A building reinforcing steel sleeve grouting permanent connecting device

Abstract

The application relates to a building steel sleeve grouting permanent connecting device which effectively solves the problem of poor tensile and shearing resistance of the sleeve grouting connection; the technical solution comprises a cylindrical outer mold and a reinforcing part in the outer mold, the reinforcing part is an axial reinforcing part and a radial reinforcing part, the axial reinforcing part comprises a ''Fang'' type structure formed by two L-shaped plates hinged, each of the upper and lower end faces of the ''Fang'' type structure is provided with a steel bar penetrating hole, the opening side of the ''Fang'' type structure is provided with a top pressing unit, the radial reinforcing part comprises a sleeve pipe in the ''Fang'' type structure, the two steel bar ends to be connected are respectively penetrated into the ''Fang'' type structure from the first steel bar penetrating hole and the second steel bar penetrating hole at the two ends, then the two steel bar ends are penetrated into the sleeve pipe from the two ends of the sleeve pipe and are butted in the sleeve pipe; the application effectively enhances the axial and radial load bearing capacity of the connecting position to the steel bar, and can effectively avoid connection failure.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and specifically to a permanent connection device for grouting of building steel bar sleeves. Background Art

[0002] The sleeve grouting connection technology is a connection technology for the permanent connection of the ends of steel bars. It inserts the ends of two steel bars to be connected into the sleeve for butt joint, and then pours special high-strength cement-based grouting material into the sleeve. After the slurry solidifies, the two steel bar ends are connected together by the adhesive force between the concrete and the outer wall of the steel bar. However, the adhesive force between the concrete and the steel bar is limited. When the steel bar is axially tensioned, it is easy to separate from the concrete, resulting in poor axial tensile and pull-out resistance of the connected steel bars. Moreover, when the steel bar is misaligned by a radial force, the concrete is also prone to shear failure. Therefore, relying solely on the connection by concrete wrapping, the axial and radial bearing capacities of the steel bar are both poor.

[0003] For the invention patent with the application number 201810997920.3, a conical elastic buckle is provided in the sleeve, which can play a certain role in enhancing the axial tensile capacity of the steel bar, but the enhancement effect of the elastic buckle is limited and it cannot improve its radial shear resistance. Summary of the Invention

[0004] The present invention provides a permanent connection device for grouting of building steel bar sleeves, aiming to solve the problems of poor tensile and shear resistance of sleeve grouting connections.

[0005] The technical solution it adopts includes a cylindrical outer mold and a reinforcing part located inside the outer mold. The upper and lower ends of the outer mold are closed, and there is a grouting port at the lower end and a slurry outlet at the upper end. A first steel bar passing hole is opened at the center of each of the upper and lower end faces of the outer mold. The reinforcing part is divided into an axial reinforcing part and a radial reinforcing part. The axial reinforcing part includes two L-shaped plates. One end of each of the two L-shaped plates is hinged together to form a "U" shaped structure. A second steel bar passing hole is opened on each of the upper and lower end faces of the "U" shaped structure. A pressing unit is provided on the open side of the "U" shaped structure. The pressing unit includes two internal thread sleeves. The end parts of the two internal thread sleeves are respectively hinged to the inner sides of the upper and lower end faces of the "U" shaped structure, and the two internal thread sleeves are coaxial. An external threaded rod is connected between the two internal thread sleeves. The two ends of the external threaded rod are respectively screwed into the internal thread sleeves at the same end, and the thread directions of the external threaded rod and the two internal thread sleeves are opposite. The radial reinforcing part includes a sleeve located inside the "U" shaped structure. The two ends of the steel bars to be connected respectively pass through the first steel bar passing holes at both ends and the second steel bar passing holes and enter the "U" shaped structure, and then pass through the two ends of the sleeve and are butt-jointed inside the sleeve.

