Combined type steel support for restraining horizontal convergence of shield tunnel and installation method

Abstract

The invention provides a combined steel support for restraining horizontal convergence of a shield tunnel and an installation method, and relates to the technical field of tunnel construction in the civil engineering industry. The device comprises a plurality of ring support supports and a horizontal support, the ring support supports are sequentially spliced to form an arc-shaped frame body with a notch, the horizontal support is located at the notch of the arc-shaped frame body, and the arc-shaped frame body is connected with the horizontal support. The outer wall of the arc-shaped frame body is attached to the bottom and the two side areas of the lower-layer shield tunnel, a gap exists between the horizontal support and the upper end of the lower-layer shield tunnel, and the horizontal support is horizontally arranged in the lower-layer shield tunnel.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction in the civil engineering industry, and in particular to a combined steel support for constraining horizontal convergence of a shield tunnel and an installation method thereof. Background Art

[0002] In situations where roads are narrow or the surrounding environment is complex, the left and right lines of the shield tunnel are often arranged in a vertical stacking arrangement. The excavation sequence is: first construct the lower shield tunnel 10, then the upper shield tunnel 20. The excavation of the upper shield tunnel will cause deformation of the lower shield tunnel segment structure. Engineering practice has shown that under the combined effects of the construction disturbance of the upper shield tunnel and the deadweight of the shield machine, the deformation of the lower shield tunnel is mainly horizontal convergence deformation, causing the clear height of the tunnel to increase and the clear width to decrease, resulting in the lower shield tunnel changing from a circular shape to a vertical elliptical shape, such as Figure 1 shown.

[0003] To reduce the disturbances caused by shield tunneling in the upper tunnel and the impact of the shield machine on the existing tunnel segments below, reinforcement of the existing segments is necessary to enhance their stability. Internal support reinforcement in shield tunnels is a common method for controlling tunnel deformation. However, to date, most internal support measures have been based on the concept of full circumferential reinforcement within the shield tunnel. This involves actively or passively applying a full circumferential load to the tunnel lining within the tunnel to control the tunnel's inward deformation in all directions.

[0004] However, in the case of stacked tunnels, the tunnel will only deform horizontally, but vertically, it will deform vertically. In this case, vertical internal supports are not helpful in controlling tunnel deformation, so only horizontal internal support reinforcement is required. To address this issue, the present invention provides a combined rigid support that constrains the horizontal convergence of shield tunnels, used to horizontally reinforce the tunnel lining and control horizontal convergence. Summary of the Invention

[0005] The present invention aims to provide a combined steel support and installation method for constraining the horizontal convergence of a shield tunnel. The various technical effects that can be achieved by the preferred technical solution among the various technical solutions provided by the present invention are described in detail below.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: The present invention provides a combined steel support for constraining the horizontal convergence of a shield tunnel, comprising a ring support bracket and a horizontal support, wherein the number of the ring support brackets is multiple, and all the ring support brackets are spliced ​​in sequence to form an arc-shaped frame body with a notch, the horizontal support is located at the notch of the arc-shaped frame body and the arc-shaped frame body is connected to the horizontal support, the outer wall of the arc-shaped frame body is attached to the bottom and two side areas of the lower shield tunnel, there is a gap between the horizontal support and the upper end of the lower shield tunnel, and the horizontal support is horizontally arranged in the lower shield tunnel.

[0007] Optionally, the arc-shaped frame includes a bottom ring support bracket and a side ring support bracket, and the number of the bottom ring support bracket and the side ring support bracket are two, the lower end of one side ring support bracket is connected to the upper end of a corresponding bottom ring support bracket, the two ends of the horizontal bracket are respectively connected to the upper ends of the two side ring support brackets, and the lower ends of the two bottom ring support brackets are connected.

[0008] Optionally, the bottom ring support bracket includes a first arc-shaped I-beam and a first connecting plate, there are two first connecting plates, both ends of the first arc-shaped I-beam are fixedly connected to the two first connecting plates respectively, and a first connecting hole is provided on the first connecting plate.

[0009] Optionally, the side ring support bracket includes an upper support section, a middle support section and a lower support section, the arc ends of the upper support section and the lower support section are connected through the middle support section, the vertical ends of the upper support section and the lower support section are connected, the lower end of the lower support section is connected to the upper end of the bottom ring support bracket, and the upper end of the upper support section is connected to the horizontal bracket.

