Segmented prestress applying device suitable for segmental assembly column and construction method

Abstract

The application relates to a segmented prestress applying device suitable for a segmentally assembled column, comprising load-bearing segments, fixing sleeves, sliding adjusting bolts and fences, the load-bearing segments are arranged in multiple and vertical superposition, sliding adjusting bolts are arranged between adjacent load-bearing segments, the sliding adjusting bolts are externally sleeved with the fixing sleeves, and the fixing sleeves are externally provided with the fences. The application is applied to a fabricated concrete pier, standardized connecting positions are reserved in each concrete block, through cooperation of high-strength bolts and high-performance metal sleeves, segmented assembly and instant pre-tightening locking can be realized on site, the pier can be assembled and formed like a building block, prestress can be applied through the bolts for locking after each assembly, continuity and high efficiency of construction are ensured, reliable axial compression between the segments and overall stress transmission are ensured, and finally a complete integral pier structure is formed.

Description

Technical Field

[0001] This invention relates to the fields of prestressed structures, structural vibration reduction and isolation, and energy-dissipating self-resetting structures. More specifically, it relates to a segmented prestressing application device suitable for segmented assembled columns. Background Technology

[0002] In recent years, with the continuous development of prefabricated bridge structure technology, the prefabricated construction of bridge piers has gradually become an important direction in the field of bridge construction. While traditional cast-in-place bridge piers offer good overall integrity, their long construction cycle hinders industrialized production and construction efficiency, making them particularly unsuitable for urban construction scenarios with tight schedules and limited space. To achieve standardized, modular, and rapid construction of bridge components, fully prefabricated concrete bridges are increasingly widely used. Prefabricated bridge piers are a core preliminary step in the construction of fully prefabricated bridges, and the connection methods between the various concrete segments directly affect the overall construction quality and load-bearing performance of the bridge. Currently, commonly used connection methods mainly include wet joint connections, sleeve grouting connections, and dry bolt connections. Wet joint connections require on-site pouring to a specified strength, significantly limiting the construction period; sleeve grouting connections are relatively complex and require high precision, with construction quality heavily constrained by on-site technical limitations.

[0003] In contrast, dry-joint methods offer advantages such as simple construction, fast assembly speed, high prefabrication rate, strong controllability, and the ability to perform repeated assembly. Segmented assembly structures, which further subdivide components, offer superior inter-segment transportation and on-site hoisting performance, showing broad application prospects. However, due to design considerations, non-grouting dry-joint segmental assembly structures often require prestressing to enhance structural integrity, but prestressing throughout the segments lacks ease of construction. Traditional prefabricated segmental bridge piers suffer from insufficient integrity at the connection points, uneven prestressing transfer throughout, poor construction performance, and difficulties in post-earthquake maintenance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a segmented prestressing application device and construction method suitable for segmented assembled columns, which can ensure the continuity and efficiency of construction, and ensure that reliable axial clamping force and overall force transmission are formed between each segment, so as to form a complete integral bridge pier structure.

[0005] The technical solution adopted by the present invention to solve its technical problem is: to construct a segmented prestressing application device suitable for segmented assembled columns, characterized in that it includes load-bearing segments, fixed sleeves, sliding adjusting bolts and enclosures, wherein the load-bearing segments include multiple segments and are vertically stacked, and sliding adjusting bolts are provided between adjacent load-bearing segments, the fixed sleeves are sleeved on the outside of the sliding adjusting bolts, and the enclosures are provided on the outside of the fixed sleeves.

[0006] According to the above scheme, the load-bearing segment is a square structure of reinforced concrete. The upper and lower surfaces of the load-bearing segment are provided with recessed working gaps at the four edges. The working gaps on the upper and lower surfaces are arranged vertically and horizontally, respectively. A through steel wire rope is vertically arranged between the vertically and horizontally arranged working gaps. A steel wire rope protective ring is provided at the bottom of the working gap where the through steel wire rope meets the working gap.

