Shield starting reaction device and construction method

Abstract

The present invention discloses a reaction force device and construction method for shield starting, which mainly includes a movable reaction force frame slidingly provided on the starting guide platform, a steel ring provided at the front end of the movable reaction force frame, and a plurality of horizontal support rods distributed at its four corners provided at the rear end of the movable reaction force frame, wherein the support rods support the movable reaction force frame through the lining of the starting shaft, and the support rods are installed on a support frame for enhancing its stability; the support rods are formed by a single unit steel rod or a plurality of unit steel rods connected together, and the support rods support the movable reaction force frame through a cone head provided at the front end thereof, and are powered by a stepping hydraulic cylinder provided between the support rods and the movable reaction force frame, so that the movable reaction force frame moves along the starting guide platform; the shield starting construction can be completed by the reaction force device. The present invention replaces the negative ring segment with the support rods, which requires less space and is conducive to completing the shield starting work in a smaller space.

Description

Technical Field

[0001] The present invention relates to the technical field of shield construction, and in particular to a reaction force device for starting a shield and a construction method. Background Art

[0002] In recent years, shield tunneling construction has been increasingly used in underground spaces, especially in urban subway projects, water conservancy projects, and urban integrated pipe corridor projects. The first task to be carried out when constructing a tunnel using the shield method is shield starting construction. If the shield starting construction is not carried out in a station, it is usually necessary to first construct a shield starting shaft, and then hoist the shield machine into the starting shaft for shield starting construction. The shield machine cannot be adjusted while advancing on the track of the starting bracket in the starting shaft, and the shield starting construction is often carried out in the soil layer of the shaft that has been reinforced with grouting or jet jet piles. The resistance to excavation is very large. Therefore, shield starting construction has always been a difficult and risky point in shield tunnel construction. It is an extremely important link in shield construction and is often related to the success or failure of the entire shield tunnel construction.

[0003] However, because shield tunneling start pits are often located in bustling urban areas with dense buildings and heavy traffic, available space is very limited, resulting in a restricted area for the shield tunneling start pit. During the shield tunneling start, full utilization of the limited space is crucial to ensure a smooth start of the shield machine. Traditional methods use negative ring starters, but negative ring segments occupy a significant amount of working space, further congesting the already limited start site. This creates cross-talk between various operations, severely impacting the start speed and safety of the shield machine. This often makes it difficult to start a tunnel shield machine due to insufficient space in the start pit. Summary of the Invention

[0004] The purpose of the present invention is to provide a reaction force device and a construction method for shield starting, so as to solve the technical problem that the existing shield machine is difficult to start the shield in a narrow space.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A shield starting reaction force device and construction method are designed, which mainly includes a starting guide platform fixedly set at the bottom of the starting working pit, a mobile reaction force frame slidably set on the starting guide platform, a steel ring is set at the front end of the mobile reaction force frame, and a plurality of horizontal support rods distributed at the four corners of the mobile reaction force frame are set at the rear end of the mobile reaction force frame. The support rods support the mobile reaction force frame through the lining of the starting pit, and the support rods are installed on a support frame for enhancing its stability;

[0007] The support rod is a single unit steel rod or a plurality of unit steel rods connected together, and the support rod supports the movable reaction frame through a cone head arranged at its front end, and is powered by a stepping hydraulic cylinder arranged between the support rod and the movable reaction frame to enable the movable reaction frame to move along the starting guide platform.

[0008] Preferably, the movable reaction frame includes a frame formed by an upper crossbeam, a lower crossbeam and columns connecting the upper crossbeam and the lower crossbeam; an inner ring is provided inside the frame, and the inner ring is a circular steel ring, and inclined supports are provided inside the four corners of the frame to enhance its stability; the steel ring is connected to the frame through multiple connecting rods and is suspended inside the shield tail of the shield machine to form a cantilever structure.

[0009] Preferably, a plurality of screws are provided in the vertical direction of the steel ring, and the ends of the screws are pushed into the shield tail of the shield machine through rollers, and the position of the steel ring in the shield tail is adjusted by the screws.

[0010] Preferably, the number of the screws is 6, and they are respectively arranged at 28.5°, 104°, 142°, 218°, 256°, and 331.5° of the circumference of the steel ring to ensure that the center point of the steel ring corresponds to the center point of the shield tail of the shield machine.

