A self-locking precast pier connection structure and its assembly and disassembly method

Abstract

The present invention discloses a self-locking precast pier connection structure and its assembling and disassembling method. In the self-locking connection state, the lower self-locking column is placed in the cavity of the self-locking groove, and the conical groove is sleeved on the conical platform. After the two layers of the first flanges of the self-locking column are rotated clockwise or counterclockwise by a certain angle, they are respectively placed in the two-layer annular groove cavities under the first flange of the bearing platform. The bottom surface of the upper column completely covers the self-locking groove on the top surface of the bearing platform. A sealing and water-stopping strip sleeved around the self-locking groove is arranged between the bottom surface of the upper column and the top surface of the bearing platform. A cement and yellow sand mixture is scattered between the top surface of the bearing platform inside the sealing and water-stopping strip and the bottom surface of the upper column. A ring of cement mortar is poured between the outside of the sealing and water-stopping strip and the outside of the bottom of the upper main body.

Description

Technical Field

[0001] The invention belongs to the technical field of assembled bridge construction, and in particular relates to a self-locking prefabricated pier connection structure and an assembling and disassembling method thereof. Background Art

[0002] The existing Chinese patent (CN211848867U) is a tooth groove type prefabricated bridge pier and abutment connection structure.

[0003] It mainly includes a plurality of lower shear teeth extending outward along the side surface of the bottom of the pier, and a groove for inserting the pier arranged on the pier cap, a plurality of upper shear teeth extending inward from the periphery of the top of the groove, the inner side of the upper shear teeth constitutes a pier insertion channel, the gap between adjacent upper shear teeth constitutes a lower shear tooth insertion channel, and the lower part of the upper shear teeth constitutes a lower shear tooth accommodating chamber; a matching pair is arranged on the contact surface between the bottom of the pier and the groove; when the lower shear tooth rotates to the bottom of the upper shear tooth, the first hollow tube in the upper shear tooth, the second hollow tube in the lower shear tooth, and the third hollow tube in the pier cap corresponding to each first hollow tube position respectively constitute a connecting rod insertion channel that runs through from top to bottom. Although this structure is simple in construction, has clear force, is safe and reliable, has a simple process, and a short construction period, there is still room for improvement;

[0004] When the pier column is connected to the tenon, since the tenon is cylindrical, it may not be completely aligned, and fine-tuning may be required during the actual lifting process; it is difficult to quickly align the upper and lower shear teeth and the hollow pipes of the cap, which also takes time; the connecting rod insertion channel does not perform any prestressing and tensioning treatment, but simply places steel bars, which cannot guarantee a large horizontal shear bearing capacity, and can only play a limiting role. In addition, the horizontal size of the shear teeth is small, and drilling will cause stress concentration, increasing the possibility of damage; there is no much description on how to rotate the pier column, which invisibly reduces the feasibility of this structure; this structure has 10 hollow shear tooth tubes and 10 tooth grooves, and there are many gaps between the pier column and the cap. It is difficult to completely seal it with grouting, and it will inevitably be eroded by rainwater; and once grouting is sealed, the pier column and the cap become an integral structure until it is destroyed, and it is not convenient to disassemble and repair it separately in the later stage. Therefore, can we consider a connection structure and process without grouting and sealing, so as to facilitate the disassembly of the pier column and the cap in the future, and maintain the integrity of both after disassembly. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a self-locking prefabricated pier connection structure and an assembly and disassembly method thereof.

[0006] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0007] On the one hand, the present invention provides a self-locking precast pier connection structure, which includes a self-locking groove opened on the top surface of the bearing platform and a pier column that is buckled in the self-locking groove with a certain gap left. The top view cross-section of the cavity of the self-locking groove is in the shape of an external gear. At the center point of the bottom of the cavity of the self-locking groove, there is an upward convex conical platform, and the self-locking groove is distributed with a plurality of second flanges in the shape of an internal gear, and a ring-shaped cavity is respectively opened at the bottom and the middle of it;

[0008] The pier column includes an upper column body and a lower self-locking column that are vertically and coaxially connected. The cross-sectional diameter of the upper main body is larger than that of the lower self-locking column. A conical groove matching the conical platform is opened at the bottom of the lower self-locking column. The lower self-locking column is configured with two upper and lower layers of a plurality of first flanges distributed in the shape of an external gear that match the top view cross-section of the cavity of the self-locking groove;

[0009] In the self-locking connection state, the lower self-locking column is placed in the cavity of the self-locking groove and the conical groove is sleeved on the conical platform. After the two layers of the first flanges are synchronously rotated clockwise or counterclockwise by a certain angle, they are respectively placed in the two ring-shaped cavities at the bottom and the middle of the self-locking groove and are buckled between the upper and lower adjacent second flanges. The bottom surface of the upper column body completely covers the self-locking groove on the top surface of the bearing platform. A sealing and water-stop strip sleeved around the self-locking groove is arranged between the bottom surface of the upper column body and the top surface of the bearing platform. A cement and yellow sand mixture is scattered between the top surface of the bearing platform inside the sealing and water-stop strip and the bottom surface of the upper column body. A circle of cement mortar is poured between the outside of the sealing and water-stop strip and the outside of the bottom of the upper main body.

