Transformation method for passive hinged shield tunneling machine and double-hinged shield tunneling machine

Abstract

The invention relates to a transformation method for a passive hinged shield tunneling machine and a double-hinged shield tunneling machine. The transformation method comprises the steps that a front shield of the passive hinged shield tunneling machine is dismantled, a middle folding shield and a newly-manufactured front shield are sequentially added to the side, away from a tail shield, of a middle shield, and an active hinged device is arranged between the middle folding shield and the newly-manufactured front shield; therefore, the newly-manufactured front shield and the middle folding shield can relatively swing; and the end, facing the newly-manufactured front shield, of the screw conveyor is lengthened, the lengthened screw conveyor is movably connected relative to the newly-manufactured front shield, and the lengthened screw conveyor is slidably connected relative to the middle shield in the axis direction of the passive hinged shield tunneling machine, so that the lengthened screw conveyor can swing relative to the newly-manufactured front shield. According to the technical scheme, the construction requirements of special strata can be met, the construction cost can be reduced, and the transformation period can be shortened.

Description

Technical Field

[0001] The present application relates to the technical field of shield equipment modification, and in particular to a modification method for a passive articulated shield machine and a double-articulated shield machine. Background Art

[0002] As a high-tech, high-reliability, high-efficiency and high-value-added high-end equipment for tunnel construction, shield machines are increasingly widely used. According to incomplete statistics, the number of shield machines in China has exceeded 3,000 so far, and a large number of idle shield machines need to be adapted after leaving the factory due to their own structural size constraints.

[0003] Due to the differences in the strata of various cities in China, there are great differences in the adaptability requirements for shield machines. When tunneling in hard rock strata or small turning radius tunnels, active articulated shield machines are often required to ensure construction efficiency and flexible steering. However, due to the low construction and maintenance costs and simple operation of passive articulated shield machines, most of the shield machines retained in China in the early stage were of this type, but passive articulated shield machines are increasingly unable to adapt to the complex tunnel construction needs. Summary of the invention

[0004] Based on the above statements, the present application provides a modification method for a passive articulated shield machine and a double-articulated shield machine. By modifying the passive articulated shield machine into a double-articulated shield machine, it can not only meet the construction requirements of special strata, but also reduce the construction cost and shorten the modification period.

[0005] According to a first aspect, the present application provides a modification method for a passive articulated shield machine, wherein the passive articulated shield machine comprises a front shield, a middle shield, a rear shield, a propulsion cylinder, a passive articulation device and a screw machine, and the modification method comprises: The front shield of the passive articulated shield machine is removed, and a middle folding shield and a new front shield are added in sequence on the side of the middle shield away from the tail shield, and an active articulation device is provided between the middle folding shield and the new front shield so that the new front shield and the middle folding shield can swing relative to each other; The screw machine is lengthened toward one end of the newly made front shield, the lengthened screw machine is movably connected to the newly made front shield, and the lengthened screw machine is slidably connected to the middle shield along the axis direction of the passive articulated shield machine, so that the lengthened screw machine can swing relative to the newly made front shield; The propulsion cylinder is used to provide propulsion power; the passive articulation device is used to achieve relative swinging of the middle shield and the tail shield.

[0006] In one or more embodiments, the active articulation device comprises a plurality of articulation cylinders, and the plurality of articulation cylinders are arranged between the newly manufactured front shield and the middle folding shield along the inner circumference of the newly manufactured front shield and the middle folding shield.

[0007] In one or more embodiments, lengthening the end of the screw machine toward the newly made front shield includes: connecting an extension cylinder and a lengthening machine shaft to the end of the screw machine toward the newly made front shield.

[0008] In one or more embodiments, the newly manufactured front shield is provided with a mounting cylinder on one side close to the screw machine, a ball joint device is provided between the mounting cylinder and the extension cylinder, the fixed end of the ball joint device is connected to the mounting cylinder, and the movable end of the ball joint device is connected to the extension cylinder; The extended shaft passes through the extended cylinder, the ball joint device and the installation cylinder in sequence.

