KR100932468B1 - Centrifugal precast concrete pile having hollow and construction method using the same, concrete and steel beam - Google Patents

Abstract

PURPOSE: A centrifugal molded hollow precast concrete column construction method using a cast-in-place concrete or a steel column is provided to reduce period, and enhance profitability by excluding a SRC column work. CONSTITUTION: A centrifugal molded hollow precast concrete column comprises a centrifugal molded concrete pile(11) in which a hollow(10a) is formed and a steel band(12) fixed in order to cover a part or the outer surface of a concrete pile. A centrifugal molded hollow precast concrete column construction method using a cast-in-place concrete or a steel column is as follows. An earth retaining wall is constructed along boundaries in which an underground structure is built, and an excavation hole is formed by excavating a surface of column location. The centrifugal molded hollow precast concrete column is inserted in the excavation hole, and the bottom part is fixed by the cast-in-place concrete. The earth retaining wall, the centrifugal molded concrete pile, and the steel band are exposed by excavating. A beam is connected to the steel band. A slab form is installed on the beam and a concrete is placed.

Description

Centrifugal precast concrete pile having hollow and construction method using the same, concrete and steel beam}

The present invention relates to a building construction method, and more specifically, using a precast centrifugal hollow PC (Precast Concrete) column itself prefabricated in a factory as a pillar of the building structure or high-strength concrete inside the centrifugal hollow PC pillar To build a column by inserting a steel pole or inserting a steel column, connecting a steel beam or composite beam to it, or placing a slab on-site, thereby reducing the size and weight of the steel column according to the existing construction method and installing reinforcing bar reinforcement and formwork. The present invention relates to a construction method that can eliminate the complexity of steel reinforced concrete (SRC) column construction.

The invention also relates to centrifugal hollow PC columns used in such construction methods.

In the construction of underground structures according to the conventional top-down method, first, a position to be a pillar of a building is excavated, and then a steel column is inserted and then fixed in place.

Then, when the excavated gap is filled with sand or other soil, and the trench is exposed, the steel pillars are exposed to connect the beam to it.

The slab is then constructed by placing a slab reinforcement and formwork such as, for example, a deck plate, and placing concrete on the beam.

By the way, in the steel column pillar method as described above, because the load of the construction must bear all of the steel pillars alone, it is inevitable to use a steel column with a large size and weight. Therefore, expensive large steel pillars must be used inevitably. In addition, the steel column requires an additional fire-resistant coating is accompanied by an additional process.

According to another conventional construction example, the construction of so-called SRC columns is made by reinforcing steel bars and concrete to support the permanent loads during construction or after the construction is completed, which not only requires complicated processes, It is never desirable in terms of air and economics.

The present invention was devised in view of the above problems, and in the construction of underground construction structures, a centrifugal hollow PC column prefabricated in a factory is used as a pillar of an architectural structure, or a cast-in-place concrete or a small steel column By using the centrifugal hollow PC pillar reinforced with a, it is to provide a structurally stable construction method without the need to use steel pillars having a large size and weight as in the prior art.

Another object of the present invention is to adopt a pre-fabricated centrifugal hollow PC pillar, so that it is not necessary to fireproof the steel pillar as in the prior art, and do not perform the SRC pillar reinforcement of the steel pillar during construction or after completion of construction. By providing a construction method that can shorten the air and increase the economic efficiency.

Still another object of the present invention is to provide a construction method for uniformly distributing the coupling load of the beam by adopting a configuration for connecting and fixing not only the web of the cheolgolbo but also the upper and lower flanges to achieve a structurally stable coupling.

Another object of the present invention, by using the centrifugal hollow PC column with the uneven portion or the support bracket is cast in place of the reinforced concrete beam or flat slab in the field not only excellent workability according to the reinforcement reinforcement but also with the slab structure It is to provide a construction method that can improve the bonding force.

Still another object of the present invention is to provide a centrifugal hollow PC pillar employed in the above construction method.

Building construction method according to an embodiment of the present invention to achieve the above object, (a) to build the earth wall along the boundary to be constructed underground structure, excavating the ground at the position to be a column Forming; (b) inserting a centrifugal hollow concrete pillar having a hollow formed therein and a steel band fixed to surround a portion of an outer circumferential surface of the concrete pile into the excavation hole and fixing a lower end in place with concrete; (c) digging to expose the retaining wall, the centrifugal concrete pile and the steel band; (d) connecting the beam to the steel band; And (e) installing slab formwork on the beam and placing concrete.

Preferably, the step (d), the upper end of the cheolgolbo a pair of flange brackets formed with a coupling end surface is fixed to the upper and lower flanges of the cheolgolbo is joined and the outer surface of the steel band is formed; And attaching to surround the outer circumferential surface of the steel band by being spaced apart by an interval between lower flanges. Attaching a plurality of web brackets to an outer circumferential surface of the steel band between the flange brackets; And a tip end portion of the upper flange and the lower flange of the cheolgolbo coupled to the coupling end surface of the bracket for the flange, the web of the cheolgolbo coupled to the bracket for the web.

According to another embodiment of the present invention, the step (d), a pair of flanges having a coupling end surface is fixed to the upper and lower flanges of the cheolgolbo to be joined and corresponding to the outer surface of the steel band is formed Attaching a bracket for enclosing the outer circumferential surface of the steel band by spaced apart by an interval between the upper and lower flanges of the cheolgolbo; Attaching a plurality of steel brackets comprising an upper flange member, a lower flange member, and a web member interconnecting the protruding steel members to protrude from the outer circumferential surface of the steel band between the flange brackets; And joining the cheolgolbo to the steel bracket.

According to another embodiment of the present invention, a plurality of positioning holes are formed in rows at different heights in the steel band of the centrifugal hollow PC pillar, and the step (d) is the same as the positioning holes. Coupling a cylindrical outer band having a plurality of coupling holes therethrough at intervals to an outer circumferential surface of the steel band; A pair of flange brackets having a coupling end surface to which the upper and lower flanges of the cheolgolbo to be fixed and a curvature corresponding to the outer surface of the steel band are formed are spaced apart by an interval between the upper and lower flanges of the cheolgolbo. Attaching to surround the outer circumferential surface of the outer band; Attaching a plurality of web brackets to an outer circumferential surface of the outer band between the flange brackets; And a tip end portion of the upper flange and the lower flange of the cheolgolbo coupled to the coupling end surface of the bracket for the flange, the web of the cheolgolbo coupled to the bracket for the web.

According to another embodiment of the present invention, the step (d), a pair of coupling end surface is fixed to the upper and lower flanges of the first cheolgolbo to be joined and a curvature corresponding to the outer surface of the steel band is formed Attaching the first flange brackets to be spaced apart by an interval between the upper and lower flanges of the cheolgolbo to surround the outer circumferential surface of the steel band; A gap between the upper and lower flanges of the cheolgolbo, wherein a pair of second flange brackets having a coupling end surface to which the upper and lower flanges of the second cheolgolbo to be fixed are formed and a curvature corresponding to the outer surface of the steel band are formed. Attaching to surround the outer circumferential surface of the steel band at a different height from the bracket for the first flange by being separated by a distance; Attaching a plurality of first web brackets to an outer circumferential surface of the steel band between the first flange brackets; Attaching a plurality of second web brackets to an outer circumferential surface of the steel band between the second flange brackets; Coupling front ends of the upper flange and the lower flange of the first cheolgolbo to the coupling end surface of the bracket for the first flange and simultaneously connecting the web to the bracket for the first web; And a front end portion of the upper flange and the lower flange of the second cheolgolbo is coupled to the coupling end surface of the bracket for the second flange and the web is coupled to the bracket for the second web.

According to another preferred embodiment of the present invention, the method includes: (a) constructing an earthen wall along a boundary on which an underground structure is to be constructed, and digging a ground at a position to be a pillar to form an excavation hole; (b) inserting a centrifugal hollow concrete pillar having a hollow formed therein and a steel band fixed to surround a portion of an outer circumferential surface of the concrete pile into the excavation hole and fixing a lower end in place with concrete; (c) digging to expose the retaining wall, the centrifugal concrete pile and the steel band; (d) attaching a support bracket to surround the outer circumferential surface of the steel band; (e) installing the formwork for building steel concrete beams or flat slabs and simultaneously reinforcing the steel bars so that some ends of the steel bars embedded in the steel concrete beams or flat slabs are coupled to the support brackets; And (f) pouring concrete into the formwork to bury the support brackets.

Preferably, the support bracket includes an upper support bracket and a lower support bracket attached to upper and lower ends of the steel band, respectively, and an upper reinforcing bar is coupled to the upper support bracket among reinforcing bars embedded in the steel concrete beam or flat slab. The lower reinforcing bar is coupled to the lower support bracket.

According to another preferred embodiment of the present invention, the method includes: (a) constructing an earthen wall along a boundary on which an underground structure is to be constructed, and digging a ground at a position to be a pillar to form an excavation hole; (b) excavating the centrifugal hollow PC pillar comprising a hollow formed centrifugal concrete pile, a steel band fixed to surround a portion of the outer circumferential surface of the concrete pile, and a support bracket attached to surround the outer circumferential surface of the steel band. Inserting into the ball and fixing the lower part in place with concrete; (c) exposing the retaining wall, the steel band of the centrifugal concrete pile and the support bracket; (d) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars so that some ends of the steel bars embedded in the steel concrete beam or flat slab are coupled to the support bracket; And (e) placing concrete in the formwork to bury the support bracket.

