Assembly type prestressed concrete box girder swivel bridge erecting machine and construction method

Abstract

This invention relates to a prefabricated prestressed concrete box girder rotating bridge erection machine and its construction method. Existing rotating methods cause significant disruption to railway operations during bridge construction. In this invention, the rotating bridge erection machine's tower is positioned at the top of the lower crossbeam of the tower, and the bridge deck beam is horizontally positioned below the lower crossbeam and arranged longitudinally. The stay cables are symmetrically arranged on both longitudinal sides of the tower, with their top ends fixed to the side of the tower and their bottom ends fixed to the top of the bridge deck beam. The lower support legs are located at the bottom of both transverse ends of the lower crossbeam, and auxiliary rotating components are provided at the bottom of the lower support legs. This invention allows for the entire bridge to be rotated and positioned in one go, eliminating the need for multiple crossings, and controlling the beam erection time within a single construction window. It can achieve both beam and pier rotation, offering good versatility, a short construction period, and minimal disruption to railway operations.

Description

Technical Field

[0001] This invention relates to the field of transportation bridge construction technology, specifically to a prefabricated prestressed concrete box girder rotating bridge erection machine and its construction method. Background Technology

[0002] Highway bridges with ordinary spans often use precast prestressed concrete box girders. Precast prestressed concrete box girders offer advantages such as strong versatility, factory fabrication followed by prefabrication and assembly, low investment, short construction period, and convenient erection. Precast prestressed concrete box girders are generally erected using bridge erecting machines, which commonly include single-guide beam bridge erecting machines, double-guide beam bridge erecting machines, and walking-type bridge erecting machines.

[0003] Currently, bridge erection machines generally employ a double-guide beam type. This type of machine consists of two main beams and six outriggers. Its working principle is as follows: First, the front main beam passes through the span, then the front outriggers are lowered onto the pier cap beam of the span to be erected. The middle and rear outriggers are then lowered onto the next span where the beam is stored. A beam lifting machine lifts the beam, and after passing through the span along the main beam direction, it is lowered using a lateral movement device. One beam is erected at a time, ultimately forming the entire bridge deck for the span to be erected. After the span is erected, the rear outriggers are retracted, the bridge erection machine moves forward, and the rear outriggers are lowered onto the pier of the previous span. The front guide beam then moves to the next span, repeating the beam erection cycle.

[0004] Existing traditional bridge erecting machine construction methods have problems or can be optimized for the following engineering situations, including:

[0005] When using traditional bridge erecting machines to erect precast prestressed concrete box girders, the leading beam of the machine needs to pass through the span first. After passing through the span, a single beam is moved forward along the bridge direction by a mobile crane, and then lowered laterally. Since the span consists of several precast prestressed concrete box girders, it needs to pass through the span several times. When erecting girders on overpasses across railways, multiple spans are required, and each span must be carried out during the railway maintenance window. This results in a long erection cycle and significant disruption to railway operations.

[0006] The precast prestressed concrete box girder bridge span is composed of multiple box girders, with pre-reserved wet joints between each girder. After the girder is erected, the wet joints must be poured in place before the entire bridge span can be formed. The pouring of the wet joints also needs to be carried out during railway maintenance windows, which results in a long construction period and significant disruption to railway operations.

[0007] To reduce interference with railway operations, most railway bridges now use swing bridges. These bridges are T-shaped or continuous beams that cross the railway directly by rotating the piers. The rotation time is short and the interference with the railway is small. However, swing bridges are all specially designed, have poor versatility, and require high investment.

[0008] Precast prestressed concrete box girder bridges are generally simply supported beam bridges or bridges that are initially simply supported and then become continuous beam bridges. This type of bridge span is characterized by its versatility, ease of construction, and low investment. However, because this type of bridge span cannot be constructed by rotating the piers, the bridge spans across the railway can only be erected by longitudinally erecting beams using a bridge erecting machine. Therefore, the traditional bridge erecting machine construction method causes significant disruption to railway operations. Summary of the Invention

[0009] The purpose of this invention is to provide a prefabricated prestressed concrete box girder rotating bridge erection machine and construction method to solve the problems of significant interference with railway operations during the construction of rotating bridges by existing equipment and methods.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0011] A prefabricated prestressed concrete box girder rotating bridge erection machine, comprising a rotating bridge erection machine tower, a rotating bridge erection machine stay cables, a lower crossbeam of the rotating bridge erection machine tower, a bridge deck beam frame of the rotating bridge erection machine, and lower support legs of the rotating bridge erection machine;

[0012] The tower of the rotating bridge erecting machine is vertically installed on the top of the lower crossbeam of the tower, and the bridge deck beam of the rotating bridge erecting machine is horizontally installed below the lower crossbeam of the tower and arranged longitudinally.

