CN115369748B - Formwork system construction method for integrated casting of bridge piers and tie beams - Google Patents

Abstract

The invention relates to the technical field of bridge pier column construction, and particularly discloses a template system construction method for integrally pouring a pier and a tie beam, wherein S1 and pier column construction are carried out; s2, embedding a bearing upright post: when the pier column of the section before the tie beam is poured is constructed, at least two vertical bearing upright columns are embedded, and the top of each bearing upright column can be propped against and fixed with the bottom of the transverse cantilever beam of the climbing frame; s3, dismantling opposite pier side dies on the pier column and fixedly connecting upright columns on the climbing frame; s4, installing a tie beam bracket: the tie beam support is assembled into a whole on the ground, then is hoisted beside the connecting upright post, and the connecting upright post is fixedly connected with four corner positions of the tie beam support; s5, splicing the bridge pier and the tie beam templates into a whole: fixedly connecting a tie beam side die with a bridge pier side die; s6, placing steel bars in the pier-tie beam integrated template and pouring. The scheme is used for solving the problems that bridge pier appearance damage and high construction danger exist in bridge construction by constructing a bridge construction platform through a penetrating rod in the prior art.

Description

Formwork system construction method for integrated casting of bridge piers and tie beams

Technical Field

The invention relates to the technical field of bridge pier construction, and in particular to a formwork system construction method for integrated casting of bridge piers and tie beams.

Background technique

The more mature technologies for high pier construction mainly include climbing formwork, sliding formwork and flip formwork. Climbing formwork is the abbreviation of climbing formwork. It consists of three parts: climbing formwork, climbing frame (some climbing formworks do not have climbing frame) and climbing equipment. Climbing formwork construction has high requirements for the initial setting control of concrete, and embedded parts are easy to damage the newly poured concrete. Slip formwork not only includes ordinary or special tool formwork, but also includes comprehensive technologies such as power sliding equipment and supporting construction technology. It mainly uses hydraulic jacking equipment as the sliding power. Under the synchronous action of group jacking equipment, it drives the climbing system and the tool formwork more than one meter high to climb along the climbing pole installed in the pier column. During the climbing process, the formwork slides along the newly formed concrete surface. Slip formwork construction has high requirements for concrete and difficult to control the appearance. Flip formwork refers to the tripod flip formwork construction process, which has evolved from the traditional sliding formwork and is now widely used in the construction of high bridge piers.

In the construction of high or super-high bridge piers, in order to improve the stress structure of the pier column, it is often necessary to set a tie beam that acts as a pull rod between two or three pier columns. The tie beam can connect the adjacent pier columns to bear the stress as a whole, so that the overall rigidity of the pier column is strengthened. The conventional construction method of the tie beam is to cast the pier column first, and after the pier column construction is completed, a tie beam construction platform is set up between the two pier columns for tie beam construction. For the case of a low tie beam height, a full-height bracket can be erected as a support system for tie beam construction; for the case that is not suitable for erecting a full-height bracket, there is a method of pre-embedded through-bars in the prior art, specifically, PVC pipes are first embedded at the same height of the two piers where the tie beams need to be processed, and after the strength of the two piers reaches the requirement, the workers are lifted up and the manual work is done to insert through-bars into the PVC pipes of each pier, and then jacking equipment is installed above the two ends of the through-bars extending out of the piers, and then the jacking equipment on the through-bars supports two large support beams, and then multiple distribution beams are laid flat between the two large support beams, and the tie beam templates (the distribution beams and the support beams form the tie beam bracket) are supported by the distribution beams; this construction method has no construction platform when the through-bars are installed, and there is also no construction platform when the through-bars are removed, so it is relatively dangerous.

Summary of the invention

The present invention aims to provide a formwork system construction method for the integrated casting of bridge piers and tie beams, so as to solve the problems in the prior art of using through rods to build a tie beam construction platform for tie beam construction, resulting in damage to the appearance of the bridge piers and high construction risks.

