A building prefabricated component connecting structure

Abstract

The utility model provides a kind of prefabricated component connecting structure for building, including pouring sleeve, grouting pipe orifice, discharge pipe orifice, grout blocking plug, grout guide line, upper prefabricated component reinforcement and lower prefabricated component reinforcement, grouting pipe orifice and discharge pipe orifice are integrally provided on the pouring sleeve, wherein grout blocking plug is threadedly installed on the discharge pipe orifice;Grout guide line is provided on the pouring sleeve inner wall, and the upper prefabricated component reinforcement and the lower prefabricated component reinforcement are inserted into the pouring sleeve oppositely;The utility model grout guide line is guided by inner wall thread, and the compactness is improved;Grout blocking plug dynamically switches channel length, distinguishes filling state to avoid misjudgment;Grouting port and discharge pipe orifice are arranged in parallel, cooperate grout guide line to shorten time, reduce waste, reduce hidden danger, and enhance connection strength.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated component connection technology, and in particular relates to a connection structure for prefabricated building components. Background Technology

[0002] In the field of industrialized construction, precast component connection structures are one of the core technologies of prefabricated buildings, and their reliability directly affects the safety and stability of the overall structure. Currently, grouted steel sleeve connection structures are widely used in prefabricated concrete structures due to their advantages such as convenient construction and high connection strength. This structure mainly achieves stress transfer in the steel reinforcement by injecting cement-based grout inside the sleeve and utilizing the bonding force, friction, and mechanical interlocking force formed between the sleeve and the steel reinforcement after the grout solidifies.

[0003] However, existing technologies suffer from the following problems that urgently need to be addressed: Traditional rebar sleeves typically lack a dedicated grout guiding structure, resulting in a lack of directional flow of the grout within the sleeve. This leads to uneven distribution, residual air bubbles, or localized voids, affecting the density of the connection interface. Furthermore, during grout injection, grout often overflows from the discharge pipe before completely filling the sleeve due to poor air removal or insufficient filling pressure. This can cause operators to misjudge the filling status and prematurely stop grouting, resulting in incomplete filling of the sleeve and creating safety hazards.

[0004] Therefore, it is essential to invent a connection structure for prefabricated building components. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a connection structure for precast building components, including a casting sleeve, a grouting port, a grout discharge port, a grout-blocking plug, a grout guiding pattern, upper precast component reinforcing bars, and lower precast component reinforcing bars. The casting sleeve is integrally provided with a grouting port and a grout discharge port, wherein a grout-blocking plug is threaded onto the grout discharge port; the inner wall of the casting sleeve is provided with a grout guiding pattern, and the upper and lower precast component reinforcing bars are inserted into the casting sleeve relative to each other.

[0006] Preferably, the casting sleeve and the upper precast component reinforcement are embedded in the same precast building component, wherein the ports of the grouting pipe and the grout discharge pipe provided on the casting sleeve extend outside the precast component, and the lower end of the upper precast component reinforcement extends into the casting sleeve.

[0007] Preferably, the lower opening of the casting sleeve allows the upper end of the lower precast component reinforcement to be inserted. The lower precast component reinforcement is embedded in another precast building component, with its upper end protruding outwards. The lower precast component reinforcement and the upper precast component reinforcement are located on the same vertical line, with a gap between their ends and without contact or interference.

[0008] Preferably, the inner wall of the casting sleeve is provided with a threaded casting sleeve, and the grout guiding pattern is a threaded protrusion structure, so that the grout guiding pattern does not interfere with the reinforcing bars of the lower precast component and the upper precast component.

[0009] Preferably, the grouting port on the casting sleeve is located below the grout discharge port, and the two are arranged parallel to each other, allowing the injection and discharge of grout.

[0010] Preferably, the slurry-blocking plug installed internally by the slurry discharge pipe includes a plugging head, a spring, a ball head, a slide cylinder, a slide groove, and a venting and slurry discharge hole. The plugging head is connected to the slurry discharge pipe thread by its own external thread. One end of the plugging head is elastically connected to the ball head by the spring. The slide cylinder fixedly installed on the ball head slides together with the slide groove provided on the plugging head. Both the plugging head and the ball head are provided with venting and slurry discharge holes.

[0011] Preferably, the blocking head has a "T" shaped structure, and one end of the blocking head that extends into the slurry discharge pipe is elastically connected to the ball head by a spring. The venting and slurry discharge holes provided by the blocking head and the ball head together with the slide cylinder form a venting and slurry discharge channel.