According to still another preferred embodiment of the present invention, the method includes: (a) constructing an earthquake wall along a boundary where an underground structure is to be constructed, and digging a ground at a position to be a pillar to form an excavation hole; (b) a centrifugal hollow PC pillar including a hollow formed centrifugal concrete pile and an uneven portion integrally formed with concrete so as to protrude from a surface on a portion of an outer circumferential surface of the centrifugal concrete pile, and inserting a lower portion into the excavation hole Fixing with; (c) exposing the uneven portions of the wall and the centrifugal concrete pile by digging; (d) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars embedded in the steel concrete beam or flat slab; And (e) pouring concrete into the formwork to bury the uneven portion.

Preferably, the centrifugal hollow PC pillar further includes a support bracket integrally formed to protrude from the lower portion of the uneven portion.

According to another preferred embodiment of the present invention, the method includes: (a) constructing an earthen wall along a boundary on which an underground structure is to be constructed, and digging a ground at a position to be a pillar to form an excavation hole; (b) inserting a centrifugal hollow PC pillar including a hollow formed centrifugal concrete pile and an uneven portion integrally formed with concrete so as to protrude from the surface over the entire length of the outer circumferential surface of the concrete pile and inserting the lower portion into the concrete Fixing with; (c) exposing the uneven portions of the wall and the centrifugal concrete pile by digging; (d) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars embedded in the steel concrete beam or flat slab; And (e) pouring concrete into the formwork to fill a portion of the uneven portion.

According to another embodiment of the present invention, (a) a hollow formed centrifugal concrete pile, a steel band fixed to surround a portion of the outer peripheral surface of the concrete pile, and a support bracket attached to surround the outer peripheral surface of the steel band Installing a centrifugal hollow PC pillar comprising a location to be a pillar of the building; (b) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the reinforcing bars so that some ends of the steel bars embedded in the steel concrete beam or flat slab are coupled to the support bracket; And (c) placing concrete in the formwork to bury the support bracket.

According to another preferred embodiment of the present invention, (a) a centrifugal hollow PC pillar comprising a hollow formed centrifugal concrete pile and a concave-convex portion integrally formed with concrete so as to protrude from a surface at a portion of an outer circumferential surface of the centrifugal concrete pile Installing at a position to be a pillar of the building; (b) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars embedded in the steel concrete beam or flat slab; And (c) pouring concrete into the formwork to bury the uneven portion.

According to another preferred embodiment of the present invention, (a) a centrifugal hollow PC pillar comprising a hollow formed centrifugal concrete pile and a concave-convex portion integrally formed with concrete to protrude from the surface over the entire length of the outer circumferential surface of the concrete pile Installing at a position to be a pillar of the building; (b) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars embedded in the steel concrete beam or flat slab; And (c) pouring concrete into the formwork so as to fill a portion of the uneven portion.

According to another aspect of the invention, the hollow cylindrical centrifugal molded concrete piles; And a concave-convex portion formed integrally with concrete so as to protrude from a surface at a portion of an outer circumferential surface of the centrifugal concrete pile, and formed at a position corresponding to the reinforced concrete beam or flat slab to be constructed. .

According to another aspect of the invention, the hollow cylindrical centrifugal molded concrete piles; And a concave-convex portion integrally formed with concrete to protrude from the surface over the entire outer circumferential surface of the centrifugal concrete pile.

According to the construction method according to the present invention, since the pre-fabricated centrifugal hollow PC pillar is used as a pillar of a building, or a centrifugal hollow PC pillar reinforced with field-cast concrete or a small steel column is employed, In the same way, it is not necessary to use large, expensive and expensive steel columns to bear all the loads generated during construction.

In addition, according to the building construction method of the present invention, in the process of installing the centrifugal hollow PC pillar used as a pillar, the process of placing concrete or inserting a small steel pillar is performed at the same time, so that the process is simplified and convenient In addition, it is very advantageous in terms of construction period and economics because it is not necessary to perform the SRC pillar work to fire-resistant coating or reinforce the steel pillars.

Nevertheless, in the building construction method of the present invention, by the steel band surrounding the centrifugal concrete pile, the flange bracket and the web bracket, etc., the combined load of the cheolgolbo or composite beam to be bonded is evenly distributed, so that the stable coupling of the beam It is possible.

According to another embodiment of the present invention, by supporting the reinforcement of the reinforced concrete beam or flat slab cast in place on the support bracket, the workability is excellent and convenient, and the support bracket or irregularities are embedded in the concrete structure There is an advantage to improve the bonding force between the and the pillar.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

In the construction method according to the present invention, the centrifugal hollow PC pillar 10 is used as a pillar member of a building, and the configuration of the embodiment of the centrifugal hollow PC pillar 10 is illustrated in FIG. 1.

Referring to the drawings, the centrifugal hollow PC pillar 10 according to an exemplary embodiment of the present invention is a cylindrical centrifugal concrete pile 11 having a hollow 10a and a portion of an outer circumferential surface of the concrete pile 11. It includes a steel band 12 is fixed as if wrapped.

In the embodiment of FIG. 1, an example in which steel bands 12 are provided on top and middle of pillars, respectively, is not limited to this embodiment, and the steel bands 12 may be constructed according to architectural design or necessity. It may be provided with one or a plurality and it should be understood that the position can be selectively adjusted according to the height to which the beam is coupled. In this embodiment, the steel band 12 is also shown on the upper end of the column to explain the construction including the floor slab of the ground floor. Hereinafter, although described with reference to the drawings of the present embodiment, the description can be applied to the pillar having a single steel band 12 as it is of course. Accordingly, the steel band 12 and the peripheral components described in the claims should be construed as one or more of which there is no limit on the number or location.

As another alternative, in FIG. 1, the top surface of the centrifugal concrete pile 11 is configured to be flush with the upper end of the steel band 12, but is not limited thereto. The centrifugal concrete pile 11 is a steel band. It may be formed to protrude further upward than (12). In addition, as will be described later, the upper end of the pillar may be further provided with a member for stack-coupling another pillar on top of it, for this purpose, the end of the pillar can be changed in design to those of ordinary skill in the art.

The centrifugal concrete pile 11 and the steel band 12 are integrally formed in the centrifugal concrete pile manufacturing process, an example of such a manufacturing process is shown in detail in FIG.

As shown, a plurality of the main reinforcing bars 13 in the longitudinal direction inside the steel band 12 made of a cylindrical tube, which are interconnected and supported by spiral wires 14. As another alternative, it is also possible to reinforce the annular loop reinforcement instead of the spiral wire 14.

The steel band 12 and the main reinforcing bar 13 and the spiral wire 14 or the hoop reinforcing bar are assembled on a centrifuge, and then a mold (not shown) is assembled to surround them.

Then, the concrete is put into the mold and the centrifugal table is rotated so that the concrete is biased to the outside of the mold by centrifugal force to form a hollow 10a. The concrete pile 11 densified by steam curing or natural curing of the concrete in which the hollow 10a is formed can be obtained.

According to another preferred embodiment of the present invention, the centrifugal concrete pile 11 may be composed of a double layer of low strength concrete and (ultra) high strength concrete. Specifically, after initially putting a predetermined amount of low-strength concrete into the mold and rotating the centrifuge to form a low-strength concrete layer, and then inserting high-strength concrete into the mold and rotating the centrifuge inside the low-strength concrete layer A high strength concrete layer can be formed. Therefore, a high-strength concrete layer having a hollow is formed inside, and a centrifugal concrete pile having low-strength concrete layers formed on the outside of the high-strength concrete layer can be obtained. In this case, since the low-strength concrete layer surrounds the high-strength concrete layer, the conventional anti-thermal protection measures are unnecessary.

In the present invention, unlike the prior art, the pre-tensioning or partial pre-tensioning process to produce a centrifugal concrete pile, the reason for the coupling load of the beam by the flange bracket and the web bracket as will be described later This can be evenly distributed.

Cured concrete pile 11 and the steel band 12 is preferably configured so that the outer peripheral surface is the same plane, the present invention is not necessarily limited to this configuration, the outer peripheral surface of the steel band 12 is concrete pile It may be configured to protrude by a predetermined thickness from the outer circumferential surface of (11).

As shown in FIG. 3, the centrifugal hollow PC pillar 10 ′ according to another preferred embodiment of the present invention may be a portion to which the steel band 12 is coupled, that is, a cheolgolbo (see 100 of FIG. 11) or a composite. The concrete thickness of the portion to which the beam (see 110 in FIG. 25) is formed is thicker than the rest.

This thick concrete portion 11a may extend to or beyond the interface of the steel band 12, and in the manufacture of the centrifugal concrete pile 11 the mold corresponding to this portion is concave (ie By forming the inner circumferential surface diameter is larger), it is possible to produce a centrifugal concrete pile 11 having a thicker concrete thickness of the bonding site as described above.

When the concrete is formed thick as in this embodiment it is possible to more stably support the load of the combined beam.

According to the present invention, preferably, a plurality of stud bolts (not shown) may be provided on the inner circumferential surface of the steel band 12 to increase the binding force between the steel band 12 and the concrete pile 11. .

