KR100648378B1 - Jointing device for taking place of splicing steel bars of reinforced concrete work in construction - Google Patents

Abstract

A joining device of reinforcing bars used instead of lap splicing reinforcing bars in a reinforced concrete work in construction is provided to join arranged reinforcing bars without transposition and to use for a high-quality reinforced concrete structure with necessity for precise bar arrangement effectively and economically. A joining device of reinforcing bars used instead of lap splicing reinforcing bars in a reinforced concrete work in construction comprises: a band(2) covering up the outside of two reinforcing bars(1) arranged by lap splicing; an upper cover plate(4) and a lower cover plate put on the upper and lower concave parts where two reinforcing bars are in contact with each other to restrict reinforcing bars effectively; a high-tension bolt(7) applying tensile force on the band; and a body(6) having a connecting pin hole to fix the band on the lower part using a connecting pin(3), a hole to fix the high-tension bolt, and slider(6a) and a support(6b) to tighten with the high-tension bolt not to make the body overturned. The upper and lower cover plate have magnetism.

Description

Jointing device for taking place of splicing steel bars of reinforced concrete work in construction}

1 is a perspective view of the coupling from the top according to an embodiment of the present invention.

Figure 1a is an exploded perspective view of the parts of the body portion seen from the top according to an embodiment of the present invention.

2 is a perspective view of the coupling from the bottom according to an embodiment of the present invention.

Figure 2a is an exploded perspective view of parts of the band and the upper-lower cover plate seen from the bottom according to an embodiment of the present invention.

3 is a front view according to an embodiment of the present invention.

4 is a plan cross-sectional view according to an embodiment of the present invention.

5 is a view of the tension of the high-tension bolt generated in the embodiment of the present invention and its reaction force at the center of the connecting pin.

Figure 5a is a view of the tension of the high-strength bolt generated in the embodiment of the present invention and the reaction force in the band surface in contact with the outer peripheral surface of the rebar.

6 is a perspective view showing a structure using a plurality of high-tensile bolts according to another embodiment of the present invention.

7 is a perspective view showing a structure using one slider on one body according to another embodiment of the present invention.

8 is a cross-sectional view showing a structure using a ring-shaped band according to another embodiment of the present invention.

Brief description of the symbols in the drawings

1: rebar

2: band, 2a: band-pin hanger

3: connecting pin

4: top cover plate

5: lower cover plate

6: body, 6a: slider, 6b: shoulder

7: high tension bolt, 7b: nut

The present invention relates to a reinforcing bar joint device that can be used to reinforce the reinforcing bars and reinforcing bars when the reinforcement reinforcement work in the construction of reinforced concrete construction to increase the joint strength and reduce the length of overlapping joints. More specifically, the present invention relates to a reinforcing bar device in which two steel outer circumferential surfaces of overlapping portions are surrounded by steel bands and the steel bands are tightened with high-strength bolts so that the steel bands and reinforcing bars and the cover plates of the reinforcing bars and the upper and lower parts obtain a joint strength by friction bonding force.

Reinforced concrete structure is a structure in which reinforcing steel and concrete are combined, where reinforcing bar bears tensile force where tensile force is generated, and reinforcing bar and concrete bear compressive force where compressive force is generated.

Reinforcing bars that bear the tensile or compressive force is completed by placing a standard length of a certain length at the construction site, the joint portion of the reinforcement is inevitable.

And this joint part should be a joint method that can withstand the load (tensile or compressive) applied to the reinforced concrete structure sufficiently, and the joint method used is a conventional overlapping joint (overlapping commonly used as a representation for comparison with the present invention). Joints), pressure welding, and mechanical joints using a variety of reinforcing bar fittings.

Conventional overlapped joints are the most widely used reinforcing bars in construction sites, and the required lengths of joints are calculated by the diameter of reinforcing bars selected according to the type of load (tension or compression) acting on the finished structure and the size of the loads. This method is to reinforce the bars beyond the calculated joint length and bind them with a binding line.

The advantage of overlapping joints is that it is relatively easy to calculate the joint strength and has a lot of experience, so the performance of the joint is certain, and the reinforcement work of rebar is the easiest where the joint space is secured.