[0012] Preferably, the slide is located inside the spring, the diameter of the spring is larger than the diameter of the slide, and the diameter of the slide is smaller than the diameter of the blocking head and the ball head.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The spiral grout guide pattern on the inner wall of the casting sleeve of this utility model can guide the grout to form a spiral flow path in the sleeve, so as to promote the grout to fill the gap between the sleeve and the reinforcing bar evenly, reduce air bubbles and local voids, significantly improve the grout density, and enhance the mechanical interlocking force and bonding strength between the reinforcing bar and the sleeve.

[0015] This invention uses a grout-blocking plug to dynamically switch the length of the channel. Initially, the long channel restricts grout discharge and only vents air (air bubbles / thin grout overflow). When the channel is full, the short channel discharges thick grout (stabilizing the grout flow), clearly distinguishing the filling state and avoiding misjudgment. It is suitable for multiple scenarios and is easy to operate. It ensures the "vent air first, then grout discharge" sequence, reduces voids, and improves the grout density and the connection strength between the reinforcing bar and the sleeve.

[0016] This utility model features parallel arrangement of the grouting pipe and the grout discharge pipe, with the grouting port located below, forming a reasonable grout flow path. Combined with the grout guiding texture, it shortens the grouting time and reduces grout waste. The sliding fit structure of the slide cylinder and the slide groove ensures stable movement of the ball head. The venting and grout discharge holes and the slide cylinder together form a through channel, ensuring smooth venting and preventing grout overflow when not fully filled. This makes the grouting process more controllable and significantly reduces potential construction quality risks. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a half-sectional structural diagram of the present invention.

[0019] Figure 3 This is a utility model Figure 2 A magnified schematic diagram of the structure at point A.

[0020] In the picture:

[0021] 1. Casting sleeve; 2. Grouting pipe opening; 3. Grout discharge pipe opening; 4. Grout blocking plug; 41. Blocking head; 42. Spring; 43. Ball head; 44. Sliding cylinder; 45. Sliding groove; 46. Vent and grout discharge hole; 5. Grout guiding texture; 6. Upper precast component reinforcement; 7. Lower precast component reinforcement. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] In the description of the embodiments, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in the present utility model based on the specific circumstances.

[0024] As attached Figure 1 To be continued Figure 3 As shown:

[0025] This utility model provides a connection structure for precast building components, including a casting sleeve 1, a grouting port 2, a grout discharge port 3, a grout-blocking plug 4, a grout guiding pattern 5, an upper precast component reinforcing bar 6, and a lower precast component reinforcing bar 7. The casting sleeve 1 is integrally provided with the grouting port 2 and the grout discharge port 3, wherein the grout discharge port 3 is threaded with a grout-blocking plug 4; the inner wall of the casting sleeve 1 is provided with a grout guiding pattern 5, and the upper precast component reinforcing bar 6 and the lower precast component reinforcing bar 7 are inserted into the casting sleeve 1 relative to each other.

[0026] Furthermore, the casting sleeve 1 is a cylindrical hollow metal component, which is pre-embedded in the upper precast component together with the reinforcing steel 6 of the upper precast component. The upper end of the sleeve is closed and the lower end is open. The sleeve wall is provided with grouting pipe port 2 and grout discharge pipe port 3, and the port extends out of the surface of the precast component for operation. The lower end of the reinforcing steel 6 of the upper precast component extends into the casting sleeve 1, maintaining a gap with the sleeve wall, and forms a mechanical interlock with the grout through the grout guiding grooves 5 on the inner wall of the sleeve.

[0027] Furthermore, the lower opening of the casting sleeve 1 allows the upper end of the lower precast component reinforcing bar 7 to be vertically inserted. The lower precast component reinforcing bar 7 is embedded in the lower precast component and extends out at its upper end. The axes of the upper precast component reinforcing bar 6 and the lower precast component reinforcing bar 7 coincide, and their ends maintain a distance and do not contact each other. The top surface of the lower precast component is provided with a positioning structure that matches the lower end of the sleeve to ensure alignment accuracy.

[0028] Furthermore, the inner wall of the casting sleeve 1 is provided with threaded protrusions for guiding grout 5. The spiral direction of the guiding grout 5 is at a helical angle to the axis of the casting sleeve 1, and its radial height is less than the gap between the inner wall of the sleeve and the reinforcing bar, ensuring that it does not contact the reinforcing bar. The guiding grout 5 guides the grout to flow spirally along the inner wall of the casting sleeve 1, improving the uniformity of filling. The spiral angle of the guiding grout 5 is 15°-30°, and the pitch is 10-15mm, guiding the grout to form a rotating flow field.

