KR100964397B1 - Grouting method for pressing pipe - Google Patents

Abstract

PURPOSE: A grouting method of a propulsion pipe is provided to increase the structural stability and durability of the pipeline structure by filling the interval of the propulsion pipe and surrounding ground. CONSTITUTION: A grouting method of a propulsion pipe comprises: a step of successively burying a casing pipe the horizontal direction excavation; a step of forming a pipe assembly; and a step of inserting the mixture of a liquid plasticizer and cement milk through a grout injection hole(11) of the propulsion pipe.

Description

GROUTING METHOD FOR PRESSING PIPE

The present invention relates to the field of civil engineering, and more particularly, to a grouting method for embedding non-adhesive pipelines.

The underground construction of pipelines for the installation of water supply and sewage, electrical and telecommunication lines can be divided into two types of installation and non-adhesion. In the case of difficult installation such as downtown, the latter non-adhesive method is mainly used.

One of such non-adhesive pipeline laying methods is the pipe propulsion method (promotion pipe method).

In the pipe propulsion method, as shown in FIG. 1, the ground is vertically excavated to the planned depth, and the jack 100 is disposed at the front and the jack 200 is installed at the rear in the horizontal pipeline forming work section. Excavator 100 is excavated while moving forward by the extension movement of the 200, at this time by inserting the propulsion pipe (1) between the excavator 100 and the jack 200 and excavation and at the same time of the propulsion pipe (1) Sequential burial can be done together.

In further detail, first, the jack 200 is contracted and then the propulsion pipe 1 is inserted between the jack 200 and the excavator 100.

Then, when the jack 200 is elongated, the excavator 100 and the propulsion pipe 1 are moved forward by the stretching movement of the jack 200, and the excavation is performed at the same time. After the contraction, the other propulsion tube 1 is continuously inserted to extend the jack 200 again, and the pipe 200 is continuously formed repeatedly.

When the formation of the pipeline by the embedding of the plurality of propulsion tubes 1 is completed, the gap between the propulsion tube 1 and the ground is filled by grouting G (FIG. 2).

This pipe propulsion method is excellent in terms of safety and precision, it can shorten the air by a long propulsion section alone, there is an advantage in terms of safety by mechanical construction without the input of manpower.

After embedding the propulsion pipe 1, for the firm coupling and order of the pipe 1 and the ground, a tight grouting is required in the gap between the pipe 1 and the ground.

However, the pipe propulsion method is basically a non-adhesive method, so that the voids between the propulsion pipe 1 and the surrounding ground are formed very narrowly, so that the tight grouting, as described above, is difficult, and thus the voids over the cement milk having high fluidity are provided. Grouting has been performed by injecting into the.

Cement milk having a high flowability is easily filled with only a lower portion of the pores formed around the tube 1, and there is a problem in that bleeding is large, and a large amount of loss is not sufficient to fill (Fig. 3).

That is, the conventional pipe propulsion method has been a problem in that research on the grouting work is insufficient after embedding the pipe 1 by the propulsion work.

The present invention was derived to solve the above problems, and to provide a grouting method of the propulsion pipe to tightly fill between the propulsion pipe and the surrounding ground to increase the structural stability and durability of the pipeline structure. It is done.

The present invention, in order to achieve the object as described above, the propulsion step of sequentially embedding a plurality of propulsion pipes (1) by horizontal excavation and indentation to the ground to form a pipe assembly; And a grouting step of injecting a mixture of cement milk and a liquid plasticizer through the grout injection hole 11 of the propulsion pipe 1.

The grout injection hole 11 is preferably formed in the upper portion of the propulsion pipe (1).

The grout injection hole 11 is preferably provided with a stopper 12 to be detachable.

The grouting step is a cement milk supply pipe 21 formed to supply the cement milk; A liquid plasticizer supply pipe 22 formed to supply the liquid plasticizer; The cement milk supply pipe 21 and the liquid plasticizer supply pipe 22 is connected in common, and the mixture injection pipe (2) connected to the grout injection hole (11), it is preferably carried out by the tube assembly including a. .

