KR20090088572A - Prestressed concrete member having reasonable arrangement of prestressing tendon - Google Patents

Abstract

A prestress concrete member is provided to reduce the manufacturing cost by reduce the usage of the high-strength concrete. A prestress concrete member comprises a concrete member(10), a plurality of tension members(20), a supporting member(30) and a clamping member(40). A through-hole is formed at the center of the concrete member. The tension member is installed inside the concrete member. The tension member is fixed at the both side of the concrete member and gives the tension to the concrete member. The supporting member comprises a plurality of supporting hole in which the tension member is inserted, and presses the tension member to the circumference direction of the concrete member. The clamping member comprises a plurality of constriction holes in which tension member is inserted.

Description

PRESTRESSED CONCRETE MEMBER HAVING REASONABLE ARRANGEMENT OF PRESTRESSING TENDON}

The present invention relates to a prestressed concrete member in which tension is introduced, and more particularly, a prestressed concrete member capable of using a conventional tensioning device while arranging a tension member as close as possible to a bending moment curve caused by a load acting on the prestressed concrete member. It is about.

In general, prestressed concrete members, such as beams or girders, are applied to the prestressing principle of dissipating the stresses caused by the action of dead or live loads and applying prestressing in the reverse direction. When tension is introduced into the beam through the PC wire, the tensile stress is generated on the upper surface of the beam and the compressive stress is generated on the lower surface of the beam (see FIG. 1A).

However, when the tension is increased, the tensile stress acts on the upper surface of the member, causing cracks, which causes structural problems. Therefore, it was not possible to give the beam a tension of the required size after construction.

In addition, after the introduction of tension, prestress loss caused by creep, dry shrinkage and relaxation of PC steel, which occurs over time, causes the PC steel wire to have significantly less tensile stress than the allowable stress, resulting in smaller compressive stress at the bottom of the beam. In the long run, there may be a problem in the safety of the structure to be subjected to the load according to the bending moment diagram (BMD, Bending Moment Diagram) as shown in FIG. there was.

As a member incorporating such prestress, in addition to the above-described prestressed concrete member, the ground load is used as a countermeasure against the stability and settlement problem of the structure based on the soft ground, in which the ground itself cannot withstand the load transmitted from the upper structure. Since there is a method of reaching the support layer, steel pipe piles, PHC piles, PC pile RC piles, etc., which are produced in advance at the factory, are constructed by a method such as a type construction method or a buried construction method, and the PHC piles have such pre-stressed members. to be.

These PHC piles are more resistant to warpage, rigidity and durability than other conventional piles, and have a smaller deformation amount, as well as a larger allowable bearing capacity and easy jointing with the foundation concrete, which can be constructed on the upper side. It is short and has the advantage of being cheap construction cost has been widely used recently.

These PHC piles are arranged with a pair of shoes having a disk shape at a predetermined distance, and the two ends are fixed to the shoes with a plurality of steel bars or steel wires, respectively, and then the semi-circular upper and lower molds are separated in the longitudinal direction. It is put into the lower mold of, and the concrete is poured into the lower mold to assemble the upper mold to integrate the lower mold and the upper mold, to which prestress is applied by applying a tension force to the installed steel bar or steel wire, thereby, After centrifugal molding of concrete by rotation, it is subjected to primary curing of atmospheric steam curing, and then demolded, and then subjected to secondary curing of autoclave curing, and PHC pile (PHC, Pretentioned spun High strength Concrete Piles ).

However, this PHC pile also has the same problems as the prestressed concrete member described above, that is, the pile surface can be cracked, so the tension cannot be maximized, and the prestress is lost due to the loss of prestress over time. There is a problem that there is a risk that it may interfere with the safety of the structure.

The present invention is to solve the problems of the prior art as described above, it is possible to maximize the tension while using the conventional tension device without a separate tension device, and at the same time there is a fear of cracking in the member even when the tension is increased. It is an object to provide a free prestressed concrete member.

