A monolithically stressed mortise mechanical connection

Abstract

The utility model relates to the technical field of pile body connection in construction engineering, specifically relates to a whole stress bolt type mechanical connection, especially suitable for the pile body butt joint scene needing to improve the pullout resistance. Including two pile body end plates, the contact surface of two pile body end plates mutually pasting is equipped with the bolt slot along the square of outer diameter, the number of bolt slot is greater than or equal to 2, the bolt slot is connected to the outer periphery of the pile body end plate, the bolt slot is narrow at the contact surface than the bolt slot is far from the contact surface, the bolt slot in the corresponding of two pile body end plates is installed with the bolt. The utility model has the advantages of low cost, convenient batch processing, low operation requirement for construction workers, reliable performance, convenient installation, unnecessary complex operation, improves the connection efficiency, the flange joint and the pile body end plate welding part stress synergy can bear the tension simultaneously, significantly improves the pullout resistance of the pile body joint, simple structure, strong adaptability, applicable to a variety of pile body connection scene.

Description

Technical Field

[0001] This utility model relates to the field of pile connection technology in building engineering, specifically to a pin-type mechanical connection that bears the overall force, which is particularly suitable for pile docking scenarios where improved pull-out resistance is required. Background Technology

[0002] According to specifications, pile foundations with high tensile bearing capacity in building construction must be connected mechanically. While some mechanical joints achieve rapid connection, they often fail to maintain tensile strength and are prone to loosening after connection, thus affecting the overall tensile bearing capacity of the pile foundation. Therefore, there is an urgent need for a tensile mechanical joint that can achieve rapid connection and bear load as a whole. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a pin-type mechanical connection with overall load-bearing capacity, including two pile end plates. The contact surfaces of the two pile end plates that fit together are provided with pin grooves on the outer diameter square shape. The number of pin grooves is greater than or equal to two. The pin grooves extend through and connect to the outer periphery of the pile end plates. The pin grooves are narrower near the contact surface than they are far from the contact surface. Pins are installed in the corresponding pin grooves on the two pile end plates.

[0004] Preferably, the pin groove is a dovetail groove, and the middle position of the pin is provided with an inwardly concave first inclined surface and a second inclined surface. The shape of the pin matches the corresponding pin grooves on the upper and lower ends of the two pile body end plates. The inner and outer widths of the pin groove and the pin are the same. The pin and the pin groove are in clearance fit or transition fit.

[0005] Preferably, the inner end of the pin is provided with a groove, and a conical wedge is installed in the groove.

[0006] Preferably, the pin groove is a dovetail groove, and the middle position of the pin is provided with an inwardly concave first inclined surface and a second inclined surface. The shape of the pin matches the pin grooves on the upper and lower parts of the two pile end plates. The inner and outer widths of the pin groove are the same. The outer end of the pin is wider than the inner end of the pin by a cone shape with an angle of α. When the pin is installed in the pin groove, the contact surface between the pin and the pin groove is interference-fitted.

[0007] Preferably, the pin groove is a dovetail groove, and the pin has an inwardly concave first and second inclined surfaces at the middle position. The shape of the pin matches the pin grooves on the upper and lower parts of the two pile end plates. The outer end of the pin groove is wider than the inner end by a cone shape with an angle of b. The inner and outer widths of the pin are the same. When the pin is installed in the pin groove, the contact surface between the pin and the pin groove is interference-fitted.

[0008] Preferably, the pin groove is a dovetail groove, and the pin has an inwardly concave first and second inclined surfaces at the middle position. The shape of the pin matches the pin grooves on the upper and lower ends of the two pile end plates. The outer end of the pin groove is wider than the inner end by a cone shape with an angle of b, and the outer end of the pin is wider than the inner end by a cone shape with an angle of a. When the pin is installed in the pin groove, the pin groove and the pin are in an interference fit.

[0009] Preferably, the pin slot is T-shaped, the pin is I-shaped, and the pin and pin slot are matched.

[0010] Preferably, adhesive is bonded in the gap between the pin slot and the pin, and the adhesive is one or more of the following: steel bonding adhesive, metal structure AB adhesive, epoxy resin metal adhesive, and fast-drying metal adhesive.

[0011] Preferably, the pile end plate has a welding bevel around the outer periphery of the contact surface.

