KR102351779B1 - Phc pile for soil retaining wall - Google Patents

Abstract

The PHC pile for retaining wall according to an embodiment of the present invention relates to a PHC file used for the construction of a retaining wall, and the pile body in which a plurality of PC steel wires are embedded, the pile so that the nut hole part is exposed on the surface of the pile body An insert nut member installed to be embedded in the concrete constituting the body, is connected to the insert nut member and installed to be embedded in the concrete together with the insert nut member. Resistance to the pulling force acting on the insert nut member after construction of the PHC pile and an insert reinforcing member supporting the insert nut member to do so.

Description

PHC pile for retaining wall {PHC PILE FOR SOIL RETAINING WALL}

The present invention relates to a PHC pile for a retaining wall, and more particularly, to a PHC file for a retaining wall, which can prevent damage by reinforcing the strength of the PHC pile, and can stably install a wale on a plurality of PHC piles. .

When the foundation of a building or civil engineering structure is placed on a soft ground, a pile, which is a deep foundation, is buried up to the support layer to secure bearing capacity and stabilize the foundation. The types of piles as described above are very diverse according to materials such as wood, steel, and concrete. In addition, the piles are installed by various construction methods such as driving, driving after excavation, and the like.

On the other hand, the retaining method is classified in various ways according to the type of retaining wall for maintaining the independence of the soil at the back and the type of support (bracing) for structurally supporting it.

The currently widely used retaining walls include H-beam steel + earth pipe (wood), sheet pile, cast in place concrete pile (CIP), and cast-in-place soil cement retaining wall (SCW: Soil Cement Wall). ), underground continuous walls (Diaphragm Wall, Slurry Wall), and the like.

H-beam steel + earth plate is installed where groundwater does not exist, and the rest of the construction methods are used where groundwater exists. For the retaining wall composed of H-beam steel + earth plate, the ground is drilled using auger equipment, and H-beam steel is installed along the excavation surface boundary at predetermined intervals. As a wall method, wood is mainly used for earth plates.

The steel pile pile is a method of forming a temporary retaining wall by continuously installing sheet pile sections into the ground with a vibrating hammer drill so that they bite each other.

For cast-in-place concrete piles (CIP), the ground is drilled using auger equipment, and H-beams are drilled along the excavation surface boundary at predetermined intervals, drilled in the same way in between, and assembled and inserted with a reinforcing bar network. It is a construction method that forms temporary walls by making piles by pouring cement mortar or concrete on site.

Cast-heated soil-cement retaining wall (SCW) uses a triaxial auger equipment to drill three holes in the ground and at the same time add and stir cement mortar to form a soil-cement mixed pile in the ground, and put H-beam steel in one hole It is a construction method that forms a temporary retaining wall by inserting at intervals and repeatedly constructing it so that it is bitten one by one.

In order to prevent excavation surface collapse and groundwater penetration, the ground of the wall part is excavated while injecting stabilizing liquid (bentonite), and the reinforced concrete continuous wall is formed in the ground by inserting the assembled reinforcing bar network and then pouring concrete. it's a technique

The retaining wall as described above is a temporary structure constructed for the purpose of resisting lateral pressure such as earth pressure and water pressure during underground excavation construction for the purpose of constructing an underground structure, and for the purpose of subsidence of the surrounding ground and protection of adjacent structures. Retaining walls are being constructed for the purpose of subsidence of the surrounding ground or building protection as excavation works in downtown areas have become more frequent in recent years.

On the other hand, among various types of piles, wood and precast concrete piles (PC piles) have low economic efficiency and workability, so PHC piles (Prestressed High-strength Concrete pile) having relatively excellent workability and stability are used a lot. In particular, PHC piles are high-strength concrete piles for construction, and are widely used in buildings and civil structures that mainly support vertical forces with little horizontal force.

For example, in Korean Patent No. 10-0913569 (title of invention: PHC file for retaining wall, registration date: August 17, 2009), PHC that can easily construct a continuous retaining wall by changing the shape and structure of the cross section A technology related to a file is disclosed.

For reference, recently, when using PHC piles, composite piles or composite piles are frequently used in order to overcome the small horizontal resistance of PHC piles. The composite pile has a structure combining both with a steel plate applied to the upper part where bending and shearing sectional forces are large, and a PHC pile applied to the lower part where only axial force is applied. Composite pile is a structure in which bending and shearing are reinforced by reinforcing reinforcing bars and filling concrete after the pile is manufactured with the shear connector installed inside the upper part of the PHC pile.

As described above, a lot of PHC piles are used in carrying out the retaining wall construction work, and the PHC piles are constructed in a structure in which a plurality of PHC piles located adjacent to each other using a wale are connected with a wale. In recent years, various attempts have been made to develop a technology for making the installation structure of the wale or wale bracket more robust and stable as well as the convenient installation of the wale or wale bracket.