The mixture comprises water and powder, the cement milk having a water / powder ratio of 50-300% by weight; It is preferable to include; 1-5% by weight of the liquid plasticizer.

The powder comprises cement, based on 100% by weight of the powder, 0.1 to 5.0% by weight of a porous resin for adsorption of heavy metals; 0.01 to 5.0% by weight of superabsorbent polymer resin; preferably includes.

The porous resin for adsorption of heavy metals may include a chelating resin, a styrene divinylbenzene crosslinked copolymer having a phosphate group introduced therein, a styrene divinylbenzene copolymer having a thiol introduced therein, a styrene divinylbenzene copolymer having a dithiocarbamate introduced therein, Styrene divinyl benzene copolymer with acetic acid already introduced, styrene divinyl benzene copolymer with imide oxime group, styrene divinyl benzene copolymer with sulfate group, methacrylic acid divinylbenzene copolymer, N- Preference is given to formation of one or two or more of the styrene divinylbenzene copolymers in which methylglutamic acid is introduced.

The superabsorbent polymer resin may be a mixture of one or two or more of a superabsorbent polymer resin of sodium acrylate polymer, sodium methacrylate polymer, acrylamide polymer, hydrolyzed acrylonitrile polymer, acrylic methacrylate copolymer, and acrylic acrylate copolymer main component. It is preferable that it is formed by.

Based on 100% by weight of the powder, it is preferable that 0.01 to 5.0% by weight of a thickener is included.

The thickener is preferably formed by mixing one or more of the thickeners of hydroxy ethyl cellulose, hydroxy methyl cellulose, hydroxy propyl cellulose, carboxy methyl cellulose, methyl cellulose main component.

Based on 100% by weight of the powder, it is preferred that 1.0 to 90% by weight of the mineral fine powder admixture.

The mineral fine powder admixture is preferably formed by mixing one or more of bituminous coal fly ash powder, anthracite fly ash powder, slag fine powder, natural pozzolane powder, limestone fine powder, silica fine mineral powder, other rock fine powder, and heat finely divided rock fine powder. Do.

On the basis of 100% by weight of the powder, it is preferable that 0.01 to 3.0% by weight of the dispersant powder is included.

The dispersant powder is preferably formed by mixing one or two or more of lignin sulfonate-based, naphthalene sulfonate-based, melamine sulfonate-based and polycarbonate-based powder admixtures.

The cement contained in the powder is preferably formed by mixing one or two or more of portland cement, slag cement, pozzolane cement or ultra-fine cement pulverized these cements.

The liquid plasticizer preferably includes a hydrophobically-modified Alkali Soluble Acrylic Copolymer Emulsion.

The present invention proposes a grouting method of the propulsion pipe to tightly fill between the propulsion pipe and the surrounding ground to increase the structural stability and durability of the pipeline structure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figure 4 below, the grouting method of the propulsion pipe according to the present invention basically, the propulsion to form a pipe assembly by embedding a plurality of propulsion pipes (1) sequentially by horizontal excavation and indentation to the ground step; And a grouting step of injecting a mixture of cement milk and a liquid plasticizer through the grout injection hole 11 of the propulsion pipe 1.

That is, after the pipe assembly is formed by the propulsion of the pipe, the grout is injected through the grout injection hole 11 previously formed in the propulsion pipe 1, so that the ground of each area in which each propulsion pipe 1 is installed is provided. There is an effect that grouting can be performed without omission.

In addition, as a grout, a mixture of cement milk and a liquid plasticizer is injected, and such a mixture is characterized in that fluidity is ensured during the filling operation, and after the filling, the flowability of the grout is instantaneously lost due to plasticity.

Therefore, it is possible to reliably construct by completely filling the air gap between the propulsion pipe 1 and the surrounding ground and preventing the loss of material after filling, and to prevent the contamination of soil, groundwater and rivers by the outflow of grout. Is added.

