JPH09105207A - Tensor fixing device - Google Patents

Abstract

(57) [Summary] (Correction) [Problem] To improve the fixing performance and yield strength of a sleeve. SOLUTION: In a fixing tool 1, 10 which is fitted to an end portion of a tension material a such as a fiber composite cable, in which a filler g is injected and solidified and fixed, a thermosetting system containing an aggregate is fixed. Alternatively, a cylindrical non-metallic sleeve 2 is formed from cement-based fluid mortar 2a, and high strength and low elongation fiber-based ring-shaped streaks 3 and 4 are formed on the hole 2b surface side and the middle layer of the non-metallic sleeve.
Are embedded and reinforced, and a plurality of similar fiber-type axial ridges 5 are embedded and reinforced in the middle layer of the non-metallic sleeve with a circumferential spacing at intervals. In addition, the ring-shaped streak 3 buried in the hole 2b surface side of the non-metallic sleeve forms the anti-friction inner layer 3a mainly with the filler, and the ring-shaped streak 4 buried in the middle layer of the non-metallic sleeve expands in proof stress and rigidity. The reinforcing middle layer 4a is formed, and the axial rigidity / proof strength reinforcing layer 5a is formed by the axial streaks 5 embedded in the middle layer of the non-metal sleeve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various types of high-strength / low-strength fiber cables, wire ropes, steel rods, etc. suitable for terminal anchoring in structures such as prestressed concrete. It relates to a fixing device for a material.

[0002]

2. Description of the Related Art When embedding various high-strength, low-stretch fiber cables or wire ropes (tensiles) in structures such as prestressed concrete for reinforcement, steel sleeves are attached to the ends of these tensions. A fixing tool is generally used in which the filler is fitted and the filler is injected and fixed in the steel sleeve, but the steel sleeve requires anticorrosion treatment. Further, when a stainless steel sleeve having excellent corrosion resistance, strength and fatigue resistance is used, there is a problem that workability is poor and cost is high.

In recent years, a fiber cable of high strength, low elongation, light weight, high corrosion resistance and non-magnetic material has been applied as a tension material. Along with this, a similar material is required for this fixing device. Therefore, development of a non-metallic sleeve made of fiber reinforced resin is being considered.

[0004]

In a conventional fixing member for a tension member, the non-metal sleeve made of fiber reinforced resin has characteristics such as high corrosion resistance and non-magnetic property, but the frictional force with the filler, that is, the tension. It is difficult to secure the fixing force corresponding to the material, and it is easy to deform due to variations in strength, lack of rigidity, etc.
There are issues with the fixing performance, rigidity, durability, etc., that correspond to tension materials.

The present invention was developed in order to solve the above-mentioned problems, and its object is to provide a non-metal sleeve made of aggregate-containing thermosetting resin-based mortar or cement-based mortar. Has a high strength and low elongation fiber type ring-shaped muscle as a multi-layer and embeds and reinforces a similar fiber type axial direction muscle group, expansion pressure resistance, adhesion with tension material, axial rigidity, durability etc. And high corrosion resistance, non-magnetic, etc. as well as fixing performance,
It is to provide a fixing member for a tension material with improved reliability.

[0006]

SUMMARY OF THE INVENTION The present invention is a fixing tool which is fitted to the end of a tension material such as a fiber composite cable, in which a filler is injected and solidified and fixed. Non-metal sleeve made of curable resin type (thermosetting resin type with epoxy resin mixed with silica stone powder, silica sand, etc.) or cement type fluid mortar, basically improving the yield strength and toughness of the non-metal sleeve. By the inner layer of anti-friction reinforcement formed by ring-shaped streaks of high strength and low elongation fiber embedded in the hole surface side, mainly the friction force with the filler, that is, the sleeve fixing force,
Expansion proof strength / rigidity reinforcement formed by similar ring-shaped streaks embedded in the middle layer. The expansion resistance and rigidity of the non-metallic sleeve are increased by the middle layer, and the axial direction formed by the similar axial streaks embedded in the middle layer. The rigidity / proof strength reinforcement layer enhances the axial rigidity and yield strength of the non-metallic sleeve, and the increase and decrease of the ring-shaped and axial-direction streaks enables the characteristic adjustment corresponding to the tension material. In addition to high corrosion resistance, non-magnetic property, etc., it effectively enhances expansion pressure resistance, fixing force with tension material, axial rigidity, durability, etc., and has excellent fixing performance and reliability.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment of the present invention, and FIG.
FIG. 3 shows a second embodiment, FIGS. 3A to 3F show each modification, and FIG. 4 shows a fixing mode. In FIGS. 1 and 2, 1 and 10 are fixing devices of the first and second embodiments, and 2 is a non-metal formed of a fluid mortar 2a of thermosetting resin mortar or cement mortar mixed with aggregate. Sleeves 2b are holes in the non-metallic sleeve, 3 are ring-shaped streaks embedded in the hole surface side of the non-metallic sleeve, 3a is an anti-friction inner layer formed by the ring-shaped streaks 3,
4 is a ring-shaped streak embedded in the middle layer of the non-metal sleeve, 4
a is an expansion proof strength / rigidity reinforcing middle layer formed by the ring-shaped streaks 4,
5 is an axial direction streak (a group of axial streaks) embedded in the middle layer of the non-metal sleeve, 5a is an axial rigidity formed by the axial streak group 5.
Strength-reinforcing middle layer, 6 is a ring-shaped reinforcement embedded in the outer peripheral portion of the non-metallic sleeve, 6a is a strength- and toughness-enhancing outer layer formed by the ring-shaped reinforcement 6, a is a tension material such as a fiber-composite cable, wire rope or steel rod, g is a filler injected into the hole of the non-metallic sleeve.

