Metro station shield path analogue simulation U-turn construction method

Abstract

The invention relates to the technical field of shield construction, and provides a subway station shield path analogue simulation U-turn construction method which comprises the following steps: establishing a three-dimensional model of a subway station, and simulating and generating a shield tunneling machine U-turn path and a rear matched trolley path; importing the three-dimensional model into test software, adding the motion path generated by simulation, and performing three-dimensional collision inspection; exporting constraint force position data; based on the shield tunneling machine U-turn path generated through simulation and the exported constraining force position data, a supporting piece is installed; the bracket and the shield tunneling machine on the bracket are pushed by the jack, so that the shield tunneling machine moves to a target position according to the shield tunneling machine turning-around path generated through simulation; trolley bodies of the rear matched trolley are fixed to the U-turn platform one by one, and the U-turn platform where the trolley bodies are fixed is dragged by a battery car to move to the starting side platform area. According to the method, path analogue simulation and site construction optimization are combined, the U-turn construction path is effectively controlled, the construction efficiency is greatly improved, and the construction safety risk is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of shield construction, and in particular relates to a shield path simulation turning construction method for a subway station. Background Art

[0002] As urban traffic pressure continues to increase, more and more subway stations have adopted a fully enclosed roof structure to restore the road as soon as possible to relieve ground traffic pressure. In a closed subway station, after the shield machine exits the tunnel on one line, the shield machine and the supporting trolley are not ready for lifting out, and need to be moved horizontally, turned around and transferred to another line for a second start.

[0003] When analyzing the construction of this type of shield machine turning, its technical difficulties are mainly reflected in the following two aspects: first, the shield machine turning area is a confined space, the construction site is small, the space is limited, and the preliminary preparation work for the shield machine turning is difficult; second, when the shield machine and the supporting trolley turn, the trajectory is difficult to control. The traditional single mode of using an external jack to push the shield machine and the bracket for translation and turning is inefficient and cannot accurately control the direction, which easily causes collisions between the shield machine or the trolley and the side wall, affecting the construction progress and safety. Therefore, how to quickly, efficiently and accurately realize the shield turning in a closed station is a difficult problem that needs to be solved urgently in the field of shield construction. Summary of the invention

[0004] In response to the above-mentioned problems in the prior art, the present application proposes a subway station shield path simulation and U-turn construction method, which combines path simulation with on-site construction optimization, effectively controls the U-turn construction path, greatly improves construction efficiency, and reduces construction safety risks.

[0005] The subway station shield path simulation and U-turn construction method proposed by the present invention comprises the following steps:

[0006] Step 1: Path simulation:

[0007] Use physical simulation software to build a 3D model of the subway station, set multiple constraints on the shield machine and the supporting trolley, and simulate the turning path of the shield machine and the supporting trolley. Then import the 3D model into the test software, add the motion path generated by the simulation, and perform a 3D collision check. Export the constraint position data.

[0008] Step 2: Construction preparation:

[0009] First, transport the required materials to the turning area; level the bottom plate of the turning area; fully lay steel plates in the turning area; make the supporting parts, top irons and limit blocks required for the turning; and stake out the preset positions;

[0010] Step 3: Turn the shield machine around:

[0011] The shield machine is installed on the bracket to separate the shield machine from the supporting trolley; the support is installed based on the simulated shield machine turning path and the derived constraint force position data; a jack is installed between the support and the bracket; the bracket and the shield machine thereon are pushed by the jack to move the shield machine to the target position according to the simulated shield machine turning path;

[0012] Step 4: Rear supporting trolley turns around:

[0013] Make a turning platform and move it to an initial position, which is a side of the U-turn area close to the receiving side platform area; use a battery car of the rear-end trolley to pull a trolley of the rear-end trolley to the U-turn platform and fix it; install a support based on the simulated path of the rear-end trolley and the derived constraint position data; install a jack between the support and the U-turn platform; use the jack to push the U-turn platform to turn around and translate to the side of the U-turn area close to the starting side platform area; unload the battery car and trolley on the U-turn platform to the starting side platform area, and use the battery car to pull the U-turn platform to the initial position; fix the trolleys of the rear-end trolley one by one on the U-turn platform, and use the battery car in the starting side platform area to pull the U-turn platform with the trolley fixed to the starting side platform area until all the trolleys of the rear-end trolleys in the receiving side platform area move to the starting side platform area.

[0014] Furthermore, the step of using physical simulation software to establish a three-dimensional model of the subway station includes:

[0015] The physical simulation software INTERACTIVE PHYS ICS is used to build the models of the side wall, platform, shield machine, rear supporting trolley, turning platform, pulley block, and battery car of the subway station. Multiple restraint forces and monitoring points are set on the shield machine and the rear supporting trolley; the pulley block includes a fixed pulley and a movable pulley, and rope constraints are set between the pulley blocks;

[0016] Furthermore, the step of simulating and generating the turning path of the shield machine includes:

[0017] When the shield machine is in the straight line stage, the two defined constraints are moved to the rear symmetrical position of the shield machine, and the software is started to generate the motion path and time;

[0018] When the shield machine is in the turning stage, the position of one of the restraining forces is kept unchanged, and the pushing position of the other restraining force is changed equidistantly to generate multiple turning motion paths, select the motion path with the largest distance from the side wall, and derive the restraining force position.