[0009] In one or more embodiments, the step of slidingly connecting the lengthened screw machine to the middle shield of the passive articulated shield machine along the axial direction of the passive articulated shield machine comprises: A walking beam and a sliding connection seat are arranged on the crossbeam in the middle shield; the lengthened screw machine is connected to the sliding connection seat; and the sliding connection seat is slidably arranged relative to the walking beam along the axial direction of the passive articulated shield machine.

[0010] In one or more embodiments, slidably arranging the sliding connection seat relative to the walking beam along the axis direction of the passive articulated shield machine includes: A slide rail is arranged on the walking beam; the sliding connection seat comprises a seat body, a connection structure and a slider, the seat body is connected to the slider via the connection structure, and the seat body is connected to the lengthened screw machine, and the slider is arranged in the slide rail.

[0011] In one or more embodiments, it further includes: a through oil filling hole is opened on the seat body and the connecting structure, and the oil outlet end of the oil filling hole is arranged toward the sliding block.

[0012] In one or more embodiments, a hinged sealing device is provided between the newly manufactured front shield and the middle folding shield, and the middle folding shield and the middle shield are connected by flanges and bolts.

[0013] In one or more embodiments, the rear supporting devices, hydraulic system and electrical system of the passive articulated shield machine are retained for use.

[0014] According to a second aspect, the present application provides a double-articulated shield machine, including a middle shield, a tail shield, a propulsion cylinder, a passive articulation device and a screw machine of a passive articulated shield machine, and also includes: a newly manufactured front shield, a middle folding shield and an active articulation device; The side of the middle shield facing away from the tail shield is connected to the middle folding shield and the newly made front shield in sequence, and an active hinge device is arranged between the middle folding shield and the newly made front shield so that the middle folding shield and the newly made front shield can swing relative to each other; The lengthened screw machine is movably connected to the newly made front shield, and the lengthened screw machine is slidably connected to the middle shield along the axis direction of the passive articulated shield machine, so that the lengthened screw machine can swing relative to the newly made front shield; The propulsion cylinder is used to provide propulsion power; the passive articulation device is used to achieve relative swinging of the middle shield and the tail shield.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: In the above-mentioned modification method for a passive articulated shield machine and a double-articulated shield machine, the front shield of the passive articulated shield machine is removed, a middle folding shield and a new front shield are added in sequence on the side of the middle shield away from the tail shield, and an active articulation device is provided between the middle folding shield and the new front shield, so that the middle folding shield can swing relative to the new front shield. By lengthening the screw machine toward one end of the newly made front shield to adapt to the change in the shield length of the passive articulated shield machine; by movably connecting the lengthened screw machine relative to the newly made front shield, and slidingly connecting the lengthened screw machine relative to the middle shield along the axial direction of the passive articulated shield machine, during the swing of the new front shield relative to the middle folding shield and the swing of the middle shield relative to the tail shield, the lengthened screw machine can make corresponding swinging movements to cooperate with the modified passive articulated shield machine to perform arc-shaped or S-shaped small-angle turning movements. In this way, the original idle passive articulated shield machine is transformed into a double-articulated shield machine, which not only meets the adaptability requirements of the shield machine to different geological conditions and small curve radius tunnels, but also can reduce the construction cost and shorten the modification period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of a conventional passive articulated shield machine; Figure 2 It is a structural schematic diagram of a double-articulated shield machine obtained by transforming a passive articulated shield machine in an embodiment of the present application; Figure 3 This is a schematic diagram of the layout of multiple active hinge devices in an embodiment of the present application; Figure 4 for Figure 3 Schematic diagram of the cross section obtained along the AA section; Figure 5 It is a cross-sectional schematic diagram of the folding shield in the embodiment of the present application; Figure 6 for Figure 2 Schematic diagram of the partial structure of the screw machine after transformation; Figure 7 for Figure 2 Schematic diagram of the cross-sectional structure of the screw machine after modification.

