JP3328205B2 - In-pipe solidification treatment apparatus and construction method by pneumatic pumping method using reciprocating pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe solidification apparatus and a construction method by a pneumatic feeding method using a reciprocating pump.

[0002]

2. Description of the Related Art In-pipe solidification processing by the pneumatic pumping method involves injecting a solidifying material (such as cement) into mud sent from an pneumatic pumping vessel or an air pump, and plugging in a mud pipe during air conveyance. And kneading the mud and the solidified material by a line mixer installed in the middle of the mud feeding pipeline. In this case, it is necessary to mix the mud and the solidified material at a constant rate, and it is important to maintain a constant amount of mud.

[0003] In general, a method of feeding a fixed amount of mud from a sediment hopper includes a method of feeding a fixed amount of mud by combining a screw feeder and a vortex pump, a method of sending a batch type of mud by a tank method, and a method of rotating a mud provided with a lower portion of a hopper. Some use a cutting device.

[0004] In the in-pipe solidification treatment method by the pneumatic feeding method, a combination of a screw feeder and a centrifugal pump is generally used in many cases in order to keep a constant amount of mud.

[0005]

In THE INVENTION Problems to be Solved] Generally, air pressure-feeding method tube during solidification method by is directed to a fragile dredged soil, if homogeneous soft soil often sand or sand fraction not borrow <br /> it may be processed to highly viscous what is required.

[0006] The screw feeder and the centrifugal pump system
There is no problem with the mud feeding of soft mud (moisture content of 100% or more), but the load becomes large with sand (especially water content of 70% or less) such as sandy soil and clay having a low moisture content, and the mud sending capacity is increased. Extremely reduced, the planned construction capacity can not be maintained,
It may not be possible to send mud.

In the screw feeder and the centrifugal pump system, the flow rate of the mud is adjusted by the rotation speed of the screw and the rotation speed of the pump. In general, the rotation of the motor is controlled by an inverter method. However, when a constant amount of mud is fed under a range of less than the planned number of rotations, the torque is reduced due to the characteristics of the inverter control. For this reason, sandy soil and low moisture content
Even when a small amount of mud is fed due to a low mud flow such as clay , the motor must be rotated with a high torque. Therefore, operation becomes difficult with sandy soil or clay having a low water content.

[0008] As described above, in the in-pipe solidification treatment, a fixed ratio of a solidifying material is added to a fixed flow rate of mud. For this reason, in order to grasp whether soil and sand are sent in a fixed amount,
It is necessary to equip a flow meter, etc., while checking the quantitative mud sending. However, depending on the type of soil and water content, the flow rate of the mud varies greatly, so the rotation speed of the screw feeder is adjusted to secure the planned set amount of mud. Limited, it may be difficult to maintain the planned soil volume.

Further, the screw feeder and the centrifugal pump used in the mud feeder are not commercially available and are manufactured with special specifications. The production cost is extremely high and is not versatile.
Furthermore, there is a problem in that a soil with a lot of sand causes severe wear of a screw feeder and a casing, and a running cost such as repair and replacement is required.

An object of the present invention is to provide an in-pipe solidification treatment apparatus and a construction method using a reciprocating pump, which solves the above-mentioned various problems, and which employs a reciprocating pump.

[0011]

A reciprocating pump (such as a piston type concrete pump) is a machine for efficiently feeding mud to sandy soil or clay having a low water content. The reciprocating pump is
In general, as represented by a concrete pump, gravelly soil
Hints, low water content, can be viscous to easily transport the high go Nkurito. These pumps have many achievements and are widely used from stationary type to portable type. The mud pumping capacity of such a reciprocating pump ranges from 30 m ³ / H to 100 m.
It is up to about m ³ / H and can be easily adjusted as a general-purpose product. Such a reciprocating pump is operated by hydraulic pressure, can generate a strong thrust, and has a wide adjustment range with respect to a load on the pump due to a change in soil quality.

According to the present invention, by equipping the reciprocating pump sediment hopper lower portion of the apparatus of the pneumatic feed system, it is conveyed stably from soft viscous soil to clay sandy soil and low water content, It is possible to solve the above-mentioned problem with the change in soil quality.

