JP2021067034A - Water flow slurry transfer system and water flow slurry transfer method using the same - Google Patents

Abstract

To provide a water flow slurry transfer system and a water flow slurry transfer method using the same, which improve the transfer efficiency of excavated soil and have excellent maintainability.SOLUTION: A water flow slurry transfer system 300A comprises: a circulation pipe 310 having an outward water flow pipe 311 and a return water flow pipe 312 and being configured to form a water flow from the outward water flow pipe 311 to the return water flow pipe 312; a high-pressure pump 320 installed so that high-pressure water can be injected into the outward water flow pipe 311; a piston pump 1 installed so that excavated earth and sand by a mud pressure shield excavator 200 can be injected into the return water flow pipe 312; and a recovery hopper 330 installed so that the excavated earth and sand injected by the piston pump 1 can be recovered from the return water flow pipe 312.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a technique for transferring excavated materials such as earth and sand excavated by a muddy soil pressure shield excavation method or a muddy water shield excavation method.

As a technique for transferring excavated material, for example, in order to transfer excavated soil excavated by the mud pressure shield excavation method to the ground, as described in Patent Document 1, a method of transferring using a belt conveyor, or Patent Document 2 As described in the above, in addition to the method of transferring using a plurality of trolleys (see FIG. 11), the method of pumping excavated soil by piping using a plurality of pumps is used (see FIG. 12).

Japanese Unexamined Patent Publication No. 2014-163129 Japanese Unexamined Patent Publication No. 2015-12103

However, the method of transferring excavated earth and sand using a belt conveyor has a problem that it is necessary to transfer between adjacent belt conveyors, and in particular, when transferring excavated earth and sand excavated by the mud pressure shield excavation method to the ground, it is a shaft. It is difficult to transfer the excavated soil to the ground at the position of.
Further, in the method of transferring the excavated soil from the mud pressure shield excavator 200A into the tunnel T by using the belt conveyor 410 or a plurality of carriages 420 as shown in FIG. 11, the work of loading the excavated earth and sand into each carriage 420 or There is a problem that a lot of manpower is required for the work of unloading excavated soil from each carriage 420 and the work of reciprocating each carriage 420.

On the other hand, as shown in FIG. 12, for example, in the pumping method in which excavated earth and sand are transferred by the pipe 440 using a plurality of piston pumps 430, the discharge pressure of the piston pump is compared with that of the centrifugal slurry pump used in the muddy water shield method. However, in the mud pressure shield excavation method, the pipeline resistance during pumping of excavated earth and sand is larger than that in the mud pressure shield excavation method. Therefore, as the transfer distance becomes longer, it is necessary to increase the number of piston pumps 430 that operate in direct connection with each other, which makes it difficult to manage the operation of the pumps and also increases the maintenance cost of the equipment.

Therefore, the present invention has focused on such a problem, and has described a water flow slurry transfer system that improves the transfer efficiency of excavated materials and is excellent in maintainability, and a water flow slurry transfer method using the same. The challenge is to provide.

In order to solve the above problems, the water flow slurry transfer system according to one aspect of the present invention is a water flow slurry transfer system in which an excavated material is injected into a water stream and transferred as a slurry, and the outbound water flow pipe and the return water flow pipe are used. A circulation pipeline configured to form a water flow from the outward water flow pipe to the return water flow pipe, a high pressure pump installed so as to be able to inject high pressure water into the outward water flow pipe, and the excavated material. It is characterized by including a piston pump that is installed so as to be able to inject into the circulation pipeline, and a recovery hopper that is installed so that the excavated material can be recovered from the return channel water flow pipe.

According to the water flow slurry transfer system according to one aspect of the present invention, the high-pressure water pumped from the high-pressure pump creates a water flow from the outward water flow pipe to the return water flow pipe, and the excavated material is injected into the water flow by the piston pump. Since we have constructed a transfer system that uses water flow to transfer the excavated material, it is possible to transfer the excavated material over a long distance with an extremely simple configuration. Therefore, the transfer efficiency of the excavated material is improved and the maintainability is excellent.

Here, in the water flow slurry transfer system according to one aspect of the present invention, the excavated material is excavated earth and sand excavated by a shield excavation method using a tunnel excavator, and the high pressure pump has a high pressure on the outbound water flow pipe. The piston pump is installed on the ground so that water can be injected, and the piston pump is installed in the vicinity of the tunnel excavator so that the excavated earth and sand can be injected into the circulation pipeline. The return water flow pipe is extended from the vicinity of the tunnel excavator to the recovery hopper on the ground so that the excavated material can be recovered from the vicinity of the tunnel excavator, and the tunnel excavation is carried out from the ground. It is preferable that it is configured to form a water flow that returns the water flow toward the machine side to the ground again.

