A sleeve connection structure with expansion device and sleeve

Abstract

The present invention discloses a sleeve connection structure with an expansion device and a sleeve, and relates to the field of prefabricated buildings. The technical solution thereof comprises a sleeve and two steel bars to be connected, the sleeve comprising a cylinder body and ports at both ends, the ends of the steel bars are provided with enlarged heads, and one end of the two steel bars with the enlarged heads is clamped in the cylinder body; an expansion device is arranged between the two enlarged heads or between the enlarged head and the port, and the expansion device fills the gap between the two enlarged heads or between the enlarged head and the two ports. The advantage of the present invention is that the gap between the two enlarged heads or between the enlarged head and the two ports is filled, thereby improving the connection strength between the steel bars and the sleeve.

Description

Technical Field

[0001] The invention relates to the field of assembled buildings, and in particular to a sleeve connection structure with an expansion device and a sleeve. Background Art

[0002] The patent application document submitted by the applicant on July 21st records a shrinking steel sleeve and assembly structure (application number 201821160954.9), see Fig.30 The sleeve 1 is a split-flap sleeve 1, which includes a cylindrical unit 13 that is split and arranged along the axial direction of the connecting sleeve 1. An opening is arranged on one side of the cylindrical unit 13. The side of the cylindrical unit 13 close to the opening can be mutually buckled to put one end of two steel bars 2 with enlarged heads 21 inside the cylindrical unit 13. After the cylindrical unit 13 is buckled, a fixing ring 14 is sleeved on the outer surface of the sleeve 1 to connect the multi-flap cylindrical unit 13 into a whole. Since the enlarged head 21 is buckled in the sleeve 1, the connection of the two steel bars 2 is realized, which plays a role in resisting tension.

[0003] During on-site construction, most of the steel bars 2 are embedded in the prefabricated components 15. Since the prefabricated components 15 are not convenient to move again after hoisting, the gap between the enlarged heads 21 of two steel bars 2 on different prefabricated components 15 is inconvenient to adjust. The gap between the enlarged heads 21 of the two steel bars 2 engaged in the sleeve 1 will affect the axial compressive strength of the connection structure formed by the steel bars 2 and the sleeve 1. At the same time, the gap between the ends of the steel bars 2 and the sleeve 1 affects the axial tensile strength of the connection structure formed by the steel bars 2 and the sleeve 1.

[0004] The patent application document submitted by the applicant on April 8th describes a shrinking steel bar 2 connection sleeve 1 and its connection structure (application number 201820488633.5), see Fig.29 It includes a cylinder and a connecting steel bar 2. A grouting hole is opened on the cylinder. Both ends of the sleeve 1 are fixedly connected with a shrinkage. The end of the connecting steel bar 2 is fixedly connected with an enlarged head 21, and the enlarged head 21 can be inserted into the cylinder through the shrinkage. Concrete is poured into the grouting hole of the sleeve 1, and the concrete slurry fills the gap between the enlarged head 21 and the shrinkage, solidifying the steel bar 2 in the sleeve 1 to prevent the steel bar 2 from being pulled out of the sleeve 1.

[0005] Since the concrete fills the gap between the shrinkage and the enlarged head 21 of the steel bar 2, the steel bar 2 is prevented from being pulled out of the sleeve 1. However, concrete is easily crushed, and if the tension between the enlarged head 21 of the steel bar 2 and the shrinkage is large enough, the enlarged head 21 of the steel bar 2 tends to be separated from the sleeve 1, thereby making the connection between the steel bar 2 and the sleeve 1 invalid.

[0006] In summary, the sleeve 1 connection structure is used in prefabricated buildings. Due to the gap between the two enlarged heads 21 or between the enlarged head 21 and the two ports of the sleeve 1, the sleeve 1 connection structure is insufficient in axial tensile and compressive resistance. Summary of the invention

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a sleeve connection structure with an expansion device, which has the advantage of filling the gap between the two enlarged heads or between the enlarged head and the two ports, thereby improving the connection strength between the steel bar and the sleeve.

[0008] The above-mentioned purpose of the present invention is achieved through the following technical scheme: it includes a sleeve and two steel bars to be connected, the sleeve includes a cylinder body and two end ports, the ends of the steel bars are provided with enlarged heads, and one end of the two steel bars with the enlarged heads is clamped in the cylinder body; a tightening device is provided between the two enlarged heads or between the enlarged head and the port, and the tightening device fills the gap between the two enlarged heads or between the enlarged head and the two ports.

[0009] Through the above technical solution, the expansion device fills the gap between the two enlarged heads or the enlarged heads and the two ports, thereby improving the connection strength between the steel bar and the sleeve.

[0010] The present invention is further configured as follows: the cylinder is a petal structure, the port of the cylinder is retracted inward to form a closed opening, the closed opening is a flat opening, and the enlarged head of the steel bar end is larger than the flat opening.

