WO2007145468A1 - Method of constructing underground pile having expanded bulb and underground pile thereby - Google Patents
Method of constructing underground pile having expanded bulb and underground pile thereby Download PDFInfo
- Publication number
- WO2007145468A1 WO2007145468A1 PCT/KR2007/002861 KR2007002861W WO2007145468A1 WO 2007145468 A1 WO2007145468 A1 WO 2007145468A1 KR 2007002861 W KR2007002861 W KR 2007002861W WO 2007145468 A1 WO2007145468 A1 WO 2007145468A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- grout
- powder
- pile
- rapidly expanding
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 150000002736 metal compounds Chemical class 0.000 claims abstract description 41
- 239000002184 metal Substances 0.000 claims abstract description 39
- 229910052751 metal Inorganic materials 0.000 claims abstract description 37
- 239000011440 grout Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 31
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims description 5
- 239000011151 fibre-reinforced plastic Substances 0.000 claims description 5
- 239000011777 magnesium Substances 0.000 claims description 5
- 239000004417 polycarbonate Substances 0.000 claims description 5
- 229920000515 polycarbonate Polymers 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- 239000011734 sodium Substances 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 229910001960 metal nitrate Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052788 barium Inorganic materials 0.000 claims description 2
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052744 lithium Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 150000004972 metal peroxides Chemical class 0.000 claims description 2
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 claims description 2
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 claims description 2
- 229910052700 potassium Inorganic materials 0.000 claims description 2
- 239000011591 potassium Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 8
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 239000002689 soil Substances 0.000 abstract description 5
- 239000002775 capsule Substances 0.000 description 13
- 239000004567 concrete Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 238000005474 detonation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000006060 molten glass Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000004918 carbon fiber reinforced polymer Substances 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000011152 fibreglass Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 230000002421 anti-septic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
- E02D5/445—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile by application of pyrotechniques
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B33/00—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide
- C06B33/12—Compositions containing particulate metal, alloy, boron, silicon, selenium or tellurium with at least one oxygen supplying material which is either a metal oxide or a salt, organic or inorganic, capable of yielding a metal oxide the material being two or more oxygen-yielding compounds
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/123—Consolidating by placing solidifying or pore-filling substances in the soil and compacting the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
Definitions
- the present invention relates generally to methods of constructing underground piles for reinforcing the ground and, more particularly, to a method of constructing an underground pile having an expanded bulb on a lower end or an intermediate portion thereof.
- [3] In methods of constructing a pile foundation, there are a method of driving or embedding a premanufactured concrete pile into the ground, and a method of boring a hole in the ground, and charging grout, such as mortar, concrete, molten glass and asphalt, into the hole, thus forming an underground pile.
- the present invention relates to the method of boring a hole in the ground at a construction site and charging grout such as mortar into the hole, thus forming an underground pile.
- a rapidly expanding metal compound means the rapidly expanding metal compound proposed in Korean Patent Laid-open Publication No. 2003-6083 or Korean Patent Laid-open Publication No. 2003-37707.
- Korean Patent Registration Nos. 10-283505 and 10-442551 when high voltage is applied to a conducting wire (a resistor wire), which is embedded in the rapidly expanding metal compound, the conducting wire is rapidly heated and a spark is caused. Thus, the rapidly expanding metal compound is ignited by the spark.
- the inventor of the present invention has conducted many rock fracturing operations in the world using the rapidly expanding metal compounds and the contact-detonating devices therefor.
- the present invention represents a new use for the rapidly expanding metal compound.
- FIGS. 1 through 3 illustrate a typical method of constructing an underground pile.
- a straight hole 3 having a predetermined depth is formed in the ground by boring using an auger 1.
- grout such as mortar, concrete, molten glass, or asphalt
- the underground pile formed through the above method only has a straight shape, the force for supporting a structure constructed thereon is insufficient. Therefore, to avoid the above-mentioned problem, in the conventional art, a method of forming the straight hole until it reaches solid rock or forming many holes is used.
- an object of the present invention is to provide an underground pile constructing method in which an outward expanded bulb can be formed around the pile at a lower end or at an intermediate position, and an underground pile having an expanded bulb constructed by the method.
- Another object of the present invention is to provide a method of constructing an underground pile, which has a relatively superior supporting force, at reduced cost and in a short period.