[0013] The stay cables of the rotating bridge erecting machine are symmetrically arranged on both longitudinal sides of the tower of the rotating bridge erecting machine. The top end of the stay cable is fixed to the side of the tower of the rotating bridge erecting machine, and the bottom end of the stay cable is fixed to the top of the bridge deck beam of the rotating bridge erecting machine.

[0014] The lower support legs of the rotating bridge erecting machine are located at the bottom of the two transverse ends of the lower crossbeam of the tower of the rotating bridge erecting machine and on both transverse sides of the bridge deck beam frame of the rotating bridge erecting machine. The bottom of the lower support legs of the rotating bridge erecting machine is provided with auxiliary rotating components.

[0015] Furthermore, two towers of the rotating bridge erecting machine are arranged side by side in the transverse direction, and the two towers are arranged symmetrically in the transverse direction at the top of the lower crossbeam of the tower.

[0016] A crossbeam for the upper part of the two rotating bridge erecting machine towers is provided between them.

[0017] Furthermore, the bridge deck beam frame of the rotating bridge erecting machine includes mutually perpendicular longitudinal beams and transverse beams of the rotating bridge erecting machine.

[0018] The bridge deck longitudinal beams of the rotating bridge erecting machine are arranged in parallel in two rows, and the bridge deck crossbeams of the rotating bridge erecting machine are arranged at intervals between the two rows of the bridge deck longitudinal beams.

[0019] Furthermore, the bridge deck crossbeam of the rotating bridge erecting machine is equipped with vertical beam hangers, the bottom of which is used to be fixed together with the precast prestressed concrete box girder.

[0020] Furthermore, the bottom end of the stay cable of the rotating bridge erecting machine is fixed to the top of the beam hanger.

[0021] In one embodiment, the auxiliary rotating component is a sliding wheel of a rotating bridge erecting machine.

[0022] This solution provides a construction method for the prefabricated prestressed concrete box girder rotating bridge erection machine as described above, the method comprising:

[0023] Construct rotating bridge piers, pour pier cap beams on top of rotating bridge piers, and install rotating ball hinges on top of pier cap beams;

[0024] A support frame for the sliding track of the rotating bridge erecting machine is erected on the outside of the rotating pier, and a ring-shaped sliding track for the rotating bridge erecting machine is installed on the top of the support frame.

[0025] Assemble the rotating bridge erecting machine by placing the sliding wheels of the rotating bridge erecting machine on the lower slide track of the rotating bridge erecting machine;

[0026] A pad is placed between the bridge deck crossbeam of the swing bridge erecting machine and the prefabricated prestressed concrete box girder, and the prefabricated prestressed concrete box girder and the swing bridge erecting machine are temporarily fixed together using the beam suspension rods.

[0027] The bottom of the precast prestressed concrete box girder contacts the rotating ball joint, and the sliding wheel of the rotating bridge erecting machine moves on the lower track of the rotating bridge erecting machine, so that the precast prestressed concrete box girder and the rotating bridge erecting machine rotate synchronously.

[0028] In another embodiment, the auxiliary rotating component is the anchorage support on the pier top of the rotating bridge erecting machine.

[0029] This solution provides a construction method for the prefabricated prestressed concrete box girder rotating bridge erection machine as described above, the method comprising:

[0030] Construct the lower turntable and the upper turntable of the rotating bridge pier; install a rotating ball hinge on the top of the lower turntable of the rotating bridge pier; and install a rotating bridge pier support slide between the lower turntable and the upper turntable of the rotating bridge pier and around the lower turntable of the rotating bridge pier.

[0031] A rotating pier is constructed on top of a turntable on the rotating pier, and a pier cap beam is poured on top of the rotating pier. A precast prestressed concrete box girder is supported on top of the pier cap beam using temporary supports.

[0032] Assemble the rotating bridge erecting machine and temporarily fix the pier top anchorage support of the rotating bridge erecting machine to the top of the pier cap beam;

[0033] A pad is placed between the bridge deck crossbeam of the swing bridge erecting machine and the prefabricated prestressed concrete box girder, and the prefabricated prestressed concrete box girder and the swing bridge erecting machine are temporarily fixed together using the beam suspension rods.

