Pier column cast-in-place beam assembly type construction support under complex environment and construction method thereof

Abstract

The invention discloses a pier column cast-in-place beam assembly type construction support under a complex environment and a construction method.The top of each pier column is provided with a transverse through hole in the width direction of a bridge, the construction support comprises two bearing beams, the two bearing beams are oppositely arranged on the two sides of each pier column, and any bearing beam abuts against the side wall of each pier column in the length direction of the bridge; a plurality of vertical through holes are formed in the bearing beam at intervals and are in one-to-one correspondence with the transverse through holes in the pier columns in position; the steering devices are correspondingly arranged at top openings of the vertical through holes; the hanging bars correspondingly penetrate through the transverse through holes, and the two ends of any hanging bar are steered through the steering devices on the same side, then penetrate through the corresponding vertical through holes downwards and are fixed to the bottom of the bearing beam through anchoring devices. The internal stress direction of the support is adjusted through the steering device, supporting and displacement adjustment of the bearing beams are achieved through the hanging bars arranged at the tops of the pier columns in a penetrating mode, the stress structures of the whole support and all components are optimized, and the applicability and construction stability of the support are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction. More specifically, the present invention relates to a cast-in-place beam assembled construction support for pier columns under complex environments and a construction method thereof. Background Art

[0002] Under complex geological or hydrological environments such as in water or mountainous areas, the transportation and installation of pier columns and beams are restricted by conditions such as roads and support foundations, resulting in problems such as high construction difficulty and low efficiency, and it is necessary to adopt the concrete cast-in-place process for construction. A large number of construction supports need to be erected during the construction of cast-in-place beams. Traditional construction supports include floor column-beam supports, hoop support brackets, or through-bar support brackets, etc. Among them, traditional floor column-beam supports require multiple rows of columns to be set up. The columns are mostly supported on the ground by means of driven piles or by setting spread foundations at the bottom, and large-scale mechanical equipment is required to cooperate with the construction, which is easily affected by factors such as hydrology, terrain, and geology. Especially in areas with poor geological conditions such as landslides and debris flows, or deep silt geology, rock geology, and areas with large flow velocities, there are disadvantages such as high construction difficulty, high construction risk, and long construction period; there is a risk of deformation of the hoop structure and failure of the fastening force under large loads in the hoop support bracket, which easily leads to safety and quality problems such as insufficient stability of the support and damage to the pier column structure, and it cannot be well adapted to the conditions of non-circular or circular piers with poor integrity, and there are limitations in the scope of use; the bearing capacity of the through-bar support bracket is insufficient, there are great potential safety hazards during construction, the construction quality cannot be guaranteed, and the structural dimensions of the through-bar are relatively large, resulting in difficult repair of the holes on the pier column after construction, which belongs to a bridge-limiting process.

[0003] To solve the above problems, it is necessary to design a cast-in-place beam assembled construction support for pier columns under complex environments and a construction method thereof to improve the applicability, stability, and safety of the cast-in-place beam support. Summary of the Invention

[0004] The object of the present invention is to provide a cast-in-place beam assembled construction support for pier columns under complex environments and a construction method thereof, which uses a steering device to adjust the internal force direction of the support and realizes the support and displacement adjustment of the cushion beam through the suspension bars passing through the top of the pier column, optimizes the force structures of the overall support and each component, and improves the applicability and construction stability of the support.

[0005] To achieve these objects and other advantages of the present invention, there is provided a cast-in-place beam assembled construction support for pier columns under complex environments. Transverse through-holes are provided along the bridge width direction at the top of each pier column. The cast-in-place beam assembled construction support for pier columns under complex environments includes: Two cushion beams, which are oppositely arranged on both sides of the pier column. Any one of the cushion beams is arranged along the bridge length direction and abuts against the side walls of each pier column. A plurality of vertical through-holes are provided at intervals along the length direction of the cushion beam, and their positions correspond one by one to the transverse through-holes on each pier column; Multiple steering devices, which are correspondingly arranged at the top openings of the respective vertical through holes and fixedly connected to the cushion beam; Multiple hanger bars, which correspondingly pass through the respective horizontal through holes. The two ends of any one hanger bar are respectively turned by the steering devices on the same side and then pass downward through the corresponding vertical through holes and are fixed to the bottom of the cushion beam by the anchoring devices.

