JP2009013733A - Construction method for butting lap joint using coupler and butting lap joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a butting lap joint for reinforcements capable of reducing the overall size of reinforcements, shortening auxiliary reinforcements used in combination with the reinforcements, and easily and efficiently connecting the reinforcements in a butt state when the reinforcements are connected to each other. <P>SOLUTION: The reinforcements a, b are inserted into a coupler 2 with their ends to be connected to each other brought into a butt state. With the auxiliary reinforcements 3 inserted into the coupler 2, a tapered metal fitting 4 is press-fitted into the space inside the coupler 2 for pressing and connecting both reinforcements a, b to each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a butt-type lap joint construction method and a butt-type lap joint by using a reinforcing bar coupler used for connecting various reinforcing bars embedded in concrete.

  In the construction site of concrete structures, when connecting main bars such as columns and beams, reinforcing bars such as hoops, stirrups, etc. in a straight line in the state of butting, they are generally gas pressure welded joints, welded joints, lap joints, Mechanical joints are used.

  By the way, when connecting rebars on site, gas pressure welding joints and welded joints must carry equipment for pressure welding and welding to the work site, and special techniques are required to connect the rebars. From the viewpoint of workability and environment, the use of lap joints and mechanical joints is suitable for connecting reinforcing bars on site.

  In the former lap joint, the ends of the reinforcing bars are overlapped with each other for a predetermined length, and then the concrete is placed. After the concrete is hardened, one of the reinforcing bars is attached using the adhesion between the reinforcing bars and the concrete. It is a joint construction method in which integration is achieved by transmitting force from one to the other.

  Examples of the latter mechanical joints include threaded joints, steel pipe crimped joints, filled joints, joint joints, etc. These mechanical joints mechanically engage the deformed bar nodes and the surrounding sleeves. It is a method of joining using.

  The lap joint described above must secure a sufficient amount of overlap at both ends of the reinforcing bar, which is uneconomical due to the increased consumption of reinforcing bars, and cannot be used under conditions where the bar arrangement space is narrow. There is a problem that a step is generated in the reinforcing bar to be connected and the finish of the reinforcing bar becomes unnatural.

  In addition, other mechanical joints have the advantage that the reinforcing bars can be connected in a straight line, but in order to ensure the connecting strength of the reinforcing bars, they are inevitably enlarged in the axial direction, leading to an increase in material costs. Threaded joints and steel pipe crimped joints have the problem that connection work takes time and labor, and costs are increased.

  Therefore, the problem of the present invention is that, in the connection of reinforcing bars, the connection work can be performed efficiently and easily without being influenced by the working conditions at the site, and the use of couplers can shorten the accessory bars, It is an object of the present invention to provide a butt lap joint method and a butt lap joint by using a reinforcing bar coupler which can be easily and efficiently connected in a butt state without requiring a special technique in the field.

  In order to solve the above-described problems, the butt-type lap joint method using the coupler according to the present invention includes a coupler that inserts the ends of reinforcing bars that are connected to each other in a butt state, and a splicer that is inserted into the coupler. And a taper fitting press-fitted into the coupler, and insert the end portions of the reinforcing bars to be connected to each other into the coupler so that the end surfaces thereof are in abutted state and insert the splicing bars, and in this state the coupler A configuration is adopted in which both the reinforcing bars are pressed and connected by press-fitting a taper fitting into the inner space.

  Here, the coupler and both reinforcing bars can be fixed with a fastening screw screwed into the coupler, or a grout material can be injected into the internal gap of the coupler.

  The butt-type lap joint using the first coupler of the present invention is a coupler that inserts the ends of reinforcing bars that are connected to each other in a butted state, a splicing bar that is inserted into the coupler, and press-fits into the coupler. The coupler has a taper fitting that presses and connects both rebars, and the coupler has a space in which the inner diameter can be press-fitted with a splicing bar and a taper fitting inserted into the coupler in the same manner as the rebar with the end part inserted in a butt shape. The taper fitting is formed of a pair of wedge bodies that overlap each other with tapered surfaces.

  The butt-type lap joint using the second coupler of the present invention includes a coupler that inserts the ends of reinforcing bars having different diameters in a butted state, a supplementary bar that is inserted into the coupler, a reinforcing bar in the coupler, and a reinforcing bar. It consists of a taper fitting that presses between the two rebars to connect them together, and the coupler has a splice bar and a taper fitting inserted into the coupler in the same manner as the rebar with the inner end inserted in a butt shape. The tapered metal fitting is provided with a step portion for absorbing a step caused by a difference in the diameter of the reinforcing bar having a different diameter on the contact surface to the reinforcing bar. The structure formed of a wedge body and a second wedge body that is press-fitted between the first wedge body and the accessory muscle is employed.

  The butt-type lap joint using the third coupler of the present invention includes a coupler that inserts the ends of rebars having different diameters in a butted state, a splicer that is inserted into the coupler, and a different-diameter rebar within the coupler. It consists of a taper fitting that press-fits between the rebars to connect both rebars, and the coupler has an inner diameter that is the same as that of the rebar with the end inserted in a butt-like manner. A base member that is formed in a size that can secure a space in which a taper fitting can be press-fitted, and the taper fitting has a taper surface that is oppositely inclined to both sides on the opposite side to the overlapping surface to the accessory bar, and a taper on both sides of the base member. The structure formed by a pair of wedge bodies press-fitted between the surface and the reinforcing bar is adopted.

  Here, the strength of the butt-type lap joint is such that the formula of coupler + accessory bar + concrete> main bar strength is established.

  According to the present invention, since the connection of the reinforcing bars is made by press-fitting the coupler and the taper fitting, the connection work of the reinforcing bars can be performed efficiently and easily on the site, and the taper fitting is attached along the reinforcing bars to both the reinforcing bars. Since both rebars are pressed and connected by press fitting, no special technology is required for the connection, and the efficiency of the connecting work can be improved by a single operation, against axial compression and tension, and loads from the surroundings. Thus, an excellent connection in strength can be obtained.

  In addition, the joint strength is improved by using the splicing bar, the overall structure of the joint can be reduced in size, the splicing bar can be shortened and the diameter can be reduced, and the overall length of the butt-type lap joint can be shortened. Improvement and reduction of material cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show a butt-type lap joint 1 using a coupler according to the first embodiment, and a coupler 2 for inserting the ends of reinforcing bars (main bars) a and b which are connected to each other in a butted state. The splicer 3 is inserted into the coupler 2 and the wedge-shaped taper 4 is pressed into the coupler 2 to press and connect the reinforcing bars a and b.

  The coupler 2 is made of a metal material, and is formed in a cylindrical shape having a hemispherical upper portion and a rectangular or hemispherical lower portion, and an inner diameter of the reinforcing bars a and b inserted into the upper portion with butted ends. The splicer 3 is inserted into the coupler 2 in a state where it overlaps a and b, and the taper bracket 4 is formed in a size that can secure a space in which the taper bracket 4 can be press-fitted between the splicer 3 and the lower portion of the coupler 2. Is formed of a pair of wedge bodies 4a and 4b that overlap the tapered surfaces.

  The above-mentioned reinforcing bars a and b are deformed reinforcing bars whose names are D10 to D51 (diameter unit mm), and are main bars such as columns and beams of concrete structures, hoop bars, stirrup bars, etc., and the coupler 2 has the same diameter. The inner diameter corresponding to both the reinforcing bars a and b, and the width along the length direction may be set according to the diameter of the main reinforcing bar, but is set to 100 mm, for example.

  Like the reinforcing bars a and b, the splicing bar 3 uses a deformed reinforcing bar that can increase the adhesion to concrete, or a steel bar that is not bound by JIS standards, and its length and diameter require the best concrete adhesion performance. For example, if a deformed reinforcing bar or steel bar having the same diameter as the reinforcing bars a and b is used, the length may be about 20 db or less of the main reinforcing bar or about 20 db because the sufficient strength can be obtained. As a result, the accessory bar 3 can be shortened as much as possible, and the end of the accessory bar 3 may be simply cut, but by increasing the diameter or bending it, the binding force with the concrete is increased, and the accessory bar 3 You may make it aim at further shortening.

  In order to connect the rebars a and b using the butt-type lap joint 1 of the first embodiment described above, the ends of the rebars a and b having the same diameter, which are connected to each other, are inserted into the coupler 2. The end portions are butted at the upper center position in the coupler 2, and then the splicing bar 3 is inserted into the coupler 2 and overlapped with the reinforcing bars a and b, and in this state, a pair of wedge bodies 4 a that are the taper fittings 4 a. 4b is inserted between the splicing bar 3 and the lower part of the coupler 2 so that the tapered surfaces thereof overlap, and the wedge bodies 4a and 4b are pushed into the coupler 2 by a hydraulic ram cylinder. The splicing bar 3 and the rebars a and b are tightened by the action of the taper surface, and both the rebars a and b in the butted state are connected in a straight line state that is excellent in strength against axial compression and tensile load. Can do.

  When the rebars a and b are connected, a hole is provided at the center of the coupler 2 so that the ends of the rebars a and b can be confirmed so that the rebars a and b are abutted at the center in the coupler 2. It is only necessary to mark the ends of the reinforcing bars a and b so as to achieve the equivalent insertion of the double reinforcing bars a and b.

  In order to facilitate the insertion of the supplementary bar 3 into the coupler 2, both ends of the supplementary bar 3 can be attached to the reinforcing bars a and b with C-shaped clips 5 formed of a wire rod. After connecting, the coupler 2 and both rebars a and b are fixed with a tightening screw 6 screwed into the screw hole of the coupler 2, or a grout of epoxy resin or the like is inserted in the internal gap of the coupler 2 as shown in FIG. Material 7 can be injected.

  Further, when the rebars a and b are pressed by the taper fitting 4, if the one wedge body 4a overlaid on the accessory bar 3 is fixed and the other wedge body 4b is press-fitted, the accessory bar 3 is scratched. There is an advantage that there is nothing.

  In the illustrated case, the taper metal fitting 4 is press-fitted between the reinforcing bar 3 and the lower part in the coupler 2, but may be press-fitted between the reinforcing bars a and b and the auxiliary bar 3.

  Next, FIGS. 3A and 3B show a butt-type lap joint 1a according to a second embodiment in which the reinforcing bars a and b having different diameters are butt-connected, and the reinforcing bars a and b which are connected to each other. A coupler 2 which is inserted in a state where the ends thereof are butted, a splicing bar 3 which is inserted into the coupler 2, and a taper 4 metal fitting which presses and connects the reinforcing bars a and b by being press-fitted into the coupler 2. It consists of

  The coupler 2 is made of a metal material and is formed into a hemispherical cylindrical shape. The inner diameter of the coupler 2 is inserted in the upper part with the end part butted in the same manner, and is inserted in the lower part of the coupler 2. The splicing bar 3 is formed in a size that can secure a space in which the taper metal fitting 4 can be press-fitted between the reinforcing bars a and b and the splicing bar 3.

  The taper metal fitting 4 is formed by a pair of wedge bodies 4a and 4b that overlap the taper surfaces, and the wedge body 4a that overlaps the reinforcing bars a and b is formed on the upper surface that overlaps the reinforcing bars a and b and has a diameter of the reinforcing bars a and b. A step 8 is provided for absorbing water.

  In order to connect the reinforcing bars a and b using the butt-type lap joint 1a of the second embodiment, the ends of the reinforcing bars a and b having different diameters which are connected to each other are inserted into the upper part of the coupler 2, The end portion is made to abut at the center of the upper portion in the coupler 2, and then the splicing bar 3 is inserted into the lower portion in the coupler 2, and in this state, one wedge body 4 a of the taper fitting 4 is provided with the step 8. The surface is overlapped with the reinforcing bars a and b, and the step 8 is inserted so as to absorb the difference in the diameters of the reinforcing bars a and b. Then, the other wedge body 4b is inserted between the wedge body 4a and the accessory bar 3. When this is pushed in by the ram cylinder, the splicing bar 3 and the reinforcing bars a and b are tightened outward by the action of the tapered surfaces of the wedge bodies 4a and 4b, and both the reinforcing bars a and b in the butt state are compressed in the axial direction. In addition, it can be connected in a straight line with excellent strength against tensile loads.

  Although not shown when connecting the reinforcing bars a and b, the coupler 2 and both reinforcing bars a and b are fixed with a fastening screw screwed into the coupler 2, or a grout material such as an epoxy resin in the internal gap of the coupler. Can be injected.

  Further, when the reinforcing bars a and b are pressed by the taper fitting 4, the one wedge body 4a overlaid on the reinforcing bars a and b is fixedly arranged, and the other wedge body 4b is press-fitted, so that the reinforcing bars a and b are pressed. There is an advantage of not scratching.

  FIG. 4 shows a butt-type lap joint 1b according to the third embodiment for connecting butt a and b having different diameters, and a coupler for inserting the ends of the reinforcing bars a and b which are connected to each other in a butt state. 2, a supplementary bar 3 inserted into the coupler 2, and a taper fitting 4 that press-fits the two reinforcing bars a and b by press-fitting into the coupler 2.

  The coupler 2 is made of a metal material and is formed into a hemispherical cylindrical shape. The inner diameter of the coupler 2 is inserted in the upper part with the end part butted in the same manner, and is inserted in the lower part of the coupler 2. The splicing bar 3 is formed in a size that can secure a space in which the taper metal fitting 4 can be press-fitted between the reinforcing bars a and b and the splicing bar 3.

    The taper metal fitting 4 is press-fitted between a base member 9 having a taper surface inclined in the opposite direction on both sides on the opposite side to the surface overlapping the supplementary bar 3, and between the both side taper surfaces of the base member 9 and the reinforcing bars a and b. It is formed by a pair of wedge bodies 4a and 4b.

  In order to connect the rebars a and b using the butt-type lap joint 1b of the third embodiment, the end portions of the rebars a and b having different diameters which are connected to each other are inserted into the upper part in the coupler 2, The end portion is abutted at the upper center position in the coupler 2, and then the splicing bar 3 is inserted into the lower part of the coupler 2, and in this state, the base member 9 of the taper fitting 4 has a flat bottom surface. Then, the wedge bodies 4a and 4b are respectively inserted between the tapered surfaces and the reinforcing bars a and b from both sides of the coupler 2 and are pushed by the ram cylinder, whereby the base member 9 and the both wedge bodies are inserted. 4a and 4b, the splicing bar 3 and the reinforcing bars a and b are tightened outward by the action of the tapered surfaces, and both the reinforcing bars a and b in the butt state are excellent in strength against axial compression and tensile load. It can be connected in a straight line.

  The wedge bodies 4a and 4b absorb the difference in the diameter of the reinforcing bars a and b by press-fitting from both sides, and the press-fitting amount is small for the thick reinforcing bar a and the pressing amount for the thin reinforcing bar b. By increasing the number, the difference in the diameters of the reinforcing bars a and b can be absorbed.

  At the time of connecting the reinforcing bars a and b, after connecting the reinforcing bars a and b, the coupler 2 and both reinforcing bars a and b are fixed with a tightening screw screwed into the coupler 2, or epoxy is provided in the internal gap of the coupler 2. A grout material such as resin can be injected.

  As described above, the butt-type lap joints 1, 1 a, 1 b of the respective embodiments butt both the reinforcing bars a, b inserted into the coupler 2, insert the splicing bar 3 into the coupler 2, and taper fitting 4 Since the rebars a and b are connected to each other simply by press-fitting, a special technique is not required for connecting the rebars a and b, so that the efficiency can be improved by a single operation of the reinforcing bar job and the name is D10. A wide range of rebars a to b up to D51 can be connected.

  Moreover, since the firm connection is obtained by the butt connection of both the reinforcing bars a and b by press fitting of the taper metal fitting 4, the length of the accessory bar 3 to be used can be shortened, which is economical.

(A) is a partially cutaway front view of the connection state showing the first embodiment of the butt-type lap joint, and (b) is a longitudinal side view taken along arrow bb in (a). Exploded perspective view showing the first embodiment of the butt-type lap joint (A) is the exploded perspective view which shows 2nd Embodiment of a butt-type lap joint, (b) is a longitudinal front view which shows the connection state (A) is the exploded perspective view which shows 3rd Embodiment of a butt-type lap joint, (b) is a longitudinal front view which shows the connection state

Explanation of symbols

1 Butt-type lap joint 1a Butt-type lap joint 1c Butt-type lap joint 2 Coupler 3 Saddle (lap)
4 Tapered metal fitting 4a Wedge body 4b Wedge body 5 C-shaped clip 6 Clamping screw 7 Grout material 8 Step 9 Base member a Reinforcement b Reinforcing bar

Claims (6)

  A coupler that inserts the ends of the reinforcing bars that are to be connected to each other in a butted state, a splicer that is inserted into the coupler, and a taper fitting that is press-fitted into the coupler, and is connected to each other in the coupler. By using a coupler that inserts the end of the rebar so that its end face is in abutted state and inserts a spliced bar, and presses the taper fitting into the space in the coupler in this state to press and connect both rebars Butt lap joint construction method.   The butt-type lap joint construction method using a coupler according to claim 1, wherein the coupler and both reinforcing bars are fixed with a fastening screw screwed into the coupler.   3. A butt lap joint construction method using a coupler according to claim 1 or 2, wherein a grout material is injected into an internal gap of the coupler.   A coupler that inserts the ends of the reinforcing bars that are connected to each other in a butted state, a splicing bar that is inserted into the coupler, and a taper fitting that presses and connects both the reinforcing bars by press-fitting into the coupler. The coupler is formed such that the inner diameter of the coupler is large enough to secure a space in which the splicing bar and the taper fitting inserted into the coupler can be press-fitted in the same manner as the reinforcing bar with the end portion inserted in a butt shape. A butt lap joint using a coupler formed of a pair of wedges whose surfaces overlap each other.   A coupler that inserts the ends of rebars with different diameters in a butted state, a splice inserted into the coupler, and press-fitting between the rebar and the splice in the coupler to press and connect both rebars The coupler has a taper fitting, and the inner diameter of the coupler is formed to be large enough to secure a space for press-fitting the splicing bar and the taper fitting inserted into the coupler in the same manner as the rebar with the end portion inserted in a butt shape. A metal fitting is provided with a first wedge body provided with a step portion for absorbing a level difference caused by a difference in diameter of the reinforcing bar having a different diameter on a contact surface to the reinforcing bar, and between the first wedge body and the accessory bar. Butt-type lap joint using a coupler formed by a second wedge body that is press-fitted into the body.   A coupler that inserts the ends of rebars with different diameters in a butted state, a splice inserted into the coupler, and press-fitting between the different diameter rebar and the splice in the coupler to clamp both rebars It consists of a taper fitting to be connected, and the coupler has an inner diameter formed in a size that can secure a space in which a splicing bar and a taper fitting inserted into the coupler can be press-fitted in the same manner as a rebar with the end portion inserted in a butt shape, The taper fitting is formed of a base member having a taper surface reversely inclined to both sides on the opposite side to the overlapping surface to the accessory bar, and a pair of wedge bodies press-fitted between the both side taper surface of the base member and the reinforcing bar. Butt-type lap joint by using coupler.

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