[0029] Furthermore, both the grouting port 2 and the grout discharge port 3 are tubular structures connected to the wall of the casting sleeve 1. The grouting port 2 is located below the grout discharge port 3 and the two are parallel. The grouting port 2 serves as the grout inlet, and the grout discharge port 3 serves as the outlet for gas and excess grout. The inner wall of the port is provided with internal threads for connecting the grouting equipment and the grout blocking plug 4.

[0030] Furthermore, the slurry-blocking plug 4, which is internally threaded and installed in the slurry discharge pipe 3, includes a plug head 41, a spring 42, a ball head 43, a slide cylinder 44, a slide groove 45, and a venting and slurry discharge hole 46. The plug head 41 is threadedly connected to the slurry discharge pipe 3 through its own external thread. One end of the plug head 41 is elastically connected to the ball head 43 through the spring 42. The slide cylinder 44, which is fixedly installed on the ball head 43, slides together with the slide groove 45 provided on the plug head 41. Both the plug head 41 and the ball head 43 are provided with venting and slurry discharge holes 46.

[0031] Furthermore, the blocking head 41 has an overall "T" shaped structure. Its horizontal section is externally threaded and connected to the slurry discharge port 3, while its vertical section extends into the slurry discharge port 3 and is connected to the ball head 43 via a spring 42. The venting and slurry discharge hole 46 of the blocking head 41 extends from the top surface of the horizontal section to the end face of the vertical section, and the venting and slurry discharge hole 46 of the ball head 43 extends from the bottom surface to the spherical surface. When the slide cylinder 44 is inserted into the slide groove 45, the venting and slurry discharge hole 46 of the blocking head 41, the internal cavity of the slide cylinder 44, and the venting and slurry discharge hole 46 of the ball head 43 are connected to form a continuous venting and slurry discharge channel of "blocking head 41-slide cylinder 44-ball head 43", ensuring that air or slurry can flow along the axial direction.

[0032] Furthermore, the slide cylinder 44, labeled 44, is located inside the spring 42, labeled 42. The outer diameter of the spring 42 is larger than the outer diameter of the slide cylinder 44, forming a coaxial layout of "spring 42 sleeve slide cylinder 44". The spring 42 provides radial guidance for the sliding of the slide cylinder 44, preventing the ball head 43 from shifting during movement. The outer diameter of the slide cylinder 44 is smaller than the inner diameter of the vertical section of the blocking head 41 and the diameter of the ball head 43, ensuring that the slide cylinder 44 can be fully embedded in the slide groove 45, and that there is no jamming when the ball head 43 contacts the end face of the blocking head 41, ensuring smooth switching of the exhaust and slurry discharge channels.

[0033] The working principle is as follows: First, when it is necessary to connect the upper and lower precast components, the lower precast component steel bar 7 extending from the lower precast component is aligned with the lower end opening of the casting sleeve 1 and inserted vertically, so that the upper precast component steel bar 6 and the lower precast component steel bar 7 are coaxial and their ends do not touch; at this time, the casting sleeve 1 in the upper precast component has been pre-embedded, and the ports of its grouting pipe 2 and grout discharge pipe 3 are exposed outside the precast component, which facilitates the subsequent grouting operation.

[0034] Subsequently, cement-based grout is injected into the grouting pipe 2 through the grouting equipment. Under pressure, the grout enters the interior of the casting sleeve 1. Because the inner wall of the sleeve has a spiral grout guiding pattern 5, the grout is guided by the pattern to spirally rise and flow along the inner wall of the sleeve. This spiral path can effectively fill the gap between the sleeve and the upper precast component steel bar 6 and the lower precast component steel bar 7, avoiding air bubbles or local voids caused by uneven flow of the grout, and improving the filling density.

[0035] In the initial state (without grouting), the spring 42 is in a naturally extended state, pushing the ball head 43 away from the blocking head 41, and most of the slide cylinder 44 is exposed outside the groove 45 of the blocking head 41. At this time, the venting and grouting channel is composed of the venting and grouting hole 46 of the blocking head 41, the venting and grouting hole 46 of the ball head 43, and the internal space of the slide cylinder 44 connected in series, forming a long path, small cross-sectional area channel (the path length is the exposed length of the slide cylinder 44 + the distance between the ball head 43 and the blocking head 41).