[0011] Through the above technical solution, the steel bars are buckled in the cylinder through the petal structure of the cylinder.

[0012] The present invention is further configured as follows: a plurality of pairs of middle wedge-shaped expansion plugs are arranged between the two steel bar enlarged heads, a through hole for the middle wedge-shaped expansion plug to pass through is opened in the middle of the cylinder, and the middle wedge-shaped expansion plug passes through the through hole and is inserted between the two steel bar enlarged heads.

[0013] Through the above technical solution, the middle wedge-shaped expansion plug can be inserted from the through hole after the split sleeve is buckled, so as to achieve the expansion effect, which is more convenient to operate. The inserted middle wedge-shaped expansion plug expands and tightens, thereby improving the axial pressure bearing capacity of the sleeve and the steel bar, and further improving the connection strength of the sleeve and the steel bar.

[0014] The present invention is further configured as follows: a plurality of pairs of middle wedge-shaped expansion plugs are arranged between the two steel bar enlarged heads, and the middle wedge-shaped expansion plugs and the steel bar enlarged heads are buckled together in the cylinder.

[0015] Through the above technical scheme, during construction, first select the middle wedge-shaped expansion plug which is slightly thicker than the gap between the enlarged heads, and squeeze the middle wedge-shaped expansion plug in its length direction through the snap-fit ​​connection of the split cylinder. The middle wedge-shaped expansion plug converts the extrusion force it receives into a tightening force in the length direction of the steel bar, thereby improving the axial compressive capacity of the sleeve and the steel bar, and further improving the connection strength between the sleeve and the steel bar.

[0016] The present invention is further configured as follows: a plurality of middle flat washers are arranged between the two steel bar enlarged heads, and the middle flat washers are between the middle wedge-shaped expansion plug and the steel bar enlarged head.

[0017] Through the above technical solution, the middle flat washer fine-tunes the gap between the steel bar enlarged head and the middle wedge-shaped expansion plug, further improving the connection strength between the steel bar and the sleeve.

[0018] The present invention is further configured as follows: a plurality of pairs of end wedge-shaped expansion plugs are arranged between the flat opening and the enlarged head of the steel bar, and the end wedge-shaped expansion plugs are provided with a first notch for avoiding the steel bar.

[0019] Through the above technical solution, the end wedge-shaped expansion plug expands and tightens the flat mouth and the enlarged head of the steel bar, thereby improving the connection strength between the steel bar and the sleeve; the setting of the first notch makes it easier for the end wedge-shaped expansion plug to avoid the steel bar during the insertion process.

[0020] The present invention is further configured as follows: a plurality of end flat washers are arranged between the flat opening and the enlarged head of the steel bar, and the end flat washers are provided with second notches for avoiding the steel bars.

[0021] Through the above technical solution, the end flat washer can fine-tune the tiny gap between the flat mouth and the enlarged head of the steel bar, thereby improving the connection strength between the steel bar and the sleeve; the setting of the second notch facilitates avoiding the steel bar during the placement of the end flat washer.

[0022] The present invention is further configured as follows: the middle wedge-shaped expansion plug or the end wedge-shaped expansion plug is provided with a clamping bolt, and the clamping bolt passes through the cylinder wall and abuts against the middle wedge-shaped expansion plug or the end wedge-shaped expansion plug.

[0023] Through the above technical solution, the tightening bolt will further tighten the middle wedge-shaped expansion plug or the end wedge-shaped expansion plug abutting against it.

[0024] The present invention is further configured as follows: a tensioning bolt is arranged between the two steel bar enlarged heads, the tensioning bolt includes a cylinder and two blocks at the ends of the cylinder, and also includes a tensioning screw; the side wall of the cylinder is fixedly connected to the middle part of the cylinder body, the tensioning screw passes through the cylinder and enters the middle of the two blocks, the two blocks are inclined to both sides and abut against the steel bar enlarged heads.

[0025] Through the above technical solution, the bolt is screwed, the bolt pushes the two clamping blocks apart, and the two sides of the clamping blocks are tilted to expand and tighten the two steel bar enlarged heads, thereby improving the connection strength between the steel bar and the sleeve.

[0026] The present invention is further configured as follows: the steel bar enlarged head is provided with an inclined surface matching the inclination of the clamping block.

[0027] Through the above technical solution, the inclined surface of the steel bar enlarged head is consistent with the inclination of the clamping block, thereby improving the expansion effect of the expansion screw on the steel bar enlarged head.

[0028] The present invention is further configured as follows: the end wedge-shaped plug is provided with a plug bolt, and the plug bolt passes through the flat opening and abuts against the end wedge-shaped plug.