In order to achieve the above object, the present invention adopts the following technical scheme:

The formwork system construction method for the integrated casting of piers and tie beams requires the use of pier formwork, climbing system, tie beam bracket and tie beam formwork. The pier formwork includes a plurality of detachably connected pier side forms, and all the pier side forms can be connected to form a pier column of the pier; the climbing system includes a jacking device, a climbing frame, a ring beam and an operating platform. The jacking device is connected to the climbing frame, and the jacking device drives the climbing frame to climb. The ring beam is fixed on the climbing frame, and the operating platform is fixed on the ring beam; the tie beam formwork includes a tie beam bottom formwork and tie beam side forms located on both sides of the bottom formwork; and the following construction steps are also included:

S1. Pier construction: During the construction of the bottom section of the pier, the climbing pole is installed in the pier. Later, the climbing pole is raised section by section as the pier rises. The jacking equipment is installed on the climbing pole. The climbing frame is driven by the jacking equipment to climb along the climbing pole. Before each climbing, the side form of the pier is separated from the cast pier. After the climbing system completes the climbing, the side form of the pier is abutted against the pier to form a complete pier formwork for casting.

S2. Pre-embedded load-bearing columns: When constructing the pier column of the previous section of the tie beam, at least two vertical load-bearing columns are pre-embedded. The climbing frame includes a plurality of horizontal beams, which are arranged horizontally and vertically in a well shape. The top of the load-bearing column can be abutted against and fixedly connected to the bottom of at least one horizontal beam on the climbing frame.

S3, remove the side formwork of the pier on the pier column and fix the connecting column on the climbing frame, the connecting column is located on the outer side of the pier;

S4. Install the tie beam bracket: The tie beam bracket is assembled into a whole on the ground, and then hoisted to the side of the connecting column. A person can stand on the operating platform to fix the connecting column and the four corners of the tie beam bracket;

S5. Assemble the pier-tie beam formwork into one piece: hoist the assembled tie beam formwork and place it on the tie beam bracket, with the tie beam side formwork parallel to the bridge body, and the two ends of the tie beam side formwork fixedly connected to the adjacent pier side formwork to form an integrated formwork containing the pier and tie beam;

S6. Place and cast steel bars in the integrated pier-tie beam formwork.

The principle and advantage of this scheme are: in actual application, when the tie beam is cast, the load-bearing column can be pre-buried on the operating platform when it is installed. As long as the load-bearing column meets the strength requirements, the load-bearing column can be raised so that the top of the load-bearing column is against the bottom of the horizontal beam, and then the load-bearing column is fixed to the horizontal beam so that the load-bearing column supports the horizontal beam. The tie beam bracket is then suspended and supported by the climbing frame and the connecting column, so as to facilitate the support of the tie beam template and the tie beam during the construction process by the tie beam bracket; and when the connecting column is connected to the climbing frame, the person can stand on the well-shaped climbing frame or the operating platform to install the connecting column, and the person can also stand on the operating platform to fix the connecting column with the four corners of the tie beam bracket; it can be seen that the entire construction process of the load-bearing column, the connecting column and the fixed connection with the tie beam bracket adopted to realize the support of the tie beam template is supported by the operating platform or the well-shaped climbing frame, and there is no danger of construction due to the lack of an operating platform caused by the through-rod construction method in the prior art. In addition, after the tie beam construction is completed, only the tie beam template, tie beam bracket and connecting column need to be removed. The load-bearing column only needs to be removed from the cross beam and remain on the pier column. There is no need to dismantle the load-bearing column, which reduces the labor operation cost. At the same time, the load-bearing column is built into the pier column, which is conducive to improving the strength of the pier column. At the same time, the pier template and the tie beam template are connected into one to facilitate the integrated construction of the pier column and the tie beam, and improve the strength of the pier formed by the tie beam and the pier column.

In addition, in this scheme, the over-molding method (i.e., the method of separating the pier formwork from the pier column surface) and the slip-molding method (the method of climbing using jacking equipment and climbing frames) of high pier construction are combined, so that during the entire pier column construction, the pier side formwork is only attached to the pier column when pouring the pier column and will not slide along the pier column surface, thus ensuring the appearance of the pier column after the pier column is formed. At the same time, this scheme does not need to prefabricate horizontal PVC pipes like the construction method of through-rods, and will not cause damage to the appearance of the pier column. At the same time, the slip-molding method is used to drive the lifting and lowering of the entire climbing system to reduce the problem of frequent disassembly and assembly of the operating platform during the existing over-molding, which is also conducive to reducing construction steps and shortening construction time.

