JPH0430886B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing a concrete screw structure.

Conventionally, screw structures have been formed by cutting or rolling metal or synthetic resin, and have been widely used as connection means, but there are no screw structures made of concrete or cement mortar. This is because the material cannot be processed by cutting or rolling, which are the usual means of forming threads.

As a method for forming threaded structures such as concrete, which were considered impossible, the present invention uses a surface formwork in which the grooves of flexible flat plates with uneven grooves on the surface are shifted and connected in a cylindrical shape. Fresh concrete or cement mortar, etc. is poured into the surface formwork provided in the places where screws are required, compacted by vibration or centrifugal force, and after curing, is removed from the flexible flat plate. Threads are formed by peeling off the surface formwork.

Hereinafter, the configuration and manufacturing process of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows the surface formwork 2. FIG. This surface formwork 2
The grooves are cut out from a flat plate having a parallel pattern of groove stripes on the surface consisting of convex portions 3 and concave portions 3'. That is, if the flat plate shown by the dotted line is cut out as shown by the solid line and the end portions 4 are joined, the protrusions 3 and recesses 3' are connected, one each, and form a screw shape. The surface formwork 2 may be made of any material that is flexible and has excellent abrasion resistance, such as vinyl chloride board or rubber. The purpose of attaching the magnetic sheet 5 is to improve the adhesion to the molds 6, 6'', etc., thereby adjusting the shape of the screw.

FIG. 2 shows the process of forming a concrete screw structure using this surface formwork 2. Figure 2a
Figure 2b shows the concrete 1 poured into the formwork 6 with the uneven parts 3 and 3' of the surface formwork 2 facing inside, and Figure 2b shows the surface formwork 2 placed in the direction indicated by the arrow after the formwork 6 has been removed. Shows the process of peeling off in the direction. Figure 2c
and d show the state in which a female thread is formed, and the surface form 2 has the uneven parts 3, 3' wound outward around the inner form 6'', and concrete is placed between the outer form 6' and the bottom form 6''. The difference is that 1 is driven in, but the formwork 1',
1'' and 1〓 are removed, the surface formwork 2 is peeled off to make a female concrete thread.In addition, when winding with the uneven parts 3, 3' of the surface formwork 2 on the outside for a female thread, How to cut out the surface formwork 2
As shown in Fig. 3, groove stripes are formed downward to the left. In addition, when winding the surface formwork 2 and joining the end portion 4, the convex portion 3 and the convex portion 3,
If the recesses 3' and 3' do not connect correctly, the threads will shift and the screw will not form. As one method to prevent this, as shown in FIG.
Magnet sheet 5 so that it is parallel to the top and bottom edges of
At the same time, as shown in Figure 3c,
When the surface form 2 is wrapped around the fitted inner form 6'' with a magnet sheet 5' which has been cut in advance so that the magnet part 7' is parallel and glued into a cylindrical shape, the magnet part 7, 7' are indexed together by magnetic force, so the screw threads do not shift.Furthermore, as shown in FIG. 4, the surface formwork connection piece 8 Cut it out and attach it to the surface formwork 2 using double-sided adhesive tape 9.
By adhering both ends 4 of the screw thread, displacement of the thread can also be prevented. This surface formwork connection piece 8
As shown in Fig. 5a, a notch 11 is formed in a part of the threaded part 10 of the concrete screw 1, but as shown in Fig. 5b, the end 4 of the surface formwork 2 is separated. This prevents the formation of a protrusion 12 on the threaded portion 10 of the concrete screw 1 and the fatal defect that it cannot be screwed into the concrete. Generally, the thicker and harder the surface formwork 2 is, or the smaller the thread diameter, the more likely the protrusion 12 will occur on the threaded portion 10.
Of course, in the case of a male thread that can be tightened with the formwork 6 on the outside of the surface formwork 2, this problem is less likely to occur. However, if it is necessary to increase the thread size and make the surface formwork 2 thicker, it is difficult to prevent the threaded portion from deforming using the method described above, so winding it into a cylinder will result in a threaded shape. We propose a method using flexible strings.

6a and 6b show the structure of the string formwork 13. FIG. An end portion 14 of a string-like formwork 13, which is made by pasting a convex portion 3 to a flat string serving as a recessed portion 3' with double-sided tape or the like, is cut diagonally by one turn. FIG. 6a shows a string-like formwork 13 for a female thread, and FIG. 6b shows a string-like formwork 13 for a male thread.If the string-like formwork 13 is wound around the inner formwork 6'' with the protrusion 3 on the outside, the formwork will form a female thread, and the formwork 6 A formwork for a male screw is obtained by winding the material with the protrusion 3 on the inside.At this time, if the flat string forming the recess 3' is made of magnetic sheet and the formwork 6, 6'' etc. are made of iron, Although it has the advantage of being able to be wrapped smoothly, it does not necessarily need to be made of the above-mentioned material, as long as it is flexible enough to be wrapped, and the shape of the convex portion 3 is not trapezoidal as shown in the figure, but a semi-half shape. It may be circular and have a shape that allows the recess 3' to easily engage therewith, or it may have the cross-sectional shape of a metal screw.

