CN104963453A - Steel bar mechanical connecting sleeve for assembly concrete strong connection - Google Patents

Abstract

The invention discloses a reinforced mechanical connection sleeve for prefabricated concrete strong connection, which comprises a mechanical connection sleeve body with cavities at both ends, and the two ends of the mechanical connection sleeve body are screwed-in sections of steel bars with different diameters , one end is a small-diameter steel bar screw-in section, and the other end is a large-diameter steel bar screw-in section. The inner wall of the cavity of the small-diameter steel bar screw-in section is provided with a threaded button that matches the small-diameter steel bar external thread. The inner wall of the cavity of the screwed-in section of the diameter steel bar is provided with a threaded button that is compatible with the external thread of the large-diameter steel bar, and the threaded button on the inner wall of the cavity of the screwed-in section of the small-diameter steel bar is connected to the hole of the screwed-in section of the large-diameter steel bar. The threads on the inner wall of the cavity are threads in the same direction or forward and reverse directions. The invention can realize the effective transfer of stress between the steel bars through the mechanical engagement between the steel bars and the mechanical connection sleeve body, greatly reduce the anchorage length of the steel bar connections, and can solve the problem of connecting vertical steel bars with different diameters in the assembled concrete strong connection.

Description

A steel bar mechanical connection sleeve for strong connection of prefabricated concrete

technical field

The invention relates to a steel bar mechanical connection sleeve used for strong connection of assembled concrete.

Background technique

With the acceleration of my country's construction industrialization process, many provinces and cities have compiled technical regulations for prefabricated reinforced concrete structures suitable for local conditions. The Ministry of Housing and Urban-Rural Development also issued and implemented the industry standard "Prefabricated Concrete Structures" in 2014 This is of great significance to promote the development of housing industrialization technology.

Guangdong Province also responded to the country's call and will soon implement the provincial standard "Technical Regulations for Prefabricated Concrete Building Structures", which is different from industry standards and introduces "strong connection" into the Guangdong Provincial Standard. "Strong connection" refers to the connection that when the structure reaches the maximum lateral displacement under the earthquake, the components enter the plastic state, while the connection remains in the elastic state. This will make the area of the longitudinal reinforcement near the node area larger than that of the side away from the node area. Since the number of reinforcements is the same, the diameter of the reinforcement near the node area is greater than the diameter of the reinforcement away from the node area. Inspired by the connection problem of longitudinal steel bars with different diameters in "strong connection", in order to solve the connection of steel bars with different diameters, a steel mechanical connection sleeve for the strong connection of prefabricated concrete is particularly important.

Contents of the invention

The purpose of the present invention is to provide a steel bar mechanical connection sleeve for the strong connection of prefabricated concrete, which can solve the connection problem of longitudinal steel bars of different diameters in the strong connection of prefabricated concrete, and ensure that the longitudinal steel bars of different diameters can effectively transmit force.

The purpose of the present invention is achieved by taking the following technical solutions:

A reinforced mechanical connection sleeve for prefabricated concrete strong connection, comprising a mechanical connection sleeve body with cavities at both ends, characterized in that the two ends of the mechanical connection sleeve body are screwed-in sections of steel bars of different diameters , one end is a small-diameter steel bar screw-in section, and the other end is a large-diameter steel bar screw-in section, the inner wall of the cavity of the small-diameter steel bar screw-in section is provided with a threaded button that matches the small-diameter steel bar external thread, the large-diameter steel bar screw-in section The inner wall of the cavity of the section where the diameter steel bar is screwed in is provided with a screw thread matching the external thread of the large diameter steel bar.

As an embodiment of the present invention, the threading of the inner wall of the cavity of the section where the small-diameter steel bar is screwed in and the threading of the inner wall of the cavity of the section where the large-diameter steel bar is screwed in are in the same direction.

As another embodiment of the present invention, the thread on the inner wall of the cavity of the section where the small-diameter steel bar is screwed in and the thread on the inner wall of the cavity of the section where the large-diameter steel bar is screwed into are threads in forward and reverse directions.

The present invention is a reinforced mechanical connecting sleeve for prefabricated concrete strong connection. Its greatest feature is that longitudinal reinforcing bars of different diameters can be connected at both ends, and the reinforcing bar can be realized through the mechanical engagement between the reinforcing bar and the main body of the mechanical connecting sleeve. The effective transfer of inter-stress can solve the connection problem of longitudinal steel bars with different diameters in the prefabricated concrete strong connection.

