JPH10317364A - Width-increasing flash-setting injection method and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a width-increasing flash-setting injection method and its device to be employed even in ground where water veins exist and in the construction of emergency cutoff lining by enabling a high-strength, homogeneous injected setting material layer to be constructed in a short time by use of a two-liquid flash-setting material and to greatly increase operating efficiency by preventing the loss of time needed in conventional operations, such as the time to wait for setting. SOLUTION: An agitating blade 2 having an overhanging nozzle at its lower end and an overlapping jet nozzle having a core nozzle and an annular nozzle that overlap concentrically with its lower part are provided on the side wall of an end, and clean water, a liquid of setting material A, and a liquid of setting material B are force-fed under high pressure, respectively, from the overhanging nozzle 21, the core nozzle 22, and the annular nozzle 23, by way of three respective isolated flow passages. Therefore, as the liquids are ejected as high-speed jets, an injection pipe 1 is moved in a withdrawal direction while being rotated to form a set layer on the track of the injection pipe along the track of agitation, using a pressure film produced by the high-pressure jet of clean water from the overhanging nozzle 21 of the agitating blade.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of widening flash-injection and a method of injecting a two-component flash-hardening material into a target ground to improve soft ground, and to form an underground support layer and a waterproof layer. It concerns the device.

[0002]

Conventionally, when it is necessary to improve soft ground, to form an underground support layer or a water-blocking layer, and particularly to form a large-diameter columnar hardened layer, a one-component hardening material is required. By encapsulating with air and injecting with high pressure, the reaching distance of the jet has been extended to increase the diameter of the hardened layer.

[0003] However, with regard to the instantaneous two-component hardening material, when the two-component hardening material is wrapped with air and injected at high pressure, the one with the lower viscosity is discharged by air lift and the balance of the two solutions is lost. Therefore, it has been considered impossible to use such a method because it cannot achieve a predetermined effect.

[0004] Further, since the two-part curable material has problems of packing density and permeability, it cannot be used for an injection method which requires a large diameter and the strength of the curable material layer. The hardening material is limited to a slow-setting one-component hardening material.

[0005] As described above, the hardening material injection layer using the slow-setting one-component hardening material has a long hardening time. When the hardening material injection layer is injected as a support layer at an excavation site, the work proceeds in accordance with the excavation speed. It was extremely difficult to do so.

Further, if excavation is performed before sufficient hardening is performed, there is a problem that a supporting effect cannot be obtained and a serious accident may be caused.

[0007] Conventionally, the quick-setting effect material has not been used for supporting lining by injection, particularly for injecting the lid, because the quick-setting curing material is a two-part material and is cured in a short time by mixing the two parts. One of the reasons is that the injected hardening material is hardened before it sufficiently penetrates and penetrates to form a dense and hardened injection layer, thereby failing to obtain a uniform hardened layer.

[0008] In addition, in order to increase the filling density of the quick-setting hardening material, emphasis has been placed on permeation through a clearance without breaking the arrangement between soil particles by low-pressure injection.

[0009]

According to the present invention, an agitating blade provided with an overhanging nozzle at its lower end is provided at the tip side wall, and a polymerization jet nozzle at which a core nozzle and an annular nozzle are superimposed concentrically is provided below. , Three isolated channels are provided and one channel is communicated with the overhanging nozzle at the lower end of the stirring blade, and the two channels and the three channels are communicated with the core nozzle and the annular nozzle, respectively. When inserted into the ground and reaches a predetermined depth, fresh water is supplied to the flow path communicating with the overhang nozzle, the hardening material A liquid is supplied to the flow path connected to the core nozzle, and the hardening material B liquid is supplied to the flow path connected to the annular nozzle. By injecting each with a high pressure, while injecting as a high-speed jet, the injection pipe is rotated and moved in the withdrawal direction to form a hardened layer in the injection pipe locus along the stirring locus by the stirring blade, It addresses each issue.

That is, the liquid A and the liquid B of the instantaneous hardening material are mixed simultaneously with the injection by the polymerization injection nozzle,
At the top of the polymerization spray nozzle, a stirring blade with a protruding nozzle is provided at the lower end, and high-pressure fresh water jet is rotated while rotating, so that the upper part of the instantaneous hardening material jet is improved in advance with stirring and high-pressure fresh water jet. Further, the rising and discharging of the instantaneous hardening material jet sprayed by the coating of the high-pressure fresh water jet is suppressed to increase the reach of the instantaneous hardening material jet and increase the packing density.

[0011] Fresh water injected from the overhanging nozzle at the lower end of the stirring blade at high pressure cuts the surrounding soil in accordance with the rotation of the injection pipe, arranges the soil particles, and arranges the upper or lower side of the mixed jet of the A liquid and the B liquid. A pressure coating is formed to prevent the ejected instantaneous hardening material from rising and discharging, and a uniform hardening material is filled by the stirring and mixing effect enhanced by the removal movement of the injection pipe.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes an injection pipe, the first flow path 11 and the second flow path 1
2. The three flow paths 13 are provided, and the first flow path 11 communicates with a projecting nozzle 21 provided at the lower end of the stirring blade 2 projecting from the side wall of the injection pipe 1 and opened. The three channels 13
Are opened in communication with a nucleus nozzle 22 and an annular nozzle 23 provided concentrically under the stirring blade 2.