[0029] Through the above technical solution, the plug bolt can fine-tune the small gap between the end wedge plug and the flat mouth, thereby improving the connection strength between the steel bar and the sleeve.

[0030] The present invention is further configured as follows: the port of the cylinder is retracted inwardly and extends in the length direction of the cylinder to form a tapered end, and the enlarged head at the end of the steel bar is smaller than the tapered end.

[0031] Through the above technical solution, after the enlarged head of the steel bar is inserted into the tapered end, a gap is formed between the enlarged head and the tapered end.

[0032] The present invention is further configured such that: the expansion device arranged between the conical closing end and the enlarged head of the steel bar is a plurality of plugs.

[0033] Through the above technical solution, the conical closing and the enlarged head of the steel bar are expanded and tightened by the plug, thereby improving the tensile strength between the steel bar and the sleeve.

[0034] The present invention is further configured to include a butt bolt; the steel bar enlarged head is a conical frustum-shaped enlarged head with the same taper as the conical closing end, and the butt bolt passes through the conical surface of the conical closing end and butts against the plug.

[0035] Through the above technical solution, the abutment bolt further abuts the plug and the enlarged head of the steel bar, thereby improving the connection strength between the steel bar and the sleeve.

[0036] The present invention is further configured as follows: an interlayer expansion plug is inserted between two layers of plug sheets, and an insertion hole for the interlayer expansion plug to be inserted is provided on the cylinder.

[0037] Through the above technical solution, the gap between the two layers of plugs is filled, thereby improving the expansion and tightening effect between the enlarged head and the port.

[0038] The present invention is further configured as follows: a sandwich screw is inserted between the two layers of plug sheets, and an insertion hole for the sandwich screw to be inserted is provided on the barrel.

[0039] Through the above technical solution, the gap between the two layers of plugs is filled with the screw, thereby improving the expansion and tightening effect between the enlarged head and the port.

[0040] The present invention is further configured as follows: the expansion device arranged between the tapered closing and the enlarged head of the steel bar is four petal-shaped ring members, and the petal-shaped ring members are formed by obliquely cutting a semicircular ring. The inner diameter of the circular ring composed of the four petal-shaped ring members matches the steel bar, and the outer diameter matches the inner wall of the cylinder. The two end faces of the circular ring respectively match the tapered closing of the cylinder and the inclined surface of the enlarged head.

[0041] Through the above technical scheme, the cylinder is buckled to radially compress the petal-shaped ring. After being squeezed, the petal-shaped ring will axially expand the obliquely cut inclined surface. The petal-shaped ring converts the radial squeezing force into an axial expansion force, expands the gap between the two enlarged heads, and improves the connection strength between the two enlarged heads.

[0042] The present invention is further configured as follows: a plurality of pairs of middle wedge-shaped expansion plugs are arranged between the two steel bar enlarged heads, a through hole for the middle wedge-shaped expansion plug to pass through is opened in the middle of the cylinder, and the middle wedge-shaped expansion plug passes through the through hole and is inserted between the two steel bar enlarged heads.

[0043] Through the above technical solution, the middle wedge-shaped expansion plug is inserted between the two steel bar enlarged heads to strengthen the axial compressive strength of the steel bar and the sleeve, and further strengthen the connection structure of the steel bar and the sleeve.

[0044] The present invention is further configured as follows: the cylinder includes an end cover, a circular hole for the steel bar to pass through is provided in the middle of the end cover; an L-shaped plug is provided between the end cover and the enlarged head, the L-shaped plug includes a vertical portion and a transverse portion, one end of the vertical portion is abutted against the enlarged head, and the other end is fixedly connected to the transverse portion; the transverse portion is located between the end cover and the cylinder opening.

[0045] Through the above technical solution, the L-shaped plug tightens the gap between the steel bar and the sleeve, and the end cover pushes the L-shaped plug to abut against the enlarged head of the steel bar. At the same time, the end cover prevents the L-shaped plug from sliding out of the sleeve, thereby strengthening the connection strength between the sleeve and the steel bar.

[0046] The present invention is further configured as follows: a middle wedge-shaped expansion plug is provided between the two enlarged heads.

[0047] Through the above technical solution, the middle wedge-shaped expansion plug fills the gap between the two enlarged heads of the steel bars, and the axial force of the sleeve connection structure realizes the force transmission, thereby improving the axial compressive strength of the sleeve and the steel bars.

[0048] The present invention is further configured as follows: the two ports or one of the ports of the sleeve are of a conical funnel structure; at least two first clamping blocks are arranged around the axis of each conical funnel; the conical funnel includes a conical inclined surface and a bottom opening, and the first clamping block can move along the conical inclined surface; the ends of the two steel bars to be connected are provided with enlarged heads, and when the enlarged heads extend into the conical funnel from the bottom opening of the funnel, the first clamping block is pushed upward, and when the enlarged head steel bar is pulled back, the first clamping block clamps the enlarged head in the cylinder.

