Steel bar, connecting device, connecting structure, prefabricated part, assembly and method

Abstract

The invention relates to a reinforcing steel bar connecting structure which comprises two reinforcing steel bars to be connected and a reinforcing steel bar connecting device, and the reinforcing steel bar connecting device comprises a first nut, an end plate and a connecting piece; the two reinforcing steel bars to be connected are a first reinforcing steel bar and a second reinforcing steel bar; the end plate is connected to one end face of the first nut and provided with an insertion hole allowing a steel bar to be inserted therein. Expanded heads are formed at the ends of the first steel bars, and after the first steel bars extend into the end plates from the insertion holes, the end plates clamp the expanded heads to prevent the first steel bars from being pulled out in the direction away from the second steel bars; the second steel bar is connected with the connecting piece which is in threaded connection with the first nut. According to the connecting structure, mechanical connection of the steel bars is achieved through the structure that the expanded heads are clamped, and the connecting structure is firm and reliable.

Description

Technical Field

[0001] This invention relates to the field of prefabricated buildings, and in particular to a reinforcing bar, a connecting device, a connecting structure, a prefabricated component, an assembly, and a method thereof. Background Technology

[0002] Currently, the connection methods for precast components in prefabricated concrete structures, especially the vertical reinforcement connection methods for vertical components (precast wall panels / columns), mainly include: 1) welding connection of embedded parts, 2) bolt connection of embedded parts, and 3) grouting connection of reinforcement sleeves.

[0003] Embedded component welding connection is a method in which connecting steel plates are pre-placed at the connection points of components, and after the prefabricated components are installed in place, adjacent embedded steel plates between components are welded together to form a whole.

[0004] Advantages: Simple installation and operation; Disadvantages: Due to the welding process, the properties of the connecting steel plates are altered to be brittle, resulting in poor toughness / easy cracking / low connection strength, poor overall structural integrity / air tightness / seismic resistance, and poor corrosion resistance / durability; It is now an obsolete technology with a small market application range.

[0005] The bolt connection method for embedded parts involves pre-drilling bolt holes in the embedded steel plate and pre-drilling bolts at the installation location. During installation, the pre-drilled bolts are inserted into the bolt holes in the embedded steel plate of the pre-installed component and tightened with nuts. Advantages include higher connection strength than welding. Disadvantages include high cost, poor structural integrity / air tightness / seismic resistance, and poor corrosion resistance / durability; its market application is limited.

[0006] Grouting connection of reinforcing bar sleeves: The grouting sleeve consists of a sleeve open at both ends and a grout inlet and outlet on the side wall of the sleeve. One section of the sleeve is pre-embedded in the precast component, and the grout inlet and outlet are reserved on the outside of the upper component. The pre-embedded reinforcing bars of the precast component are inserted into the sleeve. During installation, the protruding reinforcing bars of the precast component to be assembled are inserted into the sleeve; after the components are installed and positioned, the joint between the two precast components is filled, and then grout is injected through the grout inlet to connect the reinforcing bars and the sleeve, thus achieving the connection function.

[0007] Advantages: After the reinforcing bar is inserted into the sleeve, grouting creates a sealed environment for the reinforcing bar, solving the corrosion / durability problem. The connection strength is superior to the welding and bolting methods mentioned above.

[0008] Disadvantages: In practical applications, the rebar sleeve grouting connection technology has the following problems that need improvement: 1. Construction is difficult due to factors such as rebar deformation, displacement, and small installation gaps; 2. Grout leakage is prone to occur and cannot be inspected; 3. The operation process is complex, requiring specialized equipment, tools, materials, and personnel; 4. High cost and difficult quality control; 5. Many factors affect the quality of the grout (materials, water-cement ratio, mixing, grouting, leakage, personnel operation, application time, etc.), making quality control difficult; 6. Since the rebar sleeve grouting connection technology uses grout to bond the rebar to the sleeve, utilizing the principle and action of friction, the grout, as the connection medium, plays a decisive role in the connection quality. It must be fully grouted, without leakage or shrinkage. However, in practical applications, especially for vertical component connections (prone to leakage and impossible to inspect), it is difficult to guarantee connection quality, resulting in poor quality control. The quality of the connection directly affects the connection strength of the rebar, leading to ineffective connections (rebar core removal), causing building safety hazards. Summary of the Invention

[0009] The first objective of this invention is to provide a connection structure and device for reinforcing bars, which has the advantages of improving the connection strength between reinforcing bars and facilitating installation.

[0010] The above-mentioned objective of this invention is achieved through the following technical solution: a rebar connection structure, comprising two rebars to be connected and a rebar connection device, the rebar connection device comprising a first nut, an end plate and a connector; the two rebars to be connected are a first rebar and a second rebar; the end plate is connected to one end face of the first nut, and the end plate has an insertion hole for inserting the rebar; the end of the first rebar is formed with an enlarged head, and after the first rebar extends into the end plate from the insertion hole, the end plate engages the enlarged head to prevent the first rebar from being pulled out in a direction away from the second rebar; the second rebar is connected to the connector, and the first nut is threadedly connected to the connector.

[0011] By adopting the above technical solution, when connecting steel bars, simply insert the first steel bar with the enlarged head into the first nut, and then thread the first nut to the connector to achieve a mechanical connection between the two steel bars. The connection operation is simple, easy to install, and the connection is reliable.

[0012] The invention is further configured such that the diameter of the insertion hole is greater than the diameter of the reinforcing bar, but less than the diameter of the enlarged head.

[0013] By adopting the above technical solution, the first nut is pre-fitted onto the first reinforcing bar and then threadedly connected to the connector. The insertion hole, which is smaller than the diameter of the enlarged head, engages the enlarged head of the first reinforcing bar, thereby achieving the connection of the two reinforcing bars.

[0014] The present invention is further configured such that: the connector is provided with an external thread in the circumferential direction, and the first nut is provided with an internal thread.

[0015] By adopting the above technical solution, the connector and the first nut are threaded together.

[0016] The present invention is further configured such that: the connector includes a second nut and an end plate, the end plate is connected to one end face of the second nut, and the end plate has an insertion hole for inserting a reinforcing bar; the end of the second reinforcing bar is formed with an enlarged head, and after the second reinforcing bar extends into the end plate from the insertion hole, the end plate engages the enlarged head; the second nut is threadedly connected to the first nut.

[0017] By adopting the above technical solution, the connector is designed with the same structure as the first nut. When connecting the reinforcing bars, the operation steps at both ends are the same, making the connection more convenient.

[0018] The invention is further configured such that: the connector is an annular inner nut, the circumferential side of the inner nut is threadedly connected to the first nut; the end of the second reinforcing bar is formed with an enlarged head, the inner ring diameter of the annular inner nut is larger than the diameter of the reinforcing bar and smaller than the diameter of the enlarged head; the enlarged head of the second reinforcing bar is engaged by the annular inner nut to prevent it from being pulled out in a direction away from the first reinforcing bar.

[0019] By adopting the above technical solution, the enlarged heads of the two steel bars can be snapped together by screwing the inner ring nut into the first nut, thereby achieving the connection of the two steel bars. The operation is simple and the connection is reliable.

[0020] The present invention is further configured such that: the connector includes a threaded hole along the length of the first reinforcing bar, the end of the second reinforcing bar is provided with an external thread, and the second reinforcing bar is screwed into the threaded hole of the connector to achieve a threaded connection.

[0021] By adopting the above technical solution, the second reinforcing bar is threadedly connected to the connector, and the first nut is threadedly connected to the connector, thereby realizing the mechanical connection of the two reinforcing bars.

[0022] The present invention is further configured such that: the connector includes an intermediate connecting post, a first nut, and an end plate, the connecting post is located between two enlarged heads, and both first nuts are threadedly connected to the intermediate connecting post.

[0023] By adopting the above technical solution, not only is the connection of the two steel bars achieved, but the gap between the two enlarged heads can also be filled by the connecting column, making the connection of the steel bars not only tensile but also compressive.

[0024] The invention is further configured to include an expansion plug or spacer for filling the gap between two reinforcing bars.

[0025] By adopting the above technical solution, the gap between the two steel bars is filled with expansion plugs or spacers, which allows the axial pressure of the two steel bars to be better transmitted and enhances the connection effect.

[0026] The present invention is further configured such that: the connector includes a sleeve, the enlarged head of the first reinforcing bar extends into the sleeve, and the first nut is threadedly connected to the sleeve wall.

[0027] The invention is further configured such that: the outer wall of the sleeve is provided with an external thread, the inner wall of the first nut is provided with an internal thread, and the sleeve is threadedly connected to the first nut.

[0028] By adopting the above technical solution, the first nut is threadedly connected to the sleeve, thereby realizing the connection between the two steel bars.

[0029] The invention is further configured to include an annular locking block located inside the first nut, the outer diameter of the locking block being larger than the diameter of the insertion hole of the end plate; the inner diameter of the locking block being larger than the diameter of the reinforcing bar but smaller than the diameter of the enlarged head; and the diameter of the insertion hole of the end plate being larger than the diameter of the enlarged head.

[0030] By adopting the above technical solution, the enlarged head of the steel bar is clamped by a locking block, thereby achieving the connection of two steel bars.

[0031] The invention is further configured such that the card block is a split structure, divided into at least two parts along the radial direction.

[0032] By adopting the above technical solution, the first nut does not need to be pre-fitted onto the reinforcing bar. Instead, it can be inserted into the reinforcing bar from the enlarged head, and then the split locking block is fastened onto the reinforcing bar. Then, the first nut is threadedly connected to the sleeve, thereby achieving the connection of the two reinforcing bars.

[0033] The invention is further configured such that each locking block includes a foot and a push rod, the push rod extending into the sleeve and contacting the enlarged head.

[0034] By adopting the above technical solution, when the first nut is tightened, the push rod can push the enlarged head deep into the sleeve and abut against the enlarged head of the other steel bar, thereby realizing the transmission of axial pressure between the two steel bars and enhancing the connection effect.

[0035] The present invention is further configured such that the contact position between the top rod and the enlarged head is provided with a shape that matches the enlarged head.

[0036] By adopting the above technical solution, it is convenient for the push rod to push the enlarged head into the sleeve.

[0037] The invention is further configured such that: the top rod portion is provided with anti-slip texture on the side facing the reinforcing bar, the inner wall of the sleeve near the first nut is provided with a flared inclined surface, and the top rod portion is provided with a matching inclined surface, so that when the top rod portion moves along the sleeve axis towards the center of the sleeve, the top rod portion is subjected to the inclined surface to move closer to the reinforcing bar and form a compression.

[0038] By adopting the above technical solution, when the first nut is tightened, the top rod of the locking block moves closer to the reinforcing bar, and the anti-slip grooves engage the reinforcing bar, thereby preventing the reinforcing bar from being pulled out of the sleeve.

[0039] The invention is further configured such that: each locking block includes a foot and a top rod, the top rod extending into the sleeve; multiple locking blocks are rotatably connected in the end plate, with the foot as the rotation axis, and the locking blocks are evenly distributed in a ring around the axis of the sleeve; when the enlarged head is inserted into the sleeve through the insertion hole of the end plate and the first nut is tightened, the top rod of the locking block is restricted by the inner wall of the sleeve, forming an inner ring structure smaller than the size of the enlarged head, preventing the first reinforcing bar from being pulled out of the sleeve.

