JP7323420B2 - Water stream slurry transfer system and water stream slurry transfer method using the same - Google Patents

Description

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

Techniques for transporting excavated material include, for example, a method of transporting excavated earth and sand excavated by a mud pressure shield excavation method to the ground, as described in Patent Document 1, a method of transporting using a belt conveyor, and Patent Document 2. , a method of transporting excavated soil using a plurality of trolleys (see FIG. 11) and a method of pumping excavated earth and sand through pipes using a plurality of pumps (see FIG. 12) are used.

JP 2014-163129 A JP 2015-121034 A

However, the method of transferring excavated earth and sand using a belt conveyor has the problem of requiring a transfer between adjacent belt conveyors. It is difficult to transfer the excavated earth and sand to the ground at the position of
Further, in the method of transferring the excavated earth and sand from the mud pressure shield excavator 200A in the tunnel T using a belt conveyor 410 and a plurality of trucks 420 as shown in FIG. , the work of unloading excavated earth and sand from each truck 420, the work of reciprocating each truck 420, and the like require a lot of manpower.

On the other hand, as shown in FIG. 12, for example, in the pumping method of transferring the excavated earth and sand through pipes 440 using a plurality of piston pumps 430, the discharge pressure of the piston pump is lower than that of the centrifugal slurry pump used in the mud shield construction method. However, in the mud pressure shield excavation method, the pipeline resistance during pumping of the excavated soil is greater than the pipeline resistance during pumping of the slurry liquid in the mud shield method. Therefore, as the transfer distance becomes longer, the number of piston pumps 430 that operate in direct interlocking operation needs to be increased, which makes it difficult to manage the operation of the pumps and increases the maintenance costs of the equipment.

Therefore, the present invention has been made by paying attention to such problems, and provides a water flow slurry transfer system and a water flow slurry transfer method using the same, which improve the transfer efficiency of excavated objects and are excellent in maintainability. The task is to provide

In order to solve the above-described problems, a water flow slurry transfer system according to one aspect of the present invention is a water flow slurry transfer system that injects excavated material into a water flow and transfers it as a slurry, and comprises an outward water flow pipe and a return water flow pipe. a circulation pipe configured to form a water flow from the outward water flow pipe to the homeward water flow pipe; a high-pressure pump installed so as to inject high-pressure water into the outward water flow pipe; It is characterized by comprising a piston pump installed in the circulation pipeline so as to be able to inject, and a recovery hopper installed so as to be able to recover the excavated material from the return water flow pipe.

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

Here, in the water stream 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 supplies high pressure to the forward water flow pipe. The piston pump is installed on the ground so as to be able to inject water, the piston pump is installed in the vicinity of the tunnel excavator so as to be able to inject the excavated earth and sand into the circulation pipeline, and the circulation pipeline is arranged such that the outbound water flow pipe is located on the ground. from the tunnel excavator to the vicinity of the tunnel excavator, and 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, and the tunnel excavation from the ground. It is preferable to form a water flow that returns the water flow toward the aircraft side to the ground.

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 a water flow in which the excavated earth and sand is transferred by injecting the excavated earth and sand into the water flow with a piston pump.
Therefore, the excavated soil can be transported over a long distance from the vicinity of the tunnel excavator to the ground with an extremely simple configuration. 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, it is easy to maintain. Maintenance costs can be greatly reduced because there is no problem of wear of wetted parts due to the slurry liquid, unlike the slurry pumps used in conventional pumps.

Furthermore, the piston pump installed near the tunnel excavator in order to inject the excavated earth and sand into the water flow of the circulation pipeline requires periodic replacement of the sliding parts, but as a pump that requires maintenance, Only one piston pump is required to inject the excavated soil into the water stream.
Therefore, it is possible to simplify operation management and to inject excavated earth and sand into the water stream with a simple configuration. Therefore, compared with the case where slurry of excavated earth and sand is pumped by a multi-stage centrifugal pump, maintenance frequency such as replacement of parts can be reduced and operation efficiency can be improved.

