JP3372522B2 - Non-pull type reaction force PC steel prestress force introduction device and prestress introduction method of concrete member using the device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-pull type reaction force PC steel material for using a reaction force PC steel material used to reinforce a concrete member or a concrete structure in a non-pull method (a non-pulling method: in other words, a stationary method). And a prestressing force introduction method for a concrete member or the like using the device.

[0002]

2. Description of the Related Art Conventionally, hollow PCs have been used to reinforce concrete members or concrete structures such as concrete columns, beams, lower structures, upper structures and tubular structures.
Prestressing equipment for concrete members using steel rods and PC steel rods placed therein (registered trademark: NAPP
The device shown in FIG. 8 is currently used as a unit.

In this prestress introduction device (hereinafter also simply referred to as a unit), the outer ends of a hollow steel steel bar 1 made of steel are threaded to provide male threads 2 and 3, and one male thread 2 is internally threaded. Anchor material 15 having a recess 15a
Is fixed by screwing, and an anchor member 25 made of a nut is screwed into an intermediate portion of the male screw portion 3 on the other end side of the hollow PC steel rod 1, so that a solid steel reaction force PC is inserted in the hollow PC steel rod 1. Steel rod 4
After inserting 0, the hollow PC steel rod 1 on the anchor member 25 side
The female screw hole 4 at the front end of the support cylinder 7 made of a deformed steel sleeve is screwed onto the end of the support cylinder 7, and the pressing locking piece 11 is fitted to the rear end of the reaction force PC steel rod 40. The structure is such that the stopper 8 is screwed into the rear part.

In order to introduce a prestressing force into the hollow PC steel rod 1, as shown by a chain double-dashed line in FIG.
3 and the rear frame 44 are connected in parallel by a plurality of connecting rods 45, and the front surface of the anchor member 25 (or the support member) is inserted into the through hole of the front frame 43 in the frame-shaped frame 42 having the hydraulic jack 50 on the rear frame 44 side. The front surface of the cylinder 7) is formed by forming a pair of flanged semi-cylindrical bodies into a cylindrical shape.
The oil type jack 50 is engaged with the split type receiving piece 49.
Is applied to the front surface of the anchor member 25 or the front surface of the support cylinder 7, and the tip end portion of the pressing rod 47 that engages with the adapter 46 at the front end portion of the movable piston 51 is pressed by the pressing locking piece 11. Engage with the jack 5 in this state
By stretching 0, the hollow PC steel rod 1 is tensioned by pushing the reaction force PC steel rod through the pressing rod 47,
After the predetermined pre-stress is introduced, the stopper 8 is rotated to the back surface of the pressing and locking piece 11 and pressure-bonded so that the reaction force PC steel rod 40 does not return to its original position. The prestress is introduced into the concrete member 21 by arranging the unit at a predetermined position in the form, placing the concrete 20, waiting for the strength of the concrete 20 to develop, and then loosening the stopper 8. .

The tensile force introduced into the hollow PC steel bar is
By adhering the concrete 20 and the hollow PC steel rod, the reaction force is transmitted to the concrete 20 to create a compressive force. That is, prestress is introduced into the concrete 20.

[0006]

In the above-mentioned conventional unit type device, as shown in FIG. 9, after the prestress is introduced into the concrete 20, the reaction force PC steel rod 40 is pulled out to remove the hollow PC steel rod 1. When the cap 41 is attached to the end and the mortar 23 is filled in the notch 22, the mortar 2
3 is prevented from flowing into the hollow PC steel rod 1. However, in the field, there are many cases where the prestressing force introduction device of a relatively short unit is used, and the work of extracting and removing the reaction force PC steel rod 40 and the work of mounting the cap 41 take time and labor, and the unit It was found that the system of reusing the reaction force PC steel bar 40 is costly because the manufacturing of the steel is performed in a factory far from the site.

Further, some owners demand that the grout material be injected into the hollow PC steel rod after the reaction force PC steel rod is pulled out, and the system for pulling out the reaction force PC steel rod 40 is gradually shunned. It became so. Therefore, as a result of the examination, it is more advantageous in terms of cost to leave the reaction force PC steel rod 40 in the hollow PC steel rod 1 as it is (to leave it stationary) after the prestress is introduced into the non-pull type (without pulling out). It has been found. At that time, the reaction force PC steel rod 40 released from the compressed state returns to the original length, and the hollow PC
It was found that the state in which the cap 41 cannot be crowned by protruding from the end of the steel rod 1 occurs. There is also a problem of reusing the remaining reaction force PC steel rod 40. The present invention has been completed based on these findings.

The present invention is intended to solve the above-mentioned problems of the conventional device (unit), and employs a non-pull system in which the relatively long reaction force PC steel rod 40 is not pulled out and is hollow. An object of the present invention is to provide a device that can be placed in the PC steel rod 1 and can be effectively reused in the case where the PC steel rod is placed stationary.

