WO2009082087A1

WO2009082087A1 - Large diameter pillar construction method by layer-built and frame construction method adapting the same

Info

Publication number: WO2009082087A1
Application number: PCT/KR2008/006277
Authority: WO
Inventors: Ki-Yong Song
Original assignee: Ki-Yong Song
Priority date: 2007-12-21
Filing date: 2008-10-23
Publication date: 2009-07-02

Abstract

The present invention relates to a large diameter pillar construction method wherein a plurality of dry process unit blocks is layer-built to form a single large diameter pillar (e.g., pier, pile, and column). Each of the plurality of unit blocks having a cross section corresponding to the large diameter pillar and a predetermined unit length is made by a precast concrete member, and the plurality of produced unit blocks is introduced to the construction site and is layer-built in such a manner as to be connected to each other, thereby forming one large diameter pillar.

Description

LARGE DIAMETER PILLAR CONSTRUCTION METHOD BY LAYER-BUILT AND FRAME CONSTRUCTION METHOD

ADAPTING THE SAME

Technical Field

[1] The present invention relates to a large diameter pillar construction method wherein a large diameter pier, pile, or column is layer-built with a plurality of unit blocks having a unit length made by a precast concrete member, and to a method for constructing a frame of a structure using the large diameter pillar construction method.

[2]

Background Art

[3] Generally, pillars as a vertical member in a structure serve to finally support load applied to the structure, and they include piles under foundations, piers on bridges, and columns on general buildings.

[4] A method for constructing the pillar is largely classified into dry process construction and wet process construction. According to the dry process construction method, dry process members such as shape steels, steel pipes, PC etc., which are manufactured to one-node unit (a height of generally one to three stories), are introduced to a construction site and are assembled and built. According to the wet process construction method, steel bars are arranged and concrete casting is performed thereon. The two methods are appropriately selected according to various conditions (for example, construction site conditions, construction sizes, construction periods, construction costs, and the like).

[5] In case of a great large-sized structure, a long span-designed structure, or a structure where sufficient reinforcement is needed due to soft ground, a large diameter pillar (e.g., column, pile, pier, etc.) having a diameter in a range from 1000mm to 3000mm is needed. Until now, the construction of the large diameter pillar has been made depending upon the wet process construction method. This is because in the conventional dry process construction method the dry process members are bulky such that it is hard to deliver and lift them. Because of the wet process construction method carried in the construction site, therefore, the conventional large diameter pillar construction method has had some problems in that a quantity of work becomes increased, a construction period is sufficiently needed, and a quality of construction is not ensured positively.

[6]

Disclosure of Invention Technical Problem

[7] Accordingly, the present invention has been made in an effort to solve the above problems occurring in the prior arts, and it is an object of the present invention to provide a large diameter pillar construction method that can solve the problems a wet process construction method carried in a construction site has had, and to provide a method for constructing a frame of a structure wherein the large diameter pillar construction method is adopted for bridge or building construction.

[8]

Technical Solution

[9] To achieve the above object, there are provided a large diameter pillar construction method wherein a plurality of unit blocks is laid up and down to form a large diameter pillar and a method for constructing a frame of a structure using the large diameter pillar construction method, while having the following technical features.

[10] According to the large diameter pillar construction method of the present invention, the plurality of dry process unit blocks is laid up and down to form a single large diameter pillar (e.g., pile, pier, column, and so on). That is, each of the plurality of unit blocks having a cross section corresponding to the large diameter pillar and a predetermined unit length is made by a precast concrete member, and the plurality of produced unit blocks is introduced to the construction site and is layer-built in such a manner as to be connected to each other, thereby forming one large diameter pillar.

[11] The unit length of each unit block is desirably determined upon the delivery and lifting thereof. If the large diameter pillar having a diameter in a range from 1000mm to 3000mm is constructed, the unit block desirably has a height in a range from 50mm to 200mm. Also, the unit block can have a variety of sectional shapes like a round or angled shape according to the shape of the large diameter pillar, and it can be precast with the mixture of the concrete and another materials (e.g., plastic, steel, etc.) as well as with only concrete.