Further, in order to solve the above problems, a water stream slurry transfer method according to one aspect of the present invention is a method for transferring earth and sand excavated by a shield construction method using a water stream slurry transfer system according to one aspect of the present invention. and the piston pump is used to inject excavated earth and sand into the circulation pipeline, and the excavated earth and sand are transported to the ground along with the water flow of the circulation pipeline.
According to the water stream slurry transfer method according to one aspect of the present invention, the excavated earth and sand excavated by the shield construction method is carried on the water stream of the circulation pipeline and transferred to the ground using the water stream slurry transfer system according to one aspect of the present invention. Therefore, it is possible to improve the transfer efficiency of the excavated earth and sand, and it is excellent in maintainability.

As described above, according to the present invention, it is possible to improve the transfer efficiency of the excavated material and to improve the maintainability.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic overall configuration diagram showing a first embodiment of a mud pressure shield excavation method using a water flow slurry transfer system according to one aspect of the present invention; FIG. 2 is an enlarged view of the main parts for explaining the mud pressure shield excavator and the water flow slurry transfer system in FIG. ing. It is a schematic diagram explaining the piston pump with a check mechanism in FIG. 2, and the cross section along an axis is shown in the same figure. 4 is a cross-sectional view taken along line YY in FIG. 3; FIG. 4A to 4C are diagrams ((a) to (c)) for explaining the operation of the non-return mechanism in the piston pump with the non-return mechanism shown in FIG. 3; FIG. 4 is an enlarged view of a main part showing a second embodiment of a mud pressure shield excavation method using a water flow slurry transfer system according to one aspect of the present invention. A piston pump without a check mechanism and a check valve mechanism are used. 7A and 7B are diagrams ((a) and (b)) for explaining the operation of the check valve mechanism in the example of the second embodiment shown in FIG. 6, and FIG. The poppet valve of the valve mechanism is shown in a closed state, and FIG. 4(b) shows a state in which the excavated earth and sand are injected into the circulation pipeline by the piston pump with the poppet valve of the check valve mechanism open. It is a diagram. FIG. 10 is diagrams ((a) to (c)) for explaining a swing valve switching operation in a piston pump that does not have a non-return mechanism in the example of the second embodiment; FIG. 5 is a schematic overall configuration diagram showing a third embodiment of a mud shield excavation method using a water flow slurry transfer system according to one aspect of the present invention. It is a schematic diagram explaining the conventional example which transfers the earth and sand excavated by the mud shield excavation method to the ground using a plurality of pumps. FIG. 2 is a schematic diagram illustrating a conventional example of transporting earth and sand excavated by the mud pressure shield excavation method to the ground using a plurality of carts. FIG. 2 is a schematic diagram illustrating a conventional example of transporting earth and sand excavated by the mud pressure shield excavation method to the ground using a plurality of piston pumps.

An embodiment of the present invention will be described below with appropriate reference to the drawings. Note that the drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the planar dimensions are different from the actual ones, and the drawings include portions where the relationship and ratio of the dimensions are different from each other.
Further, the embodiments shown below are examples of devices and methods for embodying the technical idea of the present invention. etc. are not specified in the following embodiments.

First, the water stream slurry transfer system of the first embodiment will be described.
In this embodiment, as shown in FIG. 1, a 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. For example.
As shown in the figure, the water flow slurry transfer system 300A of this embodiment includes one piston pump 1, a circulation pipe line 310 having an outward flow pipe 311 and a return flow pipe 312, and a high pressure A pump 320 and a recovery hopper 330 installed on the ground G are provided.

The high-pressure pump 320 is installed so as to be able to inject fresh water stored in the fresh water tank 340 into the forward water flow pipe 311 as high-pressure water. The recovery hopper 330 is installed so as to be able to recover the excavated material (in this example, the excavated earth and sand excavated by the mud pressure shield excavation method using the mud pressure shield excavator 200A) from the return water flow pipe 312 .
The circulation pipeline 310 is laid along the extending direction of the underground tunnel T from the ground G through the shaft V so as to form a circulating water flow from the forward water flow pipe 311 to the homeward water flow pipe 312 . The piston pump 1 is installed in the vicinity of the mud pressure shield excavator 200A so as to be able to inject excavated material into the circulation pipeline 310 .

