Elastic sawtooth meshing mechanical connecting device
By adopting elastic serrated meshing mechanical connection device, the meshing and expansion of the serrated plug-in and elastic serrated sleeve are used to solve the problem of gap deviation in mechanical connection of prefabricated piles, efficient and stable connection is achieved, and construction efficiency and quality are improved.
Patent Information
- Application Number
- CN202421788137.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-26
AI Technical Summary
The existing mechanical connections of prefabricated piles have gap deviation problems, which leads to unstable connections, which are difficult to meet high-precision requirements, and are low in construction efficiency, which poses quality hazards.
The elastic serrated meshing mechanical connection device is adopted, including a serrated plug-in and an elastic serrated sleeve. Through the meshing and elastic expansion of the serrated teeth, efficient connection of the prefabricated pile end surface is achieved and the deviation of different gaps is adapted.
The fast and efficient connection of prefabricated piles is achieved, and the engineering quality is controllable, avoiding the problem of inability to connect and improving construction efficiency and quality.
Smart Images
Figure CN222772458U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of concrete prefabricated part connection, in particular to an elastic sawtooth meshing mechanical connection device. Background Art
[0002] At present, most of the mechanical connections of precast piles are connected by a single neck and a clamp. The gap between the connections can only accommodate an axial gap deviation of 1-2mm. The flatness of the precast pile end, the inclination of the end face, and the deviation of the center distance between the steel sleeves are very high. Precast piles are bulky and heavy, and the processing precision is too high, so the production cost will be higher. For conventional diameter 300-600 pipe piles, the maximum deviation of the inclination of the pile end of 600 pipe piles is allowed to be 3mm (see national standard GB / T13476). For large-diameter pipe piles, the allowable deviation is even greater. If the maximum gap between two sections of piles is 6mm when they are connected, if there is some deviation in the verticality of the pile body during construction, then when the piles are actually connected, in order to correct the verticality deviation of the connected piles within the range, the local maximum gap between the end faces of the connected piles may reach about 10mm or more. At present, the mechanical connection effect without end plates in actual construction is very poor. On the one hand, the manufacturing accuracy of the pipe pile ends in actual production cannot meet the high-precision requirements of mechanical connection, and may even exceed the allowable deviation of the national standard. On the other hand, the verticality deviation of the pipe piles in the pile connection construction is also difficult to effectively control. There are many mechanical connection devices that cannot be connected, which poses quality risks and worrying construction quality! At present, when welding pipe piles with end plates, steel gaskets are inserted into the gaps and then welded together with the end plates to make up for the uneven end faces or large gaps in the joints with large inclinations. The quality of on-site manual welding is also uncontrollable, which also increases construction costs and reduces construction efficiency. Utility Model Content
[0003] Technical purpose: In view of the shortcomings of the above-mentioned existing prefabricated pile connections, the utility model discloses an elastic sawtooth meshing mechanical connection device with fast pile connection construction, high efficiency and controllable engineering quality.
[0004] Technical solution: To achieve the above technical objectives, the utility model adopts the following technical solution:
[0005] A flexible sawtooth meshing mechanical connection device comprises a sawtooth plug-in and an elastic sawtooth sleeve for connecting two mating surfaces, wherein one end of the sawtooth plug-in is connected to the mounting hole of one of the mating surfaces, and the other end provided with saw teeth is cooperatively connected to the elastic sawtooth sleeve arranged in the mounting hole of the other mating surface, and the elastic sawtooth sleeve comprises a fixing section for fixing on the mating surface and a sawtooth meshing section which can be extended and retracted in the radial direction, and the inner surface of the sawtooth meshing section matches the sawtooth shape of the sawtooth plug-in.
[0006] Preferably, the sawtooth inclination direction of the sawtooth plug-in of the utility model is opposite to the insertion direction of the sawtooth plug-in during docking.
[0007] Preferably, the sawtooth of the utility model is an annular sawtooth arranged in the circumferential direction of the sawtooth plug-in, and the cross-section of the annular sawtooth is a right-angled triangle structure. One of the right-angled sides of the annular sawtooth is located at the top as an axial limiting plane after being connected to the elastic sawtooth sleeve, and the angle between the hypotenuse of the annular sawtooth and the axial direction of the sawtooth plug-in is 30-35°.
[0008] Preferably, the outer surface of the sawtooth of the utility model is provided with a chamfered plane parallel to the sawtooth insert.
[0009] Preferably, the sawtooth engagement section of the utility model is provided with a plurality of cutting slits opened along the end and extending to the fixed section. When the sawtooth plug is inserted, the sawtooth engagement section expands and retracts radially along the area where the cutting slits are located to complete the docking with the sawtooth plug.