The disadvantage is that it is uneconomical for the loss of material as long as the overlapped joint length of the reinforcing bar, and the rebar is easy to be distracted due to the work load during the construction work such as concrete placing work, resulting in the failure of the finished concrete structure. In addition, due to the working conditions, the required seam length specified in the design drawing may not be secured.In this case, additional reinforcing bars will be placed adjacent to secure structural strength, but this requires not only additional input of manpower and materials, The verification of structural strength is also unclear and is a cause of poor construction.

Reinforcing bar joint method by pressing is a method of integrally forming the end by heating and pressing after connecting the end of the reinforcing bar and the reinforcing bar.

However, welding is not easy to apply because there are many problems such as long working time, excessive cost and risk of fire.

In order to solve the problems of the overlapped joints and welded joints, a mechanical reinforcing joint method for placing joints at end portions of two reinforcing bars to be joined and pressing them with a connector such as a coupler has been developed and used in various ways.

The mechanical reinforcing bar is engraved with the bar shape of the reinforcing bar to effectively restrain the reinforcing bar. However, the bar shape of the reinforcing bar is different according to the manufacturers of the reinforcing bar, and various types of knitting are required. As a mechanism for fastening the connector, a continuous rotating mechanism having a good workability, that is, an impactor, cannot be used. This is because the impactor's wrench socket cannot be inserted into the connector's fastener (bolt head or nut) while the rebar is connected. Therefore, tightening is not a continuous rotating mechanism with good work efficiency, but relies on a tightening mechanism by repetitive movement such as a spanner. Another problem is that verification of joint performance is difficult. In other words, it is difficult to easily check that the connector is fastened with an appropriate tightening torque value that ensures the joint performance. Another problem is that it is necessary to push and pull the reinforcing bars in order to fit the reinforcing bar in the connector of the mechanical joint device, which is inevitable to move the position of the reinforcing bar, and the reinforcing bar position before the joint should be in a predetermined position It is difficult to absorb construction errors and it takes a lot of work time. Rebars are regulated not only in the centerline position but also in rebar length. If it is too long, it should be cut to fit the connector. If it is too short, the rebar should be replaced or a new long connector should be manufactured.

To provide joints that can be used as auxiliary joints for reinforcing bars, i.e., to reduce the length of joints, or as a substitute for the full permissible stress of the joints.

The structural calculation method of construction works, which is well known to date, provides a joint device that can easily calculate the joint strength.

As a jointing tool for joints, it is possible to provide a joint that can use a continuous rotary tool (impacter) with good work efficiency.

Reinforcing bars that can be used to reinforce the bar directly without pushing and pulling the members or moving them up, down, left, and right (axially perpendicular) when joining reinforcing bars embedded in precast members or reinforcing bars that are reinforced at predetermined positions. To provide a device

Provides a joint device which can serve to fix the rebar member or the precast member jointed by subsequent work loads such as concrete placing after the rebar or reinforcement of the precast member is reinforced. It is.

The present invention is to reinforce the reinforcing bar in the state of overlapping joints, the two joints in the overlapping joints of the steel band wrapping the rebar at the same time, and the band to the high tension bolt as a suitable device (upper and lower cover plate and body) of the present invention After connecting, high tension bolts are tightened to frictionally reinforce reinforcing bars, bands, and rebar and upper and lower cover plates, and the reinforcing device is constructed so that the reinforcing bars are connected without pushing or pulling.

In this case, the joint strength by friction welding can be set up so that the band width is large enough to have the total allowable stress of the reinforcing steel as the base material, and the number of high tension bolts is large, or one joint or rebar having a small size with a small joint strength Floating joints at the appropriate spacing of the space to install a plurality of joints to obtain a predetermined joint strength and insufficient joint strength can be supplemented by the overlapped joint length.

The configuration of the detailed apparatus of the present invention is as follows.

