Prefabricated assembled concrete hollow pier in lock sleeve type threaded connection and construction technology

Abstract

The invention relates to a lock sleeve type threaded connection prefabricated assembled concrete hollow pier and a construction technology, the lock sleeve type threaded connection prefabricated assembled concrete hollow pier comprises a steel bar connecting piece, the steel bar connecting piece comprises a quick connection male head and a quick connection female head which are matched in an inserted connection mode, and the lock sleeve type threaded connection prefabricated assembled concrete hollow pier further comprises a bearing platform, a pier column and a cover beam; the upper end and the lower end of the pier column steel bar extend out of the concrete hollow pier column and are provided with quick-connection male heads. A bearing platform reinforcing steel bar extending upwards is arranged in the bearing platform, a cover beam reinforcing steel bar extending downwards is arranged in the cover beam, and the upper end of the bearing platform reinforcing steel bar and the lower end of the cover beam reinforcing steel bar are each provided with a quick-connection female head matched with the quick-connection male head in an inserted mode. The joints among the bearing platform, the pier column and the cover beam are simple in structure and clear in structural stress, sufficient strength, rigidity and energy dissipation capacity of the pier can be guaranteed, meanwhile, the steel bars are connected in an inserted connection mode, the connection quality is good, the situation that a conventional mechanical threaded connector needs the steel bars to rotate or move is avoided, and the construction cost is reduced. The problems that an existing mechanical connection mode is large in construction process difficulty, and the connection quality is difficult to guarantee are solved.

Description

Technical Field

[0001] The invention relates to a prefabricated assembled concrete hollow pier with locking sleeve type threaded connection and a construction process. Background Art

[0002] Concrete hollow piers have great strength and rigidity, and excellent seismic performance. They are widely used in high-intensity earthquake zones in my country. Compared with solid concrete piers, concrete hollow piers have light weight, low cost, and are easier to hoist. At present, the research and application of concrete hollow piers are mostly focused on cast-in-place concrete hollow piers, and there are fewer studies and applications on prefabricated assembled concrete hollow piers. In order to promote the use of prefabricated assembled concrete hollow piers, it is necessary to develop a prefabricated assembled concrete hollow pier connection method with good mechanical properties and convenient construction.

[0003] At present, the research and application of prefabricated assembly connection technology for bridge substructures is not extensive enough. The commonly used grouting sleeve connection has the disadvantages of high construction precision requirements, difficult to detect grouting quality, and extended construction period due to the solidification of grouting materials. The existing mechanical connection is mainly threaded sleeve joints. The traditional threaded joint is to first connect the straight threaded sleeve to the steel bar on one side of the thread. After the steel bar to be connected is in the docking position, the sleeve is rotated together with the steel bar to the thread side of the steel bar to be connected until the torque is reached. This connection method requires at least one side of the steel bar to be rotatable. The extended threaded joint that can adapt to the requirement of non-rotating steel bars has limited fault tolerance, so the application scenarios of mechanical connections are limited. In addition, during the prefabrication, hoisting and installation process of mechanical connection, there are problems such as steel bar position offset deformation, non-colinear steel bar connection trajectory lines, and incomplete fitting of connectors, which lead to connection difficulties, inconsistent steel bar spacing, tightening torque that cannot meet standard requirements, and difficult to ensure connection quality. Summary of the invention

[0004] The present invention makes improvements on the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a prefabricated assembled concrete hollow pier with a locking sleeve type threaded connection and a construction process.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a prefabricated assembled concrete hollow pier with a locking sleeve type threaded connection, including a steel bar connector, the steel bar connector includes a quick-connect male head and a quick-connect female head for plug-in cooperation, and also includes a cap, a concrete hollow pier column and a cap beam arranged in sequence from bottom to top, the interior of the concrete hollow pier column is provided with a pier column steel bar, the upper and lower ends of the pier column steel bar extend out of the concrete hollow pier column respectively, and the upper and lower ends of the pier column steel bar are both provided with a quick-connect male head; the interior of the cap is provided with a cap steel bar extending upward, the interior of the cap is provided with a cap beam steel bar extending downward, and the upper end of the cap steel bar and the lower end of the cap beam steel bar are both provided with a quick-connect female head for plugging and cooperating with the quick-connect male head.