[0012] Preferably, the pile end plate has positioning holes on the contact surface, and positioning pins are installed on the positioning holes of the two pile end plates simultaneously, with the positioning pins tightly fitted to the positioning holes.

[0013] Preferably, the pile end plate is further provided with tensioning holes.

[0014] The advantages of this utility model are low cost, convenient batch processing, low requirements for on-site workers, reliable performance, convenient installation, "insertion and tightening" without complicated operation, improved connection efficiency, and the welded parts of the flange joint and the pile end plate work together to bear the force, which can withstand the tensile force at the same time, significantly improving the pull-out resistance of the pile joint. The structure is simple, highly adaptable, and suitable for various pile connection scenarios. Attached Figure Description

[0015] Figures 1-2 This is a schematic diagram of the structure of Embodiment 1 of this utility model.

[0016] Figures 3-4 This is a schematic diagram of the straight pin groove of the pile end plate of this utility model.

[0017] Figure 5 This is a schematic diagram of the structure of the pile end plate of this utility model, where the pin groove is straight and the pin is tapered.

[0018] Figures 6-9 This is a schematic diagram of the cone-shaped pin groove of the pile end plate of this utility model.

[0019] Figures 10-11 This is a schematic diagram of the structure of the present invention, where the pin is straight.

[0020] Figures 12-14This is a schematic diagram of the conical pin structure of this utility model.

[0021] Figure 15 This is a schematic diagram of the cone-shaped pin groove of the pile end plate of this utility model.

[0022] Figure 16 This is a schematic diagram of the structure of the pile end plate of this utility model, where both the pin groove and the pin are straight. Figure 17 This is a schematic diagram of the structure of the pile end plate of this utility model, where the pin groove and the pin are both straight and conical wedges.

[0023] Figures 18-19 This is a schematic diagram of the structure of the pin and the conical wedge of this utility model.

[0024] Figure 20 This is a schematic diagram of the structure of the present invention before the straight pin and tapered wedge are installed.

[0025] Figures 21-22 This is a structural schematic diagram of Embodiment 6 of the present invention.

[0026] Figure 23 This is a schematic diagram of the pin and pile end plate in Embodiment 6 of this utility model.

[0027] Figures 24-25 This is a schematic diagram of the square-shaped end plate of the pile body of this utility model.

[0028] Figure 26 This is a structural schematic diagram of the square pile end plate, pin, and positioning pin of this utility model.

[0029] Figure 27 This is a schematic diagram of the structure of the square pile end plate of this utility model.

[0030] Figures 1-24 In the middle, 1. Pile end plate, 11. Pin groove, 12. Positioning hole, 13. Contact surface, 14. Welding bevel, 111. Outer end of groove, 112. Inner end of groove, 2. Pin, 21. First inclined surface, 22. Second inclined surface, 23. Outer end of pin, 24. Inner end of pin, 25. Groove, 3. Positioning pin, 4. Conical wedge, 5. Tensioning hole. Detailed Implementation

[0031] The embodiments of this utility model will be further described below with reference to the accompanying drawings: like Figures 1-24As shown, this utility model provides a pin-type mechanical connection with overall force bearing, including two pile end plates 1. The contact surfaces 13 of the two pile end plates 1 that fit together are provided with pin grooves 11 on the outer diameter square. The number of pin grooves 11 is greater than or equal to two. The pin grooves 11 extend through and connect to the outer periphery of the pile end plates 1. The pin grooves 11 near the contact surface 13 are narrower than the pin grooves 11 far from the contact surface 13. Pins 2 are installed in the corresponding pin grooves 11 on the two pile end plates 1.

[0032] The number of pin slots 11 is generally more than two and they are evenly distributed. The reason is that multiple slots and even distribution help to balance the force on the pile end plate 1 and make it less likely to cause stress concentration. At the same time, increasing the number of slots can also enable the present invention to withstand greater forces. In addition, the localized approach also helps with processing and installation.

[0033] The two pile end plates 1 are sequentially located on the two piles to be connected. During installation, the pin slots 11 on the two pile end plates 1 are aligned, and then the pins 2 are installed in the pin slots 11, so that the pins 2 are firmly locked in the pin slots 11. Due to the structure of the pin slots 11, which are smaller at the top and larger at the bottom, the pins 2 can withstand a large pull-out force. Different sizes and numbers of pin slots 11 and pins 2 can be designed according to different specifications of piles.

