JP2000291386A - Damper device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a damper device capable of smoothing a pumping pressure of conveyed excavated earth and sand and uniforming a pumping speed. SOLUTION: A cylindrical body 314 having an opening 315 for pressure adjustment on a peripheral surface, the cylindrical body being a transport path for excavated earth and sand, and a cylindrical body 31.
And pressure smoothing means provided on the outer peripheral side of 4 for absorbing and smoothing the pressure of the excavated earth and sand. The pressure smoothing means is provided with a sediment inflow chamber 316 into which excavated sediment flows from the opening 315, and is separated from the sediment inflow chamber 316 and the pressure adjusting wall 312, and presses the excavated sediment via the pressure adjusting wall 312. And a pressure adjusting wall 312
Is configured to expand toward the pressurizing chamber 318 when excavated earth and sand flows into the earth and sand inflow chamber 316, and expand toward the earth and sand inflow chamber 316 when the pressurizing chamber 318 is pressurized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for smoothing the pressure of intermittently pumped excavated earth and sand and uniforming the pumping speed.

[0002]

2. Description of the Related Art When a non-liquid such as excavated earth and sand is transported using a pipe, a pump such as a piston pump is used to obtain a sufficient pumping force. However, the piston pump intermittently feeds pressure, and can take two states, a pressurized state and a non-pressurized state. Therefore, the pressure difference between the excavated earth and sand conveyed in the pressurized state and the non-pressurized state increases.

[0003] In this pressurized state, an impact force higher than usual is generated in a pipe through which excavated earth and sand is pumped, and a weak portion such as a joint portion of the pipe may be damaged. In addition, such intermittent conveyance sometimes causes noise or the like. In particular, when the transport path is closed, such a problem is likely to occur.

In addition, when a solidifying agent is introduced into solidified excavated soil for the purpose of classifying on the ground and solidified, the difference between the pumping pressure and the pumping speed of the excavated sediment in a pressurized state and a non-pressurized state is large. Is not evenly mixed with the excavated earth and sand and cannot be properly solidified. For this reason, it is preferable to smooth the pressure of excavated earth and sand, etc., and to make the pumping speed uniform before adding the solidifying agent.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a damper device capable of smoothing a pumping pressure of excavated earth and sand and making the pumping speed uniform. It is in.

[0006]

In order to solve the above-mentioned problems, a damper device according to the present invention is provided on a conveying path of excavated earth and sand conveyed intermittently, and controls a pumping pressure and a pumping speed at the time of excavating earth and sand conveyance. A damper device for adjusting, wherein the excavated earth and sand transport path, a cylindrical body having an opening for pressure adjustment on the peripheral surface, provided on the outer peripheral side of the cylindrical body, the pressure of the excavated earth and sand Pressure smoothing means for absorbing and smoothing, the pressure smoothing means comprising a sediment inflow chamber and a pressurized chamber partitioned by a telescopic pressure adjusting wall, The inflow chamber receives excavated earth and sand from the opening, and the pressurizing chamber pressurizes the excavated earth and sand through the pressure adjusting wall.

The excavated earth and sand that is intermittently pumped by a piston pump or the like may cause damage to the earth and sand transportation path, noise, and the like. In particular, when the transport path is closed, these problems are likely to occur. If it is a liquid, it can be adjusted by drawing it into a path different from the transport path, but this method cannot be applied to a solid such as excavated earth and sand.

According to the present invention, the pressure of excavated earth and sand can be smoothed in real time on the same path as the transport path, and the pumping speed can be made substantially uniform by smoothing the pumping pressure. Thereby, even if the transport path is closed, the destruction of the earth and sand transport path and the occurrence of noise and the like can be prevented.

Further, it is preferable that the damper device includes a pressurizing control section for controlling pressurization in the pressurizing chamber.

According to this, by controlling the pressurization,
Even if the pressure of the excavated soil changes suddenly, the pressure can be quickly adjusted.

