JP2024039693A - Groutless threaded joint socket joint - Google Patents

Abstract

[Problem] Conventional sockets for connecting two threaded joint bolts are made by removing the knots and ribs of deformed rebar and processing the base material, utilizing the incomplete threaded portion, machining metric screws, etc., and connecting using a threaded joint. This requires cutting the base material rebar at both ends and thread processing for each bolt, which increases the number of processes and increases costs. [Solution] A threaded socket joint that connects two specially shaped threaded bolts, the number of threaded threads is 5 or more, i.e., 10 or more threaded threads from both ends, the interval between the nodes of the male thread of the threaded bolt and the nodes of the female thread of the threaded socket joint are equally spaced, the screw-in angle of the nodes of the male thread of the threaded bolt and the screw-in angle of the female thread of the threaded socket joint are equal, and the height of the nodes of the male thread of the threaded bolt and the screw bottom height of the threaded socket joint are equal, thereby providing a socket that completely fits the nodes of the male thread of the threaded bolt and the nodes of the female thread of the threaded socket joint, which does not require grout material when connecting and can reduce costs. [Selected drawing] Figure 2

Description

The present invention relates to a technique for connecting two threaded bolts without using grout, and relates to a threaded bolt and a threaded socket joint for groutless construction.

Many inventions have been made regarding joints and the like that connect two threaded reinforcing bars and threaded bolts to ensure connection performance.

The invention of Patent Document 1 provides an incomplete threaded portion of a male threaded portion that can satisfy both the requirements for tensile strength and compressive strength, and can reduce costs by reducing the number of parts while increasing versatility. We offer fittings that utilize

The invention of Patent Document 2 provides a joint in which a threaded sleeve is inserted into the end of a deformed steel bar, the diameter of the deformed steel bar is reduced with a die, and the reinforcing bars are connected with bolts.

In the invention of Patent Document 3, when connecting threaded joints of reinforcing bars in a fixed state, the coupler usually tends to become long to accommodate the phase, but the coupler is shortened as much as possible. By achieving this, the consumption of iron materials and grout used in couplers can be reduced, so not only can phase-absorbing couplers be used even in cases where phase absorption is not required, but even in such cases, the amount of grout used can be controlled. We provide threaded reinforcing bar joint mechanisms and their usage, as well as reinforcing bars and couplers.

In the invention of Patent Document 4, grout is injected into the opening adjustment part and the outer periphery of the joint end using knots with acute angle apexes and threaded joint reinforcing bars that keep the interval between the knots constant while increasing the screwing angle. A threaded reinforced bar joint with holes is provided.

JP2020-12308 Published patent No. 61-42437 JP2009-19444 Patent No. 7081062

The above invention had the following problems.

The invention of Patent Document 1 removes the knots and ribs of the deformed reinforcing bars, processes the base material, makes use of the incomplete threads, applies millimeter screws, etc. by machining, and connects them using threaded joints. The base metal reinforcing bars at both ends of each book must be cut and threaded, which increases the number of steps and costs.

In the invention of Patent Document 2, one side of the sleeve is threaded into the base material of the deformed reinforcing bar, the loose diameter of the unprocessed side is inserted, and the outer periphery of the base material is crimped by die-casting to attach the joint. Since the bolts are inserted into the female threads to connect the deformed reinforcing bars, the number of processing steps and parts required for the joint increases, which increases costs.

In the invention of Patent Document 3, the amount of grout used increases with respect to the length, which may affect joint performance as the screw thread decreases.

In the invention of Patent Document 4, although the amount of grout used is reduced, the grout is essential.

In order to solve the above problem, the invention according to claim 1 is characterized in that two joints are provided with screwing angles of 81 degrees or more, and the interval between the joints is maintained at 1.6 mm to 5.2 mm. A threaded joint socket for connecting threaded joint bolts, wherein the minimum number of threaded threads is 5, that is, the minimum number of threaded threads from both ends is 10, and the interval between the male thread nodes of the threaded bolt and the threaded joint are The nodes of the female thread of the socket are equally spaced, the node angle of the male thread of the threaded bolt is equal to the node angle of the female thread of the threaded socket, and the height of the male thread of the threaded bolt is By making the height of the threaded bottom of the threaded socket equal, the male thread of the threaded bolt and the female thread of the threaded socket are completely fitted, and grouting is not required when connecting. It is characterized by not being

The invention of claim 2 is the threaded socket joint of claim 1, which is characterized in that after the two threaded irons are connected, threaded spring washers and threaded nuts are set and tightened from both ends. .