[0019] Furthermore, the step of simulating and generating the rear matching trolley path includes:

[0020] The rear-end trolley, the turning platform, the pulley block and the battery car are fixed by the restraining force, the coordinates of the rear-end trolley are preliminarily set, the defined restraining force is added to the battery car, the rear-end trolley is set on the turning platform, the turning platform is towed by the pulley block connected to the battery car, the simulation is started, the coordinates of the rear-end trolley or the pulley block are equidistantly changed, a plurality of turning motion paths of the rear-end trolley are generated, the motion path with the largest distance from the side wall is selected, and the restraining force position is derived.

[0021] Furthermore, the step of performing a three-dimensional collision check includes: optimizing the motion path according to the three-dimensional collision check result until all parts of the shield machine and the rear supporting trolley do not collide with the side walls and the platform, and finally generating and exporting the coordinates and constraint force position data of each stage.

[0022] Furthermore, the step of staking out the preset position includes: exporting the path parameters after simulation and collision check, obtaining the coordinates of the shield machine and the subsequent supporting trolley at each stage, measuring the points with a total station, and marking them on the steel plate.

[0023] Furthermore, the step of using a jack to push the bracket and the shield machine thereon comprises:

[0024] Using a jack disposed at the rear end of the bracket to push the bracket and the shield machine thereon to translate to a preset turning position 1;

[0025] Using the jacks disposed at the rear end and the outer side of the bracket, the bracket and the shield machine thereon are rotated 90° in a clockwise direction;

[0026] Using the jack disposed at the rear end of the bracket to push the bracket and the shield machine thereon to translate to a preset turning position 2;

[0027] Using the jacks disposed at the rear end and the outer side of the bracket, the bracket and the shield machine thereon are rotated 90° in the clockwise direction again;

[0028] The jack disposed at the rear end of the bracket is used to push the bracket and the shield machine thereon to translate to the target position, thereby completing the rotation and U-turn of the shield machine.

[0029] Furthermore, the step of using a jack disposed at the rear end of the bracket to push the bracket and the shield machine thereon to move horizontally comprises:

[0030] The jack is installed between the bracket and the support member, and the jack is fixed to the bracket; the jack retracts after each jacking stroke, and the top iron is supported between the jack and the support member, and this is repeated until the translation of the shield machine is completed.

[0031] Furthermore, the step of using the battery vehicle in the departure side platform area to pull the turning platform with the trolley fixed thereon to move to the departure side platform area includes:

[0032] Based on the simulated path of the rear supporting trolley and the derived constraint force position data, the support, limit block, wire rope, fixed pulley and movable pulley are installed; the support, limit block and fixed pulley are all installed on the side of the U-turn area close to the departure platform area; the movable pulley is installed on the U-turn platform; one end of the wire rope is connected to the battery car, and after passing around the fixed pulley and the movable pulley, the other end is connected to the support;

[0033] Based on the restraint force position data, the position of the movable pulley on the U-turn platform is adjusted, and the U-turn platform is pulled by the battery vehicle to move and rotate 180° in a clockwise direction until the U-turn platform is located at the starting side platform area.

[0034] Furthermore, the turning platform includes a base plate, a plurality of door-shaped brackets arranged on the base plate, and a plurality of rails arranged on the door-shaped brackets; and a plurality of jack slots for installing the jacks are arranged on the base plate.

[0035] The beneficial effects of the present invention include:

[0036] The present invention adopts a variety of methods to realize the turning of the shield machine and the rear supporting trolley according to the resistance difference and path simulation analysis, thereby improving the turning efficiency. The rear supporting trolley uses a pulley block with a special turning platform to turn the shield machine, which has a faster turning speed.

[0037] The present invention uses physical simulation and emulation technology to determine the key positions of each stage of the U-turn in advance. During construction, the shield machine and the supporting trolley are controlled to reach the key positions in sequence by adjusting the jack push or the pulley group traction, so that the U-turn path control is more accurate, the trajectory can be found, and the U-turn process is easier to control.

[0038] The present invention is based on a comprehensive technology combining path simulation and on-site construction optimization. After multiple engineering tests, it can effectively control the turning construction path, greatly improve the construction efficiency and reduce the construction safety risk.

[0039] The present invention utilizes a battery vehicle as power and pulls the trolley to turn around through a pulley system, which greatly shortens the construction time. At the same time, the jacks, turning platforms, jacking irons, supports, limit blocks and other components and steel materials used in the construction method can be circulated and used. During the jacking process, all components are circulated as the positions of the shield machine and the trolley change, with basically no material loss and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a process flow diagram of the construction method of the present invention;

[0041] Figure 2 It is a structural schematic diagram of the prefabricated component of the present invention;

[0042] Figure 3 It is a schematic diagram of the shield machine top-pushing and turning structure of the present invention;

[0043] Figure 4 This is a schematic diagram of the rear supporting trolley traction structure of the present invention.

