KR102044636B1 - Concrete pile - Google Patents

Abstract

The present invention relates to a concrete pile, wherein a plurality of hollow holes (110) having identical or different diameters are penetrated in a longitudinal direction at a central portion of a concrete pile (100) such that grout (130) and a reinforcing material (120) may be injected thereinto. Here, the hollow holes (110) are arranged in a ring shape according to a predetermined pattern so as to be located at an identical distance from the center as for each diameter. A plurality of grout holes (111) are arranged with uniform intervals at upper and lower portions in the hollow holes (110), to be horizontally penetrated from an inner circumferential surface of one side towards an outer circumferential surface of the concrete pile (100). In addition, the grout holes (111) are radially disposed from the plurality of hollow holes (110) such that the grout (130) injected into the hollow holes (110) may be diffused to a soft ground around the concrete pile (100), in order to form a reinforcing unit (131). Therefore, the concrete pile of a high quality is provided, which embodies high strength and high density while having a light weight.

Description

Concrete pile {CONCRETE PILE}

The present invention relates to a concrete pile, more specifically, in the construction of a concrete pile to form a pile foundation of civil engineering and buildings by injecting and installing inside the perforated hole formed in the ground, the configuration different from the existing concrete pile It relates to a concrete pile that implements high strength and high density compared to lightweight.

In general, when the ground of soft ground such as sand, clay and gravel is distributed deeply below the ground surface in civil engineering and building construction, it is impossible to establish the direct foundation of the structure because it is difficult to secure sufficient bearing capacity because of its high compressibility and softness. .

In other words, in a rock foundation or SPT, where a direct foundation can be established, a high quality layer, such as sandy soil with an N value of 30 or more, or a clay layer with an N value of 20 or more, has no ground with sufficient depth, or In case of insufficient depth, direct foundation cannot effectively transfer the load of the structure to the ground, so install pile foundation as a foundation to support the structure.

Foundation piles are generally long structures having a ratio of penetration depth to foundation width of 4 or more, and are foundations that are driven to a predetermined depth by embedding after impact, vibration, or excavation. Therefore, it supports the load of the upper structure and transmits a good supporting force to the lower strata.

The basic pile includes concrete piles, steel piles, and concrete steel pipe composite piles depending on the material.

Concrete piles are generally used in a variety of foundation piles because they are rich in durability, easy to manufacture in arbitrary lengths and cross sections, and have the advantage of being able to select strength according to the ground.

Ready-made concrete piles, which are mainly used in Korea, are manufactured by molding concrete in factories and are divided into reinforcing bars or steel wires and non-reinforcing bars. Reinforced concrete piles or prestressed concrete piles are usually used.

Existing concrete piles are composed of cement, sand and gravel at a ratio of about 1: 3: 6 as main aggregate raw materials, but they have the disadvantages of environmental damage and economic burden due to the collection of aggregates. In particular, since the compressive strength of general concrete ranges from about 210 to 240 kgf / cm ^2, it is difficult to achieve high strength only by the concrete pile itself.

Recognizing the problems as described above, the construction of a concrete pile using a variety of raw materials has been developed in recent years to look at the schematic configuration through a known technique.

As an example, Korean Laid-Open Patent Publication No. 10-2014-0028361 includes 10 to 17% by weight of cement, 5 to 10% by weight of water, and 42 to 52% by weight of coarse aggregate having a particle diameter of more than 8 mm and 25 mm or less, including steelmaking slag, Concrete pile cured with a ready-mixed concrete composition composed of 16 to 30% by weight of small aggregates containing coal ash, 0.01 to 8% by weight, 1 to 4% by weight of silicon dioxide, 0.1 to 0.4% by weight of admixtures, and other unavoidable impurities Configure

As another example, Korean Laid-Open Patent Publication No. 10-2015-0068101 discloses 20 to 50% by weight of one type of ordinary portland cement, 40 to 65% by weight of blast furnace slag fine powder composed of slag and natural anhydrous and desulfurized gypsum, and limestone and fine particles. A cement mixture comprising 5-15% by weight of a high powder binder made of cement, water, fine aggregates having a maximum dimension of 25 mm or less, coarse aggregate, and a concrete composition for concrete piles comprising admixtures.

