High-efficient shield split launching construction method

Abstract

The application discloses a high-efficiency shield split launching and tunneling construction method, which comprises the following steps: S1, first-time main machine tunneling; S2, second-time main machine, equipment bridge, 1# and 2# trolley tunneling; and S3, third-time whole machine launching and tunneling. The shield split launching and construction is divided into three tunneling processes by adopting the method of shield body assembling in a shaft launching shaft, stage tunneling, and moving the counterforce frame forward after removing the negative ring segment in advance. The three-time split launching can realize the high-efficiency shield split launching and construction even under the condition of the single shaft narrow space. After the first-time main machine split launching and tunneling for a certain distance, the negative ring segment is removed in advance, the counterforce frame is moved to the hole end, the single shaft can provide the space for the subsequent trolley to go down the shaft, the vertical transportation space of the tunneling construction is increased, the input of a plurality of extension pipelines is reduced, the tunneling construction efficiency is improved, the whole machine tunneling is realized through the three-time process conversion, and the construction cost and the construction difficulty are effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of shield tunneling technology, specifically relating to an efficient method for the separate launching of a shield tunnel. Background Technology

[0002] In current tunnel construction, the shield tunneling method has become the preferred method for tunnel construction in various construction fields due to its advantages such as construction safety, high efficiency, high degree of automation, and minimal impact on the surrounding environment. However, during shield tunneling, the long length of the shield machine and the insufficient length of the launching shaft often cause difficulties in the construction process.

[0003] Normally, the length of the launching shaft during a tunnel boring machine (TBM) launch operation is greater than the total length of the TBM. However, under certain special construction conditions, such as in confined spaces with a single vertical shaft, the total length of the launching shaft is often less than the total length of the TBM due to site limitations. In such cases, a split-body launching method must be adopted. This method utilizes the vertical transport space between the negative ring segments and the reaction frame and the launching shaft wall, using small muck buckets for excavation. Once the TBM has been excavated to its full length and the segment friction is sufficient to provide thrust, the reaction frame and negative ring segments are removed, and all the supporting trolleys are hoisted to the launching shaft for assembly. After debugging, the launching operation is completed, and tunneling begins. The split-body construction method requires long extension pipelines and has low construction efficiency. Summary of the Invention

[0004] To overcome the technical shortcomings of existing split-type construction methods, such as long extended pipelines and low construction efficiency, this invention provides a highly efficient split-type shield tunneling starting construction method. This method involves assembling the shield body in a single vertical shaft starting shaft, staged tunneling, early removal of negative ring segments, and forward movement of the reaction frame. By decomposing the split-type shield tunneling starting construction into three tunneling processes, the whole machine tunneling is achieved through these three process transitions, thus solving the aforementioned technical problems.

[0005] A highly efficient shield tunneling method for split-stage launching construction, comprising three launching stages, includes the following steps:

[0006] S1: The first main excavation involves hoisting the starting base, shield body, and reaction frame into the starting shaft in sequence and fixing and positioning them. The extension pipeline is used to connect and debug the shield body in the shaft. At the same time, the auger is moved forward for installation. Due to the limited space between the reaction frame and the shaft wall of the starting shaft, the battery-powered vehicle cannot be lowered into the shaft. Only a winch and a small slag bucket can be used to remove slag for the first separate starting excavation.

[0007] S2: The second stage of tunneling for the main machine, equipment bridge, and No. 1 and No. 2 trolleys. When the first stage of segmented excavation has reached a designated distance to provide conditions for subsequent segment assembly, after the shield machine segments are assembled and grouting is performed simultaneously, the reaction frame is removed and the negative ring segments are removed in advance. The reaction frame is moved forward and placed at the end of the segment at the entrance of the tunnel. The ground equipment bridge and No. 1 and No. 2 trolleys are hoisted down into the shaft and connected to the shield machine. No. 1 trolley is moved forward and No. 2 trolley is moved backward. At the same time, the conveyor belt muck removal device is moved forward to the rear of No. 2 trolley for installation and excavation. At this time, a temporary gantry is used to support and fix the conveyor belt muck removal device to drop the muck into the muck hopper for muck removal. As the shield tunneling progresses, the vertical transportation space of the starting shaft increases. After the space for hoisting the large muck hopper is met, the muck is removed using a battery-powered vehicle and a large muck hopper for the second stage of segmented excavation.

