Split sleeve, connection structure and assembly

Abstract

The utility model relates to a kind of split sleeve steel bar connecting structure, it includes two steel bars to be connected and a split sleeve;The end of steel bar is provided with enlarged head;Split sleeve includes more than two cylinder units being divided along sleeve axial direction and the tightening sleeve of hoop together cylinder unit;Cylinder unit mutually spliced form complete cylinder, enlarged head is buckled in cylinder, the port of sleeve after buckling is less than the size of enlarged head;Tightening sleeve is rotatably connected in the outer circumferential surface of cylinder, to thereby connect enlarged head in sleeve, realize the connection of two steel bars.The connecting structure is mechanical connection, compared with grouting connection is more reliable, and quality inspection can be carried out, as long as tightening sleeve is tightened, it proves that connection is effective.The structure is simple to operate, does not need special technology or equipment, just manual operation can be, not affected by weather and construction power and other factors, improve construction efficiency.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated buildings, and in particular to a split sleeve, a connecting structure, 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 invention is to provide a split-type rebar connecting sleeve and its connecting structure, which has the advantages of improving the connection strength between rebars and facilitating installation.

[0010] The above-mentioned utility model objective is achieved through the following technical solution: a split sleeve rebar connection structure, including two rebars to be connected and a split sleeve; the ends of the rebars are provided with enlarged heads; the split sleeve includes two or more cylindrical units divided along the sleeve axis and a tightening sleeve that clamps the cylindrical units together; the enlarged head is fastened in the cylindrical body, and the end of the sleeve after fastening is smaller than the size of the enlarged head; the tightening sleeve is rotatably engaged with the outer circumferential surface of the cylindrical body to prevent the tightening sleeve from falling off.

[0011] The present invention is further configured such that the tightening sleeve is a single sleeve fitted onto the middle part of the cylinder.

[0012] The present invention is further configured such that: there are two tightening sleeves, which are respectively fitted onto both ends of the cylinder.

[0013] The present invention is further configured such that: the outer wall of the cylinder is provided with protruding teeth, and the end of the tightening sleeve is provided with a groove and a clearance notch. The groove is provided along the circumference of the tightening sleeve, and the clearance notch is connected to the groove. After the protruding teeth extend into the clearance notch, the tightening sleeve is rotated, and the protruding teeth are engaged in the groove, so that the tightening sleeve cannot move axially relative to the cylinder.

[0014] The present invention is further configured such that: the outer wall of the cylinder is provided with an external thread, the inner surface of the tightening sleeve is provided with an internal thread, and the cylinder and the tightening sleeve are in a threaded rotational fit.

[0015] The present invention is further configured such that the external thread of the cylinder and the internal thread of the tightening sleeve are both multi-start threads.

[0016] The present invention is further configured such that: a number of slurry passage holes are provided on the threaded area of ​​the cylinder wall and / or on the tightening sleeve.

[0017] The present invention is further configured such that: the outer wall of the cylinder is provided with an external thread, and several sliding grooves are formed at the external thread, the direction of the sliding grooves being parallel to the axial direction of the sleeve; the inner wall of the tightening sleeve is provided with a protruding slider, the slider being able to slide along the sliding groove and be screwed into the thread groove of the external thread.

[0018] 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.

[0019] The present invention is further provided with: the outer wall of the cylinder and the circumferential direction of the tightening sleeve are provided with etched lines for observing the relative rotation angle between the two.

[0020] The present invention is further configured such that: the cylinder wall of the cylinder body is provided with a slurry outlet hole at the position of the slide groove, and the slider is recessed in the opposite position to the slurry outlet hole to form a slurry avoidance groove; the cementitious material can flow out from the slurry outlet hole, and the cementitious material in the slurry avoidance groove of the slider is screwed into the thread along with the slider and solidifies to bond and fix the slider to the cylinder body.

[0021] The present invention is further configured such that the outer wall of the sleeve is cylindrical.

[0022] The present invention is further configured such that: the outer wall of the cylinder near the openings at both ends is shaped like a frustum, and the tightening sleeve is configured as a matching frustum shape.

[0023] The present invention is further configured such that: the sleeve includes a constricted portion, the outer diameter of which is smaller than the diameter of the sleeve body.

[0024] The present invention is further configured such that the inner cavity of the sleeve near the port is an inclined surface, a straight surface, or an arc surface.

[0025] The present invention is further configured such that the inner cavity of the sleeve is configured to match the shape of the enlarged head.

[0026] The present invention is further configured such that: a partition plate is provided in the middle of the inner wall of the cylindrical unit, the partition plate is perpendicular to the axis of the sleeve, and after the cylindrical units are spliced, the partition plate divides the inner cavity of the cylindrical unit into two.

[0027] The present invention is further configured such that: the sleeve wall is provided with an expansion plug hole, and the expansion plug is inserted into the expansion plug hole to tighten the two steel bars.

[0028] The present invention is further configured such that: an annular anti-slip groove or anti-slip protrusion is provided on the inner wall of the cylindrical unit.

[0029] The present invention is further configured such that: the cylindrical unit includes a first cylindrical unit and a second cylindrical unit, and the joint of the cylindrical units is provided with matching positioning protrusions and positioning grooves, and the positioning protrusions on the first cylindrical unit can be engaged into the positioning grooves on the second cylindrical unit.

[0030] The present invention is further configured such that the positioning protrusion is tooth-shaped, trapezoidal, semi-circular, or L-shaped.

[0031] The present invention is further configured such that the outer periphery of the tightening sleeve is circular or hexagonal.