[0009]

In order to advantageously solve the above-mentioned conventional problems, in the prestressing force introduction device using the non-pull type reaction force PC steel material according to claim 1 of the present invention, the outside of the rear end portion is provided. In the male screw portion 3 of the hollow PC steel rod 1 having the male screw portion 3, female screw holes 4 and 5 are provided at both front and rear ends and a female screw hole at the front end portion of the support cylinder 7 having a polygonal rotary tool engaging outer surface 6. 4 is screwed and coupled, a stopper 8 is screwed into a female screw hole 5 at the rear end of the support cylinder 7, and a rear end of a pressing engagement piece 11 arranged in the support cylinder 7 at the front end of the stopper 8. Is engaged with the hollow PC
Pushing reaction force P inserted into the steel rod 1 and pressed
An anchor in which the rear end portion of the C steel rod 14 is engaged with the front portion of the pressing locking piece 11, and the front end portion of the pushing reaction force PC steel rod 14 is fixed to the front end portion of the hollow PC steel rod 1. in wood 15 equivalents
In the prestressing force introduction device for concrete, which is contacted or screwed and has an anchor member 25 on the outside of the middle portion of the hollow PC steel rod, the pushing reaction force PC steel rod 14 is
A front-side non-pull reaction force PC steel rod 13 inserted and arranged in the hollow PC steel rod 1 and a rear portion arranged in the hollow PC steel rod 1 and projecting from a rear end thereof. It is characterized in that it is composed of the side reaction PC steel rod 12 for removal.

Further, in the prestressing force introduction device using the non-pull type reaction force PC steel material of claim 2, in the prestressing force introduction device for concrete which is the premise of claim 1, the pushing reaction force PC steel rod 14 is , A non-pulling reaction force PC steel rod shorter than the hollow PC steel rod 1, and the pressure locking piece 11 is disposed in the hollow PC steel rod 1 and protrudes from the rear end thereof. It is characterized in that it is constituted by a bar-shaped portion on the front side that is formed and a plate-shaped portion on the rear side that engages with the stopper 8. Further, in the prestress force introduction device using the non-pull type reaction force PC steel material according to claim 3, there is a bend on the outside of the rear end portion.
In the male screw part 3 of the hollow PC steel rod 1 having the threaded part 3,
It has female screw holes 4 and 5 at both ends of the rear, and it also has a polygonal rotation.
A female at the front end of the bearing cylinder 7 having the tool engaging outer surface 6
The female hole at the rear end of the support cylinder 7 is screw-connected to the screw hole 4.
A stopper 8 is screwed into the same hole 5, and the stopper 8
At the front end of the pressure locking piece 11 arranged in the support cylinder 7,
The rear part is engaged and inserted into the hollow PC steel rod 1 and pushed.
Pushing reaction force PC steel rod 14 in the pressed state
The pushing reaction piece is engaged with the front portion of the pressing locking piece 11,
The front end of the PC steel rod 14 is the front end of the hollow PC steel rod 1.
The hollow PC steel is screwed into the fixed anchor material 15.
Concree with anchor member 25 on the outside of the middle part of the rod
In the prestressing force introduction device for the tongue, the front end portion of the pushing reaction force PC steel rod 14 is screwed and fixed to the anchor material, and the rear end portion projects from the rear end portion of the hollow PC steel rod 1. And the reaction force PC steel rod 14 for pushing.
At the rear end portion, a male screw portion for fixing the pushing reaction force PC steel rod is formed so that the pushing reaction force PC steel rod 14 is a non-pulling reaction force PC steel rod. Characterize.

Furthermore, the non-pull type reaction force P of claim 4
In the prestressing force introduction device with C steel material, the rear end
The male part of the hollow PC steel rod 1 having the male screw part 3 on the outside of the part
The threaded portion 3 has female screw holes 4 and 5 at both front and rear ends and
In a bearing cylinder 7 having a polygonal rotary tool engaging outer surface 6
The female screw hole 4 at the front end is
A stopper 8 is screwed into the female screw hole 5 at the rear end,
A pressing member arranged in the support cylinder 7 at the front end of the topper 8.
The rear portion of the locking piece 11 is engaged and inserted into the hollow PC steel rod 1.
After the PC steel material 14 for pushing in the state of being placed and pressed
The end portion is engaged with the front portion of the pressing locking piece 11,
The front end portion of the PC steel material 14 for grinding is the front end of the hollow PC steel rod 1.
The hollow P is brought into contact with the anchor material 15 fixed to the hollow portion.
Conc with an anchor member 25 on the outside of the middle part of the C steel rod
In the pre-stress force introduction device for reed, the indenting PC steel material 14 is composed of a plurality of PC steel wires shorter than the hollow PC steel rod 1 and spiral rebars spirally arranged on the outer peripheral surface thereof. So that the pressure locking piece 11 engages with the reaction force PC steel material for non-pull and is arranged in the hollow PC steel rod 1 and protrudes from the rear end thereof. It is characterized in that it is constituted by a bar-shaped portion on the front side that is arranged and a plate-shaped portion on the rear side that engages with the stopper 8. Further, in the prestressing force introduction device using the non-pull type reaction force PC steel material according to claim 5, in the invention according to any one of claims 1, 2, 3 and 4, the hollow PC steel rod 1 and the inside thereof are arranged. It is characterized in that the time-curable resin is filled in a gap between the non-pull reaction force PC steel rod and the non-pull reaction force PC steel material.