[0007] According to the above scheme, three work-reserved gaps are set on each side of the load-bearing segment, and the cross-section of the work-reserved gaps is square.

[0008] According to the above scheme, a sliding adjusting bolt is installed through the through steel wire rope located in the middle of the reserved gaps on the left and right sides of the upper surface, and a fixing sleeve is fixedly installed on the through steel wire rope located in the middle of the reserved gaps on the front and back sides of the upper surface. A fixed sleeve is fixedly installed on the through steel wire rope located in the middle of the reserved gaps on the left and right sides of the lower surface, and a sliding adjusting bolt is installed through the through steel wire rope located in the middle of the reserved gaps on the front and rear sides of the lower surface.

[0009] According to the above scheme, the fixing sleeve includes an outer sleeve wall and an inner sleeve thread, the inner sleeve thread is sleeved inside the outer sleeve wall, and the inner sleeve thread is a sleeve with engraved inner surface. The top / bottom of the outer wall of the sleeve is fixedly connected to the end of the through steel wire rope to form a sleeve weld point.

[0010] According to the above scheme, the outer wall of the sleeve is forged from high-strength chromium-molybdenum alloy steel.

[0011] According to the above scheme, the sliding adjusting bolt is a sliding bolt, which includes a bolt head and a bolt tooth. The bolt tooth is located at the top of the bolt head. The coaxial center portion of the bolt head and the bolt tooth is hollowed out to form a hollow part. The through steel wire rope passes completely through the hollow part. The sliding bolt can slide freely after the through steel wire rope passes through it. A limit end is fixedly provided at the end of the through steel wire rope passing through the hollow part.

[0012] According to the above scheme, the sliding adjusting bolt is made of high-strength alloy steel through quenching and tempering heat treatment process, and has a standard cylindrical rod structure.

[0013] According to the above scheme, the axial direction of the sliding adjusting bolt is coaxial with the axial direction of the fixed sleeve, and the limiting end has a sharpened cross section that facilitates the insertion of the bolt teeth together into the fixed sleeve.

[0014] According to the above plan, the enclosure adopts a steel structure.

[0015] Implementing the segmented prestressing application device for segmented assembled columns according to the present invention has the following beneficial effects: 1. This invention, through the segmented steel wire rope end adjustable bolt-sleeve design, can achieve precise and controllable prestress application during the assembly process, so that a stable and uniform axial clamping force is formed between the end faces of each concrete component segment; this structure can effectively suppress joint slippage and cracking, improve the overall stiffness and load-bearing stability of the bridge pier, and significantly improve the overall stress performance of the prefabricated structure. 2. The connection system of the present invention does not require wet work, and can achieve "segment-by-segment assembly and tightening" during construction, which greatly enhances the safety of the construction process. Furthermore, it eliminates the need to wait for grouting and curing, significantly shortening the construction cycle. The standardized design of each reserved connection position facilitates factory production and rapid on-site positioning, making the pier assembly process as efficient and controllable as "building block assembly". The segmented assembly structural components occupy less space, resulting in significant transportation friendliness and hoisting operability. 3. The wire rope connection of this invention differs from traditional rigid prestressed steel bars, possessing a certain degree of horizontal flexibility and vertical ductility. It allows for controllable relative displacement and rotation between structural segments under earthquakes or loads, effectively releasing concentrated stress. This characteristic significantly improves the ductility and energy dissipation capacity of precast concrete components under strong earthquakes, transforming the structure from a "collapse-resistant" rigid system into a "controllable swaying and resetting" resilient system. Structural toughness and safety are significantly improved. By setting high-strength prestressed connection points in each concrete block, the pier can achieve overall coordinated deformation under earthquakes, avoiding concentrated node failure and significantly improving the structure's seismic toughness and safety performance. 4. The present invention realizes the transformation of the dry connection of prefabricated bridge pier segments from rigid splicing to segmented prestressed flexible connection. The segmented steel wire rope adjustable bolt-sleeve device has a specially designed installation space, which can be used for construction, installation, service use and post-earthquake maintenance. It can make damaged components replaceable after an earthquake, significantly improving the convenience of maintenance and service performance of segmented prefabricated bridge piers.

