Assembly type small hinge joint fragmented bent cap-bridge pier connecting structure and construction method of assembly type small hinge joint fragmented bent cap-bridge pier connecting structure

Abstract

The invention discloses an assembly type small hinge joint fragmented cover beam-bridge pier connecting structure and a construction method, the assembly type small hinge joint fragmented cover beam-bridge pier connecting structure comprises at least two prefabricated pier columns, a prefabricated cover beam and a connecting layer, a cavity is formed in the middle of each prefabricated pier column, and the top of each prefabricated pier column is connected with the corresponding prefabricated cover beam through a pier column cast-in-place section; a plurality of ordinary steel bars extending upwards and first positioning steel bars are embedded in the periphery of the interior of the prefabricated pier column. The prefabricated cover beam is composed of a first cover beam and a second cover beam, a cover beam cast-in-place seam is arranged between the first cover beam and the second cover beam, common connecting steel bars are pre-buried in the connecting area and connected with prefabricated pier column common steel bars through grouting sleeves, mounting grooves are formed in the tops of the positioning hole channels, and positioning assemblies are fixedly mounted in the positioning hole channels and the mounting grooves. The prefabricated bent cap is prefabricated in a split mode, the overall hoisting weight of the bent cap is reduced, the hoisting process is safer and more convenient, cast-in-place and prefabrication are combined, multiple steel bar connection and positioning assemblies are adopted, the overall stability of the structure is enhanced, high-precision rapid installation is achieved, and the connection reliability of the assembly type structure is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of prefabricated bridge technology, and more specifically, relates to a connection structure and construction method of prefabricated small hinge joint segmented cap beam-pier. Background Technology

[0002] In bridge construction, the connection between the cap beam and the pier is a crucial element in ensuring the stability and safety of the bridge structure. Traditional bridge substructure construction often employs on-site concrete pouring, involving erecting formwork, tying reinforcing bars, and pouring concrete on-site. This construction process has several limitations: firstly, the on-site operation is cumbersome, requiring significant manpower and resources for formwork support system construction, reinforcing bar processing and installation, resulting in low construction efficiency and extended construction periods; secondly, construction quality is greatly affected by weather, environmental factors, and the skill level of construction workers, making precise control difficult and prone to quality problems such as concrete cracking and insufficient strength. Furthermore, extensive on-site work generates noise and dust pollution, negatively impacting the surrounding environment.

[0003] In modern bridge engineering infrastructure construction, the use of precast components is becoming increasingly widespread. Precast components not only improve construction efficiency but also effectively reduce on-site wet work, lowering construction costs and environmental pollution. However, the connection between precast components has always been a critical issue in construction. Traditional connection methods, such as welding, binding, or cast-in-place concrete, have many shortcomings, including low construction efficiency, insufficient connection strength, poor durability, and high requirements for the construction environment. Especially in the connection between precast piers and precast cap beams, traditional methods often require extensive on-site welding or concrete pouring, which not only increases construction difficulty and cost but may also lead to unstable construction quality. Furthermore, traditional connection methods have poor environmental adaptability during construction, making it difficult to achieve rapid and accurate installation under complex conditions. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a prefabricated small-hinged segmented cap beam-pier connection structure and construction method. By manufacturing prefabricated piers and cap beams in a factory, the construction cycle is significantly shortened, the on-site work is reduced, and construction safety risks are lowered. By using segmented prefabrication for the cap beams, the overall weight of the cap beams during hoisting is reduced, making the hoisting process safer and more convenient. It also significantly reduces the requirements for lifting equipment, further expanding the flexibility and applicability of construction. The positioning components use mechanical connecting sleeves and threaded connections of positioning steel bars, along with positioning nuts and steel pads for fixation, achieving precise docking between the prefabricated piers and cap beams. During installation, the positioning nuts are initially tightened to reduce the alignment error between the prefabricated cap beams and prefabricated piers, saving installation time and significantly reducing high-altitude work time and safety risks.