[0017] Description of Figure Numbers: Passive articulated shield machine 100; A front shield 101 receiving a cylinder 101a; Zhongdun 102; tail shield 103; Propulsion cylinder 104; Passive articulation device 105; Screw machine 106, lengthened cylinder E, lengthened machine shaft F; Tube segment 107; A new front shield 201 is made and a cylinder 201a is installed; Middle folding shield 202, outer shell 2021, front flange 2022, rear flange 2023, rib plate 2024, stop r; Active articulation device 203, front articulation seat 2031, rear articulation seat 2032, pin 2033, articulation cylinder K; Ball joint device G; Walking beam 204, track arm 2041, slide rail 204a; Sliding connection seat 205, seat body 2051, connection structure 2052, slider 2053; Articulated sealing device 206; Oil filling hole h. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0020] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0021] Due to the differences in the strata of various cities in China, there are great differences in the adaptability requirements for shield machines. When tunneling in hard rock strata or small turning radius tunnels, active articulated shield machines are often required to ensure construction efficiency and flexible steering. However, due to the low construction and maintenance costs and simple operation of passive articulated shield machines, most of the shield machines retained in China in the early stage were of this type, but the retained passive articulated shield machines are increasingly unable to adapt to the complex tunnel construction needs in China.

[0022] At present, the passive articulated shield machine is generally used in China. By manufacturing new front shields, middle shields, tail shields, propulsion cylinders and articulated cylinders, the passive articulated shield machine's rear accessories, hydraulic system, electrical system, etc. are reused. This solution has high transformation costs, long cycles and great difficulty. Therefore, construction units and host manufacturers are in urgent need of a low-cost, high-efficiency passive articulated shield machine transformation solution to meet the shield machine's active articulation construction needs after the transformation.

[0023] Based on this, the present application provides a modification method for a passive articulated shield machine and a double-articulated shield machine. By modifying the passive articulated shield machine into a double-articulated shield machine, it can not only meet the construction requirements of special strata, but also reduce the construction cost and shorten the modification period.

[0024] Figure 1 The structure diagram of the passive articulated shield machine in the related art is shown; Figure 2 A schematic structural diagram of a double-articulated shield machine obtained by modifying a passive articulated shield machine in an embodiment of the present application is shown.

[0025] See also Figure 1 and Figure 2 The embodiment of the present application provides a modification method for a passive articulated shield machine 100, wherein the passive articulated shield machine 100 includes a front shield 101, a middle shield 102, a rear shield 103, a thrust cylinder 104, a passive articulated device 105, and a screw machine 106. The modification method comprises: removing the front shield 101 of the passive articulated shield machine 100, sequentially adding a middle folding shield 202 and a newly made front shield 201 on the side of the middle shield 102 away from the rear shield 103, and setting an active articulated device 203 between the middle folding shield 202 and the newly made front shield 201 so that the new The front shield 201 and the middle folding shield 202 can swing relative to each other; the screw machine 106 is lengthened toward one end of the new front shield 201, the lengthened screw machine 106 is movably connected relative to the new front shield 201, and the lengthened screw machine 106 is slidably connected relative to the middle shield 102 along the axial direction of the passive articulated shield machine 100, so that the lengthened screw machine 106 can swing relative to the new front shield 201; the propulsion cylinder 104 is used to provide propulsion power; the passive articulation device 105 is used to realize the relative swing of the middle shield 102 and the tail shield 103.

[0026] A conventional passive articulated shield machine 100 includes a front shield 101, a middle shield 102, a rear shield 103, a thrust cylinder 104, a passive articulated device 105 and a screw machine 106, wherein the front shield 101, the middle shield 102 and the rear shield 103 are connected in sequence to form a shield body, the passive articulated device 105 includes a plurality of articulated cylinders K, a plurality of thrust cylinders 104 are provided, the thrust cylinder 104 is arranged inside the middle shield 102, the passive articulated device 105 is arranged inside the middle shield 102 and the rear shield 103, each thrust cylinder 104 is connected in series with an articulated cylinder K corresponding to the passive articulated device 105, and the thrust cylinder 104 acts on the pipe segment 107 through the support shoe at the end of the articulated cylinder K of the passive articulated device 105, providing the shield machine with forward power. The multiple articulated cylinders of the passive articulated device 105 are used to realize the relative swing of the middle shield 102 and the tail shield 103, and keep the posture following during the tunneling process of the shield machine.