With such a configuration, high-pressure water pumped from a high-pressure pump installed on the ground creates a water flow from the outbound water flow pipe to the inbound water flow pipe between the ground and the vicinity of the tunnel excavator, and is placed near the tunnel excavator. It is possible to construct a transfer system using the water flow by injecting the excavated earth and sand into the water stream and transferring the excavated earth and sand with the piston pump.
Therefore, the extremely simple configuration enables long-distance transfer of excavated soil from the vicinity of the tunnel excavator to the ground. Since the high-pressure pump for creating a water flow between the ground and the vicinity of the tunnel excavator is installed on the ground, its maintenance is easy, and since this high-pressure pump operates in fresh water, it is used, for example, in the muddy water shield method. Since there is no problem of wear of the wetted parts due to the slurry liquid as in the case of the slurry pump, the maintenance cost can be significantly reduced.

Furthermore, the piston pump placed near the tunnel excavator in order to inject excavated earth and sand into the water flow of the circulation pipeline requires regular replacement of sliding parts, but as a pump that requires maintenance, Only one piston pump is required to inject excavated earth and sand into the water stream.
Therefore, the operation management can be simplified and the excavated earth and sand can be injected into the water stream with a simple structure. Therefore, as compared with the case where the slurry of excavated soil is pumped by the multi-stage centrifugal pump, the maintenance frequency for exchanging parts is less and the operation efficiency can be improved.

Further, in order to solve the above problems, the water flow slurry transfer method according to one aspect of the present invention is a method for transferring earth and sand excavated by the shield method using the water flow slurry transfer system according to one aspect of the present invention. The piston pump is used to inject excavated earth and sand into the circulation pipeline, and the excavated earth and sand is carried on the water flow of the circulation pipeline and transferred to the ground.
According to the water flow slurry transfer method according to one aspect of the present invention, the excavated earth and sand excavated by the shield method is carried on the water flow of the circulation pipeline and transferred to the ground by using the water flow slurry transfer system according to one aspect of the present invention. Therefore, the transfer efficiency of excavated earth and sand can be improved and the maintainability is excellent.

As described above, according to the present invention, the transfer efficiency of the excavated material is improved and the maintainability is excellent.

It is a schematic whole block diagram which shows the 1st Embodiment of the mud pressure shield excavation method using the water flow slurry transfer system which concerns on one aspect of this invention. It is an enlarged view of the main part explaining the mud pressure shield excavator and the water flow slurry transfer system in FIG. 1, and in the example of FIG. 1, a piston pump with a check mechanism is used for injecting excavated earth and sand into a circulation pipeline. ing. FIG. 2 is a schematic view illustrating a piston pump with a check mechanism in FIG. 2, and in the figure, a cross section along an axis is shown. FIG. 3 is a cross-sectional view taken along the line YY in FIG. It is a figure ((a)-(c)) explaining the operation of the check valve mechanism in the piston pump with the check valve mechanism shown in FIG. It is an enlarged view of the main part which shows the 2nd Embodiment of the mud pressure shield excavation method using the water flow slurry transfer system which concerns on one aspect of this invention. A piston pump having no check mechanism and a check valve mechanism are used. It is a figure ((a), (b)) explaining the operation of the check valve mechanism in the example of the 2nd Embodiment shown in FIG. 6, and the figure (a) shows the check valve at the time of switching a swing valve of a piston pump. The poppet valve of the valve mechanism is closed, and FIG. 3B shows the state when excavated earth and sand are injected into the circulation pipeline by a piston pump with the poppet valve of the check valve mechanism open. It is a figure. It is a figure ((a)-(c)) explaining the swing valve switching operation in the piston pump which does not have a check mechanism in the example of the 2nd Embodiment. It is a schematic overall block diagram which shows the 3rd Embodiment by the muddy water shield excavation method using the water flow slurry transfer system which concerns on one aspect of this invention. It is a schematic diagram explaining the conventional example of transferring the earth and sand excavated by the muddy water shield excavation method to the ground by using a plurality of pumps. It is a schematic diagram explaining the conventional example of transporting the earth and sand excavated by the mud pressure shield excavation method to the ground using a plurality of carriages. It is a schematic diagram explaining the conventional example of transferring the earth and sand excavated by the mud pressure shield excavation method to the ground by using a plurality of piston pumps.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension are different from the actual ones, and there are parts where the relationship and ratio of the dimensions are different between the drawings.
In addition, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, and arrangement of constituent parts. Etc. are not specified in the following embodiments.

First, the water flow slurry transfer system of the first embodiment will be described.
In this embodiment, as shown in FIG. 1, the water flow slurry transfer system 300A according to the present invention is applied to a mud pressure shield excavation method for excavating a tunnel T using a mud pressure shield excavator (tunnel excavator) 200A. This is an example.
As shown in the figure, the water flow slurry transfer system 300A of the present embodiment has one piston pump 1, a circulation pipe 310 having an outward water flow pipe 311 and a return water flow pipe 312, and a high pressure installed on the ground G. It includes a pump 320 and a recovery hopper 330 installed on the ground G.