An embodiment of the present invention provides a PHC pile for a retaining wall that can stably use a high-load wale by installing a wale or a wale bracket in a plurality of PHC piles forming a retaining wall.

In addition, an embodiment of the present invention provides a PHC pile for a retaining wall that can easily install a wale or wale bracket to the insert nut member embedded in the PHC pile, and can stably support the pulling force applied to the insert nut member. .

In addition, an embodiment of the present invention provides a PHC pile for a retaining wall, which can significantly reinforce the strength of the PHC pile only by a simple structural change and a small addition of cost.

According to an embodiment of the present invention, it relates to a PHC pile used for the construction of a retaining wall, and the PHC file for a retaining wall according to an embodiment of the present invention is a pile body in which a plurality of PC steel wires are embedded, the pile body The insert nut member installed to be embedded in the concrete constituting the pile body so that the nut hole part is exposed on the surface of the, is connected to the insert nut member and installed to be embedded in the concrete together with the insert nut member after construction of the PHC pile and an insert reinforcing member supporting the insert nut member to resist a pulling force acting on the insert nut member.

Preferably, the insert reinforcing member may be provided to support the insert nut member by being caught by at least one first PC steel wire disposed adjacent to the insert nut member among the PC steel wires.

Here, the PC steel wires are arranged long in the longitudinal direction of the pile body, and may be disposed to be spaced apart from each other along the circumferential direction of the pile body. The insert nut member may be disposed between the PC steel wires.

The insert reinforcing member may be disposed on the inner side in the radial direction of the pile body than the first PC steel wires disposed adjacent to both sides of the insert nut member, and both ends extend longer and the first PC steel wires and can be crossed.

In addition, the nut hole portion may be formed at one end of the insert nut member, and the insert reinforcing member may be connected to the other end of the insert nut member. The insert reinforcing member as described above may be provided in a bar shape or a rod shape in which both ends are longer than the spacing between the first PC steel wires.

A portion between both ends of the insert reinforcing member may be connected by welding or fastening to the other end of the insert nut member, or may be connected in a manner that is fitted into an assembly hole formed through the other end of the insert nut member.

Preferably, the PHC pile for retaining wall according to an embodiment of the present invention is installed to be embedded in the concrete together with the insert nut member, and the insert nut member is transmitted to the first PC steel wire by the insert reinforcing member It may further include a steel wire connecting member for connecting the first PC steel wire and other PC steel wire to support the dispersion of the pulling force.

Here, the steel wire connecting member may be provided to connect the first PC steel wire and the second PC steel wire adjacent to the first PC steel wire. A first connecting ring for connecting to the first PC steel wire may be provided at one end of the steel wire connecting member, and a second connecting ring portion for connecting to the second PC steel wire is provided at the other end of the steel wire connecting member can be

In addition, the first connecting ring portion and the second connecting ring portion may be formed in a structure in which both ends of the steel wire connecting member are bent so that they can be respectively hung on the first PC steel wire or the second PC steel wire.

The steel wire connecting member may bend any one of the first connecting ring portion or the second connecting ring portion to a first length for the convenience of assembly with the first PC steel wire and the second PC steel wire, and the The other one of the first connecting ring portion or the second connecting ring portion may be bent to a second length shorter than the first length.

In the PHC pile for retaining wall according to an embodiment of the present invention, a wale or wale bracket can be installed very simply by using an insert nut member embedded in a plurality of PHC piles forming a retaining wall, and insert reinforcement provided in the insert nut member By reinforcing the insert nut member, the member can firmly and stably support the wale or wale bracket.

In addition, since the PHC pile for retaining wall according to the embodiment of the present invention has a structure embedded in the concrete constituting the pile body after connecting the insert reinforcement member to the insert nut member, the bonding force between the insert nut member and the pile body is further increased. By improving it, it is possible to prevent the insert nut member from being pulled out abnormally from the pile body.

In addition, in the PHC pile for retaining wall according to the embodiment of the present invention, the insert nut member and the insert reinforcement member are embedded in the concrete constituting the pile body, and the insert reinforcement member is disposed adjacent to both sides of the insert nut member. 1 Because the structure is applied to the PC steel wires, the pulling force applied to the insert nut member can be supported more stably, and the load that the insert nut member can support increases, so the arrangement structure of the insert nut member can be implemented very stably .

In addition, the PHC pile for retaining wall according to an embodiment of the present invention connects the first PC steel wire disposed adjacent to both sides of the insert nut member and the second PC steel wire disposed adjacent to the first PC steel wire with a steel wire connecting member. Since it is a single structure, the second PC steel wire connected to the steel wire connection member can support the pulling force applied to the insert nut member together, and thereby increase the pulling force applied to the insert nut member, thereby providing a high-load wale on a plurality of PHC piles. can be applied.