In addition, in this scheme, load-bearing columns capable of bearing weight are pre-embedded on the piers of the previous section of the tie beam construction. The load-bearing columns support the cross beams on the climbing frame. When the piers and tie beams are constructed in an integrated manner, the weight of the tie beams is shared by the load-bearing columns and also shared by the various jacking devices connected to the climbing frame through the cross beams, and acts on the corresponding climbing poles through the jacking devices. This is equivalent to the weight borne by the tie beam construction being supported by the load-bearing columns and multiple climbing poles at the same time, ensuring the safety of the integrated construction of the tie beams and piers.

Preferably, as an improvement, the pier side formwork is connected to the climbing frame via a movable device, and the movable device drives the pier side formwork to move away from or closer to the pier column surface.

Beneficial effect: Through the setting of the mover, this scheme makes it possible that during the pier casting process, the pier side formwork detached from the pier surface does not need to be hoisted to the ground, but only needs to be hung at a place not in contact with the pier to facilitate the climbing of the climbing system. After the climbing is completed, the mover is used to press the pier side formwork close to the pier, so that multiple pier side forms are enclosed into a complete pier formwork, making the construction operation of the entire pier column simpler and faster, which is conducive to shortening the time consumed for pier construction.

Preferably, as an improvement, the pier side formwork further includes a steel plate and back ribs, the back ribs include horizontal back ribs and vertical back ribs, and the horizontal back ribs and the vertical back ribs are both fixedly connected to the steel plate.

Beneficial effect: By arranging horizontal back ribs and vertical back ribs on the side formwork of the pier, the strength and rigidity of the side formwork of the pier can be increased, the lateral pressure generated during the construction and pouring process can be resisted, and the construction safety and quality can be ensured.

Preferably, as an improvement, a clamping rod capable of adjusting its length is rotatably connected to the climbing frame, and the other end of the clamping rod is rotatably connected to the side form of the pier.

Beneficial effect: The design of the clamping rod with adjustable length in this scheme can facilitate the mover to drive the pier side form to the target position, and then use the clamping rod with adjustable length to clamp the pier side form to the pier column, thereby improving the fit between the pier side form and the pier column and reducing the probability of mud leakage during the pier column pouring process.

Preferably, as an improvement, the tie beam formwork also includes a tie beam end formwork, which is fixedly connected to the ends of the tie beam side formwork and the tie beam bottom formwork at the same time, and the tie beam end formwork extends outward from the tie beam bottom formwork, and the tie beam end formwork can be attached to the pier column, and the tie beam end formwork can be detachably connected to the pier side formwork.

Beneficial effects: This solution allows the tie beam formwork to be assembled on the ground through the setting of the tie beam end formwork, which can be hoisted to the construction height after assembly. The tie beam end formwork on the tie beam formwork facilitates the rapid alignment of the tie beam formwork with the pier column, and also facilitates the rapid docking and installation of the tie beam formwork with the pier side formwork, which is beneficial to saving the installation and disassembly time of the pier-tie beam integrated formwork.

In addition, the arrangement of the tie beam end formwork extending to the outside of the tie beam enables the tie beam bottom formwork between the tie beam end formworks at both ends of the tie beam formwork to be supported by the tie beam bracket, providing support space for the tie beam bracket to support the tie beam formwork.

Preferably, as an improvement, the tie beam bracket includes two supporting beams and multiple distribution beams, the multiple distribution beams are fixed above the two supporting beams, the tie beam template can be placed on the distribution beams, and the supporting beams are fixedly connected to the connecting columns.

Beneficial effect: The tie beam bracket can be assembled on the ground and then hoisted as a whole after the assembly is completed, which is convenient for the rapid installation of the tie beam bracket.

Preferably, as an improvement, the ring beam comprises a plurality of sub-ring beams, adjacent sub-ring beams are detachably connected to each other, and all the sub-ring beams are connected to enclose the pier.

Beneficial effect: Through the structural improvement of the ring beam, this scheme makes the ring beam either a whole composed of all sub-ring beams or a single sub-ring beam that is easy to disassemble and assemble with other sub-ring beams, thereby reducing the requirements for lifting equipment during the installation of the ring beam (for example, the requirements for lifting equipment are lower when lifting a single ring beam).