Since the screw threads of the threaded socket are machined, productivity is improved and costs can be reduced, and since no grout is used, the socket can be reconnected in the event of a connection failure. In addition, since the threaded bolt is the material, it can be used as is without processing the base material, making it an inexpensive material, expanding the uses of the threaded bolt, and reducing manufacturing costs.

FIG. 2 is a diagram showing a threaded joint bolt (1) in which the interval (P) between the joints (9) is narrowed and the angle (A) between the joints (9) and the axis (K) is increased, according to an embodiment of the present invention. It is a diagram in which threaded bolts (1) are connected according to an embodiment of the present invention, and includes a threaded socket (2) with a minimum number of threads (b), a threaded nut (3), and a threaded spring washer. It is a diagram showing a state in which (4) is set. FIG. 2 is an enlarged view of the male thread of the threaded bolt (1) and the female thread of the threaded socket (2) according to the embodiment of the present invention. FIG. 2 is a diagram showing a state in which the male thread of the threaded bolt (1) and the female thread of the threaded socket (2) are fitted together, according to an embodiment of the present invention. It is a figure showing the cutting situation of threaded bolt (1) concerning an embodiment of the present invention. 4 shows a method of matching the phases of threaded bolts (1) according to an embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiments are illustrative for explaining the present invention, and are not intended to limit the present invention only to the embodiments. Further, the present invention can be modified in various ways without departing from the gist thereof. Furthermore, in each drawing, the same components are given the same reference numerals as much as possible, and duplicate explanations will be omitted.

In FIG. 1, i) shows a side view of the threaded bolt (1), and ii) shows a front view of the threaded bolt (1). The distance (P) according to the present invention is 1.6 mm to 5.2 mm, preferably 3.0 mm to 5.0 mm, and more preferably 4.0 mm.

The angle (A) between the node (A) and the axis (K) shown in FIG. The angle at the node (9) of the threaded bolt (1) is greater than 80 degrees, preferably 81 degrees or more, and more preferably 82 to 87 degrees.

Furthermore, in the threaded joint bolts (1) made by companies A, B, and C, the knot (9) is trapezoidal, but as shown in Fig. 1, the threaded joint bolt (1) of the present invention has an acute angle or trapezoidal apex. Alternatively, it may be curved as shown in the male thread in FIG.

Since the threaded joint bolt (1) of the present invention as described above has a narrow interval (P) between the joints (9), the adhesion of the socket is improved. Further, since the threaded bolt (1) of the present invention has a large angle (A) between the knot (9) and the axis (K), the threaded bolt (1) can be smoothly engaged and slippage is reduced. This improves the screwing strength and makes it possible to shorten the joint (2) described below.

In manufacturing the threaded bolt (1) in Figure 1, JIS G3112 Steel Bars for Reinforced Concrete specifies the standards for round steel bars and deformed steel bars manufactured by hot rolling used for concrete reinforcement.

There are two types and symbols for round steel in this standard: SR235 and SR295. Furthermore, there are five types and symbols of the deformed steel bars: SD295A, SD295B, SD345, SD390, and SD490. In recent years, products equivalent to SD590 and SD685 have been manufactured.

In order to manufacture the threaded bolt (1) in Fig. 1, according to the JIS G3112 standard for steel bars for reinforced concrete, deformed steel bars have protrusions on the surface, ribs that are protrusions in the axial direction, and protrusions in other than the axial direction. Provide a knot. The nodes (9) are distributed over the entire length at approximately constant intervals (P) and have the same shape and dimensions.

In the standards of D16 and above, the root of the joint of a deformed steel bar must be shaped to reduce stress concentration, and there are no regulations regarding changes in the shape of the joint (9).

Therefore, by setting the angle (A) as in the present invention, it becomes possible to narrow the interval (P) between the nodes (9). Since the angle (A) between the node (9) and the axis (K) is specified to be 45 degrees or more, it is within the standard even if it is 81 degrees or more.

The height (H) of the knot is within the range as the minimum and maximum values are specified for each size, and the dimensions are within the standard, so it conforms to JIS G3112 steel bars for reinforced concrete.