It is preferable that the damper device is excavated by a shield machine and smoothes the earth pressure of excavated earth and sand which is pumped by a piston pump.

In particular, in the mud pressure shield method, a piston pump is used for pumping the earth and sand, and the pumping by the piston pump easily causes breakage of the earth and sand conveying path due to a change in the pumping pressure and the pumping speed, noise, and the like. In particular, in a closed conveyance path, problems such as a water hammer phenomenon and noise are likely to occur.

According to the present invention, since the earth pressure can be smoothed and the pumping speed can be made uniform, even if the sand is pumped by the piston pump, the earth and sand transport path can be broken and noise can be reduced. Occurrence can be prevented.

Further, it is preferable that the damper device supplies the excavated earth and sand which has been smoothed toward the solidification system in the transport path.

According to this, since the pressure is smoothed and the pumping speed is uniform, a solidifying agent or the like can be evenly mixed with the excavated earth and sand, and even when the excavated earth and sand is solidified, it can be solidified well.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a description will be given of an example in which a damper device according to the present embodiment is used in a solidification transfer system in a mud pressure shield method.

FIG. 1 is an overall view of a solidification transfer system according to the present embodiment.

The mud pressure shield method employs a shield machine 34.
This is a method of constructing the tunnel 36 while excavating the face 46 and transporting the earth and sand excavated by the mud discharging facility 8 to the ground.

Specifically, the shield machine 34 includes a face 46.
A cutter disk 40 for excavating the soil, a partition wall 45 for preventing the excavated earth and sand from entering the tunnel 36, a chamber 44 between the cutter disk 40 and the partition wall 45, and agitating the sediment taken in the chamber 44. It is configured to include a stirrer 41 and a screw conveyor 42 that supplies the excavated earth and sand in the chamber 44 to the sludge discharging facility 8.

The sludge discharging equipment 8 includes a sludge discharging pipe 102 which is a path of the excavated sediment supplied from the screw conveyor 42, and a piston pump 108 provided in the discharging sludge pipe 102 to pressurize the excavated sediment and supply the excavated sediment to the ground. And the piston pump 10
8 includes a damper device 100 for smoothing the pressure of the excavated earth and sand intermittently supplied and a γ-ray density meter 106 for measuring the density of the excavated earth and sand that has passed through the damper device 100.

Further, the excavated earth and sand whose density has been measured is conveyed to the ground by adding a solidifying agent by a conveyor group including a plurality of conveyors.

Here, the conveyor group is provided horizontally below the shaft 32 in the excavated earth and sand transport path.
6, a premix conveyor 4, which is a first conveyor device for conveying the excavated earth and sand, into which the solidifying agent is added from the solidifying agent adding device 150 to the excavated earth and sand during conveyance, and the conveying path. The lift mix, which is a second conveyor device provided from the bottom to the top of the shaft 32 to carry the excavated earth and sand conveyed from the premix conveyor 4 and convey the excavated earth and sand while stirring and mixing the excavated earth and the solidifying agent. A conveyor 2 and a lift mix conveyor 2 provided near the upper part of the shaft 32 in the transport path.
And an aftermix conveyor 3, which is a third conveyor device formed with an excavated earth and sand unloading position.

Here, the above three types of conveyor devices themselves and their joints are formed airtight,
The entire transport path from the shield machine 34 to the excavated sediment discharge section is formed as a continuous transport path in an airtight state.

Accordingly, the excavated earth and sand excavated from the ground face 46 by the shield machine 34 is transferred to the excavated earth and sand discharge section provided at a predetermined position above the shaft 32.
The inside of the shaft 6 and the shaft 32 are conveyed in a sealed state without contacting the atmosphere.

Next, the operation of each of the above devices will be described.

FIG. 2 is a functional block diagram of the excavated sediment solidification transport system according to the present embodiment.

