Connection system for connecting existing track and frame bridge and frame bridge construction method

Abstract

The present invention discloses a connection system for connecting an existing track with a frame bridge and a method for constructing a frame bridge, which solves the technical problem in the prior art of the difficulty in jacking up the frame bridge due to obstruction by load-bearing piles. The connection system for connecting an existing track with a frame bridge comprises: a reinforcement beam disposed below the existing track; a conversion structure disposed between the reinforcement beam and the frame bridge; in the jacking direction of the frame bridge, the conversion structures are arranged at intervals on the top surface of the frame bridge and connected to the reinforcement beam; wherein the conversion structure comprises: a rolling mechanism for rolling along the top surface of the frame bridge during the jacking process of the frame bridge; the rolling mechanism comprises a roller assembly; a connecting mechanism for connecting to the reinforcement beam above the frame bridge; and a supporting mechanism for connecting the rolling mechanism and the connecting mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of frame bridge jacking construction, and in particular to a connection system for connecting an existing track and a frame bridge, and a frame bridge construction method. Background Art

[0002] In road construction, there are often situations where the road has to pass under existing operational railway tracks. To ensure that the railway operation is not affected, the construction method of frame bridge (box culvert) jacking is generally adopted, which requires the reinforcement of the existing operational railway tracks.

[0003] Generally speaking, for existing tracks with a turning radius of 400m or greater, reinforcement structures are typically constructed with D-beams and supporting piles beneath the existing track. Because the D-beams are standard, the corresponding supporting piles are spaced relatively wide apart. During the jacking of the frame bridge, the supporting piles are typically located on both sides of the jacking direction. Therefore, the supporting piles do not hinder the jacking of the frame bridge.

[0004] However, in practice, it has been found that when the track's turning radius R is less than 400m, D-beams are no longer suitable for supporting the existing track. In this case, other beams (such as H-beams) and load-bearing piles are required to ensure effective reinforcement. However, the spacing between the load-bearing piles in this situation is small, which can hinder the jacking of the frame bridge. For this situation, there is no safe and effective construction method in the existing technology. Summary of the Invention

[0005] The main purpose of the present invention is to provide a connection system for connecting an existing track and a frame bridge and a frame bridge construction method, so as to solve the technical problem in the prior art that the frame bridge is difficult to be jacked up due to the obstruction of load-bearing piles.

[0006] In order to achieve the above-mentioned object, the present invention first provides a first connection system for connecting an existing track and a frame bridge, and the technical solution is as follows:

[0007] A connection system connecting an existing track and a frame bridge comprises: a reinforcement beam, which is provided below the existing track; a conversion structure, which is arranged between the reinforcement beam and the frame bridge; in the jacking direction of the frame bridge, the conversion structures are arranged at intervals on the top surface of the frame bridge and connected to the reinforcement beam; wherein the conversion structure comprises: a rolling mechanism, which is used to roll along the top surface of the frame bridge during the jacking process of the frame bridge; the rolling mechanism comprises a roller assembly; a connection mechanism, which is used to connect to the reinforcement beam above the frame bridge; and a support mechanism, which is used to connect the rolling mechanism and the connection mechanism.

[0008] First, the first connection system for connecting existing track to a frame bridge of the present invention significantly enhances the reinforcement of the existing track through the combination of a reinforcement beam and a conversion structure. Second, the rolling mechanism rolls along the top surface of the frame bridge, allowing for smooth advancement of the frame bridge while simultaneously reinforcing the existing track. Therefore, the first connection system for connecting existing track to a frame bridge of the present invention has a simple structure, is easy to use, and provides excellent reinforcement.

[0009] As a further improvement to the present invention, the reinforcement beam comprises first H-shaped steel sections spliced ​​and arranged along the existing track and spaced apart in the jacking direction of the frame bridge, and second H-shaped steel sections spaced apart above the first H-shaped steel sections. The existing track has a turning radius of less than 400m. Thus, the reinforcement beam effectively reinforces the existing track.

[0010] As a further improvement of the present invention, two rows of the conversion structures are provided on each box of the frame bridge in a direction perpendicular to the jacking direction of the frame bridge, thereby making the force on the frame bridge and the existing track more uniform, facilitating reinforcement and jacking construction.

[0011] As a further improvement of the present invention, the roller assemblies are arranged at intervals in the jacking direction of the frame bridge; the rolling mechanism further includes a wheel cover, the roller assemblies are installed in the wheel cover, and the support mechanism is connected to the top surface of the wheel cover. This facilitates processing and manufacturing, and has a good reinforcement effect.

