JPS6347411A - Injection of chemical grout - Google Patents

Abstract

PURPOSE:To cause chemical grout to permeate widely into the ground by a simple apparatus by which solid carbonic acid is vaporized in an air-tight container and chemical grout is injected under pressure into an injection port by utilizing the pressure of the vaporized carbonic acid. CONSTITUTION:An injection port 1 is formed in a place where chemical grout is to be injected, and an injection pipe 2 is inserted into the port 1 and a caulking 3 is packed. Chemical grout 5 is put in a container 4 through a charging port 6 and solid carbonic acid 8 is charged through a charging port 9 into the container 4. Each port other than the outlet 7 of chemical grout is closed. The solid carbonic acid is vaporized to raise the internal pressure of the container 4 and the chemical grout 5 is pushed out from the outlet 7 and injected through the pipe 2 into an injection place. Chemical grout can thus be injected by such a simple apparatus and the permeation range of the chemical grout can be widened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for injecting a drug used as an injection method in the civil engineering and construction fields.

[Prior art]

Traditionally, in the civil engineering field, various soil stabilizers and improvers have been used for the purpose of stabilizing the ground and stopping water, and in the architectural field, they have been used mainly for the purpose of repairing structures and dyed materials made of hydraulic substances. Various chemicals are used by injection method.

Methods for injecting these drugs into the target area include 1) natural penetration method, and 2) method using the contractile force of an elastic body.

There are 3) depressurization method, 4) pressurization method with compressed gas, and 5) method of pressurizing with a pump, but the press-fitting method using a pump is the mainstream.

[Problems to be solved by the present invention]

Methods 1) and 2) have low working efficiency when injecting a highly viscous drug, and are not suitable for injecting deeply.

Method 3) requires a suction device and is not suitable for deep injection.

-a, the penetration state of the drug depends on the conditions on the side of the injection target, for example, the compactness of the construction body made of a hydraulic substance.

It is affected by various conditions such as the width and length of cracks, the diameter of soil particles in the ground, the filling density, and the amount of spring water or underground water in tunnels, dams, underground structures, etc. In reality, these conditions vary widely and the permeability of the drug varies greatly depending on the injection location, making it difficult to select injection equipment with appropriate specifications.

Furthermore, when injecting an epoxy resin or the like as a chemical into cracks in a concrete structure, for example, the chemical has a high viscosity, so it does not penetrate easily under low pressure and usually takes a long time.

In an attempt to inject this in a short period of time, the injection pressure is increased (this may cause problems such as enlarging cracks in the structure or injecting the drug into areas other than the intended areas).

The basic principle of drug injection is to inject as widely as possible at low pressure.
It is said that it is best to apply it in a short time and without losing the chemical.

Therefore, it is desirable to use a drug injection device with performance suitable for the conditions of the injection site.

In general, conditions such as the required pressure and injection speed for drug injection differ depending on the position of the injection hole, so it is difficult to pressurize drugs into multiple injection points using one pressurization source using method 4) or 5). be.

When simultaneously performing work on areas with poor chemical permeability and requiring a long time to inject a small amount of the chemical, and areas with good chemical permeability that allows a large amount of the chemical to be injected in a short period of time, it is important to In the method using a pressure source, a large amount of the chemical is injected into areas where it is easy to penetrate, and no chemical may be detected at areas where it is difficult to penetrate, making the construction work uncertain.

In order to accommodate all injection points with different conditions, there is a problem in that a large number of pressurizing sources with different performances must be prepared, or one with a large excess of performance must be used.

It costs a lot of money to conduct a polling survey to understand the injection conditions before injecting the drug, and even if the survey is conducted, the injection conditions often differ depending on the injection position, and in the end, the injection equipment has limited capacity. The reality is that we have to prepare everything from small to large.