Korean Patent Publication No. 10-2014-0028361 (2014.03.10) Korean Patent Publication No. 10-2015-0068101 (2015.06.19) Korea Patent Registration No. 10-1477145 (2014.12.22) Korean Patent Publication No. 10-2007-0005645 (2007.01.10)

Conventional concrete piles are used as raw materials for cement, sand, and gravel as main raw materials, but there are problems such as environmental damage and resource depletion due to the collection of aggregates, as well as economic burden due to rising raw material costs.

In order to overcome this problem, in the concrete pile manufacturing method to which the prior art is applied, steelmaking slag and coal ash are used as aggregates instead of sand or gravel to replace existing aggregates and form and cure with admixtures. do.

However, the concrete pile has a certain level of compressive strength for the compressive force in the axial direction due to the physical characteristics of the raw material, but only 1/10 of the compressive strength for the horizontal force, so the concrete pile is difficult to achieve high strength alone.

Although, in the prior art, the aggregate content such as slag or coal ash is formed several times compared to the amount of cement, and the aggregate size and strength are provided to a certain level or more to secure high compressive strength. The problem is that the moldability and density of the pile are reduced and the weight is incurred, leading to the deterioration of handling and installation.

In addition, when reinforcing the steel reinforcement in the concrete pile according to the prior art due to the chemical properties of the main material cement reacts with water or moisture permeating in the ground causes a problem of accelerating the corrosion of the steel or eluting heavy metals.

In the present invention, to solve the problems of the prior art as described above,
A raw material blending process including waste glass glass powder, cement, water and a high performance water reducing agent, and further blending one or more selected from red mud, silica fume, waste foundry sand and bentonite solution to increase density and strength, forming, curing and drying. In the concrete pile which is manufactured through the process and infiltrated and installed in the perforated hole formed in the ground to form the pile foundation of civil engineering and building,
Inside the concrete pile 100 to form a hollow 110 to penetrate the grout 130 and the reinforcing material 120,
The hollow 110,
It is provided with a plurality of the same or different diameters formed in the longitudinal direction of the concrete pile 100,
The plurality of hollows 110,
Formed by placing in an annular shape according to a predetermined pattern to be located on the same distance from the center for each hollow 110 made of the same diameter,
In each of the plurality of hollow 110, a plurality of grout holes 111 formed to penetrate horizontally toward the outer circumferential surface of the concrete pile 100 from one inner circumferential surface, and arranged at regular intervals,
The plurality of grout holes 111,

It is configured to form a reinforcement part 131 by radially provided from the hollow 110 to diffuse the grout 130 injected into the hollow 110 to the soft ground around the concrete pile 100.

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Therefore, it is possible to achieve the purpose of providing a high-quality concrete pile that implements high strength and high density compared to light weight.

The present invention provides a concrete pile that implements a compressive strength of at least 400kgf / cm ^{2 with} only the concrete pile itself through a configuration different from the existing concrete pile.

Therefore, the present invention has the advantage of providing a high quality concrete pile excellent in formability and installation, durability through a series of manufacturing processes that can implement high strength and high density compared to light weight.

In addition, the present invention derives the effect of providing a concrete pile significantly improved compressive strength as the curing process in proportion to the weight of the concrete pile to be produced.

In addition, the present invention has economical and environmental benefits as well as effectively utilize waste resources, as well as preventing salt and acid resistance to eliminate heavy metals from cement raw materials or corrosive reinforcement, construction with reinforcing materials It has various advantages such as forming a more stable support structure.

1 is a schematic process flow diagram of a method of manufacturing a concrete pile according to the present invention.
2 to 3 is a perspective view and a front view of a concrete pile produced according to the method of manufacturing a concrete pile of the present invention.
4 is a cross-sectional view taken along the line AA of FIG.
5 is a cross-sectional view taken along the line BB of FIG.
6 to 7 is an exemplary view showing a state of use of the concrete pile produced according to the method of manufacturing a concrete pile of the present invention.

Hereinafter, the configuration and operation according to a preferred embodiment of the concrete pile of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of parts that can be easily implemented by those skilled in the art may be omitted. In addition, the following description is to be described with reference to a preferred embodiment of the present invention, the present invention is not limited by the following examples and it is natural that various modifications can be provided within the scope without departing from the scope of the invention will be.

