Hoop prestress self-adjusting deformation grouting sleeve joint

Abstract

The utility model discloses a hoop prestress self-adjusting deformation grouting sleeve joint, and belongs to the technical field of fabricated buildings. Comprising a self-adjusting deformation sleeve and a hoop, the self-adjusting deformation sleeve is formed by buckling two arc-shaped plates together, the buckling connector of the arc-shaped plates is of a tongue-and-groove structure, a grouting hole is formed in one end of the self-adjusting deformation sleeve, and a grout outlet hole is formed in the other end of the self-adjusting deformation sleeve. The hoop is hooped on the outer wall of the self-adjusting deformation sleeve through a fastener; the self-adjusting deformation sleeve and the hoop are combined and connected through a tongue-and-groove structure, so that the inner diameter of the sleeve can be adjusted, stronger active restraining force can be provided, and the flexibility and adaptability of construction are improved; the problems that a sleeve with a fixed size is poor in construction flexibility and cannot be actively adjusted are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of assembled buildings, in particular to a hoop prestressed self-adjusting deformation grouting sleeve joint. Background Art

[0002] Prefabricated buildings are a fast, efficient and environmentally friendly construction method and have been widely used. However, there are several problems with the steel sleeve grouting connection in prefabricated concrete structures:

[0003] 1. Fixed-size sleeves lead to poor construction flexibility

[0004] The existing grouting sleeves for steel bar connections are pre-made according to the design and use requirements, and the sleeve size is fixed, which leads to poor construction flexibility. During the construction process, the fixed-size sleeve cannot adapt to slight changes in site conditions, such as position deviation of steel bars.

[0005] 2. The sleeve provides passive restraint and cannot be actively adjusted

[0006] The shape and size of the existing grouting sleeves have been determined during design and manufacturing. The sleeve diameter cannot be actively adjusted and cannot be deformed. Therefore, the sleeve can only provide limited constraints on the grouting material. The constraints are passive and depend on the expansion of the grouting material. Expansion agents are added to the configuration of the grouting material. The grouting material hardens and expands. After the grouting material expands slightly, the volume increases, and the sleeve will constrain the grouting material. However, the size of the constraint depends on the expansion of the grouting material. This constraint is limited and cannot be actively adjusted. Utility Model Content

[0007] The utility model overcomes the shortcomings of the prior art and proposes a hoop prestressed self-adjusting deformable grouting sleeve joint to solve the problem that the fixed-size sleeve has poor construction flexibility and cannot be actively adjusted.

[0008] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.

[0009] A hoop prestressed self-adjusting deformable grouting sleeve joint comprises a self-adjusting deformable sleeve and a hoop; the self-adjusting deformable sleeve is composed of two arc plates buckled together, the buckling interface of the arc plates is a tongue-and-groove structure, one end of the self-adjusting deformable sleeve is provided with a grouting hole, and the other end of the self-adjusting deformable sleeve is provided with a grouting hole; the hoop is clamped on the outer wall of the self-adjusting deformable sleeve by a fastener.

[0010] Furthermore, the arc-shaped plate is a semicircular structure, and two arc-shaped plates are buckled together to form a cylindrical self-adjusting deformation sleeve.

[0011] Furthermore, the grouting hole is arranged on the side wall of the self-adjusting deformable sleeve close to the bottom; the grouting hole is arranged on the side wall of the self-adjusting deformable sleeve close to the top.

[0012] Furthermore, an outer wall of the self-adjusting deformable sleeve is provided with an arc-shaped groove, and the ring hoop is clamped in the arc-shaped groove.

[0013] Furthermore, the outer wall of the self-adjusting deformable sleeve is provided with arc-shaped grooves at the upper and lower parts, and two hoops are respectively clamped in the upper and lower arc-shaped grooves.

[0014] Furthermore, one side of the self-adjusting deformation sleeve is connected to a joint end of a reserved steel bar, and the joint end of the steel bar is then inserted into the self-adjusting deformation sleeve.

[0015] Furthermore, the joint end portions of the reserved steel bars and the joint end portions of the later inserted steel bars are pier structures.

[0016] Furthermore, the self-adjusting deformation sleeve is formed by cutting the seamless steel pipe from the middle along the axial direction, and a tongue-and-groove structure is formed at the cut.

[0017] Furthermore, both ends of the hoop are connected by fasteners respectively.

[0018] Furthermore, the fasteners are connected bolts and nuts.

[0019] The beneficial effects of the utility model compared with the prior art are:

[0020] 1. Improve construction flexibility: The self-adjusting deformation sleeve of the utility model is a variable sleeve, which is composed of two pieces, and the two pieces of the sleeve are connected by a tongue-and-groove structure. The inner diameter of the sleeve can be adjusted within a certain range, and the inner diameter can be increased to adapt to the position deviation of the steel bar, thereby improving the flexibility and adaptability of the construction. The self-adjustment can compensate for the component connection deviation caused by factors such as steel bar installation error.