Description of drawings

Fig. 1 is a structural cross-sectional schematic view of the present invention;

Fig. 2 is a schematic cross-sectional view of an implementation structure of the present invention;

Fig. 3 is a schematic diagram of stress transmission between threads and threads when the present invention is subjected to axial force;

In the figure, 1. Mechanically connect the sleeve body; 2. The screw thread of the inner wall of the cavity where the small diameter steel bar is screwed into the section; 3. The thread button of the inner wall of the cavity where the large diameter steel bar is screwed into the section; 4. The small diameter steel bar is screwed into the 5. Large-diameter steel bars are screwed into the section; 6. Small-diameter steel bars; 7. Large-diameter steel bars.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, the steel bar mechanical connection sleeve used for the prefabricated concrete strong connection of the present invention includes a mechanical connection sleeve body 1 with cavities at both ends, and the two ends of the mechanical connection sleeve body 1 are different The reinforcing bar of diameter is screwed into section, one end is screwed into section 4 of small-diameter steel bar, and the other end is screwed into section 5 of large-diameter steel bar, and the cavity inner wall of described small-diameter steel bar screwed into section 4 is provided with 6 external threads of small-diameter steel bar Matching screw 2, the inner wall of the cavity of the large-diameter steel bar screwed into section 5 is provided with a threaded button 3 compatible with the external thread of the large-diameter steel bar 7, and the cavity inner wall of the small-diameter steel bar screwed into the section The threaded button 2 and the threaded button 3 of the inner wall of the cavity of the large-diameter steel bar screwed into the section are in the same direction or the threaded button in the forward and reverse directions. The key function of the steel bar mechanical connection sleeve of the present invention is that the two ends of the mechanical connection sleeve body 1 will be used to connect the small-diameter steel bar 6 and the large-diameter steel bar 7 respectively.

As shown in Figure 2, the ends of small and large diameter steel bars are first processed into threads. Considering the convenience of construction and connection of steel bars, the ends of small and large diameter steel bars can be processed into threads in the same direction or positive and negative threads. At this time, it is necessary to select the corresponding The steel bar mechanical connection sleeve in the threaded direction; secondly, the steel bar can be screwed in. When the steel bar cannot be moved, the positive and negative threaded mechanical connection sleeve can be selected, and the steel bar thread and the steel bar mechanical connection sleeve are mechanically engaged. The force can achieve effective stress transfer and will greatly reduce the length of the anchorage section of the reinforcement.

As shown in Figure 3, it represents the typical stress characteristics of steel bars under axial compression and tension, respectively. In order to transfer the stress between the steel bars, the mechanical connection between the sleeve body 1 and the threaded fasteners 2 and 3 plays a key role. When the steel bar is stretched, the thread also has a component force F11 in the same direction as the axial force, which can be decomposed into components perpendicular to the thread The force F12 on the thread surface and the force F13 on the parallel thread surface, these two forces will respectively make the threaded thread generate force F22 and F23, which will transfer the stress between the thread and the threaded thread, and then transfer the force to the screw thread through the mechanical connection sleeve body 1. The other end of the steel bar, because the steel bar produces opposite stress under tension, the stress is reliably transmitted between the steel bars.

The present invention is a steel bar mechanical connection sleeve for strong connection of prefabricated concrete. Its biggest feature is that longitudinal steel bars of different diameters can be connected at both ends, and the effective transmission of stress between the steel bars can be realized through mechanical occlusal.

The above-mentioned embodiments are not limiting the protection scope of the present invention, and the embodiments of the present invention are not limited thereto. All these are based on the above-mentioned content of the present invention or according to common technical knowledge and conventional means in this field, without departing from the above-mentioned basic technology of the present invention. Under the ideological premise, other modifications, substitutions or changes made to the above structure of the present invention in various forms shall fall within the scope of protection of the present invention.

Claims (3)

1. A steel bar mechanical connection sleeve for strong connection of prefabricated concrete, comprising a mechanical connection sleeve body with cavities at both ends, characterized in that the two ends of the mechanical connection sleeve body are screwed by steel bars of different diameters One end is the screw-in section of the small-diameter steel bar, and the other end is the screw-in section of the large-diameter steel bar. The inner wall of the cavity of the small-diameter steel bar screw-in section is provided with a threaded button that matches the external thread of the small-diameter steel bar. The inner wall of the cavity of the screw-in section of the large-diameter steel bar is provided with a threaded button matching the external thread of the large-diameter steel bar. 2. The steel bar mechanical connection sleeve for prefabricated concrete strong connection according to claim 1, characterized in that, the screw on the inner wall of the cavity of the small-diameter steel bar is screwed into the section and the large-diameter steel bar is screwed into The threads on the inner wall of the cavity of the segment are threads in the same direction. 3. The steel bar mechanical connection sleeve for prefabricated concrete strong connection according to claim 1, characterized in that, the screw thread on the cavity inner wall of the small-diameter steel bar is screwed into the section and the large-diameter steel bar is screwed into The threads on the inner wall of the cavity of the segment are threads in forward and reverse directions.