Although the ranges of the outward water flow pipe 311 and the return water flow pipe 312 can be set as appropriate, in the present embodiment, the outbound water flow pipe 311 is upstream of the U-shaped folded portion in the vicinity of the mud pressure shield excavator 200A. A return water flow pipe 312 is located downstream of the letter-shaped folded portion. In this example, the piston pump 1 is installed near the mud pressure shield excavator 200A so as to be able to inject excavated material into the return water flow pipe 312 .
Further, on the ground G, a mud material tank 240 and a mud material pumping pump 250 are provided to supply mud material to the mud pressure shield excavator 200A. It is piped through the shaft V to the underground mud pressure shield excavator 200A.

As shown in FIG. 2, the mud pressure shield excavator 200A includes a bulkhead 212 of an excavator main body 210 having a cylindrical shape, and a cutter head 213 having a large number of cutter bits attached to the front surface thereof. It is mounted rotatably. A fishtail cutter 219 is attached to the center of the cutter head 213 .
A gear portion 216 of the cutter drum 215 incorporates a drive motor, and the drive motor is operated to rotate the cutter head 213 . A rotary joint 224 is attached to the central portion of the bulkhead 212 , and the mud-making material is injected through the rotary joint 224 from the mud-making material pumping pipe 260 .

In the inner peripheral portion of the excavator main body 210, propulsion jacks 229 extending and contracting with respect to the existing segment S constructed (assembled) on the inner peripheral surface of the tunnel as a lining member are spaced apart in the circumferential direction at predetermined intervals. are arranged multiple times.
A skin plate 230 of the excavator body 210 is fitted around the outer circumference of the existing segment S. Further, an erector (not shown) for assembling the segment S and a stand (not shown) are assembled to the rear portion of the excavator main body 210, and an adjuster for maintaining the perfect circle of the assembled segment S is provided on the stand.

Inside the excavator main body 210, a screw conveyor 225 is arranged with a rearward upward inclination, and the screw conveyor 225 can discharge 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 a cylindrical tube 225a so as to be rotatable by a drive motor 225b at the rear.

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

The piston pump 1 of the first embodiment, as shown in enlarged view in FIG. 3, has a hopper 9 with an upper opening. housed movably. The oscillating tube 2 in the hopper 9 is rotatably supported at its base end 2b at a position below the front wall 1f of the hopper 9. As shown in FIG.
A coupling 5 is provided at the base end portion 2b of the oscillating pipe 2 and connected to the discharge pipe 6 leading to the return water flow pipe 312 shown in FIG. A discharge pipe 6 shown in FIG. 2 is connected to the coupling 5 , and the base end portion 2 b of the swing pipe 2 is arranged to communicate with the discharge pipe 6 .

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

The tip portion 2t of the oscillating tube 2 slides while being pressed against the spectacle plate 8. As shown in FIG. Therefore, a replaceable wear plate 12 is attached to the distal end portion 2t of the oscillating tube 2. As shown in FIG. In this embodiment, the spectacle plate 8 and the wear plate 12 are made of wear-resistant material.
At the back of the hopper 9, a pair of pump cylinders 4L and 4R, one ends of which are open at positions facing the pair of suction and discharge ports 1L and 1R of the spectacle plate 8, are arranged so that their axes are parallel to the swing axis CL. installed.

A pair of pump cylinders 4L, 4R each have a transfer piston 7 within each pump cylinder 4L, 4R. Each transfer piston 7 is hydraulically driven to alternately reciprocate by a pair of drive cylinders 15L and 15R shown in FIG. Each of the pump cylinders 4L, 4R sucks excavated material in the hopper 9 when the corresponding suction/discharge ports 1L, 1R are not in communication with the oscillating tube 2, and sucks the excavated material when in communication with the oscillating tube 2. It is driven to discharge toward the return water flow tube 312 .

