JP7084056B1 - Method of pumping fluidized soil and its equipment, and method of pumping dehumidified water and its equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and stably pump a fluidized soil even when a manufacturing plant of fluidized soil and a filling site are separated by a certain distance or more and long-distance pumping or high-low differential pumping is required. It is an object of the present invention to provide a pumping method and an apparatus thereof that enable the above. SOLUTION: From a storage tank 40 for fluidized soil S and a storage tank 40a for dehumidified water M, fluidized soil S and demineralized water M are sucked from a suction branch pipe 20a into a cylinder tube 11 via a check valve 50 for suction. By alternately discharging the fluidized soil S and the muddy water M sucked into the cylinder tube 11 from the discharge branch pipe 20b to the discharge pipe 25 via the discharge check valve 100. , Fluidized soil S and deflated muddy water are pumped. [Selection diagram] Fig. 1

Description

The present invention is a filling method in which underground cavities and spaces are filled with fluidized soil and backfilled. The present invention relates to a pumping method and an apparatus for performing high-low differential pressure feeding over a certain level.

In Japan, there are various underground cavities and spaces such as abandoned coal and lignite mines, wartime underground pits, underground quarry sites and abandoned underground buried objects (hereinafter collectively referred to as "underground cavities, etc."). They are left unattended everywhere, and sometimes they suddenly collapse, causing disasters such as sinking, subsidence, and slopes on the ground surface and ground facilities. For example, the lignite mine was widely mined from the Meiji era to the Showa era and was heavily used as an energy source for various industries, but gradually declined and closed as energy demand switched to petroleum fuel. .. After that, countless abandoned mines were left underground as cavities.

Especially in the Tokai region, the Mino and Owari coalfields produced more than 40% of Japan's lignite, and the lignite mining industry was thriving, leaving many cavities in the abandoned lignite mines, which is also the cause of the disaster mentioned above. .. Therefore, for example, in Mitake-cho, Kani-gun, Gifu Prefecture, where the lignite mining industry was flourishing, a boring survey was conducted and in 2008, the only "lignite layer (cavity) depth distribution map" was published in Japan to prevent disasters. In 2013, it was selected as a "model district for lignite prevention measures project" established in the country, and backfilling of underground cavities such as public facilities and residential land has started. Backfilling of underground cavities represented by abandoned lignite mines is a disaster prevention issue that should be prioritized, regardless of the cause or region.

As a filler for backfilling, fluidized soil that is composed of raw material soil, water and cement and is highly evaluated for its usefulness as a resource-recycling type backfilling material with high fluidity and self-hardening property. Is used (see Patent Documents 1 and 2). The fluidized soil is prepared by adding water to the raw material soil to demud and adjusting the specific gravity to a predetermined value, and removing gravel of a certain size or larger to produce demud water, and a predetermined amount of dry cement is added to the demud water. It is manufactured by adding and kneading cement milk. As the raw material soil, construction-generated soil such as excavated soil and construction sludge are used, and the water is from the water contained in the wet raw material soil and the additional water newly added according to the composition of the fluidized soil. Will be supplied.

When filling underground cavities with fluidized soil, fill from the manufacturing plant according to various conditions such as the properties of the fluidized soil, the condition of the filling site, the distance from the manufacturing plant to the filling site, and the height difference. It is filled by pumping it to the site with a pressure pump (see Patent Document 1), or it is transported from the manufacturing plant to the filling site by a mixer truck or a container car, and then filled using a sand pump or the like (see Patent Document 3). ).

JP-A-2015-98699 Japanese Unexamined Patent Publication No. 2013-64314 Japanese Unexamined Patent Publication No. 2013-108275

When the production plant of fluidized soil and the filling site are adjacent or close to each other, there are few obstacles to pumping, so instead of batch transportation using a mixer car or container car, slurry pumps, sand pumps, etc. It is possible to continuously pump using various pumps such as a squeeze pump and a piston pump.

However, the backfilling work of underground cavities, etc. by filling the fluidized soil in recent years, especially the backfilling work of the abandoned mine of the sub-coal mine, which is actually required to be backfilled, is carried out in urban areas, residential areas, roads, railway sites and narrow areas. There are many tasks such as, etc., and it is required to proceed with the work after securing the daily life and traffic of the local residents, preventing noise and ensuring safety. In addition, it is often the case that the filling site is a wide area construction that covers the entire area.

Therefore, due to geographical conditions, a production plant for fluidized soil may be installed at a location away from the filling site, and the production plant may be kneaded with a dehumidification plant for producing dehumidified water and dehumidified water and cement milk. In many cases, it has to be separated into a kneading plant and installed in another place. When fluidized soil is continuously pumped from a manufacturing plant or kneading plant to a filling site, or when demolition water is continuously pumped from a demineralization plant to a kneading plant, long-distance pumping (for example, in terms of horizontal distance) is performed. Long-distance pumping with a pumping distance of about 800 m to 1200 m) is unavoidable, and high-low differential pumping may be required depending on the site. Due to the distance, various restrictions will be imposed. In addition, since the underground cavity of the abandoned lignite mine has a large volume and a complicated shape, it is necessary to secure a pumping amount of a certain level or more (for example, about 20 m ³ / h to 30 m ³ / h) in consideration of work efficiency. It is also necessary to be able to easily perform maintenance when the pumping failure occurs due to blockage or the like.

Conventionally, squeeze pumps and sand pumps, which have been used for pumping ready-mixed concrete and various mud-like materials and also used for pumping fluidized soil, cannot perform long-distance pumping or high-low differential pumping. Since it is necessary to provide a relay point, a large power supply facility is required for the slurry pump, and it is not feasible, none of them can solve the above-mentioned problems. In that respect, the piston-type pump, which is used for pumping ready-mixed concrete and various mud-like materials as well as the squeeze-type pump, and is also used for pumping fluidized soil, operates the piston at high pressure inside the cylinder tube. It can be driven by oil and has a pumping capacity suitable for long-distance pumping and high-low differential pumping.

