Working-well-free shield receiving structure with trapezoidal reinforcement matched with ballasting and construction method of working-well-free shield receiving structure

Abstract

In order to solve the problem that existing urban tunnel construction is low in efficiency, the working well-free shield receiving structure with the trapezoid reinforcement and the weight matched comprises a soil body reinforcement structure which is used for reinforcing a shallow soil body at the receiving end of a shield tunneling machine and preventing a tunnel and a duct piece from floating upwards when the shield tunneling machine receives the shield tunneling machine. The soil body reinforcing structure is arranged in a shallower soil covering interval of a receiving end used for receiving of the shield tunneling machine. The ground stacking structure is used for reinforcing the extremely shallow soil body at the receiving end of the shield tunneling machine and preventing the tunnel and the duct piece from floating upwards when the shield tunneling machine is used for receiving, and the ground stacking structure is arranged in the extremely shallow soil covering interval of the receiving end used for receiving of the shield tunneling machine and located at the tail of the soil body reinforcing structure. According to the method, a soil body reinforcing structure and a ground stacking structure are effectively combined, the problems of ground structure demolition, ground traffic turning and diverting, pipeline moving and the like are reduced, the construction period can be greatly shortened, construction fund and human input are reduced, and obvious economic benefits are achieved.

Description

Technical Field

[0001] This invention belongs to the field of urban tunnel construction technology, and specifically relates to a trapezoidal reinforcement and counterweight combination shield receiving structure without working shaft and its construction method. Background Technology

[0002] Currently, when constructing urban tunnels, construction workers mostly use two methods: open-cut and shield tunneling. For urban road tunnels built in soft soil and shallow burial, the tunnels are mostly constructed using the open-cut method. Although this method meets the construction environment of soft soil and shallow burial, it leads to disadvantages such as traffic diversion, pipeline relocation, and demolition of structures on the ground surface, and has a significant impact on the surrounding environment.

[0003] Deep-buried urban tunnels are mostly constructed using the shield tunneling method. Due to the need to receive the shield machine, a relatively deep working shaft needs to be excavated. Large-scale excavation not only brings a series of problems such as relocation of the construction site and interruption of ground traffic, but also causes a lot of inconvenience to the lives of surrounding residents due to the noise and vibration generated by the construction machinery. The shield machine receiving work is one of the most critical and problem-prone procedures in shield tunneling construction. Moreover, the excavation of the working shaft requires huge financial and time investment. Therefore, the shield tunneling method with working shafts can no longer meet the needs of urban tunnel construction. Summary of the Invention

[0004] In order to improve construction efficiency and reduce construction costs, this invention provides a working shaft shield receiving structure and its construction method that combines trapezoidal reinforcement and counterweight.

[0005] The technical solution of the present invention for a working shaft shield receiving structure with trapezoidal reinforcement and counterweight combination is as follows:

[0006] A trapezoidal reinforcement and counterweight combination structure for a workless shield tunneling receiving shaft, characterized in that it includes:

[0007] A soil reinforcement structure for reinforcing the shallow soil at the receiving end of a pair of tunnel boring machines (TBMs) and preventing the tunnel and segments from floating, wherein the soil reinforcement structure is set within the shallow overburden area at the receiving end of the TBMs.

[0008] A ground surcharge structure is used to reinforce the extremely shallow soil at the receiving end of a pair of tunnel boring machines (TBMs) and prevent the tunnel and segments from floating. The ground surcharge structure is set within the extremely shallow overburden area at the receiving end of the TBMs and is located at the tail of the soil reinforcement structure.

[0009] Furthermore, the soil reinforcement structure is reinforced using a triaxial mixing full-span reinforcement method.

[0010] Furthermore, the reinforcement depth of the soil reinforcement structure can be distributed in a trapezoidal shape according to the shield machine's profile and overburden thickness.

[0011] Furthermore, the ground surcharge structure adopts a ground trapezoidal surcharge form.

