Anti-false tightening bolt ball node with visualization of bolt tightening process and construction method thereof

Abstract

The present invention proposes an anti-false tightening bolt ball node and a construction method thereof that can visualize the bolt screwing process, and belongs to the field of steel structure space structure. It solves the problem of "false tightening" phenomenon caused by the inability of construction workers to directly observe the bolt screwing process in existing bolt ball nodes. The threaded end of the high-strength bolt of the spherical node is screwed into the bolt ball, and the straight rod end is connected to the cone head, which is installed at the end of the rod. The high-strength bolt is sleeved on the outer periphery, and reset springs are provided on both sides of the indicator block and connected to the outer wall of the sleeve through the reset spring. The reset spring is always in a tensile state, one end is connected to the connecting plate of the indicator block, and the other end is connected to the outer wall of the sleeve. The present invention transmits torque through the contact between the groove on the inner wall of the sleeve and the protrusion on the high-strength bolt. Compared with the bolt ball node in which the high-strength bolt is screwed in by a traditional pin, this node is more evenly stressed and can transmit greater torque. At the same time, it can avoid misjudgment of the bolt screwing depth due to the broken pin.

Description

Technical Field

[0001] The present invention belongs to the technical field of steel structure space structure, and relates to a spatial grid structure node and a construction method thereof, specifically a bolt ball node with visualizable bolt screwing process and an anti-false screwing method thereof. Background Art

[0002] The bolt-ball node is a commonly used spatial grid structure node form. It has the characteristics of high degree of factory prefabrication, convenient on-site construction, and fast installation. It conforms to the development trend of prefabricated buildings and has been widely used in spatial structure engineering.

[0003] Bolt ball nodes are usually composed of bolt balls, high-strength bolts, pins, sleeves, cone heads or cover plates. During on-site construction, the sleeve is rotated, and the sleeve drives the high-strength bolt to be screwed into the bolt ball through the pin, ultimately achieving the connection between the rod and the node.

[0004] High-strength bolts are the primary force-transmitting components of joints and rods, and their construction quality significantly impacts the joint's load-bearing performance. The "Technical Code for Spatial Grid Structures" requires that the insertion length of high-strength bolts be approximately 1.1 times the bolt diameter. However, in actual construction, high-strength bolts are often concealed within sleeves, making it impossible to directly observe the bolt insertion progress during construction. This often leads to false tightening, where the high-strength bolts fail to meet the specified insertion depth due to misaligned holes or other reasons. These "falsely tightened" high-strength bolts, due to insufficient penetration into the bolt ball, can easily be pulled out, causing joint failure. Summary of the Invention

[0005] In view of this, the present invention aims to propose an anti-false tightening bolt ball node and a construction method thereof with visualizing the bolt tightening process, so as to solve the problem of "false tightening" phenomenon caused by the existing bolt ball node due to the construction personnel's inability to directly observe the bolt tightening process.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a bolt ball node for preventing false tightening with visualization of the bolt screwing process, comprising a bolt ball, a high-strength bolt, an indicator block, a sleeve, a cone head and a rod, wherein the threaded end of the high-strength bolt is screwed into the bolt ball, the straight rod end is connected to the cone head, the cone head is installed at the end of the rod, a sleeve is sleeved on the outer periphery of the high-strength bolt, reset springs are provided on both sides of the indicator block, and the reset spring is connected to the outer wall of the sleeve through the reset spring, the reset spring is always in a stretched state, one end is connected to the connecting plate of the indicator block, and the other end is connected to the outer wall of the sleeve.

[0007] Furthermore, four sections of strip-shaped protrusions are evenly arranged on the high-strength bolt, each strip-shaped protrusion is provided with an inclined surface near one end of the bolt cap, and an indicating inclined groove is provided at the bottom end of the inclined surface; wherein the slope of the indicating inclined groove is consistent with the slope of the strip-shaped protrusion, and the length corresponds to the indicating block.

[0008] Furthermore, four strip grooves are evenly arranged on the inner side of the sleeve, and the strip grooves correspond to the size of the strip protrusions and are larger than the strip protrusions.

[0009] Furthermore, a rectangular hole of the same size as the indicator block is opened at a position corresponding to the inner wall of the sleeve and the indicating bevel groove, and a reset spring is connected to both ends of the rectangular hole along the circumferential direction of the sleeve. The position of the rectangular hole corresponds to the position of the indicating bevel groove when the high-strength bolt is fully screwed in.