[0006] Preferably, for the precast beam erection construction support for pier columns in a complex environment, the cushion beam includes multiple standard sections, which are continuously arranged along the bridge length direction, and any two adjacent standard sections are detachably connected.

[0007] Preferably, for the precast beam erection construction support for pier columns in a complex environment, it further includes a tensioning system, which includes two groups of tensioning blocks, which are correspondingly arranged with the two cushion beams. Any one group of tensioning blocks includes two tensioning blocks, which are oppositely arranged at both ends of the bottom of the corresponding cushion beam and fixedly connected to it; two groups of tensioning bars, which are correspondingly arranged with the two groups of tensioning blocks. Any one group of tensioning bars includes two tensioning bars, which are correspondingly arranged with the two tensioning blocks in the same group. Any one tensioning bar passes through the corresponding tensioning block along the length direction of the cushion beam and is anchored on the end face far from the other tensioning block; two tensioning devices, which are correspondingly arranged with the two groups of tensioning bars. Any one tensioning device connects the corresponding two tensioning bars and is used to adjust their relative tension.

[0008] Preferably, for the precast beam erection construction support for pier columns in a complex environment, the steering device includes two steering brackets, which are arranged at both sides of the corresponding vertical through hole at intervals along the length direction of the cushion beam; a rotating shaft, which connects the two steering brackets along the length direction of the cushion beam and is rotatably connected to them. The top end of the rotating shaft is flush with the bottom end of the horizontal through hole, and the side of the rotating shaft far from the horizontal through hole is flush with the side of the vertical through hole close to the horizontal through hole; a limiting device, which is arranged to limit the displacement of the hanger bar on the rotating shaft.

[0009] Preferably, for the precast beam erection construction support for pier columns in a complex environment, it further includes multiple tie rods, which are arranged at intervals along the length direction of the cushion beam at its bottom. Any one tie rod fixedly connects the two cushion beams along the bridge width direction and relatively tightens them.

[0010] Preferably, for the precast beam erection construction support for pier columns in a complex environment, the anchoring device includes a backing plate, which is arranged at the bottom opening of the vertical through hole and fixedly connected to the cushion beam. The backing plate is provided with a vertical through hole communicating with the vertical through hole; a locking member, which is arranged at the bottom of the backing plate and is used to relatively lock the bottom end of the corresponding hanger bar to the backing plate.

[0011] Preferably, the pier column cast-in-place beam assembled construction support under the complex environment also includes a plurality of distribution beams, which are erected on the top of the two cushion beams at intervals along the length direction of the bridge, and any distribution beam is arranged along the width direction of the bridge, and the cast-in-place beam formwork is installed on the top of the plurality of distribution beams.

[0012] Preferably, in the assembled construction support for the cast-in-situ beam of the pier column in the complex environment, a plurality of gusset plates are provided at intervals along the length direction on the top of the cushion beam.

[0013] The present invention also provides a construction method for a pier column cast-in-place beam assembled construction support in a complex environment, comprising: S1. Open transverse through holes at the top of each pier and insert corresponding hanger bars; S2. Install the corresponding steering device on the cushion beam, and then hoist the two cushion beams to both sides of the pier according to the designed position; S3, turning the two ends of each hanging bar through the corresponding turning device and passing it downward through the vertical through hole, and then anchoring the hanging bar at the bottom of the cushion beam through the anchoring device to form a support system; S4, using the two cushion beams as the supporting foundation to install the cast-in-place beam formwork and its accessory structures; S6. Adjusting the tension and structural displacement of the suspension bar through the anchoring device so that the bracket reaches a set stress state; S7, using the cast-in-place beam template to complete the cast-in-place beam construction, and finally removing the construction support and repairing the transverse through hole.