The first embodiment shown in FIG. 1 is a fixing device which is fitted to the end of a tension material a such as a fiber composite cable, in which a filler g is injected and solidified and fixed. The non-metallic sleeve 2 is formed from the thermosetting resin-based or cement-based fluid mortar 2a, and the high-strength / low-extension fiber-based ring-shaped streak 3 is formed on the hole 2b surface side and the middle layer portion of the non-metallic sleeve 2. And 4 are embedded and reinforced in multiple layers, and non-metallic sleeve 2
In the middle layer portion, a plurality of similar fiber-shaped axial streaks 5 are embedded and reinforced by embedding and reinforcing them in axial direction streak groups 5 at circumferential intervals.

Further, in the fixing member for the tension member, the ring-shaped streak 3 buried in the hole 2b surface side of the non-metal sleeve 2 forms the anti-friction inner layer 3a with the filler g, and the non-metal sleeve is formed. The ring-shaped streak 4 embedded in the middle layer 2 forms the expansion strength / rigidity reinforcing middle layer 4a, and the axial streak group 5 buried in the middle layer of the non-metal sleeve 2 forms the axial rigidity / strength reinforcing layer 5a. It is used as a fixing material for tension materials.

Further, in the above-mentioned tension member fixing device, the non-metal sleeve 2 is formed of a thermosetting resin mortar 2a in which an aggregate such as silica stone powder and silica sand is mixed in an epoxy resin. It has become a fixing material for tension materials.

Further, the second embodiment shown in FIG. 2 is a fixing tool which is fitted to the end portion of a tension member a such as a fiber composite cable, in which a filler g is injected and solidified and fixed. Thermosetting resin mortar 2a mixed with non-metallic sleeve 2
And forming and reinforcing the ring-shaped streaks 3 and 4 and 6 of high strength and low elongation fiber system in the hole 2b surface side of the non-metal sleeve 2 and in the middle layer and the outer peripheral portion, and forming the middle layer of the non-metal sleeve 2. The fiber-shaped shaft fixing device 10 is similar to the above. Further, in this fixing tool 10, the ring-shaped streaks 6 form a proof / toughness reinforcing outer layer 6a.

More specifically, the non-metal sleeve 2 is
Thermosetting resin-based mortar in which non-metallic aggregate is appropriately mixed with various thermosetting resins for reinforcement, or fluid mortar 2a of various cement-based mortar in which non-metallic aggregate is appropriately mixed. Is formed into a cylindrical shape with an inner diameter of this hole 2a,
A suitable filler g around the tension material a corresponding to the diameter of the tension material a.
Set to form a filling area of In the fluid mortar 2a, the thermosetting resin-based mortar 2a is preferably a mortar in which silica stone powder and silica sand are mixed as an aggregate in an epoxy resin, and preferably epoxy resin: silica: silica sand = 1: The composition is applied in a composition (weight ratio) of 1.8: 1, and it is also possible to adopt a composition in which an aggregate is mixed with various similar thermosetting resins. Further, the cement-based mortar is composed of various known cement-based materials and aggregates (specific examples are omitted).