- Another object of the present invention is to provide an underground pile having an expanded bulb which can exhibit superior supporting force despite having reduced length and diameter compared to a straight pile, thus providing superior ground reinforcing ability despite the use of a reduced number of piles compared to the conventional art.
- the present invention provides a method of constructing an underground pile having an expanded bulb, including: charging liquefied grout into a hole bored in the ground; inserting a rapidly expanding metal compound of metal powder and a metal salt into the grout; and exploding the rapidly expanding metal compound in the grout before the grout is cured, so that a portion of the hole is widened and the grout is charged into the widened portion.
- the rapidly expanding metal compound is contained in an outer casing made of steel, fiber reinforced plastic or polycarbonate, and is inserted into the grout.
- expanded bulbs which protrude outwards can be easily formed on predetermined portions of an underground pile and, simultaneously, the soil around the pile can be hardened. Furthermore, the construction period and construction cost of the underground pile having the expanded bulbs are markedly reduced. As well, the underground pipe having the expanded bulbs according to the present invention can exhibit superior supporting force despite having reduced length and diameter compared to the straight pile. Therefore, the present invention makes it possible to provide superior ground reinforcing ability despite using a reduced number of piles compared to the conventional art.
- FIGS. 1 through 7 are views showing steps of a method of constructing an un- derground pile having expanded bulbs, according to an embodiment of the present invention.
- FIG. 8 is a sectional view of a rapidly expanding metal compound capsule used in the underground pile constructing method according to the present invention. Best Mode for Carrying Out the Invention
- FIGS. 1 through 7 are views showing steps of the method of constructing the underground pile having the expanded bulbs, according to the present invention.
- FIG. 8 is a sectional view of a rapidly expanding metal compound capsule used in the underground pile constructing method of the present invention.
- the rapidly expanding metal compound 101 is a compound in which metal powder and a metal salt, which oxidizes the metal powder at a high temperature using its own oxygen atoms, are mixed at a weight ratio of 0.1:99.9 to 99.9:0.1. It is preferable that the metal salt be one selected from among a metal nitrate, a metal perchlorate, a metal peroxide, a metal oxide, a metal oxalate, a metal carbonate and a metal sulfate, or be a compound of at least two of them.
- the metal powder be one selected from among aluminum (Al) powder, sodium (Na) powder, potassium (K) powder, lithium (Li) powder, magnesium (Mg) powder, manganese (Mn) powder, barium (Ba) powder, chromium (Cr) powder and silicon (Si) powder, or be a compound of at least two of them.
- the rapidly expanding metal compound 101 is contained in an inner casing 103, which is made of synthetic resin such as PVC (polyvinyl chloride), and is contained in an outer casing (105, 107a and 107b), which is sealed and is made of steel, fiber reinforced plastic or polycarbonate, thus forming the capsule 100.
- an inner casing 103 which is made of synthetic resin such as PVC (polyvinyl chloride)
- an outer casing (105, 107a and 107b)
- fiber reinforced plastic or polycarbonate thus forming the capsule 100.
- Carbon fiber reinforced plastic and glass fiber reinforced plastic are representative examples of the fiber reinforced plastic used in the present invention.
- the carbon fiber reinforced plastic and the glass fiber reinforced plastic, which are high-strength plastic, and polycarbonate have superior plasticity despite having strength similar to steel. Therefore, the outer casing is preferably made of the above high-strength material rather than steel.
- the outer casing is illustrated in FIG. 8 as comprising an outer casing body 105 having a pipe shape and a pair of outer casing caps 107a and 107b that closes the opposite ends of the outer casing body 105, the structure of the outer casing is not limited to this.
- the outer casing can have any structure as long as it has a pressure resisting and sealing structure.
- a resistor wire 109 which generates a spark for creating an oxidation reaction, is embedded in the rapidly expanding metal compound 101.
- the resistor wire 109 is connected to power supply wires 111, which extend outside the inner casing 103 and the outer casing (107a, 107b) of the capsule 100.
- the power supply wires 111 are connected to a contact-detonation device 113, which generates high instantaneous voltage.
- a contact-detonation device 113 which generates high instantaneous voltage.
- FIG. 1 illustrates a process of boring a hole 3 in the ground 5 using an auger 1.
