Fully-prefabricated three-layer shield tunnel structure and construction method thereof

Abstract

The invention discloses a fully-prefabricated three-layer shield tunnel structure and a construction method thereof, and relates to the technical field of building construction.The tunnel structure comprises shield prefabricated segments, a prefabricated butterfly-shaped lower-layer lane plate and a prefabricated upper-layer lane plate. The construction method comprises the steps that firstly, a shield tunneling machine is adopted for tunneling, and shield prefabricated pipe pieces are assembled to form a shield tunnel; secondly, the prefabricated butterfly-shaped lower-layer lane plate is transported and unfolded in the hole, and a lower-layer lane structure is formed; and then, the prefabricated upper-layer lane plate is inserted downwards, complete limiting is achieved, and a stable three-layer tunnel structure is formed. The flexible connection method of the prefabricated parts is adopted, full prefabrication of the three-layer structure in the shield tunnel is achieved, the prefabrication rate reaches 100%, use of post-pouring joints in traditional construction is avoided, the technical problems that dust, hydration heat, waste gas and the like exist in the environment in the tunnel in an existing scheme are solved, and the cleanliness and safety of the construction environment are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of building structures, and particularly relates to a fully prefabricated three-layer shield tunnel structure and a construction method thereof. Background Art

[0002] At present, the internal multi-layer lane structure of shield tunnels in China still mainly adopts semi-prefabricated construction, that is, a method combining precast components and cast-in-situ concrete. The lower layer lane uses "mouth / π"-shaped precast components to form a construction access road during the construction period to meet the transportation of relevant materials such as segment linings and achieve synchronous construction technology. The remaining structures are mainly cast-in-situ construction. To promote the industrialization of the construction industry, the industry has continuously tried prefabrication solutions and continuously increased the prefabrication rate. However, the solution still takes the form of "prefabricated components + post-cast joints". Although the prefabrication rate has been continuously increased, the existence of post-cast joints still makes the洞内 environment still suffer from dust, hydration heat, waste gas, etc. Summary of the Invention

[0003] In view of the above technical problems, the present invention provides a fully prefabricated three-layer shield tunnel structure and a construction method thereof. There is no need for post-cast joints between precast components, and they are completely flexibly connected. The prefabrication rate and assembly rate are 100%, solving the technical problems that the existing solutions cause dust, hydration heat, and waste gas in the洞内 environment.

[0004] The present invention provides a fully prefabricated three-layer shield tunnel structure, adopting the following technical solutions:

[0005] A fully prefabricated three-layer shield tunnel structure includes shield precast segments, precast butterfly-shaped lower lane slabs, and precast upper lane slabs; the shield precast segments are assembled to form a shield tunnel; the precast butterfly-shaped lower lane slab can be unfolded or retracted. After the precast butterfly-shaped lower lane slab is unfolded, it is arranged in the middle and lower part of the shield tunnel and forms a lower space of the tunnel structure with the bottom of the shield tunnel, and the lower space is an equipment layer; the precast upper lane slab is arranged above the precast butterfly-shaped lower lane slab and forms a middle space of the tunnel structure with the precast butterfly-shaped lower lane slab, and the middle space is a lower lane layer; an upper space is formed between the precast upper lane slab and the shield tunnel, and the upper space is an upper lane layer.

[0006] Preferably, the precast butterfly-shaped lower lane slab includes a steel column-shaped rotating bearing, a steel rotating shaft fixing arm, a reinforced concrete rotating arm, a winch-type steel cable opening and closing device, and a limit steel cable; the two reinforced concrete rotating arms are symmetrically arranged, one end of each of the two reinforced concrete rotating arms is connected to the steel rotating shaft fixing arm, the ends of the two steel rotating shaft fixing arms are connected through the steel column-shaped rotating bearing, and the winch-type steel cable opening and closing device is connected to one end of the two reinforced concrete rotating arms far from the steel rotating shaft fixing arm through the limit steel cable;

[0007] The opening of the winch-type steel cable opening and closing device can drive the two reinforced concrete rotating arms to unfold or retract.

[0008] Preferably, the reinforced concrete rotating arm includes a bottom support arm and a side support arm, the bottom support arm and the side support arm are integrally formed, the outer side surface of the side support arm is in contact with the inner side surface of the shield prefabricated segment, and the inner side surface of the bottom support arm is parallel to the tangent of the bottom of the shield prefabricated segment after it is unfolded.