[0010] Optionally, the upper support section includes a second curved I-beam, a first vertical beam, a first connecting beam and a second connecting plate, the lower end of the second curved I-beam is fixedly connected to a second connecting plate, the inner side of the upper end of the second curved I-beam is fixedly connected to the upper end of the first vertical beam, the inner side of the lower end of the second curved I-beam is fixedly connected to the side wall of the first vertical beam through the first connecting beam, the lower end and the upper end side wall of the first vertical beam are fixedly connected to a second connecting plate, and the second connecting plate is provided with a second connecting hole.

[0011] Optionally, the lower support section includes a third curved I-beam, a second vertical beam, a second connecting beam and a third connecting plate, both ends of the third curved I-beam are fixedly connected to a third connecting plate, the inner side of the lower end of the third curved I-beam is fixedly connected to the lower end of the second vertical beam, the inner side of the upper end of the third curved I-beam is fixedly connected to the side wall of the second vertical beam through the second connecting beam, the free end of the second vertical beam is fixedly connected to a third connecting plate, and the third connecting plate is provided with a third connecting hole.

[0012] Optionally, the middle support section includes a fourth arc-shaped I-beam and a fourth connecting plate, there are two fourth connecting plates, both ends of the fourth arc-shaped I-beam are respectively fixedly connected to the two fourth connecting plates, and a fourth connecting hole is provided on the fourth connecting plate.

[0013] Optionally, the horizontal support includes a horizontal I-beam and a fifth connecting plate, and both ends of the horizontal I-beam are fixedly connected to a fifth connecting plate, and the fifth connecting plate is provided with a fifth connecting hole.

[0014] The present invention provides a method for installing a combined steel support for constraining horizontal convergence of a shield tunnel, comprising the following steps: Step S1: first, symmetrically place two bottom ring support brackets at the bottom area of ​​the lower shield tunnel, and connect the two bottom ring support brackets; Step S2: Then, the two lower support sections are respectively placed on the upper ends of the two bottom ring support brackets, and the outer walls of the lower support sections are closely attached to the lower sections of the side wall area of ​​the lower shield tunnel, and then the lower support sections on the same side are connected to the bottom ring support brackets; Step S3: Then, the two middle support segments are respectively placed on the upper ends of the two lower support segments, and the outer walls of the middle support segments are closely attached to the middle sections of the sidewall areas of the lower shield tunnel, and then the middle support segments and the lower support segments on the same side are connected; Step S4: Then, the two upper support segments are respectively placed on the upper ends of the two middle support segments, and the outer walls of the upper support segments are closely attached to the upper sections of the sidewall areas of the lower shield tunnel, and then the upper support segments are respectively connected to the middle support segment and the lower support segment located on the same side; Step S5: Finally, the two ends of the horizontal support are connected to the two upper support sections respectively.

[0015] The present invention provides a combined steel support for constraining the horizontal convergence of a shield tunnel. A plurality of ring-support brackets are sequentially spliced ​​together to form an arc-shaped frame with a gap, and then a horizontal bracket is installed at the gap of the arc-shaped frame. There is a gap between the horizontal bracket and the upper end of the lower shield tunnel. The arc-shaped frame fits tightly with the bottom and the two side areas of the lower shield tunnel, and cooperates with the horizontal bracket to enhance the horizontal stiffness of the lining, share and bear the horizontal load of the tunnel, and control the horizontal inward deformation of the tunnel. It can effectively constrain the disturbance caused by the excavation of the upper shield tunnel and the influence of the shield machine and ancillary equipment on the segment structure of the lower shield tunnel, thereby controlling the horizontal deformation of the segment structure of the lower shield tunnel.

[0016] The preferred technical solution of the present invention can also produce at least the following technical effects: Compared with the traditional full-ring internal support method, the present invention has advantages in terms of material consumption, installation difficulty, space occupation, etc. Specifically: (1) Compared with the traditional full-ring internal support method, the combined steel support of the present invention only performs horizontal lining reinforcement, which not only meets the deformation control requirements of the existing tunnel in the lower layer of the stacked tunnel, but also reduces material consumption and construction costs; (2) Compared with the traditional full-ring inward support method, the combined steel support of the present invention only reinforces the two sides and bottom of the tunnel, and does not need to consider the tunnel arch part which is the most difficult to splice. Therefore, the difficulty of the steel support transportation, lifting and splicing process is greatly reduced, which helps to reduce the difficulty of installation and improve the installation efficiency; (3) Compared with the traditional full-inner support method, the composite steel support of the present invention does not require vertical lining reinforcement, so its vertical beams can be designed close to the tunnel side wall, thereby greatly increasing the space available for workers and equipment to pass through, which helps to reduce the impact of reinforcement measures on normal construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a deformation structure diagram of a shield tunnel in the prior art; Figure 2 This is an exploded view of a combined steel support for constraining horizontal convergence of a shield tunnel provided by an embodiment of the present invention; Figure 3This is a schematic structural diagram of a combined steel support for constraining horizontal convergence of a shield tunnel provided by an embodiment of the present invention; Figure 4 This is a structural diagram of step S1 in a method for installing a combined steel support for constraining horizontal convergence of a shield tunnel provided by an embodiment of the present invention; Figure 5 This is a structural diagram of step S2 in a method for installing a combined steel support for constraining horizontal convergence of a shield tunnel provided by an embodiment of the present invention; Figure 6 This is a structural diagram of step S3 in a method for installing a combined steel support for constraining horizontal convergence of a shield tunnel provided by an embodiment of the present invention; Figure 7 This is a structural diagram of step S4 in a method for installing a combined steel support for constraining horizontal convergence of a shield tunnel provided by an embodiment of the present invention; Figure 8 It is a structural diagram of step S5 in a method for installing a combined steel support for constraining horizontal convergence of a shield tunnel provided by an embodiment of the present invention.

[0019] In the figure, 1 is a horizontal support; 11 is a horizontal I-beam; 12 is a fifth connecting plate; 2. Bottom ring support bracket; 21. First curved I-beam; 22. First connecting plate; 3. Upper support section; 31. Second curved I-beam; 32. First vertical beam; 33. First connecting beam; 34. Second connecting plate; 4. Middle support section; 41. Fourth curved I-beam; 42. Fourth connecting plate; 5. Lower support section; 51. Third curved I-beam; 52. Second vertical beam; 53. Second connecting beam; 54. Third connecting plate; 10. Lower shield tunnel; 20. Upper shield tunnel. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise specified, the term "plurality" means two or more. Terms such as "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," and "tail" are used to indicate positions or relationships based on those shown in the accompanying drawings. These terms are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention depending on the specific circumstances.

[0023] The present invention provides a combined steel support for constraining the horizontal convergence of a shield tunnel, comprising a ring support bracket and a horizontal support 1, wherein there are multiple ring support brackets, all of which are spliced ​​in sequence to form an arc-shaped frame body with a notch, the horizontal support 1 is located at the notch of the arc-shaped frame body and the arc-shaped frame body is connected to the horizontal support 1, the outer wall of the arc-shaped frame body is attached to the bottom and two side areas of the lower shield tunnel 10, there is a gap between the horizontal support 1 and the upper end of the lower shield tunnel 10, and the horizontal support 1 is horizontally arranged in the lower shield tunnel 10. The present invention provides a combined steel support for constraining the horizontal convergence of a shield tunnel. A plurality of ring-support brackets are sequentially spliced ​​to form an arc-shaped frame with a gap, and then a horizontal bracket 1 is installed at the gap of the arc-shaped frame. There is a gap between the horizontal bracket and the upper end of the lower shield tunnel 10. The arc-shaped frame fits tightly with the bottom and both sides of the lower shield tunnel 10, and cooperates with the horizontal bracket to enhance the horizontal stiffness of the lining, share and bear the horizontal load of the tunnel, and control the horizontal inward deformation of the tunnel. It can effectively constrain the excavation disturbance of the upper shield tunnel 20 and the influence of the shield machine and ancillary equipment on the segment structure of the lower shield tunnel, thereby controlling the horizontal deformation of the segment structure of the lower shield tunnel.

[0024] As an optional embodiment, the arc-shaped frame includes a bottom ring support bracket 2 and a side ring support bracket. The number of the bottom ring support bracket 2 and the side ring support bracket is two. The lower end of each side ring support bracket is connected to the upper end of a corresponding bottom ring support bracket 2. The two ends of the horizontal support 1 are respectively connected to the upper ends of the two side ring support brackets, and the lower ends of the two bottom ring support brackets 2 are connected. The two bottom ring support brackets 2 and the two side ring support brackets are symmetrically arranged in the lower shield tunnel 10 to provide support. The outer wall of the bottom ring support bracket 2 is tightly fitted with the bottom area of ​​the lower shield tunnel 10, and the side ring support brackets are tightly fitted with the side areas of the lower shield tunnel 10.

[0025] As an optional embodiment, the bottom ring support bracket 2 includes a first curved I-beam 21 and a first connecting plate 22, the number of the first connecting plates 22 is two, the two ends of the first curved I-beam 21 are fixedly connected to the two first connecting plates 22 respectively, and the first connecting plate 22 is provided with a first connecting hole, the number of the first connecting holes is at least four, distributed at the four end corners of the first connecting plate 22, the first connecting plates 22 at the lower ends of the two first curved I-beams 21 are connected to each other and the corresponding first connecting holes are connected by bolts and nuts, the first connecting plate 22 at the upper end of the first curved I-beam 21 is connected to the third connecting plate 54 at the lower end of the third curved I-beam 51, and the first connecting hole and the corresponding third connecting hole are connected by bolts and nuts.

[0026] As an optional embodiment, the side ring support bracket includes an upper support section 3, a middle support section 4 and a lower support section 5, the arc ends of the upper support section 3 and the lower support section 5 are connected through the middle support section 4, the vertical ends of the upper support section 3 and the lower support section 5 are connected, the lower end of the lower support section 5 is connected to the upper end of the bottom ring support bracket 2, and the upper end of the upper support section 3 is connected to the horizontal bracket 1.

[0027] As an optional embodiment, the upper support section 3 includes a second curved I-beam 31, a first vertical beam 32, a first connecting beam 33 and a second connecting plate 34. The lower end of the second curved I-beam 31 is fixedly connected to a second connecting plate 34, the inner side of the upper end of the second curved I-beam 31 is fixedly connected to the upper end of the first vertical beam 32, and the inner side of the lower end of the second curved I-beam 31 is fixedly connected to the side wall of the first vertical beam 32 through the first connecting beam 33. The length of the first connecting beam 33 is relatively short, so that the first vertical beam 32 will be as close as possible to the side area of ​​the lower shield tunnel 10, thereby greatly increasing the space available for workers and equipment to pass through. The lower end and the upper end side wall of the first vertical beam 32 are fixedly connected to a second connecting plate 34, and the second connecting plate 34 is provided with a second connecting hole. The number of the second connecting holes is at least four, distributed at the four end corners of the second connecting plate 34.

[0028] As an optional embodiment, the lower support section 5 includes a third curved I-beam 51, a second vertical beam 52, a second connecting beam 53 and a third connecting plate 54. Both ends of the third curved I-beam 51 are fixedly connected to a third connecting plate 54. The inner side of the lower end of the third curved I-beam 51 is fixedly connected to the lower end of the second vertical beam 52. The inner side of the upper end of the third curved I-beam 51 is fixedly connected to the side wall of the second vertical beam 52 through the second connecting beam 53. The length of the second connecting beam 53 is relatively short, so that the second vertical beam 52 will be as close as possible to the side area of ​​the lower shield tunnel 10, thereby greatly increasing the space available for workers and equipment to pass through. The free end of the second vertical beam 52 is fixedly connected to a third connecting plate 54, and the third connecting plate 54 is provided with a third connecting hole. The number of the third connecting holes is at least four, distributed at the four end corners of the third connecting plate 54. The third connecting plate 54 on the second vertical beam 52 is connected to the second connecting plate 34 at the lower end of the first vertical beam 32, and the third connecting hole and the corresponding second connecting hole are connected by bolts and nuts. The second vertical beam 52 and the first vertical beam 32 are connected to form a vertical beam providing a vertical direction.

[0029] As an optional embodiment, the middle support section 4 includes a fourth curved I-beam 41 and a fourth connecting plate 42. There are two fourth connecting plates 42. The two ends of the fourth curved I-beam 41 are fixedly connected to the two fourth connecting plates 42 respectively. The fourth connecting plate 42 is provided with fourth connecting holes. There are at least four fourth connecting holes distributed at the four end corners of the fourth connecting plate 42. The fourth connecting plate 42 at the upper end of the fourth curved I-beam 41 is connected to the second connecting plate 34 on the second curved I-beam 31, and the fourth connecting hole is connected to the corresponding second connecting hole by bolts and nuts. The fourth connecting plate 42 at the lower end of the fourth curved I-beam 41 is connected to the third connecting plate 54 at the upper end of the third curved I-beam 51, and the fourth connecting hole is connected to the corresponding third connecting hole by bolts and nuts.