It is another object of the present invention to provide a prestressed concrete member that can effectively cope with the bending stress acting on the member even if the prestress is lost over time.

In order to solve the above object, the prestressed concrete member according to the present invention, a concrete member having a through-hole in the center, a plurality of installed in the concrete member and fixed to both ends of the concrete member to apply a tension force to the concrete member A prestressed concrete member including a tension member, the prestressed concrete member comprising: a support member having a plurality of support holes into which the plurality of tension members are inserted and pressurizing the tension member into which the tension force is introduced in the circumferential direction of the concrete member; It is characterized in that it further comprises a tightening member having a plurality of tightening holes to press the tension member introduced tension force toward the central axis direction of the concrete member.

The concrete member is characterized in that it further comprises a concave formed on the outer peripheral surface concave toward the central axis direction of the concrete member.

The concrete member may further include an inner recess formed on the inner surface of which the through hole is formed to be concave toward the outer circumferential direction of the concrete member.

The support member is disposed on both ends of the concrete member than the tightening member, and the diameter of the circle connecting the centers of the plurality of support holes of the support member is a circle connecting the centers of the plurality of tightening holes of the tightening member. It is characterized by being formed larger than the diameter.

The tightening member is disposed on both ends of the concrete member rather than the supporting member, and the diameter of the circle connecting the centers of the plurality of supporting holes of the supporting member is a circle connecting the centers of the plurality of tightening holes of the tightening member. It is characterized by being formed larger than the diameter.

The fastening member may include a cylindrical fastening member main body disposed on a central axis of the concrete member, one end of which is integrally formed with the fastening member main body, and a plurality of radially provided tightening cutting parts partially embedded in the concrete member; It is characterized in that it comprises a tightening hole formed in the tightening cutting portion through which the tension member is inserted, and a tightening support portion formed at the other end of the tightening cutting portion to be brought into contact with the inner surface of the mold of the prestressed concrete member.

The tightening member may include a disk-shaped tightening member main body disposed on a central axis of the concrete member, one end of which is integrally formed with the tightening member main body, and a plurality of radially provided tightening cut portions partially embedded in the concrete member; It is characterized in that it comprises a tightening hole formed in the tightening cutting portion through which the tension member is inserted.

In addition, the concave groove is formed in a portion which is not embedded in the tightening cutting portion.

The support member has a hollow disk-shaped support member body having the same central axis as the central axis of the concrete member and embedded in the concrete member, a support hole formed in the support member body and through which the tension member is inserted, and the support member. The outer peripheral surface of the member body is formed integrally with the support member body, characterized in that it comprises a support that is supported in contact with the inner surface of the mold of the prestressed concrete member.

In addition, the prestressed concrete member according to the present invention comprises a concrete member having a bean in the center and a plurality of tension members installed in the concrete member and fixed to both ends of the concrete member to apply tension to the concrete member. In prestressed concrete members,

Some of the plurality of tension members are tensioned at both ends of the concrete member in proximity to the outer peripheral surface side of the concrete member, and the rest of the plurality of tension members are tensioned at both ends of the concrete member in proximity to the inner peripheral surface side of the concrete member. ,

A first disc-shaped first main body having a same central axis as the central axis of the concrete member and embedded in the concrete member, a plurality of support holes integrally formed on an outer circumferential surface of the first main body and inserted through the tension member; A first support clamping combined member integrally formed on an inner circumferential surface of the first body portion and having a plurality of tightening holes through which the tension member is inserted;

A second disc-shaped main body having a same central axis as the central axis of the concrete member and embedded in the concrete member, a plurality of support holes integrally formed on an outer circumferential surface of the second body portion and through which the tension member is inserted; It is characterized in that it further comprises a second support tightening member formed integrally with the inner peripheral surface of the second body portion and having a plurality of tightening holes through which the tension member is inserted.

In addition, the first support and tightening member and the second support and tightening member is formed integrally with the first and second body portion and further provided with a support for supporting the inner surface of the mold of the prestressed concrete member Characterized in that.

