JPH05280280A - Force feed pump device for construction work - Google Patents

Abstract

PURPOSE:To prevent deterioration of working efficiency as possible when blocking phenomenon is generated in force feed pump devices by grasping the generation positions and degree of blocking so as to enable exact response. CONSTITUTION:Vibration meters 35, 35,... are provided in positions of pumps P2-Pn where blocking may be generated and a mud drain pipe 25. Output of the vibration meters 35, 35,... are monitored by a central monitoring board 31. When the detected value of normal operation is changed, it is grasped that blocking is generated in the vicinity of the vibration meter outputting the change. Further, degree of blocking can be recognized from speed, acceleration, or the like of vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-feed pump device, and more particularly to a pressure-feed pump device for transferring muddy water in civil engineering construction work.

[0002]

2. Description of the Related Art An example of a conventional pressure pump device will be described with reference to FIG. The figure shows the equipment configuration of the tunnel excavation work by the muddy water shield method. Reference numeral 1 is a muddy water treatment plant, 2 is a shield machine, and 3 is a central monitoring panel. The mud water produced in the mud water treatment plant 1 is pressure-fed in the mud pipe 5 by the variable speed mud pump 4 and is supplied into the shield chamber in front of the partition wall 6 of the shield machine 2. A water flow meter 7 and a water density meter 8 are attached to the mud pipe 5, and the respective data are fed back to the central monitoring panel 3.

The mud water in the shield chamber is returned to the mud water treatment plant 1 through the mud pipe 11 by the variable speed mud pump 9 and constant speed pumps 10, 10 ... Which are connected in series at appropriate intervals according to the discharge capacity. To do. The sludge pipe 11 is provided with a drainage density meter 12 and a drainage flowmeter 13. The change of the flow velocity and pressure of the muddy water is controlled by changing the rotational speeds of the variable speed mud feed pump 4 and the variable speed mud discharge pump 9 by the central control panel 3.

[0004]

There is a case where the pump and the pipeline of the pumping pump device are blocked by foreign matter in the fluid and the transfer function becomes abnormal. For example, in the case of the muddy water shield construction method, when muddy water and boulders, driftwood, metal materials, etc. mixed in excavated earth and sand in a certain amount or more are taken into the pumping pump device, these foreign matters are caught between the blades of the pump. There is a possibility that the mud flow rate will be reduced or the mud will not be able to be discharged at all due to clogging of pipes or pipelines. In such a case, it becomes difficult to control the internal pressure of the face during excavation, which hinders the performance of the work. Therefore, it is necessary to dismantle the pump and the mud pipe to remove the blocked foreign matter.

However, conventionally, it has been necessary to empirically determine the occurrence of the blockage phenomenon from the measured values of the rotational speed of the pump and the flow rate, and whether the blockage is transient or requires the work of removing foreign matter. It is difficult to recognize, and it is also difficult to identify the blockage site, and it takes time to release the blockage, resulting in a significant decrease in work efficiency. Therefore, when the flow condition in the pressure-feeding pump device and a blocking phenomenon occur, a technical problem to be solved has occurred in order to easily determine the blocked location and prevent a decrease in work efficiency. ..
The present invention is intended to solve the above-mentioned problems.

[0006]

The present invention is proposed in order to achieve the above-mentioned object, and a vibrometer is provided in one or both of a pump and a pipe constituting a pumping pump device. The present invention provides a pumping pump device used for construction work, which can determine the occurrence of a blockage phenomenon in the pumping pump device and the blockage point from the measured value.

[0007]

[Function] The vibration state of the pump or the like is recognized by the vibrometer provided in the pump or the pipe. If the acceleration and amplitude of vibration during normal operation are known in advance, the occurrence of blockage can be detected from changes in vibration, and the blockage point can be specified from the location where the vibrometer is installed. In addition, if the vibration at the time of partial occlusion or complete occlusion is grasped by experiments or construction results, the degree of occlusion can be grasped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, technical matters that are conventionally known will be described at the same time. Muddy water treatment plant 21 shown in FIG.
And the shield chamber shielded by the partition wall 23 of the shield machine 22 are connected by a mud pipe 24 and a mud pipe 25. The mud pipe 24 has a variable speed mud pump P
₁ , a water flow meter 26, and a water density meter 27 are inserted, and a pressure detector 28 for detecting the water pressure of the face is provided near the shield machine 22.