The width of the steel band 12 is not particularly limited by the present invention, but preferably, to be set larger than the upper and lower widths of the cheolgolbo 100 or the composite beam 110 to be connected.

According to another preferred embodiment of the present invention, as shown in Figure 4, one or more grooves 15 may be formed on the inner peripheral surface of the hollow (10a) of the centrifugal concrete pile (11). These recesses 15 may be formed in any shape, regular or irregular, continuous or discontinuous.

The groove 15 may be formed in the process of curing the centrifugal concrete pile (11), as will be described later to increase the binding force with the concrete poured in the hollow (10a) to improve the integrity do.

Although not shown in the specific drawings, in order to perform the same function as the groove portion, for example, a shear connecting reinforcing bar (not shown) that is extended to the inside of the hollow 10a while being connected with the main reinforcing bar 13 is employed. Can be.

Then, a method of constructing the underground structure by the top-down method using the centrifugal hollow PC pillar 10 having the above configuration will be described in detail with reference to FIG. 5.

As shown, first, by the design of the building to be built by constructing the retaining wall (1) along the boundary where the underground structure will be constructed. Such a barrier wall (1) serves to prevent the collapse of the surrounding soil in the underground excavation stage, and after completion of the building will function as an underground outer wall of the building.

The mud wall 1 according to the invention can be constructed by various methods already known in the art and is not limited to any particular method.

When the construction of the retaining wall 1 is completed as described above, the ground at the position to be a pillar of the building is subsequently excavated.

Subsequently, when the excavation hole 2 for pillar installation is formed, the centrifugal hollow PC pillar 10 according to the present invention is inserted therein, and the lower end is fixed with the concrete 3 in place.

The lower end of the centrifugal hollow PC pillar 10 can be fixed in a variety of ways, one such example being shown in FIG. 6.

Referring to the drawings, installed in the hollow 10a at the lower end of the centrifugal hollow PC pillar 10 so as to protrude the bottom steel frame 16 for transmitting the column load to the base, and the bottom steel frame 16 and centrifugal The in-place concrete 3 is poured to bury the lower end of the molded hollow PC pillar 10.

Inside the hollow 10a, concrete is poured as described below.

Preferably, a shear connector 17 such as a stud bolt may be further formed to increase the binding force between the bottom steel frame 16 and the concrete.

In addition, reference numeral 18 may be integrally formed at the time of manufacturing the centrifugal concrete pile 11 as a bottom plate coupled to the bottom surface of the centrifugal hollow PC pillar 10.

7 shows a state of fixing the lower end of the centrifugal hollow PCC 10 according to another embodiment of the present invention.

As shown, the lower end of the concrete pile 11 of the centrifugal hollow hollow pillars 10 according to the present embodiment is formed with a protrusion 11b having a larger diameter than the rest of the concrete, which is a structural strength reinforcement and To improve the bonding force.

Therefore, the centrifugal hollow PC pillar 10 may be inserted into the excavation hole 2 and fixed by pouring the in place concrete 3 to bury the lower end portion and the protrusion 11b.

Another method of more firmly fixing the lower end of the centrifugal hollow PC pillar 10 according to the invention is shown in FIGS. 8 and 9.

Referring to the drawings, the bottom of the concrete pile 11 of the centrifugal hollow hollow pillars 10 according to the present embodiment is provided with a lower fixing ring 19 made of a metal material. The lower fixing ring 19 is integrally formed to surround the lower end when manufacturing the centrifugal concrete pile (11).

A PC (Precast Concrete) structure 20 is coupled to a lower portion of the lower fixing ring 19. The PC structure 20 is a pre-fabricated concrete block, and the metal connector 21 is buried so as to protrude from the upper surface. .

Preferably, the metal connector 21 is formed in a cross section corresponding to the cross section of the lower fixing ring 19 is configured to be coupled to both by welding or high-strength bolt, etc., the PC structure 20 The shape of may be variously set to a circle, a square or a polygon.

The centrifugal hollow PC pillar 10 and the PC structure 20 according to the present invention are each manufactured separately in a factory and transported to a site, and then welding or welding the metal connector 21 and the lower fixing ring 19 to each other. Both may be combined by connecting with high-strength bolts.

Thus, by inserting the centrifugal hollow PC pillar 10 into the excavation hole 2 in the state in which the PC structure 20 is coupled, and placing the concrete in place, the pillar 10 is stably fixed as shown in FIG. 9. It can be.

Preferably, the upper part of the lower fixing ring 19 is exposed without being completely embedded in the concrete 3 in place, so that it is embedded in the structure when building the floor slab S or the foundation in a subsequent process. To this end, the outer surface of the lower fixing ring 19 may be further provided with a plurality of shear connector 22 to increase the binding force with the slab concrete.

As described above, when the installation of the centrifugal hollow PC pillar 10 is completed, the primary burr is performed to construct the underground structure. According to a preferred embodiment of the present invention, the centrifugal hollow PC pillar before the primary burrow ( 10) can be reinforced.

The reinforcement of the centrifugal hollow PC pillar 10 is performed by in-casting concrete or inserting a steel pillar such as H-beam into the hollow 10a.

As a first reinforcement method, concrete is poured into the hollow 10a of the installed centrifugal concrete pile 11 and cured. The concrete injected in this way fills the hollow 10a, so the centrifugal hollow PC pillar 10 can serve as a complete PC pillar.

At this time, as described above, in the case where the recessed portion (15 in FIG. 4) is formed on the inner circumferential surface of the hollow 10a of the centrifugal concrete pile 11 or the shear connecting reinforcing bar (not shown) is formed, Can be further improved.

In the second method for reinforcing the centrifugal hollow PC pillar 10 of the present invention, as shown in FIG. 10, a steel column 23 such as an H-beam inside the hollow 10a of the centrifugal concrete pile 11 is shown. Insert

According to the present invention, since the steel column 23 does not support all of the loads generated during construction, but serves to reinforce the centrifugal hollow PC pillar 10, the size and the size compared with the conventional column steel The weight may be remarkably small. That is, the steel pillars 23 need only have a size enough to be inserted into the hollow 10a of the centrifugal concrete pile 11.

In addition, the empty space between the steel pillars 23 and the inner circumferential surface of the hollow 10a is filled with concrete and cured. As a result, since the centrifugal hollow PC pillar 10 is reinforced using steel frame and concrete, the same effect as that of the existing SRC pillar can be obtained. On the other hand, since it is not necessary to perform the SRC process after the fireproof coating or construction of the steel pillars 23, it is also very effective in the construction surface.

As described above, after installing only the centrifugal hollow PC pillar 10 or reinforcing the PC pillar 10 by the cast-in-place concrete or the steel column 23, the underground structure is constructed by the top-down method. .

To this end, as shown in FIG. 11, the primary burst is performed at a predetermined depth. At this time, the depth of the primary trench is made to a suitable degree to build the first floor slab underground.

The soil wall 1 and the centrifugal hollow PC pillar 10 are exposed by the first blowout process. Preferably, after the trench is inspected whether the concrete 10 is properly filled in the hollow 10a of the centrifugal hollow PC pillar 10, and if necessary, a grouting process is performed. Here, the grouting process refers to filling the concrete additionally through holes or gaps.

To this end, it is preferable to form a grouting hole (not shown) that penetrates the steel band 12 and the concrete pile 11 in advance. Therefore, when the grouting hole is exposed after digging, it is checked whether the concrete is uniformly filled in the hollow 10a inside the concrete pile 11 through this, and if necessary, the concrete is additionally filled through the grouting hole. .

Then, the cheolgolbo 100 which is a permanent structural member is connected between the retaining wall 1 and the centrifugal hollow PC pillar 10 or between the centrifugal hollow PC pillar 10.

In the present specification, the process of connecting the cheolgolbo 100 to build the floor slab of the ground layer, but not limited to this, the floor slab of the ground layer may be constructed by conventional conventional methods. In this case, the construction process for the floor slab layer will be applied to the lower layer below the first floor below.

One end of the cheolgolbo 100 may be coupled to the exposed mud wall (1) by a conventional method. Hereinafter, the process of connecting the other end part of the cheolgolbo 100 to the centrifugal hollow PC pillar 10 will be mainly described.

As described above, when the upper portion of the centrifugal concrete pile 11 and the steel band 12 are exposed by performing the primary digging, as shown in FIG. 12, a pair of upper and lower portions of the steel band 12 are exposed. The flange brackets 24a and 24b and the plurality of web brackets 25 are attached. In FIG. 12, for the convenience of illustration, the configuration of both the steel band 12 at the top and the steel band 12 located at the bottom thereof is illustrated, but at this stage, the steel band 12 is positioned at the top of the pillar 10. Reference is made only to the configuration of 12).

According to the present invention, the flange brackets 24a and 24b are attached side by side and spaced apart from each other up and down like surrounding the upper and lower outer peripheral surfaces of the steel band 12. The flange brackets 24a and 24b are each composed of two or more pieces, and each piece has a curvature portion 26 having a curvature corresponding to the outer surface curvature of the steel band 12. . For example, the curvature 26 may be formed in a straight or angular shape when forming an arc or when the concrete pile has a polygonal cross section.

Thus, the curvature 26 can be fixed as shown in FIG. 13 by assembling and welding the pieces together to surround the steel band 12. At this time, the interval between the pair of flange brackets (24a, 24b) is set to be equal to the interval between the upper and lower flanges (see 101 and 103 of Figure 15) of the cheolgolbo 100 is connected as described below do.

