WO1999035354A1

WO1999035354A1 - Coupling metal of odd-shaped bar steels

Info

Publication number: WO1999035354A1
Application number: PCT/JP1998/000063
Authority: WO
Inventors: Yasuhiro Ozawa
Original assignee: Yugenkaisya Ozawa Tokusyugiken
Priority date: 1998-01-09
Filing date: 1998-01-09
Publication date: 1999-07-15
Also published as: AU5342998A

Abstract

A coupling metal for odd-shaped bar steels having an excellent bending strength, high tensile strength and high compression strength, capable of being applied to positions where dense arrangement of bars is necessary, insuring a smooth flow of concrete between the bars, and capable of being used in a place where a sufficient work space cannot be secured. The coupling metal comprises a connecting cylinder which is a cylindrical body comprising at least two longitudinally slit members and having at least each end side serving as a bar clamping portion for clamping an odd-shaped bar to be coupled, an outer cylinder comprising a main body portion formed by bending a sheet material into a sleeve shape and a pair of flange portions so formed as to face each other at both edges of the main body portion, the flanges having a plurality of bolt insertion holes, and fitted or inserted to the connecting cylinder from outside, and fastening bolts for fastening both flanges when fitted into the bolt insertion holes of the flanges, wherein grooves into which protuberances of the odd-shaped bar steel fit are formed in the inner surface of each bar steel clamping portion of the connecting cylinder.

Description

Akira Itoda Joints for deformed steel bars

Technical field

The present invention relates to a joint for joining deformed steel bars. Background description

Since deformed steel bars, which are widely used as reinforcing bars, are generally made of high-strength steel and cannot be welded by normal welding, the ends of both steel bars must be joined by gas heating, etc. They are sufficiently heated and pressure-welded at both ends with hydraulic jacks.

However, this pressure welding work requires skill and the working environment is severe, so it has recently become difficult to secure the necessary personnel for this work. Another drawback is that this type of work is easily affected by the weather (it cannot be performed outdoors under rainy weather or strong winds). The fact is that the rise of birds is increasing.

Also, in the pressure welding method, each end of the steel bar is shrunk by about 10 mm due to pressure welding, so it cannot be applied to the joint between constrained steel bars. Therefore, if the deformed reinforcing bar inside the beam is erroneously cut during the renovation of a building, etc., the reinforcing bar cut by the pressure welding method cannot be reconnected, and there is no other applicable bonding method. Therefore, in reality, it was necessary to leave it as it was.

As described above, in the pressure welding method, the ends of the steel bars are 10 mm each. Because of the degree of shrinkage, so-called ribs cannot be arranged unless the main bars of deformed steel bars are press-welded when arranging the bars, and the workability is poor.

In order to solve such a problem on joining of deformed steel bars, Japanese Utility Model Publication No. 6-363639 proposes a metal fitting for deformed steel bars as shown in FIG. The metal fittings are composed of two or more vertically-divided divided bodies 13a, 13b in which grooves 15 and 15 'are formed, into which projections 9 and 9' of deformed steel bars are fitted. And a holding cylinder 12A, 12B fitted externally to both ends of the coupling cylinder 11. In this joining metal fitting, the ends of both deformed steel bars X to be joined are sandwiched between both ends of the divided parts 13a, 13b constituting the connecting cylinder 11, and then the holding cylinder 1 2 A, 1 2B is externally fitted to both ends of the connecting cylinder 11 so that the inner flange portion 14 thereof comes into contact with the end face of the connecting cylinder 11, thereby connecting the connecting cylinder 1. 1 is constrained on the outside, thereby joining the ends of the deformed steel bars X to each other.

According to such joints, it is possible to easily perform the work of joining deformed steel bars without using the conventional pressure welding, and to easily join the deformed steel bars that have already been installed. There are advantages that can be done.

However, according to the study by the present inventors, it has been found that this joint has the following problems.

