KR20190077888A - Composite phc pile for soil retaining wall - Google Patents

Abstract

According to the present invention, a composite PHC pile for a soil retaining wall, which is used in construction of a soil retaining wall, includes: a PHC pile main body having a hollow portion in which a plurality of PC steel wires are embedded and which is extended along a longitudinal direction; a reinforcing bar assembly inserted into the hollow portion of the PHC pile main body; a hollow concrete part formed by placing concrete in a state that the reinforcing bar assembly is inserted into the hollow portion; and a support plate connected to an upper end portion of the reinforcing bar assembly and provided on an upper end portion of the PHC pile main body.

Description

Composite PHC file for an earth retaining wall {COMPOSITE PHC PILE FOR SOIL RETAINING WALL}

The present invention relates to a synthetic PHC file for an earth retaining wall, and more particularly to a synthetic PHC file for an earth retaining wall having improved rigidity and workability by using a conventional PHC file.

In general, when a building or structure is built, basic works are carried out to reinforce the ground in order to support the upper structure according to the condition of the ground or the load of the structure.

At this time, in the case of hard ground with sufficient rigidity to support the structure, the ground is directly underfloored. On the other hand, in the case of the soft ground, the foundation work is carried out after performing the geotechnical construction to increase the pile or the ground so that the subsidence does not occur. For reference, soft ground means that the ground itself can not withstand the load from the structure installed on the upper part, such as soft clay, loose sand or organic soil, or the predicted settlement exceeds the allowable limit.

On the other hand, the file is one of the basic types adopted when the depth of the supporting layer is high, and it is possible to stably support the weight of the structure in the supporting layer by constructing the upper structure on the pile inserted up to the supporting layer. Types of files include concrete pile, steel pipe pile, PHC file (Pretensioned spun High strength Concrete pile) and composition pile.

On the whole, in large-scale facility construction such as plant facility, heavy use of steel pipe file or PHC file is required because the piling depth of the pile is very deep to the underground rock layer.

At this time, the steel pipe file is used for the part where the shaft stiffness is greatly needed, and the PHC file is used for the part where the shaft stiffness is relatively small. That is, the PHC file is advantageous in that it is used in a structure having a large influence of vertical force, and is more economical and workable than a steel pipe file. On the other hand, steel pipe files are generally used for structures with large impacts of horizontal forces (shear force) and bending moments such as earth pressure and support load, because they have greater resistance to steel pipe files than PHC files.

However, using a steel pipe file can improve the resistance to horizontal force and bending moment, but the steel pipe file is more expensive than the PHC file, which increases the overall construction cost for foundation work.

Recently, an improved PHC file has been developed in which the resistance to horizontal and bending moments, that is, the axial stiffness of the ground, is improved in order to reduce the construction cost of the foundation work.

The present applicant has proposed the present invention in order to solve the above-mentioned problems, and as a prior art document related thereto, Korean Patent Registration No. 10-1636225 (entitled: transverse stiffness reinforced inner reinforced concrete ICP File and method of construction thereof, registration date: June 26, 2016).

It is an object of the present invention to provide a synthetic PHC file for earth retaining walls that can significantly improve the rigidity and workability of the PHC pile by filling the hollow portion of the PHC file with a reinforcing steel assembly and concrete.

It is also an object of the present invention to provide a synthetic PHC file for earth retaining walls that can facilitate the coupling of a head reinforcement assembly coupled with a PHC file.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to the present invention, there is provided a PHC file used for constructing an earth retaining wall, comprising: a PHC file body having a plurality of PC steel wires embedded therein and a hollow portion extending along the longitudinal direction; A reinforcing steel assembly inserted into the hollow portion of the PHC pile main body; A hollow concrete part formed by pouring concrete in a state where the reinforcing steel assembly is inserted into the hollow part; And a support plate connected to an upper end of the rebar assembly and disposed at an upper end of the PHC pile body; RTI ID = 0.0 > PHC < / RTI > file for an earth retaining wall.