The high-pressure pump 320 is installed so that the fresh water stored in the fresh water tank 340 can be injected into the outbound water flow pipe 311 as high-pressure water. The recovery hopper 330 is installed so that the excavated material (in this example, the excavated soil excavated by the mud pressure shield excavation method using the mud pressure shield excavator 200A) can be recovered from the return channel water flow pipe 312.
The circulation pipe 310 is piped from the ground G through the shaft V along the extending direction of the underground tunnel T so as to form a circulation water flow from the outward water flow pipe 311 to the return water flow pipe 312. The piston pump 1 is installed in the vicinity of the mud pressure shield excavator 200A so that the excavated material can be injected into the circulation pipe 310.

The range of the outbound water flow pipe 311 and the inbound water flow pipe 312 can be appropriately set, but in the present embodiment, the outbound water flow pipe 311 is located on the upstream side of the U-shaped folded portion in the vicinity of the mud pressure shield excavator 200A, and the U The return channel water flow pipe 312 is located downstream of the folded-back portion. Then, in this example, the piston pump 1 is installed in the vicinity of the mud pressure shield excavator 200A so that the excavated material can be injected into the return water flow pipe 312.
Further, the above-ground G is provided with a mud-making soil material tank 240 and a mud-making soil material pumping pump 250 in order to supply the mud-making material to the mud-soil pressure shield excavator 200A, and the mud-making soil material pumping pipe 260 is provided from the above-ground G. It is piped through the shaft V to the underground mud pressure shield excavator 200A.

As shown in FIG. 2, in the mud pressure shield excavator 200A, the cutter head 213 having a large number of cutter bits attached to the front surface of the bulkhead 212 of the cylindrical excavator main body 210 is passed through the cutter drum 215. It is mounted freely. A fishtail cutter 219 is attached to the center of the cutter head 213.
A drive motor is built in the gear portion 216 of the cutter drum 215, and the drive motor is operated to rotationally drive the cutter head 213. Further, a rotary joint 224 is assembled in the central portion of the bulkhead 212, and the mud-producing material is injected through the rotary joint 224 from the mud-producing soil material pumping pipe 260.

At the inner peripheral portion of the excavator main body 210, propulsion jacks 229 that expand and contract with respect to the existing (assembled) segment S constructed (assembled) on the inner peripheral surface of the tunnel as a lining member are separated by a predetermined interval in the circumferential direction. A plurality of them are arranged.
The skin plate 230 of the excavator main body 210 is fitted on the outer periphery of the existing segment S. Further, at the rear part of the excavator main body 210, an elector (not shown) for assembling the segment S and a stand are assembled, and an adjuster for holding the assembled segment S in a perfect circle is mounted on the stand.

Inside the excavator main body 210, a screw conveyor 225 is arranged so as to be inclined backward, and the screw conveyor 225 makes it possible to discharge the earth and sand excavated by the cutter head 213 toward the rear of the tunnel. The screw conveyor 225 has a spiral screw blade 225c coaxially mounted inside the cylindrical tube 225a so as to be rotatable by a rear drive motor 225b.

The front end portion (outlet) of the screw conveyor 225 penetrates the lower part of the bulkhead 212 and communicates with the chamber chamber 226 defined by the cutter head 213 and the bulkhead 212. The discharge port 225d provided at the rear lower portion of the screw conveyor 225 is arranged facing the upper portion of the hopper 9 of the piston pump 1 constituting the water flow slurry transfer system 300A, which is arranged in the longitudinal direction in the tunnel T.

As shown in the enlarged view of FIG. 3, the piston pump 1 of the first embodiment includes a hopper 9 that opens at the top, and a swing pipe 2 that is bent and formed in a substantially S shape is swayed inside the hopper 9. It is movably housed. The swing tube 2 in the hopper 9 is supported so that its base end portion 2b is rotatably supported at a position below the front wall 1f of the hopper 9.
The base end portion 2b of the swing pipe 2 is provided with a coupling 5 connected to the discharge pipe 6 to the return water flow pipe 312 shown in FIG. The discharge pipe 6 shown in FIG. 2 is connected to the coupling 5, and the base end portion 2b of the swing pipe 2 is arranged so as to communicate with the discharge pipe 6.

