JPS5826191A - Mud leakage prevention in shield engineering method - 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 The present invention relates to a method for preventing slippage of mud in the V-Rudoey method, and more particularly to a mud water pressure shield method.

The mud water pressurized shield construction method uses a mechanical digging shield machine and a bulkhead is installed behind the cutter! By blocking the shield front, filling the space between the iFJ blade and the bulkhead (hereinafter referred to as the chamber) with muddy water, and making the muddy water pressure slightly higher than natural water pressure, we prevent water from springing up and the face from collapsing. While I was writing, I was at the face! llll! IIt' is carried out, and ±- is a construction method in which fluid is transported outside the mine using a mud drainage pipe.

This mud water pressurized shield construction method is safe because it can be operated under atmospheric pressure and has many advantages such as the ability to transport excavated soil with fluid.

It is economical and easy to construct, and the number of construction projects using this method is steadily increasing.Furthermore, recently, the ground conditions have become more severe, and it has even been applied to gravel ground mixed with boulders and cobbles, which was considered difficult in the past. Applied.

However, depending on the conditions in which this type of ground forms, it is not self-sustaining and often has extremely high water permeability, so slippage due to its high 70' water permeability often becomes a problem. In the event of a slippage.

It became difficult to maintain the mud water pressure to counter the collapse force of the ground.
Sand and gravel soils that are not self-supporting often lead to collapse.

As a countermeasure to this problem, water glass-based or cement-based chemicals are injected into the cross section of the shield passage section or the shield crown to improve the ground for spinning mud. It requires cost and construction time. In addition, if these chemicals are injected into a glued face during excavation, the chemicals may adhere to skin spray or cause damage to the inside of the chamber.
There is also a problem with the inside of the shield plane.

The present invention has been made in order to eliminate the above-mentioned problems of the muddy water pressurized shield construction method, and to provide a mud slipping prevention method that can reduce construction costs and shorten the implementation period by improving mud slipping areas in a short time. The method for preventing sludge loss in the equipment is to use the muddy water pressurized shield construction method by injecting 1m21 of highly absorbent water and oil into the wJ wing or chamber. The resin absorbs pore water and muddy water in the ground and swells to form a gel, thereby clogging the areas where mud is lost and preventing mud from slipping out.

By the way, if high water absorbency** is used when disposable diapers or pharmaceutical sludge is removed, just a small amount will clog the sludge area, stop the sludge, and maintain the mud water pressure in the chamber. I found out something strange. Furthermore, unlike water glass-based or cement-based chemicals, the gel after water absorption has almost no strength (-axial compressive strength qva * 0 Kvt/d
) Ninth, even if it adheres to the skin plate or flows into the chamber, there is no problem with shield digging.

In addition, when a large amount of superabsorbent resin flows into the chamber, increasing the viscosity in the chamber and impeding the fluid transport of sediment during circulation of muddy water, electrolyte (Mail e
*a@4, etc.) Water W! By adding a small amount of IW1, the gel can be released in a few minutes and its viscosity can be reduced.

The superabsorbent resin used in the present invention refers to a resin that swells several times to nearly 1,000 times when it absorbs water, but does not dissolve in water. Combined partial hydrolyzate, polyethylene nitrile, partial hydrolyzate of vinyl ester-ethylenically unsaturated carboxylic acid copolymer, sulfonated styrene group, olefin-based vol w-, polyethylene oxide Suido, polyvinyl alcohol, polyvinylvinyl vinyl chloride, polyacrylic acid soda, polyacrylic acid luer, and lupooxymethylcellulose.

Pocket acrylic acid soda Pocket acrylic acid copolymer body,
Radiation-irradiated products of aqueous polymer compounds such as pullulan;
Examples include those in which a portion of the hydrophilic group is substituted with a simple Il group, a copolymer of inobutylene and maleic anhydride, and the like.

By the way, it is difficult to send these powdered substances through pipes into muddy water in the ground, and there are problems such as getting stuck in the pipes or coming into contact with water near the injection ports and blocking the injection ports. be. Therefore, by combining highly absorbent 511m and -mono and making it into a slurry, it is easy to transport in pipes, and it is possible to prevent the resin particles from rolling up and forming a coating, and from clogging due to contact with water near the injection port. Possible - When sludge occurs in a pressurized mud water shield, sludge can be prevented by directly injecting this water into the sludge area or chamber from within the shield machine. This study improves the safety of the face, and also improves the safety of the face.
Since it is possible to omit the chemical injection process which required a large amount of cost and construction time, efficient and economical construction becomes possible.