[0010] Preferably, an elastic shrink ring is arranged outside the sawtooth meshing section of the utility model.
[0011] Preferably, the fixed section and the sawtooth meshing section of the utility model are connected and transitioned by a tapered sleeve structure with a gradually decreasing diameter.
[0012] Preferably, the outer periphery of the fixed section of the utility model is sleeved with a flexible free ring for cooperating with the docking surface of the elastic serrated sleeve, and the axis of the entire elastic serrated sleeve is adjusted by the flexible free ring to be consistent with the axis of the serrated plug-in.
[0013] Preferably, the end of the elastic serrated sleeve of the utility model is provided with a sealing threaded sleeve for restricting the elastic serrated sleeve in the mounting hole of the corresponding docking surface, and epoxy resin is filled between the sealing threaded sleeve and the end surface of the elastic serrated sleeve.
[0014] Beneficial effects: The elastic sawtooth meshing mechanical connection device disclosed in the utility model has the following beneficial effects:
[0015] 1. The utility model uses an elastic serrated sleeve to dock with the serrated plug-in, so that the serrated sleeve can be elastically expanded and retracted when the serrated plug-in is inserted, so that the serrated sleeve and the plug-in are smoothly meshed with the serrations, reducing the difficulty of assembly and improving efficiency.
[0016] 2. The saw teeth on the sawtooth plug of the utility model are right-angled triangular saw teeth, and the angle between them and the axis direction of the sawtooth plug is 30-35 degrees. When docking, the bevels on both sides of the annular sawtooth form a large flared inclination angle, which is convenient for smooth guidance and minimum insertion resistance during insertion.
[0017] 3. The utility model sets a 0.2mm plane at the tooth tip as a chamfered plane, which can reduce the burrs generated when the tooth tip is processed and the burrs generated when the plug-in is inserted and squeezed into the tooth tip, thereby affecting the meshing accuracy and ensuring the connection accuracy.
[0018] 4. The elastic serrated sleeve of the utility model cooperates with the mounting hole of the corresponding docking surface through the flexible free ring and is automatically centered. When docking, the deviation of the elastic serrated sleeve before mechanical connection is eliminated. The flexible ring freely adjusts the serrated sleeve to adapt to the central axis position of the serrated plug-in, reducing the rigid hard extrusion resistance when eccentric.
[0019] 5. The number of saw teeth of the utility model can be set according to the gap requirements of the pile connection. There are at least 6-7 rows of circumferentially independent triangular saw teeth, which can meet the maximum gap of about 10mm between the connected piles while still having more than 2 meshing saw teeth, thereby ensuring that multiple mechanical connection devices can be stressed at the same time, avoiding the disadvantage that most of the current mechanical connections have only a single tooth or a single neck that cannot be connected due to large gaps.
[0020] 6. Before the pile is connected, the utility model fills epoxy resin between the two end faces and between the end faces of the sealing threaded sleeve and the elastic serrated sleeve, which makes up for the gap error between the mechanical connecting devices, so that all the mechanical connecting devices at the end can evenly bear the pull-out force at the same time, greatly improving the pull-out effect of the pipe pile joint. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.
[0022] Figure 1 This is a structural diagram of the connection device of the utility model;
[0023] Figure 2 A schematic diagram of the connection state of prefabricated piles using the connection device of the utility model;
[0024] Figure 3 This is an enlarged view of the sawtooth structure on the sawtooth plug-in of the utility model;
[0025] Figure 4 This is a cross-sectional structural diagram of the sawtooth meshing section of the elastic sawtooth sleeve of the utility model;
[0026] Among them, 1-serrated plug-in, 2-elastic serrated sleeve, 3-serrated, 4-fixed section, 5-serrated meshing section, 6-chamfered plane, 7-elastic shrink ring, 8-flexible free ring, 9-sealing threaded sleeve, and 10-cutting seam. DETAILED DESCRIPTION
[0027] Reference will now be made in detail to embodiments of the present disclosure, one or more examples of which are set forth herein below. Each embodiment and example is provided by explaining the apparatus, composition and materials of the present disclosure, rather than limiting. On the contrary, the following description provides a convenient illustration of an exemplary embodiment for implementing the present disclosure. In fact, it will be clear to those skilled in the art that various modifications and variations can be made in the teachings of the present disclosure without departing from the scope or spirit of the present disclosure. For example, a feature shown or described as a part of an embodiment can be used in conjunction with another embodiment to produce yet another embodiment. It is expected that the present disclosure covers such modifications and variations within the scope of the appended claims and their equivalents. Other objects, features and aspects of the present disclosure are disclosed in the following detailed description. It will be understood by those of ordinary skill in the art that this discussion is only a description of exemplary embodiments and is not intended to limit the wider aspects of the present disclosure.