Bands surrounding the outer circumferential surface of the two reinforcing bars (1) after the reinforcement of the two reinforcing bars (1) connected to each other as shown in the drawings of FIGS. ), The upper cover plate (4) and the lower cover plate (5), which are placed in the concave portion of the upper and lower parts where the two bars are facing each other, and the band are not in direct contact with the reinforcing bar, and apply high tensile bolts to the band. (7), and the connecting pin (3) and the body (6) connecting the high tension bolt and the band.

Each component is explained in more detail as follows.

The lower cover plate 5 is a component which is placed in the lower part (lower part) of the concave portions where the reinforcing bar 1 faces as shown in FIGS. 2, 2a, and 3, and the outer circumferential surface of the lower cover plate is a band (2). Is an arc-shaped cross section so as to wrap around, and the inner circumferential surface in contact with the reinforcing bar has a convex cross section that fits into the concave space where the two reinforcing bars face each other. The lower cover plate is a tension applied to the band, the inner circumferential surface compresses the reinforcing bar to obtain a friction bonding force.

The upper cover plate 4 is a component that is placed on the upper part of the concave portions facing the reinforcing bars 1 as shown in FIGS. 1, 1a and 3. Unlike the lower cover plate 5, the band 2 does not directly surround the upper cover plate. As shown in FIGS. 1a and 2a, the longitudinal center portion of the upper cover plate is dug relative to both ends so that the band can be coupled to the body 6 through a connecting pin without contacting the upper cover plate. Both ends in the longitudinal direction have a larger cross section up to the outer side of the reinforcement than the central portion, and the body and the connecting pin are placed on the outer circumferential surface (outer circumferential surface) of the cross section. The inner circumferential surface (inner circumferential surface) in all sections from both ends to the center in the longitudinal direction has a convex cross section that fits into the concave space where the two bars face each other so as to be in contact with the rebar. The outer circumferential surface shape of the upper cover plate is formed as an inclined surface symmetrically rising at both ends toward the center. This inclined surface may also be a horizontal surface, and a connecting pin 3 connecting the body 6 and the band 2 is placed on the inclined surface, that is, the outer circumferential surface, and the tension of the band generated by tightening the high tension bolt 7 is provided. It is the side that supports reaction force. This reaction force compresses the inner circumferential surface of the upper cover plate to the reinforcing bar to give the friction bonding force. As shown in FIG. 3, the inner circumferential surface of the upper cover plate is horizontally formed at a certain section (the section from the figure to the center position of the reinforcing bar), and the inner side of the upper cover plate is a concave part where the two bars face each other. It has a convex cross section that fits well. The upper cover plate covers the outer part of the reinforcing bar and has a horizontal section, and the upper cover covers the two bars with the band (2) even if the two bars are separated by the construction error during the overlapping reinforcement process of the reinforcing bar. It is easy to wrap the inside of the plate, and by tightening the body 6 connecting the band through the high tension bolt, two reinforcing bar can be easily pressed to the convex end face inside the inner circumferential surface of the upper cover plate.

The body 6 has a connecting pin hole for attaching the band 2 to the lower part of the body with a connecting pin 3, as shown in the drawings of FIGS. 1 to 4, and a high tension bolt 7 is provided at the center of the body. Has a hole for insertion And it has a slider (6a) and the supporting jaw (6b) so that the body does not fall by tightening the high tension bolt. With the exception of the slider, it is an iron piece with a groove which is cut only in the base jaw in a rectangular cross-sectional shape. As shown in the reaction force analysis diagram of FIG. 5, the body acts at a right angle to the outer circumferential surface of the upper cover plate at the center of the connecting pin with the reaction force for tensioning the band surrounding the outer circumferential surface of the reinforcing bar at the connecting pin and another reaction force, and compresses the upper cover plate The reaction force is formed by the introduction tension of the high tension bolt.

The connecting pin 3 is a component to be fitted to the body 6, and as shown in FIGS. 1A and 2A, the center of the connecting pin is fitted to the band-pin hook 2a and is inserted into the center of the body together with the band pin hook. Lose. Both ends of the connecting pins are placed on both ends of the upper cover plate 4 together with the body, with only the connecting pins fitted to the body, and the ends of the connecting pins press the upper cover plate by the tightening tension of the high tension bolts. And the part of tensioning band by the tightening tension of high-strength bolt is the center portion of the connecting pin.