[0032] The present invention is further configured such that: the side wall of the cylinder unit is provided with a grout inlet hole for cement slurry to flow in.

[0033] The present invention is further configured such that: the inner wall of the cylindrical unit is coated with a cementitious material layer, and after the cylindrical unit is fastened together, the cementitious material layer wraps the reinforcing steel.

[0034] The present invention is further configured such that: the side wall of the cylinder unit is provided with a slurry outlet hole for the cementitious material layer to flow out.

[0035] The present invention is further configured such that the slurry outlet is a semi-circular hole located at the joint of the cylinder unit.

[0036] The present invention is further configured such that: the slurry outlet is located within the threaded range of the cylinder unit port; and an annular slurry extrusion groove is provided on the inner wall of the cylinder unit at the slurry outlet.

[0037] The present invention is further configured such that: the outer wall of the sleeve is recessed inward to form an annular groove, or the outer wall of the sleeve is provided with a stirrup through hole, the stirrup is wrapped around the annular groove or passes through the stirrup through hole, and multiple steel bar connecting devices are connected into a whole.

[0038] The present invention is further configured such that: the sleeve includes a cylindrical body and a reducing block, the reducing block is engaged with the inner wall of the cylindrical body unit, and the inner ring opening formed by multiple reducing blocks is smaller than the size of the enlarged head.

[0039] The present invention is further configured such that the outer wall of the variable diameter block and the inner wall of the cylindrical unit are threaded together.

[0040] The present invention is further configured such that the contact surfaces of the reducing block and the enlarging head are configured to match each other in shape.

[0041] The present invention is further configured such that: the joint of the variable diameter block is provided with a matching positioning protrusion and positioning groove, and the jointed variable diameter block can be rotated and pushed forward inside the cylinder.

[0042] The present invention is further configured such that: the outer end of the variable diameter block is provided with an operating part for screwing the variable diameter block into the cylinder body.

[0043] The present invention is further configured such that the outer wall of the variable diameter block and the inner wall of the cylindrical unit are respectively provided with matching engagement protrusions or engagement grooves.

[0044] The second objective of this utility model is to provide an assembly with the advantage of strong connection and good overall integrity between components after assembly. This utility model objective is achieved through the following technical solution: it includes multiple sets of sleeves and two prefabricated components, with two reinforcing bars respectively embedded within the two prefabricated components, and the sleeves located between the two prefabricated components.

[0045] The present invention is further configured such that concrete is poured into the gap between the two precast components.

[0046] In summary, the beneficial technical effects of this utility model are as follows:

[0047] The enlarged head of the rebar is held in place by a sleeve with a constricted end. A tightening sleeve is fitted around the outer circumference of the split sleeve to prevent it from spreading outwards. The tightening sleeve is connected to the sleeve via a threaded or rotating locking mechanism to prevent detachment. This mechanical connection is more reliable than grouting connections and allows for quality inspection; a tight tightening sleeve confirms a valid connection. The structure is simple to operate, requiring no specialized technology or equipment, and can be performed manually. It is unaffected by weather or power supply factors, thus improving construction efficiency.

[0048] The positioning protrusions and positioning grooves on the cylindrical unit facilitate the snap-fit ​​of the cylindrical unit and the thread alignment of the tightening sleeve, thus speeding up the installation process.

[0049] The coarse thread, groove, and slider design speed up the tightening operation and improve connection strength.

[0050] The sleeve is filled with plugs, expansion plugs and cementing materials to fill the gap between the two steel bars, so that the axial pressure of the two steel bars can be better transmitted and the connection effect of the sleeve is enhanced.

[0051] The grooves on the outer wall of the sleeve and the perforations for the stirrups allow the sleeve to be connected with stirrups, increasing the connection strength while reducing the impact on the thickness of the protective layer. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the connection structure between the split-type tightening sleeve and the reinforcing bar of this utility model;

[0053] Figure 2 This is a schematic diagram of the tightened state after the sleeve is connected to the reinforcing bar;

[0054] Figure 3 This is a schematic diagram of a split sleeve with a tapered end structure;

[0055] Figure 4 This is a schematic diagram of a split sleeve structure with an inclined inner cavity near the port.

[0056] Figure 5 This is a schematic diagram of a split sleeve structure with a straight inner cavity near the port.

[0057] Figure 6 This is a schematic diagram of a split sleeve structure with an arc-shaped inner cavity near the port.

[0058] Figure 7 This is a schematic diagram of a split sleeve structure with a frustum-shaped constriction.

[0059] Figure 8 This is a schematic diagram of a split sleeve structure with a straight cylindrical outer wall;

[0060] Figure 9 This is a schematic diagram of a steel reinforcement structure with an enlarged head and a simple hook.

[0061] Figure 10 This is a schematic diagram of a steel reinforcement structure with an enlarged head featuring multiple bends and hooks;

[0062] Figure 11 This is a schematic diagram of a steel reinforcement structure with an enlarged ring head;

[0063] Figure 12 This is a schematic diagram of a steel reinforcement structure with an enlarged rhomboid cross-section;

[0064] Figure 13 This is a schematic diagram of a steel reinforcement structure with a truncated cone shape near the side of the enlarged head close to the reinforcing bar;

[0065] Figure 14 This is a schematic diagram of a steel reinforcement structure with an enlarged hexagonal head;

[0066] Figure 15 This is a schematic diagram of a steel reinforcement structure with an enlarged rectangular cross-section;

[0067] Figure 16 This is a schematic diagram of the connection structure between the enlarged head and the inner cavity of the sleeve, which are matched by arc surfaces;

[0068] Figure 17 This is a schematic diagram of the connection structure between the enlarged head and the inner cavity of the sleeve, which are matched hexagonal shapes;

[0069] Figure 18 This is a schematic diagram of the connection structure where the enlarged heads abut against each other;

[0070] Figure 19 This is a schematic diagram of a steel bar connection where both ends of the enlarged head are frustum-shaped.