(1) A structure in which the strength against bending is obtained only by the connecting cylinder 11, and the connecting cylinder 11 is simply a stack of two or more vertically-divided divided parts 12. Therefore, the strength against bending is not sufficient. In addition, there is a problem that sufficient strength cannot be obtained with respect to bending acting in a direction perpendicular to the division surface of the connecting cylinder 11.

(2) Since the connecting cylinder 11 consisting of two or more vertically-divided divided bodies is restrained by the holding cylinders 12A and 12B fitted to the both ends, it is integrated, In order to secure this restraining force sufficiently, it is necessary to press the holding cylinders 12A and 12B against the connecting cylinder 11 with a strong force so that the outer cylinders are tightly fitted. This is because if such a mating state is not properly obtained, the bar steel will rattle inside the connecting cylinder 11 and the integrity of the bar and the connecting cylinder will be lost. This is because the stress that occurs is not transmitted well to the joints, making them virtually unusable as joints. However, on-site work in which the holding cylinders 12A and 12B must be pushed into the connecting cylinder 11 with strong force is inefficient, and the joining fittings themselves require high dimensional accuracy. Therefore, the cost must be high.

In addition, in the steel bar joining during the rebar arrangement work, when the presser cylinders 12A and 12B are pushed into the connecting cylinder 11, the presser cylinders 12A and 12B are inserted due to the work space and other problems. In some cases, a strong force (push-in force) cannot be applied, and in such a place, the joint bracket cannot be used effectively.

(3) The connecting cylinder 11 is restrained and integrated with the holding cylinders 12A and 12B fitted to both ends of the connecting cylinder. Therefore, the holding cylinders 12A and 12B are thick and rigid. Must be high. For this reason, the joint of deformed steel bars using the above-mentioned joints has a shape in which both ends are extremely bulged by the holding cylinders 12A and 12B. However, the reinforcing bars used in the construction of buildings, etc., need to be arranged very tightly in some places. (For example, the foundation of a building) is stiff. Even if the above-mentioned joints are applied to join the reinforcing bars at such a point, the holding cylinders 12 A and 12 B bulge out. In some cases, there is not enough space for the part to be used, and it cannot be used practically.

筒 Due to the presser cylinders 12A and 12B, the space between adjacent joints is narrower due to the bulging ends, so that the concrete can be passed between the reinforcing bars. Is inferior. In particular, as described in (1) above, in places where tight reinforcement is required, the space for the swelling part by the presser cylinders 12A and 12B could be secured, and the joint metal could be used. Even so, the gap between adjacent joints becomes extremely narrow, which may lead to insufficient refilling of concrete between reinforcing bars and structural defects.

⑤ Each of the presser cylinders 12 A and 12 B has a flange section 14, and the presser cylinders 12 A and 12 B are connected to the inner flange section 14. This is a structure in which the outer surface of the connecting cylinder 11 is restrained by being fitted to both ends of the connecting cylinder 11 so as to be in contact with the end face of the connecting cylinder 11. For this reason, when joining deformed steel bars, presser cylinders 12A and 12B are extrapolated in advance to each of the deformed steel bars to be joined, and a connecting cylinder is inserted between the deformed steel bars. After attaching 1 1, move the presser cylinder 1 2 A and the presser cylinder 1 2 B externally inserted into both deformed steel bars in the direction of the connecting cylinder 11, respectively, and attach them to each end of the connecting cylinder 11. It is necessary to fit outside. However, when joining deformed steel bars that are already bound (constructed), sufficient space cannot be secured depending on the actual construction location. (Or 1 2 B) extrapolated In some cases, the use of metal fittings is virtually impossible.

押 Workability is poor because it is necessary to attach the holding cylinders 12 A and 12 B to both ends of the connecting cylinder 11, respectively, and also join deformed steel bars that have already been restrained (constructed). In such a case, depending on the construction site, there is a case where the working space on either side of the deformed steel bar cannot be sufficiently secured, and the use of the joint bracket is practically impossible.

