JPH07195330A - Doweling device for forming grout pouring hole of hume pipe - Google Patents

Abstract

PURPOSE:To improve the finishing operation of the inner surface of a Hume pipe in its centrifugal formation to make a grout pouring hole. CONSTITUTION:In a doweling device for forming a grout pouring hole in a form 30 for use in a centrifugal formation of Hume pipe A by securely holding together a socket pipe 1, an outer dowel 2 and an inner dowel 3, a push-up rod 5 is movably set through a mounting part 4 for fastening the socket pipe 1, the outer dowel 2 and the inner dowel 3 to the form 30. The inner dowel 3 is formed in a condition of being buried in a fresh concrete 32. After formation, the push-up rod 5 is forced up from the inside of the fresh concrete 32, a dowel draft cap 6 is mounted on the push-up rod and the push-up rod 5 is pulled back down to remove the fresh concrete collected on the inner dowel 3, so that the inner dowel can be moved out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dowel device used for forming a grout injection hole in a fume tube in forming a concrete fume tube.

[0002]

2. Description of the Related Art Concrete fume pipes are often used for underground pipes such as sewers. As shown in FIG. 9, in the fume pipe facility, a blade 35 is attached to the tip of the fume pipe A as a leading conductor, and the fume pipe A is installed by the propulsive force of the jack installed at the rear of the fume pipe A. A so-called propulsion method is being swayed, in which the rock is pushed into the ground and buried while excavating the sand of the blade section 35. In this case, the fume tube A is provided with the grout injection hole B, and after the promotion of the fume tube A is completed, the backfill material (grout) is injected from the grout injection hole B to bring the fume tube A and the ground into close contact. I am trying.

The fume tube made of concrete is generally manufactured by centrifugal molding, but the above grout injection hole B is used.
Conventionally, as shown in FIG. 10, a cylindrical form 30
The taper-shaped outer dowel 2 which contacts the inner surface of the tube, the tubular socket 1, and the taper-shaped inner dowel 3 which is located on the inner surface side of the Hume pipe A are fixed to the mold 30 by the mounting bolts 34.
Centrifugal force molding is performed, and the mounting bolt 34 is removed at the time of demolding to remove the outer dowel 2 and the inner dowel 3. As shown in FIG. The hole and the holes 33a and 33b formed by both dowels 2 and 3 communicate with each other to form the grout injection hole B.

[0004]

By the way, the mounting position of the inner dowel in the production of the fume pipe A is finished by plus or minus zero or 0.5 to 1 mm with respect to the height of the concrete finishing surface a. (See FIG. 4),
After that, finishing work is performed with a trowel to smooth the inner wall surface of the pipe.

The finishing work with a trowel is carried out by applying the trowel to the inner wall surface of the pipe by a person or using a machine. Since the driving rotational speed of the pipe during centrifugal molding is 30 to 34 G, which is an extremely high speed, that state Inner dowel 3 with slightly protruding iron
If you hit, the iron will be blown away, creating a very dangerous working environment. By the way, there are also cases in which it caused a personal injury in the past. In addition, the dowels themselves are significantly worn out and frequently replaced. Therefore, although efforts have been made to eliminate the above work form, the present situation is that the complete solution has not been reached yet.

The present invention has been made in consideration of the above-mentioned conventional circumstances. Even if the inner dowel is attached to a position lower than the concrete finishing surface so that the finishing iron is not blown off, the latter grout injection hole is not provided. The formation is reliable and reliable,
Provide a dowel device for forming a grout injection hole, which can be easily performed, can prevent accidents due to trowel splattering, damage or wear of dowels, can be easily finished and can finish the inner wall surface of the pipe well. It is what

[0007]

The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. The present invention is to grout a concrete fume pipe A for centrifugal molding. The socket tube 1, the outer dowel 2 and the inner dowel 3 installed to form the injection hole B
In an apparatus equipped with
A mounting tool 4 that is inserted into the inside of the mold 30, is detachably coupled to the inner dowel 2, and is detachably fastened to the formwork 30.
And a push-up rod 5 that is loosely inserted into the guide pipe 15 of the fixture 4 and can be pushed out to the inner surface side of the fume pipe A after centrifugal formation of the fume pipe A, and detachably attached to the tip end portion of the push-up rod 5. The inner dowel 3 is connected by pulling back the push-up bar 5.
It is characterized in that it is provided with a dowel removing cap 6 that cuts into and removes the fresh concrete 32 covering the end surface of the above.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the device of the present invention includes a socket tube 1 embedded in a concrete 32 of a fume tube A, an outer dowel 2 interposed between one end of the socket tube 1 and a mold 30, It is composed of an inner socket 3 to be engaged with the other end of the socket tube 1, an assembling tool 4 for connecting the above three members 1, 2 and 3, a push-up rod 5 and a dowel removing cap 6 used for removing the dowel after molding. Has been done.

