JPS60132115A - Screw structure made of frp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention prevents corrosion or galvanic corrosion and is electrically insulating. This relates to a screw structure of FRP with high mechanical strength and a bolt/nut.

Conventional Pol 1 Nano 1 type anchor bolts are generally made of hot-dip galvanized steel or non-rusting metals such as stainless steel, but there are always problems with water leakage and cement build-up in tunnels. Corrosion and electrolytic corrosion are severe in locations affected by alkali, coastal areas, ships and other locations affected by seawater, and underground structures, making it difficult to prevent this and requiring replacement in a short period of time. There wasn't.

Therefore, the labor and expense required for this process were to be avoided, and anti-corrosion measures were strongly recommended.

For this reason, some thought has been given to using resins such as polycarbonate or nylon that are not susceptible to 1115 corrosion or electrolytic corrosion, but have low mechanical strength and have a tensile strength of 7i:! for anchor bolts, etc. I couldn't add i.

Furthermore, glass roving with excellent mechanical strength is made of epoxy +
The tensile strength of FRl-' lot etc. bonded with 61 fat is 7 (,1-1(l fl kB/m+n'
3. Structural steel with grade.・1・～5(eyes 'B'/'
There is also a resin thread 4 which has the right strength to distinguish between Ill Ill 2, but when used for anchor bolts, etc., there is a problem with the strength of the faL part, so when cutting threads, use forceless fiber M1.] Because of this, the strength of the hU section was 1 degree lower than that of pole section 1, and it was not possible to use an anchor bolt or the like as pole section 1.

That is, the conventional metric or trapezoidal shape, or the
：1″奄１Neshihej: Soil, 1 all freshly screwed 1 beg t:
+:'+<P lot of glass)&, t(l is cut by 'tj at the threaded thread, 2 and, in these conventional threaded #+Vi constructions, the tensile force acts as a shearing force of 110 Due to its structure, it was not possible to use FRF' by significantly reducing its own strength.Therefore, FRF' had mechanical strength greater than that of structural steel, as well as superior corrosion resistance and electrical insulation. However, due to the lack of a suitable means of joining with other materials such as metals, FRP rods were rarely used except when used as is or by joining them with metal fittings. .

Also, when cutting bolts from FRP rods, the glass fibers in the head part are cut when creating the bolt head, which significantly reduces the tensile strength of the head part that protrudes from the bolt shaft. The current situation is that it does not function as a head and cannot be used as a bolt.

It is also possible to consider a method in which glass rovings are placed in a bolt shape in advance in a mold and then bonded by injecting epoxy (HJ resin), but this method is not economical in terms of production cost and cannot be used generally.

The present invention solves these problems and makes it possible to combine metals, 4Ai fat, and other structural materials without reducing the structural characteristics of FRP lots, which have excellent corrosion resistance, mechanical strength, and electrical insulation. The present invention provides an economical method for providing bolts and bolts with l-" RP threads and bolts that enable geometrical joining.

As shown in Figure 1, at the threaded part of FIP,
A pile of steeply sloped conical truncated cones 3 that are pressed against and received by a steeply sloped one-way sloped surface 2 that widens toward the end of the tension knife in the axial direction. 1
and an IQ mouth part 5 which is inclined in one direction, extends in one direction with a reverse taper, and screws into the slope 2'', which covers and presses the slope 2.
This is the mesh structure of FRI' consisting of.

For example, as a bolt nand with this screw structure,
As shown in the figure, 11 units of steeply sloped circles are made of FRP fronts made of glass rovings or glass cloth bonded with epoxy resin, and are designed to absorb axial tensile force on long, steeply sloped surfaces: 3 A glass cloth having a bolt 1 having a convex threaded part 4 having a convex threaded part 4, and a gate upper part 5 screwed onto a steeply sloped one-way inclined surface 2 of the convex threaded part 4 of the bolt 1. FR combined with epoxy + 61 fat
It consists of 6 PCs.