The grout injection hole 11 may be formed at any position of the propulsion pipe 1, but when the grout injection hole 11 is formed at an upper portion of the propulsion pipe 1, the injection hole 11 during the grouting operation through the injection hole 11 is performed. It is more preferable in that it can be confirmed that sufficient grouting has been performed as the grout is no longer injected or the grout is refluxed.

Although all grouting may be performed through the grout injection hole 11 formed in each propulsion pipe 1, when such work is recognized as waste according to the condition of the ground, the site situation, etc., some of the propulsion pipes 1a It may be efficient to grout only the surrounding area and leave the surrounding area of the remaining propulsion pipe 1b intact (FIG. 5).

In this case, in order to prevent the grout from flowing out through the grout injection hole 11 of the propulsion pipe 1b in the region where grout is not performed, it is preferable that a stopper 12 is provided to be detachably attached to the grout injection hole 11. Preferred (FIG. 6).

When injecting a mixture of cement milk and liquid plasticizer as grout, the mixture of these may be prepared in advance and injected through an injection tube. However, when the length of the pipeline is long, the flowability of the grout is controlled by the action of the plasticizer during transport of the mixture. As it is excessively lowered, it may be difficult to carry out grouting.

In order to prevent this, the cement milk supply pipe 21 formed to supply cement milk; A liquid plasticizer supply pipe 22 formed to supply a liquid plasticizer; It is to be connected to the cement milk supply pipe 21 and the liquid plasticizer supply pipe 22 in addition to the above grouting operation by a pipe assembly including a mixture injection pipe (2) connected to the grout injection hole (11) Preferred (FIG. 4).

With this configuration, when passing inside the long length of the pipeline, the cement milk and the plasticizer are supplied through the respective supply pipes 21 and 22, and only until the grout injection hole 11 is reached in the mixture injection pipe 2; This is because the above-described problems can be prevented at the source because it can be immediately injected by mixing with each other.

Hereinafter, the mixture used as grout in the process by this invention is demonstrated.

It basically contains water and powder, and the water powder ratio (Water / Powder Ratio) is 50-300% by weight of cement milk; It is preferably configured to include; 1-5% by weight of a liquid plasticizer.

Cement milk is based on 100% by weight of the total, 0.1 to 5.0% by weight porous resin for heavy metal adsorption; 0.01 to 5.0% by weight of superabsorbent polymer resin; It is preferable to include.

Here, as the porous resin for heavy metal adsorption, a chelating resin, a styrene divinylbenzene crosslinked copolymer having a phosphate group introduced therein, a styrene divinylbenzene copolymer having a thiol introduced therein, or a styrene divinylbenzene having a dithiocarbamate introduced therein Copolymer, Styrene divinyl benzene copolymer with imide acetic acid introduced, Styrene divinyl benzene copolymer with imide oxime group, Styrene divinyl benzene copolymer with sulfuric acid group, Methacrylic acid divinylbenzene copolymer It is preferable to use a material formed by mixing one or two or more of styrene divinylbenzene copolymers having N-methylglutamic acid introduced therein.

Figure 7 shows the matrix structure of the chelate resin is an example of the porous resin for adsorption of heavy metals.

The porous resin for adsorption of heavy metals serves to prevent environmental pollution by adsorbing heavy metals and alkalis eluted from cement.

As the superabsorbent polymer resin, one or two or more of a superabsorbent polymer resin of a sodium acrylate polymer, a sodium methacrylate polymer, an acrylamide polymer, a hydrolyzed acrylonitrile polymer, an acrylic acid methacrylate copolymer, and an acrylic acid acrylamide copolymer main component It is preferable to use a material formed by mixing.

The superabsorbent polymer resin absorbs the water of the cement milk having a high water cement ratio and stores it inside, thereby preventing separation of cement and water in the cement milk and minimizing bleeding.