In addition, a circle formed by the center of the support hole of the first support and tightening member has a diameter larger than a circle formed by the center of the support hole of the second support and tightening member, wherein the circle of the first support and tightening member The circle formed by the center of the tightening hole is characterized by having a diameter smaller than the circle formed by the center of the tightening hole of the second support and tightening member.

The tension member close to the outer circumferential surface side of the concrete member inserts the supporting hole of the first supporting clamping member and the tightening hole of the second supporting clamping member, and closes the inner peripheral surface side of the concrete member. The tension member is characterized by inserting through the tightening hole of the first supporting clamping member and the supporting hole of the second supporting clamping member.

According to the present invention having the configuration as described above, it is possible to maximize the tension while using a conventional tension device without a separate tension device, and at the same time there is no fear of cracking in the member even under increasing tension, under various conditions It is possible to provide a prestressed concrete member in which a prestressing force close to the moment degree that the member receives by various loads applied is introduced.

Accordingly, according to the present invention, as the pre-stressing force is increased as in the prior art to solve the problem that the manufacturing cost is expensive due to the use of high-strength concrete, high prestressing force even under the same tension force even under conditions requiring high prestressing force Since it can be satisfied, it is possible to reduce the manufacturing cost, it is possible to provide a prestressed concrete member that can effectively cope with the bending stress acting on the member even if the prestress is lost over time.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the prestressed concrete member according to the present invention.

In the present specification, the concrete member is described as an PHC pile as an example, but is not necessarily limited thereto, and may be applied to various forms such as a square hollow prestressed concrete pile.

<Example 1>

Figure 2 is a view showing a prestressed concrete pile according to an embodiment of the present invention, Figure 3 is a view showing an embodiment of the fastening member of Figure 2, Figure 5 is a view showing an embodiment of the support member of Figure 2 .

As shown in Figs. 2, 3 and 5, the prestressed concrete member 1 according to the present invention includes a concrete member 10, a tension member 20, a support member 30, and a fastening member 40. It is composed.

The concrete member 10 is, for example, a PHC pile, and the concrete member is arranged with a pair of shoes having a disk shape at a predetermined distance as in the prior art, and the ends thereof are formed by a plurality of steel bars or steel wires. After fixing to the shoe, respectively, and put into the lower mold of the frame of semi-circular upper and lower molds separated in the longitudinal direction, pour concrete into the lower mold to assemble the upper mold to integrate the lower mold and the upper mold, thereby, Prestress is applied by applying a tension force to the installed steel rod or steel wire, and after this, after centrifugal molding of concrete by the rotation of the assembled mold, the primary curing of atmospheric steam curing is performed, and then demolded, and this is again autoclaved. After the secondary curing of curing, a PHC file is constructed.

The concrete member 10 configured as described above is formed with a through-hole in the center.

The tension member 20 is formed of, for example, a plurality of PS steel wires, is installed in the concrete member and is fixed to both ends of the concrete member and is tensioned by the tension device 50 to exert a tension force on the concrete member. .

The outer periphery of the tension member 20 may be further provided with a wire stir-up (wire stir-up) consisting of a wire, as in the prior art.

The support member 30 presses the tension member into which the tension force is introduced in the circumferential direction of the concrete member. As shown in FIG. 5, the supporting member 30 is composed of a supporting member body 31, a supporting hole 32, and a supporting portion 33.

The support member body 31 has the same central axis as the central axis of the concrete member 10 and is embedded in the concrete member, and is formed in a hollow disc shape. The supporting member body 31 has a plurality of supporting holes 32 through which the tension member is inserted. In addition, a support 33 is formed on the outer circumferential surface of the support member body integrally with the support member body and is supported against the inner surface of the mold of the prestressed concrete member.

On the other hand, the tightening member 40, as shown in Figures 3a to 3c, presses the tension member to which the tension force is introduced toward the central axis direction of the concrete member. The tightening member 40 is composed of a tightening member body 41, a tightening cutting portion 42, a tightening hole 43 and a tightening support 44.