Preferably, as an improvement, the operating platform includes a construction operating platform and a formwork installation and removal operating platform, the construction operating platform is located above the ring beam, the formwork installation and removal operating platform is located below the ring beam, the formwork installation and removal operating platform includes a detachable sub-platform and a fixed sub-platform, the detachable sub-platform is detachably connected to the fixed sub-platform and the ring beam, the fixed sub-platform is fixedly connected to the ring beam, and the detachable sub-platform is parallel to the longitudinal direction of the bridge body; the top of the pier formwork is lower than the bottom of the ring beam during casting.

Beneficial effects: This solution enables construction to be carried out on the construction operation platform through specific limitations on the operating platform. When it is necessary to dismantle the pier side formwork, it can be done while standing on the formwork installation and disassembly operation platform, making it convenient for manual labor to directly dismantle the pier side formwork that needs to be dismantled without the aid of lifting equipment. In addition, before installing the tie beam bracket, the formwork installation and disassembly operation platform can be used to first fix the connecting column and the climbing frame, and then the detachable sub-platform can be removed to make room for the connection between the tie beam formwork and the pier formwork. At the same time, workers can also stand on the fixed sub-platform to fix and install the tie beam bracket and the connecting column, ensuring that there is a platform to stand on during the construction process.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a pier formwork structure according to an embodiment of the present invention.

FIG2 is a schematic diagram of the structure of the pier formwork after one of the pier side forms is removed according to an embodiment of the present invention.

FIG3 is a schematic structural diagram of a climbing system according to an embodiment of the present invention without an operating platform.

FIG. 4 is a schematic diagram of the structure after one of the sub-ring beams in FIG. 3 is disassembled.

5 is a schematic diagram of a cross-section of the pier body in the longitudinal direction of the bridge when the pier column is cast, according to an embodiment of the present invention.

FIG. 6 is a top view of the structure of the template installation and removal operation platform in an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of the abutting rod in FIG. 5 .

FIG8 is a schematic structural diagram of a tie beam template in an embodiment of the present invention.

FIG. 9 is a schematic structural diagram of an embodiment of the present invention corresponding to step S1 when the operating platform is hidden.

FIG. 10 is a schematic top view of the template installation and removal operation platform and the pier columns and pier templates in step S1 according to an embodiment of the present invention.

FIG. 11 is a schematic structural diagram of an embodiment of the present invention corresponding to step S2 when the operating platform is hidden.

FIG. 12 is a schematic diagram of the structure of an embodiment of the present invention corresponding to step S3 when the operating platform is hidden.

FIG. 13 is a schematic structural diagram of an embodiment of the present invention corresponding to step S4 when the operating platform and part of the sub-ring beam are hidden.

FIG. 14 is a schematic structural diagram of an embodiment of the present invention corresponding to step S5 when the operating platform and part of the sub-ring beam are hidden.

15 is a schematic top view of the template installation and removal operation platform and the pier column, pier template, and tie beam template in step S5 according to an embodiment of the present invention.

Detailed ways

The following is further described in detail through specific implementation methods:

The figure marks in the drawings of the specification include: pier formwork 10, pier side formwork 1, steel plate 11, back rib 12, pull rod 13, climbing system 20, climbing frame 21, horizontal cantilever beam 211, diagonal brace 212, vertical beam 213, tightening rod 214, screw rod 2141, installation sleeve 2142, ring beam 22, jack 23, construction operation platform 24, formwork installation and disassembly operation platform 25, upper platform 251, lower platform 252, support beam 31, distribution beam 32, tie beam formwork 40, tie beam side formwork 41, tie beam bottom formwork 42, tie beam end formwork 43, climbing pole 50, load-bearing column 60, connecting column 70, pier column 100.

The embodiments are basically as shown in Figures 1 to 15:

The formwork system construction method for the integrated casting of piers and tie beams requires a pier formwork 10, a climbing system 20, a tie beam bracket and a tie beam formwork 40. In conjunction with Figures 1 and 2, the pier formwork 10 includes a plurality of detachably connected pier side forms 1, and all the pier side forms 1 can be connected to enclose a pier column 100 of the pier; the pier side formwork 1 also includes a steel plate 11 and a back rib 12, and the back rib 12 includes a horizontal back rib 12 and a vertical back rib 12, and the horizontal back rib 12 and the vertical back rib 12 are both fixedly connected to the steel plate 11; after the opposite pier side forms 1 enclose the pier column 100, the connection strength between the opposite pier side forms 1 can be enhanced by installing tie rods 13 on the opposite pier side forms 1.

