KR102628108B1 - Eco-friendly micropile and manufacturing method thereof - Google Patents

Abstract

The present invention relates to an eco-friendly micropile and a manufacturing method thereof. The micropile, which is a rod with a predetermined length and a predetermined diameter and has a thread formed on the outer surface thereof, comprises a coating layer formed on the outer surface thereof to improve the stability and corrosion resistance of the micropile, and bonding strength with concrete during construction, wherein the coating layer is formed with a coating agent containing C_3H_5KNaO_5S compound, and the coating agent consists of a mixture in which 73-77 wt% of water and 23-27 wt% of the C_3H_5KNaO_5S compound are mixed. According to the present invention, the surfactant action of reducing the surface tension of cutting oil used during the threading process makes the micropile non-slippery to provide excellent stability and secure protective functionality against corrosion, thereby enhancing the bonding strength between the micropile and cement-based concrete.

Description

Eco-friendly micropile and manufacturing method thereof {Eco-friendly micropile and manufacturing method thereof}

The present invention relates to micropiles and their manufacturing method, which are used for ground reinforcement and earthquake-resistant design during the construction of building structures or civil engineering structures, and more specifically, to reduce the interfacial tension of the cutting oil used in rolling for thread processing. It relates to an eco-friendly micropile and its manufacturing method that have excellent fixation by making it non-slippery through surface activity, secure the pile protection function by rust prevention, and increase the bonding strength between concrete and the pile.

In general, various architectural structures and civil engineering structures inevitably have a structure in which the load of the structure is transmitted to the ground, so foundation work is very important.

The foundation work required for the construction of such structures takes place in a variety of forms and is broadly classified into direct foundations and pile foundations.

The pile foundation is used for the purpose of preventing subsidence of the structure by transmitting the load of the structure to a support layer with high bearing capacity, and is called a pile foundation method depending on the pile construction. Pile types include PHC piles, steel pipe piles, and micropiles ( micropile), etc. are being used.

Here, the micropiles have a smaller diameter than PHC piles or steel pipe piles, and are mainly used when entry of large construction equipment is difficult or vibration occurring during construction is a problem.

As such, the construction method using a micropile involves forming a hole in the ground, inserting a casing to prevent the collapse of the hole in the soil layer, assembling reinforcement in the micropile and installing it in the hole, pressurizing injection of grouting material in the support layer, installing a plate, and basic concrete. It is constructed in the order of pouring and curing.

At this time, the micropiles must be connected and used according to the depth of the drill hole formed in the ground, while the casing placed outside the micropile and used to prevent the collapse of the drill hole must also be connected and used.

In other words, micropiles are fixedly installed within the foundation concrete to reinforce the ground or protect the structure in the event of an earthquake.

Meanwhile, the micropile is manufactured by cutting a rod body with a certain length through a rolling process to form threads on the outer surface, and cutting oil is essentially used during the rolling process for forming the threads.

In this way, the micropile remains with the cutting oil used during the rolling operation for thread processing on the outer surface, is installed on the ground with the cutting oil remaining, and is finally cured after pouring the basic concrete made of cement material. It is fixed in contact with the concrete.

However, the micropile, which is installed in the ground and is finally contacted and fixed to the concrete, is deformed due to the action of cutting fluid, which is an oil component, and gradually develops into a form where a gap is formed, so the fixing force within the concrete is significantly reduced and the bonding strength with the concrete is significantly reduced. This causes the problem of deterioration.

In addition, in the related art, the cutting oil remaining in the micropile acts as a factor in generating heat in the micropile itself, thereby causing rust in the micropile despite the use of a rust preventive.

Due to this, the micropiles conventionally used for ground reinforcement and earthquake-resistant design are rusted, lose their fixation force and become unstable, which has a significant impact on safety and stability, and improvements are required.

In addition, the cutting oil remaining in the conventional micropile is mixed with impurities generated during the process of cutting the thread during the rolling operation to form the thread, so it is smeared on the micropile as dirty oil. Since micropiles are inserted into the ground and the foundation concrete is poured and then cured, it has a harmful effect within the ground and causes the problems described above.