[0021] 2. The sleeve provides stronger active restraint: The hoop prestressed self-adjusting deformation grouting sleeve joint uses prestressing technology and sleeve self-adjusting technology to apply a certain prestress on the sleeve, so that it can produce stronger active restraint on the grouting material.

[0022] With the sleeve self-adjustment technology, during the grouting process, the sleeve will increase in diameter due to the injection of the grouting material. After the grouting material hardens and expands, the sleeve diameter will increase moderately due to the expansion of the grouting material. The sleeve is prestressed by the hoop. As the bolts and nuts are tightened, the sleeve diameter decreases. The two sleeves will exert a restraining force on the grouting material. The reduction in sleeve diameter, combined with the hardening and expansion of the grouting material, means that a tight interface is formed between the sleeve and the grouting material. In this way, the sleeve can exert an effective restraining force on the hardened grouting material, thereby enhancing the overall structural strength of the joint.

[0023] This restraining force is active. This restraining force is not passively generated by the expansion of the grouting material after hardening, but is actively formed by the pressure of the hoop.

[0024] This restraining force is adjustable. The restraining force is provided by the ring hoop squeezing the sleeve, and the size of the sleeve restraining force can be adjusted by adjusting the degree of tightening of the ring hoop.

[0025] It is very meaningful and has great engineering application prospects to apply prestressing technology and sleeve self-adjusting technology to steel sleeve grouting lap joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view of the sleeve joint of the utility model;

[0027] Figure 2 The structure of the sleeve joint of the utility model is shown in FIG. Figure 1 ;

[0028] Figure 3 The structure of the sleeve joint of the utility model is shown in FIG. Figure 2 ;

[0029] Figure 4 is a schematic diagram of the structure of the hoop;

[0030] Figure 5 It is a schematic diagram of the structure of bolts and nuts;

[0031] Figure 6 It is a structural schematic diagram of a self-adjusting deformation sleeve;

[0032] Figure 7 It is a structural diagram of reserved steel bars and later inserted steel bars;

[0033] Figure 8 It is a schematic diagram of the tongue-and-groove structure;

[0034] In the figure:

[0035] 1-reserved steel bars, 2-later inserted steel bars, 3-thick end of steel bar pier, 4-self-adjusting deformation sleeve, 5-grouting hole, 6-grouting hole, 7-arc groove, 8-hoop, 9-bolt, 10-nut, 11-tongue and groove structure. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0037] like Figure 1-8 As shown, this embodiment provides a hoop prestressed self-adjusting deformable grouting sleeve joint, including a self-adjusting deformable sleeve 4 and two hoop 8; the self-adjusting deformable sleeve 4 is formed by cutting a seamless steel pipe from the middle along the axial direction and buckling together two semicircular arc plates, and a tongue-and-groove structure 11 is formed at the cut. A grouting hole 5 is provided on the side wall of the self-adjusting deformable sleeve 4 near the bottom, and a slurry outlet hole 6 is provided on the side wall of the self-adjusting deformable sleeve 4 near the top; the upper and lower outer walls of the self-adjusting deformable sleeve 4 are respectively provided with arc grooves 7, and the two hoop 8 are respectively clamped in the upper and lower arc grooves 7. The hoop 8 is clamped on the outer wall of the self-adjusting deformable sleeve 4 by a fastener.

[0038] Furthermore, both ends of the hoop 8 are connected by fasteners, which are connected bolts 9 and nuts 10.

[0039] The production and use methods of grouting sleeve joints are:

[0040] The first step: the anchorage end of the reserved steel bar 1 and the anchorage end of the later inserted steel bar 2 are respectively upset by a steel bar upsetting machine in advance, so that the diameter of the steel bar in the processing section is increased to form a steel bar upsetting end 3;

[0041] Step 2: Making the self-adjusting deformation sleeve 4: Using a seamless steel pipe, cold-processing the two ends of the seamless steel pipe by rolling process, making two annular arc grooves 7 on the outer wall of the seamless steel pipe, cutting the seamless steel pipe from the middle along the axial direction to form a tongue-and-groove structure 11, and the two cut parts of the steel pipe form the self-adjusting deformation sleeve 4, and the two semicircular arc plates constituting the self-adjusting deformation sleeve 4 are connected by the tongue-and-groove structure 11;

[0042] Step 3: First, spot weld the reserved steel bar 1 at both ends of the cylinder wall of a semicircular arc plate to fix the position of the reserved steel bar 1;

[0043] Step 4: placing the rear inserted steel bar 2 in the self-adjusting deformation sleeve 4;

[0044] Step 5: Inject grouting material from the grouting hole 5 and stop grouting when the grout overflows from the grout outlet hole 6.

[0045] Step 6: Maintenance.