1 is a schematic process flow chart of a method of manufacturing a concrete pile according to the present invention, Figures 2 to 3 are a perspective view and a front view of a concrete pile manufactured according to the method of manufacturing a concrete pile of the present invention, Figure 4 is Sectional view taken along line AA, Figure 5 is a cross-sectional view taken along line BB of Figure 4, Figure 6 to Figure 7 shows an example of the state of use of the concrete pile produced according to the method of manufacturing a concrete pile of the present invention.

It is noted that the concrete pile to which the technique of the present invention is applied relates to a high quality concrete pile 100 that can realize high strength and high density compared to light weight through a configuration different from that of the existing concrete pile.

The concrete pile of the present invention for this purpose is manufactured through the raw material mixing process (S10), molding process (S20), curing process (S30), and drying process (S40), infiltrated and installed inside the drilling hole formed in the ground And it constitutes a concrete pile to form the pile foundation of the building, first look at the manufacturing process as follows.

In the raw material mixing step (S10), 10 parts by weight of finely ground glass powder, which has been pulverized waste glass to a particle size of 10 μm or less, dry weight stirring of 20 parts by weight of cement, followed by mixing 8 parts by weight of water and 0.3 parts by weight of a high performance water reducing agent. It is a process of forming mortar by stirring.

The glass powder is formed by collecting various glass products discarded after use and pulverizing into fine particles of 10 μm or less. As described above, limiting the particle size of the glass powder is to reduce the friction between the glass powder particles during agitation and to obtain high density while reducing the friction between the glass powder particles during the agitation process. Since it is preferable to form in the particle size range.

The cement is used in the general cement, but in the conventional concrete manufacturing, apart from the composition of stirring the aggregate and water together, the glass powder and cement in a dry state in the dry powder to form an even mixing state.

The superplasticizer improves workability and formability by imparting fluidity during wet stirring and dispersing cement particles, and in particular, reduces the amount of unit by 20 to 30%, thereby enhancing strength. Generally, high performance reducing agents are classified into naphthalene-based, melamine-based, and polycarboxylic acid-based compounds. Polycarboxylic acid-based compounds having a relatively close pH to neutral are effective, but may be selected as necessary.

Wet agitation is performed by adding a high performance water reducing agent together with water to the dry stirred glass powder and cement mixture as described above. If the blending ratio of the high-performance reducing agent is out of the above range, the viscosity and flowability may worsen during the stirring operation, it is preferable to comply with the above range because the addition of water causes a decrease in strength.

In addition, in the raw material blending step (S10), the density and the combination of one or more selected from the total weight of the raw material, 4 parts by weight of neutralized red mud, 2 parts by weight of silica fume, 20 parts by weight of waste foundry sand, 5 parts by weight of bentonite solution Enhancing strength.

The red mud may be obtained through insoluble residues remaining after extracting alumina powder by heating and dissolving bauxite as a raw material in aluminum smelting process under high temperature and high pressure with caustic soda. Due to the development of the aluminum industry, a large amount of red mud inventory is required, which requires a treatment plan and a low price.

Since the red mud contains a large amount of iron oxide, aluminum oxide, and silicon oxide, the pores of the cement particles are compacted, the strength is enhanced, and the hardening property is imparted. In addition, red mud has strong alkalinity due to the sodium aluminate and sodium carbonate components included in the caustic soda used in the extraction process. Therefore, red mud is used to control heavy metals such as copper, zinc, chromium, lead, and cadmium. It acts to prevent elution by adsorption.

The silica fume is obtained by collecting and filtering ultrafine silicon oxide of 0.1 μm or more contained in a gas generated in a silicon manufacturing process. More than 90% is made of silicon oxide and forms about 1/25 particle size of cement particles to fill the pores between particles, and reacts with calcium hydroxide generated during the hydration reaction of cement to improve strength and durability. As a substitute for silica fume, metakaolin, which is a relatively inexpensive compound containing silicon oxide, can be applied.

The waste foundry sand is a waste generated when dismantling the sand mold to mold the casting. The sand mold is manufactured by adding a caking additive to the foundry sand, and since the mold loses its function as a mold after being used once, waste molding sand occurs during the dismantling process. Since most of the waste foundry sand is being disposed of in the raw material blending process (S10) of the present invention, the waste foundry sand is recycled and used instead of ordinary sand.