[0014] The present invention has at least the following beneficial effects: 1. The present invention uses a steering device to adjust the force direction inside the bracket, and realizes the support and displacement adjustment of the cushion beam by the hanger rods penetrating the top of the pier column, thereby optimizing the force structure of the overall bracket and each component, and using the existing pier column as the installation basis of the bracket, which is not restricted by the topographical geology and hydrological environment, avoids the influence of adverse construction conditions on the construction efficiency and construction quality of the cast-in-place beam, and effectively improves the applicability and construction stability of the bracket; 2. The construction support of the present invention has a simple structure, a high degree of assembly and is easy to manufacture, which is conducive to the transportation and installation of various components in a complex environment. The transverse through-holes for inserting the hanging bars are small in size, and the hanging bars can be quickly disassembled and assembled by pre-buried PVC pipes or by using the reserved holes in existing steel pipes, which is not easy to affect the structural quality of the pier body. It has the advantages of low cost, convenient construction, and convenient turnover. 3. In the present invention, the hanger bars and the cushion beams cooperate to form a stable adjustable support structure. During construction, the height of the support (i.e., the support height of the cushion beam) can be adjusted within a certain range according to actual working needs, realizing real-time and flexible adjustment of the support structure. At the same time, a tensioning system is provided at the bottom of the cushion beam, which can adjust the stress condition and bearing capacity of the cushion beam in real time, further optimizing the stress state of the support and improving the support strength, stiffness and stress stability of the construction support.

[0015] Other advantages, objectives and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the overall structure of an assembled construction support for a cast-in-place beam of a pier column in a complex environment according to an embodiment of the present invention; Figure 2 It is a schematic diagram of the top surface structure of the assembled construction support for a cast-in-place beam of a pier column in the complex environment described in the above embodiment; Figure 3 It is a sectional view taken along line A-A of the assembled construction support for a cast-in-place beam of a pier column in the complex environment described in the above embodiment; Figure 4 It is a sectional view taken along line B-B of the assembled construction support for a cast-in-place beam of a pier column in the complex environment described in the above embodiment; Figure 5 It is a schematic diagram of the side structure of the assembled construction support for a cast-in-place beam of a pier column in the complex environment described in the above embodiment; Figure 6 It is a schematic diagram of the bottom surface structure of the assembled construction support for a cast-in-place beam of a pier column in the complex environment described in the above embodiment.

[0017] Description of the Reference Numerals in the Drawings: 1. Pier column; 11. Transverse through-hole; 2. Cushion beam; 21. Standard section; 22. Vertical through-hole; 23. Connecting plate; 3. Steering device; 31. Steering bracket; 32. Rotating shaft; 4. Hanger bar; 5. Anchoring device; 51. Base plate; 6. Tensioning system; 61. Tensioning block; 62. Tensioning bar; 63. Tensioning device; 71. Tie rod; 72. Support; 73. Pin shaft; 81. Distribution beam; 82. Cast-in-place beam formwork; 9. Lacing plate. Detailed Embodiment

[0018] The following further describes the present invention in detail with reference to the drawings, so that those skilled in the art can implement it according to the description in the specification.

[0019] It should be noted that, unless otherwise specified, the experimental methods described in the following implementation schemes are all conventional methods, and the reagents and materials, unless otherwise specified, can all be obtained from commercial channels; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0020] As Figure 1-6 shown, the present invention provides a fabricated construction support for cast-in-place beams of pier columns in a complex environment. Along the bridge width direction, transverse through holes 11 are provided at the top of each pier column 1. The fabricated construction support for cast-in-place beams of pier columns in a complex environment includes: Two cushion beams 2, which are oppositely arranged on both sides of the pier column 1. Any one of the cushion beams 2 is arranged along the bridge length direction and abuts against the side wall of each pier column 1. A plurality of vertical through holes 22 are arranged at intervals along the length direction on the cushion beam 2, and their positions correspond to the transverse through holes 11 on each pier column 1 one by one; A plurality of steering devices 3, which are correspondingly arranged at the top openings of each vertical through hole 22 and fixedly connected to the cushion beam 2; A plurality of suspension bars 4, which correspondingly pass through each transverse through hole 11. The two ends of any one suspension bar 4 are respectively turned by the steering devices 3 on the same side and then pass downward through the corresponding vertical through hole 22 and are fixed to the bottom of the cushion beam 2 through an anchoring device 5.