The reinforcing steel assembly may be inserted into the hollow portion with the upper end thereof coupled to the support plate.

The support plate may have a concrete injection port for pouring concrete into the hollow portion.

Wherein 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 and a connection member inserted through the through holes and fastened to the PC nuts .

The connecting member includes: a body portion inserted through the through hole and fastened to the PC nut; And a head portion extending upward from the body portion and exposed to the outside of the support plate and engaged with the head reinforcement assembly.

The connecting member may include a head coupling groove into which the lower end of the head reinforcement assembly is inserted to position the head reinforcement assembly.

The installation height of the head reinforcement assembly can be adjusted according to the fastening depth of the connecting member and the PC nut.

Wherein the connecting member is formed with a bolt hole for height adjustment in a direction intersecting with the toe coupling groove and a fixing bolt is inserted into the head portion of the height adjusting bolt hole in a state where a lower end of the head reinforcing assembly is inserted into the toe coupling groove, So that the installation height of the head reinforcement assembly can be adjusted by fixing the position of the lower end of the head reinforcement assembly.

The connecting member may include a step portion for pressing the support plate against the upper end of the PHC pile main body in a state that the connection member is fastened to the PC nut so as to firmly fix the support plate to the upper end of the PHC pile main body.

In addition, the present invention provides a PHC file used for constructing an earth retaining wall, comprising: a PHC file body having a plurality of PC steel wires embedded therein and a hollow portion extending along the longitudinal direction; A reinforcing steel assembly inserted into the hollow portion of the PHC pile main body; A hollow concrete part formed by pouring concrete in a state where the reinforcing steel assembly is inserted into the hollow part; And a connecting member connected to the head reinforcement assembly, which is fastened to the PC nut embedded in the upper end of the PHC pile body, and a synthetic PHC pile for the earth retaining wall.

The connecting member includes: a body portion to be coupled to the PC nut; And a head portion extending upward from the body portion and coupled to a lower end portion of the head reinforcement assembly.

Wherein the connecting member is formed with a head coupling groove into which the lower end of the head reinforcement assembly is inserted so as to position the head reinforcement assembly and adjust the position of the head reinforcement assembly according to the fastening depth of the connecting member and the PC nut. The installation height can be adjusted.

The composite PHC pile for earth retaining walls of the present invention can facilitate the coupling between the PHC pile and the head reinforcing assembly by using a connecting member.

In addition, the PHC file for the earth retaining wall of the present invention can improve the rigidity of the PHC file by structurally integrating the reinforcing steel assembly inserted into the hollow portion of the PHC pile main body and the supporting plate disposed at the upper end portion of the PHC pile main body , Thereby making it possible to improve the convenience of construction of the PHC file.

Further, in the PHC pile for earth retaining walls of the present invention, the installation height of the head reinforcing assembly coupled to the PHC pile can be easily adjusted by using the connecting member.

1 is a partially cutaway perspective view showing the construction of a composite PHC file for an earth retaining wall according to an embodiment of the present invention.
2 is an exploded perspective view of the synthetic PHC pile for the earth retaining wall shown in Fig.
3 is a view for explaining the combination of the synthetic PHC pile for earth retaining wall and the head reinforcing assembly shown in Fig.
4 is a partial cross-sectional view of the portion 'A' shown in FIG.
5 is a perspective view of the connection member shown in Fig.
6 and 7 are views for explaining a modification of the connecting member.
8 is a partially cutaway perspective view showing the construction of a composite PHC file for an earth retaining wall according to another embodiment of the present invention.
9 is a view for explaining the combination of the synthetic PHC pile for earth retaining wall and the head reinforcing assembly shown in Fig.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structure, element or component appearing in more than one drawing, the same reference numerals are used to denote similar features.

The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. As a result, various variations of the drawings are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture.

Hereinafter, a synthetic PHC file (hereinafter referred to as PHC file) for an earth retaining wall according to embodiments of the present invention will be described with reference to the accompanying drawings.