- FIG. 2 illustrates a process of charging grout 7, such as mortar, concrete, molten glass and asphalt, into the bored hole 3. Although it is schematically shown in FIG. 2, the grout 7 is pumped and charged into the hole 3 through a hose using a pump. This is well known to those skilled in the art.
- grout 7 such as mortar, concrete, molten glass and asphalt
- each rapidly expanding metal compound capsule 100 is connected to each other through the power supply wire 111 and are inserted into the grout 7 to the depth at which expanded bulbs are to be formed, as shown in FIG. 4.
- the outer casing (105, 107a and 107b) of each rapidly expanding metal compound capsule 100 is made of steel, it can be easily inserted into the liquefied grout 7 because it is relatively heavy.
- the outer casing of the rapidly expanding metal compound capsule 100 is made of fiber reinforced plastic or polycarbonate, it is inserted into the grout 7 using a tool, such as a long pole.
- the power supply wire 111 is connected to the contact-detonation device 113 as shown in FIG. 5, and high voltage power (3,000V or more) is applied. Then, the rapidly expanding metal compounds and the capsules 100 containing them explode and expand, so that portions of the ground 5 around the rapidly expanding metal compound capsules 100 are widened and the grout 7 is instantaneously charged into the widened portions, as shown in FIG. 6. In this process, the soil around the widened portions is firmly hardened. In addition, a space corresponding to the volume of grout 7 charged into the widened portions is formed in the upper end of the hole 3.
- the grout 7 is discharged and spattered outside the hole 3 by the explosive pressure.
- a detonator such as an explosive
- the grout 7 is completely prevented from being discharged outside the hole 3 and is reliably charged into the widened portion.
- expanded bulbs which protrude outwards can be easily formed on predetermined portions of an underground pile and, simultaneously, the soil around the pile can be hardened. Furthermore, the construction period and construction cost of the underground pile having the expanded bulbs are markedly reduced. As well, the underground pipe having the expanded bulbs according to the present invention can exhibit superior supporting force despite having reduced length and diameter compared to the straight pile. Therefore, the present invention makes it possible to provide superior ground reinforcing ability despite using a reduced number of piles compared to the conventional art.
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Disclosed herein is a method of constructing an underground pile having an expanded bulb on a lower end or an intermediate portion thereof. In the method of the present invention, liquefied grout is charged into a hole bored in the ground, and a rapidly expanding metal compound of metal powder and a metal salt is inserted into the grout. Thereafter, the rapidly expanding metal compound is exploded in the grout before the grout is cured, so that a portion of the hole is widened and the grout is charged into the widened portion. According to the present invention, the expanded bulb which protrudes outwards can be easily formed at a predetermined position of the underground pile and, simultaneously, the soil around the pile can be hardened. Furthermore, the construction period and construction cost of the pile having the expanded bulbs are markedly reduced. As well, the underground pipe having the expanded bulb according to the present invention can exhibit superior supporting force despite having reduced length and diameter compared to the straight pile. Therefore, the present invention makes it possible to provide superior ground reinforcing ability despite using a reduced number of piles compared to the conventional art.
Description
Description
METHOD OF CONSTRUCTING UNDERGROUND PILE HAVING EXPANDED BULB AND UNDERGROUND PILE
THEREBY
Technical Field
[1] The present invention relates generally to methods of constructing underground piles for reinforcing the ground and, more particularly, to a method of constructing an underground pile having an expanded bulb on a lower end or an intermediate portion thereof. Background Art
[2] As well known to those skilled in the art, when structures, such as buildings, railroad lines, bridges, etc., are constructed on soft ground, pile foundations are widely used to prevent the structures from sinking and to ensure supporting force for the structures.
[3] In methods of constructing a pile foundation, there are a method of driving or embedding a premanufactured concrete pile into the ground, and a method of boring a hole in the ground, and charging grout, such as mortar, concrete, molten glass and asphalt, into the hole, thus forming an underground pile. The present invention relates to the method of boring a hole in the ground at a construction site and charging grout such as mortar into the hole, thus forming an underground pile.
[4] The inventor of the present invention proposed, in Korean Patent Registration No.