[0021] In the above technical solution, the number of pier columns depends on the range of the cast-in-place beam to be constructed. The pier columns within the range of the beam segment to be poured (length) can be provided with transverse through holes and used for erecting the construction support to effectively share the construction load. The transverse through holes are radial through holes of the corresponding pier columns. In actual construction, the reserved hole channels (i.e., transverse through holes) can be formed by pre-burying PVC pipes / steel pipes at the top of the pier columns in advance, so as to facilitate the threading of the suspension bars, which is beneficial to realizing the quick disassembly and assembly between the suspension bars and the pier columns, and is also convenient for subsequent recycling. The size of the transverse through holes depends on the diameter of the suspension bars. The suspension bars can be selected from parallel steel wires, steel strands, steel ropes, etc., so that the above-mentioned suspension bar threading structure is quite different from the traditional core rod structure. The size of the transverse through holes is very small and is arranged at the top end of the pier column. While ensuring the bearing capacity of the support, it is not easy to damage the structural quality of the pier column body, and it is also convenient for grouting repair of the pier column after the cast-in-place beam construction is completed.

[0022] The steering device is used to achieve smooth steering and connection of the hanger bar between the horizontal through hole and the vertical through hole, and a conventional direction adjustment structure (such as a pulley, etc.) can be used. Each horizontal through hole corresponds to two vertical through holes, and the two vertical through holes are respectively located at the two ends of the horizontal through hole. The horizontal through hole is set horizontally, and the vertical through hole is set vertically. The above three through holes are in the same position in the length direction of the bridge (cushion beam). The anchoring device adopts an adjustable anchoring structure, so that the length of the hanger bar passing through the vertical through hole can be adjusted. Therefore, the support height of the cushion beam can be adjusted through the anchoring device, and then the tension of the hanger bar can be adjusted. It is helpful to optimize the internal force structure of the construction support in combination with the design parameters in actual construction, and improve the bearing capacity and support stability of the construction support.

[0023] The construction support of the present invention has a simple structure, a high degree of assembly and is easy to manufacture. A steering device is used to adjust the force direction inside the support, and the support and displacement adjustment of the cushion beam are achieved by hanging rods passed through the top of the pier column, thereby optimizing the force structure of the overall support and each component. The existing pier column is used as the installation basis of the support, which is not restricted by the topographical geology and hydrological environment, and avoids the influence of adverse construction conditions on the construction efficiency and construction quality of the cast-in-place beam, effectively improving the applicability and construction stability of the support, and has the advantages of low cost, convenient construction, and convenient turnover.

[0024] In another technical solution, in the assembled construction support for the cast-in-place beams of piers in complex environments, the cushion beam 2 includes a plurality of standard sections 21 which are continuously arranged along the length direction of the bridge, and any two adjacent standard sections 21 can be detachably connected.

[0025] Specifically, a connecting plate 23 is welded at the end of any standard section 21, which is fixed on the end face of the standard section 21 and the edge extends outward. The extended part is provided with a connecting hole. The corresponding connecting holes between adjacent connecting plates 23 can be connected as a whole through matching bolts to achieve a detachable connection between adjacent standard sections. The cushion beam is set as an assembled structure of multiple standard sections, and each standard section is prefabricated according to different length dimensions (with the same cross-sectional dimensions), which is convenient for extending or shortening the cushion beam according to actual construction needs. At the same time, the weight of a single standard section is light, which is convenient for transportation and installation construction in complex environments, and effectively improves the assembly degree of the construction support.

[0026] In another technical solution, the cast-in-situ beam prefabricated construction support for pier columns in a complex environment further includes a tensioning system 6, which includes two groups of tensioning blocks 61 corresponding to the two bearing beams 2. Any group of tensioning blocks includes two tensioning blocks 61, which are oppositely arranged at both ends of the bottom of the corresponding bearing beam 2 and fixedly connected thereto; two groups of tension bars 62 corresponding to the two groups of tensioning blocks 61. Any group of tension bars includes two tension bars 62 corresponding to the two tensioning blocks 61 in the same group. Any tension bar 62 passes through the corresponding tensioning block 61 along the length direction of the bearing beam 2 and is anchored on the end face far from the other tensioning block; two tensioning devices 63 corresponding to the two groups of tension bars 62. Any tensioning device 63 connects the corresponding two tension bars 62 and is used to adjust their relative tension forces.