In conjunction with Figures 3 to 7, the climbing system 20 includes a jacking device, a climbing frame 21, a ring beam 22 and an operating platform. The jacking device is connected to the climbing frame 21, and the jacking device drives the climbing frame 21 to climb (in this embodiment, the jacking device adopts a jack 23 with a hydraulic pump). In conjunction with Figures 3 and 4, the ring beam 22 is fixed on the climbing frame 21, and the operating platform is fixed on the ring beam 22; in order to enhance the strength between the components during the construction stage, the two components connected by bolts can be welded with a reinforcement plate to form a temporary fixed connection. When removal is required, the reinforcement plate can be cut and removed.

Specifically, the climbing frame 21 includes a plurality of transverse beams 211 , which are arranged horizontally and vertically in a well shape, and adjacent transverse beams 211 are welded. The ring beam 22 includes a plurality of sub-ring beams 22, and adjacent sub-ring beams 22 are connected by bolts. After all the sub-ring beams 22 are connected, the pier 100 is enclosed. All the sub-ring beams 22 are connected to the climbing frame 21 (the climbing frame 21 is welded with diagonal braces 212 and vertical beams 213, the diagonal braces 212 and the vertical beams 213 form a triangle, and the diagonal braces 212 and the vertical beams 213 are fixedly connected to the sub-ring beams 22); in combination with Figures 5 and 6, the operating platform includes a construction operating platform 24 and a template installation and disassembly operating platform 25, the construction operating platform 24 is fixed above the ring beam 22, the template installation and disassembly operating platform 25 is located below the ring beam 22, the template installation and disassembly operating platform 25 includes a detachable sub-platform and a fixed sub-platform, the detachable sub-platform is connected to the fixed sub-platform and the ring beam 22 by bolts, the fixed sub-platform is fixedly connected to the ring beam 22, and the detachable sub-platform is parallel to the longitudinal direction of the bridge body; the top of the pier template 10 is lower than the bottom of the ring beam 22 during casting. In order to facilitate the repair of the surface of the pier 100 after construction, the template installation and disassembly operation platform 25 can be made into a double-layer structure (upper platform 251 and lower platform 252), and the upper and lower structures are exactly the same, as shown in Figure 5, to facilitate the work of the staff. At the same time, because the lower platform 252 can be designed to be lower than the position of the pier side formwork 1, it is convenient for workers to repair the surface of the pier 100 on the template installation and disassembly operation platform 25.

5 and 7 , a clamping rod 214 capable of adjusting its length is rotatably connected to the climbing frame 21 , and the other end of the clamping rod 214 is rotatably connected to the pier side mold 1 . The clamping rod 214 includes a screw rod 2141 and mounting sleeves 2142 installed at both ends of the screw rod 2141. The screw rod 2141 is processed with two threaded sections with opposite spiral rotation directions. The two mounting sleeves 2142 are respectively threadedly connected to the two different threaded sections. One of the two mounting sleeves 2142 is rotatably connected to the climbing frame 21, and the other can be rotatably connected to the pier side form 1; a radial through hole is processed between the two threaded sections to facilitate workers to insert the force rod into the through hole, and then rotate the screw rod 2141. After the screw rod 2141 rotates, the two mounting sleeves 2142 approach each other to shorten the clamping rod 214 or the two mounting sleeves 2142 move away from each other to lengthen the clamping rod 214; the gap between the pier side form 1 and the pier column 100 is made smaller by extending the clamping rod 214, thereby improving the side compressive resistance of the pier side form 1.