The socket tube 1 is a pipe for injecting grout.
It has a diameter that allows 36 (see FIG. 8) to be inserted, is formed to have a length of about 1/2 to 1/3 of the thickness of the concrete 32, and is attached to the reinforcing bar in the formwork 30 by welding. . The outer dowel 2 is formed in a taper shape in which the side in contact with the mold 30 is thick and the side in contact with the socket tube 1 is thin.
A shaft hole 7 through which a guide pipe 15 of an assembling tool 4 described later can freely pass
Is provided.

The inner dowel 3 is provided with a mounting shaft portion 9 having an outer screw projecting from a small diameter end of a main body 8 formed in a taper shape in which the side in contact with the socket tube 1 is thin and the other side is thick. A shaft hole 10 is provided through which the push-up bar 5 can freely pass. Further, the large-diameter end portion of the main body 8 is provided with a recessed portion 11, in which a rubber lid plate 13 having a cross cut 12 in the central portion is flush with the main body 8, Screw 14, 14
It is detachably attached by.

The mounting tool 4 has a diameter that allows the push-up bar 5 to pass therethrough, an enlarged head 16 is provided at one end, and an external screw 17 is provided at the other end over a considerable length 15 When,
It comprises a tightening nut 18 screwed to the outer screw 17 and a cap-shaped mounting nut 19 which is loosely fitted to the guide pipe 15 and is detachably screwed to the mounting shaft portion 9 of the inner dowel 3. .

Further, the push-up rod 5 has a pointed portion 22 having a diameter larger than the inner diameter of the guide pipe 15 via a neck portion 21 having a required length at one end of a rod body 20 having a diameter allowing free passage in the guide pipe 15. Further, a stopper 23 having a diameter larger than the inner diameter of the guide pipe 15 and smaller than the outer diameter thereof is provided at the other end of the rod body 20. The push-up bar 5 has a tip 22 protruding outward from the enlarged head of the guide pipe 15 and a stopper 23 protruding from the other end of the guide pipe 15 to play inside the guide pipe 15. Is inserted. In this case, if the tip 22 or the stopper 23 is detachably attached to the rod body with a screw or the like, the above-mentioned loose insertion is possible.

The dowel removing cap 6 is a disk-shaped main body 24 having a diameter larger than that of the main body 8 of the inner dowel 3.
An annular edge 25 having a diameter substantially equal to that of the large-diameter portion of the main body 8 is projectingly provided on one surface side, and a shaft hole 26 having a diameter substantially the same as the shaft hole 10 of the inner dowel 3 is formed in the shaft center portion. It is provided.
Further, on the other surface of the main body 24, a stopper plate 27 having a locking groove 28 that can be engaged with the neck portion 21 of the push-up bar 5 is attached rotatably in a horizontal direction around a pin screw 29.

Next, an example of use of the above device will be described. First, as shown in FIG. 3, the socket pipe 1 is attached to the rebar (not shown) of the fume pipe A arranged in the formwork 30.
Welded together with the outer dowel 2 in between. On the other hand, with the stopper 23 of the push-up bar 5 removed, the push-up rod 5 is inserted into the guide pipe 15 of the assembling tool 4 and is again stopped.
23 is attached, the assembling tool 4 and the push-up bar 5 are put together, and then the inner dowel 3 is attached to the assembling tool 4 by screwing the mounting nut 19 and the mounting shaft portion 9. And the guide pipe
With the tightening nut 18 removed from the 15,
15 through the socket tube 1 and the shaft hole 7 of the outer dowel 2, and further through the mounting hole 31 previously opened in the mold 30
If the inner dowel 3 is pressed out to the socket pipe 1 and the dowel device is assembled, the inner dowel 3 is brought into pressure contact with the socket pipe 1 by projecting it outside 30 and screwing the tightening nut 18 into the guide pipe 15. in this case,
The end face of the inner dowel 3 is set at a position lower than the finished surface a of the concrete to be formed by 5 mm or more.

Next, if concrete is poured into the mold 30 and the mold 30 is rotated at a high speed, the centrifugal force causes
As shown in FIG. 4, the fresh concrete 32 has a tubular shape with a predetermined thickness, and the dowel device is a fresh concrete.
It will be buried in 32. In this case, since the upper shaft hole 10 is closed in the cover plate 13 of the inner dowel 3, the pouring concrete is prevented from entering. After the centrifugal molding, while further rotating the mold 30, a finishing trowel (not shown) is manually applied to the inner surface of the tube to smooth the inner surface of the tube for finishing.