The piston-type pumping pump sucks the fluidized soil stored in the hopper into the cylinder tube from the hopper, and then pumps the fluidized soil from the cylinder tube to the pumping pipe. Therefore, it is necessary to switch between suction to the cylinder tube and discharge from the cylinder tube. In the piston type pressure feed pump, a switching mechanism is interposed between the hopper and the cylinder tube, and this switching mechanism switches from suction to discharge. And switching from discharge to suction is performed. When two piston type pressure feed pumps are used in parallel, both suction and discharge are controlled by a switching mechanism so that when suction is performed into one cylinder tube, the pump is discharged from the other cylinder tube. ..

Since the fluidized soil and deflated muddy water use raw soil as a raw material, if the soil particles, especially those with fine particle size and high hardness, are included, the switching mechanism is worn by these soil particles. Is likely to occur, which causes an obstacle in switching between suction from the hopper and discharge to the pumping pipe. That is, when the cylinder tube and the pumping pipe communicate with each other at the time of suction, the cylinder tube and the hopper communicate with each other at the time of discharging, or two cylinder tubes are used in parallel due to the wear of the switching mechanism. The cylinder tubes communicate with each other, making it impossible to smoothly inhale and discharge. In particular, the deflated muddy water is more water-like than the fluidized soil, so that the influence of soil particles is large and wear is likely to occur. For example, in the backfilling work of the abandoned lignite mine in Mitake Town, silt and clay with a particle size of 75 μm or less, which are the raw materials for ceramics, occupy most of the soil, and the soil particles have a fine particle size and high hardness. Therefore, it easily invades the switching mechanism and wears severely. Therefore, although the piston type pumping force is attractive for pumping force, especially long-distance pumping force, it is necessary to frequently replace and maintain the switching mechanism every time wear occurs, and it is not possible to perform efficient pumping work at all. , Cannot be adopted as it is.

Therefore, when the fluidized soil is continuously pumped from the manufacturing plant or kneading plant to the filling site, or when the dehumidified water is continuously pumped from the demineralization plant to the kneading plant, due to geographical conditions, etc. At present, there is no means for efficiently and stably pumping when long-distance pumping is required or when high-low differential pumping above a certain level is required. Therefore, the present invention removes obstacles caused by the particle size and hardness of the raw material soil even when long-distance pumping or high-low differential pumping is required, and efficiently and stably fluidized soil and demudified water. It is an object of the present invention to provide a pumping method and an apparatus thereof capable of pumping.

In order to solve the above-mentioned problems, the present inventor presupposes a piston type pumping pump having a long-distance pumping ability, and wears or wears a switching mechanism which is an obstacle to long-distance pumping of fluidized soil. The following reasoning was made regarding the cause of the pumping failure caused by.
Inference 1: The switching mechanism is a mechanism that opens and closes the opening of the cylinder tube.
Reasoning 2: The switching mechanism operates in direct cooperation with the reciprocating motion of the piston in the cylinder tube.
Inference 3: The switching mechanism switches between suction and discharge as a single member. That is, both the switching of the suction of the fluidized soil from the hopper into the cylinder tube and the switching of the discharge from the cylinder tube to the pumping pipe shall be performed simultaneously by a single switching mechanism.
Inference 4: The switching mechanism is integrated as a member of the piston type pump.
Inference 5: The switching mechanism can communicate with both the hopper and the pumping pipe.

Based on the above inferences 1 to 5, since the failure of pumping lies in the switching mechanism that switches between suction from the hopper to the cylinder tube and discharge from the cylinder tube to the pumping pipe, this switching mechanism is piston-type pumping. If it can be separated from the pump and not involved in the shutoff between the pressure feed pipe and the cylinder tube during suction of the piston type pressure feed pump and the shutoff between the storage tank and the cylinder tube during discharge, the conventional switching mechanism can be used. As a result of diligent research, we came up with the present invention based on the idea that it is possible to overcome the obstacles of pumping due to wear and the like and to pump fluidized soil and demuddy water over a long distance using a piston-type pump. ..

In order to solve the problem of the present invention, according to claim 1, in a method of pumping fluidized soil using a piston-type pressure-feeding pump in which a piston reciprocates in a cylinder tube, the opening side of the cylinder tube of the piston-type pressure-feeding pump. A bifurcated branch pipe is connected to the piston, one branch pipe is used as a suction branch pipe, and the other branch pipe is connected to the suction pipe connected to the storage tank of the fluidized soil via a check valve for suction. The discharge branch pipe is connected to the discharge pipe connected to the pressure feed pipe via the discharge check valve, and the suction check valve enables the inflow of fluidized soil to the piston type pressure feed pump side. At the same time, the outflow of fluidized soil to the storage tank side is blocked, and the check valve for discharge enables the outflow of fluidized soil to the pumping pipe side and fluidization to the piston type pumping pump side. By blocking the inflow of the treated soil, the fluidized treated soil is sucked into the cylinder tube from the suction branch pipe via the check valve for suction from the storage tank of the fluidized treated soil, and the flow sucked into the cylinder tube. A method of pumping fluidized soil by pumping fluidized soil by alternately performing operations of discharging the chemical treated soil from the discharge branch pipe to the discharge pipe via a check valve for discharge is provided as a basis.

According to claim 2, in the piston type pressure feed pump, the piston in the cylinder tube reciprocates to suck the fluidized soil into the cylinder tube and discharge it from the cylinder tube, but the pressure feed pipe and the cylinder tube at the time of suction. According to claim 3, a method that is not involved in shutting off the storage tank and the cylinder tube at the time of shutting off and discharging is to make one of the storage tank or the pumping pipe and the cylinder tube communicate with each other as a piston type pumping pump and at the same time with the other. Provided is a method of using a piston type pressure feed pump which does not have a switching mechanism for shutting off or shutting off from one and communicating with the other at the same time.

Then, according to claim 4, a method of using a piston-type pressure-feeding pump as a piston-type pressure-feeding pump, which does not have a hopper for storing fluidized soil, is according to claim 5, and according to claim 5, a fluidized-treated soil is produced in a manufacturing plant thereof. Provided is a method of pumping to a filling site separated from the filling site by a predetermined distance.

Further, according to claim 6, a method for pumping de-mud water using fluidized soil as a raw material for fluidized soil is provided, and according to claim 7, de-mud water is used to produce de-mud water. Provided is a method provided at a place separated from a plant by a predetermined distance and pumped to a kneading plant for kneading dehumidified water and cement milk to produce fluidized soil.