[0049] Through the above technical solution, the enlarged head is extended to push the first clamping block to the upper part of the conical funnel. Since the upper structure of the conical funnel is larger than the lower structure, the first clamping block is pushed open, and the enlarged head enters onto the first clamping block to pull the steel bar back. The first clamping block fills the gap between the enlarged head and the sleeve port to achieve the expansion effect.

[0050] The present invention is further configured to include a top screw that presses against the first clamping block.

[0051] Through the above technical solution, the top screw is inserted through the cylinder wall and abuts against the first clamping block, thereby preventing the first clamping block from moving along the conical inclined surface.

[0052] The present invention is further configured as follows: the enlarged head is formed by screwing a steel bar with a threaded end into a nut.

[0053] Through the above technical solution, the nut is screwed into the steel bar thread to form an enlarged head, which is convenient to operate.

[0054] The present invention is further configured as follows: the enlarged head is formed by cold pressing a sleeve ring onto the end of the steel bar.

[0055] Through the above technical scheme, since it is difficult to directly cold press the enlarged heads into various shapes through the cold pressing process, a shaped ring is sleeved on the end of the steel bar and then cold pressed, which facilitates the realization of steel bar enlarged heads of different shapes, and then facilitates matching different sleeve ports.

[0056] The present invention is further configured as follows: the enlarged head is extruded to form a conical surface, and a matching enlarged ring is arranged outside the steel bar.

[0057] Through the above technical solution, the enlarged head ring is formed with the steel bar by cold pressing to form an enlarged head, and different enlarged rings can be configured to match the size of the sleeve port.

[0058] Another object of the present invention is to provide a sleeve, which includes a cylinder body and ports at both ends, the ends of the steel bars are provided with enlarged heads, and one end of the two steel bars with the enlarged heads is clamped in the cylinder body; a tightening device is provided between the two enlarged heads or between the enlarged head and the port, and the tightening device fills the gap between the two enlarged heads or between the enlarged head and the two ports.

[0059] In summary, the present invention has the following beneficial effects:

[0060] 1. The setting of the middle wedge-shaped expansion plug and the end wedge-shaped expansion plug improves the connection strength between the steel bar and the sleeve;

[0061] 2. The setting of the middle flat pad and the end flat pad makes it easy to adjust the small gap between the middle wedge-shaped expansion plug or the end wedge-shaped expansion plug and the steel bar, which facilitates on-site installation;

[0062] 3. The setting of the tightening bolt strengthens the tightening effect of the middle wedge-shaped expansion plug or the end wedge-shaped expansion plug, and is more convenient for adjustment;

[0063] 4. When the port is tapered or has an end cover, the setting of the plug will fill the gap between the enlarged head and the tapered end, which is more reliable than filling with concrete, thereby enhancing the tensile effect of the connection structure; the setting of the push bolt facilitates the fixation of the plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic diagram of embodiment 1;

[0065] Figure 2 A schematic diagram for highlighting the tightening bolt;

[0066] Figure 3 It is a schematic diagram of the end wedge-shaped expansion plug;

[0067] Figure 4 It is the plan view of the end flat pad;

[0068] Figure 5 A schematic diagram of a protruding plug bolt is shown;

[0069] Figure 6 To highlight the schematic diagram of the middle expansion plug inserted from the through hole;

[0070] Figure 7 A schematic diagram of a prominent plug and abutment bolt;

[0071] Figure 8 A schematic diagram for highlighting the sandwich screw;

[0072] Fig. 9 A schematic diagram showing the interlayer expansion plug;

[0073] Fig.10 A schematic diagram to highlight the ring;

[0074] Fig.11 To highlight the schematic diagram of the middle expansion plug inserted from the through hole;

[0075] Fig.12 is a schematic diagram of an end cap and an L-shaped plug;

[0076] Fig.13is a schematic diagram of an end cap and an L-shaped plug;

[0077] Fig.14 It is a schematic diagram of a wedge-shaped expansion plug protruding from the middle;

[0078] Fig.15 To highlight the schematic diagram of the expansion bolt;

[0079] Fig.16 To highlight the schematic diagram of the inclined surface of the steel bar enlargement head;

[0080] Fig.17 This is a schematic diagram showing that the expansion screw has not been pulled out;

[0081] Fig.18 To highlight the schematic diagram of the expansion screw;

[0082] Fig.19 A schematic diagram to highlight the conical funnel structure;

[0083] Figure 20-Figure 28 Schematic diagram of the steel bar expansion head;

[0084] Fig.29 It is a schematic diagram of background technology;

[0085] Fig.30 A schematic diagram of background technology.