[0010] Further, six tooth-shaped vertical cavities extending outward are uniformly opened on the circumferential inner wall of the self-locking groove. The vertical cavities are respectively connected with the two ring-shaped cavities in the vertical direction. A second flange extending towards the center of the self-locking groove is formed between adjacent tooth-shaped vertical cavities, and the upper and lower adjacent second flanges located in the same vertical direction are located between adjacent vertical cavities;

[0011] The lower self-locking column is respectively and uniformly provided with two layers of the first flanges that extend outward and are each configured with six tooth-shaped ones. The upper and lower adjacent first flanges are in the same vertical direction, and the cross-sectional dimension of the first flange matches the cross-sectional dimension of the vertical cavity.

[0012] Further, the lower self-locking column is uniformly provided with two layers of the first flanges that extend outward and are each configured with three tooth-shaped ones. The upper and lower adjacent first flanges are vertically offset from each other and there is a certain width gap between the upper and lower adjacent first flanges;

[0013] The circumferential inner wall of the self-locking groove is evenly provided with two layers of vertically extending cavities that extend outward and each layer is configured with three tooth-shaped cavities. A second flange is formed between adjacent vertically extending cavities in the same layer. The vertically adjacent vertically extending cavities are vertically offset from each other and there is a certain width gap between the vertically adjacent vertically extending cavities. The annular cavity located in the upper layer in the self-locking groove horizontally communicates with the vertically extending cavities in the upper and lower layers, and the annular cavity located in the upper layer horizontally communicates with the vertically extending cavities located in the lower layer;

[0014] Alternatively, the circumferential inner wall of the self-locking groove is evenly provided with six tooth-shaped vertically extending cavities that extend outward. The vertically extending cavities are respectively connected to the two layers of annular cavities along the vertical direction. A second flange that extends towards the center of the self-locking groove is formed between adjacent tooth-shaped vertically extending cavities, and the vertically adjacent second flanges are located between adjacent vertically extending cavities in the same vertical direction.

[0015] Further, a reserved hole is respectively provided on both sides of the upper column body. The extension line direction between the two reserved holes passes through the axis of the upper column body, and the center line of the reserved hole and a first flange are located on the same vertical plane passing through the axis of the upper column body; At least one positioning pin is provided on the top surface of the bearing platform. The positioning pin and the reserved hole respectively form a rotation angle for measuring the pier column with the axis of the upper column body.

[0016] Further, a steel film is wrapped on the surface of the lower self-locking column.

[0017] Further, the thickness and the lateral depth between the two layers of annular cavities are the same, and the thickness and the lateral outward convex length between the two layers of first flanges are the same.

[0018] Further, bolt reserved holes for fixing the jacking mechanism are provided on the top surface of the bearing platform. The jacking mechanism is configured to jack and connect to a steel plate in the reserved hole so that the pier column rotates by a certain angle;

[0019] The jacking mechanism includes an angle steel fixedly connected to the bolt reserved hole and a jack fixedly connected to the angle steel. The free end of the jack is configured to jack and connect to a strip-shaped steel plate in the reserved hole.

[0020] Further, a water stop groove is provided around the self-locking groove on the surface of the bearing platform, and a water stop belt is laid in the groove.

[0021] Further, the conical platform is integrally cast with the bearing platform by concrete, or the conical platform is a detachable and assembled concrete or steel conical platform.