As shown in FIG. 4, between the switching lever 11 and the hopper 9, a pair of switching cylinders 3L and 3R are attached as actuators. The pair of switching cylinders 3L, 3R are arranged such that when one of the switching cylinders 3L, 3R extends, the other contracts.
Corresponding to the expansion and contraction of the pair of switching cylinders 3L and 3R, the swing tube shaft 10 rotates about the swing axis CL at a predetermined timing, and the swing tube 2 swings left and right within a predetermined rotation range. be. As a result, the distal end portion 2t of the oscillating tube 2 shown in FIG. 3 is alternately moved to a position facing either the left or right suction/discharge port 1L or 1R.

Here, the piston pump 1 of this embodiment has a backflow prevention mechanism.
In the piston pump 1 of this embodiment, as shown in FIG. ) 20 is installed.
In the backflow prevention mechanism of the present embodiment, as shown in FIG. The width is equal to or greater than the width of the opening of 20 m.

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. As shown in FIG. The left and right seal portions 14L and 14R are provided so as to be rotated while their surfaces facing the spectacle plate 8 are in sliding contact with each other.
The seal portions 14L and 14R of the present embodiment are provided with widths greater than the opening widths of the pair of suction/discharge ports 1L and 1R formed in the spectacle plate 8 in the rotation direction of the swing tube 2, respectively. In the present embodiment, the pair of suction/discharge ports 1L and 1R are circular in shape and have the same opening diameter.
As shown in FIG. 3, the wear ring 20 of this embodiment is spigot-fitted to the inner peripheral surface of the distal end portion 2t of the oscillating tube 2 with an O-ring 30 interposed on the end surface of the inner peripheral surface. ing. Thereby, the wear ring 20 of the swing tube 2 is slidable in the direction of the swing axis CL with respect to the inner peripheral surface of the tip portion 2t.

Also, 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 is the same as the opening diameters of the pair of suction/discharge ports 1L and 1R. The wear ring 20 of this embodiment exhibits a mechanical seal function utilizing internal pressure due to water flow from the coupling 5 side.
That is, in the wear ring 20, when the internal pressure of the oscillating tube 2 rises due to the water flow from the coupling 5 side at the non-communicating position, the end face of the O-ring 30 becomes a pressure receiving surface, and the wear ring 20 moves in the axial direction. It is pushed toward the back side. As a result, the rear end surface of the wear ring 20 is pressed against the facing surface of the spectacle plate 8, forming a sealing structure such that the higher the internal pressure of the oscillating tube 2, the stronger the sealing force.

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 in the direction of the swing axis CL with respect to the outer peripheral surface of the tip portion 2t and the outer peripheral surface of the wear ring 20. In addition, it is attached 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 oscillating tube 2 are in a spigot relationship. At an intermediate position (position shown in FIG. 5(b)) in the stroke, each component is axially fitted in the order shown in FIG.

In the piston pump 1 of the present embodiment, as shown in FIGS. 3 and 4 , the wear plate 12 has a bearing washer 60 s on the outer peripheral side of the wear plate 12 over the entire swinging range of the swing tube 2 . and a plurality of rolling elements 61 and 62 attached to the set plate 40 from the front and rear of the oscillation axis CL, and the inner peripheral side of the wear plate 12 is supported by the bearing washer 60u and the set plate 40. A plurality of rolling elements 63 and 64 mounted on the oscillating axis line CL are supported from the front and rear of the oscillating 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 are vertically aligned even at positions corresponding to the left and right suction/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 which are arranged in the .

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

This propulsion causes a large number of cutter bits attached to the cutter head 213 to excavate the ground ahead. Excavated earth and sand are transferred from the chamber 226 through the screw conveyor 225 to the collection hopper 330 of the water flow slurry transfer system 300A and discharged to the outside.
Next, with the cutter head 213 stopped rotating, the driving jacks 229 are gradually partially retracted, and the segment S is assembled by an erector and a segment adjuster (not shown) and maintained in a perfect circle. Thereafter, the above-described steps are repeated to excavate and form a tunnel T of a predetermined length.

Here, the water-flow slurry transfer system 300A of the first embodiment creates a circulating water flow with high-pressure water pressure-fed from the high-pressure pump 320 to the circulation pipe 310, and excavated earth and sand is removed by the piston pump 1 from the return water flow pipe 312 into the circulating water flow. We built a transfer system that utilizes circulating water flow to transfer the excavated earth and sand to the ground as a slurry. Therefore, it is possible to improve the transfer efficiency of the excavated earth and sand, and it is excellent in maintainability.