The band 2 is a component that is connected to the body with a connecting pin 2 surrounding the outer circumferential surface of the lower cover plate 5 and the two reinforcing bars 1 as shown in the drawings in FIGS. 1 to 3. Both ends of the band are circular to fit the connecting pin to form a band-pin hook (2a). The length of the band is of sufficient length to surround the reinforcement in the lower cover plate and to connect to the body on the upper cover plate. However, the length of the band is too short to stick the bodies together on the top cover plate. Therefore, when the two bodies are tightened with high tension bolt, tension is applied to the band. And as shown in Figure 1 to 4 degrees of an embodiment of the present invention to make the outer circumferential surface of the upper cover plate as the inclined surface, even if the length of the band to be in contact with the two bodies must be very large change in length This prevents the two bodies from touching each other with band tension within the elastic limits before the band breaks.

The high tension bolt 7 is a component that is tensioned to the band by being tightened with an impactor or a torque wrench that is inserted into a high tension bolt hole provided in the body 6, as shown in FIGS. 1 and 2.

Explain how the tension introduced by the high-strength bolt acts on the rebar joint device of the present invention with reference to FIG. 4, and the reaction force diagram of FIG. 5 and FIG. Explain the size.

As shown in the cross-sectional view of FIG. 4, tightening the high tension bolt in the direction of 1 moves the bodies close to each other. At this time, the body is moved by lifting the body in the direction of 2 (parallel with the outer circumferential surface of the upper cover plate) while maintaining the horizontal posture of the bolt by the slider and the supporting jaw of the body. Then, the band attached to the connecting pin is tensioned in the direction of 3, that is, the band connecting the outer circumferential surface of the reinforcing bar at the center of the connecting pin, and this tension force presses the connecting pin toward the upper cover plate, that is, in the direction of 4 in the figure. This force pressing in the direction of 4 compresses the inner circumferential surface of the upper cover plate, that is, the hatched portion in the figure to the outer circumferential surface of the rebar. The generated direction-band tensile force of 3 and the compressive force of the direction-top cover plate of 4 can be seen that the reaction force paired with this force acts on the lower band and the lower cover plate. As a result, some sections of the band surrounding the outer circumferential surface of the reinforcing bar (in the shape of an arc) and the inner circumferential surface of the upper and lower cover plates compress the outer circumferential surface of the reinforcing bar to form a friction joint, which is a joint of the steel joint that restrains the longitudinal movement of the reinforcing bar.

In Fig. 5, when the tension introduced by the high tension bolt is T (in the figure, the direction is set to horizontal for convenience, and thus there is only a value in the X-axis direction), the tension T acts at the center of the connecting pin. In this case, the reaction force acting on the center of the connecting pin is the force (vertically indicated as R_u in the figure) on the surface where the upper cover plate and the connecting pin contact each other, and the band restrains the center of the connecting pin. R_b in the figure). Therefore, in the analysis of these two reaction forces, the direction of action of the force is perpendicular to the outer circumferential surface of the upper cover plate at the center of the connecting pin, and the direction of force action is known as the direction in which the band is tensioned at the center of the connecting pin. Only size is unknown.

The reaction force analysis sets the conditional equation that the sum of the horizontal components of these two reaction forces (the sum of the lengths of the line segments CB and DC in the figure) is the same as the tension T introduced, and the tension T is set in the X-axis direction. Reactions of two unknowns are interpreted in terms of the same size (signs only).

In this figure, the reaction force is plotted according to the conditional expression. In the figure, R_u is a force pushing at right angles to the outer circumferential surface where the upper cover plate and the connecting pin come into contact with each other. It is a force. In the cross-sectional form of this embodiment, the size of the R_u (length of the line segment OB) has a value larger than the introduction tension T (the length of the line segment OA) of the high tension bolt.

Figure 5a illustrates the force acting on the band of the portion compressing the outer circumferential surface of the rebar. The band section on which the bar is pressed is a part of the band and its shape is arc.The band tensile force R_bu (tension force at the bottom of the arc) obtained from the above 5 degrees in the direction of the center of the connecting pin (band straight section) at the upper starting point of the arc. R_b is represented by R_bu to distinguish it from

In addition, the band's tensile force R_bl acts in a straight line direction from the lower end of the arc to the lower cover plate, and the image force R_bl is given by the direction of the force, and the vertical component is interpreted by the conditional equation equal to R_bu. When R_bu and R_bl act on, the horizontal force of these two forces (the sum of the line segment AD and the line segment BC in the figure, becomes the line segment OP) is the force that compresses the band of the arc section to the outer peripheral surface of the reinforcement.

5A is a drawing. In the cross-sectional form of the present embodiment, the size of the line segment OP has a value larger than the introduction tension T of the high tension bolt.

And it can be seen that the vertical component of the force that the lower cover plate presses the reinforcing bar is equal to the vertical component of the force that the upper cover plate presses the bar in the equilibrium condition of the force, and the illustration is omitted.

As described above, the tension applied to the high-strength bolt can be interpreted as the compressive force in which the arc-shaped band compresses the reinforcing bars and the upper and lower cover plates in the compressive force by the decomposition of the force and the reaction force analysis. The compressive forces can cause the high tension bolt to have a value greater than the force causing frictional bonding, ie the tension T value due to the high tension bolt. The tension of high-strength bolt is obtained within a certain range of error by tightening torque and bolt diameter, and the value that can be structurally applied according to the type of high-strength bolt is already defined in KS standard and standard of each country. Therefore, by controlling the tightening torque of the high-strength bolt, the band tension and the reaction force acting on the outer circumferential surface of the upper and lower cover plates can be set to a value within a predetermined range. Therefore, the reinforcing bar joint of the present invention can have a predetermined reinforcement joint strength. Can be.

Due to the pair of band tensions acting on the upper and lower cover plates in the outer side of the reinforcing bar, compression forces acting in the vertical direction on the band and the outer circumferential surface of the bar are generated. This force compresses the thickness direction of the band and compresses the bars of the bar on the outer circumferential surface of the bar. Only the part where the band is in contact with the reinforcing bar is subjected to compressive deformation, and the band is compressed in such a manner as to surround the reinforcing bar. Therefore, the tensile or compressive force that constrains the joints of the bars acts at right angles to the bars, so if the bars are not sheared, the bond strength between the band and the bars is designed to be the same as the compressive force acting on the bands and bars. Expect greater value than friction bonding force of high tension bolt.

The joint device of the present invention is to increase the width of the band so as to wrap a sufficient number of reinforcing bar, so that shear failure of the reinforcing bar is not generated, and also the thickness is adjusted so that the band can withstand a large tension of the reinforcing bar as a base material It is also possible to make a device with a joint strength of greater than the allowable stress. However, it can be used for fixing the precast member by making a small size joint device having a predetermined joint strength but smaller than the allowable stress of the reinforcing bar.

The method of connecting the reinforcing bar using the present reinforcing bar connection device will be described.

As shown in Fig. 1, after the two reinforcing bars (1) to be connected to each other in the overlapping joint, the upper cover in the concave space of the surface easy to tighten the high-strength bolt in the concave space of the upper and lower reinforcing bar made by the two bars in contact Place the lower plate 4 and place the lower cover plate 5 in the concave space on the opposite side, and then wrap the outer circumferential surface of the two reinforcing bars and the lower cover plate with the bands 2 connected to the body 6 at both ends in advance. After installation, the body is placed on the upper cover plate, and the high-strength bolt is inserted into the high-tight bolt hole of the body, and the fastening nut is tightened with an impactor having a predetermined torque value.

Another method is to install a plurality of high-strength bolts on the body 6, as shown in Figure 6 to fasten with an impactor.

Another method is to install a high-strength bolt on the body having one slider 6a, as shown in FIG.

Another method is to connect the reinforcing bars in the same manner as described above using a reinforcing bar having a ring-shaped band as shown in FIG.

The joint device of the present invention is a fixed device having a rigid and rigid jointed reinforcement without position movement.

Therefore, it is possible to make a high quality reinforced concrete structure that requires the accuracy of reinforcement without disturbing reinforcement position and reinforcement spacing with subsequent work, which is very effective and economical.

Since the reinforced reinforcement can be formed into a single steel structure having rigidity as a whole, the finished reinforced concrete structure can be expected to increase allowable strength.

At present, the building is becoming larger and larger in size, and various civil structures are also required to construct a reinforced concrete structure in order to effectively endure a large external force. Therefore, the present invention is one of the technologies to meet the requirements, and in the future, various concrete structures It will be a necessary device.

In addition, the precast members can be placed in the correct position and fixed as it is, thus increasing the precision of the construction, and at the same time as the joints of the precast rebars, the precast installation can be simplified, thereby reducing the precast installation personnel.

The joint device of the present invention can reduce the length of the overlap joint of the reinforcing bar can reduce the material and labor costs.

The joint device of the present invention uses a tool used to fasten high-strength bolt of steel construction, which has already been used for its fastening performance. Therefore, the degree of fastening can be easily verified and labor costs can be reduced by mechanized and automated fastening.

In the joint apparatus of the present invention, the allowable strength of the joint portion does not vary greatly depending on the skill of the operator.

This is because the fastening force of the fastening tool is standardized by the mechanical force such as electric force and air pressure.

In addition, the tolerance can be standardized by experiments and calculations, making it easy to apply to design.

Claims (4)

In the lower part of the cross section, there is a groove in which the connecting pin 3 can be inserted in the longitudinal direction, and in the center section of the groove, the groove is made larger so that the band pin hook 3a can be inserted together, and the direction transverse to the cross section. It has a hole into which a high tension bolt can be inserted, a slider 6a which protrudes only horizontally without rotating the cross section by the tightening force of the high tension bolt, and a slider opposite to make a groove that crosses the cross section of the member. Body 6 having a support jaw (6b) for supporting; Both ends of the strip-shaped member have a pin hook (3a) to fit the connecting pin (3), and has a sufficient length surrounding the outer peripheral surface of the two overlapping reinforcing bars (1) and the lower cover plate (5) Band 2; A connecting rod (3) having a rod shape having a circular cross section and connecting the two members by inserting the band pin hook (3a) into the body (6), and having both ends placed on the upper cover plate to transfer the reaction force of the body to the upper cover plate; The two rebars (1) have convex cross sections corresponding to the concave portions facing each other, and these convex cross sections form an inner circumferential surface that is crimped with the reinforcement to generate frictional bonding force, and the outer circumferential surface is rounded so as to be easily surrounded by the band ((2)). A lower cover plate 5 having an arc cross section; The inner circumferential surface has the same center section as the lower cover plate 5 and the end section has a horizontal section extending at both ends of the convex center section so that the two reinforcing bars 1 can be wrapped in this horizontal section even if they are separated by a construction error. The cross section of the center part is effectively squeezed with two reinforcing bars and has an inner circumferential cross section having a joint friction force, and the outer circumferential cross section is formed as a straight cross section from both ends to the center to efficiently support the connecting pin and the body, thereby increasing the tension of the high tension bolt. The upper cover plate (4) formed so that the band (2) does not come into contact with the outer circumferential cross-section that is supported by the plate, and the member (2) is formed by the cross-sectional shape of the inner circumferential surface and the outer circumferential surface in the longitudinal direction such that the end section has no or no end cross section. ; When the band (2) surrounds the lower cover plate (5) and the two reinforcing bars (1) and connects the body (6) at both ends, respectively, and placed on the upper cover plate (4), it is installed in the holes in each body (2) High tension bolt (7) and nut (7) to be fastened; Reinforcing bar device consisting of. 2. The reinforcing bar device according to claim 1, wherein the lower cover plate (5) or the upper cover plate (4) is magnetic. The method of claim 1, wherein the band (2) is formed in a ring shape, it is characterized in that connecting the pin (2) in the ring shape to connect the band (2) to the body (6) without the need for the pin hook (2a) Reinforcing bar joints. After the two rebars 1 have been temporarily laid and positioned by a conventional joint method, Rebar joint method comprising the rebar joint device of claim 1 or 2.

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