[0012] As a further improvement of the present invention, the support mechanism includes a force-transmitting steel pipe.

[0013] As a further improvement of the present invention, the connecting mechanism includes a force-transmitting steel plate and a bolt assembly, the supporting mechanism is connected to the bottom surface of the force-transmitting steel plate, and the bolt assembly is used to connect the force-transmitting steel plate and the flange of the first H-beam. As a result, the connecting mechanism has a simple structure and is easy to install.

[0014] As a further improvement to the present invention, two connecting mechanisms and two rolling mechanisms are provided below the force-transmitting steel plate. This facilitates fabrication and provides enhanced reinforcement. The bolt assemblies are arranged in two rows perpendicular to the jacking direction of the frame bridge. This facilitates installation of the bolt assemblies and provides a high connection strength between the bolt assemblies and the first H-beam.

[0015] As a further improvement to the present invention, when the jacking direction of the frame bridge forms an angle with the first H-beam, causing the bolt assembly to extend beyond the flange of the first H-beam, an extension plate connected to the bolt assembly is provided at the outer edge of the flange, thereby facilitating installation of the connection mechanism.

[0016] As a further improvement to the present invention, the connection system further includes steel plate slideways provided on the top surface of each box of the frame bridge. During the jacking process of the frame bridge, the roller assembly rolls on the steel plate slideways. This helps reduce the rolling resistance of the steel wheels, thereby significantly reducing the jacking resistance of the frame bridge.

[0017] In order to achieve the above-mentioned purpose, the present invention provides a second connection system for connecting an existing track and a frame bridge, and the technical solution is as follows:

[0018] A connection system connecting an existing track and a frame bridge comprises: a reinforcement beam, which is arranged below the existing track; the reinforcement beam comprises a first H-shaped steel spliced ​​and arranged along the direction of the existing track line and arranged at intervals along the jacking direction of the frame bridge; a conversion structure, which is arranged between the reinforcement beam and the frame bridge; in the jacking direction of the frame bridge, the conversion structures are arranged at intervals on the top surface of the frame bridge and connected to the first H-shaped beam; wherein the conversion structure comprises: a rolling mechanism for rolling along the top surface of the frame bridge during the jacking process of the frame bridge; the rolling mechanism comprises a roller assembly; a connecting mechanism for connecting to the first H-shaped beam above the frame bridge; and a supporting mechanism for connecting the rolling mechanism and the connecting mechanism.

[0019] First, the second connection system for connecting the existing track and the frame bridge of the present invention significantly improves the reinforcement effect of the existing track through the combination of the reinforcement beam and the conversion structure. Secondly, the first H-shaped steel is easy to obtain and the length is easy to adjust. Especially when the frame bridge is pushed in at the turning point of the existing track, the first H-shaped steel can be arranged more in line with the line direction of the existing track, thereby ensuring the reinforcement effect, and has a reinforcement effect that is significantly better than that of the I-beam. In addition, the rolling mechanism can roll along the top surface of the frame bridge, which can smoothly push the frame bridge in while reinforcing the existing track. Therefore, the second connection system for connecting the existing track and the frame bridge of the present invention has a simple structure, is easy to use, and has a good reinforcement effect.

[0020] As a further improvement of the present invention, two rows of the conversion structures are provided on each box of the frame bridge in a direction perpendicular to the jacking direction of the frame bridge.

[0021] As a further improvement of the present invention, the roller assemblies are arranged at intervals in the jacking direction of the frame bridge; the rolling mechanism also includes a wheel cover, the roller assembly is installed in the wheel cover, and the supporting mechanism is connected to the top surface of the wheel cover.

[0022] As a further improvement of the present invention, the support mechanism includes a force-transmitting steel pipe.

[0023] As a further improvement of the present invention, the connecting mechanism includes a force transmission steel plate and a bolt assembly, the supporting mechanism is connected to the bottom surface of the force transmission steel plate, and the bolt assembly is used to connect the force transmission steel plate and the flange of the first H-shaped steel.

[0024] As a further improvement of the present invention, two connecting mechanisms and two rolling mechanisms are provided below the force transmission steel plate; the bolt assemblies are arranged in two rows and in a direction perpendicular to the jacking direction of the frame bridge.

[0025] As a further improvement of the present invention, when the jacking direction of the frame bridge forms an angle with the first H-shaped steel so that the bolt assembly exceeds the flange of the first H-shaped steel, an extension plate connected to the bolt assembly is provided at the outer edge of the flange.

[0026] As a further improvement of the present invention, the reinforcement beam further includes a second H-shaped steel arranged above the first H-shaped steel at intervals.

[0027] As a further improvement of the present invention, the connection system also includes a steel plate slideway provided on the top surface of each box body of the frame bridge, and during the jacking process of the frame bridge, the roller assembly rolls on the steel plate slideway.

[0028] As a further improvement of the present invention, the turning radius of the existing track is less than 400m.

[0029] In order to achieve the above-mentioned object, the present invention further provides a method for constructing a frame bridge under an existing track, and the technical solution is as follows:

[0030] The construction method of a frame bridge passing under an existing track adopts any one of the above-mentioned connection systems for connecting the existing track and the frame bridge, and specifically comprises the following steps:

[0031] Excavate pile holes for bearing piles on both sides of the existing track and install bearing piles;

[0032] Then, a third H-shaped steel is installed above the bearing piles. The third H-shaped steel is spliced ​​and arranged along the direction of the existing track and spaced apart along the jacking direction of the frame bridge.

[0033] Then install the second H-beam above the third H-beam and pass under the existing track;

[0034] During the jacking construction of the frame bridge, when the jacking reaches the side of the bearing pile, the first H-shaped steel and the transfer structure are installed on the top surface of the frame bridge near the bearing pile;

[0035] Break the bearing piles and remove the third H-shaped steel above the bearing piles;

[0036] Continue jacking until it passes under the existing track.

[0037] The present invention's connection system for connecting existing track to a frame bridge, when used, effectively reinforces existing track, particularly existing track with a turning radius of less than 400m, through the combination of a conversion structure and a reinforcement beam, ensuring normal railway operation during construction. Because the combination of the reinforcement beam and conversion structure has such an excellent reinforcement effect, the present invention's connection system is highly practical and is also applicable to existing track with a turning radius of 400m or greater. The conversion structure is installed row by row as the load-bearing piles are removed, and the conversion structure's rolling mechanism is capable of rolling on the top surface of the frame bridge, enabling the conversion structure to support the gap between the frame bridge and the reinforcement beam, thereby effectively reinforcing the existing track without hindering the advancement of the frame bridge and ensuring normal railway operation during construction. As can be seen, the present invention's connection system for connecting existing track to a frame bridge has a simple structure, and the frame bridge construction method using this connection system is simple in process. It effectively solves the technical problem in the prior art of frame bridge advancement being difficult due to obstruction from load-bearing piles. Furthermore, the connection system is reusable, making it highly practical.

[0038] The following is a further description of the embodiments of the invention provided in this specification in conjunction with the accompanying drawings and specific implementation methods. Additional aspects and advantages of the embodiments of the invention provided in this specification will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the embodiments of the invention provided in this specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings that constitute part of the embodiments of the inventions provided in this specification are intended to assist in understanding the embodiments of the inventions provided in this specification. The contents provided in the drawings and their related descriptions in the embodiments of the inventions provided in this specification may be used to explain the embodiments of the inventions provided in this specification, but do not constitute improper limitations on the embodiments of the inventions provided in this specification. In the drawings:

[0040] Figure 1 This is a top view of the connection system for connecting the existing track and the frame bridge according to embodiment 1 of the present invention.

[0041] Figure 2 This is a front view of the connection system for connecting the existing track and the frame bridge according to embodiment 1 of the present invention.

[0042] Figure 3 This is a side view of the connection system for connecting the existing track and the frame bridge according to embodiment 1 of the present invention.

[0043] Figure 4 This is a front view of the conversion structure in the connection system for connecting the existing track and the frame bridge in Example 1 of the present invention.

[0044] Figure 5This is a side view of the conversion structure in the connection system for connecting the existing track and the frame bridge in Example 1 of the present invention.

[0045] Figure 6 This is a top view of the conversion structure in the connection system for connecting the existing track and the frame bridge in Example 1 of the present invention.

[0046] Figure 7 This is a front view of the connection system for connecting the existing track and the frame bridge according to embodiment 2 of the present invention.

[0047] Figure 8 This is a side view of the connection system for connecting the existing track and the frame bridge according to embodiment 3 of the present invention.

[0048] Figure 9 This is a front view of the conversion structure in the connection system for connecting the existing track and the frame bridge in embodiment 4 of the present invention.

[0049] The relevant marks in the above drawings are:

[0050] 110-existing track, 120-frame bridge, 210-first H-beam, 211-extension plate, 220-second H-beam, 230-load-bearing pile, 240-third H-beam, 300-conversion structure, 400-steel plate slide, 310-rolling mechanism, 330-connecting mechanism, 320-support mechanism, 311-steel wheel, 312-wheel core, 313-wheel cover, 321-force transmission steel pipe, 331-force transmission steel plate, 332-bolt assembly. DETAILED DESCRIPTION

[0051] The following is a clear and complete description of the embodiments of the invention provided in this specification in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the embodiments of the invention provided in this specification based on these descriptions. Before describing the embodiments of the invention provided in this specification in conjunction with the accompanying drawings, it should be noted that:

[0052] The technical solutions and technical features provided in each part of the embodiments of the invention provided in this specification, including the following description, can be combined with each other unless there is any conflict.

[0053] In addition, the embodiments of the embodiments of the invention provided in this specification involved in the following description are generally only a part of the embodiments of the invention provided in this specification rather than all the embodiments. Therefore, based on the embodiments of the invention provided in this specification, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the embodiments of the invention provided in this specification.

[0054] Regarding the terms and units in the embodiments of the inventions provided in this specification: The terms "including," "comprising," "having," and any variations thereof in the descriptions and claims of the embodiments of the inventions provided in this specification, and in related sections, are intended to cover non-exclusive inclusions. In addition, other relevant terms and units in the embodiments of the inventions provided in this specification may be reasonably interpreted based on the relevant content of the embodiments of the inventions provided in this specification.

[0055] Example 1

[0056] Figure 1 It is a top view of the connection system connecting the existing track and the frame bridge in this embodiment. Figure 2 It is a front view of the connection system connecting the existing track and the frame bridge in this embodiment. Figure 3 It is a side view of the connection system connecting the existing track and the frame bridge of this embodiment.

[0057] like Figure 1-3 As shown, the connection system between the existing track and the frame bridge includes a reinforcement beam and a conversion structure 300. The turning radius of the existing track 110 is less than 400m. The reinforcement beam is located below the existing track 110 and comprises a first H-beam 210 and a second H-beam 220 located above the first H-beam 210. The first H-beams 210 are arranged in a spliced ​​manner along the existing track 110 and spaced apart along the jacking direction of the frame bridge 120. The second H-beams 220 are spaced apart and form an angle greater than 80° with the first H-beams 210. The second H-beams 220 are arranged between the first H-beams 210 and the rails of the existing track 110. Two rows of conversion structures 300 are installed on each box of the frame bridge 120, perpendicular to the jacking direction of the frame bridge 120. In the jacking direction of the frame bridge 120, the conversion structures 300 are spaced apart on the top surface of the frame bridge 120 and connected to the first H-beams 210.

[0058] The first H-beam 210 and the second H-beam 220 both have a center flange HM600*300mm, a cross-sectional height of 58.8mm, and a width of 30mm. The load-bearing piles 230 are concrete piles with a cross-sectional dimension of 2*2m. The center distance between two adjacent load-bearing piles 230 is 4m.

[0059] Figure 4 This is a front view of the conversion structure in the connection system connecting the existing track and the frame bridge of this embodiment. Figure 5 This is a side view of the conversion structure in the connection system connecting the existing track and the frame bridge of this embodiment. Figure 6 This is a top view of the conversion structure in the connection system connecting the existing track and the frame bridge of this embodiment.

[0060] like Figure 4-6 As shown, the conversion structure 300 includes a rolling mechanism 310, a connecting mechanism 330, and a supporting mechanism 320. The rolling mechanism 310 is used to roll along the top surface of the frame bridge 120 during the jacking process of the frame bridge 120. The rolling mechanism 310 includes a roller assembly and a wheel cover 313. The roller assembly includes a steel wheel 311 and a wheel core 312. The roller assembly is installed in the wheel cover 313, and the wheel cover 313 is provided with a through hole that matches the wheel core 312. In the jacking direction of the frame bridge 120, there are five roller assemblies arranged at intervals. The connecting mechanism 330 is used to connect to the first H-beam 210 above the frame bridge 120. The connecting mechanism 330 includes a force-transmitting steel plate 331 and a bolt assembly 332. The bolt assembly 332 is used to connect the force-transmitting steel plate 331 to the flange of the first H-beam 210. The bolt assemblies 332 are arranged in two rows perpendicular to the jacking direction of the frame bridge 120, with ten bolt assemblies 332 in each row. The supporting mechanism 320 includes a force-transmitting steel pipe 321, the upper and lower ends of which are welded to the top surface of the wheel housing 313 and the bottom surface of the force-transmitting steel plate 331, respectively.

[0061] The steel wheel 311 has a diameter of 10 cm and a length of 20 cm; the wheel core 312 has a diameter of 3 cm. The force transmission steel plate 331 is 1 cm thick. The bolt assemblies 332 use M20*80 mm bolts and M20 nuts, with the center distance between adjacent bolt assemblies 332 being 5 cm. The force transmission steel pipe 321 is a φ21.9*12 mm steel pipe.

[0062] Two connecting mechanisms 330 and two rolling mechanisms 310 are provided below the force transmission steel plate 331 , and the arrangement directions of the two rows of roller assemblies and the two rows of bolt assemblies 332 are perpendicular.

[0063] Example 2

[0064] Figure 7 This is a front view of the connection system for connecting the existing track and the frame bridge according to this embodiment (the second H-shaped steel 220 is not shown).

[0065] On the basis of Example 1, the connection system for connecting the existing track and the frame bridge of this embodiment further has the following configuration: Figure 7 As shown, the connection system further includes a steel plate slide 400 provided on the top surface of each box of the frame bridge 120. The steel plate slide 400 is provided along the jacking direction of the frame bridge 120. During the jacking process of the frame bridge 120, the roller assembly rolls on the steel plate slide 400. The steel plate slide 400 has a thickness of 1 cm and a width of 80 cm.

[0066] Example 3

[0067] Figure 8 This is a side view of the connection system for connecting the existing track and the frame bridge according to this embodiment (the second H-shaped steel 220 is not shown).

[0068] On the basis of Example 1, the connection system for connecting the existing track and the frame bridge of this embodiment further has the following configuration: Figure 8 As shown, when the pushing direction of the frame bridge 120 forms an angle with the first H-shaped steel 210 so that the bolt assembly 332 exceeds the flange of the first H-shaped steel 210, an extension plate 211 connected to the bolt assembly 332 is provided at the outer edge of the flange, and the extension plate 211 is welded to the flange.

[0069] Example 4

[0070] Figure 9 This is a front view of the conversion structure in the connection system connecting the existing track and the frame bridge of this embodiment.

[0071] Compared with Example 1, the connection system for connecting the existing track and the frame bridge in this embodiment has the following differences: Figure 9 As shown, only one connecting mechanism 330 and one rolling mechanism 310 are provided below the force transmission steel plate 331 .

[0072] An embodiment of the method for constructing a frame bridge under an existing track of the present invention is to use the connection system for connecting the existing track and the frame bridge described in any one of the above embodiments, and specifically comprises the following steps:

[0073] Excavating pile holes for bearing piles 230 on both sides of the existing track 110 and installing the bearing piles 230;

[0074] Then, a third H-shaped steel 240 is installed above the bearing pile 230. The third H-shaped steel 240 is spliced ​​and arranged along the line direction of the existing track 110 and spaced apart along the jacking direction of the frame bridge 120.

[0075] Then, the second H-shaped steel 220 is installed above the third H-shaped steel 240 and passes under the existing track 110;

[0076] The frame bridge 120 is jacked up. When the jacking reaches the side of the bearing pile 230, the first H-beam 210 and the conversion structure 300 are installed on the top surface of the frame bridge 120 near the bearing pile 230. In this way, the first H-beam 210 replaces the third H-beam 240 to support the second H-beam 220 and the existing track 110 above.

[0077] Break the bearing pile 230 and remove the third H-shaped steel 240 above the bearing pile 230;

[0078] Continue pushing until it passes through the bottom of the existing track 110.

[0079] The boxes of the frame bridge 120 are jacked in a one-by-one construction manner. When the frame bridge 120 contains 3 or more boxes, the jacking is carried out in an interval construction manner.

[0080] The third H-shaped steel 240 is identical to the first H-shaped steel 210. Therefore, the dismantled third H-shaped steel 240 can remain on the top surface of the frame bridge 120 and be connected to the conversion structure 300 as the first H-shaped steel 210 when it is pushed to the side of the next row of bearing piles 230. It can also be transported to the outside after dismantling.

[0081] After the jacking of the frame bridge 120 is completed, the connection system is removed section by section and the roadbed of the existing track 110 is constructed. The removed connection system can be reused for the jacking construction of the frame bridge 120 in other sections or projects.

