KR20070119130A - Method of carrying out underground pile with expanded bulbs and pile with expanded bulbs thereof - Google Patents

Abstract

An underground pile having an expanded bulb and a construction method thereof are provided to form an expanded bulb projected to the bottom or middle of a pile simultaneously when tamping earth around the pile and to construct an underground pile having large bearing capacity with low expenses in a short time. A construction method of an underground pile having an expanded bulb using a rapidly expanding metal compound capsule comprises the steps of perforating a hole(3) on the ground(5) using an auger, filling uncured grout such as mortar, concrete, molten glass and asphalt to the perforated hole, inserting rapidly expanding metal compound capsules(100) containing a rapidly expanding metal compound of metal powder and metal salts to the inside of the grout at different heights to form an expanded bulb, exploding and expanding the rapidly expanding metal compound and the rapidly expanding metal compound capsule by connecting a contact-detonating device(113) to a power supply line(111) and expanding the ground around the rapidly expanding metal compound capsule, and filling grout to the expanded part.

Description

Method for constructing underground piles with expanded bulbs and underground piles with expanded bulbs constructed by the method {METHOD OF CARRYING OUT UNDERGROUND PILE WITH EXPANDED BULBS AND PILE WITH EXPANDED BULBS THEREOF}

1A to 1G are construction views showing step by step underground construction method having an expansion bulb according to the present invention.

Figure 2 is a cross-sectional view of the rapid expansion metal mixture capsule used in the underground pile construction method having an expansion bulb according to the present invention.

              Explanation of symbols on the main parts of the drawings

1: Auger 3: Hole

5: ground 7: grout

9: underground file 11: expansion bulb

100: expansion metal mixture capsule 101: expansion metal mixture

103: inner shell 105: outer shell body

107a and 107b: jacket cap 109: resistance wire

111: power supply line 113: trigger device

The present invention relates to a method for constructing ground piles for ground reinforcement, and more particularly, to a method for constructing ground piles for ground reinforcement in which expansion bulbs are formed in the middle or lower portion of a pile.

In constructing structures such as buildings, railroad rails, and piers on soft ground, pile foundations are frequently used to prevent settlement of structures and to secure support for them.

In constructing pile foundations, underground piles are formed by driving or purchasing pre-made concrete piles, and by filling holes in the ground and filling grouts such as mortar, concrete, molten glass, and asphalt. Method is used. The present invention particularly relates to a method of forming underground piles by drilling holes in the ground in the field and filling grout such as mortar.

The applicant of the present application is a metal salt which is an oxidizing agent in Korean Patent Registration No. 10-0213577 and Korean Patent Laid-Open Publication No. 2003-6083, a metal powder whose volume is increased by exothermic reaction while being oxidized by the metal salt, and the metal salt Disclosed is a rapid expansion metal mixture comprising a reaction accelerator for promoting an oxidation reaction of a metal powder. The metal salt may be a metal nitrate, a metal oxide salt, a metal oxalate, a metal carbonate, a metal sulfate, and the like, and the metal powder may be a metal which can be used as aluminum, manganese, magnesium and other reducing agents. In addition, the applicant discloses an oxidation-expansion-expanded metal mixture at room temperature in which oil or an inorganic preservative is added to a rapidly-expanded metal mixture containing metal salt and metal powder in Korean Laid-Open Patent Publication No. 2003-37707.

In the present invention, the rapid expansion metal mixture is the rapid expansion metal mixture described in the above-described Korean Patent Registration No. 10-0213577, Korean Laid-Open Patent Publication No. 2003-6083 or Korean Laid-open Patent Publication No. 2003-37707 Means.

When the rapid expansion metal mixture is triggered by a high-temperature flame (spark) or shock heat in a confined space, an ultra high temperature oxidation and reduction reaction occurs in a short time, forming an ultrahigh pressure metal and metal oxide vapor, and expanding rapidly. After expansion, when the expansion volume and the expansion pressure reach a certain level, the expansion energy is lost and immediately contracts to liquid or solid metal or metal oxide. This is because the dilatation system is small and thus exerts power only in a narrow space. By using the properties of such an expansive metal mixture, it is possible to perform noise-free, vibration-free, rock-free operation of succinic acid.

The present applicant has developed a method and apparatus for triggering the reaction of the rapidly expanding metal mixture and patented the Korean Patent Registration Nos. 10-283505 and 10-442551. Korean Patent Registration Nos. 10-283505 and 10-442551 have a high voltage applied to a conductor (resistance wire) embedded in a rapidly expanding metal mixture to cause a flame (spark) while the conductor is suddenly heated, and to the flame (spark) To ignite the expansive metal mixture.