[0009] Preferably, one end of the side support arm away from the bottom support arm is provided with a step groove, and the prefabricated upper lane slab is inserted between the step grooves of the two side support arms.

[0010] The present invention also provides a method for constructing a fully prefabricated three-layer shield tunnel structure, the steps of which are as follows:

[0011] S1. Use a shield machine to carry out excavation construction and assemble prefabricated shield segments to form a shield tunnel;

[0012] S2, assemble the prefabricated butterfly-shaped lower lane slab, which is transported by a flatbed truck in the shield tunnel to the assembly work area behind the shield machine;

[0013] S3, hoisting the prefabricated butterfly-shaped lower lane plate onto the hydraulic assembly work platform, and laying the prefabricated butterfly-shaped lower lane plate flat and unfolding it, so that the prefabricated butterfly-shaped lower lane plate and the bottom of the shield tunnel form the lower space of the tunnel structure;

[0014] S4. Hoist the prefabricated upper lane slab above the prefabricated butterfly-shaped lower lane slab, and insert the fully unfolded prefabricated butterfly-shaped lower lane slab downward to limit the deformation of the prefabricated butterfly-shaped lower lane slab and form a stable structure; at the same time, form a middle space between the prefabricated upper lane slab and the prefabricated butterfly-shaped lower lane slab, and form an upper space between the prefabricated upper lane slab and the shield tunnel;

[0015] S5. Divide the shield tunnel into 2m to 4m blocks along its direction, repeat the process in sequence, and assemble them forward to achieve simultaneous construction with shield excavation and assembly of shield prefabricated segments.

[0016] Preferably, in step S3, the steel cylindrical swivel bearing is placed on a hydraulic assembly work platform, and the hydraulic assembly work platform is provided with a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is in contact with the reinforced concrete rotating arm.

[0017] Preferably, in step S3, the winch-type steel cable opening and closing device is opened, the limiting steel cable is released, and at the same time, the hydraulic cylinder telescopic rod of the hydraulic assembly work platform is contracted to slowly level the prefabricated butterfly-shaped lower lane plate.

[0018] Beneficial effects of the present invention:

[0019] (1) Improving the prefabrication rate and assembly rate: The tunnel structure of the present invention is completely composed of prefabricated components, including prefabricated shield segments, prefabricated butterfly-shaped lower lane slabs and prefabricated upper lane slabs, which are fully flexibly connected, achieving a prefabrication rate and assembly rate of 100%, avoiding the use of post-cast joints in traditional construction, and solving technical problems such as dust, hydration heat, and exhaust gas in the tunnel environment in existing solutions, improving the cleanliness and safety of the construction environment, and providing workers with healthier working conditions.

[0020] (2) Improved construction efficiency: The present invention uses fully prefabricated components with simple connections between components, eliminating the need for on-site pouring and waiting for concrete to harden, thereby greatly improving construction efficiency. At the same time, the construction method achieves simultaneous construction with shield tunneling and assembly of prefabricated shield segments, further shortening the construction period.

[0021] (3) Stable structure and strong anti-deformation ability: The prefabricated butterfly-shaped lower lane plate of the present invention is unfolded and positioned by a winch-type steel cable opening and closing device and a hydraulic assembly work platform, forming a stable lower space with the bottom of the shield tunnel. After the prefabricated upper lane plate is inserted into the prefabricated butterfly-shaped lower lane plate, its deformation is limited, forming a more stable three-layer tunnel structure, which makes this structure have good anti-deformation ability and bearing capacity.

[0022] (4) Easy maintenance and expansion: The tunnel structure of the present invention is composed entirely of prefabricated components, so it can be easily maintained and expanded. If a component needs to be replaced or repaired, it only needs to be removed and replaced with a new one, without the need for large-scale reconstruction of the entire tunnel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] For ease of explanation, the present invention is described in detail with reference to the following specific implementations and the accompanying drawings.