10-0213577 and in Korean Patent Laid-open Publication No. 2003-6083, rapidly expanding metal compounds, which comprise metal salt as an oxidizing agent, metal powder that is oxidized by the metal salt and is thus increased in volume by an exothermic reaction due to the oxidation, and a promoter that promotes the oxidation reaction between the metal salt and the metal powder. Here, metal nitrate, metal oxide, metal oxalate, metal carbonate and metal sulfate can be used as the metal salt. Aluminum, manganese, magnesium and metal, which can be used as reducers, are used as the metal powder. Furthermore, the inventor of the present invention proposed, in Korean Patent Laid-open Publication No. 2003-37707, a room temperature an- tioxidized rapidly expanding metal compound, in which oil or inorganic antiseptic is added to a rapidly expanding metal compound including metal salt and metal powder.
[5] In the present invention, a rapidly expanding metal compound means the rapidly expanding metal compound proposed in Korean Patent Laid-open Publication No. 2003-6083 or Korean Patent Laid-open Publication No. 2003-37707.
[6] When the rapidly expanding metal compound is detonated using a high temperature spark or shock heat in a sealed space, a sequence of momentary oxidation-reduction
reactions results, so that superhigh pressure metal and metallic oxide steam is generated, thus rapid expansion occurs. After the rapidly expanding metal compound has been rapidly expanded, when the expansion volume and expansion pressure reach predetermined levels, expansion energy is lost, so that it instantly contracts into a liquid or solid phase of metal or metallic oxide. The reason for this is that, because the coefficient of expansion is relatively small, power thereof is exhibited merely within a relatively small range. Using such characteristics of the rapidly expanding metal compound, a noiseless, vibrationless and spatterless rock fracturing operation can be conducted.
[7] Furthermore, the inventor of the present invention developed a method and device for contact-detonating a rapidly expanding metal compound, which were registered in Korean Patent Registration Nos. 10-283505 and 10-442551. In Korean Patent Registration Nos. 10-283505 and 10-442551, when high voltage is applied to a conducting wire (a resistor wire), which is embedded in the rapidly expanding metal compound, the conducting wire is rapidly heated and a spark is caused. Thus, the rapidly expanding metal compound is ignited by the spark.
[8] The inventor of the present invention has conducted many rock fracturing operations in the world using the rapidly expanding metal compounds and the contact-detonating devices therefor. The present invention represents a new use for the rapidly expanding metal compound.
[9] FIGS. 1 through 3 illustrate a typical method of constructing an underground pile. In the conventional underground pile constructing method, a straight hole 3 having a predetermined depth is formed in the ground by boring using an auger 1. Thereafter, grout, such as mortar, concrete, molten glass, or asphalt, is charged into the straight hole 3 using a hydraulic pump or the like and is cured, thus forming an underground pile. However, because the underground pile formed through the above method only has a straight shape, the force for supporting a structure constructed thereon is insufficient. Therefore, to avoid the above-mentioned problem, in the conventional art, a method of forming the straight hole until it reaches solid rock or forming many holes is used. However, as such, if the depth of the hole or the number of holes is increased, the amount of grout to be charged into the holes is also increased. This is very uneconomical. Furthermore, the operation of boring the straight hole 3 using the auger 1 merely forms a hole in the ground without hardening the soil around the hole. Therefore, there is a disadvantage in that, even after the underground pile is constructed, the ground around the underground pile is still soft.
Disclosure of Invention Technical Problem
[10] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide an underground pile constructing method in which an outward expanded bulb can be formed around the pile at a lower end or at an intermediate position, and an underground pile having an expanded bulb constructed by the method.
[11] Another object of the present invention is to provide a method of constructing an underground pile, which has a relatively superior supporting force, at reduced cost and in a short period.
[12] Another object of the present invention is to provide an underground pile having an expanded bulb which can exhibit superior supporting force despite having reduced length and diameter compared to a straight pile, thus providing superior ground reinforcing ability despite the use of a reduced number of piles compared to the conventional art. Technical Solution
[13] In order to accomplish the above object, the present invention provides a method of constructing an underground pile having an expanded bulb, including: charging liquefied grout into a hole bored in the ground; inserting a rapidly expanding metal compound of metal powder and a metal salt into the grout; and exploding the rapidly expanding metal compound in the grout before the grout is cured, so that a portion of the hole is widened and the grout is charged into the widened portion.