Applicants have been carrying out many rock works in Korea and abroad using the above-expanded metal mixture and its trigger device. The present invention is a novel use invention of the above-expanded metal mixture.

1A-1C show a typical method used for conventional underground pile construction. According to the conventional conventional underground pile construction method, first, the auger 1 is drilled to form a straight hole 3 reaching a target depth and grout such as mortar, concrete, molten glass, asphalt, etc. using a hydraulic pump. After curing (grout), cure. The underground pile thus formed has a linear shape, and thus the structure bearing capacity is very low. Therefore, the method of drilling a straight hole until reaching a rock or selecting a large number of holes is selected. It is obvious that the deeper the hole or the larger the number of holes, the greater the amount of grout that must be filled in the hole, which is uneconomical. In addition, the perforation by the auger 1 not only forms a straight hole 3 but also has no soil compaction effect on the surrounding land. Therefore, even after the ground pile is formed, the surrounding ground of the ground file has a disadvantage in that it remains soft.

The present invention devised to improve the above-described prior art has an underground pile construction method that can form an expansion bulb protruding outward at the bottom or middle portion of the pile at the same time as the soil around the pile and having an expansion bulb constructed by the method It's about serving underground files.

It is another object of the present invention to provide a method for constructing a large pile of underground piles in a short time at low cost.

Another object of the present invention is to provide an underground pile having an extension bulb that can obtain greater bearing capacity while reducing pile length, more pile diameter and number of piles than a straight pile.

Underground pile construction method having an expansion bulb according to the present invention to achieve the above object is to fill the grout in the perforated hole in the ground, the metal powder and metal salt inside the grout before the grout is cured After inserting the expansive expanded metal mixture was mixed and detonated, the expansion and at the same time characterized in that the grout is filled in the expanded portion.

The expansive metal mixture is preferably contained within the steel sheath, fiber reinforced plastic sheath or polycarbonate sheath and inserted into the grout.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the underground pile construction method having an expansion bulb according to the present invention.

Figure 1a to 1g is a construction diagram showing a step by step underground construction method having an expansion bulb according to the present invention, Figure 2 is an expansion-expanded metal mixture capsule used in the underground pile construction method having an expansion bulb according to the present invention Sectional drawing of each is shown.

First, with reference to FIG. 2, the expansion metal mixture 101 and the capsule 100 in which the expansion metal mixture is used will be described.

The expansive metal mixture 101 is a mixture of a metal powder and a metal salt oxidized at high temperature by an oxygen atom of the metal powder in a mass ratio of 0.1: 99.9-99.9: .1. The metal salt is preferably one or a mixture of two or more of metal nitrate, metal perchlorate, metal peroxide salt, metal oxide salt, metal hydroxide, metal carbonate and metal sulfate. In addition, the metal powder is aluminum (A1), sodium (Na), potassium (K) lithium (Li), magnesium (Mg), calcium (Ca), manganese (Mn), barium (Ba), chromium (Cr), Preference is given to any one or mixture of two or more of silicon (Si).

The expansive metal mixture 101 is embedded in the inner skin 103 made of general synthetic resin such as PVC (polyvinyl chloride), and then resealed to the steel outer shell (105, 107a, 107b), fiber reinforced plastic shell or poly It is preferable that the inside of the carbonate shell is made in the form of a capsule 100. Examples of the fiber reinforced plastics include carbon fiber reinforced plastics and glass fiber reinforced plastics. Carbon fiber reinforced plastic, glass fiber reinforced plastic, or polycarbonate, which is a high strength prestick with good moldability without significant difference from steel jacket in terms of strength, can be used instead of steel. In order to oxidize and reduce the rapid expansion metal mixture 101, a high-temperature oxidation trigger temperature as well as a closed space in which a certain pressure is maintained is used, and thus the shell of the high-strength material is used. FIG. 2 illustrates an embodiment in which the shell is composed of an outer shell body 105 of a tubular body and outer shell caps 107a and 107b for closing both ends of the outer shell body 105. It is not limited to this, any structure can be any pressure-resistant sealed (耐壓 密閉) structure.

In the suddenly expanded metal mixture 101, a resistance line 109 for generating an electrical spark that may trigger an oxidation reaction is recessed, and the resistance line 109 is connected to a power supply line 111 and the power supply line 111 ) Is drawn out to the outside through the inner shell 103 and the outer shell 107a, 107b of the capsule 100 is connected to the triggering device 113 for generating a high voltage instantaneous voltage. When a high voltage is applied to the resistance line 109 by the triggering device 113, a rapid current and dissolution cause a discharge of a large current, and sparks (sparks) are generated by this discharge, which causes the rapid expansion metal mixture to detonate.