Further, in the prestressing method for the concrete member using the prestressing force introducing device for the non-pull type reaction force PC steel material according to claim 6, the hollow PC steel rod 1 having the male screw portion 3 on the outer side of the rear end is provided. The male screw portion 3 is screw-connected to the female screw hole 4 at the front end of the bearing cylinder 7 having female screw holes 4 and 5 at the front and rear ends and having a polygonal rotary tool engaging outer surface 6. A stopper 8 is screwed into the female screw hole 5 at the rear end, and the front end of the stopper 8 is engaged with the rear part of the pressure locking piece 11 arranged in the support cylinder 7, so that the hollow PC steel rod 1 is connected to the hollow PC steel rod 1. The rear end portion of the pushing reaction force PC steel rod 14 in the inserted and pressed state is engaged with the front portion of the pressing locking piece 11, and the front end portion of the pushing reaction force PC steel rod 14 is the hollow. Anchor fixed to the front end of PC steel rod 1. Engaged abutment or screw in wood 15, wherein comprises an anchor member 25 to the intermediate portion outside of the hollow PC steel rod, said pushing reaction force PC steel bar 14, the hollow PC
Front side non-pull reaction force PC inserted into the steel rod 1
A non-pull type reaction force PC steel material composed of a steel rod 13 and a rear-side reaction force PC steel rod 12 for removal, which is disposed in the hollow PC steel rod 1 and protrudes from the rear end thereof. The anchor material 15 and the anchor member 25 in the prestressing force introduction device by the above are embedded in concrete, and concrete 20 is placed around the hollow PC steel rod 1 so that the support cylinder 7 is exposed in the recess of the concrete member. , After the curing of the concrete 20 is completed, the support cylinder 7 and the reaction force PC for removal
After removing the steel rod and introducing prestress to the concrete, a cap is attached to the hollow PC steel rod 1 so as to engage with the reaction force PC steel rod for non-pull, and the mortar is inserted into the recess so as to embed the cap. It is characterized by filling.

Further, in a prestressing method for introducing a concrete member using the prestressing force introducing device for a non-pull type reaction force PC steel material according to claim 7, the hollow PC steel rod 1 having the male screw portion 3 on the outer side of the rear end is provided. The male screw portion 3 is screw-connected to the female screw hole 4 at the front end of the bearing cylinder 7 having female screw holes 4 and 5 at the front and rear ends and having a polygonal rotary tool engaging outer surface 6. A stopper 8 is screwed into the female screw hole 5 at the rear end, and the front end of the stopper 8 is engaged with the rear part of the pressure locking piece 11 arranged in the support cylinder 7, so that the hollow PC steel rod 1 is connected to the hollow PC steel rod 1. The rear end portion of the non-pull PC steel rod 14 in the inserted and pressed state is engaged with the front portion of the pressing locking piece 11, and the pushing reaction force P
The front end portion of the C steel rod 14 is brought into contact with or screwed to the anchor material 15 fixed to the front end portion of the hollow PC steel rod 1, and an anchor member 25 is provided outside the middle portion of the hollow PC steel rod. A male screw portion 27 is provided at the rear end portion of the pushing reaction force PC steel rod 14 protruding from the rear end portion of the hollow PC steel rod 1 to form a prestress force introduction device for a non-pull type reaction force PC steel material. Concrete 20 is placed around the hollow PC steel rod 1 so that the anchor material 15 and the anchor member 25 in the apparatus are embedded in the concrete, and after the curing of the concrete 20 is completed, the support cylinder 7 is removed. Then, a prestress is introduced into the concrete, and then a bearing plate and a washer are fitted into the hollow PC steel rod 1 and screwed into the male screw portion 27 at the rear end of the non-pull PC steel rod 14. Together, by a reaction force PC steel rod fixing nut engaged with the rear end portion of the hollow PC steel bars 1, characterized in that fixing in taut reaction force PC steel bars for the Nonpuru.

[0014]

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in detail based on the illustrated embodiments. FIG. 1 (a) shows a partially cutaway side view of one unit of a prestressing force introduction device for concrete using a hollow PC steel rod according to an embodiment of the present invention, and FIG. 1 (b) shows a longitudinal side view thereof. Hollow PC steel having a male threaded portion 2 on the outer side of one end (front end) in the longitudinal direction of the steel hollow PC steel rod body 1a and a male threaded portion 3 on the outer end of the other end (rear end). The male screw portion 3 of the rod 1 is screw-connected to the female screw holes 4 and 5 at both front and rear ends and the female screw hole 4 at the front end of the support cylinder 7 having the polygonal rotary tool engaging outer surface 6. .

A front male screw portion 8a of a stopper 8 made of a steel tubular annular locking piece is screwed into the female screw hole 5 at the rear end portion of the support cylinder 7 so that the rear end portion of the stopper 8 is outside. The rotary tool engaging outer surface 9 is formed, and the rear end surface of the pressing engagement piece 11 which is disposed inside the support cylinder 7 and has the recess 10 at the front end is engaged with the front end of the stopper 8. One end side is inserted into the hollow PC steel rod 1 and the other end side is arranged so as to project from the other end portion of the hollow PC steel rod 1 in the recess 10 at the front end portion of the pressing engagement piece 11. The short end of the reaction PC steel rod for removal 12 is fitted with the rear end thereof, and the front end of the reaction PC steel rod for removal 12 is entirely housed in the hollow PC steel rod 1. The rear end portion of the non-pull reaction force PC steel rod 13 to be arranged is in contact. In this embodiment, the pushing reaction force P is made by the removal reaction force PC steel rod 12 and the non-pull reaction force PC steel rod 13.
The C steel rod 14 is configured. An anchor material 15 made of a nut having a female screw recess 15a is detachably screwed and fixed to the male screw 2 outside the front end of the hollow PC steel rod 1.
The tip portion of the non-pulling reaction force PC steel rod 13 is in contact with the bottom surface of the female screw recess 15a.