[0006] A first arched plate is fixed on the outer sides of the upper and lower ends of the "U" shaped structure, and the concave surfaces of the two first arched plates face away from each other.

[0007] The described radial strengthening part further includes four second arched plates, which are evenly distributed circumferentially around the axis of the sleeve, and the concave surfaces of the four second arched plates face outward. Each second arched plate is fixedly connected to the outer wall of the sleeve through a connecting plate.

[0008] Alloy blocks are embedded on the upper and lower end surfaces of the described "C"-shaped structure. The hardness of the alloy blocks is greater than that of the steel bars, and the second steel bar passing holes are formed on the alloy blocks.

[0009] The inner wall of the described second steel bar passing hole is provided with pointed teeth.

[0010] A section of external hexagon is provided in the middle of the described external threaded rod for rotating the external threaded rod.

[0011] A sealing ring is provided in the first steel bar passing hole.

[0012] The outer mold is of a split structure and is axially cut into two symmetrical semi-cylindrical bodies, and the two parts are connected by flange bolts.

[0013] Reinforcing rib plates are welded at the inner corners of the described L-shaped plate.

[0014] The present invention effectively enhances the bearing capacity of the connection position to the axial and radial loads of the steel bars, and can effectively avoid connection failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the front view of the present invention, the internal structure is not shown, and the outer mold is in perspective.

[0016] Figure 2 is the front view sectional view of the present invention.

[0017] Figure 3 is Figure 2 the enlarged view of position A in

[0018] [[ID=4I]] Figure 4 is the three-dimensional view of the strengthening part.

[0019] Figure 5 is the three-dimensional view of the axial strengthening part.

[0020] Figure 6 is the top view of the radial strengthening part.

[0021] Figure 7 is the three-dimensional view of the radial strengthening part.

[0022] Figure 8 is the front view sectional view of the connection position after the concrete solidifies. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Combined with the attached drawings, the present invention includes a cylindrical outer mold 1 and a strengthening part located inside the outer mold 1. The upper and lower ends of the outer mold 1 are closed, and a grouting port 2 is provided at the lower end, and a slurry outlet 3 is provided at the upper end. A first steel bar penetrating hole 4 is opened at the center of the upper and lower end faces of the outer mold 1. The end parts of two steel bars to be connected respectively penetrate into the outer mold 1 from the first steel bar penetrating holes 4 at the upper and lower ends to achieve butt joint; the strengthening part is divided into an axial strengthening part and a radial strengthening part. The axial strengthening part includes two L-shaped plates 5. One end of the two L-shaped plates 5 is hinged together to form a "U"-shaped structure. A second steel bar penetrating hole 6 is opened on each of the upper and lower end faces of the "U"-shaped structure. The two second steel bar penetrating holes 6 are opposite to each other up and down. After the steel bar to be connected penetrates into the outer mold 1 from the first steel bar penetrating hole 4, it then passes through the second steel bar penetrating hole 6 to achieve butt joint; a pressing unit is provided on the opening side of the "U"-shaped structure. The pressing unit includes two internal thread sleeves 7. The end parts of the two internal thread sleeves 7 are respectively hinged to the inner sides of the upper and lower end faces of the "U"-shaped structure, and the two internal thread sleeves 7 are coaxial. The two internal thread sleeves 7 are connected by an external threaded rod 8. The two ends of the external threaded rod 8 are respectively screwed into the internal thread sleeves 7 at the same end, and the thread directions of the external threaded rod 8 and the two internal thread sleeves 7 are opposite; by rotating the external threaded rod 8, the two internal thread sleeves 7 can move synchronously towards each other or synchronously away from each other, thereby pushing the two L-shaped plates 5 to rotate around the hinged end, making the opening of the "U"-shaped structure larger or smaller. After the L-shaped plates 5 rotate, the second steel bar penetrating hole 6 is not coaxial with the steel bar, and both sides of the second steel bar penetrating hole 6 clamp the steel bar, preventing the steel bar from axially slipping; the radial strengthening part includes a sleeve 9 located inside the "U"-shaped structure. The end parts of the two steel bars to be connected respectively penetrate into the "U"-shaped structure from the first steel bar penetrating holes 4 and the second steel bar penetrating holes 6 at both ends, and then penetrate into the sleeve 9 from both ends of the sleeve 9 and achieve butt joint inside the sleeve 9. The sleeve 9 can limit the radial dislocation of the end parts of the two steel bars, reducing the shearing effect on the concrete.