[12] On the other hand, the unit blocks in the preferred embodiment of the present invention are layer-built one by one at a construction position (if a pile is constructed, the construction position becomes a hole pierced on the ground, and if a pier or column is constructed, the construction position becomes the pier or column position). Of course, some unit blocks are layer-built one by one and made by a single construction unit, and after that, the single construction units are layer-built one by one at the construction position.

[13] As described above, according to the large diameter pillar construction method of the present invention, it is possible to construct the large diameter pillar in a dry process, thereby obtaining various effects according to the dry process such as the improvement of workability, the reduction of the construction costs, the decrease of the construction period, and the like.

[14] On the other hand, according to the method for constructing a frame of a structure of the present invention, the plurality of unit blocks is layer-built to construct the large diameter pier or column, and then, beams are constructed on the large diameter pier or column. When the large diameter pier or column is constructed, a unit block made larger than other unit blocks is disposed just below the connection portion of the large diameter pier or column with the beams, and alternatively, a steel bracket instead of the unit block is disposed at the connection portion of the large diameter pier or column with the beams, such that the beams are mounted on the unit block and alternatively, the steel beams are welding or bolt-connected to the steel bracket.

[15]

Brief Description of Drawings

[16] FIG. 1 and FIG. 2 are views showing a large diameter pillar construction method wherein unit blocks are fittingly coupled to each other to form a large diameter pile according to a first embodiment of the present invention.

[17] FIG. 3 and FIG. 4 are views showing a large diameter pillar construction method wherein unit blocks are connected by means of steel wires or steel bars to form a large diameter pile according to a second embodiment of the present invention.

[18] FIG. 5 is a view showing a large diameter pillar construction method wherein unit blocks are connected by means of steel wires or steel bars to form a large diameter pier according to a third embodiment of the present invention.

[19] FIG. 6 is view showing a large diameter pillar construction method wherein unit blocks are connected by means of steel wires or steel bars to form a large diameter column according to a fourth embodiment of the present invention.

[20] FIG. 7 is view showing a construction process wherein the large diameter pillar construction method in FIG.6 is applied to a top-down method.

[21] Explanations on the reference numerals of the main parts in the drawings>

[22] 100, 200: unit block

[23] 110: coupling groove

[24] 120: coupling protrusion

[25] 210: through-hole

[26] 220: steel wire or steel bar

[27] 130,230: lifting loop

[28] 140,240: receiving groove

[29] 250: mounting projection

[30] 300: steel bracket [31] H: ground hole

[32] F: foundation

[33] P1,P2,P3: pile, pier, column

[34] M: non-shrinkage mortar

[35] B: beam

[36] S: slab

[37]

Mode for the Invention

[38] Hereinafter, an explanation on a large diameter pillar construction method according to the preferred embodiments of the present invention will be given with reference to the attached drawings.

[39] FIG. 1 and FIG. 2 show a large diameter pillar construction method according to a first embodiment of the present invention, wherein a plurality of unit blocks 100 is fittingly coupled to each other in a layer-building way to form a large diameter pile Pl.

[40] As shown, each of the unit blocks 100 has a coupling groove 110 or a coupling protrusion 120 on the top and underside surfaces thereof, and as the coupling groove 110 is fitted to the coupling protrusion 120, the unit blocks 100 are layer-built on each other. The fitting coupling of the coupling groove 110 and the coupling protrusion 120 enables the load between the unit blocks 100 to be transmitted, such that the layer-built unit blocks 100 can be constructed on the ground, thereby serving as one large diameter pile Pl supporting the structure thereon.

[41] After the large diameter pile Pl is constructed by layer-building the unit blocks 100, grouting G between the large diameter pile Pl and the pierced ground can be additionally performed, thereby strengthening the skin friction force of the large diameter pile Pl. At this time, as shown in FIG.l(c), if the layer-building of the unit blocks 100 makes the unit blocks 100 have irregular surfaces on the sides thereof, the skin friction force of the large diameter pile Pl can be more improved. The irregular surfaces of the unit blocks 100 on the sides thereof are formed by fittingly coupling the unit blocks 100 having different sectional sizes from each other, and alternatively, they are formed by fittingly coupling the unit blocks 100 having the same sectional sizes in a crossing way to each other. Of course, if the large diameter pile Pl is constructed by layer- building the unit blocks 100, a foundation F is constructed on the large diameter pile Pl.