In addition, when using the press-in method using a pump, if the injection pump is stopped after a certain amount of drug has been injected, the driving pressure will be lost, so the penetration range of the drug cannot be expected to expand significantly beyond that point, and the penetration range will be deeper and wider. The problem is that in order to push the drug further, it is necessary to supply new drugs, which increases the amount of drugs consumed.

[Means for solving problems]

The present inventors have conducted various studies to improve these conventional problems, and as a result, when injecting a drug into the target area,
The vaporization pressure of solid carbon dioxide in a sealed container can be used, and by using this pressure once a predetermined amount of drug is injected, the permeation range of the drug can be further expanded without replenishing the drug. In addition, for chemicals that react with carbon dioxide gas, such as silicate-based or cement-based soil stabilizers, it not only expands the permeation range of the chemicals, but also reduces the curing time of the chemicals. The present invention was completed based on the discovery that the effects of shortening the gel strength and increasing gel strength can also be obtained.

That is, the present invention is characterized by ``vaporizing solid carbonic acid in an airtight container, and using the resulting pressure to pressurize a drug in an airtight container having a drug outlet to push the drug out of the container. The gist is ``methods of drug injection''.

When solid carbonic acid is filled into a sealed pressure-resistant container, the pressure inside the container gradually increases as the solid carbonic acid vaporizes due to the surrounding heat.The present invention aims to increase the pressure within the container in order to expand the drug injection and the permeation range of the drug. It uses

In the method of the present invention, after injecting a predetermined amount of the drug, the gas is injected by switching to carbon dioxide gas obtained by vaporizing solid carbon dioxide, thereby diluting the drug without replenishing the drug. This allows the injected drug to be pushed deeper into the body, further expanding the penetration range of the drug.

In the method of the present invention, the drug injection pressure can be arbitrarily adjusted by ensuring the pressure resistance of the container and adjusting the amount of solid carbon dioxide charged in accordance with the permeability of the drug to the injection site.

If the permeability of the drug is high, a small amount of solid carbonic acid may be used; if the permeability is low, the injection pressure may be increased by increasing the amount of solid carbonic acid.

In addition, a plurality of containers can be combined and used by switching alternately, thereby making it possible to continuously inject a large amount of medicine.

For example, in the civil engineering field, the method of the present invention can be applied to various soil stabilizers such as cement-based, silicate-based, hentonite-based, and polymer-based soil stabilizers, improvers, and water-stopping agents for the purpose of ground stabilization and water supply. In addition, in the construction field, repair of structures mainly made of hydraulic materials, such as buildings, roads, bridges, tunnels, dams, water and sewage pipes, underground cable pipes, utility ditches, subway facilities, etc., and underground structures and concrete secondary Various agents for filling cracks in products, reinforcing them, stopping water, etc., such as polymers for mixing with cement, monomers or polymers for impregnating concrete, liquid resins for resin concrete,
Water-based polymer dispersions such as rubber latex, resin emulsions, and mixed dispersions used in organic and inorganic adhesives, waterproofing agents, and sealants, water-soluble polymers or monomers such as polyvinyl alcohol, polyacrylates, cellulose derivatives, and epoxies. It can be used to inject liquid polymers such as resins, unsaturated polyester resins, and urethane resins.

Also, industrial waste treatment and sludge solidification treatment.

It can also be used to inject chemicals used in pollution prevention measures such as solidification treatment to prevent the elution of hazardous substances, especially heavy metals.

For injection, these drugs can be used alone or in combination of two or more.

River sand, mountain sand, sea sand, silica sand, various lightweight aggregates, calcium carbonate, fly ash, finely divided silica, pozzolan, etc. may be added to these chemicals.

The method of the present invention can be applied to materials that can be press-fitted, such as an aqueous solution, a slurry, or a relatively soft paste.

The agent may be selected as appropriate depending on the purpose of use. For example, for reinforcing or water-stopping cracks in concrete structures, deteriorated or weakened areas, or areas where water is flowing out from cracks in underground structures. If the purpose is to
Liquid polymers such as epoxy resins, unsaturated polyester resins, and urethane resins, water-based polymer dispersions, and various adhesives are used, and when the purpose is to stabilize the ground, soil, and rock, cement-based or silicate-based soil stabilizers.