Generally, the flow rate of the reciprocating pump can be calculated by multiplying the diameter of the cylinder by the piston stroke and the reciprocating speed of the piston, and then multiplying the efficiency of taking mud into the cylinder. However, depending on the type of mud, the efficiency of taking mud into the cylinder changes, or the mud feeding capacity decreases.

According to the present invention, a sensor capable of detecting the reciprocating speed of the hydraulic piston is attached to constantly grasp the flow rate of the reciprocating pump. it can. At this time,
Although it is necessary to change the intake efficiency according to the type of mud and the change in the water content, it can be adjusted at the time of calculation with reference to the intake efficiency obtained by changing various soil properties and the water content in advance.

Further, by providing a flow meter (electromagnetic flow meter or the like) in the mud pipe after the pump mud feeding, the flow rate of the pressure fed through the mud pipe is measured and calculated from the speed sensor of the hydraulic piston. It is possible to grasp the more accurate flow rate of the mud by checking the flow rate and the flow rate. That is, the difference between the flow rate measured by the electromagnetic flow meter and the sludge flow rate calculated from the speed measured by the piston speed sensor is calculated, and the intake efficiency can be confirmed and adjusted together with the existing data.

Further, in order to maintain the planned set sludge flow rate, it is necessary to constantly change the piston stroke of the reciprocating pump and / or the reciprocating speed of the piston. According to the present invention, the flow rate of the mud is constantly monitored by the electromagnetic flow meter attached in the middle of the above-mentioned mud feed pipe, the difference from the planned flow rate is calculated, and the hydraulic piston is adjusted to the target mud flow rate. By providing a system that automatically changes the stroke and / or speed of the vehicle, stable mud feeding can be achieved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an in-pipe solidification apparatus using a reciprocating pump according to the present invention and employing an air pressure feeding system. This in-pipe solidification treatment apparatus basically includes a reciprocating pump 10
Solidification material injection device 12, compressed air injection device 14,
And an in-pipe kneading device 16. The reciprocating pump is of a stationary type, and FIG. 2 shows its basic structure.
(A) is a front view, (B) is a plan view, (C), (D) is a switching state diagram of the swing tube. This reciprocating pump includes two hydraulic cylinders 20, 22, in each of which a piston 24 and a piston rod 26 are provided.
The discharge port of the cylinder is connected to the swing pipe 28 by switching.
In FIG. 2A, A indicates the diameter of the cylinder, and S indicates the piston stroke. The discharge port of the cylinder and the oscillating pipe are in the hopper 30, and the oscillating pipe is connected to the mud feeding pipe 32. When one of the cylinders is taking mud in the hopper, the other cylinder is connected to the rocking pipe and sends the mud to the mud pipe. Such a reciprocating pump is known, and is generally used as a concrete pump as described above.

In FIG. 1, a solidification material injection pipe 34 is connected to the mud feeding pipe 32, and further, a compressed air injection pipe 36 is connected to the mud feeding pipe 32. The mud feed pipe 32 is provided with a check valve 38 for preventing compressed air from flowing back.

The in-pipe kneading device 16 uses, for example, a line mixer disclosed in Japanese Patent Application No. 10-91447 filed by the present applicant. FIG. 3 is a diagram showing this line mixer. FIG. 3A is a perspective view of an in-pipe kneading apparatus,
(B) is an explanatory view of a curved tube as a component thereof. The in-pipe kneading device includes a U-shaped curved pipe 11 (for example, an 18 pipe pipe).
A plurality of 0-degree bend pipes are used and connected in various directions. Further, one end of the connected curved pipe and the other end thereof are connected to the upstream end and the downstream end of the mud feed pipe via two L-shaped bent pipes 13, respectively. The curved pipes are connected to each other in a meandering manner by connecting bolts with connecting flanges 11a provided at both ends of the bent pipes.

In the apparatus for solidification in a pipe constructed as described above, for example, dredged mud piled up on the earth carrier 72 is pumped up by the backhoe 40, thrown into the hopper 42, and provided with the screw feeder provided at the lower part of the hopper. The liquid is continuously discharged to the hopper 30 of the reciprocating pump through the gate 44 and the gate 46 whose opening and closing can be adjusted. The mud in the hopper 30 is continuously sent out to the mud feed pipe 32 at a constant flow rate by the reciprocating pump 10.