Further, according to claim 8, a piston type pressure feed pump in which the piston reciprocates in the cylinder tube, a bifurcated branch pipe connected to the opening side of the cylinder tube and having a suction branch pipe and a discharge branch pipe, and a suction branch pipe. For the suction check valve connected, the fluidized soil storage tank connected to the suction check valve via the suction pipe, the discharge check valve connected to the discharge branch pipe, and the discharge check valve. It consists of a pressure feed pipe connected via a discharge pipe, and the suction check valve enables the inflow of fluidized soil to the cylinder tube side and blocks the outflow of fluidized soil to the storage tank side. The discharge check valve enables the outflow of the fluidized soil to the pumping pipe side, and provides a pumping device for the fluidized soil to block the inflow of the fluidized soil to the cylinder tube side.

Then, according to claim 9, the fluidized soil is sucked from the storage tank into the cylinder tube from the suction branch pipe via the check valve for suction, and the fluidized soil sucked into the cylinder tube is sucked into the discharge branch pipe. According to claim 10, the piston type pressure pump is a storage tank of the fluidized soil, which is configured to pump the fluidized soil by alternately performing the operation of discharging from the check valve for discharge to the discharge pipe. According to claim 11, the piston type pressure pump has a hopper for storing fluidized soil, which does not have a mechanism for switching between suction from the cylinder tube and discharge from the cylinder tube to the pressure feed pipe. Provide a configuration that is not provided.

Further, according to claim 12, the check valve for suction or the check valve for discharge includes a support plate having a closed through hole, and an on-off valve whose through hole is pivotally supported on one surface of the support plate so as to be openable and closable. Provided is a pumping device for fluidized soil, which comprises an open-side hollow pipe connected to the outer periphery of one surface of a support plate and a closed-side hollow pipe connected to the outer periphery of the other surface of the support plate.

According to claim 13, a groove is formed in the outer peripheral edge of the through hole, and a packing that comes into contact with the on-off valve at the time of closing is embedded in the groove. According to claim 15, an annular groove is formed in the opening edge of the closed-side hollow pipe to form an annular groove and a packing that is in close contact with one surface of the support plate is embedded in the groove. Provided is a configuration in which a packing that is in close contact with the other surface is embedded in a groove.

Further, according to claim 16, the open side flange is projected from the opening edge portion on the support plate side of the open side hollow pipe, and the closed side flange is projected from the opening edge portion on the support plate side of the closed side hollow pipe. Then, the open side flange was brought into close contact with the outer peripheral edge of one surface of the support plate, and the closed side flange was brought into close contact with the outer peripheral edge of the other surface of the support plate, and the open side flange, the support plate, and the closed side flange were integrally and inseparably connected. According to claim 17, the open-side hollow pipe of the check valve for suction is connected to the suction branch pipe, and the closed-side hollow pipe is connected to the suction pipe. Provided is a configuration in which the open side hollow pipe of the check valve is connected to the discharge pipe and the closed side hollow pipe is connected to the discharge branch pipe.

Further, according to claim 19, there is provided a pumping device for dehumidified water using the above-mentioned fluidized soil as a raw material for the fluidized soil.

According to the present invention having the above configuration, the switching mechanism for switching between the suction into the cylinder tube from the hopper and the hopper and the discharge from the cylinder tube to the pressure feeding pipe is removed from the piston type pressure feed pump, and at the time of suction to the cylinder tube. The control of the flow of fluidized soil and muddy water during discharge from the cylinder tube is separated from the piston type pressure feed pump, and a check valve for suction is used independently for suction and discharge. It is controlled separately by the check valve for discharge. That is, the suction check valve communicates or shuts off only the storage tank and the cylinder tube, and the discharge check valve communicates or shuts off only the pressure feed pipe and the cylinder tube. As a result, the check valve for suction and the check valve for discharge each allow fluidized soil and demudified water to flow in only one direction. In comparison, wear can be suppressed to a minimum, and the storage tank and the pumping pipe do not communicate with each other and interfere with pumping.

In addition, when the suction check valve opens and fluidized soil or muddy water is sucked from the storage tank to the cylinder tube, the discharge check valve is urged in the closing direction by the suction pressure, so that the cylinder tube And the pressure feeding pipe do not communicate with each other. Similarly, when the discharge check valve opens and the fluidized soil or demuddy water is discharged from the cylinder tube to the pumping pipe, the suction check valve is urged in the closing direction by the pressure at the time of discharge. There is no communication between the cylinder tube and the storage tank. Further, when two cylinder tubes are used in parallel, the cylinder tubes do not communicate with each other. Therefore, the suction and pumping are not delayed, and the fluidized soil and the muddy water can be pumped efficiently and stably by using the piston type pumping pump.

In addition, since the through hole of the support plate through which the fluidized soil and muddy water passes is opened and closed by the on-off valve, there is little cause of wear, and the packing equipped over the entire circumference of the through hole of the support plate. The airtightness and adhesion can be improved by adjusting or replacing the material, and the liquidtightness can be maintained for a long period of time. Further, the openings of the suction pipe, the suction branch pipe, the discharge pipe, and the discharge branch pipe that connect the diameters of the openings of the open side hollow pipe and the closed side hollow pipe in the check valve for suction and the check valve for discharge. Since the pipe diameter is the same as that of the part, it is possible to replace the check valve for suction and the check valve for discharge as a unit in the assembly at the pumping site without complicated maintenance work. It is possible to minimize the influence on the pumping work.

Therefore, due to geographical conditions, a production plant for fluidized soil may be installed at a location away from the filling site, and the production plant may be kneaded with a demineralization plant for producing dehumidified water and dehumidified water and cement milk. Even if it is separated into a kneading plant and installed in another place or if there is a height difference of a certain difference or more, it is possible to pump the fluidized soil and the de-mud water as its raw material, and lignite. It will be possible to implement a filling method in which underground cavities such as abandoned mines are filled with fluidized soil and backfilled.

In the present invention, a piston-type pressure pump that does not have a hopper for storing fluidized soil and deflated muddy water is used, and the fluidized soil and deflated muddy water are sucked into the cylinder tube. It is done directly from the demolition water storage tank. Therefore, it is not necessary to supply the fluidized soil and the muddy water from the storage tank to the hopper, and the suction of the fluidized soil and the muddy water is not interrupted.