[0044] Figure 5 It is a schematic diagram of the translation of the shield machine and the bracket of the present invention;

[0045] Figure 6 It is a schematic diagram of the top iron installation of the present invention;

[0046] Figure 7 It is a schematic diagram of the shield machine and bracket turning of the present invention;

[0047] Figure 8 It is a schematic diagram of the translation of the shield machine and the bracket of the present invention;

[0048] Fig. 9 It is a schematic diagram of the shield machine and bracket secondary turning of the present invention;

[0049] Fig.10 It is a schematic diagram of the shield machine and bracket of the present invention being translated to the starting position;

[0050] Fig.11 It is an overall schematic diagram of the U-turn platform of the present invention;

[0051] Fig.12 It is a schematic diagram of the U-turn of the 1# battery car and the 6# trolley and the resetting of the U-turn platform of the present invention;

[0052] Fig.13 This is a schematic diagram of the turning platform and the 5# trolley of the present invention;

[0053] Fig.14 This is a schematic diagram of the translation of the U-turn platform and the 5# trolley of the present invention;

[0054] Fig.15 It is a schematic diagram of the U-turn platform and the secondary turning of the 5# trolley of the present invention.

[0055] In the figure: 11-support; 12-top iron; 121-I-beam; 122-rib plate; 123-connecting plate; 13-limiting block; 14-channel steel top beam; 21-bracket; 30-shield machine; 40-jack; 51-trolley; 52-trolley limiting fixture; 53-turning platform; 54-moving pulley; 55-fixed pulley; 56-wire rope; 531-gantry bracket; 532-channel steel; 533-bottom plate; 534-rail; 535-jack slot; 536-reserved circular hole; 61-side wall; 62-originating side platform area; 63-receiving side platform area; 64-turning area. DETAILED DESCRIPTION

[0056] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] like Figure 1 The subway station shield path simulation turning construction method shown is mainly used to solve the problems of difficult preparatory work for turning the shield machine in the prior art and difficult trajectory control when the shield machine and the subsequent supporting trolley turn. The method of this case includes the following steps:

[0058] Step 1: Path simulation:

[0059] A three-dimensional model of the subway station is established using physical simulation software, multiple constraints are set on the shield machine 30 and the supporting trolley, and the turning path of the shield machine 30 and the supporting trolley are simulated and generated; then the three-dimensional model is imported into the test software, the motion path generated by the simulation is added, and a three-dimensional collision check is performed; and the constraint position data is exported;

[0060] Step 2: Construction preparation:

[0061] First, the required materials are transported to the turning area 64; the bottom plate of the turning area 64 is leveled; the turning area 64 is fully covered with steel plates; the prefabricated components required for the turning are manufactured, and the prefabricated components include support members 11, top irons 12 and limit blocks 13; and the preset positions are laid out;

[0062] Step 3: Turn the shield machine 30 around:

[0063] Install the shield machine 30 on the bracket 21 to separate the shield machine 30 from the subsequent supporting trolley; install the support 11 based on the simulated turning path of the shield machine 30 and the derived constraint force position data; install the jack 40 between the support 11 and the bracket 21; use the jack 40 to push the bracket 21 and the shield machine 30 thereon to move the shield machine 30 to the target position according to the simulated turning path of the shield machine 30; wherein, the target position of the shield machine 30 is the starting position after the shield machine 30 completes the turning.

[0064] Step 4: Rear supporting trolley turns around:

[0065] Make a U-turn platform 53 and move it to the initial position, which is the side of the U-turn area 64 close to the receiving side platform area 63; use a battery car of the rear supporting trolley to pull a trolley of the rear supporting trolley to the U-turn platform 53 and fix it; install the support 11 based on the simulated rear supporting trolley path and the derived constraint force position data; install the jack 40 between the support 11 and the U-turn platform 53; use the jack 40 to push the U-turn platform 53 to turn around and translate to the U-turn area 64 is close to the side of the departure side platform area 62; unload the battery car and the trolley 51 on the turning platform 53 to the departure side platform area 62, and use the battery car to pull the turning platform 53 to the initial position; fix the trolleys of the subsequent trolleys on the turning platform 53 one by one, and use the battery car in the departure side platform area 62 to pull the turning platform 53 with the trolleys fixed to the departure side platform area 62, until all the trolleys 51 of the subsequent trolleys in the receiving side platform area 63 move to the departure side platform area 62.