[0008] S3: The third stage of whole machine excavation begins after the second stage of split excavation has reached a specified distance and all the rear supporting trolleys have been lowered into the well. After removing all extension pipelines and temporary gantry frames, the third stage of whole machine excavation begins. The remaining rear supporting trolleys are lowered into the well for assembly. The belt conveyor is moved to the designed trolley position for installation and excavation. After the pipeline connection and debugging are completed, normal tunneling construction begins.

[0009] In the above-mentioned efficient shield tunneling split-type launching construction method, in step S2, when the shield body has advanced to a certain distance, the reaction frame and the negative ring segment are removed in advance. At this time, the vertical space of the launching shaft is just enough to meet the hoisting and lowering space of the trolleys containing the synchronous grouting system, the slag improvement system, the hydraulic system, and the double-rail beam unloading segment system. This reduces the need for extended pipeline layout and improves the efficiency of segment unloading. At the same time, the belt conveyor is moved forward to the rear of the No. 2 trolley for soil removal, which can increase the length of the tunneling group and improve construction efficiency under limited space conditions.

[0010] In the above-mentioned efficient shield tunneling split-starting construction method, step S2 involves removing the reaction frame and negative ring segments in advance, and moving the reaction frame forward to the end of the tunnel segment at the tunnel entrance, which can provide a counter-thrust for the shield tunneling to advance again.

[0011] In the aforementioned efficient shield tunneling split-type launching construction method, step S3, after the initial split-type launching of the main machine, provides space for the rear auxiliary trolley to be lowered into the shaft, while also increasing the space for vertical transportation during tunneling construction, thereby improving construction efficiency under limited space conditions.

[0012] Overall, compared with the prior art, the technical solution conceived in this invention can achieve the following beneficial effects: This invention provides an efficient shield tunneling split-type starting construction method, which adopts a method of assembling the shield body in a single vertical shaft starting shaft, staged tunneling, early removal of negative ring segments, and forward movement of the reaction frame. This method decomposes the shield tunneling split-type starting construction into three tunneling processes. Through the conversion of three processes, the whole machine tunneling is realized. This enables the shield tunneling construction to be carried out quickly even under the condition of such a narrow starting space in a single vertical shaft. It reduces the investment of many extension pipelines, improves tunneling construction efficiency, saves construction time, and effectively reduces construction costs and construction difficulty. Attached Figure Description

[0013] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0014] Figure 1 This is a flowchart of an efficient shield tunneling split-type initiation construction method according to the present invention;

[0015] Figure 2 This is a schematic diagram of the overall structure of the launching shaft and tunnel boring machine described in this invention;

[0016] Figure 3 This is a schematic diagram of the initial split-type launch arrangement of the present invention;

[0017] Figure 4 This is a schematic diagram of the first excavation stage of the present invention.

[0018] Figure 5 This is a schematic diagram of simultaneous grouting and segment assembly after the first stage of excavation has progressed a certain distance.

[0019] Figure 6 This is a schematic diagram illustrating the second tunneling operation initiated by the split-type initiation of the present invention;

[0020] Figure 7 This is a schematic diagram of the second excavation and muck removal process starting from the split-type start point;

[0021] Figure 8 This is a schematic diagram illustrating the separate excavation and construction process of this invention.