Therefore, an object of the present invention is to provide a joint which can solve all of the problems of the conventional joint. Disclosure of the invention

In order to achieve such an object, the joint of the present invention has the following features.

[1] A cylindrical body composed of two or more vertically-divided divided bodies (2), at least each end of which has a bar insertion portion (10) for inserting a deformed steel bar to be joined. ) And a connecting cylinder (1),

A main body (30) obtained by bending a plate material into a sleeve shape, and a pair of flanges (3 la) and (31 b) formed on both ends of the main body (30) so as to face each other. Further, a plurality of bolt holes (7) are formed in the both flange portions (31a) and (31b), and the outer cylindrical body is fitted or inserted into the connecting cylindrical body (1). (3) and

A plurality of tightening bolts (6) for fastening the flanges (31a) and (31b) by being attached to the bolt insertion holes (7) of the flanges (31a) and (31b). ) Grooves (4), (4 ') into which projections of a deformed bar are fitted are formed on the inner surface of each bar-steel insertion portion (10) of the connecting cylinder (1). Metal fittings.

[2] In the joint fitting of the above [1], the connecting cylinder (1) is made of steel having a tensile strength equal to or higher than that of the deformed bar to be joined, and A joint for deformed steel bars, wherein a total radial cross-sectional area of the body (1) is equal to or larger than a radial cross-sectional area of the deformed steel bars.

[3] The joining metal fitting of the above-mentioned [1], wherein the connecting cylinder (1) is composed of two divided parts (2).

[4] The joining metal fitting of the deformed steel bar according to the above [1], wherein substantially the entire length in the longitudinal direction of the connecting cylinder is the steel bar inserting portion (10).

[5] In the joint fitting of the above [1], the tightening bolts (6) attached to the flanges (31a) and (31b) are connected to the main body (30) of the outer cylinder (3). A deformed steel bar joining fitting characterized by being elastically deformed and constraining a connecting cylinder (1) to an outer cylinder (3).

[6] In the joint fitting of the above [1], the connecting cylinder (1) is composed of two divided parts (2), and the substantially entire length in the longitudinal direction of the connecting cylinder is a rod pot insertion portion (10). ), The fastening bolts (6) attached to the flanges (31a) and (31b) elastically deform the body (30) of the outer cylinder (3), A joining rod for deformed steel bars, wherein the connecting cylinder (1) is restrained by the section (3).

[7] In the joint fitting of the above [6], the connecting cylinder (1) is made of steel having a tensile strength equal to or higher than that of the deformed steel bar to be joined, and 1) The total cross-sectional area in the radial direction is A metal fitting for a deformed steel bar having a sectional area or more.

According to such a deformed steel bar joint of the present invention, the following effects can be obtained.

① Even when a tensile force is applied to the deformed steel bar X, the outer cylindrical body 3 in which the flanges 31a and 31b are tightened with the tightening bolts 6 firmly restrains substantially the entire length of the connecting cylindrical body 1, and the divided body is divided. Applied to reinforcing materials and other joining applications to hold the deformed steel bar X and connecting cylinder 1 firmly together without rattling, holding down 2a and 2b from spreading outward. In this case, high strength can be obtained against the tensile and compression of the bar.

(2) Since the outer cylinder 3 is externally fitted or inserted into the entirety of the coupling cylinder 1 and restrains it, it is sufficient for bending acting at right angles to the division surface of the coupling cylinder 1. High strength is obtained.

(3) It is not necessary to push the outer cylinder (3) into the connecting cylinder (1) with a strong force, so workability at the site is good, and for the same reason, high dimensional accuracy is not required for the joint fitting. It can be manufactured at low cost.

④ It is not necessary to make the thickness of the outer cylinder 3 excessively large, and since it is not a shape that swells at both ends like a conventional joint bracket, it can be used even in places where tight reinforcement is required. Applicable enough.

⑤ Also, for the same reason, even if the reinforcement is applied to a densely arranged area, the concrete can be easily passed between the reinforcing bars, which may cause a defect in the concrete re-entry. There is no.