In addition, the PHC pile for retaining wall according to the embodiment of the present invention is a structure in which the insert reinforcement member is connected to the insert nut member and the steel wire connection member is connected to the first PC steel wire and the second PC steel wire, so the insert reinforcement member Structural strength of PHC piles can be easily reinforced with a simple operation of installing a steel wire connecting member with a PHC pile, and the reinforcement structure of PHC piles can be implemented very robustly at low cost.

1 is a perspective view showing a retaining wall using a PHC pile for retaining wall according to an embodiment of the present invention.
Figure 2 is a view showing the PHC file for retaining wall shown in Figure 1.
FIG. 3 is a view showing a cross section taken along line AA shown in FIG. 2 .
FIG. 4 is a view showing the insert nut member and the insert reinforcing member shown in FIG. 3 .
FIG. 5 is a view showing another example of the insert nut member and the insert reinforcing member shown in FIG. 3 .
6 is a view showing the steel wire connecting member shown in FIG.
7 is a view showing the arrangement structure of the main configuration of the PHC pile for retaining wall shown in FIG. 3 .
8 and 9 are views showing another example of the arrangement structure for the main configuration of the PHC pile for the retaining wall shown in FIG. 3 .
10 is a reference diagram for explaining a method of manufacturing a PHC pile for a retaining wall according to an embodiment of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the examples. Like reference numerals in each figure indicate like elements.

1 is a perspective view showing a retaining wall 10 using the PHC pile 100 for retaining wall according to an embodiment of the present invention, and FIG. 2 is a PHC file 100 for the retaining wall shown in FIG. It is a drawing, and FIG. 3 is a view showing a cross section taken along line AA shown in FIG. 2 . FIG. 4 is a view showing the insert nut member 120 and the insert reinforcing member 130 shown in FIG. 3 , and FIG. 5 is another example of the insert nut member 120 and the insert reinforcing member 130 shown in FIG. 3 . , and FIG. 6 is a view showing the steel wire connecting member 140 shown in FIG. 3 . 7 is a view showing the arrangement structure of the main configuration of the PHC pile 100 for the retaining wall shown in FIG. 3, and FIGS. 8 and 9 are the main configuration of the PHC pile 100 for the retaining wall shown in FIG. It is a diagram showing another example of the arrangement structure for 10 is a reference diagram for explaining a method of manufacturing the PHC pile 100 for retaining wall according to an embodiment of the present invention.

Referring to FIG. 1 , a PHC pile 100 for a retaining wall according to an embodiment of the present invention may be used for construction of a retaining wall 10 .

In general, the retaining wall 10 may include the PHC pile 100 for the retaining wall, the wale 20, and the wale bracket 30 .

Here, a plurality of PHC piles 100 for retaining walls of the present embodiment may be installed at predetermined intervals in the ground (not shown). As described above, the number of PHC piles 100 installed in the ground may vary depending on the size of the retaining wall 10 to be created.

A plurality of PHC piles 100 may be installed in a line along a desired boundary of the ground. In this case, the PHC file 100 may be disposed to be spaced apart from each other at a predetermined interval from other PHC files 100 adjacent to each other.

In addition, the wale 20 may be installed in a horizontal direction at an appropriate height of the plurality of PHC piles 100 . Accordingly, the plurality of PHC piles 100 are bound to each other by the wale 20 and may be stably disposed on the ground.

The wale 20 as described above may be directly installed as a fastening member (not shown) to the plurality of PHC piles 100 , but in this embodiment the wale 20 is a wale bracket disposed in the plurality of PHC piles 100 . It will be described as being installed in (30). That is, the band 20 may be connected to the plurality of PHC piles 100 via the band band bracket 30 .

In addition, the wale bracket 30 may be respectively installed in a plurality of PHC piles 100 connected by the wale 20 . The wadding bracket 30 as described above may be all individually arranged in the plurality of PHC piles 100 , but in this embodiment, the wale band bracket 30 is selectively arranged for every predetermined number of the plurality of PHC piles 100 . It is possible to prevent a serious increase in the number of use and installation work of the wadding bracket 30 .

The wale 20 is a member performing a beam function arranged horizontally in the horizontal direction, and the wale bracket 30 is a member performing a beam hanging function to support the wale 20. The wale bracket 30 as described above may be formed in various structures for supporting the wale belt 20 in the form of a beam, but a detailed description thereof will be omitted in this embodiment.