[0034] The bottom of the turntable on the rotating pier contacts the rotating ball hinge, and the prefabricated prestressed concrete box girder, pier cap beam, rotating pier, and turntable on the rotating pier rotate synchronously with the rotating bridge erecting machine.

[0035] Furthermore, after the prefabricated prestressed concrete box girders are hoisted into place, they are arranged longitudinally and parallel to each other, and the cast-in-place wet joints between adjacent prefabricated prestressed concrete box girders form the entire bridge deck.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. When using traditional bridge erecting machines to erect precast prestressed concrete box girders, the machine's guide beam must first pass through a span. After passing through the span, a mobile crane moves one girder forward along the bridge direction each time, then lowers the girder laterally. Since each span consists of several precast prestressed concrete box girders, multiple spans are required. Erecting bridge girders across railway lines requires multiple spans, each occurring within a railway maintenance window, resulting in a long erection cycle and significant disruption to railway operations. The rotating bridge erecting machine of this invention allows the entire bridge to be rotated and positioned in one go, eliminating the need for multiple spans. The erection time is controlled within a single maintenance window, minimizing disruption to railway operations.

[0038] 2. Precast prestressed concrete box girder bridge spans consist of multiple box girders, with pre-reserved wet joints between each girder. These wet joints must be poured after the girder is erected to form the complete bridge span. The pouring of these wet joints also requires railway maintenance windows, resulting in a long construction period and significant disruption to railway operations. Using the rotating bridge erecting machine of this invention, the girder is erected as a single span, eliminating the need for wet joint construction. This simplifies the girder erection process and minimizes disruption to railway operations.

[0039] 3. Precast prestressed concrete box girder bridges are generally simply supported beam bridges or bridges that are initially simply supported and then become continuous beam bridges. This type of bridge span has the characteristics of strong versatility, simple construction, and low investment. The rotating bridge erection machine of this invention solves the problem of rotating and erecting precast prestressed concrete box girders that cannot be solved by traditional solutions, realizes the versatility of the beam body, simplifies construction, and saves investment.

[0040] 4. The prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention can be used for construction in two models, A and B, which respectively solve the two situations of beam rotation and pier rotation. It has good versatility and is easy to use.

[0041] 5. The prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention solves the problem of bridge erection machine dismantling. The prefabricated prestressed concrete box girder rotating bridge erection machine can be dismantled through the existing bridge deck after the bridge rotation and erection are completed, without affecting railway operation, and has high safety and usability.

[0042] 6. The prefabricated prestressed concrete box girder rotating bridge erecting machine of the present invention can adapt to various bridge widths by adjusting the length of the crossbeam under the tower of the rotating bridge erecting machine, and has good versatility and adaptability.

[0043] 7. The prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention consists of prefabricated components, which have a simple structure, good stress performance, and are easy to install and disassemble. The beam is suspended by a hanger rod, which is easy to construct and facilitates the erection and positioning of the beam.

[0044] 8. The prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention is used. The prefabricated prestressed concrete box girder is prefabricated in the factory, is of a universal type, is lightweight, and has a small rotating pier. Compared with rotating T-shaped structures or continuous beams, it can significantly reduce the project cost and construction period. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0046] Figure 1 This is an elevation view of the A-type bridge erection mechanism of the prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention;

[0047] Figure 2 Cross-sectional view of the A-type bridge erection mechanism of the prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention.

[0048] Figure 3 This is a structural plan view of the A-type bridge erection mechanism of the prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention;

[0049] Figure 4 This is an elevation view of the B-type bridge erection mechanism of the prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention.

[0050] Figure 5 This is a cross-sectional view of the B-type bridge erection mechanism of the prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention.

[0051] Figure 6 This is a structural plan view of the B-type bridge erection mechanism of the prefabricated prestressed concrete box girder rotating bridge erection machine of the present invention;

[0052] Figure 7 This is a diagram of the prefabricated prestressed concrete box girder rotating bridge erection machine A-type bridge erection machine construction slide support of the present invention;

[0053] Figure 8 This is a plan view of the prefabricated prestressed concrete box girder rotating bridge erection machine A-type bridge erection machine of the present invention.

[0054] Figure 9 This is a cross-sectional view of the prefabricated prestressed concrete box girder rotating bridge erection machine A-type bridge erection machine of the present invention during the bridge erection construction.

[0055] Figure 10 This is an elevation view of the prefabricated prestressed concrete box girder rotating bridge erection machine A-type bridge erection machine of the present invention for bridge erection construction;

[0056] Figure 11 This is a structural diagram of the pier rotation slide of the B-type bridge erecting machine for prefabricated prestressed concrete box girder rotation, as described in this invention.

[0057] Figure 12 This is a plan view of the prefabricated prestressed concrete box girder rotating bridge erection machine (Type B) of the present invention for bridge erection construction.

[0058] Figure 13 This is a cross-sectional view of the prefabricated prestressed concrete box girder rotating bridge erection machine (Type B) of the present invention during bridge erection.

[0059] Figure 14 This is an elevation view of the prefabricated prestressed concrete box girder rotating bridge erection machine (Type B) of the present invention, showing its bridge erection construction.

[0060] Figure 15 This is a schematic diagram of the rotation and dismantling construction of a prefabricated prestressed concrete box girder bridge erection machine.

[0061] The diagram is labeled as follows:

[0062] 1-Rotating bridge erecting machine tower, 2-Rotating bridge erecting machine tower upper crossbeam, 3-Rotating bridge erecting machine cable stays, 4-Rotating bridge erecting machine tower lower crossbeam, 5-Rotating bridge erecting machine bridge deck longitudinal beam, 6-Rotating bridge erecting machine bridge deck crossbeam, 7-Beam suspension rod, 8-Rotating bridge erecting machine lower support leg, 9-Rotating bridge erecting machine sliding wheel, 10-Rotating bridge erecting machine lower slide, 11-Rotating ball hinge, 12-Padded block, 13-Precast prestressed concrete box girder, 14-Pier cap beam, 15-Rotating bridge erecting machine lower slide support, 16-Rotating pier, 17-Railway line, 18-Cast-in-place wet joint, 19-Rotating bridge erecting machine pier top anchorage support, 20-Rotating pier upper turntable, 21-Rotating pier lower turntable, 22-Rotating pier support slide. Detailed Implementation

[0063] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0064] In the description of this patent, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "horizontal", "longitudinal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent.

[0065] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "fixing," "consolidation," "setting," and "arrangement," etc., should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0066] In a specific implementation, Figure 1 The direction from left to right in the middle is defined as the vertical direction, and the direction perpendicular to it is defined as the horizontal direction. Figure 2 The side closer to the midline is defined as the inner side, and the side farther from the midline is defined as the outer side.

[0067] This invention provides a rotating bridge erecting machine for rotating the beam portion of precast prestressed concrete box girders in highway overpass railway bridge projects. The rotating bridge erecting machine can be temporarily fixed to a portion of the bridge structure and rotate synchronously. Depending on the bridge structure rotating synchronously with the rotating bridge erecting machine, the rotating bridge erecting machine of this invention can be divided into two types:

[0068] Example 1: Type A bridge erecting machine

[0069] like Figure 1-3 The Type A bridge erecting machine includes a rotating bridge erecting machine tower 1, a rotating bridge erecting machine stay cable 3, a rotating bridge erecting machine tower lower crossbeam 4, a rotating bridge erecting machine bridge deck beam frame, and a rotating bridge erecting machine lower support leg 8.

[0070] like Figure 3The bridge deck girder of the bridge erecting machine is horizontally positioned below the lower crossbeam 4 of the bridge tower and arranged longitudinally. The bridge deck girder is a lattice frame structure, comprising mutually perpendicular longitudinal beams 5 and transverse beams 6, all of which are I-beams. Two parallel longitudinal beams 5 are arranged, and several transverse beams 6 are spaced between the two longitudinal beams 5.

[0071] like Figure 2 The rotating bridge erecting machine tower 1 is vertically installed on top of the lower crossbeam 4. Two rotating bridge erecting machine towers 1 are arranged horizontally side by side, symmetrically positioned on top of the lower crossbeam 4. An upper crossbeam 2 is installed between the upper parts of the two rotating bridge erecting machine towers 1.

[0072] The rotating bridge erecting machine is not limited to the above-mentioned double-tower form. Depending on the width of the bridge deck, it can adopt the form of single tower or multiple towers. The force principle of the rotating bridge erecting machine is to form a low-tower cable-stayed bridge. The rotating bridge erecting machine suspends the beam and forms a temporary fixed system before rotating for construction.

[0073] The length of the lower crossbeam 4 of the tower of the rotating bridge erecting machine can be adjusted according to the width of the bridge deck. It can be in the form of two crossbeams or a single crossbeam. The length and number of crossbeams can be adjusted. It is also possible to use the precast prestressed concrete box girder 13 itself as the longitudinal and transverse beams.

[0074] like Figure 1 The stay cables 3 of the bridge erecting machine are symmetrically arranged on both longitudinal sides of the tower 1 of the bridge erecting machine. The top end of the stay cables 3 is fixed to the side of the tower 1 of the bridge erecting machine, and the bottom end of the stay cables 3 is fixed to the top of the bridge deck beam of the bridge erecting machine. Specifically, the bottom end of the stay cables 3 is fixed to the top of the beam hanger 7.

[0075] like Figure 2 Vertical beam hangers 7 are installed on the bridge deck crossbeam 6 of the swing bridge erecting machine. The bottom of the beam hangers 7 is used to fix the precast prestressed concrete box girder 13 as a whole. The beam hangers 7 can suspend the precast prestressed concrete box girder 13 on the swing bridge erecting machine. A balanced force system is formed by the bridge deck longitudinal beam 5, the lower crossbeam 4 of the swing bridge erecting machine tower, and the inclined cable 3 of the swing bridge erecting machine. The structure has simple force distribution and high reliability.

[0076] like Figure 1-3 The lower support leg 8 of the rotating bridge erecting machine is located at the bottom of both ends of the horizontal crossbeam 4 of the tower of the rotating bridge erecting machine and on both sides of the horizontal beam of the bridge deck of the rotating bridge erecting machine. The bottom of the lower support leg 8 of the rotating bridge erecting machine is equipped with an auxiliary rotating component.

[0077] The Type A bridge erecting machine is a beam-rotating type. In the Type A bridge erecting machine, the auxiliary rotating component is the rotating bridge erecting machine sliding wheel 9. When the Type A bridge erecting machine is used for the beam-rotating construction of precast prestressed concrete box girders, the bridge structure rotating synchronously with the rotating bridge erecting machine is the entire bridge deck, such as... Figure 7-10 The A-type bridge erecting machine and the prefabricated prestressed concrete box girder 13 are temporarily fixed together as a whole by the beam suspension rod 7. An external slide is set up to cooperate with the A-type bridge erecting machine, and the bridge is erected by pulling the A-type bridge erecting machine to rotate.

[0078] The specific process is as follows:

[0079] S1: Construct the rotating pier 16, pour the pier cap beam 14 on the top of the rotating pier 16, and install the rotating ball hinge 11 on the top of the pier cap beam 14.

[0080] S2: A sliding track support 15 for the rotating bridge pier 16 is erected on the outside of the rotating bridge pier 16, and a ring-shaped sliding track 10 for the rotating bridge pier is installed on the top of the sliding track support 15.

[0081] The precast prestressed concrete box girder 13 was hoisted into place along the railway direction. The precast prestressed concrete box girders 13 are arranged longitudinally and parallel to each other. The cast-in-place wet joints between adjacent precast prestressed concrete box girders 13 form the entire bridge deck.

[0082] S3: Assemble the rotating bridge erecting machine by placing the rotating bridge erecting machine sliding wheel 9 on the rotating bridge erecting machine sliding track 10.

[0083] S4: A pad 12 is installed between the bridge deck crossbeam 6 of the rotating bridge erecting machine and the precast prestressed concrete box girder 13. The precast prestressed concrete box girder 13 is temporarily fixed to the rotating bridge erecting machine using the beam suspension rod 7, and then tightened and fixed. The cable stays 3 of the rotating bridge erecting machine are tensioned to bear the load of the entire bridge. After weighing at the rotating ball joint 11, counterweights are added to the bridge deck to balance the weight on both sides of the bridge erecting machine, thus achieving the conditions for rotating girder erection.

[0084] S5: The bottom of the prefabricated prestressed concrete box girder 13 contacts the rotating ball hinge 11, and the sliding wheel 9 of the rotating bridge erecting machine on the lower support leg 8 moves on the lower slide track 10 of the rotating bridge erecting machine. The prefabricated prestressed concrete box girder 13 rotates synchronously with the rotating bridge erecting machine, that is, the entire bridge deck rotates synchronously with the rotating bridge erecting machine.

[0085] The Type A bridge erecting machine is suitable for rotating precast prestressed concrete box girders. It employs a temporary connection between the machine and the girder for rotation, placing no requirements on the pier structure and making it suitable for ordinary highway bridge piers. While the pier area during rotation is relatively small, a sliding support track for the rotating bridge erecting machine needs to be erected around it. The track diameter is relatively large, necessitating a high requirement for the bridge's clear span. This type of bridge erecting machine can be used for both rotating and erecting new bridges and dismantling existing bridges. Through reverse construction, the rotating bridge erecting machine can be used to dismantle entire sections of existing bridges.

[0086] Example 2: Type B bridge erecting machine

[0087] like Figure 4-6 The main structure of the B-type bridge erecting machine is the same as that of the A-type bridge erecting machine. The difference lies in the auxiliary rotating component of the B-type bridge erecting machine, which is the pier top anchorage support 19. When the B-type bridge erecting machine is used for the beam rotation construction of precast prestressed concrete box girders, the bridge structure that rotates synchronously with the rotating bridge erecting machine is the entire bridge deck, the pier cap beam 14, and the rotating pier 16. Figure 11-14 The B-type bridge erecting machine is a pier-rotating type. The lower support legs 8 on both sides of the B-type bridge erecting machine are fixed to the pier body through the pier top anchoring support 19. The precast prestressed concrete box girder 13 is temporarily fixed to the B-type bridge erecting machine through the beam suspension rod 7. The B-type bridge erecting machine, beam body and pier body are temporarily fixed to one body. The bridge is formed after the pier body is rotated.

[0088] The specific process is as follows:

[0089] S1: Construct the lower turntable 21 and the upper turntable 20 of the rotating pier. Install the rotating ball hinge 11 on the top of the lower turntable 21 of the rotating pier. Install the pier support slide 22 between the lower turntable 21 and the upper turntable 20 of the rotating pier and around the lower turntable 21 of the rotating pier.

[0090] S2: Construct a rotating pier 16 on top of the turntable 20 on the rotating pier, pour a pier cap beam 14 on top of the rotating pier 16, and use temporary supports to support the precast prestressed concrete box girder 13 above the pier cap beam 14.

[0091] The precast prestressed concrete box girder 13 was hoisted into place along the railway direction. The precast prestressed concrete box girders 13 are arranged longitudinally and parallel to each other. The cast-in-place wet joints between adjacent precast prestressed concrete box girders 13 form the entire bridge deck.

[0092] S3: Assemble the rotating bridge erecting machine and temporarily fix the pier top anchorage support 19 of the rotating bridge erecting machine to the top of the pier cap beam 14.

[0093] S4: A pad 12 is installed between the bridge deck crossbeam 6 of the rotating bridge erecting machine and the precast prestressed concrete box girder 13. The precast prestressed concrete box girder 13 is temporarily fixed to the rotating bridge erecting machine using the beam suspension rod 7, and then tightened and fixed. The cable stays 3 of the rotating bridge erecting machine are tensioned to bear the load of the entire bridge. After weighing at the rotating ball joint 11, counterweights are added to the bridge deck to balance the weight on both sides of the bridge erecting machine, thus achieving the conditions for rotating girder erection.

[0094] S5: The bottom of the turntable 20 on the rotating pier contacts the rotating ball hinge 11. The precast prestressed concrete box girder 13, the pier cap beam 14, the rotating pier 16, the turntable 20 on the rotating pier and the rotating bridge erecting machine rotate synchronously. That is, the entire bridge deck, the pier cap beam 14 and the rotating pier 16 rotate synchronously with the rotating bridge erecting machine.

[0095] The Type B bridge erecting machine is suitable for rotating precast prestressed concrete box girder piers. It employs a temporary connection between the bridge erecting machine and the beam, achieving bridge erection through pier rotation. Because this type of machine uses pier rotation with the turntable located at the pier, it places high demands on the pier structure, requiring a large pier and lower rotating structure. However, it eliminates the need for temporary sliding tracks and supports. The machine is temporarily fixed to the beam and pier, with the rotating structure located at the pier base. This results in a simple structural stress system, high construction safety, and is not limited by the size of the sliding track. It also has lower requirements for the bridge's clear span, making it suitable for rotating bridge erection operations on newly constructed bridges of various spans.

[0096] In the two embodiments described above, the precast prestressed concrete box girder 13 is a common form for overpasses over highways, with common spans of 40m and 30m. It is prefabricated at a bridge factory, erected by a bridge-building machine, and then the transverse wet joints between the box girders are poured to form the integral bridge deck.

[0097] The rotating bridge erecting machine of this invention can first prefabricate and assemble a complete bridge deck parallel to the railway direction, and then use the rotating bridge erecting machine to rotate and erect the bridge across the railway, thus avoiding the traditional method of erecting bridge beams one by one. After the bridge is rotated into place, the bridge erecting machine can be dismantled using the erected bridge deck, and the equipment can be dismantled and transported away across the already paved bridge deck without interfering with railway operations. Figure 15 The process of rotating, erecting, and dismantling bridge beams using a bridge-building rotating machine is as follows:

[0098] S1: Rotate the erected bridge-building machine into position as needed;

[0099] S2: After the bridge is rotated into place, the bridge-building machine is dismantled and transported away by using the prefabricated prestressed concrete box girder 13.

[0100] The rotating bridge erecting machine of this invention includes various structural types to adapt to different construction requirements. It solves the problem of rotating and erecting precast concrete box girder bridges on existing railway lines. It features a compact structure, simple construction, clear stress form, convenient installation and dismantling, short construction cycle, wide adaptability, low investment, and high utilization rate. Specifically, it has the following technical advantages:

[0101] 1. It can be applied to both prefabricated prestressed concrete box girder bridge erection by rotation of the beam section and bridge erection by rotation of the pier section, showing good versatility.

[0102] 2. It can be used to construct both simply supported beam bridges and bridges that are initially simply supported and then become continuous beam bridges, making it a widely applicable structure.

[0103] 3. It is applicable to bridges with various standard span sizes and widths. The span of the bridge can be adjusted by adjusting the length of the longitudinal beam 5 on the bridge deck of the rotating bridge erecting machine. The width of the bridge can be adjusted by adjusting the length of the lower crossbeam 4 of the tower and the length of the crossbeam 6 on the bridge deck of the rotating bridge erecting machine.

[0104] 4. The entire bridge deck can be erected. The wet joints between the box girders and the guardrail bridge deck system can all be prefabricated at one time. By first forming the entire bridge deck and then temporarily fixing the beam and the bridge erecting machine to the beam through the beam hanger 7 and pad block 12, it is possible to erect the entire span bridge within a railway track window.

[0105] 5. Ordinary highway bridge piers can be used without modifying the design of other bridge structures. The temporary rotating bridge erecting machine uses a sliding track and support to rotate the beam. The bridge erecting machine rotates with the beam without affecting the substructure, shortening the beam erection time, reducing interference with railway operations, and saving project investment.

[0106] 6. When using traditional bridge erecting machines to erect precast prestressed concrete box girders, the machine's guide beam must first pass through the span. After passing through the span, a mobile crane moves one girder forward along the bridge direction each time, then lowers the girder laterally. Since each span consists of several precast prestressed concrete box girders, multiple span passes are required. Erecting bridge girders across railway lines requires multiple span passes, each occurring within a railway maintenance window. This results in a long erection cycle and significant disruption to railway operations. Using a rotating bridge erecting machine allows the entire bridge to be rotated and positioned in one go, eliminating the need for multiple span passes. The erection time is controlled within a single maintenance window, minimizing disruption to railway operations.

[0107] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A prefabricated prestressed concrete box girder rotating bridge erection machine, characterized in that: The rotating bridge erecting machine includes a rotating bridge erecting machine tower (1), a rotating bridge erecting machine cable stay (3), a rotating bridge erecting machine tower lower crossbeam (4), a rotating bridge erecting machine bridge deck beam frame, and a rotating bridge erecting machine lower support leg (8). The tower (1) of the rotating bridge erecting machine is vertically arranged on the top of the lower crossbeam (4) of the tower, and the bridge deck beam of the rotating bridge erecting machine is horizontally arranged below the lower crossbeam (4) of the tower and arranged longitudinally. The cable-stayed bridge erecting machine (3) is symmetrically arranged on both longitudinal sides of the tower (1) of the bridge erecting machine. The top end of the cable-stayed bridge erecting machine (3) is fixed to the side of the tower (1) of the bridge erecting machine, and the bottom end of the cable-stayed bridge erecting machine (3) is fixed to the top of the bridge deck beam of the bridge erecting machine. The lower support leg (8) of the rotating bridge erecting machine is located at the bottom of both ends of the lower crossbeam (4) of the tower of the rotating bridge erecting machine and on both sides of the bridge deck beam of the rotating bridge erecting machine. The bottom of the lower support leg (8) of the rotating bridge erecting machine is provided with an auxiliary rotating component. The bridge deck beam frame of the rotating bridge erecting machine includes mutually perpendicular longitudinal beams (5) and transverse beams (6). The bridge deck longitudinal beams (5) of the rotating bridge erecting machine are arranged in parallel in two rows, and the bridge deck transverse beams (6) of the rotating bridge erecting machine are arranged in several rows between the two longitudinal beams (5); the bridge deck transverse beams (6) of the rotating bridge erecting machine are provided with vertical beam hangers (7), and the bottom of the beam hangers (7) is used to be fixed to the precast prestressed concrete box girder (13) as a whole; the bottom end of the cable-stayed cable (3) of the rotating bridge erecting machine is fixed to the top of the beam hangers (7); The auxiliary rotating component is the sliding wheel (9) of the rotating bridge erecting machine.