One end of the swing tube shaft 10 whose axis is horizontal is fixed to the upper portion of the intermediate portion 2 m of the swing tube 2. One end of the swing tube shaft 10 is rotatably supported by the back wall 1b of the hopper 9. The other end of the swing tube shaft 10 extends to the outside of the back wall 1b of the hopper 9, and the switching lever 11 is fixed thereto. The rotation center CL1 of the swing tube shaft 10 and the rotation center CL2 of the base end portion 2b of the swing tube 2 are on one horizontal swing axis CL.
At the lower part of the back wall 1b of the hopper 9, a pair of spectacle plates 8 having suction / discharge ports 1L and 1R on the left and right are provided. The spectacle plate 8 is arranged at a portion where the tip portion 2t of the swing tube 2 is in sliding contact. The spectacle plate 8 is replaceably attached from the back side of the hopper 9.

The tip portion 2t of the swing tube 2 slides in a state of being in pressure contact with the spectacle plate 8. Therefore, a replaceable wear plate 12 is attached to the tip portion 2t of the swing tube 2. In this embodiment, a wear-resistant material is used for the spectacle plate 8 and the wear plate 12.
On the back of the hopper 9, a pair of pump cylinders 4L and 4R having one ends opened at positions facing the pair of suction and discharge ports 1L and 1R of the spectacle plate 8 make their axes parallel to the swing axis CL. Is installed.

The pair of pump cylinders 4L and 4R each have a transport piston 7 in each pump cylinder 4L and 4R. Each of the transport pistons 7 is hydraulically driven to reciprocate alternately by a pair of drive cylinders 15L and 15R shown in FIG. Each pump cylinder 4L and 4R sucks the excavated material in the hopper 9 when the corresponding suction and discharge ports 1L and 1R do not communicate with the rocking pipe 2, and sucks the excavated material when communicating with the rocking pipe 2. It is driven so as to discharge toward the return water flow pipe 312.

As shown in FIG. 4, a pair of switching cylinders 3L and 3R are attached as actuators between the switching lever 11 and the hopper 9. The pair of switching cylinders 3L and 3R are designed so that when one of the switching cylinders 3L and 3R expands, the other contracts.
Corresponding to the expansion and contraction of the pair of switching cylinders 3L and 3R, the swing tube shaft 10 rotates around the swing axis CL at a predetermined timing, and the swing tube 2 swings left and right within a predetermined rotation range. Cylinder. As a result, the tip portion 2t of the swing pipe 2 shown in FIG. 3 alternately moves to a position facing any of the left and right suction / discharge ports 1L and 1R.

Here, the piston pump 1 of the present embodiment includes a backflow prevention mechanism.
In the piston pump 1 of the present embodiment, as shown in FIG. 3, a cylindrical wear ring is provided at a position coaxial with the central opening 13 of the wear plate 12 at the tip 2t of the swing tube 2. ) 20 is installed.
Then, as shown in FIG. 5B, the backflow prevention mechanism of the present embodiment is a wear ring 20 in which the distance between the left and right suction / discharge ports 1L and 1R of the spectacle plate 8 is rotated integrally with the wear plate 12. The width of the opening is 20 m or more.

The wear plate 12 has seal portions 14L and 14R at both left and right ends of the opening 13 (see FIG. 3) of the wear plate 12. The left and right seal portions 14L and 14R are provided so as to rotate while the surface facing the spectacle plate 8 and itself are in sliding contact with each other.
The seal portions 14L and 14R of the present embodiment are provided in the rotation direction of the swing tube 2 so as to have a width equal to or larger than the opening width of the pair of suction / discharge ports 1L and 1R formed on the spectacle plate 8. In this embodiment, the pair of suction / discharge ports 1L and 1R have a circular opening shape, and the opening diameters of the pair of suction / discharge ports 1L and 1R are the same.
As shown in FIG. 3, the wear ring 20 of the present embodiment is fitted with an O-ring 30 on the inner peripheral surface of the tip end portion 2t of the swing tube 2 with an O-ring 30 interposed therebetween. ing. As a result, the wear ring 20 of the swing tube 2 can slide in the direction of the swing axis CL from the inner peripheral surface of the tip portion 2t.

Further, the rear end surface of the wear ring 20 is attached so as to be in sliding contact with the facing surface of the spectacle plate 8. The opening shape of the inner diameter of the wear ring 20 is circular, and the opening diameter thereof is the same as the opening diameter of the pair of suction / discharge ports 1L and 1R. The wear ring 20 of the present embodiment exhibits a mechanical sealing function utilizing the internal pressure generated by the water flow from the coupling 5 side.
That is, in this wear ring 20, when the internal pressure of the swing pipe 2 rises due to the water flow from the coupling 5 side at the non-communication position, the intervening end surface of the O-ring 30 becomes the pressure receiving surface, and the wear ring 20 becomes the axial direction. It is pressed toward the back side. As a result, the rear end surface of the wear ring 20 has a sealing structure in which the rear end surface is pressed toward the facing surface of the spectacle plate 8, and the sealing force becomes stronger as the internal pressure of the swing tube 2 increases.

