KR20160044709A

KR20160044709A - Precast piers and precast construction method using the same piers

Info

Publication number: KR20160044709A
Application number: KR1020140139362A
Authority: KR
Inventors: 심창수; 이상용
Original assignee: 중앙대학교 산학협력단
Priority date: 2014-10-15
Filing date: 2014-10-15
Publication date: 2016-04-26
Also published as: KR101687072B1; WO2016060334A1

Abstract

The present invention relates to a precast bridge pier and a precast bridge pier construction method using the precast pier bridge. More particularly, the present invention relates to a precast pier bridge construction method of forming a hollow on a lower surface of a lowermost segment to increase a prestress generated in a joint between a pierce segment and a foundation plate, And a precast bridge pier construction method using the same. According to one aspect of the present invention, A pillar portion including a plurality of pierce segments stacked on the base portion; And a capping portion disposed on the upper portion of the pillar portion, wherein a lowermost segment of the plurality of piercing segments has an area in contact with the base portion at the lower surface thereof smaller than a front end surface thereof in order to increase a prestress acting on the lowermost segment A precast bridge pier provided with a hollow segment having a partial hollow that is recessed by a predetermined length from the central portion thereof may be provided.

Description

[0001] PRECAST PIERS AND PRECAST CONSTRUCTION METHOD USING THE SAME PIERS [0002] BACKGROUND OF THE INVENTION [0003]

The present invention relates to a precast bridge pier and a precast bridge pier construction method using the precast pier bridge. More particularly, the present invention relates to a precast pier bridge that improves a prestress acting on a joint of a bridge pier segment, and a precast bridge pier construction method using the precast pier bridge.

Generally, a pier supporting a bridge is constructed mainly as a concrete structure as a compression member. In recent years, bridges have been constructed more and more in urban areas. As the roads become more complicated, more and more bridges are being built in urban bridges.

In constructing such a bridge in a downtown area, the bridges supporting the bridges have a long structure. In the method of constructing the bridges, a die made of a slip form of steel is installed, The slip foam is moved upward while the concrete is being poured at a predetermined height from the ground surface to increase the height of the pier.

However, this type of concrete can be installed after concrete cured at a predetermined height is cured. Therefore, it takes a lot of time to construct a bridge, which is an important factor for increasing the construction time of the entire bridge. Therefore, there is a great demand in the industry for improvement of the construction method for the construction of the bridge pier.

One aspect of the present invention is to provide a precast bridge bridge that temporarily forms a partial hollow on a lower surface of a bridge segment to increase an introduction compressive stress caused by a prestress generated at a bridge portion between a bridge segment and a foundation portion and a precast bridge construction method .

Another object of the present invention is to provide a precast bridge pier which increases the prestress acting on the lowermost segment by intermediate-fixing a part of the tension member to the lowermost segment of the pierce segment, and a precast bridge pier construction method using the same.

It is to be understood that the present invention is not limited to the above-described embodiments and that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the following claims .

According to one aspect of the present invention, A pillar portion including a plurality of pierce segments stacked on the base portion; And a capping portion disposed on the upper portion of the pillar portion, wherein a lowermost segment of the plurality of piercing segments has an area in contact with the base portion at the lower surface thereof smaller than a front end surface thereof in order to increase a prestress acting on the lowermost segment Wherein the hollow segment is provided with a hollow portion having a hollow portion that is recessed from the center portion by a predetermined length.

According to another aspect of the present invention, Placing a bottom segment on the base; Intermediate tensioning the first tensioning material from the base to the lowermost segment so that a prestress is applied to the lowermost segment, in a tensioned state on top of the lowermost segment; Stacking a plurality of pierce segments on top of the lowermost segment; Installing a coping portion on top of the plurality of pierce segments; Fastening a plurality of fasteners continuously extending through a coupler at an upper end of the first tensional material to an upper portion of the coping portion in an untensioned state on the upper portion of the coping portion; And fixing the second tensional material extending from the base portion to the coping portion in a tensioned state on the upper surface of the coping portion.

It is to be understood that the solution of the problem of the present invention is not limited to the above-mentioned solutions, and the solutions which are not mentioned can be clearly understood by those skilled in the art to which the present invention belongs It will be possible.

According to the present invention, it is possible to form a partial hollow at the center of the lower surface of the pierced segment, thereby increasing the compressive stress caused by the prestress generated at the joint between the pierced segment and the base.