In the method of the present invention, the drug and solid carbonic acid may be placed in the same container, or they may be placed in separate containers, and the pressure inlet of each container may be connected with an appropriate joint to allow the drug and solid carbonate to be supplied from the solid carbonic acid side. It is also possible to adopt a method of pressurizing the sides.

The method of the invention will be explained with the help of figures.

FIG. 1 is a schematic diagram showing an example in which a drug and solid carbonic acid are placed in the same container in one embodiment of the method of the present invention. Moreover, FIG. 2 is a schematic diagram showing an example in which a drug and solid carbonic acid are each placed in separate containers in another embodiment of the method of the present invention.

Drill an injection hole (1) where necessary to inject the drug.
) and insert the injection tube (2).

If necessary, fill the area around the injection pipe (2) with a filler or caulking material (3), further fix the surface of the injection point,
This prevents the drug from flowing out from the surface through the gap around the injection tube (2).

Inject the drug (5) into the container (4) from the loading port (6),
Charge solid carbonic acid (8) from the charging port (9), and pour it into the chemical outlet (
Seal each day except 7).

In the case of the system shown in FIG.
Each pressure introduction port OI of 1b is connected by a joint αυ-a so that pressure can be applied from the solid carbonic acid side to the drug side.

Solid carbonic acid evaporates into container (4) (+4 in Figure 2).
1-a, +41-b) increases, the drug (5
) is forced out of the outlet (7) and forced into the injection point via the joint aυ-b and the injection tube (2).

At least one of a pressure regulator, a safety valve, a blow valve, etc. is attached to the nozzle (2) to regulate the pressure inside each container (not shown).

The container used in the present invention is made of an airtight material, and the container for vaporizing solid carbonic acid (hereinafter referred to as a pressurized container) has a charging port and a pressure introducing port for solid carbonic acid, and a container for storing a drug. (hereinafter referred to as drug container) is the drug loading port,
It has a pressure inlet and a drug outlet, and can be closed each day with a lid, valve, etc. as necessary.

In the method of the present invention, one container is provided with a solid carbonic acid inlet, a drug inlet, and a drug outlet (one port can also be used in common) to function as both a pressurized container and a drug container. An integrated container can also be used.

The container used in the present invention preferably has a structure to which at least one of a pressure regulating device, a safety valve, a blow valve, etc. can be attached.

Like silicate-based or cement-based soil stabilizers,
If the reaction between the drug and carbon dioxide produces favorable results such as shortening the curing time and increasing the strength of the solid body, direct pressure may be applied so that the carbon dioxide is absorbed by the drug and can be used effectively.

If you want to avoid contact between the drug and carbon dioxide, or if carbon dioxide is not present at the injection site, use an airtight and flexible membrane made of rubber or synthetic resin. By using a sealed container and separating the drug and carbon dioxide gas with a membrane inside, it is possible to prevent contact between the drug and carbon dioxide gas, and also to prevent carbon dioxide gas from entering the injection site. The size of the membrane should be large enough to accommodate the increase in the gas phase inside the container.

It is also possible to use a sliding type where the partition structure is moved using gas pressure, or a piston type.

The pressure resistance of the container used in the present invention is such that it can accommodate the required drug injection pressure.

In terms of -m, it is preferable that the injection pressure be as low as possible; however, if it is too low, injection may not be possible or will take a long time, reducing efficiency.

For example, in the case of various chemicals for the purpose of repairing concrete structures, the amount usually ranges from 0.1 to 20 kg/Cl1l.
-G, and in the case of various soil stabilizers for the purpose of stabilizing the ground and stopping water, it is usually 1 to 5Q kg/c.
Injection is performed at approximately d-G, and any material that can accommodate this may be used.