The band-length bracket 30 may be very firmly fixed by welding while in close contact with the nut hole 122 of the insert nut member 120 to be described later. Therefore, the band belt bracket 30 can support the high load band belt 20 very stably. In particular, in recent years, among the construction methods of the retaining wall 10, there is an increasing number of cases in which the high load wale 20 must be applied. Therefore, in this embodiment, by reinforcing the strength of the insert nut member 120 to which the wale 20 or the wale bracket 30 is fastened by the fastening member, the wale 20 or the wale bracket 30 of a high load is sufficiently stable. can be supported by

Hereinafter, the configuration and effect of the PHC pile 100 for retaining wall according to the present embodiment will be described in detail.

1 to 3, the PHC pile 100 for retaining wall according to an embodiment of the present invention, the pile body 110, the insert nut member 120, the insert reinforcement member 130, and the steel wire connection A member 140 may be included.

Here, the pile body 110 may be made of a concrete material, and the insert nut member 120, the insert reinforcing member 130, and the steel wire connecting member 140 may be made of a material having excellent strength, such as a metal material. . However, the present invention is not limited thereto, and depending on the design conditions and circumstances of the PHC pile 100 for retaining wall, a part of the pile body 10 may be formed of a metal material or a reinforcement structure may be added to a part of the pile body 10 . have.

In addition, the PHC pile 100 for the retaining wall of this embodiment can be fastened to the wale 20 or the wale bracket 30 by using a fastening member to the insert reinforcement member 130 . It is also possible that a plurality of the wale 20 or the wale bracket 30 as described above are installed in the PHC pile 100 for the retaining wall, if necessary.

1 to 3 , the pile body 110 of this embodiment may be formed to have a long cylindrical shape with a hollow inside. The pile body 110 as described above may form a retaining wall 10 by arranging a plurality of them to be spaced apart from each other at regular intervals on the ground.

Since the pile body 110 is manufactured in the shape of a column formed of a concrete material, the resistance to the compressive force applied vertically is very good, but the resistance to the horizontal force applied horizontally may be relatively weak. Therefore, it is possible to increase the resistance to the horizontal force of the pile body 110 by embedding a metal material having a very excellent resistance to horizontal force than a concrete material inside the pile body 110 .

For example, the pile body 110 may include a concrete pile body 112 , a PC steel wire 114 , and a band band 116 .

The concrete pile body 112 is a cylindrical member formed of a concrete material, and a hollow portion 112a may be formed inside the concrete pile body 112 in the longitudinal direction. The hollow part (112a) may be formed in a shape penetrating the center of the concrete pile body (112) in the longitudinal direction.

The PC steel wire 114 is a member for reinforcing resistance to the horizontal force applied to the concrete pile body 112 , and may be disposed in a structure embedded in the concrete pile body 112 . In particular, the PC steel wire 114 can provide prestress to the concrete pile body 112 by installing it embedded in the concrete pile body 112 in a tensioned state, and accordingly, the pile body 110 to the tensile stress of the pile body 110 . strength can be reinforced.

PC steel wire 114 may be disposed long in the longitudinal direction of the concrete pile body 112, a plurality of them along the circumference of the concrete pile body 112 may be disposed to be spaced apart from each other. An iron wire (not shown) may be fixed by welding while spirally wound to the plurality of PC steel wires 114 as described above.

The band band 116 is a member provided at the upper end of the concrete pile body 112 , and may be formed in a band shape or a band shape of a metal material to finish the upper end of the pile body 110 .

1 to 5 , the insert nut member 120 of this embodiment may be installed to be embedded in the concrete constituting the pile body 110 so that the nut hole 122 is exposed on the surface of the pile body 110 . have. The insert nut member 120 may be respectively disposed in a structure embedded in one side of the concrete pile body 112 . As an example, by pouring and curing concrete in a state in which the plurality of insert nut members 120 are previously disposed inside the PHC pile mold, the pile body 110 is configured to convert the plurality of insert nut members 120 into the concrete pile body 112 . ) can be manufactured in a buried state.

The insert nut member 120 is disposed in any one of the spaces formed between the PC steel wires 114 disposed along the circumferential direction of the pile body 110 , along the longitudinal direction of the pile body 100 . A plurality may be disposed to be spaced apart. That is, a plurality of nut hole portions 122 of the insert nut member 120 may be arranged in a line along the longitudinal direction of the pile body 110 on the surface of one side of the concrete pile body 112 .

Here, a nut hole 122 may be formed at one end of the insert nut member 120 . The inside of the nut hole part 122 as described above may be provided with a female screw for screwing with a bolt-shaped fastening member. That is, the fastening member may be formed in a bolt structure having a male screw portion, and the nut hole portion 122 of the insert nut member 120 may be formed in a nut structure having a female screw portion fastened to the male screw portion of the fastening member.