1 is an exploded perspective view of a composite PHC file for an earth retaining wall shown in Fig. 1, Fig. 3 is an exploded perspective view showing a composite PHC pile for an earth retaining wall according to an embodiment of the present invention, FIG. 4 is a partial cross-sectional view of the 'A' portion shown in FIG. 3, and FIG. 5 is a perspective view and a cross-sectional view of the connecting member shown in FIG. 4; 8 is a partially cutaway perspective view showing a configuration of a composite PHC file for an earth retaining wall according to another embodiment of the present invention, and FIG. 9 is a perspective view Fig. 8 is a view for explaining the combination of the synthetic PHC pile for the earth retaining wall and the head reinforcing assembly.

First, referring to FIG. 1 to FIG. 7, a PHC file 100 according to an embodiment of the present invention will be described.

1 to 7, a PHC file 100 according to an embodiment of the present invention includes a plurality of PC steel wires 115, a PHC 100 having a hollow portion 112 extending along the longitudinal direction thereof, A file body 110; A reinforcing bar assembly 120 inserted into the hollow portion 112 of the PHC pile main body 110; The hollow concrete part 111 formed by pouring concrete in a state where the reinforcing steel assembly 120 is inserted into the hollow part 112 and the hollow concrete part 111 formed at the upper end of the PHC pile body 110 are connected to the upper end of the reinforcing steel assembly 110 As shown in FIG.

Referring to FIGS. 1 to 4, the PHC file body 110 is formed by applying a centrifugal force after pouring concrete using a free-tension method. At this time, the PHC file body 110 is formed with a hollow portion 112 extending along the longitudinal direction of the PHC file body 110 by the applied centrifugal force. For reference, the PHC file body 110 is formed in a cylindrical shape extending in the longitudinal direction.

A band band 116 is formed at the upper end of the PHC file body 110. The band band 116 is for preventing the upper end portion, that is, the head portion of the PHC file body 110 from being disturbed, when the earth retaining wall or the bottom surface is constructed.

Meanwhile, a plurality of PC nuts 113 and a PC steel wire 115 are embedded in the PHC file body 110. [

The PC nut 113 and the PC steel wire 115 provide the strength against the compressive force by providing a prestressed force to the PHC pile body 110 to improve the compressive force. The PC nuts 113 and the PC steel wires 115 are provided inside the PHC pile main body 110 at a predetermined interval and are embedded in the PHC pile main body 110 during the concrete curing process. 4, one end of the PC steel wire 115 is provided with a protrusion larger than the diameter of the PC steel wire 115, and the protrusion is inserted and fixed inside the PC nut 113. As shown in FIG.

Referring to FIGS. 1 and 2, the reinforcing steel assembly 120 is inserted into the interior of the PHC pile 110, that is, the hollow portion 112.

At this time, the hollow concrete part 111 formed by pouring the concrete in the state where the reinforcing steel assembly 120 is inserted into the hollow part 112 is formed. That is, the hollow concrete part 111 means that the hollow part 112 formed in the PHC pile main body 110 is filled with concrete.

Referring to FIGS. 1 and 2, the rebar assembly 120 includes a first rebar 122 and a second rebar 124.

The first reinforcing bars 122 are provided in the form of a general reinforcing bar and are arranged at a predetermined interval in the longitudinal direction of the PHC pile main body 110 at regular intervals. The second reinforcing bars 124 are provided in the form of general reinforcing bars in the same manner as the first reinforcing bars 122 and are arranged in plural in the width direction of the PHC pile main body 110 with a predetermined interval therebetween. Here, the second reinforcing bars 124 are installed around the first reinforcing bars 122 to fix the plurality of first reinforcing bars 122. At this time, the second reinforcing bar 124 is wound around the first reinforcing bar 122 through various methods such as arc welding or the like. For reference, the second reinforcing bars 124 may be formed in various shapes such as a circle, a square, and the like instead of being formed in a spiral shape around the first reinforcing bars 122 to bind the plurality of first reinforcing bars 122 together.