FIG. 3 is a plan view of a main part of a method for pumping fluidized soil and deflated muddy water according to the present invention and an apparatus thereof. The whole layout drawing which shows the 1st Embodiment of this invention. The whole layout drawing which shows the 2nd Embodiment of this invention. The process explanatory drawing which shows the main part of the pumping process. The perspective view which shows the installation state of the check valve for suction and the check valve for discharge. The perspective view which shows the installation means of the check valve for suction and the check valve for discharge. The perspective view of the 1st Embodiment of the check valve for suction and the check valve for discharge. The assembly diagram of FIG. The disassembled assembly diagram of FIG. 7. Sectional drawing when the on-off valve is closed. Sectional drawing when the on-off valve is opened. The perspective view of the 2nd Embodiment of the check valve for suction and the check valve for discharge. The assembly diagram of FIG. The disassembled assembly drawing of FIG. Sectional drawing when the on-off valve is closed. Sectional drawing when the on-off valve is opened.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a main part of a pumping method of fluidized soil S and defrosted water M according to the present invention and the apparatus thereof, FIG. 2 is an overall layout showing the first embodiment, and FIG. 3 is the second embodiment thereof. FIG. 4 is an overall layout diagram showing the above, and FIG. 4 is a process explanatory diagram showing a main part of the pumping process.

In the present invention, as shown in FIGS. 2 and 3, fluidized soil S is installed in the manufacturing plant 30 or the kneading plant 30b as a filler for filling and backfilling the underground cavity 35a of the abandoned lignite mine site. It is separated from the storage tank 40 by a certain distance or more, or pumped to a filling site 35 having a height difference. Alternatively, as shown in FIG. 3, the dehumidified water M as a raw material for producing the fluidized soil S is separated from the storage tank 40a installed in the demolition plant 30a by a certain distance or more, or the kneading plant 30b having a height difference. Pump up to.

First, the embodiment shown in FIG. 2 in which the completed fluidized soil S is pumped to the filling site 35 will be described. The fluidized soil S is a fluid produced by kneading raw soil 1, water 3, and cement milk 5, and the raw soil 1 is transported to a manufacturing plant 30 by a dump truck 7 or the like and accumulated in a predetermined place. Ru. As the raw material soil 1, various soil materials such as construction-generated soil and construction sludge can be widely used, but the raw material soil used for the filling work of the abandoned lignite mine in Mitake Town mentioned above has a particle size of 75 μm or less. It contains a lot of hard silt and clay.

In the manufacturing plant 30, based on the specifications of the fluidized soil S to be manufactured, a predetermined amount of raw material soil 1 is supplied into the mud removal tank 31 by a backhoe 36 or the like, and a predetermined amount of water 3 is supplied to remove the mud. , Obtain de-mud water M having a predetermined water content ratio. Then, the de-muddy water M is supplied to an appropriate mixer device 38 such as a forced biaxial mixer or a uniaxial continuous mixer by the slurry pump 39, and the cement is adjusted and supplied from the cement silo 33 to the cement milk 5 having a predetermined water content ratio. Then, the fluidized soil S is produced by kneading and stored in the storage tank 40. Therefore, the water content in the fluidized soil S is the total amount of water contained in the raw material soil 1, water 3 added to the mud removal tank 31 at the time of mud removal, and water contained in the cement milk 5. It is also possible to use dry cement instead of cement milk 5, and the manufacturing process of these fluidized soil S is conventionally known.

When long-distance pumping is performed using the piston-type pumping pump 10 from the storage tank 40 that stores the fluidized soil S manufactured in the above step to the filling site 35 that is separated by a pumping distance of about 800 m to 1200 m in terms of horizontal distance. Will be described as an example. It should be noted that even if the pumping distance is 800 m or less, pumping is possible, and the pumping distance of 1200 m does not indicate a limit. In the cylinder tube 11, the piston type pressure feed pump 10 sucks the fluidized soil S into the cylinder tube 11 by reciprocating the piston equipped at the tip of the rod 12 as the rod 12 expands and contracts. It is configured to discharge from the cylinder tube 11, and in the present invention, it is equipped with two cylinder tubes 11, and when the fluidized soil S is sucked into one cylinder tube 11, the other cylinder By discharging the fluidized soil S from the tube 11, continuous pumping is performed. The opening of the cylinder tube 11 is always open.

The piston type pressure feed pump 10 used in the present invention is not provided with a hopper for storing the fluidized soil S. Further, it does not have a switching mechanism for communicating one of the storage tank 40 or the pumping pipe 15 with the cylinder tube 11 and simultaneously shutting off the other, or blocking one and communicating with the other at the same time. That is, it is not equipped with a single switching mechanism for switching both suction from the storage tank 40 into the cylinder tube 11 and discharge from the cylinder tube 11 to the pumping pipe 15. Therefore, although the piston type pressure feed pump 10 sucks the fluidized soil S into the cylinder tube 11 and discharges it from the cylinder tube 11 by the reciprocating motion of the piston in the cylinder tube 11, the cylinder tube 11 itself sucks. It does not participate in the shutoff between the pumping pipe 15 and the cylinder tube 11 at the time and the shutoff between the storage tank 40 and the cylinder tube 11 at the time of discharge.

In the piston type pressure feed pump 10, one branch pipe is directly connected to the opening side of each of the two cylinder tubes 11 by directly connecting the base end of the bifurcated branch pipe 20 having a branch pipe whose tip is bifurcated. The suction branch pipe 20a is connected to the suction pipe 45 connected to the storage tank 40 via a check valve 50 for suction. The suction check valve 50 enables the inflow of the fluidized soil S from the storage tank 40 to the piston type pressure feed pump 10 side, and blocks the outflow of the fluidized soil S to the storage tank 40 side. ing. The other branch pipe is a discharge branch pipe 20b, which is connected to the discharge pipe 25 connected to the pressure feed pipe 15 via the discharge check valve 100. The discharge check valve 100 enables the outflow of the fluidized soil S from the cylinder tube 11 to the pumping pipe 15 side, and blocks the inflow of the fluidized soil S to the piston type pressure feed pump 10 side. is doing.