The flange brackets 24a and 24b are attached to the steel band 12 to secure the upper and lower flanges 101 and 103 of the cheolgolbo 100. The side surface 27 is configured to be formed.

Preferably, the flange brackets 24a and 24b are formed to have an octagonal shape by cutting corners. In this case, there is an advantage of easy handling during construction and assembly. However, it is to be understood that the shape of the bracket for flange is not necessarily limited thereto and may have various other shapes.

In addition, the upper and lower ends of the steel band 12 may be positioned to protrude further upward and downward than the flange brackets 24a and 24b, but are not necessarily limited thereto.

According to the present invention, by employing the pair of flange brackets 24a and 24b, the load of the beams connected as described below can be evenly distributed to the centrifugal concrete pile.

At the same time, a plurality of web brackets 25 are welded to the outer circumferential surface of the steel band 12 between the pair of flange brackets 24a and 24b. Since the web bracket 102 of the cheolgolbo 100 is coupled to the web bracket 25, the web bracket 25 should be installed in a direction connecting the beams, and preferably may be installed in four directions. have.

A plurality of fastening holes 25a are formed in the web bracket 25 so that the web 102 of the cheolgolbo 100 can be coupled using a high-strength bolt.

According to another preferred embodiment of the present invention, as shown in Fig. 14, in order to connect the centrifugal hollow PC pillar or the conventional column in the longitudinal direction, the connecting plate 28 is placed on the top of the centrifugal hollow PC pillar. Can be installed.

The connecting plate 28 is integrally attached when manufacturing the centrifugal concrete pile 11, wherein the connecting plate 28 may be a buried connection member (not shown) for firm coupling with the concrete. .

For connection, another centrifugal hollow PC column 10 is stacked on the connection plate 28. At this time, the connection plate of the same configuration will be provided at the lower end of the upper centrifugal hollow PC pillar 10 to be stacked. Therefore, mutual coupling may be achieved by welding the connection plates 28 of the centrifugal hollow PC pillars stacked up and down or fastening high-strength bolts to the connection holes 28a. If the conventional steel pillars are stacked, the bottom of the steel pillars may be fixed to the connecting plate by welding or other methods.

After attaching the flange brackets 24a and 24b and the web bracket 25 to the steel band 12 as described above, the cheolgolbo 100 is connected, which is illustrated in FIG. 15.

Specifically, after fixing the plurality of fastening holes formed in the web 102 of the cheolgolbo 100 to match the fastening holes (25a) formed in the bracket for the web (25) fixed by fastening mutually by a high-strength bolt (29) Let's do it.

At the same time, the tip portions of the upper flange 101 and the lower flange 103 of the cheolgolbo 100 is welded in contact with the mating end face 27 of the flange bracket 24a, 24b. According to the design of the building to be constructed, a plurality of cheolgolbo 100 may be connected to the centrifugal hollow PC pillar 10 in the same manner.

According to the building construction method of the present invention, the cheolgolbo 100 is not only the web 102 but also the upper and lower flanges 101, 103 is fixed to the flange bracket 24a, 24b by welding, while the flange Since the brackets 24a and 24b are coupled to surround the steel band 12 of the centrifugal concrete pile 11, the brackets 24a and 24b evenly distribute the combined load of the cheolgolbo 100 through the steel band 12. Make it possible to combine. Therefore, there is no structural problem even if the concrete piles are manufactured without pretensioning or partial pretensioning, and accordingly, the conventional anti-expansion prevention measures may be unnecessary according to the concrete strength used.

Although this embodiment shows only the example in which the cheolgolbo is coupled to the centrifugal hollow hollow pillars, the present invention is not limited to only this embodiment, but the same applies to the so-called steel-concrete composite beam formed by integrally forming steel and concrete It should be understood that it can.

As shown in FIG. 11, when the connecting operation of the cheolgolbo 100 between the centrifugal hollow PC pillar 10 is completed, the slab formwork such as a deck plate (not shown) on the cheolgolbo 100 for slab casting Install and reinforce the slab rebar (not shown).

As is already known, the deck plate is produced by combining the steel plate and the reinforcing bar, and is used as a formwork for constructing a slab, and is used as a permanent member after pouring.

Then, concrete is put on the slab formwork and cured to build a floor slab on the ground floor.

Subsequently, in order to further build the basement layer, as shown in FIG. 16, the second trench is performed so that the bottom of the retaining wall 1 and the centrifugal hollow PC pillar 10 are additionally exposed.

A pair of flange brackets 24a and 24b and a plurality of web brackets 25 are attached to the steel band 12 of the centrifugal hollow PC pillar 10 exposed in the same manner as described above.

In addition, the steel bracket 100 is connected to the flange brackets 24a and 24b and the web bracket 25 in the same manner, and this connection state is illustrated in FIG. 17.

When the connection of the cheolgolbo 100 is completed, by installing the formwork on it and placing concrete to build the first basement slab.

The above process is repeatedly performed to the bottom layer according to the construction design.

According to the present invention, the flange bracket and the web bracket may be modified and applied to various shapes, and examples thereof will be described.

FIG. 18 illustrates a construction example of the centrifugal hollow PC pillar 10 in the construction method according to another preferred embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate the same members.

According to the present embodiment, the web bracket 25 'coupled to the steel band 12 of the centrifugal hollow PC pillar 10 exposed by the underground trench has its front end portions of the flange bracket 24a and 24b. It is configured to lie on the same plane as the mating end face 27 of.

In this case, as shown in Figure 19, when the steel cheolgolbo 100 is coupled to the front end of the lower flange 101, 103 is fixed to the coupling end surface 27 of the flange bracket 24a, 24b for the flange Of course, the tip of the web 102 can also be fixed by welding to the tip of the bracket for the web (25 '). Therefore, cheolgolbo 100 is ensured more robust coupling.

More preferably, the coupling plate 30 may be further reinforced by fastening bolts 29 to the fastening holes 25a formed in the web 102 and the bracket for the web 25 to further reinforce the coupling.

20 and 21 illustrate centrifugal hollow PC pillars 10 constructed in accordance with the building construction method of another preferred embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate members having the same function.

Referring to the drawings, a pair of flange brackets 24a and 24b having the same configuration as described above are attached to the steel band 12 of the centrifugal hollow PC pillar 10 according to the present embodiment.

A plurality of steel brackets 31 are attached to the side of the steel band 12 between the flange brackets 24a and 24b by welding. Here, the steel bracket 31 has a shape corresponding to a portion of the steel cheolgolbo 100 is connected, consisting of an upper flange member 32, a lower flange member 34 and a web member 33 to interconnect them do.

The upper flange member 32 and the lower flange member 34 are respectively welded to the joint end surface 27 of the flange brackets 24a and 24b by welding, and the web member 33 is a steel band 12. On the side of the weld is fixed. To this end, the web member 33 is formed to protrude further inward compared to the upper and lower flange members 32 and 34.

According to this embodiment, it is possible to construct a very simple and quick construction because it is only required to connect the cheolgolbo 100 to the cheolgolbo bracket 31 having the same shape when the cheolgolbo 100 is connected.

22 shows an example of attaching the connecting member to the centrifugal hollow PC pillar 10 according to another preferred embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate members having the same function.

In the centrifugal hollow PCC 10 according to the present embodiment, a plurality of positioning holes 35 are formed in the steel band 12 ′ provided to surround a part of the outer circumferential surface of the concrete pile 11.

The positioning holes 35 are formed in rows at different heights, and threads are formed on an inner circumferential surface thereof. The depth of the positioning hole 35 is not particularly limited and may be formed to the depth of the steel band 12 ′ or extend through the side surface of the concrete pile 11 as shown in FIG. 23.

As described above, the centrifugal hollow PC pillar 10 having the steel band 12 ′ having the positioning hole 35 formed therein is inserted into the excavation hole 2 and the trench is formed so that the top and the steel of the pillar are formed. Allow the band 12 'to be exposed.

Then, a cylindrical outer band 36 is coupled to the outside of the steel band 12 '. The outer band 36 is also divided into pieces using a high-strength metal such as steel, a plurality of coupling holes (36a) on the side at the same interval as the positioning hole 35 formed in the steel band 12 ' It is formed through.

Therefore, the outer band 36 is located on the outside of the steel band 12 ', the appropriate height is set according to the height of the beam to be joined, and then the coupling hole 36a of the outer band 36 and the steel band ( 12 ') in the state in which the positioning hole 35 is aligned to engage the fastening bolts 37 to fix. In addition, the joint between the steel band 12 'and the outer band 36 may be finished by welding.

According to the construction method of this embodiment, even if an error occurs somewhat in the installation position of the centrifugal hollow PC pillar 10, the engagement height of the beam can be set flexibly by adjusting the engagement position of the outer band 36. Furthermore, since the outer band 36 is added to the outside of the steel band 12 ', an effect of further strengthening the strength of the centrifugal hollow PC pillar 10 can also be expected.

When the outer band 36 is coupled as above, as shown in FIG. 24, the flange brackets 24a and 24b are installed to surround the upper and lower outer peripheral surfaces of the outer band 36, and the flange bracket 24a is installed. A bracket 25 for the web is attached between the pads 24b.