As described above, since the first reinforcing bars 122 are provided in the longitudinal direction of the PHC file body 110 and the second reinforcing bars 124 are provided in the lateral direction of the PHC file body 110, The bending moment and the resistance against the compressive force of the bushing 110 can be improved.

1 to 4, the support plate 130 is connected to the upper end of the rebar assembly 120. At this time, the support plate 130 is disposed at the upper end of the PHC pile body 110 in a state where the reinforcing steel assembly 120 is coupled to the lower end thereof.

The support plate 130 is disposed at the upper end of the PHC pile 110 and exposed to the outside of the PHC pile 110. The reinforcing steel assembly 120 is coupled to the lower end of the support plate 130, So that it is located inside the PHC file body 110. That is, since the support plate 130 and the reinforcing bar assembly 120 are structurally integrated, not only the rigidity of the PHC pile 100 can be improved, but also the workability of the PHC pile 100 can be improved. For reference, the rebar assembly 120 is fixedly coupled to the support plate 130 using arc welding, spark welding, or the like.

A through hole 132 is formed in the support plate 130 at a position corresponding to the PC nut 113 embedded in the upper end of the PHC pile body 110. The through holes 132 are formed in a plurality of positions corresponding to at least two, preferably three or more PC nuts 113 among a plurality of PC nuts 113 embedded in the upper end of the PHC pile body 110 A through hole 132 is formed. The through holes 132 are formed at regular intervals along the edge area of the support plate 120.

Although the number of the through holes 132 is shown in FIGS. 1 to 3, the number of the PC nuts 113 to be embedded in the PHC file body 110 or the number of the PC nuts 113 embedded in the PHC file body 110 is not limited thereto. Gt; 10, < / RTI >

A concrete injection port 134 is formed in the support plate 130. The concrete injection port 134 is formed in the hollow portion 112 of the PHC pile main body 110 and the supporting plate 130 in which the reinforcing steel assembly 120 is coupled to the upper end of the PHC pile main body 110 Is a kind of hole for injecting concrete into the hollow portion 112 of the PHC pile main body 110 in a deployed state.

The support plate 130 may be a circular or ring-shaped plate. At this time, the thickness of the support plate 130 is preferably formed in consideration of the length of the connection member 140 because the thickness of the support plate 130 must be connected to the PHC pile body 110 through the connection member 140 to be described later.

It is preferable that the diameter of the support plate 130 is the same as that of the PHC pile main body 110 so as not to protrude from the outer peripheral surface of the PHC pile main body 110. 3, since another PHC file 100 is located on one side of the PHC file 100, when the support plate 130 is protruded from the outer circumferential surface of the PHC file body 110, This is because a gap is generated between adjacent PHC files 100.

1 to 5, the connecting member 140 is fastened to the PC nut 113 embedded in the PHC pile body 110 through the through hole 132 of the support plate 130. In other words, the upper end of the connection member 140 extends through the through hole 132 of the support plate 130 and is exposed to the upper end of the support plate 130, and the lower end of the connection member 140 penetrates through the support plate 130 And is fastened to the PC nut 113 through the hole 132. The connecting member 140 includes a body portion 141 and a head portion 142.

The body portion 141 of the connecting member 140 is inserted through the through hole 132 and is fastened to the PC nut 113. Accordingly, a thread corresponding to the PC nut 113 is formed on the outer circumferential surface of the body portion 141. 4 and 5, a thread is formed only on a part of the body part 141, but a thread may be formed on the entire body part 141. FIG. That is, the body portion 141 of the connecting member 140 means the PC nut fastening portion.

The head 142 of the connecting member 140 extends upward from the body 141 and penetrates the through hole 132 of the support plate 130 while a portion of the head 142 is exposed to the outside of the support plate 130. 3, the head reinforcement assembly 10 is coupled to the head 142 of the connection member 140 exposed to the upper end of the support plate 130. As shown in FIG. That is, the head portion 142 of the connecting member 140 refers to the head reinforcing assembly coupling portion.

