Top shield dual-mode contact channel construction method synchronously constructed with main line tunnel

Abstract

According to the construction method of the top shield dual-mode connection channel synchronously constructed with the main line tunnel, multiple measures such as multi-track optimized arrangement, main line track advanced lifting and turnout arrangement, a main pipe piece inner supporting system, starting of a semi-closed dual-sealing structure, receiving of a full-closed under-pressure sleeve structure and a jacking and shield combination mode are integrated; a reasonable and reliable system is formed, and the aim of top shield construction of a main line tunnel and a contact channel through a synchronous mechanical method is achieved. According to the method, the top shield construction of the contact channel can be completed on the basis that the normal construction of the main line tunnel is hardly influenced. Through a top shield dual-mode machine, the influence of gradual increase of the jacking force of long-distance connection channel pipe jacking construction on a main line tunnel is solved, a shield construction method is switched in time, connection channel construction is completed, after a first section is completed, the tunnel is turned around in the tunnel, and then the tunnel is turned to a next connection channel construction point in the same interval for starting construction; and the direction is not required to be switched back to the main line shield starting well, so that the efficiency is greatly improved, and the manpower and material resource cost is saved.

Description

Technical Field

[0001] The present application belongs to the technical field of tunnel construction, and specifically relates to a top shield dual-mode communication channel construction method that is constructed synchronously with a main line tunnel. Background Art

[0002] The connecting channel is an important part of the subway section tunnel and the intercity railway section tunnel. At present, the construction of the connecting channel is mostly carried out by mining method, freezing and mining method, which has low safety, long construction period, high requirements on geological environment, poor adaptability in soft soil areas and water-rich strata, and poor overall safety and efficiency of long-distance channel construction.

[0003] As pipe jacking and shield tunneling are used more and more widely, the technology is becoming more and more mature, and the ability of equipment manufacturing has reached a new height. The construction of the communication channel has begun to explore new technologies and processes, and the mechanical communication channel construction has become an important force. However, whether it is the mining method, freezing and mining method, or mechanical communication channel construction, it needs to be constructed after the main line tunnel is connected; and in order to horizontally move and transport the mechanical communication channel equipment in the main line tunnel, many temporary facilities in the main line tunnel need to be dismantled before normal construction. Therefore, the original communication channel construction has a greater impact on the total construction period of the project, and there are more construction safety risks. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the embodiment of the present application provides a top shield dual-mode communication channel construction method that is constructed synchronously with the main line tunnel. It solves the technical problem of synchronous construction of the communication channel and the main line tunnel, and at the same time solves the drawbacks of excessive top force, low efficiency and high cost of simple mechanical pipe jacking construction and shield construction.

