KR102173079B1 - Composite phc pile for soil retaining wall - Google Patents

Abstract

The synthetic PHC file for earthing walls according to the present invention, in the PHC file used in the construction of the earthing wall, the PHC pile body in which a plurality of PC steel wires are embedded and a hollow portion extending along a length direction is formed; A hollow concrete portion formed by pouring concrete into the hollow portion; And an order hole formed at one side of the PHC pile body receiving earth pressure to communicate with the hollow portion at a predetermined interval along the length direction of the PHC pile body. It may include.

Description

Synthetic PHC file for soil barrier walls to improve the order performance {COMPOSITE PHC PILE FOR SOIL RETAINING WALL}

The present invention relates to a synthetic PHC file for a soil barrier wall, and more particularly, to a synthetic PHC file for a soil barrier wall for improving the order performance that can be used as a permanent wall using a conventional soil barrier wall constructed using a PHC file.

In general, when a building or structure is erected, foundation work is performed to reinforce the ground to support the upper structure according to the conditions of the ground or the load of the structure.

At this time, in the case of hard ground with sufficient strength to support the structure, the ground in contact with the structure is to perform foundation work directly on the ground. In the case of soft ground, on the other hand, in order to prevent ground subsidence, the foundation work is carried out after the designated construction to improve the ground or to drive a pile. For reference, the soft ground refers to a case in which the ground itself cannot withstand the load transmitted from the structure installed on the upper part or the predicted settlement exceeds the allowable value, such as soft clay, loose sandy soil, and organic soil.

On the other hand, the pile is one of the basic types adopted when the depth of the support layer is high, and the weight of the structure can be stably supported in the support layer by constructing an upper structure on the pile inserted into the support layer. Types of piles include concrete piles, steel pipe piles, Pretensioned spun High strength Concrete piles (PHC piles), and composition piles.

In general, in the construction of large facilities with a large load such as plant facilities, since the driving depth of the pile is very deep up to the underground rock layer, steel pipe piles or PHC piles are frequently used.

At this time, a steel pipe pile is used for a part where the axial stiffness is large, and a PHC pile is used for a relatively small axial stiffness. In other words, PHC piles are used for structures with a large influence of vertical force, and have the advantage of excellent economical efficiency and workability compared to steel pipe piles. On the other hand, in the structure where the influence of the level (shear force) and bending moment such as earth pressure and support load is large, the steel pipe pile is generally used because the resistance capacity of the steel pipe pile is larger than that of the PHC pile.

However, if a steel pipe pile is used, the ability to resist horizontal force and bending moment can be improved, but since the steel pipe pile is more expensive than the PHC pile, there is a problem that the overall construction cost for the foundation work increases.

Accordingly, in recent years, in order to reduce the construction cost of the foundation construction, an improved PHC pile with improved resistance to horizontal force and bending moment, that is, axial stiffness to the ground, has been developed.

The earth protection method is a temporary structure installed to prevent the collapse of the excavation surface or the inflow of soil by resisting earth pressure and water pressure as a means of securing a working space for the installation of underground structures, but recently, as excavation work in urban areas has become more frequent However, the purpose of use is gradually diversifying, such as construction for the purpose of building protection. The construction of such a barrier wall is applied by selecting a construction method that satisfies stability, constructability, and economic feasibility in consideration of the site conditions and surrounding matters (land conditions, groundwater level distribution, underground buried objects, adjacent facilities, etc.).

As the most commonly used soil wall, H-beam + earth pipe (wood), sheet pile wall, cast in place (CIP), cast-in-place soil cement wall (SCW: Soil Cement) Wall), underground continuous wall (Slurry Wall), etc.

H-beam + earth plate is installed where groundwater does not exist, and where groundwater exists, the remaining construction methods are used. For the earth retaining wall composed of H-beam + earth plate, the ground is drilled using an auger equipment, and the H-beam is installed near the boundary of the excavation surface at predetermined intervals, and the earth plate is sandwiched between both H-beams at the same time as excavation. It is a construction method that goes down and is used as a barrier wall, and wood is mainly used as the earth plate.

The steel pile wall is a construction method of forming a temporary wall with an earthen barrier by installing the sheet-pile section steel into the ground with a vibrating hammer drill and continuously installing them so that they are bitten.

For CIP, the ground is drilled using auger equipment, and H-beams are installed near the boundary of the excavation surface at predetermined intervals, and drilled in the same way between them, and then assemble and insert a reinforcing bar network. This is a method of forming a temporary wall by making piles by placing cement mortar or concrete on-site.

The main column type soil cement retaining wall (SCW) uses a three-axis auger to drill the ground three holes at a time, and at the same time add and stir cement mortar to form a soil-cement mixed pile in the ground.In one hole, an H-beam partition It is a method of forming a temporary wall with a main column type earthen membrane by repeating the construction so that it is inserted and bited one by one.

In the Slurry Wall, in order to prevent collapse of the excavation surface and penetration of groundwater, a stabilizer (bentonite) is injected while excavating the ground of the wall part, inserting the reinforcing reinforcing bar, and pouring concrete to continue reinforced concrete in the ground. It is a method of forming a wall.