[0011] Preferably, the support frame includes a vertical rod and a horizontal rod connecting the vertical rod, a base is provided at the bottom of the vertical rod, and a support portion for supporting the support rod is provided on the vertical rod; the number of the support rods is four groups, two in each group, which are respectively arranged at the four corners of the rear end of the mobile reaction frame, and the two support rods in each group are connected by a vertical column, and one end of the stepping hydraulic cylinder supports the mobile reaction frame, and the other end supports the vertical column.

[0012] Preferably, a propulsion cylinder seat is provided on the steel ring at a position corresponding to the propulsion cylinder of the shield machine main body to ensure that the pushing surfaces of all propulsion cylinders are in the same plane; the vertical column is provided with a stepping hydraulic cylinder seat at the pushing position of the stepping hydraulic cylinder, and the stepping hydraulic cylinder seat includes four small cylinders supporting wedge-shaped steel plates, and the orientation of the support rod end is adjusted by the extension and retraction of the small cylinder, and plays a role in fixing the support rod end.

[0013] Preferably, the length of the unit steel rod corresponds to the width of the tunnel segment, so as to facilitate supporting the movable reaction frame by increasing the number of the unit steel rods to cooperate with the starting work of the shield machine.

[0014] Preferably, at least two suspension frames are provided on the top of the mobile reaction frame, and electric hoists are installed on the suspension frames for installing the cone head and the unit steel rod; the suspension frame includes a triangular structure formed by vertical, horizontal and inclined I-beams, and one corner of the triangular structure is welded to the mobile reaction frame.

[0015] A shield starting construction method based on the above-mentioned shield starting reaction device is designed, comprising the following steps:

[0016] (1) According to the design requirements, the mileage control points of the mobile reaction frame are set on the track of the starting guide platform, and the measurement points are set at the four corners of the mobile reaction frame in advance to facilitate the installation of the mobile reaction frame;

[0017] (2) Install and position the mobile reaction frame according to the positioning line; and detect the verticality and left and right offset of the mobile reaction frame as a whole through the measurement points in step (1) to ensure that it is installed in place;

[0018] (3) The shield starts and moves forward a certain distance. The mobile reaction frame moves forward the same distance, removes the cone head, and installs the unit steel rod. The removed cone head is then installed on the new unit steel rod. The mobile reaction frame is pushed back to connect and assemble with the cone head. This cycle is repeated to complete the start of the shield.

[0019] Preferably, in step (2), when installing the mobile reaction frame, butter should be applied to the starting guide platform track to ensure the movement of the mobile reaction frame; in step (3), the mobile reaction frame is pushed back by the shield machine main engine propulsion cylinder, so that the mobile reaction frame is docked and assembled with the cone head, and the cylinder gap is adjusted with a wedge block.

[0020] Compared with the prior art, the main beneficial technical effects of the present invention are:

[0021] 1. The present invention provides a reaction force for the shield machine to excavate by arranging support rods to support the inner wall of the starting working shaft, making the support structure more stable and replacing the negative ring segments with support rods to save space.

[0022] 2. The present invention provides a screw in the vertical direction of the shield tail steel ring for adjusting the relative position of the steel ring in the shield tail to avoid the phenomenon of failure of shield starting caused by tilt between the shield machine propulsion cylinder and the steel ring, thereby adapting to the shield starting work on the curve.

[0023] 3. The present invention is provided with a stepping hydraulic cylinder seat at the supporting position of the stepping hydraulic cylinder. The stepping hydraulic cylinder seat includes 4 small oil cylinder supporting wedge-shaped steel plates. The direction of the support rod is adjusted by the telescopic movement of the small oil cylinder, and plays the role of clamping the end of the support rod, thereby ensuring the accuracy and adjustability of the direction of the support rod, making the starting work more reliable.

[0024] 4. The present invention is provided with a support frame for placing support rods, thereby ensuring the stability of the support rods and ensuring the completion of the shield starting work.

[0025] 5. The present invention provides a suspension frame above the movable reaction frame for installing and disassembling the cone head and the unit steel rod, which is simple and convenient, is conducive to on-site construction, and improves the construction speed.

[0026] 6. The support rods of the present invention are steel rods and can be reused, thus saving a lot of costs caused by using negative ring segments and saving resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a reaction force device according to an embodiment of the present invention.

[0028] Figure 2 The figure is a schematic structural diagram of a movable reaction frame according to an embodiment of the present invention.

[0029] Figure 3 This is a schematic structural diagram of a support frame according to an embodiment of the present invention.