[0005] According to a first aspect of an embodiment of the present application, a top shield dual-mode communication channel construction method that is synchronously constructed with a main line tunnel is provided, and for synchronously excavating a communication channel between two adjacent main line tunnels, the method specifically includes the following steps: Step 1: Lay double tracks: With the connecting channel as the middle point, lift the sleeper surface to both sides, adjust the track to double lanes, install turnouts at both ends, and use one lane as the main line locomotive lane, and the other as the connecting channel construction trolley parking track and the connecting channel transport locomotive running and parking track; Step 2: Equipment transportation and fixation: The main pipe section internal support system of the main line tunnel assembled on the ground and in a retracted state is transported to the communication channel by a transport trolley. After it is in place, the support cylinder is pushed out to keep it in working condition. The starting tunnel door ring and the semi-enclosed double-sealed sleeve structure assembled on the ground are transported to the communication channel by a transport trolley. The front end is welded and installed with the ring shield segment of the main line tunnel by the cooperation of the crane mechanism. The front shield of the top shield machine assembled on the ground is transported to the communication channel by a transport trolley, and then sent into the semi-enclosed double-sealed sleeve structure at the starting end through the temporary oil cylinder at the rear, close to the inner wall of the main line tunnel; Step 3: Sealing at the starting end: semi-enclosed double sealing structure at the starting end, fill the sealing grease in the semi-sleeve sealing steel brush, and inflate the pressure plate airbag; install the screw machine driving components and the excavation port; install the jacking and reverse pulling mechanism cylinder and the reverse pulling and jacking steel ring; put the hydraulic and electrical system trolley in place, connect and debug; Step 4: Pipe jacking starts: After the excavation starts once and reaches the predetermined position, the top shield machine tail shield with two shield segments assembled is transported to the communication channel through the transport trolley and assembled with the top shield machine front shield. The shield cylinder pushes the shield segment out of the top shield machine tail shield. After the secondary excavation reaches the predetermined position, the jacking pipe segments are assembled in the support system of the main line tunnel. After being connected with the shield segments at the shield tail, the jacking construction cycle is carried out; the slag is transported to the wellhead and hoisted out by the slag truck and independent locomotive group; Step 5: Switching to shield tunneling: When the connecting channel is long, switch to shield tunneling mode and transport the shield tunnel segments to the assembly position through the horizontal transport vehicle in the tunnel. After the assembly is completed, the excavation construction cycle is carried out; Step 6: Sealing the receiving end: The receiving end is fully enclosed with pressure sleeve structure. Through the excavation construction cycle, it reaches the receiving end. Sand and thick mud are filled in the fully enclosed with pressure sleeve of the receiving end to reach the designed amount. The cutterhead cuts and breaks the shield segments of the main tunnel ring, and the shield body enters the receiving sleeve completely. Grouting is performed simultaneously to seal the shield segments and the excavation gap to achieve the designed effect. Step 7: Remove the steel sleeve, separate the shield body and shield segments, and transport them to the construction site of the next section of the connecting channel in this section by a transport trolley. This tunnel is converted from the receiving side to the starting side; Step 8. Repeat steps 1 to 7 to construct the next section of the connecting channel in this section.

[0006] Furthermore, in the third step, the semi-closed double-sealed sleeve structure at the starting end includes: a tunnel gate steel ring, a half-sleeve sealing steel brush, a pipe joint, a pressure plate, a tunnel gate curtain and a pressure plate airbag, the half-sleeve sealing steel brush is arranged between the tunnel gate steel ring and the pipe joint, the interior of the half-sleeve sealing steel brush is filled with sealing grease, a tunnel gate curtain is arranged on one side of the tunnel gate steel ring, the tunnel gate curtain is laid on the pressure plate, a pressure plate airbag is arranged on the tunnel gate curtain, and the pressure plate airbag is inflated to apply pressure to the tunnel gate curtain and the pressure plate.

[0007] Furthermore, the half-sleeve sealing steel brushes are arranged in multiple groups according to the number of pipe segments.

[0008] Furthermore, a grouting bag belt is pre-buried outside the pipe segment.

[0009] Furthermore, in the fourth and fifth steps, the jacking mode is first used for construction, and when the length of the connecting channel is long, the shield mode is switched for construction.

