A large and small shield connection structure

Abstract

The present application relates to a kind of size shield connection structure, including large shield diameter shield tunnel, two small shield diameter shield tunnels and conversion station, two station main lines are arranged in horn mouth in conversion station, the interval main line in two small shield diameter shield tunnels is connected with the large line distance end of horn mouth respectively, the interval main line in large shield diameter shield tunnel is connected with the small line distance end of horn mouth respectively, and side platform is respectively arranged in two station main lines side.This application completes the connection conversion of size shield in station range to meet the engineering demand of shield tunnel crossing large river etc., avoids the conversion form of traditional conversion well, can reduce engineering construction difficulty and construction cost.Furthermore, one of side platforms can be arranged between two station main lines, which can significantly reduce the width of station, thereby significantly reducing the scale of station and engineering investment, and avoiding the problems of large station scale and high investment caused by arranging side platform on both sides of main line.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of rail transit engineering, and particularly relates to a large-small shield connection structure. BACKGROUND

[0002] The shield method is a commonly used underground construction method in urban rail transit, and is widely used due to the advantages of less ground disturbance, low noise, and less impact on surrounding buildings and structures. The general form of the shield is single-hole single-line, commonly known as small shield, and the line spacing is 2 times the shield diameter (generally about 13m). When crossing a large river or lake, considering factors such as fresh air exchange, smoke exhaust ventilation, and safety evacuation, a large shield in the form of single-hole double-line is used, and the line spacing is generally about 5.3m.

[0003] In actual design, there are cases where a large shield and a small shield are connected, such as a rail transit line crossing the Yangtze River, which will complete the conversion of the large shield and the small shield before crossing the river. A large-small shield conversion shaft is usually set up in the river-crossing section. The conversion shaft is a deep foundation pit due to the proximity to the river, and has high investment and ground disturbance. SUMMARY

[0004] The present application relates to a large-small shield connection structure, which can at least solve some defects of the prior art.

[0005] The present application relates to a large-small shield connection structure, which includes a large-diameter shield tunnel and two small-diameter shield tunnels, and further includes a conversion station. Two station main lines are arranged in a horn mouth shape in the conversion station. The interval main lines in the two small-diameter shield tunnels are connected to the large-line-spacing end of the horn mouth, respectively. The two interval main lines in the large-diameter shield tunnel are connected to the small-line-spacing end of the horn mouth, respectively. Side platforms are arranged beside the two station main lines, respectively.

[0006] As one of the embodiments, one of the side platforms is arranged between the two station main lines.

[0007] As one of the embodiments, the two station main lines each include a curved segment main line. From the direction of the small-diameter shield tunnel to the large-diameter shield tunnel, the line spacing between the two curved segment main lines gradually decreases.

[0008] As one of the embodiments, the two ends of the curved segment main line are connected to the corresponding interval main lines through straight segment main lines, respectively.

[0009] As one of the embodiments, the side platforms correspond to curved platforms arranged adjacent to the curved segment main lines.

[0010] The present application has at least the following beneficial effects:

[0011] The application provides a large-small shield connection structure, which adopts a horn mouth type arrangement of two station main lines in a side station to complete the connection and conversion between large and small shields, that is, the connection and conversion of the large and small shields are completed in the station to meet the engineering requirements of the shield tunnel crossing a large river or a large river, avoids the conversion form of the traditional conversion well, reduces the engineering construction difficulty and construction cost, improves the construction efficiency, effectively shortens the construction period and reduces the engineering investment.

[0012] The application further has the following beneficial effects:

[0013] By arranging one of the side platforms between the two station main lines, the space in the horn mouth is fully utilized, the station width is obviously reduced, the station scale is significantly reduced, the engineering investment is reduced, and the problems of large station scale and high investment caused by arranging the side platform on the two sides of the main line in the conventional side station are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative labor.

[0015] Figure 1 FIG. 1 is a structural form schematic diagram of the large-small shield connection structure provided by the embodiment of the application;

[0016] Figure 2 FIG. 2 is another structural form schematic diagram of the large-small shield connection structure provided by the embodiment of the application. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the application.