状態 Since the outer cylinder 3 is a single member, does not have an inner flange like a conventional fitting, and has an almost straight inner surface, The outer cylinder 3 can be extrapolated to either of the deformed steel bars, and therefore the outer cylinder 3 cannot be extrapolated to only one of the deformed steel bars because sufficient space cannot be secured. In such a construction site, or in a construction site where the working space on one of the deformed bars is not sufficient, it is possible to use the joint bracket.

構造 Compared to conventional joints, the structure is simpler and easier to manufacture, and the number of parts can be reduced, so that the joints can be reduced in cost. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows an example of an embodiment of the present invention, and is a plan view of a state where steel bars are joined.

FIG. 2 is a cross-sectional view taken along line Π— 中 in FIG.

FIG. 3 is a longitudinal sectional view along the in-m line in FIG.

FIG. 4 is a perspective view of one of the divided portions constituting the connecting cylinder shown in FIG.

FIG. 5 is a perspective view showing an example of a deformed steel bar.

FIG. 6 is a longitudinal sectional view showing the structure of a conventional joining fitting. BEST MODE FOR CARRYING OUT THE INVENTION

1 to 4 show an example of the embodiment of the present invention. FIG. 1 is a plan view showing a state in which steel bars are joined, FIG. 2 is a cross-sectional view taken along line 図 —Π in FIG. 1, and FIG. 1 out of III] is a cross-sectional view along the Π line, and FIG. 4 is a perspective view of one of the divided portions constituting the connecting cylinder.

The joint fitting of the present invention is composed of a pair of vertically divided split parts 2a and 2b. And an outer cylinder 3 externally fitted or inserted into the coupling cylinder 1.

The connecting cylinder 1 is formed in a tubular shape in a state where the divided parts 2 a and 2 b constituting the connecting cylinder 1 are combined, and at least the inside of each end thereof (in the present embodiment, the connecting cylinder 1 The inside of the entire length) is a bar insertion portion 10 for inserting the deformed bar to be joined. A groove 4 into which a circumferential projection 9 of the deformed steel bar is fitted is formed in the inner circumferential direction of the steel bar sandwiching portion 10. A notch 5 is formed on the inner edge of each of the divided parts 2a and 2b along the longitudinal direction to fit a protrusion 9 'along the longitudinal direction on both sides of the deformed steel bar. That is, the notch 5 constitutes a groove 4 ′ as shown in FIG. 2 in a state where the divided portions 2 a and 2 b are overlapped in a cylindrical shape.

The inner diameter of the connecting cylinder 1 in the direction between the two divided parts 2a and 2b when the divided parts 2a and 2b are simply overlapped without inserting the deformed steel bar is the deformed steel bar to be joined. Is configured to be the same as or slightly smaller than the outer diameter of. This can prevent rattling when the deformed bar is inserted and tightened. The dimensional accuracy of the deformed bar is not so high, and in addition, the circumferential protrusion 9 of the deformed bar is displaced in the longitudinal direction from the axial protrusion 9 'as shown in Fig. 5. However, since the distance between the protrusions 9 adjacent in the longitudinal direction of the steel bar is substantially equal, it is preferable that the width of the groove 4 of the connecting cylinder 1 be substantially the same as the width of the protrusion 9 of the steel bar.

In addition, since the connecting cylinder 1 is a member that receives a tensile force applied to the deformed steel bar X, it is preferable that the connecting cylindrical body 1 be formed of steel having a tensile strength equal to or higher than that of the deformed steel bar X. The reason is that the total radial cross-sectional area of the connecting cylinder 1 is preferably larger than that of the deformed steel bar X. Good.