[0022] In the diagram: 1-launching shaft, 2-launching base, 3-shield body, 4-reaction frame, 5-trolley, 6-extension pipeline, 7-screw conveyor, 8-winner, 9-small slag hopper, 10-negative ring segment, 11-belt conveyor, 12-battery vehicle, 13-large slag hopper. Detailed Implementation

[0023] like Figure 1 The diagram shown is a flowchart of a high-efficiency shield tunneling split-type launching construction method according to the present invention, which is divided into three launching advances and includes three construction steps:

[0024] Step 1: The first main excavation mainly includes: sequentially hoisting the launching base 2, shield body 3, and reaction frame 4 into the launching shaft 1 and fixing and positioning them, such as... Figure 2 and Figure 3 The diagram shows the overall structure of the launching shaft and the tunnel boring machine (TBM), as well as the initial split-type launching arrangement. The extended pipeline 6 connects to and debugs the underground shield body 3. Simultaneously, the auger 7 is moved forward for installation. Due to limited space between the reaction frame 4 and the wall of the launching shaft 1, the battery-powered vehicle train cannot be lowered into the shaft; instead, a winch 8 and a small slag hopper 9 are used for slag removal. The first split-type launching excavation is then carried out. The construction process is as follows: Figure 4 and Figure 5 As shown;

[0025] Step 2: The second tunneling of the main machine, equipment bridge, No. 1 and No. 2 trolleys. After the first segment excavation has reached a specified distance, it provides conditions for the subsequent segment assembly. The tunnel segment is then assembled on the shield machine.

[0026] After synchronous grouting is completed, the reaction frame 4 and negative ring segment 10 are removed. Simultaneously, the reaction frame 4 is moved forward and positioned at the segment end of the tunnel entrance. The ground equipment bridge and trolleys 1 and 2 (5) are hoisted down the shaft and connected to the main shield 3. Trolley 1 (5) is moved forward, and trolley 2 (5) is moved backward. At the same time, the belt conveyor 11 is moved forward to the rear of trolley 2 (5) for excavation. At this point, a temporary gantry is used to lower the slag into the slag hopper for slag removal. As the tunnel boring machine (TBM) advances, the vertical transport space of the starting shaft 1 increases. Once the large slag hopper has sufficient space for hoisting, battery-powered vehicle 12 and large slag hopper 13 are used for slag removal, and the second split-type starting excavation is carried out. Figure 6 and Figure 7 The diagram shown illustrates the process of starting and exiting the second tunneling stage in this invention.

[0027] Step 3: Third overall excavation. After the second split excavation has reached a specified distance and the length of all the rear supporting trolleys 5 in the well is met, all extension pipelines 6 and temporary gantry are removed, and the third overall excavation begins. The remaining rear supporting trolleys 5 are lowered into the well for assembly. The belt conveyor 11 is moved to the designed trolley position for installation and excavation. After the pipeline connection and debugging are completed, normal tunneling construction is carried out.

[0028] During the initial excavation in step one, when the shield 3 has advanced to a certain distance, the reaction frame 4 and negative ring segment 10 are removed in advance. At this time, the vertical space of the starting shaft is just enough to accommodate the synchronous grouting system, the slag improvement system, the hydraulic system, and the double-rail beam unloading segment system. In the space of the hoisting and lowering of the trolley 5, the layout of the extension pipeline 6 is reduced, and the efficiency of segment unloading is improved. At the same time, the belt conveyor 11 is moved forward to the rear of the No. 2 trolley for installation and excavation, which can increase the length of the tunneling group and improve the construction efficiency under limited space conditions.

[0029] Before the second excavation in step two, the reaction frame 4 and negative ring segment 10 are removed in advance, and the reaction frame 4 is moved forward to the end of the segment at the tunnel entrance, which can provide counter-thrust for the shield tunneling to advance again. Figure 8 The diagram shown is a schematic diagram of the split-type initial excavation construction of the present invention.