In particular, in the piston pump 1 of the first embodiment, when pumping the excavated earth and sand in the hopper 9, the rocking pipe 2 is rocked in the left-right direction by driving the rocking switching cylinders 3L and 3R. The conveying pistons 7 in the main pump cylinders 4L and 4R are driven to alternately move forward and backward.
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, the other suction/discharge port 1R or 1L communicates with the corresponding pump cylinder 4R or 4L with the oscillating pipe 2, and the excavated earth and sand sucked inside is transferred to the conveying piston 7 of the corresponding pump cylinder 4R or 4L. is pressure-fed by the advance of the , and discharged from the swing pipe 2 to the discharge pipe 6 .

At the communicating position with the discharge pipe 6, when pushing out the excavated earth and sand from the conveying piston 7 side, it is pushed out with a force greater than the water flow pressure (for example, 8 MPa) from the coupling 5 side acting in the opposite direction in the swing pipe 2. can be done.
Therefore, according to the piston pump 1 of the present embodiment, the switching cylinders 3L and 3R are driven at a predetermined timing in accordance with the forward and backward movement of the transfer pistons 7 in the two pump cylinders 4L and 4R. The excavated earth and sand in the hopper 9 can be continuously discharged from the swinging pipe 2 through the discharge pipe 6 into the return water flow pipe 312 by swinging the moving pipe 2 left and right.

Here, for example, when pumping excavated earth and sand slurry with a multi-stage centrifugal pump, the slurry concentration that can be pumped is 15 vol% or less, and is restricted to 10 vol% or less from a safer point of view. With the transfer system 300A, even a high-concentration slurry of 15 vol % or more can be transferred using the piston pump 1, which is excellent in terms of improving the operating efficiency.

Furthermore, according to the present embodiment, in order to inject the excavated earth and sand into the circulating water flow of the circulation pipe 310, the piston pump 1 arranged near the mud pressure shield excavator 200A is periodically replaced with sliding parts. , but the only pump that requires maintenance is the piston pump 1 that injects the excavated earth and sand into the circulating water flow.
Therefore, it is possible to simplify operation management and to inject excavated earth and sand into the circulating water flow with a simple configuration. Therefore, compared to the case where slurry of excavated earth and sand is pressure-fed by a multi-stage centrifugal pump, maintenance frequency such as parts replacement work can be reduced and operation efficiency can be improved.

Further, according to the piston pump 1 of the first embodiment, since the backflow prevention mechanism using the wear plate 12 is provided, the oscillating tube 2 is oscillated to move the tip 2t from one suction/discharge port 1L to the other. to the suction/discharge port 1R (the wear plate 12 is moved from the position shown in FIG. 5(a) to the position shown in FIG. 5(c)), or from the other suction/discharge port 1R to the one suction/discharge port 1L (the wear plate 12 is 5(c) to the position shown in FIG. 5(a)), even if the intermediate position shown in FIG. Backflow from the circulation line 310 can be reliably prevented without causing any backflow.

Furthermore, according to the piston pump 1 of the first embodiment, the wear plate 12 and the wear ring 20 are separated from each other. The wear ring 20 having a function can be brought into tighter contact with 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 oscillating tube 2 functions as a mechanical seal. The wear ring 20 can be strongly adhered to the opposing surface to increase 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 oscillating tube 2 can be reliably switched to the communicating position with the .
Therefore, compared to the case where the wear plate 12 and the wear ring 20 are integrated, for example, even during high-pressure feeding, the sealing force is increased, the backflow prevention function is achieved, and the force for rocking the rocking tube 2 is reduced. It can be said that it is extremely excellent as a configuration for reliably switching the oscillating tube 2 to the communicating position with the suction/discharge ports 1L and 1R of the left and right spectacle plates by making it smaller.