On the other hand, a head coupling groove (143) is formed in the head portion (142) of the connecting member (140). The toe engaging groove 143 is inserted into the lower end of the head reinforcement assembly 10 to position the inserted head reinforcement assembly 10. It is necessary to fix the head reinforcing assembly 10 to the PHC pile 100 so that the position of the head reinforcing assembly 10 does not move by using a separate device or the like. However, the connecting member 140 according to an embodiment of the present invention It is not necessary to provide a separate device for holding the head reinforcing assembly 10 coupled to the connecting member 140 as the head coupling groove 143 is formed. The workability can be improved.

Here, since the head reinforcing assembly 10 is formed of a plurality of reinforcing bars in the form of bars having a long shape in the longitudinal direction, the toe engaging groove 143 into which the head reinforcing assembly 10 is inserted is formed to be long in the longitudinal direction . Furthermore, it is preferable that the diameter of the toe coupling groove 143 is formed to be slightly larger or smaller than that of the reinforcing bar constituting the head reinforcing assembly 10 because the reinforcing rod-shaped head reinforcing assembly 10 is inserted.

A height adjusting bolt hole 144 is formed in the head portion 142 of the connecting member 140. In other words, a height adjusting bolt hole 144 is formed in the head portion 142 of the connecting member 140 in a direction intersecting the toe coupling groove 143 formed in the head portion 142. The fixing bolt 150 is inserted into the height adjusting bolt hole 144. At this time, the mounting height of the head reinforcing assembly 10 to the PHC pile 100 can be adjusted according to the fastening depth of the fixing bolt 150.

3 to 6, the head reinforcing assembly 10 is coupled to the head coupling groove 143 of the head 142 exposed to the outside of the support plate 130. As shown in FIG. At this time, the fixing bolt 150 is completely inserted and fastened to the height adjusting bolt hole 144 after adjusting the coupling depth 'h' to the head fitting groove 143 of the head reinforcing assembly 10. Then, when the fixing bolt 150 is completely fastened to the height adjusting bolt hole 144, the fixing bolt 150 pushes the head reinforcing assembly 10 positioned at the height h to be in contact with the head fitting groove 143 The head reinforcement assembly 10 inserted into the toe engaging groove 143 is not moved any more, and the height h is maintained.

Generally, the PHC file 100 according to an embodiment of the present invention is deeply buried in the ground. In addition, a plurality of PHC files 100, that is, at least two PHC files 100, are used instead of one PHC file 100 in construction such as an earth retaining wall, floor, and the like. At this time, the position of the PHC file 100 is changed such that it is positioned lower or higher than the depth initially installed due to the influence of the external environment such as ground condition or underground water, so that a plurality of PHC files 100 ) Are different in height from each other at the top. If the plurality of PHC files 100 are arranged at different heights, there is a risk that problems may occur in construction such as an earth retaining wall, a floor, and the like.

The height of the head reinforcing assembly 10 to be coupled to the upper end of the PHC pile 110 may be adjusted by adjusting the fastening depth of the connecting member 140 and the PC nut 113, By adjusting the installation height of the head reinforcing assembly 10 coupled to the head fitting groove 143 of the connecting member 140 by using the height adjusting bolt hole 144 and the fixing bolt 150 formed on the body 140, The height of the files 100 can be adjusted to be constant.

Referring to FIGS. 6 and 7, a step 146 may be formed in the connecting member 140-1. The step 146 is provided for firmly fixing the support plate 130 disposed at the upper end of the PHC file body 110. When the connection member 140-1 is fastened to the PC nut 113, The support plate 130 is pressed against the upper end of the main body 110. Furthermore, the support plate 130 may be prevented from moving or moving relative to the upper end of the PHC pile body 110.