[0086] Reference numerals: 1, sleeve; 11, flat end; 12, tapered end; 13, cylinder unit; 14, fixing ring; 15, prefabricated component; 2, steel bar; 21, enlarged head; 22, sleeve ring; 23, enlarged ring; 24, nut; 3, middle wedge-shaped expansion plug;

[0087] 4. Middle flat washer; 5. End wedge-shaped expansion plug; 51. First notch; 52. Push bolt; 53. Interlayer expansion plug; 54. Interlayer screw; 55. First clamp; 56. Petal-shaped ring; 57. Top screw; 6. End flat washer; 61. Second notch; 7. Push bolt; 8. Plug; 81. Bending structure; 82. Anti-slip part; 9. End cover; 10. L-shaped plug; 101. Vertical part; 102. Horizontal part; 111. Expansion bolt; 112. Cylinder; 113. Block; 114. Expansion screw; 115. Inclined surface; 116. L-shaped block. DETAILED DESCRIPTION

[0088] The present invention will be further described in detail below with reference to the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", "lower", "bottom" and "top" used in the following description refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0089] Embodiment 1: A sleeve 1 connection structure with an expansion device, such as Figure 1 As shown, it includes a sleeve 1 and two steel bars 2 to be connected, the sleeve 1 includes a cylinder body and ports at both ends, the ends of the steel bars 2 are provided with enlarged heads 21, and one end of the two steel bars 2 with the enlarged heads 21 is clamped inside the cylinder body; an expansion device is provided between the two enlarged heads 21 or between the enlarged head 21 and the ports, and the expansion device fills the gap between the two enlarged heads 21 or between the enlarged head 21 and the two ports.

[0090] The port of the sleeve 1 can be a flat port 11 or a tapered port 12. In the two different cases, the expansion devices are different. This embodiment mainly introduces the case where the port is a flat port 11. The two ends of the port of the sleeve 1 are inwardly contracted to form a flat port 11. The sleeve 1 is a petal structure that can be snapped together. After snapping together, it can be bolted together to form an integral sleeve 1. The expansion device between the two enlarged heads 21 of the sleeve 1 is a pair of middle wedge-shaped expansion plugs 3. The inclined surfaces 115 of the two middle wedge-shaped expansion plugs 3 squeeze each other, and the more they squeeze, the tighter they are.

[0091] The middle wedge-shaped expansion plug 3 can be located inside the cylinder or can be inserted from the through hole on the cylinder. When the middle wedge-shaped expansion plug 3 is located inside the cylinder, during construction, the middle wedge-shaped expansion plug 3 slightly thicker than the gap between the enlarged heads 21 is first selected, and the middle wedge-shaped expansion plug 3 is squeezed in the length direction through the snap-fit ​​connection of the split cylinder. The middle wedge-shaped expansion plug 3 converts the squeeze force received into the expansion force in the length direction of the steel bar 2, between the enlarged heads 21 of the two steel bars 2, thereby improving the axial compressive capacity of the sleeve 1 and the steel bar 2, and further improving the connection strength of the sleeve 1 and the steel bar 2.

[0092] At the same time, in order to make it easier to adjust the middle wedge-shaped expansion plug 3, see Figure 2 , a tightening bolt 52 may also be provided, and the tightening bolt 52 vertically passes through the cylinder wall and squeezes on the middle wedge-shaped expansion plug 3 to further expand the two middle wedge-shaped expansion plugs 3. In actual construction projects, when the distance between the enlarged heads 21 of the two steel bars 2 is large and the middle wedge-shaped expansion plug 3 cannot meet the filling requirements, a middle flat washer 4 may be placed for adjustment to assist the middle wedge-shaped expansion plug 3 in expanding the enlarged heads 21 of the two steel bars 2. In this way, the axial pressure is transmitted between the enlarged heads 21 of the two steel bars 2, and the axial compressive strength of the enlarged heads 21 of the steel bars 2 and the sleeve 1 is improved.

[0093] Combination Figure 6 The split sleeve 1 can also first buckle the two enlarged heads 21 in the sleeve 1, and the cylinder between the enlarged heads 21 of the two steel bars 2 is provided with a through hole (not shown in the figure) for the middle wedge-shaped expansion plug 3 to pass through, and then the paired middle wedge-shaped expansion plugs 3 are inserted from the through hole to tighten the gap between the two enlarged heads 21.

[0094] Furthermore, combined with Figure 3An end wedge-shaped expansion plug 5 is arranged between the flat mouth 11 and the enlarged head 21 of the sleeve 1. The end wedge-shaped expansion plug 5 is provided with a first notch 51 for avoiding the steel bar 2. If the end wedge-shaped expansion plug 5 is not tight enough, the end flat washer 6 can be used for fine adjustment. Figure 4 A second notch 61 is provided on the end flat pad 6 to avoid the steel bar 2. The number and thickness of the flat pads can be set according to the gap that needs to be fine-tuned. In order to strengthen the expansion of the end wedge-shaped expansion plug 5, a tightening bolt 52 is provided to tighten the end wedge-shaped expansion plug 5. The tightening bolt 52 is vertically inserted into the cylinder wall and abuts against the end tightening expansion plug to further squeeze the end tightening expansion plug.