In addition, the precast bridge segments manufactured at the factory are laminated in multi-stages at the base, and the steel rods are fixed to the lowermost segment, thereby enhancing the prestress acting on the first segment joint, which is the main point of the design.

The effects of the present invention are not limited to the above-mentioned effects, and the effects not mentioned can be clearly understood by those skilled in the art from the present specification and the accompanying drawings.

1 is a perspective view of a precast bridge pier in accordance with an embodiment of the present invention.
2 is a cross-sectional view of a precast bridge pier according to an embodiment of the present invention.
3 is a cross-sectional view of a base according to an embodiment of the invention.
4 is a cross-sectional view of a hollow segment according to an embodiment of the present invention.
5 is a cross-sectional view of a non-beaded segment according to an embodiment of the present invention.
2 and 5 are cross-sectional views taken along the line A-A '.
6 is a flowchart of a precast pier construction method according to an embodiment of the present invention.
7-11 are assembly views of a precast bridge pier according to an embodiment of the present invention.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to be illustrative of the present invention and not to limit the scope of the invention. Should be interpreted to include modifications or variations that do not depart from the spirit of the invention.

Although the terms used in the present invention have been selected in consideration of the functions of the present invention, they are generally used in general terms. However, the present invention is not limited to the intention of the person skilled in the art to which the present invention belongs . However, if a specific term is defined as an arbitrary meaning, the meaning of the term will be described separately. Accordingly, the terms used herein should be interpreted based on the actual meaning of the term rather than on the name of the term, and on the content throughout the description.

The drawings attached hereto are intended to illustrate the present invention easily, and the shapes shown in the drawings may be exaggerated and displayed as necessary in order to facilitate understanding of the present invention, and thus the present invention is not limited to the drawings.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detailed description of known configurations or functions related to the present invention will be omitted when it is determined that the gist of the present invention may be obscured.

According to one aspect of the present invention, A pillar portion including a plurality of pierce segments stacked on the base portion; And a capping portion disposed on the upper portion of the pillar portion, wherein a lowermost segment of the plurality of piercing segments has an area in contact with the base portion at the lower surface thereof smaller than a front end surface thereof in order to increase a prestress acting on the lowermost segment Wherein the hollow segment is provided with a hollow portion having a hollow that is recessed from the center portion by a predetermined length.

And wherein the hollow segment is provided from the bridge segment closest to the lowermost segment to the bridge segment adjacent to the n-th bridge segment (n is a natural number greater than 1) adjacent to the lowest segment among the plurality of bridge segment segments.

The partial hollow may be formed in a shape having the same diameter and height.

The partial hollow can also be filled with a grouting agent after prestressing the lowermost segment by a tensile material.

A first tensile member fixed to the base portion and extending to protrude from an upper portion of the lowermost segment; And an intermediate fixing port for fixing the first tension member in a tensioned state on the upper surface of the lowermost segment.

The intermediate fixture may further include an anchor plate contacting the upper surface of the lowermost segment to transmit a prestress according to a tension condition of the first torsion spring to the lowermost segment and a lock nut disposed on the anchor plate to tension the first tension member, . &Lt; / RTI >

The first tensional material may be a steel rod.

And a plurality of fixing members continuously connected in a non-stretched state from the upper end of the first tensional element to the upper surface of the coping portion.

The lowermost fixture and the first tensional element among the plurality of fixtures may be fastened by a coupler.

A second tensile member fixed to the base portion and extending to an upper surface of the coping portion; And a tension fixture for fixing the second tension member in a tensioned state on the upper surface of the coping unit.

And the second tensional element is a stranded wire.

And wherein the lowermost segment is provided as a hollow segment having a partial hollow; And filling the partial hollow with the grouting agent after the straining step is completed.

Hereinafter, a precast bridge 1000 according to an embodiment of the present invention will be described.

Precast is a concrete member that is put into place or assembled after the concrete has hardened. In other words, it is a concrete member manufactured in advance in a factory or the like and used as a concrete member to be transported to the site. This pre-cast can significantly reduce air and reduce management costs.

FIG. 1 is a perspective view of a precast bridge 1000 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a precast bridge pier in accordance with an embodiment of the present invention.

1, a precast bridge 1000 may include a base 1100, a post 1200, and a coping portion 1300. As shown in FIG. In the precast bridge pier 1000, the base portion 1100, the column portion 1200, and the coping portion 1300 can be stacked one on top of the other in order from the ground.