The cement milk is characterized by ensuring the fluidity during the filling operation by the combined action of the above-described additives, while showing the plasticity that the flowability of the grout disappears instantaneously after filling.

Therefore, the above-mentioned cement milk grout exhibits plasticity characteristics in addition to fluidity. Therefore, during filling under pressure, the cement milk grout has sufficient fluidity necessary for injection work, but loses fluidity and shows plasticity in the state in which pressure after filling is not applied. There is an effect that the loss of the fillers do not occur through.

In addition, it is excellent in water inseparability, which prevents dilution, spillage and separation of materials by groundwater, river water and seawater, thereby minimizing the dissolution of heavy metals and alkalis. It is possible to fill, and there is no shrinkage after hardening, so that the volume change of the filling material does not occur after the injection, and thus, the order and ground reinforcement through complete filling are added.

The cement milk used in the process according to the present invention preferably contains 0.01 to 5.0% by weight of a thickener based on 100% by weight of the total.

Here, as the thickener, it is preferable to use a material formed by mixing one or more of the thickeners of hydroxy ethyl cellulose, hydroxy methyl cellulose, hydroxy propyl cellulose, carboxy methyl cellulose, methyl cellulose main component.

These thickeners increase the viscosity of the cement milk to improve the in-water inseparability of the fluid and increase the effect of preventing bleeding.

Cement milk used in the process according to the present invention, based on 100% by weight of the total, preferably contains 1.0 to 90% by weight of the fine mineral admixture.

Such fine mineral admixtures include materials formed by bituminous coal fly ash powder, anthracite fly ash powder, slag fine powder, natural pozzolane powder, limestone fine powder, silica mineral fine powder, other rock fine powders, or heat powdered rock fine powder or a mixture of two or more thereof. It is preferable to use.

Generally, the water is neutral, and the pH is about 6-7, but the water mixed with cement exhibits strong alkalinity with a pH of 12 or more due to the increase in alkalinity caused by calcium hydroxide eluted from the cement.

When Portland cement is mixed with the above-mentioned mineral fine powder admixture, the mixed admixture is an inert material, and thus does not hydrate with water, but reacts with alkali, eluted from cement, thereby increasing strength in the long term.

The mixed cement mixed with these admixtures has a low proportion of Portland cement in itself, and the admixtures in the mixed cement react with alkalis such as calcium hydroxide supplied from the Portland cement to generate inert secondary hydrates, so that they are eluted in contact with groundwater, river water, and seawater. It reduces the amount of alkali, which in the long term has the effect of densifying the cement structure and increasing chemical resistance and durability.

The cement milk used in the process according to the present invention preferably contains 0.01 to 3.0% by weight of the dispersant powder based on 100% by weight of the total.

The dispersant powder is preferably a material formed by mixing one or two or more of lignin sulfonate-based, naphthalene sulfonate-based, melamine sulfonate-based and polycarbonate-based powder admixtures.

Due to the plasticity of the cement milk may cause a problem that the fluidity is lowered, the above-described dispersant powder is effective to improve such a decrease in fluidity.

As the cement, it is preferable to use a material formed by one or two or more of portland cement, slag cement, pozzolane cement or ultrafine cement which is pulverized these cements.

Hereinafter, an experimental example for examining the performance of the cement milk used in the method according to the present invention will be described.

The mixing ratio of the cement milk composition for the experiment is shown in Table 1.

Cement milk was prepared by adding 100% by weight of water to the mixture by the above mixing ratio and stirring at a high speed.

As a comparative example, a common cement milk was prepared by mixing one ordinary portland cement and water in a 1: 1 weight ratio and stirring at high speed.

FIG. 8 is a photograph when cement milk according to a comparative example is left in water, and FIG. 9 is a photograph when cement milk according to an embodiment of the present invention is left in water. Underwater separation performance was recognized.

Table 2 shows the results of measuring the amount of bleeding of the cement milk according to the comparative example and this example.