[14] Preferably, the rapidly expanding metal compound is contained in an outer casing made of steel, fiber reinforced plastic or polycarbonate, and is inserted into the grout.
Advantageous Effects
[15] According to the present invention, expanded bulbs which protrude outwards can be easily formed on predetermined portions of an underground pile and, simultaneously, the soil around the pile can be hardened. Furthermore, the construction period and construction cost of the underground pile having the expanded bulbs are markedly reduced. As well, the underground pipe having the expanded bulbs according to the present invention can exhibit superior supporting force despite having reduced length and diameter compared to the straight pile. Therefore, the present invention makes it possible to provide superior ground reinforcing ability despite using a reduced number of piles compared to the conventional art. Brief Description of the Drawings
[16] The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
[17] FIGS. 1 through 7 are views showing steps of a method of constructing an un-
derground pile having expanded bulbs, according to an embodiment of the present invention; and
[18] FIG. 8 is a sectional view of a rapidly expanding metal compound capsule used in the underground pile constructing method according to the present invention. Best Mode for Carrying Out the Invention
[19] Hereinafter, a method of constructing an underground pile having expanded bulbs according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.
[20] FIGS. 1 through 7 are views showing steps of the method of constructing the underground pile having the expanded bulbs, according to the present invention. FIG. 8 is a sectional view of a rapidly expanding metal compound capsule used in the underground pile constructing method of the present invention.
[21] First, a rapidly expanding metal compound 101 used in the present invention and the capsule 100 containing the rapidly expanding metal compound 101 therein will be explained herein below.
[22] The rapidly expanding metal compound 101 is a compound in which metal powder and a metal salt, which oxidizes the metal powder at a high temperature using its own oxygen atoms, are mixed at a weight ratio of 0.1:99.9 to 99.9:0.1. It is preferable that the metal salt be one selected from among a metal nitrate, a metal perchlorate, a metal peroxide, a metal oxide, a metal oxalate, a metal carbonate and a metal sulfate, or be a compound of at least two of them. Furthermore, it is preferable that the metal powder be one selected from among aluminum (Al) powder, sodium (Na) powder, potassium (K) powder, lithium (Li) powder, magnesium (Mg) powder, manganese (Mn) powder, barium (Ba) powder, chromium (Cr) powder and silicon (Si) powder, or be a compound of at least two of them.
[23] The rapidly expanding metal compound 101 is contained in an inner casing 103, which is made of synthetic resin such as PVC (polyvinyl chloride), and is contained in an outer casing (105, 107a and 107b), which is sealed and is made of steel, fiber reinforced plastic or polycarbonate, thus forming the capsule 100. Carbon fiber reinforced plastic and glass fiber reinforced plastic are representative examples of the fiber reinforced plastic used in the present invention. Furthermore, the carbon fiber reinforced plastic and the glass fiber reinforced plastic, which are high-strength plastic, and polycarbonate have superior plasticity despite having strength similar to steel. Therefore, the outer casing is preferably made of the above high-strength material rather than steel. Furthermore, for oxidation-reduction reaction of the rapidly expanding metal compound 101, a high oxidation detonating temperature and a sealed space ensuring a predetermined pressure are required. Therefore, the above high-
strength material is preferably used as the material of the outer casing. Although the outer casing is illustrated in FIG. 8 as comprising an outer casing body 105 having a pipe shape and a pair of outer casing caps 107a and 107b that closes the opposite ends of the outer casing body 105, the structure of the outer casing is not limited to this. The outer casing can have any structure as long as it has a pressure resisting and sealing structure.
[24] Meanwhile, a resistor wire 109, which generates a spark for creating an oxidation reaction, is embedded in the rapidly expanding metal compound 101. The resistor wire 109 is connected to power supply wires 111, which extend outside the inner casing 103 and the outer casing (107a, 107b) of the capsule 100. The power supply wires 111 are connected to a contact-detonation device 113, which generates high instantaneous voltage. When high voltage is applied to the resistor wire 109 by the contact- detonation device 113, heat is supplied, and the resistor wire 109 fuses, thus inducing a high current discharge. Then, a spark is generated by the high current discharge, thereby the rapidly expanding metal compound 101 explodes.
