KR101867002B1 - PHC Pile for Retaining Wall having Reinforcement in Main Hole, and Constructing Method thereof - Google Patents

Abstract

The present invention relates to a PHC pile for retaining soil having hollows formed therein for supporting a back earth pressure in an earth retaining wall, and more particularly, to a planar reinforced structure having a flat cross- The PHC pile is inserted in the hollow of the PHC pile and the PHC pile for retaining is integrated with the end face reinforcement so as to maximize the bending stiffness of the PHC pile for the retention against the distribution of the back earth pressure in the vertical direction, And a method of constructing the PHC pile.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PHC pile having a reinforcing structure by hollow insertion of a cross-sectional reinforcing member and a construction method thereof,

The present invention relates to a " Pre-tensioned Spun High Strength Concrete Pile "and a" Construction Method "for installing the retaining wall to support a back earth pressure when constructing an earth retaining wall such as a retaining wall A reinforcing body of a planar shape having a smaller sectional size from the bottom to the top in the vertical direction is formed in the hollow portion of the PHC pile in the vertical direction in the vertical construction of the PHC pile in which the hollow is formed to support the earth pressure in the earth- The PHC pile for retaining with a reinforced structure of a hollowed-in reinforcing body reinforced by maximizing the flexural rigidity of the PHC pile corresponding to the distribution of the back earth pressure in the vertical direction, The construction method thereof ".

PHC piles are often installed to support the back earth pressure in building retaining walls such as retaining walls. Korean Patent Laid-Open Publication No. 10-2017-0005991 discloses an example of a prior art for constructing an earth retaining wall using a PHC pile.

When the PHC pile supports the earth pressure on the wall of the retaining wall, the PHC pile is subjected to the flexural load due to the back earth pressure. Since the PHC pile is originally made of the compression member, There is a risk that it is not possible to exhibit sufficient bending stiffness. In order to reinforce the bending stiffness of the PHC pile, a method of filling a filler such as concrete in the vertical hollow of the PHC pile is suggested, but simply filling the filler material may not provide sufficient reinforcement to secure the back earth pressure safely .

Particularly, in the conventional technology proposed hitherto, the filling material is filled in the entire vertical height of the PHC pile without considering the action of the back earth pressure, and such a filling material filling method can not efficiently reinforce . Fig. 1 shows a state in which a back soil pressure and a water pressure due to ground water are acting on a conventional filled PHC pile having a cavity filled with a filler material with respect to the whole height of the vertical wall of the earth retaining wall. A schematic side view is shown. As shown in FIG. 1, the back earth pressure acts in the shape of a right angle triangle gradually decreasing with the vertical upward direction, and the water pressure acts in the same manner. Although the largest horizontal load is applied to the lower end of the PHC pile in the retaining wall and the load in the horizontal direction is reduced toward the upper end, the conventional art does not consider the behavior and distribution of the external load The filler is filled in the entire hollow portion over the entire vertical height of the PHC pile, and there is a problem of inefficiency that the reinforcement becomes insufficient at the lower end of the PHC pile and the excessive reinforcement is made at the upper end of the PHC pile.

In addition, as mentioned above, there is a limit in that the PHC pile can not be sufficiently reinforced to safely support the external lateral load including the back earth pressure in the prior art in which the filler is simply filled in the hollow.

Korean Patent Publication No. 10-2017-0005991 (published on October 17, 2017).

The present invention has been developed in order to overcome the limitations of the prior art as described above, and it is an object of the present invention to provide a PHC pile capable of supporting a horizontal load such as a back earth pressure and a water pressure in order to construct an earth retaining wall, It is an object of the present invention to provide a new technique capable of effectively reinforcing the flexural stiffness of the PHC pile and sufficiently reinforcing the PHC pile to safely support the horizontal load in consideration of the action of the lateral load acting in a reduced right triangle shape .