A variable speed sludge pump P ₂ , a constant speed pump P ₃ , ... P from the shield machine 22 side to the sludge pipe 25.
_n , a drainage density meter 29 and a drainage flowmeter 30 are provided.
Flowmeters 26, 30, density meters 27, 29 and pressure detector 2
The detected value of 8 is input to the central monitoring board 31. The central monitoring board 31 controls the control boards C _{1 to} C _{n of} the pumps P _{1 to} P _n , the automatic valves 32 and 33, and the automatic bypass valve 34 based on the set value and the input detected value.

The rotary bearings of the pumps P ₂ , P ₃ , ... P _n and the vibrometers 35, 35 ... Are installed at arbitrary points of the sludge pipe 25, and the outputs thereof are connected to the central monitoring board 32. The degree of vibration can be monitored on the ground. The vibrometers 35 and 3
A speedometer or an accelerometer is used as 5 ... Then, each vibrometer 3 in advance in a normal sludge discharge state
The detection values of 5, 35, ... Are grasped so that the degree of blockage can be judged based on the vibration velocity or vibration acceleration.

When the mud sending command is output from the central monitoring board 31, the mud sending automatic valve 32 and the mud discharging automatic valve 3 are provided.
3, the variable speed mud pump P ₁ , the variable speed mud pump P _2, and the constant speed pumps P ₃ , ... P _n are activated, and are placed in the shield chamber closed by the partition wall 23 of the shield machine 22. The muddy water is injected, and at the same time, the muddy water is returned to the muddy water treatment plant 21.

The central monitoring board 31 controls the amount of sludge sent by the variable speed mud pump P _{1 and} the amount of sludge discharged by the variable speed mud pump P _{2 so} as to control the water pressure of the cutting face to be constant. Due to excavation of the shield machine 22, foreign matter such as cobbles is mixed in the muddy water discharged from the variable speed sludge pump P _2, and the foreign matter is clogged in the gap between the blades of the pumps P _{2 to} P _n of the sludge pipe 25. Then, the rotational balance of the impeller is deviated, the discharge flow rate becomes uneven, and abnormal vibration occurs in the pump, which increases the speed and acceleration of vibration.

Also, when foreign matter is clogged in the sludge discharge pipe 25, the speed and acceleration of vibration change. When it is completely blocked, the flow of muddy water is stopped, so that the vibration is reduced from the normal state, and the speed or acceleration of the vibration may be reduced.
These vibration changes can be recognized by the central monitoring board 31, and the location where the blockage occurs can be identified from the installation location of the vibrometers 35, 35 ... Also, after the rotation speed of the variable speed sludge pump P ₂ is automatically increased, the vibration meter 3
When the detected values of 5, 35 ... Return to normal values, it can be seen that the blocked foreign matter has been eliminated by the flow. If the foreign matter is not removed or if it is completely blocked, the mud sending and discharging is stopped, and the foreign matter is removed by disassembling the identified blocked location.

The present invention can be variously modified without departing from the spirit of the invention, and it goes without saying that the invention extends to those modifications.

[0015]

As described in detail in the above one embodiment, the present invention is capable of ascertaining the location and degree of blockage of the pressure pump device. Therefore, when a blockage occurs, it is possible to take appropriate corrective measures without relying on experience or intuition, eliminate the fear of wasting labor and time, and contribute to the prevention of reduction in work efficiency.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a pump pressure feeding device of the present invention.

FIG. 2 is a configuration diagram of a conventional pump pressure feeding device.

[Explanation of symbols]

 21 Muddy Water Treatment Plant 22 Shield Machine 24 Mud Pipe 25 Muddy Pipe 31 Central Monitoring Panel 35 Vibrometer

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[Procedure amendment]

[Submission date] April 14, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010] The pump P _2, P _3, ... and rotation bearing of P _n, established the vibrometer 35 ... in any point of the Haidorokan 25 connects its output to the central monitoring panel 3 1 , You can monitor the degree of vibration on the ground. The vibrometers 35 and 3
A speedometer or an accelerometer is used as 5 ... Then, each vibrometer 3 in advance in a normal sludge discharge state
The detection values of 5, 35, ... Are grasped so that the degree of blockage can be judged based on the vibration velocity or vibration acceleration.

Front page continuation (72) Inventor Yukio Iizawa 3-21 Kanda Sakumacho, Chiyoda-ku, Tokyo Toyo Kogyo Co., Ltd. (72) Inventor Hiroshi Nishino 3-21 Kanda Sakuma-cho, Chiyoda-ku, Tokyo Toyo Kogyo Co., Ltd.

Claims (1)

[Claims] 1. A vibrometer is provided on one or both of a pump and a pipe constituting a pressure-feed pump device so that the occurrence of a clogging phenomenon and the clogging point in the pressure-feed pump device can be determined from the measured value of the vibrometer. A pressure pump device used for construction work.