In the state shown in FIG. 1, the apparatus of the present invention is placed in the frame 42 in the state shown in FIG. 8, and the hydraulic jack 50 is used to engage the tip of the movable piston 51. And the pressing locking piece 11 is pressed by the pushing steel rod 16 inserted into the central hollow portion of the stopper 8 so as to move toward the hollow PC steel rod 1, and the removal reaction force PC steel rod 12 and Non-pull (stationary) reaction force PC steel rod 1
After a compressive force is introduced so as to push 3 into the hollow PC steel rod 1, the supporting cylinder 7 or the stopper 8 which is free in that state approaches the pressing engagement piece 11 (FIG. 1). It is a diagram showing a state in which the stopper 8 is moved forward, the front end portion of the stopper 8 is pushed in and engaged with the locking piece 11, and separated from the frame frame 42 by rotating the stopper 8 forward.

In the case of the first embodiment, the support cylinder 7 is removed from the hollow PC steel rod 1, the concrete 20 is hardened and then hardened, and the hollow PC steel rod 1 and the non-pull reaction force PC steel rod 13 are removed. In order to enhance the integrity and improve the ultimate strength of the concrete member, the adhesive / rust preventive material 48 made of a time-curing synthetic resin adhesive obtained by appropriately mixing a retarder with the curing adhesive is a hollow PC steel rod. Injecting and filling from the end opening of No. 1 in advance or at an appropriate time, and
A long non-pull reaction force PC steel rod 13 shorter than the length dimension of the hollow PC steel rod 1 arranged on the back side of the C steel rod 12 is inserted, and then a short length is engaged in series with this. Dimension removal reaction force PC steel rod 12 is non-pull (stationary) reaction force PC steel rod 13
After being arranged in series with the hollow PC steel rod 1 so as to project from the opening end portion on the inlet side of the hollow PC steel rod 1 by a predetermined amount or more, the support cylinder 7 is screwed into the male screw portion 3 of the rear end portion of the hollow PC steel rod 1. And the stopper 8 is screwed onto the rear portion of the support cylinder 7.

In this embodiment, the inside of the hollow PC steel rod 1 is made up of two long and short PC steel rods, a long non-pull (stationary) reaction force PC steel rod 13 and a short length removal reaction PC steel rod 12. The reaction force PC steel material for pushing 14 arranged in
Dimensions of the non-pull reaction force PC steel rod 13 and removal reaction force P
The sum of the dimensions of the C steel rod 12 is configured to be longer than that of the hollow PC steel rod 1 so that the removal reaction force PC steel rod 12 projects to the outside of the rear end portion of the hollow PC steel rod 1. It is configured. This protruding dimension becomes the maximum value of the prestress amount that can be indirectly pushed in by the jack 50.

The concrete prestressing force introducing device 17 of a large number of units thus constructed is carried in,
It is arranged in a mold and concrete 20 is placed in the mold so as to embed the prestressing force introducing device 17, and a frame such as a concrete beam member or a concrete slab member is provided outside the hollow PC steel rod 1. After the concrete 20 constituting the above is cured and hardened, the stopper 8 is rotated by the electric wrench so as to move to the left in FIG. 2, and the compressive force of the reaction force PC steel rod is released. At this time, due to the adhesion of the hollow PC steel rod 1 and the concrete 20, the shortening of the hollow PC steel rod 1 is hindered, so that the prestress is relatively introduced into the concrete 20. If the adhesion between the hollow PC steel rod 1 and the concrete 20 is sufficient, the anchor material 1
5 and the anchor member 25 can be omitted in principle.

Then, after removing the support cylinder 7, only the removal reaction force PC steel rod 12 is removed, and as shown in FIG. 2, the hollow PC is recovered without recovering the non-pulling reaction force PC steel rod 13. The hollow PC steel rod 1 and the non-pulling PC steel rod 13 are integrated by hardening the adhesive and rust preventive material 48 such as a resin which is hardened with time and also functions as rust preventive.

Reaction force PC for pushing After the compressive force of the steel rod 14 is released, reaction force PC for removing the support cylinder 7 and the short length
After the steel rod 12 is extracted and collected, the cap 19 is fitted to the rear end of the hollow PC steel rod 1 so that the tip projection of the cap 19 abuts, and the cap 1
9 and the hollow PC steel rod 1 or the non-pull reaction force PC steel rod 13 are fixed to each other by an adhesive material or screw-connected to each other, and the non-pull reaction force PC steel rod 13 is installed in the hollow PC steel rod 1. Rust prevention treatment is applied to the end of the.