[25] Hereinafter, the method of constructing the underground pile having expanded bulbs using the rapidly expanding metal compound capsule 100 having the above-mentioned construction and operation will be explained with reference to FIGS. 1 through 7.
[26] FIG. 1 illustrates a process of boring a hole 3 in the ground 5 using an auger 1. FIG.
2 illustrates a process of charging grout 7, such as mortar, concrete, molten glass and asphalt, into the bored hole 3. Although it is schematically shown in FIG. 2, the grout 7 is pumped and charged into the hole 3 through a hose using a pump. This is well known to those skilled in the art.
[27] As shown in FIG. 3, after the grout 7 has been charged into the hole 3 until it is level with the surface of the ground, a desired number of rapidly expanding metal compound capsules 100 are connected to each other through the power supply wire 111 and are inserted into the grout 7 to the depth at which expanded bulbs are to be formed, as shown in FIG. 4. Here, in the case where the outer casing (105, 107a and 107b) of each rapidly expanding metal compound capsule 100 is made of steel, it can be easily inserted into the liquefied grout 7 because it is relatively heavy. However, in the case where the outer casing of the rapidly expanding metal compound capsule 100 is made of fiber reinforced plastic or polycarbonate, it is inserted into the grout 7 using a tool, such as a long pole. When it is desired to form two or more expanded bulbs in the pile at different heights, a corresponding number of the rapidly expanding metal compound capsules 100 is inserted into the grout 7 such that they are disposed at the desired heights.
[28] After the process of inserting the rapidly expanding metal compound capsules 100 into the grout 7 has been completed, the power supply wire 111 is connected to the
contact-detonation device 113 as shown in FIG. 5, and high voltage power (3,000V or more) is applied. Then, the rapidly expanding metal compounds and the capsules 100 containing them explode and expand, so that portions of the ground 5 around the rapidly expanding metal compound capsules 100 are widened and the grout 7 is instantaneously charged into the widened portions, as shown in FIG. 6. In this process, the soil around the widened portions is firmly hardened. In addition, a space corresponding to the volume of grout 7 charged into the widened portions is formed in the upper end of the hole 3. Here, if a detonator such as an explosive is used, the grout 7 is discharged and spattered outside the hole 3 by the explosive pressure. However, in the case where the rapidly expanding metal compound 101 according to the present invention is used, because the rapidly expanding metal compound 101 contracts just after being rapidly expanded to a predetermined volume, the grout 7 is completely prevented from being discharged outside the hole 3 and is reliably charged into the widened portion.
[29] Thereafter, as shown in FIG. 6 and FIG. 7, additional grout is charged into the space formed in the upper end of the hole 3, and the grout is subsequently cured, thus forming an underground pile 9 having the expanded bulbs 11 at predetermined positions, for example, at the lower end or an intermediate position of the pile 9. Industrial Applicability
[30] As described above, according to the present invention, expanded bulbs which protrude outwards can be easily formed on predetermined portions of an underground pile and, simultaneously, the soil around the pile can be hardened. Furthermore, the construction period and construction cost of the underground pile having the expanded bulbs are markedly reduced. As well, the underground pipe having the expanded bulbs according to the present invention can exhibit superior supporting force despite having reduced length and diameter compared to the straight pile. Therefore, the present invention makes it possible to provide superior ground reinforcing ability despite using a reduced number of piles compared to the conventional art.
Claims
[1] A method of constructing an underground pile having an expanded bulb, comprising: charging liquefied grout into a hole bored in ground; inserting a rapidly expanding metal compound of metal powder and a metal salt into the grout; and exploding the rapidly expanding metal compound in the grout before the grout cures, so that a portion of the hole is widened and the grout is charged into the widened portion.
[2] The method as set forth in claim 1, wherein the rapidly expanding metal compound is contained in an outer casing made of steel, fiber reinforced plastic or polycarbonate and is inserted into the grout.
[3] The method as set forth in claim 1, wherein the rapidly expanding metal compound comprises a compound in which the metal powder and the metal salt that oxidizes the metal powder at a high temperature using oxygen atoms thereof are mixed in a weight ratio of 0.1:99.9 to 99.9:0.1.
[4] The method as set forth in claim 1, wherein the metal salt is one selected from among a metal nitrate, a metal perchlorate, a metal peroxide, a metal oxide, a metal oxalate, a metal carbonate and a metal sulfate, or is a compound of at least two thereof.