[0030] Figure 4 The figure is a schematic structural diagram of a combined bracket according to an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of a hydraulic system according to an embodiment of the present invention.

[0032] Figure 6 The present invention is a flowchart of a construction method according to an embodiment.

[0033] In the above figures, 1 is a support rod, 2 is a support frame, 21 is a vertical rod, 22 is a horizontal rod, 23 is a base, 24 is a support part, 3 is a cone head, 4 is a vertical column, 5 is a movable reaction frame, 51 is an upper beam, 52 is a lower beam, 53 is a column, 6 is a screw, 7 is a connecting rod, 8 is a steel ring, 9 is a propulsion cylinder seat, 10 is a combined bracket, 101 is a support leg, 102 is a horizontal plate, 11 is a stepping hydraulic cylinder seat, 12 is a hydraulic system, 13 is a stepping hydraulic cylinder, 14 is a pump station platform, and 20 is a starting guide platform. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are described below with reference to the accompanying drawings and examples. However, the following examples are only used to illustrate the present invention in detail and are not intended to limit the scope of the present invention in any way.

[0035] In the description of the technical solution of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0036] Unless otherwise specified, the unit modules (components, structures, mechanisms) or sensors and other devices involved in the following embodiments are conventional commercially available products.

[0037] Example 1: A reaction force device for shield starting, see Figures 1 to 5, mainly includes a starting guide platform 20 fixedly set at the bottom of the starting working pit, a mobile reaction frame 5 is slidably set on the starting guide platform 20, the lower part of the mobile reaction frame 5 is connected to the guide rail on the starting guide platform 20 by a welded steel plate, and the gravity of the mobile reaction frame 5 is transmitted to the starting guide platform 20 through the welded steel plate. When the shield machine starts, butter is applied to the guide rail of the starting guide platform 20 to facilitate the movement of the mobile reaction frame 5 on the starting guide platform 20; the mobile reaction frame 5 is formed by an upper crossbeam 51, a lower crossbeam 52 and a column 53 connecting the upper crossbeam 51 and the lower crossbeam 52 Frame; the interior of the frame is provided with an inner ring to enhance its support function, the inner ring is a circular steel ring, and the interior of the four corners of the frame is provided with oblique supports to enhance its stability; the steel ring 8 is connected to the frame through a plurality of connecting rods 7 and is suspended in the shield tail of the shield machine to form a cantilever structure, the connecting rod 7 is welded to the frame to provide support for the steel ring 8, the inner diameter of the shield tail is 8460mm, and the outer diameter of the steel ring 8 is 8300mm; a combined bracket 10 that plays a supporting role is provided below the steel ring 8 and the connecting rod 7, and the combined bracket 10 includes a support leg 101 and a crossbar connecting the support leg 101 Plate 102; and a propulsion cylinder seat 9 is provided on the steel ring 8 at a position corresponding to the propulsion cylinder of the shield machine main body to ensure that the pushing surfaces of all propulsion cylinders are in the same plane; the front end of the mobile reaction frame 5 is provided with a steel ring 8, and the rear end of the mobile reaction frame 5 is provided with 8 horizontally placed support rods 1 distributed at its four corners, and the support rods 1 support the mobile reaction frame 5 through the lining of the starting shaft, and the support rods 1 are installed on a support frame 2 for enhancing its stability; the support frame 2 includes a vertical rod 21 and a horizontal rod 22 connecting the vertical rod 21, and the bottom of the vertical rod 21 is provided with a base 23, and the vertical rod 21 A supporting portion 24 for supporting the support rod 1 is provided on it; the number of the support rods 1 is four groups, with two in each group, which are respectively arranged at the four corners of the rear end of the mobile reaction frame 5, and the two support rods 1 in each group are connected by a vertical column 4, and one end of the stepping hydraulic cylinder 13 supports the mobile reaction frame 5, and the other end supports the vertical column 4; the vertical column 4 is provided with a stepping hydraulic cylinder seat 11 at the pushing position of the stepping hydraulic cylinder 13, and the stepping hydraulic cylinder seat 11 includes four small oil cylinders supporting a wedge-shaped steel plate, and the orientation of the end of the support rod 1 is adjusted by the extension and contraction of the small oil cylinder, and plays a role in fixing the end of the support rod 1.