The ring-shaped streaks 3, 4, 6 and the axial streaks 5 are made of various high strength / low elongation fibers (long fiber or short fiber) such as carbon fiber or a plurality of strands. It is composed of twisted fiber composite cables, etc., and for the ring-shaped reinforcements 3, 4 and 6, a spiral reinforcement having a ring function, a large number of ring reinforcements or a tubular sheet woven in the longitudinal and transverse directions is applied. At the time of molding the non-metal sleeve 2, the wall surface of the hole 2b is evenly arranged over the entire circumference and the entire length thereof, and the non-metal sleeve 2 is appropriately embedded and reinforced in the fluid mortar 2a on the wall surface of the hole. The friction-reinforcement inner layer 3a that effectively strengthens the frictional force between the inner surface and the filling material g, that is, the fixing force with the tension material a is uniformly formed over the entire circumference and the entire length.

Further, the ring-shaped streak 4 is made of a high-strength material which is comparative to the ring-shaped streak 3, and when the non-metal sleeve 2 is molded, the ring-shaped streak 4 is uniformly arranged over the entire circumference and the entire length of the non-metal sleeve 2 so as to have fluidity. The mortar 2a is embedded in the mortar 2a to reinforce it, and the expansion resistance and rigidity of the non-metal sleeve 2 is strengthened.
As a whole, it is evenly formed over the entire length.

The ring-shaped streak 6 is made up of the non-metal sleeve 2
At the time of molding, the outer peripheral portion is evenly arranged along the entire circumference, and if necessary, the central portion of the non-metal sleeve 2 is arranged with an appropriate axial interval (see FIG. 2) to be placed in the fluid mortar 2a. It is embedded and integrated and reinforced to form a proof and toughness reinforcing outer layer 6a.

Further, the axial streaks 5 are non-metallic sleeves 2.
When molding, a plurality of pieces are arranged in the middle layer portion at intervals in the circumferential direction and are evenly arranged over the entire circumference and the entire length.
Embedded in the fluid mortar 2a and integrated to reinforce,
An axial rigidity / proof strength reinforcing layer 5a is formed which effectively enhances the rigidity and yield strength of the non-metallic sleeve 2 in the axial direction.

As the filler g, an expansive material such as cement containing lime and silicate as a main component is preferably applied, and an adhesive such as an epoxy resin can also be applied, which is fitted to the end portion of the tension material a. When injected into the hole 2b of the mounted non-metallic sleeve 2, the expansive material expands and fills the hole, penetrates into the tension material a and solidifies, and the non-metal sleeve 2 is strongly fixed to the end portion of the tension material. To do. Further, an adhesive such as an epoxy resin can be pressed into the hole to obtain the same fixing performance.

In each of the sectional views shown in FIG. 3, FIG. 3A shows a fixing tool 1 corresponding to the first embodiment of FIG. 1. The fixing tool 1 has a basic structure, and the number of axial stripes 5 is doubled (12). The fixing tool 1a (see FIG. 3B), the fixing tool 1b (see FIG. 3C) in which the total cross-sectional area of the axial streaks 5 is doubled (the diameter is 5.0 to 7.5 mmφ), and the axial streaks 5 are Fixing tool 1c with total cross-sectional area increased by 5 times (diameter: 5.0 to 12.5 mmφ)
(See FIG. 3D) is a modified example showing a fixing tool 1d (see FIG. 3E) in which the axial streaks 5 are rearranged between the ring-shaped streaks 3 and 4, and the plurality of axial streaks 5 are ring-shaped. It is formed in a modified example (not shown) including a multi-layer axial muscle group 5 arranged on the inner and outer sides of the muscle 4. Further, FIG. 3F shows a fixing tool 10 corresponding to the second embodiment of FIG. Furthermore, various structures are implemented in correspondence with the tension material a.

In the fixing device of each of the above-described embodiments and its modification, the non-metal sleeve 2 is fitted to the end portion of the tension member a as shown in FIG. 1 or 2, and the non-metal sleeve is expanded into the non-metal sleeve. A filling material g such as a material is injected to fill the inside of the hole 2b so as to penetrate into the tension material and solidify, and the non-metal sleeve is strongly fixed to the end portion of the tension material a through the filling material. As shown in FIG. 4, the tension member a is inserted into a structure such as prestressed concrete and pulled by an appropriate means to apply a predetermined tension force to the tension member, and the non-metallic sleeve 2 is pressed against the pressure plate 20 to be fixed. Tension material is stretched by the mouth fixing method.