Solidified material is injected into the mud sent from the reciprocating pump 10 from the solidified material injection device 12 at a flow rate commensurate with the amount of mud fed , and compressed air is injected from the compressed air injection device 14 to form mud. Is inside the mud pipe by compressed air
Will be pumped . Pressure pumped been mud reaches the tube mixed kneading apparatus 16 while mixing with the solidifying material in kneading effect by plug flow is promoted occurring Okudoro tube, forcibly mixed kneading
After that it has been, is released as a solidified treated soil to the destination is de-energized in a cyclone 48.

As an example, the distance of the sludge pipe from the reciprocating pump 10 to the position where the solidified material is injected is 6 m, and the distance of the sludge pipe from the position where the solidified material is injected to the position where the compressed air is injected. Is 2 m, the distance of the mud pipe from the position where the compressed air is injected to the in-pipe kneading device 16 is 700 to 800 m,
The distance of the mud feeding pipe from the pipe kneading device 16 to the cyclone 48 is 150 m.

The reciprocating pump 10 must perform constant flow mud feeding by adjusting the stroke and / or the reciprocating speed of the piston, and the solidified material matches the flow rate of the mud flowing through the mud pipe. Volume must be injected. This is the amount of mud that the reciprocating pump sends out,
The flow rate of the mud flowing through the mud pipe and the flow rate of the solidified material injected must be measured and controlled.

FIG. 4 shows a measurement management system for this purpose. As shown, the reciprocating pump 10 is provided with a sensor 50 for detecting the piston speed, the mud pipe 32 is provided with an electromagnetic flow meter 52, and the solidified material injection device 12 is provided with a solidified material flow meter 54. The values measured by these sensors and the flow meter are sent to the computer 56 in the calculation control room. The computer 56 calculates the flow rate of the reciprocating pump by multiplying the reciprocating speed of the piston detected by the sensor 50 by the diameter of the cylinder and the piston crosstalk. The difference between the calculated flow rate of the reciprocating pump and the flow rate of the muddy flow measured by the electromagnetic flowmeter is calculated, and the stroke and / or the reciprocating speed of the hydraulic piston are controlled so as to match the target set flow rate. In addition, the computer controls the injection so that the amount of the solidified material corresponding to the flow rate of the sludge measured by the electromagnetic flow meter 52 is measured by the flow meter 54.

Further, when it is necessary to consider the efficiency of taking mud into the cylinder of the reciprocating pump 10 in accordance with the type of mud and the change in the water content, the density of the mud feeding pipe 32 is increased as shown in FIG. A total of 58 is provided to measure the density of mud,
The computer considers the measured density and refers to the pre-stored capture efficiency corresponding to the soil quality and water content,
Operations can be performed.

Further, as shown in FIG. 4, pressure gauges 60, 62, 6 for detecting the pressure at which the mud is pumped through the mud pipe.
4, 66 are provided in the mud pipe immediately after leaving the reciprocating pump, in the mud pipe after the compressed air is injected, and in the mud pipe before and after the in-pipe kneading device. The pressure of Okudoro tube at these locations is measured, by managing a computer, it is stable operation in the tube solidification apparatus.

FIG. 5 is a view showing another embodiment of the in-pipe solidification treatment apparatus of the present invention. This in-pipe solidification treatment apparatus includes two reciprocating pumps 10a and 10b, and mud pipes 32a and 32b from each reciprocating pump are connected to one mud pipe 32. FIG. 6 shows the vicinity of the connection. Solidification material injection pipes 34a and 34b and compressed air injection pipes 36a and 36b are connected to the mud feeding pipes 32a and 32b from the reciprocating pumps 10a and 10b, respectively. Each mud pipe 3
Check valves 38a and 38b for preventing backflow of the compressed air are provided at 2a and 32b, respectively. Also, at a location near the connection to the mud pipe 32, the valve 70a,
70b are provided respectively.

In FIG. 5, reference numerals 40a and 40b denote backhoes, and reference numerals 12a and 12b denote solidifying material injection devices. According to the in-pipe solidification processing apparatus of the present embodiment, the flow rate of mud feeding can be doubled as compared with the in-pipe solidification processing apparatus of FIG. Also, there is a merit that even if one reciprocating pump breaks down, the other reciprocating pump can be continuously operated.