[0027] In the above technical solution, the tensioning blocks are welded to the bottom of the bearing beam. The tension bars are prestressed tendons, which can be selected from parallel steel wires, steel strands, steel wire ropes, precision rolled threaded steel bars, etc. The tensioning device can be selected from conventional prestressed tensioning equipment. In this embodiment, the tensioning device includes two fixing blocks respectively fixed at the adjacent ends of the two tension bars in the same group; two sleeves respectively fixedly sleeved on the two fixing blocks. Any sleeve is provided with a plurality of tensioning holes at circumferential intervals, and any tensioning hole is arranged along the axial direction of the sleeve; a plurality of tension bolts corresponding to the plurality of tensioning holes one by one. The screw rod of any tension bolt sequentially passes through two opposite tensioning holes on the two sleeves, and the two tightening nuts of the tension bolt respectively press the end faces of the two sleeves from the outside. Among them, by rotating the tightening nuts, the relative tension force between the two tension bars can be adjusted, thereby realizing the adjustment of the internal stress and bearing capacity of the multi-section bearing beam. According to the construction requirements, the relative tension forces of the two tension bars are adjusted in real time, the adjustment of the internal stress condition of the bearing beam can be realized, thereby improving the bearing capacity of the bearing beam, further optimizing the stress state of the support structure in cooperation with the anchoring device, and improving the strength and stiffness of the traditional steel structure and expanding its application range.

[0028] In another technical solution, for the cast-in-situ beam prefabricated construction support for pier columns in a complex environment, the steering device 3 includes two steering brackets 31, which are arranged at intervals along the length direction of the bearing beam 2 on both sides of the corresponding vertical through hole 22; a rotating shaft 32 connecting the two steering brackets 31 along the length direction of the bearing beam 2 and rotatably connected thereto. The top end of the rotating shaft 32 is flush with the bottom end of the transverse through hole 11 (in the horizontal direction), and the side of the rotating shaft 32 away from the transverse through hole 11 is flush with the side of the vertical through hole 22 close to the transverse through hole 11 (in the vertical direction); a limiting device arranged to limit the displacement of the lifting bar 4 on the rotating shaft 32. Among them, the lifting bar 4 turns around the rotating shaft 32, changing from the horizontal direction when passing through the transverse through hole 11 to the vertical direction, so as to smoothly penetrate into the vertical through hole 22 directly below.

[0029] Specifically, the initial distance between the two steering brackets is greater than the diameter of the hanger bar. The limiting device is used to adjust the distance between the two steering brackets, and the limiting function is realized by pressing the hanger bar between the steering brackets. In this embodiment, any one of the steering brackets 31 is in a herringbone structure, which includes two support rods. The bottom ends of the two support rods are fixedly arranged on the top surface of the cushion beam at intervals along the width direction of the cushion beam. The two support rods are arranged obliquely relative to each other and fixedly connected at the top end. A through pin hole is arranged at the top end of any one of the support rods along the length direction of the cushion beam. The support rod can be processed from angle steel, channel steel, I-beam, etc. The rotating shaft 32 sequentially passes through the pin holes at the top ends of each support rod (four support rods) to connect the steering brackets. The rotating shaft is a threaded rod. The limiting device includes nuts respectively arranged at both ends of the rotating shaft and matching with its threads. By rotating the nuts, the top ends of the two rotating brackets are close to each other and press the hanger bar inward, and the limiting and fixing of the hanger bar can be realized.

[0030] In another technical solution, the prefabricated construction support for the cast-in-place beam of the pier column in a complex environment further includes a plurality of tie rods 71, which are arranged at intervals along the length direction of the cushion beam 2 at its bottom. Any one of the tie rods 71 is fixedly connected to the two cushion beams 2 along the width direction of the bridge and relatively tightens them. Specifically, supports 72 are arranged at the designed and installed positions of each tie rod 71 on the cushion beam. Pin holes are correspondingly arranged at the supports and the ends of the tie rods. During installation, the two ends of the tie rod 71 are respectively connected to the corresponding supports 72 through pins 73, which can effectively prevent the problem of the construction support tipping over. The tie rod can be selected from I-beam, channel steel, etc.