[0071] Figure 20 This is a schematic diagram of a cylindrical structure with partitions.

[0072] Figure 21 This is a schematic diagram of the cylinder structure where the positioning protrusion and positioning groove at the splicing point of the split sleeve match;

[0073] Figure 22 This is a schematic diagram of a cylindrical structure with positioning protrusions in the shape of helical teeth;

[0074] Figure 23 This is a schematic diagram of a cylindrical structure with trapezoidal positioning protrusions;

[0075] Figure 24 This is a schematic diagram of the cylinder assembly process with L-shaped positioning protrusions;

[0076] Figure 25 This is a schematic diagram of the overall structure of the sleeve with L-shaped positioning protrusions;

[0077] Figure 26 This is a schematic diagram of the connection structure where the sleeve and tightening sleeve have multiple coarse threads.

[0078] Figure 27 This is a schematic diagram of a sleeve structure with coarse threads on both the inner and outer walls;

[0079] Figure 28 This is a schematic diagram of a sleeve structure with coarse threads only at the port position;

[0080] Figure 29 This is a schematic diagram showing the connection between the groove on the sleeve and the slider on the tightening sleeve.

[0081] Figure 30 This is a schematic diagram showing the parallel relationship between the sliding groove on the cylinder wall and the axial direction of the sleeve.

[0082] Figure 31 This is a schematic diagram of the sliding groove structure located at the joint of the cylinder body;

[0083] Figure 32 This is a schematic diagram of a ring-shaped tightening sleeve structure with protrusions on the inner wall;

[0084] Figure 33 This is a schematic diagram of a ring-shaped tightening sleeve structure with protrusions on the inner wall;

[0085] Figure 34 This is a schematic diagram of a tapered annular tightening sleeve structure with protrusions on the inner wall;

[0086] Figure 35 This is a schematic diagram of the connection structure where the outer side of the cylinder is fully enclosed by a tightening sleeve;

[0087] Figure 36 This is a schematic diagram of the structure of the inner slider of the tightening sleeve matching the slide groove;

[0088] Figure 37 This is a schematic diagram of the connection structure between the sleeve port setting card interface and the tightening sleeve;

[0089] Figure 38 This is a schematic diagram of the connection structure where the coarse thread of the sleeve is set to be wider at the front and narrower at the back, and it mates with the tightening sleeve.

[0090] Figure 39 This is a schematic diagram of the structure with engraved lines on the end face of the tightening sleeve;

[0091] Figure 40 This is a schematic diagram of the structure with engraving lines set around the circumference of the tightening sleeve;

[0092] Figure 41 This is a schematic diagram of the structure with engraved lines on the circumference of the sleeve;

[0093] Figure 42 This is a schematic diagram of a structure where the slurry outlet is located at the joint of the cylinder unit;

[0094] Figure 43 This is a schematic diagram showing the positional relationship between the slurry outlet of the sleeve and the chute;

[0095] Figure 44 This is a schematic diagram of the structure of the tightening sleeve with a slurry-avoiding groove corresponding to the slurry outlet;

[0096] Figure 45 This is a schematic diagram of a circular tightening sleeve structure with anti-slip rotating grooves in the circumferential direction;

[0097] Figure 46 This is a schematic diagram of a hexagonal tightening sleeve structure in the circumferential direction;

[0098] Figure 47 This is a schematic diagram showing the connection status between the protruding teeth on the cylinder and the end groove and clearance notch of the tightening sleeve.

[0099] Figure 48 This is a schematic diagram of the connection structure between the cementitious material layer filling sleeve and the tightening sleeve and the steel reinforcement;

[0100] Figure 49 This is a schematic diagram of the sleeve installation process when using cementitious materials;

[0101] Figure 50 This is a schematic diagram of a sleeve structure with grout passage holes, grout squeezing grooves, and anti-slip protrusions;

[0102] Figure 51 It is a schematic diagram of the sleeve and reinforcing bars with grout passage holes, grout squeezing grooves and anti-slip protrusions, as well as the tightening sleeve connection structure;

[0103] Figure 52 This is a schematic diagram of the connection structure between the sleeve and the reinforcing steel of the intermediate partition plate;

[0104] Figure 53 This is a schematic diagram of the connection structure between the expansion plug and the overall structure;

[0105] Figure 54 This is a schematic diagram of the connection structure with grooves on the side wall of the sleeve;

[0106] Figure 55 This is a schematic diagram of the connection structure with perforated stirrups on the side wall of the sleeve;

[0107] Figure 56 This is a schematic diagram of the overall structure of the variable diameter block and the cylinder meshing together;

[0108] Figure 57 This is an exploded view of the connection structure with variable diameter blocks;

[0109] Figure 58 This is a schematic diagram of the pre-embedded steel bar connection structure within precast components;

[0110] Figure 59 This is a schematic diagram of the connection structure of a precast component with multiple embedded steel bars;

[0111] Figures 60-61 It is a structural schematic diagram of the assembly of multiple prefabricated components.