Therefore, by the contraction operation of the rod 12 in one cylinder tube 11, the fluidized soil S in the storage tank 40 is sucked into the suction branch pipe of the bifurcated branch pipe 20 via the suction pipe 45 and the check valve 50 for suction. After passing through 20a, it is sucked into the cylinder tube 11. At this time, the discharge check valve 100 that shuts off the discharge from one of the cylinder tubes 11 is closed, and the discharge check valve 100 is urged in the closing direction by the pressure at the time of suction. Further, as shown in FIG. 1, since the two discharge check valves 100 communicate with each other via the discharge pipe 25, the extension operation of the rod 12 in the other cylinder tube 11 causes the other cylinder tube 11 to communicate with each other. It is also urged in the closing direction by the pressure of the fluidized soil S discharged from the bifurcated branch pipe 20 through the discharge branch pipe 20b. Therefore, one of the cylinder tubes 11 performing the suction operation and the pressure feeding pipe 15 do not communicate with each other, so that suction cannot be performed or the fluidized soil S flows back from the discharge pipe 25 to the one cylinder tube 11. There is no.

Further, the fluidized soil S sucked into the cylinder tube 11 by the extension operation of the rod 12 in the other cylinder tube 11 is discharged from the discharge branch pipe 20b of the bifurcated branch pipe 20 via the discharge check valve 100. , Discharge from the discharge pipe 25 to the pressure feeding pipe 15. At this time, the suction check valve 50 that shuts off suction to the other cylinder tube 11 is closed, and the suction check valve 50 is urged in the closing direction by the pressure at the time of discharge. In addition, as shown in FIG. 1, since the two suction check valves 50 communicate with each other via the suction pipe 45, the reduction operation of the rod 12 in the one cylinder tube 11 causes the one cylinder tube to operate. It is also urged in the closing direction by the pressure of the fluidized soil S sucked into 11 through the suction branch pipe 20a of the bifurcated branch pipe 20. Therefore, the other cylinder tube 11 performing the discharge operation and the storage tank 40 do not communicate with each other, so that pumping is not possible and the fluidized soil S does not flow back from the suction pipe 45 to the storage tank 40.

By alternately performing the operation of sucking the fluidized soil S and the operation of discharging the fluidized soil S, the fluidized soil S is separated from the manufacturing plant 30 by a predetermined distance via the pumping pipe 15 laid by a predetermined path. It is pumped to the filling site 35.

Although the suction check valve 50 and the discharge check valve 100 have different installation directions (directions that regulate inflow and outflow) for inflowing or shutting off the fluidized soil S, the configuration itself is the same. It is the same. The configuration of the first embodiment will be described with reference to FIGS. 7 to 11. 7 is a perspective view of the first embodiment of the check valve 50 for suction and the check valve 100 for discharge, FIG. 8 is an assembly diagram of FIG. 7, and FIG. 9 is an exploded assembly diagram of FIG. 7. The suction check valve 50 or the discharge check valve 100 includes a support plate 60 having a through hole 63 and an on-off valve 70 in which the through hole 63 is rotatably supported on one surface of the support plate 60. The open-side hollow tube 80 connected to the outer periphery of one surface of the support plate 60, and the closed-side hollow tube 90 connected to the outer periphery of the other surface of the support plate 60.

An annular groove 61 is formed in the outer peripheral edge of the through hole 63 of the support plate 60, and an annular packing 62 that abuts on the on-off valve 70 when closed is embedded so as to slightly protrude from the groove 61 (FIG. 10, FIG. See FIG. 11). Therefore, when the on-off valve 70 is closed, the on-off valve 70 is urged and brought into close contact with the support plate 60 by the pressure generated by the suction / discharge operation of the piston type pressure feed pump 10, and the liquidtightness is maintained by the packing 62. Further, an annular groove 81 is formed in the opening edge of the open side hollow pipe 80 (see FIGS. 10 and 11), and a packing 82 in close contact with one surface of the support plate 60 is embedded in the groove 81, and similarly. An annular groove 91 is formed in the opening edge of the closed-side hollow pipe 90, and a packing 92 in close contact with the other surface of the support plate 60 is embedded in the groove 91.

The open side flange 83 is projected from the opening edge of the open side hollow tube 80 on the support plate 60 side, and the closed side flange 93 is projected from the open edge of the closed side hollow tube 90 on the support plate 60 side. The open side flange 83 is brought into close contact with the outer peripheral edge of one surface of the support plate 60, and the closed side flange 93 is brought into close contact with the outer peripheral edge of the other surface of the support plate 60. The outer periphery of the is fastened with a bolt 84 and a nut 94, and the three parties are integrally fixed inseparably. At this time, the packing 82 maintains the liquidtightness of the open side hollow tube 80 and the support plate 60, and the packing 92 maintains the liquidtightness of the closed side hollow tube 90 and the support plate 60.

As shown in FIG. 9, a fixing block 65 having a pin hole 65a formed at the tip thereof is inserted into an insertion hole 64 formed adjacent to the groove portion 61 of the support plate 60 and integrated with the closed-side hollow pipe 90. It is fixed with bolts 66. On the other hand, an on-off block 75 having two pin holes 75a and 75b bored in the vertical direction is fixed to the surface of the on-off valve 70 on the open-side hollow tube 80 side, and the on-off valve 70 is attached to the pin hole 65a of the fixing block 65. The pin holes 75a and 75b of the opening / closing block 75 are aligned in series in the vertical direction, and are sandwiched by a pair of left and right rotating blocks 73 from both sides of the fixing block 65 and the opening / closing block 75. In the rotating block 73, the pin holes 73a corresponding to the pin holes 65a drilled in the fixed block 65 and the pin holes 73b, 73c corresponding to the pin holes 75a, 75b drilled in the opening / closing block 75 are bored in the vertical direction. The connecting pin 74a is inserted into the pin hole 73a and the pin hole 65a, the connecting pin 74b is inserted into the pin hole 73b and the pin hole 75a, and the connecting pin 74c is inserted into the pin hole 73c and the pin hole 75b. And fix each. As a result, the fixing block 65 and the opening / closing block 75 are integrally fixed by the rotating block 73.

