A method for synchronous construction of a rotating bridge across a railway and an underpass under a pipe gallery in a complex urban environment

Abstract

The present invention is a synchronous construction method of a cross-railway swivel bridge and an underpass under a complex urban environment, and the specific steps are: preparation before construction; measurement and layout of pile foundations, support piles, and back piles, excavation of the foundation pit of the swivel bridge and the crown beam foundation pit of the jacking pit, construction of the lower swivel bridge and the crown beam and horizontal support of the jacking pit; installation of the swivel device and the first excavation of the jacking pit; construction of the upper swivel and piers; continued excavation of the jacking pit at the same time, excavation to the pit bottom elevation, leveling and pouring the pit bottom platform and constructing the back wall; installation of brackets and equipment; construction of main beams and pipe gallery; installation of a jacking device between the tail of the pipe gallery and the back wall, and construction of the swivel bridge swivel and the jacking construction of the pipe gallery; equipment removal and post-casting concrete construction. The present invention can effectively shorten the construction period, reduce costs, reduce the impact of construction on the railway, make full use of the vertical bearing capacity of the support piles, and save the foundation treatment engineering required for erecting full-hall brackets within the foundation pit.

Description

Technical Field

[0001] The invention relates to the technical field of municipal engineering construction, and in particular to a method for synchronously constructing a cross-railway rotating bridge and an underpass pipe gallery in a complex urban environment. Background Art

[0002] Municipal infrastructure construction projects usually include multiple professional fields, such as road engineering, bridge engineering, water supply and drainage engineering, power lines, communication lines, heating pipelines, etc., with the characteristics of multiple professions, heavy tasks, tight construction period, and great construction difficulty. Especially when it comes to railways, the construction is more complicated. Due to the particularity and importance of railways, the approval procedures for railway construction are complicated and the approval cycle is long. In addition, the safe operation of the railway system must be guaranteed during the construction process. Therefore, railway projects usually adopt unconventional construction methods. These factors increase the difficulty of railway construction and extend the construction period.

[0003] When railways are involved in municipal engineering, a rotating bridge is usually used to cross the railway, and a pipe gallery is used to solve the intersection of pipelines and railways. If the construction site is relatively open and the construction of the rotating bridge and the pipe gallery does not affect each other, the bridge and the pipe gallery can be constructed step by step. The rotating bridge is parallel to the railway and is rotated after being cast in place with a full-bridge bracket. The pipe gallery is poured on site after the foundation pit is excavated for jacking. However, due to the influence of various buildings and structures in the city, the construction site is limited. When the rotating bridge and the pipe gallery interfere with each other, the existing technology has the following shortcomings:

[0004] 1. During the construction of the rotating bridge, it is necessary to set up a support and cast it in place, which conflicts with the excavation of the foundation pit for the pipe gallery and cannot be constructed at the same time;

[0005] 2. Since the construction period of the rotating bridge and the pipeline corridor is relatively long, the construction period requirements cannot be met if the rotating bridge and the pipeline corridor cannot be constructed at the same time. Summary of the invention

[0006] The present invention aims to solve the deficiencies of the prior art and to provide a method for the synchronous construction of a cross-railway rotating bridge and an underpass pipe gallery in a complex urban environment, which can realize the synchronous construction of a cross-railway rotating bridge and an underpass pipe gallery in a complex urban environment, greatly shorten the construction period, and save project costs.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for synchronously constructing a rotating bridge across a railway and an underpass under a complex urban environment, the specific steps of which are:

[0009] S1. Preparation before construction:

[0010] Carry out road, water, electricity and site leveling;

[0011] S2. Construction of foundation and construction of pedestal, cap beam and horizontal support:

[0012] The foundation includes the pile foundation of the rotating bridge, the supporting piles and back piles of the jacking pit. The pile foundation, supporting piles and back piles are measured, laid out and constructed. The pile foundation is cast to the bottom elevation of the foundation pit of the rotating bridge, the supporting piles are cast to the bottom elevation of the crown beam, and the back piles are cast to the top elevation of the transfer platform.