[0027] A conventional passive articulated shield machine 100 is modified by removing the front shield 101 of the passive articulated shield machine 100, and sequentially adding a middle folding shield 202 and a newly made front shield 201 on the side of the middle shield 102 away from the tail shield 103, and arranging an active articulation device 203 between the middle folding shield 202 and the newly made front shield 201. In this way, the passive articulated shield machine 100 is transformed into a double-articulated shield machine. Under the action of the active articulation device 203, the newly made front shield 201 can swing relative to the middle folding shield 202, and under the action of the passive articulation device 105, the middle shield 102 can swing relative to the tail shield 103, so that an arc-shaped or S-shaped small-angle turning effect can be achieved, thereby improving the flexibility and steerability of shield tunneling construction. The screw machine 106 is lengthened toward one end of the newly manufactured front shield 201 to adapt to the change in the shield length of the passive articulated shield machine 100; the lengthened screw machine 106 is movably connected to the newly manufactured front shield 201, and the lengthened screw machine 106 is slidably connected to the middle shield 102 along the axis direction of the passive articulated shield machine 100. In the process of the swing of the newly manufactured front shield 201 relative to the middle folding shield 202 and the swing of the middle shield 102 relative to the tail shield 103, the lengthened screw machine 106 can make a corresponding swinging motion to cooperate with the modified passive articulated shield machine 100 to perform an arc-shaped or S-shaped small-angle turning motion, while avoiding damage to the screw machine 106. In this way, by transforming the passive articulated shield machine 100 into a double-articulated shield machine, not only can the construction requirements of special strata be met, but also most of the structure of the passive articulated shield machine 100 can be reused, which can reduce the construction cost and shorten the transformation period.

[0028] Continue reading Figure 2 , and combined with Figure 3 and Figure 4 , Figure 3 The schematic diagram of the layout of multiple active hinge devices in the embodiment of the present application is shown. Figure 4 Shows Figure 3Schematic diagram of the cross section obtained along the AA section.

[0029] In some embodiments, the active articulation device 203 includes multiple articulation cylinders K. The multiple articulation cylinders K corresponding to the multiple active articulation devices 203 are arranged between the new front shield 201 and the middle folding shield 202 along the inner circumference of the new front shield 201 and the middle folding shield 202. The turning posture control between the new front shield 201 and the middle folding shield 202 is achieved through the stroke difference of the articulation cylinders K in different partitions.

[0030] Continue reading Figures 2 to 4 , and combined with Figure 5 ; Figure 5 A schematic cross-sectional structure diagram of a folding shield in an embodiment of the present application is shown.

[0031] In this embodiment, the articulated oil cylinder K of the active articulated device 203 is connected to the newly manufactured front shield 201 through the front articulated seat 2031, and is connected to the middle folding shield 202 through the rear articulated seat 2032. The articulated oil cylinder K is respectively connected to the front articulated seat 2031 and the rear articulated seat 2032 through the pin 2033. Further, the middle folding shield 202 includes an outer shell 2021, a front end flange 2022, a rear end flange 2023 and a rib plate 2024, and the outer shell 2021, the front end flange 2022, the rear end flange 2023 and the rib plate 2024 form a stable frame structure. In a specific embodiment, a plurality of rear hinge seats 2032 of the active hinge device 203 are welded to the front end flange 2022 of the middle folding shield 202 along the inner circumference of the middle folding shield 202, and the middle folding shield 202 is connected to the middle shield 102 through the rear end flange 2023 and bolts, and the middle shield 102 and the middle folding shield 202 are installed in coordination by providing a stopper r and a positioning pin (not shown in the figure) on the rear end flange 2023.