[0066] like Figure 1-Figure 15 As shown, the method of the present invention specifically comprises:

[0067] Step 1: The specific execution process of path simulation is as follows:

[0068] The physical simulation software INTERACTIVE PHYSICS is used to establish models of the side wall 61, the platform, the shield machine 30, the rear supporting trolley, the turning platform 53, the pulley block, the battery car, etc., and the restraint force and monitoring points are set on the main machine of the shield machine 30 and the rear supporting trolley, and the rope restraint is set between the pulleys;

[0069] When the shield machine 30 is located in a straight line segment, the defined constraint force is moved to the symmetrical position of the tail of the shield machine 30, and the software is started to generate a U-turn path and time. During the turning process, the position of one of the forces is kept unchanged, and the pushing position of the other force is changed equidistantly to generate multiple U-turn motion paths. The motion path with the largest distance from the side wall 61 is selected to derive the position information;

[0070] Fix the rear supporting trolley, the turning platform 53, the pulley block, and the battery car through constraints, preliminarily set the coordinates of the rear supporting trolley, add the defined constraint force to the battery car, start the simulation, change the coordinates of the rear supporting trolley or the fixed pulley 55 coordinates equidistantly (i.e. keep one variable), generate multiple trolley turning motion paths, select the motion path with the largest distance from the side wall 61 (platform), and derive the position information;

[0071] The 3D model is imported into NAVISWORKS, and the motion path generated by the above simulation is added to perform a 3D collision check. Based on the results, the turning path is optimized until all parts of the shield machine 30 and the trolley do not collide with the side wall 61, the platform, and the upper flip beam. Finally, the coordinates of each stage of the turning and the position data of the restraining force are generated.

[0072] Step 2: Construction preparation The specific implementation process is as follows:

[0073] Through the reserved holes in the standard section of the station structure, lift the forklift, hoist, rails, steel plates, profiles, cement and other materials down the shaft, use the forklift to move the hoist to the U-turn area 64 and fix it, lay temporary tracks along the line direction, and make a simple transfer trolley on the track with steel pipes and steel plates. Open a hole at the front end of the steel plate to fix the steel wire rope 56, and the other end is connected to the hoist. All other materials are placed on the steel plate and transported to the U-turn area 64 with the steel plate;

[0074] The elevation of the U-turn area 64 is collected, and mortar is evenly laid at locations where the local height difference exceeds 1 cm. The mortar is made by mixing bagged cement and fine sand on site. After the mortar solidifies, it is measured and checked to ensure the flatness of the mortar laying;

[0075] Drill 25mm round holes every 1m at the boundary of the U-turn area 64 with an electric drill, implant Φ22 steel bars after cleaning the holes, fix the hand chain hoist on the steel bars, and manually place the steel plates along the boundary of the area. The joints between the steel plates are welded firmly, with a weld length of 30cm and a spacing of 1m, and the surface is polished;

[0076] The prefabricated components required for making the U-turn are at least comprised of a support 11, a top iron 12 and a limit block 13. The top iron 12 comprises an I-beam 121, a rib 122 connected to the web of the I-beam 121 and a connection block connected to one end of the I-beam 121. The connection block comprises two connection plates 123 clamped at both ends of the I-beam 121. The connection plates 123 are provided with grooves for placing the channel steel top beam 14. Bolt holes are provided on the connection plates 123, and bolt holes are also provided at both ends of the I-beam 121. One end of the I-beam 121 is connected to a connection block by a high-strength bolt. When adjacent top irons 12 are butt-jointed, the two connection plates 123 of the connection block of one top iron 12 are clamped at one end of the other top iron 12 and connected by high-strength bolts.

[0077] The path parameters after simulation and collision check are exported to obtain the coordinates of the shield machine 30 and the trolley at each stage, and the points are measured with a total station and marked on the steel plate;

[0078] Step 3: Turn the shield machine 30:

[0079] According to the height difference between the starting and receiving side bottom plates after leveling and combined with the starting posture of the shield machine 30, determine the height of the bracket 21 (taking 10cm as an example), lay the bottom steel plate of the bracket 21 flat at the receiving position, and apply butter on the bottom. The joints between the steel plates are welded firmly and polished flat. After assembly, grind the grooves around the steel plates. The bracket 21 is raised by stacking and welding steel plate pads layer by layer. The steel plate pads are laid flat on the bottom steel plate of the bracket 21. The lower pads are 2cm longer than the upper pads on one side. The top pads should extend out of the guide rail plate and the support beam of the bracket 21 by at least 2cm. The pads are arranged longitudinally at the lower end of the guide rail plate of the bracket 21, and the transverse arrangement position is at the lower end of the support beam. The pad spacing is set to 20cm. After paving, triangle welding is used along the four sides to firmly connect the bottom steel plate and pads of the bracket 21.