The pier side formwork 1 is connected to the climbing frame 21 through a provided mover, and the mover drives the pier side formwork 1 away from or close to the surface of the pier column 100. After the mover drives the pier side formwork 1 away from the pier column 100, the pier formwork 10 is separated from the pier column 100. In this embodiment, the mover can be a moving trolley (not shown in the figure), the moving trolley is fixed on the climbing frame 21, and the pier side formwork 1 is fixed at the output end of the moving trolley. Before the pier side formwork 1 on the pier column 100 needs to be removed, the connection between the clamping rod 214 and the pier side formwork 1 needs to be released first, and then the pier side formwork 1 is driven away from the pier column 100 by the moving trolley.

The tie beam bracket includes two support beams 31 and a plurality of distribution beams 32 , and the plurality of distribution beams 32 are fixed above the two support beams 31 .

8 , the tie beam formwork 40 includes a tie beam bottom formwork 42, tie beam side forms 41 located on both sides of the bottom formwork, and a tie beam end formwork 43 fixedly connected to the ends of the tie beam side formwork 41 and the tie beam bottom formwork 42. The tie beam end formwork 43 extends outward from the tie beam bottom formwork 42. The tie beam end formwork 43 can be attached to the pier column 100, and the tie beam end formwork 43 can be connected to the pier side formwork 1 by bolts. The following construction steps are also included:

S1. Construction of pier 100: During the construction of the bottom section pier 100, the climbing rod 50 is installed in the pier 100. Later, the climbing rod 50 is raised section by section as the pier 100 rises. The jacking equipment is installed on the climbing rod 50. The climbing frame 21 is driven by the jacking equipment to climb along the climbing rod 50. Before each climbing, the installation sleeve 2142 of the clamping rod 214 is first removed from the pier side form 1, and the pull rod 13 between the relative pier side form 1 is removed. Then, the mobile trolley is started to drive the pier side form to separate from the poured pier 100. After the climbing system 20 completes the climbing, the mobile trolley is started again to make the mobile trolley abut the pier side form 1 against the pier 100. Then, the pull rod 13 and the clamping rod 214 are installed to tighten the pier side form 1 and form a complete pier formwork 10 for pouring. FIG9 shows an example of the construction of a pier with three pier columns 100 in this embodiment (the operating platform in the drawing is hidden for ease of understanding), and FIG10 is a top view of the template installation and removal operating platform 25, the pier columns 100, and the pier template 10 when the three pier columns 100 are under construction.

S2. Pre-embedded load-bearing columns 60: When constructing the pier 100 of a section before casting the tie beam, at least two vertical load-bearing columns 60 are pre-embedded (as shown in FIG. 11 ). The top of the load-bearing column 60 can abut against and be fixedly connected to the bottom of at least one transverse beam 211 on the climbing frame 21. In this embodiment, the transverse beam 211 abutting against the load-bearing column 60 is parallel to the longitudinal direction of the bridge body. In this embodiment, the load-bearing column 60 is made of I-beam, and the transverse beam 211 is made of double-jointed channel steel.

S3. Remove the pier side formwork 1 on the pier 100, and remove the detachable sub-platform on the opposite side of the pier 100 on the formwork installation and disassembly operation platform 25 to make room for the subsequent installation of the tie beam bracket, and add guardrails at the ends of the fixed sub-platform to ensure safety; then fix connecting columns 70 at both ends of the cross beam 211 connected to the load-bearing column 60, and the connecting columns 70 are located on the outside of the pier. In this embodiment, the connecting columns 70 are made of I-beams, as shown in Figure 12.

After the pier side formwork 1 that needs to be dismantled is dismantled, connecting columns 70 are fixed at both ends of the transverse cantilever beam 211 parallel to the longitudinal direction of the bridge body, and the connecting columns 70 are suspended and fixed on the transverse cantilever beam 211. This operation can be completed manually standing on the construction operation platform 24.

S4. Install the tie beam bracket: hoist the tie beam bracket that has been assembled into an integral whole on the ground to the side of the connecting column 70, and a person can stand on the fixed platform of the template installation and disassembly operation platform 25 to fix the connecting column 70 with the ends of the two support beams 31 of the tie beam bracket, so that the connecting column 70 hangs the tie beam bracket from the four corners of the tie beam bracket, as shown in Figure 13 (for ease of understanding, the operating platform is hidden from the drawing and the sub-ring beam 22 on the opposite side of the pier 100 is hidden).

