Controllable anti-tilt swivel ball joint

Abstract

The present invention discloses a controllable anti-overturning swivel ball joint, including a ball joint bracket, a lower ball joint, a limit pin and an upper ball joint. The lower ball joint is fixed on the ball joint bracket, the upper ball joint is coaxially and longitudinally stacked above the lower ball joint, the upper ball joint and the lower ball joint are spherically rotated and assembled, the limit pin is fixed at the center of the lower ball joint, the upper ball joint is provided with a limit hole for the limit pin to be inserted, the limit pin is a steel tube concrete structure, the upper ball joint is a circular convex spherical structure, and the lower ball joint is a circular concave spherical structure adapted to the upper ball joint. Compared with the prior art, the upper ball joint and the lower ball joint of the present invention are arranged in a hollow circular ring shape as a whole, and a narrower cross section can be achieved under the same bearing capacity, which is more conducive to ensuring the density of the concrete pouring at the bottom; the overall plane structure of the controllable anti-overturning swivel ball joint is annular, which is conducive to backfilling and sealing the center part after the rotation operation is completed, ensuring the safe use of the bridge in the later stage.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a controllable anti-overturning swivel ball joint. Background Art

[0002] A rotating bridge is a bridge constructed using the rotation method. Specifically, it refers to the part of the bridge that crosses a river, highway, or railway, with the entire span divided into two parts, which are constructed on both sides of the river or road. The superstructure of the bridge is completed at the construction site, and then the beams on both sides of the river or road are rotated to the bridge working site, and the two parts are combined into an integral bridge at the working site. The bridge rotation technology can convert operations above obstacles into operations on the shore or near the ground, which can not only ensure the safety of engineering construction, but also reduce the impact on traffic, shorten the closure time and reduce construction costs. With the vigorous development of transportation construction projects in recent years, more and more new bridge projects have crossed with existing highways, railway lines and rivers. In view of the high safety of the rotation method and its small impact on traffic, the vast majority of new cross-line bridges are currently constructed using the rotation method.

[0003] At present, the common bridge rotation device is mainly composed of slides, support legs, center ball joints or rotation bearings. The existing rotation bridge project drives the bridge from the construction site to the working site through the rotation of the center ball joint or rotation bearing, and the gap between the pedestals is backfilled with concrete after the rotation operation is completed. The ball joint or rotation bearing is located at the rotation center of the pedestal of the rotation structure, bearing the main structural load. The rotation axis set at the center of the bearing plays a role in limiting the excessive vertical rotation angle and resisting overturning to a certain extent. Due to the late appearance of the rotation method construction technology, the relevant standards and specifications for the rotation method construction technology are still not perfect. For example, the Ministry of Transport standard "Technical Specifications for Highway Bridge and Culvert Construction" (JTG / T F50-2011) only requires the main technical indicators of the rotation method construction. However, in addition to the requirements of standards and specifications, there are still some common defects in the installation and use of swivel devices: when using ball joints, the spherical surface of the lower spherical joint needs to be used as a template when pouring the concrete of the lower pedestal, and it is very easy to have air holding and incomplete pouring during the pouring process; when using swivel bearings, the plane diameter of large-tonnage bearings is large, and it is difficult to ensure complete density when pouring the bottom leveling layer; when using ball joints or swivel bearings, after the rotation operation is completed, concrete can only be backfilled to the area outside the ball joint or swivel bearing, and the core part cannot be poured. The ball joint or swivel bearing sets a rotating shaft in the center of the structure to resist the unbalanced moment of the rotating structure. However, due to the small lever arm of the rotating shaft, the rotating shaft cannot play a practical role when the overturning moment of the structure is large. These all leave certain safety hazards for the rotation operation and service use of the bridge. Summary of the invention

[0004] The purpose of the present invention is to provide a controllable anti-overturning swivel ball joint to solve the technical problems of the swivel device such as incomplete casting, incomplete backfilling and sealing, and weak anti-overturning ability.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention discloses a controllable anti-overturning swivel ball joint, comprising a ball joint bracket, a lower ball joint, a limit pin and an upper ball joint, wherein the lower ball joint is fixed on the ball joint bracket, the upper ball joint is coaxially and longitudinally stacked above the lower ball joint, the upper ball joint and the lower ball joint are spherically rotatably assembled, the limit pin is fixed at the center position of the lower ball joint, the upper ball joint is provided with a limit hole for inserting the limit pin, the limit pin is a steel tube concrete structure, the upper ball joint is a circular convex spherical structure, and the lower ball joint is a circular concave spherical structure adapted to the upper ball joint.

[0007] Preferably, it also includes an annular slide, which is located between the lower ball joint and the upper ball joint and embedded in the lower ball joint. The lower ball joint is provided with a slide groove for installing the annular slide, and the upper ball joint and the lower ball joint are rotatably assembled through the annular slide.