[0016] 5. The prestressed bolt connection component of the present invention not only solves the technical problems of insufficient connection strength, unstable prestress, and difficulty in post-earthquake repair in traditional prefabricated bridge piers, but also has multiple advantages such as high strength, high durability, maintainability, and repositionability, providing high-performance and engineering-based technical support for the promotion and application of prefabricated bridges. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings: Figure 1This is a schematic diagram of the structure of the segmented prestressing application device applicable to segmented assembled columns according to the present invention; Figure 2 This is a structural schematic diagram of the load-bearing segment and its auxiliary parts of the present invention; Figure 3 This is a schematic diagram of the load-bearing segment, sliding adjusting bolt, and their auxiliary parts of the present invention; Figure 4 This is a schematic diagram of the fixed sleeve and sliding adjusting bolt of the present invention.

[0018] In the diagram: 1. Load-bearing segment, 2. Fixed sleeve, 3. Sliding adjusting bolt, 4. Enclosure, 101. Through steel wire rope, 102. Steel wire rope protective ring, 103. Pre-reserved clearance for operation, 201. Outer wall of sleeve, 202. Inner thread of sleeve, 203. Weld point of sleeve, 301. Sliding bolt, 302. Bolt head, 303. Bolt thread, 304. Hollow part, 305. Limiting end. Detailed Implementation

[0019] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0020] like Figure 1-4 As shown, the segmented prestressing application device of the present invention for segmented assembled columns includes a load-bearing segment 1, a fixed sleeve 2, a sliding adjusting bolt 3, and a retaining wall 4. The load-bearing segments 1 include multiple segments and are arranged vertically stacked. A sliding adjusting bolt 3 is provided between adjacent load-bearing segments 1. A fixed sleeve 2 is sleeved on the outside of the sliding adjusting bolt 3, and a retaining wall 4 is provided on the outside of the fixed sleeve 2.

[0021] In a preferred embodiment of the present invention, the load-bearing segment 1 is a square reinforced concrete structure. Recessed working gaps 103 are symmetrically arranged at the four edges of the upper and lower surfaces of the load-bearing segment 1. A through steel wire rope 101 is vertically arranged between the symmetrical working gaps 103. A steel wire rope protective ring 102 is provided at the bottom where the through steel wire rope 101 connects to the working gap 103. Recessed working gaps 103 are provided at the four edges of both the upper and lower surfaces of the load-bearing segment 1. The working gaps 103 on the upper and lower surfaces are vertically aligned and horizontally aligned. In this embodiment, the load-bearing segment 1 is a square reinforced concrete segment with a side length ranging from 1000-2000 mm; in this example, the length is 2000 mm. Three square working gaps 103, each 300mm in diameter and with a cross-section of 250mm, are provided on the four sides of the upper and lower surfaces. A through steel wire rope 101 with a diameter of 28mm is provided in the center of the working gap 103, and steel wire rope protective rings 102 are provided at the separation points between the working gap 103 and the through steel wire rope 101 on the upper and lower bottom surfaces. The load-bearing segment 1 is assembled to form the main structure of the column. A through steel wire rope 101 located in the middle of the working reserved gaps 103 on the left and right sides of the upper surface is fitted with a sliding adjusting bolt 3. A fixing sleeve 2 is fixedly installed on the through steel wire rope 101 located in the middle of the working reserved gaps 103 on the front and rear sides of the upper surface. A fixing sleeve 2 is fixedly installed on the through steel wire rope 101 located in the middle of the working reserved gaps 103 on the left and right sides of the lower surface. A sliding adjusting bolt 3 is fixedly installed on the through steel wire rope 101 located in the middle of the working reserved gaps 103 on the front and rear sides of the lower surface.