[0080] Measure and stake out to determine the exit position of the shield machine 30, adjust the bracket 21 to coincide with the position, weld triangular steel plates on both sides of the bracket 21, drill holes around the triangular steel plates and plant reinforcement, weld the steel bars to the triangular plates firmly, drill holes at the position where the front end of the bracket 21 is fully covered with steel plates and plant reinforcement, plug weld the steel bars to the steel plates, cut and grind the steel bars protruding from the steel plates, and ensure that the top surface of the steel plates is smooth and flat;

[0081] After the cutterhead of the shield machine 30 breaks through the end wall, it is pushed onto the bracket 21, and the shield machine 30 and the bracket 21 are welded to form a whole with channel steel;

[0082] A carriage is reserved under the connecting bridge, and a support is made of steel on the carriage to keep the front end of the connecting bridge and the shield machine 30 in the same relative position, and finally the travel control pin between the connecting bridge and the shield machine 30 is removed;

[0083] like Figure 5 , weld the support 11 at the positions a and b determined by measurement and setting out, select two 100t jacks 40, place them between the support 11 and the bracket 21, then start the jack 40 to start pushing the bracket 21, when the jack 40 is pushed to the maximum stroke, retract the cylinder, put the top iron 12 between the jack 40 and the support 11 (the top iron 12 is installed by high-strength bolts, and the channel steel top beam 14 is placed in the grooves on the upper parts of the two parallel top irons 12), and then continue to push, repeat the above steps until the whole formed by the welding of the shield machine 30 and the bracket 21 is pushed and translated to the preset turning position 1; wherein, Figure 5 The right side of the shield machine 30 shown, that is, the end of the shield machine 30 facing the jack 40, is the rear end of the shield machine 30, and the front end is the end with the cutterhead. When the shield machine 30 is in the starting position, positions a and b are located at the rear end of the shield machine 30.

[0084] like Figure 7, weld the reaction frames at the positions c, d, e, and f determined by measurement and setting out, transfer the jacks 40 to the front end of the support member 11 at the positions c and d, start the jacks 40 to push the bracket 21, form a rotation torque, and make the shield machine 30 and the bracket 21 move along the predetermined trajectory to complete a 45° turn inward, transfer the jacks 40 at the positions c and d to the positions e and f, start the jacks 40, and make the shield machine 30 and the bracket 21 rotate inward again by 45° to complete a 90° turn; wherein, as Figure 5 , Figure 7 As shown, after the shield machine 30 moves to the preset turning position 1, position c is located at the rear end of the shield machine 30 at this time, and is close to the outside of the shield machine 30; position d is located at the outside of the shield machine 30 at this time, and is close to the front end of the shield machine 30; when the shield machine 30 rotates inward by 45°, mark the two stress points where the bracket 21 and the jacks 40 at positions c and d are subjected to stress, remove the jacks 40 at positions c and d, and transfer them to positions e and f. The stress point where the bracket 21 contacts the jack 40 at position c corresponds to the jack 40 at position e, and the stress point where the bracket 21 contacts the jack 40 at position d corresponds to the jack 40 at position f, that is, position e is located at the rear end of the shield machine 30 at this time, and is close to the outside of the shield machine 30, and position f is located at the outside of the shield machine 30 at this time, and is close to the front end of the shield machine 30. At the same time, the jacks 40 at positions e and f are started to rotate the shield machine 30 and the bracket 21 inwards by 45° again, and finally the shield machine 30 and the bracket 21 complete a 90° turn in the clockwise direction.

[0085] like Figure 8 , weld the support member 11 at the position d and g determined by measurement and setting out, transfer the jack to the position between the front end of the support member 11 at the position d and g and the bracket 21 under the shield machine 30, and according to the above-mentioned translation method, retract the jack 40 after each jacking to the maximum stroke, so that there is a gap at the end of the jack 40 facing away from the bracket 21, and put a section of jacking iron 12 in the gap until the jacking bracket 21 and the shield machine 30 reach the preset turning position 2. Positions d and g are located at the rear end of the shield machine 30. The subway station has two parallel lines, of which the first line passes through the preset turning position 1 in the subway station, and the second line passes through the preset turning position 2 in the subway station.

[0086] like Fig. 9 , weld the support members 11 at the positions i, h, j, and k determined by measurement and layout, transfer the jack 40 to the front end of the support member 11 at the i and h positions, start the jack 40 to push the bracket 21, so that the shield machine 30 and the bracket 21 complete a 45° turn, transfer the jack 40 at the i and h positions to the j and k positions, start the jack 40, and rotate the shield machine 30 and the bracket 21 inward again by 45° to complete the turn.

[0087] After the shield machine 30 moves to the preset turning position 2, position h is located at the rear end of the shield machine 30 at this time and close to the outside of the shield machine 30; position i is located at the outside of the shield machine 30 at this time and close to the front end of the shield machine 30; when the shield machine 30 moves inward (i.e. Fig. 9 After rotating 45° clockwise (as shown in the figure), the jacks 40 at positions i and h are removed and transferred to positions k and j. Positions k and j are located at the rear end of the shield machine 30 at this time, wherein position k is close to the outside of the shield machine 30, and position j is close to the inside of the shield machine 30. The jacking stroke of the jack 40 at position k is greater than the jacking stroke of the jack 40 at position j, so that the shield machine 30 and the bracket 21 are pushed inward, i.e. Fig. 9 The shield machine 30 and the bracket 21 are rotated 45° in the clockwise direction to complete the 90° turn in the clockwise direction. Figure 5 For the shield machine 30 shown in the preset turning position 1, after the rotation is completed Fig. 9 The head (front end) and tail (rear end) of the shield machine 30 shown are inverted, and the shield machine 30 rotates 180° in a clockwise direction. Of course, the shield machine 30 at this time has only completed a U-turn and has not yet moved to the starting position of the second route.