[0024] Figure 1 This is a schematic diagram of the structure of the prefabricated butterfly-shaped lower lane slab in this embodiment;

[0025] Figure 2 This is a schematic diagram of the structure of the shield prefabricated segments assembled in this embodiment;

[0026] Figure 3 This is a schematic diagram of the transportation of the prefabricated butterfly-shaped lower lane slab in the shield tunnel of this embodiment;

[0027] Figure 4 This is a schematic diagram of the prefabricated butterfly-shaped lower lane plate of this embodiment being placed on a hydraulic assembly work platform;

[0028] Figure 5 It is a schematic diagram of the unfolding process of the prefabricated butterfly-shaped lower lane slab in this embodiment;

[0029] Figure 6This is a schematic diagram of the unfolded prefabricated butterfly-shaped lower lane slab of this embodiment;

[0030] Figure 7 It is a schematic diagram of the insertion process of the prefabricated upper lane slab in this embodiment;

[0031] Figure 8 This is a schematic diagram of the overall structure of this embodiment after assembly;

[0032] Fig. 9 Schematic diagram of the assembly process of this embodiment.

[0033] In the figure:

[0034] 1- shield prefabricated segments; 2- prefabricated butterfly-shaped lower lane slab; 21- steel cylindrical swivel bearing; 22- steel shaft fixed arm; 23- reinforced concrete rotating arm; 231- bottom support arm; 232- side support arm; 24- winch type steel cable opening and closing device; 25- limit steel cable; 3- prefabricated upper lane slab; 4- hydraulic assembly work platform; 5- lower space; 6- middle space; 7- upper space; 8- shield machine;

[0035] A is the assembled area (horizontal transportation of prefabricated components); B is the prefabricated upper lane slab assembly area; C is the prefabricated butterfly-shaped lower lane slab assembly area; D is the prefabricated butterfly-shaped lower lane slab deployment area; E is the shield machine excavation and segment assembly area; F is the horizontal transportation process of the prefabricated butterfly-shaped lower lane slab; G is the turning over and erecting process of the prefabricated butterfly-shaped lower lane slab; H is the deployment process of the prefabricated butterfly-shaped lower lane slab. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments; in the following description, specific details such as specific configurations and components are provided only to help fully understand the embodiments of the present invention. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, for the sake of clarity and brevity, the description of known functions and structures is omitted.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0038] like Figure 1-Figure 9As shown, a fully prefabricated three-layer shield tunnel structure provided by this embodiment includes a shield prefabricated pipe segment 1, a prefabricated butterfly-shaped lower lane slab 2 and a prefabricated upper lane slab 3; the shield prefabricated pipe segment 1 is assembled to form a shield tunnel; the prefabricated butterfly-shaped lower lane slab 2 can be unfolded or folded, and the prefabricated butterfly-shaped lower lane slab 2 is arranged in the middle and lower part of the shield tunnel after being unfolded, and forms a lower space 5 of the tunnel structure with the bottom of the shield tunnel, and the lower space 5 is the equipment layer; the prefabricated upper lane slab 3 is arranged above the prefabricated butterfly-shaped lower lane slab 2, and forms a middle space 6 of the tunnel structure between the prefabricated butterfly-shaped lower lane slab 2, and the middle space 6 is the lower lane layer; the upper space 7 is formed between the prefabricated upper lane slab 3 and the shield tunnel, and the upper space 7 is the upper lane layer.

[0039] Furthermore, the prefabricated butterfly-shaped lower lane slab 2 includes a steel cylindrical rotating bearing 21, a steel rotating shaft fixed arm 22, a reinforced concrete rotating arm 23, a winch-type steel cable opening and closing device 24 and a limiting steel cable 25; the two reinforced concrete rotating arms 23 are symmetrically arranged, one end of the two reinforced concrete rotating arms 23 is connected to the steel rotating shaft fixed arm 22, the ends of the two steel rotating shaft fixed arms 22 are connected through the steel cylindrical rotating bearing 21, and the winch-type steel cable opening and closing device 24 is connected to the two reinforced concrete rotating arms 23 through the limiting steel cable 25 away from the steel rotating shaft fixed arm 22 is connected; the reinforced concrete rotating arm 23 includes a bottom support arm 231 and a side support arm 232, the bottom support arm 231 and the side support arm 232 are integrally formed, the outer side surface of the side support arm 232 is in contact with the inner side surface of the shield prefabricated pipe segment 1, and the inner side surface of the bottom support arm 231 is parallel to the tangent of the bottom of the shield prefabricated pipe segment 1 after the bottom support arm 231 is unfolded; a step groove is provided at one end of the side support arm 232 away from the bottom support arm 231, and the prefabricated upper lane slab 3 is inserted between the step grooves of the two side support arms 232.