[0022] In a preferred embodiment of the present invention, the fixing sleeve 2 includes an outer sleeve wall 201 and an inner sleeve thread 202. The inner sleeve thread 202 is fitted inside the outer sleeve wall 201, and the inner sleeve thread 202 is a sleeve with an engraved inner surface. The outer sleeve wall 201 is forged from high-strength chromium-molybdenum alloy steel. The inner diameter difference between the outer sleeve wall 201 and the inner sleeve thread 202 is 30mm. The inner sleeve thread 202 has an engraved inner surface. The top / bottom of the outer sleeve wall 201 is fixedly connected to the end of the through steel wire rope 101 to form a sleeve weld point 203. The sleeve weld point 203 has a gradually expanding cross section to ensure a tight connection between the sleeve and the through steel wire rope 101.

[0023] In a preferred embodiment of the present invention, the sliding adjusting bolt 3 is a sliding bolt, comprising a bolt head 302 and bolt teeth 303. The bolt teeth 303 are located at the top of the bolt head 302. A hollow portion 304 is formed by hollowing out the coaxial center portion of the bolt head 302 and the bolt teeth 303. A through-wire rope 101 passes completely through the hollow portion 304. The sliding bolt 301 can slide freely after the through-wire rope 101 passes through it. A limiting end 305 is fixedly provided at the end of the through-wire rope 101 passing through the hollow portion 304. The sliding adjusting bolt 3 is made of high-strength alloy steel through a quenching and tempering heat treatment process and has a standard cylindrical rod structure. The axial direction of the sliding adjusting bolt 3 is coaxial with the axial direction of the fixed sleeve 2, which helps to form a stable prestressed force transmission path. The limiting end 305 has a tapered cross section that facilitates the insertion of the bolt teeth 303 together into the fixed sleeve 2. In this embodiment, the bolt head 302 and bolt teeth 303 within the sliding adjusting bolt 3 together form a sliding bolt with an inner diameter of 70mm. The center of the sliding bolt is hollowed out to form a hollow portion 304, which allows the through-wire rope 101 to pass through completely, and the sliding bolt can slide freely after the through-wire rope 101 passes through. A limiting end 305 with an inner diameter of 60mm is provided at the head of the through-wire rope 101 passing through the hollow portion 304. The limiting end 305 is welded tightly to the through-wire rope 101, and has a tapered cross-section, facilitating the insertion of the sliding bolt together into the fixing sleeve 2. The fixing sleeve 2 cooperates with the sliding adjusting bolt 3, and through the mechanical locking and frictional force transmission of the sleeve's inner teeth 202 and the bolt teeth 303, it is mainly used to apply vertical prestress between adjacent load-bearing sections 1.

[0024] The enclosure 4 is made of steel and is wrapped between the pre-reserved gaps 103 of the upper and lower load-bearing sections 1. It mainly serves to fill the gaps, block sunlight, block debris and moisture, and maintain the aesthetic appearance of the facade. Its height is determined based on the height of the polyurea ring in the actual project. Its main function is to effectively prevent external moisture, dust and other impurities from entering the construction area, so as to reduce the adverse effects of the external environment on the construction quality.

[0025] The construction method of this invention draws on the "building block" style of layer-by-layer assembly, dividing the pier construction process into an orderly stacking process of several standardized precast concrete blocks. During construction, each precast concrete block is hoisted, positioned, and assembled layer by layer from bottom to top according to a predetermined spatial position and installation sequence. Upon completion of the installation of a single block, the connection interface between it and the lower block is immediately locked. Compared with traditional cast-in-place construction methods, the core feature is "layered installation, block-by-block locking, and step-by-step application of prestress." After each concrete block is assembled, the contact surfaces of adjacent blocks are constrained and compressed through a connection system, ensuring that the newly installed block is not only precisely aligned geometrically but also establishes a stable prestress state with the lower block in terms of mechanical properties. As the number of construction layers increases, the prestress is transmitted and accumulated layer by layer along the vertical direction of the pier, gradually forming a continuous, stable, and collaborative overall structural system between the blocks.