[0095] Further, combined with Figure 5 The flat port 11 of the sleeve 1 is provided with a plug bolt 7. The function of the plug bolt 7 is to use the plug bolt 7 to pass through the flat port 11 and abut against the bottom end of the enlarged head 21 or the end wedge-shaped expansion plug 5 or the end flat pad 6 when there is a relatively small gap between the flat port 11 and the end wedge-shaped expansion plug 5. The plug bolt 7 is screwed to achieve axial tightening of the sleeve 1.

[0096] By arranging the wedge-shaped expansion plug, the tightening bolt 52 and the flat washer, the expansion function of the sleeve 1 is realized, the axial pressure of the sleeve 1 connection structure is transmitted, and the axial compressive strength of the sleeve 1 connection structure is enhanced.

[0097] In actual application, the gap can be adjusted by adopting appropriate combination according to the size of the gap.

[0098] Embodiment 2: Combination Figure 7 , which is different from the first embodiment in that the end of the sleeve 1 is inwardly contracted and extends in the length direction of the cylinder to form a tapered opening 12, the enlarged head 21 at the end of the steel bar 2 is smaller than the tapered opening 12, and the steel bar 2 is inserted into the cylinder through the tapered opening 12. The expansion device for the gap between the tapered opening 12 and the enlarged head 21 of the steel bar 2 is a plug 8, and the plug 8 is made of a light and thin material. During the insertion of the plug 8, when the plug 8 and the enlarged head 21 of the steel bar 2 are pressed against each other to form a bent structure 81, the other end of the plug 8 is outside the sleeve 1. During the operation, the number of plugs 8 is adjusted according to the size of the gap until the plug 8 expands the gap to prevent the steel bar 2 from moving away from the sleeve 1, thereby improving the tensile strength of the steel bar 2 and the sleeve 1.

[0099] To fill the gap between the plug 8 and the tapered end 12, see Figure 8 and Fig. 9 An insertion hole can be opened on the cylinder wall, and the interlayer expansion plug 53 can be inserted from the insertion hole to fill the gap between the plug piece 8 and the tapered mouth. Alternatively, the interlayer screw 54 can be screwed into the insertion hole between the two plug pieces 8 to fill the gap between the plug piece 8 and the tapered mouth.

[0100] In order to prevent the plug 8 from falling off, one end of the plug 8 outside the cylinder is connected to the steel bar 2 through an anti-dropping piece 82. The anti-dropping piece 82 can be a common elastic ring that can bundle the plug 8 and the steel bar 2 together.

[0101] Furthermore, the enlarged head 21 is a truncated cone with the same taper as the conical end 12. The abutment bolt is inserted from the conical end 12 and abuts on the conical surface of the enlarged head 21 or the plug 8, pushing the enlarged head 21, thereby fixing the plug 8 and preventing it from falling off. When applied to a construction scene where two steel bars 2 can move freely, the abutment bolt can also push the two enlarged heads 21 to abut against each other to achieve a compressive resistance.

[0102] Further, combined with Fig.11 A through hole is provided between the two steel bar 2 enlarged heads 21 of the cylinder wall for the middle wedge-shaped expansion plug 3 to pass through, and the middle wedge-shaped expansion plug 3 is inserted from the through hole between the two enlarged heads 21 to tighten. The middle wedge-shaped expansion plug 3 can also be put into the expansion between the two steel bar 2 enlarged heads 21 and then buckled, and the middle wedge-shaped expansion plug 3 is tightened through the cylinder wall by the tightening bolt 52.

[0103] In addition, the expansion device between the conical closing end 12 and the enlarged head 21 of the steel bar 2 in this embodiment can also be replaced by a petal-shaped ring member 56, see Fig.10 The petal-shaped ring member 56 is formed by obliquely cutting a semicircular ring. The inner diameter of the ring formed by the combination of four petal-shaped ring members 56 matches the steel bar 2, and the outer diameter matches the conical surface of the inner wall of the cylinder. The two end faces of the ring match the conical closing end 12 of the cylinder and the inclined surface 115 of the enlarged head 21 respectively.

[0104] During installation, the cylinder unit 13 buckles the petal-shaped ring 56 and the enlarged head 21 of the steel bar 2 in the cylinder. During the buckling and pressing process of the cylinder unit 13, the petal-shaped ring 56 is also pressed. The petal-shaped ring 56 contracts radially toward the cylinder wall, thereby squeezing the other petal of the petal-shaped ring 56 axially along the oblique direction, thereby axially expanding the space between the two enlarged heads 21.