2. The prefabricated prestressed concrete box girder rotating bridge erection machine according to claim 1, characterized in that: Two rotating bridge erecting machine towers (1) are arranged side by side in the horizontal direction, and the two rotating bridge erecting machine towers (1) are arranged symmetrically in the horizontal direction on the top of the lower crossbeam (4) of the rotating bridge erecting machine tower. A crossbeam (2) of the rotating bridge erecting machine is provided between the upper parts of the two rotating bridge erecting machine towers (1).

3. The construction method of the prefabricated prestressed concrete box girder rotating bridge erection machine as described in claim 2, characterized in that: The method includes: Construct a rotating pier (16), pour a pier cap beam (14) on top of the rotating pier (16), and install a rotating ball hinge (11) on top of the pier cap beam (14). A rotating bridge pier (16) is erected on the outside of the rotating bridge pier (16), and a ring-shaped rotating bridge pier slide (10) is installed on the top of the rotating bridge pier slide support (15). Assemble the rotating bridge erecting machine and place the rotating bridge erecting machine sliding wheel (9) on the rotating bridge erecting machine sliding track (10); A pad (12) is set between the bridge deck crossbeam (6) of the rotating bridge erecting machine and the prefabricated prestressed concrete box girder (13). The prefabricated prestressed concrete box girder (13) and the rotating bridge erecting machine are temporarily fixed together by the beam hanger (7). The bottom of the precast prestressed concrete box girder (13) contacts the rotating ball joint (11), the sliding wheel (9) of the rotating bridge erecting machine moves on the sliding track (10) of the rotating bridge erecting machine, and the precast prestressed concrete box girder (13) rotates synchronously with the rotating bridge erecting machine.

4. The prefabricated prestressed concrete box girder rotating bridge erection machine according to claim 2, characterized in that: The auxiliary rotating component is the anchorage support (19) on the top of the pier of the rotating bridge erecting machine.

5. The construction method of the prefabricated prestressed concrete box girder rotating bridge erection machine as described in claim 4, characterized in that: The method includes: Construct a lower turntable (21) and an upper turntable (20) for the rotating pier. Install a rotating ball joint (11) on the top of the lower turntable (21) and install a rotating pier support slide (22) between the lower turntable (21) and the upper turntable (20) and around the lower turntable (21). A rotating pier (16) is constructed on the top of the turntable (20) on the rotating pier. A pier cap beam (14) is poured on the top of the rotating pier (16). A precast prestressed concrete box girder (13) is supported on the pier cap beam (14) using temporary supports. Assemble the rotating bridge erecting machine and temporarily fix the pier top anchorage support (19) of the rotating bridge erecting machine to the top of the pier cap beam (14); A pad (12) is set between the bridge deck crossbeam (6) of the rotating bridge erecting machine and the prefabricated prestressed concrete box girder (13). The prefabricated prestressed concrete box girder (13) and the rotating bridge erecting machine are temporarily fixed together by the beam hanger (7). The bottom of the turntable (20) on the rotating pier contacts the rotating ball hinge (11), and the precast prestressed concrete box girder (13), pier cap beam (14), rotating pier (16), and turntable (20) on the rotating pier rotate synchronously with the rotating bridge erecting machine.

6. The method according to claim 3 or 5, characterized in that: After the prefabricated prestressed concrete box girders (13) are hoisted into place, they are arranged longitudinally and in parallel, and the cast-in-place wet joints between adjacent prefabricated prestressed concrete box girders (13) form the entire bridge deck.

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