[0031] In another technical solution, for the prefabricated construction support for the cast-in-place beam of the pier column in a complex environment, the anchoring device 5 includes a backing plate 51, which is arranged at the bottom opening of the vertical through hole 22 and fixedly connected to the cushion beam 2. The backing plate 51 is provided with a vertical through hole communicating with the vertical through hole 22; a locking member, which is arranged at the bottom of the backing plate 51 and is used to relatively lock the bottom end of the corresponding hanger bar 4 to the backing plate 51. Among them, the backing plate 51 is welded to the bottom surface of the cushion beam 2 to improve the local stress at the anchoring position of the hanger bar. The locking member can be a nut matching with the hanger bar. After determining the installation height of the cushion beam, use the locking member to relatively lock the hanger bar to the backing plate and the cushion beam, and the stable support of the cushion beam can be completed; the installation height of the cushion beam before locking can be adjusted by a hoisting device, and by adjusting the locking position of the locking member on the hanger bar, the adjustment of the tension of the hanger bar and the structural displacement can be realized.

[0032] In another technical solution, the prefabricated construction support for the cast-in-place beam of the pier column in a complex environment further includes a plurality of distribution beams 81, which are arranged at intervals along the length direction of the bridge on the tops of the two cushion beams 2. Any one of the distribution beams 81 is arranged along the width direction of the bridge, and the cast-in-place beam formwork 82 is installed on the tops of the plurality of distribution beams 81.

[0033] Among them, the distribution beam 81 and the underlying cushion beam 2 form a crosswise and longitudinal staggered support structure, further improving the support stability of the construction support for the cast-in-place beam formwork. The distribution beam can be selected as an I-beam, and the formwork of the cast-in-place beam can adopt square timbers, bamboo plywood or steel formwork.

[0034] In another technical solution, for the prefabricated construction support for cast-in-place beams of pier columns in a complex environment, a plurality of batten plates 9 are arranged at intervals along the length direction on the top of the cushion beam 2. Specifically, the cushion beam can adopt an H-beam, an I-beam, a channel steel, etc., and the batten plates are welded on the top surface of the cushion beam at a set spacing for enhancing the integrity and structural stability of the cushion beam.

[0035] As Figure 2 shown, taking the transverse central axis of the construction support as the boundary, only the layout structure of the batten plate 9 is shown on the right side, and only the layout structure of the distribution beam 81 is shown on the left side. When the distribution beam and the batten plate are arranged simultaneously, the distribution beam can be fixed on the batten plate, or the distribution beam and the batten plate can be arranged in a dislocation along the length direction of the cushion beam.

[0036] The present invention also provides a construction method for the prefabricated construction support for cast-in-place beams of pier columns in a complex environment, including: S1. Open a transverse through hole 11 at the top of each pier column 1 and correspondingly thread the suspension bar 4; Among them, the transverse through hole 11 can be preset during the construction of the pier column 1, such as embedding a PVC pipe or a steel pipe at the top of the pier column. After the pier column is poured and completed, a hole for threading the suspension bar is naturally formed; S2. Install the corresponding steering device 3 on the cushion beam 2, and then hoist the two cushion beams 2 to both sides of the pier column 1 according to the designed positions; Among them, the steering device 3 and the cushion beam 2 can be pre-assembled before construction, and the remaining fixing components on the cushion beam can also be installed on the cushion beam in advance before hoisting, improving work efficiency and reducing the difficulty of suspended operation; S3. Respectively pass the two ends of each suspension bar 4 through the corresponding steering device 3 and then downward through the vertical through hole 22, and then anchor the suspension bar 4 at the bottom of the cushion beam 2 through the anchoring device 5 to form a support system; S4. Install the cast-in-place beam formwork 82 and its accessory structures with the two cushion beams 2 as the support foundation; among them, the accessory structures include accessory facilities such as walkways and railings; S6. Adjust the tension and structural displacement of the suspension bar 4 through the anchoring device 5 to make the support reach the set stress state; Among them, construction workers can analyze the stress condition of the support in advance according to the design parameters of the support and relevant construction parameters, and calculate the appropriate tension and position state of the suspension bar. During construction, by adjusting the relative position relationship between the cushion beam and the suspension bar according to the designed displacement, the support can reach the stress state (range) that meets the requirements; S7. Use the in-situ beam formwork 82 to complete the in-situ beam construction, and finally remove the construction support and repair the duct of the transverse through-hole 11.