[0005] To achieve the above objectives, according to one aspect of the present invention, a prefabricated small-hinged segmented cap beam-pier connection structure is provided, comprising at least two precast piers, a precast cap beam, and an interface layer. The precast piers are fixedly installed on the top of the pier cap, and the interface layer is provided on the top of the interface layer. The precast cap beam is provided on the top of the interface layer. The precast pier has a cavity in the middle and a cast-in-place section at the top. The cast-in-place concrete is used to achieve a tight connection with the precast cap beam, which enhances the overall stability of the structure. Multiple upward-extending ordinary steel bars and first positioning steel bars are pre-embedded around the inside of the precast pier. The precast cap beam includes a first segment cap beam and a second segment cap beam, with a cast-in-place joint between them. Multiple ordinary connecting steel bars are pre-embedded in the connection area between the first and second segment cap beams and the precast pier column. A grouting sleeve is fixedly installed at the bottom of the multiple ordinary connecting steel bars, and the grouting sleeve is sleeved on the outside of the ordinary steel bars. Multiple positioning channels penetrating the first and second segment cap beams are provided in the connection area between the first and second segment cap beams and the precast pier column. An installation groove is provided at the top of the positioning channel. Positioning components are fixedly installed in the positioning channel and the installation groove. The first and second segment cap beams are positioned and installed on the top of the precast pier column by the positioning components.

[0006] Furthermore, the top of the first positioning steel bar is provided with external threads.

[0007] Furthermore, the upper end of the ordinary connecting steel bar is provided with a 90-degree hook, and the 90-degree hook faces the outside of the precast cap beam.

[0008] Furthermore, the positioning assembly includes a mechanical connecting sleeve, a second positioning reinforcing bar, a positioning nut, and a steel pad. The lower end of the mechanical connecting sleeve is threadedly connected to the positioning reinforcing bar embedded in the precast pier column, and the other end is threadedly connected to the lower end of the second positioning reinforcing bar. A steel pad is provided at the bottom of the mounting groove. The upper end of the second positioning reinforcing bar passes through the positioning hole, extends into the mounting groove, and passes through the steel pad. The second positioning reinforcing bar is fixed in the mounting groove by the positioning nut.

[0009] Furthermore, the bottom of the positioning channel is provided with a grouting pipe, one end of which is connected to the positioning channel and the other end extends out of the top of the precast cap beam; the top of the positioning channel is provided with a grout outlet pipe, one end of which is connected to the positioning channel and the other end extends out of the top of the precast cap beam.

[0010] Furthermore, a grout inlet pipe is fixedly installed at the bottom of the grouting sleeve, one end of which is connected to the grouting sleeve and the other end extends out of the precast cap beam; a grout outlet pipe is fixedly installed at the top of the grouting sleeve, one end of which is connected to the grouting sleeve and the other end extends out of the precast cap beam.

[0011] Furthermore, the grouting sleeve can be a full grouting sleeve or a half grouting sleeve, depending on the actual needs of the project.

[0012] According to a second aspect of the present invention, a construction method for a prefabricated small hinge joint segmented cap beam-pier connection structure is provided, which is implemented using the aforementioned prefabricated small hinge joint segmented cap beam-pier connection structure, and includes the following steps: S100: Based on the design drawings, erect the formwork for the precast pier column, accurately position the ordinary steel bars and the first positioning steel bars, and after completing the steel bar positioning process, pour concrete and carry out curing operations in accordance with the curing specifications to ensure that the strength of the precast pier column meets the design requirements. S200: According to the design scheme, the precast cap beams are prefabricated in sections. The first section cap beam and the second section cap beam are made separately. The template structures for the first section cap beam and the second section cap beam are built separately. The positioning and installation of the grouting sleeve, ordinary connecting steel bars and positioning channels are completed in sequence. Then, concrete is poured and cured to make each section cap beam reach the predetermined design strength standard. S300: Rubber pads are installed on both sides of the top of each precast pier. The first segment cap beam is lifted and installed to the predetermined position using hoisting equipment. The grouting sleeve and positioning channel reserved in the first segment cap beam are precisely aligned with the ordinary steel bars and the first positioning steel bars embedded in the precast pier. After cleaning the interface between the upper and lower components, the first segment cap beam is placed on the rubber pads. The positioning component is used to achieve temporary connection and fixation between the first segment cap beam and the precast pier. S400: Verify the elevation of the top of the cap beam. After confirming that it is correct, tighten the positioning nut at the second positioning steel bar. At the same time, perform grouting filling operation on the grouting sleeve and positioning channel. S500: Repeat steps S300 to S400 to complete the hoisting operation of the second segment cap beam. After the second segment cap beam is installed, tie the connecting steel bars between the first and second segment cap beams, and fix the upper ends of the ordinary connecting steel bars with the ordinary steel bars by mechanical connecting sleeves. Install grouting side formwork around the top of the precast pier column. Pour concrete into the pier column cast-in-place section and the junction layer through the cap beam cast-in-place joint, and finally pour the cap beam cast-in-place joint.