Accordingly, the industry is in dire need of improvements in the manufacturing, use, and construction of micropiles, and in particular, the incorporation of micropiles that can demonstrate environmental friendliness is required.

Meanwhile, as prior art documents, 'Micropile for maintaining support area by preventing corrosion of thread bar and its construction method' disclosed in Domestic Patent No. 10-1918125 and Domestic Patent No. 10-1201829. Although it may refer to 'microfile', it can be said to have a significant difference in terms of composition and operation from the technology of the present invention proposed below.

Republic of Korea Patent Publication No. 10-1918125 Republic of Korea Patent Publication No. 10-1201829

The present invention was developed in consideration of and to solve the above-mentioned conventional problems. It has an interfacial activity that reduces the interfacial tension of the cutting oil used during rolling for thread processing, making it non-slippery and providing excellent fixation, and has excellent fixation properties and rust prevention properties. The purpose is to provide an eco-friendly micropile and its manufacturing method that can secure protective functions and increase the bonding strength between concrete and piles.

The present invention forms a coating layer to provide rust prevention to the file, which not only blocks the harmful effects of cutting oil, but also protects the file from moisture in the air or rain, and has excellent miscibility with the cutting oil remaining in the file. The purpose is to provide an eco-friendly micropile and a manufacturing method thereof that enable excellent fixation during construction by performing an interfacial activity that reduces the interfacial tension of cutting oil.

The present invention is an eco-friendly micro that forms a coating layer to provide rust prevention to the pile, and the coating layer reacts with the pile, which is a metal component, to provide excellent adhesion and at the same time maintains excellent bonding strength by reacting with concrete, which is an alkaline component. The purpose is to provide files and their manufacturing methods.

The eco-friendly micropile according to the present invention for achieving the above object is a micropile that is a rod body with a certain length and diameter and has threads formed on the outer surface, and improves the fixation and rust prevention of the micropile during construction. A coating layer is formed on the outer surface of the micropile to improve bonding with concrete, and the coating layer is formed of a coating agent containing a C ₃ H ₅ KNaO ₅ S compound.

Here, the C ₃ H ₅ KNaO ₅ S compound may be composed of 2-propenoic acid, telomer with sodium hydrogen sulfite, and potassium salt.

Here, the coating agent may be composed of a mixture of water and C ₃ H ₅ KNaO ₅ S compounds.

Here, the coating agent may be composed of a mixture of 73 to 77% by weight of water and 23 to 27% by weight of C ₃ H ₅ KNaO ₅ S compound.

Here, the components constituting the C ₃ H ₅ KNaO ₅ S compound, 2-propenoic acid: telomer with sodium hydrogen sulfite: potassium salt, may be mixed at a weight ratio of 1:1:1.

In addition, the eco-friendly micropile manufacturing method according to the present invention to achieve the above object is a micropile manufacturing method comprising a first step of forming a screw thread on the outer surface of a rod having a certain length and diameter,

An eco-friendly micropile is created by forming a coating layer on the outer surface of the rod body on which the screw thread is formed through the first process, by applying a coating agent to improve the fixation and rust prevention of the micropile and to improve bonding with concrete during construction. It further includes a second process for completion, and the coating agent is characterized in that it consists of a mixture of 73 to 77% by weight of water and 23 to 27% by weight of C ₃ H ₅ KNaO ₅ S compound.

The C ₃ H ₅ KNaO ₅ S compound may be composed of 2-propenoic acid, telomer with sodium hydrogen sulfite, and potassium salt.

The components constituting the C ₃ H ₅ KNaO ₅ S compound, 2-propenoic acid: telomer with sodium hydrogen sulfite: potassium salt, may be mixed in a weight ratio of 1:1:1.

Here, the first process forms a screw thread through rolling processing in a rolling machine, and the second process forms a screw thread discharged from the rolling machine through a conveying guide member of the tubular body positioned in front of the outlet direction of the rolling machine. A configuration that completes an eco-friendly micropile by transporting the loaded rod body forward and guiding it to pass through the inside of the coating machine, and automatically applying a coating agent to the outer surface of the rod body where the thread passing through the inside is formed in the coater to form a coating layer. It can be.