In addition, the insert reinforcing member 130 may be connected to the other end of the insert nut member 120 . That is, in the present embodiment, the other end of the insert nut member 120 is formed in a closed structure and may be disposed to be completely embedded in the concrete pile body 112 . A reinforcing member connecting portion 124 for connecting the insert reinforcing member 130 may be provided at the other end of the insert nut member 120 as described above. Hereinafter, it will be described that the reinforcing member connecting portion 124 is connected to the insert reinforcing member 130 by welding in this embodiment.

3 to 5 and 7, the insert reinforcement member 130 of this embodiment is for reinforcing resistance against the pulling force acting on the insert nut member 120 after construction of the PHC pile 100 for retaining wall As a member, the pull-out force applied to the insert nut member 120 by the load of the belt belt 20 or the belt belt bracket 30 may be stably supported. The insert reinforcing member 130 may be connected to the insert nut member 120 , and may be installed to be embedded in the concrete pile body 112 in a state connected to the insert nut member 120 .

That is, since the insert reinforcing member 130 is embedded in the concrete pile body 112 together with the insert nut member 120, the insert nut member 120 alone is embedded with the concrete pile body 112 than when the insert nut member 120 is embedded alone. The binding force may be increased. In addition, the insert reinforcing member 130 is caught on the first PC steel wires 114a and 114b disposed adjacent to the insert nut member 120 among the PC steel wires 114 when a pulling force is applied to the insert nut member 120 . Since it is a fixed structure, it is possible to prevent the insert nut member 120 from coming out of the concrete pile body 112 .

Here, the insert reinforcing member 130 may be disposed on the inner side in the radial direction of the pile body 110 than the first PC steel wires 114a and 114b disposed adjacent to both sides of the insert nut member 120 . That is, the insert reinforcing member 130 may interfere with the first PC steel wires 114a and 114b in the direction in which the pull-out force of the insert nut member 120 is applied, and the first PC steel wires 114a and 114b Interference with Thus, the pulling force of the insert nut member 120 may be stably supported.

In addition, a reinforcing member connecting portion 124 connected to the other end of the insert nut member 120 may be connected to a portion between both ends of the insert reinforcing member 130 . At this time, both ends of the insert reinforcing member 130, the first PC steel wire (114a, 114b) to be caught by the pulling force applied to the insert nut member 120 when intersected with the first PC steel wires (114a, 114b) can be extended in the left and right directions.

On the other hand, the insert reinforcing member 130 may be provided in any one shape of a bar or a rod in which the length L1 in the left and right direction is longer than the spacing G of the first PC steel wires 114a and 114b. A portion between both ends of the insert reinforcing member 130 as described above is a welding method to the reinforcing member connection portion 124 of the insert nut member 120, a fastening method using a fastening member such as a bolt and a rivet, or an insert nut member 120 ) and can be connected in such a way that it is inserted and assembled.

3 and 4 , in this embodiment, the insert reinforcing member 130 is provided as a bar-shaped flat iron member formed with a thin thickness and is welded to the reinforcing member connection portion 124 of the insert reinforcing member 130 in a welding method. can be firmly connected to Accordingly, the insert nut member 120 and the insert reinforcing member 130 may be used as one component in a state of being welded to each other.

Unlike the above, another example of the insert nut member 120 and the insert reinforcing member 130 is shown in FIG. 5 . For example, as shown in FIG. 5 , the reinforcing member connection part 124 of the insert nut member 120 may be provided with an assembly hole 126 penetrating in the left and right directions. In addition, the insert reinforcing member 132 may be provided in the shape of a rod to be inserted through the assembly hole 126 . The insert reinforcing member 132 may be connected in such a way that it is fitted into the assembly hole 126 . Therefore, the insert nut member 120 and the insert reinforcing member 132 may be assembled and used by a worker at the manufacturing site of the PHC pile 100 for retaining wall, if necessary. In this case, both ends of the insert reinforcing member 130 may be bent in a shape that wraps around the first PC steel wires 114a and 114b.

On the other hand, when the PHC pile 100 for the retaining wall is used for general facilities in a general field, only the insert nut member 120 and the insert reinforcing member 130 can sufficiently resist the pulling force acting on the insert nut member 120. However, when the PHC pile 100 for retaining wall is used for large facilities such as top-down sites, it more stably resists the pulling force applied to the insert nut member 120 because the large wale 20 of high load is used. An additional reinforcement structure is required to do this. Therefore, in order to smoothly use the large wale 20 of high load at the top-down site, it is preferable to additionally install the lower steel wire connecting member 140 .