[0034] Since the pin groove 11 is narrower near the contact surface 13 than the pin groove 11 is far from the contact surface 13, when the two pile end plates 1 are subjected to tension, the pin 2 will fix the corresponding pin grooves 11, thus preventing the pile end plates 1 from separating, and finally achieving quick connection and overall force bearing.

[0035] This utility model has designed different embodiments, and the specific real-time methods are shown in the table below: Example 1 uses a straight pin slot 11 and a straight pin 2: like Figures 1-4 As shown, preferably, the pin groove 11 is a dovetail groove, and the pin 2 has an inwardly concave first inclined surface 21 and second inclined surface 22 at the middle position. The shape of the pin 2 matches the pin grooves 11 that correspond to each other on the two pile end plates 1. The inner and outer widths of the pin groove 11 and the pin 2 are the same. The pin 2 and the pin groove 11 are in clearance fit or transition fit.

[0036] Although the overall load-bearing capacity of the structure in Example 1 is relatively weaker than that of other examples, it has the advantages of simple processing technology and low processing cost.

[0037] In Example 1, since there is no taper, clearance fit or transition fit is often used when installing the pin 2 and the pin groove 11 for ease of installation. Because an interference fit would be very tight, the pin 2 cannot be smoothly installed in the pin groove 11. However, since the mechanical connection must withstand pull-out force, if there is a small gap between the pin 2 and the pin groove 11, an impact force will occur between the two pile end plates 1 under the force. Since the impact force is often very large, it can easily damage the connection.

[0038] To improve the mechanical properties of Embodiment 1, adhesive is bonded to the gap between the pin groove 11 and the pin 2. The adhesive is selected from one or more of the following: steel bonding adhesive, metal structural AB adhesive, epoxy resin metal adhesive, and fast-drying metal adhesive; other metal structural adhesives may also be used. The adhesive is suitable for bonding metal materials and can withstand high strength. For example, steel bonding adhesive can effectively fill the gap between the pin groove 11 and the pin 2. After the steel bonding adhesive solidifies, there will be no huge impact force between the pin groove 11 and the pin 2 as with a small gap, thus improving the pull-out resistance and lifespan of this invention.

[0039] Example 2 uses a straight groove 11 and a tapered pin 2: Preferably, the pin groove 11 is a dovetail groove, and the pin 2 has an inwardly concave first inclined surface 21 and second inclined surface 22 at the middle position. The shape of the pin 2 matches the pin grooves 11 on the upper and lower parts of the two pile end plates 1. The inner and outer widths of the pin grooves 11 are the same. The outer end 23 of the pin 2 is wider than the inner end 24 of the pin by a cone shape with an angle of α. When the pin 2 is installed in the pin groove 11, the contact surface between the pin 2 and the pin groove 11 is interference fit.

[0040] During installation, simply tap the pin 2 to the bottom of the groove 11 to firmly lock the pin 2 into place. Besides tapping, a press can also be used. The tapered shape also has a self-centering function, ensuring alignment of the center lines of the upper and lower pile end plates. Angle 'a' is typically designed to be relatively small, preferably within the range of 0° to 1°. Furthermore, the tapered shape of the pin 2 offers advantages such as ease of processing and low processing costs.

[0041] In this embodiment 2, just like in embodiment 1, glue is bonded in the gap between the pin groove 11 and the pin 2, so that the force-bearing area between the pin 2 and the pin groove 11 is larger, thereby being able to withstand greater pull-out force.

[0042] Example 3 uses a conical pin groove 11 and a straight pin 2: Preferably, the pin groove 11 is a dovetail groove, and the pin 2 has an inwardly concave first inclined surface 21 and second inclined surface 22 at the middle position. The shape of the pin 2 matches the pin grooves 11 on the upper and lower parts of the two pile end plates 1. The outer end 111 of the pin groove 11 is wider than the inner end 112 by a cone shape with an angle of b. The inner and outer widths of the pin 2 are the same. When the pin 2 is installed in the pin groove 11, the contact surface between the pin 2 and the pin groove 11 is interference fit.

[0043] Its installation method is the same as that of Example 2, except that it is much more difficult to process the groove 11 into a conical shape than the conical key, which naturally leads to the higher cost of Example 3 than that of Example 2.