[42] As shown in FIG. 2, the layer-building of the unit blocks 100 by means of the fitting coupling is preferably carried out at a state where a rubber ring 121 is fitted around the coupling protrusion 120 of the unit block 100. This is aimed to allow the unit blocks 100 to come into close contact with each other and to induce the shock- absorbing effect caused by the rubber ring 121.

[43] Desirably, the unit block 100 has a plurality of lifting loops 130 formed on the top surface thereof, so as to insert crane hooks thereinto, and in this case, the unit block 100 has a plurality of receiving grooves 140 formed on the underside surface thereof, so as to receive the lifting loops 130 correspondingly thereto, thereby enabling the unit blocks 100 to be layer-built on each other at the state of being contacted with each other, without any interference of the lifting loops 130.

[44] FIG. 3 to FIG. 6 are views showing a large diameter pillar construction method according to another embodiments of the present invention, wherein unit blocks 200 are connected by means of steel wires or steel bars 220 jacked and anchored to form one large diameter pile Pl, one large diameter pier P2, and one large diameter column P3.

[45] The unit block 200 has a plurality of through-holes 210 formed to pass through the top and underside surfaces thereof, and by means of the steel wires or steel bars 220 that are inserted into the through-holes 210 in such a manner as to be jacked and anchored, the plurality of unit blocks 200 come into close contact with each other and are layer-built. At this time, after the steel wires or steel bars 220 are anchored, the through-hoes 210 of the unit blocks 200 into which the steel wires or steel bars 220 are inserted are grouted to restrict the movement of the steel wires or steel bars 220 thereinto. Since the unit blocks 200 are tightly connected by means of the contact connection of the steel wires or steel bars 220 to enable the load between the unit blocks 200 to be transmitted, the layer-built unit blocks 200 can be served as one large diameter pillar supporting the structure thereon.

[46] Especially, according to the layer-building of the unit blocks 200 through the contact connection of the steel wires or steel bars 220, the layer-built unit blocks 200 are prestressed by post-tension while the steel wires or steel bars 220 have been jacked and anchored, such that the large diameter pillar can obtain more strengthened compressive force. Of course, the layer-building of the unit blocks 200 through the contact connection of the steel wires or steel bars 220 can be carried out together with that through the fitting coupling thereof. That is, the unit blocks 200 with the through-holes 210 are provided with the coupling groove or protrusion formed on the top and underside surfaces thereof, and they come into close contact with each other by means of the steel wires or steel bars 220, together with the fitting coupling by means of the coupling grooves and protrusions.

[47] The through-holes 210 formed on each unit block 200 so as to insert the steel wires or steel bars 220 thereinto are formed inside each unit block 200, as shown in FIG. 4(a), but they may be formed at the lateral surfaces of each unit block 200, as shown in FIG. 4(b). If the through-holes 210 are formed in such a way as shown in FIG. 4(b), the steel wires and steel bars 220 are guided and inserted from the lateral surfaces of each unit block 200, which makes the connection of the unit blocks 200 carried out more easily. So as to lift the unit block 200 by means of a crane, further, the unit block 200 has a plurality of lifting loops 230 fixed thereon, wherein FIG. 4(a) shows the lifting loops 230 fixed on the top surface of the unit block 200, and FIG. 4(b) shows the lifting loops 230 fixed on the inner periphery of a hollow portion of the hollow type unit block 200. As shown in FIG. 4(a), if the lifting loops 230 are fixed on the top surface of the unit block 200, the unit block 200 should have a plurality of receiving grooves 240 formed on the underside surface thereof so as to receive the lifting loops 230 therein, and as shown in FIG. 4(b), if the lifting loops 230 are fixed on the inner periphery of the hollow portion of the hollow type unit block 200, no separate receiving grooves are needed. In case of using the hollow type unit block 200 as shown in FIG. 4(b), especially, the unit block 200 is light in weight, thereby carrying out the delivery and lifting more easily. In some cases, however, additional processes such as the arrangement of steel bar into the hollow portions of the unit blocks, concrete casting, and grouting can be carried out. In this case, the hollow type unit block serves as a cast for the construction in the construction site, and further, the lifting loops 230 formed on the inner periphery of the hollow portion of the hollow type unit block 200 serve to make the unit block 200 and the concrete or the grouting material formed integrally to each other.