Here, each of the transfer guide member and the coating machine may be configured to be height-adjustable.

According to the present invention, the micropile itself can be made non-slippery and have excellent fixation through an interfacial activity that reduces the interfacial tension of the cutting oil used during the rolling operation for thread processing, and the file protection function by rust prevention can be secured. It can provide a useful effect of increasing the bonding strength between concrete, a cement material, and micropiles.

According to the present invention, by forming a coating layer to provide rust prevention to the micropile, it is possible to block the harmful effects of cutting oil remaining from rolling, as well as to safely protect the file from moisture in the air or rain, and to safely protect the micropile from moisture in the air or rain. It can provide a useful effect of excellent fixation to the micropile itself during construction by performing an interfacial activity that reduces the interfacial tension of the cutting oil while maintaining excellent miscibility with the remaining cutting oil.

According to the present invention, it is possible to form a coating layer according to the use of a coating agent to provide rust prevention to the micropile and provide a micropile with more durability than the existing one, and the coating layer of the micropile reacts with the pile containing a metal component. This provides excellent adhesion and at the same time provides the useful effect of maintaining excellent bonding strength through reaction with concrete, which is an alkaline component.

According to the present invention, it is possible to improve its own durability while demonstrating superior eco-friendliness compared to the existing one, and to provide useful effects such as improving operability and economic efficiency during construction and use.

Figure 1 is a process diagram showing an eco-friendly micropile manufacturing method according to an embodiment of the present invention.
Figure 2 is a schematic configuration diagram showing a device used for manufacturing an eco-friendly micropile according to an embodiment of the present invention.
Figure 3 is a photograph showing a device used for manufacturing an eco-friendly micropile according to an embodiment of the present invention.
Figure 4 is a photograph showing a state in which a coating process is performed in a coater in the manufacture of an eco-friendly micropile according to an embodiment of the present invention.
Figure 5 is a photograph showing an eco-friendly micropile having a coating layer manufactured by an eco-friendly micropile manufacturing method according to an embodiment of the present invention.
Figure 6 is a sample photograph showing the coating agent used in the production of an eco-friendly micropile according to an embodiment of the present invention.

Preferred embodiments of the present invention will be described with reference to the accompanying drawings as follows. Through this detailed description, the purpose and configuration of the present invention and its characteristics will be better understood.

The eco-friendly micropile and its manufacturing method according to an embodiment of the present invention can be described with reference to FIGS. 1 to 6.

The eco-friendly micropile according to an embodiment of the present invention is used for ground reinforcement and earthquake-resistant design during the construction of building structures or civil engineering structures, etc., and is made of a rod body with a certain length and diameter, and a screw thread is formed on the outer surface.

In this way, a coating agent is applied to the surface of the rod body with threads formed on the outer surface to form a coating layer.

The coating layer formed by applying the coating agent not only improves the fixation and rust prevention of the micropile during construction, but also acts to improve the bonding strength with concrete composed of cement material.

For this purpose, the coating layer is formed with a coating agent containing a C ₃ H ₅ KNaO ₅ S compound.

The C ₃ H ₅ KNaO ₅ S compound included in the coating agent is preferably composed of 2-propenoic acid, telomer with sodium hydrogen sulfite, and potassium salt.

The C ₃ H ₅ KNaO ₅ S compound contained in the coating agent may have the chemical structural formula shown below.

(Chemical structural formula)

At this time, the components constituting the C ₃ H ₅ KNaO ₅ S compound, 2-propenoic acid: telomer with sodium hydrogen sulfite: potassium salt, may be mixed at a weight ratio of 1:1:1.

When looking in more detail, the coating agent in the present invention for the coating layer as described above may be composed of a mixture of water and a C ₃ H ₅ NaO ₅ S compound.

At this time, the coating agent is preferably composed of a mixture of 73 to 77% by weight of water and 23 to 27% by weight of C ₃ H ₅ KNaO ₅ S compound.