[0112] In the diagram, 1. Reinforcing bar; 12. Sleeve; 11. Enlarged head; 2. Cylinder body; 21. Cylinder body unit; 211. Positioning protrusion; 212. Positioning groove; 22. Expansion plug hole; 23. Groove; 24. Stirrup through hole; 25. Closing part; 251. Grouting hole; 252. Grouting groove; 26. Locking interface; 27. Anti-slip protrusion; 28. Anti-slip rotating groove; 29. ​​Slide groove; 202. Grout outlet hole; 31. Tightening sleeve; 312. Sliding block; 313. Grating line; 314. Grout avoidance groove; 32. Convex tooth; 33. Locking groove; 34. Relief notch; 35. Expansion plug; 41. Divider plate; 42. Coarse thread; 43. Thread groove; 5. Cementitious material layer; 6. Variable diameter block; 61. Operating part; 7. Stirrup; 9. Precast component. Detailed Implementation

[0113] The present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0114] like Figure 1 As shown, this utility model discloses a split-type rebar connecting sleeve and its connecting structure. The connecting structure includes two rebars 1 to be connected and a split-type sleeve 12. The ends of the rebars 1 are provided with enlarged heads 11. Combined with... Figure 2 and Figure 3 The split sleeve 12 includes two or more cylindrical units 21 divided along the axial direction of the sleeve 12, and two tightening sleeves 31 that clamp the cylindrical units 21 together. The tightening sleeves 31 are respectively located at both ends of the sleeve 12. The tightening sleeves 31 are rotatably engaged with the outer circumferential surface of the sleeve 12, such as... Figure 1As shown, the inner wall of the tightening sleeve 31 is provided with an internal thread, and the outer side of the sleeve 12 is provided with an external thread, and the two are connected by threads.

[0115] Taking the two-lobed cylindrical unit 21 as an example, the operation process is as follows: First, the tightening sleeve 31 is placed on the reinforcing bar 1, then the two reinforcing bars 1 are aligned head to head, and the two cylindrical units 21 are fastened to the two enlarged heads 11 from both sides of the reinforcing bars 1; finally, the tightening sleeve 31 is rotated and tightened on the outside of the cylindrical unit 2.

[0116] Principle Analysis: The enlarged head 11 of the reinforcing bar 1 is fastened inside the cylinder 2. The end of the sleeve 12 after fastening is smaller than the size of the enlarged head 11. The enlarged head 11 of the reinforcing bar 1 is held in place by the sleeve 12 with a constricted opening. After the separate sleeve 12 is fitted with a tightening sleeve 31 on its outer periphery, it prevents the separate sleeve 12 unit from spreading outwards. The tightening sleeve 31 is threaded onto the sleeve 12 to prevent it from falling off, thereby realizing the connection of the two reinforcing bars 1.

[0117] This mechanical connection structure is more reliable than grouting connections and allows for quality inspection; simply tightening sleeve 31 confirms the connection's effectiveness. The structure is simple to operate, requiring no specialized techniques or equipment, and can be performed manually. It is unaffected by weather or power supply factors, thus improving construction efficiency.

[0118] like Figure 1 As shown, in order to ensure that the reinforcing bar 1 has good tensile and compressive strength, the inner cavity of the sleeve 12 is designed to match the shape of the enlarged head 11.

[0119] like Figures 3-6 As shown, the sleeve 12 includes a constricted portion 25, the outer diameter of which is smaller than the diameter of the cylinder 2, and a tightening sleeve 31 is fitted onto the constricted portion 25. The inner cavity of the sleeve 12 near the port can be a sloped surface, a straight surface, or an arc surface.

[0120] like Figure 7 As shown, the outer wall of the cylinder 2 near the openings at both ends can also be set in a frustum shape, and the tightening sleeve 31 is set in a matching frustum shape.

[0121] like Figure 8 As shown, the outer wall of the sleeve 12 can also be cylindrical, as long as the inner cavity of the sleeve 12 is provided with a shape that can engage the enlarged head 11.

[0122] like Figure 9-15 As shown, the enlarged head 11 of the reinforcing bar 1 can be a simple hook or multiple hooks 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 engaged by the inner cavity of the sleeve 12.

[0123] like Figure 16-19As shown, the enlarged head 11 of the reinforcing bar 1 is engaged in the sleeve 12, which not only achieves tensile strength, but also achieves axial pressure transmission because the two enlarged heads 11 abut against each other, or the enlarged head 11 abuts against the inner wall of the middle of the cylinder 2.

[0124] like Figure 20 and Figure 52 As shown, a partition plate 41 is provided in the middle of the inner wall of the cylindrical unit 21. The partition plate 41 is perpendicular to the axis of the sleeve 12. After the cylindrical unit 21 is spliced, the partition plate 41 divides the inner cavity of the cylindrical unit 2 into two, thereby achieving better centering.

[0125] Since the two cylindrical units 21 need to be joined and their ends aligned before the tightening sleeve 31 is installed, a positioning structure is provided at the joint of the two cylindrical units 21 to facilitate the alignment operation. Specifically, as follows: Figure 8 and Figure 21 As shown, the cylindrical unit 21 includes a first cylindrical unit 213 and a second cylindrical unit 214. The joint of the cylindrical units 21 is provided with integrally formed matching positioning protrusions 211 and positioning grooves 212. The positioning protrusions 211 on the first cylindrical unit 213 can engage with the positioning grooves 212 on the second cylindrical unit 214. As shown, the positioning protrusions 211 can be toothed, and the positioning grooves 212 have a matching shape. Figure 22 As shown, the protrusion can also be a helical tooth. During installation, simply fasten the two cylindrical units 21 together, and the protrusion will naturally embed into the positioning groove 212, thus achieving flush alignment of the ends of the sleeve 12 and facilitating the installation of the tightening sleeve 31.