[0105] Embodiment 3: The difference from Embodiment 1 is that it also includes an end cap 9, see Fig.12 The end cap 9 is threadedly matched with the cylinder body, and a circular hole (not shown) is provided in the middle of the end cap 9 for the steel bar 2 to pass through. The expansion device is an L-shaped plug 10, which includes a vertical portion 101 and a horizontal portion 102. One end of the vertical portion 101 abuts against the enlarged head 21, and the other end is fixedly connected to the horizontal portion 102. The horizontal portion 102 is located between the end cap 9 and the opening of the cylinder body. During installation, the vertical portion 101 of the L-shaped plug 108 is abutted against the enlarged head 21, and the end cap 9 is screwed to push the horizontal portion 102 of the L-shaped plug 10 to make the vertical portion 101 and the enlarged head 21 of the steel bar 2 abut tightly, while preventing the L-shaped plug 10 from moving away from the sleeve 1, thereby improving the connection strength between the steel bar 2 and the sleeve 1.

[0106] Applicable to the construction scenario where two steel bars 2 are embedded in the prefabricated component 15, see Fig.14 , put the middle wedge-shaped expansion plug 3 between the two enlarged heads 21.

[0107] When applied to a construction scenario where two steel bars 2 can move freely, the end cover 9 can also push the L-shaped plug 10 to make the two enlarged heads 21 abut against each other to achieve a compressive resistance effect.

[0108] See also Fig.13 The L-shaped plug 10 can also be an L-shaped block 116, and the vertical portion 101 extends outward from the end cover 9 to fill the gap between the end cover 9 and the steel bar 2.

[0109] Embodiment 4: The difference from Embodiment 1 is that the expansion device between the enlarged heads 21 of the two steel bars 2 is an expansion bolt 111. Fig.15 The expansion bolt 111 includes a cylinder 112 and two blocks 113 at the ends of the cylinder 112, and also includes an expansion screw 114. The expansion bolt 111 is fixedly connected between the two enlarged heads 21 of the steel bars 2 of the cylinder body, and the expansion screw 114 passes through the cylinder 112 from one end of the cylinder 112 and enters between the two blocks 113, pushing the two blocks 113 open, and the two opened blocks 113 tilt to both sides and abut against the enlarged heads 21 of the steel bars 2, so as to achieve the expansion and tightening effect on the gap between the enlarged heads 21 of the steel bars 2.

[0110] For further information, see Fig.16 The steel bar 2 is expanded into an inclined surface 115 that matches the inclination of the clamping block 113. When the tightening screw 114 pushes the clamping block 113 open, the two sides of the two clamping blocks 113 are inclined and completely abut against the inclined surface 115 of the enlarged head 21 of the steel bar 2, thereby improving the tightening effect of the tightening bolt 111 on the gap between the enlarged heads 21 of the steel bar 2.

[0111] Combination Fig.17 and Fig.18 The expansion screw 114 can also be tightened by screwing outwards. Fig.17 To achieve the untensioned state, screw the tensioning screw 114 outward, see Fig.18 , lift up the clamping block 113, and the protruding part of the clamping block 113 abuts against the large end of the steel bar 2.

[0112] During construction, the prefabricated components 15 are first hoisted into place so that the steel bars 2 with enlarged heads 21 on different prefabricated components 15 are positioned opposite each other; the split sleeve 1 is buckled at the connection between the two steel bars 2, and the expansion screw 114 is inserted into the gap between the two enlarged heads 21; the split sleeve 1 is connected into a whole; the bolt is tightened to move it into the cylinder body to push the two clamping blocks 113 open; when the clamping block 113 completely fills and tightens the gap between the two enlarged heads 21, stop tightening the bolt.

[0113] Embodiment 5: The difference from Embodiment 1 is that, see Fig.19 The two ports or one of the ports of the sleeve 1 are of a conical funnel structure, and the expansion device between the steel bar 2 and the port is two first clamping blocks 55. The inclination angle of the first clamping block 55 is consistent with that of the conical funnel and the first clamping block 55 can move along the conical surface of the conical funnel.

[0114] During installation, the enlarged head 21 of the steel bar 2 extends into the conical funnel from the bottom opening, and the first clamping block 55 is pushed upward. The upper part of the conical funnel has a large spacing, the first clamping block 55 opens, and the enlarged head 21 of the steel bar 2 extends into the middle of the two first clamping blocks 55. Then the steel bar 2 is pulled back, and the two first clamping blocks 55 fall back. The first clamping block 55 is clamped between the end of the cylinder and the enlarged head 21 of the steel bar 2. To prevent the first clamping block 55 from sliding along the conical surface of the conical funnel again, a top screw 57 is inserted into the port of the sleeve 1 perpendicular to the conical surface, and the top screw 57 abuts against the first clamping block 55 to limit the movement of the first clamping block 55.

