JP4295844B2 - Method of injecting viscous material into the gap between pipe and bar - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for injecting a viscous material into, for example, a PC steel bar unit for introducing prestress into a concrete member or structure.
[0002]
[Background]
PC steel bar unit that can introduce prestress into a concrete member by a simple operation at a construction site when prestress is introduced into the concrete member or the members are connected to each other by prestress (Japanese Patent Laid-Open No. 8-151632, The applicant of the present application proposed Kaikai No. 9-221915.
[0003]
FIG. 4 shows such a PC steel bar unit 100. The PC steel bar unit 100 includes a pipe-shaped hollow PC steel bar 101 having at least one open end, and a solid PC steel for reaction force inserted into the hollow PC steel bar 101 and introduced with a compressive force. A rod 102 and detachable tension holding means 103 for holding the compressive force introduced into the solid PC steel rod 102 and transmitting the compressive force as a tensile force to the hollow PC steel rod 101 are provided.
[0004]
The tension retaining means 103 is connected to a nut 104 screwed into a screw portion at the left end portion of the hollow PC steel rod 101 in the drawing and an end portion of the solid PC steel rod 102 inserted into the nut 104. The frame 105 is in contact with the hollow bolt 106 that is screwed into the inner periphery of the nut 104 and is in contact with the frame 105. By removing the tension holding means 103 from the hollow PC steel rod 101, The hollow PC steel rod 101 is subjected to a shrinking force, and a compressive force as a prestress is introduced into the outer peripheral concrete block.
[0005]
By the way, in the PC steel bar unit 100, when the hollow PC steel bar 101 and the tension holding means 103 are damaged before being embedded and fixed in concrete, the tensile force introduced into the hollow PC steel bar 101 is reduced. Has been pointed out, and the possibility of the hollow PC steel rod 101 popping out has been pointed out.
[0006]
Therefore, the present applicants, in Japanese Patent Application No. 9-172073, injected a viscous material into the gap between the hollow PC steel rod 101 and the solid PC steel rod 102 and tried to jump out the hollow PC steel. It has been proposed to attenuate the force of the rod 101 by the adhesive force of the viscous material. At this time, injection of the viscous material into the gap is performed from one end side to the other end side while applying pressure to the viscous material after inserting the solid PC steel rod 102 into the hollow PC steel rod 101. .
[0007]
[Problems to be solved by the invention]
However, in the method in which the viscous material is injected under pressure, it takes time for the viscous material to reach the front end of the PC steel bar unit, and especially when the gap between the hollow PC steel bar and the solid PC steel bar is small. In some cases, a nest is likely to be formed inside, and the viscous material cannot be reliably injected. Therefore, there is a problem that the viscous material cannot be injected efficiently and workability is poor.
[0008]
An object of the present invention is to provide an injection method capable of improving workability by efficiently injecting a viscous material into a gap between a pipe and a bar constituting a PC steel bar unit or the like.
[0009]
[Means for Solving the Problems]
The injection method of the present invention is a method of injecting a viscous material into a gap between a pipe and a rod inserted in the pipe, and the rod is applied to the outer peripheral surface of the rod while applying the viscous material. When inserting a material into the pipe, an application means for applying the viscous material to the bar is provided so as to be able to hold an end portion on the open side of the pipe, and the end portion on the open side and the coating portion. A sealing cap that is attached to the end portion and prevents the viscous material from leaking from the coating means is interposed between the sealing means and the coating means. A packing is provided which is attached to the coating means and prevents leakage of the viscous material from the coating means .
[0010]
Here, the main component of the viscous material is not particularly limited, and an asphalt-type goose material, an epoxy resin as a main component, a polyurethane resin or a polyester resin as a main component can be used.