Then, the wear plate 12 of the present embodiment slides on the outer peripheral surface of the tip portion 2t of the swing tube 2 with respect to the outer peripheral surface of the tip portion 2t and the outer peripheral surface of the wear ring 20 in the direction of the swing axis CL. It is in-row-matched as much as possible, and is further mounted so as to be in sliding contact with the facing surface of the spectacle plate 8.
As described above, in the piston pump 1 of the present embodiment, the fitting portions of the wear ring 20 and the wear plate 12 with the tip portion 2t of the swing pipe 2 are in an in-row relationship, respectively, and swing when assembled. At the intermediate position of the stroke (position in FIG. 5B), the parts are assembled by fitting each component in the axial direction in the order shown in FIG. 1 from the transfer piston 7 side.

In the piston pump 1 of the present embodiment, as shown in FIGS. 3 and 4, the wear plate 12 has a raceway board 60s on the outer peripheral side of the wear plate 12 over the entire swing range of the swing pipe 2. A plurality of rolling elements 61 and 62 mounted on the set plate 40 and the set plate 40 are configured to be supported from the front and rear of the swing axis CL, and the inner peripheral side of the wear plate 12 is the track board 60u and the set plate 40. A plurality of rolling elements 63 and 64 mounted on the shaft are configured to be supported from the front and rear of the swing axis CL.
As a result, when the wear plate 12 swings together with the swing tube 2, the seal portions 14L and 14R on both sides of the wear plate 12 move up and down even at positions that match the left and right suction and discharge ports 1L and 1R of the spectacle plate 8. It is supported via a plurality of rolling elements 61, 62 and a plurality of rolling elements 63, 64 arranged in.

Next, the operation and the effect of the water flow slurry transfer system 300A of the first embodiment will be described.
When excavating the tunnel T by the mud pressure shield excavator 200A, first, the drive motor is operated to rotate the cutter head 213 at the initial position where all the propulsion jacks 229 are contracted. Next, the propulsion jack 229 is extended from the initial position, and the skin plate 230 of the excavator main body 210 is propelled by receiving the propulsion reaction force in the existing segment S.

Due to this propulsion, a large number of cutter bits mounted on the cutter head 213 excavate the ground in front. The excavated earth and sand are transferred from the chamber chamber 226 to the recovery hopper 330 of the water flow slurry transfer system 300A via the screw conveyor 225 and discharged to the outside.
Next, with the cutter head 213 stopped turning, the propulsion jack 229 is partially contracted in sequence, the segment S is assembled by an elector and a segment adjuster (not shown), and the segment S is held in a perfect circle. After that, the above-mentioned steps are repeated to excavate and form a tunnel T having a predetermined length.

Here, in the water flow slurry transfer system 300A of the first embodiment, a circulating water flow is created by high-pressure water pumped from the high-pressure pump 320 to the circulation pipe 310, and excavated earth and sand are circulated from the return water flow pipe 312 by the piston pump 1. Since we have constructed a transfer system that uses a circulating water flow to inject the excavated sediment into the ground and transfer it to the ground as a slurry, it is possible to transfer the excavated sediment over a long distance with an extremely simple configuration. Therefore, the transfer efficiency of excavated soil is improved and the maintainability is excellent.

In particular, in the piston pump 1 of the first embodiment, when the excavated earth and sand in the hopper 9 is pumped, the rocking pipe 2 is swung in the left-right direction by driving the switching cylinders 3L and 3R for rocking, and 2 The transport pistons 7 in the pump cylinders 4L and 4R of the book are driven to move forward and backward alternately.
As a result, the excavated earth and sand in the hopper 9 is sucked into the corresponding pump cylinder 4L or 4R from one suction / discharge port 1L or 1R. At this time, in the other suction / discharge port 1R or 1L, the corresponding pump cylinder 4R or 4L communicates with the swing pipe 2, and the excavated earth and sand sucked into the inside communicates with the transport piston 7 of the corresponding pump cylinder 4R or 4L. Is pumped and discharged from the swing pipe 2 to the discharge pipe 6.

At the communication position with the discharge pipe 6, when the excavated earth and sand are pushed out from the transport piston 7 side, the excavated earth and sand are pushed out with a force larger than the water flow pressure (for example, 8 MPa) from the coupling 5 side acting in the opposite direction in the rocking pipe 2. Can be done.
Therefore, according to the piston pump 1 of the present embodiment, the switching cylinders 3L and 3R are shaken by driving the switching cylinders 3L and 3R with a predetermined timing in accordance with the forward / backward movement of the transport piston 7 in the two pump cylinders 4L and 4R. The moving pipe 2 can be swung left and right, and the excavated earth and sand in the hopper 9 can be continuously discharged from the swing pipe 2 through the discharge pipe 6 into the return water flow pipe 312.

