JPS5926726B2 - Injection method and equipment for soil hardening liquid, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chemical injection method and apparatus used for improving foundation ground in civil engineering work.

It is well known that the soil is improved by injecting a chemical into the ground, such as in the retinche method, but when it is used as a main agent and a reaction accelerator in the ground, it polymerizes or reacts in the ground. If so, the reacted substances become a pollution.

However, when using substances that cause pollution, such as sulfur e and an alkaline substance that neutralizes it, such as caustic soda, if it is possible to completely mix the attacking amounts of these substances, it becomes a neutral substance. It will not cause pollution.

However, when injecting chemical liquids in the conventionally commonly used soletanche method, etc., two chemical liquids (liquids A and B) are pumped from above through a swivel to an injection rod with a bit attached to the tip of the injection rod. Therefore, complete mixing cannot be expected.

This is why they have traditionally been the cause of pollution.

Therefore, in order to solve these problems and completely eliminate pollution, it is necessary to use a product in which the above-mentioned specified amounts of chemical solutions are completely mixed.

In view of these points, in order to solve these problems, the present invention incorporates a stirring device into the injection pipe through which the chemical liquid is fed under pressure to achieve complete mixing.

That is, the enclosure space element is made of a single hollow body having a pair of parallel opposing side walls that have a wall effect in the direction of fluid ejection, and an outflow hole that does not affect the vortex flow due to the wall effect. It has a built-in stirrer and the pressure-fed chemical liquid is ejected inside the element, creating a vortex on one side of the casing space element.
At the same time, this turbulent flow is created, which passes through the control space and generates a vortex in the opposite space.The vortex is generated alternately, completely mixing and stirring, and is sent out from the outflow hole to the ground. It is designed to be injected inside the body.

Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes an injection pipe with a metal crown 2 such as a bit attached to the lower part, and a differential pressure valve 3 is built in the metal crown 2, so that an injection nozzle 4 can be opened and closed depending on the level of liquid feeding pressure.

Further, the tip of the injection tube 1 has a housing space element 7 built therein, which is a large-sided housing, and this space element 7 has two chemical fluid passages inserted along the axial direction. Heavy pipe 5,
6 are connected to provide an inlet 12, and an outlet 8 determined by the working pressure and flow rate of the double pipes 5 and 6 is provided on the side of the housing space element T opposite to the inlet 12 for injection. An injection nozzle 4 opened and closed by an injection hole 9 bored in the side wall of the pipe 1 and a differential pressure valve 3
Please contact me via passage 10.

The housing 1 of the housing space element has a pair of parallel opposing side walls that have a wall effect in the jetting direction of the fluid jetted from the double pipes 5 and 6, and a flow that does not affect the vortex flow due to the wall effect. It consists of a large-sided box with an outlet 8.

Further, this enclosure space element 7 has a lead wire 11 taken out from the top and set in a recorder (not shown) so that oscillation phenomena can be electrically recorded.

This large-sided casing may be made into a cylindrical shape, and if both corners of the nozzle are appropriately rounded to eliminate stagnation of the flow as shown in Figure 3, the mixing and stirring effect will be further improved. Effective.

The chemical liquid to be pumped into the injection tube is a mixture of A liquid such as cement paste and B liquid, which is an accelerator that hardens instantly, or A liquid, B liquid, and air, and injection injection of a mixture of A liquid and B liquid and air. Of course, it is necessary to have a plurality of passages inside as a double or triple pipe.

The present invention has the above-mentioned configuration, and when the chemical liquid in the chemical liquid tank or the air pressure pump or the like is used to forcefully feed the chemical liquid through the pipes into the respective flow paths in the injection tube 1 through the swivel, the chemical liquid passing through the pipe is transferred to the casing space element T.
The liquid is injected into the interior of the device T, mixed by stirring by alternately generating vortices within the element T, guided from the outlet 8 to the passage 10, and injected toward the ground through the injection hole 9 or 4.