[0032] Continue reading Figure 1 and Figure 2 In some embodiments, lengthening the end of the screw machine 106 toward the newly manufactured front shield 201 includes: connecting an extension cylinder E and an extension shaft F at the end of the screw machine 106 toward the newly manufactured front shield 201. The screw machine 106 is lengthened by welding the extension shaft F to the original shaft of the screw machine 106 and connecting the extension cylinder E to the original cylinder of the screw machine 106 through flanges and bolts to adapt to the change in the shield length of the passive articulated shield machine 100.

[0033] See also Figure 6 , Figure 6 Shown as Figure 2Schematic diagram of the partial structure of the screw machine after the transformation. In this embodiment, the new front shield 201 is provided with a mounting cylinder 201a on the side close to the screw machine 106, and a ball joint device G is provided between the mounting cylinder 201a and the extension cylinder E, the fixed end of the ball joint device G is connected to the mounting cylinder 201a, and the movable end of the ball joint device G is connected to the extension cylinder E; the extension shaft F passes through the extension cylinder E, the ball joint device G and the mounting cylinder 201a in sequence. By providing a ball joint device G between the mounting cylinder 201a of the new front shield 201 and the extension cylinder E of the screw machine 106. The ball joint device G includes an outer cup sleeve and an inner sphere. The outer cup sleeve of the ball joint device G is fixedly connected to the mounting cylinder 201a of the newly manufactured front shield 201 through a flange and bolts, and the inner sphere of the ball joint device G is connected to the extended cylinder E through a flange and bolts, that is, the fixed end of the ball joint device G is connected to the mounting cylinder 201a, and the movable end of the ball joint device G is connected to the extended cylinder E, so that the cylinder of the screw machine 106 can be rotated at the front end through the ball joint device G, which helps to realize the up and down swing of the screw machine 106 within a certain angle range, so as to cooperate with the modified passive articulated shield machine 100 to perform arc-shaped or S-shaped small-angle turning actions, and at the same time avoid damage to the screw machine 106.

[0034] Continue reading Figure 1 and Figure 2 , and combined with Figure 7 , Figure 7 Shows Figure 2 Schematic diagram of the cross-sectional structure of the screw machine after modification.

[0035] In some embodiments, the lengthened screw machine 106 is slidably connected to the middle shield 102 of the passive articulated shield machine 100 along the axial direction of the passive articulated shield machine 100, including: arranging a walking beam 204 and a sliding connection seat 205 on the crossbeam in the middle shield 102; connecting the lengthened screw machine 106 to the sliding connection seat 205; and slidably arranging the sliding connection seat 205 relative to the walking beam 204 along the axial direction of the passive articulated shield machine 100. It should be noted that the screw machine 106 of the conventional passive articulated shield machine 100 is fixed to the crossbeam in the middle shield 102 through a fixing seat, and the front end of the screw machine 106 is fixed to the receiving cylinder 101a of the front shield 101, that is, the screw machine 106 of the conventional passive articulated shield machine 100 is rigidly fixed and cannot be swung. In this embodiment, a walking beam 204 and a sliding connection seat 205 are arranged on the crossbeam in the middle shield 102; the lengthened screw machine 106 is connected to the sliding connection seat 205; the sliding connection seat 205 is slidably arranged relative to the walking beam 204 along the axial direction of the passive articulated shield machine 100. In this way, based on the fact that the lengthened screw machine 106 and the newly manufactured front shield 201 can rotate relative to each other, and the lengthened screw machine 106 can slide back and forth along the axial direction of the passive articulated shield machine 100, the screw machine 106 can be made to swing up and down within a certain angle range, so as to cooperate with the modified passive articulated shield machine 100 to perform arc-shaped or S-shaped small-angle turning actions, while avoiding damage to the screw machine 106.

[0036] Furthermore, the sliding connection seat 205 is slidably arranged relative to the walking beam 204 along the axial direction of the passive articulated shield machine 100, including: a slide rail 204a is arranged on the walking beam 204; the sliding connection seat 205 includes a seat body 2051, a connecting structure 2052 and a slider 2053, the seat body 2051 is connected to the slider 2053 through the connecting structure 2052, and the seat body 2051 is connected to the lengthened screw machine 106, and the slider 2053 is arranged in the slide rail 204a.

[0037] Specifically, the walking beam 204 is fixed on the cross beam in the middle shield 102, and the walking beam 204 has two track arms 2041 opposite to each other, each track arm 2041 is provided with a corresponding slide rail 204a, each slide rail 204a is provided with a slider 2053, both sides of the seat body 2051 are connected to a corresponding slider 2053 through a connecting structure 2052, and the lengthened screw machine 106 is welded in the seat body 2051. In this way, the lengthened screw machine 106 can slide forward and backward along the axis direction of the passive articulated shield machine 100.

[0038] Continue reading Figure 7In some embodiments, the invention further comprises: an oil injection hole h is provided through the seat body 2051 and the connecting structure 2052, and the oil outlet end of the oil injection hole h is arranged toward the slider 2053. In this way, it is convenient to inject lubricating oil, so as to reduce the sliding friction between the slider 2053 and the slide rail 204a, and improve the smoothness of the sliding of the lengthened screw machine 106.

[0039] Continue reading Figure 2 In some embodiments, a hinged sealing device 206 is provided between the newly manufactured front shield 201 and the middle folding shield 202, and the middle folding shield 202 and the middle shield 102 are connected by flanges and bolts. In this embodiment, the hinged sealing device 206 is a conventional technology. By providing the hinged sealing device 206 between the newly manufactured front shield 201 and the middle folding shield 202, it is possible to prevent the outer soil residue from leaking into the shield body.

[0040] Continue reading Figure 1 In some embodiments, the rear supporting devices, hydraulic system and electrical system of the passive articulated shield machine 100 are retained for use. In this way, the structure of the passive articulated shield machine 100 can be reused to the maximum extent to reduce the transformation cost and shorten the transformation period.

[0041] See also Figure 1 and Figure 2 Based on the same inventive concept, the embodiment of the present application also provides a double-articulated shield machine, including a middle shield 102, a tail shield 103, a propulsion cylinder 104, a passive articulated device 105 and a screw machine 106 of a passive articulated shield machine 100, and the double-articulated shield machine also includes a newly made front shield 201, a middle folding shield 202 and an active articulated device 203; the side of the middle shield 102 away from the tail shield 103 is connected to the middle folding shield 202 and the newly made front shield 201 in sequence, and the active articulated device 203 is arranged between the middle folding shield 202 and the newly made front shield The middle shield 202 and the new front shield 201 are connected to each other so that the middle folding shield 202 and the new front shield 201 can swing relative to each other; the lengthened screw machine 106 is movably connected to the new front shield 201, and the lengthened screw machine 106 is slidingly connected to the middle shield 102 along the axial direction of the passive articulated shield machine 100 so that the lengthened screw machine 106 can swing relative to the new front shield 201; the propulsion cylinder 104 is used to provide propulsion power; the passive articulation device 105 is used to realize the relative swing of the middle shield 102 and the tail shield 103.

[0042] In summary, the original idle passive articulated shield machine 100 is transformed and upgraded to meet the adaptability requirements of the shield machine for different geological conditions and small curve radius tunnels; the middle shield 102, tail shield 103, thrust cylinder 104, passive articulated device 105 and screw machine 106 of the passive articulated shield machine 100 are recycled, and new front shield 201, middle folding shield 202, active articulated device 203, ball joint device G, extended cylinder E of the screw machine 106, extended machine shaft F, walking beam 204 and sliding connection seat 205 and other structures are made to realize a double-articulated shield machine, shorten the shield machine transformation cycle, reduce the transformation cost, and revitalize the idle shield machine. The transformed shield machine can meet the active articulation construction requirements of the shield machine.

[0043] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for modifying a passive articulated shield machine, the passive articulated shield machine comprising a front shield, a middle shield, a rear shield, a propulsion cylinder, a passive articulated device and a screw machine, characterized in that: The transformation method comprises: The front shield of the passive articulated shield machine is removed, and a middle folding shield and a new front shield are added in sequence on the side of the middle shield away from the tail shield, and an active articulation device is provided between the middle folding shield and the new front shield so that the new front shield and the middle folding shield can swing relative to each other; The screw machine is lengthened toward one end of the newly made front shield, the lengthened screw machine is movably connected to the newly made front shield, and the lengthened screw machine is slidably connected to the middle shield along the axis direction of the passive articulated shield machine, so that the lengthened screw machine can swing relative to the newly made front shield; The propulsion cylinder is used to provide propulsion power; the passive articulation device is used to achieve relative swinging of the middle shield and the tail shield.

2. The modification method for a passive articulated shield machine according to claim 1, characterized in that: The active articulation device comprises a plurality of articulation oil cylinders, and the plurality of articulation oil cylinders are arranged between the newly manufactured front shield and the middle folding shield along the inner circumference of the newly manufactured front shield and the middle folding shield.

3. The modification method for a passive articulated shield machine according to claim 1, characterized in that: Lengthening the end of the screw machine toward the newly made front shield comprises: connecting a lengthened cylinder and a lengthened machine shaft to the end of the screw machine toward the newly made front shield.

4. The modification method for a passive articulated shield machine according to claim 3, characterized in that: The newly manufactured front shield is provided with a mounting cylinder on one side close to the screw machine, a ball joint device is provided between the mounting cylinder and the extension cylinder, the fixed end of the ball joint device is connected to the mounting cylinder, and the movable end of the ball joint device is connected to the extension cylinder; The extended shaft passes through the extended cylinder, the ball joint device and the installation cylinder in sequence.

5. The modification method for a passive articulated shield machine according to any one of claims 1 to 4, characterized in that: The step of slidingly connecting the lengthened screw machine to the middle shield along the axis direction of the passive articulated shield machine comprises: A walking beam and a sliding connection seat are arranged on the crossbeam in the middle shield; the lengthened screw machine is connected to the sliding connection seat; and the sliding connection seat is slidably arranged relative to the walking beam along the axial direction of the passive articulated shield machine.

6. The modification method for a passive articulated shield machine according to claim 5, characterized in that: The step of slidably arranging the sliding connection seat relative to the walking beam along the axis direction of the passive articulated shield machine comprises: A slide rail is arranged on the walking beam; the sliding connection seat comprises a seat body, a connection structure and a slider, the seat body is connected to the slider via the connection structure, and the seat body is connected to the lengthened screw machine, and the slider is arranged in the slide rail.

7. The modification method for a passive articulated shield machine according to claim 6, characterized in that: Also includes: A through oil filling hole is provided on the seat body and the connecting structure, and an oil outlet end of the oil filling hole is arranged toward the sliding block.

8. The modification method for a passive articulated shield machine according to any one of claims 1 to 4, characterized in that: A hinged sealing device is arranged between the newly manufactured front shield and the middle folding shield, and the middle folding shield and the middle shield are connected by flanges and bolts.

9. The modification method for a passive articulated shield machine according to any one of claims 1 to 4, characterized in that: The rear supporting devices, hydraulic system and electrical system of the passive articulated shield machine are retained for use.

10. A double-articulated shield machine, comprising a middle shield, a tail shield, a propulsion cylinder, a passive articulated device and a screw machine of a passive articulated shield machine, characterized in that: Also includes: New front shield, mid-folding shield and active articulation device; The side of the middle shield facing away from the tail shield is connected to the middle folding shield and the newly made front shield in sequence, and an active hinge device is arranged between the middle folding shield and the newly made front shield so that the middle folding shield and the newly made front shield can swing relative to each other; The lengthened screw machine is movably connected to the newly made front shield, and the lengthened screw machine is slidably connected to the middle shield along the axis direction of the passive articulated shield machine, so that the lengthened screw machine can swing relative to the newly made front shield; The propulsion cylinder is used to provide propulsion power; the passive articulation device is used to achieve relative swinging of the middle shield and the tail shield.

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