[0011]
In the present invention, the stick material is inserted into the pipe while the viscous material is applied to the outer peripheral surface of the stick material. Therefore, when the stick material is completely inserted into the pipe, the viscosity to the gap is almost the same. Material injection is complete. At this time, for example, when the rod side is moved and inserted into the pipe, the viscous material is adapted to the movement of the rod and reaches the front end of the pipe together with the rod. By moving the material at a predetermined speed, the viscous material is injected in a short time compared to the conventional method in which the material is injected under pressure. In addition, by applying the viscous material to the rod, a nest is less likely to be generated particularly at the interface between the rod and the viscous material, so that the viscous material is more reliably injected as compared with the conventional case. As described above, for example, it is possible to efficiently inject a viscous material into a PC steel bar unit to improve workability, and the object is achieved.
[0012]
In the injection method of the present invention, at least one of the pipe and the bar may be rotated with respect to the other.
Further, in the present invention, a thread is formed on the outer peripheral surface of the pipe, and the sealing cap has an uneven surface engaging with the outer peripheral surface of the pipe on the inner peripheral surface, and the pipe is opened. A step that contacts the end face on the side may be provided.
Further, the present invention is a method for injecting a viscous material into a gap between a pipe having a cylindrical outer peripheral surface and a bar material having a thread formed on the outer peripheral surface inserted in the pipe, When the stick material is inserted into the pipe while the viscous material is being applied, an application means for applying the viscous material to the stick material is provided so as to hold the end portion on the open side of the pipe. In addition, a pipe packing for preventing leakage of the viscous material from the coating means in close contact with the outer peripheral surface of the pipe is provided between the open end and the coating means, and the rod Between the material and the coating means, there is provided a bar packing that has an uneven surface that engages with the thread on the inner peripheral surface, and prevents leakage of the viscous material from the coating means, After inserting the bar into the pipe, an anchor nut is attached to the thread. The gap between the pipe and the bars, characterized in that it is fitted is a method of injecting viscous material.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each embodiment of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a front view schematically showing the entire injection apparatus 1 according to the present embodiment.
In FIG. 1, an injection apparatus 1 is an apparatus for injecting a viscous material A (FIG. 2) into the PC steel rod unit 100 (FIG. 4) described above, in which a hollow PC steel rod 101 as a pipe is placed. Support means 4 comprising a mounting table 2 and a second mounting table 3 on which a solid PC steel bar 102 as a bar is mounted, and a coating for applying a viscous material to the outer peripheral surface of the solid PC steel bar 102 The means 5 is roughly composed of a moving means 6 for moving the solid PC steel rod 102 toward the hollow PC steel rod 101 and a rotating means 7 for rotating the hollow PC steel rod 101.
[0015]
The first and second mounting tables 2 and 3 of the support means 4 are provided by using a section steel material such as an L-shaped section, an H-shaped section, or a C-shaped section. , 102 can be horizontally supported on the same axis.
[0016]
The coating means 5 is provided near the end of the second mounting table 3 on the first mounting table 2 side, and a coating head (nozzle) 51 for coating the solid PC steel rod 102 with the viscous material A; For example, a tank 52 for the viscous material A installed below the deposition head 51 and a pump 53 used to supply the viscous material A from the tank 52 to the coating head 51 are roughly configured.
[0017]
As shown in FIG. 2, the coating head 51 passes the solid PC steel rod 102 through a hollow portion supplied and filled with the viscous material A, so that the viscous material A is applied to the outer peripheral surface of the solid PC steel rod 102. A hollow head main body 511 fixed to the second mounting table 3 is provided, and a supply hose 512 for supplying the viscous material A to the head main body 511 (see FIG. 1) to which a supply hole (not shown) to which 1) is attached, an escape hole 511B for allowing excess viscous material A to escape, a first round hole opening 511C opened on the first mounting table 2 side, and an opening on the second mounting table 3 side The second round hole opening 511D is provided. Of these holes, the escape hole 511 </ b> B communicates with the return hose 513 so that the excess viscous material A is returned to the tank 52.
[0018]
An annular attachment 514 having an insertion hole 514A corresponding to the first round hole opening 511C is fixed around the first round hole opening 511C of the head body 511, and the hollow PC steel rod 101 is inserted into the insertion hole 514A. Insertion is held. At this time, a sealing cap 110 is screwed into the screw portion 101A formed on the outer periphery of the end portion of the hollow PC steel rod 101, and the inner periphery of the insertion hole 514A is formed on the smooth outer peripheral surface 111 of the cap 110. The packing 515 provided on the surface is in close contact in a good state.