[0006] Furthermore, the lower end of the cap beam steel bar and the upper end of the pedestal steel bar are both threadedly connected with the first sleeve, and the quick-connect female head at the lower end of the cap beam steel bar and the quick-connect female head at the upper end of the pedestal steel bar are both located inside the first sleeve; the upper and lower ends of the pier column steel bar are both threadedly connected with the second sleeve, and the quick-connect male heads at the upper and lower ends of the pier column steel bar are both threadedly connected with the second sleeve.

[0007] Furthermore, one end of the first sleeve facing the pier column reinforcement is internally threadedly connected with a threaded support sleeve for limiting the quick-connect female head, and the middle part of the threaded support sleeve facilitates the quick-connect male head to penetrate vertically.

[0008] Furthermore, the concrete hollow pier column is provided with variable cross-section sections at the pier top and the pier bottom.

[0009] Furthermore, the hollow size of the cross section of the pier top and the hollow size of the cross section of the pier bottom of the concrete hollow pier column are both smaller than the hollow size of the cross section of the middle part of the pier body.

[0010] Furthermore, there are two concrete hollow piers, and joints are formed between the top surface of the base and the bottom surface of each concrete hollow pier, and between the bottom surface of the cap beam and the top surface of each concrete hollow pier, and the joints are filled with mortar, and an adjustment component for adjusting the joint height is provided in the joint.

[0011] Furthermore, the adjustment component includes four adjustment screws distributed in a rectangular shape; in the adjustment component located in the joint between the top surface of the pedestal and the bottom surface of the concrete hollow pier, one end of the adjustment screw is threadedly connected to the top surface of the pedestal, and the other end of the adjustment screw is abutted against the bottom surface of the concrete hollow pier; in the adjustment component located in the joint between the bottom surface of the cap beam and the top surface of the concrete hollow pier, one end of the adjustment screw is threadedly connected to the bottom surface of the cap beam, and the other end of the adjustment screw is abutted against the top surface of the concrete hollow pier.

[0012] Furthermore, the joint reserves a gap with a height of 30 mm.

[0013] Furthermore, the pier column steel bars are evenly arranged on the periphery of the cross section of the concrete hollow pier column, and four pier column steel bars are evenly arranged on each side of the cross section of the concrete hollow pier column; a plurality of pedestal steel bars are arranged on the pedestal at positions corresponding to the positions of each concrete hollow pier column, and the positions of the plurality of pedestal steel bars correspond one to one with the pier column steel bars; a plurality of cap beam steel bars are arranged on the cap beam at positions corresponding to the positions of each concrete hollow pier column, and the positions of the plurality of cap beam steel bars correspond one to one with the pier column steel bars.

[0014] Furthermore, the pedestal and cap beam are both solid sections, and the pedestal, concrete hollow piers and cap beam are all prefabricated in the factory.

[0015] Another technical solution adopted by the present invention is: a construction process for prefabricated assembled concrete hollow piers with locking sleeve threaded connections, comprising the following steps: Step S1: Install the first sleeve on the upper end of the cap steel bar of the cap and the lower end of the cap steel bar of the cap beam, and then install the quick-connect female head and the threaded support sleeve in the first sleeve; Step S2: Install the second sleeve on the upper and lower ends of the pier column reinforcement, and then install the quick-connect male connector on the second sleeve; Step S3: Install the adjusting screws on the top of the pedestal and the bottom of the cap beam; Step S4: hoisting the concrete hollow pier column to the top surface of the cap, and then inserting the quick-connect male head of the concrete hollow pier column into the quick-connect female head in the first sleeve of the cap 1; Step S5: Screw the adjusting screw of the cap until the hollow concrete pier is perpendicular to the cap, and then tighten the quick-connect male head and the second sleeve; Step S6: hoisting the cap beam to the top surface of the concrete hollow pier column, and then inserting the quick-connect male head of the concrete hollow pier column into the quick-connect female head in the first sleeve of the cap beam; Step S7: Screw the adjusting screw of the cap beam until the cap beam is perpendicular to the concrete hollow pier column, and then tighten the quick-connect male head and the second sleeve; Step S8: Sealing grouting of the joints: supporting formwork around the joints between the hollow concrete pier column and the cap, and between the hollow concrete pier column and the cap beam, and filling the joints with mortar.

[0016] Furthermore, in step S1, after the quick-connect female connector and the threaded support sleeve are installed, anti-rust grease is injected into the quick-connect female connector.

[0017] Further, in step S3, the height between the top surface of the screw and the connection surface is adjusted to 30 mm.

[0018] Furthermore, in step S8, the bottom of the template is sealed with foam glue, and a grouting port and a vent hole are reserved on the top.