Hereinafter, referring to FIGS. 1A to 1G, a method of constructing an underground pile having expansion bulbs using the rapidly expanding metal mixture capsule 100 having the above-described configuration and operation will be described in detail.

FIG. 1A shows a process for drilling the hole 3 into the ground 5 by the auger 1, and FIG. 1B shows a grout such as mortar, concrete, molten glass, asphalt, etc. in the perforated hole 3. The process to make is shown. Although schematically shown in FIG. 1B, it is well known that the grout 7 fills the hole 3 with a hose while pressurizing with a pump.

When the grout 7 is filled to the vicinity of the ground as shown in FIG. 1C, the grout 7 is connected to the power supply line 111 by connecting the rapid expansion metal mixture capsule 100 to the required number as shown in FIG. 1D. Drop to the height where you want to form an expansion bulb inside. When the shells 105, 107a, and 107b of the expansion-expanded metal mixture capsule 100 are formed of steel, they are easily inserted into the grout 7 liquefied by their own weight, but the shell is fiber reinforced plastic or polycarbonate. Can be inserted using tools such as long poles. If you want to form two or more expansion bulbs by varying the height in the pile, the number of the expansion metal mixture capsule 100 by the number of different height is inserted.

When the insertion of the rapid expansion metal mixture capsule 100 is completed in the grout (7), as shown in Figure 1e by connecting the trigger device 113 to the power supply line 111 of the high pressure (3,000V or more) When the power is turned on, the rapid expansion metal mixture and the capsule 100 containing the same are detonated and expanded, and as shown in FIG. 1F, the ground 5 around the rapid expansion metal mixture capsule 100 is expanded. The expanded portion is immediately filled with grout 7. In this process, the surrounding ground of the expanded portion is firmly established. In addition, an empty space is generated in the upper portion of the hole 3 by the volume of the grout 7 filled in the expanded portion. In the case of using other explosives such as gunpowder, most of the grout 7 is scattered and discharged out of the hole by the blasting pressure, but when the expansive metal mixture 101 according to the present invention is used, the expansive metal mixture 101 is Since it expands immediately after the rapid expansion to a certain volume, the grout (7) is filled in the expansion portion without being discharged to the outside at all.

As shown in FIG. 1G, when the space generated in the upper part of the hole 3 is filled with the grout 7 and cured, a ground pile having an enlarged bulb formed at the lower or middle part is obtained.

According to the present invention having the above-described configuration, it is possible to form an expansion bulb protruding outward at the bottom or middle portion of the pile at the same time as the soil around the pile, and significantly reduce the construction period and construction cost of the pile having the expansion bulb Not only can it reduce the pile length, pile diameter and number of piles than straight piles, but it also has the effect of providing underground piles with greater bearing capacity.

Although the present invention has been described with reference to the embodiments shown in the accompanying drawings, the scope of protection of the present invention is not intended to be limited thereto, and the scope of protection of the present invention is set forth in the detailed description of the claims and all equivalent embodiments thereof. It should be interpreted as crazy.

Claims (6)

Filling the hole in the ground with uncured grout, inserting the expansive metal mixture mixed with metal powder and metal salt into the grout before curing, and detonating it. The underground pile construction method with an expansion bulb characterized by filling a grout in the part. The method of claim 1, The rapid expansion metal mixture is accommodated in a steel shell, fiber reinforced plastic shell or polycarbonate shell is underground pile construction method having an expansion bulb, characterized in that inserted into the grout. The method of claim 1, The expansion-expanded metal mixture is an expansion bulb, characterized in that the mixture of the metal powder and the metal salt oxidizing the metal powder at high temperature by the oxygen atom it has in a ratio of 0.1: 99.9-99.9: .1 mass ratio Underground file construction method having a. The method of claim 1, The metal salt is an underground pile construction method having an expanded bulb, characterized in that any one or a mixture of two or more of metal nitrate, metal perchlorate, metal peroxide, metal oxide salt, metal hydroxide, metal carbonate, metal sulfate. The method of claim 1, The metal powder is aluminum (A1), sodium (Na), potassium (K) lithium (Li), magnesium (Mg), calcium (Ca), manganese (Mn), barium (Ba), chromium (Cr), silicon ( The underground pile construction method with an expansion bulb characterized in that any one or a mixture of two or more of Si). The underground pile which has an expansion bulb constructed by the construction method of any one of Claims 1-5.

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