[0115] There are various processing methods for the enlarged head 21 of the steel bar 2. There is no unique processing method for the enlarged head 21 of the steel bar 2. Figure 20-Figure 28 The straight bar can be made into a simple folding hook, or it can be made into a continuous bending structure 81, or it can be a spherical enlarged head 21, or the steel bar 2 can be made into a circular enlarged head 21 or a truncated cone-shaped enlarged head 21 through a cold pressing process, or the steel bar 2 can be processed into a rectangular enlarged head 21 or a cube enlarged head 21 through a hot rolling process.

[0116] See also Fig.25 The enlarged head 21 can be formed by screwing a steel bar 2 with a threaded end into a nut 24; see Fig.28 , when cold pressing is not easy to form a rectangular shape, the steel bar 2 processed by the hot rolling process is lower in strength than the steel bar 2 processed by the cold pressing process because the high temperature will destroy the structure of the non-metallic impurities inside the steel bar 2. In order to avoid the above problem, a rectangular ring 22 can be set on the end of the steel bar 2, and the ring 22 and the steel bar 2 can be cold pressed together to form an enlarged head 21 of the steel bar 2; Fig. 27 The enlarged head 21 of the steel bar 2 needs to match the unused sleeve 1. When adjusting the size, the end of the steel bar 2 is first extruded into shape, and the enlarged head 21 is extruded into a conical surface. According to the requirements of the ports of the sleeve 1 of different models, the inner cavity can be selected to match the conical surface of the steel bar 2. The enlarged ring 23 of different external sizes is sleeved on the end of the steel bar 2 to adjust the size of the enlarged head 21 of the steel bar 2.

[0117] In summary, the above-mentioned different combinations can be selected according to actual working conditions to fill the gap between the two enlarged heads 21 or between the enlarged head 21 and the two ports, thereby improving the tensile and compressive strengths between the steel bar 2 and the sleeve 1.

[0118] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A sleeve connection structure with an expansion device, characterized in that: The invention comprises a sleeve (1) and two steel bars (2) to be connected, wherein the sleeve (1) comprises a cylinder body and ports at both ends, the ends of the steel bars (2) are provided with enlarged heads (21), and one end of the two steel bars (2) with the enlarged heads (21) is clamped in the cylinder body; an expansion device is provided between the two enlarged heads (21) or between the enlarged head (21) and the ports, and the expansion device fills the gap between the two enlarged heads (21) or between the enlarged head (21) and the two ports; The cylinder is a petal structure, the end of the cylinder is inwardly contracted to form a closed opening, the closed opening is a flat opening (11), and the enlarged head (21) at the end of the steel bar (2) is larger than the flat opening (11); The expansion device comprises a plurality of pairs of middle wedge-shaped expansion plugs (3) arranged between the enlarged heads (21) of two steel bars (2), wherein the middle wedge-shaped expansion plugs (3) and the enlarged heads (21) of the steel bars (2) are buckled together in the cylinder; A plurality of middle flat washers (4) are arranged between the two enlarged heads (21) of the steel bars (2), and the middle flat washers (4) are between the middle wedge-shaped expansion plug (3) and the enlarged heads (21) of the steel bars (2); The expansion device also includes a plurality of paired end wedge-shaped expansion plugs (5) arranged between the flat mouth (11) and the enlarged head (21) of the steel bar (2), the end wedge-shaped expansion plugs (5) being provided with a first notch (51) for avoiding the steel bar (2); and a plurality of end flat washers (6) being arranged between the flat mouth (11) and the enlarged head (21) of the steel bar (2), the end flat washers (6) being provided with a second notch (61) for avoiding the steel bar (2).

2. A sleeve connection structure with an expansion plug according to claim 1, characterized in that: The middle wedge-shaped expansion plug (3) or the end wedge-shaped expansion plug (5) is provided with a tightening bolt (52), and the tightening bolt (52) passes through the cylinder wall and abuts against the middle wedge-shaped expansion plug (3) or the end wedge-shaped expansion plug (5).

3. The sleeve connection structure with a tightening device according to claim 1, characterized in that: The enlarged head (21) is formed by screwing a steel bar (2) with a threaded end into a nut (24).

4. The sleeve connection structure with a tightening device according to claim 1, characterized in that: The enlarged head (21) is formed by cold pressing a sleeve (22) onto the end of the steel bar (2).

5. The sleeve connection structure with a tightening device according to claim 1, characterized in that: The enlarged head (21) is extruded to form a conical surface, and a matching enlarged ring (23) is arranged outside the steel bar (2).

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