In addition, in recent years, instead of using cast-in-place piles, PHC piles, which are a kind of ready-made concrete piles, have been used a lot in constructing earthen walls. In order to use such a PHC pile as a wall, the PHC piles located adjacent to each other are connected using a strip.

In this way, the construction of the earth retaining wall using the PHC pile has the advantage that it can be used as a permanent wall of an underground structure without removing the PHC pile constituting the earth retaining wall after excavation. However, in the case of such a construction method, it is necessary to prevent the inflow of groundwater through the PHC piles excavated in the ground.

Conventionally, a method such as inserting a grouting casing between PHC piles, injecting a kraut material for ordering through the casing, and then pulling out the casing or constructing a separate ordering wall has been used.

However, in the case of the construction process of inserting the crouting casing and injecting the crout material as described above, there is a problem that the overall construction cost increases because the construction process becomes complicated because a process according to the insertion and drawing of the crouting casing is added. In addition, even if the ordering wall is separately constructed, the construction process is complicated as well as the construction process is complicated because the earthing wall and the ordering wall have to be separately constructed, which is a cumbersome problem.

Accordingly, the present applicant has proposed the present invention in order to solve the above problems, and as a prior art document related thereto, Korean Patent Publication No. 10-0696271 (Name of the invention: ready-made concrete used in a permanent retaining structure There is a file, registration date: 2007. 03. 12.).

It is an object of the present invention to provide a synthetic PHC file for a retaining wall that can have sufficient stiffness and ordering effect in order to use the constructed dirt retaining wall as a permanent wall without performing the construction to form a separate ordering wall during the construction of the retaining wall. To provide.

The problem to be solved by the present invention is not limited to the problems mentioned above, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The object of the above is, in accordance with the present invention, in the PHC pile used for the construction of the earthing wall, the PHC pile body in which a plurality of PC steel wires are embedded and a hollow part extending along a length direction is formed; A hollow concrete portion formed by pouring concrete into the hollow portion; And an order hole formed to communicate with the hollow part at a predetermined interval along the length direction of the PHC pile body on one side of the PHC pile body receiving earth pressure. It may be achieved by a synthetic PHC pile for a soil barrier wall. .

The order hole may discharge a part of the concrete injected into the hollow part to the outside of the PHC pile body during the process of pouring concrete into the hollow part.

In the process of pouring concrete into the hollow part, a part of the concrete injected into the hollow part is discharged to the outside of the PHC pile body through the order hole to form an order structure filling the gap between the adjacent PHC piles. have.

The order hole may be formed radially with respect to the hollow portion so as to guide a portion of the concrete injected into the hollow portion to the outside of the PHC pile body toward a gap between the adjacent PHC piles.

The order hole includes a first order hole for discharging a part of the concrete injected into the hollow portion toward a neighboring PHC pile located on the left side, and a second order hole for discharging toward a neighboring PHC pile side located on the right. I can.

It is installed in the inside of the order hole, the synthetic PHC pile may further include a guide pipe embedded in the concrete constituting the PHC pile body during manufacture of the installation is installed.

An order groove having a concave shape may be formed on an outer surface of the PHC pile body in which the order hole is located so that concrete discharged to the outside through the order hole is concentrated between the adjacent PHC piles.

A reinforcing reinforcing bar assembly inserted and installed in the hollow part of the PHC pile body before pouring concrete into the hollow part; And a support plate connected to an upper end of the reinforcing bar assembly and disposed at an upper end of the PHC pile body, and having a concrete injection hole for pouring concrete into the hollow portion.

The support plate has a plurality of through holes formed at positions corresponding to at least two of the plurality of PC nuts embedded in the upper end of the PHC pile body, inserted through the through holes, one end is fastened to the PC nut, and the other end May further include a connection member exposed to the outside of the support plate and coupled to the head reinforcement assembly.

A plurality of insert holes formed at predetermined intervals along the length direction of the PHC pile body; And an insert member installed inside the insert hole and embedded in concrete constituting the PHC pile body when manufacturing the PHC pile, wherein the insert hole is on the other side of the PHC pile body opposite to the order hole. It is formed so that the insert member may be combined with a structure installed on the other side of the PHC pile body when constructing the earth wall.

In the composite PHC pile for a dirt wall of the present invention, the concrete poured in the hollow part of the PHC pile body during the construction of the dirt wall is discharged to the outer surface of the PHC pile body through the order hole to form an order structure. Can improve its strength.

In addition, the synthetic PHC pile for the earthing wall of the present invention can improve the rigidity of the PHC pile itself by filling the reinforcing bar assembly and concrete in the hollow portion of the PHC pile.

1 is a perspective view of a synthetic PHC pile for a retaining wall according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of a synthetic PHC pile for an earthing wall shown in FIG.
FIG. 3 is a perspective view of a soil barrier wall to which the synthetic PHC pile for the soil barrier wall shown in FIG. 1 is applied.
4 is a cross-sectional view of AA shown in FIG. 2.
5 is a cross-sectional view of a retaining wall formed by using the PHC pile shown in FIG. 4.
6 is a modified example of the PHC file shown in FIG. 4.
7 is a cross-sectional view of a retaining wall formed by using the PHC pile shown in FIG. 6.
7 is a cross-sectional view of a retaining wall formed by using the PHC pile body shown in FIG. 6.
8 is a perspective view of a mold assembly for manufacturing a synthetic PHC pile for a retaining wall according to embodiments of the present invention.
9 is a cross-sectional view of the BB portion shown in FIG. 8.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

Note that the drawings are schematic and have not been drawn to scale. Relative dimensions and ratios of parts in the drawings are exaggerated or reduced in size for clarity and convenience in the drawings, and any dimensions are illustrative only and not limiting. In addition, the same reference numerals are used to indicate similar features to the same structure, element, or part appearing in two or more drawings.