[0028] like Figure 1-Figure 4 As shown, the utility model discloses an elastic sawtooth meshing mechanical connection device, which is used for docking the end faces of two prefabricated piles, and comprises a sawtooth plug-in 1 and an elastic sawtooth sleeve 2 for connecting the two docking faces, wherein one end of the sawtooth plug-in 1 is connected to the mounting hole of one of the docking faces, and the other end provided with sawtooth 3 is matched and connected with the elastic sawtooth sleeve 2 arranged in the mounting hole of the other docking face, and the elastic sawtooth sleeve 2 comprises a fixing section 4 for fixing on the docking face and a sawtooth meshing section 5 which can be extended and retracted in the radial direction, and the inner surface of the sawtooth meshing section 5 matches the shape of the sawtooth 3 of the sawtooth plug-in 1.
[0029] like Figure 2 As shown, the two prefabricated piles to be connected are respectively recorded as an upper section pile and a lower section pile, the upper end of the serrated plug-in 1 is threadedly connected to the sleeve nut in the upper section pile, the elastic serrated sleeve 5 is arranged in the sleeve nut of the lower section pile, and a sealing threaded sleeve 9 is arranged at the end of the elastic serrated sleeve 2 for limiting the elastic serrated sleeve 2 in the corresponding mounting hole of the docking surface, the threaded sleeve 9 is threadedly connected to the corresponding sleeve nut, and the upper section pile and the lower section pile can be docked after assembly.
[0030] The sawtooth 3 of the sawtooth plug-in 1 of the utility model is inclined in the opposite direction to the insertion direction of the sawtooth plug-in 1 during docking. The sawtooth 3 is annularly arranged in the circumferential direction of the sawtooth plug-in. The annular sawtooth is evenly arranged along the axial direction of the sawtooth plug-in 1. The cross section of the annular sawtooth is a right-angled triangle structure. One of the right-angled sides of the annular sawtooth is located at the top as the axial limiting plane after being connected with the elastic sawtooth sleeve 2. The angle between the hypotenuse of the annular sawtooth and the axial direction of the sawtooth plug-in (1) is 30-35° to form a large trumpet-shaped inclination structure, which is convenient for smooth guidance during insertion and minimizes insertion resistance. At the same time, after the sawtooth plug-in 1 is connected with the elastic sawtooth sleeve 2, the plane where the horizontal right-angled side of the sawtooth is located is used for axial limiting to ensure the axial tensile strength.
[0031] The number of saw teeth can be selected according to the pile joint gap to ensure that there are more than two groups of saw teeth meshing with each other under different gaps, thereby ensuring the axial pull-out resistance and avoiding disengagement.
[0032] At the same time, a chamfered plane 6 parallel to the sawtooth insert 1 may be provided on the outer surface of the sawtooth 3 to reduce the influence of machining burrs on the tooth tip on the meshing accuracy.
[0033] In a specific embodiment, Figure 1 and Figure 4 As shown, the sawtooth meshing section 5 of the utility model is provided with a plurality of cutting slits 10 opened along the end and extending to the fixed section 4. The cutting slits 10 are evenly distributed along the circumferential direction. When the sawtooth plug-in 1 is inserted, the sawtooth meshing section 5 expands and retracts along the radial direction of the area where the cutting slits 10 are located to complete the docking with the sawtooth plug-in 1; an elastic shrinking ring 7 is arranged on the outside of the sawtooth meshing section 5, and the elastic shrinking ring assists the contraction of the sawtooth meshing section 5 to facilitate the meshing of the saw teeth. In order to reduce the difficulty of docking, the fixed section and the sawtooth meshing section of the utility model are connected and transitioned by a tapered sleeve structure with a gradually decreasing diameter, so that the end of the sawtooth plug-in 1 is gradually introduced into the sawtooth meshing section 5.
[0034] The outer periphery of the fixed section 4 of the utility model is sleeved with a flexible free ring 8 for cooperating with the butt surface of the elastic serrated sleeve 2. The flexible free ring 8 is used to adjust the axis of the entire elastic serrated sleeve 2 to be consistent with the axis of the serrated insert 1.