[0022] On the other hand, the present invention provides a method for assembling and disassembling a connection structure of a self-locking precast pier, including the following steps:

[0023] Step 1: Fabricate each precast component at the factory according to the design drawings: pier columns, conical platforms inside the self-locking grooves of the bearing platforms, pencil-shaped steel plates, support steel plates and supports, angle steels, and anchor bolts, and transport them to the construction site;

[0024] Step 2: Pour the bearing platform and the self-locking groove on-site according to the design drawings. After the bearing platform is completed, install and fix the conical platform at the center position inside the self-locking groove of the bearing platform to ensure that the conical platform does not shake;

[0025] Step 3: Drive the first positioning pin on the top surface of the bearing platform according to the design drawings as a mark for the subsequent rotation angle of the pier column;

[0026] Step 4: Open a circular waterstop groove around the self-locking groove on the surface of the bearing platform, and lay a circle of waterstops in the groove as the first line of defense for waterproofing;

[0027] Step 5: Spread 5 mm thick 1:3 cement yellow sand within the area covered by the bottom surface of the pier column on the surface of the bearing platform to reduce the friction between the pier column and the bearing platform and prevent damage to the waterstop strip when rotating the pier column;

[0028] Step 6: Before hoisting the pier column, apply a layer of machine oil on the surface of the conical platform to reduce the friction between the conical groove at the bottom of the pier column and the conical platform, facilitating the subsequent rotation of the pier column;

[0029] Step 7: Hoist the pier column directly above the self-locking groove, and ensure that the conical groove at the bottom of the pier column aligns with the conical platform. The double-layer outer gear-shaped first flange at the bottom of the pier column faces the cavity of the self-locking groove with an outer gear shape. Slowly and evenly lower it vertically until it is in full contact with the upper surface of the bearing platform, the bottom of the self-locking groove, and the surface of the conical platform. Drive the second positioning pin on the surface of the pier column at an angle of 30° with the first positioning pin;

[0030] Step 8: Install precast angle steels on the embedded bolts horizontally on the surface of the bearing platform. Insert the precast pencil-shaped strip steel plates and support steel plates into the reserved holes on both sides of the pier column. Set up jacks between the pencil-shaped strip steel plates and the angle steels to ensure that the jacks abut against the strip steel plates and the angle steels front and back, and add several steel plates between the angle steels and the pencil-shaped strip steel plates to adjust the distance;

[0031] Step 9: Using the first positioning pin on the surface of the bearing platform as a reference, slowly and evenly rotate the pier column 30° by pushing with the jack. After rotation, ensure that the second positioning pin of the pier column aligns with the first positioning pin on the surface of the bearing platform. The double-layer first flange at the bottom of the pier column rotates from the self-locking groove of the bearing platform into the annular groove cavity of the second flange and abuts against the protruding trapezoidal first flange for snap locking;

[0032] Step 9: After snap locking, pour and apply a circle of cement mortar at the contact surface and the edge between the pier column and the bearing platform as the second line of defense for waterproofing;

[0033] Step Ten: The on-site assembly of the self-locking precast bridge pier is completed;

[0034] Step Eleven: If disassembly is required later, chisel the cement mortar, install and anchor the angle steel at the embedded bolt on the other side of the top surface of the bearing platform, use the jack to rotate the pier column reversely by 30°, and slowly and evenly lift out the pier column after rotation to complete the disassembly.

[0035] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0036] The self-locking precast bridge pier connection structure and the assembly and disassembly method provided by the present invention improve the integrity, seismic and shear resistance performance of the precast bridge pier connection structure through the self-locking groove, the second flange, the two-layer annular groove cavity, the two-layer first flanges of the lower self-locking column, the upper column body and the covering and sealing of the top surface of the bearing platform. By prefabricating the bridge pier in a precast factory and casting and assembling the bearing platform on-site, it is easy to realize the standardized production of components, and the quality is easy to control, which is convenient for transportation and on-site assembly, can save the on-site hoisting cost, improve the on-site assembly efficiency, and is more convenient for later demolition. Description of the Drawings

[0037] Figure 1 It is a schematic structural diagram of a self-locking precast bridge pier connection structure provided by an embodiment of the present invention;

[0038] Figure 2 It is a schematic structural diagram of a self-locking groove of a bearing platform provided by an embodiment of the present invention;

[0039] Figure 3 It is a schematic structural diagram of a lower self-locking column of a pier column provided by an embodiment of the present invention;

[0040] Figure 4 It is a top view of a self-locking groove of a bearing platform provided by an embodiment of the present invention;

[0041] Figure 5 It is a top view of a self-locking groove and a lower self-locking column provided by an embodiment of the present invention;

[0042] Figure 6 It is a top view of a bridge pier connection structure provided by an embodiment of the present invention;

[0043] Figure 7 It is a three-dimensional schematic diagram of a pier column provided by an embodiment of the present invention;

[0044] Figure 8 It is a three-dimensional schematic diagram of a self-locking groove of a bearing platform provided by an embodiment of the present invention;

[0045] Figure 9 It is a cross-sectional view of a self-locking precast bridge pier connection structure provided by an embodiment of the present invention;

[0046] Figure 10 The top view of a self-locking groove of a bearing platform provided by an embodiment of the present invention.