[0019]
An annular attachment 516 having an insertion hole 516A corresponding to the second round hole opening 511D is fixed around the second round hole opening 511D of the head body 511, and the front end of the solid PC steel rod 102 is fixed to the insertion hole 516A. Is inserted and held. A wide packing 517 provided on the inner peripheral surface of the insertion hole 516A is in direct contact with the smooth outer peripheral surface of the solid PC steel rod 102.
[0020]
As the tank 52 and the pump 53, those generally used for storing or pumping the viscous material A can be used, and detailed description thereof is omitted here.
[0021]
The moving means 6 moves along a pair of guide rails (not shown) provided on the second mounting table 3 so that the rear end of the solid PC steel rod 102 can be clamped by a plurality of chucks. Is provided. Both ends of a series of chains 613 (FIG. 1) are attached to such moving means 6, and the chains 613 are wound around the sprockets 614 provided on both ends in the longitudinal direction of the second mounting table 3. Has been. That is, the moving means 6 reciprocates via the chain 613 by rotating the sprocket 614 provided on one end side of the second mounting table 3 in the forward and reverse directions with a motor or the like.
[0022]
The rotating means 7 is rotatable and provided so that the hollow PC steel rod 101 can be clamped by a plurality of chucks. Such a rotating means 7 includes a motor as a driving source, and the rotation of the motor is finally transmitted to the hollow PC steel rod 101 by a pulley, an endless belt or the like. The rotating means 7 is provided so that the hollow PC steel rod 101 can pass therethrough, and the rear end of the hollow PC steel rod 101 passes through the rotating means 7 and is inserted into the coating head 51, and is sandwiched in this state. It has come to be.
[0023]
Below, the injection | pouring procedure of the viscous material A is demonstrated.
(1) First, the hollow PC steel bar 101 and the solid PC steel bar 102 are placed on the first and second mounting tables 2 and 3, respectively. On the hollow PC steel rod 101 side, after a cap 110 is screwed to the rear end of the hollow PC steel rod 101, the rear end side of the hollow PC steel rod 101 is passed through the rotating means 7 to pass through the inside of the coating head 51. Insert into. Next, the chuck of the rotating means 7 is tightened to hold the hollow PC steel rod 101.
[0024]
(2) On the other hand, on the side of the solid PC steel rod 102, first, the front end of the solid PC steel rod 102 is inserted into the coating head 51, and then the moving means 6 is advanced to a predetermined position, and the PC steel. The rear end of the rod 102 is clamped with a chuck.
[0025]
(3) The injection work is performed following the above preparation work. That is, the rotating means 7 rotates the hollow PC steel rod 101, operates the pump 53 to supply the viscous material A, and the moving means 6 moves the solid PC steel rod 102, thereby causing the solid PC steel rod 102 to move. The solid PC steel rod 102 is inserted into the hollow PC steel rod 101 while being applied so that the viscous material A is entangled, and the gap between the PC steel rods 101 and 102 is filled with the viscous material A. . Prior to the injection operation, the pump rotation speed (viscosity material A supply pressure) according to the viscosity of the viscous material A and the size of the gap, the moving speed of the moving means 6, the rotational speed of the rotating means 7, etc. are optimal. It is desirable to obtain the value in advance.
[0026]
(4) After the moving means 6 is advanced by a predetermined length to complete the injection, the rotating means 7 is stopped. And the clamping of the solid PC steel rod 102 by the moving means 6 is cancelled | released, and the pump 53 is stopped. Thereafter, the moving means 6 is returned to the original position.
[0027]
(5) Further, the sandwiching by the rotating means 7 is released and the hollow PC steel bar 101 (the hollow PC steel bar 101 in which the solid PC steel bar 102 is inserted and the injection of the viscous material A is completed) Is removed from the coating means 5, and the cap 110 is removed from the hollow PC steel rod 101, and a leak-proof cap for preventing the leakage of the viscous material A is attached to both ends instead.