In order to achieve the above object, according to the present invention, there is provided a soil-retaining PHC pile installed vertically in order to support soil gypsum in an earth retaining wall, wherein a cross-sectional reinforcing body is vertically inserted in the hollow, And the bending stiffness of the PHC pile for retaining walls is reinforced by a cross-sectional reinforcing body. The tapered reinforcement is a planar member extending vertically so as to have a width in a horizontal direction in which a horizontal load is applied from the backing gravel, and is made of a member having a tapered shape such that the width in the horizontal direction gradually decreases A PHC pile for earth retaining is provided.

Also, the present invention provides a method for constructing a soil-retaining PHC pile for supporting soil gypsum in a retaining wall, wherein the lower end of the soil-retaining PHC pile is penetrated into the ground, thereby installing the soil-retaining PHC pile vertically; Sectional reinforcing member having a tapered shape so as to gradually decrease the width in the horizontal direction while vertically upwardly extending, and a planar member extending vertically so as to have a width in the horizontal direction in which a horizontal load acts from the back- Inserting the PHC pile into the hollow of the earth retaining pile; The method of constructing a PHC pile for soil retention is provided by integrating the tapered end reinforcement with the PHC pile for earth retaining so that the bending stiffness of the PHC pile for earth retaining is reinforced by the stepped reinforcement.

In the PHC pile for earth retaining and the method of constructing the same according to the present invention, the cross-section reinforcing member is a planar member extending vertically so as to have a width in the lateral direction in which horizontal loads are applied from the back soil, A member having a right triangular shape when its cross section is gradually reduced and viewed in a lateral direction; A pre-formed cross-section reinforcing member is preliminarily prepared in a state in which a lower shield plate for closing the hollow is provided at the lower end of the cross-section reinforcing member, and inserted into the hollow; And the filler is filled in the hollow space in the upper space of the lower shield plate so as to cure the filler in a state where the lower portion of the reinforcement is embedded in the filler material, And may be configured to integrate with PHC piles for retaining purposes.

Further, in addition to or in addition to the above-described structure, in the state where the variable-section reinforcing member is vertically inserted into the hollow, an upper block plate device is provided, and a position spaced downward from the upper end of the variable- The filler is filled in the hollow space in the upper space of the hollow portion and the filler is cured in the state that the upper portion of the cross section reinforcer is embedded in the filler so that the cross- It may have a configuration for integrating it.

On the other hand, in the present invention, when inserting the end face reinforcing member in the hollow, the vertical straight side face is positioned rearward in the right triangle shape of the cross-sectional reinforcing member and the straight line side reinforcing member It can be inserted and placed.

According to the present invention, since the cross-sectional reinforcing member is inserted into the hollow of the PHC pile for retaining and the cross-sectional reinforcing member is integrated with the PHC pile for retaining by the filler, the flexural stiffness is greatly enhanced as a single member. A sufficient bending resistance sufficient to maintain the structural stability with respect to the horizontal load such as the back earth pressure and the hydraulic pressure can be exerted.