The tightening member body 41 is disposed on the central axis of the concrete member, and in this embodiment is configured in a cylindrical shape. The tightening member body 41 has a plurality of tightening cutting portions 42 integrally formed radially. One end of the tightening cutting portion 42 is formed integrally with the tightening member body, the other end is formed with a tightening support 44.

A portion of the tightening cut portion 42 in the longitudinal direction is disposed in the through hole of the concrete member, and a portion is embedded in the concrete member. At the portion embedded in the concrete member, a tightening hole 43 through which the tension member is inserted is provided.

In addition, the tightening portion 44 is formed at the other end of the tightening cutting portion is supported in contact with the inner surface of the mold of the prestressed concrete member.

In addition, a portion which is not embedded in the tightening cutting portion may be further provided with a recessed groove.

Although the supporting member and the fastening member are made of stainless steel in this embodiment, the present invention is not limited thereto, and the supporting member and the fastening member may be made of stainless steel or plastic as long as they are capable of supporting the tension force introduced into the tension member.

After the tension member is inserted through the support member and the support hole and the tightening hole of the support member and the tightening member before tensioning the tension member, both ends of the tension member are fixed to the shoe, respectively, and then put into a mold to support the support member. And fix the position of the fastening member. Then, the concrete is poured and the upper mold is assembled to integrate the lower mold and the upper mold, and then the tensioning device is exerted to apply prestress through the tension device.

Then, the tension cutting part of the prestressed concrete member, which has been centrifugally molded and cured, is cut to introduce a tension force from the tension member to the concrete member.

That is, in this embodiment, the support member is disposed on both ends of the concrete member than the tightening member, the diameter of the circle connecting the center of the plurality of support holes of the support member is the plurality of tightening of the tightening member It is larger than the diameter of the circle connecting the center of the hole.

Thus, the prestressed concrete member according to the present invention is pressurized in the circumferential direction by the support member at both end sides of the member and pressed in the central axis direction by the tightening member, thereby forming a straight line by the combination of the support member and the tightening member. Compared with the arrangement of the tension member having a stronger tension force can be introduced, it is also possible to achieve the arrangement of the tension member closer to the bending moment diagram as shown in Figure 2b.

PHC pile is classified into Class A, B, and C according to the required strength and tension. For example, the concrete strength required for Class B is sufficient, but the degree to support the tension to be introduced and the loss of tension According to the present invention, when the tensile strength can be expressed and a costly C type can be selected, according to the present invention, the combination of the supporting member and the tightening member provides a stronger tension than the arrangement of the tension member having a straight line shape. Since it can be introduced, it can be manufactured with class B or less, so that the manufacturing cost can be reduced, and the arrangement of the tension member closer to the bending moment degree can be achieved, so that it can cope more effectively with the action of the load over time.

On the other hand, the concrete member surrounding the tension member in the center portion of the prestressed concrete member according to the present invention having the arrangement of the tension member as described above, i.e., at both ends thereof, does not function more than the covering member. Therefore, as shown in FIG. 9, the fitting material 80 is arrange | positioned at the upper and lower molds at the time of shaping | molding the said member, and it can save more concrete material.

That is, the concrete member may further include a concave portion 11 formed on the outer circumferential surface of the concrete member to be concave toward the direction of the central axis of the concrete member, and the inner surface on which the through hole is formed is concave toward the outer circumferential direction of the concrete member. It may further include an internal recess.

9A to 9D show fitting members 80 and recesses 11 of various shapes.

<Example 2>

In this embodiment, the arrangement of the supporting member and the fastening member is different from that of the first embodiment, and the other components are the same as those of the first embodiment. Therefore, the same reference numerals are assigned to the same components as those of the first embodiment, and duplicate description thereof will be omitted.

Depending on the load condition applied to the member, it is necessary to reverse the arrangement of the tension member with the first embodiment. That is, when only local load is considered, it should be arranged as in Example 1, but when considering the load of the entire member, a load such as a bending load acts on the lower portion of FIG.

In this embodiment, as shown in Figure 6, the tightening member is disposed on both ends of the concrete member than the supporting member, the diameter of the circle connecting the center of the plurality of supporting holes of the supporting member is the tightening It is formed larger than the diameter of the circle which connects the center of the said several fastening hole of a member.

<Example 3>

In this embodiment, the configuration of the tightening member is different from the first and second embodiments, the other components are the same as the first embodiment. Therefore, the same reference numerals are assigned to the same components as those of the first embodiment, and duplicate description thereof will be omitted.

The tightening member 40 according to the present embodiment does not have a support. The tightening member 40 is composed of a tightening member body 41a, a tightening cutting portion 42a, and a tightening hole 43a.

The tightening member body 41a is disposed on the central axis of the concrete member, and is formed in a disc shape unlike the first embodiment. One end of the tightening cutting portion 42a is formed integrally with the tightening member main body and is provided in a plurality of radial portions, and a part of the tightening cutting portion 42a is embedded in the concrete member. The tightening cutting portion is formed with a tightening hole 43a formed in the tightening cutting portion and through which the tension member is inserted.

In addition, a concave groove 42b is formed in a portion which is not embedded in the tightening cut portion, and as described above in Example 1, the tightening cut portion of the prestressed concrete member, which has been centrifugally molded and cured, is cut out from the tension member. When the tension force is introduced into the concrete member, the tightening cut portion is more easily cut.

<Example 4>

In this embodiment, the arrangement of the tension member, the configuration of the support member and the tightening member is different from the first embodiment, the other components are the same as the first embodiment. Therefore, the same reference numerals are assigned to the same components as those of the first embodiment, and duplicate description thereof will be omitted.

As shown in FIGS. 7 and 8A and 8B, the prestressed concrete member according to the present embodiment includes a concrete member 10 having a central bean formed at the center thereof, and is installed in the concrete member and fixed to both ends of the concrete member. A plurality of tension members 20 for applying a tension force to the concrete member, the first support clamping combined member 60, and the second support clamping combined member 70 is composed of.

At both ends of the prestressed concrete member, when the tension member is overcoated or low-coated, such coated concrete may be broken, the prestressing force may not reach the desired tension force. Accordingly, a part of the plurality of tension members are tensioned at both ends of the concrete member in close proximity to the outer peripheral surface side of the concrete member, and the remainder of the plurality of tension members is close to the inner peripheral surface side of the concrete member at both ends of the concrete member. It is desirable to arrange so as to be in tension.

In the case of having such an arrangement of tension members, it is necessary to support and tighten both the tension member disposed close to the outer surface of the concrete member and the tension member disposed close to the inner circumferential surface side of the concrete member.

As shown in FIG. 8A, the first support clamping combined member 60 includes a hollow main disk-shaped first main body portion 61 having the same central axis as that of the concrete member and embedded in the concrete member; It is integrally formed on the outer circumferential surface of the first body portion 61 and integrally formed on the support portion 62 having a plurality of support holes 62a through which the tension member is inserted, and an inner circumferential surface of the first body portion 61. And a tightening portion 64 having a plurality of tightening holes 64a through which the tension member is inserted.

In addition, the first support clamping combined member is formed integrally with the first body portion and is further extended from the support portion is further provided with a support supporting portion 63 which is supported in contact with the inner surface of the mold of the prestressed concrete member do.

On the other hand, as shown in Fig. 8b, the second support clamping combined member 70 has the same central axis as the central axis of the concrete member, and a hollow disc-shaped second main body portion 71 embedded in the concrete member. A support portion 72 formed integrally with the outer circumferential surface of the second main body portion 71 and having a plurality of support holes 72a through which the tension member is inserted, and integral with the inner circumferential surface of the second main body portion 71. And a tightening portion 74 having a plurality of tightening holes 74a through which the tension member is inserted.

In addition, the second support and tightening member is formed integrally with the second body portion and is formed to extend further from the support portion and the second support supporting portion 73 is supported in contact with the inner surface of the mold of the prestressed concrete member It is further provided.

In addition, the width of the first body portion of the first support and tightening member is formed larger than the width of the second body portion of the second support and tightening member, the center of the support hole of the first support and tightening member The forming circle has a larger diameter than the circle formed by the center of the supporting hole of the second supporting tightening member, and the circle formed by the center of the tightening hole of the first supporting tightening member is a portion of the second supporting tightening member. It has a diameter smaller than the circle formed by the center of the tightening hole.

The tension member of the prestressed concrete member according to the present embodiment having the configuration as described above describes the arrangement and tension. The tension member close to the outer circumferential surface side of the concrete member penetrates the support hole of the first support clamping member and the tightening hole of the second support clamping member. On the other hand, the tension member close to the inner circumferential surface side of the concrete member penetrates the tightening hole of the first supporting clamping member and the supporting hole of the second supporting clamping member.

By constructing as described above, the tension member can be arranged in a zigzag shape in one prestressed concrete member, and in this case, even in a case where the prestressing force may not be reached due to overcoat or low coat, it can be more effectively coped with. .

BRIEF DESCRIPTION OF THE DRAWINGS The drawings attached to this specification clearly show some of the technical ideas included in the present invention, and modifications that can be easily inferred by those skilled in the art within the scope of the technical ideas included in the specification and drawings of the present invention. It is obvious that both and specific embodiments are included in the scope of the technical idea of the present invention.

1a and 1b is a view showing a prestressed concrete member according to the prior art.

2 is a view showing a prestressed concrete pile according to an embodiment of the present invention.

3 is a view showing an embodiment of the tightening member of FIG.

4 is a view showing a fastening member according to another embodiment.

5 is a view illustrating an embodiment of the support member of FIG. 2.

6 is a view showing a support member according to another embodiment.

7 is a view showing a prestressed concrete pile according to another embodiment of the present invention.

8 is a view showing a prestressed concrete pile according to another embodiment of the present invention.

9 is a view showing various appearance of the prestressed concrete pile according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: prestressed concrete member

10: concrete member

20: tension material

30: support member

40: fastening member

50: tension device

60: first support clamping combined use member

70: second support tightening member

Claims (15)

In the prestressed concrete member comprising a concrete member having a hole formed in the center and a plurality of tension members which are installed in the concrete member and fixed to both ends of the concrete member to apply tension to the concrete member, A support member having a plurality of support holes into which the plurality of tension materials are inserted, and for urging the tension members into which the tension force is introduced in the circumferential direction of the concrete member; The prestressed concrete member having a rational tension member arrangement further comprising a tightening member having a plurality of tightening holes into which the tension member is inserted, and for urging the tension member into which the tension force is introduced toward the central axis of the concrete member. 2. The prestressed concrete member according to claim 1, wherein the concrete member further includes a recess formed on the outer circumferential surface of the concrete member to be concave toward the central axis of the concrete member. The prestressed concrete member having a reasonable tension member according to claim 2, wherein the concrete member further includes an inner recess formed in a concave direction on the inner surface of the through hole formed in the outer circumferential direction of the concrete member. The method according to any one of claims 1 to 3, The support member is disposed on both ends of the concrete member than the tightening member, Prestressed concrete member having a reasonable tension arrangement, characterized in that the diameter of the circle connecting the center of the plurality of receiving holes of the support member is larger than the diameter of the circle connecting the center of the plurality of tightening holes of the tightening member. . The method according to any one of claims 1 to 3, The tightening member is disposed on both ends of the concrete member than the supporting member, Prestressed concrete member having a reasonable tension arrangement, characterized in that the diameter of the circle connecting the center of the plurality of receiving holes of the support member is larger than the diameter of the circle connecting the center of the plurality of tightening holes of the tightening member. . The method of claim 1, wherein the fastening member, A cylindrical fastening member body disposed on a central axis of the concrete member; One end is formed integrally with the tightening member main body and provided with a plurality of radially tightening cutting portion is embedded in the concrete member; A tightening hole formed in the tightening cutting portion and through which the tension member is inserted; The prestressed concrete member having a reasonable tension member arrangement, characterized in that it is provided at the other end of the tightening cut portion is provided with a support portion which is supported in contact with the inner surface of the mold of the prestressed concrete member. The method of claim 1, wherein the fastening member, A disk-shaped tightening member body disposed on the central axis of the concrete member; One end is formed integrally with the tightening member main body and provided with a plurality of radially tightening cutting portion is embedded in the concrete member; The prestressed concrete member having a reasonable tension member arrangement, characterized in that it is provided in the tightening cutting portion having a tightening hole through which the tension member is inserted. 8. The prestressed concrete member according to claim 6 or 7, wherein a concave groove is formed in a portion which is not embedded in the tightening cut portion. The method of claim 1, wherein the support member, A support member body having a hollow disc shape having the same central axis as the central axis of the concrete member and embedded in the concrete member; A support hole formed in the support member main body and through which the tension member is inserted; Prestressed concrete member having a rational tension member arrangement on the outer circumferential surface of the support member body integrally formed with the support member body and having a support portion which is supported against the inner surface of the mold of the prestressed concrete member. In the prestressed concrete member comprising a concrete member having a bean in the center and a plurality of tension members installed in the concrete member and fixed to both ends of the concrete member to apply tension to the concrete member, Some of the plurality of tension members are tensioned at both ends of the concrete member in proximity to the outer peripheral surface side of the concrete member, and the rest of the plurality of tension members are tensioned at both ends of the concrete member in proximity to the inner peripheral surface side of the concrete member. , A hollow body having a central axis identical to the central axis of the concrete member and embedded in the concrete member, and a plurality of supporting holes formed integrally with the outer circumferential surface of the first body portion and through which the tension member is inserted. A first support clamping member having a first support portion and a first tightening portion integrally formed on an inner circumferential surface of the first body portion and having a plurality of tightening holes through which the tension member is inserted; A second main body having a hollow disc shape embedded in the concrete member and having the same central axis as the central axis of the concrete member, and a plurality of supporting holes formed integrally with the outer peripheral surface of the second body portion and through which the tension member is inserted are formed. And a second supporting fastening member having a second supporting part and a second fastening part integrally formed on the inner circumferential surface of the second main body and having a plurality of tightening holes through which the tension member is inserted. Prestressed concrete member with tensioning arrangement. The method of claim 10, The first support and tightening member and the second support and tightening member is formed integrally with the first and second body portion and further comprising a support for supporting the inner surface of the mold of the prestressed concrete member is supported A prestressed concrete member having a reasonable tensioning arrangement. The method of claim 10 or 11, The circle formed by the center of the support hole of the first support tightening member has a diameter larger than the circle formed by the center of the support hole of the second support tightening member, The circle formed by the center of the tightening hole of the first support tightening member has a diameter smaller than the circle formed by the center of the tightening hole of the second support tightening member; . The method of claim 12, The tension member proximate to the outer circumferential surface side of the concrete member penetrates the support hole of the first support clamping member and the tightening hole of the second support clamping member, The tension member proximate to the inner circumferential surface side of the concrete member is a prestressed concrete member having a reasonable tension member arrangement, characterized in that through the tightening hole of the first support clamping member and the support hole of the second support clamping member. . The method of claim 10, The concrete member is prestressed concrete member having a reasonable tension material arrangement, characterized in that further comprising a concave formed on the outer peripheral surface concave toward the central axis direction of the concrete member. The method of claim 14, The concrete member is a prestressed concrete member having a reasonable tension material arrangement, characterized in that further comprising an inner recess formed in the concave toward the outer circumferential direction of the concrete member on the inner surface in which the through hole is formed.

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