Examples of the present invention specifically represent ideal embodiments of the present invention. As a result, various modifications of the drawings are expected. Accordingly, the embodiment is not limited to a specific shape in the illustrated area, and includes, for example, a modification of the shape by manufacturing.

Hereinafter, with reference to the accompanying drawings, a synthetic PHC file (100, hereinafter'composite PHC file') for a dirt barrier according to an embodiment of the present invention will be described.

1 is a perspective view of a synthetic PHC pile for a retaining wall according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a composite PHC file for a retaining wall shown in FIG. 1, and FIG. 3 is a composite for a retaining wall shown in FIG. A perspective view of a retaining wall to which a PHC pile is applied, FIG. 4 is a cross-sectional view of AA shown in FIG. 2, FIG. 5 is a cross-sectional view of a retaining wall formed using the PHC pile shown in FIG. 4, and FIG. 6 is a PHC pile shown in FIG. 7 is a cross-sectional view of the retaining wall formed using the PHC pile shown in FIG. 6, FIG. 7 is a cross-sectional view of the retaining wall formed using the PHC pile body shown in FIG. 6, and FIG. 8 is an implementation of the present invention. A perspective view of a mold assembly for manufacturing a synthetic PHC pile for an earthing wall according to examples, and FIG. 9 is a combined cross-sectional view of the BB portion shown in FIG. 8.

First, a synthesized PHC file 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

As shown in FIGS. 1 to 7, the composite PHC file 100 according to an embodiment of the present invention includes a plurality of PC steel wires (not shown) and a hollow part 112 extending along the length direction is formed. PHC file body 110; The hollow part 111 formed by pouring concrete into the hollow part 112 and the hollow part 111 at a predetermined interval along the length direction of the PHC pile body 110 on one side of the PHC pile body 110 subjected to earth pressure ( It includes an order hole 118 formed to communicate with 112).

1 to 3, the PHC pile body 110 is formed by pouring concrete using a press-tension method and then applying a centrifugal force. Accordingly, the PHC pile body 110 is formed in a cylindrical shape extending in the longitudinal direction, and a hollow portion extending along the length direction of the PHC pile body 110 by the centrifugal force applied to the PHC pile body 110 ( 112) is formed.

1 to 3, a band-band 113 is formed on the upper end of the PHC pile body 110. The band-band 113 is for finishing the upper end, that is, the head, of the PHC pile body 110 during wall construction.

Meanwhile, although not shown in the drawing, a plurality of PC nuts 114 and a PC steel wire (not shown) are built into the PHC pile body 110.

The PC nut 114 and the PC steel wire provide strength against compressive force to the synthetic PHC pile 100 by transmitting prestressed to the PHC pile body 110 to improve the strength against the compressive force of the synthetic PHC pile 100 I can make it. The PC nut 114 and the PC steel wire are provided in plural in the PHC pile body 110 at regular intervals, and the PC steel wire is inserted and fixed inside the PC nut 114. The PC nut 114 and the PC steel wire are embedded in the PHC pile body 110 in the course of curing the concrete constituting the synthetic PHC pile 100.

1 and 2, the hollow concrete part 111 is formed by pouring concrete into the hollow part 112. In other words, the hollow concrete part 111 is formed by pouring concrete into the hollow part 112 in a state in which the reinforcing reinforcing bar assembly 120 to be described later is inserted.

Here, as shown in FIGS. 1 and 2, the order hole 118 is formed in the PHC pile body 110. That is, an order hole 118 is formed on one side receiving the earth pressure of the PHC pile body 110, and an insert hole 116a and an insert member 116 to be described later are formed on the other side not receiving the earth pressure from the PHC pile body 110. Is located.

As such, the order hole 118 is for filling a gap formed between the composite PHC piles 100 positioned adjacent to each other.

In general, when a wall is constructed using a synthetic PHC pile 100, a gap is inevitable between the synthetic PHC piles 100 located adjacent to each other due to earth pressure or groundwater, so between the synthetic PHC piles 100 The ordering work to fill the gap formed in must be accompanied.

These order holes 118 are formed at predetermined intervals along the length direction of the PHC pile main body 110 on one side of the PHC pile main body 110 subjected to earth pressure. At this time, as shown in FIGS. 4 and 5, the order hole 118 is formed to communicate with the hollow part 112 of the PHC pile body 110. Particularly, in the process of pouring concrete into the hollow part 112, a part of the concrete injected into the hollow part 112 is discharged to the outside of the PHC pile body 110, that is, to the outer surface through the order hole 118. The concrete discharged through the order hole 118 forms an order structure C that fills the gap between the composite PHC piles 100 positioned adjacent to each other.