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 the excavated earth and sand by the mud pressure shield excavator 200A is improved and the maintainability of the transfer system is improved. Are better.
It should be noted that the water stream slurry transfer system and the water stream slurry transfer method using the same according to the present invention are not limited to the above embodiments, and various modifications are of course possible without departing from the gist of the present invention. is.
For example, in the above-described first embodiment, an example using a piston pump 1 having a backflow prevention function was shown, but the present invention is not limited to this, and for example, as in the following second embodiment, it does not have a backflow prevention function. A hydraulic slurry transfer system may be constructed by a piston pump.

The water flow slurry transfer system of the second embodiment will be described below.
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 in order to secure the backflow prevention function, instead of this, a check valve It differs from the water stream slurry transfer system of the first embodiment in that a mechanism 140 is provided.
Since the configuration other than the piston pump 100 and the check valve mechanism 140 is the same as that of the first embodiment, the differences will be explained below, and the same reference numerals will be given to the configurations that are the same as or correspond to those of the first embodiment. A description thereof will be omitted as appropriate.

In the piston pump 100 of the second embodiment, as shown in FIG. 7, 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 a hopper 901 that stores objects to be transported. . A pair of left and right pump cylinders 104L and 104R are provided behind the suction and discharge ports 101L and 101R.
Inside the hopper 901, there is provided a oscillating tube 102 whose tip portion can be alternately switched between communicating positions facing the left and right suction/discharge ports 101L and 101R. The oscillating tube 102 can oscillate about the oscillating axis CL of the oscillating tube shaft 110 by oscillating drive of the switching lever 111 .

In the piston pump 100 of the second embodiment, the pump itself does not have a backflow prevention function. 8(b), during the switching of the position of the communication port 102t of the oscillating 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, the discharge side and There is a moment when 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. is arranged. The check valve mechanism 140 has a hydraulic cylinder 141 and a poppet valve 142 that is moved forward and backward by driving the hydraulic cylinder 141 . A disc-shaped valve disc 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 disc 142d. there is

The poppet valve 142 closes the opening of the discharge pipe 106 at the forward position shown in FIG. It is configured to be retractable to a position where the flow path of the water flow tube 312 is not obstructed. As a result, in the piston pump 100 of the water flow slurry transfer system 300B of the second embodiment, it is possible to prevent backflow and achieve the same effects as the first embodiment.

In the piston pump 100 of the second embodiment, since the check valve mechanism 140 is provided on the side of the return water flow pipe 312, seals on both sides of the wear plate 12, like the piston pump 1 of the first embodiment, The configuration in which the portions 14L and 14R are supported via a plurality of rolling elements 61 and 62 and a plurality of rolling elements 63 and 64 arranged vertically can be eliminated.
Also, with regard to the check valve mechanism 140 provided on the side of the return water flow pipe 312, the poppet valve 142 is always exposed to the circulating water flow of the circulation pipe 310, so that gravel of the excavated earth and sand is removed from the poppet valve 142 and its surroundings. Problems such as clogging in the driving part do not occur.
In addition, in the above-described first and second embodiments, an example of improving the transfer efficiency of the excavated earth and sand by the mud pressure shield excavator 200A is shown, but it is not limited to this, and for example, the transfer of the excavated earth and sand by the mud shield construction method is shown. 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 an excavated earth and sand transfer system in a mud shield construction method, will be described. In addition, while attaching the same code|symbol to the structure which is the same as that of said 1st thru|or 2nd embodiment, or respond|corresponds, the description is abbreviate|omitted suitably. Further, since the muddy water shield construction method itself is also based on a known construction method, its explanation is omitted.

As shown in FIG. 9, in the water stream slurry transfer system 300C of the third embodiment, in order to perform the mud shield construction method, on the ground G, the mud-making earth material related equipment 240, 250 in the first or second embodiment , 260, a mud water treatment plant 290, a mud water adjustment tank 291 and a mud water supply pump 292 are provided. 200B is piped to supply necessary muddy water.

The treatment tank of the mud treatment plant 290 is configured such that slurry of excavated earth and sand is introduced from the discharge port of the return water flow pipe 312 . The excavated soil that has been classified in the mud treatment plant 290 is recovered to a recovery hopper 330 via a recovery conveyor device 293 .
In addition, the mud that has been classified and processed in the mud water treatment plant 290 is sent to the mud supply pump 292 via the mud water adjustment tank 291, and driven by the mud supply pump 292, from the mud supply pipe 270 toward the mud shield excavator 200B. supplied.