S5. Assemble the pier-tie beam template 40 into one piece: hoist the assembled tie beam template 40 and place it on the tie beam support, so that the tie beam side form 41 is parallel to the bridge body in the horizontal direction, the tie beam end form 43 at both ends are respectively attached to the opposite surfaces of the two piers 100 and fixedly connected to the adjacent pier side form 1 on the pier 100, and the tie beam bottom form 42 is placed on the distribution beam 32 of the tie beam support to form an integrated template containing the pier and the tie beam, that is, change from Figure 13 to Figure 14. Before the tie beam is cast, the template installation and removal operation platform 25 and the pier 100, the pier template 10 and the tie beam template 40 are shown in Figure 15.

S6. Place and cast steel bars in the integrated pier-tie beam formwork.

When the present construction method is used to construct the tie beam of the bridge pier, the load-bearing column 60 can be pre-buried on the construction operation platform 24 during installation. As long as the load-bearing column 60 meets the strength requirements, the load-bearing column 60 can be raised so that the top of the load-bearing column 60 is against the bottom of the horizontal beam 211, and then the load-bearing column 60 and the horizontal beam 211 are fixed so that the load-bearing column 60 supports the horizontal beam 211; and then the tie beam bracket is suspended and supported by the horizontal beam 211 and the connecting column 70, so as to facilitate the support of the tie beam formwork 40 by the tie beam bracket and the construction process. The tie beam in the middle is supported; when the connecting column 70 is connected to the climbing frame 21, a person can stand on the well-shaped climbing frame 21 or the construction operation platform 24 to install the connecting column 70, and a person can stand on the template installation and disassembly operation platform 25 to fix the connecting column 70 with the support beam 31 of the tie beam bracket; it can be seen that the entire construction process of the load-bearing column 60, the connecting column 70 and the fixed connection with the tie beam bracket adopted to support the tie beam template 40 is supported by the operation platform or the well-shaped climbing frame 21, which ensures the safety of the construction. In addition, after the tie beam construction is completed, it is only necessary to remove the tie beam template 40, the tie beam bracket and the connecting column 70. The load-bearing column 60 only needs to remove the connection with the cross beam 211 and continue to stay on the pier 100. There is no need to disassemble the load-bearing column 60, which reduces the labor operation cost. At the same time, the load-bearing column 60 is built into the pier 100, which is conducive to improving the strength of the pier 100. At the same time, the pier formwork 10 and the tie beam formwork 40 are connected as one body to facilitate the integrated construction of the pier column 100 and the tie beam, thereby improving the strength of the pier formed by the tie beam and the pier column 100 as a whole.

In addition, in this embodiment, the over-molding method (i.e., the method of separating the pier formwork 10 from the surface of the pier column 100) and the sliding formwork method (the method of climbing using jacking equipment and climbing frame 21) of high pier construction are combined, so that during the construction of the entire pier column 100, the pier side formwork 1 is only attached to the pier column 100 when pouring the pier column 100 and will not slide along the surface of the pier column 100, thereby ensuring the appearance of the pier column 100 after the pier is formed. At the same time, the sliding formwork method is used to drive the lifting of the entire climbing system 20 to reduce the problem of frequent disassembly and assembly of the operating platform during the existing over-molding, which is also conducive to reducing construction steps and shortening construction time.

In addition, in the present embodiment, a load-bearing column 60 capable of bearing weight is pre-embedded on the pier 100 of the previous segment of the tie beam construction, and the load-bearing column 60 lifts up the cross beam 211 on the climbing frame 21. When the piers and the tie beams are constructed in an integrated manner, the weight of the tie beam is shared by the load-bearing column 60 and is also shared by various lifting devices connected to the climbing frame 21 through the cross beam 211, and acts on the corresponding climbing poles 50 through the lifting devices. This is equivalent to the weight borne by the tie beam construction being supported by the load-bearing column 60 and multiple climbing poles 50 at the same time, ensuring the safety of the integrated construction of the tie beam and the piers.