[0012] This invention also provides a construction method for a working shaft shield receiving structure with trapezoidal reinforcement and counterweight combination, characterized by the following steps:

[0013] First step: According to the tunnel design alignment, the construction workers carried out trapezoidal triaxial mixing reinforcement in the shallower overburden section according to the different overburden depths above the tunnel.

[0014] The second step: Set up trapezoidal ground surcharges of different widths and heights in the extremely shallow overburden area;

[0015] The third step: the tunnel boring machine advances, passes through the shallow overburden zone and enters the extremely shallow overburden zone, and the hydraulic cylinders of the tunnel boring machine unload the pressure.

[0016] Fourth step: The support force at the tunnel boring machine face decreases, and the ground slack sinks;

[0017] Step 5: Clear the ground loads and sunken soil;

[0018] Step 6: The tunnel boring machine advances to the exit position, and the tunnel boring machine reception is completed.

[0019] This invention discloses a trapezoidal reinforcement and ballast combination shield receiving structure and its construction method for a working shaft-free shield receiving structure. The working shaft-free shield receiving structure has a reasonable overall design, simple structure, and convenient operation. It effectively combines soil reinforcement structure and ground surcharge structure. By using trapezoidal soil reinforcement and ground ballast combination in various sections with shallow and very shallow overburden, it avoids problems such as shield floating caused by shallow overburden. It can reduce the construction of foundation pit excavation, demolition of ground structures, rerouting of ground traffic, and relocation of pipelines. It can significantly shorten the construction period, reduce construction funds and manpower input, and has obvious economic benefits. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a trapezoidal reinforcement and counterweight combination non-working shaft shield receiving structure and its construction method according to the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of a shield tunneling machine after it has passed through a shallow overburden zone and entered an extremely shallow overburden zone, according to the present invention, which is a trapezoidal reinforcement and counterweight combination shield receiving structure and its construction method.

[0022] Figure 3This is a schematic diagram of the construction method of a trapezoidal reinforcement and counterweight combination non-working shaft shield receiving structure and its construction method, which involves clearing the ground load and the soil entrapment. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0024] Example 1

[0025] refer to Figures 1 to 3 The present embodiment of a trapezoidal reinforcement and counterweight combination shield receiving structure without working shaft includes a soil reinforcement structure 100 and a ground surcharge structure 200.

[0026] The soil reinforcement structure 100 is used to reinforce the shallow soil at the receiving end of the tunnel boring machine (TBM) and prevent the tunnel and segments from floating. The soil reinforcement structure 100 is set in the shallow soil cover zone 400 at the receiving end of the TBM 300.

[0027] The ground surcharge structure 200 is used to reinforce the extremely shallow soil at the receiving end of the tunnel boring machine 300 and prevent the tunnel and segments from floating when the tunnel boring machine 300 is received. The ground surcharge structure 200 is set in the extremely shallow soil cover section 500 at the receiving end of the tunnel boring machine 300 and is located at the tail of the soil reinforcement structure 100.

[0028] The soil reinforcement structure 100 is reinforced using a triaxial mixing full-span reinforcement method. This reinforcement method effectively improves the overall stability of the soil reinforcement structure and further enhances its reinforcement performance.

[0029] The reinforcement depth of the soil reinforcement structure 100 can be distributed in a trapezoidal shape according to the tunnel boring machine line and the thickness of the overburden. The thicker the overburden, the greater the reinforcement depth, which further improves the practical performance of the soil reinforcement structure.

[0030] The ground surcharge structure 200 adopts a trapezoidal ground surcharge form, and different surcharge widths and surcharge heights can be set according to different soil cover depths. The ground surcharge structure 200 can effectively reinforce the soil at the receiving end of the tunnel boring machine. In this embodiment, the tunnel boring machine adopts a modified spoke cutterhead with a large opening ratio, which enables the tunnel boring machine to smoothly cut the excavation face and discharge slag in the shallow soil cover stage.