[48] FIG. 3 shows the large diameter pile Pl formed by layer-building the unit blocks

200. In case of constructing the large diameter pile Pl, as shown in FIG. 3(c), grouting G between the large diameter pile Pl and the pierced ground can be additionally performed, thereby strengthening the skin friction force of the large diameter pile Pl. At this time, if the layer-building of the unit blocks 200 are formed to make the unit blocks 200 have irregular surfaces on the sides thereof, the skin friction force of the large diameter pile Pl can be more improved. The irregular surfaces of the unit blocks 200 on the sides thereof are formed by layer-building the unit blocks 200 having different sectional sizes from each other, and alternatively, they are formed by layer- building the unit blocks 200 having the same sectional sizes in a way crossing to each other.

[49] If the unit blocks 200 are layer-built to construct the large diameter pile Pl, a foundation F is built on the large diameter pile Pl. As shown in FIGS. 3(b) and 3(c), if the distal ends of the steel wires or steel bars 220 are anchored by means of an anchor device in such a manner as to be more protruded than the topmost unit block 200, the anchored end portions of the steel wires or bars 200 allow the large diameter pile Pl and the foundation Fl to be formed integrally to each other.

[50] FIG. 5 shows the large diameter pier P2 formed by layer-building the unit blocks 200. Since a beam B and a slab S for connecting the large diameter piers P2 to each other are constructed on the large diameter pier P2, according to the present invention, the unit block 200 disposed just below a connection portion of the large diameter pier P2 with the beam B is formed larger than other unit blocks 200. Since the unit block disposed just below the connection portion of the large diameter pier P2 with the beam B is protruded, a mounting protrusion 250 is naturally provided for mounting the beam B (for example, PC beam, steel beam, half PC beam, and the like), such that the beam B is disposed on the mounting protrusion 250, thereby easily carrying out the construction of the beam B.

[51] Preferably, the casting of the concrete on the construction site is applied to the connection portion of the large diameter pier P2 with the beam B, thereby integrally forming the large diameter pier P2 and the beam B, and at this time, if a connection rod R is connected to the beams B placing the large diameter pier P2 therebetween, stress is gently transmitted to ensure the structural stability. Since the connection rod R is embedded in the concrete cast on the connection portion of the large diameter pier P2 with the beam B, together with the anchored end portions of the steel wires or steel bars 220 at the upper portion of the large diameter pier P2, the formation of the connection rod R allows the large diameter pier P2 and the beam B to be formed integrally to each other. The concrete casting into the connection portion of the large diameter pier P2 with the beam B can be carried out together with the construction of the slab S of the bridge.

[52] FIG. 6 shows the large diameter column P3 formed by layer-building the unit blocks

200. Since the beam B and the slab S are connected on the large diameter column P3, according to the present invention, the unit block 200 disposed just below the connection portion of the large diameter column P3 with the beam B is formed larger than other unit blocks 200, thereby forming the mounting protrusion 250 as shown in FIG. 6(a), and alternatively, a steel bracket 300 instead of the mounting protrusion 250 is disposed on the connection portion of the large diameter column P3 with the beam B, as shown in FIG. 6(b).

[53] FIG. 6(a) shows the example wherein the beams B are fixed to the lateral surfaces of the unit block facing the mounting protrusion 250 of the unit block by means of non- shrinkage mortar M, while adjusting a horizontal level thereof, and FIG. 6(b) shows the example where the steel beams B are bolt-connected (or welding-connected) to the steel bracket 300 of the large diameter column P3. More specifically, as shown in FIG. 6(b), in the structure where the large diameter column and the steel beam are connected, the steel bracket 300 has the same sectional area as the steel beam B, and alternatively, the steel bracket 300 has the different sectional areas from the steel beam B, if it has a shape capable of being connected to the steel beam B. For instance, if an H-shaped steel beam is constructed, the steel bracket 300 has the H-shaped sectional area, such that the steel bracket 300 is connected to both of the flange and the web of the steel beam B. Alternatively, the steel bracket 300 is provided with two plates having the size larger than the unit block in such a manner as to be disposed at the corresponding positions to the upper and lower flanges of the H-shaped steel beam, such that the steel bracket 300 is connected to only the flanges of the steel beam.

