JPH0625459B2 - Fixing method of PC tension material and fixing device thereof - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for fixing PC tendons in prestressed concrete and a fixing device therefor.

(Prior Art) Conventionally, fixing of a PC steel material in prestressed concrete is performed by a fixing device A'as shown in FIG.

The fixing method is as follows: The PC steel rod B'is mounted in the mold 10 'by the fixing device A', concrete m'is placed in the mold 10 ', and a mold is left on the hardened part of the concrete m'. The frame 10 'and the lid 6'of the fixing tool A'were removed.

Then, a tension bar is connected to the tip of the PC steel rod B'via a coupler, and the tension bar is tensioned with a jack and the nut 8'is tightened so that the tension state of the PC steel rod B'is not loosened. Establish.

Next, the jack is removed, the lid is screwed, and the grout injection device injects the grout solution into the sheath b'and the cylindrical body 4'of the fixing device A'to complete the fixing and the trace filling. is there.

(Problems to be solved by the invention) However, the fixing method using the fixing device as described above is preferable in the case of PC steel rods that can connect the tension bars by using the coupler at the time of tension, but does not use the coupler. There is a problem that it cannot be used in the case of PC steel wire or stranded wire or carbon fiber wire or stranded wire which has a long tension margin which cannot be obtained.

The present invention has been made in view of the above problems, and an object thereof is to provide a fixing device and a fixing method that can be used for a PC steel wire and a stranded wire having a long tension allowance, a carbon fiber wire, and a stranded wire. .

(Means for Solving the Problem) Means of the present invention for solving the above-mentioned problems and achieving the object are to provide a PC tension member by means of a fixing device including a fixing tool and a form fitting tool, and to fix both ends thereof. Is attached to the formwork as a tension allowance while protruding to the outside of the formwork, and after the casting concrete in the formwork is hardened, the formwork fixture is removed from the fixing tool together with the dismantling of the formwork, and the tension allowance is applied. There is a fixing method for PC tension material, which is characterized by grabbing and fixing with a jack and then cutting, and then injecting grout liquid into the sheath to fix it, and a screw is provided on one side of the support plate. And a sheath connecting pipe on each of the other side surfaces, and a through hole communicating the cylindrical body and the sheath connecting pipe and a grout injection hole sandwiching the through hole. Attached fixing device and detachable installation on the cylinder. And a through-hole pipe projectingly provided on the upper surface of the cover body. The fixing device for a PC tension material is characterized in that it has a through hole through which the PC tension material is inserted, and a locking portion is provided at the tip end portion thereof.

(Operation) Thus, according to the above configuration, the PC tension member is molded by the fixing device including the fixing tool and the mold mounting tool in a state in which both ends of the PC tension material are projected to the outside of the mold as tension margins. It is attached to the frame and concrete is poured into the frame.

After the concrete is hardened, the formwork is disassembled and the formwork fixture is removed from the fixing tool.

Next, the tension of the PC tension material is grabbed and tensioned with a jack, and the PC tension material fixing member including a chuck and a cotter fixes the tension so as not to loosen the tension.

Then, the tension allowance of the PC tension material is cut, and the grout injection device injects the grout liquid into the sheath and the cylindrical body of the fixing tool to complete the tension fixing and the filling of the notched portion.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The PC tension member fixing device A of the present invention applies a prestress to the concrete by tension-fixing the PC tension member B at the end portion of the concrete m. The fixing tool 1 and the form fitting 2 It is composed of and.

The PC tendons B are PC steel wire and stranded wire, carbon fiber wire and stranded wire, PC steel rod and the like.

The fixing tool 1 includes a tubular body 4 provided on one side surface of a plate-shaped pressure support plate 3,
It is composed of a sheath connecting pipe 5 provided on the other side surface, which are communicated with each other through a through hole 3a of the pressure bearing plate 3, and the pressure bearing plate 3 is provided with a grout injection hole 3b.

The grout injection hole 3b is for injecting the grout liquid n into the sheath b, and the through hole 3a is sandwiched so as not to be blocked by the PC tension material fixing body 11 fixing the PC tension material B. It is provided in the state. Further, a screw portion 4a into which a lid body 6 of the frame body mounting tool 2 described later is screwed is engraved on the inner circumference of the tip end portion of the cylindrical body 4.

The frame attachment 2 is detachably screwed to the tubular body 4 of the fixing tool 1 to open and close it, and is composed of a lid 6 and a through pipe 7 projecting from the upper surface thereof. Through tube 7
Is provided with a through hole 7a into which the PC tension material B is inserted,
The PC tension member B is attached to the mold 10 in a state of protruding to the outside of the mold 10 through the through hole 7a.

The lid 6 is disc-shaped and has a threaded portion 6a formed on the outer periphery thereof so as to be screwed onto the inner surface of the cylindrical body 4.

Further, a locking portion 9 including a screw portion 7b and a nut 8 is provided on the outer periphery of the distal end portion of the through tube 7.

Next, a fixing method using the fixing device A for PC steel will be described.

First, as shown in FIG. 3, in order to attach the fixing device A of the PC tension member to the mold 10, the fixing tool 1 and the mold fitting 2 are attached.
After screwing and integrating with each other, the distal end portion of the sheath b is inserted into the outer periphery of the distal end portion of the sheath connecting tube 5 in the fixing tool 1 and connected to the fixing device A.