This step portion 146 is formed on the outer peripheral surface of the head portion 142 of the connecting member 140. [ For example, the step portion 146 may protrude from the outer circumferential surface of the head portion 142 of the connecting member 140 in one side and the other side, or may be formed in the form of a step protruding along the outer circumferential surface of the head portion 142 . The shape and size of the step portion 146 may vary depending on the diameter of the through hole 132 formed in the support plate 130.

Hereinafter, a method of forming the PHC file 100 according to an embodiment of the present invention will be briefly described with reference to FIGS. 1 to 7. FIG.

First, concrete is poured into a mold for manufacturing the PHC file body 110, and centrifugal force is applied to cure the concrete. At this time, the hollow portion 112 is formed by the centrifugal force applied to the PHC file body 110.

Then, the reinforcing bar assembly 120 is inserted into the hollow portion 112. Here, the reinforcing steel assembly 120 is fixedly coupled to the lower end of the support plate 130 by welding. The reinforcing bar assembly 120 fixedly coupled to the support plate 130 is inserted into the hollow portion 112 of the PHC pile main body 110 and the support plate 130 is disposed at the upper end of the PHC pile main body 110 .

Then, the connecting member 140 is fastened to the PC nut 113 through the through-hole 132 formed in the support plate 130. At this time, the connection member 140 may or may not be fastened in a number corresponding to the PC nuts 113 built in the PHC file body 110.

Then, the concrete injection unit 111 is formed by filling the concrete with the reinforcing steel assembly 120 inserted into the hollow part 112 of the PHC file body 110. At this time, the concrete is filled into the hollow portion 112 of the PHC pile main body 110 through the concrete injection port 134 formed in the support plate 130.

For reference, charging of concrete may be performed at the factory that forms the PHC file 100, or may be separately performed at the PHC file body 110 after the PHC file 100 is transferred to the construction site. Specifically, the PHC file body 110 is formed in the factory, and the PHC file body 110 is installed in the PHC file body 110 after the support plate 130, the rebar assembly 120, and the connecting member 140 are installed. The PHC file 100 in which the concrete is filled in the hollow portion 112 of the PHC pile 110 may be transferred to the construction site and only the construction may be performed. The PHC file 100 in which the support plate 130, the reinforcing bar assembly 120 and the connecting member 140 are installed is moved to the construction site and the concrete injection port 134 of the support plate 130 is installed The concrete may be filled with the hollow portion 112 of the PHC file body 110 through the hollow portion 112. [ This is not necessarily limited and may vary depending on the situation of the construction site or the installer of the PHC file 100.

Finally, the top of the formed PHC pile 100, i. E. The head reinforcement assembly 10, is connected. At this time, the lower end of the head reinforcing assembly 10 is coupled to the connecting member 140 through the head insertion groove 143 of the connecting member 140, and is positioned at the upper end of the PHC pile body 110. The mounting height of the head reinforcing assembly 10 may be adjusted by adjusting the fastening depth of the connecting member 140 with respect to the PC nut 113. The height of the head connecting groove 143 And a fixing bolt 150 fastened to the height adjusting bolt hole 144. The height adjusting bolt hole 144 and the height adjusting bolt hole 144 may be formed in the same shape.

The composite PHC pile 100 for an earth retaining wall according to an embodiment of the present invention can be formed by combining the PHC pile 100 and the head reinforcing assembly 10 by using the connecting member 140 It can be facilitated.

The PHC pile 100 for an earth retaining wall of the present invention includes a reinforcing steel assembly 120 inserted into a hollow portion 112 of a PHC pile main body 110, By structurally integrating the plate 130, it is possible to improve the rigidity of the PHC file 100, thereby improving the ease of installation of the PHC file 100.

The PHC pile 100 for the earth retaining wall of the present invention can easily adjust the installation height of the head reinforcing assembly 10 coupled to the PHC pile 100 using the connecting members 140 and 140-1 .

8 and 9, the PHC file 100-1 according to another embodiment of the present invention will be described focusing on the points different from the above-described embodiment.