The injection pipe 1 has a swivel 3 at its rear end, and is connected to hoses 31, 32, and 33 that communicate with a material supply unit via pressure pump devices 6, 7, and is mounted on a base 4. It is supported by the installed injection tube operating mechanism 5.

The injection pipe operating mechanism 5 includes an operation drive mechanism 8 for rotating, moving forward and backward, or changing the inclination angle of the injection pipe 1, excavating and propelling the injection pipe 1 at a predetermined angle with respect to the target ground, and rotating and retracting the same. It has become.

The pumping device 6 connected to the hoses 31 and 32 for applying a pressure to the material to be injected is a pump for pressure-feeding a relatively viscous material which has been conventionally used for the two-component hardening material. The pressure pump device 7 connected to the device and the hose 33 for applying a pressure to the injection material is a high-pressure pump device for ensuring the output of the fresh water jet.

The injection pipe 1 constructed as described above is propelled and inserted toward the target ground G, and when it reaches a predetermined depth,
Solution A in the second channel 12, Solution B in the third channel 13, and one channel
The fresh water 11 pumped in each ^{200kg / cm 2 ~ 500kg / cm} 2 of about ultra high pressure, Shimizu from protruding nozzle 21, the liquids A and B for injecting a high velocity jet from the polymerization nozzle.

It should be noted that, depending on the construction situation, it is also possible to cope with each injection pressure by adjusting the pressure in accordance with the injection environment without using the above-mentioned ultrahigh pressure.

As described above, the two-part hardening material is injected into the target ground by retreating in the withdrawal direction while rotating the injection pipe while injecting the enclosing jet of the liquid A and the fresh water at a high pressure and rotating the injection pipe. A cured layer is formed in the shape, and this is arranged in parallel if necessary.

Since the present invention is constructed as described above, there is an effect that a uniform hardening material injection layer having high strength and being hardened in a short time by the instantaneous hardening material can be formed. Therefore, the present invention can be used for ground with water veins and emergency water stop lining, and also eliminates the wasteful time required for the conventional work such as the waiting time for curing, thereby greatly improving the work efficiency.

[0020]

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, and is an overall side view showing a construction state.

FIG. 2 is an enlarged vertical cross-sectional side view showing a main part structure of the injection pipe with a part cut away.

FIG. 3 is an enlarged front view of the same polymerization nozzle.

FIG. 4 is a bottom view of the same injection tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Injection pipe main body 11 Part 1 flow path 12 Part 2 flow path 13 Part 3 flow path 2 Stirrer blade 21 Overhang nozzle 22 Nuclear nozzle 23 Annular nozzle 24 Drilling blade 3 Swivel 31 A liquid pressure feeding hose 32 B liquid pressure feeding hose 33 Fresh water pressure feeding Hose 4 Base 5 Injection tube operating mechanism 6 Hardening material pumping device 7 Fresh water pumping device 8 Operation drive mechanism G Target ground H Ground hardening material injection layer

Claims (2)

[Claims] An agitating blade having an overhanging nozzle at the lower end thereof on a side wall of a tip portion, and a polymerization spraying nozzle in which a nucleus nozzle and an annular nozzle superimpose concentrically are provided at a lower portion thereof.
A flow path is provided, and one of the flow paths is communicated with the overhanging nozzle at the lower end of the stirring blade, and the two and three flow paths are communicated with the core nozzle and the annular nozzle, respectively, and the injection pipe is inserted into the target ground. ,
When a predetermined depth is reached, high-pressure pumping is performed on fresh water in the flow path communicating with the overhang nozzle, hardening material A liquid in the flow path communicating with the core nozzle, and hardening material B liquid in the flow path communicating with the annular nozzle. The widening flash-injection method, characterized in that the injection pipe is rotated while being ejected as a high-speed jet, moves in the withdrawal direction, and forms a hardened layer on the injection pipe trajectory along the stirring trajectory by the stirring blade. 2. A stirring blade provided with an overhanging nozzle at the lower end, a polymerization injection nozzle at the lower part of which a core nozzle and an annular nozzle polymerize concentrically are provided on the tip side wall, and three isolated flow paths are provided. The injection pipe communicated with the outlet nozzle and the nucleus nozzle and the annular nozzle are supported on a base provided with a rotating mechanism and a reciprocating mechanism, and the injection pipe is connected to the protruding nozzle among the three isolated flow paths. The pumping hose connected to the fresh water material tank via a pumping pump, and the pumping hose connected to the flow path communicating with the core nozzle and the annular nozzle is hardened material A via the pumping pump.
Widening flash injection device connected to the liquid and liquid B material tanks respectively