[0088] like Fig.10 , weld the support 11 at the positions l and m determined by measurement and setting out, transfer the jack 40 to between the support 11 and the bracket 21 at the positions l and m, and put a section of top iron 12 between the jack 40 and the support 11 each time the jack 40 pushes, until the push bracket 21 and the shield machine 30 are translated to the starting position; the positions l and m are located at the rear end of the shield machine 30. The above positions a to m are determined by the position information derived when NAVISWORKS simulates and generates the turning path of the shield machine 30.

[0089] Step 4: The specific process of turning the battery car and the trolley is as follows:

[0090] The bottom plate 533 of the turning platform 53 is made of 2 cm thick steel plates, and the bottom surface of the bottom plate 533 is grinded with grooves around. A plurality of door-shaped brackets 531 are made of 200H steel, and the plurality of door-shaped brackets 531 are firmly connected with channel steel parts 532. A slot 535 for the jack 40 is welded at a designed position on the bottom plate 533, and a circular hole 536 is reserved on the slot wall. A plurality of steel rails 534 are installed on the upper part of the door-shaped bracket 531 to form a track of the turning platform 53. The track of the turning platform 53 is connected and fixed to the external track through a track connecting plate 123.

[0091] Weld three support members 11 at the determined positions, with round holes reserved on the support members 11 for hanging a 10t pulley and fixing a steel wire rope 56;

[0092] Tracks are laid in the departure side platform area 62, the receiving side platform area 63 and the U-turn area 64. The track is the external track mentioned above, and the supporting trolley is moved to the receiving side platform area 63 by traction of the 1# battery car;

[0093] Use steel to make stirrups and weld them to the end of the connecting bridge as support, so that the relative position between the connecting bridge and the No. 1 trolley remains unchanged, and remove the connecting pins between each section of the trolley;

[0094] Use the 1# battery car to pull the 6# trolley onto the U-turn platform 53, and lock and fix the wheels of the 1# battery car and the 6# trolley on the track of the U-turn platform 53 through the trolley limit fixing device 52;

[0095] First, use the 1# battery car to pull the rear supporting trolley from the initial position of the first line of the subway station to the receiving side platform area 63, and use the 1# battery car to pull the 6# trolley of the rear supporting trolley near the U-turn area 64 to the U-turn platform 53; by changing the position of the jack 40 and adjusting the cylinder stroke difference, the U-turn trolley is translated and turned, and the U-turn platform 53 track that has completed the U-turn is connected to the track of the starting side platform area 62, and the 6# trolley is pulled to the starting side platform area 62 by the 1# battery car and then separated, and then the U-turn platform 53 is translated horizontally to the initial position through the pulley system connected to the 1# battery car. In this embodiment, Fig.12 The position of the turning platform 53 pushed by the two jacks 40 is the initial position, which is Figure 5 The shield machine 30 shown in the figure shows a preset turning position 1 in the U-turn construction method. The left side of the initial position is the receiving side platform area 63. Fig.12 The middle 1# battery car is located at the departure side platform area 62 and is pulled by the pulley system to move the turning platform 53 to the initial position.

[0096] Specifically, the connecting plate 123 between the track of the turning platform 53 and the external track is removed, the hydraulic jack 40 is placed in the jack 40 slot of the turning platform 53, the support member 11 is welded at a predetermined position, and the translational turning is performed by changing the position of the jack 40 and adjusting the cylinder stroke difference. The construction method is basically the same as the turning construction method of the shield machine 30. After the turning is completed, the track of the turning platform 53 is connected to the track of the starting side platform area 62, and the 6# trolley is towed to the starting side platform area 62 by the 1# battery car, and the track connecting plate 123 between the turning platform 53 and the starting side platform area 62 is removed, and the wire rope 56 is inserted into the pulley system. The pulley system includes a pulley block, and the pulley block includes a fixed pulley 55 and a movable pulley 54. A support member 11 is arranged on one side of the fixed pulley 55, and the fixed pulley 55 and the support member 11 are both located at one end of the starting side platform area 62. A movable pulley 54 is arranged on one side of the turning platform 53 close to the fixed pulley 55. The movable pulley 54 is connected to the reserved circular holes of the jack 40 slots at both ends of the turning platform 53 through a steel wire rope 56. One end of the steel wire rope 56 in the pulley system is fixed on the 1# battery car, and the other end is fixed on the support 11. Start the 1# battery car and translate the turning platform 53 horizontally to the initial position.