[0038] The support rod 1 is a single unit steel rod or a plurality of unit steel rods connected together. The length of the unit steel rod corresponds to the width of the tunnel segment and is an integer multiple of the segment width, generally 1.6m or 3.2m, so as to facilitate the support of the mobile reaction frame 5 by increasing the number of the unit steel rods to cooperate with the excavation work of the shield machine. The support rod 1 supports the movable reaction frame 5 through the cone head 3 arranged at its front end, and is powered by the stepping hydraulic cylinder 13 arranged between the support rod 1 and the movable reaction frame 5, so that the movable reaction frame 5 moves along the starting guide platform 20; 6 screws 6 are arranged in the vertical direction of the steel ring 8, which are respectively arranged at 28.5°, 104°, 142°, 218°, 256°, and 331.5° positions on the circumference of the steel ring 8. The end of the screw 6 is pushed into the shield tail of the shield machine through a roller, and the position of the steel ring 8 in the shield tail is adjusted by the screw 6 to ensure that the center point of the steel ring 8 corresponds to the center point of the shield tail of the shield machine.

[0039] The stepping hydraulic cylinder 13, the propulsion cylinder and the small cylinder are equipped with a pump station platform 14 and a hydraulic system 12, which provide support for the entire shield starting work to ensure the normal progress of the shield starting work; the hydraulic system 12 also provides a power basis for multiple transverse oil cylinders and regulating oil cylinders in the shield machine. The transverse oil cylinder and the regulating oil cylinder valve group are connected in parallel, and the actions between the valve groups do not interfere with each other. The valve group uses a speed regulating valve to adjust the overall flow, and the transverse oil cylinder uses a one-way throttle valve to fine-tune the flow; the direction switching control is achieved between the transverse oil cylinder, the regulating oil cylinder and the stepping hydraulic cylinder 13 valve group through a steel ball positioning manual reversing valve; Figure 5 As shown, the stepper hydraulic cylinder 13 is provided with a synchronous motor, which can be adjusted and reversed by a steel ball positioning reversing valve, and can realize simultaneous action (simultaneous operation of the reversing valves) or separate adjustment actions (operation of separate reversing valves). Its valve group is a steel ball positioning type, and its speed can be adjusted by a speed control valve and a throttle valve according to the actual situation on site.

[0040] A suspension frame is provided on each side of the top of the mobile reaction frame 5, and an electric hoist is installed on the suspension frame for installing the cone head 3 and the unit steel rod; the suspension frame includes a triangular structure formed by vertical, horizontal and inclined I-beams, and one corner of the triangular structure is welded to the mobile reaction frame 5; the installation of the cone head 3 and the unit steel rod is carried out through the suspension frame, which greatly facilitates the starting work on site and improves construction efficiency; the mobile reaction frame 5 adopts a steel structure to give it sufficient rigidity, strength and stability so that it can withstand the reaction force during the advancement of the shield machine.

[0041] Example 2: A shield starting construction method based on the above-mentioned shield starting reaction device, the main working process of which is: install the mobile reaction frame on the starting guide rail, suspend the steel ring in the shield tail through the connecting rod at the front of the mobile reaction frame, and support the rear part on the inner wall of the starting working shaft through the support rod. 19 thrust cylinder seats made of welded steel plates are provided at the pushing positions of the 19 thrust cylinders of the shield machine on the steel ring in the shield tail, and the thrust cylinders are supported on the corresponding thrust cylinder seats. There are 6 screws distributed along the circumference of the steel ring, which are perpendicular to the steel ring. The relative position of the steel ring in the shield tail can be corrected by rotating the extended length of the screw. There are 4 steel supports on each of the left and right sides of the rear of the mobile reaction frame, and the upper and lower support rods are connected to the reaction frame through cone head supports. There is a stepping hydraulic cylinder between the mobile reaction frame and the support rod, one end of the stepping hydraulic cylinder is fixed on the mobile reaction frame, and the other end is pressed against the vertical column of the cone head, and the vertical column is a vertical I-beam; the shield machine excavates forward 1.8m (ring width + 0.2m), retracts the propulsion cylinder, and then the stepping hydraulic cylinder pushes the reaction frame to slide forward 1.8m on the guide rail of the starting guide platform, retracts the stepping hydraulic cylinder, removes the cone head, and then installs a 1.6m support rod or replaces it with a 3.2m support rod, and finally installs the cone head, uses the shield machine propulsion cylinder to push the mobile reaction frame back 0.2m, docks it with the cone head, and then uses 4 small cylinders to adjust the direction of the cone head and fix it firmly, repeats the above steps until the reaction frame reaches the final state, and completes the starting work.