At this time, the PC tension material B is inserted into the through hole 7a of the through tube 7, and the PC tension material B in the tubular body 4 is chucked by the chuck 11.
A fixing member for PC tension material 11 including a and a cotter 11b is attached. Then, the through pipe 7 of the form fitting 2 is attached to the form 10
The screw portion 7b of the locking portion 9 while being inserted into the through hole 10a of
By screwing the nut 8 onto the fixing device A and tightening it, the PC tension member B is fixed in a state of being projected from the mold 10. This overhanging portion serves as a tension allowance a for the jack 12 and requires a length of about 2 m.

Then, concrete m is placed in the mold 10, the mold 10 is dismantled after the concrete m is hardened, the mold fixture 2 is removed from the fixing tool 1, and then the jack 12 is attached.

Then, as shown in FIG.
I was nervous and pressed the cotter on the jack 12.
At 12a, the cotter 11b of the PC tension member fixing body 11 is the bearing plate 3
It is pushed to the side and fixed so that the tension of the PC tension material B is not loosened.

Next, as shown in FIG. 5, the tension allowance a is cut in the vicinity of the upper end of the cylindrical body 4, the grout injection cap 13 is connected to the cylindrical body 4, and the cylindrical body is cut by a grout injection device (not shown). The grout liquid n is injected into the sheath b through the nozzle 4.

At this time, since the pressure bearing plate 3 is provided with two grout injection holes 3b on the inner peripheral side of the tubular body 4, the PC tension member fixing body 11 is provided.
Will not be blocked by.

Further, even if one is blocked by the PC tension member fixing body 11, the grout injection hole 3b can be used to inject the grout liquid n.

Finally, as shown in FIG. 6, after the grout liquid n is filled in the cylinder 4, the grout injection cap 13 is removed from the cylinder 4, and the remaining ungrouted portion is filled with mortar to fix it. To complete.

(Effects of the Invention) The present invention has the following effects due to the above configuration.

A cylinder having a threaded portion is provided on one side surface of the pressure support plate, and a sheath connecting tube is provided on the other side surface thereof. The support plate sandwiches the through hole for communicating the cylinder body and the sheath connection tube and the through hole. A fixing member provided with a grout injection hole in the above state, and a form fitting member detachably attached to the cylinder body, and the mold fitting member is attached to the screw portion of the cylinder body. And a through-tube projectingly provided on the upper surface of the lid body, the through-tube having a through-hole into which the PC tension material is inserted, and a locking portion provided at the tip end thereof to fix the PC tension material. By constructing the device, the PC tension member can be attached to the mold in a state of being bulged to the outside of the mold via the through pipe, so that a PC steel wire and a stranded wire with a long tension allowance that cannot use a coupler. It is possible to provide a fixing device in which carbon fiber wire, stranded wire, and the like can be used.

A PC tension member arranged in the mold by a fixing device including a fixing tool and a mold mounting tool is attached to the mold with both ends thereof protruding outside the mold as a tension allowance, and After the casting concrete in the frame has hardened, the formwork fixture is disassembled together with the formwork dismantling from the fixing device, the tension allowance is grabbed and the jack is tensioned and fixed, and then cut, and then the grout liquid is injected into the sheath. Since it is fixed in place, tension fixing with PC steel strands or carbon fiber strands, which cannot use a coupler, can be easily and quickly performed, so that the tension fixing work can be shortened and streamlined. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fixing device for PC steel material of the present invention, FIG. 2 is a cross-sectional view with a form fitting removed, and FIGS. 3 to 6 are cross-sectional views showing a fixing method. The figure is a cross-sectional view showing a conventional example. A: PC steel fixing device, B: PC steel a ... Tension allowance, b ... Sheath m ... Concrete, n ... Grout liquid 1 ... Fixing tool, 2 ... Form fitting 3 ... Pressure bearing plate 3a ... through hole 3b ... grout injection hole, 4 ... cylindrical body 4a ... screw part, 5 ... sheath connecting pipe 6 ... lid body, 7 ... through pipe 7a ... through hole, 7b ...... Screw part 8 ...... Nut, 9 ...... Locking part 10 ...... Formwork 11 ...... Fixing body for PC tension material, 12 ...... Jack 12a ...... Cotter pressing 13 ...... Grout injection cap

Claims (2)

[Claims] 1. A PC tension member is attached to a mold by means of a fixing device comprising a fixing tool and a mold mounting tool, with both ends of the PC tension member protruding outside the mold as a tension margin, and inside the mold. After the setting concrete is cured, the mold mounting tool is removed from the fixing tool together with the dismantling of the mold, the tension allowance is grasped, the jack is tensioned and fixed by the jack, and then cut, and then the grout liquid is injected into the sheath. Fixing method for PC tension material characterized by fixing and filling in. 2. A pressure bearing plate is provided with a tubular body having a threaded portion on one side and a sheath connecting pipe is provided on the other side, and the bearing plate has a through hole for communicating the tubular body and the sheath connecting pipe. A fixing tool provided with a grout injection hole sandwiching the through hole, and a form fitting tool detachably provided on the cylinder body, wherein the form fitting tool is attached to a screw portion of the cylinder body. A lid body screwed together and a through-tube projectingly provided on the upper surface of the lid body were provided with a through-hole into which the PC tension material was inserted, and a locking portion was provided at the tip thereof. PC characterized by
Tension material fixing device.