[0008] Preferably, it also includes a sealing ring, which is located between the lower ball joint and the upper ball joint and embedded in the lower ball joint. The lower ball joint is provided with a sealing ring groove for installing the sealing ring, and the sealing ring groove is annularly sleeved on the inner side and / or outer side of the slide plate groove.

[0009] Preferably, it also includes a top plate, which is installed on the upper ball joint. A grouting hole leading to the center of the controllable anti-overturning swivel ball joint is reserved on the top plate for backfilling and sealing the center after the rotation is completed.

[0010] Preferably, the ball joint bracket is fixedly connected to the lower ball joint by bolts and nuts, a lower connecting frame is provided on the ball joint bracket, and an upper connecting frame is provided on the lower ball joint, the screw end of the bolt passes through the lower connecting frame and the upper connecting frame upward in sequence, each of the bolts is threadedly connected to three nuts, one of the nuts is locked to the upper side of the lower connecting frame, and the other two nuts are respectively locked to the upper and lower sides of the upper connecting frame.

[0011] Compared with the prior art, the present invention has achieved the following technical effects:

[0012] The upper ball joint and the lower ball joint of the present invention are arranged in a hollow circular ring shape as a whole, and a narrower cross-section can be achieved under the condition of the same bearing capacity, which is more conducive to ensuring the density of the concrete pouring at the bottom; the overall plane structure of the controllable anti-overturning swivel ball joint is annular, which is conducive to backfilling and sealing the center part through the reserved grouting holes on the top plate after the swivel operation is completed, thereby ensuring the safe use of the bridge in the later stage; by setting a sealing ring, external debris is effectively prevented from entering the spherical swivel pair, thereby ensuring the flexible operation and stable operation of the spherical swivel pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the structure of the controllable anti-overturning swivel ball joint of this embodiment;

[0015] Figure 2 This is a top view of the controllable anti-overturning swivel ball joint of this embodiment after removing the top plate;

[0016] Figure 3 is a bottom view of the top plate;

[0017] Explanation of the reference numerals: 1. Upper ball joint; 2. Lower ball joint; 3. Limit pin; 4. Annular slide plate; 5. Sealing ring; 6. Ball joint bracket; 7. Top plate; 8. Grouting pipe. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The purpose of the present invention is to provide a controllable anti-overturning swivel ball joint to solve the technical problems of the swivel device such as incomplete casting, incomplete backfilling and sealing, and weak anti-overturning ability.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-3As shown, this embodiment provides a controllable anti-overturning swivel ball joint, including a ball joint bracket 6, a lower ball joint 2, a limit pin 3 and an upper ball joint 1.

[0022] Among them, the lower ball joint 2 is fixed on the ball joint bracket 6, the upper ball joint 1 is coaxially and longitudinally stacked on the lower ball joint 2, the upper ball joint 1 and the lower ball joint 2 are spherically rotated, the limit pin 3 is fixed at the center position of the lower ball joint 2, the upper ball joint 1 is provided with a limit hole for the limit pin 3 to be inserted, the limit pin 3 is a steel tube concrete structure, the upper ball joint 1 is a circular convex spherical structure, and the lower ball joint 2 is a circular concave spherical structure adapted to the upper ball joint. In this embodiment, the limit pin 3 is a steel tube concrete structure.

[0023] When in use, the upper ball joint 1 and the lower ball joint 2 are assembled in a spherical rotation manner and can withstand a large overturning moment; since the limit hole limits the position of the limit pin 3, the vertical rotation angle of the upper ball joint 1 is within the set value range.

[0024] In order to reduce the rotational friction between the upper ball joint 1 and the lower ball joint 2, the present embodiment further includes an annular slide plate 4. The annular slide plate 4 is located between the lower ball joint 2 and the upper ball joint 1 and is embedded in the lower ball joint 2. The lower ball joint 2 is provided with a slide plate groove for installing the annular slide plate 4. The upper ball joint 1 and the lower ball joint 2 are rotatably assembled through the annular slide plate 4. The specific structure of the annular slide plate 4 is common knowledge in the art and will not be described in detail here.

[0025] In order to prevent rainwater, sand and other foreign objects from entering the spherical revolute pair and affecting the revolute matching effect, the present embodiment further includes a sealing ring 5. The sealing ring 5 is located between the lower ball joint 2 and the upper ball joint 1 and is embedded in the lower ball joint 2. The lower ball joint 2 is provided with a sealing ring groove for installing the sealing ring 5. The sealing ring groove is annularly sleeved on the inner and outer sides of the slide plate groove. Those skilled in the art can also sleeve it on one side of the slide plate groove.

[0026] In order to ensure better stable support and centripetal self-resetting effect under load, the upper ball joint 1 in this embodiment is a circular convex spherical structure, and the lower ball joint 2 is a circular concave spherical structure adapted to the upper ball joint 1.

[0027] In order to ensure the installation accuracy of the controllable anti-overturning swivel ball joint, the installation height of the lower ball joint 2 is adjusted by a bolt and nut assembly in this embodiment. Specifically, the ball joint bracket 6 is fixedly connected to the lower ball joint 2 by bolts and nuts, and a lower connecting frame is provided on the ball joint bracket 6, and an upper connecting frame is provided on the lower ball joint 2. The screw end of the bolt passes upward through the lower connecting frame and the upper connecting frame in turn, and each bolt is threadedly connected to three nuts, one of which is locked on the upper side of the lower connecting frame, and the other two nuts are respectively locked on the upper and lower sides of the upper connecting frame. The installation height of the lower ball joint 2 can be changed by adjusting the axial installation position of the nut on the bolt.

[0028] To facilitate subsequent construction, this embodiment also includes a top plate 7, which is installed on the upper ball joint 1. A grouting hole leading to the center of the controllable anti-overturning swivel ball joint is reserved on the top plate 7 for backfilling and sealing the center part after the rotation is completed.

[0029] The construction process of the controllable anti-overturning swivel ball joint of this embodiment is as follows: first install the ball joint bracket 6, adjust the height and position of the ball joint bracket 6 to meet the requirements and then fix it, then hoist the lower ball joint 2 in place and accurately adjust it through the bolt and nut assembly, pour the lower pedestal concrete and the concrete in the center of the limit pin 3 to form the limit pin 3 of the steel tube concrete structure, then install the annular slide 4, the sealing ring 5, the upper ball joint 1 and the top plate 7 in sequence, so as to complete the installation of the swivel support, and build the template to cast the upper structure. When pouring the upper structure, it is necessary to reserve a grouting pipeline leading to the center of the controllable anti-overturning swivel ball joint. The grouting pipeline is connected to the prefabricated hole on the top plate 7, and the bridge rotation operation is carried out after the construction of the upper structure is completed. After the rotation operation is completed, the backfill concrete is pressed into the central area of ​​the controllable anti-overturning swivel ball joint and the pedestal gap outside the controllable anti-overturning swivel ball joint through the reserved grouting pipeline to ensure dense pouring, form a stable support, and ensure the safety of the bridge in service.

[0030] Taking into account the controllable anti-overturning swivel ball joint with the same bearing capacity and the same upper swivel structure, the support position is adjusted from the central fulcrum to the annular support. The support stability of the latter should be improved compared with the former, and it is more effective in controlling the settlement of the pedestal on the swivel structure. In order to simply verify the influence of the annular support structure on the settlement of the pedestal, two models of 350MN and 165MN tonnage were selected for simulation analysis. The main steps are: SolidWorks modeling → select material configuration → add constraints and vertical forces to the model → divide the grid → finite element analysis to obtain the model displacement. Under the condition of the same upper pedestal size and structure, the model displacement obtained by changing the structure of the support is shown in Tables 1 and 2. It can be seen from Tables 1 and 2 that the controllable anti-overturning swivel ball joint of this embodiment is beneficial to the control of the settlement of the pedestal.

[0031] Table 1

[0032]

[0033] Table 2

[0034]

[0035]

[0036] The present specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A controllable anti-overturning swivel ball joint, characterized in that: It includes a ball joint bracket, a lower ball joint, a limit pin, an upper ball joint, an annular slide plate and a top plate, wherein the lower ball joint is fixed on the ball joint bracket, the upper ball joint is coaxially and longitudinally stacked on the lower ball joint, the upper ball joint and the lower ball joint are spherically rotated and assembled, the limit pin is fixed at the center position of the lower ball joint, the upper ball joint is provided with a limit hole for inserting the limit pin, the limit pin is a steel tube concrete structure, the upper ball joint is a circular convex spherical structure, and the lower ball joint is a circular concave spherical structure adapted to the upper ball joint; The annular slide is located between the lower ball joint and the upper ball joint and is embedded in the lower ball joint. The lower ball joint is provided with a slide groove for mounting the annular slide. The upper ball joint and the lower ball joint are rotatably assembled through the annular slide. The top plate is mounted on the upper ball joint, and a grouting hole leading to the center of the controllable anti-overturning swivel ball joint is reserved on the top plate for backfilling and sealing the center after the rotation is completed.

2. The controllable anti-overturning swivel ball joint according to claim 1 is characterized in that: It also includes a sealing ring, which is located between the lower ball joint and the upper ball joint and embedded in the lower ball joint. The lower ball joint is provided with a sealing ring groove for installing the sealing ring, and the sealing ring groove is annularly sleeved on the inner side and / or outer side of the slide plate groove.

3. The controllable anti-overturning swivel ball joint according to claim 1 is characterized in that: The ball joint bracket is fixedly connected to the lower ball joint by bolts and nuts. The ball joint bracket is provided with a lower connecting frame, and the lower ball joint is provided with an upper connecting frame. The screw ends of the bolts pass through the lower connecting frame and the upper connecting frame upward in sequence. Each of the bolts is threadedly connected to three nuts, one of which is locked on the upper side of the lower connecting frame, and the other two nuts are respectively locked on the upper and lower sides of the upper connecting frame.

Images