[54] On the other hand, as shown in FIG. 6, the unit blocks (including the steel bracket) are layer-built to form the entire building column P3 inclusive of the connection portion with the beam B, and in the same manner as the construction of the pier as shown in FIG. 5, of course, the concrete casting is carried out in the connection portion of the large diameter column P3 with the beam B, thereby integrally forming the large diameter column P3 to the beam B and layer-building only the interlayer portion of the building column P3 with the unit blocks.

[55] FIG. 7 is sectional view showing a construction process where the large diameter column construction method in FIG. 6(a) is applied to a top-down method. The top- down method according to the present invention is almost the same as a general top- down method, except that after an earth retaining wall is constructed, the ground is pierced and the unit blocks 200 are layer-built to construct the large diameter column P3. That is, the earth retaining wall is built, and after the column position is pierced on the ground to form a pierced hole H, the unit blocks 200 are layer-built into the pierced hole H by means of the connection through the steel wires or steel bars 220, thereby completing the large diameter column construction. Next, excavation for the ground between the large diameter column P3 and the adjacent large diameter column P3 is carried out, and then, beams are constructed on the space between the large diameter column P3 and the adjacent large diameter column P3. The excavation and beam construction are repeatedly carried out to construct the frame of the structure in the top- down method.

[56] In the large diameter column construction process, the unit block forming the mounting projection 250 is disposed at the connection portion of the large diameter column with the beam, and alternatively, the steel bracket is disposed instead of the mounting projection 250. So as to make the large diameter column P3 stably anchored on the ground, moreover, the lower portion of the large diameter column P3 is subjected to grouting, thereby forming a pile bulb.

[57] On the other hand, the unit block 200 disposed at the lowermost end of the large diameter column P3 desirably has a relatively larger section than other unit blocks 200, thereby providing a sufficiently high end bearing capacity, and furthermore, so as to strengthen the integral formation between the lowermost story floor finished with a mat foundation and the large diameter column P3, the unit blocks disposed at the connection portion with the mat foundation desirably have different sectional sizes from each other, thereby serving as a wedge (see FIG. 7(f)).

[58] While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.

[59]

[60]

Industrial Applicability

[61] According to the present invention, the large diameter pillar construction method gives the following advantages:

[62] First, the large diameter pile, pier and column are constructed, not in the wet process construction, but in the dry process construction, on the construction site, such that the work on the construction site is simplified, thereby improving the workability and economy.

[63] Second, since a predetermined quality of precast concrete member produced in a factory is used, a construction quality can be constantly ensured, thereby constructing the large diameter pillar having stability in the design strength.

[64] Third, since the layer-built unit blocks are tensionedly connected by means of the steel wires or steel bars, the large diameter pillar as a compression member is constructed, while applying post-tension to a compression direction thereof, thereby easily constructing the large diameter pillar with a more strengthened compressive force.

Claims

[1] A large diameter pillar construction method for constructing a large diameter pile

Pl on the ground, the method comprising the step of: layer-building a plurality of unit blocks 100 having a unit length made by a precast concrete member so as to construct one large diameter pile Pl, wherein each of the unit blocks 100 has a coupling groove 110 or a coupling protrusion 120 on the top and underside surfaces thereof, such that as the coupling groove 110 is fitted to the coupling protrusion 120, each unit block 100 is layer-built on another unit block 100.

[2] The large diameter pillar construction method according to claim 1, wherein each unit block 100 having the coupling protrusion 120 is fittingly coupled to each unit block 100 having the coupling groove 110, while having a rubber ring 121 fitted around the coupling protrusion 120 thereof.