[0097] Connect the track of the U-turn platform 53 to the track of the receiving side platform area 63, use the 2# battery car to pull the 5# trolley to the U-turn platform 53, and use the trolley limit fixing device 52 to fix the 5# trolley on the U-turn platform 53;

[0098] like Fig.13 , remove the connecting plate 123 between the turning platform 53 track and the platform area track, hang the movable pulley 54 at the slot position of the turning platform 53 near the corner of the 4# trolley and the fixed pulley 55, put the wire rope 56 into the pulley block, one end of the wire rope 56 is connected to the tail of the 1# battery car, and the other end is connected to the support 11, start the 1# battery car to drag the turning platform 53 and the 5# trolley to complete the turn, and arrive Fig.13 The preset turning position 3 is shown;

[0099] like Fig.14 , transfer the movable pulley 54 at the slot on the right side of one end of the U-turn platform 53 to the slot on the left side of the same end, connect the wire rope 56, start the 1# battery car, and drag the U-turn platform 53 and the 5# trolley to Fig.14 The preset turning position 4 is shown;

[0100] like Fig.15 , move the movable pulley 54 at the slot to the side of the U-turn platform 53 close to the fixed pulley 55, connect the movable pulley 54 with the slot of the U-turn platform 53 with the wire rope 56, start the 1# battery car, drag the 5# trolley and the U-turn platform 53 to turn, and finally use the jack 40 to make fine adjustments to align the track of the U-turn platform 53 with the track of the departure side platform area 62;

[0101] Connect the turning platform 53 track to the departure side platform area 62 track, use the 1# battery car to pull the 5# car to the platform area, and then use the same method as above to translate the turning platform 53 back to the initial position;

[0102] The remaining supporting trolleys will complete the U-turn in the order of 4#, 3#, 2#, 1#, and connecting bridge, which is the same as the U-turn process of the 5# trolley mentioned above;

[0103] Connect the latches between all the trolleys and the connecting bridges, and finally connect the connecting bridge to the shield machine 30, connect all pipelines, and complete the turning of the shield machine 30 and the subsequent supporting trolleys.

[0104] It should be noted that after the bottom plate is fully paved with steel plates, the height difference of adjacent steel plate surfaces shall not exceed ±2mm. Before the bracket 21 is modified, the support 11, the top iron 12 and the turning platform 53 are welded, the rust, moisture, oil and other stains on the weld surface shall be cleaned up, and the weld grade of the welding operation shall reach Level 2. The bracket 21 is modified, the support 11, the top iron 12 and the turning platform 53 are subjected to force verification, and their feasibility is determined by a qualified unit. The bevel grinding of the bottom steel plate of the bracket 21 and the base steel plate of the turning platform 53 should not be too thick and should be controlled within 5mm. The horizontal positioning deviation of the limit block 13 and the support 11 shall not exceed 1cm. The steel plate should be kept clean before installation. A trial jacking should be carried out before the shield machine 30 and the trolley are turned to ensure the reliability of the jack 40 and the pulley block. The pulley block and the wire rope 56 should be matched, and the ratio of the wheel diameter to the rope diameter should not be less than 16-28. The jack 40 must be set with an oil pressure alarm value to prevent overloading during the pushing process. During the turning process, the stroke and arrival position of the jack 40 are strictly controlled according to the position determined by the simulation, and a safety distance of more than 25 cm is guaranteed from the surrounding structures.

[0105] The above are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A subway station shield path simulation U-turn construction method, characterized in that: The following steps are involved: Step 1: Path simulation: Use physical simulation software to build a 3D model of the subway station, set multiple constraints on the shield machine and the supporting trolley, and simulate the turning path of the shield machine and the supporting trolley. Then import the 3D model into the test software, add the motion path generated by the above simulation, and perform 3D collision check; export the constraint force position data; Step 2: Construction preparation: First, transport the required materials to the turning area; level the bottom plate of the turning area; fully lay steel plates in the turning area; make the supporting parts, top irons and limit blocks required for the turning; and stake out the preset positions; Step 3: Turn the shield machine around: The shield machine is installed on the bracket to separate the shield machine from the supporting trolley; the support is installed based on the simulated shield machine turning path and the derived constraint force position data; a jack is installed between the support and the bracket; the bracket and the shield machine thereon are pushed by the jack to move the shield machine to the target position according to the simulated shield machine turning path; Step 4: Rear supporting trolley turns around: Make a turning platform and move it to an initial position, which is a side of the U-turn area close to the receiving side platform area; use a battery car of the rear-end trolley to pull a trolley of the rear-end trolley to the U-turn platform and fix it; install a support based on the simulated path of the rear-end trolley and the derived constraint position data; install a jack between the support and the U-turn platform; use the jack to push the U-turn platform to turn around and translate to the side of the U-turn area close to the starting side platform area; unload the battery car and trolley on the U-turn platform to the starting side platform area, and use the battery car to pull the U-turn platform to the initial position; fix the trolleys of the rear-end trolley one by one on the U-turn platform, and use the battery car in the starting side platform area to pull the U-turn platform with the trolley fixed to the starting side platform area until all the trolleys of the rear-end trolleys in the receiving side platform area move to the starting side platform area.