[0040] The prefabricated butterfly-shaped lower lane slab 2 of this embodiment opens the winch-type steel cable opening and closing device 24, releases the limiting steel cable 25, and the reinforced concrete rotating arm 23 is unfolded. The bottom support arm 231 forms a lower lane structure, and the side support arm 232 abuts against the shield prefabricated pipe segment 1. The bottom support arm 231 and the bottom of the shield tunnel form a stable lower space 5 (equipment layer) for laying cables and erecting equipment. After the prefabricated upper lane slab 3 is inserted into the upper end of the side support arm 232 of the unfolded prefabricated butterfly-shaped lower lane slab 2, the deformation of the prefabricated butterfly-shaped lower lane slab 2 is limited. The prefabricated upper lane slab 3 and the prefabricated butterfly-shaped lower lane slab 2 form a middle space 6 (lower lane layer), and form an upper space 7 (upper lane layer) between the shield tunnel, thereby forming a more stable three-layer tunnel structure that meets different traffic needs and has good anti-deformation ability and bearing capacity.

[0041] This embodiment also provides a method for constructing a fully prefabricated three-layer shield tunnel structure, the steps of which are as follows:

[0042] S1, using a shield machine 8 to carry out excavation construction, and assembling shield prefabricated segments 1 to form a shield tunnel;

[0043] S2, assembling the prefabricated butterfly-shaped lower lane slab 2, which is transported by a flatbed truck in the shield tunnel to the assembly operation area behind the shield machine 8;

[0044] S3, hoist the prefabricated butterfly-shaped lower lane plate 2 onto the hydraulic assembly work platform 4, the steel column shaft 21 is placed on the hydraulic assembly work platform 4, the hydraulic assembly work platform 4 is provided with a hydraulic cylinder, the telescopic rod of the hydraulic cylinder is in contact with the reinforced concrete rotating arm 23; open the winch-type steel cable opening and closing device 24, release the limit steel cable 25, and at the same time, the telescopic rod of the hydraulic cylinder of the hydraulic assembly work platform 4 is retracted, and the prefabricated butterfly-shaped lower lane plate 2 is slowly leveled, and the prefabricated butterfly-shaped lower lane plate 2 and the bottom of the shield tunnel form the lower space 5 of the tunnel structure;

[0045] S4, hoist the prefabricated upper lane slab 3 above the prefabricated butterfly-shaped lower lane slab 2, and insert the fully unfolded prefabricated butterfly-shaped lower lane slab 2 downward to limit the deformation of the prefabricated butterfly-shaped lower lane slab 2 to form a stable structure; at the same time, a middle space 6 is formed between the prefabricated upper lane slab 3 and the prefabricated butterfly-shaped lower lane slab 2, and an upper space 7 is formed between the prefabricated upper lane slab 3 and the shield tunnel;

[0046] S5. Divide the shield tunnel into 2m to 4m blocks along its direction, repeat the process in sequence, and assemble them forward to achieve simultaneous construction with shield excavation and assembly of shield prefabricated segments.

[0047] The tunnel structure of this embodiment is completely composed of prefabricated components, including shield prefabricated segments 1, prefabricated butterfly-shaped lower lane slabs 2 and prefabricated upper lane slabs 3, which are fully flexibly connected, achieving a prefabrication rate and assembly rate of 100%, avoiding the use of post-cast joints in traditional construction, and solving technical problems such as dust, hydration heat, and exhaust gas in the tunnel environment in existing solutions, improving the cleanliness and safety of the construction environment, and providing workers with healthier working conditions; there is no need to cast on site and wait for concrete to harden, which can greatly improve construction efficiency; at the same time, this construction method realizes synchronous construction with shield excavation and assembly of shield prefabricated segments, further shortening the construction period.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] In the description of the present application, it should be understood that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

Claims

1. A fully prefabricated three-layer shield tunnel structure, characterized in that: It comprises a shield prefabricated segment (1), a prefabricated butterfly-shaped lower lane slab (2) and a prefabricated upper lane slab (3); The shield prefabricated segments (1) are assembled to form a shield tunnel; The prefabricated butterfly-shaped lower lane slab (2) can be unfolded or folded. After being unfolded, the prefabricated butterfly-shaped lower lane slab (2) is arranged in the middle and lower part of the shield tunnel and forms a lower space (5) of the tunnel structure with the bottom of the shield tunnel. The lower space (5) is an equipment layer. The prefabricated upper lane slab (3) is arranged above the prefabricated butterfly-shaped lower lane slab (2), and forms a middle space (6) of a tunnel structure between the prefabricated butterfly-shaped lower lane slab (2), wherein the middle space (6) is the lower lane layer; An upper space (7) is formed between the prefabricated upper lane slab (3) and the shield tunnel, and the upper space (7) is an upper lane layer.

