JPS58120990A - Pumping-up device for water to be pressurized for excavation work - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] At the end of the Ft4 shift, when the pressurized water level is JI &- or in underground construction that involves deep excavation, the excavation progresses! The upward force caused by the pressurized water at the bottom of the IN section becomes larger than the lower force due to the weight of the upper part of the IN section, which prevents bulging of the impermeable layer, such as a clay layer, from pushing upwards. It is used to lower the pressurized water level of the site, and more specifically, a perforated steel pipe is inserted into the ground at the planned excavation location so that its lower end is below the planned #A excavation depth in a vertical position. This invention relates to a water pumping device for excavation work, which is inserted into a pumping well by erecting it, and connects and connects nine drainage pipes and a submersible pump for pumping pressurized water.

The conventional O1m device is simply a submersible pump (04) connected to the lower end of the drain pipe (08) fully inserted into the pumping well (Qjl), as shown in Figure 1. 6 77 lFm1 for excavation work with soil layer cross section such as
Submersible pump (Q4) is used in a fixed location in or near Tokyo.
Therefore, when excavating areas deeper than the pressurized water level, it is necessary to lower the pressurized water level even if it is safe to prevent swollen slabs, so it is necessary to drain water using a pump from the beginning of the excavation. As a result, not only was the cost of pumping up more wastewater than necessary and discharging it into the water supply system being enormous, but the operation and maintenance costs of the equipment also increased, resulting in a high total construction cost.

In view of this situation, we decided to pump up water to the minimum level only at the necessary times to prevent the above-mentioned swell, and to carry out the construction work in a very economically advantageous overall manner. The object of the present invention is to provide a pressurized water pumping device mk for excavation work that can be advanced.

The pressurized water pumping device for excavation work according to the present invention, which was developed to achieve the above-mentioned purpose tS, is the one written by Suga, in which fluid pressure is injected and extracted from the lower part of the pump. P- can be expanded and contracted in the radial direction, and in its expanded shape, f
/TJf! Water flow with an annular tube body t that can tightly fit into the steel pipe mrkJvc and prevent the rise of pressurized water from below! 111-It is a special imitation that devices are installed in series.

In other words, the rise in the pressurized water level at the bottom of the submersible pump can be controlled by arbitrary VCC.
By installing a pumping control device that can stop the pumping, the pump can be turned on at any position as the excavation progresses, and only when it is necessary to lower the pressurized water level to avoid the risk of bulging. By using flJ, the pumping and discharging action of pressurized water can be achieved sequentially at 1 kiA at different locations and times, so the amount and time of drainage can be increased to the minimum required, and the cost of discharging wastewater can be reduced. Through the combination of possible savings and possible savings in operation and maintenance costs, we have been able to significantly reduce the total construction cost. In addition, the equipment* can be installed at any location in the pumping well.
Since water can be pumped by stopping at the δ1 position, it can be used even if the targeted pressure-retaining layer is a side layer, increasing the ability of the device to withstand the soil layer. By doing so, it is possible to easily change the upper and lower ml of the 5kii11, and there are no problems in terms of overall efficiency or operation in actual work due to the existence of the pumping device as described above.

Hereinafter, implementation of the present invention will be described in detail based on 2@ jail #. As shown in FIG. Jll impermeable layer (b,) such as clay layer, second pressured water retention layer (lL),
a third impermeable layer (b), an eighth pressured water retention layer (13), and
The third impermeable layer (bρ) is located at an arbitrary underground location of the planned excavation site (usually in the center of the construction area), where water is cut off using sheet piles, etc., in the ground of the assumed soil layer cross section. ) K Using an earth drill etc. not shown in the diagram, holes are drilled in the vertical hole up to or near the 8th impermeable layer (BL), which is the planned drilling S degree, and a number of holes ( 1m)...tW steel pipe (1) is inserted and erected in a vertical position so that its lower end is above the third impermeable layer (bs>), and the steel pipe (1) is inserted into an external vertical hole. Ballas T91 inside
i Filled, and 17] Each impermeable layer (b + door (b-・(
A pumping well (2) is made of gold by filling the vertical hole part of the steel pipe IIJ outside - corresponding to - with clay or mortar, and a drainage pipe (3) is inserted from above into this pumping well (2). ), the pressure water pump +417 is connected to the lower end of the IIJ k pump (417) as shown in Figures 8 to 5. ) from the lower end of the
ll is fixed and extended, and a disc ll uniform and Qlt with a diameter slightly smaller than the IFI marked steel pipe fi + inner diameter is fixed with a lowering motion located opposite to each other at an excessive interval of 7 below this shaft-like g M tllllllll bottom stop, and this upper and lower Opposing disk 114 'α'41m
1. It can be expanded and contracted in the radial direction with the injection and withdrawal of hydraulic or pneumatic pressure, and its expansion shape is as shown in Fig. 4! ! 'rInside the steel pipe (1)! ! Pressurized water rises from below in close contact with IIIjo t-111i stop CI
The pumping control device (6) is constructed by sandwiching 1 llt of a large rubber annular tube body.
1 is a pipe for injecting and extracting hydraulic or pneumatic pressure into the annular tube body III, and a compressor is connected from the ground surface via a pipe (I417) directly above the upper disk. The compressed air to be blown into the well (!j) is
2) The slime inside the tank is mixed with underground water and stirred thoroughly to make the slime into sewage, which is then pumped out.

The 6th problem ~ P) is a step-by-step KID excavation work of the hypothetical soil layer cross section similar to that shown in the head of wI using the device of the present invention.
This figure shows the pumping status of N rows in order, and by adopting this pumping process, the amount of pumped water (sewage discharge amount) 1-1 can be significantly reduced compared to the conventional method.

[Brief explanation of the drawing]

The inner surface shows implementation 1 of the pressurized water pumping device for excavation work according to the present invention.
Rt1 is shown in Fig. 1, a schematic longitudinal section showing the state of water pumped by the conventional device, and Fig. 2 shows the state of pumped water S by the device of the present invention, 1 ml.
Schematic vertical cross-sectional view 1 shown in t, vertical cross-sectional view of JIB map ri 11 part,
Figure 4 is an enlarged vertical sectional view of the main part, Figure 5 F'i Figure 4 V-
The V-line cross-sectional view, Fig. 6, J-PM, is a diagram of stepwise water pumping using the device of the present invention. [11... Perforated steel pipe, (2)... Pumping well, ill 2... Cultivation pipe, (4)...
・・Submersible pump, ill・・・・Annular Thug body,
(6)... Pumping control device, t71...
Compressed air outlet.

Claims (1)

[Scope of Claims] ■ Constructed by inserting and erecting a perforated steel pipe (1) into the ground at a planned excavation location in a top and bottom view 11 with its lower end extending to a planned depth of m. Pressurized water pumping am for excavation work inserted into the pumping well (1) and connected to the lower end of the drain pipe i11 to the submersible pump (4) 1 for pumping pressurized water.
In the lower part of the pump (4), there is a shaft which can freely expand in the radial direction for fluid pressure injection and extraction, and in its expanded state it comes into close contact with the RSM inside the cocoon steel pipe (1). An annular tube body (pumping control bag 11+ having -1 section) capable of restraining the rise of pressurized water from the lower part. ■ The pumping control device (・) is equipped with an opening (7) that blows out compressed air into the well (!) located directly above the pumping device (・). The described aregia water pumping device for excavation work.