The 1st ml shows a mud water pressurization type shielding machine, and when the cutter 1 reduces the mud to 111%, the mud is fed into the chamber 2, the mud is sent from the mud pipe 3, and the agitator 4 removes the mud and soil. Stir and #mudtube! The soil is transported by fluid. Regarding other points.

Since there is no particular difference from conventional shield machines, details will be omitted.

When the muddy water that has now filled the chamber ZK evaporates further into the chamber 8 and the water pressure inside the chamber 2 decreases, the excavation is stopped, the mud feeding 3 and the mud removal 1 are stopped, and water absorbing material is injected through the injection port. Water is injected from the injection port 6, and the water #9 is injected into the gap 11 in the gravel layer S.
It penetrates into the pore water 1-1 and gels in a few minutes, so it can stop the sludge loss in the area indicated by 9. 6.Next, the mud is fed from the mud pipe 3 to confirm the effectiveness.Unimproved. If there is a part io and the sludge does not completely stop flowing out, inject the water-absorbing material into the rechamber via the injection lower while feeding the sludge. The viscosity of the muddy water flowing inside the chamber 2 increases due to the water-absorbing material, so the amount of sludge is reduced, and the swollen gel fills up the gaps in the portion 10, so that the sludge is completely evacuated after several minutes to several tens of minutes. can be stopped.

FIG. 3 shows an example of an injection device for injecting water-absorbing material into a steel container.

Injection hose x I by air pressure from Compressuna 12
Nk, 'Cm 1 Forcefully feed the water absorbing material to the water absorbing material inlet of the muddy pressurized shield machine shown in Figure 1.

Example 1, Water Absorbing Material Blend 3, Results As can be seen from the above explanation, the present invention has extremely excellent effects, and the points will be listed below.

(1) Water-absorbing material can be directly injected from inside the shield machine without the need for work on the ground.

(2)) Since the lost mud spots can be improved in a short period of time, recovery is quick and the speed of koji production can be increased.

(3) High hydrophilic tree II absorbs hundreds of times more water, so it is economical because the amount of injection is small.

(4) Since this water-absorbing material does not solidify, even if it adheres to the skin plate or flows into the chamber, there is no problem with the advancement of the shield, and on the contrary, it has the effect of reducing the agitator torque.

In the unlikely event that fluid transportation of earth and sand is disrupted, Nacj
a The swollen gel can be dissolved by adding an aqueous solution such as Cmel@.

+5)! The water-absorbing material can be injected with a simple device without requiring any special pump or injection device.

(6) A water-absorbing resin is injected into the voids of the gravel layer without connectivity, gels, and prevents the gravel layer from falling.

(7) The voids in the gravel layer, etc., which are prone to sludge, are filled to prevent sludge and waste of company funds.

(8) The water-absorbing resin injected from inside the chamber is easily removed by the circulation of muddy water and does not affect the functionality of the muddy water shield method.

(9) Filling the chamber with water-absorbing resin prevents dirt and gravel from falling through the gaps and slits of the cutter plate.

(m) If more water-absorbing resin is injected from inside the chamber, it will come out from the slits or gaps in the drawing board.

It penetrates into the gaps in the easily collapsed layer of the front face of the shield machine, such as the middle sand layer, and stabilizes the face.

(U) Water-absorbing resin has no strength even if it gels, so it does not have a negative effect on the drive of the shield excavator.

(b) As mentioned above, it has rather lubricating properties, so it is useful for reducing frictional resistance.

(b) If the ground medium pressure shield injected with water-absorbing resin is miswritten, vibration will be applied, and the resin, which has not yet been sufficiently lc'lk-watered, will react and destroy the collapsible gravel layer just before the face. Keep it in place to get stable digging effect.

(b) When using the muddy shield method in which water is injected into the ground, 4i fat is mixed into the muddy water used, increasing its viscosity and further contributing to the stability of the face.

(b) Water absorbency
! Even if you inject it after one bird has collapsed, you can expect a significant effect.

(b) There is no pollution.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pressurized muddy water shielding machine to which the method for preventing sludge of the present invention is applied, and FIG. 2 is a piping diagram of an injection device for injecting water-absorbing material. l...-p tube-2...chamber 3 tube 6
．． 7... Inlet for water absorbing material 8... Gravel layer 11--
Steel container 12-Φ Compressor 13... Injection hose Patent applicant Kajima Corporation

Claims (1)

[Claims] In the shield construction method, a superabsorbent resin made by mixing a superabsorbent resin and oil is injected into the face or chamber during shield excavation, and the superabsorbent resin is produced. A method for preventing sludge in shield construction method 11C, which is characterized by clogging the area of sludge by absorbing water or mud in the ground and causing it to swell and form sludge, thereby preventing sludge.