FIG. 2 shows a steeply sloped circular structure: a case where some columnar parts 7 are left at the bottom of the platform 3. If this cylindrical portion 7 is made large, the surface area of the unidirectionally inclined surface 2 that receives the tensile force will increase and the shearing force within the screw thread will increase, so it must be selected to provide overall strength.

Next, the head 8 of the bolt 1 is shown in Figure 1 and Figure 2 is a circle 41: Either it is trapezoidal to give the head tensile strength, or it can be made into a normal bolt shape as shown in Figure 3. , f:1
51 and 2, a convex threaded part 4' is provided in the head of the bolt 1 with a reverse taper and a stack of steeply sloped conical truncated cones 3, and a gate is tightly screwed into this convex threaded part 4'. Glass cloth that connects the threaded part 5' is bonded with epoxy resin +-''r<p.The head 9 is made of epoxy +j (combined with oil and screwed and bonded together.RP I).The shape of the head 9 is as follows. , round, hexagonal, or other desired shape.

Incidentally, increasing the thickness of the FRP nut 6 and the FRP head 9 increases the tensile strength and removes the problem, but compactness can be achieved by setting the thickness commensurate with the required tensile strength.

By adopting the above-mentioned structure, the screw structure of the H' of the present invention reduces the decrease in strength due to freshly twisted rods, and is suitable for manufacturing FRP bolt nuts or FRP bolts.
This makes it possible to connect RP rods or FRP plates with other structural shrines such as metal.

Next, the most important tensile strength in the F"RP neck structure of the present invention was improved in the first layer 1.
As shown above, the screw structure is received by a long, steep, one-way inclined surface 2 that widens toward the end in the axial direction, and is received so as to be suppressed.

Conventional, male screw, trapezoidal screw, or saw 1”
1. Even if you look at it, these mesh structures are FRP mouth.
When applied to the glass fibers, the glass fibers are shredded and
Since the tensile force has a structure in which it acts properly as a shearing force on each pile, the result is 11 of the most fatal gumeno when F+<p. In the present invention, this force is received as a pushing force by the steep one-way inclined surface 2 and the wide inclined surface 2'', which acts to open the convex screw portion 4 and the gate connecting portion 5. This is due to the structure in which the shearing force is reduced as much as possible and is applied as a compressive force to the FR,l'' thread surface.

The test results showed that F was made by bonding 70u+t% of glass roving with epoxy resin to bolt j as shown in Figure 1.
When using RP Ronro, the compressive strength of the FRI-' rod itself is 51) kg/mm, and the tensile strength is (3 (
lI+g/+am2 and 34-5 (1, l+
Although it has a strength comparable to or higher than that of B/+n+n2, if a conventional metric thread is attached to it, for example, the tensile strength is approximately 1720 3 kB/' m
'm 2Iiij later L', the mountain was broken+i'+. In the cage structure of the present invention as shown in Figure 1, the tensile strength was approximately 301 (ε/111+n'), which is close to that of structural steel, and was sufficiently durable for use.

In addition, in the case of the FRI') bolt 1 of the present invention, since the tensile force acts as a compressive force on the FRI) bolt 1, the glass roving, which has strong tensile strength and compressive strength, or
Wrap glass cloth to the required diameter, or alternately wrap glass roving and glass cloth? += Glass fibers combined with i and bonded with epoxy resin
l:(], -'I use a potter's wheel, but in order to increase the twist by 1 l, I use a force-stretch cloth or a combination of glass roving and glass cloth.
That's fine. Next, FRP.

In the case of Toro, the tensile force is +11j in the Jj direction that pushes the F17P nut apart, so a strong glass cloth is laminated on this and epoxy + A (I"[< l
-', the tensile strength is 30 to 8/vo
The tensile strength of 2 or 1 is determined by (a) or (a).

Historically, in [・l<I'pol 11, the glass roving j1・1 and the glass cloth layer were laminated concentrically and solidly, and the rod of the present invention was bonded with epoxy (!"1j resin bonded l'RI-"). By applying the Ka-shi structure, it is possible to create an I-" IP bolt with both high torsional strength and tensile strength.