In the case of the present invention, it is determined at most by the physicochemical properties of carbon dioxide.

The size of the container used in the present invention can be selected depending on the purpose and is not particularly limited.

For example, when injecting into cracks in a concrete structure, the pore volume per location is small and the amount of drug injected is small, so the container size should be between 0.01 and 101.
, preferably a container with a volume of 0.05 to 51. In addition, when several hundred to several tens of thousands of chemicals are injected per injection hole, such as soil stabilization, the size of the container is is preferably about 10 to 1001.

The material of the container used in the present invention may be selected from those that can withstand the required pressure; for example, rubber or synthetic resin may be used for low pressure applications, and metal may be used for high pressure applications. Note that it is preferable to use a material that has corrosion resistance that is difficult to be affected by corrosion caused by chemicals.

The auxiliary equipment for the container used in the present invention includes a device for supplying the drug solution or solid carbonic acid to the container, a device for adjusting the temperature of the drug,
A temperature-adjustable heating device for regulating the vaporization rate of solid carbonic acid, a pressure regulating device for regulating the pressure inside the container,
Examples include safety valves, blow valves, thermometers, flow meters, etc. to protect containers.

As the solid carbonic acid used in the present invention, commercially available solid carbonic acid can be used, and the solid carbonic acid can be in any shape as long as it can fit into a container.

While various liquefied gases must be stored and handled in pressure-resistant containers, solid carbon dioxide can be handled conveniently at normal pressure, so the method of the present invention is easy to implement at construction sites. It has the great advantage of being

The rate of vaporization of solid carbonic acid is affected by the ambient temperature and the degree of heat supplementation relative to the amount charged, and the pressure within the container increases slowly.

In the case of soil stabilizer injection, at the beginning of the injection, the area around the injection pipe is disturbed by polling water, so the agent can easily penetrate even at low pressure, but as the infiltrated agent hardens, the resistance increases. At the same time, the viscosity of the drug to be injected increases over time, so it is necessary to increase the injection pressure. In the case of the present invention, the pressure inside the container is low at the start of injection, and as time passes, the pressure inside the container increases as the amount of vaporized solid carbonic acid increases, which is extremely preferable.

If you want to obtain high pressure from the beginning of injection, you can use a small-capacity container, or increase the amount of chemical charged to reduce the volume of the gas phase, or increase the amount of solid carbonate charged. Furthermore, if necessary, the pressure can be increased within a short time by heating the solid carbonic acid.

The amount of solid carbonic acid used is adjusted depending on the amount of drug to be injected and the injection pressure.

For example, when the volume of the gas phase inside the container is 11, the temperature is 15°C.
The amount of solid carbonic acid required to raise the pressure inside the container to 2 kf/dG is approximately 0.086 mol.

After injecting a predetermined amount of the drug into the injection point, in order to further expand the permeation range of the drug within the injection point, the injection is performed using the residual pressure in the container or the gas pressure obtained by replenishing solid carbonic acid if necessary. It is best to apply pressure to the area to further push the injected medicine inside.

〔Effect of the invention〕

The effects of the present invention are as follows.

(1) The method of the present invention is particularly suitable for injecting a drug simultaneously into a plurality of injection locations having different drug permeability.

By attaching the injection device used in the method of the present invention to each injection site, fine-grained construction can be performed depending on the permeability of the drug.

(2) By replenishing and adjusting the amount of solid carbon dioxide in the container as appropriate, there is no need for complicated operations, and the solid carbon dioxide itself can be handled at normal pressure, saving labor by transporting it in a tube, making it easy to use at the construction site. is easy to implement.

(3) Since no power source is required, the effect of energy saving is significant, especially in cases where injection requires a long time.

(4) By pressurizing the injected drug with carbon dioxide gas, the injected drug can be pushed deeper without the need to replenish new drugs, and the permeation range of the drug can be further expanded.