[0036] In the initial stage of grouting (air discharge stage), after the grout is injected through the grouting pipe 2, the air inside the casting sleeve 1 is squeezed by the grout and moves towards the grout discharge pipe 3. Due to the long initial channel and small cross-sectional area, the air can only be discharged slowly through the tiny channel (manifested as intermittent overflow of air bubbles), while the unfilled grout cannot be continuously discharged because it has not reached the height of the grout discharge pipe 3, or even if it comes into contact with the channel, it cannot be discharged continuously due to the large flow resistance (long path + small cross-sectional area).

[0037] During the grouting completion stage (grout discharge stage), when the grout completely fills the sleeve and reaches the grout discharge port 3, the grout pressure exceeds the initial elastic force of the spring 42 (designed to be slightly lower than the grouting pressure), pushing the ball head 43 to compress the spring 42 and move backward. Simultaneously, the slide cylinder 44 is retracted into the chute 45. At this time, the ball head 43 is close to the blocking head 41, shortening the path length of the venting and grout discharge channel (only the venting and grout discharge holes 46 of the blocking head 41 and the ball head 43 are retained), forming a short-path, small-cross-sectional area channel. High-viscosity grout is continuously and thickly discharged through the short channel (manifesting as a stable grout flow without air bubbles). The operator can determine that filling is complete by observing this state.

[0038] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solution described in this utility model, or by designing a similar technical solution inspired by the technical solution described in this utility model, falls within the protection scope of this utility model.

Claims

1. A connection structure for prefabricated building components, characterized in that, The casting sleeve (1) includes a grouting pipe (2), a grout discharge pipe (3), a grout blocking plug (4), a grout guiding pattern (5), an upper precast component reinforcing bar (6), and a lower precast component reinforcing bar (7). The casting sleeve (1) is integrally provided with a grouting pipe (2) and a grout discharge pipe (3), and a grout blocking plug (4) is threaded on the grout discharge pipe (3). The inner wall of the casting sleeve (1) is provided with a grout guiding pattern (5), and the upper precast component reinforcing bar (6) and the lower precast component reinforcing bar (7) are inserted into the casting sleeve (1) relative to each other.

2. The prefabricated component connection structure for building as described in claim 1, characterized in that: The casting sleeve (1) and the upper precast component steel bar (6) are embedded in the same building precast component. The ports of the grouting pipe (2) and the grout discharge pipe (3) provided on the casting sleeve (1) extend out of the precast component, and the lower end of the upper precast component steel bar (6) extends into the casting sleeve (1).

3. The prefabricated component connection structure for building as described in claim 2, characterized in that: The lower opening of the casting sleeve (1) allows the upper end of the lower precast component steel bar (7) to be inserted. The lower precast component steel bar (7) is embedded in another precast building component, with its upper end protruding outward. The lower precast component steel bar (7) and the upper precast component steel bar (6) are located on the same vertical line, with a gap between their ends and they do not contact or interfere with each other.

4. The prefabricated component connection structure for building as described in claim 3, characterized in that: The casting sleeve (1) provided on the inner wall of the casting sleeve (1) has a threaded protrusion structure, and the grout guiding pattern (5) does not interfere with the lower precast component reinforcement (7) and the upper precast component reinforcement (6).

5. A prefabricated component connection structure for building as described in claim 4, characterized in that: The grouting port (2) provided on the casting sleeve (1) is located below the grout discharge port (3), and the two are arranged parallel to each other. The grouting port (2) and the grout discharge port (3) allow the injection and discharge of grout.

6. The prefabricated component connection structure for building as described in claim 5, characterized in that: The slurry-blocking plug (4) installed in the internal thread engagement of the slurry discharge pipe (3) includes a plug (41), a spring (42), a ball (43), a slide (44), a groove (45), and an exhaust and slurry discharge hole (46). The plug (41) is connected to the slurry discharge pipe (3) by its own external thread engagement. One end of the plug (41) is elastically connected to the ball (43) by the spring (42). The slide (44) fixedly installed on the ball (43) slides together with the groove (45) provided on the plug (41). The exhaust and slurry discharge hole (46) is provided through both the plug (41) and the ball (43).

7. A prefabricated component connection structure for building as described in claim 6, characterized in that: The blocking head (41) has a "T" shaped structure. One end of the blocking head (41) that extends into the slurry discharge pipe (3) is elastically connected to the ball head (43) through a spring (42). The venting and slurry discharge holes (46) provided on the blocking head (41) and the ball head (43) together with the slide cylinder (44) form an venting and slurry discharge channel.

8. A prefabricated component connection structure for building as described in claim 7, characterized in that: The slide (44) is located inside the spring (42), the diameter of the spring (42) is larger than the diameter of the slide (44), and the diameter of the slide (44) is smaller than the diameter of the blocking head (41) and the ball head (43).

Images