[0126] The protrusions of the above shape can only restrict the axial movement of the cylindrical unit 21. Therefore, further, as... Figure 23 As shown, the protrusion is trapezoidal. During installation, after the two cylindrical units 21 are aligned, they are radially misaligned in the sleeve 12. Then, the trapezoidal protrusion is inserted into the positioning groove 212. This not only restricts the axial movement of the cylindrical units 21 relative to each other but also prevents the two cylindrical units 21 from separating radially, thereby further improving installation efficiency. Similarly, the protrusion 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 protrusion into the positioning groove 212. The second step is to move one cylindrical unit 21 axially so that the protrusion of the L-shape hooks into the corresponding part of the positioning groove 212, thereby preventing the two cylindrical units 21 from separating radially (see...). Figure 25 ). Example 2

[0127] The difference from Example 1 is that the rotational snap-fit ​​method between the tightening sleeve 31 and the cylinder 2 is different.

[0128] like Figure 26As shown, the external thread of the sleeve 12 and the internal thread of the tightening sleeve 31 are both coarse threads 42, which can be multi-start threads.

[0129] Since the threaded fit only serves to fix the tightening sleeve 31 to the cylinder 2, therefore, as Figure 26 As shown, the external thread of the sleeve 12 and the internal thread of the tightening sleeve 31 are both coarse threads 42. This configuration, compared to conventional fine threads, can speed up the installation process.

[0130] like Figure 27 As shown, the cylinder wall of the cylinder 2 can be configured with coarse threads 42 with corresponding internal and external concave and convex shapes along its entire length to facilitate the machining of the sleeve 12. Alternatively, it can be as follows... Figure 28 As shown, coarse threads 42 are only provided near the two ends of the cylinder 2, and the middle section is a thickened cylinder wall. This structure can save materials while ensuring the connection effect.

[0131] Furthermore, to improve the assembly efficiency of the tightening sleeve 31 and the cylinder 2, a quick-release nut structure is provided. (See reference) Figure 29 and Figure 30 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 31 As shown, the groove 29 can be positioned at the joint between two cylindrical units 21. Figures 32-35 As shown, the inner wall of the tightening sleeve 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 32 As shown, the tightening sleeve 31 can be a ring, such as... Figure 33 As shown, the tightening sleeve 31 is a ring with a certain width, or it can be as follows: Figure 34 The conical ring shown. (As shown in the image) Figure 35 As shown, the tightening sleeve 31 can also be designed to completely surround the outside of the cylinder 2. After the two tightening sleeves 31 are installed, they will wrap around the entire cylinder 2. In addition, the tightening sleeve 31 can be a single piece, not set at both ends, but directly fitted onto the middle of the cylinder 2.

[0132] Better, such as Figure 36 As shown, the shape and size of the slider 312 of the tightening sleeve 31 match the groove 29.

[0133] Better, such as Figure 37As shown, the cylinder 2 is a straight cylinder. The inner wall of the cylinder 2 is recessed at the port to form a snap-fit ​​interface 26 for engaging the enlarged head 11. A threaded groove 43 is formed on the outer wall of the cylinder 2 within the range of the snap-fit ​​interface 26. The tightening sleeve 31 is an annular shape with a certain width, and a slider 312 is set at one end near the port. This design can reduce the number of threads, and since the tightening sleeve 31 can be first fitted onto the cylinder 2 for initial positioning during installation, and then the slider 312 is slid into the groove 29, the installation is more convenient than directly aligning the slider 312 with the groove 29.

[0134] like Figure 38 As shown, furthermore, the screw-out end of the threaded groove 43 is closed or narrowed to prevent the slider 312 from being screwed into the slide groove 29. For example, the width of the threaded groove 43 between the two slide grooves 29 along the screw-in direction of the slider 312 is wider at first and then narrower to prevent the slider 312 from being screwed into another slide groove 29. Preferably, the slider 312 is also configured as a matching wedge structure.

[0135] like Figure 39 and Figure 40 As shown, the end face and circumferential surface of the tightening sleeve 31 are provided with engraving lines 313, such as... Figure 41 As shown, the sleeve 12 has circumferential graduations 313. When the slider 312 slides along the groove 29, the initial graduation of the tightening sleeve 31 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.

[0136] Preferably, such as Figure 42 and Figure 43 As shown, the sleeve 12 has a slurry outlet 202 located at the position of the groove 29 on its cylinder wall, which can be set at the joint of two cylinder units 21. Figure 44 As shown, the slider 312 is recessed relative to the slurry outlet 202 to form a slurry-avoiding groove 314. When a cementing material is placed inside the cylinder 2, the cementing material can flow out from the slurry outlet 202 when the sleeve 12 is engaged with the enlarged head 11. During the advancement of the slider 312, the cementing material in the slurry-avoiding groove 314 is retained, while the cementing material in other areas is scraped away. When the slider 312 is screwed into the threaded groove 43, the cementing material in the slurry-avoiding groove 314 of the slider 312 is screwed into the threaded groove 43 along with the slider 312. After this portion of the cementing material solidifies, it bonds and fixes the slider 312 to the sleeve 12. This prevents the connection from failing after the tightening sleeve 31 rotates.