2. A fully prefabricated three-layer shield tunnel structure according to claim 1, characterized in that: The prefabricated butterfly-shaped lower lane slab (2) comprises a steel columnar rotating bearing (21), a steel rotating shaft fixing arm (22), a reinforced concrete rotating arm (23), a winch-type steel cable opening and closing device (24) and a limiting steel cable (25); the two reinforced concrete rotating arms (23) are symmetrically arranged, one end of the two reinforced concrete rotating arms (23) is connected to the steel rotating shaft fixing arm (22), the ends of the two steel rotating shaft fixing arms (22) are connected via the steel columnar rotating bearing (21), and the winch-type steel cable opening and closing device (24) is connected to one end of the two reinforced concrete rotating arms (23) away from the steel rotating shaft fixing arm (22) via the limiting steel cable (25); The opening of the winch-type steel cable opening and closing device (24) can drive the two reinforced concrete rotating arms (23) to unfold or retract.

3. A fully prefabricated three-layer shield tunnel structure according to claim 2, characterized in that: The reinforced concrete rotating arm (23) comprises a bottom support arm (231) and a side support arm (232); the bottom support arm (231) and the side support arm (232) are integrally formed; the outer side surface of the side support arm (232) is in contact with the inner side surface of the shield prefabricated segment (1); and when the bottom support arm (231) is unfolded, its inner side surface is parallel to a tangent line of the bottom of the shield prefabricated segment (1).

4. A fully prefabricated three-layer shield tunnel structure according to claim 3, characterized in that: One end of the side support arm (232) away from the bottom support arm (231) is provided with a step groove, and the prefabricated upper lane slab (3) is inserted between the step grooves of the two side support arms (232).

5. A method for constructing a fully prefabricated three-layer shield tunnel structure as claimed in any one of claims 2 to 4, characterized in that: Here are the steps: S1. Using a shield machine to carry out excavation construction and assembling shield prefabricated segments (1) to form a shield tunnel; S2, assembling the prefabricated butterfly-shaped lower lane slab (2), transporting it by a flatbed truck in the shield tunnel to the assembly operation area behind the shield machine (8); S3, hoisting the prefabricated butterfly-shaped lower lane plate (2) onto the hydraulic assembly work platform (4), and laying the prefabricated butterfly-shaped lower lane plate (2) flat and unfolding it, so that the prefabricated butterfly-shaped lower lane plate (2) and the bottom of the shield tunnel form a lower space (5) of the tunnel structure; S4, hoisting the prefabricated upper lane slab (3) above the prefabricated butterfly-shaped lower lane slab (2), inserting the fully unfolded prefabricated butterfly-shaped lower lane slab (2) downward, limiting the deformation of the prefabricated butterfly-shaped lower lane slab (2), and forming a stable structure; at the same time, forming a middle space (6) between the prefabricated upper lane slab (3) and the prefabricated butterfly-shaped lower lane slab (2), and forming an upper space (7) between the prefabricated upper lane slab (3) and the shield tunnel; S5. Divide the shield tunnel into 2m~4m blocks along its direction, repeat the process in sequence, and assemble them forward to achieve simultaneous construction with shield excavation and assembly of shield prefabricated segments.

6. The method for constructing a fully prefabricated three-layer shield tunnel structure according to claim 5, characterized in that: In step S3, the steel columnar rotating bearing (21) is placed on a hydraulic assembly work platform (4), wherein the hydraulic assembly work platform (4) is provided with a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is in contact with the reinforced concrete rotating arm (23).

7. The method for constructing a fully prefabricated three-layer shield tunnel structure according to claim 6, characterized in that: In step S3, the winch-type steel cable opening and closing device (24) is opened, the limit steel cable (25) is released, and at the same time, the hydraulic cylinder telescopic rod of the hydraulic assembly work platform (4) is retracted to slowly level the prefabricated butterfly-shaped lower lane plate (2).

Images