For reference, although not shown in the drawings, a separate ordering wall (not shown) is formed in the case of construction of the soil barrier wall using the synthetic PHC pile 100 according to an embodiment of the present invention. At this time, the order wall is formed in a portion of the synthetic PHC pile 100 in which a structure such as a strip 10 and a combined wall (not shown) is not installed using a grouting method using concrete or mortar. In this way, separately forming the ordering wall improves the strength of the retaining wall, and after installing a plurality of synthetic PHC piles 100, when installing a structure such as a combined wall or strip 10 on the other side of the synthetic PHC pile 100 This is to prevent the positions of the installed plurality of synthetic PHC files 100 from being moved or disturbed.

As described above, if the ordering structure (C) according to an embodiment of the present invention is firstly installed before the construction of the ordering wall on the earthing wall, it is possible to further improve the strength of the earthing wall.

Meanwhile, referring to FIGS. 4 to 7, the order hole 118 is formed in a radial shape based on the hollow part 112 formed in the PHC pile body 110.

Specifically, the order hole 118 is formed at a predetermined interval along the length direction on one side of the PHC pile body 110 receiving the earth pressure, the hollow part 111 of the PHC pile body 110, that is, the PHC pile body ( 110) is formed in a radial form in the left or right direction based on the center line CL. That is, the order hole 118 is a first order hole 118 for discharging a part of the concrete injected into the hollow part 112 toward the neighboring synthetic PHC pile 100 located on the left side, and the neighboring compound located on the right side. It may include a second order hole 118 discharged toward the PHC pile 110 side. For reference, since the first order hole 118 and the second order hole 118 are formed in the same shape and position, the same reference numerals are given.

For example, the order hole 118 according to an embodiment of the present invention is disposed radially while forming an angle of about 45° with the center line C.L of the PHC pile body 110. For reference, in FIG. 4, although it is shown that the PHC pile body 110 is formed on both the left and right sides based on the center line C.L, it may be formed only on either the left or the right side, and is not limited thereto.

However, since the order structure (C) is for filling the gap formed between the synthetic PHC piles 100 adjacent to each other, the order hole 118 is on both the left and right sides based on the center line (CL) of the PHC pile body 110 It is preferably formed in a radial form.

In addition, a guide tube 117 is installed inside the order hole 118. Such a guide pipe 117 holds the position of the order hole 118 in the PHC pile body 110 in the process of forming the order hole 118, and the concrete adheres to the inside of the formed order hole 118. To prevent it. To this end, the guide pipe 117 according to an embodiment of the present invention is formed of a PVC pipe (rigid poly vinyl chloride pipe), and its length may be formed within a range of about 2cm to 5cm. For reference, the length of the guide tube 117 may vary depending on the length and shape of the order hole 118.

On the other hand, the guide pipe 117 is installed embedded in the concrete constituting the PHC pile body 110 when the synthetic PHC pile 100 is manufactured.

As described above, the synthetic PHC pile 100 is formed by pouring concrete into a mold and performing centrifugal molding by rotating the mold, and then curing and demolding the mold. At this time, if the guide pipe 117 is fixed to the mold and then the mold is rotated before pouring concrete into the mold, a space is formed inside the PHC pile body 110 by the guide pipe 117, and this space is described above. It is desirable to see it as one order hole 118. That is, since the order hole 118 is formed in the PHC pile body 110 by the guide pipe 117 in the process of embedding the guide pipe 117 in the PHC pile body 110, the PHC pile body 110 It is not necessary to separately form the order hole 118.

Here, as described above, only the order hole 118 is formed on one side receiving the earth pressure of the PHC pile body 110, and the insert hole 116a and the insert member ( It is desirable that only 116) be located.

If the insert hole 116a and the insert member 116 are formed together with the order hole 118 on one side of the PHC pile body 110 receiving the earth pressure, the hollow part 112 of the PHC pile body 110 The injected concrete may be discharged to the outside of the synthetic PHC pile 100 through the insert hole 116a and the insert member 116 as well as the order hole 118. In this case, it may be difficult to install a structure such as an installation member 12 and a combined wall (not shown) for installing the strip 10, the strip 10 using the insert hole 116a and the insert member 116. have. Moreover, when concrete is poured into the hollow part 112 of the PHC pile body 110 with the belt length 10 and the installation member 12 fastened to the synthetic PHC pile 100, the insert hole 116a and the insert member ( Since the concrete may harden in 116), it becomes difficult to separate the strip 10 and the installation member 12 from the PHC pile body 110.

Meanwhile, referring to FIGS. 6 and 7, an order groove 119 is formed on the outer surface of the PHC pile body 110 in which the order hole 118 is located. The order groove 119 is formed on the outer surface of the PHC pile body 110 where the order hole 118 is located, and the concrete discharged to the outside through the order hole 118 is between the synthetic PHC piles 100 adjacent to each other. It is to keep you focused. That is, the order groove 119 is for collecting concrete discharged through the order hole 118 toward the gap formed between the adjacent synthetic PHC piles 100.