[0047] In the figure:

[0048] 1. Bearing platform; 2. Pier column; 3. Self-locking groove; 4. Second flange; 5. Annular groove cavity; 6. Frustum of a cone; 7. Waterstop; 8. Cement mortar; 9. Lower self-locking column; 10. First flange; 11. Upper column body; 12. Reserved hole; 13. Conical groove; 14. Steel film; 15. Bolt reserved hole; 16. Angle steel; 17. Jack; 18. Steel plate; 19. Positioning nail; 20. Cement and yellow sand; 21. Waterstop strip groove; 22. Support rod; 23. Vertical cavity. Detailed implementation manners

[0049] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0050] Embodiment

[0051] As shown in Figure 1 , Figure 2 and Figure 3 , an embodiment of the present invention provides a self-locking precast pier connection structure, which includes a self-locking groove 3 opened on the top surface of the bearing platform 1 and a pier column 2 buckled in the self-locking groove 3. Among them, there is a certain gap or clearance, such as 5-10 mm, etc., between the pier column 2 and the self-locking groove 3 to facilitate the docking operation during disassembly and assembly.

[0052] The cross-sectional view of the cavity of the self-locking groove 3 in the vertical direction is in the shape of an external gear. At the center point of the bottom of the cavity of the self-locking groove 3, there is a frustum of a cone 6 protruding upward, which can be used to support and rotate the pier column 2 that cooperates with the frustum of a cone 6. The self-locking groove 3 is distributed with a plurality of second flanges 4 in the shape of an internal gear. A vertical cavity 23 is formed between adjacent second flanges 4. A ring-shaped groove cavity 5 is respectively opened on the circumferential side walls at the bottom and middle of the self-locking groove 3, and the ring-shaped groove cavity 5 is communicated with the vertical cavity 23.

[0053] The pier column 2 includes an upper column body 11 and a lower self-locking column 9 connected coaxially in the vertical direction. The cross-sectional diameter of the upper main body is larger than the cross-sectional diameter of the lower self-locking column 9, and the upper main body can cover the top surface of the self-locking groove 3. A conical groove 13 that cooperates with the frustum of a cone 6 is opened at the bottom of the lower self-locking column 9. The lower self-locking column 9 is provided with multiple first flanges 10 distributed in an external gear shape that match the cross-sectional view of the cavity of the self-locking groove 3 in the vertical direction. The shape and size of the first flanges 10 are preferably matched with the vertical cavity 23, the second flanges 4, etc. of the self-locking groove 3 to facilitate better insertion / extraction downward and buckling below the second flanges 4.

[0054] In the self-locking connection state, the lower self-locking column 9 is placed in the cavity of the self-locking groove 3, and the conical groove 13 is sleeved on the conical platform 6. After the two layers of the first flanges 10 are synchronously rotated clockwise or counterclockwise by a certain angle, they are respectively placed in the two-layer annular groove cavities 5 at the bottom and the middle of the self-locking groove 3 and are buckled between the adjacent upper and lower second flanges 4. The bottom surface of the upper column body 11 completely covers the self-locking groove 3 on the top surface of the bearing platform 1. A sealing and water-stopping strip sleeved around the self-locking groove 3 is arranged between the bottom surface of the upper column body 11 and the top surface of the bearing platform 1. The sealing and water-stopping strip is arranged in the sealing and water-stopping strip groove 21. A mixture of cement and yellow sand 20 is scattered between the top surface of the bearing platform 1 inside the sealing and water-stopping strip and the bottom surface of the upper column body 11. A ring of cement mortar 8 is poured between the outside of the sealing and water-stopping strip and the outside of the bottom of the upper main body.

[0055] As Figure 4 and Figure 5 shown, in some embodiments, six tooth-shaped vertical cavities 23 extending outward are uniformly formed on the circumferential inner wall of the self-locking groove 3. The vertical cavities 23 are respectively communicated with the two-layer annular groove cavities 5 in the vertical direction. A second flange 4 extending towards the center of the self-locking groove 3 is formed between adjacent tooth-shaped vertical cavities 23, and the adjacent upper and lower second flanges 4 are located between adjacent vertical cavities 23 in the same vertical direction.

[0056] The lower self-locking column 9 is respectively and uniformly provided with two layers of first flanges 10 extending outward and each layer is provided with six tooth-shaped ones. The adjacent upper and lower first flanges 10 are in the same vertical direction, and the cross-sectional dimension of the first flange 10 matches the cross-sectional dimension of the vertical cavity 23.