[0013] Furthermore, the thickness of the rubber pad is determined based on the theoretical thickness of the junction layer and the actual measured elevation deviation, in order to eliminate the elevation deviation, and the top surface of the rubber pad should be in close contact with the bottom of the beam.

[0014] Furthermore, after the cast-in-place joint of the cap beam is poured, the installation groove is filled with concrete and smoothed.

[0015] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. The prefabricated small-hinged segmented cap beam-pier connection structure of the present invention utilizes factory production of precast piers and cap beams. The production process is not limited by natural conditions such as weather at the construction site, resulting in high production efficiency and strict quality control. This ensures that the strength, durability, and other performance indicators of the precast components meet high standards. On-site work mainly involves installation, which is relatively simple and does not require the complex procedures of building numerous formworks and tying reinforcing bars as in on-site casting, significantly shortening the construction cycle. Simultaneously, the amount of work on-site is reduced, lowering construction safety risks and minimizing dust and noise pollution, making it more environmentally friendly.

[0016] 2. The prefabricated small hinge segmented cap beam-pier connection structure of the present invention uses a mechanical connecting sleeve and a threaded connection of positioning steel bars for the positioning component, which is fixed with a positioning nut and a steel pad. This can achieve precise docking between the prefabricated pier and the prefabricated cap beam. During installation, the positioning nut is tightened to initially fix the structure, reducing the alignment error between the prefabricated cap beam and the prefabricated pier axis, saving installation time, and significantly reducing the time and safety risks of working at height.

[0017] 3. The prefabricated small hinge joint segmented cap beam-pier connection structure of the present invention reduces the weight of the overall cap beam hoisting by adopting segmented prefabrication of the prefabricated cap beam, making the hoisting process safer and more convenient, and significantly reducing the requirements for lifting equipment, further expanding the flexibility and applicability of construction.

[0018] 4. The prefabricated small hinge joint segmented cap beam-pier connection structure of the present invention, by utilizing positioning components and rubber pads for elevation adjustment, can ensure precise alignment and tight fit between the precast pier and the cap beam, enhancing the stability and reliability of the connection, effectively avoiding structural hazards caused by elevation deviations. In addition, the elevation adjustment of the rubber pads is adjusted according to the theoretical joint surface thickness and actual measurement deviations, which can accurately eliminate elevation deviations, ensure the accuracy of the cap beam top elevation, and further improve the overall quality of the structure. The use of positioning components and the grouting operation of grouting sleeves and positioning channels ensure the compactness and strength of the connection, significantly improving construction accuracy and reducing construction errors. Attached Figure Description

[0019] Figure 1 This is an elevation view of a prefabricated small hinge joint segmented cap beam-pier connection structure according to an embodiment of the present invention; Figure 2 This is a side view of a prefabricated small hinge joint segmented cap beam-pier connection structure according to an embodiment of the present invention; Figure 3 This is a connection structure elevation view of a prefabricated small hinge joint segmented cap beam-pier connection structure according to an embodiment of the present invention; Figure 4 This is a side view of the connection structure of a prefabricated small hinge joint segmented cap beam-pier according to an embodiment of the present invention; Figure 5 This is a cross-sectional layout diagram of the pier connection point along the bridge direction in an embodiment of the present invention, showing the connection structure of a prefabricated small hinge joint segmented cap beam-pier. Figure 6 This is a cross-sectional layout diagram of the joint at the connection between the prefabricated small hinge joint segmented cap beam and the pier, according to an embodiment of the present invention. Figure 7 This is a general layout diagram of the cross-section at the pier connection of a prefabricated small hinge joint segmented cap beam-pier connection structure according to an embodiment of the present invention. Figure 8 This is a cross-sectional view of the positioning reinforcement at the transverse pier connection of a prefabricated small hinge joint segmented cap beam-pier connection structure according to an embodiment of the present invention. Figure 9 for Figure 8 A magnified view of part A; Figure 10 This is a schematic flowchart illustrating the construction method of a prefabricated small hinge joint segmented cap beam-pier connection structure according to an embodiment of the present invention.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-precast pier column, 11-cast-in-place section of pier column, 12-ordinary reinforcing steel bar, 13-first positioning reinforcing steel bar, 2-precast cap beam, 21-first segmented cap beam, 22-second segmented cap beam, 23-cast-in-place joint of cap beam, 24-grouting sleeve, 241-grout inlet pipe, 242-grout outlet pipe, 25-ordinary connecting reinforcing steel bar, 26-positioning duct, 261-grouting pipe of duct, 262-grout outlet pipe of duct, 27-installation groove, 28-positioning component, 281-mechanical connecting sleeve, 282-second positioning reinforcing steel bar, 283-positioning nut, 284-steel pad, 3-intersection layer, 4-grouting side formwork. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] In this patent, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0025] Example 1 like Figure 1-9 As shown, this embodiment of the invention provides a prefabricated small-hinged segmented cap beam-pier connection structure, including at least two precast pier columns 1, a precast cap beam 2, and an interface layer 3. The precast pier columns 1 are fixedly installed on the top of the pier cap, and the interface layer 3 is provided on the top of the pier column. The precast cap beam 2 is provided on the top of the interface layer 3. The precast cap beam and the precast pier column are connected through the interface layer 3 to form a structural system with good overall performance. Furthermore, the precast components are produced in a factory, and the production process is not limited by natural conditions such as weather at the construction site. This results in high production efficiency and strict quality control, ensuring that the strength, durability, and other performance indicators of the precast components meet high standards. On-site installation is mainly carried out, and the installation process is relatively simple, eliminating the need for complex procedures such as building a large number of formwork and tying reinforcing bars as required by on-site casting, thus greatly shortening the construction cycle. At the same time, the amount of work on the construction site is relatively reduced, lowering construction safety risks and reducing pollution such as dust and noise, making it more environmentally friendly. In addition, the production and installation process of precast components can be modularly managed, facilitating the control of construction progress and quality.