In the first embodiment of the present invention, a long reaction force PC steel rod 13 for pulling and a short reaction force PC for removal are used instead of one conventional reaction force PC steel rod 40 for pushing.
After the introduction of the prestress to the concrete member 21 is completed, the support cylinder 7, the pressing engagement piece 11 and the short reaction force for removal PC steel bar 12 are to be extracted. It is possible to reuse the support cylinder 7, the pressing engagement piece 11, and the short-length removing reaction force PC steel rod 12.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. In the case of this embodiment, the projection portion of one conventional reaction force PC steel rod is deformed into a deformed pushing piece. Which is replaced by the pressure locking piece 11 made of, that is, the pressure locking piece 11 and the removal reaction force PC in the first embodiment.
Steel rod 12 is integrated, stopper 8 and non-pulling PC
A pressure locking piece 11 having an inverted T-shaped cross section, which has an insertable steel rod portion 11a which can be removed together with the support cylinder 7 between the steel rod 13 and the support rod 7.
However, since the other configurations and operation construction procedures are the same as those of the embodiment,
About the same part, the same code | symbol as the said embodiment is attached | subjected and description of the structure and construction procedure is abbreviate | omitted. In this case, the stopper 8 is loosened, the pressing locking piece 11 is removed together with the support cylinder 7, the cap 19 is capped, and the notch 22 is filled with the mortar 23, which is the same state as in FIG. . Therefore, the support cylinder 7 and the pressing locking piece 11 can be reused. In this case, since the pressing engagement piece 11 including the pushing steel bar is combined with the support cylinder 7, the number of parts can be reduced and the work efficiency can be improved.

(Third Embodiment) FIG. 4 shows a third embodiment of the prestressing force introducing device 17 for concrete of the present invention. In the first and second embodiments, a hollow PC is used. In the steel rod 1, as shown in FIG. 5, the pushing reaction force PC steel rod 14 in a loosely fitted state is preliminarily threaded at both ends of the pushing reaction force PC steel rod 14 to form the male screw portions 26, 27. Is provided, and the male screw portion 26 of the tip portion is screwed and coupled to the female screw hole 28 in the central portion of the female screw concave portion 15a of the anchor material 15, and the concrete 20 is hardened, and the support cylinder 7 is removed to introduce prestress. As shown in FIG. 5, an anchor nut 28 for fixing the pushing reaction force PC steel rod is screwed into the male screw portion 27 at the rear end of the pushing reaction force PC steel rod 14, and the anchor nut 28 is attached.
The front end face of the hollow PC steel rod 1 is engaged with the rear end face of the hollow PC steel rod in a pressure-bonded state so that the pushing reaction force PC
The steel rod 14 is fixed by the anchor nut 28 and the reaction force PC steel rod anchor member 15, and when the concrete member 25 is subjected to an excessive load such as cracking, the hollow PC steel rod 1 is integrally joined together. It is configured to resist. In the case of this embodiment, when the excessive load is applied, the pushing reaction force PC steel rod 14 can also exert the tensile resistance force at the same time as the hollow PC steel rod 1, so that the yield strength of the member can be improved. it can.

Since the other construction and the operation procedure are the same as those in the above-mentioned embodiment, the same parts are designated by the same reference numerals and the description of the structure and the operation procedure is omitted.

(Fourth Embodiment) FIG. 6 shows the state in which the prestressing force introducing device 17 for concrete is installed.
In the case where the prestressing force introduction device 17 for concrete shown in Fig. 1 is bent by plastic working, a prestress loss occurs due to friction between the hollow PC steel rod 1 and one pushing reaction force PC steel rod 14. In order to reduce the loss of prestress due to this friction, a plurality of thinner PC steel wires 35 are vertically installed in parallel instead of one non-pull type reaction force PC steel rod. The PC steel wire bundle 36 of the non-pull type is replaced so that each PC steel wire 35 can relatively move in the longitudinal direction thereof, and the spiral reinforcing bar 3 is further provided on the outer peripheral surface of the PC steel wire bundle 36.
Wrap 7 and PC at both ends with appropriate fixing means
It is fixed to the steel wire 35. As described above, the spiral rebar 37
If the prestressing force introduction device for concrete 17 is bent by plastic working during its installation, the respective PC steel wires 35 can move relative to each other in the longitudinal direction. The friction with the inner peripheral surface of No. 1 can be eliminated, and while preventing the buckling of each PC steel wire 35, the risk of prestress loss due to friction can be eliminated. Further, when the compressive force is applied to each PC steel wire 35, each PC steel wire 35 is constrained by the spiral reinforcing bar 37.
The steel wire 35 does not buckle and a compressive force can be applied.

Since the other construction and operation procedure are the same as those in the second embodiment, the same parts are designated by the same reference numerals as those in the above embodiment and the explanation of the structure and the procedure is omitted. To do.