[0082] The above describes the relevant contents of the embodiments of the inventions provided in this specification. Based on these descriptions, a person of ordinary skill in the art will be able to implement the embodiments of the inventions provided in this specification. Based on the above contents of the embodiments of the inventions provided in this specification, all other preferred implementations and embodiments obtained by a person of ordinary skill in the art without making any creative effort shall fall within the scope of protection of the embodiments of the inventions provided in this specification.

Claims

1. A connection system for connecting existing tracks and frame bridges, characterized by: include: A reinforcement beam is provided below the existing track (110); the reinforcement beam comprises first H-shaped steels (210) arranged in a spliced ​​arrangement along the line direction of the existing track (110) and arranged at intervals along the jacking direction of the frame bridge (120); and second H-shaped steels (220) arranged at intervals above the first H-shaped steels (210); A conversion structure (300), the conversion structure (300) being arranged between the reinforcement beam and the frame bridge (120); in the jacking direction of the frame bridge (120), the conversion structures (300) are arranged at intervals on the top surface of the frame bridge (120) and connected to the reinforcement beam; Wherein, the conversion structure (300) comprises: A rolling mechanism (310) is used for rolling along the top surface of the frame bridge (120) during the jacking process of the frame bridge (120); the rolling mechanism (310) includes a roller assembly; A connecting mechanism (330) is used to connect to the reinforcement beam above the frame bridge (120); the connecting mechanism (330) includes a force transmission steel plate (331) and a bolt assembly (332); A support mechanism (320) is used to connect the rolling mechanism (310) and the connecting mechanism (330); the support mechanism (320) is connected to the bottom surface of the force transmission steel plate (331), and the bolt assembly (332) is used to connect the force transmission steel plate (331) and the flange of the first H-shaped steel (210); Two connecting mechanisms (330) and two rolling mechanisms (310) are provided below the force transmission steel plate (331); when the jacking direction of the frame bridge (120) forms an angle with the first H-shaped steel (210), causing the bolt assembly (332) to extend beyond the flange of the first H-shaped steel (210), an extension plate (211) connected to the bolt assembly (332) is provided at the outer edge of the flange.

2. The connection system for connecting an existing track and a frame bridge according to claim 1, characterized in that: The turning radius of the existing track (110) is less than 400m.

3. The connection system for connecting an existing track and a frame bridge according to claim 2, wherein: In a direction perpendicular to the jacking direction of the frame bridge (120), two rows of the conversion structures (300) are provided on each box of the frame bridge (120).

4. The connection system for connecting an existing track and a frame bridge according to claim 2, wherein: In the jacking direction of the frame bridge (120), the roller assemblies are arranged at intervals; the rolling mechanism (310) further includes a wheel cover (313), the roller assemblies are installed in the wheel cover (313), and the supporting mechanism (320) is connected to the top surface of the wheel cover (313).

5. The connection system for connecting an existing track and a frame bridge according to claim 2, wherein: The supporting mechanism (320) includes a force-transmitting steel pipe (321).

6. The connection system for connecting an existing track and a frame bridge according to claim 1, wherein: The bolt assemblies (332) are arranged in two rows and in a direction perpendicular to the jacking direction of the frame bridge (120).

7. The connection system for connecting an existing track and a frame bridge according to claim 1, wherein: The connection system further comprises a steel plate slideway (400) provided on the top surface of each box body of the frame bridge (120); during the jacking process of the frame bridge (120), the roller assembly rolls on the steel plate slideway (400).

8. A method for constructing a frame bridge under an existing track, using the connection system for connecting an existing track and a frame bridge according to any one of claims 1 to 7, specifically comprising the following steps: Excavating pile holes for bearing piles (230) on both sides of the existing track (110) and installing the bearing piles (230); Then, a third H-shaped steel (240) is installed above the bearing pile (230), wherein the third H-shaped steel (240) is spliced ​​and arranged along the line direction of the existing track (110) and is arranged at intervals along the jacking direction of the frame bridge (120); Then, a second H-shaped steel (220) is installed above the third H-shaped steel (240) and passes under the existing track (110); The frame bridge (120) is constructed by jacking, and when the jacking reaches the side of the bearing pile (230), a first H-shaped steel (210) and a conversion structure (300) are installed on the top surface of the frame bridge (120) near the bearing pile (230); Breaking the bearing pile (230) and removing the third H-shaped steel (240) above the bearing pile (230); Continue pushing forward until it passes through the bottom of the existing track (110).

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