JPH11210162A - Structure of installing rustproof pc steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure which, when a rustproof PC steel is longitudinally curved and installed in the structure of a pier girder or the like, a cover of a synthetic resin on the outer periphery of the rustproof PC steel can be protected so that it is not damaged by collision with a binding part (binding member or curved part of steel through hole) secured to the structure. SOLUTION: Two split members each having a U-shaped cross section are mounted on the outer periphery of the middle of a rustproof PC steel 10 while sandwiching the rustproof PC steel 10, to form an inner periphery protection member 11 of an annular cross section. A lubricant is applied to the outer peripheral surface of the inner periphery protection member 11 to form a lubricant layer 12, Two spit members 13a, 13b each having a U-shaped cross section are mounted on the outer periphery of the inner periphery protection member 11 while sandwiching the inner periphery protection member 11, to form an outer periphery protection member 13 of an annular cross section. The rustproof PC steel 10 is longitudinally curved and installed in such a manner that the outer periphery protection member 13 is made to abut to the binding part of a structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rust-proof PC in which the outer periphery is covered with a synthetic resin on a structure such as a bridge girder such as an outer cable (out cable) or a post tension system.
A rust-proof PC in which a steel material is installed by bending the steel in the longitudinal direction by contacting the outer peripheral side of the intermediate portion with the restraining portion fixed to the structure.
Related to steel installation structure.

[0002]

2. Description of the Related Art When installing a PC steel material on a structure such as a bridge girder, the PC steel material is bent in the longitudinal direction and installed.
In the case of an external cable or a post-tension method, the outer peripheral side of the middle part of the rust-proof PC steel is brought into contact with a restraining portion (bending portion of a restraining material or a steel material insertion hole) fixed to a structure, and is bent in a longitudinal direction. Conventionally, the coating of the outer periphery of the rust-proof PC steel material with the synthetic resin has been directly brought into contact with the restraining portion.

[0003] For example, in the case of an outer cable, as shown in FIG.
3 and the outer peripheral side of the intermediate portion is brought into contact with the restraint members 5 and 5 (restricted portions) fixed to the structure 1 to bend in the longitudinal direction and out of the cross section of the structure 1. Conventionally, the coating of the synthetic resin on the outer periphery of the rust-proof PC steel 10 was directly brought into contact with the restraining members 5 and 5.

[0004]

A structure such as a bridge girder is deformed due to a change in the applied load, and the outer peripheral side of the rust-proof PC steel repeatedly collides with the restraint portion of the structure. Therefore, as described above, when the coating of the synthetic resin on the outer periphery of the rust-preventive PC steel material is directly brought into contact with the constrained portion of the structure, the synthetic resin coating is damaged by the collision with the constrained portion, and the rust-proof PC steel material is damaged. There was a problem that rust prevention performance was reduced.

The present invention has been made in view of such a conventional problem,
Rust prevention P for external cable, post tension system, etc.
It is an object of the present invention to provide a rust-proof PC steel installation structure capable of suitably protecting the outer periphery of a C steel material with a synthetic resin coating.

[0006]

SUMMARY OF THE INVENTION The features of the present invention for solving the conventional problems as described above and achieving the intended purpose are as follows.
A structure such as a bridge girder is provided with a rust-proof PC steel material whose outer periphery is covered with a synthetic resin, by contacting the outer peripheral side of the intermediate portion to a restraining portion fixed to the structure, and bending in the longitudinal direction. In the rust-preventive PC steel installation structure to be installed, the protective sheath formed in a double cylindrical shape with an inner circumferential protective material having an annular cross section, an outer protective material having an annular cross section, and a lubricating layer sandwiched between the two is provided. The rust PC steel material is attached to the outer periphery of an intermediate portion, and the outer protective material of the protective sheath is brought into contact with the restraining portion.

[0007] The inner circumferential protective member is constituted by two divided members having a U-shaped cross section which are mounted by sandwiching the rust-preventive PC steel material from the outer circumferential side. It is preferable to have two U-shaped cross-section members that are sandwiched and mounted from the outer peripheral side.

Preferably, the lubricating layer comprises a lubricant applied to the outer peripheral surface of the inner peripheral protective material. Alternatively, it is preferable that a lubricant injection hole is provided in the outer peripheral protection material, and the lubrication layer is formed of a lubricant injected from the lubricant injection hole.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 4 show a first embodiment of the present invention, and show a case of an external cable.

In FIG. 1, reference numeral 1 denotes a concrete structure such as a bridge girder, and reference numeral 10 denotes a rust-preventive PC steel material for applying a prestress to the structure 1. The cross section of the structure 1 is fixed to the structure 1 by 3 and 3, and the outer peripheral side of the intermediate portion is brought into contact with the restraint members 5 and 5 (restricted portions) fixed to the structure 1 and curved in the longitudinal direction. Installed outside.