The mud shield excavator 200B is connected to a mud discharge pipe 280 instead of the screw conveyor 225 in the first and second embodiments. A piston pump 1 is arranged near the mud shield excavator 200B in order to inject slurry of excavated earth and sand into the circulation water flow of the circulation pipe 310 . The mud discharge pipe 280 is arranged to supply the hopper 9 of the piston pump 1 with slurry in which the excavated earth and sand excavated by the mud shield excavator 200B are mixed with mud.

According to the water flow slurry transfer system 300C of the third embodiment, since the excavated earth and sand excavated by the mud shield construction method is transferred to the ground, it is possible to improve the transfer efficiency of the excavated earth and sand, and it is excellent in maintainability.
As in the first and second embodiments, in the water flow slurry transfer system 300C of the third embodiment, the piston pump 1 arranged near the mud shield excavator 200B requires periodic replacement of the sliding parts. However, the only pump that requires maintenance is a single piston pump that injects the excavated soil into the circulating water stream.

Therefore, the operation management can be simplified, and the slurry of excavated earth and sand excavated by the mud shield excavator 200B can be injected into the circulation water flow of the circulation pipe 310 with a simple configuration. Therefore, as shown in FIG. 10, compared with the case where the slurry of excavated earth and sand is pumped in order by a plurality of multi-stage centrifugal pumps 450 via a pipe line 460, the frequency of maintenance work for replacing parts is reduced, 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 Oscillating tube 2b Base end 2m Middle part 2t Tip end 3L, 3R Switching cylinder 4L Pump cylinder 4R Pump cylinder 5 Coupling 6 Discharge pipe 7 Conveyance Piston 8 Spectacle plate 9 Hopper 10 Oscillating tube shaft 11 Switching lever 12 Wear plate 13 Openings 14L, 14R Seal 20 Wear ring 20m Opening 30 O-ring 40 Set plate 60 Race washer 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 Spectacle 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 mud shield excavator (tunnel excavator)
210 excavator main body 212 bulkhead 213 cutter head 215 cutter drum 216 gear portion 219 fishtail cutter 224 rotary joint 225 screw conveyor 225a cylindrical tube 225b drive motor 225c screw blade 226 chamber chamber 229 propelling jack 230 skin plate 240 soil material tank 250 Sludge material pressure-feeding pump 260 Sludge material pressure-feeding pipe 270 Sludge supply pipe 280 Sludge discharge pipe 290 Slurry water treatment plant 291 Sludge water adjustment tank 292 Sludge supply pumps 300A, 300B, 300C Water flow slurry transfer system 310 Circulation pipe 311 Forward 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 (3)

A water stream slurry transfer system for injecting excavated material into a water stream and transferring it as a slurry,
a circulation pipeline having an outward water flow pipe and a return water flow pipe and configured to form a water flow from the outward water flow pipe to the homeward water flow pipe;
a high-pressure pump installed so as to be able to inject high-pressure water into the outgoing water flow pipe;
a piston pump installed to inject the excavated material into the circulation pipeline;
a collection hopper installed so as to be able to collect the excavated material from the return water flow pipe;
with
The piston pump includes 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, and a backflow preventing the backflow of the excavated object from the discharge pipe side. and a prevention mechanism . 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 as to be able to inject high-pressure water into the forward water flow pipe,
The piston pump is installed near the tunnel excavator so as to be able to inject the excavated earth and sand 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 from the vicinity of the tunnel excavator to the recovery hopper on the ground. 2. The water-flow slurry transfer system according to claim 1, wherein the water-flow slurry transfer system is configured to form a water flow that extends retrievably and returns a water flow from the ground toward the tunnel excavator back to the ground. A method for transferring excavated earth and sand excavated by a shield excavation method using the water flow slurry transfer system according to claim 1 or 2 ,
A water flow slurry transfer method, characterized by injecting excavated earth and sand into the circulation pipeline by the piston pump, and carrying the excavated earth and sand on the water flow of the circulation pipeline to the ground.

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