The order groove 119 may be formed in a concave shape, and this is not necessarily limited. For reference, the order groove 119 is preferably formed in a shape in which the concrete discharged to the outside through the order hole 118 can be concentrated in the gap between the composite PHC piles 100 adjacent to each other. Also, the order groove 119 may be formed in the process of forming the composite PHC pile 100.

Meanwhile, referring to FIGS. 1 to 7, a reinforcing reinforcing bar assembly 120 is inserted into the hollow part 112 of the PHC pile body 110 before the concrete is poured into the hollow part 112. The reinforcing reinforcing bar assembly 120 is inserted and installed in the hollow part 112 formed in the PHC pile body 110 to improve the rigidity of the synthetic PHC pile 100.

The reinforcing bar assembly 120 is provided with a first reinforcing bar 122 and a second reinforcing bar 124. A plurality of first reinforcing bars 122 are disposed at regular intervals in the longitudinal direction, that is, in the vertical direction, of the PHC pile body 110, and the second reinforcing bars 124 are disposed in the width direction of the PHC pile body 110, that is, horizontally. A plurality of them are arranged at regular intervals in the direction. At this time, the first reinforcing bar 122 and the second reinforcing bar 124 are provided in a general reinforcing bar shape, and their thickness and size may vary depending on the shape and size of the PHC pile body 110.

Here, the second reinforcing bar 124 is installed along the circumference of the first reinforcing bar 122 to fix the first reinforcing bar 122 disposed in the length direction of the PHC pile body 110. At this time, the second reinforcing bar 124 is coupled to the circumference of the first reinforcing bar 122 through various methods such as welding. For reference, the second reinforcing bar 124 may bind the plurality of first reinforcing bars 122 to each other in various shapes, such as a circular shape or a square shape, rather than a spiral shape around the first reinforcing bar 122.

As described above, since the first reinforcing bar 122 is provided along the vertical direction of the PHC pile body 110 and the second reinforcing bar 124 is provided along the horizontal direction of the PHC pile body 110, the PHC pile body It is possible to improve the resistance to the bending moment and compressive force of (110).

Meanwhile, referring to FIGS. 1 to 3, the synthetic PHC pile 100 according to an embodiment of the present invention further includes a support plate 130.

The support plate 130 is formed in a circular or ring-shaped plate shape and is disposed on the upper end of the PHC pile body 110. At this time, the reinforcing bar assembly 120 is coupled to the lower end of the support plate 130. In other words, the support plate 130 is disposed at the upper end of the PHC pile body 110 in a state in which the reinforcing bar assembly 120 is coupled to the lower end. Accordingly, the support plate 130 is exposed to the outside with respect to the PHC pile body 110, and the reinforcing bar assembly 120 is coupled to the lower end of the support plate 130, so that the hollow portion of the PHC pile body 110 ( 112), so it is not exposed from the PHC file body 110. As described above, as the support plate 130 and the reinforcing bar assembly 120 are structurally integrated, the rigidity of the synthetic PHC pile 100 can be improved, and the workability of the soil barrier wall using the synthetic PHC pile 100 is improved. I can make it. For reference, the reinforcing bar assembly 120 is fixed to the lower end of the support plate 130 using a method such as arc welding or spark welding.

In addition, a through hole 132 is formed in the support plate 130 at a position corresponding to the PC nut 114 embedded in the upper end of the PHC pile body 110. For reference, the through hole 132 is formed at a position corresponding to at least two, preferably three or more PC nuts 114 among a plurality of PC nuts 114 embedded in the upper end of the PHC pile body 110 . These through holes 132 are formed at predetermined intervals along the edge region of the support plate 130, that is, the circumference of the support plate 130. For reference, although it is illustrated that nine through holes 132 are formed in the support plate 130 in FIGS. 1 to 3, it is not limited thereto. That is, the number of through holes 132 varies depending on the number of PC nuts 114 embedded in the PHC pile body 110 or the shape of the head reinforcement assembly (not shown) coupled to the upper end of the synthetic PHC pile 100. I can.

Meanwhile, a concrete injection hole 134 is formed in the support plate 130. The concrete injection hole 134 is a hole for injecting concrete into the hollow part 112 of the PHC pile body 110 while the reinforcing reinforcing bar assembly 120 is inserted into the hollow part 112 of the PHC pile body 110. .

It is preferable that the support plate 130 as described above has the same diameter as the PHC pile body 110. Because, as shown in FIG. 3, since the retaining wall is made of a plurality of synthetic PHC piles 100, another synthetic PHC pile 100 must be located on one side of the synthetic PHC pile 100. If the diameter of the support plate 130 is formed larger than the diameter of the PHC pile body 110, the gap between the synthetic PHC piles 100 located adjacent to each other is too wide to secure rigidity for use as a permanent wall. It is difficult.

Meanwhile, as shown in FIG. 2, the composite PHC file 100 according to an embodiment of the present invention further includes a connection member 140.

Part of the connection member 140 is fastened with the PC nut 114 embedded in the PHC pile body 110, and another part of the connection member 140 is a support plate 130 that is coupled to the upper end of the PHC pile body 110 ) And exposed to the outside.

