Shield tunneling machine in-situ turning-around and secondary small-static-distance launching construction method

Abstract

The invention discloses a shield tunneling machine in-situ U-turn and secondary small static distance launching construction method, which belongs to the technical field of tunnel construction, and comprises the following steps: S10, carrying out ground treatment on an air shaft receiving end, and placing a carrier for receiving a shield tunneling machine host; s20, the air shaft receiving end receives the shield main machine of the right line and then is disconnected with the rear matched trolley; s30, the shield main machine is turned around in situ in the air shaft, and the disconnected matched trolleys are sequentially connected with the shield main machine; s40, deep hole grouting is conducted through grouting holes reserved in the right line hole outlet ring duct piece, and a rock-soil body between the left line tunnel and the right line tunnel is reinforced; and S50, slab staggering between the segment rings and deformation conditions of the formed tunnel are monitored. The shield main machine turns around in situ, so that the construction risk, the cost and the construction period are greatly shortened, and the influence of left-line shield starting tunneling on a right-line formed tunnel is reduced by reinforcing the rock-soil body between the two tunnels.

Description

Technical Field

[0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an in-situ turning method of a shield machine and a secondary small static distance starting construction method. Background Art

[0002] With the development of my country's economy, major cities are building urban rail transit projects. When building urban rail projects in cities, stations are mostly constructed by open excavation, and sections are mostly constructed by shield tunneling. If the net distance between the left line starting end and the right line excavation contour is small, it belongs to a small net distance starting. The left line shield excavation will inevitably affect the right line formed tunnel. Therefore, a shield machine in-situ turning method and secondary small static distance starting construction method are urgently needed. Summary of the invention

[0003] In order to achieve the above object, the present invention adopts the following technical solutions:

[0004] A shield machine in-situ turning method and secondary small static distance starting construction method, the method comprising the following steps:

[0005] S10. Excavate a type A section at the air outlet tunnel entrance, and excavate a type B section at the starting and ending mileage of the section. Set a transition section between the type A section and the type B section, perform ground treatment on the transition section, and place a carrier to receive the shield machine host;

[0006] S20, after receiving the shield machine of the right line at the receiving end of the wind shaft, disconnect it from the supporting trolley;

[0007] S30, turning the shield machine in situ in the ventilation shaft, and connecting the disconnected rear supporting trolleys to the shield machine in sequence;

[0008] S40, deep hole grouting is performed using the grouting holes reserved on the right line exit ring segment to reinforce the rock and soil between the left and right line tunnels;

[0009] S50. Monitor the misalignment between segment rings and deformation of formed tunnels.

[0010] Furthermore, in step S10, firstly, mortar is laid on the ground for leveling, and after hardening, a translation steel plate is laid, and then a receiving bracket is placed on the steel plate as a carrier for receiving the shield machine mainframe.

[0011] Furthermore, the thickness of the laid steel plate is 20 mm, and butter is spread on the steel plate.

[0012] Furthermore, in step S20, the rear supporting trolley is translated to the hoisting well mouth and is lifted one by one by the crane to a safe distance from the ground and then turned around on the spot.

[0013] Furthermore, in step S40, deep hole grouting is performed using the grouting holes reserved on the 10-ring segment of the right line exit tunnel to reinforce the rock and soil between the two tunnels.

[0014] Furthermore, in step S50, monitoring points are arranged on the 10-ring segment of the right line exit hole to monitor the deformation of the formed tunnel.

[0015] Beneficial effects:

[0016] The shield machine (with the screw machine) of the present invention can be turned around on the spot, thus eliminating the process of disassembling, hoisting, transporting, lowering into the well and assembling, and in particular, there is no need to pull out the screw machine, thus greatly shortening the construction risk, cost and construction period.

[0017] The rear supporting trolley of the shield machine of the present invention is translated to the hoisting well mouth, and after being hoisted to a safe height from the ground, it is turned around on the spot, thus eliminating the process of hoisting to the ground, transporting, and lowering into the well, and reducing construction risks, costs, and construction period.

[0018] The present invention fully and reasonably utilizes the large-diameter shield tunnel that has been penetrated in the middle ventilation shaft and the adjacent section to lay the turnout, so that the slag on the left line of the section can be smoothly transported to the railway station for external transportation.

[0019] The present invention reduces the influence of the initial excavation of the left-line shield machine on the right-line formed tunnel by reinforcing the rock and soil between the two tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a plane schematic diagram of the dark excavation section of the present invention;

[0021] Figure 2 It is a schematic diagram of the longitudinal section of the dark excavation section of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the A-section tunnel of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of a B-section tunnel of the present invention;

[0024] Figure 5 This is a schematic plan view of the in-situ U-turn of the main engine of the present invention;

[0025] Figure 6 This is a schematic diagram of the main engine turning around in situ Figure 1 ;

[0026] Figure 7 This is a schematic diagram of the main engine turning around in situ Figure 2 ;

[0027] Figure 8 The illustration of the translation and turning of the supporting trolley of the present invention Figure 1 ;

[0028] Fig. 9 The illustration of the translation and turning of the supporting trolley of the present invention Figure 2 ;

[0029] Fig.10 The illustration of the translation and turning of the supporting trolley of the present invention Figure 3 ;

[0030] Fig.11 The illustration of the translation and turning of the supporting trolley of the present invention Figure 4 ;

[0031] Fig.12 This is a schematic diagram of the shield machine rear supporting trolley in the large shield machine of the present invention;

[0032] Fig.13 It is a schematic diagram of a translational cross-sectional view in the intermediate air shaft of the present invention;

[0033] Fig.14 This is a schematic diagram of deep hole grouting reinforcement according to the present invention. Figure 1 ;

[0034] Fig.15 This is a schematic diagram of deep hole grouting reinforcement according to the present invention. Figure 2 . DETAILED DESCRIPTION

[0035] Example 1

[0036] refer to Figure 1-Figure 15 A shield machine in-situ turning method and secondary small static distance starting construction method, the method comprises the following steps:

[0037] S10. Excavate a type A section at the air outlet tunnel entrance, and excavate a type B section at the starting and ending mileage of the section. Set a transition section between the type A section and the type B section, perform ground treatment on the transition section, and place a carrier to receive the shield machine host;

[0038] In this embodiment, in step S10, firstly, mortar is laid on the ground for leveling, and after hardening, a translation steel plate is laid, and then a receiving bracket is placed on the steel plate as a carrier for receiving the shield machine mainframe.

[0039] In this embodiment, the thickness of the laid steel plate is 20 mm, and butter is spread on the steel plate.

[0040] During specific implementation, at the receiving tunnel gate, a shield machine receiving bracket is arranged on the steel plate along the right line excavation direction of the shield machine, and the shield machine is received by the shield machine receiving bracket.

[0041] S20, after receiving the shield machine of the right line at the receiving end of the wind shaft, disconnect it from the supporting trolley;

[0042] During the specific implementation, the pipeline connections between the shield machine and the supporting workshop will be removed;

[0043] In this embodiment, in step S20, the rear supporting trolleys are translated to the hoisting well mouth and are lifted one by one by the crane to a safe distance from the ground before turning around on the spot.

[0044] S30, turning the shield machine in situ in the ventilation shaft, and connecting the disconnected rear supporting trolleys to the shield machine in sequence;

[0045] During the specific implementation, jacking hydraulic cylinders are set on both sides of the shield machine receiving frame. By utilizing the coordinated jacking of the jacking hydraulic cylinders, the shield machine can be turned around on the steel plate layer and face the excavation direction of the left line.

[0046] During the specific implementation, after the right line is received, the shield main machine is disconnected from the rear supporting trolley, and the shield main machine (with screw machine) is directly turned on the spot through the hydraulic oil jack.

[0047] During the specific implementation, the rear supporting trolleys are moved horizontally to the hoisting wellhead and lifted one by one by the crane to a safe distance from the ground, then turned around on the spot. Subsequently, the pipelines are connected and the front and rear connections are installed between the shield machine and the adjacent trolley workshop to complete the turning construction.

[0048] The present invention fully and reasonably utilizes the large-diameter shield tunnel that has been penetrated in the middle ventilation shaft and the adjacent section to lay the turnout, so that the slag on the left line of the section can be smoothly transported to the railway station for external transportation.

[0049] S40, deep hole grouting is performed using the grouting holes reserved on the right line exit ring segment to reinforce the rock and soil between the left and right line tunnels;

[0050] In this embodiment, in step S40, deep hole grouting is performed using the grouting holes reserved on the 10-ring segment of the right line exit tunnel to reinforce the rock and soil between the two tunnels.

[0051] S50. Monitor the misalignment between segment rings and deformation of formed tunnels.

[0052] In this embodiment, in step S50, monitoring points are arranged on the 10-ring segment of the right line exit to monitor the deformation of the formed tunnel.

[0053] During the specific implementation, the pipe segments at the right line exit will be supported and reinforced with steel sections according to the actual situation.

[0054] During the specific implementation, before carrying out the implementation plan, we first conduct theoretical calculations on the translation, turning and small clearance starting of the shield machine through simulation, so as to provide a theoretical basis for the safe and rapid translation, turning and small clearance starting of the shield machine.

[0055] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A shield machine in-situ turning method and secondary small static distance starting construction method, characterized in that: The method comprises the following steps: S10. Excavate a type A section at the air outlet tunnel entrance, and excavate a type B section at the starting and ending mileage of the section. Set a transition section between the type A section and the type B section, perform ground treatment on the transition section, and place a carrier to receive the shield machine host; S20, after receiving the shield machine of the right line at the receiving end of the wind shaft, disconnect it from the supporting trolley; S30, turning the shield machine in situ in the ventilation shaft, and connecting the disconnected rear supporting trolleys to the shield machine in sequence; S40, deep hole grouting is performed using the grouting holes reserved on the right line exit ring segment to reinforce the rock and soil between the left and right line tunnels; S50. Monitor the misalignment between segment rings and deformation of formed tunnels.

2. The shield machine in-situ turning and secondary small static distance starting construction method according to claim 1 is characterized in that: In step S10, firstly, mortar is laid on the ground to level it, and after hardening, a translation steel plate is laid, and then a receiving bracket is placed on the steel plate as a carrier for receiving the shield machine mainframe.

3. The shield machine in-situ turning and secondary small static distance starting construction method according to claim 2 is characterized in that: The thickness of the laid steel plate is 20mm and butter is applied on the steel plate.

4. The shield machine in-situ turning and secondary small static distance starting construction method according to claim 1 is characterized in that: In step S20, the rear supporting trolley is translated to the hoisting well mouth and is lifted one by one by the crane to a safe distance from the ground and then turned around on the spot.

5. The shield machine in-situ turning and secondary small static distance starting construction method according to claim 1 is characterized in that: In step S40, deep hole grouting is performed using the grouting holes reserved on the 10-ring segment of the right line exit tunnel to reinforce the rock and soil between the two tunnels.

6. The shield machine in-situ turning and secondary small static distance starting construction method according to claim 1 is characterized in that: In step S50, monitoring points are arranged on the 10-ring segment of the right line exit to monitor the deformation of the formed tunnel.

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