[0013] After the foundation construction is completed, the foundation pit of the pedestal of the rotating bridge and the foundation pit of the crown beam of the jacking pit are excavated. The foundation pit of the pedestal is excavated to the bottom elevation of the lower pedestal, and the foundation pit of the crown beam is excavated to the bottom elevation of the crown beam. After the excavation is completed, the lower pedestal of the rotating bridge and the crown beam and horizontal support of the jacking pit are constructed. Before the construction, the embedded parts required for the rotating device and the hanging crane are installed in the corresponding positions. No supporting piles are set on the side of each jacking pit close to the existing railway, and a row of supporting piles are set on the remaining three sides. A crown beam is set on the top of the supporting piles, and a number of horizontal supports are set between the crown beams and only one layer is set;

[0014] S3. Installation of the rotating device and first excavation of the jacking pit:

[0015] Install the rotating device on the lower cap, and use the excavator to carry out the first excavation of the top-in pit. The first excavation is carried out to the transfer platform. After the excavation is completed, the pile head of the back pile is processed, and the transfer platform is cast after the pit bottom is leveled;

[0016] S4, construction of upper platform, piers and second excavation of jacking pit:

[0017] After the installation of the rotating device is completed, the upper bearing platform and piers of the rotating bridge are constructed in sequence; at the same time, the jacking pit is continued to be excavated to the pit bottom elevation, and after leveling, the pit bottom platform is cast and the back wall is constructed;

[0018] S5. Bracket and equipment installation:

[0019] First, install a suspended crane at the bottom of the horizontal support; second, install a pit top platform at the top of the crown beam; finally, harden or treat the ground, and set up a full-bridge support on the original ground and the pit top platform. The width of the full-bridge support is greater than the width of the bridge deck of the rotating bridge;

[0020] S6. Main beam and pipe gallery construction:

[0021] Pre-press the full-span support according to the design and specification requirements. After passing the supervisor's acceptance, set up the main beam template on the full-span support, tie up the main beam reinforcement, and cast the main beam. At the same time, set up the pipe gallery template on the pit bottom platform, tie up the pipe gallery reinforcement, and cast the pipe gallery.

[0022] S7. Construction of rotating bridge and jacking of pipe gallery:

[0023] Install a jacking device between the rear end of the pipe gallery and the back wall to carry out the rotation construction of the rotating bridge and the jacking construction of the pipe gallery;

[0024] S8, equipment dismantling and post-pour concrete construction;

[0025] The full-span support, pit top platform, suspended crane and jacking device were dismantled in sequence, and the gap between the upper and lower pedestals was filled with poured concrete in accordance with the design requirements to complete the construction of the cross-rail rotating bridge and the underlying pipe gallery.

[0026] In step S2, when the foundation pit of the swivel bridge is excavated, the excavation method is determined according to the buried depth of the swivel bridge and the geological survey report. When the conditions for slope excavation are not met, steel sheet piles are driven for excavation.

[0027] In step S2, the pile length and pile diameter of the supporting piles are determined based on the soil mechanics calculation of the foundation pit supporting soil and the structure of the rotating bridge and the deadweight of the support transmitted from the pit top platform to the top of the supporting piles; the cross-sectional size of the horizontal support is determined based on the axial soil reaction force transmitted to the horizontal support and the vertical concentrated force transmitted to the horizontal support by the suspended crane and the hoisting weight; the pile length and pile diameter of the back pile are determined based on the soil mechanics calculation of the foundation pit supporting soil and the jacking force during the jacking of the pipe gallery.

[0028] In step S3, the transfer platform is higher than the pit bottom platform, the height difference between the transfer platform and the pit bottom platform meets the height requirement of the back wall required for the jacking of the pipe gallery, and the height difference between the transfer platform and the suspension crane meets the hoisting clearance requirement required by the suspension crane.

[0029] In step S3, before the first excavation of the jacking pit, it is determined whether it is necessary to dewater the foundation pit and the form of dewatering according to the groundwater conditions. If the groundwater level is high, dewatering is required in advance to at least 0.5m below the bottom of the foundation pit.

[0030] In step S4, during the second excavation of the jacking pit, an excavator is first used to excavate to 0.3 m above the pit bottom, and the remaining part is excavated manually.