[0024] A first arched plate 10 is fixed on the outer sides of the upper and lower ends of the described "U"-shaped structure. The concave surfaces of the two first arched plates 10 face away from each other. In the case where the steel bar is locked in the second steel bar penetrating hole 6, the axial pulling of the two steel bars acts on the convex surface side of the first arched plate 10 through the two "U"-shaped structures. Figure 2 As can be seen from the force schematic diagram of the first arched plate 10, when the convex surface side of the first arched plate 10 is subjected to the force generated by the axial pulling of the steel bar, the force of its concave surface side on the concrete is squeezing towards the center of the circle. And the concrete has good compressive resistance. Therefore, the first arched plate 10 has good bearing capacity for the force from the convex surface side, and further enables the L-shaped plate 5 to have good anti-deformation ability under the axial tension of the steel bar, and can well limit the axial pulling of the steel bar, avoiding the separation of the steel bar from the concrete.

[0025] The described radial strengthening part further includes four second arch plates 11. The four second arch plates 11 are evenly distributed circumferentially with the axis of the sleeve 9 as the center, and the concave surfaces of the four second arch plates 11 face outward. Each second arch plate 11 is fixedly connected to the outer wall of the sleeve 9 through a connecting plate 12. The four second arch plates 11 also have good bearing capacity for the acting force from the convex side, so they can further strengthen the bearing capacity for the radial acting force generated by the radial displacement of the two steel bars, and avoid the shear failure of the concrete under the acting force of the radial displacement of the steel bars.

[0026] Alloy blocks 13 are embedded on the upper and lower end surfaces of the described "C"-shaped structure. The hardness of the alloy blocks 13 is greater than that of the steel bars, such as the tool steel commonly used in machining cutting tools. The second steel bar passing holes 6 are opened on the alloy blocks 13. The high hardness of the alloy blocks 13 can prevent the second steel bar passing holes 6 from being crushed and deformed, and ensure an effective clamping force on the steel bars.

[0027] The inner wall of the described second steel bar passing hole 6 is provided with pointed teeth 14, and the teeth 14 can penetrate into the surface of the steel bar to improve the clamping force on the steel bar.

[0028] A section of external hexagon 15 is provided in the middle of the described external threaded rod 8 for rotating the external threaded rod 8.

[0029] A sealing ring 16 is provided in the first steel bar passing hole 4 to prevent grout leakage from the gap between the first steel bar passing hole 4 and the steel bar during grouting.

[0030] The described outer mold 1 is of a split structure and is axially cut into two symmetrical semi-cylinders, and the two parts are connected by flange bolts for easy demolding.

[0031] Reinforcing rib plates 17 are welded at the inner corners of the described L-shaped plate 5 to improve the anti-deformation ability of the L-shaped plate 5.

[0032] When the present invention is in use, the radial strengthening part is placed inside the "C"-shaped structure of the axial strengthening part. The two steel bars to be connected are inserted into the "C"-shaped structure through the second steel bar passing holes 6 at both ends, and are inserted into the sleeve 9 from both ends of the sleeve 9 for docking. Then, the external threaded rod 8 is rotated through the external hexagon 15 to push the two internal threaded sleeves 7 outward or pull the two internal threaded sleeves 7 inward, so that the two L-shaped plates 5 rotate around the hinged end, and further make the second steel bar passing holes 6 eccentrically clamp the steel bars; then the outer mold 1 is buckled outside the axial strengthening part and tightened with flange bolts, grout is injected into the outer mold 1 from the bottom grouting hole until the grout overflows from the slurry outlet 3, stop grouting, let it stand until the concrete slurry completely solidifies, and then remove the flange bolts and remove the outer mold 1.