According to the building construction method according to the present invention, by combining the dedicated composite beam to the centrifugal hollow PC pillar, its utility can be maximized, the configuration of such a composite beam 110 is shown in FIG.

Referring to the drawings, the composite beam 110 includes a concrete member 111 having a rectangular hexahedral shape, and a tip plate 112 provided at both ends of the concrete member 111.

The concrete member 111 has a length that spans between the pillars of the building to be constructed, it may be formed in various lengths as needed. Inside the concrete member 111, a plurality of tensile rebars are arranged in the longitudinal direction, and a stirrup reinforcement 113 is formed to surround the tensile rebars.

The tip plate 112 is made of a metal material such as steel, preferably, a plurality of stud members (not shown) is formed on one side of the tip plate 112 is embedded at the end of the concrete member 111 The other side is exposed.

In addition, reinforcement plates may be further installed at both ends of the concrete member 111. Specifically, upper and lower reinforcement plates 114 and 115 made of metal are installed on both top and bottom surfaces of the concrete member 111. In this case, the reinforcement of the composite beam is further increased. Preferably, the ends of the upper and lower reinforcement plates 114 and 115 are joined by welding to the sides of the tip plate 112.

More preferably, a plurality of stud bolts are formed on inner surfaces of the upper and lower reinforcing plates 114 and 115 to be embedded in the concrete member 111, thereby increasing the bonding force.

Although not shown in the drawings, as another embodiment, side reinforcement plates may be installed on both side surfaces of the end of the concrete member 111.

According to another preferred embodiment, in order to further reinforce the binding force of the tip plate 112 to the concrete member 111, as shown in Figure 26, the tip plate 112 is at least one buried plate 118 Can be formed. The buried plate 118 extends from one side of the tip plate 112 into the concrete member 111 to further reinforce the bonding force to the concrete member 111.

A plurality of stud bolts are formed in the buried plate 118 to further increase the bonding force with the concrete member 111.

The buried plate 118 not only secures the coupling force between the tip plate 112 and the concrete member 111, but also serves to disperse the stress concentrated on the tip plate 112 to the concrete member 111.

On the other exposed side of the tip plate 112, a bonding plate 116 is formed to connect the composite beam to the centrifugal hollow PC pillar.

The joining plate 116 is formed to have a size smaller than the gap between the pair of flange brackets 24a and 24b provided in the centrifugal hollow PC pillar, preferably the same size as the web bracket 25. Is formed. In addition, the joining plate 116 is provided with a plurality of fastening holes for coupling with the web bracket 25.

Although not shown in the drawings of the present embodiment, the concrete member 111 may be further provided with steel frame. More preferably, such steel frame may be provided while partially embedded in the central portion of the concrete member 111.

According to the preferred construction method of the present invention, a construction process of connecting the composite beam 110 having the configuration shown in FIGS. 25 and 26 to the centrifugal hollow PC pillar 10 is shown in FIGS. 27 and 28. .

As shown, the end of the composite beam 110 is fixed to the centrifugal hollow PC pillar 10, wherein the joining plate 116 is coupled to the bracket for the web 25, at the same time the tip when it is made of steel Plate 112 is the upper and lower outer surface is fixed to the joint end face 27 of the flange bracket (24a, 24b) by welding or high-strength bolt respectively.

The composite beam according to the present embodiment may perform the same function as connecting the cheolgolbo by adopting the tip plate 112 and the bonding plate 116 at both ends of the concrete member 111, thereby ensuring a structural coupling force Can be.

29 shows the assembly configuration of the centrifugal hollow PC pillar constructed in accordance with the building construction method according to another preferred embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate members having the same function.

The centrifugal hollow PC pillar according to the present embodiment has the same configuration as the above-described embodiments except that the cross-sectional shape of the concrete pile 11 is square.

This rectangular concrete pile 11 can be obtained by manufacturing a centrifugal mold into a square. In addition, when the mold is formed into a polygon rather than a rectangle, a concrete pile having a hollow section 10a having a polygonal cross section can be obtained. Hereinafter, the centrifugal concrete pile described in the claims should be interpreted to include a circular, square or polygonal cross section.

According to the present embodiment can be obtained a centrifugal hollow PC pillar having a cross section having a hollow (10a) rectangular or polygonal, and the method of connecting the cheolgolbo 100 or composite beam 110 to the construction here is the same as described above Detailed description will be omitted.

Figure 30 shows the assembly configuration of the centrifugal hollow PC pillar constructed in accordance with the building construction method according to another preferred embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate members having the same function.

Referring to the drawings, a pair of first flange brackets 24-1 and a pair of second flange brackets 24-2 are disposed on the steel band 12 of the centrifugal hollow PC pillar according to the present embodiment. Attach. The second flange bracket 24-2 is attached to a height different from that of the first flange bracket 24-1, so that beams having different heights can be connected.

Further, as described above, the first web bracket 25-1 is provided between the first flange brackets 24-1, and the second web bracket 25-2 is provided between the second flange brackets 24-2. Install the bracket (25-2). At this time, the second web bracket 25-2 is different from the height of the first web bracket 25-1 so that the bonding of the web 102 or the composite beam 110 of the cheolgolbo 100 coupled to different heights It is configured to be coupled with the plate 116. Preferably, the second web bracket (see 25-2 in FIG. 31) is formed longer than the first web bracket 25-1, and may be configured to selectively couple the beams to various heights.

In addition, the second flange bracket 24-2 may not be configured as a pair, but may be configured as a single bracket as shown in FIG. 31.

32 is a state in which the cheolgolbo (100-1) (100-2) is coupled to the different height to the centrifugal hollow PC pillar 10 according to the present embodiment. As can be seen in the drawing, the upper and lower flanges of the first cheolgolbo (100-1) is fixed to the coupling end surface of the bracket for the first flange (24-1), the first web bracket (25-1) 1 Combine the web of cheolgolbo.

In addition, the upper and lower flanges of the second cheolgolbo 100-2 having a different height from the first cheolgolbo 100-1 is fixed to the coupling end surface of the bracket for the second flange 24-2, for the second web The web of the second cheolgolbo (100-2) is coupled to the bracket (25-2).

According to another preferred embodiment of the present invention, centrifugal hollow PC columns can be used to cast reinforced concrete (RC) beams or to construct flat slabs, which are shown in FIG. 33. An example of a hollow PC post is shown. Here, the same reference numerals as in the previously shown drawings indicate members having the same function.

Referring to the drawings, the centrifugal hollow PC pillar 40 according to the present embodiment is fixed to surround a cylindrical centrifugal concrete pile 11 having a hollow 10a and a portion of an outer circumferential surface of the concrete pile 11. And a steel band 12 which is provided.

According to the present invention, one or more support brackets 41 and 42 are coupled to the steel band 12, and the support bracket is a circular plate made of steel, similarly to the flange bracket described above, and is separated into a plurality of parts. Or may be integrally coupled.

In the present embodiment, the support brackets 41 and 42 are coupled to end portions of reinforced concrete (RC) beams or flat slabs embedded in the site, and at the same time in the reinforced concrete beams or flat slabs when concrete is poured. Landfilling increases slab binding and structural reinforcement.

Preferably, the support bracket includes an upper support bracket 41 and a lower support bracket 42 coupled to upper and lower ends of the steel band 12, respectively. However, in the present invention, a pair of support brackets are not necessarily provided, and only the upper support bracket 41 may be provided without the lower support bracket 42.

The upper support bracket 41 and the lower support bracket 42 are preferably formed at positions corresponding to the heights of the upper reinforcing bars (see 51 in FIG. 35) and the lower reinforcing bars (see 52 in FIG. 35) which are disposed in the slab. .

In addition, a plurality of shear connecting members 43 such as stud bolts may be further provided on the outer surface of the steel band 12 to increase the binding force with the slab to be constructed as described below.

More preferably, as shown in FIG. 34, a plurality of vertical stiffeners 44 may be further installed between the pair of upper and lower support brackets 41 and 42 for reinforcement. The vertical stiffeners 44 may be welded at appropriate intervals between the upper and lower support brackets 41 and 42 using conventional iron plates.

Although the drawings show that only one steel band 12 and one support bracket 41 and 42 are provided, each of the plurality of steel bands 12 and the support brackets may correspond to a point where the slab of each basement layer is constructed. 41) 42 may be provided spaced at predetermined intervals. In addition, as in the above-described embodiment, it is also possible to connect two or more centrifugal hollow PC pillars 40 in the longitudinal direction for construction.

The construction method using the centrifugal hollow PC pillar 40 according to the present embodiment is very similar to the above-described embodiment.

Centrifugal PC pillar 40 according to the present embodiment is manufactured integrally in advance in the manufacturing plant and transported to the construction site is installed.

As seen in the above-described embodiment, after constructing the retaining wall (1 in FIG. 5) along the boundary of the building, excavating the ground of the position to be the pillar, the centrifugal hollow PC pillar 40 according to the present embodiment here. ) And insert it.

The method of fixing the lower end of the centrifugal hollow PC pillar 40 may be made in the same manner as described above. In addition, the concrete is injected into the hollow 10a of the centrifugal hollow PC pillar 40 and cured, or a steel column such as an H-beam (see 23 in FIG. 10) is inserted into the hollow 10a and the concrete is removed. You can also reinforce the column by pouring it.