[0031] In step S5, the suspension crane includes two longitudinal tracks arranged symmetrically along the center line of the tunnel at the bottom of the horizontal support, longitudinal devices respectively arranged on the longitudinal tracks, a transverse track arranged at the bottom of the longitudinal device and perpendicular to the longitudinal device, and two sets of lifting devices arranged on the transverse track; the longitudinal track, the longitudinal device, the transverse track, and the lifting device are prefabricated in the factory in advance, and the longitudinal track is prefabricated in sections, and the total length of the longitudinal track should be greater than the distance between the tail end of the jacking pit and the front end of the tunnel; the prefabricated components of the suspension crane are transported to the site, and the longitudinal track is first connected and fixed to the embedded parts buried at the bottom of the horizontal support in sections, and then a set of longitudinal devices is installed on each longitudinal track, and then the transverse track is installed to the bottom of the two sets of longitudinal devices, and finally the two sets of lifting devices are installed on the transverse track and connected to other electrical equipment.

[0032] In step S5, the pit top platform includes several groups of longitudinal load-bearing beams arranged at the top of the crown beam and perpendicular to the axis of the pipeline corridor, and platform panels arranged on the load-bearing beams; the span of the load-bearing beams is greater than the distance between the axes of the supporting piles on both sides, the width of the pit top platform is greater than the width of the full-hall bracket and a safety range is reserved on both sides; the load-bearing beam determines the appropriate structural form according to the width and load of the jacking pit; the platform panel adopts a prefabricated structure welded with steel sections and steel plates, which is prefabricated in the factory in blocks, transported to the site, and hoisted to the load-bearing beam for connection and fixation.

[0033] In step S6, during the construction of the tunnel, first use a lifting machinery to lift the tunnel formwork, tunnel steel bars and construction machinery and equipment onto the transfer platform, then the suspended crane moves longitudinally along the longitudinal track to above the transfer platform, lifts the tunnel formwork, tunnel steel bars and construction machinery and equipment and transports them to the corresponding position along the longitudinal track for installation; the tunnel steel bar binding, tunnel formwork installation and concrete pouring are all carried out step by step from the end of the tunnel adjacent to the existing railway to the tail end.

[0034] In step S7, meteorological conditions that meet the requirements of rotation and jacking construction are selected, and an application is made to the railway department for a construction window period to carry out rotation construction of the rotating bridge and jacking construction of the pipeline corridor; during the rotation and jacking process, the relevant parameters of the existing railway and other buildings and structures within the affected area are monitored throughout the process in accordance with the design and specification requirements.

[0035] The beneficial effects of the present invention are as follows: the present invention can realize the synchronous construction of the cross-railway rotating bridge and the underpass pipeline corridor in a complex urban environment, which can effectively shorten the construction period, reduce costs, reduce the impact of construction on the railway, make full use of the vertical bearing capacity of the support piles, and save the foundation treatment engineering required for the erection of full-height brackets within the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic plan view of a method for synchronously constructing a rotating bridge across a railway and an underpass under a pipe gallery in a complex urban environment according to the present invention;

[0037] Figure 2 It is a schematic elevation view of the rotating bridge direction in step S2 of the construction method of the present invention;

[0038] Figure 3 It is a schematic elevation view of the pipe gallery direction in step S2 of the construction method of the present invention;

[0039] Figure 4 It is a schematic elevation view of the rotating bridge direction in step S3 of the construction method of the present invention;

[0040] Figure 5 It is a schematic elevation view of the pipe gallery direction in step S3 of the construction method of the present invention;

[0041] Figure 6 It is a schematic elevation view of the rotating bridge direction in step S4 of the construction method of the present invention;

[0042] Figure 7 It is a schematic elevation view of the pipe gallery direction in step S4 of the construction method of the present invention;

[0043] Figure 8 It is a schematic elevation view of the rotating bridge direction in step S5 of the construction method of the present invention;

[0044] Fig. 9 It is a schematic elevation view of the pipe gallery direction in step S5 of the construction method of the present invention;

[0045] Fig.10 It is a schematic elevation view of the direction of the rotating bridge in step S6 and step S7 of the construction method of the present invention;

[0046] Fig.11 It is a schematic elevation view of the pipe gallery direction in step S6 and step S7 of the construction method of the present invention;

[0047] Fig.12 It is a schematic cross-sectional view of the jacking pit of the present invention;

[0048] In the figure:

[0049] 1- rotating bridge; 11- pile foundation; 12- lower pedestal; 13- rotating device; 14- upper pedestal; 15- pier; 16- main beam; 17- post-cast concrete; 18- full support;

[0050] 2- Pipeline gallery;

[0051] 3-jacking pit; 31-support pile; 32-crown beam; 33-horizontal support; 34-pit bottom platform; 35-back pile; 36-back wall; 37-transfer platform; 38-jacking device;

[0052] 4- Existing railways;

[0053] 5-Pit top platform; 51-Load bearing beam; 52-Platform panel;

[0054] 6-suspension crane; 61-longitudinal track; 62-longitudinal device; 63-transverse track; 64-lifting device;

[0055] 7- Lifting machinery.

[0056] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0058] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0061] A method for synchronously constructing a cross-railway rotating bridge and an underpass under a complex urban environment, characterized in that the specific steps are:

[0062] S1. Preparation before construction:

[0063] Carry out road, water, electricity and site leveling;

[0064] Establish a project department at the construction site, prepare construction organization plans and various hazardous plans and organize expert reviews. At the same time, submit relevant plans to various departments related to the project, especially the railway department, and complete necessary procedures;

[0065] S2, foundation construction and construction of pedestal, crown beam 32, and horizontal support 33:

[0066] The foundation includes the pile foundation 11 of the rotating bridge 1, the supporting piles 31 and the back piles 35 of the jacking pit 3, and the pile foundation 11, the supporting piles 31 and the back piles 35 are measured, laid out and constructed. The pile foundation 11 is cast to the bottom elevation of the foundation pit of the rotating bridge 1, the supporting piles 31 are cast to the bottom elevation of the crown beam 32, and the back piles 35 are cast to the top elevation of the transfer platform 37;

[0067] After the foundation construction is completed, the foundation pit of the pedestal of the rotating bridge 1 and the foundation pit of the crown beam of the jacking pit 3 are excavated. The foundation pit of the pedestal is excavated to the bottom elevation of the lower pedestal 12, and the foundation pit of the crown beam is excavated to the bottom elevation of the crown beam 32. After the excavation is completed, the lower pedestal 12 of the rotating bridge 1 and the crown beam 32 and horizontal support 33 of the jacking pit 3 are constructed. No supporting piles 31 are set on one side of each jacking pit 3 close to the existing railway 4, and a row of supporting piles 31 are set on the remaining three sides. A crown beam 32 is set on the top of the supporting pile 31, and a number of horizontal supports 33 are set between the crown beams 32 and only one layer is set.

[0068] When excavating the foundation pit of the pedestal of the rotating bridge 1, the excavation method shall be determined according to the buried depth of the pedestal and the geological survey report. If the conditions for slope excavation are not met, steel sheet piles shall be driven for excavation.

[0069] Before the construction of the lower pedestal 12, the crown beam 32 and the horizontal support 33, the embedded parts required for the swivel device 13 and the hanging crane 6 are installed at the corresponding positions;

[0070] The plurality of horizontal supports 33 between the two crown beams 32 of each jacking pit 3 are provided in only one layer at the top of the jacking pit 3;

[0071] The length and diameter of the support pile 31 are determined based on the soil mechanics calculation of the foundation pit support and the structure of the rotating bridge 1 and the deadweight of the support transmitted from the pit top platform 5 to the top of the support pile 31; the cross-sectional size of the horizontal support 33 is determined based on the axial soil reaction force transmitted to the horizontal support 33 and the vertical concentrated force transmitted to the horizontal support 33 by the suspended crane 6 and the hanging weight; the length and diameter of the back pile 35 are determined based on the soil mechanics calculation of the foundation pit support and the jacking force when the pipe gallery 2 is jacked;

[0072] S3, installation of rotating device 13 and first excavation of jacking pit 3:

[0073] The rotating device 13 is installed on the lower cap 12, and the first excavation of the jacking pit 3 is carried out by an excavator. The first excavation is carried out to the transfer platform 37. After the excavation is completed, the pile head of the back pile 35 is processed, and the transfer platform 37 is cast after the pit bottom is leveled;

[0074] The transfer platform 37 is higher than the pit bottom platform 34. The height difference between the transfer platform 37 and the pit bottom platform 34 meets the height requirement of the back wall 36 required for the jacking of the pipe gallery 2. The height difference between the transfer platform 37 and the suspension crane 6 meets the hoisting clearance requirement required by the suspension crane 6.

[0075] Before the first excavation of the jacking pit 3, determine whether it is necessary to dewater the foundation pit and the form of dewatering according to the groundwater conditions. If the groundwater level is high, dewatering is required in advance to at least 0.5m below the bottom of the foundation pit;

[0076] S4, construction of upper platform 14, pier 15 and second excavation of jacking pit 3:

[0077] After the installation of the rotating device 13 is completed, the upper platform 14 and the pier 15 of the rotating bridge 1 are constructed in sequence; at the same time, the jacking pit 3 is continued to be excavated to the pit bottom elevation, and the pit bottom platform 34 is cast after leveling and the back wall 36 is constructed;

[0078] During the second excavation of the jacking pit 3, the excavator was first used to excavate to 0.3m above the bottom of the pit, and the remaining part was excavated manually;

[0079] S5. Bracket and equipment installation:

[0080] First, a suspension crane 6 is installed at the bottom of the horizontal support 33; secondly, a pit top platform 5 is installed at the top of the crown beam 32; finally, the ground is hardened or treated, and a full-bridge bracket 18 is set up on the original ground and the pit top platform 5, and the width of the full-bridge bracket is greater than the bridge deck width of the rotating bridge 1;

[0081] The suspended crane 6 comprises two longitudinal tracks 61 arranged symmetrically along the center line of the pipe gallery 2 at the bottom of the horizontal support 33, longitudinal devices 62 respectively arranged on the longitudinal tracks 61, a transverse track 63 arranged at the bottom of the longitudinal device 62 and perpendicular to the longitudinal device 62, and two sets of lifting devices 64 arranged on the transverse track 63; the longitudinal device 62 can slide longitudinally along the longitudinal track 61, and the lifting device 64 can move transversely along the transverse track 63; the longitudinal track 61, the longitudinal device 62, the transverse track 63, and the lifting device 64 are prefabricated in advance in the factory, and the longitudinal track 61 is divided into sections. Prefabrication: the total length of the longitudinal track 61 should be greater than the distance between the rear end of the jacking pit 3 and the front end of the pipe gallery 2, so that the working range of the suspension crane 6 covers the entire pipe gallery 2 and the transfer platform 37; the prefabricated suspension crane 6 components are transported to the site, and the longitudinal track 61 is first connected and fixed to the embedded parts buried at the bottom of the horizontal support 33 in sections, and then a set of longitudinal devices 62 is installed on each longitudinal track 61, and then the transverse track 63 is installed to the bottom of the two sets of longitudinal devices 62, and finally the two sets of lifting devices 64 are installed on the transverse track 63 and connected to other power equipment;

[0082] The pit top platform 5 includes a plurality of groups of longitudinal load-bearing beams 51 arranged on the top of the crown beam 32 and perpendicular to the axis of the pipe gallery 2, and a platform panel 52 arranged on the load-bearing beams 51; the span of the load-bearing beams 51 is greater than the distance between the axes of the support piles 31 on both sides, the width of the pit top platform 5 is greater than the width of the full-chamber bracket 18, and a safety range is reserved on both sides to prevent the bridge deck from falling into the jacking pit 3 during the construction of the main beam 16 of the rotating bridge 1; the load-bearing beam 51 determines the appropriate structural form according to the width and load of the jacking pit 3, and preferably uses prefabricated assembled steel structures such as Bailey sheets or steel sections; the platform panel 52 adopts a prefabricated structure welded with steel sections and steel plates, which is prefabricated in the factory in blocks, transported to the site, and hoisted to the load-bearing beam 51 for connection and fixation;

[0083] S6, main beam 16 and pipe gallery 2 construction:

[0084] Pre-press the full-span support 18 according to the design and specification requirements. After passing the supervisory acceptance, set the main beam template on the full-span support 18, tie the main beam steel bars, and cast the main beam 16. At the same time, set the pipe gallery template on the pit bottom platform 34, tie the pipe gallery steel bars, and cast the pipe gallery 2.

[0085] During the construction of the pipe gallery 2, the pipe gallery template, the pipe gallery steel bars and the construction machinery and equipment are first hoisted and placed on the transfer platform 37 by the lifting machinery 7, and then the suspension crane 6 moves longitudinally along the longitudinal track 61 to the top of the transfer platform 37, and the pipe gallery template, the pipe gallery steel bars and the construction machinery and equipment are hoisted and transported to the corresponding position for installation along the longitudinal track 61; the pipe gallery steel bar binding, the pipe gallery template installation and the concrete pouring are all carried out step by step from the end of the pipe gallery 2 adjacent to the existing railway 4 to the tail end;

[0086] S7, Rotation construction of rotating bridge 1 and jacking construction of pipe gallery 2:

[0087] Install a jacking device 38 between the rear end of the pipe gallery 2 and the back wall 36, select meteorological conditions that meet the requirements of rotation and jacking construction, and apply to the railway department for a construction window period to carry out the rotation construction of the rotating bridge 1 and the jacking construction of the pipe gallery 2; during the rotation and jacking process, monitor the relevant parameters of the existing railway 4 and other buildings and structures within the affected range in accordance with the design and specification requirements;

[0088] S8, equipment dismantling and post-pour concrete 17 construction;

[0089] The full-span support 18, the pit top platform 5, the suspended crane 6, and the jacking device 38 are dismantled in sequence, and the gap between the upper pedestal 14 and the lower pedestal 12 is filled with post-poured concrete 17 according to the design requirements, completing the entire construction of the cross-rail swivel bridge 1 and the underpass part of the pipeline corridor 2.

[0090] The present invention proposes a method for the simultaneous construction of a municipal cross-railway rotating bridge 1 and an underpass 2 under many restrictive conditions such as limited time and space, which solves a series of problems such as construction delays, breach of contract, claims, etc. caused by the inability to simultaneously construct the cross-railway rotating bridge 1 and the underpass 2 in a complex urban environment due to construction conditions. The method can effectively shorten the construction period and reduce the cost of the project.

[0091] The present invention combines rotation and jacking into one, and only needs to go through railway-related procedures and apply for construction window period once, which greatly reduces the impact of construction on railway. In the past, when the rotation of the cross-railway rotating bridge 1 and the jacking of the pipe gallery 2 were constructed separately, it was necessary to go through railway-related procedures twice, and it was necessary to apply for construction window period twice from the railway department during the rotation process and the jacking process, which had many impacts on railway operation and lasted for a long time.

[0092] The construction method proposed in the present invention transfers part of the load of casting the rotating bridge 1 to the foundation pit support piles 31 through the pit top platform 5, which can not only fully utilize the vertical bearing capacity of the support piles 31, but also save the foundation treatment work required for the erection of the full-bridge support 18 within the foundation pit range, which can significantly save the cost of construction measures and improve economy.