3 to 9, the steel wire connection member 140 of this embodiment is the insert nut member 120 that is transmitted to the first PC steel wire 114a, 114b by the insert reinforcing member 130 to remove the pulling force. 1 PC steel wire (114a, 114b) and adjacent to the other PC steel wire (114c, 114d) is a member for supporting dispersedly. The steel wire connection member 140 may be installed to be embedded in the concrete pile body 112 together with the insert nut member 120 and the insert reinforcement member 130 . The steel wire connecting member 140 as described above has a structure in which the first PC steel wires 114a and 114b are connected to the first PC steel wires 114a and 114b and other second PC steel wires 114c and 114d disposed adjacent to each other. can be

That is, one end of the steel wire connecting member 140 is provided with a first connecting ring 142 for connecting to the first PC steel wires 114a and 114b, and the other end of the steel wire connecting member 140 is provided with a second PC. A second connection ring portion 144 for connecting to the steel wire (114c, 114d) may be provided.

Here, the first connection ring portion 142 and the second connection ring portion 144 is a first connection in a state in which any one of the first connection ring portion 142 or the second connection ring portion 144 is connected first. The ring portion 142 or the second connection ring portion 144 may be provided to connect or separate the other one. Hereinafter, in this embodiment, by rotating the steel wire connecting member 140 in a state in which the second connecting ring portion 144 is connected to the second PC steel wire (114c, 114d), the first connecting ring portion 142 is connected to the first PC It will be described as connecting or separating the steel wires (114a, 114b).

And, the steel wire connection member 140 is a bar or bar formed with a length L2 in the left and right direction longer than the spacing G of the first PC steel wire 114a, 114b and the second PC steel wire 114c, 114d. It may be provided in any one shape. At this time, the first connecting ring portion 142 or the second connecting ring portion 144 is a first PC steel wire (114a, 114b) or a second PC steel wire ( It may be formed in a structure that can be hung on 114c and 114d).

On the other hand, in the present embodiment, the steel wire connecting member 140 is the first connecting ring portion 142 and the first connecting ring portion 142 to increase the assembly convenience with the first PC steel wire (114a, 114b) and the second PC steel wire (114c, 114d). Two connecting ring portions 144 may be bent to different lengths. At this time, the second connection ring portion 144 may be bent to a first length (B1) to the second PC steel wire (114c, 114d), the first connection ring portion 142 is the first PC steel wire (114a, 114b) ) may be bent to a second length B2 shorter than the first length B1.

3 and 7, in the present embodiment, the steel wire connecting member 140 is a first PC steel wire (114a, 114b) and a second PC disposed adjacent to each side on both sides of the insert nut member 120, respectively. Although described as being disposed one by one on the steel wires 114c and 114d, the present invention is not limited thereto, and the arrangement structure of the steel wire connection member 140 may be variously changed.

As an example, another example in which the steel wire connecting member 140 is disposed is shown in FIGS. 8 and 9 , respectively.

As shown in Figure 8, the steel wire connecting member 140 is a plurality of first PC steel wire (114a, 114b) and second PC steel wire (114c, 114d) disposed adjacent to each side on both sides of the insert nut member 120, respectively. may be placed. At this time, the steel wire connection members 140, the first PC steel wire (114a, 114b) and the second PC steel wire (114c, 114d) may be disposed to be spaced apart in the longitudinal direction of the pile body 110, the insert reinforcement member ( 130) and the first PC steel wire (114a, 114b) may be disposed to be adjacent to the connection portion. Accordingly, the pull-out force of the insert nut member 120 transmitted through the insert reinforcing member 130 is dispersed by the plurality of steel wire connecting members 140 to the first PC steel wire 114a, 114b and the second PC steel wire 114c. , 114d) can be supported at multiple positions.

As shown in FIG. 9 , the steel wire connection member 140 is disposed adjacent to both sides of the insert nut member 120 , respectively, one for each of the first PC steel wires 114a and 114b and the second PC steel wires 114c and 114d. a second PC steel wire ( 114c, 114d) and the third PC steel wire 114 may also be arranged one by one. Accordingly, the pulling force of the insert nut member 120 transmitted through the insert reinforcing member 130 is applied to the first PC steel wires 114a and 114b and the second PC steel wires 114c and 114d and the third PC steel wire 114 . can be supported more stably.

The construction process of the retaining wall 10 using the PHC pile 100 for retaining wall according to an embodiment of the present invention configured as described above and the manufacturing method of the PHC file 100 for retaining wall will be described as follows.

First, a process of constructing the retaining wall 10 using the PHC pile 100 for the retaining wall according to the present embodiment will be described.

A plurality of PHC piles 100 are installed at predetermined intervals with respect to the ground, and excavation work is performed on the ground. The excavation work is carried out on one side of the PHC pile 100 where earth pressure is not applied.