[0011] As shown in FIG.
Are formed by twisting a plurality of PC steel wires 10a, 10a,..., And a coating 10b of a synthetic resin is formed on the outer periphery thereof to form a circular cross section. Further, the inside of the rust-proof PC steel material 10 is also filled with a synthetic resin between the PC steel wires 10a, 10a,.

A plurality of protective sheaths (13, 13) are mounted on the outer periphery of the intermediate portion of the rust-preventive PC steel material 10 in an arrangement corresponding to the arrangement of the restraining members 5, 5, as shown in FIG. As shown in FIGS. 3 and 4, each protective sheath is provided on an outer periphery of a rust-proof PC steel material 10 with an inner peripheral protective material 11 having an annular cross section.
Is mounted on the outer circumference of the inner circumference protection material 11 and the outer circumference protection material 13 having an annular cross section is sandwiched with the lubricating layer 12 therebetween. In addition, the inner circumference protection material 1
1. The outer circumferential protective material 13 is formed thin with a flexible synthetic resin.

[0013] As shown in FIG.
The rust-preventive PC steel 10 is sandwiched between the divided members 11a and 11b from the outer peripheral side, and the connecting tapes 11c and 11c are straddled over the edges of the two members. These are connected to each other in a cylindrical shape in the form of bonding, and are mounted on the outer periphery of the rust-proof PC steel material 10. Note that a lubricant such as oil may be applied to the outer peripheral surface of the rust-proof PC steel material 10.

[0014] Then, as shown in FIG.
By applying a lubricant such as oil to the outer peripheral surface of 1,
A lubrication layer 12 is formed. The outer protective material 13 is, like the inner protective material 11, made of two divided members 1 having a U-shaped cross section.
3a, 13b, and the divided member 13
The inner peripheral protective material 11 is sandwiched between the outer peripheral side by a and 13b, and the two are connected in a cylindrical shape so that the connecting tapes 13c and 13c are adhered over the edges of the inner peripheral protective material 11. It is attached to the outer periphery of.

Therefore, the protective sheath composed of the inner circumferential protective material 11, the lubricating layer 12, and the outer circumferential protective material 13 is provided between the long rust-proof PC steel material 10 and the long rust-proof PC steel material 10 in accordance with the arrangement of the restraining members 5 and 5 of the structure 1. The parts can be suitably mounted in any arrangement.

As shown in FIG. 1, the rust-preventive PC steel material 10 is formed by connecting the outer circumferential protective members 13 and 13 of the protective sheath to the structure 1.
Are placed in contact with the restraining members 5, 5. Therefore,
The coating 10b of the synthetic resin on the outer periphery of the rust-proof PC steel 10 does not come into contact with the restraining members 5, 5 of the structure 1, and the structure 1 is deformed due to a change in the load and the outer periphery of the rust-proof PC steel 10 Even if the restraint members 5 and 5 repeatedly collide, the outer coating 10b can be prevented from being damaged, and the rust-preventive performance of the rust-proof PC steel material 10 can be maintained for a long time.

FIG. 5 shows a second embodiment of the present invention, in which a post-tension system is used. The description of the same parts as those in the first embodiment is omitted, and the same reference numerals are used.

The rust-proof PC steel material 10 is inserted into a steel material insertion hole 7 drilled in the longitudinal direction of the concrete structure 1, and the outer peripheral side of the intermediate portion is bent at the bent portions 8, 8 of the steel material insertion hole 7.
(Constrained portion), and is curved in the longitudinal direction to
It is installed in the cross section of. And rust-proof PC steel 10
On the outer periphery of the middle part of the inner peripheral protection member 11, the lubrication layer 12, and the outer peripheral protection member 1
A double-cylindrical protective sheath 3 is attached, and outer protective members 13 of the protective sheath are in contact with the bent portions 8.

Therefore, the coating 10b of the synthetic resin on the outer periphery of the rust-preventive PC steel material 10 does not come into contact with the bent portions 8 of the structure 1,
The structure 1 is deformed due to the change of the applied load and the rust-proof PC steel 1
Even if the outer peripheral side of 0 and the bent portions 8 and 8 repeatedly collide, the outer peripheral coating 10b can be prevented from being damaged, and the rust-preventive performance of the rust-resistant PC steel material 10 is maintained for a long time. be able to.

Before inserting the rust-preventive PC steel material 10 into the steel material insertion hole 7 of the structure 1, the inner circumferential protective material 11, the lubricating layer 12
By fixing the protective sheath made of the outer protective material 13 to a predetermined position of the rust-preventive PC steel material 10 by taping or the like, the position of the protective sheath can be suitably prevented from being shifted during the insertion work of the rust-preventive PC steel material 10. can do.

In the above-described embodiment, the inner and outer protective members are each constituted by two divided members having a U-shaped cross section, and the two divided members are connected to form an annular cross section. Although the above description has been made, the inner circumferential protective material or the outer circumferential protective material may be formed integrally with the annular cross section.