First, the foundation 1100 serves to support the load of the entire precast bridge 1000. The base 1100 may be fixed or embedded in the ground. The base portion 1100 may be provided in a size capable of supporting the column portion 1200 and the coping portion 1300.

The posts 1200 serve as legs to allow the precast bridge 1000 to have a constant height in the bridge. The column portion 1200 can be formed by laminating a plurality of pierced segments in order.

The coping portion 1300 forms the top of the bridge pier. That is, the coping portion 1300 is seated on the upper portion of the column portion 1200. The coping unit 1300 receives a load from the shift and plays a role of supporting the load.

Each of these components of the precast bridge 1000 can be fastened by a fastener and a tension member. The fixing member serves to fix the base portion 1100 and the pillar portion 1200, the pillar portion 1200 and the coping portion 1300, and the pierce segment of the pillar portion 1200 to each other. In addition, the tension member has a function of fixing the pierce segments of the base part 1100, the column part 1200, the column part 1200, the coping part 1300, and the column part 1200, . As a fixing material, it is possible to use a reinforcing bar which is inexpensive and easy to install, and a steel bar or a strand which can receive a tensile force can be mainly used as a tension material.

In the present invention, the steel rods 1420 are intermediate fixed from the base portion 1100 to the lowermost segment to apply a tensile force to the base portion 1100 and the lowermost segment, so that the strand 1460 extends from the base portion 1100 to the column portion 1200, To the coping portion 1300 to apply the tensile force. Also, the reinforcing bars 1440 as the fixing members may be connected from the lowermost segment to the coping portion 1300 to fix the respective piercing segments and the coping portion 1300 to each other.

The fastening material and the tensioning material can be fixed or fixed by the fixture 1580 or the fixture, respectively. More specific details regarding the fixing material and the tension material will be described later.

Meanwhile, in the present invention, the piercing segment constituting the column portion 1200 may include the hollow segment 1200a and the non-ball segment 1200b. Here, the hollow segment 1200a means a pierced segment having a partial hollow 1240 formed thereunder, and the non-pored segment 1200b means a pierced segment having no partial hollow 1240 formed in the hollow segment 1200a .

The hollow segment 1200a can be manufactured by pouring concrete into a mold and forming a partial hollow 1240 at a corresponding portion by inserting styrofoam or the like into the lower center of the mold when the pierce segment is manufactured.

The column portion 1200 may be formed by laminating the hollow segment 1200a and the non-ball segment 1200b. The lower segment of the column portion 1200 may be formed of a hollow segment 1200a, Segment 1200b.

For example, as shown in FIG. 2, a hollow segment 1200a is introduced into the lowermost segment immediately adjacent to the base 1100 in the column 1200, and a non-hollow segment 1200b is introduced into the remaining bridge segment 1200 Be able to

The precast bridge pillar 1000 should be robust against lateral forces. For example, a lateral force may be applied to the precast bridge pier 1000 due to an earthquake or wind pressure. In such a case, the base portion 1100 and the column portion 1200, or between the column portion 1200 and the coping portion 1300 ) Or the bridge segments 1200 are displaced by the lateral force, the entire precast bridge pier 1000 may be damaged or, in severe cases, collapsed. Therefore, in order to impart rigidity to the precast pier 1000, it is necessary to apply an appropriate prestress to each of the pierces 1000. In particular, It is important to apply a strong tensional force to the corresponding region because the weakest portion between the uppermost segment 1000 and the lowest segment is weakest.

If the hollow segment 1200a is introduced into the lowermost segment as described above, the area in which the base portion 1000 and the lowermost segment contact each other decreases, and consequently, acts on the joints of the base portion 1100 and the lowermost segment The effect of improving the prestress.

Similarly, as the steel rods 1420 are intermediate fixed from the base portion 1100 to the lowermost segment, the effect of enhancing the tension applied to the lowermost segment is further increased.

In the above description, the hollow segment 1200a is introduced into only the lowermost segment of the bridge segment 1100 and the non-hollow segment 1200b is introduced into the bridge segment. Alternatively, The first bridge segment can be introduced into the hollow segment 1200a and the (n + 1) -th bridge segment from the bottom to the uppermost segment can be introduced into the non-bead segment 1200b. Where n is defined as a natural number greater than one.

That is, in the present invention, the columnar part 1200 is formed by introducing the hollow segment 1200a into the lower part and introducing the non-hollow segment 1200b thereon, and the number of the hollow segments 1200a to be introduced is appropriately adjusted Can be determined.

Hereinafter, each component of the precast bridge 1000 according to an embodiment of the present invention will be described in more detail.

FIG. 3 is a cross-sectional view of a base 1100 according to an embodiment of the present invention, FIG. 4 is a cross-sectional view of a hollow segment 1200a according to an embodiment of the present invention, Sectional view of the segment 1200b.

Referring to FIG. 3, the base 1100 may be installed on the ground. The foundation 1100 may be installed in a spot installation manner at the point where the bridge is to be installed.

A steel bar 1420 may be embedded in the base portion 1100. The lower end of the steel bar 1420 may be fixed in the state of being embedded in the base 1100 by the fixing fixture 1520. [

On the upper surface of the base part 1100, a groove having a shape similar to a bottom shape of the piercing segment can be formed so that the piercing segment can be stably stowed.

Also, a sheath tube 1120 for inserting the stranded wire 1460 may be formed in the base portion 1100. The sheath tube 1120 may start to extend from the circumferential surface of the base portion 1100 and penetrate the upper surface. A stranded wire 1460 may be inserted and fixed to the sheath pipe 1120 penetrating through the sheath pipe 1120. The inserted strand 1460 can be fixed to the base 1100 by a fixing fixture 1520 on the circumferential surface of the base 1100.

4 and 5, a piercing segment constituting the column portion 1200 may be provided in a columnar shape. Although the pierce segment is generally provided in a circular column shape and the pierce segment is shown in a circular column shape in the drawings, the shape of the pierce segment in the present invention is not limited to the circular column shape but may be an elliptical column or a polygonal column It is also possible.

A protrusion may be formed around the upper surface of the bridge segment so that the bridge segment seated on the bridge segment stably stays on the upper surface of the bridge segment, and a depression having a shape corresponding to the protrusion of the lower bridge segment may be formed around the lower surface of the bridge segment.

Referring to FIG. 4, the hollow segment 1200a used as the lowermost segment or the lower segment may have a partial hollow 1240 recessed to a predetermined height below the hollow segment 1200a. The partial hollow 1240 may be provided to increase the prestress by minimizing the contact area between the base 1100 and the hollow segment 1200a.

The shape in which the partial hollow 1240 is recessed may be similar to the shape of the circular column and may be, for example, in the form of a circular column, an elliptical column or a polygonal column. Here, in the case of the partial hollow 1240 which is recessed in the form of a circular column, the diameter and the height may substantially match each other. When the diameter and height of the partial hollow 1240 are equal to each other, the stress acting on the upper surface and the side surface of the partial hollow 1240 is equalized.

These partial hollows 1240 may be filled with concrete or mortar, or filled with a member such as styrofoam after the intermediate settling has ended or after the tension using the strand 1460 has been completed.

A sheath tube 1220 may be formed on the hollow segment 1200a. The sheath tube 1220 may be provided to penetrate up and down along the periphery of the partial hollow 1240. The steel rods 1420 and the stranded wire 1460 may be alternately inserted into the sheath tube 1220 in turn. At this time, the diameter of the sheath tube 1220 may be provided to be slightly larger than the diameter of the steel bar 1420 and the strand 1460. The sheath tube 1220 can be filled with a grouting agent after the fixation of the tensile material is completed.

An anchor plate 1542 for fixing the steel bar 1420 to the upper portion of the hollow segment 1200a is formed at an upper portion of the sheath pipe 1220 in which the steel bar 1420 is inserted, 1222 may be recessed.

Referring to FIG. 5, a sheath tube 1260 may be provided inside the non-ballized segment 1200b. The sheath tube 1260 may be provided in a size corresponding to the sheath tube 1220 formed in the hollow segment 1200a.

Hereinafter, a method of constructing the precast bridge pillar 1000 will be described. FIG. 6 is a flowchart of a precast pier construction method according to an embodiment of the present invention

6, a precast bridge pier construction method includes a step S110 of installing a foundation 1100, a step S120 of installing a hollow segment 1200a on the foundation 1100, a step of installing a steel rod 1420 (S140) connecting the reinforcing bars 1440, installing the non-ballized segment 1200b (S150), installing the coping portion 1300 (S160), fixing the reinforcing bars A step S180 of inserting and fixing the strand 1460, and a step of performing grouting (S190).

Hereinafter, each of the above-described steps will be described in more detail.

7-11 are assembly views of a precast bridge 1000 according to an embodiment of the present invention.

Referring to FIG. 7, in the pre-cast pier construction method, the foundation 1100 may first be embedded or fixed on the ground (S110). The base 1100 is generally formed in a manner to be laid in situ, but if necessary, the base 1100 may also be mounted on the ground in a precast manner. The base 1100 may have a bent sheath pipe 1120 formed therein and the lower portion of the steel rod 1420 may be embedded in the base 1100. The lower end of the steel bar 1420 is fixed in the base portion 1100 by the fixing fixture 1520.

Referring to FIG. 8, a hollow segment 1200a may be provided on the base portion 1100 (S120). The hollow segment 1200a may be a lowermost segment or a bridge segment from the bottom to the nth segment.

The hollow segments 1200a are formed on the base portion 1100 such that the steel rods 1420 are inserted into the sheath tube 1220 having the grooves 1222 for intermediate fixing among the sheath tubes 1220 of the hollow segments 1200a. So that the antenna 1200a can be seated. The sheath tube 1220 without the groove 1222 in the sheath tube 1220 of the hollow segment 1200a is installed to be connected to the sheath tube 1220 of the base 1100. [

When the hollow segment 1200a is seated, the steel rod 1420 is intermediate-fixed (S130). After the hollow segment 1200a is seated in the base 1100, a steel rod 1420 extending from the base 1100 to the hollow segment 1200a is applied to the hollow segment 1200a to apply a prestress to the hollow segment 1200a. It can be intermediate-fixed in a tensile state on the upper side.

The steel rod 1420 can be intermediate-fixed by the intermediate fixture 1540, that is, the anchor plate 1542 and the locknut 1544, to describe the intermediate fixation process in more detail. The anchor plate 1542 can be inserted and fixed in the groove recessed in the upper portion of the hollow segment 1200a and then the lock nut 1544 can be inserted into the steel bar 1420 protruding to the upper portion of the anchor plate 1542. Then, the locknut 1544 can be tightened to fix the steel bar 1420 in a tensioned state. The thus tightened steel bar 1420 can apply a tensile force to the hollow segment 1200a through the anchor plate 1542. [

Next, referring to FIG. 9, a reinforcing bar 1440 is connected (S140) and a non-ball segment 1200b is installed (S150).

The reinforcing bars 1440 can be connected to the steel rods 1420 through a coupler 1480. Here, the reinforcing bars 1440 may be connected to the steel rods 1420 by a coupler 1480 provided in substantially the same cross section as the steel rods 1420. The non-ball segment 1200b may be seated on top of the hollow segment 1200b such that the bar 1440 is inserted through the sheath tube 1260 of the non-ball segment 1200b. Here, the reinforcing bars 1440 may serve as fixing members for connecting and fixing the non-ball segments 1200b and the non-ball segments 1200b.

The reinforcing bars 1440 may be inserted into the sheath pipe 1260 while continuously connecting the reinforcing bars 1440 and the reinforcing bars 1440 through the coupler 1480. In this case, . And another non-ball-bored segment 1200b is stacked on top of the non-ball-segment segment 1200b. Here, the reinforcing bars 1440 serve as fixtures for fixing the connection between the non-ball segments 1200b.

After the non-bored segment 1200b is stacked up to the uppermost segment, the coping portion 1300 can be seated (S160). The sheath pipe 1320 connected to the sheath pipe 1260 of the pierced segment is formed in the coping portion 1300 and the reinforcing bars 1440 can be inserted through the sheath pipe 1320. When the coping portion 1300 is seated, the reinforcing bars 1440 can be fixed using the fixture 1580 at the upper portion of the coping portion 1300 (S170). The plurality of reinforcing bars 1440 may be fixed to the upper portion of the coping portion 1300 in a non-tensioned state via the fixture 1580.

The strand 1460 can be inserted into the sheath pipes 1120, 1220, 1260, and 1320 formed in each of the base 1100, the column 1200, and the copings 1300 ). At this time, the stranded wire 1460 can be inserted from the upper side to the lower side.

The stranded wire 1460 may be provided in a length that is connected from the peripheral surface of the base portion 1100 to the upper surface of the coping portion 1300.

The inserted strand 1460 can be fixed to the circumferential surface of the base 1100 through the fixing fixture 1520. [ The fixed strand 1460 extends from the base 1100 to the coping portion 1300 and can be fixed on the upper surface of the coping portion 1300 in tension through the tension fixture 1560. That is, after the anchor plate 1562 is inserted and fixed in the groove 1322 recessed in the upper portion of the coping portion 1300, the strand 1460 protruded to the upper portion of the anchor plate 1562, 1564). Then, the locknut 1564 can be tightened to fix the strand 1460 in a tensioned state. The strand 1460 that has undergone such a process can generate compressive force by tensile force. Due to the compressive force thus generated, the base portion 1100, the column portion 1200, and the coping portion 1300 can be compressed. Therefore, it is possible to prevent cracks and warpage of the precast bridge pillar 1000.

Finally, mortar and concrete (grouting agent) can be placed in the partial hollows 1240 of the sheath pipes 1120, 1220, 1260, 1320 and the hollow segment 1200a. Although not shown in the drawing, the partial hollow 1240 is connected to the sheath tube 1220, so that the partial hollow 1240 can be filled as the grouting agent is filled in the sheath tube 1220.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments of the present invention described above can be implemented separately or in combination.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as falling within the scope of the present invention.

1000: precast bridge 1100: foundation
1120, 1220, 1260, 1320: Sheath tube 1200:
1200a: hollow segment 1222, 1322: groove
1240: partial hollow 1200b: non-centered ball segment
1300: Coping part 1420: Steel bar
1440: Rebar 1460: Strand
1480: coupler 1520: fixed anchorage
1540: Middle anchorage 1542, 1562: Anchor plate
1544, 1564: Locknat 1560: Tension anchorage
1580: Fixture

Claims

A base fixedly installed on the ground;
A pillar portion including a plurality of pierce segments stacked on the base portion; And
And a coping portion disposed on the upper portion of the column portion,
The lower most of the plurality of piercing segments is formed with a partial hollow that is recessed from a central portion of the lower surface in a predetermined length so that an area in contact with the base portion on the lower surface thereof is smaller than a front end surface in order to increase a prestress acting on the lowermost segment Characterized in that it is provided as a hollow segment
Precast piers.

The method according to claim 1,
Wherein the hollow segment is provided with an n-th (where n is a natural number greater than 1) adjacent bridge segment from the bridge segment closest to the lowermost segment of the plurality of bridge segments.
Precast piers.

The method according to claim 1,
Characterized in that the partial hollow is formed in a shape having the same diameter and height
Precast piers.

The method according to claim 1,
The partial hollow is filled with a grouting agent after prestressing the lowermost segment by a tensile material
Precast piers.

The method according to claim 1,
A first tension member fixed to the base portion and extending to protrude from an upper portion of the lowermost segment; And
And an intermediate fixing port for fixing the first tension member in a tensioned state on an upper surface of the lowermost segment
Precast piers.

6. The method of claim 5,
Wherein the intermediate fixation port comprises an anchor plate contacting the top surface of the bottom segment to transmit a prestress according to the tension condition of the first tensions to the bottom segment and a lock nut disposed on the anchor plate to tension the first tensions Included
Precast piers.

6. The method of claim 5,
Characterized in that the first tensional element is a steel rod
Precast piers.

6. The method of claim 5,
And a plurality of fixing members continuously connected in a non-stretched state from the upper end of the first tensional element to the upper surface of the coping portion
Precast piers.

6. The method of claim 5,
The lowermost fixture and the first tension member among the plurality of fixtures are fastened by a coupler
Precast piers.

6. The method of claim 5,
A second tensile member fixed to the base portion and extending to an upper surface of the coping portion; And
And a tension fixture for fixing the second tension member in a tensioned state on the upper surface of the coping unit
Precast piers.

11. The method of claim 10,
Characterized in that the second tensional element is a stranded wire
Precast piers.

Placing a base portion;
Placing a bottom segment on the base;
Intermediate tensioning the first tensioning material from the base to the lowermost segment so that a prestress is applied to the lowermost segment, in a tensioned state on top of the lowermost segment;
Stacking a plurality of pierce segments on top of the lowermost segment;
Installing a coping portion on top of the plurality of pierce segments;
Fastening a plurality of fasteners continuously extending through a coupler at an upper end of the first tensional material to an upper portion of the coping portion in an untensioned state on the upper portion of the coping portion; And
And fusing a second tensional material extending from the base portion to the coping portion in a tensioned state on the upper surface of the coping portion
Precast pier construction method.

13. The method of claim 12,
Providing a lowermost segment as a hollow segment having a partial hollow; And
Further comprising the step of filling the partial cavity with a grouting agent after the straining step is completed
Precast pier construction method.