Then, the wale bracket 30 is installed in the plurality of PHC piles 100 , and the wale 20 is installed in the wale bracket 30 to stably bind and support the plurality of PHC piles 100 . The wale bracket 30 and the wale belt 20 are sequentially installed at a predetermined height in the plurality of PHC piles 100 as the excavation construction progresses.

Looking at the installation process of the wale bracket 30, using a fastening member fastened to the nut hole 122 of the insert nut member 120 exposed on the surface of the pile body 110 of the PHC pile 100, 30) is fixed to the insert nut member 120 .

As described above, when the belt belt 30 is fixed to the insert nut member 120 , the belt belt 20 is installed on the belt belt bracket 30 .

At this time, the load of the belt belt 20 and the belt belt bracket 30 is applied to the insert nut member 120 through the fastening member, the load of the belt belt 20 and the belt belt bracket 30 is the insert nut member 120 It acts as a pulling force.

On the other hand, the pulling force of the insert nut member 120 acts in a direction to pull the insert nut member 120 from the pile body 110 , but the insert reinforcement member 130 connected to the insert nut member 120 is the pile body 110 . Because it is embedded in the concrete pile body 112 of the insert nut member 120 to increase the resistance to the pulling force, in particular, both ends of the insert reinforcement member 130 are adjacent to both sides of the insert nut member 120 first It is caught on the PC steel wires 114a and 114b to resist the pulling force of the insert nut member 120 .

Accordingly, the insert nut member 120, the insert reinforcing member 130, and the first PC steel wires 114a and 114b sufficiently support the pulling force applied to the insert nut member 120 to prevent the insert nut member 120 from being pulled out. can be prevented

Meanwhile, in a general field, only the insert nut member 120 and the insert reinforcing member 130 for general temporary facilities can sufficiently resist the pulling force applied to the insert nut member 120 . However, when used for large facilities such as top-down sites, a reinforcing structure is additionally required to more stably resist the pulling force of the insert nut member 120 in order to stably support the large wale 20 of high load.

That is, in order to smoothly use the large wale 20 of high load at the top-down site, etc., the steel wire connection member 140 is additionally installed in the first PC steel wires 114a and 114b and the second PC steel wires 114c and 114d. Thus, the load applied to the first PC steel wires 114a and 114b is dispersed in the second PC steel wires 114c and 114d to increase the allowable pull-out force of the insert nut member 120 . Therefore, due to the installation of the steel wire connecting member 140, it may be possible to use the high-load wale 20 or the wale bracket 30.

As shown in FIG. 10 , a method of manufacturing the PHC pile 100 for retaining wall according to the present embodiment will be briefly described as follows.

PHC pile molds 40 and 50 that provide a space in which the concrete constituting the pile body 110 is poured are provided. The PHC pile molds 40 and 50 as described above are manufactured in a cylindrical shape with an empty interior.

The PHC pile molds 40 and 50 are provided in a structure in which the upper mold 40 and the lower mold 50 are separated for convenience in manufacturing the PHC pile 100, but the upper mold 40 and the lower mold 50 are It is elongated in a shape having a semicircular cross-section.

In the upper mold 40 as described above, a bolt hole is formed in which the position fixing bolt 60 formed in the same shape as the fastening member is installed. The bolt hole as described above is formed at a position corresponding to the nut hole portion 122 of the insert nut member 120 exposed on the surface of the pile body 110 .

The position fixing bolts 60 are respectively installed in the bolt holes of the PHC pile molds 40 and 50 . At this time, the male screw portions of the position fixing bolts 60 are fastened to the nut hole portion 122 of the insert nut member 120 while protruding from the inner space of the PHC pile molds 40 and 50 .

That is, the insert reinforcing member 130 and the insert nut member 120 formed integrally with the insert reinforcing member 130 using the position fixing bolts 60 are disposed in the inner space of the PHC pile molds 40 and 50 .

When the insert reinforcing member 130 and the insert nut member 120 are disposed in the inner space of the PHC pile molds 40 and 50, the lower mold 50 of the PHC pile molds 40 and 50 has a plurality of PC steel wires 114 ) is placed. A plurality of PC steel wires 114 are arranged long in the longitudinal direction of the PHC pile molds 40 and 50, and are arranged at positions spaced apart from each other along the circumference of the PHC pile molds 40 and 50.

The plurality of PC steel wires 114 as described above are in a state of being wound in a spiral shape by an iron wire using a knitting machine (not shown). In particular, the insert nut member 120 is disposed between the two first PC steel wires 114a and 114b so that both ends of the insert reinforcing member 130 are caught on the two first PC steel wires 114a and 114b adjacent to each other. .