First, the excavated earth and sand conveyed from the chamber 44 is pumped through the mud pipe 102 by the piston pump 108.

The excavated earth and sand conveyed intermittently by the piston pump 108 is pulsating, and the damper device 100
Pressure is smoothed. The damper device 100
Will be described in detail later.

After being smoothed, the density of the excavated earth and sand is measured by a gamma ray densitometer 106. This measurement result is sent to control device 110.

By measuring the density of the excavated earth and sand, an appropriate amount of the solidifying agent can be determined. By controlling the amount of the solidifying agent, even if the properties of the excavated earth and sand change,
Appropriate solidification can be performed.

The excavated earth and sand after the density measurement is conveyed to the premix conveyor 4, where a solidifying agent is added. The solidifying agent is added from the solidifying agent storage tank 150 to the solidifying agent feeder 152.
This is performed by supplying the solidifying agent to the premix conveyor 4 via the.

Here, the solidifying agent includes gypsum. According to this, the use of gypsum can shorten the solidification time, suppress the increase in the hydrogen ion concentration index (pH) of excavated earth and sand, and minimize the impact on the environment.

Before mixing the solidifying agent, the damper device 100
By smoothing the pressure of the excavated earth and sand and making the pumping speed uniform, the excavated earth and sand and the solidifying agent can be uniformly mixed using the premix conveyor 4.

Further, the configuration is such that the addition state of the solidifying agent is detected by an addition detecting device 154 provided in the solidifying agent conveying path between the solidifying agent feeder 152 and the premix conveyor 4, and the detection result is sent to the control device 110. Have been. Thereby, the addition state of the solidifying agent can be confirmed, and the addition amount of the solidifying agent can be feedback-controlled.

The excavated earth and sand to which the solidifying agent has been added in the premix conveyor 4 is transported to the lift mix conveyor 2.

The lift mix conveyor 2 is composed of three lift mix conveyors 2-1 to 2-3 as shown in FIG. The lift mix conveyor 2 is provided from the bottom to the top of the shaft 32, and excavated earth and sand is transported in the vertical direction.

In this transportation, the solidifying agent and the excavated earth and sand are sufficiently stirred and mixed. The excavated earth and sand that has been agitated and mixed is transported to the upper part of the shaft 32, where the after-mix conveyor 3
Is solidified, and is discharged to the dump truck 120 from the outlet of the aftermix conveyor 3.

As described above, the transport path for excavated earth and sand is formed as a continuous transport path in an airtight state, and the outlet of the aftermix conveyor 3 is formed as an outlet of the transport path.

[0039] According to this, since it is formed as a continuous transport path in an airtight state, it is possible to prevent the spilling of earth and sand during transport and to eliminate the need for a storage facility such as a hopper. The area can be reduced.

In addition, since no manual operation is required, the transportation can be saved, and the working efficiency and working environment can be improved.

Further, by being formed as a continuous transport path in an airtight state, it becomes possible to transport excavated earth and sand to the excavated earth and sand discharge section in a closed state in the transport path without coming into contact with the atmosphere.

The solidification transfer system using the damper device 100 has been described above. Here, the damper device 100 will be described in detail.

(Explanation of the Damper Device) FIGS. 3A and 3B are diagrams showing the change over time of the pressure of the excavated earth and sand before and after the damper device has passed. FIG. 3A is a diagram before the damper device has passed, and FIG. It is a figure which shows the time-dependent change of the pressure of excavated earth and sand.

As shown in FIG. 3A, the pressure of the earth and sand before the passage of the damper device varies with time. That is, the pressure of the excavated sediment in the pressurized state pressurized by the piston pump 108 reaches the maximum value Pmax, and thereafter the pressure gradually decreases, and after the non-pressurized state of the minimum pressure value Pmin continues for a while, Piston pump 108
, And reaches the maximum value Pmax. This intermittent pumping is repeated by the piston pump 108.