[0057] Specifically, relative to the center of the self-locking groove 3, the tooth-shaped width angle of the second flange 4 is 30°, and the tooth-shaped width angle of the vertical cavity 23 is 30°. Relative to the center of the lower self-locking column 9, the tooth-shaped width angle of the first flange 10 is 30°. For better assembly and disassembly, the tooth-shaped width angle of the first flange 10 can also be considered slightly smaller, such as 28°, etc., so as to leave a certain gap between the pier column 2 and the self-locking groove 3.

[0058] As Figure 7 、 Figure 8 and Figure 9 shown, the lower self-locking column 9 is uniformly provided with two layers of first flanges 10 extending outward and each layer is provided with three tooth-shaped ones along the circumference. The adjacent upper and lower first flanges 10 are vertically offset from each other and there is a certain width gap between the adjacent upper and lower first flanges 10.

[0059] In this embodiment, as a specific pier structure, which is used to match with the lower self-locking column 9, two layers of vertically extending cavities 23 with three tooth-shaped protrusions on each layer are evenly arranged on the circumferential inner wall of the self-locking groove 3. The second flange 4 is formed between adjacent vertically extending cavities 23 on the same layer. The vertically adjacent cavities 23 are vertically offset from each other and there is a certain width gap between the vertically adjacent cavities 23. The annular cavity 5 in the upper layer of the self-locking groove 3 horizontally communicates with the vertically extending cavities 23 in the upper and lower layers. The annular cavity 5 in the upper layer horizontally communicates with the vertically extending cavities 23 in the lower layer. In order to enable smooth rotational installation, the width angles of the gaps between adjacent upper and lower first flanges 10 and between adjacent upper and lower vertically extending cavities 23 are the same.

[0060] Specifically, as Figure 10 shown, relative to the center of the self-locking groove 3, the tooth-shaped width angle of the second flange 4 is 90°, the width angle between two second flanges 4 is 30°, which is the vertically extending cavity 23, and the tooth-shaped width angle of the vertically extending cavity 23 is 30°, and it can match with the first flange 10. There is a certain width gap between adjacent upper and lower vertically extending cavities 23 in the horizontal direction, that is, a rotation angle is required, which can be designed as a 30° angle width. It should be noted that the width angles of the gaps between adjacent upper and lower first flanges 10 and between adjacent upper and lower vertically extending cavities 23 are the same.

[0061] As a deformation of the pier structure in this embodiment, the tooth-shaped width angle of the second flange 4 is 30°, the width angle between two second flanges 4 is 90°, which is the vertically extending cavity 23, and the tooth-shaped width angle of the vertically extending cavity 23 is 90°.

[0062] Relative to the center of the lower self-locking column 9, the tooth-shaped width angle of the first flange 10 is 30°, and the gap between adjacent upper and lower first flanges 10 can be designed as a 30° angle gap.

[0063] For better assembly and disassembly, the tooth-shaped width angle of the first flange 10 can also be considered slightly smaller, such as 28°, etc., so as to leave a certain gap between the pier column 2 and the self-locking groove 3.

[0064] As another specific pier structure, which is used to match with the lower self-locking column 9, six tooth-shaped vertically extending cavities 23 that extend outward are evenly arranged on the circumferential inner wall of the self-locking groove 3. The vertically extending cavities 23 are respectively connected to the annular cavities 5 in two layers in the vertical direction. A second flange 4 that extends towards the center of the self-locking groove 3 is formed between adjacent tooth-shaped vertically extending cavities 23, and the adjacent upper and lower second flanges 4 in the same vertical direction are located between adjacent vertically extending cavities 23.

[0065] Relative to the center of the lower self-locking column 9, the tooth-shaped width included angle of the first flange 10 is 30°, and a certain width gap is left between the upper and lower adjacent first flanges 10, which can be designed as a 30° included angle gap.

[0066] Relative to the center of the self-locking groove 3, the tooth-shaped width included angle of the second flange 4 is 30°, the width included angle between two second flanges 4 is 30°, that is, the vertical cavity 23, and the tooth-shaped width included angle of the vertical cavity 23 is 30°, and it can match the first flange 10. At this time, there are six vertical cavities 23 in each layer, and the upper and lower layers of vertical cavities 23 are vertically aligned and communicated; in this embodiment, the rotation angle required is along the clockwise or counterclockwise direction, and in the annular cavity groove, turning from one vertical cavity 23 to another adjacent vertical cavity 23 can be designed as a 30° included angle width.

[0067] Reference Figure 1 , a reserved hole 12 is respectively opened on both sides of the upper column body 11, the extension line direction between the two reserved holes 12 passes through the axis of the upper column body 11, and the reserved hole 12 and the center line of a first flange 10 are located on the same vertical plane passing through the axis of the upper column body 11; at least one positioning nail 19 is arranged on the top surface of the bearing platform 1, and a rotation included angle for measuring the pier column 2 is formed between the positioning nail 19 and the axis of the upper column body 11 respectively.