[0042] Specifically, the B4 shield tunnel project of the Pearl River Delta Water Resources Allocation Project is used as an example to illustrate the construction method. This shield tunnel project uses an earth pressure shield with an excavation diameter of 8.64 meters, a total length of 110 meters, and a main machine length of 11.4 meters. The shield machine starts with a mobile reaction frame combination system. The shield machine advances the tunnel through the use of the mobile reaction frame, and no abnormal phenomena occur. Its construction flow chart can be found in Figure 6 , mainly includes the following steps:

[0043] (1) According to the design requirements, the mileage control points of the mobile reaction frame are set on the track of the starting guide platform, and the measurement points are set at the four corners of the mobile reaction frame in advance to facilitate the installation of the mobile reaction frame;

[0044] (2) Install and position the mobile reaction frame according to the positioning line, and apply butter on the starting guide platform track to ensure the movement of the mobile reaction frame; when installing the mobile reaction frame, detect the verticality and left and right offset of the mobile reaction frame as a whole through four measuring points to ensure that the center point of the mobile reaction frame is on the same horizontal line as the center point of the starting shield machine; after applying butter, start hoisting the pre-installed reaction frame block and ring beam bottom block assembly, and weld and reinforce the assembly, and then carry out the following steps respectively:

[0045] 1) According to the points set by the measurement team, process and manufacture the steel plates for horizontal supports and columns; measure the embedded steel plates and add wedge-shaped pads for leveling.

[0046] 2) Vertical support and horizontal support installation.

[0047] 3) The reaction frame and the steel ring base block are hoisted into place and connected with support rods.

[0048] 4) Lift them in sequence and connect the reaction frame to the left block, right block and top block of the steel ring with support rods.

[0049] 5) Install the anti-tilt horizontal support at the bottom of the reaction frame.

[0050] 6) Install the cone head between the support rod and the reaction frame.

[0051] 7) Install anti-floating, stepping and wedge cylinders.

[0052] 8) Move the steel ring to the inside of the shield tail, adjust the gap between the steel ring and the shield tail, and remove the anti-tilt support.

[0053] 9) Replace the 1600mm support rod with the 3200mm support rod and continue stepping to the shield tail position.

[0054] (3) When the shield machine starts, after it advances 1800mm, the mobile reaction frame also advances 1800mm, and the cone head is removed, and a 1600mm unit steel rod is installed. The removed cone head is then installed on the new unit steel rod. The mobile reaction frame is pushed back 200mm by the main propulsion cylinder of the shield machine, so that the mobile reaction frame and the cone head are docked and assembled, and the cylinder gap is adjusted with a wedge block; (Before the mobile reaction frame is pushed by the stepping hydraulic cylinder, the inner steel ring of the shield tail should be observed. Whether there are obstacles such as pipelines and equipment on the route of the mobile reaction frame, they need to be cleared. Also check whether the reserved extension of various pipelines carried by the reaction frame is sufficient. If not, Measures such as dragging the pipeline or extending it are required to ensure the pre-extension of the pipeline. The stepper hydraulic cylinder slowly pushes the reaction frame to slide forward on the starting guide platform. During the sliding process, pay attention to keeping the four stepper hydraulic cylinders extended synchronously, and the extension amount is consistent, with a deviation within 5mm. During the overall pushing process, check whether the mobile reaction frame is stable, whether there is a tendency to tilt, the gap between the steel ring in the shield tail and the shield tail, and whether it slides normally in the shield tail. After the mobile reaction frame is pushed into place, the measurement team measures the measurement points reserved at the four corners of the mobile reaction frame, and judges its status based on the measurement data to ensure the posture of the reaction frame body. This cycle is repeated to complete the shield starting work.

[0055] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, those skilled in the art will appreciate that, without departing from the spirit of the present invention, the specific parameters in the above embodiments may be changed, or related components, structures, and materials may be replaced with equivalents, thereby forming multiple specific embodiments. These are all common variations of the present invention and will not be described in detail here.