[0026] Ultimately, once all the concrete blocks are assembled according to design requirements, the entire pier structure no longer appears as a simple stacking of several independent precast units. Instead, through the coupling of connection, locking, and prestressing, it forms a complete pier with clear stress distribution, good integrity, and a balance of stiffness and stability. This construction method not only significantly improves the degree of prefabrication in construction and reduces on-site formwork erection and wet work, but also helps to improve construction efficiency, enhance structural quality control, and provide an effective technical path for the industrialization, standardization, and rapid construction of bridge substructures.

[0027] The construction process, service life, and disaster prevention performance of this invention are as follows: Before pouring the load-bearing segment 1, a through steel wire rope 101 is pre-embedded, and a steel wire rope protective ring 102 is pre-embedded at the separation point between the through steel wire rope 101 and the load-bearing segment 1. After demolding, the customized template forms a pre-reserved gap 103 for operation. Each through steel wire rope 101 in the load-bearing segment 1 has a fixing sleeve 2 and a sliding adjusting bolt 3 installed at its upper and lower ends, respectively. The contact surfaces of adjacent load-bearing segments 1 have matching fixing sleeves 2 and sliding adjusting bolts 3. When installing a new load-bearing segment 1 on an existing load-bearing segment 1, ensure that the limiting end 305 is first inserted into the matching fixed sleeve 2. At this time, the sliding bolt 301 has not yet been screwed into the fixed sleeve 2. The sliding bolt 301 is squeezed by the outer wall 201 of the sleeve and slides outward through the wire rope 101. Then, by twisting the bolt head 302, the bolt teeth 303 are rotated and embedded into the inner teeth 202 of the sleeve. The inner teeth 202 of the sleeve have sufficient space for the bolt teeth 303 to be screwed in. Then, the prestress value of the vertical bolt connection can be determined according to the torque after tightening. Repeat this step to complete the flexible segmented prestressed connection of the present invention.

[0028] Under normal service conditions, the fixed sleeve 2 and the sliding adjusting bolt 3 will not loosen after tightening, and the prestress can be maintained for a long time. However, under extreme horizontal loads such as earthquakes, the connection between the fixed sleeve 2 and the sliding adjusting bolt 3 remains tight, but the through steel wire rope 101 connected to the fixed sleeve 2 and the sliding adjusting bolt 3 has horizontal flexibility, allowing a certain degree of horizontal displacement between adjacent load-bearing segments 1, which has the effect of improving structural ductility and seismic performance. When the seismic load is extremely high, the preload between the fixed sleeve 2 and the sliding adjusting bolt 3 can be gradually loosened with reciprocating motion. Their synergistic effect can effectively absorb energy, further release the horizontal stiffness of the structure, achieve a change in the structural seismic isolation system, and significantly improve the seismic toughness and functional recoverability of the structure.

[0029] This invention utilizes relatively flexible steel wire ropes to provide segmented vertical prestressing for the columns. The prestressing is applied via specially designed adjustable bolts and sleeves. Installation space for this application device is reserved within the segments, and the device features sliding fastening bolts for easy installation, significantly improving the feasibility and operability of segmented prestressing construction. Modular construction and maintainability design: Each concrete component, after being connected by bolt prestressing, forms a locally stable unit, enabling efficient "assembly and fastening of each section" operation during construction. The bolts and sleeves in this system can be independently replaced during later maintenance. When connecting components age or corrode, they can be quickly replaced without removing the main concrete structure, greatly improving the durability and maintainability of the structure. This system transforms the dry connection of prefabricated bridge pier segments from rigid splicing to segmented prestressed flexible connection, effectively improving the overall stress resistance and seismic toughness of the segmented prefabricated bridge piers. Meanwhile, the use of segmented steel wire rope adjustable bolt-sleeve device can make the prestress transfer between segments more precise, the temporary adjustment during construction is simple and the construction is efficient. It can also make damaged components replaceable after an earthquake, which significantly improves the construction convenience and service performance of segmented prefabricated bridge piers.