[0019] Compared with the prior art, the present invention has the following effects: the present invention is reasonably designed, the node structure between the abutment, pier column and cap beam is simple, the structural force is clear, and the bridge pier can be guaranteed to have sufficient strength, rigidity and energy consumption capacity. At the same time, the steel bars are connected by plug-in, and the connection quality is good, which avoids the situation that conventional mechanical threaded joints require the steel bars to rotate or move, and solves the problem that the existing mechanical connection method has difficult construction process and difficult to ensure connection quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention; Figure 2 yes Figure 1 AA section profile in; Figure 3 yes Figure 1 BB cross-section profile in ; Figure 4 yes Figure 1 The CC cross-sectional view in ; Figure 5 yes Figure 1 DD cross-sectional view in ; Figure 6 Schematic diagram of the structure of a steel bar connector in an embodiment of the present invention; Figure 7 It is a construction process flow chart in an embodiment of the present invention; Figure 8 Schematic diagram of the connection surface in the embodiment of the present invention.

[0021] In the figure: 1-cap; 2-concrete hollow pier; 3-cap beam; 4-cap steel bar; 5-pier steel bar; 6-cap steel bar; 7-second sleeve; 8-first sleeve; 9-quick-connect male head; 10-quick-connect female head; 11-threaded support sleeve; 12-adjusting screw. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] like Figures 1 to 8As shown, a prefabricated assembled concrete hollow pier with a locking sleeve type threaded connection of the present invention includes a steel bar connector, the steel bar connector includes a quick-connect male head 9 and a quick-connect female head 10 for plug-in cooperation, and also includes a cap 1, two concrete hollow pier columns 2 and a cap beam 3. The cap 1, the two concrete hollow pier columns 2 and the cap beam 3 are arranged in sequence from bottom to top, and each concrete hollow pier column 2 is provided with a pier column steel bar 5 inside, and the upper and lower ends of the pier column steel bar 5 extend out of the concrete hollow pier column 2 respectively, and the upper and lower ends of the pier column steel bar 5 are provided with a quick-connect male head 9; the inside of the cap 1 is provided with a cap steel bar 4 extending upward at a position corresponding to the position of each concrete hollow pier column 2, and the inside of the cap beam 3 is provided with a cap beam steel bar 6 extending downward at a position corresponding to the position of each concrete hollow pier column 2, and the upper end of the cap steel bar 4 and the lower end of the cap beam steel bar 6 are provided with a quick-connect female head 10 for plugging and cooperating with the quick-connect male head 9. The pedestal steel bars of the pedestal are connected to the pier steel bars of each concrete hollow pier column by plugging in quick-connect male and female heads, and the cap beam steel bars of the cap beam are connected to the pier steel bars of each concrete hollow pier column by plugging in quick-connect male and female heads, avoiding the situation in which conventional mechanical threaded joints require the steel bars to rotate or move, and solving the problems of difficult construction process and difficult to ensure connection quality in existing mechanical connection methods.

[0025] In this embodiment, the lower end of the cap beam steel bar 6 and the upper end of the base steel bar 4 are both threadedly connected with the first sleeve 8, and the quick-connect female head 10 at the lower end of the cap beam steel bar 6 and the quick-connect female head 10 at the upper end of the base steel bar 4 are both located inside the first sleeve 8; the upper and lower ends of the pier column steel bar 5 are both screwed with the second sleeve 7, and the quick-connect male heads 9 at the upper and lower ends of the pier column steel bar 5 are both threadedly connected with the second sleeve 7.

[0026] In this embodiment, the first sleeve 8 has one end facing the pier steel bar 5 internally threadedly connected with a threaded support sleeve 11 for limiting the quick-connect female head 10, and the middle portion of the threaded support sleeve 11 facilitates the quick-connect male head 9 to penetrate vertically.

[0027] Furthermore, the outer diameter of the first sleeve 8 is larger than the outer diameter of the second sleeve 7, and the cross-sectional dimensions of the pedestal 1 and the cap beam 3 are larger than the cross-sectional dimensions of the pier 2. In order to facilitate the thickness of the concrete protective layer at the embedded steel bar connector to meet the durability requirements, the first sleeve 8 with a larger outer wall diameter is arranged in the pedestal 1 and the cap beam 3 with a solid section, and the second sleeve 7 with a smaller outer wall diameter is arranged in the pier 2 with a hollow section.