[0046] Step 7: Apply prestress by post-tensioning method without connection. When the strength of the grouting material inside the sleeve reaches 75% of the design strength, the hoop 8 is clamped in the arc groove 7, and the prestress is applied by the hoop 8. By tightening the bolts 9 and nuts 10, the hoop 8 is closely fitted to the outer wall of the self-adjusting deformation sleeve 4, and lateral pressure is applied to the outer wall of the self-adjusting deformation sleeve 4.

[0047] In this embodiment, the self-adjusting deformation sleeve 4 is a variable sleeve, which is composed of two semicircular arc plates, which are connected by a tongue-and-groove structure 11, so that the inner diameter of the self-adjusting deformation sleeve 4 can be adjusted within a certain range, and the inner diameter can be increased to adapt to the position deviation of the steel bar, thereby improving the flexibility and adaptability of the construction. The self-adjustability can compensate for the component connection deviation caused by factors such as the steel bar installation error.

[0048] During the grouting process, the diameter of the self-adjusting deformable sleeve 4 will increase due to the injection of the grouting material. After the grouting material hardens and expands, the diameter of the self-adjusting deformable sleeve 4 will increase moderately due to the expansion of the grouting material. The self-adjusting deformable sleeve 4 is prestressed by the hoop 8. As the bolts 9 and the nuts 10 are tightened, the diameter of the self-adjusting deformable sleeve 4 decreases. The self-adjusting deformable sleeve 4 will exert a restraining force on the grouting material. The reduction in the diameter of the self-adjusting deformable sleeve 4, combined with the hardening and expansion of the grouting material, means that a tight interface is formed between the self-adjusting deformable sleeve 4 and the grouting material. In this way, the self-adjusting deformable sleeve 4 can exert an effective restraining force on the hardened grouting material, thereby enhancing the overall structural strength of the joint. This restraining force is not passively generated due to the expansion of the grouting material after hardening, but is actively formed by the pressure of the hoop 8. The restraining force is provided by the hoop 8 squeezing the sleeve, and the size of the sleeve restraining force is adjusted by adjusting the degree to which the hoop 8 is tightened.

[0049] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.

Claims

1. A hoop prestressed self-adjusting deformation grouting sleeve joint, characterized in that: The invention comprises a self-adjusting deformable sleeve (4) and a hoop (8); the self-adjusting deformable sleeve (4) is composed of two arc-shaped plates buckled together, the buckling interface of the arc-shaped plates is a tongue-and-groove structure (11), one end of the self-adjusting deformable sleeve (4) is provided with a grouting hole (5), and the other end of the self-adjusting deformable sleeve (4) is provided with a grouting hole (6); the hoop (8) is clamped on the outer wall of the self-adjusting deformable sleeve (4) by a fastener.

2. A hoop prestressed self-adjusting deformation grouting sleeve joint according to claim 1, characterized in that: The arc-shaped plate is a semicircular structure, and the two arc-shaped plates are buckled together to form a cylindrical self-adjusting deformation sleeve (4).

3. The prestressed self-adjusting deformation grouting sleeve joint according to claim 1 is characterized in that: The grouting hole (5) is arranged on the side wall of the self-adjusting deformable sleeve (4) close to the bottom; and the grouting hole (6) is arranged on the side wall of the self-adjusting deformable sleeve (4) close to the top.

4. The prestressed self-adjusting deformation grouting sleeve joint according to claim 1 is characterized in that: The outer wall of the self-adjusting deformable sleeve (4) is provided with an arc-shaped groove (7), and the hoop (8) is clamped in the arc-shaped groove (7).

5. The prestressed self-adjusting deformation grouting sleeve joint according to claim 4 is characterized in that: The outer wall of the self-adjusting deformable sleeve (4) is provided with arc-shaped grooves (7) at the top and bottom, respectively, and two hoops (8) are respectively clamped in the upper and lower arc-shaped grooves (7).

6. The prestressed self-adjusting deformation grouting sleeve joint according to claim 1 is characterized in that: One side of the self-adjusting deformable sleeve (4) is connected to a joint end of a reserved steel bar (1), and the joint end of the rear inserted steel bar (2) is inserted into the self-adjusting deformable sleeve (4).

7. The prestressed self-adjusting deformation grouting sleeve joint according to claim 6 is characterized in that: The joint end of the reserved steel bar (1) and the joint end of the later inserted steel bar (2) are pier structures.

8. The hoop prestressed self-adjusting deformation grouting sleeve joint according to claim 1, characterized in that: The self-adjusting deformation sleeve (4) is formed by cutting a seamless steel pipe in the middle along the axial direction, and a tongue-and-groove structure (11) is formed at the cut.

9. The prestressed self-adjusting deformation grouting sleeve joint according to claim 1, characterized in that: The two ends of the hoop (8) are connected by fasteners respectively.

10. A hoop prestressed self-adjusting deformation grouting sleeve joint according to claim 1 or 9, characterized in that: The fasteners are connected bolts (9) and nuts (10).

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