Specifically, the upper end of the connection member 140 passes through the through hole 132 formed in the support plate 130, but a portion of the connection member 140 is exposed to the outside of the support plate 130. At this time, although not shown in FIG. 3, a head reinforcing assembly (not shown) is coupled to the connection member 140 exposed to the upper end of the support plate 130. At this time, the connection member 140 may hold the head reinforcement assembly so that the position with respect to the PHC pile body 110 is not changed. Accordingly, it is possible to improve the workability of the soil barrier wall or floor surface using the synthetic PHC pile 100.

For reference, a separate head reinforcement coupling groove (not shown) may be formed in the connection member 140 to facilitate coupling with the head reinforcement assembly, but is not limited thereto. If, as described above, when the head reinforcement coupling groove for coupling with the head reinforcement assembly is formed in the connection member 140, the position of the head reinforcement assembly relative to the PHC pile body 110 can be more reliably held. do.

In addition, the lower end of the connection member 140 is fastened with the PC nut 114 embedded in the PHC pile body 110. To this end, a thread corresponding to the PC nut 114 is formed on the outer circumferential surface of the lower end of the connection member 140.

Meanwhile, referring to FIGS. 1 to 3, an insert hole 116a is formed in the PHC pile body 110. The insert holes 116a are formed at regular intervals along the length direction of the PHC pile body 110. At this time, the insert member 116 is installed inside the insert hole 116a. For reference, the number and shape of the insert holes 116a may vary depending on the number and shape of the insert members 116 inserted into the insert holes 116a.

Here, the insert hole 116a is formed on the other side of the PHC pile 110 opposite to the order hole 118 described above, so that the insert member 116 is installed on the other side of the PHC pile body 110 during construction of the wall. (10) It may be applied as a means for coupling with a structure such as an installation member 12 such as a bracket and a combined wall (not shown).

The insert member 116 is provided in a nut structure made of a metal material. The insert member 116 is fastened by inserting a bolt (not shown) for installing the strip 10 to a plurality of synthetic PHC piles 100 installed adjacent to each other when constructing the earthing wall. For reference, as shown in Fig. 3, a separate installation member 12 such as a bracket is installed in the synthetic PHC file 100, and the belt length 10 is supported by the installation member 12, or the synthetic PHC file It is also possible to directly fasten the strip (10) to (100).

Here, the synthetic PHC pile 100 pours concrete into a mold, rotates the mold 210 to perform centrifugal molding, and then undergoes a process of curing and demolding the mold. At this time, when the insert member 116 is inserted into the mold and the mold is rotated in the process of pouring concrete, the hollow part 112 is formed in the PHC pile body 110, and the insert hole 116a is formed by the insert member 116. ) Is formed. That is, the insert member 116 is embedded in the insert hole 116a. In other words, when the insert member 116 is embedded in the concrete constituting the PHC pile body 110 in the process of manufacturing the synthetic PHC pile 100, the insert member 116 embedded in the PHC pile body 110 As a result, a space is formed in the PHC pile body 110.

At this time, the space formed in the PHC pile body 110 by the insert member 116 becomes the insert hole 116a. In other words, since the insert member 116 is embedded in the concrete constituting the PHC pile body 110, and the insert hole 116a is formed accordingly, the insert member 116 is embedded in the PHC pile body 110. Therefore, there is no need to form a separate insert hole 116a. For reference, the division between the insert hole 116a and the insert member 116 is for explaining the composite PHC file 100 according to an embodiment of the present invention.

In addition, the insert member 116 may be formed in the form of a general insert nut in which at least one side of one side or the other side is closed, or may be formed in the form of a sleeve in which both one side and the other side are open, It is not necessarily limited thereto. However, in the synthetic PHC pile 100 according to an embodiment of the present invention to be described later, since the order hole 118 for the construction of the ordering work of the wall formed by the plurality of synthetic PHC piles 100 is formed, the insert member ( 116) is preferably formed in the form of an insert nut in which at least one side of one side or the other side is closed.

Meanwhile, referring to FIGS. 4 to 7, the composite PHC pile 100 according to an embodiment of the present invention further includes a watertight member 115. The watertight member 115 is located at the upper end of the insert member 120 so that the insert member 116 does not protrude from the outer circumferential surface of the PHC pile body 110, so that the upper end of the insert member 120 is attached to the belt length 10 and the bracket. It is possible to prevent damage by structures such as the same installation member 12 and a combined wall (not shown). The watertight member 130 is embedded in the concrete constituting the PHC pile body 110 while being placed on the upper end of the insert member 116 so as not to cover the hole of the insert member 116, together with the insert member 116.

Here, since the watertight member 115 according to an embodiment of the present invention is made of PE material (polyethylene) among synthetic resin materials, when embedded and installed together with the insert member 120 in the concrete constituting the PHC pile body 110 Its shape is transformed. For reference, it is preferable that the watertight member 115 is made of PE material (polyethylene) among synthetic resin materials, but it is not necessarily limited thereto, and it may be transformed into any of flexible materials except a hard metal material. have.