[0037] Taking a specific bridge construction project as an example, the fabricated construction support for the pier column in-situ beam under complex environments includes: a cushion beam 2 (multiple standard sections 21, with connecting plates 23 provided at the ends of each standard section), a steering device 3 (including a steering bracket 31, a rotating shaft 32, and a limiting device), a tie rod 71, a bearing 72, a batten plate 8, a backing plate 51, a suspension bar 4 and its supporting anchoring device 5, a tensioning system 6 (tensioning blocks 61, tension bars 62, and a tensioning device 63), a distribution beam 81, and an in-situ beam formwork 82. Among them, each component adopts fabricated standard components to ensure the quality and precision of each component.

[0038] The construction method includes: S1. According to the on-site requirements, connect multiple standard sections 21 to form a cushion beam 2, and pre-weld the steering device 3, batten plate 9, backing plate 51, tensioning blocks 61, and bearing 72 on the cushion beam. S2. During the construction of the pier column 1, bury a PVC pipe at the top. After the pier column is formed, a reserved duct (transverse through-hole 11) is naturally formed. S3. Use a small hoisting device to hoist and assemble two cushion beams, making the cushion beam close to the side wall of the pier column, and align the transverse through-hole 11 on the pier column 1 with the corresponding vertical through-hole 22 on the cushion beam 2. S4. Pass the two ends of each suspension bar 4 through the corresponding steering device 3 respectively and then pass them downward through the vertical through-hole 22, and then anchor the suspension bar 4 to the bottom of the cushion beam 2 through the anchoring device 5 to form a support system. Here, the length of the suspension bar located above the cushion beam can be adjusted through the anchoring device to realize the real-time adjustment of the stress condition of the support. S5. Install the tie rod 71 between the cushion beams through the pin shaft 73, and install the tension bar 62 and the tensioning device 63 of the tensioning system by using the tensioning block 61 to form an adjustable prestressed support stress system. S6. Lay and install the distribution beam 81 on the cushion beam 2, and install the in-situ beam formwork 82 and auxiliary facilities such as walkways and railings on the distribution beam 81. S7. Precisely adjust the length of the suspension bar 4 by using the anchoring device 5, and cooperate with the limiting device in the steering device 3 to press the suspension bar 4 to further adjust the tension of the suspension bar and realize the fixation of the position of the cushion beam. Precisely adjust the tension of the tension bar 62 and the structural displacement by using the tensioning system 6 to make the stress of the support structure in the most suitable state (optimal stress state). Specifically, use the finite element analysis method to analyze the stress of the support structure, and calculate the tension data of the suspension bar and the tension bar in the optimal stress state of the support according to the control relationship between the suspension bar tension, the tension bar tension and the internal stress of the support. In actual construction, tension monitoring devices can be respectively arranged at the anchoring device and the tensioning device (such as installing a cable force meter on the hanging bar or the tension bar, or installing a pressure gauge at the nut) to monitor the real-time tension value, and respectively adjust the effective hoisting length of the hanging bar (the anchoring position of the anchoring device on the hanging bar) and the working state of the tensioning device, so that the real-time tension of the monitored hanging bar and tension bar is consistent with the tension data of the hanging bar and tension bar in the optimal stress state, and the support can reach the optimal stress state; S8. Preload the assembled construction support. After meeting the requirements of the corresponding specifications, remove the preload, tie the steel bars, and pour the concrete beam synchronously and symmetrically; S9. After the construction is completed, remove the construction support and grout and repair the transverse through hole 11; among them, when removing the construction support, first unload the anchoring device 5 and the tensioning system 6, and then, referring to the installation sequence, reverse the order to complete the disassembly of each component. On the ground, disassemble the cushion beam 2 into multiple standard sections 21 and transport them to a fixed place for storage for later turnover use.

[0039] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A pier column cast-in-place beam assembled construction support in a complex environment, characterized in that: A transverse through hole is provided on the top of each pier along the width direction of the bridge. The pier cast-in-place beam assembled construction support under the complex environment includes: Two cushion beams are arranged on both sides of the piers, one cushion beam is arranged along the length direction of the bridge and abuts against the side wall of each pier, and a plurality of vertical through holes are arranged on the cushion beam at intervals along the length direction, which correspond to the positions of the horizontal through holes on each pier; A plurality of steering devices, which are correspondingly arranged at the top openings of the vertical through holes and fixedly connected to the cushion beam; A plurality of hangers pass through the transverse through holes correspondingly, and two ends of any hanger are respectively turned by the turning device on the same side and then pass downward through the corresponding vertical through hole and are fixed to the bottom of the cushion beam through the anchoring device.