[0028]
Such a series of operations, except for the operation of inserting the rear end of the hollow PC steel rod 101 into the coating head 51, the operation of pulling out, and the operation of tightening the chucks of the moving means 6 and the rotating means 7, are performed for each cylinder. This is done by automatically controlling motors, pumps, etc. This control is possible by executing a sequence circuit based on output signals from photoelectric sensors and limit switches provided at predetermined positions.
[0029]
According to this embodiment, there are the following effects.
1) In the injection apparatus 1, the solid PC steel rod 102 is inserted into the hollow PC steel rod 101 while the viscous material A is applied to the outer peripheral surface of the solid PC steel rod 102. Is completely inserted into the hollow PC steel rod 101, the injection of the viscous material A into the gap can be completed almost simultaneously. At this time, the viscous material A reaches the front end of the hollow PC steel rod 101 together with the solid PC steel rod 102 as the solid PC steel rod 102 moves. By moving at a speed, it is possible to inject the viscous material A in a shorter time than in the conventional case of injecting by applying pressure. In addition, since the viscous material A is applied to the solid PC steel rod 102, it is difficult to form a nest at the interface between the solid PC steel rod 102 and the viscous material A, and the viscous material A is more reliable than in the past. Can be injected into. Accordingly, the viscous material A can be efficiently injected into the PC steel bar unit 100 to greatly improve workability.
[0030]
2) Conventionally, the operation of inserting the solid PC steel rod 102 into the hollow PC steel rod 101 and the operation of injecting the viscous material A into the gap between them have been performed in separate steps. Then, since the solid PC steel rod 102 is inserted into the hollow PC steel rod 101 while the viscous material A is applied to the solid PC steel rod 102, the insertion step and the injection step can be performed at the same time. , Work time can be further reduced.
[0031]
3) Since the viscous material A is injected in a state of being applied to the solid PC steel rod 102, it is not necessary to apply a high pressure to the viscous material A as in the prior art. Therefore, it is not necessary to make the gap larger in order to make the pressure work well, and the gap can be made smaller. Therefore, the injection amount of the viscous material A can be reduced and the cost can be reduced accordingly.
[0032]
4) Since the hollow PC steel rod 101 is rotated by the rotating means 7 when the solid PC steel rod 102 is inserted while the viscous material A is being applied, the viscous material A can be injected evenly in the circumferential direction and the filling rate is improved. Can be made.
[0033]
5) Since the screw portion 101A is provided on the outer periphery of the rear end of the hollow PC steel rod 101, when the rear end is inserted into the coating head 51, a gap is generated at the contact portion between the packing 515 and the screw portion 101A. There is a concern that the viscous material A leaks from the gap. However, in this embodiment, since the sealing cap 110 is screwed to the screw portion 101A, a good sealing performance can be ensured by bringing the packing 515 into close contact with the smooth outer peripheral surface 111 of the cap 110, and the viscosity is reduced. The leakage of the material A can be prevented.
[0034]
[Second Embodiment]
FIG. 3 shows a second embodiment as a reference example of the present invention.
As for the hollow PC steel bar 101 of the PC steel bar unit applied to this embodiment, the outer peripheral surface is made smooth over the entire region, and the screw part is not engraved at the end part. On the other hand, a screw portion 102A is formed at the front end of the solid PC steel rod 102, and an anchor nut is attached to the screw portion 102A after the injection of the viscous material A is completed. Therefore, in such a hollow PC steel rod 101, the above-described sealing cap 110 (FIG. 2) can be dispensed with.
[0035]
In the PC steel bar unit composed of these PC steel bars 101 and 102, after the PC steel bar unit is installed in the drilling hole provided in the concrete member, a grout or the like is poured into the tip side of the drilling hole for the anchor. Then, a tensile force is introduced into the solid PC steel rod 102. Thereby, the compressive force as a reaction force with respect to the tensile force can be applied to the concrete member or the like.
[0036]
According to the present embodiment, the effect 5) described in the first embodiment (the effect related to the cap 110) cannot be obtained, but other similar effects can be obtained. In addition, the configuration unique to the present embodiment has the following effects.