Subsequently, a primary blowout is performed to expose the steel band 12 and the support brackets 41 and 42 of the centrifugal hollow PCC 40 (see FIG. 11). At this time, if necessary, it is possible to check the state of filling whether the concrete 10 is properly filled in the hollow 10a of the centrifugal hollow PC pillar 40 and perform a grouting process.

Although in the present embodiment it is illustrated from the outset using the centrifugal hollow PC pillar 40 to which the support brackets 41 and 42 are pre-attached, similar to the embodiments described above, the steel band 12 Only the centrifugal hollow PC pillar 40 attached thereto is inserted and fixed in an excavation hole, and then exposed by performing an underground trench, and the support brackets 41 and 42 and the vertical stiffener 44 are subsequently welded and joined thereto. You may.

The exposed centrifugal hollow PC pillar 40 exposed as described above connects reinforced concrete (RC) beams by site casting or constructs a flat slab.

To this end, as shown in Figure 35, while installing the formwork 50 for the construction of reinforced concrete beams or flat slabs, the reinforcement to be embedded in the reinforced concrete beams or slabs are reinforced.

Preferably, a part of the reinforcing bar is supported by an end thereof coupled to the support brackets 41 and 42, and more preferably, the upper support bracket 41 is welded to the end of the upper reinforcing bar 51 by welding. Couple to, the end of the lower reinforcing bar 52 to the lower support bracket 42.

Here, the upper reinforcement 51 refers to the reinforcing bar located in the upper portion of the reinforced concrete beam or the reinforcement embedded in the flat slab, the lower reinforcement 52 refers to the reinforcing bar located below. However, it should be understood that the upper and lower reinforcing bars do not necessarily mean the upper or lower reinforcing bars, but are used to set relative positional relations with each other. Therefore, it is obvious that additional reinforcing bars may be disposed above and below these upper and lower reinforcing bars 51 and 52 as necessary.

Alternatively, if only one support bracket is provided (for example, if only the upper support bracket is provided), only the end of the reinforcing bar positioned at the corresponding height will be coupled to the support bracket.

In the present embodiment, the reinforcing bars 51 and 52 have been described as being coupled to the support brackets 41 and 42 by welding, but are not limited thereto and may be coupled using other known methods such as using a coupler. Of course it is possible. As another alternative, the reinforcing bars 51 and 52 may be passed to pass through the column.

As described above, when the reinforcement of the formwork 50 and the reinforcing bar 51, 52 is completed, it is possible to complete the reinforced concrete beam or flat slab by pouring and curing the concrete 53. According to the present embodiment, the support brackets 41 and 42 are completely embedded in the concrete 53 to be poured. Preferably, the concrete 53 is a shear connecting member 43 formed at the side of the steel band 12. ) Strengthens the bonding force.

If reinforced concrete beams are first constructed, the slab may be constructed by installing deck plates on the beams, placing reinforcement bars, and then placing concrete as described above.

Subsequently, in order to further build the basement layer, as shown in FIG. 16, the second trench is performed to further expose the lower portion of the retaining wall 1 and the centrifugal hollow PC pillar 40, and then repeat the same process. .

According to the present embodiment, the concrete 53 is poured while the end of the reinforcement embedded in the reinforced concrete beam or flat slab is coupled to the support brackets 41 and 42 provided in the centrifugal hollow PC pillar 40. Since the support brackets 41 and 42 are completely buried, not only can the reinforcement work be easily performed, but also the structural force can be increased by further increasing the bonding force between the reinforced concrete beam or flat slab and the centrifugal hollow PC pillar 40. .

36, there is shown a schematic configuration of a centrifugal hollow PCC column 60 according to another preferred embodiment of the present invention. Here, the same reference numerals as in the above-described drawings indicate members having the same function.

Referring to the drawings, the centrifugal hollow PC pillar 60 according to the present embodiment has a cylindrical shape centrifugal concrete pile 11 having a hollow 10a and an uneven portion formed on a part of an outer circumferential surface of the concrete pile 11. And (61).

The uneven portion 61 is integrally formed so that a part of the surface of the centrifugal concrete pile 11 is protruded, the position is formed over the range in which the reinforced concrete beam or flat slab is constructed.

The uneven portion 61 may be obtained by providing a groove in the mold, injecting and rotating concrete in the process of forming the centrifugal concrete pile 11.

Preferably, the uneven portion 61 is projected outward from the surface of the centrifugal concrete pile 11, it is characterized in that the cross-sectional area of the pile is not reduced.

Although the cross section of the concave-convex portion 61 shown in the present embodiment has a shape such as a thread or a tooth, it is not limited thereto and may be formed in any shape that is regular or irregular.

According to the present invention, the uneven portion 61 increases the vertical shear resistance of the reinforced concrete beam or flat slab to be constructed, and at the same time serves to improve the bonding force with the concrete.

According to a more preferred embodiment of the present invention, in order to stably support the reinforced concrete beam or flat slab to be built, the support bracket 62 may be further formed on the lower portion of the uneven portion 61, this configuration is shown in FIG. 37 is shown.

As shown in the figure, the support bracket 62 is preferably formed in a circular shape so as to protrude below the uneven portion 61. Preferably, such a support bracket 62 is integrally formed using concrete when manufacturing the centrifugal concrete pile 11.

A variant of a centrifugal hollow PCC column according to another preferred embodiment of the present invention is shown in FIGS. 38 and 39. Here, the same reference numerals as in the above-described drawings indicate members having the same function.

In the centrifugal hollow PC pillar 60 ′ shown in FIG. 38, an uneven portion 61 ′ is formed over the entire length of the outer circumferential surface of the centrifugal concrete pile 11. In this case, it is possible to eliminate the difficulty of forming the uneven portion 61 ′ in accordance with each slab position of the basement floor.

The centrifugal hollow PC column 60 " shown in FIG. 39 supports the support bracket 62 'at the point corresponding to the height at which the reinforced concrete beam or flat slab is formed in the centrifugal concrete pile 11 shown in FIG. ) Is an example.

Then, the method of constructing the underground structure by the top-down method using the centrifugal hollow PC pillar 60 of the embodiment shown in FIG. 36 will be described. Although described with reference to the embodiment of FIG. 36 herein, it is to be understood that the content is equally applicable to the embodiment of FIGS. 37 to 39.

The underground structure construction method using the centrifugal hollow PC pillar 60 according to the present embodiment is also very similar to the above-described embodiments. That is, the process of constructing the retaining wall (refer to 1 in FIG. 5), the process of inserting and installing the centrifugal hollow PC pillar 60 after drilling the excavation hole 2 are performed in the same manner.

Then, by proceeding the primary trench to expose the uneven portion 61 of the centrifugal hollow PC pillar 60, and then, as shown in Figure 40, by connecting the reinforced concrete (RC) beam by site casting or flat slab Construct it.

Specifically, while installing the formwork 65 for constructing the reinforced concrete beam or flat slab, the reinforcement 66 to be embedded in the reinforced concrete beam or slab is reinforced. Such reinforcement 66 may be passed to pass through the pillar.

If the support bracket 62 is further formed below the uneven portion 61, as shown in FIG. 41, the formwork 65 may be installed according to the height of the support bracket 62.

As described above, when the reinforcement of the formwork 65 and the reinforcing bar is completed, the concrete 67 is poured into the formwork 65 and cured, thereby constructing the reinforced concrete beam or flat slab. At this time, the concrete 67 embeds the uneven portion 61 of the centrifugal hollow PC pillar 60, thereby further increasing the coupling force between the pillar and the concrete.

If reinforced concrete beams are constructed first, the slab can be constructed by installing deck plates on the beams, placing reinforcement bars and placing concrete as described above.

Subsequently, in order to further build the basement layer, as shown in FIG. 16, the second trench is performed to further expose the lower portion of the retaining wall 1 and the centrifugal hollow PC pillar 60, and then repeat the same process. To perform.

If the underground structure is constructed using a centrifugal hollow PC pillar 60 'as shown in FIG. 38, and the strength of the pillar is insufficient during the total load action, as shown in FIG. In order to reinforce, it is also possible to reinforce the reinforcing bar 71 in the longitudinal direction to the outer surface of the column 60 'and cover the concrete 72 to form a reinforced concrete composite cross section.

Although only the construction method for constructing the structure of the basement layer by the top-down method has been described in the present specification, the centrifugal hollow PC pillars of the embodiments shown in FIGS. 33 to 39 may be equally applicable to not only the basement but also the ground layer construction. have.

In case of applying them to the ground floor construction, after installing the centrifugal hollow PC pillar having the configuration as described above in the position where the building will be a pillar, the formwork and the reinforcing bars are laid in the same manner as the basement layer, and then reinforced concrete beam or flat It will build the slab. Such a construction method is sufficiently practicable at the level of ordinary skill in the art with reference to the drawings of the above-described embodiments, and thus a detailed description thereof will be omitted.

Although the present invention has been described through limited drawings and embodiments, it should be understood that various modifications may be made by those skilled in the art within the scope of the technical matters described in the claims below.

Although the present invention will be described in detail with reference to the following drawings, these drawings illustrate preferred embodiments of the present invention, and the technical concept of the present invention is not limited to the drawings and should not be interpreted.

1 is a perspective view showing a schematic configuration of a centrifugal hollow PC pillar used in a building construction method according to a preferred embodiment of the present invention.