[0044] In this embodiment 3, just like in embodiment 1, glue is bonded in the gap between the pin groove 11 and the pin 2, so that the force-bearing area between the pin 2 and the pin groove 11 is larger, thereby being able to withstand greater pull-out force.

[0045] Example 4 uses a conical pin groove 11 and a conical pin 2: Preferably, the pin groove 11 is a dovetail groove, and the pin 2 has an inwardly concave first inclined surface 21 and second inclined surface 22 at the middle position. The shape of the pin 2 matches the pin grooves 11 on the upper and lower parts of the two pile end plates 1. The outer end 111 of the pin groove 11 is wider than the inner end 112 by a cone shape with an angle of b. The outer end 23 of the pin 2 is wider than the inner end 24 by a cone shape with an angle of a. When the pin 2 is installed in the pin groove 11, the pin groove 11 and the pin 2 are in an interference fit.

[0046] When the pin 2 is installed in the pin slot 11, the pin slot 11 and the pin 2 are interference fit. In embodiment 4, angles a and b are generally the same, with a small angular deviation allowed.

[0047] In this embodiment 4, just like in embodiment 1, glue is bonded in the gap between the pin groove 11 and the pin 2, so that the force-bearing area between the pin 2 and the pin groove 11 is larger, thereby being able to withstand greater pull-out force.

[0048] Example 5 uses a straight pin groove 11, a straight pin 2, and a conical wedge 4: like Figures 17-20 As shown in Embodiment 1, preferably, a groove 25 is provided at the inner end 24 of the pin 2, and a conical wedge 4 is installed in the groove 25.

[0049] This embodiment 5 has low precision requirements, and the angle of its conical wedge 4 can have a very large deviation. In use, first place the conical wedge 4 on the groove 25 of the pin 2, then insert the end of the pin 2 with the conical wedge 4 into the pin groove 11. The conical wedge 4 is loose until it contacts the inner end 112 of the groove. Once the conical wedge 4 contacts the inner end 112, continue to tap the pin 2 inwards, causing the conical wedge 4 to deform and enlarge the head of the groove 25. See details... Figure 19 This allows it to be firmly locked inside the groove 11, a structure similar to a woodworking wedge.

[0050] Example 5 has the advantages of low processing cost, convenient batch processing, and easy installation, while not requiring particularly high taper accuracy of the conical wedge block 4.

[0051] In this embodiment 5, just like in the above embodiments, glue is bonded in the gap between the pin groove 11 and the pin 2, so that the force-bearing area between the pin 2 and the pin groove 11 is larger, thereby being able to withstand greater pull-out force.

[0052] Example 6 uses an I-shaped slot 11 and key 2: Preferably, the pin groove 11 is T-shaped, the pin 2 is I-shaped, and the pin 2 matches the pin groove 11.

[0053] The I-shaped pin 2 in this embodiment has excellent mechanical properties and is also convenient for mass production.

[0054] Preferably, adhesive is bonded in the gap between the pin groove 11 and the pin 2. The adhesive is one or more of the following: steel bonding adhesive, metal structural AB adhesive, epoxy resin metal adhesive, and fast-drying metal adhesive. Other metal structural adhesives can also be used. Adhesive can be used to improve performance in all of the above embodiments 1-6.

[0055] Preferably, the pile end plate 1 has a welding bevel 14 around the outer periphery of the contact surface 13.

[0056] To facilitate the alignment of the two pile end plates 1 during installation, a positioning design is provided. Preferably, the pile end plate 1 has a positioning hole 12 on the contact surface 13, and positioning pins 3 are installed on the positioning holes 12 of the two pile end plates 1, with the positioning pins 3 tightly fitted to the positioning holes 12.

[0057] To facilitate the fixed installation of the pile end plate 1 onto the pile body, preferably, the pile end plate 1 is provided with a reinforcing bar tensioning hole 5. The reinforcing bar tensioning hole 5 is used to tension the pile end plate 1 onto the concrete pile body. Furthermore, the pile end plate 1 is made of metal, such as carbon steel. For different working conditions, the pile end plate 1 can be heat-treated to improve its performance.

[0058] To accommodate piles of different shapes, such as circular, square, and octagonal piles, the flange can preferably be circular, square, or octagonal in shape, so that the flange's shape matches the pile's shape. For example... Figures 24-25 It shows the square end plate of the pile body.