[0028] In this embodiment, the structure of the steel bar connector includes a quick-connect male head 9, a quick-connect female head 10, a first sleeve 8 and a second sleeve 7, wherein the quick-connect male head 9 is a pin structure, and an annular groove is provided on the outer peripheral side of one end thereof, and the quick-connect female head 10 has a steel ball that can be embedded in the annular groove. The structure of the steel bar connector is the same as the PHC pipe pile non-welding quick-connect method and the anti-pullout quick-install structure disclosed in Chinese Patent Publication No. CN106013090B, that is: in this embodiment, the anti-pullout quick-install structure in the disclosed patent is directly used as the steel bar connector, and the first sleeve and the second sleeve here are the steel bar head cover in the disclosed patent, and the quick-connect female head and the quick-connect male head constitute the quick connector of the disclosed patent, so the specific structure and working principle of the steel bar connector in this embodiment will not be repeated here.

[0029] Combination Figure 3 and Figure 4 In this embodiment, the concrete hollow pier column 2 is an integrally prefabricated rectangular hollow cross-section reinforced concrete bridge pier, the wall thickness in the transverse direction of the bridge is larger, and the wall thickness in the longitudinal direction of the bridge is smaller. Variable cross-section sections are arranged at the pier top and the pier bottom. In order to reduce the deadweight of the pier column, the hollow size of the middle cross-section of the pier body is larger. In order to increase the cross-sectional stiffness, the hollow sizes of the pier top cross-section and the pier bottom cross-section are smaller, that is, the hollow size of the pier top cross-section and the hollow size of the pier bottom cross-section of the concrete hollow pier column are both smaller than the hollow size of the middle cross-section of the pier body.

[0030] In this embodiment, joints are formed between the top surface of the pedestal 1 and the bottom surface of each concrete hollow pier 2, and between the bottom surface of the cap beam 3 and the top surface of each concrete hollow pier 2, and the joints are filled with high-strength mortar, and an adjustment component for adjusting the joint height is arranged in the joint. Preferably, the adjustment component includes four adjustment screws 12 distributed in a rectangular shape, and the adjustment screws 12 are arranged vertically, that is, a total of eight adjustment screws are arranged on the pedestal 1, and a total of eight adjustment screws are arranged on the cap beam 3.

[0031] In this embodiment, in the adjustment component located in the joint between the top surface of the pedestal 1 and the bottom surface of the concrete hollow pier 2, one end of the adjustment screw 12 is threadedly connected to the top surface of the pedestal 1, and the other end of the adjustment screw 12 is abutted against the bottom surface of the concrete hollow pier 2. The position of the adjustment screw is closer to the center of the joint surface than the pedestal steel bar 4 and the first sleeve.

[0032] In this embodiment, in the adjustment component located in the joint between the bottom surface of the cap beam 3 and the top surface of the concrete hollow pier 2, one end of the adjustment screw 12 is threadedly connected to the bottom surface of the cap beam 3, and the other end of the adjustment screw 12 is abutted against the top surface of the concrete hollow pier 2. The position of the adjustment screw is closer to the center of the joint surface than the cap beam steel bar 4 and the first sleeve.

[0033] In this embodiment, a gap of 30 mm in height is reserved in the joint between the bottom surface of the concrete hollow pier column 2 and the top surface of the pedestal 1, and in the joint between the top surface of the concrete hollow pier column 2 and the bottom surface of the cap beam 3, so as to install and use the adjusting screw 14 to adjust the verticality of the concrete hollow pier column 2 and the cap beam 3; the bottom surface of the concrete hollow pier column 2 abuts against the top surface of the adjusting screw arranged at the top of the pedestal 1; the top surface of the concrete hollow pier column 2 abuts against the bottom surface of the adjusting screw arranged at the bottom of the cap beam 3, and the adjusting screw 14 is rotated to a height of 30 mm between it and the top surface of the pedestal 1 or the bottom surface of the cap beam 3, thereby controlling the height between the top surface of the pedestal 1 and the bottom surface of the concrete hollow pier column 2, and between the top surface of the concrete hollow pier column 2 and the bottom surface of the cap beam 3. After completing the connection between the pedestal 1 and the concrete hollow pier 2, the concrete hollow pier 2 is made perpendicular to the pedestal 1 by adjusting the top surface heights of the four adjusting screws respectively; after completing the connection between the concrete hollow pier 2 and the cap beam 3, the cap beam 3 is made perpendicular to the concrete hollow pier 2 by adjusting the top surface heights of the four adjusting screws respectively; after completing the verticality adjustment, high-strength mortar is used to fill the joints between the bottom surface of the concrete hollow pier 2 and the top surface of the pedestal 1 and the joints between the top surface of the concrete hollow pier 2 and the bottom surface of the cap beam 3.