The bentonite solution is a solution in which water is adsorbed onto bentonite. Bentonite is a mineral inorganic material that has a property of expanding about 10 to 15 times in the volume of the raw material when reacted with water. Therefore, when the bentonite solution is added in the raw material mixing process (S10), the bentonite solution forms a swelling state, compresses voids inevitably generated in the stirring process of the raw materials, and aggregates the other raw materials to increase the bonding force, thereby increasing the density of mortar. Act to improve it.

Therefore, in the raw material blending process (S10), a glass powder, a high performance water reducing agent, cement, and red mud, silica fume, waste casting sand, and bentonite are used to form mortar, and other aggregates such as gravel are configured to be added. Such raw material composition of the present invention is differentiated from the cement, sand, gravel as the main aggregate when manufacturing the existing concrete pile, while reducing the raw material cost and environmentally friendly effect of recycling the waste resources as described above while maintaining the strength and density Significantly improve.

On the other hand, the molding step (S20) is a step of injecting and molding the mortar formed by the above-described raw material mixing step (S10) into a cylindrical mold in which the core for forming the hollow 110 is arranged in an annular shape.

The mold used in the molding process (S20) is configured in the form of a cube, such as a cylindrical shape of a conventional pile, but inside or inside the concrete pile 100 manufactured by the present invention as shown in FIG. Since a plurality of hollows 110 having different diameters are formed to penetrate in the longitudinal direction to penetrate the grout 130 and the reinforcing member 120, the mold has a plurality of cores disposed at positions corresponding to the hollows 110. After molding mortar is injected.

Curing process (S30) is a process of demolding the molded product formed by the molding process (S20) and curing under watering for 5 to 30 days in proportion to the weight of the molding.

In general, the concrete pile molding is subjected to a curing process for promoting hardening by the hydration reaction of cement. In the curing process (S30) of the present invention, for example, the training for 5 days based on the weight of a cube molded sample having all sides 50 mm. It is configured to perform, and to increase the strength by increasing the curing period in proportion to the weight.

The drying step (S40) is a step of completing the concrete pile 100 by naturally drying the cured fish nurtured by the curing step (S30) for 3 to 4 days. Compression strength of the finished concrete pile 100 is configured to be made of 400kgf / cm ² or more.

<Test Example>

Hereinafter, an embodiment including a method for manufacturing the concrete pile of the present invention as described above, and performs a compressive strength test of the concrete pile accordingly.

After dry stirring 100 g of glass powder and 200 g of general cement, 80 ml of water and 3 g of a high performance water reducing agent were added, followed by wet stirring. Further, mortar was prepared by mixing an alternative material and gravel among 40 g of red mud, neutralized silica fume, 20 g of silica fume, 200 g of waste foundry sand, and 50 g of bentonite.

Concrete mortar sample is formed by injecting the mortar into a cube mold having a length of 50 mm on all sides of the inner mold.

After 5 days of training the sample under sprinkling, it is dried in natural state for 3 days to complete the concrete pile sample.

As a result of the above-mentioned concrete pile sample is put into the tester and pressurized until the sample is destroyed at the standard loading speed, and the compressive strength was measured, the minimum measured value was 400kgf / cm ² , and the curing period in the curing process (S30). The compressive strength of the concrete pile sample applied by 28 days was increased by about 2 times.

On the other hand, looking at the configuration of the concrete pile 100 according to the present invention manufactured according to the manufacturing method as described above are as follows.

As shown in Figures 2 to 3, the concrete pile 100 is made of a cylindrical shape, but the core portion is formed through the plurality of hollows 110 made of the same or different diameter in the longitudinal direction through the grout 130 and It is provided to penetrate the reinforcement (120).

The hollow 110 is disposed in an annular shape according to a predetermined pattern so as to be located at the same distance from the center for each hollow 110 made of the same diameter. For example, in the forming step (S20), four medium diameter cores are arranged in a ring shape at the core part of the mold, and four small diameter cores are arranged inside the medium diameter cores so that the hollow 110 is arranged as shown in FIG. ) Can be prepared.

In addition, the hollow 110 has a plurality of grout holes 111 formed horizontally penetrating toward the outer circumferential surface of the concrete pile 100 on one side inner circumferential surface, as shown in Figure 3 or 5 at regular intervals do.

The grout hole 111 is provided radially from the plurality of hollows 110 to diffuse the grout 130 injected into the hollow 110 to the soft ground around the concrete pile 100 to form a reinforcement portion 131. It is provided to.