[0093] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for synchronously constructing a rotating bridge across a railway and an underpass under a pipe gallery in a complex urban environment, characterized in that: The specific steps are: S1. Preparation before construction: Carry out road, water, electricity and site leveling; S2. Construction of foundation and foundation, cap beam (32), and horizontal support (33): The foundation includes a pile foundation (11) of the rotating bridge (1), a supporting pile (31) and a back pile (35) of the jacking pit (3), and the pile foundation (11), the supporting pile (31) and the back pile (35) are measured, laid out and constructed, wherein the pile foundation (11) is cast to the bottom elevation of the foundation pit of the pedestal of the rotating bridge (1), the supporting pile (31) is cast to the bottom elevation of the crown beam (32), and the back pile (35) is cast to the top elevation of the transfer platform (37); After the foundation construction is completed, the foundation pit of the pedestal of the rotating bridge (1) and the foundation pit of the crown beam of the jacking pit (3) are excavated. The foundation pit of the pedestal is excavated to the bottom elevation of the lower pedestal (12), and the foundation pit of the crown beam is excavated to the bottom elevation of the crown beam (32). After the excavation is completed, the lower pedestal (12) of the rotating bridge (1) and the crown beam (32) and horizontal support (33) of the jacking pit (3) are constructed. Before the construction, the embedded parts required for the rotating device (13) and the suspended crane (6) are installed at the corresponding positions. No supporting piles (31) are arranged on one side of each jacking pit (3) close to the existing railway (4), and a row of supporting piles (31) are arranged on the remaining three sides. A crown beam (32) is arranged on the top of the supporting pile (31), and a plurality of horizontal supports (33) are arranged between the crown beams (32) and only one layer is arranged. S3. Installation of the rotating device (13) and first excavation of the jacking pit (3): A rotating device (13) is installed on the lower cap (12), and at the same time, the first excavation of the top entry pit (3) is carried out by using an excavator, and the first excavation is carried out to the transfer platform (37). After the excavation is completed, the pile head of the back pile (35) is processed, and the transfer platform (37) is poured after the pit bottom is leveled; S4, construction of the upper bearing platform (14), piers (15) and second excavation of the jacking pit (3): After the installation of the rotating device (13) is completed, the upper bearing platform (14) and the pier (15) of the rotating bridge (1) are constructed in sequence; at the same time, the jacking pit (3) is continued to be excavated to the pit bottom elevation, and after leveling, the pit bottom platform (34) is cast and the back wall (36) is constructed; S5. Bracket and equipment installation: First, a suspension crane (6) is installed at the bottom of the horizontal support (33); secondly, a pit top platform (5) is installed at the top of the crown beam (32); finally, the ground is hardened or treated, and a full-bridge bracket (18) is set up on the original ground and the pit top platform (5), wherein the width of the full-bridge bracket is greater than the bridge deck width of the rotating bridge (1); S6, main beam (16) and pipe gallery (2) construction: Pre-press the full-span support (18) in accordance with the design and specification requirements. After passing the supervisor's acceptance, set up the main beam template on the full-span support (18), tie up the main beam reinforcement, and cast the main beam (16). At the same time, set up the pipe gallery template on the pit bottom platform (34), tie up the pipe gallery reinforcement, and cast the pipe gallery (2); S7. Rotational bridge (1) rotation construction and pipe gallery (2) jacking construction: Installing a jacking device (38) between the rear end of the pipe gallery (2) and the rear wall (36) to carry out the rotation construction of the rotating bridge (1) and the jacking construction of the pipe gallery (2); S8, equipment dismantling and post-pour concrete (17) construction; The full-span support (18), the pit top platform (5), the suspended crane (6), and the jacking device (38) are removed in sequence, and the gap between the upper pedestal (14) and the lower pedestal (12) is filled with post-cast concrete (17) in accordance with the design requirements, thereby completing the entire construction of the cross-rail swivel bridge (1) and the underpass portion of the pipe gallery (2).

2. The method for synchronously constructing a rotating bridge across a railway and a pipe gallery under a complex urban environment according to claim 1, characterized in that: In step S2, when the foundation pit of the pedestal of the rotating bridge (1) is excavated, the excavation method is determined according to the buried depth of the pedestal and the geological survey report. When the conditions for slope excavation are not met, steel sheet piles are driven for excavation.

3. The method for synchronously constructing a rotating bridge across a railway and an underpass under a complex urban environment according to claim 2, characterized in that: In step S2, the pile length and pile diameter of the support pile (31) are determined based on the foundation pit support soil mechanics calculation and the structure of the rotating bridge (1) and the deadweight of the support transmitted from the pit top platform (5) to the pile top of the support pile (31); the cross-sectional dimensions of the horizontal support (33) are determined based on the axial soil reaction force transmitted to the horizontal support (33) and the vertical concentrated force transmitted to the horizontal support (33) by the suspended crane (6) and the hanging weight; and the pile length and pile diameter of the back pile (35) are determined based on the foundation pit support soil mechanics calculation and the jacking force when the pipe gallery (2) is jacked.

4. The method for synchronously constructing a rotating bridge across a railway and a pipe gallery under a complex urban environment according to claim 1, characterized in that: In step S3, the transfer platform (37) is higher than the pit bottom platform (34), the height difference between the transfer platform (37) and the pit bottom platform (34) meets the height requirement of the back wall (36) required for the jacking of the pipe gallery (2), and the height difference between the transfer platform (37) and the suspension crane (6) meets the hoisting clearance requirement required by the suspension crane (6).