[0068] Reference Figure 3 , a steel film 14 is wrapped on the surface of the lower self-locking column 9.

[0069] In this embodiment, bolt reserved holes 15 for fixing the jacking mechanism are opened on the top surface of the bearing platform 1, and the jacking mechanism is configured to jack and connect a steel plate 18 in the reserved hole 12 to rotate the pier column 2 by a certain angle. Among them, the jacking mechanism includes an angle steel 16 fixedly connected to the bolt reserved hole 15, a jack 17 fixedly connected to the angle steel 16, and the free end of the jack 17 is configured to jack and connect to a strip-shaped steel plate 18 in the reserved hole 12. In order to better seal and waterproof the self-locking groove 3, a groove for a water stop 7 is opened around the self-locking groove 3 on the surface of the bearing platform 1, and a water stop 7 is laid in the groove.

[0070] On the other hand, reference Figure 6 , the embodiment of the present invention also provides an assembling and disassembling method for a self-locking type precast pier connection structure, including the following steps:

[0071] Step 1: Fabricate each precast component in the factory according to the design drawings: the pier column 2, the conical frustum 6 in the self-locking groove 3 of the bearing platform 1, the pencil-shaped steel plate 18, the support steel plate 18 and the support, the angle steel 16 and the anchor bolts, and transport them to the construction site;

[0072] Step 2: Pour the bearing platform 1 and the self-locking groove 3 on-site according to the design drawings. After the bearing platform 1 is completed, install and fix the conical platform 6 at the center position inside the self-locking groove 3 of the bearing platform 1 to ensure that the conical platform 6 does not shake.

[0073] Step 3: Drive the first positioning pin 19 into the top surface of the bearing platform 1 according to the design drawings as a mark for the subsequent rotation angle of the pier column 2.

[0074] Step 4: Open a groove for the waterstop 7 around the self-locking groove 3 on the surface of the bearing platform 1, and lay a circle of waterstop 7 in the groove as the first line of defense against water.

[0075] Step 5: Spread 5 mm thick 1:3 cement yellow sand within the area covered by the bottom surface of the pier column 2 on the surface of the bearing platform 1 to reduce the friction between the pier column 2 and the bearing platform 1 and prevent damage to the waterstop strip when rotating the pier column 2. At the same time, when the waterproof function of the second-layer cement mortar 8 fails, water enters between the bottom surface of the pier column 2 and the bearing platform 1, and the cement yellow sand mixture solidifies to form a solid, which also plays a waterproof role.

[0076] Step 6: Before hoisting the pier column 2, apply a layer of machine oil on the surface of the conical platform 6 to reduce the friction between the conical groove 13 at the bottom of the pier column 2 and the conical platform 6, facilitating the subsequent rotation of the pier column 2.

[0077] Step 7: Hoist the pier column 2 directly above the self-locking groove 3, and ensure that the conical groove 13 at the bottom of the pier column 2 is aligned with the conical platform 6. The double-layer outer gear-shaped first flange 10 at the bottom of the pier column 2 is aligned with the cavity of the self-locking groove 3 with an outer gear shape. Slowly and evenly lower it vertically until it is in full contact with the upper surface of the bearing platform 1, the bottom of the self-locking groove 3, and the surface of the conical platform 6. Drive the second positioning pin at an angle of 30° with the first positioning pin on the surface of the pier column 2.

[0078] Step 8: Install the precast angle steel 16 on the embedded bolts on the transverse direction of the surface of the bearing platform 1. Insert the precast pencil-shaped strip steel plate 18 and the support steel plate 18 into the reserved holes 12 on both sides of the pier column 2. Set the jack 17 between the pencil-shaped strip steel plate 18 and the angle steel 16 to ensure that the jack 17 abuts against the strip steel plate 18 and the angle steel 16 before and after. Add several steel plates 18 between the angle steel 16 and the pencil-shaped strip steel plate 18 for adjusting the distance, and support rods 22 can also be set between the steel plates 18.

[0079] Step 9: Taking the first positioning pin 19 on the surface of the bearing platform 1 as a reference, use the jack 17 to push and slowly and evenly rotate the pier column 2 by 30°. After rotation, ensure that the second positioning pin of the pier column 2 is aligned with the first positioning pin 19 on the surface of the bearing platform 1. The double-layer first flange 10 at the bottom of the pier column 2 rotates from the self-locking groove 3 of the bearing platform 1 into the annular cavity of the second flange 4 and abuts against the protruding trapezoidal first flange 10 for snap locking.