Here, for example, when the slurry of excavated soil is pumped by a multi-stage centrifugal pump, the concentration of the slurry that can be pumped is 15 vol% or less, and for safety, it is limited to 10 vol% or less. With the transfer system 300A, the slurry concentration that can be pumped by using the piston pump 1 can be transferred even if the slurry has a high concentration of 15 vol% or more, which is excellent in improving the operating efficiency.

Further, according to the present embodiment, in order to inject excavated earth and sand into the circulating water flow of the circulation pipeline 310, the piston pump 1 arranged in the vicinity of the mud pressure shield excavator 200A is periodically replaced with sliding parts. However, the pump that requires maintenance requires only one piston pump 1 that injects excavated soil into the circulating water flow.
Therefore, it is possible to simplify the operation management and to inject the excavated earth and sand into the circulating water flow with a simple structure. Therefore, as compared with the case where the slurry of excavated soil is pumped by the multi-stage centrifugal pump, the maintenance frequency for exchanging parts is less and the operation efficiency can be improved.

Then, according to the piston pump 1 of the first embodiment, since the backflow prevention mechanism using the wear plate 12 is provided, the swing pipe 2 is swung and the tip portion 2t thereof is moved from one suction / discharge port 1L to the other. From the suction / discharge port 1R (wear plate 12 from the position of FIG. 5 (a) to the position of FIG. 5 (c)), or from the other suction / discharge port 1R to one suction / discharge port 1L (wear plate 12 is shown in the figure). In the process of switching from the position 5 (c) to the position shown in FIG. 5 (a), even if the position in the middle shown in FIG. 5 (b) is reached, the left and right suction / discharge ports 1L and 1R communicate with each other. Backflow from the circulation line 310 can be reliably prevented without occurring.

Further, according to the piston pump 1 of the first embodiment, since the wear plate 12 and the wear ring 20 have a separated structure, the rotation operation of the wear plate 12 is smoothed, and the higher the pumping pressure is, the more the mechanical seal is provided. The wear ring 20 having a function can be tightly adhered to the spectacle plate 8 to further enhance the sealing force.

That is, according to the piston pump 1 of the first embodiment, the wear ring 20 provided on the inner peripheral surface of the tip portion 2t of the rocking pipe 2 functions as a mechanical seal, and the higher the pumping pressure, the more the spectacle plate 8 The wear ring 20 can be strongly adhered to the surface facing the spectacle plate to enhance the sealing force, and the wear plate 12 provided separately provides a backflow prevention function, while the suction and discharge ports 1L and 1R on the left and right sides of the spectacle plate. The swing tube 2 can be reliably switched to the communication position with.
Therefore, as compared with the case where the wear plate 12 and the wear ring 20 are integrated, for example, even at the time of high-pressure pumping, the sealing force is enhanced, the backflow prevention function is performed, and the force for swinging the swing tube 2 is increased. It can be said that it is extremely excellent as a configuration in which the swing tube 2 is made smaller and the swing tube 2 is reliably switched to the communication position with the suction / discharge ports 1L and 1R of the left and right eyeglass plates.

As described above, according to the water flow slurry transfer system 300A of the present embodiment and the water flow slurry transfer method using the same, the transfer efficiency of excavated earth and sand by the mud pressure shield excavator 200A is improved and the maintainability of the transfer system is improved. Are better.
The water flow slurry transfer system according to the present invention and the water flow slurry transfer method using the same are not limited to the above embodiments, and of course, various modifications can be made without departing from the gist of the present invention. Is.
For example, in the first embodiment, an example using the piston pump 1 having a backflow prevention function has been shown, but the present invention is not limited to this, and for example, as in the second embodiment below, the piston pump 1 does not have a backflow prevention function. A water flow slurry transfer system may be constructed by a piston pump.

Hereinafter, the water flow slurry transfer system of the second embodiment will be described.
As shown in FIG. 6, in the water flow slurry transfer system 300B of the second embodiment, the piston pump 100 does not have a backflow prevention function, and instead of this, a check valve is used to ensure the backflow prevention function. It differs from the water flow slurry transfer system of the first embodiment in that the mechanism 140 is provided.
Since the configurations other than the piston pump 100 and the check valve mechanism 140 are the same as those of the first embodiment, the differences will be described below, and the same or corresponding configurations as those of the first embodiment are designated by the same reference numerals. The description thereof will be omitted as appropriate.

As shown in FIG. 7, in the piston pump 100 of the second embodiment, a spectacle plate 108 having a pair of left and right suction / discharge ports 101L and 101R is provided on the back wall 101b of the hopper 901 in which the object to be transported is housed. .. A pair of left and right pump cylinders 104L and 104R are provided on the backs of the suction and discharge ports 101L and 101R.
Inside the hopper 901, a swing pipe 102 is provided so that the tip portion can be alternately switched and moved to a communication position facing the left and right suction / discharge ports 101L and 101R. The swing tube 102 can swing around the swing axis CL of the swing tube shaft 110 by the swing drive of the switching lever 111.