[0026] Furthermore, the precast pier 1 has a cavity in the middle, which effectively reduces the pier's self-weight while ensuring its load-bearing capacity, reducing transportation and hoisting difficulties, and improving construction convenience. The top of the precast pier 1 has a cast-in-place section 11, which achieves a tight connection with the precast cap beam through cast-in-place concrete, enhancing the overall structural stability. Multiple ordinary steel bars 12 are pre-embedded at intervals around the inside of the precast pier 1. These ordinary steel bars 12 extend upwards and connect with the steel bars of the superstructure to form an integral steel frame, thereby better transferring loads. They are mainly used to bear the tensile and shear forces of the structure, enhancing the tensile and shear strength of the pier. Multiple first positioning steel bars 13 are pre-embedded around the inside of the precast pier 1. These first positioning steel bars 13 extend upwards, ensuring accurate positioning of the precast pier 1 during installation and proper connection with the cap beam structure. Simultaneously, the first positioning steel bars 13 also play a role in bearing the tensile and shear forces of the structure.

[0027] Furthermore, the top of the first positioning steel bar 13 is provided with external threads to facilitate connection with the precast cap beam 2.

[0028] Furthermore, the precast cap beam 2 includes a first segmented cap beam 21 and a second segmented cap beam 22. A cap beam cast-in-place joint 23 is provided between the first segmented cap beam 21 and the second segmented cap beam 22. The cap beam cast-in-place joint 23 is filled with high-strength concrete. Through the reserved rough surface and steel bars, it is ensured that the two cap beams form a cohesive structure after casting, which effectively improves the load-bearing capacity and crack resistance of the cap beam.

[0029] Furthermore, multiple ordinary connecting steel bars 25 are pre-embedded in the connection area between the first segmented cap beam 21 and the second segmented cap beam 22 and the precast pier column 1. A grouting sleeve 24 is fixedly installed at the bottom of the multiple ordinary connecting steel bars 25. The grouting sleeve 24 is sleeved on the outside of the ordinary steel bar 12. The ordinary connecting steel bars 25 and the ordinary steel bar 12 are connected by the grouting sleeve 24, so that the precast pier column 1 and the precast cap beam 2 form a reliable connection system.

[0030] Specifically, during installation, the corresponding reinforcing bars extending from the precast pier column 1 are precisely inserted into the grouting sleeve 24, and then high-strength non-shrink grout is injected to tightly bond the reinforcing bars with the sleeve, thereby achieving a rigid connection between the precast cap beam 2 and the precast pier column 1 and ensuring the effective transmission of vertical loads and horizontal forces.

[0031] Furthermore, two lifting rings are pre-embedded on the top of the precast pier 1 for hoisting and installing the precast pier 1.