5. The method for synchronously constructing a rotating bridge across a railway and a pipe gallery under a complex urban environment according to claim 4, characterized in that: In step S3, before the first excavation of the jacking pit (3), it is determined whether it is necessary to dewater the foundation pit and the form of dewatering to be adopted according to the groundwater conditions. If the groundwater level is high, dewatering needs to be carried out in advance to at least 0.5m below the bottom of the foundation pit.

6. The method for synchronously constructing a rotating bridge across a railway and an underpass under a complex urban environment according to claim 1, characterized in that: In step S4, during the second excavation of the jacking pit (3), an excavator is first used to excavate to 0.3 m above the pit bottom, and the remaining part is excavated manually.

7. The method for synchronously constructing a rotating bridge across a railway and an underpass under a complex urban environment according to claim 1, characterized in that: In step S5, the suspended crane (6) comprises two longitudinal tracks (61) arranged at the bottom of the horizontal support (33) and arranged symmetrically along the center line of the pipe gallery (2), longitudinal devices (62) respectively arranged on the longitudinal tracks (61), a transverse track (63) arranged at the bottom of the longitudinal device (62) and perpendicular to the longitudinal device (62), and two sets of lifting devices (64) arranged on the transverse track (63); the longitudinal tracks (61), the longitudinal device (62), the transverse track (63), and the lifting devices (64) are prefabricated in advance in the factory, and the longitudinal tracks (61) Prefabricate in sections, the total length of the longitudinal track (61) should be greater than the distance between the rear end of the jacking pit (3) and the front end of the pipe gallery (2); transport the prefabricated components of the suspension crane (6) to the site, first connect and fix the longitudinal track (61) to the embedded parts buried at the bottom of the horizontal support (33) in sections, then install a set of longitudinal devices (62) on each longitudinal track (61), then install the transverse track (63) to the bottom of the two sets of longitudinal devices (62), and finally install the two sets of lifting devices (64) on the transverse track (63) and connect other power equipment.

8. The method for synchronously constructing a rotating bridge across a railway and a pipe gallery under a complex urban environment according to claim 7, characterized in that: In step S5, the pit top platform (5) comprises a plurality of groups of longitudinal load-bearing beams (51) arranged on the top of the crown beam (32) and perpendicular to the axis of the pipe gallery (2), and a platform panel (52) arranged on the load-bearing beams (51); the span of the load-bearing beams (51) is greater than the distance between the axes of the support piles (31) on both sides, the width of the pit top platform (5) is greater than the width of the full-chamber bracket (18) and a safety range is reserved on both sides; the load-bearing beams (51) determine a suitable structural form according to the width and load of the jacking pit (3); the platform panel (52) adopts a prefabricated structure welded with steel sections and steel plates, which is prefabricated in a factory in blocks, transported to the site, and hoisted to the load-bearing beams (51) for connection and fixation.

9. The method for synchronously constructing a rotating bridge across a railway and a pipe gallery under a complex urban environment according to claim 1, characterized in that: In step S6, when the pipe gallery (2) is constructed, the pipe gallery template, the pipe gallery reinforcement and the construction machinery and equipment are first hoisted onto the transfer platform (37) using a lifting machine (7), and then the suspension crane (6) moves longitudinally along the longitudinal track (61) to the top of the transfer platform (37), and the pipe gallery template, the pipe gallery reinforcement and the construction machinery and equipment are hoisted and transported to the corresponding position along the longitudinal track (61) for installation; the pipe gallery reinforcement binding, the pipe gallery template installation and the concrete pouring are all carried out step by step from the end of the pipe gallery (2) adjacent to the existing railway (4) to the rear end.

10. The method for synchronously constructing a rotating bridge across a railway and an underpass under a complex urban environment according to claim 1, characterized in that: In step S7, meteorological conditions that meet the requirements of rotation and jacking construction are selected, and an application is made to the railway department for a construction window period to carry out rotation construction of the rotating bridge (1) and jacking construction of the pipe gallery (2). During the rotation and jacking process, the relevant parameters of the existing railway (4) and other buildings and structures within the affected area are monitored throughout the process in accordance with the design and specification requirements.

Images