[0059] This embodiment should not be regarded as a limitation of the utility model, but any improvement made based on the spirit of the utility model should be within the protection scope of the utility model.

Claims

1. A bolt-type mechanical connection with integral load-bearing, comprising two pile end plates (1), characterized in that: The contact surfaces (13) of the two pile end plates (1) that fit together are provided with pin grooves (11) on the outer diameter square. The number of pin grooves (11) is greater than or equal to 2. The pin grooves (11) are connected to the outer periphery of the pile end plate (1). The pin grooves (11) near the contact surface (13) are narrower than the pin grooves (11) far from the contact surface (13). Pins (2) are installed in the corresponding pin grooves (11) on the two pile end plates (1).

2. The integrally stressed pin-type mechanical connection according to claim 1, characterized in that: The pin groove (11) is a dovetail groove. The pin (2) has an inwardly concave first inclined surface (21) and a second inclined surface (22) in the middle position. The shape of the pin (2) matches the pin groove (11) of the two pile end plates (1) which correspond to each other. The inner and outer widths of the pin groove (11) and the pin (2) are the same. The pin (2) and the pin groove (11) are in clearance fit or transition fit.

3. The integrally stressed pin-type mechanical connection according to claim 2, characterized in that: The pin (2) has a groove (25) at the inner end (24) of the pin, and a conical wedge (4) is installed in the groove (25).

4. The integrally stressed pin-type mechanical connection according to claim 1, characterized in that: The pin groove (11) is a dovetail groove. The pin (2) has an inwardly concave first inclined surface (21) and a second inclined surface (22) in the middle position. The shape of the pin (2) matches the pin groove (11) on the top and bottom of the two pile end plates (1). The inner and outer widths of the pin groove (11) are the same. The outer end (23) of the pin (2) is wider than the inner end (24) of the pin by a cone shape with an angle of α. When the pin (2) is installed in the pin groove (11), the contact surface between the pin (2) and the pin groove (11) is interference fit.

5. The integrally stressed pin-type mechanical connection according to claim 1, characterized in that: The pin groove (11) is a dovetail groove. The pin (2) has an inwardly concave first inclined surface (21) and a second inclined surface (22) in the middle position. The shape of the pin (2) matches the pin grooves (11) on the top and bottom of the two pile end plates (1). The outer end (111) of the pin groove (11) is wider than the inner end (112) by a cone shape with an angle of b. The inner and outer widths of the pin (2) are the same. When the pin (2) is installed in the pin groove (11), the contact surface between the pin (2) and the pin groove (11) is interference fit.

6. The integrally stressed pin-type mechanical connection according to claim 1, characterized in that: The pin groove (11) is a dovetail groove. The pin (2) has an inwardly concave first inclined surface (21) and a second inclined surface (22) in the middle position. The shape of the pin (2) matches the pin grooves (11) on the top and bottom of the two pile end plates (1). The outer end (111) of the pin groove (11) is wider than the inner end (112) by a cone shape with an angle of b. The outer end (23) of the pin (2) is wider than the inner end (24) by a cone shape with an angle of a. When the pin (2) is installed in the pin groove (11), the pin groove (11) and the pin (2) are in an interference fit.

7. The integrally stressed pin-type mechanical connection according to claim 1, characterized in that: The pin slot (11) is T-shaped, and the pin (2) is I-shaped. The pin (2) and the pin slot (11) are matched.

8. A bolt-type mechanical connection subjected to integral force according to any one of claims 1-7, characterized in that: Adhesive is bonded in the gap between the pin groove (11) and the pin (2). The adhesive is selected from one or more of the following: steel bonding adhesive, metal structure AB adhesive, epoxy resin metal adhesive, and fast-drying metal adhesive.

9. A bolt-type mechanical connection subjected to integral force according to claim 8, characterized in that: The pile end plate (1) has a welding bevel (14) around the outer periphery of the contact surface (13).

10. A bolt-type mechanical connection subjected to integral force according to claim 8, characterized in that: The pile end plate (1) has a positioning hole (12) on the contact surface (13). Positioning pins (3) are installed on the positioning holes (12) of the two pile end plates (1) at the same time. The positioning pins (3) are tightly fitted with the positioning holes (12).

Images