[0029]

According to the present invention, the following effects can be obtained. (1) By using a reciprocating pump, it is possible to send mud from soft viscous soil to sandy soil and clay having a low water content with high efficiency, and it is possible to send quantitative mud. For this reason, the addition of the solidifying material can be performed at a constant rate, and as a result, a uniform solidified treated soil can be produced. (2) Measure the amount of mud feeding with a flow meter, grasp it, calculate the difference from the measured value to secure a stable planned set mud feeding amount, and automatically adjust the stroke and / or speed of the hydraulic piston By assembling a operable system, reliable operation becomes possible.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an in-pipe solidification treatment apparatus using a reciprocating pump according to the present invention, which is based on a pneumatic pumping method.

FIG. 2 is a diagram showing a basic structure of a reciprocating pump.

3 is a diagram showing an example of a tube mixed kneading apparatus.

FIG. 4 is a diagram showing a measurement management system.

FIG. 5 is a view showing another embodiment of the in-pipe solidification processing apparatus by the pneumatic feeding method using the reciprocating pump of the present invention.

FIG. 6 is a view showing the vicinity of the connection of the mud feeding pipe of FIG. 5;

[Explanation of symbols]

10 reciprocating pump 12 and solidified material injection apparatus 14 compressed air injection device 16 pipe mixing kneading device 20, 22 hydraulic cylinder 24 piston 26 piston rod 28 Yuradokan 30 hopper 32 Okudorokan 34 solidified material injection tube 36 compressed air injection tube 38 Check valve 40 backhoe 42 hopper 44 screw feeder 46 gate capable of opening and closing adjustment 48 cyclone 50 sensor for detecting piston speed 52 electromagnetic flowmeter 54 solidified material flowmeter 56 computer 60, 62, 64, 66 pressure gauge

(56) References JP-A-7-246399 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E02F 3/88 E02F 3/92 E02F 5/04 E02F 5 / 14 E02F 7/04 E02F 7/10

Claims (7)

(57) [Claims] 1. A reciprocating pump for feeding a dredged mud to a mud pipe at a constant flow rate, a solidified material injection device for injecting a solidified material at a constant flow rate in the middle of the mud pipe, and the solidified material is injected. A compressed air injection device that injects compressed air into a mud pipe to pneumatically feed the mud, a kneading device in a tube that kneads the pneumatically fed mud containing solidified material, and a reciprocating piston of the reciprocating pump Dynamic speed and the solidification
Before the material is injected, the flow rate of the mud
From the mud flow rate, the piston of the cylinder of the reciprocating pump
Controls stroke and / or reciprocating speed of piston
A solidification treatment apparatus in a pipe, comprising: 2. The reciprocating pump has two hydraulic cylinders, and when one of the cylinders is taking mud, the other cylinder has a structure for discharging mud. The in-pipe solidification treatment apparatus according to the above. Wherein the measurement management system, pipe during solidification processing apparatus according to claim 1 or 2, wherein the controlling the infusion rate of the solidifying agent. 4. The measurement management system calculates a difference from the planned set mud flow rate, and automatically changes the piston stroke and / or the reciprocating speed of the piston to match a target mud flow rate. 4. The apparatus according to claim 1, further comprising an electromagnetic flowmeter attached to the mud pipe to monitor the flow rate of the mud. 5. The measurement management system according to claim 1, further comprising: a computer for calculating by taking into account the density of the mud and referring to a previously stored intake efficiency corresponding to soil quality and water content. 5. The in-pipe solidification treatment apparatus according to any one of 4. 6. A dredged mud is sent to a mud pipe at a constant flow rate by a reciprocating pump, a solidified material is injected at a fixed flow rate in the middle of the mud pipe, and the mud injected with the solidified material is pneumatically fed. Then, the pneumatically fed mud containing the solidified material is kneaded, and the flow rate of the mud in the mud pipe before the solidified material is injected is measured.
And the speed of the reciprocating pump and the injection of the solidified material.
An in-pipe solidification method characterized by controlling the flow rate . 7. The method of taking mud into the reciprocating pump,
7. The solidification treatment method in a pipe according to claim 6, wherein the in-pipe solidification treatment method is performed by taking into account the measured efficiency of the mud soil and taking in the pre-stored efficiency corresponding to the soil quality and water content ratio.