Figure 2 is a perspective view for explaining the process of manufacturing a centrifugal concrete pile of the centrifugal hollow PC pillar used in the building construction method according to a preferred embodiment of the present invention.

3 is a perspective view showing another example of a centrifugal hollow PC pillar used in a building construction method according to a preferred embodiment of the present invention.

Figure 4 is a cross-sectional view showing another configuration of a centrifugal hollow PC pillar used in the building construction method according to a preferred embodiment of the present invention.

5 is a construction drawing for explaining a building construction method according to a preferred embodiment of the present invention.

Figure 6 is a cross-sectional view showing a configuration for fixing the lower end of the centrifugal hollow PC pillar in the building construction method according to a preferred embodiment of the present invention.

7 is a cross-sectional view showing another method of fixing the lower end of the centrifugal hollow PCC in the building construction method according to a preferred embodiment of the present invention.

8 and 9 are a partial perspective view and a cross-sectional view showing another configuration for fixing the lower end of the centrifugal hollow PC pillar in the construction method according to a preferred embodiment of the present invention.

10 is a perspective view showing a state in which the steel pillar is inserted into the hollow of the centrifugal hollow PC pillar in the building construction method according to a preferred embodiment of the present invention.

FIG. 11 is a view illustrating a process of performing an underground trench and connecting cheolgolbo according to the top-down method in the building construction method according to the preferred embodiment of the present invention.

12 is a perspective view for explaining a process of attaching the flange bracket and the web bracket to the steel band of the centrifugal hollow PC pillar exposed after the underground trench in the building construction method according to a preferred embodiment of the present invention.

13 is a perspective view showing a state in which the flange bracket and the web bracket are attached to the steel band of the centrifugal hollow PC pillar exposed after the underground trench in the building construction method according to a preferred embodiment of the present invention.

14 is a perspective view illustrating another example in which a flange bracket and a web bracket are attached to a steel band of a centrifugal hollow PC pillar in a building construction method according to a preferred embodiment of the present invention.

15 is a partial perspective view showing a state in which the cheolgolbo connected to the centrifugal hollow PC pillar of Figure 14 in the building construction method according to a preferred embodiment of the present invention.

FIG. 16 is a view illustrating a process of performing a second trench and connecting a cheolgolbo according to a tower-down method in a building construction method according to a preferred embodiment of the present invention.

17 is a partial perspective view showing a state in which the cheolgolbo connected to the centrifugal hollow PC pillar exposed after the underground trench in the building construction method according to a preferred embodiment of the present invention.

18 is a perspective view showing a construction state of the centrifugal hollow PC pillar used in the building construction method according to another preferred embodiment of the present invention.

FIG. 19 is a partial perspective view illustrating a construction process of connecting a cheolgolbo by using the configuration of the centrifugal hollow PC pillar illustrated in FIG. 18.

20 is a perspective view showing the configuration of a centrifugal hollow PC pillar constructed by a building construction method according to another preferred embodiment of the present invention.

FIG. 21 is a partial perspective view illustrating a construction process of connecting a cheolgolbo by using the configuration of the centrifugal hollow PC pillar illustrated in FIG. 20.

22 is a perspective view showing the configuration of a centrifugal hollow PC pillar constructed by a building construction method according to another preferred embodiment of the present invention.

FIG. 23 is a cross-sectional view showing still another example of the positioning hole in the centrifugal hollow PC pillar shown in FIG.

24 is a perspective view illustrating a construction process of attaching the flange bracket and the web bracket using the configuration of the centrifugal hollow PC pillar shown in FIG. 22.

25 and 26 are perspective views each showing an example of the configuration of a dedicated composite beam used in the building construction method according to another preferred embodiment of the present invention.

FIG. 27 and FIG. 28 are partial perspective views showing a construction state in which the composite beams shown in FIGS. 25 and 26 are connected to the centrifugal hollow PC pillars, respectively.

29 is a perspective view showing a construction state of the centrifugal hollow PC pillar used in the building construction method according to another preferred embodiment of the present invention.

30 and 31 are perspective views respectively showing the construction state of the centrifugal hollow PC pillar used in the building construction method according to another preferred embodiment of the present invention.

32 is a cross-sectional view showing a state in which the cheolgolbo connected in accordance with the construction state of the centrifugal hollow PC pillar shown in FIG.

33 and 34 are perspective views each showing the configuration of a centrifugal hollow PC pillar used in a building construction method according to another preferred embodiment of the present invention.

FIG. 35 is a cross-sectional view showing the construction construction state using the centrifugal hollow PC pillar shown in FIG. 33.

36 to 39 are perspective views each showing the configuration of the centrifugal hollow PC pillar used in the building construction method according to another preferred embodiment of the present invention.

40 is a cross-sectional view showing the construction construction state using the centrifugal hollow PC pillar shown in FIG.

FIG. 41 is a cross-sectional view showing the construction construction state using the centrifugal hollow PC pillar shown in FIG. 37. FIG.

It is sectional drawing which shows the state which reinforced the exterior of the pillar in the construction method using the centrifugal hollow PC pillar shown in FIG.

Claims (33)