8 and 9, in the PHC file 100-1 according to another embodiment of the present invention, a plurality of PC steel wires 115 are embedded and a hollow portion 112 extending along the longitudinal direction is formed A reinforcing bar assembly 120 inserted into the hollow portion 112 of the PHC file body 110 and a reinforcing bar assembly 120 inserted into the hollow portion 112. [ And a connection member 140 coupled to the PC nut 113 embedded in the upper end of the PHC pile main body 110 and connected to the head reinforcing assembly.

The structure of the PHC file body 110, the reinforcing steel assembly 120, the hollow concrete part 111, and the connecting member 140 of the PHC file 100-1 according to another embodiment of the present invention is the same as that of the above- The same components are denoted by the same names and reference numerals, and the description thereof will be applied to the embodiments described above.

8 and 9, the PHC file 100-1 according to another embodiment of the present invention uses only the rebar assembly 120 different from the PCH file 100 according to the above- And inserted into the hollow portion 112 of the PHC file body 110. [

At this time, it is preferable that the reinforcing bar assembly 120 alone is not exposed to the outside or protruded from the PHC pile body 110 even if the reinforcing bar assembly 120 is inserted into the hollow portion 112 of the PHC pile body 110. This is because the head reinforcing assembly 10 is coupled with the PHC file 100-1 through the connecting member 140 in the case of the PHC file 100-1 so that the reinforcing bar assembly 120 is connected to the PHC file body 110 , It may be difficult for the head restraining assembly 10 to engage with the connecting member 140. In this case,

Referring to FIGS. 8 and 9, the connecting member 140 includes a body portion 141 and a head portion 142. The body portion 141 of the connecting member 140 is threaded on the outer circumferential surface and is directly fastened to the PC nut 113. The head portion 142 of the connecting member 140 extends upward from the body portion 141 The lower end of the head restraint assembly 10 is engaged. At this time, the connecting member 140 is connected to the remaining part of the body part 141 and the head part of the connecting member 140, except for the part of the body part 141 that is the body part 141 fastened to the PC nut 113. [ (142) is exposed outside the PHC file body (110).

Here, a head coupling groove 143 is formed in the head portion 142 of the connecting member 140. In other words, the head reinforcement assembly 10 is engaged with the coupling member 140 through the head coupling groove 143 formed in the head 142 exposed to the outside of the PHC pile main body 110. The toe coupling grooves 143 may be formed by positioning the inserted head reinforcing assembly 10 such that the head reinforcing assembly 10 coupled with the coupling member 140 is shaken or the PHC pile 100-1 is joined to the head reinforcing assembly 10 ) To prevent it from falling out.

A height adjusting bolt hole 144 is formed in the head 141 of the connecting member 140 and a fixing bolt 150 is inserted in a direction intersecting the height adjusting bolt hole 144. The head reinforcing assembly 10 inserted into the head engaging groove 143 formed in the head portion 142 of the connecting member 140 by the fixing bolt 150 inserted through the height adjusting bolt hole 144 is further bent You can get it.

The mounting height of the head reinforcing assembly 10 is adjusted according to the fastening depth of the body portion 141 of the connecting member 140 with respect to the connecting member 140 and the PC nut 113, . For example, when the PHC file 100-1 is installed at a depth much lower than the ground, the body portion 141 of the connecting member 140 with respect to the PC nut 113 is prevented from being deeply coupled, The PHC pile 100-1 may be attached to the PHC pile 100-1 by closely fitting the body portion 141 of the connecting member 140 to the PC nut 113, Adjust the installation height. For reference, the height adjusting bolt hole 144 and the fixing bolt 150 may be used to adjust the installation height of the head reinforcing assembly 10. [

The composite PHC pile 100-1 for the earth retaining wall according to another embodiment of the present invention can be formed by combining the PHC pile 100-1 and the head reinforcing assembly 10 by using the connecting member 140 It can be facilitated.