[0032] Furthermore, the upper end of the ordinary connecting steel bar 25 is provided with a 90-degree hook, which faces outward of the cap beam. This strengthens the anchorage between the ordinary connecting steel bar 25 and the concrete of the precast cap beam 2. When the structure is under load, the 90-degree hook effectively restricts the slippage of the steel bar, enhances the bond between the steel bar and the concrete, and thus improves the overall shear and tensile strength of the connection between the precast cap beam and the precast pier column. Simultaneously, the hook layout facing outward of the cap beam facilitates cross-anchoring with other steel bars during the construction of the cap beam's cast-in-place joint, further strengthening the stability of the connection node and ensuring reliable transmission of vertical loads and horizontal forces between the cap beam and the pier column.

[0033] Furthermore, a grout inlet pipe 241 is fixedly installed at the bottom of the grouting sleeve 24, with one end connected to the grouting sleeve 24 and the other end extending out of the precast cap beam 2; a grout outlet pipe 242 is fixedly installed at the top of the grouting sleeve 24, with one end connected to the grouting sleeve 24 and the other end extending out of the precast cap beam 2; by connecting the grout inlet pipe 241 and the grout outlet pipe 242 to the grouting sleeve 24, a complete and efficient grouting channel system is constructed. In actual construction, high-strength non-shrink grout is injected into the grouting sleeve 24 at a specific pressure through the grout inlet pipe 241. The grout fills the sleeve from bottom to top. As the grouting process progresses, the air and excess grout in the sleeve are discharged through the grout outlet pipe 242 at the top until the grout outlet pipe 242 flows out uniform and full grout. At this time, grouting is stopped and the grout outlet pipe 242 is sealed in time to ensure that the density of the grout in the sleeve reaches 100%.

[0034] Furthermore, the outlets of the transverse bridge inlet pipe 241 and outlet pipe 242 are extended to the outside of the longitudinal bridge precast cap beam, effectively avoiding the problem of cramped construction space caused by the traditional central opening, making the connection and operation of the grouting equipment more convenient.

[0035] Furthermore, the connection area between the first segmented cap beam 21 and the second segmented cap beam 22 and the precast pier column 1 is provided with multiple positioning channels 26 penetrating the first segmented cap beam 21 and the second segmented cap beam 22. The top of each positioning channel 26 is provided with an installation groove 27. Positioning components 28 are fixedly installed within the positioning channels 26 and the installation groove 27, positioning the first segmented cap beam 21 and the second segmented cap beam 22 on the top of the precast pier column using the positioning components 28. During hoisting, the positioning components 28 are first precisely aligned with the pre-embedded positioning steel bars 13 at the top of the precast pier column 1. The positioning steel bars are then inserted into the positioning channels 26, and the horizontal displacement of the cap beams is limited by the positioning components 28, achieving the positioning and installation of the first segmented cap beam 21 and the second segmented cap beam 22 on the top of the precast pier column. This ensures accurate installation of each component, laying the foundation for subsequent grouting connections and cast-in-place joint construction. The use of positioning components 28 significantly reduces high-altitude work time and lowers construction safety risks.

[0036] Furthermore, the positioning component 28 includes a mechanical connecting sleeve 281, a second positioning reinforcing bar 282, a positioning nut 283, and a steel pad 284. The lower end of the mechanical connecting sleeve 281 is threadedly connected to the positioning reinforcing bar 13 embedded in the precast pier column 1, and its other end is threadedly connected to the lower end of the second positioning reinforcing bar 282. A steel pad 284 is provided at the bottom of the mounting groove 27. The upper end of the second positioning reinforcing bar 282 passes through the positioning hole 26, extends into the mounting groove 27, and passes through the steel pad 284. The positioning nut 283 fixes the second positioning reinforcing bar 282 within the mounting groove 27. The mechanical connecting sleeve connects the embedded reinforcing bar in the precast pier column with the second positioning reinforcing bar, forming a stable positioning reference, effectively ensuring accurate alignment during the installation of the superstructure. After the second positioning reinforcing bar passes through the positioning hole of the cap beam, it is locked and fixed by the steel pad and positioning nut in the mounting groove, providing reliable temporary fixation for the cap beam after hoisting, preventing displacement or tilting, and ensuring construction safety. The entire assembly uses threaded connections and nut locking, resulting in a simple structure and convenient installation and disassembly, significantly improving on-site construction efficiency. Furthermore, the second positioning steel bar 282, positioning nut 283, and steel pad 284 enhance the connection stability between the precast pier column 1 and the precast cap beam 2.