The piston pump 100 of the second embodiment does not have a backflow prevention function in the pump itself, and has a structure in which a swing pipe 102 is used for switching between discharge and suction. At the time of switching between suction and suction, while switching the position of the communication port 102t of the swing pipe 102 from the discharge suction port 101L on the left side of the figure to the discharge suction port 101R on the right side, as shown in FIG. A moment of communication with the suction side occurs.

On the other hand, in the water flow slurry transfer system 300B of the second embodiment, as shown in FIG. 7, the check valve mechanism 140 faces the opening of the discharge pipe 106 for injecting excavated earth and sand into the return water flow pipe 312. Are arranged. The check valve mechanism 140 has a hydraulic cylinder 141 and a poppet valve 142 that moves forward and backward by driving the hydraulic cylinder 141. A disk-shaped valve disk 142d is provided at the tip of the poppet valve 142, and an annular valve ring 143 is fitted around the opening of the discharge pipe 106 at a position facing the periphery of the valve disk 142d. There is.

The poppet valve 142 closes the opening of the discharge pipe 106 at the forward position shown in FIG. (A), and fully opens the opening of the discharge pipe 106 at the backward position shown in FIG. It is configured so that it can be retracted to a position that does not obstruct the flow path of the water flow pipe 312. As a result, even in the piston pump 100 of the water flow slurry transfer system 300B of the second embodiment, backflow can be prevented and the same effect as that of the first embodiment can be obtained.

Since the check valve mechanism 140 is provided on the return path water flow pipe 312 side of the piston pump 100 of the second embodiment, the seals on both sides of the wear plate 12 like the piston pump 1 of the first embodiment are sealed. It is possible to eliminate the configuration in which the portions 14L and 14R are vertically arranged and supported via the plurality of rolling elements 61 and 62 and the plurality of rolling elements 63 and 64.
Further, as for the check valve mechanism 140 provided on the side of the return water flow pipe 312, the poppet valve 142 is constantly exposed to the circulating water flow of the circulation pipe 310, so that the gravel of the excavated earth and sand is the poppet valve 142 and its own. There is no problem that the drive part is clogged.
Further, in the first to second embodiments, an example of improving the transfer efficiency of excavated soil by the mud pressure shield excavator 200A has been shown, but the present invention is not limited to this, and for example, the transfer of excavated soil by the muddy water shield method is used. The present invention can be applied to improve efficiency.

Hereinafter, a third embodiment, which is an example in which the present invention is adopted as a transfer system for excavated soil by the muddy water shield method, will be described. The same or corresponding configurations as those in the first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted as appropriate. Further, since the muddy water shield method itself is a known method, the description thereof will be omitted.

As shown in FIG. 9, in the water flow slurry transfer system 300C of the third embodiment, in order to perform the muddy water shield method, the above-ground G is equipped with the mud-making soil material-related equipment 240 and 250 of the first to second embodiments. Instead of 260, a muddy water treatment plant 290, a muddy water adjusting tank 291 and a muddy water supply pump 292 are provided, and a mud feed pipe 270 connected to the discharge side of the muddy water supply pump 292 is a muddy water shield excavator (tunnel excavator). It is piped so that the muddy water required for 200B can be supplied.

The treatment tank of the muddy water treatment plant 290 is configured so that the slurry of excavated soil is put into the treatment tank from the discharge port of the return water flow pipe 312. The excavated earth and sand classified in the muddy water treatment plant 290 is collected in the recovery hopper 330 via the recovery conveyor device 293.
Further, the muddy water classified in the muddy water treatment plant 290 is sent to the muddy water supply pump 292 via the muddy water adjustment tank 291, and is driven by the muddy water supply pump 292 from the mud feed pipe 270 toward the muddy water shield excavator 200B. It is supposed to be supplied.

In the muddy water shield excavator 200B, a mud drain pipe 280 is connected instead of the screw conveyor 225 in the first or second embodiment. A piston pump 1 is arranged in the vicinity of the muddy water shield excavator 200B in order to inject the excavated earth and sand slurry into the circulating water flow of the circulation pipeline 310. The mud drain pipe 280 is piped so as to supply the slurry in which the excavated earth and sand excavated by the muddy water shield excavator 200B and the muddy water are mixed to the hopper 9 of the piston pump 1.

According to the water flow slurry transfer system 300C of the third embodiment, the excavated earth and sand excavated by the muddy water shield method is transferred to the ground, so that the transfer efficiency of the excavated earth and sand can be improved and the maintainability is excellent.
Further, similarly to the first to second embodiments, in the water flow slurry transfer system 300C of the third embodiment, the piston pump 1 arranged in the vicinity of the muddy water shield excavator 200B requires periodic replacement of sliding parts. However, as a pump that requires maintenance, only one piston pump that injects excavated earth and sand into the circulating water flow is sufficient.