Then, the first PC steel wire (114a, 114b) and the first PC steel wire (114a, 114b) disposed adjacent to each other on both sides of the insert nut member 120 and the adjacent second PC steel wire (114c, 114d) The steel wire connecting member 140 is connected.

When the installation of the steel wire connecting member 140 is completed, the concrete constituting the pile body 110 is poured into the lower mold 50 , and the lower mold 50 and the upper mold 40 are combined. As described above, the PHC pile molds 40 and 50 in which the upper mold 40 and the lower mold 50 are combined are centrifugally molded for a predetermined time. Accordingly, the pile body 110 in which the hollow part 112a is formed in the longitudinal direction in the central part by the centrifugal force applied to the PHC pile molds 40 and 50 is manufactured.

When the curing of the concrete is completed after a certain period of time, the position fixing bolt 60 is removed from the upper mold 40, the upper mold 40 and the lower mold 50 are separated, and the PHC file 100 is demolded. .

Accordingly, the insert nut member 120 and the insert reinforcing member 130, the PC steel wires 114, and the first PC steel wires 114a and 114b and the second PC steel wire fixed by the position fixing bolt 60 are fixed. The steel wire connecting member 140 connected to the 114c and 114d is disposed to be embedded in the concrete constituting the pile body 110 . In addition, a plurality of nut hole portions 122 of the insert nut member 120 are exposed to be spaced apart from each other in the vertical direction on the surface of the pile body 110 .

As described above, in the embodiment of the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but these are only provided to help a more general understanding of the present invention, and the present invention is limited to the above embodiments Various modifications and variations are possible from these descriptions by those of ordinary skill in the art to which the present invention pertains. Accordingly, the spirit of the present invention should not be limited to the described embodiments, and not only the claims described below, but also all of the claims and all equivalents or equivalent modifications will fall within the scope of the spirit of the present invention.

10: retaining wall
20: belt
30: wale bracket
100: PHC file for retaining wall
110: file body
112: concrete pile body
114: PC liner
114a, 114b: the first PC liner
114c, 114d: 2nd PC liner
120: insert nut member
130, 132: insert reinforcement member
140: steel wire connection member

Claims (7)

In the PHC file used for the construction of the retaining wall,
A file body with a plurality of PC steel wires built-in;
an insert nut member installed to be embedded in the concrete constituting the pile body so that the nut hole portion is exposed on the surface of the pile body;
An insert reinforcing member connected to the insert nut member and installed to be embedded in the concrete together with the insert nut member, and supporting the insert nut member to resist the pulling force acting on the insert nut member after the PHC pile is constructed including;
The insert reinforcing member is provided to support the insert nut member by hanging on at least one first PC steel wire disposed adjacent to the insert nut member among the PC steel wires,
The first PC steel wire is installed to be embedded in the concrete together with the insert nut member, and the first PC steel wire is connected to another PC steel wire to disperse and support the pulling force of the insert nut member transmitted to the first PC steel wire by the insert reinforcing member It further comprises; a steel wire connection member;
The steel wire connecting member is provided to connect the first PC steel wire and the second PC steel wire adjacent to the first PC steel wire,
A first connecting ring portion for connecting to the first PC steel wire is provided at one end of the steel wire connecting member, and a second connecting ring portion for connecting to the second PC steel wire is provided at the other end of the steel wire connecting member,
The first connecting ring portion and the second connecting ring portion are formed in a structure in which both ends of the steel wire connecting member are bent so that they can be respectively hung on the first PC steel wire or the second PC steel wire,
The steel wire connecting member is bent to a first length of any one of the first connecting ring portion or the second connecting ring portion for the convenience of assembly with the first PC steel wire and the second PC steel wire, and the first PHC file for retaining wall, characterized in that the other one of the connecting ring portion or the second connecting ring portion is bent to a second length shorter than the first length.
delete The method of claim 1,
The PC steel wires are arranged long in the longitudinal direction of the pile body, are arranged to be spaced apart from each other along the circumferential direction of the pile body,
The insert nut member is disposed between the PC steel wires,
The insert reinforcing member is disposed on the inner side in the radial direction of the pile body than the first PC steel wires disposed adjacent to both sides of the insert nut member, both ends extend long and intersect with the first PC steel wires PHC file for retaining wall, characterized in that.
4. The method of claim 3,
The nut hole portion is formed at one end of the insert nut member, and the insert reinforcing member is connected to the other end of the insert nut member,
The insert reinforcing member is provided in a bar shape or a rod shape in which both ends are longer than the spacing between the first PC steel wires,
A portion between both ends of the insert reinforcing member is connected to the other end of the insert nut member in a manner that is welded or fastened, or is connected to an assembly hole formed through the other end of the insert nut member in a manner that is fitted PHC file for retaining wall.
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