The PHC pile 100-1 for the earth retaining wall of the present invention can easily adjust the installation height of the head reinforcing assembly 10 coupled to the PHC file 100-1 by using the connecting member 140. [

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the claims set forth below, fall within the scope of the present invention.

10: head reinforcement assembly
100, 100-1: Synthetic PHC file for earth retaining walls
110: PHC file body 111: concrete injection hole
112: hollow part 116: PC nut
115: PC steel wire 116: Band band
120: reinforcing steel assembly 122: first reinforcing steel
124: second rebar 130: support plate
132: Through hole 134: Concrete injection hole
140, 140-1: connecting member 141: head portion
142: body portion 143: head coupling groove
144: height adjusting bolt hole 146:
150: Fixing bolt

Claims (12)

In the PHC file used for the earth retaining wall construction,
A PHC file body having a plurality of PC steel wires embedded therein and a hollow portion extending along the longitudinal direction thereof;
A reinforcing steel assembly inserted into the hollow portion of the PHC pile main body;
A hollow concrete part formed by pouring concrete in a state where the reinforcing steel assembly is inserted into the hollow part; And
A support plate connected to an upper end of the rebar assembly and disposed at an upper end of the PHC pile body;
Lt; RTI ID = 0.0 > PHC < / RTI >
The method according to claim 1,
Wherein the reinforcing bar assembly is inserted into the hollow portion with the upper end thereof coupled to the support plate.
3. The method of claim 2,
Wherein the support plate is formed with a concrete injection port for pouring concrete into the hollow portion.
The method according to claim 1,
Wherein the support plate has a plurality of through holes at positions corresponding to at least two of a plurality of PC nuts embedded in the upper end of the PHC pile body,
And a connecting member inserted through the through hole and fastened to the PC nut.
5. The method of claim 4,
The connecting member includes:
A body portion inserted through the through hole and fastened to the PC nut; And
And a head portion extending upward from the body portion and exposed to the outside of the support plate and engaged with the head reinforcement assembly.
6. The method of claim 5,
The connecting member includes:
And a head coupling groove into which the lower end of the head reinforcement assembly is inserted is formed on the head to position the head reinforcement assembly.
6. The method of claim 5,
Wherein the installation height of the head reinforcement assembly is adjusted according to the fastening depth of the connecting member and the PC nut.
6. The method of claim 5,
The connecting member includes:
A bolt hole for height adjustment is formed in the head portion in a direction of replacing the toe coupling groove and a fixing bolt is inserted and tightened through the height adjusting bolt hole in a state where a lower end portion of the head reinforcement assembly is inserted into the toe coupling groove Wherein a height of the lower end of the head reinforcement assembly is fixed to adjust a height of the head reinforcement assembly.
5. The method of claim 4,
The connecting member includes:
And a step for pressing the support plate against the upper end of the PHC pile body in a state where the support plate is fastened to the PC nut so that the support plate is firmly fixed to the upper end of the PHC pile body. .
In the PHC file used for the earth retaining wall construction,
A PHC file body having a plurality of PC steel wires embedded therein and a hollow portion extending along the longitudinal direction thereof;
A reinforcing steel assembly inserted into the hollow portion of the PHC pile main body;
A hollow concrete part formed by pouring concrete in a state where the reinforcing steel assembly is inserted into the hollow part; And
A connecting member fastened to the PC nut embedded in the upper end of the PHC pile body and connected to the head reinforcing assembly;
Lt; RTI ID = 0.0 > PHC < / RTI >
11. The method of claim 10,
The connecting member includes:
A body portion which is fastened to the PC nut; And
And a head portion extending upward from the body portion and coupled to a lower end portion of the head reinforcement assembly.
12. The method of claim 11,
Wherein the coupling member includes a head coupling groove in which a lower end portion of the head reinforcement assembly is inserted into the head portion to position the head reinforcement assembly,
Wherein the installation height of the head reinforcement assembly is adjusted according to the fastening depth of the connecting member and the PC nut.

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