As shown in FIG. 3B, the damper device 1
The pressure of the earth and sand after the lapse of 00 is unified to Pavg, which is an intermediate value between Pmax and Pmin, and there is almost no variation with time. That is, the damper device 100
This smoothes the pressure of the excavated earth and sand. Note that the pumping speed also varies before the passage of the damper device 100, but becomes substantially uniform after the passage of the damper device 100, similarly to the pumping pressure.

Next, the principle that the damper device 100 smoothes the pumping pressure and makes the pumping speed uniform will be described.

FIG. 4 is a side sectional view of the damper device 100 according to the present embodiment.

The damper device 100 is a transport path for excavated earth and sand, and has a cylindrical body 31 having a plurality of openings 315 on its peripheral surface.
And pressure smoothing means provided on the outer peripheral side of the cylindrical body 314 to absorb and smooth the pressure of the excavated earth and sand.

Here, the pressure smoothing means has a pressure adjusting chamber, and the pressure adjusting chamber has a sediment inflow chamber 316 partitioned by a pressure adjusting wall 312 made of an elastic rubber member or the like. The pressure chamber 318 is included.

The excavated sediment flows into the sediment inflow chamber 316 from the opening 315, and the pressurizing chamber 318
The excavated earth and sand is pressurized from the outside of the earth and sand inflow chamber 316 through the inside 2.

Further, the damper device 100 includes a pressure chamber 31
8 includes an air mixing unit 320 that mixes air, and the mixing of air is controlled by the control device 110.

When the pressure of the sediment inflow chamber 316 is higher than that of the pressurization chamber 318 (for example, Pmax), the pressure adjusting wall 312 of the sediment inflow chamber 316 expands in the direction of the pressure chamber 316, and as a result, the excavation in the sediment inflow chamber 316 is performed. The pressure of the earth and sand decreases, and the pressure value becomes Pavg shown in FIG.

Further, the earth and sand inflow chamber 316 is in the pressure chamber 31.
8 (for example, Pmin), air is supplied to the pressurizing chamber 318, the pressure in the pressurizing chamber 318 rises, and the pressure adjusting wall 312 of the sediment inflow chamber 316 expands in the direction of the sediment inflow chamber 316. The pressure in the inflow chamber 316 increases, and the pressure value becomes Pavg shown in FIG.

When the pressure in the earth and sand inflow chamber 316 rises, the excavated earth and sand is pressurized and pushed out of the earth and sand inflow chamber 316 through the opening 315 in the transport direction. At this time, the excavated earth and sand pumped by the piston pump 108 is loosened and easily mixed when mixed with the solidifying agent later.

In this way, even if the pressure of the excavated soil varies, the pressure is smoothed and the pressure shown in FIG.
avg. In particular, by controlling the amount of aeration from the aeration unit 320 by the control device 110, the pressure can be quickly adjusted even when the pressure of the excavated soil changes suddenly. Note that the pumping speed is also uniform, similarly to the pumping pressure.

The cylinder 314 is made of a member having a small distortion. Thereby, even if the earth and sand inflow chamber 316 contracts, the transport path of the excavated earth and sand is secured, and a predetermined amount of the excavated earth and sand can always be transported.

The piston pump 108 is used to transport the excavated earth and sand.
However, the piston pump 108 intermittently conveys excavated earth and sand. Therefore, the pressure of the earth and sand sent from the piston pump 108 is not constant but is in a pulsating state.
Due to the pulsating state, the pumping pressure and the pumping speed of the excavated soil greatly fluctuate. For this reason, even if the solidifying agent is added to the pulsating excavated earth and sand, not only can it not be uniformly mixed, but also in particular, in the case of a closed state, it can cause the transport path to be broken.

Further, the intermittent application of pressure may cause problems such as a water hammer phenomenon and noise.