[0080] Step Nine: After the buckle is locked, apply a circle of cement mortar 8 at the contact surface and the edge between the pier column 2 and the bearing platform 1 as the second line of defense for waterproofing;

[0081] Step Ten: The on-site assembly of the self-locking precast bridge pier is completed;

[0082] Step Eleven: If disassembly is required subsequently, chisel the cement mortar 8, install and anchor the angle steel 16 at the embedded bolt on the other side of the surface of the bearing platform 1, use the jack 17 to rotate the pier column 2 counterclockwise by 30°, and slowly and evenly lift out the pier column 2 after rotation to complete the disassembly.

[0083] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0084] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0085] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can still be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A self-locking precast pier connection structure, characterized in that, It includes a self-locking groove opened on the top surface of the bearing platform, and a pier column clamped in the self-locking groove with a certain gap. The top view cross-section of the cavity of the self-locking groove is in the shape of an external gear. At the center point of the bottom of the cavity of the self-locking groove, there is a conical platform protruding upward. And the self-locking groove is distributed with a plurality of second flanges in the shape of an internal gear, and an annular groove cavity is respectively opened at its bottom and middle parts; The pier column includes an upper column body and a lower self-locking column connected coaxially in the vertical direction. The cross-sectional diameter of the upper column body is larger than that of the lower self-locking column. A conical groove matching with the conical platform is opened at the bottom of the lower self-locking column. The lower self-locking column is configured with two upper and lower layers of a plurality of first flanges distributed in the shape of an external gear matching the top view cross-section of the cavity of the self-locking groove; In the self-locking connection state, the lower self-locking column is placed in the cavity of the self-locking groove and the conical groove is sleeved on the conical platform. After the two layers of the first flanges are synchronously rotated clockwise or counterclockwise by a certain angle, they are respectively placed in the two annular groove cavities at the bottom and middle of the self-locking groove and clamped between the upper and lower adjacent second flanges. The bottom surface of the upper column body completely covers the self-locking groove on the top surface of the bearing platform. A sealing and water-stop strip sleeved around the self-locking groove is arranged between the bottom surface of the upper column body and the top surface of the bearing platform. A cement and sand mixture is scattered between the top surface of the bearing platform inside the sealing and water-stop strip and the bottom surface of the upper column body. A circle of cement mortar is poured between the outside of the sealing and water-stop strip and the outside of the bottom of the upper column body; A reserved hole is respectively opened on both sides of the upper column body. The extension line direction between the two reserved holes passes through the axis of the upper column body, and the center line of the reserved hole and one of the first flanges are located in the same vertical plane passing through the axis of the upper column body; At least one positioning nail is arranged on the top surface of the bearing platform. The positioning nail and the reserved hole respectively form a rotation angle for measuring the pier column with the axis of the upper column body; A layer of steel film is wrapped on the surface of the lower self-locking column; Bolt reserved holes for fixing the jacking mechanism are opened on the top surface of the bearing platform. The jacking mechanism is configured to jack and connect to a steel plate in the reserved hole so that the pier column rotates by a certain angle; The jacking mechanism includes an angle steel fixedly connected to the bolt reserved hole, and a jack fixedly connected to the angle steel. The free end of the jack is configured to jack and connect to a strip-shaped steel plate in the reserved hole.

2. The self-locking precast pier connection structure according to claim 1, wherein Six tooth-shaped vertical cavities extending outward are uniformly opened on the circumferential inner wall of the self-locking groove. The vertical cavities are respectively communicated with the two annular groove cavities in the vertical direction. A second flange extending towards the center of the self-locking groove is formed between adjacent tooth-shaped vertical cavities. And the upper and lower adjacent second flanges located in the same vertical direction are between adjacent vertical cavities; The lower self-locking column is respectively and uniformly provided with two layers of tooth-shaped first flanges extending outward in the circumferential direction, and each layer is configured with six. The upper and lower adjacent first flanges are in the same vertical direction, and the cross-sectional size of the first flange matches the cross-sectional size of the vertical cavity.