Claims

1. A shield starting reaction device, comprising a starting guide platform fixedly arranged at the bottom of the starting working pit, characterized in that: A movable reaction frame is slidably provided on the launching guide platform, a steel ring is provided at the front end of the movable reaction frame, and a plurality of horizontal support rods distributed at the four corners of the movable reaction frame are provided at the rear end of the movable reaction frame. The support rods support the movable reaction frame through the lining of the launching well, and the support rods are installed on a support frame for enhancing its stability; The support rod is a single unit steel rod or a plurality of unit steel rods connected together, and the support rod supports the movable reaction frame through a cone head arranged at the front end thereof, and is powered by a stepping hydraulic cylinder arranged between the support rod and the movable reaction frame, so that the movable reaction frame moves along the starting guide platform; There are four groups of support rods, two in each group, which are respectively arranged at the four corners of the rear end of the mobile reaction frame, and the two support rods in each group are connected by a vertical column. The vertical column is provided with a stepping hydraulic cylinder seat at the pushing position of the stepping hydraulic cylinder. The stepping hydraulic cylinder seat includes four small oil cylinders supporting a wedge-shaped steel plate. The orientation of the end of the support rod is adjusted by the extension and retraction of the small oil cylinder, and plays a role in fixing the end of the support rod.

2. The shield starting reaction device according to claim 1, characterized in that: The mobile reaction frame includes a frame formed by an upper crossbeam, a lower crossbeam and columns connecting the upper crossbeam and the lower crossbeam; an inner ring is provided inside the frame, and the inner ring is a circular steel ring. The four corners of the frame are provided with inclined supports to enhance its stability; the steel ring is connected to the frame through multiple connecting rods and is suspended inside the shield tail of the shield machine to form a cantilever structure.

3. The shield starting reaction device according to claim 1, characterized in that: A plurality of screw rods are arranged in the vertical direction of the steel ring, and the ends of the screw rods are pushed into the shield tail of the shield machine through rollers, and the position of the steel ring in the shield tail is adjusted by the screw rods.

4. The shield starting reaction device according to claim 3, characterized in that: The number of the screws is 6, and they are respectively arranged at 28.5°, 104°, 142°, 218°, 256°, and 331.5° of the circumference of the steel ring to ensure that the center point of the steel ring corresponds to the center point of the shield tail of the shield machine.

5. The shield starting reaction device according to claim 1, characterized in that: The support frame includes a vertical rod and a horizontal rod connecting the vertical rod. A base is provided at the bottom of the vertical rod, and a support portion for supporting the support rod is provided on the vertical rod. One end of the stepping hydraulic cylinder supports the movable reaction frame, and the other end supports the vertical column.

6. The shield starting reaction device according to claim 5, characterized in that: A propulsion cylinder seat is provided on the steel ring at a position corresponding to the propulsion cylinder of the shield machine main body to ensure that the top pushing surfaces of all the propulsion cylinders are in the same plane.

7. The shield starting reaction device according to claim 1, characterized in that: The length of the unit steel rod is consistent with the width of the tunnel segment, so as to facilitate supporting the movable reaction frame by increasing the number of the unit steel rods to cooperate with the starting work of the shield machine.

8. The shield starting reaction device according to claim 1, characterized in that: At least two suspension frames are provided on the top of the mobile reaction frame, and electric hoists are installed on the suspension frames for installing the cone head and the unit steel rod; the suspension frame includes a triangular structure formed by vertical, horizontal and inclined I-beams, and one corner of the triangular structure is welded to the mobile reaction frame.

9. A shield starting construction method based on the shield starting reaction device according to claim 1, characterized in that: The steps include: (1) According to the design requirements, the mileage control points of the mobile reaction frame are set on the track of the starting guide platform, and the measurement points are set at the four corners of the mobile reaction frame in advance to facilitate the installation of the mobile reaction frame; (2) Install and position the mobile reaction frame according to the positioning line; and detect the verticality and left and right offset of the mobile reaction frame as a whole through the measurement points in step (1) to ensure that it is installed in place; (3) The shield starts and moves forward a certain distance. The mobile reaction frame moves forward the same distance, removes the cone head, and installs the unit steel rod. The removed cone head is then installed on the new unit steel rod. The mobile reaction frame is pushed back to connect and assemble with the cone head. This cycle is repeated to complete the start of the shield.

10. The shield starting construction method according to claim 9, characterized in that: In the step (2), when installing the mobile reaction frame, butter should be applied to the starting guide platform track to ensure the movement of the mobile reaction frame; in the step (3), the mobile reaction frame is pushed back by the shield machine main engine propulsion cylinder, so that the mobile reaction frame is docked and assembled with the cone head, and the cylinder gap is adjusted with a wedge block.

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