[0010] Compared with the prior art, the beneficial effect of the present application is that the present application provides a top shield dual-mode communication channel construction method that is constructed synchronously with the main line tunnel, and adopts a double-track cross-arrangement. In the first to eighth steps, only a slight cross-conflict occurs in the equipment starting, receiving hoisting, and transfer stages and the main line tunnel construction. The remaining cycle construction stages and the half-sleeve installation and full-sleeve installation stages have no impact on the main line tunnel construction. At the same time, the top pipe is first constructed and then the shield is constructed, and the starting and receiving ends are sealed. The left and right interlaced construction not only protects the safety of the main line tunnel, but also improves efficiency and reduces costs, bringing good social and economic benefits to the construction party. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 The internal support system of the originating end and the receiving end provided in the embodiment of the present application; Figure 2 It is a structural schematic diagram of the half sleeve at the originating end and the full sleeve at the receiving end; Figure 3 This is a schematic diagram of the structure of the top shield machine assembly; Figure 4 It is a structural schematic diagram of the jacking and reverse pulling mechanism; Figure 5 It is a structural diagram of top shield mode switching; Figure 6 This is a schematic diagram of the structure of shield tunneling; Figure 7 It is a schematic diagram of the structure of full sleeve reception; Figure 8 Schematic diagrams of the diameters of pipe segments and pipe sections, wherein (a) is a schematic diagram of the diameters of pipe segments, and (b) is a schematic diagram of the diameters of pipe sections; Fig. 9 It is the structural diagram of the top shield machine; Fig.10 It is a structural schematic diagram of the semi-enclosed double sealing structure at the starting end; Fig.11 for Fig.10 The enlarged view of point A in the middle; Fig.12 It is a structural diagram of a fully enclosed pressure sleeve structure at the receiving end; Fig.13 for Fig.12The enlarged view of point B in the middle; Serial numbers in the figure: 1-mainline tunnel ring section at the originating end; 2-mainline tunnel ring section at the receiving end; 3-sleeper track layout; 4-main section internal support system; 4.1-internal support frame; 4.2-inner support integrated support shoe; 5-semi-enclosed double sealing sleeve structure at the originating end; 5.1-tunnel steel ring; 5.2-semi-sleeve sealing steel brush; 5.3-pipe section; 5.4-pressing plate; 5.5-tunnel curtain cloth; 5.6-pressing plate airbag; 5.7- grouting bag belt; 6- fully enclosed pressure sleeve structure at the receiving end; 6.1- fully enclosed steel sleeve; 7- main line tunnel train formation; 8- top shield machine; 8.1- front shield of top shield machine; 8.2- rear shield of top shield machine; 9- front frame for starting and receiving; 10- rear frame for starting and receiving; 11- oil cylinder of jacking and reverse pulling mechanism; 12- reverse pulling and jacking steel ring; 13- shield segment; 14- jacking pipe section; 15- crane mechanism. DETAILED DESCRIPTION

[0012] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0013] In the embodiment of the present application, a top shield dual-mode communication channel construction method is provided, which is synchronously constructed with the main line tunnel. For synchronously excavating the communication channel between two adjacent main line tunnels, the method specifically includes the following steps: Step 1: Lay double tracks: With the connecting channel as the middle point, lift the sleeper surface to both sides, adjust the track to double lanes, install turnouts at both ends, and use one lane as the main line locomotive lane, and the other as the connecting channel construction trolley parking track and the connecting channel transport locomotive running and parking track; Step 2: Equipment transportation and fixation: like Figure 1 As shown, the main pipe section internal support system 4 of the main line tunnel assembled on the ground and in a retracted state is transported to the communication channel by a transport trolley, and after being in place, the support cylinder is pushed out to maintain the working state; The starting tunnel door ring and the starting end semi-enclosed double sealing sleeve structure 5 assembled on the ground are transported to the communication channel by a transport trolley, and the front end is welded and installed with the main line tunnel ring shield segment 13 by the cooperation of the crane mechanism 15; The front shield 8.1 of the top shield machine assembled on the ground is transported to the communication channel by a transport trolley, and is sent into the semi-enclosed double-sealed sleeve structure 5 at the starting end through the rear temporary oil cylinder, close to the inner wall of the main line tunnel; Step 3: Sealing at the start: Figure 2As shown, the semi-enclosed double sealing sleeve structure 5 at the starting end, the sealing grease is filled in the half sleeve sealing steel brush 5.2, and the pressure plate airbag 5.6 is inflated; the screw machine driving components and the earth-outlet are installed; the jacking and reverse pulling mechanism cylinder 11 and the reverse pulling and jacking steel ring 12 are installed; the hydraulic and electrical system trolley is in place, connected and debugged; Step 4: Pipe jacking starts: After the initial excavation reaches the predetermined position, the top shield machine tail shield 8.2 with two shield segments 13 assembled is transported to the communication channel through a transport trolley and assembled with the top shield machine front shield 8.1. The shield cylinder pushes the shield segment 13 out of the top shield machine tail shield 8.2; After the secondary excavation reaches the predetermined position, the jacking pipe segment 14 is assembled in the support system of the main line tunnel, and after being connected with the shield segment 13 at the shield tail, the jacking construction cycle is carried out; the slag is transported to the wellhead and hoisted out by the slag truck and the independent locomotive group; Step 5: Figure 5 As shown, the top pipe shield is switched: when the length of the connecting channel is long, the shield mode is switched to construction, and the shield segment 13 is transported to the assembly position by the horizontal transport vehicle in the tunnel. After the assembly is completed, the excavation construction cycle is carried out; Step 6: Figure 8 As shown, the receiving end is sealed: the receiving end fully enclosed pressure sleeve structure 6, through the excavation construction cycle, reaches the receiving end, the receiving end fully enclosed pressure sleeve is filled with sand and thick mud to reach the designed amount, the cutter head cuts and breaks the main tunnel ring shield segment 13, and the shield body enters the receiving sleeve completely; Fig. 9 As shown, synchronous grouting is performed to seal the shield segment 13 and the excavation gap to achieve the designed effect; Step 7: Remove the steel sleeve, separate the shield body and the shield segment 13, and transport them to the construction site of the next section of the connecting channel in this section by a transport trolley. The tunnel is converted from the receiving side to the starting side. Step 8. Repeat steps 1 to 7 to construct the next section of the connecting channel in this section.

[0014] In this embodiment, in the third step, if Fig.10 and Fig.11 As shown, the starting end semi-closed double sealing sleeve structure 5 comprises: a tunnel gate steel ring 5.1, a half-sleeve sealing steel brush 5.2, a pipe section 5.3, a pressure plate 5.4, a tunnel gate curtain 5.5 and a pressure plate airbag 5.6. The half-sleeve sealing steel brush 5.2 is arranged between the tunnel gate steel ring 5.1 and the pipe section 5.3. The interior of the half-sleeve sealing steel brush 5.2 is filled with sealing grease. A tunnel gate curtain 5.5 is arranged on one side of the tunnel gate steel ring 5.1. The tunnel gate curtain 5.5 is laid on the pressure plate 5.4. A pressure plate airbag 5.6 is arranged on the tunnel gate curtain 5.5. The pressure plate airbag 5.6 is inflated to apply pressure to the tunnel gate curtain 5.5 and the pressure plate 5.4.

[0015] In this embodiment, multiple groups of half-sleeve sealing steel brushes 5.2 are provided according to the number of pipe segments 5.3.

[0016] In this embodiment, a grouting bag belt 5.7 is pre-buried outside the pipe section 5.3.

[0017] In this embodiment, Figure 1 As shown, the main line tunnel involved in the top shield dual-mode communication channel construction method constructed simultaneously with the main line tunnel in this application includes a main line tunnel ring section 1 at the starting end; a main line tunnel ring section 2 at the receiving end; a sleeper track arrangement 3 and a main pipe segment internal support system 4, the main pipe segment internal support system 4 includes an internal support frame 4.1; an internal support integrated support shoe 4.2, which supports the shield pipe segments and jacking pipe sections in the main line tunnel; the main line tunnel train formation 7 is located on the sleeper track arrangement 3, and a traveling crane mechanism 15 is also provided in the main line tunnel.

[0018] In this embodiment, in the fourth and fifth steps, the top-pushing mode is first used for construction, and when the length of the connecting channel is long, the shield mode is switched for construction. If multiple connecting channels need to be excavated between the two main tunnels, after completing the excavation of one connecting channel, multiple connecting channels can be excavated quickly and cyclically.

[0019] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like 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, and do not indicate or imply that the referred device or element 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.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0021] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0022] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0023] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A top shield dual-mode communication channel construction method constructed synchronously with the main line tunnel, characterized in that: The synchronous excavation of a communication channel between two adjacent main line tunnels specifically includes the following steps: Step 1: Lay double tracks: With the connecting channel as the middle point, lift the sleeper surface to both sides, adjust the track to double lanes, install turnouts at both ends, and use one lane as the main line locomotive lane, and the other as the connecting channel construction trolley parking track and the connecting channel transport locomotive running and parking track; Step 2: Equipment transportation and fixation: The main pipe section internal support system of the main line tunnel assembled on the ground and in a retracted state is transported to the communication channel by a transport trolley. After it is in place, the support cylinder is pushed out to keep it in working condition. The starting tunnel door ring and the semi-enclosed double-sealed sleeve structure assembled on the ground are transported to the communication channel by a transport trolley. The front end is welded and installed with the ring shield segment of the main line tunnel by the cooperation of the crane mechanism. The front shield of the top shield machine assembled on the ground is transported to the communication channel by a transport trolley, and then sent into the semi-enclosed double-sealed sleeve structure at the starting end through the temporary oil cylinder at the rear, close to the inner wall of the main line tunnel; Step 3: Sealing at the starting end: semi-enclosed double sealing structure at the starting end, fill the sealing grease in the semi-sleeve sealing steel brush, and inflate the pressure plate airbag; install the screw machine driving components and the excavation port; install the jacking and reverse pulling mechanism cylinder and the reverse pulling and jacking steel ring; put the hydraulic and electrical system trolley in place, connect and debug; Step 4: Pipe jacking starts: After the excavation starts once and reaches the predetermined position, the top shield machine tail shield with two shield segments assembled is transported to the communication channel through the transport trolley and assembled with the top shield machine front shield. The shield cylinder pushes the shield segment out of the top shield machine tail shield. After the secondary excavation reaches the predetermined position, the jacking pipe segments are assembled in the support system of the main line tunnel. After being connected with the shield segments at the shield tail, the jacking construction cycle is carried out; the slag is transported to the wellhead and hoisted out by the slag truck and independent locomotive group; Step 5: Switching to shield tunneling: When the connecting channel is long, switch to shield tunneling mode and transport the shield tunnel segments to the assembly position through the horizontal transport vehicle in the tunnel. After the assembly is completed, the excavation construction cycle is carried out; Step 6: Sealing the receiving end: The receiving end is fully enclosed with pressure sleeve structure. Through the excavation construction cycle, it reaches the receiving end. Sand and thick mud are filled in the fully enclosed with pressure sleeve of the receiving end to reach the designed amount. The cutterhead cuts and breaks the shield segments of the main tunnel ring, and the shield body enters the receiving sleeve completely. Grouting is performed simultaneously to seal the shield segments and the excavation gap to achieve the designed effect. Step 7: Remove the steel sleeve, separate the shield body and shield segments, and transport them to the construction site of the next section of the connecting channel in this section by a transport trolley. This tunnel is converted from the receiving side to the starting side; Step 8. Repeat steps 1 to 7 to construct the next section of the connecting channel in this section.

2. The method for constructing a top shield dual-mode communication channel synchronously constructed with a main line tunnel according to claim 1, characterized in that: In the third step, the semi-closed double-sealed sleeve structure at the starting end includes: a tunnel gate steel ring, a half-sleeve sealing steel brush, a pipe joint, a pressure plate, a tunnel gate curtain and a pressure plate airbag. The half-sleeve sealing steel brush is arranged between the tunnel gate steel ring and the pipe joint. The interior of the half-sleeve sealing steel brush is filled with sealing grease. A tunnel gate curtain is arranged on one side of the tunnel gate steel ring. The tunnel gate curtain is laid on the pressure plate. A pressure plate airbag is arranged on the tunnel gate curtain. The pressure plate airbag is inflated to apply pressure to the tunnel gate curtain and the pressure plate.

3. The method for constructing a top shield dual-mode communication channel synchronously constructed with a main line tunnel according to claim 2 is characterized in that: The half-sleeve sealing steel brushes are arranged in multiple groups according to the number of pipe sections.

4. The method for constructing a top shield dual-mode communication channel synchronously constructed with a main line tunnel according to claim 2, characterized in that: A grouting bag belt is pre-buried outside the pipe segment.

5. The method for constructing a top shield dual-mode communication channel synchronously constructed with a main line tunnel according to claim 1, characterized in that: In the fourth and fifth steps, the jacking mode is used for construction first. When the length of the connecting channel is long, the shield mode is switched for construction.

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