[3] A large diameter pillar construction method for constructing a large diameter pile

Pl, a large diameter pier P2, or a large diameter column P3, the method comprising the step of: layer-building a plurality of unit blocks 200 having a unit length made by a precast concrete member so as to construct one large diameter pillar, wherein each of the unit blocks 200 has a plurality of through-holes 210 formed to pass through the top and underside surfaces thereof, such that by means of a plurality of steel wires or steel bars 220 inserted correspondingly into the through-holes 210 in such a manner as to be jacked and anchored, the plurality of unit blocks 200 comes into close contact with each other and is layer- built.

[4] The large diameter pillar construction method according to claim 1, wherein the through-holes 210 of each unit block 200 are formed at the lateral surfaces of each unit block 200 in such a manner as to communicate with the through-holes 210 formed on another unit block 200, and the steel wires and steel bars 220 are guided and inserted from the lateral surfaces of each unit block 200.

[5] The large diameter pillar construction method according to claim 3 or 4, wherein each of the unit blocks 200 has a coupling groove or a coupling protrusion on the top and underside surfaces thereof, such that as the coupling groove is fitted to the coupling protrusion, each unit block 200 is layer-built on another unit block 200.

[6] The large diameter pillar construction method according to claim 3 or 4, wherein each of the unit blocks 200 is a hollow type member having a hollow portion formed at the center thereof and has a plurality of lifting loops 230 fixedly formed on the inner periphery of the hollow portion so as to insert crane hooks thereinto.

[7] The large diameter pillar construction method according to claim 6, wherein the unit blocks 200 are layer-built and connected with each other by means of the steel wires or steel bars 220, and after a steel bar arrangment concrete casting is carried out or grouting is carried out in the center portions of the unit blocks 200.

[8] The large diameter pillar construction method according to any one of claims 1 to 4, wherein the unit blocks 200 are layer-built to form irregular surfaces on the sides of the unit blocks 200, and after the irregular surfaces on the sides of the unit blocks 200 are formed, grouting G is carried out around the outer peripheries of the unit blocks 200.

[9] A method for constructing a frame of a structure using the large diameter pillar construction method as defined in claim 3, the method comprising the steps of: constructing the large diameter pier P2 or the large diameter column P3 through the large diameter pillar construction method as defined in claim 3; and connecting a beam B with the large diameter pier P2 or the large diameter column P3, wherein in the pier or column construction step, the unit block disposed just below the connection portion of the large diameter pier P2 or the large diameter column P3 with the beam B is formed larger than other unit blocks, thereby providing a mounting protrusion 250 to the connection portion of the large diameter pier P2 or the large diameter column P3 with the beam B, and in the beam connection step, the beam B is mounted on the mounting protrusion 250.

[10] A method for constructing a frame of a structure using the large diameter pillar construction method as defined in claim 3, the method comprising the steps of: constructing the large diameter pier P2 or the large diameter column P3 through the large diameter pillar construction method as defined in claim 3; and connecting a steel beam B with the large diameter pier P2 or the large diameter column P3, wherein in the pier or column construction step, a steel bracket 300 instead of the unit block is disposed just the connection portion of the large diameter pier P2 or the large diameter column P3 with the steel beam B, and in the steel beam connection step, the steel beam B is welding or bolt-connected to the steel bracket 300.

[11] The method for constructing a frame of a structure according to claim 9 or 10, further comprising the step of constructing a slab S after the beam construction, wherein concrete is cast on the large diameter pier P2 or the large diameter column P3 and the beam B, thereby constructing the slab S thereon, and wherein in the slab construction step, the anchored end portions of the steel wires or bars 220 connecting the unit blocks during the pier or column construction step are embedded in the concrete.

[12] The method for constructing a frame of a structure according to claim 9 or 10, wherein the column construction step comprises the steps of constructing an earth retaining wall, piercing the ground, and constructing the large diameter column P3, and after the column construction step, excavation on the ground between the large diameter column P3 and the adjacent large diameter column P3 and beam construction on the space between the large diameter column P3 and the adjacent large diameter column P3 are carried out, the excavation and beam construction being repeatedly carried out to construct the frame of the structure in a top-down method.