[0034] In this embodiment, the pier column reinforcement 5 is evenly arranged on the cross-sectional periphery of the concrete hollow pier column 2, and four pier column reinforcements 5 are evenly arranged on each side of the cross-sectional area of ​​the concrete hollow pier column 2, and the horizontal spacing of the pier column reinforcements 5 is equal; a plurality of pier column reinforcements 4 are arranged on the cap 1 at positions corresponding to each of the concrete hollow pier columns 2, and the positions of the plurality of pier column reinforcements 4 and the pier column reinforcements 5 correspond one to one; a plurality of cap beam reinforcements 6 are arranged on the cap beam 3 at positions corresponding to each of the concrete hollow pier columns 2, and the positions of the plurality of cap beam reinforcements 6 and the pier column reinforcements 5 correspond one to one. That is, the positions of the pier column reinforcements, cap beam reinforcements, and cap beam reinforcements correspond one to one, and are connected by reinforcement connectors.

[0035] In this embodiment, the cap 1 and the cap beam 3 are both solid sections, and the cap 1, the concrete hollow pier 2 and the cap beam 3 are all prefabricated in the factory.

[0036] In this embodiment, Figure 7 As shown, the construction process of the prefabricated assembled concrete hollow pier with the locking sleeve threaded connection solves the problems of the existing mechanical connection method, such as the difficulty of the construction process and the difficulty in ensuring the connection quality, and includes the following steps: Step S1: Install the first sleeve 8 on the upper end of the cap steel bar 4 of the cap 1 and the lower end of the cap steel bar 6 of the cap beam 3, and then install the quick-connect female head 10 and the threaded support sleeve 13 in the first sleeve 8; Step S2: Install the second sleeve 7 on the upper and lower ends of the pier column reinforcement 5, and then install the quick-connect male connector 9 on the second sleeve 7; Step S3: Install the adjusting screw 12 on the top of the platform 1 and the bottom of the cap beam 3; Step S4: hoist the concrete hollow pier column 2 to the top surface of the cap 1, and then insert the quick-connect male head 9 of the concrete hollow pier column 2 into the quick-connect female head in the first sleeve 8 of the cap 1; Step S5: Screw the adjusting screw of the cap 1 until the concrete hollow pier 2 is perpendicular to the cap 1, and then tighten the quick-connect male head 9 and the second sleeve 7; Step S6: hoist the cap beam 3 to the top surface of the concrete hollow pier 2, and then insert the quick-connect male connector 9 of the concrete hollow pier 2 into the quick-connect female connector 10 in the first sleeve 8 of the cap beam 3; Step S7: Screw the adjusting screw 14 of the cap beam 3 until the cap beam 3 is perpendicular to the concrete hollow pier 2, and then tighten the quick-connect male head 9 and the second sleeve 7; Step S8: Sealing grouting of the joints: supporting formwork around the joints between the hollow concrete pier column 2 and the cap 1, and between the hollow concrete pier column 2 and the cap beam 3, and filling the joints with mortar.

[0037] In the above step S1, after the quick-connect female connector 10 is installed, anti-rust grease is injected into the first sleeve 8 to improve the durability of the quick-connect female connector.

[0038] In this construction process, the key to the construction of prefabricated piers is the connection between the cap 1 and the hollow concrete pier column 2, and between the hollow concrete pier column 2 and the cap beam 3, which is specifically manifested in the connection between the pier column reinforcement and the reinforcement of the cap 1 and the cap beam 3. When the grouting sleeve connection method is adopted, the reinforcement of the cap 1, the pier column 2, and the cap beam 3 is respectively inserted into the sleeve and the grouting material is poured into the sleeve. The construction process of the grouting sleeve connection is complicated, and the requirements for the precision of the reinforcement docking are high. The grouting fullness cannot be detected, and the grouting material needs a certain curing time to reach the specified strength. When the traditional mechanical connection method is adopted, the reinforcement on one side is first connected to the threaded sleeve. After the pier column 2 and the cap beam 3 are hoisted into place, the reinforcement on the other side is then connected to the threaded sleeve by rotation. The extrusion, cone sleeve, and double screw sleeve joints meet the requirement that the reinforcement does not rotate, but the fault tolerance is limited. The scope of use of the traditional mechanical connection is limited, and a long section of reinforcement needs to be reserved for manual deviation correction and post-poured concrete.