[0031] This invention also provides a construction method for a working shaft shield receiving structure with trapezoidal reinforcement and counterweight combination, comprising the following steps:

[0032] First step: According to the tunnel design alignment, the construction workers carried out trapezoidal triaxial mixing reinforcement in the shallower overburden section according to the different overburden depths above the tunnel.

[0033] The second step: Set up trapezoidal ground surcharges of different widths and heights in the extremely shallow overburden area;

[0034] The third step: the tunnel boring machine advances, passes through the shallow overburden zone and enters the extremely shallow overburden zone, and the hydraulic cylinders of the tunnel boring machine unload the pressure.

[0035] Fourth step: The support force at the tunnel boring machine face decreases, and the ground slack sinks;

[0036] Step 5: Clear the ground loads and sunken soil;

[0037] Step 6: The tunnel boring machine advances to the exit position, and the tunnel boring machine reception is completed.

[0038] This embodiment presents a trapezoidal reinforcement and ballast combination shield receiving structure and its construction method for a working shaft-free shield receiving structure. The working shaft-free shield receiving structure has a reasonable overall design, simple structure, and convenient operation. It effectively combines soil reinforcement structure and ground surcharge structure. By using trapezoidal soil reinforcement and ground ballast combination in various sections with shallow and very shallow overburden, it avoids problems such as shield floating caused by shallow overburden. It can reduce the construction of foundation pit excavation, the demolition of ground structures, the relocation of ground traffic, and the relocation of pipelines. It can significantly shorten the construction period, reduce construction funds and manpower input, and has obvious economic benefits.

[0039] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A trapezoidal reinforcement and counterweight combination structure for a workless shield tunneling receiving shaft, characterized in that, include A soil reinforcement structure (100) for reinforcing the shallow soil at the receiving end of a pair of tunnel boring machines (300) and preventing the tunnel and segments from floating when the tunnel boring machines (300) are receiving the tunnel. The soil reinforcement structure (100) is set in the shallow overburden zone (400) at the receiving end of the tunnel boring machine (300). A ground surcharge structure (200) for reinforcing the extremely shallow soil at the receiving end of a pair of tunnel boring machines (300) and preventing the tunnel and segments from floating when the tunnel boring machines (300) are receiving the tunnel. The ground surcharge structure (200) is located in the extremely shallow overburden area (500) at the receiving end of the tunnel boring machine and at the tail of the soil reinforcement structure (100).

2. The trapezoidal reinforcement and counterweight combination shield receiving structure for a workless shaft as described in claim 1, characterized in that, The soil reinforcement structure (100) is reinforced by a triaxial mixing full-span reinforcement method.

3. The trapezoidal reinforcement and counterweight combination shield receiving structure for a workless shaft as described in claim 1, characterized in that, The reinforcement depth of the soil reinforcement structure (100) can be distributed in a trapezoidal shape according to the thickness of the overburden of the tunnel boring machine.

4. The trapezoidal reinforcement and counterweight combination shield receiving structure for a workless shaft as described in claim 1, characterized in that, The ground surcharge structure (200) adopts a ground trapezoidal surcharge form.

5. A construction method for a trapezoidal reinforcement and counterweight combination shield tunneling receiving structure without working shaft, the construction method being based on the trapezoidal reinforcement and counterweight combination shield tunneling receiving structure without working shaft as described in any one of claims 1-4, characterized in that, Includes the following steps: First step: According to the tunnel design alignment, the construction workers carried out trapezoidal triaxial mixing reinforcement in the shallower overburden section according to the different overburden depths above the tunnel. The second step: Set up trapezoidal ground surcharges of different widths and heights in the extremely shallow overburden area; The third step: the tunnel boring machine advances, passes through the shallow overburden zone and enters the extremely shallow overburden zone, and the tunnel boring machine's hydraulic cylinders unload. Fourth step: The support force at the tunnel boring machine face decreases, and the ground slack sinks; Step 5: Clear the ground loads and sunken soil; Step 6: The tunnel boring machine advances to the exit position, and the tunnel boring machine reception is completed.

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