The fixing tool 1 according to the first embodiment has a basic structure, and is a mortar (compressive strength 1 which is mixed with silica resin powder and silica sand as an aggregate in an epoxy resin at the above-mentioned compounding ratio.
164 kgf / cm ² , elastic coefficient 9.44 × 10 ⁴ kg
The non-metallic sleeve 2 is formed by f / cm ² ) and at the time of this molding, the carbon fiber ring-shaped streaks 3 (3.0 mmφ) and ring-shaped streaks 4 (5.0
mmφ) is embedded in two layers for reinforcement, and 6 axial streaks 5
(5.0 mmφ) embedded and reinforced fixing tool 1 (Fig. 3A)
As a result, the non-metal sleeve was found to have an expansion pressure of 1000 kgf / cm ² of the expansion material (filler).
It was confirmed that the expansion pressure resistance (restraint degree) of about 8 times was obtained.

The fixing device 1 (see FIG. 3A) is
The axial muscle ratio of the six axial muscles 5 (total cross-sectional area of axial muscles / sleeve cross-sectional area) is 2.22%, and there are 12 axial muscles, which is double the axial muscle ratio of 4.45. Fixing tool 1a in%
(See FIG. 3B), 6 axial streaks from 5.0 to 7.5 m
Fixing tool 1b with mφ set to double the axial streak ratio of 4.45% (see FIG. 3C), and fixing tool 1c with axial streaks of 5.0 to 12.5 mmφ and a 5-fold axial streak ratio of 11.11% (See FIG. 3D), the fixing tool 1d (see FIG. 3E) in which axial streaks are arranged between the ring-shaped streaks 3 and 4, and the ring-shaped streaks 6 are newly arranged on the outer peripheral side to set the axial streak ratio of 2.22. % Fixing device 10 (see FIG. 3F) was manufactured, a compression test was performed using each of them as a test sample, and an experiment was performed on the axial proof stress and deformation behavior.
And a characteristic diagram of the relationship between compressive load and strain shown in FIG. 7 (measure the axial strain εz and the circumferential strain εθ with a biaxial strain gauge attached to the front and back of the center of the specimen), and the axis shown in FIG. The relationship characteristic diagram between the muscle ratio and the compression elastic modulus (the compression elastic modulus was calculated from the axial strain at the compression loads of 5 tf and 20 tf) and the like were obtained.

As is clear from the characteristic diagram of FIG. 5, even if the muscle mass of the axial muscle (axial muscle ratio) is increased, the compressive strength does not change significantly, whereas from the characteristic diagram of FIG. The elastic modulus of compression increases almost in proportion to the muscle ratio. That is, the proof strength and rigidity in the axial direction are increased by the amount of muscle in the axial direction. Further, from the characteristic diagram of FIG. 7, the compression strength is increased by the reinforcement of the ring-shaped muscles 6 on the outer peripheral side, and a tenacious behavior is exhibited, which is effective in improving the strength and the toughness. Further, as is clear from the characteristic diagram of the relationship between creep strain and elapsed time in Fig. 8, the creep strain becomes smaller as the muscle capacity of the axial muscle (axial muscle ratio) is increased with basically sufficient proof stress. It was confirmed that the axial streak and this streak amount greatly affect the creep deformation due to the axial load, and even if the long-term deformation is large only with the fluid mortar mixed with the aggregate as described above, the fiber system as described above It was evaluated that the durability was sufficiently secured as a fixing tool by embedding the reinforcing bar.

Further, for example, three ring-shaped streaks (3.0 mmφ, 5.0 mmφ, 3.
0 mmφ) as three layers and six axial streaks (7.5 mmφ-axis streak ratio 4.45%) formed of the same fiber system were embedded, and the fixing tool corresponding to FIG. 2 was twisted with carbon fiber. 1 x 7
A plurality of specimens, which are fitted to a tension member having a structure (12.5 mmφ) and injected with an expansion material, are fixed to each other, and the specimen is arranged on a pressure plate 20 as shown in FIG. As a result of applying a tensile force F to the tensile test, it was confirmed that there was no particular damage before the tension member was broken and that the tension member did not come out. In addition, as a result of producing a number of specimens with a corresponding fixing device fixed to the tension material and performing the same tensile test, it was confirmed that similar evaluation was obtained and excellent fixing performance and reliability were obtained. doing.

According to the above-described structure and test, the thermosetting resin-based or cement-based flowable mortar mixed with aggregate 2
The non-metal sleeve 2 made of a (epoxy resin mixed with silica stone powder, silica sand, etc.) basically enhances the yield strength and toughness of the non-metal sleeve, and is relatively strong and elastic against acids, alkalis, and ultraviolet rays. It has durability such as no significant change in the coefficient. Further, the reinforcing inner layer portion 3a formed by the ring-shaped streaks 3 on the surface side of the hole 2b mainly increases the frictional force with the filling material g, that is, the sleeve fixing force, and effectively functions also for the expansion resistance, and the ring-shaped portion of the middle layer portion. The reinforcing middle layer portion 4a formed by the streaks 4 enhances the expansion resistance and rigidity of the non-metal sleeve, and the reinforcement layer portion 5a formed by the axial direction muscle group 5 of the middle layer portion increases the rigidity and strength in the sleeve axial direction. Furthermore, it is possible to adjust the characteristics corresponding to the tension material by increasing or decreasing the ring-shaped muscles and axial muscles, etc., such as high corrosion resistance, non-magnetic and expansion pressure resistance, adhesion force with the tension material, axial direction The rigidity, durability, etc. are effectively improved, and the fixing performance and reliability of the tension material are remarkably improved.