2. The method for simulating the turning of a subway station shield path according to claim 1 is characterized in that: The step of using physical simulation software to establish a three-dimensional model of a subway station comprises: The physical simulation software INTERACTIVE PHYSICS is used to build models of the side wall, platform, shield machine, rear supporting trolley, turning platform, pulley block, and battery car of the subway station. Multiple restraints and monitoring points are set on the shield machine and the rear supporting trolley; the pulley block includes a fixed pulley and a movable pulley, and rope constraints are set between the pulley blocks.

3. The method for simulating the turning of a subway station shield path according to claim 2 is characterized in that: The steps of simulating and generating the turning path of the shield machine include: When the shield machine is in the straight line stage, the two defined constraints are moved to the rear symmetrical position of the shield machine, and the software is started to generate the motion path and time; When the shield machine is in the turning stage, the position of one of the restraining forces is kept unchanged, and the pushing position of the other restraining force is changed equidistantly to generate multiple turning motion paths, select the motion path with the largest distance from the side wall, and derive the restraining force position.

4. The method for simulating the turning of a subway station shield path according to claim 2 is characterized in that: The steps of simulating and generating the rear matching trolley path include: The rear-end trolley, the turning platform, the pulley block and the battery car are fixed by the restraining force, the coordinates of the rear-end trolley are preliminarily set, the defined restraining force is added to the battery car, the rear-end trolley is set on the turning platform, the turning platform is towed by the pulley block connected to the battery car, the simulation is started, the coordinates of the rear-end trolley or the pulley block are equidistantly changed, a plurality of turning motion paths of the rear-end trolley are generated, the motion path with the largest distance from the side wall is selected, and the restraining force position is derived.

5. The method for simulating the turning of a subway station shield path according to claim 2 is characterized in that: The steps of performing three-dimensional collision check include: optimizing the motion path according to the three-dimensional collision check results until all parts of the shield machine and the rear supporting trolley do not collide with the side walls and the platform, and finally generating and exporting the coordinates and constraint force position data of each stage.

6. The method for simulating U-turn construction of a subway station shield path according to claim 1 is characterized in that: The step of setting out the preset position includes: exporting the path parameters after simulation and collision check, obtaining the coordinates of the shield machine and the subsequent supporting trolley at each stage, measuring the points with a total station, and marking them on the steel plate.

7. The method for simulating U-turn of a subway station shield path according to claim 1 is characterized in that: The step of using a jack to push the bracket and the shield machine thereon comprises: Using a jack disposed at the rear end of the bracket to push the bracket and the shield machine thereon to translate to a preset turning position 1; Using the jacks disposed at the rear end and the outer side of the bracket, the bracket and the shield machine thereon are rotated 90° in a clockwise direction; Using the jack disposed at the rear end of the bracket to push the bracket and the shield machine thereon to translate to a preset turning position 2; Using the jacks disposed at the rear end and the outer side of the bracket, the bracket and the shield machine thereon are rotated 90° in the clockwise direction again; The jack disposed at the rear end of the bracket is used to push the bracket and the shield machine thereon to translate to the target position, thereby completing the rotation and U-turn of the shield machine.

8. The method for simulating the turning of a subway station shield path according to claim 7 is characterized in that: The step of using a jack disposed at the rear end of the bracket to push the bracket and the shield machine thereon to translate comprises: The jack is installed between the bracket and the support member, and the jack is fixed to the bracket; the jack retracts after each jacking stroke, and the top iron is supported between the jack and the support member, and this is repeated until the translation of the shield machine is completed.

9. The method for simulating U-turn of a subway station shield tunneling path according to claim 1, characterized in that: The step of using the battery vehicle in the originating side platform area to pull the turning platform with the trolley fixed thereon to move to the originating side platform area comprises: Based on the simulated path of the rear supporting trolley and the derived constraint force position data, the support, limit block, wire rope, fixed pulley and movable pulley are installed; the support, limit block and fixed pulley are all installed on the side of the U-turn area close to the departure platform area; the movable pulley is installed on the U-turn platform; one end of the wire rope is connected to the battery car, and after passing around the fixed pulley and the movable pulley, the other end is connected to the support; Based on the restraint force position data, the position of the movable pulley on the U-turn platform is adjusted, and the U-turn platform is pulled by the battery vehicle to move and rotate 180° in a clockwise direction until the U-turn platform is located at the starting side platform area.

10. The method for simulating U-turn of a subway station shield tunneling path according to claim 1, characterized in that: The turning platform comprises a bottom plate, a plurality of door-shaped brackets arranged on the bottom plate, and a plurality of rails arranged on the door-shaped brackets; the bottom plate is provided with a plurality of jack slots for installing the jacks.

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