Table 3 shows that the cement milk according to the comparative example and the present example was cured, mixed with 10 times of water, and elapsed for 10 hours, and then the weight of hexavalent chromium eluted from the cement by water was measured by ICP-AES. The results are shown.

Since the water environmental standard is 0.05ppm, the comparative example does not satisfy the above criteria, but it can be seen that the embodiment according to the present invention satisfies the above criteria.

Table 4 shows the results of measuring the change in pH after putting 1 liter of cement milk (solid state) according to the comparative example and this example into 200 liters of drinking water.

Compared with the comparative example, in the Examples of the present invention it can be seen that the alkali elution amount is very small.

As such, the cement milk used in the process according to the present invention is excellent in water inseparability, and can be stably injected in the ground in contact with groundwater, river water, and seawater, and can secure sufficient strength and prevent environmental pollution. Therefore, it can be confirmed that the construction is reliable, durable and eco-friendly.

On the other hand, the liquid plasticizer used in the process according to the present invention preferably includes a hydrophobically-modified Alkali Soluble Acrylic Copolymer Emulsion.

Liquid plastic materials have an aqueous solution state with little viscosity in the acidic region, but when neutralized by an alkaline component and the pH is raised to 6 or more, a long chain polymer structure is formed and the viscosity is rapidly increased.

Therefore, when the liquid plasticizer is transported or stored by itself, the viscosity is low, but when it is put into cement milk grout, the pH of the cement milk shows an alkalinity of 6 or more. Therefore, the cement milk is formed by connecting the powder particles to each other and coating the surface of the powder. It does not release even when it meets water, and prevents cement and filler admixtures from eluting in water.

These plastic grout fillings can maintain their shape at the time of injection in a natural state where external force does not exist due to the loss of fluidity due to the increase in viscosity, but the produced needle-shaped crystals are not yet strong in the binding force between the crystals. When the injection pressure is applied, it shows fluidity again and can fill the voids.

When the external force is removed after filling the voids (when filling is completed and filling pressure disappears), the fluidity disappears again, thus showing typical plastic body behavior.

Therefore, bleeding is suppressed and volume shrinkage does not occur, and the shape and structure are maintained even in the water, so that the grout is not diluted or spilled even when exposed to groundwater, and it is excellent in the inseparability in the water. The effect is possible.

Since the above has been described only with respect to some of the preferred embodiments that can be implemented by the present invention, the scope of the present invention, as is well known, should not be construed as limited to the above embodiments, the present invention described above It will be said that both the technical idea and the technical idea which together with the base are included in the scope of the present invention.

1 to 3 are for explaining the grouting method of the conventional propulsion pipe,

1 is a cross-sectional view of a pipe propulsion operation process.

2 is a sectional view of a grouting process.

3 is a cross-sectional view after the grouting operation.

Figure 4 below shows an embodiment of the present invention,

4 is a cross-sectional view of the grout injection hole and the injection tube.

5 is a cross-sectional view of a grouting process.

6 is a cross-sectional view of the grout injection hole and the stopper.

7 is a view showing a matrix structure of a chelate resin that is an example of a porous resin for heavy metal adsorption.

8 is a photograph when the cement milk according to the comparative example is left standing in water.

9 is a photograph when the cement milk according to an embodiment of the present invention is left in water.

** Description of the symbols for the main parts of the drawings **

1,1a, 1b: propulsion pipe 11: grout injection hole

12: stopper 2: mixture injection tube

21: cement milk supply pipe 22: liquid plasticizer supply pipe

G: Grout

Claims (16)