[0137] like Figures 45-46 As shown, the outer periphery of the tightening sleeve 31 is circular or hexagonal to facilitate screwing and rotating operations, and multiple anti-slip rotating grooves 28 can also be provided on the outer periphery. Example 3

[0138] The difference from Embodiment 2 lies in the connection method between the tightening sleeve 31 and the cylinder 2. For example... Figure 47 As shown, the outer wall of the cylinder 2 is provided with protruding teeth 32, and the end of the tightening sleeve 31 is provided with a groove 33 and a clearance notch 34. The groove 33 is arranged circumferentially along the tightening sleeve 31, and the clearance notch 34 communicates with the groove 33. After the protruding teeth 32 extend into the clearance notch 34, the tightening sleeve 31 is rotated, and the protruding teeth 32 are engaged in the groove 33, preventing the tightening sleeve 31 from moving axially relative to the cylinder 2. This structure achieves the same effect as a quick-release nut, and can also realize the quick installation of the tightening sleeve 31. Example 4

[0139] The difference from the above embodiments is as follows: Figure 48 As shown, the inner wall of the cylindrical unit 21 is coated with a cementitious material layer 5. After the cylindrical unit 21 is fastened, the cementitious material layer 5 wraps around the reinforcing bar 1. The cementitious material can fill the gap between the reinforcing bar 1 and the inner cavity of the sleeve 12, making the two fit more tightly. The cementitious material can be an inorganic grout such as cement-based mortar concrete, or an organic cementitious material such as epoxy resin adhesive or chemical adhesive.

[0140] Since the inner cavity of the sleeve 12 is machined to be identical to the enlarged head 11 of the reinforcing bar 1, the positional requirements for both the sleeve 12 and the reinforcing bar 1 are relatively high during installation. Installation is also more convenient when the reinforcing bar 1 can move freely. However, for reference... Figure 48 and Figure 58 When two reinforcing bars 1 are embedded in a precast component 9, such as a precast floor slab, a gap often remains between the enlarged ends 11 of the two reinforcing bars 1 after the precast floor slab is positioned during installation. In this case, the sleeve 12, whose shape is perfectly matched, cannot be installed. Therefore, as... Figure 48 As shown, the length and width of the inner cavity of the sleeve 12 are both greater than the dimensions of the two enlarged heads 11, thus solving the aforementioned technical problem. Since the cementitious material fills the gap between the two enlarged heads 11, the transmission of axial pressure between the two reinforcing bars 1 is satisfied.

[0141] like Figure 49 As shown, the installation steps of sleeve 12 are as follows: First, put the two tightening sleeves 31 on the two steel bars 1 respectively, and at the same time, apply adhesive material into the inner cavity of the cylinder unit 21; fasten the two cylinder units 21 on both sides of the steel bars 1, and the excess adhesive material overflows from the port and splice of the cylinder 2; put the tightening sleeves 31 on both ends of the cylinder unit 21, and tighten them to complete the connection of the steel bars 1.

[0142] Looking back Figure 8The side wall of the cylindrical unit 21 is provided with a slurry outlet 202 for the cementitious material layer 5 to flow out. Preferably, the slurry outlet 202 is a semi-circular hole located at the joint of the cylindrical unit 21. During installation, as the two cylindrical units 21 approach each other, the joint becomes narrower and the outflow rate of the cementitious material slows down. The slurry outlet 202 located at the joint can better guide the slurry out, thereby improving the jointing efficiency.

[0143] like Figure 50 and 51 As shown, the grout passage hole 251 is located within the threaded area of ​​the port of the cylinder unit 21, facilitating the overflow of cementitious material from the grout passage hole 251 into the thread, thereby facilitating the bonding and fixing of the quick nut in Embodiment 2. Furthermore, an annular grout squeezing groove 252 is provided on the inner wall of the cylinder unit 21 at the grout passage hole 251, which allows the cementitious material to be discharged more effectively from the grout passage hole 251.

[0144] In order to increase the bonding and friction between the cementing material and the inner wall of the cylinder unit 21, annular anti-slip grooves or anti-slip protrusions 27 are provided on the inner wall of the cylinder unit 21. The figure shows the anti-slip protrusions 27. Example 5

[0145] The difference from Example 4 is that: Figure 53 As shown, when the two reinforcing bars 1 cannot move freely and there is a gap between the enlarged heads 11 of the two reinforcing bars 1, in addition to filling with cementitious material, an expansion plug hole 22 can be opened in the sleeve 12. After the expansion plug 35 is inserted into the expansion plug hole 22, it fills the gap between the two enlarged heads 11, thereby realizing the transmission of axial pressure between the two reinforcing bars 1. Example 6

[0146] like Figure 54 and 55 As shown, the outer wall of the cylinder is recessed inward to form an annular groove 23, or the outer wall of the sleeve 12 has a stirrup through hole 24. The stirrup 7 is wrapped around the annular groove 23 or passes through the stirrup through hole 24, connecting multiple steel bar 1 connecting devices into a whole. Figure 59As shown, when the precast component 9 is a vertical component, such as a precast wall, a double layer of reinforcing bars 1 is generally installed inside the wall, and the embedded sleeve 12 is also correspondingly double-layered. However, since the outer diameter of the sleeve 12 is larger than the diameter of the reinforcing bar 1, the thickness of the concrete protective layer between the outer wall of the sleeve 12 and the outer surface of the vertical component 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 protective layer of the reinforcing bar 1 is 35mm, the protective layer at the sleeve 12 is only 23mm. Since, under normal circumstances, the ends of multiple reinforcing bars 1 are connected and reinforced with stirrups 7, if the stirrups 7 are placed outside the sleeve 12, the protective layer will be significantly insufficient, which will affect the quality of the component. Therefore, the stirrups 7 can be installed in the groove 23 or pass through the stirrup hole 24 to overcome the problem of insufficient protective layer. Example 7