[0039] Therefore, in order to reduce the construction difficulty, shorten the construction period and improve the quality assurance, the exposed pedestal steel bars on the top of the pedestal 1 are threaded and connected to the first sleeve, the exposed pier steel bars on the top and bottom of the concrete hollow pier 2 are threaded and connected to the second sleeve, the end of the quick-connect male head is threaded and connected to the second sleeve, and the exposed cap beam steel bars on the bottom of the cap beam 3 are threaded and connected to the first sleeve, thereby avoiding the need to rotate the steel bars when installing the mechanical connection sleeve; placing the quick-connect female head in the first sleeve before assembly; after the pier 2 is lifted into place, the quick-connect male head is inserted into the quick-connect female head of the first sleeve pre-embedded in the pedestal 1, and the assembly of the pedestal 1 and the pier 2 is completed; after the cap beam 3 is lifted into place, the quick-connect male head is inserted into the quick-connect female head of the first sleeve pre-embedded in the cap beam 3, and the assembly of the pier 2 and the cap beam 3 is completed, thereby avoiding the need to grout into the sleeve and the difficulty in ensuring the quality of the grouting.

[0040] In order to ensure that the steel bar connection between the pedestal 1 and the concrete hollow pier 2, and between the concrete hollow pier 2 and the cap beam 3 has a high precision, in this embodiment, when the pedestal 1, the concrete hollow pier 2 and the cap beam 3 are prefabricated, a steel formwork is used to position the first sleeve and the second sleeve connected to the steel bar; in the steel bar binding stage, the steel formwork at the top of the pedestal 1 and the bottom of the cap beam 3 is reserved for fixing the first sleeve, and the steel formwork at the bottom and top of the concrete hollow pier 2 is reserved for fixing the second sleeve, and the first sleeve and the second sleeve are fixed to the steel formwork respectively by bolts; in the concrete pouring stage, the steel formwork plays a fixing role to avoid changes in the position of the cap beam steel bar (and the pedestal steel bar) connected to the first sleeve and the pier steel bar connected to the second sleeve when vibrating the concrete, thereby ensuring that the quick-connect male head on the second sleeve can be accurately inserted into the quick-connect female head in the first sleeve when the pedestal 1 and the concrete hollow pier 2, and the concrete hollow pier 2 and the cap beam 3 are assembled.

[0041] After hoisting, the concrete hollow pier 2 and cap beam 3 need to be adjusted for verticality by adjusting screws. Since the concrete hollow pier is a hollow section, and the pedestal and cap beam are solid sections, there is a large space for the adjustment screws to be placed in the sections of the pedestal 1 and the cap beam 3. Therefore, the adjustment screws are installed at the top of the pedestal 1 and the bottom of the cap beam 3. In this embodiment, a total of four holes for installing the adjustment screws are reserved at the four corners of the steel formwork at the top of the pedestal 1 and the bottom of the cap beam 3, and the hole position of the adjustment screw is closer to the center of the steel formwork than the hole position of the first sleeve. The adjustment screws are installed in the reserved holes at the top of the pedestal 1 and the bottom of the cap beam 3 before assembly. In order to reduce the workload of adjusting the verticality of the pier 2 and the cap beam 3 after assembly, after the four adjustment screws are installed, the four top surfaces of the adjustment screws are adjusted to the same horizontal plane.

[0042] In order to ensure the construction quality of the prefabricated assembled piers, it is necessary to calibrate the verticality of the concrete hollow pier column 2 and the cap beam 3. In this embodiment, four adjusting screws are used to adjust the verticality of each connection surface, and a laser level is used to calibrate the verticality. After the quick-connect male head of the concrete hollow pier column 2 is inserted into the first sleeve of the pedestal 1, a laser level is placed in two directions parallel to the vertical side of the concrete hollow pier column 2, and the heights of the four adjusting screws installed on the pedestal 1 are adjusted in turn until the laser lines in the two directions are consistent with the vertical side of the concrete hollow pier column 2. After the quick-connect male head of the concrete hollow pier column 2 is inserted into the first sleeve of the cap beam 3, a laser level is placed in two directions parallel to the vertical side of the cap beam 3, and the heights of the four adjusting screws installed on the cap beam 3 are adjusted in turn until the laser lines in the two directions are consistent with the vertical side of the cap beam 3.