[0037] Furthermore, the bottom of the positioning channel 26 is provided with a grouting pipe 261, one end of which is connected to the positioning channel 26 and the other end extends out of the top of the precast cap beam 2; the top of the positioning channel 26 is provided with a grout outlet pipe 262, one end of which is connected to the positioning channel 26 and the other end extends out of the top of the precast cap beam 2; the grouting pipe 261, the grout outlet pipe 262 and the positioning channel 26 work together to form a complete grouting system. Specifically, the grouting pipe 261 serves as the starting point for grout injection. Through external grouting equipment, high-strength non-shrink grout can be injected into the positioning channel 26 at a controllable pressure and uniform speed, ensuring that the grout can fully fill the gap between the second positioning steel bar 282 and the inner wall of the channel; the grout outlet pipe 262 at the top serves as a key channel for observation and venting. When the grout completely fills the channel, the grout will overflow from the outlet pipe. Construction personnel can judge whether the channel is dense by observing the grout discharge status (such as grout concentration and air bubble content). This "bottom-in, top-out" grouting design not only effectively removes air from the ducts, preventing voids or honeycomb defects, but also utilizes pressure differences to make the grouting material more tightly wrap the reinforcing bars, significantly improving the bond between the reinforcing bars and concrete.

[0038] Furthermore, the positioning channel 26 is formed by pre-embedded metal corrugated pipe in the prefabricated cap beam 2.

[0039] Furthermore, the grouting sleeve 24 can be either a fully grouted sleeve or a semi-grouted sleeve, depending on the actual needs of the project. A fully grouted sleeve connects the reinforcing bars at both ends using grouting, making it suitable for bridge projects with extremely high requirements for connection strength and seismic performance. By grouting the reinforcing bars at both ends, the reinforcing bars and the sleeve form a strong whole, effectively transmitting tensile and compressive forces. A semi-grouted sleeve has a grouted connection at one end and a mechanical thread connection at the other, offering convenient installation and high construction efficiency. It is often used in locations with high construction progress requirements and relatively stable stress conditions. Its mechanical connection end can be pre-processed in the factory, requiring only the grouting end to be operated on-site, significantly shortening the installation time.

[0040] Furthermore, two lifting rings are pre-embedded on the top supports of the first segmented cap beam 21 and the second segmented cap beam 22 for hoisting and installing the prefabricated cap beams.

[0041] Furthermore, the upper end of the ordinary steel bar 12 at the cast-in-place joint 23 of the cap beam is provided with external threads, and is threadedly connected to the ordinary connecting steel bar 25 through the mechanical connecting sleeve 281. Specifically, before pouring the concrete at the cast-in-place joint 23 of the cap beam, the upper ends of the ordinary connecting steel bar 25 and the ordinary steel bar 12 are first fixed together through the mechanical connecting sleeve 281. After the connection is completed, the concrete pouring operation is carried out at the cast-in-place joint 23 of the cap beam.

[0042] Example 2 Combination Figure 1-9 ,like Figure 10 As shown, this invention provides a construction method for a prefabricated small-hinged segmented cap beam-pier connection structure, which is implemented using the aforementioned prefabricated small-hinged segmented cap beam-pier connection structure. The specific steps are as follows: S100: Based on the design drawings, erect the formwork for the precast pier column 1, accurately position the ordinary steel bars 12 and the first positioning steel bars 13, and after completing the steel bar positioning process, pour concrete and carry out curing operations in accordance with the curing specifications to ensure that the strength of the precast pier column 1 meets the design requirements. S200: According to the design scheme, the precast cap beam 2 is precast in sections. The first section cap beam 21 and the second section cap beam 22 are made separately. The template structures of the first section cap beam 21 and the second section cap beam 22 are built respectively. The positioning and installation of the grouting sleeve 24, the ordinary connecting steel bar 25 and the positioning channel 26 are completed in sequence. Then, concrete is poured and cured to make each section cap beam reach the predetermined design strength standard. S300: Rubber pads are set on both sides of the top of each precast pier 1. The first segmented cap beam 21 is lifted and installed to the predetermined position using hoisting equipment. The grouting sleeve 24 and positioning hole 26 reserved in the first segmented cap beam 21 are precisely aligned with the ordinary steel bar 12 and the first positioning steel bar 13 embedded in the precast pier 1. After cleaning the interface between the upper and lower components, the first segmented cap beam 21 is placed on the rubber pads. The positioning component 28 is used to achieve temporary connection and fixation between the first segmented cap beam 21 and the precast pier 1. Furthermore, the thickness of the rubber pad is determined based on the theoretical thickness of the junction layer 3 and the actual measured elevation deviation, in order to eliminate the elevation deviation, and the top surface of the rubber pad should be in close contact with the bottom of the beam.