[0030] This invention addresses the limitation of the launching shaft structure, which prevents the shield tunneling machine from launching as a whole. It employs a method of assembling the shield body, advancing the tunneling in stages, and removing the negative ring segments in advance within a single vertical shaft launching shaft. This breaks down the shield tunneling launch into three stages, achieving whole-machine tunneling through these three process transitions. This allows for rapid shield tunneling launch even in the confined space of a single vertical shaft, reducing the need for numerous extension pipelines, improving tunneling efficiency, saving time, and effectively lowering construction costs and difficulty.

Claims

1. A highly efficient method for the separate launching of a tunnel boring machine (TBM), comprising three launching stages, characterized in that... The construction method includes the following steps: S1: The first main excavation is carried out by hoisting the starting base (2), shield (3) and reaction frame (4) into the starting shaft (1) in sequence and fixing and positioning them. The extension pipeline (6) is connected to the shield (3) in the shaft for debugging. At the same time, the screw conveyor (7) is moved forward for installation. Due to the limited space between the reaction frame (4) and the shaft wall of the starting shaft (1), the battery car group cannot be lowered into the shaft. Only the winch (8) + small slag bucket (9) can be used to remove slag and carry out the first split starting excavation. S2: The second main machine, equipment bridge, No. 1 trolley and No. 2 trolley are excavated. When the first split excavation reaches a specified distance to provide conditions for subsequent segment assembly, after the shield machine segments are assembled and grouting is performed simultaneously, the reaction frame (4) is removed and the negative ring segment (10) is removed in advance. The reaction frame (4) is moved forward and placed at the end of the segment at the entrance of the tunnel. The ground equipment bridge, No. 1 trolley and No. 2 trolley (5) are hoisted down into the well and connected to the shield body (3) main machine. No. 1 trolley is moved forward and No. 2 trolley is moved backward. At the same time, the belt conveyor slag removal device is moved forward to the tail of No. 2 trolley to install the soil removal. At this time, a temporary gantry frame is used to support and fix the belt conveyor slag removal device to drop the slag into the slag bucket for slag removal. As the shield tunneling progresses, the vertical transportation space of the starting shaft (1) increases. After the large slag bucket hoisting space is satisfied, the battery car (12) + large slag bucket (13) is used for slag removal and the second split excavation is carried out. S3: The third stage of whole machine excavation begins after the second stage of split excavation has reached a specified distance and all the rear supporting trolleys (5) have reached the required length in the well. After removing all extension pipelines (6) and temporary gantry, the third stage of whole machine excavation begins. The remaining rear supporting trolleys (5) are then lowered into the well for assembly. The belt conveyor (11) is moved to the designed trolley position for installation and excavation. After the pipeline connection and debugging are completed, normal tunneling construction is carried out.

2. The efficient shield tunneling split-type launching construction method according to claim 1, characterized in that, In step S2, when the shield (3) has been excavated to a certain distance, the reaction frame (4) and the negative ring segment (10) are removed in advance. At this time, the vertical space of the starting shaft is just enough to meet the hoisting and lowering space of the trolley (5) where the synchronous grouting system, slag improvement system, hydraulic system and double track beam unloading segment system are located. This reduces the layout of the extension pipeline (6) and improves the efficiency of segment unloading. At the same time, the belt conveyor (11) is moved forward to the rear of the No. 2 trolley to install the excavation, which can increase the length of the tunneling group and improve the construction efficiency under limited space conditions.

3. The efficient shield tunneling split-type launching construction method according to claim 1, characterized in that, In step S2, by removing the reaction frame (4) and the negative ring segment (10) in advance, the reaction frame (4) is moved forward to the end of the tunnel segment, which can provide a counter-thrust for the shield to tunnel again.

4. The efficient shield tunneling split-type launching construction method according to claim 1, characterized in that, In step S3, after the initial excavation of the main unit, the single shaft can provide space for the rear supporting trolley (5) to go down into the shaft, and at the same time increase the space for vertical transportation during tunneling construction, thereby improving construction efficiency under limited space conditions.

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