The injection angle of the injection hole 9 may be appropriately selected depending on soil conditions.

As mentioned above, a stirring device (enclosure space element) is incorporated into the injection tube 1, and a vortex is generated continuously within the device to efficiently mix and stir the chemical solution, so that the specified amount can be completely mixed and injected. Therefore, it becomes a neutral substance and can eliminate pollution.

In addition, when air is sent to one of the channels to mix and stir the chemical solution and air to form a jet stream, the crushing force of the jet stream increases dramatically and the injection range is expanded.

In addition, the gel time is controlled by complete mixing of the curing agent of liquids A and B, and the gel time is limited to a certain limited pattern, and the injection rate based on conventional calculations is satisfied without being diluted with water in the ground. By incorporating such a stirring device, there will be no failure due to wall effect oscillation, there will be no upper or lower pressure limits, and it can be easily attached to the injection pipe.

The present invention involves inserting an injection pipe into the ground using the device configured as described above, and when it reaches a predetermined position, liquid A, liquid B, or depending on the purpose, liquid A, liquid B, and air are introduced into each channel of the injection pipe. When pumped, the A liquid and the B liquid are completely stirred and mixed in the stirring device, and the reaction is completed, and the mixture is injected into the ground from the tip nozzle.

In the case of a liquid-based harmless liquid, the effective force of the jet stream can be strengthened by flowing only the liquid curing liquid and air.

If this injection is continued and the injection pipe is raised by side injection, the jet will cut the ground and mix the hardening liquid etc. into the same area, so a plate-shaped underground hardened layer will be created by its trajectory. .

When this is done by downward injection, natural injection can be performed without causing any change in the ground structure.

Also, if you use side injection to rotate the injection tube, then stop injection and pull up the injection tube, it is effective for improving the bottom plate, and if you use side injection to rotate and raise the injection tube, you can create a cylindrical hardened layer. can be created.

The hardened layer created in this way is sufficiently stirred and mixed inside the injection pipe, unlike conventional methods in which both liquids A and B react and gel after being injected into the ground. There is no outflow of toxic substances due to reaction leakage, gel time is shortened, and an extremely strong solidified layer is formed.

Furthermore, when air is mixed in, the reach of the jet flow is extended, so a hardened layer with an extremely large diameter is created, and the effect is extremely significant.

[Brief explanation of the drawing]

The figures show embodiments of the present invention, in which Figure 1 is a longitudinal sectional view of the main parts of the injection device, Figures 2 and 4 are perspective views of the embodiment of the stirring device, and Figure 3 is the embodiment of the stirring device. The vertical cross-sectional views and FIGS. 5 to 8 are situation diagrams of the injection construction example. 1...Injection pipe, 2...Metal crown, 3...Differential pressure valve, 4...Injection nozzle,
5, 6... Channel forming tube, 1... Enclosure space element (stirring device), 8... Outlet, 9...
...Injection nozzle, 10...Flow path, 11...
...Lead wire, 12...Inflow port, E...Self-hardening layer.

Claims (1)

[Scope of Claims] 1. A housing space element having an inlet consisting of a plurality of drug solution flow channels and an outlet consisting of a single flow channel is built inside the injection tube tip portion, and the housing space element An injection pipe configured so that the mixed and agitated chemical liquid is injected from an injection nozzle provided on the lower side wall of the injection pipe is inserted into the ground, and different types of chemical liquids, air, etc. are introduced into the plurality of chemical liquid flow channels. A method for injecting a ground hardening liquid, etc., characterized in that the liquid is pumped and injected into the ground from an injection nozzle of the injection pipe while being stirred and mixed by a vortex phenomenon generated within an enclosure space element. '2-Incorporate an enclosure space element having an inlet at the end of the plurality of channels and an outlet consisting of a single channel inside the distal end portion of the injection tube provided with a plurality of channels, and create an enclosure space. 1. A device for injecting soil hardening liquid, etc., characterized in that an outlet of the element is connected to an injection nozzle provided on a side wall of an injection pipe.