The outer cylinder 3 includes a main body 30 formed by bending a plate material into a sleeve shape, and a pair of flanges 31 a and 31 b formed on both end edges of the main body 30 so as to face each other. And has a length such that it can be externally fitted or inserted over at least substantially the entire length of the connecting cylinder 1. The outer cylindrical body 3 has a substantially flat plate-shaped surface, and does not have an inner flange portion unlike a conventional fitting. A plurality of bolt insertion holes 7 are formed in the flanges 31a and 31b. Tightening bolts 6 are attached to these bolt holes 7 and the divided parts 2a and 2b in which deformed steel bars are inserted. Tighten the connecting cylinder 1 consisting of

The outer cylinder 3 is formed by tightening the flanges 31a and 31b with the tightening port 6 so that the flanges 31a and 31b are separated when the tightening bolt 6 is not attached. The main body 30 of the outer cylindrical body 3 is elastically deformed to restrain the connecting cylindrical body 1. Therefore, the inner diameter of the main body 30 when the flanges 31 a and 31 b are overlapped by elastically deforming the main body 30 in a state in which the main body 30 is not fitted to or externally inserted into the connecting cylinder 1. Alternatively, the inner peripheral length must be smaller than the outer diameter or the outer peripheral length of the connecting cylinder 1 with the deformed bar inserted.

Further, in order to increase the contact area with the concrete cast around the outer cylindrical body 3, the outer surface can be provided with an uneven surface or a large number of protrusions on the outer surface. For example, if the outer cylinder is formed using a so-called striped steel plate, the outer cylinder 3 having such an outer surface structure can be obtained.

The connecting cylinder 1 may be composed of three or more vertically-divided divided parts. In addition, the connecting cylinder 1 and the outer cylinder 3 are not limited to cylindrical shapes, and may be appropriately cut. It can have a planar shape. In addition, the outer cylinder 3 only needs to have a length that can be fitted or extrapolated over at least substantially the entire length of the connecting cylinder 1, and therefore, the connecting length of the outer cylinder 3 is increased. There is no problem if it is slightly shorter.

According to the above-described joining metal fittings, the ends of the deformed steel bars X to be joined are opposed to each other at an appropriate interval, and the both ends are joined by a pair of divided parts 2 constituting the connecting cylinder 1. a and 2b are inserted at the bar insertion portion 10. At this time, the protrusions 9 and 9 ′ of the steel bar are fitted into the grooves 4 and 4 ′ of the steel bar insertion portion 10. With the end portion of the steel bar sandwiched in this way, the outer cylinder 3 previously extrapolated to one of the deformed steel bars X is moved so as to be externally fitted or inserted into the connecting cylinder 1. Then, tighten the bolts 6 (bolts' nuts) in the bolt insertion holes 7 of the flanges 3 1 a and 3 lb, and use the tightening bolts 6 to secure both flanges 3 1 a and 3 1 b. The rejoining is completed by firmly tightening.

In the joint fitting of the present invention, the projections 9, 9 of the deformed steel bar are fitted into the grooves 4, 4 'of the steel bar insertion portion, and the outer cylinder 3 is externally fitted or externally fitted to the connecting cylinder 1. As long as it is inserted, for example, even if the split part 2a and the split part 2b are constrained in a state where the bar 9 It does not matter if bodies 2a and 2b do not come into complete contact.

In the joint using such joints, even when a tensile force is applied to the deformed steel bar X, the outer cylindrical body 3 in which the flanges 3 la and 31 b are tightened with the tightening bolts 6 is substantially equivalent to the connecting cylindrical body 1. The entire length is firmly restrained, and the divided sections 2a and 2b are prevented from spreading outward, and the deformed steel bar X and connecting cylinder 1 are connected. Strongly integrated without rattling. For this reason, the bar

The protrusions 9, 9 of the steel bar fitted in the grooves 4, 4 ′ of 10 do not come off the grooves, and therefore, the deformed steel bar X does not come off from the connecting cylinder 1. For this reason, by making the material and cross-sectional area of the connecting cylinder 1 approximately the same as or larger than that of the deformed steel bar X, it is high in tensile strength when applied to reinforcing bars and other joining applications. Strength is obtained. In addition, the strength against bending can be obtained only by the outer cylinder 3 and the connecting cylinder 1 constrained by the outer cylinder 3, and therefore, the outer cylinder 1 can be sufficiently bent without bending the outer cylinder 1 excessively thick. Strength is obtained.