Particularly, in the present invention, since the cross-section reinforcing member has a structure in which its cross-sectional size decreases as it goes upward, the flexural stiffness of the PHC pile for retaining reinforced by the cross-sectional reinforcing member also gradually decreases with the vertical upward direction. This configuration corresponds to the action and shape of the horizontal load acting in the shape of a right triangle. By this arrangement, the reinforcement can be made at optimum efficiency in accordance with the horizontal load distribution acting on the PHC pile for retaining with minimized unnecessary reinforcement So that the reinforcing efficiency can be maximized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing a state in which back earth pressure and water pressure are applied to a PHC pile in an earth retaining wall. FIG.
FIG. 2 is a schematic half cross-sectional perspective view showing a state in which a cross-sectional reinforcing member is vertically inserted and disposed in a hollow of a PHC pile for earth retaining according to the present invention.
Fig. 3 is a schematic half cross-sectional perspective view showing a state in which the variable-section reinforcing member is vertically inserted into the hollow, following the state of Fig. 2;
4A to 4C are schematic perspective views of an embodiment of a cross-section reinforcing member according to the present invention.
5 is a schematic plan view in the vertical direction along arrow AA in Fig.
Figure 6 is a schematic side view of the state of Figure 3;
FIGS. 7 to 10 are schematic side views sequentially showing a state in which the filling material is filled in the hollow so that the cross-sectional reinforcing member is fixed after the state of FIG. 6, respectively.
11 is a schematic perspective view of an example of an upper shielding plate device.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby. In particular, in the present specification including the claims, the PHC pile of the present invention, which is constructed for the construction of the earth retaining wall and supports horizontal loads such as back earth pressure and water pressure, is referred to as "PHC pile for earth retaining. &Quot; In the present specification including claims, the direction in which the horizontal load acts in a state where the earth retaining wall is cut into a vertical virtual vertical plane is referred to as "horizontal direction ", and the direction orthogonal to the horizontal direction and horizontal direction, i.e., the width of the earth retaining wall Direction is referred to as "lateral direction ". In the PHC pile for earthmoving, the direction of contacting the back soil is referred to as " rear ", and the opposite direction is referred to as " front. &Quot;

2 is a schematic half cross-sectional perspective view showing a state in which the end face reinforcing member 2 is vertically inserted and disposed in the hollow 10 of the PHC pile 1 for retaining clay according to the present invention. Sectional perspective view showing a state in which the stepped reinforcing member 2 is vertically inserted into the hollow 10 of the PHC pile for earthwork 1 following the state of FIG.

As illustrated in the drawings, in the present invention, a cross-sectional reinforcing member 2 is vertically inserted and disposed in a hollow 10 of a PHC pile 1 for retaining pillar installed at a lower end into the ground, The reinforcing member 2 and the PHC pile 1 for retaining the pile 1 are filled with the filling material 3 by filling the whole or a part of the inside of the hollow 10 in which the pile 2 is disposed with the filling material 3 such as concrete or mortar, So that the flexural stiffness of the soil retaining PHC pile 1 is reinforced by the stepped reinforcing member 2.

2 and 3 show a state in which the filler 3 is not yet filled. Particularly, in FIGS. 2 and 3, for the sake of convenience, the vertical installation of the soil piling PHC pile 1 and the construction of the backsided soil 200 are completed The reinforcing member 2 of the backsheet 200 is inserted after the reinforcing member 2 is inserted into the reinforcing member 2. However, at the time of reinforcing the PHC pile 1 for soil- It may be done before the construction is completed. That is, even if the soil gypsum PHC pile 1 is vertically penetrated into the ground surface before the soil gypsum 200 is constructed, the resilient body 2 can be inserted into the hollow 10.

4A to 4C are schematic perspective views of an embodiment of a cross-sectional reinforcing member 2 installed for reinforcing the PHC pile 1 for retaining clay in the present invention. In the present invention, the cross-section reinforcing member 2 is a vertically extending member having a width in the horizontal direction, and is a tapered member such that the cross-section is reduced (the width in the horizontal direction is reduced) while vertically upward. Figs. 4A to 4C Sectional reinforcing member 2 according to the embodiment of the present invention has a tapered shape so as to have an approximately right-angled triangular shape when viewed in the lateral direction and to have a reduced width in the horizontal direction. The cross-section reinforcing member 2 according to the first embodiment shown in FIG. 4A has a frame-like structure in which the rod members are coupled in a lattice form, The reinforcement member (2) is made of a right triangular member having a through hole (28) formed in a plate member having a thickness. Of course, it may be formed of a simple plate material in which the through holes 28 are not formed. In the case of the cross-section reinforcing member 2 according to the third embodiment shown in FIG. 4C, the vertical reinforcing bars 27 and the horizontal reinforcing bars 26 are assembled to form a reinforcing bar assembly. As described above, And a right triangle is formed so that the horizontal width of the assembly is reduced. In the present invention, the cross-section reinforcing member 2 may have various configurations. For the sake of convenience, the cross-sectional reinforcing member 2 according to the first embodiment shown in FIG. The invention will now be described.