By applying the damper device 100 according to the present embodiment, the pumping pressure of excavated earth and sand is smoothed,
By making the pumping speed uniform, the solidifying agent can be evenly mixed, and is also effective in preventing failure of the transport path and noise.

As described above, according to the present embodiment, the pressure of the excavated earth and sand can be smoothed by applying the damper device 100 first. By adding the solidifying agent to the excavated earth and sand in this state, the solidifying agent can be evenly mixed and the excavated earth and sand can be satisfactorily solidified.

It should be noted that the damper device according to the present embodiment is not limited to the above-described embodiment, but can be applied to various modifications. For example, the damper device according to the present embodiment is not limited to the mud pressure shield method, but can be applied to various methods for solidifying and transporting excavated earth and sand, such as a mud shield method.

[Brief description of the drawings]

FIG. 1 is an overall view of an excavated sediment solidification transport system according to the present embodiment.

FIG. 2 is a functional block diagram of the excavated sediment solidification transport system according to the present embodiment.

3A and 3B are explanatory diagrams showing temporal changes in pressure of excavated sediment before and after passage of a damper device. FIG. 3A shows temporal changes in pressure of excavated sediment before and after passage of a damper device. FIG.

FIG. 4 is a side sectional view of the damper device according to the present embodiment.

[Explanation of symbols]

 2 Lift Mix Conveyor 3 After Mix Conveyor 4 Premix Conveyor 100 Damper Device 102 Drainage Tube 106 γ-ray Density Meter 108 Piston Pump 110 Controller 150 Solidifier Storage Tank 310 Casing 312 Pressure Adjusting Wall 314 Cylindrical Body 315 Opening 316 Sediment Inflow Chamber 318 Pressurizing chamber 320 Air mixing section

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kounosuke Nakamura 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Ken Construction Co., Ltd. (72) Yoshio Iwai 1-1-7-1 Kyobashi, Chuo-ku, Tokyo Toda (72) Inventor Toshihiro Okumura 1-7-1 Kyobashi 1-chome, Chuo-ku, Tokyo Toda-ken Corporation (72) Inventor Yasuhiko Asai 1-7-1 Kyobashi 1-chome, Chuo-ku, Tokyo Incorporated (72) Inventor Toshiro Saito 1-7-1 Kyobashi, Chuo-ku, Tokyo Toda Takeshi Corporation Incorporated (72) Inventor Satoshi Tabata 1-1-1, Kyobashi, Chuo-ku, Tokyo Toda Takeshi Within the Company (72) Inventor Akio Uraya 3-39-1, Hazawa, Nerima-ku, Tokyo Inside Sun-Ag Co., Ltd. (72) Inventor Masaru Yasukochi 3-39-1, Hazawa, Nerima-ku, Tokyo Sun F-term in A Kogyo Co., Ltd. (reference) 2D054 AC04 AC05 BA07 CA01 DA03 DA15 DA24 DA33 GA58 GA68 GA81 GA95

Claims (4)

[Claims] 1. A damper device provided on a conveying path of intermittently transported excavated earth and sand for adjusting a pumping pressure and a pumping speed at the time of excavated earth and sand transport. A cylinder having an opening for pressure adjustment on the peripheral surface thereof; and a pressure smoothing means provided on an outer peripheral side of the cylinder and absorbing and smoothing the pressure of the excavated earth and sand. The smoothing means is configured to include a sediment inflow chamber and a pressurized chamber partitioned by a stretchable pressure adjusting wall, and the excavated sediment flows into the sediment inflow chamber from the opening, A damper device for pressurizing the excavated earth and sand through the pressure adjusting wall. 2. The damper device according to claim 1, further comprising a pressurizing control unit that controls pressurization in the pressurizing chamber. 3. The damper device according to claim 1, wherein the earth pressure of excavated earth and sand excavated by a shield machine and pumped by a piston pump is smoothed. 4. The damper device according to claim 1, wherein smoothed excavated earth and sand is supplied to a solidification system in the transport path.