(a) constructing a retaining wall along a boundary where the underground structure is to be constructed, and excavating a ground at a position to be a column to form an excavation hole; (b) A centrifugal hollow PC pillar including a centrifugal concrete pile 11 having a hollow 10a formed therein and a steel band 12 fixed to surround a portion of an outer circumferential surface of the concrete pile is inserted into the excavation hole and has a lower end portion. Fixing the in place concrete; (c) digging to expose the retaining wall, the centrifugal concrete pile and the steel band; (d) connecting the beam to the steel band; And (e) installing the slab formwork on the beam and placing concrete; building construction method comprising a. The method of claim 1, In step (d), A pair of flanges for which the upper and lower flanges 101 and 103 of the cheolgolbo 100 to be coupled are fixed and a curvature portion 26 corresponding to the outer surface of the steel band is formed. Attaching brackets 24a and 24b to surround the outer circumferential surface of the steel band by being spaced apart by an interval between the upper and lower flanges of the cheolgolbo 100; Attaching a plurality of web brackets 25 to the outer circumferential surface of the steel band between the flange brackets; And The front end of the upper flange 101 and the lower flange 103 of the cheolgolbo 100 is coupled to the coupling end surface 27 of the bracket for the flange, the web 102 of the cheolgolbo 100 is the web bracket Building construction method comprising a; step of coupling to. The method of claim 1, In step (d), A pair of flanges for which the upper and lower flanges 101 and 103 of the cheolgolbo 100 to be coupled are fixed and a curvature portion 26 corresponding to the outer surface of the steel band is formed. Attaching brackets 24a and 24b to surround the outer circumferential surface of the steel band by being spaced apart by an interval between the upper and lower flanges of the cheolgolbo 100; Attaching a plurality of steel brackets (31) composed of an upper flange member (32), a lower flange member (34), and a web member (33) interconnecting them to protrude on the outer circumferential surface of the steel band between the flange brackets; And Building method comprising the; cheolgolbo (100) coupled to the steel bracket (31). The method of claim 1, The plurality of positioning holes 35 are formed in rows at different heights in the steel band 12 'of the centrifugal hollow PC pillar, In step (d), Coupling a cylindrical outer band (36) through which a plurality of coupling holes (36a) are formed at the same interval as the positioning hole to an outer circumferential surface of the steel band (12 '); A pair of flanges for which the upper and lower flanges 101 and 103 of the cheolgolbo 100 to be coupled are fixed and a curvature portion 26 corresponding to the outer surface of the steel band is formed. Attaching brackets 24a and 24b to surround the outer circumferential surface of the outer band 36 by being spaced apart by an interval between the upper and lower flanges of the cheolgolbo 100; Attaching a plurality of web brackets (25) to an outer circumferential surface of the outer band (36) between the flange brackets; And The front end of the upper flange 101 and the lower flange 103 of the cheolgolbo 100 is coupled to the coupling end surface 27 of the bracket for the flange, the web 102 of the cheolgolbo 100 is the web bracket Building construction method comprising a; step of coupling to. The method of claim 1, In step (d), As long as the coupling end surface 27 to which the upper and lower flanges 101 and 103 of the first cheolgolbo 100-1 to be coupled are fixed and the curvature portion 26 corresponding to the outer surface of the steel band are formed. Attaching a pair of first flange brackets 24-1 to cover the outer circumferential surface of the steel band by spaced apart by an interval between the upper and lower flanges of the cheolgolbo 100-1; As long as the coupling end surface 27 to which the upper and lower flanges 101 and 103 of the second cheolgolbo 100-2 to be coupled are fixed and the curvature portion 26 corresponding to the outer surface of the steel band are formed. The pair of second flange brackets 24-2 are spaced apart by the gap between the upper and lower flanges of the cheolgolbo 100-2 so as to have a different height than the first flange brackets 24-1. Attaching to surround the outer circumferential surface of the band; Attaching a plurality of first web brackets 25-1 to the outer circumferential surface of the steel band between the first flange brackets 24-1; Attaching a plurality of second web brackets 25-2 to the outer circumferential surface of the steel band between the second flange brackets 24-2; The front end portion of the upper flange 101 and the lower flange 103 of the first cheolgolbo 100-1 is coupled to the coupling end surface 27 of the bracket for the first flange 24-1 and at the same time the web 102 Coupled to the first web bracket (25-1); And The front end of the upper flange 101 and the lower flange 103 of the second cheolgolbo 100-2 is coupled to the coupling end surface 27 of the bracket for the second flange 24-2 and at the same time the web 102 Building construction method comprising a; coupling to the second web bracket (25-2). (a) constructing a retaining wall along a boundary where the underground structure is to be constructed, and excavating a ground at a position to be a column to form an excavation hole; (b) A centrifugal hollow PC pillar including a centrifugal concrete pile 11 having a hollow 10a formed therein and a steel band 12 fixed to surround a portion of an outer circumferential surface of the concrete pile is inserted into the excavation hole and has a lower end portion. Fixing the in place concrete; (c) digging to expose the retaining wall, the centrifugal concrete pile and the steel band; (d) attaching a support bracket 41 to surround the outer circumferential surface of the steel band; (e) installing the formwork for building steel concrete beams or flat slabs and simultaneously reinforcing the steel bars so that some ends of the steel bars embedded in the steel concrete beams or flat slabs are coupled to the support brackets; And and (f) pouring concrete into the formwork to bury the support brackets. The method of claim 6, The support bracket includes an upper support bracket 41 and a lower support bracket 42 attached to upper and lower ends of the steel band, respectively. Among the steel bars embedded in the steel concrete beam or flat slab, the upper reinforcing bar 51 is coupled to the upper support bracket 41, and the lower reinforcing bar 52 is coupled to the lower support bracket 42. Construction method. (a) constructing a retaining wall along a boundary where the underground structure is to be constructed, and excavating a ground at a position to be a column to form an excavation hole; (b) a centrifugal concrete pile 11 having a hollow 10a, a steel band 12 fixed to surround a portion of the outer circumferential surface of the concrete pile, and a support bracket 41 attached to surround the outer circumferential surface of the steel band. Inserting a centrifugal hollow PC pillar (40) into the excavation hole and fixing the lower end with in place concrete; (c) exposing the retaining wall, the steel band of the centrifugal concrete pile and the support bracket; (d) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars so that some ends of the steel bars embedded in the steel concrete beam or flat slab are coupled to the support bracket; And (e) placing concrete in the formwork to bury the support bracket; building construction method comprising a. The method of claim 8, The support bracket includes an upper support bracket 41 and a lower support bracket 42 attached to upper and lower ends of the steel band, respectively. Among the steel bars embedded in the steel concrete beam or flat slab, the upper reinforcing bar 51 is coupled to the upper support bracket 41, and the lower reinforcing bar 52 is coupled to the lower support bracket 42. Construction method. (a) constructing a retaining wall along a boundary where the underground structure is to be constructed, and excavating a ground at a position to be a column to form an excavation hole; (b) a centrifugal hollow PC pillar including a centrifugal concrete pile 11 having a hollow 10a and an uneven portion 61 integrally formed with concrete so as to protrude from a surface at a part of an outer circumferential surface of the centrifugal concrete pile ( Inserting 60) into the excavation hole and fixing a lower end into place concrete; (c) exposing the uneven portions of the wall and the centrifugal concrete pile by digging; (d) installing formwork for constructing steel concrete beams or flat slabs and simultaneously reinforcing the steel bars embedded in the steel concrete beams or flat slabs; And (e) pouring concrete into the formwork so as to bury the uneven portion; building construction method comprising a. The method of claim 10, The centrifugal hollow PC pillar further comprises a support bracket (62) integrally formed to protrude from the lower portion of the uneven portion. (a) constructing a retaining wall along a boundary where the underground structure is to be constructed, and excavating a ground at a position to be a column to form an excavation hole; (b) a centrifugal hollow PC pillar including a centrifugal concrete pile 11 having a hollow 10a and an uneven portion 61 'integrally formed of concrete so as to protrude from the surface over the entire outer circumferential surface of the concrete pile. Inserting it into the excavation hole and fixing a lower end in place with concrete; (c) exposing the uneven portions of the wall and the centrifugal concrete pile by digging; (d) installing formwork for constructing steel concrete beams or flat slabs and simultaneously reinforcing the steel bars embedded in the steel concrete beams or flat slabs; And (e) pouring concrete into the formwork to fill a portion of the uneven portion; building construction method comprising a. The method of claim 12, The centrifugal hollow PC pillar further comprises a support bracket (62 ') integrally formed to protrude from the uneven portion. The method of claim 12, Reinforce the reinforcing bar 71 in the longitudinal direction on the outer surface of the pillar, Building construction method characterized in that it further comprises the step of pouring concrete (72) on the outside. The method according to any one of claims 1 to 14, Building construction method characterized in that it further comprises the step of pouring and curing concrete inside the hollow (10a) of the centrifugal concrete pile. The method of claim 15, When the centrifugal concrete pile is exposed by the trench, the building construction method comprising the step of inspecting the concrete filling state inside the hollow (10a), and performing a grouting process. The method according to any one of claims 1 to 14. And inserting a steel pillar (23) into the hollow (10a) of the centrifugal concrete pile, and filling and curing concrete in an empty space between the steel pillar and the hollow inner circumferential surface. The method according to any one of claims 1 to 14, Inserting the centrifugal hollow PC pillar into the excavation hole and fixing the lower end, Installing the bottom steel frame 16 to protrude in the bottom hollow 10a of the centrifugal concrete pile; And And placing the concrete in place to bury the bottom of the bottom steel frame (16) and the centrifugal concrete pile. The method according to any one of claims 1 to 14, In the step of inserting the centrifugal hollow PC pillar into the excavation hole and fixing the lower end, Building construction method, characterized in that the in-place concrete is poured to bury the protruding portion (11b) protruding to the lower end of the centrifugal concrete pile (11). The method according to any one of claims 1 to 14, The bottom of the centrifugal concrete pile 11 is provided with a lower fixing ring 19 made of a metal material, In the state in which the PC structure 20 is connected to the lower portion of the lower fixing ring 19 by the metal connector 21, the centrifugal hollow PC pillar is inserted into the excavation hole and placed in place concrete. Construction construction method. (a) A centrifugal concrete pile 11 having a hollow 10a, a steel band 12 fixed to surround a part of an outer circumferential surface of the concrete pile, and a support bracket 41 attached to surround the outer circumferential surface of the steel band. Installing the centrifugal hollow PC pillar 40 including a) at a position to be a pillar of the building; (b) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the reinforcing bars so that some ends of the steel bars embedded in the steel concrete beam or flat slab are coupled to the support bracket; And (c) placing concrete in the formwork to bury the support bracket; building construction method comprising a. The method of claim 21, The support bracket includes an upper support bracket 41 and a lower support bracket 42 attached to upper and lower ends of the steel band, respectively. Among the steel bars embedded in the steel concrete beam or flat slab, the upper reinforcing bar 51 is coupled to the upper support bracket 41, and the lower reinforcing bar 52 is coupled to the lower support bracket 42. Construction method. (a) a centrifugal hollow PC pillar including a centrifugal concrete pile 11 having a hollow 10a and an uneven portion 61 integrally formed with concrete so as to protrude from a surface on a part of an outer circumferential surface of the centrifugal concrete pile ( 60) in the position where the pillar of the building will be; (b) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars embedded in the steel concrete beam or flat slab; And and (c) pouring concrete into the formwork to bury the uneven portion. The method of claim 23, wherein The centrifugal hollow PC pillar further comprises a support bracket (62) integrally formed to protrude from the lower portion of the uneven portion. (a) Centrifugal hollow pillar having a centrifugal concrete pile 11 having a hollow 10a and an uneven portion 61 'integrally formed with concrete so as to protrude from a surface over the entire outer circumferential surface of the concrete pile. Installing at a position to be a pillar of the building; (b) installing the formwork for constructing the steel concrete beam or flat slab and simultaneously reinforcing the steel bars embedded in the steel concrete beam or flat slab; And (c) pouring concrete into the formwork so as to fill a portion of the uneven portion; building construction method comprising a. The method of claim 25, The centrifugal hollow PC pillar further comprises a support bracket (62 ') integrally formed to protrude from the uneven portion. The method of claim 25, Reinforce the reinforcing bar 71 in the longitudinal direction on the outer surface of the pillar, Building construction method characterized in that it further comprises the step of pouring concrete (72) on the outside. The method according to any one of claims 21 to 27, Building construction method characterized in that it further comprises the step of pouring and curing concrete inside the hollow (10a) of the centrifugal concrete pile. The method according to any one of claims 21 to 27. And inserting a steel pillar (23) into the hollow (10a) of the centrifugal concrete pile, and filling and curing concrete in an empty space between the steel pillar and the hollow inner circumferential surface. delete A cylindrical centrifugal concrete pile 11 having a hollow 10a formed therein; An uneven portion 61 formed integrally with concrete to protrude from a surface at a part of an outer circumferential surface of the centrifugal concrete pile 11 and formed at a position corresponding to the reinforced concrete beam or flat slab to be constructed; And And a support bracket (62) integrally formed of concrete so as to protrude outward from the lower portion of the uneven portion. delete A cylindrical centrifugal concrete pile 11 having a hollow 10a formed therein; An uneven portion 61 'integrally formed of concrete to protrude from the surface over the entire length of the outer circumferential surface of the centrifugal concrete pile 11; And And a support bracket (62 ') integrally formed of concrete so as to protrude outwardly from the uneven portion.

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