[0030] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A segmented prestressing application device suitable for segmented assembled columns, characterized in that, It includes load-bearing segments, fixed sleeves, sliding adjusting bolts, and enclosures. The load-bearing segments include multiple segments that are vertically stacked. Sliding adjusting bolts are provided between adjacent load-bearing segments. Fixed sleeves are fitted around the sliding adjusting bolts, and enclosures are provided around the fixed sleeves.

2. The segmented prestressing application device for segmented assembled columns according to claim 1, characterized in that, The load-bearing segment is a square reinforced concrete structure. Recessed working gaps are provided at the four edges of the upper and lower surfaces of the load-bearing segment. The working gaps on the upper and lower surfaces are arranged vertically and horizontally, respectively. A through steel wire rope is vertically arranged between the vertically and horizontally arranged working gaps. A steel wire rope protective ring is provided at the bottom of the working gap where the through steel wire rope meets the working gap.

3. The segmented prestressing application device for segmented assembled columns according to claim 2, characterized in that, Three work-reserved gaps are provided on each side of the load-bearing segment, and the cross-section of the work-reserved gaps is square.

4. The segmented prestressing application device for segmented assembled columns according to claim 3, characterized in that, A sliding adjusting bolt is installed on the through steel wire rope located in the middle of the reserved gaps on the left and right sides of the upper surface. A fixing sleeve is fixedly installed on the through steel wire rope located in the middle of the reserved gaps on the front and back sides of the upper surface. A fixed sleeve is fixedly installed on the through steel wire rope located in the middle of the reserved gaps on the left and right sides of the lower surface, and a sliding adjusting bolt is installed through the through steel wire rope located in the middle of the reserved gaps on the front and rear sides of the lower surface.

5. The segmented prestressing application device for segmented assembled columns according to claim 4, characterized in that, The fixing sleeve includes an outer sleeve wall and an inner sleeve thread, the inner sleeve thread being fitted inside the outer sleeve wall, and the inner sleeve thread being a sleeve with engraved inner surface. The top / bottom of the outer wall of the sleeve is fixedly connected to the end of the through steel wire rope to form a sleeve weld point.

6. The segmented prestressing application device for segmented assembled columns according to claim 5, characterized in that, The outer wall of the sleeve is forged from high-strength chromium-molybdenum alloy steel.

7. The segmented prestressing application device for segmented assembled columns according to claim 4, characterized in that, The sliding adjusting bolt is a sliding bolt, which includes a bolt head and a bolt tooth. The bolt tooth is located at the top of the bolt head. The coaxial center portion of the bolt head and the bolt tooth is hollowed out to form a hollow part. The through steel wire rope passes completely through the hollow part. The sliding bolt can slide freely after the through steel wire rope passes through it. A limit end is fixedly provided at the end of the through steel wire rope passing through the hollow part.

8. The segmented prestressing application device for segmented assembled columns according to claim 7, characterized in that, The sliding adjusting bolt is made of high-strength alloy steel through quenching and tempering heat treatment, and has a standard cylindrical rod structure.

9. The segmented prestressing application device for segmented assembled columns according to claim 7, characterized in that, The axis of the sliding adjusting bolt is coaxial with the axis of the fixed sleeve, and the limiting end has a tapered section that facilitates the insertion of the bolt teeth into the fixed sleeve.

10. The segmented prestressing application device for segmented assembled columns according to claim 1, characterized in that, The enclosure is made of steel.

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