That is, as shown in FIG. 4, the grout hole 111 is radially provided as it penetrates toward the outer circumferential surface of the concrete pile 100 at the closest distance from one inner circumferential surface of the individual hollow 110 arranged in an annular shape. Alternatively, as illustrated in FIG. 5, the grout 130 may be disposed at a predetermined interval in the longitudinal direction of the hollow 110 to spread the grout 130 over the periphery of the concrete pile 100.

Looking at the schematic construction method of the concrete pile applied to the technology of the present invention having the configuration as described above are as follows.

As shown in FIG. 6, one or more concrete piles 100 are connected to the pile connecting device 140 in a line and inserted therein according to the depth of the drilling hole formed in the ground.

As shown in FIG. 7, the concrete pile 100 may be penetrated to a depth capable of being fixed to the rock through the soft ground from the ground, but may be penetrated to a sufficient depth in the soft ground layer according to the installation environment.

A plurality of hollows 110 formed on the installed concrete pile 100 is installed by injecting a reinforcing member 120 made of one selected from steel rods, steel pipes, deformed reinforcing bars, steel wires, GFRP, BFRP, CFRP.

The reinforcing material 120 may be applied to a variety of standards corresponding to the size of the hollow 110, the hollow 110 and the reinforcing material 120 is provided so that the grout 130 is spaced apart a predetermined distance. do.

Since the hollow 110 penetrates the concrete pile 100 in the longitudinal direction, the reinforcement 120 penetrated through the hollow 110 is fixed to the lower ground to prevent buoyancy when the grout 130 is injected later and the concrete pile ( It is provided to improve the bearing capacity of 100).

As described above, the grout 130 is injected into the hollow 110 of the concrete pile 100 in which the reinforcing material 120 is installed by using a single packer, a double packer, or an air packer injection device. 111 is diffused radially around the concrete pile (100). The grout 130 is also supplied through the lower portion of the hollow 110.

Therefore, the reinforcement portion 131 of the grout 130 spread to the soft ground reinforces the soft ground while curing, and consequently, the concrete pile 100 and the reinforcement 120 and the grout 130 and the reinforcement portion 131 and The ground is integrated to secure the support of the structure while reinforcing the ground.

The concrete pile according to the present invention as described above is made to implement a higher strength than the prior art only by the concrete pile 100 itself through a configuration different from the existing concrete pile as described above.

Accordingly, the present invention can implement high strength and high density compared to light weight, and excellent in formability and installability, durability and high quality concrete pile (100) such as eliminating the problems of conventional concrete pile such as heavy metal dissolution and steel corrosion. There is an advantage to provide.

In addition, the present invention provides a concrete pile having various advantages economically and environmentally by effectively utilizing the waste resources to derive the physical and chemical properties of the concrete pile 100 different from the conventional one as described above. The availability is expected to be very large.

S10: raw material mixing process
S20: forming process
S30: Curing Process
S40: drying process
100: concrete pile
110: hollow
111: grouthole
120: reinforcement
130: grout
131: reinforcement
140: file connection device

Claims (3)

delete delete A raw material blending process including waste glass glass powder, cement, water and a high performance water reducing agent, and further blending one or more selected from red mud, silica fume, waste foundry sand and bentonite solution to increase density and strength, forming, curing and drying. In the concrete pile which is manufactured through the process and infiltrated and installed in the perforated hole formed in the ground to form the pile foundation of civil engineering and building,
Inside the concrete pile 100 to form a hollow 110 to penetrate the grout 130 and the reinforcing material 120,
The hollow 110,
It is provided with a plurality of the same or different diameters formed in the longitudinal direction of the concrete pile 100,
The plurality of hollows 110,
Formed by placing in an annular shape according to a predetermined pattern to be located on the same distance from the center for each hollow 110 made of the same diameter,
In each of the plurality of hollow 110, a plurality of grout holes 111 formed to penetrate horizontally toward the outer circumferential surface of the concrete pile 100 from one inner circumferential surface, and arranged at regular intervals,
The plurality of grout holes 111,
Concrete pile, characterized in that configured to form a reinforcement portion 131 to radially provided from the hollow 110 to diffuse the grout (130) injected into the hollow 110 to the surrounding soft ground of the concrete pile (100).

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