[0037]
6) In the present embodiment, contrary to the first embodiment, the cap 110 can be made unnecessary, so that the work time can be shortened by eliminating the trouble of attaching the cap 110.
[0038]
Note that the present invention is not limited to the above-described embodiments, and includes other configurations that can achieve the object of the present invention, and includes the following modifications and the like.
For example, in each of the embodiments described above, the solid PC steel rod 102 is configured to move by the moving means 6, but the solid PC steel rod 102 is moved into the interior by moving the hollow PC steel rod 101. It may be inserted. However, in such a case, in order to apply the viscous material A from the front end to the rear end of the solid PC steel rod 102, it is necessary to provide the application means 5 so as to be movable. There is a disadvantage that the structure becomes complicated. Further, when rotating the hollow PC steel rod 102, it is necessary to provide the rotating means 7 to be movable at the same time, and the structure of the rotating means 7 becomes complicated.
[0039]
In each of the above embodiments, the rotating means 7 is provided so as to be able to rotate the hollow PC steel rod 101. However, the solid rotating means 7 may be rotated by the same rotating means 7, and a pair of rotating means 7 is provided. Both PC steel bars 101 and 102 may be rotated in opposite directions.
[0040]
In addition to the hollow PC steel rod 101 as in each embodiment, the pipe according to the present invention may be a deformed steel pipe provided with a spiral stopper on the outer periphery. Even when such a deformed steel pipe is used, it is desirable to ensure the sealing performance with the coating head 51 by using the cap 110 according to the outer peripheral shape.
[0041]
【The invention's effect】
As described above, according to the present invention, there is an effect that the workability can be improved by efficiently injecting the viscous material into the gap between the pipe and the bar constituting the PC steel bar unit or the like.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing an entire injection apparatus according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a main part of the injection device.
FIG. 3 is a cross-sectional view showing a second embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a PC steel bar unit applied to the present invention.
[Explanation of symbols]
100 PC Steel Bar Unit 101 Hollow PC Steel Bar 102 as Pipe Solid PC Steel Bar 110 as Bar Material Cap A Viscous Material

Claims (4)

A method of injecting a viscous material into a gap between a pipe and a bar inserted in the pipe,
When inserting the rod material into the pipe while applying the viscous material to the outer peripheral surface of the rod material, an application means for applying the viscous material to the rod material is provided on an open end of the pipe. A sealing cap that is attached to the end portion and prevents leakage of the viscous material from the coating means, between the opening side end portion and the coating means. A pipe and a bar, which are provided and provided with a packing which is attached between the sealing cap and the coating means and prevents leakage of the viscous material from the coating means . A method of injecting viscous material into the gap.   The method for injecting a viscous material into a gap between a pipe and a bar according to claim 1, wherein at least one of the pipe and the bar is rotated with respect to the other. A method of injecting viscous material into the gap.   In the method of injecting a viscous material into the gap between the pipe and the bar according to claim 1 or 2,
  A thread is formed on the outer peripheral surface of the pipe,
  The seal cap has a concave and convex surface that engages with the outer peripheral surface of the pipe on the inner peripheral surface, and is provided with a step that comes into contact with the end surface on the open side of the pipe. A method of injecting a viscous material into a gap with a material.   A method of injecting a viscous material into a gap between a pipe having a smooth outer peripheral surface and a rod having a thread formed on the outer peripheral surface inserted into the pipe,
  When inserting the rod material into the pipe while applying the viscous material to the outer peripheral surface of the rod material, an application means for applying the viscous material to the rod material is provided on an open end of the pipe. The part is provided so that it can be held,
  Between the open end and the coating means, a pipe packing is provided that is in close contact with the outer peripheral surface of the pipe and prevents leakage of the viscous material from the coating means,
  Between the bar and the coating means, there is provided a bar packing that has an uneven surface that engages with the thread on the inner peripheral surface and prevents leakage of the viscous material from the coating means. And
  A method of injecting a viscous material into a gap between a pipe and a bar, wherein an anchor nut is screwed into the thread after the bar is inserted into the pipe.

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