Next, specific examples of the present invention will be described.
The first example is a lid/stand 1 made of FRC material.
FIG. 7a shows the container 15 with a lid on, and FIG. 7b shows the container 15 as a stand. The container 15 is made by expanding the surface formwork 2 as shown in Fig. 1 and constructing a frame with a height that has a thickness of four circumferences, and then pouring cement mortar and glass fiber or carbon fiber into it, and when it begins to harden a little, the frame with four circumferences is formed. , as shown in Figure 2 a.
After tightening with the formwork 6 with FRC inside, FRC is driven into the bottom, and after hardening and curing, the mold is removed and the surface formwork 2 is peeled off.
It was manufactured by replacing the concrete 1 shown in Figures c and d with FRC and then post-casting the bottom with FRC on a female thread, and it can be used as a vase, a pen stand, or a container with a lid.

The second embodiment is applied to the Himum tube. By providing a threaded hole in the pipe wall, the branch pipe can be connected easily and reliably, and it can also be used for multiple purposes, such as being able to be closed after use as a water collection hole.

Figure 8 shows Huyum tube 1 with screw holes in the tube wall.
7 is shown. The hume pipe 17 is a normal B-shaped pipe except that it has a screw hole and that the hole is reinforced with an annular reinforcement 25. Therefore, socket part 1
8. It has a spigot portion 19, and is reinforced with a spiral striation 24 and a vertical striation 23. This Himmu tube 17
To make the tube, first prepare an inner mold 6'' shown in Fig. 2c, which can be attached to the hume tube form during mold assembly, wrap the surface form 2 around the inner mold 6'', and follow the normal pipe manufacturing method. After manufacturing the mold and removing the inner mold 6'', the surface mold 2 can be peeled off. Figs. 9 a to b
1 shows concrete members such as a branch pipe 20, a water collection valve 21, a waterproof plug 22, etc., which are attached to the screw hole-equipped Himumu pipe 17. If the branch pipe 20 is screwed in as it is or in combination with mortar, joint material, putty, rubber string, etc., it will have a great water-stopping effect, and if used in conjunction with an elastic joint material, it will prevent breakage during uneven settlement. can. Also, by processing the socket part 18' of the branch pipe into a female thread and connecting it with a screw,
This is a more complete connection than using a regular rubber ring. The water collection faucet 21 is provided with several tapered circular water collection holes 26, and the water collection faucet 21 is provided with several tapered circular water collection holes 26.
7 so that the smaller diameter of the water collection hole 26 is on the outside, the water collection hole 26 will not become clogged with earth and sand, and will have a water collection effect for a long period of time. The waterproof plug 22 can be used as a leak-free water conduit by removing the water collecting plug 21 and screwing in the prevention plug 22 when water collection is no longer necessary. It is difficult to plug a large opening from inside a pipe, but if the hume pipe 17 is installed, waterproofing can be easily achieved by screwing in the preventive stopper 22 together with the joint material, etc. . In the above, the hume pipe 17 has been illustrated as a B-shaped pipe, but the same applies to an A-shaped pipe without the socket part 18 and spigot part 19, a C-shaped pipe, a propulsion pipe, and even an unreinforced concrete pipe without reinforcing bars 23 and 24. The effects can be expected. The first and second embodiments are both based on threaded connections of FRC and concrete screw structures, but one is a combination of screw structures such as concrete and the other is a steel pipe or synthetic resin pipe. will be disclosed as a third embodiment.