Therefore, the on-off valve 70 is rotatably supported on the support plate 60 with the fixed block 65 as an axis, opens toward the open side hollow pipe 80, and closes toward the closed side hollow pipe 90. Therefore, it does not rotate in the opposite direction. Reference numeral 85 shown in FIGS. 10 and 11 is a stopper for regulating the opening position of the on-off valve 70.

When the on-off valve 70 is rotated, the connecting pin 74a acts as a rotation shaft for rotating the on-off valve 70. The pair of left and right rotating blocks 73 have the same configuration, and the pin holes 65a of the fixed block 65, the pin holes 75a, 75b of the opening / closing block 75, and the pin holes 73a, 73b, 73c of the rotating block 73 have the same configuration. Therefore, when the rotating block 73 and the connecting pin 74a that connect the fixed block 65 that rotates when the on-off valve 70 is opened and closed and the connecting pin 74a are worn, the rotating block 73 is used by turning it upside down and connecting. It is also possible to replace the pin 74a with other connecting pins 74b and 74c. As a result, maintenance of the rotating block 73, which rotates each time the suction and discharge of the fluidized soil S is switched, can be easily performed.

In the check valve 50 for suction and the check valve 100 for discharge, the pipe diameters of the openings of the open side hollow pipe 80 and the closed side hollow pipe 90 are both the suction pipe 45, the suction branch pipe 20a, the discharge pipe 25, and the discharge pipe. It is the same as the pipe diameter of the opening of the branch pipe 20b. As shown in FIGS. 5 and 6, the open side hollow pipe 80 of the suction check valve 50 is connected to the suction branch pipe 20a by using the connecting tool 55, and the closed side hollow pipe 90 is similarly connected. It is connected to the suction pipe 45 using the tool 55. Further, the open side hollow pipe 80 of the discharge check valve 100 is connected to the discharge pipe 25, and the closed side hollow pipe 90 is connected to the discharge branch pipe 20b. As described above, the suction check valve 50 and the discharge check valve 100 have the same configuration and are installed in different directions.

Therefore, due to the contraction operation of the rod 12 in the cylinder tube 11, the fluidized soil S in the storage tank 40 passes through the suction pipe 45 and the check valve 50 for suction, and enters the cylinder tube 11 from the suction branch pipe 20a. However, the fluidized soil S in the pressure feed pipe 15 and the discharge pipe 25 is shut off by the discharge check valve 100, and the discharge check valve 100 is closed in the closing direction due to the pressure at the time of suction. Since it is urged, it is blocked more firmly and does not flow into the cylinder tube 11.

On the other hand, the fluidized soil S sucked into the cylinder tube 11 by the extension operation of the rod 12 in the cylinder tube 11 passes through the discharge branch pipe 20b and the discharge check valve 100 and is pumped from the discharge pipe 25. Although it is pumped to the pipe 15, the fluidized soil S in the cylinder tube 11 and the suction branch pipe 20a is shut off by the suction check valve 50, and the suction check valve 50 is closed by the pressure at the time of discharge. Since it is urged in the direction, it is blocked more firmly and is not pumped to the storage tank 40.

Using the piston-type pump 10 having the above configuration, the fluidized soil S stored in the manufacturing plant 30 or the storage tank 40 installed at an appropriate location is filled into the filling site 35a of the underground cavity of the abandoned lignite mine 35a. Until, it is pumped and filled by the reciprocating motion of the piston. In the example shown in FIG. 2, long-distance pumping with a pumping distance of 1200 m or more in terms of horizontal distance could be performed with a pumping amount of about 30 m ³ / h. In FIG. 1, the shock absorber 95 installed at a predetermined position in the pumping path is a device for accumulating the pressure at the time of pumping to mitigate the noise and impact of the water phenomenon. The storage tank 40 is preferably installed in the manufacturing plant 30, but the installation location is not limited. If an appropriate place cannot be secured in the manufacturing plant 30, it may be installed in a nearby place, and in that case, it may be pumped from the manufacturing plant 30 to the storage tank 40 by an appropriate means.

Next, a second embodiment of the present invention in which the deflated muddy water M is pumped in place of the fluidized soil S will be described with reference to FIG. In the filling method in which the fluidized soil S is filled in the underground cavity 35a of the abandoned lignite mine and backfilled, the manufacturing plant 30 can be secured in the same place even if it is located away from the filling site 35. There are many things you can't do. In that case, as shown in FIG. 3, the demolition plant 30a for producing the demineralization water M and the kneading plant 30b for kneading the demineralization water M and the cement milk 5 can be separately installed in the production plant 30. There is no choice but to install it in the place of.

Therefore, in order to produce the fluidized soil S, first, the raw material soil 1 and water 3 are supplied to the demolition tank 31 at the demolition plant 30a and demudged with a slurry 36 or the like to produce dehumidified water M. The demud water M is stored in the storage tank 40a by the slurry pump 39. Then, the de-mud water M in the storage tank 40a is pumped and stored by using the piston type pressure pump 10 to the de-mud water tank 37 installed in the kneading plant 30b provided at another location. The muddy water M stored in the muddy water tank 37 is supplied to the mixer device 38 by the slurry pump 42 in the same manner as in the first embodiment shown in FIG. 2, and the cement is added from the cement silo 33 to a predetermined water content ratio. The cement milk 5 of the above is adjusted and supplied, and the fluidized soil S is produced by kneading and stored in the storage tank 40. Then, as in the first embodiment, the fluidized soil S stored in the storage tank 40 is pumped to the filling site 35 using the piston type pressure feeding pump 10 to fill the underground cavity or the like 35a.

In the second embodiment, the dehumidified water M is pumped in place of the fluidized soil S of the first embodiment, but the pumping method using the piston type pump 10 and its apparatus are the same as those of the first embodiment. Therefore, the description thereof will be omitted. The reason why it was difficult to pump the fluidized soil S over a long distance using a conventional piston-type pumping pump is that the soil particles contained in the fluidized soil S are unevenly fine in particle size and high in hardness. Wear of the switching mechanism due to soil particles may cause an obstacle in switching between suction from the hopper and discharge to the pumping pipe. Since these soil particles are supplied by the raw material soil 1 and are contained in the demolition water M, it is difficult for the demolition water M to be pumped over a long distance with the conventional piston type pumping pump. Rather, it can be said that it was the deflated muddy water M that made it difficult to pump the fluidized soil S.

Therefore, the present invention can be used as it is for the long-distance pumping of the deflated muddy water M as the raw material of the fluidized soil S, which is the previous stage, as well as the pumping of the fluidized soil S. In this way, by separating the locations of the demolition plant 30a for producing the demineralization water M and the kneading plant 30b for kneading the fluidized soil S, it is possible to relax the installation conditions such as the installation location and the installation area of both. can.

Next, a second embodiment of the suction check valve 50 and the discharge check valve 100 will be described with reference to FIGS. 12 to 16. The same configurations as those of the first embodiment shown in FIGS. 7 to 11 are designated by the same reference numerals, and the description thereof will be omitted. The second embodiment of the suction check valve 50 and the discharge check valve 100 has the same structure as the first embodiment, the mounting structure of the on-off valve 70 on the support plate 60, and the liquidtightness of the support plate 60 and the on-off valve 70. The mounting structure of the packing for securing is different. An annular groove 71 is formed on one surface of the on-off valve 70 that comes into contact with the support plate 60 when the support plate 60 is closed, and an annular packing 72 is embedded in the groove 71 via a washer 76 so as to protrude from one surface of the on-off valve 70. .. Further, an appropriate number of packing adjusting pins 77 are passed through the circumference of the other surface of the on-off valve 70 and screwed. Therefore, by tightening the packing adjusting pin 77, the amount of protrusion of the packing 72 from the on-off valve 70 can be adjusted.

A pair of left and right brackets 68 having a pin hole 67a formed at the tip of the support plate 60 projecting from the support plate 60 adjacent to the through hole 63 and a pin hole 68a formed on the outer peripheral portion of the on-off valve 70. The on-off valve 70 is pivotally supported by the fixing block 67 of the support plate 60 by sandwiching the fixing block 67 with the bracket 68 and inserting the connecting pin 69 into the pin holes 67a and 68a. As a result, the on-off valve 70 can open and close the through hole 63 of the support plate 60.

According to the present invention having the above configuration, the switching mechanism for switching between the suction into the cylinder tube from the hopper and the hopper and the discharge from the cylinder tube to the pressure feeding pipe is removed from the piston type pressure feed pump, and at the time of suction to the cylinder tube. The control of the flow of fluidized soil and muddy water during discharge from the cylinder tube is separated from the piston type pressure feed pump, and a check valve for suction is used independently for suction and discharge. It is controlled separately by the check valve for discharge. That is, the suction check valve communicates or shuts off only the storage tank and the cylinder tube, and the discharge check valve communicates or shuts off only the pressure feed pipe and the cylinder tube. As a result, the check valve for suction and the check valve for discharge each allow fluidized soil and demudified water to flow in only one direction. In comparison, wear can be suppressed to a minimum, and the storage tank and the pumping pipe do not communicate with each other and interfere with pumping.

In addition, when the suction check valve opens and fluidized soil or muddy water is sucked from the storage tank to the cylinder tube, the discharge check valve is urged in the closing direction by the suction pressure, so that the cylinder tube And the pressure feeding pipe do not communicate with each other. Similarly, when the discharge check valve opens and the fluidized soil or demuddy water is discharged from the cylinder tube to the pumping pipe, the suction check valve is urged in the closing direction by the pressure at the time of discharge. There is no communication between the cylinder tube and the storage tank. Further, when two cylinder tubes are used in parallel, the cylinder tubes do not communicate with each other. Therefore, the suction and pumping are not delayed, and the fluidized soil and the muddy water can be pumped efficiently and stably by using the piston type pumping pump.

In addition, since the through hole of the support plate through which the fluidized soil and muddy water passes is opened and closed by the on-off valve, there is little cause of wear, and the packing equipped over the entire circumference of the through hole of the support plate. The airtightness and adhesion can be improved by adjusting or replacing the material, and the liquidtightness can be maintained for a long period of time. Further, the openings of the suction pipe, the suction branch pipe, the discharge pipe, and the discharge branch pipe that connect the diameters of the openings of the open side hollow pipe and the closed side hollow pipe in the check valve for suction and the check valve for discharge. Since the pipe diameter is the same as that of the part, it is possible to replace the check valve for suction and the check valve for discharge as a unit in the assembly at the pumping site without complicated maintenance work. It is possible to minimize the influence on the pumping work.

Therefore, due to geographical conditions, a production plant for fluidized soil may be installed at a location away from the filling site, and the production plant may be kneaded with a demineralization plant for producing dehumidified water and dehumidified water and cement milk. Even if it is separated into a kneading plant and installed in another place or if there is a height difference of a certain difference or more, it is possible to pump the fluidized soil and the de-mud water as its raw material, and lignite. It will be possible to implement a filling method in which underground cavities such as abandoned mines are filled with fluidized soil and backfilled.

S ... Fluidized soil M ... Demolition water 1 ... Raw material soil 3 ... Water 5 ... Cement milk 7 ... Dump truck 10 ... Piston type pump 11 ... Cylinder tube 12 ... Rod 15 ... Pumping pipe 20 ... Bifurcated branch pipe 20a ... Suction branch pipe 20b ... Discharge branch pipe 25 ... Discharge pipe 30 ... Manufacturing plant 30a ... Dehumidification plant 30b ... Kneading plant 31 ... Demolition tank 33 ... Cement silo 35 ... Filling site 35a ... Underground cavity 36 ... Back flange 37 ... Solution Muddy water tank 38 ... Mixer device 39, 42 ... Slurry pump 40, 40a ... Storage tank 45 ... Suction pipe 50 ... Check valve for suction 55 ... Connector 60 ... Support plate 61 ... Groove 62 ... Packing 63 ... Through hole 64 ... Insertion Hole 65 ... Fixed block 65a ... Pin hole 66 ... Bolt 67 ... Fixed block 67a ... Pin hole 68 ... Bracket 68a ... Pin hole 69 ... Connecting pin 70 ... Open / close valve 71 ... Groove 72 ... Packing 73 ... Rotating block 73a, 73b, 73c ... Pin hole 74a, 74b, 74c ... Connecting pin 75 ... Open / close block 75a, 75b ... Pin hole 76 ... Seat 77 ... Packing adjustment pin 80 ... Open side hollow pipe 81 ... Groove 82 ... Packing 83 ... Open side flange 84 ... Bolt 85 ... Stopper 90 ... Closed side hollow pipe 91 ... Groove 92 ... Packing 93 ... Closed side flange 94 ... Nut
95 ... Shock absorber 100 ... Check valve for discharge

Claims (19)

In the pumping method of fluidized soil using a piston-type pressure pump in which the piston reciprocates in the cylinder tube.
A bifurcated branch pipe is connected to the opening side of the cylinder tube of the piston type pump, one branch pipe is used as a suction branch pipe, and the suction pipe is connected to the fluidized soil storage tank via a check valve for suction. The other branch pipe is used as a discharge branch pipe, and is connected to the discharge pipe connected to the pumping pipe via a check valve for discharge.
The check valve for suction enables the inflow of fluidized soil to the piston type pressure feed pump side and blocks the outflow of fluidized soil to the storage tank side, and the check valve for discharge is on the pressure feed piping side. By enabling the outflow of fluidized soil to the piston type pump and blocking the inflow of fluidized soil to the piston type pump.
The fluidized soil is sucked into the cylinder tube from the suction branch pipe through the check valve for suction from the fluidized soil storage tank, and the fluidized soil sucked into the cylinder tube is discharged from the discharge branch pipe. A method for pumping fluidized soil, which comprises pumping fluidized soil by alternately performing operations of discharging to a discharge pipe via a check valve.
In the piston type pressure feed pump, the piston in the cylinder tube reciprocates to suck the fluidized soil into the cylinder tube and discharge it from the cylinder tube, but the pressure feed pipe and the cylinder tube are shut off and discharged during suction. The method for pumping fluidized soil according to claim 1, which is not involved in shutting off the storage tank and the cylinder tube at the time. As a piston-type pump, a piston-type pump that does not have a switching mechanism for communicating one of the storage tank or the pumping pipe with the cylinder tube and simultaneously shutting off the other, or shutting off one and communicating with the other at the same time. The method for pumping fluidized soil according to claim 1 or 2 to be used. The method for pumping fluidized soil according to claim 1, 2, or 3, wherein as the piston-type pumping pump, a piston-type pumping pump that does not include a hopper for storing fluidized soil is used. The method for pumping fluidized soil according to claim 1, 2, 3 or 4, wherein the fluidized soil is pumped to a filling site separated from the manufacturing plant by a predetermined distance. In the pumping method of fluidized soil according to any one of claims 1 to 4.
A method for pumping dehumidified water, characterized in that the fluidized soil is dehumidified water as a raw material for the fluidized soil. The solution according to claim 6, wherein the de-mud water is provided at a predetermined distance from the de-sewage plant that produces the de-mud water, and the de-mud water and cement milk are kneaded and pumped to a kneading plant that produces fluidized soil. How to pump muddy water. A piston type pressure feed pump in which the piston reciprocates in the cylinder tube,
A bifurcated branch pipe connected to the opening side of the cylinder tube and having a suction branch pipe and a discharge branch pipe,
A check valve for suction connected to the suction branch pipe,
A storage tank for fluidized soil connected to a check valve for suction via a suction pipe,
A check valve for discharge connected to the discharge branch pipe,
It consists of a pressure feed pipe connected to the check valve for discharge via a discharge pipe.
The check valve for suction allows the inflow of fluidized soil to the cylinder tube side, blocks the outflow of the fluidized soil to the storage tank side, and the check valve for discharge to the pumping pipe side. A pumping device for fluidized soil, which enables the outflow of fluidized soil and blocks the inflow of fluidized soil to the cylinder tube side. The fluidized soil is sucked from the storage tank into the cylinder tube from the suction branch pipe via the check valve for suction, and the fluidized soil sucked into the cylinder tube is sucked into the cylinder tube through the check valve for discharge from the discharge branch pipe. The pumping device for fluidized soil according to claim 8, wherein the fluidized soil is pumped by alternately performing operations of discharging the fluidized soil through the discharge pipe. The fluidized soil according to claim 8 or 9, wherein the piston type pump does not have a mechanism for switching between suction of the fluidized soil from the storage tank to the cylinder tube and discharge from the cylinder tube to the pumping pipe. Pumping device. The pumping device for fluidized soil according to claim 8, 9 or 10, wherein the piston type pump does not include a hopper for storing the fluidized soil. Check valves for suction or check valves for discharge are
A support plate with a closed through hole, an on-off valve that pivotally supports the through hole on one side of the support plate, an open-side hollow pipe connected to the outer periphery of one side of the support plate, and other support plates. The pumping device for fluidized soil according to claim 8, 9, 10 or 11, comprising a closed-side hollow pipe connected to the outer periphery of the surface. The pumping device for fluidized soil according to claim 12, wherein a groove is formed in the outer peripheral edge of the through hole, and a packing that comes into contact with the on-off valve at the time of closing is embedded in the groove. The pumping device for fluidized soil according to claim 12 or 13, wherein an annular groove is formed in the opening edge of the open-side hollow pipe, and a packing in close contact with one surface of the support plate is embedded in the groove. The pumping device for fluidized soil according to claim 12, 13 or 14, wherein an annular groove is formed in the opening edge of the closed-side hollow pipe and a packing in close contact with the other surface of the support plate is embedded in the groove. The open side flange is projected from the opening edge on the support plate side of the open side hollow pipe, and the closed side flange is projected from the open edge on the support plate side of the closed side hollow pipe to support the open side flange. 12. Or the pumping device for fluidized soil according to 15. The pumping of fluidized soil according to claim 12, 13, 14, 15 or 16, wherein the open side hollow pipe of the check valve for suction is connected to the suction branch pipe and the closed side hollow pipe is connected to the suction pipe. Device. The fluidized soil according to claim 12, 13, 14, 15, 16 or 17, wherein the open-side hollow pipe of the check valve for discharge is connected to the discharge pipe and the closed-side hollow pipe is connected to the discharge branch pipe. Pumping device. In the pumping device for fluidized soil according to any one of claims 8 to 18.
A pumping device for dehumidified water, characterized in that the fluidized soil is dehumidified water as a raw material for the fluidized soil.

Images