[0043] After the hoisting is completed, the bottom surface of the concrete hollow pier 2 abuts against the top surface of the adjusting screw provided at the top of the pedestal 1, and the top surface of the concrete hollow pier 2 abuts against the top surface of the adjusting screw provided at the bottom of the cap beam 3. A wrench is needed to rotate the adjusting screw to adjust the verticality of the concrete hollow pier 2 and the cap beam 3. After the adjustment is completed, a wrench is needed to tighten the quick-connect male head. Therefore, in order to have enough operating space when using the wrench, in one embodiment, in step S3, the top surface of the adjusting screw is rotated to a height of 30 mm between it and the top surface of the pedestal 1 or the bottom surface of the cap beam 3, so that there is a space of sufficient height between the top surface of the pedestal 1 and the bottom surface of the concrete hollow pier 2, and between the top surface of the concrete hollow pier 2 and the bottom surface of the cap beam 3 for the operation of the wrench.

[0044] After the assembly is completed, it is necessary to seal the joints between the pedestal 1 and the hollow concrete pier 2, and between the hollow concrete pier 2 and the cap beam 3 by grouting. Therefore, in order to make the grouting layer full and dense, in one embodiment, in step S8, a wooden formwork is used to seal the joints on all sides, and the bottom of the wooden formwork is sealed with foam glue to prevent slurry from overflowing. A gap is reserved between the top of the wooden formwork at the joint between the pedestal 1 and the hollow concrete pier 2 and the outer wall of the hollow concrete pier 2, and a gap is reserved between the top of the wooden formwork at the joint between the hollow concrete pier 2 and the cap beam 3 and the outer wall of the cap beam 3. A coarse gap with a width of 10 mm is reserved on one side of the joint, and a fine gap with a width of 1 mm is reserved on the other three sides. The coarse gap is used for grouting, and the fine gap is used for ventilation. When the slurry overflows from the fine gap, the grouting is completed.

[0045] In the present invention, the connection node structure design between the abutment, pier column and cap beam is simple, the structural force is clear, and the bridge pier can be guaranteed to have sufficient strength, rigidity and energy dissipation capacity; the steel bar connector directly adopts the pull-out quick-install structure disclosed in the existing patent, which is convenient for construction and avoids the disadvantages of the commonly used grouting sleeve connection, such as high construction precision requirements, difficult grouting quality detection, and extended construction period caused by grouting material solidification; the connection between the steel bars is completed by plugging and matching the quick-connect male head and the quick-connect female head, which avoids the situation that the conventional mechanical threaded joint requires the steel bar to rotate or move, and solves the problem that the existing mechanical connection method has a difficult construction process and difficult to ensure the connection quality. Therefore, the structural design is simple, the structural force is clear, and the pier column can be guaranteed to have sufficient bearing capacity, rigidity and energy dissipation capacity, and it has the characteristics of convenient construction and reliable quality.

[0046] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0047] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the present invention include states or shapes that are approximate, similar, or close to them.

[0048] Any component provided by the present invention may be assembled from a plurality of separate components, or may be a separate component manufactured by an integral forming process.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A prefabricated assembled concrete hollow pier with a locking sleeve threaded connection, comprising a steel bar connector, wherein the steel bar connector comprises a quick-connect male head and a quick-connect female head that are plug-fitted, and is characterized in that: It also includes a cap, a concrete hollow pier and a cap beam which are arranged in sequence from bottom to top, wherein the interior of the concrete hollow pier is provided with pier column steel bars, the upper and lower ends of the pier column steel bars respectively extend out of the concrete hollow pier, and the upper and lower ends of the pier column steel bars are both provided with quick-connect male heads; the interior of the cap is provided with cap steel bars extending upward, and the interior of the cap beam is provided with cap beam steel bars extending downward, and the upper end of the cap steel bars and the lower end of the cap beam steel bars are both provided with quick-connect female heads for plugging and cooperating with the quick-connect male heads.

2. The prefabricated assembled concrete hollow pier with locking sleeve threaded connection according to claim 1, characterized in that: The lower end of the cap beam steel bar and the upper end of the pedestal steel bar are both threadedly connected with the first sleeve, and the quick-connect female head at the lower end of the cap beam steel bar and the quick-connect female head at the upper end of the pedestal steel bar are both located inside the first sleeve; the upper and lower ends of the pier column steel bar are both threadedly connected with the second sleeve, and the quick-connect male heads at the upper and lower ends of the pier column steel bar are both threadedly connected with the second sleeve.