(Fifth Embodiment) FIG. 7 shows a fifth embodiment of the present invention. In the case of this embodiment, the pushing reaction force PC steel rod 14 used in the non-pull method is a hollow PC. The length is set so as to project from the steel rod 1, and both ends of the pushing reaction force PC steel rod 14 are threaded in advance so that the male screw portion 26 is formed at the front end and the male screw portion 27 is formed at the rear end.
Is formed, and the tip portion is screwed and fixed to the anchor material 15,
After the prestress is introduced into the concrete member 21, the anchor plate 29 having a through hole having an inner diameter larger than the outer diameter of the hollow PC steel rod 1 is fitted to the hollow PC steel rod 1 by utilizing the protruding portion on the rear end side. Then, the washer 30 and the reaction force PC steel rod fixing nut 31 are attached. Thereafter, as shown in FIG. 7b, the pulling rod 53 is connected in series to the rear end male screw portion 27 of the pushing reaction force PC steel rod 14 via the coupler 52, and the leg portion 5 is connected.
5, the spacing member 5 having a peripheral side surface partly open
4 is fitted into the tensioning rod 53, the leg 55 is attached to the anchor plate 29, the center hole jack 56 is fitted into the tensioning rod 53, and the nut 57 is attached to the rear end of the tensioning rod 53. Is engaged with the movable piston 58. In this state, when the center hole jack 56 is extended and the pushing reaction force PC steel rod 14 is pulled to the left in FIG. 9 through the pulling rod 53,
Reaction force PC steel rod fixing nut 31 is anchor plate 29
Since it is separated from the above, the reaction force PC steel rod fixing nut 31 is rotated in a direction approaching the anchor plate 29 and tightened to the anchor plate 29, so that the pushing reaction force PC steel rod 14 can be tensioned. Is.
After tensioning the pushing reaction force PC steel rod 14, the center hole jack 56 is opened, the nut 57, the tensioning rod 53, the spacing member 54, and the coupler 52 are removed, and the mortar 23 is cut out. 22 is filled (state of FIG. 7). Also in the case of FIG. 5, the structure can be changed.

[0030]

The present invention having the above-mentioned structure has the following effects. Relatively long reaction force PC It saves the labor of pulling out a steel bar, and reaction force PC can be used when an excessive load acts such as cracking.
Since the steel rod works integrally with the hollow PC steel rod, the ultimate yield strength of the concrete member can be increased, and the total cost of construction can be reduced. Using reaction force PC steel rod, in addition to introducing prestress to concrete member by hollow PC steel rod, it is possible to introduce prestress to concrete member by reaction force PC steel rod. The thickness of the PC steel bar can be reduced, the amount used can be reduced, and the cost can be reduced. Reaction force P for pushing in the existing prestress force introduction device
It is possible to change to the reaction force PC steel rod stationary prestress force introduction device of the present invention by simply changing the parts such as cutting or replacing the C steel rod.

[Brief description of drawings]

1A and 1B show a prestressing device for concrete according to a first embodiment of the present invention, in which FIG. 1A is a partially cutaway side view and FIG. 1B is a partially cut out vertical side view. .

FIG. 2 is a partially cutaway vertical side view showing a state after introducing prestress to a concrete member using the prestressing device for concrete according to the first embodiment of the present invention.

3A and 3B show a prestressing introduction apparatus for concrete according to a second embodiment of the present invention, wherein FIG. 3A is a partially cutaway side view, and FIG. 3B is a partially cut out vertical side view. .

4A and 4B show a prestressing introduction apparatus for concrete according to a third embodiment of the present invention, wherein FIG. 4A is a partially cutaway side view and FIG. 4B is a partially cut out vertical side view. .

FIG. 5 is a partially cutaway vertical side view showing a state after introducing prestress to a concrete member using the prestressing apparatus for concrete according to the third embodiment of the present invention.

FIG. 6 shows a prestressing device for concrete according to a fourth embodiment of the present invention, (a) is a partially cutaway side view, and (b) is a partially cutout vertical side view. , (C) are sectional views taken along the line AA of (b).

FIG. 7 (a) is a partially cutaway vertical side view showing a state after introducing prestress to a concrete member using the prestressing device for concrete according to the fifth embodiment of the present invention; ) Is an explanatory view in the case of introducing a tension force into the reaction force PC steel rod.

FIG. 8 is a partially cutaway vertical side view showing a conventional prestress introduction device.

FIG. 9 is a partially cutaway vertical sectional side view showing a state after introducing prestress to a concrete member using a conventional prestress introducing device for concrete.

[Explanation of symbols]

1 Hollow PC steel rod 1a Steel hollow PC steel rod body 2 Male thread 3 Male thread 4 female screw holes 5 female screw holes 6 External surface for turning tool engagement 7 support cylinder 8 stopper (annular locking piece) 9 Outer surface for turning tool engagement 10 recess 11 Press locking piece 12 Reaction force PC steel rod for removal 13 Non-pull reaction force PC steel rod 14 Reaction force PC steel rod or steel for pushing 15 anchor material 16 Indented steel rod 17 Prestressing force introduction device 18 Anticorrosion material 19 cap 20 concrete 21 Concrete member 22 Notch 23 Mortar 24 Deformed member 25 anchor members 26 Male thread 27 Male thread 28 Anchor nut 29 anchor plate 30 watchers 31 Steel rod fixing nut 32 Reaction force PC steel rod fixing tubular ring 33 Female screw hole 35 PC steel wire 36 PC steel wire bundle 37 spiral rebar 40 Reaction force PC steel rod 41 cap 42 frame 43 front frame 44 rear frame 45 connecting rod 46 Adapter 47 Push rod 48 Antirust agent 49 2 split type receiving piece 50 hydraulic jack 51 movable piston