The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and/or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims (7)

1. A formwork system construction method for integrally casting piers and tie beams, characterized in that a pier formwork, a climbing system, a tie beam support and a tie beam formwork are required, the pier formwork comprises a plurality of detachably connected pier side forms, all of which can be connected to enclose a pier column of the pier; the climbing system comprises a jacking device, a climbing frame, a ring beam and an operating platform, the jacking device is connected to the climbing frame, the jacking device drives the climbing frame to climb, the ring beam is fixed on the climbing frame, and the operating platform is fixed on the ring beam; the tie beam formwork comprises a tie beam bottom formwork and tie beam side forms located on both sides of the bottom formwork; the operating platform comprises a construction operating platform and a formwork installation and removal operating platform, the construction operating platform is located above the ring beam, the formwork installation and removal operating platform is located below the ring beam, the formwork installation and removal operating platform comprises a detachable sub-platform and a fixed sub-platform, the detachable sub-platform is detachably connected to the fixed sub-platform and the ring beam, the fixed sub-platform is fixedly connected to the ring beam, and the detachable sub-platform is parallel to the longitudinal direction of the bridge body; the top of the pier formwork is lower than the bottom of the ring beam during casting; and the following construction steps are also included: S1. Pier construction: During the construction of the bottom section of the pier, the climbing pole is installed in the pier. Later, the climbing pole is raised section by section as the pier rises. The jacking equipment is installed on the climbing pole. The climbing frame is driven by the jacking equipment to climb along the climbing pole. Before each climbing, the side form of the pier is separated from the cast pier. After the climbing system completes the climbing, the side form of the pier is abutted against the pier to form a complete pier formwork for casting. S2. Pre-embedded load-bearing columns: When constructing the pier column of the previous section of the tie beam, at least two vertical load-bearing columns are pre-embedded. The climbing frame includes a plurality of horizontal beams, which are arranged horizontally and vertically in a well shape. The top of the load-bearing column can be abutted against and fixedly connected to the bottom of at least one horizontal beam on the climbing frame. S3, remove the side formwork of the pier on the pier column and fix the connecting column on the climbing frame, the connecting column is located on the outer side of the pier; S4. Install the tie beam bracket: The tie beam bracket is assembled into a whole on the ground, and then hoisted to the side of the connecting column. A person can stand on the operating platform to fix the connecting column and the four corners of the tie beam bracket; S5. Assemble the pier-tie beam formwork into one piece: hoist the assembled tie beam formwork and place it on the tie beam bracket, with the tie beam side formwork parallel to the bridge body, and the two ends of the tie beam side formwork fixedly connected to the adjacent pier side formwork to form an integrated formwork containing the pier and tie beam; S6. Place and cast steel bars in the integrated pier-tie beam formwork. 2. The formwork system construction method for integrated casting of bridge piers and tie beams according to claim 1 is characterized in that the side formwork of the bridge pier is connected to the climbing frame through a movable device, and the movable device drives the side formwork of the bridge pier to move away from or close to the surface of the pier column. 3. According to the formwork system construction method for integrated casting of piers and tie beams as described in claim 2, it is characterized in that the pier side formwork also includes a steel plate and back ribs, the back ribs include horizontal back ribs and vertical back ribs, and the horizontal back ribs and the vertical back ribs are both fixedly connected to the steel plate. 4. The formwork system construction method for integrated casting of bridge piers and tie beams according to claim 3 is characterized in that a clamping rod with adjustable length is rotatably connected to the climbing frame, and the other end of the clamping rod is rotatably connected to the side formwork of the pier. 5. The formwork system construction method for integrated casting of bridge piers and tie beams according to claim 1 is characterized in that the tie beam formwork also includes a tie beam end formwork, which is fixedly connected to the ends of the tie beam side formwork and the tie beam bottom formwork at the same time, and the tie beam end formwork extends outward from the tie beam bottom formwork, the tie beam end formwork can be attached to the pier column, and the tie beam end formwork can be detachably connected to the pier side formwork. 6. The formwork system construction method for integrated casting of piers and tie beams according to claim 5 is characterized in that the tie beam support includes two supporting beams and multiple distribution beams, the multiple distribution beams are fixed above the two supporting beams, the tie beam formwork can be placed on the distribution beams, and the supporting beams are fixedly connected to the connecting columns. 7. The formwork system construction method for integrated casting of bridge piers and tie beams according to claim 5 is characterized in that the ring beam includes a plurality of sub-ring beams, adjacent sub-ring beams are detachably connected, and all the sub-ring beams are connected to enclose the pier column.