[0147] The difference from Example 1 is that: Figure 56 and 57 As shown, the sleeve 12 includes a cylindrical body 2 and a reducing block 6. The reducing block 6 is engaged with the inner wall of the cylindrical body unit 21. There can be two reducing blocks 6, and the inner ring opening formed by the two reducing blocks 6 is smaller than the size of the enlarged head 11. During installation, first, the tightening sleeve 31 is placed on the reinforcing bar 1; then, the two reinforcing bars 1 with enlarged heads 11 are axially aligned; the reducing block 6 is engaged with the inner wall of the cylindrical body unit 21; the cylindrical body unit 21 with reducing blocks 6 is fastened to the positions of the two enlarged heads 11; after the tightening sleeve 31 is placed on the outer circumference of the cylindrical body 2, the tightening sleeve 31 is rotated. After installation, the enlarged head 11 is engaged in the sleeve 12 by the reducing block 6, thereby realizing the connection of the reinforcing bars 1.

[0148] The engagement of the reducing block 6 with the inner wall of the cylindrical unit 21 can be achieved by providing matching engagement protrusions and engagement grooves 23 on the assembly surfaces of the outer wall of the reducing block 6 and the inner wall of the cylindrical unit 21, respectively. Alternatively, as shown in the figure, the outer wall of the reducing block 6 and the inner wall of the cylindrical unit 21 can be threaded together. After threading, the reducing block 6 can be further tightened inside the cylindrical unit 2, thereby pressing it against the enlarged head 11 and pushing the enlarged head 11 deep into the sleeve 12.

[0149] To facilitate the rotation and advancement of the assembled reducing block 6 within the cylinder 2, matching positioning protrusions 211 and positioning grooves 212 (not shown in the figure, but refer to the assembly positioning structure of the cylinder unit 21) are provided at the joint of the two reducing blocks 6. Additionally, an operating part 61 for screwing the reducing block 6 into the cylinder 2 can be provided at the outer end of the reducing block 6. The reducing block protrudes from the end of the sleeve 12, and the exposed part is the operating part 61. The outer circumference of the operating part 61 can be hexagonal as shown in the figure, facilitating the engagement and rotation of a wrench or caliper. The operating part 61 can also be a slot or hole opened on the end face. Furthermore, the contact surface between the reducing block 6 and the enlarged head 11 is set with a matching shape, such as an inclined surface or an arc surface. Example 8

[0150] An assembly, such as Figure 58 As shown, the assembly includes two precast components 9, with two reinforcing bars 1 embedded within each component 9. The connecting ends of the two reinforcing bars 1 extend beyond the end faces of the precast components 9. A sleeve 12 is located between the two precast components 9. The two reinforcing bars 1 are inserted into the sleeve 12 to form an assembly. Furthermore, concrete is poured into the gap between the two precast components 9. Figure 59 As shown, each precast component 9 has multiple pre-embedded connecting steel bars 1. The positions of the steel bars 1 on different components correspond and are connected by sleeves 12. Figure 60 and 61 As shown, the precast component 9 can be two horizontal components and two vertical components. All the reinforcing bars 1 are connected by sleeves 12, and the connection positions are all set in the post-cast strip. Example 9

[0151] A method for connecting reinforcing bars and sleeves includes the following construction steps:

[0152] Install the tightening sleeve 31: Put the tightening sleeve 31 onto the reinforcing bar 1;

[0153] Alignment of Reinforcing Bar 1: The two reinforcing bars 1 with enlarged heads 11 are axially aligned.

[0154] Install sleeve 12: Fasten the cylinder unit 21 onto the two enlarged heads 11;

[0155] Installation of tightening sleeve 31: After putting the tightening sleeve 31 on the outer circumference of the cylinder 2, rotate the tightening sleeve 31 so that the sleeve 12 clamps the enlarged head 11.

[0156] Install expansion bolts: The sleeve 12 has an expansion plug hole 22 on its wall. Insert the expansion plug 35 into the sleeve 12 through the expansion plug hole 22 to tighten the two steel bars 1.

[0157] Example 10:

[0158] A method for connecting reinforcing bars and sleeves includes the following construction steps:

[0159] Install the tightening sleeve 31: Put the tightening sleeve 31 onto the reinforcing bar 1;

[0160] Alignment of Reinforcing Bar 1: The two reinforcing bars 1 with enlarged heads 11 are axially aligned.

[0161] Apply cementitious material inside sleeve 12: Apply cementitious material into the inner cavity of cylinder unit 21;

[0162] Install sleeve 12: Fasten the cylinder unit 21 onto the two enlarged heads 11;

[0163] Installation of tightening sleeve 31: After the tightening sleeve 31 is placed on the outer circumference of the cylinder 2, the tightening sleeve 31 is rotated so that the sleeve 12 clamps the enlarged head 11, and the adhesive material fills the gap between the connecting steel bar 1 and the sleeve 12.

[0164] Example 11:

[0165] A method for connecting reinforcing bars and sleeves includes the following construction steps:

[0166] Install the tightening sleeve 31: Put the tightening sleeve 31 onto the reinforcing bar 1;

[0167] Alignment of Reinforcing Bar 1: The two reinforcing bars 1 with enlarged heads 11 are axially aligned.

[0168] Install the plug: Insert the plug or expansion plug 35 between the two enlarged heads 11;

[0169] Install sleeve 12: Fasten the cylinder unit 21 onto the two enlarged heads 11;

[0170] Installation of tightening sleeve 31: After putting the tightening sleeve 31 on the outer circumference of the cylinder 2, rotate the tightening sleeve 31 so that the sleeve 12 clamps the enlarged head 11.