[5] The method as set forth in claim 1, wherein the metal powder is one selected among aluminum (Al) powder, sodium (Na) powder, potassium (K) powder, lithium (Li) powder, magnesium (Mg) powder, manganese (Mn) powder, barium (Ba) powder, chromium (Cr) powder and silicon (Si) powder, or is a compound of at least two thereof.
[6] An underground pile having an exploded bulb constructed by the method according to any one of claims 1 through 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060053322A KR100833901B1 (en) | 2006-06-14 | 2006-06-14 | Method of carrying out underground pile with expanded bulbs and pile with expanded bulbs thereof |
| KR10-2006-0053322 | 2006-06-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007145468A1 true WO2007145468A1 (en) | 2007-12-21 |
Family
ID=38831939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2007/002861 WO2007145468A1 (en) | 2006-06-14 | 2007-06-14 | Method of constructing underground pile having expanded bulb and underground pile thereby |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20070292215A1 (en) |
| KR (1) | KR100833901B1 (en) |
| WO (1) | WO2007145468A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845819A (en) * | 2010-05-25 | 2010-09-29 | 武汉大学 | Method for solidifying support of deep and thick soil side slope |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9181674B2 (en) | 2011-06-27 | 2015-11-10 | Hubbell Incorporated | Seismic restraint helical pile systems and method and apparatus for forming same |
| CN103290837B (en) * | 2013-06-06 | 2015-08-26 | 金陵科技学院 | The construction method of explosive expansion castinplace pile and exhaust plant thereof |
| US20150284926A1 (en) * | 2014-04-03 | 2015-10-08 | David Y. Du | Explosive pile device for increasing pile capacity |
| KR101674102B1 (en) * | 2014-10-01 | 2016-11-08 | 삼성물산 주식회사 | Grouting capsule using explsion and grouting method using the same |
| CN105297705A (en) * | 2015-10-14 | 2016-02-03 | 内蒙古工业大学 | Biological sandstone preparation method and device based on MICP (Microbial Induced Carbonate Precipitation) technology |
| KR101850782B1 (en) | 2017-06-08 | 2018-05-30 | (주)대한건설이엔지 | Ground subsidence restoration equipment, and reclamation method of ground subsidence using the same |
| US10577767B2 (en) * | 2018-02-20 | 2020-03-03 | Petram Technologies, Inc. | In-situ piling and anchor shaping using plasma blasting |
| US10844702B2 (en) * | 2018-03-20 | 2020-11-24 | Petram Technologies, Inc. | Precision utility mapping and excavating using plasma blasting |
| CN109137896A (en) * | 2018-09-13 | 2019-01-04 | 荆州市华升新型材料股份有限公司 | A kind of construction method of base expanding and base expanding self-expanding stake |
| CN109958120A (en) * | 2019-04-10 | 2019-07-02 | 国网新疆电力有限公司经济技术研究院 | Method of the cold anti-salt of drought-hit area salinized soil every salt |
| US11536124B2 (en) | 2020-09-03 | 2022-12-27 | Petram Technologies, Inc. | Sliced and elliptical head probe for plasma blast applications |
| US11203400B1 (en) | 2021-06-17 | 2021-12-21 | General Technologies Corp. | Support system having shaped pile-anchor foundations and a method of forming same |
| CN114319331B (en) * | 2022-03-08 | 2022-06-21 | 中国长江三峡集团有限公司 | Construction method of underwater pipe pile type foundation and underwater pipe pile type foundation |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5498011A (en) * | 1978-01-18 | 1979-08-02 | Chiyuuwa Kensetsu Kougiyou Kk | Method of hardening soft weak ground by hardening agent and blasting |
| US4230425A (en) * | 1979-03-19 | 1980-10-28 | Gusev Vladimir A | Method and installation for producing cast-in-situ piles |
| KR20020085638A (en) * | 2001-05-09 | 2002-11-16 | 남동희 | An expanding agent, a self-stressing cement mixed with an expanding agent, and a method for allowing self-stress to cement |
| KR20030006083A (en) * | 2001-07-11 | 2003-01-23 | 김창선 | The rapid expanding metallic compound |
| KR100442551B1 (en) * | 2001-10-23 | 2004-07-30 | 김창선 | Contact-detonating device of rapidly explosive compound material |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1461451A (en) * | 1921-06-07 | 1923-07-10 | Ignatius V Mcglone | Method of making concrete piles |