The threaded bolt (1) of the present invention is manufactured in accordance with the JIS G 3112 standard for steel bars for reinforced concrete. The manufacturing method is hot rolling as shown in Figure 4, which makes it possible to manufacture in large quantities.

FIG. 5 shows the cutting state of the caliber (Y) of the threaded bolt (1) on the rolling roll of the final finishing stand, and FIG. 6 shows the method of aligning the threaded bolt (1) with the phase.

The threaded bolt (1) shall be manufactured by hot rolling within the specifications, and the heated square billet will be made into an intermediate shape for each standard using multiple hot rolling stands according to the cross-sectional reduction ratio for each standard. . The smaller the standard size, the more stands there will be. The caliber shape (X) for each standard rolled in the previous process of the final stand can be rolled with the caliber (Y) of the threaded joint bolt (1) of the present invention on the final rolling stand. It becomes possible to mass produce bolts (1).

The protrusion in the direction of the axis (K) is called a rib, and the protrusion in the direction other than the direction of the axis (K) is called a node (9). A threaded bolt (1) has no rib and the node (9) is thread-shaped. In both cases, the protrusions are manufactured by the roll caliber (Y) on the final rolling stand.

The two rolls of threaded joint reinforcing bar bolts (1) for each standard in Figure 1 have a roll diameter within the applicable range of the final stand because the roll diameter for each standard is determined by the joint (9) pitch (P). The roll diameter is such that the outer circumference (W) of the roll is divisible by the pitch (P) of each standard.

After determining the roll diameter, set the roll gap (Z) between the upper roll (5) and lower roll (6), and tighten the joint (9) of the threaded bolt (1) by aligning the two rolls. Cut the bolt (1). Even if the rolls are separated, it is possible to manufacture the threaded bolt (1) by combining them.

In order to make the threaded bolt (1) into a shape with width across flats (B), a recess is made in the center of the gourd-shaped leader oval (X) that was rolled in the previous process, and it is rolled down on a final finishing stand. This prevents the recess from widening and allows the width across flats (B) to be formed.

Depending on the shape of the leader oval (X), when rolled on the final finishing stand, it is divided into round steel bars, D bars, and threaded reinforcing bars. The leader oval (X) of the threaded bolt (1) has a gourd-shaped cross section as shown in Fig. 5, and when the central depression is rolled down, a rib is formed in the gap (Z) between the rolls (9). It is designed so that it does not stick out.

As mentioned above, the threaded bolt (1) has sections cut into each of the upper and lower rolls, so it fixes the axis of the lower roll and allows the rotation of the axis of the upper roll to be changed freely. . This allows for phase alignment, so the universal joint that connects the upper roll has a built-in phase device that can rotate the axis for fine adjustment, and the phase can be matched by rotating the axis forward or backward in the rolling direction. .

As shown in Fig. 6, the test rolled product (8) was cut at right angles at both ends to a length that allowed measurement of 10 peaks, and placed on a surface plate at 10 sections on the upper roll (5) side in the rolling direction. (b1) and the dimension (b2) of the 10 sections on the lower roll (6) side. Since the lower roll (6) side is fixed, if the dimension difference (b3) is larger than the dimension on the lower roll (6) side, the joint is rotated to the rear side by the dimension of the difference (b3). If it is small, by rotating the dimension of the difference (b3) to the front side, the phases will match even if the phase difference (b0) is half a pitch.

By the above method, it is possible to mass-produce threaded bolts (1) that satisfy other standards.

The socket (2) shown in FIGS. 2 to 4 is a socket (2) for connecting the threaded bolt (1) manufactured by the above method. An example of the socket (2) will be given below, but the material, manufacturing method, and shape of the socket (2) are not limited thereto.

FIG. 2 is a cross-sectional view of a threaded bolt (1), in which a threaded socket (2), a threaded spring washer (4), and a threaded nut (3) are set. The threaded socket (2) does not have an inspection hole in order to prevent a decrease in strength due to weight reduction, and has a nut-shaped screw similar to the threaded bolt (1) on the cylindrical inner surface like a pipe joint. The unevenness of the mountain is formed.

The two threaded bolts (1) are each screwed into both ends of the threaded socket (2). The minimum number of threaded threads (b) that prevents the base material of the threaded bolt (1) from coming off is determined by the fact that the threaded bolt (1) of the present invention is made larger than 80 degrees, which increases the fitting friction, and therefore increases the strength. Based on the test and pull-out test, there are 5 peaks, that is, 10 peaks from both ends.