Front Page Continuation (72) Inventor Masafumi Imai 5 Kinugaoka, Moka-shi, Tochigi Oriental Engineering Co., Ltd. Technical Research Institute (72) Inventor Shigeru Mizoguchi 5893 Tamura, Hiratsuka-shi, Kanagawa High-frequency smelting company Hiratsuka Factory (56) ) Reference JP-A-11-144130 (JP, A) JP-A-9-221915 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04C 5/08 E04G 21/12 104

Claims (7)

(57) [Claims] 1. A hollow P having a male screw portion 3 on the outside of a rear end portion.
The male screw portion 3 of the C steel rod 1 is screw-connected to the female screw hole 4 at the front end of the support cylinder 7 having female screw holes 4 and 5 at both front and rear ends and having a polygonal rotary tool engaging outer surface 6. The stopper 8 is screwed into the female screw hole 5 at the rear end of the support cylinder 7, and the rear end of the pressing engagement piece 11 arranged in the support cylinder 7 is engaged with the front end of the stopper 8, The rear end portion of the pushing reaction force PC steel rod 14 inserted into the hollow PC steel rod 1 and pressed is engaged with the front portion of the pushing engagement piece 11, and the pushing reaction force PC steel rod 14 is pressed. Of the hollow PC steel rod 1 is abutted or screwed to the anchor material 15 fixed to the front end of the hollow PC steel rod 1, and an anchor member 25 is provided outside the middle portion of the hollow PC steel rod to introduce prestressing force for concrete. In the device, the pushing reaction force PC steel rod 14 is the hollow The front side non-pull reaction force PC steel rod 13 inserted into the C steel rod 1 and the hollow PC steel rod 1 are arranged so as to project from the rear end thereof and A prestress force introduction device using a non-pull type reaction force PC steel material, characterized in that it is constituted by a reaction force reaction PC steel rod 13 and a rear side reaction force PC steel rod 12 for removal. 2. A hollow P having a male screw portion 3 on the outside of the rear end portion.
The male screw portion 3 of the C steel rod 1 is screw-connected to the female screw hole 4 at the front end of the support cylinder 7 having female screw holes 4 and 5 at both front and rear ends and having a polygonal rotary tool engaging outer surface 6. The stopper 8 is screwed into the female screw hole 5 at the rear end of the support cylinder 7, and the rear end of the pressing engagement piece 11 arranged in the support cylinder 7 is engaged with the front end of the stopper 8, The rear end portion of the pushing reaction force PC steel rod 14 inserted into the hollow PC steel rod 1 and pressed is engaged with the front portion of the pushing engagement piece 11, and the pushing reaction force PC steel rod 14 is pressed. Of the hollow PC steel rod 1 is abutted or screwed to the anchor material 15 fixed to the front end of the hollow PC steel rod 1, and an anchor member 25 is provided outside the middle portion of the hollow PC steel rod to introduce prestressing force for concrete. In the device, the pushing reaction force PC steel rod 14 is the hollow The front is a non-pulling reaction force PC steel rod shorter than the C steel rod 1, and the pressing locking piece 11 is arranged in the hollow PC steel rod 1 and is arranged so as to project from the rear end thereof. A prestress force introduction device using a non-pull type reaction force PC steel material, characterized in that it is configured by a rod-shaped portion on the side and a plate-shaped portion on the rear side that engages with the stopper 8. 3. A hollow P having a male screw portion 3 on the outer side of the rear end portion.
The male screw portion 3 of the C steel rod 1 is screw-connected to the female screw hole 4 at the front end of the support cylinder 7 having female screw holes 4 and 5 at both front and rear ends and having a polygonal rotary tool engaging outer surface 6. The stopper 8 is screwed into the female screw hole 5 at the rear end of the support cylinder 7, and the rear end of the pressing engagement piece 11 arranged in the support cylinder 7 is engaged with the front end of the stopper 8, The rear end portion of the pushing reaction force PC steel rod 14 inserted into the hollow PC steel rod 1 and pressed is engaged with the front portion of the pushing engagement piece 11, and the pushing reaction force PC steel rod 14 is pressed. In the prestressing force introduction device for concrete, the front end portion of which is screwed into the anchor material 15 fixed to the front end portion of the hollow PC steel rod 1, and the anchor member 25 is provided outside the middle portion of the hollow PC steel rod. The front end of the pushing reaction force PC steel rod 14 is the anchor. The hollow PC steel rod 1 is arranged so that its rear end projects from the rear end of the hollow PC steel rod 1, and the pushing reaction force PC is attached to the rear end portion of the pushing reaction PC steel rod 14. Prestressing by a non-pull reaction force PC steel material, characterized in that a male screw portion for nut screwing for fixing a steel rod is formed, and the pushing reaction force PC steel rod 14 is a non-pull reaction force PC steel rod. Force introduction device. 4. A hollow P having a male screw portion 3 on the outside of the rear end portion.
The male screw portion 3 of the C steel rod 1 is screw-connected to the female screw hole 4 at the front end of the support cylinder 7 having female screw holes 4 and 5 at both front and rear ends and having a polygonal rotary tool engaging outer surface 6. The stopper 8 is screwed into the female screw hole 5 at the rear end of the support cylinder 7, and the rear end of the pressing engagement piece 11 arranged in the support cylinder 7 is engaged with the front end of the stopper 8, The rear end portion of the pushing PC steel material 14 inserted and arranged in the hollow PC steel rod 1 is engaged with the front portion of the pressing locking piece 11, and the front end portion of the pushing PC steel material 14 is hollow. For the anchor material 15 fixed to the front end of the PC steel rod 1.