[0040] By adopting the above technical solution, when the reinforcing bar is inserted into the sleeve, the locking block opens to allow the enlarged head to pass through; then the end plate is tightened, causing the locking block to pull the reinforcing bar into the sleeve together; because the locking block is constrained by the sleeve wall, it cannot open again, thus locking the enlarged head into the sleeve, achieving the connection between the reinforcing bar and the sleeve. This solution improves the connection strength between the reinforcing bar and the sleeve and facilitates installation.

[0041] The present invention is further configured such that the axial length of the first nut is greater than the height of the locking block.

[0042] By adopting the above technical solution, the first nut is first screwed onto the cylinder, then the reinforcing bar is inserted, and finally the first nut is tightened a second time to achieve the connection. This avoids having too many parts on the construction site, thus simplifying installation.

[0043] The invention is further configured such that: the sleeve has an internal diameter variation, divided into an open area and a constraint area; the open area is close to the end of the sleeve, and the diameter of the open area is larger than the diameter of the constraint area; the locking block can rotate in the open area toward the sleeve wall, allowing the enlarged head to extend in; after tightening the first nut, the locking block extends into the constraint area and is squeezed toward the sleeve axis by the inner wall of the sleeve, and the inner ring insertion hole size of the multiple locking blocks after tilting is smaller than the size of the enlarged head.

[0044] By adopting the above technical solution, the locking block can be opened inside the sleeve, thus ensuring that the axial length of the end plate is less than the height of the locking block, and that the end plate can be screwed onto the cylinder in advance, reducing the number of parts, avoiding part loss, and facilitating installation.

[0045] The invention is further configured such that: a first inclined surface is provided on the inner wall of the cylinder, and the inner diameter of the sleeve is changed through the first inclined surface.

[0046] By adopting the above technical solution, the locking block can enter the cylinder more smoothly during the tightening process of the end plate.

[0047] The present invention is further configured such that a matching second inclined surface is provided at the contact point between the card block and the first inclined surface.

[0048] By adopting the above technical solution, the locking block can enter the cylinder more smoothly during the tightening process of the end plate.

[0049] The invention is further configured such that: a third inclined surface is provided at the end of the card block near the axis of the end plate, and the angle formed by the third inclined surface and the plane of the end plate near the axis of the nut is less than 90 degrees.

[0050] By adopting the above technical solution, it is convenient for the enlarged head of the reinforcing bar to push open the jamming block.

[0051] The present invention is further configured such that: the end plate includes an annular nut portion and a limiting plate fixed to one end face of the nut portion; an elastic sheet is fixed to the inner wall of the nut portion; and a fixing portion is provided on the locking block, which is engaged between the elastic sheet and the limiting plate.

[0052] By adopting the above technical solution, a rotatable connection between the card block and the end plate was achieved.

[0053] The present invention is further configured such that the free end of the elastic sheet is fixedly connected to the locking block.

[0054] By adopting the above technical solution, the card block can be prevented from falling off.

[0055] The invention is further configured such that: an expansion plug hole is provided on the sleeve wall, and the expansion plug extends into the expansion plug hole to fill the gap between the ends of the two steel bars.

[0056] By adopting the above technical solution, the transmission of axial pressure between the two steel bars is guaranteed.

[0057] The invention is further configured such that: the sleeve has a grouting hole on its wall for cement slurry to flow in.

[0058] By adopting the above technical solution, the cement grout flows into the sleeve and fills the internal gaps, increasing the stability of the connection.

[0059] The invention is further configured such that: a cementitious material is provided inside the cylinder to enclose the reinforcing steel bars.

[0060] By adopting the above technical solution, the cementing material fills the gaps inside the sleeve, increasing the stability of the connection.

[0061] The invention is further configured such that: a plurality of capsules are disposed inside the cylinder, the capsules are divided into several groups, each group of capsules contains a gelling material, a steel bar extends into the sleeve, punctures the capsules inside the cylinder, the gelling material solidifies after contact with air, wraps the steel bar, and connects the steel bar to the cylinder.

[0062] By adopting the above technical solution, the capsule design facilitates the installation of gelling materials.

[0063] The invention is further configured to include a sealing gasket located between the locking block and the end plate, and a cementitious material disposed inside the sleeve; the reinforcing bar pierces the sealing gasket and penetrates into the sleeve, and the cementitious material wraps around the reinforcing bar.

[0064] By adopting the above technical solution, after the end plate is screwed onto the cylinder, the sealing gasket makes the cylinder form a sealed space, which isolates the cementitious material filled in the sleeve from the outside, thereby delaying the solidification time and facilitating on-site construction.

[0065] The invention is further configured such that an observation hole is provided on the sleeve wall for the slurry inside the sleeve to flow out.

[0066] By adopting the above technical solution, the filling quality inside the sleeve can be judged by observing the gelling material flowing out of the hole.

[0067] The present invention is further configured such that: a partition plate is provided inside the cylinder, and the partition plate is perpendicular to the axis of the sleeve.

[0068] By adopting the above technical solution, the lengths of the two steel bars extending into the cylinder can be approximately the same, thereby making the stress more uniform and the connection more secure.

[0069] The invention is further configured such that: the outer wall of the connector is provided with an external thread in the circumferential direction, and a plurality of sliding grooves are provided at the thread, the direction of the sliding grooves is parallel to the axial direction of the first nut, and the inner wall of the first nut is provided with a protruding slider, the slider being able to slide along the sliding groove and be screwed into the threaded groove.

[0070] By adopting the above technical solution, the rapid installation of the first nut is facilitated.

[0071] The present invention is further configured such that the screw-out end of the threaded groove is closed or narrowed to prevent the slider from being screwed into the groove.

[0072] By adopting the above technical solution, connection failure is prevented from occurring after the slider of the first nut is screwed into the groove.

[0073] The invention is further configured such that: both the first nut and the connector are provided with scale marks in the circumferential direction for observing the relative rotation angle between them.

[0074] By adopting the above technical solution, connection failure is prevented after the slider is screwed into the groove.

[0075] The invention is further configured such that: the outer wall of the sleeve is provided with an external thread in the circumference, and a plurality of sliding grooves are provided at the thread, the direction of the sliding grooves being parallel to the axial direction of the first nut; the inner wall of the first nut is provided with a protruding slider, the slider being able to slide along the sliding groove and be screwed into the thread; the sleeve wall is provided with a slurry outlet hole at the position of the sliding groove, and the slider is recessed in the opposite position to the slurry outlet hole to form a slurry-avoiding groove; the cementing material can flow out from the slurry outlet hole, and the cementing material in the slurry-avoiding groove of the slider is screwed into the thread along with the slider and solidifies to bond and fix the slider to the sleeve.

[0076] By adopting the above technical solution, the cementitious material in the slurry-avoiding groove of the slider is screwed into the thread along with the slider and solidifies to bond and fix the slider and the sleeve, thereby preventing the slider from rotating and achieving a better connection.

[0077] The invention is further configured such that: the sleeve is a split structure, divided into two cylindrical units along the axial direction, and a groove and a slurry outlet are provided at the splice joint of the two cylindrical units.

[0078] By adopting the above technical solution, the discharge of slurry from the discharge hole is facilitated; the installation steps are changed, making the sleeve suitable for more construction environments, especially for situations with narrow operating space.

[0079] The invention is further configured such that: the connector also includes another first nut and an end plate arranged symmetrically with respect to the sleeve; the second reinforcing bar has the same structure as the first reinforcing bar.

[0080] The invention is further configured such that: one end of the sleeve is provided with an internal thread, and a steel bar is threadedly connected to the end provided with the internal thread.

[0081] The invention is further configured such that one end of the sleeve is cold-pressed or welded to a reinforcing bar.

[0082] The invention is further configured such that: a plurality of snap-fit ​​holes are opened along the circumference of the side wall at one end of the cylinder, and snap-fit ​​blocks are installed in the snap-fit ​​holes, with the two ends of the snap-fit ​​blocks located on the inner and outer sides of the cylinder respectively; an elastic element is connected to the outer end of the cylinder, and the elastic element is fixedly installed on the cylinder; an enlarged head is provided at the end of the reinforcing bar that extends into the cylinder, and the snap-fit ​​blocks can snap the enlarged head into the cylinder.

[0083] The invention is further configured such that: multiple elastic clips are evenly distributed circumferentially on the inner sidewall of the cylinder near one end, and the elastic clips are inclinedly disposed on the inner sidewall of the cylinder; the small circular insertion hole formed by the multiple annular clips is close to the center of the cylinder, and the large circular insertion hole is far away from the center of the cylinder; an enlarged head is provided at one end that extends into the cylinder, and the elastic clips can engage the enlarged head in the cylinder.

[0084] The invention is further configured such that: one end of the cylinder is tapered, and a grouting hole is provided on the cylinder for cement slurry to enter; one end of the reinforcing bar extends into the cylinder and expands outward to form a frustum-shaped enlarged head, which is fixed by concrete poured into the sleeve.

[0085] By adopting the above technical solution, the connection method of the other end of the sleeve is changed, making the application scenarios of the sleeve more extensive. It is not only suitable for the environment of steel bar connection in cast-in-place concrete, but also suitable for the connection environment in precast floor and wall panels.

[0086] The second objective of this invention is to provide a connecting steel bar, which has the advantage of being able to be directly circulated and transported as a finished product and pre-embedded in precast concrete components, or directly transported to the site for connection and installation.

[0087] The above-mentioned objective of this invention is achieved through the following technical solution: a connecting steel bar, comprising a steel bar with an enlarged head formed at the connecting end; further comprising a first nut, the first nut being sleeved on the steel bar, the inner diameter of the opening end of the first nut being larger than the outer diameter of the enlarged head, the opening end facing the enlarged head; the other end of the first nut being connected to an end plate, the end plate having an insertion hole for inserting the steel bar, the diameter of the insertion hole being larger than the diameter of the connecting steel bar and smaller than the diameter of the enlarged head.

[0088] A third objective of this invention is to provide a precast concrete component that is easy to assemble and provides a strong connection between components after assembly. This objective is achieved through the following technical solution: a precast concrete component with several connecting reinforcing bars embedded in its connecting end face, the ends of the connecting reinforcing bars having enlarged heads extending beyond the connecting end face of the precast component; a first nut fitted onto the connecting reinforcing bars, the open end of the first nut facing the enlarged head.

[0089] The fourth objective of this invention is to provide a precast concrete component that is easy to assemble and provides a strong connection between components after assembly. This objective is achieved through the following technical solution: the component includes multiple sets of sleeves and a precast component, wherein the sleeves are embedded within the precast component, and one end of the sleeve protrudes from the end face of the precast component for tightening the first nut.

[0090] The fifth objective of this invention is to provide an assembly with the advantage of strong connection and good overall integrity between components after assembly. This objective is achieved through the following technical solution: The assembly includes multiple sets of sleeves and two prefabricated components. One prefabricated component has a sleeve embedded in its connecting end, with one end of the sleeve protruding from the end face of the connecting end for tightening with an external nut. The other prefabricated component has a connecting steel bar embedded in its connecting end, corresponding to the position of the sleeve. The connecting steel bar extends beyond the connecting end face of the prefabricated component, and an enlarged head is provided at the protruding end. This enlarged head steel bar is inserted into the sleeve, thus connecting the two prefabricated components.

[0091] The sixth objective of this invention is to provide an assembly with the advantage of strong connection and good overall integrity between components after assembly. The above-mentioned objective of this invention is achieved through the following technical solution: it includes multiple sets of connecting steel bars and sleeves, and also includes two prefabricated components; corresponding connecting steel bars are pre-embedded at the connection ends of the two prefabricated components, the connecting steel bars extend beyond the connection end face of the prefabricated components and are provided with enlarged heads, and a steel bar connecting device connects the corresponding two steel bars.

[0092] The seventh objective of this invention is to provide a method for connecting reinforcing bars and sleeves, which has the advantages of convenient installation and reliable connection. The above-mentioned objective of this invention is achieved through the following technical solution: A method for connecting reinforcing bars and sleeves, comprising the following steps: installing a first nut and a connector: fitting the first nut onto the connecting reinforcing bar with its open end facing the enlarged head; aligning the reinforcing bars: aligning the two connecting reinforcing bars axially; threading the first nut and the connector together and tightening them, so that the end plate presses against the enlarged head, thereby achieving the connection of the reinforcing bars.

[0093] The eighth objective of this invention is to provide a method for connecting reinforcing bars and sleeves, which has the advantages of convenient installation and reliable connection. The above-mentioned objectives of this invention are achieved through the following technical solutions: Installing the first nut: The first nut is fitted onto the connecting reinforcing bar, with the open end facing the enlarged head; Reinforcing bar alignment: The two connecting reinforcing bars are axially aligned; Installing the sleeve: The sleeve is fitted onto the connection position of the enlarged head; The first nut is assembled and tightened at the connection end of the sleeve, so that the end plate presses against the enlarged head, thereby achieving the connection of the reinforcing bars.

[0094] The ninth objective of this invention is to provide a method for connecting reinforcing bars and sleeves, which has the advantages of convenient installation and reliable connection. This objective is achieved through the following technical solution: Installing a first nut: The first nut is fitted onto the connecting reinforcing bar, with the open end facing the enlarged head; Aligning the reinforcing bars: The two connecting reinforcing bars are axially aligned; Installing the sleeve: The sleeve is fitted onto the connection position of the enlarged head; The first nut is assembled and tightened at the connecting end of the sleeve, so that the end plate presses against the enlarged head, thus achieving the connection of the reinforcing bars; An expansion bolt is installed between the end gaps of the two reinforcing bars, and the expansion bolt tightens the two reinforcing bars.

[0095] The tenth objective of this invention is to provide a method for connecting reinforcing bars and sleeves, which has the advantages of convenient installation and reliable connection. This objective is achieved through the following technical solution: assembling the locking block and the first nut with the sleeve body; inserting the reinforcing bar into the sleeve body; tightening the first nut, causing the locking block to press against the enlarged head, thereby achieving the connection of the reinforcing bar.

[0096] The eleventh objective of this invention is to provide a method for connecting reinforcing bars and sleeves, which has the advantages of convenient installation and reliable connection. This objective is achieved through the following technical solution: Implanting a cementitious material inside the sleeve: The cementitious material is implanted into the sleeve or a capsule is implanted into the sleeve, the amount of cementitious material implanted being greater than the volume of the reinforcing bar inserted into the sleeve, so that the cementitious material inside the sleeve is full and dense after the reinforcing bar is inserted; assembling the clamping block and the first nut with the sleeve; inserting the reinforcing bar into the sleeve; tightening the first nut, causing the clamping block to press against the enlarged head, thus achieving the connection of the reinforcing bar.

[0097] The twelfth objective of this invention is to provide a method for connecting reinforcing bars and sleeves, which has the advantages of convenient installation and reliable connection. This objective is achieved through the following technical solution: Installing the first nut: Inserting the connecting reinforcing bar into the insertion hole of the end plate of the first nut, and fitting the first nut onto the connecting reinforcing bar, with the open end of the first nut facing the enlarged head; the inner diameter of the insertion hole of the end plate of the first nut is smaller than the outer diameter of the cylinder, and also smaller than the outer diameter of the outer ring formed by multiple clamping blocks; Reinforcing bar alignment: Axially aligning the two connecting reinforcing bars; Split sleeve installation: Installing the clamping blocks on the inner wall of the cylinder unit of the split sleeve, and fastening the cylinder unit to the connection position of the enlarged head; Assembling the first nut at the connecting end of the cylinder, rotating the first nut, and the end plate of the first nut pushes the clamping blocks into the cylinder until the clamping blocks abut against the enlarged head, thus achieving the connection of the reinforcing bars.

[0098] In summary, the beneficial technical effects of the present invention are as follows: The sleeve opens by rotating the locking block and is then tightened by the end plate. The locking block is constrained by the sleeve wall, which enables the insertion and connection of the enlarged head steel bar. The structure is ingenious, easy to install, and the connection is reliable. The expansion plug and the cementitious material inside the sleeve effectively fill the gaps between the two steel bars and inside the sleeve, thus forming an effective force transmission structure and making the connection more reliable. The grouting holes allow cement grout to flow into the sleeve, filling the gaps and making installation more convenient. The inspection hole allows for easy inspection of the slurry, ensuring the quality of the connection. Attached Figure Description

[0099] Figure 1 This is a schematic diagram of the structure of the present invention, in which the reinforcing bars are connected by two external nuts; Figure 2 This is a schematic diagram of the overall structure where the reinforcing bars are connected by nuts; Figure 3 This is a schematic diagram showing the connection relationship between the second nut and the first nut on the end plate. Figure 4 This is a schematic diagram of the overall structure where the reinforcing bars are connected by the first nut and the second nut. Figure 5 This is a schematic diagram of a structure in which the end of the second reinforcing bar is threaded and connected to the second nut. Figure 6 This is a schematic diagram of the connection structure for filling the gaps between precast members with expansion plugs; Figure 7 This is a schematic diagram of the external nut connection structure with a connecting post; Figure 8 This is a schematic diagram of a connection structure in which a sleeve is installed inside the nut; Figure 9 This is a schematic diagram of a connection structure in which a sleeve is installed on the outside of the nut; Figure 10 This is a schematic diagram of a connection structure with a locking block between the enlarged head and the end plate. Figure 11 This is a schematic diagram of the ring-shaped card block structure; Figure 12 This is a schematic diagram of the split structure of the ring-shaped card block; Figure 13 This is a schematic diagram of a connection structure with an L-shaped cross-section for the card block; Figure 14 This is a schematic diagram of the connection structure between the top rod of the locking block and the inclined surface of the enlarged head; Figure 15 This is a schematic diagram of the connection structure between the top rod of the locking block and the arc surface of the enlarged head; Figure 16 This is a schematic diagram of a connection structure with anti-slip texture on the top rod part that matches the shape of the sleeve; Figure 17 This is a schematic diagram of a structure with multiple locking blocks on the end plate; Figure 18 This is a schematic diagram illustrating the process of connecting the reinforcing bars to the device via multiple clamps; Figure 19 This is a schematic diagram of the overall structure with multiple card blocks; Figure 20 This is a schematic diagram of the structure where the foot of the card block is fitted with an elastic plate that is hinged to the end plate; Figure 21 This is a schematic diagram of the connection structure for pulling out the enlarged head, which is constrained by the internal diameter change design of the sleeve. Figure 22 This is a schematic diagram of the connection structure where the inclined surface and the flared opening are matched with the shape of the card block; Figure 23 This is a schematic diagram of the connection structure where the expansion plug fills the gap between the enlarged openings through the expansion plug hole; Figure 24 This is a schematic diagram showing the connection relationship between the groove in the push rod and the shape of the enlarged head. Figure 25 This is a schematic diagram of the connection structure where the shape of the trough and the reinforcing steel are matched; Figure 26 This is a schematic diagram of the overall structure with a sealing gasket and embedded cementitious material; Figure 27 This is a schematic diagram of the structure of a sealing gasket with indentations; Figure 28 This is a schematic diagram of the structure of the sealing gasket that failed along the indentation. Figure 29 This is a schematic diagram of the connection structure of the sleeve with an observation hole for the built-in cementitious material; Figure 30 This is a schematic diagram of the connection structure with partition plates installed on the inner wall of the sleeve; Figure 31This is a schematic diagram of the connection structure where the sleeve and the partition plate are integrally formed; Figure 32 This is a schematic diagram showing the fit between the split cylindrical unit and the first nut; Figure 33 This is a schematic diagram of the connection structure where the sleeve is a separate unit; Figure 34 This is a schematic diagram of a sleeve structure with coarse threads on the outer wall; Figure 35 This is a schematic diagram of a cylinder wall structure with coarse threads on both the inner and outer walls; Figure 36 This is a schematic diagram of a cylinder wall structure with coarse threads only at both ends; Figure 37 This is a schematic diagram of a sleeve structure with coarse threads at both ends; Figure 38 This is a schematic diagram of the structure of the cylinder with the chute. Figure 39 This is a schematic diagram of a structure with symmetrical sliders installed on the inner side of the nut; Figure 40 This is a schematic diagram showing the positional relationship of the chute on the outer wall of the cylinder; Figure 41 This is a schematic diagram showing the positional relationship of the slider on the inner wall of the nut; Figure 42 This is a schematic diagram of a nut and sleeve with multiple rows of sliders in a threaded fit. Figure 43 This is a schematic diagram of a sleeve with a coarse thread that is wider at the front and narrower at the back, which fits with a nut. Figure 44 This is a schematic diagram of the structure with engraved lines on the end face of the first nut; Figure 45 This is a schematic diagram of the structure with circumferential markings on the first nut; Figure 46 This is a schematic diagram of the structure with engraved lines on the circumference of the sleeve; Figure 47 This is a schematic diagram of a structure where the slurry outlet is located at the joint of the cylinder unit; Figure 48 This is a schematic diagram of the structure in which the first nut is provided with a slurry-avoiding groove corresponding to the slurry outlet hole; Figure 49 This is a schematic diagram of a split sleeve with a groove and a slurry outlet at the joint. Figure 50 This is a schematic diagram of the structure of the first nut, which is circular in circumference. Figure 51 This is a schematic diagram of the structure of the first nut, which is hexagonal in the circumferential direction. Figure 52 This is a schematic diagram of the connection structure between the second reinforcing bar extending into the constriction and the sleeve, either by cold pressing or welding. Figure 53This is a schematic diagram of a connection structure in which a bent steel bar extends into the flat end of a sleeve. Figure 54 This is a schematic diagram of the connection structure where the enlarged head is set as a flat head; Figure 55 This is a schematic diagram of the connection structure where the flat head rotates and engages with the pin after being inserted into the anti-rotation groove. Figure 56 This is a schematic diagram of a structure with elastic clips installed on the inner wall of the cylinder; Figure 57 This is a schematic diagram of the elastic catcher with a pawl. Figure 58 This is a schematic diagram of the connection structure where the elastic connecting block abuts against the reinforcing bar through the locking interface; Figure 59 This is a schematic diagram of the connection structure with grouting holes in the cylinder wall; Figure 60 This is a schematic diagram illustrating the pull-out resistance principle after concrete is poured inside the cylinder; Figure 61 It is a structural diagram showing the shape of the hook at the end of the reinforcing bar; Figures 62-63 This is a structural schematic diagram of the shape of the enlarged head of the reinforcing bar; Figure 64 This is a schematic diagram of a structure in which the enlarged ends of both ends of the reinforcing bar are connected to the first nut; Figure 65 This is a schematic diagram of the structure in which the enlarged ends of the reinforcing bar are connected to the first nut and the ring nut, respectively. Figure 66 This is a schematic diagram of the connection structure between the protruding end of the reinforcing bar embedded in the precast component and the first nut; Figure 67 This is a schematic diagram of a structure in which the sleeve extends out of the precast component and is connected to the reinforcing bar via the first nut. Figure 68 This is a schematic diagram of a structure in which two precast components are connected by embedded steel bars. Figures 69-70 It is a schematic diagram of the connection structure of multiple precast components with multiple embedded steel bars; Figure 71 This is a schematic diagram of the connection structure of a sleeve with an annular groove; Figure 72 This is a schematic diagram of the connection structure of a sleeve with perforated stirrups.

[0100] In the diagram, 1. Reinforcing bar; 11. Enlarged head; 12. Sleeve; 13. First reinforcing bar; 14. Second reinforcing bar; 2. Cylinder; 21. Cylinder unit; 22. Expansion plug hole; 23. Groove; 24. Stirrup perforation; 25. Opening area; 26. Constraint area; 27. First inclined surface; 29. ​​Slide groove; 201. Grouting hole; 202. Grout outlet hole; 203. Observation hole; 31. First nut; 311. Elastic plate; 312. Sliding block; 313. 314. Slurry-avoiding groove; 315. Anti-slip rotation groove; 32. Second nut; 33. End plate; 331. Insertion hole; 332. Threaded hole; 34. Connecting post; 35. Expansion plug; 36. Flared mouth; 37. Inner nut; 41. Divider plate; 42. Coarse thread; 43. Threaded groove; 5. Locking block; 52. Foot; 54. Second inclined plane; 55. Third inclined plane; 56. Top rod; 57. Groove body; 61. Capsule; 62. Sealing gasket; 7. Flat mouth; 71. Hook; 72. Pin; 73. Flat head; 74. Anti-rotation groove; 75. Elastic slip; 751. Pawl; 76. Locking hole; 77. Locking block; 78. Elastic element; 9. Precast component; 91. Horizontal component; 92. Vertical component; 95. Stirrup. Detailed Implementation

[0101] The present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0102] refer to Figure 1 and Figure 2 A rebar connection structure includes two rebars 1 to be connected and a rebar 1 connecting device. The two rebars 1 to be connected are a first rebar 13 and a second rebar 14. The rebar 1 connecting device includes a first nut 31, an end plate 33, and a connector. The end plate 33 is connected to one end face of the first nut 31, and the end plate 33 has an insertion hole 331 for inserting the rebar 1. The diameter of the insertion hole 331 is larger than the diameter of the rebar 1 but smaller than the diameter of the enlarged head 11. The end of the first rebar 13 has an enlarged head 11 formed. After the first rebar 13 extends into the end plate 33 through the insertion hole 331, the end plate 33 engages the enlarged head 11 to prevent the first rebar 13 from being pulled away from the second rebar 14. The connector is an annular inner nut 37, the circumferential side of which is threaded to the first nut 31. The end of the second rebar 14 also has an enlarged head 11 formed. The inner ring diameter of the annular inner nut 37 is larger than the diameter of the rebar 1 but smaller than the diameter of the enlarged head 11. After the annular inner nut 37 is fitted onto the second reinforcing bar 14, the first reinforcing bar 13 and the second reinforcing bar 14 are aligned, and the annular inner nut 37 is screwed into the first nut 31 to achieve a threaded connection. The enlarged head 11 of the second reinforcing bar 14 is held by the annular inner nut 37, and the enlarged head 11 of the first reinforcing bar 13 is held by the end plate 33, thereby preventing the two reinforcing bars 1 from being pulled out in opposite directions.

[0103] It should be noted that, since the inner ring diameter of the inner nut 37 is smaller than the diameter of the enlarged head 11, the inner nut 37 needs to be pre-fitted onto the reinforcing bar 1 before the end of the reinforcing bar 1 is machined into the enlarged head 11. If the other end of the reinforcing bar 1 does not have an enlarged head 11, the inner nut 37 can be fitted onto the reinforcing bar 1 from that end. In this embodiment, the first nut 31 is also installed on the reinforcing bar 1 using the same method.

[0104] This solution utilizes the process of machining the end of the reinforcing bar 1 into an enlarged head 11, and then fitting an annular inner nut 37 and a first nut 31 with an end plate 33 onto different reinforcing bars 1. After threading these two nuts together, a mechanical connection is achieved between the two reinforcing bars 1. Upon tightening, the enlarged heads 11 of the two reinforcing bars 1 abut against each other, transmitting axial pressure. The two enlarged heads 11 are respectively secured by the end plate 33 and the annular inner nut 37, thus achieving a tensile strength effect. This reinforcing bar connection device has the advantages of simple structure and convenient installation. Compared with grouting sleeves, it is simpler to operate, and because it is a mechanical connection, it is more reliable. Example 2

[0105] refer to Figure 3 and Figure 4 The difference from Embodiment 1 is that the connector includes a second nut 32 and an end plate 33. The end plate 33 is connected to one end face of the second nut 32, and the end plate 33 has an insertion hole 331 for inserting the reinforcing bar 1. The end of the second reinforcing bar 14 is formed with an enlarged head 11. After the second reinforcing bar 14 extends into the end plate 33 through the insertion hole 331, the end plate 33 engages the enlarged head 11. The second nut 32 is threadedly connected to the first nut 31. This change in the connection method between the second reinforcing bar 14 and the connector makes the reinforcing bar 1 connection device applicable to more application scenarios, and also facilitates the insertion of the second nut 32 into the reinforcing bar 1 from the threaded end of the reinforcing bar 1. Example 3

[0106] refer to Figure 5 The difference from Embodiment 2 is that the end of the second reinforcing bar 14 is not provided with an enlarged head 11, but is provided with a circumferential external thread; the end plate 33 connected to the second nut 32 is provided with a threaded hole 332 along the length direction of the first reinforcing bar 13, and the second reinforcing bar 14 is screwed into the threaded hole 332 of the end plate 33 to achieve a threaded connection. Example 4

[0107] The difference from Embodiment 1 is that the end of the second reinforcing bar 14 does not have an enlarged head 11, but instead has a circumferential external thread. The annular inner nut 37 has a threaded hole 332 along the length of the first reinforcing bar 13. After the second reinforcing bar 14 is screwed into the threaded hole 332 of the annular inner nut 37, a threaded connection is achieved. (Not shown in the figure) Example 5

[0108] refer to Figure 6 and Figure 68 When two reinforcing bars 1 are embedded in a precast component 9, such as a precast floor slab, after the precast floor slab is installed and its position is fixed, there is often still a gap between the enlarged heads 11 of the two reinforcing bars 1. The gap affects the transmission of axial pressure between the two reinforcing bars 1. Therefore, an expansion plug 35 or a spacer is filled in the gap between the two reinforcing bars 1. Example 6

[0109] refer to Figure 7 The difference from Embodiment 1 is that the connector includes an intermediate connecting post 34, another first nut 31, and an end plate 33. The connecting post 34 is located between the two enlarged heads 11, and both first nuts 31 are threadedly connected to the intermediate connecting post 34. The connecting post 34 not only connects the two first nuts 31, but also fills the gap between the two reinforcing bars 1, acting as an expansion plug 35. Example 7

[0110] like Figure 8 As shown, the difference from Embodiment 6 is that the intermediate connecting column 34 is replaced by a sleeve 12, the enlarged heads 11 of the first steel bar 13 and the second steel bar 14 both extend into the sleeve 12, the outer wall of the sleeve 12 is provided with external threads, and the two first nuts 31 are threadedly connected to the sleeve 12. Example 8

[0111] like Figure 9 As shown, the difference from Embodiment 7 is that the inner wall of the sleeve 12 is provided with an internal thread, and the outer circumference of the first nut 31 is provided with an external thread. The first nut 31 is screwed into the sleeve 12 to achieve a threaded connection. Example 9

[0112] like Figure 8 and Figure 9 As shown, the difference from embodiments 7 and 8 is that: an expansion plug hole 22 is provided on the cylinder wall of the sleeve 12. The length of the expansion plug hole 22 in the longitudinal direction of the sleeve 12 is greater than the gap between the two reinforcing bars 1. The expansion plug 35 extends into the expansion plug hole 22 and fills the gap between the ends of the two reinforcing bars 1, thereby ensuring the transmission of axial pressure between the two reinforcing bars 1 (see reference). Figure 23 ).

[0113] When the two reinforcing bars 1 cannot move freely, as mentioned in Example 5, the installation steps are as follows: First nut 31 is pre-fitted onto the reinforcing bar 1; sleeve 12 is tilted at a certain angle and inserted into one of the reinforcing bars 1 through the gap between the two reinforcing bars 1; then, first nut 31 is threaded onto sleeve 12; finally, expansion plug 35 is driven into expansion plug hole 22 to fill the gap. Alternatively, after inserting sleeve 12 into the reinforcing bar 1, a shim of appropriate thickness can be inserted into the gap, then sleeve 12 can be inserted into the shim, and finally, first nut 31 is connected to sleeve 12.

[0114] Example 10: Combination Figure 10 and Figure 11 The difference from Embodiment 1 is that the diameter of the insertion hole 331 of the end plate 33 is larger than the diameter of the enlarged head 11, and the rebar 1 connecting device also includes an annular locking block 5, which is located inside the first nut 31. The outer diameter of the locking block 5 is larger than the diameter of the insertion hole 331 of the end plate 33; the inner diameter of the locking block 5 is larger than the diameter of the rebar 1 but smaller than the diameter of the enlarged head 11. In this scheme, the end plate 33 does not directly lock the enlarged head 11, but rather the force is transmitted to the end plate 33 through the locking block 5. This structure can also be applied to Embodiments 2-9.

[0115] Example 11: Combination Figure 10 and Figure 12 The difference from Embodiment 10 is that the annular locking block 5 is a split structure, divided into at least two parts radially, or possibly two separate pieces. This embodiment enables the post-installation of the rebar 1 connecting device, eliminating the need to pre-fit the first nut 31 onto the rebar 1.

[0116] During installation, after the two reinforcing bars 1 are in place, the first nut 31 is fitted onto the first reinforcing bar 13 (the inner diameter of the end plate 33 is larger than the diameter of the enlarged head 11). Then, the two locking blocks 5 are snapped together near the enlarged head 11 on the first reinforcing bar 13 and placed into the first nut 31. Finally, the first nut 31 is threadedly connected to the connector. This solution is also applicable to the corresponding or similar structures in embodiments 2-10.

[0117] This solution enables the rebar connection device to be installed later, further expanding its applicability.

[0118] Example 12: like Figure 13 As shown, the difference from embodiment 11 is that each locking block 5 has an L-shaped radial cross-section in the sleeve 12, including a foot 52 and a push rod 56, with the push rod 56 extending into the sleeve 12 and contacting the enlarged head 11.

[0119] Due to factors such as machining accuracy deviation and on-site construction environment, gaps inevitably appear in the enlarged head 11 along the length of the reinforcing bar 1 inside the sleeve 12. Even without deviation, in order to achieve a gapless fit between the enlarged head 11 and the sleeve 12 in the length direction, the sleeve 12 needs to be designed with different lengths, which affects construction efficiency.

[0120] During installation, the push rod 56 extends into the sleeve 12. As the first nut 31 is screwed in, the push rod 56 comes into contact with the enlarged head 11, thereby solving the gap problem.

[0121] For better cooperation, such as Figure 14-15As shown, the contact position between the push rod portion 56 and the enlarged head 11 is provided with a shape that matches the enlarged head 11. For example... Figure 14 and 15 When the contact surface is set as a slope or arc, part of the axial tensile force of the first steel bar 13 is converted into a radial component of the sleeve 12. The enlarged head 11 pushes the top rod 56 against the inner wall of the sleeve 12. The sleeve 12 has a cylindrical wall to bear this component of the force, thereby reducing the force on the first nut 31 and further improving the connection reliability.

[0122] Example 13: like Figure 16 As shown, the difference from Embodiment 12 is that: the top rod portion 56 has anti-slip texture on the side facing the reinforcing bar 1, and the inner wall of the sleeve 12 near the first nut 31 has a flared opening 36. The top rod portion 56 has a matching flared opening, so that when the top rod portions 56 of the multiple locking blocks 5 move along the longitudinal direction of the sleeve 12, they are subjected to the action of the flared opening and move closer to the first reinforcing bar 13, forming a compression. The anti-slip texture of the top rod portion 56 engages the first reinforcing bar 13, thereby restricting the movement of the first reinforcing bar 13 in its length direction and enhancing the reliability of the connection.

[0123] Example 14: Combination Figure 17 and Figure 19 The difference from embodiment 12 is that multiple locking blocks 5 are rotatably connected inside the end plate 33, and the locking blocks 5 are evenly distributed in a ring around the axis of the sleeve 12; when the enlarged head 11 is inserted into the sleeve 12 through the insertion hole 331 of the end plate 33 and the first nut 31 is tightened, the top rod part 56 of the locking block 5 is restricted by the inner wall of the sleeve 12, forming an inner ring structure smaller than the size of the enlarged head 11, preventing the reinforcing bar 1 from being pulled out from the sleeve 12.

[0124] Reference Figure 18 When the reinforcing bar 1 is inserted into the sleeve 12, the locking block 5 rotates and opens to allow the enlarged head 11 to pass through; then the end plate 33 is tightened, so that the locking block 5 drives the reinforcing bar 1 to be inserted into the sleeve 12 together; since the locking block 5 is constrained by the sleeve wall, it cannot be opened again, thus locking the enlarged head 11 into the sleeve 12, realizing the connection between the reinforcing bar 1 and the sleeve 12.

[0125] There are two possible procedures for installing the reinforcing bar 1 and the sleeve 12. The first is to insert the reinforcing bar 1 into the end plate 33, and then screw the end plate 33 onto the sleeve 12. The second is to first screw the end plate 33 partially onto the sleeve 12, then insert the reinforcing bar 1, and finally tighten the first nut 31 a second time to complete the connection. (Reference) Figure 22When the inner diameter of the sleeve 12 is the same, to achieve the second operation, the axial length of the first nut 31 must be greater than the height of the locking block 5, so as to simultaneously satisfy the two requirements of the end plate 33 being screwed onto the sleeve 12 and the locking block 5 being opened inside the end plate 33. Since the second case allows the end plate 33 and the sleeve 12 to be assembled into a whole, it avoids too many parts on the construction site, thus facilitating installation.

[0126] Example 15: like Figure 20 As shown, the difference from embodiment 14 is that multiple locking blocks 5 are rotatably connected within the end plate 33. They can be hinged, for example, the feet 52 of the locking blocks 5 can be connected to the end plate 33 via hinges. Alternatively, as shown, an elastic plate 311 can be fixed to the inner wall of the first nut 31, and the feet 52 can be used as the base for rotation, locking between the elastic plate 311 and the end plate 33. Under normal conditions, the elastic plate 311 presses the feet 52 of the locking blocks 5 tightly. When the reinforcing bar 1 is inserted into the end plate 33, the elastic plate 311 bends and deforms, causing the locking blocks 5 to open. After the enlarged head 11 passes through the locking blocks 5, the locking blocks 5, under the action of the elastic plate 311, tilt towards the axis of the reinforcing bar 1 and press it tightly. After the end plate 33 is tightened, the top rod 56 of the locking block 5 extends into the sleeve 12. Since the inner diameter of the sleeve 12 is smaller than the sum of the thickness of the two locking blocks 5 top rods 56 and the radial dimension of the enlarged head 11, the locking block 5 cannot be opened inside the sleeve 12, thus ensuring that the enlarged head 11 is locked inside the sleeve 12.

[0127] To prevent the locking block 5 from detaching from the elastic sheet 311 and the limiting plate during transportation, the free end of the elastic sheet 311 can be welded and fixed to the locking block 5.

[0128] Example 16: like Figure 21 As shown, the opening of the locking block 5 does not necessarily have to be done within the end plate 33. Alternatively, the internal diameter of the sleeve 12 can be varied, dividing it into an opening area 25 and a constraint area 26. The opening area 25 is close to the port of the sleeve 12, and the diameter of the opening area 25 is larger than the diameter of the constraint area 26. The locking block 5 can rotate towards the cylinder wall in the opening area 25, allowing the enlarged head 11 to extend in. After tightening the first nut 31, the top rod 56 of the locking block 5 extends into the constraint area 26 and is constrained by the inner wall of the sleeve 12. The inner ring opening size of the multiple locking blocks 5 is smaller than the size of the enlarged head 11.

[0129] like Figure 22 As shown, in order to facilitate the tightening of the end plate 33 and allow the locking block 5 to enter the cylinder 2 more smoothly, a first inclined surface 27 can be provided on the inner wall of the sleeve 12, so that the end of the sleeve 12 forms a flared mouth 36. The first inclined surface 27 inside the sleeve 12 can also realize the change of the inner diameter of the cylinder 2, thereby dividing the cylinder 2 into an open area 25 and a constrained area 26.

[0130] Preferably, the contact point between the card block 5 and the first inclined surface 27 is set as a matching second inclined surface 54.

[0131] Furthermore, in order to facilitate the expansion head 11 of the reinforcing bar 1 to push open the locking block 5, a third inclined surface 55 is provided at the end of the locking block 5 near the axis of the end plate 33. The angle formed by the third inclined surface 55 and the plane of the end plate 33 near the axis of the nut is less than 90 degrees.

[0132] like Figure 23 As shown, when both reinforcing bars 1 are inserted into the sleeve 12 and the end plate 33 is tightened, there may be a gap between the ends of the two reinforcing bars 1. This gap will affect the transmission of the axial force between the two reinforcing bars 1. Therefore, an expansion plug hole 22 can be opened on the side wall of the cylinder 2, and an expansion plug 35 can be inserted into the expansion plug hole 22 to fill the gap between the ends of the two reinforcing bars 1. The expansion plug 35 can be a single wedge-shaped expansion plug 35 or two expansion plugs 35 inserted head-to-head into the cylinder 2.

[0133] Example 17: Looking back Figure 19 The difference from Embodiment 16 is that the sleeve 12 has a grouting hole 201 on its cylinder wall for cement slurry to flow in. When concrete is poured around the sleeve 12, the cement slurry will flow into the sleeve 12 from the grouting hole 201, filling all the gaps in the cylinder 2, thereby further increasing the connection effect.

[0134] Example 18: like Figure 24 and 25 As shown, the difference from embodiment 16 is that the top rod portion 56 of the locking block 5 is provided with a groove 57 that matches the shape of the enlarged head 11 and surrounds the enlarged head 11 on the side facing the reinforcing bar 1, thereby preventing the first reinforcing bar 13 from moving away from or closer to the second reinforcing bar 14. Preferably, when there are two locking blocks 5, the end of the top rod portion 56 away from the foot portion 52 extends radially along the sleeve 12, and the two top rod portions 56 form a handle structure at the end of the enlarged head 11, thereby effectively preventing the first reinforcing bar 13 from moving into the sleeve 12. Due to the setting of the groove 57 and the handle, the axial pressure and tension of the reinforcing bar 1 can be transmitted to the first nut 31 and the sleeve 12, thereby solving the problem of axial pressure transmission and tensile strength when the reinforcing bar 1 is connected.

[0135] Example 19: The difference from Example 16 is that the cementitious material can be placed inside the sleeve 12 beforehand. After the reinforcing bar 1 is inserted into the sleeve 12, the cementitious material wraps around the reinforcing bar 1, thus solving the problem of gaps between the reinforcing bars 1. Moreover, the cementitious material can fill all gaps inside the sleeve 12, further increasing the connection effect. The cementitious material can be ordinary cement mortar, grouting material, or its air-hardening cementitious material (e.g., resin adhesive). Since the above materials solidify in a short time after contact with air, it is necessary to place the cementitious material into the sleeve 12 on the construction site and complete the insertion of the reinforcing bar 1 in a short time, which is inconvenient to use. Figure 26 As shown, to prolong this time, a sealing gasket 62 can be placed between the locking block 5 and the end plate 33. The reinforcing bar 1 pierces the sealing gasket 62 and enters the sleeve 12, where the adhesive material wraps around the reinforcing bar 1. The sealing gasket 62 can be a rubber gasket, an iron gasket, a brittle plastic gasket, or a flexible plastic film. Figure 27 and Figure 28 As shown, the sealing gasket 62 is a circular gasket. The outer circumference of the sealing gasket 62 is a complete ring, and the surface of the inner circumference has multiple recessed indentations along the radial direction. When the reinforcing bar 1 is inserted, the sealing gasket 62 is destroyed at the indentation.

[0136] Example 20: The difference from Example 19 is that: Figure 29 As shown, the cylinder 2 contains several capsules 61, which are divided into several groups. Each group of capsules 61 contains a gelling material. A reinforcing bar 1 extends into the sleeve 12, puncturing the capsules 61 inside the cylinder 2. The gelling material solidifies upon contact with air, encasing the reinforcing bar 1 and connecting it to the cylinder 2. As shown in the figure, chemical agent capsules 61 (A and B) can be directly placed inside the sleeve 12. The reinforcing bar 1 extends into the sleeve 12, puncturing the capsules 61. After a chemical reaction between agents A and B, the reinforcing bar 1 solidifies. Agents A and B can be two-component epoxy resin. The volume of chemical agent capsules 61 and B is sufficient to fill all the voids inside the cylinder 2.

[0137] Capsule 61 can also be a single-component capsule 61 containing a gelling material, which hardens upon contact with air after being punctured (not shown in the figure).

[0138] To facilitate checking whether the amount of cementitious material inside the sleeve 12 meets the requirements, an observation hole 203 can be opened on the sleeve 12 wall. When the reinforcing bar 1 extends into the cylinder 2, the cementitious material inside the sleeve 12 overflows from the observation hole 203. This observation hole 203 can also be used in Example 18.