[0035] When the utility model is used, an elastic serrated sleeve 2 is installed in the sleeve nut of the upper pile end of the lower section pile, and then a sealing threaded sleeve 9 is installed. A serrated plug-in 1 is screwed into the sleeve nut of the lower pile end of the upper section pile. When connecting the piles, before the plug-in is inserted, epoxy resin is filled on the plane of the end of the lower section pile and in the sealing threaded sleeve 9. The gap error between the mechanical connecting device devices and the end face gap between the piles are compensated by the filling of epoxy resin. The upper section pile on which the serrated plug-in 1 has been fully installed is aligned with the sealing threaded sleeve 9 of the lower section pile and slowly connected. When the center line of the upper and lower connecting parts deviates, the plug-in is inserted. The component is inserted into the elastic serrated sleeve 2, the flexible free ring 8 is flexibly squeezed, and the elastic serrated sleeve 2 is adjusted to swim horizontally so as to adapt to the central guide insertion of the upper serrated plug-in 1 to ensure that the verticality of the upper pile section during construction is within the allowable deviation. If it is found that the local gap between the end faces of the two prefabricated piles at the pile connection is too large, a steel gasket can be inserted to fill it, and epoxy resin can be brushed on the end of the lower pile section. Then the upper pile section can be relaxed and rely on its own gravity weighing several tons to effectively insert the serrated plug-in into the corresponding serrated meshing section in the elastic serrated sleeve 2, so that the serrations 3 cooperate with the serrated meshing section 5 to complete the pile connection.
Claims
1. An elastic sawtooth meshing mechanical connection device, characterized in that: The invention comprises a sawtooth plug-in (1) and an elastic sawtooth sleeve (2) for connecting two butting surfaces, wherein one end of the sawtooth plug-in (1) is connected to a mounting hole of one of the butting surfaces, and the other end provided with saw teeth (3) is matched and connected to an elastic sawtooth sleeve (2) arranged in the mounting hole of the other butting surface, and the elastic sawtooth sleeve (2) comprises a fixing section (4) for fixing on the butting surface and a sawtooth meshing section (5) which can be extended and retracted in the radial direction, and the inner surface of the sawtooth meshing section (5) matches the shape of the saw teeth (3) of the sawtooth plug-in (1).
2. The elastic sawtooth meshing mechanical connection device according to claim 1, characterized in that: The inclination direction of the saw teeth (3) of the saw tooth plug-in unit (1) is opposite to the insertion direction of the saw tooth plug-in unit (1) during docking.
3. An elastic sawtooth meshing mechanical connection device according to claim 1 or 2, characterized in that: The sawtooth (3) is an annular sawtooth arranged in the circumferential direction of the sawtooth plug-in (1), the cross section of the annular sawtooth is a right-angled triangle structure, one of the right-angled sides of the annular sawtooth is located at the top as an axial limiting plane after being connected to the elastic sawtooth sleeve (2), and the angle between the hypotenuse of the annular sawtooth and the axial direction of the sawtooth plug-in (1) is 30-35 degrees.
4. The elastic sawtooth meshing mechanical connection device according to claim 3, characterized in that: The outer surface of the saw tooth (3) is provided with a chamfered plane (6) parallel to the saw tooth insert (1).
5. The elastic sawtooth meshing mechanical connection device according to claim 1, characterized in that: The sawtooth engagement section (5) is provided with a plurality of cutting slits (10) opened along the end and extending to the fixed section (4); when the sawtooth plug-in (1) is inserted, the sawtooth engagement section (5) expands and retracts along the radial direction of the area where the cutting slits (10) are located, thereby completing docking with the sawtooth plug-in (1).
6. The elastic sawtooth meshing mechanical connection device according to claim 5, characterized in that: An elastic shrink ring (7) is arranged outside the sawtooth meshing section (5).
7. The elastic sawtooth meshing mechanical connection device according to claim 5, characterized in that: The fixed section (4) and the sawtooth meshing section (5) are connected and transitioned via a tapered sleeve structure with a gradually decreasing diameter.
8. The elastic sawtooth meshing mechanical connection device according to claim 1, characterized in that: The outer periphery of the fixed section (4) is sleeved with a flexible free ring (8) for cooperating with the butt joint surface of the elastic sawtooth sleeve (2). The flexible free ring (8) is used to adjust the axis of the entire elastic sawtooth sleeve (2) to be consistent with the axis of the sawtooth insert (1).
9. The elastic sawtooth meshing mechanical connection device according to claim 1, characterized in that: The end of the elastic serrated sleeve (2) is provided with a sealing threaded sleeve (9) for confining the elastic serrated sleeve (2) in the mounting hole of the corresponding mating surface, and epoxy resin is filled between the sealing threaded sleeve (9) and the end surface of the elastic serrated sleeve (2).