In addition, the watertight member 115 is formed in the form of a ring or ring-plate having a diameter larger than that of the insert member 116 in a line that does not block the hole of the insert member 116. When this type of watertight member 115 is embedded in the concrete constituting the PHC pile body 110 together with the insert member 116, the PHC pile main body 110 in the process of curing the concrete constituting the PHC pile body 110 It is transformed into a curved surface along the outer peripheral surface of ). In other words, the side portion of the rim of the watertight member 115 formed of a synthetic resin material is buried together in the concrete constituting the PHC pile body 110 so that the watertight member 115 is the same curved surface as the outer peripheral surface of the PHC pile body 110 It is transformed into a curved surface. That is, the watertight member 115 prevents damage to the upper end of the insert member 116, and one surface of the watertight member 115 is deformed into the same curved surface as the outer peripheral surface of the PHC pile body 110, so that the watertight member 115 ) Can be prevented from protruding from the outer circumferential surface of the PHC pile body 110 to facilitate fastening of the strip 10 to the synthetic PHC pile 100.

Hereinafter, with reference to FIGS. 1 to 9, a method of manufacturing a synthetic PHC pile 100 for a retaining wall according to an embodiment of the present invention and a process of introducing concrete into the PHC pile body 110 will be briefly described. .

First, a mold 210 is prepared. The mold 210 provides a space for pouring concrete and is formed in a hollow cylindrical shape, and is formed separately into an upper mold 212 and a lower mold 214.

Then, in order to form the order hole 118 in the PHC pile body 110, a plurality of first position fixing bolt holes 216 are formed at predetermined intervals along the length direction of the upper mold 212. In addition, although not shown in the drawing, in order to embed the insert member 116 in the PHC pile body 110, a bolt hole for fixing a second position at a predetermined interval along the length direction of the lower mold 214 (not shown) To form.

Then, the first position fixing bolt 220 is inserted into the first position fixing bolt hole 216 formed in the upper mold 212, and the first position fixing bolt 220 and the guide tube 117 Tighten. In addition, a second position fixing bolt (not shown) is inserted into a second position fixing bolt hole (not shown) formed in the lower mold 214, and the second position fixing bolt (not shown) and the insert member 116 ).

At this time, when fastening the first position fixing bolt 220 and the guide tube 117 to the first fixing bolt hole 216, it is preferable to fasten it at an angle with respect to the center of the mold 210. This is to obliquely form the order hole 118 formed in the PHC pile body 110.

Then, a PC steel wire (not shown) is placed inside the mold 210 in order to prestress the synthetic PHC pile 100. A spiral reinforcing bar (not shown) is wound and attached to the PC steel wire disposed inside the mold 210 by using arc welding or spark welding.

Here, if necessary, among the helical reinforcing bars wound around the PC steel wire, the helical reinforcing bars disposed at the portions interfering with the insert member 116 and the guide pipe 117 are cut. This is to prevent the helical reinforcement arranged around the PC steel wire from being eccentric in one direction, and the operator visually judges the helical wire disposed at the part that interferes with the insert member 116 and the guide pipe 117 using a tool. Cut the rebar.

For reference, in order to form the order groove 119, an iron plate (not shown) having a concave shape, that is, a convex shape on the inner side of the mold 210 may be installed in the mold 210. In this way, when a concave steel plate is installed inside the mold 210, the order groove 119 can also be formed in the PHC pile body 110 together with the order hole 118 when the synthetic PHC pile 100 is manufactured. There will be.

Then, concrete is put into the mold 210.

Then, when the curing of the concrete is finished, the first position fixing bolt 220 is removed from the upper mold 212 and the second position fixing bolt is removed from the lower mold 214. At this time, the guide pipe 117 fastened with the first position fixing bolt 220 and the insert member 116 fastened with the second position fixing bolt are embedded and installed in the synthetic PHC pile 100.

Then, after removing the first position fixing bolt 220 and the second position fixing bolt from the upper mold 212 and the lower mold 214, the mold 210 is demolded from the cured concrete. At this time, the hollow part 112 is formed inside the PHC pile body 110 by the centrifugal force applied to the mold 210.

Then, the reinforcing bar assembly 120 is inserted and installed in the hollow part 112 formed in the PHC pile body 110. Here, the reinforcing bar assembly 120 is fixedly coupled to the lower end of the support plate 130 by welding. The support plate 130 is located at the upper end of the PHC pile body 110, and the reinforcing reinforcing bar assembly 120 coupled to the lower end of the support plate 130 is inserted into the hollow part 112.

Then, the connection member 140 is used to fasten the PC nut 114 embedded in the PHC pile body 110 through the through hole 132 of the support plate 130.

Then, concrete is poured into the hollow part 112 of the PHC pile body 110 with the reinforcing reinforcing bar assembly 120 inserted thereinto to form the hollow concrete part 111. At this time, the concrete is poured into the hollow part 112 of the PHC pile body 110 through the concrete injection hole 134 formed in the support plate 130.

At this time, the concrete injected into the hollow part 112 is discharged to the outer surface of the PHC pile body 110 through the order hole 118. The discharged concrete fills the gap formed between the composite PHC pile 100 positioned adjacent to each other through the order hole 118 and the order groove 119.

For reference, the work of pouring concrete into the hollow part 112 may be performed in a factory forming the synthetic PHC pile 100, or after moving the synthetic PHC pile 100 to the construction site. However, in the case of the synthetic PHC pile 100 according to an embodiment of the present invention, since the concrete poured into the hollow part 112 is discharged to the outer surface of the PHC pile body 110 through the order hole 118, the synthesis Rather than pouring concrete into the hollow part 112 in the factory forming the PHC pile 100, the composite PHC pile 100 is embedded in the construction site, and then the concrete is poured through the concrete injection hole 134 of the support plate 130. It is preferable to pour.