FIG. 10 shows a steel pipe-concrete composite column that is screwed together. The concrete pillar 27 is the second
As shown in Figure a, the surface formwork 2 is attached in advance during mold assembly, and is manufactured by a normal method for manufacturing centrifugal prestressed concrete poles, except for the step of peeling it off after demolding. Therefore, the fixing tool 3
0, reinforced with PC steel rods 31 and spiral reinforcements 24. The upper column 28 has a lid on its upper end and a screw connection part 29 formed by adhering the surface form 2 or the string form 13 on the inside of its lower end. This connection is made after the pillar 27 is erected or prevented from rotating.
This is done by fitting and screwing in the threaded connection part 29 of the upper column 28. For this screwing, if a scaffolding bolt is inserted into the scaffolding socket 32 and turned, it will be possible to connect the pillar more easily. In addition to mechanical strength, the properties required for connecting columns are that the connecting columns are easy to work with, do not separate during use, and, if possible, can be easily separated and reused when rebuilding. There is. Conventionally used steel pipe joint columns such as Panzer masts have a joint structure with tapered parts that fit together, so there is a risk of accidents such as poles erected in valleys coming off due to vibrations caused by the wind pressure of the overhead wires. Ta. In addition, welded or plug-in type axes must be treated as connecting columns when rebuilding, and are not as good as the threaded connecting column method according to the present invention. In addition, in this embodiment, a steel pipe with high tensile strength was effectively used as a female thread, but a steel pipe with a screw hole in a flat plate and sufficiently reinforced, like the screw hole of the Huum pipe 17 in the second embodiment, was used. In this case, surface formwork 2 or string formwork 1 is attached to the PVC pipe.
It can be used by wrapping and gluing 3 etc. around the outer periphery and screwing together as a male thread.

As mentioned above, the present invention includes cement mortar products such as FRC as examples, Huyum pipes as concrete structures, and composite concrete joint columns as screw connection structures of concrete and steel pipes, etc.
The present invention is not limited to these examples, but extends to screw structures made of cement mortar, concrete, etc. In addition, as a method for forming screws, we have proposed a method in which concrete or the like is poured into the surface formwork 2 or string formwork 13, compacted, and then peeled off, which is different from the conventional methods of cutting or rolling. However, there is no alternative to injection molding, as the injection molding method cannot remove the threaded part using a normal iron formwork, etc., and that resins with a low coefficient of friction such as fluororesin or silicone resin are used as the material for the formwork. Even if it is used as a screw, it is difficult to create anything other than a limited number of simple screw shapes.
A shape memory alloy with an appropriate thread diameter and pitch is filled in the core of the string-like formwork 13 in advance, and when the mold is assembled, the temperature is raised to a predetermined temperature to adjust the thread shape, and after forming, the string-like formwork 13 is pulled off. The method of forming a thread by this method falls within the scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is a plan view of the surface mold for forming a threaded structure of the present invention, b is a side view, and FIG. 2 is a perspective view showing the process of forming a threaded structure.
Figures a and b are male threads, c and d are diagrams showing the formation of female threads, and Figure 3 is a diagram showing means for preventing the screw grooves from slipping, where a is a plan view of the surface formwork and b is the same formwork. Fig. 4 is a perspective view showing means for preventing displacement of the thread groove by adhesion of the surface formwork connection piece, Fig. 5 a and b
6A and 6B are a sectional view showing a state in which the thread groove is prevented from being deformed by using the surface formwork connection piece, and a sectional view showing the deformed state when the surface formwork is not used, and FIGS. 6a and 6b are plan views showing the string-like formwork, respectively. 7 is a side view of a half-cut cross-section of the FRC container with a lid and stand according to the first embodiment, in which a is a lid and b is a view showing use as a stand; FIG. FIG. 9 is a cross-sectional side view of an upper half of a humum pipe with a screw hole according to the second embodiment, and is a diagram showing a member screwed into the humum pipe with a screw hole 17, and a is a half cross-sectional view of a branch pipe. , b is a half-sectional view of the water collection faucet, c is a half-sectional view of the waterproof faucet, d is a plan view of the water collection faucet, and FIG. 10 is a side view of the half-cut cross-section of the composite concrete joint column according to the third embodiment. It is.

Claims (1)

[Scope of Claims] 1 A surface formwork having a plurality of grooves and grooves extending obliquely and parallel to each other is formed from a flexible flat plate having a plurality of grooves and grooves extending parallel to each other on the surface, and the grooves are on the inside. The surface formwork is made into a cylindrical shape and placed in the formwork as shown in FIG. A method of manufacturing a concrete screw structure to be formed. 2. The manufacturing method according to claim 1, wherein the surface form is comprised of a flexible string that becomes thread-shaped when wound into a cylinder. 3 Consisting of a formwork and a surface formwork placed within the formwork, the surface formwork has a plurality of uneven grooves extending obliquely and parallel to each other on the surface, and the surface formwork has a plurality of uneven grooves extending diagonally and parallel to each other. The plurality of diagonal and mutually parallel uneven grooves cut diagonally the periphery of a flexible flat plate that is rolled inward into a cylindrical shape and inserted into a formwork, and has a plurality of parallel grooves on its surface. A manufacturing device for a concrete screw structure, characterized in that it is formed by: