Corrosion-resistant and deformation-adjustable shield tunnel split ring beam and using method thereof

Abstract

The invention belongs to the technical field of urban rail equipment, and discloses a corrosion-resistant and deformation-adjustable shield tunnel split ring beam and a using method thereof.The split ring beam is in a square shape formed by splicing four L-shaped square steel in an end-to-end mode and connected with permanent steel pipe pieces through bolts; displacement meters are respectively arranged on the permanent steel pipe sheets adjacent to the upper, lower, left and right sides of the split ring beam; an inserting part is formed at one end of each L-shaped square steel, an inserting groove allowing the inserting part to be inserted is formed in the other end of each L-shaped square steel, and every two adjacent L-shaped square steels are connected in a pluggable mode through the inserting parts and the inserting grooves; a servo jack used for adjusting the distance between the two pieces of L-shaped square steel is connected between the surfaces of the two pieces of adjacent L-shaped square steel, the two ends of the servo jack are each connected with a supporting piece, and the two supporting pieces are fixedly connected to the surfaces of the two pieces of adjacent L-shaped square steel respectively. The method is applied to the shield tunnel segment holing scene, the stability of the shield segment in the shield tunnel holing process is improved, and the construction risk can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of urban rail equipment, and in particular relates to a corrosion-resistant and deformable shield tunnel opening ring beam and a method of using the same, which is suitable for research on trenchless technology based on the shield method in subway stations with confined spaces in complex environments. Background Art

[0002] With the continuous expansion of urban rail transit networks, the design and construction of these lines face multiple severe challenges. Due to heavy traffic on urban arterial roads, subway construction space is severely limited. Conventional open-cut construction of stations and ancillary structures would require the extensive demolition and relocation of buildings within the construction area, and even traffic closures. This would significantly impact the lives and travel of surrounding residents, leading to significant uncertainty in the subway construction schedule. Therefore, shield tunneling station technology is being considered in this context. For shield tunneling stations, there is a need for connectivity between the main station and ancillary structures, or between dual-island stations, requiring the drilling of shield segments. The mechanical mechanism of shield segment drilling is complex, and the construction process is highly risky. This is especially true during the period between segment drilling and internal support removal, when the segment integrity is compromised and the open ring segments are not yet tightly integrated with the connecting passages, resulting in structural instability in the tunnel.

[0003] However, the ring beams of existing shield tunnel openings are usually cast in situ, which have problems such as a long time for the ring beam to reach strength, difficulty in ensuring the reliability of the cast-in-situ structure, and unstable segment structure during the casting process. At the same time, during the construction of existing shield tunnel openings, grid steel frames are usually used to support the entire ring of segments at the opening. However, the deformation and stress of the segments are in dynamic change during the opening process, and it is difficult to adjust the tunnel support system through the grid steel frames. The support system is difficult to adapt to the dynamic changes in segment stress and displacement, and the structural safety is not high. In addition, during the tunnel opening process, the cantilever end of the segment opening usually undergoes large deformation, and the sudden decrease in the axial force of the segment in the circumferential direction and the increase in the bending moment will affect the structural safety of the segment. The existing support system lacks strong support for the segment opening. Summary of the Invention

[0004] In response to the defects of the above-mentioned existing technologies, the technical problem to be solved by the present invention is to provide a corrosion-resistant and adjustable deformation shield tunnel opening ring beam and a method of using the same, which is used in the shield tunnel segment opening scenario to improve the stability of the shield segments during the shield tunnel opening process, reduce construction risks, and has broad application prospects, high market value and social and economic benefits.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical measures:

[0006] The corrosion-resistant and adjustable deformable open ring beam of a shield tunnel of the present invention is composed of four L-shaped square steels spliced ​​end to end into a "mouth" shape, and connected to permanent steel pipe segments by bolts, and a displacement meter is installed on each of the permanent steel pipe segments adjacent to the upper, lower, left and right sides of the open ring beam; one end of the L-shaped square steel is formed with an insertion portion, and the other end thereof has a slot for inserting the insertion portion, and two adjacent L-shaped square steels are connected by plugging and unplugging through the insertion portion and the slot; a servo jack for adjusting the distance between the two adjacent L-shaped square steels is connected between the surfaces of the two adjacent L-shaped square steels, and each end of the servo jack is connected to a support member, and the two support members are respectively fixedly connected to the surfaces of the two adjacent L-shaped square steels.

[0007] Preferably, the interior of the L-shaped square steel is hollow, and a rib for increasing the overall stiffness of the open ring beam is welded to the hollow cavity inside the L-shaped square steel, and a circular hole is provided on the rib.

[0008] Furthermore, the support member is composed of an L-shaped end plate and a triangular rib plate, and the triangular rib plate is connected to the corners of the L-shaped end plate.

[0009] Furthermore, the bottom plate of the L-shaped end plate is fixedly connected to the surface of the open ring beam by bolts.

[0010] Preferably, the open ring beam uses weathering steel as a base material, and its surface is subjected to zinc infiltration treatment.

[0011] Accordingly, the method for using the corrosion-resistant and adjustable-deformation shield tunnel opening ring beam of the present invention comprises the following steps:

[0012] Step S1: Connect the L-shaped square steel of the 1 / 4 open ring beam end to end to assemble into an "O"-shaped open ring beam;

[0013] Step S2: During the shield segment opening process, after the temporary steel segments of the tunnel are removed, the prefabricated open ring beam is fixedly connected to the permanent steel segments at the opening by bolts;

[0014] Step S3: Fix the support members of the servo jack to the open ring beam in the "up", "down", "left" and "right" directions by bolts, and fix the servo jack between two adjacent open ring beams;

[0015] Step S4: fixing displacement meters on permanent steel segments adjacent to the open ring beam to measure the horizontal and vertical displacements of the permanent steel segments at the opening;

[0016] Step S5: During the subsequent construction process of the shield tunneling, the horizontal and vertical displacements of the permanent steel pipe segments at the opening are monitored in real time by displacement meters. If the horizontal or vertical position value of the permanent steel pipe segment exceeds the control value, the horizontal or vertical servo jack is quickly activated to push the segment forward, so as to control the displacement value of the permanent steel pipe segment within a safe and controllable range.

[0017] Step S6: After the shield tunneling construction is completed, the supports on the open ring beam, the servo jacks, and the displacement gauges on the permanent steel pipe segments are removed, and cement mortar is poured into the interior of the open ring beam through the bolt holes on the open ring beam to fill it tightly. The open ring beam will later serve as a permanent component of the shield tunnel and will be cast together with the connecting channel.

[0018] In this invention, after the temporary steel segments of the shield tunnel are removed, an open ring beam is quickly installed at the opening to provide support. The open ring beam is capable of vertical and horizontal displacement. During the shield segment opening process, the displacement of the open ring beam is adjusted in real time via servo jacks, in conjunction with tunnel opening monitoring data. This ensures that the stress and displacement of the segments remain relatively stable throughout the opening process, improving construction safety. Furthermore, the open ring beam is made of weathering steel with a surface treatment of zinc for improved corrosion resistance, making it suitable for use as a permanent tunnel structure.

[0019] Compared with the prior art, the present invention has the following advantages and effects:

[0020] 1. The use of prefabricated steel ring beam structure, assembled on the permanent steel segment, can quickly stabilize the deformation of the segment opening, facilitate rapid construction, and improve the safety of the shield segment opening process. At the same time, the steel ring beam will serve as a permanent structure at the tunnel opening in the later stage, with high reliability.

[0021] 2. The open ring beam can produce a certain displacement in both vertical and horizontal directions. During the shield segment opening process, the tunnel opening ring segments are monitored and the displacement of the open ring beam is adjusted in real time through the servo jack to ensure the relative stability of the segment force and displacement during the opening process, thereby improving construction safety.

[0022] 3. Weathering steel is used as the base material of the shield segment open ring beam, which has good economy and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions 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.

[0024] Figure 1 A schematic diagram of an open ring beam of the present invention installed in an opening;

[0025] Figure 2 This is the cross-sectional view of the shield tunnel opening;

[0026] Figure 3 A plan view of the open ring beam and servo jack of the present invention;

[0027] Figure 4 This is a schematic structural diagram of the L-shaped square steel of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the support member of the present invention. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] like Figures 1 to 5 As shown, the corrosion-resistant and adjustable-deformation shield tunnel opening ring beam of the present invention is composed of four L-shaped square steels 10 spliced ​​end to end into a "mouth" shape, and is connected to the permanent steel pipe segments 20 by bolts 70.

[0031] The open ring beam is a rectangular cross-section beam that is similar to a square. It is connected to the permanent steel pipe segment 20 by bolts during installation. Figure 2 A servo jack 40 is arranged on the upper, lower, left and right sides of the open ring beam. The servo jack 40 has the function of adjusting the ejection distance. Figure 3 A servo jack 40 is connected between the surfaces of two adjacent L-shaped square steels 10 to adjust the distance between the two L-shaped square steels 10. A support member 50 is connected to each end of the servo jack 40. The two support members 50 are respectively fixedly connected to the surfaces of the two adjacent L-shaped square steels 10. The support member 50 is composed of an L-shaped end plate 51 and a triangular rib 52. The triangular rib 52 is connected to the corners of the L-shaped end plate 51. The bottom plate of the L-shaped end plate 51 is fixedly connected to the surface of the open ring beam by bolts 70.

[0032] A displacement meter 30 is installed on each of the permanent steel segments 20 adjacent to the upper, lower, left, and right sides of the open ring beam. The upper and lower sides are vertical displacement meters, while the left and right sides are horizontal displacement meters. These meters are used to monitor the displacement changes of the permanent steel segments 20 at the opening in real time. It should be noted that the left and right directions in this application refer to the depth of the tunnel.

[0033] Specifically, one end of the L-shaped square steel 10 forms an insertion part, and the other end has a slot for the insertion part to be inserted. The adjacent two L-shaped square steels 10 are connected by plugging and unplugging through the insertion part and the slot. The insertion part at one end of the L-shaped square steel of the open-ring beam can be reduced in size at the end to facilitate insertion into the interior of one end of another L-shaped square steel, as shown in Figure 4 . The interior of the L-shaped square steel 10 is hollow, and the hollow cavity inside the L-shaped square steel is increased in the overall stiffness of the open-ring beam by welding rib plates 60. Round holes are provided on the rib plates 60 so that the internal cavities of the L-shaped square steels can be connected, facilitating the later filling of cement mortar inside the L-shaped square steels.

[0034] The usage method of the corrosion-resistant and deformable-adjustable open-ring beam of the shield tunnel of the present invention includes the following steps:

[0035] Step 1: Connect the L-shaped square steels 10 at the ends of the 1 / 4 open-ring beam end to end to assemble an open-ring beam in the shape of a "mouth".

[0036] Step 2: During the process of opening a hole in the shield segment, after the temporary steel segment of the tunnel is removed, fix the prefabricated open-ring beam to the permanent steel segment 20 at the opening through bolts, and the open-ring beam serves to support the segments at the opening.

[0037] Step 3: Fix the support members of the servo jack 40 to the "top", "bottom", "left", and "right" directions of the open-ring beam through bolts, and fix the servo jack 40 between two adjacent open-ring beams.

[0038] Step 4: Fix the displacement gauges 30 to the permanent steel segments 20 adjacent to the periphery of the open-ring beam to measure the horizontal and vertical displacements of the permanent steel segments 20 at the opening. <0​​​​​​The present invention presents a corrosion-resistant, adjustable-deformation shield tunnel open ring beam and its use method. The open ring beam utilizes weathering steel as its base material, and its surface undergoes a zinc-plated treatment to enhance its corrosion resistance and serve as a permanent tunnel structure. Furthermore, the open ring beam is capable of a certain amount of vertical and horizontal displacement. During the shield segment excavation process, the servo jacks adjust the open ring beam's displacement in real time, in conjunction with tunnel excavation ring monitoring data. This ensures relative stability of segment force and displacement throughout the excavation process, significantly improving the safety of shield excavation operations. This method is highly applicable, economical, and has broad application prospects.

[0042] The above description is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be understood by anyone familiar with the technology within the technical scope disclosed by the present invention should be included in the scope of the present invention.

Claims

1. A corrosion-resistant and adjustable deformation shield tunnel opening ring beam, characterized in that: The open ring beam is made of four L-shaped square steel pieces joined end to end into a "mouth" shape and connected to the permanent steel segments by bolts. A displacement meter is installed on each of the permanent steel segments adjacent to the upper, lower, left, and right sides of the open ring beam. An insertion portion is formed at one end of the L-shaped square steel, and a slot is formed at the other end thereof for the insertion portion to be inserted into. Two adjacent L-shaped square steels are connected by plugging and unplugging through the insertion portion and the slot; A servo jack for adjusting the distance between the two adjacent L-shaped square steels is connected between the surfaces of the two adjacent L-shaped square steels. A support member is connected to each end of the servo jack, and the two support members are fixedly connected to the surfaces of the two adjacent L-shaped square steels.

2. The corrosion-resistant and adjustable-deformation shield tunnel opening ring beam according to claim 1 is characterized in that: The interior of the L-shaped square steel is hollow, and a rib plate for increasing the overall rigidity of the open ring beam is welded to the hollow cavity inside the L-shaped square steel, and a circular hole is provided on the rib plate.

3. The corrosion-resistant and adjustable-deformation shield tunnel opening ring beam according to claim 1 is characterized in that: The support member is composed of an L-shaped end plate and a triangular rib plate, and the triangular rib plate is connected to the corners of the L-shaped end plate.

4. The corrosion-resistant and adjustable-deformation shield tunnel opening ring beam according to claim 3 is characterized in that: The bottom plate of the L-shaped end plate is fixedly connected to the surface of the open ring beam by bolts.

5. The corrosion-resistant and adjustable-deformation shield tunnel opening ring beam according to claim 1, characterized in that: The open ring beam uses weathering steel as a base material, and its surface is subjected to zinc infiltration treatment.

6. A method for using the corrosion-resistant and adjustable-deformation shield tunnel open ring beam according to any one of claims 1 to 5, characterized in that: The steps include: Step S1: Connect the L-shaped square steel of the 1 / 4 open ring beam end to end to assemble into an "O"-shaped open ring beam; Step S2: During the shield segment opening process, after the temporary steel segments of the tunnel are removed, the prefabricated open ring beam is fixedly connected to the permanent steel segments at the opening by bolts; Step S3: Fix the support members of the servo jack to the open ring beam in the "up", "down", "left" and "right" directions with bolts, and fix the servo jack between two adjacent open ring beams; Step S4: fixing displacement meters on permanent steel segments adjacent to the open ring beam to measure the horizontal and vertical displacements of the permanent steel segments at the opening; Step S5: During the subsequent construction process of the shield tunneling, the horizontal and vertical displacements of the permanent steel pipe segments at the opening are monitored in real time by displacement meters. If the horizontal or vertical position value of the permanent steel pipe segment exceeds the control value, the horizontal or vertical servo jack is quickly activated to push the segment forward, so as to control the displacement value of the permanent steel pipe segment within a safe and controllable range. Step S6: After the shield tunneling construction is completed, the supports on the open ring beam, the servo jacks, and the displacement gauges on the permanent steel pipe segments are removed, and cement mortar is poured into the interior of the open ring beam through the bolt holes on the open ring beam to fill it tightly. The open ring beam will later serve as a permanent component of the shield tunnel and will be cast together with the connecting channel.

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