According to the above-described configuration, the composite PHC pile for a dirt wall according to the present invention, in the process of constructing the dirt wall, is discharged to the outer surface of the PHC pile body through the order hole in the concrete poured into the hollow part of the PHC pile body. Because it is formed, the strength of the earthen wall can be improved.

In addition, the synthetic PHC pile for the earthing wall of the present invention can improve the rigidity of the PHC pile itself by filling the reinforcing bar assembly and concrete in the hollow portion of the PHC pile.

As described above, in one embodiment of the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but this is provided only to aid in a more general understanding of the present invention. It is not limited, and various modifications and variations are possible from these descriptions by those of ordinary skill in the field to which the present invention belongs. Accordingly, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things equivalent or equivalent to the claims as well as the claims to be described later belong to the scope of the inventive concept.

100: Synthetic PHC file for earthing wall
110: PHC pile body 111: hollow concrete part
112: hollow part 113: band band
114: PC nut 115: watertight member
116: insert member 116a: insert hole
117: guide tube
118: order hole (first hole, second hole)
119: order groove 120: rebar assembly
130: support plate 132: through hole
134: concrete injection port 140: connection member
200: mold assembly 210: mold
212: upper mold 214: lower mold
216: first position fixing bolt hole 220: first position fixing bolt

Claims (10)

In the PHC pile used for the construction of the earthing wall,
A PHC pile body in which a plurality of PC steel wires are embedded and a hollow part extending along the length direction is formed;
A hollow concrete portion formed by pouring concrete into the hollow portion;
An order hole formed at one side of the PHC pile body receiving earth pressure to communicate with the hollow portion at a predetermined interval along the length direction of the PHC pile body;
A reinforcing bar assembly inserted and installed in the hollow portion before pouring concrete into the hollow portion; And
Including; a support plate connected to the upper end of the reinforcing bar assembly and disposed at the upper end of the PHC pile body, and having a concrete injection hole for pouring concrete into the hollow part,
The reinforcing reinforcing bar assembly is inserted into the hollow in a state fixedly coupled to the lower end of the support plate,
When concrete is injected into the hollow portion in which the reinforcing reinforcing bar assembly is inserted at a construction site, concrete is poured into the hollow portion to form the hollow concrete portion, and at this time, the concrete injected into the hollow portion A part of the PHC pile is discharged to the outside of the PHC pile body through the order hole to form an order structure filling the gap between the adjacent PHC piles,
A plurality of insert holes formed at predetermined intervals along the length direction of the PHC pile body; And
It is installed inside the insert hole, the insert member made of a metal material which is embedded and installed in the concrete constituting the PHC pile body when the PHC pile is manufactured; further comprising,
The insert hole is formed on the other side of the PHC pile body opposite to the order hole, and is applied as a means for coupling the insert member with the structure installed on the other side of the PHC pile body when the earth wall is constructed,
A watertight member made of synthetic resin placed on one end of the insert member in a form that does not cover the hole of the insert member so as to prevent damage by protruding from the outer circumferential surface of the PHC pile body. ,
The watertight member is embedded in the concrete constituting the PHC pile body while being placed at one end of the insert member during the manufacture of the PHC pile, and is installed embedded in the concrete constituting the PHC pile body together with the insert member, and constitutes the PHC pile body when the PHC pile is manufactured. In the process of curing the concrete by centrifugal force, one surface of the watertight member is transformed into a curved surface along the outer circumferential surface of the PHC pile body so that it does not protrude from the outer circumferential surface of the PHC pile body.
delete delete The method of claim 1,
The order hole is formed in a radial shape based on the hollow portion so as to guide a portion of the concrete injected into the hollow portion to the outside of the PHC pile body toward a gap between the adjacent PHC piles. For synthetic PHC files.
The method of claim 4,
The order hole includes a first order hole for discharging a part of the concrete injected into the hollow portion toward a neighboring PHC pile located on the left side, and a second order hole for discharging toward a neighboring PHC pile side located on the right side. Synthetic PHC file for an earthen wall, characterized in that.
The method of claim 1,
A synthetic PHC pile for a dirt barrier wall, characterized in that it further comprises a guide pipe installed inside the order hole and embedded in concrete constituting the PHC pile body when the synthetic PHC pile is manufactured.
The method of claim 1,
A dirt barrier wall, characterized in that a concave-shaped order groove is formed at a portion where the order hole is located on the outer surface of the PHC pile body so that concrete discharged to the outside through the order hole is concentrated between the adjacent PHC piles. For synthetic PHC files.
delete The method of claim 1,
The support plate has a plurality of through holes formed at positions corresponding to at least two of a plurality of PC nuts embedded in the upper end of the PHC pile body,
Synthetic PHC pile for earthing walls, characterized in that it further comprises a connection member inserted through the through hole and coupled to the head reinforcement assembly by being inserted at one end to the PC nut and the other end to be exposed to the outside of the support plate.
delete

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