[0010] Furthermore, an annular baffle is provided inside the rod, and the annular baffle is welded to the rod. The inner ring size of the annular baffle is smaller than the size of the high-strength bolt nut, and the outer diameter is slightly smaller than the inner diameter of the rod.

[0011] Furthermore, the distance from the annular baffle to the distal end of the cone head is less than the length of the high-strength bolt and greater than the length of the unthreaded section of the high-strength bolt.

[0012] Furthermore, the indicating block has a scale, a connecting plate is provided on the left and right of the upper end, and a slope is provided on the lower end, and the slope of the slope is the same as the slope of the strip-shaped protrusion.

[0013] A construction method for preventing false tightening of bolt ball joints with visualizing the bolt tightening process, specifically comprising the following steps:

[0014] (1) First, weld the baffle to the rod. The distance from the baffle to the far end of the cone head is less than the length of the high-strength bolt and greater than the length of the unthreaded section of the high-strength bolt to ensure that the high-strength bolt will not slip into the interior of the rod during subsequent installation.

[0015] (2) Place the high-strength bolt into the rod and weld the cone head to the rod;

[0016] (3) Remove the high-strength bolt from the circular hole of the cone head and insert the sleeve into the high-strength bolt until the high-strength bolt indicator groove and the sleeve rectangular hole are aligned;

[0017] (4) Align the rectangular hole and insert the indicator block, stretch the return springs connected to both ends of the sleeve rectangular hole and connect them to the connecting plate, so that the indicator block always bears the tension from the return spring and presses against the slope of the strip-shaped raised end;

[0018] (5) Align the high-strength bolt at the end of the rod with the corresponding bolt ball thread hole, push the high-strength bolt back into the sleeve until the spring is stretched to the maximum value, and then rotate the sleeve to drive the high-strength bolt into the bolt ball. During this process, the sleeve and the high-strength bolt transmit torque through the contact between the groove on the inner wall of the sleeve and the protrusion on the outer wall of the high-strength bolt;

[0019] (6) As the high-strength bolt is screwed in, the indicator block gradually descends until it is close to the inner wall of the indicator bevel groove, which indicates that the high-strength bolt is screwed in. During the process, the scale of the indicator block is observed to judge the screw-in progress of the high-strength bolt, so as to realize the visualization of the screw-in of the high-strength bolt. The direction of the rod is fine-tuned according to the scales of the four indicator blocks to avoid misalignment between the high-strength bolt and the bolt ball hole.

[0020] Compared with the prior art, the anti-false-tightening bolt ball node with visual bolt screwing process and its construction method of the present invention have the following beneficial effects:

[0021] 1. The bolt-ball joint described in this invention transmits torque through contact between a groove on the inner wall of the sleeve and a protrusion on the high-strength bolt. Compared to traditional bolt-ball joints where a pin drives the high-strength bolt, this joint is more evenly stressed, capable of transmitting greater torque, while also preventing misjudgment of bolt penetration depth due to pin breakage.

[0022] 2. The indicator block of the present invention is acted upon by the tension of the reset spring, and the inclined surface at its lower end is always pressed against the slope of the strip-shaped protrusion of the high-strength bolt, and gradually sinks as the bolt is screwed into the bolt ball. Construction personnel can judge the progress of the bolt screwing in by observing the sinking depth of the indicator block and the scale on it, thereby visualizing the bolt screwing in process.

[0023] 3. The setting of the indicating bevel groove of the present invention can press against the side of the indicating block after the high-strength bolt is screwed into place, limiting the bolt from being screwed in further. At the same time, after the indicating block presses against the bevel groove, its upper surface is flush with the outer wall of the sleeve, indicating that the bolt is screwed into place, which can provide construction instructions for construction personnel.

[0024] 4. The sleeve of the present invention is provided with indicator blocks evenly around it. By comparing the sinking depths of the four indicator blocks, it can be judged whether the high-strength bolt is aligned with the bolt ball hole, thereby avoiding misalignment between the rod and the bolt ball. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0026] Figure 1 This is a structural diagram of a bolt ball node for preventing false tightening that visualizes the bolt tightening process according to the present invention;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the anti-false tightening bolt ball node for visualizing the bolt tightening process described in the present invention.