Therefore, the operation management can be simplified, and the slurry of excavated soil excavated by the muddy water shield excavator 200B can be injected into the circulating water flow of the circulation pipe 310 with a simple configuration. Therefore, as compared with the case where the excavated earth and sand slurry is sequentially pumped through the pipeline 460 by a plurality of multi-stage centrifugal pumps 450 as shown in FIG. 10, the maintenance frequency for exchanging parts is less and the operation efficiency is improved. Can be improved.

1 Piston pump 1L Suction / discharge port 1R Suction / discharge port 1b Back wall 1f Front wall 2 Swing pipe 2b Base end 2m Intermediate part 2t Tip 3L, 3R Switching cylinder 4L Pump cylinder 4R Pump cylinder 5 Coupling 6 Discharge pipe 7 Conveyance Piston 8 Glass plate 9 Hopper 10 Swing pipe shaft 11 Switching lever 12 Wear plate 13 Opening 14L, 14R Seal 20 Wearing 20m Opening 30 O ring 40 Set plate 60 Track board 100 Piston pump 101L Discharge suction port 101R Discharge suction Port 101b Back wall 102 Swing pipe 102t Communication port 104L, 104R Pump cylinder 106 Discharge pipe 108 Glass plate 109 Hopper 110 Swing pipe shaft 111 Switching lever 140 Check valve mechanism 141 Hydraulic cylinder 142 Poppet valve 200A Mud pressure shield excavator ( Tunnel excavator)
200B muddy water shield excavator (tunnel excavator)
210 Excavator body 212 Bulkhead 213 Cutter head 215 Cutter drum 216 Gear part 219 Fishtail cutter 224 Rotary joint 225 Screw conveyor 225a Cylindrical pipe 225b Drive motor 225c Screw wing 226 Chamber chamber 229 Propulsion jack 230 Skin plate 240 Cob tank 250 Soil soil material pump 260 Soil mud material pumping pipe 270 Mud pipe 280 Mud drainage pipe 290 Mud water treatment plant 291 Muddy water adjustment tank 292 Muddy water supply pump 300A, 300B, 300C Water flow slurry transfer system 310 Circulation pipe 311 Outward water flow pipe 312 Return route Water flow pipe 320 High pressure pump 330 Recovery hopper 340 Fresh water tank CL Swing axis CL1 Rotation center CL2 Rotation center S Segment G Ground T Tunnel V Vertical shaft

Claims (5)

A water flow slurry transfer system that injects excavated material into a water stream and transfers it as a slurry.
A circulation pipeline having an outward water flow pipe and a return water flow pipe and being configured to form a water flow from the outward water flow pipe to the return water flow pipe.
A high-pressure pump installed so that high-pressure water can be injected into the outbound water flow pipe,
A piston pump installed so that the excavated material can be injected into the circulation pipeline,
A recovery hopper installed so that the excavated material can be recovered from the return water flow pipe,
A water flow slurry transfer system characterized by being equipped with. The excavated material is excavated earth and sand excavated by a shield excavation method using a tunnel excavator.
The high-pressure pump is installed on the ground so that high-pressure water can be injected into the outbound water flow pipe.
The piston pump is installed in the vicinity of the tunnel excavator so that the excavated earth and sand can be injected into the circulation pipeline.
In the circulation pipeline, the outward water flow pipe extends from the ground to the vicinity of the tunnel excavator, and the return water flow pipe extends the excavated material from the vicinity of the tunnel excavator to the recovery hopper on the ground. The water flow slurry transfer system according to claim 1, which is extended so as to be recoverable and is configured to form a water flow that returns the water flow from the ground toward the tunnel excavator side to the ground again. The piston pump has a discharge pipe connected to the return water flow pipe so that the excavated object in the piston pump can be injected into the return water flow pipe, and a backflow that prevents backflow of the excavated object from the discharge pipe side. The water flow slurry transfer system according to claim 1 or 2, further comprising a prevention mechanism. The piston pump has a discharge pipe connected to the return water flow pipe so that the excavated material in the piston pump can be injected into the return water flow pipe.
Claim 1 is provided with a check valve mechanism for opening and closing the location where the discharge pipe is connected at a position facing the location where the discharge pipe is connected to the return pipe. Or the water flow slurry transfer system according to 2. A method of transferring excavated earth and sand excavated by the shield excavation method using the water flow slurry transfer system according to any one of claims 2 to 4.
A water flow slurry transfer method characterized in that excavated earth and sand are injected into the circulation pipeline by the piston pump, and the excavated earth and sand is carried on the water flow of the circulation pipeline and transferred to the ground.

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