The coating agent composed in this way has the form of a liquid sample as shown in FIG. 6 and can be defined as a resin with a relatively negative tendency.

Meanwhile, a manufacturing method for manufacturing an eco-friendly micropile having the coating layer described above will be described below, with reference to FIGS. 1 to 6.

As shown in FIG. 1, the eco-friendly micropile manufacturing method according to the present invention includes a forming process as the first process (S100) and a coating process as the second process (S200).

The first process (S100) is a known process of forming threads on the outer surface of a rod having a certain length and diameter, and rolling processing is performed using a rolling machine 100, a known device.

The second process (S200) can be said to be a core process of the present invention, and a coating layer is formed by applying a coating agent to the outer surface of the rod body on which the thread is formed through the first process (S100) as described above, as shown in FIG. 5. This is a process to complete an eco-friendly micropile like the bar.

By forming a coating layer using the coating agent on the surface, the function of covering the cutting oil on the rod can be performed. Through this, the harmful effects of the cutting oil that inevitably remain in the first process can be blocked, and in addition, It can perform the function of protecting micropiles from moisture in the air or rain.

In particular, the present invention improves the fixation and rust prevention of the micropile during construction through the formation of a coating layer, as well as improving the bonding strength with concrete.

For this purpose, the coating agent consists of a mixture of 73 to 77% by weight of water and 23 to 27% by weight of C ₃ H ₅ KNaO ₅ S compound.

The water is used for dispersing the C ₃ H ₅ KNaO ₅ S compound, and has the property of being scattered and removed when dried after coating.

The C ₃ H ₅ KNaO ₅ S compound is composed of 2-propenoic acid, telomer with sodium hydrogen sulfite, and potassium salt, and improves the fixation and rust prevention of the micropile during construction as well as the bonding strength with concrete. performs its function.

At this time, the components constituting the C ₃ H ₅ KNaO ₅ S compound, 2-propenoic acid: telomer with sodium hydrogen sulfite: potassium salt, may be mixed at a weight ratio of 1:1:1.

The coating agent having such a composition and the coating layer formed on the surface using the same, especially the C ₃ H ₅ KNaO ₅ S compound, have a component that has excellent miscibility with the cutting oil remaining in the pile (rod) after the first process. Even if cutting oil remains on the surface of the threaded rod, it performs an interfacial activity that reduces the interfacial tension of the cutting oil. As a result, it exhibits excellent fixation to the micropile during construction and acts non-slippery, so the micropile itself is not slippery. It can increase the fixation of .

In addition, the coating layer containing the C ₃ H ₅ KNaO ₅ S compound forms a film while covering the cutting oil remaining on the pile (rod body) that has completed the first process, thereby providing rust prevention to the micropile and protecting it from damage in the air or in rainy weather. It functions to protect micropiles by blocking moisture.

In addition, the coating layer containing the C ₃ H ₅ KNaO ₅ S compound has a strong bond with the cement components due to the alkaline action of the main material, cement, dissolving the coating layer during curing after the final foundation concrete is poured during the construction of the micropile. A bonding force is formed, and as a result, a strong bonding force can be formed at the contact area between the concrete hardened by curing and the micropile, thereby improving the fixation and bonding force of the constructed micropile and preventing separation and shaking from the concrete. Therefore, the formation of a coating layer alone can provide the advantage of greatly increasing safety and stability compared to the existing one.

In addition, the coating agent used in the present invention is a resin containing a C ₃ H ₅ KNaO ₅ S compound, and as described above, it exhibits negative (-) properties, and is a metal component with positive (+) properties. It can increase adhesion and bonding to the surface of the pile side, and since the cement component also has positive properties, it can increase adhesion and bonding with concrete and prevent neutralization and rapid aging of concrete. can do.

As can be seen in FIGS. 3 and 4, the second process (S200) of forming a coating layer using the above-described coating agent involves the transfer of the tubular body positioned in front of the outlet direction of the rolling machine 100 in the first process (S100). The threaded rod discharged from the rolling machine 100 through the guide member 200 is rotated forward and guided to pass through the interior of the coating machine 300.