[0028] In the figure: 1-bolt ball, 2-high-strength bolt, 3-indicator block, 4-sleeve, 5-cone head, 6-rod, 2-1-bar protrusion, 2-2-indicator inclined groove, 3-1-connecting plate, 4-1-bar groove, 4-2-reset spring, 6-1-annular baffle. DETAILED DESCRIPTION

[0029] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0030] 1. Specific implementation method 1, see Figure 1-2 This embodiment describes a bolt ball joint that visualizes the bolt insertion process and prevents false tightening. The joint comprises a bolt ball 1, a high-strength bolt 2, an indicator block 3, a sleeve 4, a cone head 5, and a rod 6. The threaded end of the high-strength bolt 2 is screwed into the bolt ball 1, and the straight rod end is connected to the cone head 5, which is mounted on the end of the rod 6. The high-strength bolt 2 is sheathed with a sleeve 4. The indicator block 3 is provided with return springs 4-2 on both sides and is connected to the sleeve 4 via the return springs. The return springs 4-2 are always in a stretched state, with one end connected to the connecting plate 3-1 of the indicator block 3 and the other end to the outer wall of the sleeve 4. The bolt ball 1, cone head 5, and rod 6 are identical to those used in conventional bolt ball joints.

[0031] Four strip-shaped protrusions 2-1 are evenly arranged on the high-strength bolt 2, each strip-shaped protrusion 2-1 is provided with an inclined surface near one end of the bolt cap, and an indicating inclined groove 2-2 is provided at the bottom of the inclined surface; wherein the slope of the indicating inclined groove 2-2 is consistent with the slope of the strip-shaped protrusion 2-1, and the length corresponds to the indicating block 3.

[0032] Four strip grooves 4 - 1 are evenly arranged on the inner side of the sleeve 4 . The strip grooves 4 - 1 correspond to the size of the strip protrusions 2 - 1 and are larger than the strip protrusions 2 - 1 .

[0033] A rectangular hole of the same size as the indicator block 3 is opened on the inner wall of the sleeve 4 at a position corresponding to the indicating inclined groove 2-2, and a reset spring 4-2 is connected to the outer wall of the sleeve at both ends of the rectangular hole. The position of the rectangular hole corresponds to the position of the indicating inclined groove 2-2 when the high-strength bolt 2 is fully screwed in.

[0034] An annular baffle 6-1 is disposed within the rod 6 and welded to the rod 6. The inner ring of the annular baffle 6-1 is smaller than the nut of the high-strength bolt 2, and its outer diameter is slightly smaller than the inner diameter of the rod 6 (to facilitate placement of the annular baffle 6-1 within the circular tube of the rod 6). The distance from the annular baffle 6-1 to the outer surface of the cone head 5 should be less than the length of the high-strength bolt 2 and greater than the length of the unthreaded section of the high-strength bolt 2. The inner ring of the annular baffle 6-1 is smaller than the outer diameter of the nut of the high-strength bolt 2.

[0035] The distance between the annular baffle 6 - 1 and the distal end of the cone head 5 is shorter than the insertion length of the high-strength bolt 2 and longer than the length of the unthreaded section of the high-strength bolt 2 .

[0036] The indicating block 3 has a scale, and connecting plates 3-1 are respectively provided on the left and right sides of the upper end, and an inclined surface is provided on the lower end, and the slope of the inclined surface is the same as the slope of the strip-shaped protrusion 2-2.

[0037] The inner wall of the sleeve 4 is provided with a groove 4 - 1 corresponding to the high-strength bolt strip protrusion 2 - 1 and a rectangular hole of the same size as the indicator block 3 is opened at a position corresponding to the inclined groove 2 - 2 .

[0038] The lower end of the indicator block 3 is machined into an inclined surface corresponding to the slope of the strip-shaped protrusion 2-1 of the high-strength bolt 2. A connecting plate 3-1 is located on each side of the upper end. Return springs 4-2 are connected to each side of the connecting plate 3-1. The other end of the return spring 4-2 is connected to the outer wall of the sleeve 4. The return spring 4-2 is always in a stretched state, providing a pulling force pointing toward the sleeve to the indicator block 3.

[0039] A construction method for preventing false tightening of bolt ball joints with visualizing the bolt tightening process specifically comprises the following steps:

[0040] (1) First, weld the baffle 6-1 to the rod 6. The distance from the baffle to the distal end of the cone head is less than the length of the high-strength bolt 2 and greater than the length of the unthreaded section of the high-strength bolt 2 to ensure that the high-strength bolt 2 will not slip into the interior of the rod 6 during subsequent installation.

[0041] (2) Place the high-strength bolt 2 into the rod 6 and weld the cone head 5 to the rod 6;

[0042] (3) Remove the high-strength bolt 2 from the circular hole of the cone head 5, and insert the sleeve 4 into the high-strength bolt 2 until the indicating inclined groove 2-2 of the high-strength bolt 2 is aligned with the rectangular hole of the sleeve 4;

[0043] (4) Align the rectangular hole and insert the indicator block 3. Stretch the return springs 4-2 connected to both ends of the rectangular hole of the sleeve 4 and connect them to the connecting plate 3-1, so that the indicator block 3 always bears the tension from the return spring 4-2 and is tightly pressed against the slope of the end of the strip protrusion 2-1.

[0044] (5) Align the high-strength bolt 2 at the end of the rod 6 with the corresponding threaded hole of the bolt ball 1, and push the high-strength bolt 2 back into the sleeve 4 until the spring 4-2 is stretched to the maximum value, that is, the indicator block 3 reaches the highest point. Then, rotate the sleeve 4 to drive the high-strength bolt 2 into the bolt ball 1. During this process, the sleeve 4 and the high-strength bolt 2 contact and transmit torque through the groove on the inner wall of the sleeve 4 and the protrusion on the outer wall of the high-strength bolt 2;

[0045] (6) As the high-strength bolt 2 is screwed in, the indicator block 3 gradually descends until it is in close contact with the inner wall of the indicator bevel 2-2. This indicates that the high-strength bolt 2 is screwed in. During this process, the scale of the indicator block 3 can be observed to judge the progress of the bolt screwing in, so that the bolt screwing in can be visualized. The direction of the rod can be fine-tuned according to the scales of the four indicator blocks to avoid misalignment between the high-strength bolt and the bolt ball hole.

[0046] The invention of the present invention is:

[0047] 1. The present invention transmits torque by squeezing the protrusions around the high-strength bolt 2 and the grooves on the inner wall of the sleeve 4, and then screws the high-strength bolt 2 into the ball joint 1. Compared with the traditional bolt ball joint, the torque is transmitted through the protrusions, which has a better force transmission effect and can withstand greater torque. At the same time, it can avoid the weakening of the bolt caused by opening grooves on the bolt.

[0048] 2. The indicator block 3 of the present invention is pulled into the shallow groove by the restoring force of the reset spring 4-2, so that the indicator block 3 can slide in autonomously, which is more convenient to use.

[0049] 3. The present invention is provided with an indicator block 3 instead of a pin. The indicator block 3 is provided with a scale. The depth of the bolt screwing in can be accurately judged according to the scale of the indicator block 3, so that the depth of the bolt screwing in can be visualized. At the same time, compared with traditional nodes, the indication accuracy and visualization degree are better.

[0050] 4. The present invention is provided with four indicator blocks 3. Compared with the traditional anti-false tightening bolt ball node, the indicator block 3 is used not only to indicate the screwing depth, but also to judge whether the bolt ball screw hole and the bolt are aligned by comparing the scales of the four indicator blocks 3.

[0051] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A bolt ball node that can visualize the bolt screwing process and prevent false screwing, characterized by: It comprises a bolt ball (1), a high-strength bolt (2), an indicator block (3), a sleeve (4), a cone head (5) and a rod (6); the threaded end of the high-strength bolt (2) is screwed into the bolt ball (1), the straight rod end is connected to the cone head (5), the cone head (5) is installed on the end of the rod (6), the high-strength bolt (2) is sleeved with a sleeve (4) on its outer periphery, and reset springs (4-2) are provided on both sides of the indicator block (3) and are connected to the outer wall of the sleeve (4) through the reset springs (4-2); the reset spring (4-2) is always in a stretched state, one end of which is connected to the connecting plate (3-1) of the indicator block (3), and the other end of which is connected to the outer wall of the sleeve (4); Four sections of strip-shaped protrusions (2-1) are evenly arranged on the high-strength bolt (2); each strip-shaped protrusion (2-1) is provided with an inclined surface near one end of the bolt cap, and an indicating inclined groove (2-2) is provided at the bottom end of the inclined surface; wherein the slope of the indicating inclined groove (2-2) is consistent with the slope of the strip-shaped protrusion (2-1), and the length corresponds to the indicating block (3).

2. The bolt ball node for preventing false tightening with visualization of the bolt tightening process according to claim 1 is characterized in that: Four strip grooves (4-1) are evenly arranged on the inner side of the sleeve (4); the strip grooves (4-1) correspond in size to the strip protrusions (2-1) and are larger than the strip protrusions (2-1).

3. The bolt ball node with visualizable bolt screwing process and anti-false screwing according to claim 1 is characterized in that: A rectangular hole of the same size as the indicator block (3) is provided on the inner wall of the sleeve (4) at a position corresponding to the indicating inclined groove (2-2), and a return spring (4-2) is connected to both ends of the rectangular hole along the circumferential direction of the sleeve (4). The position of the rectangular hole corresponds to the position of the indicating inclined groove (2-2) when the high-strength bolt (2) is fully screwed in.

4. The bolt ball node with visualizable bolt screwing process and anti-false screwing according to claim 1, 2 or 3, characterized in that: An annular baffle (6-1) is provided inside the rod (6), and the annular baffle (6-1) is welded to the rod (6). The inner ring size of the annular baffle (6-1) is smaller than the nut size of the high-strength bolt (2), and the outer diameter is smaller than the inner diameter of the rod (6).

5. The bolt ball node for preventing false tightening with visualization of the bolt tightening process according to claim 4 is characterized in that: The distance between the annular baffle (6-1) and the distal end of the cone head (5) is less than the length of the high-strength bolt (2) and greater than the length of the non-threaded section of the high-strength bolt (2).

6. The bolt ball node for preventing false tightening with visualization of the bolt tightening process according to claim 1, characterized in that: The indicating block (3) has a scale, and connecting plates (3-1) are respectively provided on the left and right sides of the upper end, and an inclined surface is provided on the lower end, and the slope of the inclined surface is the same as the slope of the strip-shaped protrusion (2-1).

7. A construction method for preventing false tightening of a bolt ball joint with visualization of the bolt tightening process according to any one of claims 1 to 6, characterized in that: The specific steps include: (1) First, the annular baffle (6-1) is welded to the rod (6), and the distance from the baffle to the distal end of the cone head is less than the length of the high-strength bolt (2) and greater than the length of the unthreaded section of the high-strength bolt (2), so as to ensure that the high-strength bolt (2) will not slip into the interior of the rod (6) during the subsequent installation process; (2) placing the high-strength bolt (2) into the rod (6), and welding the cone head (5) and the rod (6); (3) Remove the high-strength bolt (2) from the circular hole of the cone head (5), and insert the sleeve (4) into the high-strength bolt (2) until the indicating inclined groove (2-2) of the high-strength bolt (2) and the rectangular hole of the sleeve (4) are aligned; (4) Align the rectangular hole and place the indicator block (3), stretch the return springs (4-2) connected to both ends of the rectangular hole of the sleeve (4) and connect them to the connecting plate (3-1), so that the indicator block (3) always bears the tension from the return spring (4-2) and is pressed against the slope of the end of the strip-shaped protrusion (2-1); (5) Align the high-strength bolt (2) at the end of the rod (6) with the corresponding threaded hole of the bolt ball (1), push the high-strength bolt (2) back into the sleeve (4) until the return spring (4-2) is stretched to the maximum value, and then rotate the sleeve (4) to drive the high-strength bolt (2) to be screwed into the bolt ball (1). During this process, the sleeve (4) and the high-strength bolt (2) transmit torque through the contact between the inner wall groove of the sleeve (4) and the outer wall protrusion of the high-strength bolt (2); (6) As the high-strength bolt (2) is screwed in, the indicator block (3) gradually descends until it is in close contact with the inner wall of the indicator bevel groove (2-2), which indicates that the high-strength bolt (2) is screwed in. During the process, the scale of the indicator block (3) is observed to judge the screwing progress of the high-strength bolt (2), so as to realize the visualization of the screwing in of the high-strength bolt (2), and the rod direction is fine-tuned according to the scales of the four indicator blocks (3) to avoid misalignment of the hole position of the high-strength bolt (2) and the bolt ball (1).

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