[0043] Specifically, the theoretical junction layer thickness data is obtained based on the design drawings. At the same time, the actual elevation of the top of the precast pier 1 is measured using a precision measuring instrument. The deviation between the theoretical junction layer thickness and the actual measured elevation is calculated. Based on this deviation, rubber pads of the corresponding thickness specifications are selected or a multi-layer stacking method is used to adjust the elevation, thereby eliminating the elevation deviation during the installation of the precast components. During the installation process, the top surface of the rubber pad should be in close contact with the bottom of the first segment cap beam 21 or the second segment cap beam 22 to ensure that there is no gap between them.

[0044] S400: Verify the elevation of the top of the cap beam. After confirming that it is correct, tighten the positioning nut 283 at the second positioning steel bar 282. At the same time, perform grouting filling operations on the grouting sleeve 24 and the positioning channel 26. S500: Repeat steps S300 to S400 to complete the hoisting operation of the second segment cap beam 22. After the second segment cap beam 22 is installed, the binding work of the connecting steel bars between the first segment cap beam 21 and the second segment cap beam 22 is carried out, and the upper end of the ordinary connecting steel bar 25 and the ordinary steel bar 12 are fixed by mechanical connecting sleeve 281. The grouting side formwork 4 is installed around the top of the precast pier column 1. Concrete is poured into the pier column cast-in-place section 11 and the junction layer 3 in sequence through the cap beam cast-in-place joint 23. Finally, the cap beam cast-in-place joint 23 is poured. Furthermore, after the cast-in-place joint 23 of the cap beam is poured, the installation groove 27 is filled with concrete and smoothed.

[0045] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A connecting structure of a fabricated small-hinge-joint split cap beam-pier, characterized in that, The utility model relates to a prefabricated pier column and prefabricated cap beam joint structure, which comprises at least two prefabricated pier columns (1), a prefabricated cap beam (2) and an interface layer (3), wherein the prefabricated pier column (1) is fixedly installed on the top of a bearing platform, the top of the prefabricated pier column (1) is provided with the interface layer (3), the top of the interface layer (3) is provided with the prefabricated cap beam (2), and the prefabricated cap beam (2) is connected with the prefabricated pier column (1) through the interface layer (3). The prefabricated pier column (1) is provided with a cavity in the middle part, the top of the prefabricated pier column (1) is provided with a pier column cast-in-place section (11), the prefabricated cap beam is tightly connected with the prefabricated pier column (1) through cast-in-place concrete, and the overall stability of the structure is enhanced. The prefabricated cap beam (2) comprises a first split cap beam (21) and a second split cap beam (22), and the first split cap beam (21) and the second split cap beam (22) are provided with a cap beam cast-in-place joint (23) in the middle part, a plurality of ordinary connecting steels (25) are embedded in the connecting area of the first split cap beam (21) and the second split cap beam (22) and the prefabricated pier column (1), the bottom of the plurality of ordinary connecting steels (25) is fixedly installed with a grouting sleeve (24), the grouting sleeve (24) is sleeved on the outer side of the ordinary steel (12), the connecting area of the first split cap beam (21) and the second split cap beam (22) and the prefabricated pier column (1) is provided with a plurality of positioning channels (26) penetrating through the first split cap beam (21) and the second split cap beam (22), the top of the positioning channel (26) is provided with a mounting groove (27), and the positioning channel (26) and the mounting groove (27) are fixedly installed with a positioning assembly (28); the first split cap beam (21) and the second split cap beam (22) are positioned and installed on the top of the prefabricated pier column (1) through the positioning assembly (28).

2. The connecting structure of the fabricated small-hinge joint split cover beam-bridge pier according to claim 1, characterized in that, The top of the first positioning steel (13) is provided with an external thread.

3. The connecting structure of the fabricated small-hinge joint split cover beam-bridge pier according to claim 1, characterized in that, The upper end of the ordinary connecting steel (25) is provided with a 90-degree hook, and the 90-degree hook faces the outer side of the prefabricated cap beam (2).

4. The connecting structure of the fabricated small-hinge joint split cover beam-bridge pier according to claim 1, characterized in that, The positioning assembly (28) comprises a mechanical connecting sleeve (281), a second positioning steel (282), a positioning nut (283) and a steel backing plate (284), the lower end of the mechanical connecting sleeve (281) is threadedly connected with the positioning steel (13) embedded in the prefabricated pier column (1), the other end is threadedly connected with the lower end of the second positioning steel (282), the bottom of the mounting groove (27) is provided with the steel backing plate (284), the upper end of the second positioning steel (282) penetrates out of the positioning channel (26), extends to the mounting groove (27) and penetrates out of the steel backing plate (284), and the second positioning steel (282) is fixed in the mounting groove (27) through the positioning nut (283).