[0018] As Figure 1 and Figure 2 The embodiment of the application provides a large-small shield connection structure, which comprises a large shield diameter shield tunnel 1 and two small shield diameter shield tunnels 2, further comprises a conversion station 3, two station main lines 32 in the conversion station 3 are arranged in a horn mouth type, the interval main lines in the two small shield diameter shield tunnels 2 are connected with the large line distance end of the horn mouth respectively, the two interval main lines in the large shield diameter shield tunnel are connected with the small line distance end of the horn mouth respectively, and the two station main lines 32 are respectively provided with a side platform 31.

[0019] The large-shield tunnel 1 can be a river-crossing / river-passing tunnel, two section main lines are laid in the large-shield tunnel 1, and the line spacing between the two section main lines is short; one section main line is laid in each small-shield tunnel 2, and generally the section main lines in the two small-shield tunnels 2 are parallel to each other. In order to realize smooth operation of rail transit, the connection between the two section main lines in the large-shield tunnel 1 and the two section main lines in the two small-shield tunnels 2 needs to be realized, and the connection is realized by the two station main lines 32 in the transfer station 3.

[0020] It can be understood that, in the trumpet-shaped arrangement of the two station main lines 32, the line spacing between the two station main lines 32 in at least part of the section is gradually changed to meet the transition requirement from the two section main lines with large line spacing to the two section main lines with small line spacing.

[0021] In one embodiment, as Figure 1 , the two station main lines 32 each include a curved section main line, and the line spacing between the two curved section main lines gradually decreases from the direction of the small-shield tunnel 2 to the large-shield tunnel 1. The curved arrangement of the station main line 32 ensures the smoothness and safety of the rail transit train operation under the premise of completing the above-mentioned main line conversion. Among them, the two curved section main lines can be directly connected with the corresponding section main lines, but more preferably the two ends of the curved section main line are connected with the corresponding section main lines through straight section main lines. Correspondingly, the side platform 31 is a curved platform 31 arranged adjacent to the curved section main line.

[0022] The large-shield connection structure provided in the embodiment realizes the connection and conversion between the large-shield and the small-shield by arranging the two station main lines 32 in the side station in a trumpet-shaped manner, that is, the connection and conversion between the large-shield and the small-shield is realized within the station to meet the engineering requirement of the shield tunnel crossing a large river or a large river, avoiding the conversion form of the traditional conversion shaft, reducing the engineering construction difficulty and construction cost, improving the construction efficiency, effectively shortening the construction period and reducing the engineering investment.

[0023] Further preferably, as Figure 2 , one side platform 31 is arranged between the two station main lines 32, and the entire station is arranged similar to a knife shape. Based on this structure, the space in the trumpet is fully utilized, which can significantly reduce the width of the station, thereby significantly reducing the size of the station and reducing the engineering investment, and avoiding the problems of large station size and high investment caused by arranging the side platform 31 on both sides of the main line 32 in the conventional side station.

[0024] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A structure for connecting large and small shield tunnels, comprising a large-diameter shield tunnel and two small-diameter shield tunnels, characterized in that: It also includes a transfer station, where the two main lines within the station are arranged in a funnel shape. The main lines in the two small-diameter shield tunnels are respectively connected to the large-spacing end of the funnel, and the two main lines in the large-diameter shield tunnels are respectively connected to the small-spacing end of the funnel. Side platforms are provided next to the two main lines within the station; the side platforms are arranged at the large-spacing end of the funnel. Among them, the large-diameter shield tunnel is a river-crossing tunnel; One of the side platforms is located between the two main lines within the station, making the entire station layout resemble a knife shape; Both main lines within the station include curved sections. From the small-diameter shield tunnel to the large-diameter shield tunnel, the spacing between the two curved sections gradually decreases. The side platform corresponds to the curved platform arranged adjacent to the main line of the curved section.

2. The large and small shield tunneling connection structure as described in claim 1, characterized in that: The two ends of the curve segment mainline are respectively connected to the corresponding interval mainline through the straight line segment mainline.

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