Furthermore, since it is not necessary to push the outer cylinder 3 against the connecting cylinder 1 with a strong force, workability at the site is good, and in addition, it is necessary to make the outer cylinder 3 excessively thick. It does not have a bulged shape at both ends unlike conventional joints, so it can be applied to places where tight reinforcement is required. The run-around of the REIT is also good.

In addition, since the outer cylinder body 3 does not have an inner flange portion as in the case of the conventional joining metal fittings, and has an almost straight inner surface, the outer cylindrical body 3 can be attached to either side of the two deformed steel bars X to be joined. The outer cylinder 3 can be extrapolated.

Although the joint fitting of the present invention is suitable for joining deformed reinforcing bars serving as reinforcing members, it is also necessary to use deformed steel bars as tie rods in dam construction and harbor construction. It can be used for all joining applications of deformed steel bars, such as joints of various types. Industrial applicability INDUSTRIAL APPLICABILITY The joint fitting of the present invention can be widely used for construction work of various buildings and structures, civil engineering work, etc. for joining deformed reinforcing bars serving as a reinforcing material, and deformed steel bars are used in dam construction, harbor construction, etc. It can be used as a joining tool when used as a tie rod, and can be used for all joining purposes of deformed steel bars.

Claims

The scope of the requiem

1. A cylindrical body consisting of two or more vertically-divided divided parts (2), at least each end of which has a steel bar insertion part (10) for inserting the deformed steel bar to be joined. Connecting cylinder (1),

A main body (30) obtained by bending a plate material into a sleeve shape and a pair of flanges (3 la) and (31 b) formed on both end edges of the main body (30) so as to face each other. In addition, a plurality of bolt holes (7) are formed in the both flange portions (31a) and (31b), and the outer cylinder ( 3) and

A plurality of tightening ports (6) for fastening the flanges (31a) and (31b) by being attached to the bolt insertion holes (7) of the flanges (31a) and (31b). )

Grooves (4), (4 ') into which projections of the deformed steel bar are fitted are formed on the inner surface of each bar steel insertion portion (10) of the connecting cylinder (1). Metal fittings.

2. The connecting cylinder (1) is composed of steel having the same or higher tensile strength as the deformed steel bar to be joined, and the connecting cylinder (1) has a total radial cross-sectional area. The joint of the deformed steel bar according to claim 1, wherein a diameter of the deformed steel bar is equal to or greater than a cross-sectional area of the deformed steel bar.

3. The joint according to claim 1, wherein the connecting cylinder (1) is composed of two divided parts (2).

4. The joint according to claim 1, wherein a substantially entire length of the connecting cylinder in the longitudinal direction is a bar insertion portion (10).

5. The tightening bolts (6) attached to the flanges (3 la) and (3 1 b) deform the main body (30) of the outer cylinder (3) in a unidirectional manner, and attach it to the outer cylinder (3). The welding tool according to claim 1, wherein the connecting cylinder (1) is restrained.

6. The connecting cylinder (1) is composed of two divided parts (2), and the entire length in the longitudinal direction of the connecting cylinder is a bar insertion portion (10). The tightening port (6) attached to a) and (3 1 b) elastically deforms the main body (30) of the outer cylinder (3), and connects the connecting cylinder (1) to the outer cylinder (3). The metal fitting for deformed steel bars according to claim 1, wherein the metal fittings are restrained.

7. The connecting cylinder (1) is made of steel having a tensile strength equal to or greater than that of the deformed steel bar to be joined, and the total cross-sectional area in the radial direction of the connecting cylinder (1). 7. The metal fitting for deformed steel bars according to claim 6, wherein the diameter is equal to or larger than the radial cross-sectional area of the deformed steel bars.