Further, in the above-described embodiment, a case has been described in which a lubricant is applied to the outer peripheral surface of the inner peripheral protective member to form a lubricating layer between the inner peripheral protective member and the outer peripheral protective member. A lubricant injection hole (oil injection nipple) may be provided in the outer protective material, and a lubricant may be injected from the lubricant injection hole to form a lubricating layer between the inner protective material and the outer protective material.

Further, in the above-described embodiment, the case where the rust-preventive PC steel material is constituted by a steel stranded wire obtained by twisting a plurality of steel wires has been described. Instead, a single steel wire, a steel wire bundle, a steel stranded wire bundle, or the like may be used.

In the above-described embodiment, the case where the structure on which the rust-preventing PC steel material is installed is made of concrete is described. However, the structure on which the rust-preventing PC steel material is installed is not limited to the concrete structure. Or a steel structure.

[0025]

As described above, the rust-preventive PC steel installation structure according to the present invention provides a rust-proof P steel having an outer periphery covered with a synthetic resin.
At the outer periphery of the intermediate portion of the C steel material, a protective sheath formed in a double cylindrical shape with an inner protective material having an annular cross section, an outer protective material having an annular cross section, and a lubricating layer sandwiched therebetween is attached to protect. The outer protective material of the sheath is brought into contact with the restraining part fixed to the structure, and the rust-proof PC steel is curved and installed in the longitudinal direction. Even if the outer peripheral side and the restraint portion repeatedly collide, the coating of the synthetic resin can be prevented from being damaged, and therefore, the rust-preventive performance of the rust-preventive PC steel material can be maintained for a long period of time.

Further, the inner periphery protection member is constituted by two divided members having a U-shaped cross section which are mounted by sandwiching the rust-preventive PC steel from the outer periphery side. By using two U-shaped cross sections that are sandwiched from the side and mounted, the inner and outer protective materials can be extended according to the arrangement of the restraining parts of the structure. It can be suitably mounted on any arrangement of PC steel.

Incidentally, the lubricating layer can be suitably formed by applying a lubricant to the outer peripheral surface of the inner peripheral protective material. Further, the lubricating layer can also be suitably configured by providing a lubricant injection hole in the outer circumferential protective material and injecting a lubricant from the lubricant injection hole.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a first embodiment of a rustproof PC steel installation structure according to the present invention, showing an external cable.

FIG. 2 is a cross-sectional view of the rust-proof PC steel material in FIG.

FIG. 3 is a cross-sectional view showing a structure for mounting an inner peripheral protection member on the outer periphery of the rust-proof PC steel material of FIG. 2;

FIG. 4 is a cross-sectional view showing a mounting structure of an outer peripheral protection member on an outer periphery of the inner peripheral protection member of FIG. 3;

FIG. 5 is an elevational view showing a second embodiment of the rustproof PC steel installation structure according to the present invention, showing a case of a post-tension system.

FIG. 6 is an elevational view showing an example of a conventional rust-proof PC steel material installation structure, showing an external cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure 3 Fixing material 5 Restriction material (restraint part) 7 Steel material insertion hole 8 Bent part (restriction part) 10 Rust prevention PC steel material 10a PC steel wire 10b Coating 11 Inner circumference protection materials 11a, 11b Division member 11c Connection tape 12 Lubrication Layer 13 Peripheral protective material 13a, 13b Dividing member 13c Connecting tape

Claims (4)

[Claims] A rust-proof PC steel material whose outer periphery is covered with a synthetic resin is brought into contact with a structure such as a bridge girder in such a manner that an outer peripheral side of an intermediate portion is brought into contact with a restraining portion fixed to the structure, thereby forming a longitudinal structure. Anti-corrosion PC steel installation structure that is curved and installed in the direction, protection formed in a double cylindrical shape with an inner circumference protection material with an annular cross section, an outer protection material with an annular cross section, and a lubricating layer sandwiched between them A rustproof PC steel installation structure, wherein a sheath is attached to an outer circumference of an intermediate portion of the rustproof PC steel material, and the outer circumferential protective material of the protective sheath is brought into contact with the restraining portion. 2. The inner periphery protection member is constituted by two divided members having a U-shaped cross section which are mounted by sandwiching a rust-prevention PC steel from the outer periphery side. 2. The rust-proof PC steel installation structure according to claim 1, comprising two divided members having a U-shaped cross section that are sandwiched and mounted from the outer peripheral side. 3. The rust-proof PC steel installation structure according to claim 1, wherein the lubricating layer comprises a lubricant applied to the outer peripheral surface of the inner peripheral protective material. 4. A lubricant injection hole is provided in the outer peripheral protection material,
The rust-proof PC steel installation structure according to claim 1 or 2, wherein the lubricating layer is formed of a lubricant injected from the lubricant injection hole.