(5) For agents that react with carbon dioxide gas, such as silicate-based or cement-based soil stabilizers, it is important to not only expand the permeation range of the agent, but also shorten the hardening time and improve gel strength. You can get an increasing effect.

〔Example〕

Next, the present invention will be explained by examples.

Example-1 A hole was drilled into a crack in a reinforced concrete structure, and an injection pipe with a diameter of 10 fi was driven into the crack.

The area around the injection pipe and the surface of the concrete were hardened with epoxy resin adhesive.

Next, a water pressure of 10 kg/cj-G was applied to each injection site for 3 hours, and the amount of water permeation was measured.

The results are shown in Table-1.

After drying the specimen, a drug was injected using an injection device as shown in FIG. 1 in the following procedure.

900 cc of each of the various drugs shown in Table 1 was charged into a metal pressure-resistant container with a volume of IIt, and the drug outlet of each container was connected to each injection pipe using a joint.

Next, 20 g of each solid carbonic acid was placed in a polyethylene bag having a capacity of 11 to prevent direct contact between the drug and the solid carbonic acid, and the bags were inserted and fixed in the pressure-resistant container.

As the solid carbonic acid vaporized, the polyethylene bag expanded, compressing the gas phase in contact with the drug, and as the pressure inside the container rose, the drug was injected into the specimen. The internal pressure of the container was adjusted using a pressure regulator so that the injection pressure did not exceed 15 kg/aj-G.

The injection time was 1 hour for each injection site.

The amount of drug injected into each injection site was as shown in Table 1.

After the injection treatment was completed, the water permeation amount was measured under the same conditions as before the treatment after being left for one week.

As a result, as shown in Table 1, the amount of water passed could be significantly reduced.

Table-1 Example-2 A 101 iron mold was filled with river sand and consolidated.

On the other hand, a mixture of 200 parts of JIS No. 3 water glass and 240 parts of water? 20 parts of ethylene carbonate as a curing agent was added to liquid No. 8 to prepare an injection drug with a curing time of 3 minutes.

As shown in Fig. 2, an injection device assembled by connecting the pressure ports of two polyethylene containers (capacity 2 11) is used, and the above drug 11 is added to the first container (drug container). Solid charcoal t1.0.35+ol was charged into the second container (pressurized container), and the pressure inside the container was 0.5 kg/c.
While setting the #PI clause with the blow valve so as not to exceed si-G,
400cc of drug was injected.

The compressive strength of the compacted soil after being left for one day was 11 kg/cd.

After injecting 400 cc of the drug in the same manner, the drug container was removed, and the pressurized container was replenished with 0.086 mol of solid carbonic acid, vaporized, and vented into the mold through the injection tube.

The compressive strength of the compacted soil increases to 15 kg/aJ after several days of W.
Met.

[Brief explanation of the drawing]

FIG. 1 is an example in which a drug and solid carbonic acid are placed in the same container in one embodiment of the method of the present invention, and is a schematic diagram showing an injection device used in Example-1. FIG. 2 shows an example in which the drug and solid carbonic acid are each placed in separate containers in another embodiment of the method of the present invention, Example-2
FIG. 2 is a schematic diagram showing the injection device used in FIG. Explanation of symbols; (1)...Injection hole, (2)...Injection pipe. (3) Filler or caulking material. +41, (41-a, +41-b-...container. (5)...drug, (6)...drug inlet, (7)...
...Drug outlet. (8)...Solid carbonic acid, (9)...Solid carbonic acid inlet. (9) -A...Solid carbon dioxide receiver, +91B...Inner membrane for partition. OI...Induction port, 0υ-a, b...Joint. Foundation: Nozzles for mounting pressure regulators, safety valves, blow valves, etc. 03...Mold, (+4+...River sand.

Claims (1)

[Claims] A method for injecting a drug, which comprises vaporizing solid carbonic acid in an airtight container, and using the resulting pressure to pressurize the drug in an airtight container having a drug outlet to push the drug out of the container.