| JPS5056008A (en) | 1973-09-17 | 1975-05-16 | ||
| JP2859270B2 (en) * | 1987-06-11 | 1999-02-17 | 旭光学工業株式会社 | Camera gaze direction detection device |
-
2006
- 2006-06-14 KR KR1020060053322A patent/KR100833901B1/en not_active IP Right Cessation
-
2007
- 2007-06-12 US US11/808,757 patent/US20070292215A1/en not_active Abandoned
- 2007-06-14 WO PCT/KR2007/002861 patent/WO2007145468A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5498011A (en) * | 1978-01-18 | 1979-08-02 | Chiyuuwa Kensetsu Kougiyou Kk | Method of hardening soft weak ground by hardening agent and blasting |
| US4230425A (en) * | 1979-03-19 | 1980-10-28 | Gusev Vladimir A | Method and installation for producing cast-in-situ piles |
| KR20020085638A (en) * | 2001-05-09 | 2002-11-16 | 남동희 | An expanding agent, a self-stressing cement mixed with an expanding agent, and a method for allowing self-stress to cement |
| KR20030006083A (en) * | 2001-07-11 | 2003-01-23 | 김창선 | The rapid expanding metallic compound |
| KR100442551B1 (en) * | 2001-10-23 | 2004-07-30 | 김창선 | Contact-detonating device of rapidly explosive compound material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845819A (en) * | 2010-05-25 | 2010-09-29 | 武汉大学 | Method for solidifying support of deep and thick soil side slope |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20070119130A (en) | 2007-12-20 |
| US20070292215A1 (en) | 2007-12-20 |
| KR100833901B1 (en) | 2008-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20070292215A1 (en) | Method of constructing underground pile having expanded bulb and underground pile having expanded bulb constructed by the method | |
| US5497829A (en) | Expansion foam borehole plug and method | |
| CN107740410B (en) | Full-length prestressed anchorage support device and process capable of combining and expanding internal anchoring body | |
| KR100358780B1 (en) | Tunnel Blasting Method for using Air Tube | |
| CN103132514B (en) | Detent type anchor rod | |
| CN107843156A (en) | Gallery（Tunnel）The method of driving enhancing Cut Blasting efficiency | |
| US3688507A (en) | Grouting | |
| CN104819670B (en) | Pre-drilling mesopore shaft excavation blasting method | |
| CN108518225A (en) | Dry ice powder dynamic broken rock device, dry ice powder dynamic broken rock system and dry ice powder dynamic rock breaking method | |
| KR100857890B1 (en) | Method of reinforcing ground | |
| CN108278937A (en) | Disposable fracturing expansion tube and its fracturing method | |
| CN109072685A (en) | Degradation material time delay system and method | |
| CN107829768A (en) | It is a kind of can explosion expand the Large Deformation Support device and technique of anchor structure automatically | |
| JP3792208B2 (en) | Friction pile for soft ground and construction method of friction pile | |
| JP2008520942A (en) | Cartridge structure of metal expansive agent for fracture | |
| CN103132515B (en) | Calabash type anchor rod | |
| KR101290010B1 (en) | Explosion volume inflation type lock bolt and construction method using the same | |
| KR101982610B1 (en) | Underwater bedrock blasting method and device and explosives used therefor | |
| US1106606A (en) | Process of making firm foundations in the ground for piles, tubed shafts, and the like. | |
| KR102054098B1 (en) | Underwater bedrock blasting method and device and explosives used therefor | |
| KR100909238B1 (en) | Anchor Body and Anchor Construction Method | |
| JP3073277B2 (en) | Excavation method for steel tower foundation holes | |
| KR100762301B1 (en) | Bottle of crushering using detonating fuses | |
| KR101223034B1 (en) | Anchor | |
| KR102417586B1 (en) | Method for blasting contour hole of tunnel using paper pipe and detonating cord, road slope blasting method and urban bedrock blasting method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07746899 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 07746899 Country of ref document: EP Kind code of ref document: A1 |