[0033] The present invention eccentrically clamps the steel bars through the L-shaped plate 5, and improves the load-bearing and deformation resistance of the L-shaped plate 5 through the two first arch plates 10, so that the steel bars cannot be pulled axially, and can effectively avoid the bond between the side wall of the steel bars and the concrete from being destroyed and peeling off; through the sleeve 9 and the four second arch plates 11, the radial displacement and deflection of the steel bars are limited, effectively avoiding shear damage to the concrete; in summary, the present invention effectively enhances the bearing capacity of the connection position for the axial and radial loads of the steel bars, and can effectively avoid connection failure.

Claims

1. A construction steel bar sleeve grouting permanent connection device, comprising a cylindrical outer mold (1) and a reinforcement portion located inside the outer mold (1), wherein the outer mold (1) is closed at both ends and has a grouting port (2) at the lower end and a grouting port (3) at the upper end, and a first reinforcement hole (4) is provided at the center of each of the upper and lower end surfaces of the outer mold (1); characterized in that: The strengthening part includes an axial strengthening part and a radial strengthening part. The axial strengthening part includes two L-shaped plates (5). One end of each of the two L-shaped plates (5) is hinged together to form a "C"-shaped structure. A second steel bar passing hole (6) is formed on each of the upper and lower end faces of the "C"-shaped structure. A pressing unit is provided on the opening side of the "C"-shaped structure. The pressing unit includes two internal thread sleeves (7). The end parts of the two internal thread sleeves (7) are respectively hinged to the inner sides of the upper and lower end faces of the "C"-shaped structure, and the two internal thread sleeves (7) are coaxial. The two internal thread sleeves (7) are connected by an external threaded rod (8). The two ends of the external threaded rod (8) are respectively screwed into the internal thread sleeves (7) at the same end, and the thread directions of the external threaded rod (8) and the two internal thread sleeves (7) are opposite; the radial strengthening part includes a sleeve (9) located inside the "C"-shaped structure. The end parts of the two steel bars to be connected respectively pass through the first steel bar passing holes (4) at both ends and the second steel bar passing holes (6) and enter the "C"-shaped structure, and then pass through both ends of the sleeve (9) and are butted inside the sleeve (9).

2. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: A first arched plate (10) is fixed on the outer sides of the upper and lower ends of the "C"-shaped structure, and the concave surfaces of the two first arched plates (10) face away from each other.

3. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: The radial strengthening part further includes four second arched plates (11). The four second arched plates (11) are circumferentially and evenly distributed with the axis of the sleeve (9) as the center, and the concave surfaces of the four second arched plates (11) face outward. Each second arched plate (11) is fixedly connected to the outer wall of the sleeve (9) through a connecting plate (12).

4. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: An alloy block (13) is embedded on each of the upper and lower end faces of the "C"-shaped structure. The hardness of the alloy block (13) is greater than that of the steel bar, and the second steel bar passing hole (6) is formed on the alloy block (13).

5. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: The inner wall of the second steel bar passing hole (6) is provided with pointed teeth (14).

6. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: A section of external hexagon (15) is provided in the middle of the external threaded rod (8) for rotating the external threaded rod (8).

7. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: A sealing ring (16) is provided in the first steel bar passing hole (4).

8. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: The outer mold (1) is of a split structure and is axially cut into two symmetric semi-cylinders, and the two parts are connected by flange bolts.

9. A construction steel bar sleeve grouting permanent connection device according to claim 1, characterized in that: Reinforcing rib plates (17) are welded at the inner corners of the L-shaped plates (5).

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