delete delete A propulsion step of sequentially embedding the plurality of propulsion tubes 1 by horizontal excavation and indentation into the ground to form a tube assembly; And a grouting step of injecting a mixture of cement milk and a liquid plasticizer through the grout injection hole 11 of the propulsion pipe 1. The grout injection hole 11 is formed in the upper portion of the propulsion pipe (1), Grouting method of the propulsion pipe, characterized in that the stopper 12 is installed in the grout injection hole (11) to be detachable. A propulsion step of sequentially embedding the plurality of propulsion tubes 1 by horizontal excavation and indentation into the ground to form a tube assembly; And a grouting step of injecting a mixture of cement milk and a liquid plasticizer through the grout injection hole 11 of the propulsion pipe 1. The grouting step A cement milk supply pipe 21 formed to supply the cement milk; A liquid plasticizer supply pipe 22 formed to supply the liquid plasticizer; A mixture injection pipe 2 connected to the cement milk supply pipe 21 and the liquid plasticizer supply pipe 22 in common, and connected to the grout injection hole 11; Grouting method of the propulsion pipe, characterized in that carried out by a pipe assembly comprising. delete A propulsion step of sequentially embedding the plurality of propulsion tubes 1 by horizontal excavation and indentation into the ground to form a tube assembly; And a grouting step of injecting a mixture of cement milk and a liquid plasticizer through the grout injection hole 11 of the propulsion pipe 1. The mixture is The cement milk containing water and powder, wherein the water / powder ratio is 50-300 wt%; It includes; 1-5% by weight of the liquid plasticizer; The powder comprises cement, Based on 100% by weight of the powder, 0.1-5.0 wt% of porous resin for adsorption of heavy metals; 0.01 to 5.0% by weight of superabsorbent polymer resin; Grouting method of the propulsion pipe comprising a. The method of claim 6, The porous resin for heavy metal adsorption Chelate resin, styrene divinylbenzene crosslinked copolymer with phosphate group, styrene divinylbenzene copolymer with thiol, styrene divinylbenzene copolymer with dithiocarbamate, styrene with imide acetic acid Styrene divinyl benzene copolymer, styrene divinyl benzene copolymer with imide oxime group, styrene divinyl benzene copolymer with sulfuric acid group, methacrylate divinylbenzene copolymer, styrene with N-methylglutamic acid A grouting process for a propulsion tube, characterized in that formed by mixing one or two or more of the divinylbenzene copolymers. The method of claim 6, The super absorbent polymer resin Formed by mixing one or two or more of superabsorbent polymer resins of a sodium acrylate polymer, a sodium methacrylate polymer, an acrylamide polymer, a hydrolyzed acrylonitrile polymer, an acrylic acid methacrylate copolymer, and an acrylic acid acrylamide copolymer main component. The grouting method of the propulsion pipe. The method of claim 6, Based on 100% by weight of the powder, Grouting method of the propulsion tube, characterized in that the thickener 0.01 to 5.0% by weight. 10. The method of claim 9, The thickener A grouting process of a propulsion tube, characterized in that it is formed by one or two or more of a thickener of hydroxy ethyl cellulose, hydroxy methyl cellulose, hydroxy propyl cellulose, carboxy methyl cellulose, methyl cellulose main component. The method of claim 6, Based on 100% by weight of the powder, Grouting method of the propulsion tube, characterized in that it contains 1.0 to 90% by weight of the fine mineral admixture. The method of claim 11, The mineral fine powder admixture Bituminous coal fly ash powder, anthracite fly ash powder, slag fine powder, natural pozzolanic powder, limestone fine powder, silica fine mineral powder, other rock fine powder, or a mixture of two or more of the heat treated rock fine powders. Grouting method. The method of claim 6, Based on 100% by weight of the powder, Grouting method of the propulsion tube, characterized in that 0.01 to 3.0% by weight of the dispersant powder. The method of claim 13, The dispersant powder is A grouting process for a propulsion tube, characterized in that formed by mixing one or two or more of a lignin sulfonate, naphthalene sulfonate, melamine sulfonate and polycarbonate powder admixture. The method of claim 6, Cement contained in the powder A grouting process for a propulsion tube, characterized in that it is formed by one or two or more of portland cement, slag cement, pozzolane cement or ultrafine cement pulverized these cements. The method of claim 6, The liquid plasticizer A grouting process for a propulsion tube comprising a hydrophobically-modified Alkali Soluble Acrylic Copolymer Emulsion.

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