Before releasing the molded fume tube A from the mold, as shown in FIG.
30 Push in from the outside as shown by the arrow. Thereby, the point 22 pushes open the cross cut 12 of the cover plate 13, and then breaks through the fresh concrete covering the end face of the inner dowel 3,
The push-up rod 5 is projected on the inner surface of the fume tube A.
Is pushed up until its stopper 23 hits the end face of the guide pipe 15. Therefore, as shown in FIG. 6, the dowel removing cap 6 is inserted into the protruding push-up bar 5 in a direction in which the annular edge 25 contacts the concrete 32. At that time, the stopper plate 27 is rotated so as not to block the shaft hole 26. Then, when the push-up bar 5 projects from the shaft hole 26, the stopper plate 27 is rotated to engage the locking groove 28 with the neck portion 21, and the push-up bar 5 is pushed.
Do not get out.

In this state, if the tightening nut 18 is tightened, as shown in FIG. 7, the push-up bar 5 is pulled back with the stopper 23 as shown by the arrow, and the dowel removing cap 6 has its annular shape. The edge 25 bites into the fresh concrete 32 and comes into contact with the outer circumference of the large-diameter end surface of the inner dowel 3. The fresh concrete covering the end surface of the inner dowel 3 is destroyed and removed.

After that, the tightening nut 18 is removed, and the assembling tool 4 and the push-up rod 5 are pushed out to the inner surface side of the fume pipe A. Then, the inner dowel 3, the assembling tool 4, the pushing-up rod 5 and the dowel removing cap are removed. Both 6 will escape. Then, the form 30 is removed, and the outer dowel 2 is pulled out. As shown in FIG. 8, with the socket tube 1 inside, dowel holes 33 are provided at both ends thereof.
Thus, the grout injection hole B in which a and 33b communicate with each other is formed.

[0019]

As described above, according to the present invention,
The fume tube can be centrifugally formed by embedding the inner dowel in the concrete, and therefore, in the conventional inner surface finishing of the fume tube, the finishing iron comes in contact with the inner dowel, which causes a great deal of labor to the worker. The machine does not damage the machine even in the case of machine finishing, and it prevents damage or wear of the inner dowel, contributing to the improvement of work safety and the economical efficiency of the device. To do.

[Brief description of drawings]

FIG. 1 is a front sectional view of an assembled state according to an embodiment of a device of the present invention.

FIG. 2 is a front sectional view showing each member separately.

FIG. 3 is a front cross-sectional view showing a state in which the apparatus of the present invention is mounted on a mold.

FIG. 4 is a front cross-sectional view showing a state of the same centrifugal molding.

FIG. 5 is a front cross-sectional view showing a state where the push-up bar is projected from fresh concrete.

FIG. 6 is a front sectional view showing a state in which the dowel removing cap is attached.

FIG. 7 is a front cross-sectional view showing a state in which the dowel removing cap is digged into fresh concrete.

FIG. 8 is a front sectional view showing a grout injection hole formed by the device of the present invention.

FIG. 9 is a vertical cross-sectional view illustrating a propulsion soil for a fume tube.

FIG. 10 is a front cross-sectional view showing a conventional device.

FIG. 11 is a front sectional view showing a conventional grout injection hole formed.

[Explanation of symbols]

 A Hume pipe B Grout injection hole a Concrete finish surface 1 Socket pipe 2 Outer dowel 3 Inner dowel 4 Assembly tool 5 Push-up rod 6 Dowel removal cap 7 Shaft hole 9 Mounting shaft part 10 Shaft hole 12 Lid hole 13 Cross cut 15 Guide pipe 18 Tightening nut 19 Mounting nut 21 Neck 22 Point 23 Stopper 25 Annular edge 26 Shaft hole 27 Stop plate 28 Lock groove 30 Formwork 31 Mounting hole 32 Fresh concrete

Claims (1)

[Claims] In a device equipped with a socket tube, an outer dowel and an inner dowel, which is installed to form a grout injection hole in a concrete fume pipe to be centrifugally molded, the device is inserted into the form through the mounting hole of the form, A fitting that is detachably coupled and that can be detachably fastened to the mold, and is loosely inserted into the guide pipe of the fitting, and can be extruded to the inner surface side of the fume tube after centrifugal molding of the fume tube. And a push-up rod that is detachably coupled to the tip of the push-up rod,
A dowel device for forming a grout injection hole in a fume tube, comprising a dowel removing cap that bites into and removes the fresh concrete covering the end surface of the inner dowel by pulling back the push-up rod.