[0171] Example 11:

[0172] A method for connecting reinforcing bars and sleeves includes the following construction steps:

[0173] Install the tightening sleeve 31: Put the tightening sleeve 31 onto the reinforcing bar 1;

[0174] Alignment of Reinforcing Bar 1: The two reinforcing bars 1 with enlarged heads 11 are axially aligned.

[0175] Install the sleeve 12 with the reducing block 6: The sleeve 12 includes a cylinder 2 and a reducing block 6. The reducing block is threadedly engaged with the inner wall of the cylinder unit 21. The reducing block 6 is threadedly engaged with the cylinder unit 21.

[0176] Installation of tightening sleeve 31: After putting the tightening sleeve 31 on the outer circumference of the cylinder 2, rotate the tightening sleeve 31;

[0177] Tighten the reducing block 6: Tighten the reducing block 6 so that it is pressed against the enlarged head 11.

[0178] Install expansion bolts: Insert the tip of the wedge-shaped expansion bolt through the expansion bolt holes on both sides of the sleeve 12 into the sleeve 12 to tighten the two steel bars 1.

[0179] Example 12:

[0180] A method for connecting reinforcing bars and sleeves includes the following construction steps:

[0181] Install the tightening sleeve 31: Put the tightening sleeve 31 onto the reinforcing bar 1;

[0182] Alignment of Reinforcing Bar 1: The two reinforcing bars 1 with enlarged heads 11 are axially aligned.

[0183] Install the plug: Insert the plug or expansion plug 35 between the two enlarged heads 11;

[0184] Install the sleeve 12 with the reducing block 6: The sleeve 12 includes a cylinder 2 and a reducing block 6. The reducing block is threadedly engaged with the inner wall of the cylinder unit 21. The reducing block 6 is threadedly engaged with the cylinder unit 21.

[0185] Installation of tightening sleeve 31: After putting the tightening sleeve 31 on the outer circumference of the cylinder 2, rotate the tightening sleeve 31;

[0186] Tighten the reducing block 6: Tighten the reducing block 6 so that it is pressed against the enlarged head 11.

[0187] Install expansion bolts: Insert the tip of the wedge-shaped expansion bolt through the expansion bolt holes on both sides of the sleeve 12 into the sleeve 12 to tighten the two steel bars 1.

[0188] 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 split-type sleeve steel bar connection structure, characterized in that: It includes two reinforcing bars (1) to be connected and a split sleeve (12); the ends of the reinforcing bars (1) are provided with enlarged heads (11); the split sleeve (12) includes two or more cylindrical units (21) divided along the axial direction of the sleeve (12) and a tightening sleeve (31) that clamps the cylindrical units (21) together; the enlarged head (11) is fastened inside the cylindrical unit (2), and the end of the sleeve (12) after fastening is smaller than the size of the enlarged head (11); the tightening sleeve (31) is rotatably snapped into the cylindrical unit (2). The outer circumferential surface is protected to prevent the tightening sleeve (31) from falling off; the outer wall of the cylinder (2) is provided with protruding teeth (32), and the end of the tightening sleeve (31) is provided with a groove (33) and a relief notch (34). The groove (33) is provided along the circumference of the tightening sleeve (31), and the relief notch (34) is connected to the groove (33). After the protruding teeth (32) extend into the relief notch (34), the tightening sleeve (31) is rotated, and the protruding teeth (32) are inserted into the groove (33), so that the tightening sleeve (31) cannot move axially relative to the cylinder (2).

2. The split-type sleeve steel bar connection structure according to claim 1, characterized in that: The tightening sleeve (31) is a single piece, fitted onto the middle part of the cylinder (2).

3. The split-type sleeve steel bar connection structure according to claim 1, characterized in that: There are two tightening sleeves (31), which are respectively fitted onto both ends of the cylinder (2).

4. The split-type sleeve steel bar connection structure according to claim 1, characterized in that: The outer wall of the cylinder (2) is provided with an external thread, and several grooves (29) are provided at the external thread. The direction of the grooves (29) is parallel to the axis of the sleeve (12). The inner wall of the tightening sleeve (31) is provided with a protruding slider (312). The slider (312) can slide along the groove (29) and be screwed into the thread groove (43) of the external thread.

5. The split-type sleeve steel bar connection structure according to claim 1, characterized in that: The outer wall of the sleeve (12) is cylindrical.

6. The split-type sleeve steel bar connection structure according to claim 1, characterized in that: The cylindrical unit (21) includes a first cylindrical unit (21) and a second cylindrical unit (21). The joint of the cylindrical unit (21) is provided with matching positioning protrusions (211) and positioning grooves (212). The positioning protrusions (211) on the first cylindrical unit (21) can be inserted into the positioning grooves (212) on the second cylindrical unit (21).

7. The split-type sleeve steel bar connection structure according to claim 1, characterized in that: The sleeve (12) includes a cylinder (2) and a reducing block (6). The reducing block (6) is engaged with the inner wall of the cylinder unit (21). The inner ring opening formed by multiple reducing blocks (6) is smaller than the size of the enlarged head (11).

8. A split sleeve (12) as described in any one of claims 1-7.

9. An assembly, characterized in that: It includes multiple sets of split sleeves (12) as described in any one of claims 1-7, and also includes two prefabricated components (9), wherein the two reinforcing bars (1) are respectively embedded in the two prefabricated components (9), and the sleeve (12) is located between the two prefabricated components (9).

Images