The fixing device described above can be applied not only to the various fiber cables as described above but also to the terminal fixing of various wire ropes, steel rods and the like. Also, the axial muscle groups can be embedded in multiple layers as needed to further enhance this characteristic.

[0026]

Industrial Applicability The present invention is a fixing tool which is constructed as described above and is fitted to the end portion of a tension material such as a fiber composite cable, in which a filler is injected and solidified and fixed. By forming the non-metal sleeve with thermosetting resin-based or cement-based fluid mortar (mortar in which aggregates such as silica stone powder and silica sand are mixed in epoxy resin), the yield strength of the non-metal sleeve is basically And the toughness are increased, and the friction-reinforcing inner layer formed by the ring-shaped streaks on the hole surface side mainly increases the frictional force with the filler, that is, the sleeve fixing force, and the expansion resistance and rigidity reinforcement formed by the ring-shaped streaks in the middle layer. The middle layer enhances the expansion resistance and rigidity of the non-metallic sleeve, and the axial rigidity and strength reinforcement layer formed by the axial muscle groups in the middle layer enhances the rigidity and strength in the axial direction of the sleeve. And increase or decrease of axial muscle It is possible to adjust the characteristics corresponding to the tension material by using, such as high corrosion resistance, non-magnetic property, etc., to effectively increase the expansion pressure resistance, the adhesion force to the tension material, the axial rigidity and the durability, etc. The fixing performance and reliability of the material are significantly improved.

[Brief description of the drawings]

FIG. 1 is a sectional view (A) and an end view (B) showing a metal sleeve of a first embodiment of the present invention.

FIG. 2 is a sectional view showing a metal sleeve of a second embodiment (A).
And its end view (B)

FIG. 3 is a sectional view (A) to (F) showing each modification.

FIG. 4 is an exemplary cross-sectional view of terminal fixing.

[Fig. 5] Relational characteristic diagram between compressive load and strain

FIG. 6 is a characteristic diagram showing the relationship between the axial muscle ratio and the compression elastic modulus.

[Fig. 7] Relational characteristic diagram between compressive load and strain

FIG. 8 is a relationship characteristic diagram between elapsed time and strain.

[Explanation of symbols]

a Tension material g Filler 1,10 Fixing tool 2 Non-metal sleeve 2a Flowable mortar (thermosetting resin system containing cement, cement system) 2b Hole (non-metal sleeve) 3,4 Ring-shaped streaks 3a Reinforcing reinforcement Inner layer 4a Expansion proof strength / rigidity reinforcement middle layer 5 Axial ridges (axial ridges) 5a Axial rigidity / proof reinforcement layer

Claims (3)

[Claims] 1. A fixing tool which is fitted to an end portion of a tension material such as a fiber composite cable, and in which a filler is injected into the interior of the tension material to be solidified and fixed, wherein a thermosetting resin-based or cement-based material containing an aggregate is used. While forming a non-metallic sleeve with fluid mortar,
A ring-shaped streak of high strength and low elongation fiber system is embedded and reinforced in multiple layers on at least the hole surface side and the middle layer part of the non-metallic sleeve,
A fixing member for a tension material, characterized in that a plurality of similar fiber-shaped axial streaks are embedded and reinforced by forming a group of axial streaks at circumferential intervals in the middle layer of the non-metallic sleeve. 2. The tension member fixing device according to claim 1, wherein a ring-shaped streak embedded in the hole surface side of the non-metallic sleeve forms an inner layer for anti-friction reinforcement mainly with the filling material. In addition to forming the expansion strength / rigidity reinforcing middle layer with the ring-shaped streaks embedded in, the axial rigidity / strength reinforcing layer was formed with the axial streak group embedded in the middle layer of the non-metallic sleeve. Fixing tool. 3. The tension member fixing device according to claim 1 or 2, wherein the non-metal sleeve is made of a thermosetting resin mortar in which an epoxy resin is mixed with aggregates such as silica stone powder and silica sand. A fixing device for a tension material, which is characterized by that.