2. The assembled construction support for cast-in-place beams of pier columns in complex environments as claimed in claim 1, characterized in that: The cushion beam comprises a plurality of standard sections which are continuously arranged along the length direction of the bridge, and any two adjacent standard sections can be detachably connected.

3. The assembled construction support for cast-in-place beams of pier columns in complex environments as claimed in claim 2, characterized in that: It also includes a tensioning system, which includes two groups of tensioning blocks, which are arranged corresponding to the two cushion beams, and any group of tensioning blocks includes two tensioning blocks, which are relatively arranged at the two ends of the bottom of the corresponding cushion beam and fixedly connected thereto; two groups of tensioning bars, which are arranged corresponding to the two groups of tensioning blocks, and any group of tensioning bars includes two tensioning bars, which are arranged corresponding to the two tensioning blocks in the same group, and any tensioning bar passes through the corresponding tensioning block along the length direction of the cushion beam and is anchored on its end face away from the other tensioning block; two tensioning devices, which are arranged corresponding to the two groups of tensioning bars, and any tensioning device is connected to the corresponding two tensioning bars and is used to adjust their relative tensioning force.

4. The assembled construction support for cast-in-place beams of pier columns in complex environments as claimed in claim 1, characterized in that: The steering device includes two steering brackets, which are arranged at intervals on both sides of the corresponding vertical through holes along the length direction of the cushion beam; a rotating shaft, which connects the two steering brackets along the length direction of the cushion beam and is rotatably connected thereto, the top of the rotating shaft is flush with the bottom end of the horizontal through hole, and the side of the rotating shaft away from the horizontal through hole is flush with the side of the vertical through hole close to the horizontal through hole; a limiting device, which is configured to limit the displacement of the suspension rod on the rotating shaft.

5. The assembled construction support for cast-in-place beams of piers in complex environments as claimed in claim 1, characterized in that: It also includes a plurality of tie rods, which are arranged at intervals at the bottom of the cushion beam along the length direction thereof, and any tie rod is fixedly connected to the two cushion beams along the width direction of the bridge and relatively tightens them.

6. The assembled construction support for cast-in-place beams of pier columns in complex environments as claimed in claim 1, characterized in that: The anchoring device includes a pad, which is arranged at the bottom opening of the vertical through hole and fixedly connected to the pad beam, and the pad is provided with a vertical through hole connected to the vertical through hole; a locking piece, which is arranged at the bottom of the pad and is used to lock the bottom end of the corresponding suspension rod relative to the pad.

7. The assembled construction support for cast-in-place beams of piers in complex environments as claimed in claim 1, characterized in that: It also includes a plurality of distribution beams, which are erected on top of the two cushion beams at intervals along the length direction of the bridge, and any distribution beam is arranged along the width direction of the bridge, and cast-in-place beam templates are installed on top of the plurality of distribution beams.

8. The assembled construction support for cast-in-place beams of pier columns in complex environments as claimed in claim 1, characterized in that: A plurality of gusset plates are arranged at intervals on the top of the cushion beam along the length direction.

9. The construction method of the pier column cast-in-place beam assembled construction support under complex environment as claimed in claim 1, characterized in that: include: S1. Open transverse through holes at the top of each pier and insert corresponding hanger bars; S2. Install the corresponding steering device on the cushion beam, and then hoist the two cushion beams to both sides of the pier according to the designed position; S3, turning the two ends of each hanging bar through the corresponding turning device and passing it downward through the vertical through hole, and then anchoring the hanging bar at the bottom of the cushion beam through the anchoring device to form a support system; S4, using the two cushion beams as the supporting foundation to install the cast-in-place beam formwork and its accessory structures; S6. Adjusting the tension and structural displacement of the suspension bar through the anchoring device so that the bracket reaches a set stress state; S7, using the cast-in-place beam template to complete the cast-in-place beam construction, and finally removing the construction support and repairing the transverse through hole.

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