1, wherein the ball valve has a rotatable ball valve having a passage space that opens in a plurality of directions, and a plurality of ball valves that accommodate the ball valve and communicate with the passage space of the ball valve. The valve body has an opening, and each opening of the valve body is provided with a plurality of cylindrical valve seats that are in contact with the peripheral surface of the ball valve and communicate with the passage space.
This tubular valve seat is supported so as to be rotatable about its central axis, and a gear portion is provided on the outer periphery of the tubular valve seat, and a drive gear that meshes with the gear portions of the plurality of tubular valve seats rotates the ball valve. An earth and sand pumping device, which is attached to a shaft so as to be rotatable only in one direction via a ratchet mechanism.