[0030] As an optional embodiment, the horizontal support 1 includes a horizontal I-beam 11 and a fifth connecting plate 12. A fifth connecting plate 12 is fixedly connected to each end of the horizontal I-beam 11. The fifth connecting plate 12 is provided with at least four fifth connecting holes, which are distributed at the four end corners of the fifth connecting plate 12. The second connecting plate 34 on the side wall of the first vertical beam 32 is connected to the fifth connecting plate 12 at the end of the horizontal I-beam 11, and the second connecting hole is connected to the corresponding fifth connecting hole by bolts and nuts.

[0031] The present invention provides a method for installing a combined steel support for constraining horizontal convergence of a shield tunnel, comprising the following steps: Step S1: First, two bottom ring support brackets 2 are symmetrically placed in the bottom area of ​​the lower shield tunnel 10, and the two bottom ring support brackets 2 are connected, that is, the first connecting plates 22 at the lower ends of the two first curved I-beams 21 are connected relative to each other and connected with bolts and nuts; Step S2: Then, the two lower support sections 5 are respectively placed on the upper ends of the two bottom ring support brackets 2, and the outer walls of the lower support sections 5 are close to the lower section of the side wall area of ​​the lower shield tunnel 10, and then the lower support section 5 on the same side is connected to the bottom ring support bracket 2, that is, the first connecting plate 22 at the upper end of the first curved I-beam 21 is connected to the third connecting plate 54 at the lower end of the third curved I-beam 51 and connected with bolts and nuts; Step S3: Next, the two middle support segments 4 are placed on the upper ends of the two lower support segments 5, respectively, and the outer walls of the middle support segments 4 are closely attached to the middle sections of the sidewalls of the lower shield tunnel 10. The middle support segments 4 and the lower support segments 5 on the same side are then connected, that is, the fourth connecting plate 42 at the lower end of the fourth curved I-beam 41 is connected to the third connecting plate 54 at the upper end of the third curved I-beam 51 and connected with bolts and nuts. Step S4: Then, the two upper support segments 3 are respectively placed on the upper ends of the two middle support segments 4, and the outer walls of the upper support segments 3 are closely attached to the upper sections of the sidewall areas of the lower shield tunnel 10. The upper support segments 3 are then connected to the middle support segments 4 and the lower support segments 5 located on the same side, respectively. That is, the fourth connecting plate 42 at the upper end of the fourth curved I-beam 41 is connected to the second connecting plate 34 on the second curved I-beam 31 and connected with bolts and nuts, and the third connecting plate 54 on the second vertical beam 52 is connected to the second connecting plate 34 at the lower end of the first vertical beam 32 and connected with bolts and nuts. Step S5: Finally, connect the two ends of the horizontal bracket 1 to the two upper support sections 3 respectively, that is, connect the second connecting plate 34 on the side wall of the first vertical beam 32 to the fifth connecting plate 12 at the end of the horizontal I-beam 11 and connect them with bolts and nuts.

[0032] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A combined steel support for constraining horizontal convergence of a shield tunnel, characterized in that: It comprises a ring support and a horizontal support (1), wherein: The number of the ring support brackets is multiple, and all the ring support brackets are spliced ​​in sequence to form an arc-shaped frame body with a gap. The horizontal bracket (1) is located at the gap of the arc-shaped frame body and the arc-shaped frame body is connected to the horizontal bracket (1). The outer wall of the arc-shaped frame body is attached to the bottom and two side areas of the lower shield tunnel (10). There is a gap between the horizontal bracket (1) and the upper end of the lower shield tunnel (10) and the horizontal bracket (1) is horizontally arranged in the lower shield tunnel (10) (10).

2. The combined steel support for constraining horizontal convergence of a shield tunnel according to claim 1, characterized in that: The arc-shaped frame body comprises a bottom ring support bracket (2) and a side ring support bracket, wherein the number of the bottom ring support bracket (2) and the number of the side ring support bracket are both two, the lower end of one side ring support bracket is connected to the upper end of a corresponding bottom ring support bracket (2), the two ends of the horizontal bracket (1) are respectively connected to the upper ends of the two side ring support brackets, and the lower ends of the two bottom ring support brackets (2) are connected.

3. The combined steel support for constraining horizontal convergence of a shield tunnel according to claim 2, characterized in that: The bottom ring support bracket (2) comprises a first arc-shaped I-beam (21) and a first connecting plate (22), wherein the number of the first connecting plates (22) is two, and both ends of the first arc-shaped I-beam (21) are respectively fixedly connected to the two first connecting plates (22), and the first connecting plates (22) are provided with a first connecting hole.

4. The combined steel support for constraining horizontal convergence of a shield tunnel according to claim 2, characterized in that: The side ring support bracket comprises an upper support section (3), a middle support section (4) and a lower support section (5), the arc ends of the upper support section (3) and the lower support section (5) are connected through the middle support section (4), the vertical ends of the upper support section (3) and the lower support section (5) are connected, the lower end of the lower support section (5) is connected to the upper end of the bottom ring support bracket (2), and the upper end of the upper support section (3) is connected to the horizontal bracket (1).

5. The combined steel support for constraining horizontal convergence of a shield tunnel according to claim 4, characterized in that: The upper support section (3) comprises a second curved I-beam (31), a first vertical beam (32), a first connecting beam (33) and a second connecting plate (34), wherein the lower end of the second curved I-beam (31) is fixedly connected to the second connecting plate (34), the inner side of the upper end of the second curved I-beam (31) is fixedly connected to the upper end of the first vertical beam (32), the inner side of the lower end of the second curved I-beam (31) is fixedly connected to the side wall of the first vertical beam (32) via the first connecting beam (33), the lower end and the upper end side wall of the first vertical beam (32) are both fixedly connected to the second connecting plate (34), and the second connecting plate (34) is provided with a second connecting hole.

6. The combined steel support for constraining horizontal convergence of a shield tunnel according to claim 4, characterized in that: The lower support section (5) comprises a third curved I-beam (51), a second vertical beam (52), a second connecting beam (53) and a third connecting plate (54), wherein both ends of the third curved I-beam (51) are fixedly connected to a third connecting plate (54), the inner side of the lower end of the third curved I-beam (51) is fixedly connected to the lower end of the second vertical beam (52), the inner side of the upper end of the third curved I-beam (51) is fixedly connected to the side wall of the second vertical beam (52) via the second connecting beam (53), the free end of the second vertical beam (52) is fixedly connected to a third connecting plate (54), and the third connecting plate (54) is provided with a third connecting hole.

7. The combined steel support for constraining horizontal convergence of a shield tunnel according to claim 4, characterized in that: The middle support section (4) comprises a fourth arc-shaped I-beam (41) and a fourth connecting plate (42), wherein the number of the fourth connecting plates (42) is two, and both ends of the fourth arc-shaped I-beam (41) are respectively fixedly connected to the two fourth connecting plates (42), and the fourth connecting plates (42) are provided with fourth connecting holes.

8. The combined steel support for constraining horizontal convergence of a shield tunnel according to claim 1, characterized in that: The horizontal support (1) comprises a horizontal I-beam (11) and a fifth connecting plate (12), wherein both ends of the horizontal I-beam (11) are fixedly connected to the fifth connecting plate (12), and the fifth connecting plate (12) is provided with a fifth connecting hole.

9. A method for installing a combined steel support for constraining horizontal convergence of a shield tunnel according to any one of claims 1 to 8, characterized in that: The following steps are included: Step S1: first, symmetrically placing two bottom ring support brackets (2) in the bottom area of ​​the lower shield tunnel (10), and connecting the two bottom ring support brackets (2); Step S2: Then, the two lower support sections (5) are respectively placed on the upper ends of the two bottom ring support brackets (2), and the outer walls of the lower support sections (5) are closely attached to the lower section of the side wall area of ​​the lower shield tunnel (10), and then the lower support section (5) located on the same side is connected to the bottom ring support bracket (2); Step S3: Then, the two middle support sections (4) are respectively placed on the upper ends of the two lower support sections (5), and the outer walls of the middle support sections (4) are closely attached to the middle section of the side wall area of ​​the lower shield tunnel (10), and then the middle support section (4) and the lower support section (5) located on the same side are connected; Step S4: Then, the two upper support segments (3) are respectively placed on the upper ends of the two middle support segments (4), and the outer walls of the upper support segments (3) are closely attached to the upper portion of the side wall area of ​​the lower shield tunnel (10), and then the upper support segments (3) are respectively connected to the middle support segment (4) and the lower support segment (5) located on the same side; Step S5: Finally, the two ends of the horizontal support (1) are connected to the two upper support sections (3) respectively.

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