FIG. 3 is a diagram of the threaded bolt (1) and the threaded socket (2) before they are fitted together. Figure 3 i) shows the spacing (P) and node angle (U) of the male thread of the threaded bolt (1), and Figure 3 ii) shows the female thread of the threaded socket (2). are the interval (P) and node angle (U) of the nodes (A). By making the interval (P) and knot angle (U) of the knots (A) equal, as well as the knot height (H) and the height of the socket screw bottom (F), a screw knot that can be perfectly fitted can be obtained.

FIG. 4 is a diagram showing a threaded bolt (1) and a threaded socket (2) fitted together. As shown in FIG. 4, since they are completely fitted without any gaps, it is possible to create a threaded bolt (1) and a threaded socket (2) that do not require pressure welding or grouting.

In order to further increase the connection strength, as shown in FIG. 2, after the threaded socket (2) is fitted, a threaded spring washer (4) and a threaded nut (3) may be set and tightened. While maintaining a strong connection, it is groutless, so it can be taken apart and can be re-inspected.

1 Threaded joint bolt 2 Threaded joint socket 3 Threaded joint nut 4 Threaded joint spring/washer 5 Upper roll 6 Lower roll 7 Roll rotation direction 8 Test pressure product 9 Joint A Angle between joint and axis B Width across flats b Minimum screw thread Number b0 Minimum number of threads b1 Minimum number of threads b2 Minimum number of threads C Bolt inner diameter (top and bottom)
D Bolt outer diameter E Socket outer diameter e Cutting caliber cross section F Socket screw bottom G Socket inner diameter H Node height K Axis J Node bottom roll caliber outer circumference L Socket total length M Node top roll caliber outer circumference N Screw joint nut height P Interval (pitch) )
R Knot root R diameter r Knot root r radius S Spring/washer height T Width of the defective part of the knot U Knot angle V Rolling direction W Roll outer circumference X Leader oval cross section (gourd shape)
Y Roll caliber cutting of threaded bolt Z Roll gap

In order to solve the above problem, the invention according to claim 1 provides two screws characterized in that the screws are provided with joints whose screw-in angle is 81 degrees or more, and the interval between the joints is maintained at 1.6 mm to 5.2 mm. A threaded joint socket joint for connecting knot bolts, the number of threaded threads is 5 or more , that is, the number of threaded threads from both ends is 10 or more , and the distance between the knots of the male thread of the threaded bolt and the threaded joint are The female thread nodes of the socket joint are equally spaced, the screwing angle of the male thread node of the threaded bolt is equal to the screwing angle of the female thread of the threaded socket joint , and the male thread of the threaded bolt is By making the height of the knot of the threaded socket joint equal to the height of the threaded bottom of the threaded joint socket joint , the male threaded joint of the threaded bolt and the female threaded joint of the threaded joint socket joint are completely fitted and connected. It is characterized by the fact that it sometimes does not require grouting material.

The invention of claim 2 is the threaded joint socket joint of claim 1 , wherein after connecting the two threaded bolts , a threaded spring washer and a threaded nut are set at both ends of the threaded bolt , and the threaded joint is tightened. It is characterized by tightening socket joints .

The invention of claim 2 is the threaded socket joint of claim 1, in which after connecting the two threaded bolts, a threaded spring washer and a threaded nut are set at both ends of the threaded socket joint , and the threaded socket joint is tightened. It is characterized by tightening joint socket joints.

Claims (2)

A threaded joint socket for connecting two threaded joint bolts, characterized in that the joint has a joint whose screwing angle is 81 degrees or more, and the interval between the joints is maintained at 1.6 mm to 5.2 mm,
The minimum number of threaded threads is 5, that is, the minimum number of threaded threads from both ends is 10,
The intervals between the male threaded nodes of the threaded bolt and the female threaded nodes of the threaded socket are equally spaced;
The node angle of the male thread of the threaded bolt is equal to the node angle of the female thread of the threaded socket,
The height of the male thread of the threaded bolt and the thread bottom height of the threaded socket are made equal;
By this, the male thread of the threaded bolt and the female thread of the threaded socket are completely fitted, and no grout is required during connection.
A threaded joint socket joint characterized by: The threaded joint socket joint of claim 1,
After connecting the two screws, set the screw spring washer and screw nut from both ends and tighten.
A threaded joint socket joint characterized by: