Sleeve, connecting structure, reinforcing steel bar, prefabricated part and assembly body

Abstract

The utility model relates to a sleeve steel bar connecting structure which comprises a steel bar to be connected and a sleeve. Expanded heads are arranged at the ends of the steel bars; the sleeve comprises a sleeve body and an end cover assembled at the end of the sleeve body in a threaded mode. The end cover comprises an outer ring body and an end plate, a through hole larger than the diameter of the steel bar is formed in the middle of the end plate, and the end plate vertically extends inwards at the through hole to form an inner ring body; the inner diameter of the inner ring body is smaller than the diameter of the expanded head; after the end cover is assembled, the inner ring body abuts against the expansion head and is connected in the cylinder in a clamped mode. The reinforcing steel bar is clamped through the end cover through hole with the diameter smaller than that of the expanded head, and the gap between the expanded head and the end plate is filled with the inner ring body, so that the reinforcing steel bar has good tensile and compressive effects at the same time.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated buildings, and in particular to a sleeve, a connecting structure, reinforcing bars, prefabricated components and an assembly. 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, 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. Utility Model Content

[0009] The first objective of this utility model is to provide a rebar connecting sleeve and its connecting structure, which has the advantages of improving the connection strength between the rebar and the sleeve and facilitating installation.

[0010] The above-mentioned utility model objective is achieved through the following technical solution: a sleeve rebar connection structure, including a rebar to be connected and a sleeve; an enlarged head is provided at the end of the rebar; the sleeve includes a cylinder and an end cap threadedly assembled to the end of the cylinder; the end cap includes an outer ring and an end plate, the end plate having a through hole in the middle larger than the diameter of the rebar, and the end plate extending vertically inward at the through hole to form an inner ring; the inner ring extends into the cylinder, and its inner diameter is smaller than the diameter of the enlarged head; after the rebar extends into the cylinder and the end cap is assembled, the inner ring presses against and engages the enlarged head in the cylinder.

[0011] The present invention is further configured such that the end cap is an integral structure.

[0012] The present invention is further configured such that the inner ring of the end cap is threadedly connected to or inserted into the end plate.

[0013] The present invention is further configured such that: the end cap is cut in half along the axial direction to form two halves, namely the first end cap part and the second end cap part; the outer ring body and the inner ring body clamp the cylinder wall of the cylinder.

[0014] The present invention is further configured to include an elastic element that temporarily connects the first end cap and the second end cap.

[0015] The present invention is further provided with positioning protrusions and positioning grooves that interlock and cooperate with each other at the splicing seam of the first end cap and the second end cap.

[0016] The present invention is further configured such that the positioning protrusion is tooth-shaped, trapezoidal, semi-circular, or L-shaped.

[0017] The present invention is further configured such that the outer wall of the cylinder and / or the inner wall of the cylinder are threadedly connected to the end cap.

[0018] The present invention is further configured such that: the inner wall of the cylinder is threadedly connected to the outer wall of the inner ring; the outer wall of the cylinder and the inner wall of the outer ring are conical surfaces fitted together, and the diameter of the conical surface is smaller near the end of the cylinder.

[0019] The present invention is further configured such that: the outer wall of the cylinder is threadedly connected to the inner wall of the outer ring; the inner wall of the cylinder and the outer wall of the inner ring are conical surfaces fitted together, with the diameter of the conical surface being larger near the end of the cylinder.

[0020] The present invention is further configured such that the thread is a coarse thread.

[0021] The present invention is further configured such that: a plurality of sliding grooves are provided at the threaded part of the cylinder, the direction of the sliding grooves is parallel to the axial direction of the cylinder, and the inner ring and / or outer ring of the end cap are provided with matching protruding sliders, the sliders being able to slide along the sliding grooves and be screwed into the threaded grooves.

[0022] 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.

[0023] The present invention is further provided with scale marks on the circumference of both the end cap and the cylinder for observing the relative rotation angle between them.

[0024] The present invention is further configured such that: the cylinder is longitudinally cut to form two or more cylinder units that are spliced ​​together.

[0025] The present invention is further provided with positioning protrusions and positioning grooves that interlock and cooperate with each other at the splicing seam of the cylindrical unit.

[0026] 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.

[0027] The present invention is further configured such that: the partition plate and the sleeve are integrally formed or the partition plate and the inner wall of the sleeve are threaded together.

[0028] The present invention is further configured such that: a slurry passage hole with a diameter smaller than that of the enlarged head is provided in the middle of the partition plate.

[0029] The present invention is further configured such that: the sleeve has an inlet hole on its cylinder wall for cement slurry to flow in.

[0030] The present 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.

[0031] The present invention is further provided with an observation hole on the sleeve wall for observing whether the components of the sleeve body are tightly fitted together.

[0032] The present invention is further configured such that: both ends of the sleeve are provided with end caps with the same structure; the ends of the two connected steel bars have the same structure.

[0033] The present invention is further configured such that: one end of the sleeve is a flat opening, a steel bar is provided with a hook, and a radially through-hole pin hole is provided on the sleeve. The hook extends into the sleeve and hooks the pin inserted from the pin hole, thereby realizing the connection between the first steel bar and the sleeve.

[0034] The present invention is further configured such that: one end of the sleeve is a flat opening, and a steel bar is provided with an enlarged head, which is a flat head. The flat head is inserted into the cylinder through the flat opening and is engaged with the cylinder after being rotated.

[0035] The present invention is further configured such that: a plurality of snap-fit ​​holes are opened along the circumference of the cylinder wall at one end of the cylinder body, 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 body respectively; an elastic element is connected to the outer end of the cylinder body, and the elastic element is fixedly installed on the cylinder body; an enlarged head is provided at the end of the reinforcing bar that extends into the cylinder body, and the snap-fit ​​block can snap the enlarged head into the cylinder body.

[0036] The present 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 arranged on the inner sidewall of the cylinder; the small circular opening formed by the multiple annular clips is close to the center of the cylinder, and the large circular opening 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.

[0037] The present invention is further configured such that: one end of the cylinder is tapered, and an inlet hole for cement slurry to enter is provided on the cylinder; one end of the reinforcing bar extending into the cylinder expands outward to form a frustum-shaped enlarged head, and the enlarged head is fixed by concrete poured into the sleeve.

[0038] The present invention is further configured such that one end of the sleeve is threaded or cold-pressed to the reinforcing bar.

[0039] The second objective of this utility model is to provide a reinforcing bar that 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.

[0040] The above-mentioned utility model objective is achieved through the following technical solution: a reinforcing bar, comprising a single reinforcing bar with an enlarged head at its end; further comprising an end cap sleeved on the reinforcing bar, the end cap comprising an outer ring and an end plate, the end plate having a through hole larger than the diameter of the reinforcing bar in the middle, the end plate extending vertically inward at the through hole to form an inner ring; the inner ring being able to extend into the cylinder of a sleeve, its inner diameter being smaller than the diameter of the enlarged head.

[0041] The third objective of this utility model is to provide a precast concrete component that is easy to assemble and provides a strong connection between components after assembly. This utility model objective is achieved through the following technical solution: it includes multiple sets of reinforcing bars, with multiple reinforcing bars pre-embedded in the precast concrete component, the ends of the reinforcing bars with enlarged heads extending beyond the end face of the precast component; an end cap is located between the end face of the precast component and the enlarged head, with one end of the end cap having an end plate close to the end face.

[0042] The fourth objective of this utility model is to provide a pre-assembled assembly, the advantage of which is that the components are firmly connected and have good overall integrity after assembly. The above-mentioned objectives of this utility model are achieved through the following technical solution: It includes multiple sets of sleeves and connecting steel bars, and also includes two prefabricated components. Corresponding connecting steel bars are pre-embedded at the connecting ends of the two prefabricated components. The connecting steel bars extend beyond the connecting end faces of the prefabricated components and are provided with enlarged heads. The sleeves connect the corresponding two steel bars.

[0043] The present invention is further configured such that concrete is poured into the gap between the two precast components.

[0044] In summary, the beneficial technical effects of this utility model are as follows:

[0045] The steel bar is snapped together by using an end cap through-hole smaller than the diameter of the enlarged head. The gap between the enlarged head and the end plate is filled by the inner ring, thus giving the steel bar good tensile and compressive strength. This steel bar connection device has the advantages of simple structure and easy installation. Compared with grouting sleeves, it is simple to operate and more reliable because it is a mechanical connection.

[0046] The separate end cap design allows for the rear installation of the end cap, making the sleeve connection operation more convenient.

[0047] The end cap uses a combination of a sliding groove and a slider, which makes the tightening operation faster and improves installation efficiency;

[0048] The different connection structures at both ends of the sleeve make the sleeve connection applicable to more scenarios and with a wider range of applications;

[0049] The split design of the cylinder body changes the installation method of the sleeve, making the sleeve more versatile.

[0050] Steel bars fitted with inner nuts can be circulated as products and connected directly with sleeves after being transported to the site;

[0051] The assembly formed by sleeve connection has the characteristics of strong connection and good integrity;

[0052] The method of connecting and installing sleeves and reinforcing bars is simple to operate, requires no other machinery, is not affected by weather, can be installed quickly, and has reliable quality. Attached Figure Description

[0053] Figure 1 This is a schematic diagram of the connection structure between the sleeve and the reinforcing bar;

[0054] Figure 2 This is an exploded diagram of the connection structure between the sleeve and the reinforcing bar;

[0055] Figure 3 This is an exploded structural diagram of a connecting structure with a split end cap.

[0056] Figure 4 This is a schematic diagram of the split-structure end cap;

[0057] Figure 5 This is a schematic diagram of a sleeve with an elastic element.

[0058] Figure 6 This is a schematic diagram of the end cap structure where the inner ring body and the end plate are threaded together;

[0059] Figure 7 This is a schematic diagram of the end cap structure where the inner ring body and the end plate are inserted.

[0060] Figure 8 This is a schematic diagram of a sleeve structure with a conical surface on the inner wall of the cylinder;

[0061] Figure 9 This is a schematic diagram of a sleeve structure with a conical surface on the outer wall of the cylinder;

[0062] Figure 10 This is a schematic diagram of a sleeve structure with threads on both the inner and outer walls of the cylinder;

[0063] Figure 11 This is a schematic diagram of a sleeve structure with coarse threads on both the inner and outer walls;

[0064] Figure 12 This is a schematic diagram of a sleeve structure with coarse threads on the outer wall;

[0065] Figure 13 This is a schematic diagram of a sleeve structure with a groove on the outer wall parallel to the axial direction;

[0066] Figure 14 This is a schematic diagram of the end cap structure with a slider that matches the groove on the inner wall;

[0067] Figure 15 This is a schematic diagram of a sleeve with a threaded groove that is wider at the front and narrower at the back, which fits with the end cap.

[0068] Figure 16 This is a schematic diagram of the structure with engraved lines on the end face of the end cap;

[0069] Figure 17 This is a schematic diagram of the structure with engravings on the circumference of the end cap;

[0070] Figure 18 This is a schematic diagram of the structure with engraved lines on the end face of the sleeve;

[0071] Figure 19 This is a schematic diagram of a sleeve connection structure with a split cylindrical body;

[0072] Figure 20 This is a schematic diagram of a cylindrical structure with a positioning mechanism.

[0073] Figure 21 This is a schematic diagram of the structure of the cylindrical unit being assembled using positioning protrusions and positioning grooves;

[0074] Figure 22 This is a schematic diagram of the positioning protrusion of the cylindrical unit being a helical tooth;

[0075] Figure 23 This is a schematic diagram of the trapezoidal positioning protrusion of the cylindrical unit;

[0076] Figure 24 This is a schematic diagram of the splicing process where the positioning protrusions of the cylindrical unit are L-shaped.

[0077] Figure 25 This is a schematic diagram of the L-shaped positioning protrusion of the cylindrical unit;

[0078] Figure 26 This is a schematic diagram of the connection structure between two prefabricated components of a sleeve with a partition plate.

[0079] Figure 27 This is a schematic diagram of the connection structure between two precast components of a sleeve with a grout inlet hole;

[0080] Figure 28 This is a schematic diagram of the connection structure between two precast components of a sleeve with grout passage holes in a partition plate.

[0081] Figure 29 This is a schematic diagram of the connection structure of two prefabricated components of a sleeve with expansion plug holes;

[0082] Figure 30 This is a schematic diagram of the connection structure of two prefabricated components with the expansion plug inserted into the sleeve.

[0083] Figure 31This is a schematic diagram of a sleeve connection structure with an observation hole.

[0084] Figures 32-33 This is a schematic diagram of a steel bar with an enlarged head that is bent into a hook.

[0085] Figures 34-37 These are structural schematic diagrams of enlarged heads of steel bars of different shapes;

[0086] Figure 38 This is a schematic diagram of the connection structure between the reinforcing bar and the sleeve, which is either cold-pressed or welded at one end.

[0087] Figure 39 This is a schematic diagram of the structure where the reinforcing bar and the sleeve are connected by a threaded connection at one end;

[0088] Figure 40 This is a schematic diagram of a structure in which a bent steel bar extends into the flat end of a sleeve.

[0089] Figure 41 This is a schematic diagram of the connection structure where the enlarged head is set as a flat head;

[0090] Figure 42 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.

[0091] Figure 43 This is a schematic diagram of a structure with elastic clips installed on the inner wall of the cylinder;

[0092] Figure 44 This is a schematic diagram of the elastic catcher with a pawl.

[0093] Figure 45 This is a schematic diagram of the connection structure where the elastic connecting block abuts against the reinforcing bar through the locking interface;

[0094] Figure 46 This is a schematic diagram of the connection structure with grouting holes in the cylinder wall;

[0095] Figure 47 This is a schematic diagram illustrating the pull-out resistance principle after concrete is poured inside the cylinder;

[0096] Figure 48 This is a schematic diagram of a steel reinforcement structure with end caps.

[0097] Figure 49 This is a schematic diagram of a prefabricated component with end caps.

[0098] Figure 50 This is a structural diagram of the assembly;

[0099] Figure 51 This is a structural diagram of an assembly with multiple sleeves installed.

[0100] Figures 52-53It is a schematic diagram of an assembly structure consisting of multiple prefabricated components;

[0101] In the diagram, 1 is the reinforcing bar; 12 is the sleeve; 11 is the enlarged head; 2 is the cylinder; 21 is the cylinder unit; 211 is the first cylinder unit; 212 is the second cylinder unit; 213 is the positioning protrusion; 214 is the positioning groove; and 22 is the expansion plug hole. 23. Threaded groove; 24. Observation hole; 29. ​​Slide groove; 3. End cap; 31. Outer ring body; 312. Sliding block; 313. Grating line; 314. Slurry avoidance groove; 32. End plate; 321. Through hole; 322. Slot; 33. Inner ring body; 331. Insert block; 34. First end cap part; 35. Second end cap part; 36. Elastic strip; 32. Convex tooth; 33. Slot; 41. Divider plate; 411. Slurry passage hole; 42. Coarse thread; 43. Expansion plug; 6. Cap; 7. Flat mouth; 71. Hook; 72. Pin; 73. Flat head; 74. Anti-rotation groove; 75. Elastic slip; 751. Pawl; 76. Snap-fit ​​hole; 77. Snap-fit ​​block; 78. Elastic element; 79. Slurry inlet hole; 9. Precast component; 91. Horizontal component; 92. Vertical component; 93. Post-cast strip. Detailed Implementation

[0102] The present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0103] like Figure 1 and Figure 2 As shown, a connection structure between a reinforcing bar and a sleeve includes two reinforcing bars 1 to be connected and a sleeve 12. The ends of the reinforcing bars 1 are provided with enlarged heads 11. The sleeve 12 includes a cylindrical body 2 and an end cap 3 assembled at the end of the cylindrical body 2. The end cap 3 includes an outer ring 31 and an end plate 32. The end plate 32 has a through hole 321 in the middle, larger than the diameter of the reinforcing bar 1. The end plate 32 extends vertically inward at the through hole 321 to form an inner ring 33. The inner ring 33 can extend into the cylindrical body 2, and its inner diameter is smaller than the diameter of the enlarged head 11. Threads are provided on the outer wall of the end of the cylindrical body 2, and threads are provided on the inner wall of the outer ring 31 of the end cap 3.

[0104] like Figure 2As shown, during installation, the end cap 3 is pre-fitted onto the reinforcing bar 1. This can be done by fitting the end of the reinforcing bar 1 without the enlarged head 11, or by fitting the end cap 3 first and then machining the enlarged head 11 of the reinforcing bar 1. The two reinforcing bars 1 to be connected are inserted into the two ports of the cylinder 2 respectively. Then, the end cap 3 is tightened onto the sleeve 12. During tightening, the end of the inner ring 33 presses against the enlarged head 11, pushing the enlarged head 11 into the cylinder 2. When the enlarged heads 11 of the two reinforcing bars 1 abut against each other, the connection of the reinforcing bars 1 is completed. Because the inner ring 33 presses against and engages the enlarged head 11 within the cylinder 2 after the end cap 3 is assembled, it prevents the reinforcing bar 1 from being pulled out of the sleeve 12, thus achieving tensile strength. Because the enlarged heads 11 of the two reinforcing bars 1 are pushed into the middle of the cylinder 2 by the inner ring 33 and abut against the other enlarged head 11, the axial pressure of the reinforcing bars 1 is transmitted. The principle of this utility model is as follows: the end cap 3 with a through hole 321 smaller than the diameter of the enlarged head 11 is used to snap the steel bar 1 into place, and the inner ring 33 fills the gap between the enlarged head 11 and the end plate 32, so that the steel bar 1 has good tensile and compressive strength at the same time.

[0105] This utility model achieves a mechanical connection between the reinforcing bar 1 and the sleeve 12, which is more reliable than the grouting sleeve 12 connection. Moreover, the sleeve 12 is simple to operate, does not require special mechanical equipment or grouting material, and can be operated manually. Construction is not affected by the weather. Example 2

[0106] The difference from Example 1 is that: Figure 3 As shown, the end cap 3 is cut axially to form two halves, namely the first end cap portion 34 and the second end cap portion 35; the outer ring body 31 and the inner ring body 33 clamp the cylinder wall of the cylinder body 2. During the connection operation, first insert the enlarged head 11 of the reinforcing bar 1 into the cylinder body 2, then fasten the first end cap portion 34 and the second end cap portion 35 onto the reinforcing bar 1, making the end faces of the end cap 3 flush, and then screw them into the cylinder body 2 together.

[0107] This solution avoids the need to pre-fit the end cap 3 onto the reinforcing bar 1 as in Embodiment 1, and changes the operation steps. The enlarged head 11 of the reinforcing bar 1 can be processed first, and then the sleeve 12 can be installed, thereby expanding the scope of application.

[0108] Furthermore, to ensure that the end faces of the first end cap 34 and the second end cap 35 are quickly aligned during engagement, a positioning protrusion 213 and a positioning groove 214 are provided at the joint between the first end cap 34 and the second end cap 35 for mutual insertion and engagement. Figure 4 As shown, the positioning protrusion 213 is preferably set in a triangle, but it can also be set in other shapes, such as toothed, trapezoidal, semi-circular, etc., as long as it can be easily inserted and the end face is flush.

[0109] Preferably, such as Figure 5 As shown, an elastic element can also be provided to temporarily connect the first end cap 34 and the second end cap 35. The elastic element can be an elastic strip 36 that is bound to the outer wall of the outer ring body 31 of the end cap 3. A holding groove is opened circumferentially on the outer wall of the outer ring body 31, and the elastic strip 36 is inserted into the holding groove (not shown in the figure).

[0110] Before the sleeve 12 is connected, the elastic strip 36 makes the first end cap 34 and the second end cap 35 fit together one-to-one. When in use, pull the first end cap 34 and the second end cap 35 apart in opposite directions, and then put the enlarged head 11 on. Under the action of the elastic strip 36, the two snap together and align again; then the tightening operation can be performed directly. Example 3

[0111] The difference from Embodiments 1 and 2 is that the inner ring 33 of the end cap 3 is threadedly connected to or inserted into the end plate 32. For example... Figure 6 As shown, the end cap 3 is an integral ring shape, not a split structure. The outer circumferential surface of the inner ring 33 is provided with connecting threads, which can be screwed into the inner wall of the through hole 321 of the end plate 32 of the end cap 3, thereby realizing threaded assembly. Furthermore, the inner ring 33 can be a split structure composed of two semi-circular rings.

[0112] like Figure 7 As shown, an insert block 331 protrudes from one end face of the inner ring body 33, and a slot 322 is provided on the end plate 32. After the insert block 331 is inserted into the slot 322, the end face of the inner ring body 33 fits tightly against the inner wall of the end plate 32. When this insertion method is used, both the end cap 3 and the inner ring body 33 can be separate structures, thereby realizing the post-installation of the end cap 3 without having to be pre-fitted onto the reinforcing bar 1.

[0113] Example 4: The difference from Examples 1-3 lies in the way the cylinder wall of cylinder 2 and end cap 3 are fitted together, such as... Figure 8 As shown, the inner wall of the cylinder 2 and the outer wall of the inner ring 33 are fitted with a conical surface, with the diameter of the conical surface being larger near the end of the cylinder 2. Alternatively, as... Figure 9 As shown, the inner wall of the cylinder 2 is threaded to the outer wall of the inner ring 33; the outer wall of the cylinder 2 and the inner wall of the outer ring 31 are fitted with a conical surface, with the diameter of the conical surface near the end of the cylinder 2 being smaller. This conical surface fit makes it easier to align the end cap 3 when screwed into the cylinder 2. Especially when the length of the inner ring 33 with the conical surface is greater than that of the outer ring 31, or the length of the outer ring 31 with the conical surface is greater than that of the inner ring 33, the conical surfaces can engage earlier during assembly, making the positioning of the end cap 3 easier.

[0114] like Figure 10 As shown, the inner and outer walls of the cylinder 2 are both provided with threads, and the inner wall of the outer ring 31 and the outer wall of the inner ring 33 are both provided with matching threads, thereby strengthening the threaded connection. Example 5

[0115] The difference from the above embodiments is as follows: Figure 11 and Figure 12 As shown, the threads on the sleeve 12 and the end cap 3 are both coarse threads 42. This design, compared to conventional fine threads, can speed up the installation process.

[0116] like Figure 11 As shown, the cylinder wall of the cylinder 2 can be configured with coarse threads 42 with corresponding concave and convex shapes on both the inner and outer sides along its entire length to facilitate the machining of the sleeve 12. This structure can save materials while ensuring the connection effect.

[0117] Furthermore, to improve the assembly efficiency of the end cap 3 and the cylinder 2, a quick-release nut structure is provided. The following description uses the example of an external thread on the outer wall of the cylinder 2 and an internal thread on the inner wall of the outer ring 31 of the end cap 3. (Reference) Figure 12 and Figure 13 Several grooves 29 are provided at the threaded portion of the cylinder 2, and the direction of the grooves 29 is parallel to the axial direction of the sleeve 12. For example... Figure 14 As shown, the inner wall of the outer ring 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 23.

[0118] Furthermore, the screw-out end of the threaded groove 23 is closed or constricted to prevent the slider 312 from being screwed into the groove 29. For example, as Figure 15 As shown, the width of the threaded groove 23 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.

[0119] like Figure 16 and Figure 17 As shown, the end face and circumferential surface of the end cap 3 are provided with engraving lines 313, such as... Figure 18 As shown, the sleeve 12 has circumferential graduation marks, which can be graduation lines 313. When the slider 312 slides along the groove 29, the initial graduation of the end cap 3 corresponds to the initial graduation of the cylinder 2. After rotation, the relative rotation angle between the two can be observed by reading the value. When there are two grooves 29, a rotation of 90 degrees is optimal. Example 6

[0120] The difference from the above embodiments is as follows: Figure 19As shown, the sleeve 12 is a split sleeve 12, with the cylinder 2 longitudinally cut to form two or more interconnected cylinder units 2. This embodiment describes two cylinder units 2. During installation, the two cylinder units 2 are fastened to the enlarged head 11 of the reinforcing bar 1, and then the end cap 3 is assembled. This structure changes the assembly method of the integral sleeve 12, which requires the reinforcing bar 1 to be passed through the end of the sleeve 12, thus improving the applicability of the sleeve 12 to different construction environments.

[0121] Since the two cylindrical units 2 need to be joined and their ends aligned before the end cap 3 is installed, a positioning structure is set at the joint of the two cylindrical units 2 to facilitate the alignment operation. Specifically, as follows: Figure 20 and Figure 21 As shown, the cylindrical unit 2 includes a first cylindrical unit 211 and a second cylindrical unit 212. The joint of the cylindrical units 2 is provided with integrally formed matching positioning protrusions 213 and positioning grooves 214. The positioning protrusions 213 on the first cylindrical unit 211 can engage with the positioning grooves 214 on the second cylindrical unit 212. As shown, the positioning protrusions 213 can be toothed, and the positioning grooves 214 have a matching shape. Figure 22 As shown, the positioning protrusion 213 can also be a helical tooth. During installation, simply fasten the two cylindrical units 2 together, and the positioning protrusion 213 will naturally embed into the positioning groove 214, thus achieving flush alignment of the sleeve 12 ends and facilitating the installation of the tightening sleeve.

[0122] The positioning protrusion 213 of the above shape can only restrict the axial movement of the cylindrical unit 2. Therefore, further, as... Figure 23 As shown, the positioning protrusion 213 is trapezoidal. During installation, after the two cylindrical units 2 are aligned, they are radially misaligned in the sleeve 12. Then, the trapezoidal positioning protrusion 213 is inserted into the positioning groove 214. This not only restricts the axial movement of the cylindrical units 2 but also prevents the two cylindrical units 2 from separating radially, thereby further improving installation efficiency. Similarly, the positioning protrusion 213 can also be semi-circular. Or it can be as shown... Figure 24 As shown in the L-shape, the first step is to insert the positioning protrusion 213 into the positioning groove 214. The second step is to move one cylindrical unit 2 axially so that the protrusion of the L-shape hooks onto the corresponding part of the positioning groove 214, thereby preventing the two cylindrical units 2 from separating radially (see...). Figure 25 ). Example 7

[0123] The difference from the above embodiments is as follows: Figure 26 As shown, a partition plate 41 is provided inside the cylinder 2, and the partition plate 41 is perpendicular to the axis of the sleeve 12. The middle partition plate divides the inner cavity of the cylinder 2 into two, thereby achieving better centering.

[0124] The partition plate 41 and the sleeve 12 can be integrally formed (see Figure 26 , 27 (or the partition plate 41 is threadedly assembled with the inner wall of the sleeve 12.)

[0125] Furthermore, such as Figure 27 As shown, the sleeve 12 has a grout inlet hole 79 on its cylinder wall for cement grout to flow in. When the reinforcing bar 1 is connected, the concrete grout can flow into the cylinder through the grout inlet hole 79 during its rotation and pouring of concrete, thereby forming a better connection joint.

[0126] like Figure 28 As shown, a grouting hole 411 with a diameter smaller than that of the enlarged head 11 is provided in the middle of the partition plate 41 so that the concrete grout can flow between each other in the sleeve 12.

[0127] Furthermore, such as Figure 29 and Figure 30 As shown, the sleeve 12 has an expansion plug hole 22 on its cylindrical wall, and the expansion plug 43 extends into the expansion plug hole 22 to fill the gap between the ends of the two steel bars 1.

[0128] To observe the connection status of the sleeve 12, an observation hole 24 is provided on the sleeve 12 wall for observing whether the components of the sleeve 12 are tightly fitted together. Figure 31 As shown, by observing through the observation hole 24, one can see whether the enlarged head 11 is pressed tightly against the baffle plate.

[0129] like Figure 32-37 As shown, the enlarged head 11 of the reinforcing bar 1 can be a simple hook or multiple hooks 71 formed by bending. The shape of the enlarged head 11 can also be annular, or have a rectangular or rhomboid cross-section, as long as it can form an enlarged head 11 with a diameter larger than that of the reinforcing bar 1 and can be snapped into the inner cavity of the sleeve 12. Example 8

[0130] Unless otherwise specified, the structures at both ends of the sleeve 12 in the above embodiments are the same. In this embodiment, only one end of the sleeve 12 is the same as that in the above embodiments. In this embodiment, the sleeve 12 is an integral structure, and the connection between the other end and the reinforcing bar 1 is in the following other forms.

[0131] Connection method 1: such as Figure 38 As shown, one end of the sleeve 12 is a constricted opening, and the reinforcing bar 1 extends into the constricted opening and is connected to the sleeve 12 by cold pressing or welding.

[0132] Connection method two: such as Figure 39 As shown, one end of the sleeve 12 is closed and has an internal thread, and the reinforcing bar 1 is threadedly connected to the port with the internal thread.

[0133] Connection method three: such as Figure 40As shown, one end of the sleeve 12 is a flat opening 7, the first reinforcing bar 1 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 first reinforcing bar 1 and the sleeve 12.

[0134] Connection method four: such as Figure 41 and Figure 42 As shown, one end of the sleeve 12 is a flat opening 7. The first reinforcing bar 1 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 end of the sleeve 12. The anti-rotation groove 74 is 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.

[0135] Connection method five: such as Figure 43 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 44 The periphery of the slip is fixed to the inner wall of the cylinder 2, and the interior of the elastic slip 75 has multiple pawls 751 arranged circumferentially to facilitate the insertion of the reinforcing bar 1.

[0136] Connection method six: such as Figure 45 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 reinforcing bar 1 that extends into the cylinder 2, and the snap-fit ​​block 77 can snap the enlarged head 11 into the cylinder 2. When the reinforcing bar 1 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.

[0137] Connection method seven:

[0138] like Figure 46 As shown, one end of the cylinder 2 is tapered, and an inlet hole 79 for cement grout to enter is provided on the cylinder 2; 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 47When the reinforcing bar 1 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. Example 9

[0139] like Figure 48 As shown, a reinforcing bar 1 includes a reinforcing bar 1 and an inner nut. The end of the reinforcing bar 1 is formed with an enlarged head 11. It also includes an end cap 3 fitted onto the reinforcing bar 1. The end cap 3 includes an outer ring 31 and an end plate 32. The end plate 32 has a through hole 321 larger than the diameter of the reinforcing bar 1 in the middle. The end plate 32 extends vertically inward at the through hole 321 to form an inner ring 33. The inner ring 33 can extend into the cylinder 2 of the sleeve 12, and its inner diameter is smaller than the diameter of the enlarged head 11. With this reinforcing bar 1, the end cap 3 is already suspended on the reinforcing bar 1 after the enlarged head 11 is processed, and the reinforcing bar 1 is circulated and transported in the market as a finished product. During installation, two reinforcing bars 1 are arranged coaxially opposite each other, and then the end cap 3 is assembled with the sleeve 12 to achieve connection.

[0140] Example 10:

[0141] like Figure 49 As shown, a precast concrete component, which can be a precast slab, precast beam, precast column, etc., includes multiple reinforcing bars 1 and multiple end caps 3. The ends of the reinforcing bars 1 are formed with enlarged heads 11. The diameter of the through hole 321 of the end plate 32 is larger than the diameter of the reinforcing bar 1 but smaller than the diameter of the enlarged head 11. The end cap 3 is fitted onto the reinforcing bar 1. The end of the reinforcing bar 1 with the enlarged head 11 extends out of the end face of the precast component. The end cap 3 is located between the end face of the precast component and the enlarged head 11, and the end of the end cap 3 with the end plate 32 is close to the end face. Using the reinforcing bars 1 in Embodiment 9, they are poured into the precast concrete component 9. After the precast component 9 is transported to the construction site, it is hoisted, and then the enlarged heads 11 of the reinforcing bars 1 of adjacent precast components 9 are connected to each other using sleeves 12.

[0142] Example 11:

[0143] An assembly, such as Figure 50 and Figure 51 As shown, the assembly includes multiple sets of reinforcing bars 1 and sleeves 12, as well as two precast components 9. Corresponding connecting reinforcing bars 1 are pre-embedded at the connecting ends of the two precast components 9. The connecting reinforcing bars 1 extend beyond the connecting end face of the precast component 9 and are provided with enlarged heads 11. 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 52 and Figure 53As shown, the two horizontal members 91 and the two vertical members 92 are connected by a sleeve 12 and then concrete is poured.

[0144] Example 12:

[0145] A method for connecting a reinforcing bar and a sleeve includes the following steps: (integral sleeve 12, integral end cap 3)

[0146] Install end cap 3 and cylinder 2: Pre-fit the overall end cap 3 onto the reinforcing bar 1 of the enlarged head 11; fit the cylinder 2 onto any one of the reinforcing bars 1;

[0147] Alignment of steel bars 1: Align two steel bars 1 with enlarged heads 11 axially; when there is a gap between the ends of the two steel bars 1, insert a plug or expansion plug 43 between the two enlarged heads 11.

[0148] The cylinder 2 is re-sleeved to the connection position of the enlarged head 11;

[0149] Tighten end cap 3: Install end cap 3 at the connecting end of cylinder 2 and tighten it so that the inner ring 33 presses against and locks the enlarged head 11 into the cylinder 2.

[0150] Example 13:

[0151] A method for connecting a reinforcing bar and a sleeve includes the following steps: (the integral sleeve 12 and the inner ring of the end cap 3 are assembled structures).

[0152] Install end cap 3 and cylinder 2: Pre-fit the outer ring 31 of the integral end cap 3 onto the reinforcing bar 1 of the enlarged head 11; fit the cylinder 2 onto any one of the reinforcing bars 1;

[0153] Alignment of steel bars 1: Align two steel bars 1 with enlarged heads 11 axially; when there is a gap between the ends of the two steel bars 1, insert a plug or expansion plug 43 between the two enlarged heads 11.

[0154] Assemble the inner ring 33 with the end cap 3; resleeve the cylinder 2 back to the connection position of the enlarged head 11;

[0155] Tighten end cap 3: Install end cap 3 at the connecting end of cylinder 2 and tighten it so that the inner ring 33 presses against and locks the enlarged head 11 into the cylinder 2.

[0156] Example 14:

[0157] A method for connecting a reinforcing bar and a sleeve includes the following steps: (split sleeve 12, integral end cap 3)

[0158] Install end cap 3: Pre-fit the entire end cap 3 onto the steel bar 1 of the enlarged head 11;

[0159] Alignment of steel bars 1: Align two steel bars 1 with enlarged heads 11 axially; when there is a gap between the ends of the two steel bars 1, insert a plug or expansion plug 43 between the two enlarged heads 11.

[0160] Install the split sleeve 12: Attach the cylindrical unit 2 of the split sleeve 12 to the position of the enlarged head 11;

[0161] Tighten end cap 3: Install end cap 3 at the connecting end of cylinder 2 and tighten it so that the inner ring 33 presses against and locks the enlarged head 11 into the cylinder 2.

[0162] Example 15:

[0163] A method for connecting a reinforcing bar and a sleeve includes the following steps: (the split sleeve 12 and the inner ring of the end cap 3 are assembled structures)

[0164] Install end cap 3: Pre-fit the outer ring 31 of the overall end cap 3 onto the steel bar 1 of the enlarged head 11;

[0165] Alignment of steel bars 1: Align two steel bars 1 with enlarged heads 11 axially; when there is a gap between the ends of the two steel bars 1, insert a plug or expansion plug 43 between the two enlarged heads 11.

[0166] Assemble the inner ring 33 with the end cap 3; Install the split sleeve 12: fasten the cylindrical unit 2 of the split sleeve 12 to the position of the enlarged head 11;

[0167] Tighten end cap 3: Install end cap 3 at the connecting end of cylinder 2 and tighten it so that the inner ring 33 presses against and locks the enlarged head 11 into the cylinder 2.

[0168] Example 16:

[0169] A method for connecting a reinforcing bar and a sleeve includes the following steps: (integral sleeve 12, separate end cap 3)

[0170] Install cylinder 2: Fit the integral sleeve 12 onto any one of the steel bars 1;

[0171] Alignment of steel bars 1: Align two steel bars 1 with enlarged heads 11 axially; when there is a gap between the ends of the two steel bars 1, insert a plug or expansion plug 43 between the two enlarged heads 11.

[0172] Install the segmented end caps 3: Fasten multiple end caps 3 onto the outer periphery of the reinforcing bar 1 and the two ends of the cylinder 2 to form a complete end cap 3;

[0173] Tighten end cap 3: Install end cap 3 at the connecting end of cylinder 2 and tighten it so that the inner ring 33 presses against and locks the enlarged head 11 into the cylinder 2.

[0174] Example 17:

[0175] A method for connecting a reinforcing bar and a sleeve includes the following steps: (split sleeve 12, split end cap 3)

[0176] Alignment of steel bars 1: Align two steel bars 1 with enlarged heads 11 axially; when there is a gap between the ends of the two steel bars 1, insert a plug or expansion plug 43 between the two enlarged heads 11.

[0177] The split sleeve 12 and the split end cap 3 are assembled and fastened at the connection position of the enlarged head 11;

[0178] The end cap 3 is rotated 90 degrees to achieve connection.

[0179] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A sleeve-type rebar connection structure, characterized in that: The assembly includes a reinforcing bar (1) to be connected and a sleeve (12); the end of the reinforcing bar (1) is provided with an enlarged head (11); the sleeve (12) includes a cylinder (2) and an end cap (3) threaded onto the end of the cylinder (2); the end cap (3) includes an outer ring (31) and an end plate (32), the end plate (32) has a through hole (321) larger than the diameter of the reinforcing bar (1) in the middle, and the end plate (32) extends vertically inward at the through hole (321) to form an inner ring (33); the inner ring (33) extends into the cylinder (2), and its inner diameter is smaller than the diameter of the enlarged head (11); the reinforcing bar (1) extends into the cylinder (2), and after the end cap (3) is assembled, the inner ring (33) presses against and engages the enlarged head (11) in the cylinder (2).

2. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The end cap (3) is an integral structure.

3. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The inner ring (33) of the end cap (3) is threaded or plugged into the end plate (32).

4. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The end cap (3) is cut in half along the axial direction to form a first end cap part (34) and a second end cap part (35); the outer ring body (31) and the inner ring body (33) clamp the cylinder wall of the cylinder body (2).

5. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The outer wall of the cylinder (2) and / or the inner wall of the cylinder (2) are threadedly connected to the end cap (3).

6. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The inner wall of the cylinder (2) is threaded to the outer wall of the inner ring (33); the outer wall of the cylinder (2) and the inner wall of the outer ring (31) are in conical fit, and the diameter of the conical surface is smaller near the end of the cylinder (2).

7. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The outer wall of the cylinder (2) is threaded to the inner wall of the outer ring (31); the inner wall of the cylinder (2) and the outer wall of the inner ring (33) are in conical fit, and the diameter of the conical surface is larger near the end of the cylinder (2).

8. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The cylinder (2) has several grooves (29) at the threaded part. The direction of the grooves (29) is parallel to the axis of the cylinder (2). The inner ring (33) and / or outer ring (31) of the end cap (3) are provided with matching protruding sliders (312). The sliders (312) can slide along the grooves (29) and be screwed into the threaded grooves (23).

9. The sleeve-type steel bar connection structure according to claim 1, characterized in that: The cylinder (2) is longitudinally cut to form two or more cylinder units (21) that are spliced ​​together.

10. The sleeve-type steel bar connection structure according to any one of claims 1-9, characterized in that: Both ends of the sleeve (12) are equipped with end caps (3), which have the same structure; the ends of the two connected steel bars (1) have the same structure.

11. The sleeve-type steel bar connection structure according to any one of claims 1-9, characterized in that: One end of the sleeve (12) is a flat opening (7), a steel bar (1) is provided with a hook (71), and a radial through-hole is provided on the sleeve (12). The hook (71) extends into the sleeve (12) and hooks the pin (72) inserted from the pin hole, thereby realizing the connection between the steel bar (1) and the sleeve (12).

12. The sleeve-type steel bar connection structure according to any one of claims 1-9, characterized in that: One end of the sleeve (12) is a flat opening (7), and a steel bar (1) is provided with an enlarged head (11). The enlarged head (11) is a flat head (73). The flat head (73) is inserted into the cylinder (2) through the flat opening (7) and rotated to engage with the cylinder (2).

13. The sleeve-type steel bar connection structure according to any one of claims 1-9, characterized in that: Multiple snap-fit ​​holes (76) are opened along the circumference of the cylinder wall at one end of the cylinder (2). 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 cylinder (2), respectively. An elastic element (78) is connected to the outer end of the cylinder (2). The elastic element (78) is fixedly installed on the cylinder (2). An enlarged head (11) is provided at the end of the steel bar (1) that extends into the cylinder (2). The snap-fit ​​blocks (77) can snap the enlarged head (11) into the cylinder (2).

14. The sleeve-type steel bar connection structure according to any one of claims 1-9, characterized in that: Multiple elastic clips (75) are evenly distributed around the inner wall of the cylinder (2) near one end. The elastic clips (75) are inclined on the inner wall of the cylinder (2). The small circular opening formed by the multiple annular clips is close to the center of the cylinder (2), and the large circular opening is far away from the center of the cylinder (2). An enlarged head (11) is provided at one end that extends into the cylinder (2). The elastic clips (75) can engage the enlarged head (11) inside the cylinder (2).

15. The sleeve-type steel bar connection structure according to any one of claims 1-9, characterized in that: One end of the cylinder (2) is tapered, and the cylinder (2) is provided with a grout inlet (79) for cement grout to enter; the end of the reinforcing bar (1) extending into the cylinder (2) expands outward to form a frustum-shaped enlarged head (11), and the enlarged head (11) is fixed by concrete poured into the sleeve (12).

16. The sleeve-type steel bar connection structure according to any one of claims 1-9, characterized in that: One end of the sleeve (12) is threaded or cold-pressed to the reinforcing bar (1).

17. A sleeve, characterized in that: The sleeve as described in any one of claims 1-16.

18. A type of reinforcing steel bar, characterized in that: It includes a steel bar (1), the end of which is formed with an enlarged head (11); it also includes an end cap (3) sleeved on the steel bar (1), the end cap (3) includes an outer ring (31) and an end plate (32), the end plate (32) has a through hole (321) larger than the diameter of the steel bar (1) in the middle, and the end plate (32) extends vertically inward at the through hole (321) to form an inner ring (33); the inner ring (33) can extend into the cylinder (2) of the sleeve (12), and its inner diameter is smaller than the diameter of the enlarged head (11).

19. A precast concrete component, characterized in that: Includes multiple sets of steel bars (1) as described in claim 18, multiple steel bars (1) are embedded in the precast concrete component, the end of the steel bar (1) with an enlarged head (11) extends out of the end face of the precast component; end cap (3) is located between the end face of the precast component and the enlarged head (11), and one end of the end cap (3) with an end plate (32) is close to the end face.

20. An assembly, characterized in that: The sleeve steel bar connection structure includes multiple sets as described in any one of claims 1-15, and also includes two precast components (9). The connection ends of the two precast components (9) are 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). The sleeve (12) connects the two corresponding steel bars (1).

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