Also, use carbon fiber instead of glass cloth,
If you use a rod that uses both, you can significantly increase the strength. Therefore, PR depending on the application
]) By using ku and d, both strength and symmetry can be satisfied.

Next, as an effect of the bolt nut of the present invention, since [-RIil is used for both bolts and nuts, it is resistant to corrosion and electrolytic corrosion, and also has mechanical strength close to that of metal (;I), so it can be buried in the soil. It can be used without fear of corrosion even when used in areas such as coastal areas and ships where corrosion is severe due to seawater.

In addition, since it is electrically lIA-rimmed, it can be used in locations that require electrical insulation in addition to corrosion protection and mechanical strength.

Furthermore, the bolt nut of the present invention, bolt or naso i.
Can also be used alone. For example, when bonding a resin or ceramic plate for corrosion protection or electrical insulation to a metal plate,
A metal plate is provided with a threaded hole having the threaded structure of the present invention, and a resin or ceramic plate is attached to the threaded hole using the bolt of the present invention.
Alternatively, you can use a resin or ceramic plate sewn onto it.

As described above, by using the threaded structure of the present invention and the bolt/nut, it is possible to achieve the excellent anti-corrosion ability, mechanical strength, and electrical insulation properties of the conventional F'RP® S. However, since there is no good way to bond it to metals or other resins, its uses are limited other than when it is used as a single FRP rod or as an integrally molded product such as a container. By using the threaded structure and bolt nuts of the present invention, it is possible to connect (without maintaining geometrical strength) RP rods, FRP plates, I''RP molded products, and metal or ceramic products. It is easy to self-extinguish and can be used in combination.
[It has a great effect] It is possible to make X11.

Furthermore, the length of the steeply sloped one-way slope 2 can be selected depending on the type of gourd needed, making it an excellent hat that can be used for everything from small objects to elaborate coffin structures. It has many effects and 14 symptoms.

[Brief explanation of drawings]

11'; J, 1, 14 is an illustrative diagram showing a partial cross section of the present invention, and Figure 3 is an exemplary explanatory diagram showing a partial cross section of the threaded joint of the present invention. 1 is a bolt of 1・'Rl', 2.2゛ is a one-way inclined surface, 3 is a steeply sloped truncated cone, 4.4' is a convex threaded part, 5.5゛ is a concave threaded part, 6 is F RP nut, 7 is the cylindrical part of the convex thread part 4, 8 is the FII)' circle 11 trapezoidal head of pol 11,
5] is an FRP head. Soden Shrine 21 for Patent Applicant - Industry Co., Ltd. 11 Representative Miki Kawamoto' (f3

Claims (1)

[Scope of Claims] (3) In the threaded portion of the FRP, a steep slope that presses and absorbs the tensile force in the axial direction with a long one-directional slope that widens towards the tensile direction. It consists of a convex screw part with a stacked shape of 411 circles, and a gate screw part with a reverse taper unidirectional slope screwed in close contact with the one-way inclined surface of this convex screw part and pressing it. The structure of FHP is characterized by this. (2) The F' RP rod, which is made by bonding glass roving or glass cloth with epoxy 1b1 resin, receives the tensile force in the axial direction on a steep slope in one direction. A bolt with a convex ridge in the shape of a truncated cone, and how steep is the bolt in one direction?
A bolt nut comprising an FRF sheet made by laminating glass cloth having concave threads that tightly screw onto a slope and bonding them with epoxy resin. (3) In the bolt napht of claim (2), the bolt head has a lower convex thread portion and a convex thread portion in the stacked shape of a steeply sloped truncated cone with a reverse taper, and this convex thread QVa is a bolt nut whose F RF' head is made by bonding a glass cloth with a gate part that tightly screws into the part with epoxy resin, and is integrated by threading and bonding together with epoxy resin.