3. The self-locking precast pier connection structure according to claim 1, characterized in that The lower self-locking column is uniformly provided with two layers of first flanges extending outward in the circumferential direction, and each layer is configured with three tooth-shaped first flanges. The adjacent first flanges up and down are vertically offset from each other, and there is a certain width gap between the adjacent first flanges up and down. The circumferential inner wall of the self-locking groove is uniformly provided with two layers of vertically extending cavities extending outward, and each layer is configured with three tooth-shaped vertically extending cavities. The second flanges are formed between the adjacent vertically extending cavities in the same layer. The adjacent vertically extending cavities up and down are vertically offset from each other, and there is a certain width gap between the adjacent vertically extending cavities up and down. The annular cavity located in the upper layer in the self-locking groove horizontally communicates with the two layers of vertically extending cavities up and down, and the annular cavity located in the upper layer horizontally communicates with the vertically extending cavities located in the lower layer. Or the circumferential inner wall of the self-locking groove is uniformly provided with six tooth-shaped vertically extending cavities extending outward. The vertically extending cavities are respectively connected to the two layers of annular cavities in the vertical direction. A second flange extending towards the center of the self-locking groove is formed between the adjacent tooth-shaped vertically extending cavities, and the adjacent second flanges up and down are located between the adjacent vertically extending cavities in the same vertical direction.

4. The self-locking precast pier connection structure according to claim 2 or 3, characterized in that, The thickness and the lateral depth between the two layers of annular cavities are the same, and the thickness and the lateral convex length between the two layers of first flanges are the same.

5. The self-locking precast pier connection structure according to claim 4, characterized in that, A water stop groove is provided around the self-locking groove on the surface of the bearing platform, and a water stop is laid in the groove.

6. The self-locking precast pier connection structure according to claim 4, characterized in that, The frustum is integrally cast with the bearing platform by concrete, or the frustum is a detachable assembled concrete or steel frustum, but it needs to be firmly connected to the bearing platform.

7. A method for assembling and disassembling a self-locking precast pier connection structure according to any one of claims 1 to 6, characterized in that, It includes the following steps: Step 1: Fabricate each precast member in the factory according to the design drawings: the pier column, the frustum in the self-locking groove of the bearing platform, the pencil-shaped steel plate, the support steel plate and the support, the angle steel and the anchor bolts, and transport them to the construction site. Step 2: Pour the bearing platform and the self-locking groove on site according to the design drawings. After the bearing platform is completed, install and fix the frustum at the central position inside the self-locking groove of the bearing platform to ensure that the frustum does not shake. Step 3: Drive the first positioning nail on the top surface of the bearing platform according to the design drawings as a mark for the rotation angle of the subsequent pier column. Step 4: Provide a water stop groove around the self-locking groove on the surface of the bearing platform, and lay a water stop in the groove as the first line of defense against water. Step 5: Spread 5 mm thick 1:3 cement yellow sand on the area of the surface of the bearing platform covered by the bottom surface of the pier column to reduce the friction between the pier column and the bearing platform and prevent the water stop strip from being damaged when the pier column rotates. Step 6: Apply a layer of machine oil on the surface of the frustum before hoisting the pier column to reduce the friction between the conical groove at the bottom of the pier column and the frustum and facilitate the subsequent rotation of the pier column. Step 7: Hoist the pier column directly above the self-locking groove, and ensure that the conical groove at the bottom of the pier column is aligned with the frustum. The double-layer external gear-shaped first flanges at the bottom of the pier column face the cavity of the external gear-shaped self-locking groove. Slowly and evenly lower it vertically until it is in full contact with the upper surface of the bearing platform, the bottom of the self-locking groove, and the surface of the frustum. Drive a second positioning nail on the surface of the pier column at an angle of 30° with the first positioning nail. Step Eight: Install precast angle steel with embedded bolts on the transverse direction of the bearing platform surface. Insert the precast pencil-shaped strip steel plates and support steel plates into the reserved holes on both sides of the pier column. Set up jacks between the pencil-shaped strip steel plates and the angle steel to ensure that the jacks abut against the strip steel plates and the angle steel front and back. Then add several steel plates between the angle steel and the pencil-shaped strip steel plates to adjust the distance; Step Nine: Taking the first positioning nail on the bearing platform surface as the reference, use the jack to push and slowly and evenly rotate the pier column by 30°. After rotation, ensure that the second positioning nail of the pier column is aligned with the first positioning nail on the bearing platform surface. The double-layer first flange at the bottom of the pier column rotates from the self-locking groove of the bearing platform into the annular cavity of the second flange and abuts against the protruding trapezoidal first flange for snap locking; Step Ten: After snap locking, pour a circle of cement mortar at the contact surface and the edge between the pier column and the bearing platform as the second line of defense for waterproofing; Step Eleven: The on-site assembly of the self-locking precast bridge pier is completed; Step Twelve: If disassembly is required subsequently, chisel the cement mortar, install and anchor the angle steel at the embedded bolt on the other side of the bearing platform surface, repeat Step Seven and Step Eight, use the jack to reverse-rotate the pier column by 30°, and slowly and evenly lift the pier column out after rotation to complete the disassembly.

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