3. The prefabricated assembled concrete hollow pier with locking sleeve threaded connection according to claim 2, characterized in that: The end of the first sleeve facing the pier column reinforcement is internally threadedly connected with a threaded support sleeve for limiting the quick-connect female head, and the middle part of the threaded support sleeve is convenient for the quick-connect male head to penetrate vertically.

4. The prefabricated assembled concrete hollow pier with locking sleeve threaded connection according to claim 1, characterized in that: The concrete hollow pier column is provided with variable cross-section sections at the pier top and the pier bottom; the hollow size of the pier top section and the hollow size of the pier bottom section of the concrete hollow pier column are both smaller than the hollow size of the middle section of the pier body.

5. The prefabricated assembled concrete hollow pier with locking sleeve threaded connection according to claim 1, characterized in that: There are two concrete hollow piers, and joints are formed between the top surface of the pedestal and the bottom surface of each concrete hollow pier, and between the bottom surface of the cap beam and the top surface of each concrete hollow pier. The joints are filled with mortar, and an adjustment component for adjusting the joint height is arranged in the joint.

6. The prefabricated assembled concrete hollow pier with locking sleeve threaded connection according to claim 5, characterized in that: The adjustment component includes four adjustment screws distributed in a rectangular shape; in the adjustment component located in the joint between the top surface of the pedestal and the bottom surface of the concrete hollow pier column, one end of the adjustment screw is threadedly connected to the top surface of the pedestal, and the other end of the adjustment screw is abutted against the bottom surface of the concrete hollow pier column; in the adjustment component located in the joint between the bottom surface of the cap beam and the top surface of the concrete hollow pier column, one end of the adjustment screw is threadedly connected to the bottom surface of the cap beam, and the other end of the adjustment screw is abutted against the top surface of the concrete hollow pier column.

7. The prefabricated assembled concrete hollow pier with locking sleeve threaded connection according to claim 5, characterized in that: The pier column steel bars are evenly arranged on the periphery of the cross section of the concrete hollow pier column, and four pier column steel bars are evenly arranged on each side of the cross section of the concrete hollow pier column; a plurality of pedestal steel bars are arranged on the pedestal at positions corresponding to the positions of each concrete hollow pier column, and the positions of the plurality of pedestal steel bars correspond one to one with the pier column steel bars; a plurality of cap beam steel bars are arranged on the cap beam at positions corresponding to the positions of each concrete hollow pier column, and the positions of the plurality of cap beam steel bars correspond one to one with the pier column steel bars.

8. The prefabricated assembled concrete hollow pier with locking sleeve threaded connection according to claim 1, characterized in that: The pedestal and cap beam are both solid sections, and the pedestal, concrete hollow piers and cap beam are all prefabricated in the factory.

9. A construction process for prefabricated assembled concrete hollow piers with locking sleeve type threaded connections as claimed in any one of claims 1 to 8, characterized in that: The steps include: Step S1: Install the first sleeve on the upper end of the cap steel bar of the cap and the lower end of the cap steel bar of the cap beam, and then install the quick-connect female head and the threaded support sleeve in the first sleeve; Step S2: Install the second sleeve on the upper and lower ends of the pier column reinforcement, and then install the quick-connect male connector on the second sleeve; Step S3: Install the adjusting screws on the top of the pedestal and the bottom of the cap beam; Step S4: hoisting the concrete hollow pier column to the top surface of the cap, and then inserting the quick-connect male head of the concrete hollow pier column into the quick-connect female head in the first sleeve of the cap 1; Step S5: Screw the adjusting screw of the cap until the hollow concrete pier is perpendicular to the cap, and then tighten the quick-connect male head and the second sleeve; Step S6: hoisting the cap beam to the top surface of the concrete hollow pier column, and then inserting the quick-connect male head of the concrete hollow pier column into the quick-connect female head in the first sleeve of the cap beam; Step S7: Screw the adjusting screw of the cap beam until the cap beam is perpendicular to the concrete hollow pier column, and then tighten the quick-connect male head and the second sleeve; Step S8: Sealing grouting of the joints: supporting formwork around the joints between the hollow concrete pier column and the cap, and between the hollow concrete pier column and the cap beam, and filling the joints with mortar.

10. The construction process of a prefabricated assembled concrete hollow pier with a locking sleeve type threaded connection according to claim 9, characterized in that: In step S1, after the quick-connect female head and the threaded support sleeve are installed, anti-rust grease is injected into the quick-connect female head; in step S3, the height between the top surface of the screw and the connection surface is adjusted to 30 mm; in step S8, the bottom of the template is sealed with foam glue, and a grouting port and a vent are reserved on the top.

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