[0139] Example 21: The difference from Examples 19 and 20 is that: Figure 30As shown, a partition plate 41 is provided inside the sleeve 12, and the partition plate 41 is perpendicular to the axis of the sleeve 12. The partition plate 41 ensures that the two reinforcing bars 1 extend into the cylinder 2 to approximately the same length, thereby making the stress more even and the connection more secure. In addition, when the connected reinforcing bars 1 are vertical reinforcing bars 1, the partition plate 41 can hang the reinforcing bar 1 connecting device on the lower reinforcing bar 1, thus facilitating the installation of the reinforcing bar 1 connecting device.

[0140] When the other end of the sleeve 12 is an open port, the partition plate 41 and the sealing gasket 62 cooperate to form a closed cavity so that the cementing material can be injected in advance.

[0141] The partition plate 41 and the sleeve 12 can be integrally formed, or they can be threaded onto the inner wall of the sleeve 12. The contact surface between the partition plate 41 and the enlarged head 11 is configured to match the shape of the enlarged head 11, such as... Figure 31 As shown, it is set as a conical surface.

[0142] A connecting hole with a diameter smaller than that of the enlarged head 11 can also be provided in the middle of the partition plate 41 so that the cementing material can flow between each other in the sleeve 12 (not shown in the figure).

[0143] In addition, the outer wall of the sleeve 12 is recessed inward to form an annular groove 23 (see reference). Figure 31 ), or the outer wall of sleeve 12 has stirrup through holes 24 (refer to) Figure 72 The stirrups 95 are wrapped around the annular groove 23 or pass through the stirrup holes 24 to connect multiple reinforcing bar 1 connecting devices into a whole. This part will be described in conjunction with the precast component 9 in a later embodiment.

[0144] Example 22: The difference from all the above embodiments is that: Figure 32 and Figure 33 As shown, the sleeve 12 can be configured as a split sleeve 12, which is divided into at least two cylindrical units 21 along its axial direction. In use, first, the reinforcing bar 1 is inserted into the end plate 33; then, the two reinforcing bars 1 are positioned opposite each other, with no gap between their ends; next, the two cylindrical units 21 are interlocked at the joint of the two reinforcing bars 1; finally, the first nut 31 is tightened onto the cylindrical body 2. The split sleeve 12 configuration changes the installation steps, making the sleeve 12 connection suitable for more construction environments.

[0145] Example 23: The difference from Embodiment 1 is that: when the reinforcing bar 1 is subjected to tensile force, the tensile force is ultimately transmitted to the threaded connection between the first nut 31 and the connector; therefore, as... Figure 34As shown, the external thread circumferentially provided on the outer wall of sleeve 12 is a coarse thread 42. Compared with conventional fine threads, this setting can speed up the installation efficiency and increase the interlocking force between threads, thereby strengthening the connection between the reinforcing bars 1 and achieving better tensile strength.

[0146] like Figure 35 As shown, when the connector includes a sleeve 12, the sleeve 12 can be configured with a coarse thread 42 structure with corresponding concave and convex inner and outer parts along its length to facilitate the processing of the sleeve 12. Moreover, this structure allows the sleeve 12 to be screwed with an outer nut on its outer wall and an annular inner nut 37 inside the sleeve 12.

[0147] Better, such as Figure 36 and Figure 37 As shown, the sleeve 12 has coarse threads 42 near both ends, and the middle section has a thickened cylinder wall. This structure can save materials while ensuring the connection effect.

[0148] It should be noted that the threaded connection in the claims and the foregoing embodiments can all be configured as the coarse thread 42 structure in this embodiment.

[0149] Example 24: The difference from Embodiment 23 is that a quick-release nut structure is provided to improve the assembly efficiency of the first nut 31 and other threaded connection components. The threaded connection between the first nut 31 and the sleeve 12 will be used as an example for explanation; please refer to [link / reference]. Figure 38 and Figure 40 The sleeve 12 has several grooves 29 at its threaded portion. The direction of the grooves 29 is parallel to the axial direction of the sleeve 12. The figure shows two grooves 29. For example... Figure 39 and Figure 41 As shown, the inner wall of the first nut 31 is provided with two protruding sliders 312. The sliders 312 are positioned opposite to the slide groove 29 and can slide along the slide groove 29 and be screwed into the threaded groove 43. Figure 39 In the diagram, only one row of sliders 312 is drawn along the length of the first nut 31. However, since the tensile strength of the reinforcing bar 1 mainly relies on the engagement of the sliders 312 with the threaded groove 43, therefore, as shown... Figure 42 As shown, slider 312 can be set to multiple rows, such as three rows.

[0150] Furthermore, the screw-out end of the threaded groove 43 is closed or constricted to prevent the slider 312 from being screwed into the groove 29. For example... Figure 43 As shown, the width of the threaded groove 43 between the two sliding grooves 29 along the screwing direction of the slider 312 is initially wide and then narrows to prevent the slider 312 from being screwed into the other sliding groove 29. Preferably, the slider 312 is also configured as a matching wedge-shaped structure.

[0151] like Figure 44 and Figure 45As shown, the end face and circumferential surface of the first nut 31 are provided with engraving lines 313, such as... Figure 46 As shown, the connector (sleeve 12 in the figure) has circumferential markings 313. When the slider 312 slides along the groove 29, the initial marking of the first nut 31 corresponds to the initial marking of the connector. After rotation, the relative rotation angle between the two can be observed by reading the markings. When there are two grooves 29, a rotation of 90 degrees is optimal.

[0152] Preferably, such as Figure 47 As shown, the sleeve 12 has a slurry outlet 202 at the position of the groove 29 on its cylinder wall. Figure 48 As shown, the slider 312 is recessed relative to the grout outlet 202 to form a grout-avoiding groove 314. When the reinforcing bar 1 is inserted into the sleeve 12, the cementitious material can flow out from the grout outlet 202; during the advancement of the slider 312, the cementitious material in the grout-avoiding groove 314 is retained, while the cementitious material in other places is scraped away; when the slider 312 is screwed into the threaded groove 43, the cementitious material in the grout-avoiding groove 314 of the slider 312 is screwed into the threaded groove 43 along with the slider 312. After this part of the cementitious material solidifies, it bonds and fixes the slider 312 and the sleeve 12. This prevents the connection from failing after the first nut 31 rotates.

[0153] Furthermore, such as Figure 49 As shown, the sleeve 12 is a split structure, divided into two cylindrical units 21 along the axial direction. A groove 29 and a slurry outlet 202 are provided at the splice joint of the two cylindrical units 21.

[0154] To facilitate the rotation and tightening operation of the first nut 31, such as Figure 50 As shown, the outer periphery of the first nut 31 is circular, and multiple anti-slip rotation grooves 315 can also be formed on its outer circumference; for example... Figure 51 As shown, the outer periphery of the first nut 31 is hexagonal to facilitate operation with a wrench or similar tool.

[0155] Example 25: The difference from Embodiments 7-24 is that the structures at both ends of the sleeve 12 in the above embodiments are the same, while only one end of the sleeve 12 in this embodiment is the same as the above embodiments, and the connection between the other end and the reinforcing bar 1 is one of the following other forms.

[0156] Connection method 1: such as Figure 52 As shown, one end of the sleeve 12 is a constricted opening, and the second reinforcing bar 14 extends into the constricted opening and is connected to the sleeve 12 by a cold pressing process or by welding.

[0157] Connection method 2: One end of the sleeve 12 is closed and has internal threads, and the second reinforcing bar 14 is threadedly connected to the port with internal threads.

[0158] Connection method three: such as Figure 53As shown, one end of the sleeve 12 is a flat opening 7, the second reinforcing bar 14 is provided with a hook 71, and the sleeve 12 is provided with a radially through-hole pin 72. The hook 71 extends into the sleeve 12 and hooks the pin 72 inserted from the pin 72 hole, thereby realizing the connection between the second reinforcing bar 14 and the sleeve 12.

[0159] Connection method four: such as Figure 54 and Figure 55 As shown, one end of the sleeve 12 is a flat opening 7, and the second reinforcing bar 14 is provided with an enlarged head 11, which is a flat head 73. The flat head 73 is inserted into the cylinder 2 through the flat opening 7 and, after rotation, engages with the cylinder 2. An anti-rotation groove 74 is also provided on the inner wall of the sleeve 12 end, perpendicular to the direction of the flat opening 7. After rotation, the flat head 73 engages with the anti-rotation groove 74. This structure is suitable for connecting vertical reinforcing bars 1.

[0160] Connection method five: such as Figure 56 As shown, multiple elastic slips 75 are evenly distributed circumferentially on the inner wall of the cylinder 2 near one end. The elastic slips 75 are inclined and positioned on the inner wall of the cylinder 2. The small circular opening formed by the multiple annular slips is close to the center of the cylinder 2, while the large circular opening is far from the center. An enlarged head 11 is provided at one end extending into the cylinder 2, and the elastic slips 75 can engage the enlarged head 11 within the cylinder 2. Combined with... Figure 57 The periphery of the slip is fixed to the inner wall of the cylinder 2, and the interior of the slip is provided with multiple pawls 751 in the circumferential direction to facilitate the insertion of the second steel bar 14.

[0161] Connection method six: such as Figure 58 As shown, multiple snap-fit ​​holes 76 are opened circumferentially on the side wall at one end of the cylinder 2. Snap-fit ​​blocks 77 are installed in the snap-fit ​​holes 76, with their two ends located on the inner and outer sides of the cylinder 2, respectively. An elastic element 78 is connected to the outer end of the cylinder 2 and is fixedly installed on the cylinder 2. An enlarged head 11 is provided at the end of the second reinforcing bar 14 that extends into the cylinder 2. The snap-fit ​​block 77 can snap the enlarged head 11 into the cylinder 2. When the second reinforcing bar 14 is inserted into the sleeve 12, the snap-fit ​​block 77 opens away from the axis. After the enlarged head 11 passes through the snap-fit ​​block 77, the snap-fit ​​block 77 moves towards the axis under the force of the elastic element 78, snapping the enlarged head 11 into the sleeve 12.

[0162] Connection method seven: like Figure 59 As shown, one end of the cylinder 2 is tapered, and a grouting hole 201 is provided on the cylinder 2 for cement slurry to enter; the end of the reinforcing bar 1 extending into the cylinder 2 expands outward to form a frustum-shaped enlarged head 11, which is fixed by concrete poured into the sleeve 12. (Reference) Figure 60When the second reinforcing bar 14 is pulled out of the sleeve 12 under tension, the enlarged head 11 of the frustum-shaped reinforcing bar 1 converts part of the tension into radial expansion force, thereby reducing the axial tension. At the same time, due to the jamming of concrete, the enlarged head 11 cannot be pulled out from the end of the sleeve 12, thus realizing the connection between the reinforcing bar 1 and the sleeve 12.

[0163] It should be noted that the enlarged head 11 of the reinforcing bar 1 described in all embodiments can be as follows: Figure 1 The end shown, which is larger than the diameter of rebar 1, can also be... Figure 61 The hook 71 is formed by bending the end of the reinforcing bar 1, or the bent end is formed by folding it back. It can also be as follows: Figure 62 and Figure 63 The various shapes shown.

[0164] Example 26: A type of steel bar, such as Figure 64 As shown, the device includes a reinforcing bar 1 with an enlarged head 11 at one end, a first nut 31, and an end plate 33. The end plate 33 is connected to one end face of the first nut 31, and has an insertion hole 331 for inserting the reinforcing bar 1. The diameter of the insertion hole 331 is larger than the diameter of the reinforcing bar 1 but smaller than the diameter of the enlarged head 11. The first nut 31 is fitted onto the reinforcing bar 1. An enlarged head 11 can be provided at both ends of a single reinforcing bar 1, and two first nuts 31 can be fitted onto it (e.g., ...). Figure 64 Alternatively, a first nut 31 can be fitted onto one end, and an annular inner nut 37 can be fitted onto the other end. Figure 65 Alternatively, one end can be configured as an external thread, and the other end as an enlarged head 11 fitted with a first nut 31. The connection between the two steel bars 1 is achieved by threaded assembly of the first nut 31 with the connecting member, such as threaded assembly with the annular inner nut 37 or threaded assembly with the sleeve 12.

[0165] Example 27: A type of precast concrete component, such as Figure 66 As shown, the precast component 9 includes a reinforcing bar 1, a first nut 31, and an end plate 33. Corresponding connecting reinforcing bars 1 are pre-embedded at the connecting ends of the precast component 9. The connecting reinforcing bars 1 extend beyond the connecting end face of the precast component 9 and are provided with an enlarged head 11. The first nut 31 is located between the end face of the precast component 9 and the enlarged head 11. One end of the first nut 31 with the end plate 33 is close to the end face of the precast component 9. The other end of the reinforcing bar 1 can be pre-embedded in the precast component 9 (as shown in the figure) or can extend beyond the end face of the precast component 9. This end can be an enlarged head 11 fitted with a first nut 31 or a ring-shaped inner nut 37, or it can be provided with external threads. The precast component 9 can be a precast floor slab, wall panel, precast beam, precast column, or precast staircase, etc.

[0166] Example 28: A type of precast concrete component, such as Figure 67 As shown, the device includes multiple sets of sleeves 12 and a prefabricated component 9. The sleeves 12 are embedded in the prefabricated component 9, and one end of the sleeve 12 protrudes from the end face of the prefabricated component 9 for tightening by the first nut 31. The connection between the end of the sleeve 12 located in the prefabricated component 9 and the reinforcing bar 1 can be a threaded connection, a cold-pressed connection, or any one of the seven connection methods described in Embodiment 24.

[0167] An assembly includes the prefabricated component 9 described above in this embodiment, and another prefabricated component 9. The connecting end of the other prefabricated component 9 is pre-embedded with a connecting steel bar 1 corresponding to the position of the sleeve 12. The connecting steel bar 1 extends out of the connecting end face of the prefabricated component 9. An enlarged head 11 is provided at the extended end of the steel bar 1. The enlarged head 11 steel bar 1 is inserted into the sleeve 12 to realize the connection of the two prefabricated components 9, thereby forming an assembly.

[0168] Example 29: An assembly, such as Figure 68 As shown, the system includes multiple sets of reinforcing bars 1 and reinforcing bar connection devices, as well as two precast components 9, with two reinforcing bars 1 respectively embedded in the two precast components 9. The precast components 9 can be precast floor slabs, wall panels, precast beams, precast columns, and precast stairs, etc. The gap between the two precast components 9 is set as a post-cast strip 93, in which concrete is poured. Figure 69 and Figure 70 As shown, the two horizontal members 91 and the two vertical members 92 are connected by a steel bar 1 connecting device (the connecting device in the figure is a sleeve 12) and then concrete is poured.

[0169] Example 30: like Figure 70 As shown, when the bottom surface of the vertical member 92 at the top is higher than the top surface of the horizontal member 91, the concrete cover thickness between the outer wall of the sleeve 12 connecting the vertically arranged reinforcing bars 1 and the outer surface of the vertical member will be relatively small. For example: the diameter of the reinforcing bar 1 is 16mm, the diameter of the enlarged head 11 is 26mm, and the outer diameter of the sleeve 12 is 40mm. Therefore, the radius of the sleeve 12 is 12mm larger than the radius of the reinforcing bar 1. Assuming the concrete cover of the reinforcing bar 1 is 35mm, the concrete cover at the sleeve 12 will only be 23mm. Since, generally, the ends of multiple reinforcing bars 1 are connected and reinforced with stirrups 95, if the stirrups 95 are placed outside the sleeve 12, the concrete cover will be significantly insufficient, affecting the quality of the component. Therefore, if... Figure 71 As shown, the outer wall of the sleeve 12 is recessed inward to form an annular groove 23, and the stirrup 95 can be installed in the groove 23 to overcome the problem of insufficient protective layer.

[0170] like Figure 72As shown, stirrup holes 24 can also be opened on the outer wall of sleeve 12, and stirrups 95 can pass through the holes to connect multiple steel bars 1, which can also reduce the impact on the thickness of the protective layer.

[0171] Example 31: A method for connecting a reinforcing bar 1 and a sleeve 12 includes the following steps: Install the first nut 31: Sleeve the first nut 31 onto the connecting steel bar 1, with the open end facing the enlarged head 11; Align the steel bars 1: Align the two connecting steel bars 1 axially; Install the cylinder 2: Sleeve the cylinder 2 onto the connection position of the enlarged head 11; Install the first nut 31 at the connection end of the cylinder 2 and tighten it, so that the end plate 33 presses against the enlarged head 11, thus realizing the connection of the steel bars 1; Install expansion bolts between the gaps at the ends of the two steel bars 1, and the expansion bolts tighten the two steel bars 1.

[0172] Example 32: A method for connecting a reinforcing bar 1 and a sleeve 12 includes the following steps: Implanting cementitious material into cylinder 2: Implanting cementitious material into cylinder 2 or implanting capsule 61 into cylinder 2, the amount of cementitious material implanted is greater than the volume of the reinforcing bar 1 inserted into sleeve 12, so that the cementitious material in sleeve 12 is full and dense after the reinforcing bar 1 is inserted; assembling the clamping block 5 and the first nut 31 with cylinder 2; inserting the reinforcing bar 1 into cylinder 2; tightening the first nut 31, so that the clamping block 5 presses against the enlarged head 11, thereby realizing the connection of the reinforcing bar 1.

[0173] Example 33: A method for connecting a reinforcing bar 1 and a sleeve 12, wherein the sleeve 12 is a split sleeve 12, and the sleeve unit 21 and the locking block 5 are aligned and assembled in advance. The process includes the following steps: Installing the first nut 31: Insert the connecting steel bar 1 into the insertion hole 331 of the end plate 33 of the first nut 31, and put the first nut 31 on the connecting steel bar 1, with the open end of the first nut 31 facing the enlarged head 11; the inner diameter of the insertion hole 331 of the end plate 33 of the first nut 31 is smaller than the outer diameter of the cylinder 2, and also smaller than the outer diameter of the multiple locking blocks 5; Aligning the steel bars 1: Align the two connecting steel bars 1 axially; Installing the split sleeve 12: Install the locking blocks 5 on the inner wall of the cylinder unit 21 of the split sleeve 12, and fasten the cylinder unit 21 to the connection position of the enlarged head 11; Assemble the first nut 31 at the connecting end of the cylinder 2, rotate the first nut 31, and the end plate 33 of the first nut 31 pushes the locking blocks 5 into the cylinder 2 until the locking blocks 5 abut against the enlarged head 11, thereby achieving the connection of the steel bars 1.

[0174] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A steel reinforcement connection structure, characterized in that: The device includes two reinforcing bars (1) to be connected and a connecting device for the reinforcing bars (1). The connecting device for the reinforcing bars (1) includes a first nut (31), an end plate (33), and a connector. The two reinforcing bars (1) to be connected are a first reinforcing bar (13) and a second reinforcing bar (14). The end plate (33) is connected to one end face of the first nut (31). The end plate (33) has a socket (331) for inserting the reinforcing bar (1). The end of the first reinforcing bar (13) is formed with an enlarged head (11). After the first reinforcing bar (13) extends into the end plate (33) from the socket (331), the end plate (33) clamps the enlarged head (11) to prevent the first reinforcing bar (13) from being pulled away from the second reinforcing bar (14). The second reinforcing bar (14) is connected to the connector, and the first nut (31) is threadedly connected to the connector.

2. The steel reinforcement connection structure according to claim 1, characterized in that: The connector includes a second nut (32) and an end plate (33). The end plate (33) is connected to one end face of the second nut (32). The end plate (33) has a socket (331) for inserting the reinforcing bar (1). The end of the second reinforcing bar (14) is formed with an enlarged head (11). After the second reinforcing bar (14) extends into the end plate (33) from the socket (331), the end plate (33) snaps the enlarged head (11) into place. The second nut (32) is threadedly connected to the first nut (31).

3. The steel reinforcement connection structure according to claim 1, characterized in that: The connector is an annular inner nut (37), and the circumferential side of the inner nut (37) is threaded to the first nut (31); the end of the second reinforcing bar (14) is formed with an enlarged head (11), the inner ring diameter of the annular inner nut (37) is larger than the diameter of the reinforcing bar (1) and smaller than the diameter of the enlarged head (11); the enlarged head (11) of the second reinforcing bar (14) is clamped by the annular inner nut (37) to prevent it from being pulled out in a direction away from the first reinforcing bar (13).

4. The steel reinforcement connection structure according to claim 1, characterized in that: The connector includes a threaded hole (332) along the length of the first reinforcing bar (13), and an external thread at the end of the second reinforcing bar (14). The second reinforcing bar (14) is screwed into the threaded hole (332) of the connector to achieve a threaded connection.

5. The steel reinforcement connection structure according to claim 1, characterized in that: The connector includes an intermediate connecting post (34), a first nut (31) as described in claim 1, and an end plate (33). The connecting post (34) is located between two enlarged heads (11), and both first nuts (31) are threaded to the intermediate connecting post (34).

6. The steel reinforcement connection structure according to claim 1, characterized in that: It also includes expansion plugs (35) or spacers to fill the gap between two reinforcing bars (1).

7. The steel reinforcement connection structure according to claim 1, characterized in that: The connector includes a sleeve (12), an enlarged head (11) of the first reinforcing bar (13) extending into the sleeve (12), and a first nut (31) threadedly connected to the sleeve (12) wall.

8. The steel reinforcement connection structure according to claim 7, characterized in that: The outer wall of the sleeve (12) is provided with external threads, and the inner wall of the first nut (31) is provided with internal threads. The sleeve (12) and the first nut (31) are threadedly connected.

9. The steel reinforcement connection structure according to claim 8, characterized in that: It also includes an annular locking block (5), which is located inside the first nut (31). The outer diameter of the locking block (5) is larger than the diameter of the insertion hole (331) of the end plate (33); the inner diameter of the locking block (5) is larger than the diameter of the reinforcing bar (1) and smaller than the diameter of the enlarged head (11); the diameter of the insertion hole (331) of the end plate (33) is larger than the diameter of the enlarged head (11).

10. The steel reinforcement connection structure according to claim 9, characterized in that: The card block (5) is a split structure, divided into at least two parts along the radial direction.

11. The steel reinforcement connection structure according to claim 10, characterized in that: Each locking block (5) includes a foot (52) and a push rod (56), the push rod (56) extending into the sleeve (12) and contacting the enlarged head (11).

12. The steel reinforcement connection structure according to claim 10, characterized in that: Each locking block (5) includes a foot (52) and a top rod (56), with the top rod (56) extending into the sleeve (12). Multiple locking blocks (5) are rotatably connected to the end plate (33), with the foot (52) as the rotation axis, and the locking blocks (5) are evenly distributed in a ring around the axis of the sleeve (12). When the enlarged head (11) is inserted into the sleeve (12) through the insertion hole (331) of the end plate (33) and the first nut (31) is tightened, the top rod (56) of the locking block (5) is restricted by the inner wall of the sleeve (12), forming an inner ring structure smaller than the size of the enlarged head (11), preventing the first reinforcing bar (13) from being pulled out of the sleeve (12).

13. The steel reinforcement connection structure according to claim 11, characterized in that: The sleeve (12) has an internal diameter variation setting, which is divided into an opening area (25) and a constraint area (26). The opening area (25) is close to the port of the sleeve (12), and the diameter of the opening area (25) is larger than the diameter of the constraint area (26). The locking block (5) can rotate in the opening area (25) towards the cylinder wall, allowing the enlarged head (11) to extend in. After tightening the first nut (31), the locking block (5) extends into the constraint area (26) and is squeezed towards the axis of the sleeve (12) by the squeezing action of the inner wall of the sleeve (12). The inner ring opening size of the multiple locking blocks (5) after tilting is smaller than the size of the enlarged head (11).

14. The steel reinforcement connection structure according to claim 11, characterized in that: An elastic plate (311) is fixed to the inner wall of the first nut (31), and the foot (52) of the locking block (5) is inserted between the elastic plate (311) and the end plate (33).

15. The steel reinforcement connection structure according to claim 11, characterized in that: The top rod (56) of the locking block (5) is provided with a groove (57) that matches the shape of the enlarged head (11) and surrounds the enlarged head (11) on the side facing the reinforcing bar (1), thereby preventing the first reinforcing bar (13) from moving away from or close to the second reinforcing bar (14).

16. The steel reinforcement connection structure according to claim 8, characterized in that: The sleeve (12) has an expansion plug hole (22) on its cylindrical wall. The expansion plug (35) extends into the expansion plug hole (22) and fills the gap between the ends of the two steel bars (1).

17. The steel reinforcement connection structure according to claim 8, characterized in that: The sleeve (12) is a split structure, and the sleeve (12) is divided into at least two cylindrical units (21) along its axial direction.

18. The steel reinforcement connection structure according to claim 8, characterized in that: The sleeve (12) contains several capsules (61), which are divided into several groups. Each group of capsules (61) contains a gelling material. The steel bar (1) extends into the sleeve (12), punctures the capsules (61) inside the cylinder (2), and the gelling material solidifies after contact with air, wrapping the steel bar (1) and connecting the steel bar (1) to the cylinder (2).

19. The steel reinforcement connection structure according to claim 10, characterized in that: It also includes a sealing gasket (62), which is located between the card block (5) and the end plate (33), and a cementing material is placed inside the sleeve (12); the reinforcing bar (1) pierces the sealing gasket (62) and enters the sleeve (12), and the cementing material wraps the reinforcing bar (1).

20. The steel reinforcement connection structure according to claim 1, characterized in that: The outer wall of the connector is provided with an external thread in the circumferential direction, and several sliding grooves (29) are provided at the thread. The direction of the sliding grooves (29) is parallel to the axial direction of the first nut (31). The inner wall of the first nut (31) is provided with a protruding slider (312). The slider (312) can slide along the sliding groove (29) and be screwed into the threaded groove (43).

21. The steel reinforcement connection structure according to any one of claims 8-20, characterized in that: The sleeve (12) has multiple snap-fit ​​holes (76) along its circumference on its side wall. Snap-fit ​​blocks (77) are installed in the snap-fit ​​holes (76). The two ends of the snap-fit ​​blocks (77) are located on the inner and outer sides of the sleeve (12), respectively. An elastic element (78) is connected to one end of the sleeve (12), and the elastic element (78) is fixedly installed on the sleeve (12). An enlarged head (11) is provided at one end of the second reinforcing bar (14) that extends into the sleeve (12). The snap-fit ​​blocks (77) can snap the enlarged head (11) into the sleeve (12).

22. The steel reinforcement connection structure according to any one of claims 8-20, characterized in that: The inner wall of the sleeve (12) is evenly distributed with multiple elastic clips (75) in the circumference. The elastic clips (75) are inclinedly arranged on the inner wall of the sleeve (12). The small circular opening formed by the multiple annular clips is close to the center of the sleeve (12), and the large circular opening is far away from the center of the sleeve (12). The end of the second steel bar (14) that extends into the sleeve (12) is provided with an enlarged head (11). The elastic clips (75) can engage the enlarged head (11) in the sleeve (12).

23. The steel reinforcement connection structure according to any one of claims 8-20, characterized in that: The sleeve (12) has a tapered end, and the cylinder (2) has a grouting hole (201) for cement slurry to enter. The end of the second steel bar (14) that extends into the sleeve (12) expands outward to form a frustum-shaped enlarged head (11), which is fixed by concrete poured into the sleeve (12).

24. A steel bar connection device as described in any one of claims 1-23.

25. A type of connecting steel bar, characterized in that: It includes a steel bar (1), the connecting end of the steel bar (1) is formed with an enlarged head (11); it also includes a first nut (31), the first nut (31) is sleeved on the steel bar (1), the inner diameter of the open end of the first nut (31) is larger than the outer diameter of the enlarged head (11), the open end faces the enlarged head (11); the other end of the first nut (31) is connected to an end plate (33), the end plate (33) is provided with a socket (331) for inserting the steel bar (1), the diameter of the socket (331) is larger than the diameter of the connecting steel bar (1) and smaller than the diameter of the enlarged head (11).

26. A precast concrete component, characterized in that: A plurality of connecting steel bars (1) as described in claim 50 are provided on the connecting end face of the precast component (9). The connecting steel bars (1) are embedded in the precast concrete component (9). The end of the connecting steel bar (1) with the enlarged head (11) extends out of the connecting end face of the precast component (9). The first nut (31) is sleeved on the connecting steel bar (1). The open end of the first nut (31) faces the enlarged head (11).

27. A precast concrete component, characterized in that: The device includes multiple sets of sleeves (12) as described in any one of claims 42-48, and also includes a prefabricated component (9), wherein the sleeves (12) are embedded in the prefabricated component (9), and one end of the sleeves (12) protrudes from the end face of the prefabricated component (9) for the first nut (31) to tighten.

28. An assembly, characterized in that: The device includes multiple sets of sleeves (12) as described in any one of claims 42-48, and also includes two prefabricated components (9). The connecting end of one prefabricated component (9) is pre-embedded with a sleeve (12), and one end of the sleeve (12) protrudes from the end face of the connecting end of the prefabricated component (9) for tightening with an external nut. The connecting end of the other prefabricated component (9) is pre-embedded with a connecting steel bar (1) corresponding to the position of the sleeve (12). The connecting steel bar (1) extends out of the connecting end face of the prefabricated component (9), and the extended end of the steel bar (1) is provided with an enlarged head (11). The enlarged head (11) and the steel bar (1) are inserted into the sleeve (12) to realize the connection of the two prefabricated components (9).

29. An assembly, characterized in that: The structure includes multiple sets of steel reinforcement connection structures as described in any one of claims 1-48, and also includes two precast components (9); the connection ends of the two precast components (9) are each pre-embedded with corresponding connecting steel bars (1), the connecting steel bars (1) extend out of the connection end face of the precast component (9) and are provided with an enlarged head (11), and the steel bar (1) connection device connects the corresponding two steel bars (1).

30. A method for connecting a reinforcing bar and a sleeve, characterized in that: Includes the following steps: Install the first nut (31) and the connector: put the first nut (31) on the connecting steel bar (1) with the open end facing the enlarged head (11); Reinforcing bar (1) alignment: The two connecting reinforcing bars (1) are aligned axially; The first nut (31) and the connector are threaded together and tightened, so that the end plate (33) presses against the enlarged head (11) to achieve the connection of the reinforcing bar (1).

31. A method for connecting a reinforcing bar and a sleeve, characterized in that: Includes the following steps: Install the first nut (31): Place the first nut (31) on the connecting steel bar (1) with the open end facing the enlarged head (11); Reinforcing bar (1) alignment: The two connecting reinforcing bars (1) are aligned axially; Install the cylinder (2): Place the cylinder (2) onto the connection position of the enlarged head (11); The first nut (31) is installed and tightened at the connecting end of the cylinder (2) so that the end plate (33) presses against the enlarged head (11) to achieve the connection of the reinforcing bar (1).

32. A method for connecting a reinforcing bar and a sleeve, characterized in that: Includes the following steps: Install the first nut (31): Place the first nut (31) on the connecting steel bar (1) with the open end facing the enlarged head (11); Reinforcing bar (1) alignment: The two connecting reinforcing bars (1) are aligned axially; Install the cylinder (2): Place the cylinder (2) onto the connection position of the enlarged head (11); The first nut (31) is installed and tightened at the connecting end of the cylinder (2) so that the end plate (33) presses against the enlarged head (11) to achieve the connection of the reinforcing bar (1); An expansion bolt is installed between the ends of the two reinforcing bars (1) to tighten the two reinforcing bars (1).

33. A method for connecting a reinforcing bar and a sleeve, characterized in that: Includes the following steps: Assemble the locking block (5) and the first nut (31) with the cylinder (2); The reinforcing bar (1) is inserted into the cylinder (2); Tighten the first nut (31) so that the clamp (5) presses against the enlarged head (11) to achieve the connection of the reinforcing bar (1).

34. A method for connecting a reinforcing bar and a sleeve, characterized in that: Includes the following steps: Implant cementitious material in the cylinder (2): Implant cementitious material in the cylinder (2) or implant capsule (61) in the cylinder (2). The amount of cementitious material implanted is greater than the volume of the steel bar (1) inserted into the sleeve (12), so that the cementitious material in the sleeve (12) is full and dense after the steel bar (1) is inserted. Assemble the locking block (5) and the first nut (31) with the cylinder (2); The reinforcing bar (1) is inserted into the cylinder (2); Tighten the first nut (31) so that the clamp (5) presses against the enlarged head (11) to achieve the connection of the reinforcing bar (1).

35. A method for connecting a reinforcing bar and a sleeve, characterized in that: Includes the following steps: Install the first nut (31): Insert the connecting steel bar (1) into the insertion hole (331) of the end plate (33) of the first nut (31), and put the first nut (31) on the connecting steel bar (1). The open end of the first nut (31) faces the enlarged head (11). The inner diameter of the insertion hole (331) of the end plate (33) of the first nut (31) is smaller than the outer diameter of the cylinder (2) and smaller than the outer diameter of the multiple locking blocks (5). Reinforcing bar (1) alignment: The two connecting reinforcing bars (1) are aligned axially; Split sleeve (12) installation: Install the locking block (5) on the inner wall of the cylinder unit (21) of the split sleeve (12), and fasten the cylinder unit (21) to the connection position of the enlarged head (11); A first nut (31) is installed at the connecting end of the cylinder (2). The first nut (31) is rotated, and the end plate (33) of the first nut (31) pushes the locking block (5) into the cylinder (2) until the locking block (5) abuts against the enlarged head (11) to realize the connection of the reinforcing bar (1).

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