5. The connecting structure of the fabricated small-hinge joint split cover beam-bridge pier according to claim 4, characterized in that, The bottom of the positioning channel (26) is provided with a channel grouting pipeline (261), one end of the channel grouting pipeline (261) communicates with the positioning channel (26), and the other end extends out of the top of the prefabricated cap beam (2); the top of the positioning channel (26) is provided with a channel grouting pipeline (262), one end of the channel grouting pipeline (262) communicates with the positioning channel (26), and the other end extends out of the top of the prefabricated cap beam (2).

6. The connecting structure of the fabricated small-hinge joint split cover beam-bridge pier according to claim 1, characterized in that, The grouting sleeve (24) is fixedly installed with an inlet pipe (241) at the bottom, one end of which communicates with the grouting sleeve (24), and the other end of which extends out of the precast cap beam (2); the grouting sleeve (24) is fixedly installed with an outlet pipe (242) at the top, one end of which communicates with the grouting sleeve (24), and the other end of which extends out of the precast cap beam (2).

7. The connecting structure of the fabricated small-hinge joint split cover beam-bridge pier according to claim 6, characterized in that, The grouting sleeve (24) can be a full grouting sleeve or a half grouting sleeve according to actual engineering requirements.

8. A construction method of an assembled small-hinge-joint split cap beam-pier connecting structure, characterized in that, The application discloses a connecting structure of a fabricated small-hinge-joint split cap beam-pier, and belongs to the technical field of bridge construction. S100: According to the design drawing, the formwork of the precast pier column (1) is erected, the ordinary steel bars (12) and the first positioning steel bars (13) are accurately positioned, and after the steel bar positioning process is completed, the concrete is poured, and the maintenance operation is carried out according to the maintenance specification, so that the strength of the precast pier column (1) meets the design requirement; S200: According to the design scheme, the precast cap beam (2) is split precast, the first split cap beam (21) and the second split cap beam (22) are respectively manufactured, the formwork structure of the first split cap beam (21) and the second split cap beam (22) is respectively erected, the positioning and installation of the grouting sleeve (24), the ordinary connecting steel bar (25) and the positioning hole (26) are sequentially completed, and then the concrete pouring and maintenance treatment are carried out, so that each split cap beam reaches the predetermined design strength standard; S300: Rubber pads are arranged at the top of each precast pier column (1) on both sides, the first split cap beam (21) is hoisted and installed to a predetermined position by using hoisting equipment, the grouting sleeve (24) and the positioning hole (26) reserved in the first split cap beam (21) are accurately positioned with the ordinary steel bars (12) and the first positioning steel bars (13) pre-buried in the precast pier column (1), the upper and lower component joint surfaces are cleaned, then the first split cap beam (21) is arranged on the rubber pads, and the temporary connection and fixation of the first split cap beam (21) and the precast pier column (1) are realized through the positioning assembly (28); S400: The top elevation of the cap beam is rechecked and detected, the positioning nut (283) at the second positioning steel bar (282) is fastened after it is confirmed that there is no error, and the grouting sleeve (24) and the positioning hole (26) are filled with grouting; S500: The steps of S300 to S400 are repeated, the hoisting construction operation of the second split cap beam (22) is completed, the binding work of the connecting steel bar between the first split cap beam (21) and the second split cap beam (22) is carried out after the installation of the second split cap beam (22) is completed, the upper end of the ordinary connecting steel bar (25) is fixedly connected with the ordinary steel bar (12) through the mechanical connecting sleeve (281), the grouting side formwork (4) is installed at the top of the precast pier column (1) on all sides, the concrete is poured into the pier cast-in-place section (11) and the joint layer (3) in sequence through the cap beam cast-in-place joint (23), and finally the cap beam cast-in-place joint (23) is poured.

9. The construction method of the connecting structure of the fabricated small hinge joint split cap beam-pier according to claim 8, characterized in that, The thickness of the rubber pad is determined according to the thickness of the theoretical joint layer (3) and the actual measured elevation deviation, so as to eliminate the elevation deviation, and the top surface of the rubber pad should be closely attached to the beam bottom.

10. The construction method of the assembled small hinge joint split cover beam-bridge pier connecting structure according to claim 8, characterized in that, After the pouring of the cap beam cast joint (23) is completed, the installation groove (27) is filled with concrete and smoothed.

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