Then, the coating agent 300 automatically pumps and applies the coating agent, which is the sample shown in FIG. 6, to the outer surface of the rod body on which threads passing through the interior are formed to form a coating layer.

At this time, each of the transfer guide member 200 and the coating machine 300 is preferably configured to be height-adjustable so that workability and work convenience can be taken into consideration by providing a height customized to the rolling machine 100 being used.

Accordingly, an eco-friendly micropile with a coating layer as shown in Figure 5 can be completed, and the durability of the pile itself can be improved while demonstrating superior eco-friendliness compared to the existing one, and the functions for ground reinforcement and earthquake-resistant design are further improved. It can be performed effectively, and it can provide very useful advantages that can greatly increase the operability, economic efficiency, and functionality of the construction and use of micropiles.

The embodiments described above merely describe preferred embodiments of the present invention and are not extremely limited to these embodiments. Various modifications and variations can be made by those skilled in the art within the technical spirit and scope of the claims of the present invention. Or, substitution of steps, etc. may be made, and this will be said to fall within the scope of technical rights of the present invention.

100: precursor
200: Transfer guide member
300: Coating machine

Claims (10)

In the micropile, which is a rod body with a certain length and diameter and has threads formed on the outer surface,
During construction, a coating layer is formed on the outer surface of the micropile to improve the fixation and rust prevention of the micropile and to improve bonding strength with concrete.
An eco-friendly micropile, wherein the coating layer is formed of a coating agent containing a C ₃ H ₅ KNaO ₅ S compound. According to clause 1,
The C ₃ H ₅ KNaO ₅ S compound,
An eco-friendly micropile characterized by consisting of 2-propenoic acid, telomer with sodium hydrogen sulfite, and potassium salt. According to clause 1,
The coating agent,
An eco-friendly micropile consisting of a mixture of water and C ₃ H ₅ KNaO ₅ S compounds. According to clause 1,
The coating agent,
An eco-friendly micropile consisting of a mixture of 73 to 77% by weight of water and 23 to 27% by weight of C ₃ H ₅ KNaO ₅ S compound. According to clause 2,
An eco-friendly micropile, characterized in that the components constituting the C ₃ H ₅ KNaO ₅ S compound, 2-propenoic acid: telomer with sodium hydrogen sulfite: potassium salt, are mixed in a weight ratio of 1:1:1. In a micropile manufacturing method comprising a first step of forming a screw thread on the outer surface of a rod having a certain length and diameter,
An eco-friendly micropile is created by forming a coating layer on the outer surface of the rod body on which the thread is formed through the first process, by applying a coating agent to improve the fixation and rust prevention of the micropile and to improve the bonding strength with concrete during construction. It further includes a second process to complete,
The coating agent is an eco-friendly micropile manufacturing method, characterized in that it consists of a mixture of 73 to 77% by weight of water and 23 to 27% by weight of C ₃ H ₅ KNaO ₅ S compound. According to clause 6,
The C ₃ H ₅ KNaO ₅ S compound,
An eco-friendly micropile manufacturing method characterized by consisting of 2-propenoic acid, telomer with sodium hydrogen sulfite, and potassium salt. According to clause 7,
An eco-friendly micropile manufacturing method, characterized in that the components constituting the C ₃ H ₅ KNaO ₅ S compound, 2-propenoic acid: telomer with sodium hydrogen sulfite: potassium salt, are mixed in a weight ratio of 1:1:1. According to clause 6,
The first process forms screw threads through rolling processing in a rolling machine,
In the second process, the threaded rod discharged from the rolling machine is transferred forward through the transport guide member of the tubular body positioned in front of the exit direction of the rolling machine, and is guided to pass through the interior of the coating machine. An eco-friendly micropile manufacturing method characterized in that an eco-friendly micropile is completed by automatically applying a coating to the outer surface of a rod body having threads passing through the inside to form a coating layer. According to clause 9,
An eco-friendly micropile manufacturing method, characterized in that each of the transfer guide member and the coating machine is provided so that the height can be adjusted.