In the prestressing force introduction device for concrete which is abutted and has an anchor member 25 on the outer side of the intermediate portion of the hollow PC steel rod, the pushing PC steel material 14 is the hollow PC steel rod.
A non-pull reaction force PC steel material composed of a plurality of PC steel wires shorter than the steel rod 1 and spiral reinforcing bars spirally arranged on the outer peripheral surface thereof, and the pressing engagement piece 11 is The rod-shaped portion on the front side, which is engaged with the non-pulling reaction force PC steel material and is arranged in the hollow PC steel rod 1 and is arranged so as to project from the rear end portion thereof, and the rear side portion which is engaged with the stopper 8. A prestress force introduction device using a non-pull type reaction force PC steel material characterized by being constituted by a plate portion. 5. A time-curable resin is filled in a gap between the hollow PC steel rod 1 and a non-pull reaction force PC steel material such as a non-pull reaction force PC steel rod arranged inside the hollow PC steel rod 1. The prestress force introduction device by the non-pull type reaction force PC steel material according to any one of claims 1, 2, 3, and 4. 6. A hollow P having a male screw portion 3 on the outer side of the rear end portion.
The male screw portion 3 of the C steel rod 1 is screw-connected to the female screw hole 4 at the front end of the support cylinder 7 having female screw holes 4 and 5 at both front and rear ends and having a polygonal rotary tool engaging outer surface 6. The stopper 8 is screwed into the female screw hole 5 at the rear end of the support cylinder 7, and the rear end of the pressing engagement piece 11 arranged in the support cylinder 7 is engaged with the front end of the stopper 8, The rear end portion of the pushing reaction force PC steel rod 14 inserted into the hollow PC steel rod 1 and pressed is engaged with the front portion of the pushing engagement piece 11, and the pushing reaction force PC steel rod 14 is pressed. Of the hollow PC steel rod 1 is abutted or screwed to the anchor material 15 fixed to the front end of the hollow PC steel rod 1, and an anchor member 25 is provided outside the middle portion of the hollow PC steel rod. The force PC steel rod 14 is inserted into the hollow PC steel rod 1 and arranged on the front side. And Le reaction force PC steel bar 13, the hollow PC steel rod 1 reaction force PC steel removal of arranged rear side so as to protrude from the rear end thereof while being placed within the rod 12
The hollow PC steel so that the anchor material 15 and the anchor member 25 in the prestress force introduction device using the non-pull type reaction force PC steel material configured by are embedded in concrete and the supporting cylinder 7 is exposed in the concave portion of the concrete member. Concrete 20 around the rod 1
After finishing the curing of the concrete 20,
After removing the support cylinder 7 and the removal reaction force PC steel rod and introducing prestress to the concrete, a cap is attached to the hollow PC steel rod 1 so as to engage with the non-pull reaction force PC steel rod, A prestressing method for a concrete member using a prestressing force introducing device using a non-pull type reaction force PC steel material, characterized in that the recess is filled with mortar so as to embed the cap. 7. A hollow P having a male screw portion 3 on the outside of the rear end portion.
The male screw portion 3 of the C steel rod 1 is screw-connected to the female screw hole 4 at the front end of the support cylinder 7 having female screw holes 4 and 5 at both front and rear ends and having a polygonal rotary tool engaging outer surface 6. The stopper 8 is screwed into the female screw hole 5 at the rear end of the support cylinder 7, and the rear end of the pressing engagement piece 11 arranged in the support cylinder 7 is engaged with the front end of the stopper 8, The rear end portion of the non-pull PC steel rod 14 inserted and arranged in the hollow PC steel rod 1 is engaged with the front portion of the pressing engagement piece 11, and the front end of the pushing reaction force PC steel rod 14 is engaged. The portion is screwed to the anchor material 15 fixed to the front end portion of the hollow PC steel rod 1, and the anchor member 25 is provided outside the intermediate portion of the hollow PC steel rod, and the rear end of the hollow PC steel rod 1 is provided. A male screw portion 27 is provided at the rear end portion of the pushing reaction force PC steel rod 14 protruding from the portion. A pre-stress force introduction device for a non-pull type reaction force PC steel material is configured by pouring concrete 20 around the hollow PC steel rod 1 so as to embed the anchor material 15 and the anchor member 25 in the equipment. Then, after the curing of the concrete 20 is completed, the support cylinder 7 is removed to introduce prestress into the concrete, and then a bearing plate and a washer are fitted on the hollow PC steel rod 1 to remove the non-pull reaction. The reaction force PC steel rod fixing nut engaged with the male screw portion 27 at the rear end portion of the force PC steel rod 14 and engaged with the rear end portion of the hollow PC steel rod 1 causes the reaction force PC steel for non-pull Prestressing method for concrete member using prestressing force introducing device with non-pull type reaction force PC steel characterized by fixing the rod in a tensioned state .