The bottom shield plate 23 may be provided at the lower end of the tapered PHC pile 1. The lower shield plate 23 may be provided at the lower end of the tapered PHC pile 1, End reinforcement member 2 is disposed in the hollow 10 of the side-end reinforcement member 2 so as to be positioned at a predetermined height in the direction of the arrow. In order to arrange the cross-sectional reinforcing member 2 in the hollow 10 of the cross-sectional reinforcing member 2 while hanging, the upper end of the cross-sectional reinforcing member 2 is provided with a stitching device May be provided.

The hooking device may include a staple flange 21 extending over the upper surface of the retaining PHC pile 1 and a transverse coupling bar 22 crossing the cross section of the staple flange 21. In this case, The upper end of the cross-sectional reinforcing member 2 is assembled and disassembled into a transverse engagement bar 22 so as to be disassembled. In the embodiment shown in the drawing, the staggering flange 21 is in the form of a ring and is placed on the upper surface of the retaining PHC pile 1, but the staggering flange 21 is formed on the upper surface of the retaining PHC pile 1 It is not necessary that the stiffening flange 21 be formed only in the form of a complete ring as described above, and it is not necessary that the stiffening flange 21 be formed only along the top surface circumference of the retaining PHC pile 1 It may be formed in a form in which it is spanned intermittently. The transverse coupling bar 22 is a member for assembling and coupling the upper end of the cross sectional reinforcing member 2 to the transverse flange 21 in a disassemblable form. It is sufficient that such a function is exhibited, It is not necessary to cross the vertical cross section of the transverse flange 21 and furthermore it is not limited to the member in the form of a bar.

As described above, the stepped reinforcement member 2 made of a flat member having a substantially right-angled triangular shape. And is vertically inserted and disposed in the hollow 10 of the soil retaining PHC pile 1, as shown in FIGS. 2 and 3. Fig. 5 shows a schematic plan view in the vertical direction of the state shown in Fig. 3, and Fig. 6 shows a schematic side view of the state of Fig. 5, the plane formed by the side surface reinforcement member 2 is orthogonal to the front surface of the rear soil gypsum 200, Sectional reinforcement member 2 in a direction in which the horizontal load acts from the backside gravel, that is, in the horizontal direction. In addition, it is preferable to insert and arrange the cross-sectional reinforcing member 2 so that the vertical side surface of the rectangular cross-sectional reinforcing member 2 faces rearward. In particular, as shown in FIG. 6, It is more preferable that the vertical side is brought into close contact with the inner surface of the hollow 10 of the retaining PHC pile 1. [

In the embodiment shown in Figs. 2 to 6, the cross-sectional reinforcing member 2 is vertically inserted into the hollow 10 of the retaining PHC pile 1 in a suspended form, The reinforcement member 2 may be placed so that the lower end of the reinforcement member 2 directly touches the bottom surface of the hollow 10 when the reinforcement member 2 is inserted into the hollow 10. In this case, the side section reinforcing member 2 is placed on the ground surface and is in an upright state, so that the lower blocking plate 23 and the hooking mechanism can be omitted. Only the operation of fixing the upper end of the cross-section reinforcing member 2 to the upper end of the PHC pile 1 for retaining clay is sufficient so that the position of the cross-sectional reinforcing member 2 is not changed, The value can be omitted. In the present invention, it is also possible to carry out an operation of filling a filling material to be described later in a state in which the lower end of the tapered end reinforcement member 2 is directly contacted with the ground surface in the hollow 10.

However, if the lower end of the PHC pile 1 for soil retaining is deeply penetrated, it may be inefficient to install the lower end of the cross-sectional reinforcing member 2 directly on the ground surface in the hollow 10 as described above . Therefore, when the lower end of the soil retaining PHC pile 1 is deeply penetrated, the lower shielding plate 23 and the stiffening device are assembled to the stiffened reinforcement member 2 as described above, 2 is inserted into the hollow 10 so that the end face reinforcement member 2 is positioned in the hollow 10 in a suspended state. In this case, when the cross-sectional reinforcing member 2 is inserted into the hollow 10, the latching flange 21 and the transverse engagement bar 22 can be inserted into the hollow flange 21, Sectional reinforcing member 2 is disposed in the hollow 10 in the form of hanging in the air as shown in Fig. 6, and the lower shielding plate 23 Thereby blocking the hollow 10 and blocking it.

Figs. 7 to 11 are schematic side views sequentially showing a state in which the filling material 3 is filled in the hollow 10 so that the cross-sectional reinforcing member 2 is fixed after the state of Fig. 6, respectively. After the end face reinforcing member 2 is inserted and disposed in the hollow 10, the filler 3 is filled in the hollow 10 so that all or a part of the side face reinforcement member 2 is embedded in the filler 3 . The filling material 3 is first filled in the hollow 10 as shown in Fig. 7, so that the lower portion of the cross-sectional reinforcing member 2 is embedded in the filler 3. The filler 3 is filled only above the lower shielding plate 23 because the lower shielding plate 23 blocks the hollow 10. [ Therefore, the inefficiency of filling the filler 3 up to the portion that does not help to reinforce the bending stiffness of the soil-retaining PHC pile 1 can be prevented. In filling the filling material 3 so that the lower portion of the cross-sectional reinforcing member 2 is filled, filling the filler 3 to a height above the groundwater level so as to exhibit sufficient reinforcing and supporting force against water pressure in consideration of the groundwater level desirable.

When the filling material 3 is filled and hardened in the hollow 10 as described above, the cross-sectional reinforcing member 2 is integrated with the PHC pile 1 for earth retaining so that the cross-sectional reinforcing member 2 and the PHC pile 1 is a single member, the flexural stiffness of the PHC pile 1 for retaining clay is greatly improved. Therefore, when a flexural load is applied to the PHC pile 1 for earth retaining due to the back earth pressure and the water pressure, the bending resistance due to the reinforced pillar 2 integrated with the PHC pile 1 for retaining is higher than the PHC pile for retaining (1) itself to the bending resistance, thereby exhibiting sufficient bending resistance to maintain the structural stability against horizontal loads such as back pressure and water pressure. That is, the PHC pile 1 for soil retaining is sufficiently reinforced to safely support horizontal loads such as back earth pressure and water pressure.

 As mentioned earlier, the back soil and water pressure act in the form of a right-angled triangle decreasing gradually in a vertical upward direction. Therefore, in the retaining PHC pile 1, the lower portion requires a considerably large flexural stiffness, while the upwardly required flexural stiffness is gradually reduced. In the present invention, the cross-sectional reinforcing member 2 has a configuration in which the cross-sectional size of the cross-sectional reinforcing member 2 is reduced toward the upper side. The flexural stiffness of the PHC pile 1 for retaining the cross- And gradually decreases. The change in the bending stiffness of the PHC pile 1 for earth retaining purposes corresponds to the mode and shape of the horizontal load acting in the shape of a right angle triangle gradually decreasing with the vertical upward direction and the PHC pile for retaining with the unnecessary reinforcement being minimized So that the bending reinforcement can be achieved at an optimum efficiency in accordance with the horizontal load distribution acting on the bearing 1. As described above, in the present invention, unnecessary reinforcement is minimized and bending reinforcement corresponding to the distribution of the working load is performed, thereby maximizing the reinforcing efficiency.

The filling material 3 is filled in the hollow 10 in which the side wall reinforcing member 2 is disposed so that only a part of the lower part of the side wall reinforcing member 2 is buried in the filling material 3 as shown in Fig. However, it is also possible to fill the entire hollow 10 with the filler 3 so that the whole of the cross-sectional reinforcing member 2 is filled in the filler 3. [ A part of the lower part of the side wall reinforcement member 2 and a part of the upper part of the side wall reinforcement member 2 vertically downwardly from the upper end of the side wall reinforcement member 2, ). ≪ / RTI > After the filling material 3 filled in the lower part of the hollow 10 is sufficiently cured to fix the cross-sectional reinforcing member 2, the transverse flange 21 and the transverse coupling bar 22 are cut in the cross- And separates from the reinforcing member (2).

8 shows a state in which the upper block plate device 24 is installed in order to fill a part of the upper part of the cross-sectional reinforcing member 2 into the filler 3 following the state of Fig. 7, and Fig. 9 10 shows a state in which the upper shielding plate device 24 is installed and the filling material 3 is filled on the shielding plate member 240 of the upper shielding plate device 24 in the state of FIG. 2 are partially buried in the filler 3. In this case, Fig. 11 shows a schematic perspective view of an example of the upper blocking plate device 24. As shown in Fig.

In the case where only a lower section of the lower end surface reinforcement member 2 is to be embedded in the filler material 3, after the filler material 3 filled with the side surface reinforcement member 2 is hardened, The upper end of the soil retaining PHC pile 1 may be subjected to a finishing work similarly to the prior art in which the transverse coupling bar 22 is separated from the cross sectional strengthening body 2 and the earth retaining wall is constructed by using the PHC pile. 8 and 9, when the upper part of the upper end portion of the side end reinforcement member 2 is also buried in the filling material 3 in addition to the lower end portion of the lower end face reinforcement member 2, Is installed in the hollow (10). As shown in FIG. 11, the upper block plate device 24 includes a shielding plate member 240, an upwardly extending lower end coupled to the blocking plate member 240, and an upper end connected to the upper end of the retaining PHC pile 1 And a hanger rod 241 for covering. The cut-off plate member 240 is formed with a cut-through hole 242 so that the upper end of the cross-sectional reinforcing member 2 passes through. The shielding plate member 240 is inserted into the hollow 10 so that the upper end of the tapered end reinforcement member 2 passes through the cutout through hole 242 and the upper end of the hanger rod 241 is inserted into the hole 10 of the PHC pile 1 The upper blocking plate device 24 is installed so that the blocking plate member 240 is disposed at a predetermined depth downward from the upper end of the retaining PHC pile 1 so that the hollow 10 is blocked. That is, the blocking plate member 240 is positioned in a state where the hollow 10 is blocked at a position where the blocking plate member 240 is spaced downwardly by a predetermined distance from the upper end of the end face reinforcement member 2.

10, the space above the shielding plate member 240 of the upper shielding plate 24 is filled with the filling material 3 so that the upper portion of the side-end reinforcing member 2 is embedded in the filling material 3 And the filler 3 is hardened so that the upper portion of the cross-section reinforcing member 2 is integrated with the retaining PHC pile 1 by the filler 3. As described above, the PHC pile 1 for retaining and the cross-section reinforcing member 2, which are firmly integrated at the upper and lower portions, more effectively reinforce the flexural stiffness of the soil retaining PHC pile 1, The PHC pile 1 for earth retaining according to the present invention exhibits more excellent bending resistance against horizontal loads such as back earth pressure and water pressure.

Particularly, as the retaining PHC pile 1 exhibits greater bending resistance, the installation site of the retaining PHC pile 1, the location of the retaining PHC pile 1, The size and the like can be reduced. As a result, the cost for constructing the earth retaining wall can be greatly reduced.

1: PHC pile for retaining clay
2:
3: Filler
10: hollow

Claims (8)

delete A retaining PHC pile (1) which is vertically installed to support the back soil from the earth retaining wall,
The reinforcing member 2 is vertically inserted into the hollow 10 of the retaining PHC pile 1 and is integrated with the retaining PHC pile 1 so that the reinforcing member 2 for retaining PHC The stiffness of the pile 1 is reinforced.
The cross section reinforcing member 2 is a planar member that extends vertically so as to have a width in the horizontal direction in which a horizontal load acts from the backing gravel. The horizontal cross section of the cross section reinforcing member 2 gradually decreases in the horizontal direction while vertically upward, A member having a right triangular shape when viewed from above;
A lower shield plate 23 is provided at the lower end of the cross section reinforcing member 2 so as to close the hollow 10.
The filler 3 is filled in all or a part of the hollow 10 in the upper space of the lower shielding plate 23 in a state where the modified end face reinforcement member 2 is vertically inserted into the hollow 10, Wherein the filler material (3) is cured in a state where the lower portion of the body (2) is embedded in the filler material (3) so that the cross-section reinforcer material (2) is integrated with the PHC pile PHC piles for.
3. The method of claim 2,
The upper shielding plate device 24 is installed in the hollow 10 and is spaced downwardly from the upper end of the side end reinforcement member 2 in a state in which the side end reinforcement member 2 is vertically inserted into the hollow 10 The hollow 10 becomes blocked in position;
The filling material 3 is filled in the hollow 10 in the upper space above the position where the hollow 10 is blocked by the upper blocking plate 24 so that the upper portion of the side wall reinforcement 2 is embedded in the filler 3 And the filler material (3) is cured with the PHC pile (1) for retaining the end face reinforcing member (2).
The method according to claim 2 or 3,
When the side section reinforcement member (2) is inserted into the hollow (10), the vertical straight side faces in the right triangular shape are located rearward;
Wherein the cross-section reinforcing member (2) is disposed in the hollow (10) so as to be aligned in a horizontal direction when viewed in a plan view.
delete A method for constructing a soil-retaining PHC pile (1) for supporting a back soil material in an earth retaining wall,
A PHC pile (1) is installed vertically so that the lower end of the PHC pile (1) for piling is penetrated into the ground;
And a horizontal member extending vertically so as to have a width in a horizontal direction in which a horizontal load is applied from the backing gravel. The horizontal width of the cross section gradually decreases while vertically upward, and a right triangular shape (2) made of a member is inserted into the hollow (10) of the PHC pile (1) for earth retaining;
So that the flexural stiffness of the PHC pile (1) for retaining is reinforced by the stepped reinforcement (2) by integrating the modified end face reinforcement (2) with the retaining PHC pile (1);
The side end reinforcement member 2 is preliminarily formed in the lower end of the side end reinforcement member 2 with the lower shielding plate 23 closing the hollow 10 and inserted into the hollow 10;
The side wall reinforcement member 2 is vertically inserted into the hollow 10 and then the filler 3 is filled in all or a part of the hollow 10 in the upper space of the lower barrier plate 23, 2) is embedded in the filler material (3), the filler material (3) is cured to integrate the stepped reinforcing material (2) with the PHC pile (1) for earth retaining. Way.
The method according to claim 6,
The upper shielding plate device 24 is provided at a position spaced downward from the upper end of the side end reinforcement member 2 in a state in which the side end reinforcement member 2 is vertically inserted into the hollow 10, After the hollow 10 is cut off by the device 24, the filling material 3 is filled in the hollow 10 in the upper space above the position where the hollow 10 is blocked by the upper blocking plate device 24, Wherein the filler material (3) is cured in a state that the upper portion of the body (2) is embedded in the filler material (3), thereby integrating the end face reinforcement material (2) with the PHC pile (1) for retaining material. .
8. The method according to claim 6 or 7,
When inserting the variable section reinforcing member 2 into the hollow 10,
Characterized in that the vertical straight side face is located rearward in a right triangular shape of the side section reinforcing member (2), and the side sectional reinforcing members (2) are inserted and arranged in a straight line in the horizontal direction Construction method.

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